WO2023230900A1 - 电池及用电设备 - Google Patents

电池及用电设备 Download PDF

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Publication number
WO2023230900A1
WO2023230900A1 PCT/CN2022/096422 CN2022096422W WO2023230900A1 WO 2023230900 A1 WO2023230900 A1 WO 2023230900A1 CN 2022096422 W CN2022096422 W CN 2022096422W WO 2023230900 A1 WO2023230900 A1 WO 2023230900A1
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WO
WIPO (PCT)
Prior art keywords
battery
battery core
temperature collecting
mounting plate
temperature
Prior art date
Application number
PCT/CN2022/096422
Other languages
English (en)
French (fr)
Inventor
黄灯龙
童衍辰
王慎波
蒋超
Original Assignee
东莞新能安科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 东莞新能安科技有限公司 filed Critical 东莞新能安科技有限公司
Priority to PCT/CN2022/096422 priority Critical patent/WO2023230900A1/zh
Priority to CN202280006940.4A priority patent/CN116420264A/zh
Publication of WO2023230900A1 publication Critical patent/WO2023230900A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, specifically, to a battery and electrical equipment.
  • Secondary batteries have outstanding advantages such as high energy density and good cycle performance, and are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage equipment and other fields.
  • the internal temperature of the battery is one of the important factors that affects the safety performance of the battery. It is necessary to obtain accurate temperature information inside the battery to better ensure the safety performance of the battery. Therefore, how to improve the accuracy of battery internal temperature detection has become an urgent problem to be solved in the field of battery technology.
  • Embodiments of the present application provide a battery and electrical equipment to improve the accuracy of internal temperature detection of the battery.
  • embodiments of the present application provide a battery, including a stacked first battery cell and a second battery cell, a buffer member, and a temperature collecting member; the buffer member is disposed on the first battery cell and the third battery cell. Between the two battery cores and/or on the side of the first battery core away from the second battery core; the temperature collecting member is provided between the first battery core and the buffer member for Collect the temperature of the first battery core; wherein, the temperature collecting member has a sheet-like structure, and the thickness direction of the temperature collecting member is parallel to the stacking direction of the first battery core and the second battery core.
  • the temperature collecting member has a sheet-like structure and is arranged between the first battery core and the buffer member, which can reduce the occupation of the space between the first battery core and the buffer member and reduce the expansion of the first battery core.
  • the impact of space can reduce the expansion space loss of the first battery cell caused by the temperature collecting component, thus reducing the risk of surface damage and leakage of the first battery cell and the risk of short circuit in the battery during use. It can also reduce the impact on the energy density of the battery. Influence.
  • the temperature collecting piece with a sheet-like structure can also accurately characterize the temperature of the battery and improve the reliability of temperature detection. At the same time, the response speed of the temperature collecting piece with a sheet-like structure is faster than that of a drop-shaped temperature collecting piece. Under high magnification conditions It can quickly respond to the temperature rise of the battery and improve the reliability of battery use.
  • the buffer member is provided with a receiving cavity corresponding to the position of the temperature collecting member.
  • the temperature collecting piece is arranged corresponding to the containing cavity. After the first battery cell expands, the temperature collecting piece can partially enter the containing cavity.
  • the containing cavity provides an avoidance space for the temperature collecting piece to avoid the temperature collecting piece and the buffer.
  • the component is squeezed to reduce the risk of the temperature collecting component being squeezed and damaged due to expansion of the first battery core.
  • the temperature collecting member includes a body and two protrusions.
  • the two protrusions are respectively formed on two opposite surfaces of the body along the stacking direction. In the stacking direction, the projection of one of the two protrusions close to the buffer member on the buffer member is located in the accommodation cavity.
  • the two protrusions respectively form two opposite surfaces of the body along the stacking direction.
  • the size of the temperature collecting piece in the stacking direction at the position corresponding to the protrusion is larger than the size of the other positions of the temperature collecting piece.
  • the battery further includes: a mounting plate disposed between the first battery core and the buffer member, the mounting plate having a mounting groove along which the The thickness direction of the mounting plate runs through the mounting plate, the thickness direction of the mounting plate is parallel to the stacking direction, and the temperature collecting piece is arranged in the mounting groove.
  • the installation plate is arranged to facilitate the installation of the temperature collection piece, and the temperature collection piece is installed in the installation groove of the installation plate.
  • the installation groove provides a shelter space for the temperature collection piece to avoid excessive occupation of the temperature collection piece and the installation plate.
  • the space between the first battery cell and the buffer member reduces the impact on the energy density of the battery.
  • the installation groove forms a first opening at an edge of the installation plate, and the temperature collecting member can be inserted into the installation groove from the first opening.
  • the installation groove is provided with a first opening, and the temperature collection piece can be inserted into the installation groove from the first opening, which facilitates the installation of the temperature collection piece into the installation groove.
  • an end of the installation groove close to the first opening is provided with a guide slope, and the guide slope is used to guide the temperature collecting member to be inserted into the installation groove.
  • one end of the installation groove close to the first opening is provided with a guide slope, so that the installation groove forms a larger entrance on the edge of the installation plate, so that the temperature collecting piece can be smoothly installed into the installation groove.
  • the hardness of the mounting plate is greater than the hardness of the buffer.
  • the hardness of the mounting plate is greater than the hardness of the buffer, which can not only stably support the temperature collecting part installed on the mounting plate, but also reduce the degree of compression of the mounting plate when the first battery cell expands or avoid the expansion of the first battery cell. When a battery cell expands, the mounting plate is compressed.
  • the mounting plate is made of insulating material.
  • the mounting plate is made of insulating material, which can reduce the risk of short circuit inside the battery.
  • the mounting plate is provided with a first through hole, and the first through hole penetrates the mounting plate along the stacking direction.
  • the first through hole is provided in the mounting plate, which can avoid the central expansion area of the first battery core, prevent the installation plate from causing the loss of expansion space of the first battery core, and effectively reduce the interference of the installation plate with the first battery core. Expansion leads to the risk of damage to the surface of the first battery cell and leakage.
  • the buffer member is provided with a second through hole that penetrates the buffer member along the stacking direction, and the first through hole is in the The projection on the buffer member at least partially overlaps the second through hole.
  • the second through hole is provided in the buffer member, and the projection of the first through hole of the mounting plate on the buffer member at least partially overlaps with the second through hole, which can avoid the central expansion area of the first battery core and avoid installation.
  • the arrangement of the plate and the buffer member causes the expansion space of the first battery core to be lost, effectively reducing the risk of the installation plate and the buffer member interfering with the expansion of the first battery core, resulting in damage to the surface of the first battery core and leakage of liquid.
  • the maximum thickness of the temperature collecting member is h1, and the thickness of the mounting plate is h2, satisfying: h2 ⁇ h1.
  • the maximum thickness of the temperature collecting piece is greater than the thickness of the mounting plate.
  • the maximum thickness of the temperature collecting member is h1
  • the thickness of the mounting plate is h2
  • the thickness of the buffer member compressed to the limit is h3, satisfying: h2+ h3 ⁇ h1.
  • the sum of the thickness of the mounting plate and the thickness of the buffer when compressed to the limit is greater than or equal to the maximum thickness of the temperature collecting piece. Then even if the buffer is compressed to the extreme state, the temperature collecting piece will not be squeezed, reducing the There is a risk of the temperature collecting piece being damaged by extrusion.
  • the battery further includes: a film disposed between the mounting plate and the buffer member, the film covering at least part of the temperature collecting member.
  • the film is disposed between the buffer member and the mounting plate and covers at least part of the temperature collection member, so that the temperature collection member always remains in contact with the first battery core, which is beneficial to the temperature collection member obtaining accurate temperature information.
  • the film is bonded or thermally connected to the mounting plate.
  • the film and the mounting plate are connected by bonding or hot melting, which is convenient and does not increase the thickness of the overall structure after the film and the mounting plate are connected.
  • the battery further includes: a circuit board and a wire, the circuit board is disposed on one side of the first battery core and the second battery core along the first direction. , the first direction is perpendicular to the stacking direction; one end of the wire is connected to the temperature collecting member, and the other end is connected to a part of the circuit board away from the first battery core and the second battery core.
  • the circuit board is provided with a channel, the channel penetrates the circuit board along the thickness direction of the circuit board, and the channel is configured for the wire to pass through.
  • the circuit board is provided with a channel for the wires to pass through, and the wires function as welding adapter wires.
  • the wires pass through the channels and are connected to the side of the circuit board away from the first battery core and the second battery core. , it can avoid the phosphor copper frame of the temperature collecting piece from being damaged due to bending of the sheet-structured temperature collecting piece during the assembly process, and can also reduce the extension path of the wire and reduce the length of the wire, thereby reducing the impact of the wire on the internal parts of the battery. Occupation of space.
  • the projection of the temperature collecting member on the circuit board at least partially overlaps with the channel.
  • the projection of the temperature collection piece on the circuit board at least partially overlaps with the channel, so that the temperature collection piece can be inserted between the first battery core and the buffer member from the channel position, which facilitates the installation of the temperature collection piece.
  • the first battery core includes a battery core body and tabs extending from an end of the battery core body, and the temperature collecting member is disposed at the end.
  • the temperature collecting piece is arranged at the end, and the temperature collecting piece is placed close to the tab, which not only makes the temperature collecting piece correspond to the area with a small expansion of the first battery core, but also reduces the risk of the temperature collecting piece being squeezed and damaged. , and also enables the temperature collection piece to collect more accurate temperature information.
  • an embodiment of the present application further provides an electrical device, including the battery provided in the embodiment of the first aspect.
  • the temperature collecting member of the battery according to the first embodiment has a sheet-like structure and is arranged between the first battery cell and the buffer member, which can reduce the occupation of the space between the first battery cell and the buffer member. , reducing the impact on the energy density of the battery.
  • the temperature collecting piece with a sheet-like structure can also accurately characterize the temperature of the battery and improve the reliability of temperature detection.
  • the response speed of the temperature collecting piece with a sheet-like structure is faster than that of a drop-shaped temperature collecting piece. Under high magnification conditions It can quickly respond to the temperature rise of the battery and improve the reliability of battery use of electrical equipment.
  • Figure 1 is a schematic structural diagram of a battery provided by some embodiments of the present application.
  • FIG. 2 is a schematic structural diagram of a battery provided by other embodiments of the present application.
  • FIG. 3 is a schematic structural diagram of a battery provided by some embodiments of the present application.
  • Figure 4 is an enlarged view of point A in Figure 3;
  • Figure 5 is a schematic structural diagram of a buffer provided by some embodiments of the present application.
  • Figure 6 is a schematic structural diagram of a buffer provided by other embodiments of the present application.
  • Figure 7 is a schematic diagram of the relative relationship between the temperature collection component and the buffer component provided by some embodiments of the present application.
  • Figure 8 is an enlarged view of B in Figure 7;
  • Figure 9 is a schematic diagram of the buffer member being compressed after the first battery core is expanded and the protrusion facing the buffer member is inserted into the through hole;
  • Figure 10 is a schematic diagram of the relative relationship between the temperature collecting component and the buffering component provided by other embodiments of the present application.
