CN216720085U - Battery case and battery - Google Patents
Battery case and battery Download PDFInfo
- Publication number
- CN216720085U CN216720085U CN202122929071.8U CN202122929071U CN216720085U CN 216720085 U CN216720085 U CN 216720085U CN 202122929071 U CN202122929071 U CN 202122929071U CN 216720085 U CN216720085 U CN 216720085U
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- Prior art keywords
- cover plate
- battery
- chamfer
- shell
- stepped
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- 210000001503 joint Anatomy 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 2
- 230000007704 transition Effects 0.000 description 8
- 239000002893 slag Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model discloses a battery case, comprising: a housing having an opening at least one end; the cover plate is embedded in the stepped hole of the opening in a clearance fit manner; the cover plate is provided with an inner plate surface and an outer plate surface which are opposite in the thickness direction, and the outer plate surface is welded and connected with the end surface splicing seam of the opening; the cover plate is abutted against the step surface of the stepped hole; the chamfer angle of the step surface of the stepped hole is more than or equal to 20 degrees and less than 90 degrees. The shell of the battery shell is provided with inclined step surfaces, and the area of the step surfaces for the cover plate to abut is increased based on the shell with the fixed thickness change at the step holes, so that the stability of the shell and cover plate assembly structure is improved; the inclined step surface also forms a guide surface for guiding the cover plate to the inner cavity of the shell, the relative position of the cover plate and the shell can be finely adjusted by adjusting the pressure on the cover plate, and the consistency of the laser welding seam of the shell and the cover plate is improved.
Description
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a battery shell and a battery.
Background
The battery case and cover plate assembly structure is disclosed in CN2416613Y, steps are processed around the inner wall of the end face of the case connected with the upper cover, the upper cover is closely connected with the inner wall of the case when the upper cover is embedded on the steps in the cylindrical case, and the connection part is sealed by laser welding.
The above-mentioned housing has the drawbacks that: the step holes are right-angled, in order to ensure the stability of the assembly structure of the shell and the cover plate, the step itself needs to have enough width, and based on the shell with the same size, the increase of the step width can cause the increase of the shell thickness and the reduction of the shell inner cavity; second, right angle step hole depth is fixed with apron thickness dimension, and machining error or apron plane degree are not good can lead to shell terminal surface and apron surface to flush not in the shell apron assembly part, and then influence the laser welding quality of apron.
SUMMERY OF THE UTILITY MODEL
One of the objectives of the present invention is to overcome the drawbacks of the prior art, and to provide a battery case, which increases the area of the step surface in the case without increasing the thickness of the case, so that the step surface and the chamfered surface are fully abutted, and the stability of the assembly structure of the case and the cover plate is improved.
In order to achieve the technical effects, the technical scheme of the utility model is as follows: a battery housing, comprising:
a housing having an opening at least one end;
the cover plate is embedded in the stepped hole of the opening in a clearance fit manner; the cover plate is provided with an inner plate surface and an outer plate surface which are opposite in the thickness direction, and the outer plate surface is welded and connected with the end surface splicing seam of the opening; the cover plate is abutted with the step surface of the stepped hole;
the chamfer angle of the step surface of the stepped hole is more than or equal to 20 degrees and less than 90 degrees.
The preferable technical scheme is that the chamfer angle of the step surface is 45-75 degrees. Optionally, the chamfer angle of the step surface is 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, and the like.
According to the preferable technical scheme, a chamfer surface is connected between the inner plate surface and the side surface of the cover plate, and the chamfer surface is abutted against the step surface; the chamfer angle of the chamfer angle surface is equal to or smaller than the chamfer angle of the step surface.
The preferable technical scheme is that the chamfer angle of the chamfer angle surface is 30-60 degrees. Optionally, the chamfer angle of the step surface is 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, and the like.
The preferred technical scheme does, the shoulder hole includes apron scarf joint hole section, platform stage and electric core and holds the hole section, the internal surface in platform stage does the step face, apron scarf joint hole section with the casing thickness difference that the hole section was held to the electric core is 0.1 ~ 0.3 mm. Optionally, the shell thickness difference is 0.1 mm, 0.15mm, 0.2mm, 0.25mm, 0.3 mm.
The preferred technical scheme is that the cover plate scarf joint hole section and the battery cell accommodating hole section are straight hole sections.
