CN114156530A - Lithium ion battery assembly and casting method - Google Patents
Lithium ion battery assembly and casting method Download PDFInfo
- Publication number
- CN114156530A CN114156530A CN202111501921.2A CN202111501921A CN114156530A CN 114156530 A CN114156530 A CN 114156530A CN 202111501921 A CN202111501921 A CN 202111501921A CN 114156530 A CN114156530 A CN 114156530A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- encapsulation
- battery
- pouring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005266 casting Methods 0.000 title claims description 8
- 238000005538 encapsulation Methods 0.000 claims abstract description 80
- 150000001875 compounds Chemical class 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims description 29
- 238000004382 potting Methods 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000008393 encapsulating agent Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 13
- 238000009413 insulation Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 8
- 239000002360 explosive Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a lithium ion battery pack and a pouring sealing method, wherein at least one lithium ion battery is arranged in a box in a hollow manner, and a pouring sealing space is formed between the lithium ion battery and the inner side wall and the bottom of the box; and injecting the pouring compound into the box body at one time, and filling gaps among the batteries and the box body until the pouring surface reaches the specified height. The lithium ion battery encapsulation scheme provided by the invention can realize that one or more batteries and accessory parts are all encapsulated in the compound by one-time encapsulation, so that multiple indexes of encapsulation thickness of different parts of the batteries, insulation with a battery box and the like meet standard requirements, the encapsulation process is simplified, and the encapsulation quality and efficiency are greatly improved.
Description
Technical Field
The invention relates to the field of batteries, in particular to a lithium ion battery encapsulation technology.
Background
The lithium ion battery has the advantages of high energy density, stable discharge characteristic and long cycle life, and is widely used as a power supply of various devices. When the lithium ion battery is in use, due to misuse and abuse abnormal conditions such as overcharge, overdischarge, high temperature, short circuit, mechanical impact and the like, destructive exothermic chemical reaction occurs inside the lithium ion battery, and the generated heat exceeds the heat dissipation speed of the lithium ion battery, the heat can be rapidly accumulated inside the lithium ion battery and generates pressure, so that the speed of the chemical reaction inside the lithium ion battery is accelerated, and then a vicious circle is formed to make the failure condition more serious. If the process cannot be relieved in time, the lithium battery can generate thermal runaway until the battery is broken, releases a large amount of combustible and toxic gases, and fires and explodes. Therefore, in the design process of the lithium ion battery, a safety valve is usually arranged between the positive pole and the negative pole, and the safety valve is used as an important safety device to relieve the deterioration process when the lithium ion battery fails, so that serious accidents are avoided. Therefore, the safety valve is guaranteed to be reliably opened, and the safety valve plays a crucial role in the safety of the lithium battery.
In addition, in the lithium ion battery applied to explosive environments (such as coal mines, chemical enterprises and the like), the battery surface, the pole column temperature, the exposed charged part and the like can become an ignition source under abnormal conditions to ignite the explosive environment.
In order to prevent the lithium ion battery from becoming an ignition source in an explosive environment, various explosion-proof types can be adopted, wherein the encapsulation type is a common mode. According to the requirements of GB3836.9 standard, not only the thickness of the encapsulation is ensured, but also various properties of the encapsulation compound are ensured. However, since the battery post and the connecting piece are higher than the safety valve, if the battery post and the connecting piece are cast according to the requirement of protecting the battery post and the connecting piece, the cast layer of the safety valve is very thick, so that the safety valve cannot be opened when the safety valve needs to be opened.
The existing method generally comprises two or more times of pouring, firstly pouring a pouring compound into a box body for accommodating the battery and reaching the specified height, then loading the battery, blocking the position of a safety valve, pouring the pouring compound again to pour the battery, and finally trying to pour a layer on the upper part of the safety valve, so that the pouring layer of the safety valve has the thickness required by the standard mask, and the opening of the safety valve is not influenced. The existing pouring and sealing process is complex and low in efficiency, and the joint surfaces of multiple pouring and sealing are probably not fused to form an isolation layer, so that the pouring and sealing quality is difficult to ensure.
Disclosure of Invention
Aiming at the problems of complex process and low efficiency of the existing lithium ion battery encapsulation scheme applied to explosive environment, the invention aims to provide the lithium ion battery encapsulation scheme, which realizes one-time encapsulation of the lithium ion battery, has high efficiency and high quality, meets the encapsulation requirement specified by the standard and does not influence the opening of a safety valve.
