WO2024255046A1 - 电池单体、电池及用电装置 - Google Patents
电池单体、电池及用电装置 Download PDFInfo
- Publication number
- WO2024255046A1 WO2024255046A1 PCT/CN2023/125422 CN2023125422W WO2024255046A1 WO 2024255046 A1 WO2024255046 A1 WO 2024255046A1 CN 2023125422 W CN2023125422 W CN 2023125422W WO 2024255046 A1 WO2024255046 A1 WO 2024255046A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- shielding member
- battery cell
- way valve
- wall portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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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
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
- H01M50/636—Closing or sealing filling ports, e.g. using lids
- H01M50/645—Plugs
-
- 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
- H01M50/317—Re-sealable arrangements
- H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
-
- 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
- H01M50/317—Re-sealable arrangements
- H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
- H01M50/333—Spring-loaded vent valves
-
- 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
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- 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
-
- 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
- H01M50/317—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
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- 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
- H01M50/358—External gas exhaust passages located on the battery cover or case
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/64—Constructional details of batteries specially adapted for electric vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
Definitions
- the present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device.
- a pressure relief mechanism for releasing the internal pressure of the battery cells is generally provided on the outer shell of the battery cells, so that when the internal pressure or temperature of the battery cells reaches a threshold value, the pressure relief mechanism can be activated and release the internal pressure of the battery cells.
- the pressure relief mechanism of the existing battery cells may be activated and release the pressure in advance during use, resulting in poor stability in the use of the battery cells, which is not conducive to improving the service life and reliability of the battery cells.
- the embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the service life and reliability of the battery cell.
- an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, a one-way valve and a shielding member; the shell has a wall portion; the electrode assembly is accommodated in the shell; the one-way valve is arranged on the wall portion, and the one-way valve has an outlet, and the outlet is used to discharge the gas inside the shell; the shielding member is installed on the wall portion, along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve, and an exhaust channel is formed between the shielding member and the wall portion, and the exhaust channel connects the outlet and the outside of the shell.
- a one-way valve is arranged on the wall of the outer shell so that the one-way valve can be opened in one direction and discharge the gas inside the outer shell to the outside of the outer shell. Therefore, when gas is generated inside the outer shell during normal use of the battery cell, it can be discharged to the outside of the outer shell through the one-way valve to alleviate the phenomenon that the internal pressure of the battery cell reaches the threshold value prematurely due to the increase in the internal air pressure of the battery cell, thereby effectively improving the use stability of the battery cell, thereby improving the service life and reliability of the battery cell.
- the covering member can play a certain protective and shielding role on the one-way valve.
- it can reduce the wear or damage of the one-way valve in the external environment, and can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve, which is beneficial to increasing the service life of the one-way valve.
- covering the one-way valve by the covering member can enhance the aesthetics of the outer surface of the battery cell.
- it is convenient to connect other components such as the detection element on the side of the covering member away from the one-way valve, so as to reduce the interference of the area where the one-way valve is provided on the wall on the connection detection element and other components.
- the wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a mounting groove, the bottom surface of the mounting groove is provided with a mounting hole, at least a portion of the one-way valve is disposed in the mounting hole, and at least a portion of the shielding member is accommodated in the mounting groove.
- the mounting groove can play a certain positioning and limiting role for the shielding member, which is beneficial to reducing the difficulty of assembling the shielding member connected to the wall portion.
- the exhaust channel includes a first exhaust gap, the first exhaust gap is formed between the shielding member and a groove side surface of the mounting groove, and the first exhaust gap is used to connect the air outlet and the outside of the housing.
- a first exhaust gap connected to the outside of the shell is formed between the shielding member and the side surface of the mounting groove, so that the gas discharged from the one-way valve can be discharged to the outside of the shell through the first exhaust gap.
- the battery cell adopting this structure does not need to have a hole on the shielding member, which is beneficial to reduce the processing difficulty and can improve the appearance of the battery cell.
- the outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, and the first corner surface connects two adjacent first side surfaces;
- the groove side surface of the mounting groove includes a second corner surface and at least two second side surfaces, and the second corner surface connects two adjacent second side surfaces, each second side surface is connected to one first side surface, and the first exhaust gap is formed between the second corner surface and the first corner surface.
- first side surfaces in the outer peripheral surface of the shielding member are connected by a first corner surface
- second side surfaces in the groove side surface of the mounting groove are connected by a second corner surface
- each first side surface is connected to a second side surface
- a first gap is formed between the first corner surface and the second corner surface, that is, a first exhaust gap is formed at the corner of the shielding member and the mounting groove.
- both the first corner surface and the second corner surface are arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.
- first corner surface and the second corner surface as arc surfaces, and the radius of the first corner surface is larger than the radius of the second corner surface, a first exhaust gap is formed between the first corner surface and the second corner surface.
- the first side surface is connected to the second side surface by welding.
- the cross-section of the shielding member in a direction perpendicular to the thickness of the wall portion is rectangular, and the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, and the first exhaust gap is formed at at least one of the first corner surfaces.
- the shielding member as a rectangular plate structure, the four sides of the shielding member form four first side surfaces, and four first corner surfaces are formed at four right angles of the shielding member, the structure is simple and easy to manufacture.
- a groove is disposed on the outer peripheral surface of the shielding member, and the first exhaust gap is formed between the groove bottom surface of the groove and the groove side surface of the mounting groove.
- a groove is provided on the outer peripheral surface of the shielding member so that a first exhaust gap for exhaust is formed between the groove bottom surface of the groove and the groove side surface of the mounting groove.
- an area of the outer circumferential surface of the shielding member where the groove is not provided is welded to a groove side surface of the installation groove.
- the shielding member is connected to the side surface of the mounting groove by welding the area on the outer peripheral surface of the shielding member where no groove is provided to the side surface of the mounting groove.
- the battery cell with such a structure is beneficial to the firmness of the connection between the shielding member and the wall portion, so as to improve the structural stability of the shielding member assembled to the wall portion.
- a plurality of protrusions are convexly provided on the outer circumferential surface of the shielding member, and the plurality of protrusions are arranged at intervals along the circumference of the shielding member.
- the protrusions abut against the side surfaces of the mounting groove, and the first exhaust gap is formed between the area of the outer circumferential surface of the shielding member where the protrusions are not provided and the side surfaces of the mounting groove.
- a plurality of protrusions arranged at intervals along the circumference of the shielding member are provided on the outer peripheral surface of the shielding member, and the protrusions abut against the side surfaces of the mounting groove, so that a first exhaust gap for exhaust is formed between the area on the outer peripheral surface of the shielding member where no protrusions are provided and the side surfaces of the mounting groove. That is to say, the first exhaust gap is located between two adjacent protrusions, and the structure is simple and easy to assemble.
- the protrusion is interference fit with a groove side surface of the mounting groove.
- the shielding member is fixed in the mounting groove by interference fit between the convex portion protruding from the outer peripheral surface of the shielding member and the groove side surface of the mounting groove.
- the battery cell adopting this structure can form a first exhaust gap between two adjacent convex portions while facilitating the installation of the shielding member on the wall portion, which helps to reduce the difficulty of assembling the shielding member.
- the exhaust channel further includes a second exhaust gap, the second exhaust gap is formed between the shielding member and the bottom surface of the mounting groove, and the second exhaust gap connects the first exhaust gap and the air outlet.
- the exhaust channel also includes a second exhaust gap formed between the covering member and the bottom surface of the mounting groove, and the second exhaust gap connects the first exhaust gap and the air outlet to alleviate the phenomenon of exhaust obstruction between the air outlet and the first exhaust gap caused by the covering member abutting against the bottom surface of the mounting groove, thereby improving the smoothness of gas discharge from the air outlet of the one-way valve to the first exhaust gap.
- the shielding member has a second surface facing the one-way valve, the second surface overlaps the bottom surface of the mounting groove, the second surface is provided with a first groove, and the second exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove.
- the second surface of the shielding member is overlapped on the bottom surface of the mounting groove so that the shielding member is against the bottom surface of the mounting groove, so as to improve the structural stability and reliability of the shielding member installed in the mounting groove.
- a first groove is provided on the second surface so that a second exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove, so that the gas discharged from the outlet of the one-way valve can enter the first exhaust gap through the first groove and then be discharged to the outside of the shell, so that the first exhaust gap and the outlet can be connected through the first groove while the shielding member is against the bottom surface of the mounting groove.
- a plurality of first exhaust gaps are formed between the shielding member and the side surface of the mounting groove, and the plurality of first exhaust gaps are arranged at intervals along the circumference of the shielding member.
- a plurality of first grooves are provided on the second surface, and each first exhaust gap is connected to one of the first grooves.
- a plurality of first exhaust gaps are formed between the shielding member and the groove side surface of the mounting groove, and each first exhaust gap is connected to a first groove, thereby facilitating further improving the exhaust efficiency.
- the second surface is further provided with a second groove, a plurality of the first grooves are arranged around the second groove and are all connected to the second groove, and the second groove is connected to the air outlet.
- a second groove is provided on the second surface of the shielding member facing the one-way valve, the second groove is connected to the air outlet of the one-way valve, and a plurality of first grooves are provided around the second groove and are connected to the second groove, so that the gas discharged from the air outlet of the one-way valve can enter the second groove and then pass through the plurality of first grooves and then respectively pass through the corresponding first exhaust gaps to be discharged to the outside of the outer shell, which is beneficial to improving the exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shielding member and the one-way valve.
- the gas outlet is arranged at an end of the one-way valve away from the electrode assembly, the gas outlet is arranged facing the second groove, and the projection of the gas outlet is located in the second groove.
- the air outlet of the one-way valve and the second groove are arranged to face each other, and the projection of the air outlet in the thickness direction of the wall is located in the second groove, so that the second groove is a structure covering the air outlet in the thickness direction of the wall, so that the gas discharged from the air outlet of the one-way valve can directly enter the second groove, which is beneficial to improving the exhaust smoothness and exhaust efficiency.
- the shielding member does not extend beyond the first surface.
- the shielding member by setting the shielding member not to exceed the first surface of the wall away from the electrode assembly in the thickness direction of the wall, the shielding member can be protected to a certain extent by the installation groove, so as to further reduce the wear of the shielding member.
- the shielding member has a third surface facing away from the one-way valve, and the third surface is flush with the first surface.
- the third surface of the shielding member facing away from the one-way valve and the first surface of the wall portion facing away from the electrode assembly are arranged to be parallel to each other.
- the neat structure is beneficial to further improve the aesthetics of the outer surface of the battery cell, and is convenient for setting information codes or connecting other components such as detection elements on the third surface of the shielding member.
- the one-way valve does not extend beyond the bottom surface of the mounting groove.
- the one-way valve is arranged so as not to exceed the bottom surface of the mounting groove in the thickness direction of the wall, that is, the one-way valve arranged in the mounting hole does not extend into the mounting groove, thereby reducing the interference between the one-way valve and the covering member arranged in the mounting groove and facilitating the exhaust of the one-way valve.
- the shielding member is fixedly connected to the wall portion.
- the shielding member as a structure fixedly connected to the wall portion, it is helpful to reduce the risk of the shielding member detaching from the wall portion during use, and can improve the firmness of the connection between the shielding member and the wall portion, so as to facilitate setting information codes on the shielding member or connecting other components such as detection elements.
- the one-way valve includes a valve body, an elastic member and a blocking member;
- the valve body is arranged on the wall portion, an installation cavity is formed inside the valve body, an air inlet and the air outlet are arranged on the valve body, the air inlet is used to connect the installation cavity with the interior of the outer shell, and the air outlet is used to connect the installation cavity with the exhaust channel;
- the elastic member is arranged in the installation cavity;
- the blocking member is movably arranged in the installation cavity, the blocking member is used to block the air inlet under the action of the elastic member, and is used to open the air inlet under the action of the gas inside the outer shell.
- the one-way valve is provided with a valve body, an elastic member and a sealing member.
- the valve body is arranged on the wall portion, and the valve body is provided with an air inlet connecting the installation cavity and the inside of the shell, and an air outlet connecting the installation cavity and the exhaust channel.
- the elastic member can apply elastic force to the sealing member, so that the sealing member can block the air inlet to prevent the gas outside the shell from entering the inside of the shell, and when the pressure inside the shell rises, the gas inside the shell can act on the sealing member and overcome the elastic force of the elastic member, so that the sealing member can open the air inlet, thereby allowing the gas inside the shell to be discharged after the one-way opening of the one-way valve, so as to realize the one-way exhaust function of the one-way valve.
- the valve body includes a valve body and a valve cover; the valve body is arranged on the wall portion, and the valve body is provided with the air inlet; along the thickness direction of the wall portion, the valve cover is arranged at one end of the valve body away from the electrode assembly, the valve cover and the valve body together enclose the installation cavity, and the valve cover is provided with the air outlet.
- the valve body of the one-way valve includes a valve body and a valve cover.
- the valve cover is connected to the end of the valve body away from the electrode assembly in the thickness direction of the wall so that the valve cover and the valve body jointly define an installation cavity for accommodating the elastic part and the sealing part.
- the one-way valve with this structure is configured with the valve body as two parts, thereby facilitating the assembly of the elastic part and the sealing part into the installation cavity, which helps to reduce the difficulty of assembling the one-way valve.
- the valve cover and the sealing member are spaced apart, two ends of the elastic member are respectively against the valve cover and the sealing member, and the air inlet is arranged on the bottom surface of the installation cavity.
- valve cover and the sealing member are arranged in a structure spaced apart along the thickness direction of the wall, so that the two ends of the elastic member can respectively abut against the valve cover and the sealing member, so that the sealing member can seal the air inlet arranged on the bottom surface of the installation cavity along the thickness direction of the wall under the action of the elastic member. That is to say, the air inlet is arranged at the end of the valve body facing the electrode assembly in the thickness direction of the wall, and the sealing member can move along the thickness direction of the wall and seal the air inlet under the action of the elastic member.