  • Figure 11 is a schematic structural diagram of a mounting plate provided by some embodiments of the present application.
  • Figure 12 is a schematic structural diagram of a mounting plate provided by other embodiments of the present application.
  • Figure 13 is an enlarged view of C in Figure 12;
  • Figure 14 is a schematic diagram of the relative relationship between the mounting plate, buffer parts and film;
  • Figure 15 is a cross-sectional view after the temperature collecting piece is inserted into the mounting slot of the mounting plate
  • Figure 16 is a cross-sectional view of the temperature collecting part, the mounting plate and the buffering part compressed to the limit;
  • Figure 17 is a schematic structural diagram of a battery provided in some embodiments of the present application.
  • Figure 18 is an enlarged view of D in Figure 17;
  • Figure 19 is an exploded view of a battery provided by other embodiments of the present application.
  • Figure 20 is a schematic structural diagram of a battery provided by some further embodiments of the present application.
  • Figure 21 is an enlarged view of E in Figure 20.
  • Icon 100-battery; 10-first cell; 11-cell body; 111-end; 12-pole lug; 20-second cell; 30-buffer; 31-accommodation cavity; 32-th Two openings; 33-second through hole; 40-temperature collection piece; 41-body; 411-first surface; 412-second surface; 42-protrusion; 43-wire; 50-box; 60-mounting plate ; 61-mounting groove; 611-groove wall; 6111-flat surface; 6112-guide slope; 62-first opening; 63-first through hole; 70-film; 71-third through hole; 80-circuit board; 81-channel; 82-third opening; X-stacking direction.
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is commonly placed when used, or the orientation or positional relationship of this application.
  • the orientation or positional relationship commonly understood by those skilled in the art is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
  • the terms “first”, “second”, “third”, etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.
  • the development of battery technology must consider multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters.
  • battery safety also needs to be considered.
  • the internal temperature of the battery is one of the important factors that affects the safety performance of the battery. It is necessary to obtain accurate temperature information inside the battery to better ensure the safety performance of the battery.
  • the battery includes a plurality of cells arranged in a stack.
  • a temperature collecting piece is provided on the side of the cell or between two adjacent cells. The temperature collecting piece can be in contact with the cell.
  • the temperature collecting piece placed between the two battery cores is in the shape of a water drop, combined with the structural shape of the water drop shaped temperature collecting piece, whether it is a soft-packed battery core or a steel shell battery, the water drop shaped temperature collecting piece is placed adjacent to There will be a loss of cell expansion space between the cells and the risk of the temperature collection piece squeezing into the cells, which may cause damage to the cell surface and leakage and cause a short circuit within the battery during use.
  • the water drop-shaped temperature collecting piece is wrapped with resin, the temperature response speed is slow under the condition of large-rate rapid temperature rise, and it is unable to accurately feedback the true temperature of the battery.
  • the battery includes a first battery cell and a second battery cell arranged in a stack, a buffer member and a The temperature collecting part and the buffering part are arranged between the first battery core and the second battery core and/or are arranged on the side of the first battery core away from the second battery core; the temperature collecting part is arranged between the first battery core and the buffering part time, used to collect the temperature of the first battery core; the temperature collecting piece has a sheet-like structure.
  • the temperature collecting member has a sheet-like structure and is arranged between the first battery core and the buffer member, which can reduce the occupation of the space between the first battery core and the buffer member and reduce the impact on the expansion space of the first battery core, thus Reducing the amount of expansion space loss of the first battery cell caused by the temperature collecting member reduces the risk of surface damage and leakage of the first battery cell and the risk of short circuit in the battery during use, and also reduces the impact on the energy density of the battery.
  • the temperature collecting piece with a sheet-like structure can also accurately characterize the temperature of the battery and improve the reliability of temperature detection. At the same time, the response speed of the temperature collecting piece with a sheet-like structure is faster than that of a drop-shaped temperature collecting piece. Under high magnification conditions It can quickly respond to the temperature rise of the battery and improve the reliability of battery use.
  • the battery pack disclosed in the embodiment of the present application can be used in, but is not limited to, electric two-wheeled vehicles, electric tools, drones, energy storage equipment and other electrical equipment.
  • the battery with the working conditions of this application can be used as the power supply system of the electrical equipment, which is beneficial to improving the charging and discharging safety of the power supply system and the electricity safety of the electrical equipment.
  • Embodiments of the present application provide an electrical device that uses a battery as a power source.
  • the electrical device may be, but is not limited to, electronic equipment, electric tools, electric vehicles, drones, and energy storage equipment.
  • electronic devices can include mobile phones, tablets, laptops, etc.
  • electric tools can include electric drills, electric saws, etc.
  • electric vehicles can include electric cars, electric motorcycles, electric bicycles, etc.
  • an embodiment of the present application provides a battery 100.
  • the battery 100 includes a stacked first battery cell 10 and a second battery cell 20, a buffer member 30, and a temperature collection member. 40;
  • the buffer member 30 is disposed between the first battery core 10 and the second battery core 20 and/or is disposed on the side of the first battery core 10 away from the second battery core 20;
  • the temperature collecting member 40 is disposed on the first battery core 10 and the buffer member 30 for collecting the temperature of the first battery core 10; wherein, the temperature collecting member 40 has a sheet-like structure, and the thickness direction of the temperature collecting member 40 is parallel to the first battery core 10 and the second battery core 20 The stacking direction X.
  • the battery 100 further includes a box body 50 formed with a receiving space.
  • the first battery core 10 , the second battery core 20 , the buffer member 30 and the temperature collecting member 40 are all accommodated in the accommodation space of the box 50 .
  • the battery 100 includes a plurality of cells, and a plurality refers to two or more cells.
  • multiple cells can be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that multiple cells are connected in series and in parallel.
  • Multiple battery cells can be directly connected in series, parallel, or mixed together to form a battery module; of course, multiple battery cells can also be connected in series, parallel, or mixed to form a battery module.
  • Each cell may be a secondary battery, and the secondary battery includes, but is not limited to, lithium-sulfur battery, sodium-ion battery, magnesium-ion battery, solid-state battery, etc.
  • the battery core can be in the shape of flat body, rectangular parallelepiped or other shapes.
  • the casing of the battery core can be in the form of a hard shell, that is, the battery core is a hard-shell battery core; the battery core can also be in the form of a soft-packed battery, that is, the battery core is a soft-packed battery core.
  • the battery 100 may only include a first battery cell 10 and a second battery cell 20 , that is, the battery 100 only has two battery cells.
  • the first battery cell 10 is away from the second battery cell 20
  • the side of the second battery core 20 facing away from the first battery core 10 is the wall of the box body 50 .
  • the temperature collecting member 40 may be disposed between the first battery core 10 and the buffer member 30 located between the first battery core 10 and the wall of the box 50 .
  • the temperature collecting member 40 may also be disposed between the first battery core 10 and the buffer member 30 located between the first battery core 10 and the second battery core 20 .
  • the cushioning member 30 may include foam, such as EVA (Ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer) foam, CR (Neoprene, neoprene rubber) foam, etc.
  • the cushioning member 30 may also include glue layers disposed on both sides of the foam along the stacking direction X. The two glue layers are respectively used to connect the cushioning member 30 to the structures on both sides.
  • the core 20 is connected, and another glue layer is used to connect the buffer 30 to the mounting plate 60 or membrane 70 (shown in Figure 18).
  • the glue layer may be a hard glue layer. After the buffer member 30 is squeezed along the stacking direction X, only the foam is compressed. The ultimate compression amount of foam can reach 70%, that is, the initial thickness of foam is M. After the foam is compressed to the limit, the ultimate thickness of foam is 0.3M.
  • the number of buffer members 30 may be one or more. In an embodiment where the number of buffer members 30 is one, the buffer member 30 may be disposed between the first battery core 10 and the second battery core 20 , or the buffer member 30 may be disposed between the first battery core 10 and the box 50 between the walls of the box, or the buffer 30 can also be disposed between the second battery core 20 and the wall of the box 50 . In an embodiment in which the number of buffer members 30 is multiple, there is a gap between the first battery core 10 and the second battery core 20 , between the first battery core 10 and the wall of the box 50 , and between the second battery core 20 and the box. Buffers 30 can be provided between the walls of the body 50 .
  • the battery 100 may also include three or more battery cells.
  • the side of the first battery cell 10 away from the second battery cell 20 may be the battery core, or may be the wall of the box 50 .
  • the side of the first battery core 10 facing away from the second battery core 20 may be the wall of the box 50
  • the temperature collecting member 40 is disposed on the first battery core 10 and between the first battery core 10 and the box. 50 between the buffer members 30 between the box walls.
  • the side of the first battery core 10 away from the second battery core 20 is the battery core.
  • the temperature collecting member 40 is disposed between the first battery core 10 and the second battery core 20 . between the buffer members 30.
  • one battery cell or multiple battery cells may be disposed between two adjacent buffer members 30 .
  • the structures of the plurality of buffer members 30 may be the same or different.
  • the structure of the buffer member 30 corresponding to the temperature collecting member 40 may be different from the buffer members 30 at other locations on the battery 100 .
  • FIG. 2 shows a situation in which the battery 100 includes three or more battery cells and a plurality of buffer members 30 arranged in a stack, and one battery cell is disposed between two adjacent buffer members 30 .
  • the battery 100 includes three or more battery cells and a plurality of buffer members 30 arranged in a stack, and multiple battery cells are disposed between two adjacent buffer members 30 .
  • the temperature collecting part 40 may be a thermistor, thermocouple, etc. with NTC (Negative Temperature Coefficient, negative temperature coefficient), PTC (Positive Temperature Coefficient, positive temperature coefficient), etc., which is not limited in this application.
  • the number of temperature collecting parts 40 may be one or multiple. In an embodiment where there are multiple temperature collecting members 40 , each temperature collecting member 40 is disposed between the buffer member 30 and the battery core located on one side of the buffer member 30 along the stacking direction X. Figures 1, 2, and 3 show the situation where the battery 100 includes a temperature collecting member 40.
  • the temperature collecting member 40 has a sheet structure and is arranged between the first battery core 10 and the buffer member 30 , which can reduce the occupation of the space between the first battery core 10 and the buffer member 30 and reduce the impact on the first battery core 10
  • the influence of the expansion space thereby reduces the amount of expansion space loss of the first battery cell 10 caused by the temperature collecting member 40, thereby reducing the risk of surface damage and leakage of the first battery cell 10 and causing a short circuit in the battery 100 during use, and also reduces the risk of damage to the battery 100. Effect of battery 100 energy density.
  • the temperature collecting part 40 with a sheet-like structure can also accurately characterize the temperature of the battery 100 and improve the reliability of temperature detection.
  • the response speed of the temperature collecting part 40 with a sheet-like structure is faster than the response speed of the temperature collecting part 40 with a drop-shaped structure. Under high-rate conditions, it can quickly respond to the temperature rise of the battery 100, thereby improving the reliability of the battery 100.
  • the buffer member 30 is provided with a receiving cavity 31 corresponding to the position of the temperature collecting member 40 .
  • the accommodating cavity 31 penetrates the buffer 30 along the stacking direction X.
