CN111769249A - Power battery is with plastic part, top cap assembly structure down and power battery - Google Patents
Power battery is with plastic part, top cap assembly structure down and power battery Download PDFInfo
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- CN111769249A CN111769249A CN202010649180.1A CN202010649180A CN111769249A CN 111769249 A CN111769249 A CN 111769249A CN 202010649180 A CN202010649180 A CN 202010649180A CN 111769249 A CN111769249 A CN 111769249A
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- plastic part
- battery
- power battery
- plastic
- top cover
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- 239000004033 plastic Substances 0.000 title claims abstract description 360
- 238000009434 installation Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims description 36
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- 238000003466 welding Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 18
- 238000002844 melting Methods 0.000 description 9
- 239000012943 hotmelt Substances 0.000 description 7
- 239000004734 Polyphenylene sulfide Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 6
- 229920000069 polyphenylene sulfide Polymers 0.000 description 6
- 230000008018 melting Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 238000002604 ultrasonography Methods 0.000 description 1
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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
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- 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)
- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention belongs to the technical field of batteries, and particularly relates to a lower plastic part for a power battery, which comprises a first plastic part (1) and a second plastic part, wherein the first plastic part is used for separating a battery cell (9) and a top cover plate (8); the second plastic part (2) is connected with the first plastic part (1); the lower plastic part has an installation state and a pre-installation state, wherein when the lower plastic part is in the installation state, the second plastic part (2) moves to the same-direction position of the first plastic part (1). The invention can simplify the assembly steps, is beneficial to reducing the manufacturing cost, can also reduce the overall dimension error and improves the overall assembly effect of the battery. In addition, the invention also discloses a top cover assembly structure and a power battery.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a lower plastic part for a power battery, a top cover assembly structure and the power battery.
Background
Power battery generally includes plastic isotructure under top cap, electric core, casing, the top cap, and electric core fixes in the casing, and electric core top is stretched out and is had pole piece and top cap on fixed utmost point post be connected, and the plastic is installed in the top cap below under the top cap, separates top cap and electric core insulation through the plastic under the top cap. Or during assembly, after the positive electrode lug and the negative electrode lug are welded with the pole, the battery core is arranged in the shell, and the battery top cover is installed. In order to prevent the contact between the battery cell and the pole, a certain safety distance is reserved between the battery cell and the pole by using the pole lug cushion plate.
However, due to the addition of the tab backing plate, corresponding manufacturing processes and assembling steps are required to be added; on one hand, the processing and assembling process is more complex, and the pole lug cushion plate is easy to be neglected in the assembling process; on the other hand, the error of the manufacturing process of the tab backing plate and the assembly error between the tab backing plate and the lower plastic easily influence the assembly effect.
Disclosure of Invention
One of the objects of the present invention is: the power battery is with plastic part down is provided to the not enough to prior art, can simplify the assembly procedure, helps reducing manufacturing cost, can also reduce whole dimensional error, improves the whole assembly effect of battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
a lower plastic part for a power battery comprises:
the first plastic part is used for separating the battery cell from the top cover plate;
the second plastic part is connected with the first plastic part;
the lower plastic part is provided with an installation state and a pre-installation state, wherein when the lower plastic part is in the installation state, the second plastic part moves to the position of the same direction as the first plastic part.
As an improvement of the power battery lower plastic part, the first plastic part and the second plastic part are of an integrally formed structure.
As an improvement of the power battery lower plastic part, at least one end of the first plastic part extends outwards to form the second plastic part.
As an improvement of the power battery lower plastic part, the first plastic part extends outwards at any position between two end parts to form the second plastic part.
As an improvement of the power battery lower plastic part, the first plastic part is hinged, riveted or ultrasonically connected with one end of the second plastic part.
As an improvement of the power battery lower plastic part, the second plastic part is fixedly connected with the first plastic part after being turned over, and the fixed connection mode includes at least one of the following modes: clamping, bonding, heat welding and ultrasonic connection.
As an improvement of the power battery lower plastic part, at least one of the first plastic part and the second plastic part is provided with a clamping part and/or a buckling part, and the first plastic part is connected with the second plastic part in a buckling manner.
As an improvement of the power battery lower plastic part, at least one of the first plastic part and the second plastic part is provided with an adhesive layer and/or an adhesive surface, and the first plastic part is adhered to the second plastic part.
As an improvement of the power battery lower plastic part, at least one of the first plastic part and the second plastic part is provided with a hot melting column and/or a hot melting groove, and the first plastic part and the second plastic part are thermally welded.
As an improvement of the power battery lower plastic part, a bending portion is disposed between the first plastic part and the second plastic part, the second plastic part can be folded toward the first plastic part along the bending portion, and the bending portion is completely disconnected or at least connected at one position after the second plastic part is folded.
As an improvement of the power battery lower plastic part of the present invention, the thickness of the bending portion is smaller than the thickness of the first plastic part or the thickness of the second plastic part.
