Battery and electric device

Abstract

The utility model provides a battery and an electric device. The battery comprises a plurality of battery monomers, wherein an isolation structure is arranged between at least two adjacent battery monomers; the isolation structure comprises a heat insulation layer and a protection layer arranged on the peripheral side of the heat insulation layer, and the protection layer comprises a thermoplastic elastomer. According to the battery provided by the invention, the isolation structure is introduced, so that the capacity and the safety performance of the battery are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of secondary batteries, in particular to a battery and a power consumption device. BACKGROUND

[0002] In recent years, the application range of secondary batteries such as lithium ion batteries is more and more extensive, which has been widely applied in energy storage power supply systems such as hydraulic, thermal, wind and solar power stations, and many fields such as electric tools, electric bicycles, electric motorcycles, electric vehicles. Due to the great development of secondary batteries, higher requirements are put forward for their energy density, cycle performance and safety performance. At present, the battery monomer is prone to lithium precipitation after being packed, which affects the capacity of the battery. CONTENT OF THE UTILITY MODEL

[0003] In order to achieve the above purpose, the first aspect of the present application provides a battery, comprising:

[0004] a plurality of battery monomers, at least two adjacent battery monomers are provided with an isolation structure;

[0005] The isolation structure comprises a heat insulation layer and a protective layer arranged on the outer circumferential side of the heat insulation layer, and the protective layer comprises a thermoplastic elastomer.

[0006] In the battery provided by the present application, at least two battery monomers are provided with an isolation structure. In the isolation structure, the heat insulation layer undertakes the function of heat insulation, which can reduce the probability of thermal runaway of the whole battery caused by the thermal runaway of the battery monomer. The protective layer is made of thermoplastic elastomer, which is used to bond the battery monomers on both sides, has good buffering performance, can be deformed under pressure, can rebound after unloading, can absorb the thickness tolerance of the battery monomer, and can adapt to the compression deformation and expansion rebound demand of the battery monomer in the charging and discharging process. In the assembly process of the battery, the protective layer can block the adhesive at the bottom from overflowing between the two opposite sides of the battery monomer, which can not only reduce the stress concentration problem of the battery monomer and promote the volatilization of the battery capacity, but also reduce the influence of the adhesive on the heat insulation layer, thereby improving the safety performance of the battery. In addition, the heat insulation layer and the protective layer can be designed separately to adapt to the different needs of different models of battery monomers for heat insulation performance and buffering performance, and the thickness, size, coverage area and other structural characteristics of the heat insulation layer and the protective layer can be flexibly adjusted in the assembly process of the battery, thereby effectively improving the safety performance of the battery.

[0007] In some embodiments, the thickness of the protective layer is not less than the thickness of the heat insulation layer. In this way, the protective layer can provide good buffering and protection effect while bonding the battery monomers on both sides.

[0008] In some embodiments, the thickness of the protective layer is greater than the thickness of the thermal insulation layer. In this way, a certain space is reserved between the battery cell and the thermal insulation layer, which can reduce the influence of the volume shrinkage and expansion of the battery cell on the thermal insulation layer during the charging and discharging cycle, effectively reduce the heat transfer between adjacent battery cells, further improve the buffering performance and thermal insulation performance, and further improve the safety performance of the battery.

[0009] In some embodiments, at least one surface of the thermal insulation layer is provided with an adhesive layer, and the thermal insulation layer is bonded to the battery cell through the adhesive layer. In this way, the adhesion between the isolation structure and the battery cell can be improved, and the adhesive layer can also provide certain buffering and thermal insulation effects, so that the safety performance of the battery is further improved.

[0010] In some embodiments, the opposite surfaces of the adjacent battery cells are large surfaces, and the isolation structure is located between the opposite large surfaces of the two adjacent battery cells. In this way, the isolation structure is arranged between the large surfaces of the battery cells, and better bonding, buffering and thermal insulation effects can be obtained.

[0011] In some embodiments, the large surface has two opposite side edges, a bottom edge and a top edge, and the protective layer is arranged around part of the bottom edge and at least two side edges. In this way, the protective layer can provide good buffering and protection effects, effectively preventing the adhesive in the battery shell from penetrating between the battery cells.

[0012] In some embodiments, the protective layer is arranged around the two side edges, the bottom edge and the top edge of the large surface to form a closed structure with a hollow region in the middle, and the thermal insulation layer is located in the hollow region. In this way, the closed structure formed by the protective layer has a larger coverage area, which can provide better buffering and protection effects, prevent the adhesive or other impurities from entering between the adjacent battery cells, and reduce the limitation on the expansion space of the battery cells, thereby promoting the capacity of the battery cells.

[0013] In some embodiments, the center region of the battery cell is located in the hollow region. In this way, the isolation structure provides better thermal insulation and buffering effects for the center region of the battery cell.

[0014] In some embodiments, the area ratio of the isolation structure to the large surface is 50% to 110%. In this way, the coverage area of the isolation structure on the large surface can be flexibly adjusted according to the performance requirements of the battery and the amount of adhesive used in the actual construction process.

