CN117594950A - Cylindrical battery monomer with exhaust holes - Google Patents
Cylindrical battery monomer with exhaust holes Download PDFInfo
- Publication number
- CN117594950A CN117594950A CN202410024147.8A CN202410024147A CN117594950A CN 117594950 A CN117594950 A CN 117594950A CN 202410024147 A CN202410024147 A CN 202410024147A CN 117594950 A CN117594950 A CN 117594950A
- Authority
- CN
- China
- Prior art keywords
- battery
- protective sleeve
- film
- exhaust hole
- unidirectional
- 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.)
- Pending
Links
- 239000000178 monomer Substances 0.000 title abstract description 3
- 239000012528 membrane Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000009423 ventilation Methods 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims description 36
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 abstract description 33
- 230000015572 biosynthetic process Effects 0.000 abstract description 31
- 238000000034 method Methods 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000740 bleeding effect Effects 0.000 description 3
- 238000007600 charging Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000010277 constant-current charging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/392—Arrangements for facilitating escape of gases with means for neutralising or absorbing electrolyte; with means for preventing leakage of electrolyte through vent holes
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/394—Gas-pervious parts or elements
-
- 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
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention discloses a cylindrical battery monomer with an exhaust hole, which comprises a shell and an air ventilation mechanism; the shell is internally provided with a containing cavity for containing the winding core, the shell is provided with an anode cover plate, and the anode cover plate is provided with a liquid injection hole and an exhaust hole which are communicated with the containing cavity; the ventilation mechanism comprises a waterproof ventilation membrane and a unidirectional membrane. The beneficial effects of the invention are as follows: the exhaust hole is additionally arranged beside the liquid injection hole, the waterproof breathable film and the unidirectional film are arranged in the exhaust hole, and in the negative pressure formation, the waterproof breathable film only allows gas generated in the battery formation process to be discharged and blocks the circulation of electrolyte, and the unidirectional film only allows gas to be discharged and does not allow gas to enter the battery, so that the gas generated in the battery formation process is discharged, and meanwhile, the suction of the electrolyte in the battery is avoided, the liquid retention amount of the battery in the formation process is maintained, the unnecessary loss of the electrolyte is reduced, the production and manufacturing costs are reduced, and the excellent electrical performance of the battery is ensured.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a cylindrical battery cell with an exhaust hole.
Background
Negative pressure formation is a common formation method in which the air pressure inside the battery is regulated by a pressure control system. In the prior art, a specific device is generally used for carrying out negative pressure formation operation of a battery, and a negative pressure vacuum system is used for extracting gas generated in the formation process from a battery liquid injection port, so that the purpose of timely discharging the gas generated in the formation process and ensuring good contact of an internal interface of the battery is achieved.
The negative pressure formation mode has the defects that: under the condition that the liquid injection hole and the negative pressure formation suction nozzle part of the battery are not protected by any device, electrolyte in the battery is easily sucked out during the negative pressure formation. On one hand, the loss of electrolyte in the battery is caused, so that the electrolyte is insufficient, the compactness of the SEI of the battery core is influenced, and the electrochemical performance of the battery core is seriously influenced; on the other hand, because the battery is generally produced in a low dew point environment, the electrolyte is easy to crystallize, and the blockage of an air exhaust pipeline is easy to cause, so that the cleaning difficulty is increased.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a cylindrical battery cell with a vent hole to solve the technical problems that the electrolyte inside the battery is easily sucked out during the negative pressure formation of the conventional battery, resulting in the loss of the electrolyte inside the battery and the blockage of the air exhaust pipeline.
In order to achieve the above object, the present invention provides a cylindrical battery cell with an exhaust hole, comprising a housing and an air permeable mechanism;
the shell is internally provided with a containing cavity for containing the winding core, the shell is provided with an anode cover plate, and the anode cover plate is provided with a liquid injection hole and an exhaust hole which are communicated with the containing cavity;
the ventilation mechanism comprises a waterproof ventilation membrane and a unidirectional membrane, wherein the waterproof ventilation membrane and the unidirectional membrane are both fixed in the exhaust hole, and the unidirectional membrane only allows gas to be discharged out of the exhaust hole and does not allow fluid to enter the exhaust hole.
In some embodiments, the vent holes are the same shape as the fill holes and are all circular.
