CN117393966B - Repair device for large-capacity battery, repair bin and large-capacity battery - Google Patents
Repair device for large-capacity battery, repair bin and large-capacity battery Download PDFInfo
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- CN117393966B CN117393966B CN202311703621.1A CN202311703621A CN117393966B CN 117393966 B CN117393966 B CN 117393966B CN 202311703621 A CN202311703621 A CN 202311703621A CN 117393966 B CN117393966 B CN 117393966B
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- inner core
- shell
- sub
- capacity battery
- electrolyte
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- 230000008439 repair process Effects 0.000 title claims description 65
- 239000003792 electrolyte Substances 0.000 claims abstract description 111
- 238000003860 storage Methods 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 239000000654 additive Substances 0.000 abstract description 26
- 230000000996 additive effect Effects 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 53
- 229910052744 lithium Inorganic materials 0.000 description 53
- 239000007789 gas Substances 0.000 description 20
- 230000001502 supplementing effect Effects 0.000 description 19
- 239000013589 supplement Substances 0.000 description 16
- 230000009469 supplementation Effects 0.000 description 15
- 238000003466 welding Methods 0.000 description 8
- 238000004880 explosion Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000013022 venting Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000002000 Electrolyte additive Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002482 conductive additive Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/70—Arrangements for stirring or circulating the electrolyte
- H01M50/77—Arrangements for stirring or circulating the electrolyte with external circulating path
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4214—Arrangements for moving electrodes or electrolyte
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
-
- 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
Abstract
The invention belongs to the field of batteries, and particularly relates to a repairing device for a high-capacity battery, a repairing bin and the high-capacity battery. The additive can be conveniently, quickly, regularly and quantitatively supplemented to the high-capacity battery in the charge-discharge cycle process. The repairing device sequentially comprises an inner core, a sealing component and an outer shell which are coaxially sleeved from inside to outside; the inner core comprises a first sub-inner core and a second sub-inner core, the first sub-inner core is in clearance fit with the side wall of the shell, and at least two mutually independent storage chambers are formed between the second sub-inner core and the side wall of the shell; the sealing member is located between the first sub-core and the outer shell; the bottom of the second sub-inner core is tightly attached to the bottom of the shell, and a part of the shell corresponding to the second sub-inner core is provided with a first through hole and a second through hole which are used for communicating with the electrolyte sharing cavity of the high-capacity battery; under the action of external force, the inner core can rotate in the shell, so that the first through hole and the second through hole are communicated with different storage chambers.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a repairing device for a high-capacity battery, a repairing bin and the high-capacity battery.
Background
In the market, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also called a battery module or a battery pack).
Chinese patent CN 219144456U discloses a high-capacity battery, whose structure is shown in fig. 1, comprising several parallel single batteries and electrolyte sharing chambers at the bottom of each single battery; the electrolyte sharing chamber is used for completely penetrating the inner cavities of the plurality of single batteries so that all the single batteries in the large-capacity battery are in an electrolyte system. The high-capacity battery can strengthen the uniformity of the electrolyte of each single battery in the high-capacity battery through the electrolyte sharing chamber, improve the cycle life, supplement the electrolyte for the high-capacity battery through the electrolyte sharing chamber, prolong the service life of the high-capacity battery and improve the use safety of the high-capacity battery.
However, the high-capacity battery has a phenomenon that part of active lithium is lost at different stages during the charge and discharge cycle, so that the battery performance is reduced. The problem can be generally solved by adopting a mode of supplementing the lithium supplement additive, and the lithium deficiency phenomenon in the subsequent stage can be improved by adding excessive lithium supplement additive once in the stage of active lithium loss at first time, however, lithium precipitation of the negative electrode can be accelerated by adding excessive lithium supplement additive once, and lithium dendrite is formed on the surface of the negative electrode; the quantitative lithium supplement additive can be added at each stage, so that the problems can be overcome, but in each adding process, a large-capacity battery is required to be opened, and the operation is complicated; therefore, how to supplement the lithium supplement additive to the high-capacity battery simply, conveniently, quickly, regularly and quantitatively in the charge-discharge cycle process is a technical problem which needs to be solved at present.
Disclosure of Invention
The invention aims to provide a repairing device for a high-capacity battery, a repairing bin and the high-capacity battery, which can simply, conveniently, quickly, regularly and quantitatively supplement additives to the high-capacity battery in the charge-discharge cycle process.
