Battery box, battery pack and energy storage system

Abstract

The battery box, the battery pack and the energy storage system provided by the present disclosure relate to the technical field of energy storage. The battery box comprises a box cover and a lower box body. The lower box body has an open end. The box cover is arranged on the open end of the lower box body and forms a battery compartment together with the lower box body. The box cover comprises a top cover part and a side wall part connected to both sides of the top cover part along the width direction of the battery box. The included angles between the side wall parts on both sides and the top cover part are obtuse angles, which can improve the energy density of the battery pack.

Description

Technical Field

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

[0002] A battery pack typically includes multiple battery modules housed within its battery casing. As market demand for higher energy density and larger capacity battery packs continues to rise, there is a need to increase the energy density of battery packs.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this disclosure is to provide a battery enclosure, a battery pack, and an energy storage system.

[0005] According to one aspect of this disclosure, a battery housing is provided, the battery housing comprising:

[0006] The lower housing has an open end;

[0007] A cover is provided on the open end of the lower casing and surrounds the lower casing to form a battery compartment; the cover includes a top cover and side wall portions connected to both sides of the top cover along the width direction of the battery casing, and the included angle between the side wall portions and the top cover is an obtuse angle.

[0008] In one exemplary embodiment of this disclosure, the included angle between the sidewall portions on both sides and the top cover portion is the same.

[0009] In one exemplary embodiment of this disclosure, the included angle between the sidewall portion and the top cover portion is 92° to 100°.

[0010] In an exemplary embodiment of this disclosure, the lower housing includes a first side beam and a second side beam spaced apart along the width direction, and a third side beam and a fourth side beam spaced apart along the length direction of the battery housing. The two ends of the first side beam are connected to one end of the third side beam and the fourth side beam, and the two ends of the second side beam are connected to the other end of the third side beam and the fourth side beam.

[0011] In one exemplary embodiment of this disclosure, the battery housing further includes:

[0012] The liquid cooling plate is located on the side of the lower housing away from the housing cover along the height direction of the battery housing. The liquid cooling plate is bonded to the first side beam, the second side beam, the third side beam and the fourth side beam through an adhesive layer and fixedly connected by threaded parts.

[0013] In one exemplary embodiment of this disclosure, the top cover and the side wall are respectively provided with a plurality of connecting holes, and the box cover is fixedly connected to the lower box body by a plurality of threaded parts passing through the plurality of connecting holes one by one.

[0014] In one exemplary embodiment of this disclosure, the distribution density of the connecting holes on at least one side of the top cover near the sidewall is greater than the distribution density of the connecting holes away from the sidewall.

[0015] In one exemplary embodiment of this disclosure, a sealing layer is provided between the cover and the lower casing at the connection position along the width and height directions of the battery casing.

[0016] In one exemplary embodiment of this disclosure, the sealing layer is annular and surrounds the open end of the lower housing.

[0017] In one exemplary embodiment of this disclosure, the sealing layer is foam.

[0018] According to another aspect of this disclosure, a battery pack is also provided, the battery pack comprising:

[0019] The battery housing described in any of the above embodiments;

[0020] A battery module, which is located in the battery compartment of the battery housing.

[0021] According to another aspect of this disclosure, an energy storage system is also provided, which includes the battery pack described above.

[0022] The battery housing disclosed herein features two key features. First, the angles between the side walls and the top cover of the cover are all obtuse angles, meaning the cover gradually widens towards the opening. While ensuring the opening size allows for connection with the lower housing, this design allows for a relatively smaller top cover size, thus reducing the overall dimensions and volume of the battery pack, and consequently increasing its energy density. Second, by making the angles between the side walls and the top cover obtuse, i.e., the side walls are sloping, the battery pack requires guide rail support. To enhance the guide rail's support strength and prevent deformation during use, a triangular guide rail reinforcement is typically installed below the guide rail. The sloping side walls allow for avoidance of this reinforcement, preventing interference between the battery pack and the guide rail reinforcement when entering the mounting space of the cluster frame, thereby improving the ease of installation of the battery pack on the cluster frame. Third, since each battery cluster on the rack corresponds to a second-level branch of the liquid cooling pipeline, and each battery pack corresponds to a third-level branch of the liquid cooling pipeline, a T-junction is needed between the second and third-level branches. The sloping sidewalls can avoid the location of the T-junction, ensuring stable operation of the liquid cooling pipeline from the cluster level to the pack level. Fourth, during the assembly of the cover and lower casing, the height of the operating surface is usually lower than the operator's height. The sloping sidewalls reduce the operating precision, facilitate assembly operations, and speed up production efficiency. Fifth, the cover is easy to stack and handle during incoming materials, improving production efficiency. Sixth, the obtuse angles between the sidewalls and the top cover effectively reduce stress concentration at the connection between the sidewalls and the cover. When the battery pack is subjected to external mechanical forces, the obtuse angle structure makes the force transmission path smoother, avoiding excessive stress concentration in local areas, significantly reducing the risk of cover cracking, ensuring the integrity of the internal structure of the battery pack, and thus improving the safety of the battery pack.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 This is a schematic diagram of an energy storage system provided in one embodiment of the present disclosure.

