Battery cell, battery, electric device, and method and apparatus for manufacturing battery cell

Abstract

The application relates to a battery monomer, a battery, a power utilization device, and a manufacturing method and equipment of the battery monomer. The battery monomer comprises a shell comprising a wall part; an electrode assembly arranged in the shell; and an insulating piece arranged between the electrode assembly and the wall part to insulate and separate the wall part and the electrode assembly; wherein the insulating piece is configured to elastically support the electrode assembly to buffer vibration of the electrode assembly in the shell. When the battery monomer shakes or vibrates to cause the electrode assembly to vibrate relative to the shell, the insulating piece can buffer the vibration of the electrode assembly, reduce the amplitude of the electrode assembly, alleviate the problem that the electrode assembly pulls the electrode lead-out part, avoid the failure of the electrical connection between the electrode assembly and the electrode lead-out part, and also alleviate the rigid collision between the electrode assembly and the shell, thereby protecting the electrode assembly and prolonging the service life of the battery monomer.

Description

TECHNICAL FIELD

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

[0002] In the environment of pursuing energy saving and emission reduction, batteries are widely used in new energy equipment, such as electric vehicles. With the continuous development of battery technology, higher requirements are put forward for the quality and service life of the battery. However, in the use process of the battery, due to the long-term use in a shaking and vibrating environment, the service life of the battery is relatively short. SUMMARY

[0003] The present application aims to provide a battery monomer, a battery, a power consumption device, and a manufacturing method and equipment of the battery monomer, so as to improve the service life of the battery.

[0004] Embodiments of the present application are implemented as follows:

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising: a shell comprising a wall portion; an electrode assembly arranged in the shell; and an insulating piece arranged between the electrode assembly and the wall portion to insulate and separate the wall portion and the electrode assembly; wherein the insulating piece is configured to elastically support the electrode assembly to buffer vibration of the electrode assembly in the shell.

[0006] The electrode assembly is arranged in the shell, and the electrode assembly is generally connected with an electrode lead-out portion arranged on the shell to realize charging and discharging. In the present application, the insulating piece is arranged between the electrode assembly and the wall portion, and the insulating piece is used to insulate and separate the electrode assembly and the wall portion. At the same time, the insulating piece is configured as an elastic structure to support the electrode assembly. When the battery monomer shakes or vibrates to cause the electrode assembly to vibrate relative to the shell, the insulating piece can buffer the vibration of the electrode assembly, absorb the vibration impact, reduce the amplitude of the electrode assembly, and relieve the problem of the electrode assembly pulling the electrode lead-out portion, so as to avoid the failure of the electrical connection between the electrode assembly and the electrode lead-out portion, and also relieve the rigid collision between the electrode assembly and the shell, thereby protecting the electrode assembly and prolonging the service life of the battery monomer.

[0007] In an embodiment of the present application, the shell comprises a shell body and an end cover, the shell body has an opening, the end cover covers the opening, and the wall portion is the end cover.

[0008] In the above technical solution, the electrode assembly, insulating member, and other battery cell components are placed into the housing through the opening. The end cap then covers the opening to seal the housing, providing space for the electrode assembly to undergo electrochemical reactions. Positioning the insulating member between the electrode assembly and the end cap mitigates rigid collisions between the electrode assembly and the end cap, preventing damage to the connection between the end cap and the housing, preventing electrolyte leakage, and thus extending the battery cell's service life.

[0009] In one embodiment of the present application, the insulating member includes: a main body portion, which is arranged between the end cover and the electrode assembly to support the electrode assembly, and the main body portion is configured to generate elastic deformation when the electrode assembly vibrates; a sealing portion, which is formed around the main body portion, and the sealing portion is arranged between the end cover and the shell to seal the end cover and the shell and insulate them from each other.

[0010] In the above technical solution, the main body is located between the end cover and the electrode assembly, and the sealing part is located between the end cover and the shell. The end cover and the shell clamp the sealing part of the insulating part. On the one hand, the end cover and the shell are sealed and insulated from each other. On the other hand, it also plays a role in fixing the sealing part, so that the insulating part is stably installed in the shell, ensuring that the main body always supports the electrode assembly to prevent the insulating part from shifting and losing the insulation and vibration buffering effect, thereby extending the service life of the battery cell.

[0011] In one embodiment of the present application, there is a gap between the main body and the end cover to allow the main body to deform toward the end cover.

[0012] In the above technical solution, a gap is set between the main body and the end cover. This gap prevents the electrode assembly and the insulating part from hitting the end cover when they vibrate within a certain amplitude, thereby further alleviating the rigid collision between the electrode assembly and the end cover. On the other hand, the end cover does not have a reaction force on the electrode assembly, avoiding damage to the electrode assembly due to pressure, thereby extending the service life of the battery cell.

[0013] In one embodiment of the present application, the battery cell further includes a pressure relief mechanism, which is disposed on the end cover and is configured to actuate to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value, and a channel is provided on the main body, which is used to connect the interior of the battery cell and the pressure relief mechanism.

[0014] In the above technical solution, the channel on the main body connects the interior of the battery cell and the pressure relief mechanism, so that the pressure at the pressure relief mechanism is consistent with the pressure inside the battery cell. When the pressure inside the battery cell reaches a threshold, the pressure relief mechanism can be actuated under pressure to release the pressure inside the battery cell, thereby improving the safety of the battery cell.

[0015] In an embodiment of the present application, the body part comprises a support part for supporting the electrode assembly and a connecting part formed around the support part, the connecting part being configured to be elastically deformed when the electrode assembly vibrates.

[0016] In the above technical solution, by setting the body part as the support part and the elastic connecting part, the support part is not easily deformed, and plays a role in stably supporting the electrode assembly, and the connecting part is deformed between the sealing part and the support part, the connecting part does not contact other components such as the electrode assembly and the end cover, the connecting part is not easily interfered, which is conducive to the deformation and recovery of the connecting part, and improves the effect of the insulating part buffering vibration.

[0017] In an embodiment of the present application, the support part protrudes from the connecting part in the direction of the electrode assembly.

[0018] In the above technical solution, the support part protrudes in the direction of the electrode assembly, increasing the distance between the connecting part and the electrode assembly to alleviate the problem of interference of the connecting part due to manufacturing tolerance, and ensuring the role of the insulating part in buffering vibration.

[0019] In an embodiment of the present application, the support part is in a ring structure.

[0020] In the above technical solution, by setting the support part as a ring structure, the middle part of the ring structure is a through channel, which not only saves materials, but also connects the inside of the battery monomer and the pressure relief mechanism, increases the exhaust area, and is conducive to rapid release of the internal pressure of the battery monomer.

[0021] In an embodiment of the present application, the battery monomer further comprises a pressure relief mechanism, the pressure relief mechanism is arranged on the end cover and is configured to actuate to release the internal pressure when the internal pressure or temperature of the battery monomer reaches a threshold value, and the projection of the support part on the end cover overlaps the pressure relief mechanism.

[0022] In the above technical solution, when the pressure relief mechanism actuates, the discharge may be charged, causing the end cover to be charged. Since the end cover and the shell are insulated by the sealing part, the end cover and the shell can be prevented from short-circuiting, avoiding causing greater safety risks. On the other hand, the projection of the support part on the end cover overlaps the pressure relief mechanism, that is, the electrode assembly and the pressure relief mechanism are respectively located on the two sides of the support part. Since the connecting part is deformed between the sealing part and the support part to buffer the vibration of the electrode assembly, the vibration amplitude of the support part and the electrode assembly can be reduced to alleviate the problem of damage to the pressure relief mechanism due to impact, and improve the service life of the battery monomer.

[0023] In an embodiment of the present application, a protrusion is formed on the side of the connecting portion facing the end cover, and a projection of the protrusion on the wall portion does not overlap the pressure relief mechanism.

[0024] In the above technical solution, the protrusion is staggered with the position of the pressure relief mechanism, and when the connecting portion is deformed, the protrusion can abut against the position of the end cover where the pressure relief mechanism is not arranged, so as to limit the connecting portion from continuing to deform, thereby preventing the electrode assembly from colliding with the pressure relief mechanism, so as to avoid the electrode assembly from colliding and damaging the pressure relief mechanism, and prolonging the service life of the battery.

[0025] In an embodiment of the present application, the connecting portion comprises a plurality of connecting arms, and the plurality of connecting arms are distributed at intervals around the support portion, one end of each connecting arm is connected to the outer circumferential surface of the support portion, and the other end is connected to the sealing portion.

[0026] In the above technical solution, by dividing the connecting portion into a plurality of connecting arms at intervals, the plurality of connecting arms at intervals are more easily elastically deformed than one integral connecting portion, and the ability of the connecting portion to buffer vibration is improved; the intervals between the connecting arms serve as exhaust channels, and the exhaust area is increased, which is beneficial to quickly releasing the internal pressure of the battery cell.

