Battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery and electric equipment, and the battery comprises a battery monomer and a liquid cooling plate. Each single battery comprises a pole end and a bottom end opposite to the pole end, and a pressure relief structure is arranged at the bottom end; the liquid cooling plate is arranged at the bottom end, a part of the liquid cooling plate corresponds to the pressure relief structure, and the surface of the liquid cooling plate is provided with a first electrolyte-repellent layer. According to the battery provided by the invention, the electrolyte-repellent treatment is performed on the surface of the liquid cooling plate, so that the contact angle between the surface of the liquid cooling plate and the electrolyte is increased, and the climbing rate of the electrolyte in the spray valve object on the liquid cooling plate is slowed down, thereby reducing the probability that the electrolyte in the spray valve object spreads to the battery pole along the gap.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular provides a battery and an electrical device having the battery. Background Art

[0002] At present, batteries are widely used in various electrical equipment, such as new energy vehicles, and corresponding energy storage devices.

[0003] In order to reduce the harm caused by battery thermal runaway, a pressure relief structure is usually added to the battery. For batteries where the pole and the pressure relief structure are set on different sides, especially when the liquid cooling plate is located on the side of the battery pressure relief structure, a gap will be formed between the liquid cooling plate and the side of the battery. Once thermal runaway occurs, the spray can spread from the gap to the pole, eventually causing more serious thermal runaway consequences. Utility Model Content

[0004] The utility model aims to provide a battery and an electrical device, aiming to improve the problem that when the battery has thermal runaway, the spray valve material thereof rises too fast on the liquid cooling plate.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] In a first aspect, an embodiment of the present application provides a battery, comprising:

[0007] A battery cell, the battery cell comprising a pole end and a bottom end opposite to the pole end, wherein a pressure relief structure is provided at the bottom end;

[0008] A liquid cooling plate is arranged at the bottom end and corresponds to the pressure relief structure, and a surface of the liquid cooling plate has a first electrolyte-phobic layer.

[0009] Beneficial effects of the embodiments of the present application: The battery provided by the present application is subjected to electrolyte-phobic treatment on the surface of the liquid cooling plate to form a first electrolyte-phobic layer, so that the contact angle between the surface of the liquid cooling plate and the electrolyte is increased, and the climbing rate of the electrolyte in the spray valve on the liquid cooling plate is slowed down, thereby reducing the probability of the electrolyte in the spray valve spreading along the gap to the battery pole.

[0010] In some embodiments, the first electrolyte-phobic layer is a first electrolyte-phobic coating coated on the surface of the liquid cooling plate.

[0011] In some embodiments, the first electrolyte-phobic layer is a first polishing layer formed on the surface of the liquid cooling plate.

[0012] In some embodiments, the liquid cooling plate is provided with an opening, the opening corresponds to the pressure relief structure, and the liquid cooling plate has the first electrolyte-phobic layer in the peripheral area of ​​the opening.

[0013] In some embodiments, the battery further comprises a fixing member, wherein the fixing member is disposed between the bottom end and the liquid cooling plate, and a surface of the fixing member is treated with a second electrolyte-phobic treatment.

[0014] In some embodiments, the second electrolyte-phobic layer is a second electrolyte-phobic coating coated on the surface of the fixing member.

[0015] In some embodiments, the second electrolyte-phobic layer is a second polishing layer formed on the surface of the fixing member.

[0016] In some embodiments, the battery further comprises a sealing layer, wherein the sealing layer is disposed between the bottom end and the liquid cooling plate, and a surface of the sealing layer comprises a third electrolyte-phobic layer.

[0017] In some embodiments, the third electrolyte-phobic layer is a third electrolyte-phobic coating coated on the surface of the sealing layer.

[0018] In some embodiments, the third electrolyte-phobic layer is a third polishing layer formed on the surface of the sealing layer.

[0019] In some embodiments, the battery includes a bottom plate, the bottom plate and the liquid cooling plate are spaced apart to form a receiving cavity, and the receiving cavity is communicated with the opening.

