Battery cell, battery and electric equipment

Abstract

The utility model provides a battery cell, a battery and electric equipment. The battery cell comprises a shell and a battery cell body, an installation cavity is formed in the shell, the battery cell body is installed in the installation cavity, at least two second reinforcing ribs are formed on the inner bottom wall of the shell, and the at least two second reinforcing ribs are evenly distributed in the circumferential direction of the center point of the inner bottom wall of the shell. According to the battery cell, the inner bottom wall of the shell can be effectively prevented from protruding outwards when the battery cell body expands, the height of the battery cell is prevented from being increased, the quality of the battery cell is ensured, and the percent of pass of the battery cell is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0002] The battery cell is a core component of a battery, and is widely used in energy storage systems, vehicles and consumer electronics.

[0003] In the related art, when the battery cell expands internally, the battery cell will protrude outward and increase in height, affecting the quality of the battery cell and causing the battery cell to be unqualified. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a battery cell, a battery and an electric device, which can improve the technical problem that the battery cell will protrude outward and increase in height when the battery cell expands internally.

[0005] In a first aspect, embodiments of the present application provide a battery cell, comprising:

[0006] a shell, which forms a mounting cavity;

[0007] a battery cell body, which is mounted in the mounting cavity;

[0008] wherein an inner bottom wall of the shell forms at least two second reinforcing ribs, and the at least two second reinforcing ribs are uniformly arranged along a center point of the inner bottom wall of the shell in a circumferential direction.

[0009] In an embodiment, the second reinforcing rib is arranged at a distance from an edge of the bottom wall of the shell.

[0010] In an embodiment, along an axial direction of the shell, a projection of the second reinforcing rib on the bottom wall of the shell is located within a projection of the battery cell body on the bottom wall of the shell.

[0011] In an embodiment, the second reinforcing rib is an arc-shaped reinforcing rib, a gap is provided between adjacent two arc-shaped reinforcing ribs, and along a radial direction of the shell, the width of the gap is constant.

[0012] In an embodiment, the inner diameter of the second reinforcing rib is greater than 6 mm.

[0013] In an embodiment, the outer diameter of the second reinforcing rib is L1, and the diameter of the battery cell body is L2, wherein L1 < L2-2 mm.

[0014] In an embodiment, along the axial direction of the shell, the height of the second reinforcing rib is less than 0.08 mm.

[0015] In an embodiment, the battery cell further comprises a negative busbar, the negative busbar is formed with a boss, the boss is connected with the bottom wall of the shell, and the height of the second reinforcing rib is less than the height of the boss along the axial direction of the shell.

[0016] In an embodiment, at least two second reinforcing ribs are arranged around the boss and are spaced apart from the boss.

[0017] In a second aspect, the embodiments of the present application provide a battery comprising the battery cell.

[0018] In a third aspect, the embodiments of the present application provide a power consumption device comprising the battery.

[0019] The embodiments of the present application have the following beneficial effects:

[0020] In the embodiments of the present application, the second reinforcing rib is formed on the inner bottom wall of the shell, which can effectively improve the structural strength of the inner bottom wall of the shell, effectively prevent the inner bottom wall of the shell from bulging outward when the battery cell body expands, avoid increasing the height of the battery cell, ensure the quality of the battery cell, and ensure the qualified rate of the battery cell. Meanwhile, the at least two second reinforcing ribs are evenly arranged along the circumference of the neutral point of the inner bottom wall, and the uniformity of the arrangement of the second reinforcing ribs ensures the uniformity of the strengthening of the structural strength of the inner bottom wall of the shell, which is conducive to improving the overall strength of the inner bottom wall of the shell and avoiding the situation that part of the inner bottom wall has low strength. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0022] Figure 1 is one of the structural schematic diagrams of the battery cell provided by the embodiments of the present application;

[0023] Figure 2 is one of the structural schematic diagrams of the shell provided by the embodiments of the present application;

[0024] Figure 3 is the second structural schematic diagram of the shell provided by the embodiments of the present application;

[0025] Figure 4 is the second structural schematic diagram of the battery cell provided by the embodiments of the present application;

[0026] Figure 5 is the sectional view of the battery cell provided by the embodiments of the present application;

[0027] Figure 6 The structure amplification schematic view in A of the embodiment of the present application is provided Figure 5 The structure amplification schematic view in A of the embodiment of the present application is provided DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the outline of the device.

