Battery and electric device

Abstract

Disclosed in the present application are a battery and an electric device. The battery comprises battery cells and a thermal management component. Each battery cell comprises a casing, wherein the casing has a first wall. The thermal management component is in thermal conduction connection with the first wall, and a flow channel for accommodating a heat exchange medium is formed inside the thermal management component; the first wall has a first surface facing the thermal management component, and the thermal management component has a second surface facing the battery cell; the first surface is provided with a first tip discharge portion; and / or the second surface is provided with a second tip discharge portion. The structure can greatly improve the reliability of the battery.

Description

Batteries and electrical equipment

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese patent application (202421187788.7) entitled "Battery and Electrical Device", filed on May 28, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Technology

[0004] With the development of new energy technologies, batteries are being used more and more widely. Batteries have high energy density, high safety, long service life and are environmentally friendly. They have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swapping stations, engineering manufacturing, and intelligent equipment. They also promote the development and research of technologies in communication terminals, medical devices, and energy development.

[0005] In the development of battery technology, improving battery reliability is a technical problem that urgently needs to be solved.

[0006] Summary of the Invention

[0007] This application provides a battery and an electrical device that can effectively improve battery reliability.

[0008] In a first aspect, embodiments of this application provide a battery, the battery including a battery cell and a thermal management component. The battery cell includes a casing, the casing having a first wall; the thermal management component is thermally connected to the first wall, and the interior of the thermal management component forms a flow channel for accommodating a heat exchange medium; wherein, the first wall has a first surface facing the thermal management component, and the thermal management component has a second surface facing the battery cell; the first surface is provided with a first tip discharge portion; and / or, the second surface is provided with a second tip discharge portion.

[0009] In the above technical solution, by setting a first tip discharge section and / or a second tip discharge section, when the battery cell experiences thermal runaway, the first tip discharge section and / or the second tip discharge section accumulate charges to generate a tip discharge phenomenon, thereby damaging the thermal management component. The heat exchange medium in the thermal management component is released to the vicinity of the thermally runaway battery cell, mitigating secondary hazards and improving battery reliability.

[0010] In some embodiments, the first tip discharge portion is a protrusion or a recess; and / or, the second tip discharge portion is a protrusion or a recess.

[0011] In the above technical solution, having a protrusion or a recess in the first tip discharge portion reduces the fabrication difficulty of the first tip discharge portion. Similarly, having a protrusion or a recess in the second tip discharge portion reduces the fabrication difficulty of the second tip discharge portion.

[0012] In some embodiments, one of the first tip discharge portion and the second tip discharge portion is a protrusion and the other is a recess, with at least a portion of the protrusion accommodated in the recess.

[0013] In the above technical solution, the protrusions and grooves work together to restrict the movement of the battery cells relative to the thermal management components, thus achieving a positioning effect.

[0014] In some embodiments, a plurality of first tip discharge portions are provided, and the plurality of first tip discharge portions are spaced apart; and / or, a plurality of second tip discharge portions are provided, and the plurality of second tip discharge portions are spaced apart.

[0015] In the above technical solution, multiple first tip discharge sections and / or multiple second tip discharge sections make it easier for the thermal management components to be damaged and release the heat exchange medium in time when the battery cell is thermally runaway.

[0016] In some embodiments, the first tip discharge portion is integrally formed with the first wall.

[0017] In the above technical solution, the first tip discharge part and the first wall are integrally formed, which reduces the difficulty of manufacturing the first wall and has high production efficiency.

[0018] In some embodiments, the thermal management component includes a first plate and a second plate stacked together. The surface of the second plate facing the first plate is provided with a groove. The first plate covers the groove to form the flow channel. The surface of the first plate facing away from the second plate is the second surface. The second tip discharge portion is integrally formed with the first plate.

[0019] In the above technical solution, the integral molding of the second tip discharge part with the first plate reduces the difficulty of manufacturing the first plate and the production efficiency of the first plate is high.

[0020] In some embodiments, along a direction perpendicular to the first surface, the projection of the first tip discharge portion at least partially overlaps with the projection of the flow channel; and / or,

[0021] Along a direction perpendicular to the second surface, the projection of the second tip discharge portion at least partially overlaps with the projection of the flow channel.

[0022] In the above technical solution, along the direction perpendicular to the first surface, the projection of the first tip discharge part overlaps at least partially with the projection of the flow channel. When the battery cell experiences thermal runaway, the area of ​​the thermal management component near the flow channel is more easily damaged, thereby releasing the heat exchange medium in a timely manner.

