A cylindrical battery case structure

Abstract

The utility model discloses a shell structure of cylindrical battery, including U type shell, the end of U type shell is equipped with boss, the end of U type shell is equipped with several thinning area and an anti -explosion area. This shell adopts one side closed, one side opening single -pass U type shell form, and the use mode of single cover plate is combined in the battery assembly process, and the structure spare and the sealing welding manufacturing cost are saved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a casing structure for a cylindrical battery. Background Technology

[0002] Most existing shell structures are double-opening and welded with cover plates, requiring two cover plates and two sealing welds at both ends, which is costly.

[0003] The existing single-channel U-shaped cylindrical shell does not have an explosion-proof pressure relief port at the bottom. In the event of battery thermal runaway, explosion-proof pressure relief is only carried out through the cover side, which is slow and has poor safety. The existing single-channel U-shaped cylindrical shells mostly have flat bottoms, and there are no raised positioning welding areas when assembling batteries and connecting PACKs, resulting in poor assembly convenience. The existing single-channel U-shaped cylindrical shell does not have a stamping thinning area at the bottom, resulting in a low pass rate for bottom penetration welding of the battery. Utility Model Content

[0004] In view of this, the present invention aims to provide a casing structure for a cylindrical battery to solve at least one technical problem in the prior art.

[0005] The purpose of this utility model is to propose a cylindrical battery casing structure. By setting a thinning welding area, a stamped protrusion positioning area and an explosion-proof pressure relief port on the bottom of the casing, the cylindrical casing not only improves the safety performance of the product, increases the pass rate of one-end polarity welding, and improves the convenience of battery assembly, but also reduces the battery manufacturing cost.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A cylindrical battery casing structure includes a U-shaped casing with a boss at one end; The ends of the U-shaped shell are provided with several thinning zones and an explosion-proof zone.

[0007] U-shaped shells can be made of various metal materials, including aluminum, steel, and stainless steel.

[0008] Furthermore, the shape of the boss can be either circular or polygonal.

[0009] Furthermore, the thinning zone is evenly distributed at the end of the U-shaped shell.

[0010] Furthermore, the thinning area includes a first groove and a second groove, which are respectively disposed on the inner and outer sides of the end of the U-shaped shell; The thinning area may include a third groove and a protrusion, with the third groove located on the outer side of the U-shaped shell end and the protrusion located on the inner side of the U-shaped shell end.

[0011] Furthermore, the shape of the thinning zone can be one of the following: rectangle, square, circle, fan, or ring.

[0012] Furthermore, there are four thinning zones, which are evenly spaced.

[0013] Furthermore, the thickness of the thinned region is 1 / 2 to 2 / 3 of the thickness of the shell bottom.

[0014] Furthermore, the explosion-proof zone features internal and external stamped explosion-proof markings; Internal and external stamping explosion-proof markings include one of the following: circular explosion-proof markings, waist-shaped explosion-proof markings, line-segment explosion-proof markings, or welded explosion-proof discs.

[0015] A cylindrical battery using the above-mentioned casing structure, wherein a cover plate is provided on one side of the U-shaped casing, the cover plate is provided with an explosion-proof valve and a liquid injection hole, and the cover plate is also provided with a through hole that allows the terminal post to pass through.

[0016] Compared with the prior art, the cylindrical battery casing structure of this utility model has the following advantages: 1. This housing adopts a U-shaped housing form with one side closed and one side open. Combined with the use of a single cover plate during battery assembly, it saves on the manufacturing costs of structural components and sealing welding.

[0017] 2. This U-shaped single-pass housing has explosion-proof grooves formed by one-time stamping, which not only reduces costs but also improves the explosion-proof pressure relief safety performance.

[0018] 3. This U-shaped single-pass housing has a centrally stamped welding platform, which facilitates positioning and welding during battery pack assembly and PACK electrical connection, improving assembly efficiency and assembly convenience.

[0019] 4. Thinning areas are set at the bottom of the casing, which greatly improves the pass rate of penetration welding when assembling with the battery. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of a U-shaped casing for a cylindrical battery according to Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the end face of the U-shaped casing of a cylindrical battery according to Embodiment 1 of this utility model; Figure 3 for Figure 2 A schematic diagram of AA; Figure 4 for Figure 2A diagram of a BB; Figure 5 This is a schematic diagram of a U-shaped casing for a cylindrical battery according to Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the thinning region of the U-shaped casing of a cylindrical battery according to Embodiment 2 of this utility model; Figure 7 This is a schematic diagram of the assembly of a U-shaped casing for a cylindrical battery according to Embodiment 1 of this utility model; Figure 8 This is a schematic diagram of the other side of the battery assembly of the U-shaped casing of a cylindrical battery according to Embodiment 1 of this utility model.

[0021] 1. U-shaped shell; 2. Boss; 3. Thinning area; 301. First groove; 302. Second groove; 303. Third groove; 304. Protrusion; 4. Explosion-proof area; 5. Explosion-proof valve; 6. Injection hole; 7. Through hole. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1 like Figure 1 - Figure 4 As shown, a cylindrical battery casing structure includes a U-shaped casing 1, with a boss 2 at one end of the U-shaped casing 1; The end of the U-shaped shell 1 is provided with several thinning zones 3 and an explosion-proof zone 4; the boss 2 is circular in shape.

[0027] Thinning zones 3 are evenly distributed at the ends of the U-shaped shell 1. Thinning zones 3 include a first groove 301 and a second groove 302, which are respectively disposed on the inner and outer sides of the ends of the U-shaped shell 1.

