CN219696560U

CN219696560U - Hexagonal prism battery and battery pack

Info

Publication number: CN219696560U
Application number: CN202320963822.4U
Authority: CN
Inventors: 赵冬
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-04-25
Filing date: 2023-04-25
Publication date: 2023-09-15
Anticipated expiration: 2033-04-25

Abstract

The utility model relates to the technical field of batteries and discloses a hexagonal prism battery and a battery pack; the hexagonal-prism battery may include a battery case and a winding core; the battery shell is of a hexagonal prism structure and is provided with two oppositely arranged shell end faces, and the shell end faces are of a hexagon; the roll core is arranged in the battery shell and comprises a roll core main body, the roll core main body is provided with a main body end face, the main body end face and the shell end face are oppositely arranged, and the ratio of the area of the main body end face to the area of the shell end face is more than or equal to 0.31 and less than or equal to 0.92. The hexagonal-prism battery not only can ensure that the space for storing gas and electrolyte in the battery shell is enough, but also can ensure the charge and discharge rate of the hexagonal-prism battery and the infiltration space of the electrolyte; and the energy density of the hexagonal-prism battery can be ensured, so that the heat generated by the winding core is quickly transferred out through the battery shell, and the safety risk cannot be caused, so that the comprehensive performance of the hexagonal-prism battery is improved.

Description

Hexagonal prism battery and battery pack

Technical Field

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

Background

The lithium ion battery with the advantages of high energy density, long cycle life, green pollution-free and the like has become one of the necessary choices of future industry.

However, the overall performance of the current battery needs to be further improved.

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 disclosure aims to overcome the defect that the comprehensive performance of the related art needs to be further improved, and provides a hexagonal-prism battery with good comprehensive performance and a battery pack comprising the hexagonal-prism battery.

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

the battery shell is provided with two oppositely arranged shell end faces, and the shell end faces are arranged in a hexagonal shape;

the roll core is arranged in the battery shell, the roll core comprises a roll core main body, the roll core main body is provided with a main body end face, the main body end face is opposite to the shell end face, and the ratio of the area of the main body end face to the area of the shell end face is more than or equal to 0.31 and less than or equal to 0.92.

According to the hexagonal-prism battery disclosed by the utility model, the ratio of the area of the end face of the main body to the area of the end face of the shell is more than or equal to 0.31 and less than or equal to 0.92, so that the space for storing gas and electrolyte in the battery shell is enough, and the charge and discharge rate of the hexagonal-prism battery and the infiltration space of the electrolyte are ensured; and the energy density of the hexagonal-prism battery can be ensured, so that the heat generated by the winding core is quickly transferred out through the battery shell, and the safety risk cannot be caused, so that the comprehensive performance of the hexagonal-prism battery is improved.

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

a battery box;

the hexagonal prism battery is arranged in the battery box, at least two hexagonal prism batteries are arranged, and the hexagonal prism battery is the hexagonal prism battery.

According to the battery pack disclosed by the utility model, on one hand, the ratio of the area of the end face of the main body to the area of the end face of the shell is more than or equal to 0.31 and less than or equal to 0.92, so that the space for storing gas and electrolyte in the battery shell is enough, and the charge and discharge rate of the hexagonal-prism battery and the battery pack and the infiltration space of the electrolyte are ensured; and can guarantee the energy density of hexagonal prism battery and battery package for the heat that the core produced is faster to be transmitted away through the battery casing, can not initiate the security risk, in order to improve the comprehensive properties of hexagonal prism battery and battery package. On the other hand, two adjacent hexagonal prism batteries can be closely attached to improve the energy density 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 perspective view of an exemplary embodiment of a hexagonal-prism battery of the present disclosure.

Fig. 2 is an axial sectional view schematically illustrating the hexagonal-prism battery of fig. 1.

Fig. 3 is a schematic top view of the hexagonal-prism battery of fig. 1.

Fig. 4 is a schematic top view of another example embodiment of a hexagonal-prism battery of the present disclosure.

Fig. 5 is a schematic perspective view of an exemplary embodiment of a battery pack of the present disclosure.

Reference numerals illustrate:

1. a battery case; 11. a housing end face; 12. an end plate; 13. a side plate; 14. a connection part;

2. a winding core; 21. a winding core main body; 211. a main body end face; 2111. a first end face; 2112. a second end face; 22. a tab portion; 221. a first tab; 222. a second lug;

3. a battery post; 4. a collecting tray;

10. a hexagonal-prism-shaped battery;

20. a battery box; 201. a first side frame; 202. and a second side frame.

