Battery device, energy storage device, energy storage system and charging network

Abstract

The embodiment of the utility model provides a battery device, an energy storage device, an energy storage system and a charging network, and belongs to the technical field of battery devices. The battery device comprises: a first battery cell group comprising a plurality of first battery cells arranged along a first direction; the second battery monomer group comprises a plurality of second battery monomers which are arranged along the first direction; the separation beam is arranged between the first battery monomer group and the second battery monomer group; the first battery cell is provided with a first pressure relief mechanism, the second battery cell is provided with a second pressure relief mechanism, the separation beam is provided with a first collection cavity, and the first collection cavity is used for collecting emissions of the first battery cell when the first pressure relief mechanism is actuated and is used for collecting emissions of the second battery cell when the second pressure relief mechanism is actuated; and in the same projection plane perpendicular to the second direction, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are not overlapped, so that emissions released when the battery monomers are subjected to thermal runaway are prevented from being sprayed to the battery monomers on the opposite side.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a battery device, an energy storage device, an energy storage system, and a charging network. Background Art

[0002] With the rapid development of science and technology, electricity has become an indispensable energy source for people's production and daily life. To improve the smoothness of electricity supply and ensure the normal operation of production and life, energy storage devices are needed. Energy storage devices can realize the cyclic storage and release of electric energy. By charging or discharging the battery of the energy storage device, the electric energy can be stored in the energy storage device or supplied to the power-consuming device. Energy storage devices are widely used in industrial power supply, household power supply, temporary power supply, mobile power supply, wind power generation, solar power generation, and energy storage power stations.

[0003] In the development of energy storage devices, in addition to improving the endurance of energy storage devices, improving the reliability of battery devices is also an issue that cannot be ignored. Therefore, how to improve the reliability of battery devices is a technical issue that needs continuous improvement in energy storage technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device, an energy storage device, an energy storage system and a charging network to reduce the possibility of emissions released by a battery cell in thermal runaway being sprayed onto the opposite battery cell, thereby improving the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising:

[0006] A first battery cell group, comprising a plurality of first battery cells arranged along a first direction;

[0007] A second battery cell group, comprising a plurality of second battery cells arranged along the first direction, wherein the first battery cell group and the second battery cell group are arranged along a second direction, and the second direction intersects the first direction;

[0008] a separation beam, disposed between the first battery cell group and the second battery cell group;

[0009] A first pressure relief mechanism is provided on a side of the first battery cell facing the partition beam, and a second pressure relief mechanism is provided on a side of the second battery cell facing the partition beam. A first collecting chamber is provided inside the partition beam. The first collecting chamber is used to collect emissions from the first battery cell when the first pressure relief mechanism is actuated, and is used to collect emissions from the second battery cell when the second pressure relief mechanism is actuated.

[0010] In the same projection plane perpendicular to the second direction, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism do not overlap.

[0011] In the technical solution of the embodiment of the present application, because the orthographic projection of the first pressure relief mechanism on the projection plane does not overlap with the orthographic projection of the second pressure relief mechanism on the projection plane, the first pressure relief mechanism can be staggered with the second pressure relief mechanism. If a battery cell experiences thermal runaway, the emissions ejected from the pressure relief mechanism of the thermally runaway battery cell are unlikely to directly reach the pressure relief mechanism of the battery cell on the opposite side, thus preventing the thermal runaway from spreading to the battery cell on the opposite side and improving the reliability of the power battery device.

[0012] In an optional embodiment, the first battery cell has a first surface facing the separation beam, and the first pressure relief mechanism is eccentrically disposed on the first surface.

[0013] By eccentrically arranging the first pressure relief mechanism on the first surface facing the partition beam, the orthographic projection of the first pressure relief mechanism in the projection plane does not overlap with the orthographic projection of the second pressure relief mechanism in the projection plane, thereby achieving the staggered arrangement of the first pressure relief mechanism and the second pressure relief mechanism.

[0014] In an optional embodiment, the second battery cell has a second surface facing the separation beam, and the second pressure relief mechanism is eccentrically disposed on the second surface.

[0015] By eccentrically arranging the second pressure relief mechanism on the second surface facing the partition beam, the orthographic projection of the first pressure relief mechanism in the projection plane does not overlap with the orthographic projection of the second pressure relief mechanism in the projection plane, thereby achieving the staggered arrangement of the first pressure relief mechanism and the second pressure relief mechanism.

[0016] In an optional embodiment, the first battery cell and the second battery cell have the same structure;

[0017] Each of the first battery cells is arranged to be rotated 180 degrees relative to the second battery cell opposite to the first battery cell.

[0018] When the first battery cell and the second battery cell have the same structure, the first battery cell can be rotated 180 degrees relative to the second battery cell between the relatively arranged first battery cell and the second battery cell. This arrangement can achieve the staggered arrangement of the first pressure relief mechanism and the second pressure relief mechanism, and can also simplify the internal structure of the battery device.

[0019] In an optional embodiment, within the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a first direction; and / or, within the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a third direction;

[0020] The third direction and the second direction are perpendicular to the first direction.

[0021] By staggering the orthographic projection of the first pressure relief mechanism in the projection plane and the orthographic projection of the second pressure relief mechanism in the projection plane in the first direction and / or the third direction, the orthographic projection of the first pressure relief mechanism in the projection plane and the orthographic projection of the second pressure relief mechanism in the projection plane do not overlap.

[0022] In an optional embodiment, among two adjacent first battery cells, one of the first battery cells is rotated 180 degrees relative to the other first battery cell;

[0023] Among two adjacent second battery cells, one of the second battery cells is arranged to be rotated 180 degrees relative to the other second battery cell.

[0024] When the first and second battery cells have the same structure, provided that the first battery cell is rotated 180 degrees relative to the second battery cell, one of two adjacent first battery cells can be rotated 180 degrees relative to the other, and one of two adjacent second battery cells can be rotated 180 degrees relative to the other. This allows the exhaust from the pressure relief mechanism of a battery cell experiencing thermal runaway to be directly ejected onto the pressure relief mechanism of the battery cell opposite it, simplifying the internal structure of the battery device. In this case, the pressure relief mechanism of any battery cell will be offset from the pressure relief mechanism of its adjacent battery cell, and the pressure relief mechanism of any battery cell will be offset from the pressure relief mechanism of the battery cell opposite it.

[0025] In an optional embodiment, within the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a first direction; and / or, within the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a third direction;

[0026] The third direction and the second direction are perpendicular to the first direction.

[0027] When the structures of the first battery cell and the second battery cell are different, the orthographic projection of the first pressure relief mechanism in the projection plane and the orthographic projection of the second pressure relief mechanism in the projection plane are staggered in the first direction and / or the third direction so that the orthographic projection of the first pressure relief mechanism in the projection plane and the orthographic projection of the second pressure relief mechanism in the projection plane do not overlap.

[0028] In an optional embodiment, a first vent hole communicating with the first collecting chamber is provided on a side of the separation beam facing the first battery cell, and the first vent hole corresponds to a position of the first pressure relief mechanism;

[0029] A second vent hole communicating with the first collecting chamber is provided on a side of the separation beam facing the second battery cell, and the second vent hole corresponds to a position of the second pressure relief mechanism.

[0030] A first vent hole is provided on the side of the partition beam facing the first battery cell, so that when the first pressure relief mechanism is activated, the exhaust of the first battery cell can be directly discharged into the first collection chamber through the first vent hole. At the same time, a second vent hole is provided on the side of the partition beam facing the second battery cell, so that when the second pressure relief mechanism is activated, the exhaust of the second battery cell can be directly discharged into the first collection chamber through the second vent hole.

[0031] In an optional embodiment, within the projection plane, the orthographic projection of the first vent hole covers the orthographic projection of the first pressure relief mechanism.

[0032] By making the orthographic projection of the first vent hole in the projection plane cover the orthographic projection of the first pressure relief mechanism in the projection plane, on the one hand, the first pressure relief mechanism can be made unobstructed, which is conducive to the rapid opening of the first pressure relief mechanism, and avoids the first pressure relief mechanism being unable to open or unable to open completely due to being blocked by the partition beam when actuated, thereby avoiding the inability to exhaust or poor exhaust when the first battery cell has thermal runaway, and preventing the internal pressure of the first battery cell from being unable to be released quickly, causing the shell of the first battery cell to rupture or explode; on the other hand, it can also avoid the metal structure of the first pressure relief mechanism from contacting the shell and the partition beam of the first battery cell at the same time when the first pressure relief mechanism is actuated.

[0033] In an optional embodiment, the battery device further includes a first thermal insulation pad, which is disposed between the partition beam and the first battery cell group. The first thermal insulation pad is provided with a first avoidance hole, which is connected to the first vent hole.

[0034] A first thermal insulation pad is provided between the partition beam and the first battery cell group to prevent heat generated by the first battery cell in thermal runaway from being transferred to other battery cells via the partition beam, causing thermal diffusion. Heat discharged into the first collection chamber is also prevented from being transferred to other battery cells via the partition beam, causing thermal diffusion. A first avoidance hole is provided to prevent the first pressure relief mechanism from being blocked by the first thermal insulation pad when activated.

[0035] In an optional embodiment, within the projection plane, the orthographic projection of the first avoidance hole covers the orthographic projection of the first ventilation hole.