The technical scheme of the invention is to provide a repairing device for a large-capacity battery, wherein the large-capacity battery comprises a plurality of unit batteries connected in parallel and an electrolyte sharing chamber, and the electrolyte sharing chamber is used for completely penetrating electrolyte areas in the inner cavities of the plurality of unit batteries; the special feature is that: the repairing device sequentially comprises an inner core, a sealing component and an outer shell which are coaxially sleeved from inside to outside;
the inner core comprises a first sub-inner core and a second sub-inner core, the first sub-inner core is in clearance fit with the side wall of the shell, and n mutually independent storage chambers are formed between the second sub-inner core and the side wall of the shell; wherein n is an integer greater than 1;
a sealing member located between the first sub-core and the outer shell for sealing a gap therebetween;
the shell is a barrel body with one open end, the bottom of the second sub-inner core is clung to the bottom of the shell, and a first through hole and a second through hole are formed in the shell corresponding to the second sub-inner core; the first through hole and the second through hole are both used for communicating with the electrolyte sharing cavity of the high-capacity battery;
under the action of external force, the inner core can rotate in the shell, so that the first through hole and the second through hole are communicated with different storage chambers.
According to the invention, according to different requirements of different phases on lithium supplementing amount in the charge-discharge cycle process of the high-capacity battery, different amounts of lithium supplementing additives are correspondingly added into each mutually independent storage cavity, so that each storage cavity corresponds to one lithium supplementing phase; in the use, at any lithium supplementing stage, the inner core is rotated, so that a target storage cavity corresponding to the lithium supplementing stage is communicated with the first through hole and the second through hole, electrolyte in the high-capacity battery is introduced into the first through hole and enters the storage cavity, flows out of the second through hole and enters the high-capacity battery again, and additives in the storage cavity can be quantitatively dissolved in the electrolyte to supplement active lithium of the electrolyte at the stage.
According to the invention, lithium supplementation in all lithium supplementation stages can be completed only by rotating the inner core, independent operation is not required for each lithium supplementation stage, and the problem of lithium precipitation caused by excessive lithium ion supplementation in each lithium supplementation stage is avoided.
Further, the first sub-inner core and the second sub-inner core are both cylinders; the outer peripheral surface of the first sub-inner core is in clearance fit with the inner wall of the shell; the outer peripheral surface of the second sub-inner core is tightly attached to the inner wall of the shell, n through grooves which extend along the axial direction of the second sub-inner core and are circumferentially distributed are formed in the second sub-inner core, and n mutually independent storage chambers are formed by matching the second sub-inner core with the inner wall of the shell.
Further, the housing includes a first hollow member and a second hollow member;
the first hollow member is a tubular structure with two open ends;
the second hollow component is a barrel structure with one end open;
the diameter of the second hollow member is smaller than that of the first hollow member, and the second hollow member is coaxially sleeved in the first hollow member.
Further, the inner wall of the first hollow member is provided with at least one annular groove along the circumferential direction thereof for fixing the sealing member.
Further, the first through hole is formed in the side wall of the second hollow member, and the second through hole is formed in the bottom of the second hollow member, so that the additive and the electrolyte can fully act.
In order to further improve the tightness between the outer shell and the inner core, the sealing member is a flood seal.
The invention also provides a repair bin, which is characterized in that: comprises a repairing bin shell and the repairing device for the high-capacity battery, wherein the repairing device is fixed in the repairing bin shell;
the top of the repair bin shell is provided with a third through hole, the high-capacity battery is fixed at the third through hole by using the repair device, the third through hole is sealed, and at least a second hollow member is positioned in the repair bin shell;
the side wall of the repair bin shell is provided with a first interface and a second interface, wherein a port of the first interface positioned in the repair bin shell is used for being communicated with the first through hole, and a port of the first interface positioned outside the repair bin shell is used for being connected with one end of an electrolyte sharing chamber in the high-capacity battery; the second interface is positioned at the port outside the repair bin shell and is used for being connected with the other end of the electrolyte sharing chamber in the high-capacity battery.
Further, in the repair device for a large-capacity battery, the top end of the case is welded to the peripheral area of the third through hole.
The invention also provides a high-capacity battery, which comprises a plurality of unit batteries connected in parallel and an electrolyte sharing chamber, wherein the electrolyte sharing chamber is used for completely penetrating electrolyte areas in the inner cavities of the plurality of unit batteries; the special feature is that: the system also comprises an external circulation system and the repair bin; the external circulation system comprises a first circulation pipeline, a second circulation pipeline, a third circulation pipeline and a circulation pump; the two ends of the first circulating pipeline are respectively connected with the first port of the repairing bin and one end of the electrolyte sharing chamber, the two ends of the second circulating pipeline are respectively connected with the second port of the repairing bin and the first port of the circulating pump, and the two ends of the third circulating pipeline are respectively connected with the second port of the circulating pump and the other end of the electrolyte sharing chamber.
According to the invention, the inner cavities of all the single batteries are communicated by utilizing the electrolyte sharing chamber, so that the electrolyte of all the single batteries is shared to ensure the consistency of all the single batteries, namely, the electrolyte chambers of all the single batteries are communicated, so that the electrolytes of all the single batteries are in the same system, the difference among the electrolytes of all the single batteries is reduced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent.
