Battery and electric equipment

Abstract

The embodiment of the utility model provides a battery and electric equipment, the battery comprises a plurality of battery monomers and at least one insulating sheet, each battery monomer comprises a shell, and the shell is provided with a first wall; and each insulating sheet is adhered to the outer surfaces of the first walls of the plurality of battery monomers.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] Batteries are widely used in fields such as portable electronic devices, electric transportation vehicles, electric tools, drones, energy storage devices, etc. How to improve the production efficiency of batteries is an urgent technical problem in battery technology. Summary of the Utility Model

[0004] The present application provides a battery and an electrical device, which can improve the production efficiency of the battery.

[0005] The present application is implemented by the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery, including a plurality of battery cells and at least one insulating sheet. The battery cell includes a housing having a first wall; each insulating sheet is bonded to the outer surface of the first wall of the plurality of battery cells.

[0007] For the battery according to the embodiment of the present application, each insulating sheet is bonded to the outer surface of the plurality of first battery cells. Therefore, only one process is required to bond one insulating sheet to the outer surface of the first wall of the plurality of battery cells. During the production process of the battery, a large number of processes are saved, thereby greatly improving the production efficiency of the battery.

[0008] According to some embodiments of the present application, the insulating sheet is of an integral structure.

[0009] In the above solution, the production efficiency of the insulating sheet can be improved.

[0010] According to some embodiments of the present application, the insulating sheet includes a body portion and a buffer portion. The body portions are multiple, and the multiple body portions are arranged along a first direction. Adjacent two body portions are connected by the buffer portion, and each body portion is bonded to at least one battery cell.

[0011] In the above solution, two adjacent body parts are connected by a buffer part, and the buffer part can absorb part of the energy when the two adjacent body parts move relative to each other. Since each body part is bonded to at least one battery cell, when relative displacement occurs between multiple battery cells bonded by two adjacent body parts along the first direction, the buffer part can absorb part of the energy and slow down the phenomenon that the two adjacent battery cells squeeze each other or even damage the battery cells.

[0012] According to some embodiments of the present application, the housing has a second wall perpendicular to the first direction, and the second wall is the wall with the largest area of the housing.

[0013] In the above solution, some (at least two) of the multiple battery cells bonded by two adjacent body parts can be arranged in the first direction, and the first direction is the thickness direction of the battery cell. When the battery cell expands due to normal use or thermal runaway, the expansion direction is mainly the thickness direction of the battery cell (i.e., the first direction). The buffer part is arranged between two adjacent body parts in the first direction, and the buffer part can play a buffering role to slow down the phenomenon that two adjacent battery cells squeeze each other or even damage the battery cells in the first direction.

[0014] According to some embodiments of the present application, each body part is bonded to multiple battery cells, and the multiple battery cells bonded to the same body part are arranged along the second direction, and the first direction is perpendicular to the second direction.

[0015] In the above solution, the multiple battery cells bonded to the same first wall are arranged along the second direction, and the small surfaces of the multiple battery cells can be oppositely arranged in the second direction.

[0016] The multiple battery cells bonded to the same body part can be called the first battery cell group, and multiple body parts are arranged in the first direction. Therefore, multiple first battery cell groups can be arranged in the first direction. Thus, the multiple battery cells in the battery can form a multi-row and multi-column arrangement structure.

[0017] According to some embodiments of the present application, along the first direction, there is a first gap between two adjacent battery cells; along the third direction, the projection of the buffer part at least partially overlaps with the first gap, the third direction is parallel to the thickness direction of the first wall, and the third direction is perpendicular to the first direction.

[0018] In the above solution, when two adjacent battery cells expand, the size of the first gap between the two adjacent battery cells in the first direction decreases, and the buffer part can be compressed, so that the body part can move as the first wall bonded to the battery cell moves.

[0019] According to some embodiments of the present application, the body part is a flat plate structure, and the buffer part is a bent structure.

[0020] In the above solution, the bent part may include a convex part protruding from one side or the other side in the third direction. The convex part may be one or more, and the orientations of multiple convex parts may be different.

[0021] According to some embodiments of the present application, along the first direction, the dimension of the buffer part after being straightened is L; along the first direction, the distance between two adjacent body parts is L1, and the dimension of the battery cell is T, satisfying: (L - L1) = (1% - 8%)T.