[0036] By making the orthographic projection of the first avoidance hole in the projection plane cover the orthographic projection of the first vent hole in the projection plane, the first pressure relief mechanism is facilitated to open quickly, thereby preventing the first pressure relief mechanism from being unable to open or unable to open completely due to being blocked by the first thermal insulation pad when actuated.

[0037] In an optional embodiment, within the projection plane, the orthographic projection of the second vent hole covers the orthographic projection of the second pressure relief mechanism.

[0038] By making the orthographic projection of the second vent hole in the projection plane cover the orthographic projection of the second pressure relief mechanism in the projection plane, on the one hand, the second pressure relief mechanism can be made unobstructed, which is conducive to the rapid opening of the second pressure relief mechanism, and avoids the second pressure relief mechanism being unable to open or unable to fully open due to being blocked by the partition beam when actuated, thereby avoiding the inability to exhaust or poor exhaust when the second battery cell has thermal runaway, and preventing the internal pressure of the second battery cell from being unable to be released quickly, causing the shell of the second battery cell to rupture or explode; on the other hand, it can also avoid the metal structure of the second pressure relief mechanism from contacting the shell and the partition beam of the second battery cell at the same time when the second pressure relief mechanism is actuated.

[0039] In an optional embodiment, the battery device further includes a second thermal insulation pad, which is disposed between the partition beam and the second battery cell group. The second thermal insulation pad is provided with a second avoidance hole, which is connected to the second vent hole.

[0040] A second thermal insulation pad is provided between the partition beam and the second battery cell group to prevent heat generated by the second battery cell in thermal runaway from being transferred to other battery cells via the partition beam, causing thermal diffusion. Heat discharged into the first collection chamber is also prevented from being transferred to other battery cells via the partition beam, causing thermal diffusion. A second avoidance hole is provided to prevent the second pressure relief mechanism from being blocked by the second thermal insulation pad when activated.

[0041] In an optional embodiment, within the projection plane, the orthographic projection of the second avoidance hole covers the orthographic projection of the second ventilation hole.

[0042] By making the orthographic projection of the second avoidance hole in the projection plane cover the orthographic projection of the second vent hole in the projection plane, the second pressure relief mechanism is facilitated to open quickly, thereby preventing the second pressure relief mechanism from being unable to open or unable to open completely due to being blocked by the second thermal insulation pad when actuated.

[0043] In an optional embodiment, the partition beam includes a beam body and a partition, the beam body is provided with the first collecting chamber, and the partition is provided in the first collecting chamber and divides the first collecting chamber into a first sub-chamber and a second sub-chamber that are not connected to each other;

[0044] The first sub-chamber is used to collect emissions from one of the first battery cell and the second battery cell opposite to each other along the second direction, and the second sub-chamber is used to collect emissions from the other of the first battery cell and the second battery cell opposite to each other along the second direction.

[0045] By arranging a partition in the first collecting chamber of the beam body, the first collecting chamber is divided into a first sub-chamber and a second sub-chamber that are not connected to each other through the partition. Since the first sub-chamber can collect emissions from one of the first battery cell and the second battery cell that are opposite to each other along the second direction, the second sub-chamber can collect emissions from the other of the first battery cell and the second battery cell that are opposite to each other along the second direction, the emissions from the first battery cell and the second battery cell that are opposite to each other along the second direction can be collected in different sub-chambers respectively, further avoiding the emissions sprayed out of the pressure relief mechanism of the battery cell in thermal runaway from being directly sprayed onto the pressure relief mechanism of the battery cell on the opposite side, thereby improving the reliability of the power battery device.

[0046] In an optional embodiment, the beam body has a first side plate, a second side plate, a third side plate, and a fourth side plate, the first side plate is close to the first battery cell, the second side plate is close to the second battery cell, the third side plate and the fourth side plate are arranged opposite to each other along a third direction, and the third side plate and the fourth side plate are respectively connected between the first side plate and the second side plate; the third direction and the second direction are perpendicular to the first direction in pairs;

[0047] The partition is connected between the first side panel and the second side panel;

[0048] The first sub-cavity is formed between the first side plate, the second side plate, the third side plate and the partition, and the second sub-cavity is formed between the first side plate, the second side plate, the fourth side plate and the partition.

[0049] The first collecting chamber is surrounded by the first side plate, the second side plate, the third side plate and the fourth side plate. By connecting the partition between the first side plate and the second side plate, the first collecting chamber of the beam body is divided into two, forming a first sub-chamber and a second sub-chamber, thereby providing collection space for the emissions of the first battery cell and the second battery cell respectively.

[0050] In an optional embodiment, the beam body and the partition are integrally formed.

[0051] The separator is configured as a structure integrally formed with the beam body to improve the integration of the separator beam and simplify the structure of the battery device.

[0052] In an optional embodiment, the battery device further includes a box, the box including a first end plate and a second end plate, the first end plate and the second end plate are spaced apart along the first direction, the first battery cell group and the second battery cell group are disposed between the first end plate and the second end plate, and the partition beam is connected between the first end plate and the second end plate;

[0053] A second collecting chamber is provided in the first end plate, and a third collecting chamber is provided in the second end plate;

[0054] The first sub-chamber is communicated with the second collecting chamber, and the second sub-chamber is communicated with the third collecting chamber.

[0055] By allowing the emissions from the first battery cell to enter the second collection chamber through the first sub-chamber, and the emissions from the second battery cell to enter the third collection chamber through the second sub-chamber, the two battery cell groups have independent emission channels, so that the emissions from the battery cell in thermal runaway cannot affect the battery cells on the opposite side.

[0056] In an optional embodiment, the box body further includes a bottom plate, the bottom plate supports the first battery cell group and the second battery cell group, and the partition beam, the first end plate and the second end plate are all connected to the bottom plate.

[0057] The bottom plate is provided to realize the installation of the partition beam, the first end plate and the second end plate.

[0058] In an optional embodiment, the first end plate is further provided with a third vent hole communicating with the second collecting chamber, and the first sub-chamber is communicated with the third vent hole;

[0059] The second end plate is further provided with a fourth vent hole communicating with the third collecting chamber, and the second sub-chamber is communicated with the fourth vent hole.

[0060] By providing a third vent hole on the first end plate, the first sub-cavity can communicate with the second collection cavity through the third vent hole, allowing the exhaust from the first battery cell to enter the second collection cavity through the first sub-cavity and the third vent hole. By providing a fourth vent hole on the second end plate, the second sub-cavity can communicate with the third collection cavity through the fourth vent hole, allowing the exhaust from the second battery cell to enter the third collection cavity through the second sub-cavity and the fourth vent hole.

[0061] In a second aspect, the present application provides an energy storage device, which includes the battery device in the above embodiment.

[0062] The energy storage device provided in the present application includes the battery device described in any one of the embodiments of the first aspect, and thus has the technical effects described in any one of the above embodiments, which will not be described in detail here.

[0063] In a third aspect, the present application provides an energy storage system, which includes an energy storage converter and the energy storage device in the above embodiment, wherein the energy storage converter is used to electrically connect a power generation device and the energy storage device.

[0064] The energy storage system provided in the present application includes the energy storage device described in any one of the embodiments of the second aspect, and thus has the technical effects described in any one of the above embodiments, which will not be described in detail here.

[0065] In a fourth aspect, the present application provides a charging network, which includes a charging pile and the energy storage device in the above embodiment, and the energy storage device is used to provide electrical energy to the charging pile.

[0066] According to the charging network provided in the present application, since it includes the energy storage device described in any one of the embodiments of the second aspect, it has the technical effects described in any one of the above embodiments, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0068] Figure 1 This is a schematic diagram of the structure of a charging network in some embodiments of the present application;

[0069] Figure 2 A schematic diagram of the structure of an energy storage system in some embodiments of the present application;

[0070] Figure 3 Schematic diagram of the structure of the energy storage device in some embodiments of the present application;

[0071] Figure 4 Schematic diagram of the exploded structure of a battery device in some embodiments of the present application;

[0072] Figure 5 is a schematic structural diagram of another battery device in some embodiments of the present application;

[0073] Figure 6 This is a schematic diagram of the exploded structure of a first battery cell in some embodiments of the present application;

[0074] Figure 7 for Figure 5 Schematic diagram of the decomposition structure;

[0075] Figure 8 for Figure 5 Cross-sectional view at AA in the middle;

[0076] Figure 9 for Figure 8 A magnified schematic diagram of point A in the middle;

[0077] Figure 10 for Figure 7 Schematic diagram of the assembly of the first end plate, the second end plate and the bottom plate;

[0078] Figure 11 for Figure 10 Assembly diagram from another angle;

[0079] Figure 12 for Figure 7 Schematic diagram of the assembly of the partition beam, the first end plate, the second end plate and the bottom plate;

[0080] Figure 13 for Figure 12 Cross-sectional view at the middle BB;

[0081] Figure 14 for Figure 13 A magnified schematic diagram of point B in the middle;

[0082] Figure 15 for Figure 13 The enlarged schematic diagram of point C in the middle;

[0083] Figure 16 for Figure 7 A schematic structural diagram of the first battery cell group in FIG.