[0015] In some embodiments, the isolation structure covers the entire large surface. In this way, the buffering and protection effects of the battery cell are particularly prominent.

[0016] In some embodiments, the thickness of the protective layer is 0.1mm-10mm. In this way, the protective layer has excellent cushioning and protection performance, while also saving the internal space of the battery, thereby improving the energy density of the battery.

[0017] In some embodiments, the minimum width of the protective layer is 0.1mm-10mm. In this way, the cushioning and protection effect of the protective layer is particularly outstanding.

[0018] In some embodiments, the thickness of the thermal insulation layer is 0.1mm-5mm. In this way, good thermal insulation performance can be provided, while also saving the internal space of the battery, thereby improving the energy density of the battery.

[0019] In some embodiments, the area ratio of the thermal insulation layer to the large face is 50%-100%. In this way, the ratio of the coverage area of the thermal insulation layer and the protective layer can be adjusted, thereby taking into account good thermal insulation performance and cushioning performance.

[0020] In some embodiments, the distance between the outer edge of the hollowed-out area and the outer edge of the battery monomer is ≤20mm. In this way, good cushioning and protection effects can be provided while saving raw materials and reducing the cost of preparing the battery.

[0021] In some embodiments, the thermoplastic elastomer includes at least one of a styrene-based thermoplastic elastomer, an olefin-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, a polyester-based thermoplastic elastomer, and a polyamide-based thermoplastic elastomer; the styrene-based thermoplastic elastomer includes at least one of a styrene-butadiene-styrene triblock copolymer, a hydrogenated styrene-butadiene-styrene triblock copolymer, a styrene-isoprene-styrene triblock copolymer, and a hydrogenated styrene-isoprene-styrene triblock copolymer; and the olefin-based thermoplastic elastomer includes at least one of an ethylene-vinyl acetate copolymer and an ethylene-ethyl acrylate copolymer. In this way, the protective layer is made of the above-mentioned thermoplastic elastomer, has high adhesive strength, and excellent cushioning performance, can compress and deform when the battery monomer expands, and can expand and rebound when the battery monomer shrinks, thereby effectively improving the safety performance of the battery.

[0022] In some embodiments, the thermal insulation layer includes a thermal insulation core layer and a protective layer disposed on at least one surface of the thermal insulation core layer, and the thermal insulation core layer includes at least one of an aerogel thermal insulation layer and a mica thermal insulation layer. In this way, the thermal insulation core layer can provide excellent thermal insulation performance, and the protective layer can provide physical protection for the thermal insulation core layer, reduce the damage to the thermal insulation core layer when the volume of the battery monomer expands, and improve the stability of the thermal insulation performance.

[0023] In some embodiments, the battery further comprises a housing, and the plurality of battery cells are arranged in the housing, and at least one of the battery cells and the housing are provided with the isolation structure as described above. In this way, the heat insulation performance and the buffering performance of the battery as a whole can be improved.

[0024] The second aspect of the present application provides a power consuming device. The power consuming device comprises the battery. In this way, the electrical performance and the safety performance of the power consuming device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] For better describing and illustrating the embodiments or examples provided by the present application, one or more drawings can be referred to. The additional details or examples used for describing the drawings should not be considered as limiting the scope of any one of the disclosed applications, the presently described embodiments or examples, and the best mode of these applications presently understood. Moreover, the same reference numerals are used to denote the same components throughout the drawings. In the drawings:

[0026] Figure 1 A schematic view of a battery according to an embodiment of the present application.

[0027] Figure 2 A schematic view of a battery according to an embodiment of the present application. Figure 1 An exploded view of the battery shown.

[0028] Figure 3 A schematic view of a battery cell according to an embodiment of the present application.

[0029] Figure 4 An exploded view of the battery cell shown. Figure 3

[0030] A schematic view of a battery cell according to an embodiment of the present application. Figure 5

[0031] A schematic view of a battery cell according to an embodiment of the present application. Figure 6

[0032] A schematic view of a battery cell according to an embodiment of the present application. Figure 7

[0033] A schematic view of a battery cell according to an embodiment of the present application. Figure 8

[0034] A schematic view of a battery cell according to an embodiment of the present application. Figure 9 BRIEF DESCRIPTION OF DRAWINGS

[0035]

[0036] ​1. battery cell; 11. housing; 12. electrode assembly; 13. cover plate; 2. isolation structure; 21. thermal insulation layer; 211. thermal insulation core layer; 212. protective layer; 22. protective layer; 22a, protective layer; 22b, protective layer; 23, adhesive layer; 3, battery; 4, electric device. DETAILED DESCRIPTION

[0037] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways from those described herein without departing from the scope of the present application. It is therefore intended that the present application not be limited to the embodiments disclosed for purposes by way of example only. It is also possible that one or more aspects of the present application can be implemented only with respect to some embodiments but not with respect to other embodiments. Therefore, the description is intended for purposes of illustration only and not for purposes of limiting the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0041] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "installation", "connection", "connection", "fixation" and the like, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless specifically defined otherwise, if there is a description of the first feature "on" or "below" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is less than the second feature in horizontal height.

