CN209860040U - Lithium ion battery explosion-proof device and explosion-proof lithium ion battery - Google Patents
Lithium ion battery explosion-proof device and explosion-proof lithium ion battery Download PDFInfo
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- CN209860040U CN209860040U CN201920654559.4U CN201920654559U CN209860040U CN 209860040 U CN209860040 U CN 209860040U CN 201920654559 U CN201920654559 U CN 201920654559U CN 209860040 U CN209860040 U CN 209860040U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a lithium ion battery explosion-proof equipment and explosion-proof lithium ion battery belongs to the battery explosion-proof field. The lithium ion battery explosion-proof device comprises a cover plate, wherein the shape of the cover plate is matched with the installation position of the lithium ion battery explosion-proof valve, a convex cover is arranged on the cover plate, a through hole is formed in the surface of the convex cover, a film layer is covered in the convex cover, and the film layer covers the surface of the through hole, which is close to one side of the convex cover. The lithium ion battery explosion-proof device can timely release the pressure inside the battery according to the change inside the lithium ion battery, and ensures that the lithium ion battery cannot explode because of overhigh temperature or overhigh pressure, and is simple in structure and convenient to produce.
Description
Technical Field
The utility model belongs to the battery explosion-proof field, more specifically say, relate to a lithium ion battery explosion-proof equipment and explosion-proof lithium ion battery.
Background
The lithium ion battery has small volume, high capacity and long cycle life, is the first choice for energy supply of 3C digital electrical appliances, new energy automobiles and the like, and is an important choice for the state to vigorously develop new energy industries. However, lithium metal is an active metal, and most organic solvents used by lithium ion batteries are flammable, so that the lithium ion batteries have the possibility of explosion under extreme conditions, and most of the lithium ion batteries with square aluminum shells and steel shells are provided with explosion-proof valves.
The aluminium material that traditional explosion-proof valve mostly all used is provided with weak slot on the aluminum sheet, and this groove is more sensitive to pressure, and after battery internal pressure exceeded the setting value, the slot on the aluminum sheet was directly broken through, and the inside and outside UNICOM of battery lets out internal pressure to play the effect of protection battery. However, in practical use, especially when explosion-proof valves are produced in batch, the actual starting pressures of the traditional explosion-proof valves are often greatly different; the actual starting pressure of the explosion-proof valve is too small, and the explosion-proof valve is easily broken to cause the abandonment of the explosion-proof valve; the actual starting pressure of the explosion-proof valve is too large, so that the explosion-proof effect on the battery cannot be achieved, potential safety hazards exist, and safety accidents are easy to happen.
Meanwhile, the sensitivity of the aluminum explosion-proof valve to temperature is not enough, the rise of the internal temperature of the battery is usually accompanied with the rise of pressure, but the internal temperature of the battery rises, the internal pressure of the battery cannot rise to the detonation pressure of the safety valve at once, and a certain delay exists, so that hidden danger is left for the safety of the battery, and the traditional aluminum explosion-proof valve is difficult to process, high in cost and not beneficial to use.
Through search, the Chinese patent application numbers are: 200910213656.0, filing date: 2009.12.08's "lithium ion battery explosion-proof valve", it includes valve body, needle body and rupture membrane, is provided with the air vent on the valve body, needle body fixed connection is in the upper end of air vent, and the lower surface of needle body sets up the toper contact pilotage, and the rupture membrane setting is at the lower extreme of air vent and with the sealed assembly of valve body, the directional rupture membrane of toper contact pilotage. According to the explosion-proof valve of the lithium ion storage battery, the explosion-proof membrane is made of ethylene propylene diene monomer rubber, so that the explosion-proof membrane is good in elasticity and large in thickness, and cannot be easily broken, the safety and reliability of the battery are improved, and the service life is prolonged; however, the conical contact pin is used as a key tool for pressure relief of the explosion-proof valve, on one hand, the installation difficulty of the conical contact pin is high, and on the other hand, the explosion-proof valve of the lithium ion storage battery cannot solve the hidden trouble caused by temperature rise and untimely rise of the internal air pressure of the battery.