[0027] In an embodiment of the present application, the connecting arm comprises a straight section and an inclined section, the straight section extends from the support portion in the radial direction of the shell, the inclined section extends from the straight section in the radial direction of the shell and in the direction away from the electrode assembly, and the inclined section connects the straight section and the sealing portion.

[0028] In the above technical solution, by arranging the connecting arm to have the inclined section and the straight section, the straight section connects the inclined section and the support portion, and the straight sections of the plurality of connecting arms cooperate to prevent the support portion from being positionally offset or tilted in the radial direction, so as to ensure that the support portion stably supports the electrode assembly, and the inclined section further increases the spacing between the support portion and the end cover, further relieving the rigid collision between the electrode assembly and the end cover, and improving the ability of the connecting arm to buffer vibration.

[0029] In an embodiment of the present application, the thickness of the inclined section gradually decreases in the direction of the straight section with respect to the sealing portion.

[0030] In the technical scheme, the thickness of the inclined section is gradually reduced from the sealing part to the flat section, so that the thickness of the part of the connecting arm that bears a large bending moment is large, and the thickness of the part of the connecting arm that bears a small bending moment is small, which can ensure the bearing capacity of the connecting arm and reduce the material cost. On the other hand, the part of the inclined section close to the support part is relatively easy to deform, which can achieve a good vibration buffering effect, and the part of the inclined section close to the sealing part is relatively difficult to deform, which makes the sealing part adjacent to the inclined section not easy to be disturbed, and thus the insulation part can have both good buffering effect and good sealing effect.

[0031] In an embodiment of the present application, a reinforcing rib is formed on the outer circumferential surface of the support part, the reinforcing rib extends along the circumference of the support part, and two ends of the reinforcing rib are connected with two adjacent connecting arms respectively.

[0032] In the technical scheme, the reinforcing rib is arranged on the outer circumferential surface of the support part, and the reinforcing rib is connected with two adjacent connecting arms, so that the structural strength of the support part at the position where no connecting arm is arranged is improved, so as to prevent the support part from being deformed unevenly, improve the stability of the support part, and ensure that the support part stably supports the electrode assembly.

[0033] In an embodiment of the present application, one end of the shell provided with the opening is inwardly folded to form a folded part, an inner wall of the shell is formed with an annular protrusion extending along the circumference of the shell; the end cover comprises an end cover body and a rim part formed around the end cover body, the rim part is located between the folded part and the annular protrusion, and the sealing part is configured to wrap the rim part.

[0034] In the technical scheme, the folded part and the annular protrusion cooperate to clamp the rim part, and the sealing part wraps the rim part, so that the folded part and the annular protrusion press the sealing part respectively, the end cover and the shell are insulated and sealed, and the processing speed and production efficiency are improved.

[0035] In an embodiment of the present application, the sealing part comprises a first part, a second part and a third part, the first part is arranged between the annular protrusion and the rim part, the second part is arranged between the inner wall of the shell and the outer circumferential surface of the rim part, the third part is arranged between the folded part and the rim part, the second part connects the first part and the third part, and the body part is connected to the first part.

[0036] In the technical scheme, the sealing part is formed by connecting the first part, the second part and the third part in sequence, so that the edge part is entirely wrapped, and the insulation effect is good; on the other hand, the three parts of the sealing part are clamped and fixed respectively, the insulation piece is stably installed and is not easy to displace, so as to avoid losing the sealing effect and the effect of buffering vibration, thereby prolonging the service life of the battery monomer.

[0037] In an embodiment of the present application, the end cover body comprises a planar part and a transition part, the transition part is formed around the planar part, the transition part extends from the planar part in the radial direction of the shell and towards the direction close to the electrode assembly, and the transition part connects the planar part and the edge part.

[0038] In the technical scheme, by setting the end cover body to further comprise a planar part and a transition part, the planar part is away from the electrode assembly relative to the edge part, the distance between the planar part and the electrode assembly is increased, so as to avoid the electrode assembly from impacting the end cover due to vibration, further relieve the rigid collision between the electrode assembly and the end cover, and also increase the internal space of the battery monomer and improve the energy density of the battery monomer.

[0039] In an embodiment of the present application, in the direction away from the electrode assembly, the outer surface of the planar part does not exceed the outer surface of the folded part.

[0040] In the technical scheme, the outer surface of the planar part does not exceed the outer surface of the folded part, so as to avoid the planar part from being damaged due to interference with the structure outside the battery monomer, protect the end cover, and prolong the service life of the battery monomer. On the other hand, the planar part does not occupy the external space of the battery monomer, does not increase the overall volume of the battery monomer, does not reduce the energy density of the battery monomer, and ensures that the battery monomer has a high energy density.

[0041] In an embodiment of the present application, one end of the electrode assembly towards the end cover is formed with a first tab, and the battery monomer further comprises a first current collecting member for electrically connecting the first tab and the shell, the first current collecting member is arranged between the electrode assembly and the insulation piece, and the insulation piece abuts against the first current collecting member to elastically support the electrode assembly.

[0042] In the technical scheme, the insulation piece indirectly supports the electrode assembly through the first current collecting member. When the electrode assembly vibrates, the insulation piece can not only buffer the amplitude of the electrode assembly, but also support the first current collecting member, so that the first current collecting member and the electrode assembly maintain a relatively consistent amplitude, reduce the tension at the connecting part of the first current collecting member and the electrode assembly, avoid the connecting part of the first current collecting member and the electrode assembly from being torn, improve the connection reliability of the first current collecting member and the electrode assembly, and thereby improve the service life of the battery monomer.

[0043] In an embodiment of the present application, the electrode assembly is formed with a second tab at one end away from the end cover, and the battery cell further comprises: an electrode terminal insulatedly mounted to the shell; and a second current collecting member for electrically connecting the second tab and the electrode terminal.

[0044] In the above technical solution, the second tab is connected to the electrode terminal through the second current collecting member to realize the output and input of electric energy, the vibration amplitude of the electrode assembly is reduced under the buffering effect of the insulating member, the tension at the connecting part of the second tab and the second current collecting member is reduced, the tension at the connecting part of the second current collecting member and the electrode terminal is reduced, the connection reliability of the second tab, the second current collecting member and the electrode terminal is improved, stable overcurrent is ensured, and the service life of the battery cell is improved.

[0045] In a second aspect, the embodiments of the present application provide a battery comprising the battery cell described above.

[0046] In a third aspect, the embodiments of the present application provide a power consumption device comprising the battery described above.

[0047] In a fourth aspect, the embodiments of the present application provide a manufacturing method of a battery cell, which comprises: providing a shell comprising a wall portion; providing an electrode assembly; providing an insulating member; and placing the electrode assembly and the insulating member into the shell, so that the insulating member is located between the electrode assembly and the wall portion and elastically supports the electrode assembly, so as to insulate and separate the wall portion and the electrode assembly and buffer the vibration of the electrode assembly in the shell.

[0048] In a fifth aspect, the embodiments of the present application provide a manufacturing device of a battery cell, which comprises: a first providing device for providing a shell comprising a wall portion; a second providing device for providing an electrode assembly; a third providing device for providing an insulating member; and an assembling device for placing the electrode assembly and the insulating member into the shell, so that the insulating member is located between the electrode assembly and the wall portion and elastically supports the electrode assembly, so as to insulate and separate the wall portion and the electrode assembly and buffer the vibration of the electrode assembly in the shell. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0050] Figure 1 The structure of the vehicle provided in an embodiment of the present application is intended to;

[0051] Figure 2 An exploded view of a battery cell according to an embodiment of the present application;

[0052] Figure 3 A perspective view of a battery cell according to an embodiment of the present application;

[0053] Figure 4 A cross-sectional view of a battery cell according to an embodiment of the present application;

[0054] Figure 5 An exploded view of a battery cell according to an embodiment of the present application;

[0055] Figure 6 A partial enlarged view of Figure 4

[0056] Figure 7 A plan view of an insulating member according to an embodiment of the present application;

[0057] Figure 8 A cross-sectional view of an insulating member according to an embodiment of the present application;

[0058] Figure 9 A perspective view of an insulating member according to an embodiment of the present application;

[0059] Figure 10 A perspective view of an end cover according to an embodiment of the present application;

[0060] Figure 11 An exploded view of a battery cell and an electrode assembly thereof according to an embodiment of the present application;

[0061] Figure 12 A flowchart of a manufacturing method of a battery cell according to an embodiment of the present application;

[0062] Figure 13 A schematic block diagram of a manufacturing apparatus of a battery cell according to an embodiment of the present application.