[0022] In the above solution, on the one hand, the buffer part has sufficient buffering capacity (the ability to stretch or contract) to adapt to the expansion amount of the battery cell, and on the other hand, the buffer part will not cause the processing difficulty or processing cost of the buffer part to increase due to excessive buffering capacity.

[0023] According to some embodiments of the present application, the outer shell includes a housing and an end cover. The housing has an opening, and the end cover is connected to the housing to seal the opening. The first wall is the end cover.

[0024] According to some embodiments of the present application, the battery further includes an insulating film. The insulating film covers the outer surface of the housing. One end of the insulating film close to the end cover is formed into a flanging part, and the flanging part is arranged between the insulating sheet and the end cover.

[0025] In the above solution, the insulating sheet presses a part of the insulating film on the outer surface of the end cover, so that the insulating sheet and the insulating film can cover the outer surface of the outer shell to perform insulation isolation on the outer shell.

[0026] According to some embodiments of the present application, the insulating sheet is provided with a sampling wire harness.

[0027] In the above solution, the insulating sheet can have the function of a wire harness isolation plate, and even in the embodiments of the present application, the wire harness isolation plate can be cancelled.

[0028] According to some embodiments of the present application, an electrode terminal is provided on the first wall, and a first hole for avoiding the electrode terminal is provided on the insulating sheet.

[0029] In the above solution, the electrode terminal can pass through the first hole, so as to facilitate electrical connection with the bus bar.

[0030] According to some embodiments of the present application, a pressure relief mechanism is provided on the first wall, and a second hole is provided on the insulating sheet. Along the thickness direction of the first wall, the second hole is disposed opposite to the pressure relief mechanism.

[0031] In the above solution, after the internal pressure of the battery cell reaches the preset value, the gas discharged from the pressure relief mechanism will not be blocked by the insulating sheet, so that the high-pressure gas in the battery cell can be quickly discharged.

[0032] In a second aspect, an embodiment of the present application provides an electrical device, including the battery of the above embodiment, and the battery is used to provide electrical energy.

[0033] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0035] Figure 1 Schematic diagram of a vehicle provided by an embodiment of the present application;

[0036] Figure 2 Explosion view of a battery provided by an embodiment of the present application;

[0037] Figure 3 Explosion view of a battery cell provided by an embodiment of the present application;

[0038] Figure 4 Schematic diagram of a battery provided by another embodiment of the present application;

[0039] Figure 5 Top view of a battery provided by another embodiment of the present application;

[0040] Figure 6 is Figure 5 Cross-sectional view along the A-A direction;

[0041] Figure 7 is Figure 6 Partial enlarged view of the circled B.

[0042] Icons: Vehicle 1000, Battery 100, Controller 200, Motor 300, Box 10, Battery Cell 20, First Sub-Box 11, Second Sub-Box 12, Outer Shell 21, Housing 211, First Wall 212, Electrode Assembly 22, Electrode Terminal 25, Insulating Sheet 26, Body Portion 261, Buffer Portion 262, First Buffer Unit 262a, Second Buffer Unit 262b, Pressure Relief Mechanism 27, First Hole 101, Second Hole 102, First Gap 105. Detailed Embodiments

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above accompanying drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0045] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase may not necessarily refer to the same embodiment when it appears in various positions in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0046] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "attached to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In this application, "a plurality of" means two or more (including two). Similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of sheets" means two or more sheets (including two sheets).

[0049] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0050] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0051] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0052] 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.

[0053] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging and can be used continuously.

[0054] The battery cell can be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0055] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0056] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating substances such as the electrode assembly and the electrolyte. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0057] In some embodiments, at least one electrode terminal is provided on the outer shell, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cover or on the housing.

[0058] In some embodiments, a pressure relief mechanism is provided on the outer shell. The pressure relief mechanism is used to relieve the internal pressure of the battery cell.

[0059] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in the embodiments of the present application.

[0060] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0061] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0062] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0063] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0064] 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.

[0065] The battery has outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient, and is an important part of the development of new energy today.

[0066] The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as energy density, discharge capacity, charge and discharge rate, etc. In addition, the assembly efficiency of the battery also needs to be considered.

