CN113725530B - Top cover assembly of power battery, power battery and battery module - Google Patents
Top cover assembly of power battery, power battery and battery module Download PDFInfo
- Publication number
- CN113725530B CN113725530B CN202110938434.6A CN202110938434A CN113725530B CN 113725530 B CN113725530 B CN 113725530B CN 202110938434 A CN202110938434 A CN 202110938434A CN 113725530 B CN113725530 B CN 113725530B
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- top cover
- pressing plate
- sealing ring
- section
- current collecting
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- 238000007789 sealing Methods 0.000 claims abstract description 106
- 238000003825 pressing Methods 0.000 claims abstract description 87
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 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
- 238000000034 method Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000006073 displacement reaction 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
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
- 239000013013 elastic material Substances 0.000 description 2
- 239000007789 gas 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
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 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
- 238000005096 rolling process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 cap subassembly includes: a top cover sheet including a first surface, a second surface opposite to the first surface, and a through hole penetrating 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 far away from the second surface, and the pressing plate and the top cover plate are fixed and 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, which is opposite to the first surface, is exposed out of the pressing plate. The power battery top cover assembly provided by the embodiment of the invention has the advantages that the assembly difficulty is low, and the sealing state between the electrode connecting plate and the top cover sheet is stable.
Description
The application is based on the application number 201711070860.2, the application date is 2017, 11 and 03, and the application is a divisional application of the invention patent application with the name of 'power battery top cover assembly, power battery and battery module' of Ningde New energy science and technology Co., ltd.
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 cell includes a housing having a receiving cavity and a top cap assembly covering an opening of the housing. The top cap assembly includes a top cover sheet, and positive and negative electrode posts disposed on the top cover sheet. The positive electrode post and the negative electrode post pass through the top cover plate, and simultaneously, in order to play a role in fixing and prevent the positive electrode post (or the negative electrode post) from falling out of the top cover plate, the positive electrode post (or the negative electrode post) is provided with a base body part on one side of the top cover plate, which is close to the accommodating cavity, and the base body part is electrically connected with the electrode assembly through the current collecting member. In the prior art, the positive pole (or the negative pole) and the current collecting member are of split structures, and are assembled into a whole structure in an assembling mode, but the structure is difficult to assemble, and the base body part occupies the internal space of the shell, so that the energy density of the battery is reduced.
In order to solve the above-mentioned difficult problem of assembly, the prior art has eliminated the base portion simultaneously with the pole and the current collecting member as an integral structure, and sealed the pole and the top cover piece with plastic by means of integral injection molding. However, this sealing method has a problem of leakage and gas leakage in the housing due to poor sealing, and has serious safety hazards.
Disclosure of Invention
The embodiment of the invention provides a power battery top cover assembly, a power battery and a battery module. The power battery top cover assembly is low in assembly difficulty, and the sealing state between the electrode connecting plate and the top cover sheet is stable.
In one aspect, an embodiment of the present invention provides a power battery top cap assembly, including: a top cover sheet including a first surface, a second surface opposite to the first surface, and a through hole penetrating 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 far away from the second surface, and the pressing plate and the top cover plate are fixed and 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, which is opposite to the first surface, is exposed out of the pressing plate; the pressing plate is provided with a concave part and a limiting hole, the concave part is arranged on the surface of the pressing plate, which is back to the first surface, and the limiting hole penetrates through the concave part and extends towards the direction close to the first surface; the current collecting section sequentially passes through the limiting hole, the insulating sealing ring and the through hole.
According to one aspect of an embodiment of the invention, the 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 current collecting section passes through the pressure plate.
According to one aspect of the embodiment of the invention, the insulating sealing ring is inserted into the through hole, and the through hole tapers from the first surface to the second surface.
According to one aspect of an embodiment of the invention, the first surface is provided with a recess in which the platen is received.
According to one aspect of the embodiment of the invention, the surface of the connecting section facing away from the first surface protrudes from the surface of the pressing plate facing away from the first surface.
According to one aspect of the embodiment of the invention, the current collecting section and the connecting section are both plate-shaped structures and are mutually perpendicular.
According to one aspect of the embodiment of the invention, the connecting section comprises a protruding part protruding from the pressing plate, the protruding part extends away from the first surface, and a containing cavity is arranged on one side, close to the first surface, of the protruding part.
