CN116742284A - Energy storage device, power utilization system and energy storage system - Google Patents
Energy storage device, power utilization system and energy storage system Download PDFInfo
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- CN116742284A CN116742284A CN202311032220.8A CN202311032220A CN116742284A CN 116742284 A CN116742284 A CN 116742284A CN 202311032220 A CN202311032220 A CN 202311032220A CN 116742284 A CN116742284 A CN 116742284A
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- 239000004033 plastic Substances 0.000 claims abstract description 392
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- 239000007788 liquid Substances 0.000 claims description 47
- 238000006243 chemical reaction Methods 0.000 claims description 39
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- 239000011324 bead Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- 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
- H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application relates to an energy storage device, an electricity utilization system and an energy storage system. The energy storage device comprises an end cover assembly, an adapter and an electrode assembly, wherein the end cover assembly comprises a lower plastic part and a pole, the lower plastic part is provided with a first surface and a second surface which are opposite to each other, a through hole penetrates through the first surface and the second surface, the through hole comprises a first hole section and a second hole section which are communicated, the radial size of the first hole section is smaller than that of the second hole section, and the second hole section is closer to the second surface; the pole comprises a penetrating part and a flange part, the penetrating part is arranged on the first hole section, the flange part is arranged on the second hole section, and the surface of the flange part deviating from the penetrating part is flush with the second surface; the adapter is arranged on one side of the flange part, which is away from the lower plastic part, and is electrically connected with the flange part, and the surface of the adapter, which faces the end cover assembly, is propped against the second surface; the electrode assembly is arranged on one side of the adapter, which is away from the end cover assembly, and comprises an electrode pole piece and a pole lug which are electrically connected, wherein the pole lug is electrically connected with the adapter. The energy storage device has a longer service life.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an energy storage device, an electricity utilization system and an energy storage system.
Background
In the related art, an energy storage device employs a switching piece to electrically connect a tab of an electrode assembly with a tab of an end cap assembly, so as to realize a charging and discharging process of the energy storage device. However, the gap between the electrode assembly and the adapter piece is smaller, so that the electrode lug is excessively bent when being welded with the adapter piece, and after a period of use, the electrode lug is easy to break, so that the service life of the energy storage device is shortened.
Disclosure of Invention
In view of the above, the present application provides an energy storage device, an electrical system and an energy storage system, wherein an electrode assembly of the energy storage device has a longer service life, and the service life of the energy storage device is further prolonged.
The application provides an energy storage device, which comprises an end cover assembly, an adapter and an electrode assembly, wherein the end cover assembly comprises a lower plastic part and a pole, the lower plastic part is provided with a first surface and a second surface which are oppositely arranged, the lower plastic part is also provided with a through hole penetrating through the first surface and the second surface, the through hole comprises a first hole section and a second hole section which are communicated, the radial dimension of the first hole section is smaller than that of the second hole section, and the second hole section is closer to the second surface than the first hole section; the pole comprises a penetrating part and a flange part, the penetrating part is convexly arranged on the flange part, the penetrating part is arranged on the first hole section, the flange part is arranged on the second hole section, and the surface of the flange part, deviating from the penetrating part, is flush with the second surface; the adapter is arranged on one side, away from the lower plastic part, of the flange part, the adapter is electrically connected with the flange part, and the surface, facing the end cover assembly, of the adapter abuts against the second surface; the electrode assembly is arranged on one side, deviating from the end cover assembly, of the adapter, the electrode assembly comprises an electrode pole piece and a pole lug which are electrically connected, and the pole lug is electrically connected with the adapter.
Further, the adaptor comprises a first adaptor part, a second adaptor part and a third adaptor part, wherein the second adaptor part and the third adaptor part are arranged on the same side of the first adaptor part at intervals along a first direction and are respectively and electrically connected with the first adaptor part; the second switching part and the third switching part are arranged at intervals along a second direction, the first switching part is electrically connected with the flange part, and the second switching part and the third switching part are electrically connected with one end of the tab; the first direction is the length direction of the end cover assembly, and the second direction is the width direction of the end cover assembly; along the second direction, the width d1 of the second adapting portion satisfies the range: d1 is less than or equal to 18.18mm and less than or equal to 22.88mm, and the width d2 of the third switching part meets the range: d2 is more than or equal to 18.18mm and less than or equal to 22.88mm.
Further, the number of the lower plastic parts is two, the two lower plastic parts comprise a first plastic part and a second plastic part, and the first plastic part and the second plastic part are arranged at intervals along the first direction; the first transfer part is arranged opposite to the first plastic part, and the first transfer part, the second transfer part and the third transfer part of the first transfer part are surrounded to form an opening; the first plastic part comprises a first plastic body and a liquid feeding part, the first plastic body is provided with the first surface, the second surface and the through hole, and the orthographic projection of the liquid feeding part on the surface of the first adapter facing the first plastic part falls into the range of the opening; the orthographic projection of the first adapter on the second surface falls into the range of the second surface, along the first direction, the range of the distance L1 from the end part of the second adapter away from the first adapter to the end part of the first plastic body close to the second plastic part is as follows: the distance L2 between the end part of the first switching part, which is far away from the second switching part, and the end part of the first plastic body, which is far away from the second plastic part, is 3mm or more and L1 or less than 4 mm; l2 is more than or equal to 9mm and less than or equal to 11mm; the ratio of the width d3 of the first transfer portion along the first direction to the width L3 of the first plastic body along the first direction is in the range of: d3/L3 is more than or equal to 0.44 and less than or equal to 0.53; along the second direction, the range of the distance L4 from the end part of the second adapting part, which is away from the third adapting part, to the end part of the first plastic body is: l4 is more than or equal to 3.5mm and less than or equal to 4.5mm; along the second direction, the ratio of the distance L5 between the second adapting portion and the third adapting portion to the width L6 of the first plastic body along the second direction is in the range of: L5/L6 is more than or equal to 0.23 and less than or equal to 0.37.
Further, the end cover assembly further comprises a top cover and an explosion-proof valve, the top cover is arranged on one side, deviating from the electrode assembly, of the lower plastic part, the top cover is provided with two surfaces which are arranged in a back-to-back mode, the explosion-proof hole penetrates through the two surfaces of the top cover, the explosion-proof valve seals the explosion-proof hole, the second plastic part comprises a second plastic body and a fence part which are connected with each other, the fence part comprises a first connector part, a second connector part, a third connector part, a fourth connector part, a fifth connector part and a shielding part, the first connector part, the second connector part, the third connector part and the fourth connector part are sequentially arranged on the surface, facing the top cover, of the shielding part along a second direction at intervals, one ends of the first connector part, the second connector part, the third connector part and the fourth connector part are respectively connected with the end parts of the second plastic body, which are close to the end parts of the first plastic part, the first connector part, the second connector part, the third connector part and the other end parts are respectively provided with a fifth connector part, and the fifth connector part are provided with shielding holes, and the fifth connector part is provided with a vent hole; the shielding part and the second plastic body are enclosed to form a second side hole; the orthographic projection part of the shielding part on the surface of the top cover facing the electrode assembly falls into the range of the explosion-proof valve; the adapter piece is a second adapter piece, and the second adapter piece and the second plastic piece are oppositely arranged; the orthographic projection of the second adapter on the second surface falls into the range of the second surface, and along the first direction, the range of the distance L7 from the end part of the second adapter to the end part of the second plastic body, which is close to the first plastic part, is as follows: the range of the distance L8 from the end part of the first switching part far away from the second switching part to the end part of the second plastic body far away from the first plastic part is that the L7 mm is less than or equal to 8 mm: l8 is more than or equal to 8mm and less than or equal to 9mm; the ratio of the width d3 of the first transfer portion along the first direction to the width L9 of the second plastic body along the first direction is in the range of: d3/L9 is more than or equal to 0.44 and less than or equal to 0.53; along the second direction, the distance L10 between the end part of the second adapting part, which is away from the third adapting part, and the end part of the second plastic body is in the range of: l10 is more than or equal to 3mm and less than or equal to 4mm; along the second direction, the ratio of the distance L11 between the second adapting portion and the third adapting portion to the width L12 of the second plastic body along the second direction is in the range of: L11/L12 is more than or equal to 0.23 and less than or equal to 0.45.
Further, the energy storage device further comprises an insulating part, the insulating part surrounds the periphery of the electrode assembly, and the insulating part is connected with the first plastic body, the fence part and the second plastic body.
Further, along the direction perpendicular to the arrangement direction of the second switching portion and the third switching portion, the gap d4 between the first switching portion and the liquid running portion satisfies the following range: d4 is more than or equal to 0.5mm and less than or equal to 2.5mm.
Further, the number of the switching pieces is two, one switching piece is a first switching piece, the other switching piece is a second switching piece, the first switching piece and the second switching piece are arranged at intervals along the first direction, the material of the first switching piece is selected from aluminum, the material of the second switching piece is selected from copper, and the ratio of the thickness D2 of the second switching piece to the thickness D1 of the first switching piece meets the range: D2/D1 is more than or equal to 0.5 and less than 1.
Further, the thickness D1 of the first adapter member satisfies the range: d1 is more than or equal to 0.55mm and less than or equal to 0.85mm; the thickness D1 of the second adapter member satisfies the following range: d2 is more than or equal to 0.45mm and less than or equal to 0.85mm.
Further, the first plastic part comprises a first plastic body and a plurality of convex rib parts, the first plastic body is provided with the first surface, the second surface and the through holes, and the convex rib parts are arranged on the second surface at intervals and are arranged on the periphery of the first plastic body along the second direction; the second plastic part comprises a second plastic body and a plurality of convex rib parts, the second plastic body is provided with the first surface, the second surface and the through holes, and the convex rib parts are arranged on the second surface at intervals and are arranged on the periphery of the second plastic body along the second direction; the bead portion extends in the first direction.
Further, the energy storage device further comprises a first insulating film and a second insulating film, wherein the first insulating film is arranged on one side of the second switching part facing the lower plastic part and one side of the third switching part facing the lower plastic part; the electrode assembly comprises an electrode pole piece and a pole lug which are electrically connected, the second switching part and the third switching part are electrically connected with the pole lug, a first welding part is formed at the welding position of the second switching part and the pole lug, a first welding part is formed at the welding position of the third switching part and the pole lug, and the second insulating film is arranged on one side, deviating from the lower plastic part, of the first welding part.
Further, the energy storage device further comprises a third insulating film, a second welding part is formed at the welding position of the first transfer part and the flange part, the third insulating film is arranged on one side, deviating from the lower plastic part, of the second welding part, the thickness of the third insulating film is larger than that of the first insulating film, and the thickness of the third insulating film is larger than that of the second insulating film.
Further, the liquid feeding part comprises a shielding sub part and a plurality of connecting sub parts, wherein the plurality of connecting sub parts are arranged at intervals on the periphery of the shielding sub part, are respectively connected with the shielding sub part in a bending way, and two arbitrary adjacent connecting sub parts are enclosed into a liquid leakage hole; one end of each connecting sub-part, which is away from the shielding sub-part, is connected with the first plastic body, and the shielding sub-part is closer to the electrode assembly than the first plastic body.
Further, the liquid feeding part further comprises a bending sub-part, the bending sub-part is located between the shielding sub-part and the connecting sub-part and used for connecting the shielding sub-part and the connecting sub-part, the width of the plurality of connecting sub-parts is equal, and the width of the bending sub-part gradually decreases from one end connected with the connecting sub-part to one end connected with the shielding sub-part.
Further, the tab is welded to the adaptor, and a first welding part is formed at a welding position of the tab and the adaptor; the surface of the first weld facing away from the top cover is closer to the top cover than the surface of the shroud portion facing toward the top cover.
Further, the first plastic part further comprises a boss, wherein the boss is arranged on the second surface and is arranged on the periphery of the first plastic body far away from the second plastic part along the first direction; the second plastic part further comprises a boss, the boss is arranged on the second surface and is arranged on the periphery of the second plastic body, far away from the first plastic part, along the first direction, and the boss extends along the second direction; the surface of shielding sub-portion deviating from the first plastic body is closer to the first plastic body than the surface of boss deviating from the first plastic body.
The application also provides an electricity utilization system, which comprises: the energy storage device is used for supplying power to the electric equipment.
The present application also provides an energy storage system comprising: the energy storage device comprises a user load, a first electric energy conversion device, a second electric energy conversion device and an energy storage device provided by the application, wherein the first electric energy conversion device and the second electric energy conversion device are used for converting other forms of energy into electric energy, the first electric energy conversion device and the second electric energy conversion device are electrically connected with the user load, and the electric energy converted by the first electric energy conversion device and the electric energy converted by the second electric energy conversion device supply power for the user load; the energy storage device is respectively and electrically connected with the user load, the first electric energy conversion device and the second electric energy conversion device, the energy storage device stores electric energy converted by the first electric energy conversion device and the second electric energy conversion device, and the energy storage device supplies power for the user load.