[0067] The battery cell disclosed in the embodiments of the present application can be but is not limited to being used in electrical equipment such as vehicles, ships or aircraft. The power system of the electrical equipment can be composed of the battery cell and battery disclosed in the present application.

[0068] The embodiments of the present application provide an electrical device using a battery cell as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0069] For the convenience of description, the following embodiments will take a vehicle 1000, which is an electrical device in an embodiment of the present application, as an example for description.

[0070] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the vehicle provided in the first embodiment of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, or the like. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as the working power requirements for starting, navigating, and running the vehicle 1000.

[0071] The vehicle 1000 may further 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, it is used for the working power requirements for starting, navigating, and driving the vehicle 1000.

[0072] In some embodiments of the present application, the battery 100 may not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] Please refer to Figure 2 , Figure 2Explosion diagram of the battery provided by the first embodiment of the present application. The battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first sub-box body 11 and a second sub-box body 12. The first sub-box body 11 and the second sub-box body 12 cover each other, and the first sub-box body 11 and the second sub-box body 12 jointly define an accommodation space for accommodating the battery cells 20. The second sub-box body 12 may be a hollow structure with one end open, and the first sub-box body 11 may be a plate-like structure. The first sub-box body 11 covers the open side of the second sub-box body 12 so that the first sub-box body 11 and the second sub-box body 12 jointly define an accommodation space; the first sub-box body 11 and the second sub-box body 12 may also both be hollow structures with one side open, and the open side of the first sub-box body 11 covers the open side of the second sub-box body 12.

[0074] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be that multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 10. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing electrical connection among the multiple battery cells 20.

[0075] Among them, the battery cell 20 can be a secondary battery or a primary battery; the battery cell 20 can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0076] Please refer to Figure 3 , Figure 3 Explosion diagram of the battery cell provided by some embodiments of the present application. As Figure 3 shown, the battery cell 20 includes a housing 21, an electrode assembly 22, and an electrode terminal 25. The housing 21 includes a shell 211 and an end cap (i.e., the first wall 212). The shell 211 has an opening, and the end cap closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0077] The housing 211 is a component for cooperating with the end cap to form the internal environment of the battery cell 20, where the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte, and other components. The housing 211 and the end cap can be separate components. The housing 211 can be of various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0078] The end cap refers to a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap can be adapted to the shape of the housing 211 to cooperate with the housing 211. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used to electrically connect with the electrode assembly 22 for outputting or inputting the electrical energy of the battery cell 20. The material of the end cap can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap, and the insulating structure can be used to isolate the electrical connection components in the housing 211 from the end cap to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0079] The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The housing 211 can contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and generally, a separator is provided between the positive electrode plate and the negative electrode plate to separate the positive electrode plate and the negative electrode plate to avoid internal short circuit between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active substances constitute the main body part of the electrode assembly, and the parts of the positive electrode plate and the negative electrode plate without active substances respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body part together or at both ends of the main body part respectively. During the charging and discharging process of the battery, the positive active substance and the negative active substance react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0080] In the related art, the battery cell includes a housing, and the housing generally includes a housing and an end cap. In order to insulate the end cap from an external bus bar or other electrical components, a top patch is usually attached to the outer surface of the end cap.

[0081] The battery may include a plurality of battery cells, and a top patch is attached to the outer surface of the end cap of each battery cell. Therefore, in the production process of the battery, the step of attaching the top patch to the outer surface of the end cap of each battery cell is indispensable. As a result, there are many processing steps for the battery, which affects the production rhythm of the battery and reduces the production efficiency of the battery.

[0082] For this reason, the present application proposes a battery and an electrical device using the same, and the production efficiency of the battery can be improved.

[0083] The battery 100 according to an embodiment of the present application may include a plurality of battery cells 20 and at least one insulating sheet 26.

[0084] As Figure 4 and Figure 5 shown, the plurality of battery cells 20 may be arranged in a certain specific direction to form a battery cell group.

[0085] The plurality of battery cells 20 may be stacked together. For example, the battery cell 20 has a flat structure, and the plurality of battery cells 20 may be stacked along the thickness direction of the battery cell 20.

[0086] The plurality of battery cells 20 may be formed into a whole by a binding member such as a cable tie, that is, a battery cell group.

