Battery and electric equipment

Abstract

The invention discloses a battery and electric equipment, and the battery comprises a shell which is provided with a storage cavity and a first through hole, and the storage cavity is communicated with the first through hole; the battery cell is arranged in the storage cavity; the plugging 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, and the body part is arranged in the first through hole in a penetrating mode; the 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 correspondingly so as to generate pre-tightening force on the inner surface and the outer surface of the shell, and the locking piece is configured to be arranged in the mode that the locking piece is arranged on the inner surface and the outer surface of the shell. The locking piece can be fused when the temperature of the battery cell 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. According to the battery provided by the invention, not only can pressure release be carried out, but also the passing rate of a battery drop test can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and an electrical device. Background Art

[0002] In the related art, when the battery is overcharged or discharged, or in a high temperature environment, or when the battery is mechanically damaged, or when the battery is short-circuited, the battery may experience thermal runaway, which may lead to risks such as battery explosion. In order to effectively prevent the battery from exploding, a pressure relief valve can be provided to discharge the high-temperature and high-pressure gas as quickly as possible when the battery is in thermal runaway.

[0003] The existing method of battery pressure relief is to carve a groove on the shell. When the battery thermally runs away, the shell thickness at the groove is thinner and the mechanical strength is lower, which makes it easier for gas to break through the shell and release pressure. However, this method will reduce the pass rate of the battery in the drop test. Summary of the invention

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

[0005] The invention also provides an electrical device.

[0006] A battery according to a first aspect of the present invention comprises:

[0007] A housing having a storage cavity and a first through hole, wherein the storage cavity and the first through hole are in communication;

[0008] A battery cell, disposed in the storage cavity;

[0009] A blocking member, comprising a main body and a protruding portion, wherein the protruding portion is connected to the main body and protrudes relative to the main body, and the main body is penetrated through the first through hole;

[0010] A locking member is arranged in the storage cavity, the locking member is connected to the main body, the locking member and the protrusion are respectively clamped on the inner surface and the outer surface of the shell to generate a pre-tightening force on the inner surface and the outer surface of the shell, wherein the locking member is configured so that the locking member can 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 relieved through the first through hole.

[0011] The battery according to the embodiment of the present invention has at least the following beneficial effects: the main body of the plugging member is inserted into the first through hole, wherein the locking member and the protrusion are respectively clamped on the inner surface and the outer surface of the shell to generate a pre-tightening force on the inner surface and the outer surface of the shell, so that no groove is provided on the shell, and when the battery is dropped, the shell will not be easily damaged due to the low mechanical strength, and because the locking member and the protrusion apply a pre-tightening force to the shell, the main body can stably block the first through hole, and further, when the battery cell has thermal runaway, the high temperature and high pressure in the storage cavity will melt the locking member, which can eliminate the pre-tightening force of the locking member and the protrusion on the shell, thereby loosening the plugging member, and the high-pressure gas in the storage cavity can be depressurized from the first through hole, which can effectively improve the safety of the battery. Specifically, the battery can not only be depressurized, but also improve the pass rate of the battery drop test.

[0012] In the battery according to some embodiments of the present invention, the main body is provided with a second through hole, and the locking member is passed through the second through hole.

[0013] According to some embodiments of the present invention, the battery further includes a first seal, which includes 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 seal are respectively abutted against the sealing member and the shell.

[0014] According to some embodiments of the battery of the present invention, the battery also includes a second seal, which is arranged in the storage cavity, and the second seal is provided with a third through hole, the first part is arranged in the third through hole, and two sides of the second seal are respectively abutted against the shell and the locking member.

[0015] According to some embodiments of the present invention, the battery further comprises a pressing piece, which is made of metal and is located between the locking piece and the second sealing piece.

[0016] In the battery according to some embodiments of the present invention, along the thickness direction of the pressure piece, the distance from the protrusion to the locking piece 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, the size of the pressure piece is H4, and T1 is less than H1+H2+H3+H4.

[0017] According to some embodiments of the battery of the present invention, when the locking piece and the protrusion are clamped on the inner surface and the outer surface of the shell respectively, along the thickness direction of the second part, the size of the second part is A1, and the size of the second seal is B1; when the locking piece releases the pre-tightening force, the size of the second part is A2, and the size of the second seal is B2, 50% (A2+B2) ≤ A1+B1 ≤ 80% (A2+B2).

