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

Battery monomer, battery and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410866111.4, filed on June 28, 2024, entitled "Battery monomer, battery and electric device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the technical field of battery, in particular to a battery monomer, a battery and an electric device. BACKGROUND

[0004] The battery monomer includes an electrode assembly and a pole, and the tab of the electrode assembly is electrically connected with the pole, so that the electrode assembly can realize the charging and discharging function of the battery monomer through the pole.

[0005] In the process of placing the electrode assembly into the shell of the battery monomer, the tab needs to be bent and then electrically connected with the pole. In the process of bending the tab, there is a risk of cracking, and at the same time, the overcurrent capacity of the tab is also reduced.

[0006] SUMMARY

[0007] Therefore, embodiments of the present disclosure aim to provide a battery monomer, a battery and an electric device which facilitate reducing the bending angle of the tab.

[0008] The technical solution of the embodiments of the present disclosure is implemented as follows:

[0009] The embodiments of the present disclosure provide a battery monomer, which comprises:

[0010] a pole;

[0011] an electrode assembly arranged on one side of the pole along a first direction, wherein one side of the electrode assembly close to the pole along the first direction is provided with a tab, the tab comprises a first connecting portion, the first connecting portion extends towards the pole, the first connecting portion is in contact with the pole to realize electrical connection, the extension direction of the normal line of the contact surface of the first connecting portion and the pole is a second direction, and the included angle between the second direction and the first direction ranges from 30° to 90°.

[0012] The battery monomer in the embodiments of the present disclosure limits the angle of the contact surface of the first connecting portion and the pole, thereby facilitating reducing the bending angle of the first connecting portion, and further facilitating reducing the probability of cracking and other problems of the tab caused by bending, and facilitating improving the overcurrent capacity and use safety of the battery monomer.

[0013] In some embodiments, the pole includes a main body part extending along the first direction and a second connecting part arranged at one end of the main body part close to the tab and extending perpendicularly to the second direction, and the first connecting part is attached to the second connecting part. In this way, the second connecting part is used to contact the tab along the second direction, which helps to reduce the size of the main body part and the entire pole, and improve the fitting of the pole.

[0014] In some embodiments, the second direction is perpendicular to the first direction, and the minimum size of the main body part along the second direction is greater than the minimum size of the second connecting part along the second direction. In this way, the probability of bending of the first connecting part is further reduced, which helps to reduce the volume of the pole, shorten the length of the current conduction path on the second connecting part, reduce the resistance of the second connecting part, and improve the current carrying capacity thereof.

[0015] In some embodiments, the maximum size of the main body part along a third direction is less than the maximum size of the second connecting part along the third direction, and the second direction, the first direction and the third direction are perpendicular to each other. In this way, the current carrying area of the current flowing through the second connecting part is increased, the resistance of the second connecting part is reduced, and the current carrying capacity of the connection between the tab and the pole is further improved.

[0016] In some embodiments, the battery cell further includes a fastener, at least one first fixing hole is arranged at each end of the second connecting part along the third direction, at least one second fixing hole is arranged at each end of the first connecting part along the third direction, the number of fasteners is at least two, and the fasteners are arranged on one side of the main body part along the third direction. The fasteners are arranged in the first fixing holes and the second fixing holes to fix the first connecting part and the second connecting part. In this way, the tab and the pole can uniformly bear the fastening force of the fastener, the probability of position deviation of the tab and the pole due to uneven force, and the probability of loosening of the fastener due to uneven force are reduced, and the stability of the connection is improved.

[0017] In some embodiments, in a projection plane perpendicular to the first direction, the projection of the main body part is circular, which reduces the probability of damage of the main body part due to stress concentration under force, and facilitates the fitting with the circular through hole on the battery cell so that the main body part extends out of the battery cell.

[0018] Alternatively, the projection of the main body part is a waist-round shape, and the length direction thereof is the same as the length direction of the battery cell, which is beneficial to take advantage of the feature that the length direction of the battery cell has sufficient space, increase the area of the current overcurrent section of the main body part, and thus reduce the resistance of the main body part and improve the current overcurrent capacity of the main body part.

[0019] In some embodiments, the battery assembly further comprises a tab part, the pole post and the tab are both located on the same side of the tab part along the first direction, the tab is electrically connected with the tab part, and the battery cell further comprises a support, the support is located between the main body part and the tab part along the first direction and is in stop cooperation with both along the first direction. In this way, the probability of relative motion between the main body part and the tab part is reduced, the relative position of the two is kept stable, and the probability of loosening of the fastener due to relative motion between the main body part and the tab part is reduced, thereby improving the connection stability of the tab and the pole post.

[0020] In some embodiments, the second connecting part is provided with a first fixing hole, the first connecting part is provided with a second fixing hole, the support is provided with a third fixing hole, and the battery cell further comprises a fastener, the fastener passes through the first fixing hole, the second fixing hole and the third fixing hole to fix the tab, the pole post and the support. In this way, the fixing of the support, the tab and the pole post can be realized only by the fastener, which is beneficial to simplify the structure in the battery cell, reduce the number of components, and simplify the manufacturing and assembly process of the battery cell.