[0087] The battery cell 20 may include a housing 21, and the housing 21 may define an accommodation space, and an electrode assembly, an electrolyte, etc. may be encapsulated in the accommodation space defined by the housing 21.

[0088] The housing 211 may be a metal housing, a plastic housing, a composite metal housing, or the like.

[0089] The housing 21 may have a first wall 212. It should be noted that the first wall 212 may be any one of the walls of the housing 21. For example, the first wall 212 may be the top wall or the bottom wall of the housing 21. Of course, the first wall 212 may also be the peripheral wall of the housing 21 or any one of the peripheral walls.

[0090] In some embodiments, the housing 21 may include an end cap and a housing 211. The housing 211 is provided with an opening, and the end cap is fixedly connected to the housing 211 and is used to close the opening. Thus, the end cap and the housing 211 form a closed space for accommodating the electrode assembly, the electrolyte, and other substances.

[0091] The housing 211 may be provided with one or more openings. Correspondingly, the end cap may also be one or more.

[0092] The first wall 212 in the embodiment of the present application may be the above-mentioned end cap. Of course, the first wall 212 may also be a wall portion of the housing 211. For example, it may be a wall portion of the housing 211 opposite to the end cap.

[0093] The insulating sheet 26 can be bonded to the outer surface of the first wall 212 of the battery cell 20, whereby the first wall 212 can be insulated from external devices.

[0094] Each insulating sheet 26 is bonded to the outer surface of the first wall 212 of a plurality of battery cells 20.

[0095] That is to say, different from the prior art in which an insulating sheet is bonded to the outer surface of the first wall of a single battery cell, in the embodiment of the present application, an insulating sheet 26 is bonded to the outer surface of the first walls 212 of a plurality of battery cells 20.

[0096] Thus, there is no need to repeatedly perform the step of bonding the insulating sheet 26 to the outer surface of the first wall 212 of each battery cell 20. In the embodiment of the present application, only one process is required to bond an insulating sheet 26 to the outer surfaces of the first walls 212 of a plurality of battery cells 20. During the production process of the battery, a large number of processes are saved, thereby greatly improving the production efficiency of the battery.

[0097] It can be understood that the above-mentioned insulating sheet 26 can be an integrally formed part, or of course, it can also be formed by connecting a plurality of parts together, as long as it is ensured that the insulating sheet 26 is a single integral structure when bonded to the outer surfaces of the first walls 212 of a plurality of battery cells 20.

[0098] For the battery according to the embodiment of the present application, each insulating sheet 26 is bonded to the outer surface of a plurality of first battery cells 20, so only one process is required to bond an insulating sheet 26 to the outer surfaces of the first walls 212 of a plurality of battery cells 20. During the production process of the battery, a large number of processes are saved, thereby greatly improving the production efficiency of the battery.

[0099] In some embodiments of the present application, the insulating sheet 26 is of an integral structure.

[0100] The insulating sheet 26 can be injection-molded. The insulating sheet 26 can be made of an insulating material such as plastic or rubber, and the present application does not make any limitations in this regard.

[0101] The insulating sheet 26 in the present application is of an integral structure, so the production efficiency of the insulating sheet 26 can be improved.

[0102] In some embodiments of the present application, as Figures 4 - 7 shown, the insulating sheet 26 includes a body portion 261 and a buffer portion 262.

[0103] The body portion 261 can be configured as a plate-like structure. There are a plurality of body portions 261, and the plurality of body portions 261 are arranged along the first direction X, and each body portion 261 is bonded to at least one battery cell 20.

[0104] For example, a main body portion 261 can be adhesively bonded only to the outer surface of the first wall 212 of a single battery cell 20; alternatively, a main body portion 261 can be adhesively bonded to the outer surfaces of a plurality of battery cells 20. The plurality of battery cells 20 adhesively bonded by the same main body portion 261 can be arranged in the first direction X, or can be arranged in a direction intersecting the first direction X. The arrangement direction of the plurality of battery cells 20 can be the same as the thickness direction of the battery cell 20, or the arrangement direction of the plurality of battery cells 20 can be perpendicular to the thickness direction of the battery cell 20. The present application does not make any limitation thereto.

