WO2021233080A1 - 端盖组件、电池单体、电池组、装置及注液方法 - Google Patents

端盖组件、电池单体、电池组、装置及注液方法 Download PDF

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Publication number
WO2021233080A1
WO2021233080A1 PCT/CN2021/089810 CN2021089810W WO2021233080A1 WO 2021233080 A1 WO2021233080 A1 WO 2021233080A1 CN 2021089810 W CN2021089810 W CN 2021089810W WO 2021233080 A1 WO2021233080 A1 WO 2021233080A1
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WO
WIPO (PCT)
Prior art keywords
nail body
wall
end cover
end cap
cap assembly
Prior art date
Application number
PCT/CN2021/089810
Other languages
English (en)
French (fr)
Inventor
黄守君
陈新祥
郑于炼
王鹏
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP21809126.2A priority Critical patent/EP4030553A4/en
Priority to KR1020227023192A priority patent/KR20220113748A/ko
Priority to JP2022541653A priority patent/JP7446437B2/ja
Publication of WO2021233080A1 publication Critical patent/WO2021233080A1/zh
Priority to US17/721,384 priority patent/US20220238945A1/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
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

  • This application relates to the technical field of energy storage equipment, and in particular to an end cover assembly, a battery cell, a battery pack, a device, and a liquid injection method.
  • lithium-ion battery cells have extremely high requirements on the sealing of the structure.
  • the electrolyte is not allowed to leak out during use, otherwise it will pollute the surrounding air and environment.
  • impurities such as water vapor are not allowed to enter the battery pack, which reduces the battery life.
  • the embodiments of the present application provide an end cover assembly, a battery cell, a battery pack, a device, and a liquid injection method, aiming to improve the sealing performance of the end cover assembly.
  • the end cover assembly includes: an end cover plate including a through hole for injecting electrolyte and a fixing part arranged around the through hole; a nail body, It includes an accommodating part for accommodating the fixing part.
  • the accommodating part is ring-shaped and includes two inner walls spaced apart in the radial direction. The inner and outer walls of the fixing part are press-fitted with the two inner walls of the nail body to seal the through hole. .
  • the nail body includes a cylinder for sealing the through hole and a cap connected to one end of the cylinder.
  • the cap includes a convex portion arranged around the cylinder. Press fit with the inner wall of the fixed part, and press fit with the convex part and the outer wall of the fixed part.
  • the end cap assembly further includes a sealing element, which is arranged between the nail body and the fixing part, so as to realize the press fit of the nail body and the fixing part.
  • the column and the convex part respectively form two side walls of the receiving part, and the column and the convex part provide the fixed part with two limits, so that the force of the fixed part is more balanced, and the sealing performance of the end cover assembly can be improved.
  • the end cap assembly further includes a sealing element, which is arranged between the nail body and the fixing part, so as to realize the press fit of the nail body and the fixing part.
  • a sealing element which is arranged between the nail body and the fixing part, so as to realize the press fit of the nail body and the fixing part.
  • the sealing element includes a first sealing element, which is sleeved between the cylinder and the inner wall of the fixing part.
  • a first accommodating groove is provided on the inner wall of the column and/or the fixing portion, so that the first sealing member is located in the first accommodating groove.
  • the first sealing element may be located in the first accommodating groove, and the first sealing element can be provided with a limit through the first accommodating groove, preventing the first sealing element from being misaligned, and ensuring that the first sealing element and the fixing part and/or the nail body Stability of relative position.
  • the sealing element includes a second sealing element, which is sleeved between the outer wall of the fixed part and the convex part.
  • a second accommodating groove is provided on the outer wall and/or the convex portion of the fixing portion, so that the second sealing member is located in the second accommodating groove.
  • the second sealing element can be located in the second accommodating groove, and the second sealing element can be provided with a limit through the second accommodating groove, preventing the second sealing element from being misaligned, and ensuring the second sealing element and the fixing part and/or the nail body Stability of relative position.
  • the seal includes an annular wall portion
  • the cross-section of the ring-shaped wall is circular; the ring-shaped wall with the circular cross-section makes the nail body receive less resistance when it is pressed into the through hole, and is easy to assemble.
  • the cross section of the ring-shaped wall portion is rectangular, so that the sealing member is arranged in surface contact with the fixing portion and/or the nail body.
  • the surface-to-surface contact between the sealing element and the fixing part and/or the nail body can increase the contact area between the sealing element and the fixing part and/or the nail body, and improve the sealing performance of the end cover assembly.
  • the end cap assembly further includes a locking component, which has a ring structure and is configured to be sleeved and locked outside the cap, so that the nail body and the fixing portion are press-fitted.
  • a locking component By providing the locking component, a force can be applied from the nail body to the nail body and the fixing part to ensure the tightness of the mutual cooperation of the nail body and the fixing part.
  • the fixing portion protrudes from the surface of the end cap.
  • the nail body cooperates with the fixing part, and the fixing part protrudes from the surface of the end cover plate so that at least a part of the nail body protrudes from the surface of the end cover plate to facilitate the removal or installation of the nail body.
  • the surface of the end cover plate is recessed to form a sinking platform, and the fixing part is connected to the bottom surface of the sinking platform.
  • the flatness of the outer surface of the end cover plate can be ensured, and the space occupied by the end cover assembly can be reduced.
  • an embodiment of the present application also provides a battery cell, which includes: a casing having an opening, and the above-mentioned end cover assembly is used to seal the opening.
  • an embodiment of the present application also provides a battery pack, including: the above-mentioned battery cell, and a box for accommodating the battery cell.
  • an embodiment of the present application also provides a device, including the above-mentioned battery cell, and the battery cell is used to provide electrical energy.
  • an embodiment of the present application also provides a method for injecting a battery cell.
  • the method includes:
  • the nail body is sealed in the liquid injection hole, so that the fixing part is accommodated in the annular accommodating part of the nail body, and the inner and outer side walls of the fixing part are press-fitted with the inner wall of the accommodating part.
  • the end cover assembly includes an end cover plate and a nail body, the end cover plate is provided with a through hole, and the nail body is used to seal the through hole.
