WO2024243909A1 - 端盖组件、储能装置以及用电设备 - Google Patents

端盖组件、储能装置以及用电设备 Download PDF

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Publication number
WO2024243909A1
WO2024243909A1 PCT/CN2023/097622 CN2023097622W WO2024243909A1 WO 2024243909 A1 WO2024243909 A1 WO 2024243909A1 CN 2023097622 W CN2023097622 W CN 2023097622W WO 2024243909 A1 WO2024243909 A1 WO 2024243909A1
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WO
WIPO (PCT)
Prior art keywords
cover plate
sheet
adapter
pole
away
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2023/097622
Other languages
English (en)
French (fr)
Inventor
熊永锋
陈志雄
黄立炫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Hithium Energy Storage Technology Co Ltd
Shenzhen Hithium Energy Storage Technology Co Ltd
Original Assignee
Xiamen Hithium Energy Storage Technology Co Ltd
Shenzhen Hithium Energy Storage Technology Co Ltd
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 Xiamen Hithium Energy Storage Technology Co Ltd, Shenzhen Hithium Energy Storage Technology Co Ltd filed Critical Xiamen Hithium Energy Storage Technology Co Ltd
Priority to PCT/CN2023/097622 priority Critical patent/WO2024243909A1/zh
Publication of WO2024243909A1 publication Critical patent/WO2024243909A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—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
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing

Definitions

  • the present invention relates to the field of energy storage technology, and in particular to an end cover assembly, an energy storage device and an electrical equipment.
  • Secondary batteries (such as square lithium-ion batteries) generally include a housing, an end cap assembly, and an electrode assembly.
  • the housing and the end cap assembly cooperate to form a receiving cavity, and the electrode assembly is arranged in the receiving cavity.
  • the end cap assembly includes a positive electrode column and a negative electrode column.
  • the electrode assembly has a positive electrode ear and a negative electrode ear.
  • the positive electrode ear is electrically connected to the positive electrode column
  • the negative electrode ear is electrically connected to the negative electrode column, so as to realize the extraction of current.
  • the pole and the lug need to be electrically connected through an adapter.
  • the adapter and the pole are generally laser welded. Specifically, one side of the adapter corresponding to the pole is in contact with the pole, and the other side is opposite to the laser welding head, so that the adapter and the pole are welded under the action of the laser.
  • there is a risk of unreliable welding between the existing adapter and the pole after laser welding which makes the conductivity of the battery poor and affects the assembly yield of the battery.
  • the present invention aims to solve at least one of the problems existing in the prior art.
  • the present invention provides an end cap assembly, an energy storage device and an electrical device, wherein the end cap assembly can ensure reliable welding between the adapter and the negative pole.
  • the present invention provides an end cap assembly, comprising a cover plate, an insulating support provided on one side of the cover plate in a thickness direction, and a pole installed in the cover plate and the insulating support along the thickness direction, wherein a first end of the pole is located on a side of the cover plate away from the insulating support, and a second end of the pole is located on a side of the insulating support away from the cover plate, and the end cap assembly further comprises a transfer sheet, wherein the transfer sheet comprises:
  • the adapter body is arranged on a side of the insulating bracket away from the cover plate;
  • a first connection portion is connected to one side of the adapter body in the length direction of the cover plate, and the first connection portion is connected to the second end of the pole; along the thickness direction, the first connection portion has a first surface and a second surface opposite to each other, the first surface is away from the pole, the second surface is close to the pole, and the first surface is provided with recessed portions arranged in an array;
  • the width of the first connecting portion is a
  • the width of the second end of the pole is b
  • the distance between the edge of the recessed portion and the edge corresponding to the first connecting portion is c, wherein a>b, 85% ⁇ b/a, 15% ⁇ c/a ⁇ 20%.
  • the adapter plate further includes two second connection parts, and the two second connection parts are respectively connected to the adapter plate body on opposite sides of the width direction of the cover plate, and one of the second connection parts is provided with an anti-missing corner at one end close to the first connection part, and the anti-missing corner is located at a side corner of the end of the second connection part close to the first connection part.
  • the cover plate is provided with a mounting hole
  • the mounting hole penetrates the cover plate along the thickness direction
  • the insulating bracket is provided with a hollow structure at a position corresponding to the mounting hole, at least one hollow hole portion on the hollow structure penetrates the insulating bracket along the thickness direction
  • the end cover assembly further includes a stress member disposed in the mounting hole
  • the adapter plate body is provided with a through hole.
  • the through hole is correspondingly connected to one of the hollow hole portions, and at least part of the stress member is visually displayed in the connected hollow hole portion and the through hole.
  • the diameter of the through hole is 3.5 mm-4.5 mm.
  • the size of the side of the orthographic projection of the hollow hole portion on the cover plate away from the pole is less than or equal to the diameter of the through hole.
  • the first end of the first connecting portion is connected to a side of the adapter plate body away from the middle of the cover plate
  • the insulating bracket includes a first sub-insulating bracket for setting the adapter plate, and the first end of the first sub-insulating bracket on the side away from the cover plate forms a first boss, and the first boss is provided with a clearance groove on the side wall close to the first connecting portion, and the second end of the first connecting portion away from the adapter plate body is accommodated in the clearance groove.
  • a mounting groove is provided on a side of the insulating bracket facing away from the cover plate, and the second end of the pole is adapted to and mounted in the mounting groove;
  • the distance between the groove wall of the installation groove and the groove wall corresponding to the clearance groove is H1, wherein 15% ⁇ H1/b ⁇ 20%.
  • a mounting groove is provided on a side of the insulating bracket facing away from the cover plate, and the second end of the pole is adapted to and mounted in the mounting groove;
  • the distance between the groove wall of the give way groove and the groove wall corresponding to the mounting groove is d1
  • the length of the second end of the pole is d2
  • the length of the recessed portion is d3
  • the distance between the edge of the first connecting portion and the edge corresponding to the recessed portion is d4, wherein 15% ⁇ d1/d2 ⁇ 20%, 80% ⁇ d3/d2 ⁇ 85%, and 15% ⁇ d4/d2 ⁇ 20%.
  • the first end of the first connecting portion is connected to a side of the adapter plate body away from the middle of the cover plate
  • the insulating bracket includes a first sub-insulating bracket for setting the adapter plate
  • the second end of the first sub-insulating bracket on the side away from the cover plate forms a second boss
  • a plurality of ribs are provided on a side of the second boss close to the first connecting portion, and the plurality of ribs are arranged at intervals along the width direction of the cover plate
  • a clearance notch is provided on a side of the adapter plate body away from the first connecting portion, and the plurality of ribs are at least partially accommodated in the clearance notch.
  • the present invention provides an energy storage device, comprising at least one battery cell, wherein the battery cell comprises a housing, an electrode assembly, and an end cap assembly as described in any of the above embodiments;
  • the shell has an opening and a receiving cavity
  • the electrode assembly includes a pole ear
  • the adapter sheet includes a second connecting portion corresponding to the pole ear
  • the electrode assembly is accommodated in the receiving cavity
  • the end cover assembly is encapsulated at the opening.
  • the battery cell further includes a plurality of protection sheets, one protection sheet is correspondingly disposed on each second connection portion of the adapter sheet, and the tab is connected between the protection sheet and the second connection portion.
  • the protection sheet is made of a metal sheet, and the protection sheet has a double-layer structure.
  • the metal sheet includes a first protective sub-sheet and two second protective sub-sheets connected to the first protective sub-sheet on opposite sides in the width direction, the two second protective sub-sheets are folded at an angle relative to the first protective sub-sheet and are arranged on the same side of the first protective sub-sheet in the thickness direction, and a gap is left between the two second protective sub-sheets along the width direction of the cover plate.
  • the first protection sub-sheet is attached to a side of the tab away from the second connection portion, and the two second protection sub-sheets are stacked on a side of the first protection sub-sheet away from the tab;
  • Each of the second protection sub-sheets has an indentation at at least one end in the length direction close to the corner of another second protection sub-sheet, and the two indentations at the same end of the two second protection sub-sheets in the length direction form a receiving space.
  • a stopper is protrudingly provided at at least one end of the first protective sub-sheet in the length direction, and the stopper is partially received in the receiving space formed by the two inwardly contracted notches.
  • the present invention provides an electrical device, comprising an energy storage device as described in any of the above embodiments.
  • the present invention has the following beneficial effects: in the end cap assembly, by limiting the ratio between the width a of the first connection portion and the width b of the second end of the negative electrode column, and limiting the ratio between the distance c between the edge of the recessed portion and the edge corresponding to the first connection portion and the width a of the first connection portion, the minimum width dimension of the smooth area on both sides of the recessed portion is limited to be greater than or equal to the maximum tolerance space of the second end of the negative electrode column relative to the first connection portion, which means that even if the second end of the negative electrode column is aligned with the first connection portion at 15% of the maximum tolerance space, as long as the second end of the negative electrode column does not exceed the area of the first connection portion In this case, by identifying the area where the recessed portion on the first connection portion is located for welding, reliable welding between the first connection portion and the second end of the negative electrode column can be ensured.
  • the recessed portion provided on the first surface of the first connection portion can not only increase the roughness of the first surface, reduce the reflection effect of the first surface on the laser, and avoid the problem of molten beads splashing or even deflagration due to reflection during laser welding, but also increase the number of oblique reflections of the laser on the first surface, improve the absorption rate of the laser by the first surface, and help avoid the problem of cold welding or poor welding.
  • FIG1 is a diagram showing an application scenario of an energy storage device provided by an embodiment of the present invention in user-side energy storage.
  • FIG. 2 is a schematic diagram of the three-dimensional structure of an energy storage device provided in one embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a partial three-dimensional exploded structure of the energy storage device shown in FIG. 2 .
  • FIG. 4 is a schematic diagram of the three-dimensional structure of the battery cell shown in FIG. 3 .
  • FIG. 5 is a schematic diagram of a partial three-dimensional exploded structure of the battery cell shown in FIG. 4 .
  • FIG. 6 is a partial cross-sectional view of the battery cell shown in FIG. 4 along the A-A direction.
  • FIG. 7 is a bottom view of the end cap assembly shown in FIG. 5 .
  • FIG. 8 is a schematic diagram of the three-dimensional structure of the negative electrode adapter shown in FIG. 7 .
  • FIG. 9 is a schematic diagram of the three-dimensional structure of the negative electrode column, the negative electrode adapter and the negative electrode ear shown in FIG. 6 .
  • FIG10 is a schematic diagram of the three-dimensional structure of the negative electrode column, the negative electrode adapter and the negative electrode ear shown in FIG9 from another perspective.
  • FIG. 11 is a schematic diagram of the three-dimensional structure of the protection sheet shown in FIG. 10 .
  • Fig. 12 is a cross-sectional view of the protection sheet shown in Fig. 11 along the B-B direction.
  • FIG. 13 is a schematic diagram of the three-dimensional exploded structure of the end cover assembly shown in FIG. 5 .
  • FIG. 14 is a schematic diagram of the three-dimensional exploded structure of the end cover assembly shown in FIG. 13 from another viewing angle.
  • FIG. 15 is a schematic diagram of the first sub-insulating support shown in FIG. 14 .
  • the main way to generate green electricity is to develop green energy such as photovoltaics and wind power to replace fossil energy.
  • the generation of green electricity generally relies on photovoltaics, wind power, water potential, etc., while wind and solar energy generally have strong intermittent and volatile problems, which will cause instability in the power grid, insufficient electricity during peak hours, too much electricity during low hours, and unstable voltage will also cause damage to electricity.
  • insufficient electricity demand or insufficient grid acceptance capacity may cause the problem of "abandoning wind and light".
  • energy storage must be relied on. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and then the energy is converted into electrical energy and released when needed. Simply put, energy storage is like a large "power bank”. When photovoltaic and wind energy are sufficient, electrical energy is stored, and the stored electricity is released when needed.
  • an embodiment of the present invention provides an energy storage device, in which a chemical battery is arranged.
  • the energy storage device mainly uses the chemical elements in the chemical battery as the energy storage medium.
  • the charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium.
  • the electric energy generated by wind energy and solar energy is stored in the chemical battery.
  • the use of external electric energy reaches a peak, the stored electricity is released for use, or transferred to a place where electricity is scarce for use.
  • energy storage i.e. energy storage
  • power generation side energy storage grid side energy storage
  • renewable energy grid-connected energy storage user side energy storage.
  • energy storage devices include:
  • the embodiment of the present invention takes the household energy storage scenario in the user-side energy storage as an example to illustrate the energy storage device 1 provided by the embodiment of the present invention.
  • the energy storage device 1 provided by the embodiment of the present invention is not limited to the household energy storage scenario.
  • an embodiment of the present invention provides a household energy storage system, which includes an electric energy conversion device 2 (photovoltaic panel), a first user load 3 (street lamp), a second user load 4 (such as air conditioner and other household appliances), and an energy storage device 1, wherein the energy storage device 1 is a small energy storage box that can be mounted on an outdoor wall by wall hanging.
  • the photovoltaic panel can convert solar energy into electric energy during the period of low electricity price, and the energy storage device 1 is used to store the electric energy and supply it to street lamps and household appliances for use during the peak electricity price, or to supply power when the power grid is off/power outage.
  • the energy storage device 1 may include but is not limited to a battery cell, a battery module, a battery pack, a battery system, etc.
  • the energy storage device 1 may be a square battery.
  • the energy storage device 1 provided in the embodiment of the present invention will be described in detail below with reference to FIG. 2 to FIG. 14 .
  • the energy storage device 1 provided in the embodiment of the present invention includes a box assembly 10 and at least one battery cell 20 accommodated and installed in the box assembly 10.
  • the energy storage device 1 includes a plurality of the battery cells 20, and the plurality of the battery cells 20 are electrically connected in series, or electrically connected in parallel, or partially electrically connected in series and the other partially electrically connected in parallel through a bus assembly 30, which is not limited to this.
  • the energy storage device 1 includes a plurality of the battery cells 20, and is electrically connected in series through the bus assembly 30, so that the overall capacity of the energy storage device 1 is large and can meet the different power requirements of users.
  • the bus assembly 30 may include but is not limited to a bus bar, a connecting wire, etc.
  • the bus assembly 30 includes a plurality of the battery cells 20, and the battery cells 20 are ... and the connecting wires are connected in parallel.