Also, for example, the Chinese patent application number is: 201220635503.2, filing date: 2012.11.26's "plastic casing lithium ion power battery explosion-proof valve", including setting up the valve body on the lid is moulded to the battery, be equipped with the venthole on the valve body, the interior bottom of valve body is equipped with annular pinnacle step, and plastic casing lithium ion power battery explosion-proof valve seals there is the aluminium membrane on the venthole, and the aluminium membrane presss from both sides and presses between annular pinnacle step and lock mother, and the lock mother passes through external screw thread connection on the valve body. The explosion-proof valve achieves the purpose of explosion prevention by utilizing the principle that the metal aluminum film is broken under the action of a set force, and solves the potential safety hazard caused by overhigh internal pressure of the battery under the common condition; however, the installation process of the aluminum film of the explosion-proof valve is complex, the required precision is high, and the difficulty is brought to batch production.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the existing lithium ion battery explosion-proof valve can not simultaneously solve the problem that the internal temperature and pressure of the battery cause the explosion of the battery, the utility model provides a lithium ion battery explosion-proof device; the lithium ion battery explosion-proof device can timely release the pressure inside the battery according to the change inside the lithium ion battery, and ensures that the lithium ion battery cannot explode because of overhigh temperature or overhigh pressure, and is simple in structure and convenient to produce.
One of the purposes of the present invention is to provide a lithium ion battery with the above lithium ion battery explosion-proof device, wherein the explosion-proof performance of the lithium ion battery is enhanced significantly under the condition of using the above lithium ion battery explosion-proof device, and the lithium ion battery can face various conditions generated in the using process.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
The utility model discloses a lithium ion battery explosion-proof equipment: the cover plate is matched with the installation position of the lithium ion battery explosion-proof valve in shape, a convex cover is arranged on the cover plate, a through hole is formed in the surface of the convex cover, a film layer is covered in the convex cover, and the film layer covers the surface of one side, close to the convex cover, of the through hole. The cover plate is matched with the installation position of the lithium ion battery, is suitable for different lithium ion batteries, and has wide applicability. The cover plate is provided with a convex cover, the cover plate and the convex cover can be integrally processed, a mold can be manufactured in advance according to the structural shapes of the cover plate to be processed and the convex cover, then raw materials are injected into the mold, and the mold is opened after the molding to obtain a finished product; the finished product can also be processed by machining. The cover plate and the convex cover can be separately processed, the materials used by the cover plate and the convex cover can be different, and the processed cover plate and the convex cover are connected into a whole through glue or other modes.
The through hole on the surface of the convex cover is mainly used for communicating the internal part of the lithium ion battery with the external environment when the battery generates abnormal conditions such as temperature, pressure and the like. In order to ensure that the lithium ion battery is separated from the external environment in a normal working state; and the interior of the lithium ion battery is communicated with the external environment under abnormal conditions of temperature rise, pressure increase and the like. A film coating layer is required to be coated at the through hole, and the film layer blocks the communication between the inside of the lithium ion battery and the external environment in a normal state; when the temperature in the lithium ion battery rises and the pressure intensity is increased, the film layer is softened by the high temperature, and the film layer can be broken by the larger pressure intensity, so that the inside of the lithium ion battery is communicated with the external environment.
As the preferred scheme of the utility model, the convex cover internal surface be equipped with hollow cylinder, hollow cylinder top surface height be less than apron upper surface height. The hollow cylinder is connected with the convex cover at one hollow end, and the connection part is a through cylinder, so that when the temperature inside the lithium ion battery does not change and only the pressure intensity changes, the film layer cannot be softened into a viscous state due to the change of the temperature, and the resistance of the pressure inside the lithium ion battery to break through the film layer is reduced. The hollow cylinder is arranged, so that the possibility of breaking through the film layer is provided when the pressure inside the lithium ion battery is changed and the temperature is not changed.
In addition, under the condition that the temperature in the battery is not greatly increased or only the pressure is temporarily increased, the hollow cylinder is arranged in the convex cover, the top surface of the hollow cylinder is covered with the film layer, the pressure in the lithium ion battery can break through the second film layer in the hollow cylinder firstly, so that the inside of the lithium ion battery is communicated with the outside to a certain extent, and after the pressure in the lithium ion battery is temporarily released, the pressure in the lithium ion battery is reduced.
