CN117855641A - Energy storage device and electric equipment - Google Patents
Energy storage device and electric equipment Download PDFInfo
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- CN117855641A CN117855641A CN202410245747.7A CN202410245747A CN117855641A CN 117855641 A CN117855641 A CN 117855641A CN 202410245747 A CN202410245747 A CN 202410245747A CN 117855641 A CN117855641 A CN 117855641A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 139
- 230000005284 excitation Effects 0.000 claims abstract description 51
- 230000005611 electricity Effects 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims description 45
- 239000002184 metal Substances 0.000 claims description 45
- 238000010079 rubber tapping Methods 0.000 claims description 16
- 238000007086 side reaction Methods 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 25
- 230000008569 process Effects 0.000 description 20
- 239000000463 material Substances 0.000 description 19
- 239000007789 gas Substances 0.000 description 11
- 239000000919 ceramic Substances 0.000 description 10
- 230000000903 blocking effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000004880 explosion Methods 0.000 description 7
- 238000009527 percussion Methods 0.000 description 6
- 230000001960 triggered effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003797 telogen phase Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides an energy memory and consumer, energy memory includes the casing, the top cap, electrode assembly, the positive pole, negative pole post and voltage excitation ware, electrode assembly and voltage excitation ware all hold in the casing, the top cap lid closes in the casing, the top cap is provided with explosion-proof valve, positive pole post and negative pole post are installed on the top cap, top cap and electrode assembly electricity are all worn to establish to positive pole post and negative pole post, voltage excitation ware's one end electricity is connected in positive pole post, voltage excitation ware's the other end electricity is connected in negative pole post, voltage excitation ware can take place deformation in order to produce excitation voltage, excitation voltage is greater than or equal to energy memory's overcharge voltage threshold value. The excitation voltage generated by the voltage exciter is larger than or equal to the overcharge voltage threshold of the energy storage device, so that the energy storage device reaches the overcharge voltage threshold in advance to stop charging, the overcharge time is shortened to be before the explosion-proof valve is opened, the continuous input of energy and the continuous deterioration of temperature and side reaction are reduced, and the overcharge problem of the energy storage device is effectively improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an energy storage device and electric equipment.
Background
In general, a bare cell of a battery such as a lithium ion battery is formed by winding a positive pole piece, a negative pole piece and a diaphragm, the positive pole piece and the negative pole piece are provided with a pole lug structure, the pole lug, a connecting piece and a pole post are connected to form an electric conduction and heat conduction path, generally, the battery can continuously generate a large amount of gas in the overcharging process, so that the internal pressure of the cell is continuously increased, explosion and other dangers caused by the infinite accumulation of heat and combustible gas in the overcharging process of the cell are prevented, the cell is generally provided with an explosion-proof valve structure, when the pressure reaches a certain threshold value, the explosion-proof valve is opened, the internal heat and the pressure of an electrode assembly are released, but after the valve is opened, the cell has a probability of not reaching a voltage cut-off condition to continue the overcharging, and continuous deterioration of the temperature and side reaction of the cell is easy to cause.
Disclosure of Invention
The application provides an energy storage device and electric equipment, at least, be used for solving the problem that still overcharging after the electricity core opens the valve and charge.
In a first aspect, the present application provides an energy storage device, it includes casing, top cap, electrode assembly, positive pole, negative pole post and voltage exciter, electrode assembly with voltage exciter all holds in the casing, the top cap lid in the casing, be provided with explosion-proof valve on the top cap, positive pole post with the negative pole post is installed on the top cap, positive pole post with the negative pole post is all worn to establish the top cap with electrode assembly electricity is connected, voltage exciter's one end electricity connect in positive pole post, voltage exciter's the other end electricity connect in negative pole post, voltage exciter can take place deformation in order to produce excitation voltage, excitation voltage is greater than or equal to energy storage device's overcharge voltage threshold value.
According to the energy storage device, the voltage exciter is arranged in the shell and is electrically connected between the positive pole and the negative pole, when a large amount of gas generated in the overcharging process of the energy storage device enables the pressure in the shell to reach a certain threshold value, the voltage exciter is triggered to collide and deform to generate exciting voltage, and the exciting voltage is larger than or equal to the overcharging pressure threshold value of the energy storage device, so that the energy storage device reaches the overcharging pressure threshold value in advance to stop charging, the overcharging time is shortened to be before the explosion-proof valve is opened, the overcharging process is greatly shortened, the problem of insufficient safety of the material and design level of an electrode assembly is solved, the continuous input of energy and continuous deterioration of temperature and side reaction are reduced, and the overcharging problem of the energy storage device is effectively improved; in addition, the voltage exciter is directly connected with the positive pole and the negative pole, and when the voltage exciter is triggered, a voltage signal can be given to a battery management system (Battery Management System, BMS) of the energy storage device, so that the BMS stops charging the energy storage device; the trigger of voltage trigger has simulated energy memory and has reached the overcharge voltage threshold value, and then triggers BMS and stop the condition that continues to charge, and whole control process does not have extra detection element, and need not to change current BMS control logic for energy memory system overall cost at energy memory place reduces, and the security performance promotes.
