CN217562680U

CN217562680U - Battery case and battery

Info

Publication number: CN217562680U
Application number: CN202221670303.0U
Authority: CN
Inventors: 于东朋; 刘峰; 王俊; 刘静; 夏天军; 高飞; 张放南; 杨红新
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-10-11
Anticipated expiration: 2032-06-29

Abstract

The utility model relates to a battery technology field, concretely relates to battery shell and battery. The battery shell comprises a tubular shell body, wherein openings are formed in two ends of the tubular shell body, the tubular shell body is formed by bending a heat-resistant thin plate, two sides of the heat-resistant thin plate respectively comprise edges of a first long edge and a second long edge, the first long edge is suitable for being bent and formed by the heat-resistant thin plate and the second long edge is close to and welded and fixed. The utility model provides a battery case, the tubulose casing is buckled by a heat-resisting sheet metal and is formed, can guarantee that the thickness of tubulose casing is even, and the longer heat-resisting sheet metal of accessible buckles out longer tubulose casing, and then obtains not only long and thin even tubulose casing.

Description

Battery case and battery

Technical Field

The utility model relates to a battery technology field, concretely relates to battery shell and battery.

Background

With the development of society and the increasing demand of people, new energy sources gradually leave great positions in various industries, especially in the automobile industry, and more automobile enterprises begin to research, develop and manufacture electric automobiles. As a core component and a capability source of an electric vehicle, a power battery is a focus of research in the present stage. The storage capacity of the power battery determines the driving mileage of the electric automobile, the storage unit of the power battery is a battery cell, and the safety of the power battery mainly depends on the safety of the adopted battery cell. Current power battery includes the blade battery, and the blade battery passes through structural innovation, can skip the module when in groups, has improved volume utilization by a wide margin, finally reaches the design target of packing into more electric cores in same space.

The traditional blade battery shell is mainly made of 3003 aluminum plates through processes of hot extrusion, hot stretching and the like, the length and the wall thickness of the shell cannot be lengthened and thinned, and the long and thin shell with uniform thickness is difficult to form.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to overcome the defects that the length of the casing of the blade battery in the prior art is long and the thickness of the casing is thin and uniform, thereby providing a long and thin uniform battery casing and battery.

In order to solve the problem, the utility model provides a battery shell, all have open-ended tubulose casing including both ends, the tubulose casing is buckled by a heat-resisting sheet metal and is formed, the both sides of heat-resisting sheet metal are respectively including following the first long limit and the second long limit that the length direction of tubulose casing extends, first long limit is suitable for be in after the shaping is buckled to heat-resisting sheet metal with the second long limit is close to and welded fastening.

The utility model provides a battery case, heat-resisting sheet metal is the steel sheet.

The utility model provides a battery case, steel sheet thickness delta satisfies, and 0.1mm is less than or equal to delta and is less than or equal to 0.3mm.

The utility model provides a battery case, the tubular casing is the rectangle casing of transversal personally submitting the rectangle, the cross section be with the length direction vertically cross-section of tubular casing, first long limit with the welding seam between the long limit of second is located on the lateral wall of the tubular casing at the minor face place of cross section.

The utility model provides a battery case, the width W of the minor face of the opening part of tubulose casing with the ratio W/H of the height H on the long limit of the opening part of tubulose casing satisfies, and 0.05 is not less than W/H and is not less than 0.3.

The utility model provides a battery case, the welding seam including the protrusion in the first bulge of the internal surface setting of tubulose casing.

In the battery case provided by the present invention, the end surface of the first protrusion portion facing away from the inner surface of the tubular case is a first plane, and the first plane is parallel to the inner surface of the tubular case;

the distance d between the first plane and the inner surface of the tubular shell is satisfied, and d is less than or equal to 0.08mm.

The utility model provides a battery case, the welding seam still include the protrusion in the second bulge that the surface of tubulose casing set up.

