WO2023051784A1 - 储能装置及用电设备 - Google Patents

储能装置及用电设备 Download PDF

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Publication number
WO2023051784A1
WO2023051784A1 PCT/CN2022/123248 CN2022123248W WO2023051784A1 WO 2023051784 A1 WO2023051784 A1 WO 2023051784A1 CN 2022123248 W CN2022123248 W CN 2022123248W WO 2023051784 A1 WO2023051784 A1 WO 2023051784A1
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WO
WIPO (PCT)
Prior art keywords
hot
melt connection
melt
insulating sheet
energy storage
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PCT/CN2022/123248
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English (en)
French (fr)
Inventor
徐卫东
易梓琦
吴祖钰
张男
唐阳
Original Assignee
厦门海辰储能科技股份有限公司
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Publication of WO2023051784A1 publication Critical patent/WO2023051784A1/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/147Lids or covers
    • H01M50/166Lids or covers characterised by the methods of assembling casings with lids
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling

Definitions

  • the present application relates to the field of new energy technologies, and in particular to an energy storage device and electrical equipment.
  • Most energy storage devices in the related art include a casing (mostly an aluminum casing) and a bare cell.
  • the bare cell is usually installed in an accommodating chamber of the casing to protect the bare cell.
  • these situations are likely to cause the bare cell to collide with the casing.
  • It may lead to a short circuit in the contact between the bare cell and the shell, and on the other hand may cause damage to the structure of the bare cell. Regardless of the above aspects, it will affect the stability of the electrical performance of the energy storage device, and may cause the battery to be unusable in severe cases.
  • the embodiment of the present application discloses an energy storage device and an electric device, which can realize the protection of the bare cell, thereby improving the stability of the electric performance of the battery.
  • the first aspect of the present application discloses an energy storage device, the energy storage device includes
  • the casing has an opening and an accommodating chamber located in the casing and communicating with the opening;
  • the top cover assembly includes a top cover body and an insulating member, the top cover body seals the opening, and the insulating member is arranged on a side of the top cover body facing the accommodating cavity;
  • a cell assembly the cell assembly includes at least one bare cell and an insulating sheet covering the outside of the bare cell, the bare cell is located in the accommodating cavity, and the insulating sheet is adjacent to the top
  • One end of the cover assembly is heat-fused connected to the insulating member.
  • the bare cell and the shell can be separated by the insulating sheet to prevent the bare cell from colliding with the shell during the installation of the bare cell or during long-term use.
  • Contact with the case affects the stability of the electrical properties of the energy storage device.
  • one end of the insulating sheet adjacent to the top cover assembly is thermally connected to the insulating member, so that the bare electric core is separated from the casing and the top cover body.
  • the reliability of the insulating sheet covering the outside of the bare cell can be enhanced, and the possibility of contact between the bare cell and the shell and the top cover body can be avoided from the root, and short circuit can occur in the contact between the bare cell and the shell or the top cover body.
  • it can also prevent the insulating sheet from being unable to cover the outside of the bare cell due to long-term use, which is conducive to achieving comprehensive protection for the bare cell.
  • the top cover body has a first surface facing the accommodating cavity, the insulator is disposed on the first surface, and the insulator has a second surface facing away from the first surface. Two surfaces and a peripheral surface connected to the edge of the second surface, the peripheral surface extends toward the top cover body in a direction perpendicular to the first surface, and the insulating sheet is adjacent to the top cover assembly One end of the thermal fusion connection is connected to the peripheral surface of the insulating member.
  • this application makes One side of the insulating sheet adjacent to the top cover assembly is hot-melt connected to the peripheral surface connected to the second surface of the insulating member.
  • the insulating sheet will not occupy the surface space of the second surface, and on the other hand, the area of the peripheral surface is relatively large. Therefore, the thermal fusion area of the insulating sheet on the insulating member can be increased, thereby improving the thermal fusion reliability of the insulating sheet and the insulating member.
  • the edge of the first surface surrounds the edge of the second surface, and the edge of the first surface and the second surface A gap is formed between the edges of the two surfaces, and one end of the insulating sheet adjacent to the top cover assembly is located in the gap, and the gap is 1mm-1.5mm.
  • the insulating sheet can be more wrapped around the outside of the insulating member and the electric core.
  • the insulating member includes at least one hot-melt connection part, the hot-melt connection part is arranged along at least a part of the edge of the second surface, and the insulating sheet is adjacent to the top.
  • One end of the cover component is hot-melt connected to the part of the peripheral surface located at the hot-melt connection part.
  • the insulating sheet when the insulating sheet is connected to the insulating member, it can not occupy the space on the second surface, and avoid affecting the arrangement of other devices on the insulating member.
  • the sheet has sufficient hot-melt area.
  • the distance from the side of the hot-melt connection portion away from the second surface to the first surface is 2mm-3mm. That is, along the direction of the bare cell pointing to the top cover body, the overall thickness of the hot melt connection part is 2mm-3mm, so that the hot melt connection part has sufficient thickness and can ensure enough hot melt area to be thermally connected with the insulating sheet. Fusion connection, improve the thermal fusion reliability of the insulation sheet and the thermal fusion connection.
  • the insulating member is in the shape of a strip, and the insulating member includes a plurality of heat-melt connection portions arranged at intervals along the length direction of the insulating member.
  • the insulator includes a plurality of hot-melt connection parts along the length direction of the insulator, so that the hot-melt position with the insulating sheet can be increased, thereby increasing the hot-melt area with the insulating sheet, and improving the reliability of hot-melt between the two.
  • the plurality of hot-melt connection parts at least include a first hot-melt connection part and a second hot-melt connection part, and the first hot-melt connection part and the second hot-melt connection part Located at both ends of the insulating member in the length direction, the second surface has a buffer portion, and the buffer portion is located between the first heat-melt connection portion and the second heat-melt connection portion.
  • the first hot-melt connection part and the second hot-melt connection part are respectively located at both ends of the length direction of the insulator.
  • the hot-melt area can be increased, and on the other hand, the insulating sheet can be thermally fused to the hot-melt connection part.
  • the hot-melt joints at both ends of the insulating piece in the length direction keep the heat-melting force on the insulating sheet as consistent as possible, so as to avoid pulling the insulating sheet due to uneven force on both ends, which may cause the insulating sheet to be damaged after long-term use. Easy to fall off.
  • the buffer part is formed between the first hot-melt connection part, the second hot-melt connection part and the second surface,
  • the buffer can be used to achieve buffering between the cell and the insulator, so as to avoid direct contact between the cell and the insulator, and avoid battery damage during assembly or long-term use. In the event of a collision, impact, etc., the battery cell may hit the insulator and cause damage to the battery cell.
  • the battery further includes a first adapter piece and a second adapter piece, and the first adapter piece and the second adapter piece are connected to the bare cell respectively.
  • the first adapter piece and the second adapter piece are located in the buffer portion, and the first adapter piece is located between the first hot-melt connection portion and the second adapter piece.
  • the first adapter piece and the second adapter piece are both located in the buffer portion, so that the first adapter piece and the second adapter piece can be connected to the tabs on the battery core, shortening the connection path between the two, and at the same time,
  • the first adapter piece and the second adapter piece are located in the buffer portion, which can avoid the situation that the first adapter piece and the second adapter piece protrude and may be damaged by impact.
  • the plurality of hot-melt connection parts include a first hot-melt connection part, a second hot-melt connection part and a third hot-melt connection part, and the first hot-melt connection part and the The second hot-melt connection parts are respectively located at both ends of the lengthwise direction of the insulating member, and the third hot-melt connection part is located in the middle of the lengthwise direction of the insulating member,
  • the second surface has a first buffer part and a second buffer part, the first buffer part is located between the first hot-melt connection part and the third hot-melt connection part, and the second buffer part is located Between the second hot-melt connection part and the third hot-melt connection part.
  • the insulator includes three hot-melt connection parts along its own length, so that the hot-melt connection area of the insulating member and the insulating sheet can be further increased, thereby improving the reliability of the hot-melt connection between the two.
  • a first buffer portion is formed between the first thermal fusion connection portion and the third thermal fusion connection portion and the second surface
  • a second buffer portion is formed between the third thermal fusion connection portion and the second thermal fusion connection portion, thereby It can avoid and buffer the position of the battery cell corresponding to its positive and negative tabs, so as to avoid direct contact between the brittle or soft tabs and the insulation during the transportation of the energy storage device, which may cause bending or damage to the poles. ear condition.
  • the battery further includes a first adapter piece and a second adapter piece, and the first adapter piece and the second adapter piece are connected to the bare cell respectively.
  • the first tab and the second tab, and the first adapter piece and the second adapter piece are arranged on the insulating member along the length direction of the insulating member;
  • the first adapter piece is located in the first buffer portion, and the second adapter piece is located in the second buffer portion.
  • the first adapter piece is located in the first buffer part, and the second adapter piece is located in the second buffer part, which can make it easier to connect the first adapter piece and the second adapter piece to the first tab and the second tab respectively , shorten the connection path between the first adapter piece and the first tab, the second adapter piece and the second pole ear, and at the same time, it can avoid the first adapter piece and the second adapter piece being protruded and possibly damaged by impact Case.
  • a first notch is provided on a side of the first hot-melt connection part close to the first transfer piece, and a side of the second hot-melt connection part close to the second transfer piece
  • One side of the connecting piece is provided with a second notch, and corners of the first notch and the second notch are provided with chamfers.
  • the design of the chamfer can avoid the situation that the corners of the first notch and the second notch are sharp and cause the adhesive to be pierced, and ensure that the adhesive can be used on the first adapter piece and the second adapter piece on the insulator help with connection reliability on the Internet.
  • the chamfered design of the corners of the first notch and the second notch can also provide guidance for the return flow of the electrolyte, so that the electrolyte can infiltrate the bare cell faster.
  • At least one of the part of the peripheral surface located at the first hot-melt connection part and the part of the peripheral surface located at the second hot-melt connection part includes A first side and a second side opposite to each other in the width direction of the insulating member, and an end face located at one end of the insulating member in the length direction and connected between the first side and the second side, the first One side, the second side and the end face all have at least one hot-melt connection area that is hot-melt connected with the insulating sheet.
  • the insulating sheet forms a plurality of hot-melt connection regions when it is hot-melt connected with the first hot-melt connection part and the second hot-melt connection part, which can improve the thermal insulation between the insulating sheet and the first hot-melt connection part and the second hot-melt connection part. melting reliability.
  • the number of hot-melt connection areas on the first side and the second side is greater than the number of hot-melt connection areas on the end face, and/or,
  • the hot-melt connection zone is strip-shaped, and the length of the hot-melt connection zone on the first side and the second side is less than or equal to the length of the hot-melt connection zone on the end face, and/or,
  • the sum of the areas of the hot-melt connection zones on the first side and the second side is greater than the sum of the areas of the hot-melt connection zones on the end face.
  • the number of heat-melt connection areas on the first side and the second side is more, or the sum of the areas of the heat-melt connection areas on the first side and the second side is greater than the sum of the areas of the heat-melt connection areas on the end face,
  • the thermal fusion reliability of the insulating sheet in the longitudinal direction can be improved.
  • the length of the hot-melt connection areas can be set larger to ensure a sufficient hot-melt area.
  • At least one of the part of the second surface located at the first hot-melt connection part and the part of the second surface located at the second hot-melt connection part is set to There is a raised strip, one side of the raised strip is adjacent to the end surface, and at least a part of the said one side of the raised strip is thermally fused with the insulating sheet.
  • At least part of one side of the raised line is also It can be used for hot-melt connection with the insulating sheet, thereby further increasing the hot-melt area of the first hot-melt connection part, the second hot-melt connection part and the insulating sheet, and further improving the reliability of the hot-melt connection between the insulating sheet and the insulating part .
  • the distance from the edge of the hot-melt connection area to the first surface is 1mm-2mm.
  • the distance from the edge of the hot-melt connection area to the first surface can be limited, on the one hand, an operating space can be reserved for the hot-melt head to extend into, and on the other hand On the one hand, it can avoid the contact between the hot-melt connection area formed after hot-melting and the top cover body or the extension of the hot-melt connection area to the top cover body, which will cause the top cover body to be uneven and affect the sealing connection between the top cover body and the shell.
  • the hot-melt connection area extends to the top cover body, the weld between the top cover body and the shell body will be uneven and cannot be fully welded, which will lead to welding between the top cover body and the shell Conditions that adversely affect sealed connections.
  • the bare cell includes a bottom end face, two first outer faces connected to the bottom end face, and two second outer faces, and the two first outer faces are opposite to each other.
  • the two second outer surfaces are arranged opposite each other, and each second outer surface is connected between the two first outer surfaces;
  • the insulating sheet includes a bottom cladding area and a circumferential cladding area, the bottom cladding area covers the bottom end surface of the bare cell, and the circumferential cladding area includes two main cladding parts and a connection At the folded part of the main covering part, two main covering parts are respectively connected to both sides of the bottom covering area, and the two main covering parts are respectively used to cover the two first an outer side, the folded portion is configured to cover the second outer side;
  • the two main cladding parts are thermally melted connected to the first side and the second side respectively, and the folded part is thermally melted connected to the end surface.
  • the covering protection of the bare electric core can be realized.
  • the circumferential covering area includes the main covering part and the folded part, so that it can be used to cover different surfaces of the bare electric core, making the covering of the insulating sheet on the bare electric core more convenient and quick.
  • the folded parts are connected to two opposite sides of the main covering part, and the two folded parts located on the same side of the two main covering parts are covered on the same the second outer side. In this way, it is beneficial to improve the convenience of wrapping the insulating sheet on the bare cell.
  • the battery further includes an adhesive, one end of the adhesive is connected to the main covering part, and the other end is connected to the bottom covering area, and/or, the One end of the adhesive member is connected to the folded part, and the other end is connected to the main covering part, and/or, an adhesive is connected between the two folded parts on the same side of the two main covering parts pieces.
  • All of the above configurations can improve the coating reliability when the insulating sheet is coated on the outside of the bare cell, and prevent the insulating sheet from being scattered from the outside of the bare cell.
  • the part of the peripheral surface located at the first hot-melt connection part and the part of the peripheral surface located at the second hot-melt connection part both include the first side, the second side surface and the end surface
  • the two folded parts covering the same second outer surface are hot-melt connected to the same hot-melt connection area of the end face.
  • the two folded parts covering the same second outer surface are at least partially overlapped, and the same hot-melt connection area is located in the overlapping area of the two folded parts.
  • the at least partial overlap of the two folded parts can make the connection of the two folded parts tighter, and at the same time, the overlapping connection can increase the thickness of the material at the joint of the two folded parts, thereby increasing the structure of the joint of the two folded parts Strength to prevent breakage of the insulating sheet.
  • the hot-melt connection area of the end face is completely located in the overlapping area of the two folded parts. Since the thickness of the material in the overlapping area is relatively large, the hot-melt area can be increased, thereby improving the reliability of hot-melt fusion and reducing the hot-melt joint area. quantity.
  • a liquid guiding channel is formed between the folded part and the second outer surface covered by the folded part, and the liquid guiding channel is used for flowing the electrolyte.
  • the speed at which the electrolyte reaches the bare cell from the liquid injection hole provided on the top cover body can be accelerated, and the wetting effect on the side where the second outer surface of the bare cell is located can also be enhanced.
  • the energy storage device further includes an isolator, and the isolator is arranged in parallel on a side of the bottom cladding region that is away from the bottom end surface of the bare cell.
  • the spacer can support the bottom covering area, strengthen the thickness of the bottom covering area, and prevent the bottom covering area from being damaged.
  • the spacer can be used to buffer and absorb the impact from the shell, reducing the impact of the impact on the bare cell, so as to better protect the bare cell and prevent the bare cell from being damaged.
  • the active material falls off and an internal short circuit occurs.
  • the spacer is thermally fused to a side of the bottom coating region away from the bottom end surface of the bare cell, and the spacer is provided with a A plurality of ventilation holes in the area, and the plurality of ventilation holes are located on the outer periphery of the spacer where it is thermally fused with the bottom cladding area.
  • the setting of the ventilation hole not only facilitates the discharge of gas generated during the operation of the bare cell, but also plays a role in positioning the connection between the spacer and the bottom coating area.
  • the two air holes are located at both ends of the spacer along its own length direction, and the centers of the two air holes are located at the same in a straight line.
  • the center of the spacer can be made to face the center of the insulating sheet, preventing the insulating sheet and the bare cell from being eccentrically arranged on the spacer, resulting in uneven loading of the spacer, which in turn leads to local deformation or even damage of the spacer, which cannot be achieved.
  • the buffering and shock absorption effect of the bare cell can also facilitate the function of a positioning mark when the spacer is connected to the insulating sheet.
  • the bare electric core includes one or more, and when the bare electric core includes a plurality, the arrangement direction of the plurality of bare electric cores is along the bare electric core itself Arranged in the width direction, two adjacent bare cells are connected by an adhesive.
  • the number of bare cells can be set according to the actual situation, so that the application range of the battery is wider.
  • the present application discloses an electrical device, which includes the energy storage device described in the first aspect above.
  • the energy storage device and electrical equipment disclosed in this application cover the bare cell with an insulating sheet, so that the bare cell and the shell can be separated by the insulating sheet, preventing the bare cell from being damaged during the installation of the bare cell or during a long During use, the bare cell collides with the case, causing the contact with the case to affect the stability of the electrical performance of the energy storage device.
  • the end of the insulating sheet facing the top cover assembly is thermally connected to the insulating member, so that the bare electric core is separated from the casing and the top cover body, thereby enhancing the reliability of the insulating sheet covering the outside of the bare electric core , from the root to avoid the possibility of contact between the bare cell and the shell and the top cover body, prevent the short circuit of the bare cell and the shell or the top cover body, and at the same time prevent the insulating sheet from falling off due to long-term use and cause failure
  • the coating on the outside of the bare electric core is beneficial to realize the comprehensive protection of the bare electric core.
  • Fig. 1 is a schematic structural diagram of an energy storage device disclosed in an embodiment of the present application
  • Fig. 2 is a partial structural exploded schematic diagram of the energy storage device of Fig. 1;
  • Fig. 3 is a schematic diagram of the connection between the top cover assembly and the insulating sheet disclosed in the present application;
  • Fig. 4 is a partial enlarged view at B in Fig. 3;
  • Fig. 5 is a schematic structural view of the top cover assembly disclosed in the present application.
  • FIG. 6A is a schematic diagram of another viewing angle of the top cover assembly of FIG. 5;
  • Fig. 6B is a schematic exploded view of the structure of the top cover in Fig. 6A;
  • Fig. 7 is a schematic structural diagram of a bare cell disclosed in an embodiment of the present application.
  • Fig. 8 is a schematic diagram of the enclosing structure of the insulating sheet disclosed in the embodiment of the present application.
  • Fig. 9a is a schematic diagram of the first unfolded structure of the insulating sheet disclosed in the embodiment of the present application.
  • Fig. 9b is a schematic diagram of the second unfolded structure of the insulating sheet disclosed in the embodiment of the present application.
  • Fig. 9c is a schematic diagram of the third unfolded structure of the insulating sheet disclosed in the embodiment of the present application.
  • Fig. 9d is a schematic diagram of the fourth unfolded structure of the insulating sheet disclosed in the embodiment of the present application.
  • Fig. 9e is a schematic diagram of the fifth unfolded structure of the insulating sheet disclosed in the embodiment of the present application.
  • Fig. 9f is a schematic diagram of the sixth unfolded structure of the insulating sheet disclosed in the embodiment of the present application.
  • Fig. 10 is a sectional view at the A-A place in Fig. 1;
  • Figure 11 is a partial enlarged view at C in Figure 10;
  • FIG. 12 is a schematic diagram of an exploded structure of an insulating sheet and a spacer disclosed in an embodiment of the present application.
  • first means two or more.
  • the energy storage device 100 includes a casing 10 , a top cover assembly 20 and a cell assembly 30 .
  • the casing 10 has an opening and an accommodating cavity 10a located in the casing 10 and communicating with the opening.
  • the top cover assembly 20 includes a top cover body 21 and an insulator 22 (ie, lower plastic), the insulator 22 is arranged on the side of the top cover body 21 facing the accommodating cavity 10a, and the insulator 22 is located between the housing 10 and the top cover body Between 21.
  • the cell assembly 30 includes a bare cell 31 and an insulating sheet 32 covering the outside of the bare cell 31.
  • the bare cell 31 is at least partially located in the housing cavity 10a.
  • One end of the insulating sheet 32 adjacent to the top cover assembly 20 is thermally fused connected 22 so that the bare cell 31 is separated from the casing 10 and the top cover body 21 .
  • the energy storage device 100 may include, but is not limited to, a single battery, a battery module, a battery pack, a battery system, and the like.
  • the energy storage device 100 is a single battery, it can be a square battery.
  • the energy storage device 100 of the present application covers the bare cell 31 with the insulating sheet 32 , so that the bare cell 31 and the housing 10 can be separated by the insulating sheet 32 to prevent the bare cell 31 from being damaged during installation.
  • the bare cell 31 collides with the housing 10 , causing the contact with the housing 10 to affect the stability of the electrical performance of the energy storage device 100 .
  • both the insulating sheet 32 and the insulating member 22 can be made of plastic materials, in order to realize the connection between the insulating sheet 32 and the insulating member 22, one end of the insulating sheet 32 adjacent to the top cover assembly 20 is thermally connected to the insulating member 22, so that the insulating sheet 32 and the insulating member 22 can be tightly connected together, which can strengthen the reliability of the insulating sheet 32 covering the outside of the bare electric core 31, and prevent the bare electric core 31 from the root cause and the casing 10 and the top.
