Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. The battery comprises a plugging piece and a battery cover, the shell is provided with a storage cavity and a first through hole, and the storage cavity is communicated with the first through hole; the glue layer is arranged between the plugging piece and the shell, the two sides of the glue layer are bonded to the plugging piece and the shell respectively, and the plugging piece seals the first through hole; the expansion piece is arranged between the plugging piece and the shell, the two sides of the expansion piece are connected to the plugging piece and the shell respectively, and the expansion piece is configured in the mode that when the expansion piece is heated to expand, the expansion force of the expansion piece is larger than the bonding force of the adhesive layer. The battery provided by the utility model can effectively and quickly release pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field especially is related to a battery and electrical equipment. BACKGROUND

[0002] In the related art, when the battery encounters internal short circuit, overcharge, overdischarge, external impact or high temperature, etc., a large amount of heat and gas may be generated inside the battery, thereby causing explosion. In order to effectively avoid the problem of battery explosion, an explosion-proof valve can be provided, specifically, when the pressure inside the battery is too large, the explosion-proof valve can discharge the gas inside the battery, thereby effectively avoiding battery explosion.

[0003] Further, the specific way of pressure relief of the existing battery is that a pressure relief hole is provided on the shell, and the metal piece closes the pressure relief hole by being adhered to the shell. When the pressure inside the battery is too large, the temperature inside the battery is high, which will cause the adhesive to fail, thereby opening the pressure relief hole for pressure relief. However, the adhesive still has a high adhesive force when it melts, which will cause the metal piece to still block the pressure relief hole, and the gas inside the battery cannot be discharged as soon as possible. SUMMARY

[0004] The utility model aims at least to solve one of the technical problems existing in the prior art. To this end, the utility model provides a battery which can effectively and quickly relieve pressure.

[0005] The utility model further provides an electrical equipment.

[0006] The battery according to the first aspect of the utility model comprises:

[0007] a blocking piece;

[0008] a shell provided with a storage cavity and a first through hole, the storage cavity and the first through hole being communicated;

[0009] a glue layer provided between the blocking piece and the shell, two sides of the glue layer being adhered to the blocking piece and the shell respectively, and the blocking piece closing the first through hole;

[0010] an expansion piece provided between the blocking piece and the shell, two sides of the expansion piece being connected to the blocking piece and the shell respectively, and the expansion piece being configured to have an expansion force greater than the adhesive force of the glue layer when the expansion piece is heated and expanded.

[0011] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0012] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0013] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0014] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0015] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0016] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0017] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0018] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0019] The battery has at least the following beneficial effects: the glue layer is arranged between the blocking member and the shell, the glue layer can fix the blocking member on the shell, thereby realizing that the blocking member closes the first through hole, when the pressure inside the battery becomes large, because the expansion member is located between the shell and the blocking member, and the expansion member expands when heated, the expansion force of the expansion member is greater than the adhesion of the glue layer, therefore, the expansion member can disconnect the connection between the blocking member and the shell under the condition of being heated, thereby the pressure inside the shell can be discharged as soon as possible.

[0020] According to the battery of some embodiments of the utility model, the shell includes metal piece and main body, the main body is provided with the storage cavity and the first through -hole, the metal piece is provided with fourth through -hole, the fourth through -hole with the first through -hole intercommunication, one side of the metal piece is welded to the main body, the other side of the metal piece is connected to the adhesive layer, along the thickness direction of the metal piece, the projection area of the metal piece is D1, the projection area of the plugging piece is D2, D1>D2.

[0021] According to the battery of some embodiments of the utility model, the battery further includes pole and electric core, the electric core is arranged in the storage cavity, the pole is insulatedly connected to the shell, and the pole and the electric core are electrically connected, the plugging piece and the pole are located on the same side of the shell, the height of the pole protruding relative to the shell is L1, the height of the plugging piece protruding relative to the shell is L2, L2≤L1.

[0022] According to the battery of some embodiments of the utility model, the battery further includes pole and electric core, the electric core is arranged in the storage cavity, the pole is insulatedly connected to the shell, and the pole and the electric core are electrically connected, the plugging piece and the pole are located on the same side of the shell, the height of the pole protruding relative to the shell is L1, the height of the plugging piece protruding relative to the shell is L2, L2≤L1.

