CN113725530A - Power battery top cover component, power battery and battery module - Google Patents
Power battery top cover component, power battery and battery module Download PDFInfo
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- CN113725530A CN113725530A CN202110938434.6A CN202110938434A CN113725530A CN 113725530 A CN113725530 A CN 113725530A CN 202110938434 A CN202110938434 A CN 202110938434A CN 113725530 A CN113725530 A CN 113725530A
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- top cover
- plate
- power battery
- hole
- sealing ring
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- 238000007789 sealing Methods 0.000 claims abstract description 84
- 238000003825 pressing Methods 0.000 claims abstract description 74
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000011810 insulating material Substances 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 description 8
- 239000004020 conductor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/154—Lid or cover comprising an axial bore for receiving a central current collector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to a power battery top cover assembly, a power battery and a battery module. The power battery top cover assembly includes: the top cover plate comprises a first surface, a second surface opposite to the first surface and a through hole penetrating through the first surface and the second surface; the terminal assembly comprises an insulating sealing ring, a pressing plate and an electrode connecting plate; the insulating sealing ring seals the through hole, at least one part of the pressing plate is arranged on one side of the top cover plate, which is far away from the second surface, and the pressing plate and the top cover plate are fixed and tightly press the insulating sealing ring; the electrode connecting plate comprises a current collecting section and a connecting section which is intersected with the current collecting section, the current collecting section and the connecting section are of an integrated structure, the current collecting section penetrates through the insulating sealing ring and is in sealing fit with the insulating sealing ring, and the surface of the connecting section, back to the first surface, is exposed out of the pressing plate. The power battery top cover assembly provided by the embodiment of the invention is low in assembly difficulty, and the sealing state between the electrode connecting plate and the top cover plate is stable.
Description
The application is a divisional application provided by an invention patent application with the application number of 201711070860.2, the application date of 2017, 11, 03 and the name of "power battery top cover component, power battery and battery module", which is Ningde time New energy science and technology Co.
Technical Field
The invention relates to the technical field of power batteries, in particular to a power battery top cover assembly, a power battery and a battery module.
Background
The power battery is also called a secondary battery, and is a rechargeable battery. Power batteries are widely used, for example, low-capacity power batteries may be used for small electric vehicles, and high-capacity power batteries may be used for large electric vehicles. The power battery comprises a shell with a containing cavity and a top cover assembly covering an opening of the shell. The top cap subassembly includes the top cap piece and sets up positive post and negative pole post on the top cap piece. The positive pole post and the negative pole post pass through the top cap piece, and simultaneously in order to play the fixed action and prevent that positive pole post (or negative pole post) from deviating from the top cap piece, positive pole post (or negative pole post) have the base portion in the side of top cap piece near the holding cavity, and the base portion is connected with electrode subassembly electricity through the mass flow component. In the prior art, the positive pole (or the negative pole) and the current collecting component are of a split structure and are assembled into a whole structure in an assembling mode, but the structure is difficult to assemble, and the base part occupies the inner space of the shell, so that the energy density of the battery is reduced.
In order to solve the problem of the assembly difficulty, the pole and the current collecting component are taken as an integrated structure, a base part is simultaneously eliminated, and the pole and the top cover plate are sealed by plastic in an integrated injection molding mode in the prior art. However, the sealing method has the problems of air leakage and liquid leakage in the shell due to poor sealing, and has serious potential safety hazard.
Disclosure of Invention
The embodiment of the invention provides a power battery top cover component, a power battery and a battery module. The assembly difficulty of the top cover component of the power battery is low, and the sealing state between the electrode connecting plate and the top cover plate is stable.
An embodiment of the present invention provides a power battery top cover assembly, which includes: the top cover plate comprises a first surface, a second surface opposite to the first surface and a through hole penetrating through the first surface and the second surface; the terminal assembly comprises an insulating sealing ring, a pressing plate and an electrode connecting plate; the insulating sealing ring seals the through hole, at least one part of the pressing plate is arranged on one side of the top cover plate, which is far away from the second surface, and the pressing plate and the top cover plate are fixed and tightly press the insulating sealing ring; the electrode connecting plate comprises a current collecting section and a connecting section which is intersected with the current collecting section, the current collecting section and the connecting section are of an integrated structure, the current collecting section penetrates through the insulating sealing ring and is in sealing fit with the insulating sealing ring, and the surface of the connecting section, back to the first surface, is exposed out of the pressing plate; the pressing plate is provided with a sunken part and a limiting hole, the sunken part is arranged on the surface of the pressing plate, which is back to the first surface, and the limiting hole penetrates through the sunken part and extends towards the direction close to the first surface; the current collecting section sequentially penetrates through the limiting hole, the insulating sealing ring and the through hole.
According to one aspect of an embodiment of the invention, the top cover sheet is an insulating material.