In different lithium supplementing stages, the lithium supplementing stage can be completed by only rotating the inner core in cooperation with an external circulating system, the operation is simple and convenient, and meanwhile, the uniformity of electrolyte in the electrolyte sharing chamber and the inner cavities of all the single batteries can be improved through repeated circulation of the electrolyte, so that the high-capacity battery has better charge and discharge circulating performance; in addition, during the circulation of the electrolyte, the heat of the large-capacity battery can be dissipated by the flow of the electrolyte, so that the large-capacity battery can be stabilized at a proper temperature.
The invention also provides another high-capacity battery, which is characterized in that: the device comprises an outer shell, a plurality of unit batteries which are arranged in the outer shell and connected in parallel, an external circulation system and the repairing bin;
the outer shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries;
the outer shell is provided with avoiding holes which can enable the polar terminals of all the single batteries to extend out; the polarity terminals of all the single batteries extend out of the avoidance holes, and the outer shell areas around the avoidance holes are fixedly sealed with the single battery shell;
the external circulation system comprises a first circulation pipeline, a second circulation pipeline, a third circulation pipeline and a circulation pump; the two ends of the first circulating pipeline are respectively connected with the first port of the repairing bin and one end of the electrolyte sharing chamber, the two ends of the second circulating pipeline are respectively connected with the second port of the repairing bin and the first port of the circulating pump, and the two ends of the third circulating pipeline are respectively connected with the second port of the circulating pump and the other end of the electrolyte sharing chamber.
Further, a temperature control device can be arranged in the repair bin.
According to the invention, a plurality of single batteries are arranged in one outer shell body with an electrolyte sharing cavity, and the electrolyte sharing cavity is communicated with the inner cavities of the single batteries in the outer shell body, so that the electrolyte sharing of the single batteries ensures the consistency of the single batteries, namely, the electrolyte cavities of the single batteries are communicated, the electrolytes of all the single batteries are in the same system, the difference among the electrolytes of the single batteries is reduced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the large-capacity battery is improved to a certain extent.
According to the invention, the electrolyte sharing chamber does not need to be spliced, the problem of coaxial splicing is not required to be considered in the arrangement direction of the single batteries, and the requirements on the processing precision and the assembly precision are low; meanwhile, a special tool is not needed, the assembly process is simpler, the processing difficulty and the processing cost of the high-capacity battery with the shared system are greatly reduced, and batch production can be realized.
In different lithium supplementing stages, the lithium supplementing stage can be completed by only rotating the inner core in cooperation with an external circulating system, the operation is simple and convenient, and meanwhile, the uniformity of electrolyte in the electrolyte sharing chamber and the inner cavities of all the single batteries can be improved through repeated circulation of the electrolyte, so that the high-capacity battery has better charge and discharge circulating performance; in addition, the temperature control device can be arranged on the repair bin, and in the circulation process of the electrolyte, the temperature control device is utilized to cool or heat the electrolyte in the repair bin, so that the high-capacity battery can be cooled or heated by means of the flow of the electrolyte, and the high-capacity battery can be stabilized at a proper temperature.
The beneficial effects of the invention are as follows:
according to the invention, the dosage of the additive in each storage cavity is adjusted according to the requirements of different lithium supplementing stages of the high-capacity battery, so that each storage cavity corresponds to one lithium supplementing stage; after the repairing device is fixed on the high-capacity battery, in the use process, at any lithium supplementing stage, the inner core is rotated, so that a target storage cavity corresponding to the lithium supplementing stage is communicated with the first through hole and the second through hole, electrolyte in the high-capacity battery is introduced into the first through hole to enter the storage cavity, flows out of the second through hole and enters the high-capacity battery again, and additives in the storage cavity can be quantitatively dissolved in the electrolyte to supplement active lithium of the electrolyte at the stage.
According to the embodiment, lithium supplementation in all lithium supplementation stages can be completed only by rotating the inner core, independent operation is not required for each lithium supplementation stage, and the problem of lithium precipitation caused by excessive lithium ion supplementation in each lithium supplementation stage is avoided.
Drawings
Fig. 1 is a schematic view of a structure of a large-capacity battery in the related art;
FIG. 2 is a schematic structural diagram of the repairing apparatus of example 1;
FIG. 3 is an exploded view of the prosthetic device of example 1;
FIG. 4 is a cross-sectional view of example 1 taken along the axial direction of the prosthetic device;
FIG. 5 is a cross-sectional view of example 1 taken along the radial direction of the prosthetic device;
FIG. 6 is a schematic structural view of the inner core of example 1;
fig. 7 is a schematic view of the structure of the housing in embodiment 1;
fig. 8 is a second schematic structural view of the housing in embodiment 1;
FIG. 9 is a schematic diagram of the repair bin structure of example 2;
FIG. 10 is a schematic view of the repair cartridge housing in example 2;
FIG. 11 is a cross-sectional view of the repair cartridge of example 2;
fig. 12 is a schematic diagram of the structure of a large-capacity battery according to embodiment 3;
fig. 13 is a schematic diagram of a large-capacity battery according to embodiment 3.
