Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a box body, a plurality of battery monomers and a bonding layer, the plurality of single batteries are accommodated in the box body, and the plurality of single batteries comprise at least one first single battery; the bonding layer is connected with the box body and the first battery monomer; the interlayer bonding strength of the bonding layer is smaller than the bonding strength of the bonding layer and the first battery monomer, the bonding layer can be broken from the interlayer of the bonding layer before the bonding relationship between the bonding layer and the first battery monomer fails, and a part of the bonding layer can be still bonded to the first battery monomer, so that the reliability of the battery monomer is improved, and the service life of the battery monomer is prolonged. And the reliability of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device and a power consumption device. BACKGROUND

[0002] Batteries are widely used in new energy vehicles, electronic devices and other fields. As the demand for batteries is increasing, higher requirements are put forward for the reliability of batteries. CONTENT OF THE INVENTION

[0003] Embodiments of the present application provide a battery device and a power consumption device, which can improve the reliability of the battery device.

[0004] In a first aspect, embodiments of the present application provide a battery device, comprising a box body, a plurality of battery monomers and an adhesive layer; the plurality of battery monomers are accommodated in the box body, and the plurality of battery monomers comprise at least one first battery monomer; the adhesive layer connects the box body and the first battery monomer; wherein the interlayer adhesive strength of the adhesive layer is less than the adhesive strength of the adhesive layer and the first battery monomer.

[0005] In the technical solution, the first battery monomer is connected to the box through the adhesive layer, the stability of the first battery monomer in the box is improved, and the reliability of the battery device is improved. The interlayer adhesive strength of the adhesive layer is less than the adhesive strength of the adhesive layer and the first battery monomer. When the battery device is subjected to impact or is in a vibration working condition, the adhesive layer can be broken from the interlayer of the adhesive layer before the adhesive relationship between the adhesive layer and the first battery monomer fails. Then, the adhesive layer can still be partially adhered to the first battery monomer. In the case where there is no insulating layer in the area of the battery monomer connected to the adhesive layer, the part of the adhesive layer adhered to the outer shell of the battery monomer can protect the battery monomer, such as insulating protection, reducing the risk of short circuit, overcharge, overdischarge, and other problems between the battery monomer and other components. For example, the outer shell of the battery monomer is in contact with the external environment, reducing the risk of pollution and corrosion, improving the reliability of the battery monomer, and improving the reliability of the battery device. In the case where the surface of the battery monomer connected to the adhesive layer is an insulating layer, the part of the adhesive layer adhered to the surface of the insulating layer and the insulating layer can jointly protect the battery monomer. In the case where the connection area of the battery monomer and the adhesive layer has two layers of insulating protection, the reliability of the battery monomer is improved. When the battery device is subjected to impact or is in a vibration working condition, the adhesive layer can be broken through the interlayer to separate the first battery monomer from the box. The connection relationship between the adhesive layer and the insulating layer is not easy to fail, and the insulating protection of the battery monomer in the area corresponding to the adhesive layer does not suddenly weaken, so that the battery monomer still has good reliability. The connection relationship between the insulating layer and the outer shell of the battery monomer is also not easy to fail due to the pulling of the adhesive layer, so that the insulating layer can always protect the battery monomer, and the battery monomer has high reliability, so that the battery device has good reliability.

[0006] In some embodiments of the first aspect of the application, the battery monomer includes an outer shell, an electrode assembly, and a first insulating layer. The electrode assembly is contained in the outer shell, and the first insulating layer is connected to the outer shell and covers at least part of the outer surface of the outer shell. The adhesive layer connects the first insulating layer of the first battery monomer and the box. The interlayer adhesive strength of the adhesive layer is less than the adhesive strength of the adhesive layer and the first insulating layer of the first battery monomer.

[0007] In the technical solution, the first insulation layer is arranged on the outer surface of the battery monomer, which can reduce moisture of the battery monomer, reduce corrosion of moisture on the battery monomer, reduce the risk of contact between the battery monomer and the external environment, prolong the service life of the battery monomer, reduce the entry of pollutants such as dust and moisture into the battery monomer, reduce the risk of damage or short circuit of the battery monomer caused by external impact, improve the reliability of the battery monomer, and improve the reliability of the battery device. The adhesive layer connects the first insulation layer of the first battery monomer and the box body, facilitating the connection of the first battery monomer and the box body. The interlayer bonding strength of the adhesive layer is less than the bonding strength of the adhesive layer and the first insulation layer of the first battery monomer. When the battery device is subjected to impact or is in a vibration working condition, the adhesive layer can be fractured between layers, so that the first battery monomer is separated from the box body. The connection between the adhesive layer and the first insulation layer is not easy to fail, and the insulation protection of the battery monomer in the area corresponding to the adhesive layer does not suddenly weaken, so that the battery monomer still has good reliability. The connection between the first insulation layer and the shell of the battery monomer is also not easy to fail due to the pulling of the adhesive layer, so that the first insulation layer can always provide insulation protection for the battery monomer, and the battery monomer has high reliability, thereby improving the reliability of the battery device.

[0008] In some embodiments of the first aspect of the application, the interlayer bonding strength of the adhesive layer is less than the connection strength of the first insulation layer of the first battery monomer and the shell.

[0009] In the technical solution, the interlayer bonding strength of the adhesive layer is less than the connection strength of the first insulation layer of the first battery monomer and the shell. Therefore, when the battery device is subjected to impact or is in a vibration working condition, the adhesive layer can be fractured between layers before the adhesive relationship between the adhesive layer and the first battery monomer fails. The first insulation layer and the shell can still have a good connection relationship. The connection between the first insulation layer and the shell of the battery monomer is not easy to fail due to the pulling of the adhesive layer, so that the first insulation layer can always provide insulation protection for the battery monomer, and the battery monomer has high reliability, thereby improving the reliability of the battery device.

[0010] In some embodiments of the first aspect of the application, the shell includes a side wall and a first end wall, the side wall surrounds the outer periphery of the first end wall and is connected to the first end wall, and the first end wall is located at one end of the side wall in a first direction. In the first direction, at least part of the first insulation layer of the first battery monomer is located between the adhesive layer and the first end wall of the first battery monomer and covers at least part of the outer surface of the first end wall.

[0011] In the technical solution, the at least part of the first insulating layer of the first battery cell is located between the adhesive layer and the first end wall of the first battery cell, so that the first end wall of the first battery cell and the box body are indirectly connected through the adhesive layer and the first insulating layer, which makes the connection of the first battery cell and the box body more convenient and helps to alleviate the influence of the setting of the adhesive layer on the energy density of the battery device.

[0012] In some embodiments of the first aspect of the application, the battery cell further comprises a second insulating layer, the second insulating layer is wrapped around the outer periphery of the side wall and covers at least part of the outer surface of the side wall.

[0013] In the technical solution, the battery cell further comprises a second insulating layer, the second insulating layer is wrapped around the outer periphery of the side wall and covers at least part of the outer surface of the side wall, which can reduce the moisture of the battery cell, reduce the corrosion effect of moisture on the battery cell, and reduce the risk of contact between the battery cell and the external environment, prolong the service life of the battery cell, and also reduce the risk of pollutants such as dust and moisture entering the interior of the battery cell affecting the performance of the battery cell, reduce the risk of the battery cell being damaged or short-circuited due to external impact, improve the reliability of the battery cell, and thus improve the reliability of the battery device.

[0014] In some embodiments of the first aspect of the application, the part of the first insulating layer and the part of the second insulating layer overlap to form an overlapping area.

[0015] In the technical solution, the part of the first insulating layer and the part of the second insulating layer overlap to form an overlapping area, so that in the overlapping area, one of the first insulating layer and the second insulating layer overlaps the other, and the one away from the shell can bind the one close to the shell, which helps to improve the connection stability of the first insulating layer and the second insulating layer, and also helps to reduce the process difficulty of setting the first insulating layer and the second insulating layer on the surface of the shell of the battery cell.

[0016] In some embodiments of the first aspect of the application, in the overlapping area, the first insulating layer is closer to the shell than the second insulating layer, and the first insulating layer connects the second insulating layer and the shell.

[0017] In the technical solution, the first insulating layer of the first battery cell is connected with the adhesive layer, in the overlapping area, the first insulating layer is closer to the shell than the second insulating layer, and the first insulating layer connects the second insulating layer and the shell, so that in the overlapping area, the second insulating layer has a binding effect on the first insulating layer, which enhances the connection stability of the first insulating layer and the shell and reduces the risk of the first insulating layer detaching from the shell when the battery device is impacted or in a vibration working condition.

[0018] In some embodiments of the first aspect of the present application, at least part of the overlapping region is located on the side wall.

[0019] In the technical solution, at least part of the overlapping region is located on the side wall, which facilitates the arrangement of the first insulating layer and makes the structure of the processing equipment simpler during the arrangement of the first insulating layer.

[0020] In some embodiments of the first aspect of the present application, the overlapping region includes a first area located on the side wall, and the size of the first area in the first direction is H1, 3mm≤H1≤20mm.

[0021] In the technical solution, the size of the first area of the overlapping region in the first direction is greater than or equal to 3mm, which makes the first insulating layer and the second insulating layer have a larger overlapping area on the side wall, thereby increasing the connection area of the first insulating layer and the second insulating layer, further improving the connection stability, and reducing the risk of warping of one of the first insulating layer and the second insulating layer away from the side wall, further improving the connection stability of the first insulating layer and the first end wall, the connection stability of the second insulating layer and the side wall, and the connection stability between the first insulating layer and the second insulating layer. The size of the first area of the overlapping region in the first direction is less than or equal to 20mm, which controls the overlapping area of the first insulating layer and the second insulating layer on the side wall within a reasonable range, which is conducive to reducing the volume of the battery monomer and improving the energy density of the battery device. Therefore, 3mm≤H1≤20mm, which is conducive to the connection stability of the first insulating layer and the second insulating layer, and also conducive to improving the energy density of the battery device.

[0022] In some embodiments of the first aspect of the present application, at least part of the overlapping region is located on the first end wall.

[0023] In the technical solution, at least part of the overlapping region is located on the first end wall, i.e., part of the first insulating layer and part of the second insulating layer overlap on the first end wall, so that one of the first insulating layer and the second insulating layer overlaps the other on the first end wall, and the one away from the first end wall can bind the one close to the first end wall, which is conducive to improving the connection stability of the first insulating layer and the second insulating layer, and also conducive to reducing the process difficulty of arranging the first insulating layer and the second insulating layer on the surface of the shell of the battery monomer.

[0024] In some embodiments of the first aspect of the present application, the overlapping region includes a second area located on the first end wall, and the width of the second area is W1, W1≥1mm.

[0025] In the technical solution, the width of the second region of the overlapping area is greater than or equal to 1 mm, so that the first insulating layer and the second insulating layer have a large overlapping area on the first end wall, thereby increasing the connection area of the first insulating layer and the second insulating layer, improving the connection stability, and reducing the risk of warping of one of the first insulating layer and the second insulating layer away from the first end wall, further improving the connection stability of the first insulating layer and the first end wall, the connection stability of the second insulating layer and the side wall, and the connection stability between the first insulating layer and the second insulating layer.

[0026] In some embodiments of the first aspect of the application, the housing further comprises a first corner wall connecting the first end wall and the side wall; the overlapping area comprises a first region on the side wall, a second region on the first end wall, and a third region on the first corner wall, the third region connecting the first region and the second region.

[0027] In the technical solution, the overlapping area of the first insulating layer and the second insulating layer comprises a first region on the side wall, a second region on the first end wall, and a third region on the first corner wall, the third region connecting the first region and the second region, so that the overlapping area of the first insulating layer and the second insulating layer is large, thereby increasing the connection area of the first insulating layer and the second insulating layer, improving the connection stability, and reducing the risk of warping of one of the first insulating layer and the second insulating layer away from the housing in the overlapping area, further improving the connection stability of the first insulating layer and the first end wall, the connection stability of the second insulating layer and the side wall, and the connection stability between the first insulating layer and the second insulating layer, and further reducing the process difficulty of arranging the first insulating layer and the second insulating layer in the housing.

[0028] In some embodiments of the first aspect of the application, in a plane parallel to the first direction, the length of the extension of the overlapping area along the outer surface of the housing is L, the distance between the end of the first region away from the first end wall and the surface of the second region away from the first end wall in the first direction is H, the distance between the end of the second region away from the side wall and the surface of the first region away from the side wall in the thickness direction of the side wall is b, and the overall size of the housing, the first insulating layer, and the second insulating layer in the first direction is U, L-b+0.8 mm≤H≤U-10 mm.

[0029] In the technical solution, H is greater than or equal to L-b+0.8 mm, so as to reduce the risk of creeping and the risk of short circuit of the battery monomer, improve the reliability of the battery monomer, and further improve the reliability of the battery device. H is less than or equal to U-10 mm, so as to control the overlapping area (the first area) of the first insulating layer and the second insulating layer on the side wall within a reasonable range, thereby reducing the volume of the battery monomer and improving the energy density of the battery device. Therefore, L-b+0.8 mm≤H≤U-10 mm can make the battery device have better reliability and higher energy density.

[0030] In some embodiments of the first aspect of the present application, the first insulating layer includes a first part that does not overlap with the second insulating layer, and the adhesive layer connects the box body and the first part of the first battery monomer.

[0031] In the technical solution, the adhesive layer connects the box body and the first part of the first battery monomer, so as to reduce the space occupied by the first battery monomer and the adhesive layer in the stacking direction of the first insulating layer and the adhesive layer, thereby reducing the size of the battery device in the stacking direction of the first insulating layer and the adhesive layer, and facilitating the improvement of the energy density of the battery device.

[0032] In some embodiments of the first aspect of the present application, the first insulating layer does not overlap with the side wall in the projection plane perpendicular to the thickness direction of the side wall.

[0033] In the technical solution, the first insulating layer does not overlap with the side wall in the projection plane perpendicular to the thickness direction of the side wall, that is, the first insulating layer does not extend to the side wall, so as to reduce the space occupied by the first insulating layer and the area of the overlapping area of the first insulating layer and the second insulating layer, thereby facilitating the reduction of the volume of the battery monomer and the improvement of the energy density of the battery device.