  • the flow assembly 30 includes a plurality of bus bars to realize the series connection of the plurality of battery cells 20, wherein two bus bars at the head and tail ends in the series connection direction are exposed from the box assembly 10 to serve as the positive and negative output ends of the energy storage device 1 to realize power transmission.
  • the box assembly 10 includes a box 11 with an upper opening and an upper cover 12 for covering the upper opening of the box 11 , and a plurality of battery cells 20 are accommodated in the box 11 side by side along the length direction of the box 11 .
  • a plurality of battery cells 20 are accommodated in the box 11 side by side along the length direction of the box 11 .
  • the box 11 may include a pair of end plates 111 , a pair of side plates 112 and a plurality of connection frames 113 , wherein the pair of end plates 111 and the pair of side plates 112 enclose a receiving space with two upper and lower openings, and the plurality of connection frames 113 are arranged in the receiving space at intervals along the length direction of the box 11 , and the opposite ends of each connection frame 113 along the width direction of the box 11 are fixedly connected to the pair of side plates 112 , and a plurality of pairs of support feet 1131 are arranged on the side adjacent to the lower opening of each of the two adjacent connection frames 113 , and the plurality of pairs of support feet 1131 are used to carry the battery cells 20 installed between the two adjacent connection frames 113 .
  • the box body 11 may also be a box body of other structures, such as a box body with an upper opening formed by a pair of end plates 111, a pair of side plates 112 and a bottom plate.
  • the specific structure is not limited.
  • the upper cover 12 can be detachably connected to the box body 11 by any means such as a snap connection or a threaded connection, so as to facilitate the disassembly and assembly of the box body assembly 10.
  • a heat insulating gasket 114 is also sandwiched between each two adjacent battery cells 20 to achieve thermal isolation between the two adjacent battery cells 20, which helps to improve the safety performance of the battery cell 20.
  • the battery cell 20 includes a housing 21, an electrode assembly 22 and an end cap assembly 23.
  • the housing 21 has an upper opening and a receiving cavity, the electrode assembly 22 is received in the receiving cavity, and the end cap assembly 23 is encapsulated at the opening.
  • the number of the electrode assemblies 22 may be one or more.
  • each of the battery cells 20 includes a plurality of the electrode assemblies 22 stacked along the width direction of the shell 21, and the electrical connection method between the plurality of electrode assemblies 22 is not limited.
  • the battery cell 20 includes two electrode assemblies 22, and each of the electrode assemblies 22 includes two electrode sub-assemblies connected in parallel.
  • the electrode sub-assemblies may adopt an existing wound electrode assembly or an existing laminated electrode assembly, which will not be elaborated on.
  • each of the electrode assemblies 22 has a negative electrode ear 221 and a positive electrode ear 222, and the negative electrode ear 221 and the positive electrode ear 222 are respectively located at opposite ends of the length direction of the electrode assembly 22.
  • each of the electrode ears includes a sheet-like body and a connector connected to the sheet-like body at one end, and the other end of the connector is connected to the electrode assembly 22, and the sheet-like body is parallel or substantially parallel to the cover plate 235 in the end cap assembly 23 (described later).
  • the sheet-like body and the connector of each of the electrode ears are preferably an integral structure and are made by stamping, folding and other processes.
  • the negative electrode ear 221 includes a first sheet-like body 2211 and a first connector 2212
  • the positive electrode ear 222 includes a second sheet-like body 2221 and a second connector 2222.
  • the first sheet-like body 2211 and the second sheet-like body 2221 are respectively used to connect the negative electrode column 231 and the positive electrode column 232 in the end cover assembly 23 (related description will be provided later), thereby realizing the power transmission of the electrode assembly 22.
  • the end cover assembly 23 includes a negative electrode column 231 and a positive electrode column 232, as well as a negative electrode adapter plate 233 and a positive electrode adapter plate 234.
  • the negative electrode column 231 is electrically connected to the first sheet-like body 2211 of the negative electrode ear 221 of each electrode assembly 22 through the negative electrode adapter plate 233
  • the positive electrode column 232 is electrically connected to the second sheet-like body 2221 of the positive electrode ear 222 of each electrode assembly 22 through the positive electrode adapter plate 234.
  • the two electrode assemblies 22 in the battery cell 20 are connected in parallel, and each electrode assembly 22 can realize power transmission through the pair of electrode columns with an external power source or a power supply.
  • the end cap assembly 23 further includes a cover plate 235 and an insulating bracket 236 disposed on one side of the cover plate 235 in the thickness direction.
  • the negative pole 231 and the positive pole 232 are installed in the cover plate 235 and the insulating bracket 236 along the thickness direction, and are respectively located at opposite ends of the length direction of the cover plate 235.
  • each pole i.e., the side away from the insulating bracket 236
  • the first end of each pole is located on the side of the cover plate 235 away from the insulating bracket 236, and the second end of each pole (i.e., the end away from the cover plate 235) is located on the side of the insulating bracket 236 away from the cover plate 235.
  • the second end of each pole is electrically connected to the corresponding adapter plate, and then electrically connected to the corresponding pole ear through the adapter plate.
  • the adapter sheet has different connection parts, and the poles and the corresponding pole ears are electrically connected to different connection parts of the adapter sheet.
  • the structure of the negative electrode adapter sheet 233 is basically the same as that of the positive electrode adapter sheet 234.
  • the structure of the adapter sheet in the embodiment of the present invention is described in detail below by taking the negative electrode adapter sheet 233 as an example.
  • the negative electrode adapter sheet 233 includes an adapter sheet body 2331, a first connection part 2332 and at least one second connection part 2333.
  • the adapter body 2331 is disposed on the side of the insulating bracket 236 away from the cover plate 235 (see FIG.
  • the first connection portion 2332 is connected to one side of the adapter body 2331 in the length direction of the cover plate 235, and the first connection portion 2332 covers the second end of the negative electrode column 231 (see FIG. 6 ), and the at least one second connection portion 2333 is connected to at least one side of the adapter body 2331 in the width direction of the cover plate 235 (see FIG. 7 ).
  • the first connection portion 2332 is electrically connected to the second end of the negative electrode column 231, and each of the second connection portions 2333 is electrically connected to the corresponding negative electrode ear 221 of the electrode assembly 22.
  • the negative electrode adapter 233 is generally in the shape of a Chinese character “ ⁇ ”, and includes two second connection portions 2333, and the two second connection portions 2333 are respectively connected to the adapter body 2331 at opposite sides of the width direction of the cover plate 235, so as to be respectively used to electrically connect the two negative electrode ears 221 of the two parallel electrode assemblies 22.
  • the negative electrode adapter 233 may include only one second connection portion 2333, so as to be used to electrically connect the negative electrode ear 221 of the electrode assembly 22.
  • the first connection portion 2332 has a first surface (i.e., a side away from the negative electrode column 231) and a second surface (i.e., a side close to and facing the negative electrode column 231) opposite to each other, and the first surface is used to receive laser irradiation or receive the impact of the ultrasonic welding head so that the second surface is welded to the second end of the negative electrode column 231, that is, the first connection portion 2332 and the negative electrode column 231 can be electrically connected by laser welding or ultrasonic welding.
  • a first surface i.e., a side away from the negative electrode column 231
  • a second surface i.e., a side close to and facing the negative electrode column 231 opposite to each other
  • the first surface is used to receive laser irradiation or receive the impact of the ultrasonic welding head so that the second surface is welded to the second end of the negative electrode column 231, that is, the first connection portion 2332 and the negative electrode column 231 can be electrically connected by laser welding or ultra
  • the first connection portion 2332 is preferably electrically connected to the second end of the negative electrode column 231 by laser welding, and the welding is firm and the structure is stable.
  • the width of the first connection portion 2332 is a (see FIG. 8)
  • the width of the second end of the negative electrode column 231 is b (see FIG. 9)
  • a and b satisfy the relationship: a>b, and 85% ⁇ b/a.
  • the width dimension of the first connecting portion 2332 By limiting the width dimension of the first connecting portion 2332 to be slightly larger than the width dimension of the second end of the negative electrode column 231, not only can the manufacturing materials of the negative electrode adapter 233 be saved and the cost be reduced, but also an assembly gap can be reserved for the negative electrode adapter 233, reducing the assembly operation accuracy of the operator, thereby speeding up the production cycle and improving production efficiency.
  • the width a of the first connecting portion 2332 is slightly larger than the width b of the second end of the negative electrode column 231. Therefore, during welding, it is impossible to accurately locate the area where the first connecting portion 2332 and the second end of the negative electrode column 231 can be reliably welded, which will affect the reliable welding between the first connecting portion 2332 and the second end of the negative electrode column 231.
  • the first surface of the first connection portion 2332 is provided with an array of recessed portions 2334, wherein along the width direction of the cover plate 235, the distance between the edge of the recessed portion 2334 and the edge corresponding to the first connection portion 2332 is c, and the relationship between c and a (i.e., the width of the first connection portion 2332) satisfies the relationship: 15% ⁇ c/a ⁇ 20%.
  • the width a of the first connection portion 2332 and the width b of the second end of the negative electrode column 231 satisfy 85% ⁇ b/a ⁇ 100%, which means that the alignment tolerance interval between the first connection portion 2332 and the second end of the negative electrode column 231 is less than or equal to 15%.
  • the distance c between the edge of the recessed portion 2334 and the edge corresponding to the first connection portion 2332 and the width a of the first connection portion 2332 to satisfy 15% ⁇ c/a ⁇ 20%, it is also limited.
  • the smooth area of the first surface of the first connecting portion 2332 where the recessed portion 2334 is not provided is 15% to 20% of the first surface, that is, the minimum width dimension of the smooth area on both sides of the recessed portion 2334 is greater than or equal to the maximum tolerance space of the second end of the negative electrode column 231 relative to the first connecting portion 2332.
  • the recessed portion 2334 provided on the first surface of the first connection portion 2332 can not only increase the roughness of the first surface, reduce the reflection effect of the first surface on the laser, and avoid the problem of molten beads splashing or even deflagration due to reflection during laser welding, but also increase the number of oblique reflections of the laser on the first surface, improve the absorption rate of the laser by the first surface, and help avoid the problem of cold welding or poor welding.
  • the welding line of laser welding generally has a certain width, and even if the welding position is located at the edge of the recessed portion 2334, the connection reliability between the first connection portion 2332 and the second end of the negative pole 231 can be guaranteed.
  • the recessed portion 2334 may be, but is not limited to, a dot matrix indentation formed by stamping or a dot matrix pit formed by etching, and no limitation is made thereto.
  • each of the second connecting portions 2333 has a third surface (i.e., a surface close to and facing the negative electrode ear 221) and a fourth surface (i.e., a surface away from the negative electrode ear 221) opposite to each other, the third surface is coplanar with the first surface, the fourth surface is coplanar with the second surface, and the third surface of each of the second connecting portions 2333 is electrically connected to the corresponding negative electrode ear 221 (specifically, electrically connected to the first sheet-like body 2211).
  • the second connecting portion 2333 can be electrically connected to the corresponding negative electrode ear 221 by laser welding or ultrasonic welding. In the examples of FIGS. 8 to 10, the second connecting portion 2333 is preferably electrically connected to the corresponding negative electrode ear 221 by ultrasonic welding, and the welding is firm and safe.
  • At least one end of at least one second connection portion 2333 close to the first connection portion 2332 is provided with at least one foolproof missing corner 2335.
  • the foolproof missing corner 2335 By providing the foolproof missing corner 2335, it can cooperate with the foolproof structure (such as a retaining edge) on the material rack for placing multiple negative electrode adapters 233, so that multiple negative electrode adapters 233 are placed on the material rack in a correct posture with a consistent orientation, preventing any negative electrode adapter 233 from being placed upside down, ensuring that when the negative electrode adapter 233 is picked up and installed on the insulating bracket 236, the first surface provided with the recessed portion 2334 can be away from the negative electrode column 231, ensuring that the first connection portion 2332 is correctly welded to the second end of the negative electrode column 231, which is conducive to improving the efficiency of automated processing.
  • the foolproof structure such as a retaining edge
  • one end of one of the second connection parts 2333 of the negative electrode adapter 233 close to the first connection part 2332 may be provided with two anti-mistaken corners 2335, and the two anti-mistaken corners 2335 are respectively located at different side corners of the end of the second connection part 2333;
  • one end of each of the second connection parts 2333 of the negative electrode adapter 233 close to the first connection part 2332 may be provided with one anti-mistaken corner 2335, and one of the anti-mistaken corners 2335 on the second connection part 2333 335 is located at a side corner of the end of the second connection part 2333 close to the first connection part 2332, and the anti-mistake corner 2335 on another second connection part 2333 is located at a side corner of the end of the second connection part 2333 away from the first connection part 2332;
  • one end of one of the second connection parts 2333 of the negative electrode conversion plate 233 close to the first connection part 2332 can be provided with only
  • one end of one of the second connection parts 2333 of the negative electrode adapter 233 close to the first connection part 2332 is provided with the anti-mistaken corner 2335, and the anti-mistaken corner 2335 is located at a side corner of the end of the second connection part 2333 close to the first connection part 2332.
  • only one anti-mistaken corner 2335 is provided on one of the second connection parts 2333 of the negative electrode adapter 233, which is simple to process; furthermore, please refer to FIG. 9 and FIG.
  • the first sheet body 2211 of the negative electrode ear 221 is connected to the corresponding negative electrode adapter
  • the second connection part 2333 of the sheet 233 When the second connection part 2333 of the sheet 233 is connected, one end of the first sheet-like main body 2211 is located at a position where the second connection part 2333 is close to the adapter sheet body 2331, and extends from this position in a direction away from the adapter sheet body 2331 and covers the second connection part 2333 to its edge.
  • the anti-missing corner 2335 is arranged at a side corner of the end of the second connection part 2333 close to the first connection part 2332 to avoid interfering with the connection between the first sheet-like main body 2211 and the second connection part 2333, avoid affecting the reliability of its conductive connection, and help to further improve the cycle performance of the battery cell 20.
  • the negative electrode adapter plate 233 preferably adopts an integrated structure, that is, the adapter plate body 2331, the first connecting part 2332 and the second connecting part 2333 of the negative electrode adapter plate 233 are made of the same metal sheet (generally copper) by stamping, mechanical cutting or laser cutting, and the manufacturing process is simple and fast.