As the preferred scheme of the utility model, hollow cylinder top surface highly be higher than the highest height that the through-hole set up in the convex cover. The pressure inside the lithium ion battery is small or the pressure is temporarily increased, so that the pressure can be successfully released from the hollow cylinder, the hollow cylinder needs to be in contact with the inner cavity of the lithium ion battery relative to the through hole, the height of the hollow cylinder needs to be higher than the highest height of the through hole, and the purpose of protecting the lithium ion battery can be achieved.
As the preferred scheme of the utility model, the rete include first rete and second rete, first rete and protruding lid internal surface contact to cover the through-hole surface, the second rete cover on first rete surface. In the coating process of carrying out the rete, glue or other bonding thing are directly emptyd, probably make glue or bonding thing see through the through-hole and spill over the convex cover, the spill thing is to lithium ion battery's installation hindrance effect, and the spill thing condenses into the piece at the surface of convex cover, break through the rete to lithium ion battery internal pressure and cause very big hindrance, can cause the rete can not break through under lithium ion critical pressure, cause the battery to explode easily, cause the hindrance to lithium ion battery's safe handling, and cause certain economic loss, still can make personnel take place the damage.
As the preferable proposal of the utility model, the distance between the through hole and the upper surface of the cover plate is 0.2-2 mm. The setting of the depth of the convex cover has certain influence on the setting of the film layer and the overall use of the lithium ion battery, and the setting of the depth of the convex cover is too shallow. The film layer can not be coated, the film layer can not be divided into two layers for coating, the convex cover is arranged too deeply, the coating difficulty of the second film layer is increased, the thickness of the second film layer is difficult to control, and the surface of the second film layer is kept flat; on the other hand, the depth of the convex cover is too deep, the volume of the explosion-proof device is increased, the effect of blocking the assembly and the use of the battery is achieved, and the effective use of the lithium ion battery is not facilitated.
As the preferred scheme of the utility model, first rete cover at hollow cylinder top surface, second rete surface flush with apron upper surface. According to the depth of the convex cover and the fact that the surface of the second film layer is flush with the upper surface of the cover plate, the coating depth of the second film layer can be determined, and coating of the second film layer is facilitated.
As the preferable scheme of the utility model, the melting point or the temperature range of the second film layer converted into the viscous state is 100-180 ℃. In the actual use process, the first film layer and the second film layer have a certain difference, the first film layer mainly plays a role in filling the through holes, the thin layer is brushed on the inner side of the convex cover to connect the through holes, and fillers in the through holes are prevented from falling out of the through holes. The second film layer has the main characteristic that the second film layer is softened to a certain extent at a temperature of more than 100 ℃ so that the film layer can be smoothly broken through by the air pressure in the battery, but the film layer can not be broken through by the pressure in the lithium ion battery due to the overhigh melting point or overhigh temperature for converting into a viscous state. So first rete and second rete can select different materials to fill according to the characteristic, and the characteristic of first rete is for having certain adhesive action, covers and can not take place to separate with the convex cover at the convex cover internal surface, can block up the through-hole simultaneously, prevents that the second rete from leaking through the through-hole. The melting point of the second film layer or the temperature range of the second film layer converted into the viscous state has certain limitation, and the second film layer can be bonded with the first film layer by adapting to the temperature of the lithium ion battery under the condition of external short circuit or overcharge, and the curing time of the second film layer is shortened so as to effectively improve the preparation efficiency of the lithium ion battery explosion-proof device when the second film layer is coated.
As the preferred scheme of the utility model, the main components of the cover plate are more than one of PE, HDPE, PMMA, PP and PVC, and the initial temperature range of the cover plate which begins to be changed into the viscous state is 100-180 ℃. Under the condition of short circuit or overcharge between the inside and the outside of the lithium ion battery, the initial temperature inside the lithium ion battery can reach 150 ℃, the melting point of PE, HDPE and PMMA is 100-. When the temperature of the lithium ion battery rises sharply, the state of the cover plate needs to be changed, so that a better protection effect on the lithium ion battery can be achieved, at the moment, the cover plate is changed into a viscous state, the hardness of the cover plate is changed on one hand, and the gas in the lithium ion battery conveniently breaks through the limitation of the explosion-proof device; on the other hand, the cover plate can deform to a certain extent in the softening process, so that the air pressure inside the lithium ion battery can be conveniently released to a certain extent, and the explosion-proof effect is more excellent.
