Battery monomer, battery and electric device

Abstract

The utility model 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, an electrode terminal, an electrode assembly and a first insulating part, the shell is provided with a wall part and a side wall, and the side wall is arranged around the wall part in a surrounding mode. The electrode terminal is provided on the wall portion. The electrode assembly is contained in the shell, a first tab is formed at one end, close to the wall part, of the electrode assembly, and the first tab is electrically connected with the electrode terminal. The first insulating part comprises a first insulating part and a second insulating part which are connected with each other, the first insulating part is located between the wall part and the first tab, the second insulating part is arranged around the first insulating part, and the second insulating part and the first insulating part jointly define an accommodating space; and at least part of the first tab is inserted into the accommodating space along the thickness direction of the wall part. A groove is formed in the inner circumferential surface of the side wall, and one end, far away from the first insulating part, of the second insulating part is inserted into the groove, so that the phenomenon that the second insulating part scratches the electrode assembly or is inserted into the electrode assembly is relieved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cell, a battery and an electrical device. Background Art

[0002] New energy vehicles have witnessed a leapfrog development. In the field of electric vehicles, the power battery, as the power source of the electric vehicle, plays an irreplaceable and important role. With the strong promotion of new energy vehicles, the demand for power battery products is also increasing day by day. Among them, the battery, as the core component of new energy vehicles, has high requirements in terms of service performance and production quality.

[0003] In battery technology, a battery cell includes a housing and an electrode assembly accommodated in the housing. The electrode assembly is formed with a tab, and the tab is used for electrically connecting to an electrode terminal provided on the housing to achieve the input or output of electrical energy of the battery cell. However, in the assembly process of the existing battery cell, the electrode assembly is prone to be damaged, resulting in poor assembly quality and low use stability of the battery cell. Summary of the Utility Model

[0004] Embodiments of the present application provide a battery cell, a battery and an electrical device, which can effectively improve the assembly quality and use stability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including a housing, an electrode terminal, an electrode assembly and a first insulating member; the housing has a wall portion and a side wall, and the side wall surrounds the wall portion; the electrode terminal is provided on the wall portion; the electrode assembly is accommodated in the housing, the electrode assembly has a first tab, the first tab is provided at one end of the electrode assembly close to the wall portion in the thickness direction of the wall portion, and the first tab is electrically connected to the electrode terminal; the first insulating member includes a first insulating portion and a second insulating portion, at least part of the first insulating portion is located between the wall portion and the first tab, the second insulating portion surrounds the first insulating portion, the second insulating portion and the first insulating portion jointly define an accommodating space, along the thickness direction of the wall portion, one end of the second insulating portion is connected to the first insulating portion, and at least part of the first tab is inserted into the accommodating space; wherein, a groove is provided on the inner peripheral surface of the side wall, and one end of the second insulating portion away from the first insulating portion is inserted into the groove.

[0006] In the above technical solution, a first insulating member for insulating and isolating the first tab from the outer shell is provided inside the outer shell. The first insulating member includes a first insulating portion and a second insulating portion. The first insulating portion is disposed between the wall portion and the first tab, and the second insulating portion surrounds the first insulating portion. One end of the second insulating portion in the thickness direction of the wall portion is connected to the first insulating portion, so that the first insulating portion and the second insulating portion together form a receiving space for inserting the first tab, and the first tab is separated from the wall portion and the side wall through the first insulating portion and the second insulating portion of the first insulating member respectively, which is beneficial to improving the effect of the first insulating member in insulating and isolating the first tab from the outer shell, thereby reducing the short-circuit risk of the battery cell and improving the use reliability of the battery cell. Among them, by providing a groove on the inner circumferential surface of the side wall and inserting one end of the second insulating portion far from the first insulating portion into the groove, the interference effect between the second insulating portion and the electrode assembly can be reduced, so that the phenomenon of the second insulating portion squeezing or scraping the electrode assembly can be alleviated during the use of the battery cell, and the phenomenon that one end of the second insulating portion far from the first insulating portion is inserted into the electrode assembly can be alleviated during the assembly of the battery cell, which is beneficial to reducing the risk of damage to the electrode assembly and improving the assembly quality and use stability of the battery cell.

[0007] In some embodiments, the electrode assembly includes a first electrode tab, the first electrode tab includes a first main body and the first tab, and the first tab is connected to one end of the first main body close to the wall portion in the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, one end of the second insulating portion far from the first insulating portion extends between the first main body and the side wall, and the first tab is entirely located within the receiving space.

[0008] In the above technical solution, by extending one end of the second insulating portion far from the first insulating portion between the first main body of the first electrode tab and the side wall, the first tab can be entirely received within the receiving space, so that the projection of the first tab in the radial direction of the second insulating portion is located within the second insulating portion. Since one end of the second insulating portion far from the first insulating portion is inserted into the groove, that is, one end of the second insulating portion extending between the first main body and the side wall is inserted into the groove, the battery cell with this structure can further improve the effect of the first insulating member in insulating and isolating the first tab from the side wall while alleviating the phenomenon that one end of the second insulating portion far from the first insulating portion is inserted into the electrode assembly or scraping and damaging the electrode assembly, so as to further reduce the short-circuit risk of the battery cell.

[0009] In some embodiments, the groove is an annular groove extending along the circumferential direction of the side wall.

[0010] In the above technical solution, by setting the groove as an annular groove structure extending along the circumferential direction of the side wall, both the groove and the second insulating portion are annular structures, so that one end of the second insulating portion away from the first insulating portion can be inserted into the groove, which is beneficial to reducing the assembly difficulty between the second insulating portion and the groove, and improving the assembly efficiency of the battery cell.

[0011] In some embodiments, the wall thickness of the side wall is D1, and the groove depth of the groove is H, satisfying 1 / 3 ≤ H / D1 ≤ 1 / 2.

[0012] In the above technical solution, the ratio of the groove depth of the groove to the wall thickness of the side wall is from one-third to one-half. On the one hand, by setting the groove depth of the groove to be greater than or equal to one-third of the wall thickness of the side wall, the phenomenon that the depth of the groove provided on the inner circumferential surface of the side wall is too large can be alleviated, so that the wall thickness of the bottom wall of the groove can be increased, which is beneficial to improving the structural strength of the area of the side wall provided with the groove, and alleviating the phenomenon such as fracture or damage of the side wall during use. On the other hand, by setting the groove depth of the groove to be less than or equal to one-half of the wall thickness of the side wall, it is beneficial to increase the spatial dimension of the groove for accommodating one end of the second insulating portion away from the first insulating portion, so that the effect of the groove accommodating one end of the second insulating portion away from the first insulating portion can be improved, effectively alleviating the phenomenon that the second insulating portion squeezes or scratches the electrode assembly during the use of the battery cell, and effectively alleviating the phenomenon that one end of the second insulating portion away from the first insulating portion is inserted into the electrode assembly during the assembly of the battery cell, and further being beneficial to reducing the risk of damage to the electrode assembly.

[0013] In some embodiments, the outer peripheral surface of the second insulating portion is in interference fit with the bottom surface of the groove.

[0014] In the above technical solution, by setting the outer peripheral surface of the second insulating portion and the bottom surface of the groove to be in an interference fit structure, the first insulating member is fixed in the housing, so that the stability of the first insulating member assembled into the housing can be improved, which is beneficial to alleviating the phenomenon such as crosstalk or displacement of the first insulating member during use, and improving the use reliability of the battery cell.

[0015] In some embodiments, along the thickness direction of the wall portion, a notch is provided at one end of the second insulating portion away from the first insulating portion, and the notch penetrates the inner peripheral surface and the outer peripheral surface of the second insulating portion.

[0016] In the above technical solution, a notch is provided at one end of the second insulating part away from the first insulating part in the thickness direction of the wall, and the notch is a structure that penetrates the inner circumference and the outer circumference of the second insulating part, so that the second insulating part is more easily deformed in the radial direction of the second insulating part, so as to facilitate the assembly of the first insulating part into the outer shell, thereby reducing the difficulty of interference fit between the second insulating part and the bottom surface of the groove, thereby reducing the difficulty of assembling the first insulating part into the outer shell, which is beneficial to improving the assembly efficiency of the battery cell.

[0017] In some embodiments, the second insulating portion is provided with a plurality of the notches, and the plurality of the notches are arranged at intervals along the circumference of the second insulating portion.

[0018] In the above technical solution, a plurality of notches arranged at intervals along the circumference of the second insulating part are provided on the second insulating part to further enhance the deformation capacity of the second insulating part in the radial direction of the second insulating part, thereby further reducing the difficulty of interference fit between the second insulating part and the bottom surface of the groove, thereby further reducing the difficulty of assembling the first insulating part into the outer shell.

[0019] In some embodiments, the electrode assembly includes a first pole piece, a second pole piece and an isolation membrane, the first pole piece and the second pole piece have opposite polarities, the first pole piece includes a first main body and the first pole ear, the first pole ear is connected to one end of the first main body close to the wall portion in the thickness direction of the wall portion, a portion of the isolation membrane is arranged between the first pole piece and the second pole piece to separate the first pole piece and the second pole piece, and a portion of the isolation membrane is covered on the outside of the electrode assembly; wherein, along the radial direction of the second insulating portion, the projection of the notch is located in the portion of the isolation membrane covering the outside of the electrode assembly, and the radial direction of the second insulating portion is perpendicular to the thickness direction of the wall portion.

[0020] In the above technical scheme, part of the isolation membrane used to separate the first pole piece and the second pole piece surrounds and covers the outer side of the electrode assembly, so that the isolation membrane can also play the role of insulating and isolating the first pole piece and the side wall of the outer shell and the second pole piece and the side wall of the outer shell. By setting the projection of the notch on the second insulating portion in the radial direction of the second insulating portion to be located within the portion of the isolation membrane covering the outer side of the electrode assembly, so that the portion of the isolation membrane covering the outer side of the electrode assembly is a structure that covers and blocks the notch in the radial direction of the second insulating portion, thereby reducing the phenomenon of the first pole ear leaking out of the notch and overlapping with the side wall of the outer shell, thereby reducing the risk of internal short circuit in the battery cell, and further helping to improve the reliability of the battery cell.

[0021] In some embodiments, the electrode assembly includes a first electrode tab, a second electrode tab, and a separator. The polarities of the first electrode tab and the second electrode tab are opposite. The first electrode tab includes a first main body and the first tab ear. The first tab ear is connected to one end of the first main body close to the wall portion in the thickness direction of the wall portion. A part of the separator is disposed between the first electrode tab and the second electrode tab to separate the first electrode tab and the second electrode tab, and a part of the separator is coated on the outer side of the electrode assembly. Wherein, along the thickness direction of the wall portion, the first tab ear extends beyond one end of the separator close to the wall portion, and one end of the part of the separator coated on the outer side of the electrode assembly close to the wall portion is inserted into the accommodation space.

[0022] In the above technical solution, by setting the first tab ear to extend beyond one end of the separator close to the wall portion in the thickness direction of the wall portion, it is convenient for the first tab ear to be electrically connected to the electrode terminal, which is beneficial to reducing the assembly difficulty between the first tab ear and the electrode terminal, and can reduce the risk of damaging the separator when the first tab ear and the electrode terminal are assembled and connected to each other. In addition, by setting the part of the separator coated on the outer side of the electrode assembly to be inserted into the accommodation space of the first insulating member in the thickness direction of the wall portion, a part of the second insulating portion and a part of the separator can overlap each other in the radial direction of the second insulating portion, so as to improve the insulating and isolating effect of the second insulating portion of the first insulating member and the separator on the side walls of the first electrode tab and the housing and the side walls of the second electrode tab and the housing, so as to reduce the risk of the exposed part of the first tab ear overlapping with the side wall of the housing. On the one hand, the use reliability of the battery cell can be further improved, and on the other hand, there is no need to further coat an insulating film or other structures on the outer side of the electrode assembly, which is beneficial to reducing the manufacturing cost of the battery cell and is beneficial to optimizing the production process of the battery cell.

[0023] In some embodiments, the battery cell further includes a first current collector member. The first current collector member is disposed between the first tab ear and the first insulating portion along the thickness direction of the wall portion. The first current collector member is connected to the first tab ear. The first insulating portion is provided with a through hole, and the through hole is communicated with the accommodation space. The electrode terminal is inserted into the through hole and connected to the first current collector member.

[0024] In the above technical solution, a first current collecting member is further disposed inside the outer casing. The first current collecting member is disposed between the first insulating portion and the first tab. The first insulating portion is provided with a through hole for inserting a power supply terminal, so that the first current collecting member can connect the electrode terminal and the first tab. On the one hand, the battery cell adopting this structure can reduce the difficulty of electrically connecting the electrode terminal and the first tab, so as to reduce the assembly difficulty of the battery cell. On the other hand, the first current collecting member is also located in the accommodation space of the first insulating member, so that the first insulating member can insulate and isolate the first tab and the outer casing while also insulating and isolating the first current collecting member and the outer casing, which is beneficial to reducing the short-circuit risk between the current collecting member and the outer casing, and further reducing the short-circuit risk of the battery cell, so as to further improve the use reliability of the battery cell.

[0025] In some embodiments, the first insulating portion is connected to the first current collecting member.

[0026] In the above technical solution, by connecting the first insulating portion of the first insulating member to the first current collecting member, the first insulating member is fixed to the first current collecting member. On the one hand, the battery cell adopting this structure can improve the stability of the first insulating member assembled into the outer casing, which is beneficial to alleviating phenomena such as crosstalk or displacement of the first insulating member during use, so as to improve the use reliability of the battery cell. On the other hand, it can realize that after the first insulating member, the first current collecting member and the electrode assembly are assembled, the formed whole is assembled into the outer casing, so as to reduce the assembly deviation between the first insulating member and the electrode assembly, and further improve the assembly quality between the first insulating member and the electrode assembly, and reduce the risk of the first insulating member damaging the electrode assembly during the process of assembling the electrode assembly into the outer casing, which is beneficial to improving the production quality of the battery cell.

[0027] In some embodiments, the first insulating portion is adhesively connected to the first current collecting member.

[0028] In the above technical solution, the first insulating portion of the first insulating member is connected to the first current collecting member by an adhesive connection structure. On the one hand, it can reduce the connection difficulty between the first insulating member and the first current collecting member, so as to improve the assembly efficiency of the battery cell. On the other hand, it can realize that the connection and assembly between the first insulating member and the first current collecting member do not affect the first current collecting member, which is beneficial to reducing the phenomenon of damage to the first current collecting member.

[0029] In some embodiments, the battery cell further includes a second insulating member; at least a part of the second insulating member is disposed between the wall portion and the first insulating portion, and the second insulating member is configured to insulatively isolate the first current collecting member and the wall portion; wherein, along the thickness direction of the wall portion, a limiting portion protrudes from a side of the second insulating member facing away from the wall portion, and the limiting portion is inserted into the through hole, and the limiting portion is located between the electrode terminal and the hole wall surface of the through hole.

[0030] In the above technical solution, a second insulating member is further disposed in the outer casing, and at least a part of the second insulating member is located between the wall portion and the first insulating portion, so that the wall portion and the first current collecting member can be further partitioned by the second insulating member, thereby further improving the effect of mutual insulation and isolation between the wall portion and the first current collecting member. Among them, by protruding a limiting portion from a side of the second insulating member facing away from the wall portion, and inserting the limiting portion into the through hole of the first insulating portion, the limiting portion of the second insulating member can further play a role in limiting and positioning the first insulating member, which is beneficial to further reducing the phenomenon of the first insulating member moving or shifting during use, and improving the stability and quality of the assembly of the first insulating member into the outer casing.

[0031] In some embodiments, the limiting portion is disposed around the electrode terminal.

[0032] In the above technical solution, by setting the limiting portion as an annular structure disposed around the electrode terminal, the limiting portion is an annular structure extending along the circumferential direction of the hole wall surface of the through hole, which is beneficial to further improving the effect of the limiting portion of the second insulating member in limiting and positioning the first insulating member, and thus can further improve the assembly quality between the first insulating member and the second insulating member.

[0033] In some embodiments, the second insulating member is fixedly connected to the first insulating member.

[0034] In the above technical solution, by fixedly connecting the first insulating member and the second insulating member, it is beneficial to improve the structural stability of the assembly of the first insulating member and the second insulating member into the outer casing, and can further reduce the phenomenon of the first insulating member moving or shifting during use.

[0035] In some embodiments, the battery cell further includes a second insulating member; the second insulating member is disposed on a side of the wall portion facing the electrode assembly along the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, at least a part of the first insulating portion is located between the second insulating member and the wall portion.

[0036] In the above technical solution, the second insulating member is disposed on the side of the wall portion facing the electrode assembly, and at least a part of the first insulating portion of the first insulating member is located between the second insulating member and the wall portion, so that the second insulating member and the wall portion can also cooperate to assemble the first insulating portion, so as to fasten the first insulating member in the housing. On the one hand, the battery cell adopting this structure can improve the stability of the first insulating member assembled in the housing, which is beneficial to alleviating phenomena such as crosstalk or displacement of the first insulating member during use, so as to improve the use reliability of the battery cell, and can reduce the difficulty of fastening the first insulating member in the housing, so as to reduce the assembly difficulty of the battery cell. On the other hand, the first insulating member can be fixed in the housing by the second insulating member first, so that the risk of damaging the electrode assembly due to the displacement of the first insulating member during the assembly of the electrode assembly to the housing can be reduced, which is beneficial to improving the production quality of the battery cell.

[0037] In some embodiments, the battery cell further includes a first current collecting member; the first current collecting member is disposed between the first tab and the wall portion, and the first current collecting member connects the electrode terminal and the first tab; wherein, along the thickness direction of the wall portion, the second insulating member is located between the wall portion and the first current collecting member, and the second insulating member is further configured to insulate and isolate the wall portion and the first current collecting member.

[0038] In the above technical solution, a first current collecting member is further disposed in the housing. The first current collecting member is disposed between the first tab and the wall portion, so that the first current collecting member can connect the electrode terminal and the first tab, which is beneficial to reducing the difficulty of electrically connecting the electrode terminal and the first tab to each other. In addition, by disposing the first current collecting member on the side of the second insulating member facing away from the wall portion, a second insulating member is disposed between the first current collecting member and the wall portion, and the first current collecting member can also be located in the accommodation space of the first insulating member. Thus, while the first insulating member insulates and isolates the first tab and the housing, the first insulating member and the second insulating member can also insulate and isolate the first current collecting member and the housing, which is beneficial to reducing the short-circuit risk between the first current collecting member and the housing, and further reducing the short-circuit risk of the battery cell, so as to further improve the use reliability of the battery cell.

[0039] In some embodiments, the second insulating member is fixedly connected to the first insulating member.

[0040] In the above technical solution, by fixedly connecting the first insulating member and the second insulating member, on the one hand, the structural stability of the first insulating member disposed between the wall portion and the second insulating member can be further improved to further reduce the phenomenon of the first insulating member moving or shifting during use. On the other hand, it is convenient to first fixedly assemble the first insulating member and the second insulating member and then assemble them together into the housing, which is beneficial to reducing the difficulty of assembling the first insulating member between the second insulating member and the wall portion, and can relieve the phenomenon of the first insulating member shaking or shifting during the assembly process of the first insulating member, which is beneficial to improving the assembly quality of the first insulating member.

[0041] In some embodiments, an installation hole is provided on the wall portion, and the installation hole penetrates the wall portion along the thickness direction of the wall portion, and a part of the electrode terminal is disposed in the installation hole; wherein, the electrode terminal has a first clamping portion, and along the thickness direction of the wall portion, the first clamping portion is located on a side of the wall portion facing the electrode assembly, and at least a part of the first insulating portion is disposed between the wall portion and the first clamping portion to insulate and isolate the wall portion and the first clamping portion.

[0042] In the above technical solution, the electrode terminal has a first clamping portion located on a side of the wall portion facing the electrode assembly in the thickness direction of the wall portion, and at least a part of the first insulating portion of the first insulating member is located between the first clamping portion and the wall portion, so that the first clamping portion and the wall portion can also cooperate to assemble the first insulating portion to fasten the first insulating member in the housing. For a battery cell adopting this structure, on the one hand, the first insulating member can insulate and isolate the first clamping portion and the wall portion while realizing the insulation and isolation between the first tab and the housing, so that there is no need to separately provide an insulating component between the first clamping portion and the wall portion, which is beneficial to reducing the manufacturing cost of the battery cell. On the other hand, it can improve the stability of the first insulating member assembled in the housing, which is beneficial to relieving the phenomena such as the first insulating member moving or shifting during use, so as to improve the use reliability of the battery cell.

[0043] In some embodiments, the battery cell further includes a sealing member; at least a part of the sealing member is located between the wall portion and the first clamping portion, and the sealing member abuts against the first insulating portion.

[0044] In the above technical solution, by disposing at least a part of the seal between the wall portion and the first clamping portion, while the seal plays a sealing role, on the one hand, the first clamping portion and the wall portion can also clamp the seal to improve the structural stability and reliability of the seal assembled between the electrode terminal and the hole wall surface of the mounting hole. On the other hand, by setting the seal and the first insulating portion to be in mutual abutment, the phenomenon of gaps appearing between the seal and the first insulating portion is reduced, which is beneficial to improving the effect of the first insulating portion and the seal cooperating to insulate and isolate the first clamping portion and the wall portion, and further reducing the risk of short circuit between the first clamping portion and the wall portion, so as to improve the use reliability of the battery cell.

[0045] In some embodiments, the Rockwell hardness of the second insulating portion is less than the Rockwell hardness of the outer shell.

[0046] In the above technical solution, by setting the Rockwell hardness of the second insulating portion to be less than the Rockwell hardness of the outer shell, the phenomenon of scratching or abrasion of the outer shell caused by the second insulating portion during the process of being assembled into the outer shell is alleviated, which is beneficial to reducing the risk of wire drawing or burrs on the outer shell, so as to improve the production quality of the battery cell.

[0047] In some embodiments, along the thickness direction of the wall portion, at least part of the radial dimension of the outer peripheral surface of the second insulating portion gradually decreases from the end far from the first insulating portion to the end close to the first insulating portion.

[0048] In the above technical solution, by setting at least part of the radial dimension of the outer peripheral surface of the second insulating portion to gradually decrease from the end far from the first insulating portion to the end close to the first insulating portion, the outer peripheral surface of the second insulating portion can play a certain guiding role during the process of the second insulating portion of the first insulating member being assembled into the outer shell, which is beneficial to reducing the difficulty of mutual assembly between the second insulating portion and the outer shell, and thus improving the assembly efficiency of the battery cell.

[0049] In some embodiments, along the thickness direction of the wall portion, the thickness of the first insulating portion is greater than or equal to 0.3 mm and less than or equal to 1.2 mm.

[0050] In the above technical solution, the thickness of the first insulating portion of the first insulating member is from 0.3 mm to 1.2 mm. On the one hand, by setting the thickness of the first insulating portion to be greater than or equal to 0.3 mm, the structural strength of the first insulating portion is improved, which is beneficial to enhancing the effect of the first insulating portion in insulating and isolating the first tab and the housing, and is also beneficial to alleviating phenomena such as damage or warping of the first insulating portion during use, so as to effectively improve the stability and reliability of the first insulating portion in insulating and isolating the first tab and the housing. On the other hand, by setting the thickness of the first insulating portion to be less than or equal to 1.2 mm, the phenomenon that the first insulating portion occupies too much space in the housing is alleviated, so that the space utilization rate inside the housing can be improved to enhance the energy density of the battery cell.

[0051] In some embodiments, the thickness of the second insulating portion is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0052] In the above technical solution, the thickness of the second insulating portion of the first insulating member is from 0.05 mm to 0.5 mm. On the one hand, by setting the thickness of the second insulating portion to be greater than or equal to 0.05 mm, the structural strength of the second insulating portion is improved, which is beneficial to enhancing the effect of the second insulating portion in insulating and isolating the first tab and the housing, and is also beneficial to alleviating phenomena such as damage or warping of the second insulating portion during use, so as to effectively improve the stability and reliability of the second insulating portion in insulating and isolating the first tab and the housing. On the other hand, by setting the thickness of the second insulating portion to be less than or equal to 0.5 mm, the phenomenon that the second insulating portion occupies too much space in the housing is alleviated, so that the space utilization rate inside the housing can be improved to enhance the energy density of the battery cell.

[0053] In some embodiments, the first insulating portion and the second insulating portion are integrally formed.

[0054] In the above technical solution, by setting the first insulating portion and the second insulating portion of the first insulating member to be an integrally formed structure, the first insulating portion and the second insulating portion are an integral structure, so that the connection strength between the first insulating portion and the second insulating portion can be enhanced to reduce the phenomenon that the first insulating portion and the second insulating portion are separated from each other, which is beneficial to enhancing the stability and reliability of the first insulating member during use.

[0055] In some embodiments, along the thickness direction of the wall portion, the thickness of the second insulating portion gradually increases from the end far from the first insulating portion to the end close to the first insulating portion.

[0056] In the above technical solution, by setting the thickness of the second insulating part to gradually increase from the end far from the first insulating part to the end close to the first insulating part, the second insulating part has a larger thickness at the end connected to the first insulating part. On the one hand, this is beneficial to improving the connection reliability between the second insulating part and the first insulating part and to enhancing the overall structural stability of the first insulating member. On the other hand, it can reduce the forming difficulty of the first insulating part and the second insulating part, so as to reduce the manufacturing difficulty of the first insulating member.

[0057] In some embodiments, the side wall is cylindrical, and the central axis of the side wall extends along the thickness direction of the wall part.

[0058] In the above technical solution, by setting the side wall of the outer shell to be cylindrical, the outer shell is made cylindrical, which is convenient for processing a battery cell with a cylindrical structure, so that the battery cell has advantages such as high capacity, long cycle life, and a wide operating temperature range. In addition, by setting the outer shell to be cylindrical, the electrode assembly can be set as a cylindrical structure with its central axis extending along the thickness direction of the wall part, which is convenient for inserting the first tab of the electrode assembly into the accommodation space of the first insulating member and can reduce the manufacturing difficulty of the first insulating member.

[0059] In some embodiments, the outer shell includes a housing and an end cap; the housing includes the side wall and the bottom wall integrally formed, the side wall surrounds the bottom wall, along the thickness direction of the wall part, one end of the side wall is connected to the bottom wall, and the other end encloses an opening, the side wall and the bottom wall jointly define an accommodation cavity, and the electrode assembly is accommodated in the accommodation cavity; the end cap closes the opening; wherein, the bottom wall is the wall part; or, the end cap is the wall part.

[0060] In the above technical solution, by setting the wall part of the outer shell to be the bottom wall of the housing opposite to the end cap in the thickness direction of the wall part, the battery cell with this structure can make the wall part provided with the electrode terminal far from the end cap, so that there is no direct connection relationship between the wall part and the end cap, thereby being able to relieve the force generated when the electrode terminal and other components pull or twist the wall part from acting on the end cap, so as to reduce the risk of connection failure between the end cap and the housing, and further being beneficial to reducing the risk of liquid leakage during the use of the battery cell. Similarly, by setting the wall part of the outer shell to be the end cap for closing the opening of the housing, the battery cell with this structure is convenient for assembling the electrode terminal on the end cap and for electrically connecting the electrode terminal to the first tab, which is beneficial to reducing the assembly difficulty of the battery cell and to improving the production efficiency of the battery cell.

[0061] In a second aspect, an embodiment of the present application further provides a battery, including the above battery cell.

[0062] In a third aspect, an embodiment of the present application further provides an electrical device, including the above-mentioned battery cell, and the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0064] Figure 1 Structural schematic diagram of a vehicle provided in some embodiments of the present application;

[0065] Figure 2 Exploded view of the structure of a battery provided in some embodiments of the present application;

[0066] Figure 3 Structural schematic diagram of a battery cell provided in some embodiments of the present application;

[0067] Figure 4 Exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0068] Figure 5 Cross-sectional view of a battery cell provided in some embodiments of the present application;

[0069] Figure 6 For Figure 5 Partial enlarged view of the A position of the battery cell shown;

[0070] Figure 7 Structural schematic diagram of a first insulating member provided in some embodiments of the present application;

[0071] Figure 8 Cross-sectional view of a first insulating member provided in some embodiments of the present application;

[0072] Figure 9 Cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0073] Figure 10 For Figure 9 Partial enlarged view of the B position of the battery cell shown;

[0074] Figure 11 Cross-sectional view of a battery cell provided in some further embodiments of the present application;

[0075] Figure 12 For Figure 11 Partial enlarged view of the C position of the battery cell shown.

[0076] Icons: 1000 - vehicle; 100 - battery; 10 - box body; 11 - first box body; 12 - second box body; 20 - battery cell; 21 - housing; 211 - wall portion; 2111 - mounting hole; 212 - shell; 2121 - opening; 2122 - bottom wall; 2123 - side wall; 2123a - groove; 213 - end cap; 22 - electrode terminal; 221 - first clamping portion; 222 - second clamping portion; 23 - electrode assembly; 231 - main body portion; 232 - first tab; 233 - second tab; 234 - separator; 24 - first insulating member; 241 - first insulating portion; 2411 - through hole; 242 - second insulating portion; 2421 - notch; 243 - accommodating space; 25 - second insulating member; 251 - limiting portion; 26 - third insulating member; 27 - seal; 28 - first current collecting member; 29 - second current collecting member; 30 - adhesive layer; 200 - controller; 300 - motor; X - thickness direction of the wall portion; Y - radial direction of the second insulating portion. Detailed implementation manners

[0077] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts fall within the scope of protection of the present application.

[0078] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0079] Referring to "embodiments" in the present application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0080] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "linked", 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, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0081] The term "and / or" in the present application is merely a relational description of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0082] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings in the embodiments of the present application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only illustrative and should not constitute any limitation to the present application.

[0083] The term "a plurality of" as used in the present application refers to two or more (including two).

[0084] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can continue to be used after the active material is activated by charging after the battery cell discharges.

[0085] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0086] The 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 extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0087] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0089] As an example, the positive electrode current collector can 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 electrodes, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] As an example, the positive electrode active material can 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 conventional materials that can be used as battery positive electrode active materials 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 can include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), composites of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), composites of lithium manganese phosphate and carbon, lithium manganese iron phosphate, composites of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides can 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 (which can also be abbreviated as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 811 )、lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05at least one of O2) and its modified compounds, etc.

[0091] In some embodiments, the positive electrode can adopt a foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material can also be provided. As an example, a lithium source material, potassium metal or sodium metal can also be filled or / and deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0092] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0093] As an example, the negative electrode current collector can adopt a metal foil, a foam metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0094] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0095] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0096] As an example, the negative electrode active material can adopt the negative electrode active material for battery monomers well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based materials can 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 conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0097] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0098] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0099] In some embodiments, the separator is a separator membrane. The types of separator membranes can be various, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0100] As an example, the material of the separator membrane can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane can be a single-layer film or a multi-layer composite film. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0101] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0102] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0103] In some embodiments, the electrolyte salts can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0104] In some embodiments, the solvents can 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, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. Ether solvents can also be selected. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0105] Among them, the gel-like electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0106] Among them, the solid electrolyte includes polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0107] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0108] As an example, the inorganic solid electrolyte can include oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0109] As an example, the composite solid electrolyte is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0110] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0111] In some embodiments, the electrode assembly has a laminated structure.

[0112] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0113] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0114] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple folded segments arranged in a stacked manner.

[0115] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0116] As an example, the separators can be continuously provided and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0117] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0118] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct the current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0119] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0120] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0121] 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.

[0122] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0123] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0124] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0125] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electric cabinet, etc.

[0126] The battery has outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptation range, and small self-discharge coefficient, and is an important part of the development of new energy today. The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, etc. In addition, the safety of the battery also needs to be considered.

[0127] For a general battery cell, the battery cell usually includes a housing and an electrode assembly accommodated in the housing. An electrode terminal is provided on the housing. Correspondingly, an ear is formed at one end of the electrode assembly. By electrically connecting the electrode terminal and the ear, the input or output of the electric energy of the battery cell is realized. However, since the ear is very easy to contact the housing, the battery cell is prone to short-circuit risk. Therefore, in the related art, an insulating film is coated on the outside of the electrode assembly or an insulating member is provided to insulate and isolate the ear and the housing through the insulating film or the insulating member. However, in the battery cell with this structure, the insulating film is prone to warping or damage during use, resulting in the battery cell still being prone to short-circuit risk between the ear and the housing during use, or the insulating member is prone to scraping the electrode assembly or being inserted into the electrode assembly, resulting in damage to the electrode assembly, which is not conducive to improving the assembly quality and use stability of the battery cell.

[0128] Based on the above considerations, to solve the problems of poor assembly quality and low usage stability of battery cells, an embodiment of the present application provides a battery cell, which includes a housing, an electrode terminal, an electrode assembly, and a first insulating member. The housing has a wall portion and a side wall, and the side wall surrounds the periphery of the wall portion. The electrode terminal is disposed on the wall portion. The electrode assembly is accommodated in the housing, the electrode assembly has a first tab, the first tab is disposed at one end of the electrode assembly close to the wall portion in the thickness direction of the wall portion, and the first tab is electrically connected to the electrode terminal. The first insulating member includes a first insulating portion and a second insulating portion. At least a part of the first insulating portion is located between the wall portion and the first tab, the second insulating portion surrounds the periphery of the first insulating portion, the second insulating portion and the first insulating portion jointly define a receiving space, along the thickness direction of the wall portion, one end of the second insulating portion is connected to the first insulating portion, and at least a part of the first tab is inserted into the receiving space. A groove is provided on the inner circumferential surface of the side wall, and one end of the second insulating portion away from the first insulating portion is inserted into the groove.

[0129] In the battery cell with this structure, a first insulating member for insulating and isolating the first tab from the housing is provided in the housing. The first insulating member includes a first insulating portion and a second insulating portion. The first insulating portion is disposed between the wall portion and the first tab, the second insulating portion surrounds the periphery of the first insulating portion, and one end of the second insulating portion in the thickness direction of the wall portion is connected to the first insulating portion, so that the first insulating portion and the second insulating portion jointly form a receiving space for the first tab to be inserted, so as to realize the separation between the first tab and the wall portion and between the first tab and the side wall respectively through the first insulating portion and the second insulating portion of the first insulating member, which is beneficial to improving the effect of the first insulating member in insulating and isolating the first tab and the housing, thereby reducing the short-circuit risk of the battery cell and improving the usage reliability of the battery cell. Among them, by providing a groove on the inner circumferential surface of the side wall and inserting one end of the second insulating portion away from the first insulating portion into the groove, the interference effect between the second insulating portion and the electrode assembly can be reduced, so that the phenomenon of the second insulating portion squeezing or rubbing against the electrode assembly can be alleviated during the use of the battery cell, and the phenomenon of one end of the second insulating portion away from the first insulating portion being inserted into the electrode assembly can be alleviated during the assembly process of the battery cell, which is beneficial to reducing the risk of damage to the electrode assembly and improving the assembly quality and usage stability of the battery cell.

[0130] The battery cell disclosed in the embodiment of the present application can be but is not limited to being used in electrical devices such as vehicles, ships or aircraft. A power supply system of the electrical device can be composed of the battery cell, battery, etc. disclosed in the present application. In this way, it is beneficial to alleviate the problem of damage to the electrode assembly during the assembly or use of the battery cell, and improve the assembly quality and usage stability of the battery cell.

[0131] An embodiment of the present application provides an electrical device using a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0132] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application for illustration.

[0133] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed 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 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for use of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0134] In some embodiments of the present application, the battery 100 can not only be used as an operating power source or a power source for use of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0135] Please refer to Figure 2 and Figure 3 , Figure 2 which is an exploded view of the structure of the battery 100 provided by some embodiments of the present application, Figure 3 and which is a schematic structural diagram of a battery cell 20 provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20. The battery cells 20 are used to be accommodated in the box body 10.

[0136] Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt various 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 cells 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. 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 both 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.

[0137] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube, etc. Exemplarily, in Figure 2 the box body 10 is in the shape of a cuboid.

[0138] In the battery 100, the number of battery cells 20 disposed in the box body 10 can be one or multiple. When there are multiple battery cells 20 disposed in the box body 10, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be that multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the box body 10.

[0139] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for connecting the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0140] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cuboid, a cylinder, a prism, or other shapes, etc. Exemplarily, in Figure 3 the battery cell 20 is in a cylindrical structure.

[0141] According to some embodiments of the present application, referring to Figure 3 , and further referring to Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 ,Figure 4 An exploded view of the structure of the battery cell 20 provided in some embodiments of the present application Figure 5 A cross-sectional view of the battery cell 20 provided in some embodiments of the present application Figure 6 is Figure 5 a partial enlarged view of the A position of the battery cell 20 shown in Figure 7 A schematic structural view of the first insulating member 24 provided in some embodiments of the present application Figure 8 A cross-sectional view of the first insulating member 24 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode terminal 22, an electrode assembly 23, and a first insulating member 24. The housing 21 has a wall portion 211 and a side wall 2123, and the side wall 2123 surrounds the wall portion 211. The electrode terminal 22 is disposed on the wall portion 211. The electrode assembly 23 is accommodated in the housing 21. The electrode assembly 23 has a first tab 232. The first tab 232 is disposed at one end of the electrode assembly 23 close to the wall portion 211 in the thickness direction X of the wall portion, and the first tab 232 is electrically connected to the electrode terminal 22. The first insulating member 24 includes a first insulating portion 241 and a second insulating portion 242. At least a part of the first insulating portion 241 is located between the wall portion 211 and the first tab 232. The second insulating portion 242 surrounds the first insulating portion 241. The second insulating portion 242 and the first insulating portion 241 jointly define an accommodation space 243. Along the thickness direction X of the wall portion, one end of the second insulating portion 242 is connected to the first insulating portion 241, and at least a part of the first tab 232 is inserted into the accommodation space 243. A groove 2123a is provided on the inner circumferential surface of the side wall 2123, and one end of the second insulating portion 242 away from the first insulating portion 241 is inserted into the groove 2123a.

[0142] Among them, the housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can be in a variety of structural forms. The material of the housing 21 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0143] In some embodiments, the housing 21 may include a housing body 212 and an end cap 213. An accommodation cavity is formed inside the housing body 212, and the accommodation cavity has an opening 2121, that is, the housing body 212 is a hollow structure with one end open. The end cap 213 is covered on the opening 2121 of the housing body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte.

[0144] Among them, the housing body 212 may include a bottom wall 2122 and a side wall 2123. The side wall 2123 surrounds the bottom wall 2122. One end of the side wall 2123 is connected to the bottom wall 2122, and the other end encloses to form an opening 2121.

[0145] Optionally, the wall portion 211 provided with the electrode terminal 22 may be the end cap 213 of the outer shell 21 or the bottom wall 2122 of the housing 212 of the outer shell 21. Exemplarily, in Figure 4 and Figure 5 , the wall portion 211 is the bottom wall 2122 of the housing 212 disposed opposite to the end cap 213 in the thickness direction X of the wall portion. Correspondingly, the thickness direction X of the wall portion is the arrangement direction of the end cap 213 and the wall portion 211, and is also the thickness direction of the end cap 213. Of course, in other embodiments, the wall portion 211 may also be the end cap 213 of the outer shell 21.

[0146] The side wall 2123 surrounds the periphery of the wall portion 211, that is, the side wall 2123 is an annular structure extending along the circumferential direction of the wall portion 211, and the side wall 2123 surrounds the outer peripheral side of the electrode assembly 23.

[0147] When assembling the battery cell 20, the electrode assembly 23 can be first placed into the housing 212, the electrolyte can be filled into the housing 212, and then the end cap 213 can be covered on the opening 2121 of the housing 212 to close the opening 2121 of the housing 212.

[0148] The housing 212 can be of various shapes, such as a cylinder, a cuboid, etc. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cylinder structure, the housing 212 can be selected as a cylinder structure; if the electrode assembly 23 is a cuboid structure, the housing 212 can be selected as a cuboid structure. Of course, the end cap 213 can also be of various structures, such as the end cap 213 being a plate-like structure or a hollow structure with one end open, etc. Exemplarily, in Figure 3 and Figure 4 , the housing 212 is a cylinder structure. Correspondingly, the side wall 2123 of the housing 212 is also a cylinder structure, and the central axis of the housing 212 extends along the thickness direction X of the wall portion. Correspondingly, the end cap 213 is a circular plate-like structure.

[0149] It can be understood that the outer shell 21 is not limited to the above structure. The outer shell 21 can also be other structures. For example, the outer shell 21 includes a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 at opposite sides. One end cap 213 is correspondingly covered on one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte. That is to say, the housing 212 of the outer shell 21 only includes the side wall 2123. The side wall 2123 is a hollow structure with openings 2121 formed at both ends in the thickness direction X of the wall portion. The two end caps 213 are respectively covered on the openings 2121 at both ends of the side wall 2123 in the thickness direction X of the wall portion.

[0150] It should be noted that the electrode assembly 23 is a component in the battery cell 20 where an electrochemical reaction occurs. The electrode assembly 23 includes a first electrode tab, a second electrode tab, and a separator 234. The first electrode tab and the second electrode tab have opposite polarities. A portion of the separator 234 is disposed between the first electrode tab and the second electrode tab to separate the first electrode tab and the second electrode tab. Among them, the structure of the electrode assembly 23 can be various. For example, the electrode assembly 23 can be a wound structure formed by winding the first electrode tab, the separator 234, and the second electrode tab, or a stacked structure formed by stacking the first electrode tab, the separator 234, and the second electrode tab. In Figure 4 this case, the electrode assembly 23 is a wound structure formed by winding the first electrode tab, the separator 234, and the second electrode tab. The electrode assembly 23 has a cylindrical structure, and the central axis of the electrode assembly 23 extends along the thickness direction X of the wall portion.

[0151] Among them, the first electrode tab includes a first main body and a first tab 232 connected to one end of the first main body. The first main body is the area on the first electrode tab coated with the active material layer, while the first tab 232 is the area on the first electrode tab not coated with the active material layer. If the first electrode tab is a positive electrode tab, the first main body is the area on the first electrode tab coated with the positive electrode active material layer, while the first tab 232 is the area on the first electrode tab not coated with the positive electrode active material layer, and the first tab 232 is used to input or output the positive electrode of the electrode assembly 23. If the first electrode tab is a negative electrode tab, the first main body is the area on the first electrode tab coated with the negative electrode active material layer, while the first tab 232 is the area on the first electrode tab not coated with the negative electrode active material layer, and the first tab 232 is used to input or output the negative electrode of the electrode assembly 23. Similarly, the second electrode tab includes a second main body and a second tab 233 connected to one end of the second main body. The second main body is the area on the second electrode tab coated with the active material layer, while the second tab 233 is the area on the second electrode tab not coated with the active material layer. If the second electrode tab is a positive electrode tab, the second main body is the area on the second electrode tab coated with the positive electrode active material layer, while the second tab 233 is the area on the second electrode tab not coated with the positive electrode active material layer, and the second tab 233 is used to input or output the positive electrode of the electrode assembly 23. If the second electrode tab is a negative electrode tab, the second main body is the area on the second electrode tab coated with the negative electrode active material layer, while the second tab 233 is the area on the second electrode tab not coated with the negative electrode active material layer, and the second tab 233 is used to input or output the negative electrode of the electrode assembly 23.

[0152] Exemplarily, the material of the first tab 232 can be copper or aluminum, etc. Similarly, the material of the second tab 233 can also be copper or aluminum, etc.

[0153] The first electrode tab and the second electrode tab have opposite polarities, that is, if the first electrode tab is a positive electrode tab, then the second electrode tab is a negative electrode tab, and vice versa. If the first electrode tab is a negative electrode tab, then the second electrode tab is a positive electrode tab.

[0154] It should be noted that the part formed by winding the first main body of the first pole piece and the second main body of the second pole piece together is the main body part 231 of the electrode assembly 23, and the first pole ear 232 and the second pole ear 233 are respectively formed at both ends of the main body part 231 in the thickness direction X of the wall part. The first pole ear 232 is located at one end of the main body part 231 in the thickness direction X of the wall part close to the wall part 211, so that the first pole ear 232 is arranged at one end of the electrode assembly 23 in the thickness direction X of the wall part close to the wall part 211, and the second pole ear 233 is located at one end of the main body part 231 in the thickness direction X of the wall part far from the wall part 211.

[0155] Exemplarily, the first pole ear 232 of the first pole piece can be formed at one end of the main body part 231 in the thickness direction X of the wall part close to the wall part 211 through a flattening process or a smoothing process. Similarly, the second pole ear 233 of the second pole piece can be formed at one end of the main body part 231 in the thickness direction X of the wall part far from the wall part 211 through a flattening process or a smoothing process.

[0156] A part of the separator 234 is arranged between the first pole piece and the second pole piece to insulate and isolate the first pole piece and the second pole piece, and a part of the separator 234 surrounds and covers the outside of the main body part 231 of the electrode assembly 23 around the axis extending along the thickness direction X of the wall part, so that the separator 234 can also insulate and isolate the electrode assembly 23 and the side wall 2123. It should be noted that Figure 6 only shows the part of the separator 234 covering the outside of the electrode assembly 23, and the part of the separator 234 located between the first pole piece and the second pole piece is not shown. Among them, the part of the separator 234 that surrounds and covers the outside of the electrode assembly 23 around the axis extending along the thickness direction X of the wall part is the part for finishing of the separator 234 in the electrode assembly 23.

[0157] Exemplarily, the main material of the separator 234 can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0158] Optionally, the electrode assembly 23 accommodated in the housing 21 can be one or more. Exemplarily, in Figure 4 and Figure 5 only one electrode assembly 23 is provided in the housing 21 of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 23 accommodated in the housing 21 can be two, three, four, five, six, seven, eight, etc.

[0159] In the embodiment of the present application, the electrode terminal 22 serves to input or output the electrical energy of the battery cell 20 . The electrode terminal 22 is insulated and installed on the wall 211 of the shell 21 , and the electrode terminal 22 is used to be electrically connected to the electrode assembly 23 to output or input the electrical energy of the battery cell 20 .

[0160] It should be noted that the electrode terminal 22 is insulated and installed on the wall portion 211 , that is, no electrical connection is formed between the electrode terminal 22 and the wall portion 211 .

[0161] See also Figure 5 and Figure 6 As shown, the electrode terminal 22 is a structure riveted on the wall portion 211, that is, a mounting hole 2111 is provided on the wall portion 211, and the mounting hole 2111 penetrates both sides of the wall portion 211 along the thickness direction X of the wall portion, and a part of the electrode terminal 22 is penetrated in the mounting hole 2111, and the electrode terminal 22 has a first clamping portion 221 located on the side of the wall portion 211 facing the electrode assembly 23 and a second clamping portion 222 located on the side of the wall portion 211 away from the electrode assembly 23, and at least a part of the wall portion 211 is located between the first clamping portion 221 and the second clamping portion 222 in the thickness direction X of the wall portion, so that the first clamping portion 221 and the second clamping portion 222 can cooperate with the clamping wall portion 211 to realize the riveting of the electrode terminal 22 to the wall portion 211. Of course, in other embodiments, the electrode terminal 22 can also be a structure welded or bonded to the wall portion 211.

[0162] In some embodiments, please see Figure 5 and Figure 6 As shown, the battery cell 20 may also include a second insulating member 25 and a third insulating member 26, the second insulating member 25 is located on the side of the wall portion 211 facing the electrode assembly 23, and a portion of the second insulating member 25 is located between the first clamping portion 221 and the wall portion 211 to insulate and isolate the first clamping portion 221 and the wall portion 211, and the third insulating member 26 is located on the side of the wall portion 211 away from the electrode assembly 23, and a portion of the third insulating portion is located between the second clamping portion 222 and the wall portion 211 to insulate and isolate the second clamping portion 222 and the wall portion 211.

[0163] Exemplarily, the second insulating member 25 and the third insulating member 26 can be made of various materials, such as plastic, rubber or silicone.

[0164] exist Figure 6In the [description], the battery cell 20 may further include a seal 27 disposed between the wall portion 211 and the electrode terminal 22, and at least a part of the seal 27 extends into the mounting hole 2111, such that at least a part of the seal 27 is located between the electrode terminal 22 and the wall surface of the mounting hole 2111, so that the seal 27 can seal the gap between the electrode terminal 22 and the wall surface of the mounting hole 2111, and the seal 27 can also insulate and isolate the electrode terminal 22 and the wall surface of the mounting hole 2111.

[0165] Exemplarily, the material of the seal 27 can be various, for example, rubber, plastic, or silica gel, etc.

[0166] Among them, referring to Figure 4 and Figure 5 as shown, the first tab 232 is electrically connected to the electrode terminal 22, the second tab 233 is electrically connected to the housing 21, and the housing 21 is electrically connected to the second tab 233 at a wall opposite to the wall portion 211 in the thickness direction X of the wall portion. Exemplarily, the wall portion 211 is the bottom wall 2122 of the housing 212, correspondingly, the end cap 213 of the housing 21 is electrically connected to the second tab 233. If the end cap 213 is the wall portion 211, then the bottom wall 2122 of the housing 212 is electrically connected to the second tab 233. Of course, in other embodiments, the battery cell 20 may also include two electrode terminals 22, the two electrode terminals 22 are respectively installed at both ends of the housing 21 in the thickness direction X of the wall portion, and the two electrode terminals 22 are respectively electrically connected to the first tab 232 and the second tab 233 located at both ends of the electrode assembly 23 in the thickness direction X of the wall portion, so as to realize the input or output of the electrical energy of the battery cell 20.

[0167] Exemplarily, the material of the electrode terminal 22 can also be various, for example, the material of the electrode terminal 22 can be copper, iron, aluminum, steel, or aluminum alloy, etc.

[0168] In some embodiments, referring to Figure 4 、 Figure 5 and Figure 6 as shown, the battery cell 20 may further include two current collecting members, the two current collecting members are respectively a first current collecting member 28 and a second current collecting member 29. The first current collecting member 28 and the second current collecting member 29 are both disposed inside the housing 21. The first current collecting member 28 is used to connect the first tab 232 and the electrode terminal 22, and the second current collecting member 29 is used to connect the second tab 233 and the housing 21, thereby facilitating the reduction of the assembly difficulty between the first tab 232 and the electrode terminal 22 and between the second tab 233 and the housing 21.

[0169] Among them, if the wall portion 211 is the bottom wall 2122 of the housing 212, then the second current collecting member 29 is a structure connecting the second tab 233 and the end cap 213.

[0170] Exemplarily, the materials of the first current collector member 28 and the second current collector member 29 can be various. For example, the materials of the first current collector member 28 and the second current collector member 29 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0171] In the embodiment of the present application, the first insulating member 24 functions to insulate and isolate the first tab 232 and the housing 21. The first insulating member 24 includes a first insulating portion 241 and a second insulating portion 242, that is, the first insulating member 24 is composed of two parts.

[0172] The second insulating portion 242 surrounds the first insulating portion 241. The second insulating portion 242 and the first insulating portion 241 jointly define a receiving space 243. That is to say, the first insulating member 24 is a hollow structure with an opening formed at at least one end in the thickness direction X of the wall portion, so that the first insulating member 24 can be sleeved on the electrode assembly 23 from one end of the electrode assembly 23 close to the wall portion 211, that is, the end of the electrode assembly 23 where the first tab 232 is formed can be inserted into the receiving space 243 of the first insulating member 24.

[0173] Exemplarily, referring to Figure 7 and Figure 8 as shown, the second insulating portion 242 is connected to the first insulating portion 241 at one end close to the wall portion 211 in the thickness direction X of the wall portion, so that the first insulating member 24 is a hollow structure with an opening formed at the end of the second insulating portion 242 away from the first insulating portion 241.

[0174] Along the thickness direction X of the wall portion, at least a part of the first tab 232 is inserted into the receiving space 243, and the first insulating portion 241 is located between the wall portion 211 and the first tab 232. That is to say, in the thickness direction X of the wall portion, the wall portion 211 and the first tab 232 are respectively located on both sides of the first insulating portion 241, and the second insulating portion 242 surrounds the outside of the first tab 232. That is, the second insulating portion 242 is an annular structure, and the second insulating portion 242 surrounds the first tab 232, so that the first insulating member 24 can insulate and isolate the housing 21 and the first tab 232.

[0175] Exemplarily, in Figure 6 and Figure 7 , the first insulating portion 241 is provided with a through hole 2411 for the electrode terminal 22 to insert. The through hole 2411 penetrates through both sides of the first insulating portion 241 along the thickness direction X of the wall portion, so that the through hole 2411 is communicated with the receiving space 243, and the electrode terminal 22 is inserted into the through hole 2411 along the thickness direction X of the wall portion and is electrically connected to the first tab 232.

[0176] Optionally, the first insulating portion 241 and the second insulating portion 242 of the first insulating member 24 may be an integrally formed structure or a separately arranged structure. Exemplarily, in Figure 7 and Figure 8 , the first insulating portion 241 and the second insulating portion 242 of the first insulating member 24 are of an integrally formed structure, that is, the first insulating portion 241 and the second insulating portion 242 of the first insulating member 24 are an integral structure. The first insulating portion 241 and the second insulating portion 242 of the first insulating member 24 can be made by integrally formed processes such as injection molding or milling. Of course, in other embodiments, the first insulating portion 241 and the second insulating portion 242 of the first insulating member 24 may also be a separately arranged structure, and one end of the second insulating portion 242 close to the wall portion 211 can be connected to the first insulating portion 241 through structures such as bonding or snap connection.

[0177] Exemplarily, the material of the first insulating member 24 can be various, such as rubber, plastic, or silicone.

[0178] A groove 2123a is provided on the inner circumferential surface of the side wall 2123, and one end of the second insulating portion 242 away from the first insulating portion 241 is inserted into the groove 2123a. That is to say, a groove 2123a is formed on the surface of the side wall 2123 facing the electrode assembly 23, and at least a part of one end of the second insulating portion 242 away from the first insulating portion 241 is received in the groove 2123a. It should be noted that one end of the second insulating portion 242 away from the first insulating portion 241 may be a structure that is entirely located in the groove 2123a in the radial direction Y of the second insulating portion, that is, one end of the second insulating portion 242 away from the first insulating portion 241 does not protrude from the inner circumferential surface of the side wall 2123 in the radial direction Y of the second insulating portion. Of course, one end of the second insulating portion 242 away from the first insulating portion 241 may also be a structure that is partially located in the groove 2123a in the radial direction Y of the second insulating portion, that is, one end of the second insulating portion 242 away from the first insulating portion 241 protrudes from the inner circumferential surface of the side wall 2123 in the radial direction Y of the second insulating portion.

[0179] It should be noted that the radial direction Y of the second insulating portion is perpendicular to the thickness direction X of the wall portion. The radial direction Y of the second insulating portion is: in a plane perpendicular to the thickness direction X of the wall portion, the direction from the central position of the second insulating portion 242 to the outer circumferential surface of the second insulating portion 242 or the direction from the outer circumferential surface of the second insulating portion 242 to the central position of the second insulating portion 242.

[0180] Exemplarily, the groove 2123a is an annular groove structure extending along the circumferential direction of the side wall 2123, that is, the groove 2123a is arranged around the electrode assembly 23.

[0181] In some embodiments, the battery cell 20 may further include a pressure relief mechanism disposed on the outer shell 21, and the pressure relief mechanism is configured to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0182] Optionally, the pressure relief mechanism may be disposed on the end cap 213 of the outer shell 21 or on the housing 212 of the outer shell 21. Similarly, the pressure relief mechanism and the outer shell 21 may be an integrally formed structure or a separately arranged structure. If the pressure relief mechanism and the outer shell 21 are a split structure, the pressure relief mechanism may be connected to the outer shell 21 by means such as welding. Correspondingly, the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve or a safety valve; if the pressure relief mechanism and the outer shell 21 may also be an integrally formed structure, the pressure relief mechanism is an area on the outer shell 21 where a weak structure is formed. For example, an area on the outer shell 21 where a notch groove is provided.

[0183] In this embodiment, a first insulating member 24 for insulating and isolating the first tab 232 from the outer shell 21 is disposed inside the outer shell 21. The first insulating member 24 includes a first insulating portion 241 and a second insulating portion 242. The first insulating portion 241 is disposed between the wall portion 211 and the first tab 232. The second insulating portion 242 surrounds the first insulating portion 241, and one end of the second insulating portion 242 in the thickness direction X of the wall portion is connected to the first insulating portion 241, so that the first insulating portion 241 and the second insulating portion 242 jointly form a receiving space 243 for inserting the first tab 232. By means of the first insulating portion 241 and the second insulating portion 242 of the first insulating member 24, the separation between the first tab 232 and the wall portion 211 and between the first tab 232 and the side wall 2123 can be respectively realized, which is beneficial to improving the effect of the first insulating member 24 in insulating and isolating the first tab 232 and the outer shell 21, thereby being able to reduce the short-circuit risk of the battery cell 20 and improve the use reliability of the battery cell 20. Wherein, by providing a groove 2123a on the inner circumferential surface of the side wall 2123 and inserting one end of the second insulating portion 242 away from the first insulating portion 241 into the groove 2123a, the interference effect between the second insulating portion 242 and the electrode assembly 23 can be reduced, so that the phenomenon of the second insulating portion 242 squeezing or rubbing against the electrode assembly 23 during the use of the battery cell 20 can be alleviated, and the phenomenon of one end of the second insulating portion 242 away from the first insulating portion 241 being inserted into the electrode assembly 23 during the assembly process of the battery cell 20 can be alleviated. Furthermore, it is beneficial to reduce the risk of damage to the electrode assembly 23 and improve the assembly quality and use stability of the battery cell 20.

[0184] According to some embodiments of the present application, refer to Figure 5 and Figure 6As shown, the electrode assembly 23 includes a first pole piece. The first pole piece includes a first main body and a first tab 232. The first tab 232 is connected to one end of the first main body close to the wall portion 211 in the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, one end of the second insulating portion 242 far from the first insulating portion 241 extends between the first main body and the side wall 2123, and the first tab 232 is entirely located in the accommodation space 243.

[0185] Wherein, the part formed by winding the first main body of the first pole piece and the second main body of the second pole piece together is the main body portion 231 of the electrode assembly 23. Correspondingly, one end of the second insulating portion 242 far from the first insulating portion 241 in the thickness direction X of the wall portion extends between the main body portion 231 of the electrode assembly 23 and the side wall 2123 of the housing 21. That is to say, in the radial direction Y of the second insulating portion, one end of the second insulating portion 242 far from the first insulating portion 241 is located between the main body portion 231 of the electrode assembly 23 and the side wall 2123 of the housing 21, so that the first tab 232 connected to one end of the main body portion 231 close to the wall portion 211 in the thickness direction X of the wall portion can be entirely inserted into the accommodation space 243, that is, the projection of the first tab 232 in the radial direction Y of the second insulating portion is located within the second insulating portion 242.

[0186] In this embodiment, by extending one end of the second insulating portion 242 far from the first insulating portion 241 between the first main body of the first pole piece and the side wall 2123, the first tab 232 can be entirely accommodated in the accommodation space 243. Since one end of the second insulating portion 242 far from the first insulating portion 241 is inserted into the groove 2123a, that is, one end of the second insulating portion 242 extending between the first main body and the side wall 2123 is inserted into the groove 2123a, the battery cell 20 with this structure can relieve the situation that one end of the second insulating portion 242 far from the first insulating portion 241 is inserted into the electrode assembly 23 or scratches and damages the electrode assembly 23, and at the same time can further improve the effect of the first insulating member 24 insulating and isolating the first tab 232 and the side wall 2123, so as to further reduce the short - circuit risk of the battery cell 20.

[0187] According to some embodiments of the present application, please continue to refer to Figure 5 and Figure 6 As shown, the groove 2123a is an annular groove extending along the circumferential direction of the side wall 2123. That is to say, the groove 2123a is an annular structure that is connected end to end in its extending direction and surrounds the outside of the electrode assembly 23.

[0188] In this embodiment, by setting the groove 2123a as an annular groove structure extending along the circumferential direction of the side wall 2123, both the groove 2123a and the second insulating portion 242 are annular structures, so that one end of the second insulating portion 242 away from the first insulating portion 241 can be inserted into the groove 2123a, which is beneficial to reducing the assembly difficulty between the second insulating portion 242 and the groove 2123a and improving the assembly efficiency of the battery cell 20.

[0189] According to some embodiments of the present application, referring to Figure 6 As shown, the wall thickness of the side wall 2123 is D1, and the groove depth of the groove 2123a is H, satisfying 1 / 3 ≤ H / D1 ≤ 1 / 2.

[0190] Wherein, the wall thickness D1 of the side wall 2123 is the thickness dimension of the side wall 2123 in the normal direction of its inner circumferential surface. Exemplarily, in the embodiment of the present application, if the side wall 2123 is in a cylindrical shape, the wall thickness D1 of the side wall 2123 is the thickness dimension of the side wall 2123 in its radial direction.

[0191] The groove depth H of the groove 2123a is the maximum distance between the groove bottom surface of the groove 2123a and the inner circumferential surface of the side wall 2123 at the corresponding position in the normal direction of the inner circumferential surface of the side wall 2123 at the corresponding position. Exemplarily, in the embodiment of the present application, if the side wall 2123 is in a cylindrical shape, the groove depth H of the groove 2123a is the maximum depth of the groove 2123a in the radial direction of the side wall 2123, and is also the minimum difference between the wall thickness D1 of the side wall 2123 and the wall thickness of the groove bottom wall 2122 of the groove 2123a.

[0192] Exemplarily, the ratio of the groove depth H of the groove 2123a to the wall thickness D1 of the side wall 2123 can be 1 / 3, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49 or 0.5, etc.

[0193] Exemplarily, the wall thickness D1 of the side wall 2123 is generally greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

[0194] In this embodiment, the ratio of the groove depth of the groove 2123a to the wall portion 211 of the side wall 2123 is one-third to one-half. On the one hand, by setting the groove depth of the groove 2123a to be greater than or equal to one-third of the wall thickness of the side wall 2123, the phenomenon that the depth of the groove 2123a provided on the inner circumferential surface of the side wall 2123 is too large is alleviated, so that the wall thickness of the bottom wall 2122 of the groove 2123a can be increased, which is beneficial to improving the structural strength of the area of the side wall 2123 where the groove 2123a is provided, so as to alleviate the phenomena such as fracture or breakage of the side wall 2123 during use. On the other hand, by setting the groove depth of the groove 2123a to be less than or equal to one-half of the wall thickness of the side wall 2123, it is beneficial to increase the spatial dimension of the groove 2123a for accommodating the end of the second insulating portion 242 away from the first insulating portion 241, so that the effect of the groove 2123a accommodating the end of the second insulating portion 242 away from the first insulating portion 241 can be improved, so that the phenomena of the second insulating portion 242 squeezing or scraping the electrode assembly 23 can be effectively alleviated during the use of the battery cell 20, and the phenomenon that the end of the second insulating portion 242 away from the first insulating portion 241 is inserted into the electrode assembly 23 can be effectively alleviated during the assembly process of the battery cell 20, thereby being beneficial to reducing the risk of damage to the electrode assembly 23.

[0195] According to some embodiments of the present application, please continue to refer to Figure 6 As shown, the outer circumferential surface of the second insulating portion 242 is in interference fit with the bottom surface of the groove 2123a.

[0196] In this embodiment, by setting the outer circumferential surface of the second insulating portion 242 and the bottom surface of the groove 2123a to be in an interference fit structure, the first insulating member 24 is a structure fastened in the housing 21, so that the stability of the first insulating member 24 assembled into the housing 21 can be improved, which is beneficial to alleviating the phenomena such as crosstalk or displacement of the first insulating member 24 during use, so as to improve the use reliability of the battery cell 20.

[0197] According to some embodiments of the present application, refer to Figure 7 and Figure 8 As shown, along the thickness direction X of the wall portion, a notch 2421 is provided at the end of the second insulating portion 242 away from the first insulating portion 241, and the notch 2421 penetrates the inner circumferential surface and the outer circumferential surface of the second insulating portion 242.

[0198] Among them, a notch 2421 is provided at the end of the second insulating portion 242 away from the first insulating portion 241, that is to say, a notch 2421 is provided on the end surface of the end of the second insulating portion 242 away from the first insulating portion 241 in the thickness direction X of the wall portion.

[0199] The notch 2421 penetrates through the inner peripheral surface and the outer peripheral surface of the second insulating part 242, that is, the notch 2421 is a structure extending along the radial direction Y of the second insulating part, and both ends of the notch 2421 in the radial direction Y of the second insulating part extend to the inner peripheral surface and the outer peripheral surface of the second insulating part 242 respectively.

[0200] In this embodiment, by providing the notch 2421 at one end of the second insulating part 242 away from the first insulating part 241 in the thickness direction X of the wall part, and the notch 2421 is a structure penetrating through the inner peripheral surface and the outer peripheral surface of the second insulating part 242, the second insulating part 242 is more easily deformed in the radial direction Y of the second insulating part, so as to facilitate the assembly of the first insulating member 24 into the housing 21, and further reduce the difficulty of the interference fit between the second insulating part 242 and the bottom surface of the groove 2123a, thereby reducing the difficulty of assembling the first insulating member 24 into the housing 21, which is beneficial to improving the assembly efficiency of the battery cell 20.

[0201] In some embodiments, referring to Figure 7 As shown, the second insulating part 242 is provided with a plurality of notches 2421, and the plurality of notches 2421 are arranged at intervals along the circumferential direction of the second insulating part 242.

[0202] In this embodiment, by providing a plurality of notches 2421 arranged at intervals along the circumferential direction of the second insulating part 242 on the second insulating part 242, the deformation ability of the second insulating part 242 in the radial direction Y of the second insulating part is further improved, so as to further reduce the difficulty of the interference fit between the second insulating part 242 and the bottom surface of the groove 2123a, and further reduce the difficulty of assembling the first insulating member 24 into the housing 21.

[0203] According to some embodiments of the present application, in combination with Figure 6 、 Figure 7 and Figure 8 As shown, the electrode assembly 23 includes a first pole piece, a second pole piece and a separator 234. The polarities of the first pole piece and the second pole piece are opposite. The first pole piece includes a first main body and a first pole tab 232. The first pole tab 232 is connected to one end of the first main body close to the wall part 211 in the thickness direction X of the wall part. A part of the separator 234 is disposed between the first pole piece and the second pole piece to separate the first pole piece and the second pole piece, and a part of the separator 234 covers the outside of the electrode assembly 23. Along the radial direction Y of the second insulating part, the projection of the notch 2421 is located within the part of the separator 234 covering the outside of the electrode assembly 23, and the radial direction Y of the second insulating part is perpendicular to the thickness direction X of the wall part.

[0204] Among them, a part of the separator film 234 is wrapped around the outer side of the main body portion 231 of the electrode assembly 23 along an axis extending in the thickness direction X of the wall portion. That is to say, the end portion of the separator film 234 continues to extend circumferentially along the electrode assembly 23 and is disposed around the outer peripheral side of the main body portion 231 of the electrode assembly 23. The part of the separator film 234 located between the first electrode tab and the second electrode tab mainly functions to separate the first main body of the first electrode tab and the second main body of the second electrode tab.

[0205] Along the radial direction Y of the second insulating portion, the projection of the notch 2421 is located within the part of the separator film 234 wrapped around the outer side of the electrode assembly 23. That is to say, the part of the separator film 234 wrapped around the outer side of the electrode assembly 23 covers and conceals the notch 2421 in the radial direction Y of the second insulating portion.

[0206] In this embodiment, the part of the separator film 234 for separating the first electrode tab and the second electrode tab is wound around and wrapped around the outer side of the electrode assembly 23, so that the separator film 234 can also play a role in insulating and isolating the first electrode tab and the side wall 2123 of the housing 21 and the second electrode tab and the side wall 2123 of the housing 21. By setting the projection of the notch 2421 on the second insulating portion 242 in the radial direction Y of the second insulating portion to be located within the part of the separator film 234 wrapped around the outer side of the electrode assembly 23, the part of the separator film 234 wrapped around the outer side of the electrode assembly 23 has a structure that covers and blocks the notch 2421 in the radial direction Y of the second insulating portion, thereby reducing the phenomenon that the first electrode tab 232 leaks out from the notch 2421 and overlaps with the side wall 2123 of the housing 21, reducing the risk of internal short circuit of the battery cell 20, and further improving the use reliability of the battery cell 20.

[0207] According to some embodiments of the present application, referring to Figure 6 As shown, the electrode assembly 23 includes a first electrode tab, a second electrode tab, and a separator film 234. The polarities of the first electrode tab and the second electrode tab are opposite. The first electrode tab includes a first main body and a first electrode tab 232. The first electrode tab 232 is connected to one end of the first main body close to the wall portion 211 in the thickness direction X of the wall portion. A part of the separator film 234 is disposed between the first electrode tab and the second electrode tab to separate the first electrode tab and the second electrode tab, and a part of the separator film 234 is wrapped around the outer side of the electrode assembly 23. Along the thickness direction X of the wall portion, the first electrode tab 232 extends beyond one end of the separator film 234 close to the wall portion 211, and one end of the part of the separator film 234 wrapped around the outer side of the electrode assembly 23 close to the wall portion 211 is inserted into the accommodation space 243.

[0208] Among them, along the thickness direction X of the wall portion, the first tab 232 extends beyond one end of the separator 234 close to the wall portion 211, and one end of the portion of the separator 234 covering the outside of the electrode assembly 23 close to the wall portion 211 is inserted into the accommodation space 243. That is to say, one end of the portion of the separator 234 covering the outside of the main body portion 231 of the electrode assembly 23 in the thickness direction X of the wall portion is inserted into the accommodation space 243 of the first insulating member 24, and the first tab 232 is a structure that extends beyond the separator 234 in the thickness direction X of the wall portion.

[0209] In this embodiment, by setting the first tab 232 to extend beyond one end of the separator 234 close to the wall portion 211 in the thickness direction X of the wall portion, it is convenient for the first tab 232 to be electrically connected to the electrode terminal 22, which is beneficial to reducing the assembly difficulty between the first tab 232 and the electrode terminal 22, and can reduce the risk of damaging the separator 234 when the first tab 232 and the electrode terminal 22 are assembled and connected to each other. In addition, by setting the portion of the separator 234 covering the outside of the electrode assembly 23 to be inserted into the accommodation space 243 of the first insulating member 24 in the thickness direction X of the wall portion, a part of the second insulating portion 242 and a part of the separator 234 can overlap each other in the radial direction Y of the second insulating portion, so as to improve the insulating isolation effect of the second insulating portion 242 of the first insulating member 24 and the separator 234 on the first pole piece and the side wall 2123 of the housing 21 and the second pole piece and the side wall 2123 of the housing 21, so as to reduce the risk of the exposed part of the first tab 232 overlapping with the side wall 2123 of the housing 21. On the one hand, the use reliability of the battery cell 20 can be further improved. On the other hand, there is no need to further cover the outside of the electrode assembly 23 with an insulating film or other structures, which is beneficial to reducing the manufacturing cost of the battery cell 20 and optimizing the production process of the battery cell 20.

[0210] According to some embodiments of the present application, referring to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown in

[0211] Among them, the first current collector member 28 is disposed between the first tab 232 and the first insulating portion 241 along the thickness direction X of the wall portion. That is to say, in the thickness direction X of the wall portion, the first insulating portion 241 of the first insulating member 24 and the first tab 232 of the electrode assembly 23 are respectively located on both sides of the first current collector member 28, so that the first current collector member 28 is located within the accommodation space 243 jointly defined by the first insulating portion 241 and the second insulating portion 242.

[0212] The first insulating portion 241 is provided with a through hole 2411, and the through hole 2411 communicates with the accommodation space 243. That is to say, the through hole 2411 on the first insulating portion 241 is a structure extending along the thickness direction X of the wall portion, and the through hole 2411 penetrates both sides of the first insulating portion 241 in the thickness direction X of the wall portion, so that the electrode terminal 22 can extend into the accommodation space 243 through the through hole 2411, enabling the first current collector member 28 to connect the electrode terminal 22 and the first tab 232.

[0213] It should be noted that in other embodiments, the electrode terminal 22 may also be a structure not inserted into the through hole 2411. For example, a protrusion is formed on the side of the first current collector member 28 facing the wall portion 211, and the protrusion is inserted into the through hole 2411 along the thickness direction X of the wall portion and connected to the electrode terminal 22 to achieve electrical connection between the electrode terminal 22 and the first current collector member 28.

[0214] Exemplarily, the connection structure between the first current collector member 28 and the first tab 232 can be various, such as welding connection or abutting, etc. Similarly, the connection structure between the first current collector member 28 and the electrode terminal 22 can also be various, such as welding connection or abutting, etc.

[0215] In this embodiment, a first current collector member 28 is further disposed within the outer casing 21. The first current collector member 28 is disposed between the first insulating portion 241 and the first tab 232, and the first insulating portion 241 is provided with a through hole 2411 for inserting the electrode terminal 22, enabling the first current collector member 28 to connect the electrode terminal 22 and the first tab 232. On the one hand, the battery cell 20 adopting this structure can reduce the difficulty of electrically connecting the electrode terminal 22 and the first tab 232, thereby reducing the assembly difficulty of the battery cell 20. On the other hand, the first current collector member 28 is also located within the accommodation space 243 of the first insulating member 24, so that the first insulating member 24 can insulate and isolate the first current collector member 28 and the outer casing 21 while insulating and isolating the first tab 232 and the outer casing 21, which is beneficial to reducing the short - circuit risk between the current collector member and the outer casing 21, and further reducing the short - circuit risk of the battery cell 20, thereby further improving the use reliability of the battery cell 20.

[0216] According to some embodiments of the present application, refer to Figure 6As shown, the first insulating portion 241 is connected to the first current collecting member 28.

[0217] Exemplarily, the first insulating portion 241 is connected to the first current collecting member 28 on the side facing the first tab 232 in the thickness direction X of the wall portion.

[0218] Optionally, the connection structure between the first insulating portion 241 and the first current collecting member 28 can be various, such as bonding, clamping, or bolt screwing, etc.

[0219] In this embodiment, by connecting the first insulating portion 241 of the first insulating member 24 to the first current collecting member 28, the first insulating member 24 is fixed to the first current collecting member 28. With this structure, on the one hand, the battery cell 20 can improve the stability of the first insulating member 24 assembled into the housing 21, which is beneficial to alleviating phenomena such as the first insulating member 24 moving or shifting during use, so as to improve the reliability of the battery cell 20. On the other hand, it can realize that after the first insulating member 24, the first current collecting member 28, and the electrode assembly 23 are assembled, the formed whole is then assembled into the housing 21, thereby reducing the assembly deviation between the first insulating member 24 and the electrode assembly 23, and further improving the assembly quality between the first insulating member 24 and the electrode assembly 23. Moreover, during the process of assembling the electrode assembly 23 into the housing 21, the risk of the first insulating member 24 damaging the electrode assembly 23 can be reduced, which is beneficial to improving the production quality of the battery cell 20.

[0220] In some embodiments, please continue to refer to Figure 6 As shown, the first insulating portion 241 is adhesively connected to the first current collecting member 28.

[0221] Wherein, in the thickness direction X of the wall portion, an adhesive layer 30 is provided between the first insulating portion 241 and the first current collecting member 28, and the first insulating portion 241 and the first current collecting member 28 are adhesively connected through the adhesive layer 30. Exemplarily, the adhesive layer 30 can be glue, double-sided tape, or hot melt adhesive, etc. provided between the first insulating portion 241 and the first current collecting member 28.

[0222] In this embodiment, by using the structure of adhesive connection to connect the first insulating portion 241 of the first insulating member 24 to the first current collecting member 28, on the one hand, the connection difficulty between the first insulating member 24 and the first current collecting member 28 can be reduced to improve the assembly efficiency of the battery cell 20. On the other hand, it can realize that the connection and assembly between the first insulating member 24 and the first current collecting member 28 do not affect the first current collecting member 28, which is beneficial to reducing the phenomenon of the first current collecting member 28 being damaged.

[0223] According to some embodiments of the present application, refer to Figure 5 、 Figure 6 andFigure 7 As shown, the battery cell 20 may further include a second insulating member 25. At least a part of the second insulating member 25 is disposed between the wall portion 211 and the first insulating portion 241. The second insulating member 25 is configured to insulate and isolate the first current collecting member 28 and the wall portion 211. Along the thickness direction X of the wall portion, a limiting portion 251 protrudes from a side of the second insulating member 25 facing away from the wall portion 211. The limiting portion 251 is inserted into the through hole 2411, and the limiting portion 251 is located between the electrode terminal 22 and the hole wall surface of the through hole 2411.

[0224] Wherein, at least a part of the second insulating member 25 is disposed between the wall portion 211 and the first insulating portion 241, that is, at least a part of the second insulating member 25 extends between the wall portion 211 and the first insulating portion 241, so that in the thickness direction X of the wall portion, the wall portion 211 and the first insulating portion 241 are respectively located on both sides of the second insulating member 25.

[0225] The limiting portion 251 is inserted into the through hole 2411, and the limiting portion 251 is located between the electrode terminal 22 and the hole wall surface of the through hole 2411. That is to say, at least a part of the limiting portion 251 extends into the through hole 2411 of the first insulating portion 241 along the thickness direction X of the wall portion, and the limiting portion 251 is located between the outer peripheral surface of the portion of the electrode terminal 22 inserted into the through hole 2411 and the hole wall surface of the through hole 2411.

[0226] Optionally, the Rockwell hardness of the second insulating member 25 is greater than or equal to 50HRC and less than or equal to 100HRC.

[0227] In this embodiment, a second insulating member 25 is further disposed in the outer shell 21, and at least a part of the second insulating member 25 is located between the wall portion 211 and the first insulating portion 241, so that the wall portion 211 and the first current collecting member 28 can be further partitioned by the second insulating member 25, thereby further improving the effect of mutual insulation and isolation between the wall portion 211 and the first current collecting member 28. Among them, by protruding a limiting portion 251 from a side of the second insulating member 25 facing away from the wall portion 211, and the limiting portion 251 is inserted into the through hole 2411 of the first insulating portion 241, the limiting portion 251 of the second insulating member 25 can also play a certain role in limiting and positioning the first insulating member 24, which is beneficial to further reducing the phenomenon of the first insulating member 24 moving or shifting during use, and can improve the stability and quality of the assembly of the first insulating member 24 into the outer shell 21.

[0228] In some embodiments, referring to Figure 6 As shown, the limiting portion 251 is disposed around the electrode terminal 22. That is to say, the limiting portion 251 is an annular structure extending along the circumferential direction of the hole wall surface of the through hole 2411, and the limiting portion 251 is also an annular structure surrounding the outside of the portion of the electrode terminal 22 inserted into the through hole 2411.

[0229] In this embodiment, by setting the limiting portion 251 as an annular structure surrounding the electrode terminal 22, the limiting portion 251 is an annular structure extending circumferentially along the wall surface of the through hole 2411, which is beneficial to further improving the effect of the limiting portion 251 of the second insulating member 25 in limiting and positioning the first insulating member 24, thereby further improving the assembly quality between the first insulating member 24 and the second insulating member 25.

[0230] In some embodiments, as shown in Figure 6 the second insulating member 25 is fixedly connected to the first insulating member 24.

[0231] Exemplarily, the structure in which the second insulating member 25 and the first insulating member 24 are fixedly connected to each other can be various, for example, bonding or heat fusion connection, etc.

[0232] In this embodiment, by fixedly connecting the first insulating member 24 and the second insulating member 25, it is beneficial to improve the structural stability of the assembly of the first insulating member 24 and the second insulating member 25 into the housing 21, and can further reduce the phenomenon of the first insulating member 24 moving or shifting during use.

[0233] According to some embodiments of the present application, please refer to Figure 9 and Figure 10 , Figure 9 which is a cross-sectional view of the battery cell 20 provided by still other embodiments of the present application, Figure 10 and Figure 9 is a partial enlarged view of the B position of the battery cell 20 shown in the figure. The battery cell 20 may further include a second insulating member 25. The second insulating member 25 is disposed on one side of the wall portion 211 facing the electrode assembly 23 along the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, at least a part of the first insulating portion 241 is located between the second insulating member 25 and the wall portion 211, and the second insulating member 25 and the wall portion 211 are configured to cooperate to clamp the first insulating portion 241.

[0234] Wherein, the electrode terminal 22 has a first clamping portion 221. Along the thickness direction X of the wall portion, the first clamping portion 221 is located on one side of the wall portion 211 facing the electrode assembly 23. Correspondingly, the electrode terminal 22 further has a second clamping portion 222 located on the side of the wall portion 211 facing away from the electrode assembly 23 in the thickness direction X of the wall portion. The second clamping portion 222 and the first clamping portion 221 are configured to cooperate to clamp the wall portion 211 to realize the assembly and fastening of the electrode terminal 22 on the wall portion 211.

[0235] Exemplarily, at least a part of the second insulating member 25 is disposed between the wall portion 211 and the first clamping portion 221. The wall portion 211 and the first clamping portion 221 are configured to cooperate to clamp the second insulating member 25. That is to say, the second insulating member 25 is disposed within the housing 21, and at least a part of the second insulating member 25 extends between the wall portion 211 and the first clamping portion 221 of the electrode terminal 22, so that the wall portion 211 and the first clamping portion 221 of the electrode terminal 22 can jointly clamp and fix the second insulating member 25 to assemble and fasten the second insulating member 25 to the wall portion 211. It should be noted that in other embodiments, the second insulating member 25 may also be a structure adhesively bonded, snap-fitted or bolted to the wall portion 211, or may also be a structure adhesively bonded, snap-fitted or bolted to the electrode terminal 22.

[0236] At least a part of the first insulating portion 241 is located between the second insulating member 25 and the wall portion 211. That is to say, at least a part of the first insulating portion 241 extends between the wall portion 211 and the second insulating member 25, so that the wall portion 211 and the second insulating member 25 can jointly clamp and fix the first insulating portion 241 of the first insulating member 24 to assemble and fasten the first insulating member 24 to the wall portion 211. It should be noted that in other embodiments, the first insulating portion 241 of the first insulating member 24 may also be a structure directly assembled and fastened to the wall portion 211 through structures such as adhesive bonding or bolt connection.

[0237] In this embodiment, the second insulating member 25 is disposed on the side of the wall portion 211 facing the electrode assembly 23, and at least a part of the first insulating portion 241 of the first insulating member 24 is located between the second insulating member 25 and the wall portion 211, so that the second insulating member 25 and the wall portion 211 can also cooperate to assemble the first insulating portion 241 to fasten the first insulating member 24 within the housing 21. With this structure, on the one hand, the battery cell 20 can improve the stability of assembling the first insulating member 24 into the housing 21, which is beneficial to alleviating phenomena such as crosstalk or displacement of the first insulating member 24 during use, so as to improve the use reliability of the battery cell 20, and can reduce the difficulty of fastening the first insulating member 24 within the housing 21 to reduce the assembly difficulty of the battery cell 20. On the other hand, the first insulating member 24 can be fixed within the housing 21 by the second insulating member 25 first, so that the risk of damaging the electrode assembly 23 due to the displacement of the first insulating member 24 during the assembly of the electrode assembly 23 into the housing 21 can be reduced, which is beneficial to improving the production quality of the battery cell 20.

[0238] In some embodiments, please continue to refer to Figure 9 and Figure 10As shown, the battery cell 20 may further include a first current collector member 28 disposed between the first tab 232 and the wall portion 211. The first current collector member 28 connects the electrode terminal 22 and the first tab 232. Along the thickness direction X of the wall portion, a second insulating member 25 is located between the wall portion 211 and the first current collector member 28, and the second insulating member 25 is further configured to insulate and isolate the wall portion 211 and the first current collector member 28.

[0239] Wherein, the first current collector member 28 is disposed between the first tab 232 and the wall portion 211, and the first current collector member 28 connects the electrode terminal 22 and the first tab 232. That is to say, along the thickness direction X of the wall portion, the wall portion 211 and the electrode assembly 23 are respectively located on both sides of the first current collector member 28, and the first current collector member 28 functions to connect the electrode terminal 22 and the first tab 232 of the electrode assembly 23 to achieve electrical connection between the electrode terminal 22 and the electrode assembly 23.

[0240] The second insulating member 25 is located between the wall portion 211 and the first current collector member 28, that is, along the thickness direction X of the wall portion, the wall portion 211 and the first current collector member 28 are respectively located on both sides of the second insulating member 25. Correspondingly, since at least a part of the first insulating portion 241 extends between the second insulating member 25 and the wall portion 211, a part of the second insulating member 25 is located on the side of the first insulating portion 241 facing the first tab 232, and the first current collector member 28 is located on the side of the first insulating portion 241 facing the first tab 232, so that a part of the second insulating member 25 is located in the accommodation space 243 jointly defined by the first insulating portion 241 and the second insulating portion 242. Correspondingly, the first current collector member 28 is also located in the accommodation space 243 jointly defined by the first insulating portion 241 and the second insulating portion 242.

[0241] In Figure 10 , the first insulating portion 241 is provided with a through hole 2411. The through hole 2411 penetrates through both sides of the first insulating portion 241 along the thickness direction X of the wall portion. The electrode terminal 22 is inserted into the through hole 2411 and is connected to the first current collector member 28, and a part of the second insulating member 25 is also inserted into the through hole 2411, so that a part of the second insulating member 25 can be located on the side of the first insulating portion 241 facing the first tab 232.

[0242] In this embodiment, a first current collecting member 28 is further disposed inside the outer shell 21. The first current collecting member 28 is disposed between the first tab 232 and the wall portion 211, such that the first current collecting member 28 can connect the electrode terminal 22 and the first tab 232, which is beneficial to reducing the difficulty of electrically connecting the electrode terminal 22 and the first tab 232 to each other. In addition, by disposing the first current collecting member 28 on the side of the second insulating member 25 away from the wall portion 211, a second insulating member 25 is provided between the first current collecting member 28 and the wall portion 211, and the first current collecting member 28 can also be located in the accommodation space 243 of the first insulating member 24. Thus, while the first insulating member 24 insulates and isolates the first tab 232 and the outer shell 21, the first insulating member 24 and the second insulating member 25 can also insulate and isolate the first current collecting member 28 and the outer shell 21, which is beneficial to reducing the short-circuit risk between the first current collecting member 28 and the outer shell 21, and further reducing the short-circuit risk of the battery cell 20, so as to further improve the use reliability of the battery cell 20.

[0243] In some embodiments, referring to Figure 10 as shown, the second insulating member 25 is fixedly connected to the first insulating member 24.

[0244] Exemplarily, the structure in which the second insulating member 25 and the first insulating member 24 are fixedly connected to each other can be various, such as bonding or hot melt connection, etc.

[0245] In this embodiment, by fixedly connecting the first insulating member 24 and the second insulating member 25, on the one hand, the structural stability of the first insulating member 24 disposed between the wall portion 211 and the second insulating member 25 can be further improved to further reduce the phenomenon of the first insulating member 24 moving or shifting during use. On the other hand, it is convenient to first fixedly assemble the first insulating member 24 and the second insulating member 25 and then assemble them together into the outer shell 21, which is beneficial to reducing the difficulty of assembling the first insulating member 24 between the second insulating member 25 and the wall portion 211, and can alleviate the phenomenon of the first insulating member 24 shaking or shifting during the assembly process of the first insulating member 24, which is beneficial to improving the assembly quality of the first insulating member 24.

[0246] It should be noted that the structure of the battery cell 20 is not limited thereto. In some embodiments, referring to Figure 11 and Figure 12 , Figure 11 is a cross-sectional view of the battery cell 20 provided in still some other embodiments of the present application. Figure 12 For Figure 11Partial enlarged view of the battery cell 20 at location C as shown. The battery cell 20 can also have other structures. For example, mounting holes 2111 are provided on the wall portion 211, and the mounting holes 2111 penetrate through the wall portion 211 along the thickness direction X of the wall portion. A part of the electrode terminal 22 is inserted into the mounting holes 2111. The electrode terminal 22 has a first clamping portion 221. Along the thickness direction X of the wall portion, the first clamping portion 221 is located on the side of the wall portion 211 facing the electrode assembly 23. At least part of the first insulating portion 241 is provided between the wall portion 211 and the first clamping portion 221 to insulate and isolate the wall portion 211 and the first clamping portion 221. The first clamping portion 221 is configured to cooperate with the wall portion 211 to clamp the first insulating portion 241.

[0247] Among them, at least part of the first insulating portion 241 is provided between the wall portion 211 and the first clamping portion 221. That is to say, the first clamping portion 221 of the electrode terminal 22 and the wall portion 211 are structures that directly clamp the first insulating portion 241 of the first insulating member 24 to assemble and fasten the first insulating member 24 on the wall portion 211, so that the first insulating member 24 can also play a role in insulating and isolating the first clamping portion 221 and the wall portion 211, and thus it is possible to cancel the setting of the second insulating member 25 between the first clamping portion 221 and the wall portion 211.

[0248] In this embodiment, the electrode terminal 22 has a first clamping portion 221 on the side of the wall portion 211 facing the electrode assembly 23 in the thickness direction X of the wall portion, and at least part of the first insulating portion 241 of the first insulating member 24 is located between the first clamping portion 221 and the wall portion 211, so that the first clamping portion 221 and the wall portion 211 can also cooperate to assemble the first insulating portion 241 to fasten the first insulating member 24 in the housing 21. On the one hand, the battery cell 20 with this structure enables the first insulating member 24 to insulate and isolate the first tab 232 and the housing 21 while also insulating and isolating the first clamping portion 221 and the wall portion 211, so that there is no need to separately provide an insulating component between the first clamping portion 221 and the wall portion 211, which is beneficial to reducing the manufacturing cost of the battery cell 20. On the other hand, it can improve the stability of the first insulating member 24 assembled into the housing 21, which is beneficial to alleviating phenomena such as the first insulating member 24 moving or shifting during use, so as to improve the use reliability of the battery cell 20.

[0249] In some embodiments, referring to Figure 12 As shown, the battery cell 20 may further include a seal 27. The seal 27 is disposed between the electrode terminal 22 and the wall portion 211 to seal the gap between the electrode terminal 22 and the wall portion 211. At least part of the seal 27 is located between the wall portion 211 and the first clamping portion 221, and the seal 27 abuts against the first insulating portion 241.

[0250] Among them, the main body of the electrode terminal 22 penetrates through the mounting hole 2111 along the thickness direction X of the wall portion. The first clamping portion 221 and the second clamping portion 222 are both convexly provided on the outer peripheral surface of the main body of the electrode terminal 22, and the first clamping portion 221 and the second clamping portion 222 are respectively located on both sides of the wall portion 211.

[0251] At least part of the seal 27 is located between the wall portion 211 and the first clamping portion 221, that is, the seal 27 can be wholly or partly located between the wall portion 211 and the first clamping portion 221 in the thickness direction X of the wall portion, so that the wall portion 211 and the first clamping portion 221 can cooperate to clamp at least part of the seal 27. Exemplarily, in Figure 12 part of the seal 27 is located between the wall portion 211 and the first clamping portion 221.

[0252] Exemplarily, in Figure 12 the seal 27 abuts against the first insulating portion 241 along the radial direction Y of the second insulating portion. Of course, in other embodiments, the seal 27 and the first insulating portion 241 may also be structured to abut against each other along the thickness direction X of the wall portion.

[0253] Optionally, part of the seal 27 is disposed between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, so that the seal 27 can also seal the gap between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, so as to achieve the seal 27 sealing the gap between the electrode terminal 22 and the wall portion 211. Of course, in other embodiments, the seal 27 may also be structured to be wholly located between the wall portion 211 and the first clamping portion 221, so that the seal 27 indirectly seals the gap between the electrode terminal 22 and the hole wall surface of the mounting hole 2111 by sealing the gap between the wall portion 211 and the first clamping portion 221.

[0254] In this embodiment, by disposing at least part of the seal 27 between the wall portion 211 and the first clamping portion 221, while the seal 27 plays a sealing role, on the one hand, the first clamping portion 221 and the wall portion 211 can also clamp the seal 27, so as to improve the structural stability and reliability of the seal 27 assembled between the electrode terminal 22 and the hole wall surface of the mounting hole 2111. On the other hand, by structuring the seal 27 and the first insulating portion 241 to abut against each other, the phenomenon of a gap appearing between the seal 27 and the first insulating portion 241 can be reduced, which is beneficial to improving the effect of the first insulating portion 241 and the seal 27 cooperating to insulate and isolate the first clamping portion 221 and the wall portion 211, and further reducing the short-circuit risk between the first clamping portion 221 and the wall portion 211, so as to improve the use reliability of the battery cell 20.

[0255] In some embodiments, the Rockwell hardness of the second insulating portion 242 is less than that of the outer shell 21.

[0256] Exemplarily, the material of the second insulating portion 242 is plastic, plastic or rubber, etc., and the material of the outer shell 21 is copper, iron, aluminum, steel or aluminum alloy, etc.

[0257] In this embodiment, by setting the Rockwell hardness of the second insulating portion 242 to be less than that of the outer shell 21, the phenomenon that the second insulating portion 242 scratches or wears the outer shell 21 during the process of being assembled into the outer shell 21 is alleviated, which is beneficial to reducing the risk of wire drawing or burrs on the outer shell 21, so as to improve the production quality of the battery cell 20.

[0258] According to some embodiments of the present application, refer to Figure 8 As shown, along the thickness direction X of the wall portion, the radial dimension of at least part of the outer peripheral surface of the second insulating portion 242 gradually decreases from the end far from the first insulating portion 241 to the end close to the first insulating portion 241. That is to say, part or the whole of the outer peripheral surface of the second insulating portion 242 is a structure that slopes outward from the end close to the first insulating portion 241 to the end far from the first insulating portion 241.

[0259] Exemplarily, along the thickness direction X of the wall portion, the radial dimension of the whole outer peripheral surface of the second insulating portion 242 is a structure that gradually decreases from the end far from the first insulating portion 241 to the end close to the first insulating portion 241.

[0260] In this embodiment, by setting the radial dimension of at least part of the outer peripheral surface of the second insulating portion 242 to gradually decrease from the end far from the first insulating portion 241 to the end close to the first insulating portion 241, the outer peripheral surface of the second insulating portion 242 can play a certain guiding role during the process of assembling the second insulating portion 242 of the first insulating member 24 into the outer shell 21, which is beneficial to reducing the difficulty of mutual assembly between the second insulating portion 242 and the outer shell 21, and thus can improve the assembly efficiency of the battery cell 20.

[0261] According to some embodiments of the present application, please refer to Figure 8 As shown, along the thickness direction X of the wall portion, the thickness of the first insulating portion 241 is greater than or equal to 0.3 mm and less than or equal to 1.2 mm. That is to say, in Figure 8 the thickness of the first insulating portion 241 in the thickness direction X of the wall portion is D2, satisfying 0.3 mm ≤ D2 ≤ 1.2 mm, that is, the wall thickness of the first insulating portion 241 is D2.

[0262] Exemplarily, the thickness D2 of the first insulating portion 241 in the thickness direction X of the wall portion may be 0.3 mm, 0.32 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, 1.1 mm, 1.15 mm, or 1.2 mm, etc.

[0263] It should be noted that the thickness D2 of the first insulating portion 241 is the thickness of the mostly flat area in the first insulating portion 241 in the thickness direction X of the wall portion, without considering the locally protruding or recessed areas in the first insulating portion 241.

[0264] In this embodiment, the thickness of the first insulating portion 241 of the first insulating member 24 is from 0.3 mm to 1.2 mm. On the one hand, by setting the thickness of the first insulating portion 241 to be greater than or equal to 0.3 mm, the structural strength of the first insulating portion 241 is improved, which is beneficial to enhancing the effect of the first insulating portion 241 insulating and isolating the first tab 232 and the housing 21, and is also beneficial to alleviating phenomena such as damage or warping of the first insulating portion 241 during use, thereby effectively improving the stability and reliability of the first insulating portion 241 insulating and isolating the first tab 232 and the housing 21. On the other hand, by setting the thickness of the first insulating portion 241 to be less than or equal to 1.2 mm, the phenomenon that the first insulating portion 241 occupies too much space in the housing 21 is alleviated, thereby improving the space utilization rate inside the housing 21 and enhancing the energy density of the battery cell 20.

[0265] According to some embodiments of the present application, please continue to refer to Figure 8 As shown, the thickness of the second insulating portion 242 is greater than or equal to 0.05 mm and less than or equal to 0.5 mm. That is to say, in Figure 8 the thickness of the second insulating portion 242 in the radial direction Y of the second insulating portion is D3, satisfying 0.05 mm ≤ D3 ≤ 0.5 mm, that is, the wall thickness of the second insulating portion 242 is D3.

[0266] Exemplarily, the thickness D3 of the second insulating portion 242 in the radial direction Y of the second insulating portion may be 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.48 mm, or 0.5 mm, etc.

[0267] It should be noted that the thickness of the second insulating portion 242 is greater than or equal to 0.05 mm and less than or equal to 0.5 mm, that is, the thickness of any position of the second insulating portion 242 in the radial direction Y of the second insulating portion satisfies being greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0268] In this embodiment, the thickness of the second insulating portion 242 of the first insulating member 24 is from 0.05 mm to 0.5 mm. On the one hand, by setting the thickness of the second insulating portion 242 to be greater than or equal to 0.05 mm, the structural strength of the second insulating portion 242 is improved, which is beneficial to enhancing the effect of the second insulating portion 242 insulating and isolating the first tab 232 and the housing 21, and is also beneficial to alleviating phenomena such as damage or warping of the second insulating portion 242 during use, so as to effectively improve the stability and reliability of the second insulating portion 242 insulating and isolating the first tab 232 and the housing 21. On the other hand, by setting the thickness of the second insulating portion 242 to be less than or equal to 0.5 mm, the phenomenon that the second insulating portion 242 occupies too much space in the housing 21 is alleviated, so that the space utilization rate inside the housing 21 can be improved to enhance the energy density of the battery cell 20.

[0269] According to some embodiments of the present application, referring to Figure 7 and Figure 8 as shown, the first insulating portion 241 and the second insulating portion 242 are integrally formed. That is, the first insulating portion 241 and the second insulating portion 242 are an integral structure formed by an integral forming process.

[0270] Exemplarily, the first insulating portion 241 and the second insulating portion 242 of the first insulating member 24 can be formed by an integral forming process such as injection molding or milling.

[0271] It should be noted that in other embodiments, the first insulating portion 241 and the second insulating portion 242 can also be a split structure, that is, the first insulating portion 241 and the second insulating portion 242 are a split structure, and the first insulating portion 241 and the second insulating portion 242 can be connected to each other through structures such as bonding or clamping.

[0272] In this embodiment, by setting the first insulating portion 241 and the second insulating portion 242 of the first insulating member 24 to be an integral forming structure, the first insulating portion 241 and the second insulating portion 242 are an integral structure, so that the connection strength between the first insulating portion 241 and the second insulating portion 242 can be improved to reduce the phenomenon of the first insulating portion 241 and the second insulating portion 242 separating from each other, which is beneficial to enhancing the stability and reliability of the first insulating member 24 during use.

[0273] In some embodiments, referring to Figure 8As shown, along the thickness direction X of the wall portion, the thickness of the second insulating portion 242 gradually increases from the end far from the first insulating portion 241 to the end close to the first insulating portion 241. That is to say, the thickness of the second insulating portion 242 at the end connected to the first insulating portion 241 is the largest, such that the thickness of the end where the second insulating portion 242 is connected to the first insulating portion 241 is the maximum thickness of the second insulating portion 242, while the thickness of the end of the second insulating portion 242 far from the first insulating portion 241 is the smallest, such that the thickness of the end of the second insulating portion 242 far from the first insulating portion 241 is the minimum thickness of the second insulating portion 242.

