Battery shell and battery

Abstract

The utility model discloses a battery shell and a battery. The battery shell comprises a bottom plate, a peripheral side plate and a cover plate, the peripheral side plate is annularly arranged on the periphery of the bottom plate and connected with the bottom plate to form a containing cavity with an opening in one end, the peripheral side plate comprises two oppositely-arranged first side plates, each first side plate comprises a first plate part, a second plate part and a connecting part connected between the first plate part and the second plate part, and the first plate part protrudes out of the second plate part; the cover plate and the bottom plate are oppositely arranged, and the containing cavity is sealed by the cover plate. According to the battery shell and the battery provided by the utility model, the first plate part of the first side plate protrudes out of the second plate part to form the step structure, and the step structure is additionally arranged on the side wall of the battery shell, so that the structural strength of the battery shell is enhanced, the anti-falling performance is improved, and the probability that the battery is damaged when the battery falls is reduced. And the internal battery core is extruded by the battery shell to cause the risk of functional disorder.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packaging, in particular to a battery shell and a battery. Background Art

[0002] The field of battery technology includes many technical branches, among which battery electrode packaging technology is one of the main research projects currently being conducted by technicians in this field.

[0003] Some batteries use alloys as battery shells. The alloys have strong hardness and ductility, and are thin in thickness. They do not require wide sealing edges and folding edges, which reduces the volume of the battery and thus increases the volume energy density of the battery. For example, the prior art provides a battery shell and battery (CN218334016U), the shell is tubular, and its two ends are sealed by connecting a first cover plate and a second cover plate. The connection position between the shell and the first cover plate and the second cover plate does not form a large fillet, thereby increasing the volume inside the battery shell, and the space shape inside the battery shell is more regular, and the battery core can fully occupy the internal space, thereby improving the space utilization of the battery shell, which is conducive to increasing the capacity of the battery and improving its energy density.

[0004] However, since the side walls of the shell are straight edges and the drop resistance is low, when the battery falls, the shell is easily deformed, thereby squeezing the battery cells inside, causing functional disorders of the battery cells and affecting the quality and service life of the battery.

[0005] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0006] The utility model aims to provide a battery housing and a battery, which can enhance the anti-fall performance of the battery housing.

[0007] In the first aspect, in order to solve the above technical problems, the utility model proposes a battery housing, comprising:

[0008] Base plate;

[0009] A peripheral side plate, which is arranged around the outer periphery of the bottom plate and connected to the bottom plate to form a receiving cavity with one end open, the peripheral side plate includes two first side plates arranged opposite to each other, the first side plates include a first plate portion, a second plate portion and a connecting portion connected between the first plate portion and the second plate portion, the first plate portion protrudes from the second plate portion; and,

[0010] The cover plate is arranged opposite to the bottom plate and seals the accommodating cavity.

[0011] Furthermore, a protruding distance of the first plate portion relative to the second plate portion is 0.05-1.0 mm, and a spacing distance between the first plate portion and the second plate portion along their extension directions is 0.05-5.0 mm.

[0012] Furthermore, the outer surface of the connecting portion includes one or a combination of a curved surface, a flat surface, and an inclined surface.

[0013] Furthermore, the connecting portion is plate-shaped, and an angle between the connecting portion and the first plate portion is 90° to 180°.

[0014] Furthermore, the connecting portion includes a first arc portion connected to the second plate portion and a second arc portion connected between the first arc portion and the first plate portion, the centers of curvature of the first arc portion and the second arc portion are located on both sides of the connecting portion, and the first arc portion and the second plate portion and the second arc portion and the first plate portion have a smooth transition.

[0015] Further, the cross-sections of the first arc portion and the second arc portion are arc-shaped, and the radius of the first arc portion is greater than, less than or equal to the radius of the second arc portion.

[0016] Further, the first plate portion and the second plate portion are arranged in parallel and spaced apart;

[0017] The two first side panels are centrally symmetrically arranged.

[0018] Furthermore, the bottom plate and the surrounding side plates are separate structures or integrated structures.

[0019] Furthermore, the end of the peripheral side plate used for connecting with the cover plate is provided with a flange edge extending outward, and the cover plate is connected to the flange edge.

[0020] Furthermore, the peripheral side plate further comprises two second side plates arranged opposite to each other, the two second side plates are connected to the two first side plates to form a ring-shaped peripheral side plate, and an electrode assembly is installed on one of the second side plates;

[0021] The cross-sectional shapes of the bottom plate and the cover plate correspond to the cross-sectional shape of the accommodating cavity;

[0022] The cross section of the second side plate is linear, or has the same structure as the first side plate.

[0023] In a second aspect, the utility model further proposes a battery, comprising the battery housing as described in the first aspect and a battery cell disposed in a receiving cavity of the battery housing.