  • the positive electrode adapter 234 also includes an adapter body, a first connection portion and at least one second connection portion, and its structure is substantially the same as that of the negative electrode adapter 233, which is not described in detail.
  • the positive electrode adapter 234 can also be provided with the recessed portion 2334 on the surface of the first connection portion facing away from the positive electrode column 232, and at least one anti-missing corner 2335 is provided on one end of at least one second connection portion close to the first connection portion, which can achieve the same effect as above, which is not described in detail.
  • the battery cell 20 also includes a plurality of protective sheets 24, each of the second connecting portions 2333 of the negative electrode adapter sheet 233 is correspondingly provided with a protective sheet 24, and the negative electrode ear 221 connected to the second connecting portion 2333 is connected between the protective sheet 24 and the second connecting portion 2333.
  • the first sheet body 2211 of the negative electrode ear 221 is located between the protective sheet 24 and the second connecting portion 2333.
  • the protective sheet 24 between the first sheet body 2211 of the negative electrode ear 221 and the corresponding second connecting portion 2333, the first sheet body 2211 can be prevented from being welded through when being welded to the second connecting portion 2333, which is conducive to ensuring reliable welding between the second connecting portion 2333 and the negative electrode ear 221.
  • the protective sheet 24 adopts a double-layer structure, so that it can not only improve its own overall structural strength and prevent the protective sheet 24 from being bent during transportation or installation, but also ensure the degree of fit with the first sheet body 2211 of the negative electrode ear 221 and the negative electrode conversion sheet 233, thereby ensuring the welding reliability among the three.
  • the protection sheet 24 is made of a metal sheet, and the metal sheet includes a first protection sub-sheet 241 and two second protection sub-sheets 242 connected to the first protection sub-sheet 241 on opposite sides in the width direction.
  • the two second protection sub-sheets 242 are folded at an angle relative to the first protection sub-sheet 241 and are arranged on the same side of the first protection sub-sheet 241 in the thickness direction, and a gap is left between the two second protection sub-sheets 242 along the width direction of the cover plate 235, thereby forming the double-layer structure.
  • the two second protection sub-sheets 242 and the first protection sub-sheet 241 are an integral structure, and no other connection structure is required, thereby reducing the manufacturing cost of the protection sheet 24; furthermore, the two second protection sub-sheets 242 can be stacked with the first protection sub-sheet 241 to form a double-layer structure through bending and stamping processes, which is convenient for processing, and after the two second protection sub-sheets 242 are folded relative to the first protection sub-sheet 241, the edges of the two second protection sub-sheets 242 on the opposite sides form an arc angle, which can avoid scratching the negative electrode ear 221 when pressing the negative electrode ear 221.
  • the two second protection sub-sheets 242 are stacked on the first protection sub-sheet 241 after being folded relative to the first protection sub-sheet 241, that is, the angle between the second protection sub-sheet 242 and the first protection sub-sheet 241 is zero.
  • the first protection sub-sheet 241 may be attached to the first sheet-like body 2211, or the two second protection sub-sheets 242 may be attached to the first sheet-like body 2211.
  • the first protection sub-sheet 241 is attached to the first sheet-like body 2211, and the two second protection sub-sheets 242 are stacked on the side of the first protection sub-sheet 241 away from the first sheet-like body 2211.
  • the two second protection sub-sheets 242 are stacked on the side of the first protection sub-sheet 241 away from the first sheet-like body 2211.
  • each of the second protection sub-sheets 242 in the length direction is close to another second protection sub-sheet 242.
  • the corners are provided with indentations 243, and the two indentations 243 at the same end of the two second protection sub-sheets 242 in the length direction are connected to form a receiving space.
  • the first protection sub-sheet 241 is provided with a stopper 244 at at least one end in the length direction, and the stopper 244 is partially received in the receiving space formed by the connection of the two indentations 243. It is not difficult to understand that by arranging the stopper 244 in the receiving space formed by the two inward-contracted notches 243, when the ends of the two second protection sub-sheets 242 contact the negative electrode ear 221, the stopper 244 will preferentially contact the negative electrode ear 221, thereby supporting the corners of the second protection sub-sheet 242 for a certain distance, which is beneficial to further prevent the corners of the second protection sub-sheet 242 from scratching the negative electrode ear 221.
  • each of the second protection sub-sheets 242 is provided with an inward-contracted notch 243 at each end in the length direction near the corner of another second protection sub-sheet 242, and the first protection sub-sheet 241 is provided with a stopper 244 at each end in the length direction.
  • the stopper 244 may be an extension piece connected to the end of the first protection sub-piece 241, and the extension piece is folded 90 degrees relative to the first protection sub-piece 241 to form the stopper 244.
  • the stopper 244 may also be a protruding structure directly protruding from the end of the first protection sub-piece 241 facing the two second protection sub-pieces 242.
  • the extension piece and the protruding structure are preferably provided with rounded corners to avoid scratching the negative electrode ear 221.
  • each of the second connecting portions of the positive electrode adapter 234 may also be provided with a corresponding protective sheet 24, so as to ensure effective welding between the second connecting portion of the positive electrode adapter 234 and the positive electrode ear 222, which will not be elaborated herein.
  • the material of the protective sheet 24 can be metal such as copper and aluminum, and is preferably the same as the material of the corresponding adapter sheet, that is, when the protective sheet 24 corresponds to the second connecting portion 2333 of the negative electrode adapter sheet 233, the material of the protective sheet 24 is the same as that of the negative electrode adapter sheet 233 (generally copper); when the protective sheet 24 corresponds to the second connecting portion of the positive electrode adapter sheet 234, the material of the protective sheet 24 is the same as that of the positive electrode adapter sheet 234 (generally aluminum).
  • the end cover assembly 23 also includes other components such as an explosion-proof valve 237, an explosion-proof valve protection sheet 238, and a stress member 239.
  • an explosion-proof valve 237 an explosion-proof valve protection sheet 2348
  • a stress member 2319 The structure of the end cover assembly 23 will be further described in detail in conjunction with the accompanying drawings.
  • the cover plate 235 is a rectangular plate body, and is provided with two first assembly holes 2351 penetrating through opposite sides thereof, a pressure relief hole 2352, a liquid injection hole 2353 and a mounting hole 2354 along the thickness direction.
  • the two first assembly holes 2351 are located at opposite ends of the cover plate 235 in the length direction, so as to allow the negative pole 231 and the positive pole 232 to pass through, respectively.
  • the pressure relief hole 2352 is located in the middle of the cover plate 235, and the explosion-proof valve 237 and the explosion-proof valve protection sheet 238 are respectively provided at the openings on opposite sides of the pressure relief hole 2352.
  • the explosion-proof valve 237 is arranged on the side of the cover plate 235 facing the electrode assembly 22 and covers the opening of the pressure relief hole 2352 on one side close to the electrode assembly 22.
  • the explosion-proof valve 237 is used to cause effective explosion when the battery cell 20 is in thermal runaway to avoid the explosion of the battery cell 20.
  • the explosion-proof valve protection sheet 238 is arranged on the side of the cover plate 235 away from the electrode assembly 22 and covers the opening of the pressure relief hole 2352 on one side away from the electrode assembly 22.
  • the explosion-proof valve protection sheet 238 is used to prevent dust and the like from adhering to the explosion-proof valve 237 to ensure that the explosion-proof valve 237 can be normally exploded.
  • the explosion-proof valve 237 and the explosion-proof valve protection sheet 238 can adopt existing explosion-proof valves and explosion-proof valve protection sheets, and their functions and working principles are not described in detail here.
  • the insulating bracket 236 is a bracket that is roughly in the shape of a rectangular plate.
  • the insulating bracket 236 is provided with second assembly holes 2361 at opposite ends in the length direction.
  • the two second assembly holes 2361 pass through the opposite sides of the insulating bracket 236 in the thickness direction and are respectively connected with the two first assembly holes 2351 on the cover plate 235.
  • the connected second assembly holes 2361 and the first assembly holes 2351 are used to install a corresponding pole.
  • the insulating bracket 236 is provided with a first hollow structure 2362 at a position corresponding to the pressure relief hole 2352.
  • the first hollow structure 2362 is used for the gas generated when the battery cell 20 thermally runs away to pass through and gather under the explosion-proof valve 237.
  • the insulating bracket 236 is provided with a first hollow structure 2362 at the corresponding A through hole (not numbered in the figure) is provided at the injection hole 2353, so that the electrolyte can be injected into the shell 21 through the connected injection hole 2353 and the through hole, thereby infiltrating the electrode assembly 22.
  • the insulating bracket 236 is provided with a second hollow structure 2363 at a position corresponding to the mounting hole 2354, and the second hollow structure 2363 has a plurality of hollow hole portions 2363a, and at least one of the hollow hole portions 2363a passes through the insulating bracket 236 along the thickness direction of the cover plate 235, and at least a portion of the stressor 239 can be detected by the visual system through at least one of the hollow hole portions 2363a on the second hollow structure 2363 (further description will be provided later).
  • the first hollow structure 2362 includes hollow grooves and/or hollow holes, which can be used as long as gas can pass through, and there is no limitation on this; the hollow hole portion 2363a on the second hollow structure 2363 can also include hollow grooves and/or hollow holes, which can be used as long as the stressor 239 can be seen through at least one of the hollow hole portions 2363a, and there is no limitation on this.
  • the first hollow structure 2362 includes a plurality of circular hollow holes, and each of the hollow hole portions 2363a of the second hollow structure 2363 is a square hollow hole extending along the length direction of the cover plate 235, and there are connecting ribs between adjacent square hollow holes.
  • the portion of the insulating bracket 236 for opening the second assembly hole 2361 and the second hollow structure 2363 is a convex structure on the side facing the cover plate 235, and the side of the cover plate 235 facing the insulating bracket 236 is respectively provided with a first sinking groove 2355 and a second sinking groove 2356, wherein one of the first assembly holes 2351 and the adjacent mounting hole 2354 are located in the first sinking groove 2355, and the other first assembly hole 2351 is located in the In the second recessed groove 2356, when the insulating bracket 236 is installed on one side of the cover plate 235, the protruding structure corresponding to the location of one of the second assembly holes 2361 and the adjacent second hollow structure 2363 is received in the first recessed groove 2355, and the protruding structure corresponding to the location of the other second assembly hole 2361 is received in the second recessed groove 2356, the second assembly holes 2361 are connected to the first assembly holes
  • the first recessed groove 2355 and the second recessed groove 2356 are respectively provided on the side of the cover plate 235 facing the insulating bracket 236 to receive the protruding structure on the insulating bracket 236, so as to play a positioning role, facilitate the quick installation of the insulating bracket 236 on one side of the cover plate 235, and prevent the insulating bracket 236 from moving relative to the cover plate 235.
  • each of the poles includes a column portion and a flange portion, wherein the column portion is the first end of the pole, and the flange portion is the second end of the pole.
  • the negative pole 231 includes a column portion 2311 and a flange portion 2312 connected to one end of the column portion 2311; referring to FIG.
  • the positive electrode column 232 is inserted into the cover plate 235 and the insulating bracket 236, the columnar portion of the positive electrode column 232 is inserted into another first assembly hole 2351 and its corresponding connected second assembly hole 2361, and the flange portion of the positive electrode column 232 is exposed on the side of the insulating bracket 236 away from the cover plate 235 for welding the first connecting portion of the positive electrode adapter 234.
  • the insulating bracket 236 has two mounting grooves on one side facing away from the cover plate 235, and the second end of each pole is adapted and mounted in a corresponding mounting groove.
  • the insulating bracket 236 has a third recessed groove 2364 and a fourth recessed groove 2365 on one side facing away from the cover plate 235, the third recessed groove 2364 is used to receive the flange portion 2312 of the negative pole 231, and the fourth recessed groove 2365 is used to receive the flange portion of the positive pole 232.
  • the third recess 2364 and the fourth recess 2365 are respectively opened on the side of the insulating bracket 236 away from the cover plate 235 to respectively accommodate the flange parts of the negative electrode column 231 and the positive electrode column 232, which can play a positioning role, facilitate the rapid installation of the electrode column on the cover plate 235 and the insulating bracket 236, and also prevent the movement of the electrode column.
  • the ends of the body of the negative pole 231 and the positive pole 232 away from the flange part thereof are both passed through the side of the cover plate 235 away from the insulating bracket 236 to be electrically connected to the corresponding conductive voltage block.
  • the end of the body 2311 of the negative pole 231 away from the flange part 2312 is passed through the cover plate 235 and is welded to a negative conductive voltage block.
  • the joint surface of the pressing block 2314 i.e., the surface of the negative conductive voltage block 2314 facing away from the cover plate 235; similarly, the end of the column portion of the positive column 232 away from the flange portion passes through the cover plate 235 and is welded to the joint surface of a positive conductive voltage block 2324.
  • the negative column 231 and the positive column 232 each pass through one end (i.e., the column portion) of the cover plate 235 and are welded to a corresponding conductive voltage block, and the other end (i.e., the flange portion) of the negative column 231 and the positive column 232 is received in the sink groove on the insulating bracket 236, so that the opposite ends of the negative column 231 and the positive column 232 can be fixed, and the negative column 231 and the positive column 232 have a larger connection area after being welded to the conductive voltage block, which is more convenient as a power terminal.
  • the negative conductive voltage block 2314 and the positive conductive voltage block 2324 are respectively provided with through holes for passing the ends of the corresponding poles, so as to increase the connection area between the corresponding poles and the conductive voltage blocks, which helps to improve the reliability of electrical connection.
  • a negative separator 2315 is provided between the negative electrode column 231 and the negative conductive voltage block 2314
  • a positive separator 2325 is provided between the positive electrode column 232 and the positive conductive voltage block 2324 .
  • a negative separator 2315 is provided between the negative electrode column 231 and the negative conductive voltage block 2314
  • a positive separator 2325 is provided between the positive electrode column 232 and the positive conductive voltage block 2324 .
  • the positive separator 2325 is a plastic gasket provided on the side of the cover plate 235 away from the insulating support 236, and the plastic gasket is sandwiched between the positive conductive voltage block 2324 and the cover plate 235;
  • the negative separator 2315 is a plastic sleeve provided on the side of the cover plate 235 away from the insulating support 236, and an opening is provided on the side of the plastic sleeve away from the cover plate 235 and at one end away from the mounting hole 2354, and the negative conductive voltage block 2314 is inserted into the plastic sleeve from the opening, and the portion where the negative conductive voltage block 2314 is welded to the negative pole 231 is exposed through the opening.
