CN212277320U

CN212277320U - Battery packaging assembly, power battery and automobile

Info

Publication number: CN212277320U
Application number: CN202021190398.7U
Authority: CN
Inventors: 段平安; 王信月; 邓洞军; 朱海莉
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-01-01
Anticipated expiration: 2030-06-22

Abstract

The utility model provides a encapsulation subassembly, power battery and car of battery, encapsulation subassembly includes casing, apron and sealing member, and the apron lid is located the casing and is held the chamber in order forming, and the apron has been seted up and has been annotated the liquid hole, annotates the liquid hole and is used for injecting electrolyte into the casing, and the sealing member is located annotate the liquid hole and is fixed in order to seal the appearance chamber with the cover connection, and the surface that the chamber was held to the sealing member dorsad is the first surface, and the dashpot has been seted up on the first surface, and the dashpot is used for. Through set up the dashpot on the sealing member, when sealing member and apron welding, welding stress can release through the dashpot to avoid welding stress to cause the welding seam fracture, guaranteed welding seam yield and reliability.

Description

Battery packaging assembly, power battery and automobile

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a encapsulation subassembly, power battery and car of battery.

Background

With the development of battery technology, batteries such as lithium batteries and lead storage batteries are more and more widely applied, and people have higher and higher requirements on the safety of the batteries, particularly the packaging process of the batteries.

In the packaging process, the liquid injection hole is sealed after the electrolyte is injected, so that the electrolyte is isolated from the outside. At present, sealing pieces such as sealing nails or sealing sheets are usually adopted to be combined and welded to seal the liquid injection hole, but due to the existence of welding stress, a welding seam is easy to crack, the sealing of the liquid injection hole is ineffective, and the reliability is low.

Therefore, how to eliminate the welding stress of the sealing member becomes a key for improving the yield and reliability of the welding seam.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a encapsulation subassembly, power battery and the car of battery has higher welding seam yield and reliability.

For realizing the purpose of the utility model, the utility model provides a following technical scheme:

in a first aspect, the utility model provides a battery packaging assembly, packaging assembly include casing, apron and sealing member, the apron lid is located the casing is in order to form and hold the chamber, the apron has been seted up and has been annotated the liquid hole, annotate the liquid hole be used for to casing injection solution, the sealing member is located annotate the liquid hole and with the cover connection is fixed in order to seal hold the chamber, the sealing member dorsad the surface that holds the chamber is the first surface, the dashpot has been seted up on the first surface, the dashpot is used for the buffering the sealing member with the stress that produces when the cover connection is fixed.

In one embodiment, the buffer grooves are connected end to form a ring shape, and the shape of the buffer grooves corresponds to the outer peripheral profile of the sealing member.

In one embodiment, a shape of a bottom surface of the buffer groove corresponds to a shape of the first surface.

In one embodiment, the number of the buffer slots is multiple, and the multiple annular buffer slots are concentrically arranged and parallel to each other.

In one embodiment, in the extending direction of the buffer slot, the cross section of the buffer slot is trapezoidal, the side of the trapezoid away from the first surface is an upper bottom, the side of the trapezoid connected with the first surface is a lower bottom, and the length of the lower bottom is greater than that of the upper bottom.

In one embodiment, the sealing member includes sealed lid and sealed nail, sealed lid with sealed nail all locates annotate the liquid hole, sealed lid is located sealed nail dorsad the one side of holding the chamber, sealed nail with annotate liquid hole interference fit and be connected and fixed, sealed lid with sealed nail has the spacing distance, first surface is sealed lid dorsad the surface of sealed nail.

In one embodiment, the sealing cover comprises a second surface and a connecting surface, the second surface is opposite to the first surface, the connecting surface connects the first surface and the second surface, the included angle between the second surface and the connecting surface ranges from 95 degrees to 150 degrees, the liquid injection hole comprises a bottom wall and a peripheral wall which are connected with each other, the bottom wall is attached to the second surface, and the peripheral wall is attached to the connecting surface.

In one embodiment, the sealing element includes a fixing portion and a connecting portion, the fixing portion is disposed on a side of the connecting portion facing away from the cavity, the first surface is a surface of the fixing portion facing away from the connecting portion, and the connecting portion is fixed to the liquid injection hole in an interference manner.