In some embodiments, the waterproof and breathable film comprises a breathable film body and a first protective sleeve, wherein the breathable film body is in a circular truncated cone shape and is provided with a first bottom film and a first side film, the first protective sleeve is fixedly sleeved on the first side film of the breathable film body, and the first protective sleeve is in a circular truncated cone shape and is inserted into the inner wall of the exhaust hole.
In some embodiments, the first protective sleeve is welded to the positive cover plate.
In some embodiments, the first protective jacket is a first stainless steel protective jacket.
In some embodiments, the unidirectional film includes a unidirectional film body and a second protective sleeve, the unidirectional film body is in a shape of a truncated cone and has a second bottom film and a second side film, the second protective sleeve is fixedly sleeved on the second side film, and the second protective sleeve is in a shape of a truncated cone and is inserted in the first protective sleeve.
In some embodiments, the first protective sheath is welded to the second protective sheath.
In some embodiments, the second protective sheath is a second stainless steel protective sheath.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that: and an exhaust hole is newly formed beside the liquid injection hole, a water-proof breathable film and a unidirectional film are arranged in the exhaust hole, and the water-proof breathable film only allows gas generated in the battery formation process to be discharged and blocks the circulation of electrolyte when the negative pressure is formed, and the unidirectional film only allows gas to be discharged and does not allow gas to enter the battery. The advantages of this design are: on one hand, the gas generated in the battery formation process can be discharged, the suction of electrolyte in the battery is completely avoided, the liquid retention amount of the battery in the formation process is maintained, the unnecessary loss of the electrolyte is reduced, the production and manufacturing cost is reduced, and meanwhile, the battery is ensured to have excellent electrical performance; on the other hand avoids electrolyte crystallization from the source to block up the pipeline of bleeding, reduces the washing burden, has also avoided electrolyte corrosion pipe simultaneously, has improved the life of equipment, and in addition, the outside air gets into in the battery after the unilateral membrane can also reduce the extraction air cock, can improve the stability of battery quality.
Drawings
Fig. 1 is a schematic structural view of an embodiment of a cylindrical battery cell with vent holes according to the present invention;
FIG. 2 is a schematic view of the vent and ventilation mechanism of FIG. 1;
FIG. 3 is an enlarged view of a portion of area A of FIG. 2;
FIG. 4 is a top view of FIG. 1;
in the figure: 1-shell, 11-holding cavity, 12-liquid injection hole, 13-exhaust hole, 14-positive electrode cover plate, 2-ventilation mechanism, 21-water-proof ventilation film, 211-ventilation film main body, 2112-first side film, 212-first protective sleeve, 22-one-way film, 221-one-way film main body, 2212-second side film and 222-second protective sleeve.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
Referring to fig. 1-4, the present invention provides a cylindrical battery cell with an exhaust hole, comprising a housing 1 and a ventilation mechanism 2;
the shell 1 is internally provided with a containing cavity 11 for containing the winding core, the shell 1 is provided with a positive cover plate 14, and the positive cover plate 14 is provided with a liquid injection hole 12 and an exhaust hole 13 which are communicated with the containing cavity 11;
the ventilation mechanism 2 comprises a water-proof ventilation film 21 and a unidirectional film 22, wherein the water-proof ventilation film 21 and the unidirectional film 22 are both fixed in the exhaust hole 13, and the unidirectional film 22 only allows the gas to be discharged out of the exhaust hole 13 and does not allow the fluid to enter the exhaust hole 13.
When the electrolyte is injected, the electrolyte is injected into the accommodating cavity 11 from the electrolyte injection hole 12, after the electrolyte injection is finished, the electrolyte injection hole 12 is welded and sealed by a sealing nail, then negative pressure formation is carried out, and when the negative pressure formation is carried out, the air suction nozzle is inserted into the air exhaust hole 13, and the air in the shell 1 is sucked away to keep the electrolyte in the accommodating cavity.
