Battery cell, battery device, and electrical device

Abstract

The present disclosure discloses a battery cell, a battery device, and an electrical device, relating to the technical field of batteries. The battery cell comprises: a housing, an electrode assembly, a pole, and a clamping member. The housing encloses and defines an accommodation cavity. The electrode assembly is installed in the accommodation cavity. The electrode assembly comprises at least two layers of electrode sheets from which a tab extends. A portion of the pole is located in the accommodation cavity at a position corresponding to the tab, and another portion thereof passes through the housing and extends to the exterior of the housing. The clamping member is clamped onto the tab, and a side of the clamping member away from the tab is connected to the pole to electrically connect the tab to the pole. The battery cell provided by the present disclosure is configured to provide voltage and capacity.

Description

Battery monomer, battery device and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202421803984.2, filed on July 29, 2024, entitled "Battery monomer, battery device and electric device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

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

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0005] As an important component in a battery, a pole can provide a clear positive and negative connection point for the battery, so that the battery can be correctly connected with other electrical components. The pole and the electrode assembly inside the battery are usually electrically connected by welding. However, the welding area between the pole and the tab on the electrode assembly is prone to cracking, which can cause insufficient flow area between the tab and the pole, thereby affecting the normal use of the battery. SUMMARY

[0006] The present disclosure provides a battery monomer, a battery device and an electric device, which can improve the connection reliability of the pole and the electrode assembly in the battery monomer.

[0007] A first aspect of the present disclosure provides a battery monomer, which comprises: a housing, an electrode assembly, a pole and a clamping piece. The housing encloses a receiving cavity. The electrode assembly is installed in the receiving cavity and comprises at least two layers of pole pieces. The pole pieces extend to form tabs. A part of the pole is located in the receiving cavity at a position corresponding to the tabs, and another part of the pole extends through the housing to the outside of the housing. The clamping piece is clamped on the tabs. The side of the clamping piece away from the tabs is connected with the pole to electrically connect the tabs with the pole.

[0008] The battery cell provided by the present disclosure can provide protection and stable accommodation environment for the electrode assembly through the shell since the electrode assembly is installed in the shell. The pole post is arranged on the shell, and the pole post is connected with the tab to extend the electrode assembly outside the shell, so as to facilitate the electrical connection between the electrode assembly and the electrical device or external conductor through the pole post. Meanwhile, the clamping member is arranged on the tab, and the tab with the multi-layer structure is clamped and fixed through the clamping member, which is conducive to improving the structural strength of the tab. The clamping member is also electrically connected with the pole post to electrically connect the tab and the pole post through the clamping member. Compared with the related art in which the tab is directly electrically connected with the pole post and the tab has a multi-layer structure, the connection structure between the multi-layer tab and the pole post is prone to cracking, which reduces the flow area between the tab and the pole post. The battery cell provided by the present disclosure can electrically connect the tab and the pole post through the clamping member, which can increase the strength of the tab through the clamping member to reduce the risk of cracking of the connection structure between the tab and the pole post. Even if cracking occurs inside the tab, the clamping member is clamped outside the tab and connected with the pole post, so that the tab and the pole post have sufficient flow area. Therefore, the battery cell provided by the present disclosure can improve the reliability of the connection between the pole post and the electrode assembly.

[0009] In a possible implementation of the present disclosure, the clamping member includes a first clamping part and a second clamping part connected and satisfying a parallel relationship, a clamping cavity is formed between the first clamping part and the second clamping part, the tab is fixed in the clamping cavity, and one of the first clamping part and the second clamping part is connected with the pole post.

[0010] In the technical solution of the present disclosure, the clamping member includes a first clamping part and a second clamping part connected and satisfying a parallel relationship, the tab can be clamped through the first clamping part and the second clamping part to facilitate the connection between the clamping member and the tab, and the connection area between the clamping member and the tab can be increased. Meanwhile, one of the first clamping part and the second clamping part is connected with the pole post, so that the tab and the pole post are connected through the clamping member, which is conducive to reducing the cracking of the tab and the pole post directly connected.

