Battery structure

Abstract

The utility model provides a battery structure which comprises a shell, a collector plate and a battery cell, and an accommodating space is arranged in the shell; the current collecting disc is arranged in the accommodating space and is connected with the battery cell; the battery cell is arranged in the accommodating space, the battery cell comprises a first end part close to the current collecting plate, and a first notch is formed in the first end part in the circumferential direction so as to avoid at least one part of the circumferential side of the current collecting plate; in the bending forming process of the shell, the first notch can provide an avoiding space for the current collecting plate, so that the current collecting plate is prevented from being in contact with the battery cell in the downward extrusion process, the current collecting plate is prevented from extruding the battery cell, the battery cell is further prevented from being damaged, and the service life of the battery cell is prolonged. Therefore, the technical problem that the whole battery is scrapped when the shell of the battery passes through the rolling groove is solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a battery structure. Background Technology

[0002] In related technologies, the battery casing and the battery cell are often connected by a current collector. After the battery casing is grooved, an inner groove is formed at the upper end of the casing. In related technologies, the inner groove formed after the battery casing is grooved may be squeezed downwards and onto the battery cell inside the casing, which can easily damage the battery cell or even render the entire battery unusable. Utility Model Content

[0003] The present invention provides a battery structure that can improve the technical problem of damage to the battery cell caused by the downward squeezing of the outer casing after it passes through the rolling groove.

[0004] An embodiment of this utility model provides a battery structure, including:

[0005] The outer shell has an internal storage space;

[0006] A collector plate is disposed within the accommodating space;

[0007] A battery cell is disposed within the receiving space and connected to the current collector. The battery cell includes a first end near the current collector, the first end having a first notch along the circumferential direction to avoid at least a portion of the periphery of the current collector.

[0008] In one embodiment, the outer diameter of the first end is D1, and the maximum diameter of both ends of the battery cell is D2, where 80% ≤ D1 / D2 ≤ 100%.

[0009] In one embodiment, the depth of the first notch along the axial direction of the housing is H1, where 0 < H1 ≤ 5 mm.

[0010] In one embodiment, the first gap is filled with a support member to support the collector plate.

[0011] In one embodiment, the first notch is filled with hot melt adhesive.

[0012] In one embodiment, the width of the non-tab region of the battery cell is W, where 0.1mm ≤ W ≤ 10mm.

[0013] In one embodiment, the diameter of the tab region of the battery cell is D3, and 60% ≤ D3 / D2 ≤ 100%.

[0014] In one embodiment, the height of the battery cell along the axial direction of the housing is H2, where 0 < H1 / H2 ≤ 0.03.

[0015] In one embodiment, the current collector includes a disk body and a connector, the disk body being connected to the battery cell and the connector being connected to the outer casing.

[0016] In one embodiment, the connector is fixed to the side of the disk body opposite to the battery cell and connected to the outer casing.

[0017] In one embodiment, the lower side portion of the connector is located above the opening area of ​​the first notch.

[0018] In one embodiment, the curvature of the side of the connector near the battery cell is the same as the curvature of the outer periphery of the disk.

[0019] In one embodiment, the arc of the side of the connector closest to the battery cell is A, where 5°≤A≤360°.

[0020] In one embodiment, an assembly gap is provided between the connector and the housing, and the distance of the assembly gap is L, where 0mm < L ≤ 2mm.

[0021] In one embodiment, a notch is formed between the first notch and the housing, and the connector is at least partially located within the notch.

[0022] The beneficial effects of the embodiments of this utility model are as follows:

[0023] In an embodiment of this utility model, the outer casing bends at its upper end after passing through the grooving, causing the current collector connected to the outer casing to also bend downwards. Since the battery cell includes a first end near the current collector and the first end has a first notch along the circumferential direction, the first notch can provide a clearance space for the current collector during the bending process of the outer casing, thereby preventing the current collector from contacting the battery cell during the downward pressing process, avoiding the current collector from squeezing the battery cell, and thus avoiding damage to the battery cell. This improves the technical problem of the entire battery being scrapped during the process of the battery casing passing through the grooving.