With reference to the first aspect, in one possible implementation manner, the energy storage device further includes a lower plastic, along a height direction of the energy storage device, the lower plastic is stacked with the top cover, the lower plastic is installed on a side of the top cover facing the electrode assembly, and the voltage exciter is installed on a surface of the lower plastic facing the electrode assembly.
Along the direction of height of energy storage device, install voltage exciter on the surface of lower plastic towards electrode subassembly one side for the gas that energy storage device overcharged in-process produced can produce the striking to voltage exciter, makes voltage exciter can take place deformation and produces excitation voltage, simultaneously, top cap, lower plastic and voltage exciter set gradually in the direction of height of energy storage device, guarantee the insulativity between voltage exciter and the top cap, ensure that voltage exciter can not be connected with the top cap electricity in the use, reduce or avoid inside phenomenon that appears the short circuit.
With reference to the first aspect, in a possible implementation manner, the top cover is provided with a explosion protection hole, the explosion protection valve is installed in the explosion protection hole, the lower plastic is formed with a cavity, the cavity is communicated with the interior of the shell, and the cavity is opposite to the explosion protection hole along the height direction of the energy storage device; the voltage exciter is arranged on the outer wall surface of the chamber on the side facing the electrode assembly.
The voltage exciter is arranged on the outer wall surface of the chamber, which faces one side of the electrode assembly, and the pressure of gas generated by the energy storage device in the overcharging process is high at the chamber, so that the voltage exciter is easier to excite, the overcharging time can be greatly shortened, and the problem of overcharging safety can be effectively solved.
With reference to the first aspect, in one possible implementation manner, the voltage exciter includes a voltage exciter and a resistor, the voltage exciter is connected in series with the resistor, and the voltage exciter and the resistor are electrically connected between the positive pole and the negative pole.
Through addding the resistance, resistance and voltage excitation spare and establish ties, reduce the voltage between positive pole post and the negative pole post, realize the effect of partial pressure, prevent that the voltage excitation spare produced is too big, influence energy storage device's life.
With reference to the first aspect, in one possible implementation manner, the resistor and the voltage excitation member are arranged on an outer wall surface of the chamber on a side facing the electrode assembly at intervals, and the explosion-proof hole, the resistor and the voltage excitation member are arranged in a staggered manner.
The resistor and the voltage excitation piece are arranged on the outer wall surface of one side of the cavity facing the electrode assembly at intervals, and gas generated in the overcharging process of the energy storage device can flow to the explosion-proof hole through the cavity, so that the valve can be smoothly opened by the energy storage device under the condition that the air pressure in the shell is extreme, and the explosion phenomenon of the energy storage device is prevented.
With reference to the first aspect, in one possible implementation manner, the voltage excitation member has a first resistance value R1 when turned on, the voltage excitation member deforms to generate a first voltage value V1, the resistor has a second resistance value R2, and the second resistance value R2 of the resistor satisfies: r2> 5.475R 1/V1-R1.
The second resistance value R2 by setting the resistance satisfies: r2 is greater than 5.475 times R1/V1-R1, so that the divided voltage of the resistor is large enough, the influence of the integral voltage of the voltage exciter on the energy storage device is reduced, and the possibility that the energy storage device is damaged due to overlarge voltage between the positive pole and the negative pole of the energy storage device is reduced.
With reference to the first aspect, in one possible implementation manner, the voltage exciter includes a housing, a first metal sheet, a second metal sheet, a tapping member and a blocking sheet, where the first metal sheet, the second metal sheet, the tapping member and the blocking sheet are all contained in the housing, the first metal sheet and the second metal sheet are disposed on surfaces of opposite sides of the voltage exciter, the tapping member is disposed opposite to the first metal sheet, the tapping member is elastically connected between the blocking sheet and a side wall of the housing, and the blocking sheet can move to drive the tapping member to strike the first metal sheet or away from the first metal sheet.
The device comprises a baffle plate, a shell, a first metal sheet, a second metal sheet, a percussion piece, a voltage excitation piece and an energy storage device, wherein the percussion piece is elastically connected between the baffle plate and one side wall of the shell, when the air pressure in the energy storage device is increased, the baffle plate is pushed to move towards one side of the first metal sheet, so that the percussion piece is driven to impact the first metal sheet, the voltage excitation piece between the first metal sheet and the second metal sheet generates voltage, the voltage excitation piece is simple in internal structure and easy to generate voltage, and manufacturing cost is reduced.
With reference to the first aspect, in one possible implementation manner, the energy storage device further includes a first connection piece and a second connection piece, where the first connection piece and the second connection piece are both contained in the housing, the positive electrode post is electrically connected with the electrode assembly through the first connection piece, the negative electrode post is electrically connected with the electrode assembly through the second connection piece, one end of the voltage exciter is electrically connected with the first connection piece, and the other end of the voltage exciter is electrically connected with the second connection piece.
