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 monomer group; a second battery cell group; the separation beam is arranged between the first battery monomer group and the second battery monomer group; the first heat insulation pad is arranged between the separation beam and the first battery monomer group; the second heat insulation pad is arranged between the separation beam and the second battery monomer group; wherein a first battery monomer of the first battery monomer group is provided with a first pressure relief mechanism, a second battery monomer of the second battery monomer group is provided with a second pressure relief mechanism, and the separation beam is provided with a collection cavity; a first strength weak area corresponding to the first pressure relief mechanism in position is arranged on the side, facing the first heat insulation pad, of the separation beam or the first heat insulation pad. The side, facing the second heat insulation pad, of the separation beam or the second heat insulation pad is provided with a second strength weak area corresponding to the second pressure relief mechanism in position, so that thermal runaway diffusion is avoided.

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 prevent the spread of thermal runaway and thereby improve 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 thermal insulation pad, disposed between the separation beam and the first battery cell group;

[0010] a second thermal insulation pad, disposed between the separation beam and the second battery cell group;

[0011] 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 collection chamber is provided inside the partition beam, and the collection 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.

[0012] A first weak strength area is provided on the side of the partition beam facing the first thermal insulation pad or on the first thermal insulation pad, and the first weak strength area corresponds to the position of the first pressure relief mechanism; a second weak strength area is provided on the side of the partition beam facing the second thermal insulation pad or on the second thermal insulation pad, and the second weak strength area corresponds to the position of the second pressure relief mechanism.

[0013] In the technical solution of the embodiment of the present application, a first weak zone and a second weak zone are provided, and the first weak zone is positioned opposite the first pressure relief mechanism, while the second weak zone is positioned opposite the second pressure relief mechanism. When a battery cell experiences thermal runaway, the weak zone corresponding to the runaway cell will form a discharge channel for emissions after the pressure relief mechanism is activated. This allows emissions from the runaway cell to enter the collection cavity of the partition beam through the corresponding weak zone, making it difficult for them to reach the area where the non-runaway cell is located. This prevents the thermal runaway from spreading to other cells. It also prevents emissions from entering the area where other cells are located, causing a short circuit, thereby preventing the battery device from igniting emissions due to a short circuit.

[0014] In an optional embodiment, in a first projection plane perpendicular to the second direction, the orthographic projection of the first weak strength area covers the orthographic projection of the first pressure relief mechanism.

[0015] By making the orthographic projection of the first strength weak area in the first projection plane cover the orthographic projection of the first pressure relief mechanism in the first projection plane, the side of the first pressure relief mechanism facing the partition beam is unobstructed, which is conducive to the rapid opening of the first pressure relief mechanism. At the same time, it can prevent the first pressure relief mechanism from being blocked by the first thermal insulation pad when actuated and unable to open or unable to open completely.

[0016] In an optional embodiment, in a second projection plane perpendicular to the second direction, the orthographic projection of the second weak strength area covers the orthographic projection of the second pressure relief mechanism.

[0017] By making the orthographic projection of the second weak strength area in the second projection plane cover the orthographic projection of the second pressure relief mechanism in the second projection plane, the side of the second pressure relief mechanism facing the partition beam is unobstructed, which is conducive to the rapid opening of the second pressure relief mechanism. At the same time, it can avoid the second pressure relief mechanism being blocked by the second thermal insulation pad when actuated and unable to open or unable to open completely.

[0018] In an optional embodiment, a first vent hole communicating with the 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;

[0019] And / or, a second vent hole communicating with the 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.

[0020] By providing a first vent hole on the side of the separator beam facing the first battery cell, when the first pressure relief mechanism is activated, the exhaust from the first battery cell can be directly discharged into the collection chamber through the first vent hole. Similarly, by providing a second vent hole on the side of the separator beam facing the second battery cell, when the second pressure relief mechanism is activated, the exhaust from the second battery cell can be directly discharged into the collection chamber through the second vent hole.

[0021] In an optional embodiment, the first weak strength area includes a first notch provided on a side of the first thermal insulation pad facing the partition beam.

[0022] When the first weak zone is configured as a first notch provided on the side of the first thermal insulation pad facing the partition beam, the first weak zone is easily broken when the unnotched surface (the surface of the first weak zone facing away from the partition beam) is subjected to air pressure shock, but is not easy to break when the notched surface (the surface of the first weak zone facing the partition beam with the first notch) is subjected to air pressure shock. When the first battery cell thermally runs away, the high-temperature and high-pressure gas ejected from the first battery cell can quickly break through the first weak zone adjacent to it from the unnotched surface, so that the discharge quickly enters the collection cavity of the partition beam.

[0023] In an optional embodiment, the first strength weakened area includes a first thickness weakened area provided on the first thermal insulation pad.

[0024] By configuring the first strength weak area as the first thickness weak area, the first strength weak area close to the first battery cell in thermal runaway is easily broken, so that the discharge of the first battery cell can quickly enter the collection cavity of the separation beam.

[0025] In an optional embodiment, the first thickness weakened area includes a first groove that is recessed relative to the surface of the first thermal insulation pad.

[0026] A first relatively concave groove is provided on the surface of the first thermal insulation pad to form a first thickness weak area.

[0027] In an optional embodiment, the first weak strength area includes a first avoidance hole provided on the first thermal insulation pad, and the first avoidance hole corresponds to the position of the first pressure relief mechanism.

[0028] For the first battery cell, which releases low energy during thermal runaway, a first avoidance hole can be provided on the first thermal insulation pad at a position corresponding to the first pressure relief mechanism. This first avoidance hole allows the first pressure relief mechanism to open unimpeded, ensuring that the first pressure relief mechanism opens quickly and discharges the exhaust into the collection chamber. At the same time, because the energy released by the first battery cell is relatively low, by the time the exhaust from the first battery cell passes through the collection chamber and is sprayed onto the second thermal insulation pad on the opposite side, the energy has decayed to a point where it is unlikely to cause damage to the second battery cell on the opposite side. This solution of directly providing the first avoidance hole on the first thermal insulation pad saves manufacturing costs compared to making notches or local thinning.

[0029] In an optional embodiment, the first weak strength area further includes a first hot melt component, and the first hot melt component covers the first avoidance hole or the first ventilation hole.

[0030] By covering the first escape hole or the first vent hole with the first heat-melt component, the first heat-melt component can be broken when the temperature or pressure exceeds the tolerance value, and remain intact when the temperature or pressure falls below the tolerance value. When the first battery cell experiences thermal runaway, the high-temperature and high-pressure gas ejected from the first battery cell can quickly break the adjacent first heat-melt component, allowing the discharged gas to quickly enter the collection cavity of the partition beam.

[0031] In an optional embodiment, in a first projection plane perpendicular to the second direction, the orthographic projection of the first avoidance hole covers the orthographic projection of the first pressure relief mechanism.

[0032] By making the orthographic projection of the first avoidance hole in the first projection plane cover the orthographic projection of the first pressure relief mechanism in the first projection plane, the first pressure relief mechanism can be opened 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.