- the one-way valve with this structure makes it easy for the elastic member to apply elastic force to the sealing member so that the sealing member blocks the air inlet, and can reduce the difficulty of assembling the elastic member.
- the installation cavity penetrates one end of the valve body away from the electrode assembly and forms the gas outlet, and the shielding member is arranged facing the gas outlet.
- the installation cavity is set to pass through the end of the valve body away from the electrode assembly in the thickness direction of the wall to form an air outlet at the end of the valve body away from the electrode assembly, and the air outlet is covered by a covering member.
- the one-way valve with this structure facilitates the assembly of the elastic member and the sealing member into the installation cavity through the air inlet, which helps to reduce the difficulty of assembling the one-way valve.
- the shielding member and the blocking member are spaced apart, two ends of the elastic member are respectively against the shielding member and the blocking member, and the air inlet is arranged on the bottom surface of the installation cavity.
- the blocking member and the blocking member are spaced apart in the thickness direction of the wall so that the two ends of the elastic member can respectively abut against the blocking member and the blocking member, so that the blocking member can block the air inlet arranged on the bottom surface of the installation cavity along the thickness direction of the wall under the action of the elastic member. That is to say, the air inlet is arranged at the end of the valve body facing the electrode assembly in the thickness direction of the wall, and the blocking member can move along the thickness direction of the wall and block the air inlet under the action of the elastic member.
- the one-way valve with this structure makes it easy for the elastic member to apply elastic force to the blocking member so that the blocking member blocks the air inlet, and can reduce the difficulty of assembling the elastic member.
- the material of the shielding member is the same as that of the wall portion.
- the shielding member and the wall portion are structures of the same material, on the one hand, it is convenient to assemble the shielding member and the wall portion of the same material to each other, which is beneficial to reduce the difficulty of assembling the shielding member on the wall portion; on the other hand, the appearance of the shielding member and the wall portion can be made the same, which is beneficial to improve the aesthetic appearance of the battery cell.
- the outer shell includes a shell and an end cover; the interior of the shell forms a accommodating cavity with an opening, and the accommodating cavity is used to accommodate the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion; or, the shell includes the wall portion.
- the battery cell with this structure is easy to install the one-way valve and the shielding member on the end cover, which is conducive to reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell.
- the battery cell with this structure can reduce the influence of the stress generated when the end cover and the shell are connected to each other on the one-way valve and the shielding member, so as to alleviate the phenomenon of damage to the one-way valve or failure of the shielding member connection, thereby improving the stability and service life of the battery cell.
- an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.
- an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy.
- FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.
- FIG2 is an exploded view of a battery structure provided in some embodiments of the present application.
- FIG3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application.
- FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application.
- FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application.
- FIG6 is a schematic diagram of the structure of a one-way valve provided in some embodiments of the present application.
- FIG. 7 is a top view of a battery cell provided in some embodiments of the present application.
- FIG8 is a partial enlarged view of the battery cell A shown in FIG7;
- FIG9 is a schematic diagram of the structure of a shielding member provided in some embodiments of the present application.
- FIG10 is a schematic diagram of the structure of shielding members provided in some other embodiments of the present application.
- FIG11 is a schematic structural diagram of shielding members provided in some other embodiments of the present application.
- FIG12 is a bottom view of a shielding member provided in some embodiments of the present application.
- FIG13 is an exploded view of a one-way valve provided in some embodiments of the present application.
- FIG14 is a cross-sectional view of a one-way valve provided in some embodiments of the present application.
- FIG15 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application.
- FIG16 is a partial cross-sectional view of a wall portion of a housing of a battery cell provided in some embodiments of the present application.
- FIG. 17 is a partial cross-sectional view of an insulating member provided in some embodiments of the present application.
- Icon 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-wall; 2111-mounting hole; 2111a-first hole section; 2111b-second hole section; 2112-first surface; 2113-mounting groove; 2113a-second corner surface; 2113b-second side surface; 212-housing; 2121-opening; 213-end cover; 22-electrode assembly; 221-ear; 23-check valve; 231-air outlet; 232-valve body; 2321-mounting cavity; 2322-air inlet; 2323-valve body; 2323a-sinking groove; 2323b-connecting part; 2323c-stress relief groove; 2324-valve cover; 2324a-second A guide column; 233-elastic member; 234-blocking member; 2341-second guide column; 2342-pressing portion; 2342a-clamping groove; 2343-se
- the terms “installed”, “connected”, “connected”, and “attached” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
- installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
- a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
- the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
- the battery cell may be a secondary battery.
- a secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.
- the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.
- a battery cell generally includes an electrode assembly.
- the electrode assembly includes a positive electrode, a negative electrode, and a separator.
- active ions Ions such as lithium ions
- the separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.
- the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.
- the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.
- the positive electrode current collector may be a metal foil or a composite current collector.
- the metal foil aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.
- the composite current collector may include a polymer material base and a metal layer.
- the composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
- the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds.
- the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.
- lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.
- lithium iron phosphate such as LiFePO4 (also referred to as LFP)
- LiMnPO4 lithium manganese phosphate
- lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn2O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1/3 Co 1/3 Mn 1/3 O 2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (also referred to as NCM 811 ), and LiNi 0.8 Co 0.2 Mn 0.2 O 2 (also referred to as NCM 811 ),
- the positive electrode may be a foamed metal.
- the foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam.
- the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided.
- a lithium source material, potassium metal or sodium metal may also be filled or/and deposited in the foamed metal, and the lithium source material is lithium metal and/or a lithium-rich material.
- the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.
- the negative electrode current collector can be a metal foil, a foamed metal or a composite current collector.
- a metal foil aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used.
- the foamed metal can be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon, etc.
- the composite current collector can include a polymer material base and a metal layer.
- the composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
- a metal material copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.
- a polymer material substrate such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.
- the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.
- the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.
- the negative electrode active material may adopt the negative electrode active material for battery cells known in the art.
- the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.
- the silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys.
- the tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys.
- the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.
- the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.
- the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.
- the separator is a separator membrane.
- separator membranes There are many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability can be selected.
- the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.
- the separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different.
- the separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.
- the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.
- the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes.
- the electrolyte can be liquid, gel or solid.
- the liquid electrolyte includes an electrolyte salt and a solvent.
- the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.
- the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone.
- the solvent may also be an ether solvent.
- the ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.
- the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.
- solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.
- the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.
- the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.
- oxide solid electrolyte crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film
- a sulfide solid electrolyte crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide)
- a halide solid electrolyte a nitride solid electrolyt
- the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.
- the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.
- the electrode assembly is a laminate structure.
- a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.
- a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.
- both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.
- a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.
- the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.
- the shape of the electrode assembly can be cylindrical, flat, or polygonal.
- the electrode assembly is provided with tabs, which can lead current out of the electrode assembly.
- the tabs include a positive tab and a negative tab.
- the battery cell may include a housing.
- the housing is used to encapsulate components such as the electrode assembly and the electrolyte.
- the housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.
- the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes.
- the prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.
- the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
- the battery may be a battery module.
- the multiple battery cells are arranged and fixed to form a battery module.
- the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.
- the box body can be used as a part of the chassis structure of the vehicle.
- part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.
- the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.
- Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, battery safety must also be considered. With the rapid development and increasing demand for batteries, the demand for battery life and reliability has also increased.
- a pressure relief mechanism is usually provided on the outer shell of the battery cell to release the internal pressure of the battery cell through the pressure relief mechanism, thereby effectively improving the safety of the battery cell.
- a certain amount of gas is generated during the use of the battery cell, causing the gas pressure in the outer shell of the battery cell to rise, which may cause the pressure relief mechanism of the battery cell to be activated and release pressure in advance during use, resulting in poor stability of the battery cell, which is not conducive to improving the service life and reliability of the battery cell.
- an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly, a one-way valve and a shielding member.
- the shell has a wall portion, the electrode assembly is accommodated in the shell, the one-way valve is arranged on the wall portion, and the one-way valve has an outlet, which is used to discharge the gas inside the shell.
- the shielding member is installed on the wall portion, along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve, and an exhaust channel is formed between the shielding member and the wall portion, and the exhaust channel connects the outlet and the outside of the shell.
- a one-way valve is provided on the wall of the outer shell so that the one-way valve can be opened in one direction and discharge the gas inside the outer shell to the outside of the outer shell. Therefore, when gas is generated inside the outer shell during normal use of the battery cell, it can be discharged to the outside of the outer shell through the one-way valve, so as to alleviate the phenomenon that the internal pressure of the battery cell reaches the threshold value in advance due to the increase of the internal air pressure of the battery cell, thereby causing the battery cell to actuate and release pressure in advance, thereby effectively improving the use stability of the battery cell, thereby improving the service life and reliability of the battery cell.
- the covering member can play a certain protective and shielding role on the one-way valve.
- it can reduce the wear or damage of the one-way valve in the external environment, and can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve, which is beneficial to increasing the service life of the one-way valve.
- covering the one-way valve by the covering member can enhance the aesthetics of the outer surface of the battery cell.
- it is convenient to connect other components such as the detection element on the side of the covering member away from the one-way valve, so as to reduce the interference of the area where the one-way valve is provided on the wall on the connection detection element and other components.
- the battery cells disclosed in the embodiments of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft, and can also be used in energy storage devices.
- a power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the phenomenon of premature valve opening and pressure relief during the use of the battery cells, thereby improving the service life and reliability of the battery cells.
- the embodiment of the present application provides an electric device using a battery as a power source
- the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.
- the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc.
- the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.
- FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
- the vehicle 1000 can be a fuel vehicle, a fuel A gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
- a battery 100 is arranged inside the vehicle 1000, and the battery 100 can be arranged at the bottom, head or tail of the vehicle 1000.
- the battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000.
- the vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.
- the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
- the battery 100 may include a housing 10 and a battery cell 20, wherein the battery cell 20 is used to be accommodated in the housing 10.
- the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures.
- the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.
- the second box body 12 can be a hollow structure with one end open, the first box body 11 can be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; in other embodiments, the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.
- the box body 10 formed by the first box body 11 and the second box body 12 can be in a variety of shapes, such as a cylinder or a cuboid. Exemplarily, in Figure 2, the shape of the box body 10 is a cuboid.
- the battery cell 20 contained in the box 10 may be one or more.
- the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection.
- Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.
- the multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole module composed of the multiple battery cells 20 may be contained in the box 10; of course, in some embodiments, the battery 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then contained in the box 10.
- the battery 100 may further include other structures.
- the battery 100 may further include a busbar component, which is disposed in the housing 10 and connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .
- Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.
- the battery cell 20 may be cylindrical, flat, rectangular or other shapes. For example, in FIG2 , the battery cell 20 is a rectangular structure.
- FIG. 3 is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application
- FIG. 4 is an exploded diagram of the structure of a battery cell 20 provided in some embodiments of the present application
- FIG. 5 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application
- FIG. 6 is a schematic diagram of the structure of a one-way valve 23 provided in some embodiments of the present application.
- the present application provides a battery cell 20, and the battery cell 20 includes a shell 21, an electrode assembly 22, a one-way valve 23 and a shielding member 24.
- the shell 21 has a wall portion 211, and the electrode assembly 22 is accommodated in the shell 21.
- the one-way valve 23 is arranged on the wall portion 211, and the one-way valve 23 has an outlet 231, and the outlet 231 is used to discharge the gas inside the shell 21.
- the shielding member 24 is installed on the wall portion 211. Along the thickness direction X of the wall portion, the shielding member 24 is located on the side of the one-way valve 23 away from the electrode assembly 22, and the shielding member 24 covers the one-way valve 23.
- An exhaust channel 25 is formed between the shielding member 24 and the wall portion 211, and the exhaust channel 25 connects the outlet 231 and the outside of the outer shell 21.
- the housing 21 can also be used to contain electrolyte, such as electrolyte.
- the housing 21 can be in various structural forms, such as a cylinder or a cuboid.
- the housing 21 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.
- the housing 21 may include a shell 212 and an end cap 213, wherein a accommodating cavity is formed inside the shell 212, and the accommodating cavity is used to accommodate the electrode assembly 22, and the accommodating cavity has an opening 2121, that is, the shell 212 is a hollow structure with an opening 2121 at one end, and the end cap 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.
- the wall portion 211 for mounting the one-way valve 23 may be the end cap 213 of the housing 21, or a wall of the shell 212 of the housing 21.
- the wall portion 211 is the end cap 213.
- the structure of the battery cell 20 is not limited thereto, and in other embodiments, the wall portion 211 may also be the bottom wall of the shell 212 and the end cap 213 disposed opposite to each other, or the wall portion 211 may also be the side wall of the shell 212 and the end cap 213 adjacent to and connected to each other.
- the electrode assembly 22 When assembling the battery cell 20 , the electrode assembly 22 may be placed into the shell 212 first, and the shell 212 may be filled with electrolyte. Then, the end cap 213 may be covered on the opening 2121 of the shell 212 to complete the assembly of the battery cell 20 .
- the shell 212 can be in various shapes, such as a cylinder, a cuboid, or a prismatic structure.
- the shape of the shell 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a shell 212 with a cylindrical structure can be selected; if the electrode assembly 22 is a cuboid structure, a shell 212 with a cuboid structure can be selected.
- the structure of the end cap 213 can also be various, for example, the end cap 213 is a plate-like structure or a hollow structure with one end open. Exemplarily, in FIG3, the shell 212 is a cuboid structure.
- the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures.
- the outer shell 21 may include a shell body 212 and two end caps 213.
- the shell body 212 is a hollow structure with openings 2121 on opposite sides.
- One end cap 213 corresponds to an opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the shell body 212 is formed with openings 2121 on opposite sides, and the two end caps 213 are respectively covered on the two sides of the shell body 212 to close the corresponding openings 2121.
- the electrode assembly 22 is the component where electrochemical reactions occur in the battery cell 20, and the structure of the electrode assembly 22 can be of various types.