  • the possibility of contacting the cover body 21 prevents the bare cell 31 from contacting with the case 10 or the top cover body 21 to cause a short circuit, and at the same time prevents the insulation sheet 32 from falling off due to long-term use and cannot be covered on the outside of the bare cell 31 In this case, it is beneficial to realize the comprehensive protection of the bare cell 31 .
  • the side of the top cover body 21 facing the accommodating cavity 10a has a first surface 210, and the insulating member 22 can be disposed on the first surface 210, and The insulator 22 has a second surface 22a away from the first surface 210 and a peripheral surface 220 connected to the edge of the second surface 22a, the peripheral surface 220 extends toward the top cover body 21 along a direction perpendicular to the first surface 210, and is insulated One end of the sheet 32 adjacent to the top cover assembly 20 is thermally fused to the peripheral surface 220 .
  • the insulating member 22 is the lower plastic, and when the energy storage device 100 is assembled, it is arranged between the metal (such as metal aluminum) top cover body 21 and the bare cell 31 to block the top cover body. 21 and other components on the top cover body 21 (such as explosion-proof valves, poles, etc.) and the bare cell 31 are in contact with the top cover body 21 and the insulation between the top cover body 21 and the bare cell 31 .
  • the insulator 22 is located between the top cover body 21 and the bare cell 31, that is, the insulator 22 is also located in the housing cavity 10a of the housing 10, in order to reduce the space occupied by the insulator 22 on the housing cavity 10a, the insulator 22 is usually
  • the thickness setting is relatively thin, which can be roughly between 0.6mm-0.9mm. Based on this, considering that the thickness of the insulating sheet 32 and the insulating member 22 are both relatively thin, if the thermal melting area of the two is not enough, it will easily lead to After long-term use, the hot-melt position fails, and the insulating sheet 32 falls off from the insulating member 22.
  • the application makes the insulating sheet 32 hot-melt connected to the peripheral surface 220 of the insulating member 22.
  • the insulating sheet 32 will not occupy the second The surface space of the surface 22a and the area of the peripheral surface 220 are relatively large, so that the thermal fusion area of the insulating sheet 32 on the insulating member 22 can be increased, thereby improving the thermal fusion reliability of the insulating sheet 32 and the insulating member 22 .
  • the edge of the first surface 210 surrounds the edge of the second surface 22a, and the edge of the first surface 210 A gap 2100 (see FIG. 10 below) is formed between the edge of the second surface 22a.
  • the gap 2100 can be 1mm-1.5mm, such as 1.2mm, 1.4mm, etc.
  • the insulating sheet 32 One end adjacent to the top cover assembly 20 is located in the gap 2100 . In this way, on the one hand, there is enough space for arranging the insulating sheet 32 , and on the other hand, the insulating sheet 32 can be wrapped more outside the insulating member 22 and the electric core 31 .
  • the space between the insulating sheet 32 and the bare cell 31 and the space between the casing 10 and the insulating sheet 32 can be conducted, so that the gas inside the casing 10 can circulate inside the casing 10
  • the flow can further improve the heat dissipation function of the bare cell 31 , reduce the air pressure difference between the inside of the casing 10 and the outside, and improve the safety of the energy storage device 100 .
  • the bare cell 31 will generate gas.
  • the space between the housing 10 and the insulating sheet 32 can be connected to the space between the insulating sheet 32 and the bare cell 31, it can make The gas generated by the bare cell 31 flows between the insulating sheet 32 and the casing 10 , thereby reducing the impact force of the gas generated by the bare cell 31 on the insulating sheet 32 , and further improving the safety performance of the energy storage device 100 .
  • the airflow gap between the insulating sheet 32 and the top cover body 21 can allow gas to pass through, so that the gas generated by the bare cell 31 during operation can also pass through the airflow gap and reach the explosion-proof valve provided on the top cover body 21 , to prevent a large amount of gas from accumulating in the accommodating cavity 10a, thereby avoiding the situation that the energy storage device 100 may explode when the gas is accumulated in a large amount but the pressure is not released in time, and the safety of the energy storage device 100 is improved.
  • the insulation member includes at least one heat-melt connection portion 22b, which is disposed along a part of the edge of the second surface 22a, and one end of the insulation sheet 32 adjacent to the top cover assembly 20 is heat-melt connected to the peripheral edge The portion of the surface 220 located at the hot-melt connection portion 22b. In this way, when the insulating sheet 32 is connected to the insulating member 22, the surface space of the second surface 22a can not be occupied, and the arrangement of other devices on the insulating member 22 can be avoided. Part of the hot-melt connection can make the insulating sheet 32 have a sufficient hot-melt area.
  • the heat-melt connection portion 22b may be at least partially protruded relative to the second surface 22a, and meanwhile, the heat-melt connection portion 22b may be a boss, a convex line, a bump, etc., which may be set according to actual conditions.
  • the distance from the side of the hot-melt connection portion 22b away from the second surface 22a to the first surface 210 is 2mm-3mm, that is, along the direction perpendicular to the second surface 22a
  • the overall thickness of the hot-melt connection part 22b is 2mm-3mm, so that the hot-melt connection part 22b has enough thickness to ensure that there is enough hot-melt area to be hot-melt connected with the insulating sheet 32, and improve the insulation sheet 32 and the hot-melt connection.
  • the thermal fusion reliability of the part 22b is 2mm-3mm, so that the hot-melt connection part 22b has enough thickness to ensure that there is enough hot-melt area to be hot-melt connected with the insulating sheet 32, and improve the insulation sheet 32 and the hot-melt connection.
  • controlling the thickness of the heat-melt connection portion 22b within the above-mentioned range can also keep the heat-melt connection portion 22b light and thin as a whole, so as to avoid occupying too much space in the accommodating cavity 10a.
  • the overall thickness of the hot-melt connection part 22b may be 2.3mm, 2.5mm, 2.8mm and so on.
  • the hot-melt connection portion 22b may be disposed adjacent to and surrounding the edge of the insulating member 22 .
  • the insulator 22 is in the shape of a strip, and the heat-melt connection part 22b can be arranged around a circle near the edge of the insulator 22, so that the volume of the heat-melt connection part 22b can be made larger, thereby ensuring a Sufficient heat fusion area.
  • disposing the hot-melt connection portion 22b adjacent to the edge of the insulating member 22 can prevent the hot-melt connection portion 22b from occupying too much space on the insulating member 22, thereby avoiding affecting the position of other components (such as adapter pieces, etc.) on the insulating member 22. Setting or connection of the insulator 22 with other components.
  • the insulator 22 may be in the shape of a strip, and along the length direction of the insulator 22, the heat-melt connection part 22b may be There are multiple, and multiple hot-melt connection parts 22b are arranged at intervals.
  • the hot-melt connection part 22b is set to a plurality, and the plurality of hot-melt connection parts 22b are arranged at intervals, so that the hot-melt position with the insulating sheet 32 can be increased, and then the hot-melt area with the insulating sheet 32 can be increased, and the insulating sheet can be improved. 32 and insulation 22 thermal fusion reliability.
  • the plurality of heat-melt connection parts 22b at least include a first heat-melt connection part 221 and a second heat-melt connection part 223, and the first heat-melt connection part 221 and the second heat-melt connection part 223 are respectively located at At both ends of the insulating member 22 in the length direction, the second surface 22 a has a buffer portion 2201 , and the buffer portion 2201 is located between the first heat-melt connection portion 221 and the second heat-melt connection portion 223 .
  • the first hot-melt connection part 221 and the second hot-melt connection part 223 are respectively located at both ends of the length direction of the insulator 22.
  • the hot-melt area can be increased, and on the other hand, the insulating sheet 32 can be heat-fused to
  • the hot-melt connection part located at the two ends of the insulator 22 in the length direction will keep the heat-melt force of the insulating sheet 32 as consistent as possible, so as to avoid the possibility of pulling the insulating sheet 32 due to uneven force on both ends.
  • the insulating sheet 32 is easy to fall off when used for a long time.
  • the first hot-melt connection part 221 and the second hot-melt connection part 223 protrude from the second surface 22a
  • the first hot-melt connection part 221 and the second hot-melt connection part 223 protrude from the second surface 22a.
  • the parts have the same thickness, so that the buffer portion 2201 is formed between the first hot-melt connection portion 221, the second hot-melt connection portion 223 and the second surface 22a (that is, the buffer portion 2201 is a buffer space).
  • the depth of the buffer part 2201 is the distance between the side of the first hot-melt connection part 221 away from the second surface 22a and the second surface 22a, that is, the depth of the buffer part 2201 is the first hot-melt connection part 221
  • the height of the second hot-melt connection part 223 protruding from the second surface 22 a may be the overall thickness of the first hot-melt connection part 221 minus the thickness of the insulating member 22 itself. It can be seen from the foregoing that the overall thickness of the first hot-melt connection part 221 may be 2mm-3mm, and the overall thickness of the insulating member 22 may be 0.6mm-0.9mm.
  • the depth of the buffer part 2201 may be approximately 1.4mm-3mm. Between 2.7mm.
  • the buffer portion 2201 can realize buffering between the bare cell 31 and the insulator 22, avoiding direct contact between the bare cell 31 and the insulator 22, so that in the working condition For example, in a vibrating environment, even if the bare cell 31 is subjected to vibration, external impact, etc., it can avoid direct impact on the insulating member 22 due to the existence of the buffer portion 2201, thereby avoiding damage to the soft bare cell 31.
  • the tabs and pole pieces collide with the relatively hard plastic insulating part 22 , bending and deformation occur.
  • the energy storage device 100 of the present application further includes a first adapter piece 41 and a second adapter piece 42, and the first adapter piece 41 and the second adapter piece 42 are respectively connected to the first tab of the bare cell 31.
  • 31a, the second tab 31b, one of the first tab 31a and the second tab 31b is a positive tab, and the other is a negative tab.
  • the first adapter piece 41 and the second adapter piece 42 are arranged on the insulating member 22 along the length direction of the insulating member 22, that is, similarly, the first adapter piece 41 and the second adapter piece 42 are also roughly arranged Both ends in the lengthwise direction of the insulator 22 .
  • the first adapter piece 41 and the second adapter piece 42 can be located in the buffer portion 2201 , and the first adapter piece 41 is located between the first heat-melt connection portion 221 and the second adapter piece 42 .
  • the first adapter piece 41 and the second adapter piece 42 are both located in the buffer portion 2201, so that the first adapter piece 41 and the second adapter piece 42 can be connected with the first tab 31a and the second pole tab 31a on the bare cell 31.
  • the two pole tabs 31b are connected to shorten the connection path between the two.
  • the first adapter piece 41 and the second adapter piece 42 are located in the buffer portion, which can prevent the first adapter piece 41 and the second adapter piece 42 from protruding. out of settings and may be damaged by impact.
  • the plurality of hot-melt connection parts 22b at least include a first hot-melt connection part 221 , a second hot-melt connection part 223 and a third hot-melt connection part 222 ,
  • the first hot-melt connection part 221 and the second hot-melt connection part 223 are respectively located at both ends of the insulator 22 in the longitudinal direction
  • the third hot-melt connection part 222 is located in the middle of the insulator 22 in the longitudinal direction
  • the second surface 22a has a first buffer portion 2201a and a second buffer portion 2201b, the first buffer portion 2201a and the second buffer portion 2201b can also be buffer spaces, the depth of the first buffer portion 2201a and the second buffer portion 2201b can be Refer to the foregoing description about the buffer unit 2201 , which will not be repeated here.
  • the first buffer part 2201a is located between the first thermal fusion connection part 221 and the third thermal fusion connection part 222
  • the second buffer part 2201b is located between the second thermal fusion connection part 223 and the Between the third hot-melt connection parts 222, the first adapter piece 41 is located in the first buffer part 2201a, and the second adapter piece 42 is located in the second buffer part 2201b.
  • the insulator 22 includes three heat-melt connection parts along its own length, so that the heat-melt connection area of the insulator 22 and the insulating sheet 32 can be further increased, thereby improving the reliability of the heat-melt connection of the two.
  • first buffer portion 2201a is formed between the first hot-melt connection part 221, the third hot-melt connection part 222 and the second surface 22a, and the third hot-melt connection part 222 and the second hot-melt connection part 223 are formed
  • the second buffer part 2201b can avoid and buffer the position of the bare cell corresponding to its positive pole lug and negative pole lug, avoiding direct contact between the brittle or soft pole lug and the insulating member 22, which may cause bending or Damaged tabs.
  • first adapter piece 41 is located in the first buffer portion 2201a
  • second adapter piece 42 is located in the second buffer portion 2201b, which can make it easier for the first adapter piece 41 and the second adapter piece 42 to connect with each other respectively.
  • the connection of the first lug 31a and the second lug 31b shortens the connection path between the first adapter piece 41 and the first lug 31a, the second adapter piece 42 and the second lug 31b, and at the same time avoids the first The case where the adapter piece 41 and the second adapter piece 42 protrude and may be damaged by impact.
  • a first notch 221a is formed on the side of the first hot-melt connection part 221 close to the first adapter piece 41 , and a side of the second hot-melt connection part 223 close to the second adapter piece 42 is formed.
  • the first protruding portion 221 and the third protruding portion 223 are respectively provided with a first notch 221a and a second notch 223a to avoid the first adapter piece 41 and the second adapter piece 42 respectively, so as not to affect the first adapter piece 41 .
  • the arrangement of the second adapter piece 42 on the insulator 22 is formed on the side of the first hot-melt connection part 221 close to the first adapter piece 41 , and a side of the second hot-melt connection part 223 close to the second adapter piece 42 is formed.
  • There is a second notch 223a and the corners of
  • the corners of the first notch 221a and the second notch 223a are all provided with chamfers, which facilitates the processing and formation of the first notch 221a and the second notch 223a on the one hand, and on the other hand, because the first notch 221a and the second notch 223a Adjacent to the first adapter sheet 41 and the second adapter sheet 42, and the first adapter sheet 41 and the second adapter sheet 42 are usually provided with adhesives (such as blue film, tape, etc.) on the insulating member 22, Therefore, the design of the chamfer can avoid the situation that the corners of the first notch 221a and the second notch 223a are sharp and cause the adhesive to be punctured, and ensure that the adhesive can connect the first adapter piece 41 and the second adapter sheet 41.
  • the connection reliability of the sheet 42 on the insulator 22 helps.
  • the chamfered design of the corners of the first notch 221a and the second notch 223a can also provide a guide for the backflow of the electrolyte, so that the electrolyte can infiltrate the battery cell faster.
  • the part of the peripheral surface 220 located at the first thermally fused connection part 221 and the part of the peripheral surface 220 located at the second thermally fused connection part 223 At least one of the parts includes a first side 220a and a second side 220b oppositely arranged along the width direction of the insulator 22, and one end located in the length direction of the insulator 22 and connected to the first side 220a, the second side 220b Between the end faces 220c.
  • the insulation sheet 32 is thermally welded with the first side 220a, the second side 220b, and the end surface 220c, so that the joints between the insulation sheet 32 and the first side 220a, the second side 220b, and the end surface 220c respectively form a thermal fusion connection area 220d Therefore, a plurality of hot-melt connection regions 220d are formed between the insulating sheet 32 and the hot-melt connection part, which can improve the thermal fusion reliability of the insulating sheet 32 and the hot-melt connection part.
  • the number of hot-melt connection areas 220d on the first side 220a and the second side 220b is greater than the number of hot-melt connection areas 220d on the end surface 220c.
  • the number of heat-melt connection regions 220d on the first side 220a and the second side 220b can be at least three respectively, and the number of heat-melt connection regions 220d on the end surface 220c can be at least one.
  • the length of the heat-melt connection zone 220d on the first side 220a and the second side 220b can be less than or equal to the length of the heat-melt connection zone 220d on the end face 220c, thereby ensuring sufficient heat While reducing the melting area, the length of the hot-melt connection area 220d is reduced.
  • the sum of the areas of the hot melt connection zones 220d on the first side 220a and the second side 220b may be greater than the sum of the areas of the hot melt connection zones 220d on the end surface 220c, so that, It is ensured that the insulation sheet 32 has a sufficient hot-melt area in the length direction of the bare cell 31 to prevent it from falling off after long-term use.
  • the length of the hot-melt connection area 220d located on the end surface 220c may be greater than 1/4 of the width of the top cover body 21 itself, thereby effectively Controlling the number of hot-melt connection regions 220d on the end surface 220c and reducing the difficulty of the hot-melt process can also ensure that the hot-melt connection regions 220d on the end surface 220c have sufficient hot-melt areas.
  • At least one of the second surface 22a located at the first heat-melt connection part 221 and the part of the second surface 22a located at the second heat-melt connection part 223 is set There is a raised strip 2200 , one side of the raised strip is adjacent to the end surface 220c, and at least a part of one side of the raised strip 2200 is thermally fused with the insulating sheet 32 .
  • the protruding line 2200 can protrude from the direction away from the first surface 210 of the second surface 22a, the protruding line 2200 is also formed as a part of the heat-melt connection part, thereby further increasing the height of the first heat-melt connection part 221 and the first heat-melt connection part 221.
  • the heat-melt area of the second hot-melt connection portion 223 and the insulating sheet 32 further improves the reliability of the hot-melt connection between the insulating sheet 32 and the insulating member 22 .
  • the distance from the edge of the hot melt connection area 220d to the first surface 210 may be 1mm-2mm. That is, the distance from the edge of the hot melt connection area 220d closest to the first surface 210 of the top cover body 21 to the first surface 210 may be 1mm-2mm.
  • the hot-melt operation needs to be carried out by the hot-melt head of the hot-melt equipment during hot-melt, therefore, the distance between the edge of the hot-melt connection area 220d and the first surface 210 is limited, on the one hand, an operating space can be reserved for the hot-melt head On the other hand, it can prevent the hot-melt connection area 220d formed after hot-melting from contacting the top cover body 21 or the hot-melt connection area 220d extends to the top cover body 21, causing the top cover body 21 to be uneven and affecting the top cover
  • the distance from the edge of the hot-melt connection area 220d to the first surface 210 may be 1.2mm, 1.5mm, 1.8mm, 2mm, etc., which may be set according to actual conditions, which is not specifically limited in this embodiment.
  • the energy storage device 100 can be a square energy storage device 100
  • the bare cell 31 can be a square bare cell 31, and the bare cell 31 can include One or more, when the bare electric core 31 includes multiple, the arrangement direction of the bare electric core 31 can be arranged along the width direction of the bare electric core 31 itself, between two adjacent bare electric cores 31 It can be connected by adhesives, such as adhesive tape, blue film, etc. Therefore, the number of bare cells 31 can be set according to actual conditions, so that the application range of the energy storage device 100 is wider.
  • the bare cell 31 has a body portion 31c, and the body portion 31c may include a bottom end surface 311, two first outer surfaces 312 connected to the bottom end surface 311, and two second outer surfaces 313, wherein the two first The outer surface 312 and the two second outer surfaces 313 constitute the peripheral surface of the bare cell 31 .
  • the two first outer surfaces 312 are opposite to each other, the two second outer surfaces 313 are opposite to each other, and each second outer surface 313 is connected between the two first outer surfaces 312 .
  • the first outer surface 312 is a surface along the width direction of the bare electric core 31, and the second outer surface 313 is a surface along the length direction of the bare electric core 31, so that the surface area of the first outer surface 312 is larger than that of the second outer surface 312.
  • the surface area of the two outer sides 313 is a surface along the width direction of the bare electric core 31, and the second outer surface 313 is a surface along the length direction of the bare electric core 31, so that the surface area of the first outer surface 312 is larger than that of the second outer surface 312. The surface area of the two outer sides 313 .
  • the bare cell 31 further includes a top surface 314 , the top surface 314 is disposed toward the top cover assembly 20 and close to the insulating member 22 .
  • the above-mentioned first tab 31 a and second tab 31 b may be disposed on the top end surface 314 .
  • the above-mentioned body part 31c of the bare cell 31 can be roughly a square block, the dimension of the length direction is L1, the dimension of the width direction is W1, and the dimension of the height direction is H1.
  • the bare cell 31 as a whole It can roughly form a rectangular parallelepiped structure with length ⁇ width ⁇ height L1 ⁇ W1 ⁇ H1, and the bare cell 31 is designed into a simple and regular three-dimensional shape, which is helpful for subsequent packaging and protection of the bare cell 31, and simplifies energy storage
  • the overall structural design of the device 100 is
  • the insulating sheet 32 can be wrapped on the peripheral surface of the body part 31c of the bare cell 31, or on the bottom end surface 311 of the body part 31c of the bare cell 31, or on the bottom surface of the bare cell 31 at the same time.
  • the peripheral surface and the bottom end surface 311 of the main body portion 31c are used to improve the insulation and protection effect of the insulating sheet 32 .
  • the insulating sheet 32 can cover both the peripheral surface of the body portion 31 c and the bottom end surface 311 of the bare cell 31 to achieve insulation protection for the bare cell 31 .
  • the insulating sheet 32 includes a bottom covering area 32a and a circumferential covering area 32b.
  • the bottom covering area 32a covers the bottom end surface 311 of the body part 31c of the bare cell 31, and the circumferential covering area 32b covers It covers the peripheral surface of the main body portion 31c of the bare cell 31 .
  • the covering protection of the bare electric core 31 can be realized.
