CN111341949A - Battery shell, battery, manufacturing method of battery and battery module - Google Patents

Abstract

The invention discloses a battery shell, a battery, a manufacturing method of the battery and a battery module, wherein the battery shell comprises a shell body and auxiliary welding plates, the shell body is formed by bending a metal plate and then welding, two ends of the shell body are opened, the shell body comprises a first panel, a second panel and two third panels, the two third panels are oppositely arranged, the first panel and the second panel are oppositely arranged, a protruding structure is arranged on the first panel, the protruding structure faces to one side far away from the second panel and is provided with a groove in the shell body, the auxiliary welding plates are arranged in the groove, and a to-be-welded gap formed by bending the metal plate is positioned on the protruding structure. The shell body is formed by bending a metal plate and then welding, the auxiliary welding plate is arranged in the groove formed by the protruding structure on the first panel, and the core cladding is prevented from being burnt during welding operation.

Description

A battery case, battery, battery manufacturing method and battery module

technical field

The present invention relates to the technical field of battery manufacturing, in particular to a battery case, a battery, a battery manufacturing method and a battery module.

Background technique

Existing battery shells are usually stamped or stretched aluminum shells, or aluminum-plastic film hot-melt molding is used. These two methods have low material utilization rate, the shape is restricted by the molding process, and the production efficiency is low. The strength of the soft pack battery using the aluminum-plastic film hot-melt molding method is low, the utilization rate of the aluminum-plastic film is low, and the cost is high. However, the shape of the battery using the aluminum shell stamping or stretching method is restricted, and the cost of the aluminum shell is high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a battery case, a battery, a manufacturing method of a battery and a battery module, which are low in cost and high in production efficiency.

For this purpose, the present invention adopts the following technical solutions:

In one aspect, a battery case is provided, including a case body and an auxiliary welding plate, the case body is formed by bending a metal plate and then welded, the two ends of the case body are open, and the case body includes a first A panel, a second panel and two third panels, the two third panels are arranged opposite to each other, the first panel and the second panel are arranged opposite to each other, the first panel is composed of two parts of the metal plate After the end is welded and formed, the first panel is provided with a protruding structure, the protruding structure is disposed toward the side away from the second panel and forms a groove inside the shell body, and the auxiliary welding plate It is arranged in the groove and is attached to the protruding structure, and the to-be-welded gap formed after the metal plate is bent is located on the protruding structure.

As a preferred solution of the present invention, the second panel and the two third panels are both rectangular, and the length of the third panel is at least three times its width, and the width of the third panel is at least twice the width of the second panel.

As a preferred solution of the present invention, the metal plate is steel, aluminum alloy or aluminum material.

As a preferred solution of the present invention, the thickness of the metal plate is 0.1-1 mm.

In another aspect, a battery is provided, comprising a core pack, two cover plates and the battery case according to any one of the above technical solutions, wherein the core pack is arranged inside the casing body, and the two cover plates are respectively Both ends of the casing body are covered.

As a preferred solution of the present invention, one side of the core package is attached to the auxiliary welding plate.

In addition, a method for manufacturing a battery is also provided, comprising the steps of:

S1. Provide a metal plate and an auxiliary welding plate, bend both ends of the metal plate to form a bending part, bend the metal plate and make the two bending parts abut, and the inner sides of the two bending parts forming a groove for accommodating the auxiliary welding plate;

S2. Provide two cover plates and a core pack, and connect the two cover plates to both ends of the core pack;

S3. The core package is placed in the metal plate, and the auxiliary welding plate is placed on the core package;

S4. Align the two bending parts to form a raised structure and a gap to be welded, and weld the gap to be welded to form a battery case;

S5. Weld the two cover plates to the battery case.

8 . The method for manufacturing a battery according to claim 7 , wherein after step S4 and before step S5 , the edge of the battery case is bent to cover the edge of the cover plate. 9 .

Finally, a battery module is also provided, which includes several batteries described in the above technical solutions.

As a preferred solution of the present invention, the third panels of two adjacent battery housings are close to each other.

Beneficial effects of the present invention:

The shell body of the battery shell of the present invention is formed by welding after bending a metal plate, and an auxiliary welding plate is arranged in the groove formed by the protruding structure on the first panel to avoid burning the core pack during the welding operation. The manufacturing process of the casing is simple, the utilization rate of raw materials is high, and the production efficiency is high and the production cost is low. Since the metal sheet is in an unfolded state before the shell body is completed, the process of inserting the core pack into the shell is also very convenient, and the surface of the core pack will not rub against the battery case, which effectively avoids the occurrence of the core pack during the process of entering the shell. damage.

Description of drawings

FIG. 1 is a schematic diagram of a metal sheet before bending according to an embodiment of the present invention;

FIG. 2 is a three-dimensional schematic diagram of the metal sheet in FIG. 1 after bending;

Fig. 3 is the enlarged view of A place in Fig. 2;

4 is a schematic perspective view of a battery case after wrapping a core pack according to an embodiment of the present invention;

FIG. 5 is an enlarged view of B in FIG. 4 .