[0024] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1This is a three-dimensional schematic diagram of a battery sealing structure provided by an embodiment of the present utility model;

[0027] Figure 2 It is at Figure 1 A magnified view of a section at point A;

[0028] Figure 3 This is a 3D schematic diagram of the collector plate;

[0029] Figure 4 It is a three-dimensional schematic diagram showing that the connector and the inside of the notch are completely avoided;

[0030] Figure 5 This is a three-dimensional schematic diagram of an embodiment where the connector avoids the inner part of the notch;

[0031] Figure 6 This is a three-dimensional schematic diagram of Embodiment 2, in which the connector avoids the inner part of the notch.

[0032] Figure Labels

[0033] 100. Battery;

[0034] 1. Collector plate; 11. Plate body; 12. Connecting parts;

[0035] 2. Battery cell; 21. First end; 22. First notch;

[0036] 3. Outer shell; 31. Reception space; 32. Notch. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0038] Reference Figure 1 and Figure 2 As shown, this application provides a battery 100 structure, including a casing 3, a current collector 1, and a battery cell 2;

[0039] The outer shell 3 has a receiving space 31 inside;

[0040] The collector plate 1 is disposed within the accommodating space 31;

[0041] The battery cell 2 is disposed in the receiving space 31 and connected to the current collector 1. The battery cell 2 includes a first end 21 near the current collector 1. The first end 21 is provided with a first notch 22 in the circumferential direction to avoid at least a portion of the periphery of the current collector 1.

[0042] In this embodiment, there is a gap between the outer shell 3 and the battery cell 2 along the radial direction of the outer shell 3. Therefore, it is convenient to assemble the battery cell 2 with the outer shell 3, and at the same time, it avoids damage to the outer shell 3 or the battery cell 2 due to friction during the assembly process, thus ensuring assembly cost.

[0043] It should also be noted that, in specific implementation, the first end 21 can be provided on one end surface of the battery cell 2 near the current collector 1 and protruding towards the current collector 1 along the axial direction of the battery cell 2, and the diameter of the first end 21 is made smaller than the diameter of the battery cell 2, thereby forming the first gap 22 between the first end 21 and the battery cell 2 to avoid at least a portion of the periphery of the current collector 1.

[0044] In this embodiment of the invention, the outer casing 3 bends at its upper end after passing through the grooving, causing the current collector 1 connected to the outer casing 3 to also bend downwards. Since the battery cell 2 includes a first end 21 near the current collector 1, and the first end 21 has a first notch 22 along its circumference, the first notch 22 provides a clearance space for the current collector 1 during the bending process of the outer casing 3. This prevents the current collector 1 from contacting the battery cell 2 during downward compression, avoiding pressure on the battery cell 2 and thus preventing damage. This improves the technical problem of the entire battery 100 being scrapped during the grooving process of the outer casing 3 of the battery 100.

[0045] In some embodiments, the outer diameter of the first end 21 is D1, and the maximum diameter of both ends of the battery cell 2 is D2, where 80% ≤ D1 / D2 ≤ 100%. In specific implementations, by setting the above parameters, the width of the first notch 22 along the radial direction of the battery cell 2 can be limited, ensuring that the width of the first notch 22 is sufficient to create clearance space for the current collector 1. This guarantees the clearance effect of the first notch 22 on the current collector 1, preventing the current collector 1 from squeezing the battery cell 2, thereby preventing damage to the battery cell 2 and preventing the entire battery 100 from being scrapped during the rolling process of the battery casing 3.

[0046] Furthermore, it also prevents the width of the first notch 22 along the radial direction of the cell 2 from being too large, thereby avoiding affecting the range of the tab connection area of ​​the cell 2 and ensuring the connection between the cell 2 and the current collector 1. At the same time, it also avoids the impact on the current carrying capacity of the cell 2 due to the tab connection area being too small, thereby ensuring the performance of the cell 2.

[0047] In some embodiments, the depth of the first notch 22 along the axial direction of the outer casing 3 is H1, where 0 < H1 ≤ 5 mm. By setting the above parameters, it is possible to prevent the current collector 1 from colliding with the battery cell 2 after bending due to an insufficient depth of the first notch 22. This ensures that a clearance space is formed between the first notch 22 and the outer casing 3, allowing the current collector 1 to avoid collisions. Simultaneously, it also prevents the first notch 22 from being too deep, thus avoiding any impact on the structural stability of the battery cell 2, ensuring the overall performance of the battery cell 2, and consequently guaranteeing the lifespan of the entire battery 100.