[0028] The thinning zone 3 is rectangular in shape, and there are four thinning zones 3, which are evenly spaced. The thickness of the thinning zone 3 is 1 / 2 to 2 / 3 of the thickness of the shell bottom. The explosion-proof zone 4 is a circular explosion-proof groove stamped inside and out.

[0029] Example 2 like Figures 5-6 As shown, a cylindrical battery casing structure includes a U-shaped casing 1, a cover plate on one side of the U-shaped casing 1, and a boss 2 on the other side of the U-shaped casing 1; several thinning zones 3 and an explosion-proof zone 4 are provided on the outer side of the end of the U-shaped casing 1. The boss 2 is square in shape.

[0030] Thinning zones 3 are evenly distributed at the ends of the U-shaped shell 1. Thinning zones 3 include a third groove 303 and a protrusion 304. The third groove 303 is located on the outer side of the end of the U-shaped shell 1, and the protrusion 304 is located on the inner side of the end of the U-shaped shell 1.

[0031] The thinning zone 3 is fan-shaped, and there are four thinning zones 3, which are evenly spaced. The thickness of the thinning zone 3 is 1 / 2 to 2 / 3 of the thickness of the shell bottom. The explosion-proof zone 4 is a circular explosion-proof groove stamped inside and out.

[0032] like Figure 7 and Figure 8 The diagram shows an overall schematic of the assembled casing structure of a cylindrical battery.

[0033] Example 3 A cylindrical battery using the casing structure described in Example 1, wherein the casing structure of the cylindrical battery is a U-shaped form with a cover plate on one side and an opening on the other side. Figure 7 and Figure 8 As shown.

[0034] The bottom of the casing is centered and stamped as a cylindrical protrusion in 304 stainless steel. This design facilitates positioning and cross-side electrical connections during subsequent battery assembly and PACK, improving the convenience of cross-side high-rate electrical connections. Four rectangular areas are evenly distributed at the bottom 90°. These areas are formed by stamping, and the inner and outer parts of the shell bottom are pressed thin to form three thinning regions. The residual thickness of the three thinning regions is about 1 / 3 to 1 / 2 of the shell bottom thickness. These three thinning regions facilitate the penetration welding of the polarity at one end of the battery, improving the welding qualification rate.

[0035] The bottom of the casing also features stamped explosion-proof grooves with an initiation pressure of 0.5-1.8 MPa, used for battery safety venting. This type of explosion-proof stamped groove not only reduces costs but also provides explosion-proof pressure relief, improving safety performance. The shell structure of this application can also have the following forms: the stamped boss 2 can be of various shapes: square, rectangle, polygon, etc.; the thinning welding area can also be of various forms: circular, fan-shaped, ring, etc.; the thinning area 3 can be thinned both inside and outside at the same time, or it can be thinned in the form of external concavity and internal protrusion 304.

[0036] The bottom of the single-pass housing has an integrated 304 protrusion 2, a thinning welding area, and an explosion-proof valve 5. The single-pass housing can be made of various metal materials such as aluminum, steel, and stainless steel. The group of 304 protrusions 2 can be circular, square, rectangular, polygonal, etc. The welding thinning area 3 can be rectangular, square, circular, fan-shaped, annular, etc. The thinning area 3 can be thinned both inside and outside, or it can be thinned in the form of external concavity and internal 304 protrusion. The explosion-proof valve 5 can be in various forms such as circular explosion-proof grooves, waist-shaped explosion-proof grooves, line segment explosion-proof grooves, or welded explosion-proof plates.

[0037] Example 4 This invention discloses a casing structure for cylindrical batteries, wherein the casing is a U-shaped structure with one side closed and the other side open. The bottom of the casing is a centrally stamped cylindrical protrusion made of 304 stainless steel, which facilitates positioning and electrical connection during subsequent battery assembly and PACKing. Four rectangular areas are evenly distributed on the bottom, and these areas are thinned into three regions by stamping the inner and outer sides of the casing bottom. The thickness of these three regions is approximately 1 / 3 to 1 / 2 of the casing bottom thickness, facilitating the through-welding of the battery polarity at one end. Simultaneously, the bottom of the casing is provided with stamped explosion-proof grooves, with an explosion pressure of 0.5-1.8 MPa, for safe battery explosion relief. This casing structure not only saves costs and improves rate performance but also enhances safety performance.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cylindrical battery case structure, characterized by: Includes a U-shaped housing, with a boss at one end of the U-shaped housing; The ends of the U-shaped shell are provided with several thinning zones and an explosion-proof zone.

2. The cylindrical battery case structure according to claim 1, wherein: The boss can be either circular or polygonal in shape.

3. The cylindrical battery case structure according to claim 1, wherein: The thinning zone is evenly distributed at the ends of the U-shaped shell.

4. The cylindrical battery case structure according to claim 1, wherein: The thinning area includes a first groove and a second groove, which are respectively located on the inner and outer sides of the end of the U-shaped shell; The thinning area may include a third groove and a protrusion, with the third groove located on the outer side of the U-shaped shell end and the protrusion located on the inner side of the U-shaped shell end.

5. The cylindrical battery case structure according to claim 1, wherein: The thinning zone can be one of the following shapes: rectangle, square, circle, fan, or ring.

6. The cylindrical battery case structure according to claim 1, wherein: There are 4 thinning zones.

7. The casing structure of a cylindrical battery according to claim 1, characterized in that: The thickness of the thinned zone is 1 / 2 to 2 / 3 of the thickness of the shell bottom.

8. The casing structure of a cylindrical battery according to claim 1, characterized in that: The explosion-proof zone features internal and external stamped explosion-proof markings; Internal and external stamping explosion-proof markings include one of the following: circular explosion-proof markings, waist-shaped explosion-proof markings, line-segment explosion-proof markings, or welded explosion-proof plates.

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