The reference numerals in the drawings are: 1. a housing; 11. a first hollow member; 111. an annular groove; 12. a second hollow member; 121. a first through hole; 122. a second through hole; 2. an inner core; 21. a first sub-core; 22. a second sub-core; 3. a sealing member; 4. a storage chamber; 5. repairing the bin; 50. repairing the bin shell; 51. a first interface; 52. a second interface; 53. a connecting pipe; 54. a third through hole; 6. a circulation system; 61. a first circulation line; 62. a second circulation line; 63. a third circulation line; 64. a circulation pump; 7. a single battery; 8. the electrolyte shares a chamber.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by "top, bottom" or the like in terms are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, third and the like" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 2 to 5, the present embodiment is a prosthetic device, which is mainly composed of an inner core 2, a sealing member 3, and an outer shell 1.
Wherein the core 2 is mainly composed of a two-part structure, and for convenience of description, the two-part structure of the core 2 is defined as a first sub-core 21 and a second sub-core 22, respectively; the first sub-inner core 21 and the second sub-inner core 22 are sleeved inside the shell 1, the first sub-inner core 21 is in clearance fit with the shell 1, and a plurality of mutually isolated storage chambers 4 are formed between the second sub-inner core 22 and the side wall of the shell 1; under the action of external force, the inner core 2 can rotate in the outer shell 1.
The sealing member 3 is located between the first sub-core 21 and the outer shell 1, sealing the gap therebetween.
The shell 1 is a barrel body with one open end, the bottom of the second inner sub-core 22 is tightly attached to the bottom of the shell 1, a first through hole 121 and a second through hole 122 which penetrate through the inner cavity of the shell 1 are formed in the position, corresponding to the second inner sub-core 22, of the shell 1, the first through hole 121 and the second through hole 122 are both used for being communicated with a high-capacity battery electrolyte sharing cavity, preferably, the first through hole 121 is used for being connected with one end of the high-capacity battery electrolyte sharing cavity 8, and the second through hole 122 is used for being connected with the other end of the high-capacity battery electrolyte sharing cavity 8.
Before the repairing device is fixed on the high-capacity battery, the content of the lithium supplement additive in each storage cavity 4 needs to be determined, so that the content of the lithium supplement additive in each storage cavity 4 is ensured to meet the dosage of the lithium supplement additive required by the corresponding lithium supplement stage.
After the repairing device is fixed on the high-capacity battery, in the use process, at any lithium supplementing stage, the inner core 2 is rotated, so that the target storage cavity 4 corresponding to the lithium supplementing stage is communicated with the first through hole 121 and the second through hole 122, electrolyte in the high-capacity battery is introduced into the first through hole 121 to enter the storage cavity 4, flows out of the second through hole 122 and enters the high-capacity battery again, and additives in the storage cavity 4 can be quantitatively dissolved in the electrolyte, so that the supplement of active lithium in the electrolyte at the stage is realized.
In this embodiment, only the inner core 2 is required to rotate to complete lithium supplementation in all lithium supplementation stages, no separate operation is required for each lithium supplementation stage, and the problem of lithium precipitation caused by excessive lithium ion supplementation in each lithium supplementation stage is avoided.
In addition, in other embodiments, other additives of different functions may be stored in each storage chamber 4 to meet the actual use needs. If the film forming additive can be stored, the film forming additive can be added into the cavity of the high-capacity battery in a set period, so that the problem that the resistance of the battery is increased due to the fact that the film forming additive is added excessively at one time is avoided.
In other embodiments, depending on the actual use requirements, it is also possible to store in the respective storage chamber 4 additives of different functions, such as conductive additives, flame retardant additives, overcharge protection additives, etc.
In other embodiments, according to actual use requirements, substances such as lithium salt that need to be replenished during the charge-discharge cycle of the lithium ion battery may also be stored in each storage chamber 4.
The structure of the inner core 2 in this embodiment is shown in fig. 6, in which the first sub-inner core 21 is a cylinder for clearance fit with the outer shell 1; the second inner sub-core 22 is a cross baffle fixed at the bottom of the cylinder and is used for being matched with the shell 1 to form 4 independent storage chambers 4; the second inner core 22 may be considered as a cylinder, the outer peripheral surface of the second inner core 22 is closely attached to the inner wall of the housing 1, and 4 through grooves extending along the axial direction and circumferentially arranged are formed in the second inner core 22 and are matched with the inner wall of the housing 1 to form 4 mutually independent storage chambers 4. In other embodiments, the number of storage chambers 4 may be varied by adjusting the number of baffles or channels. The number of storage chambers 4 is preferably the same as the number of lithium replenishment phases over the entire life cycle of the high-capacity battery. For example, for a certain large-capacity battery, which requires lithium replenishment about 6 times in the entire use period, the core 2 structure having 6 storage chambers 4 may be designed corresponding to the large-capacity battery.
In order to rotate the target storage chamber 4 corresponding to each lithium-compensating stage into place once, a marker may be provided on top of the first sub-core 21.
