Quadrangular prism battery

Abstract

The utility model relates to the technical field of batteries, and discloses a quadrangular prism battery. The quadrangular prism battery comprises a composite shell and a battery cell, the composite shell comprises a metal shell and an insulating shell which are arranged in a stacked mode, the metal shell and the insulating shell are of an integrally-formed structure, the composite shell is provided with a side composite plate, a transition connecting part and a supporting composite plate, and the included angle between the side composite plate and the supporting composite plate is larger than or equal to 85 degrees and smaller than or equal to 105 degrees; the transition connecting part is connected between the side composite plate and the supporting composite plate; the battery cell is arranged in the composite shell, the supporting composite plate is used for supporting the battery cell, the curvature radius of one surface, close to the battery cell, of the transition connecting part is R1, the curvature radius of one surface, away from the battery cell, of the transition connecting part is R2, and R1 is smaller than R2. According to the quadrangular prism battery, the risk that the bottom of the battery cell is bent and wrinkled can be reduced, the positive plate and the negative plate are prevented from being bent and wrinkled, and the defects that the positive plate and the negative plate are prone to material falling and self-discharging are avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a quadrangular prism battery. Background Art

[0002] The metal shell and insulating shell of the composite shell are an integrally formed structure. The low strength of the insulating shell results in weak supporting strength for the battery cell, which causes the bottom of the battery cell to be easily bent and wrinkled, causing the positive and negative electrodes to bend and wrinkled as well, resulting in the positive and negative electrodes to easily fall off and self-discharge.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned related technologies and provide a quadrangular prism battery.

[0005] According to one aspect of the present disclosure, there is provided a quadrangular prism battery, comprising:

[0006] A composite shell, comprising a stacked metal shell and an insulating shell, wherein the metal shell and the insulating shell are an integrally formed structure, the composite shell has a side composite plate and a supporting composite plate, the angle between the side composite plate and the supporting composite plate is greater than or equal to 85° and less than or equal to 105°, and a transition connection portion is provided between the side composite plate and the supporting composite plate;

[0007] The battery cell is arranged in the composite shell, the supporting composite plate is used to support the battery cell, the curvature radius of the side of the transition connection portion close to the battery cell is R1, and the curvature radius of the side of the transition connection portion away from the battery cell is R2, and R1 is smaller than R2.

[0008] In the quadrangular prism battery disclosed in the present invention, the curvature radius R1 of the side of the transition connection part close to the battery cell is smaller than the curvature radius R2 of the side of the transition connection part away from the battery cell; on the one hand, the arc length from the side composite plate to the supporting composite plate of the side of the transition connection part close to the battery cell is shorter, the contact area between the battery cell and the transition connection part is reduced, and the interference amount generated between the bottom of the battery cell and the transition connection part is reduced, thereby reducing the risk of bending and wrinkling of the bottom of the battery cell, avoiding bending and wrinkling of the positive and negative electrode sheets, and avoiding the defects of material shedding and self-discharge of the positive and negative electrode sheets; and enabling the battery cell to penetrate deeply To the bottom of the composite shell, the capacity of the composite shell is increased, thereby increasing the energy density of the quadrangular prism battery; on the other hand, the curvature radius of the side of the transition connection part away from the battery cell is set to be larger, so that the distance between the side of the transition connection part away from the battery cell and the side of the transition connection part close to the battery cell is shortened, that is, the thickness of the transition connection part is thinner, and the heat of the transition connection part is more concentrated, so it is more conducive to the rapid heat dissipation of the composite shell; and when the composite shell is formed, the side composite plate and the supporting composite plate can be formed by stretching or stamping, which is conducive to the forming of the composite shell.

[0009] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of an exemplary embodiment of a quadrangular prism battery disclosed in the present invention.

[0012] Figure 2 It is a cross-sectional schematic diagram of an exemplary embodiment of a quadrangular prism battery disclosed in the present invention.

