CN120432837B - Energy storage device and electric equipment - Google Patents
Energy storage device and electric equipmentInfo
- Publication number
- CN120432837B CN120432837B CN202510902984.0A CN202510902984A CN120432837B CN 120432837 B CN120432837 B CN 120432837B CN 202510902984 A CN202510902984 A CN 202510902984A CN 120432837 B CN120432837 B CN 120432837B
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- energy storage
- fuse
- battery module
- storage device
- locking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Connection Of Batteries Or Terminals (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
本申请涉及储能技术领域，公开一种储能装置及用电设备，储能装置包括箱体、电池模组、安装支架、熔断器和导热层。箱体包括上盖、底座和检修盖，上盖和底座连接，且围成一容纳腔，上盖和底座其中一个具有端面板，端面板具有贯穿的检修口，检修口与容纳腔连通，检修盖被配置为封盖检修口；电池模组位于容纳腔内；安装支架位于容纳腔内，且与底座固接；熔断器位于容纳腔内，且组装在安装支架上，并与电池模组电连接，熔断器的至少部分在检修口处裸露；导热层夹持在熔断器和检修盖之间。
The present application relates to the field of energy storage technology and discloses an energy storage device and electrical equipment. The energy storage device includes a housing, a battery module, a mounting bracket, a fuse, and a thermally conductive layer. The housing includes an upper cover, a base, and an inspection cover. The upper cover and the base are connected and enclose a receiving cavity. One of the upper cover and the base has an end panel, and the end panel has a through inspection port. The inspection port is connected to the receiving cavity, and the inspection cover is configured to cover the inspection port. The battery module is located in the receiving cavity. The mounting bracket is located in the receiving cavity and is fixed to the base. The fuse is located in the receiving cavity and is assembled on the mounting bracket and is electrically connected to the battery module. At least a portion of the fuse is exposed at the inspection port. The thermally conductive layer is clamped between the fuse and the inspection cover.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an energy storage device and electric equipment.
Background
In recent years, with the rapid development of new energy power generation, smart grids and electric vehicles, energy storage devices are widely applied to large-scale energy storage systems due to the advantages of high energy density, long cycle life and the like. However, as the energy storage device is developed to a high capacity and high power, the heat dissipation problem of the energy storage device is increasingly prominent, and the safety, reliability and service life of the system are seriously affected.
Disclosure of Invention
The embodiment of the application provides an energy storage device and electric equipment, which can improve the heat dissipation efficiency of the energy storage device.
An energy storage device according to an embodiment of the present application includes:
the box body comprises an upper cover, a base and an access cover, wherein the upper cover is connected with the base and encloses a containing cavity, one of the upper cover and the base is provided with an end panel, the end panel is provided with an access hole penetrating through the upper cover, the access hole is communicated with the containing cavity, and the access cover is configured to cover the access hole;
The battery module is positioned in the accommodating cavity;
The mounting bracket is positioned in the accommodating cavity and fixedly connected with the base;
A fuse located in the receiving cavity, assembled on the mounting bracket and electrically connected with the battery module, at least part of the fuse being exposed at the access opening, and
And the heat conduction layer is clamped between the fuse and the access cover.
In the embodiment of the application, the heat conducting layer is arranged between the fuse and the access cover, heat in the box body and heat generated by the fuse can be quickly conducted to the access cover through the heat conducting layer, and the access cover can effectively dissipate heat of the fuse based on the heat conducting layer, so that the fuse is prevented from being in a high-temperature running state for a long time, the problems of misuse, performance reduction and the like of the fuse are further avoided, the service life of the fuse is prolonged, and the working reliability of the energy storage device is ensured. In addition, can the closing cap or open the access hole based on the access cover, be convenient for overhaul the fuse to the maintenance efficiency of fuse has been improved.
According to some embodiments of the application, the access cover is detachably connected to the end panel.
In the embodiment of the application, the access cover is detachably connected to the end panel outside the box body, so that an operator can conveniently disassemble and assemble the access cover outside the box body, and the disassembly and assembly efficiency of the access cover is improved.
According to some embodiments of the application, a side of the access cover facing the battery module is provided with a containing space, and a part of the fuse protrudes out of the outer surface of the end panel through the access opening and is contained in the containing space.
In the embodiment of the application, on one hand, part of the fuse extends out of the outer surface of the end panel to be more beneficial to heat dissipation of the fuse, on the other hand, the end panel of the battery pack of the related art is usually provided with components such as a high-voltage plug connector, an explosion-proof valve, a liquid cooling joint and the like, and the components occupy the space in the length direction of the battery pack.
According to some embodiments of the application, a side surface of the access cover facing away from the battery module is provided with a protrusion, and the receiving space is recessed inward of the protrusion in a thickness direction of the access cover from a surface of the access cover facing the battery module.
In the embodiment of the application, the access cover can be machined by adopting a thinner plate through a stamping process, so that one side of the access cover is provided with the bulge, and the other side of the access cover is provided with the accommodating space, and the thickness of the access cover is not required to be designed thicker for designing the accommodating space on one side of the access cover, thereby saving the material cost.
According to some embodiments of the application, the mounting bracket includes a mounting portion having a receiving slot with a slot opening facing away from the receiving cavity, and the fuse is disposed in the receiving slot.
In the embodiment of the application, the accommodating groove can protect the fuse, and the fuse is prevented from being knocked when other parts are assembled.
According to some embodiments of the application, a side of the access cover facing the battery module is provided with a containing space, a part of the mounting part extends out of the outer surface of the end panel through the access hole and is contained in the containing space, and a notch of the containing groove is formed by a part of the mounting part extending out of the outer surface of the end panel.
In the embodiment of the application, as the part of the mounting part is positioned on the outer surface of the end panel and is accommodated in the accommodating space, the space utilization rate of the battery pack is improved, and the energy storage density of the energy storage device is further improved.