According to one aspect of an embodiment of the invention, the connecting section further comprises a first flange by which the projection is connected to the collecting section, the first flange being in contact with the surface of the pressure plate facing the top cover sheet.
According to one aspect of the embodiment of the present invention, the connection section further includes a first flange and a second flange disposed at opposite sides of the protrusion, the protrusion being connected to the current collecting section by the first flange, the first flange and the second flange being respectively in contact with surfaces of the pressing plate facing the top cover sheet.
According to one aspect of an embodiment of the invention, the first flange is in contact with the insulating sealing ring.
The power battery top cover assembly provided by the embodiment of the invention comprises a top cover plate and an electrode connecting plate. The cover sheet and the electrode connecting plate may be manufactured separately and then assembled with each other. Since the electrode connecting plate passes through the top sheet, it is necessary to ensure that a sealed state is maintained between the top sheet and the electrode connecting plate. According to the embodiment of the invention, the electrode connecting plate and the top cover sheet are in sealing connection through the insulating sealing ring. And meanwhile, the pressing plate is arranged to apply compressive stress to the insulating sealing ring so as to press the insulating sealing ring, ensure the position stability of the insulating sealing ring and improve the reliability of sealing performance. The power battery top cover assembly provided by the embodiment of the invention has the advantages that the assembly difficulty is low, and the sealing state between the electrode connecting plate and the top cover sheet is stable.
According to another aspect of an embodiment of the present invention, there is provided a power battery including:
an electrode assembly including a tab; a case accommodating the electrode assembly, the case having an opening; and the power battery top cover assembly is characterized in that the top cover sheet closes the opening, the second surface of the top cover sheet faces the shell, and the current collecting section is connected with the tab.
According to still another aspect of the embodiment of the present invention, there is provided a battery module including:
a busbar and a power cell as described above; 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 cell top cap 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 cap assembly according to one 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 cap assembly according to another embodiment of the present invention;
fig. 6 is a partial enlarged view at B in fig. 5.
In the drawings, the drawings are not drawn to scale.
Marking:
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. a pressing plate; 22a, a recess; 22b, limiting holes; 23. an electrode connection plate; 231. a current collecting section; 232. a connection section; 232a, a projection; 232b, first hem; 232c, second hem.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying 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 embodiments described.
In the description of the present invention, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present invention and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
For a better understanding of the present invention, a power cell top cap assembly according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 6.
As shown in fig. 1 and 2, the power battery top cap assembly of the embodiment of the present invention is used for a power battery. The power cell top cover assembly includes a top cover sheet 1 and a terminal assembly 2 provided on the top cover sheet 1. The top cover sheet 1 provides a supporting foundation and the terminal assembly 2 is attached to the top cover sheet 1.
The roof 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 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 may be a rugged surface. The second surface 12 of the 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 full plane or may be a rugged surface. The cross-sectional shape of the through hole 13 may be a circle, a polygon, or a kidney shape, but is not limited to the above-listed shapes. Optionally, the through-hole 13 tapers in a direction from the first surface 11 to the second surface 12 such that the radial dimension of the aperture of the through-hole 13 at the first surface 11 is larger than the dimension of the 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 sheet 1 may be manufactured by a molding process or by machining, and in this case, the through-holes 13 may be machined, for example, by 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 pressing plate 22, and an electrode connection plate 23. One end of the electrode connecting plate 23 is connected with the insulating sealing ring 21, and the other end is connected with the pressing plate 22. The electrode connection plate 23 includes a current collecting section 231 and a connection section 232 intersecting the current collecting section 231. Alternatively, the current collecting section 231 is disposed perpendicular to the connection section 232 such that the electrode connection plate 23 has an L-shape. The vertical here is not strictly vertical, but the collecting section 231 is substantially 90 ° from the connecting section 232. The electrode connection plate 23 has an integral structure, and can be manufactured by stamping, rolling or die forming, for example, and has high mechanical rigidity and is not easy to deform or break. The current collecting section 231 of the electrode connecting plate 23 is used for electrical connection with the electrode assembly, and the connecting section 232 is used for electrical connection with other conductive structural members, for example, the connecting section 232 is electrically connected with a bus bar. The electrode connection plate 23 may be a positive electrode or a negative electrode. The electrode connection plate 23 is manufactured by machining a metal conductive material, such as copper or aluminum.