  • the outer circumference of the through hole is provided with a fixing part, and the nail body is matched with the fixing part and the inner wall of the through hole to increase the contact area between the nail body and the end cover plate, thereby improving the sealing effect.
  • the nail body includes a ring-shaped receiving portion, and two inner walls of the ring-shaped receiving portion can be press-fitted with the inner wall and the outer wall of the fixing portion.
  • the ring-shaped accommodating portion can provide the fixing portion with two limits to balance the force of the fixing portion, which not only prevents the fixing portion from tilting and deformation, but also increases the contact area between the nail body and the fixing portion, and improves the sealing effect.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a battery pack provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a battery module provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a battery cell provided by an embodiment of the present application.
  • Figure 5 is a perspective view of an end cap assembly provided by an embodiment of the present application.
  • Figure 6 is a top view of an end cap assembly provided by an embodiment of the present application.
  • Figure 7 is a cross-sectional view at A-A in Figure 6;
  • FIG. 8 is a schematic diagram of a partial enlarged structure at I in FIG. 7 in an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a partial enlarged structure at I in FIG. 7 in another embodiment of the present application.
  • FIG. 10 is a schematic diagram of a partial enlarged structure at I in FIG. 7 in still another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a first sealing member of an end cover assembly provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a second sealing member of an end cap assembly provided by an embodiment of the present application.
  • Figure 13 is a top view of an end cap assembly provided by another embodiment of the present application.
  • Figure 14 is a cross-sectional view at B-B in Figure 13;
  • FIG. 15 is a partial enlarged schematic diagram of the structure at II in FIG. 14;
  • 16 is a schematic structural diagram of a nail body of an end cap assembly provided by an embodiment of the present application.
  • Figure 17 is a cross-sectional view at C-C in Figure 16;
  • FIG. 18 is a schematic structural diagram of a locking portion of an end cover assembly provided by an embodiment of the present application.
  • Figure 19 is a cross-sectional view at D-D in Figure 18;
  • FIG. 20 is a flowchart of a method for injecting a battery cell according to an embodiment of the present application.
  • the seal is usually sealed in the injection port by plugging and unplugging.
  • Lithium ions may produce gas during use, which may cause deformation of the lithium-ion battery casing, and the liquid injection port is flush with other parts of the casing, and the portion on the casing corresponding to the liquid injection port has a large deformation and is sealed. The parts may be displaced with the deformation of the shell, and eventually lead to failure of the seal of the liquid injection port.
  • FIG. 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application.
  • the vehicle includes a battery pack 1 and a vehicle body 2, and the battery pack 1 is provided on the vehicle body 2.
  • the vehicle is a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle.
  • the vehicle main body 2 is provided with a driving motor, which is electrically connected to the battery pack 1, and the battery pack 1 provides electric energy.
  • the driving motor is connected to the wheels on the vehicle main body 2 through a transmission mechanism to drive the vehicle.
  • the battery pack 1 may be horizontally arranged at the bottom of the vehicle body 2.
  • FIG. 2 is a schematic structural diagram of a battery pack 1 provided by an embodiment of the present application.
  • the battery pack 1 includes a box body 12 and a battery module 11 disposed in the box body 12.
  • the number of battery modules 11 may be one or more. When there are multiple battery modules 11, the plurality of battery modules 11 are arranged in the box 12 in a row. There are many types of the box 12.
  • the box 12 may be a frame-shaped box, a disk-shaped box, or a box-shaped box. Specifically, the box 12 may include a lower box for accommodating battery modules and a lower box. The upper box with the lid closed.
  • FIG. 3 is a schematic structural diagram of a battery module 11 provided by an embodiment of the present application.
  • the battery module 11 includes a receiving portion 20 and a plurality of battery cells 10 located in the receiving portion 20, and the plurality of battery cells 10 are arranged side by side in the receiving portion 20.
  • the accommodating part 20 can be arranged in many ways.
  • the accommodating part 20 includes a housing and a cover plate provided at the housing; or, the accommodating part 20 includes side plates and end plates that are successively enclosed and connected; or, the accommodating part includes oppositely arranged The end plate and the strap surrounding the end plate and the battery cell; or, as shown in FIG. 3, the receiving portion 20 includes a side plate, an end plate and a strap.
  • the battery cell 10 can be used not only in vehicles but also in other devices.
  • the embodiment of the present application also provides a device that uses the battery cell 10 as a power source.
  • the device can be, but is not limited to, a vehicle, a ship, or an aircraft.
  • FIG. 4 is a schematic structural diagram of a battery cell 10 according to an embodiment of the present application.
  • the battery cell 10 includes a housing 200 with an opening and an end cover assembly 100 covering the housing 200.
  • An electrode assembly 300 is also provided in the housing 200 of the battery cell 10.
  • the housing 200 is provided with electrolyte
  • the end cap assembly 100 is provided with a through hole 111 used as a liquid injection port and a nail body 120 for sealing the through hole 111.
  • the electrolyte can be injected into the housing 200 through the through hole 111, and the through hole 111 can be sealed through the nail body 120.
  • FIG. 5 is an isometric view of an end cap assembly 100 provided by an embodiment of the present application.
  • FIG. 6 is a top view of an end cap assembly 100 provided by an embodiment of the present application.
  • Fig. 7 is a cross-sectional view at A-A in Fig. 6.
  • the end cap assembly 100 includes: an end cap plate 110, including a through hole 111 for injecting electrolyte and a fixing portion 112 arranged around the through hole 111; a nail body 120, including
  • the accommodating part for accommodating the fixing part 112 is ring-shaped and includes two inner walls spaced apart in the radial direction. The inner wall and the outer wall of the fixing part 112 are press-fitted with the two inner walls of the nail body 120 to seal the through hole. 111.
  • the above-mentioned end cap assembly 100 can not only be used in the battery cell 10 to cover the opening of the housing 200 of the battery cell 10, but also can be used to cover the opening of other devices.
