CN208889725U - Square casing and its secondary cell - Google Patents

Abstract

The utility model provides a kind of square casing and its secondary cell, wherein square casing includes bottom wall and peripheral wall, the bottom wall and the peripheral wall are welded and fixed, the peripheral wall include two it is opposite it is main while and with it is described main while adjacent two opposite sides, at least one in the main side and the side has a weld seam intersected with the bottom wall, the thickness of the main side and the side all≤0.6mm.The thickness of the main side of the peripheral wall of the utility model square casing and side all≤0.6mm, it is namely relatively thin square casing, by the way that weld seam is arranged on main side or side, it can be made into relatively thin square casing by welding fabrication, because of the thickness without needing to increase square casing as drawing and forming, sacrifices gravimetric energy density and be just achieved；Furthermore the presence of weld seam can be such that the intensity of square casing improves, for the square casing of elongated stripe shape, it is particularly important that square casing intensity is improved by this weld seam.

Description

Square casing and its secondary cell

Technical field

The utility model relates to energy storage instrument field more particularly to a kind of square casings and its secondary cell.

Background technique

The driving power of modern society, more and more electric tools and the new energy vehicles is towards high capacity, Gao An The direction of full property is developed, and battery is widely used in electric tool and the new energy vehicles with good characteristics such as its high capacity In.These batteries should also have good safety to can be only achieved the standard used and meet people other than with high capacity Demand.

The metal shell of current secondary cell mostly uses the drawing process of plate and is made, the peripheral wall of manufactured shell To enclose the integrated formed structure set, this technique is easier to realize and waste of material is few, thus is constantly subjected to pursuing for industry.And with Secondary cell more and more tends to the development of large scale power battery, for larger size secondary cell according to drawing process And obtain enclosing the integrated formed structure set, then the peripheral wall of secondary cell needs to be arranged thicker, typically larger than 0.6mm, and thicker Shell will be substantially reduced the gravimetric energy density of secondary cell, for the secondary electricity for needing the power vehicle for mitigating weight bearing to use It is a huge challenge for pond.

Therefore, it is badly in need of providing the new shell structure of one kind or technique is made to solve the above problem of secondary cell shell.

Utility model content

The purpose of this utility model is that providing a kind of square casing and its secondary electricity in view of the deficiencies of the prior art Pond, can not also reduce the gravimetric energy density of secondary cell while being able to satisfy large scale battery use, and shell also can be improved The intensity of body.

To achieve the above object, on the one hand the utility model provides a kind of square casing, including bottom wall and peripheral wall, described Bottom wall and the peripheral wall are welded and fixed, the peripheral wall include two it is opposite it is main while and with it is described main while adjacent two it is opposite Side, at least one in the main side and the side have the weld seam intersected with the bottom wall, the main side and the side The thickness on side all≤0.6mm, preferably 0.3~0.6mm.

Further, two that the side length parallel with the bottom wall is at least with the vertical side length of the bottom wall on the main side Times, the side length >=310mm on the main side vertical with the bottom wall, the side length on the main side parallel with the bottom wall >= 150mm.Such square casing is the slender type quadrangular shell of large scale (space is biggish), is difficult to using drawing process system At, but can by relatively thin plate is enclosed set after be welded, i.e., at least one in main side and side has The weld seam intersected with bottom wall, thus this slender type quadrangular shell because peripheral wall it is relatively thin so gravimetric energy density with higher, Space it is big thus volume energy density it is also high, and the intensity of shell can be improved in the weld seam of elongate strip.

Further, the side length >=26mm parallel with the bottom wall of the side.

Further, the weld seam is 0.5~3mm along the side length being parallel on the bottom wall direction.Side length be 0.5~ The weld seam of 3mm can not only guarantee weld strength but also will not occupy excessive peripheral wall size and influence the leakproofness of peripheral wall.

Further, the weld seam is set at least one described side and vertical with the bottom wall, and the weld seam is to each The edge that the distance on the main side accounts for the side is parallel to 1/4~3/4 of the side length on the bottom wall direction.Weld seam may be disposed at One side also can be set in two sides.If being set to a side, for thin slice is bent squarely and in side shape At there is gap, welding is carried out to form weld seam in gap location；If being set to two sides, it is in for thin slice is bent into two The symmetric body of mirror image, then squarely two symmetric bodies is combined, and be all formed with gap in two sides, it is welded in gap location It connects to form two weld seams.The edge that the distance on weld seam to each main side accounts for side be parallel to side length on bottom wall direction 1/4~ 3/4, then it is easier to realize welding, and can avoid the problem of faulty soldering occurred when side is welded with the place of docking on main side.