In order to achieve the above object, the present invention provides a lithium ion battery assembly, which comprises a case, a support assembly, at least one lithium ion battery, a protective cover and a potting compound;
the supporting assembly is arranged in the box body to form a lithium ion battery placing area;
the at least one lithium ion battery is arranged in an arrangement area formed by the support component, and a pouring space is formed between the at least one lithium ion battery and the inner side wall and the bottom of the box body;
the protective cover is arranged on a safety valve of the lithium ion battery;
the pouring and sealing compound is poured into the box body at one time and fills gaps among the battery, the box body and the battery, and the pouring and sealing body is formed by one-time forming and covers the whole outer surface of the lithium ion battery.
Furthermore, the protective cover comprises a cover body and a cover plate, the cover body is of a through hole structure and can be covered on a safety valve of the lithium ion battery, and the cover plate is detachably arranged on the cover body.
Furthermore, the one-step molded encapsulation body also covers the charged part and the exposed metal piece on the lithium ion battery.
Further, the support assembly may form a seating area of the overhead structure within the enclosure.
Further, the support assembly is of an insulating structure as a whole.
Furthermore, a partition board is arranged between the adjacent lithium ion batteries.
Further, the potting compound is injected into the case in which at least one lithium ion battery is disposed at a time.
In order to achieve the above object, the present invention provides a method for encapsulating a lithium ion battery, the method comprising:
at least one lithium ion battery is arranged in the box in an overhead mode, and a pouring space is formed among the lithium ion battery, the inner side wall and the bottom of the box;
and injecting the pouring compound into the box body at one time, and filling gaps among the batteries and the box body until the pouring surface reaches the specified height.
Furthermore, according to the pouring sealing method, a protective cover is arranged on a safety valve of each lithium ion battery, and an openable protective cavity is formed for the safety valve.
Further, the encapsulation method arranges a separator between adjacent lithium ion batteries.
Further, the encapsulation method is to encapsulate all of the battery surface, charged part, and bare metal member in an encapsulation compound by completing encapsulation at one time.
Furthermore, the pouring compound adopts organic silicon pouring sealant.
The lithium ion battery encapsulation scheme provided by the invention can realize that one or more batteries and accessory parts are all encapsulated in the compound by one-time encapsulation, so that multiple indexes of encapsulation thickness of different parts of the batteries, insulation with a battery box and the like meet standard requirements, the encapsulation process is simplified, and the encapsulation quality and efficiency are greatly improved.
The lithium ion battery encapsulation scheme has important significance and wide application prospect particularly for large lithium ion battery power supplies comprising dozens to hundreds of single lithium ion batteries.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is an exploded view of an assembly of a lithium ion battery case according to an embodiment of the present invention;
FIG. 2 is an assembled cross-sectional view of a lithium ion battery case in an embodiment of the present invention;
FIG. 3 is a schematic view of a battery holder according to an embodiment of the present invention;
FIG. 4 is a schematic view of a battery support bar according to an embodiment of the present invention;
FIG. 5 is a schematic view of a safety valve shield in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a lithium ion battery case according to an embodiment of the present invention after being encapsulated;
FIG. 7 is a diagram showing the effect of one-time encapsulation of 10 lithium ion batteries in an example of the present invention;
fig. 8 is a diagram showing the effect of one-time encapsulation of 50 lithium ion batteries in the example of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Lithium ion batteries are widely used as power supplies of various devices, instruments and the like, but the lithium ion battery power supplies used in explosive environments (such as coal mines, chemical enterprises, explosive dust places and the like) must meet the explosion-proof requirement; because the requirements of various standards on the structure and the like of a lithium ion battery power supply are not specific at present, the adoption of a comprehensive explosion-proof protection type (the explosion-proof type comprises an explosion-proof type, an intrinsic safety type, a pouring type, an increased safety type, an oil immersion type, a sand filling type and the like) is probably the development direction of the future, wherein the pouring type is probably the most promising explosion-proof protection type in the future.
Encapsulation requires that the battery and its external connection members and the like are all sealed in an encapsulation compound to have a certain thickness, strength and the like, and that the battery be insulated from the case in which the battery is housed. Further, in the case of the compound for use in the potting type, since the epoxy resin has high hardness after curing, epoxy resin potting is currently used in many cases, but it is difficult to disassemble the battery encapsulated with this potting.
