Energy storage device and electric equipment

Abstract

The utility model discloses an energy storage device and electric equipment, and relates to the technical field of energy storage. The energy storage device comprises a box body which comprises a plurality of accommodating cavities with first openings; the side wall of each electrode assembly is provided with a fixing frame, each electrode assembly is contained in the corresponding containing cavity, and the fixing frames divide the annular gaps between the electrode assemblies and the corresponding containing cavities into a plurality of cavities in the depth direction of the containing cavities; the first end cover assembly comprises a plurality of first end cover units, and each first end cover unit seals the first opening of the corresponding containing cavity. In the embodiment of the invention, the fixing frame is arranged on the side wall of the electrode assembly, so that the side wall of the electrode assembly can be prevented from being scratched with the opening edge of the accommodating cavity through the fixing frame, and the yield of the energy storage device is ensured; besides, the moving space of the electrode assembly can be reduced or even avoided through the fixing frame, shaking of the energy storage device when the energy storage device is subjected to external force is avoided, and therefore the service life of the energy storage device is prolonged, and safety is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage device and electrical equipment. Background Art

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to activate the active materials after being discharged and continue to be used. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people's requirements for their performance in all aspects are also getting higher and higher, especially the requirements for battery life.

[0003] In the related art, secondary batteries are usually composed of an end cap unit, an electrode assembly and a shell. The actual production process is to make the end cap unit, the electrode assembly and the shell separately, and then use metal adapters to weld the electrode column of the end cap unit and the electrode lug of the electrode assembly respectively, and then put the electrode assembly into the shell, and then cover the opening of the shell with the end cap unit and weld and seal it to form the basic structure of the secondary battery. After that, the electrolyte is added through the injection hole set on the top cover by manual injection, and the injection hole is welded and sealed after completion.

[0004] As the demand for energy density becomes higher and higher, electrode assemblies are made longer. However, when longer electrode assemblies are installed in the shell, they are prone to tilting, causing friction with the shell wall, resulting in damage to the electrode assemblies. In addition, when external forces such as vibration occur, the electrode assemblies are also prone to shaking, thereby increasing safety hazards. Utility Model Content

[0005] A main purpose of the present application is to provide an energy storage device and electrical equipment that can ensure the yield of the energy storage device and the safety of use.

[0006] In order to achieve the above application purpose, this application adopts the following technical solutions:

[0007] According to one aspect of the present application, there is provided an energy storage device, comprising:

[0008] The box body comprises a plurality of accommodating cavities distributed in an array and having a first opening;

[0009] A plurality of electrode assemblies corresponding to the plurality of accommodating cavities one by one, a fixing frame is provided on the side wall of the electrode assembly along the circumferential direction, each of the electrode assemblies is accommodated in the corresponding accommodating cavity, and the fixing frame separates the annular gap between the electrode assembly and the corresponding accommodating cavity into a plurality of chambers in the depth direction of the accommodating cavity;

[0010] The first end cover assembly includes a plurality of first end cover units corresponding to the plurality of accommodating cavities one by one, and each of the first end cover units seals a first opening of a corresponding accommodating cavity.

[0011] In the implementation mode of the present application, a fixing frame is provided on the side wall of the electrode assembly, so that when the electrode assembly is loaded into the corresponding receiving cavity, the fixing frame can be used to prevent the side wall of the electrode assembly from being scratched against the opening edge of the receiving cavity, thereby ensuring the yield of the energy storage device; in addition, after the electrode assembly is loaded into the corresponding receiving cavity, the fixing frame can be used to reduce or even prevent the activity space of the electrode assembly in the receiving cavity, thereby preventing the energy storage device from shaking when subjected to external force, thereby preventing the connection between the electrode assembly and the first end cover unit from becoming loose, thereby extending the service life of the energy storage device and ensuring safety.

[0012] According to one embodiment of the present application, the cavity wall of the accommodating cavity has a first guide mechanism extending along the depth direction, the fixing frame has a second guide mechanism, the first guide mechanism cooperates with the corresponding second guide mechanism, and is used to limit the center line of the electrode assembly to be parallel to the depth direction of the corresponding accommodating cavity.

[0013] In the implementation manner of the present application, the first guiding mechanism and the second guiding mechanism can be provided to facilitate ensuring that the center line of the electrode assembly is parallel to the depth direction of the accommodating cavity when the electrode assembly is loaded into the accommodating cavity.