In a second aspect, the present invention further provides a power battery, wherein the power battery comprises an electrolyte and the packaging assembly of any one of the embodiments of the first aspect, and the electrolyte is disposed in the cavity of the packaging assembly.

The third aspect, the utility model also provides an automobile, the automobile includes the power battery of second aspect.

The utility model provides a encapsulation subassembly, through set up the dashpot on the sealing member, when sealing member and apron welding, welding stress can pass through the dashpot release to avoid welding stress to cause the welding seam fracture, guaranteed welding seam yield and reliability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of an embodiment of a package assembly in an exploded condition;

FIG. 2 is an enlarged schematic view of a portion of the package assembly of FIG. 1;

FIG. 3 is an enlarged partial cross-sectional schematic view of the package assembly of FIG. 1 removed from an exploded condition;

FIG. 4 is a schematic top view of the seal of FIG. 1;

FIG. 5 is a schematic top view of a seal according to one embodiment;

FIG. 6 is a schematic top view of a seal according to another embodiment;

FIG. 7 is a perspective view of the sealing lid of FIG. 1;

FIG. 8 is a schematic perspective view of the seal cap of FIG. 1 from another perspective;

FIG. 9 is a cross-sectional structural schematic view of the seal cap of FIG. 1;

fig. 10 is a perspective view of a seal according to another embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

Referring to fig. 1 to 3, an embodiment of the present invention provides a battery packaging assembly, which is mainly applied to an electrolyte battery such as a lithium battery and a lead storage battery. The packaging assembly comprises a shell 10, a cover plate 20 and a sealing element 30, wherein the cover plate 20 is arranged on the shell 10 in a covering mode to form a containing cavity 101. The lid 20 is opened with a liquid inlet 201, and the liquid inlet 201 is used for injecting the electrolyte into the case 10. The sealing element 30 is arranged on the liquid injection hole 201 and is fixedly connected with the cover plate 20 to close the cavity 101, and the surface of the sealing element 30, which is opposite to the cavity 101, is a first surface 301. The first surface 301 is provided with a buffer slot 3011, and the buffer slot 3011 is used for buffering the stress generated when the sealing element 30 is connected and fixed with the cover plate 20.

Specifically, the case 10 and the cover plate 20 are preferably made of an aluminum alloy having high corrosion resistance and high strength. The sealing member 30 is fixedly coupled to the cap plate 20 by welding. It will be appreciated that when the seal 30 is welded to the cover plate 20, the welding stress is mainly concentrated at the edge of the first surface 301 of the seal 30 facing away from the cavity 101. The buffer groove 3011 is provided on the first surface 301, and can maximally release the welding stress. The less the residual welding stress of the sealing member 30, the lower the possibility of weld cracking, and the improved weld yield, thereby improving the reliability of the battery. For the rear ring section of the battery, if poor welding occurs due to the sealing member 30, the battery is easily scrapped and a large loss is caused.

Through seting up dashpot 3011 on sealing member 30, when sealing member 30 and apron 20 welded, welding stress can release through dashpot 3011 to avoid welding stress to cause the welding seam fracture, guaranteed welding seam yield and reliability, be favorable to reducing the cost of battery manufacturing.

In one embodiment, referring to fig. 4, the buffer slot 3011 is in a ring shape and communicates end to end, and the shape of the buffer slot 3011 corresponds to the outer peripheral profile of the sealing member 30. Specifically, the outer peripheral profile of the seal 30 is annular, and the buffer grooves 3011 are annular in shape and communicate end to end. The sealing member 30 having an annular outer peripheral profile overlaps the buffer groove 3011 at the center of the circle. In some embodiments, the outer peripheral profile of the sealing member 30 may have other shapes such as a square shape, an oval shape, etc., for example, when the outer peripheral profile of the sealing member 30 has a square shape, the buffer slot 3011 has a corresponding square shape. The shape through setting up dashpot 3011 corresponds with the periphery profile of sealing member 30, and dashpot 3011 communicates end to end and is cyclic annular for the welding stress homoenergetic of each position at first surface 301 edge obtains the release through dashpot 3011, is favorable to welding stress release complete, further improves welding seam yield and reliability.

