Battery box, energy storage device and power supply system

Abstract

The application discloses a battery box, an energy storage device and a power supply system, and relates to the technical field of energy storage. The battery box comprises a lower box body and a box cover, the box cover and the lower box body form a containing cavity, the lower box body comprises a front end beam, a rear end beam and a pair of side edge beams, the side edge beam comprises a body beam, a front sealing plate and a rear sealing plate, the body beam has a through cavity, the front end port edge of the body beam has a positioning gap, the front sealing plate has a fixing hole, the edge of the front sealing plate has a protrusion, the front sealing plate is fixed in the front end port, and the protrusion is limited in the positioning gap, and the rear sealing plate is fixed in the rear front end port on the body beam. In the application, the sealing plate arranged in the port of the cavity supports the body beam, guarantees the structural strength of the side edge beam, guarantees the reliability of the bearing, and further improves the safety of the energy storage device during carrying. In addition, through cooperation of the positioning gap and the protrusion, the front sealing plate is positioned in the front end port on the body beam, and the assembly efficiency of the front sealing plate is improved.

Description

Technical Field

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

[0002] Currently available battery packs consist of a battery housing and battery modules installed inside the housing. The battery housing typically includes a lower housing and a cover, with the cover fixedly connected to the lower housing to form a cavity for accommodating the battery modules.

[0003] The lower enclosure is primarily designed to support the weight of the battery modules. However, with the development of large-capacity battery packs, the total weight of the battery modules also increases accordingly, making it difficult for the existing lower enclosure to support the weight of the battery modules, thus increasing safety hazards during battery pack handling. Utility Model Content

[0004] A primary objective of this application is to provide a battery housing, energy storage device, and power supply system that can improve the structural strength of the lower housing and extend its service life.

[0005] To achieve the above-mentioned objectives, this application adopts the following technical solution:

[0006] According to one aspect of this application, a battery housing is provided, comprising: a lower housing and a housing cover, the housing cover being fixedly connected to the lower housing and forming a receiving cavity for placing a battery module; the lower housing includes a front beam, a rear beam, and a pair of side beams, the front beam and the rear beam being arranged parallel between the pair of side beams, and both ends of the front beam and both ends of the rear beam being fixedly connected to the side walls of the pair of side beams; the side beam includes a body beam, a front sealing plate, and a rear sealing plate, the body beam having a cavity extending through the length direction, the body beam having a positioning notch at the edge of the front port near the front beam, the edge of the front sealing plate having a protrusion, the front sealing plate being fixed within the front port, and the protrusion being limited within the positioning notch, and the rear sealing plate being fixed within the rear front port of the body beam near the rear beam.

[0007] In this embodiment, the sealing plate installed inside the cavity port supports the upper side arm of the main beam, ensuring the structural strength of the side beam, i.e., improving the load-bearing strength, ensuring the reliability of the load-bearing capacity of the battery module, and thus improving the safety of the energy storage device during transportation. In addition, the positioning notch and protrusion cooperate to achieve the positioning of the front sealing plate in the front port of the main beam, improving the assembly efficiency of the front sealing plate, and also enabling foolproof assembly of the front sealing plate in the front port of the main beam, thereby improving the assembly yield of the front sealing plate.

[0008] According to one embodiment of this application, the edge of the front port has two positioning notches, the two positioning notches having different dimensions in the circumferential direction of the edge of the front port, and the edge of the front sealing plate has two protrusions, the two protrusions being respectively limited within the two positioning notches.

[0009] In this embodiment, by setting two positioning notches of different sizes, the front sealing plate is assembled in the height and width directions of the battery box within the front port of the main beam to prevent mistaken assembly, while simplifying the structural design of the front sealing plate during mistaken assembly.

[0010] According to one embodiment of this application, the body beam includes a bottom wall plate and a top wall plate opposite each other in the height direction of the battery box; the bottom wall plate has the positioning notch at the edge of the front port and the top wall plate has the positioning notch at the edge of the front port; the front port of the body beam has a center line parallel to the height direction of the battery box; in the width direction of the battery box, the positioning notch of one of the bottom wall plate and the top wall plate is symmetrical along the center line, and the positioning notch of the other is asymmetrical along the center line.

[0011] In this embodiment, by setting two symmetrical positioning notches on the top and bottom walls, the front sealing plate can be anti-reversely assembled in the front port of the main beam, as well as foolproof assembly along the height and width directions of the battery box, while simplifying the structural design of the front sealing plate during foolproof assembly.

[0012] According to one embodiment of this application, the body beam includes an inner wall panel and an outer wall panel opposite to each other in the width direction of the battery box; the thickness of the inner wall panel is greater than the thickness of the outer wall panel, and the front end faces of the pair of body beams are mirror images of each other.