[0034] In some embodiments of the first aspect of the present application, the first insulating layer is entirely located on the first end wall.

[0035] In the technical solution, the first insulating layer is entirely located on the first end wall, so that the first insulating layer does not extend to the side wall, thereby reducing the space occupied by the first insulating layer and the area of the overlapping area of the first insulating layer and the second insulating layer, and facilitating the reduction of the volume of the battery monomer and the improvement of the energy density of the battery device.

[0036] In some embodiments of the first aspect of the present application, in the projection plane perpendicular to the first direction, the area of the orthographic projection of the first end wall is S1, the area of the orthographic projection of the first insulating layer is S2, and 0.5≤S2 / S1≤1.

[0037] In the technical solution, 0.5≤S2 / S1, so that the first insulating layer has sufficient area, facilitating the connection of the first insulating layer and the adhesive layer, and enabling the first insulating layer to better insulate and protect the first end wall, so that the battery monomer has better reliability. S2 / S1≤1, so that the first insulating layer is completely located on the first end wall, reducing the space occupied by the first insulating layer and the area of the overlapping region of the first insulating layer and the second insulating layer, which is beneficial to reducing the volume of the battery monomer and improving the energy density of the battery device. Therefore, 0.5≤S2 / S1≤1, so that the battery device has better reliability and energy density.

[0038] In some embodiments of the first aspect of the application, the shell further comprises a first corner wall, an outer surface of the first corner wall being connected to an outer surface of the side wall and an outer surface of the first end wall; and a portion of the first insulating layer covers at least a portion of the first corner wall.

[0039] In the technical solution, a portion of the first insulating layer covers at least a portion of the first corner wall, so that the first insulating layer covers both the first end wall and the first corner wall, and the first insulating layer has a larger coverage area, which can better insulate and protect the battery monomer and improve the reliability of the battery monomer, thereby improving the reliability of the battery device.

[0040] In some embodiments of the first aspect of the application, in a projection plane perpendicular to the first direction, an area of a projection of the first end wall is S1, and an area of a projection of the first insulating layer is S2, 1<S2 / S1≤1.2.

[0041] In the technical solution, 1<S2 / S1, so that the first insulating layer can cover both the first end wall and the first corner wall, and the first insulating layer has a larger coverage area, which can better insulate and protect the battery monomer and improve the reliability of the battery monomer, thereby improving the reliability of the battery device. S2 / S1≤1.2 controls the coverage area of the first insulating layer within a reasonable range, reduces the space occupied by the first insulating layer, and is beneficial to reducing the volume of the battery monomer and improving the energy density of the battery device. Therefore, 1<S2 / S1≤1.2 enables the battery device to have better reliability and energy density.

[0042] In some embodiments of the first aspect of the application, the second insulating layer does not extend to the first end wall.

[0043] In the technical solution, the second insulating layer does not extend to the first end wall, which can reduce the space occupied by the second insulating layer and the area of the overlapping region of the first insulating layer and the second insulating layer, which is beneficial to reducing the volume of the battery monomer and improving the energy density of the battery device.

[0044] In some embodiments of the first aspect of the present application, the connection strength between the first insulating layer and the first end wall is greater than the connection strength between the second insulating layer and the side wall.

[0045] In the above technical solution, since the adhesive layer connects the first insulating layer and the box body, and the connection strength between the first insulating layer and the first end wall is greater than the connection strength between the second insulating layer and the side wall, when the battery device is subjected to impact or is in a vibration working condition, the first insulating layer is not easy to be separated from the first end wall under the pulling of the adhesive layer, so that the first insulating layer can always insulate and protect the first battery monomer, thereby improving the reliability of the battery monomer.

[0046] In some embodiments of the first aspect of the present application, the first insulating layer is an insulating coating, and the second insulating layer is an insulating film.

[0047] In the above technical solution, the first insulating layer is an insulating coating, so that the connection strength between the first insulating layer and the shell is better. The second insulating layer is an insulating film, so that it is more convenient to arrange the second insulating layer on the shell.

[0048] In some embodiments of the first aspect of the present application, the connection strength between the first insulating layer and the first end wall is 5 MPa to 15 MPa.

[0049] In the above technical solution, the connection strength between the first insulating layer and the first end wall is greater than or equal to 5 MPa, so that the connection stability between the first insulating layer and the first end wall is better, and the first insulating layer is not easy to be separated from the first end wall. The connection strength between the first insulating layer and the first end wall is less than or equal to 15 MPa, which avoids that the connection strength between the first insulating layer and the first end wall is too large, thereby facilitating to reduce the process difficulty and control the production cost of the battery monomer. Therefore, the connection strength between the first insulating layer and the first end wall is 5 MPa to 15 MPa, so that the first insulating layer is not easy to be separated from the first end wall, and the production process difficulty of the battery monomer and the production cost of the battery monomer can be reduced.

[0050] In some embodiments of the first aspect of the present application, the connection strength between the first insulating layer and the first end wall is 7 MP to 11 MPa.

[0051] In the technical solution, the connection strength between the first insulation layer and the first end wall is greater than or equal to 7 MPa, so that the connection stability between the first insulation layer and the first end wall is better, and the first insulation layer is not easy to separate from the first end wall. The connection strength between the first insulation layer and the first end wall is less than or equal to 11 MPa, so as to avoid that the connection strength between the first insulation layer and the first end wall is too large, thereby facilitating further reduction of the process difficulty and control of the production cost of the battery monomer. Therefore, the connection strength between the first insulation layer and the first end wall is 7 MPa to 11 MPa, so that the first insulation layer is not easy to separate from the first end wall, and the production process difficulty of the battery monomer can be further reduced and the production cost of the battery monomer can be controlled.

[0052] In some embodiments of the first aspect of the application, the battery device further comprises a thermal management component for managing the temperature of the battery monomers; a portion of the first insulation layer and a portion of the second insulation layer overlap to form an overlapping area, the overlapping area comprises a first area on the side wall; a plurality of battery monomers are arranged along a second direction, and the thermal management component is arranged between two adjacent battery monomers along the second direction; the second insulation layer comprises a second portion that does not overlap with the first insulation layer, and the thermal management component directly or indirectly abuts against the second portion; the first area and the thermal management component are not in contact; and the first direction intersects the second direction.

[0053] In the technical solution, the battery device further comprises a thermal management component, and the temperature of the battery monomers is managed by the thermal management component, so that the temperature of the battery monomers can be within a normal range, so as to meet the temperature requirement of fully charging the battery monomers and improve the reliability of the battery monomers, thereby improving the reliability of the battery device. The thermal management component directly or indirectly abuts against the second portion, so as to facilitate the thermal management component to manage the temperature of the battery monomers and improve the heat exchange efficiency. The first area and the thermal management component are not in contact, so as to reduce the risk of interference between the first area and the thermal management component, so that the thermal management component can stably abut against the second portion, and the thermal management component can effectively adjust the temperature of the battery monomers.

[0054] In some embodiments of the first aspect of the application, along the second direction, the first area and the thermal management component have a gap therebetween.

[0055] In the technical solution, the first area and the thermal management component have a gap therebetween, the gap can provide space for the expansion of the battery monomers, and the risk of interference between the second area and the thermal management component after the expansion of the battery monomers is reduced, so that the thermal management component can stably abut against the second portion, and the thermal management component can effectively adjust the temperature of the battery monomers.

[0056] In some embodiments of the first aspect of the present application, the battery device further comprises a thermal management component for managing the temperature of the battery cells; a portion of the first insulating layer and a portion of the second insulating layer overlap to form an overlapping region, the overlapping region comprises a first area on the side wall; a plurality of the battery cells are arranged along a second direction, along the second direction, the thermal management component is arranged between two adjacent battery cells, the thermal management component has an avoiding portion configured to avoid the first area.

[0057] In the above technical solution, the battery device further comprises a thermal management component, which is used to manage the temperature of the battery cells, so that the temperature of the battery cells can be within a normal range, thereby meeting the temperature requirement of fully charging the battery cells and improving the reliability of the battery cells. The thermal management component has an avoiding portion, which can avoid the first area, thereby reducing the risk of interference between the first area and the thermal management component, so that the thermal management component can stably abut against other areas of the battery cells directly or indirectly, and the thermal management component can effectively adjust the temperature of the battery cells.

[0058] In some embodiments of the first aspect of the present application, along the first direction, the thermal management component comprises a first segment and a second segment connected in series, the first segment is closer to the first area than the second segment, the thickness of the first segment is smaller than the thickness of the second segment, and the side of the first segment facing the first area forms the avoiding portion.

[0059] In the above technical solution, by setting the thickness of the first segment of the thermal management component opposite to the first area to be smaller, the avoiding portion is formed on the side of the first segment facing the first area, which not only reduces the risk of interference between the thermal management component and the first area, but also makes the thermal management component have a larger size in the first direction, so that the thermal management component has a larger surface area, and the thermal management component has a larger heat exchange area, thereby improving the adjustment efficiency of the temperature in the box.

[0060] In some embodiments of the first aspect of the present application, the thickness of the thermal management component gradually decreases from the middle of the thermal management component along the first direction to both ends, so as to form the avoiding portion on the side of the thermal management component facing the first area.

[0061] In the above technical solution, by gradually reducing the thickness of the thermal management component from the middle of the thermal management component along the first direction to both ends, the thickness of the area of the thermal management component opposite to the first area is smaller, so that the avoiding portion is formed on the side of the thermal management component facing the first area, which not only reduces the risk of interference between the thermal management component and the first area, but also makes the thermal management component have a larger surface area, so that the thermal management component has a larger heat exchange area, thereby improving the adjustment efficiency of the temperature in the box.

[0062] In some embodiments of the first aspect of the application, the battery device further comprises a thermal management component for managing the temperature of the battery cells; a portion of the first insulating layer and a portion of the second insulating layer overlap to form an overlapping region, the overlapping region comprises a first area on the side wall; a plurality of the battery cells are arranged along a second direction, along the second direction, the thermal management component is arranged between two adjacent battery cells, the projection of the thermal management component on the first area does not overlap.

[0063] In the above technical solution, the projection of the thermal management component on the first area does not overlap, which reduces the risk of interference between the first area and the thermal management component, so that the thermal management component can stably abut against the area other than the first area of the battery cell, and the thermal management component can effectively adjust the temperature of the battery cell. In addition, space can be provided for the expansion of the battery cell. After the expansion of the battery cell, the second area and the thermal management component do not interfere, so that the thermal management component can stably abut against the area other than the first area of the battery cell, thereby enabling the thermal management component to effectively adjust the temperature of the battery cell.

[0064] In some embodiments of the first aspect of the application, the outer surface of the first end wall has a fourth area which is not covered by the second insulating layer, and in a projection plane perpendicular to the first direction, the area of the orthogonal projection of the fourth area is greater than the area of the orthogonal projection of the adhesive layer.

[0065] In the above technical solution, in the projection plane perpendicular to the first direction, the area of the orthogonal projection of the fourth area is greater than the area of the orthogonal projection of the adhesive layer, which reduces the risk of glue overflow during the bonding of the box body and the first battery cell, improves the quality of the battery device, and improves customer satisfaction.

[0066] In some embodiments of the first aspect of the application, the housing comprises a shell and an end cover, the shell has an opening, and the end cover closes the opening. The shell comprises a first end wall and a side wall, and the first end wall is arranged opposite to the end cover.

[0067] In the above technical solution, the first end wall is arranged opposite to the end cover, the first insulating layer covers the first end wall, and the adhesive layer connects the first insulating layer and the box body, which reduces the risk of structural interference on the adhesive layer and the end cover, and improves the reliability of the battery device.

[0068] In some embodiments of the first aspect of the application, the end cover supports the electrode assembly.

[0069] In the above technical solution, the end cover supports the electrode assembly, and the first end wall is located above the battery cell, which facilitates the connection of the first battery cell and the box body.

[0070] In some embodiments of the first aspect of the application, the box comprises a connecting portion opposite the first end wall in the first direction, and the adhesive layer connects the first insulating layer and the connecting portion.

[0071] In the technical solution, the first end wall and the connecting portion are arranged opposite to each other in the first direction, and the first insulating layer covers the first end wall. At least part of the first insulating layer and the connecting portion are arranged opposite to each other in the first direction, and the adhesive layer connects the first insulating layer and the connecting portion. This makes the connection more convenient, and the distance between the first insulating layer and the connecting portion is shorter, which is conducive to reducing the size of the adhesive layer in the first direction, thereby being conducive to reducing the space occupied by the adhesive layer, and further being conducive to improving the energy density of the battery device.

[0072] In some embodiments of the first aspect of the application, the thickness of the first insulating layer is T, and 60 μm≤T≤240 μm.

[0073] In the technical solution, the thickness of the first insulating layer is greater than or equal to 60 μm, so that the first insulating layer has good insulation and protection performance, and the reliability of the battery monomer is improved, and the reliability of the battery device is further improved. The thickness of the first insulating layer is less than or equal to 240 μm, which reduces the space occupied by the first insulating layer, is conducive to improving the energy density of the battery device, and is also convenient for assembly. Therefore, 60 μm≤T≤240 μm makes the battery device have good reliability and energy density.

[0074] In some embodiments of the first aspect of the application, the interlayer adhesive strength of the adhesive layer is less than the adhesive strength of the adhesive layer and the box.

[0075] In the technical solution, the interlayer adhesion strength of the adhesion layer is less than the adhesion strength between the adhesion layer and the box, when the battery device is subjected to impact or is in a vibration working condition, the adhesion layer can be fractured from the interlayer of the adhesion layer before the adhesion relationship between the adhesion layer and the box fails, and then a part of the adhesion layer can still be adhered to the first battery monomer. In the case that the battery monomer has no insulating layer in the region connected with the adhesion layer, the part of the adhesion layer adhered to the shell of the battery monomer can protect the battery monomer, for example, insulating protection, reducing the risk of short circuit, overcharge, overdischarge and other problems between the battery monomer and other components, for example, reducing the risk of pollution and corrosion caused by the contact between the shell of the battery monomer and the external environment, improving the reliability of the battery monomer, and thus improving the reliability of the battery device. In the case that the surface of the battery monomer connected with the adhesion layer is an insulating layer, the part of the adhesion layer adhered to the surface of the insulating layer and the insulating layer can jointly protect the battery monomer, and the battery monomer has two-layer insulating protection in the connection region of the adhesion layer, thereby improving the reliability of the battery monomer. The other part of the adhesion layer is adhered to the box, so that the corresponding region of the box still has insulating performance and can play an insulating protection role between the box and the battery monomer, thereby improving the reliability of the battery device.