[0063] ​Icon: 1000-vehicle; 100-battery; 101-box; 1011-first box part; 1012-second box part; 1-battery cell; 11-outer shell; 11a-wall part; 111-housing; 1111-side wall; 11111-folded part; 11112-annular protrusion; 1112-bottom wall; 112-end cover; 1121-end cover body; 11211-flat part; 11212-transition part; 1122-edge part; 12-electrode assembly; 121-main body part; 122-first tab; 123-second tab; 13-insulating piece; 131-body part; 1311-support part; 13111-annular structure; 13112-second channel; 1312-connection part; 13121-first channel; 13122-connection arm; 131221-protrusion; 131222-flat section; 131223-inclined section; 1313-stiffener; 132-sealing part; 1321-first part; 1322-second part; 1323-third part; 14-pressure relief mechanism; 141-groove; 15-first current collecting member; 16-electrode terminal; 17-second current collecting member; 200-motor; 300-controller; 400-manufacturing equipment; 401-first providing device; 402-second providing device; 403-third providing device; 404-assembling device; D-gap; H-height direction of battery cell. DETAILED DESCRIPTION

[0064] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "include," "includes" and "including" in the description and the claims herein and the above summary are intended to be inclusive of instances of the description and the claims herein and the above summary where the equivalent terminology is used in the description and the claims herein and the above summary. The use of the terms "first," "second," and the like in the description and the claims herein is intended to indicate different objects rather than to imply those objects are in a particular order or priority.

[0066] Reference to "an embodiment" or "the embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" or "in the embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive.

[0067] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0068] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists, A and B exist, and B exists. In addition, the character " / " in this application generally represents that the front and rear associated objects are a "or" relationship.

[0069] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the application.

[0070] "Multiple" appearing in this application means two or more (including two).

[0071] In this application, the battery monomer can include a lithium ion secondary battery monomer, a lithium ion primary battery monomer, a lithium-sulfur battery monomer, a sodium lithium ion battery monomer, a sodium ion battery monomer or a magnesium ion battery monomer, etc. The embodiments of the application are not limited thereto.

[0072] The battery mentioned in the embodiments of the application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in this application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery monomers. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomer.

[0073] The battery cell comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The separator is used to be arranged between the positive electrode tab and the negative electrode tab to insulate the positive electrode tab and the negative electrode tab and avoid short circuit.

[0074] The battery cell further comprises a shell for accommodating the electrode assembly, the electrolyte and the like, and the shell is also provided with an electrode lead-out part connected with the tab of the electrode assembly to realize the charging and discharging of the electrode assembly.

[0075] At present, in the environment of pursuing energy saving and emission reduction, the application of batteries is more and more extensive, not only being applied to energy storage power systems such as hydroelectric, thermal, wind and solar power stations, but also being widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous development of battery technology, higher requirements are put forward for the quality and service life of the battery.

[0076] The inventors noticed that when the battery is in a long-term shaking and vibrating use environment, for example, the battery is applied to an electric vehicle, the service life of the battery is short. Research found that when the battery is in a shaking or vibrating use environment, the electrode assembly is easy to move inside the battery cell, causing the connection part of the electrode assembly and the electrode lead-out part to be pulled or even torn, for example, the tab of the electrode assembly is torn, or the welding part of the tab and the electrode lead-out part is torn, further causing the electrical connection between the electrode assembly and the electrode lead-out part to fail, and the battery cell cannot be charged and discharged.

[0077] In order to alleviate the problem that the electrode assembly vibration causes the short service life of the battery cell, it is considered to reduce the gap between the electrode assembly and the shell, so as to prevent the electrode assembly from moving inside the shell, for example, to increase the size of the electrode assembly, and to make the electrode assembly fit in the shell. However, this will cause the electrode assembly to be under pressure, and the electrode assembly under pressure is easy to deform and drop powder (i.e. the active material coated on the electrode tab falls off), further causing the problem of lithium precipitation, affecting the service life of the battery. In addition, if the electrode assembly and the shell are in complete abutment, the positive electrode and the negative electrode of the electrode assembly are also easy to be short-circuited through the shell.

[0078] Based on the above consideration, in order to solve the problem of short service life of the battery, the inventors have designed a battery cell by arranging an insulating part between the electrode assembly and the wall of the shell, which is used to insulate the electrode assembly and the wall, and to elastically support the electrode assembly to buffer the vibration of the electrode assembly inside the shell.

[0079] When the battery monomer is in a shaking or vibrating environment, the electrode assembly has a tendency to vibrate relative to the shell, the vibration is transmitted to the insulating piece, the insulating piece is elastically deformed to buffer the vibration, the amplitude of the electrode assembly is reduced, the tearing problem of the connection part between the electrode assembly and the electrode lead-out part is alleviated, the electrical connection between the electrode assembly and the electrode lead-out part is prevented from being invalid, and the service life of the battery monomer is improved.

[0080] Since the electrode assembly and the wall of the shell are elastically abutted by the insulating piece, the insulating piece can prevent the electrode assembly from contacting and conducting electricity with the wall of the shell, and effectively reduce the risk of short circuit.

[0081] When the electrode assembly moves, it is also easy to have a rigid collision with the shell, causing the electrode assembly to have a problem of powder falling (that is, the active material coated on the pole piece falls off), the insulating piece deforms between the electrode assembly and the wall, and the rigid collision between the electrode assembly and the shell is also alleviated, thereby protecting the electrode assembly from being torn by the rigid collision and falling off, preventing the problem of lithium precipitation, and further prolonging the service life of the battery monomer.

[0082] In addition, after the electrode assembly is used for a period of time, the tab of the electrode assembly can be further compressed, the insulating piece elastically supported between the electrode assembly and the wall is deformed to compensate for the space generated by the compression of the tab, so that the electrode assembly remains in an elastically abutted state, ensures the buffering effect of the insulating piece, and improves the service life of the battery monomer.

[0083] The battery monomer 1 disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle 1000, a ship or an aircraft. The power supply system of the electric device can be composed of the battery monomer 1, the battery 100 and the like disclosed in the present application, so that the battery monomer 1, the battery 100 and the like disclosed in the present application are beneficial to alleviate and automatically adjust the deterioration of the swelling force of the battery cell, compensate for the consumption of the electrolyte, and improve the stability of the performance of the battery 100 and the service life of the battery 100.

[0084] The embodiments of the present application provide an electric device using the battery 100 as a power supply. The electric device can be, but is not limited to, a vehicle 1000, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0085] The following embodiments are described by taking the vehicle 1000 as an example for convenience of illustration.

[0086] As shown in Figure 1 , a vehicle 1000 is shown, which can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The vehicle 1000 can be provided with a battery 100, a controller 300 and a motor 200, and the controller 300 is used to control the power supply of the battery 100 to the motor 200. For example, the battery 100 can be arranged at the bottom, the front or the rear of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as the operating power source of the vehicle 1000, and can be used for the circuit system of the vehicle 1000, for example, for the power demand of the vehicle 1000 during starting, navigation and running. In another embodiment of the application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, to replace or partially replace the fuel or natural gas to provide driving power for the vehicle 1000.

[0087] In order to meet different power demand, as shown in Figure 2 , the battery 100 can include a plurality of battery monomers 1, wherein the plurality of battery monomers 1 can be connected in series, in parallel or in mixed connection, and the mixed connection means a mixture of series connection and parallel connection. The battery 100 can also be referred to as a battery 100 pack. Alternatively, the plurality of battery monomers 1 can be connected in series, in parallel or in mixed connection to form a battery 100 module, and a plurality of battery 100 modules are connected in series, in parallel or in mixed connection to form the battery 100. That is, the plurality of battery monomers 1 can be directly connected to form the battery 100, or can be connected to form the battery 100 module first, and then the battery 100 module is connected to form the battery 100.

[0088] The battery 100 may also include a housing 101 (or a cover), which has a hollow interior and houses multiple battery cells 1. The housing 101 may include two housing portions, referred to herein as a first housing portion 1011 and a second housing portion 1012, which are snap-fitted together. The shapes of the first housing portion 1011 and the second housing portion 1012 may be determined based on the shape of the combination of multiple battery cells 1, and the first housing portion 1011 and the second housing portion 1012 may each have an opening. For example, the first housing portion 1011 and the second housing portion 1012 may both be hollow rectangular parallelepipeds, each with only one open face. The opening of the first housing portion 1011 and the opening of the second housing portion 1012 are arranged opposite to each other, and the first housing portion 1011 and the second housing portion 1012 snap-fit ​​together to form a housing 101 having a closed chamber. One of the first housing portion 1011 and the second housing portion 1012 may be a rectangular parallelepiped with an opening, and the other may be a cover structure to seal the opening of the rectangular parallelepiped. Multiple battery cells 1 are connected in parallel, series, or in a mixed combination and then placed within the housing 101 formed by snapping the first housing portion 1011 and the second housing portion 1012 together.

[0089] Optionally, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar component (not shown in the figure), which is used to achieve electrical connection between multiple battery cells 1, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between battery cells 1 by connecting the electrode lead-out portion of the battery cell 1. Furthermore, the busbar component can be fixed to the electrode lead-out portion of the battery cell 1 by welding. The electrical energy of multiple battery cells 1 can be further led out through the box 101 through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0090] The following describes in detail any battery cell 1. Figure 3 and Figure 4 As shown, the battery cell 1 includes a housing 11, an electrode assembly 12, and an insulating member 13. The housing 11 includes a wall portion 11a, and the electrode assembly 12 is disposed within the housing 11. The insulating member 13 is disposed between the electrode assembly 12 and the wall portion 11a to insulate and separate the wall portion 11a from the electrode assembly 12. The insulating member 13 is configured to elastically support the electrode assembly 12 to buffer vibration of the electrode assembly 12 within the housing 11.

