Battery shell, single-end outlet terminal battery and double-end outlet terminal battery

Abstract

The utility model relates to the technical field of laser processing, and discloses a battery shell, a single-end outlet terminal battery and a double-end outlet terminal battery. The side shell is formed by bending a profile plate to form a cavity with two open ends; wherein the two ends, in butt joint with each other, of the profile plate are a first end and a second end, and the first end and / or the second end extend to form a folded edge which is bent in the direction opposite to the side face of the first end or the side face of the second end; the first end and the second end are arranged in a staggered mode so that the folded edge can be located between the first end and the second end, and a folded edge area is formed. The first end and the second end are welded and fixed in the edge folding area; the first end and the second end are arranged in a staggered manner to form the folded edge area for welding, so that the welding deformation is reduced, the tension protection on the side shell is realized, the edge rigidity and strength of the side shell are enhanced, a thinner 0.1-0.5 mm metal plate can be used, more space is manufactured in the side shell, the volume of a core body is increased, and the battery capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell, a single-end terminal battery and a double-end terminal battery. Background Art

[0002] Batteries are an indispensable energy source for new energy vehicles. As a new generation of power batteries, new energy vehicle batteries are one of the key technologies driving the development of new energy vehicles. Battery capacity directly determines the range of new energy vehicles. The larger the battery capacity, the longer the range. How to increase battery capacity while maintaining the same battery size is becoming an increasingly important development direction for the future of the new energy vehicle industry.

[0003] In order to meet the capacity requirements of new energy vehicle batteries, square shell batteries are widely used in existing battery technology. Their structure mainly includes four parts: shell, top cover, core and external insulation. However, square shell batteries often use deep drawing process to manufacture battery shells. Due to the limitations of drawing process and material strength, the battery shell is generally 0.5mm-1mm thick. Therefore, the battery shell wall thickness is relatively large, the available space of the battery core inside the battery is limited, and the battery capacity is relatively small.

[0004] Therefore, it is necessary to provide a new type of battery housing, a single-end terminal battery and a double-end terminal battery to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a battery housing, a single-end terminal battery and a double-end terminal battery, so as to solve the technical problem in the prior art that the battery capacity is small due to the limitation of the manufacturing process.

[0006] The utility model adopts the following technical solutions:

[0007] A battery housing, comprising: a side housing;

[0008] The side shell is formed by bending a profile plate to form a cavity with two open ends; wherein the two ends of the profile plate are connected to each other and are the first end and the second end, and the first end and / or the second end extends with a folded edge that is bent in the opposite direction to the side surface of the first end or the side surface of the second end;

[0009] The first end and the second end are staggered so that the folded edge is located between the first end and the second end to form a folded edge area;

[0010] The first end and the second end are fixed by welding in the hem region.

[0011] Furthermore, a first folded edge is extended from the first end; a second folded edge is extended from the second end;

[0012] The first folded edge is inserted between the second folded edge and the side surface of the second end.

[0013] Furthermore, the side wall corresponding to the second end is provided with a relief slope extending toward the outside of the side shell, and the relief slope continues to extend toward one side of the first end for a distance to form the second end;

[0014] When the first folded edge is inserted between the second folded edge and the side surface of the second end, the inner side of the side wall corresponding to the first end is flush with the inner side of the side wall corresponding to the second end.

[0015] Furthermore, the side shell has a thickness of 0.1-0.5 mm.

[0016] Furthermore, it also includes a bottom shell, which is welded to the first port of the side shell.

[0017] Furthermore, the bottom shell is provided with a first convex edge corresponding to the folded edge area, and the first convex edge covers the end of the folded edge area on the first port side and is welded to the folded edge of the folded edge area.

[0018] The utility model also provides a single-end terminal battery, comprising a top cover, a core body and a battery housing as claimed in claim 4 or 5;

[0019] The top cover is covered with the second port of the side shell to form a battery cavity, and the core is arranged in the battery cavity.

[0020] Furthermore, the top cover is provided with a second convex edge corresponding to the folded edge area, and the second convex edge covers the end of the folded edge area on the second port side and is welded to the folded edge of the folded edge area.