  • the inner wall of the fixing portion 112 refers to the inner wall surface of the fixing portion 112 facing the through hole 111, and the outer wall of the fixing portion 112 refers to the outer wall surface of the fixing portion 112 away from the through hole 111.
  • the accommodating portion includes an accommodating space for accommodating the fixing portion 112, and the inner wall of the accommodating portion refers to an inner wall surface of the accommodating portion facing the accommodating space.
  • the end cover assembly 100 includes an end cover plate 110 and a nail body 120, the end cover plate 110 is provided with a through hole 111, and the nail body 120 is used to seal the through hole 111.
  • a fixing portion 112 is provided on the outer periphery of the through hole 111, and the nail body 120 cooperates with the fixing portion 112 and the inner wall of the through hole 111 to increase the contact area between the nail body 120 and the end cover plate 110, thereby improving the sealing effect.
  • the fixing portion 112 is arranged around the through hole 111 and protrudes relative to other parts of the end cover plate 110.
  • the nail body 120 includes a ring-shaped receiving portion, and two inner walls of the ring-shaped receiving portion can be press-fitted with the inner wall and the outer wall of the fixing portion 112. That is to say, the ring-shaped receiving portion can provide the fixed portion 112 with a limit in two directions, so that the fixed portion 112 is balanced in force.
  • the fixing portion 112 be prevented from tilting and deformation, but also the contact area of the nail body 120 and the fixing portion 112 can be increased, and the displacement of the nail body 120 along with the deformation of the top cover 110 can be avoided, and the sealing effect can be improved.
  • the battery cell 10 may generate gas during use, so that the end cap assembly 100 may be convexly deformed. Since the fixing portion 112 is arranged around the through hole 111, the mating distance between the nail body 120 and the end cover plate 110 in the thickness direction thereof can be increased. When the end cap assembly 100 is deformed convexly, the transmission distance of the deformation can be increased, making it difficult for the deformation to be transmitted to the fixing portion 112, and ensuring the tightness of the nail body 120 and the fixing portion 112.
  • the nail body 120 and the through hole 111 of the end cover assembly 100 are closely matched, the nail body 120 can be matched with the through hole 111 and the fixing portion 112 by interference fit, so that the nail body 120 is detachably disposed on the end cover plate 110.
  • the nail body 120 can be removed to facilitate the secondary injection of the battery cell 10.
  • FIG. 8 is a schematic diagram of a partially enlarged structure at I in FIG. 7
  • FIG. 9 is a schematic diagram of a partially enlarged structure at I in FIG. 7 in another embodiment of the present application.
  • the fixing portion 112 may directly protrude from the surface of the end cover 110.
  • the fixing portion 112 protrudes from the surface of the end cover plate 110, and the nail body 120 and the fixing portion 112 cooperate, so that at least part of the nail body 120 protrudes from the surface of the end cover plate 110, which is convenient for setting the nail body 120. Perform removal or installation actions.
  • the surface of the end cover plate 110 is recessed to form a sinking platform 113, and the fixing portion 112 is connected to the bottom surface 113 a of the sinking platform 113.
  • the fixing portion 112 is located in the sinking platform 113, which can ensure the flatness of the outer surface of the end cover plate 110 and reduce the space occupied by the end cover assembly 100.
  • the nail body 120 when the nail body 120 is sealed in the through hole 111, the nail body 120 is located in the sinking table 113, which can reduce the space occupied by the end cap assembly 100.
  • the material of the nail body 120 includes one of steel, aluminum or other hard metal materials, or the material of the nail body 120 includes engineering plastics or the like.
  • the nail body 120 includes a cylinder 121 and a cap 122 connected to one end of the cylinder 121.
  • the cylinder 121 is used to seal the through hole 111.
  • the cap 122 includes a surrounding cylinder.
  • the convex portion 123 provided in the 121 makes a ring-shaped receiving portion formed between the convex portion 123 and the column 121.
  • the column 121 is press-fitted with the inner wall of the fixing portion 112, and the convex portion 123 is press-fitted with the outer wall of the fixing portion 112.
  • the column 121 and the convex portion 123 respectively form the two inner walls of the accommodating portion, and the column 121 and the convex portion 123 provide the fixing portion 112 with restraints in two directions, so that the fixing portion 112 is more balanced in force. , The sealing performance of the end cover assembly 100 can be improved.
  • the end cap assembly 100 further includes a sealing element 130, which is disposed between the nail body 120 and the fixing portion 112 to realize the nail body 120 and the fixing portion 112. 112's press fit.
  • the sealing member 130 is provided so that the nail body 120 and the fixing portion 112 can be interference fit, and the sealing performance of the end cap assembly 100 is improved.
  • the sealing member 130 includes a first sealing member 130a, which is sleeved between the cylinder 121 and the inner wall of the fixing portion 112, so that the cylinder 121 It fits tightly with the fixing portion 112.
  • first sealing member 130a By providing the first sealing member 130a, the cylinder 121 and the fixing portion 112 can be interference fit, and the sealing performance of the end cover assembly 100 is improved.
  • the column 121 and/or the fixing portion 112 is provided with a first accommodating groove (not shown in the figure), so that the first sealing member 130a can be located in the first accommodating groove.
  • the first sealing element 130a may be located in the first accommodating groove, and the first sealing element 130a can be provided with a limit through the first accommodating groove, so as to prevent the first sealing element 130a from being misaligned and ensure the first sealing The stability of the relative position of the piece 130a, the fixing portion 112 and/or the nail body 120.
  • the sealing member 130 further includes a second sealing member 130b, which is sleeved between the outer wall of the fixing portion 112 and the convex portion 123, so that the convex portion 123 and the fixing portion 112 are closely matched.
  • the convex portion 123 and/or the fixing portion 112 is provided with a second accommodating groove (not shown in the figure), so that the second sealing member 130b can be located in the second accommodating groove.
  • the second sealing element 130b may be located in the second accommodating groove, and the second sealing element 130b can be provided with a limit through the second accommodating groove, preventing the second sealing element 130b from being misaligned and ensuring the second sealing The stability of the relative position of the piece 130b, the fixing portion 112 and/or the nail body 120.
