CN116053710A - Current collecting assembly, battery monomer and battery pack - Google Patents
Current collecting assembly, battery monomer and battery pack Download PDFInfo
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- CN116053710A CN116053710A CN202310075341.4A CN202310075341A CN116053710A CN 116053710 A CN116053710 A CN 116053710A CN 202310075341 A CN202310075341 A CN 202310075341A CN 116053710 A CN116053710 A CN 116053710A
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- positioning
- current collecting
- injection hole
- body portion
- battery cell
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- 239000000178 monomer Substances 0.000 title abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 59
- 239000007924 injection Substances 0.000 claims abstract description 59
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 230000002093 peripheral effect Effects 0.000 claims abstract description 26
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000004308 accommodation Effects 0.000 claims description 2
- 238000004378 air conditioning Methods 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008595 infiltration Effects 0.000 abstract description 7
- 238000001764 infiltration Methods 0.000 abstract description 7
- 230000000740 bleeding effect Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 19
- 238000005086 pumping Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 238000000605 extraction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- 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
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted 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
- H01M50/60—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
- H01M50/618—Pressure control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/673—Containers for storing liquids; Delivery conduits therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides a current collecting assembly, a battery cell and a battery pack. The current collecting assembly includes: the connecting piece is provided with a first surface, a second surface and a peripheral side surface, the second surface is opposite to the first surface, the peripheral side surface is bent and connected between the first surface and the second surface, the connecting piece is also provided with a first liquid injection hole penetrating through the first surface and the second surface, and a first channel for communicating the first liquid injection hole with at least one opening formed on the peripheral side surface; the current collector is arranged adjacent to the second surface and connected to the connecting piece, and is provided with a second liquid injection hole which is communicated with the first liquid injection hole. The utility model provides a collector module, battery monomer and battery package can effectively shorten the inside route of bleeding of battery monomer to improve the free notes liquid efficiency of battery and the infiltration efficiency of electrolyte, and then improve the free production efficiency of battery.
Description
Technical Field
The application relates to the field of batteries, in particular to a current collecting assembly, a battery cell and a battery pack.
Background
In the production process of the secondary battery, electrolyte is required to be injected into the battery monomer, and the existing battery monomer adopts a positive and negative pressure circulation mode for injecting the electrolyte. When the battery cell is in a negative pressure state, the internal air pressure of the battery cell is smaller than the air pressure of the space where the electrolyte is located, a pressure difference is formed between the internal of the battery cell and the space where the electrolyte is located, and the internal of the battery cell is injected by the aid of the pressure electrolyte. In order to enable the battery monomer to be in a negative pressure state, air needs to be pumped out of the battery monomer, and the existing battery monomer internally comprises a current collecting component and an electrode component, so that the air pumping path in the battery monomer is tortuous and complicated, the air pumping efficiency is low, and the liquid injection efficiency of electrolyte and the production efficiency of the battery monomer are further affected.
Disclosure of Invention
To above-mentioned problem, this application embodiment provides a collector assembly, battery monomer and battery package, and it can effectively shorten the inside air extraction route of battery monomer to improve the free notes liquid efficiency of battery and the infiltration efficiency of electrolyte, and then improve the free production efficiency of battery.
Embodiments of the first aspect of the present application provide a current collecting assembly comprising:
the connecting piece is provided with a first surface, a second surface and a peripheral side surface, wherein the second surface is opposite to the first surface, the peripheral side surface is bent and connected between the first surface and the second surface, the connecting piece is also provided with a first liquid injection hole penetrating through the first surface and the second surface, and a first channel for communicating the first liquid injection hole with at least one opening formed on the peripheral side surface; a kind of electronic device with high-pressure air-conditioning system
The current collector is arranged adjacent to the second surface and connected with the connecting piece, and is provided with a second liquid injection hole which is communicated with the first liquid injection hole.
When the current collecting component is applied to the battery monomer, on the one hand, the current collecting component is provided with a first liquid injection hole, so that the liquid injection position of the battery monomer is integrated on the current collecting component, the overall structure of the battery monomer is more compact, and electrolyte is more conveniently injected into the battery monomer. On the other hand, the pumping efficiency is low due to the long pumping path of the air between the end cap and the current collector. Through setting up first passageway, first passageway with first notes liquid hole intercommunication, be located the end cover with air between the collector can be directly through first passageway, take out to the battery monomer is outside, effectively shortens the route of bleeding, improves the efficiency of bleeding, thereby improves the free production efficiency of battery.
Further, the first channel is a recess formed on the second surface facing to the second surface.
In the embodiment of the application, the first channel is arranged on the second surface, so that the processing of the first channel is facilitated, and the processing efficiency of the current collecting assembly is improved.
Further, the first passage penetrates through the peripheral side surface and communicates the first liquid injection hole with two openings formed in the peripheral side surface.
In the embodiment of the application, the first channel penetrates through the peripheral side surface and is communicated with the two openings formed in the peripheral side surface, so that air between the end cover and the current collector enters the first liquid injection hole through the two openings at the same time, and the air extraction efficiency of the battery cell is further improved.
In some embodiments of the present application, the connecting piece includes a first body portion and a first positioning portion, the first body portion has the first liquid injection hole and the first channel, and the first positioning portion is disposed on the first body portion;
the current collector comprises a second body part and a second positioning part, the second body part is provided with the second liquid injection hole, the second positioning part is arranged on the second body part, and the second positioning part is matched with the first positioning part so that the current collector is connected with the connecting piece.
In the embodiment of the application, the connecting piece is positioned on the current collecting piece through the cooperation of the second positioning part and the first positioning part, and then the connecting piece is fixedly connected with the current collecting piece in a welding mode. Because the connecting piece and the current collecting piece are positioned through the matching of the second positioning part and the first positioning part before the connecting piece and the current collecting piece are welded, the welding position can be accurately identified during welding, and therefore the welding efficiency is effectively improved.
Further, the first positioning portion comprises two positioning columns, the two positioning columns are arranged on the second surface, the two positioning columns are respectively arranged on two sides of the first channel, the second positioning portion comprises two positioning holes, and the two positioning columns are respectively inserted into the two positioning holes.
In the embodiment of the application, through setting up first location portion is the reference column, second location portion is the locating hole, the reference column inserts the locating hole can make the connecting piece is accurate to be located on the collector, through with two the reference column set up respectively in the both sides of first passageway, and insert two locating holes, can improve the stability and the reliability of collector assembly.
Further, the first location portion is the reference column, the second location portion is the locating hole, the locating hole is the through-hole, the reference column inserts the through-hole, the collector still includes at least one connecting portion, connecting portion is followed the second body portion deviates from one side protrusion of connecting piece, connecting portion deviates from the terminal surface parallel and level of second body portion is in first location portion deviates from the terminal surface of first body portion or than first location portion deviates from the terminal surface of first body portion is more kept away from second body portion.
In the embodiment of the application, through setting up the connecting portion deviates from the terminal surface parallel and level of second body portion is less than first location portion deviates from the terminal surface of first body portion or than first location deviates from the terminal surface of first body portion is more kept away from second body portion, can avoid first location portion with electrode assembly butt, and then influence connecting portion with electrode assembly's connection effect.
Further, the first liquid injection hole extends from the geometric center of the first surface to the geometric center of the second surface of the connecting piece, the second liquid injection hole is located at the geometric center of the current collecting piece, the current collecting piece comprises a plurality of connecting parts, the current collecting piece is provided with a central area, the geometric center of the current collecting piece and the second positioning parts are located at the central area, and the plurality of connecting parts are arranged around the central area and extend from the central area to the periphery of the current collecting piece.
In the embodiment of the application, the first liquid injection hole extends from the geometric center of the first surface to the geometric center of the second surface of the connecting piece, and the second liquid injection hole is positioned at the geometric center of the current collecting piece, so that the positioning and the assembly between the connecting piece and the current collecting piece are facilitated. Through setting up a plurality of connecting portions encircle the central zone sets up and from the central zone to the periphery of collector extends, can guarantee the collector with electrode assembly is close to effective connection between the utmost point ear in a plurality of positions on the terminal surface of collector to realize the abundant switch-on of electric current improves the reliability of battery monomer.
Further, the second body portion has a plurality of through holes, and the plurality of through holes are located between any two adjacent connection portions.
In the embodiment of the application, by arranging the through hole, when thermal runaway occurs in the battery cell, the gas generated by the electrode assembly can be discharged into the space between the end cover and the current collector through the through hole, and then the release of pressure is realized.
In some embodiments of the present application, at least one diversion trench is disposed on a side surface of the current collector facing away from the connecting piece, the diversion trench is communicated with the second liquid injection hole, and the diversion trench extends from the second liquid injection hole to the periphery of the current collector.
In the embodiment of the application, through set up with the guiding gutter of second notes liquid hole intercommunication, electrolyte passes through after the second notes liquid hole is poured into, along the guiding gutter to the periphery circulation of mass flow piece makes electrode assembly is close to the terminal surface of mass flow assembly just in time and fully with electrolyte contact, thereby improve electrolyte infiltration efficiency and infiltration effect.
In some embodiments of the present application, the current collector includes a second body portion and at least one support portion, the support portion is disposed at a periphery of the second body portion and located at a side of the second body portion facing the connecting member, and a height of the support portion is smaller than a height of the connecting member along a thickness direction of the second body portion.
In the embodiment of the application, the supporting part can support the second body part by arranging the supporting part, so that the current collecting assembly is prevented from being deformed to cause the safety problem of the battery cell.
Embodiments of a second aspect of the present application provide a battery cell comprising:
the shell comprises a containing cavity and an opening;
an electrode assembly accommodated in the accommodation chamber;
an end cap covering the aperture;
and the connecting part is connected with the end cover, a second channel is formed between the current collector and the end cover, and the second channel is communicated with the first channel. The current collecting assembly is described in the previous embodiments, and will not be described herein.
In the embodiment of the present application, by forming the second channel between the current collector and the end cap, when thermal runaway of the battery cell occurs, the gas generated from the electrode assembly may enter the second channel, thereby achieving pressure release. Through the second passageway with first passageway intercommunication is when the battery monomer is in the time of taking out, be located gas in the second passageway can be directly through first passageway with first notes liquid hole intercommunication, and then will gas in the second passageway is discharged to the battery monomer is outside to improve the efficiency of taking out.
Further, the end cover is provided with a mounting hole; the connecting piece comprises a first section and a second section, the first section is inserted into the mounting hole to be connected with the end cover, at least part of the surface of the first section is exposed out of the end cover, one end, close to the first section, of the second section is abutted to the end cover, one end, far away from the first section, of the second section is connected with the current collecting piece, and the second section is used for spacing the end cover from the current collecting piece to form the second channel.
In one aspect, at least part of the surface of the first section is exposed out of the end cover, so that the first liquid injection hole is communicated with the outside of the battery cell, and gas inside the battery cell is conveniently pumped out of the battery cell. On the other hand, when the current collecting assembly is connected with the end cover in a welding mode, at least part of the surface of the first section is exposed out of the end cover, so that the welding position of the current collecting assembly and the end cover is positioned outside the battery cell, the welding position of the current collecting assembly and the end cover is conveniently confirmed, and the welding efficiency and the welding effect are improved.
Embodiments of a third aspect of the present application provide a battery pack comprising:
box body
At least one battery cell, the battery cell hold in the box. The battery cells are described in the foregoing embodiments, and are not described in detail herein.
The battery pack effectively improves production efficiency and safety by adopting the battery cells according to various embodiments of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a current collecting assembly according to one embodiment of the present disclosure;
fig. 2 is an exploded perspective view of the header assembly of fig. 1;
FIG. 3 is a schematic perspective view of the connector of FIG. 1;
fig. 4 is a top view of the header assembly shown in fig. 1;
FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 4;
fig. 6 is a bottom view of the header assembly of fig. 1;
fig. 7 is a schematic perspective view of a battery cell according to an embodiment of the present disclosure;
fig. 8 is an exploded perspective view of the battery cell shown in fig. 7;
FIG. 9 is a schematic cross-sectional view taken along line B-B in FIG. 7;
fig. 10 is a schematic perspective view of a battery pack according to an embodiment of the present application.
Reference numerals illustrate:
100-the number of the battery cells,
110-housing, 111-receiving cavity, 112-opening,
120-electrode assembly, 121-central bore,
130-end caps, 131-mounting holes,
140-current collecting component, 141-connecting piece, 1411-first surface, 1412-second surface, 1413-peripheral side surface, 1414-first liquid injection hole, 1415-first channel, 1415 a-opening, 1416-first body portion, 1417-first positioning portion, 1418-first section, 1419-second section, 142-current collecting piece, 1421-second liquid injection hole, 1422-second body portion, 1423-second positioning portion, 1424-connecting portion, 1425-central zone, 1426-through hole, 1427-guiding groove, 1428-supporting portion,
150-a second channel;
200-battery pack, 210-box.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus. The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
It should be noted that, for convenience of explanation, in the embodiments of the present application, like reference numerals denote like components, and for brevity, detailed explanation of the like components is omitted in different embodiments.
Referring to fig. 1 to 3, fig. 1 is a schematic perspective view of a current collecting assembly according to an embodiment of the present application; fig. 2 is an exploded perspective view of the header assembly of fig. 1; fig. 3 is a perspective view of the connector of fig. 1. Embodiments of the first aspect of the present application provide a current collecting assembly 140, the current collecting assembly 140 including a connector 141 and a current collecting member 142. The connector 141 has a first surface 1411, a second surface 1412, and a peripheral side 1413. The second surface 1412 is disposed opposite to the first surface 1411, and the peripheral surface 1413 is bent and connected between the first surface 1411 and the second surface 1412. The connector 141 further has a first liquid injection hole 1414 penetrating the first surface 1411 and the second surface 1412, and a first passage 1415 communicating the first liquid injection hole 1414 with at least one opening 1415a formed in the peripheral side surface 1413. That is, the connecting member 141 further has a first passage 1415 having an opening 1415a on the peripheral side surface 1413, and the first passage 1415 communicates with the first filling hole 1414. The current collector 142 is disposed adjacent to the second surface 1412, and the current collector 142 is connected to the connecting member 141, the current collector 142 has a second injection hole 1421, and the second injection hole 1421 communicates with the first injection hole 1414.
It should be noted that, the current collecting assembly 140 according to the embodiment of the present application may be applied to the battery cell 100 (refer to fig. 8), and the current collecting assembly 140 is described as an example of application to the battery cell 100 in each embodiment of the present application. Of course, in other embodiments, the current collecting assembly 140 described herein may be applied to other situations where current collecting or guiding is required, and the use of the current collecting assembly 140 described herein is not limited herein.
Specifically, in some embodiments of the present application, the battery cell 100 includes an end cap 130 and an electrode assembly 120 (see fig. 8), and the electrode assembly 120 has a center hole 121 penetrating the electrode assembly 120 and located at a center of the electrode assembly 120. The current collecting assembly 140 is mounted between the end cap 130 and the electrode assembly 120 for making electrical connection between the end cap 130 and the electrode assembly 120. Of course, in other embodiments, the current collecting assembly 140 may also be used to implement an electrical connection between the electrode assembly 120 and an electrical connector (not shown) external to the battery cells 100, the electrical connector being used to implement a series-parallel connection between a plurality of the battery cells 100, in which case the current collecting assembly 140 is disposed insulated from the end cap 130.
Referring to fig. 4 and 5, fig. 4 is a top view of the current collecting assembly shown in fig. 1; fig. 5 is a schematic cross-sectional view taken along line A-A in fig. 4. When the battery cell 100 is filled with electrolyte, the electrolyte flows through the first filling hole 1414 and the second filling hole 1421 in sequence, and then enters the central hole 121 (see fig. 8), so as to infiltrate the electrode assembly 120. In order to make the pressure difference between the inside of the battery cell 100 and the space where the electrolyte is located, so that the electrolyte enters the inside of the battery cell 100 by means of the pressure difference, the battery cell 100 needs to be pumped, so that the battery cell 100 is in a negative pressure state. When the battery cell 100 is pumped, the pumping path of the air between the end cap 130 and the current collector 142 is: from the side of the electrode assembly 120, enters the central hole 121 of the electrode assembly 120, and sequentially passes through the second injection hole 1421 and the first injection hole 1414 to be withdrawn to the outside of the battery cell 100.
Therefore, in one aspect, the current collecting assembly 140 of the present application is provided with the first liquid injecting hole 1414, so that the liquid injecting position of the battery cell 100 is integrated on the current collecting assembly 140, so that the overall structure of the battery cell 100 is more compact, and the electrolyte is more convenient to be injected into the battery cell 100. On the other hand, since the path of the air between the end cap 130 and the current collector 142 to the first liquid injection hole 1414 is long, if the battery cell 100 is directly pumped from the first liquid injection hole 1414, pumping efficiency is low. According to the current collecting assembly 140 provided by the embodiment of the application, the first channel 1415 is arranged, the first channel 1415 is communicated with the first liquid injecting hole 1414, and air between the end cover 130 and the current collecting piece 142 can be directly pumped out to the outside of the battery cell 100 through the first channel 1415, so that an air pumping path is effectively shortened, air pumping efficiency is improved, and production efficiency of the battery cell 100 is improved.
With continued reference to fig. 3, in some embodiments of the present application, the first channel 1415 is a recess formed in the second surface 1412. That is, the second surface 1412 is recessed toward the first surface 1411 to form the first channel 1415. It will be appreciated that by locating the first channel 1415 on the second surface 1412, machining of the first channel 1415 is facilitated, thereby improving the machining efficiency of the manifold assembly 140.
