Battery cell, battery, and electric device

Abstract

A battery cell (10), a battery (100), and an electric device. The battery cell (10) comprises a pole (11) and an electrode assembly (12). A tab (121) is arranged on the side of the electrode assembly (12) close to the pole (11). The tab (121) comprises a first connecting portion (1211). The first connecting portion (1211) extends towards the pole (11). The first connecting portion (1211) is in contact with the pole (11) to achieve electrical connection. An extension direction of a normal line of a contact surface (121a) of the first connecting portion (1211) and the pole (11) is a second direction. An included angle between the second direction and the first direction ranges from 30° to 90°.

Description

A battery cell, a battery, and an electrical device.

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202410866111.4, filed on June 28, 2024, entitled “A Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, specifically to a battery cell, a battery, and an electrical device. Background Technology

[0004] A battery cell includes an electrode assembly and terminals. The tabs of the electrode assembly are electrically connected to the terminals, so that the electrode assembly can realize the charging and discharging functions of the battery cell through the terminals.

[0005] During the process of placing the electrode assembly into the casing of the battery cell, the tabs need to be bent before being electrically connected to the terminals. This bending process carries the risk of cracking and also reduces the tabs' current-carrying capacity.

[0006] Summary of the Invention

[0007] In view of this, the present disclosure aims to provide a battery cell, battery, and power device that facilitates reducing the bending angle of the tabs.

[0008] The technical solution of this disclosure embodiment is implemented as follows:

[0009] This disclosure provides a battery cell, which includes:

[0010] pole;

[0011] An electrode assembly is disposed on one side of the electrode post along a first direction. The electrode assembly has an electrode tab on the side of the electrode post along the first direction. The electrode tab includes a first connecting portion extending toward the electrode post. The first connecting portion contacts the electrode post to achieve an electrical connection. The extension direction of the normal of the contact surface between the first connecting portion and the electrode post is a second direction. The angle between the second direction and the first direction is in the range of 30° to 90°.

[0012] In this embodiment of the battery cell, by limiting the angle between the contact surface of the first connecting part and the terminal post, the bending angle of the first connecting part is reduced, which in turn reduces the probability of problems such as cracking of the electrode tab due to bending, and improves the current overcurrent capacity and safety of the battery cell.

[0013] In some embodiments, the electrode post includes a main body and a second connecting portion. The main body extends along the first direction, and the second connecting portion is located at one end of the main body near the tab and extends perpendicular to the second direction. The first connecting portion and the second connecting portion are fitted together. Thus, by using the second connecting portion to achieve contact with the tab along the second direction, it is beneficial to reduce the size of the main body and consequently the overall size of the electrode post, improving its adaptability.

[0014] In some embodiments, the second direction is perpendicular to the first direction, and the minimum dimension of the main body portion along the second direction is greater than the minimum dimension of the second connecting portion along the second direction. This further reduces the probability of the first connecting portion bending, which is beneficial for reducing the volume of the electrode post, shortening the length of the current conduction path on the second connecting portion, reducing the resistance of the second connecting portion, and improving its current carrying capacity.

[0015] In some embodiments, the maximum dimension of the main body portion along a third direction is smaller than the maximum dimension of the second connecting portion along the third direction, and the second direction, the first direction, and the third direction are perpendicular to each other. This increases the current-carrying area of ​​the second connecting portion, reduces its resistance, and consequently increases the current-carrying capacity of the connection between the tab and the post.

[0016] In some embodiments, the battery cell further includes fasteners. The second connecting portion has at least one first fixing hole at each end along the third direction, and the first connecting portion has at least one second fixing hole at each end along the third direction. The number of fasteners is at least two, with each fastener located on one side of the main body along the third direction. The fasteners pass through the first and second fixing holes to secure the first and second connecting portions. This allows the tab and post to evenly bear the tightening force of the fasteners, reducing the likelihood of misalignment due to uneven force or loosening of the fasteners due to uneven force, thus improving connection stability.

[0017] In some embodiments, the projection of the main body in the projection plane perpendicular to the first direction is circular, which reduces the probability of stress concentration and damage caused by force on the main body and facilitates adaptation to the circular through hole on the battery cell so that the main body can extend beyond the battery cell.

[0018] Alternatively, the projection of the main body is oval, and its length direction is the same as that of the battery cell. This is advantageous because it takes advantage of the ample space along the length of the battery cell to increase the area of ​​the current-carrying cross section of the main body, thereby reducing the resistance of the main body and improving its current-carrying capacity.

[0019] In some embodiments, the battery assembly further includes an electrode portion, with the terminal post and the tab located on the same side of the electrode portion along the first direction. The tab is electrically connected to the electrode portion. The battery cell further includes a support, which is located between the body portion and the electrode portion along the first direction and engages with both along the first direction. This reduces the probability of relative movement between the body portion and the electrode portion, helps maintain their relative position stability, reduces the likelihood of fasteners loosening due to relative movement between the body portion and the electrode portion, and improves the connection stability between the tab and the terminal post.

[0020] In some embodiments, the second connecting portion has a first fixing hole, the first connecting portion has a second fixing hole, the bracket has a third fixing hole, and the battery cell further includes a fastener that passes through the first fixing hole, the second fixing hole, and the third fixing hole to fix the tab, the terminal post, and the bracket. Thus, the bracket, tab, and terminal post can be fixed together using only fasteners, which simplifies the internal structure of the battery cell, reduces the number of parts, and simplifies the manufacturing and assembly processes of the battery cell.

[0021] In some embodiments, the number of supports is at least two, with the two supports spaced apart along the second direction. The second connecting portion and the first connecting portion are located in the gap between the two supports and sandwiched between them along the second direction. Thus, the two supports simultaneously support both sides of the main body along the second direction, ensuring uniform force on the electrode assembly and the electrode post. This reduces the likelihood of misalignment due to uneven force distribution, thereby improving connection stability.

[0022] In some embodiments, the number of brackets is one, and the first connecting portion is sandwiched between the second connecting portion and the bracket along the second direction. This helps reduce the number of components in a single battery cell, simplifies the assembly steps of the brackets, tabs, and terminals, and makes the battery cell structure more compact.