[0023] According to the battery of some embodiments of the utility model, the battery further includes pole and electric core, the electric core is arranged in the storage cavity, the pole is insulatedly connected to the shell, and the pole and the electric core are electrically connected, the plugging piece and the pole are located on the same side of the shell, the height of the pole protruding relative to the shell is L1, the height of the plugging piece protruding relative to the shell is L2, L2≤L1.

[0024] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be further explained below in combination with the drawings and embodiments, wherein:

[0026] Figure 1 It is the partial schematic view of the battery of the first embodiment of the utility model;

[0027] Figure 2 It is the partial explosion schematic view of the battery of some embodiments of the utility model;

[0028] Figure 3 It is the partial schematic view of the battery of the second embodiment of the utility model;

[0029] Figure 4 FIG. 3 is a partial view of a battery according to a third embodiment of the present application;

[0030] Figure 5 FIG. 4 is a schematic view of a battery according to some embodiments of the present application.

[0031] Reference Signs:

[0032] Plugging member 100, shell 200, first through hole 210, metal piece 220, fourth through hole 221, main body 230, adhesive layer 300, second through hole 310, expansion piece 400, third through hole 410, pole 500. DETAILED DESCRIPTION

[0033] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0034] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0035] In the description of the present application, 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, etc. are understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0036] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.

[0037] In the description of the present utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present utility model. In the specification, the illustrative 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 one or more embodiments or examples in a suitable manner.

[0038] 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., and the present application embodiment is not limited thereto.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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, 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.).

[0043] 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 (which can also be referred to simply as LFP)), 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 (which can also be referred to simply as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof, etc.

[0044] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, etc. When the foam metal is used as the positive electrode, the surface of the foam metal can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0045] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0046] As an example, the negative current collector can employ a metal foil, a foamed metal, or a composite current collector. As the metal foil, for example, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel, or titanium, or the like can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or the like. 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, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0047] 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.

[0048] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0049] 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, lithium titanate, and the like. 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.

[0050] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0051] In some embodiments, the battery cell further includes a separator disposed between the positive electrode and the negative electrode.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 difluoroboric oxalate, lithium bisoxalate borate, lithium difluorophosphoric oxalate, and lithium tetrafluorophosphoric oxalate.

[0057] 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.

[0058] In some embodiments, the gel electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0059] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, or a composite solid-state electrolyte.

[0060] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, or the like.

[0061] 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.

[0062] As an example, the composite solid-state electrolyte is formed by adding inorganic solid-state electrolyte fillers in a polymer solid-state electrolyte.

[0063] In some embodiments, the battery cell is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0064] In some embodiments, the battery cell is in a stack structure.

[0065] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided respectively and are alternately stacked.

[0066] 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.

[0067] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments which are stacked.

[0068] As an example, a plurality of separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0069] As an example, the separators can be continuously provided and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0070] In some embodiments, the battery cell can have a cylindrical shape, a flat shape, or a polygonal shape.

[0071] In some embodiments, the battery cell can be provided with tabs. The tabs can conduct current out of the battery cell. The tabs include positive tabs and negative tabs.

[0072] In some embodiments, the battery can include a housing. The housing is 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, etc.

[0073] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or a battery of other shapes. The prismatic battery includes, but is not limited to, a square battery, a blade battery, and a polygonal battery, such as a hexagonal battery, etc.

[0074] The battery 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.

[0075] 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.

[0076] In some embodiments, the battery can be a battery pack. The battery pack includes a box and a battery. The battery or the battery module is accommodated in the box.

[0077] 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.

[0078] 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.

[0079] In the related art, when the battery encounters internal short circuit, overcharge, overdischarge, external impact, high temperature, etc., a large amount of heat and gas can be generated inside the battery, which can cause explosion. In order to effectively avoid the problem of battery explosion, an explosion-proof valve can be provided. Specifically, when the pressure inside the battery is too large, the explosion-proof valve can discharge the gas inside the battery, thereby effectively avoiding battery explosion.

