Battery and electric apparatus

Abstract

A battery (100) and an electric apparatus. The battery (100) comprises a plurality of battery cells (10) and a casing (20); the plurality of battery cells (10) are arranged within the casing (20), the casing (20) comprises a first casing wall (23), the first casing wall (23) comprises a support region (231) and an edge region (232) disposed around the support region (231), the support region (231) being configured for supporting the plurality of battery cells (10), the edge region (232) being provided with a protective structure (30), the protective structure (30) comprising a recess (31), the recess being recessed relative to a surface of the support region (231) facing the plurality of battery cells (10); and / or, the protective structure comprises a protrusion (32), the protrusion protruding from a surface of the support region (231) facing the plurality of battery cells (10), and at least a surface of the protrusion (32) facing the plurality of battery cells (10) being insulatingly arranged. The protective structure (30) is capable of extending or interrupting the creepage distance from the battery cells (10) to an edge of the casing (20), thereby solving the problem of insulation failure between the battery cells (10) and the casing (20) following thermal runaway.

Description

Battery and electric device

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202421577000.3, filed on July 5, 2024, entitled “Battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery production, in particular to a battery and an electric device. BACKGROUND

[0004] Batteries are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, electric tools, and the like.

[0005] In the development of battery technology, how to improve the reliability of the battery is a technical problem to be solved in the battery technology.

[0006] SUMMARY

[0007] The present application provides a battery and an electric device, which can improve the reliability of the battery to some extent.

[0008] In a first aspect, the present application provides a battery, comprising a plurality of battery monomers and a box body; the plurality of battery monomers are arranged in the box body, the box body comprises a first box wall, the first box wall comprises a support area and an edge area arranged around the support area, the support area is used for supporting the plurality of battery monomers, and the edge area is provided with a protection structure, wherein the protection structure comprises a concave part recessed relative to a surface of the support area facing the plurality of battery monomers; and / or the protection structure comprises a convex part protruding from a surface of the support area facing the plurality of battery monomers, and the convex part is at least arranged to be insulated relative to the surface of the plurality of battery monomers.

[0009] The battery provided by the present application, the edge area of the first box wall is provided with the protection structure, the protection structure comprises the concave part recessed relative to the surface of the support area facing the plurality of battery monomers and / or the convex part protruding from the surface of the support area facing the plurality of battery monomers, the creeping distance of the battery monomers reaching the edge of the box body is prolonged or blocked, the problem of insulation failure between the battery monomers and the box body after thermal runaway of the battery monomers is solved, the possibility of short circuit is reduced, and the reliability of the battery is improved. In addition, in the case where the protection structure comprises the concave part, condensation and directional collection of the electrolyte and thermal runaway products can be realized, and the risk of short circuit is further reduced.

[0010] According to an embodiment of the present application, the support area has a dimension along a first direction that is greater than a dimension along a second direction, the first direction, the second direction, and a thickness direction of the box wall are perpendicular to each other; and the support area is provided with a protection structure on both sides along the second direction.

[0011] According to an embodiment of the present application, the protection structure is spaced apart from the battery cell along the second direction.

[0012] In these optional embodiments, the protection structure is arranged in such a way that it can increase the creepage distance between more battery cells and the box, and greatly reduce the problem of insulation failure between the battery cells and the box after thermal runaway of the battery cells. In addition, the protection structure has a certain gap with the battery cell, which facilitates the installation of the battery cell into the box.

[0013] According to an embodiment of the present application, the protection structure extends along the first direction.

[0014] In these optional embodiments, the protection structure extends along the first direction, which improves the overall span of the protection structure in the first direction to reduce the possibility of short circuit connection.

[0015] According to an embodiment of the present application, the battery includes a plurality of protection structures, and the plurality of protection structures are spaced apart along the first direction.

[0016] In these optional embodiments, the plurality of protection structures are spaced apart along the first direction, which appropriately reduces the use space of the protection structure under the condition of meeting the overall large span of the protection structure, so as to not only enable the first box wall to have high structural strength, but also facilitate the lightweight of the first box wall.

[0017] According to an embodiment of the present application, the wall surface of the recess includes a first surface and two second surfaces, the second surfaces are arranged obliquely with respect to the thickness direction of the first box wall, and the first surface is connected to the two second surfaces.

[0018] In these optional embodiments, the second surfaces are arranged obliquely with respect to the thickness direction of the first box wall, and the obliquely arranged second surfaces not only can further improve the creepage distance, but also have a certain guiding effect to guide the electrolyte and thermal runaway products attached to the surface of the first box wall facing the battery cell into the recess.

[0019] According to an embodiment of the present application, at least part of the second surface is an arc surface.

[0020] In these optional embodiments, the arc surface has a regular shape, which is conducive to manufacturing and can reduce manufacturing costs to a certain extent.

[0021] According to an embodiment of the present application, the first box wall is provided with a protruding reinforcing portion on the side away from the battery cell, and the reinforcing portion corresponds in position to the recess.