[0026] Figure 2 This is a schematic diagram of a battery pack provided according to one embodiment of the present disclosure.

[0027] Figure 3 An exploded view of a battery pack provided for one embodiment of this disclosure.

[0028] Figure 4 This is a schematic diagram of a box lid provided for one embodiment of the present disclosure.

[0029] Figure 5 A side view of the lid along its length, provided for one embodiment of this disclosure.

[0030] Figure 6 This is a schematic diagram of a side beam provided for one embodiment of the present disclosure.

[0031] Figure 7 This is a schematic diagram showing the connection between the lid and the lower box body via threaded parts, according to one embodiment of the present disclosure.

[0032] Figure 8 This is a schematic diagram of a side beam and a liquid cooling plate provided for one embodiment of the present disclosure.

[0033] Figure 9 This is a schematic diagram of the side beam and liquid cooling plate from another perspective, provided for one embodiment of this disclosure.

[0034] Figure 10 An exploded view of the side beam and liquid cooling plate provided for one embodiment of this disclosure.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10. Energy storage device; 20. Power grid; 30. First power conversion device; 40. Second power conversion device;

[0037] 100. Battery pack; 110. Battery housing; 111. Lower housing; 1111. First side beam; 1112. Second side beam; 1113. Third side beam; 1114. Fourth side beam; 112. Housing cover; 1121. Top cover; 1122. Side wall; 113. Liquid cooling plate; 114. Sealing layer; 115. First panel; 116. Second panel; 120. Battery module; 121. Battery cell; 122. End plate. Detailed Implementation

[0038] 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 disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0039] 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.

[0040] Currently, green energy mainly includes solar energy and wind energy. However, solar energy and wind energy generally suffer from strong intermittency and large fluctuations, which can cause voltage instability in the green power grid (insufficient electricity during peak demand and excessive electricity during off-peak demand). Unstable voltage can damage the power grid, and therefore may lead to the problem of "curtailment of wind and solar power" due to insufficient electricity demand or insufficient grid capacity.

[0041] To solve the problem of insufficient electricity demand or inadequate grid capacity, we must rely on energy storage devices. These devices convert electrical energy into other forms of energy through physical or chemical means and store it. When needed, the stored energy is converted back into electrical energy and released. Simply put, an energy storage device is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing it when required.

[0042] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0043] (1) Large-scale energy storage power stations applied in power generation side energy storage scenarios such as wind power and photovoltaic power stations can assist renewable energy power generation to meet 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 renewable energy absorption capacity, reduce instantaneous power changes, reduce the impact on the power grid, improve the problem of new energy power generation absorption, and play a significant role in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0044] (2) Large energy storage containers used in grid-side energy storage scenarios mainly function as peak shaving, frequency regulation, and alleviating grid congestion. In terms of peak shaving, they can achieve 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, such as energy storage power station systems.

[0045] (3) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios are mainly used for self-consumption of electricity, peak shaving and valley filling, capacity cost management, and improving power supply reliability. Depending on the application scenario, energy storage on the electricity consumption side can be divided into commercial and industrial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Since there are large price differences in electricity prices at peak and valley times depending on electricity demand, users with energy storage devices usually charge the energy storage devices (energy storage cabinets / boxes) during periods of low electricity prices and release the electricity from the energy storage devices for use during periods of high electricity prices to save on electricity costs. In addition, communication base stations, data centers, and other fields need to be equipped with energy storage for backup power. Furthermore, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0046] Figure 1 This is a schematic diagram of an energy storage system provided in one embodiment of the present disclosure, and the present disclosure Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage system disclosed herein is not limited to the generation / distribution side energy storage scenario, but can also be applied to scenarios such as industrial and commercial side or user side.

