Cover plate assembly, battery, and battery module

Abstract

A cover plate assembly, a battery, and a battery module. The cover plate assembly comprises a terminal, a cover plate, and a busbar disc. The busbar disc comprises a top wall and a bottom wall. The top wall comprises a first portion and a second portion connected to each other. The bottom wall comprises a third portion and a fourth portion connected to each other. The third portion and a battery cell are spaced apart. The first portion is connected to the cover plate.

Description

Cover assembly, battery and battery module

[0001] This application claims priority to Chinese Patent Application No. 202423287657.9, filed with the China National Intellectual Property Administration on December 30, 2024, entitled "Cover Assembly, Battery and Battery Module", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, such as a cover plate assembly, a battery, and a battery module. Background Technology

[0003] The main function of a battery busbar is to collect the current from individual battery cells and send it to the output of the battery pack, ensuring that the battery pack can stably transmit current during charging and discharging. In related technologies, in order to reduce the weight of the busbar or increase the battery capacity, the components of the cover plate are usually simplified, allowing the busbar to be directly connected to the cover plate. However, the busbar structure is relatively thin, making it prone to breakage or damage during the connection process. Summary of the Invention

[0004] This application provides a cover assembly, a battery, and a battery module, which can improve the situation of breakage or damage during the connection between the busbar and the cover.

[0005] In one aspect, this application provides a cover plate assembly.

[0006] Cover plate;

[0007] Terminals are located on one side of the cover plate and are connected to the cover plate;

[0008] A busbar is located on the side of the cover plate away from the terminals. The busbar includes a top wall facing the cover plate and a bottom wall facing the battery cell.

[0009] The top wall includes a first part and a second part that are connected to each other. The first part is connected to the cover plate, and the second part is spaced apart from the cover plate.

[0010] The bottom wall includes a third part and a fourth part that are connected to each other. The third part is positioned opposite to the first part, the fourth part is positioned opposite to the second part, the third part is spaced apart from the battery cell, and the fourth part is connected to the battery cell.

[0011] Secondly, this application provides a battery including a cell, a housing, and a cover assembly as described above, wherein the housing is configured to accommodate the cell, and the cover assembly is connected to the cell and the housing respectively.

[0012] Thirdly, this application provides a battery module. The battery module includes multiple batteries.

[0013] The beneficial effects of this application are:

[0014] This application provides a cover plate assembly, which includes terminals, a cover plate, and a busbar. The busbar includes a top wall and a bottom wall. The top wall includes a first part and a second part that are connected to each other. The first part is connected to the cover plate, and the second part is spaced apart from the cover plate. The bottom wall includes a third part and a fourth part that are connected to each other. The third part is opposite to the first part, and the fourth part is opposite to the second part. The third part is spaced apart from the battery cell, and the fourth part is connected to the battery cell. Because the third part is spaced apart from the battery cell, when the first part is connected to the cover plate, it can prevent the battery cell from being damaged by soldering through the busbar during the connection operation, thereby improving the safety of the busbar. Attached Figure Description

[0015] Figure 1 is an exploded view of the cover plate assembly provided in a specific embodiment of this application.

[0016] Figure 2 is a schematic diagram of the structure of the busbar shown in Figure 1.

[0017] Figure 3 is a top view of the manifold shown in Figure 2.

[0018] Figure 4 is a cross-sectional view of the manifold shown in Figure 2.

[0019] Figure 5 is a cross-sectional view of the cover plate assembly shown in Figure 1.

[0020] Figure 6 is a second cross-sectional view of the cover plate assembly shown in Figure 1.

[0021] Figure 7 is an enlarged schematic diagram of part A of the cover plate assembly shown in Figure 6.

[0022] Figure 8 is a schematic diagram of the battery structure provided in a specific embodiment of this application.

[0023] Figure label:

[0024] 100. Cover plate assembly;

[0025] 10. Cover plate; 11. Plate body; 12. First connecting part; 13. Welding groove; 14. Fusion welding zone;

[0026] 20. Terminal; 21. Body; 22. Second connecting part;

[0027] 30. Manifold; 301. Top wall; 302. Bottom wall; 3011. First part; 3012. Second part; 3013. Third part; 3014. Fourth part; 31. First plate; 32. Second plate; 33. Center part; 330. First injection hole;

[0028] 40. Sealing ring;

[0029] 200, battery; 2001, casing. Embodiments of the present invention

[0030] In related technologies, in order to reduce the weight of the busbar or increase the battery capacity, the components of the cover plate are usually simplified so that the busbar can be directly connected to the cover plate. However, the busbar structure is relatively thin and is prone to breakage or damage during the connection process.

