Cover plate structure and battery cell

Abstract

The utility model relates to energy storage equipment technical field especially relates to a cover plate structure and electric core, cover plate structure includes top cap and pole assembly. Top cap has N first through -hole, N is the positive integer greater than 1. Pole assembly includes first pole and second pole, and first pole has connecting part and N cylinder part, and N cylinder part all are connected with connecting part, and connecting part sets up at the one side of top cap towards electric core outside, and N cylinder part one -to -one corresponding wear in N first through -hole, and second pole sets up at the one side of top cap towards electric core inside, and N cylinder part all are connected with second pole. Electric core includes shell and above -mentioned cover plate structure, and cover plate structure covers and sets in the opening place of shell. The cover plate structure and electric core can help to improve the blade electric core over -current capacity while helping to reduce assembly steps, reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a cover plate structure and a battery cell. Background Technology

[0002] The cover structure of a battery cell includes terminals. To improve the current-carrying capacity of the cover structure, the diameter of the terminals needs to be increased. However, for blade batteries, the top cover of the cover structure is long and narrow, and the increase in the terminal diameter is limited by the width of the top cover. Therefore, the cover structure of a blade battery cell has more than one terminal. Increasing the number of terminals and distributing their positions reasonably can improve the current-carrying capacity of the cover structure. However, setting multiple individual terminals increases assembly steps and processing costs. Utility Model Content

[0003] One objective of this invention is to provide a cover plate structure that can help improve the current carrying capacity of the blade battery cell while reducing assembly steps and lowering costs.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A cover plate structure is provided, comprising:

[0006] The top cover has N first through holes, where N is a positive integer greater than 1;

[0007] The electrode assembly includes a first electrode and a second electrode. The first electrode has a connecting portion and N column portions. All N column portions are connected to the connecting portion. The connecting portion is located on the side of the top cover facing the outside of the battery cell. The N column portions are correspondingly inserted through N first through holes. The second electrode is located on the side of the top cover facing the inside of the battery cell. All N column portions are connected to the second electrode.

[0008] Optionally, all N cylindrical portions are welded to the second pole post.

[0009] Optionally, the end face of the second electrode post facing the inside of the cell is provided with N receiving grooves, and the bottom of each receiving groove is provided with a second through hole. The N column parts are respectively inserted through the N second through holes, and the end face of the column part facing the inside of the cell is flush with the bottom of the receiving groove.

[0010] Optionally, the end face of the column portion facing the inside of the cell is welded to the bottom of the receiving groove, the weld penetration depth is e, and the thickness of the bottom of the receiving groove along the axial direction of the column portion is f, satisfying: 0.3mm≤e≤0.8f;

[0011] And / or, along the axial direction of the column portion, the groove depth b of the receiving groove satisfies: 0.2mm≤b≤0.5mm;

[0012] And / or, the receiving groove is coaxially arranged with the column part, the bottom of the receiving groove is an annular structure, and the width a of the annular structure along the radial direction of the column part satisfies: 0.5mm≤a≤1.5mm.

[0013] Optionally, it also includes N sealing rings, each of which is fitted onto one of the N column portions, with the end face of the sealing ring facing the inside of the cell abutting against the end face of the second electrode facing the outside of the cell.

[0014] Optionally, the sealing ring is coaxially arranged with the first through hole, and the end face of the sealing ring facing the outside of the battery cell has a first annular area. The first annular area abuts against the end face of the top cover facing the inside of the battery cell. Before the sealing ring is compressed, the width d of the first annular area along the radial direction of the sealing ring satisfies: 0.5mm≤d≤1mm.

[0015] Optionally, each of the column portions has a stepped surface circumferentially circumferentially oriented toward the inside of the battery cell. The stepped surface abuts against the end face of the sealing ring facing the outside of the battery cell. Along the radial direction of the column portion, the width c of the stepped surface satisfies: 0.3mm≤c≤0.8mm.

[0016] Optionally, it also includes a first insulating member, which is partially sandwiched between the connecting portion and the top cover. The first insulating member has N third through holes, and the N column portions are correspondingly inserted into the N third through holes.

[0017] Optionally, the first insulating member has N protruding tubular portions, which protrude toward the inside of the battery cell. Each of the N protruding tubular portions is connected to one of the N third through holes. Each of the N protruding tubular portions is sleeved on one of the N columnar portions, and each of the N protruding tubular portions is inserted into one of the N first through holes.

