WO2022007481A1 - Lower plastic member for power battery, top cover assembly structure, and power battery - Google Patents

Lower plastic member for power battery, top cover assembly structure, and power battery Download PDF

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Publication number
WO2022007481A1
WO2022007481A1 PCT/CN2021/090160 CN2021090160W WO2022007481A1 WO 2022007481 A1 WO2022007481 A1 WO 2022007481A1 CN 2021090160 W CN2021090160 W CN 2021090160W WO 2022007481 A1 WO2022007481 A1 WO 2022007481A1
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WO
WIPO (PCT)
Prior art keywords
plastic part
top cover
power battery
battery
plastic
Prior art date
Application number
PCT/CN2021/090160
Other languages
French (fr)
Chinese (zh)
Inventor
李勇军
马坤
张瑞朋
焦叶辉
Original Assignee
东莞塔菲尔新能源科技有限公司
江苏塔菲尔新能源科技股份有限公司
江苏塔菲尔动力系统有限公司
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Application filed by 东莞塔菲尔新能源科技有限公司, 江苏塔菲尔新能源科技股份有限公司, 江苏塔菲尔动力系统有限公司 filed Critical 东莞塔菲尔新能源科技有限公司
Publication of WO2022007481A1 publication Critical patent/WO2022007481A1/en

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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

Definitions

  • the invention belongs to the technical field of batteries, and in particular relates to a lower plastic part for a power battery, a top cover assembly structure and a power battery.
  • the power battery generally includes structures such as a top cover, a cell, a shell, and a plastic under the top cover.
  • the cell is fixed in the shell, and a pole piece protrudes from the top of the cell to connect with the fixed pole on the top cover, and the plastic is installed under the top cover.
  • Under the top cover the top cover is insulated from the cell by the plastic under the top cover.
  • the positive electrode tab and the negative electrode tab are welded to the pole first, and then the battery core is placed in the casing, and the battery top cover is installed.
  • a tab pad is used so that there is a certain safety distance between the cell and the pole.
  • One of the objectives of the present invention is to provide a lower plastic part for a power battery in view of the deficiencies of the prior art, which can simplify assembly steps, help reduce manufacturing costs, reduce overall dimensional errors, and improve the overall assembly effect of the battery.
  • a lower plastic part for a power battery comprising:
  • the first plastic part is used to separate the battery cells and the top cover sheet
  • the lower plastic part has an installed state and a pre-installed state, wherein when in the installed state, the second plastic part moves to the same position of the first plastic part.
  • the first plastic part and the second plastic part are integrally formed.
  • At least one end of the first plastic part extends outward to form the second plastic part.
  • the first plastic part extends outwardly from any place between its two ends to form the second plastic part.
  • the first plastic part is hinged, riveted or ultrasonically connected to one end of the second plastic part.
  • the second plastic part is fixedly connected to the first plastic part after being turned over, and the fixed connection method includes at least one of the following: clamping, sticking welding, thermal welding and ultrasonic bonding.
  • At least one of the first plastic part and the second plastic part is provided with a clip part and/or a buckle part, and the first plastic part is The piece is snap-connected with the second plastic piece.
  • 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 and the second plastic part are provided with an adhesive layer and/or an adhesive surface.
  • a plastic part is bonded to the second plastic part.
  • At least one of the first plastic part and the second plastic part is provided with a hot-melt column and/or a hot-melt groove, and the first plastic part and the second plastic part are provided with a hot-melt column and/or a hot-melt groove.
  • a plastic part is thermally welded to the second plastic part.
  • a bending part is provided between the first plastic part and the second plastic part, and the second plastic part can be The bending part is folded toward the first plastic part, and the bending part is completely disconnected or connected at least in one place after the second plastic part is folded.
  • the thickness of the bending part is smaller than the thickness of the first plastic part or the thickness of the second plastic part.
  • the bending part is provided with at least one of a breaking line, a breaking groove and a breaking hole;
  • the second plastic part is connected or disconnected after being folded.
  • the second plastic part is provided with an upwardly inclined inclined surface along the front and rear edges, and the inclined surface is a plane or a downwardly convex curved surface.
  • rounded corners are provided on the upper and lower edges of the sloped upper and lower sides of the second plastic part.
  • the first plastic part is divided into two parts along the middle part, and at least one end of each part extends outward to form the second plastic part.
  • the first plastic part is provided with an explosion-proof valve ventilation hole corresponding to the explosion-proof valve
  • the second plastic part is provided with an explosion-proof valve corresponding to the explosion-proof valve.
  • the ratio of the contact area between the second plastic part and the top surface of the battery cell to the total area of the top surface of the battery core is greater than 50 %.
  • At least one of the first plastic part and the second plastic part is made of PPS and/or PP.
  • the second objective of the present invention is to provide a top cover assembly structure, which includes a top cover sheet and the above-mentioned lower plastic part, wherein the lower plastic part is arranged at the bottom of the top cover sheet.
  • the top cover sheet is provided with a liquid injection port
  • the second plastic part is provided with a liquid injection net
  • the liquid injection net at least covers the liquid injection port , the area of the mesh of the liquid injection net is smaller than the area of the liquid injection port.
  • a boss extends from the lower surface of the liquid injection port, and a protection protrusion is correspondingly provided on the liquid injection net, and the radius of the protection protrusion is larger than the radius of the protection protrusion. Boss radius.
  • the protective protrusion is provided with a plurality of overflow grooves.
  • At least one of the top cover sheet and the first plastic part is provided with a hot melt column and/or a hot melt groove, and the top cover sheet and the The first plastic part is thermally welded.
  • the third object of the present invention is to provide a power battery, including a battery cell, a battery case for accommodating the battery cell, and a top cover sheet sealingly mounted on the battery case, the battery cell and the top cover
  • the lower plastic part is arranged between the cover sheets, and the tabs of the battery core are fixed between the first plastic part and the second plastic part.
  • the beneficial effect of the present invention is that the present invention includes a first plastic part for separating the battery cells and the top cover sheet; and a second plastic part, which is connected with the first plastic part; wherein, the lower plastic part has an installation The state and the pre-installed state, wherein, when in the installed state, the second plastic part moves to the same position as the first plastic part. Since a tab pad is added between the existing battery cell and the top cover, the corresponding manufacturing process and assembly steps are added; on the one hand, the processing and assembly processes are more complicated, and the tab pad is easily caused during the assembly process. Missing assembly; on the other hand, the error in the manufacturing process of the tab pad and the assembly error with the lower plastic can easily affect the assembly effect.
  • the second plastic part is rotated and connected to the first
  • the first plastic part can be turned over relative to the first plastic part, so that the first plastic part and the second plastic part adopt an integrated design, which is equivalent to a single part, and the lower plastic part has an installed state and a pre-installed state, and the second plastic part 2 moves to the first
  • a plastic part 1 is located in the same direction, not only the assembly error is small, but also the installation and positioning of the first plastic part and the second plastic part is convenient, and the installation of the tab pad is omitted, which simplifies the assembly steps and avoids the occurrence of accidents during the assembly process.
  • the case of missing packaging helps to simplify the production process, thereby reducing the manufacturing cost.
  • the invention can simplify assembly steps, help reduce manufacturing cost, reduce overall size error, and improve the overall assembly effect of the battery.
  • FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of Embodiment 1 of the present invention before bending.
  • FIG. 3 is a schematic diagram of the structure after bending according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural diagram of a second plastic part formed at one end of the first plastic part according to Embodiment 6 of the present invention.
  • FIG. 5 is a schematic structural diagram of the first plastic part and the second plastic part in the eighth embodiment of the present invention when they are hinged.
  • FIG. 6 is a schematic structural diagram of Embodiment 9 of the present invention.
  • FIG. 7 is a schematic cross-sectional structure diagram of Embodiment 9 of the present invention.
  • FIG. 8 is an enlarged view of part A of FIG. 7 .
  • FIG. 9 is a schematic structural diagram of Embodiment 10 of the present invention.
  • 1-first plastic part 2-second plastic part; 21-liquid injection net; 211-protection protrusion; 2111-overflow groove; 31-clamp part; 32-buckle part; 4-bending part; 5-inclined surface; 6-rounded corner; 7-explosion-proof valve ventilation hole; 8-top cover sheet; 81-liquid injection port; 811-boss; 9-battery core; Z-up and down direction; X-left and right direction; Y - Front and rear direction.
  • the terms “installation”, “connection”, “connection”, “fixation” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two components.
  • installation e.g., it may be a fixed connection or a detachable connection, Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two components.
  • a lower plastic part for a power battery comprising:
  • the first plastic part 1 is used to separate the battery cells 9 and the top cover sheet 8;
  • the second plastic part 2 is connected with the first plastic part 1;
  • the lower plastic part has an installed state and a pre-installed state, wherein when in the installed state, the second plastic part 2 moves to the same position as the first plastic part 1 .
  • the second plastic part 2 and the first plastic part are connected 1. Rotate connection, so that the first plastic part 1 and the second plastic part 2 adopt an integrated design, which is equivalent to a single part, and the lower plastic part has an installed state and a pre-installed state, and the second plastic part 2 moves to the first plastic part 1.
  • the pre-installed state includes but is not limited to a state where the lower plastic part is unfolded, and also includes a state in which any angle other than zero degrees can be formed between the first plastic part 1 and the second plastic part 2 .
  • the battery has two poles for outputting electrical energy to the outside, namely a first pole and a second pole, which are both disposed on the top cover 8 , and the first pole
  • the column can be either a positive pole or a negative pole.
  • the second pole is a negative pole or a positive pole
  • the first plastic part 1 is provided with a connection corresponding to the first pole and the second pole of the top cover sheet 8 .
  • the cell 9 in the battery is connected with a first tab and a second tab, and the first tab and the first pole are connected by laser welding, and the second tab is connected with the second pole, wherein , the positive electrode sheet, separator and negative electrode sheet in the battery core 9 can be stacked and wound in sequence, the positive electrode sheet includes a positive electrode current collector, and the positive electrode active material coated on the surface of the positive electrode current collector, the negative electrode sheet includes a negative electrode current collector, and the coating The negative electrode active material on the surface of the negative electrode current collector.
  • the first tab is connected to the positive electrode current collector
  • the second tab is connected to the negative electrode current collector
  • the edge of the positive electrode current collector may have a blank area not covered by the positive active material
  • the first tab can be directly formed by cutting the blank area .
  • the second tab can be directly cut through the blank area of the negative electrode current collector.
  • the first tab and the second tab can also be fixed to the blank area of the positive electrode sheet and the negative electrode sheet respectively by welding.
  • the first plastic part 1 and the second plastic part 2 are integrally formed, and at least one end of the first plastic part 1 extends outward to form the second plastic part 2 .
  • both ends of the first plastic part 1 extend outward to form a second plastic part 2 .
  • the first plastic part 1 and the second plastic part 2 adopt an integral molding structure, which can not only improve the overall stability of the lower plastic part
  • the rigidity can also simplify the manufacturing process, reduce the production cost, and also help to control dimensional errors and improve the positioning accuracy of the first plastic part 1 and the second plastic part 2 .
  • At least one of the first plastic part 1 and the second plastic part 2 is provided with a clip part 31 and/or a buckle part 32 , and the first plastic part 1 and the second plastic part 2 are connected by clipping.
  • the second plastic part 2 is provided with a buckle part 32
  • the first plastic part 1 is provided with a clip part 31 .
