Battery and electric device

Abstract

The application discloses a battery and an electric device. The battery comprises a shell, a storage cavity and a first through hole, the storage cavity and the first through hole are communicated, an electric core is arranged in the storage cavity, a blocking piece comprises a body part and a protruding part, the protruding part is connected to the body part and protrudes relative to the body part, the body part is arranged in the first through hole, a locking piece is arranged in the storage cavity, the locking piece is connected to the body part, the locking piece and the protruding part are clamped to the inner surface and the outer surface of the shell respectively, so that the pre-tightening force is generated on the inner surface and the outer surface of the shell, wherein the locking piece is configured to melt when the temperature of the electric core reaches a threshold value, so that the pre-tightening force is eliminated, and the pressure of the storage cavity is released through the first through hole. The battery of the application not only can release pressure, but also can improve the passing rate of the battery drop test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and an electric device. BACKGROUND

[0002] In the related art, when a battery is overcharged or discharged, or in a high-temperature environment, or when the battery is mechanically damaged, or when the battery is internally short-circuited, the battery may have a thermal runaway phenomenon, thereby causing the battery to explode and the like. In order to effectively avoid the battery from exploding, a pressure relief valve can be provided, so that high-temperature and high-pressure gas is discharged as soon as possible when the battery is in thermal runaway.

[0003] The existing battery pressure relief method is to engrave a groove on the shell. When the battery is in thermal runaway, the thickness of the shell at the groove is relatively thin, and the mechanical strength is relatively low, which can facilitate the gas to break through the shell and thereby relieve pressure. However, such a method can reduce the pass rate of the battery in drop test. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery which not only can relieve pressure, but also can improve the pass rate of the battery in drop test.

[0005] The present application also provides an electric device.

[0006] The battery according to the first aspect of the present application comprises:

[0007] a shell having a storage cavity and a first through hole, the storage cavity and the first through hole being in communication;

[0008] an electric core arranged in the storage cavity;

[0009] a blocking member comprising a body portion and a protruding portion, the protruding portion being connected to the body portion and protruding relative to the body portion, the body portion being arranged in the first through hole;

[0010] a locking member arranged in the storage cavity, the locking member being connected to the body portion, the locking member and the protruding portion being clamped to the inner surface and the outer surface of the shell, respectively, to generate a pre-tightening force on the inner surface and the outer surface of the shell, wherein the locking member is configured to melt when the temperature of the electric core reaches a threshold value, so as to eliminate the pre-tightening force, and the pressure of the storage cavity is relieved through the first through hole.

[0011] The battery according to the embodiments of the present application has at least the following beneficial effects: the body part of the plugging member is arranged in the first through hole, the locking member and the protruding part are clamped to the inner surface and the outer surface of the shell respectively to generate pre-tightening force on the inner surface and the outer surface of the shell, thus, no notch is arranged on the shell, the shell will not be easily damaged due to low mechanical strength when the battery is subjected to drop test, and since the locking member and the protruding part exert pre-tightening force on the shell, the body part can stably plug the first through hole, further, when the battery cell is in thermal runaway, high temperature and high pressure in the storage cavity can melt the locking member, which can eliminate the pre-tightening force of the locking member and the protruding part on the shell, so as to loosen the plugging member, and the high-pressure gas in the storage cavity can be discharged from the first through hole, which can effectively improve the safety of the battery. Specifically, the battery can not only be discharged, but also can improve the pass rate of drop test.

[0012] The battery according to some embodiments of the present application, the body part is provided with a second through hole, and the locking member is arranged in the second through hole.

[0013] The battery according to some embodiments of the present application, the battery further comprises a first sealing member, the first sealing member comprises a first part and a second part, the first part is connected to the second part, and the first part protrudes relative to the second part, the first part is arranged in the first through hole, and two sides of the first sealing member abut against the plugging member and the shell respectively.