[0084] Figure 17 for Figure 7 A schematic structural diagram of the second battery cell group in FIG;

[0085] Figure 18 for Figure 7 Schematic diagram of the structure of the partition beam in FIG;

[0086] Figure 19 for Figure 18 A structural diagram from another angle;

[0087] Figure 20 This is a schematic structural diagram of a first battery cell group of yet another battery device in some embodiments of the present application;

[0088] Figure 21 This is a schematic structural diagram of a second battery cell group of yet another battery device in some embodiments of the present application;

[0089] Figure 22 This is a schematic structural diagram of a partition beam of another battery device in some embodiments of the present application;

[0090] Figure 23 for Figure 22 A structural diagram from another angle.

[0091] The accompanying drawings in the specific implementation manner are as follows:

[0092] 1000, charging network; 2000, energy storage system; 3000, power generation device;

[0093] 100. Battery device;

[0094] 10. Box; 11. First part; 12. Second part; 13. First end plate; 131. Second collection chamber; 132. Third vent; 14. Second end plate; 141. Third collection chamber; 142. Fourth vent; 15. Bottom plate; 16. Third insulation pad; 17. Fourth insulation pad; 18. Fifth insulation pad; 19. Sixth insulation pad;

[0095] 20. First battery cell group; 21. First battery cell; 21a. First surface; 211. Outer shell; 2111. End cap; 2112. Housing; 212. Cell assembly; 213. Post; 214. First pressure relief mechanism;

[0096] 30. Second battery cell group; 31. Second battery cell; 31a. Second surface; 311. Second pressure relief mechanism;

[0097] 40. Separating beam; 40a. First collecting chamber; 401. First sub-chamber; 402. Second sub-chamber; 403. First vent; 404. Second vent; 41. Beam body; 411. First side panel; 412. Second side panel; 413. Third side panel; 414. Fourth side panel; 42. Separator;

[0098] 50. First thermal insulation pad; 51. First avoidance hole;

[0099] 60. Second thermal insulation pad; 61. Second avoidance hole;

[0100] 200. Energy storage device; 210. Energy storage box;

[0101] 300, charging pile;

[0102] 400. Energy storage and current conversion device;

[0103] x, first direction; y, second direction; z, third direction. DETAILED DESCRIPTION

[0104] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0105] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0106] In the description of the embodiments of this application, technical terms such as "first" and "second" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly indicate the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this application, "multiple" means two or more (including two), "multiple groups" means two or more (including two), and "multiple pieces" means two or more (including two).

[0107] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0108] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies to provide voltage and capacity.

[0109] In some embodiments, a battery cell group is typically formed by arranging multiple battery cells, which are connected in series, parallel, or parallel via a busbar. For example, a battery cell group may be a battery module, which is composed of multiple battery cells arranged and fixed together to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0110] In a battery device with two rows of battery cells, the battery cells in the same row constitute a battery cell group. To improve the safety of the battery device, a metal partition beam with an exhaust channel is usually provided between the two battery cell groups. The two battery cell groups are distributed on both sides of the partition beam, and a pressure relief mechanism is provided at the center of the side of each battery cell close to the partition beam. That is, the pressure relief mechanisms of the two rows of battery cells are located face to face on both sides of the partition beam, and the two rows of battery cells share the same exhaust channel.

[0111] At the same time, a layer of epoxy board or mica sheet serves as a thermal insulation plate between each battery cell group and the separator beam. The thermal insulation plate is designed with a plurality of first-level dense holes (each of which is smaller than the size of the pressure relief mechanism) at the position directly opposite each pressure relief mechanism. The separator beam is designed with a plurality of second-level dense holes (each of which is smaller than the size of the pressure relief mechanism) at the position directly opposite each pressure relief mechanism. When a battery cell experiences thermal runaway, emissions (such as high-temperature, high-pressure gas, liquid, and metallic solids) can be ejected from the pressure relief mechanism, then enter the exhaust duct through the first-level and second-level dense holes, and finally discharged to the outside of the battery device through the hollow channel of the end plate.

[0112] However, since the pressure relief mechanisms of the two rows of battery cells are located face to face on both sides of the partition beam, and the two rows of battery cells share the same exhaust channel, the exhaust positions of the battery cells on both sides are spatially interconnected. When thermal runaway occurs in the battery cells on one side, the released gas emissions will be sprayed from the second dense small holes of the partition beam to the battery cells on the opposite side, which can easily cause damage to the pressure relief mechanism of the battery cells on the opposite side or even the thermal runaway spray valve, causing the thermal runaway to spread. The emissions of liquid and metal solid substances will make the outer shell of the battery cell electrically conductive with the partition beam. When the thermal runaway battery cell and the battery cell on the opposite side are connected to the partition beam at the same time, a short circuit accident of the battery device will occur.

[0113] In addition, there is only one layer of insulation board between the battery cell group and the partition beam, which makes the distance between the battery cell and the partition beam relatively close. After the battery cell thermal runaway, the outer shell expands, causing the outer shell to contact the partition beam or making the distance between the outer shell and the partition beam closer. The closer distance will cause the pressure relief mechanism to be unable to open or unable to open completely, resulting in the inability to exhaust or poor exhaust. The internal pressure of the battery cell cannot be released quickly, which will cause the outer shell of the battery cell to rupture or explode.

[0114] In the same battery cell group, the space between the pressure relief mechanism and the partition beam of each battery cell is connected. When one of the battery cells in the same battery cell group experiences thermal runaway and a valve spray occurs, since the size of the second dense small holes is smaller than the size of the pressure relief mechanism, the sprayed emissions will be blocked by the adjacent second dense small holes, causing part of the emissions to enter the area where the adjacent battery cell is located, which can easily cause the thermal runaway to spread, or cause a short circuit between the outer shell of the adjacent battery cell and the partition beam.

[0115] In order to reduce the possibility of emissions released by battery cells when thermal runaway occurs and being sprayed onto the battery cells on the opposite side, research has found that the pressure relief mechanism can be biased towards the side of the battery cell close to the partition beam, so that the pressure relief mechanism of each battery cell is staggered with the pressure relief mechanism of the battery cell on the opposite side. In this way, after thermal runaway occurs in the battery cell, the emissions ejected from the pressure relief mechanism cannot be directly sprayed onto the pressure relief mechanism of the battery cell on the opposite side, thereby avoiding the thermal runaway from spreading to the battery cell on the opposite side, thereby improving the reliability of the power battery device.

[0116] Based on the above considerations, and to address the issue of emissions from battery cells experiencing thermal runaway potentially spraying onto the opposite battery cell, a battery device has been designed in which, within the same projection plane perpendicular to the second direction, the orthographic projection of the first pressure relief mechanism of the first battery cell and the orthographic projection of the second pressure relief mechanism of the second battery cell do not overlap, thereby enabling the first and second pressure relief mechanisms to be staggered. If a battery cell experiences thermal runaway, emissions from the pressure relief mechanism of the affected battery cell are unlikely to be directly sprayed onto the pressure relief mechanism of the opposite battery cell, preventing the thermal runaway from spreading to the opposite battery cell and thereby improving the reliability of the power battery device.

[0117] The battery device disclosed in the embodiments of the present application can be applied to energy storage devices such as energy storage containers or energy storage cabinets.

[0118] The battery device 100 is described below with reference to the accompanying drawings.

[0119] Please refer to Figure 1 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in some embodiments of the present application. Figure 3 A schematic diagram of the structure of an energy storage device 200 provided in some embodiments of the present application. Embodiments of the present application provide a charging network 1000, which includes charging piles 300, which are used to charge electrical devices. Charging network 1000 may also include an energy storage device 200, which is electrically connected to charging piles 300 and is used to provide electrical energy to charging piles 300.

[0120] It should be noted that the charging pile 300 is electrically connected to the battery cells in the energy storage device 200 via a cable, and the battery cells can provide their stored energy to the charging pile 300. The charging pile 300 has a connector that can be connected to an electrical device to replenish energy. The application of the energy storage device 200 in the charging network 1000 can effectively improve the safety of the charging network 1000 and also help increase the flexibility of the charging network 1000 during deployment.

[0121] In a charging network 1000 , there may be one charging pile 300 , and the energy storage device 200 provides power to the one charging pile 300 ; there may also be multiple charging piles 300 , and the energy storage device 200 provides power to multiple charging piles 300 .

[0122] As an example, Figure 1 As shown, the charging network 1000 includes an energy storage device 200 and two charging piles 300 , and one energy storage device 200 provides power to the two charging piles 300 .

[0123] The energy storage device 200 may include a battery device 100 , which is electrically connected to the charging pile 300 so that the battery device 100 provides electrical energy to the charging pile 300 .

[0124] Please refer to Figure 2 and Figure 3 , Figure 2 A schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of the present application. Embodiments of the present application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, which can be electrically connected to a power generation device 3000 to convert the electric power provided by the power generation device 3000. The energy storage system 2000 may also include an energy storage device 200, which is electrically connected to the energy storage converter 400. The energy storage converter 400 converts the electric energy provided by the power generation device 3000 into the energy storage device 200 for storage.

[0125] The power conversion device is connected between the power generation device 3000 and the energy storage device 200. The power generation device 3000 is used to generate electrical energy, and the power generation device 3000 is used to store the generated electrical energy in the energy storage device 200 via the power conversion device. The use of the energy storage device 200 in the energy storage system 2000 can effectively improve the operational safety of the energy storage system 2000. In a specific implementation, the power generation equipment can specifically include solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. The specific type of power generation equipment is not limited in this application.

