CN218997003U - Battery monomer, energy storage device and electric equipment - Google Patents

Battery monomer, energy storage device and electric equipment Download PDF

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Publication number
CN218997003U
CN218997003U CN202223169377.9U CN202223169377U CN218997003U CN 218997003 U CN218997003 U CN 218997003U CN 202223169377 U CN202223169377 U CN 202223169377U CN 218997003 U CN218997003 U CN 218997003U
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CN
China
Prior art keywords
end cover
battery cell
current collecting
electrode assembly
tray
Prior art date
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Active
Application number
CN202223169377.9U
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Chinese (zh)
Inventor
熊永锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Hithium Energy Storage Technology Co Ltd
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Xiamen Hithium Energy Storage Technology Co Ltd
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Application filed by Xiamen Hithium Energy Storage Technology Co Ltd filed Critical Xiamen Hithium Energy Storage Technology Co Ltd
Priority to CN202223169377.9U priority Critical patent/CN218997003U/en
Application granted granted Critical
Publication of CN218997003U publication Critical patent/CN218997003U/en
Priority to PCT/CN2023/129379 priority patent/WO2024114289A1/en
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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
    • 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
    • H01M50/10—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
    • H01M50/20—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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/342—Non-re-sealable arrangements
    • 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
    • H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
    • H01M50/367—Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems
    • 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
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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)
  • Aviation & Aerospace Engineering (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

The utility model discloses a battery monomer, an energy storage device and electric equipment, wherein the battery monomer comprises: a housing, an electrode assembly, an end cap, and a current collecting plate. The shell is provided with an opening, a containing cavity is arranged in the shell, the electrode assembly is contained in the containing cavity, the end cover covers the opening to seal the containing cavity, and the end cover is integrally formed with an explosion-proof valve; a current collecting tray physically and electrically connected between the end cap and the electrode assembly, the current collecting tray comprising: the separation table is at least partially pushed against the end cover, so that the end cover is spaced apart from the tray body, a pressure release channel is defined between the end cover and the tray body, and the tray body is provided with an exhaust hole penetrating in the thickness direction and communicated with the pressure release channel. Therefore, the pressure release channel is defined between the end cover and the current collecting disc, and the explosion-proof valve is arranged on the end cover, so that the pressure can be released in time when the battery monomer is out of control, explosion of the battery monomer is prevented, and the safety is improved.

Description

Battery monomer, energy storage device and electric equipment
Technical Field
The utility model relates to the field of secondary batteries, in particular to a battery monomer, an energy storage device and electric equipment.
Background
The battery cell generally comprises a shell, an electrode assembly, an end cover and a current collecting disc, wherein the electrode assembly is arranged in the shell, a lug on the electrode assembly is connected with the end cover through the current collecting disc, so that current conduction is realized, and the end cover is arranged on the outer side of the current collecting disc and is connected with the end cover to realize the sealing of the battery cell.
In the prior art, the end cover and the current collecting disc are tightly attached, when the battery is out of control, gas can be generated in the electrode assembly, if the gas in the shell is not discharged in time, the internal pressure of the battery can be too high, and the risk of explosion exists.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery cell that can timely discharge gas when thermal runaway of the battery occurs, reduce internal pressure of the battery, and improve safety.
Another object of the present utility model is to provide an energy storage device having the above battery cell.
A further object of the utility model is to propose a powered device having an energy storage device as described above.
According to an embodiment of the first aspect of the present utility model, a battery cell includes: a housing, an electrode assembly, an end cap, and a current collecting plate. The shell is provided with an opening, a containing cavity is arranged in the shell, the electrode assembly is contained in the containing cavity, the end cover covers the opening to seal the containing cavity, and an explosion-proof valve is integrally formed on the end cover; the current collecting plate is physically and electrically connected between the end cap and the electrode assembly, the current collecting plate comprising: the separation table is at least partially pushed against the end cover, so that the end cover is spaced apart from the disc body, a pressure release channel is defined between the end cover and the disc body, and the disc body is provided with an exhaust hole penetrating in the thickness direction of the disc body and communicated with the pressure release channel.