In the energy storage device provided by the application, the end cover assembly, the adapter and the electrode assembly are sequentially arranged, and the adapter is respectively and electrically connected with the flange part and the electrode assembly. The flange part deviates from the surface of wearing portion with the second surface parallel and level, just the flange part deviates from wearing portion's surface electricity is connected the adaptor, the flange part need not occupy down the plastic part extremely the distance of electrode assembly, make the adaptor face the surface of end cover assembly supports and holds the second surface, is favorable to further increasing the electrode assembly extremely the distance of adaptor. When the adapter deviates from one side of the end cover assembly and is electrically connected with the electrode assembly, the lug of the electrode assembly is bent to be electrically connected with the adapter, and the distance from the electrode assembly to the adapter is large, so that the lug can be prevented from being excessively bent to break in the process of being electrically connected with the adapter, the service lives of the electrode assembly and the energy storage device are prolonged, and the production yield of the energy storage device is improved. In addition, the adaptor is the metalwork, the structural strength of adaptor is greater than the structural strength of lower plastic spare, will the adaptor towards the surface of end cover subassembly supports the second surface is favorable to improving the structural strength of lower plastic spare, avoids down plastic spare is because of dead weight or rotten and is sagged to the direction that is close to the electrode assembly after a period of use, thereby has improved energy memory's assembly yield.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present application;
FIG. 2 is a circuit block diagram of an energy storage system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an energy storage device according to an embodiment of the application;
FIG. 4 is a schematic diagram illustrating an exploded structure of an energy storage device according to an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a portion of an energy storage device according to an embodiment of the application;
FIG. 6 is a cross-sectional view of an energy storage device according to an embodiment of the present application taken along the direction A-A in FIG. 5;
FIG. 7 is a schematic view of a portion of an energy storage device according to another embodiment of the present application;
FIG. 8 is a schematic diagram of a partially exploded structure of an energy storage device according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a portion of an energy storage device according to another embodiment of the present application;
FIG. 10 is a schematic view of a portion of an energy storage device according to another embodiment of the present application;
FIG. 11 is a schematic diagram of a lower plastic part according to an embodiment of the application;
FIG. 12 is a schematic diagram illustrating an assembling relationship between a first plastic part and a first adapter according to an embodiment of the application;
FIG. 13 is a schematic structural view of a second plastic part according to an embodiment of the application;
FIG. 14 is a schematic diagram illustrating an assembling relationship between a second plastic member and a second adapter according to an embodiment of the application;
FIG. 15 is a schematic diagram of an energy storage device according to another embodiment of the present application;
FIG. 16 is an enlarged view of a lower plastic part along the dashed line B in FIG. 11 according to an embodiment of the present application;
FIG. 17 is a cross-sectional view of an energy storage device according to an embodiment of the present application taken along the direction C-C in FIG. 5;
FIG. 18 is a circuit block diagram of an electrical power utilization system according to an embodiment of the present application;
fig. 19 is a schematic structural diagram of an electrical power utilization system according to an embodiment of the application.
Reference numerals illustrate:
100-energy storage device, 110-end cap assembly, 111-lower plastic, 1111-first surface, 1112-second surface, 1113-through hole, 1114-first hole section, 1115-second hole section, 1116-liquid feeding portion, 1117-first plastic body, 1118-bead portion, 1119-shielding sub portion, 1121-connector portion, 1122-liquid leakage hole, 1123-bent sub portion, 1124-boss, 1125-first plastic, 1126-second plastic, 11261-shielding portion, 11262-first connector portion, 11263-second connector portion, 11264-third connector portion, 11265-fourth connector portion, 11266-fifth connector portion, 11267-vent, 11268-first side hole, 11269-second side hole, 1128-second plastic body, 1129-fence portion, 113-post, 1131-penetrating portion, 1132-flange portion, 1133-positive post, 1134-negative post, 120-adapter, 121-first adapter, 1211-second weld, 122-second adapter, 1222-first weld, 123-third adapter, 124-first adapter, 125-opening, 126-second adapter, 140-electrode assembly, 141-electrode pole piece, 142-tab, 150-first insulating film, 160-second insulating film, 170-third insulating film, 180-top cap, 181-penetrating hole, 182-pouring hole, 183-explosion-proof valve, 184-explosion-proof hole, 190-sealing nail, 210-housing, 211-accommodation groove, 220-insulating film, 300-electricity utilization system, 310-electricity utilization equipment, 400-energy storage system, 410-user load, 420-first electric energy conversion device, 430-second electric energy conversion device.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" or "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. As is well known, to achieve the great goal of carbon neutralization, the main approach to green electric energy generation is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.
Taking electrochemical energy storage as an example, the scheme provides an energy storage device, wherein a group of electrode assemblies are arranged in the energy storage device, chemical elements in the electrode assemblies are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.
The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as (wind and light) power generation side energy storage, electric network side energy storage, base station side energy storage and user side energy storage, the types of corresponding energy storage devices include:
(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;
(2) The small and medium energy storage electric cabinet is applied to industrial and commercial energy storage scenes (banks, markets and the like) at the user side, and the main operation mode is peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an energy storage system 400 according to an embodiment of the application, and the embodiment of fig. 1 is illustrated by taking a user energy storage scenario as an example, and the energy storage device 100 of the application is not limited to the user energy storage scenario.
The present application also provides an energy storage system 400, the energy storage system 400 comprising: the first electric energy conversion device 420 and the second electric energy conversion device 430 are used for converting other forms of energy into electric energy, the first electric energy conversion device 420 and the second electric energy conversion device 430 are electrically connected with the user load 410, and the electric energy converted by the first electric energy conversion device 420 and the electric energy converted by the second electric energy conversion device 430 supply power for the user load 410; the energy storage device 100 is electrically connected to the user load 410, the first power conversion device 420 and the second power conversion device 430, respectively, the energy storage device 100 stores the power converted by the first power conversion device 420 and the second power conversion device 430, and the energy storage device 100 supplies power to the user load 410.
Optionally, the first electric energy conversion device 420 and the second electric energy conversion device 430 can convert at least one of solar energy, optical energy, wind energy, thermal energy, tidal energy, biomass energy, mechanical energy, etc. into electric energy to provide a stable power source for the user load 410 and the energy storage device 100.
It will be appreciated that in the fig. 1 embodiment of the present application, the consumer load 410 may be, but is not limited to being, a base station, a business side, etc., the first power conversion device 420 is a photovoltaic panel that can convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 100 is used to store the electrical energy and supply the electrical energy to the base station and business side for use during peak electricity prices, or to supply the electrical power during grid outage/outage. The second power conversion device 430 is a windmill that converts wind energy into power and supplies the power to at least one of the user load 410 and the energy storage device 100. The energy storage device 100 is used to store the electric energy and supply the electric energy to street lamps and household appliances for use at the time of peak electricity prices or supply the electric energy at the time of power failure/power outage of the electric network. The transmission of the electric energy can be performed by adopting a high-voltage cable.
The number of the energy storage devices 100 may be plural, and the plurality of energy storage devices 100 may be connected in series or parallel, and the plurality of energy storage devices 100 may be supported by a separator (not shown) and electrically connected. In the present embodiment, "a plurality of" means two or more. The energy storage device 100 may further be provided with an energy storage box for accommodating the energy storage device 100.
Alternatively, the energy storage device 100 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, and the like. The practical application form of the energy storage device 100 provided in the embodiment of the present application may be, but is not limited to, the listed products, and may be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 100. The embodiment of the present application will be described by taking the energy storage device 100 as a multi-core battery. When the energy storage device 100 is a single battery, the energy storage device 100 may be at least one of a cylindrical battery, a prismatic battery, and the like.
Referring to fig. 3 to 6, the present application provides an energy storage device 100, the energy storage device 100 includes an end cap assembly 110, an adapter 120 and an electrode assembly 140, the end cap assembly 110 includes a lower plastic member 111 and a pole 113, the lower plastic member 111 has a first surface 1111 and a second surface 1112 disposed opposite to each other, the lower plastic member 111 further has a through hole 1113 penetrating the first surface 1111 and the second surface 1112, the through hole 1113 includes a first hole section 1114 and a second hole section 1115 which are communicated, a radial dimension of the first hole section 1114 is smaller than a radial dimension of the second hole section 1115, and the second hole section 1115 is closer to the second surface 1112 than the first hole section 1114; the pole 113 includes a penetrating portion 1131 and a flange portion 1132, the penetrating portion 1131 is convexly disposed on the flange portion 1132, the penetrating portion 1131 is disposed on the first hole section 1114, the flange portion 1132 is disposed on the second hole section 1115, and a surface of the flange portion 1132 facing away from the penetrating portion 1131 is flush with the second surface 1112; the adaptor 120 is disposed on a side of the flange portion 1132 facing away from the lower plastic component 111, the adaptor 120 is electrically connected to the flange portion 1132, and a surface of the adaptor 120 facing the end cover assembly 110 abuts against the second surface 1112; the electrode assembly 140 is disposed on a side of the adaptor 120 facing away from the end cap assembly 110, the electrode assembly 140 includes an electrode tab 141 and a tab 142 that are electrically connected, and the tab 142 of the electrode assembly 140 is electrically connected to the adaptor 120.
As can be appreciated, the lower plastic member 111 has a first surface 1111 and a second surface 1112 disposed opposite to each other, and the second surface 1112 is closer to the electrode assembly 140 than the first surface 1111.
It will be appreciated that the radial dimension of the first bore section 1114 is smaller than the radial dimension of the second bore section 1115, and that the equivalent circular diameter of the cross section of the first bore section 1114 may be smaller than the equivalent circular diameter of the cross section of the second bore section 1115.
Alternatively, the first hole section 1114 may be shaped as a round hole, a square hole, an irregularly shaped hole, or the like; the second hole section 1115 may be a round hole, a square hole, an irregularly shaped hole, or the like. The present application uses the first hole section 1114 as a round hole and the second hole section 1115 as a square hole, but should not be construed as limiting the shape of the first hole section 1114 and the shape of the second hole section 1115.
It may be appreciated that the first hole section 1114 and the second hole section 1115 are communicated, and the second hole section 1115 is closer to the second surface 1112 than the first hole section 1114, the first hole section 1114 and the second hole section 1115 may be stepped holes, the penetrating portion 1131 is disposed in the first hole section 1114, and the flange portion 1132 is disposed in the second hole section 1115.
It may be appreciated that the penetrating portion 1131 is protruding on the flange portion 1132, and the penetrating portion 1131 and the flange portion 1132 may be sequentially disposed, and the flange portion 1132 may protrude from the outer periphery of the penetrating portion 1131 along a direction perpendicular to the arrangement direction of the penetrating portion 1131 and the flange portion 1132.
It will be appreciated that the surface of the flange portion 1132 facing away from the penetrating portion 1131 is flush with the second surface 1112, that is, the surface of the flange portion 1132 facing away from the penetrating portion 1131 is coplanar with the second surface 1112, that is, the surface of the flange portion 1132 facing away from the penetrating portion 1131 is in the same plane as the second surface 1112.
It may be appreciated that the adaptor 120 is electrically connected to the flange 1132, and the tab 142 is electrically connected to the adaptor 120, and two opposite ends of the adaptor 120 may be electrically connected to the flange 1132 and the tab 142, respectively.
It may be appreciated that the surface of the adaptor 120 facing the end cap assembly 110 abuts against the second surface 1112, that is, the surface of the adaptor 120 facing the end cap assembly 110 is disposed in a fitting manner with the second surface 1112, and that the surface of the adaptor 120 facing the end cap assembly 110 is disposed in a fitting manner with the surface of the flange portion 1132 facing away from the penetrating portion 1131 and is welded to achieve electrical connection.
As can be appreciated, opposite ends of the tab 142 are electrically connected to the electrode assembly 140 and the tab 142, respectively.
In the embodiment of the application, the end cap assembly 110, the adaptor 120 and the electrode assembly 140 are sequentially arranged, and the adaptor 120 is electrically connected to the flange 1132 and the tab 142, respectively. The surface of the flange portion 1132 facing away from the penetrating portion 1131 is flush with the second surface 1112, and the surface of the flange portion 1132 facing away from the penetrating portion 1131 is electrically connected with the adaptor 120, the distance from the lower plastic part 111 to the electrode assembly 140 does not need to be occupied by the flange portion 1132, so that the surface of the adaptor 120 facing the end cover assembly 110 abuts against the second surface 1112, which is beneficial to further increasing the distance from the electrode assembly 140 to the adaptor 120. When the adapter 120 is electrically connected to the electrode assembly 140 at a side facing away from the end cap assembly 110, the tab 142 of the electrode assembly 140 is bent to electrically connect with the adapter 120, so that the distance from the electrode assembly 140 to the adapter 120 is larger, and the tab 142 is prevented from being excessively bent to break during the electrical connection with the adapter 120, which is beneficial to prolonging the service lives of the electrode assembly 140 and the energy storage device 100 and improving the production yield of the energy storage device 100. In addition, the adaptor 120 is a metal piece, the structural strength of the adaptor 120 is greater than that of the lower plastic piece 111, and the surface of the adaptor 120 facing the end cover assembly 110 abuts against the second surface 1112, which is favorable for improving the structural strength of the lower plastic piece 111, and preventing the lower plastic piece 111 from sagging in a direction close to the electrode assembly 140 due to dead weight or deterioration after a period of use, thereby improving the assembly yield of the energy storage device 100.