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 utility model, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, 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.

The present disclosure provides a hexagonal-prism-shaped battery 10, and referring to fig. 1 to 4, the hexagonal-prism-shaped battery 10 may include a battery case 1 and a jelly roll 2; the battery shell 1 is arranged into a hexagonal prism structure, the battery shell 1 is provided with two oppositely arranged shell end faces 11, and the shell end faces 11 are arranged into a hexagon; the winding core 2 is disposed in the battery case 1, and the winding core 2 may include a winding core main body 21, the winding core main body 21 having a main body end surface 211, the main body end surface 211 being disposed opposite to the case end surface 11, and a ratio of an area of the main body end surface 211 to an area of the case end surface 11 being equal to or greater than 0.31 and equal to or less than 0.92.

The hexagonal-prism battery 10 disclosed by the utility model not only can ensure that the space for storing gas and electrolyte in the battery shell 1 is enough, but also can ensure the charge and discharge rate of the hexagonal-prism battery 10 and the infiltration space of the electrolyte; and can guarantee hexagonal prism battery 10's energy density for the heat that core 2 produced is faster to be transmitted away through battery case 1, can not initiate the security risk, in order to improve hexagonal prism battery 10's comprehensive properties.

In the present exemplary embodiment, the ratio of the area S1 of the body end surface 211 to the area S2 of the case end surface 11 is 0.31 or more and 0.92 or less, for example, the ratio of the area S1 of the body end surface 211 to the area S2 of the case end surface 11 may be 0.33, 0.35, 0.38, 0.4, 0.42, 0.45, 0.47, 0.5, 0.53, 0.55, 0.58, 0.6, 0.62, 0.65, 0.67, 0.7, 0.73, 0.75, 0.78, 0.8, 0.82, 0.85, 0.87, 0.9, or the like.

If the ratio of the area S1 of the main body end surface 211 to the area S2 of the case end surface 11 is too large, the volume of the winding core 2 occupying the accommodating cavity of the battery case 1 is too large, resulting in insufficient space for storing gas and electrolyte inside the battery case 1; the charge and discharge rate of the hexagonal-prism-shaped battery 10 and the infiltration space of the electrolyte are affected.

If the ratio of the area S1 of the body end surface 211 to the area S2 of the case end surface 11 is too small, so that the volume of the winding core 2 occupying the accommodation chamber of the battery case 1 is too small, resulting in a larger distance of the gap between the winding core 2 and the battery case 1, resulting in a relatively low energy density of the hexagonal-prism battery 10; the heat generated by the winding core 2 needs to be transferred through the battery shell 1, so that a heat transfer path between the winding core 2 and the battery shell 1 is long, the heat dissipation of the winding core 2 is difficult, and the heat dissipation of the hexagonal-prism battery 10 is difficult; especially, the hexagonal battery 10 having a larger difference between the outer shape of the winding core 2 and the outer shape of the battery case 1 has a smaller contact area between the winding core 2 and the battery case 1, which further results in a more difficult heat dissipation of the winding core 2, and a more difficult heat dissipation of the hexagonal battery 10, and a safety risk is easily caused inside the hexagonal battery 10.

The ratio range can ensure that the space for storing gas and electrolyte in the battery shell 1 is enough, and ensure the charge and discharge rate of the hexagonal prism battery 10 and the infiltration space of the electrolyte; and can guarantee hexagonal prism battery 10's energy density for the heat that core 2 produced is faster to be transmitted away through battery case 1, can not cause the security risk.

Specifically, referring to fig. 1 and 2, the battery case 1 may include two end plates 12 and six side plates 13, the two end plates 12 may be provided as regular hexagonal plates, the six side plates 13 may be provided as rectangular plates, and the six side plates 13 may be identical. Six curb plates 13 connect gradually as regular hexagonal prism tube-shape end to end, have the settlement angle between two adjacent curb plates 13, the settlement angle is about 120. One end plate 12 is connected to one end of the six side plates 13, and the other end plate 12 is connected to the opposite ends of the six side plates 13 such that the two end plates 12 are disposed opposite to each other. The battery shell 1 can be arranged into a regular hexagonal prism, so that the adjacent hexagonal prism batteries 10 can be well attached after the subsequent hexagonal prism batteries 10 are grouped.