  • the sealing member 130 includes a first sealing member 130a and a second sealing member 130b, so that the cylinder 121 and the fixing portion 112 can be tightly matched, and the convex portion 123 and the fixing portion 112 can also be tightly matched to ensure the fixing portion 112 is balanced in force and improves the sealing performance of the end cap assembly 100.
  • the shape of the sealing member 130 is not limited. In some embodiments, please refer to FIG. 9 continuously.
  • the sealing member 130 includes an annular wall portion 131, and the cross section of the annular wall portion 131 is circular.
  • the cross section of the annular wall portion 131 is a surface perpendicular to the radial direction of the seal 130. In these embodiments, the annular wall portion 131 with a circular cross-section makes the nail body 120 less resistant when it is pressed into the through hole 111, and is easy to assemble.
  • the cross section of the annular wall portion 131 is rectangular, so that the sealing member 130 is connected to the fixing portion 112 and/or the nail body 120 in surface-to-surface contact.
  • the surface-to-surface contact between the sealing member 130 and the fixing portion 112 and/or the nail body 120 can increase the contact area between the sealing member 130 and the fixing portion 112 and/or the nail body 120 and improve the sealing performance of the end cover assembly 100.
  • the cross-section of the first sealing member 130a and the cross-sectional shape of the second sealing member 130b may be the same, that is, the first sealing member 130a and the second sealing member 130b
  • the cross-sections are round or rectangular.
  • the cross-sectional shapes of the first sealing member 130a and the second sealing member 130b are different, that is, the cross-section of one of the first sealing member 130a and the second sealing member 130b is circular, and the other is rectangular.
  • the material of the sealing member 130 may include at least one of rubber and foam. As long as the sealing element 130 has a certain degree of elasticity, so that the nail body 120 and the fixing portion 112 can be interference fit through the sealing element 130.
  • the end cover assembly 100 further includes a locking member 140, the locking member 140 is a ring structure, and the locking member 140 is configured to be locked to the end cover plate 110 In addition, so that the nail body 120 and the fixing portion 112 are press-fitted.
  • the nail body 120 can apply a force to the nail body 120 and the fixing portion 112 to ensure the tightness of the nail body 120 and the fixing portion 112 with each other.
  • the locking member 140 has a wall 141 and a hollow space enclosed by the wall 141.
  • the size of the hollow space is adjustable so that the locking member 140 can be locked. Tighten the nail body 120 and the fixing portion 112.
  • the wall portion 141 has elasticity, and the nail body 120 and the fixing portion 112 are locked by the elastic deformation of the wall portion 141.
  • the wall 141 is provided with a notch 142 communicating with the hollow space, so that the locking portion 140 is not a closed ring, and the nail body 120 and the fixing portion 112 are locked by adjusting the size of the notch 142.
  • the wall portion 141 has a connecting portion 143 at both ends of the notch 142, the connecting portion 143 has through holes therethrough, and the two through holes at both ends of the notch 142 can be connected to each other by an intermediate connector.
  • the end cover assembly 100 further includes a sol, which is disposed on the end cover plate 110 and used to connect the nail body 120 and the end cover plate 110.
  • the sol can cover the nail body 120, which can further ensure the stability of the relative position between the nail body 120 and the end cover plate 110.
  • the soluble soluble material is made of, for example, a fusible material.
  • FIG. 20 is a liquid injection method of the battery cell 10 according to the second embodiment of the present application.
  • the battery cell 10 may be the battery cell 10 in any of the above embodiments.
  • the liquid injection method includes:
  • Step S1 Inject electrolyte through the through hole on the end cover plate of the end cover assembly of the battery cell.
  • Step S2 sealing the nail body in the through hole, so that the fixing part is accommodated in the accommodating part having a ring shape on the nail body, and the inner and outer side walls of the fixing part are press-fitted with the inner wall of the accommodating part.
  • the electrolyte is first injected into the battery cell 10 through the through hole 111, and then the nail body 120 is sealed in the through hole 111, and the inner and outer side walls of the fixing portion 112 are in contact with the inner wall of the receiving portion.
  • the ring-shaped receiving portion can provide the fixing portion 112 with a limit in two directions, so that the fixing portion 112 is balanced in force, which can not only prevent the fixing portion 112 from tilting and deform, but also increase the contact between the nail body 120 and the fixing portion 112 Area to improve the sealing effect.