In the battery case provided by the present invention, the end surface of the second protrusion portion facing away from the outer surface of the tubular case is a second plane, and the second plane is parallel to the outer surface of the tubular case;

and the distance D between the second plane and the outer surface of the tubular shell is satisfied, and D is less than or equal to 0.1mm.

The utility model provides a battery case, first long limit with the second long limit welds fixedly through laser welding or argon arc welding, forms a sharp welding seam.

The utility model also provides a battery, including foretell battery case.

The utility model has the advantages of it is following:

1. the utility model provides a battery case, all have open-ended tubulose casing including both ends, the tubulose casing is buckled by a heat-resisting sheet metal and is formed, the both sides of heat-resisting sheet metal are respectively including following the first long limit and the second long limit that the length direction of tubulose casing extends, first long limit is suitable for be in after the shaping is buckled to heat-resisting sheet metal with the second long limit is close to and welded fastening.

The tubular shell is formed by bending a heat-resistant thin plate, so that the thickness of the tubular shell can be ensured to be uniform, and the longer tubular shell can be bent by a longer heat-resistant thin plate, so that the long and thin uniform tubular shell is obtained. Just the utility model provides a tubular casing only needs to carry out welded fastening with first long limit and the long limit of second, compares through two spaced welding seams with the length direction that needs follow tubular casing, has both simplified tubular casing's shaping step, still can reduce the area of welding seam extrusion electricity core. In addition, the sealing effect between the first long side and the second long side is also ensured.

2. The utility model discloses a battery case, heat-resisting sheet metal is the steel sheet. The steel sheet has better heat resistance for aluminum plate, prevents that electric core from leading to the casing to melt and wear to catch fire because of thermal runaway, and still can reduce the wall thickness of tubulose casing, has effectively increased the inside space that holds electric core of tubulose casing, has increased the space that holds active material, has improved electric core volume energy density.

3. The utility model discloses a battery case, the tubular casing is the rectangle casing of transversal personally submitting the rectangle, the cross section be with the length direction vertically cross-section of tubular casing, first long limit with the welding seam between the second long limit is located on the side at the minor face place of cross section. The welding seam is arranged on the side wall of the tubular shell where the short edge of the cross section is located, the welding seam is located on the side portion of the battery cell, and potential safety hazards caused by the fact that the welding bulge at the welding seam extrudes the large surface of the battery cell are avoided.

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

Figure 1 shows a schematic view of a tubular housing of the invention;

figure 2 shows a front view of the tubular housing of the present invention;

figure 3 shows a top view of the tubular housing of the present invention;

fig. 4 shows a left side view of the tubular housing of the present invention;

fig. 5 shows an enlarged view of a portion a of fig. 4.

Description of reference numerals:

1. a tubular housing; 2. welding seams; 3. a first projecting portion; 31. a first plane; 4. a second projection; 41. a second plane.

Detailed Description

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

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships 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 terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 5, in the present embodiment, a battery case is disclosed, which includes a tubular case 1 having openings at both ends, the tubular case 1 is formed by bending a heat-resistant thin plate, both sides of the heat-resistant thin plate respectively include a first long side and a second long side extending along a length direction of the tubular case 1, and the first long side is suitable for being close to and welded and fixed to the second long side after the heat-resistant thin plate is bent and formed. Specifically, the battery case in the present embodiment may be a case of a blade battery, or may be a case of another battery that needs to be long and thin.

In a specific embodiment, the battery case further includes a first cover plate and a second cover plate, the first cover plate and the second cover plate are connected to openings at two ends of the tubular case 1, after the tubular case 1 is formed, flaring shaping can be performed at the openings at two ends of the tubular case 1 through a standard die, and the length, width and included angle tolerance is controlled within a range of ± 0.15. The battery cell is suitable for being arranged inside the battery shell, the two ends of the battery cell are respectively provided with a positive electrode lug and a negative electrode lug, and the first cover plate and the second cover plate are suitable for being respectively connected with the positive electrode lug and the negative electrode lug. The length L of the tubular shell 1 can meet the requirement that L is more than or equal to 300mm and less than or equal to 2000mm, and the manufacturing yield of the tubular shell 1 and the optimal structure of the battery cell are guaranteed.