[0022] In these optional embodiments, not only the structural strength can be enhanced, but also the internal space of the battery is not occupied additionally, which is beneficial to improve the energy density of the battery. The reinforcing part arranged outwardly can first absorb the energy of external impact when the external impact force is applied, so as to reduce the influence of the external impact on the position where the recess is located, and to avoid the damage of the position where the recess is located to a certain extent.

[0023] According to an embodiment of the present application, the material of the convex part is an insulating material.

[0024] In these optional embodiments, the battery monomer and the box body are insulated, the creeping path between the battery monomer and the box body is blocked, the insulation performance of the box body is increased, and the risk of short circuit is reduced more effectively.

[0025] According to an embodiment of the present application, the convex part comprises a metal base and an insulating layer covering at least the surface of the metal base facing the plurality of battery monomers.

[0026] In these optional embodiments, the convex part has a certain structural strength.

[0027] According to an embodiment of the present application, the metal base and the first box wall are integrally formed.

[0028] In these optional embodiments, the protective structure is simplified.

[0029] According to an embodiment of the present application, the minimum distance L between the protective structure and the battery monomer is greater than or equal to 2 mm.

[0030] In these optional embodiments, the minimum distance L between the protective structure and the battery monomer is greater than or equal to 2 mm, and the box body reserves a certain assembly tolerance to facilitate the assembly of the battery monomer.

[0031] According to an embodiment of the present application, the battery further comprises an isolation layer, and the isolation layer is attached to at least the edge region.

[0032] In these optional embodiments, the surface of the edge region is attached with the isolation layer, which can resist the corrosion of the electrolyte and the thermal runaway product. Even if the first box wall is immersed in the electrolyte, the box body has a certain insulation performance, thereby improving the reliability of the battery.

[0033] According to an embodiment of the present application, the battery further comprises an insulating glue, and a part of the insulating glue is located between the battery monomer and the support region, and another part of the insulating glue is located between the convex part and the battery monomer.

[0034] According to an embodiment of the present application, in the thickness direction of the first box wall, the height of the insulating glue located between the convex part and the battery monomer is not higher than the height of the convex part.

[0035] In the optional embodiments, the convex part is arranged to control the overflow height of the insulating glue, and reduce the influence of the overflowed insulating glue on other components.

[0036] In a second aspect, the application provides a power consuming device comprising the battery as described above, and the battery is used to provide electric energy.

[0037] The above description is only a summary of the technical solutions of the application. In order to enable one skilled in the art to better understand the technical means of the application and implement the same according to the contents of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0038] The features, advantages, and technical effects of the exemplary embodiments of the application will be described below with reference to the accompanying drawings.

[0039] Fig. 1 is a structural schematic diagram of a vehicle according to an embodiment of the application;

[0040] Fig. 2 is an exploded view of a battery according to an embodiment of the application;

[0041] Fig. 3 is a structural schematic diagram of the battery according to an embodiment of the application;

[0042] Fig. 4 is a structural schematic diagram of a battery comprising a protection structure according to an embodiment of the application;

[0043] Fig. 5 is a structural schematic diagram of a first box wall and a protection structure of a battery according to an embodiment of the application;

[0044] Fig. 6 is a sectional structural schematic diagram of the first box wall and the protection structure at b-b according to an embodiment of the application;

[0045] Fig. 7 is a structural schematic diagram of a battery comprising a protection structure according to another embodiment of the application;

[0046] Fig. 8 is a partial enlarged structural schematic diagram of the battery at A according to another embodiment of the application;

[0047] Fig. 9 is a structural schematic diagram of a first box wall and a protection structure of a battery according to another embodiment of the application;

[0048] Fig. 10 is a sectional structural schematic diagram of the first box wall and the protection structure at a-a according to another embodiment of the application;

[0049] Fig. 11 is a partial enlarged structural schematic diagram of the first box wall and the protection structure at C according to another embodiment of the application;

[0050] Fig. 12 is a structural schematic diagram of a battery comprising a protection structure according to still another embodiment of the application;

[0051] FIG. 13 is a partial enlarged structural schematic view of the battery of the still another embodiment shown in FIG. 12 at B;

[0052] The accompanying drawings are not necessarily drawn to scale.

[0053] Explanation of Reference Signs:

[0054] 1000, vehicle;

[0055] 100, battery; 200, controller; 300, motor;

[0056] 10, battery cell;

[0057] 20, case; 21, first case; 22, second case; 23, first case wall; 231, support area; 232, edge area; 24, reinforcement;

[0058] 30, protection structure; 31, recess; 311, first surface; 312, second surface; 32, protrusion;

[0059] 40, separation layer;

[0060] 50, insulating adhesive;

[0061] x, first direction; y, second direction; z, thickness direction. DETAILED DESCRIPTION

[0062] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0063] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0064] Reference to an "example" in this application means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same example, nor are they necessarily mutually exclusive or alternative examples to one another.

[0065] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0066] The term "and / or" in this application is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0067] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0068] "Multiple" appearing in this application means more than two (including two).