[0024] Furthermore, the battery core is arranged in a conformal or non-conformal manner to the accommodating cavity.

[0025] Compared with the prior art, the utility model has the following beneficial effects: in the battery casing provided by the utility model, the first side plate of the peripheral side plate includes a first plate portion, a second plate portion and a connecting portion connected between the first plate portion and the second plate portion, and the first plate portion protrudes from the second plate portion to form a step structure. By adding a step structure to the side wall of the battery casing, the structural strength of the battery casing is enhanced, the anti-fall performance is improved, and the risk of functional failure of the internal battery cells due to squeezing by the battery casing when the battery falls is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes and are used to help understand the present invention. They do not specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances. In the drawings:

[0027] Figure 1 It is a three-dimensional structural diagram of the battery housing in the utility model;

[0028] Figure 2 It is a cross-sectional view of the battery housing in the utility model;

[0029] Figure 3 It is a schematic diagram of a connection portion of an embodiment of the utility model connected to a first plate portion and a second plate portion;

[0030] Figure 4 yes Figure 2 Another partial enlarged view of the center A;

[0031] Figure 5 yes Figure 2 A partial enlarged view of point B in the middle;

[0032] Figure 6 It is another cross-sectional view of the peripheral side plate of the battery housing in the utility model;

[0033] Figure 7 It is an exploded view of a battery housing in the utility model;

[0034] Figure 8 It is an exploded view of another battery housing in the utility model;

[0035] Fig. 9 It is an exploded view of another battery housing in the utility model;

[0036] Fig.10 It is an exploded view of the positive electrode assembly of the battery housing in the utility model;

[0037] Fig.11 It is an exploded diagram of the battery in the utility model;

[0038] Fig.12 It is a cross-sectional view of a battery in the utility model. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0040] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] like Figure 1 and Figure 2 As shown, the utility model discloses a battery housing 100 , which includes a bottom plate 1 , a peripheral side plate 2 and a cover plate 3 .

[0043] The peripheral side plate 2 is arranged around the outer periphery of the bottom plate 1 and is connected to the bottom plate 1 to form a accommodating cavity 201 with an opening at one end. The peripheral side plate includes two first side plates 202 arranged opposite to each other. The two first side plates 202 each include a first plate portion 2021, a second plate portion 2022 and a connecting portion 2023 connected between the first plate portion 2021 and the second plate portion 2022. The first plate portion 2021 protrudes from the second plate portion 2022, that is, in the spacing direction of the two second side plates 202, the first plate portion 2021 is located on the outside of the battery housing 100 relative to the second plate portion 2022.

[0044] The cover plate 3 is arranged opposite to the bottom plate 1 and seals the accommodating cavity 201 , and components such as battery cells can be placed in the accommodating cavity 201 .

[0045] The first plate portion 2021 of the peripheral side plate 2 protrudes from the second plate portion 2022 to form a step structure. By adding a step structure to the peripheral side plate 2 (side wall) of the battery casing 100, the structural strength of the battery casing 100 is enhanced, thereby improving the drop resistance, which is beneficial to reducing the risk of deformation of the battery casing when the battery falls, and the internal battery cells are not easily squeezed by the battery casing 100 and functional disorders occur.

[0046] As a preferred embodiment, Figure 3 and Figure 4 As shown, a protruding distance H1 of the first plate portion 2021 relative to the second plate portion 2022 is 0.05-1.0 mm, and a spacing distance H2 between the first plate portion 2021 and the second plate portion 2022 along their extension directions is 0.05-5.0 mm. Figure 2 In the embodiment, the protruding direction of the first plate portion 2021 relative to the second plate portion 2022 is consistent with the width direction X of the battery housing 100, and the protruding distance H1 refers to the spacing distance between the ends of the two plate portions connected in the width direction Y. The extending direction of the first plate portion 2021 and the second plate portion 2022 is consistent with the length direction X of the battery housing 100, and the spacing distance H2 refers to the spacing distance between the ends of the two plate portions connected in the length direction X. By setting the distance H1 and the distance H2, the size of the step structure is made more reasonable, which is conducive to ensuring the anti-fall performance of the battery housing 100.

[0047] The outer surface of the connecting portion 2023 includes a curved surface, a flat surface, an inclined surface, or a combination of the two or more.

[0048] In some embodiments, the connecting portion 2023 is plate-shaped, and an angle α between the connecting portion 2023 and the first plate portion 2021 is 90° to 180°. Figure 3 In the illustrated embodiment, the angle α between the connecting portion 2023 and the first plate portion 2021 is 135°, and the structural strength in the width and length directions is more balanced.