The tubular shell 1 is formed by bending a heat-resistant thin plate, so that the thickness of the tubular shell 1 is uniform, and the longer tubular shell 1 can be bent by a longer heat-resistant thin plate, so that the long and thin uniform tubular shell 1 is obtained. Just the utility model provides a tubular casing 1 only needs to carry out welded fastening with first long limit and the long limit of second, compares with the length direction that needs follow tubular casing 1 through 2 welding of two spaced welding seams, has both simplified tubular casing 1's shaping step, still can reduce the area of 2 extrusion electric cores of welding seam. In addition, the sealing effect between the first long side and the second long side is also ensured.

In this embodiment, the heat-resistant sheet is a steel sheet. The steel sheet has better heat resistance for aluminum plate, prevents that electric core from leading to the casing to melt and wear to catch fire because of thermal runaway, and still can reduce the wall thickness of tubulose casing 1, has effectively increased the inside space that holds electric core of tubulose casing 1, has increased the space that holds active material, has improved electric core volume energy density. In this embodiment, the heat-resistant sheet is preferably a steel sheet having a melting point of more than 1000 ℃, such as SUS304 or SPCC.

In an alternative embodiment, the heat-resistant thin plate may be a copper plate. The copper has better heat resistance for aluminum plate, prevents that electric core from leading to the casing to melt and wear to catch fire because of thermal runaway, and still can reduce the wall thickness of tubulose casing 1, has effectively increased the inside space that holds electric core of tubulose casing 1, has increased the space that holds active material, has improved electric core volume energy density.

In the embodiment, the thickness delta of the steel plate satisfies that delta is more than or equal to 0.1mm and less than or equal to 0.3mm. The wall thickness of the tubular shell 1 is thin, so that the space for accommodating the battery cell in the tubular shell 1 is effectively increased, the space for accommodating active substances is increased, and the volume energy density of the battery cell is improved.

In a particular embodiment of this example, the thickness δ of the steel plate is 0.1mm.

In another particular embodiment of this embodiment, the thickness δ of the steel plate is 0.3mm.

In this embodiment, the tubular housing 1 is a rectangular housing having a rectangular cross section, the cross section is a section perpendicular to the length direction of the tubular housing 1, and the weld 2 between the first long side and the second long side is located on the side where the short side of the cross section is located. The welding line 2 is arranged on the side wall of the tubular shell 1 where the short side of the cross section is located, the welding line 2 is located on the side portion of the battery cell, and potential safety hazards caused by the fact that the welding protrusions at the welding line 2 extrude the large face of the battery cell are avoided. Four edges of the tubular shell 1 are in smooth transition.

In the embodiment, the ratio W/H of the width W of the short side at the opening of the tubular shell 1 to the height H of the long side at the opening of the tubular shell 1 satisfies that W/H is more than or equal to 0.05 and less than or equal to 0.3. The welding and strength of the tubular shell 1 can be in a better state.

In one embodiment, the ratio W/H of the width W of the short side at the opening of the tubular housing 1 to the height H of the long side at the opening of the tubular housing 1 is 0.05.

In one embodiment, the ratio W/H of the width W of the short side at the opening of the tubular housing 1 to the height H of the long side at the opening of the tubular housing 1 is 0.3.

In this embodiment, the welding seam 2 includes a first protrusion 3 protruding from the inner surface of the tubular housing 1. The first projecting portion 3 can secure welding strength and sealability at the weld 2.

In this embodiment, an end surface of the first protruding portion 3 facing away from the inner surface of the tubular housing 1 is a first plane 31, and the first plane 31 is parallel to the inner surface of the tubular housing 1; the distance d between the first plane 31 and the inner surface of the tubular shell 1 is satisfied, and d is less than or equal to 0.08mm. The welding strength and the sealing performance at the welding seam 2 can be guaranteed to be optimal, and the insulating diaphragms inside and outside the battery cell in the tubular shell 1 can be guaranteed not to be scratched to cause risks. In particular, the distance d between the first plane 31 and the inner surface of the tubular housing 1 is 0.08mm. The first projecting portion 3 may be a rectangular projection having a rectangular cross section, or a rectangular projection having a trapezoidal cross section. As an alternative embodiment, an end surface of the first protruding portion 3 facing away from the inner surface of the tubular casing 1 may be a curved surface, so as not to cause excessive damage to the battery cell inside the tubular body.