According to some embodiments of the application, the energy storage device further comprises a first locking piece that locks the fuse within the receiving slot.
In the embodiment of the application, the fuse and the mounting bracket are locked through the first locking piece, so that the connection firmness of the fuse and the mounting bracket is ensured, the fuse is convenient to detach from the mounting bracket, and the maintenance efficiency of the fuse is improved.
According to some embodiments of the application, a locking structure is convexly arranged at the bottom of the groove of the accommodating groove, the locking structure comprises a wrapping part and a second locking piece inlaid in the wrapping part, and the first locking piece is in threaded connection with the second locking piece so as to lock the fuse with the mounting part.
According to some implementations of the embodiments of the application, the first and second locking pieces are made of a metallic material, and the mounting bracket and the wrap are made of an insulating material.
In the embodiment of the application, the second locking piece is embedded in the wrapping part, so that the first locking piece and the second locking piece can be made of metal materials, the locking strength is ensured to ensure the locking stability of the fuse and the mounting part, and the mounting bracket and the wrapping part can be made of insulating materials, thereby improving the electrical insulation of the mounting bracket.
According to some embodiments of the application, the bottom surface of the accommodating groove is convexly provided with two locking structures, and the energy storage device comprises two first locking pieces;
The fuse comprises a fusing body and two wiring terminals, wherein the fusing body and the two wiring terminals are positioned between the two locking structures, the heat conduction layer is clamped between the fusing body and the access cover, and the two wiring terminals are respectively arranged on two opposite end surfaces of the fusing body;
the energy storage device further comprises two conductive pieces, the two conductive pieces are respectively and electrically connected with the two wiring terminals, one of the conductive pieces is electrically connected with the battery module, and the two first locking pieces are respectively and threadedly connected with the two locking structures so as to lock the two groups of corresponding conductive pieces and the wiring terminals.
In the embodiment of the application, the two first locking pieces lock the fuse on the mounting bracket and simultaneously connect the fuse into a loop of the battery module through the two conductive pieces, namely, the first locking pieces have the function of mechanical connection and the function of electric connection, and one part has two functions at the same time, so that the cost is saved and the disassembly and assembly efficiency of the fuse is improved.
According to some embodiments of the application, the base comprises a bottom plate, the battery module is assembled on the bottom plate, the groove side wall of the accommodating groove is provided with a bottom side wall positioned between the bottom plate and the fuse, the bottom side wall is concavely formed into two avoidance grooves towards the direction of the battery module, and the two conductive pieces are respectively arranged in the two avoidance grooves in a penetrating manner.
In the embodiment of the application, the bottom side wall is concaved inwards towards the direction of the battery module to form the avoidance groove, and the conductive piece can penetrate through the avoidance groove from one side of the bottom side wall, which is opposite to the fuse, and extend into the accommodating groove, so that the length of the conductive piece can be reduced, and the material cost is reduced.
According to some embodiments of the application, the conductive element has a bent portion located on a side of the bottom sidewall facing away from the fuse.
In the embodiment of the application, the bending part of the conductive piece is positioned at one side of the bottom side wall, which is opposite to the fuse, and the bending part is gradually far away from the bottom side wall under the action of self gravity, so that the conductive piece is not in extrusion contact with the groove wall of the accommodating groove, further the damage to the insulating film outside the conductive piece due to continuous friction between the conductive piece and the groove wall of the accommodating groove is avoided, and the risk of short circuit of the conductive piece is reduced.
According to some embodiments of the application, a reinforcing structure is further provided around each of the locking structures, the reinforcing structure being connected between the locking structure and the groove wall of the receiving groove.
In the embodiment of the application, the reinforcing structure is connected around the locking structure, so that the structural strength of the locking structure is improved, the torsional strength of the locking structure when the first locking piece and the locking structure are locked is further improved, and the stability of the fuse assembled in the accommodating groove is improved.
According to some embodiments of the application, the reinforcement structure includes a first rib and a second rib connected between the locking structure and a wall of the receiving groove, the first rib extending in a height direction of the battery module, the second rib extending in a width direction of the battery module, the first rib having a first limit portion, the second rib having a second limit portion;
The two first limiting parts are respectively positioned on the same side of the two connecting terminals, and the two second limiting parts are respectively positioned on two sides of the two connecting terminals, which are opposite to each other along the width direction of the battery module.
In the embodiment of the application, the two connecting terminals of the fuse can be limited in the height direction of the battery module by the two first limiting parts, and the two connecting terminals of the fuse can be limited in the width direction of the battery module by the two second limiting parts, so that the two connecting terminals of the fuse are aligned with the two locking structures quickly, and the assembly efficiency of the fuse is improved.
According to some embodiments of the application, the base includes a bottom plate, and the slot side wall of the receiving slot has a bottom side wall between the bottom plate and the fuse.
In the embodiment of the application, the bottom side wall is positioned between the bottom plate and the fuse, so that the bottom side wall can support and position the fuse when the fuse and the mounting bracket are assembled, and the fuse is conveniently locked on the mounting bracket by the first locking piece.
According to some embodiments of the application, the fuse comprises a fuse body, the heat conducting layer is clamped between the fuse body and the access cover, the bottom side wall is provided with a first protruding part, the first protruding part protrudes out of one side surface of the fuse body, which faces away from the battery module, the groove side wall of the accommodating groove is also provided with a top side wall which is opposite to the bottom side wall along the height direction of the battery module, the top side wall is provided with a second protruding part, the second protruding part protrudes out of one side surface of the fuse body, which faces away from the battery module, and at least part of the heat conducting layer is limited between the first protruding part and the second protruding part.
In the embodiment of the application, the first extending part and the second extending part extend out of the surface of the fusing body, which is opposite to the battery module, and when the heat conducting layer is required to be pre-adhered to the fusing body, the space between the first extending part and the second extending part can be used for installing and positioning the heat conducting layer, so that the heat conducting layer is prevented from moving relative to the fusing body in the arrangement direction of the first extending part and the second extending part.
According to some embodiments of the application, the mounting bracket is made of an insulating material.
The electric equipment comprises any energy storage device, wherein the energy storage device is used for supplying power to the electric equipment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic diagram of an energy storage system.
Fig. 2 is an exploded view of an energy storage device according to an embodiment of the present application.
Figure 3 is an exploded schematic view of a fuse, mounting bracket, access cover, end panel of an embodiment of the present application.
Fig. 4 is a schematic view of an assembled fuse, mounting bracket, and conductive member according to an embodiment of the present application.
Fig. 5 is an exploded view of a fuse, mounting bracket, electrical conductor, thermally conductive layer according to an embodiment of the present application.
Fig. 6 is a schematic view of a fuse and mounting bracket of an embodiment of the present application in one view after assembly.
Fig. 7 is a schematic view of an assembled fuse and mounting bracket according to an embodiment of the present application at another view angle.
Fig. 8 is a schematic view of a fuse of an embodiment of the present application in yet another perspective after assembly with a mounting bracket.
Fig. 9 is a schematic view of a locking structure and a reinforcing structure of an embodiment of the present application, wherein the locking structure and the reinforcing structure are provided with a receiving groove of a mounting bracket.
Fig. 10 is a schematic diagram of a powered device.
Wherein reference numerals are as follows:
100. The box body, 101, a containing cavity, 110, an upper cover, 120, a base, 121, an end panel, 1211, an access hole, 122, a bottom plate, 130, an access cover, 131, a containing space, 132 and a bulge;
200. 220, single batteries;
300. a harness sampling assembly;
500. a first locking piece;
600. Mounting bracket 610, connecting part 620, mounting part 621, accommodation groove 622, locking structure 6221, wrapping part 6222, second locking part 623, avoiding groove 624, bottom side wall 6241, first extension part 625, top side wall 6251, second extension part 626, end side wall 630, reinforcing structure 631, first rib 6311, first limit part 632, second rib 6321, second limit part 6321;
700. Fuse, 710, fusing body, 720, wiring terminal, 721, first perforation;
800. A heat conducting layer;
910. Conductive piece 911, second perforation 912, bending part.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
It will be understood that the terms "comprising," "including," and "having," and any variations thereof, are intended to cover non-exclusive inclusions in the embodiments of the application. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application.
At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.
Taking electrochemical energy storage as an example, the scheme provides an energy storage device which is applied to an energy storage system, wherein a group of chemical batteries are arranged in the energy storage device, chemical elements in the batteries are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.
The present energy storage (i.e. energy storage) application scenario is comparatively extensive, including aspects such as power generation side energy storage, electric wire netting side energy storage and power consumption side energy storage, and the kind of corresponding energy storage device includes:
(1) The energy storage power station is used as a high-quality active/reactive power regulating power supply in a power supply side, so that the load matching of electric energy in time and space is realized, the capacity of absorbing renewable energy sources is enhanced, the instantaneous power change is reduced, the impact on a power grid is reduced, the problem of new energy power generation and absorption is improved, and the energy storage power station has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;
(2) The energy storage container applied to the power grid side has the functions of mainly peak regulation, frequency modulation and power grid blocking and peak regulation relieving, and can realize peak clipping and valley filling of the power consumption load, namely the energy storage battery is charged when the power consumption load is low, and the stored electric quantity is released in the peak period of the power consumption load, so that the balance between power production and power consumption is realized;
(3) The small energy storage cabinet applied to the electricity utilization side has the main functions of spontaneous electricity utilization, peak Gu Jiacha arbitrage, capacity cost management and power supply reliability improvement. According to the different application scenes, the electricity-side energy storage can be divided into an industrial and commercial energy storage cabinet, a household energy storage device, an energy storage charging pile and the like, and is generally matched with the distributed photovoltaic. The energy storage can be used by industrial and commercial users for valley peak price difference arbitrage and capacity cost management. In the electric power market implementing peak-valley electricity price, the energy storage system is charged when the electricity price is low, and the energy storage system is discharged when the electricity price is high, so that peak-valley electricity price difference arbitrage is realized, and the electricity cost is reduced. In addition, the energy storage system is suitable for two industrial enterprises with electricity price, can store energy when electricity is used in low valley and discharge the energy when the electricity is used in peak load, so that peak power and the declared maximum demand are reduced, and the purpose of reducing the capacity electricity fee is achieved. The household photovoltaic distribution and storage can improve the spontaneous self-use level of the electric power. Due to high electricity prices and poor power supply stability, the photovoltaic installation requirements of users are pulled. Considering that the photovoltaic power generation is performed in daytime, and the load of a user is generally higher at night, the photovoltaic power can be better utilized through configuration of energy storage, the spontaneous self-use level is improved, and meanwhile the power consumption cost is reduced. In addition, the fields of communication base stations, data centers and the like need to be configured with energy storage for standby power.
In some embodiments, please refer to fig. 1, fig. 1 is a schematic diagram of an energy storage system according to an embodiment of the present application, and fig. 1 illustrates an example of a power generation/distribution side shared energy storage scenario, and the energy storage device of the present application is not limited to the power generation/distribution side energy storage scenario.