The insulating sealing ring 21 includes a central hole through which the current collecting section 231 of the electrode connection section 232 is inserted and connected to the insulating sealing ring 21. The current collecting section 231 of the electrode connection section 232 is interference fit with the central hole to ensure a sealed state between the outer circumferential surface of the current collecting section 231 and the wall of the central hole.
The insulating sealing ring 21 seals the through hole 13, while the current collecting section 231 penetrating the central hole on the electrode connecting plate 23 penetrates the through hole 13, and the free end of the current collecting section 231 passes over the second surface 12, so that the current collecting section 231 is electrically connected with other conductive members, which may be electrode assemblies. When the top cover sheet 1 is made of a conductive material, the insulating seal ring 21 seals the through hole 13 and also physically insulates the top cover sheet 1 from the current collecting section 231, thereby avoiding electrical connection of the two. The connection section 232 of the electrode connection plate 23 is disposed opposite the first surface 11 of the top cover sheet 1.
The pressure plate 22 is arranged on the side remote from the second surface 12 and connected to the top sheet 1, i.e. on the side of the first surface 11 and connected to the top sheet 1. The pressing plate 22 is fixedly connected with the top cover sheet 1 and presses 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 sealing failure caused by the fact that the insulating sealing ring 21 is separated from contact with the part of the top cover sheet 1 where the through hole 13 is formed is avoided.
In one embodiment, the insulating sealing ring 21 is a flat structure having a predetermined thickness, and has a radial dimension larger than that of the aperture of the through hole 13 at the first surface 11 of the top cover sheet 1, so that the insulating sealing ring 21 entirely covers the aperture of the through hole 13 at the first surface 11 of the top cover sheet 1, and the peripheral edge of the insulating sealing ring 21 is in sealing pressure contact with the annular region of the top cover sheet 1 surrounding the aperture of the through hole 13. Thus, the opening of the through-hole 13 at the first surface 11 of the cover sheet 1 is closed by the insulating sealing ring 21. Since the pressing plate 22 applies compressive stress to the insulating seal ring 21, the insulating seal ring 21 can be prevented from being subjected to external force to generate buckling deformation in 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 insulating seal ring to be separated from the top cover sheet 1 to cause sealing failure is avoided.
Further, the surface, close to the peripheral edge, of the insulating sealing ring 21 with a flat structure and facing the top cover sheet 1 is coated with sealant, so that after the insulating sealing ring 21 covers the through hole 13 and is positioned at the opening of the first surface 11 of the top cover sheet 1, the insulating sealing ring 21 and the top cover sheet 1 jointly squeeze the sealant, so that the sealant forms a ring body surrounding the through hole 13 and positioned at the opening of the first surface 11 of the top cover sheet 1, and the sealing reliability between the insulating sealing ring 21 and the top cover sheet 1 is further ensured.
Optionally, the insulating seal 21 has elasticity, for example, the insulating seal 21 is manufactured by using an elastic material such as rubber or silica gel. Like this, under the butt pressure effect of clamp plate 22, insulating sealing washer 21 can take place to warp to insulating sealing washer 21 can compensate the displacement volume when clamp plate 22 kept away from top cap piece 1 and takes place to remove under the effect of self elastic restoring force, perhaps can compensate the surface roughness of clamp plate 22 or top cap piece 1, guarantees that the contact surface laminating between clamp plate 22, insulating sealing washer 21 and the top cap piece 1 is inseparable, and then guarantees that insulating sealing washer 21 is better more stable to the sealed effect of through-hole 13.
In one embodiment, the insulating seal 21 is a cylindrical structure. The central hole 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 can be in sealing fit with the through hole 13 under the pressing action of the pressing plate 22. Since the pressing plate 22 applies compressive stress to the insulating seal ring 21, the insulating seal ring 21 can be prevented from moving away from the through hole 13 due to 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 be separated from the contact state with the wall of the through hole 13, thereby causing sealing failure. A portion of the insulating sealing ring 21 of the present embodiment protrudes beyond the first surface 11 of the cover sheet 1 so that the pressing plate 22 is tightly fitted with the insulating sealing ring 21 to apply an effective compressive stress to the insulating sealing ring 21.