[0076] In a second aspect, the embodiments of the present application provide a battery device, which comprises the battery device provided by any one of the embodiments of the first aspect.

[0077] In the technical solution, the battery device provided by any one of the embodiments of the first aspect has good reliability, which is beneficial to improving the power utilization reliability of the power utilization device powered by the battery device. BRIEF DESCRIPTION OF DRAWINGS

[0078] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0079] Figure 1 The structural schematic diagram of the vehicle provided by some embodiments of the present application is shown in the figure;

[0080] Figure 2 The exploded view of the battery device provided by some embodiments of the present application is shown in the figure;

[0081] Figure 3 The exploded view of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0082] Figure 4 The structural schematic diagram of the battery device provided by some embodiments of the present application is shown in the figure;

[0083] Figure 5 Structure diagram of battery cell provided for some embodiments of the present application;

[0084] Figure 6 Structure diagram of battery cell provided for some embodiments of the present application; Figure 5 Cross-sectional view in A1-A1 direction;

[0085] Figure 7 Structure diagram of battery cell provided for some embodiments of the present application;

[0086] Figure 8 Structure diagram of battery cell provided for some embodiments of the present application; Figure 7 Cross-sectional view in A2-A2 direction;

[0087] Figure 9 Structure diagram of battery cell provided for some embodiments of the present application;

[0088] Figure 10 Structure diagram of battery cell provided for some embodiments of the present application; Figure 9 Cross-sectional view in A3-A3 direction;

[0089] Figure 11 Structure diagram of battery cell provided for some embodiments of the present application;

[0090] Figure 12 Structure diagram of battery cell provided for some embodiments of the present application; Figure 11 Cross-sectional view in A4-A4 direction;

[0091] Figure 13 Structure diagram of battery cell and thermal management component provided for some embodiments of the present application;

[0092] Figure 14 Structure diagram of battery cell and thermal management component provided for some embodiments of the present application; Figure 13 Enlarged view at B1;

[0093] Figure 15 Structure diagram of battery cell and thermal management component provided for some embodiments of the present application;

[0094] Figure 16 Structure diagram of battery cell and thermal management component provided for some embodiments of the present application; Figure 15 Enlarged view at B2;

[0095] Figure 17 Structure diagram of battery cell and thermal management component provided for some embodiments of the present application;

[0096] Figure 18 Structure diagram of battery cell and thermal management component provided for some embodiments of the present application; Figure 17 Enlarged view at B3.

[0097] Icon: 1000 - vehicle; 100 - battery device; 10 - case; 11 - first case; 12 - second case; 13 - connecting portion; 20 - battery cell; 20a - first battery cell; 21 - housing; 211 - casing; 2111 - opening; 2112 - side wall; 2113 - first end wall; 21131 - fourth region; 2114 - first corner wall; 212 - end cap; 212' - second end wall; 22 - electrode assembly; 23 - electrode terminal; 24 - current collector member; 25 - first insulating layer; 251 - first portion; 26 - second insulating layer; 261 - second portion; 27 - pressure relief member; 28 - liquid injection hole; 30 - adhesive layer; 40 - thermal management member; 41 - first section; 42 - second section; Q - overlap region; Q1 - first region; Q2 - second region; Q3 - third region; M - gap; P - avoidance portion; X - first direction; Y - second direction. DETAILED DESCRIPTION

[0098] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0099] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second", and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0100] In the present application, the phrase "embodiment" means that the specific features, structures, or properties described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiment, nor is each necessarily a separate or alternative embodiment to the others.

[0101] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "attach" should be broadly interpreted, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0102] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0103] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0104] "Multiple" appearing in the present application means two or more (including two).

[0105] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0106] The battery cell includes but is not limited to lithium ion battery, sodium ion battery, sodium lithium ion battery, lithium metal battery, sodium metal battery, lithium sulfur battery, magnesium ion battery, nickel hydrogen battery, nickel cadmium battery, lead-acid battery, etc.

[0107] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0108] In some embodiments, the positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0109] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0110] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0111] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material of a battery cell can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (which can also be referred to simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and modified compounds thereof, etc.

[0112] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is employed as the positive electrode, the foamed metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal. The lithium source material can be lithium metal and / or a lithium-rich material.

[0113] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0114] As an example, the negative electrode current collector can employ a metal foil, foamed metal, or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0115] As an example, the negative electrode tab can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0116] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0117] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0118] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0119] In some embodiments, the separator is a separator film. The separator film can be any porous structure separator film known to have good chemical stability and mechanical stability.

[0120] As an example, the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different. The separator can be a separate component between the positive and negative electrodes or can be attached to the surface of the positive and negative electrodes.

[0121] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes and functions to transport ions and separate the positive and negative electrodes.

[0122] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0123] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium di-oxalate borate, lithium difluoro di-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0124] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyrosulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0125] Among them, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0126] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0127] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, a cellulose, or the like.

[0128] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0129] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0130] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0131] In some embodiments, the electrode assembly is in a stack structure.

[0132] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0133] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments that are stacked.

[0134] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked.

[0135] As an example, a plurality of separators can be provided, and each of the separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0136] As an example, the separators can be continuously provided and provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0137] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, or the like.

[0138] In some embodiments, the electrode assembly is provided with a tab. The tab can guide current out of the electrode assembly. The tab includes a positive electrode tab and a negative electrode tab.

[0139] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, or the like.

[0140] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, etc.

[0141] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0142] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module.

[0143] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0144] In some embodiments, the battery device can be a battery pack, which can include a box and one or more battery cell assemblies accommodated in the box.

[0145] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0146] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0147] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0148] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0149] As an example, the box can be part of the chassis structure of a vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0150] In some embodiments, the battery device refers to an energy storage device, which includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0151] In the related art, a battery device includes a box body and a battery cell, the battery cell is accommodated in the box body, in order to improve the stability of the battery cell in the box body, the battery cell is connected with the box body through an adhesive layer, if there is no insulating layer in the area where the battery cell is connected with the adhesive layer, the adhesive layer can replace the insulating layer to protect the battery cell, such as insulating protection, reducing the risk of short circuit, overcharge, overdischarge and other problems between the battery cell and other components, for example, reducing the risk of pollution and corrosion caused by the contact between the shell of the battery cell and the external environment, if the connection strength between the battery cell and the adhesive layer is too weak, the adhesive layer and the battery cell are easy to separate when the battery device is subjected to impact or is in a vibration working condition, so that the area of the battery cell originally connected with the adhesive layer and protected by the adhesive layer is exposed, the adhesive layer cannot insulate and protect this area, reducing the reliability of the battery cell, thereby reducing the reliability of the battery device.

[0152] If the surface of the battery cell connected with the adhesive layer is an insulating layer, there are two layers of insulating protection, the insulating layer and the adhesive layer, in the connection area between the battery cell and the adhesive layer, if the connection strength between the insulating layer of the battery cell and the adhesive layer is too weak, the connection relationship between the adhesive layer and the insulating layer is easy to fail when the battery device is subjected to impact or is in a vibration working condition, resulting in a sudden weakening of the insulating protection of the battery cell in the area corresponding to the adhesive layer, thereby reducing the reliability of the battery cell; if the connection strength between the insulating layer of the battery cell and the adhesive layer is too strong, the connection relationship between the adhesive layer and the insulating layer is not easy to fail when the battery device is subjected to impact or is in a vibration working condition, but the connection relationship between the insulating layer and the shell of the battery cell is easy to fail, resulting in the separation of the insulating layer from the shell of the battery cell, so that neither the adhesive layer nor the insulating layer insulates and protects the battery cell, reducing the reliability of the battery cell, thereby reducing the reliability of the battery device.

[0153] Based on the above considerations, in order to improve the reliability of the battery device, the embodiments of the present application provide a battery device, the battery device includes a box body, a plurality of battery cells and an adhesive layer; the plurality of battery cells are accommodated in the box body, the plurality of battery cells include at least one first battery cell, and the adhesive layer connects the box body and the first battery cell; wherein the interlayer adhesive strength of the adhesive layer is less than the adhesive strength between the adhesive layer and the first battery cell.

[0154] The box and the first battery monomer are connected through the adhesive layer, the stability of the first battery monomer in the box is improved, and the reliability of the battery device is improved. The interlayer bonding strength of the adhesive layer is less than the bonding strength of the adhesive layer and the first battery monomer. When the battery device is subjected to impact or is in a vibration working condition, the adhesive layer can be broken from the interlayer of the adhesive layer before the adhesive relationship between the adhesive layer and the first battery monomer fails. Then, the adhesive layer can still be partially bonded to the battery monomer. In the case where there is no insulating layer in the area of the battery monomer connected to the adhesive layer, the part of the adhesive layer bonded to the shell of the battery monomer can protect the battery monomer. For example, the adhesive layer can provide insulation protection for the battery monomer, reduce the risk of short circuit, overcharge, overdischarge, and other problems between the battery monomer and other components. For another example, the adhesive layer can reduce the contact between the shell of the battery monomer and the external environment, reduce the risk of pollution and corrosion, and improve the reliability of the battery monomer, thereby improving the reliability of the battery device. When the surface of the battery monomer connected to the adhesive layer is an insulating layer, the part of the adhesive layer bonded to the surface of the insulating layer and the insulating layer can jointly protect the battery monomer. The battery monomer has two layers of insulating protection in the connection area of the battery monomer and the adhesive layer, which improves the reliability of the battery monomer. When the battery device is subjected to impact or is in a vibration working condition, the adhesive layer can be broken through the interlayer to separate the first battery monomer from the box. The connection relationship between the adhesive layer and the insulating layer is not easy to fail, and the insulating protection of the battery monomer in the area corresponding to the adhesive layer does not suddenly weaken, so that the battery monomer still has good reliability. Moreover, the connection relationship between the insulating layer and the shell of the battery monomer is not easy to fail due to the pulling of the adhesive layer, so that the insulating layer can always protect the battery monomer, and the battery monomer has high reliability, thereby improving the reliability of the battery device.

[0155] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0156] The following embodiments are described for convenience with the electric device being a vehicle.

[0157] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the vehicle 1000 provided by some embodiments of the present application is shown. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000.

[0158] The vehicle 1000 can further include a controller and a motor, and the controller is configured to control the battery device 100 to supply power to the motor, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0159] In some embodiments of the present application, the battery device 100 can not only serve as a power source for the operation of the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0160] Please refer to Figure 2 , Figure 2 The battery device 100 provided in some embodiments of the present application can include a box body 10 and a battery cell 20, and the box body 10 is configured to accommodate the battery cell 20.

[0161] The box body 10 can be formed with a closed space inside for accommodating the battery cell 20. The box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 are buckled to each other. The first box body 11 and the second box body 12 can have various shapes, such as a cuboid, a cylinder, etc. The first box body 11 can be a hollow structure with one side open, and the second box body 12 can also be a hollow structure with one side open. The open side of the second box body 12 is buckled to the open side of the first box body 11, and the box body 10 with a closed space is formed. Alternatively, the first box body 11 can be a hollow structure with one side open, and the second box body 12 can be a plate structure. The second box body 12 is buckled to the open side of the first box body 11, and the box body 10 with an accommodation space is formed.

[0162] In the battery device 100, the battery cell 20 can be one or multiple. If the battery cell 20 is multiple, the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box body 10. Alternatively, all the battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and the whole formed by all the battery cells 20 is accommodated in the box body 10.

[0163] In some embodiments, the battery device 100 can further include a busbar component (not shown in the figure), and the multiple battery cells 20 can be electrically connected through the busbar component to realize the series connection, parallel connection or mixed connection of the multiple battery cells 20. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0164] Please refer to Figure 3 , Figure 3An exploded view of a battery cell 20 is provided for some embodiments of the present application. The battery cell 20 can include a housing 21 and an electrode assembly 22, the electrode assembly 22 being accommodated in the housing 21.

[0165] In some embodiments, the housing 21 can include a shell 211 having an opening 2111 and an end cover 212 closing the opening 2111 of the shell 211. Here, closing means covering or closing, which can be sealed or unsealed.

[0166] The shell 211 is a component for accommodating the electrode assembly 22, and the shell 211 can be a hollow structure having an opening 2111 at one end or at opposite ends. The shell 211 can be in various shapes, such as a cylindrical shape, a cuboid shape, etc. The shell 211 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assembly 22 can be partially or entirely accommodated in the shell 211.

[0167] The end cover 212 cooperates with the shell 211 to define a receiving space for accommodating the electrode assembly 22 and other components. The end cover 212 can be connected to the shell 211 by welding, crimping, etc., to close the opening 2111 of the shell 211. The end cover 212 can be in a shape suitable for the shell 211, such as a rectangular plate structure for a cuboid shell 211 or a circular plate structure for a cylindrical shell 211. The end cover 212 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The end cover 212 and the shell 211 can be made of the same material or different materials.

[0168] In embodiments where the shell 211 has an opening 2111 at one end, one end cover 212 can be provided. In embodiments where the shell 211 has openings 2111 at opposite ends, two end covers 212 can be provided, each closing an opening 2111 of the shell 211, and the two end covers 212 cooperates with the shell 211 to define the receiving space.

[0169] In some embodiments, the battery cell 20 can further include electrode terminals 23 disposed on the outer shell 21, the electrode terminals 23 being electrically connected to the tabs of the electrode assembly 22 for inputting or outputting electric energy of the battery cell 20. The electrode terminals 23 can be disposed on the housing 211 of the outer shell 21 or on the end cover 212 of the outer shell 21. The electrode terminals 23 can be directly connected to the tabs, for example, by welding. The electrode terminals 23 can also be indirectly connected to the tabs, for example, through a current collecting member 24. The current collecting member 24 can be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0170] As an example, as shown in Figure 3 the housing 211 has an opening 2111 at one end, and the outer shell 21 has one end cover 212, which closes one opening 2111 of the housing 211. The end cover 212 is provided with two electrode terminals 23, which are a positive electrode terminal and a negative electrode terminal, respectively. The electrode assembly 22 has a positive tab and a negative tab at the end facing the end cover 212. The positive electrode terminal is electrically connected to the positive tab, and the negative electrode terminal is electrically connected to the negative tab.