[0274] In this embodiment, by setting the thickness of the second insulating portion 242 to gradually increase from the end far from the first insulating portion 241 to the end close to the first insulating portion 241, the second insulating portion 242 has a larger thickness at the end connected to the first insulating portion 241. Thus, on the one hand, it is beneficial to improve the connection reliability between the second insulating portion 242 and the first insulating portion 241, and is beneficial to improve the overall structural stability of the first insulating member 24. On the other hand, it can reduce the forming difficulty of the first insulating portion 241 and the second insulating portion 242, so as to reduce the manufacturing difficulty of the first insulating member 24.

[0275] According to some embodiments of the present application, referring to Figure 3 、 Figure 4 and Figure 5 As shown, the side wall 2123 is cylindrical, and the central axis of the side wall 2123 extends along the thickness direction X of the wall portion.

[0276] Among them, the side wall 2123 is cylindrical, that is to say, the outer shell 21 is a cylindrical structure, and the central axis of the outer shell 21 extends along the thickness direction X of the wall portion. Correspondingly, the end cover 213 of the outer shell 21 is a circular plate-like structure, and the bottom wall 2122 of the housing 212 is also a circular plate-like structure, such that the side wall 2123 is a hollow structure that is open at both ends along its central axis and is cylindrical.

[0277] It should be noted that in other embodiments, the shape of the side wall 2123 can also be cuboid, cube or prism-like, etc.

[0278] In this embodiment, by setting the side wall 2123 of the outer shell 21 to be cylindrical, so that the outer shell 21 is cylindrical, it is convenient to process the battery cell 20 with a cylindrical structure, such that the battery cell 20 has advantages such as high capacity, long cycle life, and wide operating temperature range. In addition, by setting the outer shell 21 to be cylindrical, the electrode assembly 23 can be set to a cylindrical structure with its central axis extending along the thickness direction X of the wall portion, so as to facilitate inserting the first tab 232 of the electrode assembly 23 into the accommodation space 243 of the first insulating member 24, and can reduce the manufacturing difficulty of the first insulating member 24.

[0279] According to some embodiments of the present application, referring to Figure 3 , Figure 4 and Figure 5 as shown, the outer shell 21 may include a housing 212 and an end cap 213. The housing 212 includes an integrally formed side wall 2123 and a bottom wall 2122. The side wall 2123 surrounds the bottom wall 2122. Along the thickness direction X of the wall portion, one end of the side wall 2123 is connected to the bottom wall 2122, and the other end encloses an opening 2121. The side wall 2123 and the bottom wall 2122 jointly define a receiving cavity. The electrode assembly 23 is received in the receiving cavity. The end cap 213 closes the opening 2121, and the bottom wall 2122 is the wall portion 211.

[0280] Wherein, the housing 212 includes an integrally formed side wall 2123 and a bottom wall 2122, that is, the housing 212 is processed by an integral forming process, such as stamping, casting or extrusion molding and other integral forming processes. That is to say, the side wall 2123 and the bottom wall 2122 of the housing 212 are of an integral structure.

[0281] The bottom wall 2122 is the wall portion 211, that is, the wall portion 211 is a wall of the housing 212 opposite to the end cap 213 in the thickness direction X of the wall portion. Correspondingly, that is, the electrode terminal 22 is installed on the bottom wall 2122 of the housing 212. Correspondingly, the first tab 232 is disposed at one end of the electrode assembly 23 facing the bottom wall 2122 of the housing 212 in the thickness direction X of the wall portion. Similarly, the first insulating portion 241 of the first insulator 24 is located between the first tab 232 and the bottom wall 2122 of the housing 212.

[0282] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the bottom wall 2122 of the housing 212 opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with this structure can make the wall portion 211 provided with the electrode terminal 22 away from the end cap 213, so that there is no direct connection relationship between the wall portion 211 and the end cap 213. Thus, the phenomenon that the force generated when the components such as the electrode terminal 22 pull or twist the wall portion 211 acts on the end cap 213 can be alleviated, so as to reduce the risk of connection failure between the end cap 213 and the housing 212, and further is beneficial to reducing the risk of liquid leakage during the use of the battery cell 20.

[0283] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also have other structures. For example, the outer casing 21 may include a housing 212 and an end cap 213. The housing 212 includes a side wall 2123 and a bottom wall 2122 formed integrally. The side wall 2123 surrounds the bottom wall 2122. Along the thickness direction X of the wall portion, one end of the side wall 2123 is connected to the bottom wall 2122, and the other end encloses an opening 2121. The side wall 2123 and the bottom wall 2122 jointly define a receiving cavity, and the electrode assembly 23 is received in the receiving cavity. The end cap 213 closes the opening 2121, and the end cap 213 is the wall portion 211. That is to say, the electrode terminal 22 is installed on the end cap 213 of the outer casing 21. Correspondingly, the first tab 232 is disposed at one end of the electrode assembly 23 facing the end cap 213 in the thickness direction X of the wall portion. Similarly, the first insulating portion 241 of the first insulator 24 is located between the first tab 232 and the end cap 213.

[0284] In this embodiment, by setting the wall portion 211 of the outer casing 21 as the end cap 213 for closing the opening 2121 of the housing 212, the battery cell 20 with this structure facilitates the assembly of the electrode terminal 22 on the end cap 213 and the electrical connection between the electrode terminal 22 and the first tab 232, which is beneficial to reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0285] According to some embodiments of the present application, the present application also provides a battery 100, which includes the battery cell 20 of any of the above solutions.

[0286] Among them, referring to Figure 2 as shown, the battery 100 may further include a box body 10, and the battery cell 20 is received in the box body 10.

[0287] 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 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for receiving the battery cell 20.

[0288] Optionally, 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. 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 both 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.

[0289] Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can be of various shapes, such as a cylinder or a cuboid, etc. Exemplarily, in Figure 2 the housing 10 is a cuboid structure.

[0290] Optionally, the battery cells 20 disposed in the housing 10 can be one or multiple. Exemplarily, in Figure 2 the housing 10 of the battery 100 is provided with multiple battery cells 20. The multiple battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the housing 10. Of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a combined series-parallel connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the housing 10.

[0291] Among them, the battery 100 can also include other structures. For example, the battery 100 can also include a busbar component that connects the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0292] It should be noted that in some embodiments, the battery 100 may not be provided with the housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of the multiple battery cells 20 can be directly assembled to the electrical device to provide electrical energy for the electrical device through the multiple battery cells 20. That is to say, the housing 10 can be a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the housing 10 can be a part of the chassis structure of the vehicle 1000. For example, a part of the housing 10 can become at least a part of the floor of the vehicle 1000, or a part of the housing 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0293] According to some embodiments of the present application, the present application also provides an electrical device, which includes the battery cells 20 in any of the above solutions, and the battery cells 20 are used to provide electrical energy for the electrical device.

[0294] Among them, the electrical device can be any of the above devices or systems that apply the battery cells 20.

[0295] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0296] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing having a wall portion and a side wall, wherein the side wall is arranged around the wall portion; an electrode terminal, disposed on the wall portion; an electrode assembly, contained in the housing, the electrode assembly having a first electrode tab, the first electrode tab being disposed at one end of the electrode assembly close to the wall portion in the thickness direction of the wall portion, the first electrode tab being electrically connected to the electrode terminal; as well as A first insulating member, comprising a first insulating portion and a second insulating portion, wherein at least a portion of the first insulating portion is located between the wall portion and the first pole lug, the second insulating portion is arranged around the first insulating portion, the second insulating portion and the first insulating portion jointly define a receiving space, along the thickness direction of the wall portion, one end of the second insulating portion is connected to the first insulating portion, and at least a portion of the first pole lug is inserted into the receiving space; Wherein, a groove is arranged on the inner circumferential surface of the side wall, the groove is an annular groove extending along the circumference of the side wall, and one end of the second insulating part away from the first insulating part is inserted into the groove.

2. The battery cell according to claim 1, characterized in that: The electrode assembly includes a first pole piece, the first pole piece includes a first body and the first pole ear, the first pole ear is connected to an end of the first body close to the wall portion in the thickness direction of the wall portion; Wherein, along the thickness direction of the wall portion, one end of the second insulating portion away from the first insulating portion extends to between the first main body and the side wall, and the first pole tab is entirely located in the accommodating space.

3. The battery cell according to claim 1, characterized in that: The wall thickness of the side wall is D1, and the groove depth of the groove is H, which satisfies 1 / 3≤H / D1≤1 / 2.

4. The battery cell according to claim 1, characterized in that: The outer peripheral surface of the second insulating portion is interference-fitted with the groove bottom surface of the groove.

5. The battery cell according to claim 4, characterized in that: Along the thickness direction of the wall portion, a notch is provided at one end of the second insulating portion away from the first insulating portion, and the notch penetrates the inner circumferential surface and the outer circumferential surface of the second insulating portion.

6. The battery cell according to claim 5, characterized in that: The second insulating portion is provided with a plurality of the notches, and the plurality of the notches are arranged at intervals along the circumference of the second insulating portion.

7. The battery cell according to claim 5, characterized in that: The electrode assembly includes a first pole piece, a second pole piece and a separator, the first pole piece and the second pole piece have opposite polarities, the first pole piece includes a first body and the first pole ear, the first pole ear is connected to an end of the first body close to the wall portion in the thickness direction of the wall portion, a portion of the separator is disposed between the first pole piece and the second pole piece to separate the first pole piece and the second pole piece, and a portion of the separator is coated on the outside of the electrode assembly; Wherein, along the radial direction of the second insulating portion, the projection of the notch is located within the portion of the isolation film covering the outer side of the electrode assembly, and the radial direction of the second insulating portion is perpendicular to the thickness direction of the wall portion.

8. The battery cell according to claim 1, characterized in that: The electrode assembly includes a first pole piece, a second pole piece and a separator, the first pole piece and the second pole piece have opposite polarities, the first pole piece includes a first body and the first pole ear, the first pole ear is connected to an end of the first body close to the wall portion in the thickness direction of the wall portion, a portion of the separator is disposed between the first pole piece and the second pole piece to separate the first pole piece and the second pole piece, and a portion of the separator is coated on the outside of the electrode assembly; Among them, along the thickness direction of the wall portion, the first electrode tab extends beyond one end of the isolation membrane close to the wall portion, and one end of the isolation membrane covering the outer side of the electrode assembly close to the wall portion is inserted into the accommodating space.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The battery cell further comprises: A first current collecting member is arranged between the first electrode tab and the first insulating portion along the thickness direction of the wall portion, the first current collecting member is connected to the first electrode tab, the first insulating portion is provided with a through hole, the through hole is communicated with the accommodating space, the electrode terminal is inserted into the through hole and connected to the first current collecting member.

10. The battery cell according to claim 9, characterized in that: The first insulating portion is connected to the first current collecting member.

11. The battery cell according to claim 10, characterized in that: The first insulating portion is adhesively connected to the first current collecting member.

12. The battery cell according to claim 9, characterized in that: The battery cell further comprises: a second insulating member, at least partially disposed between the wall portion and the first insulating portion, the second insulating member being configured to insulate and isolate the first current collecting member from the wall portion; Wherein, along the thickness direction of the wall portion, a limiting portion is protruded from a side of the second insulating member away from the wall portion, the limiting portion is inserted into the through hole, and the limiting portion is located between the electrode terminal and the hole wall surface of the through hole.

13. The battery cell according to claim 12, characterized in that: The limiting portion is arranged around the electrode terminal.

14. The battery cell according to claim 12, characterized in that: The second insulating member is fixedly connected to the first insulating member.

15. The battery cell according to any one of claims 1 to 8, characterized in that: The battery cell further comprises: a second insulating member, disposed on a side of the wall portion facing the electrode assembly along a thickness direction of the wall portion; Wherein, along the thickness direction of the wall portion, at least a portion of the first insulating portion is located between the second insulating member and the wall portion.

16. The battery cell according to claim 15, characterized in that: The battery cell further comprises: A first current collecting member, disposed between the first electrode tab and the wall portion, the first current collecting member connecting the electrode terminal and the first electrode tab; Wherein, along the thickness direction of the wall portion, the second insulating member is located between the wall portion and the first current collecting member, and the second insulating member is further configured to insulate and isolate the wall portion and the first current collecting member.

17. The battery cell according to claim 15, characterized in that: The second insulating member is fixedly connected to the first insulating member.

18. The battery cell according to any one of claims 1 to 8, characterized in that: The wall portion is provided with a mounting hole, the mounting hole penetrates the wall portion along the thickness direction of the wall portion, and a portion of the electrode terminal is inserted into the mounting hole; In which, the electrode terminal has a first clamping portion, and along the thickness direction of the wall portion, the first clamping portion is located on the side of the wall portion facing the electrode assembly, and at least part of the first insulating portion is arranged between the wall portion and the first clamping portion to insulate and isolate the wall portion and the first clamping portion.

19. The battery cell according to claim 18, characterized in that: The battery cell further comprises: A sealing member is at least partially located between the wall portion and the first clamping portion, and the sealing member abuts against the first insulating portion.

20. The battery cell according to claim 1, characterized in that: The Rockwell hardness of the second insulating portion is smaller than the Rockwell hardness of the housing.

21. The battery cell according to claim 1, characterized in that: Along the thickness direction of the wall portion, a radial dimension of at least a portion of the outer peripheral surface of the second insulating portion gradually decreases from an end away from the first insulating portion to an end close to the first insulating portion.

22. The battery cell according to claim 1, characterized in that: Along the thickness direction of the wall portion, the thickness of the first insulating portion is greater than or equal to 0.3 mm and less than or equal to 1.2 mm.

23. The battery cell according to claim 1, characterized in that: The thickness of the second insulating portion is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

24. The battery cell according to claim 1, characterized in that The first insulating portion and the second insulating portion are integrally formed.

25. The battery cell according to claim 24, characterized in that: Along the thickness direction of the wall portion, the thickness of the second insulating portion gradually increases from an end far from the first insulating portion to an end close to the first insulating portion.

26. The battery cell according to claim 1, characterized in that: The side wall is cylindrical, and the central axis of the side wall extends along the thickness direction of the wall portion.

27. The battery cell according to claim 1, characterized in that: The housing comprises: The shell comprises the side wall and the bottom wall formed in one piece, the side wall is arranged around the bottom wall, along the thickness direction of the wall portion, one end of the side wall is connected to the bottom wall, and the other end is enclosed to form an opening, the side wall and the bottom wall jointly define a receiving cavity, and the electrode assembly is received in the receiving cavity; an end cap for closing the opening; wherein the bottom wall is the wall portion; or The end cover is the wall portion.

28. A battery, characterized in that: Comprising the battery cell according to any one of claims 1-27.

29. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 27, wherein the battery cell is used to provide electrical energy.

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