In this embodiment, the welding seam 2 further includes a second protruding portion 4 protruding from the outer surface of the tubular casing 1. The second projecting portion 4 can secure the welding strength and the sealability at the weld 2.

In this embodiment, the end surface of the second protruding portion 4 facing away from the outer surface of the tubular housing 1 is a second plane 41, and the second plane 41 is parallel to the outer surface of the tubular housing 1; the distance D between the second plane 41 and the outer surface of the tubular shell 1 is satisfied, and D is less than or equal to 0.1mm. Not only can the best welding strength and the best sealing performance of the welding seam 2 be ensured, but also the tubular shell 1 can be ensured not to be excessively protruded, the tubular shell 1 is ensured to have better appearance, and excessive assembly space can not be occupied. In particular, the distance D between the second plane 41 and the outer surface of the tubular housing 1 is 0.1mm. The second projecting portion 4 may be a rectangular projection having a rectangular cross section, or a rectangular projection having a trapezoidal cross section. As an alternative embodiment, the end surface of the second projecting portion 4 facing away from the outer surface of the tubular housing 1 may be a curved surface, so as not to cause excessive damage to other structures outside the tubular body.

In this embodiment, the first long side and the second long side are welded and fixed through laser welding or argon arc welding to form a linear welding seam 2.

The embodiment also provides a battery, which comprises the battery shell.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. The utility model provides a battery case, characterized in that, includes that both ends all have open-ended tubulose casing (1), tubulose casing (1) is formed by a heat-resisting sheet metal bending, the both sides of heat-resisting sheet metal include respectively along first long limit and the second long limit that the length direction of tubulose casing (1) extends, first long limit is suitable for heat-resisting sheet metal bending after-forming with the second long limit is close to and welded fastening.

2. The battery case according to claim 1, wherein the heat-resistant sheet is a steel sheet.

3. The battery case according to claim 2, wherein the thickness δ of the steel plate satisfies 0.1mm δ 0.3mm.

4. A battery housing according to any of claims 1-3, characterized in that the tubular housing (1) is a rectangular housing with a rectangular cross section, the cross section being a section perpendicular to the length direction of the tubular housing (1), the weld seam (2) between the first and second long sides being located on the side wall of the tubular housing (1) where the short side of the cross section is located.

5. The battery case according to claim 4, wherein a ratio W/H of a width W of a short side at the opening of the tubular case (1) to a height H of a long side at the opening of the tubular case (1) satisfies 0.05. Ltoreq. W/H.ltoreq.0.3.

6. A battery case according to claim 4, characterized in that the weld seam (2) comprises a first bulge (3) provided protruding from the inner surface of the tubular case (1).

7. The battery case according to claim 6, wherein an end surface of the first projection (3) facing away from the inner surface of the tubular case (1) is a first plane (31), the first plane (31) being disposed in parallel with the inner surface of the tubular case (1);

the distance d between the first plane (31) and the inner surface of the tubular shell (1) is satisfied, and d is less than or equal to 0.08mm.

8. A battery housing according to claim 4, characterized in that the weld seam (2) further comprises a second protrusion (4) provided protruding from the outer surface of the tubular housing (1).

9. The battery case according to claim 8, wherein an end face of the second projection (4) facing away from the outer surface of the tubular case (1) is a second plane (41), the second plane (41) being disposed in parallel with the outer surface of the tubular case (1);

the distance D between the second plane (41) and the outer surface of the tubular shell (1) meets, and D is less than or equal to 0.1mm.

10. A battery comprising a battery case according to any one of claims 1 to 9.