Battery apparatus, electrical apperatus, energy storage apperatus and battery unit

Abstract

Disclosed in the embodiments of the present disclosure are a battery apparatus, an electrical apparatus, an energy storage apparatus and a battery unit. The battery apparatus comprises: a plurality of battery units arranged in a first direction, each battery unit comprising a housing and a battery cell group located within the housing, the battery cell group comprising at least two battery cells arranged in the first direction, the plurality of battery units comprising a first battery unit and a second battery unit adjacent to each other in the first direction, battery cells of the first battery unit comprising a first battery cell closest to the second battery unit in the first direction, and battery cells of the second battery unit comprising a second battery cell closest to the first battery unit in the first direction; and at least one thermal insulation member, at least located between the first battery cell and the second battery cell. The impact of a battery undergoing thermal runaway on other batteries can be reduced.

Description

Battery devices, electrical devices, energy storage devices and battery cells Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to battery devices, power consumption devices, energy storage devices, and battery cells. Background Technology

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power.

[0003] In the event of thermal runaway in a single battery cell, the cell releases a significant amount of heat. If this heat is transferred to other battery cells, it can trigger thermal diffusion and potentially lead to secondary disasters. Therefore, mitigating thermal runaway-induced thermal diffusion is a topic of ongoing research in the industry. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this disclosure provide a battery device, an electrical device, an energy storage device, and a battery cell, which can suppress the transfer of heat between adjacent battery cells and reduce the impact of thermal runaway battery cells on other batteries.

[0005] In a first aspect, embodiments of this disclosure provide a battery device, comprising: a plurality of battery cells arranged along a first direction, each battery cell including a housing and a battery cell group located within the housing, the battery cell group including at least two battery cells arranged along the first direction, the plurality of battery cells including a first battery cell and a second battery cell adjacent to each other along the first direction, the battery cells of the first battery cell including a first battery cell closest to the second battery cell along the first direction, and the battery cells of the second battery cell including a second battery cell closest to the first battery cell along the first direction; and at least one heat insulation member located at least between the first battery cell and the second battery cell.

[0006] Because the heat insulation component is located between the first battery cell in the first battery cell and the second battery cell in the second battery cell, in the event of thermal runaway in one of the battery cells, the heat from the casing of that battery cell is blocked by the heat insulation component. This prevents a large amount of heat from being transferred to the casing of that battery cell and then further to other battery cells, thus reducing the risk of heat diffusion. Specifically, it prevents heat transferred to the casing from being transferred along the first direction to the casing of adjacent battery cells, or from being transferred along the surface of the casing to the side plate and then to adjacent battery cells. Furthermore, the heat insulation component can also absorb some of the group tolerances between battery cells or individual battery cells. Additionally, grouping at least two battery cells together and sharing a casing to form a battery cell helps to reduce the space occupied by the casing and improves the volume utilization rate of the battery device.

[0007] In some embodiments, at least one heat insulation element includes at least one first heat insulation element located inside the housing of the first battery cell, or the first heat insulation element located inside the housing of the second battery cell, or the number of first heat insulation elements is multiple, and the first heat insulation elements are provided inside the housing of the first battery cell and the housing of the second battery cell.

[0008] Since the first heat insulation element is located inside the casing of the first battery cell and / or the casing of the second battery cell, it can block heat transfer from the inside of the battery cell that has experienced thermal runaway to the casing, thereby reducing the heat transfer path between battery cells. This helps to reduce the probability that the battery cell with a higher internal temperature will transfer heat to other battery cells through the casing, and helps to suppress heat diffusion, which can reduce the risk of large-scale thermal runaway of the battery device.

[0009] In some embodiments, the first battery cell has a first housing wall located between the first battery cell and the second battery cell, the second battery cell has a second housing wall located between the first battery cell and the second battery cell, a first heat insulation member is connected between the first battery cell and the first housing wall, and / or, the first heat insulation member is connected between the second battery cell and the second housing wall.

[0010] Since the first heat insulation element is connected between the first housing wall and / or the second housing wall and the battery cell, it not only determines the relative position between the heat insulation element and the battery cell, reliably blocking heat transfer to the outer casing and reducing the heat transfer path between battery cells, but also reduces the internal space of the battery cell casing by allowing the first heat insulation element to be sandwiched between the housing wall and the battery cell, thus reducing space waste and improving the volume utilization rate of the battery device.

[0011] In some embodiments, each battery cell includes a main body, a sealing edge, and a transition portion connecting the main body and the sealing edge. In the same projection plane perpendicular to the first direction, the projection of the first heat insulation member along the first direction at least partially overlaps with the projection of the main body of the battery cell along the first direction, and the projection area of ​​the main body accounts for 70% to 100% of the projection area of ​​the first heat insulation member.

[0012] Therefore, it can not only reliably block heat transfer to the casing and reduce the heat transfer path between battery cells, but also suppress the size of the first heat insulation component and reduce the impact of the first heat insulation component on the weight and volume of the battery cell.

[0013] In some embodiments, each battery cell includes a main body, a sealing edge, and a transition portion connecting the main body and the sealing edge. The first heat insulation member includes a first heat insulation layer and a first encapsulation member covering the first heat insulation layer. In the same projection plane perpendicular to the first direction, the projection of the first heat insulation layer along the first direction at least partially overlaps with the projection of the main body of the battery cell along the first direction. The projection area of ​​the main body accounts for 70% to 100% of the projection area of ​​the first heat insulation layer.

[0014] Since the first heat insulation component includes a first heat insulation layer and a first encapsulation component covering the first heat insulation layer, it is advantageous to use heat insulation materials without a fixed shape, such as liquid or gel states. Since the area of ​​the projection of the main body perpendicular to the first direction accounts for 70% to 100% of the area of ​​the projection of the first heat insulation layer perpendicular to the first direction, it can not only reliably block heat transfer to the outer casing and reduce the heat transfer path between battery cells, but also reduce the impact of setting the first heat insulation component on the weight and volume of the battery cells.

[0015] In some embodiments, the thickness of the first thermal insulation member is in the range of 1 mm to 10 mm along the first direction.

[0016] A first insulation component with appropriate thickness can balance the insulation effect with the impact on the weight and volume of the battery cell.

[0017] In some embodiments, the battery device further includes a first end limiter and a second end limiter disposed opposite to each other along a first direction, a plurality of battery cells arranged between the first end limiter and the second end limiter along the first direction, and / or a first heat insulation member is also provided between the first end limiter and the battery cells adjacent to the first end limiter along the first direction, and / or between the second end limiter and the battery cells adjacent to the second end limiter along the first direction.

[0018] The first heat insulation element located inside the casing of the battery cell can be disposed not only between adjacent battery cells, but also between the battery cell and the adjacent end restrictor. This can further block heat transfer to the casing, further reliably reduce the heat transfer path, reduce the probability of heat diffusion, and also reduce the possibility of heat being further transferred to other functional components through the end restrictor, causing battery device malfunction.

[0019] In some embodiments, at least one heat insulation element includes a second heat insulation element, which is connected between the first battery cell and the second battery cell along a first direction.

[0020] Since the second thermal insulation element connects the first and second battery cells, it can further prevent heat from being transferred from the casing of one battery cell to the casing of another, reliably reducing the heat transfer path between battery cells. This helps to reduce the probability that a higher-temperature battery cell will transfer heat to its adjacent battery cells, thereby reducing the risk of large-scale thermal runaway in the battery device. The second thermal insulation element can also reduce the packing tolerance between battery cells.

[0021] In some embodiments, in the same projection plane perpendicular to the first direction, the projection of the second heat insulation member along the first direction at least partially overlaps with the projection of the battery cell housing along the first direction, and the projected area of ​​the housing accounts for 70% to 100% of the projected area of ​​the second heat insulation member.

[0022] Therefore, it can not only reliably block heat transfer between adjacent battery cells and reduce the heat transfer path between battery cells, but also reduce the impact of setting a second heat insulation component on the weight and volume of the battery device, which is conducive to improving the volume utilization rate of the battery device.

[0023] In some embodiments, the second heat insulation member includes a second heat insulation layer and a second encapsulation member covering the heat insulation layer. In the same projection plane perpendicular to the first direction, the projection of the second heat insulation layer along the first direction at least partially overlaps with the projection of the battery cell housing along the first direction, and the projected area of ​​the housing accounts for 70% to 100% of the projected area of ​​the second heat insulation layer.

[0024] Since the second heat insulation component includes a second heat insulation layer and a second encapsulation component covering the second heat insulation layer, it is advantageous to use heat insulation materials without a fixed shape, such as liquid or gel states. Since the area of ​​the outer shell projected perpendicular to the first direction accounts for 70% to 100% of the area of ​​the second heat insulation component projected perpendicular to the first direction, it can not only reduce the heat transfer path between battery cells and reduce the transfer of heat from the internally hot battery cells to adjacent battery cells through the outer shell, thereby further reducing the risk of large-scale thermal runaway of the battery device, but also reduce the impact of setting the second heat insulation component on the weight and volume of the battery device, which is conducive to improving the volume utilization rate of the battery device.

[0025] In some embodiments, the thickness of the second insulation member is in the range of 1 mm to 10 mm along the first direction.

[0026] A second heat insulation component with appropriate thickness can balance the heat insulation effect with the impact on the weight and volume of the battery cell.

[0027] In some embodiments, the battery device further includes a first end limiter and a second end limiter disposed opposite to each other along a first direction, a plurality of battery cells arranged between the first end limiter and the second end limiter along the first direction, and / or a second heat insulation member is also provided between the first end limiter and the battery cells adjacent to the first end limiter along the first direction, and / or between the second end limiter and the battery cells adjacent to the second end limiter along the first direction.

[0028] The second heat insulation element located between battery cells can be provided not only between adjacent battery cells, but also between a battery cell and an adjacent end restrictor. This can further block heat from being transferred from the casing of a battery cell that has experienced thermal runaway to the surrounding area, further reliably reduce the heat transfer path, reduce the probability of heat diffusion, and also reduce the possibility of heat being further transferred to other functional components through the end restrictor, causing battery device malfunctions.

[0029] In some embodiments, at least one heat insulation member includes a second heat insulation member connected between a first battery cell and a second battery cell along a first direction, between a first end restrictor and a battery cell adjacent to the first end restrictor along the first direction, and between a second end restrictor and a battery cell adjacent to the second end restrictor along the first direction.

[0030] This can completely block the heat from the thermally runaway battery cell from being transferred to the surrounding area along the first direction, thereby reliably reducing the heat transfer path from the thermally runaway battery cell and thus reliably reducing the risk of large-scale thermal runaway in the battery device.

[0031] In some embodiments, the battery device further includes a housing having a first housing wall and a second housing wall disposed opposite to each other along a first direction, a first end limiter including the first housing wall, and a second end limiter including the second housing wall; or, the battery device further includes a first end plate and a second end plate disposed opposite to each other along a first direction, the first end limiter including the first end plate, and the second end limiter including the second end plate.

[0032] In a battery device, regardless of whether the end of the battery cell group arranged along the first direction is provided with an end plate or a housing wall, the adverse effects of thermal runaway battery cells on surrounding battery cells or other components can be reduced by providing a first heat insulation component and / or a second heat insulation component.

[0033] In some embodiments, the insulating material of the insulating component includes at least one of aerogel, ceramic insulating material, and foamed material; and / or, the thermal conductivity of the insulating material is in the range of 0.03 W / (m·K) to 0.10 W / (m·K).

[0034] This helps to give the insulation component good heat insulation properties, and more effectively block heat transfer between battery cells and / or between battery cells and other surrounding components.

[0035] In some embodiments, the heat insulation component includes a first heat insulation component located inside the housing of the battery cell, and a second heat insulation component located outside the housing of the battery cell and in contact with the housing surface. The first heat insulation component and the second heat insulation component are made of the same heat insulation material and / or have the same thickness.

[0036] This allows for the production of heat insulation components of the same specifications, which simplifies the manufacturing process, improves production efficiency, and reduces production costs. In addition, the first and second heat insulation components can be appropriately determined based on the size of the battery cell, the size of a single battery unit, the assembly size of battery unit groups, and the desired heat insulation effect.

[0037] In some embodiments, each battery cell further includes a buffer, which is located between adjacent battery cells along a first direction within the same battery cell.

[0038] Since the buffer is located between adjacent battery cells, it can absorb assembly errors between battery cells, provide buffer space for battery cell expansion, and limit excessive expansion of battery cells, which helps to extend the service life of battery cells.

[0039] In some embodiments, each battery cell includes a main body, a sealing edge, and a transition portion connecting the main body and the sealing edge. In the same projection plane perpendicular to the first direction, the projection of the buffer along the first direction and the projection of the adjacent main body along the first direction at least partially overlap, and the projection area of ​​the main body accounts for 70% to 100% of the projection area of ​​the buffer.

[0040] Since the area of ​​the main body's projection perpendicular to the first direction accounts for 70% to 100% of the area of ​​the buffer member's projection perpendicular to the first direction, it can not only absorb the assembly error between battery cells and provide buffer space for battery cell expansion, but also reliably limit the excessive expansion of battery cells. In addition, a buffer member of appropriate size helps to reduce the impact of an excessively large buffer member on the volume and weight of the battery cell.

[0041] In some embodiments, in the same battery cell, along the first direction, the ratio of the thickness of the buffer to the thickness of the individual battery cell along the first direction is in the range of 1% to 10%.

[0042] This effectively absorbs assembly errors between battery cells, provides suitable buffer space for battery cell expansion and limits excessive expansion, and also saves materials, reduces the weight of battery devices and lowers costs.

[0043] In some embodiments, the cushioning element is made of at least one of foam and silicone rubber.

[0044] Foam and silicone rubber have good cushioning and protection properties and resistance to compression set. They can also provide support even at high temperatures, enabling the cushioning components to function reliably.

[0045] In some embodiments, the battery cell is a pouch cell.

[0046] By encasing the pouch cell into the casing, the pouch cells, which are originally difficult to arrange in groups due to their easy deformation, can be assembled into groups as neatly as prismatic cells, improving assembly ease. In addition, pouch cells are characterized by difficulty in controlling the ejection direction in the event of thermal runaway. However, by encasing the pouch cells in the casing, the ejection direction in the event of thermal runaway can be controlled by controlling the ejection direction of the casing, thereby reducing the risk of thermal runaway cells causing thermal propagation.

[0047] In some embodiments, the housing has openings and pressure relief ports located on different sides; the battery cell also includes a top cover assembly disposed on the housing and closing the openings and a pressure relief cover disposed on the housing and closing the pressure relief ports, the pressure relief cover being configured to open the pressure relief ports in the event of thermal runaway of the battery cell.

[0048] Because the casing has a pressure relief vent, in the event of thermal runaway in a battery cell, the gases and emissions generated during the runaway can be discharged through the vent, thus relieving pressure within the casing's containment space. Furthermore, the gases and emissions generated during thermal runaway are guided by the pressure relief vent, preventing them from scattering and allowing for directional emission. This makes the direction of the high-temperature emissions during thermal runaway controllable, reducing the likelihood of these emissions affecting other battery cells or other components within the battery device, thereby improving the reliability of the battery cell. Since the pressure relief vent and the opening are located on different sides, the high-temperature emissions are less likely to come into contact with the top cover assembly covering the opening during discharge. This facilitates thermoelectric separation and reduces the risk of emissions diffusing through the top cover assembly to the top covers of other surrounding battery cells, potentially damaging electrical components such as connectors and busbars on the top cover assembly, further reducing the risk of thermal diffusion. In addition, since the pressure relief cover closes the pressure relief port in the absence of thermal runaway, objects inside the casing can fall out, and the possibility of external debris entering the casing can be reduced, thereby further improving the reliability of the battery cell.

[0049] In some embodiments, the top cover assembly is located on one side of the battery cell, and the pressure relief port is located on the opposite side of the top cover assembly.

[0050] This effectively achieves thermoelectric separation and improves the reliability of the battery cell.

[0051] In some embodiments, each battery cell group includes a first pouch battery cell and a second pouch battery cell. The top cover assembly includes a top cover body and a sampling electrode and two adapter electrodes disposed on the top cover body. One adapter electrode is electrically connected to the tab of the first pouch battery cell, and the other adapter electrode is electrically connected to the tab of the second pouch battery cell. The polarities of the tabs corresponding to the two adapter electrodes are opposite. The sampling electrode is electrically connected to the tabs of the first pouch battery cell and the second pouch battery cell that are not connected to the adapter electrodes. Part of the sampling electrode is exposed on the top cover body.