In the invention, an exhaust hole 13 is additionally arranged beside a liquid injection hole 12, a water-proof air-permeable membrane 21 and a one-way membrane 22 are arranged in the exhaust hole 13, and during negative pressure formation, the water-proof air-permeable membrane 21 only allows gas generated in the battery formation process to be discharged and prevents the circulation of electrolyte, and the one-way membrane 22 only allows gas to be discharged and does not allow gas to enter the battery. The advantages of this design are: on one hand, the gas generated in the battery formation process can be discharged, the suction of electrolyte in the battery is completely avoided, the liquid retention amount of the battery in the formation process is maintained, the unnecessary loss of the electrolyte is reduced, the production and manufacturing cost is reduced, and meanwhile, the battery is ensured to have excellent electrical performance; on the other hand avoids electrolyte crystallization from the source to block up the pipeline of bleeding, reduces the washing burden, has also avoided electrolyte corrosion pipe simultaneously, has improved the life of equipment, and in addition, one-way membrane 22 can also reduce and take out in the air cock outside air gets into the battery, can improve the stability of battery quality.
The negative pressure formation adopts a mode of circularly alternating high and low vacuum degrees (other alternating modes can also be adopted), wherein the low vacuum refers to the pressure of-20 Kpa to-70 Kpa, and the high vacuum refers to the pressure value with the absolute value of the pressure being larger than 70 Kpa. In the first step, the battery is charged with constant current by using smaller current, the charging capacity reaches 1% -30% of the nominal capacity of the battery, and the process uses smaller pressure for pumping air so as not to influence the compactness and uniformity of SEI film formation and also discharge the produced gas; in the second step, when the vacuum is high, constant current charging is carried out on the battery with a slightly large current, the accumulated charging capacity reaches 30% -60% of the nominal capacity of the battery, a more stable SEI film is formed in the process, and the gas production rate is increased; and thirdly, in the low vacuum state, constant current charging is carried out on the battery with the current larger than the given current in the second step, the accumulated charging capacity reaches 60% -90% of the nominal capacity of the battery, the SEI film continues to stably grow in the process, and the vacuum degree is reduced so as to enable the gas in the battery to be discharged more completely.
In a preferred embodiment, the shape of the vent hole is the same as the shape of the liquid injection hole, and the vent holes are all round.
In order to specifically implement the installation of the waterproof and breathable film 21, referring to fig. 2 and 3, in a preferred embodiment, the waterproof and breathable film 21 includes a breathable film main body 211 and a first protection sleeve 212, the breathable film main body 211 is in a circular truncated cone shape and has a first bottom film and a first side film 2112, the first protection sleeve 212 is fixedly sleeved on the first side film 2112 of the breathable film main body 211, and the first protection sleeve 212 is in a circular truncated cone shape and is inserted into the inner wall of the exhaust hole 13. It should be appreciated that the height of the vented membrane main body 211 should not affect core in-shell.
In order to specifically connect the first protection sleeve 212 to the inner wall of the exhaust hole 13, referring to fig. 2 and 3, in a preferred embodiment, the first protection sleeve 212 is welded to the positive cover plate 14.
In order to specifically fix the first protection sleeve 212 to the inner wall of the exhaust hole 13, referring to fig. 2 and 3, in a preferred embodiment, the first protection sleeve 212 is a first stainless steel protection sleeve, so that the strength of the first protection sleeve 212 can be provided.
In order to specifically implement the installation of the unidirectional film 22, referring to fig. 2 and 3, in a preferred embodiment, the unidirectional film 22 includes a unidirectional film body 221 and a second protection sleeve 222, the unidirectional film body 221 is in a circular truncated cone shape and has a second bottom film and a second side film 2212, the second protection sleeve 222 is fixedly sleeved on the second side film 2212, and the second protection sleeve 222 is in a circular truncated cone shape and is inserted into the first protection sleeve 212. It should be appreciated that the height of the unidirectional film body 221 should not affect the core-in-shell.
To secure the second protective sheath 222, referring to fig. 2 and 3, in a preferred embodiment, the first protective sheath 212 is welded to the second protective sheath 222.
In order to increase the strength of the second protective sheath 222, referring to fig. 2 and 3, in a preferred embodiment, the second protective sheath 222 is a second stainless steel protective sheath.
