Battery case and battery

Abstract

The embodiment of the utility model discloses a battery case and a battery, the battery case comprises a first case and a second case, the first case comprises a first side wall and a plurality of first connecting walls fixedly arranged on the peripheral side of the first side wall; the second shell comprises a second side wall and a plurality of second connecting walls fixedly arranged on the peripheral side of the second side wall; the sides, away from the first side wall, of the first connecting walls abut against the sides, away from the second side wall, of the second connecting walls correspondingly and are welded and fixed to form a plurality of third side walls. The maximum projection area of each third side wall is smaller than the maximum projection area of the first side wall or smaller than the maximum projection area of the second side wall. Due to the fact that the first connecting wall and the second connecting wall are small connecting faces, the small connecting faces are smaller in deformation after being bent and formed, the strength of the small connecting faces is higher than that of the large connecting faces, and then welding is conducted on the small connecting faces, the welding deformation can be reduced, and the welding quality and the welding yield are improved.

Description

Technical Field

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

[0002] At present, with the increasing miniaturization, lightness and portability of electronic products, such as cameras, notebooks and mobile phones, the driving power of these electronic products is also developing in the direction of high capacity, high safety and lightness. Batteries are widely used in electronic products due to their excellent characteristics such as high capacity.

[0003] The battery includes a shell, a top cover and a battery cell. The shell is provided with a shell cavity, and the battery cell is placed in the shell cavity. Two poles are provided on the top cover. The poles are electrically connected to the battery cell through a soft connecting piece and can be connected to the outside.

[0004] In the prior art, risks such as shell deformation and air leakage are prone to occur during the shell manufacturing process. Utility Model Content

[0005] The utility model aims to provide a battery shell and a battery, aiming to solve the problem that risks such as shell deformation and air leakage are prone to occur during the shell manufacturing process of existing batteries.

[0006] In a first aspect, the utility model provides a battery case, comprising:

[0007] A first shell, the first shell comprising a first side wall and a plurality of first connecting walls fixedly arranged around the first side wall;

[0008] And a second shell, the second shell includes a second side wall and a plurality of second connecting walls fixed on the periphery of the second side wall; the sides of the plurality of first connecting walls away from the first side wall respectively contact with the sides of the plurality of second connecting walls away from the second side wall and are welded and fixed to form a plurality of third side walls; the maximum projection area of ​​each of the third side walls is smaller than the maximum projection area of ​​the first side wall or smaller than the maximum projection area of ​​the second side wall.

[0009] In one embodiment, the first side wall is arranged opposite to the second side wall, and a plurality of the third side walls, the first side wall and the second side wall are combined to form a shell body;

[0010] The shell body is provided with a mounting cavity and an opening communicating with the mounting cavity;

[0011] The battery case further includes a cover body, and the cover body is disposed on the opening.

[0012] In one embodiment, the shell body and the cover body are both structural members made of iron metal, and the thickness of the wall plate of the shell body is between 0.03mm-1.20mm; and / or,

[0013] The opening is arranged at the top of the shell body, and one end of the cover body away from the opening is higher than the top of the shell body.

[0014] In one embodiment, a limiting protrusion is provided on one side of the shell body close to the opening, and the limiting protrusion is provided at the connection between the third side wall and the first side wall, and / or the limiting protrusion is provided at the connection between the third side wall and the second side wall; a supporting portion for abutting against the limiting protrusion is provided on the cover body; and / or,

[0015] The battery shell also includes a pole and an explosion-proof plate, wherein the pole and the explosion-proof plate are spaced apart and distributed on the cover body, and a liquid injection hole is provided on the cover body, wherein the liquid injection hole and the explosion-proof plate are respectively arranged on both sides of the pole.

[0016] In one embodiment, the battery shell also includes a pole, which is installed on the cover body, and the pole includes a first pole ear and a second pole ear that are stamped; the first pole ear is provided with a first connecting portion, and the second pole ear is provided with a second connecting portion for cooperating with the first connecting portion, and the first connecting portion and the second connecting portion are butt-welded.

