CN112652858A - Battery module, battery assembly and electric motor car that delay thermal runaway - Google Patents
Battery module, battery assembly and electric motor car that delay thermal runaway Download PDFInfo
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- CN112652858A CN112652858A CN202110063872.2A CN202110063872A CN112652858A CN 112652858 A CN112652858 A CN 112652858A CN 202110063872 A CN202110063872 A CN 202110063872A CN 112652858 A CN112652858 A CN 112652858A
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- thermal runaway
- battery
- battery module
- insulating
- insulating plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/375—Vent means sensitive to or responsive to temperature
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Battery Mounting, Suspending (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to the technical field of thermal runaway of batteries, and discloses a battery module for delaying thermal runaway, a battery assembly and an electric vehicle. Wherein postpone battery module of thermal runaway includes: a cover body; the battery module comprises a plurality of battery monomers, and each battery monomer is provided with an explosion-proof valve; the insulating plate is attached to the end part of the cover body, and a wire harness is arranged right above the insulating plate; one end of the elastic piece is abutted against the insulating plate, and the other end of the elastic piece is arranged on the cover body; the part of the binding band is positioned right above each battery monomer and is right opposite to the explosion-proof valve, and at least one end part of the binding band is connected with the insulating plate; when the thermal runaway of the battery module does not occur, the binding belt is in a tightening state and is in a compression state; when thermal runaway of one battery monomer occurs, the explosion-proof valve rushes out the battery monomer, the binding band is broken, and the insulating plate cuts off the wire harness. The battery module delaying thermal runaway can delay the time of thermal runaway of other battery modules, and the safety of a battery assembly is improved.
Description
Technical Field
The invention relates to the technical field of thermal runaway of batteries, in particular to a battery module and a battery assembly for delaying thermal runaway.
Background
In the prior art, when thermal runaway occurs in one battery module, thermal runaway easily occurs in the adjacent battery module, so that the battery assembly explodes, and the safety of the battery assembly is reduced.
Disclosure of Invention
Based on the above, the invention aims to provide a battery module, a battery assembly and an electric vehicle for delaying thermal runaway, which can delay the time for thermal runaway of other battery modules, increase the escape time of a user, and improve the safety of the battery assembly.
In order to achieve the purpose, the invention adopts the following technical scheme:
a battery module that retards thermal runaway, comprising: a housing defining a receiving cavity therein; the battery module is arranged in the accommodating cavity and comprises a plurality of battery monomers, each battery monomer is provided with an explosion-proof valve, and the explosion-proof valves are configured to flush out the battery monomers when the gas pressure generated when the battery monomers are out of control due to thermal runaway is greater than the preset pressure; the insulating plate is attached to the end part of the cover body, and a wire harness is arranged right above the insulating plate; one end of the elastic piece is abutted against the insulating plate, and the other end of the elastic piece is fixedly arranged on the cover body; a binding band, wherein part of the binding band is positioned right above each battery cell and is opposite to the explosion-proof valve, and at least one end part of the binding band is connected with the insulating plate; when each battery cell of the battery module is not in thermal runaway, the straps are in a tensioned state, and the straps can pull the insulation plates to compress the elastic members so that the elastic members are in a compressed state; when one battery cell is out of control due to heat, the explosion-proof valve rushes out of the battery cell, the binding band is broken, and the elastic piece pushes the insulating plate to move towards the direction close to the wiring harness and cut off the wiring harness.
As a preferable scheme of the battery module for delaying thermal runaway, a guide groove is formed in the cover body, the insulating plate is arranged in the guide groove, and when the binding band is broken, the elastic member pushes the insulating plate to move along the guide groove so that at least part of the insulating plate extends out of the guide groove and the wire harness is cut off.
As a preferred scheme of the battery module for delaying thermal runaway, the insulating plate and the elastic member are both located outside the cover body and are both disposed at two opposite ends of the cover body, and the end of the binding band is connected with the insulating plate after sequentially passing through the inner wall of the cover body, the lower end of the cover body and the outer wall of the cover body.
As a preferable scheme of the battery module for delaying thermal runaway, the elastic member includes a plate spring, a lower end of the plate spring is connected to the cover body, and an upper end of the plate spring is abutted to the insulating plate.
As a preferable scheme of the battery module for delaying thermal runaway, the binding tape is at least one of a mica tape, a melamine tape, a polyurethane tape and a boron nitride tape.