[0048] In some embodiments, the first notch 22 is filled with a support member to support the current collector 1. During assembly, a plastic part can be filled into the first notch 22 to support the current collector 1, preventing damage during the grooving process and ensuring the normal operation of the battery 100.

[0049] In some embodiments, the first notch 22 is filled with hot melt adhesive, i.e., the support is made of hot melt adhesive. By filling the first notch 22 with adhesive, the current collector 1 can be supported, preventing damage to the current collector 1 during the grooving process and ensuring the normal use of the battery 100.

[0050] In some embodiments, the width of the non-tab region of the battery cell 2 is W, where 0.1mm ≤ W ≤ 10mm. By setting these parameters, it is possible to avoid the non-tab region being too wide, thus making the tab region too narrow; conversely, it is also possible to avoid the non-tab region being too narrow, thus making the tab region too wide. In other words, it ensures that the widths of both the non-tab region and the tab region of the battery cell 2 are moderate, thereby avoiding any impact on the overcurrent capacity of the battery cell 2 and ensuring the overall performance of the battery cell 2.

[0051] In some embodiments, the diameter of the tab region of the battery cell 2 is D3, and 60% ≤ D3 / D2 ≤ 100%. By setting the above parameters, it is possible to avoid the tab region being too wide, which would result in the non-tab region being too narrow; at the same time, it is also possible to avoid the tab region being too narrow, which would result in the non-tab region being too wide. In other words, it is possible to ensure that the range of the tab region of the battery cell 2 is moderate, which not only ensures the connection between the battery cell 2 and the current collector 1, but also avoids affecting the current carrying capacity of the battery cell 2, thus ensuring the overall performance of the battery cell 2.

[0052] In some embodiments, the height of the battery cell 2 along the axial direction of the outer casing 3 is H2, where 0 < H1 / H2 ≤ 0.03. In specific implementations, by setting the above parameters, it is possible to avoid the first notch 22 being too large, thereby preventing interference with the rest of the battery cell 2's structure. Therefore, it is possible to prevent any impact on the overall structure of the battery cell 2, further ensuring the overall performance of the battery cell 2.

[0053] In some embodiments, refer to Figure 3 As shown, the current collector 1 includes a disk body 11 and a connector 12. The disk body 11 is connected to the battery cell 2, and the connector 12 is connected to the outer casing 3. In the specific assembly process, the outer casing 3 of the battery 100 and the tabs of the battery cell 2 often use two different metal materials. Therefore, it is often necessary to connect the outer casing 3 of the battery 100 and the battery cell 2 through the current collector 1. The disk body 11 is used to connect to the battery cell 2, and the connector 12 is used to connect to the outer casing 3, thereby realizing the connection between the outer casing 3 and the battery cell 2.

[0054] In this embodiment, the disk body 11 is circular for use in connection with the circular battery cell 2.

[0055] In some embodiments, the connector 12 is fixed to the side of the disc 11 opposite to the battery cell 2 and connected to the outer casing 3. This arrangement enables communication between the connector 12 and the outer casing 3, and between the disc 11 and the battery cell 2, thus achieving electrical connection between the outer casing 3 and the battery cell 2 and ensuring the normal operation of the battery 100.

[0056] It is understood that in this embodiment, multiple connectors 12 are provided, and the multiple connectors 12 are arranged circumferentially at intervals on the disk body 11, and are all welded to the disk body 11. This ensures the connection stability between the connectors 12 and the outer casing 3 of the battery 100, thereby ensuring the normal operation of the entire battery 100.

[0057] In specific implementation, there are three connectors 12.

[0058] In some embodiments, the lower side portion of the connector 12 is located above the opening area of ​​the first notch 22. With this configuration, when the housing 3 is rolled and bent downwards, causing the connector 12 to bend downwards, the lower side portion of the connector 12 is located above the opening area of ​​the first notch 22, ensuring that the first notch 22 forms a clearance space for the connector 12. This ensures that the connector 12 can smoothly fall into the area formed by the first notch 22 when pressed down, thereby preventing the connector 12 from squeezing the battery cell 2 during the pressing process and thus avoiding damage to the battery cell 2.

