Top cover assembly and battery cell
By recessing the cover plate to form an avoidance groove and adding plastic, the problem of the protruding pole occupying space is solved, thereby improving the energy density of the battery cell.
Patent Information
- Application Number
- CN202423177899.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing single-cell batteries, the height of the upper plastic between the terminal and the cover plate is higher than that of the cover plate, resulting in a high protrusion of the terminal, which occupies space in the single-cell arrangement and limits the energy density of the single-cell battery.
Design a top cover assembly, in which the cover plate is recessed to form a relief groove, the upper plastic in the mounting hole is placed in the relief groove, the pole is inserted through the mounting hole, the adapter plate connects the pole and the pole ear, the fixing ring presses the upper plastic, the sealing ring seals the gap, and the height of the upper plastic above the cover plate is reduced.
While ensuring the protrusion of the terminal post onto the plastic, the height of the protruding terminal post cover plate was reduced, freeing up space in the cell casing and increasing the energy density of the cell.
Smart Images
Figure CN223728872U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a top cap subassembly and electric core. BACKGROUND
[0002] As the representative of green traffic, the electric vehicle has the advantages of energy saving, environmental protection, cleaning compared with traditional fuel automobile, reduces the environmental protection cost, economic cost of automobile use. And the endurance problem of electric vehicle has been the key problem of restricting the rapid development of electric vehicle, in order to improve the endurance mileage of electric vehicle, it needs to use high energy density power battery.
[0003] In the existing single electric core, the upper plastic is arranged between the pole and the cover plate to separate the two. In order to facilitate the connection of external circuit, the pole needs to protrude the upper plastic by a certain height, since the upper plastic will also be higher than the cover plate, which leads to the height of the pole protruding the cover plate being higher, which occupies the overall arrangement space of the single electric core, resulting in the height of the shell of the single electric core being limited, which limits the height of the pole group assembly inside the shell, and affects the energy density of the single electric core. UTILITY MODEL CONTENT
[0004] The utility model discloses a top cap subassembly and electric core can accommodate higher pole group assembly, thereby improve the energy density of electric core.
[0005] In order to achieve this purpose, the utility model adopts the following technical scheme:
[0006] A top cap subassembly, comprising:
[0007] The cover plate is partially concave to form a clearance groove, and the clearance groove is provided with a mounting hole, and the mounting hole is provided with a pole;
[0008] The upper plastic is arranged in the clearance groove, and at least part of the upper plastic is located between the cover plate and the pole to separate the cover plate and the pole.
[0009] As an optional solution of the above-mentioned top cap subassembly, the top cap subassembly further comprises an adapter piece, one end of the adapter piece is connected with the pole, and the other end of the adapter piece is located beside the pole to connect the corresponding pole lug.
[0010] As an optional solution of the above-mentioned top cap subassembly, the adapter piece comprises a pole connecting part and a lug connecting part, and the distance between the lug connecting part and the cover plate is less than the distance between the pole connecting part and the cover plate.
[0011] As an optional solution of the top cover assembly, the adapter piece further comprises a transition connection part connecting the pole post connection part and the tab connection part, an angle between a plane where the transition connection part is located and a plane where the cover plate piece is located is α, and 0° < α ≤ 90°.
[0012] As an optional solution of the top cover assembly, the pole post comprises a post body and a connecting circular table, the post body is arranged in the mounting hole, the connecting circular table is connected to an end of the post body and is located on a side of the cover plate piece close to the tab, and the adapter piece abuts against the connecting circular table and is fixedly connected with the connecting circular table.
[0013] As an optional solution of the top cover assembly, the top cover assembly further comprises a fixing ring, the fixing ring is sleeved on the pole post and is fixedly connected with the pole post, and the fixing ring presses the upper plastic in the avoiding groove.
[0014] As an optional solution of the top cover assembly, a height of the upper plastic protruding the upper surface of the cover plate piece is less than a height of the pole post protruding the upper surface of the cover plate piece.
[0015] As an optional solution of the top cover assembly, the height of the pole post protruding the upper surface of the cover plate piece is 0.5mm-1.5mm.