Referring to fig. 3 to 9, in some embodiments, the adaptor 120 includes a first adaptor 121, a second adaptor 122 and a third adaptor 123, where the second adaptor 122 and the third adaptor 123 are disposed on the same side of the first adaptor 121 along a first direction (as shown by X in fig. 9) at intervals, and are electrically connected to the first adaptor 121 respectively; the second switching portion 122 and the third switching portion 123 are disposed at intervals along a second direction (as shown by Y in fig. 9), the first switching portion 121 is electrically connected to the flange portion 1132, the second switching portion 122 and the third switching portion 123 are electrically connected to one end of the tab 142 of the electrode assembly 140, wherein the first direction intersects with the second direction, the first direction is a length direction of the end cap assembly 110, and the second direction is a width direction of the end cap assembly 110.
In this embodiment, the second transfer portion 122 and the third transfer portion 123 are disposed at the same side of the first transfer portion 121 along the first direction at intervals, and are respectively connected to the first transfer portion 121, and the second transfer portion 122 and the third transfer portion 123 are disposed at intervals along the second direction, so that the second transfer portion 122, the first transfer portion 121 and the third transfer portion 123 are connected to form a flat plate structure similar to a "C". The first adaptor 121 is configured to electrically connect to the flange 1132, and the second adaptor 122 and the third adaptor 123 are configured to electrically connect to one end of the tab 142 of the electrode assembly 140, so as to electrically connect to the electrode assembly 140 and the post 113, respectively. The "C" shaped plate mechanism is beneficial to saving the preparation material of the adaptor 120, thereby saving the manufacturing cost of the adaptor 120; in addition, the second adapter portion 122 and the third adapter portion 123 are disposed at intervals, and compared with the structure in which the second adapter portion 122 and the third adapter portion 123 are directly connected, the solution of the present application is beneficial to reducing the weight of the adapter 120, and avoiding the stability of the electrical connection with the flange portion 1132 from being affected due to the overweight of the adapter 120.
Optionally, in some embodiments, the first adaptor portion 121 is electrically connected to the flange portion 1132 by welding, the second adaptor portion 122 is electrically connected to the adaptor 120 by welding, and the third adaptor portion 123 is electrically connected to the adaptor 120 by welding.
Optionally, in some embodiments, the number of the lower plastic parts 111 is two, and the two lower plastic parts 111 are respectively formed and then are disposed at a distance from one side of the adaptor 120 facing away from the electrode assembly 140; in other embodiments, the number of the lower plastic parts 111 is one, the lower plastic parts 111 are in an integrally formed structure, and the lower plastic parts 111 are disposed on one side of the adaptor 120 facing away from the electrode assembly 140.
Optionally, in some embodiments, when the number of the lower plastic parts 111 is two, the lower plastic parts 111 are a first plastic part 1125 and a second plastic part 1126, and the first plastic part 1125 and the second plastic part 1126 are disposed at intervals along the first direction.
Optionally, in some embodiments, the end cap assembly 110 further includes a top cap 180 and an explosion-proof valve 183, the top cap 180 is disposed on a side of the lower plastic member 111 facing away from the electrode assembly 140, the top cap 180 has two surfaces disposed opposite to each other, the top cap 180 has a through hole 181 and an explosion-proof hole 184, the pole 113 is inserted through the through hole 181, and the explosion-proof valve 183 closes the explosion-proof hole 184.
In this embodiment, the top cover 180, the lower plastic part 111 and the adaptor 120 are sequentially disposed, the pole 113 sequentially penetrates through the lower plastic part 111 and the top cover 180, and the surface of the flange portion 1132 facing away from the penetrating portion 1131 is flush with the second surface 1112. The top cover 180 can play a role in dust prevention and protection for the adaptor 120, the electrode assembly 140, etc., and is beneficial to improving the stability of the energy storage device 100. In addition, the end cap assembly 110 further includes an explosion-proof valve 183, so that when the end cap assembly 110 is assembled in the energy storage device 100 and the pressure inside the energy storage device 100 is greater than a certain value, gas can be flushed out in time through the explosion-proof valve 183, so as to avoid explosion of the energy storage device 100, and improve the safety performance of the energy storage device 100.
Optionally, in some embodiments, the energy storage device 100 further includes a housing 210 and an electrolyte (not shown), the housing 210 is disposed on a side of the end cap assembly 110 facing the adapter 120, the electrolyte is used to infiltrate the electrode assembly 140, the housing 210 is connected to the end cap assembly 110 and encloses a receiving groove 211 with the end cap assembly 110, and the receiving groove 211 is used to receive the electrode assembly 140, the electrolyte and the adapter 120.
Optionally, in some embodiments, the top cover 180 has a filling hole 182, and the filling hole 182 penetrates through the top cover 180 to fill the energy storage device 100 with electrolyte, and the energy storage device 100 further includes a sealing glue pin 190, where the sealing glue pin 190 is used to seal the filling hole 182 when filling is completed. The sealant nails 190 can prevent the electrolyte from being polluted by moisture and oxygen in the air, so as to reduce the infiltration effect of the electrolyte on the electrode assembly 140, and in addition, the sealant nails 190 can prevent the chips in the preparation process from falling into the energy storage device 100 to cause the short circuit of the energy storage device 100, thereby being beneficial to improving the safety performance of the energy storage device 100.
Referring to fig. 3 to 11, optionally, in some embodiments, the first plastic 1125 includes a first plastic body 1117 and a liquid-feeding portion 1116, the first plastic body 1117 has the first surface 1111, the second surface 1112 and the through hole 1113, and the orthographic projection of the liquid-feeding portion 1116 on the second surface 1112 at least partially overlaps with the orthographic projection of the liquid-filling hole 182 on the second surface 1112.
In this embodiment, the liquid-feeding portion 1116 is disposed opposite to the liquid-feeding hole 182, and when the electrolyte is injected into the liquid-feeding hole 182, the electrolyte impacts the liquid-feeding portion 1116 and flows along the liquid-feeding portion 1116 to the electrode assembly 140 side, so as to infiltrate the electrode assembly 140. The liquid-feeding portion 1116 can prevent the electrolyte from directly impacting the electrode assembly 140 to drop the active material in the electrode assembly 140, and can prevent the tab 142 from being directly connected with the electrode plate 141 in a short circuit manner during the impact process, thereby being beneficial to improving the safety performance of the energy storage device 100. Furthermore, the liquid-feeding portion 1116 can prevent the electrode assembly 140 from directly pressing the sealant nails 190 to crack the top cover 180, which is beneficial to prolonging the service life of the energy storage device 100.
It can be appreciated that the electrode post 113 may be a positive electrode post 1133 or a negative electrode post 1134, and when the energy storage device 100 includes the positive electrode post 1133 and the negative electrode post 1134, the positive electrode post 1133 and the negative electrode post 1134 are disposed at intervals.
In some embodiments, the pole 113 is a positive pole 1133, the adaptor 120 is a first adaptor 124, the first adaptor 124 is a positive adaptor, the first adaptor 124 is disposed opposite to the first plastic 1125, the first adaptor portion 121, the second adaptor portion 122, and the third adaptor portion 123 of the first adaptor 124 enclose an opening 125, and an orthographic projection of the liquid-feeding portion 1116 of the first plastic 1125 on a surface of the first adaptor 124 facing the first plastic 1125 falls within a range of the opening 125.
In this embodiment, when the electrode post 113 is a positive electrode post 1133, the adaptor 120 is the first adaptor 124, in other words, the positive electrode post 1133 is disposed opposite to the first adaptor 124. In addition, the first adaptor 124 is disposed opposite to the first plastic part 1125, and the first adaptor portion 121, the second adaptor portion 122, and the third adaptor portion 123 of the first adaptor 124 enclose an opening 125, so as to avoid the liquid-running portion 1116 of the first plastic part 1125, so that when the electrolyte is injected into the liquid-injecting hole 182, the electrolyte is prevented from directly splashing between the first adaptor 124 and the first plastic part 1125 when the electrolyte is impacted to the liquid-running portion 1116 and splashed to the side, thereby improving the structural stability of the bonding arrangement between the first adaptor 124 and the first plastic part 1125. Further, the liquid-feeding portion 1116 can prevent the electrolyte from directly impacting the same region of the electrode assembly 140 and uniformly disperse the electrolyte to different regions of the electrode assembly 140, which is beneficial to improving the liquid-filling uniformity of the electrolyte.
In some embodiments, along the arrangement direction of the second adapting portion 122 and the third adapting portion 123, the width d1 of the second adapting portion 122 satisfies the range: d1 is more than or equal to 18.18mm and less than or equal to 22.88mm. Specifically, the width d1 of the second adapter 122 may be, but is not limited to, 18.18mm, 18.38mm, 18.5mm, 18.67mm, 18.9mm, 19.18mm, 19.33mm, 19.45mm, 19.78mm, 20.04mm, 20.45mm, 20.66mm, 20.78mm, 21.25mm, 21.66mm, 21.78mm, 22.04mm, 22.38mm, 22.88mm, etc. In other words, along the second direction, the width d1 of the second adapting portion 122 satisfies the range: d1 is more than or equal to 18.18mm and less than or equal to 22.88mm.
In this embodiment, when the value of the width d1 of the second switching part 122 satisfies the range of 18.18 mm.ltoreq.d1.ltoreq.22.88 mm, the width d1 of the second switching part 122 is within a reasonable range, the second switching part 122 has a sufficiently large area to be electrically connected with the electrode assembly 140, and the stability of the electrical connection between the switching part 120 and the electrode assembly 140 is improved. In addition, after the lower plastic part 111 is used for a period of time, the lower plastic part 111 is easy to deteriorate to reduce the strength, and the surface of the second adapting part 122 facing the end cover assembly 110 abuts against the second surface 1112, which is favorable for improving the structural strength of the lower plastic part 111, so as to avoid sagging of the lower plastic part 111 due to self deterioration or gravity, and is favorable for tightly abutting the surface of the lower plastic part 111 facing away from the electrode assembly 140 against the surface of the top cover 180 facing the electrode assembly 140, thereby improving the assembly yield of the energy storage device 100; it is also advantageous to reduce the occupation of the space between the top cap 180 and the electrode assembly 140 to assemble more electrode assemblies 140, and to increase the energy density per unit volume of the energy storage device 100. Furthermore, when the number of the lower plastic parts is two, the second adapting portion 122 is disposed at a portion of the first plastic part 1125, which is close to the second plastic part 1126, so that the structural strength of a portion of the first plastic part 1125, which is close to the second plastic part 1126, is enhanced, sagging of a portion of the first plastic part 1125, which is close to the second plastic part 1126, due to gravity is avoided, thereby avoiding increasing the interval between the first plastic part 1125 and the second plastic part 1126 in the thickness direction, preventing foreign matters from passing through the interval between the first plastic part 1125 and the second plastic part 1126 and attaching to the explosion-proof valve 183, avoiding affecting normal opening of the explosion-proof valve 183, and improving the safety performance of the energy storage device 100. When the width d1 of the second adapting portion 122 is greater than 22.88mm, the width of the second adapting portion 122 is too large, which increases the weight of the second adapting portion 122, and the second adapting portion 122 is easy to sag due to gravity after being welded to the electrode assembly 140, so that the electrical connection stability of the second adapting portion 122 and the electrode assembly 140 is affected. In addition, the manufacturing cost of the adaptor 120 is also increased. Moreover, if the width of the second adapting portion 122 is too large, the liquid running portion 1116 is easily blocked, or the gap between the second adapting portion 122 and the liquid running portion 1116 is too small, so that the electrolyte is easy to impact the liquid running portion 1116 and splash to the side between the adapting piece 120 and the lower plastic piece 111, and the stability of the electrical connection between the adapting piece 120 and the lower plastic piece 111 is reduced. When the value of the width d1 of the second switching part 122 is smaller than 22.88mm, the width of the second switching part 122 is too small, so that the welding area of the second switching part 122 and the electrode assembly 140 is too small, and the stability of the electrical connection between the second switching part 122 and the electrode assembly 140 is reduced. In addition, the area of the second adapting portion 122 is reduced, so that the area of the surface of the second adapting portion 122, which abuts against the lower plastic part 111 and faces the electrode assembly 140, is reduced, which is not beneficial to improving the structural strength of the lower plastic part 111, and reducing the service life of the lower plastic part 111.
Along the arrangement direction of the second adapting portion 122 and the third adapting portion 123, the width d2 of the third adapting portion 123 satisfies the following range: d2 is more than or equal to 18.18mm and less than or equal to 22.88mm. Specifically, the width d2 of the third adapter 123 may be, but is not limited to, 18.18mm, 18.38mm, 18.5mm, 18.67mm, 18.9mm, 19.18mm, 19.33mm, 19.45mm, 19.78mm, 20.04mm, 20.45mm, 20.66mm, 20.78mm, 21.25mm, 21.66mm, 21.78mm, 22.04mm, 22.38mm, 22.88mm, etc. In other words, the width d2 of the third transferring portion 123 in the second direction satisfies the range: d2 is more than or equal to 18.18mm and less than or equal to 22.88mm.