  • the circumferential covering area 32b includes the main covering part and the folded part, so that it can be used to cover different surfaces of the bare electric core 31, making the covering of the insulating sheet on the bare electric core more convenient and quick.
  • the insulating sheet 32 fully covers the bare cell 31 except the top surface 314 of the bare cell 31 through the circumferential cladding area and the bottom cladding area 32a, so as to improve the insulation and protection effect of the insulating sheet 32 .
  • the peripheral surface of the body portion 31c of the bare cell 31 includes two first outer surfaces 312 and two second outer surfaces 313, and the circumferential covering area 32b may include two main covering areas. part (the two main covering parts may be respectively marked as the first covering area 321 and the second covering area 322 hereinafter) and the folded part connected to the main covering part (ie, the side wings mentioned below), the first The covering area 321 and the second covering area 322 are respectively connected to both sides of the bottom covering area 32a, the first covering area 321 and the second covering area 322 are respectively used to cover the two first outer sides 312, and the folded part Then it is used to cover the second outer surface 313 .
  • the first cladding area 321 and the second cladding area 322 are thermally melted connected to the first side 220a and the second side 220b respectively, and the folded part is thermally melted connected to the end surface 220c. In this way, it is beneficial to improve the convenience of wrapping the insulating sheet 32 on the bare cell 31 .
  • a first side wing 321a and a second side wing 321b are respectively provided on both sides of the first cladding area 321, the shape and size of the first side wing 321a and the second side wing 321b are the same, and the second wrapping area Both sides of the covering area 322 are respectively provided with a third side wing 322a and a fourth side wing 322b.
  • the shape and size of the third side wing 322a and the fourth side wing 322b are the same.
  • the first wing 321a and the second wing 321b are respectively folded towards the second outer surface 313 of the bare cell 31, and the third wing 322a and the fourth wing 322b are also folded towards the second outer surface 313 of the bare cell 31, so that the first wing 321a is connected to the third side wing 322a, and the second side wing 321b is connected to the fourth side wing 322b, so as to realize the second outer covering of the bare cell 31 through the first side wing 321a, the second side wing 321b, the third side wing 322a, and the fourth side wing 322b. Covering of side 313 .
  • a fool-proof part 3210 is provided on the first side wing 321a and the second side wing 321b, and the fool-proof part 3210 can be a chamfer formed on the corners of the first side wing 321a and the second side wing 321b, for example, it can be The chamfered or rounded corners, through the design of the fool-proof portion 3210 , can facilitate the quick identification of the covering direction during covering.
  • the second outer surface 313 of the bare cell 31 is covered by the side wings, as shown in the structural form of the insulating sheet 32 in FIG.
  • the edge of the side wing 321a is just spliced with the edge of the third side wing 322a, and completely covers the second outer surface 313 of the bare cell 31.
  • the full coverage of the bare cell 31 can be achieved with the smallest area of the insulating sheet 32.
  • the manufacturing cost of the energy storage device 100 is saved.
  • connection form of the first side wing 321a and the third side wing 322a can be such that the first side wing 321a and the third side wing 322a at least partially overlap, that is, the edge of the first side wing 321a can overlap on the On the third wing 322a, since there is an overlapping portion between the first wing 321a and the third wing 322a, the connecting portion between the first wing 321a and the third wing 322a can be made closer, and the overlapping connection can thicken the connecting portion. The thickness of the material can further strengthen the structural strength of the connection part, and can effectively prevent the insulating sheet 32 from being damaged.
  • first side wing 321a and the third side wing 322a are in the form of just edge connection, or the connection form of the first side wing 321a and the third side wing 322a partially overlapping, the first side wing 321a and the third side wing 322a
  • the sizes may be the same or different, as long as the above-mentioned connection can be realized, and the relative size between the first side wing 321a and the third side wing 322a is not specifically limited in this embodiment.
  • connection form of the second wing 321b and the fourth wing 322b can refer to the above-mentioned first wing 321a and The connection form of the third flank 322a will not be repeated here.
  • a first bending region 321c is provided between the first flank 321a and the first covering region 321, and a first bending region 321c is provided between the second flank 321b and the first covering region 321b.
  • a second bending region 321d is provided between the covering regions 321, a third bending region 322c is provided between the third flank 322a and the second covering region 322, and a third bending region 322c is provided between the fourth flank 322b and the second covering region 322.
  • a fourth bending area 322d is arranged between them.
  • the first bending area 321c, the second bending area 321d, the third bending area 322c, and the fourth bending area 322d can form a circumferential coating when the insulating sheet 32 forms a cavity covering the bare electric core 31.
  • the four rounded corners of the area, that is, the setting of the above-mentioned bending areas can make it easier to bend the side wings relative to the covering area, making it easier for the insulating sheet 32 to form a covering cavity.
  • the bending area can be formed by imprinting indentations on the insulating sheet 32, a bending area can be formed between every two indentations, and the indentation can make the insulating sheet 32 easier to bend at the indentation position , so as to make it easier for the insulating sheet 32 to form a covering cavity.
  • the bending area can also be formed by integral molding when the insulating sheet 32 is formed, or by other means, which is not specifically limited in this embodiment.
  • the region 322 covers the first outer surface 312 of the bare cell 31
  • the flank covers the second outer surface 313 of the bare cell 31 .
  • one side of the first cladding area 321 is provided with a first wing 321a
  • the other side of the second cladding area 322 opposite to the first flank 321a is provided with a third flank 322a.
  • the first wing 321a is folded toward the second outer surface 313 of the bare cell 31, and the third wing 322a is also folded toward the second outer surface 313 of the bare cell 31, so that the first wing 321a It is connected to the side of the second cladding region 322 without a flank, and the third flank 322a is connected to the side of the first cladding region 321 without a flank, so as to achieve bare electrical connection through the first flank 321a and the third flank 322a. Covering of the second outer side 313 of the core 31 .
  • connection form of one side can be that the edge of the first side wing 321a is just spliced with the side edge of the second cladding region 322 without a side wing, and completely covers the second outer surface 313 of the bare electric core 31. At this time, it can be insulated When the area of the sheet 32 is the smallest, the bare cell 31 can be completely covered, so as to reduce the material consumption of the insulating sheet 32 and save the manufacturing cost of the energy storage device 100 .
  • connection form between the first side wing 321a and the side of the second cladding region 322 that is not provided with a flank can be the undisturbed connection between the first side wing 321a and the second cladding region 322.
  • One side of the side wings is at least partially overlapped, that is, the edge of the first side wing 321a can be overlapped on the second cladding area 322.
  • the connecting part between the first flank 321a and the second cladding area 322 is tighter, and the overlapping connection can thicken the material thickness of the connecting part, further strengthen the structural strength of the connecting part, and effectively prevent the insulating sheet 32 from being damaged.
  • connection form between the third side wing 322a and the first cladding area 321 can refer to the above-mentioned connection form of the first side wing 321a and the second cladding area 322 , which will not be repeated here.
  • connection form between the first side wing 321a and the side of the second cladding area 322 that is not provided with a wing wing can be the edge of the first side wing 321a and the second cladding area 322, when the side edges without side wings are just spliced, a first bending area 321c is provided between the first side wing 321a and the first covering area 321, and a first bending area 321c is provided between the third side wing 322a and the second covering area 322.
  • a third bending area 322c is provided.
  • the first bending area 321c and the third bending area 322c can form two rounded corners of the circumferential cladding area when the insulating sheet 32 forms a cavity covering the bare electric core 31, that is, through the above-mentioned bending areas
  • the arrangement of can make it easier to bend the side flaps relative to the cladding area, making it easier for the insulating sheet 32 to form a cladding cavity.
  • a first bending area 321c is provided between the first side wing 321a and the first covering area 321, and a bending area 321c is provided at the overlapping part of the first side wing 321a and the second covering area 322.
  • a third bending area 322c is provided between the third side wing 322a and the second covering area 322, and a fourth bending area is provided at the overlapping part of the third side wing 322a and the first covering area 321.
  • Fold area 322d is provided.
  • the first bending area 321c, the second bending area 321d, the third bending area 322c, and the fourth bending area 322d can form a circumferential coating when the insulating sheet 32 forms a cavity covering the bare electric core 31.
  • the four rounded corners of the area, that is, the setting of the above-mentioned bending areas can make it easier to bend the side wings relative to the covering area, making it easier for the insulating sheet 32 to form a covering cavity.
  • the first side wings 321a and the second side wings 321b are respectively provided on both sides of the first cladding region 321.
  • the first side wings 321a point toward the bare electric core 31.
  • the second outer side 313 of the core 31 is folded, and the second side flap 321b is also folded toward the second outer side 313 of the bare cell 31, so that the first side flap 321a is connected to the second cladding region 322, and the second side flap 321b is connected to the second wrapping region 322.
  • the covering area 322 is connected to cover the second outer surface 313 of the bare cell 31 through the first side wing 321 a and the second side wing 321 b.
  • the connection form between the first side wing 321a and the second covering area 322 can be The edge of the first wing 321a is just spliced with the edge of the side of the second cladding region 322 that is not provided with a wing, and completely covers the second outer surface 313 of the bare cell 31. At this time, the area of the insulating sheet 32 can be minimized. The full coverage of the bare electric core 31 is realized to reduce the material consumption of the insulating sheet 32 and save the manufacturing cost of the energy storage device 100 .
  • the connection form between the first side wing 321a and the second cladding region 322 may be at least part Overlap, that is, the edge of the first wing 321a can be overlapped on the second cladding area 322.
  • the first flank 321a and the second cladding area 322 can be made to overlap.
  • the connection part of the cladding area 322 is tighter, and the overlapping connection can thicken the material thickness of the connection part, further strengthen the structural strength of the connection part, and effectively prevent the insulating sheet 32 from being damaged.
  • connection form between the second side wing 321b and the second cladding area 322 can refer to the above-mentioned connection form of the first side wing 321a and the second cladding area 322 , which will not be repeated here.
  • connection form between the first flank 321a and the second covering region 322 can be such that the edge of the first flank 321a and the edge of the second covering region 322 are just spliced
  • a first bending area 321c is provided between the first side wing 321a and the first wrapping area 321
  • a second bending area 321d is set between the second side wing 321b and the first wrapping area 321 .
  • the first bending area 321c and the second bending area 321d can form two rounded corners of the circumferential cladding area when the insulating sheet 32 forms a cavity covering the bare electric core 31, that is, through the above-mentioned bending areas
  • the arrangement of can make it easier to bend the side flaps relative to the cladding area, making it easier for the insulating sheet 32 to form a cladding cavity.
  • connection form of the first side wing 321a and the second cladding region 322 can be at least part of the side of the first side wing 321a and the second cladding region 322 without the flank
  • a first bending area 321c is provided between the first wing 321a and the first cladding area 321
  • a second bending area 321d is provided at the overlapping portion of the first wing 321a and the second cladding area 322
  • a third bending area 322c is provided between the second side wing 321b and the first wrapping area 321
  • a fourth bending area 322d is set at the overlapping portion of the second side wing 321b and the second wrapping area 322 .
  • the first bending area 321c, the second bending area 321d, the third bending area 322c, and the fourth bending area 322d can form a circumferential coating when the insulating sheet 32 forms a cavity covering the bare electric core 31.
  • the four rounded corners of the region, that is, the setting of the above-mentioned bending regions can make it easier to bend the side wings relative to the covering region where they are located, making it easier for the insulating sheet 32 to form a covering cavity.
  • the structure of the first insulating sheet 32 that is, the structure of the insulating sheet 32 shown in FIG. 9a is taken as an example.
  • the size of the core 31, the size relationship between the size of each part of the insulating sheet 32 and the bare cell 31 should satisfy:
  • the length X1 of the first cladding area 321 should not be less than the height H1 of the bare cell 31, the width Y1 of the first cladding area 321 should not be less than the length L1 of the bare cell 31, and the width Y2 of the first flank 321a should not be less than Half of the width W1 of the bare cell 31 , the width Y3 of the second cladding region 322 should not be smaller than the width W1 of the bare cell 31 , namely: X1 ⁇ H1; Y1 ⁇ L1; Y2 ⁇ 1/2W1; Y3 ⁇ W1.
  • the dimensional relationship between the insulating sheet 32 and the bare cell 31 should also satisfy: X1 ⁇ H1+5mm; Y1 ⁇ L1+5mm; Y2 ⁇ W1; Y3 ⁇ W1+5mm.
  • the length X1 of the first cladding region 321 can be H1, H1+0.1mm, H1+0.2mm, H1+0.5mm, H1+1mm, H1+2mm, H1+5mm;
  • the width Y1 of the first cladding region 321 It can be L1, L1+0.1mm, L1+0.2mm, L1+0.5mm, L1+1mm, L1+2mm, L1+5mm;
  • the width Y2 of the first flank 321a can be 1/2W1, 2/3W1, 3/ 4 W1, W1;
  • the width Y3 of the second cladding region 322 can be W1, W1+0.1mm, W1+0.2mm, W1+0.5mm, W1+1mm, W1+2mm, W1+5mm.
  • the size of the above insulating sheet 32 is just some examples. In the actual design process, as long as the size of the insulating sheet 32 and the size of the bare cell 31 satisfy the above relational formula, it is not limited in this embodiment. .
  • the energy storage device 100 further includes an adhesive member 50, which can be used to bond the two connecting parts of the insulating sheet 32, so that the insulating sheet 32 surrounds the connection to form a The cavity of the core 31, and the adhesive member 50 is located outside the cavity at this time.
  • an adhesive member 50 can be used to bond the two connecting parts of the insulating sheet 32, so that the insulating sheet 32 surrounds the connection to form a The cavity of the core 31, and the adhesive member 50 is located outside the cavity at this time.
  • the arrangement of the bonding member 50 can realize the connection of the circumferential covering area and the bottom covering area 32a, so that not only the insulating sheet 32 can effectively cover the bare electric core 31, but also facilitate the subsequent storage When the bare cell 31 inside the energy device 100 is overhauled, the insulating sheet 32 is disassembled.
  • the two main cladding parts i.e. the first cladding area 321 and the second cladding area 322 respectively cover the two first outer surfaces 312, the first cladding area 321, the second cladding area
  • An adhesive member 50 may be connected between the second covering area 322 and the bottom covering area 32a. That is, one end of the adhesive member 50 is connected to the main covering portion (for example, connected to the first covering region 321 and the second covering region 322 ), and the other end is connected to the bottom covering region 32 a.
  • an adhesive member 50 is connected between the folded portion (i.e., the side flap) and the main covering portion, that is, one end of the adhesive member 50 is connected to the folded portion (i.e., the side flap), and the other end is connected to the main covering portion (such as the first covering area 321, the second covering area 322) and/or, as described in the structure in 9a above, there is an adhesive connection between the two folded parts located on the same side of the two main covering parts 50 pieces.
  • Each of the above configurations can improve the coating reliability when the insulating sheet 32 is wrapped on the outside of the bare cell 31 , and prevent the insulating sheet 32 from falling from the outside of the bare cell 31 .
  • the above-mentioned adhesive member 50 may include adhesive tape or blue film, which may be selected according to actual conditions, which is not specifically limited in this embodiment.
  • the adhesive tape can be pasted on the connecting portion between the first side wing 321 a and the third side wing 322 a and the connecting portion between the second side wing 321 b and the fourth side wing 322 b of the insulating sheet 32 .
  • the adhesive tape By pasting the adhesive tape on the above position, it is possible to fix the insulating sheet 32 and reinforce the weak position of the insulating sheet 32 . It can be understood that, in this embodiment, only one sticking position of the adhesive tape is given, and the specific sticking position can be adjusted according to the actual situation, and is not specifically limited in this embodiment.
  • no adhesive layer is provided between the insulating sheet 32 and the bare electric core 31, that is, no adhesive layer is provided on the surface of the insulating sheet 32 located inside the cavity, then the gap between the insulating sheet 32 and the bare electric core 31 is The space is mainly fixed by the above-mentioned adhesive tape. If the cavity of the insulating sheet 32 is fixed relative to the bare cell 31, it is fixed with an adhesive layer, that is, an adhesive layer is provided on the surface of the insulating sheet 32 located inside the cavity, and then the insulating sheet 32 is pasted on the adhesive layer.
  • the insulating sheet 32 is not easy to be disassembled, and at the same time, there will be residual glue on the surface of the bare cell 31 , which will affect the subsequent installation of the new insulating sheet 32 .
  • canceling the setting of the glue layer on the outer surface of the bare cell 31 can avoid the situation that the heat of the bare cell 31 cannot be dissipated due to the existence of the glue layer, that is, canceling the setting of the glue layer can improve the performance of the bare cell 31. cooling performance.
  • the removal of the glue layer makes a certain space exist between the bare cell 31 and the insulating sheet 32 , which can expand the circulation space of the electrolyte and improve the degree of infiltration of the electrolyte.
  • the insulating sheet 32 is thermally fused connected to the first side 220a, the second side 220b and the end surface 220c, based on this, the first cladding region 321, the second cladding region
  • the covering area 322 can be connected to the first side 220a and the second side 220b respectively by thermal fusion, and the two folded parts (such as the first side flap 321a and the third side flap 322a) connected to the same second outer side 313 can be thermally fused It is connected to the same hot-melt connection area 220d on the end surface 220c. Therefore, while having sufficient hot-melt area to improve the reliability of hot-melt, the setting of the hot-melt connection area 220d can also be reduced, thereby reducing the hot-melt process.
  • the first side wing 321a and the third side wing 322a are at least partially overlapped on the second outer side 313, and the same hot-melt connection area 220d can be completely located on the first side wing 321a and the third side wing 322a. within the overlapping area.
  • the at least partial overlap of the first wing 321a and the third wing 322a can make the connection between the first wing 321a and the third wing 322a closer, and at the same time, the overlapping connection can increase the strength of the connection between the first wing 321a and the third wing 322a.
  • the thickness of the material increases the structural strength of the junction of the first side wing 321a and the third side wing 322a and prevents the insulating sheet 32 from being damaged.
  • the same hot-melt connection area is completely located in the overlapping area of the first flank 321a and the third flank 322a. Since the thickness of the material in the overlapping area is relatively large, the hot-melt area can be increased, thereby improving the reliability of hot-melt. In turn, the number of hot melt connection regions 220d can be reduced.
  • the second side wing 321b and the fourth side wing 322b can be at least partially overlapped, and are also thermally fused to the same hot-melt connection area 220d on the end surface 220c, and the same hot-melt connection area 220d can also be completely located on the second side.
  • the overlapping area of the side wing 321b and the fourth side wing 322b In the overlapping area of the side wing 321b and the fourth side wing 322b.
  • a liquid guiding channel 322e is formed between the folded part (ie, any side wing) and the second outer surface 313 covered by the folded part, and the liquid guiding channel 322e is used for flowing the electrolyte. That is, in order to realize the circulation of the electrolyte between the insulating sheet 32 and the bare cell 31, to improve the wetting effect of the electrolyte, the insulating sheet 32 is provided with a liquid guide flow channel 322e, and then provides the electrolyte in the casing 10. Internal circulation channel.
  • the cavity formed by the insulating sheet 32 for wrapping the bare electric core 31 is mainly formed by bonding the above-mentioned circumferential covering region 32b and bottom covering region 32a with adhesive tape.
  • the liquid flow channel 322e can be a gap forming the connection of each cladding area, such as the junction of the first side wing 321a and the third side wing 322a, the junction of the second side wing 321b and the fourth side wing 322b, the first side wing 321a and the bottom wrapping area.
  • the liquid guiding channel 322e can also be formed by opening holes directly at any position of the circumferential covering area 32b of the insulating sheet 32, for example, in the first covering area 321, the first flank 321 a , the second flank 321 b , the second cladding region 322 , the third flank 322 a , and the fourth flank 322 b define through holes.
  • the electrolyte can circulate in the space between the bare cell 31 and the insulating sheet 32 and the space between the insulating sheet 32 and the casing 10 , so as to improve the wetting efficiency of the electrolyte.
  • the way of forming the liquid guiding channel 322e is not specifically limited in this embodiment.
  • the energy storage device 100 further includes a spacer 60, which can be arranged on the bottom covering area 32a of the insulating sheet 32.
  • the spacer 60 can support the bottom covering area 32a on the one hand, and strengthen the bottom covering area.
  • the thickness of the covering region 32a prevents damage to the bottom covering region 32a.
  • the spacer 60 can be used to buffer and absorb the impact from the housing 10, reducing the impact of the impact on the bare battery 31, so as to better protect the bare battery.
  • the core 31 is used to prevent the active material from falling off when the bare cell 31 is impacted, thereby preventing an internal short circuit.
  • the corners of the bottom surface of the housing 10 are designed to be rounded during the processing of the housing 10, when the bare battery 31 is directly placed in the housing cavity 10a of the housing 10, if the bare battery 31 and The housing 10 is directly in contact with the rounded corner of the housing 10.
  • the contact between the bare cell 31 and the rounded corner is a line contact.
  • the high pressure will cause the active material inside the bare cell 31 to fall off, causing a short circuit between the positive electrode and the negative electrode inside the bare cell 31, so that the bare cell 31 cannot realize the normal charging and discharging functions, resulting in energy storage.
  • the electrical failure of the device 100 may even cause danger.
  • the spacer 60 is provided between the bottom end surface 311 of the bare cell 31 and the bottom surface of the case 10 .
  • the bottom end surface 311 of the bare cell 31 can be spaced apart from the rounded corner of the bottom surface of the housing 10, effectively preventing the bare cell 31 from colliding with the housing.