[0018] In the battery according to some embodiments of the present invention, the locking member includes a metal member and an adhesive layer, and the adhesive layer is wrapped around the metal member.

[0019] In the battery according to some embodiments of the present invention, the battery cell includes a tab, and the sealing member is electrically connected to the tab.

[0020] The electrical device according to the second aspect of the present invention comprises the battery described in any one of the first aspect of the present invention.

[0021] The electrical equipment according to the embodiment of the present invention has at least the following beneficial effects: the main body of the blocking member is inserted into the first through hole, wherein the locking member and the protrusion are respectively clamped on the inner surface and the outer surface of the shell to generate a pre-tightening force on the inner surface and the outer surface of the shell, so that no groove is set on the shell, and when the battery is dropped, the shell will not be easily damaged due to the low mechanical strength, and because the locking member and the protrusion apply a pre-tightening force to the shell, the main body can stably block the first through hole, and further, when the battery cell has thermal runaway, the high temperature and high pressure in the storage cavity will melt the locking member, which can eliminate the pre-tightening force of the locking member and the protrusion on the shell, thereby loosening the blocking member, and the high-pressure gas in the storage cavity can be depressurized from the first through hole, which can effectively improve the safety of the battery. Specifically, the battery can not only be depressurized, but also improve the pass rate of the battery drop test. Furthermore, the safety of the electrical equipment with the battery is better.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 is a schematic diagram of a battery according to a first embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of a battery according to a second embodiment of the present invention;

[0026] Figure 3Schematic diagram of a blocking member and a locking member in a battery according to some embodiments of the present invention;

[0027] Figure 4 Schematic diagram of a locking member in a battery according to some embodiments of the present invention.

[0028] Reference numerals:

[0029] Battery 10, shell 100, storage cavity 110, first through hole 120, inner surface 130, outer surface 140, blocking member 200, main body 210, second through hole 220, protrusion 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 invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships 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 should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0034] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[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 storage battery, etc., which is not limited in the embodiments of the present application.

[0036] A battery generally includes a cell. The cell includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

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

[0038] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

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

[0040] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), 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), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2)) and at least one of its modified compounds, etc.

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

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

[0043] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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 substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

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

[0045] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

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

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

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

[0049] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

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

[0051] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0052] In some embodiments, the battery further comprises an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte may be liquid, gel or solid. The liquid electrolyte comprises an electrolyte salt and a solvent.

[0053] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0054] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl 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, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0055] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0056] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

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

[0058] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0059] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0060] In some embodiments, the battery cell is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0061] In some embodiments, the battery cell has a stacked structure.

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

[0063] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

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

[0065] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0066] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

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

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

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

[0070] As an example, the battery may be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes. Prismatic batteries include but are not limited to square-shell batteries, blade-shaped batteries, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0071] The battery mentioned 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 may 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 may be a battery pack, which includes a case and batteries, wherein the batteries or battery modules are accommodated in the case.

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

[0075] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0076] In the related art, when the battery is overcharged or discharged, or in a high temperature environment, or when the battery is mechanically damaged, or when the battery is short-circuited, the battery may experience thermal runaway, which may lead to risks such as battery explosion. In order to effectively prevent the battery from exploding, a pressure relief valve can be provided to discharge the high-temperature and high-pressure gas as quickly as possible when the battery is in thermal runaway.

[0077] The existing method of battery pressure relief is to carve a groove on the shell. When the battery thermally runs away, the shell thickness at the groove is thinner and the mechanical strength is lower, which can facilitate the gas to break through the shell and release pressure. However, this method will reduce the pass rate of the battery in the drop test. To this end, the present application proposes a battery.