- the electrode assembly 22 can be a wound structure formed by winding a positive electrode sheet, an isolation member, and a negative electrode sheet, or it can be a stacked structure formed by stacking a positive electrode sheet, an isolation member, and a negative electrode sheet.
- the isolation member is an isolation membrane
- the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.
- the electrode assembly 22 contained in the housing 21 may be one or more.
- the housing 21 of the battery cell 20 is provided with two electrode assemblies 22, and the two electrode assemblies 22 are stacked along the thickness direction thereof, that is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20.
- the electrode assembly 22 contained in the housing 21 may also be one, three, or more. Four, five, six, seven or eight, etc.
- the one-way valve 23 is provided on the wall portion 211, and is used to exhaust the gas inside the housing 21, that is, the one-way valve 23 can be opened in one direction to exhaust gas, so that the gas inside the housing 21 can be discharged to the outside of the housing 21 through the one-way valve 23.
- the one-way valve 23 can be provided on the wall portion 211 in various structures, such as the one-way valve 23 welded to the wall portion 211, the one-way valve 23 clamped to the wall portion 211, or the one-way valve 23 bonded to the wall portion 211.
- the outside of the housing 21 refers to the external environment of the battery cell 20.
- a mounting hole 2111 is provided on the wall portion 211, and the mounting hole 2111 connects the interior of the shell 21 and the exterior of the shell 21, a portion of the one-way valve 23 is assembled into the mounting hole 2111, and extends to the interior of the shell 21 along the thickness direction X of the wall portion, and the one-way valve 23 is sealedly connected to the hole wall surface of the mounting hole 2111.
- the shielding member 24 is mounted on the wall 211, and along the thickness direction X of the wall, the shielding member 24 is located on the side of the one-way valve 23 away from the electrode assembly 22, that is, the shielding member 24 and the one-way valve 23 are arranged along the thickness direction X of the wall, and the shielding member 24 is farther away from the electrode assembly 22 than the one-way valve 23.
- the shielding member 24 can be mounted on the wall 211 in various structures, for example, the shielding member 24 can be mounted on the wall 211 by welding, interference fit, bolting, clamping or bonding.
- the shielding member 24 covers the one-way valve 23 , that is, the projection of the one-way valve 23 in the thickness direction X of the wall is located inside the shielding member 24 .
- An exhaust channel 25 is formed between the shielding member 24 and the wall portion 211, and the exhaust channel 25 connects the air outlet 231 and the outside of the outer shell 21. That is, the shielding member 24 and the wall portion 211 jointly define the exhaust channel 25 connecting the air outlet 231 of the one-way valve 23 and the outside of the outer shell 21, so that the gas discharged from the inside of the outer shell 21 through the air outlet 231 by the one-way valve 23 can enter the exhaust channel 25 and then be discharged to the outside of the outer shell 21.
- the material of the shielding member 24 may be copper, iron, aluminum, steel or aluminum alloy.
- the battery cell 20 may further include an electrode terminal 26 , which is insulated and mounted on the housing 21 , and is electrically connected to the electrode assembly 22 to output or input electrical energy of the battery cell 20 .
- the electrode terminal 26 is insulated and mounted on the housing 21 , that is, no electrical connection is formed between the electrode terminal 26 and the housing 21 .
- the battery cell 20 includes two electrode terminals 26.
- each electrode assembly 22 has two pole ears 221, and the polarities of the two pole ears 221 are opposite.
- the two electrode terminals 26 are electrically connected to the two pole ears 221 of the electrode assembly 22, respectively, so as to realize the input or output of the positive electrode and the negative electrode of the battery cell 20.
- the pole ears 221 of the electrode assembly 22 are components formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer, or components formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.
- pole ears 221 are used to output the positive electrode of the electrode assembly 22, the pole ears 221 are components formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the pole ears 221 are used to output the negative electrode of the electrode assembly 22, the pole ears 221 are components formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.
- the electrode terminal 26 may be made of a variety of materials.
- the electrode terminal 26 may be made of copper, iron, aluminum, steel, or aluminum alloy.
- the electrode terminals 26 may be installed on the housing 21 in various structures. For example, in FIG3 , both electrode terminals 26 are installed on the end cap 213 of the housing 21. Of course, the structure of the battery cell 20 is not limited thereto. In other embodiments, both electrode terminals 26 may be installed on the housing 212 of the housing 21. Similarly, one electrode terminal 26 may be installed on the housing 212 of the housing 21, and the other electrode terminal 26 may be installed on the end cap 213 of the housing 21.
- the battery cell 20 may further include a pressure relief mechanism 27, which is mounted on the housing 21.
- the pressure relief mechanism 27 may be disposed on the end cover 213 of the housing 21, or may be disposed on the shell 212 of the housing 21, and the pressure relief mechanism 27 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.
- the pressure relief mechanism 27 is disposed on the end cover 213 of the housing 21 , and the pressure relief mechanism 27 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.
- the one-way valve 23 can be opened in one direction and discharge the gas inside the outer shell 21 to the outside of the outer shell 21, so that when gas is generated inside the outer shell 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer shell 21 through the one-way valve 23, so as to alleviate the phenomenon that the internal pressure of the battery cell 20 reaches the threshold value in advance due to the increase of the internal air pressure of the battery cell 20, so as to cause the battery cell 20 to actuate and release pressure in advance, thereby effectively improving the use stability of the battery cell 20, so as to improve the service life and use reliability of the battery cell 20.
- the shielding member 24 can play a certain protective and shielding role on the one-way valve 23. On the one hand, it can reduce the wear or damage of the one-way valve 23 in the external environment, and can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve 23, which is beneficial to improving the service life of the one-way valve 23. On the other hand, covering the one-way valve 23 by the shielding member 24 can enhance the aesthetics of the outer surface of the battery cell 20.
- the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22, the first surface 2112 is provided with a mounting groove 2113, the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111, at least a portion of the one-way valve 23 is disposed in the mounting hole 2111, and at least a portion of the shielding member 24 is accommodated in the mounting groove 2113.
- the first surface 2112 is provided with a mounting groove 2113 , and the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111 , that is, the mounting hole 2111 passes through the bottom surface of the mounting groove 2113 , so that the mounting hole 2111 is connected to the outside of the shell 21 through the mounting groove 2113 .
- the shielding member 24 is accommodated in the mounting groove 2113 , that is, the shielding member 24 may be entirely located in the mounting groove 2113 , or only partially located in the mounting groove 2113 .
- the shielding member 24 is entirely located in the mounting groove 2113 .
- the installation groove 2113 By providing an installation groove 2113 on the first surface 2112 of the wall portion 211 away from the electrode assembly 22, and at least partially accommodating the shielding member 24 in the installation groove 2113, on the one hand, the space occupied by the shielding member 24 and the wall portion 211 in the thickness direction X of the wall portion can be reduced, which is beneficial to optimizing the volume of the battery cell 20.
- the installation groove 2113 can play a certain positioning and limiting role for the shielding member 24, which is beneficial to reducing the difficulty of assembling the shielding member 24 connected to the wall portion 211.
- FIG. 7 is a top view of a battery cell 20 provided in some embodiments of the present application
- FIG. 8 is a partial enlarged view of the battery cell 20 at A shown in FIG. 7.
- the exhaust channel 25 may include a first exhaust gap 251, which is formed between the shielding member 24 and the groove side of the mounting groove 2113, and the first exhaust gap 251 is used to connect the gas outlet 231 and the outside of the housing 21.
- the first exhaust gap 251 plays a role in connecting the air outlet 231 and the outside of the shell 21.
- the first exhaust gap 251 can be directly connected to the air outlet 231.
- at least part of the projection of the first exhaust gap 251 in the thickness direction X of the wall is located in the mounting hole 2111, so that the air outlet 231 of the one-way valve 23 arranged in the mounting hole 2111 can be directly connected to the first exhaust gap 251.
- the first exhaust gap 251 can also be indirectly connected to the air outlet 231.
- the exhaust channel 25 can also include a second exhaust gap 252, and the second exhaust gap 252 is formed between the shielding member 24 and the bottom surface of the mounting groove 2113.
- the second exhaust gap 252 connects the first exhaust gap 251 and the air outlet 231 of the one-way valve 23.
- the gas exhausted by the one-way valve 23 can be discharged to the outside of the outer shell 21 through the first exhaust gap 251.
- the battery cell 20 using this structure does not need to have a channel opened on the covering member 24, which is beneficial to reduce the processing difficulty and can improve the appearance of the battery cell 20.
- the structure of the first exhaust gap 251 formed between the shielding member 24 and the groove side of the mounting groove 2113 can be various. According to some embodiments of the present application, please refer to Figures 7 and 8, and please further refer to Figure 9, which is a schematic diagram of the structure of the shielding member 24 provided in some embodiments of the present application.
- the outer peripheral surface of the shielding member 24 includes a first corner surface 241 and at least two first side surfaces 242, and the first corner surface 241 connects two adjacent first side surfaces 242.
- the groove side surface of the mounting groove 2113 includes a second corner surface 2113a and at least two second side surfaces 2113b, and the second corner surface 2113a connects two adjacent second side surfaces 2113b. Each second side surface 2113b is connected to a first side surface 242, and a first exhaust gap 251 is formed between the second corner surface 2113a and the first corner surface 241.
- the first corner surface 241 connects two adjacent first side surfaces 242, that is, in the circumferential direction of the shielding member 24, the first corner surface 241 is located between the two first side surfaces 242 and connects the two first side surfaces 242, that is, the first corner surface 241 is the surface at the corner of the outer peripheral surface of the shielding member 24.
- the second corner surface 2113a connects two adjacent second side surfaces 2113b, that is, in the circumferential direction of the mounting groove 2113, the second corner surface 2113a is located between the two second side surfaces 2113b and connects the two second side surfaces 2113b, that is, the second corner surface 2113a is the surface at the corner of the groove side surface of the mounting groove 2113.
- Each first side surface 242 of the shielding member 24 abuts against and is connected to the corresponding second side surface 2113b of the groove side surface of the mounting groove 2113, so that the first corner surface 241 of the shielding member 24 is facing the second corner surface 2113a of the groove side surface of the mounting groove 2113, so that a first exhaust gap 251 is formed between the first corner surface 241 and the second corner surface 2113a.
- connection structure between the first side surface 242 and the second side surface 2113b can be various, such as welding, bonding or interference fit.
- the shielding member 24 and the mounting groove 2113 are both rectangular structures, so that four first corner surfaces 241 are correspondingly formed at the four corners of the shielding member 24, and correspondingly, four second corner surfaces 2113a are correspondingly formed at the four corners of the groove side of the mounting groove 2113, so that four first exhaust gaps 251 are formed between the shielding member 24 and the groove side of the mounting groove 2113.
- first corner surface 241 Two adjacent first side surfaces 242 in the outer peripheral surface of the shielding member 24 are connected by a first corner surface 241, and two connected second side surfaces 2113b in the groove side surfaces of the mounting groove 2113 are connected by a second corner surface 2113a.
- Each first side surface 242 is connected to a second side surface 2113b, and a first gap is formed between the first corner surface 241 and the second corner surface 2113a.
- a first exhaust gap 251 is formed at the corner of the shielding member 24 and the mounting groove 2113.
- the structure is simple and easy to implement.
- the first corner surface 241 and the second corner surface 2113 a are both arc surfaces, and the radius of the first corner surface 241 is greater than the radius of the second corner surface 2113 a .
- the first corner surface 241 and the second corner surface 2113a are both arc surfaces, that is, the first corner surface 241 is a surface formed at the rounded corner of the outer peripheral surface of the shielding member 24, and similarly, the second corner surface 2113a is a surface formed at the rounded corner of the groove side surface of the installation groove 2113.
- the first corner surface 241 can also be a surface formed at the chamfer of the outer peripheral surface of the shielding member 24, and the second corner surface 2113a can also be a surface formed at the chamfer of the groove side surface of the installation groove 2113.
- the radius of the first corner surface 241 is greater than the radius of the second corner surface 2113 a , that is, the diameter of the rounded corner of the outer peripheral surface of the shielding member 24 is greater than the diameter of the rounded corner of the groove side surface of the installation groove 2113 .
- first corner surface 241 and the second corner surface 2113a By setting the first corner surface 241 and the second corner surface 2113a to be arc surfaces, and the radius of the first corner surface 241 is greater than the radius of the second corner surface 2113a, a first exhaust gap 251 is formed between the first corner surface 241 and the second corner surface 2113a, which has a simple structure and is easy to manufacture and process.
- the first side surface 242 is connected to the second side surface 2113b by welding.
- first side surface 242 and the second side surface 2113b are mutually welded structure, it is helpful to improve the connection firmness between the shielding member 24 and the groove side surface of the installation groove 2113, so as to improve the structural stability of the shielding member 24 assembled to the wall portion 211.
- the cross-section of the shielding member 24 in the thickness direction X perpendicular to the wall portion is rectangular, and the outer peripheral surface of the shielding member 24 includes four first side surfaces 242 and four first corner surfaces 241, and a first exhaust gap 251 is formed at at least one first corner surface 241.
- the cross section of the shielding member 24 in the thickness direction X perpendicular to the wall is rectangular, that is, the shielding member 24 is a rectangular structure.
- the shape of the mounting groove 2113 matches the shielding member 24, and the mounting groove 2113 is also a rectangular structure.
- a first exhaust gap 251 is formed at at least one first corner surface 241, that is, among the four first corner surfaces 241 of the shielding member 24, only one first corner surface 241 may have a first exhaust gap 251 formed thereon, or two, three or four first corner surfaces 241 may have a first exhaust gap 251 formed thereon.
- the cross-section of the shielding member 24 in the direction X perpendicular to the thickness of the wall portion may also be a triangle, a pentagon, a hexagon, a trapezoid, or the like.
- the shielding member 24 By configuring the shielding member 24 as a rectangular plate structure, the four sides of the shielding member 24 form four first side surfaces 242 , and four first corner surfaces 241 are formed at four right angles of the shielding member 24 , which has a simple structure and is easy to manufacture.