According to the battery cell of the embodiment of the first aspect of the utility model, the electrode assembly is arranged in the accommodating cavity of the shell, the current collecting disc is connected with the electrode assembly, and the end cover covers the outer side of the current collecting disc and is connected with the shell to seal the accommodating cavity, so that the battery cell forms a closed shell. The separation platform on the collecting tray is used for separating the end cover from the collecting tray, so that a pressure release channel is formed between the end cover and the collecting tray. When the battery monomer takes place thermal runaway, the inside gas that can produce of electrode assembly, the exhaust hole on the gaseous accessible disk body gets into the pressure release passageway, if the thermal runaway degree of battery monomer is comparatively slight, the release of pressure can be realized through the exhaust hole entering pressure release passageway to gaseous when the gaseous volume that produces of battery monomer is less, thereby avoid the too high potential safety hazard that produces of battery monomer internal pressure, if the thermal runaway degree of battery monomer is comparatively violent, the gaseous volume that produces of battery monomer is great, gas is produced by electrode assembly and is constantly got into pressure release passageway through the exhaust hole, when the gaseous internal pressure of battery monomer is higher than the settlement threshold value, explosion-proof valve on the end cover breaks open, can make the gaseous discharge of battery inside, in order to reduce battery internal pressure, improve the security. Therefore, the pressure release channel is defined between the end cover and the current collecting disc, and the explosion-proof valve is integrally formed on the end cover, so that the pressure can be released in time when the battery monomer is out of control, explosion of the battery monomer is prevented, and the safety is improved.
In some embodiments, the spacer is 0.3mm to 3mm in height. Therefore, the pressure release channel can have sufficient space, the pressure release capacity of the battery monomer is improved, and the safety is improved.
In some embodiments, the manifold disk further comprises: the positioning table is positioned at the free end of the separation table, the positioning table stretches into the end cover to position the end cover, and the outer diameter of the positioning table is smaller than that of the separation table. Therefore, the positioning table can position the end cover, and stability of the inner structure of the battery unit is improved.
Further, the difference between the outer diameter of the separation table and the maximum outer diameter of the positioning table is not less than 1mm. Therefore, the stability of the electric connection between the current collecting disc and the end cover can be improved.
Optionally, the tray body is further provided with at least one mounting groove which is positioned on the circumferential side of the positioning table and extends along the radial direction. Therefore, the electrode lugs on the electrode assembly can be connected with the mounting grooves, so that current conduction is realized, and the reliability of the battery cell is improved.
Further alternatively, the positioning table is located at the center of the tray body, and the collecting tray is further provided with a liquid injection hole penetrating through the positioning table, the separation table and the tray body along the thickness direction of the positioning table, and the liquid injection hole is coaxial with the collecting tray. Therefore, the liquid injection efficiency of the battery cell and the infiltration efficiency of the electrode assembly can be improved.
In some embodiments, the positioning table is provided with a recess, and the liquid injection hole is formed at the bottom of the recess. Therefore, diversion can be provided for the electrolyte, and the liquid injection efficiency is improved.
In some embodiments, the end cap further comprises: the explosion-proof valve comprises a first flange and a second flange, wherein the first flange is positioned on the radial outer side of the explosion-proof valve, the second flange is positioned on the radial inner side of the explosion-proof valve, the second flange is matched with the positioning table, and the outer end face of the first flange is higher than the outer end face of the second flange in the height direction of the battery unit. Therefore, the height of the welding line at the second flange is lower than that of the first flange, interference is prevented when a plurality of battery cells are connected, and the stability of the connection of the battery cells is improved.
An energy storage device according to an embodiment of the second aspect of the utility model comprises a battery cell according to any of the embodiments described above.
According to a third aspect of the utility model, the electrical consumer comprises the energy storage device of the above embodiment.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is an exploded view of a battery cell according to an embodiment of the first aspect of the present utility model.
Fig. 2 is a cross-sectional view of a battery cell according to an embodiment of the first aspect of the present utility model.
Fig. 3 is a perspective view of a current collecting tray of a battery cell according to an embodiment of the first aspect of the present utility model.
Fig. 4 is a sectional view of a current collecting plate of a battery cell according to an embodiment of the first aspect of the present utility model.
Fig. 5 is a perspective view of an end cap of a battery cell according to an embodiment of the first aspect of the present utility model.