  • the liquid injection method further includes: pulling the nail body 120 out of the through hole 111, injecting the electrolyte through the through hole 111, and The nail body 120 is sealed in the through hole 111 again. Furthermore, the secondary injection of the battery cell 10 is realized.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
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  • Manufacturing & Machinery (AREA)
  • Filling, Topping-Up Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种端盖组件（100）、电池单体（10）、电池组（1）、装置及注液方法，端盖组件（100）包括：端盖板（110），包括用于注入电解液的通孔（111）及环绕通孔（111）设置的固定部（112）；钉体（120），包括用于收容固定部（112）的容纳部，容纳部呈环状并包括在其径向上分隔设置的两个内壁，固定部（112）的内壁及外壁分别与钉体（120）的两个内壁抵压配合，以密封通孔（111）。环状容纳部可以向固定部（112）提供两个方向上的限位，使得固定部（112）受力平衡，不仅可以防止固定部（112）倾斜变形，还可以增加钉体（120）和固定部（112）的接触面积，提高密封效果。

Description

端盖组件、电池单体、电池组、装置及注液方法
相关申请的交叉引用
本申请要求享有于2020年05月19日提交的名称为“端盖组件、电池单体、电池组、装置及注液方法”的中国专利申请202010426530.8的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及储能设备技术领域，尤其涉及一种端盖组件、电池单体、电池组、装置及注液方法。
背景技术
随着电动汽车技术的日益完善，电动汽车离人们的生活越来越近，同时电动汽车对其提供能量的电池的性能要求越来越高。
由于锂离子电池单体对结构的封闭性要求极高。在使用过程中不允许电解液外渗，否则污染周围空气和环境。同时也不允许水汽等杂质进入电池组内部，降低电池单体寿命。
发明内容
本申请实施例提供一种端盖组件、电池单体、电池组、装置及注液方法，旨在可以提高端盖组件密封性能。
本申请实施例一方面提供了一种用于电池单体的端盖组件，端盖组件包括：端盖板，包括用于注入电解液的通孔及环绕通孔设置的固定部；钉体，包括用于收容固定部的容纳部，容纳部呈环状并包括在其径向上分隔设置的两个内壁，固定部的内壁及外壁分别与钉体的两个内壁抵压配合，以密封通孔。
在一些实施例中，钉体包括用于密封通孔的柱体及连接于柱体一端的盖帽，盖帽包括环绕柱体设置的凸部，凸部和柱体围合形成容纳部，且柱体与固定部的内壁抵压配合，凸部与固定部的外壁抵压配合。
在一些实施例中，端盖组件还包括密封件，密封件设置于钉体和固定部之间，以实现钉体与固定部的抵压配合。柱体和凸部分别形成容纳部的两个侧壁，柱体和凸 部向固定部提供两个方向上的限位，使得固定部受力更加平衡，可以提高端盖组件的密封性能。
在一些实施例中，端盖组件还包括密封件，密封件设置于钉体和固定部之间，以实现钉体与固定部的抵压配合。通过设置密封件可以使得钉体和固定部过盈配合，提高端盖组件的密封性能。
在一些实施例中，密封件包括第一密封件，套设于柱体和固定部内壁之间。通过设置第一密封件使得柱体和固定部可以过盈配合，提高端盖组件的密封性能。
在一些实施例中，柱体和/或固定部内壁上设置有第一容置槽，以使第一密封件位于第一容置槽。第一密封件可以位于第一容置槽内，通过第一容置槽可以向第一密封件提供限位，防止第一密封件发生错位，保证第一密封件与固定部和/或钉体相对位置的稳定性。
在一些实施例中，密封件包括第二密封件，套设于固定部外壁和凸部之间。通过设置第二密封件使得凸部和固定部可以过盈配合，提高端盖组件的密封性能。
在一些实施例中，固定部外壁和/或凸部上设置有第二容置槽，以使第二密封件位于第二容置槽。第二密封件可以位于第二容置槽内，通过第二容置槽可以向第二密封件提供限位，防止第二密封件发生错位，保证第二密封件与固定部和/或钉体相对位置的稳定性。
在一些实施例中，密封件包括环状壁部；
环状壁部的截面呈圆形；截面呈圆形的环状壁部使得钉体压入通孔内时受到的阻力较小，装配方便。
或者，环状壁部的截面呈矩形，以使密封件与固定部和/或钉体面面接触设置。密封件与固定部和/或钉体面面接触，可以增加密封件和固定部和/或钉体的接触面积，提高端盖组件的密封性能。
在一些实施例中，端盖组件还包括锁紧部件，锁紧部件为环状结构，被配置为套设并锁紧于盖帽外，以使得钉体与固定部抵压配合。通过设置锁紧部件，可以由钉体外向钉体及固定部施加作用力，保证钉体和固定部相互配合的紧密性。
在一些实施例中，固定部凸出于端盖的表面设置。钉体和固定部配合，固定部凸出于端盖板的表面使得至少部分钉体凸出于端盖板的表面设置，便于对钉体进行拆卸或安装动作。
在一些实施例中，端盖板的表面凹陷形成沉台，固定部连接于沉台的底面。可以保证端盖板外表面的平整性，减小端盖组件占据的空间。
另一方面，本申请实施例还提供一种电池单体，包括：壳体，具有开口，上述的端盖组件，用于密封开口。
又一方面，本申请实施例还提供一种电池组，包括：上述的电池单体，箱体，用于收容电池单体。
再一方面，本申请实施例还提供一种装置，包括上述的电池单体，电池单体用于提供电能。
还一方面，本申请实施例还提供一种电池单体的注液方法，方法包括：
通过电池单体的端盖组件中端盖板上的通孔注入电解液；
将钉体密封于注液孔内，使得固定部容纳于钉体的上呈环状的容纳部内，且固定部的内侧壁及外侧壁与容纳部的内壁抵压配合。
在本申请实施例的端盖组件中，端盖组件包括端盖板和钉体，端盖板上设置有通孔，钉体用于密封通孔。通孔的外周设置有固定部，钉体与固定部及通孔内壁配合，可以提高钉体与端盖板的接触面积，进而提高密封效果。此外，钉体包括环状的容纳部，环状的容纳部的两个内壁可以与固定部的内壁及外壁抵压配合。即环状容纳部可以向固定部提供两个方向上的限位，使得固定部受力平衡，这样不仅可以防止固定部倾斜变形，还可以增加钉体和固定部的接触面积，提高密封效果。