[0013] Figure 3 FIG. 4 is a cross-sectional schematic diagram of another exemplary embodiment of a quadrangular prism battery disclosed herein.

[0014] Description of reference numerals:

[0015] 1. Composite shell; 11. Metal shell; 12. Insulation shell; 13. Side composite plate; 14. Transition connection; 15. Support composite plate;

[0016] 2. battery cell; 21. main body; 22. first pole ear; 23. second pole ear;

[0017] 3. Cover plate; 4. First pole; 5. Second pole. DETAILED DESCRIPTION

[0018] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0019] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on 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.

[0020] 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 "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0021] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is just a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0022] The exemplary embodiment of the present disclosure provides a quadrangular prism battery, referring to Figure 1-Figure 3As shown, the quadrangular prism battery may include a composite shell 1 and a battery cell 2; the composite shell 1 may include a stacked metal shell 11 and an insulating shell 12, the metal shell 11 and the insulating shell 12 are an integrally formed structure, the composite shell 1 has a side composite plate 13 and a supporting composite plate 15, the angle between the side composite plate 13 and the supporting composite plate 15 is greater than or equal to 85° and less than or equal to 105°, and a transition connection portion 14 is provided between the side composite plate 13 and the supporting composite plate 15; the battery cell 2 is provided in the composite shell 1, the supporting composite plate 15 is used to support the battery cell 2, the curvature radius of the side of the transition connection portion 14 close to the battery cell 2 is R1, and the curvature radius of the side of the transition connection portion 14 away from the battery cell 2 is R2, and R1 is smaller than R2.

[0023] The quadrangular prism battery disclosed in the present invention, on the one hand, makes the arc length of the side of the transition connection part 14 close to the battery cell 2 from the side composite plate 13 to the supporting composite plate 15 shorter, the contact area between the battery cell 2 and the transition connection part 14 is reduced, and the interference amount generated by the bottom of the battery cell 2 and the transition connection part 14 is reduced, thereby reducing the risk of bending and wrinkling of the bottom of the battery cell 2, avoiding bending and wrinkling of the positive electrode sheet and the negative electrode sheet, and avoiding the positive electrode sheet and the negative electrode sheet from easily falling off and self-discharging; and the battery cell 2 can penetrate into the bottom of the composite shell 1, thereby increasing the capacity of the composite shell 1, thereby increasing The energy density of the quadrangular prism battery; on the other hand, the curvature radius of the side of the transition connection part 14 away from the battery cell 2 is set to be larger, so that the distance between the side of the transition connection part 14 away from the battery cell 2 and the side of the transition connection part 14 close to the battery cell 2 is shortened, that is, the thickness of the transition connection part 14 is thinner, so that the heat of the transition connection part 14 is more concentrated, and it is more conducive to the rapid heat dissipation of the composite shell 1; and when the composite shell 1 is formed, the side composite plate 13 and the supporting composite plate 15 can be formed by stretching or stamping, which is beneficial to the forming of the composite shell 1.

[0024] In this example implementation, refer to Figure 1 and Figure 2As shown, the composite shell 1 of the quadrangular prism battery can be set as a rectangular parallelepiped structure. Specifically, the composite shell 1 may include five wall panels, and the five wall panels are respectively a supporting composite plate 15 and four side composite plates 13. The four side composite plates 13 are arranged opposite to each other in pairs; the four side composite plates 13 are connected end to end in sequence to form a rectangular cylindrical shape. A supporting composite plate 15 is connected to one side of the four side composite plates 13, so that the supporting composite plate 15 and the four side composite plates 13 surround and form a receiving cavity. Moreover, the angle β between the side composite plate 13 and the supporting composite plate 15 is greater than or equal to 85° and less than or equal to 105°, that is, the side composite plate 13 and the supporting composite plate 15 are basically arranged vertically, for example, the angle β between the side composite plate 13 and the supporting composite plate 15 can be 87°, 90°, 93°, 95°, 98°, 100°, 103°, etc. A cover plate 3 is connected to the other side of the four side composite plates 13, and the cover plate 3 is used to seal the opening of the composite shell 1.