  • the negative separator 2315 and the positive separator 2325 are respectively provided with through holes on the side facing the cover plate 235 for the ends of the corresponding poles to pass through.
  • the negative conductive voltage block 2314 specifically includes a block body (unnumbered) for welding the end of the negative electrode column 231 and an extension body (unnumbered) located on the side of the block body close to the mounting hole 2354.
  • a through hole connected to the mounting hole 2354 is also provided on the side of the negative separator 2315 facing the cover plate 235, and the extension body is opposite to the stress piece 239 installed in the mounting hole 2354 (see FIG6 ).
  • the stressor 239 is electrically connected to the cover plate 235, and the cover plate 235 is electrically connected to the positive conductive voltage block 2324.
  • the stressor 239 When the internal pressure of the battery cell 20 due to thermal runaway exceeds the reference pressure of the stressor 239, the stressor 239 will flip under the action of air pressure and make electrical contact with the extension of the negative conductive voltage block 2314.
  • the negative electrode column 231 and the positive electrode column 232 are connected through the cover plate 235, so that the positive and negative electrode ears in the electrode assembly 22 are externally short-circuited, thereby reducing the risk of explosion and fire of the battery cell 20 and improving the safety of the battery cell 20.
  • the cover plate 235 may also open the mounting hole 2354 at a position adjacent to the positive pole column 232, the positive conductive voltage block 2324 is correspondingly provided with the extension body, and the negative conductive voltage block 2314 is electrically connected to the cover plate 235, so that the stress member 239 will flip over under the action of air pressure and electrically contact with the extension body of the positive conductive voltage block 2324, and the same effect as above can also be achieved.
  • the negative electrode adapter plate 233 and the positive electrode adapter plate 234 are respectively arranged at the opposite ends of the side of the insulating bracket 236 away from the cover plate 235 along the direction of the cover plate 235, and the first connecting portion of each adapter plate is located on the side of the adapter plate body of the adapter plate away from the middle of the cover plate 235, so as to be used for laser welding with the exposed portion of the corresponding pole (i.e., the flange portion).
  • the adapter plate body 2331 of the negative electrode adapter plate 233 is provided with a through hole 2336.
  • the through hole 2336 is correspondingly connected to one of the hollow hole portions 2363a, so that at least part of the stress member 239 is visually displayed in the connected hollow hole portion 2363a and the through hole 2336.
  • a machine vision system is used to detect whether there is any reflection of the stress component 239 through the connected through hole 2336 and the hollow hole portion 2363a of the second hollow structure 2363, so as to determine whether the negative electrode adapter plate 233 is correctly installed on the insulating bracket 236, which is beneficial to improving the production efficiency of automated production.
  • the through hole 2336 is too small, the precision requirement of the probe of the machine vision system to align with the through hole 2336 will be increased, and if the through hole 2336 is too large, it will not only reduce the structural strength of the adapter body 2331, but also increase the fault tolerance space of the negative electrode adapter 233.
  • the negative electrode adapter 233 may be tilted and not installed in position, but because the through hole 2336 is too large, the reflection of the stress piece 239 can still be detected and the negative electrode adapter 233 is mistakenly considered to be installed in position. Therefore, the size of the through hole 2336 should be reasonably designed.
  • the diameter of the through hole 2336 is preferably 3.5mm-4.5mm.
  • the size of the positive projection of the hollow hole portion 2363a on the cover plate 235 away from the side of the negative electrode column 231 i.e., the width of the hollow hole portion 2363a along the width direction of the cover plate 235
  • the diameter of the through hole 2336 is less than or equal to the diameter of the through hole 2336.
  • the width of the hollow hole portion 2363a By limiting the width of the hollow hole portion 2363a to be less than or equal to the diameter of the through hole 2336, it can be ensured that the reflection of the stress member 239 through the hollow hole portion 2363a can pass through the through hole 2336 connected to the hollow hole portion 2363a, and then be detected, thereby determining whether the negative electrode adapter 233 is correctly installed on the insulating bracket 236.
  • the stress member 239 can be arranged at a position of the cover plate 235 adjacent to the positive electrode column 232, that is, the cover plate 235 can open a mounting hole 2354 for installing the stress member 239 at a position adjacent to the positive electrode column 232, and the insulating bracket 236 can be correspondingly provided with the second hollow structure 2363 at a position adjacent to the positive electrode column 232. Accordingly, a through hole connecting the hollow hole portion 2363a of the second hollow structure 2363 can be opened on the adapter plate body of the positive adapter plate 234 to expose part of the stress member 239.
  • the insulating bracket 236 is composed of a first sub-insulating bracket 2368 and a second sub-insulating bracket 2369.
  • the negative electrode adapter 233 and the positive electrode adapter 234 are respectively mounted on the first sub-insulating bracket 2368 and the second sub-insulating bracket 2369.
  • the insulating bracket 236 is composed of two insulating brackets, which can simplify the structure of a single bracket and facilitate processing.
  • the insulating bracket 236 can also be an integrated structure.
  • the first end of the first sub-insulating bracket 2368 on the side facing away from the cover plate 235 forms a first boss 2368a
  • the first boss 2368a is provided with a clearance groove 2366 on the side wall close to the first connecting part 2332
  • the first end of the first connecting part 2332 is connected to the side of the adapter plate body 2331 away from the middle of the cover plate 235, and the second end of the first connecting part 2332 away from the adapter plate body 2331 is accommodated in the clearance groove 2366.
  • the installation of the negative electrode adapter plate 233 can be guided and positioned, which facilitates the rapid installation of the negative electrode adapter plate 233 and improves the assembly efficiency of the battery cell 20.
  • the distance between the groove wall of the installation groove (i.e., the third groove 2364) of the second end (i.e., the flange portion 2312) of the negative electrode column 231 and the groove wall corresponding to the give-way groove 2366 is H1 (see Figure 15), wherein 15% ⁇ H1/b ⁇ 20%.
  • the recessed portion 2334 can be aligned with the second end of the negative electrode column 231, thereby ensuring reliable welding between the first connection portion 2332 of the negative electrode adapter 233 and the second end of the negative electrode column 231.