The application provides an energy storage system which comprises a high-voltage cable 2, a first electric energy conversion device 3, a second electric energy conversion device 4 and the energy storage device 1 provided by the application, wherein in some embodiments of a power generation side scene, the second electric energy conversion device 4 can be a wind power electric energy conversion device, because fluctuation, randomness and intermittence exist in electric energy generated by wind power electric energy conversion, unstable electric energy output by the wind power electric energy conversion device can be firstly stored in the energy storage device 1 through grid connection, the energy storage device 1 is connected with the high-voltage cable 2 and outputs smooth electric energy for being used at a power distribution network power utilization side, peak regulation and frequency modulation are realized, and a power grid stably operates; the wind power energy conversion device is always connected with the high-voltage cable 2, the electric energy output by the wind power energy conversion device is supplied to the power utilization side of the distribution network through the high-voltage cable under the condition of ordinary power generation, when the current power utilization load is low and the wind power energy conversion device generates excessive power, multiple generated electric energy is stored in the energy storage device 1, the wind discarding and light discarding rate is reduced, the problem of new energy power generation and absorption is solved, and when the power utilization load is high, the power grid gives an instruction, the electric energy stored in the energy storage device 1 is cooperated with the high-voltage cable 2 to jointly transmit the electric energy to the power utilization side for use in a grid-connected mode, multiple services such as peak regulation, frequency modulation and standby are provided for the power grid operation, the peak regulation effect of the power grid is fully exerted, peak clipping and valley filling of the power grid are promoted, and the power supply pressure of the power grid is relieved.
In some embodiments on the distribution network side, the first electric energy conversion device 3 may be a photovoltaic electric energy conversion device, where the energy storage device 1 is connected to the high-voltage cable 2 and installed between the downstream of the high-voltage cable 2 and the user load, and electric energy output by the photovoltaic electric energy conversion device is stored in the energy storage device 1, and is timely responded to serve as a standby power source when the power grid/distribution network fails, or provides power supply support to delay the economic pressure generated by the power grid/distribution expansion when the power transmission line of the high-voltage cable 2 is blocked to relieve the line blockage and the power grid planning expansion occurs.
Alternatively, the first electric energy conversion device 3 may include, but is not limited to, a wind power electric energy conversion device, the second electric energy conversion device 4 may include, but is not limited to, a photovoltaic electric energy conversion device, and the first electric energy conversion device 3 and the second electric energy conversion device 4 may convert at least one of solar energy, optical energy, wind energy, thermal energy, tidal energy, biomass energy, mechanical energy, and the like into electric energy.
Optionally, the energy storage device 1 may include, but is not limited to, energy storage application scenarios for energy storage power stations, hydraulic/thermal/wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and also be applied to a plurality of fields such as data centers, military equipment, aerospace, charging piles, electric vehicles, and the like.
Alternatively, the energy storage device 1 may include, but is not limited to, a battery pack, a battery cluster, a mobile power source, an energy storage cabinet/container, and the like. The practical application form of the energy storage device 1 provided in the embodiment of the present application may be, but 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 1.
As shown in fig. 2, the battery pack includes a case 100, a battery module 200, and a harness sampling assembly 300. The case 100 includes an upper cover 110 and a base 120, and the upper cover 110 and the base 120 are connected to form a receiving chamber 101, and the battery module 200 and the harness sampling assembly 300 are disposed in the receiving chamber 101. The battery module 200 is fixedly connected with the base 120, and the harness sampling assembly 300 is located at one side of the battery module 200 and is used for collecting the voltage and/or the temperature of the single battery of the battery module 200.
In one embodiment, the harness sampling assembly 300 is a CCS (Cell Connection System, integrated busbar).
It is understood that the number of the battery modules 200 may be one or more, and the number of the harness sampling assemblies 300 may be one or more. The number of battery modules 200 may be the same as or different from the number of harness sampling assemblies 300.
For example, as shown in fig. 2, the number of the battery modules 200 and the number of the harness sampling assemblies 300 are four, the four battery modules 200 are arranged in an array, and the four harness sampling assemblies 300 are located at one side of the four battery modules 200, respectively.
Of course, in other embodiments, the number of the harness sampling assemblies 300 may also be less than the number of the battery modules 200. For example, the number of the wire harness sampling assemblies 300 is two, the number of the battery modules 200 is four, and one wire harness sampling assembly 300 corresponds to two battery modules 200.
Each of the battery modules 200 includes a plurality of unit cells 220, and the plurality of unit cells 220 are arranged side by side. The plurality of unit cells 220 may be connected in series or parallel or in series-parallel connection, which refers to a combination of series and parallel connection. Wherein the harness sampling assembly 300 is capable of collecting the voltage and/or temperature of the battery cells 220.
When the number of the battery modules 200 is plural, the plurality of battery modules 200 may be connected in series, in parallel, or in series-parallel.
Alternatively, the unit cell 220 may be, but is not limited to, at least one of a cylindrical cell, a prismatic cell, or other shaped cell.
Alternatively, the unit cell 220 may be a secondary battery, and the secondary battery refers to the unit cell 220 that can be continuously used by activating the active material in a charging manner after the unit cell 220 is discharged.
The unit cell 220 may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like.
With continued reference to fig. 2, one of the upper cover 110 and the base 120 has an end plate 121, and the end plate 121 may be disposed at one end of the battery module 200 in the length direction.
In the embodiment of the application, the base 120 includes a bottom plate 122 and two end plates 121, the battery module 200 is disposed on the bottom plate 122, and the two end plates 121 are respectively connected to two ends of the bottom plate 122 along the length direction of the battery module 200. Of course, in other embodiments, the end panel 121 may also be disposed on the upper cover 110.
In order to improve the safety of the battery pack, the battery pack in the related art is generally provided with a fuse. When the internal or external circuit of the battery pack is short-circuited, the current passing through the fuse can be instantaneously increased, and the fuse can be instantaneously fused at the moment, so that a fault loop is cut off, and the catastrophic effect is avoided.
The inventor of the application discovers that when the battery pack works normally, heat accumulation is easy to occur in the space in the battery pack, and the fuse is in a state of high-temperature operation for a long time, so that the fuse is easy to have the defects of false fusing, performance reduction, service life shortening and the like, and further the working reliability of the energy storage device is reduced.