[0033] In an optional embodiment, the second weak zone includes a second notch provided on a side of the second thermal insulation pad facing the partition beam.

[0034] When the second weak zone is configured as a second notch provided on the side of the second thermal insulation pad facing the partition beam, the second weak zone is easily broken when the unnotched surface (the surface of the second weak zone facing away from the partition beam) is subjected to air pressure shock, but is not easy to break when the notched surface (the surface of the second weak zone facing the partition beam with the second notch) is subjected to air pressure shock. When the second battery cell thermally runs away, the high-temperature and high-pressure gas ejected from the second battery cell can quickly break through the second weak zone adjacent to the unnotched surface, so that the discharge quickly enters the collection cavity of the partition beam.

[0035] In an optional embodiment, the second strength weakened area includes a second thickness weakened area provided on the second thermal insulation pad.

[0036] By configuring the second weak strength area as the second weak thickness area, the second weak strength area close to the second battery cell in thermal runaway is easily broken, so that the discharge of the second battery cell can quickly enter the collection cavity of the separation beam.

[0037] In an optional embodiment, the second thickness weakened area includes a second groove that is recessed relative to the surface of the second thermal insulation pad.

[0038] A second relatively concave groove is provided on the surface of the second thermal insulation pad to form a second thickness weak area.

[0039] In an optional embodiment, the second weak strength area includes a second avoidance hole provided on the second thermal insulation pad, and the second avoidance hole corresponds to the position of the second pressure relief mechanism.

[0040] For the second battery cell, which releases less energy during thermal runaway, a second avoidance hole can be provided on the second thermal insulation pad at the location corresponding to the second pressure relief mechanism. This second avoidance hole allows the second pressure relief mechanism to open unimpeded, ensuring that the second pressure relief mechanism opens quickly and discharges the exhaust into the collection chamber. At the same time, because the energy released by the second battery cell is relatively low, by the time the exhaust from the second battery cell passes through the collection chamber and sprays onto the first thermal insulation pad on the opposite side, the energy has decayed to a point where it is unlikely to cause damage to the first battery cell on the opposite side. This solution of directly providing a second avoidance hole on the second thermal insulation pad saves manufacturing costs compared to making notches or local thinning.

[0041] In an optional embodiment, the second weak zone further includes a second hot melt component, and the second hot melt component covers the second avoidance hole or the second ventilation hole.

[0042] By covering the second escape hole or second vent with a second hot melt member, the second hot melt member can break when the temperature or pressure exceeds the tolerance value, and remain intact when the temperature or pressure falls below the tolerance value. If the second battery cell experiences thermal runaway, the high-temperature, high-pressure gas ejected from the second battery cell can quickly break the adjacent second hot melt member, allowing the discharged gas to quickly enter the collection cavity of the partition beam.

[0043] In an optional embodiment, in a second projection plane perpendicular to the second direction, the orthographic projection of the second avoidance hole covers the orthographic projection of the second pressure relief mechanism.

[0044] By making the orthographic projection of the second avoidance hole in the second projection plane cover the orthographic projection of the second pressure relief mechanism in the second 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.

[0045] In an optional embodiment, in a first projection plane perpendicular to the second direction, the orthographic projection of the first vent hole covers the orthographic projection of the first pressure relief mechanism.

[0046] By making the orthographic projection of the first vent hole in the first projection plane cover the orthographic projection of the first pressure relief mechanism in the first 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 fully open 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 first battery cell from rupturing or exploding due to the inability to quickly release the internal pressure of the first battery cell; on the other hand, it can also avoid the metal structure of the first pressure relief mechanism contacting the outer shell and the partition beam of the first battery cell at the same time when the first pressure relief mechanism is actuated.

[0047] In an optional embodiment, in a second projection plane perpendicular to the second direction, the orthographic projection of the second vent hole covers the orthographic projection of the second pressure relief mechanism.

[0048] By making the orthographic projection of the second vent hole in the second projection plane cover the orthographic projection of the second pressure relief mechanism in the second 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.

[0049] In an optional embodiment, a plurality of first weak areas are provided, and the first pressure relief mechanisms of the plurality of first battery cells are provided in one-to-one correspondence with the plurality of first weak areas; and / or,

[0050] There are multiple second weak areas, and the second pressure relief mechanisms of the multiple second battery cells are arranged in a one-to-one correspondence with the multiple second weak areas.

[0051] The first pressure relief mechanisms of the plurality of first battery cells are disposed in a one-to-one correspondence with the plurality of first weak areas, so that exhaust from each first battery cell can be discharged one-to-one. Similarly, the second pressure relief mechanisms of the plurality of second battery cells are disposed in a one-to-one correspondence with the plurality of second weak areas, so that exhaust from each second battery cell can be discharged one-to-one.

[0052] In an optional embodiment, the battery device also includes a box body, which includes a thermal management component, a first end plate and a second end plate, the partition beam, the first end plate and the second end plate are all connected to the thermal management component, 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 arranged 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] By connecting the partition beam, the first end plate and the second end plate to the thermal management component, and arranging the first battery cell group and the second battery cell group between the first end plate and the second end plate, the thermal management component can support the first battery cell group and the second battery cell group, and can also cool the first battery cell group and the second battery cell group.

[0054] In a second aspect, the present application provides an energy storage device, which includes the battery device in the above embodiment.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] 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:

[0062] Figure 1 This is a schematic diagram of the structure of a charging network in some embodiments of the present application;

[0063] Figure 2 A schematic diagram of the structure of an energy storage system in some embodiments of the present application;

[0064] Figure 3 Schematic diagram of the structure of the energy storage device in some embodiments of the present application;

[0065] Figure 4 Schematic diagram of the exploded structure of a battery device in some embodiments of the present application;

[0066] Figure 5 is a schematic structural diagram of another battery device in some embodiments of the present application;

[0067] Figure 6 This is a schematic diagram of the exploded structure of a first battery cell in some embodiments of the present application;

[0068] Figure 7 for Figure 5 Schematic diagram of the decomposition structure;

[0069] Figure 8 for Figure 7 Schematic diagram of the assembly of the partition beam, the first end plate, the second end plate, the thermal management component, the first thermal insulation pad and the second thermal insulation pad;

[0070] Figure 9 for Figure 8 Schematic diagram of the decomposition structure;

[0071] Figure 10 for Figure 8 Cross-sectional view at AA in the middle;

[0072] Figure 11 for Figure 10 A magnified schematic diagram of point A in the middle;

[0073] Figure 12for Figure 8 A first structural schematic diagram of the first thermal insulation pad;

[0074] Figure 13 for Figure 12 A structural diagram from another angle;

[0075] Figure 14 This is a second structural schematic diagram of the first thermal insulation pad in some embodiments of the present application;

[0076] Figure 15 This is a third structural schematic diagram of the first thermal insulation pad in some embodiments of the present application;

[0077] Figure 16 for Figure 15 An enlarged schematic cross-sectional view at a first thickness weak zone;

[0078] Figure 17 Schematic diagram of the assembly of the first thermal insulation pad and the first hot melt member in some embodiments of the present application;

[0079] Figure 18 for Figure 17 Schematic diagram of the decomposition structure;

[0080] Figure 19 Another schematic diagram of assembling the first thermal insulation pad and the first hot melt member in some embodiments of the present application;

[0081] Figure 20 for Figure 19 Schematic diagram of the decomposition structure;

[0082] Figure 21 Another exploded structural diagram of the partition beam, the first end plate, the second end plate, the thermal management component, the first thermal insulation pad, and the second thermal insulation pad in some embodiments of the present application;

[0083] Figure 22 Schematic diagram of the exploded structure of the partition beam, the first end plate, the second end plate, the thermal management component, the first thermal insulation pad, the second thermal insulation pad, and the first hot melt in some embodiments of the present application;

[0084] Figure 23 This is another exploded structural schematic diagram of the partition beam, first end plate, second end plate, thermal management component, first thermal insulation pad, second thermal insulation pad and first hot melt in some embodiments of the present application.