[0023] In some embodiments, the second connecting portion and the bracket are located on opposite sides of the main body along the second direction, and the end face of the second connecting portion facing away from the bracket along the second direction is flush with the end face of the main body along the second direction. This allows the bracket to support the main body along the first direction from one side of the second direction, while the second connecting portion supports the main body along the first direction from the other side of the second direction, thus balancing the forces on the main body. This also allows for increasing the size of the connection point between the second connecting portion and the main body, improving the supporting effect of the second connecting portion on the main body; and avoids the second connecting portion protruding from the main body along the second direction and occupying excessive space within the battery cell.

[0024] In some embodiments, the support includes a first abutting portion, a second abutting portion, and a third connecting portion. The first abutting portion abuts against the electrode portion along the first direction, the second abutting portion abuts against the main body portion along the first direction, and the third connecting portion extends along the first direction. One of the second connecting portion and the first connecting portion is abutted against a first side of the third connecting portion along the second direction. The third connecting portion connects the first abutting portion and the second abutting portion, and both the first abutting portion and the second abutting portion are located on a second side of the third connecting portion along the second direction. This reduces the probability of interference between the first and second abutting portions and the first and second connecting portions, respectively. Simultaneously, it increases the contact area between the support and the main body portion and the electrode portion, respectively, reducing the probability of damage to the main body portion and the electrode portion due to the supporting force of the support.

[0025] In some embodiments, the tab further includes a folding portion connecting the first connecting portion and the electrode portion. The folding portion contracts towards the first connecting portion along the first direction. The first abutting portion includes an abutting sub-portion and a clearance sub-portion. The abutting sub-portion abuts against the electrode portion along the first direction. The clearance sub-portion connects the abutting sub-portion and the third connecting portion. The clearance sub-portion and the electrode portion increase in distance along the first direction towards the third connecting portion. At least a portion of the folding portion is located in the gap between the clearance sub-portion and the electrode portion. This allows the shape of the first abutting portion to adapt to the shape of the folding portion, reducing the probability of interference between the first abutting portion and the folding portion, and reducing the probability of the folding portion bending and being damaged due to compression caused by the first abutting portion.

[0026] In some embodiments, the battery cell includes a housing with a receiving cavity inside. A portion of the electrode assembly is located within the receiving cavity. A portion of the outer surface of the housing protrudes along the first direction to form a protrusion, and within the protrusion, a receiving space communicating with the receiving cavity is formed. At least a portion of the support is located within the receiving space. This allows the portion of the electrode assembly outside the tabs to be closer to the housing, thereby improving the utilization rate of the space within the housing. This facilitates a more compact arrangement of various components within the battery cell and also helps to increase the capacity of the battery cell.

[0027] In some embodiments, the battery cell includes a housing with a receiving cavity inside. A portion of the electrode assembly is located within the receiving cavity. A portion of the outer surface of the housing protrudes along the first direction to form a protrusion, and a receiving space communicating with the receiving cavity is formed within the protrusion. At least a portion of at least one of the fastener, the terminal post, and the tab is located within the receiving space. This allows the portion of the electrode assembly outside the tab to be closer to the housing, thereby improving the utilization rate of the space within the housing. This facilitates a more compact arrangement of various components within the battery cell and also helps to increase the capacity of the battery cell.

[0028] In some embodiments, the terminal post is provided with a first fixing hole, the first connecting portion is provided with a second fixing hole, and the battery cell further includes a fastener, which passes through the first fixing hole and the second fixing hole to fix the first connecting portion and the terminal post. Thus, fixing the tab and terminal post with a fastener eliminates the need for welding between the terminal post and the tab, thereby eliminating the need for adapters within the battery cell in related technologies and simplifying the battery cell structure.

[0029] In some embodiments, both the first fixing hole and the second fixing hole are through holes, and the fastener is a rivet;

[0030] Alternatively, both the first and second fixing holes can be through holes, and the fasteners include screws and nuts. The screw passes through the first and second fixing holes and then engages with the nut through a threaded connection. This riveting and threaded fastening connection is a mature, simple, and low-difficulty process, which helps reduce the dimensional requirements for the tabs and terminals, and consequently lowers the manufacturing cost of the battery cell.

[0031] This disclosure also provides a battery comprising any of the battery cells described in the foregoing embodiments. Thus, using the battery cells described in the foregoing embodiments improves battery safety and current overcurrent capability.

[0032] This disclosure also provides an electrical device including the battery described in the foregoing embodiments, wherein the battery serves as the power source for the electrical device. Thus, using the battery described in the foregoing embodiments improves the safety of the electrical device and its current-carrying capacity. Attached Figure Description

[0033] Figure 1 is a schematic diagram of an embodiment of the present disclosure in which the electrical device is a vehicle;

[0034] Figure 2 is a schematic diagram of a battery in one embodiment of this disclosure;

[0035] Figure 3 is a schematic diagram of a single battery cell in the first embodiment of this disclosure;

[0036] Figure 4 is a cross-sectional view of position AA in Figure 3;

[0037] Figure 5 is a magnified view of a portion of position B in Figure 4;

[0038] Figure 6 is a schematic diagram of the angle between the straight line containing the first direction and the straight line containing the second direction in an embodiment of the present disclosure, wherein c1 is a straight line extending along the first direction and c2 is a straight line extending along the second direction.

[0039] Figure 7 is a schematic diagram of the pole post from a first perspective in the second embodiment of this disclosure;

[0040] Figure 8 is a schematic diagram of the embodiment in Figure 7 from a second perspective;

[0041] Figure 9 is a schematic diagram of the embodiment in Figure 7 from a third-person perspective;

[0042] Figure 10 is a schematic diagram of an electrode assembly in one embodiment of the present disclosure;

[0043] Figure 11 is a magnified view of a portion of position C in Figure 9;

[0044] Figure 12 is a schematic diagram of the pole post in the third embodiment of this disclosure;

[0045] Figure 13 is a schematic diagram of the electrode post, electrode assembly, bracket and fastener of the fourth embodiment of this disclosure;

[0046] Figure 14 is a magnified view of a portion of position D in Figure 13;

[0047] Figure 15 is a partially enlarged schematic diagram of the embodiment in Figure 13 from another perspective;

[0048] Figure 16 is a schematic diagram of the bracket in the fifth embodiment of this disclosure from a fourth perspective;

[0049] Figure 17 is a schematic diagram of the embodiment in Figure 16 from a fifth perspective;

[0050] Figure 18 is a schematic diagram of the embodiment in Figure 16 from a sixth perspective;

[0051] Figure 19 is a schematic diagram of the pole in the sixth embodiment of this disclosure.