The utility model discloses an explosion-proof lithium ion battery, including the lithium ion battery explosion-proof equipment of above-mentioned arbitrary, the protruding lid cover and to have one side of rete to arrange the battery outside in. Under the condition of using the lithium ion battery explosion-proof device, the explosion-proof performance of the lithium ion battery is obviously enhanced, and the lithium ion battery explosion-proof device can face various conditions generated in the using process of the lithium ion battery.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a lithium ion battery explosion-proof equipment, lithium ion battery can the temperature rise in the inside and outside of the battery under the condition such as short circuit or overcharge, pressure rise, through temperature softening rete and apron, make it become viscous state, the restriction of rete is broken through to the pressure in the inside of the battery of lithium ion, release the pressure in the battery, ensure that lithium ion battery can not cause the battery explosion because of high temperature or high pressure, and its simple structure also is convenient for produce;
(2) the utility model discloses a lithium ion battery explosion-proof equipment, there is not temperature variation in the battery, only when pressure changes, need accomplish the release work of lithium ion battery internal pressure through hollow cylinder, hollow cylinder is because the thickness of the rete thickness that covers above is thinner for the thickness of through-hole, even there is not temperature to change, the thin rete on the hollow cylinder also can be broken through to the pressure of lithium ion battery internal pressure, the height of hollow cylinder can be according to the nature of specifically using the rete material and the pressure that produces in the corresponding battery, and test and calculating through actual production obtain;
(3) the utility model discloses a lithium ion battery explosion-proof equipment, when the temperature rise is little in the battery, or only transient pressure rise, under the condition that still need to use after the pressure releases, the hollow cylinder not only can carry out the release of lithium ion battery internal pressure, after carrying out pressure release, can also guarantee that lithium ion battery internal and outside keep the relatively independent space, provide the basis for the safe and stable use of lithium ion battery;
(4) the utility model discloses a lithium ion battery explosion-proof equipment, the rete adopts the mode that first rete and second rete combine to use, has solved and has used single rete, glue or other bonding thing can flow out the phenomenon that the through-hole condenses on the through-hole surface, has guaranteed the use that lithium ion battery explosion-proof equipment can be safe and stable;
(5) the utility model discloses a lithium ion battery explosion-proof equipment, lithium ion battery is under inside and outside short circuit or overcharge condition, and its inside initial temperature can reach 150 ℃, for lithium ion battery can safe effectual use, the result of use is better, need second rete and apron under lithium ion battery abnormal condition, can soften, can change into viscous state in time, can release the pressure in the battery in time, make lithium ion battery's use safer;
(6) the utility model discloses an explosion-proof lithium ion battery under the condition that has used above-mentioned lithium ion battery explosion-proof equipment, it has the one side of rete to cover the convex cover and arranges the battery outside in, because second rete flushes with the apron upper surface, can not the protrusion come, has avoided scraping to destroy the second rete, and lithium ion battery's explosion-proof ability is showing the reinforcing, can be in the face of the various circumstances that lithium ion battery produced in the use, simple structure, reasonable in design, easily production.
Drawings
Fig. 1 is a schematic view of the overall structure of an explosion-proof device of a lithium ion battery of embodiment 1 of the present invention without coating a film layer;
fig. 2 is a schematic structural diagram of an explosion-proof device for a lithium ion battery according to embodiment 1 of the present invention;
fig. 3 is a schematic cross-sectional view taken at a-a in fig. 2.
In the drawings: 1. a cover plate; 2. a convex cover; 3. a through hole; 4. a hollow cylinder; 5. a film layer; 6. a first film layer; 7. a second film layer.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration exemplary embodiments in which the invention may be practiced. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the present invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to provide the best mode contemplated for carrying out the invention and to enable any person skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.
The detailed description and exemplary embodiments of the invention may be better understood when read in conjunction with the following drawings, where the elements and features of the invention are identified by reference numerals.
