Battery and electric device

Abstract

The application provides a battery and a power utilization device, and relates to the field of batteries. The battery comprises a plurality of battery monomers and a heat insulation piece, and the heat insulation piece is arranged between two adjacent battery monomers. The heat insulation piece is a glue layer connecting the two adjacent battery monomers. The battery is provided with the heat insulation piece between the two adjacent battery monomers, the heat insulation piece can play a heat insulation effect, and when thermal runaway occurs in a certain battery monomer, the heat is not easy to be conducted to another battery monomer, and the thermal runaway of the another battery monomer is not easy to be caused. The heat insulation piece is the glue layer connecting the two adjacent battery monomers, so that when the battery is manufactured, only the glue material needs to be coated on the battery monomer, and the two battery monomers are pressed together to form the above-mentioned glue layer, the process is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery and an electrical device. Background Technology

[0002] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as energy density, discharge capacity, and charge / discharge rate. Additionally, battery manufacturing costs must be considered. However, currently, ensuring adequate battery manufacturing costs remains a challenge. Summary of the Invention

[0003] The purpose of this application is to provide a battery and an electrical device that aims to improve the problem of high manufacturing costs of batteries in the related art.

[0004] In a first aspect, embodiments of this application provide a battery, the battery including a plurality of battery cells and a heat insulation component, the heat insulation component being disposed between two adjacent battery cells, wherein the heat insulation component is an adhesive layer connecting two adjacent battery cells.

[0005] In the above technical solution, a heat insulation component is provided between two adjacent battery cells. This component provides thermal insulation, preventing heat transfer to the other battery cell in the event of thermal runaway in one cell, thus reducing the likelihood of thermal runaway in the other cell. The heat insulation component is an adhesive layer connecting the two adjacent battery cells. Therefore, during battery manufacturing, it is only necessary to apply adhesive to the battery cells and press the two cells together to form the adhesive layer, resulting in a simple process and low manufacturing cost.

[0006] As an optional technical solution in this application embodiment, the adhesive layer is configured to buffer the expansion of the battery cell.

[0007] In the aforementioned technical solutions, because battery cells expand during use, if a battery cell is in rigid contact with other structures, it cannot expand outward and is subjected to significant compressive force, thus affecting its performance. In this embodiment, the adhesive layer provides a buffering effect, cushioning the expansion of the battery cell to reduce the risk of damage and ensure battery performance. Furthermore, since the adhesive layer provides both heat insulation and buffering, a single component can perform multiple functions, simplifying the battery structure and reducing manufacturing costs.

[0008] As an optional technical solution in this application embodiment, the adhesive layer can deform under pressure. The volume of the adhesive layer after deformation under pressure less than or equal to 10 MPa is V1, and the volume of the adhesive layer before deformation under pressure is V2, satisfying: 50% ≤ V1 / V2 < 100%.

[0009] In the above technical solution, pressure is applied to the adhesive layer when the battery cell expands, causing the adhesive layer to deform and buffer the expansion of the battery cell. The greater the pressure on the adhesive layer, the greater the deformation it can undergo. When the pressure on the adhesive layer is equal to 10 MPa, the minimum volume of the deformed adhesive layer can be half of its original volume, thus providing a good buffering effect.

[0010] As an optional technical solution in this application embodiment, the flame retardant rating of the adhesive layer is higher than V-2.

[0011] In the above technical solution, the adhesive layer has a flame-retardant effect, and its flame-retardant rating is higher than V-2. This means that when one battery cell catches fire, the adjacent battery cell is less likely to be ignited, giving the operator more time to react. Furthermore, the adhesive layer provides both heat insulation and flame retardancy, allowing a single component to perform multiple functions. This simplifies the battery structure and reduces manufacturing costs.

[0012] As an optional technical solution in this application embodiment, the flame retardant rating of the adhesive layer is V-0.

[0013] In the above technical solution, the flame retardant effect is better when the flame retardant rating of the adhesive layer is V-0.

[0014] As an optional technical solution in this application embodiment, the shear strength of the adhesive layer is B, which satisfies: B≥1MPa.

[0015] In the above technical solution, by making the shear strength of the adhesive layer greater than 1 MPa, the adhesive layer is not easily damaged by shear force, which helps to ensure the heat insulation effect of the adhesive layer.