[0013] In this embodiment, for the inner and outer wall panels with different wall thicknesses on the main beam, the front end faces of a pair of main beams are set in a mirror image to achieve foolproof assembly of the front sealing plate inside the front end of the pair of main beams and improve the assembly efficiency of the sealing plate.

[0014] According to one embodiment of this application, the body beam includes a bottom wall plate and a top wall plate opposite to each other in the height direction of the battery box; the thickness of the bottom wall plate is greater than the thickness of the top wall plate, and the surface of the bottom wall plate facing away from the top wall plate has a sol-gel groove.

[0015] In this embodiment, the thickened bottom wall plate helps to ensure the depth of the sol-gel tank and improves the bonding effect between the bottom plate and the side beam.

[0016] According to one embodiment of this application, the surface edge of the front sealing plate facing away from the cavity and / or the inner edge of the front end face of the body beam are designed with a straight chamfer.

[0017] In this embodiment, by setting a straight chamfer on the surface edge of the front sealing plate and / or the inner edge of the front end face of the main body beam, the penetration depth of the front sealing plate when welding inside the front port of the main body beam can be increased, thereby improving the welding strength of the front sealing plate inside the front port. At the same time, it avoids the weld scar after welding from protruding from the front end face of the main body beam, which would affect the installation of the locking nut in the fixing hole on the front sealing plate.

[0018] According to one embodiment of this application, the edge of the front sealing plate has a notch, and the surface of the notch and the inner wall of the body beam form a drainage hole.

[0019] In this embodiment, by setting a notch on the front sealing plate, a drainage hole can be formed at the end of the side beam, which not only facilitates the drainage of electrophoretic liquid in the cavity, but also the drainage of condensate in the cavity, thereby improving safety.

[0020] According to one embodiment of this application, the front end beam has an upper flange and a lower flange facing away from the rear end beam; the thickness of the lower flange is greater than the thickness of the upper flange, and the surface of the lower flange facing away from the upper flange has a sol-gel groove.

[0021] In this embodiment, the upper and lower flanges enable the front beam to have a U-shaped structure, thereby increasing the structural strength of the front beam and ensuring the structural strength of the bottom beam after the front beam, rear beam, and side beams are fixed. In addition, the thickened lower flange further increases the structural strength of the front beam and also ensures the depth of the sol-gel tank, improving the bonding effect between the bottom plate and the front beam.

[0022] According to one embodiment of this application, the front sealing plate has fixing holes.

[0023] In this embodiment, a fixing hole is provided on the front sealing plate near the front beam to facilitate the locking and fixing of the battery box on the support frame, thereby simplifying the assembly of the battery box and ensuring the stability of the battery box.

[0024] According to one aspect of this application, an energy storage device is provided, including a battery module and a battery housing as described in the above aspect, wherein the battery module is housed within a receiving cavity of the battery housing.

[0025] 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.

[0026] 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

[0027] 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.

[0028] Figure 1 This is a schematic diagram of an energy storage system according to an exemplary embodiment.

[0029] Figure 2 This is an exploded structural diagram of an energy storage device according to an exemplary embodiment.

[0030] Figure 3 This is an exploded structural diagram of a battery box according to an exemplary embodiment.

[0031] Figure 4 This is an exploded structural diagram of a lower housing according to an exemplary embodiment.

[0032] Figure 5 yes Figure 3 The diagram shows an enlarged view of the battery housing in the area where the front cover is located.

[0033] Figure 6 yes Figure 4 The diagram shows an enlarged view of the lower housing in the area where the front sealing plate is located.

[0034] Figure 7 This is a schematic diagram of the axial structure of a side beam according to an exemplary embodiment.

[0035] Figure 8 yes Figure 7 The diagram shows an enlarged structural schematic of the side beam in the area where the front sealing plate is located.

[0036] Figure 9 This is a schematic diagram of a power supply system according to an exemplary embodiment.

[0037] The reference numerals in the attached figures are explained as follows:

[0038] 100. Energy storage devices; 200. Power conversion devices; 300. High-voltage cables; 400. Power supply systems; 410. Electrical equipment;

[0039] 10. Battery housing; 20. Battery module;

[0040] 11. Lower housing; 12. Housing cover; 13. Front beam; 14. Rear beam; 15. Side beam; 16. Support beam; 17. Base plate; 18. Solvent tank;

[0041] 121. Top plate; 122. Front panel; 123. Rear panel; 124. Side panel;

[0042] 131. Upward fold; 132. Downward fold;

[0043] 151. Main beam; 152. Front sealing plate; 153. Rear sealing plate;

[0044] 1511. Cavity; 1512. Positioning notch; 1513. Bottom wall panel; 1514. Top wall panel; 1515. Inner wall panel; 1516. Outer wall panel;

[0045] 1521. Fixing hole; 1522. Right chamfer; 1523. Protrusion; 1524. Notch;

[0046] 21. Fixed end plate; 22. Battery cell; 23. Bundling component. Detailed Implementation

[0047] 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.