[0016] As an optional solution of the top cover assembly, the top cover assembly further comprises a sealing ring, the sealing ring is sleeved on the pole post and is located between the pole post and the cover plate piece, and the sealing ring is configured to seal a gap between the pole post and the cover plate piece.
[0017] An electric core comprises the top cover assembly, and further comprises a shell, the shell is provided with an opening, and the top cover assembly is connected with the shell and covers the opening.
[0018] The electric core has the advantages that:
[0019] The utility model provides a kind of top cover assembly and electric core.The top cover assembly, upper plastic is arranged in the avoiding groove formed by cover plate piece concave, so that the height of upper plastic protruding cover plate piece is reduced, so as to reduce the height of pole post protruding cover plate piece under the premise of guaranteeing pole post protruding upper plastic, the height of the shell of electric core is released, correspondingly, higher height pole group assembly can be accommodated in shell, so as to improve the energy density of electric core. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is the top view of the electric core provided by the utility model;
[0021] Figure 2 It is Figure 1 the sectional view of A-A in it
[0022] Figure 3 is Figure 2 A local enlarged view at B in Figure.
[0023] In the drawings:
[0024] 1, top cover assembly; 11, cover plate; 12, pole; 121, column; 122, connecting circular table; 13, upper plastic; 14, adapter plate; 141, pole connecting part; 142, tab connecting part; 143, transition connecting part; 15, fixing ring; 16, sealing ring; 161, sealing part; 162, flange; 17, explosion-proof valve; 18, avoiding groove;
[0025] 2, outer shell;
[0026] 3, pole group assembly; 31, pole group body; 32, tab. DETAILED DESCRIPTION
[0027] The embodiments of the present application will be described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.
[0028] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.
[0029] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0030] Unless specifically stated and defined otherwise, "on" or "under" of a first feature in relation to a second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature in relation to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature in relation to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0031] The technical scheme of the utility model will be further illustrated below in combination with the drawings and through specific embodiments.
[0032] As a representative of green transportation, the electric vehicle has the advantages of energy saving, environmental protection, cleaning and the like compared with the traditional fuel vehicle, and reduces the environmental protection cost and economic cost of vehicle use. The endurance problem of the electric vehicle has been a key problem restricting the rapid development of the electric vehicle, and in order to improve the endurance mileage of the electric vehicle, it is necessary to use a high-energy-density power battery.
[0033] In order to improve the total energy of the power battery of the electric vehicle, the single cell of the power battery adopts a square shell structure, so as to arrange the single cells inside the power battery more closely, improve the space utilization rate and improve the volume energy density.
[0034] The embodiment provides a kind of cell, as shown in Figure 1 And Figure 2 The cell includes shell 2, pole group assembly 3 and top cover assembly 1, shell 2 is equipped with opening, pole group assembly 3 includes positive plate, diaphragm and negative plate, and positive plate, diaphragm and negative plate are placed in shell 2 in a certain form, and top cover structure is covered in the opening of shell 2. It is worth mentioning that one of shell 2 and top cover assembly 1 is provided with liquid injection hole, electrolyte can be injected into shell 2 through liquid injection hole, and finally liquid injection hole is sealed, i.e. the production of single cell is completed.
[0035] In order to enable single cell to charge and discharge normally, top cover structure includes cover sheet 11, cover sheet 11 is used to close the opening of shell 2, and pole post 12 is provided on cover sheet 11, and pole post 12 is used to connect with the lug 32 of pole group assembly 3. In order to guarantee the safety of single cell, top cover structure is further provided with explosion-proof valve 17, when thermal runaway occurs inside single cell, explosion-proof valve 17 can be broken, thereby playing a pressure relief role.
[0036] As shown in Figure 1 And Figure 2As shown, the pole group assembly 3 includes a pole group body 31 and a positive pole lug 32 and a negative pole lug 32 arranged on the pole group body 31. In correspondence with the positive pole lug 32 and the negative pole lug 32 of the pole group, two pole posts 12 are arranged on the cover sheet 11, one pole post 12 is connected to the positive pole lug 32 through the adapter sheet 14, and the other pole post 12 is connected to the negative pole lug 32 through the adapter sheet 14.