[0085] The accompanying drawings in the specific implementation manner are as follows:

[0086] 1000, charging network; 2000, energy storage system; 3000, power generation device;

[0087] 100. Battery device;

[0088] 10. Box; 11. First part; 12. Second part; 13. First end plate; 14. Second end plate; 15. Thermal management component; 16. Third thermal insulation pad; 17. Fourth thermal insulation pad; 18. Fifth thermal insulation pad; 19. Sixth thermal insulation pad;

[0089] 20. First battery cell group; 21. First battery cell; 211. Outer shell; 2111. End cover; 2112. Housing; 212. Cell assembly; 213. Post;

[0090] 30. Second battery cell group; 31. Second battery cell; 311. Second pressure relief mechanism;

[0091] 40. Separating beam; 41. Collecting chamber; 42. First vent hole; 43. Second vent hole;

[0092] 50, first thermal insulation pad; 50a, scored surface; 50b, unscored surface; 51, first scored surface; 52, first thickness weakened area; 521, first groove; 53, first avoidance hole;

[0093] 60. Second thermal insulation pad; 61. Second notch; 62. Second avoidance hole;

[0094] 70. First hot melt member;

[0095] W1, the first weak zone; W2, the second weak zone;

[0096] 200. Energy storage device; 210. Energy storage box;

[0097] 300, charging pile;

[0098] 400. Energy storage and current conversion device;

[0099] x, first direction; y, second direction; z, third direction. DETAILED DESCRIPTION

[0100] 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.

[0101] 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.

[0102] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0103] 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.

[0104] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0105] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies to provide voltage and capacity.

[0106] 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.

[0107] In a battery device with two rows of battery cells, the battery cells in the same row constitute a battery cell group. To ensure 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] In order to reduce the possibility of emissions released by battery cells during thermal runaway being sprayed onto the battery cells on the opposite side, research has found that a weak strength area can be provided on the side of the partition beam facing each insulation pad or on each insulation pad, so that after thermal runaway of the battery cell occurs, the emissions sprayed by the pressure relief mechanism can quickly enter the partition beam through the weak strength area, and have difficulty entering the area where the battery cells are located, thereby avoiding the spread of thermal runaway and improving the reliability of the power battery device.

[0113] Based on the above considerations, and to address the issue of emissions released from battery cells experiencing thermal runaway spraying onto opposing battery cells, a battery device has been designed. This device features a first weak zone and a second weak zone, with the first weak zone positioned directly opposite the first pressure relief mechanism, and the second weak zone positioned directly opposite the second pressure relief mechanism. When a battery cell experiences thermal runaway, the weak zone corresponding to the runaway cell forms a channel for the emissions after the pressure relief mechanism is activated. This allows emissions from the runaway cell to enter the collection chamber of the separator beam through the corresponding weak zone, making it difficult for them to reach the area of ​​the remaining runaway cells. This prevents thermal runaway from spreading to other cells. It also prevents emissions from entering the area of ​​other cells and causing short circuits, thus preventing the emissions from igniting the emissions and potentially igniting a fire in the battery device.

[0114] 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.

[0115] The battery device 100 is described below with reference to the accompanying drawings.

[0116] 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.

[0117] 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.

[0118] 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 .

[0119] 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 .

[0120] 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 .

[0121] 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.

[0122] 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.

[0123] As an example, Figure 2 As 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.

[0124] Please refer to Figure 3 The energy storage device 200 includes an energy storage box 210 , in which the battery device 100 is disposed.

[0125] As an example, the energy storage device 200 may be an energy storage container, an energy storage cabinet, etc.

[0126] 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.

[0127] According to some embodiments of this application, please refer to Figures 4 to 11 , 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 7 Schematic diagram of the assembly of the partition beam 40, the first end plate 13, the second end plate 14, the thermal management component 15, the first thermal insulation pad 50 and the second thermal insulation pad 60, Figure 9 for Figure 8 Schematic diagram of the decomposition structure, Figure 10 for Figure 8 The cross-sectional view at AA in the middle, Figure 11 for Figure 10 Enlarged schematic diagram of point A in the middle.

[0128] The present application provides a battery device 100, including a first battery cell group 20, a second battery cell group 30, a separator beam 40, a first thermal insulation pad 50, and a second thermal insulation pad 60. The first battery cell group 20 includes a plurality of first battery cells 21 arranged along a first direction x, and 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, which intersects the first direction x.

[0129] The partition beam 40 is disposed between the first battery cell group 20 and the second battery cell group 30 . The first thermal insulation pad 50 is disposed between the partition beam 40 and the first battery cell group 20 . The second thermal insulation pad 60 is disposed between the partition beam 40 and the second battery cell group 30 .

[0130] Among them, a first pressure relief mechanism 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 collecting chamber 41 is provided inside the partition beam 40. The collecting chamber 41 is used to collect the emissions of the first battery cell 21 when the first pressure relief mechanism is actuated, and to collect the emissions of the second battery cell 31 when the second pressure relief mechanism 311 is actuated.

[0131] A first weak zone W1 is provided on the side of the partition beam 40 facing the first thermal insulation pad 50, or on the first thermal insulation pad 50. This first weak zone W1 corresponds to the location of the first pressure relief mechanism. A second weak zone W2 is provided on the side of the partition beam 40 facing the second thermal insulation pad 60, or on the second thermal insulation pad 60. This second weak zone W2 corresponds to the location of the second pressure relief mechanism 311.

[0132] 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.

[0133] 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.

[0134] 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 includes a housing 211 , a battery cell assembly 212 and other functional components.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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. Alternatively, 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. The third direction z may be parallel to the thickness direction of the battery device 100.

[0139] The pressure relief mechanism (including the first pressure relief mechanism 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.

[0140] The pressure relief mechanism may be an explosion-proof valve, specifically an explosion-proof disk.

[0141] The first thermal insulation pad 50 can be a thin plate with high temperature resistance and heat insulation function, such as an epoxy board or a mica sheet. The first thermal insulation pad 50 is used to prevent the heat generated by the first battery cell 21 in thermal runaway from being transferred to other battery cells through the partition beam 40, causing heat diffusion. It can also prevent the heat of the emissions discharged into the collection chamber 41 from being transferred to other battery cells through the partition beam 40, causing heat diffusion.