Specifically, the cross section of the first channel 1415 along the thickness direction of the connecting member 141 may be semicircular, and when the cross section of the first channel 1415 is semicircular, the diameter of the first channel 1415 may be set to be greater than or equal to the diameter of the first liquid injection hole 1414. By providing the first channel 1415 with a semicircular cross section, machining of the first channel 1415 can be facilitated; by setting the diameter of the first channel 1415 to be greater than or equal to the diameter of the first liquid injection hole 1414, the air extraction efficiency of the battery cell 100 can be further improved, and the liquid injection efficiency and the electrolyte infiltration effect after liquid injection of the battery cell 100 can be further improved. Of course, in other embodiments, the diameter of the first channel 1415 may be smaller than the diameter of the first fill hole 1414. In other embodiments, the cross-section of the first channel 1415 along the extending direction of the first filling hole 1414 may be any other shape, such as arc, rectangle, triangle, or other irregular shape.
Further, the first channel 1415 penetrates the peripheral side surface 1413 and communicates the first liquid injection hole 1414 with two openings 1415a formed in the peripheral side surface 1413. That is, the first passage 1415 penetrates the peripheral side surface 1413 to form two of the openings 1415a in the peripheral side surface 1413 such that the first liquid injection hole 1414 communicates with the two openings 1415 a. As can be appreciated, by disposing the first channel 1415 to penetrate the peripheral side 1413 and communicating the first injection hole 1414 with two openings 1415a formed in the peripheral side 1413, air between the end cap 130 and the current collector 142 is facilitated to enter the first injection hole 1414 through the two openings 1415a at the same time, thereby further improving the pumping efficiency of the battery cell 100.
Referring to fig. 2 and 3 together, in some embodiments of the present application, the connecting member 141 includes a first body portion 1416 and a first positioning portion 1417, the first body portion 1416 has the first filling hole 1414 and the first channel 1415, and the first positioning portion 1417 is disposed on the first body portion 1416. The current collector 142 includes a second body portion 1422 and a second positioning portion 1423, the second body portion 1422 has the second injection hole 1421, the second positioning portion 1423 is disposed on the second body portion 1422, and the second positioning portion 1423 cooperates with the first positioning portion 1417 to connect the current collector 142 to the connecting member 141.
Specifically, the connecting piece 141 is positioned on the current collecting piece 142 through the cooperation of the second positioning portion 1423 and the first positioning portion 1417, and then the connecting piece 141 is fixedly connected with the current collecting piece 142. For example, the connector 141 may be fixedly connected to the current collector 142 by, but not limited to, welding or bonding. Because the connecting member 141 and the current collecting member 142 are already positioned by the cooperation of the second positioning portion 1423 and the first positioning portion 1417 before the connecting member 141 and the current collecting member 142 are welded, the welding position can be accurately identified during welding, thereby effectively improving the welding efficiency.
It will be appreciated that in other embodiments, the connecting member 141 and the current collecting member 142 may be integrally formed, i.e., the current collecting assembly 140 is an integrally formed component, so as to reduce the processing steps of the current collecting assembly 140 and improve the processing efficiency of the battery cell 100.
Further, the first positioning portion 1417 includes two positioning posts, the two positioning posts are disposed on the second surface 1412, the two positioning posts are disposed on two sides of the first channel 1415, the second positioning portion 1423 includes two positioning holes, and the two positioning posts are inserted into the two positioning holes, respectively.
It can be appreciated that, by setting the first positioning portion 1417 as a positioning post, the second positioning portion 1423 as a positioning hole, and inserting the positioning post into the through hole, the connecting piece 141 can be precisely positioned on the current collecting piece 142, and by setting two positioning posts on two sides of the first channel 1415 respectively and inserting the two positioning holes, stability and reliability of assembling the current collecting assembly 140 can be improved.
With continued reference to fig. 5, further, the first positioning portion 1417 is a positioning post, the second positioning portion 1423 is a positioning hole, the positioning hole is a through hole, the positioning post is inserted into the through hole, the current collecting member 142 further includes at least one connecting portion 1424, the connecting portion 1424 protrudes from a side of the second body portion 1422 away from the connecting member 141, and an end surface of the connecting portion 1424 away from the second body portion 1422 is flush with an end surface of the first positioning portion 1417 away from the first body portion 1416 or is further away from the second body portion 1422 than an end surface of the first positioning portion 1417 away from the first body portion 1416. That is, the end surface of the connecting portion 1424 facing away from the second body portion 1422 protrudes or is flush with the end surface of the first positioning portion 1417 facing away from the first body portion 1416.