[0031] Please refer to Figures 1-3. Figure 1 is an exploded view of the cover plate assembly 100 provided in an embodiment of this application. Figure 2 is a structural schematic diagram of the busbar 30 shown in Figure 1. Figure 3 is a top view of the busbar 30 shown in Figure 2. This application provides a cover plate assembly 100, which is configured to connect with a battery cell. The cover plate assembly 100 includes a cover plate 10, a terminal 20, and a busbar 30. The terminal 20 is located on one side of the cover plate 10 and connected to the cover plate 10. The busbar 30 is located on the side of the cover plate 10 away from the terminal 20. The busbar 30 includes a top wall 301 facing the cover plate 10 and a bottom wall 302 facing the battery cell. The top wall 301 includes a first part 3011 and a second part 3012 that are connected to each other. The first part 3011 is connected to the cover plate 10, and the second part 3012 is spaced apart from the cover plate 10. The bottom wall 302 includes a third part 3013 and a fourth part 3014 that are connected to each other. The third part 3013 is opposite to the first part 3011, and the fourth part 3014 is opposite to the second part 3012. The third part 3013 is spaced apart from the battery cell, and the fourth part 3014 is connected to the battery cell.

[0032] Compared to related technologies, in this application, the first part 3011 of the top wall 301 of the busbar 30 is connected to the cover plate 10, the second part 3012 is spaced apart from the cover plate 10, and the bottom wall 302 includes a third part 3013 and a fourth part 3014 that are connected to each other. The third part 3013 is arranged opposite to the first part 3011, the fourth part 3014 is arranged opposite to the second part 3012, the third part 3013 is spaced apart from the battery cell, and the fourth part 3014 is connected to the battery cell. Because the third part 3013 is spaced apart from the battery cell, when the first part 3011 is connected to the cover plate 10, the damage to the battery cell caused by soldering through the busbar 30 during the connection operation can be avoided, thereby improving the safety of the busbar 30 in use.

[0033] In some embodiments, the manifold 30 includes a central portion 33, a first plate 31, and a second plate 32. The central portion 33 has a first injection hole 330, and the area around the first injection hole 330 of the central portion 33 can be conveniently used to place a positioning fixture for injection. The first plate 31 and the second plate 32 are arranged sequentially around the first injection hole 330. The first portion 3011 includes the surface of the first plate 31 facing the terminal 20, the second portion 3012 includes the surface of the second plate 32 facing the terminal 20, the third portion 3013 includes the surface of the first plate 31 facing the battery cell, and the fourth portion 3014 includes the surface of the second plate 32 facing the battery cell.

[0034] Since the first plate 31 and the second plate 32 are arranged sequentially around the central portion 33, the first part 3011 and the third part 3013 are located on the first plate 31, and the second part 3012 and the fourth part 3014 are located on the second plate 32. This arrangement of the first part 3011 and the second part 3012 around the central portion 33 increases the welding area between the first part 3011 and the cover plate 10, and the third part 3013 and the fourth part 3014 around the central portion 33 increases the connection area between the fourth part 3014 and the battery cell.

[0035] For example, the height of the busbar 30 is not less than the height of the first plate 31 plus the height of the second plate 32. The first plate 31 and the second plate 32 form a stepped structure. The first plate 31 is connected to the cover plate 10, and the second plate 32 is connected to the battery cell. The first plate 31 and the second plate 32 can be an integrally formed structure.

[0036] In some embodiments, the busbar 30 is an annular busbar 30, which includes a plurality of first plates 31 and a plurality of second plates 32. Each first plate 31 and each second plate 32 is a fan-shaped structure. The annular structure and the fan-shaped structure can increase the busbar area and improve the busbar capacity.

[0037] In some examples, the central angle α corresponding to the first plate 31 is between 70° and 90°, such as any one of the angles 70°, 75°, 80°, 85° and 90°, and the central angle β corresponding to the second plate 32 is between 30° and 50°, such as any one of the angles 30°, 35°, 40°, 45° and 50°. The embodiments of this application do not limit this.