[0069] In this application, the battery cell can 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. The embodiments of the application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the application are also not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft package battery cell, etc. The embodiments of the application are also not limited thereto.

[0070] The battery referred to in the embodiments of the application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery cells. The box can reduce the influence of liquid or other foreign matters on the charging or discharging of the battery cell to a certain extent.

[0071] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode.

[0072] In the related art, a battery includes a case and battery cells, the battery cells generate heat during charging and discharging, and excessive heat accumulation can cause thermal runaway of the battery cells. The case has a nearly planar structure for supporting the bottom of the battery cells. When the battery cells undergo thermal runaway, the conductive electrolyte and thermal runaway products cover the surface of the bottom to form a conductive layer, which shortens the creepage distance between the battery cells and the case, and further causes insulation failure between the battery cells and the case. The insulation failure is characterized by an insulation resistance < 1000 Ω / V, which causes a short circuit risk and reduces the service life and reliability of the battery. The above statements are only used to provide background information related to the present application, and do not necessarily constitute the prior art.

[0073] In view of the above problems, the inventors have conducted in-depth research and proposed a battery. The edge region of the first case wall is provided with a protective structure. The protective structure includes a recessed portion recessed relative to the surface of the support region and facing the plurality of battery cells, and / or a protruding portion protruding from the surface of the support region and facing the plurality of battery cells. The protective structure prolongs or blocks the creepage distance of the battery cells to the edge of the case, solves the problem of insulation failure between the battery cells and the case after thermal runaway of the battery cells, reduces the possibility of short circuit, and thus improves the reliability of the battery. In addition, in the case where the protective structure includes a recessed portion, the condensation and directional collection of the electrolyte and thermal runaway products can be achieved, further reducing the risk of short circuit.

[0074] The battery can be applied to vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys, and electric tools, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or an extended range automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The above tab production equipment is not specially limited in the embodiments of the present application.

[0075] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0076] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0077] Referring to FIG. 1, an embodiment of the present application provides a vehicle 1000. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. In an embodiment of the present application, the vehicle 1000 can include a motor 300, a controller 200, and a battery. The controller 200 is used to control the battery to supply power to the motor 300. The motor 300 is connected to the wheels through a transmission mechanism, thereby driving the vehicle 1000 to travel. The battery can be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000. In one example, the battery can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery can be used to supply power to the vehicle 1000. In one example, the battery can be used as an operating power source of the vehicle 1000, for the circuit system of the vehicle 1000. For example, the battery can be used for the power demand of starting, navigation, and operation of the vehicle 1000.

[0078] Referring to FIG. 2, FIG. 2 is an exploded view of the battery provided in some embodiments of the present application.

[0079] The present application provides a battery 100, which includes a box 20 and a plurality of battery monomers 10. The plurality of battery monomers 10 are arranged in the box 20.

[0080] In some embodiments, the box 20 can include a first box 21 and a second box 22, the first box 21 and the second box 22 are mutually covered, and the first box 21 and the second box 22 jointly define a containing space for containing the battery monomers 10. The second box 22 can be a hollow structure with one end open, and the first box 21 can be a plate structure, the first box 21 is covered on the open side of the second box 22, so that the first box 21 and the second box 22 jointly define the containing space; the first box 21 and the second box 22 can also be hollow structures with one side open, and the open side of the first box 21 is covered on the open side of the second box 22. Of course, the box 20 formed by the first box 21 and the second box 22 can be various shapes, such as a cylinder, a cuboid, etc.

[0081] In the battery 100, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 10 are connected in series and in parallel. The plurality of battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the plurality of battery cells 10 is accommodated in the case 20. Of course, the battery 100 can be such that the plurality of battery cells 10 are connected in series, in parallel, or in a mixed connection to form a battery module, and the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the case 20. The battery 100 can further include other structures. For example, the battery 100 can further include a busbar member for electrically connecting the plurality of battery cells 10.

[0082] Each battery cell 10 can be a lithium-ion battery cell, a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 10 can have a cylindrical shape, a flat shape, a cuboid shape, or another shape.

[0083] Referring to FIGS. 3 to 7, FIG. 3 is a structural schematic view of a battery according to an embodiment of the present application; FIG. 4 is a structural schematic view of a battery including a protection structure according to an embodiment of the present application; FIG. 5 is a structural schematic view of a first case wall and a protection structure of a battery according to an embodiment of the present application; FIG. 6 is a cross-sectional structural schematic view of the first case wall and the protection structure of FIG. 5 at b-b; and FIG. 7 is a structural schematic view of a battery including a protection structure according to another embodiment of the present application.

[0084] As shown in FIGS. 3 and 7, in some embodiments, the case 20 includes a first case wall 23 including a support area 231 for supporting the plurality of battery cells 10 and an edge area 232 disposed around the support area 231, and the edge area 232 is provided with a protection structure 30. The protection structure 30 includes a recess 31 recessed with respect to a surface of the support area 231 facing the plurality of battery cells 10.