[0021] In some embodiments, the number of supports is at least two, the two supports are spaced apart along the second direction, and the second connecting part and the first connecting part are located in the gap between the two supports and clamped between the two supports along the second direction. In this way, through the two supports, the two sides of the main body part along the second direction can be supported at the same time, so that the electrode assembly and the pole post are uniformly stressed, the probability of position deviation of the two due to uneven stress is reduced, and the stability of the connection is improved.

[0022] In some embodiments, the number of supports is one, and the first connecting part is clamped between the second connecting part and the support along the second direction. In this way, the number of components in the battery cell is reduced, the assembly steps of the support, the tab and the pole post are simplified, and the structure of the battery cell is more compact.

[0023] In some embodiments, the second connecting portion and the support are located at opposite sides of the main body portion along the second direction respectively, and an end surface of the second connecting portion away from the support along the second direction is flush with a side end surface of the main body portion along the second direction. In this way, the support from one side of the second direction to the main body portion plays a supporting role along the first direction, and the second connecting portion from the other side of the second direction to the main body portion also plays a supporting role along the first direction, so that the main body portion is balanced in force; it is beneficial to increase the size of the connecting position between the second connecting portion and the main body portion, improve the supporting effect of the second connecting portion on the main body portion, and also avoid that the second connecting portion protrudes from the main body portion along the second direction and occupies too much space in the battery monomer.

[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 with the tab portion along the first direction, the second abutting portion abuts with 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 the third connecting portion along a first side of 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. In this way, the probability of interference between the first abutting portion and the second abutting portion and the first connecting portion and the second connecting portion can be reduced, and it is also beneficial to increase the contact area of the support with the main body portion and the tab portion respectively, and reduce the probability of damage to the main body portion and the tab portion caused by the supporting force of the support.

[0025] In some embodiments, the tab further includes a folding portion, the folding portion connects the first connecting portion and the tab portion, the folding portion shrinks in the direction of 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 with the tab portion along the first direction, the avoiding sub-portion connects the abutting sub-portion and the third connecting portion, and the avoiding sub-portion is closer to the third connecting portion along the second direction, the distance between the avoiding sub-portion and the tab portion along the first direction increases, and at least part of the folding portion is located in the gap between the avoiding sub-portion and the tab portion. In this way, the shape of the first abutting portion can adapt to the shape of the folding portion, the probability of interference between the first abutting portion and the folding portion is reduced, and the probability of damage to the folding portion caused by the extrusion of the first abutting portion is reduced.

[0026] In some embodiments, the battery cell includes a shell, the shell has a receiving cavity therein, a portion of the electrode assembly is located in the receiving cavity, a portion of an outer surface of the shell protrudes in the first direction to form a protrusion, and a receiving space in communication with the receiving cavity is formed in the protrusion, and at least a portion of the support is located in the receiving space. In this way, the portion of the electrode assembly other than the tab can be closer to the shell, thereby improving the utilization of the space in the shell, facilitating the arrangement of various devices in the battery cell to be more compact, and improving the capacity of the battery cell.

[0027] In some embodiments, the battery cell includes a shell, the shell has a receiving cavity therein, a portion of the electrode assembly is located in the receiving cavity, a portion of an outer surface of the shell protrudes in the first direction to form a protrusion, and a receiving space in communication with the receiving cavity is formed in the protrusion, and at least a portion of at least one of the fastener, the post, and the tab is located in the receiving space. In this way, the portion of the electrode assembly other than the tab can be closer to the shell, thereby improving the utilization of the space in the shell, facilitating the arrangement of various devices in the battery cell to be more compact, and improving the capacity of the battery cell.

[0028] In some embodiments, the 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 post. In this way, the fastener is used to fix the tab and the post, thereby eliminating the need for welding between the tab and the post, eliminating the adapter in the related art, and simplifying the structure of the battery cell.

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

[0030] Alternatively, the first fixing hole and the second fixing hole are 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. In this way, riveting and thread fastening are used, the process is mature and simple, the process difficulty is low, the size requirement of the tab and the post is reduced, and the production cost of the battery cell is reduced.

[0031] The present disclosure also provides a battery including the battery cell of any one of the foregoing embodiments. In this way, the battery cell of the foregoing embodiments is used, thereby improving the use safety of the battery and the overcurrent capacity of the battery.

[0032] The present disclosure also provides a power-using device comprising the battery in the foregoing embodiments, and the battery serves as a power source of the power-using device. Thus, the battery in the foregoing embodiments is adopted, and the use safety of the power-using device and the overcurrent capacity of the current are improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 is a schematic view of a power-using device being a vehicle in an embodiment of the present disclosure;

[0034] FIG. 2 is a schematic view of a battery in an embodiment of the present disclosure;

[0035] FIG. 3 is a schematic view of a battery monomer in a first embodiment of the present disclosure;

[0036] FIG. 4 is a schematic view of a section along A-A in FIG. 3;

[0037] FIG. 5 is a schematic view of a partial enlargement of a position B in FIG. 4;