[0048] Because the energy people need is highly time- and space-dependent, in order to make rational use of energy and improve its utilization rate, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future applications.

[0049] 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.

[0050] 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.

[0051] 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:

[0052] (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.

[0053] (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.

[0054] (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.

[0055] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application. Figure 1 And this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 100 of this application is not limited to its generation / distribution side energy storage scenario.

[0056] This application provides an energy storage system, which includes: an energy storage device 100, an energy conversion device 200, and a high-voltage cable 300.

[0057] In some embodiments of the power generation scenario, the power conversion device 200 may include 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 via grid connection. The energy storage device 100 is connected to the high-voltage cable 300 and outputs smooth electricity to the power consumption side of the distribution network, achieving peak shaving and frequency regulation, and ensuring stable grid operation. Alternatively, the wind power conversion device 200 is always connected to the high-voltage cable 300, and under normal power generation conditions, the wind power is converted through the high-voltage cable 300. The electrical energy output by the energy conversion device 200 is supplied to the power consumption side of the distribution network. 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 reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. 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 consumption side. This provides the power grid with various 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.

[0058] In some embodiments on the distribution network side, the power conversion device 200 may include a photovoltaic power conversion device 200, and an energy storage device 100 connected to the high-voltage cable 300 and installed downstream of the high-voltage cable 300 and between the user load. The electrical energy output by the photovoltaic power conversion device 200 is stored in the energy storage device 100, which can respond promptly and act as a backup power source when the power grid / distribution network fails; or, it can provide power supply support to alleviate line congestion when the high-voltage cable 300 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0059] Optionally, the power conversion device 200 may include, but is not limited to, a wind power conversion device 200, a photovoltaic power conversion device, etc. The power conversion device 200 is used to convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0060] Optionally, the energy storage device 100 may include, but is not limited to, energy storage application scenarios such as 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 may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0061] Optionally, the energy storage device 100 may include, but is not limited to, battery modules 20 composed of individual battery cells 22, battery packs, battery clusters, power banks, energy storage cabinets / containers, and other battery integrated systems. 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. This application embodiment only uses a multi-cell battery as an example for illustration.

[0062] Optionally, the energy storage device 100 may include battery cells 22, which may be, but are not limited to, at least one of cylindrical, prismatic, prismatic, or other shaped batteries. Battery cell 22 may be a rechargeable battery, meaning a battery cell 22 that can be recharged after discharge to activate its active materials and continue to be used. Battery cell 22 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.

[0063] In some implementations, such as Figure 2 As shown, the energy storage device 100 includes a battery housing 10 and a battery module 20, with the battery module 20 located inside the battery housing 10.

[0064] The battery housing 10 can accommodate 2, 4, 6, 8, or more battery modules 20. 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, the battery housing 10 may accommodate 4 battery modules 20, distributed along the width of the battery housing 10. Furthermore, the limiting methods for the multiple battery modules 20 within the battery housing 10 can be identical or not identical, as long as the fixed limiting of the multiple battery modules 20 can be achieved.

[0065] Among them, such as Figure 2As shown, the battery module 20 includes a pair of fixed end plates 21 disposed opposite to each other, and a plurality of battery cells 22 located between the pair of fixed end plates 21. The plurality of battery cells 22 and the pair of fixed end plates 21 can be fixed by binding members 23 such as cable ties. The fixed end plates 21 have mounting holes that extend through the height direction of the battery housing 10, so that the battery module 20 can be locked in the battery housing 10 by passing locking bolts through the mounting holes.

[0066] In addition, the energy storage device 100 also includes a sampling component and a battery management system. The sampling component corresponds one-to-one with the battery module 20 and is located on top of the corresponding battery module 20. The sampling component is electrically connected to the multiple battery cells 22 included in the corresponding battery module 20 and is electrically connected to the battery management system so as to monitor the charging and discharging parameters of the battery cells 22 included in each battery module 20 through the battery management system, thereby ensuring the safety of charging and discharging of the energy storage device 100.

[0067] The sampling component includes an isolation plate and a sampling circuit. The isolation plate covers multiple battery cells 22 of the corresponding battery module 20. The sampling circuit is located on the side of the isolation plate away from the battery cells 22 and is connected to the multiple battery cells 22 of the corresponding battery module 20, and is also electrically connected to the battery management system.

[0068] The isolation plate can be a plate-shaped structure made of insulating materials such as plastic sheet. The sampling circuit is confined on the isolation plate to achieve effective insulation between the sampling circuit and the battery cell 22.

[0069] In some implementations, such as Figure 2 or Figure 3 As shown, the battery box 10 includes a lower box 11 and a box cover 12. The box cover 12 is fixedly connected to the lower box 11 and forms a receiving cavity. The receiving cavity of the battery module 20 is located inside the receiving cavity of the battery box 10.