[0014] The battery according to some embodiments of the present application, the battery further comprises a second sealing member, the second sealing member is arranged in the storage cavity, the second sealing member is provided with a third through hole, the first part is arranged in the third through hole, and two sides of the second sealing member abut against the shell and the locking member respectively.

[0015] The battery according to some embodiments of the present application, the battery further comprises a pressing member, the pressing member is made of metal, and the pressing member is located between the locking member and the second sealing member.

[0016] The battery according to some embodiments of the present application, along the thickness direction of the pressing member, the distance from the protruding part to the locking member is T1, the size of the second part is H1, the thickness of the cavity wall of the storage cavity is H2, the size of the second sealing member is H3, and the size of the pressing member is H4, T1

[0017] The battery according to some embodiments of the present application, when the locking member and the protruding portion are clamped to the inner surface and the outer surface of the shell respectively, the size of the second portion along the thickness direction of the second portion is A1, the size of the second sealing member is B1, when the locking member releases the pre-tightening force, the size of the second portion is A2, the size of the second sealing member is B2, 50% (A2+B2)≤A1+B1≤80% (A2+B2).

[0018] The battery according to some embodiments of the present application, the locking member comprises a metal member and a glue layer, and the glue layer wraps the metal member.

[0019] The battery according to some embodiments of the present application, the cell comprises a tab, and the blocking member and the tab are electrically connected.

[0020] The electrical device according to the second aspect of the embodiments of the present application comprises the battery according to any one of the first aspect of the embodiments.

[0021] The electrical device according to the embodiments of the present application has at least the following beneficial effects: the body portion of the blocking member is arranged in the first through hole, the locking member and the protruding portion are clamped to the inner surface and the outer surface of the shell respectively to generate a pre-tightening force on the inner surface and the outer surface of the shell, thus, no notch is arranged on the shell, the shell will not be easily damaged due to low mechanical strength during the drop test of the battery, and since the locking member and the protruding portion exert a pre-tightening force on the shell, the body portion can stably block the first through hole, further, when the cell is in thermal runaway, the high temperature and high pressure in the storage cavity can melt the locking member, which can eliminate the pre-tightening force of the locking member and the protruding portion on the shell, so that the blocking member is loosened, and the high-pressure gas in the storage cavity can be discharged from the first through hole, which can effectively improve the safety of the battery. Specifically, the battery can not only be discharged, but also improve the pass rate of the battery drop test. Further, the electrical device with the battery has good safety.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0024] Figure 1 A schematic view of the battery of the first embodiment of the present application;

[0025] Figure 2 A schematic view of the battery of the second embodiment of the present application;

[0026] Figure 3A schematic view of the blocking member and the locking member in the battery of some embodiments of the present application;

[0027] Figure 4 A schematic view of the locking member in the battery of some embodiments of the present application.

[0028] Reference Signs:

[0029] Battery 10, housing 100, storage cavity 110, first through hole 120, inner surface 130, outer surface 140, blocking member 200, body part 210, second through hole 220, protruding part 230, first sealing member 300, first part 310, second part 320, second sealing member 400, third through hole 410, pressing member 500, locking member 600, metal member 610, adhesive layer 620. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below with reference to examples thereof illustrated in the accompanying drawings, wherein the same or like reference numerals represent the same or like elements throughout the several views. The embodiments described below are exemplary only, and are not to be taken in a limiting sense, but are merely for the purpose of explanation of the present application.

[0031] In the description of the present application, it is to be understood that the relative or positional relationship indicated by the orientation description, such as upper, lower, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0034] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0035] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the present application is not limited thereto.