[0017] In one embodiment, the first pole tab protrudes toward the second pole tab to form a first connecting portion, the second pole tab protrudes toward the first pole tab to form a second connecting portion, and the first connecting portion is butt-welded to the second connecting portion.

[0018] In one embodiment, the first pole tab protrudes toward the second pole tab to form a first connecting portion, and the first connecting portion is butt-welded to the second pole tab;

[0019] Alternatively, the second pole tab protrudes toward the first pole tab to form a second connecting portion, and the first pole tab is butt-welded to the second connecting portion.

[0020] In one embodiment, the battery case further comprises a first plastic plate, a second plastic plate and a sealing ring, the cover comprises an outer surface and an inner surface arranged opposite to each other, the cover is provided with a through hole penetrating the outer surface and the inner surface, and the first pole ear and the second pole ear are butt-welded through the through hole;

[0021] The first plastic plate is arranged between the first pole lug and the outer surface, the second plastic plate is arranged between the second pole lug and the inner surface, the sealing ring is arranged in the through hole and elastically abuts between the inner surface and the second pole lug.

[0022] In one embodiment, the first plastic plate includes a plastic plate body and an extension portion fixedly disposed on the plastic plate body, wherein the extension portion is disposed in the through hole;

[0023] The extending portion comprises an extending section for being positioned flush with the hole wall of the through hole, and a guiding section connected to the extending section, wherein the guiding section is provided with a guiding surface for guiding the sealing ring.

[0024] In a second aspect, the utility model further provides a battery, comprising a battery cell and a battery shell according to any one of the above embodiments, wherein the battery cell is disposed in the battery shell.

[0025] The following beneficial effects are achieved by using the embodiments of the present invention:

[0026] In the battery case and battery of the utility model, the side of the several first connecting walls away from the first side wall respectively contacts the side of the several second connecting walls away from the second side wall, and are welded and fixed to form several third side walls; the maximum projection area of ​​each third side wall is smaller than the maximum projection area of ​​the first side wall or smaller than the maximum projection area of ​​the second side wall. Since the first connecting wall and the second connecting wall are small connecting surfaces, the deformation of the small connecting surface after bending and forming is smaller, and the strength of the relatively large connecting surface is higher. Then, by welding on the small connecting surface, the deformation of the welding can be reduced to improve the welding quality and welding yield, thereby reducing the deformation of the shell after welding and reducing the risk of air leakage in the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] in:

[0029] Figure 1 Schematic diagram of a battery case in one embodiment.

[0030] Figure 2 for Figure 1 Schematic diagram of the shell body in the battery shell shown.

[0031] Figure 3 for Figure 2 Another angle schematic diagram of the shell body shown.

[0032] Figure 4 for Figure 3 Enlarged schematic diagram of part A in the middle.

[0033] Figure 5 for Figure 1 A top view of the battery case is shown.

[0034] Figure 6 for Figure 5 Middle BB section view.

[0035] Figure 7 for Figure 6 Enlarged schematic diagram of part C in the middle.

[0036] Figure 8 for Figure 1 Schematic diagram of the terminal column in the battery case shown.

[0037] Reference numerals: 100, shell body; 101, mounting cavity; 102, opening; 110, first shell; 111, first side wall; 112, first connecting wall; 120, second shell; 121, second side wall; 122, second connecting wall; 130, first wall surface; 131, first weld; 140, second wall surface; 141, second weld; 150, third wall surface; 151, third weld; 160, limiting protrusion; 200, cover body; 230, injection hole; 240, outer surface; 250, inner surface; 260, through hole; 300, pole; 310, first pole ear; 311, first connecting portion; 320, second pole ear; 321, second connecting portion; 400, explosion-proof disk; 500, first plastic plate; 510, plastic plate body; 520, extension portion; 521, extension section; 522, guide section; 523, guide surface; 600, second plastic plate; 700, sealing ring. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0041] See also Figures 1 to 3 The utility model provides a battery shell, which is used to encapsulate a battery cell. The battery shell includes a first shell 110 and a second shell 120. The first shell 110 includes a first side wall 111 and a plurality of first connecting walls 112 fixedly arranged on the periphery of the first side wall 111. The second shell 120 includes a second side wall 121 and a plurality of second connecting walls 122 fixedly arranged on the periphery of the second side wall 121. The sides of the plurality of first connecting walls 112 away from the first side wall 111 are respectively in contact with the sides of the plurality of second connecting walls 122 away from the second side wall 121 and are welded and fixed to form a plurality of third side walls. The maximum projection area of ​​each third side wall is smaller than the maximum projection area of ​​the first side wall 111 or smaller than the maximum projection area of ​​the second side wall 121.