According to one aspect of an embodiment of the invention, the connecting section is fixedly connected to the pressure plate, and the collecting section penetrates through the pressure plate.
According to an aspect of the embodiment of the present invention, the insulating seal ring is inserted into the through hole, and the through hole is tapered in a direction from the first surface to the second surface.
According to one aspect of an embodiment of the present invention, the first surface is provided with a recess, and the pressure plate is accommodated in the recess.
According to an aspect of the embodiment of the present invention, a surface of the connecting section facing away from the first surface protrudes beyond a surface of the pressure plate facing away from the first surface.
According to one aspect of the embodiment of the invention, the collecting section and the connecting section are both in a plate-shaped structure and are perpendicular to each other.
According to an aspect of the embodiment of the present invention, the connecting section includes a protruding portion protruding from the pressing plate, the protruding portion extends away from the first surface, and a side of the protruding portion near the first surface is provided with an accommodating cavity.
According to an aspect of the embodiment of the present invention, the connecting section further includes a first flange, the protruding portion is connected to the current collecting section through the first flange, and the first flange is in contact with a surface of the pressure plate facing the top cover sheet.
According to an aspect of the embodiment of the present invention, the connecting section further includes a first folded edge and a second folded edge disposed on opposite sides of the protruding portion, the protruding portion is connected to the current collecting section through the first folded edge, and the first folded edge and the second folded edge are respectively in contact with a surface of the pressing plate facing the top cover piece.
According to one aspect of an embodiment of the invention, the first flange is in contact with the insulating seal ring.
According to the power battery top cover assembly provided by the embodiment of the invention, the power battery top cover assembly comprises a top cover sheet and an electrode connecting plate. The top cover plate and the electrode connecting plate can be manufactured separately and then assembled with each other. Since the electrode connecting plate passes through the top cover sheet, it is necessary to ensure that a sealed state is maintained between the top cover sheet and the electrode connecting plate. The electrode connecting plate and the top cover plate of the embodiment of the invention are hermetically connected through the insulating sealing ring. Meanwhile, the pressing plate is arranged to apply pressure stress to the insulating sealing ring to compress the insulating sealing ring, so that the position stability of the insulating sealing ring is ensured, and the reliability of the sealing performance is improved. The power battery top cover assembly provided by the embodiment of the invention is low in assembly difficulty, and the sealing state between the electrode connecting plate and the top cover plate is stable.
According to another aspect of an embodiment of the present invention, there is provided a power battery including:
an electrode assembly including tabs; a case accommodating the electrode assembly, the case having an opening; and the power battery top cover assembly is as above, wherein the top cover plate seals the opening, the second surface of the top cover plate faces the shell, and the current collecting section is connected with the pole lug.
According to still another aspect of an embodiment of the present invention, there is provided a battery module including:
the bus bar and the power battery; the bus bar is welded with the connecting section, and the bus bar and the connecting section are made of the same metal material.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below by referring to the accompanying drawings.
FIG. 1 is an exploded view of a power battery top cover assembly according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a power cell top cover assembly according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a power cell top cover assembly according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a schematic cross-sectional view of a power cell top cover assembly according to another embodiment of the present invention;
fig. 6 is a partially enlarged view of fig. 5 at B.
In the drawings, the drawings are not necessarily to scale.
Description of the labeling:
1. a top cover sheet; 11. a first surface; 11a, a recess; 12. a second surface; 13. a through hole;
2. a terminal assembly; 21. an insulating seal ring; 22. pressing a plate; 22a, a recess; 22b, a limiting hole; 23. an electrode connecting plate; 231. a current collecting section; 232. a connecting section; 232a, a projection; 232b, a first folded edge; 232c and a second folded edge.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated for convenience in describing the invention and to simplify description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
For a better understanding of the present invention, a power battery top cover assembly according to an embodiment of the present invention will be described in detail below with reference to fig. 1 to 6.
As shown in fig. 1 and 2, the power battery top cover assembly of the embodiment of the invention is used for a power battery. The power battery top cover assembly comprises a top cover plate 1 and a terminal assembly 2 arranged on the top cover plate 1. The top cover plate 1 provides a supporting base and the terminal assembly 2 is connected to the top cover plate 1.
The top cover sheet 1 of the present embodiment includes a first surface 11, a second surface 12 opposite to the first surface 11, and a through hole 13 penetrating the first surface 11 and the second surface 12. The first surface 11 of the top coversheet 1 refers to all surfaces which are not in contact with the second surface 12 and which are visible from the side facing away from the second surface 12. The first surface 11 may be a whole plane or an uneven surface. The second surface 12 of the top coversheet 1 refers to all surfaces which are not in contact with the first surface 11 and which are visible from the side facing away from the first surface 11. The second surface 12 may be a whole plane or may be an uneven surface. The cross-sectional shape of the through-hole 13 may be circular, polygonal or kidney-shaped, but is not limited to the above listed shapes. Optionally, the through hole 13 is tapered in a direction from the first surface 11 to the second surface 12, such that a radial dimension of an aperture of the through hole 13 at the first surface 11 is larger than a dimension of an aperture of the through hole 13 at the second surface 12. When the power battery top cover assembly of the present embodiment is used for a power battery, the first surface 11 of the top cover sheet 1 is exposed to the external environment, and the second surface 12 faces the housing of the power battery.