- the first exhaust gap 251 formed between the shielding member 24 and the groove side of the installation groove 2113 can also be other structures, for example, refer to Figure 10, which is a schematic diagram of the structure of the shielding member 24 provided in some other embodiments of the present application.
- the outer peripheral surface of the shielding member 24 is provided with a groove 243, and the first exhaust gap 251 is formed between the groove bottom surface of the groove 243 and the groove side of the installation groove 2113.
- the outer circumferential surface of the shielding member 24 is used to be connected to the groove side surface of the installation groove 2113, so that the shielding member 24 is installed in the installation groove 2113.
- a notch is formed in the shielding member 24 at the position where the groove 243 is provided, so that the shielding member 24 at the position where the groove 243 is provided and the groove side surface of the installation groove 2113 jointly define the first exhaust gap 251.
- connection structure between the outer peripheral surface of the shielding member 24 and the groove side surface of the installation groove 2113 can be various, such as welding or bonding.
- the number of the grooves 243 provided on the outer circumferential surface of the shielding member 24 may be one or more.
- the plurality of grooves 243 are arranged at intervals along the circumferential direction of the shielding member 24 .
- the shielding member 24 is a rectangular structure, and grooves 243 are provided on two of the four straight sides of the shielding member 24.
- the number of grooves 243 provided on the outer peripheral surface of the shielding member 24 may also be three, four, or five, etc.
- the shape of the shielding member 24 may also be a triangle, a trapezoid, a circle, etc.
- a first exhaust gap 251 for exhaust is formed between the groove bottom surface of the groove 243 and the groove side surface of the mounting groove 2113 , which has a simple structure and is easy to manufacture.
- the area of the outer circumferential surface of the shielding member 24 where the groove 243 is not provided is welded and connected to the groove side surface of the installation groove 2113 .
- the shielding member 24 is connected to the groove side of the installation groove 2113.
- the battery cell 20 adopting this structure is beneficial to the connection firmness between the shielding member 24 and the wall portion 211, so as to improve the structural stability of the shielding member 24 assembled on the wall portion 211.
- the first exhaust gap 251 formed between the shielding member 24 and the groove side of the installation groove 2113 can also be other structures, for example, refer to Figure 11, which is a schematic diagram of the structure of the shielding member 24 provided in some embodiments of the present application.
- the outer peripheral surface of the shielding member 24 is convexly provided with a plurality of convex portions 244, and the plurality of convex portions 244 are arranged at intervals along the circumference of the shielding member 24, and the convex portions 244 abut against the groove side of the installation groove 2113, and the first exhaust gap 251 is formed between the area of the outer peripheral surface of the shielding member 24 where the convex portions 244 are not provided and the groove side of the installation groove 2113.
- the protrusion 244 abuts against the groove side of the installation groove 2113 to form a cavity between two adjacent protrusions 244, so that the outer peripheral surface of the shielding member 24, the groove side of the installation groove 2113 and the two adjacent protrusions 244 jointly define a first exhaust gap 251.
- the shielding member 24 can be assembled in various structures in the installation groove 2113.
- the shielding member 24 can be assembled in the installation groove 2113 by interference fit between the abutment portion and the groove side of the installation groove 2113, welding or bonding, etc.
- the outer peripheral surface of the shielding member 24 is provided with a plurality of protrusions 244 arranged at intervals along the circumference of the shielding member 24, and the protrusions 244 abut against the groove side of the mounting groove 2113, so that a first exhaust gap 251 for exhaust is formed between the area of the outer peripheral surface of the shielding member 24 where the protrusions 244 are not provided and the groove side of the mounting groove 2113. That is to say, the first exhaust gap 251 is located between two adjacent protrusions 244, and the structure is simple and easy to assemble.
- the protrusion 244 is interference fit with the groove side of the installation groove 2113.
- the shielding member 24 is fixed in the mounting groove 2113 by interference fit of the protrusion 244 protruding from the outer peripheral surface of the shielding member 24 with the groove side surface of the mounting groove 2113.
- the battery cell 20 adopting this structure can form a first exhaust gap 251 between two adjacent protrusions 244 while facilitating the installation of the shielding member 24 on the wall portion 211, which helps to reduce the difficulty of assembling the shielding member 24.
- the first exhaust gap 251 can also be other structures.
- a breathable groove can be set on the side of the installation groove 2113 to form the first exhaust gap 251 between the bottom surface of the breathable groove and the outer peripheral surface of the shielding member 24.
- FIG. 12 is a bottom view of the shielding member 24 provided in some embodiments of the present application.
- the exhaust channel 25 may further include a second exhaust gap 252, the second exhaust gap 252 is formed between the shielding member 24 and the bottom surface of the groove of the mounting groove 2113, and the second exhaust gap 252 communicates with the first exhaust gap 251 and the air outlet 231.
- the second exhaust gap 252 is formed between the shielding member 24 and the bottom surface of the mounting groove 2113.
- the shielding member 24 and the bottom surface of the mounting groove 2113 can be arranged at intervals along the thickness direction X of the wall portion, so that the second exhaust gap 252 is formed between the surface of the shielding member 24 facing the bottom surface of the mounting groove 2113 and the bottom surface of the mounting groove 2113.
- the first groove 2451 is provided on the surface of the shielding member 24 facing the bottom surface of the mounting groove 2113, so that the second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113.
- a first groove 2451 may be provided on the bottom surface of the mounting groove 2113 to form a second exhaust gap 252 between the bottom surface of the first groove 2451 and the surface of the shielding member 24 facing the bottom surface of the mounting groove 2113 .
- the exhaust channel 25 also includes a second exhaust gap 252 formed between the covering member 24 and the bottom surface of the mounting groove 2113, and the second exhaust gap 252 connects the first exhaust gap 251 and the gas outlet 231 to alleviate the exhaust obstruction between the gas outlet 231 and the first exhaust gap 251 caused by the covering member 24 abutting against the bottom surface of the mounting groove 2113, thereby improving the smoothness of gas discharge from the gas outlet 231 of the one-way valve 23 to the first exhaust gap 251.
- the shielding member 24 has a second surface 245 facing the one-way valve 23, and the second surface 245 overlaps the bottom surface of the mounting groove 2113.
- the second surface 245 is provided with a first groove 2451, and a second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113.
- the second surface 245 overlaps the bottom surface of the installation groove 2113, that is, part of the second surface 245 abuts against the bottom surface of the installation groove 2113, that is, along the thickness direction X of the wall, the shielding member 24 abuts against the bottom surface of the installation groove 2113.
- a second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113 , that is, the bottom surface of the first groove 2451 , the groove side surface of the first groove 2451 and the bottom surface of the mounting groove 2113 jointly define the second exhaust gap 252 .
- the shielding member 24 is made to abut against the bottom surface of the mounting groove 2113, so as to improve the structural stability and reliability of the shielding member 24 installed in the mounting groove 2113.
- a second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113, so that the gas discharged from the outlet 231 of the one-way valve 23 can enter the first exhaust gap 251 through the first groove 2451 and then be discharged to the outside of the shell 21, so that the shielding member 24 can abut against the bottom surface of the mounting groove 2113 and at the same time, the first exhaust gap 251 can be connected with the outlet 231 through the first groove 2451.
- a plurality of first exhaust gaps 251 are formed between the shielding member 24 and the groove side surface of the mounting groove 2113, and the plurality of first exhaust gaps 251 are arranged at intervals along the circumference of the shielding member 24, and a plurality of first grooves 2451 are provided on the second surface 245, and each first exhaust gap 251 is connected to a first groove 2451.
- the first groove 2451 extends in the radial direction of the shielding member 24, and the first groove 2451 penetrates the first corner surface 241, so that the second exhaust gap 252 formed between the groove bottom surface of the first groove 2451 and the groove bottom surface of the mounting groove 2113 can be communicated with the first exhaust gap 251 formed between the first corner surface 241 and the second corner surface 2113a.
- the first groove 2451 penetrates the groove bottom surface of the groove 243.
- the first groove 2451 penetrates the area where the convex portion 244 is not provided on the outer peripheral surface of the shielding member 24.
- the shielding member 24 has four first corner surfaces 241 , and a first exhaust gap 251 is formed at each first corner surface 241 .
- four first grooves 2451 are provided on the second surface 245 of the shielding member 24 , and each first groove 2451 passes through a first corner surface 241 .
- a plurality of first exhaust gaps 251 are formed between the shielding member 24 and the groove side surface of the mounting groove 2113 , and each first exhaust gap 251 is connected to a first groove 2451 , thereby facilitating further improving the exhaust efficiency.
- the second surface 245 is further provided with a second groove 2452 , a plurality of first grooves 2451 are arranged around the second groove 2452 and are all connected to the second groove 2452 , and the second groove 2452 is connected to the air outlet 231 .
- first grooves 2451 are provided on the second surface 245 of the shielding member 24, and the four first grooves 2451 are arranged at intervals along the circumference of the second groove 2452.
- the first grooves 2451 extend along the radial direction of the shielding member 24 and penetrate the groove side faces of the second grooves 2452, so that the first grooves 2451 can be connected with the air outlet 231 through the second grooves 2452, thereby enabling the second exhaust gap 252 to be connected with the air outlet 231 through the second grooves 2452.
- the second groove 2452 is connected to the air outlet 231 of the one-way valve 23, and a plurality of first grooves 2451 are set around the second groove 2452 and are all connected to the second groove 2452, so that the gas discharged from the air outlet 231 of the one-way valve 23 can enter the second groove 2452 and then pass through the plurality of first grooves 2451 and then pass through the corresponding first exhaust gaps 251 to be discharged to the outside of the shell 21, which is beneficial to improving the exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shielding member 24 and the one-way valve 23.
- the gas outlet 231 is arranged at the end of the one-way valve 23 away from the electrode assembly 22, the gas outlet 231 is arranged facing the second groove 2452, and the projection of the gas outlet 231 is located in the second groove 2452.
- the projection of the one-way valve 23 in the thickness direction X of the wall is entirely located in the second groove 2452 .
- the second groove 2452 is a structure covering the air outlet 231 in the thickness direction X of the wall, so that the gas discharged from the air outlet 231 of the one-way valve 23 can directly enter the second groove 2452, which is beneficial to improving the exhaust smoothness and exhaust efficiency.
- the shielding member 24 does not extend beyond the first surface 2112 .
- the shielding member 24 does not extend beyond the first surface 2112 , that is, the shielding member 24 does not extend out of the installation groove 2113 in the thickness direction X of the wall portion, so that the entire shielding member 24 is located in the installation groove 2113 .
- the shielding member 24 By setting the shielding member 24 so as not to extend beyond the first surface 2112 of the wall 211 away from the electrode assembly 22 in the thickness direction X of the wall, the shielding member 24 can be protected to a certain extent by the installation groove 2113, thereby further reducing the wear of the shielding member 24.
- the shielding member 24 has a third surface 246 facing away from the one-way valve 23 , and the third surface 246 is flush with the first surface 2112 .
- the third surface 246 of the shielding member 24 away from the one-way valve 23 and the first surface 2112 of the wall portion 211 away from the electrode assembly 22 is beneficial to further improve the aesthetics of the outer surface of the battery cell 20, and it is convenient to set information codes or connect other components such as detection elements on the third surface 246 of the shielding member 24.
- the information code can be a QR code, a barcode, numbers or text
- the information of the battery cell 20 can be obtained by scanning or manually inputting the information code.
- the detection element can include a circuit board and a sampling terminal electrically connected to the circuit board, and the sampling terminal includes a metal sheet (such as a nickel sheet), a temperature sensor, etc.
- the one-way valve 23 does not extend beyond the bottom surface of the installation groove 2113 .
- the one-way valve 23 does not extend beyond the bottom surface of the mounting groove 2113 , that is, the one-way valve 23 is disposed in the mounting hole 2111 and does not extend into the mounting groove 2113 in the thickness direction X of the wall.
- the end surface of the one-way valve 23 facing away from the electrode assembly 22 in the thickness direction X of the wall is flush with the bottom surface of the mounting groove 2113, and the projection of the one-way valve 23 in the thickness direction X of the wall is located in the second groove 2452, so that the one-way valve 23 and the bottom surface of the second groove 2452 are structures arranged at intervals along the thickness direction X of the wall, and the end of the one-way valve 23 facing the electrode assembly 22 in the thickness direction X of the wall protrudes from the surface of the wall 211 facing the electrode assembly 22, so that part of the one-way valve 23 extends into the outer shell 21.
- the one-way valve 23 By setting the one-way valve 23 so as not to extend beyond the bottom surface of the mounting groove 2113 in the thickness direction X of the wall, that is, the one-way valve 23 arranged in the mounting hole 2111 does not extend into the mounting groove 2113, the interference between the one-way valve 23 and the covering member 24 arranged in the mounting groove 2113 can be reduced, and the one-way valve 23 is facilitated to exhaust.
- the shielding member 24 is fixedly connected to the wall portion 211 .
- the shielding member 24 and the wall portion 211 may be fixedly connected in various structures.
- the shielding member 24 may be connected to the wall portion 211 by welding, bonding or interference fit.
- the shielding member 24 By setting the shielding member 24 as a structure fixedly connected to the wall portion 211, the risk of the shielding member 24 detaching from the wall portion 211 during use can be reduced, and the firmness of the connection between the shielding member 24 and the wall portion 211 can be improved, so as to facilitate setting information codes on the shielding member 24 or connecting other components such as detection elements.
- FIG. 13 is a structural exploded view of a one-way valve 23 provided in some embodiments of the present application
- FIG. 14 is a cross-sectional view of a one-way valve 23 provided in some embodiments of the present application.
- the one-way valve 23 may include a valve body 232, an elastic member 233, and a blocking member 234.
- the valve body 232 is disposed on the wall portion 211, and an installation cavity 2321 is formed inside the valve body 232.
- An air inlet 2322 and an air outlet 231 are disposed on the valve body 232.
- the air inlet 2322 is used to connect the installation cavity 2321 with the interior of the housing 21, and the air outlet 231 is used to connect the installation cavity 2321 with the exhaust channel 25.