[0037] In order to increase the connection area of the pole post 12 and the adapter sheet 14 to reduce the internal resistance, the pole post 12 includes a post body 121 and a connecting circular platform 122, the post body 121 is arranged in the mounting hole, the connecting circular platform 122 is connected to the end of the post body 121 and is located on the side of the cover sheet 11 close to the pole lug 32, the adapter sheet 14 abuts against and is fixedly connected to the connecting circular platform 122. The connecting circular platform 122 is arranged inside the shell 2, and the area thereof is greater than the cross-sectional area of the post body 121, thereby increasing the connection area of the pole post 12 and the adapter sheet 14, facilitating welding, and improving the efficiency and yield.
[0038] It can be understood that the shell 2 is usually made of a metal material, such as aluminum, so the shell 2 can conduct electricity. In order to prevent internal short circuit of the battery cell, a protective film is arranged outside the pole group assembly 3, the protective film can make the positive pole sheet and the negative pole sheet more closely stacked together, and can also protect the pole sheet, and can prevent the pole sheet from contacting the shell to cause short circuit or leakage.
[0039] Similarly, the cover sheet 11 is also usually made of a metal material, such as aluminum, so in order to prevent internal short circuit of the battery cell, the top cover assembly 1 further includes a lower plastic, the lower plastic is arranged on the lower surface of the cover sheet 11, and the connecting circular platform 122 of the pole post 12 is separated from the cover sheet 11 by the lower plastic.
[0040] As shown in Figure 2 and Figure 3 The top cover assembly 1 further includes an upper plastic 13, the cover sheet 11 is provided with a mounting hole, the pole post 12 is arranged in the mounting hole, and at least part of the upper plastic 13 is located between the cover sheet 11 and the pole post 12 to separate the cover sheet 11 and the pole post 12. Generally, the upper plastic 13 is arranged on the upper surface of the cover sheet 11, and part of the upper plastic 13 is arranged in the mounting hole and abuts against the side wall of the post body 121 and the inner wall of the mounting hole, so as to ensure that the post body 121 of the pole post 12 does not contact the cover sheet 11.
[0041] In order to facilitate the connection of external circuit, the pole column 12 needs to protrude the upper plastic 13 by a certain height. Since the upper plastic 13 also protrudes the cover plate piece 11, the height of the pole column 12 protruding the cover plate piece 11 is relatively high. The arrangement space of the single battery cell in the power battery is from the top of the pole column 12 to the bottom of the shell 2. The part of the pole column 12 protruding the cover plate piece 11 occupies the arrangement space of the whole single battery cell, which limits the height of the shell 2 of the single battery cell, and also limits the height of the pole group assembly 3 in the shell 2, and affects the energy density of the single battery cell.
[0042] As shown in Figure 2 and Figure 3 To solve the above problems, in the top cover assembly 1 provided by the embodiment, the top cover plate part is concave to form an avoiding groove 18, and the mounting hole is arranged in the avoiding groove 18, and the upper plastic 13 is arranged in the avoiding groove 18. Since the upper plastic 13 is arranged in the avoiding groove 18 formed by the concave of the cover plate piece 11, the height of the upper plastic 13 protruding the cover plate piece 11 is reduced, and even the upper plastic 13 can be flush with the upper surface of the cover plate piece 11. Thus, the height of the pole column 12 protruding the cover plate piece 11 is reduced under the premise of ensuring that the pole column 12 protrudes the upper plastic 13, the height of the shell 2 of the battery cell is released, and correspondingly, the shell 2 can accommodate the pole group assembly 3 with a higher height, thereby improving the energy density of the battery cell.
[0043] Generally, the height of the pole column 12 protruding the cover plate piece 11 is about 3.2 mm. By arranging the avoiding groove 18 on the cover plate piece 11, the height of the pole column 12 protruding the cover plate piece 11 can be reduced to 0.5 mm to 1.5 mm, so the height of the shell 2 can be increased by 1.7 mm to 2.7 mm, that is, the height of the pole group assembly 3 can be increased by 1.7 mm to 2.7 mm, thereby improving the energy density of the battery cell under the premise of ensuring the arrangement space of the battery cell. Specifically, the height of the pole column 12 protruding the cover plate piece 11 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm.