[0011] In a possible implementation of the present disclosure, a first folded edge is formed on the first clamping part away from the second clamping part, and the first folded edge is attached to the side of the first clamping part away from the clamping cavity; and / or, a second folded edge is formed on the second clamping part away from the first clamping part, and the second folded edge is attached to the side of the second clamping part away from the clamping cavity.

[0012] In the technical solution of the present disclosure, the first clamping part and the second clamping part are formed with relatively smooth surfaces at the ends thereof due to the formation of the first folded edge on the first clamping part and the second folded edge on the second clamping part. Thus, after the clamping piece is connected with the tab, the sharp corners and thin edges on the clamping piece can be prevented from cutting the tab and causing the tab to break.

[0013] In a possible implementation manner of the present disclosure, the tab and the clamping piece are fixedly connected by ultrasonic welding, and an ultrasonic welding area is formed between the tab and the clamping piece; the clamping piece and the pole are fixedly connected by laser welding, and a laser welding area is formed between the clamping piece and the pole.

[0014] In the technical solution of the present disclosure, the tab and the clamping piece are welded by ultrasonic welding, which can not only form a stable and reliable laser welding area between the clamping piece and the tab, but also form a welding between the layers of the tab with a multi-layer lamination structure, so that the clamping piece and the tab form an integral structure. Meanwhile, the clamping piece and the pole are welded by laser welding, which can form a reliable electrical connection between the clamping piece and the pole, thereby improving the reliability of the connection between the tab and the pole and reducing the problem of cracking in part of the tab and reducing the flow area of the tab and the pole.

[0015] In a possible implementation manner of the present disclosure, the laser welding area is located within the ultrasonic welding area in the orthographic projection.

[0016] In the technical solution of the present disclosure, since the laser welding area is located within the ultrasonic welding area in the orthographic projection, the influence of the heat generated on the clamping piece during laser welding on the ultrasonic welding area can be reduced, and a stable welding structure between the clamping piece and the tab can be maintained.

[0017] In a possible implementation manner of the present disclosure, the area of the ultrasonic welding area is greater than or equal to 1.2 times the area of the laser welding area.

[0018] In the technical solution of the present disclosure, since the area of the ultrasonic welding area is greater than or equal to 1.2 times the area of the laser welding area, the edge part of the ultrasonic welding area that does not coincide with the laser welding area has sufficient area, so that the ultrasonic welding area between the clamping piece and the tab has a larger area and is not affected by the heat generated on the clamping piece during laser welding.

[0019] In a possible implementation manner of the present disclosure, one of the first folded edge and the second folded edge that abuts against the pole does not overlap with the laser welding area in the orthographic projection.

[0020] In the technical solution of the present disclosure, since the normal projection of the first and second folded edges on the laser welding area does not overlap the laser welding area, when the clamping member and the pole are welded by laser welding, the influence of the small gap between the clamping part and the pole on the laser welding due to the folded edges can be reduced, and the laser welding quality of the clamping member and the pole can be improved.

[0021] In a possible implementation manner of the present disclosure, one of the first and second clamping parts fixedly connected with the pole has a rough area on the welding surface facing the pole, and the rough area overlaps the laser welding area, and the rough area is used to increase the roughness of the welding surface.

[0022] In the technical solution of the present disclosure, since the rough area is provided on the welding surface of the first and second clamping parts, during the welding of the clamping member and the pole by laser welding, the reflection of the laser on the welding surface can be reduced, and the welding quality of the clamping member and the pole can be improved.

[0023] In a possible implementation manner of the present disclosure, the wall thickness of the clamping member is greater than or equal to 0.1 mm and less than or equal to 1.5 mm.

[0024] In the technical solution of the present disclosure, since the wall thickness of the clamping member is less than or equal to 1.5 mm and greater than or equal to 0.1 mm, the clamping member can have a smaller weight, which is conducive to reducing the overall weight of the battery monomer, and the welding requirements between the tab and the clamping member and between the clamping member and the pole can be met.

[0025] In a possible implementation manner of the present disclosure, the shell includes a shell body and an end cover, the shell body has an opening matched with the end cover, and the end cover has a through hole matched with the pole; the end cover is sealingly connected to the opening to form a containing cavity, and the pole extends from the containing cavity to a side of the end cover away from the containing cavity through the through hole.