[0023] Along the direction perpendicular to the second surface, the projection of the second tip discharge section at least partially overlaps with the projection of the flow channel. When the battery cell experiences thermal runaway, the area of ​​the thermal management component near the flow channel is more likely to be damaged, thereby releasing the heat exchange medium in a timely manner.

[0024] In some embodiments, the battery further includes an adhesive layer, at least a portion of which is disposed between the first surface and the second surface.

[0025] In the above technical solution, the addition of an adhesive layer can improve the connection stability between the battery cell and the thermal management component.

[0026] In some embodiments, the housing includes a shell and an end cap. The shell includes a bottom wall and a side wall. The side wall surrounds the bottom wall. One end of the side wall is connected to the bottom wall, and the other end forms an opening. The end cap closes to the opening. The bottom wall is the first wall.

[0027] In the above technical solution, the first tip discharge section is located on the bottom wall, which can reduce the impact on the structure of the battery cell in other directions.

[0028] Secondly, embodiments of this application provide an electrical device, which includes the battery provided in the first aspect embodiment, the battery being used to supply power to the electrical device. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0031] Figure 2 is an exploded view of a battery according to some embodiments of this application;

[0032] Figure 3 is an exploded view of a battery cell according to some embodiments of this application;

[0033] Figure 4 is a schematic diagram of the battery structure of some embodiments of this application;

[0034] Figure 5 is a cross-sectional view of a battery according to some embodiments of this application;

[0035] Figure 6 is an enlarged view of part C in Figure 5;

[0036] Figure 7 is a cross-sectional view of a battery according to some other embodiments of this application;

[0037] Figure 8 is a cross-sectional view of a battery according to some embodiments of this application;

[0038] Figure 9 is a cross-sectional view of a battery according to some embodiments of this application;

[0039] Figure 10 is a cross-sectional view of a battery according to some further embodiments of this application;

[0040] Figure 11 is an enlarged view of part D in Figure 10;

[0041] Figure 12 is a cross-sectional view of a battery according to some other embodiments of this application.

[0042] Icons: 100-Battery; 10-Battery cell; 11-Casing; 111-End cap; 112-Housing; 1121-Bottom wall; a-First tip discharge section; 1122-Side wall; 1123-Opening; 113-First wall; 1131-First surface; 12-Electrode assembly; 13-Electrode terminal; 14-Pressure relief mechanism; 20-Box; 21-First part; 22-Second part; 23-Accommodation space; 30-Thermal management component; 31-First plate; 311-Second surface; b-Second tip discharge section; 32-Second plate; 321-Groove; 33-Flow channel; 40-Adhesive layer; 1000-Vehicle; 200-Motor; 300-Controller;

[0043] The accompanying drawings are not drawn to scale. Detailed Implementation

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

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

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

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

[0048] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0051] In this application, "multiple" means two or more (including two).

[0052] In this application, the battery cell may include, but is not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The battery cell may be cylindrical, flat, cuboid, or other shapes. Battery cells are generally classified by their packaging method, including cylindrical battery cells and prismatic battery cells.

[0053] A single battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes; metal ions (such as lithium ions) repeatedly insert and extract between the two electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0054] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab.

[0055] Taking lithium-ion batteries as an example, the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming metal materials (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer. The negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab.

[0057] The negative electrode current collector can be a metal foil or a composite current collector. For example, the metal foil can be made of silver-plated aluminum, silver-plated stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium. The negative electrode active material can be carbon or silicon, etc.

[0058] To prevent melting when carrying large currents, multiple positive electrode tabs and multiple negative electrode tabs are stacked together. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure.

[0059] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing can reduce the impact of liquids or other foreign matter on the charging or discharging of the battery cells.

[0060] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0061] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0062] In some embodiments, multiple battery cells can first be integrated into at least one battery module, and then the battery module can be installed in a housing to form a battery pack. In this embodiment, auxiliary structural components such as crossbeams can also be provided between the battery modules to improve the installation stability of the battery modules in the housing.

[0063] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0064] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0065] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0066] Thermal runaway in battery cells typically occurs in rechargeable batteries such as lithium-ion batteries. It refers to a rapid rise in temperature inside a battery cell due to uncontrolled chemical reactions, which may be accompanied by gas production and expansion of the battery casing, and may even lead to a series of secondary hazards such as fire or explosion.

[0067] The battery cells that have thermal runaway are damaged and cannot be used anymore. How to reduce the secondary hazards caused by thermal runaway of battery cells has become a difficult problem.