In this embodiment, when the value of the width d2 of the third switching part 123 satisfies the range of 18.18 mm.ltoreq.d2.ltoreq.22.88 mm, the width d2 of the third switching part 123 is within a reasonable range, and the third switching part 123 has a sufficiently large area to be electrically connected with the electrode assembly 140, so as to improve the stability of the electrical connection between the switching part 120 and the electrode assembly 140. In addition, the surface of the third adapting portion 123 facing the end cover assembly 110 abuts against the second surface 1112, which is favorable for improving the structural strength of the lower plastic part 111, so as to avoid sagging of the lower plastic part 111 due to self deterioration or gravity, and is favorable for tightly abutting the surface of the lower plastic part 111 facing away from the electrode assembly 140 against the surface of the top cover 180 facing the electrode assembly 140, so as to improve the assembly yield of the energy storage device 100; it is also advantageous to reduce the occupation of the space between the top cap 180 and the electrode assembly 140 to assemble more electrode assemblies 140, and to increase the energy density per unit volume of the energy storage device 100. Furthermore, when the number of the lower plastic parts is two, the third adapter 123 is disposed at the portion of the first plastic part 1125 near the second plastic part 1126, so as to strengthen the structural strength of the portion of the first plastic part 1125 near the second plastic part 1126, and avoid sagging of the portion of the first plastic part 1125 near the second plastic part 1126 due to gravity, thereby avoiding increasing the interval between the first plastic part 1125 and the second plastic part 1126 in the thickness direction, preventing foreign matters from passing through the distance between the first plastic part 1125 and the second plastic part 1126 and attaching to the anti-explosion valve 183, avoiding affecting the normal opening of the anti-explosion valve 183, and improving the safety performance of the energy storage device 100. When the width d2 of the third transfer portion 123 is greater than 22.88mm, the width of the third transfer portion 123 is too large, which increases the weight of the third transfer portion 123, and the third transfer portion 123 is easily sagged due to gravity after being welded to the electrode assembly 140, so that the electrical connection stability of the third transfer portion 123 and the electrode assembly 140 is affected. In addition, the manufacturing cost of the adaptor 120 is also increased. Moreover, if the width of the third transfer portion 123 is too large, the liquid running portion 1116 is easily blocked, or the gap between the third transfer portion 123 and the liquid running portion 1116 is too small, so that the electrolyte is easy to impact the liquid running portion 1116 and splash to the side between the transfer member 120 and the lower plastic member 111, thereby reducing the stability of the electrical connection between the transfer member 120 and the lower plastic member 111. When the value of the width d2 of the third switching part 123 is smaller than 22.88mm, the width of the third switching part 123 is too small, so that the welding area of the third switching part 123 and the electrode assembly 140 is too small, and the stability of the electrical connection between the third switching part 123 and the electrode assembly 140 is reduced. In addition, the area of the third adapting portion 123 is reduced, so that the area of the surface of the third adapting portion 123, which abuts against the lower plastic part 111 and faces the electrode assembly 140, is reduced, which is not beneficial to improving the structural strength of the lower plastic part 111, and reducing the service life of the lower plastic part 111.
In some embodiments, the width d3 of the first transfer portion 121 in the direction perpendicular to the arrangement direction of the second transfer portion 122 and the third transfer portion 123 satisfies the range: d3 is more than or equal to 33mm and less than or equal to 37mm. Specifically, the width d3 of the first transfer portion 121 may have a value of, but is not limited to, 33mm, 33.2mm, 33.4mm, 33.8mm, 34mm, 34.2mm, 34.5mm, 34.6mm, 35mm, 35.2mm, 35.6mm, 35.8mm, 36.2mm, 36.4mm, 36.5mm, 36.7mm, 36.9mm, 37mm, and the like. In other words, along the first direction, the width d3 of the first adapting portion 121 satisfies the range: d3 is more than or equal to 33mm and less than or equal to 37mm.
In this embodiment, when the width of the first transfer portion 121 satisfies the range 33mm < d3 > and < 37mm, the width of the first transfer portion 121 is within a reasonable range, and the first transfer portion 121 has a large enough area to be welded with the flange portion 1132 to achieve electrical connection, so as to improve the electrical connection stability of the transfer member 120 and the electrode assembly 140. In addition, the surface of the first transfer portion 121 facing the end cover assembly 110 abuts against the second surface 1112, which is favorable for improving the structural strength of the lower plastic part 111, so as to avoid sagging of the lower plastic part 111 due to self deterioration or gravity, and is favorable for tightly abutting the surface of the lower plastic part 111 facing away from the electrode assembly 140 against the surface of the top cover 180 facing the electrode assembly 140, so as to improve the assembly yield of the energy storage device 100; it is also advantageous to reduce the occupation of the space between the top cap 180 and the electrode assembly 140 to assemble more electrode assemblies 140, and to increase the energy density per unit volume of the energy storage device 100. When the width of the first transfer portion 121 is greater than 37mm, the width of the first transfer portion 121 is too large, the first transfer portion 121 may easily shield the liquid running portion 1116, or the gap between the third transfer portion 123 and the liquid running portion 1116 may be too small, so that the electrolyte may easily impact the liquid running portion 1116 and splash to the side between the transfer member 120 and the lower plastic member 111, thereby reducing the electrical connection stability between the transfer member 120 and the flange portion 1132. In addition, the width of the first transfer portion 121 is too large, which increases the weight of the first transfer portion 121, and the first transfer portion 121 may easily sag due to gravity after being welded to the flange portion 1132, so that the electrical connection stability of the first transfer portion 121 and the flange portion 1132 is affected. Furthermore, the manufacturing cost of the adaptor 120 is also increased. When the width of the first transfer portion 121 is smaller than 33mm, the width of the first transfer portion 121 is too small, so that the area of the surface of the first transfer portion 121, which abuts against the lower plastic member 111 and faces the electrode assembly 140, is reduced, which is not beneficial to improving the structural strength of the lower plastic member 111 and reducing the service life of the lower plastic member 111.
Referring to fig. 3 to 12, in some embodiments, the front projection of the first adaptor 124 on the second surface 1112 falls within the range of the second surface 1112, and along the first direction, a distance L1 between an end of the second adaptor 122 facing away from the first adaptor 121 and an end of the first plastic body 1117 near the second plastic 1126 is in a range of: 3mm < L1 < 4mm, the range of the distance L2 from the end of the first adapter part 121 far from the second adapter part 122 to the end of the first plastic body 1117 far from the second plastic piece 1126 is; l2 is more than or equal to 9mm and less than or equal to 11mm; the ratio of the width d3 of the first adapting portion 121 along the first direction to the width L3 of the first plastic body 1117 along the first direction is in the range of: d3/L3 is more than or equal to 0.44 and less than or equal to 0.53; along the second direction, the distance L4 between the end of the second adapting portion 122 facing away from the third adapting portion 123 and the end of the first plastic body 1117 is in the range of: l4 is more than or equal to 3.5mm and less than or equal to 4.5mm; along the second direction, the ratio of the distance L5 between the second adapting portion 122 and the third adapting portion 123 to the width L6 of the first plastic body 1117 along the second direction is in the range of: L5/L6 is more than or equal to 0.23 and less than or equal to 0.37.
In this embodiment, when the front projection of the first adaptor 124 on the second surface 1112 falls within the range of the second surface 1112, the first plastic member 1125 protrudes from the first adaptor 124, and along the first direction, the energy storage device 100 satisfies the relationship: the distance from the opposite two ends of the first adapter 124 to the opposite two ends of the first plastic 1125 is within a reasonable range, so that the first adapter 124 cannot protrude from the first plastic 1125, and the first adapter 124 is large enough to be attached to the surface of the first plastic 1125 facing the electrode assembly 140 to the greatest extent, thereby being beneficial to improving the structural stability of the attachment arrangement of the first adapter 124 and the first plastic 1125 and the structural strength of the first plastic 1125. In the second direction, the energy storage device 100 satisfies the relationship: 3.5mm is less than or equal to L4 is less than or equal to 4.5mm, then the second transfer portion 122 deviates from the tip of third transfer portion 123 to the distance between the tip of first plastic body 1117 is in reasonable within range, makes first adaptor 124 can not bulge in first plastic 1125, just first adaptor 124 is big enough, can the at utmost laminate set up in first plastic 1125 is towards electrode assembly 140's surface, then is favorable to improving first adaptor 124 with first plastic 1125 laminate the structural stability who sets up, still is favorable to improving first plastic 1125's structural strength. Further, the ratio of the width d3 of the first transfer portion 121 along the first direction to the width L3 of the first plastic body 1117 along the first direction satisfies the following range: the ratio of the distance L5 between the second adapting portion 122 and the third adapting portion 123 to the width L6 of the first plastic body 1117 along the second direction satisfies the range: when L5/L6 is greater than or equal to 0.23 and less than or equal to 0.37, so that when the first adapter 124 and the first plastic 1125 are matched, the first adapter 121 can avoid the liquid outlet 1116 of the first plastic 1125, and when electrolyte is injected into the liquid injection hole 182, the electrolyte can be prevented from directly splashing between the first adapter 124 and the first plastic 1125 when the electrolyte impacts the liquid outlet 1116 and splashes to the side, thereby improving the structural stability of the joint arrangement between the first adapter 124 and the first plastic 1125; in addition, the width of the first adapting portion 121 along the first direction, and the distance between the second adapting portion 122 and the third adapting portion 123 are all within a reasonable range, so that the first adapting member 124 has a sufficiently large surface, and can be attached to the surface of the first plastic member 1125 facing the electrode assembly 140 to a relatively large extent, thereby improving the structural strength of the end cap assembly along the first direction and the second direction.
Specifically, the distance L1 between the end of the second adapter 122 facing away from the first adapter 121 and the end of the first plastic body 1117 near the second plastic 1126 may have a value of, but is not limited to, 3mm, 3.05mm, 3.12mm, 3.18mm, 3.25mm, 3.3mm, 3.34mm, 3.45mm, 3.55mm, 3.6mm, 3.77mm, 3.8mm, 3.85mm, 3.9mm, 3.95mm, 4mm, etc.
Specifically, the distance L2 between the end of the first adapter 121 distal from the second adapter 122 to the end of the first plastic body 1117 distal from the second plastic 1126 may have a value of, but is not limited to, 9mm, 9.04mm, 9.15mm, 9.22mm, 9.34mm, 9.42mm, 9.56mm, 9.77mm, 9.8mm, 9.95mm, 10mm, 10.05mm, 10.2mm, 10.34mm, 10.45mm, 10.5mm, 10.55mm, 10.67mm, 10.75mm, 10.84mm, 10.9mm, 11mm, and the like.
Specifically, the ratio of the width d3 of the first transfer portion 121 along the first direction to the width L3 of the first plastic body 1117 along the first direction may be, but is not limited to, 0.44, 0.445, 0.45, 0.455, 0.46, 0.465, 0.47, 0.475, 0.48, 0.485, 0.49, 0.495, 0.5, 0.505, 0.51, 0.52, 0.53, etc.
Specifically, in the second direction, the distance L4 between the end of the second adapter 122 facing away from the third adapter 123 to the end of the first plastic body 1117 may have a value of, but is not limited to, 3.5mm, 3.55mm, 3.6mm, 3.62mm, 3.67mm, 3.7mm, 3.75mm, 3.85mm, 3.9mm, 4.05mm, 4.15mm, 4.22mm, 4.34mm, 4.45mm, and 4.5mm.
Specifically, the ratio of the distance L5 between the second adapting portion 122 and the third adapting portion 123 along the second direction to the width L6 of the first plastic body 1117 along the second direction may be, but is not limited to, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, etc.
Optionally, along the second direction, a distance L5 between the second adapting portion 122 and the third adapting portion 123 ranges from: 15 mm.ltoreq.L5.ltoreq.20 mm, specifically, the distance L5 between the second adapter portion 122 and the third adapter portion 123 may have values of, but not limited to, 15mm, 15.2mm, 15.9mm, 16mm, 16.2mm, 16.4mm, 16.9mm, 17.5mm, 17.9mm, 18.2mm, 18.7mm, 18.9mm, 19.2mm, 19.8mm, 20mm, and the like.
Referring to fig. 3 to 11, 13 and 14, optionally, in some embodiments, the second plastic member 1126 includes a second plastic body 1128 and a fence portion 1129 connected to each other, the fence portion 1129 includes a first connector portion 11262, a second connector portion 11263, a third connector portion 11264, a fourth connector portion 11265, a fifth connector portion 11266 and a shielding portion 11261, the first connector portion 11262, the second connector portion 11263, the third connector portion 11264 and the fourth connector portion 11265 are sequentially disposed on a surface of the shielding portion 11261 facing the top cover 180 at intervals along a second direction, one end of the first connector portion 11262, the second connector portion 11263, the third connector portion 11264 and the fourth connector portion 11265 are respectively connected to ends of the second plastic body 1128 close to the first member 1125, the other ends of the first connector portion 11262, the second connector portion 11263, the third connector portion 11264 and the fourth connector portion 11265 are respectively surrounded by the fifth connector portion 11266 and the fifth connector portion 3561, and the other end of the fifth connector portion 11292 are respectively provided with a vent hole 3561; the shielding part 11261 and the second plastic body 1128 are enclosed to form a second side hole 11269; a front projection portion of the shielding portion 11261 on a surface of the top cover 180 facing the electrode assembly 140 falls within the range of the explosion-proof valve 183; the adaptor 120 is a second adaptor 126, and the second adaptor 126 is disposed opposite to the second plastic 1126.