[0105] Two adjacent main body portions 261 are connected by a buffer portion 262. The buffer portion 262 can absorb a part of the energy when relative movement occurs between the two adjacent main body portions 261. Since each main body portion 261 is adhesively bonded to at least one battery cell 20, when relative displacement occurs between the plurality of battery cells 20 adhesively bonded by the two adjacent main body portions 261 along the first direction X, the buffer portion 262 can absorb a part of the energy and mitigate the phenomenon that the two adjacent battery cells 20 are squeezed against each other or even the battery cell 20 is damaged.

[0106] The buffer portion 262 can have the effects of buffering and energy absorption due to its own structure, or can have the effects of buffering and energy absorption because of its own material.

[0107] In some embodiments of the present application, as Figures 4 - 5 shown, the housing 21 has a second wall 211a perpendicular to the first direction X, and the second wall 211a is the wall with the largest area of the housing 21.

[0108] The housing 21 can be a flat structure. The areas of the two side walls of the housing 21 opposite to each other in the thickness direction are the largest, that is, the second wall 211a is the two side walls of the housing 21 opposite to each other in the thickness direction, and the first direction X is the thickness direction of the housing 21.

[0109] Some (at least two) of the plurality of battery cells 20 adhesively bonded by the two adjacent main body portions 261 can be arranged in the first direction X, and the first direction X is the thickness direction of the battery cell 20. When the battery cell 20 expands due to normal use or thermal runaway, the expansion direction is mainly the thickness direction of the battery cell 20 (i.e., the first direction X). The buffer portion 262 is arranged between the two adjacent main body portions 261 in the first direction X, and the buffer portion 262 can play a buffering role and mitigate the phenomenon that the two adjacent battery cells 20 are squeezed against each other or even the battery cell 20 is damaged in the first direction X.

[0110] According to some embodiments of the present application, each body portion 261 is bonded to a plurality of battery cells 20. The plurality of battery cells 20 bonded to the same body portion 261 are arranged along the second direction Y, and the first direction X and the second direction Y are perpendicular to each other.

[0111] That is to say, in the first direction X, the size of the body portion 261 can satisfy bonding to the first wall 212 of one battery cell 20, and in the second direction Y, the size of the body portion 261 can satisfy bonding to the first walls 212 of a plurality of battery cells 20.

[0112] The plurality of battery cells 20 bonded to the same first wall 212 are arranged along the second direction Y, and the small faces of the plurality of battery cells 20 can be oppositely arranged in the second direction Y.

[0113] The plurality of battery cells 20 bonded to the same body portion 261 can be referred to as the first battery cell group, and the plurality of body portions 261 are arranged in the first direction X. Therefore, the plurality of first battery cell groups can be arranged in the first direction X. Thus, the plurality of battery cells 20 in the battery can form a multi-row and multi-column arrangement structure.

[0114] In some embodiments of the present application, as Figure 7 shown, along the first direction X, there is a first gap 105 between two adjacent battery cells 20. That is to say, two adjacent battery cells 20 are not in close contact. Thus, when the battery cells 20 are in normal use or expand during thermal runaway, there is a space for the battery cells 20 to expand between two adjacent battery cells 20.

[0115] Along the third direction Z, the projection of the buffer portion 262 at least partially overlaps with the first gap 105. The third direction Z is parallel to the thickness direction of the first wall 212, and the third direction Z is perpendicular to the first direction X.

[0116] Thus, when two adjacent battery cells 20 expand, the size of the first gap 105 between two adjacent battery cells 20 in the first direction X decreases, and the buffer portion 262 can be compressed. Therefore, the body portion 261 can move as it moves along with the first wall 212 bonded to the battery cell 20.

[0117] According to some embodiments of the present application, as Figure 7 shown, the body portion 261 is a flat plate structure, and the buffer portion 262 is a bent structure.

[0118] It can be understood that the bent portion may include a convex portion protruding from one side or the other side along the third direction Z. The convex portion can be one or more, and the orientations of the plurality of convex portions can be different.

[0119] In some embodiments of the present application, the buffer portion 262 may include a first buffer unit 262a, and the first buffer unit 262a protrudes from one side of the body portion 261 toward the third direction Z.

[0120] For example, when the first wall 212 is the top wall of the battery cell 20, the third direction Z is the up-down direction, and the first buffer unit 262a may protrude upward.