[0038] Please refer to Figure 4, which is a cross-sectional view of the manifold 30 shown in Figure 2. In some examples, the diameter of the manifold 30 is R1, the diameter of the central portion 33 is R2, and the diameter of the injection hole is R3, where R2 is approximately 0.4R1 and R3 is approximately 0.2R1. For example, the diameter of the manifold 30 can be any of the lengths of 0.8mm, 0.9mm, 1mm, and 1.1mm; the diameter of the central portion 33 can be any of the lengths of 0.32mm, 0.36mm, 0.4mm, and 0.44mm; and the diameter of the injection hole can be any of the lengths of 0.16mm, 0.18mm, 0.2mm, and 0.22mm.

[0039] In some examples, the manifold 30 is manufactured using a stamping process, which involves shaping a sheet metal into the desired form using a punch, die, and pressure. Stamping is a very fast and precise production method, suitable for mass production. Stamping ensures a smooth and flat surface on the parts, and typically requires no additional surface treatment.

[0040] In some embodiments, the distance between the first portion 3011 and the battery cell is a first distance, the distance between the second portion 3012 and the cover plate 10 is a second distance, and the first distance is greater than the second distance. The distance between the third portion 3013 and the cover plate 10 is a third distance, and the distance between the fourth portion 3014 and the cover plate 10 is a fourth distance, and the fourth distance is greater than the third distance. That is, the first plate 31 and the second plate 32 are staggered to form a concave-convex structure. Compared with increasing the thickness of the first plate 31 to connect the first plate 31 and the cover plate 10, the concave-convex structure can increase the height of the busbar 30 without increasing the thickness of the busbar 30, thereby reducing manufacturing costs.

[0041] Please refer to Figures 5-7. Figure 5 is a first cross-sectional view of the cover assembly 100 shown in Figure 1, Figure 6 is a second cross-sectional view of the cover assembly 100 shown in Figure 1, and Figure 7 is an enlarged schematic diagram of part A of the cover assembly 100 shown in Figure 6. In Figure 7, the first connecting part 12 is bent and connected to the second connecting part 22.

[0042] In some embodiments, the first plate 31 and the second plate 32 have the same thickness, and the first plate 31 and the second plate 32 are bent and connected around the first injection hole 330. The thickness of the first plate 31 and / or the second plate 32 is between 0.3 mm and 0.5 mm.

[0043] In some examples, the thickness of the first plate 31 can be any one of 0.3mm, 0.4mm, 0.5mm, and 0.6mm, and the thickness of the second plate 32 can be any one of 0.3mm, 0.4mm, 0.5mm, and 0.6mm. The thicknesses of the first plate 31 and the second plate 32 can be equal or unequal.

[0044] In some embodiments, the first plate 31 is welded to the cover plate 10. The cover plate 10 has a welding groove 13 on the side opposite to the first plate 31. The welding groove 13 is a structure for accommodating the terminal 20 before welding. The cover plate 10 and the first plate 31 form a fusion welding zone 14, which refers to the area where the fusion weld penetrates the cover plate 10 and the first plate 31 during the welding process. The thickness of the cover plate 10 is H1, the depth of the welding groove 13 is H2, the distance from the bottom of the welding groove 13 to the side of the first plate 31 opposite to the cover plate 10 is H3, and the depth of the fusion welding zone 14 is H4. Wherein, H2 is between 0.5 and 0.6H1, and H4 is between 0.7 and 0.9H3.

[0045] In some examples, the thickness H1 of the cover plate 10 is between 1.3mm and 1.7mm, such as any one of 1.3mm, 1.4mm, 1.5mm and 1.6mm; H2 is between 0.65mm and 1.02mm, such as any one of 0.65mm, 0.78mm, 0.8mm, 0.96mm and 1.02mm; H3 is between 1mm and 1.3mm, such as any one of 1mm, 1.1mm, 1.2mm and 1.3mm; H4 is between 0.7mm and 1.17mm, such as any one of 0.7mm, 0.77mm, 0.84mm, 0.91mm, 1.08mm and 1.17mm. This application does not limit the specific values.