[0038] FIG. 6 is a schematic view of an angle between a straight line in a first direction and a straight line in a 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] FIG. 7 is a schematic view of a pole in a first perspective in a second embodiment of the present disclosure;

[0040] FIG. 8 is a schematic view of the embodiment in FIG. 7 in a second perspective;

[0041] FIG. 9 is a schematic view of the embodiment in FIG. 7 in a third perspective;

[0042] FIG. 10 is a schematic view of an electrode assembly in an embodiment of the present disclosure;

[0043] FIG. 11 is a schematic view of a partial enlargement of a position C in FIG. 9;

[0044] FIG. 12 is a schematic view of a pole in a third embodiment of the present disclosure;

[0045] FIG. 13 is a schematic view of a pole, an electrode assembly, a bracket, and a fastener in a fourth embodiment of the present disclosure;

[0046] FIG. 14 is a schematic view of a partial enlargement of a position D in FIG. 13;

[0047] FIG. 15 is a schematic view of a partial enlargement of the embodiment in FIG. 13 in another perspective;

[0048] FIG. 16 is a schematic view of a bracket in a fourth perspective in a fifth embodiment of the present disclosure;

[0049] FIG. 17 is a schematic view of the embodiment in FIG. 16 in a fifth perspective;

[0050] FIG. 18 is a schematic view of the embodiment in FIG. 16 in a sixth perspective;

[0051] FIG. 19 is a schematic view of a pole in a sixth embodiment of the present disclosure.

[0052] Reference Signs 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, battery cell; 11, pole; 11a, first fixing hole; 111, main body portion; 112, second connecting portion; 12, electrode assembly; 12a, second fixing hole; 121, tab; 1211, first connecting portion; 121a, contact surface; 1212, folding portion; 122, pole piece portion; 13, fastener; 14, bracket; 14a, third fixing hole; 141, first abutting portion; 1411, abutting sub-portion; 1412, avoiding sub-portion; 142, second abutting portion; 143, third connecting portion; 15, housing; 15a, accommodating cavity; 151, protrusion; 151a, accommodating space; 20, case; 21, top cover; 22, bottom cover. DETAILED DESCRIPTION

[0053] It should be noted that the embodiments and technical features in the present disclosure and the technical features in the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and illustration of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present 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 describing specific embodiments only and is not intended to be limiting of the disclosure; the terms "include" and "have" and any variations thereof used in the specification and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0055] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0056] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is 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 the present disclosure, the term "and / or" is merely an association relationship of associated objects, and can represent three relationships, for example, A and / or B, which can represent three cases of A existing alone, A and B existing simultaneously, and B existing alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects.

[0058] In the description of the embodiments of the present disclosure, for the convenience of description, as shown in FIG. 3 and FIG. 4, the direction in which the arrow X is located is the "second direction".

[0059] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0060] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0061] At present, batteries are more and more widely used in life and industry. Batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and in many fields such as aerospace. With the continuous expansion of the application field of batteries, the market demand is also increasing.

[0062] FIG. 2 is a perspective exploded view of the battery 100 provided by the embodiments of the present disclosure. As shown in FIG. 2, the battery 100 includes a box body 20 and at least one battery monomer 10,

[0063] The box body 20 includes a top cover 21 and a bottom cover 22, and the top cover 21 is covered above the bottom cover 22, so as to form an installation space for placing the battery monomer 10 between the bottom cover 22 and the top cover 21.

[0064] In the battery 100, the battery cell 10 can be multiple, and the multiple battery cells 10 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be directly connected in series or in parallel or in a mixed manner, and then the whole of the multiple battery cells 10 is placed in the accommodating space formed by the bottom cover 22 and the top cover 21. Of course, the battery 100 can also be that the multiple battery cells 10 are first connected in series or in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the accommodating space formed by the bottom cover 22 and the top cover 21. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 10.

[0065] The battery cell 10 involved in the embodiments of the present disclosure can include an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell 10 can work by relying on the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet 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 current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer, and the current collector without the positive electrode active material layer is laminated to serve as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode sheet 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 current collector without the negative electrode active material layer protrudes from the current collector with the negative electrode active material layer, and the current collector without the negative electrode active material layer is laminated to serve as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure.

[0066] The battery cell 10 can be a secondary battery, which means that the battery cell 10 can continue to be used by activating the active material through charging after discharging.

[0067] The battery cell 10 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., or a solid-state battery. The embodiments of the present disclosure are not limited in this regard.

[0068] The battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like, and the embodiments of the present disclosure are not particularly limited.

[0069] The battery 100 involved in the embodiments of the present disclosure refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity.

[0070] The power consuming device involved in the embodiments of the present disclosure is powered by the above-mentioned battery, and the power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, and the like.

[0071] In the following embodiments, for the convenience of description, the power consuming device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described in conjunction with the drawings.

[0072] FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by an embodiment of the present disclosure. 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, and the like. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, and the battery 100 can be arranged at the bottom, the head, or the tail 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 an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0073] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0074] Next, the embodiments of the present disclosure are described in detail.

[0075] In the related art, the pole post is electrically connected to the tab through the adapter sheet, so that the pole sheet of the electrode assembly can form a conductive path between the pole post and the tab.