In one embodiment, the top sheet 1 has a predetermined length, width and thickness. The first surface 11 and the second surface 12 are oppositely disposed in the thickness direction. The entire top cover sheet 1 may be manufactured by a press molding process or by machining, and in this case, the through-holes 13 may be machined by a machining process such as drilling.
As shown in fig. 3 and 4, the terminal assembly 2 of the embodiment of the present invention includes an insulating seal ring 21, a pressure plate 22, and an electrode connecting plate 23. One end of the electrode connecting plate 23 is connected to the insulating seal ring 21, and the other end is connected to the pressure plate 22. The electrode connection plate 23 includes a collector segment 231 and a connection segment 232 disposed to intersect the collector segment 231. Alternatively, the current collecting section 231 is disposed perpendicular to the connection section 232 so that the electrode connection plate 23 has an L-shape. The perpendicular is not strictly perpendicular, but the collecting section 231 is substantially at 90 ° to the connecting section 232. The electrode connecting plate 23 is an integral structure, can be manufactured by stamping, rolling or die forming, and has high mechanical rigidity and is not easy to deform or break. The current collecting segment 231 of the electrode connecting plate 23 is used to electrically connect with the electrode assembly, and the connection segment 232 is used to electrically connect with other conductive structural members, for example, the connection segment 232 is electrically connected with a bus bar. The electrode connecting plate 23 may be a positive electrode or a negative electrode. The electrode connecting plate 23 is manufactured using a metal conductive material, such as copper or aluminum.
The insulating seal ring 21 includes a central hole through which the current collecting section 231 of the electrode connecting section 232 is inserted and connected to the insulating seal ring 21. The current collecting section 231 of the electrode connecting section 232 is in interference fit with the central hole to ensure that the outer circumferential surface of the current collecting section 231 is in a sealed state with the hole wall of the central hole.
The insulating seal 21 seals the through hole 13 while the current collecting segment 231 of the electrode connecting plate 23, which penetrates the central hole, passes through the through hole 13 and the free end of the current collecting segment 231 passes over the second surface 12 so that the current collecting segment 231 is electrically connected to other conductive members, such as an electrode assembly. When the top cover plate 1 is made of a conductive material, the insulating seal ring 21 physically insulates and isolates the top cover plate 1 and the current collecting section 231 while sealing the through hole 13, thereby preventing the top cover plate 1 and the current collecting section 231 from being electrically connected. The connection section 232 of the electrode connection plate 23 is disposed opposite to the first surface 11 of the top cover sheet 1.
The pressing plate 22 is disposed on the side away from the second surface 12 and connected to the top cover sheet 1, i.e., on the side of the first surface 11 and connected to the top cover sheet 1. The pressing plate 22 is fixedly connected with the top cover plate 1 and compresses the insulating sealing ring 21 to apply pressure to the insulating sealing ring 21 to limit the position of the insulating sealing ring 21, so that the sealing reliability of the insulating sealing ring 21 is ensured, and the insulating sealing ring 21 is prevented from being separated from the part of the top cover plate 1 with the through hole 13 to cause sealing failure.
In one embodiment, the insulating and sealing ring 21 is a flat structure with a predetermined thickness, and the radial dimension of the insulating and sealing ring is larger than that of the hole of the through hole 13 on the first surface 11 of the top cover sheet 1, so that the insulating and sealing ring 21 covers the hole of the through hole 13 on the first surface 11 of the top cover sheet 1, and the peripheral edge of the insulating and sealing ring 21 is in sealing pressure joint with the annular area of the top cover sheet 1 surrounding the hole of the through hole 13. Thus, the opening of the through hole 13 on the first surface 11 of the top cover sheet 1 is blocked by the insulating seal ring 21. Because the pressing plate 22 applies a compressive stress to the insulating seal ring 21, the insulating seal ring 21 can be prevented from being subjected to an external force and being subjected to buckling deformation towards a direction away from the through hole 13, so that the deformation resistance of the insulating seal ring 21 is improved, and the situation that the insulating seal ring 21 is bent and deformed to cause the contact state between the insulating seal ring and the top cover plate 1 and further cause sealing failure is avoided.
Further, the surface of the insulating sealing ring 21 with the flat structure, which is close to the peripheral edge and faces the top cover plate 1, is coated with the sealant, so that after the insulating sealing ring 21 covers the hole of the through hole 13, which is located in the first surface 11 of the top cover plate 1, the insulating sealing ring 21 and the top cover plate 1 jointly extrude the sealant, so that the sealant forms a ring body surrounding the through hole 13 and located in the hole of the first surface 11 of the top cover plate 1, and the sealing reliability between the insulating sealing ring 21 and the top cover plate 1 is further ensured.