Compared with the direct electrical connection of the voltage exciter with the positive pole and the negative pole, the length of the electric wire between the voltage exciter and the positive pole and the negative pole is shortened, the wiring inside the energy storage device is reduced, and the production cost is reduced.
With reference to the first aspect, in one possible implementation manner, the first connection piece, the voltage exciter, and the second connection piece are sequentially arranged along a length direction of the energy storage device.
Along the length direction of energy memory, the voltage exciter sets up between first connection piece and second connection piece, on the one hand reduces the wiring between voltage exciter and first connection piece, the second connection piece, on the other hand, sets up the voltage exciter between first connection piece and second connection piece to make full use of the surplus space between first connection piece and the second connection piece reduces the occupation space of voltage exciter in the casing, thereby guarantees energy density of energy memory.
In a second aspect, the present application further provides a powered device, which includes an energy storage device according to any implementation manner of the first aspect, where the energy storage device supplies power to the powered device.
According to the electric equipment, the voltage exciter is arranged in the shell and is electrically connected between the positive pole and the negative pole, when a large amount of gas generated by the energy storage device in the overcharging process enables the pressure inside the shell to reach a certain threshold value, the voltage exciter is triggered to collide and deform to generate exciting voltage, and the exciting voltage is larger than or equal to the overcharging pressure threshold value of the energy storage device, so that the energy storage device reaches the overcharging pressure threshold value in advance to stop charging, the overcharging time is shortened to be before the explosion-proof valve is opened, the overcharging process is greatly shortened, the problem of insufficient safety of the material and design level of the electrode assembly is solved, the continuous input of energy and the continuous deterioration of temperature and side reaction are reduced, and the overcharging problem of the energy storage device is effectively improved; in addition, the voltage exciter is directly connected with the positive pole and the negative pole, and when the voltage exciter is triggered, a voltage signal can be given to the BMS of the energy storage device, so that the BMS stops charging the energy storage device; the trigger of voltage trigger has simulated energy memory and has reached the overcharge voltage threshold value, and then triggers BMS and stop the condition that continues to charge, and whole control process does not have extra detection element, and need not to change current BMS control logic for energy memory system overall cost at energy memory place reduces, and the security performance promotes.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below.
Fig. 1 is a schematic perspective view of an energy storage device according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a partially exploded structure of an energy storage device according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an overcharging process curve of an energy storage device according to the prior art;
FIG. 4 is a schematic diagram of an overcharge process curve of an energy storage device according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a voltage exciter in an energy storage device according to an embodiment of the present disclosure;
fig. 6 is a schematic partial perspective view of an energy storage device according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a connection voltage exciter between a first connection piece and a second connection piece in an energy storage device according to an embodiment of the present disclosure.
Reference numerals illustrate:
the electrode comprises a shell body-10, an electrode assembly-20, a top cover-30, a mounting groove-31, an explosion-proof hole-32, an explosion-proof valve-40, a positive pole column-50 a, a negative pole column-50 b, a voltage exciter-60, a shell-61, a first metal sheet-62 a, a second metal sheet-62 b, a first elastic piece-63 a, a second elastic piece-63 b, a percussion piece-64, a baffle piece-65, a voltage exciter-66, a resistor-67, an upper plastic cement-70, a sealing ring-80, a lower plastic cement-90, a cavity-91, a first connecting piece-100 a, a second connecting piece-100 b and an energy storage device-1000.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. Directional terms referred to herein, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are merely directions referring to the attached drawings, and thus, directional terms are used for better, more clear description and understanding of the present application, rather than indicating or implying that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the numbering of the components itself, e.g., "first," "second," etc., herein is merely used to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
Referring to fig. 1, fig. 1 is a schematic perspective view of an energy storage device 1000 according to an embodiment of the disclosure. The application provides an electric equipment, and the electric equipment includes the energy storage device 1000 that this application provided, and energy storage device 1000 is the electric equipment power supply.
The energy storage device 1000 may be used to store electrical energy for powering electrical consumers during peak electricity prices or for powering electrical power down/off.
The number of the energy storage devices 1000 may be several, and the several energy storage devices 1000 are connected in series or parallel, and the several energy storage devices 1000 are supported and electrically connected by using a separator (not shown). In this embodiment, "a plurality of" means two or more. An energy storage tank may be further disposed outside the energy storage device 1000, for accommodating the energy storage device 1000.
It is understood that the energy storage device 1000 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, etc. The practical application form of the energy storage device 1000 provided in the embodiment of the present application may be, but is not limited to, the listed products, and may also be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 1000. In the embodiment of the present application, the energy storage device 1000 is only taken as a battery for illustration.
The electric equipment provided by the application comprises, but is not limited to, electric equipment such as a power grid, a base station and the like.