[0171] Please refer to Figure 4 , Figure 4 a structural schematic diagram of a battery device 100 provided by some embodiments of the application. The embodiments of the application provide a battery device 100, which includes a box body 10, a plurality of battery cells 20, and an adhesive layer 30. The plurality of battery cells 20 are accommodated in the box body 10, and the plurality of battery cells 20 include at least one first battery cell 20a. The adhesive layer 30 connects the box body 10 and the first battery cell 20a. The interlayer adhesive strength of the adhesive layer 30 is less than the adhesive strength of the adhesive layer 30 and the first battery cell 20a.

[0172] The adhesive layer 30 can be formed by applying an adhesive on the first battery cell 20a and / or the box body 10, and then solidifying the adhesive. The adhesive can be one or more of a thermosetting resin such as epoxy resin, phenolic resin, urea-formaldehyde resin, polyurethane, and a thermoplastic resin such as polyvinyl acetal, perchloroethylene resin, and a synthetic rubber such as chloroprene rubber and nitrile rubber.

[0173] The adhesive layer 30 can also be adhesive paper.

[0174] The interlayer adhesive strength of the adhesive layer 30 can be the maximum stress that the adhesive layer 30 can withstand when it is broken or when it is divided into two parts, i.e., the cohesive strength of the adhesive layer 30.

[0175] The adhesion strength between the adhesion layer 30 and the first battery cell 20a refers to the adhesion force borne by the unit adhesion surface between the adhesion layer 30 and the first battery cell 20a, and is the maximum stress borne by the unit area of the adhesion surface between the adhesion layer 30 and the first battery cell 20a when the adhesion layer 30 and the first battery cell 20a are separated.

[0176] The first battery cell 20a refers to all the battery cells 20 connected to the case 10 through the adhesion layer 30 among the battery cells 20. Among the plurality of battery cells 20, some battery cells 20 can be connected to the case 10 through the adhesion layer 30, and only some of the plurality of battery cells 20 are the first battery cells 20a. All the battery cells 20 can also be connected to the case 10 through the adhesion layer 30, and each of the battery cells 20 is the first battery cell 20a.

[0177] The test method for comparing the interlayer adhesion strength of the adhesion layer 30 and the adhesion strength between the adhesion layer 30 and the first battery cell 20a is as follows:

[0178] ①. Prepare a battery device 100 sample, wherein the first battery cell 20a and the case 10 in the battery device 100 are connected through the adhesion layer 30.

[0179] ②. The upper and lower clamps are respectively arranged on the tensile testing machine, and the case 10 and the first battery cell 20a of the sample are clamped on the upper and lower clamps respectively, so that the tensile direction is consistent with the force line of the testing machine. After the connection between the case 10 and the first battery cell 20a of the sample is invalid, the position of the connection failure between the case 10 and the first battery cell 20a is observed. If the interlayer interface of the adhesion layer 30 is damaged, the adhesion between the first battery cell 20a and the adhesion layer 30 is stable, and the interlayer adhesion strength of the adhesion layer 30 is less than the adhesion strength between the first battery cell 20a and the adhesion layer 30. If the adhesion between the first battery cell 20a and the adhesion layer 30 is invalid, and the interlayer interface of the adhesion layer 30 is not damaged, the interlayer adhesion strength of the adhesion layer 30 is greater than the adhesion strength between the first battery cell 20a and the adhesion layer 30.

[0180] The box 10 and the first battery cell 20a are connected through the adhesive layer 30, the stability of the first battery cell 20a in the box 10 is improved, and the reliability of the battery device 100 is improved. The interlayer bonding strength of the adhesive layer 30 is less than the bonding strength of the adhesive layer 30 and the first battery cell 20a. When the battery device 100 is subjected to impact or is in a vibration working condition, the adhesive layer 30 can first break from the interlayer of the adhesive layer 30 before the adhesive relationship between the adhesive layer 30 and the first battery cell 20a fails. Then, a part of the adhesive layer 30 can still be bonded to the first battery cell 20a. In the case where there is no insulating layer in the area of the battery cell 20 connected with the adhesive layer 30, the part of the adhesive layer 30 bonded to the outer shell 21 of the battery cell 20 can protect the battery cell 20, such as insulating protection, reducing the risk of short circuit, overcharge, overdischarge, and other problems between the battery cell 20 and other components. For example, reducing the contact between the outer shell 21 of the battery cell 20 and the external environment, reducing the risk of pollution and corrosion, improving the reliability of the battery cell 20, and thus improving the reliability of the battery device 100. In the case where the surface of the battery cell 20 connected with the adhesive layer 30 is an insulating layer, the part of the adhesive layer 30 bonded to the surface of the insulating layer and the insulating layer can jointly protect the battery cell 20. In the case where the connection area of the battery cell 20 and the adhesive layer 30 has two layers of insulating protection, the adhesive layer 30 and the insulating layer, the reliability of the battery cell 20 is improved. When the battery device 100 is subjected to impact or is in a vibration working condition, the adhesive layer 30 can break through the interlayer to separate the first battery cell 20a from the box 10. The connection relationship between the adhesive layer 30 and the insulating layer is not easy to fail, and the insulating protection of the battery cell 20 in the area corresponding to the adhesive layer 30 does not suddenly weaken, so that the battery cell 20 still has good reliability. The connection relationship between the insulating layer and the outer shell 21 of the battery cell 20 is also not easy to fail due to the pulling of the adhesive layer 30, so that the insulating layer can always protect the battery cell 20, so that the battery cell 20 has high reliability, and thus the battery device 100 has good reliability.

[0181] In combination with reference Figures 4-6 In some embodiments, the battery cell 20 includes an outer shell 21, an electrode assembly 22, and a first insulating layer 25. The electrode assembly 22 is contained in the outer shell 21, and the first insulating layer 25 is connected to the outer shell 21 and covers at least part of the outer surface of the outer shell 21. The adhesive layer 30 connects the first insulating layer 25 of the first battery cell 20a and the box 10. The interlayer bonding strength of the adhesive layer 30 is less than the bonding strength of the adhesive layer 30 and the first insulating layer 25 of the first battery cell 20a.

[0182] The first insulation layer 25 is connected to the outer surface of the outer shell 21. There are various ways for the first insulation layer 25 to be connected to the outer surface of the outer shell 21. For example, the first insulation layer 25 can be directly or adhesively connected to the outer surface of the outer shell 21, the first insulation layer 25 can be electrostatically attached to the outer surface of the outer shell 21, and so on. Exemplarily, the first insulation layer 25 and the first end wall 2113 are adhesively connected through a glue layer, so as to indirectly connect the first insulation layer 25 and the first end wall 2113, which is conducive to improving the connection stability between the first insulation layer 25 and the first end wall 2113. Directly adhesively connecting the first insulation layer 25 and the first end wall 2113 can reduce the overall size of the battery monomer 20 after the first insulation layer 25 is arranged on the first end wall 2113, thereby being conducive to improving the energy density of the battery device 100.

[0183] The first insulation layer 25 can cover the entire outer surface of the outer shell 21, or can only cover a part of the outer surface of the outer shell 21.

[0184] The adhesive layer 30 connects the first insulation layer 25 of the first battery monomer 20a and the box body 10, in other words, the adhesive layer 30 is adhesively connected to the outer surface of the first insulation layer 25 of the first battery monomer 20a, and the adhesive layer 30 is adhesively connected to the box body 10.

[0185] In the present embodiment, the adhesive strength between the adhesive layer 30 and the first insulation layer 25 of the first battery monomer 20a is the aforementioned adhesive strength between the adhesive layer 30 and the first battery monomer 20a, that is, the adhesive force borne by the unit adhesive surface between the adhesive layer 30 and the first insulation layer 25 of the first battery monomer 20a, is the unit area of the adhesive surface between the adhesive layer 30 and the first insulation layer 25 of the first battery monomer 20a, and is the maximum stress borne when the adhesive layer 30 and the first insulation layer 25 of the first battery monomer 20a are separated.

[0186] The material of the first insulation layer 25 includes epoxy resin, acrylic resin, acrylic ink, polyimide, etc., and can also be a mixture in which one or more of epoxy resin, acrylic resin, acrylic ink, and polyimide is a main component. The first insulation layer 25 can be attached to the surface of the outer shell 21 by spraying, electrophoresis, printing, etc.

[0187] The first insulation layer 25 is arranged on the outer surface of the battery monomer 20, which can reduce the moisture of the battery monomer 20, reduce the corrosion of the battery monomer 20 by moisture, and reduce the risk of contact between the battery monomer 20 and the external environment, prolong the service life of the battery monomer 20, and also reduce the entry of pollutants into the inside of the battery monomer 20, such as dust, moisture and other impurities affecting the performance of the battery monomer 20, reduce the risk of contact between the battery monomer 20 and other hard objects, thereby reducing the risk of damage or short circuit of the battery monomer 20 caused by external impact, improving the reliability of the battery monomer 20, and thus improving the reliability of the battery device 100. The adhesive layer 30 connects the first insulation layer 25 of the first battery monomer 20a and the box body 10, which facilitates the connection of the first battery monomer 20a and the box body 10. The interlayer bonding strength of the adhesive layer 30 is less than the bonding strength of the adhesive layer 30 and the first insulation layer 25 of the first battery monomer 20a. When the battery device 100 is subjected to impact or is in a vibration working condition, the adhesive layer 30 can be broken through the interlayer to separate the first battery monomer 20a from the box body 10. The connection between the adhesive layer 30 and the first insulation layer 25 is not easy to fail, and the insulation protection of the battery monomer 20 in the area corresponding to the adhesive layer 30 will not suddenly weaken, so that the battery monomer 20 still has good reliability; and the connection between the first insulation layer 25 and the shell 21 of the battery monomer 20 is also not easy to fail due to the pulling of the adhesive layer 30, so that the first insulation layer 25 can always play an insulation protection role for the battery monomer 20, so that the battery monomer 20 has high reliability, thereby making the battery device 100 have good reliability.

[0188] In some embodiments, the interlayer bonding strength of the adhesive layer 30 is less than the connection strength of the first insulation layer 25 of the first battery monomer 20a and the shell 21.

[0189] The connection strength of the first insulation layer 25 and the shell 21 can be the maximum stress borne when the connection between the first insulation layer 25 and the shell 21 of the first battery monomer 20a is destroyed.

[0190] According to different connection manners of the first insulation layer 25 and the shell 21, the connection strength between the first insulation layer 25 and the shell 21 is different. For example, if the first insulation layer 25 and the shell 21 are directly bonded, the connection strength between the first insulation layer 25 and the shell 21 can be the bonding strength between the first insulation layer 25 and the shell 21. For another example, if the first insulation layer 25 and the shell 21 are indirectly bonded through a glue layer, the connection strength between the first insulation layer 25 and the shell 21 can be the bonding strength between the glue layer and the first insulation layer 25, the interlayer bonding strength of the glue layer, or the bonding strength between the glue layer and the shell 21. For another example, if the first insulation layer 25 and the shell 21 are connected through other connection structures (such as bolts), the connection strength between the first insulation layer 25 and the shell 21 can be the fracture strength of the connection structure (such as the bolt).

[0191] When the battery device 100 is subjected to impact or is in a vibration working condition, the interlayer bonding strength of the bonding layer 30 is less than the connection strength between the first insulation layer 25 and the shell 21 of the first battery monomer 20a, the bonding layer 30 can be first fractured from the interlayer of the bonding layer 30 before the bonding relationship between the bonding layer 30 and the first battery monomer 20a fails, and the first insulation layer 25 and the shell 21 can still have a good connection relationship. The connection relationship between the first insulation layer 25 and the shell 21 of the battery monomer 20 is not easy to fail due to the pulling of the bonding layer 30, so that the first insulation layer 25 can always play an insulating protection role for the battery monomer 20, so that the battery monomer 20 has high reliability, thereby making the battery device 100 have good reliability.

[0192] Please continue to refer to Figures 4-6 As shown in FIG. 1, in some embodiments, the shell 21 includes a side wall 2112 and a first end wall 2113, the side wall 2112 surrounds the outer periphery of the first end wall 2113 and is connected with the first end wall 2113, and the first end wall 2113 is located at one end of the side wall 2112 along the first direction X. At least part of the first insulation layer 25 of the first battery monomer 20a is located between the bonding layer 30 and the first end wall 2113 of the first battery monomer 20a and covers at least part of the outer surface of the first end wall 2113 along the first direction X.

[0193] The side wall 2112 is part of a wall portion of the shell 211. Along the circumference of the first end wall 2113, the side wall 2112 surrounds a closed frame. The shape of the frame surrounded by the side wall 2112 can be various, such as a rectangular frame, and the battery monomer 20 can be a square shell battery. The side wall 2112 surrounds a cylindrical frame, and the battery monomer 20 can be a cylindrical battery.

[0194] The first end wall 2113 and the side wall 2112 can be integrally formed. Alternatively, the first end wall 2113 and the side wall 2112 can be separate components connected together, for example, by welding or sealing. In an embodiment where the first end wall 2113 and the side wall 2112 are separate components connected together, the first end wall 2113 can be the end cap 212 of the battery cell 20.

[0195] The first end wall 2113 and the side wall 2112 can be directly connected. The first end wall 2113 and the side wall 2112 can also be indirectly connected, for example, through the first corner wall 2114. Figure 6 (As shown) Indirect connection.

[0196] The first insulating layer 25 may cover the entire outer surface of the first end wall 2113, or it may cover only a portion of the outer surface of the first end wall 2113. The outer surface of the first insulating layer 25 may be the surface of the first end wall 2113 facing away from the electrode assembly 22 along the first direction X.

[0197] Since at least a portion of the first insulating layer 25 of the first battery cell 20a is located between the adhesive layer 30 and the first end wall 2113 of the first battery cell 20a, the first end wall 2113 of the first battery cell 20a and the housing 10 are indirectly connected through the adhesive layer 30 and the first insulating layer 25. This makes it easier to connect the first battery cell 20a and the housing 10, and also helps to mitigate the impact of the setting of the adhesive layer 30 on the energy density of the battery device 100.