[0026] In the technical solution of the present disclosure, since the shell includes a shell body and an end cover, the shell can be easily processed. Moreover, the end cover and the shell body are sealingly connected, and the shell with a sealed containing cavity can be formed.

[0027] The second aspect of the present disclosure provides a battery device, which comprises a box body and the battery monomer provided in any one of the first aspect. The box body has a mounting cavity, and the battery monomer is mounted in the mounting cavity.

[0028] The battery device provided by the present disclosure can improve the reliability of the connection between the pole and the electrode assembly, thereby improving the performance stability of the battery monomer, and further improving the stability of the battery device in operation.

[0029] The third aspect of the present disclosure provides a power consuming device, which comprises the battery cell for providing electric energy provided by any one of the first aspect or the battery device provided by the second aspect.

[0030] The power consuming device provided by the present disclosure can improve the performance stability of the battery cell, and further improve the stability and continuity of the power consuming device due to the battery cell or the power consuming device provided by the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments and are therefore not intended to limit the present disclosure, wherein the same reference notation in different drawings represents the same element. In the drawings:

[0032] FIG. 1 is a structural schematic diagram of a battery cell provided by the present disclosure;

[0033] FIG. 2 is a sectional view of FIG. 1 along the direction of A-A provided by the present disclosure;

[0034] FIG. 3 is an enlarged schematic diagram of part B of FIG. 2 provided by the present disclosure;

[0035] FIG. 4 is a structural schematic diagram of a clamping member in the battery cell provided by the present disclosure;

[0036] FIG. 5 is another structural schematic diagram of the clamping member in the battery cell provided by the present disclosure;

[0037] FIG. 6 is a structural schematic diagram of a battery device provided by the present disclosure;

[0038] FIG. 7 is an enlarged schematic diagram of part C of FIG. 6 provided by the present disclosure;

[0039] FIG. 8 is a structural schematic diagram of the clamping member in the battery cell provided by the present disclosure;

[0040] FIG. 9 is a structural schematic diagram of a battery device provided by the present disclosure;

[0041] FIG. 10 is a structural schematic diagram of a power consuming device provided by the present disclosure.

[0042] Explanation of reference signs: 1 - housing; 11 - shell; 12 - end cap; 2 - electrode assembly; 21 - tab; 3 - post; 4 - clamp; 41 - first clamping portion; 42 - second clamping portion; 43 - clamping cavity; 44 - first folded edge; 45 - second folded edge; 46 - rough area; 100 - battery device; 110 - box; 111 - first box; 112 - second box; 120 - battery cell; 200 - controller; 300 - motor; T1 - wall thickness; T2 - tab thickness; S1 - laser welding area; S2 - ultrasonic welding area. DETAILED DESCRIPTION

[0043] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0044] 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 the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "include" and "have" and any variations thereof in the specification and the above drawings description of the present disclosure are intended to cover non-exclusive inclusion.

[0045] 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 "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0046] 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 this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative 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.

[0047] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0048] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0049] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0050] 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.

[0051] New energy batteries are increasingly widely used in life and industry. New energy 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 aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0052] In many application scenarios, the battery will be subjected to vibration, and the parts inside the battery will also vibrate. In the process of vibration of the pole column and the electrode assembly in the battery, the welding between the tab on the electrode assembly and the pole column may be cracked. Or in the process of producing the battery, when welding the tab and the pole column, the tab and the pole column are cracked in the welding area due to stress and other reasons. These situations will reduce the flow area between the tab and the pole column, and reduce the reliability of the connection between the electrode assembly and the pole column, thereby affecting the normal use of the battery.

[0053] The battery cell provided by the embodiments of the present disclosure includes a shell 1, an electrode assembly 2, a pole 3 and a clamping piece 4. The shell 1 forms a receiving cavity; the electrode assembly 2 is installed in the receiving cavity and includes at least two layers of pole pieces, and a tab 21 is formed on the pole pieces; a part of the pole 3 is located in the receiving cavity at a position corresponding to the tab 21, and another part of the pole 3 extends to the outside of the shell 1 through the shell 1; the clamping piece 4 is clamped on the tab 21, and the side of the clamping piece 4 away from the tab 21 is connected with the pole 3 to electrically connect the tab 21 and the pole 3.