[0142] The second thermal insulation pad 60 can be a thin plate with high temperature resistance and heat insulation function, such as an epoxy board or a mica sheet. The second thermal insulation pad 60 is used to prevent the heat generated by the second battery cell 31 in thermal runaway from being transferred to other battery cells through the partition beam 40, causing heat diffusion. It can also prevent the heat of the emissions discharged into the collection chamber 41 from being transferred to other battery cells through the partition beam 40, causing heat diffusion.

[0143] 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.

[0144] In the technical solution of the embodiment of the present application, a first weak zone W1 is provided on the side of the partition beam 40 facing the first thermal insulation pad 50 or on the first thermal insulation pad 50, and the first weak zone W1 is positioned opposite the first pressure relief mechanism. At this time, the first weak zone W1 is located between the first pressure relief mechanism and the collecting chamber 41. When the first battery cell 21 thermally runs away, the first weak zone W1 will form a discharge channel for the emissions after the first pressure relief mechanism is actuated, so that the emissions of the first battery cell 21 enter the collecting chamber 41 of the partition beam 40 from the first weak zone W1, and it is difficult to reach the area where the battery cell that has not run away is located, thereby avoiding the thermal runaway from spreading to other battery cells. At the same time, it can also prevent the emissions from entering the area where other battery cells are located to cause a short circuit, thereby avoiding the battery device 100 catching fire due to the ignition of the emissions due to the short circuit. Similarly, a second weak zone W2 is provided on the side of the partition beam 40 facing the second thermal insulation pad 60 or on the second thermal insulation pad 60, and the second weak zone W2 is positioned opposite the second pressure relief mechanism 311. At this time, the second weak zone W2 is located between the second pressure relief mechanism 311 and the collecting chamber 41. When the second battery cell 31 thermally runs away, the second weak zone W2 will form a discharge channel for the emissions after the second pressure relief mechanism 311 is actuated, so that the emissions of the second battery cell 31 enter the collecting chamber 41 of the partition beam 40 from the second weak zone W2, and it is difficult to reach the area where the battery cell that has not run away is located, thereby avoiding the thermal runaway from spreading to other battery cells. At the same time, it can also prevent the emissions from entering the area where other battery cells are located and causing a short circuit, thereby avoiding the battery device 100 catching fire due to the ignition of the emissions due to the short circuit.

[0145] According to some embodiments of the present application, in a first projection plane perpendicular to the second direction y, the orthographic projection of the first weak area W1 covers the orthographic projection of the first pressure relief mechanism.

[0146] By ensuring that the orthographic projection of the first weak zone W1 within the first projection plane overlaps the orthographic projection of the first pressure relief mechanism within the first projection plane, the side of the first pressure relief mechanism facing the partition beam 40 is unobstructed, facilitating rapid opening of the first pressure relief mechanism. This also prevents the first pressure relief mechanism from being blocked by the first thermal insulation pad 50 during actuation, preventing it from being unable to open or fully open. Failure to fully open the first pressure relief mechanism will result in an inability to vent air or obstructed venting, which could result in the inability to quickly release the internal pressure of the first battery cell 21, leading to a rupture or explosion of the housing.

[0147] According to some embodiments of the present application, in a second projection plane perpendicular to the second direction y, the orthographic projection of the second weak area W2 covers the orthographic projection of the second pressure relief mechanism 311 .

[0148] By ensuring that the orthographic projection of the second weak zone W2 within the second projection plane overlaps the orthographic projection of the second pressure relief mechanism 311 within the second projection plane, the side of the second pressure relief mechanism 311 facing the partition beam 40 is unobstructed, facilitating rapid opening of the second pressure relief mechanism 311. This also prevents the second pressure relief mechanism 311 from being blocked by the second thermal insulation pad 60 during actuation, preventing it from being unable to open or fully open. Failure to fully open the second pressure relief mechanism 311 can result in venting or poor ventilation, potentially preventing the second battery cell 31 from rapidly releasing internal pressure, leading to a rupture or explosion of the housing.

[0149] According to some embodiments of the present application, referring to Figure 11 A first vent hole 42 communicating with the collection chamber 41 is provided on the side of the partition beam 40 facing the first battery cell 21. The first vent hole 42 corresponds to the position of the first pressure relief mechanism. And / or, a second vent hole 43 communicating with the collection chamber 41 is provided on the side of the partition beam 40 facing the second battery cell 31. The second vent hole 43 corresponds to the position of the second pressure relief mechanism 311.

[0150] By providing a first vent hole 42 on the side of the separation beam 40 facing the first battery cell 21, when the first pressure relief mechanism is activated, the exhaust from the first battery cell 21 can be directly discharged into the collection chamber 41 through the first vent hole 42. Similarly, by providing a second vent hole 43 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 collection chamber 41 through the second vent hole 43.

[0151] According to some embodiments of the present application, referring to Figure 11 , and refer to Figure 12-Figure 20 、 Figure 22-23 , Figure 12 for Figure 8 A first structural diagram of the first thermal insulation pad 50 is shown in FIG. Figure 13 for Figure 12 A structural diagram from another angle, Figure 14 This is a second structural diagram of the first thermal insulation pad 50 in some embodiments of the present application. Figure 15 This is a third structural diagram of the first thermal insulation pad 50 in some embodiments of the present application. Figure 16 for Figure 15 An enlarged schematic cross-sectional view of the first thickness weak zone 52, Figure 17 This is a schematic diagram of the assembly of the first thermal insulation pad 50 and the first hot melt member 70 in some embodiments of the present application. Figure 18 for Figure 17 Schematic diagram of the decomposition structure, Figure 19 This is another assembly diagram of the first thermal insulation pad 50 and the first hot melt member 70 in some embodiments of the present application. Figure 20 for Figure 19 Schematic diagram of the decomposition structure, Figure 22 Schematic diagram of the exploded structure of the partition beam 40, the first end plate 13, the second end plate 14, the thermal management component 15, the first thermal insulation pad 50, the second thermal insulation pad 60 and the first hot melt 70 in some embodiments of the present application. Figure 23 This is another exploded structural diagram of the separator beam 40, first end plate 13, second end plate 14, thermal management component 15, first thermal insulation pad 50, second thermal insulation pad 60, and first heat-seal member 70 in some embodiments of the present application. The first weak area W1 can be configured to rupture under force when the first pressure relief mechanism is actuated, thereby releasing the discharged matter from the first battery cell 21. The second weak area W2 can be configured to rupture under force when the first pressure relief mechanism is actuated, thereby releasing the discharged matter from the second battery cell 31.

[0152] According to some embodiments of the present application, referring to Figure 11-14 The first weak zone W1 includes a first notch 51 provided on a side of the first thermal insulation pad 50 facing the partition beam 40 .

[0153] The shape and size of the first notch 51 can be determined according to the shape and size of the first pressure relief mechanism of the first battery cell 21. Figure 12 The first notch 51 includes a ">"-shaped notch, a "<"-shaped notch and a "I"-shaped notch, and the "I"-shaped notch is connected to the bending part of the ">"-shaped notch and the bending part of the "<"-shaped notch; Figure 14 , the first notch 51 is in an “X” shape.

