CN217823016U

CN217823016U - Blade battery case

Info

Publication number: CN217823016U
Application number: CN202222104913.0U
Authority: CN
Inventors: 曾志亮; 杨林
Original assignee: Changzhou Changying Precision Technology Co ltd; Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Changzhou Changying Precision Technology Co ltd; Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2022-11-15
Anticipated expiration: 2032-08-10

Abstract

The utility model relates to a blade battery shell, which comprises a plurality of side walls formed by bending plates, wherein the side walls are enclosed to form a battery accommodating cavity; the side walls comprise a first side wall formed by bending from the head end of the plate and a connecting side wall formed by bending from the tail end of the plate; the connecting side wall is overlapped on the outer side of the first side wall, a welding seam is formed at the overlapping position of the connecting side wall and the first side wall, and the connecting side wall is welded and fixed with the first side wall along the welding seam. In the utility model, the wall thickness of the welding position can be increased by overlapping the connecting side wall and the first side wall to form a welding seam, and the condition of welding through is avoided, so that the wall thickness of the plate can be thinned to about 0.3 mm; the battery shell product has the advantages of less material consumption, low requirement on the production process and good practicability.

Description

Blade battery case

Technical Field

The utility model belongs to the technical field of the blade battery, a blade battery case is related to.

Background

The blade battery can skip 'modules' when being grouped through structural innovation, so that the volume utilization rate is greatly improved, and the design goal of filling more battery cores in the same space is achieved. Compared with the traditional battery pack, the volume utilization rate of the blade battery is improved by more than 50%, namely the endurance mileage can be improved by more than 50%, and the equivalent level of the high-energy-density ternary lithium battery is achieved.

The production process of the existing blade battery shell mainly comprises two processes, one process is to form the blade battery shell through a stretching process, as shown in fig. 1, the battery shell formed by the process has no welding seam, but the blade battery shell is long and is easy to crack during stretching, so the process has high requirements on a stretching die, the wall thickness of the shell is limited by the stretching process, and the minimum limit wall thickness requirement of the battery shell in the stretching process is generally not less than 0.8mm. As shown in fig. 2, the other method is to obtain the shape of the shell of the blade battery by bending and enclosing a plate, two ends of the plate are abutted together after being enclosed to form a tailor-welded seam 191, and the plate is processed into the shell of the blade battery by performing tailor-welding on the tailor-welded seam 191, but poor phenomena such as welding through, welding hole dislocation and the like are easily generated at the tailor-welded seam 191 in the tailor-welding process; when dislocation occurs, the strength of the product is insufficient, and meanwhile, the requirement of the tailor-welding process on the limit minimum wall thickness of the plate is generally not less than 0.5mm.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a production simple process and blade battery case that minimum wall thickness is littleer.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a blade battery shell comprises a plurality of side walls formed by bending a plate, wherein a battery accommodating cavity is formed by enclosing the side walls; the side walls comprise a first side wall formed by bending from the head end of the plate and a connecting side wall formed by bending from the tail end of the plate; the connecting side wall is overlapped on the outer side of the first side wall, a welding seam is formed at the overlapping position of the connecting side wall and the first side wall, and the connecting side wall is welded and fixed with the first side wall along the welding seam.

Further, the area of the first side wall is equal to the area of the connecting side wall, and the connecting side wall completely overlaps the outer side of the first side wall.

Further, the welding seam is "U" shape, and it includes the first horizontal welding seam that forms between the terminal of panel and the link of first lateral wall and its adjacent lateral wall to and connect the both ends of lateral wall and the first vertical welding seam and the second vertical welding seam that the corresponding end of first lateral wall formed.