Referring to fig. 2, fig. 2 is a schematic partially exploded structure of an energy storage device 1000 according to an embodiment of the disclosure. The energy storage device 1000 of this application includes casing 10, top cap 30, electrode assembly 20, anodal post 50a, negative pole post 50b and voltage excitation ware 60, electrode assembly 20 and voltage excitation ware 60 all hold in the casing, top cap 30 lid closes in the casing, be provided with explosion-proof valve 40 on the top cap 30, anodal post 50a and negative pole post 50b are installed on top cap 30, anodal post 50a and negative pole post 50b all wear to establish top cap 30 and electrode assembly 20 electricity and are connected, the one end electricity of voltage excitation ware 60 is connected in anodal post 50a, the other end electricity of voltage excitation ware 60 is connected in negative pole post 50b, voltage excitation ware 60 can take place deformation in order to produce excitation voltage, excitation voltage is greater than or equal to energy storage device 1000's overcharge voltage threshold value.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating an overcharging process curve of an energy storage device 1000 according to the prior art. In general, when the pressure in the energy storage device 1000 reaches 0.6-0.8MPa, the explosion-proof valve 40 is opened to spray out electrolyte, and the side reaction gas is simultaneously diffused from the explosion-proof valve 40 to release heat and pressure in the energy storage device 1000. As shown in fig. 2, after the energy storage device 1000 is opened, the energy storage device 1000 is overcharged and still not reaches the overcharged voltage threshold, and the energy storage device 1000 continues to be overcharged for a period of time until the voltage reaches the overcharged voltage threshold, and then stops charging.
The overcharge voltage threshold of the energy storage device 1000 is an overcharge cutoff condition of the energy storage device 1000, for example, the overcharge cutoff condition of the energy storage device 1000 may be that the energy storage device 1000 is overcharged to 5.475V or the voltage protection threshold of the BMS of the module is reached. Before an overcharge cutoff condition of the energy storage device 1000, an overcharge stage of the energy storage device 1000; after the overcharge cutoff condition of the energy storage device 1000, the energy storage device 1000 is in a rest phase of the energy storage device 1000, and the energy storage device 1000 stops charging in the rest phase of the energy storage device 1000.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating an overcharging process curve of the energy storage device 1000 according to an embodiment of the disclosure. In the method, the voltage exciter 60 is arranged in the shell, the voltage exciter 60 is electrically connected between the positive pole 50a and the negative pole 50b, when a large amount of gas generated in the overcharging process of the energy storage device 1000 enables the pressure in the shell to reach a certain threshold value, the voltage exciter 60 is triggered to collide and deform to generate exciting voltage, and the exciting voltage is larger than or equal to the overcharging voltage threshold value of the energy storage device 1000, so that the energy storage device 1000 reaches the overcharging voltage threshold value in advance to stop charging, the overcharging process is greatly shortened before the overcharging time is shortened to the time when the explosion-proof valve 40 is opened, the problems of insufficient safety of the material and design level of the electrode assembly 20 in the energy storage device 1000 are solved, the continuous input of energy and the continuous deterioration of temperature and side reaction are reduced, and the overcharging problem of the energy storage device 1000 is effectively improved; in addition, the voltage exciter 60 is directly connected with the positive pole 50a and the negative pole 50b, and can provide a voltage signal for the BMS of the energy storage device 1000 when triggered, so that the BMS stops charging the energy storage device 1000; the triggering of the voltage trigger 60 simulates the condition that the energy storage device 1000 reaches the overcharge voltage threshold value, and then triggers the BMS to stop continuing charging, the whole control process does not additionally increase the detection unit, and the existing BMS control logic is not required to be changed, so that the overall cost of the energy storage system where the energy storage device 1000 is located is reduced, and the safety performance is improved.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a voltage exciter 60 in an energy storage device 1000 according to an embodiment of the disclosure. As shown in fig. 5, the voltage generator 60 includes a housing 61, a first metal plate 62a, a second metal plate 62b, a first elastic member 63a, a second elastic member 63b, a click member 64, a stopper 65, and a voltage generator 66. The casing 61 accommodates a first metal piece 62a, a second metal piece 62b, an elastic member, a click member 64, a blocking piece 65, and a voltage excitation member 66, the first metal piece 62a and the second metal piece 62b are provided on surfaces of opposite sides of the voltage excitation member 66, the first metal piece 62a can be connected to the positive electrode through a wire, and the second metal piece 62b can be connected to the negative electrode through a wire. The click piece 64 is disposed opposite to the first metal piece 62a and is located between the first metal piece 62a and the stopper piece 65. The tapping member 64 is elastically connected between the blocking piece 65 and a side wall of the housing 61, and the blocking piece 65 is capable of moving to drive the tapping member 64 to strike the first metal piece 62a or to be away from the first metal piece 62a. For example, one end of the first elastic member 63a is fixed to the inner wall surface of the housing 61, the other end of the first elastic member 63a is fixed to the click member 64, one end of the second elastic member 63b is fixed to the click member 64, and the other end of the second elastic member 63b is fixed to the stopper 65. The flap 65 is movable under the action of an external force.