[0042] It can be understood that since the first connecting wall 112 and the second connecting wall 122 are small connecting surfaces, the deformation of the small connecting surface after bending is smaller and the strength of the relatively large connecting surface is higher. Then, by welding on the small connecting surface, the deformation of the welding can be reduced to improve the welding quality and welding yield, thereby reducing the deformation of the shell after welding and reducing the risk of air leakage in the weld.

[0043] In one embodiment, the first side wall 111 and the second side wall 121 are arranged opposite to each other, and a plurality of third side walls, the first side wall 111 and the second side wall 121 are enclosed to form a shell body 100; the shell body 100 is provided with an installation cavity 101 and an opening 102 connected to the installation cavity 101; the battery shell also includes a cover body 200, which is covered on the opening 102.

[0044] In this embodiment, there are three third side walls, namely the first wall 130, the second wall 140 and the third wall 150, wherein the first wall 130, the second wall 140 and the third wall 150 are respectively welded to form the first weld 131, the second weld 141 and the third weld 151, by setting each weld at the middle position of several third side walls, each weld is located on the narrow side of the battery shell, and the structural strength of the battery shell near the narrow side is relatively high. By welding on the narrow side, the deformation of the welding can be reduced to improve the welding quality and the welding yield rate.

[0045] In one embodiment, please continue to refer to Figures 1 to 3 The shell body 100 and the cover body 200 are both structural parts made of iron metal. Compared with the aluminum metal shell, the strength of iron metal is higher, so the wall thickness of the shell body 100 can be made thinner, which reduces the overall weight and manufacturing cost of the battery shell and ensures that the structural strength of the battery shell will not be reduced.

[0046] Further, the wall thickness of the shell body 100 is between 0.03mm-1.20mm, and preferably, the wall thickness of the shell body 100 can be selected between 0.05mm-1.00mm. Of course, the wall thickness of the cover body 200 can also be between 0.03mm-1.20mm. Preferably, the wall thickness of the shell body 100 can be selected between 0.05mm-1.00mm. Specifically, the wall thickness of the shell body 100 can be selected as 0.03mm, 0.05mm, 0.10mm, 0.30mm, 0.50mm, 0.70mm, 0.90mm, 1.00mm or 1.20mm. The wall thickness of the cover body 200 can be selected as 0.03mm, 0.05mm, 0.10mm, 0.30mm, 0.50mm, 0.70mm, 0.90mm, 1.00mm or 1.20mm. Of course, in other embodiments, the wall thickness of the shell body 100 and the cover body 200 can be selected to be 1.30 mm, 1.40 mm or 1.50 mm or more, and the greater the wall thickness, the higher the structural strength of the battery shell. Of course, in other embodiments, the shell body 100 and the cover body 200 can also be structural members made of copper metal or other metal materials.

[0047] In one embodiment, please refer to Figure 4A limiting protrusion 160 is provided on one side of the shell body 100 close to the opening 102, and the limiting protrusion 160 is provided at the connection between the third side wall and the first side wall 111, and / or the limiting protrusion 160 is provided at the connection between the third side wall and the second side wall 121; a supporting portion for abutting against the limiting protrusion 160 is provided on the cover body 200; through such a configuration, the limiting protrusion 160 is provided at the connection between the side walls on the shell body 100, and the supporting portion of the cover body 200 can abut against the limiting protrusion 160, thereby realizing the assembly of the shell body 100 and the cover body 200.