[0052] Explanation of reference numerals in the attached drawings: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, battery cell; 11, terminal post; 11a, first fixing hole; 111, main body; 112, second connecting part; 12, electrode assembly; 12a, second fixing hole; 121, electrode tab; 1211, first connecting part; 121a, contact surface; 1212, folding part; 122, electrode plate part; 13, fastener; 14, bracket; 14a, third fixing hole; 141, first abutting part; 1411, abutting sub-part; 1412, clearance sub-part; 142, second abutting part; 143, third connecting part; 15, outer shell; 15a, receiving cavity; 151, protrusion; 151a, receiving space; 20, housing; 21, top cover; 22, bottom cover. Detailed Implementation

[0053] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this disclosure can be combined with each other, and the detailed descriptions in the specific embodiments should be understood as explanations of the purpose of this disclosure and should not be regarded as undue limitations on this disclosure.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0058] In the description of the embodiments of this disclosure, for ease of explanation, as shown in Figures 3 and 4, the direction in which the arrow X is located is referred to as the "second direction".

[0059] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0060] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0061] Currently, batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As the application areas of batteries continue to expand, the market demand for them is also constantly increasing.

[0062] Figure 2 is an exploded perspective view of the battery 100 provided in an embodiment of this disclosure. As shown in Figure 2, the battery 100 includes a housing 20 and at least one battery cell 10.

[0063] The housing 20 includes a top cover 21 and a bottom cover 22. The top cover 21 covers the bottom cover 22, thereby creating an installation space between the bottom cover 22 and the top cover 21 for placing the battery cell 10.

[0064] In battery 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of multiple battery cells 10 is placed in the receiving space formed by the bottom cover 22 and the top cover 21. Alternatively, battery 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed in the receiving space formed by the bottom cover 22 and the top cover 21. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 10.

[0065] The battery cell 10 involved in this embodiment may include an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell 10 can operate by the movement of metal ions between the positive and negative electrode. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector without the positive active material layer protrudes from the current collector coated with the positive active material layer. The current collectors without the positive active material layer are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector without the negative active material layer protrudes from the current collector coated with the negative active material layer. The current collectors without the negative active material layer are stacked together to form the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure.

[0066] The battery cell 10 can be a secondary battery, which means that the battery cell 10 can be used again after being discharged by recharging to activate the active materials.

[0067] The battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., or it can be a solid-state battery. This disclosure does not limit the type of battery cell.

[0068] The battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments disclosed herein.

[0069] In this disclosure, the battery 100 refers to a single physical module comprising one or more battery cells 10 to provide higher voltage and capacity.

[0070] The electrical devices involved in this embodiment are powered by the aforementioned batteries. These devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0071] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this disclosure. The description is as follows, in conjunction with the accompanying drawings.

[0072] Figure 1 is a schematic diagram of the structure of a vehicle 1000 provided in an embodiment of this disclosure. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. As shown in Figure 1, a battery 100 is disposed inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0073] In some embodiments of this disclosure, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0074] The embodiments of this disclosure will now be described in detail.

[0075] In related technologies, the electrode post achieves electrical conductivity with the electrode tab through an adapter plate, so that the electrode plates of the electrode assembly can form a conductive path between the electrode tab and the electrode post.

[0076] During the process of installing the tab into the battery cell housing, in order to facilitate connection with the adapter plate, the tab needs to be bent so that the extension direction of a part of the tab is perpendicular to the relative direction of the tab and the electrode plate, and then the side of this part is welded to the adapter plate.

[0077] Because the tabs are bent, they are prone to cracking due to bending, which reduces their current carrying capacity.

[0078] Based on the above problems, this disclosure provides a battery cell in which the extension direction of the normal of the contact surface between the tab and the terminal post is a second direction, and the angle between the second direction and the first direction is in the range of 30° to 90°, so as to reduce the risk of the tab cracking due to bending.

[0079] Specifically, referring to Figures 3 to 11, this disclosure provides a battery cell 10, which includes a terminal post 11 and an electrode assembly 12.

[0080] The electrode assembly 12 is disposed on one side of the electrode post 11 along the first direction. The electrode assembly 12 is provided with an electrode tab 121 on the side of the electrode post 11 along the first direction. The electrode tab 121 includes a first connecting part 1211. The first connecting part 1211 extends toward the electrode post 11 and contacts the electrode post 11 to achieve electrical connection. The extension direction of the normal of the contact surface 121a between the first connecting part 1211 and the electrode post 11 is a second direction. The angle between the second direction and the first direction is in the range of 30° to 90°.

[0081] The terminal post 11, referring to Figures 4 and 5, can be inserted into the housing 15 of the battery cell 10. A portion of the terminal post 11 can be located inside the housing 15 to be electrically connected to the electrode assembly 12 located inside the housing 15; another portion can be located outside the housing 15 to be electrically connected to other components in the battery 100, such as the busbar and sampling assembly.

[0082] The electrode assembly 12 can undergo an electrochemical reaction with the electrolyte in the battery cell 10 to realize the charging and discharging function of the battery cell 10.

[0083] The tab 121 is used to form a current path between the post 11 and the electrode assembly 12.

[0084] It is understandable that the electrode assembly 12 has a tab 121 on the side near the electrode post 11 to reduce the size of the tab 121 and facilitate electrical connection between the electrode post 11 and the tab 121.

[0085] The first connecting portion 1211 is used to realize the electrical connection between the pole post 11 and the tab 121. It can be understood that the first connecting portion 1211 can be at least a part of the tab 121.

[0086] The first connecting portion 1211 extends toward the electrode post 11. That is, the extension direction of the first connecting portion 1211 is not perpendicular to the relative direction between the electrode post 11 and the tab 121. This helps to reduce the bending angle of the first connecting portion 1211 relative to the part of the electrode assembly 12 other than the tab 121.

[0087] The contact surface 121a refers to the plane on which the first connecting part 1211 makes contact with the pole post 11.

[0088] Referring to Figure 6, c1 is a straight line extending along the first direction, and c2 is any straight line extending along the second direction. It can be understood that the straight line c2 is perpendicular to the contact surface 121a, and α is the angle between the straight lines c1 and c2, i.e., 30°≤α≤90°.