  • the accommodating cavity 31 may also be a blind hole extending along the stacking direction X.
  • the accommodating cavity 31 can extend to the edge of the buffer member 30 , and a second opening 32 is formed on the edge of the buffer member 30 .
  • the accommodation cavity 31 may be a circumferentially closed hole, so that the arrangement of the accommodation cavity 31 does not affect the structural strength of the buffer member 30 .
  • the buffer member 30 is provided with an accommodating cavity 31 corresponding to the position of the temperature collecting member 40. Along the stacking direction X, part or all of the projection of the temperature collecting member 40 on the buffer member 30 is located in the accommodating cavity 31.
  • FIG. 7 and FIG. 8 show the situation where the projected part of the temperature collecting member 40 on the buffer member 30 is located in the accommodating cavity 31 .
  • the temperature collecting part 40 is arranged corresponding to the receiving cavity 31. After the first battery core 10 expands, the temperature collecting part 40 can partially enter the receiving cavity 31.
  • the receiving cavity 31 provides an avoidance space for the temperature collecting part 40 to avoid the temperature collecting part. 40 is pressed against the buffer member 30 to reduce the risk of the temperature collecting member 40 being squeezed and damaged due to expansion of the first battery core 10 .
  • the temperature collecting member 40 includes a body 41 and two protrusions 42.
  • the two protrusions 42 are respectively formed on two opposite surfaces of the body 41 along the stacking direction X. In the direction X, the projection of one of the two protrusions 42 close to the buffer member 30 on the buffer member 30 is located in the accommodating cavity 31 .
  • One of the two protrusions 42 close to the first battery core 10 is in contact with the first battery core 10 .
  • the protrusion 42 is a component of the temperature collecting component 40 used to collect temperature, so that the temperature collecting component 40 can respond to and detect temperature changes of the battery 100 .
  • the two opposite surfaces of the body 41 along the stacking direction The protrusions 42 are formed on the first surface 411 and the second surface 412 respectively.
  • the two protrusions 42 are provided on the body 41 so that along the stacking direction In other embodiments, along the stacking direction X, the projections of the two protrusions 42 on the body 41 may be completely staggered.
  • the protrusion 42 can be inserted into the accommodating cavity 31 to avoid extrusion between the protrusion 42 and the buffer member 30 .
  • the cross-sectional area of the accommodation cavity 31 should be greater than or equal to the cross-sectional area of the protrusion 42 .
  • the cross-sectional area of the accommodation cavity 31 is larger than the cross-sectional area of the protrusion 42 and smaller than the cross-sectional area of the body 41.
  • the projection of the body 41 on the buffer 30 completely covers the accommodation cavity 31. When a battery core 10 expands, only the protrusions 42 on the first surface 411 are inserted into the accommodating cavity 31 .
  • FIG. 10 in other embodiments, along the stacking direction Entering the accommodation cavity 31 in the direction
  • the two protrusions 42 respectively form two opposite surfaces of the body 41 along the stacking direction X.
  • the size of the temperature collecting member 40 along the stacking direction When the battery core 10 expands, the protrusion 42 provided on the second surface 412 is squeezed first, and the projection of the protrusion 42 provided on the first surface 411 on the buffer member 30 is located in the accommodating cavity 31, and the first battery core When 10 is expanded, the protrusion 42 close to the buffer member 30 can be inserted into the accommodation cavity 31 to prevent the protrusion 42 close to the buffer member 30 from being squeezed by the buffer member 30, thereby reducing the risk of the temperature collecting member 40 being damaged by extrusion.
  • the battery 100 further includes: a mounting plate 60, which is disposed on Between the first battery core 10 and the buffer 30, the mounting plate 60 has a mounting groove 61.
  • the mounting groove 61 penetrates the mounting plate 60 along the thickness direction of the mounting plate 60.
  • the thickness direction of the mounting plate 60 is parallel to the stacking direction X.
  • the temperature collecting member 40 is arranged in the installation groove 61.
  • the mounting plate 60 may be fixed between the first battery core 10 and the buffer member 30.
  • the mounting plate 60 is fixed on the surface of the buffer member 30 facing the first battery core 10, or the mounting plate 60 is fixed on the first battery core 10 facing the buffer.
  • Piece 30 on one side. In this embodiment, along the stacking direction Along the stacking direction shown) bonding.
  • the mounting groove 61 may be a circumferentially closed hole that penetrates the mounting plate 60 along the stacking direction The structural strength of the buffer member 30 will not be affected.
  • the mounting groove 61 may also have other structural forms.
  • the mounting groove 61 forms a first opening 62 at the edge of the mounting plate 60 so that the temperature collecting member 40 can be inserted into the mounting groove 61 from the first opening 62 .
  • one end of the mounting groove 61 extends to the edge of the mounting plate 60 and penetrates the edge of the mounting plate 60 to form a first opening 62 , and the temperature collecting member 40 can be inserted into the mounting groove 61 from the first opening 62 , to facilitate the temperature collection piece 40 to be installed into the installation groove 61 .
  • the temperature collecting member 40 is disposed in the mounting groove 61 , and the protrusion 42 formed on the second surface 412 extends out of the mounting groove 61 along the stacking direction X, or the protrusion 42 formed on the second surface 412 faces the surface of the first battery core 10 It is flush with the surface of the mounting plate 60 facing the first battery core 10 so that the protrusions 42 forming the second surface 412 can contact the first battery core 10 to achieve temperature collection of the first battery core 10 .
  • the protrusions 42 formed on the second surface may extend out of the mounting groove 61 along the stacking direction X, and the protrusions 42 formed on the second surface 412 may also be located within the mounting groove 61 in the stacking direction X.
  • the installation plate 60 is arranged to facilitate the installation of the temperature collection part 40, and the temperature collection part 40 is installed in the installation slot 61 of the installation plate 60 to prevent the temperature collection part 40 and the installation plate 60 from occupying the first battery core 10 and the buffer part 30 too much. The space between them reduces the impact on the energy density of the battery 100 .
  • a guide bevel 6112 is provided at one end of the mounting groove 61 close to the first opening 62 .
  • the guiding bevel 6112 is used to guide the temperature collecting component 40 to be inserted into the mounting groove 61 .
  • the installation groove 61 has two opposite groove walls 611.
  • Each groove wall 611 includes a flat surface 6111 and a guide slope 6112.
  • One end of the guide slope 6112 is connected to the flat surface 6111, and one end of the guide slope 6112 away from the flat surface 6111 extends to the installation plate.
  • the flat surfaces 6111 of the two groove walls 611 are arranged in parallel, and the guide inclined surfaces 6112 are arranged obliquely relative to the flat surface 6111.
  • the distance between the guide inclined surfaces 6112 of the two groove walls 611 and the end connected to the flat surface 6111 is smaller than the guide inclined surfaces 6112 of the two groove walls 611.
  • the distance from one end away from the flat surface 6111 is such that the distance between the two groove walls 611 at the first opening 62 is greater than the distance between the two groove walls 611 at other positions.
  • the two groove walls 611 may both be flat surfaces 6111 arranged in parallel, so that the distance between the two groove walls 611 at any position is the same.
  • a guide slope 6112 is provided at one end of the installation groove 61 close to the edge of the installation plate 60 so that the installation groove 61 forms a larger first opening 62 on the edge of the installation plate 60 so that the temperature collecting piece 40 can be smoothly installed. into the installation slot 61.
  • the hardness of the mounting plate 60 is greater than the hardness of the buffer 30 .
  • the hardness of the mounting plate 60 is greater than the hardness of the buffer 30 , where the mounting plate 60 can be a hard plate.
  • the mounting plate 60 is an incompressible plate, and the mounting plate 60 will not be compressed when it is squeezed along the stacking direction X.
  • the installation board 60 may be a PC (Polycarbonate, polycarbonate) board, a wooden board, or the like.
  • the material of the mounting plate 60 may be a compressible material.
  • the compression amount of the mounting plate 60 along the stacking direction X is smaller than the compression amount of the buffer member 30 along the stacking direction X.
  • the hardness of the mounting plate 60 is greater than the hardness of the buffer 30, which can not only stably support the temperature collecting part 40 installed on the mounting plate 60, but also reduce the degree of compression of the mounting plate 60 when the first battery core 10 expands, or avoid When the first battery core 10 expands, the mounting plate 60 is compressed.
  • the mounting plate 60 is made of insulating material, which can reduce the risk of internal short circuit of the battery 100 .
  • the material of the mounting plate 60 may also be a conductor or a semiconductor material while ensuring that there will be no short circuit inside the battery 100 due to the mounting plate 60 .
  • the expansion of the battery core is not uniform.
  • the side of the first battery core 10 facing the buffer 30 has a central expansion area and a peripheral expansion area.
  • the peripheral expansion area surrounds the central expansion area, and the central expansion area is along the If the expansion amount in the stacking direction X is greater than the expansion amount of the peripheral expansion area in the stacking direction
  • the mounting plate 60 is provided with a first through hole 63 , and the first through hole 63 penetrates the mounting plate 60 along the stacking direction X.
  • the first through hole 63 is provided in the center of the mounting plate 60.
  • the first through hole 63 is provided corresponding to the central expansion area on the side of the first battery core 10 facing the buffer 30. When the central expansion area expands, the first through hole 63 allows the central expansion area to expand.
  • the expansion area expands in the first through hole 63 along the stacking direction X.
  • the first through hole 63 may be an elliptical hole, a rectangular hole, a circular hole, etc.
  • Figures 11 and 12 show the case where the first through hole 63 is a rectangular hole.
  • the first through hole 63 is disposed in the center of the mounting plate 60 to avoid the central expansion area of the first battery core 10, thereby preventing the installation plate 60 from causing a loss of expansion space of the first battery core 10, and effectively reducing the interference of the mounting plate 60 with the first battery core 10.
  • the expansion of the battery core 10 leads to the risk of damage to the surface of the first battery core 10 and leakage of liquid.
  • the buffer member 30 is provided with a second through hole 33.
  • the second through hole 33 penetrates the buffer member 30 along the stacking direction
  • the projection on the element 30 at least partially overlaps the second through hole 33 .
  • the second through hole 33 is provided corresponding to the central expansion area on the side of the first battery core 10 facing the buffer 30. When the central expansion area expands, the second through hole 33 allows the central expansion area to expand along the stacking direction X in the second through hole 33. .
  • the second through holes 33 completely overlap. In other embodiments, along the stacking direction The outline of the projection on the component 30 is so that the portion of the second through hole 33 overlaps with the projection of the first through hole 63 on the buffer component 30 . In some embodiments, along the stacking direction Outside the outline of the two through holes 33 , the projected portion of the first through hole 63 on the buffer member 30 overlaps with the second through hole 33 .
  • the projection of the first through hole 63 on the buffer member 30 partially overlaps with the first through hole 63 .
  • the second through hole 33 may be an elliptical hole, a rectangular hole, a circular hole, etc.
  • FIG. 6 , FIG. 7 , and FIG. 14 all show the case where the second through hole 33 is a rectangular hole.