[0059] In some embodiments, the curvature of the side of the connector 12 closest to the battery cell 2 is the same as the outer circumferential curvature of the disk body 11.

[0060] In some embodiments, the arc of the side of the connector 12 closest to the battery cell 2 is A, where 5°≤A≤360°.

[0061] It is understood that when the arc of the connector 12 on the side close to the battery cell 2 is 360°, that is, the side of the connector 12 close to the battery cell 2 is circular; that is, when the arc of the connector 12 on the side close to the battery cell 2 is 360°, the connector 12 is provided and is arranged in a ring around the outer periphery of the disk body 11.

[0062] In practical implementation, the actual number of connectors 12 can be adjusted by adjusting the curvature of the side of the connector 12 closest to the battery cell 2, so as to set according to the actual application needs, ensuring the connection strength between the outer shell 3 and the connector 12, which is highly reliable and has a wide range of applications.

[0063] It should also be noted that, in some embodiments, in order to ensure the welding quality between the connector 12 and the outer shell 3, the curvature of the side of the connector 12 close to the outer shell 3 is consistent with the curvature of the inner wall of the outer shell 3, so that the distance between each part of the connector 12 and the inner wall of the outer shell 3 is consistent, and the welding reliability is strong.

[0064] In some embodiments, an assembly gap is provided between the connector 12 and the outer casing 3, the distance of which is L, 0mm < L ≤ 2mm. This assembly gap prevents damage caused by friction between the connector 12 and the outer casing 3 during assembly. Therefore, it facilitates the assembly of the connector 12 and the outer casing 3, improving the production efficiency of the battery 100. Furthermore, an assembly gap of 0mm < L ≤ 2mm prevents the gap between the connector 12 and the outer casing 3 from becoming too large, thus avoiding waste of the internal storage space 31 of the outer casing 3 and ensuring the efficient utilization of the internal storage space 31 of the outer casing 3.

[0065] In some embodiments, a notch 32 is formed between the first notch 22 and the housing 3, and the connector 12 is at least partially located within the notch 32.

[0066] In this embodiment, the connector 12 includes two connecting parts with different extending directions, one of which is connected to the outer shell 3 and the other connecting part is connected to the disk body 11.

[0067] In the specific implementation process, refer to Figure 2As shown, after the outer casing 3 of the battery 100 is grooved, it is bent inward and the connector 12 is bent inward at the same time. At this time, a notch 32 is formed between the first notch 22 and the outer casing 3. The two connecting parts of the connector 12 overlap with the side end face of the notch 32 inside the outer casing 3, thereby ensuring the connection between the connector 12 and the outer casing 3 and ensuring the normal use of the entire battery 100.

[0068] In other embodiments, refer to Figure 4 As shown, in the specific configuration, after the outer casing 3 of the battery 100 is grooved, it is bent inward, causing the connector 12 to bend inward simultaneously. At this time, a notch 32 is formed between the first notch 22 and the outer casing 3. Both connecting parts of the connector 12 are located within the notch 32, that is, the end of the connector 12 closest to the cell 2 avoids the notch 32 located on one side of the inner surface of the outer casing 3. Through the above configuration, along the axial direction of the outer casing 3, since the connector 12 is entirely located within the notch 32, the thickness of the two connecting parts of the connector 12 can be reduced along the axial direction of the outer casing 3. This ensures that the cell 2 does not occupy the space along the axial direction of the cell 2, thus guaranteeing the space utilization rate of the internal accommodating space 31 of the outer casing 3.

[0069] In other words, with the same accommodating space 31 within the outer casing 3, the above-mentioned arrangement allows for the storage of more battery cells 2 within the outer casing 3. Therefore, this not only improves the performance of the battery 100 but also increases the space utilization of the accommodating space 31 within the outer casing 3, resulting in greater practicality and better battery performance.