  • the rounded corners of 10 collide to prevent the active material inside the bare cell 31 from falling, causing a short circuit in the bare cell 31 .
  • the spacer 60 can be integrally formed on the insulating sheet 32 and serve as the bottom cladding area 32a of the insulating sheet 32.
  • the bottom cladding area 32 a covers the bottom end surface 311 of the body portion 31 c of the bare cell 31 .
  • the spacer 60 is arranged parallel to the bottom end surface 311 of the bare cell 31 to achieve a stable bearing effect on the bare cell 31 , and at the same time, in order to achieve insulation protection for the bare cell 31 , the spacer 60 For insulating material.
  • the spacer 60 is a sheet structure, so that the spacer 60 can be aligned with the bare While carrying the load, the battery cell 31 reduces its occupancy rate of the inner space of the housing 10 , thereby increasing the energy density of the energy storage device 100 .
  • the thickness H of the spacer 60 is 0.1 mm to 2 mm, that is, the thickness H of the spacer 60 can be 0.1 mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc., and because the rounded corners of the bottom surface of the housing 10 have a certain size, when the distance between the bottom end surface 311 of the bare cell 31 and the bottom surface of the housing 10 is less than 0.1mm Therefore, there will inevitably be interference between the bare cell 31 and the rounded corners of the bottom surface of the housing 10 , resulting in a high possibility of the active material inside the bare cell 31 falling, which will seriously affect the stability of the electrical properties of the bare cell 31 .
  • the cell assembly 30 When the distance between the bottom end surface 311 of the bare cell 31 and the bottom surface of the casing 10 is greater than 2mm, the cell assembly 30 will occupy a large space in the housing cavity 10a of the casing 10, resulting in an increase in the overall size of the energy storage device 100.
  • the structural design of the energy storage device 100 is affected, and the energy density of the energy storage device 100 is reduced.
  • At least one surface of the spacer 60 is protruded with a raised structure 60a, that is, the spacer 60 has an opposite first surface 61 and a second surface 62, and the first surface 61 faces the spacer 60.
  • the surface on one side of the bare cell 31 , the second surface 62 is the surface on the side of the separator 60 facing the case 10 .
  • a protruding structure 60a protruding from the first surface 61 is provided on the first surface 61.
  • the friction force between the cores 31 makes the fixing of the bare cell 31 on the separator 60 more stable and does not easily slide, thereby preventing the collision between the bare cell 31 and the casing 10 .
  • a protruding structure 60a protruding from the second surface 62 is provided on the second surface 62.
  • the first surface 61 and the second surface 62 are provided with protruding structures 60 a respectively protruding from the first surface 61 and the second surface 62 .
  • a raised structure 60a on at least one surface of the separator 60, the fixing stability between the separator 60 and the bare cell 31 and the bottom surface of the case 10 can be improved, preventing the occurrence of Collision situation.
  • At least one surface of the spacer 60 is provided with a protruding structure 60a, which can reduce the difficulty of manufacturing the spacer 60.
  • a protruding structure 60a which can reduce the difficulty of manufacturing the spacer 60.
  • the protruding structure 60a may be a boss, a bump, a raised line and other structures that can protrude from the surface of the spacer 60 , which is not specifically limited in this embodiment.
  • the spacer 60 and the insulating sheet 32 are arranged separately, and the spacer 60 is arranged on the part of the bottom cladding area 32 a of the insulating sheet 32 away from the main body. 31c on one side.
  • the insulating sheet 32 can be designed as a sheet-like structure with the same overall thickness. At this time, the manufacturing difficulty of the spacer 60 and the insulating sheet 32 can be reduced, that is, they are arranged separately. Separate production of the spacer 60 and the insulating sheet 32 can be realized, and the production efficiency of the insulating sheet 32 and the spacer 60 can be effectively improved.
  • the separate arrangement can design the structures of the spacer 60 and the insulating sheet 32 separately, which further reduces the difficulty of structural design that needs to be considered when forming an integral structure.
  • the spacer 60 is arranged parallel to the side of the bottom covering area 32a of the insulating sheet 32 that is away from the main body portion 31c, so as to realize that the spacer 60, the insulating sheet 32 and the fixed stability of the bare cell 31, preventing the bare cell 31 and the insulating sheet 32 from slipping off the spacer 60; by parallel arrangement, the force on the spacer 60 can be made more uniform, and the stress on the spacer 60 can be prevented from being uneven. Breakage or damage occurs, which further affects the service life of the energy storage device 100 .
  • the sum H of the thickness of the bottom cladding area 32a of the insulating sheet 32 and the thickness of the spacer 60 is 0.1mm to 2mm, that is, the bottom cladding area 32a of the insulating sheet 32
  • the sum H of the thickness of the spacer 60 and the thickness of the spacer 60 can be 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc., and because the rounded corners of the bottom surface of the housing 10 have a certain size, when the bare cell 31
  • the distance between the bottom end surface 311 and the bottom surface of the case 10 is less than 0.1 mm, interference will inevitably occur between the bare cell 31 and the rounded corner of the bottom surface of the case 10 , so that the possibility of the active material inside the bare cell 31 falling is extremely high.
  • the cell assembly 30 will occupy a large space in the housing cavity 10a of the casing 10, resulting in an increase in the overall size of the energy storage device 100.
  • the structural design of the energy storage device 100 is affected, and the energy density of the energy storage device 100 is reduced.
  • the thickness of the spacer 60 can be greater than or equal to the thickness of the insulating sheet 32, or the thickness of the spacer 60 is twice the thickness of the insulating sheet 32, or the thickness of the spacer 60 can be three times the thickness of the insulating sheet 32. times, so that the spacer 60 can better support the bare cell 31 when it is impacted from the outside, so as to realize the cushioning and shock absorption effect of the spacer 60 on the bare cell 31 .
  • the thickness of the insulating sheet 32 can be 0.1mm-1mm.
  • the strength of the insulating sheet 32 cannot be guaranteed and is easily damaged;
  • the thickness of the insulating sheet 32 is too large, the secondary The portability of the energy storage device 100 also requires the casing 10 to have a larger accommodating cavity 10a to accommodate the bare cell 31 and the insulating sheet 32 , resulting in a larger size of the secondary energy storage device 100 .
  • the thickness of the spacer 60 can be 0.1mm-2mm. When the thickness of the spacer 60 is too small, the load-bearing strength of the spacer 60 cannot be guaranteed, and it is easy to be damaged; when the thickness of the spacer 60 is too large, secondary energy storage cannot be realized.
  • the portability of the device 100 and the thicker spacer 60 require the casing 10 to have a larger accommodating cavity 10 a to accommodate the spacer 60 , which in turn results in a larger size of the secondary energy storage device 100 .
  • an example of the thickness relationship between the insulating sheet 32 and the spacer 60 is as follows:
  • the thickness of the spacer 60 can be 0.30mm or 0.45mm; when the thickness of the insulating sheet 32 is 0.5mm, the thickness of the spacer 60 can be 1.0mm or 1.5mm; When the thickness of the insulating sheet 32 is 1.0 mm, the thickness of the spacer 60 may be 2.0 mm.
  • the above-mentioned thicknesses of the spacer 60 and the insulating sheet 32 are only some examples. In practical applications, as long as the thicknesses of the insulating sheet 32 and the spacer 60 satisfy the above-mentioned thickness range at the same time, the specific thickness values It is not specifically limited in this embodiment.
  • the spacer 60 is connected to the side of the bottom cladding area 32a of the insulating sheet 32 away from the bare cell 31 , and passes through the connection between the bare cell 31 and the casing 10
  • a spacer 60 is arranged between the bottom surfaces of the bottom surfaces, and the bare cell 31 is supported by the spacer 60 .
  • the spacer 60 can be used to buffer and absorb the impact from the shell 10, reducing the impact of the external impact on the bare cell 31, so as to better protect the bare cell 31, This prevents the bare cell 31 from falling off of the active material and causing an internal short circuit when the bare cell 31 is impacted.
  • the insulating sheet 32 and the spacer 60 are insulating materials and are made of thermoplastic technology.
  • the insulating sheet 32 made of thermoplastic technology
  • the spacer 60 has high toughness and good impact resistance.
  • the insulating sheet 32 and the spacer 60 are usually polymer insulating materials, for example, the spacer 60 may be made of polypropylene, polyethylene, etc., and the insulating sheet 32 may be made of polypropylene, polyethylene, or the like.
  • the spacer 60 will move relative to the insulating sheet 32, and the insulating sheet 32 will be subjected to the friction force from the spacer 60, causing the insulating sheet 32 to move Friction is damaged, but it cannot play a good role in insulating and protecting the bare cell 31 .
  • heat fusion connection can be adopted between the insulating sheet 32 and the spacer 60, and the surface where the spacer 60 and the insulating sheet 32 are connected is the first surface 61, the first The surface 61 has a first hot-melt connection position 61a, and the bottom cladding area 32a of the insulating sheet 32 has a second hot-melt connection position 3200.
  • the first hot-melt connection position 61a can be connected.
  • the heat-melt connection is performed with the second heat-melt connection position 3200 to achieve a stable connection between the insulating sheet 32 and the separator 60 , thereby realizing good insulation protection of the insulating sheet 32 to the bare cell 31 .
  • the spacer 60 and the insulation sheet 32 are selected to be the same material.
  • the spacer 60 and the insulating sheet 32 are the same polymer material, the molecular structure between the spacer 60 and the insulating sheet 32 is the same, and the two can have a stronger bonding force during thermal fusion, which can make the spacer 60 and the insulating sheet 32
  • the connection between the insulating sheets 32 is more stable, which further prevents the relative movement between the spacer 60 and the insulating sheets 32 , thereby damaging the insulating sheets 32 and causing the performance stability of the energy storage device 100 to decrease, or even unusable.
  • both the spacer 60 and the insulating sheet 32 are made of polypropylene material. Since the polypropylene material is a polymer insulating material, choosing this material for the spacer 60 and the insulating sheet 32 can realize insulation protection for the bare cell 31 . And because the polypropylene material is non-stretchable, it is easy to form a single-layer membrane structure. When this material is selected for the spacer 60 and the insulating sheet 32, its bearing capacity is stronger and it is not easy to be damaged, thereby improving the service life of the energy storage device 100 .
  • the material of the spacer 60 and the insulating sheet 32 can also be selected as polyethylene or other polymer insulating materials, and the specific material can be selected according to the actual situation, which is not specifically limited in this embodiment. .
  • corresponding positioning holes can be provided in the bottom cladding area 32a of the spacer 60 and the insulating sheet 32. position.
  • the first surface 61 of the spacer 60 (the surface where the spacer 60 is connected to the insulating sheet 32 ) can be provided with a vent hole penetrating to the bottom cladding area 32a, and the vent hole can be located at the above-mentioned first thermal melting point.
  • the outer periphery of the connection position 61a and the second hot-melt connection position 3200 can not only facilitate the discharge of gas generated when the bare cell 31 is in operation, but also play a role in positioning the connection between the spacer 60 and the bottom covering area 32a.
  • the ventilation holes provided on the first surface 61 of the spacer 60 are used as the first positioning holes 61b, and the ventilation holes provided on the bottom covering area 32a are used as the second positioning holes as an example for illustration.
  • two first positioning holes 61 b are arranged at intervals on the first surface 61 of the spacer 60 , and the two first positioning holes 61 b are located at both ends of the spacer 60 and on the same central line.
  • the centers of the two first positioning holes 61b are located on the central axis of the first surface 61 along the length direction (that is, the X direction in FIG. 12 ).
  • the center of the spacer 60 can be made to be opposite to the center of the insulating sheet 32, so as to prevent the eccentric arrangement of the insulating sheet 32 and the bare cell 31 on the spacer 60, resulting in uneven bearing force of the spacer 60, which in turn leads to isolation Part 60 is locally deformed or even damaged, and the buffering and shock-absorbing effect on the bare cell 31 cannot be realized.
  • the distance between the two first positioning holes 61b should not be less than half of the lengthwise dimension of the first surface 61, that is, half the length of the spacer 60, because the distance between the two first positioning holes 61b.
  • the diameter of the first positioning hole 61b should not be larger than 3mm, for example, it can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. Due to the existence of the first positioning hole 61b, the material thickness of the spacer 60 at the position of the first positioning hole 61b is smaller than that of other materials without opening structures, so that the spacer 60 is at the position of the first positioning hole 61b. The bearing capacity is reduced, so the diameter of the first positioning hole 61b cannot be too large.
  • the position of the first positioning hole 61b can avoid the first thermal fusion connection position 61a of the spacer 60, thereby avoiding the The positioning hole 61b is blocked by the first hot-melt connection position 61a, so that the first positioning hole 61b is not easy to identify.
  • the position of the first positioning hole 61b can also be set at the first thermal fusion connection position 61a of the spacer 60 , at this time, when the relative position of the spacer 60 and the insulating sheet 32 After being determined, thermal fusion connection is performed, and the first positioning hole 61b can be filled with material through thermal fusion connection, so as to enhance the load-bearing strength of the spacer 60 .
  • two second positioning holes 3201 having the same positions and diameters as the two first positioning holes 61 b are provided on the bottom surface of the bottom cladding area 32 a.
  • the center is arranged on the central axis of the bottom surface of the bottom cladding area 32a along the length direction (ie, the X direction in FIG.
  • the distance should be the distance between the two first positioning holes 61b, that is, when the spacer 60 and the insulating sheet 32 are properly connected, the first positioning hole 61b and the second positioning hole 3201 can completely overlap.
  • the center of the spacer 60 can be made to be opposite to the center of the insulating sheet 32, preventing the insulating sheet 32 and the bare cell 31 from being eccentrically arranged on the spacer 60, resulting in uneven loading of the spacer 60, which in turn causes the spacer 60 to break down. Partially deformed or even damaged, the buffering and shock-absorbing effect on the bare cell 31 cannot be realized. In addition, it is also convenient to play a role of a positioning mark when the spacer 60 is connected to the insulating sheet 32 .
  • first positioning hole 61b and the second positioning hole 3201 can not only achieve air permeability, but also the electrolyte can circulate through the positioning holes, which can improve the degree of infiltration of the electrolyte.
  • the position of the second positioning hole 3201 can avoid the second thermal fusion connection position 3200 of the insulation sheet 32, thereby avoiding the The positioning hole 3201 is blocked by the second hot-melt connection position 3200, so that the second positioning hole 3201 is not easy to identify.
  • the position of the second positioning hole 3201 can be set at the second thermal fusion connection position 3200 of the insulating sheet 32. At this time, when determining the relative position of the spacer 60 and the insulating sheet 32 After completion, hot-melt connection is performed, and the second positioning hole 3201 can be filled with material through hot-melt connection, so as to enhance the bearing strength of the insulating sheet 32 .
  • a fool-proof structure is provided on the spacer 60 , and the installation error of the spacer 60 can be effectively prevented by setting the fool-proof structure.
  • this fool-proof structure can be a fool-proof hole 63, and the fool-proof hole 63 deviates from the center line of the spacer 60 to set up to realize the fool-proof function of the fool-proof hole 63; and the fool-proof hole 63 is a through hole, by placing the fool-proof
  • the bore hole 63 is set as a through hole, which can improve the wetting effect of the electrolyte.
  • the accommodating cavity 10 a of the housing 10 is a square cavity, and the four corners of the accommodating cavity 10 a are rounded, when the spacer 60 is placed in the accommodating cavity of the housing 10 10a inside, in order to realize the tight fit between the spacer 60 and the housing 10, the spacer 60 is designed as a rectangular sheet structure, and the four corners of the spacer 60 are designed as a rounded structure, so as to realize the spacer 60 and the housing 10.
  • the spacer 60 and the housing 10 can be in surface contact, and the spacer 60 can evenly distribute the force from the housing 10 to the spacer Each position of the spacer 60 reduces the pressure on the corners and ensures the structural strength of the spacer 60 .
  • L2 is the length of the spacer 60
  • W2 is the width of the spacer 60 .
  • L1 is the length of the bare cell 31
  • W1 is the width of the bare cell 31
  • the length L2 of the spacer 60 can be L1+5mm, L1+4.6mm, L1+3mm, etc.
  • the width of the spacer 60 W2 can be W1+6mm, W1+5mm, W1+3mm, etc.
  • the length and width dimensions of the spacer 60 above are just some examples. In the actual design process, as long as the size of the spacer 60 and the size of the bare cell 31 satisfy the above relationship, in this implementation Examples are not specifically limited.
  • the present application also discloses an electric device, which may include the energy storage device described in the first aspect above.
  • the electric device may include but not limited to a vehicle, an energy storage system, and the like.