Further, the direction of the through hole 13 from the first surface 11 to the second surface 12 is gradually reduced, 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 preset depth without penetrating out from the other hole opening of the through hole 13, and meanwhile, under the action of the pressing plate 22, the pressing plate 22 and the hole wall of the through hole 13 can jointly extrude 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.
Optionally, the insulating seal 21 has elasticity, for example, the insulating seal 21 is manufactured by using an elastic material such as rubber or silica gel. Thus, under the action of the pressing plate 22, the insulating sealing ring 21 inserted into the through hole 13 can undergo volume expansion in the through hole 13, so that on one hand, the outer peripheral surface of the insulating sealing ring 21 is guaranteed to be attached to the wall of the through hole 13 more tightly, and on the other hand, if the pressing plate 22 is displaced in the direction away from the through hole 13, the insulating sealing ring 21 compensates the moving distance of the pressing plate 22 under the action of elastic restoring force, and meanwhile, the outer peripheral surface of the insulating sealing ring 21 is still guaranteed to be in contact with the wall of the through hole 13, and further, the sealing state of the insulating sealing ring 21 and the through hole 13 is guaranteed to be stable.
The through hole 13 provided in the top cover sheet 1 according to the embodiment of the present invention is a relief hole, so that the current collecting section 231 passes through the top cover sheet 1 from the through hole 13, and simultaneously, the insulating sealing ring 21 is used to seal the through hole 13 to prevent air flow or objects from passing through the through hole 13 and leaking to the external environment. Further, the pressing plate 22 is used for pressing the insulating sealing ring 21 to apply a compressive stress to the insulating sealing ring 21 to limit the insulating sealing ring 21, so that the position of the insulating sealing ring 21 is prevented from being shifted, and the sealing state stability between the insulating sealing ring 21 and the through hole 13 is improved. In addition, the top cover sheet 1, the insulating sealing ring 21 and the pressing plate 22 can be manufactured independently, so that the manufacturing is simple, and the manufacturing cost is reduced.
The pressing plate 22 in the embodiment of the present invention is fixedly connected to the top cover sheet 1 so as to be capable of pressing the insulating seal ring 21 by applying pressure to the insulating seal ring 21. The pressing plate 22 of the embodiment is fixedly connected with the electrode connecting plate 23 to ensure the position stability of the electrode connecting plate 23 and avoid the situation that the current collecting section 231 and the insulating sealing ring 21 are separated from sealing connection state due to the position dislocation of the electrode connecting plate 23. At least a portion of the surface 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 that the connecting section 232 is electrically connected with an external conductive member, for example, the connecting section 232 is electrically connected with a bus bar. Optionally, the connecting section 232 of the electrode connecting plate 23 is exposed from the surface of the pressing plate 22 protruding from the surface of the pressing plate 22 opposite to the first surface 11, so that the pressing plate 22 is prevented from interfering the connecting process of the connecting section 232 and the external conductive member, the connecting section 232 is convenient to connect with the external conductive member, and the connection reliability of the connecting section 232 and the external conductive member 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 the electrode connecting plate 23 and the top cover sheet 1 from each other, avoiding the electrode connecting plate 23 and the top cover sheet 1 from being electrically connected. 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, avoiding 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., prefabricated and molded, and then assembled with the electrode connecting plate 23 and the top cover sheet 1. The platen 22 of the present embodiment may also be an injection molded member. After fixing the relative positions of the electrode connection plate 23 and the top cover sheet 1, the pressing plate 22 is manufactured by an injection molding process.
In one embodiment, the first surface 11 of the coversheet 1 is provided with a recess 11a. The pressing plate 22 is accommodated in the recess 11a. The through hole 13 provided in the top sheet 1 communicates with the recess 11a. When the pressing plate 22 of the present embodiment is a prefabricated member, the pressing plate 22 may be interference-fitted with the recess 11a. 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 to form the pressing plate 22, thereby reducing the processing difficulty. Meanwhile, the connection force between the injection molded pressing plate 22 and the surface of the concave part 11a is stronger, and the connection 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 in the gap formed between two adjacent ribs during injection molding. After the injection molding is completed, the ribs are buried in the pressing plate 22, so that the connection strength between the pressing plate 22 and the top cover sheet 1 is improved.