Based on this, the embodiment of the application remarkably improves the working reliability of the energy storage device by improving the heat dissipation efficiency of the fuse 700. As shown in fig. 3, the housing 100 further includes an access cover 130, the end panel 121 having an access opening 1211 therethrough, the access opening 1211 being in communication with the receiving chamber 101, the access cover 130 being configured to cover the access opening 1211.
The energy storage device 1 further comprises a fuse 700, a mounting bracket 600 and a heat conducting layer 800, wherein the mounting bracket 600 is positioned in the accommodating cavity 101 and fixedly connected with the base 120, the fuse 700 is positioned in the accommodating cavity 101, assembled on the mounting bracket 600 and electrically connected with the battery module 200, and at least part of the fuse 700 is exposed at the access hole 1211. The thermally conductive layer 800 is sandwiched between the fuse 700 and the access cover 130.
In the embodiment of the application, the heat conducting layer 800 is arranged between the fuse 700 and the access cover 130, and the heat in the box body 100 and the heat generated by the fuse 700 can be quickly conducted to the access cover 130 through the heat conducting layer 800, and the access cover 130 can effectively dissipate heat of the fuse 700 based on the heat conducting layer 800, so that the fuse 700 is prevented from being in a high-temperature running state for a long time, the problems of mistaken fusing, performance reduction and the like of the fuse 700 are avoided, the service life of the fuse 700 is prolonged, and the working reliability of the energy storage device is ensured. In addition, the access cover 130 can cover or open the access opening 1211, so that the fuse 700 is easily repaired, thereby improving the repair efficiency of the fuse 700.
In one embodiment, one side surface of the heat conductive layer 800 in the thickness direction is adhered to one of the fuse 700 and the access cover 130, and the other side surface of the heat conductive layer 800 in the thickness direction is adhered to the other of the fuse 700 and the access cover 130.
For example, the heat conductive layer 800 may be adhered to the surface of the fuse 700 facing away from the battery module 200 in advance by an adhesive or the like, and then the heat conductive layer 800 may be clamped between the fuse 700 and the access cover 130 based on the connection and fixation of the access cover 130 and the end plate 121.
Alternatively, the heat conductive layer 800 may be adhered to the inner surface of the access cover 130 in advance by an adhesive or the like, and then the heat conductive layer 800 may be clamped between the fuse 700 and the access cover 130 based on the connection and fixation of the access cover 130 and the end plate 121.
Of course, the heat conductive layer 800 may be directly fixed by the connection between the access cover 130 and the end plate 121, instead of being bonded to the fuse 700 or the access cover 130 in advance, so that the heat conductive layer 800 may be sandwiched between the fuse 700 and the access cover 130.
It can be understood that the adhesive used when the heat conducting layer 800 is fixed in advance may be a heat conducting silica gel or the like, so as to ensure that the fuse 700 and the access cover 130 have better heat transfer efficiency, and simultaneously ensure the insulation performance between the fuse 700 and the access cover 130, so as to ensure the electricity safety of the energy storage device, and of course, the adhesive used when the heat conducting layer 800 is fixed in advance may also be a conventional heat conducting gel, and at this time, an insulating film layer (or insulating plating layer) is arranged on the inner surface of the access cover 130, so as to ensure the electrical insulation between the fuse 700 and the access cover 130, thereby ensuring the electricity safety of the energy storage device.
As shown in fig. 3, the energy storage device 1 further includes two conductive members 910, wherein one end of each conductive member 910 is electrically connected to the fuse 700, the other end of one conductive member 910 is electrically connected to the battery module 200, and the other end of the other conductive member 910 is electrically connected to the total positive output terminal 920 or the total negative output terminal 930 of the battery pack. In other words, the fuse 700 is connected in series in the output circuit of the battery module 200 through the two conductive members 910.
As shown in fig. 3, the access cover 130 is detachably connected to the end panel 121 at the outside of the case 100.
In the embodiment of the present application, the access cover 130 is detachably connected to the end panel 121 outside the case 100, so that an operator can conveniently disassemble and assemble the access cover 130 outside the case 100, thereby improving the disassembly and assembly efficiency of the access cover 130.
Of course, in other embodiments, access cover 130 may be configured to be movably coupled to the end plate surface, such as rotatably, slidably, etc., and be capable of closing access opening 1211.
Further, when the access cover 130 is detachably coupled to the end panel 121, the access cover 130 is coupled to the end panel 121 by bolts.
In the embodiment of the application, the access cover 130 is connected with the end panel 121 through bolts, on one hand, the bolts allow repeated disassembly and assembly, are convenient to overhaul and do not need to damage the connecting structure, and on the other hand, after the bolts are locked, stable clamping force can be provided, and the sealing gasket is matched for use, so that the sealing performance of the access cover 130 for sealing the access opening 1211 is remarkably improved.
In one embodiment, as shown in fig. 3, the side of the access cover 130 facing the battery module 200 has a receiving space 131, and a portion of the fuse 700 protrudes from the outer surface of the end panel 121 through the access hole 1211 and is received in the receiving space 131. Wherein the outer surface of the end plate 121 refers to the surface of the end plate 121 facing away from the receiving cavity 101.
On the one hand, the part of the fuse 700 extends out of the outer surface of the end panel 121 to be more beneficial to heat dissipation of the fuse 700, on the other hand, the end panel of the battery pack of the related art is usually provided with components such as a high-voltage plug connector, an explosion-proof valve, a liquid cooling joint and the like, which occupy the space in the length direction of the battery pack, while the access cover 130 of the embodiment of the application is provided with the accommodating space 131, and the part of some electric functional components including the fuse 700 can be accommodated in the accommodating space 131 through the access hole 1211, so that the space utilization rate of the battery pack is improved, and the energy storage density of the energy storage device is further improved.