[0085] As shown in FIGS. 3 and 4, in other embodiments, the case 20 includes a first case wall 23 including a support area 231 for supporting the plurality of battery cells 10 and an edge area 232 disposed around the support area 231, and the edge area 232 is provided with a protection structure 30. The protection structure 30 includes a protrusion 32 protruding from a surface of the support area 231 facing the plurality of battery cells 10, and the protrusion 32 is at least insulated from the surface of the plurality of battery cells 10.

[0086] In some embodiments, the box 20 comprises a first box wall 23, the first box wall 23 comprises a support area 231 for supporting the plurality of battery cells 10 and a rim area 232 surrounding the support area 231, and the rim area 232 is provided with the protection structure 30. The protection structure 30 comprises a recess 31 and a protrusion 32, the recess 31 is recessed relative to a surface of the support area 231 facing the plurality of battery cells 10, and the protrusion 32 is protruded relative to a surface of the support area 231 facing the plurality of battery cells 10, and the protrusion 32 is insulated at least from the surface facing the plurality of battery cells 10.

[0087] In some embodiments, the box 20 comprises a first box wall 23, the first box wall 23 is used for supporting the plurality of battery cells 10.

[0088] For example, when the box 20 is a cylinder, the first box wall 23 is arranged on one side of the plurality of battery cells 10 in the thickness direction z of the first box wall 23 and is used for supporting the plurality of battery cells 10, and it can be understood that the first box wall 23 is a bottom wall extending in a horizontal direction.

[0089] For example, when the box 20 is a cuboid, the first box wall 23 is arranged on one side of the plurality of battery cells 10 in the thickness direction z of the first box wall 23 and is used for supporting the plurality of battery cells 10, and it can be understood that the first box wall 23 is a bottom wall extending in a horizontal direction.

[0090] In some embodiments, the first box wall 23 comprises a support area 231 for supporting the plurality of battery cells 10 and a rim area 232 surrounding the support area 231, and the rim area 232 is provided with the protection structure 30. Specifically, the support area 231 can be generally rectangular, and the rim area 232 surrounding the support area 231 can be a rectangular frame structure or a ring frame structure. The plurality of battery cells 10 are arranged in rows in the support area 231, or the plurality of battery cells 10 are arranged in columns in the support area 231, or the plurality of battery cells 10 are arranged in rows and columns in the support area 231.

[0091] In the embodiments of the present application, the edge area 232 is provided with a protection structure 30, the protection structure 30 includes a recess 31 and / or a protrusion 32, the recess 31 is recessed relative to the surface of the support area 231 facing the plurality of battery monomers 10, the protrusion 32 is protruded relative to the surface of the support area 231 facing the plurality of battery monomers 10, and the protrusion 32 is at least insulated relative to the surface of the plurality of battery monomers 10. Wherein, the protection structure 30 is arranged in the edge area 232, the protection structure 30 can be arranged spaced apart from the battery monomer 10, or the protection structure 30 is in contact with the battery monomer 10. The protection structure 30 is recessed or protruded relative to the surface of the support area 231 facing the plurality of battery monomers 10, which is conducive to increasing or blocking the creeping distance of the battery monomer 10 to the edge of the box 20, thereby solving the problem of insulation failure between the battery monomer 10 and the box 20. Moreover, the recess 31 is recessed relative to the surface of the support area 231 facing the plurality of battery monomers 10, when the battery monomer 10 is out of control, the recess 31 can realize condensation and directional collection of the conductive electrolyte and thermal runaway products.

[0092] The recess 31 includes a groove or a recess hole, and the structure of the recess 31 can be a rectangular structure, a rhombic structure, a triangular structure, a cylindrical structure, a circular ring structure or other shape structures.

[0093] The protection structure 30 includes one recess 31 or a plurality of recesses 31. In the case that the protection structure 30 includes a plurality of recesses 31, the plurality of recesses 31 can be independently arranged, that is, the plurality of recesses 31 are arranged spaced apart; or, at least two recesses 31 of the plurality of recesses 31 are arranged intersected.

[0094] Exemplarily, the protection structure 30 includes a plurality of recesses 31, and the plurality of recesses 31 are uniformly and spaced apart distributed.

[0095] The protrusion 32 includes a bump or a boss, and the structure of the protrusion 32 can be a rectangular structure, a rhombic structure, a conical structure, a cylindrical structure, a circular ring structure or other shape structures.

[0096] The protrusion 32 is at least insulated relative to the surface of the plurality of battery monomers 10, the protrusion 32 can be made of an insulating material, or the protrusion 32 relative to the surface of the plurality of battery monomers 10 can be further provided with an insulating member.

[0097] The battery 100 provided in the application, the edge area 232 of the first box wall 23 is provided with a protection structure 30, the protection structure 30 includes a recess 31 recessed relative to the surface of the support area 231 facing the plurality of battery monomers 10 and / or a convex part 32 convex to the surface of the support area 231 facing the plurality of battery monomers 10, which prolongs or blocks the creeping distance of the battery monomer 10 to the edge of the box 20, solves the problem of insulation failure between the battery monomer 10 and the box 20 after thermal runaway, reduces the possibility of short circuit, and improves the reliability of the battery. In addition, in the case where the protection structure 30 includes the recess 31, condensation and directional collection of electrolyte and thermal runaway products can be achieved, further reducing the risk of short circuit.

