Buffer heat-insulating pad, battery module, battery pack, energy storage system, and electric device

Abstract

A buffer heat-insulating pad (100), a battery module (200), a battery pack (300), an energy storage system, and an electric device (400). A pad body (10) comprises a first body portion (11) and a second body portion (12); the first body portion (11) is arranged around the second body portion (12); at least one second body portion (12) is provided; the first body portion (11) and the second body portion (12) are made of the same material; and the compressive deformation capacity of the first body portion (11) is better than that of the second body portion (12).

Description

Buffer insulation pads, battery modules, battery packs, energy storage systems and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number "202420096163.3" filed by Contemporary Amperex Technology Co., Ltd. on January 15, 2024, entitled "Buffer and thermal insulation pad, battery module, battery pack, energy storage system and electrical device". Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a buffer and thermal insulation pad, a battery module, a battery pack, an energy storage system, and an electrical device. Background Art

[0004] In the related art, a buffer thermal insulation pad is arranged between the large surfaces of adjacent battery cells. The existing buffer thermal insulation pad reserves space for battery cell expansion to absorb the expansion of the battery cell through the expansion space and achieve heat barrier between adjacent battery cells, thereby improving safety, suppressing and delaying thermal runaway. However, the thermal insulation performance of the edge part and the middle area of ​​the buffer thermal insulation pad is quite different, resulting in poor thermal insulation performance of the frame part and poor thermal protection performance.

[0005] Utility Model Content

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a buffer insulation pad, a battery module, a battery pack, an energy storage system, and an electrical device, wherein the buffer insulation pad has better thermal insulation uniformity and better thermal protection performance.

[0007] A buffer and thermal insulation pad comprises: a pad body, the pad body comprising: a first body portion and a second body portion, the first body portion extending along a first direction, the first body portion being arranged around the second body portion, the second body portion being at least one, and in a second direction perpendicular to the first direction, the size of the first body portion is larger than the size of the second body portion; wherein the first body portion and the second body portion are made of the same material, and the compressive deformation capacity of the first body portion is better than the compressive deformation capacity of the second body portion.

[0008] Therefore, the first main body and the second main body are made of the same material, and the compressive deformation capacity of the first main body is better than that of the second main body. Both the first main body and the second main body have high thermal insulation effects, and the thermal insulation uniformity of the buffer thermal insulation pad is better, which can improve the thermal insulation effect between adjacent battery cells in the second direction, so as to delay the spread speed of thermal runaway, improve safety and reliability, and take into account the buffering protection effect of the buffer thermal insulation pad through the second main body with better compressive deformation capacity, improve the convenience of grouping, and improve the buffer space defined between the first main body and the second main body to improve the expansion force, relieve stress concentration, extend the service life of the battery cell, and improve safety and reliability.

[0009] According to some embodiments of the present application, the first body portion and the second body portion are integrally formed, and the second body portion is plastically deformed so that the size of the second body portion is smaller than the size of the first body portion in the second direction.

[0010] According to some embodiments of the present application, there are multiple second body portions, and the multiple second body portions are spaced apart in the first direction.

[0011] According to some embodiments of the present application, in the second direction, a proportional relationship between a size h1 of the first body portion and a size h2 of the second body portion satisfies: 0.05≤h2 / h1<1.

[0012] According to some embodiments of the present application, in the second direction, a proportional relationship between a size h1 of the first body portion and a size h2 of the second body portion satisfies: 0.1≤h2 / h1≤0.95.

[0013] According to some embodiments of the present application, the buffering and thermal insulation pad further includes: a membrane sealing layer, which is coated on the outside of the pad body.

[0014] According to some embodiments of the present application, in the second direction, the film sealing layer located on at least one side of the second body portion is spaced apart from the second body portion.

[0015] According to some embodiments of the present application, in the second direction, a dimension h3 of the film sealing layer satisfies: 0<h3≤0.1 mm.

[0016] According to some embodiments of the present application, in the second direction, a dimension h3 of the film sealing layer satisfies: 0.01 mm<w1≤0.05 mm.

[0017] According to some embodiments of the present application, the film sealing layer includes a core material and a wrapping layer, wherein the wrapping layer is coated on the core material.

[0018] According to some embodiments of the present application, the wrapping layer is constructed of any one of PET film, PI film, PP film, PC film, and PVC film.

[0019] According to some embodiments of the present application, the membrane sealing layer includes a core material and a coating layer, wherein the coating layer is coated on the core material.

[0020] A battery module comprises: at least one battery cell and the buffer and thermal insulation pad of the above embodiment. When there are multiple battery cells, in a first direction, the small battery surfaces of adjacent battery cells are opposite to each other, and in a second direction, the large battery surfaces of adjacent battery cells are opposite to each other; in the second direction, the buffer and thermal insulation pad is arranged between adjacent battery cells.