[0070] Among them, such as Figure 3 or Figure 4 As shown, the lower box body 11 includes a front beam 13, a rear beam 14 and a pair of side beams 15. The front beam 13 and the rear beam 14 are arranged in parallel between the pair of side beams 15, and both ends of the front beam 13 and both ends of the rear beam 14 are fixedly connected to the side walls of the pair of side beams 15 to form the bottom beam of the lower box body 11.

[0071] like Figure 4 As shown, the lower box body 11 also includes a support beam 16, which is located in the area enclosed by the front beam 13, the rear beam 14 and the side beams 15, and is fixedly connected to a pair of side beams 15.

[0072] Thus, the battery module 20 housed in the battery box 10 can be supported and fixed by the support beam 16, ensuring the stability of the battery module 20 within the battery box 10; at the same time, the bottom beam obtained by fixing the front beam 13, the rear beam 14 and the side beam 15 ensures the load-bearing strength of the lower box 11.

[0073] The end of the support beam 16 can be welded and fixed to the side wall of the side beam 15, and the lower box 11 can include one or more support beams 16. When the lower box 11 includes multiple support beams 16, the multiple support beams 16 are distributed at intervals along the length direction of the side beam 15 (i.e., the length direction of the battery box 10), and are all arranged parallel to the front beam 13 and the rear beam 14.

[0074] like Figure 3 or Figure 4 As shown, the lower housing 11 also includes a bottom plate 17, which is fixed to the bottom side of the front beam 13, the rear beam 14 and the side beam 15.

[0075] The base plate 17 can be fixedly connected to the front beam 13, the rear beam 14, and the side beam 15 by welding, bolting, or other means.

[0076] In addition, the base plate 17 can be fixed to the bottom surface of the front beam 13, the rear beam 14, and the side beam 15. At this time, the bottom surface of the front beam 13, the rear beam 14, and the side beam 15 can be provided with a sol-glue tank 18 so as to pre-fix the base plate 17 by the adhesive (such as thermally conductive adhesive) filled in the sol-glue tank 18, thereby improving the assembly efficiency. At the same time, based on the limit of the sol-glue tank 18 on the amount of adhesive it can hold, the overflow of adhesive from the bonding gap can be reduced or even avoided.

[0077] The base plate 17 includes at least a liquid cooling plate, and thermally conductive adhesive is used to fill the space between the battery module 20 and the liquid cooling plate to ensure efficient heat transfer between them, thereby ensuring effective heat dissipation for the battery module 20 and allowing it to charge and discharge at a suitable temperature. Furthermore, the liquid cooling plate included in the base plate 17 can extend beyond the front beam 13 to the side opposite to the rear beam 14, and the extended portion has an inlet and an outlet for liquid cooling channels. This allows for the installation of inlet and outlet pipes outside the battery housing 10, ensuring the sealing reliability of the battery housing 10 and achieving electro-hydraulic separation of the energy storage device 100, thus guaranteeing the electrical safety of the energy storage device 100.

[0078] In some implementations, such as Figure 3 As shown, the box cover 12 includes a top plate 121, and a front plate 122, a rear plate 123 and a pair of side plates 124 surrounding the edge of the top plate 121.

[0079] The front end plate 122 and the rear end plate 123 are fixedly connected to the front end beam 13 and the rear end beam 14, respectively, and a pair of side plates 124 are fixedly connected to a pair of side beams 15, respectively, to form a battery box 10 with a accommodating cavity.

[0080] In this embodiment, the load-bearing capacity of the battery module 20 is mainly achieved by the included bottom beam, so the included bottom beam will be explained in detail below.

[0081] In some implementations, such as Figure 5 As shown, the front beam 13 has an upper flange 131 and a lower flange 132 facing away from the rear beam 14.

[0082] Thus, by setting the upper flange 131 and the lower flange 132, the front beam 13 can be made into a U-shaped structure, thereby increasing the structural strength of the front beam 13. This ensures the structural strength of the bottom beam obtained after fixing the front beam 13, the rear beam 14, and the side beam 15, which in turn ensures the load-bearing strength of the lower housing 11. This, in turn, ensures the reliability of the load-bearing capacity of the battery module 20, thereby improving the safety of the energy storage device 100 during transportation. In addition, the setting of the upper flange 131 and the lower flange 132 can also protect the electrical components (such as high-voltage connectors, low-voltage connectors, etc.) mounted on the front beam 13, preventing the electrical components from being bumped or knocked.

[0083] Among them, the upper flange 131 on the front beam 13 is close to the box cover 12, and the lower flange 132 is close to the bottom plate 17. It can be fixedly connected to the box cover 12 through the upper flange 131 and to the bottom plate 17 through the lower flange 132.