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Abstract

本申请公开了一种储能装置(100)及用电设备,储能装置(100)包括壳体(10)、顶盖组件(20)及电芯组件(30),壳体(10)具有开口和容纳腔(10a),顶盖组件(20)包括顶盖本体(21)和绝缘件(22),顶盖本体(21)密封开口,绝缘件(22)设于顶盖本体(21)朝向容纳腔(10a)的一侧,电芯组件(30)包括至少一个裸电芯(31)和包覆于裸电芯(31)外部的绝缘片(32),裸电芯(31)位于容纳腔(10a),绝缘片(32)的邻近顶盖组件(20)的一端热熔连接于绝缘件(22)。采用本申请能够加强绝缘片(32)包覆于裸电芯(31)的外部的可靠性,防止裸电芯(31)与壳体(10)或顶盖本体(21)接触可能出现短路的情况。

Description

储能装置及用电设备
本申请要求于2021年9月30日提交中国专利局、申请号为2021111684298、公开名称为电池的中国专利申请以及申请号为2021224061318、公开名称为电池的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本申请涉及新能源技术领域,尤其涉及一种储能装置及用电设备。
背景技术
相关技术的储能装置多包括壳体(多为铝壳)和裸电芯,在组装时,通常将裸电芯安装在壳体的容纳腔中以保护裸电芯。但是,在将裸电芯安装于壳体的容纳腔的过程中以及电池在长久使用过程中可能会发生例如振动、碰撞等情况,这些情况都容易导致裸电芯与壳体发生碰撞,一方面可能导致裸电芯与壳体接触发生短路,另一方面可能导致裸电芯结构受损,不论上述那一方面,都会影响储能装置的电性能的稳定性,严重时可能导致电池无法使用。
发明内容
本申请实施例公开了一种储能装置及用电设备,能够实现对裸电芯的保护,从而提高电池的电性能的稳定性。
为了实现上述目的,本申请第一方面公开了一种储能装置,所述储能装置包括
壳体,所述壳体具有开口以及位于所述壳体内并与所述开口连通的容纳腔;
顶盖组件,所述顶盖组件包括顶盖本体以及绝缘件,所述顶盖本体密封所述开口,所述绝缘件设置于所述顶盖本体的朝向所述容纳腔的一侧;以及
电芯组件,所述电芯组件包括至少一个裸电芯以及包覆于所述裸电芯外部的绝缘片,所述裸电芯位于所述容纳腔内,所述绝缘片的邻近所述顶盖组件的一端热熔连接于所述绝缘件。
通过设置绝缘片包覆于裸电芯外部,从而能够利用绝缘片隔开裸电芯和壳体,防止在安装裸电芯过程中或者是在长久使用过程中,裸电芯与壳体碰撞导致与壳体接触影响储能装置的电性能的稳定性的问题。同时,还通过将绝缘片的邻近顶盖组件的一端热熔连接于绝缘件,以使裸电芯分隔于壳体以及顶盖本体。从而能够加强绝缘片包覆于裸电芯的外部的可靠性,从根源上避免了裸电芯与壳体以及顶盖本体接触的可能,防止裸电芯与壳体或顶盖本体接触出现短路情况,同时还能防止绝缘片因长久使用可能脱落而导致无法包覆在裸电芯的外部的情况,有利于实现对裸电芯的全面保护。
一种可选地实施方式中,所述顶盖本体具有朝向所述容纳腔的第一表面,所述绝缘件设置于所述第一表面,所述绝缘件具有背离所述第一表面的第二表面以及与所述第二表面的边缘连接的周缘面,所述周缘面沿着垂直于所述第一表面的方向朝向所述顶盖本体延伸,所述绝缘片的邻近所述顶盖组件的一端热熔连接于所述绝缘件的所述周缘面。
考虑到绝缘片、绝缘件的厚度较薄,二者热熔时若热熔面积不够,则容易导致在长久使用后热熔位置失效,进而导致绝缘片自绝缘件脱落,因此,本申请通过使得绝缘片的邻近顶盖组件的一侧热熔连接于绝缘件的与第二表面连接的周缘面,一方面绝缘片不会占用第二表面的表面空间,另一方面周缘面的面积较大,从而能够增大绝缘片在绝缘件上的热熔面积,进而提高绝缘片与绝缘件的热熔可靠性。
一种可选地实施方式中,沿垂直于所述第一表面的方向看时,所述第一表面的边缘环绕包围所述第二表面的边缘,所述第一表面的边缘和所述第二表面的边缘之间形成有间隙,所述绝缘片的邻近所述顶盖组件的一端位于所述间隙内,所述间隙为1mm-1.5mm。
这样,一方面具有足够的空间设置该绝缘片,另一方面也能够使得绝缘片可较多地包裹在绝缘件、电芯的外部。
一种可选地实施方式中,所述绝缘件包括至少一个热熔连接部,所述热熔连接部沿着所述第二表 面的边缘的至少一部分设置,所述绝缘片的邻近所述顶盖组件的一端热熔连接于所述周缘面的位于所述热熔连接部的部分。
这样,绝缘片与绝缘件连接时能够不占用第二表面的空间,避免影响绝缘件上其他器件的布置,同时,绝缘片与周缘面的位于热熔连接部的部分热熔连接,能够使得绝缘片具有足够的热熔面积。
一种可选地实施方式中,沿垂直于所述第二表面的方向上,所述热熔连接部的背离所述第二表面的一面至所述第一表面的距离为2mm-3mm。即,沿裸电芯指向顶盖本体的方向上,该热熔连接部的整体厚度为2mm-3mm,从而热熔连接部具有足够的厚度,能够确保具有足够的热熔面积以与绝缘片热熔连接,提高绝缘片与热熔连接部的热熔可靠性。
一种可选地实施方式中,所述绝缘件为长条板状,所述绝缘件包括沿所述绝缘件的长度方向间隔设置的多个热熔连接部。
绝缘件包括沿绝缘件的长度方向上的多个热熔连接部,从而能够增加与绝缘片的热熔位置,进而增大与绝缘片的热熔面积,提高二者的热熔可靠性。
一种可选地实施方式中,所述多个热熔连接部至少包括第一热熔连接部和第二热熔连接部,所述第一热熔连接部和所述第二热熔连接部分别位于所述绝缘件的长度方向的两端,所述第二表面具有缓冲部,所述缓冲部位于所述第一热熔连接部和所述第二热熔连接部之间。
采用第一热熔连接部和第二热熔连接部分别位于绝缘件的长度方向的两端,一方面能够增大热熔面积,另一方面,能够使得在绝缘片热熔于热熔连接部上时,位于绝缘件的长度方向上的两端的热熔连接部对绝缘片的热熔作用力尽可能保持一致,避免因两端受力不均而拉扯绝缘片导致绝缘片在长久使用后可能出现的易脱落情况。
进一步地,由于第一热熔连接部、第二热熔连接部相对第二表面凸出设置,从而第一热熔连接部、第二热熔连接部与第二表面之间形成该缓冲部,沿裸电芯的高度方向上,利用该缓冲部能够实现电芯和绝缘件之间的缓冲,使得避免电芯直接与绝缘件之间接触,避免在组装过程中或者是长久使用过程中电池出现碰撞、撞击等情况时,电芯可能撞击绝缘件而导致电芯可能出现损坏的情况。
一种可选地实施方式中,所述电池还包括第一转接片、第二转接片,所述第一转接片、所述第二转接片分别连接于所述裸电芯的第一极耳、第二极耳;
所述第一转接片和所述第二转接片位于所述缓冲部内,所述第一转接片位于所述第一热熔连接部和所述第二转接片之间。
设置第一转接片、第二转接片均位于缓冲部内,从而第一转接片、第二转接片能够与电芯上的极耳连接,缩短二者之间的连接路径,同时,第一转接片、第二转接片位于缓冲部内,能够避免第一转接片、第二转接片凸出设置而可能被撞击损坏的情况。
一种可选地实施方式中,所述多个热熔连接部包括第一热熔连接部、第二热熔连接部以及第三热熔连接部,所述第一热熔连接部和所述第二热熔连接部分别位于所述绝缘件的长度方向的两端,所述第三热熔连接部位于所述绝缘件的长度方向的中部,
所述第二表面具有第一缓冲部和第二缓冲部,所述第一缓冲部位于所述第一热熔连接部和所述第三热熔连接部之间,所述第二缓冲部位于所述第二热熔连接部和所述第三热熔连接部之间。
绝缘件包括沿其自身长度方向上的三个热熔连接部,从而能够进一步增大绝缘件与绝缘片的热熔连接面积,从而提高二者的热熔连接的可靠性。
此外,通过第一热熔连接部和第三热熔连接部与第二表面之间形成第一缓冲部,第三热熔连接部和第二热熔连接部之间形成第二缓冲部,从而能够对电芯对应于其正极极耳、负极极耳的位置进行避让和缓冲,避免在储能装置运输过程中脆性或者是柔软的极耳与绝缘件直接接触而可能导致折弯或者是损坏极耳的情况。
一种可选地实施方式中,所述电池还包括第一转接片、第二转接片,所述第一转接片、所述第二 转接片分别连接于所述裸电芯的第一极耳、第二极耳,且所述第一转接片、所述第二转接片沿所述绝缘件的长度方向上设置于所述绝缘件;
所述第一转接片位于所述第一缓冲部内,所述第二转接片位于所述第二缓冲部。
将第一转接片位于第一缓冲部内,第二转接片位于第二缓冲部内,能够更便于第一转接片、第二转接片分别与第一极耳、第二极耳的连接,缩短第一转接片与第一极耳、第二转接片与第二极耳的连接路径,同时还能够避免第一转接片、第二转接片凸出设置而可能被撞击损坏的情况。
一种可选地实施方式中,所述第一热熔连接部的靠近所述第一转接片的一侧设有第一缺口,所述第二热熔连接部的靠近所述第二转接片的一侧设有第二缺口,所述第一缺口、所述第二缺口的边角均设有倒角。
通过第一缺口、第二缺口的设置,且第一缺口、第二缺口的边角均设有倒角,一方面便于第一缺口、第二缺口的加工形成,另一方面,由于第一缺口、第二缺口靠近第一转接片、第二转接片设置,而第一转接片、第二转接片在绝缘件上通常设置有粘接件(例如蓝膜、胶带等),因此,倒角的设计能够避免第一缺口、第二缺口的边角为尖角而导致刺破粘接件的情况,确保粘接件能够对第一转接片、第二转接片在绝缘件上的连接可靠性起到帮助。
此外,第一缺口、第二缺口的边角处为倒角的设计还能够对电解液的回流提供导向作用,使得电解液能够更快浸润裸电芯。
一种可选地实施方式中,所述周缘面的位于所述第一热熔连接部的部分和所述周缘面的位于所述第二热熔连接部的部分中至少一者包括沿所述绝缘件的宽度方向相背设置的第一侧面和第二侧面,以及位于所述绝缘件的长度方向的一端并连接于所述第一侧面和所述第二侧面之间的端面,所述第一侧面、所述第二侧面以及所述端面均具有与所述绝缘片热熔连接的至少一个热熔连接区。
从而,绝缘片在与第一热熔连接部、第二热熔连接部热熔连接形成多个热熔连接区,能够提高绝缘片与第一热熔连接部、第二热熔连接部的热熔可靠性。
一种可选地实施方式中,所述第一侧面、所述第二侧面上的热熔连接区的数量大于所述端面上的热熔连接区的数量,和/或,
所述热熔连接区为长条状,所述第一侧面、所述第二侧面上的热熔连接区的长度小于或等于所述端面上的热熔连接区的长度,和/或,
所述第一侧面、所述第二侧面上的各所述热熔连接区的面积之和大于所述端面上的各所述热熔连接区的面积之和。
第一侧面、第二侧面上的热熔连接区的数量更多,或者,第一侧面、第二侧面上的各热熔连接区的面积之和大于端面的热熔连接区的面积之和,能够提高绝缘片在长度方向上的热熔可靠性。同时,由于端面上的热熔连接区数量少,因此其热熔连接区的长度可设置大一些,以保证足够的热熔面积。
一种可选地实施方式中,所述第二表面的位于所述第一热熔连接部的部分和所述第二表面的位于所述第二热熔连接部的部分中的至少一者设有凸条,所述凸条的一侧面邻接于所述端面,所述凸条的所述一侧面的至少一部分与所述绝缘片热熔连接。
通过在第一热熔连接部的部分和第二热熔连接部的部分中的至少一者设置凸条,并使得凸条的一侧面邻接于端面,从而该凸条的一侧面的至少部分也可用于与绝缘片热熔连接,由此能够进一步增大第一热熔连接部、第二热熔连接部与绝缘片的热熔面积,进一步提高绝缘片与绝缘件的热熔连接的可靠性。
一种可选地实施方式中,沿垂直于所述第一表面的方向上,所述热熔连接区的边缘至所述第一表面的距离为1mm-2mm。
由于热熔时需要通过热熔设备的热熔头进行热熔操作,因此,限定热熔连接区的边缘至第一表面的距离,一方面能够预留出操作空间供热熔头伸入,另一方面与能够避免热熔后形成的热熔连接区与 顶盖本体接触或者是热熔连接区延伸至顶盖本体上,导致顶盖本体不平整,影响顶盖本体与壳体的密封连接,尤其是顶盖本体与壳体采用焊接时,若热熔连接区延伸至顶盖本体,将导致顶盖本体与壳体的焊接处不平整无法满焊,进而导致顶盖本体与壳体出现焊接不良影响密封连接的情况。
一种可选地实施方式中,所述裸电芯包括底端面、连接于所述底端面的两个第一外侧面以及两个第二外侧面,两个所述第一外侧面相对设置,两个所述第二外侧面相对设置,且各所述第二外侧面连接于两个所述第一外侧面之间;
所述绝缘片包括底部包覆区以及周向包覆区,所述底部包覆区覆盖所述裸电芯的所述底端面,所述周向包覆区包括两个主包覆部分和连接于所述主包覆部分的折叠部分,两个所述主包覆部分分别连接于所述底部包覆区的两侧,两个所述主包覆部分分别用于覆盖两个所述第一外侧面,所述折叠部分用于覆盖所述第二外侧面;
两个所述主包覆部分分别热熔连接于所述第一侧面、所述第二侧面,所述折叠部分热熔连接于所述端面。
通过将绝缘片分为底部包覆区和周向包覆区以覆盖裸电芯的不同部位,从而能够实现对裸电芯的包覆保护。同时,设置周向包覆区包括主包覆部分和折叠部分,从而能够用于包覆裸电芯的不同表面,使得绝缘片包覆于裸电芯时的包覆更加方便、快捷。
一种可选地实施方式中,所述主包覆部分的两相对侧均连接有所述折叠部分,位于两个所述主包覆部分的同一侧的两个所述折叠部分包覆于同一所述第二外侧面。这样,有利于提高绝缘片包覆于裸电芯的便捷性。
一种可选地实施方式中,所述电池还包括粘接件,所述粘接件一端连接于所述主包覆部分,另外一端连接于所述底部包覆区,和/或,所述粘接件一端连接于所述折叠部分,另外一端连接于所述主包覆部分,和/或,位于两个所述主包覆部分的同一侧两个所述折叠部分之间连接有粘接件。
上述设置均能够提高绝缘片包覆于裸电芯的外部时的包覆可靠性,防止绝缘片自裸电芯外部散落。
一种可选地实施方式中,所述周缘面的位于所述第一热熔连接部的部分和所述周缘面的位于所述第二热熔连接部的部分均包括所述第一侧面、所述第二侧面以及所述端面,
覆盖同一所述第二外侧面的两个所述折叠部分热熔连接于所述端面的同一热熔连接区。
从而,在具有足够的热熔面积以提高热熔可靠性的同时,还可以减少热熔连接区的设置,进而减少热熔工序。
一种可选地实施方式中,覆盖同一所述第二外侧面的两个所述折叠部分至少部分重合,所述同一热熔连接区位于两个所述折叠部分的重合区域内。
一方面,两个折叠部分至少部分重合能够使得两个折叠部分的连接更加紧密,同时重叠连接可以增大两个折叠部分的连接处的材料厚度,从而增大两个折叠部分的连接处的结构强度,防止绝缘片发生破损。另一方面,端面热熔连接区完全位于两个折叠部分的重合区域内,由于重合区域的材料厚度较大,能够增大热熔面积,从而提高热熔可靠性,进而可以减少热熔连接区的数量。
一种可选地实施方式中,所述折叠部分和所述折叠部分所覆盖的所述第二外侧面之间形成有导液流道,所述导液流道用于供电解液流过。这样,能够加快电解液自设置于顶盖本体上的注液孔到达裸电芯的速度,同时还能够加强对裸电芯的第二外侧面所在侧的浸润效果。
一种可选地实施方式中,所述储能装置还包括隔离件,所述隔离件平行设置于所述底部包覆区的背离所述裸电芯的底端面的一侧面。利用隔离件一方面能够承托底部包覆区,加强底部包覆区的厚度,防止底部包覆区出现破损。另一方面,在壳体受到外界冲击时,可以利用隔离件对来自壳体的冲击进行缓冲、减震,减小冲击对裸电芯的冲击作用,以更好地保护裸电芯,防止裸电芯在受冲击时发生活性物质脱落进而发生内部短路的情况。
一种可选地实施方式中,所述隔离件热熔于所述底部包覆区的背离所述裸电芯的底端面的一侧面, 所述隔离件上设有贯通至所述底部包覆区的多个透气孔,多个所述透气孔位于所述隔离件的与所述底部包覆区热熔位置的外周。
透气孔的设置,不仅能够方便裸电芯工作时产生的气体排出,同时还能够对隔离件与底部包覆区的连接起到定位作用。
一种可选地实施方式中,所述透气孔为两个,两个所述透气孔分位于所述隔离件的沿其自身长度方向上的两端,且两所述透气孔的中心位于同一直线上。
这样,可以使得隔离件的中心与绝缘片的中心相对,防止绝缘片以及裸电芯偏心设置于隔离件而导致隔离件的承载受力不均,进而导致隔离件发生局部变形甚至损坏,无法实现对裸电芯的缓冲减震作用的情况。此外,还可以便于在隔离件与绝缘片连接时起到定位标识作用。
一种可选地实施方式中,所述裸电芯包括一个或多个,所述裸电芯包括多个时,多个所述裸电芯的排布方向为沿着所述裸电芯自身宽度方向排列,相邻的两个所述裸电芯之间通过粘接件连接。
从而,可根据实际情况设置裸电芯的数量,使得电池的适用范围更广。
第二方面,本申请公开了一种用电设备,其包括如上述第一方面所述的储能装置。
与现有技术相比,本申请具有如下有益效果:
本申请公开的储能装置及用电设备,通过设置绝缘片包覆于裸电芯外部,从而能够利用绝缘片隔开裸电芯和壳体,防止在安装裸电芯过程中或者是在长久使用过程中,裸电芯与壳体碰撞导致与壳体接触影响储能装置的电性能的稳定性的问题。同时,还通过将绝缘片的朝向顶盖组件的一端热熔连接于绝缘件,使得裸电芯分隔于壳体以及顶盖本体,从而能够加强绝缘片包覆于裸电芯的外部的可靠性,从根源上避免了裸电芯与壳体以及顶盖本体接触的可能,防止裸电芯与壳体或顶盖本体接触出现短路情况,同时还能防止绝缘片因长久使用可能脱落而导致无法包覆在裸电芯的外部的情况,有利于实现对裸电芯的全面保护。
附图说明
为了更清楚地说明本申请实施例中的技术方案,下面将对实施例中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本申请的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1是本申请实施例公开的储能装置的结构示意图;
图2是图1的储能装置的部分结构分解示意图;
图3是本申请公开的顶盖组件与绝缘片连接的示意图;
图4是图3中的B处的局部放大图;
图5是本申请公开的顶盖组件的结构示意图;
图6A是图5的顶盖组件的另一视角的示意图;
图6B是图6A中的顶盖的结构分解示意图;
图7是本申请实施例公开的裸电芯的结构示意图;
图8是本申请实施例公开的绝缘片的围合结构示意图;
图9a是本申请实施例公开的绝缘片的第一种展开结构示意图;
图9b是本申请实施例公开的绝缘片的第二种展开结构示意图;
图9c是本申请实施例公开的绝缘片的第三种展开结构示意图;
图9d是本申请实施例公开的绝缘片的第四种展开结构示意图;
图9e是本申请实施例公开的绝缘片的第五种展开结构示意图;
图9f是本申请实施例公开的绝缘片的第六种展开结构示意图;
图10是图1中的A-A处的剖视图;
图11是图10中的C处的局部放大图;
图12是本申请实施例公开的绝缘片与隔离件的分解结构示意图。
主要附图标记
100、储能装置;10、壳体;10a、容纳腔;20、顶盖组件;21、顶盖本体;210、第一表面;2100、间隙;22、绝缘件;22a、第二表面;22b、热熔连接部;220、周缘面;2201、缓冲部;2201a、第一缓冲部;2201b、第二缓冲部;220a、第一侧面;220b、第二侧面;220c、端面;2200、凸条;220d、热熔连接区;221、第一热熔连接部;221a、第一缺口;222、第二热熔连接部;223、第三热熔连接部;223a、第二缺口;30、电芯组件;31、裸电芯;31a、第一极耳;31b、第二极耳;31c、本体部;311、底端面;312、第一外侧面;313、第二外侧面;314、顶端面;32、绝缘片;32a、底部包覆区;32b、周向包覆区;321、第一包覆区;321a、第一侧翼;321b、第二侧翼;321c、第一弯折区;321d、第二弯折区;322、第二包覆区;322a、第三侧翼;322b、第四侧翼;322c、第三弯折区;322d、第四弯折区;322e、导液流道;3200、第二热熔连接位置;3201、第二定位孔;41、第一转接片;42、第二转接片;50、粘接件;60、隔离件;60a、凸起结构;61、第一面;61a、第一热熔连接位置;61b、第一定位孔;62、第二面;63、防呆孔。
具体实施方式
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。
并且,上述部分术语除了可以用于表示方位或位置关系以外,还可能用于表示其他含义,例如术语“上”在某些情况下也可能用于表示某种依附关系或连接关系。对于本领域普通技术人员而言,可以根据具体情况理解这些术语在本申请中的具体含义。
此外,术语“第一”、“第二”等主要是用于区分不同的装置、元件或组成部分(具体的种类和构造可能相同也可能不同),并非用于表明或暗示所指示装置、元件或组成部分的相对重要性和数量。除非另有说明,“多个”的含义为两个或两个以上。
下面将结合实施例和附图对本申请的技术方案作进一步的说明。
请一并参阅图1至图3,本申请第一方面公开了一种储能装置。具体地,该储能装置100包括壳体10、顶盖组件20以及电芯组件30。该壳体10具有开口和位于壳体10内并与开口连通的容纳腔10a。顶盖组件20包括顶盖本体21以及绝缘件22(即下塑胶),该绝缘件22设置于顶盖本体21的朝向容纳腔10a的一侧,且绝缘件22位于壳体10和顶盖本体21之间。电芯组件30包括裸电芯31以及包覆于裸电芯31外部的绝缘片32,裸电芯31至少部分位于容纳腔10a,绝缘片32的邻近顶盖组件20的一端热熔连接于绝缘件22,以使裸电芯31分隔于壳体10和顶盖本体21。