[0021] The utility model also provides a double-end terminal battery, comprising two top covers, a core body and a battery housing according to any one of claims 1 to 3;

[0022] The two top covers are respectively covered with the first port and the second port of the side shell to form a battery cavity, and the core is arranged in the battery cavity.

[0023] Furthermore, the two top covers are respectively provided with third convex edges corresponding to the folding areas, and the two third convex edges respectively cover the ends of the folding areas on the first port and the second port sides, and are welded to the folds of the folding areas.

[0024] Beneficial effects:

[0025] The utility model provides a battery shell, a single-end terminal battery and a double-end terminal battery. A profile plate with a thickness of 0.1-0.5 mm can be used to bend and form a side shell. The first end and the second end are staggered on the profile plate, and the first folded edge and the second folded edge are interlocked and overlapped to form a folded edge area. The thicker folded edge area is welded and fixed to reduce the deformation of the welding, thereby achieving tensile protection for the side shell and enhancing the edge rigidity and strength of the side shell. It is possible to use a 0.1-0.5 mm profile plate that is thinner than the 0.5-1 mm in the prior art, thereby creating more space in the side shell, increasing the volume of the core body, and improving the battery capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a single-end terminal battery of the present utility model;

[0027] Figure 2 This is a schematic diagram of the structure explosion of an embodiment of a single-end terminal battery of the present invention;

[0028] Figure 3 This is a schematic structural diagram of a top cover of a single-terminal battery in this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the bottom shell of a single-terminal battery in this utility model;

[0030] Figure 5 This is a schematic diagram of the top view of the curling area of ​​a battery housing according to the present invention;

[0031] Figure 6 This is a schematic structural diagram of a first folded edge of a battery housing according to the present invention;

[0032] Figure 7 This is a schematic structural diagram of a second folded edge of a battery housing according to the present invention;

[0033] Wherein: 1, side shell; 11, first end; 111, first folded edge; 12, second end; 121, second folded edge; 122, yielding slope;

[0034] 2. Bottom shell; 3. Top cover; 4. Core body; 5. Folding edge area; 6. First convex edge; 7. Second convex edge.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "several" means two or more, unless otherwise clearly and specifically defined.

[0038] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] Reference Figure 1 、 Figure 2 and Figure 5The utility model proposes a battery shell, characterized in that it includes: a side shell 1; the side shell 1 is formed by bending a profile plate to form a cavity with two ends open; wherein the two ends of the profile plate are connected to each other and are a first end 11 and a second end 12, and the first end 11 and / or the second end 12 are extended with a folded edge that is bent in the opposite direction to the side surface of the first end 11 or the side surface of the second end 12; the first end 11 and the second end 12 are staggered so that the folded edge is located between the first end 11 and the second end 12 to form a folded edge area 5; the first end 11 and the second end 12 are welded and fixed in the folded edge area 5; the thickness of the side shell is 0.1-0.5 mm.

[0041] In the above embodiment, the profile plate is bent by a bending method to form a cavity with two openings at both ends, which means that the profile plate will be bent into a shell with a cavity having two openings. The specific shape can be a cylinder, a prism, etc., which is not limited here. This cavity will be able to accommodate the battery core 4, and the two ends of the profile plate are respectively recorded as the first end 11 and the second end 12. A folded edge is extended from the first end 11 and / or the second end 12, which is bent in the opposite direction to the side of the first end 11 or the side of the second end 12. That is, only one of the first end 11 or the second end 12 can have a folded edge, or the first end 11 and the second end 12 can have a folded edge at the same time. For example, the folded edge of the first end 11 extends in the opposite direction to the side of the first end 11 to form a shape similar to a hook. At the same time, the hook-shaped folded edges formed at both ends are on different sides in the inner and outer directions, so that the first end 11 and the second end 12 can be staggered. The two hook-shaped folded edges can be buckled and overlapped with each other, and the entire area of ​​this buckled and overlapped shape forms the folded edge area 5.