[0084] In addition, the bonding and fixing of the base plate 17 and the bottom surface of the front beam 13 as described above can be as follows: Figure 6 As shown, the thickness d11 of the lower flange 132 is greater than the thickness d12 of the upper flange 131, and the surface of the lower flange 132 facing away from the upper flange 131 has a solvent groove 18. In this way, by thickening the lower flange 132, not only is the structural strength of the front beam 13 increased, but the depth of the solvent groove 18 is also guaranteed, thereby improving the bonding effect between the base plate 17 and the front beam 13.

[0085] In some implementations, such as Figure 4 and Figure 6 As shown, the side beam 15 includes a main beam 151, a front sealing plate 152 and a rear sealing plate 153. The main beam 151 has a cavity 1511 that runs through the length direction. The front sealing plate 152 is fixed on the main beam 151 near the front end of the front beam 13. The rear sealing plate 153 is fixed on the main beam 151 near the rear front end of the rear beam 14.

[0086] Thus, the sealing plate installed inside the port of cavity 1511 supports the upper arm of the main beam 151, ensuring the structural strength of the side beam 15, that is, improving the load-bearing strength, ensuring the reliability of the load-bearing capacity of the battery module 20, and thus improving the safety of the energy storage device 100 during transportation.

[0087] Optionally, such as Figure 6 As shown, the front cover plate 152 has fixing holes 1521. The fixing holes 1521 on the front cover plate 152 facilitate the locking and fixing of the battery box 10 on the support frame, thereby simplifying the assembly of the battery box 10 and ensuring the stability of the battery box 10.

[0088] The main beam 151 can be a square steel structure, and the ends of the main beam 151 can be rectangular, etc. Additionally, as... Figure 3 and Figure 6 As shown, the main beam 151 includes a bottom wall plate 1513, a top wall plate 1514, an inner wall plate 1515, and an outer wall plate 1516 surrounding the cavity 1511. The top wall plate 1514 is adjacent to the cover 12, and the bottom wall plate 1513 is adjacent to the bottom plate 17. The top wall plate 1514 is fixedly connected to the cover 12, and the bottom wall plate 1513 is fixedly connected to the bottom plate 17. The inner wall plate 1515 is close to the inner wall of the battery box 10, that is, adjacent to the battery module 20. The outer wall plate 1516 is close to the outer side of the battery box 10, that is, away from the battery module 20. The inner wall plate 1515 is fixedly connected to the front beam 13, the rear beam 14, and the support beam 16.

[0089] In some embodiments, the thickness of the bottom wall panel 1513 is greater than or equal to the thickness of the top wall panel 1514.

[0090] Thus, by thickening the bottom wall plate 1513, the structural strength of the main beam 151 can be increased, thereby increasing the structural strength of the side beam 15 and improving the reliability of the load-bearing capacity of the battery module 20.

[0091] For example, the thickness difference between the bottom wall panel 1513 and the top wall panel 1514 is less than or equal to 2 mm; for example, the thickness difference between the bottom wall panel 1513 and the top wall panel 1514 can be 0.5 mm, 0.8 mm, 1.2 mm, 1.6 mm, 2.0 mm, etc. For example, the thickness of the bottom wall panel 1513 is 2.5 mm, and the thickness of the top wall panel 1514 is 1.5 mm.

[0092] In addition, combined with the aforementioned bonding and fixing of the base plate 17 to the bottom surface of the side beam 15, it can be as follows: Figure 6 As shown, the bottom wall panel 1513 has a sol-gel groove 18 on the surface opposite to the top wall panel 1514. Thus, the thickened bottom wall panel 1513 facilitates ensuring the depth of the sol-gel groove 18 and improves the bonding effect between the bottom panel 17 and the side beam 15.

[0093] In some embodiments, the thickness of the inner wall panel 1515 is greater than or equal to the thickness of the outer wall panel 1516.

[0094] Thus, by thickening the inner wall panel 1515, the structural strength of the main beam 151 can be increased, thereby increasing the structural strength of the side beams 15 and improving the reliability of bearing the battery module 20. In addition, by combining the fixed connection between the rear beam 14, the support beam 16 and the inner wall panel 1515, the pulling of the rear beam 14 and the support beam 16 on the inner wall panel 1515 due to bearing the battery module 20 can be avoided, thus preventing the inner wall panel 1515 from deforming. This ensures the reliability of the lower housing 11 in bearing the battery module 20, and further ensures the safety of the energy storage device 100 during transportation.

[0095] For example, the thickness difference between the inner wall panel 1515 and the outer wall panel 1516 is less than or equal to 2 mm; for example, the thickness difference between the inner wall panel 1515 and the outer wall panel 1516 can be 0.5 mm, 0.8 mm, 1.2 mm, 1.6 mm, 2.0 mm, etc. For example, the thickness of the inner wall panel 1515 is 3.0 mm, and the thickness of the top wall panel 1514 is 2.0 mm.