[0076] In the process of loading the tab into the shell of the battery monomer, in order to facilitate the connection with the adapter piece, the tab needs to be bent to make the extension direction of a part of the tab perpendicular to the relative direction of the tab and the pole piece, and then the side of the part is welded with the adapter piece.

[0077] Due to the bending of the tab, the tab is prone to cracking due to bending, which reduces the current overcurrent capacity of the tab.

[0078] Based on the above problems, the battery monomer provided by the embodiments of the present disclosure is provided, wherein the extension direction of the normal line of the contact surface of the tab and the pole is the second direction, and the included angle between the second direction and the first direction ranges from 30° to 90°, so as to reduce the risk of cracking of the tab due to bending.

[0079] Specifically, referring to FIGS. 3-11, the battery monomer 10 provided by the embodiments of the present disclosure includes a pole 11 and an electrode assembly 12.

[0080] The electrode assembly 12 is arranged on one side of the pole 11 along the first direction, and the electrode assembly 12 is provided with a tab 121 on the side close to the pole 11 along the first direction. The tab 121 includes a first connecting part 1211, which extends towards the pole 11. The first connecting part 1211 is in contact with the pole 11 to realize electrical connection. The extension direction of the normal line of the contact surface 121a of the first connecting part 1211 and the pole 11 is the second direction, and the included angle between the second direction and the first direction ranges from 30° to 90°.

[0081] The pole 11, as shown in FIGS. 4 and 5, can be arranged in the shell 15 of the battery monomer 10. A part of the pole 11 can be located inside the shell 15 to be electrically connected with the electrode assembly 12 located inside the shell 15, and another part can be located outside the shell 15 to be electrically connected with other components in the battery 100, such as the busbar and the sampling assembly.

[0082] The electrode assembly 12 can be electrochemically reacted with the electrolyte in the battery monomer 10 to realize the charging and discharging function of the battery monomer 10.

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

[0084] It can be understood that the side of the electrode assembly 12 close to the pole 11 is provided with the tab 121 to reduce the size of the tab 121 and facilitate the electrical connection between the pole 11 and the tab 121.

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

[0086] The first connecting portion 1211 extends towards the pole 11, that is, the extending direction of the first connecting portion 1211 is not perpendicular to the relative direction between the pole 11 and the tab 121, thus, the angle of the first connecting portion 1211 bending relative to the part of the electrode assembly 12 outside the tab 121 is reduced.

[0087] The contact surface 121a refers to the plane of the first connecting portion 1211 for contacting the pole 11.

[0088] Referring to FIG. 6, c1 is a straight line extending along the first direction, 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 a is the included angle between the straight line c1 and the straight line c2, that is, 30°≤a≤90°.

[0089] The first connecting portion 1211 extends towards the pole 11 along the first direction, so as to reduce the size thereof.

[0090] The battery cell 10 in the embodiments of the present disclosure limits the angle of the contact surface 121a between the first connecting portion 1211 and the pole 11, thus, the bending angle of the first connecting portion 1211 is reduced, and the probability of cracking of the tab 121 caused by bending is reduced, the current overcurrent capacity and the use safety of the battery cell 10 are improved.

[0091] The specific angle value of the included angle between the extending direction of the first connecting portion 1211 and the first direction is not limited, for example, 30°, 40°, 50°, 60°, 70°, 80° and 90°, etc.

[0092] The method for measuring the specific angle value of the included angle between the extending direction of the first connecting portion 1211 and the first direction is not limited, for example, under the room temperature environment, the pole 11 and the electrode assembly 12 are placed together on the projection screen of the projection measuring instrument along the measuring direction, the measuring direction 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 11 and the electrode assembly 12, a second reference line perpendicular to the projection contour of the contact surface 121a is marked according to the projection contour, and the included angle between the first reference line and the second reference line is measured to obtain the included angle between the second direction and the first direction.

[0093] The specific way of fixing the first connecting portion 1211 and the pole 11 is not limited.

[0094] For example, referring to FIGS. 3 to 11, the pole 11 is provided with a first fixing hole 11a, the first connecting portion 1211 is provided with a second fixing hole 12a, and the battery cell 10 further comprises a fastener 13, the fastener 13 is arranged through the first fixing hole 11a and the second fixing hole 12a to fix the first connecting portion 1211 and the pole 11.

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

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

[0097] The specific type of the first fixing hole 11a and the second fixing hole 12a is not limited, which can be a through hole or a blind hole, as long as the fastener 13 can be located inside both of them.

[0098] The fastener 13 can be located inside both of the first fixing hole 11a and the second fixing hole 12a, or a part of the fastener 13 can be located inside both of the first fixing hole 11a and the second fixing hole 12a, and the other part of the fastener 13 can be located outside both of the first fixing hole 11a and the second fixing hole 12a.

[0099] It can be understood that the relative position of the pole 11 and the tab 121 is fixed by using the fastener 13, which is beneficial to the connection between the pole 11 and the tab 121 without welding.

[0100] In this way, the tab 121 and the pole 11 are fixed by the fastener 13, which is beneficial to cancel the adapter in the battery monomer 10 in the related art and simplify the structure of the battery monomer 10.