[0049] In some embodiments, Figure 4 As shown, the connecting portion 2023 includes a first arc portion 2024 connected to the second plate portion 2022 and a second arc portion 2025 connected between the first arc portion 2024 and the first plate portion 2021. The centers of curvature of the first arc portion 2024 and the second arc portion 2025 are located on both sides of the connecting portion 2023, and the first arc portion 2024 and the second plate portion 2025 and the second arc portion 2025 and the first plate portion 2021 are smoothly transitioned. By providing the first arc portion 2024 and the second arc portion 2025, the internal stress at the turning point of the first side plate 202 can be reduced, and processing and forming are facilitated.

[0050] Optionally, the cross-sections of the first arc portion 2024 and the second arc portion 2025 are arc-shaped, approximately in an S-shaped structure, and the radius R1 of the first arc portion 2024 may be greater than, less than or equal to the radius R2 of the second arc portion 2025. Figure 4 In the embodiment, the radius R1 of the first arc portion 2024 is greater than the radius R2 of the second arc portion 2025 . The structural design of the connecting portion 2023 can effectively enhance the anti-fall strength of the peripheral side plate 2 .

[0051] Optionally, the connecting portion 2023 has the same wall thickness as the first plate portion 2021 and the second plate portion 2022 .

[0052] like Figures 2 to 4 As shown, the first plate portion 2021 and the second plate portion 2022 are arranged in parallel and spaced apart; the two first side plates 202 are arranged symmetrically, with a beautiful appearance and reasonable design. The width of the battery shell is basically the same at all places, which is conducive to ensuring the capacity of the battery shell and preventing the reduction of battery power due to the reduction of the battery shell capacity.

[0053] In some embodiments, Figure 7 As shown, the bottom plate 1 and the surrounding side plate 2 are split structures. At the same time, since the two ends of the surrounding side plate 2 are sealed by the bottom plate 1 and the cover plate 3, the connection position of the surrounding side plate 2 and the bottom plate 1 and the cover plate 3 will not form a large fillet, which reduces the curvature of the four corners of the battery housing 100, thereby increasing the volume of the accommodating cavity 201, thereby improving the space utilization of the battery housing 100, which is conducive to increasing the capacity of the battery; in other embodiments, such as Figure 8 and Fig. 9 As shown, the bottom plate 1 and the surrounding side plates 2 are an integrated structure, which is simple to process, reduces the assembly process, and enhances the firmness of the structure.

[0054] In other feasible embodiments, such as Fig. 9 As shown, the end of the peripheral side plate 2 for connecting with the cover plate 3 is provided with a flange edge 4 extending outward, and the cover plate 3 is connected with the flange edge 4. Preferably, the flange edge 4 is arranged parallel to the cover plate 3 and extends horizontally away from the accommodating cavity 201. The cover plate 3 is connected with the flange edge 4 by welding and then dispensing glue, so as to seal the accommodating cavity 201.

[0055] like Figure 2 and Figure 6 As shown, the peripheral side plate 2 further includes two second side plates 203 arranged opposite to each other. The two second side plates 203 are connected to the two first side plates 202 to form a ring-shaped peripheral side plate 2, and an electrode assembly is installed on one of the second side plates 203.

[0056] The bottom plate 1 and the cover plate 3 are both made of metal or alloy material, and the alloy material is preferably stainless steel, and more preferably stainless steel 316L. Preferably, in this embodiment, the bottom plate 1 and the cover plate 3 are both made of conductive stainless steel. Figures 7 to 9 As shown, the cross-sectional shapes of the bottom plate 1 and the cover plate 3 correspond to the cross-sectional shape of the accommodating cavity 201 .

[0057] In some embodiments, Figure 2 As shown, the cross section of the second side plate 203 is linear and can be made directly of sheet material, such as a flat plate; in other embodiments, such as Figure 6 As shown, the second side plate 203 can also be configured to have the same structure as the first side plate 202 , that is, a connecting portion 2023 is also provided on the second side plate 203 to form a step structure to further enhance the anti-fall strength of the surrounding side plate 2 .

[0058] like Figure 1 As shown, the electrode assembly includes a positive electrode assembly 5 and a negative electrode assembly 6, at least part of the positive electrode assembly 5 is arranged on the inner side of the second side plate 203, which facilitates the installation of the positive electrode assembly 5; the negative electrode assembly 6 and the positive electrode assembly 5 are exposed on the same surface of the second side plate 203, and the negative electrode assembly 6 is arranged on the outside of the second side plate 203. When the battery housing 100 is in use, the battery cell only needs to be connected to the second side plate 203 to be conductively connected to the negative electrode assembly 6.