As a preferable scheme of the battery module for delaying thermal runaway, one end of the insulating plate, which can cut off the wire harness, is a cut part, and the cross-sectional area of the cut part is gradually reduced in a direction away from the elastic member.
As a preferable scheme of the battery module for delaying thermal runaway, the insulating plate comprises a metal plate and an insulating layer, and the insulating layer is located on one side of the metal plate, which is away from the cover body.
As a preferred scheme of the battery module for delaying thermal runaway, the insulating layer comprises at least one of a mica layer, a melamine layer, a polyurethane layer and a boron nitride layer, and the insulating layer is bonded to the metal plate.
As an optimal selection scheme of battery module who delays thermal runaway, battery module that delays thermal runaway still includes first insulating part, first insulating part cover is established battery module's top, be equipped with a plurality of on the first insulating part and dodge the hole, every one can be followed to a free utmost point ear homoenergetic of battery dodge the hole and stretch out.
A battery assembly comprises the battery module for delaying thermal runaway.
An electric vehicle comprises a vehicle body and the battery module for delaying thermal runaway, wherein the battery module for delaying thermal runaway is arranged on the vehicle body.
The invention has the beneficial effects that: according to the battery module delaying thermal runaway, when one battery monomer is out of thermal runaway, the explosion-proof valve is flushed out, high-temperature and high-pressure gas generated by the thermal runaway of the battery monomer is exhausted along with the gas, the binding belt positioned above the explosion-proof valve can resist the impact of the gas, the impact of the gas on the battery module delaying thermal runaway is reduced, after the binding belt is broken, the insulating plate is popped out by the elastic piece and cuts off a wire harness, the total voltage of a battery assembly is reduced, the high-voltage arc discharge phenomenon caused by insulation failure generated among different battery modules is delayed, the time for thermal runaway of the other battery modules is delayed, the escape time of a user is prolonged, and the safety of the battery assembly is improved.
The battery assembly has the battery module for delaying thermal runaway, so that when one battery monomer is subjected to thermal runaway, the battery assembly has the characteristics of small impact force, delay of large-voltage arc discharge among different battery modules, delay of thermal runaway time of other battery modules and high safety.
The electric vehicle disclosed by the invention has the advantages that the impact force is small, the large-voltage arc discharge phenomenon among different battery modules is delayed, the time for thermal runaway of other battery modules is delayed and the safety is high due to the battery modules for delaying the thermal runaway.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic view of a cover, an elastic member, an insulating plate, a band, etc. of a battery module for delaying thermal runaway according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a plurality of battery cells, a first insulating member, and the like of a battery module for delaying thermal runaway according to an embodiment of the invention
Fig. 3 is a schematic diagram illustrating the disconnection of the tie of the battery module for delaying thermal runaway according to an embodiment of the present invention.
In the figure:
1. a cover body; 101. an accommodating chamber; 102. a guide groove; 11. flanging; 12. phase change convex; 2. a battery cell; 3. an insulating plate; 4. an elastic member; 5. binding bands; 6. a first insulating member; 71. a connecting row; 72. an output row; 81. an insulating and heat insulating pad; 82. and an insulating and heat-insulating end plate.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a battery module for delaying thermal runaway, as shown in fig. 1 to 3, which includes a housing 1, a battery module, two elastic members 4, an insulating plate 3 and a binding band 5, wherein a containing cavity 101 is defined in the housing 1, the battery module is disposed in the containing cavity 101 and includes twenty-four battery cells 2, an explosion-proof valve (not shown in the figure) is disposed at the center of each battery cell 2, the explosion-proof valve is configured to flush out the battery cell 2 when the gas pressure generated when the battery cell 2 is thermally runaway is greater than a preset pressure, the insulating plate 3 is attached to the end of the housing 1, a wire harness (not shown in the figure) is disposed directly above the insulating plate 3, one end of the elastic member 4 abuts against the insulating plate 3, the other end is fixedly disposed on the housing 1, the two elastic members 4 are respectively disposed at two ends of the insulating plate 3 and at two sides of the binding band 5, a portion of the binding band 5 is disposed directly above each battery cell, the binding band 5 is connected at one end to the insulating plate 3 and at the other end to the cover 1. When each battery cell 2 of the battery module is not in thermal runaway, the binding bands 5 are in a tensioned state, and the binding bands 5 can pull the insulating plates 3 to compress the elastic members 4 so that the elastic members 4 are in a compressed state; when thermal runaway of one of the battery cells 2 occurs, the explosion-proof valve rushes out of the battery cell 2, the binding band 5 is broken, and the elastic piece 4 pushes the insulating plate 3 to move towards the direction close to the wire harness and cut off the wire harness.
