Protection structure of cylindrical battery, battery monomer, energy storage device and electric equipment
By designing the trapezoidal table and the first groove in the protective structure of the cylindrical lithium battery, the problem of the beads and/or slag falling into the battery cell during the surface welding process is solved, and the yield of the battery cell is improved.
Patent Information
- Application Number
- CN202421499112.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-27
AI Technical Summary
During the surface welding process of existing cylindrical lithium batteries, molten beads and/or slag fall into the battery cell, resulting in the problem of low cell yield.
A protective structure of a cylindrical battery is designed, including a housing and a cover plate. The housing is provided with a cavity for loading the battery cell and a trapezoidal table for limiting the cover plate. The outer peripheral surface of the cover plate is arranged at a distance from the vertical surface of the trapezoidal table to form a notch for surface welding, and a first groove for accommodating the beads and/or slag generated by surface welding is provided below the notch of the housing.
Through this protective structure, the molten beads and/or slag generated during the surface welding can flow into the first groove along the notch, avoid falling into the cell cavity, improve the yield of the cell, and solve the problem of low cell yield.
Smart Images
Figure CN222826506U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a protective structure of a cylindrical battery, a battery monomer, an energy storage device and electrical equipment. Background Art
[0002] As a carrier for storing electrical energy, batteries can be used to store and transport the electricity produced by power plants, which is of great significance to the development of the new energy industry. Among them, cylindrical lithium batteries have the advantages of high production yield, good consistency, and high degree of production automation. They have significant advantages in the field of electric vehicles and are expected to become the optimal solution for mid-to-high-end electric vehicles.
[0003] At present, in the existing cylindrical lithium battery production lines, the connection methods between the cylindrical shell and the cover plate include side welding and surface welding. Conventional side welding adopts the method of keeping the laser stationary and rotating the battery cell to achieve welding. However, in the actual production process, due to the manufacturing and transportation of the round shell itself, the roundness and coaxiality of the round shell will be too large, and the distance between the laser welding and the workpiece is strongly related, which makes it easy for the cover plate and the round shell to be welded poorly. Compared with side welding, surface welding eliminates the need to lay the battery cell flat, and is more efficient and more fault-tolerant, which can effectively improve the welding quality rate.
[0004] However, the conventional cylindrical shell surface welding structure has the problem that the molten beads and / or slag generated by welding easily flow into the interior of the battery cell, resulting in a low yield rate of the produced battery cells. Utility Model Content
[0005] A technical problem to be solved by the utility model is: to provide a protective structure for a cylindrical battery, a battery cell, an energy storage device and an electrical equipment to solve the technical problem of low battery cell yield caused by the easy occurrence of molten beads and / or slag falling into the battery cell during the surface welding process of the existing cylindrical battery protective structure.
[0006] In order to solve the above technical problems, the first aspect of the embodiment of the utility model provides a protective structure of a cylindrical battery, the protective structure comprising:
[0007] The shell and the cover plate, the shell is provided with a cavity for loading the battery cell, a trapezoidal table top for limiting the cover plate is provided at the open end of the cavity, the bottom surface of the cover plate is built on the horizontal plane of the trapezoidal table top, the outer peripheral surface of the cover plate is spaced from the vertical surface of the trapezoidal table top to form a notch for surface welding; the shell is provided with a first groove in the depth direction below the notch for accommodating molten beads and / or slag generated by surface welding.
[0008] The protective structure of a cylindrical battery provided by the utility model is characterized in that a trapezoidal table top for erecting a cover plate is arranged on the shell, and the outer peripheral surface of the cover plate is arranged at an interval with the vertical surface of the trapezoidal table top to form a notch for surface welding, and a first groove for accommodating molten beads and / or slag generated by surface welding is provided in the depth direction below the shell corresponding to the notch, so that the molten beads and / or slag generated during the surface welding of the shell and the cover plate by the protective structure can flow into the first groove along the notch, thereby preventing the molten beads and / or slag from falling into the cavity accommodating the battery cell during the surface welding process, resulting in a low battery cell yield, thereby solving the technical problem of low battery cell yield caused by molten beads and / or slag falling into the battery cell during the surface welding process of the existing cylindrical battery protective structure.
[0009] Preferably, the shell includes a plurality of trapezoidal table surfaces, and the plurality of trapezoidal table surfaces extend radially inward layer by layer along the depth direction, and the first groove is at least arranged on the first trapezoidal table surface away from the depth direction.