The faces of the two end plates 12 facing away from the side plates 13 are both case end faces 11, so that the battery case 1 has two oppositely disposed case end faces 11, the case end faces 11 are arranged in a hexagonal shape, and specifically, the case end faces 11 may be arranged in a regular hexagonal shape.

The side length of the end plate 12 is substantially the same as the side length of the side plate 13 to which the end plate 12 is connected.

Of course, in some example embodiments of the present disclosure, the two end plates 12 may be provided as non-regular hexagonal plates, in which case the six side plates 13 may be different, mainly the side lengths of the sides of the six side plates 13 and the end plate 12 connected are different, but the heights of the six side plates 13 are the same, and the heights of the side plates 13 are provided perpendicularly to the case end face 11.

Further, as shown in FIG. 3, the thickness K of the side plate 13 is 0.3mm or more and 1mm or less, for example, the thickness of the side plate 13 may be 0.32mm, 0.35mm, 0.37mm, 0.4mm, 0.43mm, 0.45mm, 0.48mm, 0.5mm, 0.52mm, 0.55mm, 0.57mm, 0.6mm, 0.63mm, 0.65mm, 0.68mm, 0.7mm, 0.72mm, 0.75mm, 0.77mm, 0.8mm, 0.83mm, 0.85mm, 0.88mm, 0.9mm, 0.92mm, 0.95mm, 0.97mm, or the like.

If the thickness of the side plate 13 is too thick, so that the volume and weight of the battery case 1 are large, the energy density of the hexagonal-prism battery 10 is reduced; after the hexagonal prism batteries 10 are grouped, the internal space of the battery box 20 is occupied greatly, and the energy density of the battery pack is reduced; in addition, when the battery case 1 is formed by bending or punching and bending a metal plate, the battery case 1 is not easily molded.

If the thickness of the side plate 13 is too thin, so that the strength of the battery case 1 is small, the winding core 2 in the battery case 1 cannot be protected.

The range of the thickness of the side plate 13 can ensure the energy density of the hexagonal-prism battery 10 and the battery pack; but also can protect the winding core 2; and the battery shell 1 is easier to form, so that the process difficulty is reduced.

Further, referring to fig. 3, the ratio of the thickness K of the side plate 13 to the side length L of the case end face 11 is 0.7% or more and 5% or less, which is to say that the ratio of the thickness of the side plate 13 to the side length of the side plate 13 connected to the end plate 12 is 0.7% or more and 5% or less, for example, the ratio of the thickness of the side plate 13 to the side length of the case end face 11 may be 1%, 1.2%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.7%, 4%, 4.3%, 4.5%, 4.8%, or the like.

If the ratio of the thickness of the side plate 13 to the side length of the housing end face 11 is too small, the thickness of the side plate 13 is too small or the side length of the housing end face 11 is too large, or the thickness of the side plate 13 is small and the side length of the housing end face 11 is large; the battery case 1 has a small strength and cannot protect the winding core 2 in the battery case 1.

If the ratio of the thickness of the side plate 13 to the side length of the housing end face 11 is too large, the thickness of the side plate 13 is too large or the side length of the housing end face 11 is too small, or the thickness of the side plate 13 is large and the side length of the housing end face 11 is small; the volume and the weight of the battery shell 1 are large, and the energy density of the hexagonal-prism battery 10 is reduced; after the hexagonal prism batteries 10 are grouped, the internal space of the battery box 20 is occupied greatly, and the energy density of the battery pack is reduced; in addition, when the battery case 1 is formed by bending or punching and bending a metal plate, the battery case 1 is not easily molded.

The above ratio ranges can ensure not only the energy density of the hexagonal-prism battery 10 and the battery pack; but also can protect the winding core 2; and the battery shell 1 is easier to form, so that the process difficulty is reduced.

Referring to fig. 4, in some example embodiments of the present disclosure, the battery case 1 may further include a connection portion 14, the connection portion 14 being connected between the adjacent two side plates 13, the connection portion 14 being provided as an arc panel such that the connection portion 14 includes an arc surface. In the case where the battery case 1 is formed by bending or punching a metal plate, an arc-shaped connecting portion 14 is formed between the adjacent two side plates 13, and the arc-shaped connecting portion 14 is connected between the adjacent two side plates 13. Of course, in other example embodiments of the present disclosure, the connecting portion 14 may not be provided between the adjacent two side plates 13.