The percussion member 64 is elastically connected between the baffle plate 65 and a side wall of the housing 61, when the air pressure in the energy storage device 1000 increases, the baffle plate 65 is pushed to move towards one side of the first metal sheet 62a, so that the percussion member 64 is driven to strike the first metal sheet 62a, the voltage excitation member 66 between the first metal sheet 62a and the second metal sheet 62b generates voltage, the internal structure of the voltage exciter 60 is simple, the voltage is easy to generate, and the manufacturing cost is reduced.
For example, when the air pressure inside the energy storage device 1000 acts on the blocking piece 65, the blocking piece 65 moves to compress the second elastic member 63b, and the second elastic member 63b pushes the tapping member 64 to move toward the first metal plate 62a side, and at the same time, the tapping member 64 compresses the second elastic member 63b. When the tapping member 64 strikes the first metal plate 62a, a polarization reaction occurs inside the voltage excitation member 66, generating a voltage. When the air pressure inside the energy storage device 1000 is reduced, the first elastic member 63a and the second elastic member 63b recover the elastic deformation, so that the tapping member 64 is far away from the first metal sheet 62a, and the generation of the voltage is stopped.
In this application, voltage exciter 60 triggers through the inside atmospheric pressure of energy memory 1000, and after the inside atmospheric pressure of energy memory 1000 reached certain threshold value, voltage exciter 60 produced excitation voltage for energy memory 1000 can reach the overcharge voltage threshold value in advance, in time stops charging, reduces the condition such as energy memory 1000 overcharge open valve, thermal runaway, fire. And the present application does not require shortening the overcharge time by improving the material level of the electrode assembly 20, thereby improving the overcharge safety.
The voltage excitation member 66 is made of piezoelectric material including, but not limited to, crystalline piezoelectric material, ceramic piezoelectric material, and polymeric piezoelectric material or liquid piezoelectric material.
For example, the piezoelectric material is a ceramic piezoelectric material, the ceramic piezoelectric material can convert mechanical energy into electric energy, a certain acting force is applied to the ceramic piezoelectric material, the ceramic piezoelectric material is polarized, and a voltage is generated, wherein the voltage is related to the property, the dimension and the deformation of the ceramic piezoelectric material, and the voltage is obtained through the following formula I.
Equation one: v (V) Pressing =F*d33/Cd
Wherein "V Pressing "voltage generated by the ceramic piezoelectric material," d33 "represents a longitudinal piezoelectric strain constant of the ceramic piezoelectric material under the positive piezoelectric effect," Cd "represents a capacitance of the ceramic piezoelectric material, and" F "represents a force applied to the ceramic piezoelectric material.
Illustratively, voltage regulator 60 further includes a resistor 67, voltage regulator 66 being connected in series with resistor 67, voltage regulator 66 and resistor 67 being electrically connected between positive and negative posts 50a and 50 b.
By additionally arranging the resistor 67, the resistor 67 is connected with the voltage excitation piece 66 in series, so that the voltage between the positive pole 50a and the negative pole 50b is reduced, the voltage division effect is realized, and the excitation voltage generated by the voltage exciter 60 is prevented from being overlarge, so that the service life of the energy storage device 1000 is prevented from being influenced.
Illustratively, the voltage excitation member 66 has a first resistance value R1 when turned on, the voltage excitation member 66 is deformed to generate a first voltage value V1, the resistor 67 has a second resistance value R2, and the second resistance value R2 of the resistor 67 satisfies: r2> 5.475R 1/V1-R1.
Wherein, when the resistor 67 is connected in series with the voltage excitation member 66, the voltage V across the positive and negative electrode posts 50a and 50b is at the moment of excitation by the voltage excitation member 60 Total (S) =r=i= (r1+r2) ×i, where "I" is the current in the loop, i.e. the current flowing through the voltage excitation element 66, V Total (S) Equal to the excitation voltage, V, generated by the voltage exciter 60 Total (S) >5.475V and 5.475V are the voltage values achieved by overcharging of the national standard GBT36276, and meet the national safety standard. Voltage V across positive post 50a and negative post 50b Total (S) =（R1+R2）*V1/R1>5.475V, R2>5.475×R1/V1-R1, the first voltage V1 can be calculated according to the above formula one.
The second resistance value R2 by setting the resistor 67 satisfies: r2> 5.475R 1/V1-R1, so that the divided voltage of the resistor 67 is large enough to reduce the influence of the voltage exciter 60 on the energy storage device 1000, and reduce the possibility of damaging the energy storage device 1000 due to excessive voltage between the positive and negative poles of the energy storage device 1000.