Moreover, the voltage structure and types of the lithium ion battery are various, and the lithium ion battery can generate thermal runaway under abnormal conditions, and even can generate explosion and fire along with rapid pressure release. The safety valve is a weak link of the lithium ion battery, and when the pressure rises to a set value, the safety valve is opened to release the pressure, so that the expansion of a thermal runaway consequence is avoided. Because the height of the battery post after the connecting piece is added is higher than that of the safety valve, if the battery is fully cast, the casting thickness of the upper part of the safety valve after casting is very thick, and the safety valve can lose the pressure release function. Meanwhile, the encapsulation of the periphery and the bottom of the battery is also difficult.
In order to solve such a problem, multiple potting is currently generally adopted. It is generally necessary to perform the next encapsulation after the last encapsulation is cured. The multiple-time pouring process is complex and low in efficiency, and joint surfaces of two times of pouring can not be fused together to form an isolation layer, so that the pouring strength, protection and the like are not satisfactory.
Therefore, the invention provides a lithium ion battery encapsulation scheme, which realizes that the battery and accessory parts are all encapsulated in the compound through one-time encapsulation, so that multiple indexes of encapsulation thickness, insulation with a battery box and the like of different parts of the battery meet standard requirements, thereby simplifying the encapsulation process and improving the encapsulation quality and efficiency.
Specifically, according to the lithium ion battery encapsulation scheme, the lithium ion battery to be encapsulated is arranged in the box body in an overhead structure, and an encapsulation space is formed between the lithium ion battery and the inner side wall and the bottom of the box body; meanwhile, a protective cover is arranged on the safety valve of each lithium ion battery so as to form an openable protective cavity in the safety valve.
On the basis, the pouring compound is poured into the box body at one time, and gaps among the batteries and the box body and the batteries are filled until the pouring surface reaches the specified height. Therefore, one or more lithium ion batteries can be encapsulated by one-time encapsulation, the encapsulation thickness of the lithium ion batteries meets the standard requirements, the encapsulation process is simplified, and the production efficiency is improved.
When the lithium ion battery encapsulation scheme is specifically implemented, the invention also provides a lithium ion battery box scheme, and the lithium ion battery box can be matched with the lithium ion battery one-time encapsulation scheme provided by the invention.
Referring to fig. 1 and 2, an exemplary embodiment of a lithium ion battery case according to the present invention is shown.
As can be seen from the figure, the lithium ion battery box in the present exemplary embodiment is mainly formed by matching a box body 8, a box cover 1, a plurality of lithium ion batteries 4, a protective cover 2, a fixing frame 6, and a supporting strip 7.
Wherein, the box body 8 and the box cover 1 are matched to form a box body assembly which is used for forming a placing space and bearing other components. The specific structure of the box 8 and the box cover 1 is not limited herein, and may be determined according to actual requirements.
In the illustrated embodiment, the box 8 is of a square structure and has a flange formed at its end for fixedly connecting to the box cover 1.
In the present exemplary embodiment, the fixing frame 6 and the supporting bar 7 are adopted to cooperate to form a corresponding supporting assembly in the box body 8, so as to be used for placing the lithium ion battery 4, and thus the lithium ion battery is arranged in the box body in a hollow manner, and a pouring space is formed between each lithium ion battery and the inner side wall and the bottom of the box body.
The fixing frame 6 is matched with the number of the lithium ion batteries 4 to be assembled to form a corresponding placing area, and the lithium ion batteries 4 to be assembled are placed to fix the placing positions of the lithium ion batteries 4. Meanwhile, certain limit is formed on the lithium ion battery 4 to be assembled so as to ensure the reliability of subsequent pouring.
Referring to fig. 3, there is shown an example of the construction of the fixing frame 6 employed in the present example. The fixing frame 6 is a square frame structure composed of four side plates, and a plurality of slots 62 are formed in the bottom of each side plate 61, so that corresponding potting compound can flow through the slots 62 during potting.
The arrangement of the slots 62 at the bottom of the fixing frame 6, such as size, shape, and distribution, is not limited herein, and may be determined according to actual requirements. By way of example, the illustrated embodiment employs an equally spaced circular arc slotted configuration.
The fixing frame 6 is made of a non-metal insulating material or a metal material in a specific implementation. When a metal material is used, the surface in contact with the battery is covered with an insulating layer or isolated with an insulating material.
