CN217114562U - Battery pack upper shell and battery pack - Google Patents
Battery pack upper shell and battery pack Download PDFInfo
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- CN217114562U CN217114562U CN202220639294.2U CN202220639294U CN217114562U CN 217114562 U CN217114562 U CN 217114562U CN 202220639294 U CN202220639294 U CN 202220639294U CN 217114562 U CN217114562 U CN 217114562U
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Abstract
The utility model provides a casing and battery package on battery package, the utility model discloses a casing on battery package, including the roof to and locate the lateral wall that the ring crown wall circumference of one side of roof was arranged, be formed with between roof and the lateral wall and hold the chamber, and be connected with the flange portion that is used for with lower shell coupling in the limit portion of keeping away from roof one side of lateral wall, and the inhomogeneous setting of thickness of flange portion. The utility model discloses a casing on battery package, through the inhomogeneous setting of thickness that makes flange portion, can optimize lateral wall and flange portion hookup location's stress state, reduce flange portion and lateral wall hookup location's stress size, and then reduce the risk that flange portion and lateral wall hookup location take place the fracture.
Description
Technical Field
The utility model relates to a vehicle battery wraps technical field, in particular to casing on battery package. Meanwhile, the utility model also relates to a battery pack with the battery pack upper shell.
Background
The lithium ion battery as a new energy secondary battery has the advantages of large energy density, large power density, high working voltage, light weight, small volume, long cycle life, good safety performance, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, power supplies for electric vehicles and the like. However, the battery pack shell has the problems of insufficient strength, easy cracking of the upper part of the shell and the like, the safety performance of the lithium ion battery is seriously influenced, and the further development of the lithium ion battery is limited.
The upper shell of the battery pack is used as an important component of the lithium ion battery pack, and the performance of the upper shell directly influences the normal use of the lithium ion battery. The smc (sheet molding compound) composite material is a material used for the battery pack upper case of most pure electric vehicles on the market due to its excellent strength, fire-proof performance and material density. However, the problem that the shell of the battery pack made of the SMC composite material is easy to crack is not solved effectively all the time, so that the further development and application of the SMC composite material in the field of lithium ion batteries are limited.
The inventor finds that, when designing the existing SMC composite upper case, the existing SMC composite upper case generally includes a top wall, a side wall connected to the top wall, and a flange portion for connecting to the battery pack lower case, and generally has a top wall thickness of 2.5mm to 3mm, a side wall thickness of 3mm to 3.5mm, and a flange portion having an equal thickness and a thickness of generally 4mm to 5mm, and after assembling the upper case and the lower case by bolts, the upper case is easily cracked at the connecting position of the flange portion and the side wall due to a large stress generated at the connecting position of the flange portion and the side wall.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a casing on battery package, it can reduce the stress of lateral wall and flange portion hookup location, reduces the risk that flange portion and lateral wall hookup location take place the fracture.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
the utility model provides a battery package upper casing, includes the roof, and locates the ring of one side of roof the lateral wall that roof circumference was arranged, the roof with be formed with between the lateral wall and hold the chamber, and in keeping away from of lateral wall the limit portion of roof one side is connected with the flange portion that is used for with lower shell coupling, just the inhomogeneous setting of thickness of flange portion.
Further, the flange part comprises a flange flanging which is formed by outwards folding the edge part;
the flange flanging extends from one side close to the side wall to the other side, and the flange flanging is gradually narrowed in the thickness direction.
Furthermore, the flange flanging comprises a bottom facing the lower shell and a top facing away from the lower shell, the top extends from one side close to the side wall to the other side, the bottom is arranged flatly, and the surface of the top is inclined towards one side of the bottom.
Furthermore, the difference value between the thickness of the flange flanging at one side close to the side wall and the thickness of the flange flanging at the other side is 0.5-1.0 mm.
Further, the thickness of the flange portion on the side close to the side wall is larger than that of the side wall, and/or the thickness of the top wall is not larger than that of the side wall.
Furthermore, extend to connect from connecting flange portion one side the roof one side, the lateral wall is in the setting of narrowing gradually of self thickness direction.
Further, the side wall and the flange portion are smoothly transited, and/or the top wall and the side wall are smoothly transited.
Further, a transition fillet R formed between the side wall and the flange portion and/or between the top wall and the side wall is 93 ° to 95 °.
Furthermore, the part of the top wall is formed with a concave-convex reinforcing structure, and the wall thickness of the top wall is uniformly arranged.