The utility model discloses a lithium ion battery preventsThe design idea of the explosion device comes from that when 1665130 ternary batteries are manufactured in a production experiment, the safety valve adopts a traditional aluminum explosion-proof valve, the starting pressure of the safety valve of a batch battery is too low, and the standard starting pressure needs 1.2x106Pa, and the actual measured starting pressure of the safety valve is only 4.0x105Pa. After continuous thinking, testing and adjustment, the safety valve is coated with a layer of colloid substance, so that the starting pressure of the safety valve is increased. However, the safety performance of the conventional safety valve is insufficient when the safety valve is used in a battery, and sometimes the battery is abnormal because the internal pressure of the battery cannot be released in a test. Under the condition that the internal and external parts of the battery are short-circuited or overcharged, the temperature and the pressure in the battery are increased, but the temperature is not increased, for example, in the process of injecting and baking the battery, the internal pressure of the battery is increased due to the influence of factors such as moisture and the like, but the temperature is not increased, so that a scheme capable of solving the two conditions is required to be met, and therefore, an exploration experiment is carried out, and an explosion-proof device with good safety performance is designed.
Example 1
As shown in fig. 1, the explosion-proof device for a lithium ion battery of this embodiment structurally includes a cover plate 1, a convex cover 2, a through hole 3, and a hollow cylinder 4. A coating layer 5 is coated in the convex cover 2 provided with the through hole 3 and the hollow column 4.
Apron 1 is the rectangle, is equipped with hemisphere convex cover 2 in the middle of the apron 1, and both sides are utmost point ear, and apron 1 and convex cover 2 formula as an organic whole are moulded plastics and are formed, and the material selection of apron 1 and convex cover 2 is PMMA. Through holes 3 are uniformly distributed on the surface of the convex cover 2, as shown in fig. 2, the distance from the through holes 3 to the upper surface of the cover plate 1 is 1.2mm farthest, and the distance from the through holes 3 to the upper surface of the cover plate 1 is 0.8mm nearest.
The convex cover 2 is internally covered with a film layer 5, and the film layer 5 covers the surface of the through hole 3 close to one side of the convex cover 2. The cover plate 1 is suitable for square double-lug batteries, and the shape of the cover plate 1 can be designed according to the requirements of different types of battery structures. The through hole 3 on the surface of the convex cover 2 is mainly used for communicating the internal part of the lithium ion battery with the external environment when the battery simultaneously generates abnormal conditions such as temperature, pressure intensity and the like. In order to ensure that the lithium ion battery is separated from the external environment in a normal working state; and the interior of the lithium ion battery is communicated with the external environment under abnormal conditions of temperature rise, pressure increase and the like. A coating layer 5 is required to be coated on the through hole 3, and the coating layer 5 blocks the communication between the inside of the lithium ion battery and the external environment in a normal state; when the temperature inside the lithium ion battery rises and the pressure intensity increases, the membrane layer 5 is softened by the high temperature, and the membrane layer 5 is broken by the larger pressure intensity, so that the inside of the lithium ion battery is communicated with the external environment.
The melting point of PMMA is about 130-140 ℃, the initial temperature of the interior of the lithium ion battery can reach 150 ℃ under the condition of short circuit or overcharge of the interior and the exterior of the lithium ion battery, the temperature of the lithium ion battery is sharply increased, the state of the cover plate 1 needs to be changed, and the lithium ion battery can be better protected, at the moment, the cover plate 1 is changed into a viscous state, the hardness of the cover plate 1 is changed, and the gas in the lithium ion battery is convenient to break the limitation of the explosion-proof device; on the other hand, certain deformation can take place for apron 1 at the in-process that softens, to a certain extent, the release of the inside atmospheric pressure of lithium ion battery of being convenient for, and explosion-proof effect is more excellent.
The upper surface of the cover plate 1 refers to the surface of the cover plate 1 on the opposite side of the convex cover 2, the depth of the convex cover 2 has certain influence on the setting of the film layer 5 and the use of the lithium ion battery as a whole, and the depth of the convex cover 2 is too shallow. The film layer 5 cannot be coated, the film layer 5 cannot be divided into two layers for coating, the convex cover 2 is too deep, the coating difficulty of the second film layer 7 is increased, the thickness of the second film layer 7 is difficult to control, and the surface of the second film layer 7 is difficult to keep flat; on the other hand, the depth of the convex cover 2 is too deep, so that the volume of the explosion-proof device is increased, the effect of blocking the assembly and the use of the battery is achieved, and the effective use of the lithium ion battery is not facilitated.