附图说明
申请为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1是本申请实施例提供的一种车辆的结构示意图；
图2是本申请实施例提供的一种电池组的结构示意图；
图3是本申请实施例提供的一种电池模块的结构示意图；
图4是本申请实施例提供的一种电池单体的结构示意图；
图5是本申请实施例提供的一种端盖组件的轴测图；
图6是本申请实施例提供的一种端盖组件的俯视图；
图7是图6中A-A处的剖视图；
图8是本申请实施例中图7中I处的局部放大结构示意图；
图9是本申请另一实施例中图7中I处的局部放大结构示意图；
图10是本申请再一实施例中图7中I处的局部放大结构示意图；
图11是本申请实施例提供的一种端盖组件的第一密封件的结构示意图；
图12是本申请实施例提供的一种端盖组件的第二密封件的结构示意图；
图13是本申请另一实施例提供的一种端盖组件的俯视图；
图14是图13中B-B处的剖视图；
图15是图14中II处的局部放大结构示意图；
图16是本申请实施例提供的一种端盖组件的钉体的结构示意图；
图17是图16中C-C处的剖视图；
图18是本申请实施例提供的一种端盖组件的锁紧部的结构示意图；
图19是图18中D-D处的剖视图；
图20是本申请实施例提供的一种电池单体的注液方法的流程图。
附图标记说明：
1、电池组；11、电池模块；12、箱体；2、车辆主体；
10、电池单体；20、容纳部；
100、端盖组件；
110、端盖板；111、通孔；112、固定部；113、沉台；113a、底面；
120、钉体；121、柱体；122、盖帽；123、凸部；
130、密封件；130a、第一密封件；130b、第二密封件；131、环状壁部；
140、锁紧部件；141、壁部；142、豁口；143、连接部；
200、壳体；
300、电极组件。
具体实施方式
下面将详细描述本申请的各个方面的特征和示例性实施例。在下面的详细描述中，提出了许多具体细节，以便提供对本申请的全面理解。但是，对于本领域技术人员来说很明显的是，本申请可以在不需要这些具体细节中的一些细节的情况下实施。下面对实施例的描述仅仅是为了通过示出本申请的示例来提供对本申请的更好的理解。在附图和下面的描述中，至少部分的公知结构和技术没有被示出，以便避免对本申请造成不必要的模糊；并且，为了清晰，可能夸大了部分结构的尺寸。此外，下文中所描述的特征、结构或特性可以以任何合适的方式结合在一个或更多实施例中。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，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申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的实施例的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“连接”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；可以是直接相连，也可以间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
目前一些锂离子电池为了实现二次注液，密封件通常采用插拔的方式密封于注液口内。锂离子在使用过程中可能会产生气体而使得锂离子电池的壳体发生变形，而注液口部位和壳体其他部位平齐，壳体上对应于注液口的部位变形量较大，密封件可能会随着壳体的变形而移位，并最终导致注液口密封失效。
为了解决上述问题，提出本申请。
为了更好地理解本申请，下面结合图1至图20对本申请实施例的电连接组件及电池模组进行详细描述。
请参阅图1，图1是本申请实施例提供的一种车辆的结构示意图。如图1所示，车辆包括电池组1和车辆主体2，电池组1设置于车辆主体2。
车辆为新能源汽车，其可以为纯电动汽车，也可以混合动力汽车或增程式汽车。车辆主体2设置有驱动电机，驱动电机与电池组1电连接，由电池组1提供电能，驱动电机通过传动机构与车辆主体2上的车轮连接，从而驱动汽车行进。在一些实施例中，电池组1可水平设置于车辆主体2的底部。
请参阅图2，图2是本申请实施例提供的一种电池组1的结构示意图。在一些实施例中，电池组1包括箱体12和设置于箱体12内的电池模块11。
电池模块11的数量可以为一个或多个，当电池模块11为多个时，多个电池模块11排列布置于箱体12内。箱体12的类型有多种，箱体12可为框状箱体、盘状箱体或盒状箱体等，具体地，箱体12可包括用于容纳电池模块的下箱体和与下箱体盖合的上箱体。
请参阅图3，图3是本申请实施例提供的一种电池模块11的结构示意图。电池模块11的设置方式有多种，在一些实施例中，电池模块11包括容纳部20和位于容纳部20的多个电池单体10，多个电池单体10在容纳部20内并排设置。
容纳部20的设置方式有多种，例如容纳部20包括外壳和盖设于外壳处的盖板；或者，容纳部20包括相继围合连接的侧板和端板；或者，容纳部包括相对设置的端板及环绕于端板和电池单体外的箍带；或者，如图3所示，容纳部20包括侧板、端板和箍带。
电池单体10不仅可以应用于车辆，还可以用于其他装置。本申请实施例还提供一种使用电池单体10作为电源的装置，装置可以但不仅限于为车辆、船舶或飞行器等。
请参阅图4，图4是本申请实施例提供的一种电池单体10的结构示意图。
如图4所示，在一些实施例中，电池单体10包括具有开口的壳体200和盖设于壳体200处的端盖组件100。电池单体10的壳体200内还设置有电极组件300。
在一些实施例中，壳体200内设置有电解液，端盖组件100上设置有用作注液口的通孔111和密封通孔111的钉体120。通过通孔111可以向壳体200内注入电解液，通过钉体120可以密封通孔111。
请一并参阅图5至图7，图5是本申请实施例提供的一种端盖组件100的轴测图。图6是本申请实施例提供的一种端盖组件100的俯视图。图7是图6中A-A处的剖视图。
根据本申请实施例的端盖组件100，端盖组件100包括：端盖板110，包括用于注入电解液的通孔111及环绕通孔111设置的固定部112；钉体120，包括用于收容固定部112的容纳部，容纳部呈环状并包括在其径向上分隔设置的两个内壁，固定部112的内壁及外壁分别与钉体120的两个内壁抵压配合，以密封通孔111。
