Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, the battery includes: a housing having a storage cavity and a first through hole, the first through hole being communicated with the storage cavity; the connecting piece is provided with a second through hole, the connecting piece is connected to the shell, and the first through hole is communicated with the second through hole; the battery cell is arranged in the storage cavity; the pressure relief piece is arranged in the second through hole, and the pressure relief piece can be fused when the temperature of the battery cell reaches a threshold value, so that the pressure in the storage cavity is relieved through the second through hole. The battery provided by the utility model can have relatively high safety.

Description

TECHNICAL FIELD

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

[0002] In the related art, the battery includes a cell and a shell, the shell has a storage cavity, and the cell is arranged in the storage cavity. When the cell inside the battery is short-circuited, overcharged, over-discharged, or the external environment temperature is too high, the cell may cause thermal runaway due to heat accumulation, which may cause the battery to explode further, and the safety of the battery is low. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery, which can have high safety.

[0004] The utility model further provides an electrical equipment.

[0005] According to the battery of the first aspect of the utility model embodiment, comprising:

[0006] The shell has a storage cavity and a first through hole, and the first through hole and the storage cavity are communicated;

[0007] The connecting piece is provided with a second through hole, the connecting piece is connected to the shell, and the first through hole and the second through hole are communicated;

[0008] The cell is arranged in the storage cavity;

[0009] The pressure relief piece is arranged in the second through hole, and the pressure relief piece can melt when the temperature of the cell reaches a threshold value, so that the pressure in the storage cavity is relieved through the second through hole.

[0010] According to the battery of the utility model embodiment, at least has following beneficial effect: the cell is arranged in the storage cavity, the first through hole and the storage cavity are communicated, wherein the pressure relief piece is arranged in the second through hole communicated with the first through hole, when the battery thermal runaway occurs, the temperature of the cell will rise, and the pressure relief piece will melt when the temperature of the cell reaches a threshold value, which can make the second through hole blocked by the pressure relief piece be opened, so that the air pressure in the storage cavity can be relieved from the second through hole, so that the battery can effectively avoid the problem of explosion due to thermal runaway. Specifically, the battery can have high safety.

[0011] According to some embodiments of the utility model, the second through hole and the pressure relief piece are provided with a plurality of each, and each pressure relief piece is arranged in one second through hole.

[0012] According to the battery of some embodiments of the present application, the area of the second through hole is S1, the area of the connecting piece is S2, and 0.1≤S1 / S2≤0.6.

[0013] According to the battery of some embodiments of the present application, the pressure relief piece comprises a first piece and a second piece, a plurality of second through holes are provided, the first piece is arranged in a part of the second through holes, the second piece is arranged in another part of the second through holes, and the melting point of the first piece is greater than the melting point of the second piece.

[0014] According to the battery of some embodiments of the present application, the melting point of the pressure relief piece is T, and 110℃≤T≤130℃.

[0015] According to the battery of some embodiments of the present application, one end of the pressure relief piece, which is opposite to the shell, is flush with one end of the connecting piece, which is opposite to the shell.

[0016] According to the battery of some embodiments of the present application, the battery further comprises a pole, the pole is connected to the shell, the pole, the connecting piece and the pressure relief piece are located on the same side of the shell, the protruding size of the pole relative to the shell is A, the protruding size of the connecting piece relative to the shell is B, and 0≤B≤A.

[0017] According to the battery of some embodiments of the present application, the connecting piece comprises a first part and a second part, the second part surrounds an edge connected to the first part, the first part is provided with the second through hole, and the second part is connected to the shell.

[0018] According to the battery of some embodiments of the present application, the second part is welded or bonded to the shell.

[0019] According to the power equipment of the second aspect of the embodiments of the present application, the battery is the battery of any one of the first aspect of the embodiments.