[0068] In view of this, in order to solve the problem of secondary hazards caused by thermal runaway of battery cells, this application provides a battery including battery cells and a thermal management component, wherein the thermal management component is used to regulate the temperature of the battery cells. By providing a tip discharge section in at least one of the battery cells and the thermal management component, when the battery cell experiences thermal runaway, the tip discharge section accumulates charges to generate a tip discharge phenomenon, which damages the thermal management component. The heat exchange medium within the thermal management component is released to the vicinity of the thermally runaway battery cell, reducing the secondary hazards caused by the thermally runaway battery cell and improving battery reliability.

[0069] The technical solutions disclosed in this application are applicable to, but not limited to, batteries and electrical devices that use batteries.

[0070] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0071] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0072] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 according to some embodiments of this application. A battery 100 is disposed inside the vehicle 1000, and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000.

[0073] The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery 100 to supply power to the motor 200, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0074] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] In some embodiments, please refer to FIG2, which is an exploded schematic diagram of a battery 100 according to some embodiments of the present application. The battery 100 includes a plurality of battery cells 10. The plurality of battery cells 10 can be connected in series, in parallel, or in a mixed manner. Among them, a mixed manner means that the plurality of battery cells 10 are connected in both series and parallel.

[0076] In some embodiments, the battery 100 may also include a busbar (not shown), through which multiple battery cells 10 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 10.

[0077] Busbar components can be metallic conductors, such as copper, iron, aluminum, steel, aluminum alloys, etc.

[0078] In some embodiments, the battery 100 may further include a housing 20 for accommodating the battery cell 10. The housing 20 may include a first portion 21 and a second portion 22, which overlap each other to define a receiving space 23 for accommodating the battery cell 10. The connection between the first portion 21 and the second portion 22 may be sealed using a sealing element (not shown), such as a sealing ring, sealant, etc.

[0079] The first part 21 and the second part 22 can be of various shapes, such as cuboids or cylinders. The first part 21 can be a hollow structure with one open side, and the second part 22 can also be a hollow structure with one open side. The open side of the second part 22 covers the open side of the first part 21, thus forming a box 20 with a receiving space 23. Alternatively, the first part 21 can be a hollow structure with one open side, and the second part 22 can be a plate-like structure. The second part 22 covers the open side of the first part 21, thus forming a box 20 with a receiving space 23.

[0080] In some embodiments, the battery 100 may further include a thermal management component 30, which contains a heat exchange medium to regulate the temperature of the plurality of battery cells 10. The heat exchange medium is a fluid, which can be a liquid or a gas. Temperature regulation refers to heating or cooling the plurality of battery cells 10. When cooling or lowering the temperature of the battery cells 10, the thermal management component 30 contains a cooling fluid to lower the temperature of the plurality of battery cells 10. In this case, the thermal management component 30 may also be referred to as a cooling component, a cooling system, or a cooling plate, etc., and the heat exchange medium it contains may also be referred to as a cooling medium or a cooling fluid, more specifically, a coolant or a cooling gas. Alternatively, the thermal management component 30 may also be used to heat the plurality of battery cells 10 to raise their temperature. Optionally, the fluid may be circulating to achieve a better temperature regulation effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, or air, etc.

[0081] Please refer to Figure 3, which is an exploded view of a battery cell 10 according to some embodiments of this application. The battery cell 10 may include a housing 112, an electrode assembly 12, an end cap 111, an electrode terminal 13, and other functional components.

[0082] The housing 112 is a component used to house the electrode assembly 12. The housing 112 can be a hollow structure with an opening 1123 at one end, or it can be a hollow structure with openings 1123 at both ends. The housing 112 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The housing 112 can have various shapes, such as a cylinder or a cuboid. For example, in Figure 3, the housing 112 is a cuboid.

[0083] End cap 111 is a component that closes onto the opening 1123 of housing 112 to isolate the internal environment of battery cell 10 from the external environment. End cap 111 closes onto the opening 1123 of housing 112, and end cap 111 and housing 112 together define a sealed space for accommodating electrode assembly 12, electrolyte, and other functional components. The shape of end cap 111 can be adapted to the shape of housing 112. For example, if housing 112 is a cuboid structure, end cap 111 can be a rectangular plate structure adapted to housing 112; or if housing 112 is a cylindrical structure, end cap 111 can be a circular plate structure adapted to housing 112. The material of end cap 111 can also be various. For example, end cap 111 can be made of metal, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of end cap 111 can be the same as or different from the material of housing 112.