[0010] Preferably, the cover plate matches the trapezoidal table top and is provided with a first step and a second step in sequence along the depth direction of the shell, and the first step, the second step and the trapezoidal table top are enclosed to form a second trough body.
[0011] Preferably, the depth of the second groove body is greater than the depth of the first groove.
[0012] Preferably, the cover plate is provided with a third step below the second step, and the outer peripheral surface of the extended end of the third step is provided with a chamfer inwardly along the radial direction thereof.
[0013] Preferably, the outer peripheral surface of the cover plate is spaced apart from the vertical surface of the trapezoidal table by a distance d, wherein d is 0.025-0.15 mm.
[0014] Preferably, the depth of the first groove is h1, wherein h1≥0.1 mm.
[0015] A second aspect of the embodiments of the present invention provides a battery cell, which includes a battery cell and a protective structure for a cylindrical battery according to any one of the above, wherein the battery cell is arranged in a shell of the protective structure.
[0016] A third aspect of the embodiments of the present utility model provides an energy storage device, which includes at least one of the above-mentioned battery cells.
[0017] A fourth aspect of the embodiments of the utility model provides an electrical device, which includes the above-mentioned battery cell or the above-mentioned energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a partial structural schematic diagram of the protection structure disclosed in the embodiment of the utility model;
[0020] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the overlapping structure of the protective structure shell and the cover plate;
[0021] Figure 3 yes Figure 1 Schematic diagram of the partial structure of the cover.
[0022] Description of reference numerals:
[0023] 1. Shell; 11. First boss; 12. First groove; 13. Second groove body; 2. Cover plate; 21. First step; 22. Second step; 23. Third step; 231. Chamfer; 3. Notch. DETAILED DESCRIPTION
[0024] The following is a further detailed description of the implementation of the utility model in conjunction with the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the utility model, but cannot be used to limit the scope of the utility model. The utility model can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0025] The utility model provides these embodiments to make the utility model thorough and complete, and to fully express the scope of the utility model to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values described in these embodiments should be interpreted as merely exemplary, rather than as limiting.
[0026] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "inner", "outer", "circumferential", "radial", etc., indicating the orientation or position relationship, 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.
[0027] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Horizontal" does not mean horizontal in the strict sense, but is within the tolerance range. "Including" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.
[0028] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "provided with", "erected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.
[0029] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.
[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.
[0031] like Figures 1 to 3 As shown, the utility model provides a protective structure for a cylindrical battery, the protective structure includes a shell 1 and a cover plate 2, the shell 1 is provided with a cavity for loading a battery cell, a trapezoidal table for limiting the cover plate 2 is provided at the open end of the cavity, the bottom surface of the cover plate 2 is arranged on the horizontal plane of the trapezoidal table, the outer peripheral surface of the cover plate 2 is arranged at intervals from the vertical surface of the trapezoidal table to form a notch 3 for surface welding; the shell 1 is provided with a first groove 12 for accommodating molten beads and / or slag generated by surface welding in the depth direction below the notch 3, and the notch 3 is connected to the first groove 12, so that the molten beads and / or slag generated by the shell and the cover plate of the protective structure during the surface welding process flow into the first groove 12 through the notch 3, so as to prevent the molten beads and / or slag from flowing into the cavity for loading the battery cell, thereby ensuring the quality of the battery cell. Among them, the width of the notch 3 is not greater than the width of the first groove 12.
[0032] The protective structure of a cylindrical battery provided by the utility model is provided with a trapezoidal table top for erecting a cover plate on the shell 1, and the outer peripheral surface of the cover plate 2 is spaced apart from the vertical surface of the trapezoidal table top to form a notch 3 for surface welding, and a first groove 12 for accommodating molten beads and / or slag generated by surface welding is provided in the depth direction below the shell 1 corresponding to the notch, so that the molten beads and / or slag generated during the surface welding of the shell and the cover plate of the protective structure can flow into the first groove along the notch, thereby preventing the molten beads and / or slag from falling into the cavity accommodating the battery cell during the surface welding process, resulting in a low battery cell yield, thereby solving the technical problem of low battery cell yield caused by the molten beads and / or slag falling into the battery cell during the surface welding process of the existing cylindrical battery protective structure.
[0033] In an optional embodiment of the utility model, the shell 1 includes a plurality of trapezoidal table surfaces, and the plurality of trapezoidal table surfaces extend radially inward layer by layer along the depth direction, and the first groove 12 is provided on at least the first trapezoidal table surface away from the depth direction. The provision of the plurality of trapezoidal table surfaces can effectively install the cover plate 2, and at the same time, the molten beads and / or slag generated by the surface welding of the shell 1 and the cover plate 2 along the notch 3 are blocked by the first groove 12 provided on the trapezoidal table surface and the layer-by-layer extension of the trapezoidal table surface, so as to prevent them from falling into the cavity of the shell 1 during the surface welding process, thereby avoiding the influence of the surface welding on the yield rate of the battery cell, ensuring the quality of the battery cell, and thus improving the production efficiency and production quality.