[0020] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the battery described above.

[0021] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an electrical device provided in some embodiments of the utility model;

[0024] Figure 2 An exploded view of a battery provided in some embodiments of the present utility model;

[0025] Figure 3 A cross-sectional view of a battery provided in Example 1 of the utility model;

[0026] Figure 4 A cross-sectional view of a battery provided in Example 2 of the utility model;

[0027] Figure 5 This is a cross-sectional view of a battery provided in Embodiment 3 of the present utility model.

[0028] Among them, the reference numerals in the figure are:

[0029] 1000. Electrical equipment;

[0030] 100, battery, 200, controller; 300, motor 300;

[0031] 10. Battery cell; 10a. Pole end; 10b. Bottom end; 10c. Pressure relief structure;

[0032] 20. Box body; 21. First part; 22. Second part; 23. Bottom plate; 23a. Accommodating cavity.

[0033] 30. Liquid cooling plate; 30a. First electrolyte-repellent layer; 31. Opening;

[0034] 40, fixing member; 40a, second electrolyte-repellent layer;

[0035] 50, sealing layer; 50a, third electrolyte-repellent layer. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0041] In some cases, the battery includes a housing, a plurality of battery cells, and corresponding electrical structural parts. In order to balance the performance of each battery cell during operation, each battery cell is usually cooled, that is, a liquid cooling mechanism is provided between or at the bottom of each battery cell. However, for a battery cell in which the pole and the pressure relief structure are arranged relative to each other, the pressure relief structure should be facing the liquid cooling mechanism, and a corresponding avoidance hole will also be provided on the liquid cooling mechanism, which corresponds to the pressure relief structure to allow the spray valve of the pressure relief structure to flow out through the avoidance hole. In this case, there is a structural gap between the bottom of the battery cell and the surface of the liquid cooling plate, and the electrolyte in the spray valve ejected from the pressure relief structure can spread from the structural gap between the two to the pole of the battery cell, thereby causing more serious thermal runaway consequences.

[0042] In view of this, the present application provides a battery, in which the surface of the liquid cooling plate is treated to be electrolyte-phobic, that is, the contact angle between the surface of the liquid cooling plate and the electrolyte is increased to slow down the climbing rate of the electrolyte on the surface of the liquid cooling plate, thereby reducing the probability of the electrolyte in the spray valve spreading along the gap to the battery pole.

[0043] The box disclosed in the embodiment of the present application is used for battery assembly, and the assembled battery can be used as a power source for electrical equipment, or various energy storage systems. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0044] The embodiment of the present application provides an electric device 1000 that can be applied to vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric tools, etc. using the above-mentioned battery. Among them, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles and spacecrafts, etc.; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and iron electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0045] The battery described in the embodiments of the present application is not limited to the above-described electrical equipment 1000, but can also be applied to all equipment or devices using such batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0046] For example, see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. The vehicle 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 or an extended-range vehicle, etc. A battery 100, a controller 200 and a motor 300 may be arranged inside the vehicle, and the controller 200 is used to control the battery 100 to supply power to the motor 300. For example, a battery 100 may be arranged at the bottom, front or rear of the vehicle. The battery 100 may be used to power the vehicle. For example, the battery 100 may be used as an operating power source for the vehicle, for the circuit system of the vehicle, for example, for the working power requirements during the start-up, navigation and operation of the vehicle. In another embodiment of the present application, the battery 100 may not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0047] The battery 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. Figure 2 , the battery 100 may include a plurality of battery cells 10. The number of battery cells 10 and the connection between the battery cells 10 can be set as required to meet different power requirements. Specifically, a plurality of battery cells 10 can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series connection and parallel connection so that the battery 100 has a larger capacity or power. Optionally, a plurality of battery cells 10 can be first connected in series, in parallel, or in mixed connection to form a battery module, and a plurality of battery modules can then be connected in series, in parallel, or in mixed connection to form a battery 100. In other words, a plurality of battery cells can directly form a battery 100, or they can first form a battery module, and then the battery module can form a battery 100.