[0052] This facilitates easy connection between the top cover assembly and the two pouch cells, as well as series connection between the two pouch cells. Furthermore, by enabling the sampling electrode to function as both an adapter and a sampling output component, it helps reduce the number of parts, increases integration, and improves assembly efficiency.

[0053] In some embodiments, each adapter electrode is configured to include a tab adapter portion and an exposed portion connected to the tab adapter portion. The tab adapter portion includes an adapter surface extending in a second direction, and the exposed portion is exposed outside the housing. Each battery cell includes an electrode assembly and a sealed bag for encapsulating the electrode assembly. The tab extends from the sealed bag in the second direction, and the connecting surface of the tab adapter portion is connected to the tab surface.

[0054] Therefore, the tabs extending along the second direction can be connected to the transition surface extending along the second direction without bending, thereby reducing the risk of tab breakage and poor connection caused by tab bending, and improving the reliability of battery cells and battery devices.

[0055] In some embodiments, the sampling electrode is configured to include two tab connection portions and a sampling exposure portion connected to the tab connection portions. The sampling exposure portion is exposed on the top cover body. The tab connection portion includes a tab connection surface extending along a second direction. Each tab connection surface is connected to a tab surface that is not connected to the adapter electrode.

[0056] Therefore, the tabs extending along the second direction can be connected to the tab connection surfaces extending along the second direction without bending, thereby reducing the risk of tab breakage and poor connection caused by tab bending, and improving the reliability of battery cells and battery devices.

[0057] In some embodiments, two adapter electrodes are arranged side by side on the top cover body along a first direction, and / or two adapter electrodes are arranged side by side on the top cover body along a third direction, and an insulating shield is provided between the tabs of two adjacent adapter electrodes, with the first direction, the second direction and the third direction being perpendicular to each other.

[0058] The risk of accidental short circuit between the two adapter electrodes can be reduced by installing insulating shields.

[0059] In some embodiments, the insulating shielding member protrudes from both ends of the adapter electrode along a second direction.

[0060] This allows the two transition electrodes to be well separated at their ends in the second direction, which helps to increase the electrical clearance and creepage distance between the two transition electrodes and improve insulation performance.

[0061] In some embodiments, the battery cell further includes an insulating support connected to an insulating shield. The insulating shield has insulating supports on both sides of the opposite sides along the direction of the arrangement of the two transfer electrodes. The insulating supports are located on the side of the top cover body facing the battery cell group along the second direction. One end of the transfer electrode away from the exposed portion abuts against the side of the insulating support facing the top cover body.

[0062] The insulating supports on both sides of the insulating shield support the ends of the two transition electrodes that are away from the exposed parts. The distance from the insulating shield to the other transition electrode's tab is increased along the surface of the insulating shield through the insulating supports, thereby increasing the creepage distance between the corresponding tabs of the two transition electrodes and improving the insulation performance.

[0063] In some embodiments, in the tab connection portions of two adjacent adapter electrodes, the tab connection portion of each adapter electrode protrudes from the insulating base on the side opposite to the corresponding other adapter electrode.

[0064] This ensures that the positive or negative electrode tab connected to the electrode tab adapter will hardly come into contact with the insulating base and will remain straight, reducing the possibility of the electrode tab bending due to interference between the insulating base and the positive or negative electrode tab.

[0065] In some embodiments, the insulating shield includes: an insulating body connected to the side of the insulating platform facing the top cover body, the insulating body being clamped between the tabs of two adjacent transition electrodes; and an insulating auxiliary component connected to the side of the insulating platform away from the top cover body, the thickness of the insulating auxiliary component along the arrangement direction of the two adjacent transition electrodes being less than the thickness of the insulating body along the arrangement direction of the two adjacent transition electrodes, and the dimension of the insulating auxiliary component along a second direction being greater than the thickness of the insulating auxiliary component along the arrangement direction of the two adjacent transition electrodes.

[0066] Because the dimension of the insulating accessory along the second direction is greater than its thickness along the arrangement direction of two adjacent transition electrodes, the creepage distance between the transition electrodes is mainly provided by the dimension of the insulating accessory along the second direction, which helps to increase the creepage distance and improve insulation reliability. Since the dimension of the insulating accessory along the second direction is greater than its thickness along the arrangement direction of two adjacent transition electrodes, the cross-sectional area of ​​the insulating accessory perpendicular to the arrangement direction of the two adjacent transition electrodes is larger. Reducing the thickness of the insulating accessory along the arrangement direction of the two adjacent transition electrodes helps to reduce the mass of the insulating accessory and increase its mass energy density.

[0067] In some embodiments, the insulating shield further includes an insulating separator connected to the side of the insulating body away from the insulating base. The insulating separator protrudes along a second direction from the side of the exposed portion away from the electrode tab adapter. The thickness of the insulating separator along the arrangement direction of two adjacent adapter electrodes is less than the thickness of the insulating body along the arrangement direction of two adjacent adapter electrodes. The dimension of the insulating separator along the second direction is greater than the thickness of the insulating separator along the arrangement direction of two adjacent adapter electrodes.

[0068] Because the dimension of the insulating separator along the second direction is greater than its thickness along the arrangement direction of two adjacent transition electrodes, the creepage distance between the exposed portions of the two adjacent transition electrodes is mainly provided by the dimension of the insulating separator along the second direction. This is beneficial for increasing the creepage distance and improving insulation reliability. Since the dimension of the insulating separator along the second direction is greater than its thickness along the arrangement direction of two adjacent transition electrodes, the cross-sectional area of ​​the insulating separator perpendicular to the arrangement direction of the two adjacent transition electrodes is larger. Reducing the thickness of the insulating separator along the arrangement direction of the two adjacent transition electrodes helps to minimize its mass and improve the battery's mass energy density.

[0069] In some embodiments, the sampling electrode and the transfer electrode are respectively injection molded with the top cover body.

[0070] Therefore, the sampling electrode and the adapter electrode are integrated with the top cover body, resulting in a more stable connection and improved battery reliability.

[0071] In some embodiments, the pressure relief cover is an insulating film with a melting point greater than or equal to 100°C and less than or equal to 500°C.

[0072] The pressure relief cover is an insulating film that helps to insulate the battery cells inside the casing from the components outside the casing. The melting point of the insulating film is greater than or equal to 100°C and less than or equal to 500°C. An insulating film with a suitable melting point can both block the pressure relief port under normal cyclic operation of the battery cells (without thermal runaway) and be quickly melted and ruptured to relieve pressure in the event of thermal runaway of the battery cells inside the casing.

[0073] In some embodiments, the pressure relief cover is a metal cover having a weakened area for pressure relief.

[0074] By setting a weakened zone on the pressure relief cover, the metal cover can effectively block the pressure relief port when thermal runaway does not occur, and can relieve pressure through the fracture of the weakened zone in the event of thermal runaway.

[0075] In some embodiments, the wall thickness of the weakened area is less than the wall thickness of the rest of the pressure relief cover.

[0076] Therefore, in the event of thermal runaway in the battery cell, the gases and high-temperature emissions generated by the thermal runaway can more easily break through the weakened area, thereby relieving pressure inside the casing.

[0077] In some embodiments, the top cover assembly includes a top cover body having a mounting groove that opens in a second direction toward one side of the housing, the opening edge of the housing being inserted into the mounting groove.

[0078] Inserting the opening edge of the outer shell into the mounting groove, the groove wall of the mounting groove constrains the opening edge of the outer shell, which helps to reduce the shaking of the top cover body relative to the outer shell.

[0079] In some embodiments, the mounting groove has a guide rib located inside the housing. The guide rib has a guide surface on the side facing the sidewall of the housing, pointing from the opening of the mounting groove to the bottom of the mounting groove, and the guide surface is inclined towards the sidewall of the housing.

[0080] During the installation of the top cover body into the outer shell, the guide surface of the guide rib guides the edge of the opening of the outer shell to move closer to the outer side wall of the mounting groove, thereby guiding the opening of the outer shell to a predetermined position within the mounting groove. The guide rib and the outer side wall of the mounting groove further constrain the edge of the opening of the outer shell into a narrow gap. In addition, since the guide surface of the guide rib is gradually inclined, the opening of the mounting groove is not significantly reduced, allowing the outer shell to be easily inserted into the mounting groove.

[0081] A second aspect of this disclosure provides an electrical device including a battery device for providing electrical energy.

[0082] This helps reduce the risk of large-scale thermal runaway in electrical devices.

[0083] A third aspect of this disclosure provides an energy storage device, including a battery device capable of storing electrical energy and providing electrical energy.

[0084] This helps reduce the risk of large-scale thermal runaway in energy storage devices.

[0085] A fourth aspect of this disclosure provides a battery cell comprising: a housing; a battery cell assembly located within the housing, the battery cell assembly including at least two battery cells arranged along a first direction; and at least one heat insulation member located between the housing and the battery cell assembly.

[0086] This helps reduce the risk that a battery cell with a high temperature (e.g., thermal runaway) will transfer heat through its casing to surrounding structures (e.g., other battery cells or other components), thereby reducing the risk of thermal runaway battery cells causing thermal diffusion.

[0087] In some embodiments, at least one heat insulation element includes at least two first heat insulation elements; the housing includes a first housing wall and a second housing wall perpendicular to a first direction; at least two battery cells include a first battery cell and a second battery cell, at least one first heat insulation element is provided between the first battery cell and the first housing wall adjacent to the first battery cell along the first direction, and at least one first heat insulation element is provided between the second battery cell and the second housing wall adjacent to the second battery cell along the first direction.

[0088] This helps to more effectively block heat transfer from the inside of the battery cell that has experienced thermal runaway to the casing, further reducing the risk that the high-temperature battery cell will transfer heat to the surrounding structure through the casing, thereby further reducing the risk of thermal runaway caused by the battery cell.

[0089] In some embodiments, the battery cell further includes at least one buffer element connected between adjacent battery cells along a first direction.

[0090] This helps to absorb assembly errors between battery cells, provides buffer space for battery cell expansion, and can also suppress excessive expansion of battery cells, which helps to extend the service life of battery cells. Attached Figure Description

[0091] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0092] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0093] Figure 2 is an exploded perspective view of a portion of the structure of a battery device provided in some embodiments of this disclosure;

[0094] Figure 3 is a front view of the structure shown in Figure 2;

[0095] Figure 4 is a side view of the structure shown in Figure 2;

[0096] Figure 5 is a top view of the structure shown in Figure 2;

[0097] Figure 6 is a schematic diagram of the AA section of Figure 5;

[0098] Figure 7 is an enlarged schematic diagram of region B in Figure 6;

[0099] Figure 8 is an exploded perspective view of a battery cell provided in some embodiments of this disclosure;

[0100] Figure 9 is a schematic diagram of a battery cell provided in some embodiments of this disclosure;

[0101] Figure 10 is a schematic diagram of a battery cell from another angle, provided in some embodiments of this disclosure;

[0102] Figure 11 is a side view schematic diagram of a battery cell provided in some embodiments of this disclosure;

[0103] Figure 12 is a CC cross-sectional view of Figure 11 provided in some embodiments of this disclosure;

[0104] Figure 13 is an enlarged schematic diagram of region D of Figure 12 provided in some embodiments of this disclosure;

[0105] Figure 14 is an enlarged schematic diagram of region E in Figure 12 provided in some embodiments of this disclosure;

[0106] Figure 15 is a structural schematic diagram of the top cover assembly provided in some embodiments of this disclosure;

[0107] Figure 16 is a schematic cross-sectional view of Figure 15 provided in some embodiments of this disclosure;

[0108] Figure 17 is a schematic diagram of the GG cross-section of Figure 15 provided in some embodiments of this disclosure;

[0109] Figure 18 is a side view of a top cover assembly provided in some embodiments of this disclosure;

[0110] Figure 19 is an exploded perspective view of a top cover assembly provided in some embodiments of this disclosure;

[0111] Figure 20 is a schematic diagram of the structure of an energy storage device provided in some embodiments of this disclosure.

[0112] Reference numerals: 1000 Vehicle; 100 Battery unit; 200 Controller; 300 Motor; 2000 Energy storage device; 400 Electrical compartment; 4 Battery cell; 40 Pressure relief cover; 41 Weakened area; 42 Housing; 421 First housing wall; 422 Second housing wall; 423 Opening; 424 Pressure relief port; 20 Top cover assembly; 21 Top cover body; 213 Recess; 214 Mounting groove; 22 Sampling electrode; 221 Electrode tab connection; 222 Sampling exposed part; 224 Bending part; 23 Adapter electrode; 231 Electrode tab adapter; 232 Exposed part; 25 Insulating shield; 251 Insulating body; 252 Insulating accessory; 253 Insulating separator; 26 Insulation Support platform; 30 Battery cell assembly; 38 Tab; 31 Positive tab; 32 Negative tab; 33 First battery unit; 331 First battery cell; 34 Second battery unit; 341 Second battery cell; 35 Main body; 36 Sealing part; 37 Transition part; 15 Heat insulation component; 151 First heat insulation component; 1511 First heat insulation layer; 1512 First encapsulation component; 152 Second heat insulation component; 1521 Second heat insulation layer; 1522 Second encapsulation component; 5 First end restrictor; 52 First end plate; 6 Second end restrictor; 62 Second end plate; 7 Buffer component; 8 Busbar component; 901 Guide rib; 9011 Guide surface; X First direction; Y Second direction; Z Third direction. Detailed Implementation

[0113] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this disclosure can be combined with each other, and the detailed descriptions in the specific embodiments should be understood as explanations of the purpose of this disclosure and should not be regarded as undue limitations on this disclosure.

[0114] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0115] In the description of this disclosure, the technical terms "first," "second," "third," "fourth," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0116] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0117] In the description of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0118] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0119] In the description of this disclosure, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0120] In the description of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" shall be interpreted broadly and may refer to direct contact, contact through an intermediate medium, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0121] In the description of embodiments of this disclosure, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are subject to a certain degree of tolerance and / or error, including cases of being substantially parallel and substantially perpendicular.

[0122] The embodiments of this disclosure will now be described in detail.

[0123] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side to store electrical energy and provide power as needed.

[0124] In the event of thermal runaway in a single battery cell, the runaway cell releases a large amount of heat. If this heat is transferred to other battery cells, it can trigger thermal runaway and cause secondary disasters. Here, thermal runaway refers to the phenomenon where the exothermic chain reaction within a single battery cell causes an uncontrollable rise in battery temperature. Thermal runaway refers to the phenomenon where the thermal runaway of one battery cell within a battery pack triggers a chain reaction of thermal runaway in other battery cells. Therefore, reducing thermal runaway caused by thermal runaway is an ongoing research topic in the industry.

[0125] Research indicates that heat transfer from thermally runaway battery cells is one of the causes of thermal propagation. Therefore, suppressing or even blocking heat transfer can reduce the risk of thermal propagation. Further research shows that the heat released by a thermally runaway battery cell can be transferred in multiple directions through the casing and further to other battery cells through other components connected to or in contact with the casing, or through adjacent casings, thus posing a risk of thermal propagation. Therefore, suppressing or even blocking the transfer of heat released by a thermally runaway battery cell between the battery cell casings can reduce heat transfer through the casing, thereby reducing the risk of larger-scale thermal runaway.

[0126] Based on this technical concept, this disclosure provides a battery device, which includes: a plurality of battery cells arranged along a first direction, each battery cell including a housing and a group of battery cells located within the housing, the group of battery cells including at least two battery cells arranged along the first direction, the plurality of battery cells including a first battery cell and a second battery cell adjacent to each other along the first direction, the battery cells of the first battery cell including a first battery cell closest to the second battery cell along the first direction, and the battery cells of the second battery cell including a second battery cell closest to the first battery cell along the first direction; and at least one heat insulation member located at least between the first battery cell and the second battery cell.

[0127] Because the heat insulation component is located between the first battery cell in the first battery cell and the second battery cell in the second battery cell, in the event of thermal runaway in one of the battery cells, the heat from the casing of that battery cell is blocked by the heat insulation component. This prevents a large amount of heat from being transferred to the casing of that battery cell and then further to other battery cells, thus reducing the risk of heat diffusion. Specifically, it prevents heat transferred to the casing from being transferred along the first direction to the casing of adjacent battery cells, or from being transferred along the surface of the casing to the side plate and then to adjacent battery cells. Furthermore, the heat insulation component can also absorb some of the group tolerances between battery cells or individual battery cells. Additionally, grouping at least two battery cells together and sharing a casing to form a battery cell helps to reduce the space occupied by the casing and improves the volume utilization rate of the battery device.