[0043] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0044] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also expected. Furthermore, if minimum range values ​​1 and 2 are listed, and if maximum range values ​​3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0045] In this application, the terms "multiple" or "various" are used unless otherwise specified, referring to a quantity greater than or equal to 2. For example, "one or more" means one or more types.

[0046] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment or implementation of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. The term "implementation" as used herein has a similar understanding.

[0048] In this application, "optionally," "optionally," and "optional" mean that something is optional, that is, it means that it is selected from either "with" or "without." If there are multiple "optional" entries in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "optional" entry shall be independent.

[0049] like Figure 1 and Figure 2 As shown, one embodiment of this application provides a battery 3, which includes a plurality of battery cells 1.

[0050] In this application, unless otherwise specified, a battery cell 1 refers to a basic unit capable of converting chemical energy into electrical energy, and generally includes at least a positive electrode, a negative electrode, and an electrolyte. During the charging and discharging process of the battery, active ions repeatedly insert and extract between the positive and negative electrode plates. The electrolyte acts as a conductor for the active ions between the positive and negative electrode plates.

[0051] like Figure 3 As shown, the shape of battery cell 1 can be square. However, it is understood that the shape of battery cell 1 is not limited to square; in other examples, the shape of battery cell 1 can also be cylindrical or other arbitrary shapes.

[0052] In some embodiments, the battery cell 1 may include an outer packaging. This outer packaging may be used to encapsulate the electrode assembly and the electrolyte.

[0053] In some embodiments, the outer packaging of the battery cell 1 can be a rigid shell, such as a hard plastic shell, an aluminum shell, a steel shell, etc. The outer packaging of the battery cell 1 can also be a soft pack, such as a pouch-type soft pack. The material of the soft pack can be plastic; further, non-limiting examples of plastic may include one or more of polypropylene, polybutylene terephthalate, and polybutylene succinate.

[0054] like Figure 4 As shown, the outer packaging of the battery cell 1 may include a housing 11 and a cover plate 13. The housing 11 may include a bottom plate and side plates connected to the bottom plate, the bottom plate and side plates forming a receiving cavity. The housing 11 has an opening communicating with the receiving cavity, and the cover plate 13 can be placed over the opening to close the receiving cavity. The positive electrode sheet, negative electrode sheet, and separator can be formed into an electrode assembly 12 by a winding process or a stacking process. The electrode assembly 12 is encapsulated within the receiving cavity. Electrolyte is immersed in the electrode assembly 12. The number of electrode assemblies 12 contained in the battery cell 1 can be one or more, which can be selected by those skilled in the art according to actual needs.

[0055] Unless otherwise specified in this application, battery 3 may be a battery module or a battery pack.

[0056] The battery module includes multiple battery cells 1. The number of battery cells 1 in the battery module can be two or more, and those skilled in the art can select an appropriate number according to the application and capacity of the battery module.

[0057] In the battery module, multiple battery cells 1 can be arranged sequentially along the length of the battery module. Of course, they can also be arranged in any other manner. Furthermore, these multiple battery cells 1 can be secured with fasteners.

[0058] Optionally, the battery module can further include a housing having an accommodation space in which the plurality of battery cells 1 are accommodated.

[0059] In some embodiments, the battery module described above can be assembled into a battery pack, and the number of battery modules contained in the battery pack can be one or more, and a person skilled in the art can select a suitable number according to the application and capacity of the battery pack.

[0060] In the battery pack, a battery box and a plurality of battery modules disposed in the battery box can be included. The battery box includes an upper box body and a lower box body, and the upper box body can be arranged on the lower box body to form a closed space for accommodating the battery modules. The plurality of battery modules can be arranged in the battery box in any manner.

[0061] At present, an adhesive is usually filled in the accommodation space formed by the housing of the battery module to fix the battery cells 1. However, when the battery cells 1 are loaded into the accommodation space, the adhesive at the bottom is extruded and overflowed between the adjacent two battery cells 1, and stress concentration is caused after the adhesive is solidified. The battery cells 1 shrink and expand in the charge and discharge cycle, and the expansion space of the battery cells 1 is reduced due to the influence of the stress after the adhesive is solidified, so that part of the electrolyte is retained at the bottom of the battery cells 1, the electrolyte cannot well wet the pole piece, and the battery cells 1 are affected to cause lithium precipitation, thereby affecting the capacity development.

[0062] In addition, in the conventional technology, a heat insulation layer is usually arranged between the adjacent two battery cells 1 to reduce the probability of thermal runaway. Most of these heat insulation layers use aerogel heat insulation materials, which cannot well block the overflow of the adhesive at the bottom, and are easy to adsorb the adhesive to reduce the heat insulation effect. At the same time, most of the conventional heat insulation layers are designed in an integrated manner, and the hardness and thermal conductivity thereof cannot be adaptively adjusted according to different models of the battery cells 1, which limits the shrinkage and expansion of the battery cells 1, not only affects the development of the battery capacity, but also causes the loss of the heat insulation layer, so that the heat insulation performance is further deteriorated.