[0101] The specific way of fixing the pole 11 and the tab 121 by the fastener 13 is not limited, for example, the pole 11 and the tab 121 can be fixed by the friction force of the inner wall of the first fixing hole 11a and the inner wall of the second fixing hole 12a; for another example, the pole 11 and the tab 121 can be fixed by clamping the first connecting part 1211 and the pole 11 after passing through the first connecting part 1211 and the pole 11; and for another example, the above two ways can be realized at the same time.

[0102] The fastener 13 has insulation, and the pole 11 and the tab 121 are electrically connected by direct contact, so as to reduce the adverse effect of the conduction of the fastener 13 on the overcurrent capacity of the electrical connection between the pole 11 and the tab 121.

[0103] In some embodiments, referring to FIG. 4 and FIG. 5, the pole 11 is located at one side of the electrode assembly 12 along the first direction, the first connecting part 1211 is attached to the pole 11 along the second direction to make the first fixing hole 11a and the second fixing hole 12a communicate, and the second direction is perpendicular to the first direction.

[0104] In this way, the attachment of the first connecting part 1211 and the pole 11 realizes the electrical connection between the tab 121 and the pole 11, which is beneficial to reduce the size of the fastener 13.

[0105] In some embodiments, referring to FIGS. 7, 10 and 11, the first fixing hole 11a and the second fixing hole 12a both extend along the second direction, so that the fastener 13 passes through the first fixing hole 11a and the second fixing hole 12a along the second direction at one time, while facilitating reducing the probability of the fastener 13 being pulled out of the first fixing hole 11a and the second fixing hole 12a in the case that the pole 11 and the tab 121 have a tendency to move along the first direction.

[0106] In some embodiments, referring to FIG. 6, the pole 11 comprises a main body 111 and a second connecting part 112, the main body 111 extends along the first direction, the second connecting part 112 is arranged at one end of the main body 111 close to the tab 121 and extends perpendicularly to the second direction, and the first connecting part 1211 is attached to the second connecting part 112.

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

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

[0109] In this way, the contact between the second connecting part 112 and the tab 121 along the second direction facilitates reducing the size of the main body 111 and the entire pole 11, and improving the fitting property of the pole 11.

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

[0111] In this way, the probability of the first connecting part 1211 being bent is further reduced, which facilitates reducing the volume of the pole 11, shortening the length of the current conduction path on the second connecting part 112, reducing the resistance of the second connecting part 112, and improving the current carrying capacity thereof.

[0112] It can be understood 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 in the projection range of the attachment area of the first connecting part 1211 and the second connecting part 112.

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

[0114] In this way, the overcurrent area of the current flowing through the second connecting portion 112 is increased, the resistance of the second connecting portion 112 is reduced, and the current overcurrent capacity of the connection between the tab 121 and the pole 11 is increased.

[0115] In some embodiments, referring to FIG. 10 and FIG. 11, the first connecting portion 1211 extends along the third direction to increase the area of the bonding region of the first connecting portion 1211.

[0116] In some embodiments, the second direction can be the width direction of the battery monomer 10, the first direction can be the height direction of the battery monomer 10, and the third direction can be the length direction of the battery monomer 10. In this way, the length direction of the battery monomer 10 is fully utilized, and the size of the second connecting portion 112 and the first connecting portion 1211 along the third direction is increased to increase the area of the bonding position and improve the current overcurrent capacity between the pole 11 and the tab 121.

[0117] In some embodiments provided with the fastener 13, the first fixing hole 11a and the second fixing hole 12a, at least one first fixing hole 11a is provided at each end of the second connecting portion 112 along the third direction, at least one second fixing hole 12a is provided at each end of the first connecting portion 1211 along the third direction, 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 the third direction. The fastener 13 is provided in the first fixing hole 11a and the second fixing hole 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 matched with the two fasteners 13 to improve the stability of the connection.

[0119] Therefore, the tab 121 and the pole 11 can uniformly bear the fastening force of the fastener 13, the probability of problems such as position deviation of the tab 121 and the pole 11 due to uneven force, and loosening of the fastener 13 due to uneven force is reduced, and the stability of the connection is improved. In some embodiments, referring to FIGS. 4 and 5, the number of the electrode assemblies 12 in the battery monomer 10 is at least two, and the fastener 13 passes through a first fixing hole 11a on each electrode assembly 12 in the second direction, so as to fix the pole 11 and the tab 121 of each battery 100 assembly, and the number of parts is reduced.

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

[0121] Therefore, the probability of damage of the main body part 111 due to stress concentration under force is reduced, and the main body part 111 is matched with the circular through hole on the battery monomer 10, so as to extend out of the battery monomer 10.

[0122] In some embodiments, referring to FIG. 12, the projection of the main body part 111 is a waist circle, and the length direction of the main body part 111 is the same as the length direction of the battery monomer 10.

[0123] Therefore, the length direction space of the battery monomer 10 is utilized to increase the area of the current overcurrent cross section of the main body part 111, so as to reduce the resistance of the main body part 111 and improve the current overcurrent capacity of the main body part 111.

[0124] The specific shape of the second connecting part 112 is not limited. For example, referring to FIG. 7, the second connecting part 112 is a plate-shaped cuboid structure, and the thickness direction of the second connecting part 112 is the second direction. Therefore, the contact area of the second connecting part 112 and the first connecting part 1211 is increased, the resistance of the second connecting part 112 is reduced, and the overcurrent capacity of the second connecting part 112 is improved.

[0125] It can be understood that, in the use process of the battery monomer 10, the tab 121 and the pole 11 can have a relative movement trend in the first direction due to external vibration and the like.

[0126] In some embodiments, referring to FIGS. 5, 13 and 14, the battery 100 assembly further includes a tab part 122, the pole 11 and the tab 121 are located on the same side of the tab part 122 in the first direction, the tab 121 is electrically connected with the tab part 122, and the battery monomer 10 further includes a bracket 14, the bracket 14 is located between the main body part 111 and the tab part 122 in the first direction and is in abutting engagement with the main body part 111 and the tab part 122 in the first direction.

[0127] The electrode assembly 12 includes a plurality of electrode sheets which are stacked or wound to form an electrode sheet portion 122, at least one side of at least some of the electrode sheets being provided with a sub-tab, the sub-tabs collectively forming a tab 121.

[0128] The electrode sheet portion 122 is configured to electrochemically react with an electrolyte within the battery cell 10.

[0129] The tab 121 is electrically connected to the electrode sheet portion 122 to enable electrical connection between the electrode sheet portion 122 and the electrode post 11.

[0130] The bracket 14 is positioned between the main body portion 111 and the electrode sheet portion 122 and functions to stop the main body portion 111 and the electrode sheet portion 122 from moving towards each other.

[0131] In this way, the likelihood of relative movement between the main body portion 111 and the electrode sheet portion 122 is reduced, which helps to maintain the relative positions of the main body portion 111 and the electrode sheet portion 122 stable, and the likelihood of the fastener 13 coming loose due to relative movement between the main body portion 111 and the electrode sheet portion 122 is reduced, which helps to improve the stability of the connection between the tab 121 and the electrode post 11.

[0132] The bracket 14 is made of an insulating material to reduce the likelihood of short circuiting between the electrode post 11 and the electrode assembly 12 due to the bracket 14 conducting electricity.

[0133] It will be appreciated that the position of the bracket 14 relative to the tab 121 and the electrode post 11 needs to be stable so that the bracket 14 can maintain its function of stopping and positioning the electrode assembly 12 and the electrode post 11 during use of the battery cell 10.

[0134] It will be appreciated that fixing at least one of the electrode post 11 and the electrode assembly 12 to the bracket 14 helps to better maintain the relative positions of the electrode post 11 and the electrode assembly 12.

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

[0136] In this way, the fixing of the bracket 14, the tab 121 and the electrode post 11 can be achieved by the fastener 13 alone, which helps to simplify the structure of the battery cell 10, reduce the number of components, and simplify the manufacturing and assembly processes 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, which is beneficial to reduce the size of the fastener 13 and facilitate 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 is arranged in the three holes.

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

[0140] In some embodiments, referring to FIG. 5, the number of the brackets 14 is at least two, the two brackets 14 are arranged at intervals 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 clamped between the two brackets 14 along the second direction.

[0141] In the process of assembling the battery cell 10, the two brackets 14 can play a role of restraining and positioning the second connecting part 112 and the first connecting part 1211 along 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 at one time.

[0142] In this way, through the two brackets 14, the two sides of the main body part 111 along the second direction can be supported at the same time, so that the electrode assembly 12 and the pole 11 are uniformly stressed, the probability of problems such as position deviation of the two due to uneven stress is reduced, and the stability of the connection is improved.

[0143] In other embodiments, referring to FIGS. 13 to 15, the number of the brackets 14 is one, and the first connecting part 1211 is clamped between the second connecting part 112 and the bracket 14 along the second direction.

[0144] That is, only one side of the main body part 111 along the second direction is subjected to a supporting action.

[0145] In this way, it is beneficial to reduce the number of parts in the battery cell 10, simplify the assembly steps of the bracket 14, the tab 121 and the pole 11, and make the structure of the battery cell 10 more compact.

[0146] In the embodiment in which the number of the brackets 14 is one, the second connecting part 112 and the bracket 14 are located on different sides of the main body part 111 along the second direction, respectively.

[0147] That is, the second connecting portion 112 is located on one side of a central surface of the main body portion 111 perpendicular to the second direction, and the support 14 is located on the other side of the central surface.

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

[0149] In this way, the support 14 supports the main body portion 111 along the first direction from one side of the second direction, and the second connecting portion 112 supports the main body portion 111 along the first direction from the other side of the second direction, so that the main body portion 111 is balanced in force.

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

[0151] In some embodiments, referring to FIG. 19, an end surface of the second connecting portion 112 away from the side of the support 14 along the second direction is flush with an end surface of the main body portion 111 along the second direction.