On the basis of the above-mentioned fixing frame 6 solution, in the present exemplary embodiment, a corresponding supporting strip 7 is disposed in the mounting area formed by the fixing frame 6 for supporting the lithium ion battery 4 to be assembled, so that the lithium ion battery 4 to be assembled does not contact with the bottom of the case, and a pouring space is formed between the two.
Referring to fig. 4, there is shown an example of the construction of the support strip 7 employed in the present example. The supporting bar 7 is of a strip-shaped structure, the thickness of the supporting bar 7 and the thickness of the encapsulation layer that needs to be formed at the bottom of the lithium ion battery 4 are determined according to actual requirements, and the length and the width of the supporting bar 7 are not limited herein.
On the basis, the flow guide grooves 71 are formed at the bottom of the supporting bar 7 in the present exemplary embodiment, so that the potting compound flows and fills at the bottom of the lithium ion battery 4 during potting.
The arrangement, such as size, shape and distribution, of the flow guide grooves 71 at the bottom of the support bars 7 is not limited, and may be determined according to actual requirements. By way of example, the illustrated solution employs a square groove structure equally spaced perpendicular to the extension direction of the support bars 7.
The support bar 7 is made of an insulating material in a specific implementation.
The stay 7 thus configured is fitted with the holder 6, and the holder 6 having a groove at the bottom is attached to a predetermined position in the battery case 8.
Further, grooved support bars 7 are to be mounted within the holder 6. Here, the number of the support bars 7 may be determined according to the number of the lithium ion batteries 4 to be assembled.
By way of example, preferably, the support bars 7 are arranged in two groups in parallel in the fixing frame 6, and the support bars 7 in each group are arranged in sequence along the length direction (as shown in fig. 1).
In order to ensure the stability of the lithium ion batteries 4 arranged in the subsequent row, the support bars 7 are preferably fixed in a fixed position in the fixing frame 6 in an adhesive manner with the grooved surface facing downwards, but the invention is not limited to this fixed arrangement mode.
The fixing frame 6 and the supporting strip 7 inside the fixing frame are matched to form a corresponding supporting assembly, so that the lithium ion battery 4 to be assembled is placed and supported, the placing position of the lithium ion battery 4 to be assembled is fixed through the fixing frame 6, meanwhile, the supporting strip 7 at the bottom is used for supporting the lithium ion battery 4 to be assembled, the lithium ion battery 4 to be assembled is arranged in the box body 8 in an overhead structural mode, the lithium ion battery 4 to be assembled is not in contact with the bottom of the box body, and a pouring sealing space is formed between the two.
Here, in the case of the encapsulation, the injected encapsulation compound can flow and fill at the bottom of the lithium ion battery 4 through the slots at the bottom of the fixing frame 6 and the guiding grooves 71 at the bottom of the supporting bars 7, so that an encapsulation layer with a desired thickness can be formed.
In the present exemplary embodiment, a protective cover 2 is further respectively disposed for the safety valve on the lithium ion battery 4, and is used to control the molding thickness of the corresponding potting compound on the lithium ion battery safety valve during one-time potting, so as to ensure that the ion battery safety valve functions normally and can work normally.
The protective cover 2 is sleeved on the safety valve on each lithium ion battery 4 so as to form an openable protective cavity around the safety valve, so that when pouring, the poured pouring compound can not flow through the safety valve due to the protection of the protective cavity and only can form a corresponding pouring layer outside the protective cavity; on this basis come the effective control at the thickness of the encapsulation layer that the protection chamber formed outside the protection chamber through the protection chamber height, like this when the relief valve was opened, the pressure in the protection chamber increased, can effectively back open the protection chamber under the pressure effect and cover the encapsulation layer that waters above that, guaranteed safety protection's effect, did not influence the efficiency of relief valve completely.
Referring to fig. 5, there is shown an example of the constitution of the protection mask 2 employed in the present example. The protective cover 2 is mainly formed by matching a cover body 21 and a cover cap 22.
The cover body 21 is of a hollow structure and is communicated with the upper part and the lower part, the bottom port is used for covering the safety valve, and the top port is matched with the cover cap 22 to realize a detachable blocking structure.
The configuration of the cover 21 is not limited, and the shape and the inner size may be set as needed, and may be, for example, a cylindrical shape, an elliptic cylindrical shape, a square shape, or the like. The height of the cover 21 is determined according to the height after potting.