[0063] Based on this, in the battery 3 provided in the present application, as shown in Figure 2 At least two battery cells 1 are provided with an isolation structure 2 therebetween. As shown in Figure 5 The isolation structure 2 includes a heat insulation layer 21 and a protective layer 22 arranged at the outer peripheral side of the heat insulation layer 21, and the protective layer includes a thermoplastic elastomer.

[0064] In the present application, the thermoplastic elastomer (TPE) is a kind of high molecular material which has the elasticity of rubber at room temperature and can be molded at high temperature, and has the physical and mechanical properties of vulcanized rubber and the process processing properties of thermoplastic plastic.

[0065] The battery 3 provided in the present application has at least two battery monomers 1 between which an isolation structure 2 is arranged. In the isolation structure 2, the heat insulation layer 21 bears the heat insulation function, which can reduce the probability of the whole battery 3 being in thermal runaway caused by the thermal runaway of the battery monomer 1. The protective layer 22 is made of thermoplastic elastomer and is used to bond the battery monomers 1 on both sides. It has good cushioning performance, can deform under pressure and rebound after pressure relief, can absorb the thickness tolerance of the battery monomer 1, and can adapt to the compression deformation and expansion rebounding demand of the battery monomer 1 in the charging and discharging process. In the assembly process of the battery 3, the protective layer 22 can block the adhesive at the bottom from overflowing between the opposite two sides of the battery monomer 1, which can not only reduce the stress concentration problem of the battery monomer 1, promote the evaporation of the battery capacity, but also reduce the influence of the adhesive on the heat insulation layer, thereby improving the safety performance of the battery. In addition, the heat insulation layer 21 and the protective layer 22 can be designed separately to adapt to the different needs of different models of battery monomers 1 for heat insulation performance and cushioning performance, and the thickness, size, coverage area and other structural characteristics of the heat insulation layer 21 and the protective layer 22 can be flexibly adjusted during the assembly process of the battery 3, thereby effectively improving the safety performance of the battery 3.

[0066] In the battery 3, the number of isolation structures 2 contained in the battery 3 can be one or more, and those skilled in the art can select an appropriate number of isolation structures 2 according to the application of the battery 3 and the number of battery monomers 1.

[0067] In Figure 1 and Figure 2 In the specific examples shown in the specific examples, isolation structures 2 are arranged between each of the adjacent two battery monomers 1. Thus, good heat insulation and cushioning protection effects can be provided for each battery monomer 1.

[0068] It can be understood that in other specific examples, isolation structures 2 are arranged only between some adjacent battery monomers 1 in the battery 3, and isolation structures 2 can not be arranged between some other adjacent battery monomers 1, and those skilled in the art can flexibly adjust according to the needs of different models of battery monomers 1.

[0069] In some embodiments, the battery 3 further comprises a shell, and the plurality of battery monomers 1 are arranged in the shell, and at least one battery monomer 1 and the shell are provided with the isolation structure 2.

[0070] In the present application, unless otherwise specified, the shell of the battery 3 has a containing space, and the plurality of battery monomers 1 are contained in the containing space. The shell of the battery 3 can include an insulating cover, an end plate, and an upper cover plate and a lower cover plate connected with the end plate, and the end plate, the upper cover plate and the lower cover plate form a containing space, and the insulating cover can be arranged on the outer circumferential side of the battery monomer 1. The isolation structure 2 can be arranged between the battery monomer 1 and the insulating cover, or between the battery monomer 1 and the end plate, so as to improve the heat insulation performance and the cushioning performance of the whole battery 3.

[0071] In Figure 5 In the specific example shown, the thickness D of the protective layer 22 is greater than the thickness d of the thermal insulation layer 21, i.e. D>d. In this way, a certain space is reserved between the battery monomer 1 and the thermal insulation layer 21, which can reduce the influence of the volume shrinkage and expansion of the battery monomer 1 on the thermal insulation layer 21 during the charging and discharging cycle, and effectively reduce the heat transfer between adjacent battery monomers 1, further improve the buffering performance and thermal insulation performance, thereby further improving the safety performance of the battery 3.

[0072] It can be understood that in other specific examples, the thickness D of the protective layer 22 can also be equal to the thickness d of the thermal insulation layer 21. In this way, the protective layer 22 can also provide good buffering and protection effect while bonding the battery monomers 1 on both sides.

[0073] In some embodiments, the thickness D of the protective layer 22 is 0.1mm-10mm, for example, it can be 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, or it can be a range composed of any of the above values. In this way, the protective layer 22 has excellent buffering and protection performance, while also saving the internal space of the battery 3, thereby improving the energy density of the battery 3.

[0074] In some embodiments, the minimum width of the protective layer 22 is the same as the width D of the protective layer 22, i.e. the minimum width of the protective layer 22 is 0.1mm-10mm. It can be understood that the maximum width of the protective layer 22 is less than 1 / 2 of the width of the battery monomer 1, and those skilled in the art can flexibly adjust the width of the protective layer 22 according to the size and performance requirements of the battery monomer 1. The width of the protective layer 22 in different areas can be the same or different. In this way, the buffering and protection effect of the protective layer 22 is particularly prominent.