[0036] The battery generally includes a cell. The cell includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0037] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0038] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0039] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating treatment on the surface, stainless steel with silver plating treatment on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be adopted. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0040] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04(also referred to as LFP for short)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(also referred to as NCM333 for short), LiNi 0.5 Co 0.2 Mn 0.3 O2(also referred to as NCM523 for short), LiNi 0.5 Co 0.25 Mn 0.25 O2(also referred to as NCM211 for short), LiNi 0.6 Co 0.2 Mn 0.2 O2(also referred to as NCM622 for short), LiNi 0.8 Co 0.1 Mn 0.1 O2(also referred to as NCM811 for short), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0041] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is used as the positive electrode, the surface of the foamed metal can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, potassium metal, or sodium metal, the lithium source material being lithium metal and / or a lithium-rich material.

[0042] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0043] As an example, the negative current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel, or titanium, etc. can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0044] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0045] As an example, the negative current collector has two surfaces opposite in a thickness direction thereof, and the negative active material is disposed on any one or both of the two opposite surfaces of the negative current collector.

[0046] As an example, the negative active material can employ a negative active material for a battery known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery can also be used. These negative active materials can be used alone or in combination of two or more.

[0047] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0048] In some embodiments, the battery cell further includes a separator disposed between the positive electrode and the negative electrode.

[0049] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0050] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0051] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and to separate the positive electrode and the negative electrode.

[0052] In some embodiments, the battery further includes an electrolyte that functions to conduct ions between the positive electrode and the negative electrode. The electrolyte can be liquid, gel, or solid. In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0053] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium bis-oxalate borate, lithium difluoro bis-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0054] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyrosulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0055] In some embodiments, the gel electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0056] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0057] As an example, the polymer solid-state electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0058] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0059] As an example, the composite solid-state electrolyte is formed by adding inorganic solid-state electrolyte fillers in a polymer solid-state electrolyte.

[0060] In some embodiments, the battery cell is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0061] In some embodiments, the battery cell is in a stack structure.

[0062] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0063] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments which are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0064] As an example, the positive electrode sheet and the negative electrode sheet are both folded to form a plurality of folded segments which are stacked.

[0065] As an example, a plurality of separators can be provided, and each of the plurality of separators is arranged between any adjacent positive electrode sheet or negative electrode sheet.

[0066] As an example, the separators can be continuously provided, and the separators are arranged between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0067] In some embodiments, the battery cell can have a cylindrical shape, a flat shape, or a polygonal shape.

[0068] In some embodiments, the battery cell can be provided with a tab. The tab can lead current out of the battery cell. The tab can include a positive tab and a negative tab.

[0069] In some embodiments, the battery can include a housing. The housing can be used to encapsulate the battery cell and other components such as electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0070] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or a battery having another shape. The prismatic battery can include, but is not limited to, a square battery, a blade battery, and a polygonal battery such as a hexagonal battery.

[0071] The battery as referred to in the embodiments of the present application refers to a single physical module including one or more batteries to provide higher voltage and capacity.

[0072] In some embodiments, the battery can be a battery module. When there are multiple batteries, the multiple batteries are arranged and fixed to form a battery module.

[0073] In some embodiments, the battery can be a battery pack. The battery pack can include a box and a battery. The battery or the battery module is accommodated in the box.

[0074] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can become at least part of a floor of the vehicle, or portions of the box can become at least part of cross members and longitudinal members of the vehicle.

[0075] Embodiments of the present application provide a power consumption device using a battery as a power source. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0076] In the related art, the battery may, under excessive charging and discharging, in a high-temperature environment, when the battery is mechanically damaged, or when the battery is internally short-circuited, have a risk of thermal runaway, which may, in turn, cause the battery to explode. In order to effectively avoid the battery from exploding, a relief valve can be provided to quickly discharge high-temperature and high-pressure gas when the battery is in thermal runaway.

[0077] The existing battery relief method is to engrave a groove on the shell. When the battery is in thermal runaway, the shell at the groove is thin and has low mechanical strength, which can facilitate the gas to break through the shell and thus relieve pressure. However, such a method can reduce the pass rate of the battery in drop tests. Therefore, the present application provides a battery.