Further, a reinforcing welding seam is arranged at the overlapping position of the connecting side wall and the first side wall, and the reinforcing welding seams are formed after penetrating through the connecting side wall through a penetration welding process; the reinforced welding seams comprise one or more of a second transverse welding seam, a third transverse welding seam, a fourth transverse welding seam, a third vertical welding seam, a fourth vertical welding seam and a fifth vertical welding seam; the second transverse welding seam is close to the tail end of the plate, the fourth transverse welding seam is located at the position where the connecting side wall corresponds to the head end of the plate, and the third transverse welding seam is located between the second transverse welding seam and the fourth transverse welding seam; the third vertical welding line and the fifth vertical welding line are respectively positioned at two sides of the connecting side wall, and the fourth vertical welding line is positioned between the third vertical welding line and the fifth vertical welding line.

Further, the wall thickness of the plate is 0.3mm.

Furthermore, the plurality of side walls further comprise a second side wall, a third side wall and a fourth side wall which are formed by bending the plate, the first side wall and the third side wall are oppositely arranged, and the second side wall and the fourth side wall are oppositely arranged; the two ends of the second side wall are respectively connected with the first side wall and the third side wall, one end of the fourth side wall is connected with the third side wall, and the other end of the fourth side wall is connected with the connecting side wall.

Further, the area of the first side wall is smaller than or equal to the area of the other side walls.

Further, the side wall opposite to the first side wall is provided with an explosion-proof notch.

Furthermore, the explosion-proof nicks comprise left nicks, right nicks and connecting nicks, the left nicks and the right nicks are symmetrically arranged, one ends of the connecting nicks are located in the middle of the left nicks, and the other ends of the connecting nicks are located in the middle of the right nicks; the upper half parts of the left nick and the right nick surround with the connecting nick to form a first rollover part, and the lower half parts of the left nick and the right nick surround with the connecting nick to form a second rollover part.

Further, the left nick and the right nick are arc line segments with outward openings, and the connecting nick is a straight line segment.

The utility model discloses following beneficial effect has: (1) The connecting side wall of the battery shell is overlapped with the first side wall to form a welding seam, so that the wall thickness of a welding position can be increased, the condition of welding penetration is avoided, and the wall thickness of the plate can be reduced to about 0.3 mm; the battery shell product has less material consumption and low requirements on the production process; (2) Because the whole connecting side wall of the battery shell is overlapped with the first side wall, the contact area of the connecting side wall and the first side wall is large, and a reinforcing welding line can be formed through a penetration welding process to ensure that the connecting side wall and the first side wall are welded firmly, so that the poor phenomena of dislocation and the like are not easy to occur; (3) Because the wall thickness of the battery shell is only about 0.3mm, the explosion-proof nick can be directly carved on the battery shell, so that an explosion-proof structure does not need to be made on a top cover matched with the battery shell, the explosion-proof nick can get rid of the size limitation of the top cover, and the area of the explosion-proof nick can be larger; the whole anti-explosion nick is H-shaped, and the first rolling part and the second rolling part cannot be separated from the battery shell when being rolled outwards under strong air pressure, so that accidents caused by the fact that the rolling parts are separated from the battery shell can be avoided.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of a blade battery case formed by a drawing process in the prior art.

Fig. 2 is a schematic structural diagram of a blade battery case formed by a tailor welding process in the prior art.

Fig. 3 and 4 are perspective views of a preferred embodiment of a blade battery housing of the present invention.

Fig. 5 is a right side view of fig. 3.

Fig. 6 is a left side view of fig. 3.

In the figure: a first opening-111; a second opening-112; a first sidewall-121; a second sidewall-122; a third sidewall-123; a fourth sidewall-124; connecting the side walls-125; a first transverse weld-131; a second transverse weld-132; a third transverse weld-133; a fourth transverse weld-134; a first vertical weld-141; a second vertical weld-142; a third vertical weld-143; a fourth vertical weld-144; a fifth vertical weld-145; explosion-proof nick-150; a left nick-151; right score-152; connecting notch-153; a first rollover portion-161; a first tailor welded seam-191.

