Energy storage device and power supply system

Abstract

The application discloses an energy storage device and a power supply system, and relates to the technical field of energy storage. The energy storage device comprises a battery box body and a battery module. The battery box body comprises a lower box body and a box cover, and the battery module is accommodated in the accommodating cavity. The lower box body comprises a bottom beam and a liquid cooling plate. The bottom beam is annular and comprises a front end beam, a rear end beam and a pair of side edge beams. The liquid cooling plate is fixedly connected with the bottom surface of the bottom beam. The liquid cooling plate has a liquid inlet and a liquid outlet. The liquid inlet and the liquid outlet are located on the same side of the front end beam along the length direction of the battery box body and along the width direction of the battery box body. In the application, the concentrated arrangement of the liquid inlet and the liquid outlet can shorten the path length of the liquid cooling pipeline and the liquid inlet and the liquid outlet, thereby avoiding the local drooping of the liquid cooling pipeline and ensuring the sealing reliability of the connection between the liquid cooling pipeline and the liquid inlet and the liquid outlet of the liquid cooling plate.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more specifically, to an energy storage device and a power supply system. Background Technology

[0002] Currently, existing battery packs consist of a battery housing and battery modules housed within the housing. The battery packs are typically assembled in a prefabricated compartment, where the battery modules are cooled via liquid cooling pipes connecting the liquid cooling unit and the battery pack within the prefabricated compartment, ensuring that the battery modules are charged and discharged at appropriate temperatures.

[0003] The bottom of the battery box usually includes a liquid cooling plate, which has a liquid inlet and a liquid outlet, and the liquid inlet and liquid outlet are connected to the liquid cooling pipeline (liquid inlet pipeline and liquid outlet pipeline).

[0004] Regarding the connection between the liquid cooling plate and the liquid cooling pipeline in the relevant technology, the technicians found that the connection between the liquid inlet and / or outlet of some liquid cooling plates and the liquid cooling pipeline is prone to loosening, causing leakage, which increases the safety hazards of assembling the battery pack in the prefabrication compartment. Utility Model Content

[0005] A primary objective of this application is to provide an energy storage device and power supply system that can improve assembly yield.

[0006] To achieve the above-mentioned objectives, this application adopts the following technical solution:

[0007] According to one aspect of this application, an energy storage device is provided, comprising: a battery housing including a lower housing and a housing cover, the lower housing and the housing cover being closed and forming a receiving cavity; the lower housing including a bottom beam and a liquid cooling plate, the bottom beam being annular and including a front end beam and a rear end beam distributed opposite to each other along the length direction of the battery housing, and a pair of side beams distributed opposite to each other along the width direction of the battery housing, the liquid cooling plate being fixedly connected to the bottom surface of the bottom beam, the liquid cooling plate having a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet being located on the side of the liquid cooling plate near the front end beam along the length direction of the battery housing, and on the same side of the liquid cooling plate along the width direction of the battery housing; and a battery module, housed in the receiving cavity and supported and fixed on the bottom beam.

[0008] In this embodiment, by centrally setting the inlet and outlet of the liquid cooling plate, a battery box containing battery modules can be assembled in a prefabricated compartment (such as a battery cabinet). When connecting the liquid cooling pipes to the inlet and outlet of the liquid cooling plate, the path length of the liquid cooling pipes is shortened, especially the length of the suspended section connecting the liquid cooling pipes to the liquid cooling plate. This avoids local sagging of the liquid cooling pipes, ensures the sealing reliability of the connection between the liquid cooling pipes and the inlet and outlet of the liquid cooling plate, and thus improves the assembly yield of the battery box in the prefabricated compartment.

[0009] According to one embodiment of this application, the liquid cooling plate has a protrusion located outside the receiving cavity, and both the liquid inlet and the liquid outlet are located on the protrusion.

[0010] In this embodiment, by setting the liquid inlet and outlet outside the battery box, not only is the setting of the clearance hole on the lower box (such as the front beam) eliminated, reducing the design complexity of the lower box and ensuring the sealing effect of the lower box, but it also enables electro-hydraulic isolation between the battery module and the liquid cooling plate. Even if the liquid inlet and outlet of the liquid cooling plate leak, it will not affect the charging and discharging of the battery module, thereby improving the safety of the battery module charging and discharging.

[0011] According to one embodiment of this application, the liquid inlet and the liquid outlet are distributed at intervals along the width or length direction of the battery housing.

[0012] In this embodiment, the liquid inlet and outlet of the liquid cooling plate are spaced apart along the length of the front beam to reduce the size of the protruding part of the liquid cooling plate extending beyond the front beam in the length of the battery box, thereby reducing the overall size of the battery box in the length direction. This facilitates reducing interference between the protruding part and other structural components, thus facilitating assembly within the prefabricated compartment of the battery box. Alternatively, the liquid inlet and outlet of the liquid cooling plate are spaced apart along the length of the battery box to further shorten the length of the suspended section connecting the liquid cooling pipe to the liquid cooling plate, thereby effectively preventing local sagging of the liquid cooling pipe and ensuring the sealing reliability of the connection between the liquid cooling pipe and the liquid inlet and outlet of the liquid cooling plate.

[0013] According to one embodiment of this application, the protrusion is located on one side of the battery housing along the width direction.

[0014] In this embodiment, when a local area of ​​the liquid cooling plate extends beyond the front beam and away from the rear beam, it is convenient to save on the material used for the liquid cooling plate. At the same time, it can achieve foolproof assembly when the liquid cooling plate is fixed to the bottom beam, and can also reduce interference that occurs when the battery box is assembled in the prefabrication compartment, thereby improving the assembly efficiency of the battery box.