[0154] The depth of the first notch 51 is determined by the thickness of the first thermal insulation pad 50 and the energy of the discharge when the first battery cell 21 thermally runs away. It is necessary to ensure that the first notch 51 can be quickly opened when the first battery cell 21 that is closely adjacent to it thermally runs away, and the discharge ejected when the second battery cell 31 on the opposite side thermally runs away will be sprayed onto the first thermal insulation pad 50 and cannot break the first notch 51.

[0155] When the first weak zone W1 is configured as a first notch 51 provided on the side of the first thermal insulation pad 50 facing the partition beam 40, the first weak zone W1 is easily broken when the unnotched surface 50b (the surface of the first weak zone W1 facing away from the partition beam 40) is subjected to air pressure shock, and is not easy to break when the notched surface 50a (the surface of the first weak zone W1 facing the partition beam 40 with the first notch 51) is subjected to air pressure shock. When the first battery cell 21 thermally runs away, the high-temperature and high-pressure gas ejected from the first battery cell 21 can quickly break the first weak zone W1 adjacent to it from the unnotched surface 50b, so that the discharge quickly enters the collection cavity 41 of the partition beam 40.

[0156] According to some embodiments of the present application, referring to Figure 15-16 The first strength weak area W1 includes a first thickness weak area 52 provided on the first thermal insulation pad 50 .

[0157] The first thickness weak area 52 can be made by local thinning. The first thickness weak area 52 can be made by thinning the first thermal insulation pad 50 on one side (refer to Figure 15 ), double-sided thinning is also possible.

[0158] By configuring the first strength weak area W1 as the first thickness weak area 52 , the first strength weak area W1 close to the first battery cell 21 in thermal runaway is easily broken, so that the discharge of the first battery cell 21 can quickly enter the collecting cavity 41 of the partition beam 40 .

[0159] According to some embodiments of the present application, referring to Figure 16 The first thickness weakened area 52 includes a first groove 521 that is recessed relative to the surface of the first thermal insulation pad 50. The first groove 521 is recessed relative to the side of the first thermal insulation pad 50 that faces the partition beam 40, and / or the first groove 521 is recessed relative to the side of the first thermal insulation pad 50 that faces the first battery cell 21.

[0160] For example, referring to Figure 15The first groove 521 is recessed only relative to the side of the first thermal insulation pad 50 facing the partition beam 40. In other embodiments, the first groove 521 may be recessed only relative to the side of the first thermal insulation pad 50 facing the first battery cell 21; or the first groove 521 may be recessed simultaneously relative to the side of the first thermal insulation pad 50 facing the partition beam 40 and the side of the first thermal insulation pad 50 facing the first battery cell 21.

[0161] A relatively concave first groove 521 is provided on the surface of the first thermal insulation pad 50 to form a first thickness weakened area 52 .

[0162] According to some embodiments of the present application, referring to Figure 21 , Figure 21 This is another decomposed structural schematic diagram of the partition beam 40, the first end plate 13, the second end plate 14, the thermal management component 15, the first thermal insulation pad 50 and the second thermal insulation pad 60 in some embodiments of the present application. The first strength weak area W1 includes a first avoidance hole 53 provided in the first thermal insulation pad 50, and the first avoidance hole 53 corresponds to the position of the first pressure relief mechanism.

[0163] For the first battery cell 21, which releases low energy due to thermal runaway, a first avoidance hole 53 can be provided on the first thermal insulation pad 50 at a position corresponding to the first pressure relief mechanism, and the first avoidance hole 53 is not blocked. The first avoidance hole 53 allows the first pressure relief mechanism to be opened without obstruction, ensuring that the first pressure relief mechanism opens quickly and discharges the exhaust into the collection chamber 41. At the same time, since the energy released by the first battery cell 21 is relatively low, when the exhaust from the first battery cell 21 passes through the collection chamber 41 and is sprayed onto the second thermal insulation pad 60 on the opposite side, the energy has decayed to the point where it is difficult to cause damage to the second battery cell 31 on the opposite side. This solution of directly opening the first avoidance hole 53 on the first thermal insulation pad 50 saves manufacturing costs compared to making notches or local thinning.

[0164] According to some embodiments of the present application, referring to Figures 17-20 、 Figure 22-23 The first weak zone W1 further includes a first hot melt member 70, which covers the first avoidance hole 53 (refer to Figures 17-20 ), or the first hot melt member 70 covers the first vent hole 42 (refer to Figure 22-23 ).

[0165] The melting point of the first thermal melt member 70 is lower than the melting points of the partition beam 40 and the first thermal insulation pad 50 .

[0166] For example, when the first hot melt member 70 covers the first avoidance hole 53, a first hot melt member 70 may be respectively covered at each first avoidance hole 53 (refer to Figure 17-18 ), each first avoidance hole 53 may also cover the same first hot melt member 70 extending along the first direction x (refer to Figure 19-20 When the first hot melt member 70 covers the first vent hole 42, a first hot melt member 70 may be covered at each first vent hole 42 (refer to Figure 22 ), each first vent hole 42 may also be covered with the same first hot melt member 70 extending along the first direction x (refer to Figure 23 ).

[0167] By covering the first escape hole 53 or the first vent hole 42 with the first heat-melt member 70, the first heat-melt member 70 ruptures when the temperature or pressure exceeds the tolerance level, and remains intact when the temperature or pressure falls below the tolerance level. When a first battery cell 21 experiences thermal runaway, the high-temperature, high-pressure gas ejected from the first battery cell 21 can rapidly rupture the adjacent first heat-melt member 70, allowing the discharged gas to quickly enter the collection cavity 41 of the partition beam 40.

[0168] According to some embodiments of the present application, referring to Figure 21-23 In a first projection plane perpendicular to the second direction y, the orthographic projection of the first avoidance hole 53 overlaps the orthographic projection of the first pressure relief mechanism. Exemplarily, the shape of the first avoidance hole 53 matches the shape of the first pressure relief mechanism, and the cross-sectional area of ​​the first avoidance hole 53 is not less than the cross-sectional area of ​​the first pressure relief mechanism, such that the orthographic projection of the first avoidance hole 53 overlaps the orthographic projection of the first pressure relief mechanism.

[0169] By making the orthographic projection of the first avoidance hole 53 in the first projection plane cover the orthographic projection of the first pressure relief mechanism in the first 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 50 when actuated.

[0170] According to some embodiments of the present application, referring to Figure 7 、 Figure 11 The second weak zone W2 includes a second notch 61 provided on a side of the second thermal insulation pad 60 facing the partition beam 40 .

[0171] The shape and size of the second notch 61 may be determined according to the shape and size of the second pressure relief mechanism 311 of the second battery cell 31. For example, the shape of the second notch 61 may be the same as that of the first notch 51.