Specifically, the wire harness may be an electric wire for transmitting electric energy of the battery module delaying thermal runaway, the wire harness may be a transmission line for outputting an electric signal by using a detection element in the battery module delaying thermal runaway, and the wire harness may further include another connection line, which is not specifically limited in this embodiment.
It should be noted that, when no thermal runaway occurs in all the battery cells 2, because the bandage 5 is in a tightened state, the bandage has a tensile force on the insulating plate 3 at this time, because one end of the elastic member 4 departing from the insulating plate 3 is fixedly arranged on the cover body 1, and the elastic member 4 abuts against the insulating plate 3, so that the insulating plate 3 compresses the elastic member 4, at this time, the insulating plate 3 receives the thrust of the elastic member 4 and the tensile force of the bandage 5, when the two forces are the same, the insulating plate 3 is in a balanced state, and at this time, the elastic member 4 is in a compressed state. Once a certain battery cell 2 is out of thermal runaway, the explosion-proof valve is punched out, the binding band 5 is positioned right above the explosion-proof valve, at this time, high-temperature and high-pressure gas exhausted from the battery cell 2 firstly impacts the binding band 5, after the binding band 5 is punched out, the tensile force of the binding band 5 on the insulating plate 3 disappears instantly, as the elastic element 4 is still in a compression state, namely the pushing force of the elastic element 4 on the insulating plate 3 still exists, at this time, the insulating plate 3 is popped out instantly by the elastic element 4 and cuts off the wire harness, and at this time, the state of the battery module delaying thermal runaway is shown in fig. 3.
In other embodiments, the two opposite end portions of the cover body 1 may be provided with the elastic member 4 and the insulating plate 3, at this time, the two insulating plates 3 are respectively attached to the two opposite end portions of the cover body 1, one end of each elastic member 4 is abutted to the insulating plate 3, the other end of each elastic member 4 is fixedly disposed on the cover body 1, the two ends of the binding band 5 are respectively connected to the two insulating plates 3, and the specific arrangement mode is selected according to actual needs.
The battery module that delays thermal runaway that this embodiment provided, when a certain battery monomer 2 takes place thermal runaway, the explosion-proof valve is dashed out, the gaseous discharge thereupon of the high-temperature high-pressure part that this battery monomer 2 thermal runaway produced, bandage 5 that is located the explosion-proof valve top can resist gaseous impact, the impact force of gas to this battery module that delays thermal runaway has been reduced, bandage 5 is broken the back, insulation board 3 is popped out and cuts off the pencil by elastic component 4, make the total voltage of battery assembly reduce, the big voltage arc discharge phenomenon that produces insulation failure and bring between the different battery modules has been delayed, the time that all the other battery modules take place thermal runaway has been delayed, user's the length of time of fleing has been increased, the security of battery assembly has been improved.
As shown in fig. 1, the cover 1 of the present embodiment is provided with a guide groove 102, the insulating plate 3 is disposed in the guide groove 102, and the elastic member 4 pushes the insulating plate 3 to move along the guide groove 102 when the binding band 5 is broken so that at least a part of the insulating plate 3 protrudes out of the guide groove 102 and cuts the wire harness. The guide groove 102 extends in the height direction of the cover 1, and the insulating plate 3 can move in the length direction of the guide groove 102, thereby ensuring that the ejected insulating plate 3 can cut off the wire harness.
As shown in fig. 1, the cover body 1 of the present embodiment is provided with two parallel flanges 11, and each flange 11 extends toward a direction close to the battery cell 2 to support each battery cell 2. Specifically, the flanges 11 are perpendicular to the height direction of the cover body 1, the flanges 11 are located at two ends of each single battery 2 to support the single batteries 2, and the single batteries 2 are adhered to the cover body 1. In other embodiments, the battery cell 2 may be directly adhered to the inner wall of the cover 1 without providing the flange 11.