Illustratively, the energy storage device 1000 further includes an upper plastic 70 and a sealing ring 80, wherein the upper plastic 70 is sleeved on the positive electrode post 50a and the negative electrode post 50b, and the upper plastic 70 is located on a surface of the top cover 30 facing away from the electrode assembly 20, so as to insulate and protect the top cover 30 from the positive electrode post 50a and the top cover 30 from the negative electrode post 50 b.
Sealing rings 80 are respectively arranged between the positive electrode column 50a and the top cover 30 and between the negative electrode column 50b and the top cover 30, and sealing performance between the top cover 30 and the positive electrode column 50a and between the top cover 30 and the negative electrode column 50b is enhanced through the sealing rings 80.
For example, the top cover 30 may be provided with a mounting groove 31, and the sealing ring 80 is accommodated in the mounting groove 31, so as to ensure the stability of the installation of the sealing ring 80, reduce the falling of the sealing ring 80 relative to the positive electrode post 50a or the negative electrode post 50b, and ensure the sealing performance between the positive electrode post 50a and the top cover 30 and between the negative electrode post 50b and the top cover 30.
Referring to fig. 6, fig. 6 is a schematic partial perspective view of an energy storage device 1000 according to an embodiment of the disclosure. Illustratively, the energy storage device 1000 further includes a lower plastic 90, wherein the lower plastic 90 is stacked with the top cover 30 along the height direction of the energy storage device 1000, the lower plastic 90 is mounted on the side of the top cover 30 facing the electrode assembly 20, and the voltage exciter 60 is mounted on the surface of the side of the lower plastic 90 facing the electrode assembly 20.
Along the height direction of the energy storage device 1000, the voltage exciter 60 may be fixedly connected to the surface of the lower plastic 90 facing the electrode assembly 20, so as to reduce or prevent the voltage exciter 60 from falling onto the electrode assembly 20, thereby affecting the normal use of the electrode assembly 20.
Along the direction of height of energy storage device 1000, install voltage exciter 60 on the surface of lower plastic 90 towards electrode assembly 20 one side for energy storage device 1000 overcharge in-process produced gas can produce the striking to voltage exciter 60, make voltage exciter 60 can take place deformation and produce excitation voltage, simultaneously, top cap 30, lower plastic 90 and voltage exciter 60 set gradually in the direction of height of energy storage device 1000, guarantee the insulativity between voltage exciter 60 and the top cap 30, ensure that voltage exciter 60 can not be connected with top cap 30 electricity in the use, reduce or avoid the phenomenon that the inside appears short circuit.
Illustratively, the top cover 30 is provided with a explosion-proof hole 32, the explosion-proof valve 40 is mounted on the explosion-proof hole 32, the lower plastic 90 is formed with a cavity 91, the cavity 91 is communicated with the interior of the housing, and the cavity 91 is arranged opposite to the explosion-proof hole 32 along the height direction of the energy storage device 1000; the voltage energizer 60 is mounted on the outer wall surface of the chamber 91 on the side facing the electrode assembly 20.
The voltage exciter 60 is installed on the outer wall surface of the chamber 91 facing the electrode assembly 20, and the pressure of the gas generated by the energy storage device 1000 in the overcharging process is high at the chamber 91, so that the voltage exciter 60 is easier to excite, the overcharging time can be greatly shortened, and the problem of the overcharging safety can be effectively solved.
The arrangement of the chamber 91 concentrates the electrolyte splashed back in the overcharging process of the energy storage device 1000 in the chamber 91, prevents the electrolyte splashed back from corroding the explosion-proof valve 40, and ensures the reliability of the explosion-proof valve 40.
Illustratively, resistor 67 and voltage trigger 66 are disposed at intervals on the outer wall surface of chamber 91 on the side facing electrode assembly 20, with explosion-proof holes 32, resistor 67 and voltage trigger 66 being offset.
The resistor 67 and the voltage excitation member 66 are arranged on the outer wall surface of the chamber 91 facing the electrode assembly 20 at intervals, and gas generated in the overcharging process of the energy storage device 1000 can flow to the explosion-proof hole 32 through the chamber 91, so that the valve of the energy storage device 1000 can be smoothly opened under the condition that the air pressure in the shell is extreme, and explosion phenomenon of the energy storage device 1000 is prevented.
Referring to fig. 1 and fig. 7, fig. 7 is a schematic structural diagram of a connection voltage exciter 60 between a first connection piece 100a and a second connection piece 100b in an energy storage device 1000 according to an embodiment of the disclosure. Illustratively, the energy storage device 1000 further includes a first connecting piece 100a and a second connecting piece 100b, wherein the first connecting piece 100a and the second connecting piece 100b are both accommodated in the housing, the positive electrode post 50a is electrically connected with the electrode assembly 20 through the first connecting piece 100a, the negative electrode post 50b is electrically connected with the electrode assembly 20 through the second connecting piece 100b, one end of the voltage exciter 60 is electrically connected with the first connecting piece 100a, and the other end of the voltage exciter 60 is electrically connected with the second connecting piece 100 b.