Further, the radius of curvature r of the connecting portion 14 is 2mm or more and 10mm or less, and for example, the radius of curvature r of the connecting portion 14 may be 2.2mm, 2.5mm, 2.7mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.7mm, 5mm, 5.3mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm, 6.7mm, 7.3mm, 7.5mm, 7.8mm, 8mm, 8.2mm, 8.5mm, 8.7mm, 9mm, 9.3mm, 9.5mm, 9.8mm, or the like.

If the radius of curvature r of the connection portion 14 is large, so that the volume of the battery case 1 is small, resulting in insufficient space for storing gas and electrolyte inside the battery case 1, affecting the charge and discharge rate of the hexagonal-prism battery 10 and the infiltration space of the electrolyte; and after the hexagonal batteries 10 are grouped, a larger reserved space is formed between two adjacent hexagonal batteries 10, so that the space utilization rate of the battery pack is reduced.

If the radius of curvature r of the connection portion 14 is small, the difficulty in molding the battery case 1 is increased, and stress concentration is easily generated at the connection portion 14, and the hexagonal-prism battery 10 is easily broken at the connection portion 14 after expansion and retraction through multiple charge and discharge processes, resulting in a safety accident.

The numerical range can ensure the space for storing gas and electrolyte in the battery shell 1, the charge and discharge rate of the hexagonal prism battery 10 and the infiltration space of the electrolyte, and the space utilization rate of the battery pack; and the molding difficulty of the battery shell 1 can be reduced, the stress concentration at the connecting part 14 is avoided, and the strength of the battery shell 1 is ensured.

The radius of curvature r of the connecting portion 14 may be a radius of curvature of the connecting portion 14 on the side closer to the winding core 2. Of course, it is also possible to define the radius of curvature of the side of the connecting portion 14 facing away from the winding core 2, so that the radius of curvature of the connecting portion 14 can be the above-mentioned value plus the thickness of the connecting portion 14.

Further, the ratio of the radius of curvature r of the connecting portion 14 to the thickness K of the side plate 13 is 1 or more and 40 or less, for example, the ratio of the radius of curvature r of the connecting portion 14 to the thickness K of the side plate 13 may be 2, 5, 7, 10, 13, 15, 18, 20, 22, 25, 27, 30, 33, 35, 38, or the like.

If the ratio of the radius of curvature r of the connecting portion 14 to the thickness K of the side plate 13 is too large, the radius of curvature r of the connecting portion 14 is too large or the thickness K of the side plate 13 is too small, or the radius of curvature r of the connecting portion 14 is large and the thickness K of the side plate 13 is small; the volume of the battery shell 1 is smaller, so that the space for storing gas and electrolyte in the battery shell 1 is insufficient, and the charge and discharge rate of the hexagonal prism battery 10 and the infiltration space of the electrolyte are affected; the battery case 1 is not strong enough, and the winding core 2 in the battery case 1 cannot be protected.

If the ratio of the radius of curvature r of the connecting portion 14 to the thickness K of the side plate 13 is too small, the radius of curvature r of the connecting portion 14 is too small or the thickness K of the side plate 13 is too large, or the radius of curvature r of the connecting portion 14 is small and the thickness K of the side plate 13 is large; the molding difficulty of the battery case 1 is increased, stress concentration is easily generated at the connection part 14, and the hexagonal-prism battery 10 is easily broken at the connection part 14 after expansion and retraction in the multiple charge and discharge processes, resulting in a safety accident; the volume and the weight of the battery shell 1 are larger, and the energy density of the hexagonal-prism battery 10 is reduced; and after the hexagonal prism batteries 10 are grouped, the internal space of the battery box 20 is occupied greatly, and the energy density of the battery pack is reduced.

The ratio range can ensure the space for storing gas and electrolyte in the battery shell 1 and ensure the charge and discharge rate of the hexagonal prism battery 10 and the infiltration space of the electrolyte; the molding difficulty of the battery shell 1 can be reduced, stress concentration at the connecting part 14 is avoided, and the strength of the battery shell 1 is ensured; the energy density of the hexagonal-prism battery 10 and the battery pack can also be ensured.