[0047] like Figure 1 As shown, the energy storage system includes: an energy storage device 10, a power grid 20, a first power conversion device 30, and a second power conversion device 40. During power generation, the first power conversion device 30 and the second power conversion device 40 convert other forms of energy into electrical energy, which is then connected to the power grid 20 and supplied to the power consumption side of the distribution network. When the power load is low and the first power conversion device 30 and the second power conversion device 40 generate excess power, the excess electricity is stored in the energy storage device 10, reducing wind and solar curtailment rates and improving the absorption of new energy power generation. When the power load is high, the power grid issues an instruction to transmit the electricity stored in the energy storage device 10 in conjunction with the power grid 20 in a grid-connected mode to supply power to the power consumption side, providing the power grid 20 with various services such as peak shaving, frequency regulation, and backup, fully leveraging the peak shaving function of the power grid 20, promoting peak shaving and valley filling, and alleviating the power supply pressure on the power grid 20.

[0048] The first power conversion device 30 can be a solar energy conversion device, and the second power conversion device 40 can be a wind energy conversion device; of course, the power conversion device can also be a device that converts at least one of thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0049] Based on the above-mentioned energy storage methods using physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 10 includes at least one chemical battery. The chemical elements within the battery serve as the energy storage medium, and the charging and discharging process is achieved through the chemical reactions or changes in the storage medium. Simply put, it stores electrical energy generated from solar or wind power in at least one set of chemical batteries through the chemical reactions or changes in the storage medium. When external power consumption reaches its peak, the stored energy in at least one set of chemical batteries is released for use or transferred to areas with power shortages through the chemical reactions or changes in the storage medium.

[0050] The energy storage device 10 can be a battery pack, energy storage box, energy storage cabinet, etc., including individual battery cells. The individual battery cells can be lithium-ion secondary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the individual battery cells can be cylindrical, flat, cuboid, etc., and the embodiments disclosed herein are not limited in this respect.

[0051] like Figure 2 and Figure 3 As shown, taking the energy storage device 10 as an example of a battery pack 100, the battery pack 100 includes a battery housing 110 and multiple battery modules 120. The battery housing 110 includes a lower housing 111 and a housing cover 112, and the housing cover 112 is fixedly / detachably connected to the lower housing 111 to form a battery compartment; the multiple battery modules 120 are located inside the battery compartment.

[0052] The battery compartment of the battery housing 110 can hold at least one battery module 120, such as one, two, four, five, six, seven, eight, or more. The more battery modules 120 there are, the higher the capacity of the battery pack 100, thus making it easier to meet market demands. For example, such as... Figure 3 As shown, the battery compartment of the battery box 110 can accommodate a total of four battery modules 120, which are arranged in two rows along the length direction X of the battery box 110 and two columns along the width direction Y of the battery box 110.

[0053] Each battery module 120 may include a pair of end plates 122 arranged opposite each other along the cell arrangement direction, and a plurality of battery cells 121 located between the pair of end plates 122. The plurality of battery cells 121 and the pair of end plates 122 may be fixed by binding tools such as cable ties. The plurality of battery cells 121 are arranged along the length direction X of the battery box, and the plurality of battery cells 121 are connected by cell connecting pieces to realize series / parallel electrical connection between the plurality of battery cells 121.

[0054] In this configuration, multiple battery cells 121 are connected in series, with each cell connector connected to the electrode terminals of different polarities on two battery cells 121 respectively; or, multiple battery cells 121 are connected in parallel in pairs and then connected in series between the groups, with each cell connector first connected to the electrode terminals of the same polarity on two battery cells 121 respectively, and then connected to the electrode terminals of opposite polarity on two other battery cells 121.

[0055] Multiple battery packs 100 can be centrally mounted on a cluster rack. The cluster rack typically includes a cluster rack frame and guide rails. The cluster rack frame has multiple mounting spaces, and each mounting space is equipped with a guide rail connected to the cluster rack frame. The battery packs 100 can be slidably mounted on the cluster rack within the corresponding mounting space via the guide rails.

[0056] In one embodiment, such as Figures 2-5 As shown, the cover 112 includes a top cover portion 1121 and side wall portions 1122 connected to both sides of the top cover portion 1121 along the width direction Y of the battery box body 110, and the included angle between the side wall portions 1122 and the top cover portion 1121 is an obtuse angle.