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the outline of the device. Figures 1 to 6 The battery and the power consumption device of the present application are described.

[0030] According to the embodiments of the first aspect of the present application, the battery and the power consumption device of the present application are described. Figure 4 and Figure 5 The battery and the power consumption device of the present application are described.

[0031] It can be understood that by forming the second reinforcing ribs 16 on the inner bottom wall of the shell 1, the second reinforcing ribs 16 can effectively improve the structural strength of the inner bottom wall of the shell 1, and can effectively prevent the inner bottom wall of the shell 1 from bulging outward when the battery body 2 expands, avoid increasing the height of the battery, ensure the quality of the battery, and ensure the qualified rate of the battery. At the same time, the at least two second reinforcing ribs 16 are uniformly arranged along the circumference of the neutral point of the inner bottom wall, and the uniformity of the arrangement of the second reinforcing ribs 16 ensures the uniformity of the strengthening of the structural strength of the inner bottom wall of the shell 1, which is beneficial to improving the overall strength of the inner bottom wall of the shell 1 and avoiding the situation that part of the inner bottom wall has low strength.

[0032] In some embodiments, such as Figure 4 and Figure 5 The second reinforcing ribs 16 are arranged in a spaced manner with the edge of the bottom wall of the shell 1.

[0033] It can be understood that the second reinforcing rib 16 and the edge of the bottom wall of the shell 1 have a certain distance, which facilitates the formation of the second reinforcing rib 16 and will not be affected by the edge of the bottom wall.

[0034] It can be understood that the edge of the bottom wall is half of a circular arc structure. If the second reinforcing rib 16 is connected with the edge of the bottom wall, the edge of the bottom wall may be affected when the second reinforcing rib 16 is formed by stamping, thereby affecting the overall structure of the shell 1.

[0035] In some embodiments, along the axial direction of the shell 1, the orthographic projection of the second reinforcing rib 16 on the bottom wall of the shell 1 is located within the orthographic projection of the battery core body 2 on the bottom wall of the shell 1.

[0036] It can be understood that the second reinforcing rib 16 is directly opposite the battery core body 2, that is, the part of the inner bottom wall provided with the second reinforcing rib 16 is also directly opposite the battery core body 2, and the structural strength of the part of the inner bottom wall provided with the second reinforcing rib 16 is greater. That is, the second reinforcing rib 16 is arranged at the part of the inner bottom wall which will be affected by the expansion force of the battery core body 2, thereby effectively preventing the inner bottom wall from being bulged under the action of the expansion force of the battery core body 2.

[0037] In some embodiments, as shown in Figure 4 and Figure 5 , the second reinforcing rib 16 is an arc-shaped reinforcing rib, and a gap 17 is provided between adjacent two arc-shaped reinforcing ribs, and the width of the gap 17 is constant along the radial direction of the shell 1.

[0038] It can be understood that when the second reinforcing rib 16 is arc-shaped, the area of the inner bottom wall provided with the second reinforcing rib 16 can be increased, that is, the arc-shaped reinforcing rib can more effectively improve the structural strength of the inner bottom wall of the shell 1.

[0039] The constant width of the gap 17 between adjacent two arc-shaped reinforcing ribs can improve the uniformity of the structural strength of the inner bottom wall of the shell 1.

[0040] In some embodiments, the inner diameter of the second reinforcing rib 16 is greater than 6 mm.