In the present exemplary embodiment, referring to fig. 2, the winding core 2 may include a winding core body 21 and a tab portion 22. The winding core body 21 is provided as a cylinder, the winding core body 21 is a winding type battery cell, the winding core body 21 has two opposite body end faces 211, and the two body end faces 211 may be a first end face 2111 and a second end face 2112.

Note that, the core body 21 is not limited to a strictly cylindrical body, and there may be some deviation, that is, the core body 21 is substantially a cylindrical body, and in this case, the radius R of the core body 21 is the radius of the smallest circumscribed circle of the core body 21.

The winding core body 21 may be a unit formed by winding a laminated structure, which may include a first electrode sheet, a separator, and a second electrode sheet that are laminated in this order, and when the first electrode sheet is a positive electrode sheet, the second electrode sheet is a negative electrode sheet. Namely, the first pole piece, the second pole piece opposite to the first pole piece and the isolating film arranged between the first pole piece and the second pole piece are wound to obtain the winding type winding core main body 21. Of course, the polarities of the first pole piece and the second pole piece may be interchanged, i.e. the first pole piece may be a negative pole piece and the second pole piece may be a positive pole piece. The first and second pole pieces are coated with an active substance. The following description will take the first pole piece as the positive pole piece and the second pole piece as the negative pole piece as an example.

Further, as shown in fig. 3, the ratio of the radius R of the winding core main body 21 to the side length L of the case end face 11 is 0.3 or more and 0.87 or less, for example, the ratio of the radius R of the winding core main body 21 to the side length L of the case end face 11 may be 0.33, 0.35, 0.38, 0.4, 0.42, 0.45, 0.47, 0.5, 0.53, 0.55, 0.58, 0.6, 0.62, 0.65, 0.67, 0.7, 0.73, 0.75, 0.78, 0.8, 0.82, 0.85, or the like.

If the ratio of the radius R of the winding core main body 21 to the side length L of the case end face 11 is too small, so that the radius R of the winding core main body 21 is too small, the volume of the winding core 2 occupying the accommodating cavity of the battery case 1 is too small, resulting in a larger distance of the gap between the winding core 2 and the battery case 1, resulting in a relatively low energy density of the hexagonal-prism battery 10; the heat generated by the winding core 2 needs to be transferred through the battery shell 1, so that a heat transfer path between the winding core 2 and the battery shell 1 is long, the heat dissipation of the winding core 2 is difficult, and the heat dissipation of the hexagonal-prism battery 10 is difficult; especially, the hexagonal battery 10 having a larger difference between the outer shape of the winding core 2 and the outer shape of the battery case 1 has a smaller contact area between the winding core 2 and the battery case 1, which further results in a more difficult heat dissipation of the winding core 2, and a more difficult heat dissipation of the hexagonal battery 10, and a safety risk is easily caused inside the hexagonal battery 10.

If the ratio of the radius R of the winding core main body 21 to the side length L of the case end face 11 is too large, so that the radius R of the winding core main body 21 is too large, the volume of the winding core 2 occupying the accommodating cavity of the battery case 1 is too large, resulting in insufficient space for storing gas and electrolyte inside the battery case 1; the charge and discharge rate of the hexagonal-prism-shaped battery 10 and the infiltration space of the electrolyte are affected.

Referring to fig. 2, in the height direction Z, which is perpendicular to the case end face 11, the ratio of the height H of the winding core main body 21 to the height H of the accommodating chamber of the battery case 1 is 0.8 or more and 0.99 or less, for example, the ratio of the height H of the winding core main body 21 to the height H of the accommodating chamber of the battery case 1 may be 0.82, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, or the like.

If the ratio of the height H of the winding core body 21 to the height H of the receiving chamber of the battery case 1 is too small, so that the height H of the winding core body 21 is too small, the volume of the winding core 2 occupying the receiving chamber of the battery case 1 is too small, resulting in a relatively low energy density of the hexagonal-prism battery 10.

If the ratio of the height H of the winding core main body 21 to the height H of the accommodating cavity of the battery case 1 is too large, so that the height H of the winding core main body 21 is too large, the volume of the winding core 2 occupying the accommodating cavity of the battery case 1 is too large, and the space for storing gas and electrolyte inside the battery case 1 is insufficient; the charge and discharge rate of the hexagonal-prism-shaped battery 10 and the infiltration space of the electrolyte are affected.

The ratio range can ensure that the space for storing gas and electrolyte in the battery shell 1 is enough, and ensure the charge and discharge rate of the hexagonal prism battery 10 and the infiltration space of the electrolyte; and the energy density of the hexagonal-prism battery 10 can be ensured.