[0172] The depth of the second notch 61 is determined by the thickness of the second thermal insulation pad 60 and the energy of the discharge when the second battery cell 31 thermally runs away. It is necessary to ensure that the second notch 61 can be quickly opened when the second battery cell 31 adjacent to it thermally runs away, and the discharge ejected when the first battery cell 21 on the opposite side thermally runs away is sprayed onto the second thermal insulation pad 60 and cannot break the second notch 61.

[0173] When the second weak zone W2 is configured as a second notch 61 provided on the side of the second thermal insulation pad 60 facing the partition beam 40, the second weak zone W2 is easily broken when the unnotched surface (the surface of the second weak zone W2 facing away from the partition beam 40) is subjected to air pressure shock, and is not easy to break when the notched surface (the surface of the second weak zone W2 facing the partition beam 40 with the second notch 61) is subjected to air pressure shock. When the second battery cell 31 thermally runs away, the high-temperature and high-pressure gas ejected from the second battery cell 31 can quickly break the second weak zone W2 adjacent to it from the unnotched surface, so that the discharge quickly enters the collection cavity 41 of the partition beam 40.

[0174] According to some embodiments of the present application, referring to Figure 11 , when the first weak zone W1 is configured as a first notch 51 provided on the side of the first thermal insulation pad 50 facing the partition beam 40, and the second weak zone W2 is configured as a second notch 61 provided on the side of the second thermal insulation pad 60 facing the partition beam 40.

[0175] If the first battery cell 21 thermally runs away, the high-temperature and high-pressure gas ejected from the first battery cell 21 can quickly break through the first strength weak zone W1 adjacent to it from the unscored surface, allowing the exhaust to quickly enter the collecting chamber 41 of the partition beam 40. At the same time, if the high-temperature and high-pressure gas ejected from the first battery cell 21 is sprayed onto the second thermal insulation pad 60 on the opposite side through the collecting chamber 41, due to the weakening of the gas temperature and impact force, and the fact that the scored surface of the second strength weak zone W2 is not easy to break when subjected to the impact of gas pressure, the exhaust from the first battery cell 21 will find it difficult to break through the second thermal insulation pad 60, thereby making it difficult for the exhaust from the first battery cell 21 to be sprayed onto the second battery cell 31 on the opposite side, thereby preventing the second battery cell group 30 on the opposite side from being affected by thermal runaway.

[0176] If the second battery cell 31 thermally runs away, the high-temperature and high-pressure gas ejected from the second battery cell 31 can quickly break through the second strength weak zone W2 adjacent to it from the unscored surface, allowing the exhaust to quickly enter the collecting chamber 41 of the partition beam 40. At the same time, if the high-temperature and high-pressure gas ejected from the second battery cell 31 is sprayed onto the first thermal insulation pad 50 on the opposite side through the collecting chamber 41, due to the weakening of the gas temperature and impact force, and the fact that the scored surface of the first strength weak zone W1 is not easy to break when subjected to the impact of gas pressure, the exhaust from the second battery cell 31 will find it difficult to break through the first thermal insulation pad 50, thereby making it difficult for the exhaust from the second battery cell 31 to be sprayed onto the first battery cell 21 on the opposite side, thereby preventing the first battery cell group 20 on the opposite side from being affected by thermal runaway.

[0177] According to some embodiments of the present application, the second strength weak area W2 includes a second thickness weak area provided in the second thermal insulation pad 60 .

[0178] The second thickness weakened area can be made by local thinning. The second thickness weakened area can be made by thinning the second thermal insulation pad 60 on one side or on both sides.

[0179] By configuring the second weak zone W2 as a second weak zone, the second weak zone W2 close to the second battery cell 31 in thermal runaway is easily broken, so that the discharge from the second battery cell 31 can quickly enter the collecting cavity 41 of the partition beam 40 .

[0180] According to some embodiments of the present application, when the first strength weak zone W1 is configured as the first thickness weak zone 52, and the second strength weak zone W2 is configured as the second thickness weak zone: if the first battery cell 21 thermally runs away, the exhaust of the first battery cell 21 will quickly break through the adjacent first thickness weak zone 52, allowing the exhaust to quickly enter the collecting chamber 41 of the partition beam 40. At the same time, if the high-temperature and high-pressure gas ejected from the first battery cell 21 is sprayed to the second thermal insulation pad 60 on the opposite side through the collecting chamber 41, due to the weakening of energy, the exhaust of the first battery cell 21 is not easy to break through the second thermal insulation pad 60, thereby making it difficult for the exhaust of the first battery cell 21 to spray to the second battery cell 31 on the opposite side, thereby avoiding the second battery cell group 30 on the opposite side from being affected by thermal runaway. If the second battery cell 31 thermally runs away, the discharge from the second battery cell 31 will quickly break through the adjacent second thickness weak area, allowing the discharge to quickly enter the collecting chamber 41 of the partition beam 40. At the same time, if the high-temperature and high-pressure gas ejected from the second battery cell 31 is sprayed onto the first thermal insulation pad 50 on the opposite side through the collecting chamber 41, due to the weakening of energy, the discharge from the second battery cell 31 will not easily break through the first thermal insulation pad 50, thereby making it difficult for the discharge from the second battery cell 31 to spray onto the first battery cell 21 on the opposite side, thereby preventing the first battery cell group 20 on the opposite side from being affected by thermal runaway.

[0181] According to some embodiments of the present application, the second thickness weakened area includes a second groove that is recessed relative to the surface of the second thermal insulation pad 60. The second groove is recessed relative to the surface of the second thermal insulation pad 60 facing the partition beam 40, and / or the second groove is recessed relative to the surface of the second thermal insulation pad 60 facing the second battery cell 31.

[0182] Exemplarily, the second groove is recessed only relative to the side surface of the second thermal insulation pad 60 facing the partition beam 40; or, the second groove is recessed only relative to the side surface of the second thermal insulation pad 60 facing the second battery cell 31; or, the second groove is recessed simultaneously relative to the side surface of the second thermal insulation pad 60 facing the partition beam 40 and the side surface of the second thermal insulation pad 60 facing the second battery cell 31.

[0183] A second relatively concave groove is provided on the surface of the second thermal insulation pad 60 to form a second thickness weak area.

[0184] According to some embodiments of the present application, referring to Figure 21-23 The second weak zone W2 includes a second avoidance hole 62 provided on the second thermal insulation pad 60 , and the second avoidance hole 62 corresponds to the position of the second pressure relief mechanism 311 .

[0185] For the second battery cell 31, which releases low energy during thermal runaway, a second avoidance hole 62 can be provided on the second thermal insulation pad 60 at a position corresponding to the second pressure relief mechanism 311, and the second avoidance hole 62 is not blocked. The second avoidance hole 62 allows the second pressure relief mechanism 311 to be opened without obstruction, ensuring that the second pressure relief mechanism 311 opens quickly and discharges the exhaust into the collection chamber 41. At the same time, since the energy released by the second battery cell 31 is relatively low, when the exhaust from the second battery cell 31 passes through the collection chamber 41 and is sprayed onto the first thermal insulation pad 50 on the opposite side, the energy has decayed to the point where it is difficult to cause damage to the first battery cell 21 on the opposite side. This solution of directly opening the second avoidance hole 62 on the second thermal insulation pad 60 saves manufacturing costs compared to making notches or local thinning.