[0126] As an example, Figure 2As shown, the energy storage system 2000 includes an energy storage device 200 and an energy storage conversion device 400. The two power generation devices 3000 respectively transmit the generated electric energy to the energy storage conversion device 400, and the electric energy is introduced into the energy storage device 200 for storage through the energy storage conversion device 400.

[0127] Please refer to Figure 3 The energy storage device 200 includes an energy storage box 210 , in which the battery device 100 is disposed.

[0128] As an example, the energy storage device 200 may be an energy storage container, an energy storage cabinet, etc.

[0129] As an example, the energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage power station can store electric energy during low power consumption periods and provide electric energy to relevant users or electrical equipment during peak power consumption periods. The wind energy collected by the wind turbines of the wind power generation system is converted into electric energy and then stored by the energy storage device 200. The solar power generation system can convert solar energy into electric energy, which is then stored by the energy storage device 200 and supplied to users in a timely manner. The mobile power system can supply power to relevant electrical equipment in places where the power grid power supply system cannot reach, such as remote mountainous areas, remote wilderness areas, etc. The temporary power supply system can provide power to users when the power supply is insufficient.

[0130] According to some embodiments of this application, please refer to Figures 4 to 9 , Figure 4 is a schematic diagram of the exploded structure of the battery device 100 in some embodiments of the present application, Figure 5 is a schematic structural diagram of another battery device 100 in some embodiments of the present application. Figure 6 Schematic diagram of the exploded structure of the first battery cell 21 in some embodiments of the present application. Figure 7 for Figure 5 Schematic diagram of the decomposition structure, Figure 8 for Figure 5 The cross-sectional view at AA in the middle, Figure 9 for Figure 8 Enlarged schematic diagram of point A in the middle.

[0131] The present application provides a battery device 100, including a first battery cell group 20, a second battery cell group 30 and a partition beam 40, the first battery cell group 20 includes a plurality of first battery cells 21 arranged along a first direction x, the second battery cell group 30 includes a plurality of second battery cells 31 arranged along the first direction x, the first battery cell group 20 and the second battery cell group 30 are arranged along a second direction y, and the second direction y intersects with the first direction x.

[0132] The partition beam 40 is disposed between the first battery cell group 20 and the second battery cell group 30 .

[0133] Among them, a first pressure relief mechanism 214 is provided on the side of the first battery cell 21 facing the partition beam 40, a second pressure relief mechanism 311 is provided on the side of the second battery cell 31 facing the partition beam 40, and a first collecting chamber 40a is provided inside the partition beam 40. The first collecting chamber 40a is used to collect the emissions of the first battery cell 21 when the first pressure relief mechanism 214 is actuated, and to collect the emissions of the second battery cell 31 when the second pressure relief mechanism 311 is actuated.

[0134] In the same projection plane perpendicular to the second direction y, the orthographic projection of the first pressure relief mechanism 214 and the orthographic projection of the second pressure relief mechanism 311 do not overlap.

[0135] The first battery cell group 20 is an assembly consisting of a plurality of first battery cells 21 connected in series, in parallel, or in mixed series.

[0136] The second battery cell group 30 is an assembly consisting of a plurality of second battery cells 31 connected in series, in parallel, or in mixed series.

[0137] The first battery cell 21 has the same structure as the second battery cell 31. For example, taking the first battery cell 21 as an example, refer to Figure 6 The first battery cell 21 further includes a housing 211 , a battery cell assembly 212 and other functional components.

[0138] The outer shell 211 includes an end cap 2111 and a housing 2112. The end cap 2111 covers the opening of the housing 2112 to isolate the internal environment of the battery cell from the external environment. The shape of the end cap 2111 can be adapted to match the shape of the housing 2112 to fit the housing 2112. Optionally, the end cap 2111 can be made of a material with a certain degree of hardness and strength (such as aluminum alloy). This reduces deformation during compression and collision, providing the first battery cell 21 with greater structural strength and improved safety. Functional components such as a terminal 213 can be provided on the end cap 2111. The terminal 213 can be used to electrically connect to the battery cell assembly 212 to transmit or receive electrical energy from the first battery cell 21. In some embodiments, the end cap 2111 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the first battery cell 21 reaches a threshold. End cap 2111 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiment. In some embodiments, an insulating member can be disposed inside end cap 2111 to isolate electrical components within housing 2112 from end cap 2111, thereby reducing the risk of short circuits. Exemplary insulating members can be made of plastic, rubber, and the like.

[0139] The housing 2112 is a component that cooperates with the end cap 2111 to form an internal environment for the first battery cell 21. This internal environment can be used to accommodate the battery cell assembly 212, electrolyte, and other components. The housing 2112 and the end cap 2111 can be separate components. An opening can be provided in the housing 2112, and the end cap 2111 is closed over the opening to form the internal environment of the first battery cell 21. Alternatively, the end cap 2111 and the housing 2112 can be integrated. Specifically, the end cap 2111 and the housing 2112 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 2112 needs to be encapsulated, the end cap 2111 is closed over the housing 2112. The housing 2112 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 2112 can be determined based on the specific shape and size of the battery cell assembly 212. The shell 2112 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0140] The battery cell assembly 212 is a component in the first battery cell 21 where electrochemical reactions occur. One or more battery cell assemblies 212 may be contained in the shell 2112. The battery cell assembly 212 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active substances constitute the main body of the battery cell assembly 212, and the parts of the positive and negative electrode sheets without active substances each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery device 100, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0141] The first direction x and the second direction y are two horizontal directions perpendicular to each other. For example, the first direction x may be parallel to the width direction of the battery device 100, and the second direction y may be parallel to the length direction of the battery device 100; or, the first direction x may be parallel to the length direction of the battery device 100, and the second direction y may be parallel to the width direction of the battery device 100.

[0142] The pressure relief mechanism (including the first pressure relief mechanism 214 and the second pressure relief mechanism 311) refers to an element or component that is activated to release the internal pressure or temperature when the internal pressure, temperature, or other conditions of the battery cell reach a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on the material of one or more of the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell. The pressure relief mechanism can take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure, temperature, or other conditions of the battery cell reach a predetermined threshold, the pressure relief mechanism is activated or the weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0143] The pressure relief mechanism may be an explosion-proof valve, specifically an explosion-proof disk.

[0144] The "activation" mentioned in the embodiments of the present application refers to the action of the pressure relief mechanism or its activation to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism may include but is not limited to: at least a part of the pressure relief mechanism is broken, shattered, melted, torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0145] In the technical solution of the embodiment of the present application, because the orthographic projection of the first pressure relief mechanism 214 on the projection plane does not overlap with the orthographic projection of the second pressure relief mechanism 311 on the projection plane, the first pressure relief mechanism 214 can be staggered with the second pressure relief mechanism 311. After a battery cell experiences thermal runaway, the emissions ejected from the pressure relief mechanism of the thermally runaway battery cell are unlikely to be directly ejected onto the pressure relief mechanism of the battery cell on the opposite side, thereby preventing the thermal runaway from spreading to the battery cell on the opposite side and thereby improving the reliability of the power battery device 100.

[0146] For example, when a first battery cell 21 in a first battery cell group 20 experiences thermal runaway, it is difficult for the exhaust gas ejected from the first pressure relief mechanism 214 of the thermally runaway first battery cell 21 to be directly ejected to the second battery cell 31 of the second battery cell group 30 on the opposite side. When a second battery cell 31 in a second battery cell group 30 experiences thermal runaway, it is difficult for the exhaust gas ejected from the second pressure relief mechanism 311 of the thermally runaway second battery cell 31 to be directly ejected to the first battery cell 21 of the first battery cell group 20 on the opposite side.

[0147] According to some embodiments of the present application, referring to Figure 7 , and refer to Figure 16 , Figure 16 for Figure 7 Schematic diagram of the structure of the first battery cell group 20, the first battery cell 21 has a first surface 21a facing the partition beam 40, and the first pressure relief mechanism 214 is eccentrically arranged on the first surface 21a, that is, the center point of the first pressure relief mechanism 214 is located on one side of the center point of the first surface 21a in a direction perpendicular to the second direction y.

[0148] Exemplarily, the first surface 21a is parallel to the projection plane. The first pressure relief mechanism 214 is located on one side of the center point of the first surface 21a in the third direction z. In this case, the first pressure relief mechanism 214 is located closer to the positive electrode post or the negative electrode post of the first battery cell 21 along the third direction z.

[0149] By eccentrically arranging the first pressure relief mechanism 214 on the first surface 21a facing the partition beam 40, the orthographic projection of the first pressure relief mechanism 214 in the projection plane does not overlap with the orthographic projection of the second pressure relief mechanism 311 in the projection plane, thereby achieving the staggered arrangement of the first pressure relief mechanism 214 and the second pressure relief mechanism 311.

[0150] According to some embodiments of the present application, referring to Figure 7 , and refer to Figure 17 , Figure 17 for Figure 7Schematic diagram of the structure of the second battery cell group 30, the second battery cell 31 has a second surface 31a facing the partition beam 40, and the second pressure relief mechanism 311 is eccentrically arranged on the second surface 31a, that is, the center point of the second pressure relief mechanism 311 is located on one side of the center point of the second surface 31a in a direction perpendicular to the second direction y.

[0151] Exemplarily, the second surface 31a is parallel to the projection plane. The second pressure relief mechanism 311 is located on one side of the center point of the second surface 31a in the direction of the third direction z. At this time, the second pressure relief mechanism 311 is closer to the positive electrode post or the negative electrode post of the second battery cell 31 along the third direction z.

[0152] By eccentrically arranging the second pressure relief mechanism 311 on the second surface 31a facing the partition beam 40, the orthographic projection of the first pressure relief mechanism 214 in the projection plane does not overlap with the orthographic projection of the second pressure relief mechanism 311 in the projection plane, thereby achieving the staggered arrangement of the first pressure relief mechanism 214 and the second pressure relief mechanism 311.

[0153] According to some embodiments of the present application, referring to Figure 7 、 Figure 16-17 The first battery cells 21 and the second battery cells 31 have the same structure, and each first battery cell 21 is rotated 180 degrees relative to the second battery cell 31 opposite to the first battery cell 21 .

[0154] Each first battery cell 21 is arranged to be rotated 180 degrees relative to the second battery cell 31 opposite to the first battery cell 21, which means that between the first battery cell 21 and the second battery cell 31 opposite to each other along the second direction y, the first battery cell 21 is arranged to be rotated 180 degrees relative to the second battery cell 31 around a rotation axis parallel to the first direction x.

[0155] For example, referring to Figure 16-17 In the up-down direction shown, the first pressure relief mechanism 214 of the first battery cell 21 is arranged near the top, and the second pressure relief mechanism 311 of the second battery cell 31 is arranged near the bottom, and the distance between the center of the first pressure relief mechanism 214 and the center of the first surface 21a where it is located is the same as the distance between the center of the second pressure relief mechanism 311 and the center of the second surface 31a where it is located.

[0156] When the first battery cell 21 and the second battery cell 31 have the same structure, the first battery cell 21 and the second battery cell 31 can be arranged so that the first battery cell 21 is rotated 180 degrees relative to the second battery cell 31. This arrangement can achieve the staggered arrangement of the first pressure relief mechanism 214 and the second pressure relief mechanism 311, and can also simplify the internal structure of the battery device 100.

[0157] According to some embodiments of the present application, referring to Figure 7 、 Figure 16-17 In the projection plane, the orthographic projection of the first pressure relief mechanism 214 and the orthographic projection of the second pressure relief mechanism 311 are offset along the first direction x; and / or, in the projection plane, the orthographic projection of the first pressure relief mechanism 214 and the orthographic projection of the second pressure relief mechanism 311 are offset along the third direction z. The third direction z and the second direction y are perpendicular to the first direction x.

[0158] When the first battery cell 21 and the second battery cell 31 have the same structure, the orthographic projection of the first pressure relief mechanism 214 in the projection plane and the orthographic projection of the second pressure relief mechanism 311 in the projection plane are staggered in the first direction x and / or the third direction z so that the orthographic projection of the first pressure relief mechanism 214 in the projection plane and the orthographic projection of the second pressure relief mechanism 311 in the projection plane do not overlap.

[0159] According to some embodiments of the present application, referring to Figure 16-17 The centers of the first pressure relief mechanisms 214 are located on the same side of the centers of the first surfaces 21 a where they are located, so that the arrangement of the first battery cells 21 is more orderly.

[0160] The centers of the second pressure relief mechanisms 311 are located on the same side of the center of the second surface 31 a , so that the second battery cells 31 are arranged more neatly.

[0161] For example, referring to Figure 16-17 In the vertical direction shown, the first pressure relief mechanism 214 of each first battery cell 21 is disposed close to the top, and the second pressure relief mechanism 311 of each second battery cell 31 is disposed close to the bottom.

[0162] According to some embodiments of the present application, referring to Figure 20-21 , Figure 20 2 is a structural diagram of a first battery cell group 20 of another battery device 100 in some embodiments of the present application. Figure 21 This is a structural schematic diagram of a second battery cell group 30 of another battery device 100 in some embodiments of the present application. Among two adjacent first battery cells 21, one of the first battery cells 21 is rotated 180 degrees relative to the other first battery cell 21, that is, between two adjacent first battery cells 21 along the first direction x, one of the first battery cells 21 is rotated 180 degrees relative to the other first battery cell 21 around a rotation axis parallel to the second direction y.

[0163] Among two adjacent second battery cells 31, one of the second battery cells 31 is rotated 180 degrees relative to the other second battery cell 31, that is, between two adjacent second battery cells 31 along the first direction x, one of the second battery cells 31 is rotated 180 degrees relative to the other second battery cell 31 around a rotation axis parallel to the second direction y.

[0164] If the first battery cell 21 and the second battery cell 31 have the same structure, provided that the first battery cell 21 is rotated 180 degrees relative to the second battery cell 31 between the opposing first and second battery cells 21, one of the two adjacent first battery cells 21 can be rotated 180 degrees relative to the other, and one of the two second battery cells 31 can be rotated 180 degrees relative to the other. This allows the exhaust from the pressure relief mechanism of a battery cell experiencing thermal runaway to be directed toward the pressure relief mechanism of the battery cell opposite it, simplifying the internal structure of the battery device 100. In this case, the pressure relief mechanism of any battery cell is staggered relative to the pressure relief mechanism of its adjacent battery cell, and the pressure relief mechanism of any battery cell is staggered relative to the pressure relief mechanism of the battery cell opposite it.

[0165] According to some embodiments of the present application, the first battery cell 21 and the second battery cell 31 have different structures.

[0166] Within the projection plane, the orthographic projection of the first pressure relief mechanism 214 and the orthographic projection of the second pressure relief mechanism 311 are offset along a first direction x; and / or, within the projection plane, the orthographic projection of the first pressure relief mechanism 214 and the orthographic projection of the second pressure relief mechanism 311 are offset along a third direction z. The third direction z and the second direction y are perpendicular to the first direction x.

[0167] When the structures of the first battery cell 21 and the second battery cell 31 are different, the orthographic projection of the first pressure relief mechanism 214 in the projection plane and the orthographic projection of the second pressure relief mechanism 311 in the projection plane are staggered in the first direction x and / or the third direction z so that the orthographic projection of the first pressure relief mechanism 214 in the projection plane and the orthographic projection of the second pressure relief mechanism 311 in the projection plane do not overlap.

[0168] According to some embodiments of the present application, referring to Figure 9 , and refer to Figure 18-19 、 Figure 22-23 , Figure 18 for Figure 7 A schematic structural diagram of the partition beam 40 in FIG. Figure 19 for Figure 18 A structural diagram from another angle, Figure 22 FIG. 4 is a structural diagram of a partition beam 40 of another battery device 100 in some embodiments of the present application. Figure 23for Figure 22 A structural diagram from another angle shows that a first vent hole 403 communicating with the first collecting chamber 40 a is provided on the side of the partition beam 40 facing the first battery cell 21 , and the first vent hole 403 corresponds to the position of the first pressure relief mechanism 214 .

[0169] A second vent hole 404 communicating with the first collecting chamber 40 a is provided on a side of the partition beam 40 facing the second battery cell 31 . The second vent hole 404 corresponds to the position of the second pressure relief mechanism 311 .

[0170] By providing a first vent hole 403 on the side of the separation beam 40 facing the first battery cell 21, when the first pressure relief mechanism 214 is activated, the exhaust from the first battery cell 21 can be directly discharged into the first collection chamber 40a through the first vent hole 403. Simultaneously, by providing a second vent hole 404 on the side of the separation beam 40 facing the second battery cell 31, when the second pressure relief mechanism 311 is activated, the exhaust from the second battery cell 31 can be directly discharged into the first collection chamber 40a through the second vent hole 404.

[0171] According to some embodiments of the present application, referring to Figure 7-Figure 9 Within the projection plane, the orthographic projection of the first vent hole 403 covers the orthographic projection of the first pressure relief mechanism 214. Exemplarily, the shape of the first vent hole 403 matches the shape of the first pressure relief mechanism 214, and the cross-sectional area of ​​the first vent hole 403 is not less than the cross-sectional area of ​​the first pressure relief mechanism 214, so that the orthographic projection of the first vent hole 403 can cover the orthographic projection of the first pressure relief mechanism 214.

[0172] By ensuring that the orthographic projection of the first vent hole 403 within the projection plane covers the orthographic projection of the first pressure relief mechanism 214 within the projection plane, the first pressure relief mechanism 214 is unobstructed, facilitating its rapid opening. This prevents the first pressure relief mechanism 214 from being blocked by the partition beam 40 during actuation, preventing it from being unable to open or fully open. This, in turn, prevents the first battery cell 21 from experiencing thermal runaway and prevents the internal pressure of the first battery cell 21 from being rapidly released, potentially causing the outer shell of the first battery cell 21 to rupture or explode. Furthermore, this prevents the metal structure of the first pressure relief mechanism 214 from simultaneously contacting the outer shell of the first battery cell 21 and the partition beam 40 when the first pressure relief mechanism 214 is actuated. This simultaneous contact with the outer shell of the first battery cell 21 and the partition beam 40 could result in electrical connection, which could cause a short circuit between the first battery cells 21 when multiple first battery cells 21 are simultaneously electrically connected to the partition beam 40.

[0173] According to some embodiments of the present application, referring to Figure 7The battery device 100 further includes a first thermal insulation pad 50 , which is disposed between the partition beam 40 and the first battery cell group 20 . The first thermal insulation pad 50 is provided with a first avoidance hole 51 , which is communicated with the first vent hole 403 .

[0174] The first thermal insulation pad 50 can be a thin plate with high temperature resistance and thermal insulation properties, such as an epoxy plate or a mica plate.