[0018] Another objective of this invention is to provide a battery cell that can help improve the overcurrent capacity of blade batteries while reducing assembly steps and lowering costs.

[0019] To achieve this objective, the present invention adopts the following technical solution:

[0020] A battery cell is provided, including a housing and the aforementioned cover structure, the cover structure covering an opening in the housing.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a cover structure, including a top cover and a terminal assembly. The top cover has N first through holes, where N is a positive integer greater than 1. The terminal assembly includes a first terminal and a second terminal. The first terminal has a connecting part and N cylindrical parts, all of which are connected to the connecting part. The connecting part is located on the side of the top cover facing the outside of the battery cell. The N cylindrical parts are correspondingly inserted through the N first through holes. The second terminal is located on the side of the top cover facing the inside of the battery cell, and all N cylindrical parts are connected to the second terminal. By using N cylindrical parts, the current carrying capacity of the blade battery cell can be improved. Connecting the N cylindrical parts to the same connecting part allows for the one-step removal and assembly of multiple cylindrical parts onto the top cover, followed by connecting the N cylindrical parts to the second terminal. This significantly reduces assembly steps, improves assembly efficiency, and lowers costs. Furthermore, the connecting part is located on the outside of the top cover, and the second pole is located inside the top cover. The pole body is connected to the second pole, which allows the pole assembly to be firmly installed on the top cover. No additional rivet blocks or other components are needed, which can further reduce assembly steps and lower costs.

[0023] This utility model also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure covering the opening of the housing. This battery cell can help improve the current carrying capacity of blade batteries while reducing assembly steps and lowering costs. Attached Figure Description

[0024] Figure 1 This is a first-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model;

[0025] Figure 2 This is a second-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model;

[0026] Figure 3 This is an exploded view of the cover plate structure provided in an embodiment of the present utility model from a third perspective;

[0027] Figure 4 This is an exploded view of the cover plate structure provided in an embodiment of the present utility model from a fourth perspective;

[0028] Figure 5 This is a cross-sectional view of the cover plate structure provided in this embodiment of the utility model;

[0029] Figure 6 This is a partially enlarged cross-sectional view of the cover plate structure provided in this embodiment of the utility model.

[0030] In the picture:

[0031] 1. Top cover; 11. First through hole;

[0032] 2. First pole post; 21. Connecting part; 22. Column part; 221. Stepped surface;

[0033] 3. Second pole post; 31. Receiving groove; 32. Second through hole;

[0034] 4. Sealing ring; 41. First annular region;

[0035] 5. First insulating element; 51. Third through hole; 52. Protruding tubular part;

[0036] 6. Second insulating component; 61. Fourth through hole. Detailed Implementation

[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The cover structure of a battery cell includes terminals. To improve the current-carrying capacity of the cover structure, the diameter of the terminals needs to be increased. However, for blade batteries, the top cover of the cover structure is long and narrow, and the increase in the terminal diameter is limited by the width of the top cover. Therefore, the cover structure of a blade battery cell has more than one terminal. Increasing the number of terminals and distributing their positions reasonably can improve the current-carrying capacity of the cover structure. However, setting multiple individual terminals increases assembly steps and processing costs.

[0041] This embodiment provides a cover plate structure to solve the above problems. The cover plate structure can help improve the overcurrent capacity of the blade cell while reducing assembly steps and lowering costs.

[0042] like Figures 1-6 As shown, the cover structure of this embodiment includes a top cover 1 and an electrode assembly. The top cover 1 has N first through holes 11, where N is a positive integer greater than 1. The electrode assembly includes a first electrode 2 and a second electrode 3. The first electrode 2 has a connecting portion 21 and N columnar portions 22, all of which are connected to the connecting portion 21. The connecting portion 21 is located on the side of the top cover 1 facing the outside of the battery cell. The N columnar portions 22 are correspondingly inserted through the N first through holes 11. The second electrode 3 is located on the side of the top cover 1 facing the inside of the battery cell, and all N columnar portions 22 are connected to the second electrode 3.

[0043] By setting N pillar sections 22, the current carrying capacity of the blade battery cell can be improved. Connecting the N pillar sections 22 to the same connecting part 21 allows for the one-step removal and assembly of multiple pillar sections 22 onto the top cover 1. Then, the N pillar sections 22 are connected to the second electrode post 3. This significantly reduces assembly steps, improves assembly efficiency, and lowers costs. Furthermore, since the connecting part 21 is located on the outside of the top cover 1 and the second electrode post 3 is located inside, connecting the pillar sections 22 to the second electrode post 3 ensures the electrode assembly is securely mounted on the top cover 1, eliminating the need for additional riveting blocks or other components, further reducing assembly steps and costs.