  • the distance between the groove wall of the clearance groove 2366 and the groove wall corresponding to the third sink groove 2364 is d1 (See Figure 15)
  • the length of the flange portion 2312 of the negative electrode column 231 is d2 (see Figure 9)
  • the length of the recessed portion 2334 is d3 (see Figure 8)
  • the distance between the edge of the first connecting portion 2332 and the edge corresponding to the recessed portion 2334 is d4 (see Figure 8), wherein 15% ⁇ d1/d2 ⁇ 20%, 80% ⁇ d3/d2 ⁇ 85%, and 15% ⁇ d4/d2 ⁇ 20%.
  • the negative electrode conversion plate 233 has only the smooth area without the recessed portion 2334 extending into the make way groove 2366 under the maximum extension area, and the recessed portion 2334 can still be aligned with the flange portion 2312 of the negative electrode column 231, thereby ensuring that reliable welding between the first connecting portion 2332 of the negative electrode conversion plate 233 and the second end of the negative electrode column 231 can be achieved by aligning with the recessed portion 2334.
  • a second boss 2368b is formed on the second end of the first sub-insulating bracket 2368 on the side away from the cover plate 235, and a plurality of ribs 2367 are provided on the side of the second boss 2368b close to the first connecting portion 2332.
  • the plurality of ribs 2367 are arranged at intervals along the width direction of the cover plate 235.
  • a clearance notch 2337 is provided on the side of the adapter body 2331 away from the first connecting portion 2332, and the plurality of ribs 2367 are at least partially accommodated in the clearance notch 2337.
  • the clearance notch 2337 to accommodate the plurality of convex ribs 2367, it can also play a guiding and positioning role when the negative electrode adapter 233 is installed on the insulating bracket 236, so that the two ends of the negative electrode adapter 233 along the length direction of the cover plate 235 are respectively limited by the clearance groove 2366 and the convex rib 2367, which is convenient for quickly installing the negative electrode adapter 233 and further improving the assembly efficiency of the battery cell 20.
  • the plurality of convex ribs 2367 are used to ensure the surface flatness of the region of the insulating bracket 236 adjacent to the first hollow structure 2362, which will not be described in detail.
  • the side wall of the second sub-insulating bracket 2369 of the insulating bracket 236 close to the first connecting part of the positive electrode adapter 234 in the length direction of the cover plate 235 may also be provided with a clearance groove, and the end of the first connecting part of the positive electrode adapter 234 is correspondingly accommodated in the clearance groove, which can also play a role in positioning and guiding, and facilitate the installation of the positive electrode adapter 234.
  • a clearance notch may be provided on the side of the adapter body of the positive electrode adapter 234 away from the first connecting part, and a convex rib or a limiting column is correspondingly provided on the second sub-insulating bracket 2369, so as to realize the positioning and guiding function of the positive electrode adapter 234 through the cooperation of the clearance notch and the convex rib or the limiting column, which will not be described in detail.
  • the end cover assembly 23 also includes some other components, such as the sealing nails, sealing aluminum nails and cover patch 230 shown in Figures 13 and 14.
  • the sealing nails are used to be inserted into the through holes connected to the injection hole 2353 on the insulating bracket 236 to achieve temporary sealing in the process of the battery cell 20.
  • the sealing aluminum nails are used to weld and seal the injection hole 2353 after the electrolyte is injected.
  • the cover patch 230 is used to insulate the cover 235 from the box assembly 10 of the energy storage device 1.
  • the end cover assembly 23 also includes components not shown, such as an insulating film for covering the outer wall of the shell 21, which will not be described in detail.
  • an embodiment of the present invention further provides an electric device, which includes an electric device body and the energy storage device 1 provided in the embodiment of the present invention, and the energy storage device 1 is used to supply power to the electric device body. Since the energy storage device 1 includes all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
  • the electrical equipment may be, but is not limited to, electronic devices such as mobile phones, tablet computers, laptop computers, desktop computers, smart bracelets, smart watches, e-readers, game consoles, toys, and the aforementioned household energy storage system, and there is no limitation on this.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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Abstract

本发明提供端盖组件(23)、储能装置(1)以及用电设备。端盖组件(23)包括盖板(235)、设于盖板(235)一侧的绝缘支架(236)、穿装于盖板(235)和绝缘支架(236)中的极柱、以及转接片。极柱的第二端位于绝缘支架(236)背离盖板(235)的一侧。转接片包括第一连接部(2332)。第一连接部(2332)连接极柱的第二端。第一连接部(2332)背离极柱的表面设有凹陷部(2334)。沿盖板(235)的宽度方向，第一连接部(2332)的宽度为a，极柱第二端的宽度为b，凹陷部(2334)的边缘与第一连接部(2332)对应的边缘之间的距离为c，a＞b，85％≤b/a，15％≤c/a≤20％。

Description

端盖组件、储能装置以及用电设备 技术领域
本发明涉及储能技术领域，尤其涉及一种端盖组件、储能装置以及用电设备。
背景技术
二次电池(例如方形锂离子电池)通常包括壳体、端盖组件和电极组件，壳体和端盖组件配合形成容置腔，电极组件布置在容置腔内。端盖组件包括正极柱和负极柱，电极组件具有正极耳和负极耳，正极耳与正极柱电性连接，负极耳与负极柱电性连接，从而实现电流的导出。
相关技术中，极柱与极耳需要通过转接片实现电性连接。其中，转接片与极柱一般采用激光焊接，具体地，转接片对应极柱的部分一面与极柱贴合、另一面与激光焊接头相对，从而在激光作用下实现转接片与极柱的焊接。然而，现有的转接片与极柱在激光焊接后存在焊接不可靠的风险，使得电池的导电性能不佳，影响电池的组装良率。
发明内容
本发明旨在至少解决现有技术存在的问题之一。为此，本发明提供了一种端盖组件、储能装置以及用电设备，所述端盖组件可以确保实现转接片与负极柱之间的可靠焊接。
为了实现上述目的，第一方面，本发明提供一种端盖组件，包括盖板、设于所述盖板在厚度方向的其中一侧的绝缘支架、以及沿所述厚度方向穿装于所述盖板和所述绝缘支架中的极柱，所述极柱的第一端位于所述盖板的背离所述绝缘支架的一侧，所述极柱的第二端位于所述绝缘支架的背离所述盖板的一侧，所述端盖组件还包括转接片，所述转接片包括：
转接片本体，设于所述绝缘支架的背离所述盖板的一侧；
第一连接部，连接于所述转接片本体在所述盖板的长度方向的其中一侧，所述第一连接部连接所述极柱的第二端；沿所述厚度方向，所述第一连接部具有相背的第一表面和第二表面，所述第一表面背离所述极柱，所述第二表面靠近所述极柱，所述第一表面设有阵列排布的凹陷部；
沿所述盖板的宽度方向，所述第一连接部的宽度为a，所述极柱的第二端的宽度为b，所述凹陷部的边缘与所述第一连接部对应的边缘之间的距离为c，其中，a＞b，85％≤b/a，15％≤c/a≤20％。
一实施例中，所述转接片还包括两个二连接部，所述两个第二连接部分别连接于所述转接片本体在所述盖板的宽度方向的相对两侧，其中一所述第二连接部的靠近所述第一连接部的一端设有防呆缺角，所述防呆缺角位于所在第二连接部的端部的靠近所述第一连接部的一侧边角处。
一实施例中，所述盖板开设有安装孔，所述安装孔沿所述厚度方向贯穿所述盖板，所述绝缘支架在对应所述安装孔的部位开设有镂空结构，所述镂空结构上的至少一个镂空孔部沿所述厚度方向贯穿所述绝缘支架，所述端盖组件还包括设于所述安装孔内的应激件；
所述转接片本体开设有通孔，沿所述盖板的厚度方向，自所述通孔朝向所述盖板看，所述通孔与其中一所述镂空孔部对应连通，至少部分所述应激件可视化显示于连通的所述镂空孔部和所述通孔中。
一实施例中，所述通孔的直径为3.5mm-4.5mm。
一实施例中，沿所述盖板的厚度方向，自所述通孔朝向所述盖板看，所述镂空孔部在所述盖板上的正投影的远离所述极柱的侧边的尺寸小于或者等于所述通孔的直径。
一实施例中，沿所述盖板的长度方向，所述第一连接部的第一端连接于所述转接片本体的远离所述盖板的中部的一侧，所述绝缘支架包括用于设置所述转接片的第一子绝缘支架，所述第一子绝缘支架上的背离所述盖板的一侧的第一端形成第一凸台，所述第一凸台靠近所述第一连接部的侧壁开设有让位槽，所述第一连接部的远离所述转接片本体的第二端收容于所述让位槽内。
一实施例中，所述绝缘支架的背离所述盖板的一侧开设有安装槽，所述极柱的第二端适配并安装于所述安装槽内；
沿所述盖板的宽度方向，所述安装槽的槽壁与所述让位槽对应的槽壁之间的距离为H1，其中，15％≤H1/b≤20％。
一实施例中，所述绝缘支架的背离所述盖板的一侧开设有安装槽，所述极柱的第二端适配并安装于所述安装槽内；
沿所述盖板的长度方向，所述让位槽的槽壁与所述安装槽对应的槽壁之间的距离为d1，所述极柱的第二端的长度为d2，所述凹陷部的长度为d3，所述第一连接部的边缘与所述凹陷部对应的边缘之间的距离为d4，其中，15％≤d1/d2≤20％，80％≤d3/d2≤85％，15％≤d4/d2≤20％。
一实施例中，沿所述盖板的长度方向，所述第一连接部的第一端连接于所述转接片本体的远离所述盖板的中部的一侧，所述绝缘支架包括用于设置所述转接片的第一子绝缘支架，所述第一子绝缘支架上的背离所述盖板的一侧的第二端形成第二凸台，所述第二凸台的靠近所述第一连接部的一侧设置有多条凸筋，所述多条凸筋沿所述盖板的宽度方向间隔设置，所述转接片本体的远离所述第一连接部的一侧设有让位缺口，所述多条凸筋至少部分收容于所述让位缺口内。
第二方面，本发明提供一种储能装置，包括至少一个电池单体，所述电池单体包括壳体、电极组件以及如上任一实施例所述的端盖组件；
其中，所述壳体具有开口和容纳腔，所述电极组件包括极耳，所述转接片包括与所述极耳对应连接的第二连接部，所述电极组件收容于所述容纳腔内，所述端盖组件封装于所述开口处。
一实施例中，所述电池单体还包括多个保护片，所述转接片的每一所述第二连接部对应设置一所述保护片，所述极耳连接于所述保护片和所述第二连接部之间。
一实施例中，所述保护片由金属薄片制成，且所述保护片采用双层结构。
一实施例中，所述金属薄片包括第一保护子片以及连接于所述第一保护子片在宽度方向的相对两侧的两个第二保护子片，所述两个第二保护子片相对所述第一保护子片翻折呈夹角设置并设于所述第一保护子片在厚度方向的同一侧，且所述两个第二保护子片之间沿所述盖板的宽度方向留有间隙。
一实施例中，所述第一保护子片贴接于所述极耳的背离所述第二连接部的一侧，所述两个第二保护子片层叠于所述第一保护子片的背离所述极耳的一侧；