[0034] In an optional embodiment of the utility model, the cover plate 2 matches the trapezoidal table and is provided with a first step 21 and a second step 22 in sequence along the depth direction of the shell 1, wherein the first step 21, the second step 22 and the trapezoidal table are enclosed to form a second slot body 13, and the second slot body 13 is used to further prevent the molten beads and / or slag from flowing into the cavity when the molten beads and / or slag generated by the face welding overflow from the first groove 12. Further optionally, the first groove 12 is also provided below the second slot body 13 to further improve the barrier effect on the molten beads and / or slag generated during the face welding process, protect the battery cells in the shell 1 from being affected, and ensure the quality of the battery cells.
[0035] In a further optional embodiment of the utility model, the depth of the second trough body 13 is greater than the depth of the first groove 12 to ensure the strength of blocking the molten beads and / or slag generated during the face welding process. In detail, the first groove 12 can be used to block the molten beads and / or slag for the first time to slow down the flow speed and overflow direction of the molten beads and / or slag, and the second trough body 13 can accommodate the molten beads and / or slag in all directions on the basis of the blocking of the first groove 12, so the depth of the second trough body 13 is set to be greater than the depth of the first groove 12.
[0036] In an optional embodiment of the utility model, the cover plate 2 is provided with a third step 23 below the second step 22, and the outer peripheral surface of the extended end of the third step 23 is provided with a chamfer 231 radially inwardly. The setting of the chamfer 231 helps the cover plate 2 to enter the housing 1. The chamfer 231 can be a plane chamfer or a curved chamfer.
[0037] In an optional embodiment of the utility model, the outer peripheral surface of the cover plate 2 is spaced apart from the vertical surface of the trapezoidal table by a distance d, wherein d is 0.025-0.15 mm, to ensure the smoothness of the welding of the shell 1 and the cover plate 2 during the top-down surface welding process. Furthermore, the depth of the first groove 12 is h1, and the depth of the second groove body 13 is h2, wherein h2 ≥ h1, h1 ≥ 0.1, which can effectively ensure that the molten beads and / or slag flow into the first groove 12 and the second groove body 13 during the surface welding process.
[0038] In the preferred embodiment of the utility model, the shell 1 includes two stepped terraces extending in the depth direction along the open end thereof, and the cover plate 2 includes three steps matching the trapezoidal terrace of the shell 1, including a first step 21, a second step 22 and a third step 23 arranged in sequence, and the outer peripheral surface of the three steps is spaced apart from the vertical surface of the trapezoidal terrace to form a notch 3 for surface welding, and the interval distance is d, and d is 0.025-0.15mm, so as to ensure the smoothness of welding during the top-down surface welding process of the shell 1 and the cover plate 2. A first groove 12 with a depth of h1 is provided below the notch 3 formed by the first step 21 and the trapezoidal terrace, and h1≥0.1, which can effectively ensure that the molten beads and / or slag flow into the first groove 12 during the surface welding process. The setting of the first groove 12 enables the horizontal screen surface of the trapezoidal table where it is located and the adjacent vertical surface to form the first boss 11 for mounting the cover plate 2. The width of the first boss 11 can be set within a range according to the actual material strength to meet the surface welding operation of the cover plate 2 and the shell 1, that is, the connection strength requirements. The first step 21, the second step 22 and the trapezoidal table are enclosed to form a second trough body 13 with a depth of h2, where h2 ≥ h1, to ensure that the molten beads and / or slag overflowing from the first groove 12 are accommodated, and further prevent the molten beads and / or slag from moving into the cavity, avoid damage to the battery cell, and ensure the quality of the battery cell. Furthermore, the outer peripheral surface of the extended end of the third step 23 is provided with a chamfer 231 radially inward. The setting of the chamfer 231 helps the cover plate 2 to enter the shell 1.
[0039] A second aspect of the utility model provides a battery cell, which comprises a battery core and a protective structure for a cylindrical battery according to any one of the above, wherein the battery core is arranged in a shell of the protective structure.