[0057] The battery housing 110 provided in this disclosure has the following characteristics: First, the included angles between the side wall portions 1122 and the top cover portion 1121 on both sides of the housing cover 112 are all obtuse angles, that is, the housing cover 112 gradually expands in the direction of the opening. When the size of the opening of the housing cover 112 meets the requirements for connection with the lower housing 111, the size of the top of the housing cover 112 can be relatively reduced, thereby reducing the overall size of the battery pack 100, reducing the volume of the battery pack 100, and thus relatively increasing the energy density of the battery pack 100. Secondly, by making the included angles between the side walls 1122 on both sides of the cover 112 and the top cover 1121 both obtuse angles, that is, the side walls 1122 on both sides of the cover 112 are sloping walls; since the battery pack 100 needs to be supported by guide rails on the cluster frame, in order to improve the support strength of the guide rails and avoid deformation during use, triangular guide rail reinforcements are usually provided below the guide rails. The sloping side walls 1122 can avoid the guide rail reinforcements, thus avoiding interference between the battery pack 100 and the guide rail reinforcements when entering the installation space of the cluster frame, thereby improving the convenience of installing the battery pack 100 on the cluster frame. Third, since each battery cluster on the cluster rack corresponds to a second-level branch of the liquid cooling pipeline, and each battery pack 100 corresponds to a third-level branch of the liquid cooling pipeline, a T-junction is required between the second-level and third-level branches. The sloping side wall portion 1122 avoids the location of the T-junction, ensuring stable operation of the cluster-level liquid cooling pipeline to the pack-level liquid cooling pipeline. Fourth, during the assembly of the cover 112 and the lower housing 111, the height of the operating surface is usually lower than the height of the operator. The sloping side wall portion 1122 reduces the operating precision, facilitates assembly operations, and speeds up production efficiency. Fifth, during the incoming material production process, the cover 112 facilitates stacking and handling, improving production efficiency. Sixth, since the included angles between the side wall portions 1122 and the top cover portion 1121 are both obtuse angles, the stress concentration phenomenon at the connection position between the side wall portions 1122 and the cover portion can be effectively improved. When the battery box 110 is subjected to external mechanical force, the obtuse angle structure makes the force transmission path smoother, avoids excessive stress concentration in local areas, greatly reduces the risk of cracking of the cover 112, ensures the integrity of the internal structure of the battery pack 100, and thus improves the safety of the battery pack 100.

[0058] The included angles between the sidewall portions 1122 and the top cover portion 1121 on both sides can be the same. By making the included angles between the sidewall portions 1122 and the top cover portion 1121 on both sides the same, multiple box covers 112 can be stacked and handled during the production process without distinguishing between left and right directions. At the same time, during the assembly process of the box cover 112, the included angles between the sidewall portions 1122 and the top cover portion 1121 on both sides can make the box cover 112 a symmetrical structure. Operators do not need to distinguish between the left and right directions of the box cover 112 during the installation process, which reduces the assembly difficulty of the box cover 112, improves the assembly efficiency of the box cover 112, and also reduces product quality problems caused by incorrect assembly of the box cover 112. Of course, the included angles between the sidewall portions 1122 and the top cover portion 1121 on both sides can also be different, and this disclosure does not limit this.

[0059] Among them, such as Figure 5 As shown, the included angle ∠A between the side wall portion 1122 and the top cover portion 1121 can be 92° to 100°, such as 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99°, 100°, etc., which are not listed here. By making the included angle ∠A between the side wall portion 1122 and the top cover portion 1121 92° to 100°, the cover 112 can form a compact and reasonable battery compartment space when it is fitted with the lower casing 111, thereby improving the energy density of the battery pack 100 and reducing the volume of the battery pack 100, which facilitates installation on the battery rack. Of course, the included angle between the side wall portion 1122 and the top cover portion 1121 can also be less than 92° or greater than 100°, and this disclosure does not impose any restrictions on this.