[0025] It should be noted that the quadrangular prism battery is not limited to a strict quadrangular prism. The quadrangular prism battery is basically a quadrangular prism structure. For example, a convex structure or a concave structure can be set on one face, two faces or more faces, or the connection between the faces can be an arc-shaped connection part.

[0026] Reference Figure 2 and Figure 3 As shown, the composite shell 1 may include a metal shell 11 and an insulating shell 12 that are stacked, so that the supporting composite plate 15 and the four side composite plates 13 of the composite shell 1 are all laminated structures including two layers of a metal layer and an insulating layer. The metal shell 11 and the insulating shell 12 are an integrally formed structure, that is, the metal shell 11 and the insulating shell 12 are formed by an integral forming process. For example, an insulating layer can be formed on a metal plate by bonding, coating, hot melting and other processes, and then the metal plate formed with the insulating layer is subjected to a stamping process or a stretching process, so that the metal plate formed with the insulating layer forms a composite shell 1 with a receiving cavity, that is, the metal plate forms the metal shell 11, and the insulating layer forms the insulating shell 12. The integrally formed structure is not to firstly form a metal shell 11 with a receiving cavity by a stamping process or a stretching process on the metal plate, and then form an insulating shell 12 on the metal shell 11 by bonding, coating, hot melting and other processes. The integrally formed structure makes the connection between the metal shell 11 and the insulating shell 12 tighter, and there is almost no gap between the metal shell 11 and the insulating shell 12. Moreover, the preparation process is relatively simple, which is conducive to improving efficiency.

[0027] Since the composite shell 1 is formed by a stamping process or a stretching process, a transition connection portion 14 is connected between the four side composite plates 13 and the supporting composite plate 15. The transition connection portion 14 is configured as an annular structure with an arc-shaped cross-section, so that the side composite plates 13 and the supporting composite plates 15 can be smoothly transitionally connected.

[0028] In this example implementation, refer to Figure 2 and Figure 3 As shown, a battery cell 2 is arranged in the accommodating cavity of the composite shell 1, and the battery cell 2 is arranged as a cuboid that matches the composite shell 1. The supporting composite plate 15 is used to support the battery cell 2, which causes the bottom of the battery cell 2 to easily interfere with the transition connection portion 14. In addition, the low strength of the insulating shell 12 causes the weak support strength of the battery cell 2, which causes the bottom of the battery cell 2 to be easily bent and wrinkled, so that the positive and negative electrode sheets are also bent and wrinkled, causing the positive and negative electrode sheets to easily fall off and self-discharge.

[0029] In this example implementation, refer to Figure 2 and Figure 3 As shown, the curvature radius of the side of the transition connection part 14 close to the battery cell 2 is R1, and the curvature radius of the side of the transition connection part 14 away from the battery cell 2 is R2; that is, the side of the transition connection part 14 close to the battery cell 2 is an arc surface, and the curvature radius of the arc surface is R1; the side of the transition connection part 14 away from the battery cell 2 is also an arc surface, and the curvature radius of the arc surface is R2. The center of the side of the transition connection part 14 away from the battery cell 2 and the center of the side of the transition connection part 14 close to the battery cell 2 may be the same point, or they may not be the same point.

[0030] R1 is smaller than R2 , that is, the curvature radius R1 of a side of the transition portion 14 close to the battery cell 2 is smaller than the curvature radius R2 of a side of the transition portion 14 away from the battery cell 2 .