In one embodiment, referring to fig. 5, the number of the buffer slots 3011 is multiple, and the plurality of ring-shaped buffer slots 3011 are concentrically arranged and parallel to each other. Specifically, the number of the buffer slots 3011 may be 2, 3, or more than 3, and preferably 2. As shown, the buffer slot 3011 includes a first buffer slot 30113 and a second buffer slot 30114, and the first buffer slot 30113 and the second buffer slot 30114 are concentrically arranged and parallel to each other. By arranging the plurality of buffer slots 3011, the effect of eliminating welding stress of the buffer slots 3011 is further improved, and the concentric arrangement can ensure that the sealing element 30 has enough strength to seal the liquid injection hole 201 when the buffer slots 3011 are opened.

In one embodiment, referring to fig. 6, the bottom surface 30111 of the buffer slot 3011 has a shape corresponding to the shape of the first surface 301. Specifically, the bottom surface 30111 of the buffer slot 3011 and the first surface 301 are both circular, and the circle centers of the circular bottom surface 30111 of the buffer slot 3011 and the circular first surface 301 coincide. In other embodiments, the first surface 301 and the bottom surface 30111 of the buffer slot 3011 may have other shapes such as a square shape and an oval shape. By arranging the shape of the bottom surface 30111 of the buffer slot 3011 to correspond to the shape of the first surface 301, the buffer slot 3011 can completely release the welding stress, thereby improving the welding yield and reliability.

In one embodiment, referring to fig. 7 and 9, the cross section of the buffer slot 3011 is trapezoidal in the extending direction of the buffer slot 3011. The side of the trapezoid away from the first surface 301 is an upper base 30117, and the side of the trapezoid connected to the first surface 301 is a lower base 30116. The lower base 30116 has a length greater than the length of the upper base 30117. Specifically, the cross section of the buffer slot 3011 is isosceles trapezoid. It will be understood that the two parallel sides of the trapezoid are the bottom sides, the longer bottom side is generally referred to as the bottom side, and the shorter bottom side is generally referred to as the top side. The cross section of the trapezoidal buffer slot 3011 can facilitate the buffer slot 3011 to release the welding stress more comprehensively, so as to avoid the influence of the residual welding stress on the quality of the welding seam.

In one embodiment, referring to fig. 3, the sealing member 30 includes a sealing cap 31 and a sealing nail 32, and both the sealing cap 31 and the sealing nail 32 are disposed on the injection hole 201. The sealing cover 31 is arranged on one side of the sealing nail 32 back to the cavity 101, and the sealing nail 32 is in interference connection with the liquid injection hole 201 for fixation. The sealing cap 31 and the sealing nail 32 have a spaced distance. The first surface 301 is the surface of the sealing cap 31 facing away from the sealing nail 32. Specifically, the sealing nail 32 includes a retaining nail 321 and a fixing sleeve 322, and the fixing sleeve 322 is sleeved on an end of the retaining nail 321 and fixed relatively. The fixing sleeve 322 is made of elastic material such as rubber, so that the fixing sleeve 322 is interference-connected with the cover plate 20. The pour hole 201 is a stepped hole, and the sealing lid 31 and the sealing nail 32 are placed on different bottom surfaces of the stepped hole such that a separation distance is provided between the sealing lid 31 and the sealing nail 32. Referring to fig. 8 and 9, the sealing cover 31 is further provided with an avoiding groove 3201, and the avoiding groove 3201 can accommodate a deformed portion of the sealing nail 32 to prevent the deformation of the sealing nail 32 from affecting the position of the sealing cover 31, thereby improving the position accuracy of the sealing cover 31.

In one embodiment, referring to fig. 3 and 9, the sealing cap 31 includes a second surface 302 and a connecting surface 303. The second surface 302 is opposite to the first surface 301, and the connection surface 303 connects the first surface 301 and the second surface 302. The second surface 302 and the connecting surface 303 are angled in the range of 95 to 150. The liquid filling hole 201 comprises a bottom wall 2011 and a peripheral wall 2012 which are connected with each other, wherein the bottom wall 2011 is attached to the second surface 302, and the peripheral wall 2012 is attached to the connecting surface 303. Specifically, the included angle between the second surface 302 and the connection surface 303 may be 95 °, 110 °, 124 °, 140 °, 150 °, and the like. By arranging the included angle between the second surface 302 and the connecting surface 303 to be 95-150 degrees, the sealing cover 31 is conveniently matched and connected with the liquid injection hole 201, and meanwhile, welding stress generated during welding can be guided to the buffer groove 3011 to be released, so that the welding seam yield and reliability can be improved.