- the elastic member 233 is disposed in the installation cavity 2321.
- the blocking member 234 is movably disposed in the installation cavity 2321 .
- the blocking member 234 is used to block the air inlet 2322 under the action of the elastic member 233 , and is used to open the air inlet 2322 under the action of the gas inside the housing 21 .
- the air inlet 2322 is used to connect the installation cavity 2321 and the interior of the outer shell 21, that is, the gas inside the outer shell 21 can enter the installation cavity 2321 through the air inlet 2322.
- the air outlet 231 is used to connect the installation cavity 2321 and the exhaust channel 25, that is, the gas from the inside of the outer shell 21 that enters the installation cavity 2321 can enter the exhaust channel 25 through the air outlet 231, and then be discharged to the outside of the outer shell 21 through the exhaust channel 25.
- the blocking piece 234 is movably disposed in the installation cavity 2321, that is, the blocking piece 234 can move in the installation cavity 2321, so that the blocking piece 234 can block the air inlet 2322 when it moves closer to the air inlet 2322, and conversely, the air inlet 2322 can be opened when the blocking piece 234 moves away from the air inlet 2322.
- the sealing member 234 is used to seal the air inlet 2322 under the action of the elastic member 233, and is used to open the air inlet 2322 under the action of the gas inside the shell 21. That is to say, the elastic member 233 can provide elastic force for the sealing member 234, so that the sealing member 234 can abut against the bottom surface of the installation cavity 2321 to seal the air inlet 2322.
- the gas inside the shell 21 can overcome the elastic force of the elastic member 233 and push the sealing member 234 to separate from the bottom surface of the installation cavity 2321, so as to realize the sealing member 234 opening the air inlet 2322, so that the gas inside the shell 21 can enter the installation cavity 2321 through the air inlet 2322 and then be discharged through the air outlet 231.
- the elastic member 233 is an elastic member, and its structure can be various, such as a spring, a spring or elastic rubber, etc.
- the elastic member 233 is a spring.
- the elastic member 233 and the blocking member 234 can also be an elastic member as a whole, such as elastic rubber, etc.
- the projection of the air outlet 231 in the thickness direction X of the wall may be located inside the spring or outside the spring.
- the projections of the multiple air outlets 231 in the thickness direction X of the wall may be located inside the spring or around the outside of the spring. Of course, in some embodiments, they may be partially located inside the spring and partially located outside the spring.
- the one-way valve 23 is provided with a valve body 232, an elastic member 233 and a blocking member 234.
- the valve body 232 is provided on the wall portion 211.
- the valve body 232 is provided with an air inlet 2322 communicating with the installation cavity 2321 and the inside of the housing 21, and an air outlet 231 connecting the installation cavity 2321 and the exhaust passage 25.
- the elastic member 233 can apply an elastic force to the blocking member 234, so that The blocking member 234 can block the air inlet 2322 to prevent the gas outside the shell 21 from entering the interior of the shell 21, and when the pressure inside the shell 21 rises, the gas inside the shell 21 can act on the blocking member 234 and overcome the elastic force of the elastic member 233, so that the blocking member 234 can open the air inlet 2322, so that the gas inside the shell 21 can be discharged after being opened unidirectionally by the one-way valve 23, so as to realize the one-way exhaust function of the one-way valve 23.
- the valve body 232 may include a valve body 2323 and a valve cover 2324.
- the valve body 2323 is disposed on the wall portion 211, and the valve body 2323 is provided with an air inlet 2322.
- the valve cover 2324 is disposed at one end of the valve body 2323 away from the electrode assembly 22, and the valve cover 2324 and the valve body 2323 are enclosed together to form an installation cavity 2321, and the valve cover 2324 is provided with an air outlet 231.
- a mounting hole 2111 is provided on the wall portion 211, and the valve body 2323 is installed in the mounting hole 2111, and the valve body 2323 extends into the outer shell 21 along the thickness direction X of the wall portion, that is, the valve body 2323 protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion.
- the valve body 2323 may be installed on the wall portion 211 in various structures.
- the valve body 2323 may be welded to the wall surface of the mounting hole 2111 or may be bonded to the wall surface of the mounting hole 2111 by a sealant.
- the air inlet 2322 is disposed at one end of the valve body 2323 in the thickness direction X of the wall portion close to the electrode assembly 22, that is, the air inlet 2322 passes through the bottom surface of the installation cavity 2321, and correspondingly, the blocking member 234 is movably disposed in the installation cavity 2321 along the thickness direction X of the wall portion, so that the blocking member 234 can block the air inlet 2322 when it abuts against the bottom surface of the installation cavity 2321.
- the air inlet 2322 can also be disposed on one side of the valve body 2323 in the radial direction of the valve body 2323, and correspondingly, the blocking member 234 is movably disposed in the installation cavity 2321 along the radial direction of the valve body 2323.
- the air outlet 231 is a first through hole provided on the valve cover 2324, and the first through hole penetrates both sides of the valve cover 2324 along the thickness direction X of the wall.
- three air outlets 231 are provided on the valve cover 2324, and the three air outlets 231 are provided around the central axis of the mounting hole 2111.
- the number of air outlets 231 provided on the valve cover 2324 may also be one, two, four, or five.
- the multiple air outlets 231 there are multiple air outlets 231 disposed on the valve cover 2324 , and the multiple air outlets 231 are arranged at equal intervals.
- a plurality of gas outlets 231 are arranged at equal intervals around the center of the valve cover 2324, which can make the gas flow out more smoothly.
- valve cover 2324 is connected to the valve body 2323, and a sink 2323a is provided at one end of the valve body 2323 away from the electrode assembly 22, and at least a portion of the valve cover 2324 is accommodated in the sink 2323a.
- the one-way valve 23 with such a structure can save the space occupied by the valve body 232 in the thickness direction X of the wall, and can improve the structural stability of the valve cover 2324 assembled on the valve body 2323, and can play a certain protective role on the valve cover 2324, so as to reduce the phenomenon of wear or damage of the valve cover 2324.
- the installation cavity 2321 penetrates the bottom surface of the groove 2323a, and the valve cover 2324 is assembled in the groove 2323a and is aligned with the bottom surface of the groove 2323a.
- the valve cover 2324 and the valve body 2323 are abutted to form a mounting cavity 2321 .
- valve cover 2324 At least part of the valve cover 2324 is accommodated in the groove 2323a, that is, the valve cover 2324 may be located in the groove 2323a as a whole or partially. In other words, in the thickness direction X of the wall, the valve cover 2324 may extend out of the groove 2323a or may not extend out of the groove 2323a. For example, in FIG. 14 , the valve cover 2324 is located in the groove 2323a as a whole.
- the material of the valve body 2323 can be a metal material, such as copper, iron, aluminum, steel or aluminum alloy, etc.
- the material of the valve cover 2324 can also be a metal material, such as copper, iron, aluminum, steel or aluminum alloy, etc.
- the valve body 2323 and the valve cover 2324 can be the same material or different materials.
- the valve body 232 of the one-way valve 23 includes a valve main body 2323 and a valve cover 2324.
- the valve cover 2324 is connected to the end of the valve main body 2323 that is away from the electrode assembly 22 in the thickness direction X of the wall, so that the valve cover 2324 and the valve main body 2323 jointly define an installation cavity 2321 for accommodating the elastic member 233 and the sealing member 234.
- the one-way valve 23 with this structure is configured with the valve body 232 as two parts, thereby facilitating the assembly of the elastic member 233 and the sealing member 234 into the installation cavity 2321, which helps to reduce the difficulty of assembling the one-way valve 23.
- the valve cover 2324 and the blocking member 234 are spaced apart from each other, the two ends of the elastic member 233 respectively abut against the valve cover 2324 and the blocking member 234 , and the air inlet 2322 is arranged on the bottom surface of the installation cavity 2321 .
- the valve cover 2324 is arranged to face the bottom surface of the installation cavity 2321, and the two ends of the elastic member 233 in the thickness direction X of the wall portion are respectively abutted against the valve cover 2324 and the sealing member 234, so that the elastic member 233 is compressed between the valve cover 2324 and the sealing member 234, so that the elastic member 233 can provide elastic force for the sealing member 234, so that the sealing member 234 can block the air inlet 2322 arranged on the bottom surface of the installation cavity 2321 under the action of the elastic force of the elastic member 233.
- a first guide column 2324 a is protruded from one side of the valve cover 2324 facing the blocking member 234 , and a portion of the elastic member 233 is sleeved on the outer side of the first guide column 2324 a .
- the one-way valve 23 with such a structure can, on the one hand, play a certain positioning role for the elastic member 233 through the first guide column 2324a, so as to facilitate the assembly of the elastic member 233, which is beneficial to reduce the difficulty of assembling the elastic member 233;
- the first guide column 2324a can play a certain guiding role when the elastic member 233 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 233 during the compression process, so that the elastic member 233 can be stably compressed along the thickness direction X of the wall, which is beneficial to improve the reliability of the elastic member 233, and further reduce the risk of the sealing member 234 accidentally opening the air inlet 2322.
- the elastic member 233 is a spring, part of which is sleeved on the outside of the first guide column 2324a, and one end of the spring away from the blocking member 234 abuts against the surface of the valve cover 2324 where the first guide column 2324a is protruding, that is, the first guide column 2324a is inserted into the spring.
- the central axis of the first guide column 2324a coincides with the central axis of the mounting hole 2111
- the central axis of the elastic member 233 coincides with the central axis of the first guide column 2324a .
- the multiple air outlets 231 surround the outer side of the first guide column 2324a.
- the air outlet 231 can also be a structure that penetrates the first guide column 2324a along the thickness direction X of the wall.
- the two ends of the elastic member 233 can respectively abut against the valve cover 2324 and the blocking member 234, so that the blocking member 234 can block the air inlet 2322 arranged on the bottom surface of the installation cavity 2321 along the thickness direction X of the wall under the action of the elastic member 233. That is to say, the air inlet 2322 is arranged at one end of the valve body 2323 facing the electrode assembly 22 in the thickness direction X of the wall, and the blocking member 234 can move along the thickness direction X of the wall and block the air inlet 2322 under the action of the elastic member 233.
- the one-way valve 23 adopting this structure makes it easy for the elastic member 233 to apply elastic force to the blocking member 234, so that the blocking member 234 blocks the air inlet 2322, and can reduce the difficulty of assembling the elastic member 233.
- the diameter of the first guide column 2324 a is D 1
- the inner diameter of the elastic member 233 is D 2 , satisfying 0 mm ⁇ D 2 ⁇ D 1 ⁇ 5 mm.
- the elastic member 233 is a spring, and the inner diameter D2 of the elastic member 233 is the diameter of the cavity formed inside the spring.
- the size of the gap between the first guide column 2324a and the elastic member 233 is greater than 0mm and less than or equal to 5mm.
- the difference between the inner diameter of the elastic member 233 and the diameter of the first guide column 2324a can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.
- the difference between the inner diameter of the elastic member 233 and the diameter of the first guide column 2324a is greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic member 233 is not convenient to be assembled on the first guide column 2324a due to the difference between the inner diameter of the elastic member 233 and the diameter of the first guide column 2324a being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon when the elastic member 233 is sleeved on the first guide column 2324a.
- the phenomenon that the gap between the elastic member 233 and the first guide column 2324a is too large due to the difference between the inner diameter of the elastic member 233 and the diameter of the first guide column 2324a is too large can be alleviated, so as to reduce the radial movement or radial deformation of the elastic member 233, thereby improving the balance of the elastic force of the elastic member 233 acting on the blocking member 234, so as to reduce the risk of the blocking member 234 accidentally opening the air inlet 2322.
- a first limiting groove may be further provided on a side of the valve cover 2324 facing the blocking member 234 , and an end of the elastic member 233 away from the blocking member 234 is inserted into the first limiting groove.
- a first limiting groove is provided on the side of the valve cover 2324 facing the blocking member 234, that is, a first limiting groove is provided on the surface of the valve cover 2324 facing the blocking member 234 in the thickness direction X of the wall portion.
- the first limiting groove is provided on the surface of the valve cover 2324 on which the first guide column 2324a is protruding.
- One end of the elastic member 233 away from the blocking member 234 is inserted into the first limiting groove, that is, the end of the elastic member 233 away from the blocking member 234 abuts against the bottom surface of the first limiting groove.
- the elastic member 233 is a spring
- the first limiting groove is an annular groove structure.
- the first limiting groove is arranged around the outer side of the first guide column 2324a.
- the valve cover 2324 is also provided with a first limiting groove for inserting the elastic member 233 on one side facing the blocking member 234, so as to abut against the elastic member 233.
- One end on the valve cover 2324 plays a limiting role to reduce the relative radial slip between the elastic member 233 and the valve cover 2324, thereby improving the balance of the elastic force of the elastic member 233 acting on the blocking member 234, which is beneficial to improving the reliability of the elastic member 233.
- one end of the elastic member 233 away from the blocking member 234 is fixedly connected to the valve cover 2324 .
- the stability of the elastic member 233 resting on the valve cover 2324 can be improved, so as to further reduce the relative slippage between the elastic member 233 and the valve cover 2324, and further improve the balance of the elastic force of the elastic member 233 acting on the sealing member 234.
- FIG. 15 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application.
- the installation cavity 2321 penetrates the end of the valve body 232 away from the electrode assembly 22 and forms an air outlet 231 , and the shielding member 24 is arranged facing the air outlet 231 .
- the installation cavity 2321 passes through the end of the valve body 232 away from the electrode assembly 22 and forms an air outlet 231, that is, in an embodiment where the valve body 232 includes a valve body 2323 and a valve cover 2324, the valve body 232 is not provided with a valve cover 2324 to form an installation cavity 2321 inside the valve body 2323, and the installation cavity 2321 passes through the end of the valve body 2323 away from the electrode assembly 22 along the thickness direction X of the wall to form the air outlet 231.
- the one-way valve 23 By setting the installation cavity 2321 to pass through the end of the valve body 232 away from the electrode assembly 22 in the thickness direction X of the wall, so as to form an outlet 231 at the end of the valve body 232 away from the electrode assembly 22, and covering the outlet 231 by the covering member 24, the one-way valve 23 with this structure facilitates the assembly of the elastic member 233 and the sealing member 234 into the installation cavity 2321 through the air inlet 2322, which helps to reduce the difficulty of assembling the one-way valve 23.
- the air inlet 2322 may be provided on the side surface of the installation cavity 2321, that is, the blocking member 234 and the elastic member 233 are arranged along the radial direction of the installation cavity 2321, so that the blocking member 234 can block the air inlet 2322.
- the air inlet 2322 may also be provided on the cavity bottom surface of the installation cavity 2321, that is, the blocking member 234 and the elastic member 233 are arranged along the thickness direction X of the wall, so that the blocking member 234 can block the air inlet 2322. As shown in FIG.
- the shielding member 24 and the blocking member 234 are spaced apart, the two ends of the elastic member 233 are respectively against the shielding member 24 and the blocking member 234, and the air inlet 2322 is provided on the cavity bottom surface of the installation cavity 2321.
- the shielding member 24 is arranged to face the bottom surface of the installation cavity 2321, and the two ends of the elastic member 233 in the thickness direction X of the wall portion are respectively abutted against the shielding member 24 and the blocking member 234, so that the elastic member 233 is compressed between the shielding member 24 and the blocking member 234, so that the elastic member 233 can provide elastic force for the blocking member 234, so that the blocking member 234 can block the air inlet 2322 arranged on the bottom surface of the installation cavity 2321 under the action of the elastic force of the elastic member 233.
- the two ends of the elastic member 233 can respectively abut against the blocking member 24 and the blocking member 234, so that the blocking member 234 can block the air inlet 2322 arranged on the bottom surface of the installation cavity 2321 along the thickness direction X of the wall under the action of the elastic member 233. That is to say, the air inlet 2322 is arranged at one end of the valve body 2323 facing the electrode assembly 22 in the thickness direction X of the wall, and the blocking member 234 can move along the thickness direction X of the wall and block the air inlet 2322 under the action of the elastic member 233.
- the one-way valve 23 with this structure makes it easy for the elastic member 233 to apply elastic force to the blocking member 234, so that the blocking member 234 blocks the air inlet 2322, and can reduce the difficulty of assembling the elastic member 233.
- FIG. 5 is a partial cross-sectional view of the wall portion 211 of the outer shell 21 of the battery cell 20 provided in some embodiments of the present application.
- the wall portion 211 has a first surface 2112 away from the electrode assembly 22, and a mounting groove 2113 is provided on the first surface 2112.
- the shielding member 24 is assembled into the mounting groove 2113.
- the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111, and the mounting hole 2111 is connected to the interior of the outer shell 21.
- the valve body 2323 is installed in the mounting hole 2111 and protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion.
- the mounting hole 2111 includes a first hole section 2111a and a second hole section 2111b, the first hole section 2111a and the second hole section 2111b are arranged along the thickness direction X of the wall, and the first hole section 2111a is located on the side of the second hole section 2111b away from the electrode assembly 22, and the aperture of the first hole section 2111a is larger than the aperture of the second hole section 2111b.
- the valve body 2323 has a connecting portion 2323b located in the first hole section 2111a, the connecting portion 2323b is an annular structure extending along the circumference of the valve body 2323, and the connecting portion 2323b is welded to the hole wall surface of the first hole section 2111a to form a weld mark of the annular structure.
- a stress release groove 2323c is further provided on the connection portion 2323b, and the stress release groove 2323c is an annular groove structure.
- the stress release groove 2323c surrounds the outer side of the valve cover 2324, and in the embodiment where the valve body 232 is only provided with the valve body 2323, the stress release groove 2323c surrounds the outer side of the installation cavity 2321.
- the welding stress generated by the mutual welding of the connection portion 2323b and the hole wall surface of the first hole section 2111a can be released through the stress release groove 2323c, thereby reducing the influence of the welding stress on the weld connecting the hole wall surface of the first hole section 2111a and the connection portion 2323b, reducing the risk of cracking of the weld, and further reducing the risk of sealing failure at the weld.
- a second guide column 2341 is protrudingly provided on the side of the blocking member 234 facing the valve cover 2324 or the shielding member 24 , and a portion of the elastic member 233 is sleeved on the outer side of the second guide column 2341 .
- the elastic member 233 is a spring, part of which is sleeved on the outside of the second guide column 2341, and one end of the spring away from the valve cover 2324 or the shielding member 24 abuts against the surface of the blocking member 234 on which the second guide column 2341 is protruding, that is, the second guide column 2341 is inserted into the spring.
- the central axis of the second guide column 2341 coincides with the central axis of the mounting hole 2111
- the central axis of the elastic member 233 coincides with the central axis of the second guide column 2341 .
- a second guide column 2341 is protruded on one side of the blocking member 234 facing the valve cover 2324, and a portion of the elastic member 233 is sleeved on the second guide column.
- the one-way valve 23 with this structure can, on the one hand, play a certain positioning role on the elastic member 233 through the second guide column 2341, so as to facilitate the assembly of the elastic member 233, which is beneficial to reducing the difficulty of assembling the elastic member 233;
- the second guide column 2341 can play a certain guiding role when the elastic member 233 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 233 during the compression process, so that the elastic member 233 can be stably compressed along the thickness direction X of the wall, which is beneficial to improving the reliability of the elastic member 233, and further reducing the risk of the blocking member 234 accidentally opening the air inlet 2322.
- the diameter of the second guide column 2341 is D 3
- the inner diameter of the elastic member 233 is D 2 , satisfying 0 mm ⁇ D 3 ⁇ D 1 ⁇ 5 mm.
- the elastic member 233 is a spring, and the inner diameter D2 of the elastic member 233 is the diameter of the cavity formed inside the spring.
- the size of the gap between the second guide post 2341 and the elastic member 233 is greater than 0mm and less than or equal to 5mm.
- the difference between the inner diameter of the elastic member 233 and the diameter of the second guide column can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.
- the difference between the inner diameter of the elastic member 233 and the diameter of the second guide column 2341 is greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic member 233 is not convenient to be assembled on the second guide column 2341 due to the difference between the inner diameter of the elastic member 233 and the diameter of the second guide column 2341 being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon when the elastic member 233 is sleeved on the second guide column 2341.
- the phenomenon that the gap between the elastic member 233 and the second guide column 2341 is too large due to the difference between the inner diameter of the elastic member 233 and the diameter of the second guide column 2341 is too large can be alleviated, so as to reduce the radial movement or radial deformation of the elastic member 233, thereby improving the balance of the elastic force of the elastic member 233 acting on the blocking member 234, so as to reduce the risk of the blocking member 234 accidentally opening the air inlet 2322.
- a second limiting groove may be further provided on the side of the blocking member 234 facing the valve cover 2324 , and an end of the elastic member 233 away from the valve cover 2324 is inserted into the second limiting groove.
- a second limiting groove is provided on the side of the blocking member 234 facing the valve cover 2324, that is, a second limiting groove is provided on the surface of the blocking member 234 facing the valve cover 2324 in the thickness direction X of the wall portion.
- a second limiting groove is provided on the surface of the blocking member 234 on which the second guide column 2341 is protruding.
- One end of the elastic member 233 away from the valve cover 2324 is inserted into the second limiting groove, that is, the end of the elastic member 233 away from the valve cover 2324 abuts against the bottom surface of the second limiting groove.
- the elastic member 233 is a spring
- the second limiting groove is an annular groove structure.
- the second limiting groove is arranged around the outer side of the second guide column 2341.
- one end of the elastic member 233 away from the valve cover 2324 is fixedly connected to the blocking member 234 .
- the stability of the elastic member 233 resting on the blocking member 234 can be improved, so as to further reduce the relative slippage between the elastic member 233 and the blocking member 234, and further improve the balance of the elastic force of the elastic member 233 acting on the blocking member 234.
- the blocking member 234 may include a pressing portion 2342 and a sealing portion 2343.
- the sealing portion 2343 is connected to the side of the pressing portion 2342 that is away from the valve cover 2324 or the shielding member 24. The sealing portion 2343 is used to seal the air inlet 2322.
- the elastic member 233 can provide an elastic force for the pressing portion 2342 , so that the pressing portion 2342 can be pressed against the sealing portion 2343 , thereby sealing the air inlet 2322 through the sealing portion 2343 .
- the rigidity of the pressing portion 2342 is greater than that of the sealing portion 2343, that is, the anti-deformation capability of the pressing portion 2342 is greater than that of the sealing portion 2343, so that the pressing portion 2342 can better press the sealing portion 2343 onto the bottom surface of the installation cavity 2321 to block the air inlet 2322.
- the pressing portion 2342 can be made of a variety of materials, such as steel, iron or aluminum.
- the sealing portion 2343 can also be made of a variety of materials, such as rubber, silicone or plastic.
- connection structure between the pressing portion 2342 and the sealing portion 2343 may be various, such as clamping, bolting, or bonding.
- the second guide post 2341 is convexly disposed on the surface of the pressing portion 2342 facing the valve cover 2324 or the shielding member 24.
- the blocking member 234 is provided with a second limiting groove on the side facing the valve cover 2324, the second limiting groove is disposed on the surface of the pressing portion 2342 facing the valve cover 2324.
- the blocking member 234 By configuring the blocking member 234 to include a clamping portion 2342 and a sealing portion 2343, the clamping portion 2342 is disposed on the side of the sealing portion 2343 facing the valve cover 2324, the sealing portion 2343 is used to block the air inlet 2322, and the two ends of the elastic member 233 are respectively against the valve cover 2324 and the clamping portion 2342, so that the elastic member 233 can exert an elastic force on the sealing portion 2343 through the clamping portion 2342, which is beneficial to improving the balance of the elastic force of the elastic member 233 acting on the sealing portion 2343, and further can effectively improve the sealing effect of the sealing portion 2343 on the air inlet 2322.
- the pressing portion 2342 has a side facing the sealing portion 2343 provided with a snap-fit groove 2342a, and the sealing portion 2343 has a side facing the pressing portion 2342 protruding with a snap-fit portion 2343a.
- the plugging member 234 with such a structure can improve the structural stability of the sealing portion 2343 disposed on the pressing portion 2342, thereby reducing the radial slippage of the sealing portion 2343 relative to the pressing portion 2342, thereby facilitating the sealing portion 2343 to block the air inlet 2322, thereby reducing the phenomenon of the air inlet 2322 being opened by mistake.
- the clamping portion 2343a is a circular columnar structure, and correspondingly, the clamping groove 2342a is a circular groove.
- the sealing portion 2343 is bonded to the pressing portion 2342.
- the bonding structure used to connect the sealing portion 2343 and the pressing portion 2342 can, on the one hand, improve the structural stability of the sealing portion 2343 connected to the pressing portion 2342, which is conducive to reducing the risk of the sealing portion 2343 and the pressing portion 2342 being separated from each other, so as to improve the reliability of the sealing portion 2343 blocking the air inlet 2322, and on the other hand, it is easy to realize the assembly connection between the sealing portion 2343 and the pressing portion 2342, which is conducive to reducing the difficulty of assembly between the sealing portion 2343 and the pressing portion 2342.
- the material of the sealing part 2343 includes EPDM, fluororubber or Teflon.
- the sealing part 2343 made of EPDM, fluororubber or Teflon makes the sealing part 2343 have good corrosion resistance, which can effectively alleviate the phenomenon that the sealing part 2343 is corroded by the electrolyte, thereby facilitating the service life of the sealing part 2343 and reducing the phenomenon that the sealing part 2343 has a poor effect of blocking the air inlet 2322 due to the corrosion of the sealing part 2343.
- the blocking member 234 may not be provided with the pressing portion 2342 , and the blocking member 234 only includes the sealing portion 2343 , and one end of the elastic member 233 directly abuts against the sealing portion 2343 .
- the size of the gap between the valve cover 2324 and the blocking member 234 is L, satisfying 0 mm ⁇ L ⁇ 2 mm.
- the size of the gap between the valve cover 2324 and the blocking member 234 is L, that is, the distance between the valve cover 2324 and the blocking member 234 in the thickness direction X of the wall is L.
- the size L of the gap between the valve cover 2324 and the sealing member 234 can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, etc.
- L is the dimension of the gap formed between the first guide column 2324a and the second guide column 2341 in the thickness direction X of the wall; in the embodiment in which the valve cover 2324 is protrudingly provided with the first guide column 2324a and the sealing member 234 is not protrudingly provided with the second guide column 2341, L is the dimension of the gap formed between the first guide column 2324a and the surface of the sealing member 234 facing the valve cover 2324 in the thickness direction X of the wall; in the embodiment in which the valve cover 2324 is not protrudingly provided with the first guide column 2324a and the sealing member 234 is protrudingly provided with the second guide column 2341, L is the dimension of the gap formed between the second guide column 2341 and the surface of the valve cover 2324 facing the sealing member 234 in the thickness
- the obstruction of the valve cover 2324 to the blocking piece 234 can be reduced, so that there is space between the valve cover 2324 and the blocking piece 234 for the blocking piece 234 to move along the thickness direction X of the wall, so that when the gas inside the shell 21 pushes the blocking piece 234, the blocking piece 234 can open the air inlet 2322 for exhaust.
- the phenomenon that the one-way valve 23 occupies too much space in the thickness direction X of the wall due to the excessive gap between the valve cover 2324 and the blocking piece 234 can be alleviated, which is beneficial to improving the space utilization rate of the battery cell 20.
- the battery cell 20 may also include an insulating member 28, which is disposed on the side of the wall portion 211 facing the electrode assembly 22.
- the valve body 232 of the one-way valve 23 protrudes from the surface of the wall portion 211 facing the electrode assembly 22, and the insulating member 28 includes a main body portion 281 and a receiving portion 282.
- the main body portion 281 is disposed on the side of the wall portion 211 facing the electrode assembly 22, and the receiving portion 282 is connected to the main body portion 281.