[0015] According to one embodiment of this application, the energy storage device includes a plurality of battery modules, and the plurality of battery modules are arranged at intervals along the width direction of the battery housing; the liquid cooling plate has multiple liquid cooling channels distributed along the width direction of the battery housing, the multiple liquid cooling channels correspond one-to-one with the plurality of battery modules, and the multiple liquid cooling channels include multiple liquid inlet channels and one liquid outlet channel, the multiple liquid inlet channels are all connected to the liquid inlet and the liquid outlet channel, and the liquid outlet channel is connected to the liquid outlet.

[0016] In this embodiment, each liquid cooling channel can cool a corresponding battery module, thereby ensuring the cooling effect of the liquid cooling plate on multiple battery modules. At the same time, by adjusting the number of inlet and outlet channels in the multiple liquid cooling channels, it is easy to ensure the uniformity of cooling of multiple battery modules by the multiple liquid cooling channels, thereby ensuring the cooling effect of multiple battery modules.

[0017] According to one embodiment of this application, in the width direction of the battery housing, the liquid inlet and the liquid outlet are located on the side of the liquid cooling plate closer to the liquid outlet channel; the multiple liquid inlet channels include a first liquid inlet channel adjacent to the liquid outlet channel, and at least one second liquid inlet channel located on the side of the first liquid inlet channel away from the liquid outlet channel, the first liquid inlet channel and the liquid inlet have a first sub-channel between them, and the second liquid inlet channel and the liquid inlet have multiple second sub-channels between them.

[0018] In this embodiment, for the second liquid inlet channel which is far from the liquid inlet, the arrangement of multiple second sub-channels facilitates the increase of the channel area between the liquid inlet and the second liquid inlet channel, thereby ensuring the uniformity of cooling of the corresponding battery modules by the first liquid inlet channel and the second liquid inlet channel.

[0019] According to one embodiment of this application, the lower housing includes a support beam located between a pair of side beams, and the two ends of the support beam are respectively fixedly connected to the pair of side beams. The battery module is supported and fixed on the bottom beam and the support beam.

[0020] In this embodiment, the supporting beams facilitate the improvement of the structural strength of the lower housing, thereby ensuring the reliability of the load-bearing capacity of the battery module.

[0021] According to one embodiment of this application, the energy storage device includes a plurality of battery modules, and each pair of adjacent battery modules is fixedly connected to a fixing plate.

[0022] In this embodiment, the fixing plate is used to lock and bind multiple battery modules inside the battery box, thereby distributing the force on the battery modules among them and making the force on each battery module more uniform. At the same time, the locking and binding of multiple battery modules helps to improve the impact resistance of the energy storage device and improve the stability of the battery modules fixed inside the battery box.

[0023] According to one embodiment of this application, the battery module includes a fixing bolt and a pair of fixing end plates disposed opposite each other, and a plurality of battery cells between the pair of fixing end plates; the fixing plate and the fixing end plate have coaxial fixing holes, and the fixing bolt passes through the first fixing hole on the fixing plate and the fixing end plate and is fixed to the bottom of the lower housing.

[0024] In this embodiment, the fixing bolts can pass through the first fixing holes on the fixing plate and the fixing end plate and be fixedly connected to the bottom beam or support beam, so as to facilitate the fixed installation of the fixing plate on the fixing end plate and reduce the use of parts.

[0025] According to one embodiment of this application, a plurality of battery modules form a plurality of gaps in the width direction of the battery housing; the plurality of gaps include edge gaps adjacent to the side beams and intermediate gaps located between two edge gaps, wherein the gap width of the intermediate gap is greater than the gap width of the edge gaps.

[0026] In this embodiment, the relatively wide central seam facilitates improved heat dissipation for the two battery modules forming the central seam, thereby ensuring the overall heat dissipation of multiple battery modules within the battery box.

[0027] According to one embodiment of this application, a slider is provided on the surface edge of the liquid cooling plate facing away from the bottom beam, and a plurality of the sliders are distributed along the length direction of the battery box.

[0028] In this embodiment of the application, when assembling the battery box in the prefabricated compartment, the arrangement of multiple sliders facilitates the reduction of the contact area between the battery box and the battery bracket in the prefabricated compartment, thereby reducing the friction during battery box assembly and facilitating battery box assembly. In addition, the individually arranged sliders facilitate the replacement of the sliders when they are worn or aged.

[0029] According to one embodiment of this application, the slider, the liquid cooling plate, and the bottom beam have a coaxial second fixing hole.

[0030] In this embodiment, the slider, liquid cooling plate, and bottom beam can be simultaneously fixed based on the fastener, which facilitates the installation of the slider and reduces the number of parts used.

[0031] According to one embodiment of this application, the orthographic projection of the slider in the width direction of the battery box is an inverted trapezoid, and the slider is made of a non-metallic material.

[0032] In this embodiment, the slider made of non-metallic material can reduce the hard contact between the slider and the battery holder, thereby reducing the friction between the slider and the battery holder and reducing scratches on the battery holder.

[0033] According to one aspect of this application, a power supply system is provided, the power supply system including electrical equipment and the energy storage device described in the above aspect, the energy storage device supplying power to the electrical equipment.

[0034] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0035] The above and other features and advantages of this application will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of an energy storage system according to an exemplary embodiment.

[0037] Figure 2 This is an exploded structural diagram of an energy storage device according to an exemplary embodiment.

[0038] Figure 3 Example Figure 2 The diagram shows a partially enlarged structural schematic of the energy storage device.