[0096] In some embodiments, the surface edge of the front sealing plate 152 facing away from the cavity 1511, and / or the inner edge of the front end face (i.e., the annular end face near the front end beam 13) of the body beam 151 are designed with a right chamfer 1522. For example, as... Figure 7 and Figure 8 As shown, the surface edge of the front sealing plate 152 facing away from the cavity 1511 (not shown in the figure) is designed with a straight chamfer 1522.

[0097] Thus, by setting a chamfer 1522 on the surface edge of the front end plate 152 and / or the inner edge of the front end face of the main body beam 151, the penetration depth of the front end plate 152 when welding inside the front port of the main body beam 151 can be increased, thereby improving the welding strength of the front end plate 152 inside the front port. At the same time, it avoids the weld scar after welding from protruding from the front end face of the main body beam 151, which would affect the installation of the locking nut in the fixing hole 1521 on the front end plate 152.

[0098] Specifically, the surface edge of the front sealing plate 152 and / or the inner edge of the front end face of the body beam 151 can be designed with either a straight chamfer 1522 or a rounded chamfer. Compared to a rounded chamfer, a straight chamfer 1522 is easier to process and can more effectively increase the penetration depth during welding.

[0099] It should be noted that the chamfer design of the surface edge of the rear cover plate 153 facing away from the cavity 1511 and / or the inner edge of the rear end face (i.e., the annular end face near the rear end beam 14) on the body can refer to the design of the front cover plate 152 and the front end face to increase the welding strength of the rear cover plate 153 in the rear port of the body beam 151.

[0100] In some implementations, such as Figure 6 or Figure 8 As shown, the edge of the front sealing plate 152 has a notch 1524, and the surface of the notch 1524 and the inner wall of the body beam 151 form a drainage hole.

[0101] Thus, by setting the notch 1524 on the front sealing plate 152, a drain hole can be formed at the end of the side beam 15. On the one hand, during the stage of immersing the battery box 10 in electrophoretic solution to form an anti-corrosion coating, the electrophoretic solution that has seeped into the cavity 1511 can be drained along the drain hole to avoid the safety hazards caused by the electrophoretic solution accumulating in the cavity 1511 during the subsequent charging and discharging of the battery module 20. On the other hand, the condensate formed on the inner surface of the inner wall plate 1515 due to temperature difference during the charging and discharging of the energy storage device 100 can be drained along the drain hole to avoid the leakage of condensate along other gaps and the corrosion of the side beam 15, thereby improving safety.

[0102] The front cover 152 has a rectangular edge profile. This can be achieved by having a notch 1524 on the edge of the upper edge of the front cover 152, or by having a notch 1524 at the corner of the upper edge of the front cover 152. Furthermore, the edge of the front cover 152 can have one notch 1524 or multiple notches 1524. For example, Figure 6 It is shown that each of the four corners of the upper edge of the front cover plate 152 has a notch 1524.

[0103] In addition, besides the notch 1524 on the edge of the front sealing plate 152, the notch 1524 can also be on the edge of the rear sealing plate 153, or both the edges of the front sealing plate 152 and the rear sealing plate 153 can have notches 1524. This application does not limit the implementation of this method.

[0104] In some implementations, such as Figure 6 or Figure 8 As shown, the front end edge of the main beam 151 near the front end beam 13 has a positioning notch 1512, and the edge of the front sealing plate 152 has a protrusion 1523. The protrusion 1523 on the front sealing plate 152 is limited within the positioning notch 1512.

[0105] Thus, when the front sealing plate 152 is embedded and fixed, the positioning notch 1512 and the protrusion 1523 can be used to position the front sealing plate 152 in the front port of the main body beam 151, thereby improving the assembly efficiency of the front sealing plate 152. It can also increase the welding line length between the front sealing plate 152 and the main body beam 151, that is, increase the effective length of the weld scar, thereby ensuring the stability of the front sealing plate 152 fixed in the front port of the main body beam 151.

[0106] The edge of the front port of the main beam 151 may have a positioning notch 1512, and the edge of the front sealing plate 152 may have a protrusion 1523; or the edge of the front port of the main beam 151 may have multiple positioning notches 1512 (e.g., two positioning notches 1512), and the edge of the front sealing plate 152 may have multiple corresponding protrusions 1523 (e.g., two protrusions 1523), each protrusion 1523 being respectively limited within the corresponding positioning notch 1512.

[0107] In addition, the fixing of the rear end plate 153 on the main body beam 151 near the rear end beam 14 can be referenced to the fixing of the front end plate 152 in the front end. That is, the rear end edge of the main body beam 151 has a positioning notch 1512, and the edge of the rear end plate 153 has a protrusion 1523. Based on the cooperation between the protrusion 1523 and the positioning notch 1512, the assembly efficiency of the rear end plate 153 can be improved, and the stability of the rear end plate 153 fixed in the rear end of the main body beam 151 can be improved.