[0098] As shown in FIG. 3 and FIG. 7, according to one embodiment of the application, the size of the support area 231 along the first direction x is greater than the size of the support area 231 along the second direction y, and the first direction x, the second direction y and the thickness direction z of the box wall are perpendicular to each other. The protection structure 30 is arranged on both sides of the support area 231 along the second direction y.

[0099] Exemplarily, the protection structure 30 is also arranged on at least one side of the protection structure 30 along the first direction x.

[0100] Exemplarily, the protection structure 30 is arranged on both sides of the protection structure 30 along the second direction y and along the first direction x, respectively.

[0101] In the embodiment of the application, at least part of the plurality of battery monomers 10 are arranged in a stacked manner along the first direction x. Specifically, the battery monomer 10 includes at least one battery pack, a plurality of battery packs are arranged along the second direction y, and the battery pack includes a plurality of battery monomers 10 arranged in a stacked manner along the first direction x.

[0102] Exemplarily, the support area 231 has a predetermined length and width, the length direction is the first direction x, and the width direction is the second direction y, wherein at least part of the battery monomers 10 are arranged in a stacked manner along the first direction x.

[0103] According to one embodiment of the application, the protection structure 30 is arranged spaced apart from the battery monomer 10 along the second direction y.

[0104] In the embodiment of the application, the size of the support area 231 along the first direction x is greater than the size of the support area 231 along the second direction y, so that more battery monomers 10 are arranged in the first direction x, and the protection structure 30 is arranged spaced apart from the battery monomer 10 along the second direction y, so that the protection structure 30 can increase the creeping distance of more battery monomers 10 from the box 20, and greatly reduce the problem of insulation failure between the battery monomer 10 and the box 20 after thermal runaway.

[0105] Optionally, the battery 100 comprises a plurality of protective structures 30 arranged along the second direction y.

[0106] In these optional embodiments, the protective structures 30 are arranged so as to increase the creepage distance of more battery monomers 10 from the box 20, and to reduce the problem of insulation failure between the battery monomers 10 and the box 20 after thermal runaway of the battery monomers 10. In addition, the protective structures 30 have a certain gap from the battery monomers 10, which facilitates the installation of the battery monomers 10 into the box.

[0107] As shown in FIGS. 3, 4 and 7, according to one embodiment of the present application, the protective structures 30 extend along the first direction x.

[0108] In the embodiments of the present application, the protective structures 30 extend along the first direction x, thereby increasing the overall span of the protective structures 30. Specifically, the N battery monomers 10 arranged in stacks are arranged along the first direction x on the support area 231, and the protective structures 30 are arranged opposite to the N battery monomers 10 along the second direction y.

[0109] Optionally, the total length of the protective structures 30 along the first direction x is greater than or equal to the size of the support area 231 along the first direction x, and less than the size of the edge area 232 along the first direction x.

[0110] For example, the protective structures 30 comprise protrusions 32 extending along the first direction x. In the case where the protective structures 30 comprise the protrusions 32, it is not only beneficial to increase the creepage distance, but also beneficial to increase the strength of the first box wall 23, thereby improving the reliability of the box 20.

[0111] For example, the protective structures 30 comprise recesses 31 extending along the first direction x.

[0112] In these optional embodiments, the protective structures 30 extend along the first direction x, thereby increasing the overall span of the protective structures 30 in the first direction x, so as to reduce the possibility of short circuit connection.

[0113] Referring to FIG. 8, FIG. 8 is a partial enlarged structural schematic view of the battery shown in FIG. 7 at A.

[0114] According to one embodiment of the present application, as shown in FIGS. 7 and 8, the wall surface of the recess 31 comprises a first surface 311 and two second surfaces 312. The second surfaces 312 are arranged obliquely with respect to the thickness direction z of the first box wall 23, and the first surface 311 is connected to the two second surfaces 312.

[0115] Generally, the side of the first box wall 23 facing away from the battery cell 10 is provided with a heat exchange member to cool the whole battery 100. The bottom wall of the recess 31 provided in the first box wall 23 is closer to the heat exchange member, and thus the temperature of the recess 31 area is lower than that of other areas. When thermal runaway occurs in a certain battery cell 10, the volatilized electrolyte and thermal runaway products can be condensed and collected in the recess 31.

[0116] Specifically, the first box wall 23 has an upper surface facing the battery cell 10 along the thickness direction z, the wall surface of the recess 31 includes a first surface 311 and two second surfaces 312, the first surface 311 is connected to the two second surfaces 312, one end of the second surface 312 is connected to the upper surface, and the other end is connected to the first surface 311, and the second surface 312 is inclined with respect to the thickness direction z of the first box wall 23; one end of the first surface 311 is connected to one second surface 312, and the other end is connected to the other second surface 312. Specifically, the first surface 311 is a plane, and can also be an arc surface, and the second surface 312 can be a plane, and can also be an arc surface.