[0031] Such arrangement makes the arc length of the side of the transition connection part 14 close to the battery cell 2 from the side composite plate 13 to the supporting composite plate 15 shorter, the contact area between the battery cell 2 and the transition connection part 14 is reduced, and the interference amount generated by the bottom of the battery cell 2 and the transition connection part 14 is reduced, thereby reducing the risk of bending and wrinkling of the bottom of the battery cell 2, avoiding bending and wrinkling of the positive and negative electrode sheets, and avoiding the positive and negative electrode sheets from easily falling off and self-discharging; and allowing the battery cell 2 to penetrate into the bottom of the composite shell 1, thereby increasing the capacity of the composite shell 1, and thereby increasing the energy density of the quadrangular prism battery.

[0032] Moreover, the curvature radius of the side of the transition connection part 14 facing away from the battery cell 2 is set to be larger, so that the distance between the side of the transition connection part 14 facing away from the battery cell 2 and the side of the transition connection part 14 close to the battery cell 2 is shortened, that is, the thickness of the transition connection part 14 is thinner, and the heat of the transition connection part 14 is more concentrated, which is more conducive to the rapid heat dissipation of the composite shell 1; and when the composite shell 1 is formed, the side composite plate 13 and the supporting composite plate 15 can be formed by stretching or stamping, which is beneficial to the forming of the composite shell 1.

[0033] It should be noted that the curvature radius R1 of the side of the transition connection portion 14 close to the battery cell 2 refers to the curvature radius formed by the cross-section formed by the side of the transition connection portion 14 close to the battery cell 2 along the direction perpendicular to the supporting composite plate 15; similarly, the curvature radius R2 of the side of the transition connection portion 14 away from the battery cell 2 refers to the curvature radius formed by the cross-section formed by the side of the transition connection portion 14 away from the battery cell 2 along the direction perpendicular to the supporting composite plate 15.

[0034] In this example embodiment, the ratio of the curvature radius R2 of the side of the transition connection portion 14 facing away from the battery cell 2 to the curvature radius R1 of the side of the transition connection portion 14 close to the battery cell 2 is greater than or equal to 1.15 and less than or equal to 1.5. For example, the ratio of the curvature radius R2 of the side of the transition connection portion 14 facing away from the battery cell 2 to the curvature radius R1 of the side of the transition connection portion 14 close to the battery cell 2 can be 1.18, 1.2, 1.22, 1.25, 1.27, 1.3, 1.33, 1.35, 1.38, 1.4, 1.42, 1.45, 1.47, etc.

[0035] If the ratio of the curvature radius R2 of the side of the transition connection portion 14 facing away from the battery cell 2 to the curvature radius R1 of the side of the transition connection portion 14 close to the battery cell 2 is too small, the difference between the curvature radius R2 of the side of the transition connection portion 14 facing away from the battery cell 2 and the curvature radius R1 of the side of the transition connection portion 14 close to the battery cell 2 will be too small, which is not conducive to the realization of the above-mentioned beneficial effects.

[0036] If the ratio of the curvature radius R2 of the side of the transition connection part 14 facing away from the battery cell 2 to the curvature radius R1 of the side of the transition connection part 14 close to the battery cell 2 is too large, that is, the difference between the curvature radius R2 of the side of the transition connection part 14 facing away from the battery cell 2 and the curvature radius R1 of the side of the transition connection part 14 close to the battery cell 2 is too large, the distance between the side of the transition connection part 14 facing away from the battery cell 2 and the side of the transition connection part 14 close to the battery cell 2 is too small, that is, the thickness of the transition connection part 14 is too thin, and the transition connection part 14 is prone to breakage, affecting the safety performance and service life of the quadrilateral battery.

[0037] The above numerical range not only reduces the contact area between the battery cell 2 and the transition connection part 14, reduces the interference between the bottom of the battery cell 2 and the transition connection part 14, thereby reducing the risk of bending and wrinkling of the bottom of the battery cell 2, avoiding bending and wrinkling of the positive and negative electrode sheets, and avoiding the defects of the positive and negative electrode sheets falling off and self-discharging; it enables the battery cell 2 to penetrate into the bottom of the composite shell 1, improves the capacity of the composite shell 1, and thus improves the energy density of the quadrangular prism battery. It is also conducive to the molding of the composite shell 1, and will not cause the thickness of the transition connection part 14 to be too thin, which will make the transition connection part 14 easy to break, so as to ensure the safety performance and service life of the quadrangular prism battery.