[0128] The battery device provided in this disclosure can be used, but is not limited to, in electrical devices such as energy storage devices, vehicles, ships, or aircraft.

[0129] This disclosure also provides an electrical device including the aforementioned battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0130] This disclosure also provides an energy storage device including the above-described battery device, the energy storage device including an energy storage container, an energy storage cabinet, etc.

[0131] For ease of explanation, an example of an electrical device according to an embodiment of this disclosure, namely a vehicle 1000, will be used for description. The description will now be provided in conjunction with the accompanying drawings.

[0132] Figure 1 is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this disclosure. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. As shown in Figure 1, a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0133] In some embodiments of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0134] Figure 2 is an exploded perspective view of a portion of the structure of a battery device provided in some embodiments of this disclosure.

[0135] The battery apparatus mentioned in the embodiments of this disclosure may include one or more battery cells 4, which are connected in series, parallel, or mixed connections via a busbar 8. Each battery cell 4 includes one or more battery cell groups for providing voltage and capacity. A battery cell group may include multiple battery cells (see FIG. 8), which are connected in series, parallel, or mixed connections via connectors, such as in series via sampling electrode 22 and adapter electrode 23 as shown in FIG. 9. The electrical connection of multiple battery cells can form a power supply circuit, and connecting the electric vehicle motor 300 or other electrical appliances to this power supply circuit can form an electrical loop.

[0136] In some embodiments, the battery device may include a battery module, which is formed by arranging multiple battery cells.

[0137] As an example, a battery module consists of multiple battery cells arranged and fixed together to form a single module. Alternatively, a battery module can be formed by fitting multiple battery cells between two end plates.

[0138] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cells housed within the housing.

[0139] As an example, battery cells can form battery modules, and battery cells can be housed in a housing by fixing the battery modules in the housing.

[0140] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0141] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0142] As an example, the battery cell can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. In a specific embodiment, the battery cell is a pouch battery cell. Exemplarily, the pouch battery cell may include a sealed bag for encapsulating the electrode assembly and electrolyte. Specifically, the sealed bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0143] The following describes some embodiments of the present disclosure in detail with reference to Figures 2 to 19.

[0144] Figure 2 is an exploded perspective view of a portion of the structure of a battery device provided in some embodiments of the present disclosure; Figure 3 is a front view of the structure shown in Figure 2; Figure 4 is a side view of the structure shown in Figure 2; Figure 5 is a top view of the structure shown in Figure 2; Figure 6 is a cross-sectional view AA of Figure 5; Figure 7 is an enlarged view of region B of Figure 6; Figure 8 is an exploded perspective view of a battery cell provided in some embodiments of the present disclosure; Figure 9 is a schematic diagram of a battery cell provided in some embodiments of the present disclosure; Figure 10 is a schematic diagram of a battery cell from another angle provided in some embodiments of the present disclosure; Figure 11 is a side view of a battery cell provided in some embodiments of the present disclosure; Figure 12 Figure 11 is a CC cross-sectional view of some embodiments of the present disclosure; Figure 13 is an enlarged view of region D of Figure 12 of some embodiments of the present disclosure; Figure 14 is an enlarged view of region E of Figure 12 of some embodiments of the present disclosure; Figure 15 is a structural schematic diagram of a top cover assembly provided in some embodiments of the present disclosure; Figure 16 is a FF cross-sectional view of Figure 15 of some embodiments of the present disclosure; Figure 17 is a GG cross-sectional view of Figure 15 of some embodiments of the present disclosure; Figure 18 is a side view of a top cover assembly provided in some embodiments of the present disclosure; Figure 19 is an exploded perspective view of a top cover assembly provided in some embodiments of the present disclosure.

[0145] In the description of the embodiments of this disclosure, for ease of explanation, the direction of arrow X represents the "first direction", the direction of arrow Y represents the "second direction", and the direction of arrow Z represents the "third direction", wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0146] The first aspect of this disclosure provides a battery device, as shown in Figures 2 to 7. The battery device 100 includes: a plurality of battery cells 4 arranged along a first direction X, as shown in Figure 8. Each battery cell 4 includes a housing 42 and a battery cell group 30 located within the housing 42. The battery cell group 30 includes at least two battery cells arranged along the first direction X, as shown in Figure 7. The plurality of battery cells 4 includes a first battery cell 33 and a second battery cell 34 adjacent to each other along the first direction X. The battery cells of the first battery cell 33 include a first battery cell 331 that is closest to the second battery cell 34 along the first direction X, and the battery cells of the second battery cell 34 include a second battery cell 341 that is closest to the first battery cell 33 along the first direction X. At least one heat insulation member 15 is located at least between the first battery cell 331 and the second battery cell 341.

[0147] In some embodiments, as shown in Figures 2, 5 to 7, the battery device 100 includes a plurality of battery cells 4 arranged along a first direction X. The battery device 100 includes two, three, four or more battery cells 4 arranged along the first direction X. The shapes of the battery cells 4 may be the same or different. In a specific embodiment, the shapes of the battery cells 4 may be the same. The plurality of battery cells 4 may be arranged in a manner with their large surfaces facing each other, thereby increasing the number of battery cells 4 in the battery device 100 and improving the space utilization rate within the battery device. The large surface refers to the outer surface with the largest area in the battery cell 4.

[0148] In some embodiments, as shown in FIG8, the battery cell 4 includes a housing 42, the housing 42 having a receiving space, and the battery cell group 30 is located in the receiving space.

[0149] The outer casing 42 can be a rigid casing or a flexible casing. The outer casing 42 can have various shapes, and its shape can be similar to that of the battery cell pack 30. For example, the shape of the outer casing 42 can be square, polygonal, or other shapes.

[0150] In some embodiments, as shown in FIG8, the battery cell group 30 includes at least two battery cells arranged along a first direction X. For example, the battery cell group 30 may include two, three, four or more battery cells. The number of battery cells may be the same or different. In a specific embodiment, in the same battery cell group 30, the battery cells have the same shape and are pouch cells. The battery cells are arranged along the first direction X with their large surfaces facing each other to form the battery cell group 30. The large surface refers to the outer surface with the largest area in the battery cell.

[0151] In some embodiments, as shown in FIG8, multiple battery cells form a battery cell group 30, which is installed in a housing 42 to form a battery unit 4. Multiple battery cells within the same battery unit 4 can be connected in series or parallel via connectors (e.g., sampling electrode 22 and adapter electrode 23 shown in FIG9). The battery unit 4 may also have other components, such as a buffer 7, which can absorb assembly errors in the battery cell group 30 and provide buffer space for thermal expansion of the battery cells. As shown in FIG2, multiple battery units 4 are installed in a housing to form a battery device 100. Multiple battery units within the same battery device can be connected in series or parallel via a busbar 8. The battery device may also have other components, such as a heat insulation component, which can isolate heat between battery units and / or between the battery units and the housing.

[0152] In some embodiments, as shown in Figures 7 and 8, for ease of description, two adjacent battery units 4 along the first direction X are named "first battery unit 33" and "second battery unit 34". There may be more than two battery units 4. For ease of description, any two battery units 4 that are adjacent along the first direction X are named "first battery unit 33" and "second battery unit 34".

[0153] As shown in Figure 7, the first battery unit 33 has a plurality of battery cells arranged along the first direction X. Along the first direction X, the battery cell in the first battery unit 33 that is closest to the second battery unit 34 is the first battery cell 331. The second battery unit 34 has a plurality of battery cells arranged along the first direction X. Along the first direction X, the battery cell in the second battery unit 34 that is closest to the first battery unit 33 is the second battery cell 341. Along the first direction X, a heat insulation member 15 is provided between the first battery cell 331 and the second battery cell 341.

[0154] The heat insulation component 15 is used to isolate the heat between the first battery cell 331 and the second battery cell 341 as much as possible, and thus isolate the heat between the first battery cell 33 and the second battery cell 34 as much as possible.

[0155] This application does not impose specific limitations on the shape of the heat insulation member 15, as long as it can block heat transfer between the first battery cell 331 and the second battery cell 341. In a specific embodiment, the heat insulation member 15 can be plate-shaped, and the plate-shaped heat insulation member is stacked with the battery cell or battery unit along the first direction X.

[0156] Optionally, as shown in FIG7, the heat insulation member 15 may be located inside the housing 42. For example, in the first battery cell 33, the heat insulation member 15 may be located between the first battery cell 331 and the housing wall (e.g., the first housing wall 421) of the housing 42 adjacent to the first battery cell 331 along the first direction X; and / or in the second battery cell 34, the heat insulation member 15 may be located between the second battery cell 341 and the housing wall (e.g., the second housing wall 422) of the housing 42 adjacent to the second battery cell 341 along the first direction X. Of course, as shown in FIG8, in the first battery cell, the heat insulation member 15 may also be located between another battery cell adjacent to the housing wall along the first direction X and the housing wall (e.g., the second housing wall 422 shown in FIG8) of the housing 42 adjacent to it along the first direction X. As shown in Figure 7, the heat insulation component 15 can also be located outside the housing 42, for example, between the housing 42 of the first battery unit 33 (e.g., the first housing wall 421) and the housing 42 of the second battery unit 34 (e.g., the second housing wall 422), or the heat insulation component can be located both inside and outside the housing 42.

[0157] Since the heat insulation member 15 is located between the first battery cell 331 in the first battery cell 33 and the second battery cell 341 in the second battery cell 34, when a battery cell in one of the battery cells experiences thermal runaway, the heat in the casing of that battery cell is blocked by the heat insulation member. This prevents a large amount of heat from being transferred to the casing of that battery cell and then further transferred to other battery cells, thus preventing heat diffusion. Specifically, it prevents heat transferred to the casing from being transferred to the casing along the first direction X to the casing of adjacent battery cells, or heat transferred to the casing from the surface of the casing to the side plate, and then from the side plate to adjacent battery cells. In addition, the heat insulation member can also absorb the group tolerances between battery cells or individual battery cells to a certain extent. Furthermore, having at least two battery cells grouped together and sharing a casing to form a battery cell helps to reduce the space occupied by the casing and improves the volume utilization rate of the battery device.

[0158] In some embodiments, as shown in FIG7 and FIG8, at least one heat insulation member 15 includes at least one first heat insulation member 151, the first heat insulation member 151 being located inside the housing 42 of the first battery unit 33, or the first heat insulation member 151 being located inside the housing 42 of the second battery unit 34, or the number of first heat insulation members 151 being multiple, and the first heat insulation member 151 being provided inside the housing 42 of the first battery unit 33 and the housing 42 of the second battery unit 34.

[0159] Optionally, the first heat insulation element 151 may be provided inside the housing 42 of the first battery unit 33, and along the first direction X, the first heat insulation element 151 is located between the first battery cell 331 and the second battery cell 341; or the first heat insulation element 151 may be provided inside the housing 42 of the second battery unit 34, and along the first direction X, the first heat insulation element 151 is located between the first battery cell 331 and the second battery cell 341; or both the first heat insulation element 151 may be provided inside the housing 42 of the first battery unit 33 and the housing 42 of the second battery unit 34, and along the first direction X, both heat insulation elements are located between the first battery cell 331 and the second battery cell 341.

[0160] Since the first heat insulation element 151 is located inside the housing of the first battery cell 33 and / or the housing of the second battery cell 34, it can block heat transfer from the inside of the battery cell that has experienced thermal runaway to the housing, thereby reducing the heat transfer path between battery cells. This helps to reduce the probability that the battery cell with a higher internal temperature will transfer heat to other battery cells through the housing, and helps to suppress heat diffusion, which can reduce the risk of large-scale thermal runaway of the battery device.

[0161] In some embodiments, as shown in FIG7, the first battery cell 33 has a first housing wall 421 located between the first battery cell 331 and the second battery cell 341, the second battery cell 34 has a second housing wall 422 located between the first battery cell 331 and the second battery cell 341, a first heat insulation member 151 is connected between the first battery cell 331 and the first housing wall 421, and / or, the first heat insulation member 151 is connected between the second battery cell 341 and the second housing wall 422.

[0162] In some embodiments, a battery cell 4 includes a housing 42 and a plurality of battery cells housed in the housing 42. The plurality of battery cells are arranged along a first direction X, for example, in a manner in which their large surfaces face each other. The battery cells located at the ends of the first direction X face the housing wall. A first heat insulation member 151 is installed between the battery cells at those ends and the housing wall. For example, a first heat insulation member 151 is installed between the battery cells at both ends of the first direction X and the two housing walls respectively.

[0163] For two adjacent battery cells, such as the first battery cell 33 and the second battery cell 34, along the first direction X, the first battery cell 33 has a first battery cell 331 located at the end of a plurality of arranged battery cells and a first housing wall 421 adjacent to the first battery cell 331. The second battery cell 34 has a second battery cell 341 located at the end of a plurality of arranged battery cells and a second housing wall 422 adjacent to the second battery cell 341. The first housing wall 421 and the second housing wall 422 are close to or in contact with each other, that is, the first housing wall 421 and the second housing wall 422 are located at the first battery cell 33. 1. Between the first battery cell 331 and the second battery cell 341, the first heat insulation member 151 is located between the first battery cell 331 and the first housing wall 421; or, the first heat insulation member 151 is located between the second battery cell 341 and the second housing wall 422; or, the first heat insulation member 151 is arranged between the first battery cell 331 and the first housing wall 421, and between the second battery cell 341 and the second housing wall 422, respectively. That is, along the first direction X, the first battery cell 331, the first heat insulation member 151, the first housing wall 421, the second housing wall 422, the first heat insulation member 151, and the second battery cell 341 are arranged in sequence. Optionally, a second heat insulation member 152 can also be arranged between the first housing wall 421 and the second housing wall 422 (detailed below).

[0164] Optionally, the first heat insulation component 151 may be connected only to the battery cell, or it may be connected only to the housing wall. Alternatively, the first heat insulation component 151 may be connected to both the battery cell and the housing wall. The connection method may be adhesive bonding. For example, structural adhesive may be applied to the surface of the first heat insulation component 151 facing the first housing wall 421 and / or facing the first battery cell 331. After placing the first heat insulation component 151 inside the housing 42 and bonding it to the first housing wall 421, the first battery cell 331 may be placed inside the housing 42 and bonded to the first heat insulation component 151. Of course, structural adhesive may also be applied to the inner surface of the first housing wall 421 and / or the outer surface of the first battery cell 331 facing the first heat insulation component 151.

[0165] Since the first heat insulation member 151 is connected between the first housing wall 421 and / or the second housing wall 422 and the battery cell, it not only determines the relative position between the heat insulation member and the battery cell, reliably blocking heat transfer to the outer casing and reducing the heat transfer path between battery cells, but also reduces the internal space of the battery cell casing by allowing the first heat insulation member to be sandwiched between the housing wall and the battery cell, thus reducing space waste and improving the volume utilization rate of the battery device.

[0166] In some embodiments, as shown in FIG7, each battery cell includes a main body portion 35, a sealing portion 36, and a transition portion 37 connecting the main body portion 35 and the sealing portion 36. As shown in FIG7, FIG8 and FIG12, in the same projection plane perpendicular to the first direction X, the projection of the first heat insulation member 151 along the first direction X at least partially overlaps with the projection of the main body portion 35 of the battery cell along the first direction X, and the projection area of ​​the main body portion 35 accounts for 70% to 100% of the projection area of ​​the first heat insulation member 151.

[0167] In some embodiments, as shown in Figures 7 and 12, the portion within the dashed box O1 is the main body 35, the portion within the dashed box O2 is the transition portion 37, and the portion within the dashed box O3 is the sealing portion 36. Taking a pouch battery cell as an example, the main body 35 refers to the portion where the electrode sheets (positive and negative electrode sheets) and the sealing bag overlap along the first direction, which is usually the thickest part of the pouch battery cell (the thickness direction is consistent with the first direction); the sealing portion refers to the portion where the sealing bag is attached to the sealing edge area, which is usually formed around the main body; the transition portion refers to the portion where the transition area between the main body 35 and the sealing portion is located, which is usually a thickness variation area, with the thickness decreasing as it approaches the sealing portion.

[0168] In some embodiments, the main body 35, the transition portion 37, and the sealing portion 36 are connected in sequence to form a battery cell.

[0169] As shown in Figures 7, 8 and 12, along the first direction X, the first heat insulation member 151 at least partially overlaps with the main body 35, and along the first direction X, the main body 35 is located within the range of the first heat insulation member 151.

[0170] Optionally, in the same projection plane perpendicular to the first direction X, a portion of the projection of the first heat insulation member 151 along the first direction X may overlap with a portion of the projection of the main body 35 along the first direction X; a portion of the projection of the first heat insulation member 151 along the first direction X may overlap with the entire projection of the main body 35 along the first direction X; the entire projection of the first heat insulation member 151 along the first direction X may overlap with the entire projection of the main body 35 along the first direction X; or the entire projection of the first heat insulation member 151 along the first direction X may overlap with a portion of the projection of the main body 35 along the first direction X.

[0171] In some embodiments, along the first direction X, the area of ​​the overlapping portion of the first heat insulation member 151 and the main body 35 accounts for 70% to 100% of the area of ​​the first heat insulation member 151 perpendicular to the first direction X.

[0172] Optionally, the area of ​​the projection of the main body 35 perpendicular to the first direction X can account for 70%, 75%, 80%, 85%, 90%, 95%, or 100% of the area of ​​the projection of the first heat insulation member 151 perpendicular to the first direction X, or other values ​​within the above range.

[0173] Therefore, it can not only reliably block heat transfer to the outer casing 42 and reduce the heat transfer path between battery cells, but also suppress the size of the first heat insulation member 151 and reduce the impact of the first heat insulation member 151 on the weight and volume of the battery cells.

[0174] In some embodiments, as shown in FIG7, each battery cell includes a main body portion 35, a sealing portion 36, and a transition portion 37 connecting the main body portion 35 and the sealing portion. As shown in FIG8, the first heat insulation member 151 includes a first heat insulation layer 1511 and a first encapsulation member 1512 covering the first heat insulation layer 1511. In the same projection plane perpendicular to the first direction X, the projection of the first heat insulation layer 1511 along the first direction X at least partially overlaps with the projection of the main body portion 35 of the battery cell along the first direction X. The projected area of ​​the main body portion 35 accounts for 70% to 100% of the projected area of ​​the first heat insulation layer 1511.

[0175] In some embodiments, as shown in FIG8, the first heat insulation member 151 is composed of a first heat insulation layer 1511 and a first encapsulation member 1512 for encapsulating the first heat insulation layer 1511. The first heat insulation layer 1511 serves to isolate the heat between battery cells. The first heat insulation layer 1511 can be made of materials such as aerogel, ceramic, or rubber. The first encapsulation member 1512 is used to encapsulate the first heat insulation layer 1511 and serves to shape it.

[0176] As shown in Figures 7, 8 and 12, along the first direction X, the first heat insulation layer 1511 at least partially overlaps with the main body 35, and the main body 35 is located within the range of the first heat insulation layer 1511 in a plane perpendicular to the first direction X (i.e., the plane formed by the second direction Y and the third direction Z).

[0177] Optionally, in the same projection plane perpendicular to the first direction X, a portion of the projection of the first heat insulation layer 1511 along the first direction X may overlap with a portion of the projection of the main body 35 along the first direction X; a portion of the projection of the first heat insulation layer 1511 along the first direction X may overlap with the entire projection of the main body 35 along the first direction X; the entire projection of the first heat insulation layer 1511 along the first direction X may overlap with the entire projection of the main body 35 along the first direction X; or the entire projection of the first heat insulation layer 1511 along the first direction X may overlap with a portion of the projection of the main body 35 along the first direction X.

[0178] In some embodiments, along the first direction X, the area of ​​the overlapping portion of the first heat insulation layer 1511 and the main body portion 35 accounts for 70% to 100% of the area of ​​the first heat insulation layer 1511 perpendicular to the first direction X.

[0179] Optionally, the area of ​​the projection of the main body 35 perpendicular to the first direction X can account for 70%, 75%, 80%, 85%, 90%, 95%, or 100% of the area of ​​the projection of the first heat insulation layer 1511 perpendicular to the first direction X, or other values ​​within the above range.

[0180] Since the first heat insulation component 151 includes a first heat insulation layer 1511 and a first encapsulation component 1512 covering the first heat insulation layer 1511, it is advantageous to use heat insulation materials without a fixed shape, such as liquid or gel. Since the area of ​​the projection of the main body 35 perpendicular to the first direction accounts for 70% to 100% of the area of ​​the projection of the first heat insulation layer 1511 perpendicular to the first direction, it can not only reliably block heat transfer to the outer casing and reduce the heat transfer path between battery cells, but also reduce the impact of setting the first heat insulation component on the weight and volume of the battery cells.

[0181] In some embodiments, as shown in FIG7, the thickness D1 of the first heat insulation member 151 is in the range of 1 mm to 10 mm along the first direction X.

[0182] The thickness of the first heat insulation component 151 refers to the distance between the two edges of the heat insulation portion (e.g., the first heat insulation layer 1511 and the first encapsulation component 1512 that wraps the first heat insulation layer 1511) along the first direction X. The thickness D1 of the first heat insulation component 151 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc., or other values ​​within the above range.

[0183] The material and thickness of the first heat insulation element 151 can be selected based on the heat that can be released by the battery cell adjacent to the first heat insulation element 151 along the first direction X. When the material of the first heat insulation element 151 is the same, the higher the heat that can be released by the battery cell adjacent to the first heat insulation element 151 along the first direction X, the thicker the first heat insulation element 151 can be along the first direction X. For example, the first heat insulation element 151 can be a nano-aerogel heat insulation element or a ceramic heat insulation element. The thickness D1 of the first heat insulation element 151 along the first direction X can be from 2 mm to 5 mm.

[0184] A first insulation component with appropriate thickness can balance the insulation effect with the impact on the weight and volume of the battery cell.

[0185] In some embodiments, as shown in FIG2, FIG4 and FIG8, the battery device 100 further includes a first end restrictor 5 and a second end restrictor 6 disposed opposite to each other along a first direction X. A plurality of battery cells 4 are arranged between the first end restrictor 5 and the second end restrictor 6 along the first direction X. A first heat insulation member 151 is also provided between the first end restrictor 5 and the battery cells adjacent to the first end restrictor 5 along the first direction X, and / or between the second end restrictor 6 and the battery cells adjacent to the second end restrictor 6 along the first direction X.

[0186] In some embodiments, the battery device 100 includes a plurality of battery cells 4 arranged along a first direction X. A first end limiting member 5 and a second end limiting member 6 are respectively provided at both ends of the plurality of battery cells along the first direction X. The first end limiting member 5 and the second end limiting member 6 are used to limit the position of the plurality of battery cells, particularly the position of the plurality of battery cells along the first direction X. The first end limiting member 5 may refer to a battery end plate or a battery housing sidewall (not shown), or both a battery end plate and a battery housing sidewall (not shown). The second end limiting member 6 may refer to a battery end plate or a battery housing (not shown), or both a battery end plate and a battery housing sidewall (not shown).

[0187] In some embodiments, along the first direction X, there is a first heat insulation member 151 between the first end restraint 5 and the adjacent battery cell, wherein the first heat insulation member 151 is located within the housing 42.

[0188] In some embodiments, along the first direction X, there is a first heat insulation member 151 between the second end restrictor 6 and the adjacent battery cell, wherein the first heat insulation member 151 is located within the housing 42.

[0189] In some embodiments, along the first direction X, a first heat insulation member 151 is provided between the second end restrictor 6 and the adjacent battery cell, and the first heat insulation member 151 is located within the housing 42.

[0190] The second heat insulation member 152 located between battery cells can be provided not only between adjacent battery cells, but also between a battery cell and an adjacent end restrictor. This can further block heat from being transferred from the casing of a battery cell that has experienced thermal runaway to the surrounding area, further reliably reduce the heat transfer path, reduce the probability of heat diffusion, and also reduce the possibility of heat being further transferred to other functional components through the end restrictor, causing battery device malfunctions.

[0191] In some embodiments, as shown in Figures 2 and 7, at least one heat insulation member includes a second heat insulation member 152, which is connected between the first battery cell 33 and the second battery cell 34 along a first direction X.

[0192] Along the first direction X, a second heat insulation member 152 is provided between the first battery cell 33 and the second battery cell 34, and the second heat insulation member 152 is connected to the first battery cell 33 and / or the second battery cell 34. The second heat insulation member can also reduce the grouping tolerance between battery cells.

[0193] Optionally, the second heat insulation component 152 may be connected only to the first battery unit 33, or only to the second battery unit 34, or connected to both the first battery unit 33 and the second battery unit 34. The connection method can be adhesive bonding, for example, by applying structural adhesive to the surface of the second heat insulation component 152 facing the first battery unit 33 and / or facing the second battery unit 34. Alternatively, structural adhesive can be applied to the surface of the first battery unit 33 facing the second heat insulation component 152, and / or to the surface of the second battery unit 34 facing the second heat insulation component 152. The second heat insulation component 152, the first battery unit 33, and the second battery unit 34 can be assembled and placed into the housing of the battery device, or the second heat insulation component 152, the first battery unit 33, and the second battery unit 34 can be placed into the housing of the battery device in sequence.

[0194] In one specific embodiment, as shown in FIG7, along the first direction X, a first heat insulation member 151 and a second heat insulation member 152 are provided between the first battery cell 331 and the second battery cell 341. The first heat insulation member 151 is located inside the housing 42 of the first battery cell 33, and / or the first heat insulation member 151 is located inside the housing 42 of the second battery cell 34, and the second heat insulation member 152 is located outside the housing 42.

[0195] The material of the second heat insulation component 152 can be the same as that of the first heat insulation component 151, or it can be different.

[0196] Since the second heat insulation element 152 is connected between the first battery cell 33 and the second battery cell 34, it can further prevent heat from being transferred from the casing of one battery cell to the casing of another, reliably reducing the heat transfer path between battery cells. This helps to reduce the probability that a higher-temperature battery cell will transfer heat to its adjacent battery cell, thereby reducing the risk of large-scale thermal runaway in the battery device. The second heat insulation element can also reduce the packing tolerance between battery cells.

[0197] In some embodiments, as shown in Figures 2 and 7, in the same projection plane perpendicular to the first direction X, the projection of the second heat insulation member 152 along the first direction X at least partially overlaps with the projection of the outer casing 42 of the battery cell along the first direction X, and the projected area of ​​the outer casing 42 accounts for 70% to 100% of the projected area of ​​the second heat insulation member 152.

[0198] As shown in Figures 2 and 7, along the first direction X, the second heat insulation member 152 at least partially overlaps with the outer shell 42, and the outer shell 42 is located within the range of the second heat insulation member 152 in a plane perpendicular to the first direction X (i.e., the plane formed by the second direction Y and the third direction Z).

[0199] Optionally, in the same projection plane perpendicular to the first direction X, a portion of the projection of the second heat insulation element 152 along the first direction X may overlap with a portion of the projection of the outer shell 42 along the first direction X; a portion of the projection of the second heat insulation element 152 along the first direction X may overlap with the entire projection of the outer shell 42 along the first direction X; the entire projection of the second heat insulation element 152 along the first direction X may overlap with the entire projection of the outer shell 42 along the first direction X; or the entire projection of the second heat insulation element 152 along the first direction X may overlap with a portion of the projection of the outer shell 42 along the first direction X.

[0200] In some embodiments, along the first direction X, the area of ​​the overlap between the second thermal insulation member 152 and the outer shell 42 accounts for 70% to 100% of the area of ​​the second thermal insulation member 152 perpendicular to the first direction X.

[0201] Optionally, the area of ​​the projection of the outer shell 42 perpendicular to the first direction X can account for 70%, 75%, 80%, 85%, 90%, 95%, or 100% of the area of ​​the projection of the second heat insulation member 152 perpendicular to the first direction X, or other values ​​within the above range.

[0202] Therefore, it can not only reliably block heat transfer between adjacent battery cells and reduce the heat transfer path between battery cells, but also reduce the impact of setting the second heat insulation component 152 on the weight and volume of the battery device, which is conducive to improving the volume utilization rate of the battery device.

[0203] In some embodiments, as shown in Figures 2 and 7, the second heat insulation member 152 includes a second heat insulation layer 1521 and a second encapsulation member 1522 covering the heat insulation layer. In the same projection plane perpendicular to the first direction X, the projection of the second heat insulation layer 1521 along the first direction X at least partially overlaps with the projection of the outer casing 42 of the battery cell along the first direction X. The projected area of ​​the outer casing 42 accounts for 70% to 100% of the projected area of ​​the second heat insulation layer.

[0204] In some embodiments, as shown in FIG7, the second heat insulation member 152 is composed of a second heat insulation layer 1521 and a second encapsulation member 1522 encapsulating the second heat insulation layer 1521. The second heat insulation layer 1521 serves to isolate the heat between battery cells. The second heat insulation layer 1521 can be made of materials such as aerogel, heat insulation material, or foam material. The second encapsulation member 1522 is used to encapsulate the second heat insulation layer 1521 and serves to cover and shape it.

[0205] As shown in Figures 2 and 7, along the first direction X, the second heat insulation layer 1521 at least partially overlaps with the outer shell 42, and along the first direction X, the outer shell 42 is located within the range of the second heat insulation layer 1521.

[0206] Optionally, in the same projection plane perpendicular to the first direction X, a portion of the projection of the second heat insulation layer 1521 along the first direction X may overlap with a portion of the projection of the outer shell 42 along the first direction X; a portion of the projection of the second heat insulation layer 1521 along the first direction X may overlap with the entire projection of the outer shell 42 along the first direction X; the entire projection of the second heat insulation layer 1521 along the first direction X may overlap with the entire projection of the outer shell 42 along the first direction X; or the entire projection of the second heat insulation layer 1521 along the first direction X may overlap with a portion of the projection of the outer shell 42 along the first direction X.

[0207] In some embodiments, along the first direction X, the area of ​​the overlap between the second heat insulation layer 1521 and the outer shell 42 accounts for 70% to 100% of the area of ​​the second heat insulation layer 1521 perpendicular to the first direction X.

[0208] Optionally, the area of ​​the projection of the outer shell 42 perpendicular to the first direction X can account for 70%, 75%, 80%, 85%, 90%, 95% or 100% of the area of ​​the projection of the first heat insulation layer 1511 perpendicular to the first direction X, or other values ​​within the above range.

[0209] Since the second heat insulation component includes a second heat insulation layer and a second encapsulation component covering the second heat insulation layer, it is advantageous to use heat insulation materials without a fixed shape, such as liquid or gel states. Since the area of ​​the outer shell projected perpendicular to the first direction accounts for 70% to 100% of the area of ​​the second heat insulation component projected perpendicular to the first direction, it can not only reduce the heat transfer path between battery cells and reduce the transfer of heat from the internally hot battery cells to adjacent battery cells through the outer shell, thereby further reducing the risk of large-scale thermal runaway of the battery device, but also reduce the impact of setting the second heat insulation component on the weight and volume of the battery device, which is conducive to improving the volume utilization rate of the battery device.

[0210] In some embodiments, as shown in FIG7, the thickness D2 of the second heat insulation member 152 is in the range of 1 mm to 10 mm along the first direction X.

[0211] The thickness of the second heat insulation component 152 refers to the distance between the two edges of the part of the second heat insulation component 152 that performs the heat insulation function (such as the second heat insulation layer 1521 and the second encapsulation component 1522 that wraps the second heat insulation layer 1521) along the first direction X. The thickness D2 of the second heat insulation component 152 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc., or other values ​​within the above range.

[0212] The material and thickness of the second heat insulation element 152 can be selected based on the amount of heat that can be released by the battery cell adjacent to the second heat insulation element 152 along the first direction X. When the material of the second heat insulation element 152 is the same, the higher the amount of heat that can be released by the battery cell adjacent to the second heat insulation element 152 along the first direction X, the thicker the second heat insulation element 152 can be along the first direction X. For example, the second heat insulation element 152 can be a nano-aerogel heat insulation element or a ceramic heat insulation element. The thickness D2 of the second heat insulation element 152 along the first direction X can be from 2 mm to 5 mm.

[0213] A second heat insulation component with appropriate thickness can balance the heat insulation effect with the impact on the weight and volume of the battery cell.

[0214] In some embodiments, as shown in Figures 2 and 7, the battery device further includes a first end restrictor 5 and a second end restrictor 6 disposed opposite to each other along a first direction X. A plurality of battery cells are arranged between the first end restrictor 5 and the second end restrictor 6 along the first direction X. A second heat insulation member 152 is also provided between the first end restrictor 5 and the battery cells adjacent to the first end restrictor 5 along the first direction X, and / or between the second end restrictor 6 and the battery cells adjacent to the second end restrictor 6 along the first direction X.

[0215] In some embodiments, a second heat insulation member 152 is provided between the first end restraint 5 and the adjacent battery cell 4 along the first direction X, wherein the second heat insulation member 152 is located outside the housing 42.