[0089] The first connecting portion 1211 extends toward the pole post 11 in a first direction in order to reduce its size.

[0090] In this embodiment of the battery cell 10, the angle between the contact surface 121a of the first connecting part 1211 and the terminal post 11 is limited, which helps to reduce the bending angle of the first connecting part 1211, thereby reducing the probability of cracking of the electrode tab 121 due to bending, and improving the current overcurrent capacity and safety of the battery cell 10.

[0091] The angle between the extension direction of the first connecting part 1211 and the first direction is not limited to any specific angle value, such as 30°, 40°, 50°, 60°, 70°, 80° and 90°.

[0092] The method for measuring the angle between the extension direction of the first connecting part 1211 and the first direction is not limited. For example, at room temperature, the pole post 11 and the electrode assembly 12 are placed together on the projection screen of the projection measuring instrument along the measurement direction, which is perpendicular to the first direction and the second direction. A first reference line extending along the first direction is marked according to the pole post 11 and the electrode assembly 12, and a second reference line perpendicular to the projection contour of the contact surface 121a is marked according to the projection contour of the contact surface 121a. The angle between the first reference line and the second reference line is measured to obtain the angle between the second direction and the first direction.

[0093] The specific method of fixing the first connecting part 1211 and the pole post is not limited.

[0094] For example, referring to Figures 3 to 11, the terminal post 11 is provided with a first fixing hole 11a, the first connecting part 1211 is provided with a second fixing hole 12a, and the battery cell 10 also includes a fastener 13, which passes through the first fixing hole 11a and the second fixing hole 12a to fix the first connecting part 1211 and the terminal post 11.

[0095] The first fixing hole 11a is opened on at least one side along the second direction to form an opening.

[0096] The second fixing hole 12a is open on at least one side along the second direction to form an opening.

[0097] The specific types of the first fixing hole 11a and the second fixing hole 12a are not limited. They can be through holes or blind holes, as long as the fastener 13 is inserted into both of them at the same time.

[0098] The fastener 13 may be entirely located inside both the first fixing hole 11a and the second fixing hole 12a; or it may be partially located inside both the first fixing hole 11a and the second fixing hole 12a, and partially located outside both.

[0099] It is understandable that using fastener 13 to fix the relative position of pole post 11 and pole tab 121 is beneficial because it eliminates the need for welding between pole post 11 and pole tab 121.

[0100] Thus, the fastener 13 is used to fix the tab 121 and the terminal post 11, which helps to eliminate the adapter in the battery cell 10 in related technologies and simplifies the structure of the battery cell 10.

[0101] The specific method by which the fastener 13 fixes the pole post 11 and the pole lug 121 is not limited. For example, the pole post 11 and the pole lug 121 can be fixed by friction with the inner wall of the first fixing hole 11a and the inner wall of the second fixing hole 12a; or, the two can be fixed by clamping the two after passing through the first connecting part 1211 and the pole post 11; or both of the above methods can be implemented at the same time.

[0102] The fastener 13 is insulating, and the pole post 11 and the tab 121 are electrically connected by direct contact to reduce the adverse effect of the fastener 13 on the overcurrent capacity of the electrical connection between the pole post 11 and the tab 121.

[0103] In some embodiments, referring to Figures 4 and 5, the electrode post 11 is located on one side of the electrode assembly 12 along the first direction, and the first connecting portion 1211 is attached to the electrode post 11 along the second direction so that the first fixing hole 11a communicates with the second fixing hole 12a, and the second direction is perpendicular to the first direction.

[0104] Thus, the first connecting part 1211 and the pole post 11 fit together to achieve electrical connection between the tab 121 and the pole post 11, which helps to reduce the size of the fastener 13.

[0105] In some embodiments, referring to Figures 7, 10 and 11, both the first fixing hole 11a and the second fixing hole 12a extend along the second direction so that the fastener 13 passes through the first fixing hole 11a and the second fixing hole 12a in one go along the second direction. This also helps to reduce the probability that the fastener 13 will come out of the first fixing hole 11a and the second fixing hole 12a when there is a tendency for movement along the first direction between the pole post 11 and the pole tab 121.

[0106] In some embodiments, referring to FIG6, the pole post 11 includes a main body portion 111 and a second connecting portion 112. The main body portion 111 extends along a first direction, and the second connecting portion 112 is disposed at one end of the main body portion 111 near the tab 121 and extends perpendicular to the second direction. The first connecting portion 1211 is attached to the second connecting portion 112.

[0107] The main body 111 is used to make electrical connections with other electronic devices in the battery 100, such as busbars, sampling components, etc.

[0108] The second connecting part 112 is used to realize the electrical connection between the tab 121 and the post 11.

[0109] Thus, by achieving contact with the tab 121 along the second direction through the second connecting part 112, it is beneficial to reduce the size of the main body 111 and thus reduce the size of the entire pole post 11, thereby improving the adaptability of the pole post 11.

[0110] In some embodiments, referring to Figures 7 and 8, the second direction is perpendicular to the first direction, and the minimum dimension of the main body 111 along the second direction is greater than the minimum dimension of the second connecting part 112 along the second direction. That is, the angle between the first direction and the second direction is 90°, the minimum dimension of the main body 111 along the second direction is L1, and the minimum dimension of the second connecting part 112 along the second direction is L2, where L1 > L2.

[0111] This further reduces the probability of the first connection part 1211 bending, which is beneficial to reducing the volume of the pole 11, shortening the length of the current conduction path on the second connection part 112, reducing the resistance of the second connection part 112, and improving its current carrying capacity.

[0112] It is understandable that, in the projection perpendicular to the second direction, the projection of the first fixing hole 11a and the projection of the second fixing hole 12a are both located within the projection range of the mating area of ​​the first connecting part 1211 and the second connecting part 112.

[0113] In some embodiments, referring to Figures 7 and 9, the maximum dimension of the main body 111 along a third direction is smaller than the maximum dimension of the second connecting portion 112 along a third direction, and the second direction, the first direction, and the third direction are perpendicular to each other. The maximum dimension of the main body 111 along a third direction is L3, and the maximum dimension of the second connecting portion 112 along a third direction is L4, where L3 < L4.