[0048] Furthermore, in the present embodiment, each limiting protrusion 160 is arranged on the inner wall of the shell body 100, that is, each limiting protrusion 160 is arranged in the installation cavity 101, and the cover body 200 is embedded in the shell body 100. The support portion can be inserted into the installation cavity 101 from the opening 102 and abut against the limiting protrusion 160. Through such a setting, each limiting protrusion 160 can be restricted to the four corners in the installation cavity 101, thereby reducing the influence of the setting of the limiting protrusion 160 on the installation space in the installation cavity 101, facilitating the spatial arrangement of the battery cell in the installation cavity 101, and thereby improving the performance of the battery cell.

[0049] Of course, in other embodiments, each limiting protrusion 160 can also be set on the outer wall of the shell body 100, and the cover body 200 is sleeved on the outside of the shell body 100, and the support part can abut against the limiting protrusion 160 on the outside of the shell body 100.

[0050] In one embodiment, please refer to Figure 5 and Figure 6 , the opening 102 is opened at the top of the shell body 100, and the end of the cover body 200 away from the opening 102 is higher than the top of the shell body 100. By setting it in this way, the upper plane of the cover body 200 can be higher than the upper end surface of the shell body 100, thereby avoiding the undesirable situation that the upper end surface plate of the shell body 100 extends alone to produce sharp edges. It can be understood that by controlling the position of the limiting protrusion 160 away from the opening 102 in the shell body 100 and controlling the length of the support part, the height of the end of the cover body 200 away from the opening 102 above the top of the shell body 100 can be controlled, and the packaging is completed by welding the overlapping part of the cover body 200 and the shell body 100.

[0051] In one embodiment, see Figure 5The battery case also includes a pole 300 and an explosion-proof plate 400, which are spaced apart on the cover 200. The cover 200 is provided with a liquid injection hole 230, and the liquid injection hole 230 and the explosion-proof plate 400 are respectively arranged on both sides of the pole 300, so that the electrolyte remaining around the liquid injection hole 230 during the battery cell injection can be blocked by the pole 300, preventing the electrolyte from diffusing to the explosion-proof plate 400 area, and ensuring that the explosion-proof performance of the explosion-proof plate 400 is stable and reliable. Specifically, the cover 200 is a plate structure made of steel plates integrally stamped, and two poles 300 are provided, which are symmetrically arranged on both sides of the explosion-proof plate 400.

[0052] In one embodiment, see Figures 5 to 8 The battery shell also includes a pole 300, which is installed on the cover body 200, and the pole 300 includes a first pole ear 310 and a second pole ear 320 that are stamped; the first pole ear 310 is provided with a first connecting portion 311, and the second pole ear 320 is provided with a second connecting portion 321 for cooperating with the first connecting portion 311, and the first connecting portion 311 and the second connecting portion 321 are butt-welded, and other parts of the first pole ear 310 other than the first connecting portion 311, and other parts of the second pole ear 320 other than the second connecting portion 321 can also be used as adapters, that is, the first pole ear 310 and the second pole ear 320 can also be connected to external wiring, thereby reducing the number of components for preparing the pole 300, simplifying the welding process, reducing the preparation cost of the pole 300, and thereby reducing the production cost of the battery shell.

[0053] In this embodiment, the specific arrangement of the pole 300 has multiple specific implementations. In one implementation, the center of the first pole ear 310 protrudes toward the second pole ear 320 to form a first connection portion 311, the center of the second pole ear 320 protrudes toward the first pole ear 310 to form a second connection portion 321, and the first connection portion 311 and the second connection portion 321 are butt-welded to complete the preparation of the pole 300. In another implementation, the center of the first pole ear 310 protrudes toward the second pole ear 320 to form a first connection portion 311, and the first connection portion 311 and the center of the second pole ear 320 are butt-welded to complete the preparation of the pole 300. In another implementation, the center of the second pole ear 320 protrudes toward the first pole ear 310 to form a second connection portion 321, and the center of the first pole ear 310 and the second connection portion 321 are butt-welded to complete the preparation of the pole 300. Specifically, the first pole ear 310 and the second pole ear 320 can be structural members made of different materials.