The preferable technical scheme is that the step surface is a closed ring surface arranged along the circumferential direction of the inner wall of the shell, and the chamfer surface is a closed ring surface surrounding the circumferential direction of the edge of the cover plate.
The preferable technical scheme is that the battery shell is a square battery shell.
The preferred technical scheme is that the battery shell is an aluminum shell.
The utility model also provides a battery comprising the battery shell.
The utility model has the advantages and beneficial effects that:
the shell of the battery shell is provided with a step surface with a chamfer angle of more than or equal to 20 degrees and less than 90 degrees, and the area of the step surface for the butt joint of the cover plate is increased based on the shell with the fixed thickness change at the step hole, so that the stability of the shell and cover plate assembly structure is improved;
the slope step face still constitutes the spigot surface of leading apron direction to the casing inner chamber, overcomes the not good problem of apron thickness machining error and/or apron plane degree, and the accessible is adjusted the pressure to the apron, finely tunes the relative position of apron and casing, makes the casing opening terminal surface of scarf joint seam both sides more tend to flush with the planking face of apron, improves the laser welding seam uniformity of casing and apron, improves the welding goodness and prevents non-light tight security.
Drawings
FIG. 1 is a schematic structural view of a housing of the embodiment;
FIG. 2 is a cross-sectional view taken along A-A in FIG. 1;
FIG. 3 is an enlarged view of a portion of the opening of the housing of FIG. 2;
FIG. 4 is an enlarged partial view of the end of the cover abutting the housing of FIG. 3;
FIG. 5 is an enlarged view of a portion of the housing and cover of FIG. 2 at A;
fig. 6 is a partially enlarged view of a battery case a in another embodiment;
fig. 7 is a partially enlarged view of a battery case a in another embodiment;
in the figure: 1. a battery case; 11. a housing; 111. a step surface; 12. a cover plate; 121. an inner plate surface; 122. an outer plate surface; 123. and (5) chamfering.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
The cover plate is abutted against the step surface
The abutting structure of the cover plate and the step surface depends on the structure of the cover plate, and a right-angle included angle, a round corner in smooth transition or a chamfer surface for connecting the inner plate surface and the side surface of the cover plate abuts against the step surface.
The opening at the end part of the shell is used for placing the battery core into the shell, and the step surface of the stepped hole is abutted with the chamfer surface, including surface contact abutment and/or line contact abutment; optionally, the abutting contact part is in a continuous closed ring shape, an intermittent shape or a local abutting shape along the periphery of the plate surface edge of the cover plate. Further, the continuous closed loop abutment can prevent welding slag from entering the inner cavity of the shell cover plate assembly.
Based on apron and the casing of current metal material and clearance fit scarf joint, the butt of chamfer face and step face includes but not limited to following three kinds:
firstly, when the chamfer of the chamfer surface is equal to the chamfer of the step surface, the step surface and the chamfer surface are in surface contact and abutment;
secondly, when the chamfer angle of the chamfer surface is larger than that of the step surface, the step surface is provided with a first side edge and a second side edge which are opposite to each other in the depth direction of the stepped hole, the first side edge is close to the opening, and the chamfer surface is in line contact and butt joint with the first side edge area;
thirdly, when the chamfer of the chamfer surface is smaller than the chamfer of the step surface, the chamfer surface is in line contact and abutting with the second side edge area of the step surface.
The second step surface is not beneficial to the cover plate to further go deep into the shell; when the whole thickness or the local edge of the cover plate slightly protrudes out of the opening end face of the shell, the cover plate is further pressed into the shell by adjusting the whole or local pressure of the cover plate and/or finely adjusting the relative position of the cover plate and the shell based on the first scheme and the third scheme, so that the opening end faces of the shell on the two sides of the scarf joint seam and the outer plate face of the cover plate are more flush.
Examples
As shown in fig. 1 to 5, in one embodiment, the battery case 1 includes a case 11 and a cover plate 12, and one end of the case 11 is provided with an opening; the cover plate 12 has an inner plate surface 121 and an outer plate surface 122 opposite to each other in the thickness direction and having a chamfered surface 123 connected between the inner plate surface 121 and the side surface; the cover plate 12 is embedded in the open stepped hole in a clearance fit manner, the stepped surface 111 of the stepped hole is abutted with the chamfered surface 123, and the outer plate surface 122 is welded with the end surface splicing seam of the opening; the chamfer angle of the step surface 111 of the stepped hole and the chamfer angle of the chamfer surface 123 of the cover plate 12 are both 45 degrees, and the step surface 111 is in surface contact with the chamfer surface 123. The step surface 111 has a first step surface side and a second step surface side which are opposite to each other, and a linear distance between the step surface 111 and a hole center line is gradually reduced from the first step surface side to the second step surface side.