[0108] It should be noted that, in conjunction with the setting of the fixing hole 1521 on the front cover plate 152, the positioning notch 1512 on the front port edge of the main body beam 151 and the protrusion 1523 on the upper edge of the front cover plate 152 can be used to achieve foolproof assembly of the front cover plate 152 in the front port of the main body beam 151, avoid the front cover plate 152 being installed backwards, and improve the assembly yield of the front cover plate 152.

[0109] In conjunction with the above, when the edge of the front port of the main beam 151 has two positioning notches 1512, in order to achieve foolproof assembly of the front sealing plate 152 within the front port, as follows: Figure 6 As shown, the two positioning notches 1512 may have different circumferential dimensions at the front port edge to ensure that the two protrusions 1523 on the edge of the front cover plate 152 can only be positioned within their respective positioning notches 1512, thereby achieving foolproof assembly of the front cover plate 152 in the front port of the main beam 151 along the height direction H and width direction Y of the battery box 10, while simplifying the structural design of the front cover plate 152 during foolproof assembly.

[0110] For example, in the main beam 151, which includes a bottom wall plate 1513, a top wall plate 1514, an inner wall plate 1515, and an outer wall plate 1516, both the bottom wall plate 1513 and the top wall plate 1514 have positioning notches 1512 at their front ends. In this case, the two positioning notches 1512 have different dimensions in the width direction of the battery box 10. Alternatively, both the inner wall plate 1515 and the outer wall plate 1516 may have positioning notches 1512 at their front ends, in which case the two positioning notches 1512 have different dimensions in the height direction of the battery box 10.

[0111] Of course, besides the two positioning notches 1512 on the edge of the front port of the main beam 151 having different sizes, the two positioning notches 1512 on the edge of the front port can also be asymmetrically distributed, that is, the two positioning notches 1512 on the edge of the front port of the main beam 151 are neither linearly symmetrical nor rotationally symmetrical. For example, considering the bottom wall plate 1513, top wall plate 1514, inner wall plate 1515, and outer wall plate 1516 included in the main beam 151, both the edge of the bottom wall plate 1513 at the front port and the edge of the top wall plate 1514 at the front port have positioning notches 1512. In the width direction of the battery box 10, one of the bottom wall plate 1513 and the top wall plate 1514 has a positioning notch 1512 that is centrally located, while the other has a positioning notch 1512 that is eccentrically located. That is, the front end of the main beam 151 has a centerline parallel to the height direction of the battery box 10. The positioning notch 1512 of one of the bottom wall plate 1513 and the top wall plate 1514 is symmetrical along the centerline, while the positioning notch 1512 of the other is asymmetrical along the centerline. For example, as... Figure 6 As shown, the positioning notch 1512 on the top wall plate 1514 is symmetrical along the center line OO of the front port, while the positioning notch 1512 on the bottom wall plate 1513 is asymmetrical along the center line OO of the front port.

[0112] Thus, by setting the symmetry of the two positioning notches 1512 on the top wall plate 1514 and the bottom wall plate 1513, the front sealing plate 152 can be anti-reversely assembled in the front port of the main beam 151, and the foolproof assembly can be achieved along the height direction H and the width direction Y of the battery box 10, while simplifying the structural design of the front sealing plate 152 during foolproof assembly.

[0113] Furthermore, as described above, the inner wall plate 1515 and outer wall plate 1516 of the main beam 151 can have equal or unequal wall thicknesses. When the inner wall plate 1515 and outer wall plate 1516 have equal wall thicknesses, the fixing hole 1521 on the front sealing plate 152 is centrally located, thereby enabling the interchangeability of the front sealing plates 152 at the front ends of a pair of main beams 151.

[0114] Furthermore, in conjunction with the above description, when the front sealing plate 152 is fixed inside the front end of the main body beam 151, for the main body beam 151 included in the lower housing 11, in order to ensure the structural strength of the lower housing 11, so as to facilitate the lower housing 11 to bear the load of the battery module 20, and to fix the battery housing 10 on the support frame (i.e., the fixing of the front sealing plate 152 included in the battery housing 10 to the connection position (such as the connecting plate) on the support frame), in this application, the thickness of the inner wall plate 1515 on the main body beam 151 is set to be greater than the thickness of the outer wall plate 1516. At this time, in order to ensure that the fixing hole 1521 on the front sealing plate 152 included in the battery housing 10 is accurately aligned with the locking hole on the connection position on the support frame, the fixing hole 1521 on the front sealing plate 152 needs to be biased towards the inner wall plate 1515. However, if the fixing hole 1521 is biased towards the inner wall plate 1515, it will cause the front sealing plates 152 fixed in the front ports of the two main body beams 151 to have inconsistent structures, thereby reducing the assembly efficiency of the two front sealing plates 152 with different structures in the front ports of the two main body beams 151. Based on this, in order to facilitate the precise assembly of the two front sealing plates 152 with different structures in the front ports of their respective main body beams 151, the "cooperation of the positioning notch 1512 and the protrusion 1523" described above can be combined to achieve foolproof assembly of the two front sealing plates 152 with different structures in the front ports of the two main body beams 151, thereby improving the assembly efficiency and assembly yield of the side beams.