  • the second through hole 33 is provided in the center of the buffer member 30, and the projection of the first through hole 63 of the mounting plate 60 on the buffer member 30 overlaps with the second through hole 33, which can avoid the central expansion area of the first battery core 10. This avoids the loss of the expansion space of the first battery core 10 due to the installation of the mounting plate 60 and the buffer member 30, effectively reducing the risk of the installation plate 60 and the buffer member 30 interfering with the expansion of the first battery core 10, resulting in surface damage and leakage of the first battery core 10. .
  • the maximum thickness of the temperature collecting member 40 is h1
  • the thickness of the mounting plate 60 is h2, which satisfies: h2 ⁇ h1.
  • the maximum thickness h1 of the temperature collecting member 40 refers to the distance along the stacking direction X between the surface of the temperature collecting member 40 closest to the first battery core 10 and the surface of the temperature collecting member 40 farthest from the first battery core 10 .
  • the maximum thickness h1 of the temperature collecting member 40 is between the side of the protrusion 42 forming the first surface 411 facing away from the first surface 411 and the side of the protrusion 42 forming the second surface 412 facing away from the second surface 412 distance.
  • the mounting plate 60 is a plate of equal thickness, and the thickness of any position of the mounting plate 60 is the same. In other embodiments, the mounting plate 60 is a plate of unequal thickness, and the thickness h2 of the mounting plate 60 is the maximum thickness of the mounting plate 60 .
  • the maximum thickness of the temperature collecting piece 40 is greater than the thickness of the mounting plate 60. After the temperature collecting piece 40 is installed in the mounting slot 61, the temperature collecting piece 40 can extend out of the mounting slot 61 along the stacking direction X, so that the temperature collecting piece 40 can be connected with the mounting plate 60. The first battery core 10 is in contact, so that the collected temperature information is more accurate. In this embodiment, the two protrusions 42 of the temperature collecting member 40 extend out of the mounting groove 61 in directions away from each other.
  • the maximum thickness of the temperature collecting member 40 is h1
  • the thickness of the mounting plate 60 is h2
  • the thickness of the buffer member 30 compressed to the limit is h3, which satisfies: h2+h3 ⁇ h1.
  • the buffering member 30 is compressed to the limit, which means that the buffering member 30 reaches the compression limit and the thickness of the buffering member 30 will not continue to decrease when the first battery core 10 further expands in the stacking direction X.
  • the sum of the thickness of the mounting plate 60 and the thickness of the buffer member 30 when compressed to the limit is greater than or equal to the maximum thickness of the temperature collecting member 40, then even if the buffer member 30 is compressed to the extreme state, the temperature collecting member 40 will not be squeezed, reducing the There is a risk that the temperature collecting piece 40 is damaged by being squeezed.
  • the temperature collecting member 40 In order to accurately obtain the temperature of the first battery core 10 , the temperature collecting member 40 needs to be kept in contact with the first battery core 10 .
  • the first battery core 10 may drive the temperature collecting component 40 to approach the buffer member 30 along the stacking direction X in the mounting slot 61.
  • the temperature collecting member 40 When the temperature collecting member 40 is moved in the direction, the temperature collecting member 40 is not in contact with the first battery core 10 , resulting in the collected temperature information being unable to represent the true temperature of the first battery core 10 .
  • the battery 100 further includes: a film 70 disposed between the mounting plate 60 and the buffer member 30 , and the film 70 covers at least part of the temperature collecting member 40 .
  • Film 70 is made of light and thin material with good flexibility and elasticity.
  • the film 70 can be a PI film (Polyimide Film) or other materials.
  • the film 70 is fixed on the side of the mounting plate 60 facing away from the first battery core 10 and covers the temperature collecting member 40 .
  • the film 70 can cover part or all of the temperature collecting member 40 so that the temperature collecting member 40 can always Contact with the first battery cell 10 .
  • the film 70 is stretched by the temperature collecting member 40 to elastically deform and resist rebound.
  • the temperature collecting element 40 moves toward the first battery core 10 along the stacking direction X, and is always in contact with the first battery core 10 .
  • the thickness of the film 70 is h4, the maximum thickness of the temperature collecting member 40 is h1, the thickness of the mounting plate 60 is h2, and the thickness of the buffer member 30 compressed to the limit is h3, which satisfies: h2+h3+h4 ⁇ h1+h4.
  • the film 70 is provided with a third through hole 71 that penetrates the film 70 along the stacking direction X.
  • the projection of the first through hole 63 and the second through hole 33 on the film 70 is the same as The third through holes 71 overlap.
  • the third through hole 71 is provided corresponding to the central expansion area on the side of the first battery core 10 facing the buffer 30. When the central expansion area expands, the third through hole 71 allows the central expansion area to expand along the stacking direction X in the third through hole 71. .
  • the projection of the first through hole 63 on the film 70 and the projection of the second through hole 33 on the film 70 completely overlap with the third through hole 71 .
  • the outline is set around the outline of the projection of the first through hole 63 on the film 70 and the outline of the projection of the second through hole 33 on the film 70, so that the part of the third through hole 71 is consistent with the first through hole 63 on the film 70.
  • the projection on 70 overlaps with the projection of the second through hole 33 on the film 70 .
  • the projected outline of the first through hole 63 on the film 70 and the projected outline of the second through hole 33 on the film 70 are both located outside the outline of the third through hole 71, and the projected portion of the first through hole 63 on the film 70 and the second through hole 33 are The projected portion of the hole 33 on the film 70 overlaps with the third through hole 71 .
  • the film 70 is disposed between the buffer member 30 and the mounting plate 60 and covers at least the temperature collecting member 40.
  • the film 70 can keep the temperature collecting member 40 in contact with the first battery core 10, which is conducive to the accurate acquisition of the temperature collecting member 40. temperature information.
  • the film 70 and the mounting plate 60 are bonded or thermally connected.
  • the film 70 and the mounting plate 60 are connected by bonding or hot melting, which is convenient and does not increase the thickness of the overall structure after the film 70 and the mounting plate 60 are connected.
  • the battery 100 further includes: a circuit board 80 and wires 43.
  • the circuit board 80 is disposed along the first battery core 10 and the second battery core 20. On one side of the direction, the first direction is perpendicular to the stacking direction , the circuit board 80 is provided with a channel 81, the channel 81 penetrates the circuit board 80 along the thickness direction of the circuit board 80, and the channel 81 is configured for the wire 43 to pass through.
  • the channel 81 extends to the edge of the circuit board 80 so that the channel 81 forms a third opening 82 at the edge of the circuit board 80 to facilitate the conductor 43 to enter the channel 81 from the third opening 82 .
  • the channel 81 may also be a circumferentially closed hole structure.
  • the first direction is perpendicular to the stacking direction X.
  • the first battery core 10 includes a battery core body 11 and tabs 12 .
  • the tabs 12 extend from the end 111 of the battery core body 11 .
  • the tabs 12 of the first battery core 10 may be electrically connected to the circuit board 80 , and the circuit board 80 is disposed close to the tabs 12 and opposite to the end 111 .
  • the first direction is parallel to the winding axis direction, and the circuit board 80 is located at one end of the winding axis direction.
  • the first direction is perpendicular to the stacking direction of the pole pieces of the cell and the tabs 12 extend from the cell body 11 along the first direction.
  • the circuit board 80 is located on the first cell 10 along the first direction. one end.
  • the circuit board 80 is provided with a channel 81 for the conductor 43 to pass through.
  • the conductor 43 functions as a welding adapter wire.
  • the conductor 43 passes through the channel 81 and is connected to a part of the circuit board 80 away from the first battery core 10 and the second battery core. 20 can prevent the temperature collecting part 40 of the sheet structure from being bent during the assembly process, causing damage to the phosphor bronze frame of the temperature collecting part 40, and can also reduce the extension path of the wire 43 and reduce the length of the wire 43. , thereby reducing the occupation of the internal space of the battery 100 by the wires 43 .
  • the projection of the temperature collecting member 40 on the circuit board 80 at least partially overlaps with the channel 81 .
  • the projection of the temperature collecting member 40 on the circuit board 80 is located in the channel 81 , so that the projection of the temperature collecting member 40 on the circuit board 80 completely overlaps with the channel 81 .
  • the projection of the temperature collecting member 40 on the circuit board 80 is located in the channel 81 , so that the projection of the temperature collecting member 40 on the circuit board 80 partially overlaps with the channel 81 .
  • the first opening 62 of the mounting slot 61 is disposed facing the channel 81.
  • the projection of the mounting slot 61 on the circuit board 80 is located in the channel 81.
  • the temperature collecting member 40 can be in the circuit board 80.
  • the projection of the temperature collecting member 40 on the circuit board 80 at least partially overlaps the channel 81, so that the temperature collecting member 40 can be inserted between the first battery core 10 and the buffer member 30 from the position of the channel 81, thereby facilitating the installation of the temperature collecting member 40.
  • the first battery core 10 includes a battery core body 11 and a tab 12 extending from an end 111 of the battery core body 11 , and the temperature collecting member 40 is disposed at the end 111 .
  • the temperature collecting member 40 is disposed at the end 111 , which means that the temperature collecting member 40 is disposed between the first battery core 10 and the buffer member 30 and close to the tab 12 .
  • the area close to the tab 12 belongs to the peripheral expansion area of the first battery core 10 with a smaller expansion amount.
  • the temperature at the tabs 12 is generally higher than the temperature of the battery core body 11 . Therefore, the temperature of the area of the first battery core 10 close to the tabs 12 is more stable. Indicates the actual temperature of the first battery cell 10 .
  • the temperature collecting member 40 is disposed at the end 111, then the temperature collecting member 40 is disposed close to the tab 12, which not only makes the temperature collecting member 40 corresponding to the area with a smaller expansion of the first battery core 10, but also reduces the temperature collecting member 40 from being squeezed. The risk of pressure damage is eliminated, and the temperature collecting part 40 can collect more accurate temperature information.
  • An embodiment of the present application also provides an electrical device.
  • the electrical device includes an electrical body 41 and the battery 100 provided in any of the above embodiments.
  • the battery 100 is used to supply power to the electrical body 41 .
  • the temperature collecting member 40 of the battery 100 in any of the above embodiments has a sheet structure and is arranged between the first battery cell 10 and the buffer member 30, which can reduce the occupation of the space between the first battery cell 10 and the buffer member 30. , reducing the impact on the energy density of the battery 100 .
  • the temperature collecting part 40 with a sheet-like structure can also accurately characterize the temperature of the battery 100 and improve the reliability of temperature detection.
  • the response speed of the temperature collecting part 40 with a sheet-like structure is faster than the response speed of the temperature collecting part 40 with a drop-shaped structure. Under high-rate conditions, it can quickly respond to the temperature rise of the battery 100, thereby improving the reliability of the battery 100 of the electrical equipment.