[0021] According to some embodiments of the present application, the ratio between the area S1 of the second body portion and the area S2 of the large surface of the battery satisfies: 0.7≤S1 / S2<1.

[0022] According to some embodiments of the present application, the ratio between the area S1 of the second body portion and the area S2 of the large surface of the battery satisfies: 0.8≤S1 / S2<1.

[0023] According to some embodiments of the present application, in the second direction, a ratio between a size h1 of the first body portion and a thickness h4 of the battery cell satisfies: 0.005≤h1 / h4≤0.2.

[0024] According to some embodiments of the present application, in the second direction, a ratio between a size h1 of the first body portion and a thickness h4 of the battery cell satisfies: 0.01≤h1 / h4≤0.15.

[0025] A battery pack includes the battery module of the above embodiment.

[0026] An energy storage system includes: the battery pack of the above embodiment.

[0027] An electrical device includes the battery pack of the above embodiment.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] FIG1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0031] FIG2 is a schematic diagram of a battery pack according to an embodiment of the present application;

[0032] FIG3 is a schematic diagram of the cooperation between a battery cell and a buffer pad at an angle according to an embodiment of the present application;

[0033] FIG4 is a schematic diagram showing the cooperation between a battery cell and a buffer pad at another angle according to an embodiment of the present application;

[0034] FIG5 is a schematic cross-sectional view of a battery cell and a buffer pad according to an embodiment of the present application;

[0035] FIG6 is a partial enlarged schematic diagram of the circled area A in FIG5 ;

[0036] FIG. 7 is a schematic diagram of another embodiment of the present application showing the cooperation between a buffer pad and a battery cell. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0039] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0042] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0044] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0045] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0046] The term "plurality" used in this application refers to two or more (including two).

[0047] In the embodiment of the present application, the battery cell 210 may be a secondary battery. A secondary battery refers to a battery cell 210 that can be recharged to activate active materials after being discharged and can be used continuously.

[0048] The battery cell 210 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application.

[0049] The battery pack 300 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 210 to provide higher voltage and capacity. When there are multiple battery cells 210, the multiple battery cells 210 are connected in series, in parallel, or in hybrid through a busbar.

[0050] In some embodiments, a plurality of battery cells 210 may be combined into a battery module 200 . That is, when there are a plurality of battery cells 210 , the plurality of battery cells 210 are arranged and fixed to form a battery module 200 .

[0051] In some embodiments, the battery pack 300 includes a case 700 and a battery cell 210 , at least one battery cell 210 or at least one battery module 200 is accommodated in the case 700 , and the case 700 has an accommodating space, and at least one battery cell 210 or at least one battery module 200 is accommodated in the accommodating space.

[0052] In some embodiments, the box 700 can be used as part of the chassis structure of the vehicle. For example, part of the box 700 can become at least a part of the floor of the vehicle, or part of the box 700 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0053] In some embodiments, the battery pack 300 or the battery module 200 may be part of an energy storage system, which may be an energy storage container, an energy storage cabinet, etc., in which batteries and energy shutdown modules are integrated.

[0054] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the safety performance of the battery also needs to be considered.

[0055] Understandably, since the energy people need is highly temporal and spatially dependent, rationally utilizing energy and improving its efficiency requires a medium or device that can store one form of energy in the same form or convert it into another, and then release it in a specific form based on future application needs. As we all know, achieving the goal of carbon neutrality currently relies primarily on replacing fossil energy with green energy to generate green electricity.

[0056] Current green energy sources mainly include solar energy, wind energy, and hydropower. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage in the green power grid (insufficient electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, insufficient electricity demand or insufficient grid acceptance capacity may cause the problem of "wind and solar power curtailment".

[0057] To address the issue of insufficient electricity demand or insufficient grid capacity, energy storage systems are essential. These systems convert electrical energy into other forms of energy through physical or chemical means, storing it. When needed, the stored energy is converted back into electricity and released. Simply put, an energy storage system acts like a large "power bank," storing electricity when there's sufficient solar or wind energy and releasing it when needed.

[0058] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding energy storage system types include:

[0059] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0060] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, they release the electricity in the energy storage equipment for use, so as to achieve the purpose of saving electricity bills. In addition, in remote areas, as well as areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage systems is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0061] In conjunction with the aforementioned physical or electrochemical energy storage, taking electrochemical energy storage as an example, the energy storage system can include at least one battery as described above, utilizing the chemical elements within the battery as the energy storage medium, with the charging and discharging process achieved through chemical reactions or changes in the energy storage medium. Simply put, the electricity generated by solar and wind energy is stored in at least one battery through chemical reactions or changes in the energy storage medium. When external power usage reaches a peak, the energy stored in the at least one battery is released through chemical reactions or changes in the energy storage medium for use, or transferred to areas with power shortages for use.