[0039] Figure 4 This is an exploded view of a battery housing from an axial side according to an exemplary embodiment.

[0040] Figure 5 Example Figure 4 The diagram shows a partially enlarged view of the battery housing.

[0041] Figure 6 This is an exploded top view of a battery housing according to an exemplary embodiment.

[0042] Figure 7 Example Figure 6 The diagram shows a partially enlarged view of the battery housing.

[0043] Figure 8 This is a bottom view of an energy storage device according to an exemplary embodiment.

[0044] Figure 9This is a top view of a battery module according to an exemplary embodiment.

[0045] Figure 10 Example Figure 9 The diagram shows a partially enlarged structural schematic of the battery module.

[0046] Figure 11 This is a schematic diagram of a power supply system according to an exemplary embodiment.

[0047] The reference numerals in the attached figures are explained as follows:

[0048] 100. Energy storage devices; 200. Power conversion devices; 300. High-voltage cables; 400. Power supply systems; 410. Electrical equipment;

[0049] 10. Battery housing; 20. Battery module; X, length direction; Y, width direction;

[0050] 11. Lower box body; 12. Box lid; 13. Fixing plate;

[0051] 111. Bottom beam; 112. Support beam; 113. Liquid cooling plate; 114. Front beam; 115. Rear beam; 116. Side beam; 117. Slider;

[0052] 1111, Second fixing hole; 1112, Sol-gel tank;

[0053] 1131. Liquid inlet; 1132. Liquid outlet; 1133. Extension; 1134. Liquid cooling channel; 1135. Liquid inlet channel; 1136. Liquid outlet channel;

[0054] 11351, First inlet channel; 11352, Second inlet channel; 11353, First sub-channel; 11354, Second sub-channel;

[0055] 21. Battery cell; 22. Fixing end plate; 23. Binding component; 24. Fixing bolt; 25. First fixing hole; 26. Spacing joint; 27. Middle joint; 28. Edge joint;

[0056] 210. First conversion device; 220. Second conversion device. Detailed Implementation

[0057] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application 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 therefore their detailed description will be omitted.

[0058] Because the energy people need is highly time- and space-dependent, in order to make rational use of energy and improve energy efficiency, it is necessary to use a medium or device to store one form of energy in the same way or by converting it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0059] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0060] Taking electrochemical energy storage as an example, this solution provides an energy storage device for use in energy storage systems. The energy storage device is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage media. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage media. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0061] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include:

[0062] (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can assist renewable energy power generation in meeting grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the absorption capacity of renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0063] (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and grid congestion relief. In terms of peak shaving, they can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption.

[0064] (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity charges. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0065] Figure 1 This is a schematic diagram of an energy storage system provided in this application. The energy storage system is illustrated using a shared energy storage scenario on the generation / distribution side as an example. However, the energy storage device 100 in this application is not limited to a shared energy storage scenario on the generation / distribution side. Figure 1 As shown, the energy storage system includes an energy storage device 100, an energy conversion device 200, and a high-voltage cable 300.

[0066] In some embodiments of the power generation scenario, the power conversion device 200 includes a first conversion device 210 (such as a wind power conversion device 200). Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device 200 can be stored in an energy storage device 100. The energy storage device 100 is connected to the high-voltage cable 300, and can simultaneously output smooth electricity to the distribution side for use, achieving peak shaving and frequency regulation, and ensuring stable grid operation. Alternatively, the wind power conversion device 200 can be directly connected to the high-voltage cable 300. Under normal power generation conditions, through… The high-voltage cable 300 supplies the power output from the wind power conversion device 200 to the distribution side. When the current power load is low and the wind power conversion device 200 generates excess power, the excess power is first stored in the energy storage device 100 to improve the problem of new energy power generation absorption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 100 together with the high-voltage cable 300 in grid-connected mode to supply the power to the distribution side. This provides the power grid with multiple services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0067] In some embodiments on the distribution network side, the power conversion device 200 includes a second conversion device 220 (such as a photovoltaic power conversion device 200), and the energy storage device 100 is connected to the photovoltaic power conversion device 200 and installed downstream of the high-voltage cable 300 between the user load and the device. The electrical energy output by the photovoltaic power conversion device 200 is stored in the energy storage device 100, which can act as a backup power source in a timely manner when the power grid / distribution network experiences a fault; or, it can provide power support to alleviate line congestion when the high-voltage cable 300 transmission line experiences line congestion, and to delay the economic pressure caused by power grid / distribution capacity expansion during planned expansion of the power grid.

[0068] Optionally, the power conversion device 200 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy. For example, the power conversion device 200 may include, but is not limited to, photovoltaic power conversion devices, wind power conversion devices 200, etc.

[0069] Optionally, the energy storage device 100 can be used in, but is not limited to, energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems 400, and is also applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0070] Optionally, the energy storage device 100 may include, but is not limited to, battery packs, battery clusters, mobile power supplies, energy storage cabinets / containers, and other battery integrated systems composed of individual battery cells 21. The actual application form of the energy storage device 100 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 100.

[0071] Optionally, the energy storage device 100 may include battery cells 21 that are, but are not limited to, at least one of cylindrical, prismatic, prismatic, or other shaped batteries. Battery cell 21 may be a rechargeable battery, meaning a battery cell 21 that can be recharged after discharge to activate its active materials and continue to be used. Battery cell 21 may be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit its use.

[0072] In some implementations, such as Figure 2 As shown, the energy storage device 100 includes a battery box 10 and a battery module 20. The battery box 10 includes a lower box 11 and a box cover 12. The box cover 12 covers the lower box 11 and forms a receiving cavity. The battery module 20 is fixed in the receiving cavity of the battery box 10.