[0078] Please refer to Figures 1 to 4In some embodiments, the battery 10 includes: a shell 100, a battery cell (not shown), a blocking member 200 and a locking member 600. The shell 100 has a storage cavity 110 and a first through hole 120, and the storage cavity 110 and the first through hole 120 are connected. The shape of the shell 100 is not specifically limited, for example, the shape of the shell 100 can be a cube, an elongated body or a cylinder. The shape of the first through hole 120 is not specifically limited, for example, the shape of the first through hole 120 can be a square, a rectangle or a circle. The shell 100 includes an inner surface 130 and an outer surface 140, and the inner surface 130 of the shell 100 forms a 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 further described here. The blocking member 200 includes a main body 210 and a protrusion 230, and the protrusion 230 is connected to the main body 210 and protrudes relative to the main body 210. Specifically, the protrusion 230 protrudes relative to the main body 210, and the protrusion 230 protrudes radially relative to the main body 210. That is, the cross section of the blocking member 200 can be a "7" shape or a "T" shape. Among them, the main body 210 is penetrated through the first through hole 120, so as to close the first through hole 120, which can effectively improve the sealing of the battery 10. The locking member 600 is arranged in the storage cavity 110, and the locking member 600 is connected to the main body 210. The locking member 600 and the protrusion 230 are clamped on 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. Among them, the locking member 600 is configured so that the locking member 600 can 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 110 is released through the first through hole 120. Specifically, the main body 210 of the blocking member 200 is inserted into the first through hole 120, wherein the locking member 600 and the protrusion 230 are respectively clamped on the inner surface 130 and the outer surface 140 of the shell 100 to generate a pre-tightening force on the inner surface 130 and the outer surface 140 of the shell 100. In this way, no groove is provided on the shell 100, and when the battery 10 is dropped, the shell 100 will not be easily damaged due to the low mechanical strength, and the locking member 600 and the protrusion 230 exert a pre-tightening force on the shell 100. The pre-tightening force is added, so the main body 210 can stably block the first through hole 120, thereby improving the pass rate of the drop test of the battery 10. Further, when the battery cell has thermal runaway, the high temperature and high pressure in the storage cavity 110 will melt the locking member 600, which can eliminate the pre-tightening force of the locking member 600 and the protrusion 230 on the shell 100, thereby loosening the blocking member 200, and the high-pressure gas in the storage cavity 110 can be depressurized from the first through hole 120, which can effectively improve the safety of the battery 10. Specifically, the battery 10 can not only be depressurized, but also improve the pass rate of the drop test of the battery 10.

[0079] It is further explained that the locking member 600 and the protrusion 230 are respectively clamped on the inner surface 130 and the outer surface 140 of the shell 100 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 plugging member 200 are installed on the shell 100, the locking member 600 and the plugging member 200 will generate a pre-tightening force on the shell 100 by pre-tightening, thereby tightly clamping the shell 100, which can effectively ensure the reliability of the seal. Correspondingly, when the locking member 600 melts, the pre-tightening force will disappear, and the plugging member 200 will loosen, which can effectively ensure the gas leakage. It is further explained that the cell temperature reaches the threshold value, which refers to the temperature when the cell is thermally runaway, for example, it can be above 95°C, at which time the locking member 600 will melt. The melting of the locking member 600 can be the melting of the locking member 600 or the partial melting of the locking member 600.

[0080] For further information, please refer to Figures 1 to 4 In some embodiments, the body 210 is provided with a second through hole 220, and the locking member 600 is passed through the second through hole 220. After the locking member 600 passes through the second through hole 220, the middle position of the locking member 600 is located in the second through hole 220, and both ends of the locking member 600 can respectively abut against the housing 100, so that the locking member 600 and the blocking member 200 can clamp the housing 100.

[0081] For further information, please refer to Figures 1 to 4 In some embodiments, the battery 10 further includes a first seal 300. The material of the first seal 300 may be silicone or rubber. The first seal 300 includes a first portion 310 and a second portion 320, wherein the first portion 310 is connected to the second portion 320 and the first portion 310 protrudes relative to the second portion 320. The cross-sectional shape of the first seal 300 may be T-shaped. The shapes of the first portion 310 and the second portion 320 may be circular, and the diameter of the first portion 310 is smaller than the diameter of the second portion 320. The first portion 310 is disposed in the first through hole 120, and the two sides of the first seal 300 abut against the blocking member 200 and the housing 100, respectively. Specifically, the two sides of the first seal 300 abut against the blocking member 200 and the housing 100, respectively, may be that the two sides of the first portion 310 abut against the body portion 210 and the hole wall of the first through hole 120, and the two sides of the second portion 320 abut against the protruding portion 230 and the outer surface 140 of the housing 100, respectively. The blocking member 200 may be made of metal, and the housing 100 may also be made of metal. Thus, after the housing 100 and the blocking member 200 are provided with the first sealing member 300, 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. 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 housing 100.