Alternatively, the insulating sealing ring 21 has elasticity, for example, the insulating sealing ring 21 is made of an elastic material such as rubber or silicone. Like this, under the effect of the support of clamp plate 22, insulating seal 21 can take place to warp to insulating seal 21 can compensate clamp plate 22 under the effect of self elastic recovery power and keep away from the displacement volume when top cap piece 1 takes place to remove, perhaps, can compensate clamp plate 22 or top cap piece 1's roughness, guarantees that clamp plate 22, insulating seal 21 and the contact surface laminating between the 1 three of top cap piece are inseparable, and then guarantees that insulating seal 21 is better more stable to the sealed effect of perforating hole 13.
In one embodiment, the insulating seal 21 is a cylindrical structure. The central bore of the insulating seal 21 extends axially along itself. The shape of the insulating seal ring 21 of the columnar structure is matched with the shape of the through hole 13, so that a part of the insulating seal ring 21 can be inserted into the through hole 13 and is in sealing fit with the through hole 13 under the pressing action of the pressing plate 22. Because the pressure plate 22 applies pressure stress to the insulating seal ring 21, the insulating seal ring 21 can be prevented from moving in a direction away from the through hole 13 under the action of external force, so that the external force impact resistance of the insulating seal ring 21 is improved, and the insulating seal ring 21 is prevented from moving to cause a contact state between itself and the hole wall of the through hole 13, and further cause sealing failure. A portion of the insulating seal ring 21 of the present embodiment protrudes from the first surface 11 of the top cover plate 1, so that the pressing plate 22 is tightly attached to the insulating seal ring 21 to apply an effective compressive stress to the insulating seal ring 21.
Further, the through hole 13 is gradually reduced from the first surface 11 to the second surface 12, and the insulating sealing ring 21 with a columnar structure is matched with the shape of the through hole 13, so that a part of the insulating sealing ring 21 can be inserted into the through hole 13 to a predetermined depth without penetrating out of another hole of the through hole 13, and simultaneously, under the abutting action of the pressing plate 22, the pressing plate 22 and the hole wall of the through hole 13 can jointly press the insulating sealing ring 21, so that the insulating sealing ring 21 is attached to the hole wall of the through hole 13 more tightly, and the sealing reliability of the insulating sealing ring 21 and the hole wall of the through hole 13 is further improved.
Alternatively, the insulating sealing ring 21 has elasticity, for example, the insulating sealing ring 21 is made of an elastic material such as rubber or silicone. Thus, under the abutting action of the pressing plate 22, the insulating seal ring 21 inserted into the through hole 13 can expand in volume in the through hole 13, so that on one hand, the outer peripheral surface of the insulating seal ring 21 is ensured to be attached to the hole wall of the through hole 13 more tightly, and on the other hand, if the pressing plate 22 displaces in the direction away from the through hole 13, the insulating seal ring 21 compensates the moving distance of the pressing plate 22 by itself under the action of the elastic restoring force, and simultaneously, the outer peripheral surface of the insulating seal ring 21 is still ensured to be in a contact state with the hole wall of the through hole 13, and further, the stable sealing state of the insulating seal ring 21 and the through hole 13 is ensured.
The through hole 13 of the top cover plate 1 of the embodiment of the invention is a relief hole, so that the current collecting section 231 penetrates through the top cover plate 1 from the through hole 13, and the insulating sealing ring 21 is used for sealing the through hole 13 to complete sealing, so as to prevent air flow or objects from passing through the through hole 13 and leaking to the external environment. Further, the pressure plate 22 is pressed against the insulating seal ring 21 to apply a compressive stress to the insulating seal ring 21 to restrict the insulating seal ring 21, so that the position of the insulating seal ring 21 is prevented from being displaced, and the stability of the sealing state between the insulating seal ring 21 and the through hole 13 is improved. In addition, the top cover plate 1, the insulating sealing ring 21 and the pressing plate 22 can be separately processed and manufactured, so that the processing and the manufacturing are simple, and the processing cost is reduced.