可以理解的是,储能装置100可包括但不限于单体电池、电池模组、电池包、电池系统等。当该储能装置100为单体电池时,其可为方形电池。
本申请的储能装置100通过设置绝缘片32包覆于裸电芯31的外部,从而能够利用绝缘片32隔开裸电芯31和壳体10,防止在安装裸电芯31过程中或者是在长久使用过程中,裸电芯31与壳体10碰撞导致与壳体10接触影响储能装置100的电性能的稳定性的问题。同时,考虑到绝缘片32和绝缘件22均可采用塑胶材料,因此,为了实现绝缘片32和绝缘件22的连接,通过将绝缘片32的邻近顶盖组件20的一端热熔连接于绝缘件22,使得绝缘片32与绝缘件22能够紧密连接在一起,这样能够加强绝缘片32包覆于裸电芯31的外部的可靠性,从根源上避免了裸电芯31与壳体10以及顶盖本体21接触的可能,防止裸电芯31与壳体10或顶盖本体21接触出现短路情况,同时还能防止绝缘片32因长久使用可能脱落而导致无法包覆在裸电芯31的外部的情况,有利于实现对裸电芯31的全面保护。
结合图4、图5、图6A、图6B所示,一些实施例中,顶盖本体21的朝向容纳腔10a的一侧具有第一表面210,绝缘件22可设置于第一表面210,且该绝缘件22具有背离第一表面210的第二表面 22a以及与第二表面22a的边缘连接的周缘面220,周缘面220沿着垂直于第一表面210的方向朝向顶盖本体21延伸,绝缘片32的邻近顶盖组件20的一端热熔连接于该周缘面220。具体地,由前述可知,绝缘件22即为下塑胶,在组装储能装置100时,其设置在金属(例如金属铝)的顶盖本体21和裸电芯31之间,以阻隔顶盖本体21以及顶盖本体21上的其他部件(例如防爆阀、极柱等)与裸电芯31的接触,实现顶盖本体21以及顶盖本体21与裸电芯31之间的绝缘。
由于绝缘件22位于顶盖本体21和裸电芯31之间,即绝缘件22也位于壳体10的容纳腔10a,因此,为了减少绝缘件22对容纳腔10a的空间占用,通常绝缘件22的厚度设置较薄,大致可为0.6mm-0.9mm之间,基于此,考虑到绝缘片32、绝缘件22的厚度均较薄,二者热熔时若热熔面积不够,则容易导致在长久使用后热熔位置失效,进而导致绝缘片32自绝缘件22脱落,因此,本申请通过使得绝缘片32热熔连接于绝缘件22的周缘面220,一方面绝缘片32不会占用第二表面22a的表面空间,另一方面周缘面220的面积较大,从而能够增大绝缘片32在绝缘件22上的热熔面积,进而提高绝缘片32与绝缘件22的热熔可靠性。
进一步地,在绝缘片32热熔连接于热熔连接部时,沿垂直于第一表面210的方向看时,第一表面210的边缘包围第二表面22a的边缘,且第一表面210的边缘与第二表面22a的边缘之间形成有间隙2100(参见下图10所示),可选地,该间隙2100可为1mm-1.5mm,例如可为1.2mm、1.4mm等,绝缘片32的邻近顶盖组件20的一端位于该间隙2100内。这样,一方面具有足够的空间设置该绝缘片32,另一方面也能够使得绝缘片32可较多地包裹在绝缘件22、电芯31的外部。
进一步地,该绝缘片32的朝向顶盖本体21的一端至第一表面210之间具有气流间隙,即,绝缘片32的与热熔连接部的侧面220热熔连接的一端与第一表面210间隔设置,这样,一方面能够防止在顶盖本体21与壳体10进行密封连接时绝缘片32与顶盖本体21发生干涉,导致绝缘片32发生卷边的情况,进而导致绝缘片32变形。另一方面,可以使得绝缘片32与裸电芯31之间的空间与壳体10与绝缘片32之间的空间进行导通,以使得壳体10内部的气体可以在壳体10内部进行循环流动,进而可以提高对裸电芯31的散热功能,减小壳体10内部与外界的气压差,提高储能装置100的安全性。同时,在储能装置100的使用过程中,裸电芯31会产生气体,由于壳体10与绝缘片32之间的空间可以连通于绝缘片32与裸电芯31之间的空间,可以使得裸电芯31产生的气体流动到绝缘片32与壳体10之间,进而可以减轻裸电芯31产生的气体对绝缘片32的冲压力,进一步提高储能装置100的安全性能。此外,绝缘片32与顶盖本体21之间的气流间隙能够供气体通过,从而裸电芯31在运行时产生的气体也能够通过该气流间隙通过到达设置于顶盖本体21上的防爆阀处,避免气体大量积聚在容纳腔10a中,进而能够避免气体大量积聚但未及时泄压时可能导致储能装置100发生爆炸的情况,提高储能装置100的使用安全性。
一些实施例中,绝缘件包括至少一个热熔连接部22b,该热熔连接部22b沿着第二表面22a的边缘的一部分设置,绝缘片32的邻近顶盖组件20的一端热熔连接于周缘面220的位于热熔连接部22b的部分。这样,绝缘片32与绝缘件22连接时能够不占用第二表面22a的表面空间,避免影响绝缘件22上的其他器件的布置,同时,绝缘片32与周缘面220的位于热熔连接部22b的部分热熔连接,能够使得绝缘片32具有足够的热熔面积。
可选地,该热熔连接部22b可相对第二表面22a至少部分凸出设置,同时,该热熔连接部22b可为凸台、凸条、凸块等,具体可根据实际情况设置。沿垂直于第二表面22a的方向上,该热熔连接部22b的背离第二表面22a的一面至第一表面210的距离为2mm-3mm,即,沿垂直于第二表面22a的方向上,该热熔连接部22b的整体厚度为2mm-3mm,从而热熔连接部22b具有足够的厚度,能够确保具有足够的热熔面积以与绝缘片32热熔连接,提高绝缘片32与热熔连接部22b的热熔可靠性。同时,将该热熔连接部22b的厚度控制在上述范围内,还可使得该热熔连接部22b整体保持轻薄,以避免过多占用容纳腔10a中的空间。示例性的,该热熔连接部22b的整体厚度可为2.3mm、2.5mm、2.8mm 等。
一些可选地示例中,该热熔连接部22b可邻近绝缘件22的边缘设置且环绕绝缘件22的边缘设置。例如,该绝缘件22为长条板状,该热熔连接部22b可在靠近绝缘件22的边缘的位置环绕一圈设置,从而能够使得热熔连接部22b的体积更大,从而能够确保具有足够的热熔面积。此外,将热熔连接部22b邻近绝缘件22的边缘设置,能够避免热熔连接部22b过多占用绝缘件22上的空间,进而避免影响绝缘件22上其他部件(例如转接片等)的设置或者是绝缘件22与其他部件的连接。
如图4、图5、图6A以及图6B所示,另一些可选地示例中,该绝缘件22可为长条板状,沿绝缘件22的长度方向上,该热熔连接部22b可具有多个,且多个热熔连接部22b间隔设置。将热熔连接部22b设置为多个,且多个热熔连接部22b间隔设置,这样,能够增加与绝缘片32的热熔位置,进而增大与绝缘片32的热熔面积,提高绝缘片32与绝缘件22的热熔可靠性。
一些可选地实施方式中,多个热熔连接部22b至少包括第一热熔连接部221和第二热熔连接部223,第一热熔连接部221和第二热熔连接部223分别位于绝缘件22的长度方向的两端,第二表面22a具有缓冲部2201,所述缓冲部2201位于所述第一热熔连接部221和所述第二热熔连接部223之间。
采用第一热熔连接部221和第二热熔连接部223分别位于绝缘件22的长度方向的两端,一方面能够增大热熔面积,另一方面,能够使得在绝缘片32热熔于热熔连接部上时,位于绝缘件22的长度方向上的两端的热熔连接部对绝缘片32的热熔作用力尽可能保持一致,避免因两端受力不均可能拉扯绝缘片32导致绝缘片32在长久使用时出现易脱落情况。
此外,由于第一热熔连接部221、第二热熔连接部223部分相对第二表面22a凸出设置,第一热熔连接部221、第二热熔连接部223凸出第二表面22a的部分厚度相同,从而第一热熔连接部221、第二热熔连接部223与第二表面22a之间形成该缓冲部2201(即该缓冲部2201为缓冲空间),沿垂直于第一表面210的方向上,缓冲部2201的深度即为第一热熔连接部221背离第二表面22a的一面至第二表面22a之间的距离,即,缓冲部2201的深度为第一热熔连接部221或第二热熔连接部223凸出该第二表面22a的高度,该高度可为第一热熔连接部221的整体厚度减去绝缘件22的自身厚度。由前述可知,该第一热熔连接部221的整体厚度可为2mm-3mm,该绝缘件22的整体厚度可为0.6mm-0.9mm,因此,该缓冲部2201的深度可大致为1.4mm-2.7mm之间。沿裸电芯31的高度方向上,利用该缓冲部2201能够实现裸电芯31和绝缘件22之间的缓冲,避免裸电芯31直接与绝缘件22之间接触,从而在使用工况中,例如振动的环境下,该裸电芯31即便受到振动、外力撞击等情况下,也能够由于该缓冲部2201的存在而避免直接撞击于绝缘件22,进而避免柔软的裸电芯31上的极耳、极片撞击于相对硬质的塑胶绝缘件22时发生弯折、变形等情况。
一些实施例中,考虑到该裸电芯31上的极耳主要是通过转接片实现与设置在顶盖本体21上的极柱的电连接,且通常极耳都会包括正极耳、负极耳,极柱会包括正极柱、负极柱。因此,本申请的储能装置100还包括第一转接片41、第二转接片42,第一转接片41、第二转接片42分别连接于裸电芯31的第一极耳31a、第二极耳31b,第一极耳31a和第二极耳31b中的一个为正极耳,另一个为负极耳。该第一转接片41、第二转接片42沿绝缘件22的长度方向上设置于该绝缘件22,即,同样的,第一转接片41、第二转接片42也大致设置在绝缘件22的长度方向上的两端。该第一转接片41、第二转接片42可位于该缓冲部2201内,且该第一转接片41位于该第一热熔连接部221和第二转接片42之间。
设置第一转接片41、第二转接片42均位于缓冲部2201内,从而第一转接片41、第二转接片42能够与裸电芯31上的第一极耳31a、第二极耳31b连接,缩短二者之间的连接路径,同时,第一转接片41、第二转接片42位于缓冲部内,能够避免第一转接片41、第二转接片42凸出设置而可能被撞击损坏的情况。
另一些可选地实施方式中,如图6A和图6B所示,多个热熔连接部22b至少包括第一热熔连接部 221、第二热熔连接部223和第三热熔部222,第一热熔连接部221和所述第二热熔连接部223分别位于绝缘件22的长度方向的两端,第三热熔连接部222位于所述绝缘件22的长度方向的中部,
第二表面22a具有第一缓冲部2201a和第二缓冲部2201b,该第一缓冲部2201a和第二缓冲部2201b同样可为缓冲空间,第一缓冲部2201a和第二缓冲部2201b的深度情况可参考前述关于缓冲部2201的描述,此处不再赘述。所述第一缓冲部2201a位于所述第一热熔连接部221和所述第三热熔连接部222之间,所述第二缓冲部2201b位于所述第二热熔连接部223和所述第三热熔连接部222之间,该第一转接片41位于第一缓冲部2201a内,第二转接片42位于第二缓冲部2201b内。
绝缘件22包括沿其自身长度方向上的三个热熔连接部,从而能够进一步增大绝缘件22与绝缘片32的热熔连接面积,从而提高二者的热熔连接的可靠性。
此外,通过第一热熔连接部221、第三热熔连接部222与第二表面22a之间形成第一缓冲部2201a,第三热熔连接部222和第二热熔连接部223之间形成第二缓冲部2201b,从而能够对裸电芯对应于其正极极耳、负极极耳的位置进行避让和缓冲,避免脆性或者是柔软的极耳与绝缘件22直接接触而可能导致折弯或者是损坏极耳的情况。
进一步地,将第一转接片41位于第一缓冲部2201a内,第二转接片42位于第二缓冲部2201b内,能够更便于第一转接片41、第二转接片42分别与第一极耳、31a第二极耳31b的连接,缩短第一转接片41与第一极耳31a、第二转接片42与第二极耳31b的连接路径,同时还能够避免第一转接片41、第二转接片42凸出设置而可能被撞击损坏的情况。
一些实施例中,该第一热熔连接部221的靠近第一转接片41的一侧设有第一缺口221a,第二热熔连接部223的靠近第二转接片42的一侧设有第二缺口223a,第一缺口221a、第二缺口223a的边角均设有倒角。第一凸起部221、第三凸起部223分别设置第一缺口221a、第二缺口223a以分别避让第一转接片41、第二转接片42,从而能够不影响第一转接片41、第二转接片42在绝缘件22上的设置。同时,第一缺口221a、第二缺口223a的边角均设置有倒角,一方面便于第一缺口221a、第二缺口223a的加工形成,另一方面,由于第一缺口221a、第二缺口223a靠近第一转接片41、第二转接片42设置,而第一转接片41、第二转接片42在绝缘件22上通常设置有粘接件(例如蓝膜、胶带等),因此,倒角的设计能够避免第一缺口221a、第二缺口223a的边角为尖角而导致刺破粘接件的情况,确保粘接件能够对第一转接片41、第二转接片42在绝缘件22上的连接可靠性起到帮助。
此外,第一缺口221a、第二缺口223a的边角处为倒角的设计还能够对电解液的回流提供导向作用,使得电解液能够更快浸润电芯。
一些实施例中,为了实现绝缘片32与绝缘件22的更紧密连接,周缘面220的位于该第一热熔连接部221的部分,和周缘面220的位于该第二热熔连接部223的部分中至少一者包括沿绝缘件22的宽度方向相背设置的第一侧面220a和第二侧面220b,以及位于绝缘件22的长度方向上的一端并连接于第一侧面220a、第二侧面220b之间的端面220c。其中,绝缘片32与第一侧面220a、第二侧面220b以及端面220c热熔连接,以使绝缘片32与第一侧面220a、第二侧面220b以及端面220c的连接处分别形成热熔连接区220d,从而绝缘片32与热熔连接部之间形成多个热熔连接区220d,能够提高绝缘片32与热熔连接部的热熔可靠性。
一种可选地,该第一侧面220a、第二侧面220b上的热熔连接区220d的数量大于端面220c上的热熔连接区220d的数量。示例性的,该第一侧面220a、第二侧面220b上的热熔连接区220d的数量可分别为至少三个,而该端面220c上的热熔连接区220d的数量则可为至少一个。
另一种可选地,由于第一侧面220a、第二侧面220b上的热熔连接区220d的数量多于端面220c上的热熔连接区220d的数量,基于此,考虑到热熔连接区220d通常也为长条片状,因此,第一侧面220a、第二侧面220b上的热熔连接区220d的长度可小于或等于端面220c上的热熔连接区220d的长度,从而在确保足够的热熔面积的同时,缩小热熔连接区220d的长度。
或者,再一种可选地,该第一侧面220a、第二侧面220b上的各个热熔连接区220d的面积之和可大于端面220c上的各热熔连接区220d的面积之和,这样,确保绝缘片32在裸电芯31的长度方向上具有足够的热熔面积,防止在长久使用后脱落的情况。
可选地,由于端面220c为沿绝缘件22的长度方向上的一端表面,因此,位于端面220c上的热熔连接区220d的长度可大于1/4顶盖本体21的自身宽度,从而在有效控制端面220c上的热熔连接区220d的数量,降低热熔工艺的难度时,也能够确保端面220c上的热熔连接区220d具有足够的热熔面积。
进一步地,为了增大端面220c的可热熔面积,该第二表面22a的位于第一热熔连接部221和第二表面22a的位于第二热熔连接部223的部分中的至少一者设有凸条2200,凸条的一侧面邻接于端面220c,凸条2200的一侧面的至少一部分与绝缘片32热熔连接。由于该凸条2200可自第二表面22a的背离第一表面210的方向凸出,从而该凸条2200也形成为热熔连接部的一部分,从而能够进一步增高大第一热熔连接部221和第二热熔连接部223与绝缘片32的热熔面积,进一步提高绝缘片32与绝缘件22的热熔连接的可靠性。
可选地,沿垂直于第一表面210的方向上,热熔连接区220d的边缘至第一表面210的距离可为1mm-2mm。即,该热熔连接区220d的最靠近顶盖本体21的第一表面210的边缘至该第一表面210的距离可为1mm-2mm。这是由于热熔时需要通过热熔设备的热熔头进行热熔操作,因此,限定热熔连接区220d的边缘至第一表面210的距离,一方面能够预留出操作空间供热熔头伸入,另一方面能够避免热熔后形成的热熔连接区220d与顶盖本体21接触或者是热熔连接区220d延伸至顶盖本体21上,导致顶盖本体21不平整,影响顶盖本体21与壳体10的密封连接,尤其是顶盖本体21与壳体10采用焊接时,若热熔连接区220d延伸至顶盖本体21,将导致顶盖本体21与壳体10的焊接处不平整无法满焊,进而导致顶盖本体21与壳体10出现焊接不良影响密封连接的情况。
示例性的,该热熔连接区220d的边缘至第一表面210的距离可为1.2mm、1.5mm、1.8mm、2mm等,具体可根据实际情况设置,本实施例对此不作具体限定。
结合图7至图8所示,一些实施例中,由前述可知,储能装置100可为方形储能装置100,则裸电芯31可为方形裸电芯31,该裸电芯31可包括一个或多个,当该裸电芯31包括多个时,多个裸电芯31的排布方向可为沿着裸电芯31自身宽度方向排列,相邻的两个裸电芯31之间可通过粘接件,例如胶带、蓝膜等连接。从而,可根据实际情况设置裸电芯31的数量,使得储能装置100的适用范围更广。
进一步地,该裸电芯31具有本体部31c,本体部31c可包括底端面311、连接于底端面311的两个第一外侧面312以及两个第二外侧面313,其中,两个第一外侧面312、两个第二外侧面313构成了裸电芯31的周面。该两个第一外侧面312相对设置,两个第二外侧面313相对设置,且各个第二外侧面313连接于两个第一外侧面312之间。即,第一外侧面312为沿裸电芯31的宽度方向上的表面,而第二外侧面313则为沿裸电芯31的长度方向上的表面,从而第一外侧面312的表面积大于第二外侧面313的表面积。
值得说明的是,该裸电芯31还包括顶端面314,该顶端面314朝向顶盖组件20设置,并靠近该绝缘件22。顶端面314上可设置有上述的第一极耳31a、第二极耳31b。
可以理解的是,上述的裸电芯31的本体部31c大致可为方形块体,其长度方向的尺寸为L1,宽度方向的尺寸为W1,高度方向的尺寸为H1,裸电芯31整体上可大致形成长×宽×高为L1×W1×H1的长方体结构,将裸电芯31设计为简单、规则的立体形状,有助于后续对裸电芯31的包装、保护等,简化储能装置100的整体结构设计。
进一步地,该绝缘片32可以包覆于裸电芯31的本体部31c的周面,或包覆于裸电芯31的本体部31c的底端面311,或者同时包覆于裸电芯31的本体部31c的周面和底端面311,以提高绝缘片32的绝缘保护作用。
结合图9a所示,可选地,该绝缘片32可同时对裸电芯31的本体部31c的周面以及底端面311均进行包覆,以实现对裸电芯31的绝缘保护。具体地,该绝缘片32包括底部包覆区32a以及周向包覆区32b,底部包覆区32a包覆于裸电芯31的本体部31c的底端面311,周向包覆区32b则包覆于裸电芯31的本体部31c的周面。通过将绝缘片32分为底部包覆区32a和周向包覆区32b以覆盖裸电芯31的不同部位,从而能够实现对裸电芯31的包覆保护。同时,设置周向包覆区32b包括主包覆部分和折叠部分,从而能够用于包覆裸电芯31的不同表面,使得绝缘片包覆于裸电芯时的包覆更加方便、快捷。此外,绝缘片32通过周向包覆区和底部包覆区32a实现对裸电芯31除裸电芯31的顶端面314的全面包覆,以提高绝缘片32的绝缘保护作用。
进一步地,由前述可知,裸电芯31的本体部31c的周面包括两个第一外侧面312和两个第二外侧面313,则该周向包覆区32b可包括两个主包覆部分(该两个主包覆部分下文可分别标记为第一包覆区321和第二包覆区322)和连接于主包覆部分的折叠部分(即下文提及的侧翼),该第一包覆区321和第二包覆区322分别连接于底部包覆区32a的两侧,第一包覆区321和第二包覆区322分别用于覆盖两个第一外侧面312,折叠部分则用于覆盖第二外侧面313。从而,第一包覆区321和第二包覆区322分别热熔连接于第一侧面220a、第二侧面220b,折叠部分则热熔连接于端面220c。这样,有利于提高绝缘片32包覆于裸电芯31的便捷性。
一种示例中,如图9a所示,第一包覆区321的两侧分别设有第一侧翼321a和第二侧翼321b,第一侧翼321a与第二侧翼321b的形状尺寸相同,第二包覆区322的两侧分别设有第三侧翼322a和第四侧翼322b,第三侧翼322a与第四侧翼322b的形状尺寸相同,当绝缘片32形成包覆于裸电芯31的腔体时,第一侧翼321a和第二侧翼321b分别向裸电芯31的第二外侧面313折叠,第三侧翼322a和第四侧翼322b也朝向裸电芯31的第二外侧面313折叠,使得第一侧翼321a与第三侧翼322a连接,第二侧翼321b与第四侧翼322b连接,以通过第一侧翼321a、第二侧翼321b、第三侧翼322a、第四侧翼322b实现对裸电芯31的第二外侧面313的包覆。
其中,在第一侧翼321a、第二侧翼321b上设有防呆部3210,该防呆部3210可为形成于该第一侧翼321a、第二侧翼321b的边角上的倒角,例如可为倒斜角或倒圆角,从而通过该防呆部3210的设计,能够便于在包覆时快速辨别包覆的方向。