Compared with the prior art, the utility model discloses following advantage has:
battery package on casing, through the inhomogeneous setting of thickness that makes flange portion, can optimize lateral wall and flange portion hookup location's stress to can reduce the hookup location's of flange portion and lateral wall stress, and then reduce casing assembly back under casing and the battery package on the battery package, the risk of fracture takes place for the hookup location of the flange portion of casing and lateral wall on the battery package.
In addition, through be formed with unsmooth additional strengthening on the roof, and make the even setting of thickness of roof can strengthen the intensity of roof, also is convenient for adopt SMC sheet compression molding technology to come convenient formation battery package upper housing.
Another object of the present invention is to provide a battery pack, wherein the battery pack has the above casing.
The utility model discloses a battery package is through disposing foretell battery package and going up the casing, can strengthen the intensity of battery package, and then reduces the battery and wraps the risk that the casing takes place the fracture, promotes the security performance of battery package.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic view of an overall structure of a battery pack upper case according to a first embodiment of the present invention;
fig. 2 is a cross-sectional view of the internal structure of the upper case of the battery pack according to the first embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a partial enlarged view of B in bitmap 1;
fig. 5 is a graph showing a stress simulation result at an R-angle position when the thickness of the flange portion of the upper case of the battery pack according to the first embodiment of the present invention is uniformly set;
fig. 6 is a graph showing a simulation result of the stress at the R-angle when the flange of the upper case of the battery pack is not uniformly thick.
Description of the reference numerals:
1. a top wall; 2. a side wall;
3. a flange portion; 301. flanging the flange; 302. mounting holes;
4. an accommodating chamber; 5. a strip-shaped groove.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", "front", "rear", "left", "right", "top", "bottom" and the like appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
The utility model relates to a casing on battery package, on overall structure, it includes roof 1 to and locate the lateral wall 2 that 1 circumference of crown wall of one side of roof 1 arranged, be formed with between roof 1 and the lateral wall 2 and hold chamber 4, and be connected with in the limit portion of keeping away from 1 one side of roof of lateral wall 2 and be used for with lower shell connection's flange portion 3, and the inhomogeneous setting of thickness of flange portion 3.
Based on the above general description, as shown in fig. 1 to 6, in the present embodiment, preferably, the top wall 1, the side wall 2 and the flange portion 3 of the upper case of the battery pack are integrally formed, so as to facilitate the improvement of the strength of the upper case of the battery pack. The top wall 1, the side wall 2, and the flange portion 3 may be joined together to form an upper case, and the top wall 1, the side wall 2, and the flange portion 3 may be joined together to form the upper case by welding, bonding, or the like.
As shown in fig. 3 and 4, the flange portion 3 includes a flange 301 folded out from the side portion. And extend to the opposite side from one side that is close to lateral wall 2, flange turn-ups 301 sets up in the narrowing gradually of self thickness direction. I.e. the flange turn-up 301 is thicker on the side near the side wall 2 and thinner on the side remote from the side wall 2.
In specific implementation, as shown in fig. 2 and 3, the flange 301 includes a bottom facing the lower case, and a top facing away from the lower case, extending from one side close to the sidewall 2 to the other side, the bottom being flat, and the surface of the top being inclined toward one side of the bottom. Through this setting, can optimize lateral wall 2 and 3 hookup location's of flange portion stress state, and then reduce flange portion 3 and 2 hookup location's of lateral wall stress to the intensity of casing on this battery package is strengthened, the risk that the casing takes place the fracture on the reduction battery package.
Further, it is preferable that the difference between the thickness of the flange 301 on the side close to the side wall 2 and the thickness on the other side is 0.5mm to 1.0 mm. If the thickness of the flange turnup 301 near the side wall 2 is 4mm, the thickness of the flange turnup 301 near the other side may be 3mm to 3.5mm, and if the thickness is 3mm, the thickness of the flange turnup 301 gradually changes from 4mm to 3mm from the side near the side wall 2 to the other side.
In addition, it is preferable that, in the present embodiment, the thickness of the flange portion 3 on the side close to the side wall 2 is larger than the thickness of the side wall 2, and the thickness of the top wall 1 is not larger than the thickness of the side wall 2. Through the thickness that makes flange portion 3 be close to one side of lateral wall 2 and lateral wall 2 thicker, and make the thickness of roof 1 thinner, can be on guaranteeing that the battery wraps under the prerequisite of casing shaping and battery package upper shell intensity, reduce the weight of casing on the battery package, realize the lightweight of casing on the battery package. By making the thickness of the flange portion 3 thick, the reliability of the connection between the battery pack upper case and the battery pack lower case can be further improved.