The pressing plate 22 of the embodiment of the invention is fixedly connected with the top cover plate 1 so as to apply pressure to the insulating sealing ring 21 to compress the insulating sealing ring 21. The pressing plate 22 of this embodiment is connected and fixed with the electrode connecting plate 23 to ensure the position stability of the electrode connecting plate 23, and avoid the situation that the position of the electrode connecting plate 23 is dislocated to cause the current collecting section 231 and the insulating sealing ring 21 to be separated from the sealing connection state. At least a portion of the surface of the connecting section 232 of the electrode connecting plate 23 facing away from the first surface 11 is exposed on the surface of the pressing plate 22 facing away from the first surface 11, so as to facilitate the electrical connection of the connecting section 232 with an external conductive member, for example, the connecting section 232 with a bus bar. Optionally, the connecting section 232 of the electrode connecting plate 23 is exposed out of the surface of the pressing plate 22 and protrudes out of the surface of the pressing plate 22 opposite to the first surface 11, so that position interference caused by the pressing plate 22 in a connection process of the connecting section 232 and an external conductive component is avoided, connection between the connecting section 232 and the external conductive component is facilitated, and reliable connection between the connecting section 232 and the external conductive component is ensured.
When the top cover sheet 1 is manufactured using a conductive material, the pressing plate 22 is manufactured using an insulating material, so that the pressing plate 22 physically insulates and isolates the electrode connecting plate 23 from the top cover sheet 1, preventing the electrode connecting plate 23 from being electrically connected to the top cover sheet 1. When the top cover sheet 1 is manufactured using an insulating material, the pressing plate 22 may be manufactured using an insulating material or a conductive material so that the electrode connecting plate 23 and the top cover sheet 1 are insulated from each other, preventing the electrode connecting plate 23 and the top cover sheet 1 from being electrically connected.
Alternatively, the pressing plate 22 of the present embodiment may be a prefabricated member, i.e., manufactured and molded in advance, and then assembled with the electrode connecting plate 23 and the top cover sheet 1. The platen 22 of the present embodiment may be an injection molded member. After the relative positions of the electrode connecting plate 23 and the top cover plate 1 are fixed, the pressing plate 22 is manufactured by an injection molding process.
In one embodiment, the first surface 11 of the top cover sheet 1 is provided with a recess 11 a. The pressing plate 22 is accommodated in the recess 11 a. The through hole 13 provided in the top cover sheet 1 communicates with the recess 11 a. When the pressing plate 22 of the present embodiment is a prefabricated member, the pressing plate 22 may be interference-fitted with the recess 11 a. When the pressing plate 22 of the present embodiment is an injection molding member, the concave portion 11a can be used as a mold to facilitate injection molding and forming of the pressing plate 22, thereby reducing the processing difficulty. Meanwhile, the injection-molded pressure plate 22 has stronger connecting force with the surface of the concave part 11a, and the connecting state is more reliable and stable. When the pressing plate 22 is formed by injection molding, the surface of the concave portion 11a may be provided with a plurality of ribs arranged side by side at intervals, so that the injection molding material may fill a gap formed between two adjacent ribs during injection molding. After the injection molding is completed, the convex ribs are embedded in the pressing plate 22, so that the connection strength of the pressing plate 22 and the top cover sheet 1 is improved.
When the material of the pressing plate 22 and the material of the top cover plate 1 are the same insulating material, the pressing plate 22 and the concave part 11a can be connected by welding, so that the connection strength of the pressing plate 22 and the concave part is improved. In one example, the pressure plate 22 and the top cover sheet 1 are both plastic, and the seam between the pressure plate 22 and the recess 11a can be joined using ultrasonic welding. After the pressing plate 22 of the above embodiment is connected to the top cover sheet 1, the pressing plate 22 can resist the impact of external force and is not easily disconnected from the top cover sheet 1. Optionally, the top cover sheet 1 has a convex ring body. The ring body encloses the recess 11 a.
In one embodiment, as shown in fig. 4, the connecting section 232 of the electrode connecting plate 23 is disposed on the surface of the pressing plate 22 facing away from the first surface 11 of the top cover sheet 1, and the current collecting section 231 penetrates through the pressing plate 22 to be connected with the insulating sealing ring 21. The surface of the insulating seal ring 21 facing the pressure plate 22 is in full contact with the surface of the pressure plate 22 facing the top cover sheet 1. The pressing plate 22 completely isolates the connecting section 232 from the top cover sheet 1. Thus, when the top cover sheet 1 is of a conductive material, the pressing plate 22 can keep the connection section 232 in an insulated state from the top cover sheet 1.
Optionally, a surface of the pressure plate 22 facing away from the first surface 11 is provided with a recess 22a and a limiting hole 22b penetrating the recess 22a and extending toward the first surface 11. The stopper hole 22b is disposed opposite to the through hole 13 so that the manifold 231 can pass through the stopper hole 22b, the insulating gasket 21, and the through hole 13 in order and pass over the second surface 12 of the top cover sheet 1. A part of the connection section 232 is buried in the recess 22a, so that the contact area between the connection section 232 and the pressing plate 22 is increased, the connection strength is improved, and the connection section 232 is prevented from tilting in a direction away from the pressing plate 22. Meanwhile, the connecting section 232 is simultaneously limited by the concave part 22a and the limiting hole 22b of the pressing plate 22, so that the position displacement of the connecting section 232 is avoided. In one example, the current collecting segment 231 and the connection segment 232 of the electrode connection plate 23 are each of a flat plate-shaped structure and are perpendicular to each other such that the electrode connection plate 23 has an L-shape. The perpendicular is not strictly perpendicular, but the collecting section 231 is substantially at 90 ° to the connecting section 232. The electrode connecting plate 23 can be manufactured and molded by stamping.