[0041] It can be understood that in a full-tab battery, the battery core body 2 includes a negative bus bar 3 which needs to be connected with the shell 1. If the inner diameter of the second reinforcing rib 16 is less than 6 mm, the second reinforcing rib 16 will interfere with the installation and connection of the negative bus bar 3. Therefore, the inner diameter of the second reinforcing rib 16 is set to be greater than 6 mm in the present application, which ensures the structural strength of the inner bottom wall of the shell 1 while avoiding interference with the negative bus bar 3.

[0042] In some embodiments, the outer diameter of the second reinforcing rib 16 is L1, and the diameter of the battery core body 2 is L2, wherein L1 < L2-2 mm.

[0043] It can be understood that if the outer diameter of the second reinforcing rib 16 is greater than the diameter of the battery body 2, the second reinforcing rib 16 will extend to the fillet of the bottom wall of the shell 1, affect the overall structure of the shell 1, and is not conducive to the formation of the second reinforcing rib 16; if the outer diameter of the second reinforcing rib 16 is greater than the diameter of the battery body 2 minus 2mm, the distance between the second reinforcing rib 16 and the fillet of the bottom wall of the shell 1 is too close, which is not conducive to the formation of the second reinforcing rib 16. Therefore, the outer diameter of the second reinforcing rib 16 is set to be less than the diameter of the battery body 2 minus 2mm, which ensures the structural strength of the inner bottom wall while ensuring the convenience of the formation of the second reinforcing rib 16.

[0044] In some embodiments, along the axial direction of the shell 1, the height of the second reinforcing rib 16 is less than 0.08mm.

[0045] It can be understood that if the height of the second reinforcing rib 16 is greater than 0.08mm, it will have a greater impact on the overall height of the battery. Therefore, the height of the second reinforcing rib 16 is set to be less than 0.08mm, which ensures the structural strength of the inner bottom wall of the shell 1 while reducing the impact on the overall height of the battery.

[0046] In the full-tab battery, the battery body 2 includes a negative bus plate 3, which needs to be connected with the shell 1. If the height of the second reinforcing rib 16 is greater than 0.08mm, the second reinforcing rib 16 will interfere with the installation and connection of the negative bus plate 3. Therefore, the height of the second reinforcing rib 16 is set to be less than 0.08mm, which ensures the structural strength of the inner bottom wall of the shell 1 while avoiding interference with the negative bus plate 3.

[0047] In some embodiments, as shown in Figure 5 and Figure 6 , the battery further includes a negative bus plate 3, and the negative bus plate 3 is formed with a boss 31 connected with the bottom wall of the shell 1, wherein along the axial direction of the shell 1, the height of the second reinforcing rib 16 is less than the height of the boss 31.

[0048] It can be understood that by setting the height of the second reinforcing rib 16 to be less than the height of the boss 31 of the negative bus plate 3, the second reinforcing rib 16 will not affect the connection between the boss 31 of the negative bus plate 3 and the shell 1, avoiding interference of the second reinforcing rib 16 with the negative bus plate 3.

[0049] For example, the height of the second reinforcing rib 16 is 0.08mm, and the height of the negative bus plate 3 is 0.1mm.

[0050] In some embodiments, as shown in Figure 5 and Figure 6At least two second reinforcing ribs 16 are arranged around the boss 31, and the second reinforcing ribs 16 are arranged in a spaced manner with the boss 31.

[0051] It can be understood that the second reinforcing ribs 16 are arranged around the boss 31, that is, the boss 31 of the negative bus plate 3 does not need to be connected with the shell 1 through the second reinforcing ribs 16, and the boss 31 of the negative bus plate 3 can be normally connected with the shell 1, thereby avoiding affecting the height of the battery cell.

[0052] It can be understood that if the second reinforcing ribs 16 are arranged in a spaced manner with the boss 31, that is, the boss 31 is connected with the second reinforcing ribs 16, at this time, the height of the battery cell will be increased.