[0054] In the embodiments of the present disclosure, as shown in FIGS. 1 and 2, the shell 1 is used to encapsulate the electrode assembly 2 and electrolyte and the like. The shell 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 1) or an aluminum-plastic film and the like.

[0055] For example, when the shell 1 is a non-sealed structure, the shell 1 plays a role of protecting the electrode assembly 2, and a sealing bag is further included between the shell 1 and the electrode assembly 2, which is used to encapsulate the electrode assembly 2 and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating piece or an aluminum-plastic film and the like.

[0056] In the embodiments of the present disclosure, as shown in FIG. 2, the electrode assembly 2 can be installed in the receiving cavity formed by the shell 1. The electrode assembly 2 includes a positive electrode, a negative electrode and a separator. During the charging and discharging process of the battery cell 120, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the short circuit of the positive electrode and the negative electrode and allow the active ions to pass through.

[0057] For example, the positive electrode can be a positive pole piece, which can include a positive current collector and a positive active material arranged on at least one surface of the positive current collector. For example, the positive current collector can adopt a metal foil or a composite current collector. The positive active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds.

[0058] For another example, the negative electrode can be a negative pole piece, which can include a negative current collector. For example, the negative current collector can adopt a metal foil, a foam metal or a composite current collector.

[0059] In another example, the positive electrode sheets and the negative electrode sheets can be wound into a wound structure of the electrode assembly 2. A plurality of positive electrode sheets and a plurality of negative electrode sheets can also be alternately stacked to form a laminated structure of the electrode assembly 2. Positive electrode tabs can be extended from one side of the plurality of positive electrode sheets, and negative electrode tabs can be extended from one side of the plurality of negative electrode sheets, so as to lead current out of the electrode assembly 2 through the electrode tabs 21.

[0060] In the embodiments of the present disclosure, as shown in FIGS. 2 and 3, the electrode assembly 2 can be extended outside the case 1 through the poles 3, so as to connect the electrode assembly 2 with a power consuming device or an external conductor. For example, two through holes matching the poles 3 can be provided on the case 1, and the two poles 3 can be respectively arranged in the two through holes on the case 1. In this way, the positive electrode tabs can be connected with one of the poles 3, and the negative electrode tabs can be connected with the other of the poles 3, so that the electrode assembly 2 can be extended outside the case 1 through the poles 3.

[0061] In the embodiments of the present disclosure, as shown in FIG. 3, the electrode tabs 21 can be electrically connected with the poles 3 through the clamping members 4. For example, the structure and shape of the clamping members 4 can be set according to the size and shape of the electrode tabs 21. For example, the clamping members 4 can be set as a structure similar to a clamp, so as to clamp the clamping members 4 on the electrode tabs 21. In this way, the electrode tabs 21 of the laminated structure (a plurality of electrode tabs are stacked to form a positive electrode tab, and a plurality of electrode tabs are stacked to form a negative electrode tab) can be fixed through the clamping members 4.

[0062] For example, the extension direction of the electrode tabs 21 can be parallel or close to parallel with the end face of the poles 3 located in the accommodating cavities. After the clamping members 4 are clamped on the electrode tabs 21, the part of the clamping members 4 located between the electrode tabs 21 and the poles 3 can be parallel with the poles 3, and the side of the clamping members 4 away from the electrode tabs 21 can be electrically connected with the poles 3, so as to electrically connect the electrode tabs 21 with the corresponding poles 3 through the clamping members 4.