When the materials of the pressing plate 22 and the top cover sheet 1 in this embodiment are the same insulating material, the joint between the pressing plate 22 and the recess 11a can be connected by welding, so as to improve the connection strength of the two. In one example, where the pressure plate 22 and the top sheet 1 are both plastic, the seam between the pressure plate 22 and the recess 11a may 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 protruding ring body. The ring body encloses the recess 11a.
In one embodiment, as shown in fig. 4, the connection section 232 of the electrode connection 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 is connected to the insulating seal ring 21 through the pressing plate 22. The surface of the insulating sealing ring 21 facing the pressure plate 22 is in full contact with the surface of the pressure plate 22 facing the cover sheet 1. The pressure plate 22 completely isolates the connecting section 232 from the top cover sheet 1. Thus, when the top cover sheet 1 is 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 recess 22a and a limiting hole 22b penetrating the recess 22a and extending toward the first surface 11 are disposed on a surface of the pressing plate 22 facing away from the first surface 11. The limiting hole 22b is disposed opposite the through hole 13 so that the collecting section 231 can pass through the limiting hole 22b, the insulating seal 21, and the through hole 13 in this order and pass over the second surface 12 of the cover sheet 1. A part of the connection section 232 is buried in the concave portion 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 being tilted in a direction away from the pressing plate 22. Meanwhile, the connecting section 232 is limited by the concave part 22a and the limiting hole 22b of the pressing plate 22 at the same time, so that the connecting section 232 is prevented from being displaced. In one example, the current collecting section 231 and the connection section 232 of the electrode connection plate 23 are each of a flat plate-like structure and are perpendicular to each other so that the electrode connection plate 23 has an L-shape. The vertical here is not strictly vertical, but the collecting section 231 is substantially 90 ° from the connecting section 232. The electrode connection plate 23 may be manufactured by stamping.
In one embodiment, as shown in fig. 5 and 6, the connection section 232 of the electrode connection plate 23 includes a protrusion 232a protruding from the surface of the pressing plate 22 facing away from the top cover sheet 1. The projection 232a extends away from the first surface 11 of the top sheet 1. The projection 232a is provided with a receiving cavity on the side of the first surface 11 of the cover sheet 1. The electrode connection plate 23 of the present embodiment may be manufactured by a press method. After the blank is punched, the current collecting section 231, the connection section 232, and the protrusion 232a on the connection section 232 are formed. The protrusion 232a of the present embodiment penetrates from the surface of the pressing plate 22 facing the first surface 11 of the top cover sheet 1, and penetrates from the surface of the pressing plate 22 facing away from the first surface 11 of the top cover sheet 1. The pressing plate 22 can restrict the movement of the connection section 232 in the direction parallel to the top cover sheet 1, improving the connection stability of the electrode connection plate 23. The parallelism here is not strictly parallel, but the moving direction of the connecting section 232 is substantially parallel to the extending direction of the roof sheet 1.
Alternatively, the platen 22 may be a prefabricated member. When the pressing plate 22 is a prefabricated member, the pressing plate 22 includes a plugging hole. The protruding part 232a is inserted into the insertion hole, and the shapes of the protruding part and the insertion hole are matched. The radial dimension of the protruding portion 232a becomes smaller in a direction away from the first surface 11, so that the pressing plate 22 can restrict the movement of the connecting section 232 in a direction away from the top cover 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 232b. The protrusion 232a is connected to the collecting section 231 by a first fold 232b. The first folded edge 232b of the attachment section 232 is attached to the surface of the pressure plate 22 facing the first surface 11 of the top sheet 1. The first folded edge 232b and the protruding portion 232a are configured in a step-shaped structure, so that a part of the pressing plate 22 is in press connection with the first folded edge 232b, limiting is further formed on the connecting section 232 through the first folded edge 232b, buckling deformation or movement of the connecting section 232 in a direction away from the top cover sheet 1 is prevented, and the connecting state of the current collecting section 231 and the electrode assembly is prevented from being influenced due to position displacement of the connecting section 232.