[0062] In summary, the battery cell 210 serves as the smallest energy unit of the battery module 200, the battery pack 300, and the energy storage system. The battery module 200 or the battery pack 300 includes multiple battery cells 210. The battery cell 210 includes a large battery surface defined by the width edge and the length edge of the battery cell 210, a small battery surface defined by the width edge and the height edge, and a battery end surface defined by the length edge and the width edge. The battery cell 210 will expand during the charging and discharging process. A buffer insulation pad 100 needs to be set between the large battery surfaces of adjacent battery cells 210. The buffer insulation pad 100 provides a buffer space to improve the stress concentration and excessive expansion force generated during the charging and discharging process of the battery cell, thereby slowing down the cycle attenuation rate of the battery cell 210.

[0063] However, the existing buffer insulation pad 100 adopts a frame grouping form, that is, an inner core is arranged inside the frame, and the thickness difference between the inner core and the frame defines a buffer space, which is used to buffer the expansion force of the battery cell 210 and improve the stress concentration problem. The inner core is used for heat insulation, and the heat insulation performance of the frame part is poor, and the thermal protection performance is poor, which makes it difficult to suppress and delay thermal runaway. The inner core and the frame are grouped, and the overall cost is also high.

[0064] In view of this, an embodiment of the present application provides a buffering and thermally insulating pad 100, in which the difference in thermal insulation performance between the first main body portion 11 and the second main body portion 12 of the buffering and thermally insulating pad 100 is smaller, and the buffering performance of the first main body portion 11 can be taken into account, so that the cost of the buffering and thermally insulating pad 10 is lower, and the thermal insulation effect is good and the thermal protection performance is high.

[0065] The technical solutions described in the embodiments of the present application are applicable to the battery pack 300 and the electrical device 400 using the battery pack 300 .

[0066] The electrical device 400 can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. A vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. A new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The present embodiment of the application does not impose any special restrictions on the above-mentioned electrical device 400.

[0067] For the convenience of description, the following embodiments are described by taking the electric device 400 as a vehicle as an example.

[0068] Referring to the figures, Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application. A battery pack 300 is disposed within the vehicle, and can be located at the bottom, front, or rear of the vehicle. Battery pack 300 can be used to power the vehicle, for example, as the vehicle's operating power source.

[0069] The vehicle may further include a controller 500 and a motor 600 . The controller 500 is used to control the battery pack 300 to supply power to the motor 600 . The motor 600 serves as a load, for example, to meet the power requirements for starting, navigating, and driving the vehicle.

[0070] In some embodiments of the present application, the battery pack 300 can not only serve as the operating power source of the vehicle, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0071] 2 is an exploded view of a battery pack 300 according to some embodiments of the present invention. The battery pack 300 includes a battery module 200 and a box 700 , wherein the box 700 is used to accommodate the battery module 200 .

[0072] The housing 700 is a component that houses the battery module 200. The housing 700 provides storage space for the multiple battery cells 210 within the battery module 200. The housing 700 can have a variety of structures. In some embodiments, the housing 700 can include a tray and the housing 700, which cover the tray and the housing 700 to define a storage space for the battery cells 210. The tray and the housing 700 can have a variety of shapes, such as a rectangular parallelepiped, a cylinder, etc. The tray can be a hollow structure with one side open, and the housing 700 can also be a hollow structure with one side open. The open side of the housing 700 covers the open side of the tray, forming the housing 700 with storage space. Alternatively, the tray can be a hollow structure with one side open, and the housing 700 can be a plate-like structure. The housing 700 covers the open side of the tray, forming the housing 700 with storage space. As an example, the battery cell 210 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, which is not particularly limited in the present application.

[0073] In the battery pack 300, there can be one or more battery cells 210. If there are multiple battery cells 210, the multiple battery cells 210 can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 210. Multiple battery cells 210 can be connected in series, parallel, or in a hybrid configuration to form a battery module 200. The multiple battery modules 200 can then be connected in series, parallel, or in a hybrid configuration to form a single unit and housed within the housing 700. Alternatively, all battery cells 210 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire unit formed by all battery cells 210 can be housed within the housing 700.

[0074] The following describes a buffer and thermal insulation pad 100, a battery module 200, a battery pack 300, an energy storage system, and an electrical device 400 according to an embodiment of the present application with reference to Figures 1 to 6.

[0075] An embodiment of the present application provides a buffering and thermal insulation pad 100 , including: a pad body 10 .