[0114] This increases the current-carrying area of ​​the second connection 112, reduces the resistance of the second connection 112, and further increases the current-carrying capacity of the connection between the tab 121 and the post 11.

[0115] In some embodiments, referring to Figures 10 and 11, the first connecting portion 1211 extends along a third direction to facilitate increasing the area of ​​its contact area with the first connecting portion 1211.

[0116] In some embodiments, the second direction can be the width direction of the battery cell 10, the first direction can be the height direction of the battery cell 10, and the third direction can be the length direction of the battery cell 10. This is advantageous because it takes advantage of the ample space in the length direction of the battery cell 10, and further facilitates increasing the dimensions of the second connecting part 112 and the first connecting part 1211 along the third direction, thereby increasing the area of ​​the contact position between the two and improving the current carrying capacity between the electrode post 11 and the tab 121.

[0117] In some embodiments where fasteners 13, first fixing holes 11a, and second fixing holes 12a are provided, the second connecting portion 112 is provided with at least one first fixing hole 11a at each of its three directional ends, the first connecting portion 1211 is provided with at least one second fixing hole 12a at each of its three directional ends, the number of fasteners 13 is at least two, the two fasteners 13 are respectively located on one side of the main body portion 111 along the three directional direction, and the fasteners 13 pass through the first fixing holes 11a and the second fixing holes 12a to fix the first connecting portion 1211 and the second connecting portion 112.

[0118] The positions of the two first fixing holes 11a and the two second fixing holes 12a are adapted to the two fasteners 13, improving the stability of the connection.

[0119] This allows the tab 121 and the terminal post 11 to evenly bear the fastening force of the fastener 13, reducing the probability of problems such as misalignment due to uneven force or loosening due to uneven force on the fastener 13, thus improving the stability of the connection. In some embodiments, referring to Figures 4 and 5, the number of electrode assemblies 12 in the battery cell 10 is at least two, and the fastener 13 passes through a first fixing hole 11a located on each electrode assembly 12 along the second direction to fix the terminal post 11 to the tab 121 of each battery 100 assembly, which helps to reduce the number of parts.

[0120] In some embodiments, referring to Figures 7 to 9, the projection of the main body 111 in a projection plane perpendicular to the first direction is circular.

[0121] This reduces the likelihood of stress concentration and damage to the main body 111, and facilitates its adaptation to the circular through hole on the battery cell 10, so that the main body 111 can extend beyond the battery cell 10.

[0122] In some embodiments, referring to FIG12, the projection of the main body 111 is oval, and its length direction is the same as the length direction of the battery cell 10.

[0123] This allows for the utilization of the ample space along the length of the battery cell 10 to increase the area of ​​the current-carrying cross section of the main body 111, thereby reducing the resistance of the main body 111 and improving its current-carrying capacity.

[0124] The specific shape of the second connecting part 112 is not limited. For example, referring to Figure 7, the second connecting part 112 is a plate-shaped cuboid structure with its thickness direction being the second direction. This is beneficial to increasing the contact area between the second connecting part 112 and the first connecting part 1211, reducing the resistance of the second connecting part 112, and improving the current carrying capacity of the second connecting part 112.

[0125] It is understandable that during the use of the battery cell 10, due to external vibrations and other reasons, the terminal post 11 and the tab 121 may have a relative motion tendency along the first direction.

[0126] In some embodiments, referring to Figures 5, 13 and 14, the battery 100 assembly further includes an electrode portion 122, with the terminal post 11 and the tab 121 both located on the same side of the electrode portion 122 along a first direction, and the tab 121 electrically connected to the electrode portion 122. The battery cell 10 also includes a support 14, which is located between the main body portion 111 and the electrode portion 122 along the first direction and engages with both along the first direction.

[0127] The electrode assembly 12 includes multiple electrodes, which are stacked or wound to form an electrode portion 122. At least one of the electrodes has a sub-electrode tab on one side, and the sub-electrode tabs together form an electrode tab 121.

[0128] The electrode portion 122 is used to undergo an electrochemical reaction with the electrolyte in the battery cell 10.

[0129] The tab 121 is electrically connected to the electrode portion 122 so that the electrode portion 122 is electrically connected to the electrode post 11.

[0130] The support 14 is located between the main body 111 and the electrode portion 122 and acts as a stop for both, thereby suppressing the tendency of the main body 111 and the electrode portion 122 to move closer to each other.

[0131] This reduces the probability of relative movement between the main body 111 and the electrode portion 122, which helps to keep their relative positions stable and reduces the probability of the fastener 13 loosening due to relative movement between the main body 111 and the electrode portion 122, thus improving the connection stability between the electrode tab 121 and the electrode post 11.

[0132] The bracket 14 is made of insulating material to reduce the chance of a short circuit between the pole 11 and the electrode assembly 12 due to the conductivity of the bracket 14.

[0133] Understandably, it is necessary to keep the position of the bracket 14 relative to the tab 121 and the terminal post 11 stable so that the bracket 14 can maintain its stopping and positioning function on the electrode assembly 12 and the terminal post 11 during the use of the battery cell 10.

[0134] It is understandable that fixing at least one of the pole post 11 and the electrode assembly 12 to the bracket 14 helps to better maintain the relative position between the pole post 11 and the electrode assembly 12.

[0135] In some embodiments provided with fastener 13, first fixing hole 11a and second fixing hole 12a, referring to Figures 5 and 18, bracket 14 is provided with third fixing hole 14a, and fastener 13 passes through first fixing hole 11a, second fixing hole 12a and third fixing hole 14a to fix electrode tab 121, electrode post 11 and bracket 14.

[0136] In this way, the bracket 14, the tab 121 and the terminal post 11 can be fixed together by fastener 13, which helps to simplify the structure inside the battery cell 10, reduce the number of parts, and simplify the manufacturing and assembly process of the battery cell 10.

[0137] In some embodiments, the first fixing hole 11a, the second fixing hole 12a, and the third fixing hole 14a all extend along the second direction so that the fastener 13 passes through the first fixing hole 11a, the second fixing hole 12a, and the third fixing hole 14a along the second direction. This helps to reduce the size of the fastener 13 and facilitates the installation of the fastener 13.

[0138] In some embodiments, the first fixing hole 11a, the second fixing hole 12a and the third fixing hole 14a are all through holes so that the fastener 13 can be inserted through the three holes.

[0139] The specific cooperation relationship between the bracket 14, the first connecting part 1211 and the second connecting part 112 is not limited.

[0140] In some embodiments, referring to FIG5, the number of brackets 14 is at least two, the two brackets 14 are spaced apart along the second direction, the second connecting part 112 and the first connecting part 1211 are located in the gap between the two brackets 14 and are sandwiched between the two brackets 14 along the second direction.

[0141] During the assembly of the battery cell 10, the two brackets 14 can constrain and position the second connecting part 112 and the first connecting part 1211 in the second direction, so that the fastener 13 can be inserted into the first fixing hole 11a, the second fixing hole 12a and the third fixing hole 14a in one go.

[0142] Thus, the two supports 14 can simultaneously support both sides of the main body 111 along the second direction, so that the electrode assembly 12 and the pole post 11 are subjected to uniform force, reducing the probability of problems such as misalignment of the two due to uneven force, and improving the stability of the connection.

[0143] In other embodiments, referring to Figures 13 to 15, there is one bracket 14, and the first connecting part 1211 is sandwiched between the second connecting part 112 and the bracket 14 along the second direction.

[0144] In other words, the main body 111 is supported on only one side along the second direction.

[0145] This helps reduce the number of components in the battery cell 10, simplifies the assembly steps of the bracket 14, tab 121 and terminal post 11, and makes the structure of the battery cell 10 more compact.

[0146] In an embodiment where there is one bracket 14, the second connecting portion 112 and the bracket 14 are located on opposite sides of the main body portion 111 along the second direction.

[0147] That is, the second connecting part 112 is located on one side of the central plane of the main body 111 perpendicular to the second direction, while the bracket 14 is located on the other side of the central plane.

[0148] The central plane of the main body 111 perpendicular to the second direction refers to a reference plane perpendicular to the second direction, and the distance of this plane from one end of the main body 111 along the second direction is equal to its distance from the other end.

[0149] In this way, the bracket 14 provides support to the main body 111 from one side of the second direction along the first direction, while the second connecting part 112 provides support to the main body 111 from the other side of the second direction along the first direction, so that the main body 111 is subjected to balanced forces.

[0150] In some embodiments, the first direction is the direction of gravity.

[0151] In some embodiments, referring to FIG19, the end face of the second connecting portion 112 on the side away from the bracket 14 along the second direction is flush with the end face of the main body portion 111 on one side along the second direction.

[0152] This is beneficial for increasing the size of the connection position between the second connecting part 112 and the main body part 111, thereby improving the supporting effect of the second connecting part 112 on the main body part 111; it also avoids the second connecting part 112 protruding out of the main body part 111 along the second direction and occupying too much space inside the battery cell 10.

[0153] The specific structural form of the support 14 is not limited.

[0154] For example, referring to Figures 14, 16, 17 and 18, the bracket 14 includes a first abutting portion 141, a second abutting portion 142 and a third connecting portion 143. The first abutting portion 141 abuts against the electrode portion 122 along a first direction, the second abutting portion 142 abuts against the main body portion 111 along a first direction, and the third connecting portion 143 extends along the first direction. One of the second connecting portion 112 and the first connecting portion 1211 is attached to the first side of the third connecting portion 143 along a second direction. The third connecting portion 143 connects the first abutting portion 141 and the second abutting portion 142. The first abutting portion 141 and the second abutting portion 142 are both located on the second side of the third connecting portion 143 along the second direction.

[0155] The first side and the second side refer to one of the two sides of the third connecting part 143 in the second direction, respectively.

[0156] The first abutting part 141 and the second abutting part 142 are not connected to the tab 121 or the pole post 11 by fastener 13, but only serve to abut and support the main body part 111 and the pole piece part 122 respectively.

[0157] In this way, the probability of interference between the first contact portion 141 and the second contact portion 142 and the first connecting portion 1211 and the second connecting portion 112, respectively, can be reduced. At the same time, it is also beneficial to increase the contact area between the bracket 14 and the main body portion 111 and the electrode portion 122, respectively, and reduce the probability of damage to the main body portion 111 and the electrode portion 122 caused by the supporting force of the bracket 14.

[0158] In some embodiments where a third fixing hole 14a is provided, the third fixing hole 14a is provided in the third connecting portion 143 to reduce the probability of interference between the installation of the fastener 13 and the main body portion 111 and the electrode portion 122.

[0159] In some embodiments, referring to Figures 5 and 14, the tab 121 is composed of multiple sub-tabs with gaps between them. The sub-tabs need to be brought together to form the first connecting portion 1211 to make the structure more compact. The gathered portions of the sub-tabs together form the gathering portion 1212 of the tab 121. That is, the gathering portion 1212 connects the first connecting portion 1211 and the electrode portion 122.

[0160] It is understandable that there are gaps between the various sub-pole ears in the gathering part 1212, which makes the structural strength of the gathering part 1212 low and prone to deformation under external force.

[0161] In some embodiments of the tab 121 including a retractable portion 1212, referring to Figures 5, 11 and 14, the retractable portion 1212 retracts in a first direction toward the first connecting portion 1211. The first abutting portion 141 includes an abutting sub-portion 1411 and a clearance sub-portion 1412. The abutting sub-portion 1411 abuts against the electrode portion 122 in the first direction. The clearance sub-portion 1412 connects the abutting sub-portion 1411 and the third connecting portion 143. In a second direction toward the third connecting portion 143, the distance between the clearance sub-portion 1412 and the electrode portion 122 in the first direction increases. At least a portion of the retractable portion 1212 is located in the gap between the clearance sub-portion 1412 and the electrode portion 122.

[0162] In this way, the shape of the first abutting part 141 can adapt to the shape of the closing part 1212, reducing the probability of interference between the first abutting part 141 and the closing part 1212, and reducing the probability of the first abutting part 141 squeezing the closing part 1212 and causing the closing part 1212 to bend and be damaged.

[0163] In some embodiments, referring to FIG5, the avoidance portion 1412 and the gathering portion 1212 are spaced apart to further reduce the probability that the gathering portion 1212 will be bent and damaged due to the compression of the first abutment portion 141 by the gathering portion 1212.