[0075] In some embodiments, the thickness d of the thermal insulation layer 21 is 0.1mm-5mm, for example, it can be 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 2mm, 3mm, 4mm or 5mm, or it can be a range composed of any of the above values. In this way, good thermal insulation performance can be provided, and the internal space of the battery 3 can also be saved, thereby improving the energy density of the battery 3.

[0076] As Figure 6As shown, at least one surface of the heat insulation layer 21 is further provided with an adhesive layer 23, through which the heat insulation layer 21 is bonded to the battery cell 1. As a non-limiting example, the adhesive layer 23 may include at least one of double-sided adhesive and hot melt adhesive. This improves the adhesion between the insulating structure 2 and the battery cell 1, while the adhesive layer 23 also provides a certain buffering and heat insulation effect, further enhancing the safety performance of the battery 3.

[0077] like Figure 1-2 As shown, the opposing surfaces of adjacent battery cells 1 are large surfaces, and the isolation structure 2 is located between the opposing large surfaces of two adjacent battery cells 1. In this application, the large surface of a battery cell 1 refers to the surface of the battery cell 1 with a relatively large area, for example, it can be... Figure 4 The two relatively large surfaces in the side panel of the casing 11 shown. In this way, the isolation structure 2 is placed between the large surfaces of the battery cell 1, which can achieve better adhesion, cushioning and heat insulation effects.

[0078] like Figure 3-4 As shown, the main surface of the battery cell 1 has two opposing sides, a bottom edge, and a top edge. The bottom edge is close to the bottom plate of the casing, and the top edge is close to the cover plate 13 of the casing 11. Figure 7 As shown, the protective layer 22a is wrapped around a portion of the bottom edge and at least two side edges, forming a U-shaped structure. Understandably, the protective layer 22a wrapped around the side edges is interconnected with the protective layer 22a wrapped around the bottom edge, and the protective layer 22a wrapped around the side edges extends from the bottom edge to the top edge. The length of the extension is not specifically limited and can be flexibly adjusted by those skilled in the art according to the amount of adhesive filling during the specific construction process. Furthermore, the protective layer 22a is wrapped around all areas of the bottom edge and two side edges. Thus, the protective layer 22a can provide excellent buffering protection, effectively preventing the adhesive inside the battery casing 3 from penetrating between the battery cells 1.

[0079] like Figure 8 As shown, the protective layer 22b is wrapped around the two sides, bottom edge, and top edge to form a closed structure with a hollow area in the middle, and the heat insulation layer 21 is located in this hollow area. Therefore, the closed structure formed by the protective layer 22b has a larger coverage area, providing better buffering and protection, preventing adhesives or other debris from intruding between adjacent battery cells 1, reducing the restriction on the expansion space of the battery cells 1, and thus promoting the full utilization of the battery cell 1's capacity.

[0080] Understandably, the shape of the protective layer 22b corresponds one-to-one with the shape of the heat insulation layer 21. Figure 8In the specific example shown, the heat insulation layer 21 is rectangular in shape, and the corresponding protective layer 22b is rectangular in shape and forms a closed structure. It can be understood that in other specific examples, the heat insulation layer 21 can also be at least one of a common shape such as a circle, a triangle, and a trapezoid, and the closed structure formed by the protective layer 22b can be at least one of a circular closed structure, a triangular closed structure, and a trapezoidal closed structure. In this way, the shape of the isolation structure 2 can be flexibly adjusted according to the requirements of different models of battery monomers 1.

[0081] In Figure 8 In the specific example shown, the central region of the battery monomer 1 is located within the hollow region. In this way, the isolation structure 2 provides better heat insulation and buffering protection effects on the central region of the battery monomer 1.

[0082] In some embodiments, the area ratio of the isolation structure 2 on the large face is 50% to 110%, for example, it can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, 105%, or 110%, or it can be a range composed of any of the above values. In this way, the coverage area of the isolation structure 2 on the large face can be flexibly adjusted according to the performance requirements of the battery 3 and the amount of adhesive used in the actual construction process.

[0083] In some embodiments, the area ratio of the isolation structure 2 on the large face is less than 100%, that is, the isolation structure 2 only covers part of the area of the large face. At this time, the distance between the outer edge of the hollow region enclosed by the protective layer 22 and the outer edge of the battery monomer 1 is ≤20mm, for example, it can be 0.01mm, 0.05mm, 0.1mm, 0.5mm, 1mm, 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, or 20mm, or it can be a range composed of any of the above values. Further, the distance between the outer edge of the hollow region and the outer edge of the battery monomer 1 is 0.1mm to 20mm. Further, the distance between the outer edge of the hollow region and the outer edge of the battery monomer 1 is 3mm to 10mm. In this way, the raw materials can be saved while providing good buffering protection effect, and the preparation cost of the battery 3 is reduced.

[0084] The area ratio of the isolation structure 2 on the large face is 100%, that is, the isolation structure 2 covers the entire large face. At this time, the distance between the outer edge of the hollow region and the outer edge of the battery monomer 1 is 0. In this way, the buffering protection effect on the battery monomer 1 is particularly prominent.