[0014] According to one embodiment of the present application, the first guide mechanism is a guide groove, and the second guide mechanism is a strip-shaped protrusion.

[0015] In the embodiment of the present application, when the first guide mechanism is a guide groove, it is convenient to increase the cross-sectional area of ​​the chambers on both sides of the fixing frame, thereby facilitating improving the circulation efficiency of the electrolyte and the high-temperature gas.

[0016] According to an embodiment of the present application, a side wall of the electrode assembly is provided with a plurality of the fixing frames spaced apart and distributed along the depth direction.

[0017] According to an embodiment of the present application, the accommodating cavity penetrates the box body in the depth direction;

[0018] The energy storage device further comprises a second end cap assembly, which seals the second openings of the plurality of accommodating cavities.

[0019] According to one embodiment of the present application, the first end cover unit includes a cover plate and an insulating member, the insulating member is located between the cover plate and the first open end surface of the corresponding accommodating cavity, and the cover plate is fixedly connected to the box body.

[0020] According to an embodiment of the present application, the first end cover assembly further comprises a pressing plate, the pressing plate has a plurality of sinking grooves, and the bottom of the sinking grooves has a hollow area;

[0021] The plurality of sink grooves correspond one-to-one to the plurality of cover plates, the pressure plate is crimped on the plurality of cover plates and fixedly connected to the box body, each cover plate is limited in the corresponding sink groove, and a partial area of ​​each cover plate is exposed at the corresponding hollow area.

[0022] In the implementation manner of the present application, multiple cover plates can be synchronously fixed by a pressure plate to simplify the assembly of the energy storage device. At the same time, when the cover plate is limited in the corresponding sink groove, the cover plate can be limited to avoid displacement of the cover plate, thereby ensuring the sealing effect of the cover plate on the accommodating cavity.

[0023] According to an embodiment of the present application, the box body further has a plurality of cooling cavities that are alternately distributed with the accommodating cavities in the arrangement direction of the plurality of accommodating cavities;

[0024] The first opening of the cooling cavity and the first opening of the accommodating cavity are located on the same side of the box body, and the pressing plate seals the first openings of the cooling cavities.

[0025] In the embodiment of the present application, after the electrode assembly is assembled in the accommodating cavity, the coolant can be injected along the first opening of the cooling cavity, and then the accommodating cavity and the cooling cavity can be sealed synchronously by the pressing plate, so as to facilitate the assembly of the energy storage device. In combination with the above, the pressing plate is provided with a sink groove, so that when the pressing plate is buckled on the cover plate, it can ensure that the pressing plate is directly attached to the first opening end face of the cooling cavity, so as to achieve the sealing of the cooling cavity.

[0026] According to one embodiment of the present application, the first end cover assembly also includes a first sealing ring, which is located between the first opening end surface of the cooling cavity and the pressure plate, and the first openings of the plurality of cooling cavities and the first openings of the plurality of accommodating cavities are all located in the area surrounded by the first sealing ring.

[0027] According to one embodiment of the present application, the cooling cavity penetrates the box body in the depth direction, and the box body has a sink located on the second opening end surface of the cooling cavity;

[0028] The energy storage device further includes a second end cover assembly, the sink is connected to a plurality of second openings of the cooling chambers, and the second end cover assembly seals the sink and the plurality of second openings of the cooling chambers.

[0029] In the embodiment of the present application, a sink is provided to connect multiple cooling cavities, so that coolant can be injected into the multiple cooling cavities simultaneously along the first opening of any cooling cavity, thereby simplifying the injection operation and improving the injection efficiency.

[0030] According to one aspect of the present application, an electric device is provided, the electric device comprising the energy storage device described in the above aspect, the energy storage device supplies power to the electric device.

[0031] In the embodiments of the present application, in combination with the above, during use, the electrical equipment of the present application can improve the working stability of the electrical equipment based on the high energy density of the energy storage device, and at the same time improve the working safety of the electrical equipment based on the stability of the electrode assembly.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0034] Figure 1 is a schematic structural diagram of a household energy storage system according to an exemplary embodiment.

[0035] Figure 2 is a schematic diagram of an exploded structure of an energy storage device according to an exemplary embodiment.

[0036] Figure 3 Example Figure 2 A schematic diagram of the local enlarged structure of area B is shown.