Alternatively, the weld seam is set at least one described main side and, the weldering vertical with the bottom wall The distance for being sewn to each side accounts for the edge on the main side and is parallel to 1/4~3/4 of side length on the bottom wall direction.Similarly Weld seam may be disposed at a main side, also can be set in two main sides.

Further, the main side and the side joint are fillet, and the angle R of the fillet is 0 angle≤1.1 < R.If Be set to fillet square casing can be contained in square casing closer in conjunction with battery core, prevent the wave of square casing internal volume Take, the volume energy density of secondary cell can be improved.

Further, the bottom wall is provided with the different first thickness of size and the second thickness in the direction towards the peripheral wall Degree, and the first thickness size is greater than the second thickness to be equipped with step in the two intersection, the peripheral wall welding is solid Due to the step, further, the size of the first thickness is at least 2 times of the size of second thickness.Bottom is welded It connects and is fixed on step, it is more firm to may make that bottom wall is welded with peripheral wall, compactness is more preferable.

On the other hand the utility model additionally provides a kind of secondary cell, the shell including top cover, battery core and receiving battery core, The shell is square casing above-mentioned, and the square casing is welded and fixed with the top cover.

The technical effect of the utility model are as follows: using the peripheral wall of square casing main side and side thickness all≤0.6mm, It is namely relatively thin square casing, and by the way that weld seam is arranged on main side or side, it can be prepared by by welding fabrication relatively thin Square casing, because without need to increase square casing as drawing and forming thickness sacrifice gravimetric energy density be just able to It realizes；Furthermore the presence of weld seam can be such that the intensity of square casing improves, for the square casing of elongated stripe shape, welded by this The intensity stitched and improve square casing is particularly important.

Detailed description of the invention

Fig. 1 is the schematic diagram of the secondary cell of the utility model.

Fig. 2 is the signal explosive view of the secondary cell of the utility model.

Fig. 3 is a schematic diagram of the square casing of the utility model.

Fig. 4 is a variation diagram of Fig. 3.

Fig. 5 is the another variation diagram of Fig. 3.

Fig. 6 is the enlarged drawing of encircled portion in Fig. 1.

Fig. 7 is the peripheral wall of the square casing of the utility model and the cross-sectional view of bottom wall joint.

Specific embodiment

Illustrate the square casing and its secondary cell of the utility model in conjunction with attached drawing below.

Referring to Fig.1~2, secondary cell 100 includes top cover 3, battery core (not shown) and the square casing for accommodating battery core 1, the secondary cell electrolyte (not shown) of infiltration battery core is marked in square casing 1, top cover 3 is equipped with and is electrically connected battery core Positive plate and negative electrode tab positive terminal 31 and negative terminal 33.

Referring to Fig.1~6, square casing 1 includes bottom wall 11 and peripheral wall 13, and peripheral wall 13 includes two opposite 131 Hes of main side The opposite side 133 of two adjacent with main side 131, the side length vertical with bottom wall 11 on main side 131 are at least flat with bottom wall 11 Twice of capable side length, the side length >=310mm on the main side 131 vertical with bottom wall 11, the side length on the main side 131 parallel with bottom wall 11 >=150mm, the side length >=26mm parallel with bottom wall 11 of side 133 constitute a slender type quadrangular shell.Main side 131 With the thickness of side 133 all≤0.6mm, that is to say, that be relatively thin square casing.