[0085] The area ratio of the isolation structure 2 on the large face is higher than 100%, that is, the protective layer 22 of the isolation structure 2 can protrude from the outer edge of the battery monomer 1. At this time, the distance between the outer edge of the hollow area and the outer edge of the battery monomer 1 is negative. Thus, the isolation structure 2 can not only buffer the force from the horizontal direction, but also buffer the force from the vertical direction, and the buffering and protection effect of the battery monomer 1 is more comprehensive.

[0086] In some embodiments, the area ratio of the heat insulation layer 21 on the large face is 50% to 100%, for example, can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100%, or can be a range composed of any of the above values. It can be understood that the outer edge of the heat insulation layer 21 can be connected with the inner edge of the protective layer 22, and the outer edge of the heat insulation layer 21 can also be embedded in the inside of the protective layer 22, thereby forming a mortise and tenon joint structure. For example, when the area ratio of the heat insulation layer 21 on the large face is 100%, the outer edge of the heat insulation layer 21 is embedded in the inside of the protective layer 22, and at least a part of the protective layer 22 covers the large face to bond two adjacent battery monomers 1. In this way, the ratio of the coverage area of the heat insulation layer 21 and the protective layer 22 can be adjusted, so as to balance the good heat insulation performance and buffering performance.

[0087] The following refers to Figure 5 The other performance requirements of the heat insulation layer 21 and the protective layer 22 are described in detail.

[0088] In some embodiments, the protective layer 22 comprises a thermoplastic elastomer, and the melting temperature thereof can be 100℃ to 250℃, for example, can be 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃ or 250℃, or can be a range composed of any of the above values. In this way, the protective layer 22 changes only the physical state without changing the chemical state at room temperature and in the molten state, has a certain flowability at the melting temperature, is convenient for coating construction, and the thickness, shape and distribution position of the protective layer 22 can be adjusted adaptively according to the needs of different models of battery monomers 1 during the coating construction process.

[0089] In some embodiments, the protective layer 22 has a melt viscosity of 1000 cP to 400000 cP. In the present application, the melt viscosity has the meaning known in the art and can be tested by using the instruments and methods known in the art, for example, refer to ASTM D3236. For example, the melt viscosity of the protective layer 22 can be 1000 cP, 2000 cP, 5000 cP, 8000 cP, 10000 cP, 20000 cP, 50000 cP, 100000 cP, 150000 cP, 200000 cP, 250000 cP, 300000 cP, 350000 cP or 400000 cP, or can be a range consisting of any of the above values. In this way, the adhesion strength of the protective layer 22 can be improved, and the construction performance and film quality of the protective layer 22 can be improved.

[0090] In some embodiments, the protective layer 22 has an adhesion strength of ≥0.65 MPa. In the present application, the adhesion strength has the meaning known in the art and can be tested by using the instruments and methods known in the art, for example, refer to GB / T 7124-2008. For example, the adhesion strength of the protective layer 22 can be 0.65 MPa, 0.7 MPa, 0.75 MPa, 0.8 MPa, 0.85 MPa, 0.9 MPa, 0.95 MPa, 1 MPa or 1.1 MPa. Further, the adhesion strength of the protective layer 22 can be 0.65 MPa to 0.95 MPa. In this way, the adhesion strength of the protective layer 22 is high, and the battery monomer 1 can be effectively fixed, and the displacement and falling of the battery monomer 1 can be reduced.

[0091] In some embodiments, the protective layer 22 has a Shore hardness of 10HA to 50HA. In the present application, the Shore hardness has the meaning known in the art, and the unit HA represents that it is the Shore A hardness, which is suitable for softer materials, and the Shore hardness can be tested by using the instruments and methods known in the art, for example, refer to GB / T 2411-2008. For example, the Shore hardness of the protective layer 22 can be 10HA, 15HA, 20HA, 25HA, 30HA, 35HA, 40HA, 45HA or 50HA, or can be a range consisting of any of the above values. In this way, the protective layer 22 is relatively soft and easy to compress and deform, and can absorb the expansion force generated from the battery monomer 1, thereby providing good buffering and protection effect.

[0092] In some embodiments, the compression resilience of the protective layer 22 is 10% to 100%. In the present application, the compression resilience has the meaning known in the art and can be tested using instruments and methods known in the art, for example, it can be determined according to the following method: the cushioning adhesive layer is made into a sample with a size of φ10 mm x 2 mm (10 mm in diameter and 2 mm in length), the compression tester is used to completely cover the surface of the sample, the sample is compressed at a compression amount of 50%, and after the pressure is released, the rebound thickness is recorded, and the compression resilience is calculated according to the formula: compression resilience = (rebound thickness - initial thickness x 50%) / (initial thickness x 50%). For example, the compression resilience of the protective layer 22 can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%, or a range consisting of any of the above values. Thus, the compression resilience of the protective layer 22 is high, and it is easy to rebound after the swelling force generated by the battery cell 1 disappears, thereby providing good cushioning protection effect.