Under the conditions of short circuit or overcharge of the lithium ion battery inside and outside, the temperature and the pressure inside the lithium ion battery are increased, the film layer 5 and the cover plate 1 are softened by the temperature to be changed into a viscous state, the pressure inside the lithium ion battery breaks through the limit of the film layer 5, the pressure inside the battery is released, and the lithium ion battery is prevented from causing battery explosion due to overhigh temperature or overhigh pressure.
As shown in fig. 3, the hollow cylinder 4 is disposed at the center of the convex cover 2, the connection with the convex cover 2 is through, the hollow cylinder 4 is a cylindrical hollow cylinder, and the distance between the top surface of the hollow cylinder 4 and the upper surface of the cover plate 1 is 0.2 mm. When the temperature inside the lithium ion battery does not change and only the pressure intensity changes, the film layer 5 cannot be softened and changed into a viscous state due to the change of the temperature, and the resistance of the pressure inside the lithium ion battery to break through the film layer 5 is reduced. The hollow cylinder 4 is arranged, so that the possibility of breaking through the membrane layer 5 is provided when the pressure inside the lithium ion battery is changed and the temperature is not changed.
In addition, under the condition that the temperature in the battery is not greatly increased or only the pressure is temporarily increased, the hollow cylinder 4 is arranged in the convex cover 2, the top surface of the hollow cylinder 4 is covered with the film layer 5, the pressure in the lithium ion battery can firstly break the second film layer 7 in the hollow cylinder 4, so that the inside of the lithium ion battery is communicated with the outside to a certain extent, and the pressure in the lithium ion battery is reduced after being temporarily released.
In order to enable the pressure to be successfully released from the hollow cylinder 4, the hollow cylinder 4 needs to contact the inner cavity of the lithium ion battery with respect to the through hole 3 first, so that the height of the hollow cylinder 4 needs to be higher than the highest height of the through hole 3, at this time, the purpose of protecting the lithium ion battery can be achieved, the release work of the internal pressure of the lithium ion battery needs to be completed through the hollow cylinder 4, the hollow cylinder 4 is thin due to the fact that the thickness of the film layer 5 covered on the hollow cylinder 4 is smaller than the thickness of the through hole 3, even if the temperature does not change, the thin film layer 5 on the hollow cylinder 4 can be broken through the internal pressure of the lithium ion battery, and the height of the hollow cylinder 4 can be obtained through testing and measuring in actual production according to the property of the specifically used film layer 5 material and the pressure generated inside the.
The film layer 5 comprises a first film layer 6 and a second film layer 7, the first film layer 6 is made of vaseline and contacts with the inner surface of the convex cover 2, the surface of the through hole 3 and the top surface of the hollow cylinder 4 are covered, the second film layer 7 is made of epoxy resin glue and covers the surface of the vaseline, and the surface of the epoxy resin glue is flush with the upper surface of the cover plate 1. When the temperature in the lithium ion battery rises and the air pressure reaches 7-9 atmospheric pressures, the corresponding part of the film layer 5 can be broken, so that the effect of protecting the lithium ion battery is achieved.
In the coating process of carrying out rete 5, glue or other bonding thing are directly emptyd, probably make glue or bonding thing see through-hole 3 and spill over convex cover 2, the spill is to lithium ion battery's installation hindrance effect, and the spill condenses into the piece at the surface of convex cover 2, break through rete 5 to lithium ion battery internal pressure and cause very big hindrance, can cause rete 5 can not break through under lithium ion critical pressure, cause the battery to explode easily, cause the hindrance to lithium ion battery's safe handling, and cause certain economic loss, still can make personnel take place the damage. According to the depth of the convex cover 2 and the fact that the surface of the second film layer 7 is flush with the upper surface of the cover plate 1, the coating depth of the second film layer 7 can be determined, and coating of the second film layer 7 is facilitated.