In one embodiment, as shown in fig. 5 and 6, the connection section 232 of the electrode connection plate 23 includes a projection 232a projecting from a surface of the platen 22 facing away from the top cover sheet 1. The projection 232a extends away from the first surface 11 of the top cover sheet 1. The protrusion 232a is provided with an accommodation chamber on a side close to the first surface 11 of the top cover sheet 1. The electrode connecting plate 23 of the present embodiment may be processed by stamping. After the blank is subjected to the press working, the manifold section 231, the connection section 232, and the projection 232a on the connection section 232 are formed. The projection 232a of the present embodiment penetrates from the surface of the pressure plate 22 facing the first surface 11 of the top cover sheet 1, and penetrates from the surface of the pressure plate 22 facing away from the first surface 11 of the top cover sheet 1. The pressing plate 22 can limit the connecting section 232 to move along the direction parallel to the top cover plate 1, and the connection stability of the electrode connecting plate 23 is improved. Here, the parallelism is not strictly parallel, but the moving direction of the connecting section 232 is substantially parallel to the extending direction of the top-sheet 1.
Alternatively, the platen 22 may be a prefabricated member. When the pressing plate 22 is a prefabricated component, the pressing plate 22 includes a plugging hole. The protruding portion 232a is inserted into the insertion hole and the shape of the protruding portion is matched with that of the insertion hole. The radial dimension of the projection 232a becomes smaller in the direction away from the first surface 11, so that the pressing plate 22 can restrict the play of the connecting section 232 in the direction away from the top lid sheet 1, further improving the connection stability of the electrode connecting plate 23. The platen 22 may also be an injection molded component.
Optionally, the connecting section 232 of the electrode connecting plate 23 further comprises a first fold 232 b. The projection 232a is connected to the manifold 231 by a first flange 232 b. The first flange 232b of the connecting section 232 is connected to the surface of the pressing plate 22 facing the first surface 11 of the top-cover sheet 1. The first flange 232b and the protruding portion 232a are configured to be step-shaped structures, so that a portion of the pressing plate 22 is pressed against the first flange 232b to further limit the connecting section 232 through the first flange 232b, prevent the connecting section 232 from being warped or shifted in a direction away from the top cover plate 1, and avoid the connecting section 232 from being dislocated to affect a connection state of the current collecting section 231 and the electrode assembly.
When the insulating sealing ring 21 is sleeved on the current collecting section 231, the first folding edge 232b can limit the insulating sealing ring 21. A part of the insulating seal ring 21 is in contact with the surface of the pressure plate 22 facing the top cover sheet 1, and the other part is in contact with the surface of the first flange 232b facing the top cover sheet 1. Thus, the insulating gasket 21 is simultaneously pressed by the pressing plate 22 and the first folded edge 232 b. The part of the insulating seal ring 21 protruding out of the first surface 11 of the top cover plate 1 can position the connecting section 232, so that a gap is formed between the connecting section 232 and the top cover plate 1, the connecting section 232 is prevented from contacting the top cover plate 1, on one hand, the total pressure of the insulating seal ring 21 is prevented from being reduced due to the fact that the connecting section 232 contacts the top cover plate 1, then the pressing force between the insulating seal ring 21 and the through hole 13 is reduced, and the sealing effect between the insulating seal ring 21 and the through hole 13 is reduced.
Optionally, the connecting section 232 of the electrode connecting plate 23 further comprises a second flange 232 c. The first and second flanges 232b and 232c are disposed at opposite sides of the protruding portion 232a, respectively. The projection 232a is connected to the manifold 231 by a first flange 232b, and a second flange 232c is at the free end. The first flange 232b and the second flange 232c are respectively in contact with the surface of the pressing plate 22 facing the top-cover sheet 1. The first folded edge 232b, the protruding portion 232a and the second folded edge 232c are configured to be step-shaped structures, so that the portion of the pressing plate 22 surrounding the protruding portion 232a is pressed against the first folded edge 232b and the second folded edge 232c, the connecting section 232 is further limited by the first folded edge 232b and the second folded edge 232c, the connecting section 232 is prevented from being warped and deformed or moved away from the top cover plate 1, and the connecting section 232 is prevented from being displaced to affect the connection state of the current collecting section 231 and the electrode assembly. When the pressure plate 22 is a prefabricated member, the pressure plate 22 includes a stepped hole. The step face of the stepped hole faces the top cover plate 1. The protrusion 232a is inserted into the hole with smaller radial dimension in the stepped hole, and the shapes of the two are matched. The first folded edge 232b and the second folded edge 232c are respectively inserted into the holes with larger radial dimension in the stepped holes, and the first folded edge 232b and the second folded edge 232c are pressed on the stepped surface. The pressure plate 22 may also be an injection molded member that is directly formed as a unitary structure with the connecting section 232.