The chamfer vertex of the step surface 111 is any point on the side of the second step surface, the vertex and the hole center line determine an axial section, the axial section is intersected with the step surface 111, and the included angle between the intersection line and a straight line which passes through the vertex and is parallel to the hole center line is the included angle of the step surface 111, such as the included angle alpha in fig. 3. Compared with the right-angled stepped surface 111, on the basis of the same area of the stepped surface 111, the height of the stepped surface 111 protruding towards the center of the hole can be properly reduced, that is, the shell 11 can be thinned, on the premise of ensuring the strength of the shell 11, so as to increase the volume of the inner cavity of the shell 11.
The edge of the chamfer surface 123 connected with the side surface of the cover plate 12 is a first chamfer surface side edge, the chamfer vertex of the chamfer surface 123 is any point on the first chamfer surface side edge, the chamfer vertex of the over-chamfer surface 123 and the cross section of the thickness direction center line of the cover plate 12 are intersected with the side surface of the cover plate 12, and the included angle between the intersection line and a straight line which passes through the vertex and is parallel to the thickness direction center line is the chamfer of the chamfer surface 123, such as ═ β in fig. 4.
Specifically, in the prior art, the case 11 is a rigid case of a battery, including but not limited to a prismatic battery and a cylindrical battery, and the prismatic battery case is usually an aluminum case or other alloy metal material. Taking the square battery case 1 as an example, the step surface 111 may be selectively disposed on one section of the inner wall of the case 11 in the circumferential direction or more than two sections disposed at intervals, so as to achieve the basic technical effect of increasing the abutting area of the step surface 111, and more preferably, the step surface 111 is a closed ring surface disposed along the inner wall of the case 11 in the circumferential direction, that is, in the cross-sectional view along B-B in fig. 1, the enlarged end angle at the opening of the case 11 is as shown in fig. 3; correspondingly, the side surfaces of the cover plate 12 include planar side surfaces corresponding to the long side and the wide side of the cover plate 12, and transition curved surfaces or transition folded surfaces corresponding to transition corners (which may be rounded corners or folded corners, and are usually rounded corners) of the long side and the wide side. The chamfer surface 123 is connected and arranged at an included angle between at least one of the planar side surface, the transition arc surface and the transition folding surface and the inner plate surface 121 of the cover plate 12. Preferably, the chamfer surface 123 is continuously disposed at an included angle between the above planar side surface, the transition arc surface, and the transition folding surface and the inner plate surface 121 of the cover plate 12, that is, the chamfer surface 123 is a closed ring surface around the edge circumference of the cover plate 12.
Instead of increasing the abutting area of the step surface 111 in embodiment 1, the chamfer of the step surface 111 may also be selected from any one of angle point values greater than or equal to 20 ° and less than 90 °, and further from any one of angle point values greater than 45 ° and less than or equal to 75 °, wherein 45 ° has the best effect on increasing the abutting area of the step surface 111. Correspondingly, the chamfer angle of the chamfer surface 123 can be selected to be any angle point value of 30-60 degrees.
As shown in fig. 6, in another embodiment, the chamfer angle α of the step surface 111 is 45 °, the chamfer angle β of the chamfer surface 123 is 32 °, and the chamfer angle of the chamfer surface 123 is smaller than the chamfer angle of the step surface 111. Compared with the cover plate 12 of a cylindrical battery, the cover plate 12 of a part of square batteries has a length and width difference, and the problems of flatness, machining errors and the like of the cover plate are more likely to occur in actual production. In the assembly structure of the cover plate 12 and the housing 11 of this embodiment, the stepped surface 111 can further guide the cover plate 12 into the stepped hole; in addition, the shell 11 and the cover plate 12 enclose a cavity communicated with the gap of the cover plate 12 and the shell 11, as shown by a triangular vacant area in a cross section of fig. 5, the cavity can receive welding slag descending along the gap during laser welding, and the welding slag is prevented from falling into the shell 11, so that the insulation and safety performance of the battery are effectively improved.