Referring to Fig.1~6, at least one in main side 131 and side 133 has the weld seam 7 intersected with bottom wall 11, i.e. weld seam 7 can be located on main side 131 or be located on side 133.As shown in Fig. 1~2 and Fig. 6, weld seam is located at a side 133 On, as shown in figure 3, weld seam 7 is located on a main side 131, as shown in figure 4, weld seam 7 is located on another main side 131, weld certainly Seam 7 may be a plurality of, as shown in figure 5, weld seam 7 is located on two sides 133 simultaneously.Weld seam 7 intersects with bottom wall 11, preferably , weld seam 7 is perpendicular to bottom wall 11, as shown in figs. 1 to 6.Weld seam 7 is 0.5~3mm along the side length being parallel on 11 direction of bottom wall, When weld seam 7 is set to side 133, the edge that the distance on weld seam 7 to each main side 131 accounts for side 133 is parallel on 11 direction of bottom wall The 1/4~3/4 of side length；When weld seam 7 is set to main side 131, the edge that the distance of weld seam 7 to each side 133 accounts for main side 131 is parallel to 1/4~3/4 of side length on 11 direction of bottom wall to be easier to realize welding, and can avoid in side 133 and main side 131 The problem of faulty soldering occurred when being welded at docking.

With continued reference to Fig. 1~6, main side 131 is fillet 5 with 133 joint of side, and the angle R of fillet 5 is 0 angle≤1.1 < R, To the compactness for improving square casing 1 with being contained in square casing in conjunction with battery core, the wave of 1 internal volume of square casing is prevented Take, the volume energy density of secondary cell can be improved.

Further as shown in fig. 7, bottom wall 11 and peripheral wall 13 are welded and fixed, bottom wall 11 is provided in towards the direction of peripheral wall 13 Size different first thickness 111 and second thickness 113, and 111 size of first thickness is greater than second thickness 113 in the two Intersection is equipped with step, and the size of first thickness 111 is at least 2 times of the size of second thickness 113.

The utility model using square casing 1 peripheral wall 13 main side 131 or side 133 thickness all≤0.6mm, also Relatively thin square casing 1, and by main side 131 or side 133 be arranged weld seam 7, by welding fabrication can be prepared by compared with Thin square casing 1, because the thickness without needing to increase square casing 1 as drawing and forming sacrifices gravimetric energy density Just it is achieved；Furthermore the presence of weld seam 7 can be such that the intensity of square casing 1 improves, for elongated stripe shape square casing 1 and Speech, the intensity for improving square casing 1 by this weld seam are particularly important.

It should be pointed out that the above specific embodiment is merely to illustrate the utility model rather than limits the utility model Range, after having read the utility model, those skilled in the art are equal to the modification of the various equivalent forms of the utility model Fall into the application range defined in the appended claims.

Claims (10)

1. a kind of square casing, including bottom wall and peripheral wall, which is characterized in that the bottom wall and the peripheral wall are welded and fixed, described Peripheral wall include two it is opposite it is main while and with it is described main while adjacent two opposite sides, in the main side and the side At least one has the weld seam that intersects with the bottom wall, the thickness of the main side and the side all≤0.6mm.

2. square casing according to claim 1, which is characterized in that the side length vertical with the bottom wall on the main side is extremely It is twice of the side length parallel with the bottom wall less, the side length >=310mm on the main side vertical with the bottom wall, with the bottom Side length >=the 150mm on the parallel main side of wall.

3. square casing according to claim 1, which is characterized in that the side length parallel with the bottom wall of the side >= 26mm。

4. square casing according to claim 1, which is characterized in that the weld seam edge is parallel on the bottom wall direction Side length is 0.5~3mm.

5. square casing according to claim 1, which is characterized in that the weld seam be set at least one described side and Vertical with the bottom wall, the edge that the distance on the weld seam to each main side accounts for the side is parallel on the bottom wall direction The 1/4~3/4 of side length.

6. square casing according to claim 1, which is characterized in that the weld seam be set at least one described main side and Vertical with the bottom wall, the edge that the distance of the weld seam to each side accounts for the main side is parallel on the bottom wall direction The 1/4~3/4 of side length.

7. square casing according to claim 1, which is characterized in that the main side is fillet with the side joint, The angle R of the fillet is 0 angle≤1.1 < R.

8. square casing according to claim 1, which is characterized in that the bottom wall is arranged in towards the direction of the peripheral wall There are the first thickness and second thickness that size is different, and the first thickness size is greater than the second thickness in the two phase Step is equipped at friendship, the peripheral wall is fixedly welded on the step.

9. square casing according to claim 8, which is characterized in that the size of the first thickness is at least second thickness 2 times of size.

10. a kind of secondary cell, including top cover, battery core and the shell for accommodating battery core, which is characterized in that the shell is wanted for right 1~9 any square casing is sought, the square casing is welded and fixed with the top cover.