[0082] Furthermore, the first sealing member 300 mentioned above can be located between the outer surface 140 of the housing 100 and the blocking member 200, and the second sealing member 400 can also be provided between the inner surface 130 of the housing 100 and the locking member 600. For details, please refer to Figures 1 to 4 In some embodiments, the battery 10 further includes a second seal 400. The material of the second seal 400 may be silicone or rubber. The second seal 400 is disposed in the storage cavity 110, and the second seal 400 is provided with a third through hole 410. The first part 310 is disposed in the third through hole 410, and the two sides of the second seal 400 are respectively abutted against the housing 100 and the locking member 600. The first part 310 is disposed in the third through hole 410, which 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 outside the first through hole 120. The second seal 400 is sleeved on the periphery of the first part 310 to further form a seal. The two sides of the second sealing member 400 are respectively in contact with the housing 100 and the locking member 600. Specifically, the second sealing member 400 may be in the form of a sheet or a block, one side of the second sealing member 400 is pressed against the cavity wall of the storage cavity 110 (the inner surface 130 of the housing 100), and the other side of the second sealing member 400 is directly or indirectly pressed against the locking member 600. The locking member 600 has a high strength before melting, and the second sealing member 400 itself has a certain elasticity. After the locking member 600 and the blocking member 200 are connected, the locking member 600 can shrink the second sealing member 400, and the elasticity of the second sealing member 400 can be converted into a pre-tightening force on the housing 100.

[0083] Furthermore, the locking member 600 mentioned above can abut against the second sealing member 400. In some cases, the material of the second sealing member 400 is relatively soft, which makes it inconvenient to press down the second sealing member 400. Therefore, the pressing member 500 with a higher hardness can be pressed on the second sealing member 400. For details, please refer to Figures 1 to 4 In some embodiments, the battery 10 further includes a pressing member 500, which is made of metal and is located between the locking member 600 and the second sealing member 400. In this way, the pressing member 500 can press down the second sealing member 400 as a whole, so that the second sealing member 400 is in a contracted state, which facilitates the locking member 600 and the blocking member 200 to clamp the housing 100 together.

[0084] Further, in some embodiments, along the thickness direction of the pressing member 500, the distance from the protrusion 230 to the locking member 600 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, the size of the pressing member 500 is H4, and T1

[0085] Further, in some embodiments, when the locking member 600 and the protrusion 230 are clamped on the inner surface 130 and the outer surface 140 of the housing 100, respectively, along the thickness direction of the second portion 320, the size of the second portion 320 is A1, and the size of the second seal 400 is B1. That is, when the locking member 600 and the protrusion 230 are clamped on the inner surface 130 and the outer surface 140 of the housing 100, respectively, the locking member 600 and the protrusion 230 will apply a preload force to the housing 100, wherein the preload force generated may be formed by compressing the first seal 300 and the second seal 400. Therefore, the first seal 300 and the second seal 400 will 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 seal 400 is B1. When the locking member 600 releases the preload force, the size of the second portion 320 is A2, and the size of the second seal 400 is B2. When there is no pre-tightening force, the first seal 300 and the second seal 400 return to their original state, so the size of the second part 320 is A2, and the size of the second seal 400 is B2. Further, in order to effectively ensure that the sealing of the battery 10 is good, the size relationship of 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), then this will cause the compression of the first seal 300 and the second seal 400 to be insufficient, and the locking member 600 and the blocking member 200 will not clamp the housing 100 well. If the maximum value of A1 + B1 is less than 50% (A2 + B2), in order to make the compression of the first seal 300 and the second seal 400 reach this value, this will not only increase the difficulty of compression, but also may cause the first seal 300 and the second seal 400 to be unable to withstand such a large pressure and be damaged.

[0086] Further, the specific structure of the locking member 600 is described below. Figure 4 ​In some embodiments, the locking member 600 includes a metal member 610 and a glue layer 620, and the glue layer 620 is wrapped around the metal member 610. The metal member 610 can be iron or stainless steel. The glue layer 620 can be PP glue. PP glue has a low melting point and can melt when the battery cell is thermally runaway, thereby eliminating the preload. 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 includes hard plastic and a glue layer 620, and the low-melting-point glue layer 620 is wrapped around the hard plastic.