[0053] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 , the shell 1 comprises a side wall 12 and at least two first reinforcing ribs 13, the first reinforcing ribs 13 are connected to the side wall 12, and the at least two first reinforcing ribs 13 are uniformly arranged along the circumference of the battery cell body 2.

[0054] It can be understood that by connecting the first reinforcing ribs 13 at the side wall 12 of the shell 1, the first reinforcing ribs 13 can effectively improve the structural strength of the side wall 12 of the shell 1, and can effectively prevent the side wall 12 of the shell 1 from bulging outward when the battery cell body 2 expands, thereby avoiding the increase of the diameter of the battery cell, ensuring the quality of the battery cell and the qualified rate of the battery cell. At the same time, the at least two first reinforcing ribs 13 are uniformly arranged along the circumference of the battery cell body 2, and the uniformity of the arrangement of the first reinforcing ribs 13 ensures the uniformity of the strengthening of the structural strength of the side wall 12 of the shell 1, which is beneficial to improving the overall strength of the side wall 12 of the shell 1 and avoiding the situation that some side walls 12 have low strength.

[0055] For example, the shell 1 comprises four first reinforcing ribs 13, and the four first reinforcing ribs 13 are uniformly arranged along the circumference of the battery cell body 2.

[0056] In some embodiments, the first reinforcing ribs 13 are formed on the inner side wall of the shell 1, and the first reinforcing ribs 13 abut against the battery cell body 2.

[0057] It can be understood that the first reinforcing ribs 13 are connected to the side of the side wall 12 facing the battery cell body 2 and abut against the battery cell body 2, and the first reinforcing ribs 13 can increase the bending resistance of the inner side wall of the shell 1, and can effectively prevent the battery cell from bulging out of the side wall 12.

[0058] In some examples, the first reinforcing ribs 13 are made of insulating material, or an insulating member is arranged at the abutting position of the first reinforcing ribs 13 and the shell 1, for example, an insulating layer is arranged on the outer wall surface of the battery cell body 2.

[0059] In some embodiments, such asFigure 2 and Figure 3 The shell 1 comprises a main body portion 14 and a sealing portion 15 connected to each other, the first reinforcing rib 13 is formed on the side wall surface of the main body portion 14, and the first reinforcing rib 13 is arranged adjacent to or spaced apart from the sealing portion 15.

[0060] It can be understood that the first reinforcing rib 13 is arranged on the side wall surface of the main body portion 14, and the first reinforcing rib 13 is not arranged on the sealing portion 15. Further, while the structural strength of the side wall 12 of the shell 1 is improved by the first reinforcing rib 13, the sealing of the shell 1 is not affected.

[0061] After the formation of the battery cell, the sealing portion 15 is bent towards the center of the mounting cavity 11. That is, the main body portion 14 is mainly subjected to the bulging of the battery cell body 2, and the first reinforcing rib 13 is arranged on the main body portion 14 to improve the structural strength of the main body portion 14, and the first reinforcing rib 13 is not arranged on the sealing portion 15 to avoid affecting the sealing operation of the shell 1 due to the increase in the structural strength of the sealing portion 15.

[0062] In some embodiments, as Figure 1 and Figure 2 The length of the first reinforcing rib 13 along the axial direction of the shell 1 is equal to the length of the main body portion 14.

[0063] It can be understood that the first reinforcing rib 13 is connected to the main body portion 14, and the axial length of the first reinforcing rib 13 is equal to the axial length of the main body portion 14, which means that one end of the first reinforcing rib 13 is flush with one end of the main body portion 14, and the other end of the first reinforcing rib 13 extends along the axial direction of the main body portion 14 and is flush with the other end of the main body portion 14, so that the structural strengthening effect of the first reinforcing rib 13 can be obtained along the axial length of the main body portion 14, ensuring the structural strengthening effect of the main body portion 14, so that the main body portion 14 can effectively resist the bulging force of the battery cell body 2 without bulging deformation.