[0084] In the battery cell 10, there can be one or two end caps 111. If the housing 112 is a hollow structure with an opening 1123 at one end, then one end cap 111 is provided accordingly; if the housing 112 is a hollow structure with openings 1123 at both ends, then two end caps 111 are provided accordingly, with the two end caps 111 respectively covering the two openings 1123 of the housing 112. For example, in Figure 3, one end cap 111 is provided.

[0085] Two electrode terminals 13 can be provided, namely a positive terminal and a negative terminal. The electrode terminals 13 can be provided on the end cap 111, and the combination of the electrode terminals 13 and the end cap 111 can be called an end cap assembly.

[0086] In some embodiments, a pressure relief mechanism 14 may also be provided on the end cap 111. The pressure relief mechanism 14 is used to release the pressure inside the battery cell 10 when the pressure or temperature inside the battery cell 10 reaches a threshold. This threshold varies depending on the design requirements. The threshold may depend on one or more of the materials of the electrode, electrolyte, and separator in the battery cell 10. The pressure relief mechanism 14 may take the form of an explosion-proof valve, explosion-proof disc, or pressure relief valve, and may specifically adopt a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 10 reaches a predetermined threshold, the pressure relief mechanism 14 performs an action or a weak structure provided in the pressure relief mechanism 14 is destroyed, thereby forming an opening 1123 or channel for releasing internal pressure.

[0087] The pressure relief mechanism 14 can be disposed on the housing 112 or on the end cover 111. For example, in FIG3, the pressure relief mechanism 14 is disposed on the end cover 111.

[0088] This application provides a battery 100 that can reduce secondary hazards caused by thermal runaway of the battery cell 10 and improve the reliability of the battery 100. The specific structure of the battery 100 is described in detail below with reference to the accompanying drawings.

[0089] Figure 4 is a structural schematic diagram of the battery 100 according to some embodiments of this application; Figure 5 is a cross-sectional view of the battery 100 according to some embodiments of this application; Figure 6 is an enlarged view of part C in Figure 5.

[0090] Referring to Figures 3 to 6, an embodiment of this application provides a battery 100, which includes a battery cell 10 and a thermal management component 30. The battery cell 10 includes a housing 11, which has a first wall 113. The thermal management component 30 is thermally connected to the first wall 113, and a flow channel 33 for accommodating a heat exchange medium is formed inside the thermal management component 30; wherein, the first wall 113 has a first surface 1131 facing the thermal management component 30, and the thermal management component 30 has a second surface 311 facing the battery cell 10.

[0091] In some embodiments, the first surface 1131 is provided with a first tip discharge portion a.

[0092] In some embodiments, the second surface 311 is provided with a second tip discharge portion b.

[0093] The first wall 113 can be any wall of the battery cell 10. In embodiments where the battery cell 10 is a square battery cell 10, the first wall 113 can be a side wall 1122 or a bottom wall 1121 of the outer casing 11. In embodiments where the battery cell 10 is a cylindrical battery cell 10, the first wall 113 can be a peripheral wall of the outer casing 11.

[0094] The thermal management component 30 is thermally connected to the first wall 113, meaning that there is good thermal contact between the thermal management component 30 and the first wall 113, so that heat is transferred between the battery cell 10 and the thermal management component 30, thereby regulating the temperature of the battery cell 10. This contact can be direct or indirect through a thermally conductive material.

[0095] The first tip discharge portion a is a conductive structure disposed on the first wall 113. The first tip discharge portion a is a structure capable of causing charge accumulation in that region, resulting in an electric field strength in the first tip discharge portion a that is much higher than the surrounding area, thus easily inducing tip discharge. The first tip discharge portion a can be fabricated by methods such as machining, 3D printing, and chemical etching. The first tip discharge portion a includes, but is not limited to, structures such as protrusions, depressions, and scratches formed on the first surface 1131. The provision of the first tip discharge portion a enables…

[0096] The second tip discharge portion b is a conductive structure disposed on the thermal management component 30. The second tip discharge portion b is a structure capable of causing charge concentration in that area, resulting in an electric field strength in the second tip discharge portion b that is much higher than the surrounding area, thus easily inducing tip discharge. The second tip discharge portion b can be fabricated by methods such as machining, 3D printing, and chemical etching. The second tip discharge portion b includes, but is not limited to, structures such as protrusions, depressions, and scratches formed on the second surface 311.