[0073] The battery modules 20 fixed in the cavity of the battery housing 10 can be one, two, four, eight, etc., and the more battery modules 20 there are, the higher the capacity of the energy storage device 100, thus making it easier to meet market demands. For example, four battery modules 20 are distributed along the width Y direction of the battery housing 10 in the cavity of the battery housing 10.

[0074] It should be noted that the above Figure 2 The energy storage device 100 is shown in the form of a battery pack. When the energy storage device 100 is a battery cabinet, it also includes a prefabricated compartment (such as a battery cabinet or energy storage box). A liquid cooling unit is installed in the prefabricated compartment, and the liquid cooling unit is connected to a liquid cooling pipeline to cool the battery modules 20 inside the battery box 10 through the circulating fluid in the liquid cooling pipeline, so as to ensure that the battery modules 20 inside the battery box 10 are charged and discharged at a suitable temperature.

[0075] In some implementations, such as Figure 2 As shown, the battery module 20 includes a pair of fixed end plates 22 disposed opposite to each other, and a plurality of battery cells 21 between the pair of fixed end plates 22.

[0076] Multiple battery cells 21 and a pair of fixed end plates 22 can be secured using cable ties or other binding materials 23. Additionally, as... Figure 2 and Figure 3 As shown, the battery module 20 also includes a fixing bolt 24. The fixing end plate 22 has a first fixing hole 25. The fixing bolt 24 passes through the first fixing hole 25 and is detachably connected to the lower housing 11 to fix the battery module 20 in the battery housing 10.

[0077] The fixed end plate 22 can be a plate structure made of metal or a plate structure made of thermoplastic plastic. When the fixed end plate 22 is a plate structure made of metal, an insulating base is fixed on the fixed end plate 22, and the output electrode connecting piece connected to the battery cell 21 is limited on the insulating base to ensure electrical insulation between the output electrode connecting piece and the fixed end plate 22.

[0078] In some implementations, such as Figure 4 As shown, the lower housing 11 includes a bottom beam 111 and a liquid cooling plate 113. The bottom beam 111 is annular, and the liquid cooling plate 113 is fixedly connected to the bottom surface of the bottom beam 111.

[0079] The battery module 20 is supported and fixed on the bottom beam 111; the bottom beam 111 can be formed into a rectangular ring, as shown below. Figure 4As shown, the bottom beam 111 includes a front beam 114, a rear beam 115 and a pair of side beams 116. The front beam 114 and the rear beam 115 are distributed relative to each other along the length direction X of the battery box 10, and the pair of side beams 116 are distributed relative to each other along the width direction Y of the battery box 10. The two ends of the front beam 114 and the two ends of the rear beam 115 are respectively fixedly connected to the ends of the pair of side beams 116.

[0080] The fixing of the liquid cooling plate 113 to the bottom beam 111 can be as follows: Figure 5 As shown, the liquid cooling plate 113 and the bottom beam 111 have a coaxial second fixing hole 1111. A fastener (such as a fixing bolt 24, rivet, etc.) (not shown in the figure) can pass through the second fixing hole 1111 to achieve a fixed connection between the liquid cooling plate 113 and the bottom beam 111. This avoids welding deformation of the liquid cooling plate 113, ensures the flatness of the liquid cooling plate 113, and thus ensures good sealing between the liquid cooling plate 113 and the bottom beam 111.

[0081] Furthermore, such as Figure 5 As shown, the bottom surface of the bottom beam 111 has a sol-gel tank 1112, which is used to further fix the liquid cooling plate 113 to the bottom beam 111 through the adhesive in the sol-gel tank 1112, thereby ensuring the stability of the connection of the liquid cooling plate 113 and ensuring the sealing effect between the liquid cooling plate 113 and the bottom beam 111.

[0082] The liquid cooling plate 113 has a liquid inlet 1131 and a liquid outlet 1132, as well as a liquid cooling channel 1134 connected to the liquid inlet 1131 and the liquid outlet 1132. The liquid inlet 1131 and the liquid outlet 1132 are used to connect to the liquid cooling pipeline in the prefabricated compartment, so as to achieve the cooling effect on the battery module 20 based on the circulating fluid in the liquid cooling channel 1134.

[0083] In some implementations, such as Figure 4 As shown, the lower box 11 also includes a bottom support beam 112, which is located in the area enclosed by the bottom beam 111, and both ends of the support beam 112 are fixedly connected to the bottom beam 111.

[0084] In this way, the battery module 20 is supported and fixed on the bottom beam 111 and the support beam 112, thereby improving the structural strength of the lower housing 11 and ensuring the reliability of the load-bearing capacity of the battery module 20.

[0085] In this configuration, in conjunction with the aforementioned bottom beam 111, the support beam 112 is located between a pair of side beams 116, and the two ends of the support beam 112 are respectively fixedly connected to a pair of side beams 116; in addition, the battery module 20 can be supported and fixed on the rear beam 115 and the support beam 112.

[0086] In addition to being fixedly connected to the bottom surface of the bottom beam 111, the liquid cooling plate 113 can also be fixedly connected to the support beam 112 to ensure the stability of the connection. At this time, due to the obstruction of the support beam 112, thermally conductive adhesive can be applied to the surface of the liquid cooling plate 113 facing the bottom beam 111 to ensure the heat transfer effect between the battery module 20 and the liquid cooling plate 113, thereby ensuring the heat dissipation effect of the battery module 20.