[0115] For example, the edge of the front port of the main body beam has two positioning notches, and the front port end faces of the pair of main body beams are mirrored. This allows for foolproof assembly of the front sealing plate within the front port of the pair of main body beams, improving the assembly efficiency of the sealing plate. The positions of the two positioning notches can be referred to the embodiments described above.

[0116] This application also provides a power supply system 400, such as... Figure 9 As shown, the power supply system 400 includes electrical equipment 410 and the energy storage device 100 described in the above embodiments. The energy storage device 100 is used to supply power to the electrical equipment 410.

[0117] 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 can ensure the stability of the power supply to the energy storage device 100 during use, thereby ensuring the stability of the electrical device 410.

[0118] 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0119] 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.

[0120] 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.

[0121] 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. A battery housing, characterized in that, include: The lower housing (11) and the housing cover (12) are fixedly connected to the lower housing (11) and form a receiving cavity, which is used to place the battery module (20). The lower box (11) includes a front beam (13), a rear beam (14) and a pair of side beams (15). The front beam (13) and the rear beam (14) are arranged in parallel between the pair of side beams (15), and both ends of the front beam (13) and both ends of the rear beam (14) are fixedly connected to the side walls of the pair of side beams (15). The side beam (15) includes a main beam (151), a front sealing plate (152), and a rear sealing plate (153). The main beam (151) has a cavity (1511) that runs through the length direction. The front port edge of the main beam (151) near the front end beam (13) has a positioning notch (1512). The edge of the front sealing plate (152) has a protrusion (1523). The front sealing plate (152) is fixed inside the front port, and the protrusion (1523) is limited within the positioning notch (1512). The rear sealing plate (153) is fixed inside the rear front port of the main beam (151) near the rear end beam (14).

2. The battery housing as described in claim 1, characterized in that, The edge of the front port has two positioning notches (1512), the two positioning notches (1512) have different dimensions in the circumferential direction of the edge of the front port, and the edge of the front cover plate (152) has two protrusions (1523), the two protrusions (1523) are respectively limited within the two positioning notches (1512).

3. The battery housing as described in claim 1, characterized in that, The main beam (151) includes a bottom wall plate (1513) and a top wall plate (1514) opposite each other in the height direction of the battery box (10); The bottom wall plate (1513) and the top wall plate (1514) both have positioning notches (1512) at the edge of the front port. The front port of the main beam (151) has a center line parallel to the height direction of the battery box (10). The positioning notch (1512) of one of the bottom wall plate (1513) and the top wall plate (1514) is symmetrical along the center line, while the positioning notch (1512) of the other is asymmetrical along the center line.

4. The battery housing as described in claim 2 or 3, characterized in that, The main beam (151) includes an inner wall panel (1515) and an outer wall panel (1516) opposite each other in the width direction of the battery box (10); The thickness of the inner wall panel (1515) is greater than the thickness of the outer wall panel (1516), and the front end faces of the pair of body beams (151) are mirror images of each other.

5. The battery housing as described in claim 1, characterized in that, The main beam (151) includes a bottom wall plate (1513) and a top wall plate (1514) opposite each other in the height direction of the battery box (10); The thickness of the bottom wall plate (1513) is greater than the thickness of the top wall plate (1514), and the surface of the bottom wall plate (1513) facing away from the top wall plate (1514) has a sol groove (18).

6. The battery housing as described in any one of claims 1-3, characterized in that, The surface edge of the front sealing plate (152) facing away from the cavity (1511) and / or the inner edge of the front end face of the body beam (151) are designed with a straight chamfer (1522).

7. The battery housing as described in any one of claims 1-3, characterized in that, The edge of the front sealing plate (152) has a notch (1524), the surface of which forms a drainage hole with the inner wall of the body beam (151).

8. The battery housing as described in any one of claims 1-3, characterized in that, The front beam (13) has an upper flange (131) and a lower flange (132) facing away from the rear beam (14); The thickness of the lower flange (132) is greater than the thickness of the upper flange (131), and the surface of the lower flange (132) facing away from the upper flange (131) has a sol groove (18).

9. The battery housing as described in any one of claims 1-3, characterized in that, The front sealing plate (152) has fixing holes (1521).

10. An energy storage device, characterized in that, Includes a battery module (20) and a battery housing (10) as described in any one of claims 1-9, wherein the battery module (20) is housed within the receiving cavity of the battery housing (10).

11. A power supply system, characterized in that, The power supply system (400) includes electrical equipment (410) and the energy storage device (100) as described in claim 10, wherein the energy storage device (100) supplies power to the electrical equipment (410).

Images