[0016] As an optional technical solution in this application embodiment, the thickness of the adhesive layer is C, which satisfies: 1mm≤C≤3mm.

[0017] In the above technical solution, limiting the thickness of the adhesive layer to 1-3 mm ensures good flame retardancy without excessively occupying the battery's internal space, thus maintaining the battery's energy density. When C ≤ 1 mm, the flame retardancy is poor. When C ≥ 3 mm, the adhesive layer is too thick, occupying too much internal space and reducing the battery's energy density.

[0018] As an optional technical solution in this application embodiment, C≤2mm.

[0019] In the above technical solution, the thickness of the adhesive layer is between 1 and 2 mm, which not only has a good flame retardant effect, but also enables the battery to have a high energy density.

[0020] As an optional technical solution in this application embodiment, the battery cell has a connecting surface, which is the surface with the largest area on the outer surface of the battery cell, and the adhesive layer is connected to the connecting surface.

[0021] In the above technical solution, since the connecting surface is the largest surface area of ​​the battery cell, it radiates a significant amount of heat when the battery cell experiences thermal runaway. Applying an adhesive layer to the connecting surface provides good thermal insulation.

[0022] As an optional technical solution in this application embodiment, the battery cell has a connecting surface, the adhesive layer is connected to the connecting surface, the contact area between the adhesive layer and the connecting surface is S1, and the area of ​​the connecting surface is S2, satisfying: 20% ≤ S1 / S2 ≤ 100%.

[0023] In the above technical solution, the ratio of the contact area between the adhesive layer and the connecting surface to the area of ​​the connecting surface is between 20% and 100%, so that the adhesive layer has a good heat insulation effect while keeping costs low. Furthermore, the larger the value of S1 / S2, the better the heat insulation effect, but the cost increases accordingly. When S1 / S2 ≤ 20%, the contact area between the adhesive layer and the connecting surface is too small, resulting in poor heat insulation. When S1 / S2 > 100%, the adhesive layer is too large, causing waste and hindering cost reduction.

[0024] As an optional technical solution in this application embodiment, the battery cell has a connecting surface, the adhesive layer is connected to the connecting surface, and there is a distance between the adhesive layer and the edge of the connecting surface.

[0025] In the above technical solution, there is a distance between the adhesive layer and the edge of the connecting surface, and the adhesive layer is set close to the middle of the connecting surface to achieve a better heat insulation effect.

[0026] As an optional technical solution in this application embodiment, the adhesive layer is ring-shaped.

[0027] In the above technical solution, when a battery cell expands, the center of the cell's surface typically bulges outwards first. Because the adhesive layer is annular, the protruding portion can extend into the inner ring of the adhesive layer when the battery cell expands, thus buffering the amount of expansion.

[0028] As an optional technical solution in this application embodiment, the adhesive layer includes a first part and a second part that do not contact each other, and the first part and the second part are both connected to two adjacent battery cells.

[0029] In the above technical solution, when the battery cell expands, the protruding part can extend between the first part and the second part, thereby buffering the expansion of the battery cell.

[0030] As an optional technical solution in this application embodiment, the adhesive layer includes at least one of aerogel and epoxy acrylic system materials.

[0031] In the above technical solutions, both aerogel and epoxy acrylic system materials have good thermal insulation properties. At the same time, aerogel also has good buffering and flame retardant capabilities, and its shear strength is also high.

[0032] Secondly, embodiments of this application also provide an electrical device, the electrical device including the aforementioned battery, the battery being used to provide electrical energy to the electrical device. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0035] Figure 2 Exploded views of batteries (adhesive layer not shown) provided in some embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the battery structure when the battery cell is in normal operation, provided in some embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the battery structure when a single battery cell expands, provided in some embodiments of this application;

[0038] Figure 5 This is a schematic diagram of the structure of the adhesive layer connected to the joint surface provided in some embodiments of this application;

[0039] Figure 6 This is a schematic diagram of the adhesive layer being bonded to the bonding surface, provided in some other embodiments of this application;

[0040] Figure 7 This is a schematic diagram of the structure of the adhesive layer connected to the joint surface provided in some embodiments of this application;

[0041] Figure 8This is a schematic diagram of the adhesive layer being bonded to the bonding surface in some embodiments of this application;

[0042] Figure 9 This is a schematic diagram of the adhesive layer being connected to the joint surface, as provided in some other embodiments of this application.