[0087] In some embodiments, the lower housing 11 also includes a baffle, which is fixedly connected to the bottom beam 111 and detachably connected to the cover 12 to form a battery housing 10 with a receiving cavity.

[0088] The enclosure may include a front end plate and a rear end plate disposed opposite to each other in the length direction X of the battery box 10; or a pair of side end plates disposed opposite to each other in the width direction Y of the battery box 10; or a front end plate and a rear end plate disposed opposite to each other in the length direction X of the battery box 10, and a pair of side end plates disposed opposite to each other in the width direction Y of the battery box 10.

[0089] In some embodiments, the lid 12 includes a top plate.

[0090] At this point, combined with the lower housing 11 described above, the enclosure includes a front end plate, a rear end plate, and a pair of side end plates. The edge of the top plate is fixedly connected to the front end plate, the rear end plate, and the pair of side end plates to form a battery housing 10 with a receiving cavity.

[0091] In other embodiments, the cover 12 includes a top plate, and a front plate and a rear plate disposed opposite to each other along the length direction X of the battery box 10, the front plate and the rear plate being fixedly connected to the top plate (e.g., by welding or as an integral structure).

[0092] At this time, in conjunction with the lower housing 11 described above, the enclosure includes a pair of side end plates arranged along the width direction Y of the battery housing 10, the front end plate and the rear end plate of the cover 12 are fixedly connected to the bottom beam 111 (front end beam 114 and rear end beam 115) of the lower housing 11, and the two sides of the top plate in the width direction Y of the battery housing 10 are fixedly connected to the pair of side plates included in the enclosure of the lower housing 11, so as to form a battery housing 10 with a receiving cavity.

[0093] In some other embodiments, the cover 12 includes a top plate, a front end plate and a rear end plate disposed opposite each other along the length direction X of the battery box 10, and a pair of side end plates disposed opposite each other along the width direction Y of the battery box 10. The front end plate, the rear end plate, and the pair of side end plates are all fixedly connected to the top plate (e.g., by welding or as an integral structure).

[0094] At this point, in conjunction with the lower housing 11 described above, the lower housing 11 only includes a bottom beam 111, a liquid cooling plate 113, and a support beam 112, and the front end plate, rear end plate, and a pair of side end plates of the housing 12 are detachably connected to the bottom beam 111 (front end beam 114, rear end beam 115, and a pair of side beams 116) of the lower housing 11 to form a battery housing 10 with a receiving cavity.

[0095] In some implementations, such as Figure 6 and Figure 7 As shown, the liquid cooling plate 113 has a liquid inlet 1131 and a liquid outlet 1132. The liquid inlet 1131 and the liquid outlet 1132 are located on the side of the liquid cooling plate 113 along the length direction X of the battery box 10, close to the front beam 114, and on the same side of the liquid cooling plate 113 along the width direction Y of the battery box 10.

[0096] Thus, by centrally setting the inlet 1131 and outlet 1132 on the liquid cooling plate 113, the battery box 10 containing the battery module 20 can be assembled in the prefabricated compartment (such as the battery cabinet). When connecting the liquid cooling pipe to the inlet 1131 and outlet 1132 of the liquid cooling plate 113, the path length of the liquid cooling pipe is shortened, especially the length of the suspended section of the liquid cooling pipe connected to the liquid cooling plate 113 is shortened, thereby avoiding local sagging of the liquid cooling pipe and ensuring the sealing reliability of the connection between the liquid cooling pipe and the inlet 1131 and outlet 1132 of the liquid cooling plate 113, thereby improving the assembly yield of the battery box 10 in the prefabricated compartment.

[0097] The liquid inlet 1131 and liquid outlet 1132 of the liquid cooling plate 113 can be located within the area enclosed by the bottom beam 111, that is, the liquid inlet 1131 and liquid outlet 1132 are located inside the receiving cavity of the battery box 10; or the liquid inlet 1131 and liquid outlet 1132 can be located outside the area enclosed by the bottom beam 111, that is, the liquid inlet 1131 and liquid outlet 1132 of the liquid cooling plate 113 are located outside the battery box 10.

[0098] When the liquid inlet 1131 and liquid outlet 1132 are located outside the battery housing 10, such as Figure 6 and Figure 7 As shown, the liquid cooling plate 113 has a protrusion 1133, which is located outside the receiving cavity. The liquid inlet 1131 and the liquid outlet 1132 are both located on the protrusion 1133.

[0099] Thus, by setting the liquid inlet 1131 and liquid outlet 1132 outside the battery housing 10, not only is the setting of the clearance hole on the lower housing 11 (such as the front beam 114) eliminated, reducing the design complexity of the lower housing 11 and ensuring the sealing effect of the lower housing 11, but it also enables the electro-hydraulic isolation between the battery module 20 and the liquid cooling plate 113. Even if the liquid inlet 1131 and liquid outlet 1132 of the liquid cooling plate 113 leak, it will not affect the charging and discharging of the battery module 20, thereby improving the safety of the charging and discharging of the battery module 20.

[0100] The liquid cooling plate 113 has liquid inlet 1131 and liquid outlet 1132 distributed at intervals along the width direction Y of the battery box 10, as shown in the figure. Figure 6 and Figure 7 As shown, the liquid inlet 1131 and liquid outlet 1132 of the liquid cooling plate 113 are distributed at intervals along the length direction X of the front beam 114, so as to reduce the size of the protrusion 1133 of the liquid cooling plate 113 extending out of the front beam 114 in the length direction X of the battery box 10, that is, to reduce the overall size of the battery box 10 in the length direction X, so as to reduce the interference of the protrusion 1133 with other structural components, thereby facilitating the assembly of the battery box 10 in the prefabricated compartment.