[0054] In one embodiment, see Figure 7The battery case further includes a first plastic plate 500, a second plastic plate 600 and a sealing ring 700. The cover body 200 includes an outer surface 240 and an inner surface 250 arranged opposite to each other. The cover body 200 is provided with a through hole 260 penetrating the outer surface 240 and the inner surface 250. The first pole ear 310 and the second pole ear 320 are butt-welded through the through hole 260. The first plastic plate 500 is arranged between the first pole ear 310 and the outer surface 240, the second plastic plate 600 is arranged between the second pole ear 320 and the inner surface 250, and the sealing ring 700 is arranged around the through hole 260 and elastically abuts between the inner surface 250 and the second pole ear 320, thereby realizing the sealing arrangement of the pole 300 on the cover body 200.

[0055] Further, in this embodiment, the first plastic plate 500 includes a plastic plate body 510, and an extension portion 520 fixedly arranged on the plastic plate body 510, and the extension portion 520 is arranged in the through hole 260; the extension portion 520 includes an extension section 521 for being positioned flatly with the hole wall of the through hole 260, and a guide section 522 connected to the extension section 521, and the guide section 522 is provided with a guide surface 523 for guiding the sealing ring 700. Through such a configuration, the guiding effect of the guide surface 523 can facilitate the assembly of the sealing ring 700, and the flat positioning of the extension section 521 can enhance the positioning accuracy of the first plastic plate 500 when installed on the cover 200, and facilitate the assembly of the first plastic plate 500.

[0056] During assembly, the pole 300 , the explosion-proof disk 400 , the first plastic plate 500 , the second plastic plate 600 and the sealing ring 700 are first fixedly mounted on the cover body 200 , and then the cover body 200 is fixedly welded to the shell body 100 .

[0057] See also Figures 1 to 8 The utility model also provides a battery, which includes a battery cell and a battery shell of any of the above embodiments, wherein the battery cell is arranged in the battery shell. It can be understood that the side of the plurality of first connecting walls 112 away from the first side wall 111 respectively contacts with the side of the plurality of second connecting walls 122 away from the second side wall 121, and is welded and fixed to form a plurality of third side walls; the maximum projection area of ​​each third side wall is smaller than the maximum projection area of ​​the first side wall 111 or the maximum projection area of ​​the second side wall 121. Since the first connecting wall 112 and the second connecting wall 122 are small connecting surfaces, the deformation of the small connecting surface after bending is smaller, and the strength of the connecting surface with relatively large strength is higher. Then, by welding on the small connecting surface, the deformation of the welding can be reduced to improve the welding quality and welding yield, thereby reducing the deformation of the shell after welding and reducing the risk of air leakage in the weld.

[0058] In one embodiment, the battery cell may be a wound battery cell, the battery may be a new energy battery, and the battery may be applied to the fields of power batteries and energy storage.

[0059] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A battery shell, characterized in that: include: A first shell (110), the first shell (110) comprising a first side wall (111) and a plurality of first connecting walls (112) fixedly arranged on the periphery of the first side wall (111); and a second shell (120), the second shell (120) comprising a second side wall (121) and a plurality of second connecting walls (122) fixedly arranged on the circumference of the second side wall (121); the sides of the plurality of first connecting walls (112) away from the first side wall (111) respectively contact with the sides of the plurality of second connecting walls (122) away from the second side wall (121) and are welded and fixed to form a plurality of third side walls; the maximum projection area of ​​each of the third side walls is smaller than the maximum projection area of ​​the first side wall (111) or smaller than the maximum projection area of ​​the second side wall (121).