[0063] The battery monomer 120 provided by the embodiments of the present disclosure can provide protection and stable accommodation environment for the electrode assembly 2 through the shell 1 since the electrode assembly 2 is installed in the shell 1. The pole 3 can be connected with the tab 21 to extend the electrode assembly 2 outside the shell 1, so as to facilitate the electrical connection between the electrode assembly 2 and the electrical device or external conductor through the pole 3. Meanwhile, the clamping member 4 is clamped on the tab 21, and the tab 21 with the multi-layer structure can be clamped and fixed through the clamping member 4, which is conducive to improving the structural strength of the tab 21. In addition, the clamping member 4 can be electrically connected with the pole 3 to electrically connect the tab 21 and the pole 3 through the clamping member 4. Compared with the related art in which the tab 21 is directly electrically connected with the pole 3, and the tab 21 has a multi-layer structure, the connection structure between the multi-layer tab 21 and the pole 3 is prone to cracking, which reduces the flow area between the tab 21 and the pole 3. The battery monomer 120 provided by the embodiments of the present disclosure can electrically connect the tab 21 and the pole 3 through the clamping member 4, which can not only increase the strength of the tab 21 through the clamping member 4 to reduce the risk of cracking of the connection structure between the tab 21 and the pole 3, but also ensure that the tab 21 and the pole 3 have sufficient flow area even if the tab 21 cracks. Therefore, the battery monomer 120 provided by the embodiments of the present disclosure can improve the reliability of the connection between the pole 3 and the electrode assembly 2.

[0064] In some possible embodiments of the present disclosure, referring to FIG. 4 and FIG. 5, both of which show the structure of the clamping member in the battery monomer provided by the present disclosure. The clamping member 4 includes a first clamping portion 41 and a second clamping portion 42 connected in parallel. The first clamping portion 41 and the second clamping portion 42 form a clamping cavity 43, the tab 21 is fixed in the clamping cavity 43, and one of the first clamping portion 41 and the second clamping portion 42 is connected with the pole 3.

[0065] In the embodiments of the present disclosure, as shown in FIG. 4 and FIG. 5, the clamping member 4 can be provided in a U-shaped structure, that is, the clamping member 4 includes the first clamping portion 41 and the second clamping portion 42 which are parallel or close to parallel. In addition, the first clamping portion 41 and the second clamping portion 42 are connected as a whole, so that the clamping cavity 43 can be formed between the first clamping portion 41 and the second clamping portion 42 to fix at least a part of the tab 21 in the clamping cavity 43, and one of the first clamping portion 41 and the second clamping portion 42 can be fixedly connected with the pole 3.

[0066] Exemplarily, the sizes of the first clamping portion 41 and the second clamping portion 42 can be set according to the size of the tab 21. For example, the first clamping portion 41 and the second clamping portion 42 can be set as structures with the same size and shape, and the length and width of the first clamping portion 41 and the second clamping portion 42 are both smaller than the length and width of the tab 21. The distance between the first clamping portion 41 and the second clamping portion 42 can also be set according to the thickness of the tab 21. For example, the distance between the first clamping portion 41 and the second clamping portion 42 is equal to the thickness of the tab 21, or slightly smaller than the thickness of the tab 21, such as 0.2 mm smaller than the thickness of the tab 21. In this way, the clamp 4 can be clamped on the tab 21 more stably, so as to facilitate the fixed connection of the clamp 4 and the tab 21.

[0067] In the above embodiment, since the clamp 4 includes the first clamping portion 41 and the second clamping portion 42 connected and meeting the parallel relationship, the tab 21 can be clamped by the first clamping portion 41 and the second clamping portion 42, so as to connect the clamp 4 and the tab 21, and the connection area of the clamp 4 and the tab 21 can be increased. Meanwhile, one of the first clamping portion 41 and the second clamping portion 42 can be connected with the pole 3, so that the tab 21 and the pole 3 can be connected through the clamp 4, which is beneficial to reduce the cracking of the tab 21 and the pole 3 directly connected.

[0068] In some possible embodiments of the present disclosure, as shown in FIG. 4 and FIG. 5, a first folded edge 44 is formed on the end of the first clamping portion 41 away from the second clamping portion 42, and the first folded edge 44 is attached to the side of the first clamping portion 41 away from the clamping cavity 43; and / or, a second folded edge 45 is formed on the end of the second clamping portion 42 away from the first clamping portion 41, and the second folded edge 45 is attached to the side of the second clamping portion 42 away from the clamping cavity 43.

[0069] In the embodiments of the present disclosure, the folded edge can be arranged on the clamping portion of the clamp 4, so as to reduce the influence of the clamp 4 on the tab 21 through the folded edge structure.