In order to reduce the influence of the change of the external environment temperature on the battery module delaying thermal runaway, as shown in fig. 1, a phase change protrusion 12 is arranged on the cover body 1 of the embodiment, the phase change protrusion 12 is fixed on the cover body 1, a phase change cavity is defined in the phase change protrusion 12, a cooling liquid with a large specific heat capacity is arranged in the phase change cavity, the cooling liquid can store or release heat, and the total specific heat capacity of the cover body 1, the phase change protrusion 12 and the cooling liquid is greater than or equal to 500J/(kg · K). When external environment temperature is higher, the coolant can absorb partial heat in order to reduce the amplitude value that battery monomer 2 temperature rose, and when external environment temperature was lower, heat transfer in the coolant was to the battery monomer 2 on in order to reduce the amplitude value that battery monomer 2 temperature dropped, and it is great to prevent that battery monomer 2 from receiving the influence of external environment's temperature.
As shown in fig. 1, the insulating plate 3 and the elastic member 4 of the present embodiment are both located outside the cover 1 and are both disposed at two opposite ends of the cover 1, and the end of the binding band 5 is connected to the insulating plate 3 after passing through the inner wall of the cover 1, the lower end of the cover 1, and the outer wall of the cover 1 in sequence. Specifically, the binding band 5 of the present embodiment is connected to the insulating plate 3 outside the cover 1 after passing through the inside of the cover 1 from the bottom of the cover 1, so that the binding band 5 pulls the insulating plate 3 and the insulating plate 3 compresses the elastic member 4, so that the binding band 5 is in a tightened state and the elastic member 4 is in a compressed state. In other embodiments, the insulating plate 3 and the elastic member 4 are both located inside the cover 1 and are both disposed at two opposite ends of the cover 1, and the end of the binding band 5 sequentially passes through the outer wall of the cover 1, the lower end of the cover 1 and the inner wall of the cover 1 and then is connected to the insulating plate 3, i.e., the binding band 5 passes through the outside of the cover 1 and then passes through the bottom of the cover 1 and then is connected to the insulating plate 3 inside the cover 1.
The elastic member 4 of this embodiment is a plate spring, and the lower end of the plate spring is connected to the cover 1 and the upper end of the plate spring is in contact with the insulating plate 3. The bandage 5 of this embodiment is made of an inelastic non-metallic material, and the bandage 5 is a mica tape, which has the characteristics of high strength and insulation. In other embodiments, the elastic member 4 is not limited to the plate spring of this embodiment, and may also be another elastic member having elasticity, and the binding band 5 may also be any one of a melamine tape, a polyurethane tape, and a boron nitride tape, or the binding band 5 may be at least two of a mica tape, a melamine tape, a polyurethane tape, and a boron nitride tape, or the binding band 5 may be made of another non-metallic material having high strength and insulation, and is specifically selected according to actual needs.
The insulating board 3 of this embodiment can cut off the one end of pencil for the cutting part, and the cross-sectional area of cutting part reduces along the direction that deviates from elastic component 4 gradually, and the upper end of insulating board 3 is comparatively sharp promptly to can cut off the pencil of top when guaranteeing elastic component 4 to pop out insulating board 3. Specifically, the insulating plate 3 of the present embodiment includes a metal plate and an insulating layer, and the insulating layer is located on a side of the metal plate away from the enclosure 1. The metal sheet can be by the steel alloy, the titanium alloy, metal materials such as chromium alloy make, the insulating layer bonds on the metal sheet, this insulating layer is the mica layer, the mica layer bonds on the metal sheet, the insulating layer can prevent that electrolyte etc. in this cover body 1 interior thermal runaway's battery monomer 2 from arousing thermal runaway easily outwards flowing, simultaneously can also hinder the flame in the cover body 1 outwards to stretch, if the battery monomer 2 in other cover bodies 1 takes place thermal runaway, this insulating layer not only can hinder and arouse thermal runaway's material easily and prevent that it from getting into cover body 1, can also completely cut off flame, the thermal runaway of battery module has been delayed, the insulating protective capacities of battery module has been promoted, the large voltage arc phenomenon that produces insulating failure and bring between the different battery module has been delayed. In other embodiments, the insulating layer may also be any one of a melamine layer, a polyurethane layer, and a boron nitride layer, or the insulating layer is composed of at least two of a mica layer, a melamine layer, a polyurethane layer, and a boron nitride layer, or the insulating layer is made of other non-metallic materials with higher strength and insulation, and is specifically selected according to actual needs.