As an improvement of the power battery lower plastic part, the bent portion is provided with at least one of a breaking line, a breaking groove and a breaking hole, and the bent portion is connected or disconnected after the second plastic part is folded.
As an improvement of the power battery lower plastic part, the second plastic part is provided with inclined planes which are inclined upwards along the edges of the front side and the rear side, and the inclined planes are planes or convex lower curved surfaces.
As an improvement of the lower plastic part for the power battery, the upper side edge and the lower side edge of the inclined plane at two sides of the second plastic part are provided with rounded corners.
As an improvement of the power battery lower plastic part, the first plastic part is broken into two parts along the middle part, and at least one end part of each part extends outwards to form the second plastic part.
As an improvement of the power battery lower plastic part, the first plastic part is provided with an explosion-proof valve air hole corresponding to the explosion-proof valve, and/or the second plastic part is provided with an explosion-proof valve air hole corresponding to the explosion-proof valve.
As an improvement of the lower plastic part for the power battery, the ratio of the contact area of the second plastic part and the top surface of the battery cell to the total area of the top surface of the battery cell is greater than 50%.
As an improvement of the power battery lower plastic part, at least one of the first plastic part and the second plastic part is made of PPS and/or PP.
The invention also provides a top cover assembly structure, which comprises a top cover plate and the lower plastic part, wherein the lower plastic part is arranged at the bottom of the top cover plate.
As an improvement of the top cover assembly structure, the top cover sheet is provided with a liquid injection port, the second plastic piece is provided with a liquid injection net, the liquid injection net at least covers a vertical projection surface of the liquid injection port, and the area of a mesh hole of the liquid injection net is smaller than that of the liquid injection port.
As an improvement of the top cover assembly structure, a boss extends from the lower surface of the liquid injection port, a protection bulge is correspondingly arranged on the liquid injection net, and the radius of the protection bulge is larger than that of the boss.
As an improvement of the top cover assembly structure of the present invention, the protection protrusion is provided with a plurality of overflow grooves.
As an improvement of the top cover assembly structure of the present invention, at least one of the top cover sheet and the first plastic part is provided with a heat-melting column and/or a heat-melting slot, and the top cover sheet and the first plastic part are thermally welded.
The invention also provides a power battery, which comprises an electric core, a battery shell for accommodating the electric core, and a top cover plate hermetically mounted on the battery shell, wherein the lower plastic part is arranged between the electric core and the top cover plate, and a tab of the electric core is fixed between the first plastic part and the second plastic part.
The battery has the beneficial effects that the battery comprises a first plastic part used for separating a battery cell and a top cover plate; the second plastic part is connected with the first plastic part; the lower plastic part is provided with an installation state and a pre-installation state, wherein when the lower plastic part is in the installation state, the second plastic part moves to the position of the same direction as the first plastic part. Because the tab backing plate is additionally arranged between the conventional battery cell and the top cover, the corresponding manufacturing process and assembly steps are increased; on one hand, the processing and assembling process is more complex, and the pole lug cushion plate is easy to be neglected in the assembling process; on the other hand, the error of utmost point ear backing plate manufacture process, and with the assembly error between the plastic down, influence the assembly effect easily, therefore, rotate second plastic part and first plastic part and be connected, and the second plastic part can overturn relatively first plastic part, make first plastic part and second plastic part adopt the integral type design, be equivalent to single part, and lower plastic part has installation status and preinstallation status, second plastic part 2 moves to 1 syntropy position department of first plastic part, not only assembly error is less, and be convenient for to first plastic part and second plastic part installation location, and saved installation utmost point ear backing plate, simplify the assembly step, avoid taking place the condition of neglected loading in the assembling process, help simplifying production technology, thereby reduce manufacturing cost. The invention can simplify the assembly steps, is beneficial to reducing the manufacturing cost, can also reduce the overall dimension error and improves the overall assembly effect of the battery.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural view of the first embodiment of the present invention before bending.
Fig. 3 is a schematic structural view after bending according to an embodiment of the present invention.
Fig. 4 is a schematic structural view illustrating a second plastic part formed at one end of a first plastic part according to a sixth embodiment of the present invention.
Fig. 5 is a schematic structural view illustrating a first plastic part and a second plastic part hinged to each other according to an eighth embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a ninth embodiment of the present invention.
Fig. 7 is a schematic cross-sectional view of a ninth embodiment of the present invention.
Fig. 8 is an enlarged view of fig. 7 at a.
FIG. 9 is a schematic structural diagram of a tenth embodiment of the present invention
Wherein: 1-a first plastic part; 2-a second plastic part; 21-liquid injection net; 211-protective protrusions; 2111-an overflow tank; 31-a card portion; 32-a buckle portion; 4-bending part; 5-inclined plane; 6-rounding off; 7-air holes of an explosion-proof valve; 8-top cover sheet; 81-liquid injection port; 811-boss; 9-electric core; z-up and down direction; x-left and right direction; y-the front-back direction.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to fig. 1 to 9, but the present invention is not limited thereto.