[0087] Further, in some embodiments, the battery cell includes a tab, and the plugging member 200 is electrically connected to the tab. The plugging member 200 may be made of metal, so that after the plugging member 200 is electrically connected to the tab, the current of the battery cell can be conducted to the outside world. The tab may be a positive tab or a negative tab. In some cases, the battery cell includes a positive tab and a negative tab, the negative tab may be electrically connected to the housing 100, the positive tab may be electrically connected to the plugging member 200, and the plugging member 200 is insulated from the housing 100 by the first sealing member 300. In addition, the specific method of electrically connecting the plugging member 200 to the tab may also be that the tab and the pressing member 500 are welded, and the pressing member 500 and the plugging member 200 are electrically connected by abutting.

[0088] In some embodiments, the electrical device includes the battery 10 of any one of the above embodiments. Specifically, the main body 210 of the blocking member 200 is inserted into the first through hole 120, wherein the locking member 600 and the protrusion 230 are respectively clamped on the inner surface 130 and the outer surface 140 of the shell 100 to generate a pre-tightening force on the inner surface 130 and the outer surface 140 of the shell 100. In this way, there is no notch on the shell 100, and when the battery 10 is dropped, the shell 100 will not be easily damaged due to its low mechanical strength, and due to the locking member 600 and the protrusion 230, the shell 100 will not be easily damaged due to its low mechanical strength. 0 applies a pre-tightening force to the housing 100, so the main body 210 can stably block the first through hole 120. Further, when the battery cell has thermal runaway, the high temperature and high pressure in the storage cavity 110 will melt the locking piece 600, which can eliminate the pre-tightening force of the locking piece 600 and the protrusion 230 on the housing 100, thereby loosening the blocking piece 200, and the high-pressure gas in the storage cavity 110 can be depressurized from the first through hole 120, which can effectively improve the safety of the battery 10. Specifically, the battery 10 can not only be depressurized, but also improve the pass rate of the drop test of the battery 10. Further, the safety of the electrical equipment with the battery 10 is better.

[0089] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized in that include: A housing having a storage cavity and a first through hole, wherein the storage cavity and the first through hole are in communication; A battery cell, disposed in the storage cavity; A blocking member, comprising a main body and a protruding portion, wherein the protruding portion is connected to the main body and protrudes relative to the main body, and the main body is penetrated through the first through hole; A locking member is arranged in the storage cavity, the locking member is connected to the main body, the locking member and the protrusion are respectively clamped on the inner surface and the outer surface of the shell to generate a pre-tightening force on the inner surface and the outer surface of the shell, wherein the locking member is configured so that the locking member can 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 relieved through the first through hole.

2. The battery according to claim 1, characterized in that The main body is provided with a second through hole, and the locking member is passed through the second through hole.

3. The battery according to claim 1, characterized in that The battery also includes a first seal, which includes 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 seal are respectively abutted against the sealing member and the shell.

4. The battery according to claim 3, characterized in that The battery further includes a second seal, which is disposed in the storage cavity and has a third through hole. The first portion is disposed in the third through hole, and two sides of the second seal are respectively in contact with the shell and the locking member.

5. The battery according to claim 4, characterized in that The battery further comprises a pressing piece, which is made of metal and is located between the locking piece and the second sealing piece.

6. The battery according to claim 5, characterized in that Along the thickness direction of the pressing piece, the distance from the protrusion to the locking piece 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 piece is H3, the size of the pressing piece is H4, and T1<H1+H2+H3+H4.

7. The battery according to claim 4, characterized in that When the locking member and the protrusion are clamped on the inner surface and outer surface of the shell respectively, along the thickness direction of the second part, the size of the second part is A1, and the size of the second sealing member is B1. When the locking member releases the preload force, the size of the second part is A2, and the size of the second sealing member is B2. 50% (A2+B2) ≤ A1+B1 ≤ 80% (A2+B2).

8. The battery according to claim 1, characterized in that The locking piece includes a metal piece and an adhesive layer, and the adhesive layer is wrapped around the metal piece.

9. The battery according to claim 1, characterized in that The battery cell includes a tab, and the sealing member is electrically connected to the tab.

10. Electrical equipment, characterized in that: Comprising the battery as claimed in any one of claims 1 to 9.

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