When the insulating sealing ring 21 is sleeved on the current collecting section 231, the first folded edge 232b can limit the insulating sealing ring 21. One part of the insulating sealing ring 21 is in contact with the surface of the pressing plate 22 facing the top sheet 1 and the other part is in contact with the surface of the first folded edge 232b facing the top sheet 1. Thus, the insulating seal 21 is pressed by both the pressing plate 22 and the first folded edge 232b. The part of insulating sealing ring 21 protrusion in the first surface 11 of top cap piece 1 can form the location to connecting segment 232 to form the clearance between messenger's connecting segment 232 and the top cap piece 1, avoid connecting segment 232 and top cap piece 1 contact, on the one hand avoid connecting segment 232 and top cap piece 1 to take place the contact and lead to insulating sealing ring 21 to receive total pressure diminish, and then lead to insulating sealing ring 21 and through-hole 13 between the compressive force diminish, sealing effect between the two diminishes.
Optionally, the connecting section 232 of the electrode connecting plate 23 further comprises a second flange 232c. The first flange 232b and the second flange 232c are disposed on two opposite sides of the protruding portion 232a. The protrusion 232a is connected to the collecting section 231 by a first flange 232b, and a second flange 232c is at the free end. The first and second flanges 232b, 232c are in contact with the surface of the pressure plate 22 facing the top cover sheet 1, respectively. The first folded edge 232b, the protruding portion 232a and the second folded edge 232c are configured to be in a step-shaped structure, so that the portion, surrounding the protruding portion 232a, of the pressing plate 22 is in pressure connection with the first folded edge 232b and the second folded edge 232c, limiting positions of the connection section 232 are further formed through the first folded edge 232b and the second folded edge 232c, the connection section 232 is prevented from buckling, deforming or moving in the direction away from the top cover sheet 1, and the connection state of the current collecting section 231 and the electrode assembly is prevented from being influenced due to position displacement of the connection section 232. When the platen 22 is a prefabricated member, the platen 22 includes a stepped bore. The steps of the stepped holes face towards the top sheet 1. The protruding part 232a is inserted into the hole with smaller radial size in the stepped hole, and the shapes of the protruding part and the stepped hole are matched. The first folded edge 232b and the second folded edge 232c are inserted into a hole with a larger radial size in the stepped hole, and the first folded edge 232b and the second folded edge 232c are in pressure contact with the stepped surface. The pressure plate 22 may also be an injection molded member that forms a unitary structure directly with the connecting section 232.
In one embodiment, the roof sheet 1 of the embodiment of the present invention may be manufactured using an insulating material process. The cover sheet 1 of the present embodiment may be provided with two terminal assemblies 2 of the embodiment of the present invention 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 the present embodiment, since the top sheet 1 itself is insulated, when the electrode connection plates 23 included in the respective terminal assemblies 2 come into contact with the top sheet 1, the electrode connection plates 23 as positive electrodes and the electrode connection plates 23 as negative electrodes do not short-circuit, and safety of the top sheet assembly is improved. The top cover sheet 1 of insulating material is itself lightweight. Alternatively, the roof sheet 1 is manufactured using engineering plastic processing.
The power cell top cap assembly of the embodiment of the present invention includes a top cap sheet 1 and an electrode connection plate 23. The top sheet 1 and the electrode connecting plate 23 may each be manufactured separately and then assembled with each other. Since the electrode connecting plate 23 passes through the top sheet 1, it is necessary to ensure that a sealed state is maintained between the top sheet 1 and the electrode connecting plate 23. The electrode connecting plate 23 and the top cover sheet 1 are in sealing connection through the insulating sealing ring 21. Simultaneously, the pressing plate 22 is arranged to apply compressive stress to the insulating sealing ring 21 so as to press 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 sheet 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 has low assembly difficulty, and the electrode connecting plate 23 and the top cover sheet 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 assembly seals the opening and forms a closed space with the accommodating part of the shell. The second surface 12 of the top sheet 1 is directed towards the receiving part of the casing. The current collecting section 231 of the electrode connection plate 23 extends to the receiving part and is electrically connected to the tab. Since the top cover sheet 1 and the electrode connecting plate 23 in this embodiment maintain a good sealing state, it is ensured that after the top cover sheet 1 is in sealing connection with the casing, the power battery top cover assembly effectively ensures the air tightness of the enclosed space formed by the two, and prevents leakage of substances or gases in the accommodating portion of the casing, for example, electrolyte at the junction of the electrode connecting plate 23 and the top cover sheet 1 or the junction of the top cover sheet 1 and the casing. Thus, the power battery of 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. Adjacent two power cells are electrically connected through a bus bar. One end of the bus bar is welded to the connection section 232 of one of the adjacent two power cells, and the other end is welded to the connection section 232 of the other of the adjacent two power cells. The bus bars and the connecting sections 232 are made of the same metal material, so that the connection rigidity of the bus bars and the connecting sections 232 is improved, and the bus bars and the connecting sections 232 are not easy to separate. The buss bars and the connection sections 232 may each 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 respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (13)