[0048] The battery cell 10 includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 10 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab. For the convenience of description, the tab is referred to as the positive electrode tab and / or the negative electrode tab below.

[0049] Electrolyte refers to a liquid that can conduct electricity and undergo chemical reactions during electrolysis. The characteristics of the electrolyte depend on the desired electrolysis process and the electrode materials used. In an electrolytic cell, the electrolyte is a solution formed by dissolving electrolytes in a solvent. The electrolyte in the electrolyte can be a salt, acid, alkali or other ionic compound. Its purpose is to provide ionized ions to transmit current during the electrolysis process and to cause redox reactions on the electrodes.

[0050] Among them, the electrolyte may include salt solution, acid solution, alkaline solution and organic solution, etc. Therefore, in the event of thermal runaway, the main fluid in the spray valve is the electrolyte, and the electrolyte has a conductive effect on the poles of the battery cell. Therefore, thermal runaway can spread from one battery cell to all battery cells through the electrolyte.

[0051] In the present application, the battery cell 10 includes but is not limited to a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell. The battery cell may be cylindrical, flat, rectangular or other shapes. The battery cell 10 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells.

[0052] Please refer to Figure 2 The battery 100 further includes a battery case 20, wherein the battery case 20 has a storage space inside, and a plurality of battery cells are stored in the storage space. Figure 2As shown, the battery box 20 may include two parts, which are respectively referred to as the first part 21 and the second part 20. The first part 21 and the second part 20 may be connected by snapping, bonding, etc. to form a receiving space. A plurality of battery cells are connected in parallel, in series, or in a mixed combination and placed in the box formed by connecting the first part 21 and the second part 20. The shapes of the first part 21 and the second part 20 may be determined according to the shape formed by the combination of a plurality of battery cells.

[0053] The battery case 20 is used to protect at least one battery cell 10 , thereby reducing the influence of liquid or other foreign matter outside the battery 100 on the charging or discharging of at least one battery cell 10 .

[0054] Please refer to Figure 3 A battery 100 provided in an embodiment of the present application includes a battery cell 10 and a liquid cooling plate 30 .

[0055] The battery cell 10 includes a pole end 10a and a bottom end 10b opposite to the pole end 10a, and a pressure relief structure 10c is provided at the bottom end 10b;

[0056] The liquid cooling plate 30 is disposed at the bottom end 10 b and a portion of the liquid cooling plate 30 corresponds to the pressure relief structure 10 c . The surface of the liquid cooling plate 30 has a first electrolyte-phobic layer 30 a .

[0057] It can be understood that the pole end 10a of the battery cell 10 is the end side of the battery cell 10 having the pole, and the bottom end 10b of the battery cell 10 is the end side corresponding to the pole end 10a of the battery cell 10, and is also the end side of the battery cell 10 that contacts the bottom surface of the box body 20 when working.

[0058] The pressure relief structure 10c includes but is not limited to explosion-proof valves, pressure relief valves and other valve bodies, etc. The pressure relief structure 10c is arranged at the bottom 10b of the battery cell 10 to reduce the probability of direct contact between the valve spray and the pole due to thermal runaway.

[0059] The liquid cooling plate 30 is used to control the temperature of the battery cell 10 , that is, to meet the requirement of heat exchange with the battery cell 10 so that the battery cell 10 maintains good performance in a working state.

[0060] The structural forms of the liquid cooling plate 30 include, but are not limited to, a flat liquid cooling plate, a tubular liquid cooling plate, a spiral liquid cooling plate, a multi-layer plate liquid cooling plate, a microporous plate liquid cooling plate, and a lumped liquid cooling plate.