Taking the scheme shown in fig. 5 as an example, the cover body 21 is provided with a hollow cylindrical shape as a whole, and corresponding flange structures are arranged at two ports so as to facilitate the assembly, arrangement and fixation of the safety valve. Meanwhile, a corresponding counter bore structure is formed at the top port of the cover body 21 and used for placing the cover 22, so that the cover 22 is integrally embedded in the port of the cover body 21, and when plugging is realized, the whole body is flush with the end face of the cover body 21, and the reliability in subsequent pouring is ensured.
The closure 22 in this example embodiment integrally mates with the top port of the body 21 to provide a seal to the port and form a protective cavity within the body 21 to prevent potting compound from flowing into the body 21.
The design of the cover 22 is not limited and can be determined according to the actual requirements. Also taking the solution shown in fig. 5 as an example, the cover 22 in this example adopts a disc structure in cooperation with the structure of the cover body 21.
The protection cover 2 formed by matching the cover body 21 and the cover cap 22 according to the scheme of the example is covered on the safety valve through the cover body 21, the upper part of the cover body 21 is blocked by the cover cap 22, the protection cover 2 is integrally covered on the upper part of the battery safety valve, and a protection cavity is formed around the safety valve.
When the potting is performed in this way, the potting compound injected cannot enter the cover body 21 due to the sealing of the cap 22, and a corresponding potting layer is formed on the outside of the shield 2, and the thickness of the formed potting layer can be adjusted by the height of the cover body 21. Therefore, when the safety valve is opened, the pressure in the protective cavity is increased, the cover 22 at the top of the cover body 21 and the pouring sealing layer covering the cover can be effectively jacked open under the action of the pressure, the safety protection effect is ensured, and the efficiency of the safety valve is not influenced completely.
In the assembly of the plurality of lithium ion batteries 4 in the present exemplary embodiment, the lithium ion batteries 4 are mounted in the fixing frame 6 and arranged on the supporting bars 7 (as shown in fig. 1 and 2).
On the basis, the partition plates 5 are inserted between the adjacent lithium ion batteries 4, so that the adjacent lithium ion batteries 4 are not in direct contact, and the insulation and heat insulation between the adjacent lithium ion batteries 4 are realized.
The separator 5 is preferably a flat plate structure made of a non-metallic material, and the length and width of the separator are matched with the corresponding lithium ion battery 4 to realize insulation and heat insulation between adjacent batteries.
In the present exemplary embodiment, after the plurality of lithium ion batteries 4 are arranged and assembled in the fixing frame 6 of the box body, the lithium ion batteries are further connected with the positive electrode and the negative electrode of the lithium ion batteries through the battery connecting sheet 3 to form the battery pack.
The configuration of the battery connecting plate 3 is not limited and may be determined according to actual requirements.
Meanwhile, the specific connection combination mode is not limited, and can be determined according to actual requirements. By way of example, a plurality of lithium ion batteries 4 may be connected in series or in parallel to form a battery pack.
In addition, the protective cover 2 of the safety valve on each lithium ion battery 4 can be arranged before each lithium ion battery 4 is assembled; the lithium ion batteries 4 may be arranged after being assembled according to the need, and may be specifically set according to the actual need.
In practical application, the lithium ion battery box provided by the exemplary scheme is assembled according to the scheme before being cast.
After assembly, the prepared potting compound can be directly injected into the housing until the potting surface reaches a specified height. By completing the encapsulation in one step in this way, the entire surface of the battery, charged portion, and bare metal member are enclosed in the encapsulation compound.
And after the pouring sealing compound is cured, fixedly connecting the box cover 1 with the box body 8 in a sealing manner to form the final lithium ion battery box.
For the encapsulation compound, the organic silicon pouring sealant is preferably adopted in the embodiment, so that the encapsulation compound can be unsealed after encapsulation, and the battery can be conveniently used in a gradient manner.
According to the scheme of the lithium ion battery box, the fixing frame with the groove at the bottom is arranged in the battery box, the battery supporting bar with the groove at the bottom is arranged in the fixing frame, the protective cover is arranged at the upper part of the safety valve, and the pouring compound is injected into the battery box only once, so that all surfaces, charged parts, exposed metal parts and the like of the battery can be poured in the pouring compound, the pouring thickness and the like of the lithium ion battery meet standard requirements, the pouring requirements specified by the standard are met, the pouring process is simplified, the production efficiency is improved, and meanwhile, the opening of the safety valve is not influenced.
The following describes an embodiment of primary encapsulation of a lithium ion battery based on the above-described lithium ion battery box.