[0070] Exemplarily, the first folded edge 44 can be formed on the end of the first clamping portion 41 away from the second clamping portion 42 by folding, and the first folded edge 44 is folded from the first clamping portion 41 in a direction away from the clamping cavity 43, and can be attached to the surface of the first clamping portion 41 away from the clamping cavity 43. In this way, the end of the first clamping portion 41 away from the second clamping portion 42 can form a relatively smooth surface.

[0071] Another example, the second folding edge 45 can also be formed on the second clamping portion 42 in a folding manner away from the first clamping portion 41, the second folding edge 45 is folded from the second clamping portion 42 away from the clamping cavity 43, and can be attached to the surface of the second clamping portion 42 away from the clamping cavity 43. In this way, the end of the second clamping portion 42 away from the first clamping portion 41 can form a relatively smooth surface.

[0072] It should be noted that the folding edge can be provided on both the first clamping portion 41 and the second clamping portion 42, or the first folding edge 44 can be provided on the first clamping portion 41, and the second folding edge 45 can be provided on the second clamping portion 42.

[0073] In the above embodiment, the first folding edge 44 is formed on the first clamping portion 41, and the second folding edge 45 is formed on the second clamping portion 42, so that the end of the first clamping portion 41 and the second clamping portion 42 can form a relatively smooth surface. In this way, after the clamping piece 4 is connected with the tab 21, the sharp corners and thin edges on the clamping piece 4 can be reduced to cut the tab 21 and cause the tab 21 to break.

[0074] In some possible embodiments of the present disclosure, referring to FIGS. 6 and 7, FIG. 6 is a structural schematic diagram of a battery device provided by the present disclosure, and FIG. 7 is an enlarged schematic diagram of part C in FIG. 6. The tab 21 and the clamping piece 4 are fixedly connected by ultrasonic welding, and an ultrasonic welding area S2 is formed between the tab 21 and the clamping piece 4; the clamping piece 4 and the pole 3 are fixedly connected by laser welding, and a laser welding area S1 is formed between the clamping piece 4 and the pole 3.

[0075] In the embodiment of the present disclosure, as shown in FIG. 7, after the clamping piece 4 is clamped on the tab 21, the clamping piece 4 and the tab 21 can be fixedly connected by welding, and the clamping piece 4 and the pole 3 are fixedly connected by welding.

[0076] For example, the clamping piece 4 and the tab 21 can be welded by ultrasonic welding. In the process of welding the clamping piece 4 and the tab 21 by ultrasonic welding, high-frequency vibration waves are transmitted to the adjacent surfaces of the clamping piece 4 and the tab 21, and under pressure, the surfaces of the clamping piece 4 and the abutting tab 21 rub against each other to form a fusion between the molecular layers, so that the tab 21 and the clamping piece 4 can be welded, and an ultrasonic welding area S2 is formed between the tab 21 and the clamping piece 4. In the process of welding the clamping piece 4 and the tab 21 by ultrasonic welding, welding can also be formed between every two adjacent layers of the tab 21 with a multi-layer lamination structure. In this way, the multi-layer tab 21 and the clamping piece 4 can be formed into a whole structure by welding.

[0077] Another example, the clamping piece 4 and the pole post 3 can be welded by laser welding. For example, after the ultrasonic welding of the clamping piece 4 and the tab 21 is completed, the clamping piece 4 is placed in the position corresponding to the pole post 3 together with the electrode assembly 2, that is, the pole post 3 is abutted with the first clamping part 41 or the second clamping part 42 on the clamping piece 4, and then the pole post 3 and the clamping piece 4 are welded by laser welding, so that the first clamping part 41 or the second clamping part 42 abutted with the pole post 3 and the pole post 3 form a laser welding area S1.

[0078] In the above embodiment, since the tab 21 and the clamping piece 4 are welded by ultrasonic welding, not only a stable and reliable laser welding area can be formed between the clamping piece 4 and the tab 21, but also the layers of the tab 21 can be welded, so that the clamping piece 4 and the tab 21 can be formed as a whole structure. At the same time, the clamping piece 4 and the pole post 3 are welded by laser welding, so that a reliable electrical connection can be formed between the clamping piece 4 and the pole post 3, thereby improving the reliability of the connection between the tab 21 and the pole post 3, and reducing the problem of the reduction of the overcurrent area of the tab 21 due to the cracking of part of the tab 21.