[0070] In other embodiments, refer to Figure 5 and Figure 6 As shown, in a specific configuration, after the outer casing 3 of the battery 100 is grooved, it is bent inward and simultaneously causes the connector 12 to bend inward. At this time, a notch 32 is formed between the first notch 22 and the outer casing 3. The part of the connector 12 connected to the outer casing 3 may be located in the notch 32, and the part of the connector 12 connected to the disc 11 may overlap with one side end face located inside the outer casing 3. Alternatively, the part of the connector 12 connected to the disc 11 may be located in the notch 32, and the part of the connector 12 connected to the outer casing 3 may overlap with one side end face located inside the outer casing 3.

[0071] Therefore, through the above arrangement, the thickness of a connecting part can be reduced in the axial direction of the outer casing 3, thereby reducing the space occupied by the connector 12 in the axial direction of the cell 2 and ensuring the space utilization rate of the internal accommodating space 31 of the outer casing 3.

[0072] It should also be further explained that, during the specific assembly process, the connector 12 is welded to the end face of the recess 32 located inside the outer shell 3.

[0073] It is understandable that, in the specific implementation process, the specific dimensions of the connector 12 before assembly can be adjusted to adjust the degree of overlap between the connector 12 and the side end face of the recess 32 inside the outer shell 3 after bending, so that after the outer shell 3 is bent by the groove, the connector 12 can fall smoothly into the area of ​​the recess 32 without occupying the overall space above the battery cell 2.

[0074] Of course, in other embodiments, the width of the first notch 22 along the direction of the cell 2 can be adjusted to adjust the degree of overlap between the connector 12 and the side end face of the recess 32 inside the outer shell 3 after the connector 12 is bent, so that after the outer shell 3 is bent by the groove, the connector 12 can fall smoothly into the area of ​​the recess 32 without occupying the overall space above the cell 2.

[0075] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery structure, characterized in that, include: The outer shell has an internal storage space; A collector plate is disposed within the accommodating space; A battery cell is disposed within the receiving space and connected to the current collector. The battery cell includes a first end near the current collector, the first end having a first notch in the circumferential direction to avoid at least a portion of the periphery of the current collector.

2. The battery structure according to claim 1, characterized in that, The outer diameter of the first end is D1, and the maximum diameter of both ends of the battery cell is D2, where 80% ≤ D1 / D2 ≤ 100%.

3. The battery structure according to claim 1, characterized in that, Along the axial direction of the outer shell, the depth of the first notch is H1, where 0 < H1 ≤ 5 mm.

4. The battery structure according to claim 1, characterized in that, The first gap is filled with a support member to support the collection plate.

5. The battery structure according to claim 4, characterized in that, The first notch is filled with hot melt adhesive.

6. The battery structure according to any one of claims 1-3, characterized in that, The width of the non-tab region of the battery cell is W, where 0.1mm ≤ W ≤ 10mm.

7. The battery structure according to any one of claims 1-3, characterized in that, The diameter of the tab region of the battery cell is D3, and 60% ≤ D3 / D2 ≤ 100%.

8. The battery structure according to any one of claims 1-3, characterized in that, Along the axial direction of the outer casing, the height of the battery cell is H2, where 0 < H1 / H2 ≤ 0.

03.

9. The battery structure according to claim 1, characterized in that, The current collector includes a disk body and a connector. The disk body is connected to the battery cell, and the connector is connected to the outer casing.

10. The battery structure according to claim 9, characterized in that, The connector is fixed to the side of the disk body away from the battery cell and is connected to the outer casing.

11. The battery structure according to any one of claims 9-10, characterized in that, The lower side portion of the connector is located above the opening area of ​​the first notch.

12. The battery structure according to any one of claims 9-10, characterized in that, The curvature of the connector on the side closest to the battery cell is the same as the curvature of the outer periphery of the disk.

13. The battery structure according to claim 12, characterized in that, The arc of the connector on the side closest to the battery cell is A, where 5°≤A≤360°.

14. The battery structure according to any one of claims 9-10, characterized in that, An assembly gap is provided between the connector and the outer shell, and the distance of the assembly gap is L, where 0mm < L ≤ 2mm.

15. The battery structure according to claim 11, characterized in that, A notch is formed between the first notch and the outer shell, and the connector is at least partially located within the notch.

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