Before formal encapsulation, material preparation is carried out based on the battery box scheme to form a corresponding box body 8, a box cover 1, a protective cover 2, a battery connecting sheet 3, a partition plate 5, a fixing frame 6, a supporting strip 7 and a lithium ion battery 4 to be assembled and packaged.
With reference to fig. 1 and 2, the lithium ion battery encapsulation process is as follows:
1) the battery holder 6 is placed in the battery box 8 with the grooved side facing downwards.
In the embodiment, the fixing frame is made of metal, the periphery of the fixing frame is welded at a specified position in the box body in a spot welding mode, and the epoxy resin plate is adhered to the inner surface (the surface contacting with the battery) of the fixing frame and used for insulating the battery.
2) The battery support bar 7 is pasted at a specified position in the fixing frame 6, and the end part with the pouring compound diversion trench is arranged downwards.
The length of the support bars is determined according to actual needs, and a plurality of battery support bars 7 are distributed in the fixing frame 6 in two rows in parallel. When the lithium ion batteries 4 are matched for assembly, two supporting strips at the bottom of each lithium ion battery 4 are realized.
3) A plurality of lithium ion batteries 4 are sequentially arranged on the supporting bars 7 in the fixing frame. Therefore, the lithium ion batteries 4 are arranged in the box in an overhead manner, a casting space is formed between each lithium ion battery 4 and the inner side wall and the bottom of the box 8, and the size of the space can be determined according to actual index requirements.
4) Separators 5 are interposed between the adjacent lithium ion batteries 4 to insulate and insulate the adjacent lithium ion batteries 4 from each other.
5) The safety valve on each lithium ion battery 4 is sleeved with a corresponding protective cover 2.
Here, the flat bottom surface of the safety valve protective cover 2 is stuck on the upper part of the safety valve, and a cover is covered on the safety valve protective cover so as to form a protective cavity around the safety valve.
6) According to the design requirement, a plurality of lithium ion batteries 4 are connected (such as in series or in parallel) through battery connecting sheets 3 to form a battery pack.
7) Injecting a potting compound into the battery box, wherein the potting compound flows in through the gaps between the batteries and the box body; and meanwhile, the battery can be filled into the bottom of the battery in a flowing manner from the fixed frame, the slotted groove or the diversion groove at the bottom of the supporting bar and the like. Thus, the potting compound is automatically filled through the gaps between the batteries, the gaps between the batteries and the case, the fixing frame, the grooves of the support bars, and the like. Along with the increase of the injected casting compound, the liquid level rises from bottom to top until the battery pole connecting piece and the protective cover are submerged, and the injection of the casting compound is stopped after the specified height is reached.
8) After the potting compound is cured and molded, the case cover 1 is connected with the case body 8 through the connecting bolt, and the case body 8 is sealed, so that a final lithium ion battery case (as shown in fig. 6) is obtained.
Thus, the encapsulation of the battery is completed at one time, the surface, charged parts and bare metal parts of the battery are all sealed in the encapsulation compound, any secondary or multiple encapsulation is not needed, the encapsulation thickness of the lithium ion battery can meet the standard requirement through one-time encapsulation, the encapsulation process is simplified, and the production efficiency is improved.
Referring to fig. 7, an effect diagram of performing primary encapsulation of 10 lithium ion batteries based on the present method for primary encapsulation of lithium ion batteries is shown.
Referring to fig. 8, it shows the effect of performing one-time encapsulation of 50 lithium ion batteries based on the one-time encapsulation method of the lithium ion battery.
Therefore, based on the lithium ion battery encapsulation scheme provided by the invention, the battery and the accessory parts can be completely encapsulated in the compound through one-time encapsulation, so that multiple indexes of encapsulation thickness of different parts of the battery, insulation with a battery box and the like meet standard requirements, the encapsulation process is simplified, the encapsulation quality and efficiency are improved, and the encapsulation method has important significance particularly on large lithium ion battery power supplies (comprising dozens to hundreds of single lithium ion batteries) and has wide application prospect.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (12)
1. A lithium ion battery component is characterized by comprising a box body, a supporting component, at least one lithium ion battery, a protective cover and a casting compound;
the supporting assembly is arranged in the box body to form a lithium ion battery placing area;
the at least one lithium ion battery is arranged in an arrangement area formed by the support component, and a pouring space is formed between the at least one lithium ion battery and the inner side wall and the bottom of the box body;
the protective cover is arranged on a safety valve of the lithium ion battery;
the pouring and sealing compound is poured into the box body at one time and fills gaps among the battery, the box body and the battery, and the pouring and sealing body is formed by one-time forming and covers the whole outer surface of the lithium ion battery.