[0079] In some possible embodiments of the present disclosure, as shown in FIG. 7, the laser welding area S1 is located in the ultrasonic welding area S2 in the orthographic projection of the ultrasonic welding area S2.

[0080] In the embodiments of the present disclosure, as shown in FIG. 7, during the welding of the clamping piece 4 and the tab 21 by ultrasonic welding, the entire overlapping area of the clamping piece 4 and the tab 21 can be ultrasonically welded, or part of the overlapping area of the clamping piece 4 and the tab 21 can be ultrasonically welded, that is, the ultrasonic welding area S2 formed between the clamping piece 4 and the tab 21 is less than or equal to the overlapping area of the clamping piece 4 and the tab 21. During the welding of the clamping piece 4 and the pole post 3 by laser welding, the area of the laser welding area S1 formed between the clamping piece 4 and the pole post 3 is less than the area of the ultrasonic welding area S2, and the laser welding area S1 is completely located in the ultrasonic welding area S2 in the orthographic projection of the ultrasonic welding area S2.

[0081] In the above embodiment, since the laser welding area S1 is located in the ultrasonic welding area S2 in the orthographic projection of the ultrasonic welding area S2, the influence of the heat generated on the clamping piece 4 during laser welding on the ultrasonic welding area S2 can be reduced, and the stable welding structure between the clamping piece 4 and the tab 21 can be maintained.

[0082] In some possible embodiments of the present disclosure, the area of the ultrasonic welding area S2 is greater than or equal to 1.2 times the area of the laser welding area S1.

[0083] In the embodiments of the present disclosure, the area of the ultrasonic welding area S2 and the area of the laser welding area S1 can be controlled more accurately, so as to improve the reliability of the welding structure between the tab 21 and the clamping piece 4, and between the clamping piece 4 and the pole piece 3.

[0084] For example, the area of the ultrasonic welding area S2 can be 1.2 times the area of the laser welding area S1, or can be greater than 1.2 times the area of the laser welding area S1. The laser welding area S1 is projected onto the ultrasonic welding area S2 as much as possible.

[0085] In the above embodiments, since the area of the ultrasonic welding area S2 is greater than or equal to 1.2 times the area of the laser welding area S1, the edge part of the ultrasonic welding area S2 that does not overlap with the laser welding area S1 has sufficient area, so that the ultrasonic welding area S2 between the clamping piece 4 and the tab 21 has a larger area and is not affected by the heat generated on the clamping piece 4 during laser welding.

[0086] In some possible embodiments of the present disclosure, as shown in FIG. 3 and FIG. 5, one of the first folded edge 44 and the second folded edge 45 that abuts against the pole piece 3 is not overlapped with the laser welding area S1 in the projection of the laser welding area S1.

[0087] In the embodiments of the present disclosure, when the first clamping part 41 on the clamping piece 4 is welded with the pole piece 3, the first folded edge 44 on the first clamping part 41 is located between the first clamping part 41 and the pole piece 3. When the second clamping part 42 on the clamping piece 4 is welded with the pole piece 3, the second folded edge 45 on the second clamping part 42 is located between the second clamping part 42 and the pole piece 3.

[0088] For example, whether the first clamping part 41 is welded with the pole piece 3 or the second clamping part 42 is welded with the pole piece 3, it is necessary to reduce the influence of the folded edge on the welding between the clamping piece 4 and the pole piece 3. Therefore, the projection of the first folded edge 44 and the second folded edge 45 on the laser welding area S1 is located outside the laser welding area S1, that is, one of the first folded edge 44 or the second folded edge 45 has a certain gap with the laser welding area S1.

[0089] In the above embodiments, since the projection of the first folded edge 44 and the second folded edge 45 on the laser welding area S1 is not overlapped with the laser welding area S1, when the clamping piece 4 and the pole piece 3 are welded by laser welding, the influence of the small gap between the clamping part and the pole piece 3 caused by the folded edge on the laser welding can be reduced, which is beneficial to improving the laser welding quality of the clamping piece 4 and the pole piece 3.