[0101] Alternatively, the liquid inlet 1131 and liquid outlet 1132 of the liquid cooling plate 113 are distributed at intervals along the length X of the battery box 10, that is, the liquid inlet 1131 and liquid outlet 1132 of the liquid cooling plate 113 are distributed at intervals along a direction perpendicular to the length X of the front beam 114, so as to further shorten the length of the suspended section of the liquid cooling pipe connected to the liquid cooling plate 113, thereby effectively avoiding local sagging of the liquid cooling pipe and ensuring the sealing reliability of the connection between the liquid cooling pipe and the liquid inlet 1131 and liquid outlet 1132 of the liquid cooling plate 113.

[0102] Of course, in addition to the liquid inlet 1131 and liquid outlet 1132 being distributed at intervals along the width direction Y of the battery box 10 or at intervals along the length direction X of the battery box 10 as described above, they can also be distributed at intervals in other directions. This application does not limit this.

[0103] Specifically, the protruding portion 1133 of the liquid cooling plate 113 can be a portion extending entirely beyond the front end beam 114 away from the rear end beam 115, or it can be as follows: Figure 6 and Figure 7 As shown, a portion of the liquid cooling plate 113 with an inlet 1131 and an outlet 1132 extends out of the front beam 114 and away from the rear beam 115.

[0104] When the liquid cooling plate 113 extends out of the front beam 114 away from the rear beam 115, it simplifies the structural design of the liquid cooling plate 113. When a local area of ​​the liquid cooling plate 113 extends out of the front beam 114 away from the rear beam 115, the protrusion 1133 on the liquid cooling plate 113 is located on the side of the battery box 10 along the width direction Y, which saves the material of the liquid cooling plate 113. At the same time, it realizes the foolproof assembly when the liquid cooling plate 113 is fixed to the bottom beam 111, and can also reduce the interference that occurs when the battery box 10 is assembled in the prefabrication compartment, and improve the assembly efficiency of the battery box 10.

[0105] In some implementations, such as Figure 8 and Figure 9 As shown, the energy storage device 100 includes multiple battery modules 20, and the multiple battery modules 20 are arranged at intervals along the width direction Y of the battery housing 10; the liquid cooling plate 113 has multiple liquid cooling channels 1134 distributed along the width direction Y of the battery housing 10, and the multiple liquid cooling channels 1134 correspond one-to-one with the multiple battery modules 20.

[0106] In this way, each liquid cooling channel 1134 can cool a corresponding battery module 20, thereby ensuring the cooling effect of the liquid cooling plate 113 on multiple battery modules 20.

[0107] In some implementations, such as Figure 8 As shown, the multi-section liquid cooling channel 1134 includes multiple liquid inlet channels 1135 and one liquid outlet channel 1136. The multiple liquid inlet channels 1135 are all connected to the liquid inlet 1131 and to the liquid outlet channel 1136. The liquid outlet channel 1136 is connected to the liquid outlet 1132.

[0108] In this way, by adjusting the number of inlet channels 1135 and outlet channels 1136 in the multi-segment liquid cooling channel 1134, it is easy to ensure the uniformity of cooling of multiple battery modules 20 by the multi-segment liquid cooling channel 1134, thereby ensuring the cooling effect of multiple battery modules 20.

[0109] For example, the energy storage device 100 includes four battery modules 20 distributed along the width direction Y of the battery housing 10. In this case, the multiple liquid cooling channels 1134 on the liquid cooling plate 113 include a liquid outlet channel 1136 corresponding to one battery module 20 and three liquid inlet channels 1135 corresponding to the other three battery modules 20.

[0110] In some implementations, such as Figure 8 As shown, in the width direction Y of the battery housing 10, the liquid inlet 1131 and the liquid outlet 1132 are located on the side of the liquid cooling plate 113 near the liquid outlet channel 1136.

[0111] Among them, such as Figure 8As shown, the multi-segment inlet channel 1135 includes a first inlet channel 11351 immediately adjacent to the outlet channel 1136, and at least one second inlet channel 11352 located on the side of the first inlet channel 11351 away from the outlet channel 1136. That is, the multi-segment inlet channel 1135 includes a first inlet channel 11351 closer to the inlet 1131, and at least one second inlet channel 11352 farther from the inlet 1131. At this time, as... Figure 8 As shown, a first sub-channel 11353 can be provided between the first liquid inlet channel 11351 and the liquid inlet 1131, and multiple second sub-channels 11354 can be provided between the second liquid inlet channel 11352 and the liquid inlet 1131.

[0112] Thus, for the second liquid inlet channel 11352 which is far from the liquid inlet 1131, the arrangement of multiple second sub-channels 11354 facilitates the increase of the channel area between the liquid inlet 1131 and the second liquid inlet channel 11352, thereby ensuring the uniformity of cooling of the corresponding battery module 20 by the first liquid inlet channel 11351 and the second liquid inlet channel 11352.

[0113] In some implementations, such as Figure 4 and Figure 5 As shown, a slider 117 is provided on the surface edge of the liquid cooling plate 113 facing away from the bottom beam 111, and multiple sliders 117 are distributed along the length direction X of the battery box 10.

[0114] Thus, when assembling the battery box 10 in the prefabricated compartment, the arrangement of multiple sliders 117 facilitates the reduction of the contact area between the battery box 10 and the battery bracket in the prefabricated compartment, thereby reducing the friction during assembly of the battery box 10 and facilitating its assembly. In addition, the individually arranged sliders 117 facilitate the replacement of the sliders 117 when wear or aging occurs.