2. The lithium ion battery assembly of claim 1, wherein the protective cover comprises a cover body and a cover plate, the cover body is in a through hole structure and can cover a safety valve of the lithium ion battery, and the cover plate is detachably arranged on the cover body.
3. The lithium ion battery assembly of claim 1, wherein the one-shot molded encapsulant further covers live sites, bare metal parts on the lithium ion battery.
4. The lithium ion battery assembly of claim 1, wherein the support assembly forms a seating region of an overhead structure within the enclosure.
5. The lithium ion battery assembly of claim 1, wherein the support assembly is an integral insulating structure.
6. The lithium ion battery assembly of claim 1, wherein a separator is disposed between adjacent lithium ion batteries.
7. The lithium ion battery assembly of claim 1, wherein the potting compound is injected at one time into a housing in which at least one lithium ion battery is disposed.
8. A lithium ion battery encapsulation method is characterized by comprising the following steps:
at least one lithium ion battery is arranged in the box in an overhead mode, and a pouring space is formed among the lithium ion battery, the inner side wall and the bottom of the box;
and injecting the pouring compound into the box body at one time, and filling gaps among the batteries and the box body until the pouring surface reaches the specified height.
9. The lithium ion battery encapsulation method according to claim 8, wherein the encapsulation method is characterized in that a protective cover is arranged on the safety valve of each lithium ion battery, and an openable protective cavity is formed for the safety valve.
10. The lithium ion battery encapsulation method according to claim 8, wherein the encapsulation method provides a separator between adjacent lithium ion batteries.
11. The method of claim 8, wherein the encapsulation is performed in a single step to encapsulate all of the battery surface, charged sites, and bare metal parts in an encapsulation compound.
12. The method for encapsulating the lithium ion battery according to claim 8, wherein the encapsulating compound is an organic silicon encapsulating compound.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111501921.2A CN114156530B (en) | 2021-12-09 | 2021-12-09 | Lithium ion battery assembly and pouring method |
| PCT/CN2021/138204 WO2023102971A1 (en) | 2021-12-09 | 2021-12-15 | Lithium ion battery assembly and encapsulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111501921.2A CN114156530B (en) | 2021-12-09 | 2021-12-09 | Lithium ion battery assembly and pouring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114156530A true CN114156530A (en) | 2022-03-08 |
| CN114156530B CN114156530B (en) | 2024-07-30 |
Family
ID=80454312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111501921.2A Active CN114156530B (en) | 2021-12-09 | 2021-12-09 | Lithium ion battery assembly and pouring method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114156530B (en) |
| WO (1) | WO2023102971A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022113602A1 (en) | 2022-05-30 | 2023-11-30 | Audi Aktiengesellschaft | Battery cell arrangement with a casting compound layer and method for producing a battery cell arrangement for a motor vehicle |
| DE102023102031A1 (en) | 2023-01-27 | 2024-08-01 | Bayerische Motoren Werke Aktiengesellschaft | ENERGY STORAGE FOR MOTOR VEHICLES, MOTOR VEHICLES AND MANUFACTURING PROCESSES FOR THE ENERGY STORAGE |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1939956A1 (en) * | 2006-12-28 | 2008-07-02 | Sanyo Electric Co., Ltd. | Battery pack |
| CN203218359U (en) * | 2013-04-19 | 2013-09-25 | 宁德新能源科技有限公司 | Pressure releasing valve and power battery top cover |
| WO2015169526A2 (en) * | 2014-05-06 | 2015-11-12 | Robert Bosch Gmbh | Insulating of adjacent lithium-ion batteries by complete overmoulding/pouring of containers in a device |
| US20160211496A1 (en) * | 2015-01-20 | 2016-07-21 | Hong-Wen Hwang | Secondary battery assembly with enhanced protection |