The epoxy resin adhesive can be converted from a solid state into a viscous state within the temperature range of 100-180 ℃, in the actual use process, the first film layer 6 and the second film layer 7 have a certain difference, the first film layer 6 mainly plays a role in filling the through hole 3, namely the first film layer 6 covers the inner surface of the through hole 3 by utilizing the surface tension, the setting diameter of the through hole 3 is related to the battery performance, the first film layer 6 has certain surface tension and can cover a film layer on a hole with the diameter of less than 2mm (according to the related record of 360 encyclopedia, the film thickness can be as thin as several micrometers and as thick as several millimeters), and the first film layer 6 has a certain bonding effect with the second film layer 7 (if the adhesion performance between the first film layer 6 and the second film layer 7 is not good, the inner surface of the convex cover 2 cannot be completely covered when the first film layer 6 covers the surface of the through hole 3, a contact space between the second film layer 7 and the convex cover 2 needs to be reserved) so that the second film layer 7 and the first film layer 6 form a film layer 5 as a whole, and a thin layer is brushed on the inner side of the convex cover 2 to connect the through holes 3, thereby avoiding the filler in the through holes 3 from falling out of the through holes 3. The second film layer 7 is mainly characterized in that the second film layer is softened to a certain extent at a temperature of more than 100 ℃ so that the film layer 5 can be smoothly broken by the internal air pressure of the battery, but the film layer 5 cannot be broken by the internal pressure of the lithium ion battery due to an excessively high melting point or an excessively high temperature for converting into a viscous state. Therefore, the first film layer 6 and the second film layer 7 can be filled with different materials according to characteristics, and can cover the inner surface of the convex cover 2 without being separated from the convex cover 2, and can block the through hole 3 to prevent the second film layer 7 from leaking through the through hole 3. The melting point of the second film layer 7 or the temperature range of the second film layer 7 converted into the viscous state has certain limitation, and the second film layer 7 can be bonded with the first film layer 6 due to the fact that the second film layer is required to adapt to the temperature of the lithium ion battery under the condition of external short circuit or overcharge, and the preparation efficiency of the lithium ion battery explosion-proof device can be effectively improved due to the fact that the curing time of the second film layer 7 is shortened when the second film layer 7 is coated.
Example 2
The structure of the present embodiment is substantially the same as that of embodiment 1, and the difference is that: the shape of apron 1 is circular, is applicable to cylindrical lithium ion battery, apron 1 adopts the PE material to mould plastics with convex cover 2 and forms, is provided with convex cover 2 in the middle of the apron 1, and the 2 outlines of convex cover are cylindrical, and through-hole 3 is 0.2mm apart from 1 upper surface distance of apron on the convex cover 2, and hollow cylinder 4 is located apron 1 central point and puts, and central cylinder top surface is 0.1mm apart from 1 upper surface distance of apron, and first rete 6 adopts epoxy to glue.
Example 3
The structure of this embodiment is substantially the same as that of embodiment 2, and the difference is that: the cover plate 1 and the convex cover 2 adopt PE and HDPE in proportion of 1: 1 combined material moulds plastics and forms, is provided with protruding lid 2 in the middle of the apron 1, and 2 outlines of protruding lid are cylindrical, and 2 upper through-holes 3 of protruding lid are apart from 1 upper surface distance of apron and are 2mm, and hollow cylinder 4 is located apron 1 central point and puts, and central cylinder top surface is apart from 1 upper surface distance of apron and is 0.4mm, and first rete 6 adopts vaseline.
Example 4
The structure of this embodiment is substantially the same as that of embodiment 2, and the difference is that: the cover plate 1 is made of PMMA material, and a round hole is reserved in the center. The convex cover 2 is made of PP materials, the outline is cylindrical, and the cover plate 1 and the convex cover 2 are bonded through glue for bonding plastic products. The distance from the through hole 3 on the convex cover 2 to the upper surface of the cover plate 1 is 1.5mm, the hollow column body 4 is positioned at the central position of the cover plate 1, the distance from the top surface of the central column body to the upper surface of the cover plate 1 is 0.3mm, and the first film layer 6 adopts vaseline.