It will be appreciated that the fence portion 1129 is disposed closer to the first plastic piece 1125 than the second plastic body 1128.
In this embodiment, the orthographic projection portion of the shielding portion 11261 on the surface of the top cover 180 facing the electrode assembly 140 falls within the range of the explosion-proof valve 183, so that it is avoided that part of metal chips or broken tabs 142 in the energy storage device 100 directly float to the explosion-proof valve 183 from the side of the second lower plastic part close to the electrode assembly 140, and the explosion-proof valve 183 is prevented from being opened in advance, so that the reliability of the explosion-proof valve 183 is reduced. Further, the shielding portion 11261 has a vent 11267, which is beneficial to enabling the gas to flow to the explosion-proof valve 183 through the vent 11267 when the air pressure inside the energy storage device 100 is greater than a certain value, so that the explosion-proof valve 183 explodes and releases the gas inside the energy storage device 100 in time, thereby improving the safety performance of the energy storage device 100. Moreover, the shielding portion 11261 and the fifth connecting sub-portion 11266 enclose a first side hole 11268, and the shielding portion 11261 and the second plastic body 1128 enclose a second side hole 11269, so that when the air pressure inside the energy storage device 100 is greater than a certain value, air can flow to the explosion-proof valve 183 through the first side hole 11268 and the second side hole 11269, so that the explosion-proof valve 183 explodes and releases the air inside the energy storage device 100 in time, thereby improving the safety performance of the energy storage device 100. The first connecting sub-portion 11262, the second connecting sub-portion 11263, the third connecting sub-portion 11264 and the fourth connecting sub-portion 11265 are sequentially arranged at intervals along the second direction, which is favorable for improving the structural strength of the fence portion 1129 and is favorable for the lamination of the second plastic piece 1126 and the top cover 180.
Optionally, in some embodiments, the orthographic projection of the second adapter 126 on the second surface falls within a range of the second surface, and a distance L7 from an end of the second adapter 122 of the second adapter 126 facing away from the first adapter 121 to an end of the second plastic body 1128 near the first plastic 1125 along the first direction is in a range of: the distance L8 from the end of the first adapting portion 121 away from the second adapting portion 122 to the end of the second plastic body 1128 away from the first plastic piece 1125 is greater than or equal to 7mm and less than or equal to 8 mm: l8 is more than or equal to 8mm and less than or equal to 9mm; the ratio of the width d3 of the first adapting portion 121 along the first direction to the width L9 of the second plastic body 1128 along the first direction is in the range of: d3/L9 is more than or equal to 0.44 and less than or equal to 0.53; along the second direction, a distance L10 between an end of the second adapting portion 122 facing away from the third adapting portion 123 and an end of the second plastic body 1128 ranges from: l10 is more than or equal to 3mm and less than or equal to 4mm; along the second direction, the ratio of the distance L11 between the second adapting portion 122 and the third adapting portion 123 to the width L12 of the second plastic body 1128 along the second direction is in the range of: L11/L12 is more than or equal to 0.23 and less than or equal to 0.45.
In this embodiment, the front projection of the second adapter 126 on the second surface falls within the range of the second surface, and the second plastic body 1128 protrudes from the second adapter 126, and along the first direction, the energy storage device 100 satisfies the relationship: the distance from the opposite ends of the second adaptor 126 to the opposite ends of the second plastic body 1128 is within a reasonable range, such that the second adaptor 126 does not protrude from the second plastic body 1128, and the second adaptor 126 is large enough to be attached to the surface of the second plastic body 1128 facing the electrode assembly 140 to the greatest extent, so that the shielding portion 11261 of the barrier portion 1129 of the second plastic member 1126 is prevented from collapsing toward the side close to the electrode assembly 140, and the first side hole 11268 and the second side hole 11269 are prevented from being too large to enable the broken tab 142 in the energy storage device 100 to directly pass through the second side hole 11269 to the explosion-proof valve 183, and the broken tab 142 is prevented from directly shielding the first side hole 11268 or the second side hole 11269 to prevent gas from flowing from the second side hole 11269, thereby improving the reliability of the explosion-proof valve. In addition, the first side hole 11268 is prevented from being excessively large, and the electrolyte having tackiness is prevented from flowing to the explosion-proof valve 183 through the first side hole 11268 to corrode the explosion-proof valve 183, thereby affecting the valve opening reliability of the explosion-proof valve 183. Furthermore, when the distance between the end of the second adapting portion 122 of the second adapting member 126 facing away from the first adapting portion 121 and the end of the second plastic body 1128 near the first plastic member 1125 is too small, the broken tab 142 may be in short-circuit connection with the top cover 180 through the second side hole 11269, so that the energy storage device 100 cannot be used normally. Along in the second direction, the energy storage device 100 satisfies the relationship 3mm being less than or equal to L10 being less than or equal to 4mm, then the distance between the end portion of the second adapting portion 122 deviating from the third adapting portion 123 and the end portion of the second plastic body 1128 is within a reasonable range, so that the second adapting piece 126 cannot protrude from the second plastic body 1128, and the second adapting piece 126 is large enough to be able to be laminated to the surface of the second plastic body 1128 facing the electrode assembly 140 to the greatest extent, thereby being beneficial to improving the structural stability of the lamination arrangement of the second adapting piece 126 and the second plastic piece 1126. Further, the energy storage device 100 satisfies 0.44 d3/L9 0.53, 0.23L 11/L12 0.45, so that the second adaptor 126 has a surface large enough to fit the surface of the second plastic body 1128 facing the electrode assembly 140.
Specifically, in the first direction, the distance L7 from the end of the second adapter 122 of the second adapter 126 facing away from the first adapter 121 to the end of the second plastic body 1128 near the first plastic 1125 may have a value of, but is not limited to, 7mm, 7.05mm, 7.1mm, 7.15mm, 7.2mm, 7.23mm, 7.3mm, 7.45mm, 7.5mm, 7.55mm, 7.6mm, 7.64mm, 7.7mm, 7.8mm, 7.9mm, 8mm, etc.
Specifically, the distance L8 from the end of the first adapter 121 distal from the second adapter 122 to the end of the second plastic body 1128 distal from the first plastic 1125 in the first direction may have values of, but is not limited to, 8mm, 8.05mm, 8.1mm, 8.15mm, 8.2mm, 8.23mm, 8.35mm, 8.39mm, 8.4mm, 8.45mm, 8.5mm, 8.55mm, 8.6mm, 8.65mm, 8.7mm, 8.79mm, 8.8mm, 8.9mm, 9mm, etc.
Specifically, the ratio of the width d3 of the first connecting portion 121 along the first direction to the width L9 of the second plastic body 1128 along the first direction may be, but is not limited to, 0.44, 0.445, 0.45, 0.455, 0.46, 0.465, 0.47, 0.475, 0.48, 0.485, 0.49, 0.495, 0.5, 0.505, 0.51, 0.52, 0.53, etc.
Specifically, in the second direction, the distance L10 between the end of the second adapter 122 facing away from the third adapter 123 to the end of the second plastic body 1128 may have a value of, but is not limited to, 3mm, 3.05mm, 3.1mm, 3.14mm, 3.2mm, 3.26mm, 3.3mm, 3.39mm, 3.4mm, 3.45mm, 3.5mm, 3.56mm, 3.65mm, 3.78mm, 3.82mm, 3.88mm, 3.9mm, 3.95mm, 4mm, etc.
Specifically, the ratio of the distance L11 between the second adapting portion 122 and the third adapting portion 123 along the second direction to the width L12 of the second plastic body 1128 along the second direction may be, but is not limited to, 0.23, 0.24, 0.25, 0.26, 0.27, 0.29, 0.3, 0.32, 0.33, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, etc.
Optionally, in some embodiments, the energy storage device 100 further includes an insulating member 220, the insulating member 220 is disposed around the outer circumference of the electrode assembly 140, and the insulating member 220 connects the first plastic body 1117, the fence portion 1129, and the second plastic body 1128.
In this embodiment, the insulating member 220 is disposed around the periphery of the electrode assembly 140, so that when the electrode assembly 140 is received in the housing 210 and is connected to the end cap assembly, the insulating member 220 can prevent the electrode assembly 140 from being in direct contact with the housing 210 to generate a short circuit connection, and the insulating member 220 provides a buffer layer between the electrode assembly 140 and the bottom of the housing 210, which is beneficial to preventing the electrode assembly 140 from being damaged by direct impact between the electrode assembly 140 and the bottom of the housing 210 during the handling of the energy storage device 100, and furthermore, the insulating member 220 allows a certain gap between the electrode assembly 140 and the bottom of the housing 210, which is convenient for the infiltration of the electrolyte, and is beneficial to improving the infiltration effect of the electrode assembly 140. In this embodiment, the first adaptor 124 is attached to the first plastic body 1117, so that the first plastic body 1117 is better attached to the side of the top cover 180 facing the electrode assembly 140, and the second adaptor 126 is attached to the second plastic body 1128, so that the second plastic body 1128 and the fence 1129 are better attached to the side of the top cover 180 facing the electrode assembly 140. The insulating member 220 is connected to the first plastic body 1117, the fence portion 1129 and the second plastic body 1128, and the first plastic body 1117, the fence portion 1129 and the second plastic body 1128 are well attached to the side of the top cover 180 facing the electrode assembly 140, so that the insulating member 220 can be prevented from being unable to be connected to the fence portion 1129 due to the fact that the fence portion 1129 collapses to the side close to the electrode assembly 140, and then the insulating member 220 is prevented from being difficult to completely surround the periphery of the electrode assembly 140, further the electrode assembly 140 is prevented from sinking to abut against the bottom of the casing 210, the buffering effect of the insulating member 220 on the electrode assembly 140 is ensured, the gap between the electrode assembly 140 and the bottom of the casing 210 is also ensured, and the electrolyte is facilitated.
Optionally, in some embodiments, the insulating member 220 is a mylar film and a mylar film, and the insulating member 220 is a film capable of ensuring good electrical insulation.
In some embodiments, in a direction perpendicular to the arrangement direction of the second transfer portion 122 and the third transfer portion 123, the gap d4 between the first transfer portion 121 and the liquid running portion 1116 satisfies the range: d4 is more than or equal to 0.5mm and less than or equal to 2.5mm. Specifically, the value of the gap d4 between the first transfer portion 121 and the liquid running portion 1116 may be, but is not limited to, 0.5mm, 0.52mm, 0.57mm, 0.62mm, 0.64mm, 0.68mm, 0.75mm, 0.79mm, 0.84mm, 0.95mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, and the like.
It is understood that the value of the gap d4 may be a distance from an end of the first transfer portion 121 near the liquid running portion 1116 to an end of the liquid running portion 1116 near the first transfer portion 121.
In this embodiment, when the value of the gap d4 satisfies the range 0.5mm and d4 and 2.5mm, the gap between the first adapting portion 121 and the liquid running portion 1116 is within a reasonable range, the first adapting portion 121 can abut against the surface of the lower plastic member 111 facing the electrode assembly 140, and the first adapting portion 121 improves the structural strength of the peripheral side of the lower plastic member 111 where the liquid running portion 1116 is disposed, so that when the electrolyte impacts the liquid running portion 1116 at a relatively high speed, the peripheral side of the lower plastic member 111 where the liquid running portion 1116 is disposed is not bent to the side close to the electrode assembly 140 due to the impact of the electrolyte, thereby avoiding affecting the liquid injection effect of the electrolyte. When the value of the gap d4 is greater than 2.5mm, the gap between the first adapting portion 121 and the liquid-running portion 1116 is too large, so that the area of the surface of the first adapting portion 121, which abuts against the lower plastic member 111 and faces the electrode assembly 140, is reduced, which is not beneficial to improving the structural strength of the lower plastic member 111 and reducing the service life of the lower plastic member 111. When the value of the gap d4 is smaller than 2.5mm, the gap between the first adapting portion 121 and the liquid-moving portion 1116 is too small, the first adapting portion 121 easily shields the liquid-moving portion 1116, or the gap between the third adapting portion 123 and the liquid-moving portion 1116 is too small, and the electrolyte easily impacts the liquid-moving portion 1116 and splashes laterally between the adapting piece 120 and the lower plastic piece 111, thereby reducing the electrical connection stability between the adapting piece 120 and the flange portion 1132.