[0038] The metal shell 11 can be an aluminum shell, an aluminum alloy shell, a steel shell or a copper shell, etc., that is, the material of the metal shell 11 can be aluminum, aluminum alloy, steel or copper, etc. Of course, it can also be other materials, which are not described here one by one.

[0039] The material of the insulating shell 12 may be a polymer or a resin. For example, the material of the insulating shell 12 may be polyethylene, polytetrafluoroethylene, polypropylene, polyimide, polyethylene terephthalate, polycarbonate, and the like.

[0040] In this example embodiment, the curvature radius R1 of the side of the transition connection portion 14 close to the battery cell 2 is greater than or equal to 0.5 mm and less than or equal to 5 mm. For example, the curvature radius R1 of the side of the transition connection portion 14 close to the battery cell 2 can be 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.7 mm, 4 mm, 4.3 mm, 4.5 mm, 4.8 mm, etc.

[0041] Optionally, a curvature radius R1 of a surface of the transition connection portion 14 close to the battery core 2 is greater than or equal to 2 mm and less than or equal to 5 mm.

[0042] If the curvature radius R1 of the side of the transition connection part 14 close to the battery cell 2 is too small, the distance between the side of the transition connection part 14 facing away from the battery cell 2 and the side of the transition connection part 14 close to the battery cell 2 will be too small, that is, the thickness of the transition connection part 14 is too thin, and the transition connection part 14 is prone to breakage, affecting the safety performance and service life of the quadrilateral battery.

[0043] If the curvature radius R1 of the side of the transition connection part 14 close to the battery cell 2 is too large, the arc length from the side composite plate 13 to the supporting composite plate 15 of the side of the transition connection part 14 close to the battery cell 2 is too long, and the contact area between the battery cell 2 and the transition connection part 14 is too large, resulting in a large amount of interference between the bottom of the battery cell 2 and the transition connection part 14, so that the positive and negative electrode sheets are bent and wrinkled, which makes the positive and negative electrode sheets easy to fall off and self-discharge; and the battery cell 2 cannot penetrate into the bottom of the composite shell 1, which is not conducive to improving the energy density of the quadrangular prism battery.

[0044] The above numerical range is not only conducive to the molding of the composite shell 1, but also will not cause the thickness of the transition connection part 14 to be too thin, which will make the transition connection part 14 easily break, so as to ensure the safety performance and service life of the quadrangular prism battery; it also ensures that the positive and negative electrode sheets are not prone to material falling off and self-discharge, and is conducive to improving the energy density of the quadrangular prism battery.

[0045] In some example embodiments of the present disclosure, reference is made to Figure 2 As shown, the insulating shell 12 can be arranged on the inner surface of the metal shell 11, that is, the insulating shell 12 is arranged closer to the battery cell 2 relative to the metal shell 11. The insulating shell 12 can increase the ability of the composite shell 1 to resist electrolyte corrosion and increase the insulation effect between the metal shell 11 and the battery cell 2.

[0046] In some example embodiments of the present disclosure, reference is made to Figure 3 As shown, the insulating shell 12 can be arranged on the outer surface of the metal shell 11, that is, the metal shell 11 is arranged closer to the battery core 2 than the insulating shell 12; the insulating shell 12 can increase the insulation effect between the metal shell 11 and the outside world.

[0047] In this case, the curvature radius R2 of the side of the transition connection portion 14 facing away from the battery cell 2 is greater than or equal to 2 mm and less than or equal to 8 mm. For example, the curvature radius R2 of the side of the transition connection portion 14 facing away from the battery cell 2 can be 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.7 mm, 4 mm, 4.3 mm, 4.5 mm, 4.8 mm, 5 mm, 5.2 mm, 5.5 mm, 5.7 mm, 6 mm, 6.3 mm, 6.5 mm, 6.8 mm, 7 mm, 7.2 mm, 7.5 mm, 7.7 mm, etc.