进一步地,当通过侧翼对裸电芯31的第二外侧面313进行包覆时,如图9a中的绝缘片32的结构形式,第一侧翼321a与第三侧翼322a的连接形式可以为第一侧翼321a的边缘与第三侧翼322a的边缘刚好拼接,并完全覆盖裸电芯31的第二外侧面313,此时可以在绝缘片32面积最小的情况下实现对裸电芯31的全面覆盖,以减少绝缘片32材料的消耗,节约储能装置100的制造成本。
另一种示例中,如图9b所示,第一侧翼321a与第三侧翼322a的连接形式可以为第一侧翼321a与第三侧翼322a至少部分重叠,即第一侧翼321a的边缘可以搭接于第三侧翼322a上,此时由于第一侧翼321a和第三侧翼322a之间具有重叠部分,可以使得第一侧翼321a与第三侧翼322a的连接部分更加紧密,同时重叠连接可以加厚连接部分的材料厚度,可以进一步加强连接部位的结构强度,可以有效防止绝缘片32发生破损的情况。
可以理解的是,无论是第一侧翼321a与第三侧翼322a为边缘恰好连接形式,亦或是第一侧翼321a与第三侧翼322a部分重叠的连接形式,第一侧翼321a与第三侧翼322a的尺寸可以相同也可以是不同的,只要可以实现上述连接形式即可,本实施例中对第一侧翼321a与第三侧翼322a之间的相对尺寸的大小不作具体限定。
由于第二侧翼321b与第一侧翼321a的结构尺寸相同,第三侧翼322a与第四侧翼322b的结构尺寸相同,因此第二侧翼321b与第四侧翼322b的连接形式可参考上述第一侧翼321a与第三侧翼322a的连接形式,此处不再赘述。
上述方案中,提供了第一侧翼321a与第二侧翼321b的尺寸形状相同、第三侧翼322a与第四侧翼 322b的尺寸相同的案例,考虑到裸电芯31的结构大致为方形块体结构,当第一侧翼321a与第二侧翼321b的尺寸不同,第三侧翼322a与第四侧翼322b的尺寸不同时,只要可以实现对裸电芯31的全面包覆即可,此处不对第一侧翼321a与第二侧翼321b的尺寸关系以及第三侧翼322a与第四侧翼322b的尺寸关系作具体限定。
进一步地,如图9a和图9b中的绝缘片32的结构形式,在第一侧翼321a与第一包覆区321之间设置有第一弯折区321c,在第二侧翼321b与第一包覆区321之间设置有第二弯折区321d,在第三侧翼322a与第二包覆区322之间设置有第三弯折区322c,在第四侧翼322b与第二包覆区322之间设置有第四弯折区322d。第一弯折区321c、第二弯折区321d、第三弯折区322c以及第四弯折区322d在绝缘片32形成包覆于裸电芯31的腔体时,可以形成周向包覆区的四个圆角,即通过上述各弯折区的设置可以使得侧翼相对于包覆区进行弯折时可以更容易弯折,使绝缘片32更容易形成包覆腔体。
弯折区的形成可以通过在绝缘片32上印刻压痕形成,每两条压痕之间可以形成一个弯折区,通过印刻压痕的方式可以使得绝缘片32在压痕位置更容易弯折,以更容易使得绝缘片32形成包覆腔体。
可以理解的是,弯折区也可以在绝缘片32成型时通过一体成型制成,或者通过其他方式形成,即在本实施例中不作具体限定。
另一种示例中,如图9c中的绝缘片32的结构形式,第一包覆区321和第二包覆区322的一侧均设有侧翼,第一包覆区321和第二包覆区322包覆于裸电芯31的第一外侧面312,侧翼包覆于裸电芯31的第二外侧面313。具体地,第一包覆区321的一侧设有第一侧翼321a,第二包覆区322的相对于第一侧翼321a的另一侧设有第三侧翼322a,当绝缘片32形成包覆于裸电芯31的腔体时,第一侧翼321a向裸电芯31的第二外侧面313折叠,第三侧翼322a也朝向裸电芯31的第二外侧面313折叠,使得第一侧翼321a与第二包覆区322的未设置侧翼的一侧连接,第三侧翼322a与第一包覆区321未设置侧翼的一侧连接,以通过第一侧翼321a、第三侧翼322a实现对裸电芯31的第二外侧面313的包覆。
进一步地,当通过侧翼对裸电芯31的第二外侧面313进行包覆时,如图9c中的绝缘片32的结构形式,第一侧翼321a与第二包覆区322的未设置侧翼的一侧的连接形式可以为第一侧翼321a的边缘与第二包覆区322的未设置侧翼的一侧边缘刚好拼接,并完全覆盖裸电芯31的第二外侧面313,此时可以在绝缘片32面积最小的情况下实现对裸电芯31的全面覆盖,以减少绝缘片32材料的消耗,节约储能装置100的制造成本。
亦或者如图9d中的绝缘片32的结构形式,第一侧翼321a与第二包覆区322的未设置侧翼的一侧的连接形式可以为第一侧翼321a与第二包覆区322的未设置侧翼的一侧至少部分重叠,即第一侧翼321a的边缘可以搭接于第二包覆区322上,此时由于第一侧翼321a和第二包覆区322之间具有重叠部分,可以使得第一侧翼321a与第二包覆区322的连接部分更加紧密,同时重叠连接可以加厚连接部分的材料厚度,可以进一步加强连接部位的结构强度,可以有效防止绝缘片32发生破损的情况。
由于裸电芯31的两个第二外侧面313的结构尺寸相同,因此第三侧翼322a与第一包覆区321的连接形式可参考上述第一侧翼321a与第二包覆区322的连接形式,此处不再赘述。
请再次参阅图9c中的绝缘片32的结构形式,当第一侧翼321a与第二包覆区322的未设置侧翼的一侧的连接形式可以为第一侧翼321a的边缘与第二包覆区322的未设置侧翼的一侧边缘刚好拼接时,在第一侧翼321a与第一包覆区321之间设置有第一弯折区321c,在第三侧翼322a与第二包覆区322之间设置有第三弯折区322c。第一弯折区321c和第三弯折区322c在绝缘片32形成包覆于裸电芯31的腔体时,可以形成周向包覆区的两个圆角,即通过上述各弯折区的设置可以使得侧翼相对于包覆区进行弯折时可以更容易弯折,使绝缘片32更容易形成包覆腔体。
请参阅图9d中的绝缘片32的结构形式,当第一侧翼321a与第二包覆区322的未设置侧翼的一侧的连接形式可以为第一侧翼321a与第二包覆区322的未设置侧翼的一侧至少部分重叠时,在第一侧翼 321a与第一包覆区321之间设置有第一弯折区321c,在第一侧翼321a与第二包覆区322的重叠部分设置有第二弯折区321d,在第三侧翼322a与第二包覆区322之间设置有第三弯折区322c,在第三侧翼322a与第一包覆区321的重叠部分设置有第四弯折区322d。第一弯折区321c、第二弯折区321d、第三弯折区322c以及第四弯折区322d在绝缘片32形成包覆于裸电芯31的腔体时,可以形成周向包覆区的四个圆角,即通过上述各弯折区的设置可以使得侧翼相对于包覆区进行弯折时可以更容易弯折,使绝缘片32更容易形成包覆腔体。
又一种示例中,如图9e中的绝缘片32的结构形式,第一包覆区321的两侧均设有侧翼,第二包覆区322的两侧未设置侧翼,第一包覆区321和第二包覆区322包覆于裸电芯31的第一外侧面312,侧翼包覆于裸电芯31的第二外侧面313。具体地,即第一包覆区321的两侧分别设有第一侧翼321a和第二侧翼321b,当绝缘片32形成包覆于裸电芯31的腔体时,第一侧翼321a向裸电芯31的第二外侧面313折叠,第二侧翼321b也朝向裸电芯31的第二外侧面313折叠,使得第一侧翼321a与第二包覆区322连接,第二侧翼321b与第二包覆区322连接,以通过第一侧翼321a、第二侧翼321b实现对裸电芯31的第二外侧面313的包覆。
进一步地,如图9e中的绝缘片32的结构形式,当通过侧翼对裸电芯31的第二外侧面313进行包覆时,第一侧翼321a与第二包覆区322的连接形式可以为第一侧翼321a的边缘与第二包覆区322的未设置侧翼的一侧边缘刚好拼接,并完全覆盖裸电芯31的第二外侧面313,此时可以在绝缘片32面积最小的情况下实现对裸电芯31的全面覆盖,以减少绝缘片32材料的消耗,节约储能装置100的制造成本。
亦或者如图9f中的绝缘片32的结构形式,第一侧翼321a与第二包覆区322的连接形式可以为第一侧翼321a与第二包覆区322的未设置侧翼的一侧至少部分重叠,即第一侧翼321a的边缘可以搭接于第二包覆区322上,此时由于第一侧翼321a和第二包覆区322之间具有重叠部分,可以使得第一侧翼321a与第二包覆区322的连接部分更加紧密,同时重叠连接可以加厚连接部分的材料厚度,可以进一步加强连接部位的结构强度,可以有效防止绝缘片32发生破损的情况。
由于裸电芯31的两个第二外侧面313的结构尺寸相同,因此第二侧翼321b与第二包覆区322的连接形式可参考上述第一侧翼321a与第二包覆区322的连接形式,此处不再赘述。
请再次参阅图9e中的绝缘片32的结构形式,当第一侧翼321a与第二包覆区322的连接形式可以为第一侧翼321a的边缘与第二包覆区322的边缘刚好拼接时,在第一侧翼321a与第一包覆区321之间设置有第一弯折区321c,在第二侧翼321b与第一包覆区321之间设置有第二弯折区321d。第一弯折区321c和第二弯折区321d在绝缘片32形成包覆于裸电芯31的腔体时,可以形成周向包覆区的两个圆角,即通过上述各弯折区的设置可以使得侧翼相对于包覆区进行弯折时可以更容易弯折,使绝缘片32更容易形成包覆腔体。
请参阅图9f中的绝缘片32的结构形式,当第一侧翼321a与第二包覆区322的连接形式可以为第一侧翼321a与第二包覆区322的未设置侧翼的一侧至少部分重叠时,在第一侧翼321a与第一包覆区321之间设置有第一弯折区321c,在第一侧翼321a与第二包覆区322的重叠部分设置有第二弯折区321d,在第二侧翼321b与第一包覆区321之间设置有第三弯折区322c,在第二侧翼321b与第二包覆区322的重叠部分设置有第四弯折区322d。第一弯折区321c、第二弯折区321d、第三弯折区322c以及第四弯折区322d在绝缘片32形成包覆于裸电芯31的腔体时,可以形成周向包覆区的四个圆角,即通过上述各弯折区的设置可以使得侧翼相对于其所在的包覆区进行弯折时可以更容易弯折,使绝缘片32更容易形成包覆腔体。
为了实现绝缘片32对裸电芯31的全面包覆,现以上述第一种绝缘片32的结构,即如图9a中所示的绝缘片32的结构为例,结合图7中的裸电芯31的尺寸情况,绝缘片32各个部分的尺寸与裸电芯31之间的尺寸关系应满足:
第一包覆区321的长度X1应不小于裸电芯31的高度H1,第一包覆区321的宽度Y1应不小于裸电芯31的长度L1,第一侧翼321a的宽度Y2应不小于裸电芯31宽度W1的一半,第二包覆区322的宽度Y3应不小于裸电芯31的宽度W1,即:X1≥H1;Y1≥L1;Y2≥1/2W1;Y3≥W1。
同时为了实现绝缘片32对裸电芯31包覆的紧密性,节省空间,绝缘片32与裸电芯31之间的尺寸关系还应满足:X1≤H1+5mm;Y1≤L1+5mm;Y2≤W1;Y3≤W1+5mm。
即第一包覆区321的长度X1可以为H1、H1+0.1mm、H1+0.2mm、H1+0.5mm、H1+1mm、H1+2mm、H1+5mm;第一包覆区321的宽度Y1可以为L1、L1+0.1mm、L1+0.2mm、L1+0.5mm、L1+1mm、L1+2mm、L1+5mm;第一侧翼321a的宽度Y2可以为1/2W1、2/3W1、3/4W1、W1;第二包覆区322的宽度Y3可以为W1、W1+0.1mm、W1+0.2mm、W1+0.5mm、W1+1mm、W1+2mm、W1+5mm。
可以理解的是,上述绝缘片32的尺寸只是一些示例,在实际设计过程中,只要绝缘片32的尺寸与裸电芯31的尺寸满足上述关系式时均可,在本实施例中不作具体限定。
可选地,储能装置100还包括粘接件50,粘接件50可用于粘接于绝缘片32的两个连接部分,以使得绝缘片32围合连接以形成用于包覆该裸电芯31的腔体,且此时该粘接件50位于腔体外。这样,利用粘接件50的设置,可实现将周向包覆区和底部包覆区32a连接起来,从而不仅使得绝缘片32可有效包覆该裸电芯31,而且还可便于后续对储能装置100内部裸电芯31进行检修时,将绝缘片32拆解下来。
例如,可选地,由于两个主包覆部分(即第一包覆区321、第二包覆区322)分别覆盖两个第一外侧面312,因此,该第一包覆区321、第二包覆区322与底部包覆区32a之间可连接有粘接件50。即,粘接件50的一端连接于主包覆部分(例如连接于第一包覆区321、第二包覆区322),另一端连接于该底部包覆区32a。和/或,在折叠部分(即侧翼)与主包覆部分之间连接有粘接件50,即,粘接件50的一端连接于折叠部分(即侧翼),另一端连接于主包覆部分(例如第一包覆区321、第二包覆区322)和/或,如上述9a中的结构所述,位于两个主包覆部分的同一侧的两个折叠部分之间连接有粘接件50。上述各设置均能够提高绝缘片32包覆于裸电芯31的外部时的包覆可靠性,防止绝缘片32自裸电芯31外部散落。
示例性的,上述的粘接件50均可包括胶带或者是蓝膜,具体可根据实际情况选择,本实施例对此不作具体限定。
以粘接件50为胶带为例,胶带可以粘贴于绝缘片32的第一侧翼321a与第三侧翼322a的连接部分、第二侧翼321b与第四侧翼322b的连接部分。通过将胶带粘贴于上述位置,可以实现对绝缘片32的固定,以及对绝缘片32的薄弱位置的加强。可以理解的是,本实施例中只给出了一种胶带的粘贴位置,其具体的粘贴位置,可以根据实际情况进行调整,在本实施例中不作具体限定。
进一步地,在绝缘片32与裸电芯31之间未设置胶层,即,该绝缘片32的位于腔体内部的一侧表面并未设置胶层,则绝缘片32与裸电芯31之间主要通过上述的胶带实现固定。如果绝缘片32的腔体相对于裸电芯31的固定,采用胶层固定,即在绝缘片32的位于腔体内部的一侧表面设置胶层,再将绝缘片32贴于胶层上,则在后续对裸电芯31的检修的过程中,绝缘片32不容易被拆解下来,同时也会在裸电芯31表面留有残胶,影响后续新绝缘片32的安装。此外,在裸电芯31的外表面取消胶层的设置,可以避免由于胶层的存在,导致裸电芯31的热量无法散发的情况,即,取消胶层的设置,可以提高裸电芯31的散热性能。另外,胶层的取消使得裸电芯31与绝缘片32之间存在一定的间隔空间,此时可以扩大电解液的循环流动的空间,提高电解液的浸润程度。
请再次参阅图2、图3,一些实施例中,由于绝缘片32要热熔连接于第一侧面220a、第二侧面220b和端面220c,基于此,该第一包覆区321、第二包覆区322可分别热熔连接于第一侧面220a、第二侧面220b,而连接于同一个第二外侧面313的两个折叠部分(例如第一侧翼321a、第三侧翼322a)则可热熔连接于端面220c上的同一个热熔连接区220d。从而,在具有足够的热熔面积以提高热熔可靠 性的同时,还可以减少热熔连接区220d的设置,进而减少热熔工序。
进一步地,由前述可知,第一侧翼321a、第三侧翼322a在第二外侧面313上至少部分重合,而该同一个热熔连接区220d可完全位于该第一侧翼321a、第三侧翼322a的重合区域内。一方面,第一侧翼321a、第三侧翼322a至少部分重合能够使得第一侧翼321a、第三侧翼322a的连接更加紧密,同时重叠连接可以增大第一侧翼321a、第三侧翼322a的连接处的材料厚度,从而增大第一侧翼321a、第三侧翼322a的连接处的结构强度,防止绝缘片32发生破损。另一方面,该同一个热熔连接区完全位于第一侧翼321a、第三侧翼322a的重合区域内,由于重合区域的材料厚度较大,能够增大热熔面积,从而提高热熔可靠性,进而可以减少热熔连接区220d的数量。
相应地,第二侧翼321b、第四侧翼322b可至少部分重合设置,且同样热熔于端面220c上的同一个热熔连接区220d,且该同一个热熔连接区220d同样可完全位于第二侧翼321b、第四侧翼322b的重合区域内。
进一步地,折叠部分(即任一侧翼)与该折叠部分所覆盖的第二外侧面313之间形成有导液流道322e,所述导液流道322e用于供电解液流过。即,为了实现电解液在绝缘片32和裸电芯31之间循环流动,以提高电解液的浸润效果,在绝缘片32上设有导液流道322e,进而为电解液提供在壳体10内部的循环通道。具体地,由前述可知,绝缘片32围合形成用于包裹裸电芯31的腔体主要是通过上述的周向包覆区32b和底部包覆区32a通过胶带粘合形成,因此,该导液流道322e可为形成各个包覆区连接处的间隙,例如第一侧翼321a与第三侧翼322a的连接处、第二侧翼321b与第四侧翼322b的连接处,第一侧翼321a与底部包覆区32a之间的连接间隙、第三侧翼322a与底部包覆区32a之间的连接间隙等。
可以理解的是,在其他实施例中,导液流道322e还可由直接在绝缘片32的周向包覆区32b的任意位置处开孔形成,例如在第一包覆区321、第一侧翼321a、第二侧翼321b、第二包覆区322、第三侧翼322a、以及第四侧翼322b上开设通孔。同样能够实现电解液在裸电芯31与绝缘片32之间的空间和绝缘片32与壳体10之间的空间进行循环流动,以提高电解液的浸润效率。
可见,只要能够实现电解液的循环流动,对于导液流道322e的形成方式,在本实施例中不作具体限定。
一些实施例中,该储能装置100还包括隔离件60,隔离件60可设置在绝缘片32的底部包覆区32a,利用隔离件60一方面能够承托底部包覆区32a,加强底部包覆区32a的厚度,防止底部包覆区32a出现破损。另一方面,在壳体10受到外界冲击时,可以利用隔离件60对来自壳体10的冲击进行缓冲、减震,减小冲击对裸电芯31的冲击作用,以更好地保护裸电芯31,防止裸电芯31在受冲击时发生活性物质脱落进而发生内部短路的情况。
由于在壳体10的加工过程中,会将壳体10的底面的边角设计为圆角,当将裸电芯31直接放置于壳体10的容纳腔10a中时,若裸电芯31与壳体10直接接触,在壳体10的圆角位置,裸电芯31与圆角之间的接触为线接触,此时会导致裸电芯31的与壳体10圆角接触的部分承受较大的压力,进而导致裸电芯31内部的活性物质脱落,使得裸电芯31内部的正极片和负极片之间发生短路,使得裸电芯31无法实现正常充电、放电的功能,导致储能装置100电性失效,甚至会发生危险。
基于此,本申请将裸电芯31的底端面311与壳体10的底面之间通过设置隔离件60而进行间隔设置。通过将裸电芯31的底端面311与壳体10的底面间隔设置,可以实现裸电芯31的底端面311与壳体10底面的圆角间隔开,有效防止裸电芯31会与壳体10的圆角发生碰撞,避免裸电芯31内部的活性物质掉落,使得裸电芯31发生短路的情况。
请再次参阅图2以及参阅图10至图12,一种可选的实施方式中,隔离件60可一体成型于绝缘片32,并作为绝缘片32的底部包覆区32a,该底部包覆区32a包覆于裸电芯31的本体部31c的底端面311。当将隔离件60与绝缘片32一体成型时,可以提高绝缘片32与隔离件60的连接强度,同时,将 隔离件60与绝缘片32一体成型,可以减小裸电芯31的底端面311与壳体10的底面之间的距离,可以进一步缩小壳体10的内部空间,提高储能装置100的能量密度。
在此实施方式中,隔离件60平行于裸电芯31的底端面311设置,以实现对裸电芯31的稳定承载作用,同时,为了实现对裸电芯31的绝缘保护,该隔离件60为绝缘材料。考虑到储能装置100的壳体10的内部空间有限,且为了进一步提高储能装置100的壳体10的内部空间的利用效率,隔离件60为片状结构,以实现隔离件60在对裸电芯31进行承载的同时减小其对壳体10的内部空间的占用率,进而提高储能装置100的能量密度。
进一步地,考虑到隔离件60对裸电芯31的底端面311与壳体10底面的隔离作用,隔离件60的厚度H为0.1mm至2mm,即隔离件60的厚度H可以为0.1mm、0.2mm、0.5mm、1mm、1.5mm、2mm等,同时由于壳体10底面的圆角具有一定的尺寸,当裸电芯31的底端面311与壳体10底面之间的间隔小于0.1mm时,裸电芯31与壳体10底面的圆角之间必然发生干涉,导致裸电芯31内部的活性物质掉落的可能性极大,会严重影响裸电芯31的电性能稳定性。当裸电芯31的底端面311与壳体10底面之间的距离大于2mm时,会使得电芯组件30占用壳体10容纳腔10a空间较大,导致储能装置100的整体尺寸变大,影响储能装置100的结构设计,并使得储能装置100的能量密度下降。
可选地,如图12所示,隔离件60至少一个表面突设有凸起结构60a,即隔离件60具有相对的第一面61和第二面62,第一面61为隔离件60朝向裸电芯31一侧的表面,第二面62为隔离件60的朝向壳体10的一侧的表面。一种示例性的,在第一面61设置有凸出于第一面61的凸起结构60a,通过在隔离件60的第一面61设置凸起结构60a,可以提高隔离件60与裸电芯31之间的摩擦力,使得裸电芯31在隔离件60上的固定更加稳定,而不会轻易滑动,进而可以防止裸电芯31与壳体10之间发生碰撞的情况。另一种示例性的,在第二面62设置有凸出于第二面62的凸起结构60a,通过在隔离件60的第二面62设置凸起结构60a,可以提高隔离件60与底面之间的摩擦力,使得隔离件60在底面上的固定更加稳定,而不会轻易滑动,进而可以防止裸电芯31与壳体10之间发生碰撞的情况。再一种示例性的,在第一面61和第二面62同时设置有分别凸出于第一面61和第二面62的凸起结构60a。通过在隔离件60的至少一个表面设置凸起结构60a,可以提高隔离件60与裸电芯31以及壳体10的底面之间的固定稳定性,防止裸电芯31与壳体10之间发生碰撞的情况。