[0037] Figure 4 Example Figure 2 A schematic diagram of the local enlarged structure of area A is shown.

[0038] Figure 5 is a schematic diagram of an exploded structure of an energy storage device according to an exemplary embodiment.

[0039] Figure 6 Example Figure 5 A schematic diagram of the local enlarged structure of area B is shown.

[0040] Figure 7 Example Figure 5 A schematic diagram of the local enlarged structure of area A is shown.

[0041] Figure 8 It is a schematic structural diagram of an electric device according to an exemplary embodiment.

[0042] The reference numerals are described as follows:

[0043] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment;

[0044] 10. Box body; 20. Electrode assembly; 30. First end cap assembly; 40. Second end cap assembly;

[0045] 11. Accommodating cavity; 12. Guide groove; 13. Cooling cavity; 14. Sinking groove; 15. Mounting ear plate; 16. Mounting hole;

[0046] 21. Fixing frame; 22. Positive electrode ear; 23. Negative electrode ear;

[0047] 211, strip-shaped protrusions;

[0048] 31. first end cover unit; 32. pressing plate; 33. first sealing ring; 34. third sealing ring;

[0049] 311, cover plate; 312, positive terminal; 313, negative terminal; 314, injection hole; 315, explosion-proof valve;

[0050] 321, sinking groove; 322, hollow area;

[0051] 41. Packaging plate; 42. Second sealing ring; 43. Fourth sealing ring. DETAILED DESCRIPTION

[0052] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0053] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same way or convert it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0054] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0055] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0056] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0057] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0058] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0059] Take the household energy storage scenario in user-side energy storage as an example to illustrate. Figure 1 A household energy storage system is shown, which includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, household appliances, etc.). The energy storage device 100 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy during the period of low electricity prices, and store it through the energy storage device 100, and then supply the user load 300 for use during the peak electricity price, or supply the user load 300 for use when the power grid is off / power outage.

[0060] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 100 includes at least one chemical battery, using the chemical elements in the chemical battery as the energy storage medium, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where the electric energy is scarce for use.

[0061] The embodiment of the present application provides an energy storage device, which may be, but is not limited to, a battery pack, a battery box, etc. composed of single cells. The single cell may be a lithium ion battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc. The single cell may be cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this.

[0062] Figure 2 An exploded structural diagram of an energy storage device 100 provided in an embodiment of the present application is illustrated. Figure 3 Example Figure 2 The local enlarged structural diagram of area A is shown. Figure 4 Example Figure 2 The schematic diagram of the local enlarged structure of area B is shown in FIG. Figure 2 , Figure 3 and Figure 4 As shown, the energy storage device 100 includes: a box body 10, a plurality of electrode assemblies 20 and a first end cover assembly 30, the box body 10 includes a plurality of accommodating cavities 11 distributed in an array and having a first opening; the plurality of electrode assemblies 20 correspond one-to-one to the plurality of accommodating cavities 11, and a fixing frame 21 is circumferentially arranged on the side wall of the electrode assembly 20, each electrode assembly 20 is accommodated in the corresponding accommodating cavity 11, and the fixing frame 21 separates the annular gap between the electrode assembly 20 and the corresponding accommodating cavity 11 into a plurality of chambers in the depth direction of the accommodating cavity 11; the first end cover assembly 30 includes a plurality of first end cover units 31 corresponding one-to-one to the plurality of accommodating cavities 11, and each first end cover unit 31 seals the first opening of the corresponding accommodating cavity 11.

[0063] In the embodiment of the present application, a fixing frame 21 is provided on the side wall of the electrode assembly 20, so that when the electrode assembly 20 is loaded into the corresponding accommodating cavity 11, the fixing frame 21 can be used to prevent the side wall of the electrode assembly 20 from being scratched against the opening edge of the accommodating cavity 11, thereby ensuring the yield of the energy storage device 100; in addition, after the electrode assembly 20 is loaded into the corresponding accommodating cavity 11, the fixing frame 21 can be used to reduce or even prevent the activity space of the electrode assembly 20 in the accommodating cavity 11, thereby preventing the energy storage device 100 from shaking when subjected to external force, thereby preventing the connection between the electrode assembly 20 and the first end cover unit 31 from becoming loose, thereby extending the service life of the energy storage device 100 and ensuring safety.