- the portion of the valve body 232 of the one-way valve 23 protruding from the surface of the wall portion 211 facing the electrode assembly 22 is accommodated in the receiving portion 282.
- the insulating member 28 is disposed on a side of the wall portion 211 facing the electrode assembly 22 , and the insulating member 28 serves to separate the wall portion 211 from the electrode assembly 22 to insulate and isolate the wall portion 211 from the electrode assembly 22 .
- the insulating member 28 may be made of various materials, such as rubber, silicone or plastic.
- the portion of the valve body 232 of the one-way valve 23 that protrudes from the surface of the wall portion 211 facing the electrode assembly 22 is accommodated in the accommodating portion 282, that is, the accommodating portion 282 is formed at the position of the insulating member 28 corresponding to the one-way valve 23, and the accommodating portion 282 covers the outer side of the portion of the valve body 232 of the one-way valve 23 that protrudes from the surface of the wall portion 211 facing the electrode assembly 22.
- the main body 281 and the receiving portion 282 of the insulating member 28 may be an integral structure or a split structure.
- the main body 281 and the receiving portion 282 may be integrally formed by injection molding or milling.
- the receiving portion 282 may be connected to the main body 281 by bonding or snap-fitting.
- the main body 281 and the receiving portion 282 are an integral structure.
- the accommodating portion 282 is provided with a second through hole 2821 , and the second through hole 2821 is communicated with the air inlet 2322 provided on the valve body 232 .
- a second through hole 2821 is set on the accommodating portion 282, and the second through hole 2821 penetrates the accommodating portion 282, so that the second through hole 2821 can connect the interior of the accommodating portion 282 and the interior of the shell 21, so that the air inlet 2322 of the valve body 232 can connect to the interior of the shell 21 through the second through hole 2821.
- the second through hole 2821 can connect the interior of the shell 21 and the interior of the accommodating portion 282, so that the air inlet 2322 of the valve body 232 of the one-way valve 23 can be connected with the interior of the shell 21 through the second through hole 2821, so that the gas inside the shell 21 can enter the accommodating portion 282 through the second through hole 2821 and then be discharged to the outside of the shell 21 through the one-way valve 23. Therefore, there is no need for the gas to enter the accommodating portion 282 through the gap between the main body 281 and the wall portion 211 and then be discharged through the one-way valve 23, which is beneficial to improving the smoothness of the one-way valve 23 to discharge the gas inside the shell 21.
- the air inlet 2322 is disposed at one end of the valve body 232 facing the electrode assembly 22.
- the accommodating portion 282 includes a first wall 2822 and a second wall 2823, the first wall 2822 is disposed around the valve body 232, along the thickness direction X of the wall portion, one end of the first wall 2822 is connected to the body portion 281, the second wall 2823 is connected to one end of the first wall 2822 away from the body portion 281, and the second through hole 2821 is disposed in the second wall 2823.
- the first wall 2822 is disposed around the valve body 232 , that is, the first wall 2822 of the accommodating portion 282 is an annular structure disposed around the valve body 232 .
- first wall 2822 is connected to the main body 281, and the second wall 2823 is connected to the end of the first wall 2822 away from the main body 281. That is, the second wall 2823 is connected to the main body 281 through the first wall 2822, and the second wall 2823 and the first wall 2822 together enclose a accommodating portion 282 for accommodating part of the valve body 232.
- the second wall 2823 is a wall facing the accommodating portion 282 and the air inlet 2322.
- the second through hole 2821 is disposed on the second wall 2823, that is, the second through hole 2821 is disposed on one end of the accommodating portion 282 facing the electrode assembly 22.
- the second through hole 2821 may also be disposed on the first wall 2822, that is, the second through hole 2821 is disposed on one side of the accommodating portion 282 in the radial direction of the accommodating portion 282.
- the accommodating portion 282 is provided with a first wall 2822 and a second wall 2823 which are connected to each other.
- the first wall 2822 is arranged around the valve body 232, and the second wall 2823 is located at one end of the valve body 232 facing the electrode assembly 22 in the thickness direction X of the wall portion, so that the first wall 2822 and the second wall 2823 enclose a accommodating portion 282 for accommodating the portion of the valve body 232 extending to the inside of the outer shell 21.
- the second through hole 2821 of the accommodating portion 282 By arranging the second through hole 2821 of the accommodating portion 282 on the second wall 2823, it is helpful to realize the corresponding arrangement of the air inlet 2322 and the second through hole 2821, so as to improve the smoothness of the one-way valve 23 discharging the gas inside the outer shell 21.
- the material of the shielding member 24 is the same as the material of the wall portion 211 .
- the material of the shielding member 24 and the material of the wall portion 211 can both be copper, iron, aluminum, steel, or aluminum alloy.
- the shielding member 24 and the wall portion 211 By setting the shielding member 24 and the wall portion 211 to be structures of the same material, on the one hand, it is convenient to assemble the shielding member 24 and the wall portion 211 of the same material to each other, such as welding, which helps to reduce the difficulty of assembling the shielding member 24 on the wall portion 211. On the other hand, it can make the appearance of the shielding member 24 and the wall portion 211 the same, which helps to improve the aesthetic appearance of the battery cell 20.
- the housing 21 may include a shell 212 and an end cap 213.
- the shell 212 has an interior formed with an accommodation cavity having an opening 2121, the accommodation cavity is used to accommodate the electrode assembly 22, and the end cap 213 closes the opening 2121, and the end cap 213 is a wall portion 211.
- the end cover 213 is the wall portion 211 , that is, the one-way valve 23 is disposed on the end cover 213 .
- the structure of the battery cell 20 is not limited to this.
- the battery cell 20 can also be other structures.
- the shell 212 includes a wall portion 211, that is, the one-way valve 23 is installed on a wall of the shell 212.
- the one-way valve 23 can be installed on the bottom wall of the shell 212 and the end cover 213, or it can be installed on the side wall of the shell 212 and the end cover 213 that are adjacent to and interconnected.
- the battery cell 20 with such a structure is convenient for installing the one-way valve 23 on the end cover 213, which is conducive to reducing the difficulty of assembling the battery cell 20, so as to improve the production efficiency of the battery cell 20.
- the battery cell 20 with such a structure can reduce the influence of the stress generated when the end cover 213 and the shell 212 are connected to each other on the one-way valve 23, so as to alleviate the phenomenon of damage to the one-way valve 23, and thus can improve the stability and service life of the battery cell 20.
- the battery cell 20 further includes a pressure relief mechanism 27 , which is disposed on the outer shell 21 .
- the pressure relief mechanism 27 is configured to actuate and release the internal pressure of the battery cell 20 when the battery cell 20 thermally runs away.
- the actuation pressure of the pressure relief mechanism 27 is greater than the opening pressure of the one-way valve 23 .
- the pressure relief mechanism 27 is disposed on the outer shell 21 , and may be disposed on the end cover 213 or on the shell 212 .
- the pressure relief mechanism 27 is disposed on the end cover 213 .
- the pressure relief mechanism 27 is configured to be actuated and release the internal pressure of the battery cell 20 when the battery cell 20 thermally runs away, that is, when thermal runaway occurs inside the battery cell 20, the pressure relief mechanism 27 can be actuated and opened to release the gas generated inside the battery cell 20 due to thermal runaway.
- the actuation pressure of the pressure relief mechanism 27 is greater than the opening pressure of the one-way valve 23, that is, the pressure of the gas inside the shell 21 to open the pressure relief mechanism 27 is greater than the pressure of the gas inside the shell 21 to open the one-way valve 23. It should be noted that when the battery cell 20 has thermal runaway, the gas inside the shell 21 of the battery cell 20 will increase rapidly to open the pressure relief mechanism 27 for pressure relief, while the gas generated inside the shell 21 of the battery cell 20 during normal use can open the one-way valve 23 when it reaches the threshold, but the pressure relief mechanism 27 cannot be opened.
- the pressure relief mechanism 27 can be an integral structure with the housing 21, or a separate structure. If the pressure relief mechanism 27 can be an integral structure with the housing 21, the pressure relief mechanism 27 is an area on the housing 21 where a weak structure is provided, for example, an area on the housing 21 where a notch groove is provided; if the pressure relief mechanism 27 can be a separate structure from the housing 21, the pressure relief mechanism 27 can be connected to the housing 21 by welding, hot melting, injection molding or bonding. Exemplarily, in FIG4 , the pressure relief mechanism 27 is a separate structure from the housing 21, and the pressure relief mechanism 27 is provided on the end cover 213 of the housing 21.
- the pressure relief mechanism 27 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.
- the electrode terminal 26 and the pressure relief mechanism 27 are both disposed on the end cover 213 .
- the electrode terminal 26 and the pressure relief mechanism 27 may also be disposed on different walls of the outer shell 21 .
- the pressure relief mechanism 27 is disposed on the shell 212
- the electrode terminal 26 is disposed on the end cover 213 .
- the opening pressure of the one-way valve 23 for exhaust By setting the opening pressure of the one-way valve 23 for exhaust to be lower than the actuating pressure of the pressure relief mechanism 27 for pressure relief, when gas is generated inside the outer shell 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer shell 21 through the one-way valve 23, thereby alleviating the phenomenon that the pressure relief mechanism 27 actuates pressure relief in advance before the thermal runaway of the battery cell 20 due to the increase in internal air pressure of the battery cell 20, thereby effectively improving the use stability of the battery cell 20, thereby improving the service life and reliability of the battery cell 20.
- the one-way valve 23 and the pressure relief mechanism 27 may be disposed on the same wall of the housing 21.
- the one-way valve 23 and the pressure relief mechanism 27 are both disposed on the end cover 213.
- the one-way valve 23 and the pressure relief mechanism 27 may be disposed on different walls of the housing 21.
- the one-way valve 23 is disposed on the end cover 213, and the pressure relief mechanism 27 is disposed on the housing 212.
- the exhaust rate of the one-way valve 23 is smaller than the exhaust rate of the pressure relief mechanism 27 .
- the battery cell 20 can be protected from thermal runaway.
- the phenomenon that the pressure relief mechanism 27 cannot be actuated and opened due to the one-way valve 23 exhausting air too quickly is alleviated, so that the pressure relief mechanism 27 can be actuated and stably discharge the internal pressure of the battery cell 20 when the battery cell 20 is in thermal runaway, which is beneficial to reduce the risk of fire and explosion of the battery cell 20 when the battery cell 20 is in thermal runaway.
- the battery cell 20 is an alkali metal battery, such as a sodium metal battery, a lithium metal battery, etc.
- the alkali metal battery is used in conjunction with the one-way valve 23 to timely discharge the gas generated by the alkali metal battery during normal operation, thereby increasing the service life of the alkali metal battery.
- the present application further provides a battery 100 , and the battery 100 includes a battery cell 20 of any of the above solutions.
- the battery 100 may further include a box body 10, in which the battery cell 20 is accommodated.
- the box body 10 may include a first box body 11 and a second box body 12, which cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.
- the second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space.
- the structure of the box body 10 is not limited thereto, and in other embodiments, the first box body 11 and the second box body 12 may also be hollow structures both with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.
- the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid, etc.
- the box body 10 is a cuboid structure.
- the battery cell 20 disposed in the housing 10 may be one or more.
- a plurality of battery cells 20 are disposed in the housing 10 of the battery 100, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection.
- Mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel.
- the plurality of battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the plurality of battery cells 20 may be accommodated in the housing 10; of course, the battery 100 may also be a battery module formed by first connecting a plurality of battery cells 20 in series, in parallel, or in mixed connection, and then the plurality of battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the housing 10.
- the battery 100 may further include other structures.
- the battery 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .
- the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20.
- the box 10 may be used as a part of the electrical device.
- the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.
- the present application further provides an electrical device, which includes a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.
- the electrical device may be any of the aforementioned devices or systems using the battery cell 20 .
- the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, a one-way valve 23, and a shielding member 24.
- the shell 21 has a wall portion 211, and the shell 21 includes a shell 212 and an end cover 213.
- the shell 212 has a receiving cavity with an opening 2121 formed inside, and the electrode assembly 22 is received in the receiving cavity.
- the end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211.
- the wall portion 211 has a first surface 2112 away from the electrode assembly 22, and the first surface 2112 is provided with a mounting groove 2113, and the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111, and the one-way valve 23 is installed in the mounting hole 2111 and protrudes from the surface of the wall portion 211 facing the electrode assembly 22, and the one-way valve 23 is used to discharge the gas inside the shell 21.
- the one-way valve 23 includes a valve body 232, an elastic member 233 and a blocking member 234.
- the valve body 232 is disposed on the wall portion 211, and a mounting cavity 2321 is formed inside the valve body 232.
- the valve body 232 is provided with an air inlet 2322 and an air outlet 231.
- the air inlet 2322 is used to connect the mounting cavity 2321 with the interior of the housing 21, and the air outlet 231 is used to connect the mounting cavity 2321 with the exhaust passage 25.
- the elastic member 233 is disposed in the mounting cavity 2321, and the blocking member 234 is movably disposed in the mounting cavity 2321.
- the blocking member 234 is used to block the air inlet 2322 under the action of the elastic member 233, and is used to open the air inlet 2322 under the action of the gas inside the housing 21.
- the valve body 232 includes a valve body 2323 and a valve cover 2324.
- the valve body 2323 is installed in the installation hole 2111, and an air inlet 2322 is provided at one end of the valve body 2323 facing the electrode assembly 22.
- the valve cover 2324 is connected to one end of the valve body 2323 away from the electrode assembly 22 along the thickness direction X of the wall.
- the valve cover 2324 and the valve body 2323 are enclosed together to form an installation cavity 2321.
- the valve cover 2324 is provided with an air outlet 231.
- the valve cover 2324 and the blocking member 234 are arranged at intervals.
- the two ends of the elastic member 233 are respectively against the valve cover 2324 and the blocking member 234.
- the air inlet 2322 is provided on the bottom surface of the installation cavity 2321.