[0091] It should be noted that the insulating member 13 may directly support the electrode assembly 12 or indirectly support the electrode assembly 12 , that is, other functional components may exist between the electrode assembly 12 and the insulating member 13 .

[0092] The electrode assembly 12 includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell 1 mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collecting portion and a positive electrode tab, and the positive electrode current collecting portion is coated with the positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting portion and a negative electrode tab, and the negative electrode current collecting portion is coated with the negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene), PE (polyethylene), or the like.

[0093] The insulating member 13 is an elastic member made of an insulating material. For example, an elastic pad made of rubber material or plastic material; an elastic structure made of rubber material or plastic material; an elastic structure made of high-damping alloy, and the outside of the elastic structure is coated with rubber material or plastic material.

[0094] Optionally, the shell 11 can also be used to accommodate an electrolyte, such as an electrolyte. Optionally, the material of the shell 11 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc., and the embodiments of the present application do not make special limitations. The shell 11 is a hollow structure, and the inside of the shell 11 forms a space for accommodating the electrode assembly 12. The shape of the shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, the shell 11 can be selected as a cylindrical shell; if the electrode assembly 12 is a cuboid structure, the shell 11 can be selected as a cuboid shell. Optionally, the electrode assembly 12 and the shell 11 are both cylindrical, the height direction H of the battery cell is the axis direction of the cylinder, and the wall portion 11a is the end wall of the shell 11 along one end of the battery cell in the height direction H.

[0095] As Figure 4As shown, the insulating member 13 is supported between the wall portion 11a and the electrode assembly 12, and will be elastically deformed when the electrode assembly 12 is relatively close to or far away from the wall portion 11a. When the battery monomer 1 is shaken or vibrated to cause the electrode assembly 12 to vibrate relative to the shell 11, the insulating member 13 at least buffers the vibration of the electrode assembly 12 along the height direction H of the battery monomer, reduces the amplitude of the electrode assembly 12, alleviates the problem of the connecting portion 1312 of the electrode assembly 12 and the electrode lead being pulled, so as to avoid the failure of the electrical connection between the electrode assembly 12 and the electrode lead, and also can alleviate the rigid collision between the electrode assembly 12 and the shell 11, prevent the electrode assembly 12 from being short-circuited by being overlapped with the wall portion 11a of the shell 11, thereby protecting the electrode assembly 12 and further prolonging the service life of the battery monomer 1. When the tab of the electrode assembly 12 is further compressed during use, the insulating member 13 can also compensate for the space generated by the compression of the tab, so that the electrode assembly 12 remains in an elastically abutting state, ensures the buffering effect of the insulating member 13, and improves the service life of the battery monomer 1.

[0096] According to some embodiments of the present application, optionally, in combination with Figure 4 and Figure 5 As shown, the shell 11 includes a shell body 111 and an end cover 112, the shell body 111 has an opening (not shown in the figure), and the end cover 112 covers the opening. The aforementioned wall portion 11a is the end cover 112.

[0097] The shell body 111 is a component for accommodating functional components such as the electrode assembly 12 and the electrolyte. The shell body 111 can be of various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Optionally, when the shell 11 is a cylinder, the shell body 111 is a part of the cylinder. The shell body 111 includes a side wall 1111 and a bottom wall 1112. The side wall 1111 is enclosed, and the bottom wall 1112 closes one end of the side wall 1111. The other end of the side wall 1111 forms an opening opposite the bottom wall 1112.

[0098] The end cover 112 refers to a component that covers the opening of the shell body 111 to isolate the internal environment of the battery monomer 1 from the external environment. Without limitation, the shape of the end cover 112 can be adapted to the shape of the shell body 111 to fit the shell body 111. Optionally, when the shell 11 is a cylinder, the end cover 112 is another part of the cylinder. Optionally, the end cover 112 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 112 is not easily deformed when subjected to extrusion and collision, so that the battery monomer 1 can have higher structural strength, and the safety performance can also be improved.

[0099] The shell 111 and the end cover 112 can be independent components, and an opening can be provided on the shell 111, and the end cover 112 is used to cover the opening to form the internal environment of the battery monomer 1. Without limitation, the end cover 112 and the shell 111 can also be integrated, specifically, the end cover 112 and the shell 111 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 111, the end cover 112 is used to cover the shell 111.

[0100] The connecting part 1312 of the end cover 112 and the shell 111 has relatively low structural strength, and by locating the insulating piece 13 between the electrode assembly 12 and the end cover 112, the rigid collision between the electrode assembly 12 and the end cover 112 is prevented to avoid damaging the connecting part 1312 of the end cover 112 and the shell 11, causing liquid leakage, and further prolonging the service life of the battery monomer 1.

[0101] Since the insulating piece 13 insulates and isolates the electrode assembly 12 and the end cover 112, the end cover 112 can be electrified, reducing the risk of short circuit caused by electrification of the end cover 112.

[0102] According to some embodiments of the present application, optionally, as shown in Figure 6 The insulating piece 13 includes a body part 131 and a sealing part 132. The body part 131 is arranged between the end cover 112 and the electrode assembly 12 to support the electrode assembly 12, and the body part 131 is configured to elastically deform when the electrode assembly 12 vibrates. The sealing part 132 is formed around the body part 131, and the sealing part 132 is arranged between the end cover 112 and the shell 111 to seal and insulate the end cover 112 and the shell 111.

[0103] The body part 131 of the insulating piece 13 is arranged between the end cover 112 and the electrode assembly 12 as an elastic structure to insulate and isolate the end cover 112 and the electrode assembly 12, and when the electrode assembly 12 vibrates relative to the shell 11, the body part 131 elastically deforms to buffer the vibration, reduce the amplitude of the electrode assembly 12, alleviate the tension problem of the electrode assembly 12 and the electrode lead-out part, avoid the failure of the electrical connection between the electrode assembly 12 and the electrode lead-out part, also alleviate the rigid collision between the electrode assembly 12 and the end cover 112 and the bottom wall 1112, prevent the electrode assembly 12 and the end cover 112 from being overlapped to cause short circuit, and prolong the service life of the battery monomer 1.

[0104] The sealing portion 132 of the insulating piece 13 is arranged between the end cover 112 and the shell 111 as an insulating sealing structure, and insulates and separates the end cover 112 and the shell 111 to reduce the risk of short circuit. At the same time, the end cover 112 and the shell 111 cooperate to compress the sealing portion 132 to achieve a sealed connection, thereby reducing the risk of liquid leakage at the connection position of the end cover 112 and the shell 111, and improving the service life of the battery monomer 1. On the other hand, the sealing portion 132 is compressed by the end cover 112 and the shell 111, which also plays a role in fixing the sealing portion 132. As a result, the insulating piece 13 is stably installed in the shell 11, so as to prevent the insulating piece 13 from being displaced, and ensure that the body portion 131 supports the electrode assembly 12 to play the role of insulation and buffering vibration, thereby prolonging the service life of the battery monomer 1.

[0105] According to some embodiments of the present application, optionally, as shown in Figure 6 , the body portion 131 and the end cover 112 have a gap D therebetween to allow the body portion 131 to deform towards the end cover 112.

[0106] The gap D between the body portion 131 and the end cover 112 means that the body portion 131 is not in contact with the end cover 112, or the body portion 131 is not in complete contact with the end cover 112, that is, the body portion 131 and the end cover 112 are not in contact at least in some positions.

[0107] By providing a gap D between the body portion 131 and the end cover 112, the gap D allows the electrode assembly 12 and the insulating piece 13 to vibrate within a certain amplitude without colliding with the end cover 112, thereby further relieving the rigid collision between the electrode assembly 12 and the end cover 112. On the other hand, the end cover 112 does not have a reaction force on the electrode assembly 12, avoiding damage to the electrode assembly 12 due to pressure, thereby prolonging the service life of the battery monomer 1.

[0108] According to some embodiments of the present application, optionally, as shown in Figure 5 and Figure 6 , the battery monomer 1 further comprises a pressure relief mechanism 14 arranged in the end cover 112 and configured to actuate to release internal pressure when the internal pressure or temperature of the battery monomer 1 reaches a threshold value. The body portion 131 is provided with a channel for communicating the inside of the battery monomer 1 and the pressure relief mechanism 14.

[0109] The pressure relief mechanism 14 refers to an element or component that actuates to release internal pressure or temperature when the internal pressure or temperature of the battery monomer 1 reaches a predetermined threshold value. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte and the separator in the battery monomer 1.