  • the buckle part 32 cooperates with the clip part 31 to fix the second plastic part 2 to the first plastic part 1 . Occupies the internal space of the battery, so as to reserve more space for the electrode assembly and improve the energy density of the battery; the radius of the buckle portion 32 is larger than the radius of the card portion 31, which is convenient for the buckle portion 32 to be fixed in the card portion 31.
  • the buckle portion 32 can be designed as It includes two half tenons separated in the middle, and there is a certain gap between the two half tenons, so that when the buckle part 32 is inserted into the card part 31 , the two half tenons stretch toward each other to facilitate insertion into the card part 31 .
  • the buckle portion 32 can also be set in the shape of other two ends that are thin and thick in the middle, and can be fixed to the clip portion 31 , but the invention is not limited to this. 2.
  • a clip portion 31 is provided.
  • the first plastic piece 1 can be provided with a buckle portion 32 and a clip portion 31.
  • the second plastic piece 2 is provided with a clip portion 31 and a buckle portion 32 to improve the first plastic piece 1.
  • the stability between the first plastic part 1 and the second plastic part 2 can maintain the relative positional relationship between the first plastic part 1 and the second plastic part 2 after assembly, and improve the stability of the battery assembly.
  • the present invention is not limited to this, because when assembling batteries, the arrangement of various components in the casing of batteries of different types or sizes will also be different, and the second plastic part 2 is fixedly connected to the first plastic part 1 after being turned over.
  • the fixed connection method also includes bonding, thermal welding and ultrasonic connection.
  • a bending part 4 is arranged between the first plastic part 1 and the second plastic part 2 , the second plastic part 2 can be folded to the first plastic part 1 along the bending part 4 , and the bending part 4 is folded at the second plastic part 2 completely disconnected or at least one connection.
  • the bending part 4 is added, so that the first plastic part 1 and the second plastic part 2 can be bent at the bending part 4.
  • the structure of the bending part 4 can be designed to be partially broken after bending, which is convenient for For the positioning and connection of the first plastic part 1 and the second plastic part 2, the structure of the bending part 4 can also be designed to be completely disconnected after bending, which can reduce the accumulation of dimensional tolerances and prevent the lower plastic parts from being deformed.
  • the second plastic part 2 is provided with upwardly inclined inclined surfaces 5 along the front and rear side edges, and the inclined surfaces 5 are flat surfaces or downward convex curved surfaces.
  • the second plastic part 2 is provided with upwardly inclined inclined surfaces 5 along the edges on both sides of the front-rear direction Y, which can further prevent the tabs of the battery cells 9 from being folded during the assembly process, and the inclined surfaces 5 are flat or downwardly convex curved surfaces.
  • It is preferably a downward convex curved surface, which can avoid stress concentration caused by the bending of the pole tab at the corner of the second plastic part 2, or the situation where the sharp edge pierces the pole piece.
  • the wear and tear of the secondary battery further improves the performance of the secondary battery and prolongs the service life of the secondary battery.
  • Rounded corners 6 are provided on the upper and lower edges of the inclined upper and lower sides of the second plastic part 2 . Specifically, along the up-down direction Z, the upper and lower edges of the inclined upper and lower sides of the second plastic part 2 are provided with rounded corners 6. The rounded corners 6 can reduce the folding of the pole piece during the assembly process, and avoid stress concentration and sharp edge thorns. Broken pole pieces, etc.
  • the first plastic part 1 is provided with an explosion-proof valve ventilation hole 7 corresponding to the explosion-proof valve
  • the second plastic part 2 is provided with an explosion-proof valve ventilation hole 7 corresponding to the explosion-proof valve.
  • the explosion-proof valve can automatically and quickly release the pressure of the battery when the internal pressure of the battery rises due to overcharge, overdischarge, overcurrent and internal short circuit of the battery, so as to avoid the occurrence of safety accidents caused by battery explosion.
  • the explosion-proof valve ventilation hole 7 can ensure that the internal pressure of the battery can be released through the explosion-proof valve in time to ensure that the explosion-proof valve can be used normally.
  • the explosion-proof valve ventilation hole 7 includes but is not limited to the first plastic part 1 or the second plastic part 2.
  • the first plastic part 1 and the second plastic part 2 can be provided with explosion-proof valve ventilation holes 7 at the positions corresponding to the explosion-proof valve, so that the gas generated in the battery can easily reach the explosion-proof valve, reducing the probability of danger, and the explosion-proof valve is breathable.
  • the shape of the hole 7 may be a circular shape or an oval shape or the like.
  • the first plastic part 1 may also be provided with a liquid injection through hole matching the liquid injection port 81 to ensure the liquid injection efficiency.
  • the venting hole 7 of the explosion-proof valve can be composed of holes of various shapes such as triangular holes, circular holes, square holes, etc., and the plurality of holes can be arranged according to certain rules to form gas passages. It is preferably composed of a plurality of circular holes.
  • the secondary battery When the secondary battery is thermally out of control, it can not only ensure ventilation, but also prevent high-temperature fixed particles from passing through the mesh, thereby preventing other combustible and high-temperature solid particles from being ejected out of the explosion-proof valve and mixed with air, thereby significantly improving the battery safety performance. .
  • the battery cells 9 in the battery are prone to shaking during use.
  • the battery cell 9 in the battery is prone to shaking due to the shaking of the car during the traveling process.
  • the second plastic part 2 and the top surface of the battery cell 9 The ratio of the contact area to the total area of the top surface of the cell 9 is set to be greater than 50%.
  • the side of the second plastic part 2 in contact with the top surface of the battery core 9 is a plane structure. If the contact area between the second plastic part 2 and the top surface of the battery core 9 is too small, it is easy to cause the battery core 9 to shake.
  • the contact part of the top surface of the battery core 9 can limit the position of the battery core 9, so as to reduce the easy shaking of the battery core 9 in the battery. Therefore, the second plastic part 2 and the top surface of the battery core 9
  • the ratio of the contact area to the total area of the top surface of the cell 9 is greater than 50%, preferably 60%, 65%, 70%, 75%, 80%, 85% and above.
  • the material of at least one of the first plastic part 1 and the second plastic part 2 is 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 material, and the second plastic part 2 is made of PP material; the first plastic part 1 can also be made of PP material, and the second plastic part Part 2 is made of PPS, which prevents the plastic parts from being easily bent and deformed when the same material is used.
  • first plastic part 1 of this embodiment extends outwardly from any place between its two ends to form a second plastic part 2 . Any place between the two ends of the first plastic part 1 can extend outward to form the second plastic part 2 , and it is enough to ensure that the second plastic part 2 and the first plastic part 1 are rotatably connected.
  • the difference from the first embodiment is that at least one of the first plastic part 1 and the second plastic part 2 in this embodiment is provided with an adhesive layer and/or an adhesive surface, and the first plastic part 1 and the second plastic part 2 are adhered to each other. catch.
  • the first plastic part 1 or the second plastic part 2 is provided with adhesive materials such as an adhesive layer and an adhesive layer.
  • the first plastic part 1 and the second plastic part are fixed together, so that the relative positional relationship between the first plastic part 1 and the second plastic part 2 is maintained after assembly, and the stability of the battery assembly is improved. Effect.
  • the difference from the first embodiment is that in this embodiment, at least one of the first plastic part 1 and the second plastic part 2 is provided with a hot-melt column and/or a hot-melt groove, and the first plastic part 1 and the second plastic part 2 are heated Weld.
  • at least one hot-melt column is set on the first plastic part 1 or the second plastic part 2
  • a hot-melt groove is set at the corresponding position of the first plastic part 1 or the second plastic part 2.
  • a plastic part 1 and a second plastic part are fixed together, so that after assembly, the relative positional relationship between the first plastic part 1 and the second plastic part 2 is maintained, and the stability of the battery assembly is improved, and the battery is not occupied
  • the internal space of the battery so as to reserve more space for the electrode assembly and improve the energy density of the battery.
  • the thickness of the bending part 4 in this embodiment 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 is provided with a breaking line, a breaking groove and a breaking point. At least one of the holes, the bending part 4 is connected or disconnected after the second plastic part 2 is folded. Since the thickness of the bent portion 4 is smaller, it can be bent more easily. Preferably, the thickness of the bent portion 4 is 2-5 mm. The form is disconnected.
  • the thickness of the bending part 4 is less than The thickness of the first plastic part 1 or the thickness of the second plastic part 2 can also realize the breaking of the bending part 4 .
  • the bending part 4 can also be set to be broken, that is, the second plastic part 2 is bent to the first plastic part 1 and then disconnected, which can avoid the The accumulation of errors results in the deformation of the second plastic part 2 after the two are fixed.
  • one end of the first plastic part 1 extends outward to form the second plastic part 2 .
  • one second plastic part 2 needs to be bent towards the first plastic part 1, which saves the step of bending another second plastic part 2, which helps to simplify the production process and thus improves the production efficient.
  • the first plastic part 1 of this embodiment is broken into two parts along the middle part, and at least one end of each part extends outward to form the second plastic part 2 .
  • the first plastic part 1 is broken into two parts along the middle part, that is, the first plastic part 1 is divided into two parts along the left and right direction X, which are separated at the explosion-proof valve, and the first plastic part 1 on the left part is close to the explosion-proof valve.
  • One side extends to form the second plastic part 2, or the side away from the explosion-proof valve extends to form the second plastic part 2.
  • the first plastic part 1 on the right side can also form the second plastic part 2 according to this structure;
  • the plastic part 1 is broken into two parts along the middle part, so that the first plastic part 1 and the second plastic part 2 do not block the explosion-proof valve, so there is no need to set the explosion-proof valve ventilation hole 7 on the first plastic part 1 and the second plastic part 2 ,
  • the error accumulation between the first plastic part 1 and the second plastic part 2 can be avoided, resulting in the deformation of the second plastic part 2 after the two are fixed.
  • one end of the first plastic part 1 and the second plastic part 2 are hinged, riveted or ultrasonically connected.
  • one end of the first plastic part 1 and the second plastic part 2 are hinged, that is, the first plastic part 1 and the second plastic part 2 are connected by a rotating shaft.
  • Both the part 1 and the second plastic part 2 are provided with a shaft hole.
  • a shaft hole is provided to satisfy the rotational connection between the two, which helps to achieve a better rotational connection between the first plastic part 1 and the second plastic part 2, which not only reduces the resistance during the rotation process, but also reduces the second plastic part. 2. The probability of springback during use.
  • One end of the first plastic part 1 and the second plastic part 2 can also be ultrasonically connected.
  • folding because the strength of the hot melt is relatively low, it is easier to bend, which means that the thickness of the connection between the two is smaller, that is, the second plastic part 2 is bent to the first plastic part 1 and then disconnected, which can This avoids the situation that the second plastic part 2 is deformed after the two are fixed due to the accumulation of errors between the first plastic part 1 and the second plastic part 2 .
  • a top cover assembly structure includes a top cover sheet 8 and a lower plastic part as in Embodiment 1 to Embodiment 6, and the lower plastic part is arranged at the bottom of the top cover sheet 8 .
  • the battery has two poles for outputting electric energy to the outside, which are the first pole and the second pole, which are both arranged on the top cover sheet 8 , and the first pole can be
  • the positive pole can also be a negative pole.
  • the second pole is a negative pole or a positive pole.