[0093] In some embodiments, the compression modulus of the protective layer 22 is ≤0.7 MPa. In the present application, the compression modulus has the meaning known in the art and can be tested using instruments and methods known in the art, and can be tested according to GB / T 7757-2009, the compression tester is used to completely cover the surface of the sample, the compression rate is 2 mm / min, the sample is compressed to 90% strain, and the slope of the linear part of the compression stress-strain curve is extracted as the compression modulus. The compression modulus of the protective layer 22 can be 0.4 MPa, 0.45 MPa, 0.5 MPa, 0.55 MPa, 0.6 MPa, 0.65 MPa or 0.7 MPa, or a range consisting of any of the above values. Further, the compression modulus of the protective layer 22 can be 0.55 MPa to 0.65 MPa. Thus, the compression modulus of the protective layer 22 is low, and it can provide good cushioning protection effect for the battery cell while maintaining certain supporting ability and dimensional stability.

[0094] In some embodiments, the thermoplastic elastomer in the protective layer 22 includes at least one of a styrenic thermoplastic elastomer, an olefinic thermoplastic elastomer, a thermoplastic polyurethane elastomer (TPU), a polyester thermoplastic elastomer, and a polyamide thermoplastic elastomer. The styrenic thermoplastic elastomer includes at least one of a styrene-butadiene-styrene triblock copolymer (SBS), a hydrogenated styrene-butadiene-styrene triblock copolymer (SEBS), a styrene-isoprene-styrene triblock copolymer (SIS), and a hydrogenated styrene-isoprene-styrene triblock copolymer (SEPS). The olefinic thermoplastic elastomer includes at least one of an ethylene-vinyl acetate copolymer (EVA) and an ethylene-ethyl acrylate copolymer (EEA). In this application, a block copolymer refers to a special copolymer in which two or more polymer segments with different chemical structures are alternately polymerized. According to the number of segments that make up the block copolymer, the block copolymer can be divided into diblock copolymer, triblock copolymer, and multiblock copolymer. Thus, the protective layer 22 is made of the above thermoplastic elastomer, has high bonding strength, excellent cushioning performance, can be compressed and deformed when the battery monomer 1 expands, and can expand and rebound when the battery monomer 1 shrinks, thereby effectively improving the safety performance of the battery 3.

[0095] Further, the protective layer 22 can further include tackifiers, viscosity modifiers, plasticizers, antioxidants, and other additives to improve the bonding performance, flowability, and other properties of the protective layer 22.

[0096] In some embodiments, the thermal insulation layer 21 satisfies the following performance: the thermal insulation layer 21 includes a first surface and a second surface arranged opposite to each other, the temperature of the first surface is heated to 200±3°C, and the temperature of the second surface is lower than 140°C. For example, the temperature of the second surface can be 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, or 140°C, or can be a range consisting of any of the above values. Further, the temperature of the second surface is lower than 100°C. Thus, the thermal insulation layer 21 has excellent thermal insulation effect, can provide good thermal insulation protection effect for the battery monomer 1, and improve the safety performance and service life of the battery 3.

[0097] In some embodiments, the thermal insulation layer 21 includes a thermal insulation core layer 211 and a protective layer 212 disposed on at least one surface of the thermal insulation core layer 211. As a non-limiting example, the protective layer 212 can be disposed on one surface of the thermal insulation core layer 211, or on both opposite surfaces of the thermal insulation core layer 211. In this way, the thermal insulation core layer 211 can provide excellent thermal insulation performance, and the protective layer 212 can provide physical protection to the thermal insulation core layer 211, reduce damage to the thermal insulation core layer 211 when the battery cell 1 expands in volume, and improve the stability of the thermal insulation performance.

[0098] In some embodiments, the thermal insulation core layer 211 includes at least one of an aerogel thermal insulation layer and a mica thermal insulation layer. In this way, the thermal insulation core layer 211 has excellent thermal insulation performance.

[0099] In some embodiments, the aerogel thermal insulation layer includes a fiber base material and aerogel loaded on the fiber base material, the fiber base material including at least one of a pre-oxidized fiber felt, a glass fiber paper, a ceramic fiber paper, and an organic foam, and the aerogel including at least one of a silica aerogel, an alumina aerogel, a titanium dioxide aerogel, and a zirconium dioxide aerogel; and the mica thermal insulation layer includes at least one of a mica plate and a mica paper. In this way, the thermal insulation core layer 211 has excellent thermal insulation performance and good mechanical strength.

[0100] In some embodiments, the protective layer 212 includes at least one of a polymer film and a surface coating layer, the polymer film including at least one of a polyethylene (PE) film, a polypropylene (PP) film, a polyester film, a polyurethane (PU) film, a polyamide (PA) film, a polyimide (PI) film, and a polyethylene terephthalate (PET) film, and the surface coating layer including at least one of an epoxy resin coating layer, an acrylic resin coating layer, and a polyimide coating layer. In this way, the thermal insulation core layer 211 can be provided with good physical protection.

[0101] In some embodiments, the isolation structure 2 can be prepared by disposing the thermal insulation layer 21 on at least one surface of one battery cell 1, applying hot melt adhesive in a molten state to the outer circumferential side of the thermal insulation layer 21, covering another battery cell 1 on the surface of the thermal insulation layer 21 and the hot melt adhesive, and allowing the hot melt adhesive in the molten state to cool and set to form a protective layer 22, thereby forming the isolation structure 2 between the two adjacent battery cells 1.