On a plane perpendicular to the height direction of the first connection piece 100a, the orthographic projection of the first connection piece 100a has a "U" shape, and it is understood that the structure of the first connection piece 100a is the same as that of the second connection piece 100 b.
Compared with the direct electrical connection of the voltage exciter 60 with the positive electrode post 50a and the negative electrode post 50b, the length of the electric wire between the voltage exciter 60 and the positive electrode post 50b is shortened, the wiring inside the energy storage device 1000 is reduced, and the production cost is reduced.
Illustratively, the positive electrode tab 50a is provided protruding on a surface of the first connecting tab 100a facing away from the electrode assembly 20, and the first connecting tab 100a is integrally formed with the positive electrode tab 50 a.
The positive pole 50a and the first connecting piece 100a are integrated into a whole, so that the welding procedure of the positive pole 50a and the first connecting piece 100a is reduced, the integration level is improved, the production efficiency and the high-quality rate are improved, and the production cost is reduced.
Illustratively, the negative electrode post 50b is disposed on a surface of the second connecting piece 100b facing away from the electrode assembly 20, and the second connecting piece 100b is integrally formed with the negative electrode post 50 b.
The negative pole post 50b and the second connecting sheet 100b are integrated into a whole, so that the welding procedure of the negative pole post 50b and the second connecting sheet 100b is reduced, the integration level is improved, the production efficiency and the high-quality rate are improved, and the production cost is reduced.
Illustratively, the first connection piece 100a, the voltage exciter 60, and the second connection piece 100b are arranged in this order along the length of the energy storage device 1000.
Along the length direction of the energy storage device 1000, the voltage exciter 60 is disposed between the first connection sheet 100a and the second connection sheet 100b, on one hand, wiring between the voltage exciter 60 and the first connection sheet 100a and the second connection sheet 100b is reduced, and on the other hand, the voltage exciter 60 is disposed between the first connection sheet 100a and the second connection sheet 100b, so that the remaining space between the first connection sheet 100a and the second connection sheet 100b is fully utilized, and the occupied space of the voltage exciter 60 in the housing is reduced, thereby ensuring the energy density of the energy storage device 1000.
The foregoing is a partial embodiment of the present application and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.
Claims (10)
1. The utility model provides an energy storage device, its characterized in that includes casing, top cap, electrode assembly, positive pole, negative pole post and voltage exciter, electrode assembly with voltage exciter all holds in the casing, the top cap lid in the casing, be provided with explosion-proof valve on the top cap, positive pole with the negative pole post is installed on the top cap, positive pole with the negative pole post is all worn to establish the top cap with electrode assembly electricity is connected, voltage exciter's one end electricity is connected in positive pole, voltage exciter's the other end electricity is connected in negative pole post, voltage exciter can take place deformation in order to produce excitation voltage, excitation voltage is greater than or equal to energy storage device's overcharge voltage threshold value.
2. The energy storage device of claim 1, further comprising a lower plastic, the lower plastic being laminated with the top cover along a height direction of the energy storage device, the lower plastic being mounted on a side of the top cover facing the electrode assembly, the voltage exciter being mounted on a surface of the lower plastic facing the electrode assembly.
3. The energy storage device according to claim 2, wherein the top cover is provided with an explosion-proof hole, the explosion-proof valve is mounted in the explosion-proof hole, the lower plastic is formed with a cavity, the cavity is communicated with the inside of the shell, and the cavity is arranged opposite to the explosion-proof hole along the height direction of the energy storage device; the voltage exciter is arranged on the outer wall surface of the chamber on the side facing the electrode assembly.
4. The energy storage device of claim 3, wherein the voltage energizer comprises a voltage energizer and a resistor, the voltage energizer being connected in series with the resistor, the voltage energizer and the resistor being electrically connected between the positive and negative posts.
5. The energy storage device of claim 4, wherein the resistor and the voltage excitation member are disposed at intervals on an outer wall surface of the chamber on a side facing the electrode assembly, and the explosion-proof hole, the resistor and the voltage excitation member are disposed in a staggered manner.
6. The energy storage device of claim 5, wherein said voltage excitation member has a first resistance value R1 when turned on, said voltage excitation member is deformed to produce a first voltage value V1, said resistor has a second resistance value R2, and said second resistance value R2 of said resistor satisfies: r2> 5.475R 1/V1-R1.
7. The energy storage device of claim 4, wherein the voltage exciter comprises a housing, a first metal sheet, a second metal sheet, a tapping member and a baffle, wherein the first metal sheet, the second metal sheet, the tapping member and the baffle are all contained in the housing, the first metal sheet and the second metal sheet are arranged on the surfaces of two opposite sides of the voltage exciter, the tapping member is arranged opposite to the first metal sheet, the tapping member is elastically connected between the baffle and a side wall of the housing, and the baffle can move to drive the tapping member to impact the first metal sheet or be far away from the first metal sheet.