[0186] According to some embodiments of the present application, the second weak zone W2 further includes a second hot melt component, and the second hot melt component covers the second avoidance hole 62 , or the second hot melt component covers the second ventilation hole 43 .

[0187] The melting point of the second thermal melt member is lower than the melting points of the partition beam 40 and the second thermal insulation pad 60 .

[0188] Exemplarily, when the second hot melt component covers the second avoidance hole 62, a second hot melt component may be respectively covered at each second avoidance hole 62, or the same second hot melt component extending along the first direction x may be covered at each second avoidance hole 62; when the second hot melt component covers the second ventilation hole 43, a second hot melt component may be respectively covered at each second ventilation hole 43, or the same second hot melt component extending along the first direction x may be covered at each second ventilation hole 43.

[0189] By covering the second escape hole 62 or the second vent hole 43 with the second heat-melt component, the second heat-melt component can be broken when the temperature or pressure exceeds the tolerance value, and remain intact when the temperature or pressure falls below the tolerance value. If the second battery cell 31 experiences thermal runaway, the high-temperature, high-pressure gas ejected from the second battery cell 31 can quickly break the adjacent second heat-melt component, allowing the discharged gas to quickly enter the collection cavity 41 of the partition beam 40.

[0190] According to some embodiments of the present application, within a second projection plane perpendicular to the second direction y, the orthographic projection of the second avoidance hole 62 overlaps the orthographic projection of the second pressure relief mechanism 311. Exemplarily, the shape of the second avoidance hole 62 matches the shape of the second pressure relief mechanism 311, and the cross-sectional area of ​​the second avoidance hole 62 is no less than the cross-sectional area of ​​the second pressure relief mechanism 311, such that the orthographic projection of the second avoidance hole 62 overlaps the orthographic projection of the second pressure relief mechanism 311.

[0191] By making the orthographic projection of the second avoidance hole 62 in the second projection plane cover the orthographic projection of the second pressure relief mechanism 311 in the second 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.

[0192] According to some embodiments of the present application, the first strength weak zone W1 can be configured as the first notch 51, or the first thickness weak zone 52, or the first avoidance hole 53 in conjunction with any one of the first hot melt parts 70, and the second strength weak zone W2 can be configured as the second notch 61, or the second thickness weak zone, or the second avoidance hole 62 in conjunction with any one of the second hot melt parts.

[0193] According to some embodiments of the present application, referring to Figure 7 In a first projection plane perpendicular to the second direction y, the orthographic projection of the first vent hole 42 overlaps the orthographic projection of the first pressure relief mechanism. Exemplarily, the shape of the first vent hole 42 matches the shape of the first pressure relief mechanism, and the cross-sectional area of ​​the first vent hole 42 is not less than the cross-sectional area of ​​the first pressure relief mechanism, such that the orthographic projection of the first vent hole 42 overlaps the orthographic projection of the first pressure relief mechanism.

[0194] By ensuring that the orthographic projection of the first vent hole 42 within the first projection plane overlaps the orthographic projection of the first pressure relief mechanism within the first projection plane, the first pressure relief mechanism is left unobstructed, facilitating its rapid opening. This prevents the first pressure relief mechanism 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 being unable to vent or having poor venting during thermal runaway, thereby preventing the first battery cell 21 from rupturing or exploding due to the inability to quickly release internal pressure. Furthermore, this prevents the metal structure of the first pressure relief mechanism from simultaneously contacting the outer shell of the first battery cell 21 and the partition beam 40 when the first pressure relief mechanism is actuated.

[0195] According to some embodiments of the present application, referring to Figure 7In a second projection plane perpendicular to the second direction y, the orthographic projection of the second vent hole 43 overlaps the orthographic projection of the second pressure relief mechanism 311. Exemplarily, the shape of the second vent hole 43 matches the shape of the second pressure relief mechanism 311, and the cross-sectional area of ​​the second vent hole 43 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 43 can overlap the orthographic projection of the second pressure relief mechanism 311.

[0196] By ensuring that the orthographic projection of the second vent hole 43 within the second projection plane overlaps the orthographic projection of the second pressure relief mechanism 311 within the second 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 being unable to vent or having poor venting during thermal runaway, preventing the internal pressure of the second battery cell 31 from being rapidly released, potentially causing the outer casing 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 casing of the second battery cell 31 and the partition beam 40 during actuation.

[0197] According to some embodiments of the present application, referring to Figure 2-Figure 4 The first weak zone W1 is provided with multiple first pressure relief mechanisms, and the first battery cells 21 are provided with a one-to-one correspondence with the first weak zone W1. And / or the second weak zone W2 is provided with multiple second pressure relief mechanisms 311, and the second battery cells 31 are provided with a one-to-one correspondence with the second weak zone W2.

[0198] The first pressure relief mechanisms of the plurality of first battery cells 21 are provided in a one-to-one correspondence with the plurality of first weak areas W1, enabling one-to-one discharge of exhaust from each first battery cell 21. Similarly, the second pressure relief mechanisms 311 of the plurality of second battery cells 31 are provided in a one-to-one correspondence with the plurality of second weak areas W2, enabling one-to-one discharge of exhaust from each second battery cell 31.

[0199] 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.

[0200] For example, referring to Figure 4The 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.

[0201] 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.

[0202] In the battery device 100, there may be multiple battery cells, and the multiple battery cells may be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that the multiple battery cells are connected both in series and in parallel. The multiple battery cells may be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the multiple battery cells is accommodated in the housing 10. Of course, the battery device 100 may also be in the form of a battery device 100 module in which multiple battery cells are first connected in series, in parallel, or in a hybrid connection, and the multiple battery device 100 modules are then connected in series, in parallel, or in a hybrid connection to form a whole, and then accommodated in the housing 10. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for achieving electrical connection between the multiple battery cells.

[0203] Each battery cell may be a secondary battery device 100 . The secondary battery device 100 refers to a battery cell that can be continuously used by activating active materials by charging after discharge.

[0204] According to some embodiments of the present application, referring to Figure 5 、 Figure 7-Figure 9 The box body 10 includes a thermal management component 15, a first end plate 13 and a second end plate 14, the partition beam 40, the first end plate 13 and the second end plate 14 are all connected to the thermal management component 15, the first end plate 13 and the second end plate 14 are arranged at intervals along the first direction x, the first battery cell group 20 and the second battery cell group 30 are arranged between the first end plate 13 and the second end plate 14, and the partition beam 40 is connected between the first end plate 13 and the second end plate 14.

[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 connecting the partition beam 40, the first end plate 13 and the second end plate 14 to the thermal management component 15, and arranging the first battery cell group 20 and the second battery cell group 30 between the first end plate 13 and the second end plate 14, the thermal management component 15 can support the first battery cell group 20 and the second battery cell group 30, and can also cool the first battery cell group 20 and the second battery cell group 30.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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 .

[0212] According to some embodiments of the present application, see Figure 5 、 Figure 7-13The 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 thermal management component 15, the partition beam 40, the first end plate 13 and the second end plate 14 are all connected to the thermal management component 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.