[0042] After the first end 11 and the second end 12 are staggered, the folding area 5 is further welded and fixed. Compared with the existing direct welding of a layer of metal plate, the folding area 5 after the staggered arrangement is thicker, not easy to be welded through during the sealing welding process, and the welding deformation is small. The welding position can be any position in the folding area 5, but it should be noted that the welding position cannot be outside the folding area 5. If the welding position is outside the folding area 5, it is easy to be welded through or the weld is poorly formed due to the shell being too thin. Welding can also be done by single-strip welding or multiple-strip welding. Preferably, multiple-strip welding is used to make the sealing and fixing performance stronger. The welding method can be gas welding or laser welding. Laser welding is preferably used. Its high-precision, non-contact welding method can further ensure the edge stiffness and strength of the side shell 1. The first end 11 and the second end 12 are welded in the folding area 5, and the side shell 1 can greatly reduce material waste and improve production efficiency under the premise of ensuring structural stability, and can ensure the sealing of the side shell 1 and improve the mechanical strength of the side shell 1, so that thinner materials can be used in the selection of profile plates. Materials such as stainless steel, 1050 aluminum and 3003 aluminum with a thickness of 0.1-0.5 mm can be used to create more space for the side shell 1 to increase the volume of the core 4, thereby increasing the capacity of the battery and solving the problem of insufficient battery capacity in the existing technology.

[0043] In one embodiment, reference Figure 5-Figure 7 A first folded edge 111 extends from the first end 11; a second folded edge 121 extends from the second end 12; and the first folded edge 111 is inserted between the second folded edge 121 and the side surface of the second end 12.

[0044] In the above embodiment, the first fold edge 111 extending from the first end 11 is inserted into the second fold edge 121 extending from the second end 12, and the two hook-shaped fold edges are interlocked and overlapped with each other, which greatly improves the mechanical strength of the side shell 1, makes it more stable during actual use, and reduces the possibility of structural loosening and damage caused by vibration or external pressure. At the same time, the interlocked structure makes the deformation displacement before welding small, which will improve the accuracy during welding. The structure with a hook-shaped first fold edge 111 and a second fold edge 121 interlocked and overlapped with each other, so each fold edge has two layers of metal edges. After interlocking and overlapping, a folding area 5 with four layers of profile plates is formed, which improves the welding process of the folding area 5.

[0045] In one embodiment, reference Figure 5 and Figure 7The side wall corresponding to the second end 12 is provided with a relief slope 122 extending toward the outside of the side shell 1, and the relief slope 122 continues to extend a distance toward one side of the first end 11 to form the second end 12; when the first folded edge 111 is inserted between the second folded edge 121 and the side surface of the second end 12, the inner side of the side wall corresponding to the first end 11 is flush with the inner side of the side wall corresponding to the second end 12.

[0046] In the above embodiment, in order to ensure that when the first folded edge 111 is inserted between the second folded edge 121 and the side surface of the second end 12, the inner side of the side wall corresponding to the first end 11 and the inner side of the side wall corresponding to the second end 12 can be flush, a recessed slope 122 extending toward the outside of the side shell 1 is provided on the side wall corresponding to the second end 12. The recessed slope 122 can ensure that the inner side surfaces of the first end 11 and the second end 12 are in the same plane, so that the battery will not be uneven when the battery cells are installed, and can provide uniform support for the battery cells, making the internal structure more stable.

[0047] In one embodiment, a bottom shell 2 is further included, and the bottom shell 2 is welded to the first port of the side shell 1 .

[0048] In the above embodiment, since the side shell 1 is directly formed by bending the profile plate, it has openings at both ends. For a single-terminal battery, the side shell 1 and the bottom shell 2 need to be fixedly connected to form a barrel-shaped shell, and the fixed connection is achieved by welding. The welding method can be gas welding or laser welding. Laser welding is preferably used. Its high-precision, non-contact welding method can further ensure the fixing strength and sealing performance of the bottom shell 2 and the side shell 1. Moreover, the bottom shell 2 and the side shell 1 are formed and fixed in the form of welding, which can realize large-scale automated production, improve production efficiency and consistency, and reduce production costs.

[0049] In one embodiment, referring to Figure 4 The bottom shell 2 is provided with a first flange 6 corresponding to the folding area 5 , and the first flange 6 covers the end of the folding area 5 on the first port side and is welded to the fold of the folding area 5 .