In one embodiment, referring to fig. 3 and 10, the sealing element 30 includes a fixing portion 310 and a connecting portion 320 connected to each other, and the fixing portion 310 is disposed on a side of the connecting portion 320 facing away from the cavity 101. The first surface 301 is a surface of the fixing portion 310 opposite to the connecting portion 320, and the connecting portion 320 is fixed to the injection hole 201 by interference. Specifically, the edge of the surface of the connecting portion 320 facing away from the fixing portion 310 is provided with a rounded corner to facilitate the insertion of the sealing member 30 into the pour hole 201. By arranging the fixing part 310 and the connecting part 320, the fixing part 310 is welded with the cover plate 20, and the connecting part 320 is in interference connection with the cover plate 20, so that the sealing element 30 is in fit connection with the liquid injection hole 201.

Referring to fig. 1, an embodiment of the present invention further provides a power battery, where the power battery is mainly applied to a new energy vehicle. The power battery includes electrolyte (not shown) and the utility model provides a encapsulation subassembly, and the appearance chamber 101 of encapsulation subassembly is located to the electrolyte. Specifically, the electrolyte is injected into the cavity through the injection hole 201. Through adding in power battery the utility model provides a encapsulation subassembly, power battery have the security of preferred, are favorable to improving power battery's life.

The embodiment of the utility model provides a still provide an automobile, the car is preferably new energy automobile such as hybrid vehicle, pure electric vehicles, solar automobile. The car includes the utility model provides a power battery. Through adding in the car the utility model provides a power battery, car have the security of preferred.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a encapsulation subassembly of battery, its characterized in that, includes casing, apron and sealing member, the apron lid is located the casing is in order to form and holds the chamber, the apron has been seted up and has been annotated the liquid hole be used for to the casing pours into electrolyte into, the sealing member is located annotate the liquid hole and with cover connection is fixed in order to seal hold the chamber, the sealing member dorsad the surface that holds the chamber is the first surface, the dashpot has been seted up on the first surface, the dashpot is used for the buffering the sealing member with the stress that produces when cover connection is fixed.

2. The package of claim 1, wherein the buffer slots are in an annular shape in end-to-end communication, the buffer slots having a shape corresponding to the outer peripheral profile of the seal.

3. The package assembly of claim 2, wherein the number of the buffer trenches is plural, and a plurality of the ring-shaped buffer trenches are concentrically arranged and parallel to each other.

4. The package assembly of claim 2, wherein in the extending direction of the buffer slot, the cross section of the buffer slot is trapezoidal, the side of the trapezoid away from the first surface is an upper bottom, the side of the trapezoid connected with the first surface is a lower bottom, and the length of the lower bottom is greater than that of the upper bottom.

5. The package assembly of claim 1, wherein a shape of a bottom surface of the buffer trench corresponds to a shape of the first surface.

6. The packaging assembly of any one of claims 1 to 5, wherein the sealing member includes a sealing cover and a sealing nail, the sealing cover and the sealing nail are both disposed on the liquid injection hole, the sealing cover is disposed on a side of the sealing nail facing away from the cavity, the sealing nail is fixed to the liquid injection hole in an interference fit manner, the sealing cover and the sealing nail have a spacing distance, and the first surface is a surface of the sealing cover facing away from the sealing nail.

7. The package assembly of claim 6, wherein the sealing cover includes a second surface opposite the first surface and a connecting surface connecting the first surface and the second surface, the second surface and the connecting surface having an included angle in a range of 95 ° to 150 °, the liquid injection hole includes a bottom wall and a peripheral wall connected to each other, the bottom wall is attached to the second surface, and the peripheral wall is attached to the connecting surface.

8. The package assembly of any one of claims 1 to 5, wherein the sealing member includes a fixing portion and a connecting portion, the fixing portion is disposed on a side of the connecting portion facing away from the cavity, the first surface is a surface of the fixing portion facing away from the connecting portion, and the connecting portion is fixed by interference connection with the liquid injection hole.

9. A power cell comprising an electrolyte and the packaging of any of claims 1 to 8, wherein the electrolyte is disposed within the cavity of the packaging.

10. An automobile, characterized by comprising the power battery according to claim 9.