上述端盖组件100不仅可以用于电池单体10中以盖设于电池单体10的壳体200的开口处，还可以盖设于其他装置的开口处。
固定部112的内壁是指固定部112朝向通孔111的内壁面，固定部112的外壁是指固定部112背离通孔111的外壁面。容纳部包括用于容纳固定部112的容纳空间，容纳部的内壁是指容纳部朝向容纳空间的内壁面。
在本申请实施例的端盖组件100中，端盖组件100包括端盖板110和钉体120，端盖板110上设置有通孔111，钉体120用于密封通孔111。通孔111的外周设置有固定部112，钉体120与固定部112及通孔111内壁配合，可以提高钉体120与端盖板110的接触面积，进而提高密封效果。同时，固定部112环绕通孔111设置，相对端盖板110其他部分突出，端盖板110变形传导到固定部112的变形少，可以减小电池单体10端盖板110变形对密封界面的影响，进一步提高密封效果。此外，钉体 120包括环状的容纳部，环状的容纳部的两个内壁可以与固定部112的内壁及外壁抵压配合。即环状容纳部可以向固定部112提供两个方向上的限位，使得固定部112受力平衡。这样不仅可以防止固定部112倾斜变形，还可以增加钉体120和固定部112的接触面积，避免钉体120随着顶盖板110的变形而移位，提高密封效果。
在本申请实施例的端盖组件100中，电池单体10在使用过程中可能产生气体，使得端盖组件100会产生凸起变形。由于固定部112环绕通孔111设置，可以增加钉体120和端盖板110在其厚度方向上的配合距离。当端盖组件100凸起变形时，可以增加变形的传递距离，使得变形难以传递至固定部112，保证钉体120和固定部112配合的紧密性。
在本申请实施例中，由于钉体120和端盖组件100上通孔111的配合较为紧密，因此钉体120可以采用过盈配合的方式与通孔111及固定部112相互配合，使得钉体120可拆卸地设置于端盖板110。在电池单体10的使用过程中，当电池单体10充放电次数增加而导致电解液减少时，可以将钉体120拆下，便于对电池单体10进行二次注液。
请一并参阅图8和图9，图8是图7中I处的局部放大结构示意图，图9是本申请另一实施例中图7中I处的局部放大结构示意图。
固定部112的设置方式有多种，如图8所示，固定部112可以直接凸出于端盖板110的表面设置。在这些实施例中，固定部112凸出于端盖板110的表面，钉体120和固定部112配合，使得至少部分钉体120凸出于端盖板110的表面设置，便于对钉体120进行拆卸或安装动作。
在另一些实施例中，如图9所示，端盖板110的表面凹陷形成沉台113，固定部112连接于沉台113的底面113a。在这些实施例中，固定部112位于沉台113内，可以保证端盖板110外表面的平整性，减小端盖组件100占据的空间。
在一些实施例中，当钉体120密封于通孔111内时，钉体120位于沉台113内，能够减小端盖组件100占据的空间。
钉体120的材料的设置方式有多种，在一些实施例中钉体120的材料包括钢、铝或其他硬性金属材料中的一种，或者钉体120的材料包括工 程塑料等。
钉体120的设置方式有多种，在一些实施例中，钉体120包括柱体121和连接于柱体121一端的盖帽122，柱体121用于密封通孔111，盖帽122包括环绕柱体121设置的凸部123，使得凸部123和柱体121之间形成环状的容纳部。柱体121和固定部112的内壁抵压配合，凸部123与固定部112的外壁抵压配合。
在这些实施例中，柱体121和凸部123分别形成容纳部的两个内壁，柱体121和凸部123向固定部112提供两个方向上的限位，使得固定部112受力更加平衡，可以提高端盖组件100的密封性能。
在一些实施例中，为了进一步提高端盖组件100的密封性能，端盖组件100还包括密封件130，密封件130设置于钉体120和固定部112之间，以实现钉体120与固定部112的抵压配合。
在这些实施例中，通过设置密封件130使得钉体120和固定部112可以过盈配合，提高端盖组件100的密封性能。
密封件130的设置位置有多种，在一些实施例中，密封件130包括第一密封件130a，第一密封件130a套设于柱体121和固定部112的内壁之间，使得柱体121和固定部112紧密配合。通过设置第一密封件130a使得柱体121和固定部112可以过盈配合，提高端盖组件100的密封性能。
在一些实施例中，柱体121和/或固定部112上设置有第一容置槽(图中未示出)，以使第一密封件130a可以位于第一容置槽内。在这些实施例中，第一密封件130a可以位于第一容置槽内，通过第一容置槽可以向第一密封件130a提供限位，防止第一密封件130a发生错位，保证第一密封件130a与固定部112和/或钉体120相对位置的稳定性。
在另一些实施例中，密封件130还包括第二密封件130b，第二密封件130b套设于固定部112的外壁和凸部123之间，使得凸部123和固定部112紧密配合。通过设置二密封件130使得凸部123和固定部112可以过盈配合，提高端盖组件100的密封性能。
在一些实施例中，凸部123和/或固定部112上设置有第二容置槽 (图中未示出)，以使第二密封件130b可以位于第二容置槽内。在这些实施例中，第二密封件130b可以位于第二容置槽内，通过第二容置槽可以向第二密封件130b提供限位，防止第二密封件130b发生错位，保证第二密封件130b与固定部112和/或钉体120相对位置的稳定性。
在又一些实施例中，密封件130包括第一密封件130a和第二密封件130b，使得柱体121和固定部112可以紧密配合，凸部123和固定部112也可以紧密配合，保证固定部112受力平衡，并提高端盖组件100的密封性能。
密封件130的形状不做限定，在一些实施例中，请继续参阅图9，密封件130包括环状壁部131，环状壁部131的截面呈圆形。环状壁部131的截面为与密封件130径向垂直的面。在这些实施例中，截面呈圆形的环状壁部131使得钉体120压入通孔111内时受到的阻力较小，装配方便。
在另一些实施例中，请一并参阅图10至图12，环状壁部131的截面呈矩形，以使密封件130与固定部112和/或钉体120面面接触连接。密封件130与固定部112和/或钉体120面面接触，可以增加密封件130和固定部112和/或钉体120的接触面积，提高端盖组件100的密封性能。
当密封件130包括第一密封件130a和第二密封件130b时，第一密封件130a的截面可以和第二密封件130b的截面形状可以相同，即第一密封件130a和第二密封件130b的截面均呈圆形或矩形。或者，第一密封件130a和第二密封件130b的截面形状不同，即第一密封件130a和第二密封件130b中一者的截面呈圆形，另一者呈矩形。