[0198] like Figure 5 , Figure 6 As shown, in some embodiments, the battery cell 20 further includes a second insulating layer 26, which covers the outer periphery of the sidewall 2112 and covers at least a portion of the outer surface of the sidewall 2112.

[0199] The outer surface of the side wall 2112 surrounds the outer periphery of the first end wall 2113.

[0200] The second insulating layer 26 may cover a portion of the outer surface of the sidewall 2112, for example, the second insulating layer 26 extends and closes along the circumference of the sidewall 2112, and in the first direction X, the second insulating layer 26 covers a portion of the sidewall 2112.

[0201] The second insulating layer 26 can also completely cover the outer surface of the sidewall 2112.

[0202] The second insulating layer 26 may be partially located on the sidewall 2112, or the second insulating layer 26 may be entirely located on the sidewall 2112.

[0203] The second insulation layer 26 can be attached to the surface of the side wall 2112 by spraying, electrophoresis, printing, etc. The connection mode of the second insulation layer 26 and the side wall 2112 can be the same as that of the first insulation layer 25 and the first end wall 2113, such as that the second insulation layer 26 and the side wall 2112 are directly bonded, or the second insulation layer 26 and the side wall 2112 are bonded through a glue layer.

[0204] In some embodiments, the shell 21 further comprises a second end wall 212', which is oppositely arranged to the first end wall 2113 along the first direction X, and the side wall 2112 is arranged around the outer periphery of the second end wall 212' and connected thereto. An opening 2111 can be formed at one end of the side wall 2112 away from the first end wall 2113, and the second end wall 212' can cover the opening 2111. The second insulation layer 26 can extend to the second end wall 212' and cover at least part of the outer surface of the second end wall 212'. This not only facilitates the assembly of the second insulation layer 26 on the shell 21, but also increases the coverage area of the second insulation layer 26, thereby increasing the area of the outer surface of the shell 21 covered by the insulation component, and providing better insulation protection for the battery monomer 20 and improving the reliability of the battery monomer 20.

[0205] In some embodiments, the second end wall 212' can be an end cover 212 of the battery monomer 20, and the electrode terminal 23 is arranged on the second end wall 212'. In this case, the first battery monomer 20a is connected to the box body 10 through the adhesive layer 30 at the side corresponding to the first end wall 2113, so that the electrode terminal 23 and the adhesive layer 30 are respectively located on the two sides of the first battery monomer 20a along the first direction X, thereby reducing the risk of interference between the adhesive layer 30 and the electrode terminal 23, and enabling the adhesive layer 30 to stably connect the first battery monomer 20a and the box body 10, and the electrode terminal 23 to provide conditions for stable and reliable charging and discharging of the battery monomer 20.

[0206] The connection mode of the second insulation layer 26 and the side wall 2112 can be different from that of the first insulation layer 25 and the first end wall 2113, such as that the second insulation layer 26 and the side wall 2112 are bonded through a glue layer, which is conducive to improving the connection stability between the second insulation layer 26 and the side wall 2112. In addition, the first insulation layer 25 and the first end wall 2113 are directly bonded, which can reduce the overall size of the battery monomer 20 after the first insulation layer 25 is arranged on the first end wall 2113, thereby facilitating the improvement of the energy density of the battery device 100.

[0207] Of course, the connection mode of the second insulation layer 26 and the side wall 2112 can be the same as that of the first insulation layer 25 and the first end wall 2113, such as that the second insulation layer 26 and the side wall 2112 are directly bonded, and the first insulation layer 25 and the first end wall 2113 are directly bonded.

[0208] The material of the second insulating layer 26 includes epoxy resin, acrylic resin, acrylic ink, polyimide, etc., and can also be a mixture of one or more of epoxy resin, acrylic resin, acrylic ink, and polyimide as a main component. The material of the second insulating layer 26 can be the same as or different from the material of the first insulating layer 25.

[0209] By further comprising the second insulating layer 26 covering at least part of the outer surface of the side wall 2112, the second insulating layer 26 can reduce moisture absorption of the battery monomer 20, reduce the corrosion effect of moisture on the battery monomer 20, and reduce the risk of contact between the battery monomer 20 and the external environment, thereby prolonging the service life of the battery monomer 20. It can also reduce the entry of pollutants into the interior of the battery monomer 20, such as dust, moisture, and other impurities affecting the performance of the battery monomer 20, reduce the risk of contact between the battery monomer 20 and other hard objects, thereby reducing the risk of damage or short circuit of the battery monomer 20 caused by external impact, improving the reliability of the battery monomer 20, and thereby improving the reliability of the battery device 100.

[0210] As shown in FIG. 1, Figure 6 In some embodiments, part of the first insulating layer 25 and part of the second insulating layer 26 overlap to form an overlapping area Q.

[0211] The overlapping of part of the first insulating layer 25 and part of the second insulating layer 26 means that one of the part of the first insulating layer 25 and the part of the second insulating layer 26 is connected to the surface of the other away from the shell 21. Among them, in the overlapping area Q, the first insulating layer 25 can be connected to the surface of the second insulating layer 26 away from the shell 21, or the second insulating layer 26 can be connected to the surface of the first insulating layer 25 away from the shell 21.

[0212] The overlapping area Q can extend along the circumference of the side wall 2112 and be closed, or the overlapping area Q can extend along the circumference of the side wall 2112 but not be closed.

[0213] By overlapping part of the first insulating layer 25 and part of the second insulating layer 26 to form the overlapping area Q, in the overlapping area Q, one of the first insulating layer 25 and the second insulating layer 26 overlaps the other, and the one away from the shell 21 can bind the one close to the shell 21, which is conducive to improving the connection stability of the first insulating layer 25 and the second insulating layer 26, and also conducive to reducing the process difficulty of arranging the first insulating layer 25 and the second insulating layer 26 on the surface of the shell 21 of the battery monomer 20.

[0214] As shown in FIG. 1, Figure 6As shown, in some embodiments, in the overlap region Q, the first insulating layer 25 is closer to the outer shell 21 than the second insulating layer 26, and the first insulating layer 25 connects the second insulating layer 26 and the outer shell 21.

[0215] In this embodiment, in the overlapping area Q, the second insulating layer 26 is connected to the surface of the first insulating layer 25 away from the outer shell 21, and the second insulating layer 26 and the outer shell 21 are connected through the first insulating layer 25.

[0216] Since the first insulating layer 25 of the first battery cell 20a is connected to the adhesive layer 30, in the overlap region Q, the first insulating layer 25 is closer to the outer shell 21 than the second insulating layer 26. The first insulating layer 25 connects the second insulating layer 26 and the outer shell 21. Therefore, in the overlap region Q, the second insulating layer 26 has a binding effect on the first insulating layer 25. When the battery device 100 is subjected to impact or is in a vibration condition, the connection stability between the first insulating layer 25 and the outer shell 21 is enhanced, and the risk of the first insulating layer 25 detaching from the outer shell 21 is reduced.

[0217] In some implementations, at least a portion of the overlapping region Q is located on the sidewall 2112.

[0218] Understandably, portions of the first insulating layer 25 and the second insulating layer 26 overlap on the sidewall 2112.

[0219] The overlapping region Q can be entirely located on the sidewall 2112, which reduces the area of ​​the overlapping region Q, thereby reducing the volume of the battery cell 20 and increasing the energy density of the battery device 100. Alternatively, the overlapping region Q can partially overlap on the sidewall 2112, resulting in a larger area of ​​the overlapping region Q, which is beneficial for improving the connection stability of the first insulating layer 25 and the second insulating layer 26. Figure 6 The diagram shows the case where part of the overlapping region Q is located on sidewall 2112. Figure 6 The diagram shows the case where the overlapping region Q is located on sidewall 2112. Figure 11 , Figure 12 The diagram shows the case where the entire overlapping region Q is located on sidewall 2112.

[0220] Since at least a portion of the overlapping area Q is located on the sidewall 2112, it is convenient to install the first insulating layer 25 and the structure of the processing equipment during the installation of the first insulating layer 25 is simpler.

[0221] like Figure 6 As shown, in some embodiments, the overlapping area Q includes a first region Q1 located on the sidewall 2112 along the first direction X, and the size of the first region Q1 is H1, 3mm≤H1≤20mm.

[0222] The first region Q1 can extend along the circumference of the side wall 2112 and be closed, i.e., the first region Q1 surrounds the outer circumference of the side wall 2112. In the first direction X, the size of the first region Q1 can be smaller than the size of the side wall 2112.

[0223] In the embodiment in which the overlap region Q is entirely located on the side wall 2112, the first region Q1 is the overlap region Q.

[0224] In the embodiment in which the overlap region Q is partially located on the side wall 2112, the first region Q1 is a part of the overlap region Q.

[0225] In the first direction X, one end of the first region Q1 closest to the first end wall 2113 can be flush with one end of the side wall 2112 closest to the first end wall 2113.

[0226] In the first direction X, one end of the first region Q1 closest to the first end wall 2113 can be farther away from the first end wall 2113 than one end of the side wall 2112 closest to the first end wall 2113 (as shown in FIG. 11). Figure 8

[0227] H1 can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0228] By the first region Q1 of the overlap region Q having a size greater than or equal to 3 mm in the first direction X, the first insulating layer 25 and the second insulating layer 26 have a large overlap area on the side wall 2112, so that the connection area of the first insulating layer 25 and the second insulating layer 26 is large, thereby improving the connection stability, and also reducing the risk of one of the first insulating layer 25 and the second insulating layer 26 being warped away from the side wall 2112, further improving the connection stability of the first insulating layer 25 and the first end wall 2113, the connection stability of the second insulating layer 26 and the side wall 2112, and the connection stability between the first insulating layer 25 and the second insulating layer 26. By the first region Q1 of the overlap region Q having a size less than or equal to 20 mm in the first direction X, the overlap area of the first insulating layer 25 and the second insulating layer 26 on the side wall 2112 is controlled within a reasonable range, which is conducive to reducing the volume of the battery monomer 20 and improving the energy density of the battery device 100. Therefore, 3 mm≤H1≤20 mm, which is conducive to both good connection stability of the first insulating layer 25 and the second insulating layer 26 and improvement of the energy density of the battery device 100.

[0229] In some embodiments, at least part of the overlap region Q is located on the first end wall 2113.

[0230] ​It can be understood that the part of the first insulating layer 25 and the part of the second insulating layer 26 overlap at the first end wall 2113.

[0231] The overlapping region Q can be entirely located at the first end wall 2113 or partially overlap the first end wall 2113. Figure 6 The case where the part of the overlapping region Q is located at the first end wall 2113 is shown in FIG. 11A. Figure 7 、 Figure 8 The case where the overlapping region Q is entirely located at the first end wall 2113 is shown in FIG. 11B.

[0232] By locating at least part of the overlapping region Q at the first end wall 2113, i.e., the part of the first insulating layer 25 and the part of the second insulating layer 26 overlap at the first end wall 2113, at the first end wall 2113, one of the first insulating layer 25 and the second insulating layer 26 overlaps the other, and the one away from the first end wall 2113 can bind the one close to the first end wall 2113, which is conducive to improving the connection stability of the first insulating layer 25 and the second insulating layer 26, and also conducive to reducing the process difficulty of arranging the first insulating layer 25 and the second insulating layer 26 on the surface of the shell 21 of the battery monomer 20.

[0233] As shown in FIG. 11C, in some embodiments, the overlapping region Q includes a second region Q2 located at the first end wall 2113, and the width of the second region Q2 is W1, W1≥1mm. Figure 6

[0234] The second region Q2 can extend along the circumference of the side wall 2112 and be closed, i.e., the second region Q2 is a circumferentially closed structure formed at the first end wall 2113. In any direction perpendicular to the first direction X, the size of the first region Q1 is smaller than the size of the first end wall 2113.

[0235] In the embodiment where the overlapping region Q is entirely located at the first end wall 2113, the second region Q2 is the overlapping region Q.

[0236] In the embodiment where the overlapping region Q is partially located at the first end wall 2113, the second region Q2 is part of the overlapping region Q.

[0237] In some embodiments, the edge of the second region Q2 closest to the side wall 2112 can be flush with the outer edge of the first end wall 2113. In other embodiments, the edge of the second region Q2 closest to the side wall 2112 can be farther away from the side wall 2112 than the edge of the first end wall 2113.

[0238] W1 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0239] ​The width of the second region Q2 of the overlap region Q is greater than or equal to 1 mm, so that the first insulating layer 25 and the second insulating layer 26 have a larger overlap region on the first end wall 2113, thereby increasing the connection area of the first insulating layer 25 and the second insulating layer 26, improving the connection stability, and also reducing the risk of warping of one of the first insulating layer 25 and the second insulating layer 26 away from the first end wall 2113, further improving the connection stability of the first insulating layer 25 and the first end wall 2113, the connection stability of the second insulating layer 26 and the side wall 2112, and the connection stability between the first insulating layer 25 and the second insulating layer 26.

[0240] Please continue to refer to Figure 6 In some embodiments, the shell 21 further comprises a first corner wall 2114 connecting the first end wall 2113 and the side wall 2112; the overlap region Q comprises a first region Q1 located on the side wall 2112, a second region Q2 located on the first end wall 2113, and a third region Q3 located on the first corner wall 2114, the third region Q3 connecting the first region Q1 and the second region Q2.

[0241] The first corner wall 2114 surrounds the outer periphery of the first end wall 2113, one end of the first corner wall 2114 is connected to the first end wall 2113, and the other end of the first corner wall 2114 is connected to the side wall 2112, thereby realizing the connection of the first corner wall 2114 to the first end wall 2113 and the side wall 2112, i.e. the indirect connection of the first end wall 2113 and the side wall 2112 through the first corner wall 2114.

[0242] The side wall 2112, the first end wall 2113 and the first corner wall 2114 can be integrally formed, i.e. the side wall 2112, the first end wall 2113 and the first corner wall 2114 together form an integrally formed shell 211. The side wall 2112, the first end wall 2113 and the first corner wall 2114 can be formed by an integral forming method such as stamping or casting.