| CN209730030U (en) * | 2019-04-16 | 2019-12-03 | 上海申传电气股份有限公司 | A kind of synthesis explosion-proof protection structure of lithium battery power supply |
| CN212907967U (en) * | 2020-07-14 | 2021-04-06 | 华瑞矿业科技有限公司 | Explosion-proof battery module |
| CN212991229U (en) * | 2020-07-14 | 2021-04-16 | 华瑞矿业科技有限公司 | Explosion-proof battery |
| CN215266568U (en) * | 2021-05-11 | 2021-12-21 | 华瑞矿业科技有限公司 | Explosion-proof battery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210182427U (en) * | 2019-04-16 | 2020-03-24 | 上海申传电气股份有限公司 | Cast-in explosion-proof structure of lithium battery power supply |
-
2021
- 2021-12-09 CN CN202111501921.2A patent/CN114156530B/en active Active
- 2021-12-15 WO PCT/CN2021/138204 patent/WO2023102971A1/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1939956A1 (en) * | 2006-12-28 | 2008-07-02 | Sanyo Electric Co., Ltd. | Battery pack |
| CN203218359U (en) * | 2013-04-19 | 2013-09-25 | 宁德新能源科技有限公司 | Pressure releasing valve and power battery top cover |
| WO2015169526A2 (en) * | 2014-05-06 | 2015-11-12 | Robert Bosch Gmbh | Insulating of adjacent lithium-ion batteries by complete overmoulding/pouring of containers in a device |
| US20160211496A1 (en) * | 2015-01-20 | 2016-07-21 | Hong-Wen Hwang | Secondary battery assembly with enhanced protection |
| CN209730030U (en) * | 2019-04-16 | 2019-12-03 | 上海申传电气股份有限公司 | A kind of synthesis explosion-proof protection structure of lithium battery power supply |
| CN212907967U (en) * | 2020-07-14 | 2021-04-06 | 华瑞矿业科技有限公司 | Explosion-proof battery module |
| CN212991229U (en) * | 2020-07-14 | 2021-04-16 | 华瑞矿业科技有限公司 | Explosion-proof battery |
| CN215266568U (en) * | 2021-05-11 | 2021-12-21 | 华瑞矿业科技有限公司 | Explosion-proof battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022113602A1 (en) | 2022-05-30 | 2023-11-30 | Audi Aktiengesellschaft | Battery cell arrangement with a casting compound layer and method for producing a battery cell arrangement for a motor vehicle |
| DE102023102031A1 (en) | 2023-01-27 | 2024-08-01 | Bayerische Motoren Werke Aktiengesellschaft | ENERGY STORAGE FOR MOTOR VEHICLES, MOTOR VEHICLES AND MANUFACTURING PROCESSES FOR THE ENERGY STORAGE |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023102971A1 (en) | 2023-06-15 |
| CN114156530B (en) | 2024-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20240204309A1 (en) | Battery top cover and battery | |
| CN114156530B (en) | Lithium ion battery assembly and pouring method | |
| JP7492583B2 (en) | BATTERY, BATTERY MODULE, BATTERY PACK, AND ELECTRIC VEHICLE | |
| US5876873A (en) | Sealed lead-acid cells and batteries having internal and external restraint for accommodating plate growth | |
| CN110400895A (en) | Battery module, secondary battery and top cover assembly thereof | |
| WO2022012378A1 (en) | Explosion-proof battery | |
| KR20040033030A (en) | A bipolar battery and a biplate assembly | |
| KR102684448B1 (en) | Batteries and related devices, manufacturing methods and manufacturing devices | |
| KR20160129596A (en) | Battery pack and method for manufacturing the same | |
| WO2021020003A1 (en) | Battery pack | |
| KR100537535B1 (en) | Method of forming plastic molding type secondary battery | |
| EP4064449B1 (en) | Box body for battery, battery, electric apparatus, and battery manufacturing method and device | |
| CN207124213U (en) | A kind of battery container, battery cover board and battery | |
| CN219610594U (en) | Top cap subassembly and battery | |
| KR101329830B1 (en) | Secondary battery | |
| KR20080087345A (en) | Rechargeable battery | |
| CN112002855B (en) | Explosion-proof battery | |
| KR100624968B1 (en) | Cap Assembly and Lithium ion Secondary Battery with the same | |
| JP2023542791A (en) | Batteries, power utilization devices, battery preparation methods, and equipment | |
| KR20130134951A (en) | Secondary battery | |
| KR100561293B1 (en) | Secondary Battery | |
| CN221150192U (en) | Power battery | |
| CN213905552U (en) | Battery cover plate assembly and lithium ion battery | |
| CN220856717U (en) | Battery cover plate and battery | |
| KR20150089540A (en) | Replaceable Pack Applying Hot-Melt Resin And Manufacturing Method Thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |