Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, a first electrode assembly, a second electrode assembly and an accommodating part, the housing has a first wall. The first electrode assembly and the second electrode assembly are both contained in the shell and arranged in the thickness direction of the first wall, the second electrode assembly is located between the first wall and the first electrode assembly, and the first wall is configured to support the second electrode assembly. The accommodating part is arranged in the shell, an accommodating cavity is formed in the accommodating part, and the first electrode assembly and the electrolyte are accommodated in the accommodating cavity; the first electrode assembly is of a structure accommodated in the accommodating part, and the accommodating part can also accommodate the electrolyte, so that the phenomenon that the electrolyte infiltration effect of the first electrode assembly is poor after the electrolyte in the shell sinks to the bottom in the thickness direction of the first wall can be relieved, the infiltration effect of the first electrode assembly is improved, and the service life of the first electrode assembly is prolonged. Therefore, the use performance of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the core components of new energy vehicles, batteries have high requirements in terms of performance. Among them, the battery cell of the battery usually includes a shell and an electrode assembly contained in the shell. In order to improve the energy density and capacitance of the battery cell, a plurality of electrode assemblies are usually arranged in the shell of the battery cell. However, after stacking a plurality of electrode assemblies in the battery cell, it is easy for some electrode assemblies to have poor electrolyte wetting effect, resulting in poor performance of the battery cell. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the performance of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, a first electrode assembly, a second electrode assembly and a receiving piece; the shell has a first wall; the first electrode assembly and the second electrode assembly are both received in the shell and arranged along the thickness direction of the first wall, the second electrode assembly is located between the first wall and the first electrode assembly, and the first wall is configured to support the second electrode assembly; the receiving piece is disposed in the shell, and a receiving cavity is formed inside the receiving piece, and the receiving cavity receives the first electrode assembly and an electrolyte.

[0005] In the above technical solution, a first electrode assembly and a second electrode assembly arranged along the thickness direction of the first wall are arranged in the outer shell, the second electrode assembly is located between the first wall and the first electrode assembly, and the first wall is used to support the second electrode assembly, so that the first electrode assembly is a structure located on the upper side of the second electrode assembly, and a receiving piece is arranged in the outer shell, and a receiving cavity for accommodating the first electrode assembly and the electrolyte is formed inside the receiving piece, so that the first electrode assembly is a structure accommodated inside the receiving piece, and the receiving piece can also accommodate the electrolyte, thereby effectively alleviating the phenomenon that the electrolyte in the outer shell sinks to the bottom along the thickness direction of the first wall, resulting in poor electrolyte infiltration of the first electrode assembly, so that the first electrode assembly located on the upper side of the second electrode assembly can be fully infiltrated by the electrolyte accommodated in the receiving piece, which is beneficial to improving the infiltration effect of the first electrode assembly, so as to improve the performance of the battery cell.

[0006] In some embodiments, a first through hole is provided on the outer peripheral surface of the receiving member, the first through hole is connected to the accommodating cavity, and along the thickness direction of the first wall, the first through hole is located between the end surfaces at both ends of the first electrode assembly.

[0007] In the above technical solution, a first through hole connecting the accommodating cavity inside the accommodating cavity is provided on the outer peripheral surface of the accommodating cavity, and the first through hole is located between the end surfaces of the two ends of the first electrode assembly in the thickness direction of the first wall, so that part of the first electrode assembly is located on the lower side of the first through hole in the first direction, so that the electrolyte contained in the accommodating cavity can effectively infiltrate the first electrode assembly, and the excess electrolyte in the accommodating cavity of the accommodating cavity can overflow out of the accommodating cavity through the first through hole and infiltrate the second electrode assembly located outside the accommodating cavity, thereby improving the wetting effect of the electrolyte of the first electrode assembly while also improving the utilization rate of the electrolyte and improving the wetting effect of the second electrode assembly.

[0008] In some embodiments, a plurality of the first through holes are disposed on the receiving member, and the plurality of the first through holes are arranged at intervals along the circumference of the first electrode assembly.

[0009] In the above technical solution, a plurality of first through holes are provided on the receiving member, and the plurality of first through holes are arranged at intervals along the circumference of the first electrode assembly, thereby being able to improve the efficiency of the electrolyte overflowing out of the receiving cavity, so that the excess electrolyte can quickly overflow out of the receiving cavity and contact and infiltrate the second electrode assembly.

[0010] In some embodiments, the battery cell further includes a first insulating member; the first insulating member is disposed between the first electrode assembly and the receiving member, and a projection of the first through hole in an axial direction thereof is located within the first insulating member.

[0011] In the above technical solution, a first insulating member is arranged between the first electrode assembly and the receiving member, and the projection of the first through hole in its axial direction is located inside the first insulating member, so that the first insulating member can play a certain shielding role on the area of ​​the first electrode assembly corresponding to the first through hole, so as to reduce the risk of short-circuiting other components with the first electrode assembly after passing through the first through hole, thereby helping to improve the reliability of the battery cell.

[0012] In some embodiments, the first insulating member is disposed around the first electrode assembly around an axis extending in a thickness direction of the first wall.

[0013] In the above technical solution, by setting the first insulating part as a structure surrounding the outside of the first electrode assembly, on the one hand, the structural stability of the first insulating part assembled between the first electrode assembly and the receiving part can be improved, which is beneficial to reduce the risk of the first insulating part falling off during use; on the other hand, the shielding effect of the first insulating part on the area of ​​the first electrode assembly corresponding to the first through hole can be further improved, so as to further reduce the risk of short-circuiting other components with the first electrode assembly after passing through the first through hole.

[0014] In some embodiments, the first insulating member is bonded to the first electrode assembly.

[0015] In the above technical solution, by setting the first insulating member to a structure bonded to the outer side of the first electrode assembly, the structural stability of the first insulating member set on the first electrode assembly can be further improved, and the difficulty of assembling the first insulating member between the first electrode assembly and the receiving member can be reduced, which is beneficial to improving the assembly efficiency of the battery cell.

[0016] In some embodiments, along the thickness direction of the first wall, the housing has a second wall arranged opposite to the first wall, and the second wall is provided with a liquid injection hole, and the liquid injection hole is communicated with the accommodating cavity.

[0017] In the above technical solution, by providing an injection hole on the second wall of the housing, and the injection hole is connected to the receiving cavity of the receiving member, the electrolyte can be directly injected into the receiving cavity of the receiving member through the injection hole, without first assembling the electrolyte into the receiving member and then assembling the receiving member into the housing, which is conducive to optimizing the assembly process of the battery cell, and can reduce the difficulty of assembling the electrolyte into the receiving cavity of the receiving member, so as to improve the production efficiency of the battery cell. In addition, in the embodiment where the first through hole is provided on the outer peripheral surface of the receiving member, after the battery cell adopting this structure can directly inject the electrolyte into the receiving cavity of the receiving member through the injection hole, the electrolyte can also overflow into the housing through the first through hole to infiltrate the second electrode assembly, so that there is no need to separately provide an injection hole for the second electrode assembly, and then the effect of infiltrating the first electrode assembly and the second electrode assembly can be achieved through one injection, which is simple to operate, can effectively reduce the difficulty of assembling the battery cell, and can optimize the production rhythm of the battery cell.

[0018] In some embodiments, along the thickness direction of the first wall, the outer shell has a second wall arranged opposite to the first wall; the battery cell also includes a second insulating member, which is arranged on the side of the second wall facing the first electrode assembly, and the second insulating member is configured to insulate and isolate the second wall and the first electrode assembly; wherein, the receiving member is connected to the second insulating member at one end facing the second wall in the thickness direction of the first wall.

[0019] In the above technical solution, a second insulating member is also provided in the housing of the battery cell, and the second insulating member is provided between the second wall and the first electrode assembly, so that the second insulating member can insulate and isolate the first electrode assembly and the second wall, thereby reducing the risk of short circuit between the first electrode assembly and the second wall. In addition, by connecting the end of the receiving member close to the second wall in the thickness direction of the first wall to the second insulating member, it is helpful to further improve the structural stability of the receiving member when assembled in the housing, so as to reduce the shaking of the receiving member during use, and can alleviate the phenomenon that the overall gravity of the receiving member and the first electrode assembly acts on the second electrode assembly.

[0020] In some embodiments, the receiving member is connected to the second insulating member by thermal melting.

[0021] In the above technical solution, the receiving piece and the second insulating piece are connected by hot-melt connection, so that the receiving piece is connected to the second insulating piece. The structure is simple, the connection stability is high, and it is beneficial to improve the sealing effect after the receiving piece and the second insulating piece are connected to each other.

[0022] In some embodiments, the accommodating cavity is formed with a first opening at one end of the first wall in the thickness direction of the first wall and close to the second wall, and the second insulating member closes the first opening.

[0023] In the above technical solution, the accommodating cavity of the receiving member is formed with a first opening at one end close to the second wall in the thickness direction of the first wall, and the first opening is closed by the third insulating member, so as to facilitate the injection of electrolyte into the accommodating cavity through the first opening, and the first opening of the receiving member can be closed by the second insulating member, without the need to design a separate sealing process for the first opening of the receiving member, which is conducive to optimizing the production rhythm of the battery cell.

[0024] In some embodiments, the receiving member includes two diaphragms; the two diaphragms are arranged along a first direction, and the two diaphragms together enclose the accommodating cavity; wherein, the diaphragm forms a first connection area near one end of the first wall in the thickness direction of the first wall, the first connection areas of the two diaphragms are stacked and connected, and two second connection areas are respectively formed at both ends of the diaphragm in the second direction, the second connection areas of the two diaphragms are correspondingly stacked and connected, and the thickness direction of the first wall, the first direction and the second direction are perpendicular to each other.

[0025] In the above technical solution, the receiving member is provided with two diaphragms arranged in a first direction, and the first connection areas of the two diaphragms are stacked and connected to each other, and the second connection areas of the two diaphragms at both ends of the second direction are stacked and connected to each other, so that the two diaphragms are connected to each other to jointly enclose a receiving cavity for accommodating the first electrode assembly and the electrolyte, and the structure is simple and easy to implement.

[0026] In some embodiments, the first connection areas of the two film sheets are connected by heat melting; and / or the second connection areas of the two film sheets are connected by heat melting.

[0027] In the above technical solution, the first connection areas of the two membranes are connected to each other through a hot melt connection structure, which has a simple structure, high stability, and is conducive to improving the sealing effect after the two first connection areas are connected to each other. Similarly, the second connection areas of the two membranes are connected to each other through a hot melt connection structure, which has a simple structure, high stability, and is conducive to improving the sealing effect after the two second connection areas are connected to each other.

[0028] In some embodiments, the first electrode assembly includes a first main body and a first electrode tab connected to each other, the second electrode assembly includes a second main body and a second electrode tab connected to each other, the second main body and the first main body are arranged along the thickness direction of the first wall, and the first electrode tab is electrically connected to the second electrode tab; the battery cell also includes a mounting frame, the mounting frame is accommodated in the outer shell and is located on the outside of the receiving member, along the thickness direction of the first wall, the mounting frame is arranged between the first main body and the second main body, the mounting frame is configured to separate the first main body and the second main body; wherein, the mounting frame is provided with an avoidance groove on the side facing the first main body in the thickness direction of the first wall, and the avoidance groove is used to accommodate the first connection areas of the two diaphragms.

[0029] In the above technical solution, by arranging a mounting frame between the first body and the second body arranged along the thickness direction of the first wall, the mounting frame can separate the first body and the second body. On the one hand, the mounting frame can play a role in stabilizing the assembly of the first body and the second body, which is conducive to reducing the stability of the first electrode assembly and the second electrode assembly assembled into the shell. On the other hand, it can reduce the phenomenon of the first body and the second body colliding with each other during use. In addition, by arranging an avoidance groove for accommodating the first connection area of ​​the two diaphragms on the side of the mounting frame facing the first body, the avoidance groove of the mounting frame can avoid the first connection area of ​​the two diaphragms, which is conducive to reducing the interference between the mounting frame and the first connection area of ​​the diaphragms, and can improve the internal space utilization rate of the battery cell.

[0030] In some embodiments, the receiving member is made of insulating material.

[0031] In the above technical solution, by setting the receiving piece to an insulating material, the first electrode assembly contained in the receiving cavity of the receiving piece can also be insulated and isolated from the outer shell or other components through the receiving piece, which is beneficial to reduce the risk of short circuit between the first electrode assembly and the outer shell or other components.

[0032] In some embodiments, both the first electrode assembly and the second electrode assembly are wound structures formed by winding around an axis extending in the thickness direction of the first wall.

[0033] In the above technical solution, the first electrode assembly and the second electrode assembly are both arranged as a winding structure formed by winding around an axis extending in the thickness direction of the first wall, so that the first electrode assembly and the second electrode assembly are structures arranged in the outer shell along their axial direction. The battery cell adopting this structure can increase the length dimension of the battery cell in the thickness direction of the first wall while optimizing the dimension of the single electrode assembly accommodated in the outer shell in the thickness direction of the first wall. There is no need to increase the winding dimension of the first electrode assembly or the second electrode assembly in the thickness direction of the first wall, thereby effectively reducing the difficulty of winding the first electrode assembly and the second electrode assembly, and reducing the difficulty of assembling the battery cell, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0034] In some embodiments, the length direction of the shell is consistent with the thickness direction of the first wall, and the length of the shell is L, satisfying that L≥200 mm.

[0035] In the above technical solution, the length of the outer shell is set to be greater than or equal to 200 mm to increase the length dimension of the battery cell in the thickness direction of the first wall, and while realizing the battery cell having a larger length, the first electrode assembly and the second electrode assembly in the outer shell are set to a structure arranged along the thickness direction of the first wall, so that while realizing the length of the outer shell of the battery cell in the thickness direction of the first wall being greater than or equal to 200 mm, the size of the single electrode assembly accommodated in the outer shell in the thickness direction of the first wall can be optimized, and there is no need to increase the winding size of the first electrode assembly or the second electrode assembly in the thickness direction of the first wall to reduce the difficulty of winding the first electrode assembly and the second electrode assembly, and the difficulty of assembling the battery cell can be reduced, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0036] In some embodiments, the length direction of the shell is consistent with the thickness direction of the first wall, and the length of the shell is L, satisfying that L≥250mm.

[0037] In the above technical solution, by further setting the length of the outer shell to be greater than or equal to 250 mm, the length dimension of the battery cell in the thickness direction of the first wall is further increased, so that while achieving the length of the outer shell of the battery cell in the thickness direction of the first wall being greater than or equal to 250 mm, the dimension of the single electrode assembly accommodated in the outer shell in the thickness direction of the first wall can also be optimized. There is no need to increase the winding dimension of the first electrode assembly or the second electrode assembly in the thickness direction of the first wall to reduce the difficulty of winding the first electrode assembly and the second electrode assembly, and the difficulty of assembling the battery cell can be reduced, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0038] In some embodiments, the first electrode assembly and the second electrode assembly are electrically connected.

[0039] In the above technical solution, the first electrode assembly and the second electrode assembly are arranged to be electrically connected to each other, so that the first electrode assembly and the second electrode assembly are connected in parallel or in series inside the outer shell. Therefore, only two electrode output terminals need to be arranged on the outer shell to realize the input or output of the positive and negative electrodes of the battery cell, thereby reducing the production cost of the battery cell and optimizing the production rhythm of the battery cell to improve the production efficiency of the battery cell.

[0040] In some embodiments, the first electrode assembly includes a first body and a first electrode tab, and the second electrode assembly includes a second body and a second electrode tab, and the second body and the first body are arranged along the thickness direction of the first wall; wherein, along the thickness direction of the first wall, the first electrode tab is arranged at one end of the first body facing the second body, and the second electrode tab is arranged at one end of the second body facing the first body, and the second electrode tab is connected to the first electrode tab to electrically connect the first electrode assembly and the second electrode assembly.

[0041] In the above technical solution, the first body of the first electrode assembly and the second body of the second electrode assembly are arranged along the first direction, and the first pole ear of the first electrode assembly is arranged at one end of the first body facing the second body, and correspondingly, the second pole ear of the second electrode assembly is arranged at one end of the second body facing the first body, so that the first pole ear is connected to the second pole ear to achieve electrical connection between the first electrode assembly and the second electrode assembly. The battery cell adopting this structure facilitates the electrical connection between the first electrode assembly and the second electrode assembly, which is beneficial to reduce the difficulty of electrical connection between the first electrode assembly and the second electrode assembly, so as to improve the assembly efficiency of the battery cell.

[0042] In some embodiments, the battery cell also includes a converter; the converter connects the first pole lug and the second pole lug, the first pole lug is located in the accommodating cavity, the second pole lug is located outside the receiving member, and the receiving member is provided with a channel for the converter to pass through at one end close to the second body in the thickness direction of the first wall.

[0043] In the above technical solution, an adapter is also provided in the outer shell of the battery cell. By passing the adapter through the channel of the receiving piece in the thickness direction of the first wall close to one end of the second main body, the adapter can connect the first pole ear of the first electrode assembly located inside the receiving piece and the second pole ear of the second electrode assembly located outside the receiving piece, so as to realize the connection between the first pole ear and the second pole ear. The battery cell adopting this structure does not need to set the first pole ear of the first electrode assembly as a structure passing through the receiving piece, and does not need to set the second pole ear of the second electrode assembly as a structure inserted into the accommodating cavity of the receiving piece. Therefore, by setting the adapter as a structure that connects the first pole ear and the second pole ear after passing through the receiving piece, the difficulty of connecting the first pole ear and the second pole ear to each other can be reduced, and the adapter is easier to pass through the channel of the receiving piece than the first pole ear, which is beneficial to reduce the difficulty of assembling the battery cell.

[0044] In some embodiments, the battery cell further includes a seal; the seal is disposed between the adapter and the receiving member, and the seal is configured to seal a gap between the adapter and the receiving member.

[0045] In the above technical solution, a seal is provided between the adapter and the receiving component so that the seal can seal the gap between the adapter and the receiving component, thereby improving the sealing between the adapter and the receiving component after the adapter passes through the receiving component, thereby reducing the leakage of electrolyte from the channel of the receiving component, and thereby ensuring that there is sufficient electrolyte in the accommodating cavity of the receiving component for the first electrode assembly to be infiltrated.

[0046] In some embodiments, the receiving member includes two diaphragms; the two diaphragms are arranged along a first direction, and the two diaphragms together enclose the accommodating cavity; wherein, the diaphragm forms a first connecting area at one end close to the first wall in the thickness direction of the first wall, the first connecting areas of the two diaphragms are stacked and connected, and the channel is formed between the first connecting areas of the two diaphragms.

[0047] In the above technical solution, the receiving piece is provided with two diaphragms arranged in a first direction, and the channel for the adapter to pass through is formed by the first connection areas of the two diaphragms being stacked and enclosed together, so that the adapter is a structure clamped by the first connection areas of the two first diaphragms, so that the adapter passes through the first connection areas of the two diaphragms, thereby eliminating the need to separately open a channel on the receiving piece for the adapter to pass through, which is beneficial to reducing the manufacturing difficulty of the receiving piece, and after the adapter passes through the channel, it is convenient to stack the first connection areas of the two diaphragms and the adapter and connect them into one, which is beneficial to improving the stability of the adapter passing through the channel.

[0048] In some embodiments, the battery cell also includes a mounting frame; the mounting frame is accommodated in the outer shell and is located on the outside of the receiving member, and along the thickness direction of the first wall, the mounting frame is arranged between the first body and the second body, and the mounting frame is configured to separate the first body and the second body; wherein, the mounting frame is provided with an avoidance hole, and the avoidance hole passes through the mounting frame along the thickness direction of the first wall, and the adapter and the second pole ear are both inserted in the avoidance hole.

[0049] In the above technical solution, a mounting frame is provided between the first body and the second body arranged along the thickness direction of the first wall, so that the mounting frame can separate the first body and the second body. On the one hand, the mounting frame can play a role in stabilizing the assembly of the first body and the second body, which is conducive to reducing the stability of the first electrode assembly and the second electrode assembly being assembled into the shell. On the other hand, it can reduce the phenomenon of the first body and the second body colliding with each other during use. In addition, the mounting frame is provided with avoidance holes that penetrate through both sides of the mounting frame along the thickness direction of the first wall, and the adapter and the second pole ear are both inserted into the avoidance holes. The battery cell adopting this structure can reduce the difficulty of connecting the adapter and the second pole ear on the one hand, which is conducive to reducing the obstruction of the mounting frame to the adapter. On the other hand, the mounting frame can also play a certain role in stabilizing and protecting the adapter and the second pole ear, which is conducive to reducing the phenomenon of shaking or damage of the adapter and the second pole ear during use, so as to improve the stability and service life of the battery cell.

[0050] In some embodiments, the mounting frame includes a first frame body and a second frame body that are detachably connected to each other, the first frame body and the second frame body are arranged along a first direction, and the first frame body and the second frame body together enclose the avoidance hole, and the first direction is perpendicular to the thickness direction of the first wall.

[0051] In the above technical solution, the mounting frame is provided with a first frame body and a second frame body arranged along a first direction. The first frame body and the second frame body are arranged as a detachably connected structure, and the first frame body and the second frame body jointly enclose a avoidance hole for inserting the adapter and the second pole ear. The mounting frame adopting such a structure is convenient for assembling the adapter and the second pole ear into the avoidance hole after the adapter and the second pole ear are connected to each other, which is conducive to reducing the difficulty of assembling the adapter and the second pole ear into the avoidance hole. On the other hand, it is convenient to assemble the mounting frame between the first body and the second body, and it is convenient to maintain the adapter and the second pole ear after quickly disassembling and assembling the first frame body and the second frame in the later stage.

[0052] In some embodiments, a first groove is provided on a side of the first frame body facing the second frame body, and the first groove penetrates the first frame body along the thickness direction of the first wall; a second groove is provided on a side of the second frame body facing the first frame body, and the second groove penetrates the second frame body along the thickness direction of the first wall; the second groove and the first groove enclose the avoidance hole.

[0053] In the above technical solution, a first groove is provided on a side of the first frame body facing the second frame body, and a second groove is provided on a side of the second frame body facing the first frame body, so that after the first frame body and the second frame body are assembled with each other along the first direction, the first groove and the second groove can be jointly enclosed to form an avoidance hole for accommodating the adapter and the second pole ear, and the structure is simple and easy to implement.

[0054] In some embodiments, a clamping portion is disposed on a side of the first frame body facing the second frame body, and a clamping hole is disposed on a side of the second frame body facing the first frame body, wherein the clamping portion is clamped into the clamping hole.

[0055] In the above technical solution, a snap-in portion is provided on the side of the first frame facing the second frame, and correspondingly, a snap-in hole for the snap-in portion to be inserted into is provided on the side of the second frame facing the first frame, so that a detachable connection between the first frame and the second frame is achieved through the snap-in cooperation between the snap-in portion and the snap-in hole. The structure is simple and easy to assemble.

[0056] In some embodiments, the first pole ear includes a first root portion and a first pole ear portion, the first root portion connects the first pole ear portion and the first main body, and the first pole ear portion is connected to the adapter; wherein, along the thickness direction of the first wall, a first accommodating groove is provided on the side of the mounting frame facing the first main body, the first accommodating groove is used to accommodate the first root portion, and the avoidance hole passes through the bottom surface of the first accommodating groove.

[0057] In the above technical solution, a first accommodating groove for accommodating the first root of the first pole ear is provided on the side of the mounting frame facing the first main body, and the avoidance hole is a structure that penetrates the bottom surface of the first accommodating groove. Thus, on the one hand, after the first root of the first pole ear partially arches the receiving piece, the mounting frame can avoid the first root of the first pole ear to reduce the phenomenon of the mounting frame squeezing and damaging the first pole ear. On the other hand, it is convenient for the adapter to be connected to the first pole ear and pass through the channel of the receiving piece before being inserted into the avoidance hole for assembly connection with the second pole ear.

[0058] In some embodiments, along the thickness direction of the first wall, the first root portion has a first surface facing away from the first body, the first pole ear portion protrudes from the first surface, and the first surface matches with the bottom surface of the first accommodating groove.

[0059] In the above technical solution, by setting the first surface of the first root portion facing the bottom surface of the first accommodating groove to a structure that fits with the bottom surface of the first accommodating groove, the bottom surface of the first accommodating groove can be indirectly fitted with the first surface of the first root portion through the receiving member, so that the bottom surface of the first accommodating groove can also play a certain shaping and gathering role on the first root portion of the first pole lug, which is beneficial to maintaining the shape of the first root portion of the first pole lug.

[0060] In some embodiments, the second pole ear includes a second root portion and a second pole ear portion, the second root portion connects the second pole ear portion and the second main body, the second pole ear portion is inserted into the avoidance hole, and the second pole ear portion is connected to the adapter; wherein, along the thickness direction of the first wall, a second accommodating groove is provided on the side of the mounting frame facing the second main body, the second accommodating groove is used to accommodate the second root portion, and the avoidance hole passes through the bottom surface of the second accommodating groove.

[0061] In the above technical solution, a second accommodating groove for accommodating the second root of the second pole lug is provided on the side of the mounting frame facing the second main body, and the avoidance hole is a structure that penetrates the bottom surface of the second accommodating groove. Thus, on the one hand, the mounting frame can avoid the second root of the second pole lug to reduce the phenomenon of the mounting frame squeezing and damaging the second pole lug, and on the other hand, it is convenient for the second pole lug portion of the second pole lug to be inserted into the avoidance hole for assembly connection with the adapter.

[0062] In some embodiments, along the thickness direction of the first wall, the second root portion has a second surface facing away from the second body, the second pole ear portion protrudes from the second surface, and the second surface matches with the bottom surface of the second accommodating groove.

[0063] In the above technical solution, the second surface of the second root facing the bottom of the second accommodating groove is set to a structure that fits with the bottom of the second accommodating groove, so that the bottom of the second accommodating groove can fit with the second surface of the second root, so that the bottom of the second accommodating groove can also play a certain shaping and gathering role on the second root of the second pole lug, which is beneficial to maintaining the shape of the second root of the second pole lug.

[0064] In some embodiments, the mounting frame is provided with a second through hole, the second through hole penetrates the mounting frame along the thickness direction of the first wall, and the second through hole is configured to allow electrolyte to pass through.

[0065] In the above technical solution, by arranging a second through hole on the mounting frame that passes through both sides of the mounting frame along the thickness direction of the first wall, the electrolyte can flow between the first electrode assembly and the second electrode assembly through the second through hole, which is beneficial to improving the fluidity of the electrolyte between the first electrode assembly and the second electrode assembly to improve the wetting effect of the first electrode assembly and the second electrode assembly, and on the other hand, it is convenient for the gas generated between the first electrode assembly and the second electrode assembly to flow from the second through hole.

[0066] In some embodiments, a plurality of the second through holes are disposed on the mounting frame.

[0067] In the above technical solution, by arranging a plurality of second through holes on the mounting frame, it is helpful to further improve the fluidity of the electrolyte between the first electrode assembly and the second electrode assembly, so as to further improve the wetting effect of the first electrode assembly and the second electrode assembly, and can further improve the flow effect of the gas generated between the first electrode assembly and the second electrode assembly.

[0068] In some embodiments, a cavity is formed inside the mounting bracket, and the cavity is connected to the second through hole.

[0069] In the above technical solution, a cavity is provided inside the mounting frame, and the cavity is interconnected with the second through hole, that is, the second through hole is a structure that penetrates the inner wall surface of the cavity. The mounting frame adopting such a structure can, on the one hand, reduce the weight of the mounting frame by providing the cavity, so as to reduce the overall weight of the battery cell, which is beneficial to improving the energy density of the battery cell; on the other hand, the cavity can also play a certain buffering role for the electrolyte, which is beneficial to further improve the wetting effect of the first electrode assembly and the second electrode assembly.

[0070] In some embodiments, the battery cell further includes a connecting member; the connecting member connects the mounting frame, the receiving member and the second body.

[0071] In the above technical solution, the battery cell is also provided with a connecting piece connecting the mounting frame, the receiving piece and the second main body, so that the mounting frame, the second main body and the receiving piece covered on the outside of the first electrode assembly can be connected as a whole through the connecting piece, which is beneficial to improving the structural stability of the mounting frame arranged between the first main body and the second main body, thereby reducing the risk of shaking or detachment of the mounting frame between the first main body and the second main body.

[0072] In some embodiments, the connecting member is bonded to the mounting frame, the receiving member and the second body.

[0073] In the above technical solution, the connecting member is set as a structure bonded to the mounting frame, the receiving member and the second main body to connect the mounting frame, the receiving member and the second main body into a whole. The battery cell using this structure is beneficial to reduce the difficulty of assembling the connecting member to connect the mounting frame, the receiving member and the second main body, so as to improve the assembly efficiency of the battery cell.

[0074] In some embodiments, the connecting member surrounds the outer sides of the mounting frame, the receiving member and the second body around an axis extending along the thickness direction of the first wall.

[0075] In the above technical solution, by setting the connecting member as an annular structure arranged around the mounting frame, the receiving member and the second main body, the connecting member is covered on the outside of the mounting frame, the receiving member and the second main body, which is beneficial to further improve the structural stability of the connecting member connecting the mounting frame, the receiving member and the second main body, and further improve the structural stability of the mounting frame arranged between the first main body and the second main body, so as to reduce the risk of shaking or detachment of the mounting frame between the first main body and the second main body.

[0076] In some embodiments, a first through hole is provided on the outer peripheral surface of the receiving member, and the first through hole is connected to the accommodating cavity; wherein the projection of the first through hole in the axial direction thereof does not overlap with the connecting member.

[0077] In the above technical solution, a first through hole connected to the internal accommodating cavity of the accommodating cavity is provided on the outer peripheral surface of the accommodating member, so that excess electrolyte in the accommodating member can overflow out of the accommodating cavity through the first through hole and infiltrate the second electrode assembly located outside the accommodating member. By arranging the first through hole so that its axial projection does not overlap with the connecting member, the connecting member is made to have a structure that does not cover the first through hole, thereby reducing the obstruction of the connecting member to the electrolyte, so that the electrolyte located in the accommodating cavity can smoothly overflow out of the accommodating cavity through the first through hole.

[0078] In some embodiments, the first electrode assembly includes two first pole ears, the two first pole ears have opposite polarities and are both arranged at one end of the first body facing the second body; the second electrode assembly includes two second pole ears, the two second pole ears have opposite polarities and are both arranged at one end of the second body facing the first body; wherein the first pole ears with the same polarity are connected to the second pole ears.

[0079] In the above technical solution, the two first pole ears with opposite polarities of the first electrode assembly are both arranged at the end of the first body facing the second body, and the two second pole ears with opposite polarities of the second electrode assembly are both arranged at the end of the second body facing the first body. The first pole ears are interconnected with the corresponding second pole ears with the same polarity to achieve parallel connection between the first electrode assembly and the second electrode assembly, thereby achieving electrical connection between the first electrode assembly and the second electrode assembly. The structure is simple and easy to assemble.

[0080] In some embodiments, along the thickness direction of the first wall, the outer shell has a second wall arranged opposite to the first wall; the battery cell also includes two electrode terminals, both of which are insulated and installed on the second wall, and the electrode terminals are used to output or input electrical energy of the battery cell; wherein the first electrode assembly also includes two third pole ears, the two third pole ears have opposite polarities and are arranged at one end of the first body facing the second wall along the thickness direction of the first wall, and the two third pole ears are respectively connected to the two electrode terminals.

[0081] In the above technical solution, two third pole ears are arranged at one end of the first main body of the first electrode assembly facing the second wall, and the two third pole ears are correspondingly connected to the two electrode terminals arranged on the second wall to realize the input or output of electric energy of the battery cell. After the first electrode assembly and the second electrode assembly are electrically connected to each other, the battery cell adopting this structure only needs to be connected to the electrode terminal through the third pole ear to realize the input or output of electric energy of the battery cell, and there is no need to set up multiple electrode output terminals. Therefore, while increasing the length dimension of the battery cell in the thickness direction of the first wall, only two electrode terminals are needed to realize the input or output of electric energy of the battery cell, thereby effectively reducing the difficulty of assembling the battery cell, which is beneficial to reducing the manufacturing cost of the battery cell and improving the production efficiency of the battery cell.

[0082] In some embodiments, the battery cell further includes a third insulating member, which is wrapped around an axis extending in the thickness direction of the first wall and outsides of the receiving member and the second electrode assembly, and is configured to insulate and isolate the second electrode assembly from the outer shell.

[0083] In the above technical solution, the battery cell is also provided with a third insulating member, and the third insulating member is coated on the outside of the receiving member and the second electrode assembly. On the one hand, the third insulating member can separate the first electrode assembly and the outer shell as well as the second electrode assembly and the outer shell, which is beneficial to reduce the risk of short circuit between the first electrode assembly and the outer shell as well as between the second electrode assembly and the outer shell, so as to improve the reliability of the battery cell. On the other hand, the third insulating member can further fasten the second electrode assembly and the receiving member coated on the outside of the first electrode assembly, so as to realize the connection of the first electrode assembly and the second electrode assembly arranged along the thickness direction of the first wall as a whole, which is beneficial to improve the overall structural stability of the first electrode assembly and the second electrode assembly.

[0084] In some embodiments, the shell includes a shell and an end cover; the shell includes an integrally formed side wall and the first wall, the side wall is arranged around the first wall, along the thickness direction of the first wall, one end of the side wall is connected to the first wall, and the other end is enclosed to form a second opening, the side wall and the first wall jointly define a storage space for accommodating the first electrode assembly and the second electrode assembly; the end cover closes the second opening.

[0085] In the above technical solution, by setting the first wall of the shell to be a wall of the shell arranged opposite to the end cover in the first direction, the first electrode assembly and the second electrode assembly accommodated in the shell are structures supported by the bottom wall of the shell. This structure enables the opening of the shell to be located on the upper side of the shell, which is beneficial to reduce the risk of leakage of the battery cell during use due to connection failure between the end cover and the shell.

[0086] In some embodiments, the outer shell includes a shell and an end cover; a receiving space having a second opening is formed inside the shell, and the receiving space is used to receive the first electrode assembly and the second electrode assembly; the end cover closes the second opening; wherein the end cover is the first wall.

[0087] In the above technical solution, by setting the first wall of the shell as the end cover of the shell for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the first electrode assembly and the second electrode assembly into the shell, and convenient for the end cover to support the second electrode assembly, which is beneficial to reduce the difficulty of assembling the battery cell and improve the production efficiency of the battery cell.

[0088] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0089] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0091] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0092] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0093] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0094] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0095] Figure 5 A schematic diagram of the structure of a first electrode assembly of a battery cell provided in some embodiments of the present application;

[0096] Figure 6 A schematic diagram of the structure of a second electrode assembly of a battery cell provided in some embodiments of the present application;

[0097] Figure 7 A schematic diagram of the structure of a battery cell receiving member provided in some embodiments of the present application;

[0098] Figure 8 An exploded view of the structure of a battery cell receiving member provided in some embodiments of the present application;

[0099] Fig. 9 A schematic diagram of assembling a first electrode assembly and a first insulating member of a battery cell provided in some embodiments of the present application;

[0100] Fig.10 A schematic diagram of assembling a receiving member and a second insulating member of a battery cell provided in some embodiments of the present application;

[0101] Fig.11 A schematic diagram of the structure of a mounting frame for a battery cell provided in some embodiments of the present application;

[0102] Fig.12 A front view of a mounting frame of a battery cell provided in some embodiments of the present application in a second direction;

[0103] Fig.13A schematic diagram of the connection between the first electrode assembly and the second electrode assembly of a battery cell provided in some embodiments of the present application;

[0104] Fig.14 A schematic diagram of the connection between the adapter and the seal of a battery cell provided in some embodiments of the present application;

[0105] Fig.15 A bottom view of a mounting frame for a battery cell provided in some embodiments of the present application;

[0106] Fig.16 A cross-sectional view of a mounting frame for a battery cell provided in some embodiments of the present application;

[0107] Fig.17 An exploded view of the structure of a mounting frame for a battery cell provided in some embodiments of the present application;

[0108] Fig.18 A cross-sectional view of a first electrode assembly of a battery cell provided in some embodiments of the present application;

[0109] Fig.19 A cross-sectional view of a second electrode assembly of a battery cell provided in some embodiments of the present application;

[0110] Fig. 20 A schematic diagram of assembling a first electrode assembly, a second electrode assembly and a connecting member provided in some embodiments of the present application;

[0111] Fig.21 Schematic diagram of the assembly of the first electrode assembly, the second electrode assembly and the third insulating member provided in some embodiments of the present application.

[0112] Icon: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-first wall; 212-housing; 2121-second opening; 213-end cover; 214-second wall; 2141-liquid injection hole; 22-first electrode assembly; 221-first body; 222-first pole ear; 2221-first root; 2221a-first surface; 2222-first pole ear; 223-third pole ear; 23-second electrode assembly; 231-second body; 232-second pole ear; 2321-second root; 2321a-second surface; 2322-second pole ear; 24-receiving piece; 241-accommodating cavity; 242-first through hole ;243-first opening;244-diaphragm;2441-first connection area;2442-second connection area;25-electrode terminal;26-pressure relief mechanism;27-first insulating member;28-second insulating member;29-mounting frame;291-avoidance groove;292-avoidance hole;293-first frame;2931-first groove;2932-clamping part;294-second frame;2941-second groove;2942-clamping hole;295-first accommodating groove;296-second accommodating groove;297-second through hole;298-cavity;30-adapter;31-seal;32-connector;33-third insulating member;200-controller;300-motor;X-thickness direction of the first wall;Y-first direction;Z-second direction. DETAILED DESCRIPTION

[0113] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0114] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0115] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0116] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0117] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0118] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0119] The term "plurality" used in the present application refers to two or more (including two).

[0120] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0121] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0122] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0123] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0124] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0125] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0126] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0127] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0128] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0129] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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 substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0130] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0131] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0132] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0133] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0134] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0135] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0136] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0137] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0138] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes, wherein the electrolyte includes an electrolyte salt and a solvent.

[0139] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0140] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl 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, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0141] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0142] In some embodiments, the electrode assembly is a laminate structure.

[0143] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0144] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0145] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0146] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0147] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0148] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0149] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0150] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as an electrode assembly. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0151] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0152] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0153] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0154] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0155] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0156] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0157] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters.

[0158] For a general battery cell, the battery cell usually includes a shell and an electrode assembly contained in the shell. As the demand for the energy density and capacity of the battery cell becomes higher and higher, in the related art, in order to improve the energy density and capacity of the battery cell, a plurality of electrode assemblies are usually stacked in the shell of the battery cell along the height direction of the battery cell to improve the energy density and capacity of the battery cell. However, since the electrolyte contained in the shell will sink to the bottom, the electrode assembly located on the upper side of the stacked multiple electrode assemblies cannot effectively contact the electrolyte, which makes it easy for some electrode assemblies in the multiple electrode assemblies to have poor electrolyte infiltration, thereby causing poor performance of the battery cell.

[0159] Based on the above considerations, in order to solve the problem of poor performance of the battery cell, an embodiment of the present application provides a battery cell, the battery cell includes a shell, a first electrode assembly, a second electrode assembly and a receiving member. The shell has a first wall. The first electrode assembly and the second electrode assembly are both accommodated in the shell and arranged along the thickness direction of the first wall, the second electrode assembly is located between the first wall and the first electrode assembly, and the first wall is configured to support the second electrode assembly. The receiving member is arranged in the shell, and a receiving cavity is formed inside the receiving member, and the receiving cavity accommodates the first electrode assembly and the electrolyte.

[0160] In a battery cell of this structure, a first electrode assembly and a second electrode assembly arranged along the thickness direction of the first wall are arranged in the outer shell, the second electrode assembly is located between the first wall and the first electrode assembly, and the first wall is used to support the second electrode assembly, so that the first electrode assembly is a structure located on the upper side of the second electrode assembly. A receiving piece is arranged in the outer shell, and a receiving cavity for accommodating the first electrode assembly and the electrolyte is formed inside the receiving piece, so that the first electrode assembly is a structure accommodated inside the receiving piece, and the receiving piece can also accommodate the electrolyte, thereby effectively alleviating the phenomenon that the electrolyte in the outer shell sinks to the bottom along the thickness direction of the first wall, resulting in poor electrolyte infiltration of the first electrode assembly, so that the first electrode assembly located on the upper side of the second electrode assembly can be fully infiltrated by the electrolyte accommodated in the receiving piece, which is beneficial to improving the infiltration effect of the first electrode assembly, thereby improving the performance of the battery cell.

[0161] The battery cell disclosed in the embodiment of the present application can be used in, but not limited to, electric devices such as vehicles, ships or aircraft. A power supply system comprising the battery cell and battery disclosed in the present application can be used to form the electric device, which is helpful to alleviate the problem of poor electrolyte infiltration of the electrode assembly in the battery cell, so as to improve the performance of the battery cell.

[0162] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0163] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0164] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0165] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use power source for 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.

[0166] Please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 The schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application is as follows. The battery 100 comprises a box body 10 and a battery cell 20 , and the battery cell 20 is used to be accommodated in the box body 10 .

[0167] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0168] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0169] In the battery 100, the battery cell 20 disposed in the box 10 may be one or more. When there are more than one battery cell 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then the whole may be accommodated in the box 10.

[0170] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0171] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a rectangular parallelepiped, a prism or other shapes. Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0172] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 This is a schematic diagram of the structure of the first electrode assembly 22 of the battery cell 20 provided in some embodiments of the present application. Figure 6 This is a schematic diagram of the structure of the second electrode assembly 23 of the battery cell 20 provided in some embodiments of the present application. Figure 7 A schematic diagram of the structure of a receiving piece 24 of a battery cell 20 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a shell 21, a first electrode assembly 22, a second electrode assembly 23 and a receiving piece 24. The shell 21 has a first wall 211. The first electrode assembly 22 and the second electrode assembly 23 are both contained in the shell 21 and arranged along the thickness direction X of the first wall, the second electrode assembly 23 is located between the first wall 211 and the first electrode assembly 22, and the first wall 211 is configured to support the second electrode assembly 23. The receiving piece 24 is disposed in the shell 21, and a receiving cavity 241 is formed inside the receiving piece 24, and the receiving cavity 241 receives the first electrode assembly 22 and the electrolyte.

[0173] The housing 21 can also be used to contain electrolyte. The housing 21 can also be made of a variety of materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0174] In some embodiments, the housing 21 may include a shell 212 and an end cap 213, the shell 212 has a accommodating space formed inside, the accommodating space is used to accommodate the first electrode assembly 22 and the second electrode assembly 23, and the accommodating space has a second opening 2121, that is, the shell 212 is a hollow structure with a second opening 2121 formed at one end, and the end cap 213 covers the second opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the first electrode assembly 22, the second electrode assembly 23 and the electrolyte.

[0175] When assembling the battery cell 20 , the first electrode assembly 22 and the second electrode assembly 23 may be placed in the shell 212 , and the shell 212 may be filled with electrolyte. The end cap 213 may then be covered on the second opening 2121 of the shell 212 to complete the assembly of the battery cell 20 .

[0176] The housing 212 may be in various shapes, such as a rectangular parallelepiped or a prism structure. Of course, the end cap 213 may also have various structures, such as a plate-like structure or a hollow structure with one end open. Figure 4 In the embodiment, the shell 212 is a rectangular parallelepiped structure, and the end cover 213 is a plate-like structure.

[0177] It should be noted that the first wall 211 for supporting the second electrode assembly 23 may be the end cover 213 of the housing 21 or a wall of the housing 212. Figure 3 and Figure 4 In the embodiment, the first wall 211 is a bottom wall of the shell 212 and the end cover 213, and correspondingly, the shell 21 further includes a second wall 214, which is arranged opposite to the first wall 211 in the thickness direction X of the first wall, that is, the second wall 214 is the end cover 213. Of course, in some embodiments, the first wall 211 may also be the end cover 213 of the shell 21 or a side wall of the shell 212 and the end cover 213 connected and adjacent to each other.

[0178] The first wall 211 is configured to support the second electrode assembly 23, that is, the gravity of the second electrode assembly 23 acts on the first wall 211, that is, the first electrode assembly 22, the second electrode assembly 23 and the first wall 211 are structures arranged along the direction of gravity, and the second electrode assembly 23 is placed on the first wall 211 along the direction of gravity.

[0179] Of course, it is understandable that the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures. For example, the outer shell 21 may include a shell body 212 and two end caps 213. The shell body 212 is a hollow structure with second openings 2121 on opposite sides. One end cap 213 corresponds to a second opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly and the electrolyte. That is, the shell body 212 is formed with second openings 2121 on opposite sides, and the two end caps 213 are respectively covered on both sides of the shell body 212 to close the corresponding second openings 2121.

[0180] The first electrode assembly 22 and the second electrode assembly 23 are components in the battery cell 20 where electrochemical reactions occur. The structure of the first electrode assembly 22 and the structure of the second electrode assembly 23 can be various. For example, the first electrode assembly 22 and the second electrode assembly 23 can be a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, a separator and a negative electrode sheet. Figure 4 In the figure, the first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding the positive electrode sheet, the isolation member and the negative electrode sheet, and the winding axes of the first electrode assembly 22 and the second electrode assembly 23 extend along the thickness direction X of the first wall, that is, the axial direction of the first electrode assembly 22 and the axial direction of the second electrode assembly 23 are consistent with the thickness direction X of the first wall.

[0181] Exemplarily, the isolation member is an isolation membrane, and the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0182] The first electrode assembly 22 and the second electrode assembly 23 are arranged along the thickness direction X of the first wall, and the second electrode assembly 23 is located between the first wall 211 and the first electrode assembly 22. That is, the first electrode assembly 22 and the second electrode assembly 23 are overlapping structures arranged along the thickness direction X of the first wall, and the first electrode assembly 22 is located on the side of the second electrode assembly 23 facing away from the first wall 211.

[0183] For example, in Figure 4 In the thickness direction X of the first wall, the battery cell 20 only includes one first electrode assembly 22 and one second electrode assembly 23 that are overlapped. Of course, in other embodiments, the battery cell 20 may also include multiple first electrode assemblies 22 that are overlapped on one side of the second electrode assembly 23 along the thickness direction X of the first wall, and every two adjacent first electrode assemblies 22 in the thickness direction X of the first wall are electrically connected to each other.

[0184] Optionally, in the thickness direction X of the first wall, the first electrode assembly 22 and the second electrode assembly 23 located at the same position may be one or multiple stacked along the thickness direction of the battery cell 20, that is, the battery cell 20 includes a group of first electrode assemblies 22 and a group of second electrode assemblies 23 stacked along the thickness direction X of the first wall, each group of first electrode assemblies 22 includes multiple first electrode assemblies 22 stacked along the thickness direction of the battery cell 20, and correspondingly, each group of second electrode assemblies 23 includes multiple second electrode assemblies 23 stacked along the thickness direction of the battery cell 20. The thickness direction of the battery cell 20 is perpendicular to the thickness direction X of the first wall, and the thickness direction of the battery cell 20 is the first direction Y.

[0185] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include two electrode terminals 25, both of which are insulated and installed on the outer shell 21, and both of which are used to be electrically connected to the first electrode assembly 22 or the second electrode assembly 23 to output or input electrical energy of the battery cell 20, and the two electrode terminals 25 are respectively used to output or input the positive and negative electrodes of the battery cell 20.

[0186] The electrode terminal 25 is insulated and mounted on the housing 21, that is, there is no electrical connection between the electrode terminal 25 and the housing 21. The electrode terminal 25 can be disposed on the end cap 213 of the housing 21, or on the shell 212 of the housing 21. Figure 3 and Figure 4 In the embodiment, the electrode terminal 25 is disposed on the end cover 213 .

[0187] Optionally, the electrode terminal 25 plays a role in outputting or inputting electric energy of the battery cell 20 , and the electrode terminal 25 may be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0188] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may further include a pressure relief mechanism 26 , which is disposed on the housing 21 and is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0189] Optionally, the pressure relief mechanism 26 may be disposed on the end cover 213 of the housing 21, or may be disposed on the shell 212 of the housing 21. Figure 3 and Figure 4 In the embodiment, the pressure relief mechanism 26 is disposed on the end cover 213 .

[0190] Similarly, the pressure relief mechanism 26 and the housing 21 may be an integrally formed structure or a separately arranged structure. Figure 4 In the embodiment, the pressure relief mechanism 26 and the housing 21 are of a separate structure, and the pressure relief mechanism 26 can be connected to the housing 21 by welding or the like, and correspondingly, the pressure relief mechanism 26 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve. Of course, in other embodiments, the pressure relief mechanism 26 and the housing 21 can also be an integrally formed structure, and the pressure relief mechanism 26 is an area on the housing 21 where a weak structure is formed, for example, an area on the housing 21 where a notch groove is provided.

[0191] A first electrode assembly 22 and a second electrode assembly 23 arranged along the thickness direction X of the first wall are provided in the outer shell 21, and the second electrode assembly 23 is located between the first wall 211 and the first electrode assembly 22, and the first wall 211 is used to support the second electrode assembly 23, so that the first electrode assembly 22 is a structure located on the upper side of the second electrode assembly 23, and a receiving piece 24 is provided in the outer shell 21, and a receiving cavity 241 for accommodating the first electrode assembly 22 and the electrolyte is formed inside the receiving piece 24, so that the first electrode assembly 22 is a structure accommodated inside the receiving piece 24, and the receiving piece 24 can also accommodate the electrolyte, so as to effectively alleviate the phenomenon that the electrolyte in the outer shell 21 sinks to the bottom along the thickness direction X of the first wall, and the electrolyte infiltration effect of the first electrode assembly 22 is poor, so that the first electrode assembly 22 located on the upper side of the second electrode assembly 23 can be fully infiltrated by the electrolyte accommodated in the receiving piece 24, which is beneficial to improve the infiltration effect of the first electrode assembly 22, so as to improve the performance of the battery cell 20.

[0192] According to some embodiments of the present application, referring to Figure 4 and Figure 7 , and please refer to 8 for further information. Figure 8 The structure of the receiving member 24 of the battery cell 20 provided in some embodiments of the present application is exploded. A first through hole 242 is provided on the outer peripheral surface of the receiving member 24, and the first through hole 242 is connected to the accommodating cavity 241. The first through hole 242 is located between the end surfaces of the two ends of the first electrode assembly 22 along the thickness direction X of the first wall.

[0193] The first through hole 242 is connected to the accommodating cavity 241 , that is, the first through hole 242 disposed on the outer peripheral surface of the receiving member 24 penetrates the cavity wall of the accommodating cavity 241 , so that the electrolyte in the receiving member 24 can overflow into the housing 21 through the first through hole 242 .

[0194] It should be noted that see Figure 4 and Figure 5As shown, the first electrode assembly 22 includes a first main body 221 and a first pole ear 222 and a third pole ear 223 connected to the first main body 221 at both ends in the thickness direction X of the first wall, so that the end surfaces of the first electrode assembly 22 at both ends in the thickness direction X of the first wall are respectively the end surfaces of the first main body 221 at both ends in the thickness direction X of the first wall, that is, along the thickness direction X of the first wall, the first through hole 242 is located between the end surfaces at both ends of the first electrode assembly 22, that is, the first through hole 242 is located between the two ends of the first main body 221 of the first electrode assembly 22 in the thickness direction X of the first wall, so that in the thickness direction X of the first wall, the two ends of the first main body 221 respectively exceed the first through hole 242, so that at least a portion of the first main body 221 of the first electrode assembly 22 can be immersed in the electrolyte in the accommodating cavity 241 of the receiving member 24. If the first body 221 of the first electrode assembly 22 is filled with the accommodating cavity 241 of the receiving member 24 , the projection of the first through hole 242 in the axial direction thereof is located in the first body 221 of the first electrode assembly 22 .

[0195] A first through hole 242 is provided on the outer peripheral surface of the receiving piece 24 to connect to the accommodating cavity 241 inside the receiving piece 24, and the first through hole 242 is located between the end surfaces of the first electrode assembly 22 at both ends in the thickness direction X of the first wall, so that part of the first electrode assembly 22 is located on the lower side of the first through hole 242 in the first direction Y, so that the electrolyte contained in the receiving piece 24 can effectively infiltrate the first electrode assembly 22, and the excess electrolyte in the accommodating cavity 241 of the receiving piece 24 can overflow out of the accommodating cavity 241 through the first through hole 242 to infiltrate the second electrode assembly 23 located outside the receiving piece 24, thereby improving the wetting effect of the electrolyte of the first electrode assembly 22 while also improving the utilization rate of the electrolyte and improving the wetting effect of the second electrode assembly 23.

[0196] It should be noted that the first through hole 242 disposed on the outer peripheral surface of the receiving member 24 may be one or more. In some embodiments, see Figure 7 and Figure 8 As shown, a plurality of first through holes 242 are disposed on the receiving member 24 , and the plurality of first through holes 242 are arranged at intervals along the circumference of the first electrode assembly 22 .

[0197] The plurality of first through holes 242 are arranged at intervals along the circumference of the first electrode assembly 22 , that is, the arrangement structure of the plurality of first through holes 242 is a structure that surrounds the receiving member 24 .

[0198] By providing a plurality of first through holes 242 on the receiving member 24, and the plurality of first through holes 242 are arranged at intervals along the circumference of the first electrode assembly 22, the efficiency of the electrolyte overflowing out of the accommodating cavity 241 can be improved, so that the excess electrolyte can quickly overflow out of the accommodating cavity 241 and contact with the second electrode assembly 23 and infiltrate the second electrode assembly 23.

[0199] According to some embodiments of the present application, referring to Figure 4 , Figure 7 and Figure 8 , and please refer to Fig. 9 , Fig. 9 Schematic diagram of the assembly of the first electrode assembly 22 and the first insulating member 27 of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 may further include the first insulating member 27, which is disposed between the first electrode assembly 22 and the receiving member 24, and the projection of the first through hole 242 in the axial direction thereof is located in the first insulating member 27.

[0200] The first insulating member 27 is disposed between the first electrode assembly 22 and the receiving member 24, that is, the first insulating member 27 is disposed on the outside of the first electrode assembly 22 and located on the inside of the receiving member 24. Fig. 9 In the embodiment, the first insulating member 27 is disposed on the outer side of the first body 221 of the first electrode assembly 22 .

[0201] The axial projection of the first through hole 242 is located inside the first insulating member 27 , that is, the first insulating member 27 covers the first through hole 242 in the axial direction, so that only the first insulating member 27 can be contacted through the first through hole 242 , and the first electrode assembly 22 cannot be directly contacted.

[0202] The first insulating member 27 serves to insulate and isolate the first electrode assembly 22 from other components. The first insulating member 27 may be made of a variety of materials, such as plastic, rubber, or silicone.

[0203] It should be noted that the first insulating member 27 can be assembled between the first electrode assembly 22 and the receiving member 24 in various structures. For example, the first insulating member 27 can be a structure bonded to the outer side of the first main body 221 of the first electrode assembly 22, or a structure wrapped around the outer peripheral side of the first main body 221 of the first electrode assembly 22. Of course, the first insulating member 27 can also be a structure connected to the inner surface of the receiving member 24.

[0204] By setting the first insulating member 27 between the first electrode assembly 22 and the receiving member 24, and the axial projection of the first through hole 242 is located within the first insulating member 27, the first insulating member 27 can play a certain shielding role on the area of ​​the first electrode assembly 22 corresponding to the first through hole 242, so as to reduce the risk of short-circuiting other components with the first electrode assembly 22 after passing through the first through hole 242, thereby helping to improve the reliability of the battery cell 20.

[0205] In some embodiments, see Fig. 9 As shown, the first insulating member 27 is disposed around the first electrode assembly 22 around an axis extending along the thickness direction X of the first wall. That is, the first insulating member 27 is an annular structure disposed around the first electrode assembly 22 along the circumference of the first electrode assembly 22, so that the first insulating member 27 is disposed around the first electrode assembly 22.

[0206] Exemplarily, the first insulating member 27 surrounds the outer side of the first body 221 of the first electrode assembly 22 around an axis extending along the thickness direction X of the first wall.

[0207] By configuring the first insulating member 27 as a structure surrounding the outer side of the first electrode assembly 22, on the one hand, the structural stability of the first insulating member 27 assembled between the first electrode assembly 22 and the receiving member 24 can be improved, which is beneficial to reduce the risk of the first insulating member 27 falling off during use; on the other hand, the shielding effect of the first insulating member 27 on the area of ​​the first electrode assembly 22 corresponding to the first through hole 242 can be further improved, so as to further reduce the risk of short-circuiting other components with the first electrode assembly 22 after passing through the first through hole 242.

[0208] In some embodiments, please see Fig. 9 As shown, the first insulating member 27 is bonded to the first electrode assembly 22 .

[0209] Exemplarily, the structure of the first insulating member 27 can be various. For example, the first insulating member 27 can be an insulating paper or insulating tape bonded to the first electrode assembly 22. Of course, the first insulating member 27 can also be an insulating film with an adhesive layer provided on the side facing the first electrode assembly 22. The adhesive layer can be glue or double-sided tape, and the material of the insulating film can be rubber, silicone or plastic.

[0210] By configuring the first insulating member 27 to be bonded to the outer side of the first electrode assembly 22, the structural stability of the first insulating member 27 disposed on the first electrode assembly 22 can be further improved, and the difficulty of assembling the first insulating member 27 between the first electrode assembly 22 and the receiving member 24 can be reduced, which is beneficial to improving the assembly efficiency of the battery cell 20.

[0211] According to some embodiments of the present application, see Figure 3 and Figure 4 Along the thickness direction X of the first wall, the housing 21 has a second wall 214 arranged opposite to the first wall 211 , and a liquid injection hole 2141 is arranged on the second wall 214 , and the liquid injection hole 2141 is communicated with the accommodating cavity 241 .

[0212] Among them, the shell 21 has a second wall 214 arranged opposite to the first wall 211, that is, the shell 21 also has a second wall 214, and the second wall 214 and the first wall 211 are arranged opposite to each other in the thickness direction X of the first wall, that is, the first wall 211 and the second wall 214 are respectively the end walls of the shell 21 at both ends in the thickness direction X of the first wall.

[0213] The second wall 214 is provided with an injection hole 2141 for primary or secondary injection into the housing 21. The injection hole 2141 is connected to the accommodating cavity 241, so that the through-hole injection hole 2141 can directly inject the electrolyte into the accommodating cavity 241 of the receiving member 24 to infiltrate the first electrode assembly 22. It should be noted that in the embodiment in which the first through hole 242 is provided on the receiving member 24, after the electrolyte is injected into the accommodating cavity 241 of the receiving member 24 through the injection hole 2141, the excess electrolyte can also overflow through the first through hole 242 to infiltrate the second electrode assembly 23, so that there is no need to open other injection holes 2141 on the housing 21. Of course, in the embodiment in which the first through hole 242 is not provided on the receiving member 24, it is necessary to provide a second injection hole 2141 on the other wall of the housing 21 to facilitate the injection of electrolyte into the housing 21, so as to infiltrate the second electrode assembly 23.

[0214] It should be noted that there may be various structures for the interconnection between the injection hole 2141 and the accommodating cavity 241 of the receiving component 24. The receiving component 24 may have a first opening 243 formed at one end close to the first wall 211 in the thickness direction X of the first wall, and the first opening 243 is directly connected to the injection hole 2141. The injection hole 2141 may be connected to the accommodating cavity 241 of the receiving component 24 through other connecting parts, that is, one end of the connecting part is connected to the injection hole 2141, and the other end extends into the accommodating cavity 241 of the receiving component 24.

[0215] By setting an injection hole 2141 on the second wall 214 of the outer shell 21, and the injection hole 2141 is connected to the accommodating cavity 241 of the receiving component 24, the electrolyte can be directly injected into the accommodating cavity 241 of the receiving component 24 through the injection hole 2141, without the need to first assemble the electrolyte into the receiving component 24 and then assemble the receiving component 24 into the outer shell 21, which is beneficial to optimizing the assembly process of the battery cell 20 and can reduce the difficulty of assembling the electrolyte into the accommodating cavity 241 of the receiving component 24, so as to improve the production efficiency of the battery cell 20. In addition, in an embodiment in which a first through hole 242 is provided on the outer peripheral surface of the receiving piece 24, after the battery cell 20 adopting this structure can directly inject electrolyte into the accommodating cavity 241 of the receiving piece 24 through the injection hole 2141, the electrolyte can also overflow into the outer shell 21 through the first through hole 242 to infiltrate the second electrode assembly 23, thereby eliminating the need to separately open the injection hole 2141 for the second electrode assembly 23, and thus the effect of infiltrating the first electrode assembly 22 and the second electrode assembly 23 can be achieved through a single injection. The operation is simple, and the difficulty of assembling the battery cell 20 can be effectively reduced, and the production rhythm of the battery cell 20 can be optimized.

[0216] According to some embodiments of the present application, referring to Figure 3 and Figure 4 , and please refer to Fig.10 , Fig.10 Schematic diagram of assembly of the receiving member 24 and the second insulating member 28 of the battery cell 20 provided in some embodiments of the present application. Along the thickness direction X of the first wall, the housing 21 has a second wall 214 arranged opposite to the first wall 211. The battery cell 20 may also include a second insulating member 28, which is arranged on the side of the second wall 214 facing the first electrode assembly 22, and the second insulating member 28 is configured to insulate and isolate the second wall 214 and the first electrode assembly 22, and the receiving member 24 is connected to the second insulating member 28 at one end facing the second wall 214 in the thickness direction X of the first wall.

[0217] Among them, the second insulating member 28 is arranged in the shell 21 and is located between the second wall 214 and the first electrode assembly 22, so that the second insulating member 28 plays the role of insulating and isolating the second wall 214 and the first electrode assembly 22. The material of the second insulating member 28 can be various, such as rubber, silicone or plastic.

[0218] The end of the receiving member 24 facing the second wall 214 in the thickness direction X of the first wall is connected to the second insulating member 28, that is, the end of the receiving member 24 away from the second electrode assembly 23 in the thickness direction X of the first wall is connected to the second insulating member 28. The connection structure between the receiving member 24 and the second insulating member 28 can be various, such as hot melt connection or bonding. It should be noted that in the embodiment where the first opening 243 is formed at the end of the receiving member 24 close to the second wall 214 and the first opening 243 is connected to the injection hole 2141, the end of the receiving member 24 provided with the first opening 243 is connected to the second insulating member 28.

[0219] A second insulating member 28 is also provided in the housing 21 of the battery cell 20, and the second insulating member 28 is provided between the second wall 214 and the first electrode assembly 22, so that the second insulating member 28 can insulate and isolate the first electrode assembly 22 and the second wall 214, so as to reduce the risk of short circuit between the first electrode assembly 22 and the second wall 214. In addition, by connecting the end of the receiving member 24 close to the second wall 214 in the thickness direction X of the first wall to the second insulating member 28, it is helpful to further improve the structural stability of the receiving member 24 assembled in the housing 21, so as to reduce the shaking of the receiving member 24 during use, and can alleviate the phenomenon that the overall gravity of the receiving member 24 and the first electrode assembly 22 acts on the second electrode assembly 23.

[0220] In some embodiments, the receiving member 24 is connected to the second insulating member 28 by thermal melting.

[0221] By setting a structure between the receiving part 24 and the second insulating part 28 to be connected by hot melt, the receiving part 24 can be connected to the second insulating part 28. The structure is simple, the connection stability is high, and it is beneficial to improve the sealing effect after the receiving part 24 and the second insulating part 28 are connected to each other.

[0222] In some embodiments, the accommodating cavity 241 is formed with a first opening 243 at one end of the accommodating cavity 241 close to the second wall 214 in the thickness direction X of the first wall, and the second insulating member 28 closes the first opening 243 .

[0223] The first opening 243 serves to communicate with the injection hole 2141 , and the first opening 243 is provided at one end of the receiving member 24 , so as to facilitate the assembly of the first electrode assembly 22 into the accommodating cavity 241 of the receiving member 24 .

[0224] The accommodating cavity 241 of the receiving piece 24 is formed with a first opening 243 at one end close to the second wall 214 in the thickness direction X of the first wall, and the first opening 243 is closed by the third insulating piece 33, so as to facilitate the injection of electrolyte into the accommodating cavity 241 through the first opening 243, and the first opening 243 of the receiving piece 24 can be closed by the second insulating piece 28, and there is no need to design a separate sealing process for the first opening 243 of the receiving piece 24, which is beneficial to optimizing the production rhythm of the battery cell 20.

[0225] According to some embodiments of the present application, see Figure 4 , Figure 7 and Figure 8 As shown, the receiving member 24 may include two diaphragms 244, the two diaphragms 244 are arranged along the first direction Y, and the two diaphragms 244 are enclosed together to form a receiving cavity 241. The diaphragm 244 forms a first connection area 2441 at one end close to the first wall 211 in the thickness direction X of the first wall, the first connection areas 2441 of the two diaphragms 244 are stacked and connected, and two second connection areas 2442 are formed at both ends of the diaphragm 244 in the second direction Z, respectively, and the second connection areas 2442 of the two diaphragms 244 are stacked and connected accordingly, and the thickness direction X of the first wall, the first direction Y, and the second direction Z are perpendicular to each other.

[0226] The first direction Y is the thickness direction of the battery cell 20 , the thickness direction of the membrane 244 , and the stacking direction of the first connection areas 2441 of the two membranes 244 or the stacking direction of the second connection areas 2442 of the two membranes 244 .

[0227] The receiving member 24 includes two diaphragms 244 , which together enclose a receiving cavity 241 , that is, the first electrode assembly 22 is disposed between the two diaphragms 244 , and the two diaphragms 244 cooperate to cover the outer side of the first electrode assembly 22 .

[0228] Optionally, the structures of the two diaphragms 244 can be various, for example, Figure 8 In the embodiment, the two diaphragms 244 are two independently arranged parts, and the two diaphragms 244 are arranged along the first direction Y and connected to each other to form the accommodating cavity 241. Of course, in other embodiments, the two diaphragms 244 can also be two diaphragm 244 structures formed by folding one part in half, so that the two diaphragms 244 are arranged along the first direction Y. Of course, in other embodiments, the receiving member 24 can also be other structures, for example, the receiving member 24 is an integrated structure made by an integrated molding process such as injection molding or inflation molding, that is, the receiving member 24 is a hollow structure with one end open. In this embodiment, the receiving member 24 may not be provided with the first connection area 2441 and the second connection area 2442.

[0229] The diaphragm 244 forms a first connection area 2441 at one end of the first wall 211 in the thickness direction X of the first wall, and the first connection areas 2441 of the two diaphragms 244 are stacked and connected. That is, the diaphragm 244 forms a first connection area 2441 at the edge area of ​​one end of the second electrode assembly 23 in the thickness direction X of the first wall. The first connection areas 2441 of the two diaphragms 244 are stacked and connected to each other along the first direction Y, so that the opening of the receiving piece 24 at one end of the receiving piece 24 in the thickness direction X of the first wall near the second electrode assembly 23 can be sealed. Correspondingly, the edges of the two diaphragms 244 at one end away from the second electrode assembly 23 in the thickness direction X of the first wall are not connected to each other, thereby enclosing the first opening 243 of the receiving piece 24.

[0230] Two second connection areas 2442 are respectively formed at the two ends of the diaphragm 244 in the second direction Z. The second connection areas 2442 of the two diaphragms 244 are correspondingly stacked and connected. That is, two second connection areas 2442 are respectively formed at the edge areas of the two ends of the diaphragm 244 in the second direction Z. The second connection areas 2442 of the two diaphragms 244 are correspondingly stacked and connected to each other along the first direction Y, so that the openings of the receiving piece 24 at both ends in the second direction Z can be sealed, thereby enabling the receiving piece 24 to be a hollow structure with a first opening 243 formed at one end in the thickness direction X of the first wall.

[0231] The receiving member 24 is provided with two diaphragms 244 arranged in the first direction Y. The first connection areas 2441 of the two diaphragms 244 are stacked and connected to each other, and the second connection areas 2442 of the two ends of the two diaphragms 244 in the second direction Z are stacked and connected to each other, so that the two diaphragms 244 are connected to each other to jointly enclose a receiving cavity 241 for accommodating the first electrode assembly 22 and the electrolyte. The structure is simple and easy to implement.

[0232] In some embodiments, the first connection area 2441 of the two membranes 244 is connected by heat fusion, and the second connection area 2442 of the two membranes 244 is connected by heat fusion.

[0233] It should be noted that, in other embodiments, the first connection areas 2441 of the two membranes 244 may also be connected to each other by bonding or the like, for example, a bonding layer such as glue or double-sided tape is provided between the first connection areas 2441 of the two membranes 244, so that the first connection areas 2441 of the two membranes 244 can be bonded to each other. Similarly, the second connection areas 2442 of the two membranes 244 may also be connected to each other by bonding or the like, for example, a bonding layer such as glue or double-sided tape is provided between the second connection areas 2442 of the two membranes 244, so that the second connection areas 2442 of the two membranes 244 can be bonded to each other.

[0234] The first connection areas 2441 of the two membranes 244 are connected to each other through a hot melt connection structure, which has a simple structure, high stability, and is conducive to improving the sealing effect after the two first connection areas 2441 are connected to each other. Similarly, the second connection areas 2442 of the two membranes 244 are connected to each other through a hot melt connection structure, which has a simple structure, high stability, and is conducive to improving the sealing effect after the two second connection areas 2442 are connected to each other.

[0235] According to some embodiments of the present application, referring to Figure 4 , Figure 5 , Figure 6 and Fig.10 , and please refer to Fig.11 and Fig.12 , Fig.11 A schematic diagram of the structure of a mounting frame 29 of a battery cell 20 provided in some embodiments of the present application, Fig.12 A front view of a mounting frame 29 of a battery cell 20 provided in some embodiments of the present application in a second direction Z. The first electrode assembly 22 includes a first body 221 and a first pole ear 222 connected to each other, and the second electrode assembly 23 includes a second body 231 and a second pole ear 232 connected to each other. The second body 231 and the first body 221 are arranged along the thickness direction X of the first wall, and the first pole ear 222 is electrically connected to the second pole ear 232 to electrically connect the first electrode assembly 22 and the second electrode assembly 23. The battery cell 20 may also include a mounting frame 29, which is accommodated in the housing 21 and located outside the receiving member 24. The mounting frame 29 is arranged between the first body 221 and the second body 231 along the thickness direction X of the first wall, and the mounting frame 29 is configured to separate the first body 221 and the second body 231. The mounting frame 29 is provided with an avoidance groove 291 on one side facing the first body 221 in the thickness direction X of the first wall, and the avoidance groove 291 is used to accommodate the first connection area 2441 of the two diaphragms 244.

[0236] Among them, the first main body 221 of the first electrode assembly 22 is the area where chemical reactions occur in the battery cell 20. The first main body 221 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the isolation member and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet of opposite polarities.

[0237] The first pole ear 222 is a positive electrode or a negative electrode for electrically connecting to the second pole ear 232 of the second electrode assembly 23. If the first pole ear 222 is used to input or output the positive electrode of the first electrode assembly 22, the first pole ear 222 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the first pole ear 222 is used to output or input the negative electrode of the first electrode assembly 22, the first pole ear 222 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. Each first electrode assembly 22 has two first pole ears 222, and the two first pole ears 222 are both connected to one end of the first body 221 facing the second electrode assembly 23 in the thickness direction X of the first wall, and the polarities of the two first pole ears 222 are different, that is, the two first pole ears 222 of each first electrode assembly 22 are respectively a positive electrode and a negative electrode for electrically connecting to the second pole ear 232 of the second electrode assembly 23.

[0238] Similarly, the second main body 231 of the second electrode assembly 23 is the area where the chemical reaction occurs in the second electrode assembly 23 within the battery cell 20. The second main body 231 is a structure formed by winding the area of ​​the positive electrode sheet coated with the positive electrode active material layer, the isolation member and the area of ​​the negative electrode sheet coated with the negative electrode active material layer. It mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet of opposite polarities.

[0239] The second pole ear 232 is a positive electrode or a negative electrode for electrically connecting to the first pole ear 222 of the first electrode assembly 22. If the second pole ear 232 is used to input or output the positive electrode of the second electrode assembly 23, the second pole ear 232 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the second pole ear 232 is used to output or input the negative electrode of the second electrode assembly 23, the second pole ear 232 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. Each second electrode assembly 23 has two second pole ears 232, and the two second pole ears 232 are both connected to one end of the second body 231 facing the first electrode assembly 22 in the thickness direction X of the first wall. The polarities of the two second pole ears 232 are different, that is, the two second pole ears 232 of each second electrode assembly 23 are respectively a positive electrode and a negative electrode for electrically connecting to the first pole ear 222 of the first electrode assembly 22.

[0240] exist Figure 4 and Figure 5 In the embodiment, the first electrode assembly 22 may further include a third pole ear 223, which is connected to an end of the first body 221 away from the first pole ear 222 in the thickness direction X of the first wall, and the third pole ear 223 is located at an end of the first body 221 facing the electrode terminal 25, and the third pole ear 223 is used to be electrically connected to the electrode terminal 25 to output or input electrical energy between the first electrode assembly 22 and the second electrode assembly 23.

[0241] The third pole tab 223 is used to output or input the positive electrode or negative electrode of the first electrode assembly 22. If the third pole tab 223 is used to input or output the positive electrode of the first electrode assembly 22, the third pole tab 223 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the third pole tab 223 is used to output or input the negative electrode of the first electrode assembly 22, the third pole tab 223 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. Each first electrode assembly 22 has two third pole tabs 223, and the two third pole tabs 223 are both connected to one end of the first body 221 facing the electrode terminal 25 in the thickness direction X of the first wall. The polarities of the two third pole tabs 223 are different, and the two third pole tabs 223 are respectively connected to the two electrode terminals 25, that is, the two third pole tabs 223 of each first electrode assembly 22 are respectively used to output the positive electrode and the negative electrode of the first electrode assembly 22.

[0242] The mounting frame 29 is installed between the first body 221 and the second body 231 to separate and support the first body 221 and the second body 231 . The mounting frame 29 can be made of various materials, such as rubber, silicone or plastic.

[0243] For example, in Fig.10 In the figure, the first body 221 of the first electrode assembly 22 is assembled in the receiving piece 24, so that the end of the first body 221 close to the second body 231 in the thickness direction X of the first wall is indirectly abutted against the mounting frame 29 through the receiving piece 24, and the end of the second body 231 close to the first body 221 in the thickness direction X of the first wall is abutted against the mounting frame 29.

[0244] The mounting frame 29 is provided with an avoidance groove 291 on the side facing the first main body 221 in the thickness direction X of the first wall, and the avoidance groove 291 is used to accommodate the first connection areas 2441 of the two diaphragms 244. That is, the first connection areas 2441 of the two diaphragms 244 are stacked and connected with each other and then inserted into the avoidance groove 291, so that the first connection areas 2441 and the mounting frame 29 share part of the space in the thickness direction X of the first wall.

[0245] By arranging the mounting frame 29 between the first body 221 and the second body 231 arranged along the thickness direction X of the first wall, the mounting frame 29 can separate the first body 221 and the second body 231. On the one hand, the mounting frame 29 can play a role in assembling the first body 221 and the second body 231 firmly, which is conducive to reducing the stability of the first electrode assembly 22 and the second electrode assembly 23 assembled into the housing 21. On the other hand, it can reduce the phenomenon of the first body 221 and the second body 231 colliding with each other during use. In addition, by arranging the avoidance groove 291 for accommodating the first connection area 2441 of the two diaphragms 244 on the side of the mounting frame 29 facing the first body 221, the avoidance groove 291 of the mounting frame 29 can avoid the first connection area 2441 of the two diaphragms 244, which is conducive to reducing the interference between the mounting frame 29 and the first connection area 2441 of the diaphragm 244, and can improve the internal space utilization rate of the battery cell 20.

[0246] In some embodiments, the receiving member 24 is made of insulating material.

[0247] Exemplarily, the material of the receiving member 24 may be rubber, silicone or plastic.

[0248] By setting the receiving piece 24 to be an insulating material, the first electrode assembly 22 accommodated in the accommodating cavity 241 of the receiving piece 24 can also be insulated and isolated from the outer shell 21 or other components through the receiving piece 24, which is beneficial to reduce the risk of short circuit between the first electrode assembly 22 and the outer shell 21 or other components.

[0249] According to some embodiments of the present application, see Figure 4 As shown, the first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding around an axis extending along the thickness direction X of the first wall.

[0250] The first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding around an axis extending along the thickness direction X of the first wall, that is, the first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding the positive electrode sheet, the separator and the negative electrode sheet, and the winding center axis of the first electrode assembly 22 and the winding center axis of the second electrode assembly 23 both extend along the thickness direction X of the first wall, that is, the axial direction of the first electrode assembly 22 and the axial direction of the second electrode assembly 23 are consistent with the thickness direction X of the first wall. The first electrode assembly 22 and the second electrode assembly 23 are structures that overlap along the axial direction of the first electrode assembly 22 or the axial direction of the second electrode assembly 23.

[0251] By setting the first electrode assembly 22 and the second electrode assembly 23 to be a winding structure formed by winding around an axis extending along the thickness direction X of the first wall, the first electrode assembly 22 and the second electrode assembly 23 are structures arranged in the outer shell 21 along their axial direction. The battery cell 20 adopting this structure can increase the length dimension of the battery cell 20 in the thickness direction X of the first wall while optimizing the dimension of the single electrode assembly accommodated in the outer shell 21 in the thickness direction X of the first wall. There is no need to increase the winding dimension of the first electrode assembly 22 or the second electrode assembly 23 in the thickness direction X of the first wall, thereby effectively reducing the difficulty of winding the first electrode assembly 22 and the second electrode assembly 23, and reducing the difficulty of assembling the battery cell 20, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0252] According to some embodiments of the present application, see Figure 3 As shown, the length direction of the shell 21 is consistent with the thickness direction X of the first wall, and the length of the shell 21 is L, satisfying that L≥200 mm.

[0253] The thickness direction X of the first wall is the length direction of the housing 21 , and is also the height direction of the battery cell 20 .

[0254] By setting the length of the outer shell 21 to be greater than or equal to 200 mm, the length dimension of the battery cell 20 in the thickness direction X of the first wall is increased, and while realizing the battery cell 20 to be of a larger length, the first electrode assembly 22 and the second electrode assembly 23 in the outer shell 21 are set to be arranged along the thickness direction X of the first wall, so that while realizing the length of the outer shell 21 of the battery cell 20 in the thickness direction X of the first wall to be greater than or equal to 200 mm, the dimension of the single electrode assembly accommodated in the outer shell 21 in the thickness direction X of the first wall can be optimized, and there is no need to increase the winding dimension of the first electrode assembly 22 or the second electrode assembly 23 in the thickness direction X of the first wall, so as to reduce the difficulty of winding the first electrode assembly 22 and the second electrode assembly 23, and can reduce the difficulty of assembling the battery cell 20, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0255] In some embodiments, please see Figure 3 As shown, the length direction of the shell 21 is consistent with the thickness direction X of the first wall, and the length of the shell 21 is L, satisfying that L≥250mm.

[0256] By further setting the length of the outer shell 21 to be greater than or equal to 250 mm, the length dimension of the battery cell 20 in the thickness direction X of the first wall can be further increased, so that while the length of the outer shell 21 of the battery cell 20 in the thickness direction X of the first wall is greater than or equal to 250 mm, the dimension of the single electrode assembly accommodated in the outer shell 21 in the thickness direction X of the first wall can be optimized. There is no need to increase the winding dimension of the first electrode assembly 22 or the second electrode assembly 23 in the thickness direction X of the first wall to reduce the difficulty of winding the first electrode assembly 22 and the second electrode assembly 23, and the difficulty of assembling the battery cell 20 can be reduced, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0257] According to some embodiments of the present application, the first electrode assembly 22 is electrically connected to the second electrode assembly 23. That is, the first electrode assembly 22 and the second electrode assembly 23 are electrically connected. Optionally, the first electrode assembly 22 and the second electrode assembly 23 may be connected in parallel or in series.

[0258] By setting the first electrode assembly 22 and the second electrode assembly 23 to be electrically connected to each other, the first electrode assembly 22 and the second electrode assembly 23 are connected in parallel or in series inside the outer shell 21, so that only two electrode output terminals need to be set on the outer shell 21 to realize the input or output of the positive and negative electrodes of the battery cell 20, thereby reducing the production cost of the battery cell 20 and optimizing the production rhythm of the battery cell 20 to improve the production efficiency of the battery cell 20.

[0259] In some embodiments, reference Figure 5 and Figure 6 , and please refer to Fig.13 , Fig.13 A schematic diagram of the connection between the first electrode assembly 22 and the second electrode assembly 23 of the battery cell 20 provided in some embodiments of the present application. The first electrode assembly 22 includes a first body 221 and a first pole tab 222, and the second electrode assembly 23 includes a second body 231 and a second pole tab 232. The second body 231 and the first body 221 are arranged along the thickness direction X of the first wall. Along the thickness direction X of the first wall, the first pole tab 222 is arranged at one end of the first body 221 facing the second body 231, and the second pole tab 232 is arranged at one end of the second body 231 facing the first body 221, and the second pole tab 232 is connected to the first pole tab 222 to electrically connect the first electrode assembly 22 and the second electrode assembly 23.

[0260] Each first electrode assembly 22 has two first pole tabs 222, and the two first pole tabs 222 are connected to one end of the first body 221 facing the second electrode assembly 23 in the thickness direction X of the first wall, and the polarities of the two first pole tabs 222 are different. Each second electrode assembly 23 has two second pole tabs 232, and the two second pole tabs 232 are connected to one end of the second body 231 facing the first electrode assembly 22 in the thickness direction X of the first wall, and the polarities of the two second pole tabs 232 are different.

[0261] The two first pole ears 222 of the first electrode assembly 22 and the two second pole ears 232 of the second electrode assembly 23 can be the first pole ears 222 and the second pole ears 232 of the same polarity connected correspondingly to achieve a parallel connection between the first electrode assembly 22 and the second electrode assembly 23, or the first pole ears 222 and the second pole ears 232 of opposite polarities can be connected correspondingly to achieve a series connection between the first electrode assembly 22 and the second electrode assembly 23.

[0262] By arranging the first main body 221 of the first electrode assembly 22 and the second main body 231 of the second electrode assembly 23 to be arranged along the first direction Y, and the first pole ear 222 of the first electrode assembly 22 is arranged at one end of the first main body 221 facing the second main body 231, and correspondingly, the second pole ear 232 of the second electrode assembly 23 is arranged at one end of the second main body 231 facing the first main body 221, so that the first pole ear 222 is connected to the second pole ear 232, the electrical connection between the first electrode assembly 22 and the second electrode assembly 23 can be achieved. The battery cell 20 adopting this structure is convenient for achieving the electrical connection between the first electrode assembly 22 and the second electrode assembly 23, which is beneficial to reducing the difficulty of mutual electrical connection between the first electrode assembly 22 and the second electrode assembly 23, so as to improve the assembly efficiency of the battery cell 20.

[0263] According to some embodiments of the present application, see Figure 4 and Fig.13 As shown, the battery cell 20 may further include an adapter 30. The adapter 30 connects the first pole ear 222 and the second pole ear 232, the first pole ear 222 is located in the accommodating cavity 241, and the second pole ear 232 is located outside the receiving member 24, and the receiving member 24 is provided with a channel for the adapter 30 to pass through at one end close to the second body 231 in the thickness direction X of the first wall.

[0264] The first pole tab 222 is located in the accommodating cavity 241 , and the second pole tab 232 is located outside the receiving member 24 , that is, the first pole tab 222 and the second pole tab 232 are located at the inner side and the outer side of the receiving member 24 , respectively.

[0265] The receiving component 24 is provided with a channel for the adapter 30 to pass through at one end close to the second main body 231 in the thickness direction X of the first wall, that is, the adapter 30 passes through the accommodating cavity 241 of the receiving component 24 and passes through the end of the receiving component 24 close to the second main body 231 in the thickness direction X of the first wall. In other words, after the adapter 30 passes through the channel of the receiving component 24, part of the adapter 30 is located on the inner side of the receiving component 24 so that the adapter 30 can be connected to the first pole ear 222, and part of the adapter 30 is located on the outer side of the receiving component 24 so that the adapter 30 can be connected to the second pole ear 232.

[0266] exist Figure 4 In the embodiment, each first electrode assembly 22 has two first pole ears 222 , and each second electrode assembly 23 has two second pole ears 232 , each first pole ear 222 is connected to a second pole ear 232 , and correspondingly, the battery cell 20 includes two adapters 30 , each adapter 30 is connected to a first pole ear 222 and a second pole ear 232 .

[0267] The housing 21 of the battery cell 20 is also provided with an adapter 30. By passing the adapter 30 through the channel at one end of the receiving member 24 in the thickness direction X of the first wall close to the second body 231, the adapter 30 can connect the first pole ear 222 of the first electrode assembly 22 located inside the receiving member 24 and the second pole ear 232 of the second electrode assembly 23 located outside the receiving member 24, so as to realize the connection between the first pole ear 222 and the second pole ear 232. The battery cell 20 with this structure does not need to connect the first pole ear 22 of the first electrode assembly 22. A pole ear 222 is configured to pass through the receiving piece 24, and there is no need to configure the second pole ear 232 of the second electrode assembly 23 to be a structure inserted into the accommodating cavity 241 of the receiving piece 24. Therefore, by configuring the adapter 30 to pass through the receiving piece 24 and then connect the first pole ear 222 and the second pole ear 232, the difficulty of connecting the first pole ear 222 and the second pole ear 232 to each other can be reduced, and the adapter 30 is easier to pass through the channel of the receiving piece 24 than the first pole ear 222, which helps to reduce the difficulty of assembling the battery cell 20.

[0268] According to some embodiments of the present application, referring to Figure 4 and Fig.13 , and please refer to Fig.14 , Fig.14 Schematic diagram of the connection between the adapter 30 and the seal 31 of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 may also include a seal 31, which is disposed between the adapter 30 and the receiving member 24, and is configured to seal the gap between the adapter 30 and the receiving member 24.

[0269] Among them, the seal 31 is arranged between the adapter 30 and the receiving part 24, that is, the seal 31 is arranged between the outer peripheral surface of the adapter 30 and the inner wall surface of the channel of the receiving part 24, so that the seal 31 can seal the gap between the adapter 30 and the inner wall surface of the channel of the receiving part 24.

[0270] Optionally, the sealing member 31 may be of various structures, and the sealing member 31 may be a double-sided adhesive, hot melt adhesive or sealant, etc., which is arranged between the adapter 30 and the receiving member 24 .

[0271] By providing a seal 31 between the adapter 30 and the receiving piece 24, the seal 31 can seal the gap between the adapter 30 and the receiving piece 24, so that after the adapter 30 passes through the receiving piece 24, the sealing between the adapter 30 and the receiving piece 24 can be improved to reduce the leakage of electrolyte from the channel of the receiving piece 24, thereby ensuring that there is enough electrolyte in the accommodating cavity 241 of the receiving piece 24 for the first electrode assembly 22 to be infiltrated.

[0272] In some embodiments, see Figure 7 and Figure 8 As shown, the receiving member 24 may include two diaphragms 244. The two diaphragms 244 are arranged along the first direction Y, and the two diaphragms 244 together enclose a receiving cavity 241. The diaphragm 244 forms a first connection area 2441 at one end close to the first wall 211 in the thickness direction X of the first wall. The first connection areas 2441 of the two diaphragms 244 are stacked and connected, and a channel is formed between the first connection areas 2441 of the two diaphragms 244.

[0273] Among them, the first connection areas 2441 of the two diaphragms 244 are stacked and connected, and a channel is formed between the first connection areas 2441 of the two diaphragms 244, that is, the areas where the first connection areas 2441 of the two diaphragms 244 are not connected to each other are jointly enclosed to form a channel for the adapter 30 to pass through, so that the adapter 30 is arranged in the areas where the first connection areas 2441 of the two diaphragms 244 are not connected to each other, that is, the adapter 30 is clamped between the first connection areas 2441 of the two diaphragms 244, and the areas where the first connection areas 2441 of the two diaphragms 244 do not clamp the adapter 30 are connected to each other.

[0274] It should be noted that, in the embodiment in which a sealing member 31 is disposed between the adapter 30 and the receiving member 24 , the sealing member 31 is disposed between the adapter 30 and the first connecting area 2441 .

[0275] It should be noted that in the structure in which the receiving component 24 is integrally formed, the channel is a hole opened on one end of the receiving component 24 close to the second electrode assembly 23 in the thickness direction X of the first wall, and the hole is connected to the accommodating cavity 241, so that the adapter 30 can pass through the accommodating cavity 241 of the receiving component 24 to the outside of the receiving component 24.

[0276] The receiving piece 24 is provided with two diaphragms 244 arranged in the first direction Y, and the channel for the adapter 30 to pass through is formed by the first connection areas 2441 of the two diaphragms 244 being stacked and enclosed together, so that the adapter 30 is a structure clamped by the first connection areas 2441 of the two first diaphragms 244, so that the adapter 30 can pass through the first connection areas 2441 of the two diaphragms 244, thereby eliminating the need to separately open a channel on the receiving piece 24 for the adapter 30 to pass through, which is beneficial to reducing the manufacturing difficulty of the receiving piece 24, and after the adapter 30 passes through the channel, it is convenient to stack the first connection areas 2441 of the two diaphragms 244 and the adapter 30 and connect them into one, which is beneficial to improving the stability of the adapter 30 passing through the channel.

[0277] According to some embodiments of the present application, referring to Figure 4 , Fig.10 and Fig.11 , and please refer to Fig.15 , Fig.15 A bottom view of a mounting frame 29 of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 may further include a mounting frame 29, which is accommodated in the housing 21 and located outside the receiving member 24. The mounting frame 29 is disposed between the first body 221 and the second body 231 along the thickness direction X of the first wall, and the mounting frame 29 is configured to separate the first body 221 and the second body 231. The mounting frame 29 is provided with an avoidance hole 292, which passes through the mounting frame 29 along the thickness direction X of the first wall, and the adapter 30 and the second pole ear 232 are both inserted into the avoidance hole 292.

[0278] The avoidance hole 292 penetrates the mounting frame 29 along the thickness direction X of the first wall, that is, the mounting hole is a structure extending along the thickness direction X of the first wall, and the mounting hole penetrates the surfaces of the mounting frame 29 on both sides in the thickness direction X of the first wall.

[0279] The adapter 30 and the second pole ear 232 are both inserted into the avoidance hole 292, that is, at least a portion of the adapter 30 and at least a portion of the second pole ear 232 are accommodated in the avoidance hole 292, so that the connection position between the adapter 30 and the second pole ear 232 is accommodated in the avoidance hole 292, that is, the adapter 30 and the second pole ear 232 can be assembled and connected with each other in the avoidance hole 292.

[0280] It should be noted that in other embodiments, the avoidance hole 292 may not be provided on the mounting frame 29 , and the second pole tab 232 only needs to bypass the mounting frame 29 and then be connected to the adapter 30 .

[0281] By setting a mounting frame 29 between the first body 221 and the second body 231 arranged along the thickness direction X of the first wall, the mounting frame 29 can separate the first body 221 and the second body 231. On the one hand, the mounting frame 29 can play a role in assembling the first body 221 and the second body 231 stably, which is beneficial to reduce the stability of the first electrode assembly 22 and the second electrode assembly 23 assembled in the outer shell 21. On the other hand, it can reduce the phenomenon of the first body 221 and the second body 231 colliding with each other during use. In addition, the mounting frame 29 is provided with avoidance holes 292 which penetrate through both sides of the mounting frame 29 along the thickness direction X of the first wall, and the adapter 30 and the second pole ear 232 are both inserted into the avoidance holes 292. The battery cell 20 adopting such a structure can, on the one hand, reduce the difficulty of connecting the adapter 30 and the second pole ear 232, which is beneficial to reduce the obstruction of the mounting frame 29 to the adapter 30. On the other hand, the mounting frame 29 can also play a certain role in stabilizing and protecting the adapter 30 and the second pole ear 232, which is beneficial to reduce the shaking or damage of the adapter 30 and the second pole ear 232 during use, so as to improve the stability and service life of the battery cell 20.

[0282] According to some embodiments of the present application, referring to Fig.11 and Fig.15 , and please refer to Fig.16 and Fig.17 , Fig.16 A cross-sectional view of a mounting frame 29 of a battery cell 20 provided in some embodiments of the present application, Fig.17 An exploded view of the structure of the mounting frame 29 of the battery cell 20 provided in some embodiments of the present application. The mounting frame 29 may include a first frame body 293 and a second frame body 294 that are detachably connected to each other, the first frame body 293 and the second frame body 294 are arranged along a first direction Y, and the first frame body 293 and the second frame body 294 jointly enclose a avoidance hole 292, and the first direction Y is perpendicular to the thickness direction X of the first wall.

[0283] Among them, the mounting frame 29 can include a first frame body 293 and a second frame body 294 that are detachably connected to each other, that is, the mounting frame 29 is composed of a first frame body 293 and a second frame body 294 that are separately arranged and detachably connected to each other, and the connection structure between the first frame body 293 and the second frame body 294 can be various, for example, the first frame body 293 and the second frame body 294 can be connected to each other by detachable connection methods such as clamping, bolting, etc.

[0284] The first frame 293 and the second frame 294 are jointly enclosed to form the avoidance hole 292, that is, the avoidance hole 292 is formed on the contact surface where the first frame 293 and the second frame 294 abut against each other, so that the avoidance hole 292 is located between the first frame 293 and the second frame 294, that is, the first frame 293 and the second frame 294 are connected to each other along the first direction Y and then spliced ​​together to form the avoidance hole 292, so as to facilitate the adapter 30 and the second pole ear 232 to be connected to each other and then accommodated in the avoidance hole 292.

[0285] The mounting frame 29 is provided with a first frame body 293 and a second frame body 294 arranged along the first direction Y. The first frame body 293 and the second frame body 294 are arranged as a detachable connected structure, and the first frame body 293 and the second frame body 294 jointly enclose a avoidance hole 292 for inserting the adapter 30 and the second pole ear 232. The mounting frame 29 with such a structure is convenient for assembling the adapter 30 and the second pole ear 232 into the avoidance hole 292 after the adapter 30 and the second pole ear 232 are connected to each other, which is conducive to reducing the difficulty of assembling the adapter 30 and the second pole ear 232 into the avoidance hole 292. On the other hand, it is convenient to assemble the mounting frame 29 between the first body 221 and the second body 231, and it is convenient to maintain the adapter 30 and the second pole ear 232 after quickly disassembling the first frame body 293 and the second frame body 294 in the later stage.

[0286] In some embodiments, see Fig.11 , Fig.16 and 17 As shown, a first groove 2931 is provided on the side of the first frame 293 facing the second frame 294, and the first groove 2931 penetrates the first frame 293 along the thickness direction X of the first wall. A second groove 2941 is provided on the side of the second frame 294 facing the first frame 293, and the second groove 2941 penetrates the second frame 294 along the thickness direction X of the first wall. The second groove 2941 and the first groove 2931 enclose a avoidance hole 292.

[0287] The first groove 2931 penetrates the first frame 293 along the thickness direction X of the first wall, that is, the two ends of the first groove 2931 in the thickness direction X of the first wall extend to the two sides of the first frame 293 in the thickness direction X of the first wall. Similarly, the second groove 2941 penetrates the second frame 294 along the thickness direction X of the first wall, that is, the two ends of the second groove 2941 in the thickness direction X of the first wall extend to the two sides of the second frame 294 in the thickness direction X of the first wall.

[0288] The second groove 2941 and the first groove 2931 are combined to form an avoidance hole 292, that is, the first groove 2931 and the second groove are arranged opposite and facing each other in the first direction Y, so that the first groove 2931 and the second groove 2941 are combined to form an avoidance hole 292 that passes through both sides of the mounting frame 29 along the thickness direction X of the first wall after the first frame 293 and the second frame 294 are connected to each other.

[0289] It should be noted that, in other embodiments, the mounting frame 29 may also be other structures. For example, the first frame 293 is provided with a first groove 2931 on the side facing the second frame 294 in the first direction Y, and the second frame 294 is not provided with the second groove 2941. The first groove 2931 and the surface of the second frame 294 facing the first frame 293 are jointly enclosed to form an avoidance hole 292. For another example, the second frame 294 is provided with a second groove 2941 on the side facing the first frame 293 in the first direction Y, and the first frame 293 is not provided with the first groove 2931. The second groove 2941 and the surface of the first frame 293 facing the second frame 294 are jointly enclosed to form an avoidance hole 292.

[0290] By providing a first groove 2931 on the side of the first frame 293 facing the second frame 294, and providing a second groove 2941 on the side of the second frame 294 facing the first frame 293, the first frame 293 and the second frame 294 can be assembled with each other along the first direction Y so that the first groove 2931 and the second groove 2941 can be jointly enclosed to form an avoidance hole 292 for accommodating the adapter 30 and the second pole ear 232. The structure is simple and easy to implement.

[0291] According to some embodiments of the present application, see Fig.17 As shown, a clamping portion 2932 is disposed on one side of the first frame 293 facing the second frame 294 , and a clamping hole 2942 is disposed on one side of the second frame 294 facing the first frame 293 . The clamping hole 2942 is used for the clamping portion 2932 to be clamped in.

[0292] Among them, the snap-in hole 2942 is used for the snap-in portion 2932 to be snapped in, that is, the snap-in portion 2932 of the first frame 293 is used to snap-fit ​​with the snap-in hole 2942 of the second frame 294 to achieve a detachable connection between the first frame 293 and the second frame 294. Of course, in other embodiments, the first frame 293 and the second frame 294 can also be detachably connected by structures such as screw connections.

[0293] Optionally, the clamping portion 2932 disposed on the first frame 293 and the clamping hole 2942 disposed on the second frame 294 may be one or more. Exemplarily, in the first direction Y, five clamping portions 2932 are disposed on the side of the first frame 293 facing the second frame 294, and the five clamping portions 2932 are arranged at intervals along the second direction Z, the second direction Z is the length direction of the mounting frame 29, the thickness direction X of the first wall, the first direction Y and the second direction Z are perpendicular to each other, and five clamping holes 2942 are disposed on the side of the second frame 294 facing the first frame 293, and the clamping holes 2942 are disposed one by one with the clamping portions 2932, and each clamping hole 2942 is used for a clamping portion 2932 to be clamped in. Of course, in other embodiments, the clamping portions 2932 disposed on the first frame 293 and the clamping holes 2942 disposed on the second frame 294 may also be two, three, four or six, etc.

[0294] It should be noted that, in some embodiments, the engaging portion 2932 may also be disposed on a side of the second frame 294 facing the first frame 293 , and correspondingly, the engaging hole 2942 is disposed on a side of the first frame 293 facing the second frame 294 .

[0295] By setting a clamping portion 2932 on the side of the first frame 293 facing the second frame 294, correspondingly, a clamping hole 2942 for the clamping portion 2932 to be clamped into is set on the side of the second frame 294 facing the first frame 293, so that a detachable connection between the first frame 293 and the second frame 294 is achieved through the clamping cooperation between the clamping portion 2932 and the clamping hole 2942. The structure is simple and easy to assemble.

[0296] According to some embodiments of the present application, referring to Fig.11 and Fig.16 , and please refer to Fig.18 , Fig.18 A cross-sectional view of a first electrode assembly 22 of a battery cell 20 provided in some embodiments of the present application. The first electrode tab 222 includes a first root portion 2221 and a first electrode tab portion 2222, the first root portion 2221 connects the first electrode tab portion 2222 and the first body 221, and the first electrode tab portion 2222 connects the adapter 30. Along the thickness direction X of the first wall, a first accommodating groove 295 is provided on one side of the mounting frame 29 facing the first body 221, the first accommodating groove 295 is used to accommodate the first root portion 2221, and the avoidance hole 292 passes through the bottom surface of the first accommodating groove 295.

[0297] Among them, the first root portion 2221 of the first pole ear 222 is a smoothed area of ​​the first pole ear 222, the first pole ear portion 2222 of the first pole ear 222 is an area of ​​the first pole ear 222 used to connect with the adapter 30, the first root portion 2221 is connected to one end of the first main body 221 facing the second main body 231, and the first pole ear portion 2222 is connected to the side of the first root portion 2221 away from the first main body 221.

[0298] A first receiving groove 295 is provided on the side of the mounting frame 29 facing the first main body 221, that is, the first receiving groove 295 is provided on the surface of the mounting frame 29 facing the first main body 221 in the thickness direction X of the first wall, so that the first root portion 2221 can be indirectly received in the first receiving groove 295 through the receiving piece 24, that is, the first root portion 2221 will arch a local area of ​​the receiving piece 24, and the arched area of ​​the receiving piece 24 and the first root portion 2221 can both be inserted into the first receiving groove 295, so that the mounting frame 29 can share part of the space with the first root portion 2221 in the thickness direction X of the first wall, which is beneficial to improve the internal space utilization rate of the battery cell 20.

[0299] The avoidance hole 292 penetrates the bottom surface of the first receiving groove 295 , that is, the avoidance hole 292 extends from one end close to the first body 221 in the thickness direction X of the first wall to the bottom surface of the first receiving groove 295 .

[0300] It should be noted that in the embodiment where the mounting frame 29 includes a first frame body 293 and a second frame body 294, see Fig.11 and Fig.16 As shown, a portion of the first receiving groove 295 is disposed on a surface of the first frame 293 facing the first body 221 , and another portion is disposed on a surface of the second frame 294 facing the first body 221 .

[0301] By setting a first accommodating groove 295 for accommodating the first root portion 2221 of the first pole ear 222 on the side of the mounting frame 29 facing the first main body 221, and the avoidance hole 292 is a structure that penetrates the bottom surface of the first accommodating groove 295, so that on the one hand, after the first root portion 2221 of the first pole ear 222 arches a part of the receiving piece 24, the mounting frame 29 can avoid the first root portion 2221 of the first pole ear 222, so as to reduce the phenomenon that the mounting frame 29 squeezes and damages the first pole ear 222, and on the other hand, it is convenient for the adapter 30 to be connected to the first pole ear portion 2222 and then pass through the channel of the receiving piece 24 and be inserted into the avoidance hole 292 to be assembled and connected with the second pole ear 232.

[0302] In some embodiments, see Fig.16 and 18As shown, along the thickness direction X of the first wall, the first root portion 2221 has a first surface 2221 a away from the first body 221 , the first pole ear portion 2222 is protruded from the first surface 2221 a , and the first surface 2221 a is matched with the bottom surface of the first receiving groove 295 .

[0303] The first pole ear portion 2222 is protruded from the first surface 2221 a , that is, the first pole ear portion 2222 is connected to the first surface 2221 a of the first root portion 2221 and protrudes from the first surface 2221 a , so that the first pole ear portion 2222 can be connected to the adapter 30 .

[0304] The first surface 2221 a matches with the bottom surface of the first receiving groove 295 , that is, the first surface 2221 a of the first root portion 2221 can indirectly abut against a portion of the bottom surface of the first receiving groove 295 through the receiving member 24 .

[0305] By setting the first surface 2221a of the first root portion 2221 facing the bottom surface of the first accommodating groove 295 to a structure that fits with the bottom surface of the first accommodating groove 295, the bottom surface of the first accommodating groove 295 can be indirectly fitted with the first surface 2221a of the first root portion 2221 through the receiving member 24, so that the bottom surface of the first accommodating groove 295 can also play a certain shaping and gathering role on the first root portion 2221 of the first pole lug 222, which is beneficial to maintaining the shape of the first root portion 2221 of the first pole lug 222.

[0306] According to some embodiments of the present application, referring to Fig.16 , and please refer to Fig.19 , Fig.19 A cross-sectional view of a second electrode assembly 23 of a battery cell 20 provided in some embodiments of the present application. The second pole ear 232 includes a second root portion 2321 and a second pole ear portion 2322, the second root portion 2321 connects the second pole ear portion 2322 and the second body 231, the second pole ear portion 2322 is inserted into the avoidance hole 292, and the second pole ear portion 2322 is connected to the adapter 30. Along the thickness direction X of the first wall, a second accommodating groove 296 is provided on one side of the mounting frame 29 facing the second body 231, the second accommodating groove 296 is used to accommodate the second root portion 2321, and the avoidance hole 292 runs through the bottom surface of the second accommodating groove 296.

[0307] Among them, the second root 2321 of the second pole ear 232 is the smoothed area of ​​the second pole ear 232, the second pole ear portion 2322 of the second pole ear 232 is the area of ​​the second pole ear 232 used to connect with the adapter 30, the second root 2321 is connected to one end of the second body 231 facing the first body 221, and the second pole ear portion 2322 is connected to the side of the second root 2321 away from the second body 231.

[0308] A second accommodating groove 296 is provided on the side of the mounting frame 29 facing the second main body 231, that is, the second accommodating groove 296 is provided on the surface of the mounting frame 29 facing the second main body 231 in the thickness direction X of the first wall, so that the second root portion 2321 can be accommodated in the second accommodating groove 296, so that the mounting frame 29 can share part of the space with the second root portion 2321 in the thickness direction X of the first wall, which is beneficial to improve the internal space utilization rate of the battery cell 20.

[0309] The avoidance hole 292 passes through the bottom surface of the second receiving groove 296 , that is, the avoidance hole 292 extends from one end close to the second body 231 in the thickness direction X of the first wall to the bottom surface of the second receiving groove 296 .

[0310] It should be noted that in the embodiment where the mounting frame 29 includes a first frame body 293 and a second frame body 294, see Fig.16 As shown, a portion of the second receiving groove 296 is disposed on a surface of the first frame 293 facing the second body 231 , and another portion is disposed on a surface of the second frame 294 facing the second body 231 .

[0311] By arranging a second accommodating groove 296 for accommodating the second root portion 2321 of the second pole lug 232 on the side of the mounting frame 29 facing the second main body 231, and the avoidance hole 292 is a structure that penetrates the bottom surface of the second accommodating groove 296, on the one hand, the mounting frame 29 can avoid the second root portion 2321 of the second pole lug 232 to reduce the phenomenon of the mounting frame 29 squeezing and damaging the second pole lug 232, and on the other hand, it is convenient for the second pole lug portion 2322 of the second pole lug 232 to be inserted into the avoidance hole 292 for assembly connection with the adapter 30.

[0312] In some embodiments, see Fig.16 and Fig.19 As shown, along the thickness direction X of the first wall, the second root portion 2321 has a second surface 2321 a away from the second body 231 , the second pole ear portion 2322 is protruded from the second surface 2321 a , and the second surface 2321 a is matched with the bottom surface of the second receiving groove 296 .

[0313] The second pole ear portion 2322 is protruded from the second surface 2321 a , that is, the second pole ear portion 2322 is connected to the second surface 2321 a of the second root portion 2321 and protrudes from the second surface 2321 a , so that the second pole ear portion 2322 can be connected to the adapter 30 .

[0314] The second surface 2321 a fits with the bottom surface of the second receiving groove 296 , that is, the second surface 2321 a of the second root portion 2321 can abut against a portion of the bottom surface of the second receiving groove 296 .

[0315] By setting the second surface 2321a of the second root portion 2321 facing the bottom surface of the second accommodating groove 296 to a structure that fits with the bottom surface of the second accommodating groove 296, so that the bottom surface of the second accommodating groove 296 can fit with the second surface 2321a of the second root portion 2321, the bottom surface of the second accommodating groove 296 can also play a certain shaping and gathering role on the second root portion 2321 of the second pole lug 232, which is beneficial to maintaining the shape of the second root portion 2321 of the second pole lug 232.

[0316] According to some embodiments of the present application, see Fig.11 and Fig.15 As shown, the mounting frame 29 is provided with a second through hole 297 , which penetrates the mounting frame 29 along the thickness direction X of the first wall, and the second through hole 297 is configured to allow electrolyte to pass through.

[0317] Among them, the second through hole 297 passes through the mounting frame 29 along the thickness direction X of the first wall, that is, the second through hole 297 is a structure extending along the thickness direction X of the first wall, and the two ends of the second through hole 297 respectively pass through the surfaces of the mounting hole on both sides of the thickness direction X of the first wall.

[0318] By providing a second through hole 297 on the mounting frame 29 that passes through both sides of the mounting frame 29 along the thickness direction X of the first wall, the electrolyte can flow between the first electrode assembly 22 and the second electrode assembly 23 through the second through hole 297, which is beneficial to improving the fluidity of the electrolyte between the first electrode assembly 22 and the second electrode assembly 23 to improve the wetting effect of the first electrode assembly 22 and the second electrode assembly 23 on the one hand, and on the other hand, it is convenient for the gas generated between the first electrode assembly 22 and the second electrode assembly 23 to flow from the second through hole 297.

[0319] In some embodiments, see Fig.11 , Fig.15 and Fig.17 As shown, a plurality of second through holes 297 are provided on the mounting frame 29 .

[0320] For example, in an embodiment where the mounting frame 29 includes a first frame body 293 and a second frame body 294, a plurality of second through holes 297 are provided on the first frame body 293, and the plurality of second through holes 297 are arranged at intervals along the second direction Z. Correspondingly, a plurality of second through holes 297 are also provided on the second frame body 294, and the plurality of second through holes 297 are arranged at intervals along the second direction Z. That is, Fig.15In the embodiment, the mounting frame 29 is provided with two rows of second through holes 297 arranged along the first direction Y, and each row of second through holes 297 includes a plurality of second through holes 297 arranged at intervals along the second direction Z. Of course, in other embodiments, the mounting frame 29 may also be provided with one row, three rows, or four rows of second through holes 297 arranged along the first direction Y, etc.

[0321] By providing a plurality of second through holes 297 on the mounting frame 29, it is helpful to further improve the fluidity of the electrolyte between the first electrode assembly 22 and the second electrode assembly 23, so as to further improve the wetting effect of the first electrode assembly 22 and the second electrode assembly 23, and can further improve the flow effect of the gas generated between the first electrode assembly 22 and the second electrode assembly 23.

[0322] In some embodiments, see Fig.16 and Fig.17 As shown, a cavity 298 is formed inside the mounting bracket 29 , and the cavity 298 is communicated with the second through hole 297 .

[0323] Among them, the cavity 298 is connected to the second through hole 297, that is, the second through hole 297 is a structure extending along the thickness direction X of the first wall, and the second through hole 297 passes through the cavity wall surface of the cavity 298, so that at least part of the projection of the second through hole 297 in the thickness direction X of the first wall is located in the cavity 298.

[0324] It should be noted that in the embodiment where the mounting frame 29 includes a first frame body 293 and a second frame body 294, Fig.16 and Fig.17 In the embodiment, part of the cavity 298 is located inside the first frame 293, and the other part is located inside the second frame 294, that is, the cavity 298 passes through the side of the first frame 293 facing the second frame 294 and passes through the side of the second frame 294 facing the first frame 293, so that the first frame 293 and the second frame 294 are together enclosed to form the cavity 298. Exemplarily, two cavities 298 are formed inside the mounting frame 29, and the two cavities 298 are arranged at intervals along the thickness direction X of the first wall, and the second through hole 297 passes through the two cavities 298 in sequence along the thickness direction X of the first wall.

[0325] By setting a cavity 298 inside the mounting frame 29, and the cavity 298 is interconnected with the second through hole 297, that is, the second through hole 297 is a structure that penetrates the inner wall surface of the cavity 298, the mounting frame 29 adopting this structure can, on the one hand, reduce the weight of the mounting frame 29 by setting the cavity 298, so as to reduce the overall weight of the battery cell 20, which is beneficial to improve the energy density of the battery cell 20; on the other hand, the cavity 298 can also play a certain buffering role for the electrolyte, which is beneficial to further improve the wetting effect of the first electrode assembly 22 and the second electrode assembly 23.

[0326] According to some embodiments of the present application, referring to Figure 4 and Fig.10 , and please refer to Fig. 20 , Fig. 20 The first electrode assembly 22 and the second electrode assembly 23 provided in some embodiments of the present application are schematically shown as an assembly diagram of the connector 32. The battery cell 20 may further include a connector 32, which connects the mounting frame 29, the receiving member 24 and the second body 231.

[0327] Among them, the connecting member 32 is located on the outside of the mounting frame 29, and the connecting member 32 serves to connect the mounting frame 29, the receiving member 24 and the second main body 231. Optionally, the structure of the connecting member 32 connecting the mounting frame 29, the receiving member 24 and the second main body 231 can be various, such as bonding, hot melt connection, etc.

[0328] The battery cell 20 is also provided with a connecting piece 32 connecting the mounting frame 29, the receiving piece 24 and the second main body 231, so that the mounting frame 29, the second main body 231 and the receiving piece 24 covered on the outside of the first electrode assembly 22 can be connected as a whole through the connecting piece 32, which is beneficial to improve the structural stability of the mounting frame 29 arranged between the first main body 221 and the second main body 231, thereby reducing the risk of the mounting frame 29 shaking or detaching between the first main body 221 and the second main body 231.

[0329] In some embodiments, the connecting member 32 is bonded to the mounting frame 29 , the receiving member 24 , and the second body 231 .

[0330] Optionally, the connecting member 32 is bonded to the outside of the mounting frame 29, the receiving member 24 and the second main body 231. The connecting member 32 may be adhesive paper or tape, etc. Of course, the connecting member 32 may also be an insulating film 244 provided with an adhesive layer, etc. The adhesive layer may be glue or hot melt adhesive, etc. The material of the connecting member 32 may be rubber, silicone or plastic, etc.

[0331] By setting the connecting member 32 to a structure bonded to the mounting frame 29, the receiving member 24 and the second main body 231, the mounting frame 29, the receiving member 24 and the second main body 231 are connected as a whole. The battery cell 20 adopting this structure is conducive to reducing the difficulty of assembling the connecting member 32 connecting the mounting frame 29, the receiving member 24 and the second main body 231, so as to improve the assembly efficiency of the battery cell 20.

[0332] According to some embodiments of the present application, see Fig. 20As shown, the connecting member 32 surrounds the outer sides of the mounting frame 29, the receiving member 24 and the second body 231 around an axis extending along the thickness direction X of the first wall. In other words, the connecting member 32 is an annular structure extending along the circumference of the mounting frame 29, so that the connecting member 32 covers the outer sides of the mounting frame 29, the receiving member 24 and the second body 231, and the side of the connecting member 32 facing the mounting frame 29 is bonded to the outer surfaces of the mounting frame 29, the receiving member 24 and the second body 231.

[0333] By setting the connecting piece 32 as an annular structure arranged around the mounting frame 29, the receiving piece 24 and the second main body 231, the connecting piece 32 is covered on the outer side of the mounting frame 29, the receiving piece 24 and the second main body 231, which is beneficial to further improve the structural stability of the connecting piece 32 connecting the mounting frame 29, the receiving piece 24 and the second main body 231, and further improve the structural stability of the mounting frame 29 set between the first main body 221 and the second main body 231, so as to reduce the risk of the mounting frame 29 shaking or detaching between the first main body 221 and the second main body 231.

[0334] In some embodiments, please see Fig. 20 As shown, a first through hole 242 is provided on the outer peripheral surface of the receiving member 24 , the first through hole 242 is connected to the accommodating cavity 241 , and the projection of the first through hole 242 in the axial direction thereof does not overlap with the connecting member 32 .

[0335] Among them, the first through hole 242 serves to allow the electrolyte in the accommodating cavity 241 of the receiving member 24 to overflow, and the axial projection of the first through hole 242 does not overlap with the connecting member 32, that is, the first through hole 242 is not blocked by the connecting member 32 connected to the outside of the receiving member 24, that is, the first through hole 242 and the connecting member 32 are arranged at intervals in the thickness direction X of the first wall.

[0336] The outer peripheral surface of the receiving member 24 is provided with a first through hole 242 which is connected to the accommodating cavity 241 inside the receiving member 24, so that excess electrolyte in the receiving member 24 can overflow out of the accommodating cavity 241 through the first through hole 242 and infiltrate the second electrode assembly 23 located outside the receiving member 24. By arranging the first through hole 242 so that its axial projection does not overlap with the connecting member 32, the connecting member 32 is made to have a structure that does not cover the first through hole 242, thereby reducing the obstruction of the connecting member 32 to the electrolyte, so that the electrolyte located in the accommodating cavity 241 can smoothly overflow out of the accommodating cavity 241 through the first through hole 242.

[0337] According to some embodiments of the present application, see Figure 5 , Figure 6 and Fig.13As shown, the first electrode assembly 22 includes two first pole ears 222, the two first pole ears 222 have opposite polarities and are both arranged at one end of the first body 221 facing the second body 231. The second electrode assembly 23 includes two second pole ears 232, the two second pole ears 232 have opposite polarities and are both arranged at one end of the second body 231 facing the first body 221. The first pole ears 222 and the second pole ears 232 with the same polarity are connected.

[0338] The polarities of the two first pole tabs 222 are opposite, that is, the two first pole tabs 222 respectively output or input the positive electrode and the negative electrode of the first electrode assembly 22. Correspondingly, in the embodiment where the battery cell 20 is provided with an adapter 30, there are two adapters 30, each of which is connected to one first pole tab 222.

[0339] For example, in Fig.13 In the embodiment, the two first pole tabs 222 are arranged at intervals along the second direction Z. It should be noted that in the embodiment where the battery cell 20 is provided with a mounting frame 29 and the mounting frame 29 is provided with an avoidance hole 292, as shown in FIG. Fig.11 and Fig.15 As shown, two avoidance holes 292 are provided on the mounting hole, and the two avoidance holes 292 are arranged at intervals along the second direction Z. The avoidance holes 292 are provided in a one-to-one correspondence with the adapter 30, and each avoidance hole 292 is used for inserting an adapter 30.

[0340] The polarities of the two second pole tabs 232 are opposite, that is, the two second pole tabs 232 respectively output or input the positive electrode and the negative electrode of the second electrode assembly 23. Correspondingly, each second pole tab 232 is connected to a first pole tab 222 via a transition piece 30.

[0341] For example, in Fig.13 In the embodiment, the two second pole tabs 232 are arranged at intervals along the second direction Z. It should be noted that in the embodiment where the battery cell 20 is provided with a mounting frame 29 and the mounting frame 29 is provided with an avoidance hole 292, as shown in FIG. Fig.11 and Fig.15 As shown, two avoidance holes 292 are arranged on the mounting hole, and the two avoidance holes 292 are arranged at intervals along the second direction Z. The avoidance holes 292 are arranged one-to-one with the second pole lugs 232, and each avoidance hole 292 is used for inserting a second pole lug 232.

[0342] The first pole lug 222 and the second pole lug 232 of the same polarity are connected, that is, the first pole lug 222 and the second pole lug 232 of the same output or input positive pole are connected to each other, and the first pole lug 222 and the second pole lug 232 of the same output or input negative pole are connected to each other, so as to realize the parallel electrical connection between the first electrode assembly 22 and the second electrode assembly 23. It should be noted that in the embodiment where the battery cell 20 is provided with an adapter 30, the first pole lug 222 and the second pole lug 232 of the polarity box 10 are connected through an adapter 30.

[0343] The two first pole ears 222 with opposite polarities of the first electrode assembly 22 are both arranged at one end of the first body 221 facing the second body 231, and the two second pole ears 232 with opposite polarities of the second electrode assembly 23 are both arranged at one end of the second body 231 facing the first body 221. The first pole ears 222 are interconnected with the corresponding second pole ears 232 with the same polarity to achieve parallel connection between the first electrode assembly 22 and the second electrode assembly 23, thereby achieving electrical connection between the first electrode assembly 22 and the second electrode assembly 23. The structure is simple and easy to assemble.

[0344] In some embodiments, see Figure 3 , Figure 4 , Figure 5 and Fig.13 As shown, along the thickness direction X of the first wall, the housing 21 has a second wall 214 arranged opposite to the first wall 211. The battery cell 20 may also include two electrode terminals 25, both of which are insulated and installed on the second wall 214, and the electrode terminals 25 are used to output or input the electric energy of the battery cell 20. The first electrode assembly 22 also includes two third pole ears 223, the two third pole ears 223 have opposite polarities and are arranged at one end of the first body 221 facing the second wall 214 along the thickness direction X of the first wall, and the two third pole ears 223 are respectively connected to the two electrode terminals 25.

[0345] The two third pole tabs 223 have opposite polarities, that is, the two third pole tabs 223 output or input the positive and negative poles of the first electrode assembly 22 respectively, so that the two third pole tabs 223 can output or input electrical energy of the battery cell 20 after being connected to the two electrode terminals 25 respectively.

[0346] Optionally, there may be multiple connection structures between the third pole tab 223 and the electrode terminal 25. The third pole tab 223 and the electrode terminal 25 may be directly connected, for example, the third pole tab 223 and the electrode terminal 25 are welded or abutted against each other, etc. Of course, the third pole tab 223 and the electrode terminal 25 may also be indirectly connected, for example, the third pole tab 223 and the current collecting component are welded or abutted against each other and then welded or abutted against each other with the electrode terminal 25, etc.

[0347] It should be noted that the second wall 214 for mounting the electrode terminal 25 may be the end cover 213 of the housing 21 or a wall of the housing 212. Figure 3 and Figure 4 In the figure, the second wall 214 is the end cover 213 of the outer shell 21. Of course, in some embodiments, the second wall 214 can also be the bottom wall of the shell 212 of the outer shell 21 and the end cover 213 arranged opposite to each other, or the side wall of the shell 212 of the outer shell 21 and the end cover 213 connected and adjacent to each other.

[0348] By setting two third pole ears 223 at one end of the first main body 221 of the first electrode assembly 22 facing the second wall 214, and the two third pole ears 223 are correspondingly connected to the two electrode terminals 25 set on the second wall 214, so as to realize the input or output of electric energy of the battery cell 20. After the first electrode assembly 22 and the second electrode assembly 23 are electrically connected to each other, the battery cell 20 using this structure only needs to be connected to the electrode terminal 25 through the third pole ear 223 to realize the input or output of electric energy of the battery cell 20, and there is no need to set a plurality of electrode output terminals. Therefore, while increasing the length dimension of the battery cell 20 in the thickness direction X of the first wall, only two electrode terminals 25 are needed to realize the input or output of electric energy of the battery cell 20, thereby effectively reducing the difficulty of assembling the battery cell 20, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0349] According to some embodiments of the present application, referring to Figure 4 , and please refer to Fig.21 , Fig.21 Schematic diagram of the assembly of the first electrode assembly 22, the second electrode assembly 23 and the third insulating member 33 provided in some embodiments of the present application. The battery cell 20 may further include a third insulating member 33, which is wrapped around an axis extending along the thickness direction X of the first wall and is disposed on the outer side of the receiving member 24 and the second electrode assembly 23, and the insulating member is configured to insulate and isolate the second electrode assembly 23 from the housing 21.

[0350] Among them, the third insulating member 33 is wrapped around the axis extending along the thickness direction X of the first wall and the outer side of the receiving member 24 and the second electrode assembly 23, that is, the third insulating member 33 is arranged around the outer side of the receiving member 24 and the second electrode assembly 23 along the circumference of the first electrode assembly 22 and the second electrode assembly 23, so that the receiving member 24 and the second electrode assembly 23 are both located on the inner side of the third insulating member 33, so that the third insulating member 33 is located between the outer shell 21 and the receiving member 24 and between the outer shell 21 and the second electrode assembly 23.

[0351] Exemplarily, the third insulating member 33 may be made of various materials, for example, the third insulating member 33 may be made of rubber, silicone or plastic.

[0352] In some embodiments, an adhesive layer may be provided on the side of the third insulating member 33 facing the receiving member 24 or the second electrode assembly 23 so that the third insulating member 33 can be bonded to the outer surface of the receiving member 24 or the second electrode assembly 23. The adhesive layer may be glue or double-sided tape.

[0353] The battery cell 20 is also provided with a third insulating member 33, and the third insulating member 33 is coated on the outside of the receiving member 24 and the second electrode assembly 23. On the one hand, the third insulating member 33 can separate the first electrode assembly 22 and the outer shell 21 as well as the second electrode assembly 23 and the outer shell 21, which is beneficial to reduce the risk of short circuit between the first electrode assembly 22 and the outer shell 21 and between the second electrode assembly 23 and the outer shell 21, so as to improve the reliability of the battery cell 20. On the other hand, the third insulating member 33 can further fasten the second electrode assembly 23 and the receiving member 24 coated on the outside of the first electrode assembly 22, so as to realize the connection of the first electrode assembly 22 and the second electrode assembly 23 arranged along the thickness direction X of the first wall as a whole, which is beneficial to improve the overall structural stability of the first electrode assembly 22 and the second electrode assembly 23.

[0354] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the housing 21 may include a shell 212 and an end cap 213. The shell 212 includes an integrally formed side wall and a first wall 211, the side wall is arranged around the first wall 211, along the thickness direction X of the first wall, one end of the side wall is connected to the first wall 211, and the other end is enclosed to form a second opening 2121, the side wall and the first wall 211 jointly define a receiving space for accommodating the first electrode assembly 22 and the second electrode assembly 23, and the end cap 213 closes the second opening 2121. That is, the first wall 211 is the bottom wall of the shell 212 arranged opposite to the end cap 213 in the thickness direction X of the first wall, and correspondingly, the second wall 214 is the end cap 213, that is, the electrode terminal 25 is installed on the end cap 213, and the third pole ear 223 of the first electrode assembly 22 is arranged at one end of the first body 221 facing the end cap 213 in the thickness direction X of the first wall.

[0355] The shell 212 includes an integrally formed side wall and a first wall 211 , that is, the shell 212 is manufactured by an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding, that is, the side wall and the first wall 211 of the shell 212 are an integral structure.

[0356] By setting the first wall 211 of the outer shell 21 as a wall of the shell 212 that is arranged opposite to the end cover 213 in the first direction Y, the first electrode assembly 22 and the second electrode assembly 23 accommodated in the outer shell 21 are structures supported by the bottom wall of the shell 212. This structure enables the opening of the shell 212 to be located on the upper side of the outer shell 21, which is beneficial to reduce the risk of leakage of the battery cell 20 during use due to connection failure between the end cover 213 and the shell 212.

[0357] It should be noted that the structure of the battery cell 20 is not limited thereto. In some embodiments, the battery cell 20 may also be other structures. For example, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has a storage space with a second opening 2121 formed inside. The storage space is used to store the first electrode assembly 22 and the second electrode assembly 23. The end cap 213 closes the second opening 2121, and the end cap 213 is the first wall 211. In other words, the battery cell 20 is a structure in which the end cap 213 is placed upside down. Correspondingly, the second wall 214 is the bottom wall of the shell 212 arranged opposite to the end cap 213 in the thickness direction X of the first wall, that is, the electrode terminal 25 is installed on the bottom wall of the shell 212, and the third pole ear 223 of the first electrode assembly 22 is arranged at one end of the first body 221 facing the bottom wall of the shell 212 in the thickness direction X of the first wall.

[0358] By setting the first wall 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the first electrode assembly 22 and the second electrode assembly 23 into the shell 212, and convenient for the end cover 213 to support the second electrode assembly 23, which is beneficial to reduce the difficulty of assembling the battery cell 20 and improve the production efficiency of the battery cell 20.

[0359] According to some embodiments of the present application, the present application further provides a battery 100, and the battery 100 includes a battery cell 20 of any of the above schemes.

[0360] Among them, see Figure 2 As shown, the battery 100 may further include a housing 10 , in which the battery cells 20 are accommodated.

[0361] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0362] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures both with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0363] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0364] Optionally, the number of battery cells 20 disposed in the box body 10 may be one or more. Figure 2 In the embodiment, a plurality of battery cells 20 are arranged in the box 10 of the battery 100, and the plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10.

[0365] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0366] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0367] According to some embodiments of the present application, the present application further provides an electrical device, which includes a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0368] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0369] According to some embodiments of the present application, see Figures 3 to 21As shown, the present application provides a battery cell 20, which includes a shell 21, two electrode terminals 25, a first electrode assembly 22, a second electrode assembly 23, a receiving member 24, a first insulating member 27, a second insulating member 28, two adapters 30, a sealing member 31 mounting frame 29, a connecting member 32 and a third insulating member 33. The shell 21 has a first wall 211 and a second wall 214 arranged opposite to each other, and the second wall 214 is provided with a liquid injection hole 2141. The shell 21 includes a shell 212 and an end cover 213. The shell 212 includes an integrally formed side wall and a first wall 211. The side wall is arranged around the first wall 211. Along the thickness direction X of the first wall, one end of the side wall is connected to the first wall 211, and the other end is enclosed to form a second opening 2121. The side wall and the first wall 211 jointly define a receiving space. The end cover 213 closes the second opening 2121, and the end cover 213 is the second wall 214. The length direction of the housing 21 is consistent with the thickness direction X of the first wall. The length of the housing 21 is L, satisfying that L ≥ 250 mm. Both electrode terminals 25 are insulated and mounted on the second wall 214. The electrode terminals 25 are used to output or input the electrical energy of the battery cell 20. The first electrode assembly 22 and the second electrode assembly 23 are both wound structures formed by winding around an axis extending along the thickness direction X of the first wall. The first electrode assembly 22 and the second electrode assembly 23 are both accommodated in the housing 21 and arranged along the thickness direction X of the first wall. The first electrode assembly 22 and the second electrode assembly 23 are electrically connected. The second electrode assembly 23 is located between the first wall 211 and the first electrode assembly 22, and the first wall 211 is configured to support the second electrode assembly 23. The first electrode assembly 22 includes a first body 221, two first pole ears 222 and two third pole ears 223, and the second electrode assembly 23 includes a second body 231 and two second pole ears 232. The second body 231 and the first body 221 are arranged along the thickness direction X of the first wall. Along the thickness direction X of the first wall, the two first pole ears 222 are both arranged at one end of the first body 221 facing the second body 231 and have opposite polarities, and the two third pole ears 223 are both arranged at one end of the first body 221 away from the second body 231 and have opposite polarities. The two third pole ears 223 are respectively connected to the two electrode terminals 25, and the two second pole ears 232 are both arranged at one end of the second body 231 facing the first body 221 and have opposite polarities. The first pole ears 222 with the same polarity are connected to the second pole ears 232 to electrically connect the first electrode assembly 22 and the second electrode assembly 23. The receiving member 24 is made of insulating material and is disposed in the housing 21. A receiving cavity 241 is formed inside the receiving member 24. The receiving cavity 241 accommodates the first electrode assembly 22 and the electrolyte. A plurality of first through holes 242 are disposed on the outer peripheral surface of the receiving member 24. The plurality of first through holes 242 are arranged at intervals along the circumference of the first electrode assembly 22. The first through holes 242 are connected to the receiving cavity 241. The first through holes 242 are located between the end surfaces at both ends of the first electrode assembly 22 along the thickness direction X of the first wall.The accommodating cavity 241 is formed with a first opening 243 at one end close to the second wall 214 in the thickness direction X of the first wall, and the first opening 243 is communicated with the injection hole 2141. The receiving member 24 includes two diaphragms 244, which are arranged along the first direction Y, and the two diaphragms 244 are jointly enclosed to form the accommodating cavity 241, and the diaphragms 244 form a first connection area 2441 at one end close to the first wall 211 in the thickness direction X of the first wall, and the first connection areas 2441 of the two diaphragms 244 are stacked and connected by hot melt, and two second connection areas 2442 are respectively formed at both ends of the diaphragms 244 in the second direction Z, and the second connection areas 2442 of the two diaphragms 244 are correspondingly stacked and connected by hot melt, and the thickness direction X of the first wall, the first direction Y and the second direction Z are perpendicular to each other. The first insulating member 27 is disposed between the first electrode assembly 22 and the receiving member 24 and is bonded to the first electrode assembly 22. The first insulating member 27 is disposed around the first electrode assembly 22 around an axis extending along the thickness direction X of the first wall, and the projection of the first through hole 242 in its axial direction is located in the first insulating member 27. The second insulating member 28 is disposed on the side of the second wall 214 facing the first electrode assembly 22, and the second insulating member 28 is configured to insulate and isolate the second wall 214 and the first electrode assembly 22. One end of the receiving member 24 facing the second wall 214 in the thickness direction X of the first wall is hot-melt-connected to the second insulating member 28, and the second insulating member 28 closes the first opening 243. Each adapter 30 is connected to a first pole ear 222 and a second pole ear 232, the first pole ear 222 is located in the accommodating cavity 241, and the second pole ear 232 is located outside the receiving member 24. The receiving member 24 is provided with a channel for the adapter 30 to pass through at one end close to the second body 231 in the thickness direction X of the first wall, and the channel is formed between the first connection areas 2441 of the two diaphragms 244. The sealing member 31 is provided between the adapter 30 and the receiving member 24, and the sealing member 31 is configured to seal the gap between the adapter 30 and the receiving member 24. The mounting frame 29 is accommodated in the housing 21 and is located outside the receiving member 24. The mounting frame 29 is disposed between the first body 221 and the second body 231 along the thickness direction X of the first wall. The mounting frame 29 is configured to separate the first body 221 and the second body 231. The mounting frame 29 is provided with an avoidance groove 291 on one side facing the first body 221 in the thickness direction X of the first wall. The avoidance groove 291 is used to accommodate the first connection areas 2441 of the two diaphragms 244. The mounting frame 29 is provided with an avoidance hole 292, which penetrates the mounting frame 29 along the thickness direction X of the first wall. The adapter 30 and the second pole ear 232 are both inserted into the avoidance hole 292. The mounting frame 29 includes a first frame body 293 and a second frame body 294 which are detachably connected to each other. The first frame body 293 and the second frame body 294 are arranged along a first direction Y, and the first frame body 293 and the second frame body 294 jointly enclose a avoidance hole 292. The first direction Y is perpendicular to the thickness direction X of the first wall.A first groove 2931 is provided on the side of the first frame 293 facing the second frame 294. The first groove 2931 penetrates the first frame 293 along the thickness direction X of the first wall. A second groove 2941 is provided on the side of the second frame 294 facing the first frame 293. The second groove 2941 penetrates the second frame 294 along the thickness direction X of the first wall. The second groove 2941 and the first groove 2931 enclose a avoidance hole 292. A clamping portion 2932 is provided on the side of the first frame 293 facing the second frame 294. A clamping hole 2942 is provided on the side of the second frame 294 facing the first frame 293. The clamping hole 2942 is used for the clamping portion 2932 to be clamped. The mounting frame 29 is provided with a plurality of second through holes 297. The second through holes 297 penetrate the mounting frame 29 along the thickness direction X of the first wall. The second through holes 297 are configured to allow electrolyte to pass through. A cavity 298 is formed inside the mounting frame 29, and the cavity 298 is connected to the second through hole 297. The connecting member 32 surrounds the mounting frame 29, the receiving member 24, and the outer side of the second body 231 around the axis extending along the thickness direction X of the first wall, and the connecting member 32 is bonded to the mounting frame 29, the receiving member 24, and the second body 231, and the projection of the first through hole 242 in the axial direction thereof does not overlap with the connecting member 32. The third insulating member 33 is wrapped around the axis extending along the thickness direction X of the first wall and the outer side of the receiving member 24 and the second electrode assembly 23, and the insulating member is configured to insulate and isolate the second electrode assembly 23 from the housing 21. The first pole ear 222 includes a first root portion 2221 and a first pole ear portion 2222, the first root portion 2221 connects the first pole ear portion 2222 and the first main body 221, the first pole ear portion 2222 is connected to the adapter 30, along the thickness direction X of the first wall, a first accommodating groove 295 is provided on the side of the mounting frame 29 facing the first main body 221, the first accommodating groove 295 is used to accommodate the first root portion 2221, the avoidance hole 292 passes through the bottom surface of the first accommodating groove 295, the first root portion 2221 has a first surface 2221a facing away from the first main body 221, the first pole ear portion 2222 is protruded from the first surface 2221a, and the first surface 2221a is matched with the bottom surface of the first accommodating groove 295. The second pole ear 232 includes a second root portion 2321 and a second pole ear portion 2322, the second root portion 2321 connects the second pole ear portion 2322 and the second main body 231, the second pole ear portion 2322 is inserted into the avoidance hole 292, and the second pole ear portion 2322 is connected to the adapter 30, along the thickness direction X of the first wall, a second accommodating groove 296 is provided on the side of the mounting frame 29 facing the second main body 231, the second accommodating groove 296 is used to accommodate the second root portion 2321, the avoidance hole 292 passes through the bottom surface of the second accommodating groove 296, the second root portion 2321 has a second surface 2321a facing away from the second main body 231, the second pole ear portion 2322 is protruded from the second surface 2321a, and the second surface 2321a is matched with the bottom surface of the second accommodating groove 296.

[0370] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0371] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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 cell, characterized in that: include: a housing having a first wall; A first electrode assembly and a second electrode assembly are both contained in the housing and arranged along the thickness direction of the first wall, the second electrode assembly is located between the first wall and the first electrode assembly, and the first wall is configured to support the second electrode assembly; The receiving member is arranged in the shell, and a receiving cavity is formed inside the receiving member, and the receiving cavity receives the first electrode assembly and the electrolyte.

2. The battery cell according to claim 1, characterized in that: A first through hole is provided on the outer peripheral surface of the receiving member, the first through hole is connected to the accommodating cavity, and along the thickness direction of the first wall, the first through hole is located between the end surfaces at both ends of the first electrode assembly.

3. The battery cell according to claim 2, characterized in that: The receiving member is provided with a plurality of the first through holes, and the plurality of the first through holes are arranged at intervals along the circumference of the first electrode assembly.

4. The battery cell according to claim 2, characterized in that: The battery cell further comprises: The first insulating member is disposed between the first electrode assembly and the receiving member, and the projection of the first through hole in the axial direction is located inside the first insulating member.

5. The battery cell according to claim 4, characterized in that: The first insulating member is disposed around the first electrode assembly about an axis extending in a thickness direction of the first wall.

6. The battery cell according to claim 4, characterized in that: The first insulating member is bonded to the first electrode assembly.

7. The battery cell according to claim 1, characterized in that: Along the thickness direction of the first wall, the housing has a second wall arranged opposite to the first wall, and a liquid injection hole is arranged on the second wall, and the liquid injection hole is communicated with the accommodating cavity.

8. The battery cell according to claim 1, characterized in that: Along the thickness direction of the first wall, the housing has a second wall arranged opposite to the first wall; The battery cell further includes a second insulating member, which is disposed on a side of the second wall facing the first electrode assembly, and the second insulating member is configured to insulate and isolate the second wall from the first electrode assembly; Wherein, one end of the receiving member facing the second wall in the thickness direction of the first wall is connected to the second insulating member.

9. The battery cell according to claim 8, characterized in that: The receiving member is thermally melt-connected to the second insulating member.

10. The battery cell according to claim 8, characterized in that: The accommodating cavity is formed with a first opening at one end close to the second wall in the thickness direction of the first wall, and the second insulating member closes the first opening.

11. The battery cell according to claim 1, characterized in that: The receiving element comprises: Two diaphragms are arranged along a first direction, and the two diaphragms are together enclosed to form the accommodation cavity; Among them, the diaphragm forms a first connection area at one end close to the first wall in the thickness direction of the first wall, the first connection areas of the two diaphragms are stacked and connected, the two ends of the diaphragm in the second direction respectively form two second connection areas, the second connection areas of the two diaphragms are correspondingly stacked and connected, and the thickness direction of the first wall, the first direction and the second direction are perpendicular to each other.

12. The battery cell according to claim 11, characterized in that: The first connection areas of the two membranes are connected by heat melting; and / or The second connection areas of the two membranes are connected by heat melting.

13. The battery cell according to claim 11, characterized in that: The first electrode assembly includes a first body and a first electrode tab connected to each other, the second electrode assembly includes a second body and a second electrode tab connected to each other, the second body and the first body are arranged along the thickness direction of the first wall, and the first electrode tab is electrically connected to the second electrode tab; The battery cell further includes a mounting frame, the mounting frame being accommodated in the housing and being located outside the receiving member, and being disposed between the first body and the second body along a thickness direction of the first wall, the mounting frame being configured to separate the first body and the second body; Wherein, the mounting frame is provided with an avoidance groove on one side facing the first main body in the thickness direction of the first wall, and the avoidance groove is used to accommodate the first connection areas of the two diaphragms.

14. The battery cell according to claim 1, characterized in that: The receiving piece is made of insulating material.

15. The battery cell according to claim 1, characterized in that: The first electrode assembly and the second electrode assembly are both wound structures formed by winding around an axis extending in the thickness direction of the first wall.

16. The battery cell according to claim 15, characterized in that: The length direction of the shell is consistent with the thickness direction of the first wall. The length of the shell is L, and L≥200 mm.

17. The battery cell according to claim 16, characterized in that: L≥250mm.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The first electrode assembly and the second electrode assembly are electrically connected.

19. The battery cell according to claim 18, characterized in that: The first electrode assembly includes a first body and a first electrode tab, the second electrode assembly includes a second body and a second electrode tab, and the second body and the first body are arranged along the thickness direction of the first wall; Among them, along the thickness direction of the first wall, the first pole ear is arranged at one end of the first body facing the second body, and the second pole ear is arranged at one end of the second body facing the first body, and the second pole ear is connected to the first pole ear to electrically connect the first electrode assembly and the second electrode assembly.

20. The battery cell according to claim 19, characterized in that: The battery cell further comprises: A transition piece connects the first pole ear and the second pole ear, wherein the first pole ear is located in the accommodating cavity, and the second pole ear is located outside the receiving piece, and a channel for the transition piece to pass through is provided at one end of the receiving piece close to the second body in the thickness direction of the first wall.

21. The battery cell according to claim 20, characterized in that: The battery cell further comprises: A sealing member is disposed between the adapter and the receiving member, and is configured to seal a gap between the adapter and the receiving member.

22. The battery cell according to claim 20, characterized in that: The receiving element comprises: Two diaphragms are arranged along a first direction, and the two diaphragms are together enclosed to form the accommodation cavity; The diaphragm forms a first connection area at one end close to the first wall in the thickness direction of the first wall, the first connection areas of two diaphragms are stacked and connected, and the channel is formed between the first connection areas of the two diaphragms.

23. The battery cell according to claim 20, characterized in that: The battery cell further comprises: A mounting frame, contained in the housing and located outside the receiving member, disposed between the first body and the second body along the thickness direction of the first wall, and configured to separate the first body and the second body; The mounting frame is provided with an avoidance hole, the avoidance hole penetrates the mounting frame along the thickness direction of the first wall, and the adapter and the second pole lug are both inserted into the avoidance hole.

24. The battery cell according to claim 23, characterized in that: The mounting frame includes a first frame body and a second frame body that are detachably connected to each other, the first frame body and the second frame body are arranged along a first direction, and the first frame body and the second frame body together enclose the avoidance hole, and the first direction is perpendicular to the thickness direction of the first wall.

25. The battery cell according to claim 24, characterized in that: A first groove is provided on the side of the first frame body facing the second frame body, and the first groove penetrates the first frame body along the thickness direction of the first wall. A second groove is provided on the side of the second frame body facing the first frame body, and the second groove penetrates the second frame body along the thickness direction of the first wall. The second groove and the first groove enclose the avoidance hole.

26. The battery cell according to claim 24, characterized in that: A clamping portion is disposed on a side of the first frame body facing the second frame body, and a clamping hole is disposed on a side of the second frame body facing the first frame body, wherein the clamping portion is clamped into the clamping hole.

27. The battery cell according to claim 23, characterized in that: The first pole lug includes a first root portion and a first pole lug portion, the first root portion connects the first pole lug portion and the first body, and the first pole lug portion is connected to the adapter; Among them, along the thickness direction of the first wall, a first accommodating groove is provided on the side of the mounting frame facing the first main body, the first accommodating groove is used to accommodate the first root portion, and the avoidance hole passes through the bottom surface of the first accommodating groove.

28. The battery cell according to claim 27, characterized in that: Along the thickness direction of the first wall, the first root portion has a first surface away from the first main body, the first pole ear portion is protruded from the first surface, and the first surface is matched with the bottom surface of the first accommodating groove.

29. The battery cell according to claim 23, characterized in that: The second pole lug comprises a second root portion and a second pole lug portion, the second root portion connects the second pole lug portion and the second body, the second pole lug portion is inserted into the avoidance hole, and the second pole lug portion is connected to the adapter; Among them, along the thickness direction of the first wall, a second accommodating groove is provided on the side of the mounting frame facing the second main body, the second accommodating groove is used to accommodate the second root portion, and the avoidance hole passes through the bottom surface of the second accommodating groove.

30. The battery cell according to claim 29, characterized in that Along the thickness direction of the first wall, the second root portion has a second surface away from the second body, the second pole ear portion is protruded from the second surface, and the second surface is matched with the bottom surface of the second accommodating groove.

31. The battery cell according to claim 23, characterized in that: The mounting frame is provided with a second through hole, the second through hole penetrates the mounting frame along the thickness direction of the first wall, and the second through hole is configured to allow electrolyte to pass through.

32. The battery cell according to claim 31, characterized in that The mounting frame is provided with a plurality of the second through holes.

33. The battery cell according to claim 31, characterized in that A cavity is formed inside the mounting frame, and the cavity is communicated with the second through hole.

34. The battery cell according to claim 23, characterized in that: The battery cell further comprises: A connecting member connects the mounting frame, the receiving member and the second body.

35. The battery cell according to claim 34, characterized in that: The connecting member is bonded to the mounting frame, the receiving member and the second body.

36. The battery cell according to claim 34, characterized in that The connecting member surrounds the outer sides of the mounting frame, the receiving member and the second body around an axis extending in the thickness direction of the first wall.

37. The battery cell according to claim 36, characterized in that: A first through hole is provided on the outer peripheral surface of the receiving member, and the first through hole is connected to the receiving cavity; Wherein, the projection of the first through hole in the axial direction thereof does not overlap with the connecting member.

38. The battery cell according to claim 19, characterized in that The first electrode assembly includes two first electrode tabs, the two first electrode tabs have opposite polarities and are both arranged at one end of the first body facing the second body; The second electrode assembly includes two second electrode tabs, the two second electrode tabs have opposite polarities and are both arranged at one end of the second body facing the first body; The first electrode tab and the second electrode tab having the same polarity are connected.

39. The battery cell according to claim 38, characterized in that Along the thickness direction of the first wall, the housing has a second wall arranged opposite to the first wall; The battery cell further comprises two electrode terminals, both of which are insulated and mounted on the second wall, and the electrode terminals are used to output or input electrical energy of the battery cell; The first electrode assembly further includes two third pole tabs, which have opposite polarities and are arranged at one end of the first body facing the second wall along the thickness direction of the first wall, and the two third pole tabs are respectively connected to the two electrode terminals.

40. The battery cell according to claim 1, characterized in that The battery cell further comprises: A third insulating member is wrapped around an axis extending along the thickness direction of the first wall and covers the outer side of the receiving member and the second electrode assembly, and the insulating member is configured to insulate and isolate the second electrode assembly from the outer shell.

41. The battery cell according to claim 1, characterized in that The housing comprises: A shell, comprising an integrally formed side wall and the first wall, wherein the side wall is disposed around the first wall, and along the thickness direction of the first wall, one end of the side wall is connected to the first wall, and the other end is enclosed to form a second opening, and the side wall and the first wall jointly define an accommodation space for accommodating the first electrode assembly and the second electrode assembly; The end cover closes the second opening.

42. The battery cell according to claim 1, characterized in that The housing comprises: A housing having a second opening formed therein, wherein the housing is used to accommodate the first electrode assembly and the second electrode assembly; an end cover for closing the second opening; Wherein, the end cover is the first wall.

43. A battery, characterized in that: Comprising a battery cell as described in any one of claims 1-42.

44. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 42, wherein the battery cell is used to provide electrical energy.

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