In some embodiments, the number of the adapters 120 is two, one adapter 120 is a first adapter 124, the other adapter 120 is a second adapter 126, the first adapter 124 is a positive adapter, the second adapter 126 is a negative adapter, the first adapter 124 and the second adapter 126 are arranged at intervals along a first direction, a material of the first adapter 124 is selected from aluminum, a material of the second adapter 126 is selected from copper, and a ratio of a thickness D2 of the second adapter 126 to a thickness D1 of the first adapter 124 satisfies a range: D2/D1 is more than or equal to 0.5 and less than 1. Specifically, the ratio of the thickness D2 of the second adaptor 126 to the thickness D1 of the first adaptor 124 may be, but is not limited to, 0.5, 0.55, 0.58, 0.62, 0.63, 0.69, 0.72, 0.74, 0.76, 0.78, 0.82, 0.84, 0.86, 0.92, 0.93, 0.94, 0.96, 0.97, 0.99, etc.
It is understood that the values of D1 and D2 satisfy 0.5.ltoreq.D2/D1 < 1, and that the thickness of the first adapter 124 is greater than the thickness of the second adapter 126.
In this embodiment, the material of the first adaptor 124 is selected from aluminum, and the material of the second adaptor 126 is selected from copper. The density of copper is greater than the density of aluminum, then the weight of the second adapter 126 is greater than the weight of the first adapter 124 when the first adapter 124 and the second adapter 126 are the same size. When the values of D1 and D2 satisfy 0.5 and D2/D1 < 1, the thickness of the first adaptor 124 is smaller than the thickness of the second adaptor 126, and the first adaptor 124 and the second adaptor 126 can improve the structural strength of the lower plastic part 111 on the peripheral side where the liquid-feeding portion 1116 is disposed, so that when the electrolyte impacts the liquid-feeding portion 1116 at a relatively high speed, the peripheral side where the liquid-feeding portion 1116 is disposed on the lower plastic part 111 is not bent toward the side close to the electrode assembly 140 due to the impact of the electrolyte, thereby avoiding affecting the liquid-feeding effect of the electrolyte. In addition, the influence of the overload on the electrical connection stability with the flange portion 1132 can be avoided, so that the energy storage device 100 has high safety performance and high electrical connection stability. Furthermore, the price of copper is higher than that of aluminum, and on the premise of ensuring the improvement of the structural strength of the lower plastic part 111, the thickness of the first adapter 124 is smaller than that of the second adapter 126, which is beneficial to saving the cost, and in turn, reducing the manufacturing cost of the energy storage device 100. When the value of D2/D1 is greater than or equal to 1, the thickness of the second adapter 126 is greater than or equal to the thickness of the first adapter 124, the thickness of the second adapter 126 is too large or the thickness of the first adapter 124 is too small. When the thickness of the second adaptor 126 is too large, the weight of the second adaptor 126 is too large, so that the consumable of the second adaptor 126 is increased, and the manufacturing cost of the second adaptor 126 is increased; in addition, when the second adaptor 126 is excessively heavy and the flange portion 1132 is welded to be electrically connected, the second adaptor 126 is easily dropped due to the excessively heavy weight, thereby affecting the stability of the electrical connection between the second adaptor 126 and the flange portion 1132. When the thickness of the first adaptor 124 is too small, the first adaptor 124 abuts against the surface of the lower plastic part 111 facing the electrode assembly 140, and it is difficult for the first adaptor 124 to improve the structural strength of the lower plastic part 111, so that the lower plastic part 111 is easy to bend towards the side close to the electrode assembly 140 after a period of use, and the safety performance of the energy storage device 100 is reduced. When the value of D2/D1 is less than 0.5, the thickness of the second adapter 126 is too small or the thickness of the first adapter 124 is too large. When the thickness of the second adaptor 126 is too small, the second adaptor 126 abuts against the surface of the lower plastic part 111 facing the electrode assembly 140, and it is difficult for the second adaptor 126 to improve the structural strength of the lower plastic part 111, so that the lower plastic part 111 is easy to bend towards the side close to the electrode assembly 140 after a period of use, and the safety performance of the energy storage device 100 is reduced. When the thickness of the first adaptor 124 is too large, the weight of the first adaptor 124 is too large, so that the consumable of the first adaptor 124 is increased, and the manufacturing cost of the first adaptor 124 is increased; in addition, when the weight of the first adaptor 124 is too heavy and the first adaptor 124 is welded to the flange portion 1132 to achieve electrical connection, the first adaptor 124 is easily dropped due to its weight, thereby affecting the electrical connection stability of the first adaptor 124 and the flange portion 1132.
In some embodiments, the thickness D1 of the first adaptor 124 satisfies the range: d1 is more than or equal to 0.55mm and less than or equal to 0.85mm. Specifically, the thickness D1 of the first adaptor 124 may have a value of, but is not limited to, 0.55mm, 0.60mm, 0.62mm, 0.67mm, 0.69mm, 0.72mm, 0.75mm, 0.78mm, 0.79mm, 0.80mm, 0.82mm, 0.84mm, 0.85mm, etc.
It is understood that the thickness of the first adaptor 124 may be the height of the first adaptor 124 in a direction parallel to the direction in which the top cover 180 and the lower plastic member 111 are stacked.
In this embodiment, when the thickness D1 of the first adaptor 124 satisfies the range of 0.55mm and D1 and 0.85mm, the thickness of the first adaptor 124 is within a reasonable range, and the first adaptor 124 can improve the structural strength of the lower plastic part 111 on the peripheral side where the liquid running part 1116 is disposed, so that when the electrolyte impacts the liquid running part 1116 at a relatively high speed, the peripheral side where the liquid running part 1116 is disposed on the lower plastic part 111 is not bent to the side close to the electrode assembly 140 due to the impact of the electrolyte, thereby avoiding affecting the liquid injection effect of the electrolyte. Furthermore, it is also possible to avoid an influence on the electrical connection stability with the flange portion 1132 due to an excessive weight of the first adapter 124, so that the energy storage device 100 has high safety and electrical connection stability. When the thickness D1 of the first adaptor 124 is greater than 0.85mm, the thickness of the first adaptor 124 is too large, and the weight of the first adaptor 124 is too large, so that the consumable of the first adaptor 124 is increased, and the manufacturing cost of the first adaptor 124 is increased; in addition, when the weight of the first adaptor 124 is too heavy and the first adaptor 124 is welded to the flange portion 1132 to achieve electrical connection, the first adaptor 124 is easily dropped due to its weight, thereby affecting the electrical connection stability of the first adaptor 124 and the flange portion 1132. When the thickness D1 of the first adaptor 124 is smaller than 0.55mm, the thickness of the first adaptor 124 is too small, the first adaptor 124 abuts against the surface of the lower plastic part 111 facing the electrode assembly 140, and the first adaptor 124 is difficult to improve the structural strength of the lower plastic part 111, so that the lower plastic part 111 is easy to bend towards a side close to the electrode assembly 140 after a period of use, and the safety performance of the energy storage device 100 is reduced.
In some embodiments, the thickness D2 of the second adapter 126 satisfies the range: d2 is more than or equal to 0.45mm and less than or equal to 0.85mm. Specifically, the thickness D2 of the second adapter 126 may have a value of, but is not limited to, 0.45mm, 0.47mm, 0.49mm, 0.52mm, 0.54mm, 0.57mm, 0.59mm, 0.62mm, 0.64mm, 0.68mm, 0.75mm, 0.78mm, 0.79mm, 0.81mm, 0.82mm, 0.84mm, 0.85mm, etc.
It is understood that the thickness of the second adaptor 126 may be the height of the second adaptor 126 in a direction parallel to the direction in which the top cover 180 and the lower plastic member 111 are stacked.
In this embodiment, when the thickness of the second adaptor 126 satisfies the range of 0.45mm and D2 and 0.85mm, the thickness of the second adaptor 126 is within a reasonable range, and the second adaptor 126 can improve the structural strength of the peripheral side of the lower plastic part 111 where the liquid-feeding portion 1116 is disposed, so that when the electrolyte impacts the liquid-feeding portion 1116 at a relatively high speed, the peripheral side of the lower plastic part 111 where the liquid-feeding portion 1116 is disposed is not bent to the side close to the electrode assembly 140 due to the impact of the electrolyte, thereby avoiding affecting the liquid-feeding effect of the electrolyte. In addition, the influence of the overload of the second adapter 126 on the electrical connection stability with the flange 1132 can be avoided, so that the energy storage device 100 has high safety and electrical connection stability. When the thickness of the second adaptor 126 is greater than 0.85mm, the thickness of the second adaptor 126 is too large, and the weight of the second adaptor 126 is too large, so that the consumable of the second adaptor 126 is increased, and the preparation cost of the second adaptor 126 is increased; in addition, when the second adaptor 126 is excessively heavy and the flange portion 1132 is welded to be electrically connected, the second adaptor 126 is easily dropped due to the excessively heavy weight, thereby affecting the stability of the electrical connection between the second adaptor 126 and the flange portion 1132. When the thickness of the second adaptor 126 is less than 0.45mm, the thickness of the second adaptor 126 is too small, the second adaptor 126 abuts against the surface of the lower plastic part 111 facing the electrode assembly 140, and the second adaptor 126 is difficult to improve the structural strength of the lower plastic part 111, so that the lower plastic part 111 is easy to bend towards a side close to the electrode assembly 140 after a period of use, and then the safety performance of the energy storage device 100 is reduced.
In some embodiments, the first plastic 1125 includes a first plastic body 1117 and a plurality of ribs 1118, the first plastic body 1117 has the first surface 1111, the second surface 1112 and the through hole 1113, and the ribs 1118 are disposed on the second surface 1112 at intervals and on the outer periphery of the first plastic body 1117 along the second direction; the second plastic member 1126 includes a second plastic body 1128 and a plurality of ribs 1118, the second plastic body 1128 has the first surface 1111, the second surface 1112 and the through hole 1113, and the ribs 1118 are disposed on the second surface 1112 at intervals and on the outer periphery of the second plastic body 1128 along the second direction; the bead 1118 extends in the first direction.
In the terms of the present application, "a plurality" means greater than or equal to two.
In this embodiment, in the first plastic member 1125, the rib portions 1118 are disposed at intervals on the second surface 1112 and are disposed on the outer periphery of the first plastic body 1117 along the second direction, so that the rib portions 1118 are beneficial to improving the structural strength of the first plastic body 1117 along the first direction, and preventing the first plastic body 1117 from bending in a direction close to the electrode assembly 140 after being used for a certain period, so that the surface of the first plastic body 1117 facing away from the electrode assembly 140 is attached to the top cover 180, which is beneficial to reducing the occupation of the first plastic body 1117 to the space between the top cover 180 and the electrode assembly 140, so as to assemble more electrode assemblies 140 and improve the energy density in the unit volume of the energy storage device 100. In the second plastic member 1126, the rib portions 1118 are disposed at intervals on the second surface 1112 and are disposed on the outer periphery of the second plastic body 1128 along the second direction, the rib portions 1118 are beneficial to improving the structural strength of the second plastic body 1128 along the first direction, and preventing the second plastic body 1128 from bending in a direction close to the electrode assembly 140 after one-stage use, so that the surface of the second plastic body 1128, which is away from the electrode assembly 140, is attached to the top cover 180, which is beneficial to reducing the occupation of the second plastic body 1128 to the space between the top cover 180 and the electrode assembly 140, so as to assemble more electrode assemblies 140 and improve the energy density in the unit volume of the energy storage device 100.
In some embodiments, the energy storage device 100 further includes a first insulating film 150 and a second insulating film 160, where the first insulating film 150 is disposed on a side of the second adapting portion 122 facing the lower plastic part 111 and a side of the third adapting portion 123 facing the lower plastic part 111; the electrode assembly 140 includes an electrode plate 141 and a tab 142 that are electrically connected, the second switching portion 122 and the third switching portion 123 are electrically connected to the tab 142, a first welding portion 1222 is formed at a welding position of the second switching portion 122 and the tab 142, a first welding portion 1222 is formed at a welding position of the third switching portion 123 and the tab 142, and the second insulating film 160 is disposed on a side of the first welding portion 1222 facing away from the lower plastic part 111.
Alternatively, the number of the electrode tabs 141 is two, and the number of the tabs 142 is a plurality.
It may be appreciated that the first insulating film 150 is sandwiched between the second adapting portion 122 and the lower plastic part 111, and the first insulating film 150 is sandwiched between the third adapting portion 123 and the lower plastic part 111.
In the embodiment of the present application, during the welding process of the electrode assembly 140 and the adapter 120, one of the tab 142 and the second adapter 122 and the third adapter 123 is welded first to realize the electrical connection between the adapter 120 and the electrode assembly 140, and after one of the second adapter 122 and the third adapter 123 is welded to the tab 142, burrs are generated on the surface of one of the second adapter 122 and the third adapter 123 facing away from the electrode assembly 140, and the first insulating film 150 is inserted between one of the second adapter 122 and the third adapter 123 and the first adapter 121, so that the burrs generated after the welding can be prevented from rubbing the surface of the lower plastic part 111 facing the electrode assembly 140, thereby preventing the structural strength of the lower plastic part 111 from being reduced, and further ensuring the service life of the lower plastic part 111. Further, the first adaptor portion 121 is welded to the flange portion 1132, so as to electrically connect the adaptor 120 to the pole 113. In the present application, a first welding portion 1222 is formed at a welding position of the second adapting portion 122 and the tab 142, a first welding portion 1222 is formed at a welding position of the third adapting portion 123 and the tab 142, the second insulating film 160 is disposed at a side of the first welding portion 1222 facing away from the lower plastic part 111, more metal fragments may exist at the first welding portion 1222 after welding, and the second insulating film 160 is disposed at a side of the first welding portion 1222 facing away from the lower plastic part 111, which is beneficial to preventing the metal fragments from dropping to the electrode assembly 140 and being in short-circuit connection with the electrode assembly 140, thereby improving the safety performance of the energy storage device 100.