The ratio of the volume V1 of the winding core body 21 to the volume V2 of the battery case 1 is 0.6 or more and 0.95 or less, for example, the ratio of the volume V1 of the winding core body 21 to the volume V2 of the battery case 1 may be 0.62, 0.65, 0.67, 0.7, 0.73, 0.75, 0.78, 0.8, 0.82, 0.85, 0.87, 0.9, 0.93, or the like.

If the ratio of the volume V1 of the winding core body 21 to the volume V2 of the battery case 1 is too small, so that the volume V1 of the winding core body 21 is too small, the volume of the winding core 2 occupying the receiving cavity of the battery case 1 is too small, resulting in a relatively low energy density of the hexagonal-prism battery 10.

If the ratio of the volume V1 of the winding core main body 21 to the volume V2 of the battery case 1 is too large, so that the volume V1 of the winding core main body 21 is too large, the volume of the winding core 2 occupying the accommodating cavity of the battery case 1 is too large, and the space for storing gas and electrolyte inside the battery case 1 is insufficient; the charge and discharge rate of the hexagonal-prism-shaped battery 10 and the infiltration space of the electrolyte are affected.

Volume v1=body end surface 211 of core body 21 s1×height h of core body 21, body end surface 211 s1=pi×radius R of core body 21 ² The method comprises the steps of carrying out a first treatment on the surface of the Volume v2=area s2 of case end face 11 of battery case 1×height H of accommodation chamber, area of case end face 11

In the present exemplary embodiment, the tab portion 22 may include a first tab 221 and a second tab 222, and the first tab 221 and the second tab 222 are led out from at least one end of the winding core body 21. For example, the first tab 221 and the second tab 222 may extend from the same side of the core body 21, that is, the first tab 221 and the second tab 222 may be provided on the same end surface of the core body 21, and the first end surface 2111 provided on the core body 21 will be described below as an example, but may be provided on the second end surface 2112 of the core body 21.

The first tab 221 is connected to the winding core main body 21, specifically, the first tab 221 is connected to the first pole piece, and the first tab 221 is located at a side of the first end surface 2111 facing away from the winding core main body 21; a part of the first pole piece extends out of the winding core main body 21 and is bent to one side of the first end surface 2111 away from the winding core main body 21 to form a first pole lug 221; in this case, the first tab 221 may cover a portion of the first end surface 2111.

The second tab 222 is connected to the core body 21, specifically, the second tab 222 is connected to the second tab, and the second tab 222 is located at a side of the first end surface 2111 facing away from the core body 21, and may be a portion of the second tab extending out of the core body 21 and bent to a side of the first end surface 2111 facing away from the core body 21 to form the second tab 222; in this case, the second tab 222 may cover a portion of the first end surface 2111.

The second tab 222 and the first tab 221 are insulated from each other, and specifically, the insulation between the second tab 222 and the first tab 221 may be achieved by providing an insulating member between the second tab 222 and the first tab 221, or the insulation between the second tab 222 and the first tab 221 may be achieved by providing a space between the second tab 222 and the first tab 221.

The first tab 221 and the second tab 222 extend from the same side of the winding core main body 21, so that the utilization rate of the whole space inside the battery can be improved, and the first tab 221 and the second tab 222 can be respectively connected with a positive electrode post and a negative electrode post which are positioned on the same side of the battery shell 1, namely, the first tab 221 and the second tab 222 are not electrically connected with the battery shell 1; alternatively, the first tab 221 or the second tab 222 is electrically connected to the battery case 1, for example, the first tab 221 and the second tab 222 are correspondingly connected to the battery case 1 and the battery post 3, respectively, specifically, the first tab 221 is connected to the battery post 3 through the current collecting plate 4, and is used as a positive electrode of the hexagonal-prism battery 10; the second tab 222 is connected to the battery case 1 through the current collecting plate 4 and serves as a negative electrode of the hexagonal-prism battery 10; the battery case 1 is used as an electrode lead-out terminal of the hexagonal battery 10, so that the subsequent connection of the hexagonal battery 10 during grouping can be facilitated, the area of the battery case 1 is relatively large, and the reliable overcurrent area of the hexagonal battery 10 during grouping can be ensured, thereby ensuring the overall charge and discharge rate of the hexagonal battery 10.