[0061] The liquid cooling plate 30 is connected to the bottom end 10b of the battery cell 10, so there will be a corresponding structural gap between the surface of the liquid cooling plate 30 and the bottom end 10b of the battery cell 10. Once thermal runaway occurs, the pressure relief structure 10c will spray out a spray valve, and the fluid in the spray valve is mainly electrolyte. The electrolyte can pass through the above-mentioned structural gap and spread to the pole end 10a of the battery cell 10. The electrolyte contacts the pole of the battery cell 10, so that the thermal runaway spreads from point to surface. Therefore, the surface of the liquid cooling plate 30 is treated with electrolyte repellency to increase the contact angle between the surface of the liquid cooling plate 30 and the electrolyte, so that the climbing rate of the electrolyte on the surface of the liquid cooling plate 30 is slowed down, so as to reduce the probability of the electrolyte flowing through the above-mentioned structural gap.

[0062] The contact angle refers to the angle formed when a liquid contacts a solid surface. When the contact angle is greater than 90 degrees, the liquid drop cannot fully spread on the solid surface and becomes non-wetting. This also means that the liquid is more inclined to form a sphere, reducing the contact area with the solid surface. Therefore, the surface of the liquid cooling plate 30 is subjected to a repellent treatment, the purpose of which is to increase the contact angle between the surface of the liquid cooling plate 30 and the electrolyte, so that the surface of the liquid cooling plate 30 exhibits repellency to the electrolyte.

[0063] The first electrolyte-repellent layer 30a on the surface of the liquid cooling plate 30 may be an additional coating applied on the surface of the liquid cooling plate 30, and the repellent effect is achieved by utilizing the larger contact angle between the surface of the new coating and the electrolyte and the poor wettability.

[0064] For example, the coating on the surface of the liquid cooling plate 30 may be a fluoropolymer coating (polytetrafluoroethylene, polyperfluoroalkylethylene), a silicon-based coating, a nanostructure coating, and an organic silicon coating.

[0065] The surface of the liquid cooling plate 30 has a first electrolyte-repellent layer 30a. The surface of the liquid cooling plate 30 may be polished to form a polishing layer, thereby reducing the roughness of the surface of the liquid cooling plate 30 and increasing the contact angle between the surface of the liquid cooling plate 30 and the electrolyte.

[0066] For example, the surface polishing treatment of the liquid cooling plate 30 includes, but is not limited to, mechanical polishing, chemical polishing, electrochemical polishing, chemical etching, and the like.

[0067] Meanwhile, the area on the surface of the liquid cooling plate 30 that is treated with electrolyte repellency may be the entire surface of the liquid cooling plate 30 or a partial surface of the liquid cooling plate 30 , especially the surface of the liquid cooling plate 30 where the spray material will pass.

[0068] The battery 100 provided in the present application forms a first electrolyte-phobic layer 30a on the surface of the liquid cooling plate 30, so that the contact angle between the surface of the liquid cooling plate 30 and the electrolyte is increased, and the climbing rate of the electrolyte in the valve spray on the liquid cooling plate 30 is slowed down, thereby reducing the probability of the electrolyte in the valve spray spreading along the gap to the battery pole.

[0069] In some embodiments, the first electrolyte-phobic layer 30 a is a first electrolyte-phobic coating coated on the surface of the liquid cooling plate 30 .

[0070] It can be understood that the first electrolyte-phobic coating is a coating having a contact angle with the electrolyte greater than 90 degrees, and the electrolyte in the spray valve cannot be fully spread on the surface of the first electrolyte-phobic coating, that is, it has a non-wetting relationship with the electrolyte, that is, the first electrolyte-phobic coating exhibits electrolyte-phobicity.

[0071] The first electrolyte-phobic coating includes, but is not limited to, a fluoropolymer coating (polytetrafluoroethylene, polyperfluoroalkylethylene), a silicon-based coating, a nanostructured coating, and an organic silicon coating.

[0072] At the same time, the area on the surface of the liquid cooling plate 30 coated with the first electrolyte coating can be the entire surface of the liquid cooling plate 30, or it can be a partial surface of the liquid cooling plate 30, especially the surface of the liquid cooling plate 30 where the spray valve object will pass.