Implementation mode one
A lower plastic part for a power battery comprises:
the first plastic part 1 is used for separating the battery cell 9 from the top cover plate 8;
the second plastic part 2 is connected with the first plastic part 1;
wherein, lower plastic part has installation state and preinstallation state, wherein, when being in the installation state, second plastic part 2 moves to first plastic part 1 syntropy position department.
Because the tab backing plate is additionally arranged between the conventional battery cell and the top cover, the corresponding manufacturing process and assembly steps are increased; on one hand, the processing and assembling process is more complex, and the pole lug cushion plate is easy to be neglected in the assembling process; on the other hand, the error of utmost point ear backing plate manufacturing process, and with the assembly error between the plastic down, influence the assembly effect easily, therefore, refer to fig. 1 ~ 3, rotate second plastic part 2 and first plastic part 1 and be connected, make first plastic part 1 and second plastic part 2 adopt the integral type design, be equivalent to single part, and the plastic part has the mounted state and installs the state in advance down, second plastic part 2 moves to first plastic part 1 syntropy position department, not only assembly error is less, and be convenient for to first plastic part 1 and second plastic part 2 installation location, and the utmost point ear backing plate of installation has been saved, simplify the assembly step, avoid taking place the condition of neglected loading in the assembling process, help simplifying production technology, thereby reduce manufacturing cost. The pre-assembly state includes, but is not limited to, the lower plastic part being in an unfolded state, and also includes a state in which an arbitrary angle other than zero degrees can be formed between the first plastic part 1 and the second plastic part 2.
Referring to fig. 1 to 3, in the present embodiment, the battery has two terminals for outputting electric energy to the outside, which are respectively a first terminal and a second terminal, and are disposed on the top cover plate 8, the first terminal can be a positive terminal or a negative terminal, correspondingly, the second terminal can be a negative terminal or a positive terminal, the first plastic part 1 is provided with through holes corresponding to the first terminal and the second terminal of the top cover plate 8, the battery cell 9 in the battery is connected with a first tab and a second tab, the first tab is connected with the first terminal by laser welding, the second tab is connected with the second terminal, wherein, the positive plate, the diaphragm and the negative plate in the battery cell 9 can be stacked and wound in sequence, the positive plate comprises a positive current collector, and the cathode sheet comprises a cathode current collector and a cathode active material coated on the surface of the cathode current collector. First utmost point ear is connected in the anodal mass flow body, and the second utmost point ear is connected in the negative pole mass flow body, and the edge of the anodal mass flow body can have the blank area that is not covered by anodal active material, and first utmost point ear can be directly formed through cutting the blank area. Similarly, the second tab can be directly cut through the blank area of the negative current collector, and in addition, the first tab and the second tab can also be fixed on the blank area of the positive plate and the negative plate respectively through welding.
The first plastic part 1 and the second plastic part 2 are of an integrated structure, and at least one end of the first plastic part 1 extends outwards to form the second plastic part 2. Specifically, referring to fig. 1 ~ 3, first plastic part 1 both ends outwards extend and form second plastic part 2, and first plastic part 1 adopts the integrated into one piece structure with second plastic part 2, not only can improve down the holistic rigidity of plastic part, can also simplify manufacturing process, and reduction in production cost still helps controlling size error, improves the accuracy of the location of first plastic part 1 and second plastic part 2.
At least one of the first plastic part 1 and the second plastic part 2 is provided with a clamping part 31 and/or a buckling part 32, and the first plastic part 1 is connected with the second plastic part 2 in a buckling manner. Specifically, the second plastic part 2 is provided with a buckling part 32, the first plastic part 1 is provided with a clamping part 31, the buckling part 32 is matched with the clamping part 31, and the second plastic part 2 is fixed to the first plastic part 1 without occupying the internal space of the battery, so that more space is reserved for an electrode assembly, and the energy density of the battery is improved; the radius of the buckling part 32 is larger than that of the clamping part 31, so that the buckling part 32 is fixed in the clamping part 31, the buckling part 32 can be designed to comprise two half tenons with the middle separated, and a certain gap is reserved between the two half tenons, so that when the buckling part 32 is inserted into the clamping part 31, the two half tenons stretch in the directions of each other, and the clamping part 31 is convenient to insert. The buckling part 32 may be in other shapes with two thin ends and a thicker middle part, and may be fixed in the clamping part 31, but the invention is not limited thereto, the first plastic part 1 may be provided with the buckling part 32, the second plastic part 2 may be provided with the clamping part 31, in addition, the first plastic part 1 may be provided with the buckling part 32 and the clamping part 31, correspondingly, the second plastic part 2 may be provided with the clamping part 31 and the buckling part 32, so as to improve the stability between the first plastic part 1 and the second plastic part 2, realize that after the assembly, the relative position relationship between the first plastic part 1 and the second plastic part 2 is maintained, and improve the stability of the battery assembly. However, the present invention is not limited thereto, and when assembling the battery, the arrangement of each component in the housing of the battery with different types or different sizes may be different, the second plastic part 2 is fixedly connected to the first plastic part 1 after being turned over, and the fixing connection manner further includes bonding, thermal welding and ultrasonic connection.