8. The energy storage device of claim 1, further comprising a first connecting tab and a second connecting tab, wherein the first connecting tab and the second connecting tab are both housed in the housing, wherein the positive post is electrically connected to the electrode assembly through the first connecting tab, wherein the negative post is electrically connected to the electrode assembly through the second connecting tab, wherein one end of the voltage stimulator is electrically connected to the first connecting tab, and wherein the other end of the voltage stimulator is electrically connected to the second connecting tab.
9. The energy storage device of claim 8, wherein the first connecting tab, the voltage exciter, and the second connecting tab are arranged in sequence along a length of the energy storage device.
10. A powered device comprising an energy storage device as claimed in any one of claims 1 to 9, said energy storage device powering said powered device.
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008258110A (en) * | 2007-04-09 | 2008-10-23 | Matsushita Electric Ind Co Ltd | Battery pack |
| CN203039012U (en) * | 2012-11-29 | 2013-07-03 | 宁德时代新能源科技有限公司 | Safety device preventing overcharge |
| JP2014036006A (en) * | 2012-08-10 | 2014-02-24 | Nippon Soken Inc | Lithium ion secondary battery |
| CN104617644A (en) * | 2013-11-04 | 2015-05-13 | 深圳市海洋王照明工程有限公司 | Charging circuit |
| CN104810884A (en) * | 2015-04-07 | 2015-07-29 | 江华 | Electric vehicle charging control system |
| CN206099420U (en) * | 2016-09-20 | 2017-04-12 | 温上震 | Overcharge and prevent device |
| JP2017098149A (en) * | 2015-11-26 | 2017-06-01 | 株式会社豊田自動織機 | Electricity storage device |
| CN106816660A (en) * | 2015-11-27 | 2017-06-09 | 丰田自动车株式会社 | all solid state secondary battery system |
| CN206505970U (en) * | 2017-02-17 | 2017-09-19 | 厦门金龙旅行车有限公司 | A kind of thermal runaway early detection system for power car electrokinetic cell |
| US20190334156A1 (en) * | 2016-08-01 | 2019-10-31 | Johnson Controls Technology Company | Overcharge protection assembly for a battery cell |
| CN113418651A (en) * | 2021-05-20 | 2021-09-21 | 同济大学 | Method and structure for detecting internal pressure of lithium ion power battery based on piezoelectric sensing |
| CN114696048A (en) * | 2021-06-21 | 2022-07-01 | 宁波大学 | A lithium-ion battery assembly and battery management system |
| CN116014382A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
| CN116365129A (en) * | 2023-05-31 | 2023-06-30 | 深圳海辰储能控制技术有限公司 | End cover assembly, energy storage device and electric equipment |
-
2024
- 2024-03-05 CN CN202410245747.7A patent/CN117855641B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008258110A (en) * | 2007-04-09 | 2008-10-23 | Matsushita Electric Ind Co Ltd | Battery pack |
| JP2014036006A (en) * | 2012-08-10 | 2014-02-24 | Nippon Soken Inc | Lithium ion secondary battery |
| CN203039012U (en) * | 2012-11-29 | 2013-07-03 | 宁德时代新能源科技有限公司 | Safety device preventing overcharge |
| CN104617644A (en) * | 2013-11-04 | 2015-05-13 | 深圳市海洋王照明工程有限公司 | Charging circuit |
| CN104810884A (en) * | 2015-04-07 | 2015-07-29 | 江华 | Electric vehicle charging control system |
| JP2017098149A (en) * | 2015-11-26 | 2017-06-01 | 株式会社豊田自動織機 | Electricity storage device |
| CN106816660A (en) * | 2015-11-27 | 2017-06-09 | 丰田自动车株式会社 | all solid state secondary battery system |
| US20190334156A1 (en) * | 2016-08-01 | 2019-10-31 | Johnson Controls Technology Company | Overcharge protection assembly for a battery cell |
| CN116845475A (en) * | 2016-08-01 | 2023-10-03 | Cps 科技控股有限公司 | Overcharge protection assembly for battery cell |
| CN206099420U (en) * | 2016-09-20 | 2017-04-12 | 温上震 | Overcharge and prevent device |
| CN206505970U (en) * | 2017-02-17 | 2017-09-19 | 厦门金龙旅行车有限公司 | A kind of thermal runaway early detection system for power car electrokinetic cell |
| CN113418651A (en) * | 2021-05-20 | 2021-09-21 | 同济大学 | Method and structure for detecting internal pressure of lithium ion power battery based on piezoelectric sensing |
| CN114696048A (en) * | 2021-06-21 | 2022-07-01 | 宁波大学 | A lithium-ion battery assembly and battery management system |
| CN116014382A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
| CN116365129A (en) * | 2023-05-31 | 2023-06-30 | 深圳海辰储能控制技术有限公司 | End cover assembly, energy storage device and electric equipment |
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|---|---|
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