[0046] In some examples, the height H5 of the first connecting portion 12 is approximately 0.2 mm less than the depth H2 of the welding groove 13, and the distance H6 between the top of the first connecting portion 12 and the top of the second connecting portion 22 is 0.5H5. The height H5 of the first connecting portion 12 can be any one of 0.45 mm, 0.58 mm, 0.6 mm, 0.76 mm, and 0.82 mm, and the distance H6 between the top of the first connecting portion 12 and the top of the second connecting portion 22 can be any one of 0.23 mm, 0.29 mm, 0.3 mm, 0.38 mm, and 0.41 mm. This ensures that the first connecting portion 12 can be completely placed within the welding groove 13, and that the first connecting portion 12 has sufficient height to hold and fix the second connecting portion 22 after riveting and bending, thereby improving the stability of the cover plate 10 structure.

[0047] In some examples, the width D1 of the weld groove 13 is between 3mm and 5mm, such as any one of 3mm, 4mm, and 5mm. The width D2 of the first connector is between approximately 0.2mm and 0.3mm, such as any one of 0.2mm, 0.25mm, and 0.3mm, and the width D3 of the fusion weld zone 14 is approximately 0.8D1, such as any one of 2.4mm, 3.2mm, and 4mm.

[0048] In some embodiments, the cover plate 10 includes a plate body 11 and a first connecting portion 12 protruding from the plate body 11 on the side away from the manifold 30. The cover plate 10 has a second injection hole at its center, and the second injection hole and the first injection hole 330 are correspondingly arranged. The terminal 20 covers the second injection hole. The terminal 20 includes a body 21 and a second connecting portion 22 protruding from the body 21. The first connecting portion 12 is mounted on the second connecting portion 22 and is configured to limit the displacement of the second connecting portion 22.

[0049] In some embodiments, the second connecting portion 22 is arranged around the body 21, and the first connecting portion 12 is arranged around the second connecting portion 22. The second connecting portion 22 includes a top surface and a side surface surrounding the top surface. The first connecting portion 12 includes a first segment and a second segment that are bent and connected. The first segment is connected to the side surface and the second segment is connected to the top surface.

[0050] In some examples, structural adhesive can be applied between the second segment and the top surface. The structural adhesive can cover the second segment to reduce friction between the first connecting portion 12 and the second connecting portion 22.

[0051] In some embodiments, the first connecting portion 12 is riveted to the second connecting portion 22, such as by spin riveting, which provides a strong mechanical connection force. The first connecting portion 12 and the second connecting portion 22 after spin riveting have high tensile strength and shear strength.

[0052] In some embodiments, the first connecting portion 12 is an annular rib, and the second connecting portion 22 is an annular flange, with the annular flange located inside the annular rib. By providing the annular rib and the annular flange, the annular rib is riveted and then pressed and fixed to the annular flange, thereby achieving the assembly and fixing of the terminal 20. This further simplifies the number of parts and assembly process of the cover plate 10 structure, reduces assembly difficulty, and improves production efficiency.

[0053] In some embodiments, a groove is provided on the side of the terminal 20 facing the cover plate 10, and the cover plate 10 structure further includes a sealing ring 40, which is disposed in the groove and sandwiched between the terminal 20 and the cover plate 10, and the sealing ring 40 is disposed around the second injection hole.

[0054] For example, the sealing ring 40 can limit the horizontal and vertical movement of the terminal 20. The sealing ring 40 surrounds the inner wall of the terminal 20 and is located at the end of the second connecting portion 22 away from the first connecting portion 12 to limit the horizontal displacement of the terminal 20. The top of the sealing ring 40 abuts against the terminal 20, and the bottom of the sealing ring 40 abuts against the cover plate 10 to limit the vertical displacement of the terminal 20, ultimately ensuring the stable placement of the sealing ring 40 so as to perform the corresponding sealing function. Since the sealing ring 40 is generally made of elastic insulating materials such as rubber, the sealing ring 40 will expand and deform when compressed. The compression ratio of the sealing ring 40 is between 0.25 and 0.35. The compression amount of the sealing ring 40 mentioned above refers to the ratio of the thickness of the sealing ring 40 to the initial thickness of the sealing ring 40 after it is fixed between the terminal 20 and the cover plate 10 by the first connecting part 12 and the second connecting part 22. The ratio can be any one of 0.25, 0.27, 0.3, 0.32 and 0.35.

[0055] This application also provides a battery. Please refer to FIG8, which is a structural schematic diagram of the battery 200 provided in an embodiment of this application. The battery 200 includes a cell, a housing 2001, and a cover assembly 100 as described above. The housing 2001 is configured to accommodate the cell, and the cover assembly 100 is connected to the cell and the housing 2001 respectively.