Detailed Description

The embodiments of the invention are explained below by means of specific examples, the illustrations provided in the following examples are merely illustrative of the basic idea of the invention, and features in the following examples and examples can be combined with one another without conflict.

In a preferred embodiment of a blade battery case according to the present invention, as shown in fig. 3 and 4, the battery case is a cylindrical case, the cylindrical case includes a plurality of side walls formed by bending a plate, and the plurality of side walls enclose a battery accommodating cavity for accommodating a battery material; the sheet material is preferably a metal sheet material (e.g., an aluminum sheet material, etc.). The cylindrical shell is provided with a first opening 111 and a second opening 112 which are oppositely arranged, and the first opening 111 and the second opening 112 are communicated with the battery accommodating cavity.

The plurality of sidewalls include a first sidewall 121 formed by bending one end of the plate material and a connecting sidewall 125 formed by bending the other end of the plate material. In this embodiment, the battery case is in the shape of a flat rectangular parallelepiped having a large length and width dimension and a small height dimension, and the plurality of side walls formed by bending the plate preferably include a first side wall 121, a second side wall 122 connected to the first side wall 121, a third side wall 123 connected to the second side wall 122, a fourth side wall 124 connected to the third side wall 123, and a connecting side wall 125 connected to the fourth side wall 124, wherein the first side wall 121 and the third side wall 123 are disposed opposite to each other, and the second side wall 122 and the fourth side wall 124 are disposed opposite to each other. The connecting side wall 125 is overlapped on the outer side of the first side wall 121, a welding seam is formed at the edge where the connecting side wall 125 is overlapped with the first side wall 121, and the connecting side wall 125 is fixed with the first side wall 121 along the welding seam. Preferably, the area of the first sidewall 121 is equal to the area of the connecting sidewall 125, and the connecting sidewall 125 completely overlaps the outer side of the first sidewall 121. Since the overlapping is formed at the position of the first sidewall 121 and the welding is performed, in order to facilitate the welding between the first sidewall 121 and the connecting sidewall 125, it is preferable that the area of the first sidewall 121 is smaller than or equal to the area of the other sidewalls. In the present embodiment, the first sidewall 121, the third sidewall 123 and the connecting sidewall 125 have the same area, and are smaller than the second sidewall 122 and the fourth sidewall 124.

The welding seam is in the shape of a "U" and includes a first transverse seam 131 formed between the non-connecting end of the connecting side wall 125 (i.e., the end of the sheet material) and the connecting ends of the first and

second side walls

121 and 122, and first and second

vertical seams

141 and 142 formed at both ends of the connecting side wall 125 and the corresponding ends of the first side wall 121. The first side wall 121 and the connecting side wall 125 can be connected by welding through the welding seam connection welding of the "U" shape, and the joint of the first side wall 121 and the connecting side wall 125 meets the sealing requirement of the battery case. Since the first transverse weld 131 is welded in the z direction in fig. 3, the welding direction is not the y direction perpendicular to the connecting side wall 125, and therefore, even if the wall thickness of the plate is thinned to 0.3mm, no weld-through occurs here. The first vertical weld seam 141 and the second vertical weld seam 142 are welded along the x direction and the direction opposite to the x direction in fig. 3, and the welding direction is not the y direction perpendicular to the connecting side wall 125, so that the situation of welding through can not occur, and the wall thickness of the plate can be reduced to save materials.