[0048] If the curvature radius R2 of the side of the transition portion 14 facing away from the battery cell 2 is too small, the curvature radius R1 of the side of the transition portion 14 close to the battery cell 2 will be even smaller, which is not conducive to the molding of the composite shell 1 .

[0049] If the curvature radius R2 of the side of the transition connection part 14 facing away from the battery cell 2 is too large, the curvature radius R1 of the side of the transition connection part 14 close to the battery cell 2 will also be large, so that the arc length from the side composite plate 13 to the supporting composite plate 15 of the side of the transition connection part 14 close to the battery cell 2 is too long, and the contact area between the battery cell 2 and the transition connection part 14 is too large, resulting in a large amount of interference between the bottom of the battery cell 2 and the transition connection part 14, so that the positive and negative electrode sheets are bent and wrinkled, which makes the positive and negative electrode sheets prone to material shedding and self-discharge; and the battery cell 2 cannot penetrate into the bottom of the composite shell 1, which is not conducive to improving the energy density of the quadrangular prism battery.

[0050] The above numerical range is not only conducive to the molding of the composite shell 1, but also ensures that the positive electrode sheet and the negative electrode sheet are not prone to material dropout and self-discharge, and is conducive to improving the energy density of the quadrangular prism battery.

[0051] In the present example embodiment, the ratio of the thickness H1 of the side composite plate 13 to the thickness H2 of the supporting composite plate 15 is greater than or equal to 0.3 and less than or equal to 0.8. For example, the ratio of the thickness H1 of the side composite plate 13 to the thickness H2 of the supporting composite plate 15 may be 0.32, 0.35, 0.37, 0.4, 0.43, 0.45, 0.48, 0.5, 0.52, 0.55, 0.57, 0.6, 0.63, 0.65, 0.68, 0.7, 0.72, 0.75, 0.77, and the like.

[0052] The thickness H2 of the supporting composite plate 15 is set thicker so that the strength of the supporting composite plate 15 is sufficient to stably support the battery cell 2 ; the thickness of the side composite plate 13 is set thinner so that the side composite plate 13 can be deformed appropriately to provide expansion space for the battery cell 2 .

[0053] If the ratio of the thickness H1 of the side composite plate 13 to the thickness H2 of the supporting composite plate 15 is too large, the thickness H1 of the side composite plate 13 is too thick, resulting in that the side composite plate 13 cannot be properly deformed and cannot provide expansion space for the battery cell 2; or the thickness H2 of the supporting composite plate 15 is too thin, resulting in that the strength of the supporting composite plate 15 is insufficient to stably support the battery cell 2.

[0054] If the ratio of the thickness H1 of the side composite plate 13 to the thickness H2 of the supporting composite plate 15 is too small, the thickness H1 of the side composite plate 13 is too thin and easily damaged; or the thickness H2 of the supporting composite plate 15 is too thick and the energy density of the quadrangular prism battery cannot be guaranteed.

[0055] The above numerical range not only ensures that the strength of the supporting composite plate 15 is sufficient to stably support the battery cell 2, but also enables the side composite plate 13 to deform appropriately to provide expansion space for the battery cell 2; and the side composite plate 13 is not easily damaged, and the energy density of the quadrangular prism battery can be ensured.

[0056] In this exemplary embodiment, the thickness H2 of the supporting composite plate 15 is greater than or equal to 0.5 mm. For example, the thickness H2 of the supporting composite plate 15 may be 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, etc., so that the strength of the supporting composite plate 15 is sufficient to stably support the battery cell 2. Of course, the thickness of the supporting composite plate 15 may also be other values ​​depending on the specific size of the quadrangular prism battery.