[0056] For example, the battery 200 can be any one of lithium-ion battery, sodium-ion battery, nickel-metal hydride battery, lead-acid battery and polymer battery, and the shape of the battery 200 can be any one of rectangular, cylindrical and square.

[0057] This application also provides a battery module, which includes the battery 200 as described above.

[0058] For example, a battery module is a component composed of multiple batteries 200, configured to enhance energy storage and provide power. The battery module can be a single-layer module, or a double-layer or multi-layer module.

Claims

1. A cover plate assembly, the cover plate assembly being configured to connect to a battery cell, wherein, include: Cover plate; A terminal is provided on one side of the cover plate and connected to the cover plate; A busbar is disposed on the side of the cover plate away from the terminal. The busbar includes a top wall facing the cover plate and a bottom wall facing the battery cell. The top wall includes a first part and a second part that are connected to each other. The first part is connected to the cover plate, and the second part and the cover plate are spaced apart. The bottom wall includes a third part and a fourth part that are connected to each other. The third part is disposed opposite to the first part, the fourth part is disposed opposite to the second part, the third part is spaced apart from the battery cell, and the fourth part is connected to the battery cell.

2. The cover plate assembly according to claim 1, wherein, The manifold includes a central portion, a first plate, and a second plate. The central portion has a first injection hole, and the first plate and the second plate are arranged sequentially around the first injection hole. The first portion includes the surface of the first plate body facing the terminal, and the second portion includes the surface of the second plate body facing the terminal. The third part includes the surface of the first plate facing the cell, and the fourth part includes the surface of the second plate facing the cell.

3. The cover plate assembly according to claim 2, wherein, The busbar is a ring-shaped busbar, which includes multiple first plates and multiple second plates, each of which is a fan-shaped structure.

4. The cover plate assembly according to claim 3, wherein, The central angle corresponding to the first plate is between 70° and 90°, and the central angle corresponding to the second plate is between 30° and 50°.

5. The cover plate assembly according to claim 2, wherein, The distance between the first part and the battery cell is a first distance, and the distance between the second part and the cover plate is a second distance, wherein the first distance is greater than the second distance; The distance between the third part and the cover plate is the third distance, and the distance between the fourth part and the cover plate is the fourth distance, which is greater than the third distance.

6. The cover plate assembly according to claim 2, wherein, The first plate and the second plate have the same thickness, and the first plate and the second plate are bent and connected around the first injection hole.

7. The cover plate assembly according to claim 2, wherein, The thickness of the first plate and / or the second plate is between 0.3 mm and 0.5 mm.

8. The cover plate assembly according to claim 2, wherein, The first plate is welded to the cover plate. The cover plate has a welding groove on the side away from the first plate. The cover plate and the first plate form a fusion welding zone. The thickness of the cover plate is H1. The depth of the welding groove is H2. The distance from the bottom of the welding groove to the side of the first plate away from the cover plate is H3. The depth of the fusion welding zone is H4. H2 is between 0.5H1 and 0.6H1, and H4 is between 0.7H3 and 0.9H3.

9. The cover plate assembly according to any one of claims 1-8, wherein, The cover plate includes a plate body and a first connecting portion protruding from the plate body on the side away from the manifold, and the center of the cover plate is provided with a second liquid injection hole; The terminal is covered by the second injection hole. The terminal includes a body and a second connecting portion protruding from the body. The first connecting portion is installed on the second connecting portion and is configured to limit the displacement of the second connecting portion.

10. The cover plate assembly according to claim 9, wherein, The second connecting portion is arranged around the body, and the first connecting portion is arranged around the second connecting portion. The second connecting portion includes a top surface and a side surface surrounding the top surface. The first connecting portion includes a first segment and a second segment that are bent and connected. The first segment is connected to the side surface, and the second segment is connected to the top surface.

11. The cover plate assembly according to claim 10, wherein, The terminal has a groove on the side facing the cover plate; The cover plate assembly also includes a sealing ring, which is disposed in the groove and sandwiched between the terminal and the cover plate, and the sealing ring is arranged around the second injection hole.

12. A battery comprising a cell, a housing, and a cover assembly as claimed in any one of claims 1-11, wherein the housing is configured to receive the cell, and the cover assembly is connected to the cell and the housing, respectively.

13. A battery module comprising a plurality of batteries as described in claim 12.

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