每一所述第二保护子片在长度方向的至少一端靠近另一所述第二保护子片的边角开设内缩缺口，且所述两个第二保护子片在长度方向的同一端的两个所述内缩缺口形成收容空间。
一实施例中，所述第一保护子片在长度方向的至少一端凸设有止挡部，所述止挡部部分收容于两个所述内缩缺口形成的所述收容空间内。
第三方面，本发明提供一种用电设备，包括如上任一实施例所述的储能装置。
与现有技术相比，本发明具有的有益效果为：所述端盖组件中，通过限定所述第一连接部的宽度a与所述负极柱的第二端的宽度b之间的比值，以及限定所述凹陷部的边缘与所述第一连接部对应的边缘之间的距离c与所述第一连接部的宽度a之间的比值，也就限定了所述凹陷部两侧的所述光面区域的最小宽度尺寸是大于等于所述负极柱的第二端相对于所述第一连接部的最大容错空间，也即意味着，即使所述负极柱的第二端与所述第一连接部对位在最大容错空间15％的情况下，只要在所述负极柱的第二端不超出所述第一连接部区域的情况 下，通过识别所述第一连接部上的所述凹陷部所在的区域进行焊接，便可确保实现所述第一连接部与所述负极柱的第二端之间的可靠焊接。再者，所述第一连接部与所述负极柱的第二端采用激光焊接时，设置于所述第一连接部的第一表面上的所述凹陷部，不仅可以增大所述第一表面的粗糙度，减弱所述第一表面对激光的反光作用，避免激光焊接的过程中因反光造成熔珠飞溅甚至爆燃的问题，还可以增加激光在所述第一表面上的斜反射次数，提高所述第一表面对激光的吸收率，有利于避免虚焊或者焊接不良的问题。
本发明的附加方面和优点将在下面的描述内容中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施方式中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施方式，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，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的储能装置在用户侧储能中的应用场景图。
图2是本发明其中一实施例提供的储能装置的立体结构示意图。
图3是图2所示储能装置的局部立体分解结构示意图。
图4是图3所示电池单体的立体结构示意图。
图5是图4所示电池单体的局部立体分解结构示意图。
图6是图4所示电池单体沿A-A方向的局部剖视图。
图7是图5所示端盖组件的仰视图。
图8是图7所示负极转接片的立体结构示意图。
图9是图6所示负极柱、负极转接片以及负极耳的立体结构示意图。
图10是图9所示负极柱、负极转接片以及负极耳在另一视角下的立体结构示意图。
图11是图10所示保护片的立体结构示意图。
图12是图11所示保护片沿B-B方向的剖面图。
图13是图5所示端盖组件的立体分解结构示意图。
图14是图13所示端盖组件在另一视角下的立体分解结构示意图。
图15是图14所示第一子绝缘支架的示意图。
主要附图标记说明：
1-储能装置；2-电能转换装置；3-第一用户负载；4-第二用户负载；10-箱体组件；11-
箱体；111-端板；112-侧板；113-连接框；1131-支撑脚座；114-隔热垫片；12-上盖；20-电池单体；21-壳体；22-电极组件；221-负极耳；2211-第一片状主体；2212-第一连接体；222-正极耳；2221-第二片状主体；2222-第二连接体；23-端盖组件；230-盖板贴片；231-负极柱；2311-柱体部；2312-法兰部；2314-负极导电压块；2315-负极分隔件；232-正极柱；2324-正极导电压块；2325-正极分隔件；233-负极转接片；2331-转接片本体；2332-第一连接部；2333-第二连接部；2334-凹陷部；2335-防呆缺角；2336-通孔；2337-让位缺口；234-正极转接片；235-盖板；2351-第一装配孔；2352-泄压孔；2353-注液孔；2354-安装孔；2355-第一沉槽；2356-第二沉槽；236-绝缘支架；2361-第二装配孔；2362-第一镂空结构；2363-第二镂空结构；2363a-镂空孔部；2364-第三沉槽；2365-第四沉槽；2366-让位槽；2367-凸筋；2368-第一子绝缘支架；2368a-第一凸台；2368b-第二凸台；2369-第二子绝缘支架；237-防爆阀；238-防爆阀保护片；239-应激件；24-保护片；241-第一保护子片；242-第二保护子片；243-内缩缺口；244-止挡部；30-汇流组件。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或 类似的标号表示相同或类似的元件或者具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
为便于理解本发明实施例提供的储能装置，首先对储能技术领域的一些常识做如下说明。
由于人们所需要的能源都具有很强的时间性和空间性，为了合理利用能源并提高能量的利用率，需要通过一种介质或者设备，把一种能量形式用同一种或者转换成另外一种能量形式存储起来，基于未来应用需要再以特定能量形式释放出来。众所周知，要实现碳中和的大目标，目前绿色电能的产生主要途径是发展光伏、风电等绿色能源来替代化石能源，目前绿色电能的产生普遍依赖于光伏、风电、水势等，而风能和太阳能等普遍存在间歇性强、波动性大的问题，会造成电网不稳定，用电高峰电不够，用电低谷电太多，不稳定的电压还会对电力造成损害，因此可能因为用电需求不足或者电网接纳能力不足，引发“弃风弃光”的问题，要解决这些问题须依赖储能。即将电能通过物理或者化学的手段转化为其他形式的能量存储起来，在需要的时候将能量转化为电能释放出来，简单来说，储能就类似一个大型“充电宝”，在光伏、风能充足时，将电能储存起来，在需要时释放储能的电力。
以电化学储能为例，本发明实施例提供了一种储能装置，所述储能装置内设置有化学电池，主要是利用化学电池内的化学元素做储能介质，充放电过程伴随储能介质的化学反应或者变化，简单说就是把风能和太阳能产生的电能存在化学电池中，在外部电能的使用达到高峰时再将存储的电量释放出来使用，或者转移给电量紧缺的地方再使用。
目前的储能(即能量存储)应用场景较为广泛，包括发电侧储能、电网侧储能、可再生能源并网储能以及用户侧储能等方面，对应的储能装置的种类包括有：
(1)应用在电网侧储能场景的大型储能集装箱，其可作为电网中优质的有功无功调节电源，实现电能在时间和空间上的负荷匹配，增强可再生能源消纳能力，并且在电网系统备用、缓解高峰负荷供电压力和调峰调频方面意义重大；
(2)应用在用户侧的工商业储能场景(银行、商场等)的中小型储能电柜以及应用在用户侧的家庭储能场景的户用小型储能箱，主要运行模式为“削峰填谷”。由于根据用电量需求在峰谷位置的电费存在较大的价格差异，用户有储能设备后，为了减少成本，通常在电价低谷期，对储能柜/箱进行充电处理；电价高峰期，再将储能设备中的电放出来进行使用，以达到节省电费的目的。另外，在边远地区，以及地震、飓风等自然灾害高发的地区，家用储能装置的存在，相当于用户为自己和电网提供了备用电源，免除由于灾害或其他原因导致的频繁断电带来的不便。
请参阅图1，本发明实施例以用户侧储能中的家用储能场景为例，对本发明实施例提供的储能装置1进行说明。当然，本发明实施例提供的储能装置1并不限定于家用储能场景。
如图1所示，本发明实施例提供一种户用储能系统，所述户用储能系统包括电能转换装置2(光伏板)、第一用户负载3(路灯)、第二用户负载4(例如空调等家用电器)等以及储能装置1，所述储能装置1为小型储能箱，可通过壁挂方式安装于室外墙壁。具体的，光伏板可以在电价低谷时期将太阳能转换为电能，所述储能装置1用于储存该电能并在电价高峰时供给路灯和家用电器进行使用，或者在电网断电/停电时进行供电。
可以理解的是，在本发明的实施例中，所述储能装置1可包括但不限于电池单体、电池模组、电池包、电池系统等。当所述储能装置1为电池单体时，其可为方形电池。
下面将结合图2至图14，对本发明实施例提供的所述储能装置1进行详细描述。
如图2及图3所示，本发明实施例提供的所述储能装置1包括箱体组件10以及收容安装于所述箱体组件10内的至少一个电池单体20。优选地，在本发明的实施例中，所述储能装置1包括多个所述电池单体20，多个所述电池单体20通过汇流组件30实现串联电连接、或者并联电连接、亦或者部分串联电连接而另一部分并联电连接，对此不作限定。具体的，在图3的示例中，所述储能装置1包括多个所述电池单体20，并且通过所述汇流组件30实现串联电连接，使得所述储能装置1的总体电容量较大，可满足用户的不同用电需求。需要说明的是，所述汇流组件30可包括但不限于汇流巴片、连接导线等，在图3的示例中，所述汇 流组件30包括多个汇流巴片以实现多个所述电池单体20的串联，其中，在串联方向上的首尾两端的两个汇流巴片外露于所述箱体组件10，以作为所述储能装置1的正负极输出端，实现电能传输。
如图2及图3所示，在本发明的实施例中，所述箱体组件10包括具有上开口的箱体11以及用于盖合所述箱体11的上开口的上盖12，多个所述电池单体20沿所述箱体11的长度方向并排收容于所述箱体11内。其中，在图2及图3的示例中，所述箱体11可以包括一对端板111、一对侧板112以及多个连接框113组成，所述一对端板111和所述一对侧板112围合形成具有上下两个开口的收容空间，所述多个连接框113沿所述箱体11的长度方向间隔设置于所述收容空间内，并且每一所述连接框113沿所述箱体11的宽度方向的相对两端分别固定连接于所述一对侧板112，每相邻的两个所述连接框113邻近下开口的一侧相对设置有多对支撑脚座1131，所述多对支撑脚座1131用于承载安装于相邻的两个所述连接框113之间的所述电池单体20。当然，在其他实施例中，所述箱体11也可以是其他结构的箱体，例如由一对端板111、一对侧板112以及一个底板围合组成的具有上开口的箱体，只要所述箱体11能够收容所述电池单体20即可，具体结构不作限定。可选地，在本发明的实施例中，所述上盖12可以通过卡合连接或者螺纹连接等任一种方式可拆卸连接于所述箱体11，方便于所述箱体组件10的拆装。优选地，如图3所示，在本发明的实施例中，每相邻的两个所述电池单体20之间还夹设有一隔热垫片114，以实现相邻两个所述电池单体20之间的热隔离，有助于提高所述电池单体20的安全性能。
请结合图4至图6，在本发明的实施例中，所述电池单体20包括壳体21、电极组件22以及端盖组件23。所述壳体21具有上开口以及容纳腔，所述电极组件22收容于所述容纳腔内，所述端盖组件23封装于所述开口处。
在本发明的实施例中，所述电极组件22的数量可以为一个或者多个。优选地，为了提高所述电池单体20的电容量以及所述储能装置1的总体电容量，每一个所述电池单体20包括沿所述壳体21的宽度方向堆叠的多个所述电极组件22，多个所述电极组件22之间的电连接方式不作限定。具体的，在图5的示例中，所述电池单体20包括两个所述电极组件22，每一个所述电极组件22包括并联的两个电极子组件。其中，所述电极子组件可以采用现有的卷绕式电极组件，也可以采用现有的叠片式电极组件，对此不作赘述。
需要说明的是，如图5所示，每一所述电极组件22具有负极耳221和正极耳222，所述负极耳221和所述正极耳222分别位于所述电极组件22的长度方向的相对两端。在本发明的其中一实施例中，每一所述极耳均包括片状主体以及一端连接于所述片状主体的连接体，所述连接体的另一端连接所述电极组件22，所述片状主体平行或者大致平行于所述端盖组件23中的盖板235(后文有相关描述)。其中，每一所述极耳的片状主体和连接体优选为一体结构，并通过冲压、翻折等工艺制成。具体的，在图5的示例中，所述负极耳221包括第一片状主体2211和第一连接体2212，所述正极耳222包括第二片状主体2221和第二连接体2222，所述第一片状主体2211和所述第二片状主体2221分别用于连接所述端盖组件23中的负极柱231和正极柱232(后文有相关描述)，从而实现所述电极组件22的电能传输。
如图5及图6所示，所述端盖组件23包括负极柱231和正极柱232、以及负极转接片233和正极转接片234，所述负极柱231通过所述负极转接片233对应电连接于每一所述电极组件22的所述负极耳221的第一片状主体2211，所述正极柱232通过所述正极转接片234对应电连接于每一所述电极组件22的所述正极耳222的第二片状主体2221，如此，所述电池单体20中的两个所述电极组件22实现并联，每一所述电极组件22均能够通过所述一对极柱外接用电源或者供电源实现电能传输。
请结合图5至图7，在本发明的实施例中，所述端盖组件23还包括盖板235以及设于所述盖板235在厚度方向的其中一侧的绝缘支架236，所述负极柱231和所述正极柱232沿所述厚度方向穿装于所述盖板235和所述绝缘支架236中，且分别位于所述盖板235的长度方向的相对两端。其中，如图6所示，每一所述极柱的第一端(即远离所述绝缘支架236的一 端)位于所述盖板235的背离所述绝缘支架236的一侧，每一所述极柱的第二端(即远离所述盖板235的一端)位于所述绝缘支架236的背离所述盖板235的一侧，每一所述极柱的第二端与对应的转接片电连接，进而通过所述转接片电连接于对应的极耳。
在本发明的实施例中，所述转接片具有不同的连接部，所述极柱及其对应的所述极耳分别电连接于所述转接片的不同连接部。具体的，请结合图7至图10，所述负极转接片233与所述正极转接片234的结构基本相同，下面以所述负极转接片233为例详细说明本发明实施例中的转接片的结构。如图7至图10所示，所述负极转接片233包括转接片本体2331、第一连接部2332以及至少一个第二连接部2333。其中，所述转接片本体2331设于所述绝缘支架236的背离所述盖板235的一侧(见图7)，所述第一连接部2332连接于所述转接片本体2331在所述盖板235的长度方向的其中一侧，且所述第一连接部2332覆盖所述负极柱231的第二端(见图6)，所述至少一个第二连接部2333连接于所述转接片本体2331在所述盖板235的宽度方向的至少一侧(见图7)。其中，如图9及图10所示，所述第一连接部2332电连接所述负极柱231的第二端，每一所述第二连接部2333电连接对应的所述电极组件22的负极耳221。在图8至图10的示例中，所述负极转接片233大致呈“山”字型，其包括两个第二连接部2333，且所述两个第二连接部2333分别连接于所述转接片本体2331在所述盖板235的宽度方向的相对两侧，以分别用于电连接并联的两个所述电极组件22的两个所述负极耳221。在其他实施例中，所述电池单体20包括一个所述电极组件22时，所述负极转接片233可以只包括一个所述第二连接部2333，以用于电连接所述电极组件22的负极耳221。
更具体的，如图7至图10所示，在本发明的实施例中，沿所述盖板235的厚度方向，所述第一连接部2332具有相背的第一表面(即背离所述负极柱231的一面)和第二表面(即靠近并面向所述负极柱231的一面)，所述第一表面用于接受激光的照射或者接受超声焊头的冲击以使所述第二表面焊接于所述负极柱231的第二端，即所述第一连接部2332与所述负极柱231可以通过激光焊接或者超声焊接实现电连接。在图7至图10的示例中，所述第一连接部2332优选采用激光焊接的方式电连接于所述负极柱231的第二端，焊接牢固性好且结构稳定。优选地，在本发明的实施例中，沿所述盖板235的宽度方向，所述第一连接部2332的宽度为a(参见图8)，所述负极柱231的第二端的宽度为b(参见图9)，a与b之间满足关系式：a＞b，且85％≤b/a。通过将所述第一连接部2332的宽度尺寸限定为稍大于所述负极柱231的第二端的宽度尺寸，不仅可以节省所述负极转接片233的制作材料，降低成本，还可以给所述负极转接片233预留装配间隙，降低操作人员的装配操作精度，从而加快生产节拍提高生产效率，此外还可以保证所述负极转接片233与所述负极柱231之间具有适当大小的过流面积，避免所述负极转接片233与所述负极柱231之间的连接区域过窄导致内阻大电池发热，影响所述电池单体20的性能，同时避免所述负极转接片233与所述负极柱231之间的连接区域过大而影响所述电池单体20的能量密度。
可以理解的是，在将所述第一连接部2332与所述负极柱231的第二端进行焊接时，由于所述负极柱231的第二端被所述第一连接部2332遮挡而无法看到，并且为了给所述负极转接片233预留装配间隙，所述第一连接部2332的宽度a是稍大于所述负极柱231的第二端的宽度b，因而在焊接时也无法准确定位所述第一连接部2332与所述负极柱231的第二端可靠焊接的区域，会影响所述第一连接部2332与所述负极柱231的第二端之间的可靠焊接。
需要重点说明的是，如图8所示，在本发明的实施例中，为了实现所述第一连接部2332与所述负极柱231的第二端之间的可靠焊接，所述第一连接部2332的第一表面设有阵列排布的凹陷部2334，其中，沿所述盖板235的宽度方向，所述凹陷部2334的边缘与所述第一连接部2332对应的边缘之间的距离为c，c与a(即所述第一连接部2332的宽度)之间满足关系式：15％≤c/a≤20％。所述第一连接部2332的宽度a与所述负极柱231的第二端的宽度b之间满足85％≤b/a＜100％，即意味着所述第一连接部2332与所述负极柱231的第二端之间的对位容错区间小于等于15％，通过限定所述凹陷部2334的边缘与所述第一连接部2332对应的边缘之间的距离c与所述第一连接部2332的宽度a之间满足15％≤c/a≤20％，也就限定 所述第一连接部2332的第一表面未设有所述凹陷部2334的光面区域为所述第一表面的15％至20％，即所述凹陷部2334两侧的所述光面区域的最小宽度尺寸是大于等于所述负极柱231的第二端相对于所述第一连接部2332的最大容错空间，也即意味着，即使所述负极柱231的第二端与所述第一连接部2332对位在最大容错空间15％的情况下，只要在所述负极柱231的第二端不超出所述第一连接部2332区域的情况下，通过识别所述第一连接部2332上的所述凹陷部2334所在的区域进行焊接，便可确保实现所述第一连接部2332与所述负极柱231的第二端之间的可靠焊接。再者，所述第一连接部2332与所述负极柱231的第二端采用激光焊接时，设置于所述第一连接部2332的第一表面上的所述凹陷部2334，不仅可以增大所述第一表面的粗糙度，减弱所述第一表面对激光的反光作用，避免激光焊接的过程中因反光造成熔珠飞溅甚至爆燃的问题，还可以增加激光在所述第一表面上的斜反射次数，提高所述第一表面对激光的吸收率，有利于避免虚焊或者焊接不良的问题。另外，可以理解的是，激光焊接的焊接线一般是具有一定宽度的，即使焊接位置位于所述凹陷部2334的边缘处也是能保证所述第一连接部2332与所述负极柱231的第二端之间的连接可靠性。