[0064] Among them, the box body 10 can be a square structure or a cylindrical structure, etc., and the accommodating cavity 11 included in the box body 10 can be a cylindrical cavity or a square cavity. The multiple accommodating cavities 11 included in the box body 10 can be distributed in a square array or a triangular array, etc. Taking the square array distribution as an example, the multiple accommodating cavities 11 can be arranged in one row and multiple columns, or in multiple rows and multiple columns. The first openings of the multiple accommodating cavities 11 are located on the same side of the box body 10. The accommodating cavities 11 on the box body 10 can be formed by the stamping direction to ensure that there is no communication between any two accommodating cavities 11; of course, the box body 10 can also be formed in other ways, which is not limited in the embodiments of the present application. In addition, if Figure 3 As shown, the outer side wall of the box body 10 may be protrudingly provided with a mounting ear plate 15, and the mounting ear plate 15 is provided with a mounting hole 16 to facilitate the installation and fixation of the energy storage device 100 when in use.

[0065] In addition, the accommodating cavity 11 provided on the box body 10 may be a blind hole structure or a through hole structure. When the accommodating cavity 11 is a blind hole structure, the accommodating cavity 11 has a first opening; when the accommodating cavity 11 is a through hole structure, that is, the accommodating cavity 11 penetrates the box body 10 in the depth direction, the accommodating cavity 11 has a first opening and a second opening. The first opening of the accommodating cavity 11 may be sealed by the first end cover unit 31, and the second opening of the accommodating cavity 11 may be sealed by the first end cover unit 31. Figure 2 As shown, the energy storage device 100 further includes a second end cover assembly 40 , which seals the second openings of the plurality of accommodating cavities 11 , thereby ensuring the sealing of the accommodating cavities 11 .

[0066] The structure of the second end cover assembly 40 may be the same as or different from that of the first end cover assembly 30; when the structure of the second end cover assembly 40 is the same as that of the first end cover assembly 30, the second end cover unit included in the second end cover assembly 40 may be used to seal the second opening of the accommodating cavity 11; when the structure of the second end cover assembly 40 is different from that of the first end cover assembly 30, such as Figure 5 and Figure 6As shown, the second end cover assembly 40 includes a packaging plate 41 and a plurality of second sealing rings 42. The plurality of second sealing rings 42 correspond one-to-one to the plurality of accommodating cavities 11. The second sealing rings 42 are located between the packaging plate 41 and the box body 10, and surround the second opening of the corresponding accommodating cavity 11. The packaging plate 41 is fixedly connected to the box body 10 (for example, bolted, bonded, welded, etc.).

[0067] Among them, the electrode assembly 20 can be a cylinder formed by winding the positive electrode sheets, the negative electrode sheets and the separators alternately, or a square body formed by stacking. The length of the electrode assembly 20 can be between 0.5 meters and 1.0 meters, such as 0.5 meters, 0.7 meters, 0.9 meters, and 1.0 meters, so as to improve the high energy level of the electrode assembly 20. Preferably, the length of the electrode assembly 20 is 0.8 meters. Of course, the length of the electrode assembly 20 can also be less than 0.5 meters, or greater than 1.0 meters, which is not limited in the embodiments of the present application. The end of the electrode assembly 20 has a positive electrode ear 22 connected to the positive electrode sheet, and a negative electrode ear 23 connected to the negative electrode sheet, such as Figure 4 As shown, the positive electrode ear 22 and the negative electrode ear 23 can be located at the same end of the electrode assembly 20 (such as a square electrode assembly 20). Of course, the positive electrode ear 22 and the negative electrode ear 23 can also be located at different ends of the electrode assembly 20 (such as a cylindrical electrode assembly 20). Take the positive electrode ear 22 and the negative electrode ear 23 as an example. Figure 4 As shown, the first end cap unit 31 includes a positive terminal 312 and a negative terminal 313 , and the positive terminal 312 is electrically connected to the positive electrode tab 22 , and the negative terminal 313 is electrically connected to the negative electrode tab 23 , so as to realize the electrical energy output of the electrode assembly 20 through the positive terminal 312 and the negative terminal 313 .