[0076] As shown in Figures 3 and 4, the pad body 10 includes: a first body portion 11 and a second body portion 12. The first body portion 11 extends along a first direction and is arranged around the second body portion 12. There is at least one second body portion 12. In a second direction perpendicular to the first direction, the size of the first body portion 11 is larger than the size of the second body portion 12.

[0077] The first direction involved in the embodiment of the present application may be the length direction of the battery cell 210 , and the second direction may be the width direction of the battery cell 210 .

[0078] The first main body portion 11 extends along the first direction and can be arranged corresponding to the battery cells 210 opposite to each other in the second direction to separate the battery cells 210 opposite to each other in the second direction, thereby realizing thermal runaway protection and expansion force buffering for the adjacent battery cells 210 in the second direction. The projection outline of the second main body portion 12 in the second direction is located within the projection outline of the first main body portion 11 in the second direction. The first main body portion 11 is arranged corresponding to at least part of the edge of the second main body portion 12. If the second main body portion 12 is circular, the first main body portion 11 can be constructed as a ring or semi-ring lamp. If the second main body portion 12 is rectangular, the first main body portion 11 can be arranged to surround at least one edge of the second main body portion 12.

[0079] The dimension of the first main body portion 11 in the second direction is greater than the dimension of the second main body portion 12 in the second direction, that is, the thickness dimension of the first main body portion 11 is greater than the thickness dimension of the second main body portion 12, so as to define a buffer space. In some embodiments, the first main body portion 11 and the second main body portion 12 can be edge-aligned in the second direction to define a buffer space. In other embodiments, the first main body portion 11 and the second main body portion 12 can be center-aligned in the second direction to define two buffer spaces.

[0080] The first body portion 11 and the second body portion 12 are made of the same material. The compression deformation capability of the first body portion 11 is better than that of the second body portion 12 .

[0081] The compressive deformation capacity of the first main body portion 11 is better than that of the second main body portion 12. It is used to absorb tolerances during the grouping process of multiple battery cells 210, and can provide impact protection between adjacent battery cells 210, thereby improving the convenience of grouping. The second main body portion 12 and the first main body portion 11 are made of the same material, which makes the difference in thermal insulation performance between the two smaller, and can increase the thermal insulation area of ​​the buffer insulation pad 100, improve the technical problem of poor thermal insulation effect in the edge area of ​​the buffer insulation pad 100, and make the buffer insulation pad 100 have better insulation uniformity and higher thermal protection performance.

[0082] The compressive deformation capacity referred to in this application refers to the ability of the buffer insulation pad 100 to deform in the second direction after being subjected to pressure. The better the compressive deformation capacity, the greater the deformation amount during the pressure process, and the worse the compressive deformation capacity, the smaller the deformation amount during the pressure process. Better compressive deformation capacity enables the first main body part 11 to deform better to absorb assembly tolerances, has lower requirements for assembly accuracy, corresponds to lower grouping difficulty, and higher grouping convenience.

[0083] According to the buffer thermal insulation pad 100 of the embodiment of the present application, the first main body portion 11 and the second main body portion 12 are made of the same material, and the compressive deformation capacity of the first main body portion 11 is better than the compressive deformation capacity of the second main body portion 12. Both the first main body portion 11 and the second main body portion 12 have high thermal insulation effects. The buffer thermal insulation pad 100 has better thermal insulation uniformity, which can improve the thermal insulation effect between adjacent battery cells 210 in the second direction, and has better thermal protection performance to delay the spread speed of thermal runaway and improve safety and reliability. Through the second main body portion 12 with better compressive deformation capacity, the buffering protection effect of the buffer thermal insulation pad 100 is taken into account, and the convenience of grouping is improved. Through the buffer space defined between the first main body portion 11 and the second main body portion 12, the expansion force is improved, stress concentration is relieved, the service life of the battery cell 210 is extended, and the safety and reliability are improved.

[0084] The first main body portion 11 and the second main body portion 12 are made of the same material, and the thermal insulation effects of the first main body portion 11 and the second main body portion 12 are closer. The setting of the buffer space can absorb the expansion of the battery cell 210, improve the stress concentration and excessive expansion force of the battery cell 210, reduce the cycle attenuation rate of the battery cell 210, extend the service life of the battery cell 210, and improve the safety of use. The second main body portion 12 is less deformed under pressure and the thermal insulation performance is less reduced, which can improve the thermal insulation stability and reliability.

[0085] There are multiple second body parts 12 , and the multiple second body parts 12 are spaced apart in the first direction.