Optionally, in some embodiments, one end of the second insulating film 160 is disposed on a surface of the first welding portion 1222 facing away from the lower plastic, and the other end of the second insulating film 160 is disposed on an end surface of the electrode plate 141 facing the lower plastic, so as to prevent metal fragments generated after the welding of the first welding portion 1222 from dripping to the electrode plate 141 to be in short-circuit connection with the electrode plate 141.
In some embodiments, the energy storage device 100 further includes a third insulating film 170, a second welding portion 1211 is formed at a position where the first adapting portion 121 and the flange portion 1132 are welded, and the third insulating film 170 is disposed on a side of the second welding portion 1211 facing away from the lower plastic part 111.
In this embodiment, the welding position of the first adapting portion 121 and the flange portion 1132 forms a second welding portion 1211, and after the second welding portion 1211 is welded, more metal fragments may exist, and the third insulating film 170 is disposed on the side of the second welding portion 1211 facing away from the lower plastic part 111, which is beneficial to preventing the metal fragments from falling to the electrode assembly 140 and being in short-circuit connection with the electrode assembly 140, thereby improving the safety performance of the energy storage device 100.
Alternatively, the thickness of the third insulating film 170 is greater than the thickness of the first insulating film 150, and the thickness of the third insulating film 170 is greater than the thickness of the second insulating film 160.
In this embodiment, the thickness of the third insulating film 170 is greater than the thickness of the first insulating film 150, the thickness of the third insulating film 170 is greater than the thickness of the second insulating film 160, so that the high temperature resistance of the third insulating film 170 is higher than the high temperature resistance of the first insulating film 150 and the second insulating film 160, and in the process of electrically connecting the connecting piece with the pole 113 and the electrode assembly 140, the second welding portion 1211 is formed by welding the connecting piece with the flange portion 1132 of the pole 113, so as to achieve electrical connection, after the welding is completed, the temperature of the second welding portion 1211 is higher, and the third insulating film 170 with higher high temperature resistance can be directly attached to the surface of the second welding portion 1211 facing the electrode assembly 140 without buckling and bending, which is beneficial to accelerating the assembly process of the energy storage device 100. Further, the thickness of the third insulating film 170 is greater than that of the second insulating film 160, the second insulating film 160 is softer than that of the third insulating film 170, the third insulating film 170 is harder, the tab 142 is welded to the connecting member to form the first welded portion 1222, and the first welded portion 1222 generates more burrs during welding, so that the surface of the first welded portion 1222 facing the electrode assembly 140 is rougher than the surface of the second welded portion 1211, so that the softer second insulating film 160 needs to be attached to the surface of the first welded portion 1222 facing the electrode assembly 140, thereby increasing the adhesion reliability of the second insulating film 160 and the first welded portion 1222, ensuring that metal chips generated during welding will not drip into the electrode assembly 140 to be connected with the electrode assembly 140 in a short circuit, and improving the safety performance of the energy storage device 100.
Referring to fig. 3 to 17, in some embodiments, the lower plastic part 111 includes a first plastic body 1117 and a liquid-feeding portion 1116, the first plastic body 1117 is disposed around the periphery of the liquid-feeding portion 1116, and the first plastic body 1117 has the first surface 1111, the second surface 1112 and the through hole 1113; the liquid-moving part 1116 comprises a shielding sub-part 1119 and a plurality of connecting sub-parts 1121, wherein the plurality of connecting sub-parts 1121 are arranged at intervals on the periphery of the shielding sub-part 1119, are respectively connected with the shielding sub-part 1119 in a bending way, and two arbitrary adjacent connecting sub-parts 1121 are enclosed into a liquid-leakage hole 1122; one end of each of the connection sub-portions 1121 facing away from the shielding sub-portion 1119 is connected to the first plastic body 1117, and the shielding sub-portion 1119 is closer to the electrode assembly 140 than the first plastic body 1117.
It is understood that the shielding sub-portion 1119 is closer to the electrode assembly 140 than the first plastic body 1117, and the shielding sub-portion 1119 may be disposed on a side of the first plastic body 1117 facing the electrode assembly 140.
As can be appreciated, the liquid-feeding portion 1116 includes the liquid-leakage holes 1122, the number of the liquid-leakage holes 1122 is plural, and the liquid-leakage holes 1122 are spaced apart.
In this embodiment, the liquid-feeding portion 1116 includes a shielding sub-portion 1119 and a plurality of connecting sub-portions 1121, and the shielding sub-portion 1119 is closer to the electrode assembly 140 than the first plastic body 1117, when the electrolyte is injected into the liquid-injecting hole 182, the electrolyte will impact the shielding sub-portion 1119, the shielding sub-portion 1119 provides a buffer plate for the injection of the electrolyte, so as to avoid the electrolyte from directly impacting the electrode assembly 140 to make the active material in the electrode assembly 140 fall off, and avoid the tab 142 from being directly connected with the electrode pole piece 141 in a short circuit manner during the impact process, which is beneficial to improving the safety performance of the energy storage device 100. Furthermore, the shielding part 1119 can prevent the electrode assembly 140 from directly pressing the sealant pin 190 to crack the top cover 180, which is beneficial to prolonging the service life of the energy storage device 100. Further, the plurality of connection sub-portions 1121 and the shielding sub-portions 1119 are respectively bent and connected, and two arbitrary adjacent connection sub-portions 1121 are enclosed to form a drain hole 1122, so that when the electrolyte is injected from the liquid injection hole 182 and impacted to the shielding sub-portions 1119, the electrolyte can flow into the electrode assembly 140 from the drain hole 1122, which is beneficial to improving the uniformity of electrolyte injection, and further improving the electrolyte injection effect.
In some embodiments, the width of the end of the connector portion 1121 adjacent to the first plastic body 1117 is greater than the width of the end of the connector portion 1121 adjacent to the shroud portion 1119.
In this embodiment, along the circumferential direction surrounding the shielding sub-portion 1119, the width of the connecting sub-portion 1121 near one end of the first plastic body 1117 is larger, so that the connecting structure of the connecting sub-portion 1121 and the first plastic body 1117 is enhanced, and the connecting structure of the connecting sub-portion 1121 and the first plastic body 1117 is prevented from breaking when the liquid-moving portion 1116 is impacted by the electrolyte, so that the shielding sub-portion 1119 and the connecting sub-portion 1121 fall off from the first plastic body 1117, and the liquid-moving portion 1116 cannot function normally. The width of the connecting sub-portion 1121 near the end of the shielding sub-portion 1119 is smaller, so that the gap formed between the adjacent connecting sub-portions 1121 is increased, namely, the liquid leakage hole 1122 is increased, the liquid running amount of the electrolyte is increased, the electrolyte is prevented from being deposited on the surface of the shielding sub-portion 1119, which faces away from the electrode assembly 140, so that when the electrolyte impacts the shielding sub-portion 1119, the electrolyte can flow along the liquid leakage hole 1122 towards the direction of the electrode assembly 140, the flow of the electrolyte is smoother, and the liquid injection effect of the electrolyte is improved.
In some embodiments, the liquid-moving portion 1116 further includes a bending sub-portion 1123, where the bending sub-portion 1123 is located between the shielding sub-portion 1119 and the connecting sub-portion 1121, and is used for connecting the shielding sub-portion 1119 and the connecting sub-portion 1121, the widths of the plurality of connecting sub-portions 1121 are equal, and the width of the bending sub-portion 1123 gradually decreases from one end connected to the connecting sub-portion 1121 to one end connected to the shielding sub-portion 1119.
It will be appreciated that a plurality of the connector sub-portions 1121 are connected to the shutter sub-portion 1119 by bending the bent sub-portions 1123.
In this embodiment, along the circumferential direction surrounding the shielding sub-portion 1119, the width of the bending sub-portion 1123 gradually decreases from the end connected to the connecting sub-portion 1121 to the end connected to the shielding sub-portion 1119, that is, the bending sub-portion 1123 forms a "taper angle", and the end of the bending sub-portion 1123, which is close to the shielding sub-portion 1119, forms a structure similar to a "taper angle", which is beneficial to further increasing the drain hole 1122, and thus increasing the liquid running amount of the electrolyte, and avoiding the electrolyte from depositing on the surface of the shielding sub-portion 1119, which is away from the electrode assembly 140. When the electrolyte impacts the shielding part 1119, the electrolyte can flow along the leakage hole 1122 toward the electrode assembly 140, so that the flow of the electrolyte is smoother, which is beneficial to improving the injection effect of the electrolyte.
Optionally, in some embodiments, the surface of the bent sub-portion 1123 facing away from the first plastic body 1117 is at least partially curved, in other words, the side of the bent sub-portion 1123 facing away from the first plastic body 1117 has an arc chamfer.
In this embodiment, the surface of the bending sub-portion 1123 facing away from the first plastic body 1117 is at least partially an arc surface, so that when the surface of the liquid-moving portion 1116 facing the electrode assembly 140 abuts against the electrode assembly 140, the electrode assembly 140 is prevented from being scratched by the bending sub-portion 1123, thereby avoiding negative effects on the safety performance and the cycle performance of the energy storage device 100.
In some embodiments, the electrode assembly 140 includes an electrode tab 141 and a tab 142 electrically connected, the tab 142 is welded to the adaptor 120, and a first welding portion 1222 is formed at a welding position of the tab 142 and the adaptor 120; the surface of the first weld 1222 facing away from the top cover 180 is closer to the top cover 180 than the surface of the shroud 1119 facing toward the top cover 180.
In this embodiment, the surface of the shielding sub-portion 1119 facing the top cover 180 is further away from the top cover 180 than the surface of the first welding portion 1222 facing away from the top cover 180, so that when the electrolyte is injected from the liquid injection hole 182 and impacts the shielding sub-portion 1119, the electrolyte is prevented from splashing directly to the first welding portion 1222 when overflowed from the liquid leakage hole 1122, so that the high-speed injected electrolyte is prevented from flushing the first welding portion 1222, the stability of the electrical connection between the tab 142 and the adapter 120 is improved, and the assembly yield of the energy storage device 100 is improved.
In some embodiments, the first plastic 1125 further comprises a boss 1124 disposed on the second surface 1112 and disposed on an outer periphery of the first plastic body 1117 away from the second plastic 1126 along the first direction; the second plastic 1126 further includes a boss 1124, where the boss 1124 is disposed on the second surface 1112 and is disposed on an outer periphery of the second plastic body 1128 away from the first plastic 1125 along the first direction, and the boss 1124 extends along the second direction; the surface of the shielding sub-portion 1119 facing away from the first plastic body 1117 is closer to the first plastic body 1117 than the surface of the boss 1124 facing away from the first plastic body 1117.
In this embodiment, the boss 1124 is disposed on the outer periphery of the first plastic body 1117 away from the second plastic piece 1126, the boss 1124 is disposed on the second surface 1112, and is disposed on the outer periphery of the second plastic body 1128 away from the first plastic piece 1125 along the first direction, and the shielding sub-portion 1119 is away from the surface of the first plastic body 1117 and is closer to the first plastic body 1117 than the surface of the boss 1124 away from the first plastic body 1117, so that when the energy storage device 100 falls or vibrates, the boss 1124 abuts against the electrode assembly 140, but the shielding sub-portion 1119 does not abut against the electrode assembly 140, so as to avoid the second insulating film 160 from shielding the gap between the electrode pole pieces 141, thereby avoiding affecting the injection of the electrolyte and helping to improve the injection efficiency.
Optionally, in some embodiments, a surface of the boss 1124 facing away from the cap 180 is disposed closer to the electrode assembly 140 than a surface of the bead 1118 facing away from the cap 180.
In this embodiment, the surface of the boss 1124 facing the electrode assembly 140 is disposed closer to the electrode assembly 140 than the surface of the bead 1118 facing the electrode assembly 140, so that when the energy storage device 100 falls or vibrates, the boss 1124 abuts against the electrode assembly 140, preventing the thinner bead 1118 from directly abutting against the electrode plate 141 and being inserted into the electrode plate 141, which is beneficial to avoiding damage to the electrode plate 141; in addition, the protruding rib 1118 may be prevented from rubbing the second insulating film 160 to break the second insulating film 160, so that the probability of short-circuit connection between the metal chips and the electrode plate 141 is reduced, and the safety performance of the energy storage device 100 is improved.
Referring to fig. 18 and 19, the present application further provides an electrical system 300, where the electrical system 300 includes: the energy storage device 100 is configured to supply power to the electric device 310.