[0068] In addition, it should be noted that the first end cap unit 31 also includes a metal adapter, which can be used to connect the electrode terminal (positive terminal 312, negative terminal 313) with the corresponding pole lug (positive pole lug 22, negative pole lug 23) to ensure the stability of the connection between the electrode terminal and the corresponding pole lug, while ensuring the current flow capacity between the electrode terminal and the corresponding pole lug.

[0069] Among them, the fixing frame 21 can be fixed to the side wall of the electrode assembly 20 by bonding or the like, and the fixing frame 21 can be a cylindrical structure. The side wall of the electrode assembly 20 can be provided with a fixing frame 21, or a plurality of fixing frames 21 spaced apart and distributed along the depth direction of the accommodating cavity 11 can be provided. There can be a certain gap between the fixing frame 21 and the cavity wall of the accommodating cavity 11, so as to facilitate the connection between the chambers on both sides of the fixing frame 21, and then facilitate the circulation of the electrolyte, and the circulation of high-temperature gas when thermal runaway occurs in the electrode assembly 20. Of course, the fixing frame 21 can also abut against the cavity wall of the accommodating cavity 11, in which case the fixing frame 21 has a vent hole penetrating along the depth direction of the accommodating cavity 11, so as to facilitate the circulation of electrolyte, high-temperature gas, etc. in the chambers on both sides of the fixing frame 21. Furthermore, the fixing frame 21 has a through hole extending radially therethrough, and the through hole is connected to the vent hole provided on the fixing frame 21 , so as to facilitate the electrolyte to infiltrate the electrode assembly 20 along the through hole from the area where the fixing frame 21 is provided, so as to further improve the infiltration effect of the electrode assembly 20 .

[0070] In some embodiments, the cavity wall of the accommodating cavity 11 has a first guide mechanism extending in the depth direction, the fixing frame 21 has a second guide mechanism, the first guide mechanism cooperates with the corresponding second guide mechanism, and is used to limit the center line of the electrode assembly 20 to be parallel to the depth direction of the corresponding accommodating cavity 11. In this way, the first guide mechanism and the second guide mechanism can be set to ensure that the center line of the electrode assembly 20 is parallel to the depth direction of the accommodating cavity 11 when the electrode assembly 20 is loaded into the accommodating cavity 11, and avoid friction between the first opening edge of the accommodating cavity 11 and the side wall of the electrode assembly 20.

[0071] Among them, Figure 3 and Figure 6 As shown, the first guide mechanism is the guide groove 12, and the second guide mechanism is the strip-shaped protrusion 211; of course, the first guide mechanism may also be the strip-shaped protrusion 211, and the second guide mechanism may be the guide groove 12. In the case where the first guide mechanism is the guide groove 12, it is convenient to increase the cross-sectional area of ​​the chambers on both sides of the fixing frame 21, thereby facilitating the improvement of the circulation efficiency of the electrolyte and the high-temperature gas.

[0072] Among them, the cavity wall of the accommodating cavity 11 has a plurality of first guide mechanisms distributed at intervals along the circumferential direction, and correspondingly, the fixing frame 21 has a plurality of second guide mechanisms corresponding one to one with the plurality of first guide mechanisms. Taking the first guide mechanism as the guide groove 12 and the second guide mechanism as the strip-shaped protrusion 211 as an example, the cavity wall of the accommodating cavity 11 has four guide grooves 12 distributed at intervals, and the fixing frame 21 has four strip-shaped protrusions 211 corresponding one to one.

[0073] In the embodiment of the present application, for the first end cap unit 31 described above, the first end cap unit 31 includes, in addition to the electrode terminal described above, Figure 4As shown, the first end cap unit 31 further includes a cover plate 311 and an insulating member (not shown in the figure), the insulating member is located between the cover plate 311 and the first open end surface of the corresponding accommodating cavity 11, and the cover plate 311 is fixedly connected to the box body 10. In this way, the first open end of the accommodating cavity 11 can be sealed by squeezing the insulating member by the cover plate 311, thereby ensuring the packaging effect of the electrode assembly 20.

[0074] The specific structure of the cover plate 311 can refer to the relevant technology, for example, Figure 4 As shown, a liquid injection hole 314 and an explosion-proof valve 315 may be provided on the cover plate 311. The liquid injection hole 314 is used to inject electrolyte into the accommodating chamber 11, and the explosion-proof valve 315 is used to discharge the gas in the accommodating chamber 11 to improve the safety of the energy storage device 100. As for the electrode terminal mentioned above, it can be penetrated on the cover plate 311, so that the exposed part of the electrode terminal on one side of the cover plate 311 is electrically connected to the electrode tab on the electrode assembly 20, and the exposed part on the other side of the cover plate 311 is used as the output end.