[0020] According to the power equipment of the embodiments of the present application, the battery is arranged in the storage cavity, the first through hole and the storage cavity are communicated, the pressure relief piece is arranged in the second through hole communicated with the first through hole, when the battery is in thermal runaway, the temperature of the battery core is increased, the pressure relief piece is melted when the temperature of the battery core reaches a threshold value, which can open the second through hole blocked by the pressure relief piece, so that the pressure in the storage cavity can be relieved from the second through hole, and thus the battery can effectively avoid the problem of explosion due to thermal runaway. Specifically, the battery can have high safety. Further, the power equipment with the battery also has high safety.

[0021] The additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0023] Figure 1 is a schematic view of the battery of the first embodiment of the present application;

[0024] Figure 2 is Figure 1 is an enlarged schematic view of the portion A in the middle;

[0025] Figure 3 is a schematic view of the battery of the second embodiment of the present application;

[0026] Figure 4 is Figure 3 is an enlarged schematic view of the portion B in the middle;

[0027] Figure 5 is a schematic view of the battery of the third embodiment of the present application.

[0028] REFERENCE NUMERALS:

[0029] Battery 10, housing 100, first through hole 110, connecting piece 200, second through hole 210, pressure relief piece 300, third through hole 400, pole 410. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it is 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, 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.

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

[0033] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0034] In the description of the utility model, the description of 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 utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can 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. The present application embodiment is not limited thereto.

[0036] The battery generally includes a cell. The cell includes a positive electrode, a negative electrode and a separator. In the process of charging and discharging the battery, active ions (such as lithium ions) are inserted 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 can also allow the active ions to pass through.

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

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

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

[0040] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one kind, or two or more kinds 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 material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material 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 a modified compound thereof, and the like.

[0041] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is used as the positive electrode, the foamed metal surface can be free of positive electrode active material, or can be provided with positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal. The lithium source material can be lithium metal and / or lithium-rich material.

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

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

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

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

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

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

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

[0049] In some embodiments, the separator is a separator film. The separator film can be any porous structure separator film known to have good chemical stability and mechanical stability.

[0050] For example, the separator film can be made of 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 layers can be the same or different. The separator can be a separate component between the positive and negative electrodes or can be attached to the surface of the positive and negative electrodes.

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

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

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

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

[0055] The gel electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0056] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0057] 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, a cellulose, or the like.

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

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

[0060] In some embodiments, the electric core is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0061] In some embodiments, the electric core is in a stack structure.

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

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

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

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

[0066] As an example, the isolation pieces can be continuously provided, and each isolation piece is arranged between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0067] In some embodiments, the electric core can be in a cylindrical shape, a flat shape, or a multi-prism shape, or the like.

[0068] In some embodiments, the electric core can be provided with a tab. The tab can guide current out of the electric core. The tab can include a positive tab and a negative tab.

[0069] In some embodiments, the battery can include a housing. The housing can be used to encapsulate the electric core and other components such as the 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, or the like.

[0070] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or other shaped battery, and the prismatic battery includes, but is not limited to, a square battery, a blade battery, a multi-prismatic battery, for example, a hexagonal battery, etc.

[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 can be a battery module, and when there are multiple batteries, the multiple batteries are arranged and fixed to form a battery module.

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

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

[0075] The embodiments of the present application provide a power consumption device using a battery as a power source, and 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 vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0076] In the related art, the battery includes a battery cell and a shell, and the shell has a storage cavity, and the battery cell is arranged in the storage cavity. When the battery cell inside the battery is short-circuited, overcharged, over-discharged, or the external environment temperature is too high, the battery cell may cause thermal runaway due to heat accumulation, which may cause the battery to further explode, and the safety of the battery is low. Therefore, the present application provides a battery.