[0175] By disposing a first thermal insulation pad 50 between the partition beam 40 and the first battery cell group 20, the first thermal insulation pad 50 prevents heat generated by the first battery cell 21 in thermal runaway from being transferred to other battery cells via the partition beam 40, causing thermal diffusion. It also prevents heat from the exhaust discharged into the first collection chamber 40a from being transferred to other battery cells via the partition beam 40, causing thermal diffusion. The first avoidance hole 51 is provided to prevent the first pressure relief mechanism 214 from being blocked by the first thermal insulation pad 50 when it is activated.

[0176] According to some embodiments of the present application, referring to Figure 7 , within the projection plane, the orthographic projection of the first avoidance hole 51 overlaps the orthographic projection of the first vent 403. For example, the shape of the first avoidance hole 51 can match the shape of the first vent 403, and the cross-sectional area of ​​the first avoidance hole 51 can be consistent with the cross-sectional area of ​​the first vent 403. In this case, the size of the first avoidance hole 51 is consistent with the size of the first vent 403.

[0177] By making the orthographic projection of the first avoidance hole 51 in the projection plane cover the orthographic projection of the first vent hole 403 in the projection plane, the first pressure relief mechanism 214 is facilitated to open quickly, thereby preventing the first pressure relief mechanism 214 from being unable to open or unable to open completely due to being blocked by the first thermal insulation pad 50 when actuated.

[0178] According to some embodiments of the present application, referring to Figure 7 The orthographic projection of the center of the first pressure relief mechanism 214 in the first projection plane, the orthographic projection of the center of the first vent hole 403 in the first projection plane, and the orthographic projection of the center of the first avoidance hole 51 in the first projection plane overlap, so that the discharge ejected from the first pressure relief mechanism 214 can quickly enter the first sub-chamber 401.

[0179] According to some embodiments of the present application, referring to Figure 7-Figure 9 Within the projection plane, the orthographic projection of the second vent hole 404 overlaps the orthographic projection of the second pressure relief mechanism 311. Exemplarily, the shape of the second vent hole 404 matches the shape of the second pressure relief mechanism 311, and the cross-sectional area of ​​the second vent hole 404 is not less than the cross-sectional area of ​​the second pressure relief mechanism 311, so that the orthographic projection of the second vent hole 404 can overlap the orthographic projection of the second pressure relief mechanism 311.

[0180] By ensuring that the orthographic projection of the second vent hole 404 within the projection plane overlaps the orthographic projection of the second pressure relief mechanism 311 within the projection plane, the second pressure relief mechanism 311 is unobstructed, facilitating its rapid opening. This prevents the second pressure relief mechanism 311 from being blocked by the partition beam 40 during actuation, preventing it from being unable to open or fully open. This, in turn, prevents the second battery cell 31 from experiencing thermal runaway and prevents the internal pressure of the second battery cell 31 from being rapidly released, potentially causing the outer shell of the second battery cell 31 to rupture or explode. Furthermore, this prevents the metal structure of the second pressure relief mechanism 311 from simultaneously contacting the outer shell of the second battery cell 31 and the partition beam 40 when the second pressure relief mechanism 311 is actuated. This simultaneous contact with the outer shell of the second battery cell 31 and the partition beam 40 could result in electrical connection, which could cause a short circuit between the second battery cells 31 when multiple second battery cells 31 are electrically connected to the partition beam 40.

[0181] According to some embodiments of the present application, referring to Figure 7 The battery device 100 further includes a second thermal insulation pad 60 , which is disposed between the partition beam 40 and the second battery cell group 30 . The second thermal insulation pad 60 is provided with a second avoidance hole 61 , which is communicated with the second vent hole 404 .

[0182] The second thermal insulation pad 60 can be a thin plate with high temperature resistance and thermal insulation properties, such as an epoxy plate or a mica plate.

[0183] By disposing a second thermal insulation pad 60 between the partition beam 40 and the second battery cell group 30, the second thermal insulation pad 60 prevents heat generated by the second battery cell 31 in thermal runaway from being transferred to other battery cells via the partition beam 40, causing thermal diffusion. It also prevents heat from the exhaust discharged into the first collection chamber 40a from being transferred to other battery cells via the partition beam 40, causing thermal diffusion. The second avoidance hole 61 is provided to prevent the second pressure relief mechanism 311 from being blocked by the second thermal insulation pad 60 when it is activated.

[0184] According to some embodiments of the present application, referring to Figure 7 , within the projection plane, the orthographic projection of the second avoidance hole 61 overlaps the orthographic projection of the second vent 404. For example, the shape of the second avoidance hole 61 can match the shape of the second vent 404, and the cross-sectional area of ​​the second avoidance hole 61 can be consistent with the cross-sectional area of ​​the second vent 404. In this case, the size of the second avoidance hole 61 is consistent with the size of the second vent 404.

[0185] By making the orthographic projection of the second avoidance hole 61 in the projection plane cover the orthographic projection of the second vent hole 404 in the projection plane, the second pressure relief mechanism 311 is facilitated to open quickly, thereby preventing the second pressure relief mechanism 311 from being unable to open or unable to open completely due to being blocked by the second thermal insulation pad 60 when actuated.

[0186] According to some embodiments of the present application, referring to Figure 7 The orthographic projection of the center of the second pressure relief mechanism 311 in the second projection plane, the orthographic projection of the center of the second vent hole 404 in the second projection plane, and the orthographic projection of the center of the second avoidance hole 61 in the second projection plane overlap, so that the discharge ejected from the second pressure relief mechanism 311 can quickly enter the second sub-chamber 402.

[0187] According to some embodiments of the present application, referring to Figure 9 、 Figure 18-19 、 Figure 22-23 The partition beam 40 includes a beam body 41 and a partition 42. A first collecting chamber 40a is provided in the beam body 41. The partition 42 is provided in the first collecting chamber 40a and divides the first collecting chamber 40a into a first sub-chamber 401 and a second sub-chamber 402 that are not connected to each other.

[0188] The first sub-chamber 401 is used to collect the emissions from one of the first battery cell 21 and the second battery cell 31 that are opposite to each other along the second direction y, and the second sub-chamber 402 is used to collect the emissions from the other of the first battery cell 21 and the second battery cell 31 that are opposite to each other along the second direction y. Figure 18-19 In the embodiment shown, the first sub-chamber 401 is used to collect the exhaust of each first battery cell 21, and the second sub-chamber 402 is used to collect the exhaust of each second battery cell 31. Figure 22-23 In the illustrated embodiment, the first sub-chamber 401 is used to collect emissions from a portion of the first battery cells 21 and a portion of the second battery cells 31 , and the second sub-chamber 402 is used to collect emissions from the remaining first battery cells 21 and the remaining second battery cells 31 .

[0189] The first vent hole 403 is disposed on a side of the beam body 41 close to the first battery cell 21 , and the second vent hole 404 is disposed on a side of the beam body 41 close to the second battery cell 31 .

[0190] By arranging the partition 42 in the first collecting chamber 40a of the beam body 41, the first collecting chamber 40a is divided into a first sub-chamber 401 and a second sub-chamber 402 that are not connected to each other through the partition 42. Since the first sub-chamber 401 can collect the emissions of one of the first battery cell 21 and the second battery cell 31 opposite to each other along the second direction y, the second sub-chamber 402 can collect the emissions of the other of the first battery cell 21 and the second battery cell 31 opposite to each other along the second direction y, the emissions of the first battery cell 21 and the second battery cell 31 opposite to each other along the second direction y can be collected in different sub-chambers respectively, further avoiding the emissions sprayed out of the pressure relief mechanism of the battery cell in thermal runaway from being directly sprayed onto the pressure relief mechanism of the battery cell on the opposite side, thereby improving the reliability of the power battery device 100.

[0191] According to some embodiments of the present application, referring to Figure 9 The beam body 41 includes a first side plate 411, a second side plate 412, a third side plate 413, and a fourth side plate 414. The first side plate 411 is adjacent to the first battery cell 21, and the second side plate 412 is adjacent to the second battery cell 31. The third side plate 413 and the fourth side plate 414 are disposed opposite each other along a third direction z, and are connected between the first side plate 411 and the second side plate 412, respectively. The third direction z and the second direction y are perpendicular to the first direction x. For example, the third direction z can be parallel to the thickness direction of the battery device 100.

[0192] The partition 42 is connected between the first side plate 411 and the second side plate 412 .

[0193] The first sub-cavity 401 is formed between the first side plate 411 , the second side plate 412 , the third side plate 413 and the partition 42 . The second sub-cavity 402 is formed between the first side plate 411 , the second side plate 412 , the fourth side plate 414 and the partition 42 .

[0194] The first collecting chamber 40a is surrounded by the first side plate 411, the second side plate 412, the third side plate 413 and the fourth side plate 414. By connecting the partition 42 between the first side plate 411 and the second side plate 412, the first collecting chamber 40a of the beam body 41 is divided into two, forming a first sub-chamber 401 and a second sub-chamber 402, thereby providing collection space for the emissions of the first battery cell 21 and the second battery cell 31 respectively.

[0195] According to some embodiments of the present application, referring to Figure 18-19 、 Figure 22-23 The beam body 41 and the partition 42 are integrally formed.

[0196] The partition member 42 is configured as a structure integrally formed with the beam body 41 to improve the integration of the partition beam 40 and simplify the structure of the battery device 100 .