[0075] The insulating member may be a plastic member to ensure the sealing of the first opening of the accommodating cavity 11 and to achieve insulation between the electrode assembly 20 and the cover plate 311. The structure of the plastic member may refer to the relevant art, and this application will not elaborate on it.

[0076] The cover plate 311 can be fixed to the box body 10 by bonding, welding, or screwing. Of course, in addition to the cover plate 311 being directly fixed to the box body 10, other methods can also be used. Figure 4 and Figure 7 As shown, the first end cover assembly 30 also includes a pressure plate 32, which has a plurality of sink grooves 321, and the bottom of the sink grooves 321 has a hollow area 322; the plurality of sink grooves 321 correspond one-to-one to the plurality of cover plates 311, the pressure plate 32 is crimped on the plurality of cover plates 311, and is fixedly connected to the box body 10, each cover plate 311 is limited in the corresponding sink groove 321, and a partial area of ​​each cover plate 311 is exposed at the corresponding hollow area 322.

[0077] In this way, the multiple cover plates 311 can be fixed synchronously by the pressing plate 32 to simplify the assembly efficiency of the energy storage device 100. At the same time, when the cover plate 311 is limited in the corresponding sinking groove 321, the cover plate 311 can be limited to avoid displacement of the cover plate 311, thereby ensuring the sealing effect of the cover plate 311 on the accommodating cavity 11. At the same time, the electrode terminal, the injection hole 314, and the explosion-proof valve 315 on the cover plate 311 are exposed through the hollow area 322 at the bottom of the sinking groove 321 to ensure that after the pressing plate 32 is fixedly connected to the box body 10, the injection, exhaust, and electrical connection with the external circuit of the energy storage device 100 are not affected.

[0078] Optionally, the pressing plate 32 can be fixed to the box body 10 by tightening screws, in which case the cover plate 311 can be detachable, which is convenient for subsequent maintenance and repair, as well as the disassembly and recycling of some components. In addition, when fixing by bolts, a circle of fixing bolts can be set along the pressing plate 32, so that the consistency of fixing of the pressing plate 32 to multiple cover plates 311 can be ensured, and the problem of individual cover plates 311 being loose can be avoided.

[0079] Further, if Figure 3 and Figure 4 As shown, a third sealing ring 34 may be further provided between the cover plate 311 and the first opening end face of the accommodating chamber 11. The third sealing ring 34 surrounds the first opening of the corresponding accommodating chamber 11, so that when the pressing plate 32 is pressed onto the cover plate 311, the cover plate 311 squeezes the third sealing ring 34, thereby further improving the sealing effect of the cover plate 311 on the first opening of the accommodating chamber 11. In combination with the above-mentioned situation that the pressing plate 32 is fixed to the box body 10 by fixing bolts, the uniformity of the deformation of the third sealing ring 34 can be effectively ensured by providing a circle of fixing bolts.

[0080] The first opening end face of the accommodating cavity 11 is provided with a sealing groove surrounding the accommodating cavity 11 , and the third sealing ring 34 is limited in the sealing groove to avoid displacement and deformation when the third sealing ring 34 is squeezed, thereby ensuring the sealing effect of the third sealing ring 34 .

[0081] In the embodiment of the present application, when the energy storage device 100 is charged and discharged, the electrode assembly 20 will inevitably generate heat, thereby increasing the ambient temperature of the energy storage device 100. In this way, a cooling system can be provided to cool the ambient temperature and ensure the stability of the charging and discharging of the energy storage device 100.

[0082] In some embodiments, Figure 3 As shown, the box body 10 also has a plurality of cooling cavities 13 that are alternately distributed with the accommodating cavities 11 in the arrangement direction of the plurality of accommodating cavities 11 , the first opening of the cooling cavities 13 and the first opening of the accommodating cavities 11 are located on the same side of the box body 10 , and the pressure plate 32 seals the first openings of the plurality of cooling cavities 13 .