[0077] Please refer to Figures 1 to 5In some embodiments, the battery 10 comprises a shell 100, a connecting piece 200, a battery cell and a pressure relief piece 300. The shell 100 has a storage cavity and a first through hole 110, and the first through hole 110 is in communication with the storage cavity. The shape of the shell 100 is not limited, for example, the shape of the shell 100 can be a cube, a cuboid or a cylinder. The material of the shell 100 can be metal. The first through hole 110 can be used for pressure relief, that is, the gas in the storage cavity can be discharged through the first through hole 110. In addition, the first through hole 110 can also be used for injecting electrolyte. The connecting piece 200 is provided with a second through hole 210, and the connecting piece 200 is connected to the shell 100, and the first through hole 110 and the second through hole 210 are in communication. The shape of the connecting piece 200 is not limited, for example, the shape of the connecting piece 200 can be sheet-shaped or block-shaped. The battery cell is arranged in the storage cavity. The pressure relief piece 300 is arranged in the second through hole 210, and the pressure relief piece 300 is arranged in the second through hole 210, that is, the pressure relief piece 300 is filled in the second through hole 210, and when the battery 10 does not need to be relieved, the pressure relief piece 300 fills the second through hole 210, which can effectively ensure that the battery 10 has good air tightness. The pressure relief piece 300 can melt when the temperature of the battery cell reaches a threshold value, so that the pressure in the storage cavity is relieved through the second through hole 210. Specifically, the battery cell is arranged in the storage cavity, and the first through hole 110 is in communication with the storage cavity, wherein the pressure relief piece 300 is arranged in the second through hole 210 which is in communication with the first through hole 110. When the battery 10 occurs thermal runaway, the temperature of the battery cell will rise, and the pressure relief piece 300 will melt when the temperature of the battery cell reaches a threshold value, which can open the second through hole 210 blocked by the pressure relief piece 300, so that the gas pressure in the storage cavity can be relieved from the second through hole 210. In this way, the battery 10 can effectively avoid the problem of explosion due to thermal runaway. Specifically, the battery 10 can have high safety.

[0078] The pressure relief piece 300 can melt when the temperature of the battery cell reaches a threshold value, which means that the pressure relief piece 300 is in a solid state at room temperature, for example, the pressure relief piece 300 is in a solid state at 25℃, and the pressure relief piece 300 can be filled in the second through hole 210, which can improve the air tightness of the battery 10. The pressure relief piece 300 can melt at high temperature, for example, the pressure relief piece 300 will melt at 110℃, that is, when the temperature in the storage cavity is high, the pressure relief piece 300 melts, and the gas in the storage cavity will be discharged from the second through hole 210. The temperature of the battery cell reaching a threshold value means the temperature of the battery cell when thermal runaway occurs. That is, when the battery cell does not have thermal runaway phenomenon, the temperature of the battery cell is lower than 100℃ (herein only 100℃ is taken as an example), at this time, the temperature of the battery cell does not reach a threshold value.

[0079] The material of the pressure relief piece 300 can be PP glue, hot melt glue or PE glue, which can fill the second through hole 210 at room temperature and melt at high temperature, thereby facilitating the discharge of gas.

[0080] It needs to be further explained that, in the prior art, some batteries 10 usually have a groove on the shell 100 in order to release pressure to improve safety. That is, by thinning a part of the shell 100, when the internal pressure of the shell 100 is large due to thermal runaway, the pressure will break through the groove, causing the shell 100 to break open, thereby releasing pressure. Among them, after the battery 10 is manufactured, drop test needs to be performed, after the groove is engraved on the shell 100, the shell 100 will be damaged due to low mechanical strength, and cannot pass the drop test, which will reduce the yield of the battery 10. The battery 10 of the present application does not need to engrave a groove on the shell 100, so the mechanical strength of the battery 10 can be improved.

[0081] Further, please refer to Figure 3 and Figure 4 In some embodiments, the second through hole 210 and the pressure relief member 300 are each provided with a plurality of, and each pressure relief member 300 is arranged in one second through hole 210. Specifically, the second through hole 210 can be provided with five, ten, fifteen or twenty, etc., and similarly, the pressure relief member 300 can also be provided with five, ten, fifteen or twenty, etc. Among them, the arrangement of multiple second through holes 210 can improve the pressure relief rate, thereby facilitating the rapid discharge of gas in the storage cavity.