Be provided with kink 4 between first plastic part 1 and the second plastic part 2, second plastic part 2 can be followed kink 4 and folded to first plastic part 1, and kink 4 breaks off completely or at least one department is connected after second plastic part 2 is folded. Increase kink 4 for first plastic part 1 and second plastic part 2 can buckle at kink 4, according to the actual production demand, can design into the partial disconnection of bending back to the structure of kink 4, the location and the connection of first plastic part 1 and second plastic part 2 of being convenient for, also can design into the whole disconnection of back of buckling to the structure of kink 4, can reduce the size tolerance and add up, prevent down that plastic part takes place to warp.
The second plastic part 2 is provided with inclined planes 5 which incline upwards along the edges of the front side and the rear side, and the inclined planes 5 are planes or convex lower curved surfaces. Specifically, second plastic part 2 is provided with inclined plane 5 of ascending slope along fore-and-aft direction Y both sides edge, can further avoid in the assembling process to buckle the utmost point ear of electric core 9, and inclined plane 5 is plane or lower convex surface, preferably lower convex surface, can avoid utmost point ear to buckle at the corner of second plastic part 2 and cause stress concentration, or the condition of pole piece is punctured to marginal closed angle, in addition, inclined plane 5 can reduce the wearing and tearing to the utmost point ear of electric core 9, further improvement secondary battery's performance, extension secondary battery's life.
And the upper and lower edges of the inclined planes on the two sides of the second plastic part 2 are provided with fillets 6. Specifically, along upper and lower direction Z, the inclined plane upper and lower side reason of 2 both sides of second plastic part is provided with radius angle 6, and radius angle 6 can reduce and fold the pole piece in the assembling process, avoids taking place conditions such as stress concentration, edge closed angle puncture pole piece.
The first plastic part 1 is provided with an explosion-proof valve air hole 7 corresponding to the explosion-proof valve, and/or the second plastic part 2 is provided with an explosion-proof valve air hole 7 corresponding to the explosion-proof valve. The explosion-proof valve can automatically and quickly release the pressure of the battery when the battery rises due to overcharge, overdischarge, overcurrent and short circuit inside the battery, so that safety accidents caused by explosion of the battery are avoided. Explosion-proof valve bleeder vent 7 can ensure that the interior pressure of battery can in time carry out the pressure release through explosion-proof valve, ensure that explosion-proof valve can normal use, explosion-proof valve bleeder vent 7 is including but not limited to setting up at first plastic part 1 or second plastic part 2, first plastic part 1 and second plastic part 2 all can set up explosion-proof valve bleeder vent 7 with the position that explosion-proof valve corresponds, make the gas that produces in the battery can be very easy explosion-proof valve department of reacing, reduce the probability of danger, explosion-proof valve bleeder vent 7's shape can be circular can also be oval wait shape, in addition, first plastic part 1 still can set up and annotate the notes liquid through-hole that liquid mouth 81 matches, guarantee to annotate liquid efficiency. Explosion-proof valve bleeder vent 7 can have the punch combination of multiple shapes such as triangle-shaped hole, circular port, quad slit to constitute, a plurality of holes can be arranged according to certain rule, form gas passage, preferably adopt a plurality of circular ports to constitute, when secondary battery takes place the thermal runaway, can guarantee the effect of ventilating, can prevent again that the fixed granule of high temperature from passing through the mesh, thereby prevent that other and high temperature solid-state granule of flammability from spouting the explosion-proof valve outward and air hybrid combustion together, thereby show improvement battery security performance.
After the battery assembly is completed, in the using process, the battery cell 9 in the battery is easy to shake. If the battery applied to the electric automobile is used, the battery cell 9 in the battery is easy to shake due to the shake of the automobile in the traveling process, and in order to solve the problem, the ratio of the contact area between the second plastic part 2 and the top surface of the battery cell 9 to the total area of the top surface of the battery cell 9 is set to be more than 50%. One side of second plastic part 2 and the contact of electric core 9 top surface is planar structure, if the area undersize of the contact of second plastic part 2 and electric core 9 top surface, cause electric core 9 to rock easily, the part of the contact of second plastic part 2 and electric core 9 top surface can play spacing effect to electric core 9, the condition that electric core 9 appears rocking easily in having realized reducing the battery, so, be greater than 50% with the area of the contact of second plastic part 2 and electric core 9 top surface and the total area of electric core 9 top surface than, preferably 60%, 65%, 70%, 75%, 80%, 85% and above.