[0117] In these optional embodiments, the second surface 312 arranged obliquely not only can further improve the creepage distance, but also has a certain guiding effect to guide the electrolyte and thermal runaway products attached to the surface of the first box wall 23 facing the battery cell 10 into the recess 31.

[0118] In some embodiments, the depth of the recess 31 is greater than or equal to 3 mm and less than the thickness of the first box wall 23.

[0119] According to an embodiment of the present application, at least part of the second surface 312 is an arc surface.

[0120] In these optional embodiments, the arc surface has a regular shape, which is beneficial to manufacturing and can reduce manufacturing cost to a certain extent.

[0121] Referring to FIGS. 9-11, FIG. 9 is a structural schematic view of a first box wall and a protection structure of a battery according to another embodiment of the present application; FIG. 10 is a cross-sectional structural schematic view of the first box wall and the protection structure of another embodiment shown in FIG. 9 at a-a; and FIG. 11 is a local enlarged structural schematic view of the first box wall and the protection structure of another embodiment shown in FIG. 10 at C.

[0122] According to an embodiment of the present application, as shown in FIGS. 9-11, the side of the first box wall 23 facing away from the battery cell 10 is provided with a protruding reinforcing portion 24, which corresponds to the position of the recess 31.

[0123] In the embodiments of the present application, the reinforcing portion 24 is arranged protruding from the surface of the first box wall 23 facing away from the battery cell 10 to form a protrusion on the surface of the first box wall 23 facing away from the battery cell 10, and the edge area 232 is provided with the recess 31 at the position corresponding to the reinforcing portion 24. Due to the provision of the recess 31, the first box wall 23 in the area of the recess 31 is weak in structural strength relative to other areas. Therefore, by providing the reinforcing portion 24, the structural strength of the first box wall 23 can be improved without changing the overall thickness of the first box wall 23.

[0124] Exemplarily, the edge area 232 of the first box wall 23 is partially punched in the direction from the inner surface facing the battery cell 10 to the outer surface facing away from the battery cell 10, forming the recess 31 on the inner surface and the protrusion on the outer surface, and the protrusion forms the reinforcing portion 24.

[0125] In these alternative embodiments, not only the structural strength can be reinforced, but also the internal space of the battery 100 is not additionally occupied, which is beneficial to improve the energy density of the battery 100. The reinforcing portion 24 arranged protruding outward can first absorb the energy of external impact when subjected to external impact force, so as to reduce the influence of external impact on the position where the recess 31 is located, and to a certain extent, avoid the position where the recess 31 is located from being damaged due to external impact.

[0126] According to one embodiment of the present application, the material of the protrusion 32 is an insulating material.

[0127] Exemplarily, the insulating material can be plastic, rubber, etc.

[0128] Alternatively, the protrusion 32 is made of insulating material and also needs to have a certain structural strength. When the battery cell 10 is assembled into the box 20, the battery cell 10 extrudes the insulating glue 50 used for bonding the battery cell 10 and the box 20, and the protrusion 32 does not bend and deform after overflow of the glue.

[0129] In these alternative embodiments, the battery cell 10 and the box 20 are thus arranged to be insulated, which can block the creeping path between the battery cell 10 and the box 20, increase the insulation performance of the box 20, and more effectively reduce the risk of short circuit.

[0130] According to one embodiment of the present application, the height of the protrusion 32 in the thickness direction z of the box wall is greater than or equal to 5 mm.

[0131] In some embodiments, the height of the protrusion 32 in the thickness direction z of the box wall is greater than or equal to 5 mm and less than the height of the battery cell 10.

[0132] Optionally, the height of the protrusion 32 along the thickness direction z of the box wall is 5mm to 15mm. The protrusion 32 has a suitable height, not only increasing the creepage distance, but also appropriately reducing the weight and space occupied by the protrusion 32.

[0133] According to one embodiment of the present application, the protrusion 32 comprises a metal base and an insulating layer covering at least the surface of the metal base facing the plurality of battery monomers 10.

[0134] In the embodiments of the present application, the protrusion 32 comprises a metal base and an insulating layer, the metal base protrudes from the first box wall 23, and the insulating layer covers at least the surface of the metal base facing the plurality of battery monomers 10. The metal base can improve the connection stability with the first box wall 23 and endow the protrusion 32 with a certain structural strength. In addition, the metal base can also be an integral molding structure with the first box wall 23, facilitating manufacturing and forming.

[0135] Optionally, the insulating layer covers the surface of the metal base.

[0136] In these optional embodiments, the protrusion 32 is arranged to have a certain structural strength.

[0137] According to one embodiment of the present application, the metal base is an integral molding structure with the first box wall 23.

[0138] Specifically, the outer surface of the first box wall 23 facing away from the battery monomer 10 is provided with a recess recessed inward, and the recess is positionally corresponding to the protrusion 32.

[0139] Illustratively, part of the edge area 232 of the first box wall 23 is punched from the outer surface facing away from the battery monomer 10 to the direction of the inner surface facing the battery monomer 10, forming the protrusion 32 on the inner surface and the recess on the outer surface.