[0115] The slider 117 can be directly fixed to the surface of the liquid cooling plate 113 facing away from the bottom beam 111, or the surface of the liquid cooling plate 113 facing away from the bottom beam 111 can have a corresponding limiting groove, and the slider 117 can be fixed in the corresponding limiting groove. This improves the determination of the fixed position of the slider 117 on the liquid cooling plate 113, and also achieves pre-fixation of the slider 117, improving the fixing efficiency of the slider 117. Alternatively, the slider 117 can be fixed separately to the liquid cooling plate 113, i.e., the slider 117 can be individually locked to the liquid cooling plate 113 by locking bolts. Of course, combined with the above-described fixing of the liquid cooling plate 113 and the bottom beam 111, the slider 117, the liquid cooling plate 113, and the bottom beam 111 can also be fixed simultaneously, i.e., as described above. Figure 5As shown, the slider 117, the liquid cooling plate 113 and the bottom beam 111 have coaxial second fixing holes 1111, so that the slider 117, the liquid cooling plate 113 and the bottom beam 111 can be synchronously fixed based on the fixing parts, so as to facilitate the installation of the slider 117 and reduce the use of parts.

[0116] The orthographic projection of slider 117 on the width direction Y of battery housing 10 can be semi-circular, semi-elliptical, or inverted trapezoidal, etc. That is, the dimension of slider 117 on the length direction X of battery housing 10 decreases along the direction away from liquid cooling plate 113, so as to further reduce the friction between slider 117 and battery bracket when battery housing 10 is assembled on battery bracket. When the orthographic projection of slider 117 is inverted trapezoidal, slider 117 has a support surface facing away from liquid cooling plate 113, and guide slopes connected to the support surface and located on both sides of the support surface along the length direction X of battery housing 10. The guide slopes and the support surface are connected by a rounded transition to ensure the stability of slider 117 supporting battery housing 10, while reducing wear on slider 117 and scratches on battery bracket.

[0117] The slider 117 can be made of metal or non-metal (such as rubber slider 117, resin slider 117, etc.). For non-metallic slider 117, the hard contact between slider 117 and battery holder can be reduced, thereby reducing the friction between slider 117 and battery holder and reducing scratches on battery holder.

[0118] In some implementations, such as Figure 9 and Figure 10 As shown, the energy storage device 100 includes multiple battery modules 20, and each pair of adjacent battery modules 20 is fixedly connected to a fixing plate 13.

[0119] In this way, the fixing plate 13 can be used to lock and bind multiple battery modules 20 inside the battery box 10, so that the force on the battery module 20 is distributed among the multiple battery modules 20, making the force on each battery module 20 more uniform. At the same time, the locking and binding of multiple battery modules 20 can improve the impact resistance of the energy storage device 100 and improve the stability of the battery modules 20 fixed inside the battery box 10.

[0120] Among them, two adjacent battery modules 20 can be two adjacent along the length direction X of the battery box 10 or two adjacent along the width direction Y of the battery box 10, so as to achieve locking and binding of all battery modules 20 in the battery box 10.

[0121] In conjunction with the battery module 20 described above, the fixing plate 13 can be fixed to the fixing end plate 22 included in the battery module 20. To simplify the fixing of the fixing plate 13 to the fixing end plate 22, it can be done as follows: Figure 3 As shown, the fixing plate 13 and the fixing end plate 22 have a coaxial first fixing hole 25. The fixing bolt 24 passes through the first fixing hole 25 on the fixing plate 13 and the fixing end plate 22 and is fixed at the bottom of the lower box 11 (i.e., fixedly connected to the bottom beam 111 or the support beam 112) so as to facilitate the fixed installation of the fixing plate 13 on the fixing end plate 22, while reducing the use of parts.

[0122] Among them, such as Figure 9 and Figure 10 As shown, multiple battery modules 20 have multiple gaps 26 formed in the width direction Y of the battery housing 10, so as to achieve heat dissipation effect of the battery modules 20 based on the gaps 26 between the battery modules 20.

[0123] When there are many battery modules 20 inside the battery box 10, such as Figure 9 and Figure 10 As shown, the multiple gaps 26 formed by the multiple battery modules 20 include edge gaps 28 adjacent to the side beam 116 and intermediate gaps 27 located between two edge gaps 28. The gap width of the intermediate gap 27 is greater than that of the edge gaps 28. Thus, the larger gap width of the intermediate gap 27 facilitates better heat dissipation between the two battery modules 20 forming the intermediate gap 27, thereby ensuring the overall heat dissipation effect of the multiple battery modules 20 within the battery housing 10.

[0124] Accordingly, the plurality of fixing plates 13 include a fixing plate 13 corresponding to the middle seam 27 and a fixing plate 13 corresponding to the edge seam 28. The size of the fixing plate 13 corresponding to the middle seam 27 is larger than the size of the fixing plate 13 corresponding to the edge seam 28, so as to ensure the locking and fixing of the plurality of battery modules 20.

[0125] This application also provides a power supply system 400, such as... Figure 11 As shown, the power supply system 400 includes: electrical equipment 410 and the energy storage device 100 described in the above embodiments, wherein the energy storage device 100 supplies power to the electrical equipment 410.

[0126] The electrical device 410 is electrically connected to the energy storage device 100. Thus, in conjunction with the above description, the power supply system 400 of this application ensures the reliability of the power supply from the energy storage device 100 to the electrical device 410 during use, thanks to the high assembly efficiency of the energy storage device 100.