The structure of the housing 1 in the present embodiment is shown in fig. 7 and 8, and includes a first hollow member 11 and a second hollow member 12, wherein the first hollow member 11 is a tubular structure with both ends open; the second hollow member 12 is a barrel structure with an open end, the first through hole 121 is formed on the side wall of the second hollow member 12, and the second through hole 122 is formed at the bottom of the second hollow member 12, wherein the opening of the second through hole 122 is required to avoid the electrolyte additive passing through. The diameter of the second hollow member 12 is smaller than that of the first hollow member 11, the second hollow member 12 is coaxially sleeved in the first hollow member 11, and the open end of the second hollow member 12 is positioned in the first hollow member 11 and serves as an axial limiting surface of the first sub-inner core 21. The first hollow member and the second hollow member may be an integral piece or a separate piece, and in order to ensure the tightness of the housing, the two are preferably in an integral piece structure.
In other embodiments, the second through hole 122 may be formed on the side wall of the second hollow member 12, so long as the electrolyte entering the storage chamber 4 through the first through hole 121 can flow out of the second through hole 122. However, the effect of the electrolyte and the additive is poor with respect to the present invention.
In this embodiment, the sealing member 3 is a rotary sealing ring, and because part of the structure of the repairing device needs to be soaked in the electrolyte, the material of the rotary sealing ring should not react with the electrolyte, and in this embodiment, a sealing plug is preferred; the sealing ring is also called spring energy storage sealing ring, spring actuating sealing ring, tetrafluoro spring sealing ring, etc. and is a high-performance sealing ring formed by embedding stainless steel spring into a polytetrafluoroethylene sealing ring. Is not reacted with electrolyte and has very excellent long-acting sealing effect.
In this embodiment, at least one annular groove 111 is preferably formed in the inner wall of the first hollow member 11 along the circumferential direction thereof for fixing the sealing member 3; in the installation process, firstly, the plug seal is put into the annular groove 111 on the inner wall of the shell 1 in advance, and the plug seal and the inner wall of the shell 1 are fixed and sealed in a vulcanization or gluing mode; and then the inner core 2 is inserted into the shell 1, the first sub-inner core 21 of the inner core 2 is in contact with the plug seal and in interference fit with the plug seal, the bottom of the second sub-inner core 22 of the inner core 2 is tightly attached to the bottom of the second hollow member 12, and in order to ensure that the storage chambers 4 are mutually independent, the contact part of the second sub-inner core 22 and the second hollow member 12 should be kept sealed in the process of relative rotation. A flexible rubber barrel body (the part corresponding to the first through hole and the second through hole is provided with an opening) matched with the shape of the second hollow member 12 can be sleeved in the second hollow member 12, and the flexible rubber barrel body is tightly attached to the inner wall of the second hollow member 12, so that the second sub-inner core can rotate in the second hollow member, and the tightness between the second sub-inner core and the second hollow member can be ensured.
Example 2
This embodiment is a repair cartridge 5 having the repair device of embodiment 1, where the repair cartridge 5 can be understood as any chamber capable of storing electrolyte.
The structure of the repair cabin 5 of the present embodiment is shown in fig. 9 to 11, and includes a repair cabin housing 50, preferably a rectangular housing for structural matching with the unit cells 7; in other embodiments, a cylindrical or other shaped housing may be selected. A third through hole 54 is formed in the top of the repair bin housing 50 for mounting the repair device; the two side walls of the repairing bin shell 50 are provided with a first interface 51 and a second interface 52, wherein a port of the first interface 51 positioned in the repairing bin shell 50 is used for being communicated with a first through hole 121 of the repairing device shell 1, and a port of the first interface 51 positioned outside the repairing bin shell 50 is used for being connected with one end of an electrolyte sharing cavity 8 in the high-capacity battery; the second port 52 is located at the port outside the repair cabin housing 50 for connection with the other end of the electrolyte sharing chamber 8 in the high-capacity battery.
As can be seen in fig. 9 and 11, the prosthetic device is secured at the third port 54 within the prosthetic cartridge housing 50 and seals the third port 54;
the fixing can be realized by welding, screwing or gluing generally:
when the welding mode is adopted, after the repairing device is inserted into the third through hole 54, the end part of the first hollow member 11 can be connected with the peripheral area of the third through hole 54 by adopting a laser welding mode; in order to facilitate positioning, a positioning plate may be disposed outside the end of the first hollow member 11, a positioning slot adapted to the positioning plate is disposed in the repair bin housing 50 around the third through hole 54, and after the repair device is inserted into the third through hole 54, the positioning plate is fixed in the positioning slot, so that positioning of the repair device and the repair bin housing 50 can be achieved. Then, the end of the first hollow member 11 is connected to the peripheral region of the third through hole 54 by laser welding. The peripheral area of the third through hole 54 may be the wall of the third through hole 54, and may also be the repair bin housing 50 area around the third through hole 54.