Specifically, the connection part 1424 protrudes from a side of the second body part 1422 facing away from the connection member 141, so as to achieve connection between the current collecting assembly 140 and the electrode assembly 120. The end surface of the connection portion 1424 facing away from the second body portion 1422, that is, the end surface of the connection portion 1424 farthest from the second body portion 1422 in the thickness direction of the second body portion 1422; the first positioning portion 1417 faces away from the end face of the first body portion 1416, that is, the end face of the first positioning portion 1417 furthest from the first body portion 1416 in the thickness direction of the first body portion 1416. By setting the end face of the connecting portion 1424 away from the second body portion 1422 is flush with the end face of the first positioning portion 1417 away from the first body portion 1416 or is far away from the second body portion 1422 than the end face of the first positioning portion 1417 away from the first body portion 1416, the first positioning portion 1417 can be prevented from abutting against the electrode assembly 120, and the connection effect of the connecting portion 1424 and the electrode assembly 120 is further affected.
Referring to fig. 2, further, the first injection hole 1414 extends from a geometric center of the first surface 1411 to a geometric center of the second surface 1412 of the connecting member 141, the second injection hole 1421 is located at a geometric center of the current collecting member 142, the current collecting member 142 includes a plurality of connecting portions 1424, the current collecting member 142 has a central region 1425, the geometric center of the current collecting member 142 and the second positioning portion 1423 are located at the central region 1425, and the plurality of connecting portions 1424 are disposed around the central region 1425 and extend from the central region 1425 to a periphery of the current collecting member 142.
It will be appreciated that positioning and assembly between the connector 141 and the manifold 142 is facilitated by providing the first fill port 1414 to extend from the geometric center of the first surface 1411 of the connector 141 to the geometric center of the second surface 1412, with the second fill port 1421 being located at the geometric center of the manifold 142. By providing the plurality of connection parts 1424 around the central region 1425 and extending from the central region 1425 to the periphery of the current collector 142, effective connection between the current collector 142 and the tabs of the electrode assembly 120 at a plurality of positions on the end surface near the current collector 142 can be ensured, thereby achieving sufficient conduction of current and improving reliability of the battery cell 100.
Further, the second body portion 1422 has a plurality of through holes 1426, and the plurality of through holes 1426 are located between any two adjacent connection portions 1424. As can be appreciated, when thermal runaway occurs in the battery cell 100, the gas generated from the electrode assembly 120 may be discharged into the space between the end cap 130 and the current collector 142 through the through-holes 1426, thereby accomplishing pressure release.
Specifically, if the thermal runaway degree of the battery cell 100 is slight, the amount of gas generated by the battery cell 100 is small, and the gas enters the space between the end cover 130 and the current collector 142 to release the pressure, thereby avoiding potential safety hazards caused by the excessive pressure inside the battery cell 100. If the thermal runaway of the battery cell 100 is severe, the amount of gas generated by the battery cell 100 is large, the gas generated by the electrode assembly 120 enters the space between the end cap 130 and the current collector 142, and when the internal pressure of the battery cell 100 is higher than a set threshold value, the gas is flushed out of an explosion-proof valve (not shown) on the end cap 130 and discharged to the outside of the battery cell 100, so as to release the internal pressure of the battery cell 100 and improve the safety of the battery cell 100.
Referring to fig. 6, fig. 6 is a bottom view of the header assembly of fig. 1. In some embodiments of the present application, at least one flow guiding groove 1427 is disposed on a side surface of the current collecting member 142 facing away from the connecting member 141, the flow guiding groove 1427 is in communication with the second liquid injecting hole 1421, and the flow guiding groove 1427 extends from the second liquid injecting hole 1421 to the periphery of the second current collecting component 140. As can be appreciated, since the current collecting assembly 140 is adjacent to the electrode assembly 120, the electrolyte directly flows into the central hole 121 along the second injection hole 1421 during injection, and the end surface of the electrode assembly 120 near the current collecting assembly 140 is difficult to contact with the electrolyte in time, thereby affecting the impregnation efficiency of the electrolyte. Through set up with the guiding gutter 1427 of second annotate liquid hole 1421 intercommunication, the electrolyte is through after annotating through second annotate liquid hole 1421 is annotated, along guiding gutter 1427 to the periphery circulation of current collector 142 for electrode assembly 120 is close to the terminal surface of current collector assembly 140 just in time and fully contacts with the electrolyte, thereby improves electrolyte infiltration efficiency and infiltration effect.
With continued reference to fig. 5, in some embodiments of the present application, the current collecting member 142 includes a second body portion 1422 and at least one supporting portion 1428, where the supporting portion 1428 is disposed on a periphery of the second body portion 1422 and is located on a side of the second body portion 1422 facing the connecting member 141, and a height of the supporting portion 1428 is smaller than a height of the connecting member 141 along a thickness direction of the second body portion 1422.