[0197] According to some embodiments of the present application, referring to Figure 4 and Figure 7 The battery device 100 further includes a box body 10 , which is used to provide a storage space for battery cells (including a first battery cell 21 and a second battery cell 31 ). The box body 10 may adopt various structures.

[0198] For example, referring to Figure 4 The housing 10 may include a first portion 11 and a second portion 12. The first portion 11 and the second portion 12 overlap each other and together define a storage space for accommodating a battery cell. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure. The first portion 11 overlaps the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 may also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12.

[0199] Of course, the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc. Figure 4 In the embodiment, the box body 10 is in the shape of a cuboid.

[0200] In the battery device 100, there may be multiple battery cells, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells may be directly connected in series, in parallel, or in a hybrid connection, and the entire battery cell structure may then be housed within the housing 10. Of course, the battery device 100 may also comprise multiple battery cells connected in series, in parallel, or in a hybrid connection to form a battery device module, which may then be connected in series, in parallel, or in a hybrid connection to form a single unit, housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells.

[0201] Each battery cell may be a secondary battery device, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0202] According to some embodiments of the present application, referring to Figure 5 、 Figure 7 , and refer to Figure 10-15 , Figure 10 for Figure 7Schematic diagram of the assembly of the first end plate 13, the second end plate 14 and the bottom plate 15, Figure 11 for Figure 10 Assembly diagram from another angle, Figure 12 for Figure 7 Schematic diagram of the assembly of the partition beam 40, the first end plate 13, the second end plate 14 and the bottom plate 15, Figure 13 for Figure 12 Cross-sectional view at the middle BB, Figure 14 for Figure 13 The enlarged schematic diagram of point B in the middle is shown in Figure 2. Figure 15 for Figure 13 Enlarged schematic diagram at point C. The housing 10 includes a first end plate 13 and a second end plate 14 . The first end plate 13 and the second end plate 14 are spaced apart along a first direction x. The first battery cell group 20 and the second battery cell group 30 are disposed between the first end plate 13 and the second end plate 14 . A partition beam 40 is connected between the first end plate 13 and the second end plate 14 .

[0203] A second collecting chamber 131 is provided in the first end plate 13 , and a third collecting chamber 141 is provided in the second end plate 14 .

[0204] The first sub-chamber 401 is in communication with the second collecting chamber 131, while the second sub-chamber 402 is not in communication with the second collecting chamber 131. The second sub-chamber 402 is in communication with the third collecting chamber 141, while the first sub-chamber 401 is not in communication with the third collecting chamber 141.

[0205] The two ends of the partition beam 40 can be sealed with the first end plate 13 and the second end plate 14 respectively. The sealing connection can be designed to be welded or bolted and then sealed by gluing.

[0206] By allowing the emissions from the first battery cell 21 to enter the second collecting chamber 131 through the first sub-chamber 401, and the emissions from the second battery cell 31 to enter the third collecting chamber 141 through the second sub-chamber 402, the two battery cell groups have independent emission channels, so that the emissions from the battery cell in thermal runaway cannot affect the battery cell on the opposite side.

[0207] According to some embodiments of the present application, referring to Figure 7 、 Figure 10-15 The box body 10 further includes a bottom plate 15 , which carries the first battery cell group 20 and the second battery cell group 30 . The partition beam 40 , the first end plate 13 and the second end plate 14 are all connected to the bottom plate 15 .

[0208] The bottom plate 15 is provided to enable installation of the partition beam 40 , the first end plate 13 and the second end plate 14 .

[0209] According to some embodiments of the present application, referring to Figure 14-15The first end plate 13 is further provided with a third vent hole 132 communicating with the second collecting chamber 131 , and the first sub-chamber 401 is communicated with the third vent hole 132 .

[0210] The second end plate 14 is further provided with a fourth vent hole 142 communicating with the third collecting chamber 141 , and the second sub-chamber 402 is communicated with the fourth vent hole 142 .

[0211] The third vent hole 132 can be composed of multiple small holes or a large hole (such as Figure 15 shown).

[0212] The fourth vent hole 142 can be composed of multiple small holes or a large hole (such as Figure 14 shown).

[0213] By providing the third vent hole 132 on the first end plate 13, the first sub-cavity 401 can communicate with the second collection cavity 131 through the third vent hole 132, allowing the exhaust from the first battery cell 21 to enter the second collection cavity 131 through the first sub-cavity 401 and the third vent hole 132. By providing the fourth vent hole 142 on the second end plate 14, the second sub-cavity 402 can communicate with the third collection cavity 141 through the fourth vent hole 142, allowing the exhaust from the second battery cell 31 to enter the third collection cavity 141 through the second sub-cavity 402 and the fourth vent hole 142.

[0214] According to some embodiments of the present application, referring to Figure 7 Along the first direction x, a third thermal insulation pad 16 is provided between the first battery cell group 20 and the first end plate 13, a fourth thermal insulation pad 17 is provided between the first battery cell group 20 and the second end plate 14, a fifth thermal insulation pad 18 is provided between the second battery cell group 30 and the first end plate 13, and a sixth thermal insulation pad 19 is provided between the second battery cell group 30 and the second end plate 14.

[0215] The third thermal insulation pad 16 is used to prevent the first battery cell 21 in thermal runaway from transferring thermal runaway heat to other battery cells through the first end plate 13, causing thermal diffusion. The fourth thermal insulation pad 17 is used to prevent the first battery cell 21 in thermal runaway from transferring thermal runaway heat to other battery cells through the second end plate 14, causing thermal diffusion. The fifth thermal insulation pad 18 is used to prevent the second battery cell 31 in thermal runaway from transferring thermal runaway heat to other battery cells through the first end plate 13, causing thermal diffusion. The sixth thermal insulation pad 19 is used to prevent the second battery cell 31 in thermal runaway from transferring thermal runaway heat to other battery cells through the second end plate 14, causing thermal diffusion.

[0216] According to some embodiments of the present application, referring to Figure 3 The present application also provides an energy storage device 200, which includes the battery device 100 of any of the above solutions.

[0217] According to some embodiments of the present application, referring to Figure 2 The present application also provides an energy storage system 2000, which includes an energy storage converter device 400 and the energy storage device 200 of any of the above schemes, and the energy storage converter device 400 is used to electrically connect the power generation device 3000 and the energy storage device 200.

[0218] According to some embodiments of the present application, referring to Figure 1 The present application also provides a charging network 1000 , which includes a charging pile 300 and an energy storage device 200 of any of the above solutions, and the energy storage device 200 is used to provide electrical energy to the charging pile 300 .

[0219] According to some embodiments of the present application, see Figure 5 、 Figure 7-Figure 19 The present application provides a battery device 100, including a box body 10, a first battery cell group 20, a second battery cell group 30, a partition beam 40, a first thermal insulation pad 50 and a second thermal insulation pad 60, the box body 10 includes a first end plate 13, a second end plate 14 and a bottom plate 15, the partition beam 40, the first end plate 13 and the second end plate 14 are all connected to the bottom plate 15, and the first end plate 13 and the second end plate 14 are arranged at intervals along the first direction x, and the partition beam 40 is connected between the first end plate 13 and the second end plate 14.

[0220] The first battery cell group 20 and the second battery cell group 30 are disposed between the first end plate 13 and the second end plate 14, and the first battery cell group 20 and the second battery cell group 30 are arranged along the second direction y. The first battery cell group 20 includes a plurality of first battery cells 21 arranged along the first direction x, and the second battery cell group 30 includes a plurality of second battery cells 31 arranged along the first direction x.

[0221] The partition beam 40 is located between the first battery cell group 20 and the second battery cell group 30. The interior of the partition beam 40 is provided with a first sub-cavity 401 and a second sub-cavity 402 arranged along the third direction z and not communicating with each other. The partition beam 40 is also provided with a first vent hole 403 corresponding to the position of the first pressure relief mechanism 214 and a second vent hole 404 corresponding to the position of the second pressure relief mechanism 311.

[0222] The first and second battery cells 21 and 31 have the same structure. Each first battery cell 21 is rotated 180 degrees relative to the second battery cell 31 opposite it. The first pressure relief mechanism 214 of each first battery cell 21 is positioned toward the top, so that the second pressure relief mechanism 311 of each rotated second battery cell 31, when assembled, is positioned toward the bottom. Consequently, each first vent hole 403 communicates with the first sub-cavity 401 located toward the top, and each second vent hole 404 communicates with the second sub-cavity 402 located toward the bottom.

[0223] The first thermal insulation pad 50 is disposed between the partition beam 40 and the first battery cell group 20 and is provided with a first avoidance hole 51 . The second thermal insulation pad 60 is disposed between the partition beam 40 and the second battery cell group 30 and is provided with a second avoidance hole 61 .

[0224] When the first pressure relief mechanism 214 is activated, the exhaust from the first battery cell 21 sequentially flows through the first avoidance hole 51 and the first vent hole 403 into the first sub-chamber 401, where it is collected by the first sub-chamber 401. When the second pressure relief mechanism 311 is activated, the exhaust from the second battery cell 31 sequentially flows through the second avoidance hole 61 and the second vent hole 404 into the second sub-chamber 402, where it is collected by the second sub-chamber 402.