[0080] Further, the specific way of existing battery pressure relief is that a pressure relief hole is provided on the shell, and a metal piece closes the pressure relief hole by being bonded to the shell. When the pressure inside the battery is too large, the temperature inside the battery is high, which can cause the adhesive to fail, thereby opening the pressure relief hole for pressure relief. However, the adhesive still has a high bonding force when it melts, which can cause the metal piece to still block the pressure relief hole, and the gas inside the battery cannot be discharged as soon as possible. Therefore, the present application provides a battery.

[0081] Please refer to Figures 1 to 3In some embodiments, the battery comprises: an electric core, a blocking piece 100, a shell 200, a glue layer 300 and an expansion piece 400. The shell 200 is provided with a storage cavity and a first through hole 210, and the storage cavity and the first through hole 210 are communicated. The shape of the shell 200 can be rectangular, square, cylindrical or triangular, and the shape of the shell 200 is not limited. The shell 200 can be connected with the negative electrode of the electric core, thereby being electrified. The first through hole 210 can be used to inject electrolyte into the storage cavity in addition to being used to release pressure. The glue layer 300 is arranged between the blocking piece 100 and the shell 200, and the two sides of the glue layer 300 are respectively bonded to the blocking piece 100 and the shell 200. The blocking piece 100 closes the first through hole 210. That is, the glue layer 300 can seal the first through hole 210 by bonding. In addition, when the internal pressure of the battery is too large and the heat is large, the glue layer 300 melts under the heat, the adhesion decreases, and the blocking piece 100 cannot block the first through hole 210, which can make the gas in the storage cavity escape.

[0082] The expansion piece 400 is arranged between the blocking piece 100 and the shell 200, and the two sides of the expansion piece 400 are respectively connected to the blocking piece 100 and the shell 200. The expansion piece 400 is configured such that when the expansion piece 400 expands under heat, the expansion force of the expansion piece 400 is greater than the bonding force of the glue layer 300. Specifically, the glue layer 300 is arranged between the blocking piece 100 and the shell 200, and the glue layer 300 can fix the blocking piece 100 on the shell 200, thereby realizing that the blocking piece 100 closes the first through hole 210. When the internal pressure of the battery becomes large, because the expansion piece 400 is located between the shell 200 and the blocking piece 100, and the expansion force of the expansion piece 400 is greater than the bonding force of the glue layer 300 when the expansion piece 400 expands under heat, the expansion piece 400 can disconnect the connection between the blocking piece 100 and the shell 200 under heat by the expansion force of the expansion piece 400, thereby enabling the internal pressure of the shell 200 to be discharged as soon as possible. Specifically, the battery can effectively and quickly release pressure.

[0083] Further, in the present application, the connection between the blocking piece 100 and the shell 200 by the glue layer 300 can achieve the effect of pressure relief. However, because the glue layer 300 still has adhesion when it melts under heat, the blocking piece 100 and the shell 200 will still be somewhat adhered, and the first through hole 210 cannot be completely opened in the first time to discharge gas. After the expansion piece 400 is further arranged, the expansion force of the expansion piece 400 after being heated is greater than the bonding force, and the expansion piece 400 can accelerate the opening of the first through hole 210, thereby achieving quick pressure relief.

[0084] The material of the expansion member 400 can be a thermal expansion microsphere foaming agent, which is a small spherical particle capable of volume expansion within a specific temperature range. It is usually composed of a thermoplastic polymer shell and an internal encapsulated low-boiling hydrocarbon compound. This unique structure enables the microsphere to expand when heated. The thermal expansion microsphere foaming agent can include polyvinyl alcohol (PVA) microspheres, polystyrene (PS) microspheres, polyacrylate (PA) microspheres, etc.

[0085] The material of the adhesive layer 300 can be a hot melt adhesive, which can quickly plasticize and solidify after heating, making it very suitable for situations that require rapid assembly. In the battery manufacturing process, the use of hot melt adhesive can greatly shorten the production cycle and improve production efficiency.

[0086] Further, the shapes of the first through-hole 210, the adhesive layer 300, and the blocking member 100 are not specifically limited, such as rectangular, square, circular, oblong, or irregular polygonal shapes, etc.