Of course, in other exemplary embodiments of the present disclosure, the first tab 221 and the second tab 222 may be disposed on opposite end surfaces of the winding core body 21, for example, the first tab 221 is disposed on the first end surface 2111, and the second tab 222 is disposed on the second end surface 2112.

The tab portion 22 is a conductive foil region where no active material coating is provided, that is, the first tab 221 and the second tab 222 are not coated with an active material coating, and the tab portion 22 is a current collecting layer for transmitting current.

Based on the same inventive concept, the exemplary embodiments of the present disclosure provide a battery pack, and referring to fig. 5, the battery pack may include a battery case 20 and a hexagonal battery 10, the hexagonal battery 10 is disposed in the battery case 20, the hexagonal battery 10 is disposed in at least two, the hexagonal battery 10 is any one of the above hexagonal battery 10, and the specific structure of the hexagonal battery 10 has been described in detail above, and thus, will not be described here again.

In the present exemplary embodiment, the battery pack may include the battery case 20, and as shown with reference to fig. 5, the battery pack may be provided in a rectangular parallelepiped structure, and thus, the battery case 20 may be provided in a rectangular parallelepiped structure. Specifically, the battery case 20 may include a bottom plate, a protective cover (not shown), two first side frames 201, and two second side frames 202, and the bottom plate and the protective cover may be provided in a rectangular shape. Two first side frames 201 and two second side frames 202 are arranged around the bottom plate, the two first side frames 201 and the two second side frames 202 are connected end to form a rectangular frame, the first side frames 201 extend along a first direction X, the second side frames 202 extend along a second direction Y, protective covers are arranged on the other sides, opposite to the bottom plate, of the two first side frames 201 and the two second side frames 202, so that the protective covers are arranged opposite to the bottom plate, and the two first side frames 201 and the two second side frames 202 are connected between the protective covers and the bottom plate. The bottom plate, the protective cover, the two first side frames 201 and the two second side frames 202 surround the receiving chamber formed in the battery case 20.

Of course, in other example embodiments of the present disclosure, the bottom plate and the protective cover may be provided in a circular shape, an oval shape, a trapezoid shape, etc., and the side frames may be provided in one or more and surround to form a circular shape, an oval shape, a trapezoid shape, etc., such that the battery case 20 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc. In other embodiments, the battery box 20 may be directly assembled to the chassis without a protective cover, and the battery box 20 may be in other shapes, which are not described in detail herein.

The terms "parallel" and "perpendicular" as used herein are not intended to be entirely parallel, perpendicular, but rather are subject to certain errors; 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

1. A hexagonal-prism battery, comprising:

2. The hexagonal-prism battery according to claim 1, wherein the winding core body is provided as a cylinder, the case end face is provided as a regular hexagon, and a ratio of a radius of the winding core body to a side length of the case end face is 0.3 or more and 0.87 or less.

3. The hexagonal-prism battery according to claim 1, wherein a ratio of a height of the winding core main body to a height of the receiving cavity of the battery case is 0.8 or more and 0.99 or less in a height direction perpendicular to the case end face.

4. The hexagonal-prism battery of claim 1, wherein a ratio of a volume of the jellyroll body to a volume of the battery case is 0.6 or more and 0.95 or less.

5. The hexagonal-prism battery according to any one of claims 1 to 4, wherein the battery case includes:

six side plates, wherein the six side plates are sequentially connected end to form a regular hexagonal prism barrel shape; the thickness of the side plate is more than or equal to 0.3mm and less than or equal to 1mm.

6. The hexagonal-prism battery according to claim 5, wherein a ratio of a thickness of the side plate to a side length of the case end face is 0.7% or more and 5% or less.

7. The hexagonal-prism battery of claim 5, wherein the battery housing further comprises:

and the connecting part is connected between two adjacent side plates and comprises an arc surface.

8. The hexagonal-prism battery according to claim 7, wherein the radius of curvature of the connecting portion is 2mm or more and 10mm or less.

9. The hexagonal-prism battery according to claim 7, wherein a ratio of a radius of curvature of the connecting portion to a thickness of the side plate is 1 or more and 40 or less.

10. A battery pack, comprising:

a battery box;

and the hexagonal-prism batteries are arranged in the battery box, at least two hexagonal-prism batteries are arranged, and the hexagonal-prism batteries are any one of the hexagonal-prism batteries in claims 1 to 9.