[0140] In these optional embodiments, the arrangement simplifies the protection structure 30.

[0141] According to one embodiment of the present application, as shown in FIG. 9, the minimum distance L between the protection structure 30 and the battery monomer 10 is greater than or equal to 2mm.

[0142] Optionally, the minimum distance L between the protection structure 30 and the battery monomer 10 is 2mm to 10mm.

[0143] In some embodiments, when the protection structure 30 includes the protrusion 32, by adjusting the minimum distance L between the protection structure 30 and the battery cell 10, the height of the overflowed insulation glue 50 can also be controlled, that is, the height of the insulation glue 50 between the battery cell 10 and the protrusion 32 is inversely proportional to the minimum distance L between the protection structure 30 and the battery cell 10, the greater the minimum distance L between the protection structure 30 and the battery cell 10, the lower the height of the insulation glue 50, and vice versa, the smaller the minimum distance L between the protection structure 30 and the battery cell 10, the higher the height of the insulation glue 50.

[0144] In some embodiments, the protection structure 30 on the first box wall 23 is manufactured first, and then the battery cell 10 is installed into the box 20.

[0145] In these alternative embodiments, the minimum distance L between the protection structure 30 and the battery cell 10 is greater than or equal to 2 mm, and the box 20 has a certain assembly tolerance to facilitate the assembly of the battery cell 10.

[0146] According to an embodiment of the present application, the width of the protection structure 30 in the direction from the support area 231 to the edge area 232 is greater than or equal to 5 mm.

[0147] Alternatively, the width of the protection structure 30 in the direction from the support area 231 to the edge area 232 is 5 mm to 20 mm.

[0148] According to an embodiment of the present application, as shown in FIGS. 10 and 11, the battery 100 further includes an isolation layer 40, and the isolation layer 40 is attached to at least the edge area 232.

[0149] Alternatively, the material of the isolation layer 40 is polyimide.

[0150] In these alternative embodiments, the surface of the edge area 232 is attached with the isolation layer 40, which can resist the corrosion of the electrolyte and the thermal runaway products, that is, even if the first box wall 23 is immersed in the electrolyte, the box 20 has a certain insulation performance, thereby improving the reliability of the battery 100.

[0151] According to an embodiment of the present application, as shown in FIGS. 4 and 6, the battery 100 further includes an insulation glue 50, and a part of the insulation glue 50 is located between the battery cell 10 and the support area 231, and another part of the insulation glue 50 is located between the protrusion 32 and the battery cell 10.

[0152] In the embodiment of the present application, the box 20 is provided with the insulating glue 50, which is used to bond the battery monomer 10 and the first box wall 23. During the process of putting the battery monomer 10 into the box, the insulating glue 50 on the first box wall 23 is pressed by the battery monomer 10, and a part of the insulating glue 50 is located between the battery monomer 10 and the supporting area 231 to bond the battery monomer 10 and the first box wall 23, and another part of the insulating glue 50 is blocked by the convex part 32 and is located between the convex part 32 and the battery monomer 10. Moreover, the convex part 32 can also control the height of the insulating glue 50 located between the convex part 32 and the battery monomer 10, and can realize that the insulating glue 50 can completely cover the closing position of the blue film of the battery monomer 10.

[0153] Optionally, in the thickness direction z, the height of the insulating glue 50 located between the convex part 32 and the battery monomer 10 is higher than the height of the insulating glue 50 located between the battery monomer 10 and the supporting area 231.

[0154] According to one embodiment of the present application, in the thickness direction z of the first box wall 23, the height of the insulating glue 50 located between the convex part 32 and the battery monomer 10 is not higher than the height of the convex part 32.

[0155] In these optional embodiments, the convex part 32 can control the overflow height of the insulating glue 50, and reduce the influence of the overflow of the insulating glue 50 on other components.

[0156] Referring to FIG. 12 and FIG. 13, FIG. 12 is a structural schematic diagram of a battery provided by another embodiment of the present application and comprising a protection structure; and FIG. 13 is a partial enlarged structural schematic diagram of the battery of another embodiment shown in FIG. 12 at B.

[0157] According to one embodiment of the present application, as shown in FIG. 12 and FIG. 13, the battery comprises a plurality of protection structures 30, and the plurality of protection structures 30 are arranged at intervals along the first direction x.

[0158] Specifically, N battery monomers 10 are arranged along the first direction x, and correspondingly, the battery 100 comprises N protection structures 30, and the N protection structures 30 are arranged correspondingly to the N battery monomers 10. The length of each protection structure 30 along the first direction x is less than the length of each battery monomer 10 along the first direction x.

[0159] Optionally, the plurality of protection structures 30 are arranged at equal intervals along the first direction x.

[0160] Exemplarily, the protection structure 30 comprises a plurality of convex parts 32, and the plurality of convex parts 32 are arranged at intervals along the first direction x.