[0152] In this way, it is beneficial to increase the size of the connecting position between the second connecting portion 112 and the main body portion 111, improve the supporting effect of the second connecting portion 112 on the main body portion 111, and avoid the second connecting portion 112 protruding from the main body portion 111 along the second direction and occupying too much space in the battery monomer 10.

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

[0154] For example, referring to FIGS. 14, 16, 17, and 18, the support 14 includes a first abutting portion 141, a second abutting portion 142, and a third connecting portion 143, the first abutting portion 141 abuts with the tab portion 122 along the first direction, the second abutting portion 142 abuts with the main body portion 111 along the first direction, 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 third connecting portion 143 along a first side of the second direction, the third connecting portion 143 connects the first abutting portion 141 and the second abutting portion 142, and the first abutting portion 141 and the second abutting portion 142 are both located on a second side of the third connecting portion 143 along the second direction.

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

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

[0157] In this way, the probability of interference between the first abutting portion 141 and the second abutting portion 142 and the first connecting portion 1211 and the second connecting portion 112 can be reduced, and the contact area between the support 14 and the main body portion 111 and the pole piece portion 122 can be increased, and the probability of damage to the main body portion 111 and the pole piece portion 122 caused by the support force of the support 14 can be reduced.

[0158] In some embodiments provided with the third fixing hole 14a, the third fixing hole 14a is arranged on the third connecting portion 143, so as to reduce the probability of interference between the mounting of the fastener 13 and the main body portion 111 and the pole piece portion 122.

[0159] In some embodiments, referring to FIGS. 5 and 14, the pole lug 121 is formed by a plurality of sub-pole lugs, and gaps are arranged between the plurality of sub-pole lugs. Each sub-pole lug needs to be gathered before the first connecting portion 1211 is formed, so as to make the structure more compact. The gathered portions of the sub-pole lugs collectively form the gathering portion 1212 of the pole lug 121, that is, the gathering portion 1212 connects the first connecting portion 1211 and the pole piece portion 122.

[0160] It can be understood that gaps exist between the sub-pole lugs in the gathering portion 1212, so that the structural strength of the gathering portion 1212 is low and the gathering portion 1212 is prone to deformation under external force.

[0161] In some embodiments in which the pole lug 121 includes the gathering portion 1212, referring to FIGS. 5, 11 and 14, the gathering portion 1212 is contracted in the first direction towards the first connecting portion 1211. The first abutting portion 141 includes an abutting sub-portion 1411 and an avoiding sub-portion 1412. The abutting sub-portion 1411 abuts against the pole piece portion 122 in the first direction. The avoiding sub-portion 1412 connects the abutting sub-portion 1411 and the third connecting portion 143, and is directed towards the third connecting portion 143 in the second direction. The distance between the avoiding sub-portion 1412 and the pole piece portion 122 in the first direction is increased. At least part of the gathering portion 1212 is located in the gap between the avoiding sub-portion 1412 and the pole piece portion 122.

[0162] In this way, the shape of the first abutting portion 141 can be adapted to the shape of the gathering portion 1212, so as to reduce the probability of interference between the first abutting portion 141 and the gathering portion 1212, and reduce the probability of damage to the gathering portion 1212 caused by the extrusion of the first abutting portion 141.

[0163] In some embodiments, referring to FIG. 5, the avoiding sub-portion 1412 is arranged apart from the gathering portion 1212, so as to further reduce the probability of damage to the gathering portion 1212 caused by the extrusion of the first abutting portion 141.

[0164] In some embodiments, referring to FIGS. 3-5, the battery cell 10 includes a housing 15 having a receiving cavity 15a therein, and a portion of the electrode assembly 12 is located in the receiving cavity 15a. A portion of an outer surface of the housing 15 protrudes in a first direction to form a protrusion 151, and a receiving space 151a is formed in the protrusion 151 and is in communication with the receiving cavity 15a.

[0165] The housing 15 is used to provide a mounting position and protection for other devices in the battery cell 10, such as the electrode assembly 12. It can be understood that an electrolyte is also located in the receiving cavity 15a to generate an electrochemical reaction with the electrode assembly 12.

[0166] By forming the protrusion 151, the total volume of the battery cell 10 is increased.

[0167] In some embodiments, referring to FIGS. 3-5, at least a portion of at least one of the pole 11 and the tab 121 is located in the receiving space 151a to reduce the space occupied in the receiving cavity 15a, and to facilitate the space in the receiving cavity 15a to be mainly used for the arrangement of the tab portion 122.

[0168] In this way, the portion of the electrode assembly 12 that is outside the tab 121 can be closer to the housing 15, thereby improving the utilization of the space in the housing 15, facilitating the arrangement of various devices in the battery cell 10 to be more compact, and facilitating the capacity of the battery cell 10 to be increased.

[0169] In some embodiments in which the receiving space 151a and the bracket 14 are provided, referring to FIGS. 3-5, at least a portion of the bracket 14 is located in the receiving space 151a.

[0170] In this way, the portion of the electrode assembly 12 that is outside the tab 121 can be closer to the housing 15, thereby improving the utilization of the space in the housing 15, facilitating the arrangement of various devices in the battery cell 10 to be more compact, and facilitating the capacity of the battery cell 10 to be increased.