[0073] In this way, by adding an electrolyte-phobic layer 30a on the surface of the liquid cooling plate 30, the structural improvement of the liquid cooling plate 30 is relatively small, which is suitable for use scenarios where the incoming materials of the liquid cooling plate 30 have relatively small variability.

[0074] In some embodiments, the first electrolyte-phobic layer 30 a is a first polishing layer formed on the surface of the liquid cooling plate 30 .

[0075] It can be understood that the first polishing layer is formed after the surface of the liquid cooling plate 30 is polished, and the first polishing layer can reduce the roughness of the surface of the liquid cooling plate 30 and increase the contact angle between the surface of the liquid cooling plate 30 and the electrolyte.

[0076] The surface polishing method of the liquid cooling plate 30 to form the first polishing layer includes but is not limited to mechanical polishing, chemical polishing, electrochemical polishing, chemical etching, etc.

[0077] Similarly, the surface of the liquid cooling plate 30 may be polished on the entire surface of the liquid cooling plate 30 or on a partial surface of the liquid cooling plate 30 , especially the surface of the liquid cooling plate 30 where the spray material will pass.

[0078] In this way, the polishing treatment of the surface of the liquid cooling plate 30 is more suitable for polishing a part of the surface of the liquid cooling plate 30 , and the process is simpler.

[0079] Please refer to Figure 3In some embodiments, an opening 31 is formed on the liquid cooling plate 30 , and the opening 31 corresponds to the pressure relief structure 10 c . The liquid cooling plate 30 has a first electrolyte-phobic layer 30 a in the peripheral area of ​​the opening 31 .

[0080] It can be understood that the opening 31 is used to avoid the pressure relief structure 10 c, so that there is a certain avoidance space after the pressure relief structure 10 c is separated from the battery cell 10 . At the same time, the spray ejected from the pressure relief structure 10 c can also flow out from the opening 31 .

[0081] The peripheral area of ​​the liquid cooling plate 30 at the opening 31 refers to the surface area of ​​the liquid cooling plate 30 surrounding the opening 31 .

[0082] Treating the local area of ​​the liquid cooling plate 30 with electrolyte repellency can increase the contact angle between the area and the electrolyte, thereby slowing down the climbing rate of the electrolyte in the peripheral area of ​​the opening 31. Then, under the action of gravity, the electrolyte is more likely to enter the opening 31 and be discharged to the outside, rather than climbing from the area to the structural gap.

[0083] In this way, an opening 31 corresponding to the pressure relief structure 10c is opened on the liquid cooling plate 30 to ensure that the spray valve material can be quickly discharged from the opening 31, and the area of ​​the liquid cooling plate 30 outside the opening 31 is treated with electrolyte repellency. Under the action of gravity, the electrolyte is more likely to enter the opening 31 and be discharged to the outside, rather than climbing from the area to the structural gap.

[0084] Please refer to Figure 4 In some embodiments, the battery 100 further includes a fixing member 40 , which is disposed between the bottom end 10 b and the liquid cooling plate 30 , and a surface of the fixing member 40 has a second electrolyte-phobic layer 40 a .

[0085] It can be understood that the fixing member 40 is used to support the bottom end 10 b of the battery cell 10 to form a corresponding space.

[0086] The structural form of the fixing member 40 includes but is not limited to a bracket, a support block, a support pad, etc., and the material of the fixing member 40 is a non-conductive material, such as plastic, rubber, silicone, etc.

[0087] Since the fixing member 40 is located between the bottom end 10b and the liquid cooling plate 30, the electrolyte in the spray valve may also be spread by the fixing member 40. Therefore, it is necessary to treat the fixing member 40 to be electrolyte-repellent.

[0088] Similarly, a second electrolyte-repellent layer 40a is formed on the surface of the fixing member 40, which may be a coating directly applied, or a polishing layer formed by surface polishing to achieve the repellent effect.

[0089] In some embodiments, the second electrolyte-phobic layer 40 a is a second electrolyte-phobic coating coated on the surface of the fixing member 40 .