[0243] The first corner wall 2114 is an arc-shaped wall, so that the first end wall 2113 and the side wall 2112 are connected through the first corner wall 2114, facilitating the molding of the shell 21.

[0244] In the present embodiment, along the first direction X, the size H1 of the first region Q1 on the side wall 2112 can be the distance from the connection position of the side wall 2112 and the first corner wall 2114 to the end of the first insulating layer 25 on the side wall 2112 away from the first end wall 2113. The width W1 of the second region Q2 on the first end wall 2113 is the distance from the connection position of the first end wall 2113 and the first corner wall 2114 to the end of the second insulating layer 26 on the first end wall 2113 away from the side wall 2112.

[0245] The overlapping area Q of the first insulating layer 25 and the second insulating layer 26 includes a first region Q1 located on the side wall 2112, a second region Q2 located on the first end wall 2113, and a third region Q3 located on the first corner wall 2114. The third region Q3 connects the first region Q1 and the second region Q2, resulting in a larger overlapping area of ​​the first insulating layer 25 and the second insulating layer 26. This increases the connection area of ​​the first insulating layer 25 and the second insulating layer 26, improves connection stability, and reduces the risk of the one of the first insulating layer 25 and the second insulating layer 26 away from the outer shell 21 lifting in the overlapping area Q. This further improves the connection stability between the first insulating layer 25 and the first end wall 2113, the connection stability between the second insulating layer 26 and the side wall 2112, and the connection stability between the first insulating layer 25 and the second insulating layer 26. It also further reduces the manufacturing difficulty of placing the first insulating layer 25 and the second insulating layer on the outer shell 21.

[0246] like Figure 6 As shown, in some embodiments, in a plane parallel to the first direction X, the length of the overlapping area Q extending along the outer surface of the outer shell 21 is L. Along the first direction X, the distance between the end of the first region Q1 away from the first end wall 2113 and the surface of the second region Q2 away from the first end wall 2113 is H. Along the thickness direction of the side wall 2112, the distance between the end of the second region Q2 away from the side wall 2112 and the surface of the first region Q1 away from the side wall 2112 is b. The overall dimension of the outer shell 21, the first insulating layer 25 and the second insulating layer 26 along the first direction X is U, where L-b+0.8mm≤H≤U-10mm.

[0247] L can be the shortest distance traveled from the end of the first region Q1 away from the first end wall 2113, passing through at least a portion of the outer surface of the side wall 2112, at least a portion of the outer surface of the first corner wall 2114, and at least a portion of the outer surface of the first end wall 2113 to reach the end of the second region Q2 away from the side wall 2112.

[0248] In an embodiment where the overlapping area Q is a structure that extends circumferentially along the sidewall 2112 and is closed, L can be the length of one of the lines of intersection generated by the surface of the overlapping area Q facing the outer shell 21 and a plane parallel to the first direction X, passing through the sidewall 2112, the first corner wall 2114 and the first end wall 2113.

[0249] The dimension U of the outer casing 21, the first insulating layer 25 and the second insulating layer 26 along the first direction X refers to the dimension of the structure of the outer casing 21, the first insulating layer 25 and the second insulating layer 26 as a whole in the first direction X when the battery cell 20 is assembled.

[0250] The size of U is different according to different setting modes of the first insulating layer 25 and the second insulating layer 26. The shell 21 comprises a second end wall 212', which is oppositely arranged with the first end wall 2113 along the first direction X, and the side wall 2112 surrounds the outer periphery of the second end wall 212' and is connected with the second end wall 212'. Exemplarily, in some embodiments, the part of the first insulating layer 25 and the part of the second insulating layer 26 overlap to form an overlapping second region Q2 at the first end wall 2113, the second insulating layer 26 does not extend to the second end wall 212', and U is the distance between the surface of the second region Q2 away from the first end wall 2113 and the outer surface of the second end wall 212' in the first direction X.

[0251] In other embodiments, the part of the first insulating layer 25 and the part of the second insulating layer 26 overlap to form an overlapping second region Q2 at the first end wall 2113, the second insulating layer 26 extends to the second end wall 212' and covers at least part of the outer surface of the second end wall 212', and U is the distance between the surface of the second region Q2 away from the first end wall 2113 and the surface of the part of the second insulating layer 26 covering the second end wall 212' away from the second end wall 212' in the first direction X.

[0252] By H≥L-b+0.8mm, the risk of creeping phenomenon is reduced, thereby reducing the risk of short circuit of the battery monomer 20, improving the reliability of the battery monomer 20, and further improving the reliability of the battery device 100. H≤U-10mm controls the overlapping region (the first region Q1) of the first insulating layer 25 and the second insulating layer 26 at the side wall 2112 within a reasonable range, which is conducive to reducing the volume of the battery monomer 20 and improving the energy density of the battery device 100. Therefore, L-b+0.8mm≤H≤U-10mm can make the battery device 100 have better reliability and higher energy density.

[0253] As shown in FIG. 1, Figure 6 In some embodiment groups, the first insulating layer 25 comprises a first part 251 which does not overlap with the second insulating layer 26, and the bonding layer 30 connects the box body 10 and the first part 251 of the first battery monomer 20a.

[0254] Specifically, at the first end wall 2113, the first insulating layer 25 has a first part 251 which does not overlap with the second insulating layer 26, and the first part 251 of the first insulating layer 25 is connected with the bonding layer 30.

[0255] In embodiments in which the first insulating layer 25 and the second insulating layer 26 do not form an overlapping region Q at the first end wall 2113, the part of the first insulating layer 25 connected to the first end wall 2113 can all be the first part 251.

[0256] In the embodiment in which the first insulating layer 25 and the second insulating layer 26 form the overlapping second region Q2 at the first end wall 2113, the first portion 251 is a part of a region of the portion of the first insulating layer 25 connected to the first end wall 2113.

[0257] By connecting the case 10 and the first portion 251 of the first battery cell 20a through the adhesive layer 30, the space occupied by the first battery cell 20a and the adhesive layer 30 in the stacking direction of the first insulating layer 25 and the adhesive layer 30 can be reduced, thereby reducing the size of the battery device 100 in the stacking direction of the first insulating layer 25 and the adhesive layer 30, which is conducive to improving the energy density of the battery device 100.

[0258] As shown in FIG. 1, Figures 7-10 in some embodiments, the first insulating layer 25 does not overlap the side wall 2112 in the projection plane perpendicular to the thickness direction of the side wall 2112.

[0259] Since the side wall 2112 is a closed structure along the circumference of the first end wall 2113, the thickness direction of the side wall 2112 at different positions along the circumference of the first end wall 2113 is different. In the projection plane perpendicular to the thickness direction of the side wall 2112, the first insulating layer 25 does not overlap the side wall 2112 in the projection plane perpendicular to the thickness direction of the side wall 2112. Understandably, in any projection plane perpendicular to the thickness direction of the side wall 2112, the first insulating layer 25 does not overlap the side wall 2112 in the projection plane perpendicular to the thickness direction of the side wall 2112, i.e., the first insulating layer 25 does not extend to the side wall 2112.

[0260] In the projection plane perpendicular to the thickness direction of the side wall 2112, the first insulating layer 25 does not overlap the side wall 2112 in the projection plane perpendicular to the thickness direction of the side wall 2112, i.e., the first insulating layer 25 does not extend to the side wall 2112, which can reduce the space occupied by the first insulating layer 25 and the area of the overlapping region Q of the first insulating layer 25 and the second insulating layer 26, thereby facilitating the reduction of the volume of the battery cell 20 and further improving the energy density of the battery device 100.

[0261] In the embodiment in which the first insulating layer 25 does not extend to the side wall 2112, as shown in FIG. 1, Figure 7 Figure 8 In the embodiment in which the first insulating layer 25 does not extend to the side wall 2112, as shown in FIG. 1,

[0262] By locating the first insulating layer 25 entirely on the first end wall 2113, the first insulating layer 25 does not extend to the side wall 2112, which can reduce the space occupied by the first insulating layer 25 and the area of the overlapping region Q of the first insulating layer 25 and the second insulating layer 26, thereby facilitating the reduction of the volume of the battery cell 20 and further improving the energy density of the battery device 100.​

[0263] Of course, in other embodiments, as shown in FIGS. 1A and 1B, the first insulating layer 25 can be partially located on the first end wall 2113 and partially extend to the first corner wall 2114, so that the first insulating layer 25 has a larger coverage area, which not only facilitates the arrangement of the first insulating layer 25 on the shell 21, but also increases the area of the surface insulating component of the shell 21 and improves the reliability of the battery monomer 20. Figure 9 、 Figure 10

[0264] In the embodiment in which the first insulating layer 25 is completely located on the first end wall 2113, in the projection plane perpendicular to the first direction X, the area of the orthographic projection of the first end wall 2113 is S1, and the area of the orthographic projection of the first insulating layer 25 is S2, and 0.5≤S2 / S1≤1.

[0265] S2 / S1 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0266] By 0.5≤S2 / S1, the first insulating layer 25 has sufficient area, which facilitates the connection of the first insulating layer 25 and the adhesive layer 30, and enables the first insulating layer 25 to better insulate and protect the first end wall 2113, so that the battery monomer 20 has better reliability. S2 / S1≤1 makes the first insulating layer 25 completely located on the first end wall 2113, which can reduce the space occupied by the first insulating layer 25 and the area of the overlapping region Q of the first insulating layer 25 and the second insulating layer 26, which is beneficial to reducing the volume of the battery monomer 20 and improving the energy density of the battery device 100. Therefore, 0.5≤S2 / S1≤1 makes the battery device 100 have better reliability and energy density.

[0267] As shown in FIGS. 1A and 1B, in some embodiments, the shell 21 further includes a first corner wall 2114, and an outer surface of the first corner wall 2114 is connected to an outer surface of the side wall 2112 and an outer surface of the first end wall 2113; and a portion of the first insulating layer 25 covers at least a portion of the first corner wall 2114. Figure 9 、 Figure 10

[0268] That is, a portion of the first insulating layer 25 covers the entire first end wall 2113, and another portion of the first insulating layer 25 covers at least a portion of the first corner wall 2114. The first insulating layer 25 can cover a portion of the first corner wall 2114 or the entire first corner wall 2114.

[0269] ​​In an embodiment where the first insulating layer 25 covers a portion of the first corner wall 2114, the first insulating layer 25 may cover a portion of the first corner wall 2114 in any direction. For example, the portion of the first insulating layer 25 located in the first corner wall 2114 may extend circumferentially along the first end wall 2113 and be closed, and the portion of the first insulating layer 25 located in the first corner wall 2114 may cover a portion of the first corner wall 2114 along the first direction X.

[0270] By partially covering at least a portion of the first corner wall 2114 with the first insulating layer 25, the first insulating layer 25 covers both the first end wall 2113 and the first corner wall 2114, resulting in a larger coverage area of ​​the first insulating layer 25. This provides better insulation and protection for the battery cell 20, improves the reliability of the battery cell 20, and thus improves the reliability of the battery device 100.

[0271] In some embodiments, in the projection plane perpendicular to the first direction X, the area of ​​the orthographic projection of the first end wall 2113 is S1, the area of ​​the orthographic projection of the first insulating layer 25 is S2, and 1 < S2 / S1 ≤ 1.2.

[0272] For example, S2 / S1 can be 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, etc.

[0273] By setting 1 < S2 / S1, the first insulating layer 25 covers both the first end wall 2113 and the first corner wall 2114, resulting in a larger coverage area. This provides better insulation and protection for the battery cell 20, improving its reliability and consequently, the reliability of the battery device 100. By setting S2 / S1 ≤ 1.2, the coverage area of ​​the first insulating layer 25 is controlled within a reasonable range, reducing its space occupation and thus decreasing the volume of the battery cell 20, thereby increasing the energy density of the battery device 100. Therefore, setting 1 < S2 / S1 ≤ 1.2 ensures that the battery device 100 possesses both good reliability and energy density.

[0274] like Figure 11 , Figure 12 As shown, in some embodiments, the second insulating layer 26 does not extend to the first end wall 2113.

[0275] The second insulating layer 26 may extend to the first corner wall 2114 and / or the second end wall 212'.

[0276] The second insulating layer 26 does not extend to the first end wall 2113, which can reduce the space occupied by the second insulating layer 26, reduce the area of the overlapping region Q of the first insulating layer 25 and the second insulating layer 26, and help reduce the volume of the battery monomer 20 and improve the energy density of the battery device 100.

[0277] In some embodiments, the connection strength of the first insulating layer 25 and the first end wall 2113 is greater than the connection strength of the second insulating layer 26 and the side wall 2112.

[0278] The connection strength of the first insulating layer 25 and the first end wall 2113 can be the connection strength of the first insulating layer 25 and the shell 21.

[0279] According to different connection modes of the second insulating layer 26 and the side wall 2112, the connection strength between the second insulating layer 26 and the side wall 2112 is different. For example, the second insulating layer 26 and the side wall 2112 are directly bonded, and the connection strength between the second insulating layer 26 and the side wall 2112 can be the bonding strength between the second insulating layer 26 and the side wall 2112. For another example, the second insulating layer 26 and the side wall 2112 are indirectly bonded through a glue layer, and the connection strength between the second insulating layer 26 and the side wall 2112 can be the bonding strength between the glue layer and the second insulating layer 26, the interlayer bonding strength of the glue layer, or the bonding strength between the glue layer and the side wall 2112. For another example, the second insulating layer 26 and the side wall 2112 are connected through other connection structures (such as bolts), and the connection strength between the second insulating layer 26 and the side wall 2112 can be the fracture strength of the connection structure (such as the bolt).

[0280] Since the adhesive layer 30 connects the first insulating layer 25 and the box body 10, and the connection strength of the first insulating layer 25 and the first end wall 2113 is greater than the connection strength of the second insulating layer 26 and the side wall 2112, when the battery device 100 is subjected to impact or is in a vibration working condition, the first insulating layer 25 is not easy to separate from the first end wall 2113 under the pulling of the adhesive layer 30, so that the first insulating layer 25 can always insulate and protect the first battery monomer 20a, and the reliability of the battery monomer 20 is improved.