[0044] Optionally, N columnar portions 22 are arranged sequentially at intervals along the length of the top cover 1 to accommodate the narrow top cover 1. Optionally, in this embodiment, N is 2, that is, the first pole post 2 has two columnar portions 22. Of course, in other embodiments, N can also be 3, 4, 5, 6 or a larger positive integer. The arrangement of the multiple columnar portions 22 can also be adjusted according to the size of the top cover 1, and is not limited here.

[0045] Optionally, in this embodiment, the column part 22 is a cylindrical structure, the connecting part 21 is a rectangular plate, and the second pole post 3 is also a rectangular plate. The plate surfaces of the connecting part 21 and the second pole post 3 are parallel to the top cover 1. The shapes of the connecting part 21 and the second pole post 3 are mainly adapted to fit the narrow top cover 1 of the blade battery cell.

[0046] Optionally, all N cylindrical portions 22 are welded to the second pole post 3. Optionally, all N cylindrical portions 22 are laser-welded to the second pole post 3 to ensure a firm connection between the cylindrical portions 22 and the second pole post 3.

[0047] Optionally, the end face of the second pole post 3 facing the inside of the cell is provided with N receiving grooves 31, and the bottom of each receiving groove 31 is provided with a second through hole 32. The N pillar parts 22 are respectively inserted through the N second through holes 32. The end face of the pillar part 22 facing the inside of the cell is flush with the bottom of the receiving groove 31, which can facilitate welding operation and improve welding quality.

[0048] Optionally, the end face of the column portion 22 facing the inside of the cell is welded to the bottom of the receiving groove 31, with the weld mark located inside the receiving groove 31. The weld penetration depth is e, and the thickness of the bottom of the receiving groove 31 along the axial direction of the column portion 22 is f, satisfying: 0.3mm≤e≤0.8f. If the value of e is less than 0.3mm, the weld strength is insufficient, and the connection between the first pole 2 or the second pole 3 is easily broken when under force, and the various components of the cover plate structure will no longer be compressed, leading to the risk of displacement, which may result in the inability to conduct electricity, sealing failure, insulation failure, short circuit, etc. If the value of e is greater than 0.8 times the thickness f of the bottom of the receiving groove 31, the weld is too deep and may easily burn the sealing ring 4 fitted on the column portion 22, leading to sealing failure. The position and shape of the sealing ring 4 will be described in detail later.

[0049] Optionally, when f is 3mm, e can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, or 2.4mm.

[0050] Optionally, along the axial direction of the column portion 22, the groove depth b of the receiving groove 31 satisfies: 0.2mm ≤ b ≤ 0.5mm. Since the weld marks between the column portion 22 and the bottom of the receiving groove 31 are located within the receiving groove 31, when the groove depth b of the receiving groove 31 is less than 0.2mm, the weld marks are likely to protrude from the receiving groove 31, scratching the electrode tabs or connectors of the electrode assembly within the battery cell, and may also interfere with the welding of the second electrode post 3 to the electrode tabs or connectors of the electrode assembly. When the groove depth b of the receiving groove 31 is greater than 0.5mm, the groove depth of the receiving groove 31 is too deep. If the plate thickness of the second electrode post 3 remains unchanged, the wall thickness of the bottom of the receiving groove 31 will decrease, affecting the structural strength at this location. If the plate thickness of the second electrode post 3 also increases accordingly, it will occupy the height space within the battery cell, increasing the cost of the second electrode post 3.

[0051] Optionally, the value of b can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm.

[0052] Optionally, the receiving groove 31 is coaxially arranged with the cylindrical part 22. In this embodiment, the receiving groove 31 is also a cylindrical groove to fit the cylindrical part 22.