[0050] In the above embodiment, in order to further ensure the sealing performance of the side shell 1, the bottom shell 2 is provided with a protruding first flange 6 corresponding to the folding area 5, and the first flange 6 covers the curling area in the height direction. After close covering, the first flange 6 is welded and fixed to the end of the folding area 5 on the first port side, ensuring that the inside of the side shell 1 is isolated from the outside world, preventing external dust or moisture from entering the inside of the side shell 1 from the folding area 5 with only a bending structure, and also preventing the internal electrolyte from leaking during actual use of the side shell 1, thereby improving the service life and performance of the battery. The welding method can be gas welding or laser welding, and laser welding is preferably used, which can achieve the effect of strengthening the sealing and fixation with a smaller weld.

[0051] The present invention also provides a single-end terminal battery, comprising a top cover 3, a core 4 and the battery shell as described above; the top cover 3 covers the second port of the side shell 1 to form a battery cavity, and the core 4 is arranged in the battery cavity.

[0052] In the above embodiment, the top cover 3 is a crucial component in the battery shell, single-end terminal battery and double-end terminal battery, and needs to have good strength. A part of it extends into the side shell 1, and the other part is covered on the side shell 1 in the form of a boss to achieve multi-directional sealing. The top cover 3 is also required to be made of high-strength, corrosion-resistant metal materials, such as stainless steel, aluminum alloy, etc., to meet the use requirements of the battery in various environments. The top cover 3 and the side shell 1 with the bottom shell 2 form a battery cavity. The core 4 is the core component in the battery and is crucial to the overall performance and safety of the battery. The positive electrode of the core 4 can be made of oxide materials, such as lithium cobalt oxide, lithium nickel oxide, etc., and the negative electrode can be made of graphite or silicon materials. These materials have high specific capacity and long cycle life and can ensure excellent safety and stability. The core 4 is placed in the side shell 1, and the electrolyte is injected to seal the top cover 3 to ensure that the internal environment of the battery cell is stable, thereby forming a complete battery.

[0053] In one embodiment, referring to Figure 2 and Figure 3 The top cover 3 is provided with a second flange 7 corresponding to the folding area 5 , and the second flange 7 covers the end of the folding area 5 on the second port side and is welded to the fold of the folding area 5 .

[0054] In the above embodiment, similar to the first flange 6, a protruding second flange 7 is provided on the top cover 3 corresponding to the folding area 5, and the second flange 7 covers the curling area in the height direction. After close covering, the second flange 7 is welded and fixed to the end of the folding area 5 on the second port side, ensuring that the inside of the side shell 1 is isolated from the outside world, preventing external dust or moisture from entering the inside of the side shell 1 from the folding area 5, and also preventing the internal electrolyte from leaking when the side shell 1 is actually used. The top cover 3 with the second flange 7 can be formed by stamping or CNC full milling during production. However, considering that the precision of stamping is relatively low, CNC full milling is preferred, and the generation process is not easy to cause deformation to the workpiece. Furthermore, the top cover 3 may also be provided with an explosion-proof valve, wherein the explosion-proof valve is welded and fixed to the top cover 3 and is connected to the battery cavity. The explosion-proof valve serves as a pressure relief valve. The specific design and parameter selection are based on the characteristics and requirements of the actual application battery. An appropriate hole or channel is pre-set on the top cover 3 for installing and welding the explosion-proof valve. It is further necessary to ensure that the explosion-proof valve is tightly connected to the top cover 3 to prevent leakage. The explosion-proof valve is connected to the battery cavity in the internal space of the side shell 1, so that when excessive pressure is generated inside the battery, the pressure impacts the explosion-proof valve. When the pressure reaches a certain value, the explosion-proof valve can be opened in time to release the pressure to prevent the battery from exploding.

[0055] An embodiment of the present invention also provides a double-end terminal battery, comprising two top covers 3, a core 4 and the battery shell as described above; the two top covers 3 are respectively covered with the first port and the second port of the side shell 1 to form the battery cavity, and the core 4 is arranged in the battery cavity.

[0056] In the above embodiment, the two top covers 3 together cover the first port and the second port of the side shell 1 to form a battery cavity, and the core 4 is arranged in this battery cavity. The two top covers 3 can be made of conductive materials. The top cover 3 at one end serves as the positive electrode, and the other end serves as the negative electrode to connect with other battery components and transfer charge. The top cover 3 can help ensure the sealing and stability of the battery cavity and prevent electrolyte leakage.