At least one of the first plastic part 1 and the second plastic part 2 is made of PPS and/or PP. The first plastic part 1 and the second plastic part 2 are made of different materials, specifically, the first plastic part 1 is made of PPS (polyphenylene sulfide), and the second plastic part 2 is made of PP (polypropylene); the first plastic part 1 can also be made of PP (polypropylene) and the second plastic part 2 can be made of PPS (polyphenylene sulfide), so that the situation that the plastic parts are easy to bend and deform when the same materials are used is prevented.
Second embodiment
The difference from the first embodiment is that: the first plastic part 1 of the present embodiment extends outward at any one position between both end portions thereof to form a second plastic part 2. Any position between two ends of the first plastic part 1 can extend outwards to form a second plastic part 2, and the second plastic part 2 is ensured to be rotationally connected with the first plastic part 1.
Other structures are the same as those of the first embodiment, and are not described herein again.
Third embodiment
The difference from the first embodiment is that: at least one of the first plastic part 1 and the second plastic part 2 of the present embodiment is provided with an adhesive layer and/or an adhesive surface, and the first plastic part 1 is adhered to the second plastic part 2. Specifically, on the contact surface after first plastic part 1 and second plastic part 2 are folded, be equipped with stickers such as layer, gluing layer at first plastic part 1 or second plastic part 2, through the connected mode that bonds, be in the same place first plastic part 1 and second plastic part are fixed, realized after the assembly, keep the relative position relation of first plastic part 1 and second plastic part 2, improved the effect of the stability of battery assembly.
Other structures are the same as those of the first embodiment, and are not described herein again.
Embodiment IV
The difference from the first embodiment is that: at least one of the first plastic part 1 and the second plastic part 2 of the present embodiment is provided with a heat-melting column and/or a heat-melting groove, and the first plastic part 1 and the second plastic part 2 are heat-welded. Concretely, set up at least one hot melt post on first plastic part 1 or second plastic part 2, the position that first plastic part 1 or second plastic part 2 correspond sets up the hot melt groove, through hot melt connected mode, be in the same place first plastic part 1 and second plastic part are fixed, the realization is after the assembly, keep the relative position relation of first plastic part 1 and second plastic part 2, the effect of the stability of battery assembly has been improved, still can not occupy the inner space of battery, thereby reserve more spaces of electrode subassembly, improve the energy density of battery.
Other structures are the same as those of the first embodiment, and are not described herein again.
Fifth embodiment
The difference from the first embodiment is that: the thickness of the bending portion 4 of the present embodiment is smaller than the thickness of the first plastic part 1 or the thickness of the second plastic part 2, the bending portion 4 is provided with at least one of a breaking line, a breaking groove and a breaking hole, and the bending portion 4 is connected or disconnected after the second plastic part 2 is folded. Because the thickness of the bending part 4 is smaller, the bending part can be bent more easily, preferably, the thickness of the bending part 4 is 2-5mm, the bending part 4 can also be disconnected in the form of arranging a fracture line, a breaking groove and a breaking hole, when the bending part 4 is disconnected, at least one part of the bending part 4 is not disconnected, namely, the second plastic part 2 is not disconnected completely after being bent; in addition, the thickness of the bending part 4 is smaller than the thickness of the first plastic part 1 or the thickness of the second plastic part 2, and the bending part 4 can be disconnected.
Alternatively, the bending portion 4 may be configured to be broken, that is, the second plastic part 2 is broken after being bent toward the first plastic part 1, so as to avoid the second plastic part 2 from being deformed after the first plastic part 1 and the second plastic part 2 are fixed due to the accumulation of errors between the first plastic part 1 and the second plastic part 2.
Other structures are the same as those of the first embodiment, and are not described herein again.
Sixth embodiment
The difference from the first embodiment is that: referring to fig. 4, one end of the first plastic part 1 extends outward to form a second plastic part 2. When assembling into the battery, only need with a second plastic part 2 toward first plastic part 1 buckle, saved the step of another second plastic part 2 of will buckling, help simplifying production processes to improve production efficiency.
Other structures are the same as those of the first embodiment, and are not described herein again.
Seventh embodiment
The difference from the first embodiment is that: the first plastic part 1 of the present embodiment is broken into two parts along the middle portion, and at least one end of each part extends outward to form the second plastic part 2. Specifically, the first plastic part 1 is broken into two parts along the middle part, that is, the first plastic part 1 is divided into a left part and a right part along the left-right direction X, and the left part and the right part are separated at the explosion-proof valve, one side of the first plastic part 1 of the left part close to the explosion-proof valve extends to form the second plastic part 2, or one side far away from the explosion-proof valve extends to form the second plastic part 2, and meanwhile, the first plastic part 1 of the right part can also form the second plastic part 2 according to the structure; first plastic part 1 breaks into two parts along the middle part for first plastic part 1 and second plastic part 2 do not shelter from explosion-proof valve, consequently need not set up explosion-proof valve bleeder vent 7 on first plastic part 1 and second plastic part 2, and in addition, after first plastic part 1 falls into two parts, can avoid because the error accumulation between first plastic part 1 and the second plastic part 2, lead to that second plastic part 2 takes place to warp after both fix.