[0213] The first battery cell group 20 and the second battery cell group 30 are arranged on the thermal management component 15 along the second direction y, the partition beam 40 is arranged between the first battery cell group 20 and the second battery cell group 30, the first thermal insulation pad 50 is arranged between the partition beam 40 and the first battery cell group 20, and the second thermal insulation pad 60 is arranged between the partition beam 40 and the second battery cell group 30.

[0214] A first pressure relief mechanism is provided on the side of the first battery cell 21 of the first battery cell group 20 facing the partition beam 40 , and a second pressure relief mechanism 311 is provided on the side of the second battery cell 31 of the second battery cell group 30 facing the partition beam 40 .

[0215] The partition beam 40 is provided with a collecting cavity 41 , a first vent hole 42 and a second vent hole 43 communicating with the collecting cavity 41 .

[0216] The first thermal insulation pad 50 is provided with a first weakened area W1 corresponding to the location of the first pressure relief mechanism. Within a first projection plane perpendicular to the second direction y, the orthographic projection of the first weakened area W1 overlaps the orthographic projection of the first pressure relief mechanism. The first weakened area W1 is configured as a first notch 51 provided on the side of the first thermal insulation pad 50 facing the partition beam 40.

[0217] The second thermal insulation pad 60 is provided with a second weakened area W2 corresponding to the position of the second pressure relief mechanism 311. Within a second projection plane perpendicular to the second direction y, the orthographic projection of the second weakened area W2 overlaps the orthographic projection of the second pressure relief mechanism 311. The second weakened area W2 is configured as a second notch 61 provided on the side of the second thermal insulation pad 60 facing the partition beam 40.

[0218] When the first pressure relief mechanism is actuated, the first notch 51 is ruptured by force, and the emissions from the first battery cell 21 can be directly discharged to the collection chamber 41 through the rupture of the first notch 51 and the first vent 42. If the emissions from the first battery cell 21 are sprayed onto the second thermal insulation pad 60 on the opposite side, since the second notch 61 is arranged on the side of the second thermal insulation pad 60 facing the partition beam 40, the second strength weak area W2 is not easy to break, thereby preventing the emissions from the first battery cell 21 from being sprayed onto the second battery cell 31 on the opposite side, and preventing the second battery cell group 30 on the opposite side from being affected by thermal runaway.

[0219] When the second pressure relief mechanism 311 is actuated, the second notch 61 is forced to rupture, and the emissions from the second battery cell 31 can be directly discharged into the collection chamber 41 through the rupture of the second notch 61 and the second vent 43. If the emissions from the second battery cell 31 are sprayed onto the first thermal insulation pad 50 on the opposite side, since the first notch 51 is arranged on the side of the first thermal insulation pad 50 facing the partition beam 40, the first strength weak area W1 is not easy to break, thereby preventing the emissions from the second battery cell 31 from spraying onto the first battery cell 21 on the opposite side, and preventing the first battery cell group 20 on the opposite side from being affected by thermal runaway.

[0220] 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 thermal insulation pad, disposed between the separation beam and the first battery cell group; a second thermal insulation pad, disposed between the separation beam 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 collection chamber is provided inside the partition beam, and the collection 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. A first weak strength area is provided on the side of the partition beam facing the first thermal insulation pad or on the first thermal insulation pad, and the first weak strength area corresponds to the position of the first pressure relief mechanism; a second weak strength area is provided on the side of the partition beam facing the second thermal insulation pad or on the second thermal insulation pad, and the second weak strength area corresponds to the position of the second pressure relief mechanism.

2. The battery device according to claim 1, wherein: In a first projection plane perpendicular to the second direction, the orthographic projection of the first weak strength area covers the orthographic projection of the first pressure relief mechanism.

3. The battery device according to claim 1, wherein: In a second projection plane perpendicular to the second direction, the orthographic projection of the second weak zone covers the orthographic projection of the second pressure relief mechanism.

4. The battery device according to claim 1, wherein: A first vent hole communicating with the 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; And / or, a second vent hole communicating with the 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.

5. The battery device according to any one of claims 1 to 4, characterized in that: The first weak strength area includes a first notch provided on a side of the first thermal insulation pad facing the partition beam.

6. The battery device according to any one of claims 1 to 4, characterized in that: The first strength weak area includes a first thickness weak area provided on the first thermal insulation pad.

7. The battery device according to claim 6, characterized in that The first thickness weakened area includes a first groove recessed relative to the surface of the first thermal insulation pad.

8. The battery device according to claim 4, wherein: The first weak strength area includes a first avoidance hole provided on the first thermal insulation pad, and the first avoidance hole corresponds to the position of the first pressure relief mechanism.

9. The battery device according to claim 8, characterized in that The first weak strength area further includes a first hot melt component, and the first hot melt component covers the first avoidance hole or the first ventilation hole.

10. The battery device according to claim 8, characterized in that In a first projection plane perpendicular to the second direction, the orthographic projection of the first avoidance hole covers the orthographic projection of the first pressure relief mechanism.

11. The battery device according to any one of claims 1 to 4, characterized in that: The second weak zone includes a second notch provided on a side of the second thermal insulation pad facing the partition beam.

12. The battery device according to any one of claims 1 to 4, characterized in that: The second strength weak area includes a second thickness weak area arranged on the second thermal insulation pad.

13. The battery device according to claim 12, characterized in that The second thickness weakened area includes a second groove recessed relative to the surface of the second thermal insulation pad.

14. The battery device according to claim 4, characterized in that The second weak strength area includes a second avoidance hole provided on the second thermal insulation pad, and the second avoidance hole corresponds to the position of the second pressure relief mechanism.

15. The battery device according to claim 14, characterized in that The second weak zone further includes a second hot melt component, and the second hot melt component covers the second avoidance hole or the second vent hole.

16. The battery device according to claim 14, wherein: In a second projection plane perpendicular to the second direction, the orthographic projection of the second avoidance hole covers the orthographic projection of the second pressure relief mechanism.

17. The battery device according to claim 4, characterized in that In a first projection plane perpendicular to the second direction, the orthographic projection of the first vent hole covers the orthographic projection of the first pressure relief mechanism.

18. The battery device according to claim 4, wherein: In a second projection plane perpendicular to the second direction, the orthographic projection of the second vent hole covers the orthographic projection of the second pressure relief mechanism.

19. The battery device according to claim 1, wherein: There are multiple first weak areas, and the first pressure relief mechanisms of the multiple first battery cells are arranged in one-to-one correspondence with the multiple first weak areas; and / or, There are multiple second weak areas, and the second pressure relief mechanisms of the multiple second battery cells are arranged in a one-to-one correspondence with the multiple second weak areas.

20. The battery device according to claim 1, wherein: The battery device also includes a box body, which includes a thermal management component, a first end plate and a second end plate. The partition beam, the first end plate and the second end plate are all connected to the thermal management component. The first end plate and the second end plate are arranged at intervals along the first direction. The first battery cell group and the second battery cell group are arranged between the first end plate and the second end plate. The partition beam is connected between the first end plate and the second end plate.

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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