Specifically, as shown in fig. 2, the battery module for delaying thermal runaway of the present embodiment further includes a first insulating member 6, the connecting row 71 and the output row 72, the first insulating member 6 is covered above the plurality of battery cells 2, forty-eight avoidance holes (not shown in the figure) are formed in the first insulating member 6, one tab of each battery cell 2 can extend out of one avoidance hole, the first insulating member 6 is located below the binding band 5, the connecting row 71 and the output row 72 are distributed in parallel and located above the first insulating member 6, one tab of each battery cell 2 is welded on the connecting row 71 to enable the battery cell 2 to be electrically connected with the connecting row 71, transmission of electric energy between the battery cell 2 and the connecting row 71 is completed, the other tab of each battery cell 2 is welded on the output row 72 to enable the battery cell 2 to be electrically connected with the output row 72, and transmission of electric energy between the battery cell 2 and the output row 72 is completed.
The twenty-four battery cells 2 of the present embodiment are equally divided into eight battery packs, and the eight battery packs form one battery module, each of which includes three battery cells 2 bonded face to face. As shown in fig. 2, the battery module for delaying thermal runaway of the present embodiment further includes seven insulating heat cushions 81 and two insulating heat end plates 82, each insulating heat cushion 81 is sandwiched between two battery packs, the two insulating heat end plates 82 are respectively fixed at two opposite ends of the battery module, and two opposite side surfaces of the insulating heat end plates 82 of the present embodiment are respectively bonded to the battery module and the inner wall of the cover body 1. In order to smoothly interpose the insulating and heat insulating mat 81 between the two battery packs, two side surfaces of the insulating and heat insulating mat 81, which are disposed opposite to each other, are respectively bonded to the two battery packs. In other embodiments, the number of the insulating and heat insulating mats 81 is not limited to seven in the present embodiment, and is specifically determined according to the number of the battery packs, the number of the insulating and heat insulating mats 81 is one less than the number of the battery packs, and each insulating and heat insulating mat 81 is sandwiched between two battery packs.
The insulating and heat-insulating pad 81 of the embodiment is a mica pad, when the thermal runaway of the battery cell 2 occurs, high-temperature and high-pressure gas can be sprayed, the insulating and heat-insulating pad 81 can effectively resist the thermal shock of the gas, the impact force received by the battery pack is reduced to the minimum, and the thermal runaway is effectively delayed. In other embodiments, the insulating and heat-insulating pad 81 may also be one of a melamine pad, a polyurethane pad, and a boron nitride pad, or the insulating and heat-insulating pad 81 is composed of at least two of a mica pad, a melamine pad, a polyurethane pad, and a boron nitride pad, or the insulating and heat-insulating pad 81 is made of other insulating and heat-insulating materials, which is selected according to actual needs.
This embodiment still provides a battery assembly, including a plurality of battery module that delays thermal runaway as this embodiment, a plurality of battery module that delays thermal runaway passes through the pencil electricity and connects, and this pencil is located insulating board 3 directly over, and when certain battery unit takes place thermal runaway, insulating board 3 can cut off this pencil.
The battery assembly provided by the embodiment has the battery module for delaying thermal runaway, and when a certain battery monomer 2 is subjected to thermal runaway, the battery assembly has the characteristics that the impact force is small, the large-voltage arc discharge phenomenon among different battery modules is delayed, the time for thermal runaway of the other battery modules is delayed, and the safety is high.
The embodiment also provides an electric vehicle which comprises a vehicle body and a plurality of battery modules for delaying thermal runaway, wherein the battery modules for delaying thermal runaway are arranged on the vehicle body.
The electric vehicle provided by the embodiment has the advantages that the battery module for delaying thermal runaway has small impact force, large voltage arcing between different battery modules is delayed, the time for thermal runaway of other battery modules is delayed, and the safety is high.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. A battery module that delays thermal runaway, comprising:
a cover (1) defining a housing chamber (101) therein;
the battery module is arranged in the accommodating cavity (101) and comprises a plurality of battery monomers (2), each battery monomer (2) is provided with an explosion-proof valve, and the explosion-proof valves are configured to flush out the battery monomers (2) when the gas pressure generated when the thermal runaway of the battery monomers (2) is greater than the preset pressure;
the insulating plate (3) is attached to the end part of the cover body (1), and a wire harness is arranged right above the insulating plate (3);
one end of the elastic piece (4) is abutted against the insulating plate (3), and the other end of the elastic piece (4) is fixedly arranged on the cover body (1);
the bandage (5), some said bandage (5) is located directly over each said battery monomer (2) and the said bandage (5) is set up against the said explosion-proof valve, at least one end of the said bandage (5) couples to said insulating board (3);
when each battery cell (2) of the battery module is not in thermal runaway, the binding bands (5) are in a tight state, and the binding bands (5) can pull the insulation plates (3) to compress the elastic members (4) so that the elastic members (4) are in a compressed state;
when thermal runaway of one battery cell (2) occurs, the explosion-proof valve rushes out of the battery cell (2) and the binding band (5) is broken, and the elastic piece (4) pushes the insulating plate (3) to move towards the direction close to the wire harness and cut off the wire harness.