[0087] Further, the adhesive layer 300 is arranged between the shell 200 and the blocking member 100 in various ways, such as covering the first through-hole 210, and then the two sides of the adhesive layer 300 are bonded to the shell 200 and the blocking member 100, respectively; or the adhesive layer 300 is provided with a second through-hole 310, the second through-hole 310 and the first through-hole 210 are communicated, and the adhesive layer 300 is distributed on the edge of the first through-hole 210. Specifically, please refer to Figures 1 to 3 In some embodiments, the adhesive layer 300 is provided with a second through-hole 310, and the first through-hole 210 and the second through-hole 310 are communicated. Wherein, the way of communication between the first through-hole 210 and the second through-hole 310 can accelerate the separation of the shell 200 and the blocking member 100. Specifically, when the temperature inside the shell 200 increases, the temperature of the shell 200 rises, and then the shell 200 conducts to the side of the adhesive layer 300 facing away from the blocking member 100, the adhesion between the shell 200 and the adhesive layer 300 becomes weak, and the high-temperature gas also enters the second through-hole 310 through the first through-hole 210, so that the blocking member 100 is heated, and the adhesion between the blocking member 100 and the adhesive layer 300 becomes weak. In this way, the blocking member 100 can be quickly separated from the shell 200, realizing the rapid pressure relief of the battery.

[0088] Further, please refer to Figures 1 to 3In some embodiments, the expansion member 400 is provided with a third through hole 410, and the adhesive layer 300 is arranged in the third through hole 410. In the manufacturing process of the battery, the solidified adhesive layer 300 is arranged between the blocking member 100 and the shell 200, and then the blocking member 100 and the shell 200 are subjected to hot pressing to melt the adhesive layer 300, so that the blocking member 100 and the shell 200 are bonded. Then, the expansion member 400 is arranged in the gap between the shell 200 and the blocking member 100, and the expansion member 400 is arranged around the edge of the adhesive layer 300. In this way, the battery can be conveniently manufactured, and the manufacturing efficiency of the battery can be effectively improved. If the expansion member 400 is arranged between the shell 200 and the blocking member 100 first in the manufacturing process of the battery, the expansion member 400 may

[0089] Further, in some embodiments, the adhesive layer 300 includes a first adhesive layer and a second adhesive layer, the side of the first adhesive layer opposite to the second adhesive layer is bonded to the shell 200, the side of the second adhesive layer opposite to the first adhesive layer is bonded to the blocking member 100, and the melting point of the first adhesive layer is lower than that of the second adhesive layer. Specifically, the melting point of the first adhesive layer is lower than that of the second adhesive layer, and when the temperature inside the shell 200 is high, the first adhesive layer is quickly melted after being heated, and the bonding force between the first adhesive layer and the shell 200 is reduced. The melting point of the second adhesive layer is higher than that of the first adhesive layer, and the second adhesive layer can continue to be bonded to the blocking member 100 after being heated. In this way, when the battery is out of control, the adhesive layer 300 can be bonded to the blocking member 100 and fall off from the shell 200 together with the blocking member 100, which can effectively improve the pressure relief efficiency.

[0090] Further, in some embodiments, the area of the first through hole 210 is S1, the area of the adhesive layer 300 is S2, the area of the expansion member 400 is S3, and 0.1≤(S2+S3):S1≤10. (S2+S3):S1 can be equal to 0.1, 0.5, 1, 2, 5, or 10. Specifically, if the ratio of the sum of the area of the adhesive layer 300 and the area of the expansion member 400 to the area of the first through hole 210 is less than 0.1, there are two cases, one case is that the area of the first through hole 210 is too small, which can result in a low pressure relief efficiency, and the other case is that the sum of the area of the adhesive layer 300 and the area of the expansion member 400 is too large, which can result in a waste of the adhesive layer 300 and the expansion member 400 materials, and a slow pressure relief efficiency due to the large adhesive force of the adhesive layer 300. If the ratio of the sum of the area of the adhesive layer 300 and the area of the expansion member 400 to the area of the first through hole 210 is greater than 10, there are two cases, one case is that the area of the first through hole 210 is too small, which can result in a low pressure relief efficiency, and the other case is that the sum of the area of the adhesive layer 300 and the area of the expansion member 400 is too large, which can result in a waste of the adhesive layer 300 and the expansion member 400 materials, and a slow pressure relief efficiency due to the large adhesive force of the adhesive layer 300. Specifically, refer to Table 1 below.