[0043] Icons: 10-Box; 11-Upper Box; 12-Lower Box; 20-Battery Cell; 21-Connecting Surface; 22-Electrode Terminal; 30-Adhesive Layer; 31-First Part; 32-Second Part; 100-Battery; 200-Controller; 300-Motor; 1000-Vehicle. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0046] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0049] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0050] In this application, "multiple" means two or more (including two).

[0051] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited thereto.

[0052] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0053] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0054] The development of battery technology must consider multiple design factors simultaneously, such as battery life, energy density, discharge capacity, and charge / discharge rate. Additionally, battery safety must also be considered.

[0055] To improve battery safety, thermal insulation pads are usually placed between two adjacent battery cells. This prevents the heat from being transferred to the other battery cell in the event of thermal runaway in one cell, thus reducing the risk of thermal runaway in the other cell.

[0056] The inventors discovered through research that, in the manufacturing process of existing batteries, double-sided adhesive is applied to the heat insulation pad using an adhesive applicator, and the film is then peeled off using a robotic arm before being attached to the battery cell. This complex manufacturing process and the high cost of the equipment result in the high manufacturing cost of batteries in the existing technology.

[0057] Therefore, this application provides a battery comprising multiple battery cells and a heat insulation component, wherein the heat insulation component is disposed between two adjacent battery cells. The heat insulation component is an adhesive layer connecting two adjacent battery cells.

[0058] This battery features a heat insulation component between adjacent battery cells. This component effectively prevents heat transfer to the other battery cell in the event of thermal runaway in one cell, thus reducing the risk of thermal runaway in the other cell. The heat insulation component is a layer of adhesive connecting the two adjacent battery cells. Therefore, during battery manufacturing, the adhesive layer is simply formed by applying adhesive to the battery cells and pressing the two cells together, resulting in a simple process and low manufacturing cost.

[0059] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0060] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power 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, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0061] For ease of explanation, the following embodiments will use a vehicle 1000 as an example of electrical equipment.

[0062] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0063] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0064] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include an upper housing 11 and a lower housing 12, which overlap each other, collectively defining a space for accommodating the battery cell 20. The lower housing 12 may be a hollow structure with one open end, and the upper housing 11 may be a plate-like structure, covering the open side of the lower housing 12 so that the upper housing 11 and lower housing 12 collectively define the space; alternatively, both the upper housing 11 and lower housing 12 may be hollow structures with one open side, with the open side of the upper housing 11 covering the open side of the lower housing 12. Of course, the box 10 formed by the upper box 11 and the lower box 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0065] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0066] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0067] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of the battery 100 under normal conditions provided by some embodiments of this application. Embodiments of this application provide a battery 100, which includes multiple battery cells 20 and a heat insulation component, wherein the heat insulation component is disposed between two adjacent battery cells 20. The heat insulation component is an adhesive layer 30 connecting two adjacent battery cells 20.

[0068] A battery cell 20 refers to the smallest unit that makes up the battery 100. The battery cell 20 includes electrode terminals 22, which can be used to output electrical energy to the battery cell 20 or input electrical energy to the battery cell 20.

[0069] The number of battery cells 20 can be two, three, or more.

[0070] The heat insulation component is an adhesive layer 30 disposed between two adjacent battery cells 20. The adhesive layer 30 is adhesive and can bond the two adjacent battery cells 20 together. In addition, the adhesive layer 30 has low thermal conductivity, has good heat insulation performance, and can suppress heat conduction.

[0071] The battery 100 has a heat insulation component between two adjacent battery cells 20. This component provides thermal insulation, preventing heat from easily transferring to the other battery cell 20 in the event of thermal runaway in the latter. The heat insulation component is an adhesive layer 30 connecting the two adjacent battery cells 20. Therefore, during battery manufacturing, the adhesive layer 30 can be formed simply by applying adhesive to the battery cells 20 and pressing the two cells together, resulting in a simple process and low manufacturing cost.

[0072] Please refer to Figure 3 and Figure 4 , Figure 4 This is a schematic diagram of the structure of the battery 100 when the battery cell 20 expands according to some embodiments of this application. In some embodiments, the adhesive layer 30 is configured to buffer the amount of expansion of the battery cell 20.