[0102] In some embodiments, the isolation structure 2 can also be prepared by the following method: applying hot melt adhesive in a molten state on the surface of the battery cell 1, disposing the thermal insulation layer 21 on the inner circumferential side of the hot melt adhesive, covering another battery cell 1 on the surface of the thermal insulation layer 21 and the hot melt adhesive, and allowing the hot melt adhesive in a molten state to cool and set to form the protective layer 22, thereby forming the isolation structure 2 between the two adjacent battery cells 1.

[0103] The application also provides a power utilization device. The power utilization device comprises the above-mentioned battery device. Thus, the electrical performance and safety performance of the power utilization device are improved.

[0104] In some embodiments, the battery device can be used as a power source of a power utilization device, or as an energy storage unit of a power utilization device. The power utilization device can include a mobile device, an electric vehicle, an electric train, a ship and a satellite, an energy storage system, etc., but is not limited thereto. The mobile device can be a mobile phone, a notebook computer, etc., for example; the electric vehicle can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc., but is not limited thereto.

[0105] As a power utilization device, the battery device can be selected according to the use requirements thereof.

[0106] Figure 9 The power utilization device 4 is an example. The power utilization device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc. In order to meet the requirements of the power utilization device for high power and high energy density of the secondary battery, a battery pack or a battery device can be used.

[0107] The device as another example can be a mobile phone, a tablet computer, a notebook computer, etc. The device usually requires thinning, and a battery cell can be used as a power source, but the application is not limited thereto, and a battery pack or a battery device can also be used as a power source.

[0108] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the application.

[0109] The above-mentioned embodiments only express several embodiments of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are within the scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A battery, characterized by, The battery comprises: a plurality of battery cells, at least two adjacent battery cells being provided with an isolation structure; the isolation structure comprises a heat insulation layer and a protective layer provided on the outer circumferential side of the heat insulation layer, and the protective layer comprises a thermoplastic elastomer.

2. The battery of claim 1, wherein, The thickness of the protective layer is not less than the thickness of the heat insulation layer.

3. The battery of claim 2, wherein, The thickness of the protective layer is greater than the thickness of the heat insulation layer.

4. The battery of claim 3, wherein, At least one surface of the heat insulation layer is provided with an adhesive layer, and the heat insulation layer is bonded to the battery cell through the adhesive layer.

5. The battery according to any one of claims 1 to 4, characterized in that, The opposite surfaces of the adjacent battery cells are large surfaces, and the isolation structure is located between the opposite large surfaces of the two adjacent battery cells.

6. The battery of claim 5, wherein, The large surface has two opposite side edges, a bottom edge and a top edge, and the protective layer is arranged around part of the bottom edge and at least two side edges.

7. The battery of claim 6, wherein, The protective layer is arranged around the two side edges, the bottom edge and the top edge of the large surface to form a closed structure with a hollow region in the middle, and the heat insulation layer is located in the hollow region.

8. The battery of claim 7, wherein, The central region of the battery cell is located within the hollow region.

9. The battery of any one of claims 7-8, wherein, The area ratio of the isolation structure to the large surface is 50% to 110%.

10. The battery of claim 9, wherein, The isolation structure covers the entire large surface.

11. The battery of any one of claims 7-8 and 10, wherein, The isolation structure satisfies at least one of the following conditions: (1) the thickness of the protective layer is 0.1 mm to 10 mm; (2) the minimum width of the protective layer is 0.1 mm to 10 mm; (3) the thickness of the heat insulation layer is 0.1 mm to 5 mm; (4) the area ratio of the heat insulation layer to the large surface is 50% to 100%; (5) the distance between the outer edge of the hollow region and the outer edge of the battery cell is ≤20 mm.

12. The battery of any one of claims 1-4, 6-8, and 10, wherein, The thermoplastic elastomer comprises at least one of a styrene-based thermoplastic elastomer, an olefin-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, a polyester-based thermoplastic elastomer and a polyamide-based thermoplastic elastomer; The styrene-based thermoplastic elastomer comprises at least one of a styrene-butadiene-styrene triblock copolymer, a hydrogenated styrene-butadiene-styrene triblock copolymer, a styrene-isoprene-styrene triblock copolymer and a hydrogenated styrene-isoprene-styrene triblock copolymer; The olefin-based thermoplastic elastomer comprises at least one of an ethylene-vinyl acetate copolymer and an ethylene-ethyl acrylate copolymer.

13. The battery of any one of claims 1-4, 6-8, and 10, wherein, The heat insulation layer comprises a heat insulation core layer and a protective layer provided on at least one surface of the heat insulation core layer, and the heat insulation core layer comprises at least one of an aerogel heat insulation layer and a mica heat insulation layer.

14. The battery of any one of claims 1-4, 6-8, and 10, wherein, The battery further comprises a shell, and a plurality of battery cells are arranged in the shell, and at least one battery cell and the shell are provided with the isolation structure according to any one of claims 1 to 13.

15. An electrical device, comprising: The battery comprises any one of claims 1 to 14.

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