In this embodiment, the energy storage device 100 has a long service life, so that when the energy storage device 100 is applied to the power utilization system 300, a stable power supply can be provided for the power utilization device 310, so that the power utilization system 300 can work stably.
The power consumption system 300 of the embodiment of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, a smart bracelet, a smart watch, an electronic reader, a game console, etc. And can also be vehicles such as automobiles, trucks, sedans, trucks, vans, motor cars, high-speed rails, electric automobiles and the like. In addition, various home appliances and the like are also possible. The power system 300 of the embodiment of fig. 19 of the present application is an energy storage battery cabinet.
It should be understood that the electrical system 300 described in this embodiment is only one form of the electrical system 300 to which the energy storage device 100 is applied, and should not be construed as a limitation of the electrical system 300 provided by the present application, or as a limitation of the electrical system 300 provided by the various embodiments of the present application.
Reference in the specification to "an embodiment," "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments. Furthermore, it should be understood that the features, structures or characteristics described in the embodiments of the present application may be combined arbitrarily without any conflict with each other, to form yet another embodiment without departing from the spirit and scope of the present application.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.
Claims (17)
1. An energy storage device, the energy storage device comprising:
the end cover assembly comprises a lower plastic part and a pole, wherein the lower plastic part is provided with a first surface and a second surface which are arranged in a back-to-back mode, the lower plastic part is also provided with a through hole penetrating through the first surface and the second surface, the through hole comprises a first hole section and a second hole section which are communicated, the radial size of the first hole section is smaller than that of the second hole section, and the second hole section is closer to the second surface than the first hole section; the pole comprises a penetrating part and a flange part, the penetrating part is convexly arranged on the flange part, the penetrating part is arranged on the first hole section, the flange part is arranged on the second hole section, and the surface of the flange part, deviating from the penetrating part, is flush with the second surface;
The adapter is arranged on one side, away from the lower plastic part, of the flange part, the adapter is electrically connected with the flange part, and the surface, facing the end cover assembly, of the adapter abuts against the second surface; and
the electrode assembly is arranged on one side, deviating from the end cover assembly, of the adapter, the electrode assembly comprises an electrode pole piece and a pole lug which are electrically connected, and the pole lug is electrically connected with the adapter.
2. The energy storage device of claim 1, wherein the adapter comprises a first adapter portion, a second adapter portion, and a third adapter portion, the second adapter portion and the third adapter portion being disposed on a same side of the first adapter portion along a first direction and electrically connected to the first adapter portion, respectively; the second switching part and the third switching part are arranged at intervals along a second direction, the first switching part is electrically connected with the flange part, and the second switching part and the third switching part are electrically connected with one end of the tab; the first direction is the length direction of the end cover assembly, and the second direction is the width direction of the end cover assembly; along the second direction, the width d1 of the second adapting portion satisfies the range: d1 is less than or equal to 18.18mm and less than or equal to 22.88mm, and the width d2 of the third switching part meets the range: d2 is more than or equal to 18.18mm and less than or equal to 22.88mm.
3. The energy storage device of claim 2, wherein the number of lower plastic parts is two, the two lower plastic parts comprise a first plastic part and a second plastic part, and the first plastic part and the second plastic part are arranged at intervals along the first direction; the first transfer part is arranged opposite to the first plastic part, and the first transfer part, the second transfer part and the third transfer part of the first transfer part are surrounded to form an opening; the first plastic part comprises a first plastic body and a liquid feeding part, the first plastic body is provided with the first surface, the second surface and the through hole, and the orthographic projection of the liquid feeding part on the surface of the first adapter facing the first plastic part falls into the range of the opening;
the orthographic projection of the first adapter on the second surface falls into the range of the second surface, along the first direction, the range of the distance L1 from the end part of the second adapter away from the first adapter to the end part of the first plastic body close to the second plastic part is as follows: the distance L2 between the end part of the first switching part, which is far away from the second switching part, and the end part of the first plastic body, which is far away from the second plastic part, is 3mm or more and L1 or less than 4 mm; l2 is more than or equal to 9mm and less than or equal to 11mm; the ratio of the width d3 of the first transfer portion along the first direction to the width L3 of the first plastic body along the first direction is in the range of: d3/L3 is more than or equal to 0.44 and less than or equal to 0.53; along the second direction, the range of the distance L4 from the end part of the second adapting part, which is away from the third adapting part, to the end part of the first plastic body is: l4 is more than or equal to 3.5mm and less than or equal to 4.5mm; along the second direction, the ratio of the distance L5 between the second adapting portion and the third adapting portion to the width L6 of the first plastic body along the second direction is in the range of: L5/L6 is more than or equal to 0.23 and less than or equal to 0.37.
4. The energy storage device of claim 3, wherein the end cap assembly further comprises a top cap and an explosion-proof valve, the top cap is arranged on one side of the lower plastic part facing away from the electrode assembly, the top cap is provided with two surfaces which are arranged in a back-to-back manner, the explosion-proof hole penetrates through the two surfaces of the top cap, the explosion-proof valve seals the explosion-proof hole, the second plastic part comprises a connected second plastic body and a fence part, the fence part comprises a first connector part, a second connector part, a third connector part, a fourth connector part, a fifth connector part and a shielding part, the first connector part, the second connector part, the third connector part and the fourth connector part are sequentially arranged on the surface of the shielding part facing the top cap at intervals along a second direction, one ends of the first connector part, the second connector part, the third connector part and the fourth connector part are respectively connected with one ends of the second plastic body close to one end of the first plastic part, the first connector part, the second connector part, the third connector part and the fourth connector part are provided with side holes, and the fifth connector part is provided with side holes; the shielding part and the second plastic body are enclosed to form a second side hole; the orthographic projection part of the shielding part on the surface of the top cover facing the electrode assembly falls into the range of the explosion-proof valve; the adapter piece is a second adapter piece, and the second adapter piece and the second plastic piece are oppositely arranged;
The orthographic projection of the second adapter on the second surface falls into the range of the second surface, and along the first direction, the range of the distance L7 from the end part of the second adapter to the end part of the second plastic body, which is close to the first plastic part, is as follows: the range of the distance L8 from the end part of the first switching part far away from the second switching part to the end part of the second plastic body far away from the first plastic part is that the L7 mm is less than or equal to 8 mm: l8 is more than or equal to 8mm and less than or equal to 9mm; the ratio of the width d3 of the first transfer portion along the first direction to the width L9 of the second plastic body along the first direction is in the range of: d3/L9 is more than or equal to 0.44 and less than or equal to 0.53; along the second direction, the distance L10 between the end part of the second adapting part, which is away from the third adapting part, and the end part of the second plastic body is in the range of: l10 is more than or equal to 3mm and less than or equal to 4mm; along the second direction, the ratio of the distance L11 between the second adapting portion and the third adapting portion to the width L12 of the second plastic body along the second direction is in the range of: L11/L12 is more than or equal to 0.23 and less than or equal to 0.45.
5. The energy storage device of claim 4, further comprising an insulator disposed around an outer perimeter of the electrode assembly, the insulator connecting the first plastic body, the fence portion, and the second plastic body.
6. The energy storage device of claim 3, wherein a gap d4 between the first transfer portion and the liquid running portion in a direction perpendicular to an arrangement direction of the second transfer portion and the third transfer portion satisfies a range: d4 is more than or equal to 0.5mm and less than or equal to 2.5mm.
7. The energy storage device of claim 1, wherein the number of said adapters is two, one of said adapters is a first adapter, the other adapter is a second adapter, said first adapter and said second adapter are spaced apart along a first direction, a material of said first adapter is selected from aluminum, a material of said second adapter is selected from copper, and a ratio of a thickness D2 of said second adapter to a thickness D1 of said first adapter satisfies a range: D2/D1 is more than or equal to 0.5 and less than 1.
8. The energy storage device of claim 7, wherein the thickness D1 of the first adapter member satisfies the range: d1 is more than or equal to 0.55mm and less than or equal to 0.85mm; the thickness D2 of the second adapter member satisfies the following range: d2 is more than or equal to 0.45mm and less than or equal to 0.85mm.
9. The energy storage device of claim 3, wherein the first plastic part comprises a first plastic body and a plurality of ribs, the first plastic body has the first surface, the second surface and the through hole, the ribs are arranged on the second surface at intervals and are arranged on the periphery of the first plastic body along the second direction; the second plastic part comprises a second plastic body and a plurality of convex rib parts, the second plastic body is provided with the first surface, the second surface and the through holes, and the convex rib parts are arranged on the second surface at intervals and are arranged on the periphery of the second plastic body along the second direction; the bead portion extends in the first direction.
10. The energy storage device of any one of claims 2 to 6, further comprising a first insulating film and a second insulating film, the first insulating film being disposed on a side of the second transfer portion facing the lower plastic part and a side of the third transfer portion facing the lower plastic part; the second switching portion and the third switching portion are electrically connected with the electrode lug, a first welding portion is formed at the welding position of the second switching portion and the electrode lug, a first welding portion is formed at the welding position of the third switching portion and the electrode lug, and the second insulating film is arranged on one side, deviating from the lower plastic part, of the first welding portion.
11. The energy storage device of claim 10, further comprising a third insulating film, wherein the location where the first transfer portion is welded to the flange portion forms a second welded portion, the third insulating film is disposed on a side of the second welded portion facing away from the lower plastic part, wherein a thickness of the third insulating film is greater than a thickness of the first insulating film, and a thickness of the third insulating film is greater than a thickness of the second insulating film.
12. The energy storage device of claim 4, wherein the liquid feeding portion comprises a shielding part and a plurality of connecting parts, the plurality of connecting parts are arranged at intervals on the periphery of the shielding part and are respectively connected with the shielding part in a bending way, and any two adjacent connecting parts are enclosed into a liquid leakage hole; one end of each connecting sub-part, which is away from the shielding sub-part, is connected with the first plastic body, and the shielding sub-part is closer to the electrode assembly than the first plastic body.
13. The energy storage device of claim 12, wherein the liquid running portion further comprises a bending sub-portion, the bending sub-portion is located between the shielding sub-portion and the connecting sub-portion and is used for connecting the shielding sub-portion and the connecting sub-portion, the widths of the plurality of connecting sub-portions are equal, and the width of the bending sub-portion gradually decreases from one end connected with the connecting sub-portion to one end connected with the shielding sub-portion.
14. The energy storage device of claim 12, wherein the tab is welded to the adapter, and wherein a location where the tab is welded to the adapter forms a first weld; the surface of the first weld facing away from the top cover is closer to the top cover than the surface of the shroud portion facing toward the top cover.
15. The energy storage device of claim 12, wherein the first plastic piece further comprises a boss disposed on the second surface and disposed on an outer periphery of the first plastic body away from the second plastic piece in the first direction; the second plastic part further comprises a boss, the boss is arranged on the second surface and is arranged on the periphery of the second plastic body, far away from the first plastic part, along the first direction, and the boss extends along the second direction; the surface of shielding sub-portion deviating from the first plastic body is closer to the first plastic body than the surface of boss deviating from the first plastic body.
16. An electrical power consumption system, comprising:
an electric device; and
the energy storage device of any one of claims 1-15, the energy storage device to power the powered device.
17. An energy storage system, comprising:
user load;
the first electric energy conversion device and the second electric energy conversion device are used for converting other forms of energy into electric energy, the first electric energy conversion device and the second electric energy conversion device are electrically connected with the user load, and the electric energy converted by the first electric energy conversion device and the electric energy converted by the second electric energy conversion device supply power for the user load;
the energy storage device of any one of claims 1 to 15, wherein the energy storage device is electrically connected to the consumer load, the first electrical energy conversion device, and the second electrical energy conversion device, respectively, the energy storage device storing electrical energy converted by the first electrical energy conversion device and the second electrical energy conversion device, the energy storage device powering the consumer load.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117080634A (en) * | 2023-09-15 | 2023-11-17 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009259651A (en) * | 2008-04-17 | 2009-11-05 | Hitachi Maxell Ltd | Manufacturing method of sealed battery |
| CN111769249A (en) * | 2020-07-08 | 2020-10-13 | 江苏塔菲尔新能源科技股份有限公司 | Power battery is with plastic part, top cap assembly structure down and power battery |
| WO2023280232A1 (en) * | 2021-07-09 | 2023-01-12 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and power consuming device |
-
2023
- 2023-08-16 CN CN202311032220.8A patent/CN116742284B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009259651A (en) * | 2008-04-17 | 2009-11-05 | Hitachi Maxell Ltd | Manufacturing method of sealed battery |
| CN111769249A (en) * | 2020-07-08 | 2020-10-13 | 江苏塔菲尔新能源科技股份有限公司 | Power battery is with plastic part, top cap assembly structure down and power battery |
| WO2023280232A1 (en) * | 2021-07-09 | 2023-01-12 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and power consuming device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117080634A (en) * | 2023-09-15 | 2023-11-17 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
| CN117080634B (en) * | 2023-09-15 | 2023-12-22 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
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| CN116742284B (en) | 2023-10-31 |
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