[0060] In one embodiment, such as Figure 6 As shown, the lower housing 111 includes a first side beam 1111 and a second side beam 1112 spaced apart along the width direction Y, and a third side beam 1113 and a fourth side beam 1114 spaced apart along the length direction X of the battery housing 110. The two ends of the first side beam 1111 are connected to one end of the third side beam 1113 and the fourth side beam 1114, and the two ends of the second side beam 1112 are connected to the other ends of the third side beam 1113 and the fourth side beam 1114. The end-to-end connection of the side beams forms a rectangular frame structure, enhancing the structural strength and stability of the lower housing 111. The rectangular frame structure formed by the first side beam 1111, the second side beam 1112, the third side beam 1113, and the fourth side beam 1114 allows the battery housing 110 to be subjected to pressure, tension, or impact from different directions. This rectangular frame structure disperses these external forces to the side beams, preventing deformation or damage to the lower housing 111, better protecting the cells inside the battery pack 100, and improving the safety of the battery pack 100.

[0061] Among them, such as Figure 7As shown, the side wall portion 1122 of the cover 112 can be fixedly connected to the first side beam 1111 and the second side beam 1112 via threaded fittings. Connecting the side wall portion 1122 of the cover 112 to the first side beam 1111 and the second side beam 1112 via threaded fittings, for example, by providing a through hole in the side wall portion 1122 of the cover 112 and threaded holes in the first side beam 1111 and the second side beam 1112, and using bolts to fix the side wall portion 1122 of the cover 112 to the first side beam 1111 and the second side beam 1112, the tightening force can be adjusted by the screwing depth of the bolts in the threaded holes. This also facilitates the subsequent separation of the cover 112 from the lower casing 111, which is beneficial for the later maintenance of the battery pack 100.

[0062] Among them, such as Figure 7 As shown, the top cover 1121 and side wall 1122 of the cover 112 are respectively provided with multiple connecting holes. The cover 112 is fixedly connected to the lower housing 111 by multiple threaded fittings passing through the multiple connecting holes one by one. By providing multiple connecting holes on the top cover 1121 and side wall 1122 of the cover 112 and using threaded fittings, the cover 112 and the lower housing 111 can be tightly connected, ensuring the structural stability of the battery compartment. The combination of multiple connecting holes and multiple threaded fittings can evenly distribute the connection force, avoiding excessive local stress that could lead to loosening or damage to the connection.

[0063] The use of threaded fasteners facilitates the quick installation and removal of the cover 112 and the lower housing 111. Operators can quickly complete the assembly by passing the threaded fastener through the connecting hole and tightening it, thus improving production efficiency. When the battery pack 100 requires maintenance or repair, the cover 112 and the lower housing 111 can be quickly separated by removing the threaded fastener, facilitating inspection and repair of the internal components of the battery pack 100.

[0064] like Figure 3 As shown, the lower housing 111 also includes a first panel 115 and a second panel 116. The first panel 115 is connected to the third side beam 1113, and the second panel 116 is connected to the fourth side beam 1114. One end of the top cover portion 1121 of the housing cover 112 is connected to the top of the first panel 115 via a threaded connection in the longitudinal direction X, and the other end is connected to the top of the second panel 116 via a threaded connection. One end of the side wall portion 1122 is connected to the side of the first panel 115 via a threaded connection in the longitudinal direction X, and the other end is connected to the side of the second panel 116 via a threaded connection.

[0065] The sides of the first panel 115 and the second panel 116 that connect to the side wall 1122 are inclined surfaces. The inclined surfaces can be parallel to the side wall 1122 so that the side wall 1122 can fit better with the sides of the first panel 115 and the second panel 116 after the cover 112 is connected to the lower box 111, thus avoiding deformation of the cover 112 and improving the sealing of the battery compartment.

[0066] Among them, such as Figure 7 As shown, the density of connecting holes on at least one side of the top cover 1121 near the side wall 1122 is greater than the density of connecting holes further away from the side wall 1122. Since the stress on the cover 112 at the transition point between the top cover 1121 and the side wall 1122 is relatively high, stress concentration is likely to occur. Increasing the density of connecting holes at this transition point allows for the use of more threaded fasteners, thereby improving connection strength, effectively dispersing stress, reducing the risk of deformation or cracking in this area, improving the sealing of the top cover at corners, ensuring the waterproofness of the battery pack 100, and guaranteeing electrical safety. Since the stress is relatively low further away from this transition point, appropriately reducing the density of connecting holes, while maintaining connection strength, can reduce the number of threaded fasteners, improving the lightweight and economic efficiency of the battery pack 100. Furthermore, during long-term use of the battery pack 100, factors such as temperature changes and vibration may cause the threaded fasteners at the connection points to loosen. The number of threaded parts at the transition point between the top cover 1121 and the side wall 1122 can enhance the anti-loosening ability of the threaded parts, ensuring a tight connection between the cover 112 and the lower casing 111, thereby improving the safety and stability of the battery pack 100.