[0082] Further, in some embodiments, the area of the second through hole 210 is S1, the area of the connecting member 200 is S2, and 0.1≤S1 / S2≤0.6. Among them, the area of the second through hole 210 is S1 specifically refers to the total area of the second through hole 210, that is, when the second through hole 210 is one, the area of the second through hole 210 is S1. When the second through hole 210 is five, S1 refers to the sum of the areas of the five second through holes 210. Among them, S1 / S2 can be equal to 0.1, 0.2, 0.3 or 0.6, wherein when S1 / S2 is less than 0.1, the area of the second through hole 210 is small, and the area of the connecting member 200 is large. The small area of the second through hole 210 may lead to poor pressure relief effect of the battery 10, and waste of the material of the connecting member 200. When S1 / S2 is greater than 0.6, the area of the second through hole 210 is large, and the area of the connecting member 200 is small. When the area of the second through hole 210 is large, the area of the pressure relief member 300 that needs to be filled is also large. When the area of the pressure relief member 300 is large, the speed of the pressure relief member 300 melting at the first time may be slow, which will cause the battery 10 to be unable to release pressure at the first time.

[0083] Further, in some embodiments, the pressure relief member 300 comprises a first member and a second member. The second through hole 210 is provided with a plurality of second through holes 210, the first member is arranged in a portion of the second through holes 210, and the second member is arranged in another portion of the second through holes 210. The melting point of the first member is greater than the melting point of the second member. Specifically, the melting points of the first member and the second member are different. Since the melting point of the first member is less than the melting point of the second member, the battery 10 can achieve pressure relief at different temperatures. For example, when the temperature is low, the first member melts, and the second member does not melt. When the temperature is high, the first member and the second member melt. This can achieve pressure relief of the battery 10 on the one hand, and can also make the battery 10 have high airtightness on the other hand.

[0084] Further, in some embodiments, the melting point of the pressure relief member 300 is T, and 110℃≤T≤130℃. The melting point of the pressure relief member 300 is 110℃, 115℃, 120℃, or 130℃. When the melting point of the pressure relief member 300 is less than 110℃, the melting point of the pressure relief member 300 is low, which can cause the pressure relief member 300 to melt easily. When the battery 10 does not have thermal runaway, melting of the pressure relief member 300 can cause the battery 10 to have poor airtightness. When the melting point of the pressure relief member 300 is greater than 130℃, since the melting point of the pressure relief member 300 is high, the pressure relief member 300 is difficult to melt, which can cause the battery 10 to be unable to relieve pressure at the first time of thermal runaway, and the safety of the battery 10 is low.

[0085] Further, please refer to Figure 1 and Figure 2 In some embodiments, the end of the pressure relief member 300 opposite to the shell 100 is flush with the end of the connecting member 200 opposite to the shell 100. That is, after the pressure relief member 300 is arranged in the second through hole 210, the pressure relief member 300 does not protrude out of the second through hole 210, and does not recess in the second through hole 210, so that the end of the pressure relief member 300 opposite to the shell 100 is flush with the end of the connecting member 200 opposite to the shell 100. If the pressure relief member 300 protrudes out of the second through hole 210, the pressure relief member 300 can increase the size of the shell 100. For example, when the pressure relief member 300 and the connecting member 200 are arranged on one side of the shell 100 in the length direction, the pressure relief member 300 protruding out of the second through hole 210 can cause the shell 100 to have a large size in the length direction, and the energy density of the battery 10 is low. If the pressure relief member 300 recesses in the second through hole 210, the volume of the pressure relief member 300 can be small, which can cause the battery 10 to have poor airtightness.

[0086] Further, please refer to Figure 5In some embodiments, the battery 10 further comprises a pole 410 connected to the shell 100. The pole 410, the connecting piece 200 and the pressure relief piece 300 are located on the same side of the shell 100, the pole 410 protrudes from the shell 100 by a size A, the connecting piece 200 protrudes from the shell 100 by a size B, and 0≤B≤A. Specifically, after the pole 410 is connected to the shell 100, the battery cell can realize current conduction with the outside through the pole 410. When the pole 410 is connected to the shell 100, the pole 410 will protrude from the surface of the shell 100. Similarly, after the connecting piece 200 is connected to the shell 100, the connecting piece 200 will also protrude from the surface of the shell 100. If B is greater than A, it may cause the connecting piece 200 to protrude too much, thereby reducing the energy density of the battery 10. The pole 410 is connected to the shell 100, which can be that the shell 100 is provided with a third through hole 400, and the pole 410 is arranged in the third through hole 400.