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Abstract

本申请提供了一种电池及用电设备，涉及电池技术领域。电池包括层叠设置的第一电芯和第二电芯、缓冲件以及温度采集件；缓冲件设置于第一电芯和第二电芯之间和/或设置于第一电芯背离第二电芯的一侧；温度采集件设置于第一电芯和缓冲件之间，用于采集第一电芯的温度；温度采集件为片状结构，温度采集件的厚度方向平行于第一电芯和第二电芯的层叠方向。片状结构的温度采集件，一方面能够减小对第一电芯和缓冲件之间的空间的占用，降低对第一电芯膨胀空间的影响，从而降低温度采集件导致第一电芯的膨胀空间损失量，还能降低对电池的能量密度的影响，另一方面，温度采集件响应速度更快，在大倍率条件下可以快速对电池的温度上升作出响应。

Description

电池及用电设备 技术领域
本申请涉及电池技术领域，具体而言，涉及一种电池及用电设备。
背景技术
二次电池具备能量密度大、循环性能好等突出优点，并广泛应用于便携式电子设备、电动交通工具、电动工具、无人机、储能设备等领域。
电池的安全性是否满足使用需求是当前广泛研究的课题。而电池的内部温度是影响电池的安全性能的重要因素之一，需要获取到电池内部准确的温度信息，以更好的保证电池的安全性能。因此，如何提高电池的内部温度检测的准确性成为电池技术领域亟待解决的问题。
发明内容
本申请实施例提供一种电池及用电设备，以提高电池的内部温度检测的准确性。
第一方面，本申请实施例提供一种电池，包括层叠设置的第一电芯和第二电芯、缓冲件以及温度采集件；所述缓冲件设置于所述第一电芯和所述第二电芯之间和/或设置于所述第一电芯背离所述第二电芯的一侧；所述温度采集件设置于所述第一电芯和所述缓冲件之间，用于采集所述第一电芯的温度；其中，所述温度采集件为片状结构，所述温度采集件的厚度方向平行于所述第一电芯和所述第二电芯的层叠方向。
上述技术方案中，温度采集件为片状结构，设置在第一电芯和缓冲件之间，能够减小对第一电芯和缓冲件之间的空间的占用，降低对第一电芯膨胀空间的影响，从而降低温度采集件导致第一电芯的膨胀空间损失量，从而降低第一电芯表面破损漏液以及在使用过程造成电池内短路的风险，还能降低对电池的能量密度的影响。片状结构的温度采集件还可以准确表征电池的温度，提高温度检测的可靠性，同时片状结构的温度采集件响应速度相比水滴状的温度采集件的响应速度更快，在大倍率条件下可以快速对电池的温度上升作出响应，提升电池使用的可靠性。
在本申请第一方面的一些实施例中，所述缓冲件设置有与所述温度采集件位置对应的容置腔。
上述技术方案中，温度采集件对应容置腔设置，在第一电芯膨胀后，温度采集件能够部分进入容置腔内，容置腔提供温度采集件的避让空间，避免温度采集件与缓冲件挤压，降低因第一电芯膨胀导致温度采集件被挤压损坏的风险。
在本申请第一方面的一些实施例中，所述温度采集件包括本体和两个凸起，两个所述凸起分别形成于所述本体沿所述层叠方向相对的两个表面，沿所述层叠方向，两个所述凸起中靠近所述缓冲件的一者在所述缓冲件上的投影位于所述容置腔内。
上述技术方案中，两个凸起分别形成本体沿层叠方向相对的两个表面，温度采集件在凸起对应位置的沿层叠方向的尺寸大于温度采集件的其他位置的尺寸，当第一电芯膨胀时，靠近第一电芯的凸起最先被挤压，靠近缓冲件的凸起在所述缓冲件上的投影位于容置腔内，第一电芯膨胀时则靠近缓冲件的凸起能够插入容置腔内，避免靠近缓冲件的凸起与缓冲件挤压，降低温度采集件被挤压损坏的风险。
在本申请第一方面的一些实施例中，所述电池还包括：安装板，设置于所述第一电芯和所述缓冲件之间，所述安装板具有安装槽，所述安装槽沿所述安装板的厚度方向贯穿所述安装板，所述安装板的厚度方向平行于所述层叠方向，所述温度采集件设置于所述安装槽内。
上述技术方案中，安装板的设置便于安装温度采集件，且温度采集件安装于安装板的安装槽内，安装槽提供温度采集件的避位空间，避免温度采集件和安装板过多的占用第一电芯和缓冲件之间的空间，降低对电池的能量密度的影响。
在本申请第一方面的一些实施例中，所述安装槽在所述安装板的边缘形成第一开口，所述温度采集件能够从所述第一开口插入所述安装槽。
上述技术方案中，安装槽设有第一开口，温度采集件能够从第一开口插入安装槽内，便于温度采集件安装入安装槽内。
在本申请第一方面的一些实施例中，所述安装槽的靠近所述第一开口的一端设置有引导斜面，所述引导斜面用于引导所述温度采集件插入所述安装槽。
上述技术方案中，安装槽的靠近第一开口的一端设置有引导斜面，以使安装槽在安装板的边缘上形成较大的入口，以使温度采集件能够顺利的安装入安装槽内。
在本申请第一方面的一些实施例中，所述安装板的硬度大于所述缓冲件的硬度。
上述技术方案中，安装板的硬度大于缓冲件的硬度，不仅能够为稳定支撑安装在安装板上的温度采集件，还能减小在第一电芯膨胀时安装板的压缩程度或者避免在第一电芯膨胀时安装板被压缩。
在本申请第一方面的一些实施例中，所述安装板为绝缘材质。
上述技术方案中，安装板为绝缘材质，能够降低电池内部短路的风险。
在本申请第一方面的一些实施例中，所述安装板设有第一通孔，沿所述层叠方向，所述第一通孔贯穿所述安装板。
上述技术方案中，第一通孔设置于安装板，能够避让第一电芯的中央膨胀区域，避免安装板的设置使得第一电芯的膨胀空间损失，有效降低安装板干涉第一电芯的膨胀导致第一电芯表面破损漏液的风险。
在本申请第一方面的一些实施例中，所述缓冲件设有第二通孔，沿所述层叠方向，所述第二通孔贯穿所述缓冲件，所述第一通孔在所述缓冲件上的投影与所述第二通孔至少部分重叠。
上述技术方案中，第二通孔设置于缓冲件，且安装板的第一通孔在缓冲件上的投影与第二通孔至少部分重叠，能够避让第一电芯的中央膨胀区域，避免安装板和缓冲件的设置使得第一电芯的膨胀空间损失，有效降低安装板和缓冲件干涉第一电芯的膨胀导致第一电芯表面破损漏液的风险。
在本申请第一方面的一些实施例中，所述温度采集件的最大厚度为h1，所述安装板的厚度为h2，满足：h2＜h1。
上述技术方案中，温度采集件的最大厚度大于安装板的厚度，则温度采集件安装于安装槽内后，温度采集件能够沿层叠方向延伸出安装槽，以使温度采集件能够与第一电芯接触，从而使采集的温度信息更为准确。
在本申请第一方面的在一些实施例中，所述温度采集件的最大厚度为h1、所述安装板的厚度为h2、所述缓冲件被压缩至极限的厚度为h3，满足：h2+h3≥h1。
上述技术方案中，安装板的厚度和缓冲件被压缩至极限的厚度之和大于或等于温度采集件的最大厚度，则即使缓冲件被压缩至极限状态，温度采集件不会被挤压，降低温度采集件被挤压损坏的风险。
在本申请第一方面的一些实施例中，所述电池还包括：薄膜，设置于所述安装板和所述缓冲件之间，所述薄膜覆盖所述温度采集件的至少部分。
上述技术方案中，薄膜设置在缓冲件和安装板之间并覆盖温度采集件的至少部分，使温度采集件始终保持与第一电芯接触的状态，有利于温度采集件获取准确的温度信息。
在本申请第一方面的一些实施例中，所述薄膜与所述安装板粘接或热熔连接。
上述技术方案中，通过粘接或者热熔的方式实现薄膜和安装板连接，连接方式方便，且不会增大薄膜和安装板连接后的整体结构的厚度。
在本申请第一方面的一些实施例中，所述电池还包括：电路板和导线，所述电路板设置于所述第一电芯和所述第二电芯的沿第一方向的一侧，所述第一方向垂直于所述层叠方向；所述导线的一端连接于所述温度采集件，另一端连接于所述电路板的背离所述第一电芯和所述第二电芯的一侧；其中，所述电路板设置有通道，所述通道沿所述电路板的厚度方向贯穿所述电路板，所述通道被配置为供所述导线穿过。
上述技术方案中，电路板上设有供导线穿过的通道，导线起到焊接转接线的作用，导线从通道穿过并连接于电路板的背离第一电芯和第二电芯的一侧，能够避免片状结构的温度采集件在组装过程中发生弯折造成温度采集件的磷铜架受损，还可以减小导线的延伸路径，减小导线的长度，从而减少导线对电池的内部空间的占用。
在本申请第一方面的一些实施例中，沿所述电路板的厚度方向，所述温度采集件在所述电路板上的投影与所述通道至少部分重叠。
上述技术方案中，温度采集件在电路板上的投影与通道至少部分重叠，使得温度采集件能够从通道位置插入第一电芯和缓冲件之间，便于温度采集件安装。
在本申请第一方面的一些实施例中，所述第一电芯包括电芯本体和从所述电芯本体的端部延伸出的极耳，所述温度采集件设置于所述端部。
上述技术方案中，温度采集件设置于端部，则温度采集件靠近极耳设置，不仅使得温度采集件对应第一电芯膨胀量较小的区域设置，降低温度采集件被挤压损坏的风险，还使得温度采集件能够采集更准确的温度信息。
第二方面，本申请实施例还提供一种用电设备，包括第一方面实施例提供的电池。
上述技术方案中，第一方面实施例的电池的温度采集件为片状结构，设置在第一电芯和缓冲件之间，能够减小对第一电芯和缓冲件之间的空间的占用，降低对电池的能量密度的影响。片状结构的温度采集件还可以准确表征电池的温度，提高温度检测的可靠性，同时片状结构的温度采集件响应速度相比水滴状的温度采集件的响应速度更快，在大倍率条件下可以快速对电池的温度上升作出响应，提升用电设备电池使用的可靠性。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定。
图1为本申请一些实施例提供的电池的结构示意图；
图2为本申请另一些实施例提供的电池的结构示意图；
图3为本申请又一些实施例提供的电池的结构示意图；
图4为图3中A处的放大图；
图5为本申请一些实施例提供的缓冲件的结构示意图；
图6为本申请另一些实施例提供的缓冲件的结构示意图；
图7为本申请一些实施例提供的温度采集件和缓冲件的相对关系示意图；
图8为图7中B处的放大图；
图9为第一电芯膨胀后缓冲件压缩且面向缓冲件的凸起插入通孔内的示意图；
图10为本申请另一些实施例提供的温度采集件和缓冲件的相对关系的示意图；
图11为本申请一些实施例提供的安装板的结构示意图；
图12为本申请另一些实施例提供的安装板的结构示意图；
图13为图12中C处的放大图；
图14为安装板、缓冲件和薄膜三者相对关系示意图；
图15为温度采集件插设于安装板的安装槽后的剖视图；
图16为温度采集件、安装板和压缩至极限的缓冲件三者的剖视图；
图17为本申请再一些实施例提供的电池的结构示意图；
图18为图17中D处的放大图；
图19为本申请另一些实施例提供的电池的爆炸图；
图20为本申请再又一些实施例提供的电池的结构示意图；
图21为20中E处的放大图。