[0086] In some embodiments, a buffer insulation pad 100 is provided corresponding to a pair of battery cells 210, that is, a buffer insulation pad 100 is provided between a pair of battery cells 210 opposite to each other in the second direction (see FIG7 ). In other embodiments, there may be two columns of battery cells 210 in the first direction, the small battery surfaces of the two columns of battery cells 210 are opposite to each other in the first direction, the large battery surfaces of the two columns of battery cells 210 are opposite to each other in the second direction, and a buffer insulation pad 100 is provided between the two columns of battery cells 210 (see FIG3 and FIG4 ). Not only can the buffer insulation pad 100 be used to buffer the expansion force and provide thermal runaway protection between adjacent battery cells 210 in the second direction, but also in the first direction, multiple battery cells 210 can share one insulation buffer pad 100, resulting in fewer assembly steps, lower difficulty in grouping the battery cells 210, and higher convenience in grouping.

[0087] As shown in FIG. 6 , according to some embodiments of the present application, the second body portion 12 is plastically deformed so that the size of the second body portion 12 is smaller than the size of the first body portion 11 in the second direction.

[0088] In the prior art, the frame part (corresponding to the first main body part 11) and the middle part (corresponding to the second main body part 12) of the buffer insulation pad 100 are split structures and made of different materials. The different materials require further assembly of the frame part and the middle part, resulting in a high overall cost. In addition, the thermal insulation performance of the frame part and the middle part is quite different, and the thermal insulation effect of the frame part is poor.

[0089] The first main body 11 and the second main body 12 of the present application are made of the same material, and the first main body 11 and the second main body 12 are integrally formed, which can save the assembly cost of further assembly to reduce the grouping cost of the buffer insulation pad 100. At the same time, the second main body 12 and the first main body 11 can be formed into a large plate, and plastic processing is performed on the middle area of ​​the large plate to cause at least part of the large plate to produce plastic deformation. The original thickness of the plastic deformation area is consistent with the original thickness of the non-plastic deformation area, and the thermal insulation performance of the two is more uniform. The density of the plastic deformation area is greater than the density of the non-plastic deformation area, which can give the first main body 11 and the second main body 12 different compressive deformation capabilities, so that the first main body 11 that can achieve greater deformation can effectively absorb assembly tolerances and reduce the difficulty of grouping the battery cell 210. The second main body 12 with smaller deformation ensures the thermal insulation performance of the area where the buffer space is located.

[0090] By integrally molding the first main body portion 11 and the second main body portion 12 and processing the second main body portion 12 through plastic deformation, the molding difficulty of the buffer thermal insulation pad 100 can be simplified, the cost of the buffer thermal insulation pad 100 can be reduced, and the thermal insulation performance of the first main body portion 11 and the second main body portion 12 can be made more consistent and have a better thermal insulation effect, thereby improving the thermal protection performance of the buffer thermal insulation pad 100.

[0091] In other embodiments, the first main body portion 11 and the second main body portion 12 are made of the same material, but are constructed as a split structure. The density of the corresponding second main body portion 12 is higher than that of the first main body portion 11, and the pad body 10 can be made of gel felt, fiber felt, aerogel powder mixture, etc., and this application does not impose specific restrictions.

[0092] 6 , according to some embodiments of the present application, in the second direction, a proportional relationship between a size h1 of the first body portion 11 and a size h2 of the second body portion 12 satisfies: 0.05≤h2 / h1<1.

[0093] Exemplarily, the ratio between the size h1 of the first main body portion 11 and the size h2 of the second main body portion 12 can be 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc., and both the first main body portion 11 and the second main body portion 12 can produce elastic deformation, or only the first main body portion 11 can produce elastic deformation to absorb the assembly tolerance during the grouping process of the battery cells 210, and the first main body portion 11 can provide impact protection. The larger the value of h2 / h1, the smaller the size difference between the first main body portion 11 and the second main body portion 12 in the second direction, and the smaller the value of h2 / h1, the greater the size difference between the first main body portion 11 and the second main body portion 12 in the second direction.

[0094] By making the size ratio of the first main body portion 11 and the second main body portion 12 less than 1, the first main body portion 11 can have at least a certain buffer space compared to the second main body portion 12 for tolerance absorption, and the size ratio between the first main body portion 11 and the second main body portion 12 is greater than or equal to 0.05, the thickness of the second main body portion 12 is more reasonable, and while the first main body portion 11 has a better size tolerance absorption effect, the thermal insulation performance of the second main body portion 12 can be taken into account.

[0095] According to some embodiments of the present application, in the second direction, a proportional relationship between a size h1 of the first body portion 11 and a size h2 of the second body portion 12 satisfies: 0.1≤h2 / h1≤10.95.

[0096] The ratio between the size h1 of the first main body portion 11 and the size h2 of the second main body portion 12 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc. For example, if the thickness of the first main body portion 11 is 10 mm, the thickness of the second main body portion 12 ranges from 1 mm to 9.5 mm.