Fig. 6 is an exploded view of an energy storage device according to an embodiment of the second aspect of the present utility model.
Fig. 7 is a schematic diagram of a powered device according to an embodiment of the third aspect of the present utility model.
Reference numerals:
battery cell 100,
A housing 10,
An electrode assembly 20,
End cap 30, explosion proof valve 31, first flange 32, second flange 33
Collector tray 40, tray 41, exhaust hole 411, partition table 42, pressure release channel 43, positioning table 44, recess 441, mounting groove 45, liquid injection hole 46,
An energy storage device 200,
Powered device 300.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
The battery cell 100, the energy storage device 200, and the electrical device 300 according to the embodiment of the utility model are described below with reference to fig. 1 to 7.
As shown in fig. 1-2, a battery cell 100 according to an embodiment of the first aspect of the present utility model, the battery cell 100 includes: a case 10, an electrode assembly 20, an end cap 30, and a current collecting plate 40.
Wherein, the outer casing 10 has an opening, and there is a holding cavity in the outer casing, the electrode assembly 20 is held in the holding cavity, the end cap 30 covers the opening in order to seal the holding cavity, and the end cap 30 is integrally formed with an explosion-proof valve 31; current collecting plate 40 is physically and electrically connected between end cap 30 and electrode assembly 20, current collecting plate 40 includes: the disc 41 and the separation table 42 formed on the side of the disc 41 facing the end cover 30, the separation table 42 at least partially pushes against the end cover 30 to space the end cover 30 from the disc 41 to define a pressure release channel 43 between the end cover 30 and the disc 41, and the disc 41 has an exhaust hole 411 penetrating in the thickness direction thereof and communicating with the pressure release channel 43.
Specifically, the electrode assembly 20 is disposed in the receiving chamber of the case 10, the current collecting plate 40 is coupled to the electrode assembly 20, and the end cap 30 covers the outside of the current collecting plate 40 and is coupled to the case to seal the receiving chamber, thereby forming the battery cell 100 into a closed case. A spacer 42 on the manifold disk 40 is used to space the end cap 30 from the manifold disk 40 such that a pressure relief channel 43 is formed therebetween.
In the use process of the battery cell 100, thermal runaway may occur due to various reasons, when the thermal runaway occurs in the battery cell 100, there may be a difference in the severity of the thermal runaway reaction, and when the thermal runaway reaction of the battery cell 100 is slight, a small amount of gas may be generated inside the electrode assembly 20, resulting in an increase in the internal pressure of the battery cell 100, but due to the limited internal space of the battery, the gas cannot be discharged in time, resulting in a continuous accumulation of the internal pressure of the battery, with a risk of explosion. In addition, the thermal runaway reaction of the battery cell 100 may be severe, and a large amount of gas may be generated in the electrode assembly 20 in a short time, which has a great safety hazard if the gas in the battery cell 100 cannot be discharged in time.
When the thermal runaway occurs in the battery cell 100, the thermal runaway reaction is slight, the gas generated by the electrode assembly 20 can enter the pressure release channel 43 through the exhaust hole 411 on the tray body 41, and a small amount of gas generated by the electrode assembly 20 can be dispersed in the space of the pressure release channel 43 due to a certain space in the pressure release channel 43, so that the pressure in the battery cell 100 is kept at a lower level, and potential safety hazards caused by overhigh pressure in the battery cell 100 are avoided. When the thermal runaway reaction is severe, a large amount of gas is generated in the electrode assembly 20 in a short time, the pressure in the battery cell 100 is still continuously increased after the gas enters the pressure release channel 43 through the exhaust hole 411, and when the pressure is higher than the set threshold value, the explosion-proof valve 31 on the end cover 30 is opened, and the gas can be discharged from the opening of the explosion-proof valve 31, so that the pressure in the battery is reduced, and the safety is improved.
According to the battery cell 100 of the embodiment of the first aspect of the present utility model, the pressure release channel 43 is defined between the end cover 30 and the current collecting plate 40, and the explosion-proof valve 31 is integrally formed on the end cover 30, so that the pressure can be released in time when the battery cell 100 is out of control, the explosion of the battery cell 100 is prevented, and the safety is improved.
As shown in FIG. 2, in some embodiments, the height of the divider 42 is 0.3mm-3mm.
Specifically, the partition table 42 is located at one side of the tray body 41 facing the end cover 30, and pushes against the end cover 30, so that a pressure release channel 43 is formed between the end cover 30 and the tray body 41, and it can be understood that the axial length of the pressure release channel 43 is equal to that of the partition table 42, and the height of the partition table 42 is set between 0.3mm and 3mm, so that the pressure release channel 43 has sufficient space, and when the thermal runaway occurs in the battery cell 100, and the amount of gas generated by the thermal runaway reaction is small, sufficient pressure release space can be provided for the gas, so that the inside of the battery cell 100 maintains a lower pressure level, and the safety is improved.
The shape of the partition table 42 in the axial cross section is not particularly limited, for example, the axial cross section of the partition table 42 may be rectangular, polygonal, or circular, and the larger the contact area is, the better the supporting effect on the end cover 30 and the conducting effect of the current are, but conversely, the smaller the space of the pressure release channel 43 is, so that a balance needs to be made between the two, so long as the partition table 42 is ensured to push against the end cover 30 at one end far from the direction of the disc 41, and the arrangement may be made according to actual needs.
As shown in fig. 2-3, in some embodiments, the manifold disk 40 further includes: a locating boss 44 at the free end of the divider boss 42, the locating boss 44 extending into the end cap 30 to locate the end cap 30, the locating boss 44 having an outer diameter less than the outer diameter of the divider boss 42.
Specifically, the positioning table 44 extends into the end cover 30, so that the end cover 30 can be limited to ensure a stable interval between the end cover 30 and the current collecting plate 40, and ensure a space of the pressure release channel 43, and since the outer diameter of the positioning table 44 is smaller than that of the separation table 42, a step is formed at the joint of the positioning table 44 and the separation table 42, and the step can stably push one side of the end cover 30, which is close to the current collecting plate 40, so as to improve the stability of the internal structure of the battery cell 100.
Thus, the positioning table 44 can position the end cover 30, so as to improve the stability of the structure in the battery cell 100.
After the assembly of the battery cell 100 is completed, two sides of the current collecting disc 40 are respectively and electrically connected with the electrode assembly 20 and the end cover 30 so as to output the current in the electrode assembly 20 to the battery cell 100, and the positioning table 44 of the current collecting disc 40 extends into the end cover 30, so that the contact area between the current collecting disc 40 and the end cover 30 can be increased while the end cover 30 is positioned, the contact area is larger, the resistance is lower, the internal resistance of the battery cell 100 can be reduced, and the charge and discharge performance of the battery cell 100 is better.
Further, the difference between the outer diameter of the partition table 42 and the maximum outer diameter of the positioning table 44 is not less than 1mm. The step at the connection between the separation table 42 and the positioning table 44 can form a support for the end cover 30, and can be used for transmitting current, the difference value between the separation table 42 and the positioning table is controlled to be not less than 1mm, a larger contact area between the current collecting disc 40 and the end cover 30 can be ensured, and the connection stability of the end cover 30 and the current collecting disc 40 is improved while the electrical connection stability of the current collecting disc 40 and the end cover 30 is improved.
As shown in fig. 2-4, the disc 41 is optionally further provided with at least one radially extending mounting groove 45 located on the peripheral side of the positioning table 44.
Specifically, the electrode assembly 20 is provided with the tabs extending out of the electrode assembly 20, and the battery cell 100 can be charged and discharged through the tabs, and since the electrode assembly 20 is provided with the tabs extending out, the tabs are connected with the mounting grooves 45 of the tray 41, so that when the battery cell 100 is charged and discharged, each tab can be ensured to have current flowing therethrough, the reliability of the battery cell 100 can be improved, and the tabs are connected with at least one mounting groove 45, so that the structure of the battery cell 100 can be more compact, and the reliability of the battery cell 100 can be further improved.
Thus, the tabs on the electrode assembly 20 may be connected with the mounting grooves 45, thereby achieving current conduction and improving the reliability of the battery cell 100.
Alternatively, the plurality of mounting grooves 45 are provided in plural, and the plurality of mounting grooves 45 are provided at regular intervals along the peripheral side of the partition table 42. The plurality of mounting grooves 45 are arranged, so that the mounting grooves 45 are respectively connected with the lugs on the electrode assembly 20 in different directions of the battery cells 100, and the connection between the lugs and the current collecting plate 40 is firmer, thereby further improving the reliability of the battery cells 100.
Further alternatively, the mounting groove 45 protrudes from the surface of the disk body 41 at a side of the current collecting disk 40 adjacent to the electrode assembly 20. The mounting groove 45 protruding from the surface of the tray 41 may be in closer contact with the electrode assembly 20, thereby further improving the reliability of the battery cell 100.
Preferably, the tray 41 is further provided with a plurality of exhaust holes 411 at positions where the mounting grooves 45 are not provided, and since the mounting tray protrudes from the surface of the tray 41, the tray 41 has a gap between the positions where the mounting grooves 45 are not provided and the electrode assembly 20. When thermal runaway occurs in the battery cell 100, gas generated from the electrode assembly 20 may be discharged from the vent 411 through a gap between the tray 41 and the electrode assembly 20, thereby improving the speed of delaying the thermal runaway of the battery cell 100 and improving the safety of the battery cell 100.
As shown in fig. 4, further alternatively, the positioning table 44 is located at the center of the tray body 41, and the collecting tray 40 is further provided with a liquid injection hole 46 penetrating the positioning table 44, the partition table 42, and the tray body 41 in the thickness direction thereof, and the liquid injection hole 46 is coaxial with the collecting tray 40.
Specifically, when the battery cell 100 is assembled, it is also necessary to fill the electrolyte into the casing 10 through the electrolyte filling hole 46, and the electrolyte filling hole 46 is disposed coaxially with the partition table 42, so that the electrolyte filling hole 46 is located at the center of the tray 41, and when the electrolyte is filled, the electrolyte filling hole fills the center, so that the battery cell 100 has higher electrolyte filling efficiency, and the electrolyte flows in from the center of the electrode assembly 20, so that the impregnation efficiency of the electrode assembly 20 can be improved.
Thus, the liquid injection efficiency of the battery cell 100 and the impregnation efficiency of the electrode assembly 20 can be improved.
As shown in fig. 3-4, in some embodiments, the positioning table 44 is provided with a recess 441, and the injection hole 46 is formed at the bottom of the recess 441.
Specifically, when the battery monomer 100 is injected, electrolyte needs to be injected into the shell 10 from the injection hole 46, the positioning table 44 is provided with the concave 441 communicated with the injection hole 46, so that flow guiding can be provided for the electrolyte, and because the size of the injection hole 46 is smaller, accurate alignment is needed when the electrolyte is injected, the concave 441 is arranged on the injection hole 46, the alignment precision of the injected electrolyte can be reduced, and when the electrolyte is injected, the electrolyte can smoothly flow into the shell 10 only by ensuring that the electrolyte is in the range of the concave 441, so that the injection difficulty can be reduced, and the injection efficiency can be improved.
Therefore, the concave 441 can provide flow guiding for the electrolyte, and the difficulty of injecting the electrolyte is reduced, so that the injection efficiency is improved.
The relation between the diameter of the recess 441 and the diameter of the liquid injection hole 46 is not particularly limited, and may be adjusted according to practical needs only to ensure that the diameter of the recess 441 is larger than the diameter of the liquid injection hole 46.
Alternatively, the inner diameter of the recess 441 in the direction approaching the disk 41 is gradually reduced. Thus, the recess 441 may be inclined in the radial cross-sectional direction, and the electrolyte may be further guided when the battery cell 100 is injected, thereby improving the injection efficiency.
Optionally, the end of the injection hole 46 that communicates with the recess 441 is provided with a chamfer. When the electrolyte flows into the liquid injection hole 46 through the concave 441, the chamfer can provide further diversion for the electrolyte, so that the diversion efficiency is improved, the electrolyte is prevented from remaining in the concave 441, and the liquid injection efficiency is further improved.
Further alternatively, the end of the liquid injection hole 46 communicated with the recess 441 is provided with a round corner, and the recess 441 arranged by the round corner can provide better flow guiding effect for the electrolyte, so that the liquid injection efficiency is further improved.