图标：100-电池；10-第一电芯；11-电芯本体；111-端部；12-极耳；20-第二电芯；30-缓冲件；31-容置腔；32-第二开口；33-第二通孔；40-温度采集件；41-本体；411-第一表面；412-第二表面；42-凸起；43-导线；50-箱体；60-安装板；61-安装槽；611-槽壁；6111-平直面；6112-引导斜面；62-第一开口；63-第一通孔；70-薄膜；71-第三通孔；80-电路板；81-通道；82-第三开口；X-层叠方向。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，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、详细地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请实施例的描述中，需要说明的是，指示方位或位置关系为基于附图所示的方位或位置关系，或者是该申请产品使用时惯常摆放的方位或位置关系，或者是本领域技术人员惯常理解的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的安全性。而电池的内部温度是影响电池的安全性能的重要因素之一，需要获取到电池内部准确的温度信息，以更好的保证电池的安全性能。
电池包括层叠设置的多个电芯，为了获取电池的温度信息，在电芯的侧面或相邻的两个电芯之间设置温度采集件，温度采集件可以与电芯接触。
设置在两个电芯之间的温度采集件为水滴状时，结合水滴状的温度采集件的结构形状，无论是软包电芯还是钢壳电芯，水滴状的温度采集件放在相邻的电芯之间会损失电芯膨胀空间以及温度采集件有挤压到电芯的风险，从而可能导致电芯表面破损漏液以及在使用过程造成电池内短路。此外，水滴状温度采集件由于外表包裹有树脂，在大倍率快速温升条件下，温度响应速度慢，无法准确反馈电池的真实温度。
基于上述考虑，为了缓解温度采集件对电芯膨胀控制的影响和获取电池准确的温度值，发明人设计了一种电池，电池包括层叠设置的第一电芯和第二电芯、缓冲件以及温度采集件，缓冲件设置于第一电芯和第二电芯之间和/或设置于第一电芯背离第二电芯的一侧；温度采集件设置于第 一电芯和缓冲件之间，用于采集第一电芯的温度；温度采集件为片状结构。
温度采集件为片状结构，设置在第一电芯和缓冲件之间，能够减小对第一电芯和缓冲件之间的空间的占用，降低对第一电芯膨胀空间的影响，从而降低温度采集件导致第一电芯的膨胀空间损失量，从而降低第一电芯表面破损漏液以及在使用过程造成电池内短路的风险，还能降低对电池的能量密度的影响。
片状结构的温度采集件还可以准确表征电池的温度，提高温度检测的可靠性，同时片状结构的温度采集件响应速度相比水滴状的温度采集件的响应速度更快，在大倍率条件下可以快速对电池的温度上升作出响应，提升电池使用的可靠性。
本申请实施例公开的电池包可以但不限用于电动两轮车、电动工具、无人机、储能设备等用电设备中。可以使用具备本申请工况的电池作为用电设备的电源系统，这样，有利于提高电源系统的充放电安全和用电设备的用电安全。
本申请实施例提供一种使用电池作为电源的用电设备，用电设备可以为但不限于电子设备、电动工具、电动交通工具、无人机、储能设备。其中，电子设备可以包括手机、平板、笔记本电脑等，电动工具可以包括电钻、电锯等，电动交通工具可以包括电动汽车、电动摩托车、电动自行车等。
如图1、图2、图3、图4所示，本申请实施例提供一种电池100，电池100包括层叠设置的第一电芯10和第二电芯20、缓冲件30以及温度采集件40；缓冲件30设置于第一电芯10和第二电芯20之间和/或设置于第一电芯10背离第二电芯20的一侧；温度采集件40设置于第一电芯10和缓冲件30之间，用于采集第一电芯10的温度；其中，温度采集件40为片状结构，温度采集件40的厚度方向平行于第一电芯10和第二电芯20的层叠方向X。
在一些实施例中，电池100还包括箱体50，箱体50形成有容纳空间。第一电芯10、第二电芯20、缓冲件30和温度采集件40均容纳于箱体50的容纳空间内。
电池100包括多个电芯，多个是指两个及两个以上。在电池100中，多个电芯之间可串联或并联或混联，混联是指多个电芯中既有串联又有并联。多个电芯之间可直接串联或并联或混联在一起以形成电芯模组；当然，也可以是多个电芯先串联或并联或混联组成电芯模组。
每个电芯可以为二次电池，二次电池包括锂硫电池、钠离子电池、镁离子电池、固态电池等，但不局限于此。电芯可呈扁平体、长方体或其它形状等。电芯的外壳可以呈现为硬壳形式，即电芯为硬壳电芯；电芯也可以呈现为软包形式，即电芯为软包电芯。
如图1所示，电池100可以仅包括第一电芯10和第二电芯20，即电池100仅具有两个电芯，这种实施例中，第一电芯10背离第二电芯20的一侧为箱体50的箱壁，第二电芯20背离第一电芯10的一侧为箱体50的箱壁。在这种实施例中，温度采集件40可以设置于第一电芯10与位于第一电芯10和箱体50的箱壁之间的缓冲件30之间。当然，温度采集件40也可以设置于第一电芯10与位于第一电芯10和第二电芯20之间的缓冲件30之间。
缓冲件30可以包括泡棉，比如EVA(Ethylene-vinyl acetate copolymer，乙烯-醋酸乙烯酯共聚物)泡棉、CR(Neoprene，氯丁橡胶)泡棉等。缓冲件30还可以包括设置在泡棉沿层叠方向X两侧的胶层，两个胶层分别用于使缓冲件30与其两侧的结构连接，比如一个胶层将缓冲件30和第二电芯20相连，另一个胶层用于将缓冲件30和安装板60或薄膜70(图18中示出)相连。该胶层可以为硬质胶层，缓冲件30沿层叠方向X受到挤压后，仅有泡棉被压缩。泡棉的极限压缩量可以达到70％，即泡棉的初始厚度为M，泡棉被压缩到极限后，泡棉的极限厚度为0.3M。
缓冲件30的数量可以是一个或者多个。在缓冲件30的数量为一个的实施例中，缓冲件30可以设置于第一电芯10和第二电芯20之间，或者缓冲件30可以设置于第一电芯10和箱体50的箱壁之间，或者缓冲件30也可以设置于第二电芯20和箱体50的箱壁之间。在缓冲件30的数量为多个的实施例中，第一电芯10和第二电芯20之间、第一电芯10和箱体50的箱壁之间以及第二电芯20和箱体50的箱壁之间均可以设置缓冲件30。
电池100也可以包括三个及三个以上数量的电芯，这种实施例中，第一电芯10背离第二 电芯20的一侧可以是电芯，也可以是箱体50的箱壁。如图2所示，第一电芯10背离第二电芯20的一侧可以是箱体50的箱壁，温度采集件40设置于第一电芯10与位于第一电芯10和箱体50的箱壁之间的缓冲件30之间。如图3所示，第一电芯10背离第二电芯20的一侧是电芯，温度采集件40设置于第一电芯10与位于第一电芯10和第二电芯20之间的缓冲件30之间。
在电池100包括三个及三个以上数量的电芯且包括多个缓冲件30的实施例中，相邻的两个缓冲件30之间可以设置一个电芯，也可以设置多个电芯。多个缓冲件30的结构可以相同，也可以不相同。比如与温度采集件40对应的缓冲件30的结构可以不同于电池100其他位置的缓冲件30。图2中示出了电池100包括层叠设置的三个及三个以上数量的电芯和多个缓冲件30，相邻的两个缓冲件30之间设置一个电芯的情况。图3中，电池100包括层叠设置的三个及三个以上数量的电芯和多个缓冲件30，相邻的两个缓冲件30之间设置多个电芯的情况。
温度采集件40可以是具有NTC(Negative Temperature Coefficient，负温度系数)、PTC(Positive Temperature Coefficient，正温度系数)的热敏电阻、热电偶等，本申请在此不作限制。温度采集件40的数量可以是一个，也可以是多个。在温度采集件40为多个的实施例中，每个温度采集件40设置在缓冲件30和位于该缓冲件30沿层叠方向X的一侧的电芯之间。图1、图2、图3中示出了电池100包括一个温度采集件40的情况。
温度采集件40为片状结构，设置在第一电芯10和缓冲件30之间，能够减小对第一电芯10和缓冲件30之间的空间的占用，降低对第一电芯10膨胀空间的影响，从而降低温度采集件40导致第一电芯10的膨胀空间损失量，从而降低第一电芯10表面破损漏液以及在使用过程造成电池100内短路的风险，还能降低对电池100的能量密度的影响。片状结构的温度采集件40还可以准确表征电池100的温度，提高温度检测的可靠性，同时片状结构的温度采集件40响应速度相比水滴状的温度采集件40的响应速度更快，在大倍率条件下可以快速对电池100的温度上升作出响应，提升电池100使用的可靠性。
如图5、图6所示，在一些实施例中，缓冲件30设置有与温度采集件40位置对应的容置腔31。在一些实施例中，容置腔31沿层叠方向X贯穿缓冲件30。在另一些实施例中，容置腔31也可以是沿层叠方向X延伸的盲孔。
如图5所示，容置腔31可以延伸至缓冲件30的边缘，在缓冲件30的边缘形成第二开口32。
如图6所示，容置腔31可以是周向封闭的孔，使得容置腔31的设置不会影响缓冲件30的结构强度。
缓冲件30设置有与温度采集件40位置对应的容置腔31，沿层叠方向X，温度采集件40在缓冲件30上的投影的部分或者全部位于容置腔31内。图7、图8中示出了温度采集件40在缓冲件30上的投影的部分位于容置腔31内的情况。
温度采集件40对应容置腔31设置，在第一电芯10膨胀后，温度采集件40能够部分进入容置腔31内，容置腔31为温度采集件40提供避让空间，避免温度采集件40与缓冲件30挤压，降低因第一电芯10膨胀导致温度采集件40被挤压损坏的风险。
请参照图8、图9，在一些实施例中，温度采集件40包括本体41和两个凸起42，两个凸起42分别形成于本体41沿层叠方向X相对的两个表面，沿层叠方向X，两个凸起42中靠近缓冲件30的一者在缓冲件30上的投影位于容置腔31内。两个凸起42中靠近第一电芯10的一者与第一电芯10接触。
凸起42是温度采集件40用于采集温度的部件，以使温度采集件40能够响应和检测电池100的温度变化。
定义本体41沿层叠方向X的相对的两个表面分别为第一表面411和第二表面412，第一表面411面向缓冲件30设置，第二表面412面向第一电芯10设置，两个凸起42分别形成于第一表面411和第二表面412。
两个凸起42设置于本体41，以使沿层叠方向X，两个凸起42在本体41上投影重叠，可 以是部分重叠，也可以是完全重叠。在另一些实施例中，沿层叠方向X，两个凸起42在本体41上的投影可以完全错开。