Example 5
The production method of the lithium ion battery explosion-proof device of the embodiment is based on any one of the lithium ion battery explosion-proof devices with the structural sizes of the embodiments 1 to 4, and comprises the following steps:
s1, manufacturing a battery cover plate 1 according to the shape and structure design of the lithium ion battery, and processing a convex cover 2, a through hole 3 and a hollow cylinder 4 on the cover plate 1;
s2, coating a first film layer 6 on the inner surface of the convex cover 2 of the formed battery cover plate 1 in advance, so that the first film layer 6 covers the inner surface of the through hole 3 in the convex cover 2 and the top surface of the hollow cylinder 4;
and S3, covering the raw material of the second film layer 7 into the convex cover 2, wherein the surface of the second film layer 7 is flush with the upper surface of the cover plate 1, and finishing the preparation of the battery explosion-proof device after the film layer 5 is cured.
Example 6
The explosion-proof lithium ion battery of the embodiment comprises the explosion-proof device of any one of the embodiments 1 to 4, and one side of the convex cover 2 covered with the film layer 5 is arranged on the outer side of the battery. Under the condition that has used above-mentioned lithium ion battery explosion-proof equipment, place the battery outside in with one side that the convex cover 2 covers rete 5, because second rete 7 flushes with 1 upper surface of apron, can not the protrusion come, avoided scraping to destroy second rete 7, lithium ion battery's explosion-proof ability is showing the reinforcing, can be in the face of the various circumstances that lithium ion battery produced in the use, simple structure, reasonable in design, easily production.
Claims (9)
1. The utility model provides a lithium ion battery explosion-proof equipment, its characterized in that includes apron (1), is equipped with convex cover (2) on apron (1), convex cover (2) surface be equipped with through-hole (3), convex cover (2) internal cover has rete (5), rete (5) cover through-hole (3) surface.
2. The explosion-proof device for the lithium ion battery according to claim 1, characterized in that the inner surface of the convex cover (2) is provided with a hollow cylinder (4), and the height of the top surface of the hollow cylinder (4) is lower than the height of the upper surface of the cover plate (1).
3. The explosion-proof device for the lithium ion battery according to claim 2, characterized in that the height of the top surface of the hollow cylinder (4) is higher than the highest height of the through hole (3) in the convex cover (2).
4. The explosion-proof device for the lithium ion battery according to claim 1, wherein the film layer (5) comprises a first film layer (6) and a second film layer (7), the first film layer (6) is in contact with the inner surface of the convex cover (2) and covers the surface of the through hole (3), and the second film layer (7) covers the surface of the first film layer (6).
5. The explosion-proof device for the lithium ion battery according to claim 1, wherein the distance between the through hole (3) and the upper surface of the cover plate (1) is 0.2-2 mm.
6. The explosion-proof device for the lithium ion battery according to claim 4, wherein the first film layer (6) covers the top surface of the hollow cylinder (4), and the surface of the second film layer (7) is flush with the upper surface of the cover plate (1).
7. The lithium ion battery explosion protection device according to claim 4 or 6, wherein the melting point or transition viscous state temperature range of the second film layer (7) is 100-180 ℃.
8. The explosion-proof device for lithium ion battery according to any one of claims 1 to 6, wherein the main component of the cover plate (1) is one of PE, HDPE, PMMA, PP and PVC, and the starting temperature of the cover plate (1) starting to transform into viscous state is in the range of 100 ℃ to 180 ℃.
9. An explosion-proof lithium ion battery, characterized in that, comprising the explosion-proof device of lithium ion battery as claimed in any one of claims 1-8, the side of the convex cover (2) covered with the film layer (5) is placed outside the battery.
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| CN201920654559.4U CN209860040U (en) | 2019-05-08 | 2019-05-08 | Lithium ion battery explosion-proof device and explosion-proof lithium ion battery |
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| CN201920654559.4U CN209860040U (en) | 2019-05-08 | 2019-05-08 | Lithium ion battery explosion-proof device and explosion-proof lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112346A (en) * | 2019-05-08 | 2019-08-09 | 安徽泰能新能源科技有限公司 | A kind of lithium-ion battery explosion-proof device and its production method and anti-explosion lithium ion battery |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112346A (en) * | 2019-05-08 | 2019-08-09 | 安徽泰能新能源科技有限公司 | A kind of lithium-ion battery explosion-proof device and its production method and anti-explosion lithium ion battery |
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