[0073] During use, the battery cell 20 will expand. If the battery cell 20 is in rigid contact with other structures, the battery cell 20 cannot expand outward and will be subjected to greater compressive force, which will affect the performance of the battery cell 20.

[0074] The adhesive layer 30 has a certain degree of flexibility, which allows the battery cell 20 to expand outward without being subjected to excessive compressive force. This helps to reduce the risk of damage to the battery cell 20 and thus ensures the performance of the battery 100.

[0075] The expansion amount of battery cell 20 can be understood as the amount by which the volume of battery cell 20 increases when it expands compared to its volume during normal use.

[0076] In this embodiment, the adhesive layer 30 has a buffering effect, which can buffer the expansion of the battery cell 20 to reduce the risk of damage to the battery cell 20. At the same time, since the adhesive layer 30 has both heat insulation and buffering functions, one component can realize multiple functions, which helps to simplify the structure of the battery 100 and reduce the manufacturing cost of the battery 100.

[0077] In some embodiments, the adhesive layer 30 can deform under pressure to buffer the expansion of the battery cell 20. The volume of the adhesive layer 30 after deformation under pressure less than or equal to 10 MPa is V1, and the volume of the adhesive layer 30 before deformation is V2, satisfying: 50% ≤ V1 / V2 < 100%.

[0078] When the battery cell 20 expands, pressure is applied to the adhesive layer 30, causing the adhesive layer 30 to deform. Because the adhesive layer 30 can deform and has flexible contact with the battery cell 20, it allows the battery cell 20 to expand outward, buffering the expansion amount of the battery cell 20. The battery cell 20 is not subjected to large compressive forces, which helps to reduce the risk of damage to the battery cell 20, thereby ensuring the performance of the battery 100.

[0079] V1 represents the volume of adhesive layer 30 after deformation under pressure. V2 represents the volume of adhesive layer 30 before deformation under pressure. The volume of adhesive layer 30 after deformation under pressure is less than the volume of adhesive layer 30 before deformation under pressure, that is, V1 < V2.

[0080] V1 / V2 represents the ratio of the volume of adhesive layer 30 after deformation under pressure to its volume before deformation. The value of the ratio of the volume of adhesive layer 30 after deformation under pressure to its volume before deformation can be: V1 / V2 = 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc.

[0081] The greater the pressure applied to the adhesive layer 30, the greater its deformation, and correspondingly, the smaller its volume after deformation. For example, when the adhesive layer 30 is subjected to a pressure of 1 MPa, the ratio of its deformed volume to its undeformed volume can be: 85% ≤ V1 / V2 ≤ 90%. When the adhesive layer 30 is subjected to a pressure of 1–2 MPa, the ratio can be: 75% ≤ V1 / V2 ≤ 85%. When the adhesive layer 30 is subjected to a pressure of 2–10 MPa, the ratio can be: 50% ≤ V1 / V2 ≤ 75%.

[0082] When the battery cell 20 expands, pressure is applied to the adhesive layer 30, causing the adhesive layer 30 to deform. This deformation of the adhesive layer 30 buffers the expansion of the battery cell 20. The greater the pressure on the adhesive layer 30, the greater the deformation it can undergo. When the pressure on the adhesive layer is equal to 10 MPa, the minimum volume of the deformed adhesive layer 30 can be half of its original volume, thus providing a good buffering effect.

[0083] In some embodiments, the flame retardancy rating of the adhesive layer 30 is higher than V-2.

[0084] Flame retardancy rating is a classification system based on the property of a substance or the property of a material to significantly delay the spread of flame.

[0085] A flame retardant rating of V-2 means that after two 10-second burning tests on the sample, the flame extinguishes within 60 seconds. Burning material may fall off.

[0086] The flame retardant rating of adhesive layer 30 can be V-1, or it can be V-0.

[0087] The adhesive layer 30 has a flame-retardant effect, and its flame-retardant rating is higher than V-2. This means that when one battery cell 20 catches fire, the adjacent battery cell 20 is less likely to be ignited, giving the operator more time to react. Furthermore, the adhesive layer 30 provides heat insulation, flame retardancy, and cushioning; a single component performs multiple functions, thus simplifying the structure of the battery 100 and reducing its manufacturing cost.