In one embodiment, the top cover sheet 1 of the present embodiment may be manufactured using an insulating material. The top cover sheet 1 of the present embodiment may be provided with two terminal assemblies 2 of the present embodiment at the same time. One terminal assembly 2 serves as a positive electrode and the other terminal assembly 2 serves as a negative electrode. In this embodiment, since the top cover sheet 1 is insulated from itself, when the electrode connecting plate 23 included in each terminal assembly 2 comes into contact with the top cover sheet 1, the electrode connecting plate 23 as a positive electrode and the electrode connecting plate 23 as a negative electrode do not short-circuit, and the safety of the top cover assembly is improved. The top cover sheet 1 of insulating material is itself lightweight. Alternatively, the top cover sheet 1 is manufactured using engineering plastic processing.
The power battery top cover assembly of the embodiment of the invention comprises a top cover sheet 1 and an electrode connecting plate 23. Both the top cover sheet 1 and the electrode connecting plate 23 may be separately manufactured and then assembled with each other. Since the electrode connecting plate 23 penetrates the top cover sheet 1, it is necessary to ensure that a sealed state is maintained between the top cover sheet 1 and the electrode connecting plate 23. The electrode connecting plate 23 and the top cover plate 1 of the embodiment of the invention are hermetically connected through the insulating sealing ring 21. Meanwhile, the pressing plate 22 is arranged to apply a pressure stress to the insulating sealing ring 21 so as to compress the insulating sealing ring 21, ensure the position stability of the insulating sealing ring 21, and improve the reliability and stability of the sealing state between the insulating sealing ring 21 and the top cover plate 1 and between the insulating sealing ring 21 and the current collecting section 231. The power battery top cover assembly provided by the embodiment of the invention is low in assembly difficulty, and the electrode connecting plate 23 and the top cover plate 1 are reliably sealed.
The embodiment of the invention also provides a power battery, which comprises a shell, an electrode assembly and the power battery top cover assembly of the embodiment. The housing includes a receiving portion having an opening. The electrode assembly is disposed in the receiving part. The electrode assembly includes tabs exposed to the outside. The power battery top cover component closes the opening and forms a closed space with the accommodating part of the shell. The second surface 12 of the top cover sheet 1 faces the housing's accommodation. The collector segments 231 of the electrode connection plate 23 extend to the receiving portions and are electrically connected with the tabs. Because a good sealing state is kept between the top cover plate 1 and the electrode connecting plate 23 in the embodiment, after the power battery top cover assembly is hermetically connected with the casing through the top cover plate 1, the air tightness of a closed space formed by enclosing the top cover plate 1 and the casing is effectively ensured, and the leakage of substances or gases in the accommodating part of the casing is prevented, for example, the leakage of electrolyte through the joint of the electrode connecting plate 23 and the top cover plate 1 or the joint of the top cover plate 1 and the casing is prevented. Therefore, the power battery provided by the embodiment of the invention has high self safety coefficient.
The embodiment of the invention also provides a battery module, which comprises more than two power batteries and a bus bar. And two adjacent power batteries are electrically connected through the bus bar. One end of the bus bar is welded to the connection section 232 of one of the adjacent two power batteries, and the other end is welded to the connection section 232 of the other of the adjacent two power batteries. The bus bar and the connecting section 232 are made of the same metal material, so that the connection rigidity of the bus bar and the connecting section 232 is improved, and the bus bar is not easy to separate from the connecting section 232. The bus bar and the connecting section 232 may both be copper or aluminum.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (13)
1. A power battery top cover assembly, comprising:
a top cover sheet (1) including a first surface (11), a second surface (12) opposite to the first surface (11), and a through hole (13) penetrating the first surface (11) and the second surface (12); and
the terminal assembly (2) comprises an insulating sealing ring (21), a pressure plate (22) and an electrode connecting plate (23);
the insulating sealing ring (21) seals the through hole (13), at least one part of the pressing plate (22) is arranged on one side, far away from the second surface (12), of the top cover plate (1), and the pressing plate (22) and the top cover plate (1) are fixed and press the insulating sealing ring (21); the electrode connecting plate (23) comprises a current collecting section (231) and a connecting section (232) which is intersected with the current collecting section (231), the current collecting section (231) and the connecting section (232) are of an integrated structure, the current collecting section (231) penetrates through the insulating sealing ring (21) and is in sealing fit with the insulating sealing ring (21), and the surface of the connecting section (232) facing away from the first surface (11) is exposed out of the pressing plate (22);
the pressing plate (22) is provided with a concave part (22a) and a limiting hole (22b), the concave part (22a) is arranged on the surface of the pressing plate (22) back to the first surface (11), and the limiting hole (22b) penetrates through the concave part (22a) and extends towards the direction close to the first surface (11); the current collecting section (231) sequentially penetrates through the limiting hole (22b), the insulating sealing ring (21) and the through hole (13).