As can be appreciated, when the current collecting assembly 140 is disposed at the bottom of the battery cell 100, that is, when the current collecting assembly 140 carries the electrode assembly 120, the current collecting assembly 140 is at risk of being deformed by being pressed due to the weight of the electrode assembly 120, and by providing the supporting portion 1428, the supporting portion 1428 can support the second body portion 1422, thereby preventing the current collecting assembly 140 from being deformed and thus causing a safety problem of the battery cell 100. Of course, in other embodiments, the current collecting assembly 140 may also be disposed on top of the battery cell 100.
Referring to fig. 7 to fig. 9 together, fig. 7 is a schematic perspective view of a battery cell according to an embodiment of the disclosure; fig. 8 is an exploded perspective view of the battery cell shown in fig. 7; fig. 9 is a schematic cross-sectional view taken along line B-B in fig. 7. The second side embodiment of the present application provides a battery cell 100, where the battery cell 100 includes a case 110, an electrode assembly 120, an end cap 130, and at least one current collecting assembly 140. The case 110 includes a receiving cavity 111 and an opening 112, the electrode assembly 120 is received in the receiving cavity 111, and the end cap 130 covers the opening 112. The connector 141 is connected to the end cap 130, and a second channel 150 is formed between the current collector 142 and the end cap 130, and the second channel 150 communicates with the first channel 1415. The current collecting module 140 is described in the previous embodiments, and will not be described herein.
As can be appreciated, by forming the second channel 150 between the current collecting assembly 140 and the end cap 130, when thermal runaway of the battery cell 100 occurs, the gas generated from the electrode assembly 120 may enter the second channel 150, thereby achieving pressure release. If the thermal runaway degree of the battery cell 100 is slight, the amount of gas generated by the battery cell 100 is small, and the gas enters the second channel 150 to release the pressure, thereby avoiding potential safety hazards caused by the excessive pressure inside the battery cell 100. If the thermal runaway of the battery cell 100 is severe, the amount of gas generated by the battery cell 100 is large, the gas generated by the electrode assembly 120 passes through the second channel 150, and when the internal pressure of the battery cell 100 is higher than the set threshold, the gas is flushed out of the explosion-proof valve on the end cover 130 and is discharged to the outside of the battery cell 100, so as to release the internal pressure of the battery cell 100 and improve the safety of the battery cell 100. Through the communication between the second channel 150 and the first channel 1415, when the battery cell 100 is being pumped, the gas in the second channel 150 may be directly communicated with the first liquid injection hole 1414 through the first channel 1415, so as to exhaust the gas in the second channel 150 to the outside of the battery cell 100, thereby improving the pumping efficiency.
Further, the end cap 130 is provided with a mounting hole 131; the connector 141 includes a first section 1418 and a second section 1419, the first section 1418 is inserted into the mounting hole 131 to be connected with the end cap 130, at least part of the surface of the first section 1418 is exposed out of the end cap 130, one end of the second section 1419 near the first section 1418 is abutted with the end cap 130, one end of the second section 1419 far away from the first section 1418 is connected with the current collector 142, and the second section 1419 spaces the end cap 130 from the current collector 142 to form the second channel 150.
In one aspect, at least a portion of the surface of the first section 1418 is exposed to the end cap 130, such that the first fluid injection hole 1414 communicates with the exterior of the battery cell 100, facilitating extraction of the gas inside the battery cell 100 to the exterior of the battery cell 100. On the other hand, when the current collecting assembly 140 is connected to the end cap 130 by welding, at least a portion of the surface of the first section 1418 is exposed from the end cap 130, so that the welding position of the current collecting assembly 140 and the end cap 130 is located outside the battery cell 100, and the welding position of the current collecting assembly 140 and the end cap 130 is conveniently confirmed, thereby improving the welding efficiency and the welding effect. Of course, in other embodiments, the connection manner of the current collecting module 140 and the end cap 130 may be other manners than welding, which is not limited herein.
Referring to fig. 10, fig. 10 is a schematic perspective view of a battery pack according to an embodiment of the present disclosure. In a third aspect of the present application, a battery pack 200 is provided, where the battery pack 200 includes a case 210 and at least one battery cell 100, and the battery cell 100 is accommodated in the case 210. The battery cell 100 is described in the previous embodiments, and is not described herein. The battery pack 200 effectively improves the production efficiency and the safety by adopting the battery cell 100 according to various embodiments of the present application.
Reference in the present application to "an embodiment," "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the embodiments of the present application may be combined arbitrarily without any conflict with each other to form yet another embodiment without departing from the spirit and scope of the present application.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or equivalent replaced without departing from the spirit and scope of the technical solution of the present application.