[0088] In some embodiments, the flame retardancy rating of the adhesive layer 30 is V-0.

[0089] A flame retardant rating of V-0 means that after two 10-second burning tests on the sample, the flame extinguishes within 30 seconds. No burning material should fall off.

[0090] When the flame retardant rating of adhesive layer 30 is V-0, its flame retardant effect is better.

[0091] In some embodiments, the shear strength of the adhesive layer 30 is B, which satisfies: B≥1MPa.

[0092] B represents the shear strength of adhesive layer 30. The shear strength of adhesive layer 30 can be: B = 1 MPa, 1.5 MPa, 2 MPa, etc.

[0093] By ensuring that the shear strength of the adhesive layer 30 is greater than 1 MPa, the adhesive layer 30 is less likely to be damaged by shear force, which helps to ensure the heat insulation effect of the adhesive layer 30.

[0094] Please refer to Figure 3 and Figure 4 In some embodiments, the thickness of the adhesive layer 30 is C, which satisfies: 1mm≤C≤3mm.

[0095] Two battery cells 20 are arranged along a preset direction, and an adhesive layer 30 is disposed between the two battery cells 20. Along the preset direction, the adhesive layer 30 has a first surface and a second surface opposite to each other. The thickness of the adhesive layer 30 refers to the distance between the first surface and the second surface along the preset direction when the battery cell 20 has not expanded.

[0096] The thickness of the adhesive layer 30 can be: C = 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc.

[0097] Limiting the thickness of the adhesive layer 30 to within 1–3 mm ensures good flame retardancy without excessively occupying the internal space of the battery 100, thus maintaining the energy density of the battery 100. When C ≤ 1 mm, both its flame retardancy and buffering effects are poor (insufficient buffering distance). When C ≥ 3 mm, the thickness of the adhesive layer 30 is too large, occupying too much internal space of the battery 100 and reducing the energy density of the battery 100.

[0098] In some embodiments, C ≤ 2 mm.

[0099] The thickness of the adhesive layer 30 can be: C = 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0100] The thickness of the adhesive layer 30 is between 1 and 2 mm, which not only has good flame retardant and buffering effects, but also enables the battery 100 to have a high energy density.

[0101] Please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of the adhesive layer 30 connected to the connecting surface 21 in some embodiments of this application. Figure 6This is a schematic diagram illustrating the structure of the adhesive layer 30 connected to the connecting surface 21 in some other embodiments of this application. In some embodiments, the battery cell 20 has a connecting surface 21, which is the surface with the largest area on the outer surface of the battery cell 20. The adhesive layer 30 is connected to the connecting surface 21.

[0102] The connecting surface 21 is the largest surface area on the outer surface of the battery cell 20, commonly known as the large surface. For prismatic batteries, the battery cell 20 has two connecting surfaces 21 arranged opposite each other. The adhesive layer 30 can be connected to only one connecting surface 21 or to both connecting surfaces 21.

[0103] Since the connecting surface 21 is the largest surface area among the outer surfaces of the battery cell 20, it radiates a large amount of heat when the battery cell 20 experiences thermal runaway. Connecting the adhesive layer 30 to the connecting surface 21 provides a good heat insulation effect.

[0104] Please refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , Figure 7 This is a schematic diagram of the structure of the adhesive layer 30 connected to the connecting surface 21 in some embodiments of this application. Figure 8 This is a schematic diagram of the structure of the adhesive layer 30 connected to the connecting surface 21 in some embodiments of this application. Figure 9 This is a schematic diagram illustrating the structure of the adhesive layer 30 connected to the connection surface 21 in some other embodiments of this application. In some embodiments, the battery cell 20 has a connection surface 21, and the adhesive layer 30 is connected to the connection surface 21. The contact area between the adhesive layer 30 and the connection surface 21 is S1, and the area of ​​the connection surface 21 is S2, satisfying: 20% ≤ S1 / S2 ≤ 100%.

[0105] In the above embodiments, the connecting surface 21 may be the surface with the largest area on the outer surface of the battery cell 20, or it may not be the surface with the largest area on the outer surface of the battery cell 20.