[0281] In some embodiments, the first insulating layer 25 is an insulating coating, and the second insulating layer 26 is an insulating film.

[0282] That is, the first insulating layer 25 can be a structure formed by spraying, electrophoresis, printing or the like on the surface of the shell 21. The second insulating layer 26 can be a film, such as a Mylar film.

[0283] The first insulating layer 25 is an insulating coating, so that the connection strength between the first insulating layer 25 and the shell 21 is better. The second insulating layer 26 is an insulating film, so that it is more convenient to arrange the second insulating layer 26 on the shell 21.

[0284] In some embodiments, the connection strength of the first insulating layer 25 and the first end wall 2113 is 5-15 MPa.

[0285] For example, the connection strength of the first insulating layer 25 and the first end wall 2113 can be 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa, 11 MPa, 12 MPa, 13 MPa, 14 MPa, 15 MPa, etc.

[0286] By making the connection strength of the first insulating layer 25 and the first end wall 2113 greater than or equal to 5 MPa, the connection stability between the first insulating layer 25 and the first end wall 2113 is good, and the first insulating layer 25 is not easy to separate from the first end wall 2113. By making the connection strength of the first insulating layer 25 and the first end wall 2113 less than or equal to 15 MPa, the connection strength between the first insulating layer 25 and the first end wall 2113 is not too large, thereby facilitating the reduction of process difficulty and the control of the production cost of the battery monomer 20. Therefore, the connection strength of the first insulating layer 25 and the first end wall 2113 is 5-15 MPa, so that the first insulating layer 25 is not easy to separate from the first end wall 2113, and the production process difficulty of the battery monomer 20 and the production cost of the battery monomer 20 can be further reduced.

[0287] Further, the connection strength of the first insulating layer 25 and the first end wall 2113 is 7-11 MPa.

[0288] For example, the connection strength of the first insulating layer 25 and the first end wall 2113 can be 7 MPa, 7.1 MPa, 7.2 MPa, 7.5 MPa, 7.6 MPa, 7.8 MPa, 8.2 MPa, 8.5 MPa, 8.8 MPa, 9.2 MPa, 9.5 MPa, 10.5 MPa, 11 MPa, etc.

[0289] By making the connection strength of the first insulating layer 25 and the first end wall 2113 greater than or equal to 7 MPa, the connection stability between the first insulating layer 25 and the first end wall 2113 is better, and the first insulating layer 25 is not easy to separate from the first end wall 2113. By making the connection strength of the first insulating layer 25 and the first end wall 2113 less than or equal to 11 MPa, the connection strength between the first insulating layer 25 and the first end wall 2113 is not too large, thereby facilitating the further reduction of process difficulty and the control of the production cost of the battery monomer 20. Therefore, the connection strength of the first insulating layer 25 and the first end wall 2113 is 7-11 MPa, so that the first insulating layer 25 is not easy to separate from the first end wall 2113, and the production process difficulty of the battery monomer 20 and the production cost of the battery monomer 20 can be further reduced.

[0290] For example, the connection strength of the first insulating layer 25 and the first end wall 2113 can be 7 MPa, 7.1 MPa, 7.2 MPa, 7.5 MPa, 7.6 MPa, 7.8 MPa, 8.2 MPa, 8.5 MPa, 8.8 MPa, 9.2 MPa, 9.5 MPa, 10.5 MPa, 11 MPa, etc. Figures 13-18As shown, in some embodiments, the battery device 100 further comprises a thermal management component 40 for managing the temperature of the battery cells 20; a portion of the first insulating layer 25 and a portion of the second insulating layer 26 overlap, forming an overlapping region Q, the overlapping region Q comprises a first region Q1 located at the side wall 2112; the plurality of battery cells 20 are arranged along a second direction Y, along the second direction Y, a thermal management component 40 is arranged between any two adjacent battery cells 20, the second insulating layer 26 comprises a second portion 261 which does not overlap with the first insulating layer 25, the thermal management component 40 directly or indirectly abuts against the second portion 261, the first region Q1 and the thermal management component 40 are not in contact, and the first direction X intersects the second direction Y.

[0291] The thermal management component 40 can increase or decrease the temperature of the battery cells 20, thereby achieving the management of the temperature of the battery cells 20. The thermal management component 40 can be a water-cooled plate, a heat plate, etc.

[0292] The second portion 261 of the second insulating layer 26 is located at the side wall 2112.

[0293] At least a part of the thermal management component 40 can directly abut against the second portion 261. At least a part of the thermal management component 40 can also indirectly abut against the second portion 261, for example, a buffer foam is arranged between the thermal management component 40 and the second portion 261, thereby achieving the indirect abutment of the thermal management component 40 and the second portion 261.

[0294] The first direction X and the second direction Y can be perpendicular to each other.

[0295] The first region Q1 and the thermal management component 40 are not in contact, which can be that along the second direction Y, the first region Q1 and the thermal management component 40 have a gap M in the second direction Y, or a buffer structure (such as a buffer foam) is arranged between the first region Q1 and the thermal management component 40 to make the first region Q1 and the thermal management component 40 not in contact, or as viewed along the second direction Y, the first region Q1 and the thermal management component 40 do not overlap.

[0296] The battery device 100 further comprises a thermal management component 40. The thermal management component 40 is configured to manage the temperature of the battery cell 20, so that the temperature of the battery cell 20 can be within a normal range, to meet the temperature requirement for the battery cell 20 to be normally fully charged and to improve the reliability of the battery cell 20, thereby improving the reliability of the battery device 100. The thermal management component 40 directly or indirectly abuts against the second portion 261, so that the thermal management component 40 can manage the temperature of the battery cell 20 and improve the heat exchange efficiency. The first region Q1 and the thermal management component 40 are not in contact, which reduces the risk of interference between the first region Q1 and the thermal management component 40, so that the thermal management component 40 can stably abut against the second portion 261, and the thermal management component 40 can effectively adjust the temperature of the battery cell 20.

[0297] As shown in FIG. 1, in some embodiments, the first region Q1 and the thermal management component 40 have a gap M in the second direction Y. Figures 13-16

[0298] In the present embodiment, at least part of the first region Q1 and part of the thermal management component 40 overlap in the second direction Y, and the first region Q1 and the thermal management component 40 have a gap M.

[0299] The gap M between the first region Q1 and the thermal management component 40 can provide space for the battery cell 20 to expand, which reduces the risk of interference between the second region Q2 and the thermal management component 40 after the battery cell 20 expands, so that the thermal management component 40 can stably abut against the second portion 261, and the thermal management component 40 can effectively adjust the temperature of the battery cell 20.

[0300] As shown in FIG. 1, in some embodiments, the battery device 100 further comprises a thermal management component 40, and the thermal management component 40 is configured to manage the temperature of the battery cell 20; part of the first insulating layer 25 and part of the second insulating layer 26 overlap to form an overlapping region Q, and the overlapping region Q comprises the first region Q1 located on the side wall 2112; the plurality of battery cells 20 are arranged in the second direction Y, and the thermal management component 40 is arranged between two adjacent battery cells 20 in the second direction Y, and the thermal management component 40 has an avoiding portion P configured to avoid the first region Q1. Figures 13-18 The avoiding portion P avoids the first region Q1, and the avoiding portion P makes the first region Q1 and the thermal management component 40 not in contact or can alleviate the degree of extrusion between the first region Q1 and the thermal management component 40. For example, the avoiding portion P is a gap M between the first region Q1 and the thermal management component 40 in the second direction Y, or the thermal management component 40 and the first region Q1 do not overlap in the second direction Y, so that the thermal management component 40 avoids the first region Q1.

[0301]

[0302] ​​The battery device 100 further comprises a thermal management component 40, through which the temperature of the battery cell 20 is managed so that the temperature of the battery cell 20 can be in a normal range to meet the temperature requirement for normal full charging of the battery cell 20 and improve the reliability of the battery cell 20. The thermal management component 40 has a clearance P that can clear the first region Q1, reducing the risk of interference between the first region Q1 and the thermal management component 40, so that the thermal management component 40 can stably directly or indirectly abut against other regions of the battery cell 20, so that the thermal management component 40 can effectively adjust the temperature of the battery cell 20.

[0303] As shown in some embodiments, along the first direction X, the thermal management component 40 comprises a first segment 41 and a second segment 42 connected in sequence, the first segment 41 is closer to the first region Q1 than the second segment 42, the thickness of the first segment 41 is smaller than the thickness of the first segment 41, and the side of the first segment 41 facing the first region Q1 forms the clearance P. Figures 13-16

[0304] As viewed along the second direction Y, at least part of the second segment 42 overlaps the second part 261 of the second insulating layer 26, and at least part of the first segment 41 overlaps the first region Q1.

[0305] The thickness of the first segment 41 refers to the dimension of the first segment 41 along the second direction Y. The thickness of the second segment 42 refers to the dimension of the second segment 42 along the second direction Y. Along the second direction Y, the second segment 42 protrudes from the opposite two surfaces of the first segment 41, so that the surface of the first segment 41 facing the first region Q1 is farther away from the shell 21 than the surface of the second segment 42 facing the first part 251, so that the surface of the first segment 41 facing the second region Q2 and the second region Q2 are formed with a gap M in the second direction Y, which is the clearance P.

[0306] The gap M can be a gap M with equal intervals along the first direction X. The gap M can also be a gap M with variable intervals along the first direction X. Figure 14 The case where the gap M has equal intervals is shown in the figure.

[0307] By setting the thickness of the first segment 41 of the thermal management component 40 opposite the first region Q1 to be small, thereby forming the clearance P on the side of the first segment 41 facing the first region Q1, not only reduces the risk of interference between the thermal management component 40 and the first region Q1, but also makes the thermal management component 40 have a larger size in the first direction X, thereby making the outer surface area of the thermal management component 40 larger, making the thermal management component 40 have a larger heat exchange area, thereby improving the adjustment efficiency of the temperature in the box 10.

[0308] As shown in some embodiments, along the first direction X, the thermal management component 40 comprises a first segment 41 and a second segment 42 connected in sequence, the first segment 41 is closer to the first region Q1 than the second segment 42, the thickness of the first segment 41 is smaller than the thickness of the first segment 41, and the side of the first segment 41 facing the first region Q1 forms the clearance P. Figure 15 , Figure 16 ​As shown, in some embodiments, the thickness of the thermal management component 40 gradually decreases from the middle to both ends along the first direction X, so as to form a clearance portion P on the side of the thermal management component 40 facing the first region Q1.

[0309] In this embodiment, along the second direction Y, the two opposing surfaces of the thermal management component 40 are both arc surfaces. The two arc surfaces gradually approach each other from the middle to both ends along the first direction X, thereby causing the thickness of the thermal management component 40 to gradually decrease from the middle to both ends along the first direction X.

[0310] When viewed along the second direction Y, the thermal management component 40 and the first region Q1 may or may not overlap.

[0311] In an embodiment where the thermal management component 40 and the first region Q1 overlap when viewed along the second direction Y, the distance between the thermal management component 40 and the first region Q1 gradually increases from the direction from the second part 261 to the first region Q1, thereby forming a gradually changing gap M between the thermal management component 40 and the first region Q1, which is the clearance part P.

[0312] By gradually decreasing the thickness of the thermal management component 40 from the middle to both ends along the first direction X, the thickness of the area of ​​the thermal management component 40 opposite to the first region Q1 is smaller. This forms a clearance portion P on the side of the thermal management component 40 facing the first region Q1, which reduces the risk of interference between the thermal management component 40 and the first region Q1. It also makes the outer surface area of ​​the thermal management component 40 larger, giving it a larger heat exchange area and thus improving the efficiency of temperature regulation inside the housing 10.

[0313] like Figures 17-18 As shown, in some embodiments, the battery device 100 further includes a thermal management component 40 for managing the temperature of the battery cell 20; a portion of the first insulating layer 25 and a portion of the second insulating layer 26 overlap to form an overlapping region Q, the overlapping region Q including a first region Q1 located on the sidewall 2112; a plurality of battery cells 20 are arranged along a second direction Y, and a thermal management component 40 is disposed between two adjacent battery cells 20 along the second direction Y, the projection of the thermal management component 40 and the first region Q1 do not overlap, and the second direction Y intersects the first direction X.

[0314] If the projection of the thermal management component 40 does not overlap with that of the first region Q1 when viewed along the second direction Y, then the thermal management component 40 is set to completely avoid the first region Q1.

[0315] The thermal management component 40 does not overlap with the projection of the first region Q1, reducing the risk of interference between the first region Q1 and the thermal management component 40, so that the thermal management component 40 can stably abut against the region other than the first region Q1 of the battery monomer 20, so that the thermal management component 40 can effectively adjust the temperature of the battery monomer 20, and can also provide space for the expansion of the battery monomer 20. After the expansion of the battery monomer 20, the second region Q2 and the thermal management component 40 will not interfere, so that the thermal management component 40 can stably abut against the region other than the first region Q1 of the battery monomer 20, so that the thermal management component 40 can effectively adjust the temperature of the battery monomer 20.

[0316] As shown in Figure 6 , Figure 8 , Figure 10 , Figure 12 In some embodiments, the outer surface of the first end wall 2113 has a fourth region 21131 which is not covered by the second insulating layer 26. In the projection plane perpendicular to the first direction X, the area of the orthographic projection of the fourth region 21131 is greater than the area of the orthographic projection of the adhesive layer 30.

[0317] In embodiments in which the second insulating layer 26 does not extend to the first end wall 2113, the outer surface of the first end wall 2113 is the fourth region 21131. In embodiments in which the second insulating layer 26 extends to the first end wall 2113, the fourth region 21131 is a part of the outer surface of the first end wall 2113.

[0318] In the projection plane perpendicular to the first direction X, the area of the orthographic projection of the fourth region 21131 is greater than the area of the orthographic projection of the adhesive layer 30, reducing the risk of overflow during the bonding of the box body 10 and the first battery monomer 20a, improving the quality of the battery device 100 and improving customer satisfaction.

[0319] As shown in Figure 6 , Figure 8 , Figure 10 , Figure 12 In some embodiments, the shell 21 comprises a shell body 211 and an end cover 212. The shell body 211 has an opening 2111, and the end cover 212 closes the opening 2111. The shell body 211 comprises a first end wall 2113 and a side wall 2112, and the first end wall 2113 is arranged opposite to the end cover 212.