[0121] The buffer portion 262 may further include a second buffer unit 262b, and the second buffer unit 262b protrudes from the other side of the body portion 261 toward the third direction Z.

[0122] For example, when the first wall 212 is the top wall of the battery cell 20, the third direction Z is the up-down direction, and the second buffer unit 262b may protrude downward.

[0123] It can be understood that the first buffer unit 262a and the second buffer unit 262b may be formed by bending the same plate portion, and the thickness of the first buffer unit 262a and the thickness of the second buffer unit 262b may be the same.

[0124] Both the first buffer unit 262a and / or the second buffer unit 262b are multiple, and along the first direction X, the first buffer unit 262a and the second buffer unit 262b are alternately arranged in sequence.

[0125] In some embodiments of the present application, along the first direction X, the dimension of the buffer portion 262 after being straightened is L. That is to say, after the buffer portion 262 is straightened, it is no longer a bent structure protruding from the body portion 261, but a plate-like structure like the body portion 261. At this time, the buffer portion 262 will no longer be stretched in the first direction X.

[0126] Along the first direction X, the distance between two adjacent body portions 261 is L1, and the dimension of the battery cell 20 is T, satisfying: (L - L1) = (1% - 8%)T.

[0127] It should be noted that the distance L1 between two adjacent body portions 261 is the distance between two adjacent body portions 261 when the plurality of battery cells 20 do not expand, and the dimension T of the battery cell 20 is the dimension in the first direction X when the battery does not expand.

[0128] The difference value of (L - L1) represents the buffering capacity of the buffer portion 262, and this buffering capacity is positively correlated with the initial dimension of the battery cell 20 in the first direction X.

[0129] The larger the initial size of the battery cell 20 in the first direction X, the larger the size of the battery cell 20 expands during normal use or thermal runaway. Therefore, it is more necessary for the buffer portion 262 to have a greater buffering capacity; the smaller the initial size of the battery cell 20 in the first direction X, the smaller the size of the battery cell 20 expands during normal use or thermal runaway. Therefore, the buffering capacity of the buffer portion 262 can be appropriately reduced.

[0130] (L - L1) can be 1% T, 1.5% T, 2% T, 2.5% T, 3% T, 3.5% T, 4% T, 4.5% T, 5% T, 5.5% T, 6% T, 6.5% T, 7% T, 7.5% T, 8% T.

[0131] The specific values of the above (L - L1) are only some specific examples of this application. Any (L - L1) difference falling within the above range is within the protection scope of this application.

[0132] Since (L - L1) of this application satisfies the above range, on the one hand, the buffer portion 262 has sufficient buffering capacity (the ability to stretch or contract) to adapt to the expansion amount of the battery cell 20, and on the other hand, the buffer portion 262 will not cause the processing difficulty of the buffer portion 262 to increase or the processing cost to increase due to excessive buffering capacity.

[0133] In some embodiments of this application, the outer shell 21 may include an end cap and a housing 211. The housing 211 has an opening, and the end cap is connected to the housing 211 to seal the opening. Thus, the end cap and the housing 211 form a closed space for accommodating substances such as the electrode assembly and the electrolyte.

[0134] The housing 211 may be provided with one or more openings. Correspondingly, the end cap may also be one or more.

[0135] The first wall 212 in the embodiments of this application may be the above-mentioned end cap.

[0136] Of course, the first wall 212 may also be a wall portion of the housing 211. For example, it may be the wall portion of the housing 211 opposite to the end cap.

[0137] In some embodiments, the end cap may be located at the top of the battery cell 20. Thus, the end cap may be the top cover sheet of the battery cell 20.

[0138] The battery cell 20 may include an electrode terminal 25, and the electrode terminal 25 may be installed on the end cap.

[0139] According to some embodiments of this application, the battery further includes an insulating film (not shown). The insulating film covers the outer surface of the housing 211, and the insulating film can insulate and isolate the housing 211 from the external devices.

[0140] One end of the insulating film close to the end cap is formed into a flanging portion, and the flanging portion is arranged between the insulating sheet 26 and the end cap. Thus, a part of the insulating film is pressed against the outer surface of the end cap by the insulating sheet 26, so that the insulating sheet 26 and the insulating film can wrap the outer surface of the housing 21 to insulate the housing 21.