其中，在本发明的实施例中，所述凹陷部2334可以但不限于是通过冲压形成的点阵压痕或者通过刻蚀形成的点阵凹坑，对此不作限定。
如图7至图10所示，在本发明的实施例中，沿所述盖板235的厚度方向，每一所述第二连接部2333具有相背的第三表面(即靠近并面向所述负极耳221的一面)和第四表面(即背离所述负极耳221的一面)，所述第三表面与所述第一表面共面，所述第四表面与所述第二表面共面，每一所述第二连接部2333的第三表面电连接对应的所述负极耳221(具体为电连接于所述第一片状主体2211)。其中，所述第二连接部2333可以通过激光焊接或者超声波焊接等方式电连接于对应的所述负极耳221。在图8至图10的示例中，所述第二连接部2333优选采用超声波焊接的方式电连接于对应的所述负极耳221，焊接牢固且安全性高。
优选地，如图7及图8所示，在本发明的实施例中，在所述负极转接片233中，至少一个所述第二连接部2333的靠近所述第一连接部2332的一端设有至少一个防呆缺角2335。通过设置所述防呆缺角2335，可以与用于放置多个所述负极转接片233的料架上的防呆结构(例如挡边)进行配合，从而使多个所述负极转接片233以朝向一致的正确姿态放置于所述料架上，防止任一所述负极转接片233放反，确保将所述负极转接片233拾取并安装在所述绝缘支架236上时，设有所述凹陷部2334的所述第一表面能背离所述负极柱231，保证所述第一连接部2332与所述负极柱231的第二端正确焊接，利于提高自动化加工的效率。
可选地，在一种可能的实施方式中，所述负极转接片233的其中一所述第二连接部2333的靠近所述第一连接部2332的一端可以设置两个所述防呆缺角2335，两个所述防呆缺角2335分别位于所在第二连接部2333的端部的不同侧边角处；在另一种可能的实施方式中，所述负极转接片233的每一所述第二连接部2333的靠近所述第一连接部2332的一端均可以设置一个所述防呆缺角2335，其中一个所述第二连接部2333上的所述防呆缺角2335位于所在第二连接部2333的端部的靠近所述第一连接部2332的一侧边角处，另一个所述第二连接部2333上的所述防呆缺角2335位于所在第二连接部2333的端部的远离所述第一连接部2332的一侧边角处；在又一种可能的实施方式中，所述负极转接片233的其中一所述第二连接部2333的靠近所述第一连接部2332的一端可以只设置一个所述防呆缺角2335，所述防呆缺角2335位于所在第二连接部2333的端部的任一侧边角处。前述几种实施方式中，所述负极转接片233上的所述防呆缺角2335均可以与所述料架上的防呆结构进行配合，防止所述负极转接片233放反。
具体地，在图7及图8的示例中，所述负极转接片233的其中一所述第二连接部2333的靠近所述第一连接部2332的一端设有所述防呆缺角2335，所述防呆缺角2335位于所在第二连接部2333的端部的靠近所述第一连接部2332的一侧边角处。本实施例中，只在所述负极转接片233的其中一个所述第二连接部2333上设置一个所述防呆缺角2335，加工简单；再者，请结合图9及图11，所述负极耳221的第一片状主体2211连接至对应的所述负极转接 片233的第二连接部2333时，所述第一片状主体2211的一端部位于所述第二连接部2333靠近所述转接片本体2331的位置，且自该位置向远离所述转接片本体2331的方向延伸并覆盖于所述第二连接部2333直至其边缘，将所述防呆缺角2335设置于所述第二连接部2333的端部的靠近所述第一连接部2332的一侧边角处可以避免干涉所述第一片状主体2211与所述第二连接部2333的连接，避免影响其导电连接的可靠性，有助于进一步提升所述电池单体20的循环性能。
在本发明的实施例中，所述负极转接片233优选采用一体结构，即所述负极转接片233的转接片本体2331、第一连接部2332以及第二连接部2333由同一金属片材(一般为铜)通过冲压、机械切割或者激光切割等工艺制备得到，制作工艺简单快捷。
需要说明的是，在本发明的实施例中，所述正极转接片234也包括转接片本体、第一连接部以及至少一个第二连接部，其结构与所述负极转接片233的结构基本相同，对此不作赘述。同理，所述正极转接片234也可以在第一连接部的背离所述正极柱232的一侧表面设置所述凹陷部2334，且在至少一个第二连接部的靠近所述第一连接部的一端设置至少一个防呆缺角2335，可以起到上述相同的效果，对此也不作赘述。
进一步地，请一并参阅图6及图10，在本发明的实施例中，所述电池单体20还包括多个保护片24，所述负极转接片233的每一所述第二连接部2333对应设置有一所述保护片24，与所述第二连接部2333连接的所述负极耳221连接于所述保护片24和所述第二连接部2333之间。
具体的，如图6及图10所示，所述负极耳221的第一片状主体2211位于所述保护片24和所述第二连接部2333之间。通过在所述负极耳221的第一片状主体2211和对应的所述第二连接部2333之间设置一所述保护片24，可避免所述第一片状主体2211在与所述第二连接部2333进行焊接时被焊穿，有利于保证所述第二连接部2333与所述负极耳221之间的可靠焊接。
其中，优选地，在本发明的实施例中，所述保护片24采用双层结构，如此，不仅可以提升自身的整体结构强度，避免所述保护片24在运输或者安装过程中被折弯，又可以保证与所述负极耳221的第一片状主体2211以及所述负极转接片233的贴合程度，确保三者之间的焊接可靠性。
具体的，请结合图11及图12，在本发明的其中一实施例中，所述保护片24由金属薄片制成，所述金属薄片包括第一保护子片241以及连接于所述第一保护子片241在宽度方向的相对两侧的两个第二保护子片242，所述两个第二保护子片242相对所述第一保护子片241翻折呈夹角设置并设于所述第一保护子片241在厚度方向的同一侧，且所述两个第二保护子片242之间沿所述盖板235的宽度方向留有间隙，从而构成所述双层结构。本实施例中，所述两个第二保护子片242与所述第一保护子片241为一体结构，无需设置其他连接结构，从而降低所述保护片24的制造成本；再者，所述两个第二保护子片242只需要通过弯折和冲压的工艺即可与所述第一保护子片241层叠构成双层结构，加工方便，而且所述两个第二保护子片242相对所述第一保护子片241翻折后，所述两个第二保护子片242相背的一侧边缘形成弧角，可以避免在压伏所述负极耳221时划伤所述负极耳221。需要说明的是，在本发明的实施例中，为了便于操作，所述两个第二保护子片242相对所述第一保护子片241翻折后层叠于所述第一保护子片241上，也就是说所述第二保护子片242与所述第一保护子片241之间的夹角为零。
其中，可选地，所述保护片24焊接于所述第一片状主体2211背离所述第二连接部2333的一侧时，可以是所述第一保护子片241贴接于所述第一片状主体2211，也可以是所述两个第二保护子片242贴接于所述第一片状主体2211。具体的，在图10的示例中，所述第一保护子片241贴接于所述第一片状主体2211，而所述两个第二保护子片242层叠于所述第一保护子片241的背离所述第一片状主体2211的一侧。优选地，如图11所示，在本发明的实施例中，每一所述第二保护子片242在长度方向的至少一端靠近另一所述第二保护子片242的 边角开设内缩缺口243，且所述两个第二保护子片242在长度方向的同一端的两个所述内缩缺口243连通形成收容空间。通过在每一所述第二保护子片242在长度方向的至少一端的边角处形成所述内缩缺口243，可以避免呈直角的边角在突出或者翘起时划伤所述负极耳221的风险。进一步优选地，如图11所示，在本发明的实施例中，所述第一保护子片241在长度方向的至少一端凸设有止挡部244，所述止挡部244部分收容于两个所述内缩缺口243连通形成的收容空间内。不难理解，通过在两个所述内缩缺口243连通形成成的收容空间内设置所述止挡部244，在所述两个第二保护子片242的端部与所述负极耳221接触时，所述止挡部244会优先与所述负极耳221进行接触，从而为所述第二保护子片242的边角处支撑出一定的距离，有利于进一步防止所述第二保护子片242的边角划伤所述负极耳221。在图11的示例中，每一所述第二保护子片242在长度方向的每一端靠近另一所述第二保护子片242的边角均开设内缩缺口243，且所述第一保护子片241在长度方向的每一端均凸设有所述止挡部244。
可选地，所述止挡部244可以是连接于所述第一保护子片241的端部的一个延伸片，所述延伸片相对所述第一保护子片241翻折90度后构成所述止挡部244，所述止挡部244也可以是直接凸设于所述第一保护子片241的端部面向所述两个第二保护子片242的一侧的凸起结构。其中，所述延伸片及所述凸起结构优选设置倒圆角，以避免划伤所述负极耳221。
可以理解的是，在本发明的实施例中，所述正极转接片234的每一个所述第二连接部也可以对应设置一个所述保护片24，从而可以确保所述正极转接片234的第二连接部与所述正极耳222之间的有效焊接，对此不作赘述。
其中，需要说明的是，在本发明的实施例中，所述保护片24的材质可以是铜、铝等金属，优选与其对应的所述转接片的材质相同，即所述保护片24与所述负极转接片233的第二连接部2333对应时，所述保护片24与所述负极转接片233的材质相同(一般为铜)；所述保护片24与所述正极转接片234的第二连接部对应时，所述保护片24与所述正极转接片234的材质相同(一般为铝)。
请结合图6、图7、图13及图14，在本发明的实施例中，所述端盖组件23还包括防爆阀237、防爆阀保护片238、应激件239等其他部件，下面将结合附图对所述端盖组件23的结构作进一步的详细描述。
如图6、图13及图14所示，在本发明的其中一实施例中，所述盖板235为长方形的板体，且沿厚度方向开设有贯穿其相对两侧的两个第一装配孔2351、一个泄压孔2352、一个注液孔2353以及一个安装孔2354。所述两个第一装配孔2351位于所述盖板235在长度方向的相对两端，以分别用于供所述负极柱231和所述正极柱232穿过。所述泄压孔2352位于所述盖板235的中部，所述泄压孔2352的相对两侧孔口处分别设置有所述防爆阀237和所述防爆阀保护片238。具体的，如图6所示，所述防爆阀237设置于所述盖板235的面向所述电极组件22的一侧，并且覆盖所述泄压孔2352的靠近所述电极组件22的一侧孔口，所述防爆阀237用于在所述电池单体20热失控时发生效用爆破，以避免所述电池单体20爆炸；所述防爆阀保护片238设置于所述盖板235的背离所述电极组件22的一侧，并且覆盖所述泄压孔2352的远离所述电极组件22的一侧孔口，所述防爆阀保护片238用于防止灰尘等粘附于所述防爆阀237上以保证所述防爆阀237能够正常发生爆破。所述防爆阀237和所述防爆阀保护片238可以采用现有的防爆阀和防爆阀保护片，其功能和作用原理，在此不作赘述。
所述绝缘支架236为大致呈长方形板状的支架，所述绝缘支架236在长度方向的相对两端分别开设有第二装配孔2361，两个所述第二装配孔2361贯穿所述绝缘支架236在厚度方向的相对两侧并分别与所述盖板235上的两个第一装配孔2351对应连通，连通的所述第二装配孔2361及所述第一装配孔2351用于穿装对应的一所述极柱。所述绝缘支架236在对应所述泄压孔2352的部位开设有第一镂空结构2362，所述第一镂空结构2362用于供所述电池单体20热失控时产生的气体通过并聚集在所述防爆阀237的下方，当聚集气体的压力值达到所述防爆阀237的压敏阈值时，所述防爆阀237即可发生效用爆破。所述绝缘支架236在对应 所述注液孔2353的部位开设有通孔(图中未标号)，以供电解液通过连通的所述注液孔2353及所述通孔注入所述壳体21内，从而浸润所述电极组件22。所述绝缘支架236在对应所述安装孔2354的部位开设有第二镂空结构2363，所述第二镂空结构2363具有多个镂空孔部2363a，且至少一个所述镂空孔部2363a沿所述盖板235的厚度方向贯穿所述绝缘支架236，所述应激件239的至少部分能够通过所述第二镂空结构2363上的至少一个所述镂空孔部2363a被视觉系统检测到(后文会有更进一步的描述)。其中，所述第一镂空结构2362包括镂空槽和/或镂空孔，只要能够允许气体通过即可，对此不作限定；所述第二镂空结构2363上的镂空孔部2363a也可以包括镂空槽和/或镂空孔，只要能够透过至少一个所述镂空孔部2363a看到所述应激件239即可，对此也不作限定。在图13及图14的示例中，所述第一镂空结构2362包括多个圆形镂空孔，所述第二镂空结构2363的每一所述镂空孔部2363a为沿所述盖板235的长度方向延伸的方形镂空孔，相邻的所述方形镂空孔之间具有连接筋条。
优选地，如图6及图14所示，在本发明的其中一实施例中，所述绝缘支架236用于开设所述第二装配孔2361及所述第二镂空结构2363的部位朝向所述盖板235的一侧为凸起结构，所述盖板235的面向所述绝缘支架236的一侧分别设有第一沉槽2355和第二沉槽2356，其中一所述第一装配孔2351及其相邻的所述安装孔2354位于所述第一沉槽2355中，另一所述第一装配孔2351位于所述第二沉槽2356中，当所述绝缘支架236安装于所述盖板235的一侧时，其中一所述第二装配孔2361及其相邻的所述第二镂空结构2363所在部位对应的凸起结构收容于所述第一沉槽2355中，另一所述第二装配孔2361所在部位对应的凸起结构则收容于所述第二沉槽2356中，所述第二装配孔2361与所述第一装配孔2351一一对应连通，所述第二镂空结构2363对应所述安装孔2354。本实施例中，通过在所述盖板235面向所述绝缘支架236的一侧分别开设所述第一沉槽2355和所述第二沉槽2356，以用于收容所述绝缘支架236上的所述凸起结构，可以起到定位作用，便于快速将所述绝缘支架236安装于所述盖板235的一侧，并且防止所述绝缘支架236相对所述盖板235移动。
请结合图6及图9，在本发明的其中一实施例中，每一所述极柱均包括柱体部以及法兰部，其中，所述柱体部即为所述极柱的第一端，所述法兰部即为所述极柱的第二端。具体的，以所述负极柱231为例，如图9所示，所述负极柱231包括柱体部2311以及连接于所述柱体部2311的一端的法兰部2312；参见图6，当所述负极柱231穿装于所述盖板235及所述绝缘支架236中时，所述柱体部2311穿装于其中一所述第一装配孔2351及其连通的所述第二装配孔2361中，所述法兰部2312外露于所述绝缘支架236的背离所述盖板235的一侧以用于焊接所述负极转接片233的第一连接部2332(见图9)。类似的，当所述正极柱232穿装于所述盖板235及所述绝缘支架236中时，所述正极柱232的柱体部穿装于另一所述第一装配孔2351及其对应连通所述第二装配孔2361中，所述正极柱232的法兰部外露于所述绝缘支架236的背离所述盖板235的一侧以用于焊接所述正极转接片234的第一连接部。
优选地，如图6及图14所示，在本发明的其中一实施例中，所述绝缘支架236的背离所述盖板235的一侧开设有两个安装槽，每一所述极柱的第二端适配并安装于对应的一个所述安装槽内。具体的，所述绝缘支架236用于开设所述第二装配孔2361的部位背离所述盖板235的一侧分别开设有第三沉槽2364以及第四沉槽2365，所述第三沉槽2364用于收容所述负极柱231的法兰部2312，所述第四沉槽2365用于收容所述正极柱232的法兰部。本实施例中，通过在所述绝缘支架236背离所述盖板235的一侧分别开设所述第三沉槽2364和所述第四沉槽2365，以分别收容所述负极柱231和所述正极柱232的法兰部，可以起到定位作用，便于快速将极柱穿装于所述盖板235及所述绝缘支架236上，同时也可以防止所述极柱发生移动。
需要说明的是，在本发明的实施例中，所述负极柱231和所述正极柱232的柱体部远离其法兰部的一端端部均穿出所述盖板235背离所述绝缘支架236的一侧，以分别与对应的导电压块进行电连接。具体的，请结合图6及图9，在本发明的其中一实施例中，所述负极柱231的柱体部2311远离法兰部2312的一端端部穿出所述盖板235，并且焊接于一个负极导电 压块2314的接合面(即所述负极导电压块2314的背离所述盖板235的表面)；类似的，所述正极柱232的柱体部远离法兰部的一端端部穿出所述盖板235，并且焊接于一个正极导电压块2324的接合面。本实施例中，所述负极柱231和所述正极柱232各自穿出所述盖板235的一端(即柱体部)焊接于对应的一个导电压块，而所述负极柱231和所述正极柱232各自的另一端(即法兰部)收容于所述绝缘支架236上的沉槽内，可以将所述负极柱231和所述正极柱232的相对两端进行固定，并且所述负极柱231和所述正极柱232焊接导电压块后具有较大的连接面积，更方便于作为接电端子。其中，所述负极导电压块2314和所述正极导电压块2324分别开设有用于穿装对应极柱的端部的通孔，以增加对应的极柱与导电压块之间的连接面积，有助于提高电连接可靠性。