此外,在隔离件60至少一个面突设有凸起结构60a,可以降低隔离件60的加工制造难度,当隔离件60的表面过于光滑时,重叠放置的两个隔离件60之间容易发生粘连的现象,不容易分离,导致隔离件60在加工过程中需要消耗较长时间进行个体分离,严重影响生产效率。
具体地,凸起结构60a可以为凸台、凸块、凸条等其他可以实现凸出于隔离件60的表面的结构,在本实施例中不作具体限定。
如图10至图12所示,另一种可选的实施方式中,隔离件60与绝缘片32为分体设置,且隔离件60设置于绝缘片32的底部包覆区32a的背离本体部31c的一侧面。当将隔离件60与绝缘片32为分体设置时,绝缘片32即可设计为整体厚度相同的片状结构,此时可以降低隔离件60和绝缘片32的制造难度,即分体设置,可以实现对隔离件60和绝缘片32分别生产,可以有效提高绝缘片32与隔离件60的生产效率。此外,分体设置可以对隔离件60和绝缘片32的结构进行分别设计,进一步减小了为一体成型结构时需要考虑的结构设计的难度。
进一步地,为了实现隔离件60对裸电芯31的承载稳定性,隔离件60与绝缘片32的底部包覆区32a的背离本体部31c的一侧面平行设置,以实现隔离件60、绝缘片32以及裸电芯31的固定稳定性,防止裸电芯31以及绝缘片32从隔离件60上滑落;通过平行设置,可以使得隔离件60受力更加均匀,防止隔离件60受力不均,发生断裂、损坏,进而影响储能装置100的使用寿命的情况。
当隔离件60与绝缘片32为分体设置时,绝缘片32的底部包覆区32a的厚度与隔离件60的厚度之和H为0.1mm至2mm,即绝缘片32的底部包覆区32a的厚度与隔离件60的厚度之和H可以为 0.1mm、0.2mm、0.5mm、1mm、1.5mm、2mm等,同时由于壳体10底面的圆角具有一定的尺寸,当裸电芯31的底端面311与壳体10底面之间的间隔小于0.1mm时,裸电芯31与壳体10底面的圆角之间必然发生干涉,使得裸电芯31内部的活性物质掉落的可能性极大,会严重影响裸电芯31的电性能稳定性。当裸电芯31的底端面311与壳体10底面之间的距离大于2mm时,会使得电芯组件30占用壳体10容纳腔10a空间较大,导致储能装置100的整体尺寸变大,影响储能装置100的结构设计,并使得储能装置100的能量密度下降。
进一步地,考虑到隔离件60需要对裸电芯31进行承托,而绝缘片32仅需要实现对裸电芯31的绝缘保护,从隔离件60和绝缘片32的受力特点对其结构强度的影响,隔离件60的厚度可以大于或等于绝缘片32的厚度,或者隔离件60的厚度为绝缘片32的厚度的二倍,亦或者隔离件60的厚度可以为绝缘片32的厚度的三倍等,以使得隔离件60在受到来自外界的冲击时,能够对裸电芯31起到更好地承托作用,以实现隔离件60的对裸电芯31的缓冲、减震效果。
具体地,绝缘片32的厚度可以为0.1mm-1mm,当绝缘片32的厚度过小时,绝缘片32的强度无法保证,容易被损坏;当绝缘片32的厚度过大时,无法实现二次储能装置100的轻便性,同时会需要壳体10具有较大的容纳腔10a以实现对裸电芯31和绝缘片32的容纳,进而导致二次储能装置100的尺寸更大的情况。
隔离件60的厚度可以为0.1mm-2mm,当隔离件60的厚度过小时,隔离件60的承载强度无法保证,容易被损坏;当隔离件60的厚度过大时,无法实现二次储能装置100的轻便性,同时较厚的隔离件60需要壳体10具有较大的容纳腔10a以实现对隔离件60的容纳,进而导致二次储能装置100的尺寸更大。
综合考虑上述隔离件60与绝缘片32的厚度关系以及隔离件60与绝缘片32的厚度范围的条件,绝缘片32和隔离件60的厚度关系示例如下:
当绝缘片32的厚度为0.15mm时,隔离件60的厚度可以为0.30mm或0.45mm等;当绝缘片32的厚度为0.5mm时,隔离件60的厚度可以为1.0mm或1.5mm等;当绝缘片32的厚度为1.0mm时,隔离件60的厚度可以为2.0mm绝缘片32隔离件60。
可以理解的是,上述的隔离件60与绝缘片32的厚度,仅为一些示例,在实际应用中,只要绝缘片32与隔离件60的厚度同时满足上述的厚度范围即可,其具体厚度值在本实施例中不作具体限定。
具体地,当隔离件60与绝缘片32分体设置时,隔离件60连接于绝缘片32的底部包覆区32a的背离裸电芯31的一侧,通过在裸电芯31与壳体10的底面之间设置隔离件60,利用隔离件60对裸电芯31进行承托。当壳体10受到外界冲击时,可以利用隔离件60对来自壳体10的冲击进行缓冲、减震,减小外界冲击对裸电芯31的冲击作用,以更好地保护裸电芯31,防止裸电芯31在受冲击时发生活性物质脱落,而发生内部短路的情况。
由于储能装置100内部的结构要对裸电芯31起到绝缘保护作用,绝缘片32和隔离件60均为绝缘材料,并采用热塑工艺制成,采用热塑工艺制成的绝缘片32和隔离件60的韧性高、耐冲击性能好。示例性的,绝缘片32和隔离件60通常为高分子绝缘材料,例如隔离件60可以为聚丙烯、聚乙烯等,绝缘片32可以为聚丙烯、聚乙烯等。
进一步地,当绝缘片32与隔离件60之间的连接失效时,隔离件60会与绝缘片32发生相对移动,此时绝缘片32会受到来自隔离件60的摩擦力,导致绝缘片32发生摩擦损坏,而不能对裸电芯31起到良好的绝缘保护作用。因此,为了实现隔离件60与绝缘片32之间的稳定连接,绝缘片32与隔离件60之间可采用热熔连接,隔离件60与绝缘片32连接的表面为第一面61,第一面61具有第一热熔连接位置61a,绝缘片32的底部包覆区32a具有第二热熔连接位置3200,隔离件60与绝缘片32在热熔时,可将第一热熔连接位置61a和第二热熔连接位置3200进行热熔连接,以实现绝缘片32与隔离件60的稳定连接,进而实现绝缘片32对裸电芯31的良好的绝缘保护。
进一步地,为了进一步提高隔离件60与绝缘片32之间的热熔连接的连接稳定性,将隔离件60与绝缘片32选择为相同的材料。当隔离件60与绝缘片32为相同的高分子材料时,隔离件60与绝缘片32之间的分子结构相同,二者在热熔时能够具有较强的键合力,可以使得隔离件60与绝缘片32之间的连接更加稳定,进一步防止发生隔离件60与绝缘片32之间发生相对移动,进而损坏绝缘片32的情况以及导致储能装置100性能稳定性下降,甚至无法使用的情况。
可选地,隔离件60与绝缘片32均为聚丙烯材料,由于聚丙烯材料为高分子的绝缘材料,隔离件60与绝缘片32选用该材料可以实现对裸电芯31的绝缘保护。且由于聚丙烯材料不可伸缩,易形成为单层膜结构,隔离件60与绝缘片32选为该材料时其承载力更强,不容易被损坏,进而可以提高储能装置100的使用寿命。可以理解的是,在其他实施例中,隔离件60与绝缘片32的材料也可均选用为聚乙烯或其他高分子绝缘材料,其具体材料可以根据实际情况进行选择,本实施例不作具体限定。
请参阅图12,一些实施例中,为了实现隔离件60与绝缘片32之间的连接位置的精准性,可在隔离件60与绝缘片32的底部包覆区32a设置相对应的定位孔进行定位。具体地,可在隔离件60的第一面61(隔离件60与绝缘片32相连接的表面)设置有贯通至底部包覆区32a的透气孔,该透气孔可位于上述的第一热熔连接位置61a、第二热熔连接位置3200的外周。该透气孔不仅能够方便裸电芯31工作时产生的气体排出,同时还能够对隔离件60与底部包覆区32a的连接起到定位作用。
以下将以设置在隔离件60的第一面61上的透气孔为第一定位孔61b,而设置在底部包覆区32a的透气孔为第二定位孔为例进行说明。具体地,隔离件60的第一面61上设置两个间隔排列的第一定位孔61b,两个第一定位孔61b位于隔离件60的两端并且位于同一中心线上。实际设置中,两个第一定位孔61b的中心位于第一面61的沿长度方向(即图12中的X方向)的中轴线上,当将第一定位孔61b设置于第一面61的中轴线上时,可以使得隔离件60的中心与绝缘片32的中心相对,防止绝缘片32以及裸电芯31偏心设置于隔离件60而导致隔离件60的承载受力不均,进而导致隔离件60发生局部变形甚至损坏,无法实现对裸电芯31的缓冲减震作用的情况。此外,还可以便于在隔离件60与绝缘片32连接时起到定位标识作用。
进一步地,两个第一定位孔61b之间的距离应不小于第一面61的沿长度方向的尺寸的一半,即隔离件60的长度的一半,这是由于两个第一定位孔61b之间的距离越大,两个第一定位孔61b所确定的直线误差越小,第一定位孔61b的定位精度越准确,因此两个第一定位孔61b之间的距离应不小于隔离件60的长度的一半。
进一步地,为了保证隔离件60的承载强度,第一定位孔61b的直径应不大于3mm,例如可为1mm、1.5mm、2mm、2.5mm、3mm等。由于该第一定位孔61b的存在,在第一定位孔61b的位置上隔离件60的材料厚度要小于其他未设置开孔结构的材料厚度,使得隔离件60在第一定位孔61b的位置的承载能力下降,因此第一定位孔61b的直径不能过大。
一些实施例中,考虑到隔离件60要与绝缘片32之间进行热熔连接,第一定位孔61b的位置可避开隔离件60的第一热熔连接位置61a,进而可以避免由于第一定位孔61b被第一热熔连接位置61a所遮挡,导致第一定位孔61b不容易识别的情况。
可以理解的是,在其他一些实施例中,第一定位孔61b的位置也可以设置于隔离件60的第一热熔连接位置61a,此时,在将隔离件60与绝缘片32的相对位置确定好后,再进行热熔连接,可以通过热熔连接对第一定位孔61b进行材料填充,以增强隔离件60的承载强度。
相应地,如图12所示,在底部包覆区32a底面上设置有与两个第一定位孔61b的位置、直径大小相同的两个第二定位孔3201,两个第二定位孔3201的中心设置于底部包覆区32a底面的沿长度方向(即图12中的X方向)的中轴线上,以保证绝缘片32可以均匀连接于隔离件60且两个第二定位孔3201之间的距离应与两个第一定位孔61b之间的距离,即当隔离件60与绝缘片32之间正确连接时,第一定位孔61b与第二定位孔3201可完全重合。这样,可以使得隔离件60的中心与绝缘片32的中心 相对,防止绝缘片32以及裸电芯31偏心设置于隔离件60而导致隔离件60的承载受力不均,进而导致隔离件60发生局部变形甚至损坏,无法实现对裸电芯31的缓冲减震作用的情况。此外,还可以便于在隔离件60与绝缘片32连接时起到定位标识作用。
可以理解的是,第一定位孔61b与第二定位孔3201,不仅能够实现透气,而且电解液可以通过定位孔进行循环,可以提高电解液的浸润程度。
一些实施例中,考虑到隔离件60要与绝缘片32之间进行热熔连接,第二定位孔3201的位置可避开绝缘片32的第二热熔连接位置3200,进而可以避免由于第二定位孔3201被第二热熔连接位置3200所遮挡,导致第二定位孔3201不容易识别。
可以理解的是,在其他一些实施例中,第二定位孔3201的位置可以设置于绝缘片32的第二热熔连接位置3200,此时,在将隔离件60与绝缘片32的相对位置确定好后,再进行热熔连接,可以通过热熔连接对第二定位孔3201进行材料填充,以增强绝缘片32的承载强度。
请参阅图12,一些实施例中,隔离件60上还设置有防呆结构,通过设置防呆结构可以有效防止隔离件60安装错误。具体地,该防呆结构可以为防呆孔63,防呆孔63偏离隔离件60的中心线设置,以实现防呆孔63的防呆功能;且防呆孔63为通孔,通过将防呆孔63设置为通孔,可以提高电解液的浸润效果。
结合图10所示,一些实施例中,由于壳体10的容纳腔10a为方形腔体,且容纳腔10a的四个边角为圆角,当将隔离件60放置于壳体10的容纳腔10a内部时,为了实现隔离件60与壳体10的紧密配合,将隔离件60设计为矩形片状结构,同时将隔离件60的四个边角设计为圆角结构,以实现隔离件60与壳体10的紧密配合。若隔离件60的四个边角为直角结构时,隔离件60的边缘与壳体10之间为线接触,此时隔离件60受到壳体10的力会集中与隔离件60的边角位置,导致隔离件60的边角位置容易发生损坏。因此,本实施例将隔离件60的四个边角设计为圆角时,隔离件60与壳体10之间可以为面接触,隔离件60可以将来自壳体10的力均匀分散到隔离件60的各个位置,减轻边角的压力,保证隔离件60的结构强度。
请再次参阅图12,进一步地,为了实现隔离件60对裸电芯31的承载作用,隔离件60的尺寸与裸电芯31的尺寸之间应满足:L2=L1±5mm;W2=W1±5mm;
其中,L2为隔离件60的长度,W2为隔离件60的宽度。由前述可知,L1是裸电芯31的长度,W1是裸电芯31的宽度,即隔离件60的长度L2可以为L1+5mm、L1+4.6mm、L1+3mm等,隔离件60的宽度W2可以为W1+6mm、W1+5mm、W1+3mm等。可以理解的是,上述隔离件60的长度和宽度方向的尺寸只是一些示例,在实际设计过程中,只要隔离件60的尺寸与裸电芯31的尺寸满足上述关系式时均可,在本实施例中不作具体限定。
第二方面,本申请还公开了一种用电设备,该用电设备可包括上述第一方面所述的储能装置。具体地,该用电设备可包括但不局限于车辆、储能系统等。
以上对本申请实施例公开的储能装置及用电设备进行了详细介绍,本文中应用了具体个例对本申请的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本申请的储能装置及用电设备及其核心思想;同时,对于本领域的一般技术人员,依据本申请的思想,在具体实施方式及应用范围上均会有改变之处,综上,本说明书内容不应理解为对本申请的限制。

Claims (22)

  1. 一种储能装置,其特征在于,所述储能装置包括
    壳体,所述壳体具有开口以及位于所述壳体内并与所述开口连通的容纳腔;
    顶盖组件,所述顶盖组件包括顶盖本体以及绝缘件,所述顶盖本体密封所述开口,所述绝缘件设置于所述顶盖本体的朝向所述容纳腔的一侧;以及
    电芯组件,所述电芯组件包括至少一个裸电芯以及包覆于所述裸电芯外部的绝缘片,所述裸电芯位于所述容纳腔内,所述绝缘片的邻近所述顶盖组件的一端热熔连接于所述绝缘件。
  2. 根据权利要求1所述的储能装置,其特征在于,所述顶盖本体具有朝向所述容纳腔的第一表面,所述绝缘件设置于所述第一表面,所述绝缘件具有背离所述第一表面的第二表面以及与所述第二表面的边缘连接的周缘面,所述周缘面沿着垂直于所述第一表面的方向朝向所述顶盖本体延伸,所述绝缘片的邻近所述顶盖组件的一端热熔连接于所述绝缘件的所述周缘面。
  3. 根据权利要求2所述的储能装置,其特征在于,沿垂直于所述第一表面的方向看时,所述第一表面的边缘环绕包围所述第二表面的边缘,所述第一表面的边缘和所述第二表面的边缘之间形成有间隙,所述绝缘片的邻近所述顶盖组件的一端位于所述间隙内,所述间隙为1mm-1.5mm。
  4. 根据权利要求2所述的储能装置,其特征在于,所述绝缘件包括至少一个热熔连接部,所述热熔连接部沿着所述第二表面的边缘的至少一部分设置,所述绝缘片的邻近所述顶盖组件的一端热熔连接于所述周缘面的位于所述热熔连接部的部分。
  5. 根据权利要求4所述的储能装置,其特征在于,沿垂直于所述第一表面的方向上,所述热熔连接部的背离所述第二表面的一面至所述第一表面上的距离为2mm-3mm。
  6. 根据权利要求4所述的储能装置,其特征在于,所述绝缘件为长条板状,所述绝缘件包括沿所述绝缘件的长度方向间隔设置的多个热熔连接部。
  7. 根据权利要求6所述的储能装置,其特征在于,所述多个热熔连接部至少包括第一热熔连接部和第二热熔连接部,所述第一热熔连接部和所述第二热熔连接部分别位于所述绝缘件的长度方向的两端,
    所述第二表面具有缓冲部,所述缓冲部位于所述第一热熔连接部和所述第二热熔连接部之间。
  8. 根据权利要求7所述的储能装置,其特征在于,所述储能装置还包括第一转接片、第二转接片,所述第一转接片、所述第二转接片分别连接于所述裸电芯的第一极耳、第二极耳;
    所述第一转接片和所述第二转接片位于所述缓冲部内,所述第一转接片位于所述第一热熔连接部和所述第二转接片之间。
  9. 根据权利要求6所述的储能装置,其特征在于,所述多个热熔连接部包括第一热熔连接部、第二热熔连接部以及第三热熔连接部,所述第一热熔连接部和所述第二热熔连接部分别位于所述绝缘件的长度方向的两端,所述第三热熔连接部位于所述绝缘件的长度方向的中部,
    所述第二表面具有第一缓冲部和第二缓冲部,所述第一缓冲部位于所述第一热熔连接部和所述第三热熔连接部之间,所述第二缓冲部位于所述第二热熔连接部和所述第三热熔连接部之间。
  10. 根据权利要求9所述的储能装置,其特征在于,所述储能装置还包括第一转接片、第二转接片,所述第一转接片、所述第二转接片分别连接于所述裸电芯的第一极耳、第二极耳;
    所述第一转接片位于所述第一缓冲部内,所述第二转接片位于所述第二缓冲部内。
  11. 根据权利要求8或10所述的储能装置,其特征在于,所述第一热熔连接部的靠近所述第一转接片的一侧设有第一缺口,所述第二热熔连接部的靠近所述第二转接片的一侧设有第二缺口,
    所述第一缺口、所述第二缺口的边角均设有倒角。
  12. 根据权利要求7或9所述的储能装置,其特征在于,所述周缘面的位于所述第一热熔连接部的部分和所述周缘面的位于所述第二热熔连接部的部分中的至少一者包括沿所述绝缘件的宽度方向相背设置的第一侧面和第二侧面,以及位于所述绝缘件的长度方向的一端并连接于所述第一侧面和所述第二侧面之间的 端面,所述第一侧面、所述第二侧面以及所述端面均具有与所述绝缘片热熔连接的至少一个热熔连接区。
  13. 根据权利要求12所述的储能装置,其特征在于,所述第一侧面和所述第二侧面的热熔连接区的数量大于所述端面的热熔连接区的数量,和/或,
    所述热熔连接区为长条状,所述第一侧面和所述第二侧面的热熔连接区的长度小于或等于所述端面的热熔连接区的长度,和/或,
    所述第一侧面和所述第二侧面的各所述热熔连接区的面积之和大于所述端面的各所述热熔连接区的面积之和。
  14. 根据权利要求12所述的储能装置,其特征在于,所述第二表面的位于所述第一热熔连接部的部分和所述第二表面的位于所述第二热熔连接部的部分中的至少一者设有凸条,所述凸条的一侧面邻接于所述端面,所述凸条的所述一侧面的至少一部分与所述绝缘片热熔连接。
  15. 根据权利要求12所述的储能装置,其特征在于,沿垂直于所述第一表面的方向上,所述热熔连接区至所述第一表面的距离为1mm-2mm。
  16. 根据权利要求12所述的储能装置,其特征在于,所述裸电芯包括底端面、连接于所述底端面的两个第一外侧面以及两个第二外侧面,两个所述第一外侧面相对设置,两个所述第二外侧面相对设置,且各所述第二外侧面连接于两个所述第一外侧面之间;
    所述绝缘片包括底部包覆区以及周向包覆区,所述底部包覆区覆盖所述裸电芯的所述底端面,所述周向包覆区包括两个主包覆部分和连接于所述主包覆部分的折叠部分,两个所述主包覆部分分别连接于所述底部包覆区的两侧,两个所述主包覆部分分别用于覆盖两个所述第一外侧面,所述折叠部分用于覆盖所述第二外侧面;
    两个所述主包覆部分分别热熔连接于所述第一侧面、所述第二侧面,所述折叠部分热熔连接于所述端面。
  17. 根据权利要求16所述的储能装置,其特征在于,两个所述主包覆部分的两相对侧均连接有所述折叠部分,位于两个所述主包覆部分的同一侧的两个所述折叠部分包覆于同一所述第二外侧面。
  18. 根据权利要求17所述的储能装置,其特征在于,还包括粘接件,所述粘接件一端连接于所述主包覆部分,另外一端连接于所述底部包覆区,和/或,所述粘接件一端连接于所述折叠部分,所述粘接件另外一端连接于主包覆部分,和/或,位于两个所述主包覆部分的同一侧两个所述折叠部分之间连接有粘接件。
  19. 根据权利要求17所述的储能装置,其特征在于,所述周缘面的位于所述第一热熔连接部的部分和所述周缘面的位于所述第二热熔连接部的部分均包括所述第一侧面、所述第二侧面以及所述端面,
    覆盖同一所述第二外侧面的两个所述折叠部分热熔连接于所述端面的同一热熔连接区。
  20. 根据权利要求19所述的储能装置,其特征在于,覆盖同一所述第二外侧面的两个所述折叠部分至少部分重合,所述同一热熔连接区位于两个所述折叠部分的重合区域内。
  21. 根据权利要求16所述的储能装置,其特征在于,所述折叠部分和所述折叠部分所覆盖的所述第二外侧面之间形成有导液流道,所述导液流道用于供电解液流过。
  22. 一种用电设备,其特征在于,包括如权利要求1-21任一项所述的储能装置。
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