When the screw connection mode is adopted, the repair bin shell 50 is required to have a thicker thickness, meanwhile, a thicker annular plate is required to be arranged at the end part of the first hollow member 11 of the repair device along the circumferential direction of the first hollow member, after the repair device is inserted into the third through hole 54, the annular plate is lapped on the repair bin shell 50 area around the third through hole 54, the annular plate is connected with the repair bin shell 50 by adopting a screw, and in order to ensure the tightness of the position, a sealing ring can be additionally arranged at the connecting position.
When the gluing mode is adopted, an annular plate is arranged at the end part of the first hollow member 11 of the repairing device along the circumferential direction, after the repairing device is inserted into the third through hole 54, the annular plate is lapped on the repairing bin shell 50 area around the third through hole 54, and sealing glue is injected between the annular plate and the repairing bin shell 50 to realize sealing connection of the annular plate and the repairing bin shell 50.
Compared with the screw connection and gluing modes, the welding sealing reliability is better, and the corresponding structure is simpler, so the welding mode is selected to fix the repairing device on the repairing bin shell 50 in the embodiment.
In other embodiments, the outer wall of the first hollow member 11 may be welded to the peripheral area of the third through hole 54, so as to fix the repairing device to the repairing cartridge housing 50, and ensure that the second hollow member 12 is located inside the repairing cartridge housing 50.
In order to facilitate fixing the repairing device and connecting the internal pipelines, the repairing bin housing 50 of the embodiment can adopt a split structure, and is composed of a bucket body with an open top and a cover plate for sealing the open end. The third through hole 54 is formed in the cover plate, and when specifically assembled: fixing the repairing device on the cover plate, connecting the connecting pipe 53 at the first through hole 121, placing the cover plate at the open end of the barrel body, connecting the connecting pipe 53 with the first interface 51, and finally welding the cover plate at the open end of the barrel body in a welding mode.
Before the repair bin 5 in the embodiment is connected with the high-capacity battery, electrolyte can be injected into the repair bin first, and the inner core is rotated so that the storage chamber 4 corresponding to the first lithium supplementing stage is immersed in the electrolyte; the electrolyte inside the high-capacity battery sequentially passes through the first interface, the connecting pipe and the first through hole to enter the storage cavity 4, flows out of the second through hole 122 and is uniformly mixed with the electrolyte in the repairing bin, enters the high-capacity battery again through the second interface, and the additive in the storage cavity 4 can be quantitatively dissolved in the electrolyte to realize the supplement of the electrolyte active lithium at the stage, and meanwhile, the electrolyte in the electrolyte bin enters the inner cavities of all the single batteries and can also play the role of liquid exchange.
Example 3
The present embodiment is a large-capacity battery having a repair cabin 5 in embodiment 2, and as shown in fig. 12 and 13, the large-capacity battery of the present embodiment includes 9 parallel unit batteries 7, an electrolyte sharing chamber 8 located at the bottom of each unit battery 7, the repair cabin 5 in embodiment 2, and an external circulation system 6; in other embodiments, the number of the single batteries 7 can be adjusted according to actual requirements.
The external circulation system 6 includes a first circulation line 61, a second circulation line 62, a third circulation line 63, and a circulation pump 64; wherein, two ends of the first circulation pipeline 61 are respectively connected with the first interface 51 of the repairing bin 5 and one end of the electrolyte sharing chamber 8, two ends of the second circulation pipeline 62 are respectively connected with the second interface 52 of the repairing bin 5 and the first port of the circulation pump 64, and two ends of the third circulation pipeline 63 are respectively connected with the second port of the circulation pump 64 and the other end of the electrolyte sharing chamber 8.
The above-mentioned connection portions are all required to ensure good sealing properties.
In any lithium supplementing stage, after the corresponding storage chamber 4 is rotated in place, the circulation pump 64 is started, electrolyte in the inner cavity of each single battery 7 is pumped into the storage chamber 4 through the electrolyte sharing chamber 8, after being treated by the additive, the electrolyte flows into the liquid storage tank through the second through hole 122, flows into the inner cavity of each single battery 7 through the second circulation pipeline 62, the circulation pump 64 and the third circulation pipeline 63, one circulation is completed, and the circulation can be executed for a plurality of times, so that lithium supplementing and liquid changing in the stage are completed.
In addition, the temperature control device can be arranged on the repair bin, and in the circulation process of the electrolyte, the temperature of the electrolyte in the repair bin is reduced or increased by the temperature control device, so that the high-capacity battery can be reduced or increased by the flow of the electrolyte, and the high-capacity battery can be stabilized at a proper temperature. The temperature control device can be TEC or liquid cooling plate.
Example 4
Unlike example 3, this example employs a large-capacity battery of the following structure:
the high-capacity battery comprises an outer shell, m parallel single batteries arranged in the outer shell, m is more than 1, a repair bin in the embodiment 2 and an external circulation system; each single cell cavity comprises an electrolyte zone and a gas zone.