Of course, the thickness of the flange portion 3 on the side close to the side wall 2 may be smaller than the thickness of the side wall 2, or the thickness of the top wall 1 may be larger than the thickness of the side wall 2.
In addition, for further promoting the intensity of casing on this battery package, extend to connection roof 1 one side from flange portion 3 one side, lateral wall 2 is in the setting of narrowing gradually of self thickness direction, and the thickness that is also the one side that is connected with flange portion 3 of lateral wall 2 is thicker, and lateral wall 2 is thinner with the one side thickness that roof 1 is connected, and from down and the thickness of lateral wall 2 thins gradually down to can reduce the stress of lateral wall 2 and flange portion 3 hookup location, reduce the risk that the lateral wall 2 and the flange portion 3 hookup location of casing on the battery package took place the fracture.
In addition, in order to achieve a better connection effect between the side wall 2 and the flange portion 3 and between the top wall 1 and the side wall 2, the side wall 2 and the flange portion 3 are smoothly transited, and the top wall 1 and the side wall 2 are smoothly transited. Further, the top wall 1 and the side wall 2 or the side wall 2 and the flange portion 3 may be directly connected without being smoothly transited.
In the present embodiment, the transition fillets R formed between the side wall 2 and the flange portion 3 and between the top wall 1 and the side wall 2 are preferably 93 ° to 95 °, and may specifically take 93 °, 94 °, 95 °, or the like. It should be noted that the side wall 2 is not vertically disposed but inclined at a certain angle, so that the strength of the connecting position of the side wall 2 and the top wall 1 and the connecting position of the side wall 2 and the flange portion 3 can be improved. Meanwhile, the transition round R between the top wall 1 and the side wall 2 is not specifically indicated in the drawing, and the structure thereof is similar to the transition round R between the side wall 2 and the flange portion 3 shown in fig. 3, and thus the description thereof is omitted.
In order to further improve the strength of the upper shell of the battery pack, a concave-convex reinforcing structure is formed on the part of the top wall 1, and the wall thickness of the top wall 1 is uniformly arranged. As shown in fig. 1, the concave-convex reinforcing structure is specifically a plurality of strip-shaped grooves 5 formed on the top wall 1 and arranged at intervals along the length direction of the top wall 1, and the wall thickness of the side portions and the wall thickness of the bottom portions of the strip-shaped grooves 5 are the same as the wall thickness of the rest portions on the top wall 1.
Through making the thickness of roof 1 evenly arrange, like this, can adopt SMC sheet compression molding process, evenly spread the SMC sheet in the battery package upper housing mould, through compound die intensification mould pressing, make the material melt and produce the inside mobile even flow to the mould die cavity. In addition, since the thickness of the top wall 1 is thin, the thickness of the side portions and the bottom portions of the strip-shaped grooves 5 is made equal to the thickness of the remaining portion of the top wall 1, so that the weight of the battery pack upper case can be reduced.
In addition, to facilitate the connection between the upper case and the lower case of the battery pack, as shown in fig. 1 and 4, a plurality of mounting holes 302 are formed on the flange 301 at intervals, and the mounting holes 302 surround the circumferential arrangement of the flange 301, so as to facilitate the connection between the upper case and the lower case of the battery pack by providing the mounting holes 302.
Of course, in the utility model discloses a battery package upper casing, the thickness of each part can be selected according to actual need correspondingly, and as preferred, the size of battery package upper casing in this embodiment is roof 1 thickness 2.5mm, and 2 thickness 3mm of lateral wall, flange portion 3 are from 4mm to 3mm transition from one side to its thickness of opposite side near lateral wall 2.
In this embodiment, fig. 5 and fig. 6 are graphs showing stress simulation results after stress simulation processing of a connection position (an R corner) of a side wall 2 and a flange portion 3 of a battery pack upper case, where fig. 5 is a graph showing a stress simulation result of an R corner of a horizontal design (the flange portion 3 is arranged in an equal thickness from one side close to the side wall 2 to the other side, and the thickness is 4mm) of the top of the flange portion 3, and the stress is 53.17Mpa at this time; fig. 6 shows the simulation result of stress at the R-angle of the inclined design of the flange part 3 (in the state shown in fig. 3, the thickness of the flange part transitions from 4mm to 3mm from one side close to the side wall 2 to the other side, the bottom of the flange part is horizontal, and the top of the flange part is inclined downwards), and the stress is 38.99 Mpa.