[0091] Table 1

[0092] S1 S2 S3 (S2 + S3): S1 Pressure relief efficiency Example 1 4.5 7.78 1.54 2 Normal Example 2 4.5 0.8 8 2 Normal Example 3 4.5 8.5 0.85 2 Normal Example 4 12.5 0.625 0.625 0.1 Normal Example 5 2.25 5.68 5.68 5.05 Normal Example 6 1.26 6.3 6.3 10 Normal Comparative Example 1 1.13 6.9 5.8 11 Slower Comparative Example 2 12.8 0.383 0.65 0.08 Slower

[0093] As can be seen from Table 1, when S1, S2, and S3 do not satisfy 0.1≤(S2+S3):S1≤10, the area of the first through hole 210 is too small, which can result in a low pressure relief efficiency, and the sum of the area of the adhesive layer 300 and the area of the expansion member 400 is too large, which can result in a waste of the adhesive layer 300 and the expansion member 400 materials, and a slow pressure relief efficiency due to the large adhesive force of the adhesive layer 300, and vice versa.

[0094] Further, in some embodiments, the area of the glue layer 300 is S2, the area of the expansion piece 400 is S3, and 0.1≤S2:S3≤10. Specifically, S2:S3 can be equal to 0.1, 0.5, 1, 2, 5, or 10. If the ratio of the area of the glue layer 300 and the area of the expansion piece 400 is less than 0.1, there are two cases, one is that the area of the glue layer 300 is too small, and the other is that the area of the expansion piece 400 is too large, both of which will result in poor bonding effect. If the ratio of the area of the glue layer 300 and the area of the expansion piece 400 is greater than 10, there are two cases, one is that the area of the glue layer 300 is too large, and the other is that the area of the expansion piece 400 is too small, both of which will result in insufficient expansion of the expansion piece 400, slow pressure relief efficiency, and high bonding strength.

[0095] Further, in some embodiments, the expansion temperature of the expansion piece 400 is T1, the melting point of the glue layer 300 is T2, and T2-T1≥5℃. Specifically, the temperature difference between the expansion temperature of the expansion piece 400 and the melting point of the glue layer 300 can be 5℃, 6℃, 8℃, or 10℃. That is, when the temperature inside the shell 200 is high and the battery cell is in thermal runaway, the high temperature will first cause the expansion piece 400 to start to expand, and then the glue layer 300 to start to melt. The expansion piece 400 first expands, and the expansion piece 400 will respectively give the shell 200 and the blocking piece 100 a pushing force, thereby pushing the blocking piece 100 away from the shell 200, and then the glue layer 300 starts to melt, the bonding force between the blocking piece 100 and the shell 200 decreases, and the expansion piece 400 can more easily separate the shell 200 and the blocking piece 100, thereby achieving fast pressure relief of the battery. For details, refer to Table 2 below.

[0096] Table 2

[0097] T1 T2 T2 - T1 Pressure relief efficiency Example 1 95 100 5 Normal Example 2 102.5 115 12.5 Faster Example 3 110 130 20 Faster Comparative Example 1 110 100 -10 Slower

[0098] From Table 2, it can be seen that when T1 and T2 satisfy T2-T1≥5℃, the temperature inside the shell 200 is high, and the battery cell is in thermal runaway, the high temperature will first cause the expansion piece 400 to start to expand, and then the glue layer 300 to start to melt. The expansion piece 400 first expands, and the expansion piece 400 will respectively give the shell 200 and the blocking piece 100 a pushing force, thereby pushing the blocking piece 100 away from the shell 200, and then the glue layer 300 starts to melt, the bonding force between the blocking piece 100 and the shell 200 decreases, and the expansion piece 400 can more easily separate the shell 200 and the blocking piece 100, thereby achieving fast pressure relief of the battery. When the glue layer 300 melts, the expansion piece 400 has not yet expanded, which will result in slow pressure relief.