For convenience of description, the outer case length direction is defined as an x direction, the outer case width direction is defined as a y direction, and the outer case height direction is defined as a z direction.
The outer shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries;
the top plate of the outer shell can be provided with a gas chamber which covers the top gas port of each single battery in the large-capacity battery. Here, the gas port includes the following two meanings:
1) The gas port is a through hole which is directly arranged on the upper cover plate of the single battery and penetrates through the inner cavity of the single battery;
at the moment, the inner cavity of the gas cavity is communicated with the gas areas of the inner cavities of all the single batteries through the gas port, the gas cavity is used as a gas sharing cavity of all the single batteries, the gas areas of all the single batteries can be communicated based on the gas cavity, so that the gas balance is achieved, the gas sharing of all the single batteries ensures the consistency of all the single batteries, and the cycle life of the large-capacity battery is prolonged to a certain extent; when any single battery is out of control, the flue gas in the inner cavity of the single battery enters the gas chamber and is discharged through the gas chamber, so that the safety of the high-capacity battery is improved.
2) The gas port is an explosion venting port or an explosion prevention port arranged on the upper cover plate of the single battery, and an explosion venting membrane is arranged at the explosion venting port or the explosion prevention port;
at the moment, the gas chamber is used as an explosion venting channel, and when the explosion venting membrane at the gas port of any single battery is broken by the inner cavity smoke, the smoke in the inner cavity of the single battery is discharged through the gas chamber, so that the safety of the high-capacity battery is improved.
In order to improve the heat dissipation performance of the high-capacity battery, an avoidance hole which can enable the polar terminal of each single battery to extend out is formed in the top plate of the outer shell; and each single battery polar terminal extends out of the avoidance hole, and the top plate area of the outer shell surrounding the avoidance hole is fixedly sealed with the single battery shell.
It should be noted that, the single battery polar terminal described herein may be a single battery polar post, if the single battery polar post is not capable of smoothly extending out of the avoiding hole as the polar terminal, a polar post adaptor may be further connected to the single battery polar post, and the single battery polar post and the polar post adaptor are combined together to form a whole structure as the single battery polar terminal.
After the polar terminal of the single battery extends out of the avoiding hole, a heat exchange tube can be fixed on the polar terminal, and when the temperature of the high-capacity battery is higher than a set threshold value, a heat transfer medium with lower temperature is introduced into the heat exchange tube to cool the high-capacity battery; when the temperature of the high-capacity battery is lower than a set threshold value, heating the high-capacity battery by introducing a heat transfer medium with higher temperature into the heat exchange tube; by controlling the temperature of the heat transfer medium, it is ensured that the high-capacity battery always operates at a normal operating temperature.
In addition, similar to embodiment 3, a temperature control device may be further disposed on the repair bin, and in the circulation process of the electrolyte, the electrolyte in the repair bin is cooled or warmed by the temperature control device, so that the high-capacity battery can be cooled or warmed by the flow of the electrolyte, and the high-capacity battery can be stabilized at a proper temperature.
The temperature control device can be TEC or liquid cooling plate.
The structure of the external circulation system is the same as in embodiment 3, wherein two ends of the first circulation pipeline are respectively connected with the first port of the repairing bin and one end of the electrolyte sharing chamber, two ends of the second circulation pipeline are respectively connected with the second port of the repairing bin and the first port of the circulation pump, and two ends of the third circulation pipeline are respectively connected with the second port of the circulation pump and the other end of the electrolyte sharing chamber.
Claims (9)
1. The large-capacity battery comprises a plurality of unit batteries (7) which are connected in parallel and an electrolyte sharing chamber (8), wherein the electrolyte sharing chamber (8) is communicated with electrolyte areas in inner cavities of the unit batteries (7); the method is characterized in that: the repairing device comprises an inner core (2), a sealing component (3) and a shell (1) which are coaxially sleeved in sequence from inside to outside;
the inner core (2) comprises a first sub-inner core (21) and a second sub-inner core (22), the first sub-inner core (21) is in clearance fit with the side wall of the shell (1), and n mutually independent storage chambers (4) are formed between the second sub-inner core (22) and the side wall of the shell (1); wherein n is an integer greater than 1;
the sealing member (3) is positioned between the first sub-inner core (21) and the outer shell (1) and is used for sealing a gap between the first sub-inner core and the outer shell;
the shell (1) is a barrel body with one open end, the bottom of the second sub-inner core (22) is tightly attached to the bottom of the shell (1), and a first through hole (121) and a second through hole (122) are formed in the part, corresponding to the second sub-inner core (22), of the shell (1); wherein the first through hole (121) and the second through hole (122) are both used for communicating with the high-capacity battery electrolyte sharing chamber (8);
under the action of external force, the inner core (2) can rotate in the outer shell (1), so that the first through hole (121) and the second through hole (122) are communicated with different storage chambers (4); the first sub-inner core (21) and the second sub-inner core (22) are both cylinders; the peripheral surface of the first sub-inner core (21) is in clearance fit with the inner wall of the shell (1);
the outer peripheral surface of the second sub-inner core (22) is tightly attached to the inner wall of the shell (1), n through grooves which extend along the axial direction of the second sub-inner core (22) and are circumferentially distributed are formed in the second sub-inner core (22), and the second sub-inner core is matched with the inner wall of the shell (1) to form n mutually independent storage chambers (4); the housing (1) comprises a first hollow member (11) and a second hollow member (12);
the first hollow member (11) is a tubular structure with two open ends;
the second hollow component (12) is a barrel structure with one end open;
the diameter of the second hollow member (12) is smaller than that of the first hollow member (11), and the second hollow member (12) is coaxially sleeved in the first hollow member (11).