[0225] The shape of the first vent hole 403 matches the shape of the first pressure relief mechanism 214 , and the cross-sectional area of ​​the first vent hole 403 is not less than the cross-sectional area of ​​the first pressure relief mechanism 214 , so that the orthographic projection of the first vent hole 403 can cover the orthographic projection of the first pressure relief mechanism 214 .

[0226] The shape of the first avoidance hole 51 matches the shape of the first ventilation hole 403, and the cross-sectional area of ​​the first avoidance hole 51 is consistent with the cross-sectional area of ​​the first ventilation hole 403, so that the orthographic projection of the first avoidance hole 51 can cover the orthographic projection of the first ventilation hole 403. At this time, the size of the first avoidance hole 51 is consistent with the size of the first ventilation hole 403.

[0227] The orthographic projection of the center of the first pressure relief mechanism 214 in the projection plane, the orthographic projection of the center of the first vent hole 403 in the first projection plane and the orthographic projection of the center of the first avoidance hole 51 in the projection plane overlap, so that the discharge ejected from the first pressure relief mechanism 214 can quickly enter the first sub-chamber 401.

[0228] The shape of the second vent hole 404 matches that of the second pressure relief mechanism 311 , and the cross-sectional area of ​​the second vent hole 404 is not less than the cross-sectional area of ​​the second pressure relief mechanism 311 , so that the orthographic projection of the second vent hole 404 can cover the orthographic projection of the second pressure relief mechanism 311 .

[0229] The shape of the second avoidance hole 61 matches the shape of the second ventilation hole 404, and the cross-sectional area of ​​the second avoidance hole 61 is consistent with the cross-sectional area of ​​the second ventilation hole 404, so that the orthographic projection of the second avoidance hole 61 can cover the orthographic projection of the second ventilation hole 404. At this time, the size of the second avoidance hole 61 is consistent with the size of the second ventilation hole 404.

[0230] The orthographic projection of the center of the second pressure relief mechanism 311 in the projection plane, the orthographic projection of the center of the second vent hole 404 in the projection plane and the orthographic projection of the center of the second avoidance hole 61 in the projection plane overlap, so that the discharge ejected from the second pressure relief mechanism 311 can quickly enter the second sub-chamber 402.

[0231] The first end plate 13 is provided with a second collection chamber 131 and a third vent 132 communicating with the second collection chamber 131. The second end plate 14 is provided with a third collection chamber 141 and a fourth vent 142 communicating with the third collection chamber 141. The first sub-chamber 401 communicates with the second collection chamber 131 via the third vent 132, allowing emissions from the first sub-chamber 401 to be discharged from the second collection chamber 131 to the outside of the battery device 100. The second sub-chamber 402 communicates with the third collection chamber 141 via the fourth vent 142, allowing emissions from the second sub-chamber 402 to be discharged from the third collection chamber 141 to the outside of the battery device 100. Meanwhile, the first sub-chamber 401 is not in communication with the third collection chamber 141, and the second sub-chamber 402 is not in communication with the second collection chamber 131.

[0232] Along the first direction x, a third thermal insulation pad 16 is arranged between the first battery cell group 20 and the first end plate 13, a fourth thermal insulation pad 17 is arranged between the first battery cell group 20 and the second end plate 14, a fifth thermal insulation pad 18 is arranged between the second battery cell group 30 and the first end plate 13, and a sixth thermal insulation pad 19 is arranged between the second battery cell group 30 and the second end plate 14.

[0233] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A first battery cell group, comprising a plurality of first battery cells arranged along a first direction; A second battery cell group, comprising a plurality of second battery cells arranged along the first direction, wherein the first battery cell group and the second battery cell group are arranged along a second direction, and the second direction intersects the first direction; a separation beam, disposed between the first battery cell group and the second battery cell group; A first pressure relief mechanism is provided on a side of the first battery cell facing the partition beam, and a second pressure relief mechanism is provided on a side of the second battery cell facing the partition beam. A first collecting chamber is provided inside the partition beam. The first collecting chamber is used to collect emissions from the first battery cell when the first pressure relief mechanism is actuated, and is used to collect emissions from the second battery cell when the second pressure relief mechanism is actuated. In the same projection plane perpendicular to the second direction, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism do not overlap.

2. The battery device according to claim 1, wherein: The first battery cell has a first surface facing the partition beam, and the first pressure relief mechanism is eccentrically disposed on the first surface.

3. The battery device according to claim 1, wherein: The second battery cell has a second surface facing the partition beam, and the second pressure relief mechanism is eccentrically disposed on the second surface.

4. The battery device according to claim 1, wherein: The first battery cell and the second battery cell have the same structure; Each of the first battery cells is arranged to be rotated 180 degrees relative to the second battery cell opposite to the first battery cell.

5. The battery device according to claim 4, characterized in that In the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a first direction; and / or, in the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a third direction; The third direction and the second direction are perpendicular to the first direction in pairs.

6. The battery device according to claim 4, characterized in that Among two adjacent first battery cells, one of the first battery cells is arranged to be rotated 180 degrees relative to the other first battery cell; Among two adjacent second battery cells, one of the second battery cells is arranged to be rotated 180 degrees relative to the other second battery cell.

7. The battery device according to claim 1, wherein: The first battery cell and the second battery cell have different structures; In the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a first direction; And / or, within the projection plane, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered along a third direction; The third direction and the second direction are perpendicular to the first direction in pairs.

8. The battery device according to claim 1, wherein: A first vent hole communicating with the first collecting chamber is provided on a side of the partition beam facing the first battery cell, and the first vent hole corresponds to the position of the first pressure relief mechanism; A second vent hole communicating with the first collecting chamber is provided on a side of the separation beam facing the second battery cell, and the second vent hole corresponds to a position of the second pressure relief mechanism.

9. The battery device according to claim 8, characterized in that In the projection plane, the orthographic projection of the first vent hole covers the orthographic projection of the first pressure relief mechanism.

10. The battery device according to claim 8, characterized in that The battery device further includes a first thermal insulation pad, which is disposed between the partition beam and the first battery cell group. The first thermal insulation pad is provided with a first avoidance hole, which is communicated with the first vent hole.

11. The battery device according to claim 10, characterized in that In the projection plane, the orthographic projection of the first avoidance hole covers the orthographic projection of the first ventilation hole.

12. The battery device according to claim 8, wherein: In the projection plane, the orthographic projection of the second vent hole covers the orthographic projection of the second pressure relief mechanism.

13. The battery device according to claim 8, characterized in that The battery device further includes a second thermal insulation pad, which is disposed between the partition beam and the second battery cell group. The second thermal insulation pad is provided with a second avoidance hole, which is communicated with the second vent hole.

14. The battery device according to claim 13, wherein: In the projection plane, the orthographic projection of the second avoidance hole covers the orthographic projection of the second ventilation hole.

15. The battery device according to any one of claims 1 to 14, characterized in that: The partition beam includes a beam body and a partition, the beam body is provided with the first collecting cavity, the partition is provided in the first collecting cavity and divides the first collecting cavity into a first sub-cavity and a second sub-cavity that are not communicated with each other; The first sub-chamber is used to collect emissions from one of the first battery cell and the second battery cell opposite to each other along the second direction, and the second sub-chamber is used to collect emissions from the other of the first battery cell and the second battery cell opposite to each other along the second direction.

16. The battery device according to claim 15, characterized in that The beam body comprises a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate being close to the first battery cell, the second side plate being close to the second battery cell, the third side plate and the fourth side plate being arranged opposite to each other along a third direction, and the third side plate and the fourth side plate being connected between the first side plate and the second side plate respectively; the third direction and the second direction are perpendicular to the first direction in pairs; The partition is connected between the first side panel and the second side panel; The first sub-cavity is formed between the first side plate, the second side plate, the third side plate and the partition, and the second sub-cavity is formed between the first side plate, the second side plate, the fourth side plate and the partition.

17. The battery device according to claim 15, characterized in that The beam body and the partition are integrally formed.

18. The battery device according to claim 15, wherein: The battery device further includes a box body, the box body including a first end plate and a second end plate, the first end plate and the second end plate are spaced apart along the first direction, the first battery cell group and the second battery cell group are disposed between the first end plate and the second end plate, and the partition beam is connected between the first end plate and the second end plate; A second collecting chamber is provided in the first end plate, and a third collecting chamber is provided in the second end plate; The first sub-chamber is communicated with the second collecting chamber, and the second sub-chamber is communicated with the third collecting chamber.

19. The battery device according to claim 18, wherein: The box body further includes a bottom plate, the bottom plate supports the first battery cell group and the second battery cell group, and the partition beam, the first end plate and the second end plate are all connected to the bottom plate.

20. The battery device according to claim 18, wherein: The first end plate is further provided with a third vent hole communicating with the second collecting chamber, and the first sub-chamber is communicated with the third vent hole; The second end plate is further provided with a fourth vent hole communicating with the third collecting chamber, and the second sub-chamber is communicated with the fourth vent hole.

21. An energy storage device, characterized in that: A battery device comprising the battery device according to any one of claims 1 to 20.

22. An energy storage system, characterized in that: It comprises an energy storage and flow conversion device and the energy storage device as claimed in claim 21, wherein the energy storage and flow conversion device is used to electrically connect a power generation device and the energy storage device.

23. A charging network, characterized in that: It comprises a charging pile and an energy storage device as claimed in claim 21, wherein the energy storage device is used to provide electrical energy to the charging pile.

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