[0110] "Actuation" as referred to in the present application means that the pressure relief mechanism 14 is activated or actuated to a state in which the internal pressure and temperature of the battery cell 1 can be released. The actuation of the pressure relief mechanism 14 can include, but is not limited to, at least one of the following: at least a portion of the pressure relief mechanism 14 is broken, cracked, torn or opened, etc. When the pressure relief mechanism 14 is actuated, the high temperature and pressure material inside the battery cell 1 is discharged as an emission from the actuated portion. In this way, the battery cell 1 can be released at a controllable pressure or temperature, thereby avoiding a potentially more serious accident.

[0111] The emission from the battery cell 1 as referred to in the present application includes, but is not limited to, electrolyte, positive and negative electrode sheets that are dissolved or split, fragments of the separator, high temperature and pressure gas generated by the reaction, flame, etc.

[0112] The pressure relief mechanism 14 on the battery cell 1 has an important influence on the safety of the battery 100. For example, when a short circuit, overcharge or the like occurs, thermal runaway can occur inside the battery cell 1, resulting in a sudden increase in pressure or temperature. In this case, the internal pressure and temperature can be released outwardly by actuating the pressure relief mechanism 14 to prevent the battery cell 1 from exploding or catching fire.

[0113] The pressure relief mechanism 14 can take the form of, for example, a rupture disc, a gas valve, a pressure relief valve or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, the pressure relief mechanism 14 is actuated or a weak structure provided in the pressure relief mechanism 14 is broken, thereby forming a through hole or passage for the internal pressure or temperature to be released. The pressure relief mechanism 14 can also be integrally formed on the end cover 112, for example, a portion of the end cover 112 is thinned to form a weak area, and the weak area is used as the pressure relief mechanism 14. For example, as shown in Figs. 1 and 2, the end cover 112 is provided with a groove 141, thereby reducing the thickness of the end cover 112, and the area enclosed by the groove 141 is used as the pressure relief mechanism 14. When the internal pressure or temperature of the battery cell 1 reaches a threshold, the end cover 112 is cracked along the groove 141, thereby causing the pressure relief mechanism 14 to be separated from the end cover 112, and a through hole is formed in the end cover 112 for the emission to be released. Figure 6 and Figure 10 As shown in Figs. 1 and 2, the end cover 112 is provided with a groove 141, thereby reducing the thickness of the end cover 112, and the area enclosed by the groove 141 is used as the pressure relief mechanism 14. When the internal pressure or temperature of the battery cell 1 reaches a threshold, the end cover 112 is cracked along the groove 141, thereby causing the pressure relief mechanism 14 to be separated from the end cover 112, and a through hole is formed in the end cover 112 for the emission to be released. Alternatively, the groove 141 can not be 360°-enclosed, so that the pressure relief mechanism 14 is partially connected to the end cover 112. When the internal pressure or temperature of the battery cell 1 reaches a threshold, the end cover 112 is cracked along the groove 141, thereby causing a portion of the pressure relief mechanism 14 to be separated from the end cover 112, and a through hole is formed in the end cover 112 for the emission to be released. The other portion of the pressure relief mechanism 14 is connected to the end cover 112, so that the pressure relief mechanism 14 will not be blown away by the emission, thereby avoiding a potential safety hazard.

[0114] The interior of the battery cell 1 refers to the space for accommodating the electrode assembly 12 formed between the end cap 112 and the inner wall of the housing 111 after the end cap 112 covers the opening of the housing 111. In this application, it refers to the space for accommodating the electrode assembly 12 formed by the insulating member 13 and the housing 111.

[0115] like Figure 7 As shown, the channels on the body portion 131 include a first channel 13121 and a second channel 13112. The second channel 13112 is located in the middle region of the body portion 131, and the first channel 13121 is located outside the middle region of the body portion 131. Optionally, the body portion 131 may have the first channel 13121, the second channel 13112, or both the first channel 13121 and the second channel 13112.

[0116] The channel on the main body 131 is used to connect the interior of the battery cell 1 and the pressure relief mechanism 14, so that the pressure on the pressure relief mechanism 14 is consistent with the pressure inside the battery cell 1. When the pressure inside the battery cell 1 reaches a threshold value, it is ensured that the pressure relief mechanism 14 can be actuated under pressure, and the emissions inside the battery cell 1 can reach the pressure relief mechanism 14 through the channel so as to be discharged through the pressure relief mechanism 14, thereby reducing the pressure inside the battery cell 1 and improving the safety of the battery cell 1.

[0117] When the pressure relief mechanism 14 is actuated, the discharge may be charged, causing the end cover 112 to be charged. Since the end cover 112 and the shell 111 are insulated by the sealing portion 132, a short circuit between the end cover 112 and the shell 111 can be prevented, thereby avoiding causing greater safety risks.

[0118] According to some embodiments of the present application, optionally, as Figure 6 As shown, the main body 131 includes a supporting portion 1311 and a connecting portion 1312. The supporting portion 1311 is used to support the electrode assembly 12. The connecting portion 1312 is formed around the supporting portion 1311. The connecting portion 1312 is used to connect the supporting portion 1311 and the sealing portion 132. The connecting portion 1312 is configured to generate elastic deformation when the electrode assembly 12 vibrates.

[0119] The support portion 1311 is a relatively non-deformable portion of the main body 131. The support portion 1311 always abuts against one end of the electrode assembly 12 to provide stable support for the electrode assembly 12. The support portion 1311 may abut against one end of the electrode assembly 12 directly or indirectly through other functional components.

[0120] The connection portion 1312 is a relatively easily deformed portion of the body portion 131, and mainly buffers vibration through elastic deformation of the connection portion 1312.

[0121] Since the sealing portion 132 is fixed, the position of the support portion 1311 is relatively stable, the connection portion 1312 is connected between the sealing portion 132 and the support portion 1311, the connection portion 1312 deforms between the sealing portion 132 and the support portion 1311, the connection portion 1312 does not contact other components such as the electrode assembly 12 and the end cover 112, the connection portion 1312 is not easily interfered, which is conducive to the deformation and recovery of the connection portion 1312, and improves the effect of buffering vibration of the insulating piece 13.

[0122] According to some embodiments of the present application, optionally, as shown in Figure 6 The support portion 1311 protrudes from the connection portion 1312 in the direction of the electrode assembly 12.

[0123] The support portion 1311 protrudes from the connection portion 1312 in the direction of the electrode assembly 12 means that, along the height direction H of the battery monomer, the side of the support portion 1311 close to the electrode assembly 12 exceeds the side of the connection portion 1312 close to the electrode assembly 12.

[0124] Since the support portion 1311 protrudes in the direction of the electrode assembly 12, the distance between the connection portion 1312 and the electrode assembly 12 is increased, so as to prevent the connection portion 1312 from contacting the electrode assembly 12 (or contacting other functional components arranged at the end of the electrode assembly 12) due to manufacturing tolerance, and further avoid interference of the connection portion 1312.

[0125] According to some embodiments of the present application, optionally, as shown in Figure 7 The support portion 1311 is a ring structure 13111.

[0126] The support portion 1311 is a ring structure 13111 means that the middle part of the support portion 1311 forms a through channel. By arranging the support portion 1311 as a ring structure 13111, not only the material can be saved, but also the inside of the battery monomer 1 and the pressure relief mechanism 14 can be communicated, the exhaust area is increased, which is conducive to rapid release of the internal pressure of the battery monomer 1. Optionally, the through channel formed in the middle part of the ring structure 13111 can be a second channel 13112.

[0127] According to some embodiments of the present application, optionally, as shown in Figure 5 and Figure 6 The battery monomer 1 further includes a pressure relief mechanism 14, the pressure relief mechanism 14 is arranged on the end cover 112 and is configured to actuate to release the internal pressure when the internal pressure or temperature of the battery monomer 1 reaches a threshold value, and the projection of the support portion 1311 on the end cover 112 overlaps the pressure relief mechanism 14.

[0128] Along the height direction H of the battery cell, the position of the support portion 1311 corresponds to the position of the pressure relief mechanism 14, and the electrode assembly 12 and the pressure relief mechanism 14 are respectively located on both sides of the support portion 1311. Since the connecting portion 1312 is deformed between the sealing portion 132 and the support portion 1311, the vibration amplitude of the support portion 1311 and the electrode assembly 12 can be reduced, thereby alleviating the problem of damage to the pressure relief mechanism 14 due to impact, thereby improving the service life of the battery cell 1.

[0129] According to some embodiments of the present application, optionally, in combination with Figure 6 and Figure 8 As shown, a protrusion 131221 is formed on the side of the connecting portion 1312 facing the end cover 112 , and the projection of the protrusion 131221 on the wall portion 11 a does not overlap with the pressure relief mechanism 14 .

[0130] The protrusion 131221 is located on the side of the connecting portion 1312 facing the end cover 112 (i.e., the wall portion 11a), and the protrusion 131221 is staggered from the position of the pressure relief mechanism 14. When the connecting portion 1312 is deformed, the protrusion 131221 can contact the end cover 112 to limit the connecting portion 1312 from continuing to deform, thereby preventing the electrode assembly 12 from hitting the pressure relief mechanism 14, so as to prevent the electrode assembly 12 from hitting and damaging the pressure relief mechanism 14, thereby improving the service life of the battery 100.