[0053] Optionally, the bottom of the receiving groove 31 is an annular structure. Along the radial direction of the column portion 22, the width 'a' of the annular structure is consistent throughout, and the value of 'a' satisfies: 0.5mm ≤ a ≤ 1.5mm. If 'a' is less than 0.5mm, the weld marks between the column portion 22 and the bottom of the receiving groove 31 may protrude from the receiving groove 31, and the sidewall of the receiving groove 31 may also interfere with the welding process, causing some weld marks to be located on the end face of the second pole post 3 facing the inside of the battery cell. This may not only scratch the electrode tabs or connectors of the electrode group inside the battery cell, but may also interfere with the welding of the second pole post 3 to the electrode tabs or connectors of the electrode group. If 'a' is greater than 1.5mm, the size of the receiving groove 31 is too large, which will affect the structural strength of the second pole post 3. If the cross-sectional diameter of the column portion 22 itself is also large, it may affect the spatial design of the cover plate structure along the width direction of the top cover 1.

[0054] Optionally, the value of 'a' can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm.

[0055] To ensure the sealing performance of the cover plate structure, the cover plate structure may optionally include N sealing rings 4, which are fitted one-to-one on the N column portions 22, with the end face of the sealing ring 4 facing the inside of the cell abutting against the end face of the second pole post 3 facing the outside of the cell.

[0056] Optionally, the cover structure further includes a second insulating member 6, which is attached to the side of the top cover 1 facing the inside of the battery cell, and the second insulating member 6 is partially sandwiched between the top cover 1 and the second terminal post 3. The second insulating member 6 has N fourth through holes 61, and the N post portions 22 are inserted into the N fourth through holes 61 in a one-to-one correspondence, and the sealing ring 4 is also located in the fourth through holes 61.

[0057] Optionally, the sealing ring 4 is coaxially arranged with the first through hole 11. Optionally, the sealing ring 4, the first through hole 11, the column part 22, and the fourth through hole 61 are all coaxially arranged, and the sealing ring 4 is partially sandwiched between the top cover 1 and the second pole post 3.

[0058] Optionally, the end face of the sealing ring 4 facing the outside of the battery cell has a first annular region 41, which abuts against the end face of the top cover 1 facing the inside of the battery cell. The width of the first annular region 41 is consistent circumferentially along the radial direction of the sealing ring 4. Before compression, the width d of the first annular region 41 along the radial direction of the sealing ring 4 satisfies: 0.5mm ≤ d ≤ 1mm. If d is less than 0.5mm, poor sealing is likely to occur. When there are certain processing and assembly errors in the sealing ring 4, top cover 1, and electrode assembly, there may be a risk of local sealing failure. If d is greater than 1mm, the overall size of the sealing ring 4 may be too large. Within the relatively small width of the top cover 1, the edges of the fourth through hole 61 of the second insulating component 6 will be too narrow along the width direction, resulting in insufficient structural strength.

[0059] Optionally, the value of d can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0060] Optionally, each column portion 22 has a stepped surface 221 circumferentially ...

[0061] Optionally, the width of the step surface 221 is consistent throughout the circumference. Optionally, the width c of the step surface 221 along the radial direction of the column portion 22 satisfies: 0.3mm ≤ c ≤ 0.8mm. If the value of c is less than 0.3mm, the contact area between the column portion 22 and the sealing ring 4 is too small, which can easily lead to poor sealing. If the value of c is greater than 0.8mm, when the size of the welded end of the column portion 22 remains unchanged, one end of the column portion 22 connecting to the connecting portion 21 will be too thick, occupying too much width space of the top cover 1, resulting in the portion of the top cover 1 located at the edge of the first through hole 11 along the width direction being too narrow, affecting the local structural strength of the top cover 1, and making the top cover 1 prone to deformation when welded to the shell. If the value of c is greater than 0.8mm, and when the size of one end of the column portion 22 connecting to the connecting portion 21 remains unchanged, the size of the welded end of the column portion 22 will be too small, resulting in restricted flow, reduced weld length, and weakened weld strength.

[0062] Optionally, the value of c can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm.

[0063] Optionally, the cover structure also includes a first insulating member 5, which is partially sandwiched between the connecting part 21 and the top cover 1. The first insulating member 5 has N third through holes 51, and N column parts 22 are correspondingly inserted into the N third through holes 51.

[0064] Optionally, the first insulating member 5 has N protruding tubular portions 52, which protrude toward the inside of the battery cell. The N protruding tubular portions 52 are connected to the N third through holes 51 in a one-to-one manner. The N protruding tubular portions 52 are sleeved on the N columnar portions 22 in a one-to-one manner, and the N protruding tubular portions 52 are inserted into the N first through holes 11 in a one-to-one manner. That is, the protruding tubular portions 52 are sandwiched between the inner wall of the columnar portion 22 and the first through hole 11.