[0090] Similarly, the second electrolyte-phobic coating is a coating having a contact angle with the electrolyte greater than 90 degrees, and the electrolyte of the valve species cannot be fully spread on the surface of the second electrolyte-phobic coating, that is, it has a non-wetting relationship with the electrolyte, that is, the second electrolyte-phobic coating exhibits electrolyte-phobicity.

[0091] The material of the second electrolyte-phobic coating may be the same as or different from that of the first electrolyte-phobic coating. Specifically, the material of the second electrolyte-phobic coating includes, but is not limited to, a fluoropolymer coating (polytetrafluoroethylene, polyperfluoroalkylethylene), a silicon-based coating, a nanostructured coating, and a silicone coating.

[0092] At the same time, the area on the surface of the fixing member 40 having the second electrolyte-phobic coating may be the entire surface of the fixing member 40 or a partial surface of the fixing member 40 , especially the surface of the fixing member 40 where the spray valve object will pass.

[0093] In some embodiments, the second electrolyte-phobic layer 40 a is a second polishing layer formed on the surface of the fixing member 40 .

[0094] It can be understood that the surface of the fixing member 40 is polished to form a second polishing layer, and the second polishing layer can reduce the roughness of the surface of the fixing member 40 and increase the contact angle between the fixing member 40 and the electrolyte.

[0095] The method of polishing the surface of the fixing member 40 to form the second polishing layer includes but is not limited to mechanical polishing, chemical polishing, electrochemical polishing, chemical etching, etc.

[0096] Similarly, the surface of the fixing member 40 may be polished on the entire surface of the fixing member 40 or on a partial surface of the fixing member 40 , especially on the surface of the fixing member 40 where the spray valve material will pass.

[0097] Please refer to Figure 5 In some embodiments, the battery 100 further includes a sealing layer 50 , which is disposed between the bottom end 10 b and the liquid cooling plate 30 , and a surface of the sealing layer 50 has a third electrolyte-phobic layer 50 a .

[0098] It can be understood that the sealing layer 50 is used to seal the structural gap between the bottom end 10b and the surface of the liquid cooling plate 30, thereby reducing the probability of the electrolyte in the spray valve flowing through the structural gap to the outside.

[0099] The sealing layer 50 includes but is not limited to a sealing ring, a sealing gasket, a sealing block, and a sealing coating.

[0100] The sealing layer 50 should have a certain flexibility and be appropriately deformed under the gravity of the battery cell 10 to seal the structural gap between the bottom end 10b and the surface of the liquid cooling plate 30. Therefore, the sealing layer 50 is made of rubber, resin, plastic, etc.

[0101] At the same time, the surface of the sealing layer 50 can also be treated with electrolyte repellency to form a third electrolyte repellent layer 50a. Similarly, the third electrolyte repellent layer 50a formed on the surface of the sealing layer 50 can be a coating directly applied, or it can be a polishing layer formed by surface polishing to achieve the repellency effect.

[0102] In some embodiments, the third electrolyte-phobic layer 50 a is a third electrolyte-phobic coating layer coated on the surface of the sealing layer 50 .

[0103] Similarly, the third electrolyte-phobic coating is a coating having a contact angle with the electrolyte greater than 90 degrees, and the electrolyte of the valve species cannot be fully spread on the surface of the third electrolyte-phobic coating, that is, it has a non-wetting relationship with the electrolyte, that is, the third electrolyte-phobic coating exhibits electrolyte-phobicity.

[0104] The material of the third hydrophobic electrolyte coating may be the same as or different from that of the first hydrophobic electrolyte coating. Specifically, the material of the third hydrophobic electrolyte coating includes but is not limited to fluoropolymer coating (polytetrafluoroethylene, polyperfluoroalkylethylene), silicon-based coating, nanostructured coating and silicone coating.