[0040] The battery cell provided by the utility model is provided with a trapezoidal table top for erecting a cover plate on the shell of the protection structure, and the outer peripheral surface of the cover plate is spaced apart from the vertical surface of the trapezoidal table top to form a notch for surface welding, and a first groove for accommodating molten beads and / or slag generated by surface welding is provided in the depth direction below the shell corresponding to the notch, so that the molten beads and / or slag generated during the surface welding of the shell and the cover plate of the protection structure can flow into the first groove along the notch, avoiding the molten beads and / or slag from falling into the cavity accommodating the battery cell during the surface welding process, resulting in a low battery cell yield, thereby solving the technical problem of low battery cell yield caused by the molten beads and / or slag falling into the battery cell during the surface welding process of the existing cylindrical battery protection structure.
[0041] The third aspect of the utility model provides an energy storage device, which includes at least one of the above-mentioned battery cells. The energy storage device is provided with a trapezoidal table for erecting a cover plate on the shell of the protective structure of the battery cell, and the outer peripheral surface of the cover plate is spaced apart from the vertical surface of the trapezoidal table to form a notch for surface welding, and a first groove for accommodating molten beads and / or slag generated by surface welding is provided in the depth direction below the shell corresponding to the notch, so that the molten beads and / or slag generated during the surface welding of the shell and the cover plate of the protective structure can flow into the first groove along the notch, thereby avoiding the molten beads and / or slag falling into the cavity accommodating the battery cell during the surface welding process, resulting in a low battery cell yield, thereby solving the technical problem of low battery cell yield caused by the molten beads and / or slag falling into the battery cell due to the existing cylindrical battery protection structure during the surface welding process.
[0042] The fourth aspect of the utility model provides an electrical device, which includes the above-mentioned battery cell or the above-mentioned energy storage device. The electrical device is provided with a trapezoidal table for erecting a cover plate on the shell of the protective structure of the battery cell, and the outer peripheral surface of the cover plate is spaced apart from the vertical surface of the trapezoidal table to form a notch for surface welding, and a first groove for accommodating molten beads and / or slag generated by surface welding is provided in the depth direction below the shell corresponding to the notch, so that the molten beads and / or slag generated during the surface welding of the shell and the cover plate of the protective structure can flow into the first groove along the notch, avoiding the molten beads and / or slag falling into the cavity accommodating the battery cell during the surface welding process, resulting in a low battery cell yield, thereby solving the technical problem of low battery cell yield caused by the molten beads and / or slag falling into the battery cell due to the existing cylindrical battery protection structure being prone to fall into the battery cell during the surface welding process.
[0043] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.
[0044] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.
Claims
1. A protective structure for a cylindrical battery, characterized in that: The protective structure includes: The shell and the cover plate, the shell is provided with a cavity for loading the battery cell, a trapezoidal table top for limiting the cover plate is provided at the open end of the cavity, the bottom surface of the cover plate is built on the horizontal plane of the trapezoidal table top, the outer peripheral surface of the cover plate is spaced from the vertical surface of the trapezoidal table top to form a notch for surface welding; the shell is provided with a first groove in the depth direction below the notch for accommodating molten beads and / or slag generated by surface welding.
2. The protective structure according to claim 1, characterized in that: The shell comprises a plurality of trapezoidal table surfaces, which extend radially inward layer by layer along the depth direction, and the first groove is at least arranged on the first trapezoidal table surface which is away from the depth direction.
3. The protective structure according to claim 2, characterized in that: The cover plate matches the trapezoidal table top and is provided with a first step and a second step in sequence along the depth direction of the shell body. The first step, the second step and the trapezoidal table top are combined to form a second trough body.
4. The protective structure according to claim 3, characterized in that: The depth of the second groove body is greater than the depth of the first groove.
5. The protective structure according to claim 3, characterized in that: The cover plate is provided with a third step below the second step, and the outer peripheral surface of the extended end of the third step is provided with a chamfer inwardly along the radial direction.
6. The protective structure according to claim 1, characterized in that: The distance between the outer peripheral surface of the cover plate and the vertical surface of the trapezoidal table top is d, wherein d is 0.025-0.15 mm.
7. The protective structure according to claim 1, characterized in that: The depth of the first groove is h1, where h1≥0.1 mm.
8. A battery cell, characterized in that: The battery cell comprises a battery cell and a protective structure for a cylindrical battery according to any one of claims 1 to 7, wherein the battery cell is arranged in a housing of the protective structure.
9. An energy storage device, characterized in that: The energy storage device comprises at least one battery cell according to claim 8.
10. An electrical device, characterized in that: The electrical device comprises a battery cell according to claim 8 or an energy storage device according to claim 9 .