[0127] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium; "fix" can be a non-detachable fixation or a detachable fixation (including non-destructive or destructive disassembly). Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0128] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0129] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the implementation of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0130] The above are merely preferred embodiments of the implementation methods of this application and are not intended to limit the implementation methods of this application. For those skilled in the art, various modifications and variations can be made to the implementation methods of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the implementation methods of this application should be included within the protection scope of the implementation methods of this application.

Claims

1. An energy storage device, characterized in that, include: The battery housing (10) includes a lower housing (11) and a housing cover (12), wherein the lower housing (11) and the housing cover (12) are closed and form a receiving cavity; The lower housing (11) includes a bottom beam (111) and a liquid cooling plate (113). The bottom beam (111) is annular and includes a front beam (114) and a rear beam (115) that are relatively distributed along the length direction (X) of the battery housing (10), and a pair of side beams (116) that are relatively distributed along the width direction (Y) of the battery housing (10). The liquid cooling plate (113) is fixedly connected to the bottom surface of the bottom beam (111). The liquid cooling plate (113) has a liquid inlet (1131) and a liquid outlet (1132). The liquid inlet (1131) and the liquid outlet (1132) are located on the side of the liquid cooling plate (113) along the length direction (X) of the battery housing (10) close to the front beam (114) and on the same side of the liquid cooling plate (113) along the width direction (Y) of the battery housing (10). The battery module (20) is housed in the receiving cavity and supported and fixed on the bottom beam (111).

2. The energy storage device (100) as described in claim 1, characterized in that, The liquid cooling plate (113) has a protrusion (1133) located outside the receiving cavity, and the liquid inlet (1131) and the liquid outlet (1132) are both located on the protrusion (1133).

3. The energy storage device as described in claim 2, characterized in that, The liquid inlet (1131) and the liquid outlet (1132) are distributed at intervals along the width direction (Y) or length direction (X) of the battery box (10).

4. The energy storage device as described in claim 2, characterized in that, The protrusion (1133) is located on one side of the battery housing (10) along the width direction (Y).

5. The energy storage device as described in claim 1, characterized in that, The energy storage device (100) includes a plurality of battery modules (20), and the plurality of battery modules (20) are arranged at intervals along the width direction (Y) of the battery housing (10); The liquid cooling plate (113) has multiple liquid cooling channels (1134) distributed along the width direction (Y) of the battery box (10). Each of the multiple liquid cooling channels (1134) corresponds to a plurality of battery modules (20). Each of the multiple liquid cooling channels (1134) includes multiple liquid inlet channels (1135) and a liquid outlet channel (1136). Each of the multiple liquid inlet channels (1135) is connected to the liquid inlet (1131) and to the liquid outlet channel (1136). The liquid outlet channel (1136) is connected to the liquid outlet (1132).

6. The energy storage device as described in claim 5, characterized in that, In the width direction (Y) of the battery housing (10), the liquid inlet (1131) and the liquid outlet (1132) are located on the side of the liquid cooling plate (113) near the liquid outlet channel (1136); The multiple inlet channels (1135) include a first inlet channel (11351) adjacent to the outlet channel (1136) and at least one second inlet channel (11352) located on the side of the first inlet channel (11351) away from the outlet channel (1136). The first inlet channel (11351) has a first sub-channel (11353) between it and the inlet (1131), and the second inlet channel (11352) has multiple second sub-channels (11354) between it and the inlet (1131).

7. The energy storage device as described in claim 1, characterized in that, The lower housing (11) includes a support beam (112), which is located between a pair of side beams (116), and the two ends of the support beam (112) are fixedly connected to the pair of side beams (116) respectively. The battery module (20) is supported and fixed on the bottom beam (111) and the support beam (112).

8. The energy storage device according to any one of claims 1-7, characterized in that, The energy storage device (100) includes a plurality of battery modules (20), and each pair of adjacent battery modules (20) is fixedly connected to a fixing plate (13).

9. The energy storage device as described in claim 8, characterized in that, The battery module (20) includes a fixing bolt (24) and a pair of oppositely arranged fixing end plates (22), and a plurality of battery cells (21) between the pair of fixing end plates (22); The fixing plate (13) and the fixing end plate (22) have coaxial fixing holes. The fixing bolt (24) passes through the first fixing hole (25) on the fixing plate (13) and the fixing end plate (22) and is fixed to the bottom of the lower box (11).

10. The energy storage device as described in claim 8, characterized in that, Multiple battery modules (20) have multiple gaps (26) formed in the width direction (Y) of the battery housing (10); The plurality of gaps (26) include an edge gap (28) adjacent to the side beam (116) and an intermediate gap (27) located between two edge gaps (28), the gap width of the intermediate gap (27) being greater than the gap width of the edge gaps (28).

11. The energy storage device according to any one of claims 1-7, characterized in that, The liquid cooling plate (113) has a slider (117) on its surface edge facing away from the bottom beam (111), and a plurality of the sliders (117) are distributed along the length direction (X) of the battery box (10).

12. The energy storage device as described in claim 11, characterized in that, The slider (117), the liquid cooling plate (113), and the bottom beam (111) have a coaxial second fixing hole (1111).

13. The energy storage device as described in claim 11, characterized in that, The orthographic projection of the slider (117) on the width direction (Y) of the battery box (10) is an inverted trapezoid, and the slider (117) is made of non-metallic material.

14. A power supply system, characterized in that, The power supply system (400) includes electrical equipment (410) and an energy storage device (100) as described in any one of claims 1-13, wherein the energy storage device (100) supplies power to the electrical equipment (410).

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