  • the first plastic part 1 is provided with through holes corresponding to the first pole and the second pole of the top cover sheet 8 .
  • the first plastic part 1 and the second plastic part 2 play the role of insulating the top cover sheet 8 and the battery core 9, and can also prevent the electrolyte from corroding the top cover sheet 8, which helps to prolong the service life of the battery.
  • the top cover sheet 8 is provided with a liquid injection port 81
  • the second plastic part 2 is provided with a liquid injection mesh 21
  • the liquid injection mesh 21 covers at least the vertical projection surface of the liquid injection port 81
  • the liquid injection mesh 21 The area of the mesh is smaller than the area of the liquid injection port 81 .
  • the liquid injection net 21 is provided with several mesh holes, and the size of the mesh holes is smaller than the size of the liquid injection port 81.
  • the liquid injection mesh 21 can prevent the glue nails of the liquid injection port 81 from falling into the battery cell 9 from the liquid injection port 81 during the formation process. Inside, the liquid injection net 21 at least completely covers the range of the projection surface below the liquid injection port 81 .
  • the first plastic part 1 is provided with a liquid injection through hole matching the liquid injection port 81 , and the liquid injection through hole is located directly above the liquid injection screen 21 . .
  • the mesh holes in the liquid injection net 21 can be composed of holes of various shapes such as triangular holes, circular holes, square holes, etc.
  • the plurality of holes can be arranged according to certain rules to form gas channels, and it is preferable to use a plurality of circular holes. .
  • a boss 811 extends from the lower surface of the liquid injection port 81 , and the liquid injection net 21 is correspondingly provided with a protective protrusion 211 , and the radius of the protective protrusion 211 is larger than the radius of the boss 811 .
  • a boss 811 protrudes below the liquid injection port 81 , the second plastic part 2 is provided with a protection boss 211 corresponding to the boss 811 , the radius of the protection boss 211 is larger than the radius of the boss 811 , and the protection boss 211 matches the boss 811 can prevent the formation nails from falling into the gap between the first plastic part 1 and the second plastic part 2 from the liquid injection port 81 , wherein the boss 811 can be formed by punching the lower surface of the top cover sheet 8 .
  • the protective protrusion 211 is provided with a plurality of overflow grooves 2111 .
  • a plurality of overflow grooves 2111 are provided on the protective protrusion 211.
  • the overflow grooves 2111 ensure that after the second plastic part 2 is fixed to the first plastic part 1, the protective protrusion A closed flow channel will not be formed between 211 and the boss 811, and the electrolyte can flow from the overflow groove 2111 to the outside of the protection protrusion 211 to ensure the injection efficiency.
  • At least one of the top cover sheet 8 and the first plastic part 1 is provided with a hot melt column and/or a hot melt groove, and the top cover sheet 8 and the first plastic part 1 are thermally welded.
  • at least one hot-melt column is set on the top cover sheet 8 or the first plastic part 1
  • a hot-melt groove is set at the corresponding position of the top cover sheet 8 or the first plastic part 1
  • the top cover sheet is connected by hot-melt connection.
  • 8 and the first plastic part 1 are fixed together, which helps to prevent the plastic from warping, and also helps to improve the stability between the top cover sheet 8 and the first plastic part 1, and does not occupy the internal space of the battery, so Reserve more space for the electrode assembly to improve the energy density of the battery.
  • a power battery includes a battery cell 9 , a battery case accommodating the battery cell 9 , and a top cover sheet 8 sealed and mounted on the battery case.
  • the tabs of the battery cells 9 are fixed between the first plastic part 1 and the second plastic part 2 .
  • the top cover sheet 8 is provided with mounting holes corresponding to the first pole post and the second pole post, the first pole post and the second pole post are sleeved with sealing members, and the first plastic part 1 is provided with the top cover sheet 8 .
  • the through holes corresponding to the first pole and the second pole, the sealing member and the first plastic part 1 all play the role of the insulating top cover 8 and the pole.
  • the cell 9 in the battery is connected with the first pole and the second pole.
  • Diode tabs the first tab is connected to the first pole, and the second tab is connected to the second pole by means of laser welding, wherein the positive electrode sheet, the diaphragm and the negative electrode sheet in the battery core 9 can be stacked in sequence and winding, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material coated on the surface of the positive electrode current collector, and the negative electrode sheet includes a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector.
  • the first tab is connected to the positive electrode current collector, the second tab is connected to the negative electrode current collector, the edge of the positive electrode current collector may have a blank area not covered by the positive active material, and the first tab can be directly formed by cutting the blank area . Similarly, the second tab can be directly cut through the blank area of the negative electrode current collector.
  • the first tab and the second tab can also be fixed to the blank area of the positive electrode sheet and the negative electrode sheet respectively by welding.
  • an adapter sheet is used in the assembly process, and the adapter sheet includes a first adapter sheet and a second adapter sheet.
  • the first tab is connected to the first pole through the first adapter.
  • the second tabs are all connected with the second poles through the second transfer piece, so as to improve the orderly connection inside the battery.

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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

A power battery, a top cover assembly structure, and a lower plastic member for a power battery. The lower plastic member for a power battery comprises: a first plastic part (1) for isolating battery cells (9) from a top cover plate (8); and second plastic parts (2) connected to the first plastic part (1). The lower plastic member has a mount state and a pre-mount state. When the lower plastic member is in the mount state, the second plastic parts (2) move toward each other to a position on the first plastic part (1). The lower plastic member for a power battery can simplify assembly steps, facilitates reducing manufacturing costs, reduces errors in an overall size, and improves an overall assembly effect of a battery.

Description

一种动力电池用下塑胶件、顶盖装配结构及动力电池A lower plastic part for power battery, top cover assembly structure and power battery
本申请要求于2020年07月08日提交中国专利局、申请号为202010649180.1、发明名称为“一种动力电池用下塑胶件、顶盖装配结构及动力电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application filed on July 08, 2020, with the application number of 202010649180.1 and the invention titled "A lower plastic part for a power battery, a top cover assembly structure and a power battery". The entire contents of this application are incorporated by reference.
技术领域technical field
本发明属于电池的技术领域，具体涉及一种动力电池用下塑胶件、顶盖装配结构及动力电池。The invention belongs to the technical field of batteries, and in particular relates to a lower plastic part for a power battery, a top cover assembly structure and a power battery.
背景技术Background technique
动力电池一般包括顶盖、电芯、壳体、顶盖下塑胶等结构，电芯固定在壳体内，电芯顶端伸出有极片与顶盖上固定的极柱连接，顶盖下塑胶安装在顶盖下方，通过顶盖下塑胶将顶盖和电芯绝缘隔开。也可以在装配时，先将正极极耳和负极极耳与极柱焊接后，然后将电芯置于壳体内，安装电池顶盖。为防止电芯与极柱之间接触，使用极耳垫板使得电芯与极柱之间有一定的安全距离。The power battery generally includes structures such as a top cover, a cell, a shell, and a plastic under the top cover. The cell is fixed in the shell, and a pole piece protrudes from the top of the cell to connect with the fixed pole on the top cover, and the plastic is installed under the top cover. Under the top cover, the top cover is insulated from the cell by the plastic under the top cover. During assembly, the positive electrode tab and the negative electrode tab are welded to the pole first, and then the battery core is placed in the casing, and the battery top cover is installed. In order to prevent the contact between the cell and the pole, a tab pad is used so that there is a certain safety distance between the cell and the pole.
但由于增加了极耳垫板，需要增加了相应的制造过程和装配步骤；一方面，使得加工、装配工艺更复杂，在装配过程中还容易造成极耳垫板漏装；另一方面，极耳垫板制造过程的误差，以及与下塑胶之间的装配误差，容易影响装配效果。However, due to the addition of the tab pads, the corresponding manufacturing process and assembly steps need to be added; on the one hand, the processing and assembly processes are more complicated, and the tab pads are easily missed during the assembly process; Errors in the manufacturing process of the ear pads and assembly errors with the lower plastic can easily affect the assembly effect.
发明内容SUMMARY OF THE INVENTION
本发明的目的之一在于：针对现有技术的不足，提供一种动力电池用下塑胶件，能够简化装配步骤，有助于降低制造成本，还能减少整体尺寸误差，提高电池整体装配效果。One of the objectives of the present invention is to provide a lower plastic part for a power battery in view of the deficiencies of the prior art, which can simplify assembly steps, help reduce manufacturing costs, reduce overall dimensional errors, and improve the overall assembly effect of the battery.
为了实现上述目的，本发明采用如下技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种动力电池用下塑胶件，包括：A lower plastic part for a power battery, comprising:
第一塑胶件，用于间隔电池电芯与顶盖片；The first plastic part is used to separate the battery cells and the top cover sheet;
第二塑胶件，与所述第一塑胶件连接；a second plastic part connected to the first plastic part;
其中，所述下塑胶件具有安装状态和预安装状态，其中，当处于所述安装状态时，所述第二塑胶件运动至所述第一塑胶件同向位置处。Wherein, the lower plastic part has an installed state and a pre-installed state, wherein when in the installed state, the second plastic part moves to the same position of the first plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件与所述第二塑胶件为一体成型结构。As an improvement of the lower plastic part for a power battery according to the present invention, the first plastic part and the second plastic part are integrally formed.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件的至少一端部向外延伸形成所述第二塑胶件。As an improvement of the lower plastic part for a power battery according to the present invention, at least one end of the first plastic part extends outward to form the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件在其两个端部之间的任意一处向外延伸形成所述第二塑胶件。As an improvement of the lower plastic part for a power battery according to the present invention, the first plastic part extends outwardly from any place between its two ends to form the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件与所述第二塑胶件的一端铰接、铆接或超声连接。As an improvement of the lower plastic part for a power battery according to the present invention, the first plastic part is hinged, riveted or ultrasonically connected to one end of the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第二塑胶件翻转后与所述第一塑胶件固定连接，固定连接方式包括以下至少之一：卡接、粘接、热熔接和超声连接。As an improvement of the lower plastic part for a power battery according to the present invention, the second plastic part is fixedly connected to the first plastic part after being turned over, and the fixed connection method includes at least one of the following: clamping, sticking welding, thermal welding and ultrasonic bonding.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件和所述第二塑胶件至少一者设置有卡部和/或扣部，所述第一塑胶件与所述第二塑胶件卡扣连接。As an improvement of the lower plastic part for a power battery according to the present invention, at least one of the first plastic part and the second plastic part is provided with a clip part and/or a buckle part, and the first plastic part is The piece is snap-connected with the second plastic piece.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件和所述第二塑胶件至少一者设置有黏贴层和/或黏贴面，所述第一塑胶件与所述第二塑胶件粘接。As an improvement of the lower plastic part for a power battery according to the present invention, 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 and the second plastic part are provided with an adhesive layer and/or an adhesive surface. A plastic part is bonded to the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件和所述第二塑胶件至少一者设置有热熔柱和/或热熔槽，所述第一塑胶件与所述第二塑胶件热熔接。As an improvement of the lower plastic part for a power battery according to the present invention, at least one of the first plastic part and the second plastic part is provided with a hot-melt column and/or a hot-melt groove, and the first plastic part and the second plastic part are provided with a hot-melt column and/or a hot-melt groove. A plastic part is thermally welded to the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件和所述第二塑胶件之间设置有弯折部，所述第二塑胶件可沿所述弯折部向所述第一塑胶件折叠，所述弯折部在所述第二塑胶件折叠后完全断开或至少一处连接。As an improvement of the lower plastic part for a power battery according to the present invention, a bending part is provided between the first plastic part and the second plastic part, and the second plastic part can be The bending part is folded toward the first plastic part, and the bending part is completely disconnected or connected at least in one place after the second plastic part is folded.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述弯折部的厚度小于所述第一塑胶件的厚度或所述第二塑胶件的厚度。As an improvement of the lower plastic part for a power battery according to the present invention, the thickness of the bending part is smaller than the thickness of the first plastic part or the thickness of the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述弯折部设置有断裂线、断开槽和断开孔中的至少一种，所述弯折部在所述第二塑胶件折叠后连接或断开。As an improvement of the lower plastic part for a power battery according to the present invention, the bending part is provided with at least one of a breaking line, a breaking groove and a breaking hole; The second plastic part is connected or disconnected after being folded.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第二塑胶件沿前后两侧边缘设置有向上倾斜的倾斜面，所述倾斜面为平面或下凸曲面。As an improvement of the lower plastic part for a power battery according to the present invention, the second plastic part is provided with an upwardly inclined inclined surface along the front and rear edges, and the inclined surface is a plane or a downwardly convex curved surface.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第二塑胶件两侧的斜面上下侧边缘设置有倒圆角。As an improvement of the lower plastic part for a power battery according to the present invention, rounded corners are provided on the upper and lower edges of the sloped upper and lower sides of the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件沿中部断开成两部分，每部分的至少一端部向外延伸形成所述第二塑胶件。As an improvement of the lower plastic part for a power battery according to the present invention, the first plastic part is divided into two parts along the middle part, and at least one end of each part extends outward to form the second plastic part.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件设置有与防爆阀对应的防爆阀透气孔，和/或所述第二塑胶件设置有与防爆阀对应的防爆阀透气孔。As an improvement of the lower plastic part for a power battery according to the present invention, the first plastic part is provided with an explosion-proof valve ventilation hole corresponding to the explosion-proof valve, and/or the second plastic part is provided with an explosion-proof valve corresponding to the explosion-proof valve. The vent hole of the explosion-proof valve corresponding to the valve.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第二塑胶件和所述电芯顶面的接触的面积与所述电芯顶面的总面积之比大于50％。As an improvement of the lower plastic part for a power battery according to the present invention, the ratio of the contact area between the second plastic part and the top surface of the battery cell to the total area of the top surface of the battery core is greater than 50 %.