[0131] According to some embodiments of the present application, optionally, in combination with Figure 7 and Figure 8 As shown, the connecting portion 1312 includes a plurality of connecting arms 13122 , which are spaced apart around the supporting portion 1311 , one end of each connecting arm 13122 is connected to the outer circumference of the supporting portion 1311 , and the other end is connected to the sealing portion 132 .

[0132] like Figure 7 As shown, the connecting portion 1312 is divided into a plurality of spaced connecting arms 13122. The term "plurality" used herein refers to two or more, such as three.

[0133] By dividing the connecting portion 1312 into a plurality of spaced-apart connecting arms 13122, the plurality of connecting arms 13122 are more susceptible to elastic deformation than the integral connecting portion 1312, thereby improving the vibration-absorbing capability of the connecting portion 1312. Furthermore, the plurality of connecting arms 13122 are spaced-apart circumferentially around the supporting portion 1311. This means that the plurality of connecting arms 13122 collectively provide radial support to the supporting portion 1311, thereby balancing the radial forces on the supporting portion 1311 and maintaining a stable position relative to the electrode assembly 12. The radial direction referred to herein refers to a direction perpendicular to the height direction H of the battery cell.

[0134] Optionally, the interval of the connecting arm 13122 can be used as the first channel 13121, which can increase the area of the exhaust channel and facilitate the rapid release of the internal pressure of the battery monomer 1.

[0135] According to some embodiments of the present application, optionally, as shown in Figure 8 The connecting arm 13122 includes a straight section 131222 and an inclined section 131223. The straight section 131222 extends radially from the support portion 1311 along the shell 111, and the inclined section 131223 extends radially from the straight section 131222 along the shell 111 and away from the electrode assembly 12. The inclined section 131223 connects the straight section 131222 and the sealing portion 132.

[0136] By arranging the connecting arm 13122 to have the inclined section 131223 and the straight section 131222, and the straight section 131222 connecting the inclined section 131223 and the support portion 1311, the straight sections 131222 of the plurality of connecting arms 13122 cooperate to prevent the support portion 1311 from being displaced or tilted radially, thereby ensuring that the support portion 1311 stably supports the electrode assembly 12.

[0137] On the other hand, the sealing portion 132 is relatively close to the end cover 112, the support portion 1311 and the straight section 131222 are relatively close to the electrode assembly 12, and the inclined section 131223 is located between the straight section 131222 and the sealing portion 132 to serve as a transition, so that the distance between the support portion 1311 and the end cover 112 is increased, further relieving the rigid collision between the electrode assembly 12 and the end cover 112, and improving the ability of the connecting arm 13122 to buffer vibration.

[0138] In addition, when the tab is further compressed in use, the deformation of the inclined section 131223 can compensate for the space generated by the compression of the tab, so that the electrode assembly 12 remains in an elastically abutting state, ensuring the buffering effect of the insulating piece 13 and improving the service life of the battery monomer 1.

[0139] According to some embodiments of the present application, optionally, as shown in Figure 8 The thickness of the inclined section 131223 gradually decreases in the direction from the sealing portion 132 to the straight section 131222.

[0140] As shown in Figure 8As shown, the connecting arm 13122 can be regarded as a cantilever structure with one end fixed to the sealing portion 132. The electrode assembly 12 acts on the end of the connecting arm 13122 away from the sealing portion 132 through the support portion 1311. In other words, the end of the connecting arm 13122 away from the sealing portion 132 is subjected to a concentrated load. In this case, a force analysis of the connecting arm 13122 shows that the closer to the connection portion 1312 of the connecting arm 13122 and the sealing portion 132, the greater the bending moment of the connecting arm 13122. By setting the thickness of the inclined section 131223 to be larger at the portion close to the sealing portion 132 and smaller at the portion away from the sealing portion 132, the thickness of the portion of the connecting arm 13122 that is subjected to a larger bending moment is larger, and the thickness of the portion of the connecting arm 13122 that is subjected to a smaller bending moment is smaller, which can not only ensure the bearing capacity of the connecting arm 13122, but also reduce material costs.

[0141] Experience has shown that thinner parts of an object are more susceptible to deformation than thicker parts. In the above technical solution, the portion of the inclined section 131223 near the support portion 1311 is relatively easy to deform, providing a good vibration dampening effect. Meanwhile, the portion of the inclined section 131223 near the sealing portion 132 is relatively resistant to deformation, making the sealing portion 132 adjacent to the inclined section 131223 less susceptible to disturbance. Therefore, by gradually decreasing the thickness of the inclined section 131223 from the sealing portion 132 to the straight section 131222, the insulating member 13 can achieve both good dampening and good sealing effects.

[0142] According to some embodiments of the present application, optionally, as Figure 9 As shown, a reinforcing rib 1313 is formed on the outer circumferential surface of the support portion 1311 . The reinforcing rib 1313 extends along the circumference of the support portion 1311 , and two ends of the reinforcing rib 1313 are respectively connected to two adjacent connecting arms 13122 .

[0143] like Figure 9 As shown, the connecting arm 13122 is connected to the outer peripheral surface of the support portion 1311. Due to the action of the connecting arm 13122, the structural strength of the portion of the support portion 1311 connected to the connecting arm 13122 is relatively high, while the structural strength of the portion of the support portion 1311 not connected to the connecting arm 13122 (that is, the portion between two adjacent connecting arms 13122) is relatively low, which makes the support portion 1311 prone to uneven deformation.

[0144] The reinforcing ribs 1313 are used to connect to the surface of the component to increase the rigidity and structural strength of the component. The reinforcing ribs 1313 can be integrally formed with the support portion 1311 or independently formed and connected to the support portion 1311.

[0145] In the technical solution, the reinforcing rib 1313 is connected to the part of the support part 1311 where no connecting arm 13122 is arranged, thereby increasing the structural strength of the part of the support part 1311 where no connecting arm 13122 is arranged, and relieving the problem of uneven deformation of the support part 1311. In addition, the reinforcing rib 1313 extends along the circumferential direction of the support part 1311, and the two ends of the reinforcing rib 1313 are connected to two adjacent connecting arms 13122 respectively, and the force received by the part of the support part 1311 where no connecting arm 13122 is arranged can be transmitted to the connecting arm 13122, so that the entire outer periphery of the support part 1311 is supported by the connecting arm 13122, and the problem of uneven deformation of the support part 1311 is further relieved.

[0146] By relieving the problem of uneven deformation of the support part 1311, the stability of the support part 1311 is improved, and the support part 1311 can stably support the electrode assembly 12.

[0147] According to some embodiments of the present application, as shown in Figure 6 and Figure 10 The end of the shell 111 provided with the opening is inwardly folded to form a folded part 11111, and an inner wall of the shell 111 is formed with an annular protrusion 11112 extending along the circumferential direction of the shell 111; the end cover 112 includes an end cover body 1121 and an edge part 1122 formed around the end cover body 1121, the edge part 1122 is located between the folded part 11111 and the annular protrusion 11112, and the sealing part 132 is configured to be wrapped around the edge part 1122.

[0148] The end of the shell 111 provided with the opening refers to the end of the side wall 1111 away from the bottom wall 1112, in other words, the end of the side wall 1111 matched with the end cover 112.

[0149] The folded part 11111 refers to the edge of the side wall 1111 being folded in a direction close to the central axis of the battery monomer 1, and the part formed perpendicular to the central axis direction of the battery monomer 1. In the present application, the central axis direction of the battery monomer 1 is the height direction H of the battery monomer. The folded part 11111 can be partially perpendicular or entirely perpendicular to the central axis direction of the battery monomer 1. In the present application, "perpendicular" does not mean that the component must be absolutely perpendicular, but can be slightly inclined, for example, the folded part 11111 can form an angle with the height direction H of the battery monomer.

[0150] The annular protrusion 11112 refers to a protruding structure formed on the side wall 1111 along the circumferential direction of the shell 111. Optionally, the shell 111 is roll grooved from the outside of the shell 111 to form the annular protrusion 11112 towards the inside of the shell 111 at the part corresponding to the roll groove of the shell 111.

[0151] The folded portion 11111 and the annular protrusion 11112 are arranged to clamp the edge portion 1122, and the sealing portion 132 covers the edge portion 1122, so that the folded portion 11111 and the annular protrusion 11112 press the sealing portion 132, respectively, to achieve insulation and sealing of the end cover 112 and the shell 111, and to improve the processing speed and production efficiency.

[0152] According to some embodiments of the present application, as shown in Figure 6 The sealing portion 132 includes a first portion, a second portion 1322, and a third portion 1323. The first portion 1321 is arranged between the annular protrusion 11112 and the edge portion 1122. The second portion 1322 is arranged between the inner wall of the shell 111 and the outer circumferential surface of the edge portion 1122. The third portion 1323 is arranged between the folded portion 11111 and the edge portion 1122. The second portion 1322 connects the first portion 1321 and the third portion 1323. The body portion 131 is connected to the first portion 1321.