Other structures are the same as those of the first embodiment, and are not described herein again.
Embodiment eight
In order to realize a better assembly effect between the first plastic part 1 and the second plastic part 2, one end of the first plastic part 1 is hinged, riveted or ultrasonically connected with one end of the second plastic part 2. Specifically, referring to fig. 5, the first plastic part 1 is hinged to one end of the second plastic part 2, that is, the first plastic part 1 is rotatably connected to the second plastic part 2 through a rotating shaft, the rotating shaft can be independently arranged, the first plastic part 1 and the second plastic part 2 are both provided with rotating shaft holes, the rotating shaft can also be integrally arranged at the end of the first plastic part 1 or the second plastic part 2, the corresponding end of the first plastic part 1 or the second plastic part 2 is provided with the rotating shaft hole, so as to meet the requirement that the first plastic part 1 and the second plastic part 2 are rotatably connected, which is helpful for realizing better rotatable connection between the first plastic part 1 and the second plastic part 2, thereby not only reducing resistance in the rotating process, but also reducing the probability of rebounding of the second plastic part 2 in the using process, one end of the first plastic part 1 and the second plastic part 2 can also be ultrasonically connected, specifically, the first plastic part 1 and the second plastic part 2 are thermally melted into a whole through ultrasound, when the thermally, because of the intensity of hot melt department is lower relatively, bends more easily, and the thickness that is equivalent to junction between them is less, promptly, second plastic part 2 breaks off after buckling to first plastic part 1, can avoid because the error accumulation between first plastic part 1 and second plastic part 2, leads to the condition that second plastic part 2 takes place to warp after both are fixed.
Ninth embodiment
A top cover assembly structure comprises a top cover plate 8 and a lower plastic piece from the first embodiment to the sixth embodiment, wherein the lower plastic piece is arranged at the bottom of the top cover plate 8.
It should be noted that: referring to fig. 6, the utmost point post that the battery is used for exporting electric energy to the outside has two, be first utmost point post respectively, the second utmost point post, all set up on top cap piece 8, first utmost point post can also be the negative pole post for positive post, correspondingly, the second utmost point post is negative pole post or positive post, first utmost point post with top cap piece 8 is seted up to first plastic part 1, the through-hole that the second utmost point post corresponds, first plastic part 1 and second plastic part 2 play the effect of insulating top cap piece 8 and electric core 9, can also prevent that electrolyte from corroding top cap piece 8, help prolonging the life of battery.
Referring to fig. 6 to 8, the top cover sheet 8 is provided with an injection port 81, the second plastic part 2 is provided with an injection net 21, the injection net 21 at least covers the vertical projection surface of the injection port 81, and the area of the mesh of the injection net 21 is smaller than the area of the injection port 81. Annotate liquid net 21 and be equipped with a plurality of mesh, the mesh size is less than annotates the size of liquid mouth 81, annotates liquid net 21 and can be in the formation in-process, prevents to annotate in the glue nail of liquid mouth 81 from annotating liquid mouth 81 and fall into electric core 9, annotates liquid net 21 and at least complete cover annotates liquid mouth 81 below projection surface scope, in addition, first plastic part 1 sets up and annotates the liquid through-hole that annotates that liquid mouth 81 matches, annotates the liquid through-hole and is located annotate liquid net 21 directly over.
The meshes in the liquid injection net 21 can be formed by holes in various shapes such as triangular holes, circular holes and square holes, and the holes can be arranged according to a certain rule to form a gas channel, preferably formed by a plurality of circular holes.
Referring to fig. 8, a boss 811 extends from the lower surface of the liquid inlet 81, and a protection protrusion 211 is correspondingly disposed on the liquid inlet screen 21, wherein the radius of the protection protrusion 211 is larger than that of the boss 811. Annotate liquid mouth 81 below and stretch out and have boss 811, second plastic part 2 is equipped with the protruding 211 of protection that corresponds with boss 811, and the radius of the protruding 211 of protection is greater than boss 811's radius, and protruding 211 cooperation boss 811 of protection can prevent to become the nail from annotating liquid mouth 81 and falling into the clearance between first plastic part 1 and the second plastic part 2, and wherein, boss 811 accessible punching press top cover piece 8's lower surface forms.
Referring to fig. 6, the protection protrusion 211 is provided with a plurality of overflow grooves 2111. In order to ensure the liquid injection efficiency and prevent the blockage of the liquid injection port 81, the protection protrusion 211 is provided with a plurality of overflow grooves 2111, the overflow grooves 2111 ensure that no closed flow channel is formed between the protection protrusion 211 and the boss 811 after the second plastic part 2 is fixed to the first plastic part 1, and electrolyte can flow to the outer side of the protection protrusion 211 from the overflow grooves 2111, so that the liquid injection efficiency is ensured.