[0141] In some embodiments of the present application, a sampling wire harness is provided on the insulating sheet 26. That is to say, the insulating sheet 26 can function as a wire harness isolation plate, and even in the embodiments of the present application, the wire harness isolation plate can be cancelled.

[0142] The insulating sheet 26 can be used for the installation and fixation of the sampling wire harness, and of course can also be used for the installation and positioning of the bus bar.

[0143] In some embodiments of the present application, an electrode terminal 25 is provided on the first wall 212, and a first hole 101 for avoiding the electrode terminal 25 is provided on the insulating sheet 26.

[0144] The electrode terminal 25 can be electrically connected to the electrode assembly inside the housing 21 through an adapter, and the electrode terminal 25 can pass through the first wall 212.

[0145] The insulating sheet 26 is provided with a first hole 101, so that the electrode terminal 25 can pass through the first hole 101, which is convenient for electrical connection with the bus bar.

[0146] According to some embodiments of the present application, a pressure relief mechanism 27 is provided on the first wall 212, and a second hole 102 is provided on the insulating sheet 26. Along the thickness direction of the first wall 212, the second hole 102 is disposed opposite to the pressure relief mechanism 27.

[0147] Thus, after the internal pressure of the battery cell 20 reaches a preset value, the gas discharged from the pressure relief mechanism 27 will not be blocked by the insulating sheet 26, so that the high-pressure gas in the battery cell 20 can be quickly discharged.

[0148] The electrical equipment of the embodiments of the present application will be briefly described below.

[0149] The electrical equipment according to the embodiments of the present application includes the above-mentioned battery. Since the electrical equipment according to the embodiments of the present application is provided with the above-mentioned battery, the production efficiency of the battery is improved.

[0150] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. 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, characterized in that: include: a plurality of battery cells, the battery cells comprising a housing having a first wall; at least one insulating sheet, each of the insulating sheets being bonded to the outer surface of the first wall of the plurality of battery cells; The insulating sheet includes a main body and a buffer part. There are a plurality of main bodies arranged along a first direction. Two adjacent main bodies are connected by the buffer part. Each main body is bonded to at least one battery cell.

2. The battery according to claim 1, characterized in that The insulating sheet is an integral structure.

3. The battery according to claim 1, characterized in that The housing has a second wall perpendicular to the first direction, and the second wall is a wall of the housing with the largest area.

4. The battery according to claim 3, characterized in that Each of the main body parts is bonded to a plurality of the battery cells, and the plurality of battery cells bonded to the same main body part are arranged along a second direction, and the first direction is perpendicular to the second direction.

5. The battery according to any one of claims 1 to 4, characterized in that Along the first direction, there is a first gap between two adjacent battery cells; Along a third direction, a projection of the buffer portion at least partially overlaps with the first gap, the third direction is parallel to a thickness direction of the first wall, and the third direction is perpendicular to the first direction.

6. The battery according to claim 1, characterized in that The main body is a flat plate structure, and the buffer portion is a bent structure.

7. The battery according to claim 1, characterized in that Along the first direction, the dimension of the buffer portion after being straightened is L; Along the first direction, the distance between two adjacent main body parts is L1, and the size of the battery cell is T, which satisfies: (L-L1)=(1%-8%)T.

8. The battery according to claim 1, characterized in that The housing comprises a shell and an end cover, the shell has an opening, the end cover is connected to the shell to seal the opening, and the first wall is the end cover.

9. The battery according to claim 8, characterized in that The battery further includes an insulating film, the insulating film covers the outer surface of the shell, one end of the insulating film close to the end cover is formed into a flange portion, and the flange portion is arranged between the insulating sheet and the end cover.

10. The battery according to claim 1, characterized in that The insulating sheet is provided with a sampling harness.

11. The battery according to claim 1, characterized in that The first wall is provided with an electrode terminal, and the insulating sheet is provided with a first hole for avoiding the electrode terminal.

12. The battery according to claim 1, characterized in that A pressure relief mechanism is provided on the first wall, and a second hole is provided on the insulating sheet. The second hole is arranged opposite to the pressure relief mechanism along the thickness direction of the first wall.

13. An electrical equipment, characterized in that: A battery comprising any one of claims 1 to 12, wherein the battery is used to provide electrical energy.

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