[0064] In some embodiments, the distance between the end of the end of the main body portion 14 away from the sealing portion 15 and the first reinforcing rib 13 along the axial direction of the shell 1 is between 6mm and 10mm.

[0065] It can be understood that if the distance between the end of the one end of the sealing portion 15 away from the main body portion 14 and the first reinforcing rib 13 is less than 6 mm, the shell 1 may need to bend the first reinforcing rib 13 when sealing, which makes it difficult for the shell 1 to seal. If the distance between the end of the one end of the sealing portion 15 away from the main body portion 14 and the first reinforcing rib 13 is greater than 10 mm, after the shell 1 is sealed, there will still be part of the side wall of the shell 1 without the first reinforcing rib 13, which is easy to cause the structural strength of the side wall of the shell 1 to be insufficient. Therefore, the distance between the end of the one end of the sealing portion 15 away from the main body portion 14 and the first reinforcing rib 13 is set to be between 6 mm and 10 mm in the present application, which ensures that the shell 1 can be smoothly sealed while ensuring the structural strength of the side wall of the shell 1.

[0066] For example, the distance between the end of the one end of the sealing portion 15 away from the main body portion 14 and the first reinforcing rib 13 is 8 mm.

[0067] In some embodiments, the length of the first reinforcing rib 13 along the axial direction of the shell 1 is greater than or equal to the length of the battery core body 2.

[0068] It can be understood that the length of the side wall 12 connected with the first reinforcing rib 13 will be greater than or equal to the length of the battery core body 2, and the first reinforcing rib 13 can effectively enhance the structural strength of the side wall 12.

[0069] In some embodiments, the thickness of the first reinforcing rib 13 along the radial direction of the shell 1 is less than half of the thickness of the side wall 12.

[0070] It can be understood that if the thickness of the first reinforcing rib 13 is greater than half of the thickness of the side wall 12, the thickness of the first reinforcing rib 13 may be relatively large, which will affect the diameter of the battery core. Therefore, the thickness of the first reinforcing rib 13 is set to be less than half of the thickness of the side wall 12 in the present application, which can avoid causing the diameter of the battery core to be too large while enhancing the structural strength of the side wall 12.

[0071] In some embodiments, the central angle corresponding to the first reinforcing rib 13 along the circumferential direction of the shell 1 is between 5° and 45°.

[0072] It can be understood that if the central angle corresponding to the first reinforcing rib 13 is less than 5°, the first reinforcing rib 13 may not be able to effectively strengthen the structure of the side wall 12. If the central angle corresponding to the first reinforcing rib 13 is greater than 45°, it is not conducive to the formation of the first reinforcing rib 13, which increases the difficulty of manufacturing the shell 1. Therefore, the central angle corresponding to the first reinforcing rib 13 is set to be between 5° and 45° in the present application, which ensures that the first reinforcing rib 13 can effectively improve the structural strength of the side wall 12 without increasing the difficulty of manufacturing the shell 1.

[0073] For example, the central angle corresponding to the first reinforcing rib 13 is 25°.

[0074] In some embodiments, along the radial direction of the shell 1, the first reinforcing rib 13 is in a first projection of the orthographic projection of the side wall 12, and the cell body 2 is in a second projection of the orthographic projection of the side wall 12, one end of the first projection is flush with one end of the second projection, and the other end of the first projection protrudes from the other end of the second projection.

[0075] It can be understood that the first reinforcing rib 13 protrudes from the cell body 2, that is, the axial length of the side wall 12 provided with the first reinforcing rib 13 is greater than the length of the cell body 2, and at the corresponding position of the cell body 2, the side wall 12 is connected with the first reinforcing rib 13. In turn, the structural strength of the side wall 12 can be effectively improved, and the side wall 12 subjected to the expansion force of the cell body 2 is provided with the first reinforcing rib 13 to improve the structural strength, which can effectively avoid the protrusion of the side wall 12.