2. The battery module for delaying thermal runaway according to claim 1, wherein a guide groove (102) is formed in the cover body (1), the insulating plate (3) is arranged in the guide groove (102), and the elastic member (4) pushes the insulating plate (3) to move along the guide groove (102) when the binding band (5) is broken so that at least part of the insulating plate (3) protrudes out of the guide groove (102) and the wiring harness is cut off.
3. The battery module for delaying thermal runaway according to claim 1, wherein the insulating plate (3) and the elastic member (4) are both located on the outer side of the cover body (1) and are both disposed at opposite ends of the cover body (1), and the end of the binding band (5) is connected to the insulating plate (3) after passing through the inner wall of the cover body (1), the lower end of the cover body (1) and the outer wall of the cover body (1) in sequence.
4. The battery module for delaying thermal runaway according to claim 1, wherein the elastic member (4) comprises a leaf spring, the lower end of the leaf spring is connected to the cover (1), and the upper end of the leaf spring abuts against the insulating plate (3).
5. The battery module for delaying thermal runaway according to claim 1, wherein the binding tape (5) is at least one of a mica tape, a melamine tape, a polyurethane tape and a boron nitride tape.
6. The battery module for delaying thermal runaway according to claim 1, wherein the end of the insulating plate (3) capable of cutting off the wiring harness is a cut portion having a cross-sectional area that gradually decreases in a direction away from the elastic member (4).
7. The battery module for delaying thermal runaway according to claim 1, wherein the insulating plate (3) comprises a metal plate and an insulating layer, and the insulating layer is located on one side of the metal plate, which is away from the cover body (1).
8. The battery module for delaying thermal runaway of claim 7, wherein the insulating layer comprises at least one of a mica layer, a melamine layer, a polyurethane layer, and a boron nitride layer, and the insulating layer is bonded to the metal plate.
9. The battery module delaying thermal runaway according to claim 1, further comprising a first insulating member (6), wherein the first insulating member (6) covers the battery module, a plurality of avoiding holes are formed in the first insulating member (6), and one tab of each single battery (2) can extend from one avoiding hole.
10. A battery assembly comprising the battery module for delaying thermal runaway according to any one of claims 1 to 9.
11. An electric vehicle, characterized by comprising a vehicle body and the thermal runaway postponed battery module as claimed in any one of claims 1 to 9, wherein the thermal runaway postponed battery module is arranged on the vehicle body.
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| CN202110063872.2A CN112652858B (en) | 2021-01-18 | 2021-01-18 | Battery module, battery assembly and electric motor car that delay thermal runaway |
| PCT/CN2021/135937 WO2022151872A1 (en) | 2021-01-18 | 2021-12-07 | Battery module group, battery assembly, and electric vehicle |
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| CN202110063872.2A CN112652858B (en) | 2021-01-18 | 2021-01-18 | Battery module, battery assembly and electric motor car that delay thermal runaway |
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| WO2022151872A1 (en) * | 2021-01-18 | 2022-07-21 | 中国第一汽车股份有限公司 | Battery module group, battery assembly, and electric vehicle |
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| CN117673671A (en) * | 2022-08-31 | 2024-03-08 | 比亚迪股份有限公司 | Battery pack and control method for voltage breaking of battery pack |
| CN115832565B (en) * | 2022-12-28 | 2024-01-26 | 厦门海辰储能科技股份有限公司 | Battery module and battery pack |
| CN116960579B (en) * | 2023-09-18 | 2024-01-26 | 厦门海辰储能科技股份有限公司 | Battery module and electric equipment |
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| CN112652858B (en) | 2022-06-10 |
| WO2022151872A1 (en) | 2022-07-21 |
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