作为本发明所述的一种动力电池用下塑胶件的一种改进，所述第一塑胶件和所述第二塑胶件至少一者的材质为PPS和/或PP。As an improvement of the lower plastic part for a power battery according to the present invention, at least one of the first plastic part and the second plastic part is made of PPS and/or PP.
本发明的目的之二在于提供一种顶盖装配结构，包括顶盖片及如上述的下塑胶件，所述下塑胶件设置在所述顶盖片的底部。The second objective of the present invention is to provide a top cover assembly structure, which includes a top cover sheet and the above-mentioned lower plastic part, wherein the lower plastic part is arranged at the bottom of the top cover sheet.
作为本发明所述的一种顶盖装配结构的一种改进，所述顶盖片上设置有注液口，第二塑胶件设置有注液网，所述注液网至少覆盖所述注液口的垂直投影面，所述注液网的网孔的面积小于所述注液口的面积。As an improvement of the top cover assembly structure of the present invention, the top cover sheet is provided with a liquid injection port, the second plastic part is provided with a liquid injection net, and the liquid injection net at least covers the liquid injection port , the area of the mesh of the liquid injection net is smaller than the area of the liquid injection port.
作为本发明所述的一种顶盖装配结构的一种改进，所述注液口下表面延伸有凸台，所述注液网对应设置有保护凸起，所述保护凸起半径大于所述凸台半径。As an improvement of the top cover assembly structure of the present invention, a boss extends from the lower surface of the liquid injection port, and a protection protrusion is correspondingly provided on the liquid injection net, and the radius of the protection protrusion is larger than the radius of the protection protrusion. Boss radius.
作为本发明所述的一种顶盖装配结构的一种改进，所述保护凸起上设有若干个溢流槽。As an improvement of the top cover assembly structure of the present invention, the protective protrusion is provided with a plurality of overflow grooves.
作为本发明所述的一种顶盖装配结构的一种改进，所述顶盖片和第一塑胶件至少一者设置有热熔柱和/或热熔槽，所述顶盖片和所述第一塑胶件热熔接。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 hot melt column and/or a hot melt groove, and the top cover sheet and the The first plastic part is thermally welded.
本发明的目的之三在于提供一种动力电池，包括电芯、容纳所述电芯的电池壳体，以及密封安装在所述电池壳体上的顶盖片，所述电芯与所述顶盖片之间设置有上述的下塑胶件，所述电芯的极耳固定在第一塑胶件与第二塑胶件之间。The third object of the present invention is to provide a power battery, including a battery cell, a battery case for accommodating the battery cell, and a top cover sheet sealingly mounted on the battery case, the battery cell and the top cover The lower plastic part is arranged between the cover sheets, and the tabs of the battery core are fixed between the first plastic part and the second plastic part.
本发明的有益效果在于，本发明包括第一塑胶件，用于间隔电池电芯与顶盖片；以及第二塑胶件，与所述第一塑胶件连接；其中，所述下塑胶件具有安装状态和预安装状态，其中，当处于所述安装状态时，所述第二塑胶件运动至所述第一塑胶件同向位置处。由于现有的电芯和顶盖之间增加了极耳垫板，增加了相应的制造过程和装配步骤；一方面，使得加工、装配工艺更复杂，在装配过程中还容易造成极耳垫板漏装；另一方面，极耳垫板制造过程的误差，以及与下塑胶之间的装配误差，容易影响装配效果，因此，将第二塑胶件与第一塑胶件转动连接，且第二塑胶件可相对第一塑胶件进行翻转，使得第一塑胶件和第二塑胶件采用一体式设计，相当于单个零件，而且下塑胶件具有安装状态和预安装状态，第二塑胶件2运动至第一塑胶件1同向位置处，不仅装配误差较小，而且便于对第一塑胶件和第二塑胶件安装定位，而且省去了安装极耳垫板，简化装配步骤，避免在装配过程中发生漏装的情况，有助于简化生产工艺，从而降低制造成本。本发明能够简化装配步骤，有助于降低制造成本，还能减少整体尺寸误差，提高电池整体装配效果。The beneficial effect of the present invention is that the present invention includes a first plastic part for separating the battery cells and the top cover sheet; and a second plastic part, which is connected with the first plastic part; wherein, the lower plastic part has an installation The state and the pre-installed state, wherein, when in the installed state, the second plastic part moves to the same position as the first plastic part. Since a tab pad is added between the existing battery cell and the top cover, the corresponding manufacturing process and assembly steps are added; on the one hand, the processing and assembly processes are more complicated, and the tab pad is easily caused during the assembly process. Missing assembly; on the other hand, the error in the manufacturing process of the tab pad and the assembly error with the lower plastic can easily affect the assembly effect. Therefore, the second plastic part is rotated and connected to the first The first plastic part can be turned over relative to the first plastic part, so that the first plastic part and the second plastic part adopt an integrated design, which is equivalent to a single part, and the lower plastic part has an installed state and a pre-installed state, and the second plastic part 2 moves to the first A plastic part 1 is located in the same direction, not only the assembly error is small, but also the installation and positioning of the first plastic part and the second plastic part is convenient, and the installation of the tab pad is omitted, which simplifies the assembly steps and avoids the occurrence of accidents during the assembly process. The case of missing packaging helps to simplify the production process, thereby reducing the manufacturing cost. The invention can simplify assembly steps, help reduce manufacturing cost, reduce overall size error, and improve the overall assembly effect of the battery.
附图说明Description of drawings
图1为本发明中实施方式一的结构示意图。FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.
图2为本发明中实施方式一弯折前的结构示意图。FIG. 2 is a schematic structural diagram of Embodiment 1 of the present invention before bending.
图3为本发明中实施方式一弯折后的结构示意图。FIG. 3 is a schematic diagram of the structure after bending according to Embodiment 1 of the present invention.
图4为本发明中实施方式六的第一塑胶件一端形成第二塑胶件的结构 示意图。FIG. 4 is a schematic structural diagram of a second plastic part formed at one end of the first plastic part according to Embodiment 6 of the present invention.
图5为本发明中实施方式八的第一塑胶件和第二塑胶件铰接时的结构示意图。FIG. 5 is a schematic structural diagram of the first plastic part and the second plastic part in the eighth embodiment of the present invention when they are hinged.
图6为本发明中实施方式九的结构示意图。FIG. 6 is a schematic structural diagram of Embodiment 9 of the present invention.
图7为本发明中实施方式九的剖面结构示意图。FIG. 7 is a schematic cross-sectional structure diagram of Embodiment 9 of the present invention.
图8为图7的A处放大图。FIG. 8 is an enlarged view of part A of FIG. 7 .
图9为本发明中实施方式十的结构示意图FIG. 9 is a schematic structural diagram of Embodiment 10 of the present invention
其中：1-第一塑胶件；2-第二塑胶件；21-注液网；211-保护凸起；2111-溢流槽；31-卡部；32-扣部；4-弯折部；5-倾斜面；6-倒圆角；7-防爆阀透气孔；8-顶盖片；81-注液口；811-凸台；9-电芯；Z-上下方向；X-左右方向；Y-前后方向。Among them: 1-first plastic part; 2-second plastic part; 21-liquid injection net; 211-protection protrusion; 2111-overflow groove; 31-clamp part; 32-buckle part; 4-bending part; 5-inclined surface; 6-rounded corner; 7-explosion-proof valve ventilation hole; 8-top cover sheet; 81-liquid injection port; 811-boss; 9-battery core; Z-up and down direction; X-left and right direction; Y - Front and rear direction.
具体实施方式detailed description
如在说明书及权利要求当中使用了某些词汇来指称特定组件。本领域技术人员应可理解，硬件制造商可能会用不同名词来称呼同一个组件。本说明书及权利要求并不以名称的差异来作为区分组件的方式，而是以组件在功能上的差异来作为区分的准则。如在通篇说明书及权利要求当中所提及的“包含”为一开放式用语，故应解释成“包含但不限定于”。“大致”是指在可接受的误差范围内，本领域技术人员能够在一定误差范围内解决技术问题，基本达到技术效果。As used in the specification and claims, certain terms are used to refer to particular components. It should be understood by those skilled in the art that hardware manufacturers may refer to the same component by different nouns. The description and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as a criterion for distinguishing. As mentioned in the entire specification and claims, "comprising" is an open-ended term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range, and basically achieve technical effects.
在本发明的描述中，需要理解的是，术语“上”、“下”、“前”、“后”、“左”、“右”、水平”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. is based on the accompanying drawings The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. limits.
在发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是 直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。In the invention, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
以下结合附图1～9对本发明作进一步详细说明，但不作为对本发明的限定。The present invention will be further described in detail below with reference to Figures 1 to 9, but it is not intended to limit the present invention.