As shown in fig. 5, in some embodiments, the end cap 30 further comprises: a first flange 32 positioned radially outward of the explosion-proof valve 31 and a second flange 33 positioned radially inward of the explosion-proof valve 31, the second flange 33 being fitted with the positioning table 44, and an outer end surface of the first flange 32 being higher than an outer end surface of the second flange 33 in a height direction of the battery cell 100.
Specifically, after the sealing nail seals the liquid injection hole 46, the joint between the sealing nail and the liquid injection hole 46 needs to be welded, and the second flange 33 of the end cover 30 needs to be welded with the positioning table 44, so that the battery cell 100 forms a closed structure, after the welding is completed, the welding line is located at the second flange 33 of the end cover 30, and since the outer end surface of the second flange 33 is lower than the outer end surface of the first flange 32, that is, the upper surface of the welding line is lower than the upper surface of the end cover 30, the welding line can be hidden. When assembling a plurality of battery monomers 100, the end cover 30 of the battery monomer 100 needs to be welded through the connecting sheet, so that current conduction is realized, and as the height of the welding wire is lower than that of the end cover 30, interference of the welding wire to the welding of the connecting sheet and the end cover 30 can be prevented, so that a larger welding area is ensured between the connecting sheet and the end cover 30, and the connection stability of a plurality of battery monomers 100 is improved.
Thus, the height of the weld line at the second flange 33 is lower than the height of the first flange 32, which prevents interference when the plurality of battery cells 100 are connected, and improves the stability of the connection of the battery cells 100.
Alternatively, the height of the outer end surface of the first flange 32 in the axial direction and the height of the outer end surface of the second flange 33 in the axial direction are not less than 0.2mm. Therefore, a sufficient space is provided above the second flange for hiding the bonding wires, so as to ensure that the connection stability of the battery cells 100 is improved due to the interference when the battery cells 100 are connected.
As shown in fig. 6, according to an embodiment of the second aspect of the present utility model, the energy storage device 200 includes the battery cell 100 according to any one of the above embodiments.
As shown in fig. 7, according to an embodiment of the third aspect of the present utility model, the electric device 300 includes the energy storage device 200 in the above embodiment.
In the present application, the structure of powered device 300 is not limited. For example, powered device 300 may be a mobile device such as a vehicle, a watercraft, a small aircraft, etc., that includes a power source including energy storage device 200 as described above. The power provided by the energy storage device 200 provides a driving force for the powered device 300. The mobile device may be a pure electric device, that is, the driving force of the electric device 300 is all electric energy, and the power source only includes the energy storage device 200. The mobile device may also be a hybrid power device, and the power source includes other power devices such as the energy storage device 200 and the engine. Taking a vehicle as an example, in some embodiments, the electric device 300 is a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, an extended range vehicle, an electric tricycle, a two-wheel electric vehicle, or the like.
For another example, the electric device 300 is an energy storage device such as an energy storage cabinet, and may be used as a charging cabinet of a mobile device or as an energy storage device of other devices. For example, the solar power generation equipment can be provided with an energy storage cabinet, and electric energy generated by solar power generation is temporarily stored in the energy storage cabinet so as to be used for devices such as street lamps and bus stop boards.
According to the electric equipment 300 provided by the embodiment of the utility model, by adopting the energy storage device 200, the assembly efficiency is higher, the production cost is lower, and the use cost of the electric equipment 300 can be saved.
In the description of the present utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The "first feature" and "second feature" may include one or more of the features. The meaning of "plurality" is two or more. A first feature "above" or "below" a second feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. The first feature being "above," "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery cell, comprising:
a housing (10) having an opening, said housing being provided with a receiving cavity;
an electrode assembly (20), the electrode assembly (20) being accommodated in the accommodating chamber;
the end cover (30) covers the opening to seal the accommodating cavity, and an explosion-proof valve (31) is integrally formed on the end cover (30);
a current collecting tray (40), the current collecting tray (40) being physically and electrically connected between the end cap (30) and the electrode assembly (20), the current collecting tray (40) comprising: the disc body (41) and form in the separation platform (42) of the disc body (41) towards end cover (30) one side, separation platform (42) at least partly push against in end cover (30), make end cover (30) with disc body (41) spaced apart to inject pressure release passageway (43) between end cover (30) and disc body (41), disc body (41) have along its thickness direction run through and with exhaust hole (411) of pressure release passageway (43) intercommunication.