2. The repair device for a large-capacity battery according to claim 1, wherein: the inner wall of the first hollow member (11) is provided with at least one annular groove (111) along the circumferential direction thereof for fixing the sealing member (3).
3. The repair device for a large-capacity battery according to claim 2, wherein: the first through hole (121) is formed in the side wall of the second hollow member (12), and the second through hole (122) is formed in the bottom of the second hollow member (12).
4. The repair device for a large-capacity battery according to claim 1, wherein: the sealing member (3) is a flood seal.
5. A repair bin, characterized by: comprising a repair bin housing (50), the repair device for a high-capacity battery according to any one of claims 1 to 4 fixed in the repair bin housing (50);
a third through hole (54) is formed in the top of the repair bin shell (50), the high-capacity battery is fixed at the third through hole (54) through a repair device, the third through hole (54) is sealed, and at least the second hollow member (12) is positioned in the repair bin shell (50);
a first interface (51) and a second interface (52) are arranged on the side wall of the repair bin shell (50), wherein a port of the first interface (51) positioned in the repair bin shell (50) is used for being communicated with the first through hole (121), and a port of the first interface (51) positioned outside the repair bin shell (50) is used for being connected with one end of an electrolyte sharing chamber (8) in the high-capacity battery; the second interface (52) is positioned at the port outside the repair bin shell (50) and is used for being connected with the other end of the electrolyte sharing chamber (8) in the high-capacity battery.
6. The repair bin of claim 5, wherein: in the repair device for a large-capacity battery, the top end of the housing (1) is welded to the peripheral area of the third through hole (54).
7. The high-capacity battery comprises a plurality of unit batteries (7) which are connected in parallel and an electrolyte sharing chamber (8), wherein the electrolyte sharing chamber (8) is communicated with electrolyte areas in inner cavities of the plurality of unit batteries (7); the method is characterized in that: also comprises an external circulation system (6) and a repair cabin (5) according to claim 5 or 6; the external circulation system (6) comprises a first circulation pipeline (61), a second circulation pipeline (62), a third circulation pipeline (63) and a circulation pump (64); the two ends of the first circulating pipeline (61) are respectively connected with the first interface (51) of the repairing bin (5) and one end of the electrolyte sharing chamber (8), the two ends of the second circulating pipeline are respectively connected with the second interface (52) of the repairing bin (5) and the first port of the circulating pump (64), and the two ends of the third circulating pipeline (63) are respectively connected with the second port of the circulating pump (64) and the other end of the electrolyte sharing chamber (8).
8. A high capacity battery characterized by: comprises an outer shell, a plurality of unit cells (7) which are arranged in the outer shell and connected in parallel, an external circulation system (6) and a repairing bin (5) as claimed in claim 5 or 6;
the outer shell is provided with an electrolyte sharing chamber (8); the electrolyte sharing chamber (8) is communicated with electrolyte areas in the inner cavities of the single batteries (7);
the outer shell is provided with avoiding holes which can enable the polar terminals of the single batteries (7) to extend out; the polarity terminals of the single batteries (7) extend out of the avoidance holes, and the outer shell areas around the avoidance holes are fixedly sealed with the single battery (7) shell;
the external circulation system (6) comprises a first circulation pipeline (61), a second circulation pipeline (62), a third circulation pipeline (63) and a circulation pump (64); the two ends of the first circulating pipeline (61) are respectively connected with the first interface (51) of the repairing bin (5) and one end of the electrolyte sharing chamber (8), the two ends of the second circulating pipeline are respectively connected with the second interface (52) of the repairing bin (5) and the first port of the circulating pump (64), and the two ends of the third circulating pipeline (63) are respectively connected with the second port of the circulating pump (64) and the other end of the electrolyte sharing chamber (8).
9. The large-capacity battery according to claim 7 or 8, characterized in that: the repair bin (5) is provided with a temperature control device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311703621.1A CN117393966B (en) | 2023-12-13 | 2023-12-13 | Repair device for large-capacity battery, repair bin and large-capacity battery |
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| CN202311703621.1A CN117393966B (en) | 2023-12-13 | 2023-12-13 | Repair device for large-capacity battery, repair bin and large-capacity battery |
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