At least one of the top cover plate 8 and the first plastic part 1 is provided with a hot melting column and/or a hot melting groove, and the top cover plate 8 and the first plastic part 1 are in hot melting. It is specific, set up at least one hot melt post on top cap piece 8 or first plastic part 1, the position that top cap piece 8 or first plastic part 1 correspond sets up hot melt groove, through hot melt connected mode, be in the same place top cap piece 8 and first plastic part 1 are fixed, help preventing that the plastic from upwarping, still help improving the steadiness between top cap piece 8 and the first plastic part 1, still can not occupy the inner space of battery, thereby reserve more spaces for electrode subassembly, improve the energy density of battery.
Detailed description of the preferred embodiment
Referring to fig. 9, a power battery includes a battery cell 9, a battery case for accommodating the battery cell 9, and a top cover plate 8 hermetically mounted on the battery case, a lower plastic component in one embodiment to a sixth embodiment is disposed between the battery cell 9 and the top cover plate 8, and a tab of the battery cell 9 is fixed between the first plastic component 1 and the second plastic component 2.
When the number of the battery cores 9 in the battery is large or the tabs are short, the adapter plate is used in the assembling process and comprises a first adapter plate and a second adapter plate. The first electrode lug is connected with the first pole column through the first switching piece. The second utmost point ear all is connected with the second utmost point post through the second switching piece, has realized improving the inside orderly connection of battery.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A lower plastic part for a power battery is characterized by comprising:
the first plastic part (1) is used for separating the battery cell (9) and the battery top cover plate (8);
the second plastic part (2) is connected with the first plastic part (1);
the lower plastic part has an installation state and a pre-installation state, wherein when the lower plastic part is in the installation state, the second plastic part (2) moves to the same-direction position of the first plastic part (1).
2. The plastic part for power battery as claimed in claim 1, wherein: at least one end of the first plastic part (1) extends outwards to form the second plastic part (2), or any position between the two ends of the first plastic part (1) extends outwards to form the second plastic part (2).
3. The plastic part for power battery as claimed in claim 1, wherein: the first plastic part (1) is hinged, riveted or ultrasonically connected with one end of the second plastic part (2), the other end of the second plastic part (2) is fixedly connected with the first plastic part (1) after being turned over, and the fixed connection mode comprises at least one of the following modes: clamping, bonding, heat welding and ultrasonic connection.
4. The plastic part for power battery as claimed in claim 1, wherein: first plastic part (1) with be provided with kink (4) between second plastic part (2), second plastic part (2) can be followed kink (4) to first plastic part (1) is folded, kink (4) is in after folding second plastic part (2) complete disconnection or at least one department is connected.
5. The plastic part for power battery as claimed in claim 1, wherein: the second plastic part (2) is provided with inclined planes (5) which incline upwards along the edges of the front side and the rear side, and the inclined planes (5) are planes or convex lower curved surfaces.
6. The plastic part for power battery as claimed in claim 1, wherein: the first plastic part (1) is broken into two parts along the middle part, and at least one end part of each part extends outwards to form the second plastic part (2).
7. The plastic part for power battery as claimed in claim 1, wherein: the ratio of the contact area of the second plastic part (2) and the top surface of the battery cell (9) to the total area of the top surface of the battery cell (9) is more than 50%.
8. The plastic part for power battery as claimed in claim 1, wherein: the material of at least one of the first plastic part (1) and the second plastic part (2) is PPS and/or PP.
9. A top cap assembly structure, its characterized in that: the plastic part comprises a top cover plate (8) and the plastic part according to any one of claims 1 to 8, wherein the plastic part is arranged at the bottom of the top cover plate (8), a liquid injection port (81) is formed in the top cover plate (8), a liquid injection net (21) is arranged on the second plastic part (2), a boss (811) extends from the lower surface of the liquid injection port (81), a protection protrusion (211) is correspondingly arranged on the liquid injection net (21), and a plurality of overflow grooves (2111) are formed in the protection protrusion (211).
10. The utility model provides a power battery, includes electric core (9), holds the battery case of electric core (9), and seal installation in top cap piece (8) on the battery case, its characterized in that: the plastic part is arranged between the battery cell (9) and the top cover plate (8) according to any one of claims 1 to 8, and the pole ear of the battery cell (9) is fixed between the first plastic part (1) and the second plastic part (2).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649180.1A CN111769249A (en) | 2020-07-08 | 2020-07-08 | Power battery is with plastic part, top cap assembly structure down and power battery |
| PCT/CN2021/090160 WO2022007481A1 (en) | 2020-07-08 | 2021-04-27 | Lower plastic member for power battery, top cover assembly structure, and power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649180.1A CN111769249A (en) | 2020-07-08 | 2020-07-08 | Power battery is with plastic part, top cap assembly structure down and power battery |
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| Publication Number | Publication Date |
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| CN111769249A true CN111769249A (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010649180.1A Pending CN111769249A (en) | 2020-07-08 | 2020-07-08 | Power battery is with plastic part, top cap assembly structure down and power battery |
Country Status (2)
| Country | Link |
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| CN (1) | CN111769249A (en) |
| WO (1) | WO2022007481A1 (en) |
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| CN113644356A (en) * | 2021-07-28 | 2021-11-12 | 东莞塔菲尔新能源科技有限公司 | Utmost point ear connection structure and battery of battery top cap |
| WO2022007481A1 (en) * | 2020-07-08 | 2022-01-13 | 东莞塔菲尔新能源科技有限公司 | Lower plastic member for power battery, top cover assembly structure, and power battery |
| CN115863864A (en) * | 2023-02-09 | 2023-03-28 | 深圳海润新能源科技有限公司 | Lower plastic component, energy storage device and electric equipment |
| CN116742284A (en) * | 2023-08-16 | 2023-09-12 | 深圳海辰储能控制技术有限公司 | Energy storage device, power utilization system and energy storage system |
| CN116914384A (en) * | 2023-09-08 | 2023-10-20 | 常州武进中瑞电子科技股份有限公司 | Anti-tilting structure and lithium battery |
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| CN115939692B (en) * | 2023-02-09 | 2023-05-23 | 深圳海润新能源科技有限公司 | Lower plastic assembly, end cover assembly, energy storage device and electric equipment |
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| CN206947388U (en) * | 2017-06-09 | 2018-01-30 | 深圳市瑞德丰精密制造有限公司 | Plastic cement and rack integral structure under battery cover board |
| CN207587780U (en) * | 2017-12-14 | 2018-07-06 | 合肥国轩高科动力能源有限公司 | Stop frame mounting structure above and below a kind of battery cover board |
| CN208368552U (en) * | 2018-06-11 | 2019-01-11 | 合肥力翔电池科技有限责任公司 | A kind of upper and lower stop frame of ternary VDA battery |
| CN209947888U (en) * | 2019-04-03 | 2020-01-14 | 合肥国轩高科动力能源有限公司 | Overturning type stopping frame for power battery cover plate |
| CN209896110U (en) * | 2019-06-04 | 2020-01-03 | 安徽益佳通电池有限公司 | Battery cover plate assembly |
| CN111769249A (en) * | 2020-07-08 | 2020-10-13 | 江苏塔菲尔新能源科技股份有限公司 | Power battery is with plastic part, top cap assembly structure down and power battery |
| CN212695201U (en) * | 2020-07-08 | 2021-03-12 | 江苏塔菲尔新能源科技股份有限公司 | Power battery top cover assembly structure and power battery |
| CN212874612U (en) * | 2020-08-13 | 2021-04-02 | 江苏塔菲尔新能源科技股份有限公司 | Plastic part, power battery top cap and power battery that power battery used |
| CN112018278A (en) * | 2020-09-22 | 2020-12-01 | 深圳市科达利实业股份有限公司 | Battery top cap and power battery |
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2020
- 2020-07-08 CN CN202010649180.1A patent/CN111769249A/en active Pending
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2021
- 2021-04-27 WO PCT/CN2021/090160 patent/WO2022007481A1/en active Application Filing
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| WO2022007481A1 (en) * | 2020-07-08 | 2022-01-13 | 东莞塔菲尔新能源科技有限公司 | Lower plastic member for power battery, top cover assembly structure, and power battery |
| CN113644356A (en) * | 2021-07-28 | 2021-11-12 | 东莞塔菲尔新能源科技有限公司 | Utmost point ear connection structure and battery of battery top cap |
| CN115863864A (en) * | 2023-02-09 | 2023-03-28 | 深圳海润新能源科技有限公司 | Lower plastic component, energy storage device and electric equipment |
| US11984624B1 (en) | 2023-02-09 | 2024-05-14 | Shenzhen Hithium Energy Storage Technology Co., Ltd. | Lower plastic assembly, energy storage apparatus, and electric device |
| CN116742284A (en) * | 2023-08-16 | 2023-09-12 | 深圳海辰储能控制技术有限公司 | Energy storage device, power utilization system and energy storage system |
| CN116742284B (en) * | 2023-08-16 | 2023-10-31 | 深圳海辰储能控制技术有限公司 | Energy storage device, power utilization system and energy storage system |
| CN116914384A (en) * | 2023-09-08 | 2023-10-20 | 常州武进中瑞电子科技股份有限公司 | Anti-tilting structure and lithium battery |
| CN116914384B (en) * | 2023-09-08 | 2024-04-19 | 常州武进中瑞电子科技股份有限公司 | Anti-tilting structure and lithium battery |
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Effective date of registration: 20220113 Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant after: Jiangsu Zhengli new energy battery technology Co.,Ltd. Address before: 211100 Lantian Road 249, Airport Economic Development Zone, Jiangning District, Nanjing City, Jiangsu Province Applicant before: JIANGSU TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: DONGGUAN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: SHENZHEN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. |
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