In order to better weld and fix the first sidewall 121 and the connecting sidewall 125, a reinforcing weld may be additionally provided at the overlapping portion of the connecting sidewall 125 and the first sidewall 121 according to actual conditions, wherein the reinforcing weld is formed after penetrating the connecting sidewall 125 through a penetration welding process in a y direction perpendicular to the connecting sidewall 125. Since the reinforcing welds are located at the overlapping portion of the connecting sidewall 125 and the first sidewall 121, and have a total thickness of 0.6mm, the penetration welding process only penetrates through the connecting sidewall 125, but not through the first sidewall 121. As shown in fig. 5, the reinforcement welds may include one or more of a second transverse weld 132, a third transverse weld 133, a fourth transverse weld 134, a third vertical weld 143, a fourth vertical weld 144, and a fifth vertical weld 145; the second transverse welding seam 132 is close to the non-connecting end (i.e. the end of the plate) of the connecting side wall 125, the fourth transverse welding seam 134 is located at the position where the connecting side wall 125 corresponds to the non-connecting end (i.e. the head end of the plate) of the first side wall 121, the third transverse welding seam 133 is located between the second transverse welding seam 132 and the fourth transverse welding seam 134, the third vertical welding seam 143 and the fifth vertical welding seam 145 are respectively located at the two sides of the connecting side wall 125, and the fourth vertical welding seam 144 is located between the third vertical welding seam 143 and the fifth vertical welding seam 145. The reinforcing weld is selected according to the situation after welding after forming the welding weld in a "U" shape, and the positions where the connection side wall 125 and the first side wall 121 are not firmly connected are firmly welded by the reinforcing weld.

In order to prevent the battery case from exploding when the internal pressure of the battery case is too high, an explosion-proof notch 150 may be further disposed on the third side wall 123, and the explosion-proof notch 150 is configured to be ruptured from the explosion-proof notch 150 to form a pressure relief opening when the internal pressure of the battery case is greater than a predetermined value. The explosion-proof score 150 can include left score 151, right score 152 and connection score 153, left score 151 and right score 152 symmetry set up, the one end of connecting score 153 is located the middle part of left score 151, and the other end is located the middle part of right score 152 to make explosion-proof score 150 wholly be "H" shape. The left and

right scores

151 and 152 may be arc-shaped line segments with the openings facing outwards, and the connecting score 153 may be a straight line segment. The upper half parts of the left score 151 and the right score 152 and the connecting score 153 surround to form a first turning part 161, and the lower half parts of the left score 151 and the right score 152 and the connecting score 153 surround to form a second turning part 162. Since the wall thickness of the battery case at the explosion-proof notch 150 is thin, when the internal pressure of the battery case is greater than a predetermined value, a strong air pressure may rupture the explosion-proof notch 150, so that the first rolled portion 161 is rolled up along the dotted line at the upper portion in fig. 6, and the second rolled portion 162 is rolled down along the dotted line at the lower portion in fig. 6, thereby forming a pressure relief opening, so that the internal pressure of the battery case is rapidly reduced to prevent explosion. Because the width of the third sidewall 123 is much greater than the width of the top cover matched with the battery case, the length of the connecting notch 153 can be very long, so that the explosion-proof notch 150 can get rid of the size limitation of the top cover, the area of the explosion-proof notch 150 can be larger, and the formed pressure relief opening can also be larger, so as to reduce the impact force of air pressure during pressure relief. In addition, since the entire explosion-proof score 150 has an "H" shape and the connection portions between the first and second rolled

portions

161 and 162 and the battery case (i.e., the broken lines in fig. 6) are wide, the first and second rolled

portions

161 and 162 do not come off the battery case when rolled outward under strong air pressure, and thus, it is possible to prevent an accident from occurring after the rolled portions come off the battery case.

The blade battery case of the embodiment has the following beneficial effects: (1) The connecting side wall 125 and the first side wall 121 are overlapped to form a U-shaped welding seam, so that the wall thickness of the welding position can be increased, the condition of welding through is avoided, and the requirement on the production process is low; and the wall thickness of the plate can be thinned to about 0.3mm, so that the material consumption of the battery shell product is reduced. (2) Because the whole connecting side wall 125 is overlapped with the first side wall 121, the contact area between the connecting side wall 125 and the first side wall 121 is large, and the connecting side wall 125 and the first side wall 121 can be firmly welded through an optional reinforcing welding seam, so that the bad phenomena of dislocation and the like are not easy to occur. (3) Because the wall thickness of the battery shell is only about 0.3mm, the explosion-proof nick 150 can be directly carved on the battery shell, so that an explosion-proof structure does not need to be made on a top cover matched with the battery shell, the explosion-proof nick 150 can get rid of the size limitation of the top cover, and the area of the explosion-proof nick 150 can be larger; the explosion-proof notch 150 is entirely H-shaped, and the first and