In the picture:

1. Housing body; 11. The first panel; 111. The raised structure; 1111, The first bending part; 1112, The second bending part; 12, The second panel; 13, The third panel; plate; 3. core package; 100, metal plate; 110, first reference line; 120, second reference line; 200, gap to be welded.

Detailed ways

The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, a first feature being "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below" the second feature includes that the first feature is directly below and diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature.

As shown in FIG. 1 to FIG. 5 , the battery case of this embodiment includes a case body 1 and an auxiliary welding plate 2 . The case body 1 is formed by bending a metal plate 100 and then welded. Both ends of the case body 1 are open. The body 1 includes a first panel 11, a second panel 12 and two third panels 13. The two third panels 13 are arranged opposite to each other. The first panel 11 and the second panel 12 are arranged opposite to each other. The first panel 11 is made of metal. The two ends of the plate 100 are welded and formed. The first panel 11 is provided with a protruding structure 111. The protruding structure 111 is disposed toward the side away from the second panel 12 and forms a groove inside the shell body 1. The auxiliary welding plate 2 The slot to be welded 200 formed after the metal plate 100 is bent is located on the raised structure 111 and is arranged in the groove and is attached to the raised structure 111 .

The casing body 1 of the battery casing in this embodiment is formed by bending a metal plate 100 and then welding. By arranging an auxiliary welding plate 2 in the groove formed by the protruding structure 111 on the first panel 11 to avoid the welding operation Burning the core pack 3, the manufacturing process of the battery casing is simple, the utilization rate of raw materials is high, and the production efficiency and production cost are relatively low. Since the metal plate 100 is in an unfolded state before the casing body 1 is completed, the process of inserting the core pack 3 into the casing is also very convenient. Damage occurred during shelling.

Preferably, both the second panel 12 and the two third panels 13 are rectangular, the length of the third panel 13 is at least three times its width, and the width of the third panel 13 is at least twice the width of the second panel 12 . The case body 1 manufactured in this way is suitable for use in large-length batteries used for battery modules. Compared with the case manufacturing method of metal extrusion molding or drawing molding, the energy consumption is greatly reduced, and the energy consumption is greatly reduced. big cost advantage.

Preferably, the metal plate 100 is made of steel, aluminum alloy or aluminum, and the use of steel has obvious cost advantages.

Preferably, the thickness of the metal plate 100 is 0.1-1 mm. Depending on the type of battery, metal foil or thin metal plate can be selected as the raw material of the case body 1 . When steel foil or other types of metal foils are selected, it can be used to manufacture pouch cells. Compared with conventional pouch cells packaged with aluminum-plastic film, this kind of pouch cell has higher raw material utilization and cost advantages. When using thin metal plates, it can be used to make square batteries.

An embodiment of the present invention also provides a battery, including a core pack 3, two cover plates (not shown in the figure) and a battery case according to any of the above embodiments. The core pack 3 is arranged inside the casing body 1, and the two The two cover plates cover the openings at both ends of the casing body 1 respectively.

Further, one side of the core package 3 is attached to the auxiliary welding plate 2 . The welding of the metal plate 100 is the key in the manufacturing process of the shell body 1 , and the auxiliary welding plate 2 can cover the gap 200 to be welded to prevent the core package 3 from being burned during the welding operation. When the thickness of the metal plate 100 is thin, it is difficult to obtain a straight and stable gap 200 to be welded. The auxiliary welding plate 2 can provide a flat supporting surface at this time, which is convenient for the two ends of the metal plate 100 to be aligned, so as to form a consistent The required gap to be welded 200. At this time, one side of the core package 3 is attached to the auxiliary welding plate 2, which can provide a certain supporting force and keep the auxiliary welding plate 2 in a relatively stable state.

The present invention also provides a method for manufacturing a battery, comprising the following steps:

S1. Provide the metal plate 100 and the auxiliary welding plate 2, bend both ends of the metal plate 100 to form the first bending part 1111 and the second bending part 1112, bend the metal plate 100 and make the first bending part 1111 and the second bending part 1112. The second bending portion 1112 abuts against, and the inner sides of the first bending portion 1111 and the second bending portion 1112 form a groove for accommodating the auxiliary welding plate 2;

S2. Provide two cover plates and a core pack 3, and connect the two cover plates to both ends of the core pack 3;

S3. The core pack 3 is placed in the metal plate 100, and the auxiliary welding plate 2 is placed on the core pack 3;

S4. Align the first bending portion 1111 and the second bending portion 1112 to form the to-be-welded gap 200, and weld the to-be-welded gap 200 to form the battery case;

S5. Weld the two cover plates with the battery case.