2. The battery cell according to claim 1, wherein the height of the separator table (42) is 0.3mm-3mm.
3. The battery cell of claim 1, wherein the current collecting plate (40) further comprises: a locating stage (44) at the free end of the separating stage (42), the locating stage (44) extending into the end cap (30) to locate the end cap (30), the locating stage (44) having an outer diameter less than the outer diameter of the separating stage (42).
4. A battery cell according to claim 3, wherein the difference between the outer diameter of the separation table (42) and the maximum outer diameter of the positioning table (44) is not less than 1mm.
5. A battery cell according to claim 3, wherein the tray body (41) is further provided with at least one mounting groove (45) located on the circumferential side of the positioning table (44) and extending in the radial direction.
6. The battery cell according to claim 5, wherein the positioning table (44) is located at the center of the tray body (41), and the current collecting tray (40) is further provided with a liquid injection hole (46) penetrating through the positioning table (44), the separation table (42) and the tray body (41) in the thickness direction, and the liquid injection hole (46) is coaxial with the current collecting tray (40).
7. The battery cell according to claim 6, wherein the positioning table (44) is provided with a recess (441), and the liquid injection hole (46) is formed at the bottom of the recess (441).
8. The battery cell of claim 6, wherein the end cap (30) further comprises: a first flange (32) positioned on the radial outer side of the explosion-proof valve (31) and a second flange (33) positioned on the radial inner side of the explosion-proof valve (31), wherein the second flange (33) is matched with the positioning table (44), and the outer end surface of the first flange (32) is higher than the outer end surface of the second flange (33) in the height direction of the battery unit (100).
9. An energy storage device, comprising: the battery cell (100) of any of claims 1-8.
10. A powered device, comprising: the energy storage device (200) of claim 9.
CN202223169377.9U 2022-11-29 2022-11-29 Battery monomer, energy storage device and electric equipment Active CN218997003U (en)

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PCT/CN2023/129379 WO2024114289A1 (en) 2022-11-29 2023-11-02 Battery cell, energy storage apparatus, and electric device

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CN116404280A (en) * 2023-06-05 2023-07-07 厦门海辰储能科技股份有限公司 Energy storage device and electric equipment
CN116581443A (en) * 2023-07-14 2023-08-11 深圳海辰储能控制技术有限公司 Energy storage device and electric equipment
WO2024114289A1 (en) * 2022-11-29 2024-06-06 厦门海辰储能科技股份有限公司 Battery cell, energy storage apparatus, and electric device

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KR101810269B1 (en) * 2013-09-24 2017-12-18 주식회사 엘지화학 The secondary battery with increased bonding strength between electrode assembly and the battery case
CN209328960U (en) * 2018-12-29 2019-08-30 苏州安靠电源有限公司 Battery cap and cylindrical battery
CN110635071A (en) * 2019-04-10 2019-12-31 苏州安靠电源有限公司 Cylindrical battery and battery cap thereof
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CN217589337U (en) * 2022-06-02 2022-10-14 湖北亿纬动力有限公司 Converge dish, battery module and battery package
CN218997003U (en) * 2022-11-29 2023-05-09 厦门海辰储能科技股份有限公司 Battery monomer, energy storage device and electric equipment
CN115882129A (en) * 2022-12-20 2023-03-31 厦门海辰储能科技股份有限公司 Energy storage device and electric equipment

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WO2024114289A1 (en) * 2022-11-29 2024-06-06 厦门海辰储能科技股份有限公司 Battery cell, energy storage apparatus, and electric device
CN116404280A (en) * 2023-06-05 2023-07-07 厦门海辰储能科技股份有限公司 Energy storage device and electric equipment
CN116404280B (en) * 2023-06-05 2023-08-29 厦门海辰储能科技股份有限公司 Energy storage device and electric equipment
CN116581443A (en) * 2023-07-14 2023-08-11 深圳海辰储能控制技术有限公司 Energy storage device and electric equipment
CN116581443B (en) * 2023-07-14 2023-09-22 深圳海辰储能控制技术有限公司 Energy storage device and electric equipment

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