[0097] The size difference between the first main body portion 11 and the second main body portion 12 ranges from 0.5mm to 9mm. The first main body portion 11 has an error absorption capacity of at least about 0.5mm, has better tolerance absorption capacity, and is more effective in reducing the difficulty of grouping the battery cells 210. The minimum thickness of the second main body portion 12 is 1mm, so as to take into account the heat barrier effect between the two battery cells 210 relative to each other in the second direction, and has higher thermal insulation stability.

[0098] As shown in FIG. 5 and FIG. 6 , according to some embodiments of the present application, the buffer and thermal insulation pad 100 further includes: a film sealing layer 13 , which is coated on the outside of the pad body 10 .

[0099] The membrane sealing layer 13 can separate the pad body 10 from the outside world to delay corrosion and aging of the pad body 10, extend the service life of the buffer insulation pad 100, reduce the powder and slag phenomenon after the pad body 10 is damaged, and improve the structural strength and stability of the buffer insulation pad 100.

[0100] As shown in FIG. 6 , according to some embodiments of the present application, in the second direction, the film sealing layer 13 located on at least one side of the second body portion 12 is spaced apart from the second body portion 12 .

[0101] In an embodiment where the first main body portion 11 and the second main body portion 12 are centrally aligned in the second direction, the membrane sealing layer 13 on both sides in the second direction are spaced apart from the second main body portion 12 to define two buffer spaces. In an embodiment where the first main body portion 11 and the second main body portion 12 are edge-aligned in the second direction, the membrane sealing layer 13 on one side in the second direction is spaced apart from the second main body portion 12, and the membrane sealing layer 13 on the other side in the second direction is fitted with the second main body portion 12.

[0102] When the battery cell 210 expands, the membrane sealing layer 13 is compressed first. While the membrane sealing layer 13 initially suppresses the expansion force, it deforms into the buffer space. While improving the buffering effect and expansion force suppression effect of the buffer insulation pad 100, it can also avoid scratches on the second main body 12, thereby extending the service life and reliability of the buffer insulation pad 100.

[0103] As shown in FIG. 6 , according to some embodiments of the present application, in the second direction, a dimension h3 of the film sealing layer 13 satisfies: 0<h3≤0.1 mm.

[0104] Illustratively, the size of the membrane sealing layer 13 may be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc.

[0105] The size of the film sealing layer 13 is made more reasonable to take into account the energy density of the battery cells 210 after grouping and the structural stability of the buffer and thermal insulation pad 100.

[0106] According to some embodiments of the present application, in the second direction, a dimension h3 of the film sealing layer 13 satisfies: 0.01 mm<w1≤0.05 mm.

[0107] The size of the film sealing layer 13 can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, etc. A smaller thickness of the film sealing layer 13 can make the energy density of the battery cells 210 after grouping higher.

[0108] According to some embodiments of the present application, the film sealing layer 13 includes a core material and a wrapping layer, wherein the wrapping layer is coated on the core material.

[0109] The core material can be a supporting structure with a certain rigidity, while the wrapping layer is made of a flexible material with good sealing and corrosion resistance.

[0110] In this way, the structural strength of the buffer insulation pad 100 can be improved through the core material, and the corrosion resistance and sealing performance of the buffer insulation pad 100 can be improved through the wrapping layer, so as to increase the service life of the buffer insulation pad 100.

[0111] According to some embodiments of the present application, the wrapping layer is constructed of any one of PET (Polyethylene terephthalate, polyester resin) film, PI (Polyimide, polyimide) film, PP (polypropylene) film, PC (Polycarbonate, polycarbonate) film, and PVC (Polyvinylchlorid, polyvinyl chloride) film.

[0112] In the embodiment where the membrane sealing layer 13 includes a core material and a wrapping layer, the wrapping layer can be made of the above-mentioned polymer material film, so that the membrane sealing layer 13 can have properties such as high temperature resistance, puncture resistance, and corrosion resistance, thereby improving the buffering effect, heat insulation effect, and support and protection effect of the buffering and thermal insulation pad 100.

[0113] In other embodiments, the membrane sealing layer 13 may further include a core material and a coating layer, wherein the coating layer is coated on the core material.

[0114] The coating film can be constructed as a polymer material coating and coated on the core material to form a coating layer of a certain thickness outside the core material. The thickness of the coating layer is less than or equal to 0.05 mm. It can also make the membrane sealing layer 13 have excellent physical properties such as high temperature resistance, puncture resistance, and corrosion resistance, thereby improving the stability and reliability of the buffer insulation pad 100.