[0083] In this way, after the electrode assembly 20 is assembled in the accommodating chamber 11, the coolant can be injected along the first opening of the cooling chamber 13, and then the accommodating chamber 11 and the cooling chamber 13 can be sealed synchronously through the pressing plate 32, thereby facilitating the assembly of the energy storage device 100. In combination with the above, the pressing plate 32 is provided with a sink groove 321, so that when the pressing plate 32 is buckled on the cover plate 311, it can ensure that the pressing plate 32 is directly attached to the first opening end surface of the cooling chamber 13, thereby sealing the cooling chamber 13.

[0084] The cooling cavity 13 provided on the box body 10 may be a blind hole structure or a through hole structure. When the cooling cavity 13 is a blind hole structure, the cooling cavity 13 has a first opening; when the cooling cavity 13 is a through hole structure, that is, the cooling cavity 13 penetrates the box body 10 in the depth direction, the cooling cavity 13 has a first opening and a second opening. The first opening of the cooling cavity 13 can be sealed by the pressing plate 32, and for the second opening of the cooling cavity 13, in combination with the above, as Figure 6 As shown, the energy storage device 100 further includes a second end cover assembly 40 , which seals the second openings of the plurality of cooling cavities 13 , thereby ensuring the sealing of the plurality of cooling cavities 13 .

[0085] In combination with the above, when the structure of the second end cover assembly 40 is the same as that of the first end cover assembly 30, the sealing of the plurality of cooling cavities 13 can be achieved by the pressure plate 32 included in the second end cover assembly 40; when the structure of the second end cover assembly 40 is different from that of the first end cover assembly 30, such as Figure 6 As shown, the second end cover plate 311 assembly includes a packaging plate 41 and a fourth sealing ring 43. The fourth sealing ring 43 is located between the packaging plate 41 and the box body 10, and surrounds the second openings of multiple cooling cavities 13. The packaging plate 41 is fixedly connected to the box body 10 (for example, bolted, bonded, welded, etc.).

[0086] Furthermore, if Figure 6 As shown, the housing 10 has a sink 14 located at the second opening end surface of the cooling cavity 13, and the sink 14 is connected to the multiple cooling cavities 13. In this way, the second openings of the multiple cooling cavities 13 are sealed by the second end cover assembly 40, and coolant is injected into the multiple cooling cavities 13 along the first opening of any cooling cavity 13 at the same time, which can simplify the injection operation and improve the injection efficiency.

[0087] Optionally, the housing 10 further includes a cooling cavity 13 located on at least one side of the accommodating cavity 11 in a direction perpendicular to the arrangement direction of the accommodating cavity 11 , thereby increasing the total volume of the cooling cavity 13 on the housing 10 to further improve the cooling effect on the energy storage device 100 .

[0088] Among them, for the cooling cavity 13 on one side of the accommodating cavity 11, multiple cooling cavities 13 can be independent cavities, or of course, they can be connected integrated cavities, which is not limited in the implementation of the present application. Compared with the structure of the integrated cavity, the independent cavity can effectively ensure the structural strength of the box body 10; and compared with the structure of the independent cavity, the integrated cavity can effectively increase the total volume of the cooling cavity 13.

[0089] Alternatively, if Figure 3As shown, the first end cover assembly 30 further includes a first sealing ring 33, which is located between the first opening end surface of the cooling cavity 13 and the pressing plate 32, and the first openings of the plurality of cooling cavities 13 and the first openings of the plurality of accommodating cavities 11 are all located within the area surrounded by the first sealing ring 33. In this way, by providing the first sealing ring 33, the sealing effect of the pressing plate 32 on the plurality of cooling cavities 13 can be effectively improved.

[0090] The present application also provides an electric device 400, which may be a user energy storage cabinet, an energy storage container, etc. Figure 8 As shown, the electric device 400 includes the energy storage device 100 described in the above embodiment, and the energy storage device 100 supplies power to the electric device 400. Thus, in combination with the above, the electric device 400 of the present application can improve the working stability of the electric device 400 based on the high energy density of the energy storage device 100 during use, and at the same time improve the working safety of the electric device 400 based on the stability of the electrode assembly 20.

[0091] In the embodiments of the present application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0092] In the description of the implementation methods of the present application, it needs to be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the implementation methods of the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the implementation methods of the present application.

[0093] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the implementation of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0094] The above are only preferred embodiments of the implementation methods of the present application, and are not intended to limit the implementation methods of the present application. For those skilled in the art, the implementation methods of the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the implementation methods of the present application shall be included in the protection scope of the implementation methods of the present application.