Therefore, compared with the horizontal design of the top of the flange part 3, the stress at the corner R of the flange part 3 with the inclined top is reduced by 14.18Mpa, so that the inclined top of the flange part 3 of the battery pack upper housing of the embodiment (in the state shown in fig. 3, the thickness of the flange part is transited from 4mm to 3mm from one side close to the side wall 2 to the other side, and the inclined top is arranged downwards) can effectively reduce the stress at the connecting position of the side wall 2 and the flange part 3. In addition, in this embodiment, when performing stress simulation processing on the connection position (at the R-corner) between the side wall 2 and the flange portion 3 of the upper case of the battery pack, simulation equipment and simulation technical means commonly used by those skilled in the art are adopted, and are not described herein again.
The battery of this embodiment wraps the casing, through the inhomogeneous setting of thickness that makes flange portion 3, can optimize lateral wall 2 and the stress state of 3 hookup location of flange portion to reduce the stress of lateral wall 2 and 3 hookup location of flange portion, and then reduce the risk that lateral wall 2 and 3 hookup location department of flange portion take place the fracture.
Example two
The embodiment relates to a battery pack, and the battery pack is provided with the upper shell of the battery pack.
The battery pack of this embodiment is through disposing the battery pack upper shell of embodiment one, can strengthen the intensity of battery pack, promotes the security performance of battery pack.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A battery pack upper shell is characterized in that:
including roof (1), and locate the ring of one side of roof (1) lateral wall (2) that roof (1) circumference was arranged, roof (1) with be formed with between lateral wall (2) and hold chamber (4), and in keeping away from of lateral wall (2) the limit portion of roof (1) one side is connected with flange portion (3) that are used for with lower shell coupling, just the inhomogeneous setting of thickness of flange portion (3).
2. The battery pack upper case according to claim 1, wherein:
the flange part (3) comprises a flange flanging (301) formed by outwards folding the side part;
the flange flanging (301) is gradually narrowed in the thickness direction of the flange flanging (301) from one side close to the side wall (2) to the other side.
3. The battery pack upper case according to claim 2, wherein:
the flange flanging (301) comprises a flange flanging and a flange connecting piece, wherein the flange flanging faces the bottom of the lower shell, faces away from the top of the lower shell and extends from one side close to the side wall (2) to the other side, the bottom is arranged flatly, and the surface of the top is arranged obliquely on one side of the bottom.
4. The battery pack upper case according to claim 2, wherein:
the difference value between the thickness of one side of the flange flanging (301) close to the side wall (2) and the thickness of the other side is 0.5-1.0 mm.
5. The battery pack upper case according to claim 1, wherein:
the thickness of the flange part (3) close to the side wall (2) is larger than that of the side wall (2), and/or the thickness of the top wall (1) is not larger than that of the side wall (2).
6. The battery pack upper case according to claim 1, wherein:
extend to connect from connecting flange portion (3) one side roof (1) one side, lateral wall (2) are in the setting of narrowing gradually of self thickness direction.
7. The battery pack upper case according to claim 1, wherein:
the side wall (2) and the flange part (3) are arranged in a smooth transition mode, and/or the top wall (1) and the side wall (2) are arranged in a smooth transition mode.
8. The battery pack upper case according to claim 6, wherein:
the transition fillet R formed between the side wall (2) and the flange part (3) and/or between the top wall (1) and the side wall (2) is 93-95 degrees.
9. The battery pack upper case according to any one of claims 1 to 8, wherein:
the part of the top wall (1) is formed with a concave-convex reinforcing structure, and the wall thickness of the top wall (1) is uniformly arranged.
10. A battery pack, comprising: the battery pack upper case according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220639294.2U CN217114562U (en) | 2022-03-22 | 2022-03-22 | Battery pack upper shell and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220639294.2U CN217114562U (en) | 2022-03-22 | 2022-03-22 | Battery pack upper shell and battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217114562U true CN217114562U (en) | 2022-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220639294.2U Active CN217114562U (en) | 2022-03-22 | 2022-03-22 | Battery pack upper shell and battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217114562U (en) |
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2022
- 2022-03-22 CN CN202220639294.2U patent/CN217114562U/en active Active
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