[0044] It is worth noting that since the tab 32 of the pole group assembly 3 generally has a certain thickness, the pole column 12 is retracted into the shell 2 by a certain distance without causing the pole column 12 to abut against the pole group body 31, so that the connecting circular truncated cone 122 of the pole column 12 and the corresponding tab 32 overlap in the height direction of the battery cell, so that the pole column 12 and the tab 32 can share the height space of the battery cell, and thus the structure is feasible.
[0045] In the embodiment, one end of the adapter piece 14 is connected with the pole 12, and the other end of the adapter piece 14 is located beside the pole 12 to connect the corresponding tab 32. For the convenience of description, the adapter piece 14 includes a pole connecting portion 141 connected with the connecting circular platform 122 and a tab connecting portion 142 connected with the tab 32. Since the tab 32 overlaps the connecting circular platform 122 in the height direction of the battery cell, the distance between the tab connecting portion 142 and the cover plate 11 is smaller than the distance between the pole connecting portion 141 and the cover plate 11.
[0046] It is worth noting that the tab connecting portion 142 is abutted or spaced apart from the lower plastic, and the lower plastic can avoid the abutment between the tab connecting portion 142 and the cover plate 11.
[0047] Specifically, the adapter piece 14 further includes a transition connecting portion 143 connecting the pole connecting portion 141 and the tab connecting portion 142.
[0048] The pole connecting portion 141 and the tab connecting portion 142 are connected to form an integral whole through the transition connecting portion 143, and the pole connecting portion 141 and the transition connecting portion 143 and the transition connecting portion 143 and the tab connecting portion 142 both have creases, so that the pole connecting portion 141, the transition connecting portion 143 and the tab connecting portion 142 change the extension direction in turn, so that the shape of the adapter piece 14 is in a stable state and will not generate internal stress due to being bent and twisted, avoiding the deformation of the adapter piece 14 to abut other conductive structures to cause short circuit.
[0049] Further, the angle between the plane where the transition connecting portion 143 is located and the plane where the cover plate 11 is located is α, and 0° < α ≤ 90°. The avoiding groove 18 of the cover plate 11 has a high-low difference, and the part where the high-low changes is the side wall of the avoiding groove 18, and the adapter piece 14 realizes the upward extension of the pole connecting portion 141 through the transition connecting portion 143, so the projection of the transition connecting portion 143 on the cover plate 11 covers the side wall of the avoiding groove 18, which can avoid the deformation of the adapter piece 14 when the tab connecting portion 142 is close to the cover plate 11 and touches the side wall of the avoiding groove 18.
[0050] As Figure 2 and Figure 3As shown, the top cover assembly 1 further comprises a fixing ring 15, the fixing ring 15 is sleeved on the pole 12 and fixedly connected with the pole 12, the fixing ring 15 presses the upper plastic 13 in the avoiding groove 18. Since the upper plastic 13 is only sleeved on the outer periphery of the column body 121 of the pole 12, the connection between the two is unreliable and easy to be separated, while the fixing ring 15 is fixedly connected with the pole 12, and the fixing ring 15 presses the upper plastic 13 in the avoiding groove 18, so that the upper plastic 13 can be fixed, and the connection between the fixing ring 15 and the circular truncated cone 122 of the pole 12 can jointly clamp the cover plate 11, so that the pole 12, the upper plastic 13 and the lower plastic are all fixed on the cover plate 11.
[0051] It is worth noting that the fixing ring 15 is fixedly connected with the column body 121 of the pole 12, which can be sleeved on the column body 121 through interference fit, or can be fixed through welding.