密封件130的材料的设置方式有多种，在一些实施例中，密封件130的材料可以包括橡胶、泡棉中的至少一者。只要密封件130具有一定的弹性，使得钉体120和固定部112可以通过密封件130过盈配合即可。
请一并参阅图13至图19，在一些实施例中，端盖组件100还包括锁紧部件140，锁紧部件140为环状结构，锁紧部件140被配置为锁紧于端盖板110外，以使钉体120与固定部112抵压配合。
在这些实施例中，通过设置锁紧部件140，可以由钉体120外向钉体120及固定部112施加作用力，保证钉体120和固定部112相互配合的紧密性。
锁紧部件140的设置方式有多种，在一些实施例中，锁紧部件140具有壁部141及壁部141围合形成的中空空间，中空空间的尺寸可调，使得锁紧部件140可以锁紧钉体120与固定部112。
例如，壁部141具有弹性，通过壁部141的弹性变形锁紧钉体120与固定部112。
或者壁部141上开设有和中空空间连通的豁口142，使得锁紧部140件不是闭合环状，通过调节豁口142的大小来锁紧钉体120与固定部112。
在一些实施例中，壁部141在豁口142的两端具有连接部143，连接部143具有贯穿的贯穿孔，豁口142两端的两个贯穿孔可以通过中间连接件相互连接。
在一些实施例中，端盖组件100还包括可溶胶，设置于端盖板110并用于连接钉体120和端盖板110。可溶胶覆盖在钉体120上，可以进一步保证钉体120和端盖板110之间相对位置的稳定性。可溶胶例如采用可融材料制成。在需要进行二次注液时，对可溶胶进行溶解操作，使得可溶胶变形融化，进而便于从通孔111内拔出钉体120。
请参阅图20，图20是本申请第二实施例提供的一种电池单体10的注液方法，电池单体10可以为上述任一实施例中的电池单体10，注液方法包括：
步骤S1：通过电池单体的端盖组件中端盖板上的通孔注入电解液。
步骤S2：将钉体密封于通孔内，使得固定部容纳于钉体的上呈环状的容纳部内，且固定部的内侧壁及外侧壁与容纳部的内壁抵压配合。
在这些实施例中，首先通过通孔111向电池单体10内注入电解液，然后将钉体120密封于通孔111内，且使得固定部112的内侧壁及外侧壁与容纳部的内壁抵压配合，环状容纳部可以向固定部112提供两个方 向上的限位，使得固定部112受力平衡，不仅可以防止固定部112倾斜变形，还可以增加钉体120和固定部112的接触面积，提高密封效果。
在另一些实施例中，当电池单体10使用时间较长，电解液容量降低时，注液方法还包括：将钉体120由通孔111内拔出，通过通孔111注入电解液，并重新将钉体120密封于通孔111内。进而实现电池单体10的二次注液。
本申请可以以其他的具体形式实现，而不脱离其精神和本质特征。例如，特定实施例中所描述的算法可以被修改，而***体系结构并不脱离本申请的基本精神。因此，当前的实施例在所有方面都被看作是示例性的而非限定性的，本申请的范围由所附权利要求而非上述描述定义，并且，落入权利要求的含义和等同物的范围内的全部改变从而都被包括在本申请的范围之中。

Claims (15)

  1. 一种用于电池单体的端盖组件，包括：
    端盖板，包括用于注入电解液的通孔及环绕所述通孔设置的固定部；
    钉体，包括用于***述固定部的容纳部，所述容纳部呈环状并包括在其径向上分隔设置的两个内壁，所述固定部的内壁及外壁分别与所述容纳部的所述两个内壁抵压配合，以密封所述通孔。
  2. 根据权利要求1所述的端盖组件，其中，所述钉体包括用于密封所述通孔的柱体及连接于所述柱体一端的盖帽，所述盖帽包括环绕所述柱体设置的凸部，所述凸部和所述柱体围合形成所述容纳部，且所述柱体与所述固定部的内壁抵压配合，所述凸部与所述固定部的外壁抵压配合。
  3. 根据权利要求2所述的端盖组件，其中，所述端盖组件还包括密封件，所述密封件设置于所述钉体和所述固定部之间，以实现所述钉体与所述固定部的抵压配合。
  4. 根据权利要求3所述的端盖组件，其中，所述密封件包括第一密封件，套设于所述柱体和所述固定部内壁之间，所述柱体和/或所述固定部内壁上设置有第一容置槽，以使所述第一密封件位于所述第一容置槽。
  5. 根据权利要求3或4所述的端盖组件，其中，所述密封件包括第二密封件，套设于所述固定部外壁和所述凸部之间，所述固定部外壁和/或所述凸部上设置有第二容置槽，以使所述第二密封件位于所述第二容置槽。
  6. 根据权利要求3-5任一项所述的端盖组件，其中，所述密封件(130)包括环状壁部；
    所述环状壁部的截面呈圆形；
    或者，所述环状壁部的截面呈矩形，以使所述密封件与所述固定部和/或所述钉体面面接触设置。
  7. 根据权利要求2-6任一项所述的端盖组件，其中，所述端盖组件还包括锁紧部件，所述锁紧部件为环状结构，被配置为套设并锁紧于所述盖帽外，以使得所述钉体与所述固定部抵压配合。
  8. 根据权利要求7所述的端盖组件，其中，所述锁紧部件具有壁部及由所述壁部围合形成的中空空间，所述中空空间的尺寸可调。
  9. 根据权利要求8所述的端盖组件，其中，
    所述壁部具有弹性；
    或者，所述壁部上开设有和所述中空空间连通的豁口，以通过调节所述豁口的大小来锁紧所述钉体与所述固定部。
  10. 根据权利要求9所述的端盖组件，其中，所述壁部上开设有和所述中空空间连通的豁口，所述壁部在豁口的两端具有连接部，所述连接部具有贯穿的贯穿孔，所述豁口两端的两个所述贯穿孔可以通过中间连接件相互连接。
  11. 根据权利要求1-10任一项所述的端盖组件，其中，
    所述固定部凸出于所述端盖板的表面设置；
    或者，所述端盖板的表面凹陷形成沉台，所述固定部连接于所述沉台的底面。
  12. 一种电池单体，包括：
    壳体，具有开口；
    权利要求1-11任一项所述的端盖组件，用于封闭所述开口。
  13. 一种电池组，包括：
    权利要求2所述的电池单体；
    箱体，用于***述电池单体。
  14. 一种装置，包括权利要求12所述的电池单体，所述电池单体用于提供电能。
  15. 一种电池单体的注液方法，所述方法包括：
    通过电池单体的端盖组件中端盖板上的通孔注入电解液；
    将钉体密封于注液孔内，使得固定部容纳于所述钉体的上呈环状的容纳部内，且所述固定部的内侧壁及外侧壁与所述容纳部的内壁抵压配合。
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