[0153] The sealing portion 132 is sequentially connected and formed by the first portion 1321, the second portion 1322, and the third portion 1323, so that the edge portion 1122 is completely covered, and the insulation effect is good. On the other hand, the three portions of the sealing portion 132 are clamped and fixed respectively, the insulation piece 13 is stably installed and is not easy to shift, so as to avoid losing the sealing effect and the effect of buffering vibration, and further prolong the service life of the battery monomer 1.

[0154] According to some embodiments of the present application, as shown in Figure 6 and Figure 10 The end cover body 1121 includes a planar portion and a transition portion 11212. The transition portion 11212 is formed around the planar portion 11211. The transition portion 11212 extends from the planar portion 11211 in the radial direction of the shell 111 and towards the direction close to the electrode assembly 12. The transition portion 11212 connects the planar portion 11211 and the edge portion 1122.

[0155] In the height direction H of the battery monomer, the projection of the electrode assembly 12 on the end cover 112 mainly falls on the planar portion 11211. By arranging the transition portion 11212, the transition portion 11212 guides the planar portion 11211 to move away from the electrode assembly 12 relative to the edge portion 1122, and increases the distance between the planar portion 11211 and the electrode assembly 12, so as to avoid the electrode assembly 12 from vibrating and impacting the end cover 112, and further relieve the rigid collision between the electrode assembly 12 and the end cover 112. Moreover, the planar portion 11211 moving away from the electrode assembly 12 also plays a role in increasing the internal space of the battery monomer 1, which is conducive to improving the energy density of the battery monomer 1.

[0156] According to some embodiments of the present application, as shown in Figure 6As shown, along the direction away from the electrode assembly, the outer surface of the planar portion 11211 does not exceed the outer surface of the folded portion 11111.

[0157] The direction away from the electrode assembly 12 is the direction away from the motor assembly along the height direction H of the battery cell.

[0158] The outer surface of the planar portion 11211 does not extend beyond the outer surface of the folded portion 11111, resulting in a flat end surface of the housing 11 free of protrusions 131221. The planar portion 11211 does not occupy the external space of the battery cell 1, does not increase the overall volume of the battery cell 1, and does not reduce the energy density of the battery cell 1, thereby ensuring a high energy density of the battery cell 1. Furthermore, when multiple battery cells 1 are combined to form the battery 100, the gaps between adjacent battery cells 1 along the height direction H of the battery cells are small, and the gaps between the battery cells 1 and the plane on which they are placed are also small, reducing space waste and improving the energy density of the battery 100.

[0159] The flat portion 11211 does not extend beyond the folded portion 11111 , which can prevent the flat portion 11211 from interfering with the external structure of the battery cell 1 and causing damage, thereby protecting the end cover 112 and extending the service life of the battery cell 1 .

[0160] According to some embodiments of the present application, optionally, in combination with Figure 4 and Figure 11 As shown, a first electrode tab 122 is formed at one end of the electrode assembly 12 facing the end cover 112, and the battery cell 1 also includes: a first current collecting member 15 for electrically connecting the first electrode tab 122 and the shell 111, and the first current collecting member 15 is arranged between the electrode assembly 12 and the insulating member 13, and the insulating member 13 abuts against the first current collecting member 15 to elastically support the electrode assembly 12.

[0161] The electrode assembly 12 includes a first electrode plate, a second electrode plate and a separator, and the separator is used to separate the first electrode plate and the second electrode plate. The polarities of the first electrode plate and the second electrode plate are opposite. In other words, one of the first electrode plate and the second electrode plate is a positive electrode plate, and the other of the first electrode plate and the second electrode plate is a negative electrode plate. The first electrode plate, the second electrode plate and the separator are prior art. Although not shown in the drawings of the present application specification, those skilled in the art should understand their specific structures. From the appearance of the electrode assembly 12, the electrode assembly 12 includes a main body 121, a first electrode tab 122 and a second electrode tab 123, and the first electrode tab 122 and the second electrode tab 123 protrude from the main body 121. The first electrode tab 122 is the portion of the first electrode plate that is not coated with the active material layer, and the second electrode tab 123 is the portion of the second electrode plate that is not coated with the active material layer. The first electrode tab 122 and the second electrode tab 123 can extend from the same side of the main body 121, or can extend from opposite sides respectively. For example, as Figure 4As shown, the first electrode tab 122 and the second electrode tab 123 are respectively disposed at two ends of the main body 121 , that is, the first electrode tab 122 and the second electrode tab 123 are respectively located at two ends of the electrode assembly 12 .

[0162] The first current collecting member 15 is a component used to electrically connect the first electrode tab 122 and the electrode lead-out portion of the housing 11 to transmit electrical energy from the electrode assembly 12 to the electrode lead-out portion. The electrical energy is transmitted to the outside of the battery cell 1 through the electrode lead-out portion. Multiple battery cells 1 are electrically connected through the current collecting member to achieve series, parallel or mixed connection of multiple battery cells 1. Optionally, as Figure 6 As shown, one side of first current collecting member 15 is electrically connected to first tab 122 of electrode assembly 12, and the other side of first current collecting member 15 is electrically connected to annular protrusion 11112, thereby electrically charging housing 111, which serves as an electrical lead. The electrical connection can be achieved by contact conduction, bonding with conductive adhesive, or welding.

[0163] like Figure 6 As shown, the insulating member 13 indirectly supports the electrode assembly 12 through the first current collecting member 15. When the electrode assembly 12 vibrates, the insulating member 13 can not only buffer the amplitude of the electrode assembly 12, but also enable the first current collecting member 15 and the electrode assembly 12 to maintain a relatively consistent amplitude, thereby reducing the tension between the first current collecting member 15 and the electrode assembly 12 to prevent the first electrode tab 122 from tearing, and to prevent the connection portion 1312 of the first current collecting member 15 and the electrode assembly 12 from being torn, thereby improving the connection reliability between the first current collecting member 15 and the electrode assembly 12, thereby improving the service life of the battery cell 1.

[0164] According to some embodiments of the present application, optionally, in combination with Figure 4 and Figure 11 As shown, a second tab 123 is formed at one end of the electrode assembly 12 away from the end cover 112 , and the battery cell 1 further includes: an electrode terminal 16 insulated and mounted on the housing 111 ; and a second current collecting member 17 for electrically connecting the second tab 123 and the electrode terminal 16 .

[0165] Second current collecting member 17 is used to electrically connect second electrode tab 123 to the other electrode lead portion of housing 11, thereby transmitting electrical energy from electrode assembly 12 to the other electrode lead portion. Electrical energy is then transmitted to the exterior of battery cell 1 through the electrode lead portion. Multiple battery cells 1 are electrically connected via the current collecting member, enabling them to be connected in series, in parallel, or in a hybrid configuration.

[0166] Alternatively, as Figure 4As shown, one side of the second current collecting member 17 presses against and electrically connects to the second tab 123 of the electrode assembly 12, while the other side of the second current collecting member 17 is electrically connected to the electrode terminal 16, which serves as an electrical lead. The electrical connection can be made by contact, bonding with a conductive adhesive, or welding.

[0167] In the above scheme, under the buffering effect of the insulating member 13, the vibration amplitude of the electrode assembly 12 is reduced, thereby reducing the tension between the first current collecting member 15 and the electrode assembly 12, the second pole ear 123 is not easy to tear, the connection part 1312 between the second pole ear 123 and the second current collecting member 17 is not easy to be torn, and the connection part 1312 between the second current collecting member 17 and the electrode terminal 16 is not easy to be torn, thereby improving the electrical connection reliability between the electrode assembly 12 and the electrode terminal 16, ensuring stable overcurrent, and improving the service life of the battery cell 1.

[0168] Optionally, the bottom wall 1112 of the shell 111 and the electrode terminal 16 serve as electrode lead-out portions respectively, so that when assembling the battery 100, the busbar component can be connected at the same end of the battery cell 1, simplifying the structure of the battery 100. It is also convenient to set a pressure relief mechanism 14 at the end of the battery cell 1 away from the busbar component to release the internal pressure, so as to avoid damage to the busbar component when the pressure relief mechanism 14 is actuated.

[0169] In a second aspect, an embodiment of the present application provides a battery 100, such as Figure 2 As shown, the battery 100 includes the aforementioned battery cell 1 .

[0170] In a third aspect, the present application provides an electrical device, such as Figure 1 As shown, the electrical device is a vehicle 1000 , which is provided with the aforementioned battery 100 , and the battery 100 is used to provide electrical energy to a motor 200 of the vehicle 1000 , as well as to provide electrical energy to other functional components such as a controller 300 .