[0078] Please refer to Figures 1 to 4In some embodiments, the battery 10 comprises a housing 100, a battery cell (not shown), a blocking member 200, and a locking member 600. The housing 100 has a storage cavity 110 and a first through hole 120, and the storage cavity 110 and the first through hole 120 are in communication. The shape of the housing 100 is not limited, for example, the shape of the housing 100 can be a cube, a long body, or a cylinder. The shape of the first through hole 120 is not limited, for example, the shape of the first through hole 120 can be a square, a rectangle, or a circle. The housing 100 comprises an inner surface 130 and an outer surface 140, and the inner surface 130 of the housing 100 forms the storage cavity 110. The battery cell is arranged in the storage cavity 110. The structure of the battery cell belongs to the prior art, and will not be described here. The blocking member 200 comprises a body portion 210 and a protruding portion 230, the protruding portion 230 is connected to the body portion 210 and protrudes relative to the body portion 210. The protruding portion 230 can protrude radially relative to the body portion 210, that is, the cross section of the blocking member 200 can be in the shape of a "7" or a "T". The body portion 210 is arranged in the first through hole 120, thereby closing the first through hole 120, which can effectively improve the sealing performance of the battery 10. The locking member 600 is arranged in the storage cavity 110 and connected to the body portion 210. The locking member 600 and the protruding portion 230 are clamped to the inner surface 130 and the outer surface 140 of the housing 100, respectively, to generate a pre-tightening force on the inner surface 130 and the outer surface 140 of the housing 100. The locking member 600 is configured to melt when the temperature of the battery cell reaches a threshold value, so as to eliminate the pre-tightening force and release the pressure in the storage cavity 110 through the first through hole 120. Specifically, the body portion 210 of the blocking member 200 is arranged in the first through hole 120, and the locking member 600 and the protruding portion 230 are clamped to the inner surface 130 and the outer surface 140 of the housing 100, respectively, to generate a pre-tightening force on the inner surface 130 and the outer surface 140 of the housing 100. In this way, no notches are arranged on the housing 100, and the housing 100 will not be easily damaged due to low mechanical strength during the drop test of the battery 10. Moreover, since the locking member 600 and the protruding portion 230 exert a pre-tightening force on the housing 100, the body portion 210 can stably block the first through hole 120, thereby improving the pass rate of the drop test of the battery 10. Furthermore, when the battery cell is in thermal runaway, the high temperature and high pressure in the storage cavity 110 can cause the locking member 600 to melt, thereby eliminating the pre-tightening force of the locking member 600 and the protruding portion 230 on the housing 100, so that the blocking member 200 is loosened, and the high-pressure gas in the storage cavity 110 can be released from the first through hole 120, thereby effectively improving the safety of the battery 10. Specifically, the battery 10 not only can release pressure, but also can improve the pass rate of the drop test of the battery 10.

[0079] It is to be explained that the locking member 600 and the protrusion 230 are clamped to the inner surface 130 and the outer surface 140 of the shell 100 respectively to generate a pre-tightening force on the inner surface 130 and the outer surface 140 of the shell 100. Specifically, after the locking member 600 and the blocking member 200 are installed on the shell 100, the locking member 600 and the blocking member 200 generate a pre-tightening force on the shell 100 in a pre-tightening manner, so as to tightly clamp the shell 100, which can effectively ensure the reliability of the sealing. Correspondingly, when the locking member 600 melts, the pre-tightening force disappears, and the blocking member 200 loosens, which can effectively ensure the gas leakage. It is to be further explained that the threshold temperature of the battery cell refers to the temperature when the battery cell is in thermal runaway, which can be, for example, 95°C or above, at which time the locking member 600 melts. The melting of the locking member 600 can be that the locking member 600 melts entirely or that the locking member 600 melts partially.