[0105] At the same time, the area on the surface of the sealing layer 50 having the third electrolyte-phobic coating may be the entire surface of the sealing layer 50 or a partial surface of the sealing layer 50 , especially the surface of the sealing layer 50 where the spray valve material will pass.

[0106] In some embodiments, the third electrolyte-phobic layer 50 a is a third polishing layer formed on the surface of the sealing layer 50 .

[0107] It can be understood that the surface of the sealing layer 50 is polished to form a third polishing layer, and the third polishing layer can reduce the roughness of the surface of the sealing layer 50 and increase the contact angle between the sealing layer 50 and the electrolyte.

[0108] The method of polishing the surface of the sealing layer 50 to form the third polishing layer includes but is not limited to mechanical polishing, chemical polishing, electrochemical polishing, chemical etching, etc.

[0109] Similarly, the surface of the sealing layer 50 may be polished on the entire surface of the sealing layer 50 or on a partial surface of the sealing layer 50 , especially on the surface of the sealing layer 50 where the spray material will pass.

[0110] Please refer to Figures 3 to 5In some embodiments, the battery 100 includes a bottom plate 23 , the bottom plate 23 and the liquid cooling plate 30 are spaced apart to form a receiving cavity 23 a , and the receiving cavity 23 a is connected to the opening 31 .

[0111] It can be understood that the bottom plate 23 should be a part of the box body, and a receiving chamber 23a is formed between the bottom plate 23 and the liquid cooling plate 30 for accommodating the valve spray of the battery cell 10 during thermal runaway. After the pressure relief structure 10c is destroyed, the valve spray enters the receiving chamber 23a through the opening 31 and is collected or discharged to the outside. Therefore, the residence time of the valve spray between the liquid cooling plate 30 and the end of the battery cell 10 is reduced. Similarly, the probability of the electrolyte of the valve spray spreading from the structural gap to the pole end 10a of the battery cell 10 can be greatly reduced.

[0112] Please refer to Figures 3 to 5 In a specific embodiment, the battery 100 includes a battery cell 10 , a liquid cooling plate 30 , a fixing member 40 , a sealing layer 50 and a bottom plate 23 .

[0113] The battery cell 10 includes a pole end 10a and a bottom end 10b opposite to the pole end 10a, and a pressure relief structure 10c is provided at the bottom end 10b;

[0114] The liquid cooling plate 30 is disposed at the bottom end 10b and a portion of the liquid cooling plate 30 corresponds to the pressure relief structure 10c. A first electrolyte-repelling layer 30a is formed on the surface of the liquid cooling plate 30. The first electrolyte-repelling layer 30a can be an additional coating on the surface of the liquid cooling plate 30, and the contact angle between the surface of the new coating and the electrolyte is poor in wettability to achieve the repelling effect. The surface of the liquid cooling plate 30 can also be polished to form a polishing layer, and the contact angle between the surface of the liquid cooling plate 30 and the electrolyte is increased by reducing the roughness of the surface of the liquid cooling plate 30.

[0115] The liquid cooling plate 30 is provided with an opening 31, which corresponds to the pressure relief structure 10c. The liquid cooling plate 30 is treated to be electrolyte-repellent in the peripheral area of ​​the opening 31. The electrolyte-repellent treatment of the peripheral area of ​​the opening 31 of the liquid cooling plate 30 can increase the contact angle between the area and the electrolyte, thereby slowing down the climbing rate of the electrolyte in the peripheral area of ​​the opening 31. Then, under the action of gravity, the electrolyte is more likely to enter the opening 31 and be discharged to the outside, rather than climbing from the area to the structural gap.

[0116] The fixing member 40 is disposed between the bottom end 10b and the liquid cooling plate 30, and the surface of the fixing member 40 has a second electrolyte-repellent layer 40a. The structural form of the fixing member 40 includes but is not limited to a bracket, a support block, a support pad, etc., and the material of the fixing member 40 is a non-conductive material, such as plastic, rubber, silicone, etc.