- the shielding member 24 is installed in the installation groove 2113, and the material of the shielding member 24 is the same as that of the wall 211.
- the shielding member 24 is located on the side of the one-way valve 23 away from the electrode assembly 22, and the shielding member 24 covers the one-way valve 23.
- An exhaust channel 25 is formed between the shielding member 24 and the wall portion 211, and the exhaust channel 25 communicates with the gas outlet 231 and the outside of the housing 21.
- the exhaust channel 25 includes a first exhaust gap 251 and a second exhaust gap 252.
- the first exhaust gap 251 is formed between the shielding member 24 and the groove side of the mounting groove 2113.
- the cross-section of the shielding member 24 and the mounting groove 2113 in the thickness direction X perpendicular to the wall is rectangular, the outer peripheral surface of the shielding member 24 includes four first corner surfaces 241 and four first side surfaces 242, each two adjacent first side surfaces 242 are connected by a first corner surface 241, the bottom surface of the mounting groove 2113 includes four second corner surfaces 2113a and four second side surfaces 2113b, each two adjacent second side surfaces 2113b are connected by a second corner surface 2113a, each first side surface 242 and the corresponding second side surface 2113b are mutually abutted and welded, and a first exhaust gap 251 is formed between each first corner surface 241 and the corresponding second corner surface 2113a.
- the first corner surface 241 and the second corner surface 2113a are both arc surfaces, and the radius of the first corner surface 241 is greater than the radius of the second corner surface 2113a.
- the shielding member 24 has a second surface 245 facing the one-way valve 23 and a third surface 246 facing away from the one-way valve 23.
- the second surface 245 overlaps the bottom surface of the installation groove 2113, and the third surface 246 is flush with the first surface 2112.
- the second surface 245 is provided with four first grooves 2451, and the first groove 2451 extends along the radial direction of the shielding member 24 and penetrates a first corner surface 241.
- a second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the groove of the installation groove 2113.
- the second surface 245 is also provided with a second groove 2452.
- the plurality of first grooves 2451 are arranged around the second groove 2452 and are all connected to the second groove 2452.
- the second groove 2452 is connected to the air outlet 231.
- the air outlet 231 is arranged facing the second groove 2452, and the projection of the air outlet 231 is located in the second groove 2452.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
Claims (29)
- 一种电池单体,包括:外壳,具有壁部;电极组件,容纳于所述外壳内;单向阀,设置于所述壁部,所述单向阀具有出气口,所述出气口用于排出所述外壳内部的气体;以及遮挡件,安装于所述壁部,沿所述壁部的厚度方向,所述遮挡件位于所述单向阀背离所述电极组件的一侧,且所述遮挡件覆盖所述单向阀,所述遮挡件与所述壁部之间形成有排气通道,所述排气通道连通所述出气口和所述外壳的外部。
- 根据权利要求1所述的电池单体,其中,沿所述壁部的厚度方向,所述壁部具有背离所述电极组件的第一表面,所述第一表面设置有安装槽,所述安装槽的槽底面设置有安装孔,所述单向阀的至少部分设置于所述安装孔内,所述遮挡件的至少部分容纳于所述安装槽内。
- 根据权利要求2所述的电池单体,其中,所述排气通道包括第一排气间隙,所述第一排气间隙形成于所述遮挡件与所述安装槽的槽侧面之间,所述第一排气间隙用于连通所述出气口和所述外壳的外部。
- 根据权利要求3所述的电池单体,其中,所述遮挡件的外周面包括第一拐角面和至少两个第一侧面,所述第一拐角面连接相邻的两个所述第一侧面;所述安装槽的槽侧面包括第二拐角面和至少两个第二侧面,所述第二拐角面连接相邻的两个所述第二侧面,每个所述第二侧面与一个所述第一侧面相连,所述第二拐角面与所述第一拐角面之间形成所述第一排气间隙。
- 根据权利要求4所述的电池单体,其中,所述第一拐角面和所述第二拐角面均为圆弧面,所述第一拐角面的半径大于所述第二拐角面的半径。
- 根据权利要求4或5所述的电池单体,其中,所述第一侧面与所述第二侧面焊接连接。
- 根据权利要求4-6任一项所述的电池单体,其中,所述遮挡件在垂直于所述壁部的厚度方向上的横截面为矩形,所述遮挡件的外周面包括四个所述第一侧面和四个所述第一拐角面,至少一个所述第一拐角面处形成有所述第一排气间隙。
- 根据权利要求3所述的电池单体,其中,所述遮挡件的外周面设置有凹槽,所述凹槽的槽底面与所述安装槽的槽侧面之间形成所述第一排气间隙。
- 根据权利要求8所述的电池单体,其中,所述遮挡件的外周面未设置所述凹槽的区域与所述安装槽的槽侧面焊接连通。
- 根据权利要求3所述的电池单体,其中,所述遮挡件的外周面凸设有多个凸部,多个所述凸部沿所述遮挡件的周向间隔排布,所述凸部抵接于所述安装槽的槽侧面,所述遮挡件的外周面未设置所述凸部的区域与所述安装槽的槽侧面之间形成所述第一排气间隙。
- 根据权利要求10所述的电池单体,其中,所述凸部与所述安装槽的槽侧面过盈配合。
- 根据权利要求3-11任一项所述的电池单体,其中,所述排气通道还包括第二排气间隙,所述第二排气间隙形成于所述遮挡件与所述安装槽的槽底面之间,所述第二排气间隙连通所述第一排气间隙和所述出气口。
- 根据权利要求12所述的电池单体,其中,沿所述壁部的厚度方向,所述遮挡件具有面向所述单向阀的第二表面,所述第二表面搭接于所述安装槽的槽底面,所述第二表面设置有第一槽,所述第一槽的槽底面与所述安装槽的槽底面之间形成所述第二排气间隙。
- 根据权利要求13所述的电池单体,其中,所述遮挡件与所述安装槽的槽侧面之间形成有多个所述第一排气间隙,多个所述第一排气间隙沿所述遮挡件的周向间隔排布,所述第二表面上设置有多个所述第一槽,每个所述第一排气间隙与一个所述第一槽连通。
- 根据权利要求14所述的电池单体,其中,所述第二表面还设置有第二槽,多个所述第一槽设置于所述第二槽的周围并均与所述第二槽连通,所述第二槽与所述出气口连通。
- 根据权利要求15所述的电池单体,其中,沿所述壁部的厚度方向,所述出气口设置于所述单向阀背离所述电极组件的一端,所述出气口面向所述第二槽设置,且所述出气口的投影位于所述第二槽内。
- 根据权利要求2-16任一项所述的电池单体,其中,沿所述壁部的厚度方向,所述遮挡件不超出所述第一表面。
- 根据权利要求17所述的电池单体,其中,所述遮挡件具有背离所述单向阀的第三表面,所述第三表面与所述第一表面平齐。
- 根据权利要求2-18任一项所述的电池单体,其中,沿所述壁部的厚度方向,所述单向阀不超出所述安装槽的槽底面。
- 根据权利要求1-19任一项所述的电池单体,其中,所述遮挡件与所述壁部固定连接。
- 根据权利要求1-20任一项所述的电池单体,其中,所述单向阀包括:阀体,设置于所述壁部,所述阀体的内部形成有安装腔,所述阀体上设置有进气口和所述出气口,所述进气口用于连通所述安装腔和所述外壳的内部,所述出气口用于连通所述安装腔和所述排气通道;弹性件,设置于所述安装腔内;封堵件,可移动地设置于所述安装腔内,所述封堵件用于在所述弹性件的作用下封堵所述进气口,且用于在所述外壳内部的气体的作用下打开所述进气口。
- 根据权利要求21所述的电池单体,其中,所述阀体包括:阀本体,设置于所述壁部,所述阀本体设置有所述进气口;阀盖,沿所述壁部的厚度方向,所述阀盖设置于所述阀本体背离所述电极组件的一端,所述阀盖与所述阀本体共同围合形成所述安装腔,所述阀盖设置有所述出气口。
- 根据权利要求22所述的电池单体,其中,沿所述壁部的厚度方向,所述阀盖与所述封堵件间隔设置,所述弹性件的两端分别抵靠于所述阀盖和所述封堵件,所述进气口设置于所述安装腔的腔底面。
- 根据权利要求21所述的电池单体,其中,沿所述壁部的厚度方向,所述安装腔贯穿所述阀体背离所述电极组件的一端并形成所述出气口,所述遮挡件面向所述出气口设置。
- 根据权利要求24所述的电池单体,其中,沿所述壁部的厚度方向,所述遮挡件与所述封堵件间隔设置,所述弹性件的两端分别抵靠于所述遮挡件和所述封堵件,所述进气口设置于所述安装腔的腔底面。
- 根据权利要求1-25任一项所述的电池单体,其中,所述遮挡件的材质与所述壁部的材质相同。
- 根据权利要求1-26任一项所述的电池单体,其中,所述外壳包括:壳体,内部形成具有开口的容纳腔,所述容纳腔用于容纳所述电极组件;端盖,封闭所述开口;其中,所述端盖为所述壁部;或所述壳体包括所述壁部。
- 一种电池,包括如权利要求1-27任一项所述的电池单体。
- 一种用电装置,包括如权利要求1-27任一项所述的电池单体,所述电池单体用于提供电能。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020267000923A KR20260021066A (ko) | 2023-06-16 | 2023-10-19 | 배터리셀, 배터리 및 전기 장치 |
| EP23941270.3A EP4730531A1 (en) | 2023-06-16 | 2023-10-19 | Battery cell, battery and electrical device |
| JP2025563752A JP2026515925A (ja) | 2023-06-16 | 2023-10-19 | 電池セル、電池及び電力消費装置 |
| US19/370,811 US20260051643A1 (en) | 2023-06-16 | 2025-10-28 | Battery cell, battery, and electric apparatus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310726909.4A CN119153883A (zh) | 2023-06-16 | 2023-06-16 | 电池单体、电池及用电装置 |
| CN202310726909.4 | 2023-06-16 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US19/370,811 Continuation US20260051643A1 (en) | 2023-06-16 | 2025-10-28 | Battery cell, battery, and electric apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024255046A1 true WO2024255046A1 (zh) | 2024-12-19 |
Family
ID=93800510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2023/125422 Ceased WO2024255046A1 (zh) | 2023-06-16 | 2023-10-19 | 电池单体、电池及用电装置 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20260051643A1 (zh) |
| EP (1) | EP4730531A1 (zh) |
| JP (1) | JP2026515925A (zh) |
| KR (1) | KR20260021066A (zh) |
| CN (1) | CN119153883A (zh) |
| WO (1) | WO2024255046A1 (zh) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119742531B (zh) * | 2025-03-05 | 2025-06-27 | 宁德时代新能源科技股份有限公司 | 一种电池单体、电池装置和用电装置 |
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| CN208173641U (zh) * | 2018-05-18 | 2018-11-30 | 宁德时代新能源科技股份有限公司 | 二次电池顶盖组件及二次电池 |
| CN208189650U (zh) * | 2018-05-18 | 2018-12-04 | 宁德时代新能源科技股份有限公司 | 二次电池顶盖组件及二次电池 |
| CN208507795U (zh) * | 2018-04-24 | 2019-02-15 | 浙江虹达特种橡胶制品有限公司 | 一种锂电池单向排泄安全阀 |
| CN110021727A (zh) * | 2018-01-10 | 2019-07-16 | 宁德时代新能源科技股份有限公司 | 单向透气阀、二次电池的顶盖组件及二次电池 |
| CN215342865U (zh) * | 2021-07-28 | 2021-12-28 | 蜂巢能源科技有限公司 | 一种防爆结构、顶盖组件及锂电池 |
| CN218070012U (zh) * | 2022-08-17 | 2022-12-16 | 厦门海辰储能科技股份有限公司 | 一种电池的端盖组件、电池、电池包及用电设备 |
| CN219040686U (zh) * | 2022-12-16 | 2023-05-16 | 深圳为方能源科技有限公司 | 一种电池顶盖及水系钠离子电池 |
-
2023
- 2023-06-16 CN CN202310726909.4A patent/CN119153883A/zh active Pending
- 2023-10-19 KR KR1020267000923A patent/KR20260021066A/ko active Pending
- 2023-10-19 EP EP23941270.3A patent/EP4730531A1/en active Pending
- 2023-10-19 WO PCT/CN2023/125422 patent/WO2024255046A1/zh not_active Ceased
- 2023-10-19 JP JP2025563752A patent/JP2026515925A/ja active Pending
-
2025
- 2025-10-28 US US19/370,811 patent/US20260051643A1/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110021727A (zh) * | 2018-01-10 | 2019-07-16 | 宁德时代新能源科技股份有限公司 | 单向透气阀、二次电池的顶盖组件及二次电池 |
| CN208507795U (zh) * | 2018-04-24 | 2019-02-15 | 浙江虹达特种橡胶制品有限公司 | 一种锂电池单向排泄安全阀 |
| CN208173641U (zh) * | 2018-05-18 | 2018-11-30 | 宁德时代新能源科技股份有限公司 | 二次电池顶盖组件及二次电池 |
| CN208189650U (zh) * | 2018-05-18 | 2018-12-04 | 宁德时代新能源科技股份有限公司 | 二次电池顶盖组件及二次电池 |
| CN215342865U (zh) * | 2021-07-28 | 2021-12-28 | 蜂巢能源科技有限公司 | 一种防爆结构、顶盖组件及锂电池 |
| CN218070012U (zh) * | 2022-08-17 | 2022-12-16 | 厦门海辰储能科技股份有限公司 | 一种电池的端盖组件、电池、电池包及用电设备 |
| CN219040686U (zh) * | 2022-12-16 | 2023-05-16 | 深圳为方能源科技有限公司 | 一种电池顶盖及水系钠离子电池 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4730531A1 (en) | 2026-04-22 |
| CN119153883A (zh) | 2024-12-17 |
| US20260051643A1 (en) | 2026-02-19 |
| KR20260021066A (ko) | 2026-02-12 |
| JP2026515925A (ja) | 2026-05-19 |
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