[0099] Further, in some embodiments, the expansion temperature of the expansion member 400 is T1, 95℃≤T1≤110℃. The expansion temperature of the expansion member 400 can be 95℃, 98℃, 100℃ or 110℃. When the expansion temperature of the expansion member 400 is less than 95℃, the expansion member 400 expands prematurely when the battery cell does not reach thermal runaway, and the expansion member 400 acts on the shell 200 and the blocking member 100, affecting the adhesion of the adhesive layer 300, resulting in low sealing reliability of the battery. When the expansion temperature of the expansion member 400 is greater than 110℃, the expansion member 400 does not function when the adhesive layer 300 melts, which reduces the pressure relief speed and sensitivity, and cannot make the battery relieve pressure as soon as possible.

[0100] Further, in some embodiments, the melting point of the adhesive layer 300 is T2, 100℃≤T2≤130℃. The melting point of the adhesive layer 300 can be 100℃, 110℃, 120℃ or 130℃. When the melting point of the adhesive layer 300 is less than 100℃, the adhesive layer 300 can melt when the battery cell does not reach thermal runaway, which can result in low sealing reliability of the battery; when the melting point of the adhesive layer 300 is greater than 130℃, the melting point of the adhesive layer 300 is too high, and the adhesive layer 300 is difficult to melt when the battery cell reaches thermal runaway, which cannot make the shell 200 and the blocking member 100 separate as soon as possible, and the battery relieve pressure.

[0101] Further, please refer to Figures 1 to 4 In some embodiments, the shell 200 includes a metal member 220 and a main body 230, the main body 230 is provided with a storage cavity and a first through hole 210, the metal member 220 is provided with a fourth through hole 221, the fourth through hole 221 and the first through hole 210 are in communication, one side of the metal member 220 is welded to the main body 230, and the other side of the metal member 220 is connected to the adhesive layer 300. In the thickness direction of the metal member 220, the projection area of the metal member 220 is D1, and the projection area of the blocking member 100 is D2, D1>D2. Specifically, in order to improve the manufacturing efficiency of the battery, the metal member 220, the adhesive layer 300, the expansion member 400 and the blocking member 100 can be assembled, and then the metal member 220 is welded on the main body 230. That is, when manufacturing the battery, the adhesive layer 300 can be placed between the metal member 220 and the blocking member 100, and then heat-pressed to make the adhesive layer 300 adhere to the expansion member 400 and the metal member 220, and then the expansion member 400 is arranged between the metal member 220 and the expansion member 400, and finally the metal member 220 is welded on the main body 230. When D1<D2, the area of the blocking member 100 is too large, which affects the welding of the metal member 220 and the main body 230. For details, please refer to Table 3 below.

[0102] Table 3

[0103] D1 D2 Structural reliability Example 1 3.2 2.1 Reliable Comparative Example 1 2 3 Unreliable

[0104] As can be seen from Table 3, the plugging member 100 is too large in area, which affects the welding of the metal member 220 and the main body 230, the structure cannot be realized, and the reliability is low.

[0105] Further, referring to Figure 5 In some embodiments, the battery further comprises a pole 500, the pole 500 is electrically connected with the battery cell, the pole 500 is insulatedly connected to the shell 200, and the sum of the thicknesses of the metal member 220, the adhesive layer 300 and the plugging member 100 is less than the length of the pole 500. That is, the battery cell is arranged in the storage cavity, the pole 500 is insulatedly connected to the shell, the pole 500 is electrically connected with the battery cell, and the plugging member 100 and the pole are located on the same side of the shell 200. The height of the pole 500 protruding relative to the shell 200 is L1, the height of the plugging member 100 protruding relative to the shell 200 (the plugging member 100 protrudes relative to the shell 200, that is, the sum of the thicknesses of the metal member 220, the adhesive layer 300 and the plugging member 100) is L2, and L2≤L1. Specifically, if the sum of the thicknesses of the metal member 220, the adhesive layer 300 and the plugging member 100 is greater than the length of the pole, the energy density of the battery can be reduced. In addition, if the sum of the thicknesses of the metal member 220, the adhesive layer 300 and the plugging member 100 is too large, the plugging member 100 can be in contact with the box during the heat box test of the battery, thereby conducting heat, which can cause the adhesive layer 300 to melt, reduce the bonding performance, and affect the sealing performance of the battery.