[0171] Fourthly, Figure 12 As shown, an embodiment of the present application provides a method for manufacturing a battery cell 1, the manufacturing method comprising:

[0172] S100, providing a housing 11, wherein the housing 11 includes a wall portion 11a;

[0173] S200, providing an electrode assembly 12;

[0174] S300, providing an insulating member 13;

[0175] S400, place the electrode assembly 12 and the insulating member 13 into the outer shell 11, so that the insulating member 13 is located between the electrode assembly 12 and the wall portion 11a and elastically supports the electrode assembly 12 to insulate and separate the wall portion 11a and the electrode assembly 12, and buffer the vibration of the electrode assembly 12 in the outer shell 11.

[0176] It should be noted that the relevant structure of the battery cell 1 manufactured by the above-mentioned method for manufacturing the battery cell 1 can refer to the battery cell 1 provided in the above-mentioned embodiments.

[0177] When assembling a battery cell 1 based on the above-described method for manufacturing the battery cell 1, the above-described steps do not necessarily need to be performed sequentially. In other words, the steps may be performed in the order mentioned in the embodiment, or in a different order than that mentioned in the embodiment, or several steps may be performed simultaneously. For example, steps S100 and S200 may be performed in any order and may be performed simultaneously.

[0178] In a fifth aspect, the present invention provides a manufacturing device 400 for a battery cell 1, such as Figure 13 As shown, the manufacturing equipment 400 includes:

[0179] A first providing device 401 is used to provide a housing 11, wherein the housing 11 includes a wall portion 11a;

[0180] A second providing device 402 is used to provide an electrode assembly 12;

[0181] A third providing device 403 is used to provide an insulating member 13;

[0182] The assembly device 404 is used to place the electrode assembly 12 and the insulating member 13 into the outer shell 11 so that the insulating member 13 is located between the electrode assembly 12 and the wall portion 11a and elastically supports the electrode assembly 12 to insulate and separate the wall portion 11a and the electrode assembly 12, and to buffer the vibration of the electrode assembly 12 in the outer shell 11.

[0183] The relevant structure of the battery cell 1 manufactured by the above manufacturing system can refer to the battery cell 1 provided in the above embodiments.

[0184] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0185] According to one embodiment of the present application, see Figures 2-11The embodiment of the present application provides a cylindrical battery monomer 1, which comprises a shell 11, an electrode assembly 12 and an insulating piece 13. The shell 11 comprises a shell body 111 and an end cover 112, the shell body 111 comprises a bottom wall 1112 and a side wall 1111 surrounding the bottom wall 1112, an end of the side wall 1111 away from the bottom wall 1112 forms an opening, and the end cover 112 covers the opening to isolate the inside of the shell 11 and the outside space. The electrode terminal 16 is arranged on the bottom wall 1112 in an insulating mode. The side wall 1111 is provided with an annular protrusion 11112, and the edge of the side wall 1111 is folded towards the inside of the shell body 111 to form a folded part 11111. Specifically, the end cover 112 comprises an end cover body 1121 and an edge part 1122, the edge part 1122 is formed around the end cover body 1121, and the edge part 1122 is clamped between the annular protrusion 11112 and the folded part 11111, so that the shell body 111 and the end cover 112 are mechanically connected. The electrode assembly 12 has a first tab 122 at one end close to the end cover 112, and has a second tab 123 at one end close to the electrode terminal 16. The battery monomer 1 further comprises a first current collecting member 15 and a second current collecting member 17, the first current collecting member 15 connects the first tab 122 and the annular protrusion 11112, and the second current collecting member 17 connects the second tab 123 and the electrode terminal 16, so that the electrode terminal 16 and the bottom wall 1112 respectively carry different charges, so as to lead out electric energy from the same end of the battery monomer 1. The insulating piece 13 comprises a sealing part 132 and a body part 131. The sealing part 132 covers the edge part 1122 to insulate and seal the end cover 112 and the shell body 111. The body part 131 comprises a supporting part 1311 and a connecting part 1312. The supporting part 1311 is an annular structure 13111 and is used for supporting the electrode assembly 12. The connecting part 1312 comprises a plurality of connecting arms 13122, the plurality of connecting arms 13122 are distributed at intervals around the supporting part 1311 and are respectively connected to the supporting part 1311 and the sealing part 132, and the plurality of connecting arms 13122 are elastically deformed to buffer the vibration of the electrode assembly 12.

[0186] The above only describes the preferred embodiments of the present application and is not used to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: An outer shell, comprising a wall portion, the outer shell comprising a shell and an end cover, the shell having an opening, the end cover covering the opening, the wall portion being the end cover, and the outer shell being a cylindrical shell; a pressure relief mechanism, the pressure relief mechanism being provided on the end cover and being configured to be actuated to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; an electrode assembly, disposed in the housing; an insulating member, disposed between the electrode assembly and the wall portion to insulate and isolate the wall portion from the electrode assembly; wherein the insulating member is configured to elastically support the electrode assembly to buffer vibration of the electrode assembly within the housing; The insulating member comprises: a body portion, disposed between the end cap and the electrode assembly to support the electrode assembly, the body portion being configured to elastically deform when the electrode assembly vibrates; a sealing portion formed around the main body, the sealing portion being disposed between the end cover and the housing so as to seal and insulate the end cover and the housing from each other; The body portion includes a supporting portion and a connecting portion, the supporting portion being used to support the electrode assembly, a projection of the supporting portion on the end cap overlapping with the pressure relief mechanism, the connecting portion being formed around the supporting portion and being used to connect the supporting portion and the sealing portion, and the connecting portion being configured to generate elastic deformation when the electrode assembly vibrates; The connecting portion includes a plurality of connecting arms, which are spaced apart and distributed around the supporting portion. One end of each connecting arm is connected to the outer peripheral surface of the supporting portion, and the other end is connected to the sealing portion.

2. The battery cell according to claim 1, wherein: A gap is defined between the main body and the end cover to allow the main body to deform toward the end cover.

3. The battery cell according to claim 1, wherein: The battery cell also includes a pressure relief mechanism, which is provided on the end cover and is configured to be actuated to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value. A channel is provided on the main body, which is used to connect the interior of the battery cell and the pressure relief mechanism.

4. The battery cell according to claim 1, wherein: The supporting portion protrudes from the connecting portion toward the electrode assembly.

5. The battery cell according to claim 1, characterized in that The supporting portion is an annular structure.

6. The battery cell according to claim 1, characterized in that A protrusion is formed on a side of the connecting portion facing the end cover, and a projection of the protrusion on the wall portion does not overlap with the pressure relief mechanism.

7. The battery cell according to claim 1, characterized in that The connecting arm includes a straight section and an inclined section, wherein the straight section extends from the supporting portion along the radial direction of the shell, and the inclined section extends from the straight section along the radial direction of the shell and in a direction away from the electrode assembly, and the inclined section connects the straight section and the sealing portion.

8. The battery cell according to claim 7, characterized in that Along the direction from the sealing portion to the straight section, the thickness of the inclined section gradually decreases.

9. The battery cell according to any one of claims 1, 7 or 8, characterized in that: A reinforcing rib is formed on the outer peripheral surface of the support portion. The reinforcing rib extends along the circumference of the support portion. Two ends of the reinforcing rib are respectively connected to two adjacent connecting arms.

10. The battery cell according to claim 1, characterized in that One end of the shell provided with the opening is folded inward to form a folded portion, and an annular protrusion is formed on the inner wall of the shell, and the annular protrusion extends along the circumference of the shell; The end cover includes an end cover body and an edge portion, wherein the edge portion is formed around the end cover body and is located between the folded portion and the annular protrusion, and the sealing portion is configured to cover the edge portion.

11. The battery cell according to claim 10, characterized in that The sealing portion includes a first part, a second part and a third part, the first part is arranged between the annular protrusion and the edge portion, the second part is arranged between the inner wall of the shell and the outer peripheral surface of the edge portion, the third part is arranged between the folding portion and the edge portion, the second part connects the first part and the third part, and the main body is connected to the first part.

12. The battery cell according to claim 10 or 11, characterized in that: The end cap body includes a planar portion and a transition portion, wherein the transition portion is formed around the planar portion, extends from the planar portion along the radial direction of the shell and in a direction toward the electrode assembly, and connects the planar portion and the edge portion.

13. The battery cell according to claim 12, characterized in that In a direction away from the electrode assembly, an outer surface of the planar portion does not exceed an outer surface of the folded portion.

14. The battery cell according to any one of claims 1 to 8, characterized in that: The electrode assembly is formed with a first tab at one end facing the end cap, and the battery cell further comprises: The first current collecting member is used to electrically connect the first electrode tab and the housing. The first current collecting member is disposed between the electrode assembly and the insulating member. The insulating member abuts against the first current collecting member to elastically support the electrode assembly.

15. The battery cell according to any one of claims 1 to 8, characterized in that: A second tab is formed at one end of the electrode assembly facing away from the end cap, and the battery cell further comprises: an electrode terminal, insulated and mounted on the housing; The second current collecting member is used to electrically connect the second electrode tab and the electrode terminal.

16. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 15.

17. An electrical device, characterized in that: Including the battery according to claim 16.

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