2. Power battery top cover assembly according to claim 1, characterized in that the top cover sheet (1) is an insulating material.
3. The power battery top cover assembly according to claim 1, wherein the connecting segment (232) is fixedly connected with the pressure plate (22), and the current collecting segment (231) penetrates through the pressure plate (22).
4. Power battery top cover assembly according to claim 1, characterized in that the insulating sealing ring (21) is plugged into the through hole (13), the through hole (13) tapering in the direction from the first surface (11) to the second surface (12).
5. Power battery top cover assembly according to claim 1, characterized in that a recess (11a) is provided on the first surface (11), the pressure plate (22) being accommodated in the recess (11 a).
6. The power battery top cover assembly according to claim 1, wherein a surface of the connecting section (232) facing away from the first surface (11) protrudes above a surface of the pressure plate (22) facing away from the first surface (11).
7. Power battery top cover assembly according to any of claims 1 to 6, characterized in that the collecting section (231) and the connecting section (232) are both plate-like structures and perpendicular to each other.
8. The power cell roof cover assembly according to any one of claims 1 to 6, characterized in that the connecting section (232) comprises a protrusion (232a) protruding from the pressure plate (22), the protrusion (232a) extending away from the first surface (11), a side of the protrusion (232a) adjacent to the first surface being provided with a receiving cavity.
9. The power battery top cover assembly according to claim 8, wherein the connecting section (232) further comprises a first folded edge (232b), the protrusion (232a) is connected with the current collecting section (231) through the first folded edge (232b), and the first folded edge (232b) is in contact with a surface of the pressure plate facing the top cover sheet.
10. The power battery top cover assembly according to claim 8, wherein the connecting section (232) further comprises a first folded edge (232b) and a second folded edge (232c) which are arranged on two opposite sides of the protruding portion (232a), the protruding portion (232a) is connected with the collecting section (231) through the first folded edge (232b), and the first folded edge (232b) and the second folded edge (232c) are respectively in contact with the surface of the pressing plate (22) facing the top cover plate (1).
11. The power battery top cover assembly according to claim 10, wherein the first flange (232b) is in contact with the insulating seal ring (21).
12. A power cell, comprising:
an electrode assembly including tabs;
a case accommodating the electrode assembly, the case having an opening; and
the power cell roof assembly according to any of the claims 1 to 11, wherein the top cover sheet (1) closes the opening, the second surface (12) of the top cover sheet (1) faces the housing, and the current collecting segments (231) are electrically connected with the tabs.
13. A battery module, comprising:
a busbar and two or more power cells according to claim 12;
the bus bar is welded with the connecting section (232), and the bus bar and the connecting section (232) are made of the same metal material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110938434.6A CN113725530B (en) | 2017-11-03 | 2017-11-03 | Top cover assembly of power battery, power battery and battery module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711070860.2A CN109755422B (en) | 2017-11-03 | 2017-11-03 | Power battery top cover component, power battery and battery module |
| CN202110938434.6A CN113725530B (en) | 2017-11-03 | 2017-11-03 | Top cover assembly of power battery, power battery and battery module |
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| CN201711070860.2A Division CN109755422B (en) | 2017-11-03 | 2017-11-03 | Power battery top cover component, power battery and battery module |
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| CN113725530A true CN113725530A (en) | 2021-11-30 |
| CN113725530B CN113725530B (en) | 2024-02-23 |
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| CN202110938434.6A Active CN113725530B (en) | 2017-11-03 | 2017-11-03 | Top cover assembly of power battery, power battery and battery module |
| CN201711070860.2A Active CN109755422B (en) | 2017-11-03 | 2017-11-03 | Power battery top cover component, power battery and battery module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110176559A (en) * | 2019-05-24 | 2019-08-27 | 东莞百思利新能源科技有限公司 | Secondary cell top cover |
| CN112490548B (en) * | 2020-11-13 | 2022-07-12 | 广东技术师范大学 | Power battery electrode sealing device |
| CN113013526B (en) * | 2021-04-02 | 2022-10-11 | 广东微电新能源有限公司 | Battery cover plate, battery and preparation method of battery |
| CN116487788B (en) * | 2023-06-14 | 2023-10-31 | 宁德时代新能源科技股份有限公司 | Shell assembly, battery cell, battery and electric equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113725531A (en) | 2021-11-30 |
| CN113725531B (en) | 2023-11-03 |
| CN109755422B (en) | 2021-09-14 |
| CN109755422A (en) | 2019-05-14 |
| CN113725530B (en) | 2024-02-23 |
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