Claims (13)
1. A current collecting assembly, the current collecting assembly comprising:
the connecting piece is provided with a first surface, a second surface and a peripheral side surface, wherein the second surface is opposite to the first surface, the peripheral side surface is bent and connected between the first surface and the second surface, the connecting piece is also provided with a first liquid injection hole penetrating through the first surface and the second surface, and a first channel for communicating the first liquid injection hole with at least one opening formed on the peripheral side surface; a kind of electronic device with high-pressure air-conditioning system
The current collector is arranged adjacent to the second surface and connected with the connecting piece, and is provided with a second liquid injection hole which is communicated with the first liquid injection hole.
2. The current collector assembly of claim 1 wherein the first channel is a depression formed in the second surface.
3. The manifold assembly according to claim 1 or 2, wherein said first channel extends through said peripheral side surface and communicates said first injection port with two openings formed in said peripheral side surface.
4. The manifold assembly of claim 1, wherein the connector comprises a first body portion having the first fluid injection hole and the first channel and a first positioning portion disposed on the first body portion;
the current collector comprises a second body part and a second positioning part, the second body part is provided with the second liquid injection hole, the second positioning part is arranged on the second body part, and the second positioning part is matched with the first positioning part so that the current collector is connected with the connecting piece.
5. The current collecting assembly according to claim 4, wherein the first positioning portion comprises two positioning posts disposed on the second surface, the two positioning posts being disposed on two sides of the first channel, respectively, and the second positioning portion comprises two positioning holes, the two positioning posts being inserted into the two positioning holes, respectively.
6. The current collecting assembly of claim 4, wherein the first positioning portion is a positioning post, the second positioning portion is a positioning hole, the positioning hole is a through hole, the positioning post is inserted into the positioning hole, the current collecting member further comprises at least one connecting portion, the connecting portion protrudes from one side of the second body portion facing away from the connecting member, and an end face of the connecting portion facing away from the second body portion is flush with an end face of the first positioning portion facing away from the first body portion or is further away from the second body portion than an end face of the first positioning portion facing away from the first body portion.
7. The manifold assembly of claim 5 or 6, wherein the first fluid injection hole extends from a geometric center of the first surface to a geometric center of the second surface of the connector, the second fluid injection hole is positioned at the geometric center of the manifold, the manifold includes a plurality of connection portions, the manifold has a central region, the geometric center of the manifold and the second positioning portion are positioned at the central region, and the plurality of connection portions are positioned around the central region and extend from the central region to a periphery of the manifold.
8. The current collecting assembly according to claim 7, wherein the second body portion has a plurality of through holes located between any two adjacent ones of the connection portions.
9. The manifold assembly of claim 1, wherein the manifold has at least one flow guide slot on a side surface facing away from the connector, the flow guide slot being in communication with the second fluid injection hole and the flow guide slot extending from the second fluid injection hole toward the periphery of the manifold assembly.
10. The current collecting assembly according to claim 1, wherein the current collecting member comprises a second body portion and at least one supporting portion provided at a peripheral edge of the second body portion and located at a side of the second body portion facing the connection member, and a height of the supporting portion is smaller than a height of the connection member in a thickness direction of the second body portion.
11. A battery cell, comprising:
the shell comprises a containing cavity and an opening;
an electrode assembly accommodated in the accommodation chamber;
an end cap covering the aperture;
the manifold assembly of claims 1-10, said connector being connected to said end cap with a second passageway formed therebetween, said second passageway being in communication with said first passageway.
12. The battery cell of claim 11, wherein the end cap is provided with a mounting hole; the connecting piece comprises a first section and a second section, the first section is inserted into the mounting hole to be connected with the end cover, at least part of the surface of the first section is exposed out of the end cover, one end, close to the first section, of the second section is abutted to the end cover, one end, far away from the first section, of the second section is connected with the current collecting piece, and the second section is used for spacing the end cover from the current collecting piece to form the second channel.
13. A battery pack, comprising:
box body
At least one battery cell according to claim 11 or 12, which is accommodated in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310075341.4A CN116053710A (en) | 2023-01-16 | 2023-01-16 | Current collecting assembly, battery monomer and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310075341.4A CN116053710A (en) | 2023-01-16 | 2023-01-16 | Current collecting assembly, battery monomer and battery pack |
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| CN116053710A true CN116053710A (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310075341.4A Pending CN116053710A (en) | 2023-01-16 | 2023-01-16 | Current collecting assembly, battery monomer and battery pack |
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| Country | Link |
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| CN (1) | CN116053710A (en) |
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