实施方式一 Embodiment 1
一种动力电池用下塑胶件，包括：A lower plastic part for a power battery, comprising:
第一塑胶件1，用于间隔电池电芯9与顶盖片8；The first plastic part 1 is used to separate the battery cells 9 and the top cover sheet 8;
第二塑胶件2，与第一塑胶件1连接；The second plastic part 2 is connected with the first plastic part 1;
其中，下塑胶件具有安装状态和预安装状态，其中，当处于安装状态时，第二塑胶件2运动至第一塑胶件1同向位置处。Wherein, the lower plastic part has an installed state and a pre-installed state, wherein when in the installed state, the second plastic part 2 moves to the same position as the first plastic part 1 .
由于现有的电芯和顶盖之间增加了极耳垫板，增加了相应的制造过程和装配步骤；一方面，使得加工、装配工艺更复杂，在装配过程中还容易造成极耳垫板漏装；另一方面，极耳垫板制造过程的误差，以及与下塑胶之间的装配误差，容易影响装配效果，因此，参见图1～3，将第二塑胶件2与第一塑胶件1转动连接，使得第一塑胶件1和第二塑胶件2采用一体式设计，相当于单个零件，而且下塑胶件具有安装状态和预安装状态，第二塑胶件2运动至第一塑胶件1同向位置处，不仅装配误差较小，而且便于对第一塑胶件1和第二塑胶件2安装定位，而且省去了安装极耳垫板，简化装配步骤，避免在装配过程中发生漏装的情况，有助于简化生产工艺，从而降低制造成本。其中，预安装状态包括但不限于下塑胶件处于展开状态，还包括第一塑胶件1和第二塑胶件2之间可形成除零度外的任意角度的状态。Since a tab pad is added between the existing battery cell and the top cover, the corresponding manufacturing process and assembly steps are added; on the one hand, the processing and assembly processes are more complicated, and the tab pad is easily caused during the assembly process. Missing assembly; on the other hand, the error in the manufacturing process of the tab pad and the assembly error with the lower plastic can easily affect the assembly effect. Therefore, referring to Figures 1 to 3, the second plastic part 2 and the first plastic part are connected 1. Rotate connection, so that the first plastic part 1 and the second plastic part 2 adopt an integrated design, which is equivalent to a single part, and the lower plastic part has an installed state and a pre-installed state, and the second plastic part 2 moves to the first plastic part 1. At the same direction position, not only the assembly error is small, but also the installation and positioning of the first plastic part 1 and the second plastic part 2 is convenient, and the installation of the tab pad is omitted, which simplifies the assembly steps and avoids missing assembly during the assembly process. , which helps to simplify the production process, thereby reducing the manufacturing cost. The pre-installed state includes but is not limited to a state where the lower plastic part is unfolded, and also includes a state in which any angle other than zero degrees can be formed between the first plastic part 1 and the second plastic part 2 .
参见图1～3，于本实施方式中，电池用于向外部输出电能的极柱有两个，分别为第一极柱、第二极柱，均设置在顶盖片8上，第一极柱可以为正极柱也可以为负极柱，相应地，第二极柱为负极柱或正极柱，第一塑胶件1开设有和顶盖片8的第一极柱、第二极柱对应的通孔，电池内的电芯9连接有第一极耳与第二极耳，采用激光焊接的方式，将第一极耳与第一极柱连接，第二极耳与第二极柱连接，其中，电芯9内的正极片、隔膜及 负极片可以顺序堆叠并卷绕，正极片包括正极集流体，以及涂覆于正极集流体表面的正极活性材料，负极片包括负极集流体，以及涂覆于负极集流体表面的负极活性材料。第一极耳连接于正极集流体，第二极耳连接于负极集流体，正极集流体的边缘处可具有未被正极活性材料覆盖的空白区，第一极耳可直接通过裁切空白区形成。同样的，第二极耳可直接通过裁切负极集流体的空白区，此外，第一极耳和第二极耳也可以通过焊接分别固定于正极片和负极片的空白区。Referring to FIGS. 1 to 3 , in this embodiment, the battery has two poles for outputting electrical energy to the outside, namely a first pole and a second pole, which are both disposed on the top cover 8 , and the first pole The column can be either a positive pole or a negative pole. Correspondingly, the second pole is a negative pole or a positive pole, and the first plastic part 1 is provided with a connection corresponding to the first pole and the second pole of the top cover sheet 8 . hole, the cell 9 in the battery is connected with a first tab and a second tab, and the first tab and the first pole are connected by laser welding, and the second tab is connected with the second pole, wherein , the positive electrode sheet, separator and negative electrode sheet in the battery core 9 can be stacked and wound in sequence, the positive electrode sheet includes a positive electrode current collector, and the positive electrode active material coated on the surface of the positive electrode current collector, the negative electrode sheet includes a negative electrode current collector, and the coating The negative electrode active material on the surface of the negative electrode current collector. The first tab is connected to the positive electrode current collector, the second tab is connected to the negative electrode current collector, the edge of the positive electrode current collector may have a blank area not covered by the positive active material, and the first tab can be directly formed by cutting the blank area . Similarly, the second tab can be directly cut through the blank area of the negative electrode current collector. In addition, the first tab and the second tab can also be fixed to the blank area of the positive electrode sheet and the negative electrode sheet respectively by welding.
第一塑胶件1与第二塑胶件2为一体成型结构，第一塑胶件1的至少一端部向外延伸形成第二塑胶件2。具体的，参见图1～3，第一塑胶件1两端向外延伸形成第二塑胶件2，第一塑胶件1与第二塑胶件2采用一体成型结构，不仅能够提高下塑胶件整体的刚性，还能简化制造工艺，降低生产成本，还有助于控制尺寸误差，提高第一塑胶件1与第二塑胶件2的定位的准确性。The first plastic part 1 and the second plastic part 2 are integrally formed, and at least one end of the first plastic part 1 extends outward to form the second plastic part 2 . Specifically, referring to FIGS. 1 to 3 , both ends of the first plastic part 1 extend outward to form a second plastic part 2 . The first plastic part 1 and the second plastic part 2 adopt an integral molding structure, which can not only improve the overall stability of the lower plastic part The rigidity can also simplify the manufacturing process, reduce the production cost, and also help to control dimensional errors and improve the positioning accuracy of the first plastic part 1 and the second plastic part 2 .
第一塑胶件1和第二塑胶件2至少一者设置有卡部31和/或扣部32，第一塑胶件1与第二塑胶件2卡扣连接。具体的，第二塑胶件2设有扣部32，第一塑胶件1设有卡部31，扣部32和卡部31配合，将第二塑胶件2固定到第一塑胶件1，不会占用电池的内部空间，从而给电极组件预留更多的空间，提高电池的能量密度；扣部32半径大于卡部31半径，便于扣部32固定在卡部31中，扣部32可以设计为包括两个中间分开的半榫，两个半榫之间有一定间隙，从而在扣部32插入卡部31中的时候，两个半榫向彼此方向伸缩，便于插入到卡部31中。扣部32也可以设置为其它两端细中间较粗的形状，能够固定到卡部31中，但本发明不以此为限，第一塑胶件1可设有扣部32，第二塑胶件2设有卡部31，此外，第一塑胶件1可设有扣部32和卡部31，相应的，第二塑胶件2设有卡部31和扣部32，以提高第一塑胶件1和第二塑胶件2之间的稳固性，实现了在装配后，保持第一塑胶件1与第二塑胶件2的相对位置关系，提高了电池装配的稳定性的效果。但本发明不以此为限，因在装配电池时，不同型号或不同尺寸的电池其壳体内的各个部件的排布也会不同，第二塑胶件2翻转后与第一塑胶件1固定连接，固定连接方式还包括粘接、热熔接和超声连接。At least one of the first plastic part 1 and the second plastic part 2 is provided with a clip part 31 and/or a buckle part 32 , and the first plastic part 1 and the second plastic part 2 are connected by clipping. Specifically, the second plastic part 2 is provided with a buckle part 32 , and the first plastic part 1 is provided with a clip part 31 . The buckle part 32 cooperates with the clip part 31 to fix the second plastic part 2 to the first plastic part 1 . Occupies the internal space of the battery, so as to reserve more space for the electrode assembly and improve the energy density of the battery; the radius of the buckle portion 32 is larger than the radius of the card portion 31, which is convenient for the buckle portion 32 to be fixed in the card portion 31. The buckle portion 32 can be designed as It includes two half tenons separated in the middle, and there is a certain gap between the two half tenons, so that when the buckle part 32 is inserted into the card part 31 , the two half tenons stretch toward each other to facilitate insertion into the card part 31 . The buckle portion 32 can also be set in the shape of other two ends that are thin and thick in the middle, and can be fixed to the clip portion 31 , but the invention is not limited to this. 2. A clip portion 31 is provided. In addition, the first plastic piece 1 can be provided with a buckle portion 32 and a clip portion 31. Correspondingly, the second plastic piece 2 is provided with a clip portion 31 and a buckle portion 32 to improve the first plastic piece 1. The stability between the first plastic part 1 and the second plastic part 2 can maintain the relative positional relationship between the first plastic part 1 and the second plastic part 2 after assembly, and improve the stability of the battery assembly. However, the present invention is not limited to this, because when assembling batteries, the arrangement of various components in the casing of batteries of different types or sizes will also be different, and the second plastic part 2 is fixedly connected to the first plastic part 1 after being turned over. , The fixed connection method also includes bonding, thermal welding and ultrasonic connection.
第一塑胶件1和第二塑胶件2之间设置有弯折部4，第二塑胶件2可沿弯折部4向第一塑胶件1折叠，弯折部4在第二塑胶件2折叠后完全断开或至少一处连接。增加弯折部4，使得第一塑胶件1和第二塑胶件2可在弯折部4弯折，根据实际生产需求，可以把弯折部4的结构设计成弯折后部分断开，便于第一塑胶件1和第二塑胶件2的定位和连接，也可以把弯折部4的结构设计成弯折后全部断开，能够减少尺寸公差累计，防止下塑胶件发生变形。A bending part 4 is arranged between the first plastic part 1 and the second plastic part 2 , the second plastic part 2 can be folded to the first plastic part 1 along the bending part 4 , and the bending part 4 is folded at the second plastic part 2 completely disconnected or at least one connection. The bending part 4 is added, so that the first plastic part 1 and the second plastic part 2 can be bent at the bending part 4. According to the actual production requirements, the structure of the bending part 4 can be designed to be partially broken after bending, which is convenient for For the positioning and connection of the first plastic part 1 and the second plastic part 2, the structure of the bending part 4 can also be designed to be completely disconnected after bending, which can reduce the accumulation of dimensional tolerances and prevent the lower plastic parts from being deformed.
第二塑胶件2沿前后两侧边缘设置有向上倾斜的倾斜面5，倾斜面5为平面或下凸曲面。具体的，第二塑胶件2沿前后方向Y两侧边缘设置有向上倾斜的倾斜面5，能够进一步避免装配过程中压折电芯9的极耳，且倾斜面5为平面或下凸曲面，优选为下凸曲面，能够避免极耳在第二塑胶件2的边角弯折造成应力集中，或边缘尖角刺破极片的情况，此外，倾斜面5可以减少对电芯9的极耳的磨损，进一步的提高二次电池的性能，延长二次电池的使用寿命。The second plastic part 2 is provided with upwardly inclined inclined surfaces 5 along the front and rear side edges, and the inclined surfaces 5 are flat surfaces or downward convex curved surfaces. Specifically, the second plastic part 2 is provided with upwardly inclined inclined surfaces 5 along the edges on both sides of the front-rear direction Y, which can further prevent the tabs of the battery cells 9 from being folded during the assembly process, and the inclined surfaces 5 are flat or downwardly convex curved surfaces. It is preferably a downward convex curved surface, which can avoid stress concentration caused by the bending of the pole tab at the corner of the second plastic part 2, or the situation where the sharp edge pierces the pole piece. The wear and tear of the secondary battery further improves the performance of the secondary battery and prolongs the service life of the secondary battery.