[0117] Since the fixing member 40 is located between the bottom end 10b and the liquid cooling plate 30, the electrolyte in the spray valve may also be spread by the fixing member 40. Therefore, it is necessary to treat the fixing member 40 to be electrolyte-repellent.

[0118] Similarly, the second electrolyte-phobic layer 40a on the surface of the fixing member 40 may be a coating layer that is directly applied, or may be a polishing layer formed by surface polishing.

[0119] The sealing layer 50 is disposed between the bottom end 10b and the liquid cooling plate 30, and the sealing layer 50 is disposed around the fixing member 40, and the surface of the sealing layer 50 has a third electrolyte-phobic layer 50a. Similarly, the third electrolyte-phobic layer 50a on the surface of the sealing layer 50 can be a coating directly applied, or can be a polishing layer formed by surface polishing.

[0120] The bottom plate 23 and the liquid cooling plate 30 are arranged at intervals to form a receiving chamber 23a, and the receiving chamber 23a is connected to the opening 31. Here, the bottom plate 23 should be a part of the box body, and the receiving chamber 23a is formed between the bottom plate 23 and the liquid cooling plate 30 to accommodate the valve spray of the battery cell 10 during thermal runaway. After the pressure relief structure 10c is destroyed, the valve spray enters the receiving chamber 23a from the opening 31 and is collected or discharged to the outside, thereby reducing the residence time of the valve spray between the liquid cooling plate 30 and the end of the battery cell 10. Similarly, the probability of the electrolyte of the valve spray spreading from the structural gap to the pole end 10a of the battery cell 10 can be greatly reduced.

[0121] According to some embodiments of the present application, the present application also provides an electric device 1000 including the above-mentioned battery 100.

[0122] The power-consuming device 1000 may be any of the aforementioned devices or energy storage systems using the battery 100 .

[0123] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0124] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: include: A battery cell, the battery cell comprising a pole end and a bottom end opposite to the pole end, wherein a pressure relief structure is provided at the bottom end; A liquid cooling plate is arranged at the bottom end and a portion of the liquid cooling plate corresponds to the pressure relief structure, and a surface of the liquid cooling plate has a first electrolyte-phobic layer.

2. The battery according to claim 1, characterized in that: The first electrolyte-phobic layer is a first electrolyte-phobic coating coated on the surface of the liquid cooling plate.

3. The battery according to claim 1, characterized in that: The first electrolyte-phobic layer is a first polishing layer formed on the surface of the liquid cooling plate.

4. The battery according to any one of claims 1 to 3, characterized in that: The liquid cooling plate is provided with an opening, the opening corresponds to the pressure relief structure, and the liquid cooling plate has the first electrolyte-phobic layer in the peripheral area of ​​the opening.

5. The battery according to any one of claims 1 to 3, characterized in that: The battery further comprises a fixing part, wherein the fixing part is arranged between the bottom end and the liquid cooling plate, and a second electrolyte-phobic layer is provided on a surface of the fixing part.

6. The battery according to claim 5, characterized in that: The second electrolyte-phobic layer is a second electrolyte-phobic coating coated on the surface of the fixing member.

7. The battery according to claim 5, characterized in that: The second electrolyte-phobic layer is a second polishing layer formed on the surface of the fixing member.

8. The battery according to any one of claims 1 to 3, characterized in that: The battery further comprises a sealing layer, which is arranged between the bottom end and the liquid cooling plate, and a surface of the sealing layer comprises a third electrolyte-phobic layer.

9. The battery according to claim 8, characterized in that: The third electrolyte-phobic layer is a third electrolyte-phobic coating layer coated on the surface of the sealing layer.

10. The battery according to claim 8, characterized in that: The third electrolyte-phobic layer is a third polishing layer formed on the surface of the sealing layer.

11. The battery according to claim 4, characterized in that: The battery comprises a bottom plate, the bottom plate and the liquid cooling plate are spaced apart to form a receiving cavity, and the receiving cavity is communicated with the opening.

12. An electrical equipment, characterized in that: Comprising a battery as claimed in any one of claims 1 to 11.

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