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

[0172] In some embodiments, referring to FIG. 5, the first fixing hole 11a and the second fixing hole 12a are both through holes, and the fastener 13 is a rivet.

[0173] That is, 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, and the tab 121 and the pole 11 are riveted and fixed by the fastener 13.

[0174] Therefore, the riveting process is mature and simple, the process difficulty is low, the size requirements of the tab 121 and the pole 11 are reduced, and the production cost of the battery monomer 10 is reduced.

[0175] In another embodiment, referring to FIG. 14, 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, and the screw is threadedly fastened with the nut after passing through the first fixing hole 11a and the second fixing hole 12a.

[0176] Therefore, the threaded fastening connection process is mature and simple, the process difficulty is low, the size requirements of the tab 121 and the pole 11 are reduced, and the production cost of the battery monomer 10 is reduced.

[0177] In an embodiment of the present disclosure, the specific implementation of one battery monomer 10 is as follows:

[0178] Referring to FIGS. 3-11, 16-18, the battery cell 10 includes a housing 15, a pole 11, an electrode assembly 12, a fastener 13, and a bracket 14. The fastener 13 is a rivet. The pole 11 includes a main body portion 111 and a second connecting portion 112. The second connecting portion 112 is disposed at one end of the main body portion 111 close to the tab 121 and extends in a first direction. The second connecting portion 112 is provided with a second fixing hole 12a extending in a second direction. The smallest dimension of the main body portion 111 in the second direction is greater than the smallest dimension of the second connecting portion 112 in the second direction. The largest dimension of the main body portion 111 in a third direction is less than the largest dimension of the second connecting portion 112 in 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. The two fasteners 13 are respectively located at one side of the main body portion 111 in the third direction. In a projection plane perpendicular to the first direction, the projection of the main body portion 111 is circular. The electrode assembly 12 includes the tab 121 and a tab portion 122. The first connecting portion 1211 is provided with a first fixing hole 11a. The pole 11 and the tab 121 are both located on the same side of the tab portion 122 in the first direction. The tab 121 is electrically connected to the tab portion 122. The tab 121 further includes a folding portion 1212 connecting the first connecting portion 1211 and the tab portion 122. The folding portion 1212 shrinks in the first direction towards the first connecting portion 1211. 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 includes an abutting sub-portion 1411 and an avoiding sub-portion 1412. The second abutting portion 142 abuts the main body portion 111 in the first direction. The third connecting portion 143 extends in the first direction. The third connecting portion 143 is provided with a third fixing hole 14a. The third fixing hole 14a penetrates the bracket 14. The number of brackets 14 is at least two. The two brackets 14 are spaced apart in the second direction. The second connecting portion 112 and the first connecting portion 1211 are located in the gap between the two brackets 14 and are clamped between the two brackets 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 part 112 and the first connecting part 1211 and the third connecting part 143 are attached along the first side of the second direction of the third connecting part 143, the third connecting part 143 connects the first abutting part 141 and the second abutting part 142, the first abutting part 141 and the second abutting part 142 are both located on the second side of the third connecting part 143 along the second direction, the abutting sub-part 1411 abuts with the pole piece part 122 along the first direction, the avoiding sub-part 1412 connects the abutting sub-part 1411 and the third connecting part 143, and the avoiding sub-part 1412 is away from the pole piece part 122 along the first direction, the distance between the avoiding sub-part 1412 and the pole piece part 122 increases, at least part of the gathering part 1212 is located in the gap between the avoiding sub-part 1412 and the pole piece part 122, the shell 15 is provided with a containing cavity 15a, part of the electrode assembly 12 is located in the containing cavity 15a, part of the outer surface of the shell 15 protrudes along the first direction to form a protrusion 151, and a containing space 151a in communication with the containing cavity 15a is formed in the protrusion 151, at least part of at least one of the fastener 13, the bracket 14, the pole 11 and the pole lug 121 is located in the containing space 151a.

[0179] The battery 100 provided by the embodiments of the present disclosure includes the battery cell 10 provided by the foregoing embodiments.

[0180] Therefore, the battery cell 10 provided by the foregoing embodiments is used, and the use safety of the battery 100 and the overcurrent capacity of the current are improved.

[0181] The battery 100 provided by the foregoing embodiments is used, and the use safety of the battery 100 and the overcurrent capacity of the current are improved.

[0182] Therefore, the battery cell 10 provided by the foregoing embodiments is used, and the use safety of the battery 100 and the overcurrent capacity of the current are improved.

[0183] The various embodiments / implementation manners provided by the present disclosure can be combined with each other without contradiction.

[0184] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the embodiments of the present disclosure. Those skilled in the art can make various modifications, changes and improvements to the embodiments of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present disclosure shall be included in the protection scope of the embodiments of the present 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, the folding portion connects the first connecting portion and the pole piece portion, the folding portion shrinks in a direction close to 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 close to 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 shell, the shell 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 shell 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 shell, the shell 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 shell 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 one of the pole and the tab is located in the accommodating space.

16. The battery cell of any one of claims 1 to 15, wherein, The pole 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.

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, the battery serving as a power supply of the electric device.

Images