[0106] Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The diagram illustrates various forms in which the adhesive layer 30 is attached to the connecting surface 21. In this diagram, the portion filled with grid lines represents the adhesive layer 30, and the contact area between the adhesive layer 30 and the connecting surface 21 is the area of ​​the grid-filled portion. The area of ​​the connecting surface 21 is the sum of the area of ​​the blank portion indicated in the diagram and the area of ​​the grid-filled portion. Specifically, for... Figure 5 In the embodiment shown, the adhesive layer 30 completely covers the connecting surface 21, and the contact area between the adhesive layer 30 and the connecting surface 21 is equal to the area of ​​the connecting surface 21.

[0107] The ratio of the contact area between the adhesive layer 30 and the connecting surface 21 to the area of ​​the connecting surface 21 can be: S1 / S2 = 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, etc.

[0108] The ratio of the contact area between the adhesive layer 30 and the connecting surface 21 to the area of ​​the connecting surface 21 is between 20% and 100% to ensure that the adhesive layer 30 has a good heat insulation effect while keeping costs low. Furthermore, the larger the value of S1 / S2, the better the heat insulation effect, but the cost increases accordingly. When S1 / S2 ≤ 20%, the contact area between the adhesive layer 30 and the connecting surface 21 is too small, resulting in poor heat insulation. When S1 / S2 > 100%, the adhesive layer 30 is too large, leading to waste and hindering cost reduction.

[0109] Please refer to Figure 6 In other embodiments, the battery cell 20 has a connecting surface 21, to which the adhesive layer 30 is connected. There is a distance between the adhesive layer 30 and the edge of the connecting surface 21.

[0110] In the above embodiments, the connecting surface 21 may be the surface with the largest area on the outer surface of the battery cell 20, or it may not be the surface with the largest area on the outer surface of the battery cell 20.

[0111] The fact that there is a distance between the adhesive layer 30 and the edge of the connecting surface 21 can also be understood as the adhesive layer 30 not being located at the edge of the connecting surface 21.

[0112] Optionally, the adhesive layer 30 is disposed in the middle of the connecting surface 21. In this case, the distance between the adhesive layer 30 and the upper and lower edges of the connecting surface 21 is equal, and the distance between the adhesive layer 30 and the left and right edges of the connecting surface 21 is also equal.

[0113] There is a distance between the adhesive layer 30 and the edge of the connecting surface 21. The adhesive layer 30 is set close to the middle of the connecting surface 21 to achieve a better heat insulation effect.

[0114] Please refer to Figure 7 In some other embodiments, the adhesive layer 30 is ring-shaped.

[0115] "Ring-shaped" can be circular or square (frame-like). Figure 7 In the embodiment shown, the adhesive layer 30 is square-shaped and is disposed along the edge of the connecting surface 21.

[0116] When the battery cell 20 expands, the center of the surface of the battery cell 20 usually bulges outward first. Since the adhesive layer 30 is annular, when the battery cell 20 expands, the bulging part can extend into the inner ring of the adhesive layer 30, thereby buffering the expansion of the battery cell 20.

[0117] Please refer to Figure 8 and Figure 9 In some embodiments, the adhesive layer 30 includes a first portion 31 and a second portion 32 that are not in contact, both of which are connected to two adjacent battery cells 20.

[0118] The adhesive layer 30 includes a first part 31 and a second part 32 that do not contact each other. The first part 31 and the second part 32 may be symmetrically arranged or not symmetrically arranged.

[0119] Please refer to Figure 8 The first part 31 is located on the right edge of the connecting surface 21, and the second part 32 is located on the left edge of the connecting surface 21. The first part 31 and the second part 32 are spaced apart in the left-right direction.

[0120] Please refer to Figure 9 The first part 31 is disposed on the upper edge of the connecting surface 21, and the second part 32 is disposed on the lower edge of the connecting surface 21. The first part 31 and the second part 32 are spaced apart in the vertical direction.

[0121] When the battery cell 20 expands, the protruding portion can extend between the first portion 31 and the second portion 32, thereby buffering the amount of expansion of the battery cell 20.

[0122] In some embodiments, the adhesive layer 30 comprises at least one of aerogel and epoxy acrylic system materials.

[0123] The adhesive layer 30 can be a single-component polymer aerogel or a mixture of aerogel and epoxy acrylic system materials.