[0164] In some embodiments, referring to Figures 3 to 5, the battery cell 10 includes a housing 15, a receiving cavity 15a is provided inside the housing 15, a portion of the electrode assembly 12 is located in the receiving cavity 15a, and a portion of the outer surface of the housing 15 protrudes along a first direction to form a protrusion 151 and a receiving space 151a communicating with the receiving cavity 15a is formed in the protrusion 151.

[0165] The housing 15 provides a mounting location and protection for other components within the battery cell 10, such as the electrode assembly 12. It is understood that the electrolyte is also located in the housing 15a to facilitate an electrochemical reaction with the electrode assembly 12.

[0166] By forming protrusions 151, it is beneficial to increase the total volume of the battery cell 10.

[0167] In some embodiments, referring to Figures 3 to 5, at least a portion of at least one of the pole post 11 and the tab 121 is located in the receiving space 151a in order to reduce the space occupied in the receiving cavity 15a and to facilitate the arrangement of the electrode portion 122 in the receiving cavity 15a.

[0168] This allows the portion of the electrode assembly 12 outside the tab 121 to be closer to the housing 15, thereby improving the utilization rate of the space inside the housing 15. This also helps to make the arrangement of various devices in the battery cell 10 more compact and improves the capacity of the battery cell 10.

[0169] In some embodiments that include a receiving space 151a and a support 14, referring to Figures 3 to 5, at least a portion of the support 14 is located in the receiving space 151a.

[0170] This allows the portion of the electrode assembly 12 outside the tab 121 to be closer to the housing 15, thereby improving the utilization rate of the space inside the housing 15. This also helps to make the arrangement of various devices in the battery cell 10 more compact and improves the capacity of the battery cell 10.

[0171] The specific type of fastener 13 is not limited.

[0172] In some embodiments, referring to FIG5, the first fixing hole 11a and the second fixing hole 12a are both through holes, and the fastener 13 is a rivet.

[0173] In other words, after one end of the fastener 13 passes through the first fixing hole 11a and the second fixing hole 12a, the fastener 13 is deformed by riveting, thereby making the tab 121 and the pole post 11 riveted and fixed together by the fastener 13.

[0174] Thus, the riveting process is mature, simple, and has low technical difficulty, which helps to reduce the size requirements of the tabs 121 and the posts 11, and helps to reduce the production and manufacturing costs of the battery cells 10.

[0175] In another embodiment, referring to FIG14, the first fixing hole 11a and the second fixing hole 12a are both through holes, and the fastener 13 includes a screw and a nut. After the screw passes through the first fixing hole 11a and the second fixing hole 12a, it is threadedly fastened to the nut.

[0176] Thus, the threaded fastening connection process is mature, simple, and has low process difficulty, which helps to reduce the size requirements of the tab 121 and the post 11, and helps to reduce the production and manufacturing cost of the battery cell 10.

[0177] A specific embodiment of a battery cell 10 in this disclosure is as follows:

[0178] Referring to Figures 3 to 11 and 16 to 18, the battery cell 10 includes a housing 15, a terminal post 11, an electrode assembly 12, a fastener 13, and a bracket 14. The fastener 13 is a rivet. The terminal post 11 includes a main body 111 and a second connecting part 112. The second connecting part 112 is located at one end of the main body 111 near the tab 121 and extends along a first direction. The second connecting part 112 has a second fixing hole 12a that extends along a second direction. The minimum dimension of the main body 111 along the second direction is greater than the minimum dimension of the second connecting part 112 along the second direction. The maximum dimension of the main body 111 along a third direction is less than the maximum dimension of the second connecting part 112 along the third direction. The second direction, the first direction, and the third direction are perpendicular to each other. The number of fasteners 13 is at least two, and the two fasteners 13 are respectively located on one side of the main body 111 along a third direction, in the projection plane perpendicular to the first direction. The projection of the main body 111 is circular. The electrode assembly 12 includes an electrode tab 121 and an electrode plate 122. The first connecting part 1211 is provided with a first fixing hole 11a. The electrode post 11 and the electrode tab 121 are both located on the same side of the electrode plate 122 along the first direction. The electrode tab 121 and the electrode plate 122 are electrically connected. The electrode tab 121 also includes a folding part 1212, which connects the first connecting part 1211 and the electrode plate 122. The folding part 1212 is oriented along the first direction towards the first connecting part 1211. The support 14 is contracted and includes a first abutting part 141, a second abutting part 142, and a third connecting part 143. The first abutting part 141 includes an abutting sub-part 1411 and a clearance sub-part 1412. The second abutting part 142 abuts against the main body part 111 in a first direction. The third connecting part 143 extends in the first direction. A third fixing hole 14a is provided in the third connecting part 143 and penetrates the support 14. The number of supports 14 is at least two. The two supports 14 are spaced apart in a second direction. The second connecting part 112 and the first connecting part 1211 are located in the gap between the two supports 14 and are sandwiched between the two supports 14 in the second direction.The first fixing hole 11a, the second fixing hole 12a, and the third fixing hole 14a all extend along the second direction. One of the second connecting portion 112 and the first connecting portion 1211 is fitted to the first side of the third connecting portion 143 along the second direction. The third connecting portion 143 connects the first abutting portion 141 and the second abutting portion 142. The first abutting portion 141 and the second abutting portion 142 are both located on the second side of the third connecting portion 143 along the second direction. The abutting sub-portion 1411 abuts against the electrode portion 122 along the first direction. The abutting sub-portion 1412 connects the abutting sub-portion 1411 and the third connecting portion 143, and is close to the first fixing hole 143 along the second direction. The direction of the three connecting parts 143, the distance between the avoidance part 1412 and the electrode part 122 along the first direction increases, at least a portion of the closing part 1212 is located in the gap between the avoidance part 1412 and the electrode part 122, the housing 15 is provided with a receiving cavity 15a, a part of the electrode assembly 12 is located in the receiving cavity 15a, a part of the outer surface of the housing 15 protrudes along the first direction to form a protrusion 151 and a receiving space 151a communicating with the receiving cavity 15a is formed in the protrusion 151, and at least a portion of at least one of the fastener 13, the bracket 14, the electrode post 11 and the electrode ear 121 is located in the receiving space 151a.

[0179] This disclosure also provides a battery 100, which includes the battery cell 10 in the foregoing embodiments.

[0180] Thus, using the battery cell 10 in the aforementioned embodiments is beneficial to improving the safety of the battery 100 and its overcurrent capability.