[0106] Further, in some embodiments, the electrical device comprises the battery of any one of the above embodiments. Specifically, the adhesive layer 300 is arranged between the plugging member 100 and the shell 200, and the adhesive layer 300 can fix the plugging member 100 on the shell 200, thereby realizing that the plugging member 100 closes the first through hole 210. When the pressure inside the battery becomes large, since the expansion member 400 is located between the shell 200 and the plugging member 100, and the expansion member 400 expands under heat, the expansion force of the expansion member 400 is greater than the bonding force of the adhesive layer 300, so that the expansion member 400 can disconnect the connection between the plugging member 100 and the shell 200 under heat by the expansion force of the expansion member 400, thereby enabling the pressure inside the shell 200 to be discharged as soon as possible. Specifically, the battery can effectively and quickly release pressure. Further, the safety of the electrical device with the battery is high.

[0107] The embodiments of the utility model are described in detail above combined with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized by, The battery comprises: a blocking piece; a shell provided with a storage cavity and a first through hole, the storage cavity and the first through hole being communicated; a glue layer arranged between the blocking piece and the shell, two sides of the glue layer being respectively bonded to the blocking piece and the shell, and the blocking piece closing the first through hole; an expansion piece arranged between the blocking piece and the shell, two sides of the expansion piece being respectively connected to the blocking piece and the shell, and the expansion piece being configured to have an expansion force greater than a bonding force of the glue layer when the expansion piece is heated and expanded.

2. The battery of claim 1, wherein, The glue layer is provided with a second through hole, and the first through hole and the second through hole are communicated.

3. The battery of claim 1, wherein, The expansion piece is provided with a third through hole, and the glue layer is arranged in the third through hole.

4. The battery of claim 1, wherein, The glue layer comprises a first glue layer and a second glue layer, one side of the first glue layer opposite to the second glue layer is bonded to the shell, one side of the second glue layer opposite to the first glue layer is bonded to the blocking piece, and a melting point of the first glue layer is less than a melting point of the second glue layer.

5. The battery of claim 1, wherein, An area of the first through hole is S1, an area of the glue layer is S2, and an area of the expansion piece is S3, and 0.1≤(S2+S3):S1≤10.

6. The battery of claim 1, wherein, An area of the glue layer is S2, and an area of the expansion piece is S3, and 0.1≤S2:S3≤10.

7. The battery of claim 1, wherein, An expansion temperature of the expansion piece is T1, and a melting point of the glue layer is T2, and T2-T1≥5℃.

8. The battery of claim 7, wherein, The expansion temperature of the expansion piece is T1, and 95℃≤T1≤110℃.

9. The battery of claim 7, wherein, The melting point of the glue layer is T2, and 100℃≤T2≤130℃.

10. The battery of claim 1, wherein, The shell comprises a metal piece and a main body, the main body is provided with the storage cavity and the first through hole, the metal piece is provided with a fourth through hole, the fourth through hole and the first through hole are communicated, one side of the metal piece is welded to the main body, the other side of the metal piece is connected to the glue layer, along a thickness direction of the metal piece, a projected area of the metal piece is D1, a projected area of the blocking piece is D2, and D1>D2.

11. The battery of claim 1, wherein, The battery further comprises a pole and a cell, the cell is arranged in the storage cavity, the pole is insulatively connected to the shell, the pole and the cell are electrically connected, the blocking piece and the pole are located on the same side of the shell, a height of the pole protruding relative to the shell is L1, a height of the blocking piece protruding relative to the shell is L2, and L2≤L1.

12. An electrical device, characterized by The battery comprises the battery as claimed in any one of claims 1 to 11. The battery comprises the battery as claimed in any one of claims 1 to 11.

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