[0080] Further, please refer to Figures 1 to 4 In some embodiments, the body part 210 is provided with a second through hole 220, and the locking member 600 is arranged in the second through hole 220. After the locking member 600 is arranged in the second through hole 220, the middle position of the locking member 600 is located in the second through hole 220, and the two ends of the locking member 600 can abut against the shell 100 respectively, so that the locking member 600 and the blocking member 200 can clamp the shell 100.

[0081] Further, please refer to Figures 1 to 4 In some embodiments, the battery 10 further comprises a first sealing member 300. The material of the first sealing member 300 can be silicone or rubber. The first sealing member 300 comprises a first part 310 and a second part 320, the first part 310 is connected to the second part 320, and the first part 310 protrudes relative to the second part 320. The cross-sectional shape of the first sealing member 300 can be T-shaped. The shapes of the first part 310 and the second part 320 can be circular, and the diameter of the first part 310 is smaller than the diameter of the second part 320. The first part 310 is arranged in the first through hole 120, and the two sides of the first sealing member 300 abut against the blocking member 200 and the shell 100 respectively. Specifically, the two sides of the first part 310 can abut against the body part 210 and the hole wall of the first through hole 120 respectively, and the two sides of the second part 320 can abut against the protrusion 230 and the outer surface 140 of the shell 100 respectively. The blocking member 200 can be made of metal, and the shell 100 can also be made of metal, so that after the first sealing member 300 is arranged on the shell 100 and the blocking member 200, the sealing performance of the battery 10 can be improved. In addition, when the first sealing member 300 is made of rubber, the first sealing member 300 itself has a certain elasticity, and after the locking member 600 and the blocking member 200 are connected, the elasticity of the first sealing member 300 can be converted into a pre-tightening force on the shell 100.

[0082] Further, the first seal 300 mentioned above can be located between the outer surface 140 of the shell 100 and the blocking member 200, and a second seal 400 can also be arranged between the inner surface 130 of the shell 100 and the locking member 600. Specifically, please refer to Figures 1 to 4 In some embodiments, the battery 10 further comprises a second seal 400. The second seal 400 can be made of silicone or rubber. The second seal 400 is arranged in the storage cavity 110, and the second seal 400 is provided with a third through hole 410, and the first part 310 is arranged in the third through hole 410, and the two sides of the second seal 400 abut against the shell 100 and the locking member 600 respectively. The first part 310 arranged in the third through hole 410 specifically means that the length of the first part 310 is greater than the depth of the first through hole 120, so that after the first part 310 is located in the first through hole 120, the first part 310 can also protrude out of the first through hole 120. The second seal 400 is sleeved on the periphery of the first part 310, so as to further form a seal. The two sides of the second seal 400 abutting against the shell 100 and the locking member 600 respectively can be that the second seal 400 can be sheet-shaped or block-shaped, one side of the second seal 400 abutting against the cavity wall of the storage cavity 110 (the inner surface 130 of the shell 100), and the other side of the second seal 400 indirectly or directly abutting against the locking member 600. The locking member 600 has high strength before melting, and the second seal 400 itself has a certain elasticity. After the locking member 600 and the blocking member 200 are connected, the locking member 600 can make the second seal 400 shrink, and the elasticity of the second seal 400 can be converted into a pre-tightening force on the shell 100.

[0083] Further, the locking member 600 mentioned above can abut against the second seal 400. In some cases, the material of the second seal 400 is relatively soft, which will not be convenient for pressing the second seal 400 down, and therefore a pressing member 500 with high hardness can be used to press the second seal 400. Specifically, please refer to Figures 1 to 4 In some embodiments, the battery 10 further comprises a pressing member 500, and the pressing member 500 is made of metal and is located between the locking member 600 and the second seal 400. In this way, the pressing member 500 can press the second seal 400 down as a whole, so that the second seal 400 is in a shrunk state, and the locking member 600 and the blocking member 200 can conveniently clamp the shell 100 together.