1. A power cell top cap assembly, comprising:
a top sheet (1) comprising 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 pressing plate (22) and an electrode connecting plate (23);
wherein the insulating sealing ring (21) seals the through hole (13), at least one part of the pressing plate (22) is arranged on one side of the top cover sheet (1) away from the second surface (12), and the pressing plate (22) is fixed with the top cover sheet (1) and presses 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, facing away from the first surface (11), of the connecting section (232) is exposed out of the pressing plate (22);
the pressing plate (22) is provided with a concave part (22 a) and a limiting hole (22 b), the concave part (22 a) is arranged on the surface of the pressing plate (22) facing away from the first surface (11), and the limiting hole (22 b) penetrates through the concave part (22 a) and extends towards the direction approaching the first surface (11); the current collecting section (231) sequentially penetrates through the limiting hole (22 b), the insulating sealing ring (21) and the through hole (13), and a part of the connecting section (232) is embedded into the concave part (22 a).
2. The power cell top cover assembly according to claim 1, characterized in that the top cover sheet (1) is an insulating material.
3. The power cell top cover assembly according to claim 1, wherein the connection section (232) is fixedly connected with the pressure plate (22), and the current collecting section (231) passes through the pressure plate (22).
4. The power battery top cover assembly according to claim 1, wherein the insulating sealing ring (21) is inserted into the through hole (13), and the through hole (13) tapers from the first surface (11) to the second surface (12).
5. The power cell top cover assembly according to claim 1, wherein a recess (11 a) is provided on the first surface (11), and the pressing plate (22) is accommodated in the recess (11 a).
6. The power cell top cover assembly according to claim 1, characterized in that a surface of the connection section (232) facing away from the first surface (11) protrudes from a surface of the pressing plate (22) facing away from the first surface (11).
7. The power cell top cover assembly according to any one of claims 1 to 6, wherein the current collecting section (231) and the connecting section (232) are each plate-like in structure and perpendicular to each other.
8. The power cell top cover assembly according to any one of claims 1 to 6, wherein the connection section (232) includes a protrusion (232 a) protruding from the pressing plate (22), the protrusion (232 a) extending away from the first surface (11), and a receiving cavity is provided on a side of the protrusion (232 a) close to the first surface.
9. The power cell top cap assembly according to claim 8, wherein the connection section (232) further includes a first flange (232 b), the protrusion (232 a) is connected to the current collecting section (231) through the first flange (232 b), and the first flange (232 b) is in contact with a surface of the pressing plate facing the top cover sheet.
10. The power cell top cover assembly according to claim 8, wherein the connection section (232) further includes a first flange (232 b) and a second flange (232 c) disposed on opposite sides of the protrusion (232 a), the protrusion (232 a) is connected to the current collecting section (231) through the first flange (232 b), and the first flange (232 b) and the second flange (232 c) are respectively in contact with a surface of the pressing plate (22) facing the top cover sheet (1).
11. The power cell top cover assembly according to claim 10, wherein the first folded edge (232 b) is in contact with the insulating sealing ring (21).
12. A power cell, comprising:
an electrode assembly including a tab;
a case accommodating the electrode assembly, the case having an opening; and
the power cell top cover assembly according to any one of 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 case, and the current collecting section (231) is electrically connected with the tab.
13. A battery module, comprising:
a busbar and two or more power cells as defined in 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.
Priority Applications (1)
| 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 CN113725530A (en) | 2021-11-30 |
| CN113725530B true CN113725530B (en) | 2024-02-23 |
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| CN202110939653.6A Active CN113725531B (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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| 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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| 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 |
|---|---|
| CN113725530A (en) | 2021-11-30 |
| CN109755422A (en) | 2019-05-14 |
| CN113725531A (en) | 2021-11-30 |
| CN113725531B (en) | 2023-11-03 |
| CN109755422B (en) | 2021-09-14 |
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