[0059] like Figure 5 and Fig.10 As shown, the positive electrode assembly 5 includes a positive electrode column 501, an outer insulating member 502, an inner insulating member 503 and a conductive sheet 504. The positive electrode column 501 includes a column 5011 and a first sheet 5012 and a second sheet 5013 connected to the two ends of the column 5011. The column 5011 passes through the second side plate 203 and extends to the outside of the second side plate 203. The outer insulating member 502, the inner insulating member 503 and the conductive sheet 504 are all arranged on the outside of the column 5011, and the second sheet 5013 is located on the outside of the conductive sheet 504; the negative electrode assembly 6 includes a connecting sheet connected to the second side plate 203.

[0060] like Figure 5 , Figures 7 to 9 As shown, the second side plate 203 is also provided with an injection hole 204 for electrolyte to enter the accommodating chamber 201 , and the injection hole 204 is installed with a liquid blocking plug 7 , which is made of stainless steel. The electrolyte is conveniently filled into the accommodating chamber 201 through the injection hole 204 .

[0061] Further, such as Figures 7 to 9 As shown, at least one explosion-proof groove 8 is disposed on the bottom plate 1 and the cover plate 3 . The explosion-proof groove 8 is arc-shaped and faces the accommodating cavity 201 .

[0062] like Fig.11 and Fig.12 As shown, the utility model also proposes a battery 200, comprising the above-mentioned battery housing 100 and a battery cell 300 disposed in a receiving cavity 201 of the battery housing 100. The battery cell 300 is conductively connected to the positive electrode assembly 5. At the same time, the receiving cavity 201 of the battery housing 100 can be filled with an electrolyte, and the electrolyte allows the positive electrode assembly 5 and the negative electrode assembly 6 to conduct ions, so that the battery 200 obtains advantages such as high voltage and high specific energy.

[0063] As a preferred embodiment, the battery cell 300 and the accommodating cavity 201 are arranged in a conformal or non-conformal manner, such as Fig.12 As shown, the shape of the battery cell 300 corresponds to the cross-sectional shape of the accommodating cavity 210, so as to fully utilize the internal space of the battery housing and increase the power of the battery.

[0064] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the preceding claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including the disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to waive the content of the column, nor should it be considered that the applicant has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A battery housing, characterized in that: include: Base plate; A peripheral side plate, which is arranged around the outer periphery of the bottom plate and connected to the bottom plate to form a receiving cavity with one end open, the peripheral side plate includes two first side plates arranged opposite to each other, the first side plates include a first plate portion, a second plate portion and a connecting portion connected between the first plate portion and the second plate portion, the first plate portion protrudes from the second plate portion; and, The cover plate is arranged opposite to the bottom plate and seals the accommodating cavity.

2. The battery housing according to claim 1, characterized in that: The protrusion distance of the first plate portion relative to the second plate portion is 0.05-1.0 mm, and the spacing distance between the first plate portion and the second plate portion along the extension direction of the first plate portion and the second plate portion is 0.05-5.0 mm.

3. The battery housing according to claim 1, characterized in that: The outer surface of the connecting portion includes a curved surface, a flat surface, an inclined surface, or a combination of the two or more.

4. The battery case according to claim 3, characterized in that: The connecting portion is plate-shaped, and the angle between the connecting portion and the first plate portion is 90° to 180°.

5. The battery case according to claim 3, characterized in that: The connecting portion includes a first arc portion connected to the second plate portion and a second arc portion connected between the first arc portion and the first plate portion, the centers of curvature of the first arc portion and the second arc portion are located on both sides of the connecting portion, and the first arc portion and the second plate portion and the second arc portion and the first plate portion have a smooth transition.

6. The battery case according to claim 5, characterized in that: The cross-sections of the first arc portion and the second arc portion are arc-shaped, and the radius of the first arc portion is greater than, less than or equal to the radius of the second arc portion.

7. The battery case according to claim 1, characterized in that: The first plate portion and the second plate portion are arranged in parallel and spaced apart; The two first side panels are centrally symmetrically arranged.

8. The battery casing according to claim 1, characterized in that: The bottom plate and the peripheral side plates are of separate structures or integrated structures.

9. The battery casing according to claim 1, characterized in that: The end of the peripheral side plate used for connecting with the cover plate is provided with a flange edge extending outward, and the cover plate is connected with the flange edge.

10. The battery housing according to any one of claims 1 to 9, characterized in that: The peripheral side plate further comprises two second side plates arranged opposite to each other, the two second side plates are connected to the two first side plates to form a ring-shaped peripheral side plate, and an electrode assembly is installed on one of the second side plates; The cross-sectional shapes of the bottom plate and the cover plate correspond to the cross-sectional shape of the accommodating cavity; The cross section of the second side plate is linear, or has the same structure as the first side plate.

11. A battery, characterized in that: It comprises a battery casing as claimed in any one of claims 1 to 10 and a battery cell arranged in a receiving cavity of the battery casing.

12. The battery according to claim 11, characterized in that The battery core is arranged in a conformal or non-conformal manner with the accommodating cavity.

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