[0067] In the top cover 1121, the connection hole density can be relatively high in one of the two diagonal regions, while the connection hole density in the other diagonal region can be set normally with other regions. By making the connection hole density relatively high in only one diagonal region, the number of threaded parts can be reduced while ensuring connection strength, thus improving the lightweight and economy of the battery pack 100. Of course, the connection hole density in both diagonal regions can be set to be relatively high.

[0068] The side wall portion 1122 may also have a larger density of connecting holes on the side near the top cover portion 1121, thereby increasing the connection strength through a larger number of threaded parts.

[0069] In one embodiment, such as Figure 3As shown, a sealing layer 114 is provided between the cover 112 and the lower casing 111 at the connection point along the width direction Y and height direction Z of the battery casing 110. During the use of the battery pack 100, if external impurities enter the battery compartment, it can lead to problems such as cell corrosion and decreased insulation performance, seriously affecting battery performance and lifespan. By setting the sealing layer 114, a reliable sealing barrier can be formed between the cover 112 and the lower casing 111, ensuring the airtightness of the battery compartment and preventing external moisture, dust, and other impurities from entering the battery compartment, protecting the cells from the influence of the external environment. At the same time, the sealing layer 114 also prevents electrolyte leakage inside the battery compartment, avoiding safety accidents caused by electrolyte leakage and improving the safety of the battery pack 100.

[0070] Among them, such as Figure 3 As shown, the sealing layer 114 is annular and surrounds the open end of the lower housing 111. The annular sealing layer 114 provides omnidirectional sealing, avoiding any sealing blind spots. When the battery pack 100 is subjected to vibration or impact, the annular sealing layer 114 maintains a good seal and will not fail due to local deformation, ensuring that the battery pack 100 is always under sealed protection. During assembly, simply place the annular sealing layer 114 on the edge of the open end of the lower housing 111 and then close the cover 112 to complete the sealing assembly. This simple and quick operation reduces assembly difficulty and improves production efficiency. Furthermore, the annular structure of the sealing layer 114 is less prone to misalignment or twisting during installation, ensuring consistent sealing performance. In addition, the annular structure of the sealing layer 114 facilitates replacement and maintenance. When the sealing layer 114 ages or becomes damaged, simply remove the old annular sealing layer 114 and replace it with a new one, eliminating the need for complex adjustments to the entire sealing system and improving maintenance economy.

[0071] The sealing layer 114 can be made of foam. Foam has good elasticity and flexibility, allowing it to fit tightly against the connection surface between the cover 112 and the lower casing 111. Even if there are certain tolerances or surface unevenness during assembly, the foam can fill gaps through its elastic deformation, ensuring a good seal. During the use of the battery pack 100, factors such as temperature changes or vibrations may cause slight changes in the relative position between the cover 112 and the lower casing 111. The elasticity of the foam can adapt to these changes, maintaining good sealing performance and preventing seal failure. Furthermore, the foam also has a certain cushioning performance. When the battery casing 110 is subjected to external impact or vibration, the foam can absorb some energy, acting as a buffer between the cover 112 and the lower casing 111, reducing direct collision and friction between them.

[0072] In one embodiment, such as Figures 8-10As shown, the battery housing 110 also includes a liquid cooling plate 113. The liquid cooling plate 113 is located on the side of the lower housing 111 away from the cover 112 along the height direction Z of the battery housing 110. The liquid cooling plate 113 is bonded to the first side beam 1111, the second side beam 1112, the third side beam 1113, and the fourth side beam 1114 through an adhesive layer and fixedly connected by threaded parts. The liquid cooling plate 113 can serve as the bottom plate of the battery housing 110. Eliminating the need for a bottom plate reduces the weight of the battery pack 100, achieving weight reduction and thereby increasing the energy density of the battery pack 100. At the same time, it allows the battery module 120 to be directly placed on the liquid cooling plate 113, thereby avoiding the need for a bottom plate for heat conduction and improving the heat dissipation efficiency of the liquid cooling plate 113 for the battery module 120.