[0084] Further, in some embodiments, the distance from the protrusion 230 to the locking member 600 along the thickness direction of the pressing member 500 is T1, the size of the second portion 320 is H1, the thickness of the cavity wall of the storage cavity 110 is H2, the size of the second sealing member 400 is H3, and the size of the pressing member 500 is H4. T1 < H1 + H2 + H3 + H4. Specifically, the first sealing member 300, the second sealing member 400, and the pressing member 500 can be arranged between the locking member 600 and the blocking member 200. When T1 ≥ H1 + H2 + H3 + H4, the pre-tightening effect of the blocking member 200 and the locking member 600 on the shell 100 can be poor, and thus the sealing performance of the battery 10 can be poor, and the battery 10 can have the risk of liquid leakage.

[0085] Further, in some embodiments, when the locking member 600 and the protrusion 230 are clamped to the inner surface 130 and the outer surface 140 of the shell 100 respectively, the size of the second portion 320 along the thickness direction of the second portion 320 is A1, and the size of the second sealing member 400 is B1. That is, when the locking member 600 and the protrusion 230 are clamped to the inner surface 130 and the outer surface 140 of the shell 100 respectively, the locking member 600 and the protrusion 230 can exert a pre-tightening force on the shell 100, and the pre-tightening force can be generated by compressing the first sealing member 300 and the second sealing member 400. Thus, the first sealing member 300 and the second sealing member 400 can be compressed under the action of an external force. At this time, the size of the second portion 320 is A1, and the size of the second sealing member 400 is B1. When the locking member 600 releases the pre-tightening force, the size of the second portion 320 is A2, and the size of the second sealing member 400 is B2. After the pre-tightening force is released, the first sealing member 300 and the second sealing member 400 return to their original states, and thus the size of the second portion 320 is A2, and the size of the second sealing member 400 is B2. Further, in order to effectively ensure that the sealing performance of the battery 10 is good, the size relationship between A1, B1, A2, and B2 is 50% (A2 + B2) ≤ A1 + B1 ≤ 80% (A2 + B2). Specifically, if the maximum value of A1 + B1 is greater than 80% (A2 + B2), the compression amount of the first sealing member 300 and the second sealing member 400 can be insufficient, and the locking member 600 and the blocking member 200 can not effectively clamp the shell 100. If the maximum value of A1 + B1 is less than 50% (A2 + B2), in order to make the compression amount of the first sealing member 300 and the second sealing member 400 reach this value, not only the compression difficulty can be increased, but also the first sealing member 300 and the second sealing member 400 can be damaged by the excessive compression pressure.

[0086] Further, the specific structure of the locking member 600 will be described below. Please refer to Figure 4In some embodiments, the locking member 600 comprises a metal member 610 and a glue layer 620, and the glue layer 620 is wrapped on the metal member 610. The metal member 610 can be iron or stainless steel. The glue layer 620 can be PP glue. The PP glue has a low melting point, and can melt when the battery cell is in thermal runaway, so as to eliminate the pre-tightening force. In addition, in addition to the above structure, the locking member 600 can also be made of low-melting-point PP glue, or the locking member 600 comprises a hard plastic and a glue layer 620, and the low-melting-point glue layer 620 is wrapped on the hard plastic.

[0087] Further, in some embodiments, the battery cell comprises a tab, and the blocking member 200 is electrically connected with the tab. The blocking member 200 can be made of metal, so that after the blocking member 200 is electrically connected with the tab, the current of the battery cell can be conducted to the outside. The tab can be a positive tab or a negative tab. In some cases, the battery cell comprises a positive tab and a negative tab. The negative tab can be electrically connected with the shell 100, and the positive tab can be electrically connected with the blocking member 200, and the blocking member 200 is insulated from the shell 100 by the first sealing member 300. In addition, the blocking member 200 can also be electrically connected with the tab in the following manner: the tab is welded with the pressing member 500, and the pressing member 500 is in abutment with the blocking member 200 to be electrically connected with the blocking member 200.