[0087] Further, the specific structure of the connecting piece 200 is introduced below. In some embodiments, the connecting piece 200 comprises a first part and a second part, the second part surrounds the edge connected to the first part, the first part is provided with a second through hole 210, and the second part is connected to the shell 100. Specifically, the second part is not provided with the second through hole 210, which can facilitate the connection of the second part and the shell 100, thereby realizing the connection of the connecting piece 200 on the shell 100. Among them, the manufacturing process of the battery 10 can be to connect the pressure relief piece 300 and the connecting piece 200, that is, to put the pressure relief piece 300 into the second through hole 210, and then connect the connecting piece 200 on the shell 100, which can improve the manufacturing efficiency of the battery 10.

[0088] Further, in some embodiments, the second part is welded to the shell 100. Among them, the connecting piece 200 can be a metal material, after the second part is welded to the shell 100, the welding method can improve the connection strength of the connecting piece 200 and the shell 100, in addition, the welding method can also make the connecting piece 200 and the shell 100 have high airtightness, thereby the reliability of the battery 10 is higher. In addition, the second part can also be bonded to the shell 100, which can facilitate operation and improve manufacturing efficiency.

[0089] In some embodiments, the power-using device comprises the battery 10 of any one of the above embodiments. The battery cell is arranged in the storage cavity, and the first through hole 110 and the storage cavity are in communication, wherein the pressure relief member 300 is arranged in the second through hole 210 in communication with the first through hole 110, when the battery 10 occurs thermal runaway, the temperature of the battery cell will rise, and the pressure relief member 300 will melt when the temperature of the battery cell reaches a threshold value, which can make the second through hole 210 blocked by the pressure relief member 300 be opened, so that the air pressure in the storage cavity can be relieved from the second through hole 210, thus the battery 10 can effectively avoid the problem of explosion due to thermal runaway. Specifically, the battery 10 can have higher safety. Further, the power-using device with the battery 10 also has higher safety.

[0090] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above 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 housing having a storage cavity and a first through hole, the first through hole being in communication with the storage cavity; a connecting piece provided with a second through hole, the connecting piece being connected to the housing, the first through hole being in communication with the second through hole; an electric core arranged in the storage cavity; a pressure relief piece arranged in the second through hole, the pressure relief piece being capable of melting when the temperature of the electric core reaches a threshold value, so as to release the pressure in the storage cavity through the second through hole; the second through hole and the pressure relief piece are both provided with a plurality of, each of the pressure relief pieces being arranged in one of the second through holes.

2. The battery of claim 1, wherein, The area of the second through hole is S1, the area of the connecting piece is S2, and 0.1≤S1 / S2≤0.

6.

3. The battery of claim 1, wherein, The pressure relief piece comprises a first piece and a second piece, the second through hole is provided with a plurality of, the first piece is arranged in a part of the second through hole, the second piece is arranged in another part of the second through hole, and the melting point of the first piece is greater than the melting point of the second piece.

4. The battery of claim 1, wherein, The melting point of the pressure relief piece is T, and 110℃≤T≤130℃.

5. The battery of claim 1, wherein, The end of the pressure relief piece away from the housing is flush with the end of the connecting piece away from the housing.

6. The battery of claim 5, wherein, The battery further comprises a pole, the pole being connected to the housing, the pole, the connecting piece and the pressure relief piece being located on the same side of the housing, the protruding size of the pole relative to the housing is A, the protruding size of the connecting piece relative to the housing is B, and 0≤B≤A.

7. The battery of claim 1, wherein, The connecting piece comprises a first part and a second part, the second part surrounds the edge connected to the first part, the first part is provided with the second through hole, and the second part is connected to the housing.

8. The battery of claim 7, wherein, The second part is welded or bonded to the housing.

9. An electrical device, characterized by The battery comprises the battery as claimed in any one of claims 1 to 8.

Images