[0057] In this example embodiment, at the supporting composite plate 15, the ratio of the thickness H51 of the metal shell 11 to the thickness H52 of the insulating shell 12 is greater than or equal to 10. For example, the ratio of the thickness H51 of the metal shell 11 to the thickness H52 of the insulating shell 12 can be 10.2, 10.5, 10.7, 11, 11.3, 11.5, 11.8, 12, etc.

[0058] Since the metal shell 11 is relatively strong, the thickness of the metal shell 11 is set relatively thick at the supporting composite plate 15 , so that the strength of the supporting composite plate 15 is sufficient to stably support the battery cell 2 .

[0059] If the ratio of the thickness H51 of the metal shell 11 to the thickness H52 of the insulating shell 12 is too small, the thickness H51 of the metal shell 11 is small, resulting in insufficient strength of the supporting composite plate 15 to stably support the battery cell 2 .

[0060] The above numerical range ensures that the strength of the supporting composite plate 15 is sufficient to stably support the battery cell 2 .

[0061] In the present example embodiment, at the side composite plate 13, a ratio of a thickness H31 of the metal shell 11 to a thickness H32 of the insulating shell 12 is greater than or equal to 0.7 and less than or equal to 20. For example, the ratio of the thickness of the metal shell 11 to the thickness of the insulating shell 12 may be 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, and the like.

[0062] At the side composite plate 13 , the thickness H31 of the metal shell 11 is set to be relatively thin, so that the side composite plate 13 can be deformed appropriately, providing expansion space for the battery cell 2 .

[0063] If the ratio of the thickness H31 of the metal shell 11 to the thickness H32 of the insulating shell 12 is too small, the thickness H32 of the insulating shell 12 is too large, which is not conducive to the heat dissipation of the quadrangular prism battery; or the thickness H31 of the metal shell 11 is too small, resulting in insufficient strength of the side composite plate 13, and the side composite plate 13 is easily broken when it expands during the battery charging and discharging process.

[0064] If the ratio of the thickness H31 of the metal shell 11 to the thickness H32 of the insulating shell 12 is too large, the thickness H31 of the metal shell 11 is too large, resulting in the side composite plate 13 being unable to deform properly and unable to provide expansion space for the battery cell 2; or the thickness H32 of the insulating shell 12 is too small, the insulating shell 12 is easily damaged during the process of installing the battery cell 2 into the composite shell 1, affecting the insulation and corrosion resistance of the insulating shell 12.

[0065] The above numerical range allows the side composite plate 13 to deform appropriately, providing expansion space for the battery cell 2; it is also beneficial to the heat dissipation of the quadrangular prism battery; it also ensures that the side composite plate 13 is strong enough and not easily broken; the insulating shell 12 is also not easily damaged, so as to ensure the insulation and corrosion resistance of the insulating shell 12.

[0066] Reference Figure 2 and Figure 3 As shown, the battery cell 2 may include a main body 21, a first pole piece 22 and a second pole piece 23. The main body 21 may include a first pole piece, a separator and a second pole piece arranged in layers, that is, the battery cell 2 may include a plurality of first pole pieces and a second pole piece (not shown in the figure) arranged in layers, and a separator arranged between the first pole piece and the second pole piece, and the battery cell 2 is a stacked type. The battery cell 2 may also be a wound type, and the stacked structure formed by the first pole piece, the separator and the second pole piece is wound to form a wound type battery cell 2. Different active materials are coated on the first pole piece and the second pole piece.

[0067] The polarity of the first electrode is opposite to that of the second electrode. For example, the first electrode may be a positive electrode and the second electrode may be a negative electrode. Of course, the first electrode may be a negative electrode and the second electrode may be a positive electrode.

[0068] In this example embodiment, the main body 21 has a first end face and a second end face that are arranged opposite to each other, and the second end face is closer to the supporting composite plate 15 than the first end face, that is, the first end face can be the top face of the main body 21, and the second end face can be the bottom face of the main body 21.