[0052] In order to facilitate the connection between the pole 12 and the external circuit, the top of the pole 12 needs to protrude from the upper plastic 13, thereby forming a protruding structure, that is, the height of the upper plastic 13 protruding from the upper surface of the cover plate 11 is less than the height of the pole 12 protruding from the upper surface of the cover plate 11. With the upper surface of the cover plate 11 as the reference, the height of the pole 12 protruding is higher, which ensures that the top of the pole 12 can protrude from the upper plastic 13, thereby facilitating the connection with the external circuit.
[0053] As shown in Figure 2 and Figure 3 The top cover assembly 1 further comprises a sealing ring 16, the sealing ring 16 is sleeved on the pole 12 and located between the pole 12 and the cover plate 11, and the sealing ring 16 is configured to seal the gap between the pole 12 and the cover plate 11. The sealing ring 16 can seal the gap between the pole 12 and the cover plate 11, thereby ensuring that the electrolyte inside the battery cell does not leak to the outside of the battery cell, ensuring the sealing performance of the battery cell and improving the safety of the power battery.
[0054] Further, the sealing ring 16 comprises a sealing portion 161 and a flange 162 protruding from the outer periphery of the sealing portion 161, the sealing portion 161 is located between the cover plate 11 and the column body 121, and the flange 162 is located between the connecting circular truncated cone 122 and the cover plate 11. The cross section of the sealing ring 16 is L-shaped, so that the sealing ring 16 can be squeezed from two mutually perpendicular directions to play a sealing role, greatly improving the sealing effect.
[0055] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.
Claims
1. A cap assembly, characterized by, The top cover assembly (1) comprises: a cover plate (11) partially recessed to form a recessed groove (18), wherein a mounting hole is formed in the recessed groove (18), and a pole (12) is arranged in the mounting hole; an upper plastic (13) arranged in the recessed groove (18), wherein at least part of the upper plastic (13) is located between the cover plate (11) and the pole (12) to separate the cover plate (11) and the pole (12).
2. The roof assembly of claim 1, wherein, The top cover assembly (1) further comprises an adapter plate (14), one end of the adapter plate (14) is connected with the pole (12), and the other end of the adapter plate (14) is located beside the pole (12) to connect a corresponding tab (32).
3. The roof assembly of claim 2, wherein, The adapter plate (14) comprises a pole connecting portion (141) and a tab connecting portion (142), and the distance between the tab connecting portion (142) and the cover plate (11) is smaller than the distance between the pole connecting portion (141) and the cover plate (11).
4. The roof assembly of claim 3, wherein, The adapter plate (14) further comprises a transition connecting portion (143) connecting the pole connecting portion (141) and the tab connecting portion (142), and the angle between the plane where the transition connecting portion (143) is located and the plane where the cover plate (11) is located is α, and 0°<α≤90°.
5. The roof assembly of claim 2, wherein, The pole (12) comprises a column body (121) and a connecting circular cone (122), the column body (121) is arranged in the mounting hole, the connecting circular cone (122) is connected to the end of the column body (121) and located on the side of the cover plate (11) close to the tab (32), and the adapter plate (14) abuts against and is fixedly connected with the connecting circular cone (122).
6. The roof assembly of claim 1, wherein, The top cover assembly (1) further comprises a fixing ring (15) sleeved on the pole (12) and fixedly connected with the pole (12), and the fixing ring (15) tightly presses the upper plastic (13) in the recessed groove (18).
7. The roof assembly of claim 1, wherein, The height of the upper plastic (13) protruding from the upper surface of the cover plate (11) is smaller than the height of the pole (12) protruding from the upper surface of the cover plate (11).
8. The roof assembly of claim 1, wherein, The height of the pole (12) protruding from the upper surface of the cover plate (11) is 0.5mm-1.5mm.
9. The roof assembly of claim 1, wherein, The top cover assembly (1) further comprises a sealing ring (16) sleeved on the pole (12) and located between the pole (12) and the cover plate (11), and the sealing ring (16) is configured to seal the gap between the pole (12) and the cover plate (11).
10. An electric cell characterized by The top cover assembly (1) of any one of claims 1-9 further comprises a shell (2) provided with an opening, and the top cover assembly (1) is connected with the shell (2) and covers the opening.