第二塑胶件2两侧的斜面上下侧边缘设置有倒圆角6。具体的，沿上下方向Z，第二塑胶件2两侧的斜面上下侧边缘设置有倒圆角6，倒圆角6能够减少装配过程中压折极片，避免发生应力集中、边缘尖角刺破极片等情况。Rounded corners 6 are provided on the upper and lower edges of the inclined upper and lower sides of the second plastic part 2 . Specifically, along the up-down direction Z, the upper and lower edges of the inclined upper and lower sides of the second plastic part 2 are provided with rounded corners 6. The rounded corners 6 can reduce the folding of the pole piece during the assembly process, and avoid stress concentration and sharp edge thorns. Broken pole pieces, etc.
第一塑胶件1设置有与防爆阀对应的防爆阀透气孔7，和/或第二塑胶件2设置有与防爆阀对应的防爆阀透气孔7。防爆阀能够在电池由于过充、过放、过流及电池内部短路导致电池内压上升时，使电池自动快速泄压，避免电池爆炸导致安全事故的发生。防爆阀透气孔7能够确保电池的内压能够及时通过防爆阀进行泄压，确保防爆阀能够正常使用，防爆阀透气孔7包括但不限于设置在第一塑胶件1或第二塑胶件2，第一塑胶件1和第二塑胶件2与防爆阀对应的位置均可设置防爆阀透气孔7，使得电池内产生的气体可以很容易的到达防爆阀处，降低发生危险的概率，防爆阀透气孔7的形状可以是圆形还可以是椭圆形等形状，此外，第一塑胶件1还可设置与注液口81匹配的注液通孔，保证注液效率。防爆阀透气孔7可以有三角形孔、圆形孔、方形孔等多种形状的孔组成，多个孔可以按照一定的规 则进行排列，形成气体通道，优选采用多个圆形孔组成，当二次电池发生热失控时，既能保证通气作用，又可以防止高温固定颗粒通过网孔，从而防止可燃性其他和高温固态颗粒一起喷出到防爆阀外与空气混合燃烧，从而显著提高电池安全性能。The first plastic part 1 is provided with an explosion-proof valve ventilation hole 7 corresponding to the explosion-proof valve, and/or the second plastic part 2 is provided with an explosion-proof valve ventilation hole 7 corresponding to the explosion-proof valve. The explosion-proof valve can automatically and quickly release the pressure of the battery when the internal pressure of the battery rises due to overcharge, overdischarge, overcurrent and internal short circuit of the battery, so as to avoid the occurrence of safety accidents caused by battery explosion. The explosion-proof valve ventilation hole 7 can ensure that the internal pressure of the battery can be released through the explosion-proof valve in time to ensure that the explosion-proof valve can be used normally. The explosion-proof valve ventilation hole 7 includes but is not limited to the first plastic part 1 or the second plastic part 2. The first plastic part 1 and the second plastic part 2 can be provided with explosion-proof valve ventilation holes 7 at the positions corresponding to the explosion-proof valve, so that the gas generated in the battery can easily reach the explosion-proof valve, reducing the probability of danger, and the explosion-proof valve is breathable. The shape of the hole 7 may be a circular shape or an oval shape or the like. In addition, the first plastic part 1 may also be provided with a liquid injection through hole matching the liquid injection port 81 to ensure the liquid injection efficiency. The venting hole 7 of the explosion-proof valve can be composed of holes of various shapes such as triangular holes, circular holes, square holes, etc., and the plurality of holes can be arranged according to certain rules to form gas passages. It is preferably composed of a plurality of circular holes. When the secondary battery is thermally out of control, it can not only ensure ventilation, but also prevent high-temperature fixed particles from passing through the mesh, thereby preventing other combustible and high-temperature solid particles from being ejected out of the explosion-proof valve and mixed with air, thereby significantly improving the battery safety performance. .
电池装配完成后，在使用过程中，电池内的电芯9容易出现晃动的情况。如应用在电动汽车的电池在使用过程中，其电池内的电芯9容易因为汽车在行进过程中的晃动而出现晃动，为了解决这个问题，将第二塑胶件2和电芯9顶面的接触的面积与电芯9顶面的总面积之比设为大于50％。第二塑胶件2与电芯9顶面接触的一面为平面结构，若第二塑胶件2和电芯9顶面的接触的面积过小，容易造成电芯9晃动，第二塑胶件2和电芯9顶面的接触的部分可以对电芯9起到限位的作用，实现了减少电池内电芯9容易出现晃动的情况，所以，将第二塑胶件2和电芯9顶面的接触的面积与电芯9顶面的总面积之比大于50％，优选为60％、65％、70％、75％、80％、85％及以上。After the battery is assembled, the battery cells 9 in the battery are prone to shaking during use. For example, when a battery used in an electric vehicle is in use, the battery cell 9 in the battery is prone to shaking due to the shaking of the car during the traveling process. To solve this problem, the second plastic part 2 and the top surface of the battery cell 9 The ratio of the contact area to the total area of the top surface of the cell 9 is set to be greater than 50%. The side of the second plastic part 2 in contact with the top surface of the battery core 9 is a plane structure. If the contact area between the second plastic part 2 and the top surface of the battery core 9 is too small, it is easy to cause the battery core 9 to shake. The contact part of the top surface of the battery core 9 can limit the position of the battery core 9, so as to reduce the easy shaking of the battery core 9 in the battery. Therefore, the second plastic part 2 and the top surface of the battery core 9 The ratio of the contact area to the total area of the top surface of the cell 9 is greater than 50%, preferably 60%, 65%, 70%, 75%, 80%, 85% and above.
第一塑胶件1和第二塑胶件2至少一者的材质为PPS和/或PP。第一塑胶件1和第二塑胶件2采用不同材质，具体的，第一塑胶件1为PPS材质，第二塑胶件2为PP材质；第一塑胶件1也可以为PP材质，第二塑胶件2为PPS材质，防止使用相同材料时塑胶件容易发生弯曲变形的情况。The material of at least one of the first plastic part 1 and the second plastic part 2 is 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 material, and the second plastic part 2 is made of PP material; the first plastic part 1 can also be made of PP material, and the second plastic part Part 2 is made of PPS, which prevents the plastic parts from being easily bent and deformed when the same material is used.
实施方式二 Embodiment 2
与实施方式一不同的是：本实施方式的第一塑胶件1在其两个端部之间的任意一处向外延伸形成第二塑胶件2。第一塑胶件1两个端部之间的任意一处均可向外延伸形成第二塑胶件2，确保第二塑胶件2与第一塑胶件1转动连接即可。The difference from the first embodiment is that the first plastic part 1 of this embodiment extends outwardly from any place between its two ends to form a second plastic part 2 . Any place between the two ends of the first plastic part 1 can extend outward to form the second plastic part 2 , and it is enough to ensure that the second plastic part 2 and the first plastic part 1 are rotatably connected.
其他结构与实施方式一相同，这里不再赘述。Other structures are the same as those in the first embodiment, and are not repeated here.
实施方式三Embodiment 3
与实施方式一不同的是：本实施方式的第一塑胶件1和第二塑胶件2至少一者设置有黏贴层和/或黏贴面，第一塑胶件1与第二塑胶件2粘接。具体的，在第一塑胶件1和第二塑胶件2折叠后的接触面上，在第一塑胶件1或第二塑胶件2设有黏贴层、胶黏层等黏性材料，通过粘接的连接方 式，将第一塑胶件1和第二塑胶件固定在一起，实现了在装配后，保持第一塑胶件1与第二塑胶件2的相对位置关系，提高了电池装配的稳定性的效果。The difference from the first embodiment is that at least one of the first plastic part 1 and the second plastic part 2 in this embodiment is provided with an adhesive layer and/or an adhesive surface, and the first plastic part 1 and the second plastic part 2 are adhered to each other. catch. Specifically, on the contact surface of the first plastic part 1 and the second plastic part 2 after being folded, the first plastic part 1 or the second plastic part 2 is provided with adhesive materials such as an adhesive layer and an adhesive layer. The first plastic part 1 and the second plastic part are fixed together, so that the relative positional relationship between the first plastic part 1 and the second plastic part 2 is maintained after assembly, and the stability of the battery assembly is improved. Effect.
其他结构与实施方式一相同，这里不再赘述。Other structures are the same as those in the first embodiment, and are not repeated here.
实施方式四 Embodiment 4
与实施方式一不同的是：本实施方式的第一塑胶件1和第二塑胶件2至少一者设置有热熔柱和/或热熔槽，第一塑胶件1与第二塑胶件2热熔接。具体的，在第一塑胶件1或第二塑胶件2上设置至少一个热熔柱，第一塑胶件1或第二塑胶件2对应的位置设置热熔槽，通过热熔连接方式，将第一塑胶件1和第二塑胶件固定在一起，实现了在装配后，保持第一塑胶件1与第二塑胶件2的相对位置关系，提高了电池装配的稳定性的效果，还不会占用电池的内部空间，从而给电极组件预留更多的空间，提高电池的能量密度。The difference from the first embodiment is that in this embodiment, at least one of the first plastic part 1 and the second plastic part 2 is provided with a hot-melt column and/or a hot-melt groove, and the first plastic part 1 and the second plastic part 2 are heated Weld. Specifically, at least one hot-melt column is set on the first plastic part 1 or the second plastic part 2, and a hot-melt groove is set at the corresponding position of the first plastic part 1 or the second plastic part 2. A plastic part 1 and a second plastic part are fixed together, so that after assembly, the relative positional relationship between the first plastic part 1 and the second plastic part 2 is maintained, and the stability of the battery assembly is improved, and the battery is not occupied The internal space of the battery, so as to reserve more space for the electrode assembly and improve the energy density of the battery.
其他结构与实施方式一相同，这里不再赘述。Other structures are the same as those in the first embodiment, and are not repeated here.
实施方式五 Embodiment 5
与实施方式一不同的是：本实施方式的弯折部4的厚度小于第一塑胶件1的厚度或第二塑胶件2的厚度，弯折部4设置有断裂线、断开槽和断开孔中的至少一种，弯折部4在第二塑胶件2折叠后连接或断开。由于弯折部4的厚度更小，能够更容易地折弯，优选的，弯折部4的厚度为2-5mm，弯折部4也可以通过设置断裂线、断开槽和断开孔的形式实现断开，当弯折部4断开时，弯折部4至少还有一部分没有断开，即，第二塑胶件2弯折后不完全断开；此外，弯折部4的厚度小于第一塑胶件1的厚度或第二塑胶件2的厚度，也能实现弯折部4断开。The difference from the first embodiment is that the thickness of the bending part 4 in this embodiment 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 is provided with a breaking line, a breaking groove and a breaking point. At least one of the holes, the bending part 4 is connected or disconnected after the second plastic part 2 is folded. Since the thickness of the bent portion 4 is smaller, it can be bent more easily. Preferably, the thickness of the bent portion 4 is 2-5 mm. The form is disconnected. When the bending part 4 is disconnected, at least a part of the bending part 4 is not disconnected, that is, the second plastic part 2 is not completely disconnected after bending; in addition, the thickness of the bending part 4 is less than The thickness of the first plastic part 1 or the thickness of the second plastic part 2 can also realize the breaking of the bending part 4 .