As shown in FIG. 1 , preferably, the metal plate 100 is provided with four first reference lines 110 and four second reference lines 120 , and the metal plate 100 is first bent along the four first reference lines 110 to form a first fold. The bent portion 1111 and the second bent portion 1112 form the raised structure 111 after welding the first bent portion 1111 and the second bent portion 1112 along the gap 200 to be welded. Considering that the distance between the two adjacent first reference lines 110 is relatively small, Recently, the force required for bending is relatively large, and the first bending part 1111 and the second bending part 1112 can be made by pressing and forming. After placing the core pack 3 in place, the auxiliary welding plate 2 can be placed on the core pack 3. The reason why the auxiliary welding plate 2 is placed at this time instead of waiting for the first bending part 1111 and the second bending part 1112 to be closed The purpose of inserting the auxiliary welding plate 2 is to prevent the auxiliary welding plate 2 from rubbing against the surface of the core pack 3 when the auxiliary welding plate 2 is inserted. Insulation, once such friction occurs, the insulating film is likely to be damaged and ruptured.

In other embodiments, when the thickness of the metal plate 100 is relatively thick, the housing body 1 has sufficient strength, and the first bending part 1111 and the second bending part 1112 can maintain their own shapes. At this time, the auxiliary The welding plate 2 does not need the core package 3 to provide support. Before the welding operation, the two ends of the auxiliary welding plate 2 can be clamped and fixed on the first bending part 1111 and the second bending part 1112 by a clamp, and then Weld the gap 200 to be welded.

Further, in some embodiments, after step S4 and before step S5, the edge of the battery case is bent to cover the edge of the cover plate. When the thickness of the metal plate 100 is thin, this method can be used. Since the welding part is covered, when laser welding is used, the laser will not burn the core pack 3 through the gap between the battery case and the cover plate. At the same time, the area of the welding area is also increased, and the difficulty of welding is reduced.

An embodiment of the present invention also provides a battery module, including a plurality of batteries according to any of the above-mentioned embodiments. At present, the battery modules used as power tend to select batteries with larger lengths for grouping. The batteries of the embodiments of the present invention can well meet this requirement, and at the same time, the manufacturing difficulty and cost of the battery modules can be greatly reduced.

Specifically, the third panels 13 of two adjacent battery housings are close to each other. Since the first panel 11 is provided with the protruding structure 111, the first panel 11 is not a flat plane, so in the battery module, the first panel 11 can only be arranged to face upward, so that the third panel 13 can be used as a group when several batteries are close to each other.

In some embodiments, a thermally conductive buffer layer is further disposed between the third panels 13 of two adjacent battery casings, to prevent the batteries from overheating and deformation of the battery casings caused by the mutual extrusion of the batteries.

As a preferred embodiment of the present invention, in the description of this specification, reference to the description of the terms "preferred", "further" etc. means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in this specification at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above examples are only used to illustrate the detailed solutions of the present invention, and the present invention is not limited to the above detailed solutions, that is, it does not mean that the present invention must rely on the above detailed solutions to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent replacement of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims (10)

1. The utility model provides a battery shell, its characterized in that includes casing body and supplementary welding plate, the casing body is by welding forming after sheet metal buckles, casing body both ends opening, the casing body includes a first panel, a second panel and two third panels, two the third panel sets up relatively, first panel with the second panel sets up relatively, first panel by sheet metal's both ends shaping after welding, be provided with protruding structure on the first panel, protruding structure orientation is kept away from one side of second panel sets up and is in the inside recess that forms of casing body, supplementary welding plate sets up in the recess and with protruding structure laminating, what sheet metal formed after buckling waits to weld the gap and is located protruding structure is last.

2. The battery housing of claim 1, wherein the second panel and both of the third panels are rectangular and the third panels are at least three times as long as they are wide, the third panels being at least two times as wide as the second panel.

3. The battery case according to claim 1, wherein the metal plate material is a steel material, an aluminum alloy or an aluminum material.

4. The battery case according to claim 1, wherein the metal plate has a thickness of 0.1 to 1 mm.

5. A battery, comprising a core package, two cover plates and the battery shell as claimed in claim 1 or 2, wherein the core package is disposed inside the shell body, and the two cover plates respectively cover the openings at the two ends of the shell body.

6. The battery of claim 5, wherein one side of the core pack is attached to the auxiliary weld plate.

7. A method of manufacturing a battery, comprising the steps of:

s1, providing a metal plate and an auxiliary welding plate, bending two ends of the metal plate to form bending parts, bending the metal plate and enabling the two bending parts to be abutted, and forming a groove for accommodating the auxiliary welding plate on the inner sides of the two bending parts;

s2, providing two cover plates and a core package, and connecting the two cover plates to two ends of the core package;

s3, placing the core package in a metal plate, and placing the auxiliary welding plate on the core package;

s4, aligning the two bending parts to form a protruding structure and a gap to be welded, and welding the gap to be welded to form a battery shell;

and S5, welding the two cover plates with the battery shell.

8. The method of manufacturing a battery according to claim 7, wherein after step S4 and before step S5, an edge of the battery case is bent to cover an edge of the cap plate.

9. A battery module comprising a plurality of the batteries of claim 5.

10. The battery module according to claim 9, wherein the third panels of two adjacent battery cases are adjacent to each other.

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