[0115] An embodiment of the present application provides a battery module 200, comprising: at least one battery cell 210 and the buffer and thermal insulation pad 100 of the above embodiment. When there are multiple battery cells 210, in the first direction, the small battery surfaces of adjacent battery cells 210 are opposite to each other, and in the second direction, the large battery surfaces of adjacent battery cells 210 are opposite to each other; in the second direction, the buffer and thermal insulation pad 100 is arranged between adjacent battery cells 210.

[0116] The battery module 200 may include multiple battery cells 210, which are arranged in rows in the first direction and in columns in the second direction. The small faces of the multiple battery cells 210 in each row are opposite to each other, and a buffer insulation pad 100 is arranged between adjacent rows of battery cells 210 (that is, each column of battery cells 210). The buffer insulation pad 100 can be constructed as a large pad body and extend along the first direction so that one buffer insulation pad 100 can be arranged corresponding to two adjacent rows of multiple battery cells 210 in the first direction.

[0117] According to the battery module 200 of the embodiment of the present application, under the premise of having the same technical effect as the above-mentioned buffer insulation pad 100, multiple battery cells 210 can share the same buffer insulation pad 100. While improving the production of the buffer insulation pad 100, it can also improve the grouping efficiency of the battery module 200, reduce the cost of the battery module 200, and improve the energy density, safety and reliability of the battery module 200.

[0118] According to some embodiments of the present application, the ratio of the area S1 of the second body portion 12 to the area S2 of the large surface of the battery satisfies: 0.7≤S1 / S2<1.

[0119] For example, the ratio of the area of ​​the second main body 12 to the area of ​​the large surface of the battery is 0.7, 0.8, 0.9, etc., so that the area relative to the large surface of the battery of the second main body 12 is more reasonable, which can further improve the heat insulation effect, and the area of ​​the buffer space used to buffer the expansion force of the battery cell 210 can also be larger, and the expansion force suppression and stress concentration improvement effects are also better.

[0120] According to some embodiments of the present application, the ratio of the area S1 of the second body portion 12 to the area S2 of the large surface of the battery satisfies: 0.8≤S1 / S2<1.

[0121] The area ratio of the second main body part 12 to the large surface of the battery is 0.8, 0.9, etc. The size of the first main body part 11 in the third direction (height direction) and the size in the first direction can be set smaller. The size of the second main body part 12, which is mainly used for heat insulation and expansion force buffering, can be larger, corresponding to better heat insulation and expansion force buffering effects.

[0122] 5 and 6 , according to some embodiments of the present application, in the second direction, a ratio between a size h1 of the first body portion 11 and a thickness h4 of the battery cell 210 satisfies: 0.005≤h1 / h4≤0.2.

[0123] Exemplarily, the ratio of the thickness of the first main body 11 to the thickness of the battery cell 210 is 0.005, 0.1, 0.2, etc. In this way, the thickness of the buffer insulation pad 100 is more reasonable, taking into account the buffer support effect, thermal insulation effect and space occupancy of the buffer insulation pad 100, so that the space occupancy of the buffer insulation pad 100 is more reasonable, so that the energy density of the battery module 200 can be higher.

[0124] According to some embodiments of the present application, in the second direction, a ratio between a size h1 of the first body portion 11 and a thickness h4 of the battery cell 210 satisfies: 0.01≤h1 / h4≤0.15.

[0125] For example, the thickness of the battery cell 210 is 100 mm, corresponding to a thickness range of 1 mm to 15 mm for the buffer and thermal insulation pad 100. This allows for a more reasonable thickness for the buffer and thermal insulation pad 100, providing better support, insulation, and cushioning. This reduces the space occupied by the buffer and thermal insulation pad 100, allowing for a higher energy density for the battery module 200.

[0126] An embodiment of the present application provides a battery pack 300 , including: the battery module 200 of the above embodiment.

[0127] An embodiment of the present application provides an energy storage system, including: the battery pack 300 of the above embodiment.

[0128] An embodiment of the present application provides an electric device 400 , comprising: the battery pack 300 of the above embodiment.

[0129] According to the buffer and thermal insulation pad 100 of the embodiment of the present application, the pad body 10 includes a first body portion 11 located at the peripheral edge and having a larger thickness, and a second body portion 12 located in the middle area and having a smaller thickness. The first body portion 11 and the second body portion 12 are integrally formed, and the second body portion 12 is plastically deformed compared to the first body portion 11, so that the compressive deformation capacity of the second body portion 12 is worse than that of the first body portion 11, such as: hot pressing plastic deformation.