如图13所示，在本发明的其中一实施例中，所述负极柱231和所述负极导电压块2314之间设置有负极分隔件2315，所述正极柱232和所述正极导电压块2324之间设置有正极分隔件2325。具体的，在图13的示例中，所述正极分隔件2325为设于所述盖板235的背离所述绝缘支架236的一侧的塑胶垫片，所述塑胶垫片夹设于所述正极导电压块2324与所述盖板235之间；所述负极分隔件2315为设于所述盖板235的背离所述绝缘支架236的一侧的塑胶套，所述塑胶套的背离所述盖板235的一侧且于远离所述安装孔2354的一端开设有开口，所述负极导电压块2314自所述开口处套装于所述塑胶套内，且所述负极导电压块2314与所述负极柱231焊接的部分通过所述开口外露。其中，所述负极分隔件2315和所述正极分隔件2325面向所述盖板235的一侧还分别开设有供对应极柱的端部穿过的通孔。
如图13所示，在本发明的实施例中，所述负极导电压块2314具体包括用于焊接所述负极柱231端部的压块主体(未标号)以及位于所述压块主体的靠近所述安装孔2354的一侧的延伸体(未标号)，所述负极分隔件2315面向所述盖板235的一侧还开设有连通所述安装孔2354的通孔，所述延伸体与安装于所述安装孔2354内的应激件239正对(参见图6)。需要说明的是，在本发明的实施例中，所述应激件239与所述盖板235电连接，且所述盖板235与所述正极导电压块2324电连接，当所述电池单体20热失控的内部压力超过所述应激件239的基准压力时，所述应激件239在气压作用下会发生翻转并与所述负极导电压块2314的延伸体电接触，所述负极柱231与所述正极柱232通过所述盖板235导通，使得所述电极组件22中的正负极耳发生外短路，由此可以降低所述电池单体20爆炸和着火的风险，提高了所述电池单体20的安全性。
可以理解的是，在其他实施例中，所述盖板235也可以将所述安装孔2354开设于邻近所述正极柱232的部位，所述正极导电压块2324对应设置有所述延伸体，且将所述负极导电压块2314电连接于所述盖板235，如此，所述应激件239在气压作用下会发生翻转并与所述正极导电压块2324的延伸体电接触，同样可以实现上述相同的效果。
其中，所述应激件239的具体结构及工作原理与现有应激件的结构及工作原理相同，对此不作赘述。
进一步地，请一并参阅图7、图8、图13以及图14，在本发明的其中一实施例中，所述负极转接片233和所述正极转接片234分别设置于所述绝缘支架236背离所述盖板235的一侧沿所述盖板235方向上的相对两端，且每一所述转接片的第一连接部位于所述转接片的转接片本体远离所述盖板235中部的一侧，从而用于和对应的极柱外露的部分(即法兰部)进行激光焊接。其中，如图7及图8所示，本实施例中，所述负极转接片233的转接片本体2331开设有通孔2336，沿所述盖板235的厚度方向，自所述通孔2336朝向所述盖板235看，所述通孔2336与其中一所述镂空孔部2363a对应连通，使得至少部分所述应激件239可视化显示于连通的所述镂空孔部2363a和所述通孔2336中。通过在所述负极转接片233的转接片本体2331开设用于连通所述第二镂空结构2363的通孔2336，以使所述应激件239部分外露，如此，在所述电池单体20的制作过程中，利用机器视觉系统透过连通的所述通孔2336及所述第二镂空结构2363的镂空孔部2363a来检测是否有所述应激件239的反光，即可确定所述负极转接片233是否正确安装于绝缘支架236上，有利于提高自动化生产的生产效率。
可以理解的是，所述通孔2336过小会增加所述机器视觉系统的探头对准所述通孔2336的精度要求，而所述通孔2336过大则不仅会降低所述转接片本体2331的结构强度，还会增大所述负极转接片233对位的容错空间，例如所述负极转接片233可能倾斜并没有对位安装时，但由于所述通孔2336过大导致仍可以检测到所述应激件239的反光而误认为所述负极转接片233对位安装，因此，所述通孔2336的大小要合理设计。优选地，在图8的示例中，所述通孔2336的直径优选为3.5mm-4.5mm，通过将所述通孔2336的直径大小控制在该合理范围内，可避免所述通孔2336过小或者过大带来的前述问题。
进一步优选地，请再次参阅图14，在本发明的其中一实施例中，沿所述盖板235的厚度方向，自所述通孔2336朝向所述盖板235看，所镂空孔部2363a在所述盖板235上的正投影的远离所述负极柱231的侧边的尺寸(即所述镂空孔部2363a沿所述盖板235的宽度方向的宽度)小于或者等于所述通孔2336的直径。通过限定所述镂空孔部2363a的宽度小于或者等于所述通孔2336的直径，可以确保所述应激件239透过所述镂空孔部2363a的反光可以透过与所述镂空孔部2363a连通的所述通孔2336，进而被检测到，从而确定所述负极转接片233是否正确安装于绝缘支架236上。
需要说明的是，在其他的实施例中，所述应激件239可以设置于所述盖板235的邻近所述正极柱232的部位，即所述盖板235可以在邻近所述正极柱232的部位开设用于安装所述应激件239的安装孔2354，且所述绝缘支架236在邻近所述正极柱232的部位对应设置所述第二镂空结构2363，相应的，所述正极转接片234的转接片本体上可以开设连通所述第二镂空结构2363的镂空孔部2363a的通孔，以使所述应激件239部分外露，利用机器视觉系统来检测是否有所述应激件239的反光，即可确定所述正极转接片234是否正确安装于绝缘支架236上，同样有利于提高自动化生产的生产效率，对此不作赘述。
进一步的，请再次参阅图7，在本发明的其中一实施例中，所述绝缘支架236由第一子绝缘支架2368和第二子绝缘支架2369组成，所述负极转接片233和所述正极转接片234分别安装于所述第一子绝缘支架2368和所述第二子绝缘支架2369上。在本实施例中，所述绝缘支架236由两个绝缘支架构成，可以简化单一支架的结构，便于加工。当然，在其他的实施例中，所述绝缘支架236也可以是一体结构。
如图7所示，在本发明的其中一实施例中，沿所述盖板235的长度方向，所述第一子绝缘支架2368的背离所述盖板235的一侧的第一端(图7所示右端)形成第一凸台2368a，所述第一凸台2368a靠近所述第一连接部2332的侧壁开设有让位槽2366，所述第一连接部2332的第一端连接于所述转接片本体2331的远离所述盖板235的中部的一侧，所述第一连接部2332的远离所述转接片本体2331的第二端收容于所述让位槽2366内。在本实施例中，通过在所述第一子绝缘支架2368的第一凸台2368a的侧壁上开设所述让位槽2366，并将所述第一连接部2332的第二端收容于所述让位槽2366内，可以对所述负极转接片233的安装起到引导和定位作用，便于快速安装所述负极转接片233，提高所述电池单体20的组装效率。
优选地，请一并参阅图7、图9及图15，在本发明的其中一实施例中，沿所述盖板235的宽度方向，所述负极柱231的第二端(即法兰部2312)的安装槽(即所述第三沉槽2364)的槽壁与所述让位槽2366对应的槽壁之间的距离为H1(参见图15)，其中，15％≤H1/b≤20％。本实施例中，通过限定所述第三沉槽2364的槽壁与所述让位槽2366对应的槽壁之间的距离H1与所述负极柱231的第二端的宽度b(参见图9)之间的比值，也即相当于限定了所述负极柱231相对于所述让位槽2366的对位容错区间为所述第一连接部2332的宽度a的15％至20％，而所述凹陷部2334的边缘与所述第一连接部2332对应的边缘之间的距离c也为所述第一连接部2332的宽度a的15％至20％，因此，不论所述负极转接片233在所述让位槽2366中如何移动，都可以保证所述凹陷部2334与所述负极柱231的第二端对位，从而确保所述负极转接片233的第一连接部2332与所述负极柱231的第二端之间的可靠焊接。
进一步优选地，如图7至图9及图15所示，在本发明的其中一实施例中，沿所述盖板235的长度方向，所述让位槽2366的槽壁与所述第三沉槽2364对应的槽壁之间的距离为d1 (参见图15)，所述负极柱231的法兰部2312的长度为d2(参见图9)，所述凹陷部2334的长度为d3(参见图8)，所述第一连接部2332的边缘与所述凹陷部2334对应的边缘之间的距离为d4(参见图8)，其中，15％≤d1/d2≤20％，80％≤d3/d2≤85％，15％≤d4/d2≤20％。本实施例中，通过分别限定d1、d3、d4与d2之间的比值，可以保证即使所述负极转接片233沿所述盖板235的长度方向移动延伸容置于所述让位槽2366中，所述负极转接片233在最大延伸区域下也是只有未设置所述凹陷部2334的光滑区域延伸至所述让位槽2366中，所述凹陷部2334仍然能够对准所述负极柱231的法兰部2312，从而保证对准所述凹陷部2334即可实现负极转接片233的第一连接部2332与所述负极柱231的第二端之间的可靠焊接。
请再次参阅图7，在本发明的其中一实施中，所述第一子绝缘支架2368上的背离所述盖板235的一侧的第二端形成有第二凸台2368b，所述第二凸台2368b的靠近所述第一连接部2332的一侧设置有多条凸筋2367，所述多条凸筋2367沿所述盖板235的宽度方向间隔设置，所述转接片本体2331的远离所述第一连接部2332的一侧设有让位缺口2337，所述多条凸筋2367至少部分收容于所述让位缺口2337内。本实施例中，通过开设所述让位缺口2337以收容所述多条凸筋2367，也可以在将所述负极转接片233安装在所述绝缘支架236上时起到引导和定位的作用，由此，所述负极转接片233沿所述盖板235的长度方向上的两端分别由所述让位槽2366以及所述凸筋2367进行限位，方便于快速安装所述负极转接片233，进一步提高所述电池单体20的组装效率。其中，需要说明的是，所述多条凸筋2367用保证所述绝缘支架236邻近所述第一镂空结构2362的区域的表面平面度，对此不作赘述。
可以理解的是，所述绝缘支架236的第二子绝缘支架2369在所述盖板235的长度方向上靠近所述正极转接片234的第一连接部的侧壁也可以开设有让位槽，所述正极转接片234的第一连接部的端部对应收容于所述让位槽内，同样可以起到定位引导的作用，便于所述正极转接片234的安装。同理，所述正极转接片234的转接片本体远离第一连接部的一侧也可以设置让位缺口，所述第二子绝缘支架2369上对应设置凸筋或者限位柱，以通过所述让位缺口与所述凸筋或者限位柱的配合，实现对所述正极转接片234的定位引导作用，对此不作赘述。
需要说明的是，与现有电池单体的端盖组件类似，所述端盖组件23还包括其他的一些部件，例如图13及图14所示的密封胶钉、密封铝钉以及盖板贴片230，所述密封胶钉用于插接于所述绝缘支架236上的连通所述注液孔2353的通孔内，以实现所述电池单体20的工序制程中的短暂密封，所述密封铝钉用于在电解液完成注液后焊接密封所述注液孔2353，所述盖板贴片230用于使所述盖板235与所述储能装置1的箱体组件10进行绝缘，当然，所述端盖组件23还包括用于包覆所述壳体21的外壁面的绝缘膜等未示出的部件，对此不作赘述。
进一步地，本发明实施例还提供一种用电设备，其包括用电设备本体以及本发明实施例提供的所述储能装置1，所述储能装置1用于为所述用电设备本体进行供电。由于所述储能装置1包括上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。
其中，所述用电设备可以为但不限于为手机、平板电脑、笔记本电脑、台式电脑、智能手环、智能手表、电子阅读器、游戏机、玩具等电子设备以及前述的户用储能系统，对此不作限定。
在本发明的描述中，参考术语“实施例”、“具体实施例”、“示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本发明的实施例，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。

Claims (16)

  1. 一种端盖组件，包括盖板、设于所述盖板在厚度方向的其中一侧的绝缘支架、以及沿所述厚度方向穿装于所述盖板和所述绝缘支架中的极柱，所述极柱的第一端位于所述盖板的背离所述绝缘支架的一侧，所述极柱的第二端位于所述绝缘支架的背离所述盖板的一侧，其中，所述端盖组件还包括转接片，所述转接片包括：
    转接片本体，设于所述绝缘支架的背离所述盖板的一侧；
    第一连接部，连接于所述转接片本体在所述盖板的长度方向的其中一侧，所述第一连接部连接所述极柱的第二端；沿所述厚度方向，所述第一连接部具有相背的第一表面和第二表面，所述第一表面背离所述极柱，所述第二表面靠近所述极柱，所述第一表面设有阵列排布的凹陷部；
    沿所述盖板的宽度方向，所述第一连接部的宽度为a，所述极柱的第二端的宽度为b，所述凹陷部的边缘与所述第一连接部对应的边缘之间的距离为c，其中，a＞b，85％≤b/a，15％≤c/a≤20％。
  2. 如权利要求1所述的端盖组件，其中，所述转接片还包括两个二连接部，所述两个第二连接部分别连接于所述转接片本体在所述盖板的宽度方向的相对两侧，其中一所述第二连接部的靠近所述第一连接部的一端设有防呆缺角，所述防呆缺角位于所在第二连接部的端部的靠近所述第一连接部的一侧边角处。
  3. 如权利要求1或2所述的端盖组件，其中，所述盖板开设有安装孔，所述安装孔沿所述厚度方向贯穿所述盖板，所述绝缘支架在对应所述安装孔的部位开设有镂空结构，所述镂空结构上的至少一个镂空孔部沿所述厚度方向贯穿所述绝缘支架，所述端盖组件还包括设于所述安装孔内的应激件；
    所述转接片本体开设有通孔，沿所述盖板的厚度方向，自所述通孔朝向所述盖板看，所述通孔与其中一所述镂空孔部对应连通，至少部分所述应激件可视化显示于连通的所述镂空孔部和所述通孔中。
  4. 如权利要求3所述的端盖组件，其中，所述通孔的直径为3.5mm-4.5mm。
  5. 如权利要求3或4所述的端盖组件，其中，沿所述盖板的厚度方向，自所述通孔朝向所述盖板看，所述镂空孔部在所述盖板上的正投影的远离所述极柱的侧边的尺寸小于或者等于所述通孔的直径。
  6. 如权利要求1至5任一项所述的端盖组件，其中，沿所述盖板的长度方向，所述第一连接部的第一端连接于所述转接片本体的远离所述盖板的中部的一侧，所述绝缘支架包括用于设置所述转接片的第一子绝缘支架，所述第一子绝缘支架上的背离所述盖板的一侧的第一端形成第一凸台，所述第一凸台靠近所述第一连接部的侧壁开设有让位槽，所述第一连接部的远离所述转接片本体的第二端收容于所述让位槽内。
  7. 如权利要求6所述的端盖组件，其中，所述绝缘支架的背离所述盖板的一侧开设有安装槽，所述极柱的第二端适配并安装于所述安装槽内；
    沿所述盖板的宽度方向，所述安装槽的槽壁与所述让位槽对应的槽壁之间的距离为H1，其中，15％≤H1/b≤20％。
  8. 如权利要求6或7所述的端盖组件，其中，所述绝缘支架的背离所述盖板的一侧开设有安装槽，所述极柱的第二端适配并安装于所述安装槽内；
    沿所述盖板的长度方向，所述让位槽的槽壁与所述安装槽对应的槽壁之间的距离为d1，所述极柱的第二端的长度为d2，所述凹陷部的长度为d3，所述第一连接部的边缘与所述凹陷部对应的边缘之间的距离为d4，其中，15％≤d1/d2≤20％，80％≤d3/d2≤85％，15％≤d4/d2≤20％。
  9. 如权利要求1至8任一项所述的端盖组件，其中，沿所述盖板的长度方向，所述第一连接部的第一端连接于所述转接片本体的远离所述盖板的中部的一侧，所述绝缘支架包括用 于设置所述转接片的第一子绝缘支架，所述第一子绝缘支架上的背离所述盖板的一侧的第二端形成第二凸台，所述第二凸台的靠近所述第一连接部的一侧设置有多条凸筋，所述多条凸筋沿所述盖板的宽度方向间隔设置，所述转接片本体的远离所述第一连接部的一侧设有让位缺口，所述多条凸筋至少部分收容于所述让位缺口内。
  10. 一种储能装置，其中，包括至少一个电池单体，所述电池单体包括壳体、电极组件以及如权利要求1至9任一项所述的端盖组件；
    其中，所述壳体具有开口和容纳腔，所述电极组件包括极耳，所述转接片包括与所述极耳对应连接的第二连接部，所述电极组件收容于所述容纳腔内，所述端盖组件封装于所述开口处。
  11. 如权利要求10所述的储能装置，其中，所述电池单体还包括多个保护片，所述转接片的每一所述第二连接部对应设置一所述保护片，所述极耳连接于所述保护片和所述第二连接部之间。
  12. 如权利要求11所述的储能装置，其中，所述保护片由金属薄片制成，且所述保护片采用双层结构。
  13. 如权利要求12所述的储能装置，其中，所述金属薄片包括第一保护子片以及连接于所述第一保护子片在宽度方向的相对两侧的两个第二保护子片，所述两个第二保护子片相对所述第一保护子片翻折呈夹角设置并设于所述第一保护子片在厚度方向的同一侧，且所述两个第二保护子片之间沿所述盖板的宽度方向留有间隙。
  14. 如权利要求13所述的储能装置，其中，所述第一保护子片贴接于所述极耳的背离所述第二连接部的一侧，所述两个第二保护子片层叠于所述第一保护子片的背离所述极耳的一侧；
    每一所述第二保护子片在长度方向的至少一端靠近另一所述第二保护子片的边角开设内缩缺口，且所述两个第二保护子片在长度方向的同一端的两个所述内缩缺口形成收容空间。
  15. 如权利要求14所述的储能装置，其中，所述第一保护子片在长度方向的至少一端凸设有止挡部，所述止挡部部分收容于两个所述内缩缺口形成的所述收容空间内。
  16. 一种用电设备，其中，包括如权利要求10至15任一项所述的储能装置。
PCT/CN2023/097622 2023-05-31 2023-05-31 端盖组件、储能装置以及用电设备 Ceased WO2024243909A1 (zh)

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