As shown in fig. 2 and 3, a side surface of the access cover 130 facing away from the battery module 200 is provided with a protrusion 132, and a surface of the receiving space 131 facing the battery module 200 from the access cover 130 is recessed inward of the protrusion 132 in a thickness direction of the access cover 130.
In the embodiment of the present application, a thinner plate material may be selected and the access cover 130 is processed through a stamping process, so that one side of the access cover 130 has the protrusion 132 and the other side has the receiving space 131, and the thickness of the access cover 130 does not need to be designed thicker in order to design the receiving space 131 on one side of the access cover 130, thereby saving material cost.
In one embodiment, the mounting bracket 600 is made of an insulating material, thus improving the electrical safety of the energy storage device.
As shown in fig. 4 and 5, the mounting bracket 600 includes a connection portion 610 and a mounting portion 620, and the connection portion 610 is fixedly assembled on the bottom plate 122 of the base 120. Further, the connection portion 610 is fixedly coupled to the cross member of the base 120 by bolts. The mounting portion 620 is connected with the connecting portion 610, and has a receiving groove 621, a notch of the receiving groove 621 faces away from the receiving cavity 101, and the fuse 700 is fixedly disposed in the receiving groove 621.
In the embodiment of the application, the accommodating groove 621 can protect the fuse 700 and prevent the fuse 700 from being knocked during assembly of other components.
Further, a portion of the mounting portion 620 protrudes from the outer surface of the end panel 121 through the access hole 1211 and is accommodated in the accommodating space 131, and a portion of the mounting portion 620 protruding from the outer surface of the end panel 121 forms a notch of the accommodating groove 621.
In the embodiment of the application, since the part of the mounting part 620 is located on the outer surface of the end panel 121 and is accommodated in the accommodating space 131, the space utilization of the battery pack is improved, and the energy storage density of the energy storage device is further improved.
With continued reference to fig. 4 and 5, the energy storage device 1 further includes a first locking member 500, where the first locking member 500 locks the fuse 700 in the receiving slot 621.
Where "locking" refers to the releasable connection between the components by fasteners, such as, but not limited to, bolts.
In the embodiment of the application, the fuse 700 and the mounting bracket 600 are locked by the first locking piece 500, so that not only is the connection firmness of the fuse 700 and the mounting bracket 600 ensured, but also the fuse 700 is convenient to detach from the mounting bracket 600, and the maintenance efficiency of the fuse 700 is improved.
Further, a locking structure 622 is convexly provided at the bottom of the receiving groove 621, the locking structure 622 includes a wrapping portion 6221 and a second locking member 6222 embedded in the wrapping portion 6221, the first locking member 500 is screwed with the second locking member 6222 to lock the fuse 700 with the mounting portion 620, the first locking member 500 and the second locking member 6222 are made of metal materials, and the mounting bracket 600 and the wrapping portion 6221 are made of insulating materials.
In the embodiment of the application, the second locking member 6222 is embedded in the wrapping portion 6221, so that the first locking member 500 and the second locking member 6222 can be made of metal materials, the locking strength is ensured to ensure the locking stability of the fuse 700 and the mounting portion 620, and the mounting bracket 600 and the wrapping portion 6221 can be made of insulating materials, thereby improving the electrical insulation of the mounting bracket 600.
Wherein the locking structure 622 and the mounting bracket 600 may be formed by an in-mold injection molding process. For example, the second locking member 6222 is a metal insert, and the mounting bracket 600 and the locking structure 622 are integrally formed by an injection molding process.
Of course, the processing may be performed by a press-fit method. For example, the wrap 6221 and mounting bracket 600 are formed by an injection molding process, after which the second locking member 6222 is pressed into the wrap 6221.
In one embodiment, one of the first lock 500 and the second lock 6222 is a screw and the other is a nut.
As shown in fig. 4 and 5, the first locking member 500 is a screw and the second locking member 6222 is a nut, although in another embodiment, the first locking member 500 is a nut and the second locking member 6222 is a screw.
As shown in fig. 4 and 5, two locking structures 622 are protruding from the bottom surface of the accommodating groove 621, and the number of the first locking pieces 500 is two, so that the two first locking pieces 500 can be locked with the two locking structures 622, respectively.
The fuse 700 includes a fuse body 710 located between two locking structures 622 and two terminals 720, the heat conductive layer 800 being sandwiched between the fuse body 710 and the access cover 130, the two terminals 720 being provided on two opposite end surfaces of the fuse body 710, respectively. One end of each of the two conductive members 910 is electrically connected to two connection terminals 720, and the two first locking members 500 are respectively screwed to two locking structures 622, so as to lock two sets of corresponding conductive members 910 and connection terminals 720.
In the embodiment of the application, two first locking pieces 500 lock the fuse 700 on the mounting bracket 600 and simultaneously connect the fuse 700 into the circuit of the battery module 200 through two conductive pieces 910, namely, the first locking pieces 500 have not only the function of mechanical connection but also the function of electrical connection, and one component has two functions at the same time, thereby saving the cost and being beneficial to improving the dismounting efficiency of the fuse 700.
In one embodiment, the connection terminal 720 has a first through hole 721, the conductive member 910 corresponding to the connection terminal 720 has a second through hole 911, and the first locking member 500 passes through the first through hole 721 and the second through hole 911 and is locked with the second locking member 6222 of the locking structure 622.
Of course, the mounting manner of the fuse 700 and the mounting bracket 600 is not limited thereto. For example, in other embodiments, the first locking member 500 is only used to lock the fuse 700 to the mounting bracket 600, and the electrical connection to the conductive member 910 and the connection terminal 720 is accomplished by other means.