[0097] A first tip discharge portion a can be provided on the first surface 1131, and a second tip discharge portion b can be provided on the second surface 311 (as shown in Figures 4, 10, and 12). Alternatively, the first tip discharge portion a can be provided only on the first surface 1131, without the second surface 311 (as shown in Figures 5, 6, and 7). Of course, it is also possible to provide only the second tip discharge portion b on the second surface 311, without the first surface 1131 (as shown in Figures 8 and 9).

[0098] When the battery cell 10 is in normal use, the casing 11 is not charged. The casing 11 is usually covered with an insulating film to reduce the risk of short circuits between the battery cell 10 and other structures. In the event of thermal runaway, the battery cell 10 short-circuits internally, and the casing 11 becomes charged. At high temperatures, the insulating film on the surface of the casing 11 melts, and the thermal management component 30 also becomes charged. This satisfies the requirement that at least one of the first surface 1131 and the second surface 311 has a tip discharge section. Charge accumulates in the area where the tip discharge section is located, generating a tip discharge phenomenon that damages the water-cooled plate and releases the heat exchange medium.

[0099] It is understandable that the heat exchange medium plays a role in heat exchange when the battery cell 10 is in normal use, and a role in fire suppression when the battery cell 10 experiences thermal runaway. To improve the fire suppression effect, the heat exchange medium can be made of non-combustible materials with good electrical insulation properties.

[0100] In this embodiment, by providing a first tip discharge section a, when the battery cell 10 experiences thermal runaway, the first tip discharge section a and / or the second tip discharge section b accumulate charges to generate a tip discharge phenomenon, thereby damaging the thermal management component 30. The heat exchange medium inside the thermal management component 30 is released to the vicinity of the thermal runaway battery cell 10, reducing the secondary hazards caused by the thermal runaway battery cell 10 and improving the reliability of the battery 100.

[0101] By providing a second tip discharge section b, when the battery cell 10 experiences thermal runaway, the second tip discharge section b accumulates charges to generate a tip discharge phenomenon, thereby damaging the thermal management component 30. The heat exchange medium inside the thermal management component 30 is released to the vicinity of the thermal runaway battery cell 10, reducing the secondary hazards caused by the thermal runaway battery cell 10 and improving the reliability of the battery 100.

[0102] Figure 7 is a cross-sectional view of a battery 100 according to other embodiments of this application.

[0103] Referring to Figures 5 and 7, in some embodiments, the first tip discharge portion a is a protrusion or a recess. Having the first tip discharge portion a as a protrusion or a recess reduces the difficulty of fabricating the first tip discharge portion a.

[0104] Figure 8 is a cross-sectional view of a battery 100 according to some other embodiments of the present application; Figure 9 is a cross-sectional view of a battery 100 according to yet another embodiment of the present application.

[0105] Referring to Figures 8 and 9, in some embodiments, the second tip discharge portion b is a protrusion or a recess. Having a protrusion or a recess in the second tip discharge portion b reduces the difficulty of fabricating it.

[0106] It should be understood that both protrusions and recesses can cause charge accumulation, leading to tip discharge. In some other embodiments, the first surface 1131 may also have both protrusions and recesses. The second surface 311 may also have both protrusions and recesses.

[0107] The protrusion can be rounded or sharp, as long as it can accumulate charge and produce a point discharge phenomenon. Optionally, the protrusion is a sharp structure, and the more sharp parts there are, the more charge accumulates. The shape of the protrusion includes, but is not limited to, cones, wedges, cuboids, trapezoids, and irregular shapes.

[0108] The recess can be rounded or have a sharp inner surface, as long as it can induce a point discharge phenomenon. For example, the junction between the sidewall 1122 of the recess and the second surface 311 can be sharp, or the inner surface of the recess can be conical. The shape of the recess includes, but is not limited to, circular grooves, rectangular grooves, conical grooves, and irregularly shaped grooves.

[0109] Figure 10 is a cross-sectional view of a battery 100 according to some other embodiments of the present application; Figure 11 is an enlarged view of part D in Figure 10; Figure 12 is a cross-sectional view of a battery 100 according to some other embodiments of the present application.

[0110] In some embodiments, one of the first tip discharge portion a and the second tip discharge portion b is a protrusion and the other is a recess, with at least a portion of the protrusion being accommodated in the recess.

[0111] For example, as shown in FIG10, the first tip discharge portion a is a protrusion and the second tip discharge portion b is a concave portion.

[0112] For example, as shown in FIG10, the second tip discharge portion b is a protrusion and the first tip discharge portion a is a recess.