可替换地，弯折部4也可以设置为折断式，即第二塑胶件2向第一塑胶件1弯折后断开，能够避免由于第一塑胶件1和第二塑胶件2之间的误差累积，导致在两者固定后第二塑胶件2发生变形。Alternatively, the bending part 4 can also be set to be broken, that is, the second plastic part 2 is bent to the first plastic part 1 and then disconnected, which can avoid the The accumulation of errors results in the deformation of the second plastic part 2 after the two are fixed.
其他结构与实施方式一相同，这里不再赘述。Other structures are the same as those in the first embodiment, and are not repeated here.
实施方式六Embodiment 6
与实施方式一不同的是：参照图4，第一塑胶件1一端向外延伸形成 第二塑胶件2。在组装成电池时，只需将一个第二塑胶件2往第一塑胶件1弯折，省去了将弯折另一个第二塑胶件2的步骤，有助于简化生产工序，从而提高生产效率。The difference from the first embodiment is: referring to FIG. 4 , one end of the first plastic part 1 extends outward to form the second plastic part 2 . When assembling a battery, only one second plastic part 2 needs to be bent towards the first plastic part 1, which saves the step of bending another second plastic part 2, which helps to simplify the production process and thus improves the production efficient.
其他结构与实施方式一相同，这里不再赘述。Other structures are the same as those in the first embodiment, and are not repeated here.
实施方式七 Embodiment 7
与实施方式一不同的是：本实施方式的第一塑胶件1沿中部断开成两部分，每部分的至少一端部向外延伸形成第二塑胶件2。具体的，第一塑胶件1沿中部断开成两部分，即第一塑胶件1沿左右方向X分成左右两部分，在防爆阀处分开，左侧部分的第一塑胶件1靠近防爆阀的一侧延伸形成第二塑胶件2，或远离防爆阀一侧延伸形成第二塑胶件2，同时，右侧部分的第一塑胶件1也可按照这种结构形成第二塑胶件2；第一塑胶件1沿中部断开成两部分，使得第一塑胶件1和第二塑胶件2不遮挡防爆阀，因此不需要在第一塑胶件1和第二塑胶件2上设置防爆阀透气孔7，此外，第一塑胶件1分成两部分后，能够避免由于第一塑胶件1和第二塑胶件2之间的误差累积，导致在两者固定后第二塑胶件2发生变形。The difference from the first embodiment is that the first plastic part 1 of this embodiment is broken into two parts along the middle part, 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 two parts along the left and right direction X, which are separated at the explosion-proof valve, and the first plastic part 1 on the left part is close to the explosion-proof valve. One side extends to form the second plastic part 2, or the side away from the explosion-proof valve extends to form the second plastic part 2. Meanwhile, the first plastic part 1 on the right side can also form the second plastic part 2 according to this structure; The plastic part 1 is broken into two parts along the middle part, so that the first plastic part 1 and the second plastic part 2 do not block the explosion-proof valve, so there is no need to set the explosion-proof valve ventilation hole 7 on the first plastic part 1 and the second plastic part 2 , In addition, after the first plastic part 1 is divided into two parts, the error accumulation between the first plastic part 1 and the second plastic part 2 can be avoided, resulting in the deformation of the second plastic part 2 after the two are fixed.
其他结构与实施方式一相同，这里不再赘述。Other structures are the same as those in the first embodiment, and are not repeated here.
实施方式八Embodiment 8
为了实现第一塑胶件1与第二塑胶件2之间更好的装配效果，第一塑胶件1与第二塑胶件2的一端铰接、铆接或超声连接。具体的，参照图5，第一塑胶件1与第二塑胶件2的一端铰接，即，第一塑胶件1与第二塑胶件2之间通过转轴转动连接，转轴可单独设置，第一塑胶件1与第二塑胶件2均设置有转轴孔，转轴也可以一体设置在第一塑胶件1或第二塑胶件2的端部，第一塑胶件1或第二塑胶件2对应的端部设置有转轴孔，满足两者转动连接即可，有助于实现第一塑胶件1与第二塑胶件2之间更好的转动连接，不仅降低转动过程中的阻力，还降低第二塑胶件2在使用过程中发生回弹的概率，第一塑胶件1与第二塑胶件2的一端部也可以超声连接，具体的，通过超声在两者中间热熔为一体，当对热熔处弯折时，因热熔处的强度相对较低，更容易折弯，相当于两者的连接处的厚度较小，即，第二塑胶件2向第一塑胶件1弯折后断开，能够避免由于第一塑胶件1和 第二塑胶件2之间的误差累积，导致在两者固定后第二塑胶件2发生变形的情况。In order to achieve better assembling effect between the first plastic part 1 and the second plastic part 2 , one end of the first plastic part 1 and the second plastic part 2 are hinged, riveted or ultrasonically connected. Specifically, referring to FIG. 5 , one end of the first plastic part 1 and the second plastic part 2 are hinged, that is, the first plastic part 1 and the second plastic part 2 are connected by a rotating shaft. Both the part 1 and the second plastic part 2 are provided with a shaft hole. A shaft hole is provided to satisfy the rotational connection between the two, which helps to achieve a better rotational connection between the first plastic part 1 and the second plastic part 2, which not only reduces the resistance during the rotation process, but also reduces the second plastic part. 2. The probability of springback during use. One end of the first plastic part 1 and the second plastic part 2 can also be ultrasonically connected. When folding, because the strength of the hot melt is relatively low, it is easier to bend, which means that the thickness of the connection between the two is smaller, that is, the second plastic part 2 is bent to the first plastic part 1 and then disconnected, which can This avoids the situation that the second plastic part 2 is deformed after the two are fixed due to the accumulation of errors between the first plastic part 1 and the second plastic part 2 .
实施方式九Embodiment nine
一种顶盖装配结构，包括顶盖片8及如实施方式一到实施方式六的下塑胶件，下塑胶件设置在顶盖片8的底部。A top cover assembly structure includes a top cover sheet 8 and a lower plastic part as in Embodiment 1 to Embodiment 6, and the lower plastic part is arranged at the bottom of the top cover sheet 8 .
需要说明的是：参见图6，电池用于向外部输出电能的极柱有两个，分别为第一极柱、第二极柱，均设置在顶盖片8上，第一极柱可以为正极柱也可以为负极柱，相应地，第二极柱为负极柱或正极柱，第一塑胶件1开设有和顶盖片8的第一极柱、第二极柱对应的通孔，第一塑胶件1和第二塑胶件2起到绝缘顶盖片8和电芯9的作用，还能防止电解液腐蚀顶盖片8，有助于延长电池的使用寿命。It should be noted that: referring to FIG. 6 , the battery has two poles for outputting electric energy to the outside, which are the first pole and the second pole, which are both arranged on the top cover sheet 8 , and the first pole can be The positive pole can also be a negative pole. Correspondingly, the second pole is a negative pole or a positive pole. The first plastic part 1 is provided with through holes corresponding to the first pole and the second pole of the top cover sheet 8 . The first plastic part 1 and the second plastic part 2 play the role of insulating the top cover sheet 8 and the battery core 9, and can also prevent the electrolyte from corroding the top cover sheet 8, which helps to prolong the service life of the battery.
参照图6～8，顶盖片8上设置有注液口81，第二塑胶件2设置有注液网21，注液网21至少覆盖注液口81的垂直投影面，注液网21的网孔的面积小于注液口81的面积。注液网21设有若干个网孔，网孔尺寸小于注液口81的尺寸，注液网21能够在化成过程中，防止注液口81的胶钉从注液口81掉入电芯9内，注液网21至少完整覆盖注液口81下方投影面范围，此外，第一塑胶件1设置与注液口81匹配的注液通孔，注液通孔位于注液网21的正上方。6 to 8, the top cover sheet 8 is provided with a liquid injection port 81, the second plastic part 2 is provided with a liquid injection mesh 21, the liquid injection mesh 21 covers at least the vertical projection surface of the liquid injection port 81, and the liquid injection mesh 21 The area of the mesh is smaller than the area of the liquid injection port 81 . The liquid injection net 21 is provided with several mesh holes, and the size of the mesh holes is smaller than the size of the liquid injection port 81. The liquid injection mesh 21 can prevent the glue nails of the liquid injection port 81 from falling into the battery cell 9 from the liquid injection port 81 during the formation process. Inside, the liquid injection net 21 at least completely covers the range of the projection surface below the liquid injection port 81 . In addition, the first plastic part 1 is provided with a liquid injection through hole matching the liquid injection port 81 , and the liquid injection through hole is located directly above the liquid injection screen 21 . .
注液网21内的网孔可以有三角形孔、圆形孔、方形孔等多种形状的孔组成，多个孔可以按照一定的规则进行排列，形成气体通道，优选采用多个圆形孔组成。The mesh holes in the liquid injection net 21 can be composed of holes of various shapes such as triangular holes, circular holes, square holes, etc. The plurality of holes can be arranged according to certain rules to form gas channels, and it is preferable to use a plurality of circular holes. .
参照图8，注液口81下表面延伸有凸台811，注液网21对应设有保护凸起211，保护凸起211半径大于凸台811半径。注液口81下方伸出有凸台811，第二塑胶件2设有与凸台811对应的保护凸起211，保护凸起211的半径大于凸台811的半径，保护凸起211配合凸台811可以防止化成钉从注液口81落入第一塑胶件1与第二塑胶件2之间的间隙，其中，凸台811可通过冲压顶盖片8的下表面形成。Referring to FIG. 8 , a boss 811 extends from the lower surface of the liquid injection port 81 , and the liquid injection net 21 is correspondingly provided with a protective protrusion 211 , and the radius of the protective protrusion 211 is larger than the radius of the boss 811 . A boss 811 protrudes below the liquid injection port 81 , the second plastic part 2 is provided with a protection boss 211 corresponding to the boss 811 , the radius of the protection boss 211 is larger than the radius of the boss 811 , and the protection boss 211 matches the boss 811 can prevent the formation nails from falling into the gap between the first plastic part 1 and the second plastic part 2 from the liquid injection port 81 , wherein the boss 811 can be formed by punching the lower surface of the top cover sheet 8 .
参照图6，保护凸起211上设有若干个溢流槽2111。为了保证注液效率，防止注液口81堵塞，保护凸起211上设有若干个溢流槽2111，溢流 槽2111保证在第二塑胶件2固定到第一塑胶件1后，保护凸起211和凸台811之间不会形成封闭流道，电解液能够从溢流槽2111流到保护凸起211外侧，保证注液效率。Referring to FIG. 6 , the protective protrusion 211 is provided with a plurality of overflow grooves 2111 . In order to ensure the liquid injection efficiency and prevent the liquid injection port 81 from being blocked, a plurality of overflow grooves 2111 are provided on the protective protrusion 211. The overflow grooves 2111 ensure that after the second plastic part 2 is fixed to the first plastic part 1, the protective protrusion A closed flow channel will not be formed between 211 and the boss 811, and the electrolyte can flow from the overflow groove 2111 to the outside of the protection protrusion 211 to ensure the injection efficiency.