As shown in fig. 4 and 5, the groove side walls of the receiving groove 621 have a bottom side wall 624, a top side wall 625, and two end side walls 626, the bottom side wall 624 and the top side wall 625 being disposed opposite to each other in the height direction of the battery module 200, and the two end side walls 626 being disposed opposite to each other in the width direction of the battery module 200. Wherein the bottom sidewall 624 is located between the bottom plate 122 and the fuse 700.
In the embodiment of the present application, since the bottom sidewall 624 is located between the bottom plate 122 and the fuse 700, the bottom sidewall 624 can support and position the fuse 700 when the fuse 700 and the mounting bracket 600 are assembled, so that the first locking member 500 is convenient for locking the fuse 700 on the mounting bracket 600.
In one embodiment, as shown in fig. 4, the bottom sidewall 624 is concaved toward the battery module 200 to form two avoidance grooves 623, and the two conductive members 910 are respectively inserted into the two avoidance grooves 623.
In the embodiment of the application, the bottom side wall 624 is concaved inwards towards the battery module 200 to form the avoidance groove 623, and the conductive element 910 can extend into the accommodating groove 621 from the side of the bottom side wall 624 facing away from the fuse 700 through the avoidance groove 623, so that the length of the conductive element 910 can be reduced, and the material cost can be reduced.
As shown in fig. 4, the conductive member 910 has a bent portion 912, and the bent portion 912 is located on a side of the bottom sidewall 624 facing away from the fuse 700.
In the embodiment of the application, the bending portion 912 of the conductive member 910 is located at the side of the bottom sidewall 624 facing away from the fuse 700, and the bending portion 912 is gradually away from the bottom sidewall 624 under the action of gravity, so that the conductive member 910 is not in extrusion contact with the wall of the accommodating groove 621, thereby avoiding damaging the insulating film outside the conductive member 910 due to continuous friction between the conductive member 910 and the wall of the accommodating groove 621, and reducing the risk of short circuit of the conductive member 910.
As shown in fig. 6 and 7, the bottom sidewall 624 has a first protrusion 6241 protruding from a side surface of the fuse body 710 facing away from the battery module 200, the top sidewall 625 has a second protrusion 6251 protruding from a side surface of the fuse body 710 facing away from the battery module 200, and at least a portion of the heat conductive layer 800 is defined between the first protrusion 6241 and the second protrusion 6251.
In the embodiment of the application, the first protruding portion 6241 and the second protruding portion 6251 protrude from the surface of the fusing body 710 facing away from the battery module 200, and when the heat conducting layer 800 needs to be pre-adhered to the fusing body 710, the space between the first protruding portion 6241 and the second protruding portion 6251 can mount and position the heat conducting layer 800, so as to prevent the heat conducting layer 800 from moving relative to the fusing body 710 in the arrangement direction of the first protruding portion 6241 and the second protruding portion 6251.
As shown in fig. 8 and 9, a reinforcing structure 630 is further provided around each of the locking structures 622, and the reinforcing structure 630 is connected between the locking structure 622 and the groove wall of the receiving groove 621.
In the embodiment of the present application, the reinforcing structure 630 is connected around the locking structure 622, so that the structural strength of the locking structure 622 is improved, and further, the torsional strength of the locking structure 622 when the first locking member 500 and the locking structure 622 are locked is improved, and the stability of the fuse 700 assembled in the accommodating groove 621 is improved.
Further, the reinforcing structure 630 includes a first rib 631 and a second rib 632 connected between the locking structure 622 and the slot wall of the receiving slot 621, the first rib 631 extends along the height direction of the battery module 200, the second rib 632 extends along the width direction of the battery module 200, the first rib 631 has a first limit portion 6311, the second rib 632 has a second limit portion 6321, wherein the two first limit portions 6311 are respectively located at the same side of the two connection terminals 720, and the two second limit portions 6321 are respectively located at two sides of the two connection terminals 720 opposite to each other along the width direction of the battery module 200.
In the embodiment of the application, the two first limiting portions 6311 can limit the two connection terminals 720 of the fuse 700 in the height direction of the battery module 200, and the two second limiting portions 6321 can limit the two connection terminals 720 of the fuse 700 in the width direction of the battery module 200, so that the two connection terminals 720 of the fuse 700 are aligned with the two locking structures 622 quickly, and the assembly efficiency of the fuse 700 is improved.
As shown in fig. 10, the present application further provides an electric device 5, which includes the energy storage device 1 of any one of the embodiments, where the energy storage device 1 is used to supply power to the electric device 5.
It will be appreciated that the various embodiments/implementations provided by the application may be combined with one another without conflict and are not illustrated here.
In the examples of the application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and the term "plurality" is intended to refer to two or more unless otherwise expressly defined. The terms "mounted," "connected," "secured," and the like are to be construed broadly, as they are used in a fixed or removable connection, or as they are integral with one another, as they are directly or indirectly connected through intervening media. The specific meaning of the terms in the examples of application will be understood by those of ordinary skill in the art as the case may be.
In the description of the application embodiments, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the application embodiments and simplifying the description, and do not indicate or imply that the devices or units to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the application embodiments.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an application embodiment. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the application embodiment, and is not intended to limit the application embodiment, and various modifications and changes may be made to the application embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application should be included in the protection scope of the embodiments of the application.