[0113] In this embodiment, the protrusion and recess cooperate. On the one hand, the cooperation between the protrusion and recess makes it easier to cause tip discharge, which can damage the thermal management component 30 in time. On the other hand, it can limit the movement of the battery cell 10 relative to the thermal management component 30, thus achieving a positioning effect. Furthermore, the protrusion and recess can share a portion of their dimensions, which helps to reduce the distance between the first surface 1131 and the second surface 311, thereby increasing the energy density of the battery 100.

[0114] In some embodiments, a plurality of first tip discharge portions a are provided, and the plurality of first tip discharge portions a are spaced apart.

[0115] The first tip discharge section a can be set in two, three, four, five, etc.

[0116] In some embodiments, a plurality of second tip discharge portions b are provided, and the plurality of second tip discharge portions b are spaced apart.

[0117] The second tip discharge section b can be configured in two, three, four, five, etc.

[0118] Multiple first tip discharge sections a and / or multiple second tip discharge sections b make it easier for the thermal management component 30 to be damaged and release the heat exchange medium in time when the battery cell 10 experiences thermal runaway.

[0119] In some embodiments, the first tip discharge portion a is integrally formed with the first wall 113. That is, the first tip discharge portion a and the first wall 113 are formed in one step during the same manufacturing process, thereby providing better structural integrity.

[0120] In this embodiment, the first tip discharge part a is integrally formed with the first wall 113, which reduces the difficulty of manufacturing the first wall 113 and makes the production efficiency of the first wall 113 high.

[0121] Optionally, the first wall 113 is formed by stamping. For example, a recess is formed on the inner surface of the first wall 113, and a protrusion is formed on the first surface 1131 corresponding to the position of the recess, to obtain a first tip discharge portion a protruding on the first surface 1131. The inner surface of the first wall 113 is the surface of the first wall 113 facing the interior of the battery cell 10, and the first surface 1131 can be understood as the outer surface of the first wall 113. Alternatively, a recess is formed on the first surface 1131, and a protrusion is formed on the inner surface of the first wall 113 corresponding to the position of the recess, to obtain a first tip discharge portion a recessed on the first surface 1131.

[0122] Referring to FIG11, in some embodiments, the thermal management component 30 includes a first plate 31 and a second plate 32 stacked together. The surface of the second plate 32 facing the first plate 31 is provided with a groove 321. The first plate 31 covers the groove 321 to form a flow channel 33. The surface of the first plate 31 facing away from the second plate 32 is the second surface 311. The second tip discharge part b is integrally formed with the first plate 31.

[0123] That is, the second tip discharge part b and the first plate 31 are formed in the same manufacturing process at the same time, thereby providing better structural integrity.

[0124] The shapes of the first plate 31 and the second plate 32 can be configured as needed. For example, the thermal management component 30 is rectangular, and the first plate 31 and the second plate 32 are constructed as rectangular plates.

[0125] In the above technical solution, the integral molding of the second tip discharge part b with the first plate 31 reduces the manufacturing difficulty of the first plate 31 and the production efficiency of the first plate 31 is high.

[0126] Optionally, the second plate 32 is stamped.

[0127] Optionally, the first plate 31 is stamped. For example, a recess is formed on the side of the first plate 31 facing the second plate 32, and a protrusion is formed on the second surface 311 corresponding to the position of the recess, to obtain a second tip discharge portion b protruding from the second surface 311. Alternatively, a recess is formed on the second surface 311, and a protrusion corresponding to the recess is formed on the side of the first plate 31 facing the second plate 32, to obtain a second tip discharge portion b recessed from the second surface 311.

[0128] Referring to Figures 6 and 11, in some embodiments, the projection of the first tip discharge portion a overlaps at least partially with the projection of the flow channel 33 along a direction perpendicular to the first surface 1131.

[0129] The projection of the first tip discharge section a and the projection of the flow channel 33 may partially overlap. The projection of the first tip discharge section a and the projection of the flow channel 33 may also completely overlap, for example, the projection of the first tip discharge section a falls within the projection of the flow channel 33.

[0130] Along the direction perpendicular to the first surface 1131, the projection of the first tip discharge section a overlaps at least partially with the projection of the flow channel 33. When the battery cell 10 experiences thermal runaway, the area of ​​the thermal management component 30 near the flow channel 33 is more likely to be damaged, thereby releasing the heat exchange medium in a timely manner.

[0131] Referring to FIG11, in some embodiments, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33 along a direction perpendicular to the second surface 311.