[0216] In some embodiments, along the first direction X, there is a second heat insulation member 152 between the second end restraint member 6 and the adjacent battery cell 4, wherein the second heat insulation member 152 is located outside the housing 42.

[0217] In some embodiments, along the first direction X, a second heat insulation member 152 is provided between the second end restrictor 6 and the adjacent battery cell 4, and the second heat insulation member 152 is located outside the housing 42.

[0218] The second heat insulation element located between battery cells can be provided not only between adjacent battery cells, but also between a battery cell and an adjacent end restrictor. This can further block heat from being transferred from the casing of a battery cell that has experienced thermal runaway to the surrounding area, further reliably reduce the heat transfer path, reduce the probability of heat diffusion, and also reduce the possibility of heat being further transferred to other functional components through the end restrictor, causing battery device malfunctions.

[0219] In some embodiments, as shown in FIG2 and FIG7, at least one heat insulation member 15 includes a second heat insulation member 152, which is connected between the first battery cell 33 and the second battery cell 34 along the first direction X, between the first end restrictor 5 and the battery cell 4 adjacent to the first end restrictor 5 along the first direction X, and between the second end restrictor 6 and the battery cell 4 adjacent to the second end restrictor 6 along the first direction X.

[0220] In some embodiments, along the first direction X, there is a second heat insulation member 152 between two adjacent battery cells 4, and there is a second heat insulation member 152 between the second end restrictor 6 and the adjacent battery cell 4 therewith, and the second heat insulation member 152 is located outside the housing 42.

[0221] This can completely block the heat from the thermally runaway battery cell from being transferred to the surrounding area along the first direction, thereby reliably reducing the heat transfer path from the thermally runaway battery cell and thus reliably reducing the risk of large-scale thermal runaway in the battery device.

[0222] In some embodiments, as shown in FIG2, the battery device further includes a housing having a first housing wall (not shown) and a second housing wall (not shown) disposed opposite to each other along a first direction X, a first end limiting member 5 including the first housing wall (not shown), and a second end limiting member 6 including the second housing wall (not shown); or, the battery device further includes a first end plate 52 and a second end plate 62 disposed opposite to each other along a first direction X, the first end limiting member 5 including the first end plate 52, and the second end limiting member 6 including the second end plate 62.

[0223] In some embodiments, the first end limiting member 5 may refer to the first housing wall, or it may refer to both the first housing wall and the first end plate 52; the second end limiting member 6 may refer to the second housing wall, or it may refer to both the second housing wall and the second end plate 62. The first end plate 52 and / or the second end plate 62 may have functions such as fixing and protecting the battery cell, conducting electricity, dissipating heat, and sealing. For example, the first end plate 52 and / or the second end plate 62 may be a water-cooled plate.

[0224] In a battery device, regardless of whether the end of the battery cell group arranged along the first direction is provided with an end plate or a housing wall, the adverse effects of thermal runaway battery cells on surrounding battery cells or other components can be reduced by providing a first heat insulation component and / or a second heat insulation component.

[0225] In some embodiments, the insulating material of the insulating component includes at least one of aerogel, ceramic insulating material, and foamed material; and / or, the thermal conductivity of the insulating material is in the range of 0.03 W / (m·K) to 0.10 W / (m·K).

[0226] Here, the heat insulation components include a first heat insulation component 151 and a second heat insulation component 152. That is, both the first heat insulation component 151 and the second heat insulation component 152 can be made of the aforementioned heat insulation material. However, the materials of the first heat insulation component 151 and the second heat insulation component 152 may not be the same. In addition, their external dimensions and thicknesses may be the same or different.

[0227] This helps to give the insulation component good heat insulation properties, and more effectively block heat transfer between battery cells and / or between battery cells and other surrounding components.

[0228] In some embodiments, as shown in Figures 2 to 8, the heat insulation member 15 includes a first heat insulation member 151 located inside the housing 42 of the battery cell, and a second heat insulation member 152 located outside the housing 42 of the battery cell and in contact with the surface of the housing 42. The first heat insulation member 151 and the second heat insulation member 152 are made of the same heat insulation material and / or have the same thickness.

[0229] In some embodiments, as shown in FIG7, the heat insulation component includes a first heat insulation component 151 and a second heat insulation component 152, wherein the materials of the first heat insulation component 151 and the second heat insulation component 152 may be the same or different, the dimensions of the first heat insulation component 151 and the second heat insulation component 152 may be the same or different, and further, the thickness of the first heat insulation component 151 and the second heat insulation component 152 along the first direction X may be the same or different.

[0230] In some embodiments, the first heat insulation member 151 is located between adjacent battery cells along the first direction X, and the adjacent battery cells are located in different battery cells 4 (e.g., the first battery cell 33 and the second battery cell 34), and the first heat insulation member 151 is located inside the housing of the battery cell 4. Of course, along the first direction X, the first heat insulation member 151 may also be located between the battery cell and the end restrictor (the first end restrictor 5 and / or the second end restrictor 6).

[0231] In some embodiments, the second heat insulation member 152 is located between adjacent battery cells along the first direction X, and the second heat insulation member is located outside the housing. Of course, along the first direction X, the second heat insulation member can also be located between the battery cell 4 and the end restrictor (first end restrictor 5 and / or second end restrictor 6).

[0232] This allows for the production of heat insulation components 15 of the same specifications, which simplifies the manufacturing process of the heat insulation components, improves production efficiency, and reduces production costs. In addition, the first heat insulation component 151 and the second heat insulation component 152 can be appropriately determined based on the size of the battery cell, the size of a single battery unit, the assembly size of the battery unit group, and the desired heat insulation effect.

[0233] In some embodiments, as shown in Figures 7 and 8, each battery cell 4 further includes a buffer 7, which is located between adjacent battery cells along the first direction X in the same battery cell 4.

[0234] The buffer 7 is used to absorb the assembly error of the battery cell group 30 during the assembly of the battery cell 4, and can also provide buffer space for the thermal expansion of the battery cell, so as to avoid damage to the battery cell due to lack of expansion space.

[0235] This application does not specifically limit the shape of the buffer member 7, as long as it can provide buffer space for the expansion of the battery cell. In a specific embodiment, the buffer member 7 can be plate-shaped, and the plate-shaped buffer member 7 and the battery cell are stacked together along the first direction X.

[0236] In some embodiments, in the same battery cell, along the first direction X, the buffer 7 is located between adjacent battery cells.

[0237] Since the buffer is located between adjacent battery cells, it can absorb assembly errors between battery cells, provide buffer space for battery cell expansion, and limit excessive expansion of battery cells, which helps to extend the service life of battery cells.

[0238] In some embodiments, as shown in Figures 7, 8 and 12, each battery cell includes a main body portion 35, a sealing portion 36 and a transition portion 37 connecting the main body portion 35 and the sealing portion 36. In the same projection plane perpendicular to the first direction X, the projection of the buffer 7 along the first direction X and the projection of the adjacent main body portion 35 along the first direction X at least partially overlap, and the projection area of ​​the main body portion 35 accounts for 70% to 100% of the projection area of ​​the buffer 7.

[0239] Along the first direction X, the buffer 7 at least partially overlaps with the main body 35, and in a plane perpendicular to the first direction X (e.g., the plane containing the second direction Y and the third direction Z), the main body 35 is located within the range of the buffer 7.

[0240] Optionally, in the same projection plane perpendicular to the first direction X, the partial projection of the buffer 7 along the first direction X may overlap with the partial projection of the main body 35 along the first direction X, the partial projection of the buffer 7 along the first direction X may overlap with the entire projection of the main body 35 along the first direction X, the entire projection of the buffer 7 along the first direction X may overlap with the entire projection of the main body 35 along the first direction X, or the entire projection of the buffer 7 along the first direction X may overlap with the partial projection of the main body 35 along the first direction X.

[0241] In some embodiments, along the first direction X, the area of ​​the overlapping portion of the buffer member 7 and the main body 35 accounts for 70% to 100% of the area of ​​the buffer member 7 perpendicular to the first direction X.

[0242] Optionally, the area of ​​the projection of the main body 35 perpendicular to the first direction X can account for 70%, 75%, 80%, 85%, 90%, 95%, or 100% of the area of ​​the projection of the buffer 7 perpendicular to the first direction X, or other values ​​within the above range.

[0243] Since the area of ​​the projection of the main body 35 perpendicular to the first direction X accounts for 70% to 100% of the area of ​​the projection of the buffer 7 perpendicular to the first direction, it can not only absorb the assembly error between battery cells and provide buffer space for the expansion of battery cells, but also reliably limit the excessive expansion of battery cells. In addition, a buffer of appropriate size is beneficial to reduce the impact of an excessively large buffer on the volume and weight of the battery cell.

[0244] In some embodiments, as shown in FIG7, in the same battery cell, the ratio of the thickness D3 of the buffer 7 to the thickness D4 of the individual battery cell along the first direction X is in the range of 1% to 10%.

[0245] The thickness D3 of the buffer 7 refers to the distance between the two edges of the buffer 7 along the first direction X.

[0246] The thickness D4 of the battery cell refers to the maximum thickness of the battery cell along the first direction X, such as the distance between the two edges of the main body 35 of the battery cell along the first direction X.

[0247] In some embodiments, in the same battery cell, the ratio of the thickness D3 of the buffer 7 along the first direction X to the thickness D4 of the individual battery cell (e.g., the first battery cell 331 or the second battery cell 341 shown in FIG. 8) along the first direction X is in the range of 1% to 10%. Wherein, in the same battery cell, the thicknesses of the first battery cell 331 and the second battery cell 341 along the first direction X may be the same or different, and thus, the ratio of the thickness D3 of the buffer 7 along the first direction X to the thickness of each battery cell adjacent to it along the first direction X in the same battery cell may also be the same or different.

[0248] Optionally, in the same battery cell, along the first direction X, the ratio of the thickness D3 of the buffer 7 to the thickness D4 of the individual battery cell along the first direction X can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%, or other values ​​within the above range.

[0249] This effectively absorbs assembly errors between battery cells, provides suitable buffer space for battery cell expansion and limits excessive expansion, and also saves materials, reduces the weight of battery devices and lowers costs.

[0250] In some embodiments, the material of the cushioning element 7 includes at least one of foam and silicone rubber.

[0251] Foam can be made of polyurethane foam or microporous foamed polypropylene, or other materials.

[0252] Foam and silicone rubber have good cushioning and protection properties and resistance to compression set. They can also provide support even at high temperatures, enabling the cushioning components to function reliably.

[0253] In some embodiments, the battery cell is a pouch cell.

[0254] By encasing the pouch cell into the casing, the pouch cells, which are originally difficult to arrange in groups due to their easy deformation, can be assembled into groups as neatly as prismatic cells, improving assembly ease. In addition, pouch cells are characterized by difficulty in controlling the ejection direction in the event of thermal runaway. However, by encasing the pouch cells in the casing, the ejection direction in the event of thermal runaway can be controlled by controlling the ejection direction of the casing, thereby reducing the risk of thermal runaway cells causing thermal propagation.

[0255] In this embodiment, the encapsulation film is an aluminum-plastic film. Of course, those skilled in the art will understand that in some other embodiments, the pouch cell may also be encapsulated in a casing made of any other suitable material, such as a composite polyester film.

[0256] Therefore, placing the pouch battery cells inside the casing 42 can provide good protection for the pouch battery cells, reduce the possibility of damage to the pouch battery cells, improve the service life of the pouch battery cells, and reduce the possibility of thermal runaway of the pouch battery cells.

[0257] This is beneficial to improving the efficiency of assembling pouch battery cells into battery devices, and also helps to reduce the risk of thermal runaway of pouch battery cells and the risk of thermal runaway of the battery devices assembled from them.

[0258] In some embodiments, as shown in Figures 8 and 10, the housing 42 has an opening 423 and a pressure relief port 424 located on different sides; the battery cell also includes a top cover assembly 20 disposed on the housing 42 and closing the opening 423 and a pressure relief cover 40 disposed on the housing and closing the pressure relief port 424, the pressure relief cover 40 being configured to open the pressure relief port 424 in the event of thermal runaway of the battery cell.

[0259] In some embodiments, as shown in FIG9, the top cover assembly 20 includes a top cover body 21 and a conductive sampling electrode 22 and a transfer electrode 23 disposed on the top cover body 21. In the same battery cell, the pouch battery cell is connected to the sampling electrode 22 and the transfer electrode 23.

[0260] The top cover assembly 20 is disposed on the housing 42 and closes the opening 423 to enclose the battery cell assembly 30 within the housing space defined by the housing 42.

[0261] As shown in Figure 8, a pressure relief port 424 is formed on one side of the outer casing 42, and the pressure relief port 424 is connected to the receiving space. The pressure relief port 424 is an opening 423 for the gas and emissions in the receiving space to escape.

[0262] In the event of thermal runaway in a single pouch cell, the generated gases and emissions can be discharged through the pressure relief port 424, thereby depressurizing the containment space. Furthermore, the gases and emissions generated during thermal runaway are guided by the pressure relief port 424, preventing them from scattering and allowing for directional emission of thermal runaway from the pouch cell. This makes the emission direction of the high-temperature emissions during thermal runaway controllable, reducing the possibility of these emissions affecting other battery cells or other components within the battery assembly, and improving the reliability of the battery cells.

[0263] As shown in Figures 8 and 10, the pressure relief cover 40 is a sealing structure that covers the pressure relief port 424. The pressure relief cover 40 is configured to open the pressure relief port 424 in the event of thermal runaway of the battery cell.

[0264] In this way, without thermal runaway, the pressure relief cover 40 closes the pressure relief port 424, thereby reducing the possibility of objects falling out of the containment space and reducing the possibility of external debris entering the containment space, thus further improving the reliability of the battery cell.

[0265] In this embodiment, the pressure relief port 424 and the opening 423 are located on different sides of the housing. That is, the pressure relief port 424 can be located on any other side of the housing 42, as long as it is on a different side from the opening 423. This enables thermoelectric separation and improves the reliability of the battery cell.

[0266] Thermoelectric separation refers to the arrangement of electrical connections and pressure relief devices within a battery cell to prevent thermal runaway from causing phenomena such as arcing, short circuits, and insulation failure. This avoids further thermal runaway to surrounding battery cells and reduces the risk of heat propagation. In short, thermoelectric separation is a measure to mitigate the severity of thermal runaway within a battery cell, preventing serious consequences such as fires and explosions caused by abnormal conditions.

[0267] In this embodiment of the disclosure, in the event of thermal runaway of a single pouch battery cell, pressure can be released through the pressure relief port 424 of the battery cell, thereby making it difficult for high-temperature emissions to come into contact with the top cover assembly 20 covering the opening 423. This facilitates thermoelectric separation, reduces the risk of emissions spreading through the top cover assembly 20 to the top cover assemblies 20 of other surrounding battery cells, and thus reduces the risk of damage to electrical components such as electrical connectors and busbars on the top cover assembly 20. This further reduces the risk of thermal diffusion and improves the reliability of the battery cell.

[0268] Due to the flexible encapsulation structure of pouch cell batteries, it is more difficult to control the ejection direction during thermal runaway, i.e., it is more difficult to achieve directional ejection. Moreover, pouch cell batteries are more susceptible to damage from external impacts and collisions, further increasing the risk of thermal runaway.

[0269] In addition, when a single pouch battery cell experiences thermal runaway, the high-temperature emissions can be directionally ejected through the pressure relief port 424 of the outer casing 42. This makes the ejection direction during thermal runaway of the pouch battery cell controllable, reducing the risk of thermal diffusion and improving the reliability of the pouch battery cell.

[0270] Of course, those skilled in the art should understand that the type of battery cell is not limited to pouch cell, but can be any other type of battery cell.

[0271] In some embodiments, as shown in FIG8, the top cover assembly 20 is located on one side of the battery cell 4, and the pressure relief port 424 is located on the other side opposite to the top cover assembly 20.

[0272] In this embodiment, the pressure relief port 424 is located on the opposite side of the opening 423 along the second direction Y. In other words, the opening 423 is located on one side of the housing 42 along the second direction Y, and the pressure relief port 424 is located on the other side of the housing 42 along the second direction Y. This can effectively achieve thermoelectric separation and improve the reliability of the battery cell.