[0073] Furthermore, the liquid cooling plate 113 is connected to the first side beam 1111, the second side beam 1112, the third side beam 1113, and the fourth side beam 1114 using threaded connections. For example, through holes are provided on the liquid cooling plate 113, and threaded holes are provided on the first side beam 1111, the second side beam 1112, the third side beam 1113, and the fourth side beam 1114. When the liquid cooling plate 113 is fixed to the first side beam 1111, the second side beam 1112, the third side beam 1113, and the fourth side beam 1114 using bolts and threaded holes, the tightening force can be adjusted by the screw depth of the bolts in the threaded holes. This also facilitates the subsequent separation of the liquid cooling plate 113 from the lower housing 111. When the liquid cooling plate 113 malfunctions and needs repair or replacement, the liquid cooling plate 113 can be separated from the lower housing 111 simply by disassembling the threaded connections, which is beneficial for the later maintenance of the battery pack 100. By providing an adhesive layer between the liquid cooling plate 113 and the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 to bond them together, the gap between the liquid cooling plate 113 and the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 after being fixedly connected by threaded parts can be sealed, thereby improving the sealing performance of the battery compartment.

[0074] The adhesive layer between the liquid cooling plate 113 and the first side beam 1111, second side beam 1112, third side beam 1113, and fourth side beam 1114 can be a coated adhesive material or an attached adhesive material. The adhesive layer can be distributed in a ring shape on the first side beam 1111, second side beam 1112, third side beam 1113, and fourth side beam 1114. This ring-shaped adhesive layer can achieve omnidirectional sealing between the liquid cooling plate 113 and the first side beam 1111, second side beam 1112, third side beam 1113, and fourth side beam 1114, avoiding any sealing blind spots. When the battery pack 100 is subjected to vibration or impact, the ring-shaped adhesive layer can maintain a good sealing state and will not fail due to local deformation, ensuring that the battery pack 100 is always in a sealed and protected state.

[0075] In this disclosure, 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 expressly 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 this disclosure according to the specific circumstances.

[0076] In the description of the embodiments of this disclosure, 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 disclosure 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 disclosure.

[0077] In the description of this disclosure, 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 disclosure. 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.

[0078] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A battery housing, characterized in that, include: The lower housing has an open end; A cover is provided on the open end of the lower casing and surrounds the lower casing to form a battery compartment; the cover includes a top cover and side wall portions connected to both sides of the top cover along the width direction of the battery casing, and the included angle between the side wall portions and the top cover is an obtuse angle.

2. The battery housing according to claim 1, characterized in that, The included angles between the sidewall portions on both sides and the top cover portion are the same.

3. The battery housing according to claim 1, characterized in that, The angle between the side wall portion and the top cover portion is 92° to 100°.

4. The battery housing according to claim 1, characterized in that, The lower housing includes a first side beam and a second side beam spaced apart along the width direction, and a third side beam and a fourth side beam spaced apart along the length direction of the battery housing. The two ends of the first side beam are connected to one end of the third side beam and the fourth side beam, and the two ends of the second side beam are connected to the other end of the third side beam and the fourth side beam.

5. The battery housing according to claim 4, characterized in that, The battery housing also includes: The liquid cooling plate is located on the side of the lower housing away from the housing cover along the height direction of the battery housing. The liquid cooling plate is bonded to the first side beam, the second side beam, the third side beam and the fourth side beam through an adhesive layer and fixedly connected by threaded parts.

6. The battery housing according to claim 1, characterized in that, The top cover and the side wall are respectively provided with multiple connecting holes, and the box cover is fixedly connected to the lower box body by multiple threaded parts passing through the multiple connecting holes one by one.

7. The battery housing according to claim 6, characterized in that, The distribution density of the connecting holes on at least one side of the top cover near the side wall is greater than the distribution density of the connecting holes away from the side wall.

8. The battery housing according to claim 1, characterized in that, A sealing layer is provided between the cover and the lower casing at the connection point along the width and height directions of the battery casing.

9. The battery housing according to claim 8, characterized in that, The sealing layer is annular and surrounds the open end of the lower housing.

10. The battery housing according to claim 8, characterized in that, The sealing layer is foam.

11. A battery pack, characterized in that, include: The battery housing according to any one of claims 1 to 10; A battery module, which is located in the battery compartment of the battery housing.

12. An energy storage system, characterized in that, Includes the battery pack as described in claim 11.

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