沿层叠方向X，形成于第一表面411的凸起42的投影位于缓冲件30的容置腔31内，如图9所示，在第一电芯10膨胀时，形成于第一表面411的凸起42能够插入容置腔31内，以避免凸起42与缓冲件30形成挤压。其中，如图8所示，容置腔31的截面积应大于或者等于凸起42的截面积。在一些实施例中，容置腔31的截面积大于凸起42的截面积且小于本体41的截面积，沿层叠方向X，本体41在缓冲件30上的投影完全覆盖容置腔31，第一电芯10膨胀时，只有第一表面411上的凸起42插入容置腔31内。如图10所示，在另一些实施例中，沿层叠方向X，本体41在缓冲件30上的投影可以位于容置腔31内，则第一电芯10膨胀时，本体41也可以沿层叠方向X进入容置腔31内，避免本体41和缓冲件30形成挤压，进一步降低温度采集件40本体挤压损坏的风险。
两个凸起42分别形成本体41沿层叠方向X相对的两个表面，温度采集件40在凸起42对应位置的沿层叠方向X的尺寸大于温度采集件40的其他位置的尺寸，当第一电芯10膨胀时，设于第二表面412的凸起42最先被挤压，设于第一表面411的凸起42在缓冲件30上的投影位于容置腔31内，第一电芯10膨胀时则靠近缓冲件30的凸起42能够插入容置腔31内，避免靠近缓冲件30的凸起42与缓冲件30挤压，降低温度采集件40被挤压损坏的风险。
为了便于温度采集件40的安装在缓冲件30和第一电芯10之间，请结合参照图4、图11、图12，在一些实施例中，电池100还包括：安装板60，设置于第一电芯10和缓冲件30之间，安装板60具有安装槽61，安装槽61沿安装板60的厚度方向贯穿安装板60，安装板60的厚度方向平行于层叠方向X，温度采集件40设置于安装槽61内。
安装板60可以是固定于第一电芯10和缓冲件30之间，比如安装板60固定于缓冲件30面向第一电芯10的表面，或者安装板60固定于第一电芯10面向缓冲件30一侧。在本实施例中，沿层叠方向X，安装板60面向第一电芯10的一面设有粘胶，以使安装板60粘接于第一电芯10面向缓冲件30的表面。沿层叠方向X，安装板60背离向第一电芯10的一面也可以设有粘胶，用于实现安装板60和缓冲件30粘接或者用于实现安装板60和薄膜70(图18中示出)粘接。
安装槽61可以是周向封闭且沿层叠方向X贯穿安装板60的孔，如图11所示，安装槽61为沿层叠方向X贯穿安装板60两侧的矩形孔，使得安装槽61的设置不会影响缓冲件30的结构强度。
在一些实施例中，安装槽61也可以是其他结构形式。比如，如图12所示，在一些实施例中，安装槽61在安装板60的边缘形成第一开口62，以使温度采集件40能够从第一开口62插入安装槽61。
在一些实施例中，安装槽61的一端延伸至安装板60的边缘，并贯穿安装板60的该边缘，以形成第一开口62，温度采集件40能够从第一开口62插入安装槽61内，便于温度采集件40安装入安装槽61内。
温度采集件40设置于安装槽61内，形成于第二表面412的凸起42沿层叠方向X延伸出安装槽61，或者形成于第二表面412的凸起42面向第一电芯10的表面与安装板60面向第一电芯10的表面平齐，以使形成第二表面412的凸起42能够与第一电芯10接触，从而实现对第一电芯10的温度采集。形成于第二表面的凸起42可以沿层叠方向X延伸出安装槽61，形成于第二表面412的凸起42在层叠方向X上也可以位于安装槽61内。
安装板60的设置便于安装温度采集件40，且温度采集件40安装于安装板60的安装槽61内，避免温度采集件40和安装板60过多的占用第一电芯10和缓冲件30之间的空间，降低对电池100的能量密度的影响。
为了方便温度采集件40从第一开口62插入，请参照图13，安装槽61的靠近第一开口62的一端设置有引导斜面6112，引导斜面6112用于引导温度采集件40插入安装槽61。
安装槽61具有相对的两个槽壁611，每个槽壁611包括平直面6111和引导斜面6112，引 导斜面6112的一端与平直面6111相连，引导斜面6112远离平直面6111的一端延伸至安装板60的边缘。两个槽壁611的平直面6111平行布置，引导斜面6112相对平直面6111倾斜布置，两个槽壁611的引导斜面6112与平直面6111连接的一端的距离小于两个槽壁611的引导斜面6112远离平直面6111的一端的距离，以使两个槽壁611在第一开口62处的距离大于两个槽壁611在其他位置的距离。
在另一些实施例中，两个槽壁611也可以均为平行布置的平直面6111，则两个槽壁611任意位置的距离相同。
安装槽61的靠近安装板60的边缘的一端设置有引导斜面6112，以使安装槽61在安装板60的边缘上形成较大的第一开口62，以使温度采集件40能够顺利的安装入安装槽61内。
在一些实施例中，安装板60的硬度大于缓冲件30的硬度。
在本实施例中，安装板60的硬度大于缓冲件30的硬度，其中，安装板60可为硬质板。
在一些实施例中，安装板60为不可压缩板，安装板60受到沿层叠方向X的挤压时不会被压缩。安装板60可以为PC(Polycarbonate，聚碳酸酯)板、木板等。
在另一些实施例中，安装板60的材质可以是可压缩材质，在安装板60的硬度大于缓冲件30的硬度的情况下，第一电芯10膨胀时，在相同的挤压力的条件下，安装板60沿层叠方向X的压缩量小于缓冲件30沿层叠方向X的压缩量。
安装板60的硬度大于缓冲件30的硬度，不仅能够稳定支撑安装在安装板60上的温度采集件40，还能减小在第一电芯10膨胀时安装板60的压缩程度，或者避免在第一电芯10膨胀时安装板60被压缩。
在一些实施例中，安装板60为绝缘材质，能够降低电池100内部短路的风险。
在另一些实施例中，根据实际需要，在保证电池100内部不会因安装板60导致短路的情况下，安装板60的材质也可以是导体或者半导体材质。
电芯膨胀并非均匀膨胀，对第一电芯10而言，第一电芯10面向缓冲件30的一侧具有中央膨胀区域和外围膨胀区域，外围膨胀区域围绕于中央膨胀区域，中央膨胀区域沿层叠方向X的膨胀量大于外围膨胀区域在层叠方向X的膨胀量，则安装板60和缓冲件30与中央膨胀区域相对的部分相对于外围膨胀区域相对的部分被挤压更为严重。
基于此，请继续参照图11、图12，在一些实施例中，安装板60设有第一通孔63，沿层叠方向X，第一通孔63贯穿安装板60。
第一通孔63设置于安装板60的中央，第一通孔63对应第一电芯10面向缓冲件30一侧的中央膨胀区域设置，当中央膨胀区域膨胀时，第一通孔63允许中央膨胀区域沿层叠方向X第一通孔63内膨胀。第一通孔63可以是椭圆形孔、矩形孔、圆形孔等，图11、图12中示出了第一通孔63为矩形孔的情况。
第一通孔63设置于安装板60的中央，能够避让第一电芯10的中央膨胀区域，避免安装板60的设置使得第一电芯10的膨胀空间损失，有效降低安装板60干涉第一电芯10的膨胀，导致第一电芯10表面破损漏液的风险。
请参照图6、图7、图14，在一些实施例中，缓冲件30设有第二通孔33，沿层叠方向X，第二通孔33贯穿缓冲件30，第一通孔63在缓冲件30上的投影与第二通孔33至少部分重叠。
第二通孔33对应第一电芯10面向缓冲件30一侧的中央膨胀区域设置，当中央膨胀区域膨胀时，第二通孔33允许中央膨胀区域沿层叠方向X第二通孔33内膨胀。
在一些实施例中，沿层叠方向X，第一通孔63在缓冲件30上的投影的轮廓与第二通孔33的轮廓重合，以使第一通孔63在缓冲件30上的投影与第二通孔33完全重叠。在另一些实施例中，沿层叠方向X，第一通孔63在缓冲件30上的投影可以位于第二通孔33内，第二通孔33的轮廓围设于第一通孔63在缓冲件30上的投影的轮廓外周，以使第二通孔33的部分与第一通孔63在 缓冲件30上的投影重叠。在又一些实施例中，沿层叠方向X，第二通孔33位于第一通孔63在缓冲件30上的投影内，第一通孔63在缓冲件30上的投影的轮廓围设于第二通孔33的轮廓外，第一通孔63在缓冲件30上的投影的部分与第二通孔33重叠。
当然，在另一些实施例中，沿层叠方向X，第一通孔63在缓冲件30上的投影和第一通孔63部分重叠。
第二通孔33可以是椭圆形孔、矩形孔、圆形孔等，图6、图7、图14中均示出了第二通孔33为矩形孔的情况。
第二通孔33设置于缓冲件30的中央，且安装板60的第一通孔63在缓冲件30上的投影与第二通孔33重叠，能够避让第一电芯10的中央膨胀区域，避免安装板60和缓冲件30的设置使得第一电芯10的膨胀空间损失，有效降低安装板60和缓冲件30干涉第一电芯10的膨胀导致第一电芯10表面破损漏液的风险。
如图15所示，在一些实施例中，温度采集件40的最大厚度为h1，安装板60的厚度为h2，满足：h2＜h1。
温度采集件40的最大厚度h1，是指沿层叠方向X，温度采集件40最靠近第一电芯10的表面和温度采集件40最远离第一电芯10的表面之间的距离。在本实施例中，温度采集件40的最大厚度h1为形成第一表面411的凸起42背离第一表面411的一面与形成第二表面412的凸起42背离第二表面412的一面之间的距离。
在本实施例中，安装板60为等厚板，安装板60的任意位置的厚度相同。在另一些实施例中，安装板60为非等厚板，安装板60的厚度h2为安装板60的最大厚度。
温度采集件40的最大厚度大于安装板60的厚度，则温度采集件40安装于安装槽61内后，温度采集件40能够沿层叠方向X延伸出安装槽61，以使温度采集件40能够与第一电芯10接触，从而使采集的温度信息更为准确。在本实施例中，温度采集件40的两个凸起42沿相互背离的方向延伸出安装槽61。
如图16所示，在一些实施例中，温度采集件40的最大厚度为h1、安装板60的厚度为h2、缓冲件30被压缩至极限的厚度为h3，满足：h2+h3≥h1。
缓冲件30被压缩至极限，是指缓冲件30到达压缩极限，第一电芯10沿层叠方向X进一步膨胀时缓冲件30的厚度不会继续减小的状态。
安装板60的厚度和缓冲件30被压缩至极限的厚度之和大于或等于温度采集件40的最大厚度，则即使缓冲件30被压缩至极限状态，温度采集件40不会被挤压，降低温度采集件40被挤压损坏的风险。
为了准确地获取第一电芯10的温度，需要将温度采集件40保持与第一电芯10接触的状态。当温度采集件40插设于安装槽61内，在第一电芯10膨胀的过程中，第一电芯10可能驱动温度采集件40在安装槽61内沿层叠方向X向靠近缓冲件30的方向移动，出现温度采集件40不与第一电芯10接触的状态，导致采集的温度信息不能表征第一电芯10的真实温度。
基于此，如图17、图18所示，在一些实施例中，电池100还包括：薄膜70，设置于安装板60和缓冲件30之间，薄膜70覆盖温度采集件40的至少部分。
薄膜70材质轻薄，柔性和弹性较好。薄膜70可以为PI膜(Polyimide Film，聚酰亚胺薄膜)或者其他材质。