[0273] In some embodiments, as shown in FIG8, each battery cell group includes a first pouch battery cell (e.g., the first battery cell 331 shown in FIG8) and a second pouch battery cell (e.g., the second battery cell 341 shown in FIG8). As shown in FIG9 and FIG19, the top cover assembly 20 includes a top cover body 21 and a sampling electrode 22 and two adapter electrodes 23 disposed on the top cover body 21. Referring to FIG14, one adapter electrode 23 is electrically connected to the tab 38 of the first pouch battery cell, and the other adapter electrode 23 is electrically connected to the tab 38 of the second pouch battery cell. The polarities of the tabs 38 corresponding to the two adapter electrodes 23 are opposite. The sampling electrode 22 is electrically connected to the tabs 38 of the first pouch battery cell and the second pouch battery cell that are not connected to the adapter electrode 23. Part of the sampling electrode 22 is exposed on the top cover body 21.

[0274] A single pouch battery cell includes an electrode assembly, which comprises stacked positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive lead connected to the end of the positive current collector, the positive lead serving as a positive electrode tab 31. The negative electrode sheet includes a negative current collector and a negative lead connected to the end of the negative current collector, the negative lead serving as a negative electrode tab 32. Alternatively, the positive lead is connected to a positive adapter, thereby the positive lead and the positive adapter together constitute the positive electrode tab 31; the negative lead is connected to a negative adapter, thereby the negative lead and the negative adapter together constitute the negative electrode tab 32.

[0275] In some embodiments, as shown in Figures 8 and 19, the sampling electrode 22 and the transfer electrode 23 can be made of conductive metal materials, such as copper, aluminum, steel, copper-aluminum alloy, etc.

[0276] Two adapter electrodes 23 are used to connect the tabs 38 of the first and second pouch battery cells, respectively. One adapter electrode 23 is used to connect the tab of one pouch battery cell, and the other adapter electrode 23 is used to connect the tab of another pouch battery cell with opposite polarities. The sampling electrode 22 is electrically connected to the tabs 38 of the first and second pouch battery cells that are not connected to the adapter electrode 23. That is, the sampling electrode 22 is used to connect the tab of one pouch battery cell, and the tab of another pouch battery cell with opposite polarities. This enables series connection between pouch battery cells in the same battery cell. Of course, according to the requirements of those skilled in the art, one adapter electrode 23 can be used to connect the tab of one pouch battery cell, and the other adapter electrode 23 can be used to connect the tab of another pouch battery cell with the same polarity, thereby enabling parallel connection between pouch battery cells in the same battery cell 4.

[0277] Optionally, the two adapter electrodes 23 can be used to connect the positive electrode tab 31 of the first soft-pack battery cell and the negative electrode tab 32 of the second soft-pack battery cell, respectively, and the sampling electrode 22 can be used to connect the negative electrode tab 32 of the first soft-pack battery cell and the positive electrode tab 31 of the second soft-pack battery cell; alternatively, the two adapter electrodes 23 can be used to connect the positive electrode tab 31 of the second soft-pack battery cell and the negative electrode tab 32 of the first soft-pack battery cell, respectively, and the sampling electrode 22 can be used to connect the negative electrode tab 32 of the second soft-pack battery cell and the positive electrode tab 31 of the first soft-pack battery cell.

[0278] In some embodiments, a portion of the sampling electrode 22 is exposed on the top cover body 21 for connecting to an external busbar to enable electrical connections between multiple battery cells 4, such as in series, parallel, or mixed connections. The sampling electrode 22 may sometimes be referred to as a switch plate or adapter plate.

[0279] This facilitates easy connection between the top cover assembly 20 and the two pouch battery cells, and also makes it convenient for the two pouch battery cells to be connected in series. Furthermore, by enabling the sampling electrode to function as both an adapter and a sampling output component, it helps reduce the number of parts, improves integration, and increases assembly efficiency.

[0280] In some embodiments, as shown in Figures 8, 11, 12, and 14 to 19, each adapter electrode 23 is configured to include a tab adapter portion 231 and an exposed portion 232 connected to the tab adapter portion 231. The tab adapter portion 231 includes an adapter surface extending along a second direction Y. The exposed portion 232 is exposed outside the housing 42. Each battery cell includes an electrode assembly and a sealing bag for encapsulating the electrode assembly. A tab 38 extends from the sealing bag along the second direction Y, and the connecting surface of the tab adapter portion 231 is connected to the surface of the tab 38. The sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0281] In some embodiments, the electrode assembly is provided with tabs 38, which can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0282] The tab 231 of the adapter electrode 23 is used to connect one of the positive tab 31 and the negative tab 32 of the pouch battery cell (first pouch battery cell or second pouch battery cell). The exposed portion 232 of the adapter electrode 23 is exposed to the outside of the housing 42 and is used to connect to an external busbar to achieve electrical connection between multiple pouch battery cells. The adapter electrode 23 may sometimes be referred to as a tab or adapter plate.

[0283] In some embodiments, as shown in FIG19, in the adapter electrode 23, the tab adapter portion 231 and the exposed portion 232 are bent and connected.

[0284] In some embodiments, as shown in Figures 14 and 19, in the same battery cell, the negative electrode tab 32 of one battery cell is connected to the tab adapter portion 231 of one adapter electrode 23, and the positive electrode tab 31 of another battery cell is connected to the tab adapter portion 231 of another adapter electrode 23; or, in the same battery cell, the positive electrode tab 31 of one battery cell is connected to the tab adapter portion 231 of one adapter electrode 23, and the negative electrode tab 32 of another battery cell is connected to the tab adapter portion 231 of another adapter electrode 23.

[0285] The term "surface connection" can refer to, for example, a portion where the connecting surface of the tab adapter 231 overlaps with the surface of the positive tab 31 in a direction perpendicular to the first direction X (e.g., the up-down direction shown in FIG. 14). This overlapping portion allows for a bend-free connection and reduces gaps. In some embodiments, the positive tab 31 and the negative tab 32 extend from the positive and negative electrode plates in the electrode assembly along the second direction Y, respectively, with the extended portions being bend-free. These bend-free positive and negative tabs 31 and 32 are then surface-connected to the connecting surfaces of the tab adapter 231 via welding.

[0286] Therefore, the tabs extending along the second direction Y can be connected to the transition surface extending along the second direction Y without bending, thereby reducing the risk of tab breakage and poor connection caused by tab bending, and improving the reliability of battery cells and battery devices.

[0287] In the adapter electrode 23, the tab adapter portion 231 and the exposed portion 232 are bent and connected.

[0288] In some embodiments, as shown in Figures 15, 17 to 19, the sampling electrode 22 is configured to include two tab connection portions 221 and a sampling exposure portion 222 connected to the tab connection portions 221. The sampling exposure portion 222 is exposed on the top cover body 21. The tab connection portion 221 includes a tab connection surface extending along the second direction Y. Each tab connection surface is connected to a tab surface that is not connected to the adapter electrode 23.

[0289] The tab connection portion 221 of the sampling electrode 22 and the tab connection portion 231 of the adapter electrode 23 are respectively used to connect one of the positive tab 31 and the negative tab 32 of the battery cell. The sampling exposure portion 222 of the sampling electrode 22 and the exposure portion 232 of the adapter electrode 23 are exposed to the outside of the housing 42 for connecting to an external busbar to realize electrical connection between multiple battery cells, such as series, parallel, or mixed connection. The sampling electrode 22 and the adapter electrode 23 are sometimes referred to as a tab or adapter plate.

[0290] In some embodiments, as shown in Figures 9 and 19, in the same battery cell, the tab connection portion 221 of the sampling electrode 22 is connected to the positive tab 31 of a pouch cell, the other tab connection portion 221 of the sampling electrode 22 is connected to the negative tab 32 of another pouch cell, the negative tab 32 of one pouch cell is connected to the tab connection portion 231 of a transfer electrode 23, and the positive tab 31 of another battery cell is connected to the tab connection portion 231 of another transfer electrode 23; or, in the same battery cell, the tab connection portion 221 of the sampling electrode 22 is connected to the negative tab 32 of one battery cell, the other tab connection portion 221 of the sampling electrode 22 is connected to the positive tab 31 of another battery cell, the positive tab 31 of one battery cell is connected to the tab connection portion 231 of a transfer electrode 23, and the negative tab 32 of another battery cell is connected to the tab connection portion 231 of another transfer electrode 23.

[0291] In some embodiments, as shown in Figures 8, 9 and 19, the number of adapter electrodes 23 is even. In the same battery cell, one tab connection portion 221 of the sampling electrode 22 is connected to the positive tab 31 or negative tab 32 of a battery cell, and the other tab connection portion 221 of the sampling electrode 22 is connected to the positive tab 31 or negative tab 32 of another battery cell. The tabs in each battery cell that are not connected to the sampling electrode 22 are respectively connected to the tab adapter portion 231 of the adapter electrode 23.

[0292] In the embodiment shown in FIG19, the connector having tab connection portion 221 and sampling exposure portion 222 is referred to as sampling electrode 22, and the connector having tab transition portion 231 and exposure portion 232 is referred to as transition electrode 23. That is, in the example shown in FIG19, one sampling electrode 22 and two transition electrodes 23 are shown. Of course, there may be two or more sampling electrodes 22 and more pairs of transition electrodes 23, such as four or six. Since the two tab connection portions 221 of the sampling electrode 22 are connected, one sampling electrode 22 can electrically connect two tabs.

[0293] In some embodiments, the tab adapter 231 and the exposed portion 232 are integrally formed; the tab connection 221 and the sampling exposed portion 222 are integrally formed. This facilitates connection with the positive tab 31 and the negative tab 32, resulting in a more reliable connection, improved battery reliability, and a reduction in the number of parts.

[0294] In some embodiments, as shown in FIG19, the two tab connection portions 221 of the sampling electrode 22 are connected by a bending portion 224. The bending portion 224 is bent relative to the tab connection portion 221. One end of one tab connection portion 221 in the second direction Y is connected to the sampling exposed portion 222, the other end of the tab connection portion 221 in the second direction Y is connected to one end of the bending portion 224, and the other end of the bending portion 224 is connected to one end of the other tab connection portion 221 in the second direction Y. The two tab connection portions 221 extend in parallel. This facilitates connection to the positive tab 31 and negative tab 32 of the pouch battery cell respectively, and the series connection of the pouch battery cells is more reliable, improving battery reliability.

[0295] In some embodiments, as shown in FIG19, the two tabs 221 of the sampling electrode 22 can be connected by a bending portion 224 to form a generally U-shaped integral structure, which facilitates integral molding with the top cover body 21, reduces processing steps, and improves connection reliability.

[0296] Optionally, the sampling exposure portion 222 can be formed in the third direction Z to be the same length as the tab connection portion 221, or it can be formed in the third direction Z to be shorter than the tab connection portion 221, as shown in FIG19.

[0297] When the sampling exposure portion 222 is shorter than the tab connection portion 221, the sampling exposure portion 222 may optionally be formed at one end of the tab connection portion 221 as shown in FIG19, or it may be formed in the middle portion between the two ends of the tab connection portion 221 (not shown in the figure).

[0298] Optionally, the sampling electrode 22 can be disposed on the top cover body 21 with the sampling exposed portion 222 located near one end of the top cover body 21 along the third direction Z, as shown in FIG19, or it can be disposed on the top cover body 21 with the sampling exposed portion 222 located at the middle part of the top cover body 21 along the third direction Z (not shown in the figure).

[0299] The sampling electrode 22 can be connected to two tabs, and the adapter electrodes 23 can each be connected to one tab. For example, there are two adapter electrodes 23. One tab connection 221 of the sampling electrode 22 and the tab connection 231 of the adapter electrode 23 are respectively connected to the positive tab 31 and negative tab 32 of the same battery cell. The other tab connection 221 of the sampling electrode 22 and the tab connection 231 of the other adapter electrode 23 are respectively connected to the negative tab 32 and positive tab 31 of another battery cell, thus forming a series-connected battery cell (hereinafter sometimes referred to as a "battery cell series"). In this case, the positive and negative terminals of the battery cell series can be led out from the exposed portions 232 of the two adapter electrodes 23, respectively.

[0300] In some embodiments, referring to FIG19, the sampling exposure portion 222 and the electrode connecting portion 221 are integrally formed. The integral structure facilitates integral molding with the top cover body 21, reduces processing steps, and improves connection reliability.

[0301] The tab connection 221 and the sampling exposure portion 222 can be bent together, with an included angle between them. In one example, the tab connection 221 and the sampling exposure portion 222 are perpendicular to each other. The tab connection 221 and the sampling exposure portion 222 can be located on opposite sides of the top cover body 21 in the second direction Y, for example, as shown in FIG. 19, with the tab connection 221 located below the top cover body 21 and the sampling exposure portion 222 located above the top cover body 21. Alternatively, depending on the specific circumstances, the tab connection 221 and the sampling exposure portion 222 may not be bent.

[0302] The tab adapter 231 and the exposed portion 232 can be bent together, with an included angle between them. In one example, the tab adapter 231 and the exposed portion 232 are perpendicular to each other. The tab adapter 231 and the exposed portion 232 can be located on opposite sides of the top cover body 21 in the second direction Y, for example, as shown in FIG. 19, with the tab adapter 231 located below the top cover body 21 and the exposed portion 232 located above the top cover body 21. Alternatively, depending on the specific circumstances, the tab adapter 231 and the exposed portion 232 may not be bent.

[0303] Here, the bent structure can be achieved, for example, through bending processing, or of course, through other suitable methods.

[0304] By bending the tab connection 221 to the sampling exposure 222 and bending the tab adapter 231 to the exposure 232, the space occupied by the sampling electrode 22 and the adapter electrode 23 in the battery cell is reduced, providing more space for battery pack assembly.

[0305] In some embodiments, both the sampling exposure portion 222 and the exposure portion 232 are parallel to the top surface of the top cover body 21.

[0306] The sampling exposure portion 222 and the exposure portion 232 can extend parallel to the first direction X, including the case where the sampling exposure portion 222 and / or the exposure portion 232 are substantially flush with the top surface of the top cover body 21, and also the case where a platform difference is formed relative to the top cover body 21.

[0307] As shown in FIG19, in some embodiments, a recess 213 may be formed on the top surface of the top cover body 21, so that the sampling exposed portion 222 and exposed portion 232 are partially or completely submerged in the recess 213.

[0308] Since both sampling exposure portions 222 and 232 are parallel to the top surface of the top cover body 21, it is convenient to connect them through the busbar component to realize the series, parallel, or mixed connection of multiple batteries. Moreover, it helps to reduce the space occupied by sampling exposure portions 222 and 232 and the busbar component above the top cover body 21 (on the side away from the outer casing along the second direction Y).

[0309] Therefore, the tabs extending along the second direction Y can be connected to the tab connecting surfaces extending along the second direction Y without bending, thereby reducing the risk of tab breakage and poor connection caused by tab bending, and improving the reliability of battery cells and battery devices.

[0310] In some embodiments, as shown in Figures 14 to 19, two adapter electrodes 23 are arranged side by side on the top cover body 21 along the first direction X, and / or two adapter electrodes 23 are arranged side by side on the top cover body 21 along the third direction Z. An insulating shield 25 is provided between the tab adapter portions 231 of two adjacent adapter electrodes 23. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0311] As shown in Figure 19, the sampling electrode 22 and the transfer electrode 23 are arranged side by side on the top cover body 21 along the third direction Z, and / or the sampling electrode 22 and the transfer electrode 23 are arranged side by side on the top cover body 21 along the first direction X.

[0312] In some embodiments, referring to FIG19, two adapter electrodes 23 are arranged side by side along a first direction X, and sampling electrode 22 and adapter electrode 23 are arranged side by side along a third direction Z. The first pouch battery cell and the second pouch battery cell can be arranged side by side along the first direction X. That is, the tab connection portion 221 of sampling electrode 22 and the tab connection portion 231 of adapter electrode 23, which is on the same side as tab connection portion 221 along the first direction X, are respectively connected to the positive and negative tabs of the same pouch battery cell (e.g., the first pouch battery cell or the second pouch battery cell); the other tab connection portion 221 of sampling electrode 22 and the tab connection portion 231 of adapter electrode 23, which is on the same side as the other tab connection portion 221 along the first direction X, are respectively connected to the negative and positive tabs of another pouch battery cell (e.g., the second pouch battery cell or the first pouch battery cell).

[0313] As shown in Figure 14, an insulating shield 25 is provided between adjacent two pole ear connection parts 221. The insulating shield 25 can be an independent component or a part of the top cover body 21.

[0314] The insulating shield 25 can block the positive electrode tab 31 and negative electrode tab 32 connected to the connection surfaces of two adjacent transfer electrodes 23, preventing short circuits and improving the reliability of the battery cell.

[0315] The risk of accidental short circuit between the two adapter electrodes can be reduced by installing insulating shields.

[0316] In some embodiments, as shown in FIG14, the insulating shield 25 protrudes from both ends of the adapter electrode 23 along the second direction Y.

[0317] For example, the insulating shield 25 protrudes along the second direction Y from one end of the adapter electrode 23 toward the pouch cell.

[0318] Electrical clearance refers to the shortest spatial distance measured between two conductive components or between a conductive component and the protective interface of an equipment.

[0319] Creepage distance is the shortest path between two conductive parts or between a conductive part and the protective interface of an equipment, measured along an insulating surface.

[0320] In this embodiment of the present disclosure, the insulating shield 25 protrudes from both ends of the transition electrode 23 along the second direction Y, so that the two transition electrodes 23 can be better separated at both ends of the second direction Y, which is beneficial to increasing the electrical clearance and creepage distance between the two transition electrodes 23 and improving the insulation performance.

[0321] For example, the insulating shield 25 may not protrude from the adapter electrode 23 along the second direction Y.

[0322] In some embodiments, as shown in FIG14, the battery cell 4 further includes an insulating support 26 connected to the insulating shield 25. The insulating shield 25 is provided with insulating supports 26 on both sides of the opposite side along the direction in which the two transfer electrodes 23 are arranged. The insulating support 26 is located on the side of the top cover body 21 facing the battery cell group along the second direction Y. One end of the transfer electrode 23 away from the exposed portion 232 abuts against the side of the insulating support 26 facing the top cover body 21.

[0323] The insulating support 26 is a structure that supports the transfer electrode 23 on the side facing the battery cell pack along the second direction Y.

[0324] For example, the insulating shield 25 is connected to an insulating base 26 on one side of the direction in which the two transition electrodes 23 are arranged, and the insulating shield 25 is connected to an insulating base 26 on the other side of the direction in which the two transition electrodes 23 are arranged.

[0325] For example, the insulating base 26 is located inside the housing 42.

[0326] In this embodiment, the insulating supports 26 on both sides of the insulating shield 25 support one end of the tab transition portion 231 of the two transition electrodes 23 that is away from the exposed portion 232. This increases the distance from the end of the tab transition portion 231 of one of the two transition electrodes 23 that is away from the exposed portion 232 along the surface of the insulating shield 25 through the insulating supports 26 to the tab transition portion 231 of the other transition electrode 23. This increases the creepage distance between the corresponding tab transition portions 231 of the two transition electrodes 23 and improves the insulation performance.

[0327] It is understandable that battery cell 4 may not have an insulating support 26.

[0328] In some embodiments, as shown in FIG14, in the tab transition portions 231 of two adjacent transition electrodes 23, the side of each transition electrode 23's tab transition portion 231 facing away from the corresponding other tab transition portion 231 protrudes from the insulating support 26.

[0329] For example, as shown in FIG14, the tabs 231 of the two adapter electrodes 23 protrude from the insulating base on opposite sides.

[0330] In this embodiment of the present disclosure, the tab transition portion 231 of each transition electrode 23 protrudes from the insulating base 26 on the side opposite to the corresponding tab transition portion 231, so that the positive tab 31 or negative tab 32 connected to the tab transition portion 231 will hardly contact the insulating base 26 and remain in a straight state, reducing the possibility of the tab bending due to interference between the insulating base 26 and the positive tab 31 or negative tab 32.

[0331] In some embodiments, along the arrangement direction of two adjacent transition electrodes 23, the insulating base may protrude from the electrode transition portion 231.

[0332] In some embodiments, as shown in FIG14, the insulating shield 25 includes: an insulating body 251 connected to the side of the insulating base 26 facing the top cover body 21, the insulating body 251 being sandwiched between the tabs 231 of two adjacent transition electrodes 23; and an insulating auxiliary member 252 connected to the side of the insulating base 26 away from the top cover body 21, the thickness of the insulating auxiliary member 252 along the arrangement direction of the two adjacent transition electrodes 23 being less than the thickness of the insulating body 251 along the arrangement direction of the two adjacent transition electrodes 23, and the dimension of the insulating auxiliary member 252 along the second direction Y being greater than the thickness of the insulating auxiliary member 252 along the arrangement direction of the two adjacent transition electrodes.

[0333] The insulating body 251 is sandwiched between the tabs 231 of two adjacent transition electrodes 23, which serves to separate the two transition electrodes 23. The insulating body 251 is mainly able to provide a suitable electrical clearance for the two adjacent transition electrodes 23.

[0334] The insulating accessory 252 is located on the side of the insulating base 26 away from the top cover body 21. Two adjacent transition electrodes 23 are connected to the positive electrode tab 31 or negative electrode tab 32 of the pouch battery cell, so that the insulating accessory 252 is located between the positive electrode tab 31 and the negative electrode tab 32 of two adjacent pouch battery cells. The insulating accessory 252 can effectively separate the positive electrode tab 31 and / or the negative electrode tab 32 on the side away from the top cover body 21.

[0335] For example, as shown in FIG14, the thickness of the insulating body 251 along the arrangement direction of two adjacent transition electrodes 23 is D5, and the thickness of the insulating auxiliary component 252 along the arrangement direction of two adjacent transition electrodes 23 is D6. <D5。

[0336] For example, as shown in FIG14, the dimension of the insulating accessory 252 along the second direction Y is D7, where D7>D6.

[0337] In this embodiment, since the dimension of the insulating auxiliary component 252 along the second direction Y is greater than the thickness of the insulating auxiliary component 252 along the arrangement direction of the two adjacent transition electrodes 23, the creepage distance between the tab transition portions 231 of the two adjacent transition electrodes 23 is mainly provided by the dimension of the insulating auxiliary component 252 along the second direction Y, which is beneficial to increase the creepage distance and improve insulation reliability. Since the dimension of the insulating auxiliary component 252 along the second direction Y is greater than the thickness of the insulating auxiliary component 252 along the arrangement direction of the two adjacent transition electrodes 23, the area of ​​the cross section of the insulating auxiliary component 252 perpendicular to the arrangement direction of the two adjacent transition electrodes 23 is larger, reducing the thickness of the insulating auxiliary component 252 along the arrangement direction of the two adjacent transition electrodes 23 is beneficial to reduce the mass of the insulating auxiliary component 252 and improve the mass energy density.

[0338] In some embodiments, as shown in FIG14, the thickness of the insulating accessory 252 along the arrangement direction of two adjacent transition electrodes 23 may be greater than or equal to the thickness of the insulating body 251 along the arrangement direction of two adjacent transition electrodes 23.

[0339] In some embodiments, as shown in FIG14, the insulating shield 25 further includes an insulating separator 253. The insulating separator 253 is connected to the side of the insulating body 251 away from the insulating support 26. The insulating separator 253 protrudes from the exposed portion 232 away from the side of the electrode tab adapter portion 231 along the second direction Y. The thickness of the insulating separator 253 along the arrangement direction of two adjacent adapter electrodes 23 is less than the thickness of the insulating body 251 along the arrangement direction of two adjacent adapter electrodes 23. The dimension of the insulating separator 253 along the second direction Y is greater than the thickness of the insulating separator 253 along the arrangement direction of two adjacent adapter electrodes 23.

[0340] The insulating separator 253 mainly serves to separate and insulate the exposed portion 232.

[0341] The creepage distance between the exposed portions 232 of two adjacent transfer electrodes 23 is increased by the protrusion of the insulating separator 253 out of the exposed portion 232.

[0342] For example, as shown in FIG14, the thickness of the insulating separator 253 along the arrangement direction of two adjacent transition electrodes 23 is D8, D8 <D5。

[0343] For example, as shown in FIG14, the insulating separator 253 has a dimension of D9 along the second direction Y, where D9 > D8.

[0344] In this embodiment, since the dimension of the insulating separator 253 along the second direction Y is greater than the thickness of the insulating separator 253 along the arrangement direction of the two adjacent transition electrodes 23, the creepage distance between the exposed portions 232 of the two adjacent transition electrodes 23 is mainly provided by the dimension of the insulating separator 253 along the second direction Y, which is beneficial to increasing the creepage distance and improving insulation reliability. Since the dimension of the insulating separator 253 along the second direction Y is greater than the thickness of the insulating separator 253 along the arrangement direction of the two adjacent transition electrodes 23, the area of ​​the cross-section of the insulating separator 253 perpendicular to the arrangement direction of the two adjacent transition electrodes 23 is larger. Reducing the thickness of the insulating separator 253 along the arrangement direction of the two adjacent transition electrodes 23 is beneficial to minimizing the mass of the insulating separator 253 and improving the mass energy density of the battery.

[0345] In some embodiments, the thickness of the insulating separator 253 along the arrangement direction of two adjacent transition electrodes 23 may be greater than or equal to the thickness of the insulating body 251 along the arrangement direction of two adjacent transition electrodes 23.

[0346] In some embodiments, the sampling electrode 22 and the transfer electrode 23 are respectively injection molded with the top cover body 21.

[0347] In some embodiments, the sampling electrode 22 and the adapter electrode 23 are injection molded onto the top cover body 21. Thus, the sampling electrode 22 and the adapter electrode 23 are integrally formed with the top cover body 21, resulting in a more stable connection and improved battery reliability.

[0348] In some embodiments, as shown in FIG8, the pressure relief cover is an insulating film with a melting point greater than or equal to 100°C and less than or equal to 500°C.

[0349] In some embodiments, the melting point of the insulating film may be greater than or equal to 150°C and less than or equal to 500°C; further, the melting point of the insulating film may be greater than or equal to 200°C and less than or equal to 500°C.

[0350] For example, the melting point of the insulating film may be 100°C, 200°C, 300°C, 400°C or 500°C.

[0351] The pressure relief cover 40 is an insulating film, which helps to insulate the battery cells inside the casing 42 from the components outside the casing. The melting point of the insulating film is greater than or equal to 100°C and less than or equal to 500°C. The insulating film with a suitable melting point can both block the pressure relief port under normal cyclic operation of the battery cells (without thermal runaway) and be quickly melted and ruptured to relieve pressure in the event of thermal runaway of the battery cells inside the casing 42.

[0352] In some embodiments, as shown in Figures 8 and 10, the pressure relief cover is a metal cover with a weakened area for pressure relief.

[0353] For example, the pressure relief cover 40 may be made of the same material as the outer casing.

[0354] The weakened zone 41 refers to the area on the pressure relief cover 40 with a relatively low pressure-bearing capacity.

[0355] For example, the weakened area 41 can be a groove provided on the pressure relief cover 40.

[0356] By providing a weakened area 41 on the pressure relief cover 40, the metal cover can effectively block the pressure relief port 424 in the absence of thermal runaway, and can achieve pressure relief through the fracture of the weakened area in the event of thermal runaway.

[0357] In some embodiments, as shown in Figures 8 and 10, the wall thickness of the weakened area is less than the wall thickness of the rest of the pressure relief cover.

[0358] By setting a region with a smaller wall thickness on the pressure relief cover 40, the strength of the pressure relief cover 40 in the region with a smaller wall thickness is lower, and the pressure bearing capacity of the pressure relief cover 40 in the region with a smaller wall thickness is lower than that of other regions. In this way, in the event of thermal runaway of the battery cell, the gas and high-temperature emissions generated by thermal runaway can more easily break through the weakened region 41, thereby relieving the pressure in the containment space.

[0359] In some embodiments, as shown in FIG14, the top cover assembly includes a top cover body 21 having a mounting groove 214 with an opening on one side of the top cover body 21 facing the housing 42 in the second direction Y, and the opening edge of the housing 42 is inserted into the mounting groove 214.

[0360] Mounting groove 214 is a recessed structure that accommodates the opening edge of housing 42.

[0361] The opening edge of the outer casing 42 is inserted into the mounting groove 214, and the opening edge of the outer casing 42 is located between the inner wall of the mounting groove 214 and the outer wall of the mounting groove 214.

[0362] For example, the mounting slot 214 is a recess.

[0363] In this embodiment, the opening edge of the outer shell 42 is inserted into the mounting groove 214. The groove wall of the mounting groove 214 constrains the opening edge of the outer shell 42, which helps to reduce the shaking of the top cover body 21 relative to the outer shell 42.

[0364] In some embodiments, the top cover body 21 is glued to the outer casing 42.

[0365] For example, adhesive can be applied between the top cover body 21 and the outer casing 42 to achieve bonding.

[0366] For example, the top cover body 21 can be glued to the outer casing 42 with tape.

[0367] For example, the tape used to bond the top cover body 21 to the outer shell 42 can be a ceramic composite tape.

[0368] In this embodiment of the present disclosure, the top cover body 21 is glued to the outer shell 42, so that the top cover body 21 can be installed on the outer shell 42 relatively easily.

[0369] In some embodiments, the top cover body 21 and the outer casing 42 can also be connected by a connector. For example, the top cover body 21 and the outer casing 42 are connected by rivets.

[0370] In some embodiments, as shown in FIG14, the mounting groove 214 has a guide rib 901 located inside the housing 42. The guide rib 901 has a guide surface 9011 on the side facing the side wall of the housing 42, pointing from the opening of the mounting groove 214 to the bottom of the mounting groove 214. The guide surface 9011 is inclined towards the side wall of the housing 42.

[0371] The guide rib 901 is a structure that guides the opening edge of the housing 42 to move to a predetermined position in the mounting groove.

[0372] For example, the guide rib 901 can be in the shape of a plate structure.

[0373] For example, the number of guide ribs 901 can be at least two, and at least two guide ribs 901 are arranged at circumferential intervals along the top cover body 21.

[0374] In this embodiment, during the installation of the top cover body 21 onto the outer casing 42, the guide surface 9011 of the guide rib 901 guides the edge of the opening of the outer casing 42 to move, so that the edge of the opening of the outer casing 42 approaches the outer side wall of the mounting groove, thereby guiding the opening of the outer casing 42 to a predetermined position within the mounting groove. The guide rib 901 and the outer side wall of the mounting groove further constrain the edge of the opening of the outer casing 42 into a narrow gap. In addition, since the guide surface of the guide rib is gradually inclined, the opening of the mounting groove is not significantly reduced, allowing the outer casing to be easily inserted into the mounting groove.

[0375] In some embodiments, the mounting groove 214 may not have guide ribs 901.

[0376] In some embodiments, as shown in Figures 2, 3 and 19, at least one busbar connects the battery cells in series and / or in parallel by means of an electrical connection to the sampling electrode 22 and the transfer electrode 23.

[0377] Because the battery cell provided in this embodiment has a pressure relief port 424, it enables directional ejection of the battery cell in the event of thermal runaway, reducing the possibility of high-temperature emissions spreading and damaging other battery cells and components in the battery device, thus improving the reliability of the battery cell and the battery device. Furthermore, the battery cell does not require bending the tabs to connect the tabs to the connectors, reducing the risk of tab breakage, and therefore further enhancing the reliability of the battery device.

[0378] Additionally, although not shown in the figures, the battery device may further include a housing for accommodating one or more battery cells. In some embodiments, the housing also includes a cover to form an enclosed space for accommodating the battery cells. In the battery device...

[0379] This enables the battery cells to be connected in series and / or in parallel.

[0380] In some embodiments, as shown in Figures 2 to 8, there are multiple battery cells 4, the openings 423 of the housings 42 of each battery cell 4 are located on the same side along the second direction Y, and the pressure relief ports 424 of the housings 42 of each battery cell are located on opposite sides of the openings 423 along the second direction Y; the top cover assemblies 20 of adjacent battery cells 4 are connected to each other, and each top cover assembly 20 closes the openings 423 of its corresponding housings 42, and the second direction Y is perpendicular to the first direction X.

[0381] Since the openings 423 of the outer casings 42 of each battery cell are all located on the same side along the second direction Y, it is more convenient for the busbar 8 to connect to the electrical connectors of the top cover assembly 20 of adjacent battery cells, thereby making it easier to connect the batteries. Moreover, the extension length of the busbar 8 does not need to be too long, which helps to save materials and reduce production costs.

[0382] The pressure relief port 424 is located on the opposite side of the opening 423 along the second direction Y, so that in the event of thermal runaway of the battery cell, the high-temperature emissions can be discharged directionally from the bottom direction opposite to the direction of the opening 423, thereby making it less likely to affect the top cover assembly 20 covering the opening 423 and improving the reliability of the battery cell.

[0383] A second aspect of this disclosure provides an electrical device including a battery device for providing electrical energy.

[0384] This helps reduce the risk of large-scale thermal runaway in electrical devices.

[0385] A third aspect of this disclosure provides an energy storage device, including a battery device capable of storing electrical energy and providing electrical energy.