As shown in fig. 7, in another embodiment, the chamfer angle α of the step surface 111 is 45 °, the chamfer angle β of the chamfer surface 123 is 32 °, and the chamfer angle of the chamfer surface 123 is also smaller than the chamfer angle of the step surface 111. As in the previous embodiment, the housing 11 and the cover plate 12 enclose a cavity which is in clearance communication with the housing 11 of the cover plate 12 and can contain welding slag.
As shown in fig. 3, the stepped hole includes a cover plate embedding hole section, a step section and a battery cell accommodating hole section, the inner surface of the step section is a step surface 111, the distance between the step surface 111 and the center line of the casing 11 in the hole depth direction is gradually reduced, that is, the thickness of the casing 11 is gradually increased, the thickness difference between the cover plate embedding hole section and the casing 11 of the battery cell accommodating hole section is marked by a in the drawing, a is 0.1-0.3 mm, and preferably 0.15-0.2 mm. The cover plate embedding hole section and the battery cell accommodating hole section are straight hole sections. The housing 11 shown in fig. 2 is the same as the housing 11 in fig. 4 and 5.
As shown in fig. 1, the embodiment is a square-can battery including the battery case 1 of the above embodiment. Alternatively, the housing and the cover plate may be in face contact abutment or line contact abutment as in the embodiments.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A battery housing, comprising:
a housing having an opening at least one end;
the cover plate is embedded in the stepped hole of the opening in a clearance fit manner; the cover plate is provided with an inner plate surface and an outer plate surface which are opposite in the thickness direction, and the outer plate surface is welded and connected with the end surface splicing seam of the opening; the cover plate is abutted with the step surface of the stepped hole;
the stepped hole is characterized in that the chamfer angle of the stepped surface of the stepped hole is more than or equal to 20 degrees and less than 90 degrees.
2. The battery case according to claim 1, wherein the chamfer of the step surface is 45 to 75 °.
3. The battery shell according to claim 1, wherein a chamfer is connected between the inner plate surface and the side surface of the cover plate, and the chamfer abuts against the step surface; the chamfer angle of the chamfer angle surface is equal to or smaller than the chamfer angle of the step surface.
4. The battery case according to claim 3, wherein the chamfer of the chamfer surface is 30 to 60 °.
5. The battery shell according to claim 1, wherein the stepped hole comprises a cover plate embedding hole section, a step section and a battery cell accommodating hole section, the inner surface of the step section is the stepped surface, and the difference between the cover plate embedding hole section and the battery cell accommodating hole section in the shell thickness is 0.1-0.3 mm.
6. The battery casing of claim 5, wherein the cover plate scarf joint hole section and the battery cell accommodating hole section are straight hole sections.
7. The battery case of claim 3, wherein the stepped surface is a closed torus circumferentially disposed along the inner wall of the housing, and the chamfered surface is a closed torus circumferentially around the edge of the cover plate.
8. The battery case of claim 1, wherein the battery case is a prismatic battery case.
9. The battery case of claim 1, wherein the battery case is an aluminum case.
10. A battery comprising a battery housing according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122929071.8U CN216720085U (en) | 2021-11-26 | 2021-11-26 | Battery case and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122929071.8U CN216720085U (en) | 2021-11-26 | 2021-11-26 | Battery case and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216720085U true CN216720085U (en) | 2022-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122929071.8U Active CN216720085U (en) | 2021-11-26 | 2021-11-26 | Battery case and battery |
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| CN (1) | CN216720085U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117080635A (en) * | 2023-10-16 | 2023-11-17 | 蜂巢能源科技股份有限公司 | Shell assembly and battery |
| CN117691269A (en) * | 2024-01-31 | 2024-03-12 | 蜂巢能源科技股份有限公司 | Battery core |
-
2021
- 2021-11-26 CN CN202122929071.8U patent/CN216720085U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117080635A (en) * | 2023-10-16 | 2023-11-17 | 蜂巢能源科技股份有限公司 | Shell assembly and battery |
| CN117691269A (en) * | 2024-01-31 | 2024-03-12 | 蜂巢能源科技股份有限公司 | Battery core |
| CN117691269B (en) * | 2024-01-31 | 2024-04-16 | 蜂巢能源科技股份有限公司 | Battery core |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A battery shell and battery Effective date of registration: 20231125 Granted publication date: 20220610 Pledgee: Yuandong New Energy Co.,Ltd. Pledgor: LIANDONG TIANYI NEW ENERGY Co.,Ltd. Registration number: Y2023980066881 |