[0132] The projection of the second tip discharge portion b and the projection of the flow channel 33 may partially overlap. Alternatively, the projection of the second tip discharge portion b and the projection of the flow channel 33 may completely overlap, for example, the projection of the second tip discharge portion b may fall within the projection of the flow channel 33.

[0133] Along the direction perpendicular to the second surface 311, the projection of the second tip discharge section b at least partially overlaps with the projection of the flow channel 33. When the battery cell 10 experiences thermal runaway, the area of ​​the thermal management component 30 near the flow channel 33 is more likely to be damaged, thereby releasing the heat exchange medium in a timely manner.

[0134] Referring to FIG6, in some embodiments, the battery 100 further includes an adhesive layer 40, at least a portion of which is disposed between the first surface 1131 and the second surface 311.

[0135] The adhesive layer 40 can improve the connection stability between the battery cell 10 and the thermal management component 30.

[0136] Optionally, the adhesive layer 40 is a thermally conductive adhesive, thereby improving the heat transfer efficiency between the battery cell 10 and the thermal management component 30.

[0137] In some embodiments, one of the first surface 1131 and the second surface 311 is provided with a protrusion as a tip discharge portion, while the other is not provided.

[0138] When the first surface 1131 and the second surface 311 are connected by the adhesive layer 40, there is usually an adhesive overflow problem, that is, the adhesive overflows to the edge.

[0139] In this embodiment, by setting a protrusion, the protrusion being the preset thickness of the adhesive layer 40, the overflow of the adhesive layer 40 can be mitigated.

[0140] Referring to FIG3, in some embodiments, the outer casing 11 includes a housing 112 and an end cap 111. The housing 112 includes a bottom wall 1121 and a side wall 1122. The side wall 1122 surrounds the bottom wall 1121. One end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123. The end cap 111 covers the opening 1123. The bottom wall 1121 is a first wall 113.

[0141] In this embodiment, the first tip discharge section a is disposed on the bottom wall 1121, which can reduce the impact on other directions of the battery cell 10.

[0142] This application also provides an electrical device, which includes the battery 100 provided in any of the above embodiments, and the battery 100 is used to supply power to the electrical device.

[0143] Referring to Figures 3, 5, and 6, this application embodiment also provides a battery 100, which includes a battery cell 10, a thermal management component 30, and an adhesive layer 40. The battery cell 10 includes a housing 11, which includes a casing 112 and an end cap 111. The casing 112 includes a bottom wall 1121 and a side wall 1122. The bottom wall 1121 and the side wall 1122 are integrally formed, and the side wall 1122 surrounds the bottom wall 1121. One end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123. The end cap 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. The thermal management component 30 has a flow channel 33 formed inside to accommodate a heat exchange medium, and the thermal management component 30 has a second surface 311 facing the battery cell 10. The first surface 1131 is provided with a first tip discharge portion a, which is a protrusion formed by stamping the bottom wall 1121. The height of the protrusion from the first surface 1131 is between 0.1 mm and 2 mm. Along the direction perpendicular to the first surface 1131, the projection of the first tip discharge portion a at least partially overlaps with the projection of the flow channel 33. The adhesive layer 40 is disposed between the first surface 1131 and the second surface 311.

[0144] Referring to Figures 3 and 8, this embodiment of the application also provides a battery 100, which includes a battery cell 10, a thermal management component 30, and an adhesive layer 40. The battery cell 10 includes a housing 11, which includes a shell 112 and an end cap 111. The shell 112 includes a bottom wall 1121 and a side wall 1122. The bottom wall 1121 and the side wall 1122 are integrally formed, and the side wall 1122 surrounds the bottom wall 1121. One end of the side wall 1122 is connected to the bottom wall 1121, and the other end forms an opening 1123. The end cap 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. The thermal management component 30 has a flow channel 33 formed inside to accommodate a heat exchange medium, and the thermal management component 30 has a second surface 311 facing the battery cell 10. The second surface 311 is provided with a second tip discharge portion b, which is a protrusion formed by stamping of the thermal management component 30. The height of the protrusion from the first surface 1131 is between 0.1 mm and 2 mm. Along the direction perpendicular to the second surface 311, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33. The adhesive layer 40 is disposed between the first surface 1131 and the second surface 311.