[0065] It is known that the sealing ring 4 blocks the gap between the protruding tubular part 52 and the inner wall of the first through hole 11, and also blocks the gap between the protruding tubular part 52 and the columnar part.

[0066] Optionally, the first insulating member 5 also includes a side that is attached to the side wall of the connecting portion 21 to further prevent the pole assembly from short-circuiting with the top cover 1.

[0067] Optionally, in this embodiment, the cover plate structure includes only one terminal assembly, and the other terminal or terminal assembly is disposed on another surface of another battery cell. Of course, in other embodiments, the cover plate structure may also have two terminal assemblies, one positive and one negative. Alternatively, in another embodiment, the cover plate structure may have multiple terminal assemblies, all of which are positive terminals, or multiple terminal assemblies that are all negative terminals, or a combination of multiple terminal assemblies consisting of both positive and negative terminals.

[0068] This embodiment also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure covering the opening of the housing. This battery cell can help improve the current carrying capacity of the blade battery cell while reducing assembly steps and lowering costs.

[0069] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cover plate structure, characterized in that, include: The top cover (1) has N first through holes (11), where N is a positive integer greater than 1; The electrode assembly includes a first electrode (2) and a second electrode (3). The first electrode (2) has a connecting part (21) and N column parts (22). All N column parts (22) are connected to the connecting part (21). The connecting part (21) is located on the side of the top cover (1) facing the outside of the cell. The N column parts (22) are correspondingly inserted through the N first through holes (11). The second electrode (3) is located on the side of the top cover (1) facing the inside of the cell. All N column parts (22) are connected to the second electrode (3).

2. The cover plate structure according to claim 1, characterized in that, All N column sections (22) are welded to the second pole post (3).

3. The cover plate structure according to claim 2, characterized in that, The second pole post (3) has N receiving slots (31) on the end face facing the inside of the cell. Each receiving slot (31) has a second through hole (32) at the bottom. The N pillar parts (22) are inserted one by one through the N second through holes (32). The end face of the pillar part (22) facing the inside of the cell is flush with the bottom of the receiving slot (31).

4. The cover plate structure according to claim 3, characterized in that, The end face of the column part (22) facing the inside of the cell is welded to the bottom of the receiving groove (31), with a welding penetration depth of e. Along the axial direction of the column part (22), the thickness of the bottom of the receiving groove (31) is f, satisfying: 0.3mm≤e≤0.8f. And / or, along the axial direction of the column portion (22), the groove depth b of the receiving groove (31) satisfies: 0.2mm≤b≤0.5mm; And / or, the receiving groove (31) is coaxially arranged with the column part (22), the bottom of the receiving groove (31) is an annular structure, and along the radial direction of the column part (22), the width a of the annular structure satisfies: 0.5mm≤a≤1.5mm.

5. The cover plate structure according to any one of claims 1-4, characterized in that, It also includes N sealing rings (4), which are fitted one-to-one on the N column portions (22). The end face of the sealing ring (4) facing the inside of the cell abuts against the end face of the second pole post (3) facing the outside of the cell.

6. The cover plate structure according to claim 5, characterized in that, The sealing ring (4) is coaxially arranged with the first through hole (11). The end face of the sealing ring (4) facing the outside of the battery cell has a first annular area (41). The first annular area (41) abuts against the end face of the top cover (1) facing the inside of the battery cell. Before the sealing ring (4) is compressed, the width d of the first annular area (41) along the radial direction of the sealing ring (4) satisfies: 0.5mm≤d≤1mm.

7. The cover plate structure according to claim 5, characterized in that, Each of the columnar portions (22) has a stepped surface (221) circumferentially ...

8. The cover plate structure according to any one of claims 1-4, characterized in that, It also includes a first insulating member (5), which is partially sandwiched between the connecting part (21) and the top cover (1). The first insulating member (5) has N third through holes (51), and the N column parts (22) are correspondingly inserted through the N third through holes (51).

9. The cover plate structure according to claim 8, characterized in that, The first insulating member (5) has N protruding tubular portions (52), which protrude toward the inside of the battery cell. The N protruding tubular portions (52) are connected to the N third through holes (51) one by one. The N protruding tubular portions (52) are sleeved on the N column portions (22) one by one, and the N protruding tubular portions (52) are inserted into the N first through holes (11) one by one.

10. A battery cell, characterized in that, It includes a housing and a cover structure as described in any one of claims 1-9, the cover structure covering the opening of the housing.

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