在本实施例中，薄膜70固定于安装板60背离第一电芯10的一侧并覆盖温度采集件40，薄膜70可以覆盖温度采集件40的部分或者全部，以使温度采集件40能够始终与第一电芯10接触。
第一电芯10膨胀且驱动温度采集件40在安装槽61内沿层叠方向X向靠近缓冲件30的方向移动的过程中，薄膜70被温度采集件40拉伸发生弹性变形并抵抗回弹，温度采集件40在薄膜 70的弹性力的驱使下沿层叠方向X向靠近第一电芯10的方向移动，始终与第一电芯10保持接触。
薄膜70的厚度为h4，温度采集件40的最大厚度为h1、安装板60的厚度为h2、缓冲件30被压缩至极限的厚度为h3，满足：h2+h3+h4≥h1+h4。
在一些实施例中，薄膜70设有第三通孔71，沿层叠方向X，所述第三通孔71贯穿薄膜70，第一通孔63和第二通孔33在薄膜70上的投影与第三通孔71重叠。
第三通孔71对应第一电芯10面向缓冲件30一侧的中央膨胀区域设置，当中央膨胀区域膨胀时，第三通孔71允许中央膨胀区域沿层叠方向X第三通孔71内膨胀。
在一些实施例中，沿层叠方向X，第一通孔63在薄膜70上的投影的轮廓、第二通孔33在薄膜70上的投影的轮廓和第三通孔71的轮廓重合，以使第一通孔63在薄膜70上的投影和第二通孔33在薄膜70上的投影与第三通孔71完全重叠。在另一些实施例中，沿层叠方向X，第一通孔63在薄膜70上的投影和第二通孔33在薄膜70上的投影可以位于第三通孔71内，第三通孔71的轮廓围设于第一通孔63在薄膜70上的投影的轮廓和第二通孔33在薄膜70上的投影的轮廓外周，以使第三通孔71的部分与第一通孔63在薄膜70上的投影和第二通孔33在薄膜70上的投影重叠。在另一些实施例中，沿层叠方向X，第三通孔71位于第一通孔63在薄膜70上的投影和第二通孔33在薄膜70上的投影内，第一通孔63在薄膜70上的投影的轮廓和第二通孔33在薄膜70上的投影的轮廓均围设于第三通孔71的轮廓外，第一通孔63在薄膜70上的投影的部分和第二通孔33在薄膜70上的投影的部分与第三通孔71重叠。
薄膜70设置在缓冲件30和安装板60之间并至少覆盖温度采集件40，则薄膜70能够使温度采集件40始终保持与第一电芯10接触的状态，有利于温度采集件40获取准确的温度信息。
薄膜70固定于安装板60的方式有很多，比如，在一些实施例中，薄膜70与安装板60粘接或热熔连接。通过粘接或者热熔的方式实现薄膜70和安装板60连接，连接方式方便，且不会增大薄膜70和安装板60连接后的整体结构的厚度。
如图19、图20、图21所示，在一些实施例中，电池100还包括：电路板80和导线43，电路板80设置于第一电芯10和第二电芯20的沿第一方向的一侧，第一方向垂直于层叠方向X；导线43的一端连接于温度采集件40，另一端连接于电路板80的背离第一电芯10和第二电芯20的一侧；其中，电路板80设置有通道81，通道81沿电路板80的厚度方向贯穿电路板80，通道81被配置为供导线43穿过。
在本实施例中，通道81延伸至电路板80的边缘，以使通道81在电路板80的边缘形成第三开口82，便于导线43从第三开口82处进入通道81。在另一些实施例中，通道81也可以周向封闭的孔结构。
在本实施例中，第一方向垂直层叠方向X。第一电芯10包括电芯本体11和极耳12，极耳12从电芯本体11的端部111延伸出。第一电芯10的极耳12可以与电路板80电连接，电路板80靠近极耳12设置并与端部111相对设置。对卷绕式电芯，则第一方向与卷绕轴线方向平行，电路板80位于卷绕轴线方向的一端。对叠片式电芯，则第一方向与电芯的极片的堆叠方向垂直且极耳12沿第一方向从电芯本体11延伸出，电路板80位于第一电芯10沿第一方向的一端。
电路板80上设有供导线43穿过的通道81，导线43起到焊接转接线的作用，导线43从通道81穿过并连接于电路板80的背离第一电芯10和第二电芯20的一侧，能够避免片状结构的温度采集件40在组装过程中发生弯折造成温度采集件40的磷铜架受损，还可以减小导线43的延伸路径，减小导线43的长度，从而减少导线43对电池100的内部空间的占用。
在一些实施例中，沿电路板80的厚度方向，温度采集件40在电路板80上的投影与通道81至少部分重叠。
在本实施例中，沿电路板80的厚度方向，温度采集件40在电路板80上的投影位于通道81内，以使温度采集件40在电路板80上的投影与通道81完全重叠。在另一些实施例中，沿电路板80的厚度方向，温度采集件40在电路板80上的投影部分位于通道81内，以使温度采集件40 在电路板80上的投影与通道81部分重叠。
在本实施例中，安装槽61的第一开口62面向通道81设置，沿电路板80的厚度方向，安装槽61在电路板80上的投影位于通道81内，则温度采集件40可以在电路板80、安装板60、缓冲件30和薄膜70安装完成后依次经过通道81和安装槽61的第一开口62插入安装槽61内，便于安装温度采集件40。
温度采集件40在电路板80上的投影与通道81至少部分重叠，使得温度采集件40能够从通道81位置插入第一电芯10和缓冲件30之间，便于温度采集件40安装。
在一些实施例中，第一电芯10包括电芯本体11和从电芯本体11的端部111延伸出的极耳12，温度采集件40设置于端部111。
温度采集件40设置于端部111，是指温度采集件40设置于第一电芯10和缓冲件30之间并靠近极耳12设置。靠近极耳12的区域属于第一电芯10的膨胀量较小的外围膨胀区域。对第一电芯10而言，由于电流流过极耳12，极耳12处的温度一般高于电芯本体11的温度，因此第一电芯10的靠近极耳12的区域的温度更能表征第一电芯10的真实温度。
因此，温度采集件40设置于端部111，则温度采集件40靠近极耳12设置，不仅使得温度采集件40对应第一电芯10膨胀量较小的区域设置，降低温度采集件40被挤压损坏的风险，还使得温度采集件40能够采集更准确的温度信息。
本申请实施例还提供一种用电设备，用电设备包括用电本体41和上述任意实施例提供的电池100，电池100用于为用电本体41供电。
上述任意实施例的电池100的温度采集件40为片状结构，设置在第一电芯10和缓冲件30之间，能够减小对第一电芯10和缓冲件30之间的空间的占用，降低对电池100的能量密度的影响。片状结构的温度采集件40还可以准确表征电池100的温度，提高温度检测的可靠性，同时片状结构的温度采集件40响应速度相比水滴状的温度采集件40的响应速度更快，在大倍率条件下可以快速对电池100的温度上升作出响应，提升用电设备电池100使用的可靠性。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (17)

  1. 一种电池，包括：
    层叠设置的第一电芯和第二电芯；
    缓冲件，设置于所述第一电芯和所述第二电芯之间和/或设置于所述第一电芯背离所述第二电芯的一侧；
    温度采集件，设置于所述第一电芯和所述缓冲件之间，用于采集所述第一电芯的温度；
    其中，所述温度采集件为片状结构，所述温度采集件的厚度方向平行于所述第一电芯和所述第二电芯的层叠方向。
  2. 根据权利要求1所述的电池，其中，所述缓冲件设置有与所述温度采集件位置对应的容置腔。
  3. 根据权利要求2所述的电池，其中，所述温度采集件包括本体和两个凸起，两个所述凸起分别形成于所述本体沿所述层叠方向相对的两个表面，沿所述层叠方向，两个所述凸起中靠近所述缓冲件的一者在所述缓冲件上的投影位于所述容置腔内。
  4. 根据权利要求1-3任一项所述的电池，其中，所述电池还包括：
    安装板，设置于所述第一电芯和所述缓冲件之间，所述安装板具有安装槽，所述安装槽沿所述安装板的厚度方向贯穿所述安装板，所述安装板的厚度方向平行于所述层叠方向，所述温度采集件设置于所述安装槽内。
  5. 根据权利要求4所述的电池，其中，所述安装槽在所述安装板的边缘形成第一开口，所述温度采集件能够从所述第一开口插入所述安装槽。
  6. 根据权利要求5所述的电池，其中，所述安装槽的靠近所述第一开口的一端设置有引导斜面，所述引导斜面用于引导所述温度采集件插入所述安装槽。
  7. 根据权利要求4所述的电池，其中，所述安装板的硬度大于所述缓冲件的硬度。
  8. 根据权利要求4所述的电池，其中，所述安装板设有第一通孔，沿所述层叠方向，所述第一通孔贯穿所述安装板。
  9. 根据权利要求8所述的电池，其中，所述缓冲件设有第二通孔，沿所述层叠方向，所述第二通孔贯穿所述缓冲件，所述第一通孔在所述缓冲件上的投影与所述第二通孔至少部分重叠。
  10. 根据权利要求4所述的电池，其中，所述温度采集件的最大厚度为h1，所述安装板的厚度为h2，满足：h2＜h1。
  11. 根据权利要求10所述的电池，其中，所述温度采集件的最大厚度为h1、所述安装板的厚度为h2、所述缓冲件被压缩至极限的厚度为h3，满足：h2+h3≥h1。
  12. 根据权利要求4所述的电池，其中，所述电池还包括：
    薄膜，设置于所述安装板和所述缓冲件之间，所述薄膜覆盖所述温度采集件的至少部分。
  13. 根据权利要求12所述的电池，其中，所述薄膜与所述安装板粘接或热熔连接。
  14. 根据权利要求1所述的电池，其中，所述电池还包括：
    电路板，设置于所述第一电芯和所述第二电芯的沿第一方向的一侧，所述第一方向垂直于所述层叠方向；
    导线，所述导线的一端连接于所述温度采集件，另一端连接于所述电路板的背离所述第一电芯和所述第二电芯的一侧；
    其中，所述电路板设置有通道，所述通道沿所述电路板的厚度方向贯穿所述电路板，所述通道被配置为供所述导线穿过。
  15. 根据权利要求14所述的电池，其中，沿所述电路板的厚度方向，所述温度采集件在所述电路板上的投影与所述通道至少部分重叠。
  16. 根据权利要求1所述的电池，其中，所述第一电芯包括电芯本体和从所述电芯本体的端部延伸出的极耳，所述温度采集件设置于所述端部。
  17. 一种用电设备，包括根据权利要求1-16任一项所述的电池。
PCT/CN2022/096422 2022-05-31 2022-05-31 电池及用电设备 WO2023230900A1 (zh)

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JP2018029019A (ja) * 2016-08-18 2018-02-22 株式会社東芝 組電池
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