[0386] Figure 20 is a schematic diagram of the structure of an energy storage device 2000 provided in some embodiments of this disclosure. The energy storage device 2000 includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0387] This helps reduce the risk of large-scale thermal runaway in energy storage devices.

[0388] A fourth aspect of this disclosure provides a battery cell, as shown in FIG8, the battery cell 4 including: a housing 42; a battery cell group 30 located inside the housing 42, the battery cell group 30 including at least two battery cells arranged along a first direction X; and at least one heat insulation member located between the housing 42 and the battery cell group 30.

[0389] This helps reduce the risk that a battery cell with a high temperature (e.g., thermal runaway) will transfer heat through the casing 42 to the surrounding structure (e.g., other battery cells or other components), thereby reducing the risk of thermal runaway caused by the battery cell.

[0390] In some embodiments, as shown in FIG8, at least one heat insulation element 15 includes at least two first heat insulation elements 151; the outer casing 42 includes a first casing wall 421 and a second casing wall 422 perpendicular to the first direction X; at least two battery cells include a first battery cell 331 and a second battery cell 341, with at least one first heat insulation element 151 provided between the first battery cell 331 and the first casing wall 421 adjacent to the first battery cell 331 along the first direction X, and at least one first heat insulation element 151 provided between the second battery cell 341 and the second casing wall 422 adjacent to the second battery cell 341 along the first direction X.

[0391] This helps to more effectively block heat transfer from the inside of the battery cell that has experienced thermal runaway to the casing, further reducing the risk that the high-temperature battery cell will transfer heat to the surrounding structure through the casing, thereby further reducing the risk of thermal runaway caused by the battery cell.

[0392] In some embodiments, as shown in FIG8, the battery cell further includes at least one buffer 7, which is connected between adjacent battery cells along the first direction X.

[0393] This helps to absorb assembly errors between battery cells, provides buffer space for battery cell expansion, and can also suppress excessive expansion of battery cells, which helps to extend the service life of battery cells.

[0394] As shown in Figures 2 to 19, the individual cells of the soft-pack battery form a small unit (battery unit 4), and the units together form a module (battery module). This structure has the problem of multiple heat transfer paths and difficulty in preventing thermal runaway.

[0395] In this disclosure, a first heat insulation member 151 is provided inside the battery cell 4 to prevent the heat from the battery cell that has thermally runaway from being transferred to the housing wall of the outer casing 42 and then to the housing wall of the adjacent battery cell 4, thereby transferring heat to the battery cell in the adjacent battery cell 4. A second heat insulation member 152 is provided between the battery cells to absorb the grouping tolerance between the battery cells 4 on the one hand, and to prevent the heat transfer between the battery cells 4 on the other hand.

[0396] Battery cells are bonded together with adjacent battery cells via buffer 7 to form a battery cell group. A first heat insulation component 151 is bonded to the outside of the battery cell group. The first heat insulation component 151 can block the heat transferred from the battery cells to the outer casing 42 and can also absorb the group tolerance. The positive and negative electrode tabs of the battery cells are welded to the connector of the top cover assembly 20 and then assembled into the outer casing 42. The top cover assembly 20 is provided with a mounting groove and is assembled with one end of the outer casing 42. It can be further reinforced and sealed by applying glue. The pressure relief cover 40 covers the pressure relief port 424 at the other end of the outer casing 42. The pressure relief cover 40 can be an insulating film that is not resistant to high temperature or a metal bottom cover (which is welded to the outer casing 42 to form a seal). If it is a metal bottom cover, a weakening area 41 needs to be provided on the metal bottom cover. The weakening area 41 can be formed by locally thinning the wall thickness of the pressure relief cover 40. The shape of the weakening area 41 is not specifically limited in this application.

[0397] When battery cell 4 experiences thermal runaway, it generates high-temperature and high-pressure gas that fills the casing 42. The pressure relief cover 40 is dissolved or blown open, releasing the ejected material from the runaway battery cell in a directional manner.

[0398] The above embodiments are merely illustrative of the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure, and all should be covered within the scope of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, wherein, include: A plurality of battery cells arranged along a first direction, each battery cell including a housing and a group of battery cells located within the housing, the group of battery cells including at least two battery cells arranged along the first direction, the plurality of battery cells including a first battery cell and a second battery cell adjacent to each other along the first direction, the battery cells of the first battery cell including a first battery cell that is closest to the second battery cell along the first direction, and the battery cells of the second battery cell including a second battery cell that is closest to the first battery cell along the first direction. At least one heat insulation element is located between the first battery cell and the second battery cell.

2. The battery device according to claim 1, wherein, The at least one thermal insulation element includes at least one first thermal insulation element. The first heat insulation element is located inside the casing of the first battery cell, or... The first heat insulation element is located inside the casing of the second battery cell, or, There are multiple first heat insulation components, and the first heat insulation components are provided inside the outer shell of the first battery unit and the outer shell of the second battery unit.

3. The battery device according to claim 2, wherein, The first battery cell has a first housing wall located between the first battery cell and the second battery cell. The second battery cell has a second housing wall located between the first battery cell and the second battery cell. The first heat insulation element is connected between the first battery cell and the first housing wall, and / or the first heat insulation element is connected between the second battery cell and the second housing wall.

4. The battery device according to claim 2 or 3, wherein, Each of the battery cells includes a main body, a sealing edge, and a transition portion connecting the main body and the sealing edge. In the same projection plane perpendicular to the first direction, the projection of the first heat insulation member along the first direction at least partially overlaps with the projection of the main body of the battery cell along the first direction, and the projected area of ​​the main body accounts for 70% to 100% of the projected area of ​​the first heat insulation member.

5. The battery device according to claim 2 or 3, wherein, Each of the battery cells includes a main body, a sealing edge, and a transition portion connecting the main body and the sealing edge. The first heat insulation component includes a first heat insulation layer and a first encapsulation component covering the first heat insulation layer. In the same projection plane perpendicular to the first direction, the projection of the first heat insulation layer along the first direction at least partially overlaps with the projection of the main body of the battery cell along the first direction, and the projected area of ​​the main body accounts for 70% to 100% of the projected area of ​​the first heat insulation layer.

6. The battery device according to any one of claims 2 to 5, wherein, Along the first direction, the thickness of the first thermal insulation element is in the range of 1 mm to 10 mm.

7. The battery device according to any one of claims 2 to 6, wherein, The battery device further includes a first end limiting member and a second end limiting member disposed opposite to each other along a first direction. A plurality of battery cells are arranged between the first end restrictor and the second end restrictor along the first direction. The first heat insulation member is also provided between the first end restrictor and the battery cell adjacent to the first end restrictor along the first direction, and / or between the second end restrictor and the battery cell adjacent to the second end restrictor along the first direction.

8. The battery device according to any one of claims 1 to 7, wherein, The at least one heat insulation element includes a second heat insulation element. Along the first direction, the second heat insulation element is connected between the first battery cell and the second battery cell.

9. The battery device according to claim 8, wherein, In the same projection plane perpendicular to the first direction, the projection of the second heat insulation member along the first direction at least partially overlaps with the projection of the outer casing of the battery cell along the first direction, and the projected area of ​​the outer casing accounts for 70% to 100% of the projected area of ​​the second heat insulation member.

10. The battery device according to claim 8, wherein, The second heat insulation component includes a second heat insulation layer and a second encapsulation component covering the heat insulation layer. In the same projection plane perpendicular to the first direction, the projection of the second heat insulation layer along the first direction at least partially overlaps with the projection of the outer casing of the battery cell along the first direction, and the projected area of ​​the outer casing accounts for 70% to 100% of the projected area of ​​the second heat insulation layer.

11. The battery device according to any one of claims 8 to 10, wherein, Along the first direction, the thickness of the second heat insulation element is in the range of 1 mm to 10 mm.

12. The battery device according to any one of claims 8 to 10, wherein, The battery device further includes a first end limiting member and a second end limiting member disposed opposite to each other along a first direction. A plurality of battery cells are arranged between the first end restrictor and the second end restrictor along the first direction. The second heat insulation member is also provided between the first end restrictor and the battery cell adjacent to the first end restrictor along the first direction, and / or between the second end restrictor and the battery cell adjacent to the second end restrictor along the first direction.

13. The battery device according to claim 7, wherein, The at least one heat insulation element includes a second heat insulation element. Along the first direction, the second heat insulation member is connected between the first battery cell and the second battery cell, between the first end restrictor and the battery cell adjacent to the first end restrictor along the first direction, and between the second end restrictor and the battery cell adjacent to the second end restrictor along the first direction.

14. The battery device according to claim 7, 12 or 13, wherein, The battery device also includes a housing. The enclosure has a first enclosure wall and a second enclosure wall that are arranged opposite to each other along a first direction. The first end restraint includes the first housing wall, and the second end restraint includes the second housing wall; or, The battery device further includes a first end plate and a second end plate disposed opposite to each other along a first direction. The first end limiting member includes the first end plate, and the second end limiting member includes the second end plate.

15. The battery device according to any one of claims 1 to 14, wherein, The thermal insulation material of the thermal insulation component includes at least one of aerogel, ceramic thermal insulation material, and foam material; And / or, the thermal conductivity of the insulation material is in the range of 0.03 W / (m·K) to 0.10 W / (m·K).

16. The battery device according to claim 15, wherein, The heat insulation component includes a first heat insulation component located within the housing of the battery cell. The heat insulation component includes a second heat insulation component located outside the outer casing of the battery cell and in contact with the outer casing surface. The first heat insulation component and the second heat insulation component are made of the same heat insulation material and / or have the same thickness.

17. The battery device according to any one of claims 1 to 16, wherein, Each of the battery cells also includes a buffer element. In the same battery cell, the buffer is located between adjacent battery cells along the first direction.

18. The battery device according to claim 17, wherein, Each of the battery cells includes a main body, a sealing edge, and a transition portion connecting the main body and the sealing edge. In the same projection plane perpendicular to the first direction, the projection of the buffer along the first direction and the projection of the adjacent main body along the first direction at least partially overlap, and the projection area of ​​the main body accounts for 70% to 100% of the projection area of ​​the buffer.

19. The battery device according to claim 18, wherein, In the same battery cell, Along the first direction, the ratio of the thickness of the buffer to the thickness of the main body of a single battery cell along the first direction is in the range of 1% to 10%.

20. The battery device according to any one of claims 17 to 19, wherein, The cushioning element includes at least one of foam and silicone rubber.

21. The battery device according to any one of claims 1 to 11, wherein, The battery cell is a pouch cell.

22. The battery device according to claim 21, wherein, The outer casing has openings and pressure relief ports located on different sides; The battery cell further includes a top cover assembly disposed on the housing and closing the opening, and a pressure relief cover disposed on the housing and closing the pressure relief port, wherein the pressure relief cover is configured to open the pressure relief port in the event of thermal runaway of the battery cell.

23. The battery device according to claim 22, wherein, The top cover assembly is located on one side of the battery cell, and the pressure relief port is located on the opposite side of the top cover assembly.

24. The battery device according to claim 22 or 23, wherein, Each of the battery cell groups includes a first pouch cell and a second pouch cell. The top cover assembly includes a top cover body, a sampling electrode disposed on the top cover body, and two adapter electrodes. One adapter electrode is electrically connected to the tab of the first pouch cell, and the other adapter electrode is electrically connected to the tab of the second pouch cell. The polarities of the tabs of the two adapter electrodes are opposite. The sampling electrode is electrically connected to the tabs of the first and second pouch battery cells that are not connected to the adapter electrode, and a portion of the sampling electrode is exposed on the top cover body.

25. The battery device according to claim 24, wherein, Each of the aforementioned adapter electrodes is configured to include an electrode adapter portion and an exposed portion connected to the electrode adapter portion. The electrode adapter includes an adapter surface extending along a second direction, and the exposed portion protrudes from the exterior of the housing. Each of the battery cells includes an electrode assembly and a sealed bag for encapsulating the electrode assembly. The tab extends from the sealed bag along a second direction, and the connecting surface of the tab adapter is connected to the tab surface.

26. The battery device according to claim 25, wherein, The sampling electrode is configured to include two tab connection portions and a sampling exposure portion connected to the tab connection portions, the sampling exposure portion being exposed outside the top cover body. The electrode connection portion includes an electrode connection surface extending along the second direction, and each electrode connection surface is connected to an electrode surface that is not connected to the adapter electrode.

27. The battery device according to claim 25 or 26, wherein, The two aforementioned adapter electrodes are arranged side-by-side on the top cover body along a first direction, and / or the two aforementioned adapter electrodes are arranged side-by-side on the top cover body along a third direction. An insulating shield is provided between the tabs of two adjacent adapter electrodes, and the first direction, the second direction and the third direction are perpendicular to each other.

28. The battery device according to claim 27, wherein, The insulating shielding member protrudes from both ends of the adapter electrode along the second direction.

29. The battery device according to claim 27 or 28, wherein, The top cover assembly also includes an insulating support connected to the insulating shield. The insulating shield is provided with the insulating support on both sides of the direction in which the two transition electrodes are arranged. The insulating support is located on the side of the top cover body facing the battery cell group in the second direction. The end of the transition electrode away from the exposed portion abuts against the side of the insulating support facing the top cover body.

30. The battery device according to claim 29, wherein, In the tab connection portion of two adjacent adapter electrodes, the tab connection portion of each adapter electrode protrudes from the insulating support on the side opposite to the corresponding other adapter electrode.

31. The battery device according to claim 29 or 30, wherein, The insulating shielding component includes: An insulating body is connected to the side of the insulating platform facing the top cover body, and the insulating body is clamped between the tabs of two adjacent adapter electrodes; An insulating accessory is connected to the side of the insulating platform away from the top cover body. The thickness of the insulating accessory along the arrangement direction of two adjacent transition electrodes is less than the thickness of the insulating body along the arrangement direction of two adjacent transition electrodes. The dimension of the insulating accessory along the second direction is greater than the thickness of the insulating accessory along the arrangement direction of two adjacent transition electrodes.

32. The battery device according to claim 31, wherein, The insulating shield also includes an insulating separator, which is connected to the side of the insulating body away from the insulating support. The insulating separator protrudes from the exposed portion away from the electrode tab adapter along the second direction. The thickness of the insulating separator along the arrangement direction of two adjacent adapter electrodes is less than the thickness of the insulating body along the arrangement direction of two adjacent adapter electrodes. The dimension of the insulating separator along the second direction is greater than the thickness of the insulating separator along the arrangement direction of two adjacent adapter electrodes.

33. The battery device according to any one of claims 24 to 32, wherein, The sampling electrode and the transfer electrode are respectively injection molded with the top cover body.

34. The battery device according to any one of claims 22 to 33, wherein, The pressure relief cover is an insulating film with a melting point greater than or equal to 100°C and less than or equal to 500°C.

35. The battery device according to any one of claims 22 to 34, wherein, The pressure relief cover is a metal cover with a weakened area for pressure relief.

36. The battery device according to claim 35, wherein, The wall thickness of the weakened zone is less than the wall thickness of the rest of the pressure relief cover.

37. The battery device according to claim 22, wherein, The top cover assembly includes a top cover body. The top cover body has a mounting groove with an opening on one side facing the outer casing in a second direction, and the opening edge of the outer casing is inserted into the mounting groove.

38. The battery device according to claim 37, wherein, The mounting groove has guide ribs located inside the housing. The guide ribs have a guide surface on the side facing the side wall of the housing, pointing from the opening of the mounting groove to the bottom of the mounting groove. The guide surface is inclined towards the side wall of the housing.

39. An electrical appliance, wherein, Includes the battery device according to any one of claims 1 to 38 for providing electrical energy.

40. An energy storage device, wherein, The battery device includes any one of claims 1 to 38, the battery device being capable of storing electrical energy and providing electrical energy.

41. A battery cell, wherein, include: shell; A battery cell assembly, located within the housing, the battery cell assembly comprising at least two battery cells arranged along a first direction; At least one heat insulation element is located between the housing and the battery cell assembly.

42. The battery cell according to claim 41, wherein, The at least one thermal insulation element includes at least two first thermal insulation elements; The outer casing includes a first casing wall and a second casing wall perpendicular to the first direction; At least one first heat insulation element is provided between the first housing wall and the battery cell adjacent to the first housing wall, and at least one first heat insulation element is provided between the second housing wall and the battery cell adjacent to the second housing wall.

43. The battery cell according to claim 41 or 42, wherein, The battery cell further includes at least one buffer element located between adjacent battery cells along the first direction.

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