[0069] The first electrode tab 22 and the second electrode tab 23 may be disposed on a side of the first end surface away from the main body 21 , that is, the first electrode tab 22 and the second electrode tab 23 are led out from the same side of the main body 21 .

[0070] Specifically, the first pole ear 22 is connected to the first pole piece, and the first pole ear 22 is located on the side of the first end face away from the main body 21; a part of the first pole piece may extend out of the main body 21 and be bent to the side of the first end face away from the main body 21 to form the first pole ear 22.

[0071] The second pole ear 23 is connected to the second pole piece and is located on the side of the first end surface away from the main body 21 . The second pole ear 23 may be formed by a portion of the second pole piece extending out of the main body 21 and being bent to the side of the first end surface away from the main body 21 .

[0072] It should be noted that the first pole tab 22 and the second pole tab 23 are conductive foil areas without active material coating, that is, no active material coating is coated on the first pole tab 22 and the second pole tab 23, and they are current collecting layers for transmitting current.

[0073] The first pole tab 22 is connected to the first pole 4, so that the first pole 4 forms the positive pole of the battery; the second pole tab 23 is connected to the second pole 5, so that the second pole 5 forms the negative pole of the battery.

[0074] The "parallel" and "perpendicular" mentioned in this application can not only be completely parallel or perpendicular, but also can have a certain error; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, the two are considered to be parallel to each other; if the angle between the two is greater than or equal to 85° and less than or equal to 95°, the two are considered to be perpendicular to each other.

[0075] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A quadrangular prism battery, characterized in that: include: A composite shell, comprising a stacked metal shell and an insulating shell, wherein the metal shell and the insulating shell are an integrally formed structure, the composite shell has a side composite plate and a supporting composite plate, the angle between the side composite plate and the supporting composite plate is greater than or equal to 85° and less than or equal to 105°, and a transition connection portion is provided between the side composite plate and the supporting composite plate; The battery cell is arranged in the composite shell, the supporting composite plate is used to support the battery cell, the curvature radius of the side of the transition connection portion close to the battery cell is R1, and the curvature radius of the side of the transition connection portion away from the battery cell is R2, and R1 is smaller than R2.

2. The quadrangular prism battery according to claim 1, characterized in that: A ratio of a curvature radius R2 of a surface of the transition connection portion facing away from the battery cell to a curvature radius R1 of a surface of the transition connection portion close to the battery cell is greater than or equal to 1.15 and less than or equal to 5.

3. The quadrangular prism battery according to claim 1, characterized in that: A curvature radius R1 of a surface of the transition connection portion close to the battery core is greater than or equal to 0.5 mm and less than or equal to 5 mm.

4. The quadrangular prism battery according to claim 3, characterized in that: A curvature radius R1 of a surface of the transition connection portion close to the battery core is greater than or equal to 2 mm and less than or equal to 5 mm.

5. The quadrangular prism battery according to claim 1, characterized in that: The insulating shell is arranged on the outer surface of the metal shell, and the curvature radius R2 of a side of the transition connection portion away from the battery core is greater than or equal to 2 mm and less than or equal to 8 mm.

6. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The ratio of the thickness of the side composite plate to the thickness of the support composite plate is greater than or equal to 0.3 and less than or equal to 0.

8.

7. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The thickness of the supporting composite plate is greater than or equal to 0.5 mm.

8. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: At the supporting composite plate, a ratio of a thickness of the metal shell to a thickness of the insulating shell is greater than or equal to 10.

9. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: At the side composite plate, a ratio of a thickness of the metal shell to a thickness of the insulating shell is greater than or equal to 0.7 and less than or equal to 20.

10. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The metal shell is an aluminum shell, an aluminum alloy shell, a steel shell or a copper shell, and / or the insulating shell is made of a polymer or a resin.

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