[0076] According to the embodiments of the second aspect of the present application, the battery comprises the above-mentioned cell.

[0077] According to the battery of the embodiments of the present application, the second reinforcing rib 16 is formed on the inner bottom wall of the shell 1, which can effectively improve the structural strength of the inner bottom wall of the shell 1, effectively prevent the inner bottom wall of the shell 1 from protruding outward when the cell body 2 expands, avoid the increase of the height of the cell, ensure the quality of the cell, and ensure the pass rate of the cell. At the same time, the at least two second reinforcing ribs 16 are uniformly arranged along the neutral point of the inner bottom wall, and the uniformity of the arrangement of the second reinforcing rib 16 ensures the uniformity of the strengthening of the structural strength of the inner bottom wall of the shell 1, which is conducive to improving the overall strength of the inner bottom wall of the shell 1, avoiding the case that part of the inner bottom wall has low strength, and improving the quality of the battery.

[0078] According to the embodiments of the third aspect of the present application, the electrical equipment comprises the above-mentioned battery.

[0079] According to the electrical equipment of the embodiments of the present application, the second reinforcing rib 16 is formed on the inner bottom wall of the shell 1, which can effectively improve the structural strength of the inner bottom wall of the shell 1, effectively prevent the inner bottom wall of the shell 1 from protruding outward when the cell body 2 expands, avoid the increase of the height of the cell, ensure the quality of the cell, and ensure the pass rate of the cell. At the same time, the at least two second reinforcing ribs 16 are uniformly arranged along the neutral point of the inner bottom wall, and the uniformity of the arrangement of the second reinforcing rib 16 ensures the uniformity of the strengthening of the structural strength of the inner bottom wall of the shell 1, which is conducive to improving the overall strength of the inner bottom wall of the shell 1, avoiding the case that part of the inner bottom wall has low strength, and improving the stability of the electrical equipment.

[0080] It should be noted that the electric device can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the electric device and does not specially limit the electric device.

[0081] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An electric cell, characterized by, The battery cell comprises: a shell formed with a mounting cavity; a cell body mounted in the mounting cavity; wherein an inner bottom wall of the shell is formed with at least two second reinforcing ribs, and the at least two second reinforcing ribs are uniformly arranged along a circumferential direction of a center point of the inner bottom wall of the shell.

2. The electric cell of claim 1, wherein, The second reinforcing ribs are arranged in a spaced manner from an edge of the bottom wall of the shell.

3. The electric cell of claim 1, wherein, In an axial direction of the shell, a projection of the second reinforcing rib on the bottom wall of the shell is located within a projection of the cell body on the bottom wall of the shell.

4. The electric cell of claim 1, wherein, The second reinforcing rib is an arc-shaped reinforcing rib, and a gap is arranged between adjacent two arc-shaped reinforcing ribs, and a width of the gap is constant along a radial direction of the shell.

5. The electric cell of claim 4, wherein, An inner diameter of the second reinforcing rib is greater than 6 mm.

6. The battery cell of any one of claims 1 to 5, wherein, An outer diameter of the second reinforcing rib is L1, and a diameter of the cell body is L2, wherein L1 < L2-2 mm.

7. The cell of any one of claims 1 to 5, wherein, In the axial direction of the shell, a height of the second reinforcing rib is less than 0.08 mm.

8. The cell of any one of claims 1 to 5, wherein, The battery cell further comprises a negative electrode bus bar formed with a boss connected with the bottom wall of the shell, and a height of the second reinforcing rib is less than a height of the boss along the axial direction of the shell.

9. The electric cell of claim 8, wherein, The at least two second reinforcing ribs are arranged around the boss, and the second reinforcing ribs are arranged in a spaced manner from the boss.

10. A battery, characterized by The battery comprises the battery cell according to any one of claims 1 to 9.

11. An electrical device, characterized by The battery comprises the battery cell according to claim 10.

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