[0145] Referring to Figures 3, 10, and 11, this application embodiment also provides a battery 100, which includes a battery cell 10, a thermal management component 30, and an adhesive layer 40. The battery cell 10 includes a housing 11, which includes a casing 112 and an end cap 111. The casing 112 includes a bottom wall 1121 and a side wall 1122, which are integrally formed. The side wall 1122 surrounds the bottom wall 1121, with one end connected to the bottom wall 1121 and the other end forming an opening 1123. The end cap 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. The thermal management component 30 has a flow channel 33 formed inside to accommodate a heat exchange medium, and it has a second surface 311 facing the battery cell 10. A first tip discharge portion a is provided on the first surface 1131. The first tip discharge portion a is a protrusion formed by stamping on the bottom wall 1121. The height of the protrusion protruding from the first surface 1131 is between 0.1 mm and 2 mm. Along the direction perpendicular to the first surface 1131, the projection of the first tip discharge portion a at least partially overlaps with the projection of the flow channel 33. A second tip discharge portion b is provided on the second surface 311. The second tip discharge portion b is a recess formed by stamping on the thermal management component 30. Along the direction perpendicular to the second surface 311, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33. The protrusion is accommodated in the recess.

[0146] Referring to Figures 3, 10, and 12, this application embodiment also provides a battery 100, which includes a battery cell 10, a thermal management component 30, and an adhesive layer 40. The battery cell 10 includes a housing 11, which includes a casing 112 and an end cap 111. The casing 112 includes a bottom wall 1121 and a side wall 1122, which are integrally formed. The side wall 1122 surrounds the bottom wall 1121, with one end connected to the bottom wall 1121 and the other end forming an opening 1123. The end cap 111 covers the opening 1123. The bottom wall 1121 has a first surface 1131 facing the thermal management component 30. The thermal management component 30 has a flow channel 33 formed inside to accommodate a heat exchange medium, and it has a second surface 311 facing the battery cell 10. A first tip discharge portion a is provided on the first surface 1131. The first tip discharge portion a is a recess, and the bottom wall 1121 is stamped to form the recess. Along a direction perpendicular to the first surface 1131, the projection of the first tip discharge portion a at least partially overlaps with the projection of the flow channel 33. A second tip discharge portion b is provided on the second surface 311. The second tip discharge portion b is a protrusion, and the thermal management component 30 is stamped to form the protrusion. The height of the protrusion from the first surface 1131 is between 0.1 mm and 2 mm. Along a direction perpendicular to the second surface 311, the projection of the second tip discharge portion b at least partially overlaps with the projection of the flow channel 33. The protrusion is accommodated within the recess.

[0147] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0148] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, comprising: A battery cell, including a housing, the housing having a first wall; A thermal management component is thermally connected to the first wall, and the interior of the thermal management component has a flow channel for accommodating the heat exchange medium; The first wall has a first surface facing the thermal management component, and the thermal management component has a second surface facing the battery cell. The first surface is provided with a first tip discharge section; And / or, The second surface is provided with a second tip discharge section.

2. The battery according to claim 1, wherein, The first tip discharge portion is a protrusion or a recess; and / or, the second tip discharge portion is a protrusion or a recess.

3. The battery according to claim 2, wherein, One of the first tip discharge portion and the second tip discharge portion is a protrusion and the other is a recess, with at least a portion of the protrusion being accommodated in the recess.

4. The battery according to any one of claims 1-3, wherein, The first tip discharge portion is provided in multiple ways, and the multiple first tip discharge portions are arranged at intervals; and / or, the second tip discharge portion is provided in multiple ways, and the multiple second tip discharge portions are arranged at intervals.

5. The battery according to any one of claims 1-4, wherein, The first tip discharge portion is integrally formed with the first wall.

6. The battery according to any one of claims 1-5, wherein, The thermal management component includes a first plate and a second plate stacked together. The surface of the second plate facing the first plate has a groove. The first plate covers the groove to form the flow channel. The surface of the first plate away from the second plate is the second surface. The second tip discharge part is integrally formed with the first plate.

7. The battery according to any one of claims 1-6, wherein, Along a direction perpendicular to the first surface, the projection of the first tip discharge portion at least partially overlaps with the projection of the flow channel; and / or, Along a direction perpendicular to the second surface, the projection of the second tip discharge portion at least partially overlaps with the projection of the flow channel.

8. The battery according to any one of claims 1-7, wherein, The battery further includes an adhesive layer, at least a portion of which is disposed between the first surface and the second surface.

9. The battery according to any one of claims 1-8, wherein, The outer casing includes a housing and an end cap. The housing includes a bottom wall and a side wall. The side wall surrounds the bottom wall. One end of the side wall is connected to the bottom wall, and the other end forms an opening. The end cap covers the opening. The bottom wall is the first wall.

10. An electrical device comprising the battery of any one of claims 1-9, the battery being used to supply power to the electrical device.

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