[0057] In one embodiment, the two top covers 3 are respectively provided with third flanges corresponding to the folding areas 5 , and the two third flanges respectively cover the ends of the folding areas 5 on the first port and the second port sides, and are welded to the folds of the folding areas 5 .

[0058] In the above embodiment, similar to the first flange 6 and the second flange 7, the two top covers 3 are provided with a protruding third flange corresponding to the folding area 5, and the third flange covers the curling area in the height direction. After close covering, the two third flanges are respectively welded and fixed to the two sides of the end of the folding area 5 on the first port and the second port side, ensuring that the inside of the side shell 1 is isolated from the outside world and preventing external dust or moisture from entering the inside of the side shell 1 from the folding area 5. The two top covers 3 with the third flange can also be formed by stamping or CNC full milling during production. However, considering the low precision of stamping, CNC full milling is preferred. The production process is not easy to cause deformation of the workpiece, thereby greatly improving the quality of the battery. Similar to a single-end terminal battery, an explosion-proof valve can be set on one of the top covers 3, wherein the explosion-proof valve is welded and fixed to the top cover 3 and the explosion-proof valve is connected to the battery cavity. Similarly, the explosion-proof valve plays a role of pressure relief, because one explosion-proof valve can play the required role. Therefore, there is no need for redundancy of explosion-proof valves in terms of cost or design concept. An appropriate hole or channel is pre-set on one of the top covers 3 for installing the explosion-proof valve. It is further necessary to ensure that the explosion-proof valve is tightly connected to the top cover 3, and the explosion-proof valve is connected to the battery cavity, so that when excessive pressure is generated inside the battery, the pressure impacts the explosion-proof valve. When the pressure reaches a certain value, the explosion-proof valve can open in time to release the pressure, effectively preventing the battery from exploding.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery housing, characterized in that: include: Side shell; The side shell is formed by bending a profile plate to form a cavity with two ends open; wherein the two ends of the profile plate are a first end and a second end, and the first end and / or the second end extend with a folded edge that is bent in the opposite direction to the side surface of the first end or the side surface of the second end; The first end and the second end are arranged alternately so that the folded edge is located between the first end and the second end to form a folded edge area; The first end and the second end are fixed by welding in the folding area.

2. The battery housing according to claim 1, characterized in that: A first folded edge is extended from the first end; a second folded edge is extended from the second end; The first folded edge is inserted between the second folded edge and a side surface of the second end.

3. The battery housing according to claim 2, characterized in that: The side wall corresponding to the second end is provided with a relief slope extending toward the outside of the side shell, and the relief slope continues to extend a distance toward one side of the first end to form the second end; When the first folded edge is inserted between the second folded edge and the side surface of the second end, the inner side of the side wall corresponding to the first end is flush with the inner side of the side wall corresponding to the second end.

4. The battery housing according to claim 1, characterized in that: The side shell has a thickness of 0.1-0.5 mm.

5. The battery housing according to any one of claims 1 to 4, characterized in that: It also includes a bottom shell, which is welded to the first port of the side shell.

6. The battery casing according to claim 5, characterized in that: The bottom shell is provided with a first convex edge corresponding to the folded edge area, and the first convex edge covers the end of the folded edge area on the first port side and is welded to the folded edge of the folded edge area.

7. A single-end terminal battery, characterized in that: A battery housing comprising a top cover, a core body and the battery housing as claimed in claim 5 or 6; The top cover is covered with the second port of the side shell to form a battery cavity, and the core is arranged in the battery cavity.

8. The single-end terminal battery according to claim 7, characterized in that: The top cover is provided with a second convex edge corresponding to the folded edge area, and the second convex edge covers the end of the folded edge area on the second port side and is welded to the folded edge of the folded edge area.

9. A double-ended terminal battery, characterized in that: Comprising two top covers, a core body and a battery casing as claimed in any one of claims 1 to 4; The two top covers are respectively covered with the first port and the second port of the side shell to form a battery cavity, and the core is arranged in the battery cavity.

10. The double-ended terminal battery according to claim 9, characterized in that: The two top covers are respectively provided with third flanges corresponding to the folding edge areas, and the two third flanges respectively cover the ends of the folding edge areas on the first port and the second port sides, and are welded to the folding edges of the folding edge areas.

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