[0181] This disclosure also provides an electrical device, which includes the battery 100 in the foregoing embodiments, and the battery 100 serves as the power source for the electrical device.

[0182] Thus, using the battery 100 in the aforementioned embodiments helps to improve the safety of the electrical device and its current carrying capacity.

[0183] The various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions.

[0184] The above description is merely a preferred embodiment of this disclosure and is not intended to limit the embodiments therein. Those skilled in the art will recognize various modifications and variations of the embodiments of this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this disclosure should be included within the protection scope of the embodiments of this disclosure.

Claims

1. A battery cell, comprising: a pole; an electrode assembly disposed on one side of the pole along a first direction, the electrode assembly being provided with a tab on a side close to the pole along the first direction, the tab comprising a first connecting portion extending toward the pole, the first connecting portion being in contact with the pole to achieve electrical connection, a normal line of a contact surface of the first connecting portion and the pole extending in a second direction, an included angle between the second direction and the first direction being in a range of 30° to 90°.

2. The battery cell of claim 1, wherein, The pole comprises a main body portion extending along the first direction and a second connecting portion disposed on an end of the main body portion close to the tab and extending perpendicularly to the second direction, the first connecting portion being attached to the second connecting portion.

3. The battery cell of claim 2, wherein, The second direction is perpendicular to the first direction, and a minimum dimension of the main body portion along the second direction is greater than a minimum dimension of the second connecting portion along the second direction.

4. The battery cell of claim 2 or 3, wherein, A maximum dimension of the main body portion along a third direction is less than a maximum dimension of the second connecting portion along the third direction, the second direction, the first direction and the third direction being perpendicular to each other.

5. The battery cell of claim 4, wherein, The battery cell further comprises fasteners, at least one first fixing hole is provided on each end of the second connecting portion along the third direction, at least one second fixing hole is provided on each end of the first connecting portion along the third direction, the number of the fasteners is at least two, the two fasteners are respectively located on one side of the main body portion along the third direction, and the fasteners are arranged through the first fixing holes and the second fixing holes to fix the first connecting portion and the second connecting portion.

6. The battery cell of any one of claims 2 to 5, wherein, In a projection plane perpendicular to the first direction, a projection of the main body portion is circular; alternatively, the projection of the main body portion is kidney-shaped, and a length direction thereof is the same as a length direction of the battery cell.

7. The battery cell of any one of claims 2 to 6, wherein, The battery assembly further comprises a tab portion, the pole and the tab are located on the same side of the tab portion along the first direction, the tab is electrically connected to the tab portion, and the battery cell further comprises a support, the support is located between the main body portion and the tab portion along the first direction and is in abutting engagement with the main body portion and the tab portion along the first direction.

8. The battery cell of claim 7, wherein, The second connecting portion is provided with a first fixing hole, the first connecting portion is provided with a second fixing hole, the support is provided with a third fixing hole, and the battery cell further comprises fasteners arranged through the first fixing hole, the second fixing hole and the third fixing hole to fix the tab, the pole and the support.

9. The battery cell of claim 8, wherein, The number of the supports is at least two, the two supports are spaced apart along the second direction, and the second connecting portion and the first connecting portion are located in a gap between the two supports and are clamped between the two supports along the second direction.

10. The battery cell of claim 8, wherein, The number of the supports is one, and the first connecting portion is clamped between the second connecting portion and the support along the second direction.

11. The battery cell of claim 10, wherein, The second connecting portion and the bracket are located on opposite sides of the main body portion along the second direction, and an end surface of the second connecting portion on a side away from the bracket along the second direction is flush with a side end surface of the main body portion along the second direction.

12. The battery cell of any one of claims 8-11, wherein, The bracket includes a first abutting portion, a second abutting portion, and a third connecting portion, the first abutting portion abuts the pole piece portion along the first direction, the second abutting portion abuts the main body portion along the first direction, the third connecting portion extends along the first direction, one of the second connecting portion and the first connecting portion is attached to a first side of the third connecting portion along the second direction, the third connecting portion connects the first abutting portion and the second abutting portion, and the first abutting portion and the second abutting portion are located on a second side of the third connecting portion along the second direction.

13. The battery cell of claim 12, wherein, The tab further includes a folding portion connecting the first connecting portion and the pole piece portion, the folding portion shrinks in a direction approaching the first connecting portion along the first direction, the first abutting portion includes an abutting sub-portion and an avoiding sub-portion, the abutting sub-portion abuts the pole piece portion along the first direction, the avoiding sub-portion connects the abutting sub-portion and the third connecting portion, and a distance between the avoiding sub-portion and the pole piece portion along the first direction increases in a direction approaching the third connecting portion along the second direction, and at least part of the folding portion is located in a gap between the avoiding sub-portion and the pole piece portion.

14. The battery cell of any one of claims 7-13, wherein, The battery cell includes a housing, the housing is provided with an accommodating cavity, a part of the electrode assembly is located in the accommodating cavity, a part of an outer surface of the housing protrudes to form a protrusion along the first direction, and an accommodating space in communication with the accommodating cavity is formed in the protrusion, and at least part of the bracket is located in the accommodating space.

15. The battery cell of any one of claims 1 to 14, wherein, The battery cell includes a housing, the housing is provided with an accommodating cavity, a part of the electrode assembly is located in the accommodating cavity, a part of an outer surface of the housing protrudes to form a protrusion along the first direction, and an accommodating space in communication with the accommodating cavity is formed in the protrusion, and at least part of the bracket is located in the accommodating space.

16. The battery cell of any one of claims 1 to 15, wherein, The pole post is provided with a first fixing hole, the first connecting portion is provided with a second fixing hole, and the battery cell further includes a fastener, the fastener is arranged through the first fixing hole and the second fixing hole to fix the first connecting portion and the pole post.

17. The battery cell of claim 16, wherein, The first fixing hole and the second fixing hole are both through holes, and the fastener is a rivet. Alternatively, the first fixing hole and the second fixing hole are both through holes, and the fastener includes a screw and a nut, the screw is threadedly fastened with the nut after being arranged through the first fixing hole and the second fixing hole.

18. A battery, the battery including the battery cell of any one of claims 1-17.

19. An electric device, the electric device including the battery of claim 18 as a power supply of the electric device.

Images