[0161] Exemplarily, the protection structure 30 comprises a plurality of recesses 31, which are arranged along the first direction x. In this way, the first box wall 23 as a whole has higher structural strength, so as to reduce the influence of excessive recesses 31 on the strength of the first box wall 23.

[0162] In these optional embodiments, the plurality of protection structures 30 are arranged along the first direction x, which appropriately reduces the use space of the protection structure 30 under the condition that the overall span of the protection structure 30 is large, so as to not only enable the first box wall 23 to have higher structural strength, but also facilitate the lightweight of the first box wall 23.

[0163] In a second aspect, the present application provides a power utilization device, which comprises the battery according to the foregoing.

[0164] According to some embodiments of the present application, referring to FIGS. 7-11, the present application provides a battery 100, which comprises a plurality of battery monomers 10, a box 20, and an isolation layer 40.

[0165] The plurality of battery monomers 10 are arranged in the box 20.

[0166] The box 20 comprises a first box wall 23, which comprises a support area 231 and an edge area 232 arranged around the support area 231. The support area 231 is used to support the plurality of battery monomers 10, and the dimension of the support area 231 along the first direction x is greater than the dimension of the support area 231 along the second direction y. The first direction x, the second direction y, and the thickness direction z of the first box wall 23 are perpendicular to each other. The edge area 232 is provided with a protection structure 30, which is arranged along the second direction y away from the battery monomers 10 and extends along the first direction x. The protection structure 30 comprises a recess 31, which is recessed relative to the surface of the support area 231 facing the plurality of battery monomers 10. The wall surface of the recess 31 comprises a first surface 311 and two second surfaces 312, which are arranged obliquely relative to the thickness direction z of the first box wall 23, and the first surface 311 is connected to the two second surfaces 312. The minimum distance L between the recess 31 and the battery monomers 10 is equal to 2 mm. In the second direction y, the width of the recess 31 is equal to 5 mm. The depth of the recess 31 is equal to 3 mm. The side of the first box wall 23 away from the battery monomers 10 is provided with a protruding reinforcing portion 24, which is arranged in position corresponding to the recess 31.

[0167] The isolation layer 40 is attached to at least the edge area 232.

[0168] Although the present application has been described with reference to preferred embodiments, it is to be understood that various modifications can change the scope of the present application to the full extent the equivalent thereof are intended to be within this application, and that each of the technical features mentioned in the various embodiments can be combined in an arbitrary manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising: a plurality of battery cells; a case in which the plurality of battery cells are disposed, the case comprising a first case wall, the first case wall comprising a support region for supporting the plurality of battery cells and an edge region disposed around the support region, the edge region being provided with a protection structure, wherein the protection structure comprises a recessed portion recessed with respect to a surface of the support region facing the plurality of battery cells; and / or the protection structure comprises a protruding portion protruding with respect to a surface of the support region facing the plurality of battery cells, the protruding portion being insulated at least from the surface of the plurality of battery cells. 2.The battery of claim 1, wherein a dimension of the support region along a first direction is greater than a dimension of the support region along a second direction, the first direction, the second direction, and a thickness direction of the first case wall being perpendicular to each other; and the protection structure is provided on both sides of the support region along the second direction. 3.The battery of claim 2, wherein the protection structure is spaced apart from the battery cells along the second direction. 4.The battery of claim 2 or 3, wherein the protection structure extends along the first direction. 5.The battery of claim 2 or 3, wherein the battery comprises a plurality of the protection structures, the plurality of the protection structures being spaced apart along the first direction. 6.The battery of any one of claims 1-5, wherein a wall surface of the recessed portion comprises a first surface and two second surfaces, the second surfaces being disposed obliquely with respect to the thickness direction of the first case wall, the first surface being connected to the two second surfaces. 7.The battery of claim 6, wherein at least part of the second surfaces are curved surfaces. 8.The battery of any one of claims 1-7, wherein a side of the first case wall facing away from the battery cells is provided with a protruding reinforcing portion, the reinforcing portion corresponds in position to the recessed portion. 9.The battery of any one of claims 1-8, wherein a material of the protruding portion is an insulating material. 10.The battery of any one of claims 1-9, wherein the protruding portion comprises a metal base and an insulating layer covering at least a surface of the metal base facing the plurality of battery cells. 11.The battery of claim 10, wherein the metal base and the first case wall are integrally formed. 12.The battery of any one of claims 1-11, wherein a minimum distance L between the protection structure and the battery cells is greater than or equal to 2 mm. 13.The battery of any one of claims 1-12, wherein the battery further comprises an isolation layer attached at least to the edge region. 14.The battery of any one of claims 1-13, wherein the battery further comprises an insulating adhesive, a portion of the insulating adhesive being located between the battery cells and the support region, and another portion of the insulating adhesive being located between the protruding portion and the battery cells. 15.The battery of claim 14, wherein ​ In a thickness direction of the first case wall, a height of the insulating adhesive between the protrusion and the battery cell is not higher than a height of the protrusion.

16. An electrical device, comprising: A battery comprising the battery according to any one of claims 1 to 15, the battery being configured to provide electrical energy.

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