Claims (13)
1. An energy storage device, comprising:
the box body comprises an upper cover, a base and an access cover, wherein the upper cover is connected with the base and encloses a containing cavity, one of the upper cover and the base is provided with an end panel, the end panel is provided with an access hole penetrating through the upper cover, the access hole is communicated with the containing cavity, and the access cover is configured to cover the access hole;
The battery module is positioned in the accommodating cavity;
The mounting bracket is positioned in the accommodating cavity and fixedly connected with the base, the mounting bracket comprises a mounting part, the mounting part is provided with an accommodating groove, the notch of the accommodating groove faces away from the accommodating cavity, and two locking structures are convexly arranged on the bottom surface of the accommodating groove;
The fuse is positioned in the accommodating cavity, assembled in the accommodating groove and electrically connected with the battery module, and at least part of the fuse is exposed at the overhaul hole; the fuse comprises a fusing body positioned between the two locking structures and two wiring terminals respectively arranged on two opposite end surfaces of the fusing body;
the heat conduction layer is clamped between the fusing body and the access cover;
two conductive members electrically connected to the two connection terminals, respectively, one of the conductive members being electrically connected to the battery module, and
The two first locking pieces are respectively connected with the two locking structures in a threaded manner so as to lock the two groups of corresponding conductive pieces and the wiring terminals and lock the fuse in the accommodating groove;
The battery module comprises a battery module body, a plurality of connecting terminals, a plurality of locking structures, a plurality of connecting terminals, a plurality of reinforcing structures, a plurality of first ribs and a plurality of second ribs, wherein the reinforcing structures are arranged around each locking structure and are connected between the locking structure and the groove wall of the accommodating groove, each reinforcing structure comprises a first rib and a second rib, the first ribs are connected between the locking structure and the groove wall of the accommodating groove, the first ribs extend in the height direction of the battery module body, the second ribs extend in the width direction of the battery module body, the first ribs are provided with first limiting parts, the second ribs are provided with second limiting parts, the two first limiting parts are respectively located on the same side of the two connecting terminals, and the two second limiting parts are respectively located on two sides of the two connecting terminals opposite to each other in the width direction of the battery module body.
2. The energy storage device of claim 1, wherein said access cover is removably attached to said end panel.
3. The energy storage device of claim 1, wherein a side of the access cover facing the battery module has a receiving space, and a portion of the fuse protrudes through the access opening to the outer surface of the end panel and is received in the receiving space.
4. The energy storage device according to claim 3, wherein a side surface of the access cover facing away from the battery module is provided with a protrusion, and the accommodation space is recessed inward of the protrusion in a thickness direction of the access cover from a surface of the access cover facing the battery module.
5. The energy storage device of claim 1, wherein a side of the access cover facing the battery module has an accommodating space, a portion of the mounting portion protrudes from an outer surface of the end panel through the access opening and is accommodated in the accommodating space, and a portion of the mounting portion protruding from the outer surface of the end panel forms a notch of the accommodating groove.
6. The energy storage device of claim 1, wherein the locking structure comprises a wrapping portion and a second locking piece embedded in the wrapping portion, the first locking piece being threadably connected to the second locking piece to lock the fuse with the mounting portion.
7. The energy storage device of claim 6, wherein said first and second locking members are made of a metallic material and said mounting bracket and said wrap are made of an insulating material.
8. The energy storage device of claim 1, wherein the base comprises a bottom plate, the battery module is assembled on the bottom plate, a groove side wall of the accommodating groove is provided with a bottom side wall located between the bottom plate and the fuse, the bottom side wall is concavely formed into two avoidance grooves towards the direction of the battery module, and the two conductive pieces are respectively arranged in the two avoidance grooves in a penetrating manner.
9. The energy storage device of claim 8, wherein the conductive member has a bent portion, the bent portion being located on a side of the bottom sidewall facing away from the fuse.
10. The energy storage device of claim 1, wherein the base includes a bottom plate on which the battery module is assembled, and the slot side walls of the receiving slot have bottom side walls between the bottom plate and the fuse.
11. The energy storage device of claim 10, wherein the energy storage device comprises a housing,
The bottom side wall is provided with a first extending part, and the first extending part extends out of the surface of one side of the fusing body, which is opposite to the battery module;
The side wall of the accommodating groove is also provided with a top side wall which is opposite to the bottom side wall along the height direction of the battery module, the top side wall is provided with a second extension part, and the second extension part extends out of the surface of one side of the fusing body, which is opposite to the battery module;
At least a portion of the thermally conductive layer is defined between the first extension and the second extension.
12. The energy storage device of any of claims 1-4, wherein the mounting bracket is made of an insulating material.
13. A powered device comprising an energy storage device according to any of claims 1-12, the energy storage device being configured to power the powered device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510902984.0A CN120432837B (en) | 2025-07-01 | 2025-07-01 | Energy storage device and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510902984.0A CN120432837B (en) | 2025-07-01 | 2025-07-01 | Energy storage device and electric equipment |
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| CN120432837B true CN120432837B (en) | 2025-09-30 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208000958U (en) * | 2018-04-19 | 2018-10-23 | 宁德时代新能源科技股份有限公司 | Battery pack |
| CN113793788A (en) * | 2020-05-28 | 2021-12-14 | 郑州宇通集团有限公司 | Battery boxes, service switches and their plugs |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205543025U (en) * | 2015-11-18 | 2016-08-31 | 深圳市沃特玛电池有限公司 | Battery module structure |
| CN215771460U (en) * | 2021-08-23 | 2022-02-08 | 比亚迪股份有限公司 | Battery pack |
| CN219226212U (en) * | 2023-01-04 | 2023-06-20 | 清安储能技术(重庆)有限公司 | Fuse protection structure |
| CN222190617U (en) * | 2024-02-21 | 2024-12-17 | 福建龙净蜂巢储能科技有限公司 | An integrated fuse protection device |
| CN222941101U (en) * | 2024-07-05 | 2025-06-03 | 武汉亿纬储能有限公司 | Heat dissipation structure and battery pack |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208000958U (en) * | 2018-04-19 | 2018-10-23 | 宁德时代新能源科技股份有限公司 | Battery pack |
| CN113793788A (en) * | 2020-05-28 | 2021-12-14 | 郑州宇通集团有限公司 | Battery boxes, service switches and their plugs |
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