Claims

1. An energy storage device (100), characterized in that: include: A box body (10) comprises a plurality of accommodating chambers (11) distributed in an array and having a first opening; A plurality of electrode assemblies (20) corresponding one to the plurality of accommodating cavities (11); a fixing frame (21) is provided on the side wall of the electrode assembly (20) along the circumferential direction; each electrode assembly (20) is accommodated in the corresponding accommodating cavity (11); and the fixing frame (21) separates the annular gap between the electrode assembly (20) and the corresponding accommodating cavity (11) into a plurality of chambers in the depth direction of the accommodating cavity (11); The first end cover assembly (30) comprises a plurality of first end cover units (31) corresponding one-to-one to the plurality of accommodating cavities (11), and each of the first end cover units (31) seals a first opening of a corresponding accommodating cavity (11).

2. The energy storage device (100) according to claim 1, characterized in that: The cavity wall of the accommodating cavity (11) has a first guide mechanism extending along the depth direction, and the fixing frame (21) has a second guide mechanism, the first guide mechanism cooperates with the corresponding second guide mechanism and is used to limit the center line of the electrode assembly (20) to be parallel to the depth direction of the corresponding accommodating cavity (11).

3. The energy storage device (100) according to claim 2, characterized in that: The first guiding mechanism is a guiding groove (12), and the second guiding mechanism is a strip-shaped protrusion (211).

4. The energy storage device (100) according to claim 1, characterized in that: The side wall of the electrode assembly (20) is provided with a plurality of fixing frames (21) distributed at intervals along the depth direction.

5. The energy storage device (100) according to claim 1, characterized in that: The accommodating cavity (11) penetrates the box body (10) in the depth direction; The energy storage device (100) further comprises a second end cover assembly (40), wherein the second end cover assembly (40) seals the second openings of the plurality of accommodating cavities (11).

6. The energy storage device (100) according to any one of claims 1 to 5, characterized in that: The first end cover unit (31) comprises a cover plate (311) and an insulating member, wherein the insulating member is located between the cover plate (311) and a first opening end surface of the corresponding accommodating cavity (11), and the cover plate (311) is fixedly connected to the box body (10).

7. The energy storage device (100) according to claim 6, characterized in that: The first end cover assembly (30) further comprises a pressing plate (32), wherein the pressing plate (32) has a plurality of sink grooves (321), and the bottom of the sink grooves (321) has a hollow area (322); The plurality of sink grooves (321) correspond one-to-one to the plurality of cover plates (311); the pressing plate (32) is crimped onto the plurality of cover plates (311) and fixedly connected to the box body (10); each of the cover plates (311) is limited in a corresponding sink groove (321), and a partial area of ​​each of the cover plates (311) is exposed at a corresponding hollow area (322).

8. The energy storage device (100) according to claim 7, characterized in that: The box body (10) further comprises a plurality of cooling chambers (13) which are distributed alternately with the accommodating chambers (11) in the arrangement direction of the plurality of accommodating chambers (11); The first opening of the cooling cavity (13) and the first opening of the accommodating cavity (11) are located on the same side of the box body (10), and the pressing plate (32) seals the first openings of the plurality of cooling cavities (13).

9. The energy storage device (100) according to claim 8, characterized in that: The first end cover assembly (30) further comprises a first sealing ring (33), wherein the first sealing ring (33) is located between a first opening end surface of the cooling cavity (13) and the pressure plate (32), and a plurality of first openings of the cooling cavity (13) and a plurality of first openings of the accommodating cavity (11) are all located within an area enclosed by the first sealing ring (33).

10. The energy storage device (100) according to claim 8, characterized in that: The cooling cavity (13) penetrates the box body (10) in the depth direction, and the box body (10) has a sink (14) located on the second opening end surface of the cooling cavity (13); The energy storage device (100) further comprises a second end cover assembly (40), the sink (14) being connected to the second openings of the plurality of cooling chambers (13), and the second end cover assembly (40) sealing the sink (14) and the second openings of the plurality of cooling chambers (13).

11. An electrical device, characterized in that: The electrical equipment comprises the energy storage device (100) described in any one of claims 1 to 10 above, and the energy storage device (100) supplies power to the electrical equipment.

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