[0088] In some embodiments, the electrical device comprises the battery 10 of any one of the above embodiments. Specifically, the body portion 210 of the blocking member 200 is arranged in the first through hole 120, and the locking member 600 and the protruding portion 230 are clamped to the inner surface 130 and the outer surface 140 of the shell 100, respectively, to generate a pre-tightening force on the inner surface 130 and the outer surface 140 of the shell 100. In this way, the shell 100 is not provided with a notch, and the shell 100 will not be easily damaged due to low mechanical strength during the drop test of the battery 10. Moreover, since the locking member 600 and the protruding portion 230 exert a pre-tightening force on the shell 100, the body portion 210 can stably block the first through hole 120. Further, when the battery cell is in thermal runaway, the high temperature and high pressure in the storage cavity 110 can cause the locking member 600 to melt, which can eliminate the pre-tightening force of the locking member 600 and the protruding portion 230 on the shell 100, so as to loosen the blocking member 200, and the high-pressure gas in the storage cavity 110 can be discharged from the first through hole 120, which can effectively improve the safety of the battery 10. Specifically, the battery 10 not only can be discharged, but also can improve the pass rate of the drop test of the battery 10. Further, the electrical device with the battery 10 has good safety.

[0089] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. Furthermore, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized by, The battery comprises: a shell having a storage cavity and a first through hole, the storage cavity and the first through hole being communicated; a battery cell arranged in the storage cavity; a blocking member comprising a body portion and a protruding portion, the protruding portion being connected to the body portion and protruding relative to the body portion, the body portion being arranged in the first through hole; a locking member arranged in the storage cavity, the locking member being connected to the body portion, the locking member and the protruding portion being clamped to the inner surface and the outer surface of the shell respectively to generate a pre-tightening force on the inner surface and the outer surface of the shell, wherein the locking member is configured to melt when the temperature of the battery cell reaches a threshold value to eliminate the pre-tightening force, and the pressure of the storage cavity is released through the first through hole; the body portion is provided with a second through hole, and the locking member is arranged in the second through hole; the locking member comprises a metal member and a glue layer, and the glue layer wraps the metal member; the battery cell comprises a tab, and the blocking member and the tab are electrically connected; the metal member is iron or stainless steel, and the glue layer is a low-melting-point glue layer.

2. The battery of claim 1, wherein, The battery further comprises a first sealing member comprising a first portion and a second portion, the first portion being connected to the second portion and protruding relative to the second portion, the first portion being arranged in the first through hole, and the two sides of the first sealing member abutting against the blocking member and the shell respectively.

3. The battery of claim 2, wherein, The battery further comprises a second sealing member arranged in the storage cavity, the second sealing member being provided with a third through hole, the first portion being arranged in the third through hole, and the two sides of the second sealing member abutting against the shell and the locking member respectively.

4. The battery of claim 3, wherein, The battery further comprises a pressing member made of metal, the pressing member being located between the locking member and the second sealing member.

5. The battery of claim 4, wherein, In the thickness direction of the pressing member, the distance from the protruding portion to the locking member is T1, the size of the second portion is H1, the thickness of the cavity wall of the storage cavity is H2, the size of the second sealing member is H3, and the size of the pressing member is H4, and T1 6. The battery of claim 3, wherein, When the locking member and the protruding portion are clamped to the inner surface and the outer surface of the shell respectively, in the thickness direction of the second portion, the size of the second portion is A1, and the size of the second sealing member is B1, when the locking member releases the pre-tightening force, the size of the second portion is A2, the size of the second sealing member is B2, and 50% (A2+B2) ≤ A1+B1 ≤ 80% (A2+B2).

7. An electrical device, characterized by The battery comprises the battery as claimed in any one of claims 1 to 6. The battery comprises the battery as claimed in any one of claims 1 to 6.

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