2. The battery case according to claim 1, characterized in that: The first side wall (111) and the second side wall (121) are arranged opposite to each other, and a plurality of the third side walls, the first side wall (111) and the second side wall (121) are enclosed to form a shell body (100); The shell body (100) is provided with a mounting cavity (101) and an opening (102) communicating with the mounting cavity (101); The battery case further comprises a cover body (200), wherein the cover body (200) is arranged to cover the opening (102).

3. The battery case according to claim 2, characterized in that: The shell body (100) and the cover body (200) are both structural members made of iron metal, and the wall plate thickness of the shell body (100) is between 0.03 mm and 1.20 mm; and / or, The opening (102) is opened at the top of the shell body (100), and one end of the cover body (200) away from the opening (102) is higher than the top of the shell body (100).

4. The battery case according to claim 2, characterized in that: A limiting protrusion (160) is provided on one side of the shell body (100) close to the opening (102), and the limiting protrusion (160) is provided at the connection between the third side wall and the first side wall (111), and / or the limiting protrusion (160) is provided at the connection between the third side wall and the second side wall (121); a supporting portion for abutting against the limiting protrusion (160) is provided on the cover body (200); and / or, The battery case further comprises a pole (300) and an explosion-proof plate (400), wherein the pole (300) and the explosion-proof plate (400) are spaced apart and distributed on the cover body (200), and a liquid injection hole (230) is provided on the cover body (200), and the liquid injection hole (230) and the explosion-proof plate (400) are respectively arranged on both sides of the pole (300).

5. The battery case according to claim 2, characterized in that: The battery shell also includes a pole (300), wherein the pole (300) is mounted on the cover (200), and the pole includes a first pole ear (310) and a second pole ear (320) that are stamped and formed; the first pole ear (310) is provided with a first connecting portion (311), and the second pole ear (320) is provided with a second connecting portion (321) for cooperating with the first connecting portion (311), and the first connecting portion (311) and the second connecting portion (321) are butt-welded.

6. The battery case according to claim 5, characterized in that: The first pole lug (310) protrudes toward the second pole lug (320) to form a first connecting portion (311), and the second pole lug (320) protrudes toward the first pole lug (310) to form a second connecting portion (321), and the first connecting portion (311) and the second connecting portion (321) are butt-welded.

7. The battery case according to claim 5, characterized in that: The first pole lug (310) protrudes toward the second pole lug (320) to form a first connecting portion (311), and the first connecting portion (311) is butt-welded to the second pole lug (320); Alternatively, the second pole lug (320) protrudes toward the first pole lug (310) to form a second connecting portion (321), and the first pole lug (310) and the second connecting portion (321) are butt-welded.

8. The battery case according to claim 5, characterized in that: The battery case further comprises a first plastic plate (500), a second plastic plate (600) and a sealing ring (700); the cover body (200) comprises an outer surface (240) and an inner surface (250) arranged opposite to each other; a through hole (260) is provided on the cover body (200) penetrating the outer surface (240) and the inner surface (250); the first pole lug (310) and the second pole lug (320) are butt-welded through the through hole (260); The first plastic plate (500) is arranged between the first pole lug (310) and the outer surface (240), the second plastic plate (600) is arranged between the second pole lug (320) and the inner surface (250), and the sealing ring (700) is arranged around the through hole (260) and elastically abuts between the inner surface (250) and the second pole lug (320).

9. The battery case according to claim 8, characterized in that: The first plastic plate (500) comprises a plastic plate body (510) and an extension portion (520) fixedly arranged on the plastic plate body (510), and the extension portion (520) is arranged in the through hole (260); The extension portion (520) comprises an extension section (521) for being aligned with the hole wall of the through hole (260), and a guide section (522) connected to the extension section (521), wherein the guide section (522) is provided with a guide surface (523) for guiding the sealing ring (700).

10. A battery, characterized in that: The battery comprises a battery cell and a battery shell according to any one of claims 1 to 9, wherein the battery cell is disposed in the battery shell.

Images