[0320] The end cover 212 can be the aforementioned second end wall 212'. The electrode terminal 23 is arranged on the end cover 212. The end cover 212 can further be provided with a pressure relief component 27 (such as an explosion-proof valve), a liquid injection hole 28, and the like.

[0321] The first end wall 2113 is opposite to the end cover 212, the first insulation layer 25 covers the first end wall 2113, and the adhesive layer 30 connects the first insulation layer 25 and the box body 10, thereby reducing the risk of structural interference on the adhesive layer 30 and the end cover 212 and improving the reliability of the battery device 100.

[0322] As shown in Figure 4 some embodiments, the end cover 212 supports the electrode assembly 22. That is, the end cover 212 is below the electrode assembly 22, the electrode assembly 22 is directly or indirectly placed on the end cover 212, and the end cover 212 bears the gravity of the electrode assembly 22.

[0323] Since the end cover 212 supports the electrode assembly 22, the first end wall 2113 is above the battery cell 20, thereby facilitating the connection of the first battery cell 20a and the box body 10.

[0324] Please continue to refer to Figure 4 In some embodiments, the box body 10 includes a connecting portion 13 opposite to the first end wall 2113 along the first direction X, and the adhesive layer 30 connects the first insulation layer 25 and the connecting portion 13.

[0325] The connecting portion 13 can be a part of the box wall of the box body 10. As shown in Figure 4 the connecting portion 13 is a part of the first box body 11, the connecting portion 13, the adhesive layer 30, and the first end wall 2113 are stacked along the first direction X, and along the first direction X, the adhesive layer 30 is connected between the first end wall 2113 and the connecting portion 13.

[0326] The connecting portion 13 can also be a structure arranged in the box body 10, such as the connecting portion 13 being fixedly connected in the box body 10 or being detachably connected in the box body 10.

[0327] The first end wall 2113 and the connecting portion 13 are opposite to each other along the first direction X, the first insulation layer 25 covers the first end wall 2113, at least part of the first insulation layer 25 and the connecting portion 13 are opposite to each other along the first direction X, and the adhesive layer 30 connects the first insulation layer 25 and the connecting portion 13, so that the connection is more convenient, the distance between the first insulation layer 25 and the connecting portion 13 is shorter, which is conducive to reducing the size of the adhesive layer 30 along the first direction X, thereby being conducive to reducing the space occupied by the adhesive layer 30, and further being conducive to improving the energy density of the battery device 100.

[0328] As shown in Figure 6 , Figure 8 , Figure 10 , Figure 12 In some embodiments, the thickness of the first insulation layer 25 is T, and 60 μm≤T≤240 μm.

[0329] Exemplarily, the thickness T of the first insulation layer 25 can be 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, or the like.

[0330] By the thickness of the first insulation layer 25 being greater than or equal to 60 μm, the first insulation layer 25 has better insulation protection performance, improving the reliability of the battery monomer 20, and further improving the reliability of the battery device 100. By the thickness of the first insulation layer 25 being less than or equal to 240 μm, the space occupied by the first insulation layer 25 is reduced, which is conducive to improving the energy density of the battery device 100. Therefore, 60 μm≤T≤240 μm, so that the battery device 100 has better reliability and energy density.

[0331] In some embodiments, the interlayer bonding strength of the bonding layer 30 is less than the bonding strength of the bonding layer 30 and the box 10.

[0332] By the interlayer bonding strength of the bonding layer 30 being less than the bonding strength of the bonding layer 30 and the box 10, when the battery device 100 is subjected to impact or is in a vibration working condition, the bonding relationship between the bonding layer 30 and the box 10 fails before the bonding layer 30 breaks from the interlayer of the bonding layer 30. Then, a part of the bonding layer 30 can still be bonded to the first battery monomer 20a. In the case that there is no insulation layer in the area of the battery monomer 20 connected with the bonding layer 30, the part of the bonding layer 30 bonded to the outer shell 21 of the battery monomer 20 can protect the battery monomer 20, such as insulating protection, reducing the risk of short circuit, overcharge, overdischarge, and the like between the battery monomer 20 and other components. For example, reducing the contact between the outer shell 21 of the battery monomer 20 and the external environment, reducing the risk of pollution and corrosion, improving the reliability of the battery monomer 20, and thus improving the reliability of the battery device 100. In the case that the surface of the battery monomer 20 connected with the bonding layer 30 is an insulation layer, the part of the bonding layer 30 bonded to the surface of the insulation layer and the insulation layer can jointly protect the battery monomer 20. In the case that the connection area of the battery monomer 20 and the bonding layer 30 has two layers of insulation protection, the insulation layer and the bonding layer 30, the reliability of the battery monomer 20 is improved. The other part of the bonding layer 30 is bonded to the box 10, so that the corresponding area of the box 10 still has insulation performance, which can play a role in insulation protection between the box 10 and the battery monomer 20, thereby making the battery device 100 have better reliability.

[0333] The embodiments of the present application also provide a power consumption device, which comprises the battery device 100 provided by any of the above embodiments.

[0334] The battery device 100 provided by any of the above embodiments has good reliability, and is beneficial to improving the power utilization reliability of a power utilization device powered by the battery device 100.

[0335] The battery device 100 provided by any of the above embodiments has good reliability, and is beneficial to improving the power utilization reliability of a power utilization device powered by the battery device 100.

[0336] The first insulation layer 25 and the second insulation layer 26 partially overlap to form an overlapping area Q, and the overlapping area Q includes a first area Q1 on the side wall 2112. The plurality of battery monomers 20 are arranged along a second direction Y, and the battery device 100 further includes a thermal management component 40, and the thermal management component 40 is arranged between two adjacent battery monomers 20 along the second direction Y. Along the first direction X, the thermal management component 40 includes a first segment 41 and a second segment 42 connected to each other, the first segment 41 is closer to the first area Q1 than the second segment 42, the thickness of the first segment 41 is smaller than the thickness of the second segment 42, and the side of the first segment 41 facing the first area Q1 forms a avoiding part P avoiding the first area Q1. Alternatively, the thickness of the thermal management component 40 gradually decreases from the middle of the thermal management component 40 along the first direction X to both ends, so as to form the avoiding part P avoiding the first area Q1 on the side of the thermal management component 40 facing the first area Q1, or along the second direction Y, the projection of the thermal management component 40 and the first area Q1 do not overlap.

[0337] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0338] The above examples are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized by, The battery includes: a case; a plurality of battery cells accommodated in the case, the plurality of battery cells including at least one first battery cell; an adhesive layer connecting the case and the first battery cell; wherein an interlayer adhesive strength of the adhesive layer is less than an adhesive strength of the adhesive layer and the first battery cell. The battery cell includes a housing, an electrode assembly accommodated in the housing, and a first insulating layer connected to the housing and covering at least part of an outer surface of the housing; 2. The battery device of claim 1, wherein the adhesive layer connects the first insulating layer of the first battery cell and the case, and an interlayer adhesive strength of the adhesive layer is less than an adhesive strength of the adhesive layer and the first insulating layer of the first battery cell. The interlayer adhesive strength of the adhesive layer is less than a connection strength of the first insulating layer of the first battery cell and the housing.

3. The battery device of claim 2, wherein The housing includes a first end wall and a side wall surrounding an outer periphery of the first end wall and connected to the first end wall, the first end wall being located at one end of the side wall in a first direction; 4. The battery device of claim 2, wherein In the first direction, at least part of the first insulating layer of the first battery cell is located between the adhesive layer and the first end wall of the first battery cell and covers at least part of an outer surface of the first end wall. The battery cell further includes a second insulating layer covering an outer periphery of the side wall and covering at least part of an outer surface of the side wall.

5. The battery device of claim 4, wherein Part of the first insulating layer and part of the second insulating layer overlap to form an overlapping region.

6. The battery device of claim 5, wherein In the overlapping region, the first insulating layer is closer to the housing than the second insulating layer, and the first insulating layer connects the second insulating layer and the housing.

7. The battery device of claim 6, wherein At least part of the overlapping region is located in the side wall.

8. The battery device of claim 6, wherein The overlapping region includes a first area located in the side wall, and in the first direction, the size of the first area is H1, 3mm≤H1≤20mm.

9. The battery device of claim 8, wherein At least part of the overlapping region is located in the first end wall.

10. The battery device of claim 6, wherein The overlapping region includes a second area located in the first end wall, and the width of the second area is W1, W1≥1mm.

11. The battery device of claim 10, wherein, The housing further includes a first corner wall connecting the first end wall and the side wall; 12. The battery device of any one of claims 6-11, wherein, The overlapping region includes a first area located in the side wall, a second area located in the first end wall, and a third area located in the first corner wall, and the third area connects the first area and the second area. In a plane parallel to the first direction, the length of the overlapping region along the extension of the outer surface of the housing is L, in the first direction, the distance between one end of the first area away from the first end wall and the surface of the second area away from the first end wall is H, in the thickness direction of the side wall, the distance between one end of the second area away from the side wall and the surface of the first area away from the side wall is b, the size of the housing, the first insulating layer and the second insulating layer in the first direction is U, L-b+0.8mm≤H≤U-10mm.

13. The battery device of claim 12, wherein, ​ 14. The battery device of any one of claims 5-11, wherein, The first insulating layer includes a first portion that does not overlap the second insulating layer, and the adhesive layer connects the case and the first portion of the first battery cell.

15. The battery device of any one of claims 5-6, wherein, In a projection plane perpendicular to a thickness direction of the side wall, a footprint of the first insulating layer does not overlap a footprint of the side wall.

16. The battery device of claim 15, wherein, The first insulating layer is entirely located at the first end wall.

17. The battery device of claim 16, wherein, In a projection plane perpendicular to the first direction, an area of a footprint of the first end wall is S1, and an area of a footprint of the first insulating layer is S2, and 0.5≤S2 / S1≤1.

18. The battery device of claim 5 or 6, wherein The housing further includes a first corner wall, an outer surface of the first corner wall connecting an outer surface of the side wall and an outer surface of the first end wall. A portion of the first insulating layer covers at least a portion of the first corner wall.

19. The battery device of claim 18, wherein, In a projection plane perpendicular to the first direction, an area of a footprint of the first end wall is S1, and an area of a footprint of the first insulating layer is S2, and 1<S2 / S1≤1.

2.

20. The battery device of claim 5 or 6, wherein The second insulating layer does not extend to the first end wall.

21. The battery device of any one of claims 5-11, wherein, A connection strength of the first insulating layer to the first end wall is greater than a connection strength of the second insulating layer to the side wall.

22. The battery device of any one of claims 5-11, wherein, The first insulating layer is an insulating coating, and the second insulating layer is an insulating film.

23. The battery device of claim 22, wherein, The connection strength of the first insulating layer to the first end wall is 5 MPa to 15 MPa.

24. The battery device of claim 23, wherein, The connection strength of the first insulating layer to the first end wall is 7 MPa to 11 MPa.

25. The battery device of any one of claims 5-11, wherein, The battery device further includes a thermal management component for managing a temperature of the battery cell. A portion of the first insulating layer and a portion of the second insulating layer overlap, forming an overlapping region, the overlapping region including a first area located at the side wall. A plurality of the battery cells are arranged along a second direction, and along the second direction, the thermal management component is arranged between two adjacent battery cells, the second insulating layer includes a second portion that does not overlap the first insulating layer, the thermal management component directly or indirectly abuts against the second portion, the first area and the thermal management component are not in contact, and the first direction intersects the second direction.

26. The battery device of claim 25, wherein, Along the second direction, there is a gap between the first area and the thermal management component.

27. The battery device of any one of claims 5-11, wherein, The battery device further includes a thermal management component for managing a temperature of the battery cell. A portion of the first insulating layer and a portion of the second insulating layer overlap, forming an overlapping region, the overlapping region including a first area located at the side wall. A plurality of the battery cells are arranged along a second direction, and along the second direction, the thermal management component is arranged between two adjacent battery cells, the thermal management component has an avoiding portion configured to avoid the first area.

28. The battery device of claim 27, wherein the battery device is a battery device as defined in any one of claims 1 to 26. Along the first direction, the thermal management component includes a first segment and a second segment connected to each other, the first segment is closer to the first area than the second segment, a thickness of the first segment is less than a thickness of the second segment, and a side of the first segment facing the first area forms the avoiding portion.

29. The battery device of claim 27, wherein the battery device is a battery device for a mobile phone. The thickness of the thermal management component gradually decreases from the middle to both ends of the thermal management component along the first direction to form the avoidance portion on the side of the thermal management component facing the first region.

30. The battery device of any one of claims 5-11, wherein, The battery device further comprises a thermal management component for managing the temperature of the battery cell; The first insulating layer and the second insulating layer are partially overlapped to form an overlapping region, and the overlapping region comprises a first region of the side wall; A plurality of battery cells are arranged along a second direction, and the thermal management component is arranged between two adjacent battery cells along the second direction, and the projection of the thermal management component on the first region is not overlapped.

31. The battery device of any one of claims 5-11, wherein, The outer surface of the first end wall has a fourth region which is not covered by the second insulating layer, and the area of the orthographic projection of the fourth region in the projection plane perpendicular to the first direction is greater than the area of the orthographic projection of the adhesive layer.

32. The battery device of any one of claims 5-11, wherein, The shell comprises a shell body and an end cover, the shell body has an opening, and the end cover closes the opening, the shell body comprises a first end wall and a side wall, and the first end wall is arranged opposite to the end cover.

33. The battery device of claim 32, wherein the battery device is a lithium ion battery device. The end cover supports the electrode assembly.

34. The battery device of any one of claims 5-11, wherein, The box body comprises a connecting portion opposite to the first end wall along the first direction, and the adhesive layer connects the first insulating layer and the connecting portion.

35. The battery device of any one of claims 5-11, wherein, The thickness of the first insulating layer is T, and 60 μm≤T≤240 μm.

36. The battery device of any one of claims 5-11, wherein, The interlayer adhesive strength of the adhesive layer is less than the adhesive strength between the adhesive layer and the box body.

37. An electrical device, comprising: The battery device comprises any one of claims 1-36.

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