second turning portions

161 and 162 are not separated from the battery case when turned outward under strong air pressure, so that an accident caused by the fact that the turning portions are separated from the battery case can be avoided.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. A blade battery case, comprising: the battery storage box comprises a plurality of side walls formed by bending a plate, wherein the side walls enclose to form a battery accommodating cavity; the plurality of side walls comprise first side walls formed by bending from the head ends of the plates and connecting side walls formed by bending from the tail ends of the plates; the connecting side wall is overlapped on the outer side of the first side wall, a welding seam is formed at the overlapping position of the connecting side wall and the first side wall, and the connecting side wall is welded and fixed with the first side wall along the welding seam.

2. A blade battery housing as in claim 1, wherein: the area of the first side wall is equal to the area of the connecting side wall, and the connecting side wall is completely overlapped on the outer side of the first side wall.

3. A blade battery housing as in claim 2, wherein: the welding seam is U-shaped and comprises a first transverse welding seam formed between the tail end of the plate and the connecting end of the first side wall and the adjacent side wall of the plate, and a first vertical welding seam and a second vertical welding seam formed between the two ends of the connecting side wall and the corresponding end of the first side wall.

4. A blade battery housing as in claim 1, wherein: a reinforcing welding seam is further arranged at the overlapping position of the connecting side wall and the first side wall, and the reinforcing welding seams are formed after penetrating through the connecting side wall through a penetration welding process; the reinforcing weld joint comprises one or more of a second transverse weld joint, a third transverse weld joint, a fourth transverse weld joint, a third vertical weld joint, a fourth vertical weld joint and a fifth vertical weld joint; the second transverse welding seam is close to the tail end of the plate, the fourth transverse welding seam is positioned at the position of the connecting side wall corresponding to the head end of the plate, and the third transverse welding seam is positioned between the second transverse welding seam and the fourth transverse welding seam; the third vertical welding line and the fifth vertical welding line are respectively positioned at two sides of the connecting side wall, and the fourth vertical welding line is positioned between the third vertical welding line and the fifth vertical welding line.

5. A blade battery housing as in claim 1, wherein: the wall thickness of the plate is 0.3mm.

6. A blade battery housing as in claim 1, wherein: the plurality of side walls further comprise a second side wall, a third side wall and a fourth side wall which are formed by bending the plate, the first side wall and the third side wall are arranged oppositely, and the second side wall and the fourth side wall are arranged oppositely; the two ends of the second side wall are respectively connected with the first side wall and the third side wall, one end of the fourth side wall is connected with the third side wall, and the other end of the fourth side wall is connected with the connecting side wall.

7. The blade battery housing of claim 6, wherein: the area of the first side wall is smaller than or equal to the area of the other side walls.

8. A blade battery housing according to any one of claims 1 to 7, wherein: and the side wall opposite to the first side wall is provided with an explosion-proof nick.

9. A blade battery housing according to claim 8, wherein: the explosion-proof nicks comprise a left nick, a right nick and a connecting nick, the left nick and the right nick are symmetrically arranged, one end of the connecting nick is positioned in the middle of the left nick, and the other end of the connecting nick is positioned in the middle of the right nick; the first turnover part is formed by encircling the upper half part of the left nick and the right nick with the connecting nick, and the second turnover part is formed by encircling the lower half part of the left nick and the right nick with the connecting nick.

10. A blade battery housing according to claim 9, wherein: the left nick and the right nick are arc-shaped line segments with outward openings, and the connecting nick is a straight line segment.