[0124] Both aerogel and epoxy acrylic materials have good thermal insulation properties. In addition, aerogel also has good cushioning and flame retardancy, and its shear strength is also high.

[0125] This application embodiment also provides an electrical device, which includes the battery 100 described above, and the battery 100 is used to provide electrical energy to the electrical device.

[0126] According to some embodiments of this application, please refer to Figures 2-9 .

[0127] This application provides a battery 100, which includes multiple battery cells 20 and a heat insulation component. The heat insulation component is disposed between two adjacent battery cells 20. The heat insulation component is an adhesive layer 30 connecting two adjacent battery cells 20. The battery 100 has a heat insulation component between two adjacent battery cells 20, which provides a heat insulation effect. In the event of thermal runaway in one battery cell 20, its heat is not easily conducted to the other battery cell 20, thus preventing thermal runaway in the other battery cell 20. Since the heat insulation component is an adhesive layer 30 connecting two adjacent battery cells 20, the manufacturing process of the battery 100 only requires applying adhesive to the battery cells 20 and pressing two battery cells 20 together to form the adhesive layer 30, resulting in a simple process and low manufacturing cost.

[0128] The adhesive layer 30 is configured to buffer the expansion of the battery cells 20. During use, the battery cells 20 expand; without buffering between adjacent cells 20, one cell 20 is easily damaged by the pressure of another, thus affecting the performance of the battery 100. In this embodiment, the adhesive layer 30 provides buffering, reducing the risk of damage to the battery cells 20 and ensuring the performance of the battery 100. Furthermore, since the adhesive layer 30 provides both heat insulation and buffering, a single component can perform multiple functions, simplifying the structure of the battery 100 and reducing its manufacturing cost.

[0129] The flame retardant rating of adhesive layer 30 is V-0. When the flame retardant rating of adhesive layer 30 is V-0, its flame retardant effect is relatively good.

[0130] Layer 30 is a single-component polymer aerogel. Aerogel has good thermal insulation properties, as well as good cushioning and flame retardancy, and its shear strength is also high.

[0131] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: Multiple battery cells; A heat insulation element is disposed between two adjacent battery cells; The heat insulation component is an adhesive layer that connects two adjacent battery cells.

2. The battery as described in claim 1, characterized in that, The adhesive layer can deform under pressure. The volume of the adhesive layer after deformation under pressure less than or equal to 10 MPa is V1, and the volume of the adhesive layer before deformation is V2, satisfying: 50% ≤ V1 / V2 < 100%.

3. The battery as described in claim 1, characterized in that, The flame retardancy rating of the adhesive layer is higher than V-2.

4. The battery as described in claim 3, characterized in that, The flame retardancy rating of the adhesive layer is V-0.

5. The battery as described in claim 1, characterized in that, The shear strength of the adhesive layer is B, which satisfies: B≥1MPa.

6. The battery as described in claim 1, characterized in that, The thickness of the adhesive layer is C, which satisfies the following condition: 1mm≤C≤3mm.

7. The battery as described in claim 6, characterized in that, C≤2mm.

8. The battery as described in claim 1, characterized in that, The battery cell has a connecting surface, which is the surface with the largest area on the outer surface of the battery cell, and the adhesive layer is connected to the connecting surface.

9. The battery as described in claim 1, characterized in that, The battery cell has a connecting surface, and the adhesive layer is connected to the connecting surface. The contact area between the adhesive layer and the connecting surface is S1, and the area of ​​the connecting surface is S2, satisfying: 20% ≤ S1 / S2 ≤ 100%.

10. The battery according to any one of claims 1-9, characterized in that, The battery cell has a connecting surface, the adhesive layer is connected to the connecting surface, and there is a distance between the adhesive layer and the edge of the connecting surface.

11. The battery according to any one of claims 1-9, characterized in that, The adhesive layer is ring-shaped.

12. The battery according to any one of claims 1-9, characterized in that, The adhesive layer includes a first part and a second part that do not contact each other, and both the first part and the second part are connected to two adjacent battery cells.

13. The battery according to any one of claims 1-9, characterized in that, The adhesive layer includes at least one of aerogel and epoxy acrylic system materials.

14. An electrical appliance, characterized in that, Includes a battery as described in any one of claims 1-13, the battery being used to provide electrical power to the electrical device.

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