[0130] The compressive deformation capacity of the second main body part 12 is better than that of the second main body part 12, and the compression rate of the first main body part 11 under grouping is better than that of the second main body part 12. In the process of grouping multiple battery cells 210, the assembly tolerance can be absorbed and the convenience of grouping can be improved. The first main body part 11 and the second main body part 12 are made of the same material, with a larger insulation area, higher insulation performance, and better thermal protection effect.

[0131] Other structures and operations of the buffer and thermal insulation pad 100, battery module 200, battery pack 300, energy storage system and electrical device 400 according to the embodiment of the present application are known to ordinary technicians in this field and will not be repeated here.

[0132] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0133] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A buffer heat insulation pad, wherein, Comprising: A pad body (10), the pad body (10) comprising: a first body portion (11) and a second body portion (12), the first body portion (11) extending in a first direction, the first body portion (11) surrounding the second body portion (12), the second body portion (12) being at least one, and in a second direction perpendicular to the first direction, the size of the first body portion (11) being greater than the size of the second body portion (12); wherein The first body portion (11) and the second body portion (12) are made of the same material, and the pressure-deformation ability of the first body portion (11) is superior to that of the second body portion (12).

2. The buffer heat insulation pad according to claim 1, wherein, The first body portion (11) and the second body portion (12) are integrally formed, and the second body portion (12) undergoes plastic deformation so that in the second direction, the size of the second body portion (12) is smaller than the size of the first body portion (11).

3. The buffer heat insulation pad according to claim 1 or 2, wherein, The second body portion (12) is multiple, and the multiple second body portions (12) are spaced apart in the first direction.

4. The buffer heat insulation pad according to any one of claims 1-3, wherein, In the second direction, the proportional relationship between the size h1 of the first body portion (11) and the size h2 of the second body portion (12) satisfies: 0.05 ≤ h2 / h1 < 1.

5. The buffer heat insulation pad according to claim 4, wherein, In the second direction, the proportional relationship between the size h1 of the first body portion (11) and the size h2 of the second body portion (12) satisfies: 0.1 ≤ h2 / h1 ≤ 0.

95.

6. The buffer heat insulation pad according to any one of claims 1-5, wherein, The buffer heat-insulating pad further comprises: a film sealing layer (13), and the film sealing layer (13) covers the outside of the pad body (10).

7. The buffer heat insulation pad according to claim 6, wherein In the second direction, the film sealing layer (13) on at least one side of the second body portion (12) is spaced apart from the second body portion (12).

8. The buffer heat insulation pad according to claim 6, wherein, In the second direction, the size h3 of the film sealing layer (13) satisfies: 0 < h3 ≤ 0.1 mm.

9. The buffer heat insulation pad according to claim 8, wherein, In the second direction, the size h3 of the film sealing layer (13) satisfies: 0.01 mm < w1 ≤ 0.05 mm.

10. The buffer heat insulation pad according to any one of claims 7-9, wherein, The film sealing layer (13) comprises a core material and a wrapping layer, and the wrapping layer wraps the core material.

11. The buffer heat insulation pad according to claim 10, wherein, The wrapping layer is configured as any one of a PET film, a PI film, a PP film, a PC film, and a PVC film.

12. The buffer heat insulation pad according to any one of claims 7-9, wherein, The film sealing layer (13) comprises a core material and a coating layer, and the coating layer is coated on the core material.

13. A battery module, wherein, Comprising: At least one battery cell (210), when there are multiple battery cells (210), in the first direction, the battery small faces of adjacent battery cells (210) face each other, and in the second direction, the battery large faces of adjacent battery cells (210) face each other; The buffer heat-insulating pad according to claims 1-12, in the second direction, the buffer heat-insulating pad is disposed between adjacent battery cells (210).

14. The battery module according to claim 13, wherein, The proportional relationship between the area S1 of the second body portion (12) and the area S2 of the battery large face satisfies: 0.7 ≤ S1 / S2 < 1.

15. The battery module according to claim 14, wherein, The proportional relationship between the area S1 of the second body portion (12) and the area S2 of the battery large face satisfies: 0.8 ≤ S1 / S2 < 1.

16. The battery module according to claim 14 or 15, wherein, In the second direction, the ratio between the dimension h1 of the first body portion (11) and the thickness h4 of the battery cell (210) satisfies: 0.005 ≤ h1 / h4 ≤ 0.

2.

17. The battery module according to claim 16, wherein, In the second direction, the ratio between the dimension h1 of the first body portion (11) and the thickness h4 of the battery cell (210) satisfies: 0.01 ≤ h1 / h4 ≤ 0.

15.

18. A battery pack, wherein, Comprising: The battery module according to claims 13-17.

19. A energy storage system, wherein, Comprising: The battery pack according to claim 18.

20. An electrical device, wherein, Comprising: The battery pack according to claim 18.

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