顶盖片8和第一塑胶件1至少一者设置有热熔柱和/或热熔槽，顶盖片8和第一塑胶件1热熔接。具体的，在顶盖片8或第一塑胶件1上设置至少一个热熔柱，顶盖片8或第一塑胶件1对应的位置设置热熔槽，通过热熔连接方式，将顶盖片8和第一塑胶件1固定在一起，有助于防止塑胶起翘，还有助于提高顶盖片8和第一塑胶件1之间的稳固性，还不会占用电池的内部空间，从而给电极组件预留更多的空间，提高电池的能量密度。At least one of the top cover sheet 8 and the first plastic part 1 is provided with a hot melt column and/or a hot melt groove, and the top cover sheet 8 and the first plastic part 1 are thermally welded. Specifically, at least one hot-melt column is set on the top cover sheet 8 or the first plastic part 1, and a hot-melt groove is set at the corresponding position of the top cover sheet 8 or the first plastic part 1, and the top cover sheet is connected by hot-melt connection. 8 and the first plastic part 1 are fixed together, which helps to prevent the plastic from warping, and also helps to improve the stability between the top cover sheet 8 and the first plastic part 1, and does not occupy the internal space of the battery, so Reserve more space for the electrode assembly to improve the energy density of the battery.
实施方式十Embodiment ten
参照图9，一种动力电池，包括电芯9、容纳电芯9的电池壳体，以及密封安装在电池壳体上的顶盖片8，电芯9与顶盖片8之间设置有实施方式一到实施方式六的下塑胶件，电芯9的极耳固定在第一塑胶件1与第二塑胶件2之间。Referring to FIG. 9 , a power battery includes a battery cell 9 , a battery case accommodating the battery cell 9 , and a top cover sheet 8 sealed and mounted on the battery case. In the lower plastic parts of the first to sixth embodiments, the tabs of the battery cells 9 are fixed between the first plastic part 1 and the second plastic part 2 .
顶盖片8开设有和第一极柱、第二极柱对应的安装孔，第一极柱、第二极柱套设有密封件，且第一塑胶件1开设有和顶盖片8的第一极柱、第二极柱对应的通孔，密封件和第一塑胶件1均起到绝缘顶盖片8和极柱的作用，电池内的电芯9连接有第一极耳与第二极耳，采用激光焊接的方式，将第一极耳与第一极柱连接，第二极耳与第二极柱连接，其中，电芯9内的正极片、隔膜及负极片可以顺序堆叠并卷绕，正极片包括正极集流体，以及涂覆于正极集流体表面的正极活性材料，负极片包括负极集流体，以及涂覆于负极集流体表面的负极活性材料。第一极耳连接于正极集流体，第二极耳连接于负极集流体，正极集流体的边缘处可具有未被正极活性材料覆盖的空白区，第一极耳可直接通过裁切空白区形成。同样的，第二极耳可直接通过裁切负极集流体的空白区，此外，第一极耳和第二极耳也可以通过焊接分别固定于正极片和负极片的空白区。The top cover sheet 8 is provided with mounting holes corresponding to the first pole post and the second pole post, the first pole post and the second pole post are sleeved with sealing members, and the first plastic part 1 is provided with the top cover sheet 8 . The through holes corresponding to the first pole and the second pole, the sealing member and the first plastic part 1 all play the role of the insulating top cover 8 and the pole. The cell 9 in the battery is connected with the first pole and the second pole. Diode tabs, the first tab is connected to the first pole, and the second tab is connected to the second pole by means of laser welding, wherein the positive electrode sheet, the diaphragm and the negative electrode sheet in the battery core 9 can be stacked in sequence and winding, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material coated on the surface of the positive electrode current collector, and the negative electrode sheet includes a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector. The first tab is connected to the positive electrode current collector, the second tab is connected to the negative electrode current collector, the edge of the positive electrode current collector may have a blank area not covered by the positive active material, and the first tab can be directly formed by cutting the blank area . Similarly, the second tab can be directly cut through the blank area of the negative electrode current collector. In addition, the first tab and the second tab can also be fixed to the blank area of the positive electrode sheet and the negative electrode sheet respectively by welding.
电池内电芯9数量较多或极耳较短时，在装配过程中会使用转接片，转接片包括第一转接片和第二转接片。第一极耳通过第一转接片与第一极柱连接。第二极耳均通过第二转接片与第二极柱连接，实现了提高电池内 部有序连接。When the number of cells 9 in the battery is large or the tabs are short, an adapter sheet is used in the assembly process, and the adapter sheet includes a first adapter sheet and a second adapter sheet. The first tab is connected to the first pole through the first adapter. The second tabs are all connected with the second poles through the second transfer piece, so as to improve the orderly connection inside the battery.
根据上述说明书的揭示和教导，本发明所属领域的技术人员还能够对上述实施方式进行变更和修改。因此，本发明并不局限于上述的具体实施方式，凡是本领域技术人员在本发明的基础上所作出的任何显而易见的改进、替换或变型均属于本发明的保护范围。此外，尽管本说明书中使用了一些特定的术语，但这些术语只是为了方便说明，并不对本发明构成任何限制。Based on the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above-described embodiments. Therefore, the present invention is not limited to the above-mentioned specific embodiments, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention falls within the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims (10)

  1. 一种动力电池用下塑胶件，其特征在于，包括：A lower plastic part for a power battery, characterized in that it includes:
    第一塑胶件(1)，用于间隔电池电芯(9)与顶盖片(8)；a first plastic part (1) for separating the battery cells (9) and the top cover sheet (8);
    第二塑胶件(2)，与所述第一塑胶件(1)连接；The second plastic part (2) is connected with the first plastic part (1);
    其中，所述下塑胶件具有安装状态和预安装状态，其中，当处于所述安装状态时，所述第二塑胶件(2)运动至所述第一塑胶件(1)同向位置处。Wherein, the lower plastic part has an installed state and a pre-installed state, wherein when in the installed state, the second plastic part (2) moves to the same position of the first plastic part (1).
  2. 如权利要求1所述的一种动力电池用下塑胶件，其特征在于：所述第一塑胶件(1)的至少一端部向外延伸形成所述第二塑胶件(2)，或所述第一塑胶件(1)在其两个端部之间的任意一处向外延伸形成所述第二塑胶件(2)。The lower plastic part for a power battery according to claim 1, characterized in that: at least one end of the first plastic part (1) extends outward to form the second plastic part (2), or the The second plastic part (2) is formed by extending the first plastic part (1) outward at any place between its two ends.
  3. 如权利要求1所述的一种动力电池用下塑胶件，其特征在于：所述第一塑胶件(1)与所述第二塑胶件(2)的一端铰接、铆接或超声连接，所述第二塑胶件(2)的另一端翻转后与所述第一塑胶件(1)固定连接，固定连接方式包括以下至少之一：卡接、粘接、热熔接和超声连接。A lower plastic part for a power battery according to claim 1, characterized in that: the first plastic part (1) and one end of the second plastic part (2) are hinged, riveted or ultrasonically connected; After the other end of the second plastic part (2) is turned over, it is fixedly connected to the first plastic part (1), and the fixed connection method includes at least one of the following: clamping, bonding, heat welding and ultrasonic connection.
  4. 如权利要求1所述的一种动力电池用下塑胶件，其特征在于：所述第一塑胶件(1)和所述第二塑胶件(2)之间设置有弯折部(4)，所述第二塑胶件(2)可沿所述弯折部(4)向所述第一塑胶件(1)折叠，所述弯折部(4)在所述第二塑胶件(2)折叠后完全断开或至少一处连接。A lower plastic part for a power battery according to claim 1, characterized in that a bending part (4) is arranged between the first plastic part (1) and the second plastic part (2), The second plastic part (2) can be folded toward the first plastic part (1) along the bending part (4), and the bending part (4) is folded at the second plastic part (2) completely disconnected or at least one connection.
  5. 如权利要求1所述的一种动力电池用下塑胶件，其特征在于：所述第二塑胶件(2)沿前后两侧边缘设置有向上倾斜的倾斜面(5)，所述倾斜面(5)为平面或下凸曲面。A lower plastic part for a power battery according to claim 1, characterized in that: the second plastic part (2) is provided with upwardly inclined inclined surfaces (5) along the edges of the front and rear sides, and the inclined surfaces ( 5) is a plane or a downward convex surface.
  6. 如权利要求1所述的一种动力电池用下塑胶件，其特征在于：所述第一塑胶件(1)沿中部断开成两部分，每部分的至少一端部向外延伸形成所述第二塑胶件(2)。The lower plastic part for a power battery according to claim 1, wherein the first plastic part (1) is broken into two parts along the middle part, and at least one end of each part extends outward to form the first plastic part (1). Two plastic parts (2).
  7. 如权利要求1所述的一种动力电池用下塑胶件，其特征在于：所述第二塑胶件(2)和所述电芯(9)顶面的接触的面积与所述电芯(9)顶面的总面积之比大于50％。A lower plastic part for a power battery according to claim 1, characterized in that: the contact area between the second plastic part (2) and the top surface of the battery cell (9) is the same as that of the battery core (9). ) the ratio of the total area of the top surface is greater than 50%.
  8. 如权利要求1所述的一种动力电池用下塑胶件，其特征在于：所述第一塑胶件(1)和所述第二塑胶件(2)至少一者的材质为PPS和/或PP。A lower plastic part for a power battery according to claim 1, characterized in that: at least one of the first plastic part (1) and the second plastic part (2) is made of PPS and/or PP .
  9. 一种顶盖装配结构，其特征在于：包括顶盖片(8)及如权利要求1～ 9任意一项所述的下塑胶件，所述下塑胶件设置在所述顶盖片(8)的底部，所述顶盖片(8)上设置有注液口(81)，第二塑胶件(2)设置有注液网(21)，所述注液口(81)下表面延伸有凸台(811)，所述注液网(21)对应设置有保护凸起(211)，所述保护凸起(211)上设有若干个溢流槽(2111)。A top cover assembly structure, characterized in that it comprises a top cover sheet (8) and the lower plastic part according to any one of claims 1 to 9, wherein the lower plastic part is arranged on the top cover sheet (8) The bottom of the top cover sheet (8) is provided with a liquid injection port (81), the second plastic part (2) is provided with a liquid injection net (21), and the lower surface of the liquid injection port (81) extends with a convex A stage (811), the liquid injection net (21) is correspondingly provided with a protection protrusion (211), and a plurality of overflow grooves (2111) are provided on the protection protrusion (211).
  10. 一种动力电池，包括电芯(9)、容纳所述电芯(9)的电池壳体，以及密封安装在所述电池壳体上的顶盖片(8)，其特征在于：所述电芯(9)与所述顶盖片(8)之间设置有权利要求1～9任意一项所述的下塑胶件，所述电芯(9)的极耳固定在第一塑胶件(1)与第二塑胶件(2)之间。A power battery, comprising a battery cell (9), a battery case accommodating the battery cell (9), and a top cover sheet (8) sealingly mounted on the battery case, characterized in that: the battery The lower plastic part according to any one of claims 1 to 9 is arranged between the core (9) and the top cover sheet (8), and the tabs of the battery core (9) are fixed on the first plastic part (1). ) and the second plastic part (2).
PCT/CN2021/090160 2020-07-08 2021-04-27 Lower plastic member for power battery, top cover assembly structure, and power battery WO2022007481A1 (en)

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