For a better understanding of the present invention, the following description will be given with reference to fig. 1 to 4 for a detailed description of the operation of the cylindrical battery cell with the vent hole according to the present invention: when the electrolyte is injected, the electrolyte is injected into the accommodating cavity 11 from the liquid injection hole 12, after the injection is finished, the liquid injection hole 12 is welded and sealed by using a sealing nail, then negative pressure formation is carried out, during the negative pressure formation, the air suction nozzle is inserted into the air exhaust hole 13 and is matched with the inner ring of the baffle ring 3, and the air in the shell 1 is pumped away by negative pressure formation equipment, so that the electrolyte is reserved in the accommodating cavity.
In the invention, an exhaust hole 13 is additionally arranged beside a liquid injection hole 12, a water-proof air-permeable membrane 21 and a one-way membrane 22 are arranged in the exhaust hole 13, and during negative pressure formation, the water-proof air-permeable membrane 21 only allows gas generated in the battery formation process to be discharged and prevents the circulation of electrolyte, and the one-way membrane 22 only allows gas to be discharged and does not allow gas to enter the battery. The advantages of this design are: on one hand, the gas generated in the battery formation process can be discharged, the suction of electrolyte in the battery is completely avoided, the liquid retention amount of the battery in the formation process is maintained, the unnecessary loss of the electrolyte is reduced, the production and manufacturing cost is reduced, and meanwhile, the battery is ensured to have excellent electrical performance; on the other hand avoids electrolyte crystallization from the source to block up the pipeline of bleeding, reduces the washing burden, has also avoided electrolyte corrosion pipe simultaneously, has improved the life of equipment, and in addition, one-way membrane 22 can also reduce and take out in the air cock outside air gets into the battery, can improve the stability of battery quality.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
The terms "horizontal," "vertical," "overhang," and the like do not denote that the component is required to be absolutely horizontal, vertical, or overhang, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (8)
1. A cylindrical battery cell with exhaust holes is characterized by comprising a shell and an air ventilation mechanism;
the shell is internally provided with a containing cavity for containing the winding core, the shell is provided with an anode cover plate, and the anode cover plate is provided with a liquid injection hole and an exhaust hole which are communicated with the containing cavity;
the ventilation mechanism comprises a waterproof ventilation membrane and a unidirectional membrane, wherein the waterproof ventilation membrane and the unidirectional membrane are both fixed in the exhaust hole, and the unidirectional membrane only allows gas to be discharged out of the exhaust hole and does not allow fluid to enter the exhaust hole.
2. The cylindrical battery cell with the vent hole according to claim 1, wherein the vent hole has the same shape as the liquid injection hole and is circular.
3. The cylindrical battery cell with the vent hole according to claim 1, wherein the waterproof and breathable film comprises a breathable film body and a first protective sleeve, the breathable film body is in a circular truncated cone shape and is provided with a first bottom film and a first side film, the first protective sleeve is fixedly sleeved on the first side film of the breathable film body, and the first protective sleeve is in a circular truncated cone shape and is inserted into the inner wall of the vent hole.
4. The cylindrical battery cell with vent of claim 3, wherein the first protective sleeve is welded to the positive cap plate.
5. The cylindrical battery cell with vent of claim 4, wherein the first protective sleeve is a first stainless steel protective sleeve.
6. The cylindrical battery cell with the exhaust hole according to claim 4, wherein the unidirectional film comprises a unidirectional film body and a second protective sleeve, the unidirectional film body is in a circular truncated cone shape and is provided with a second bottom film and a second side film, the second protective sleeve is fixedly sleeved on the second side film, and the second protective sleeve is in a circular truncated cone shape and is inserted into the first protective sleeve.
7. The cylindrical battery cell with vent of claim 6, wherein the first protective sleeve is welded to the second protective sleeve.
8. The cylindrical battery cell with vent of claim 7, wherein the second protective sleeve is a second stainless steel protective sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410024147.8A CN117594950A (en) | 2024-01-05 | 2024-01-05 | Cylindrical battery monomer with exhaust holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410024147.8A CN117594950A (en) | 2024-01-05 | 2024-01-05 | Cylindrical battery monomer with exhaust holes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117594950A true CN117594950A (en) | 2024-02-23 |
Family
ID=89910186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410024147.8A Pending CN117594950A (en) | 2024-01-05 | 2024-01-05 | Cylindrical battery monomer with exhaust holes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117594950A (en) |
-
2024
- 2024-01-05 CN CN202410024147.8A patent/CN117594950A/en active Pending
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