[0090] In some possible embodiments of the present disclosure, referring to FIG. 8, which is a schematic view of a structure of the clamping member in the battery cell according to the present disclosure, the welding surface of the first clamping part 41 and the second clamping part 42 that is fixedly connected to the pole 3 and faces the pole 3 has a rough area 46, and the rough area 46 overlaps the laser welding area S1, and the rough area 46 is used to increase the roughness of the welding surface.

[0091] In the embodiments of the present disclosure, the rough area 46 can be arranged on the welding surface of the first clamping part 41 and the second clamping part 42 to increase the roughness of the welding surface through the rough area 46. The welding surface of the first clamping part 41 is the surface of the first clamping part 41 that is away from the clamping cavity 43, and the welding surface of the second clamping part 42 is the surface of the second clamping part 42 that is away from the clamping cavity 43.

[0092] For example, the first clamping part 41 and the second clamping part 42 can be embossed on the welding surface, for example, the welding surface can be rolled by a patterned embossing roller, so that the rough area 46 with unevenness is formed on the welding surface to increase the roughness of the welding surface. In addition, the rough area 46 can be made to coincide with the laser welding area S1, for example, the rough area 46 is larger than the laser welding area S1.

[0093] In the above embodiments, since the rough area 46 is arranged on the welding surface of the first clamping part 41 and the second clamping part 42, the reflection of the laser on the welding surface can be reduced during the welding of the clamping member 4 and the pole 3 by laser welding, which is beneficial to improve the welding quality of the clamping member 4 and the pole 3.

[0094] In some possible embodiments of the present disclosure, the wall thickness T1 of the clamping member 4 is greater than or equal to 0.1 mm and less than or equal to 1.5 mm.

[0095] In the embodiments of the present disclosure, the clamping member 4 can be made of a metal material, which is convenient for welding the clamping member 4 and the pole 3, and the clamping member 4 and the tab 21. In addition, the clamping member 4 can be made of a relatively thin sheet metal.

[0096] For example, the clamping member 4 can be made of aluminum, copper or alloy. In this way, better welding effect can be obtained when the clamping member 4 and the pole 3 are welded.

[0097] For another example, the clamping member 4 can be made of a sheet metal with a thickness greater than or equal to 0.1 mm and less than or equal to 1.5 mm. For example, the clamping member 4 can be processed by blanking and stamping. In this way, the wall thickness T1 of the clamping member 4 formed by processing is less than or equal to 1.5 mm and greater than or equal to 0.1 mm.

[0098] It should be noted that the wall thickness T1 of the clamping piece 4 can be measured at room temperature (for example, 25℃) by using a vernier caliper or other measuring tools.

[0099] In the above embodiments, since the wall thickness T1 of the clamping piece 4 is less than or equal to 1.5mm and greater than or equal to 0.1mm, the clamping piece 4 not only has a small weight, which is conducive to reducing the overall weight of the battery monomer 120, but also meets the welding requirements between the tab 21 and the clamping piece 4, and between the clamping piece 4 and the pole 3.

[0100] In some possible embodiments of the present disclosure, the shell 1 includes a shell body 11 and an end cover 12, the shell body 11 has an opening matched with the end cover 12, and the end cover 12 has a through hole matched with the pole 3; the end cover 12 is sealingly connected to the opening to form a containing cavity, and the pole 3 extends from the containing cavity to a side of the end cover 12 away from the containing cavity through the through hole.

[0101] In the embodiments of the present disclosure, as shown in FIG. 2, the shell 1 includes an end cover 12 and a shell body 11, the shell body 11 is provided with an opening matched with the end cover 12, and the end cover 12 seals the opening to form a containing cavity for accommodating the electrode assembly 2 and substances such as electrolyte. For example, the shell body 11 can be provided with one or more openings. The end cover 12 can also be provided with one or more openings. The end cover 12 and the opening on the shell body 11 can be sealingly connected by welding or bonding.

[0102] For example, the shape of the shell body 11 and the end cover 12 can be set according to the shape of the electrode assembly 2 in the battery monomer 120, for example, the shell body 11 is set as a cylindrical shape, and the end cover 12 is set as a disc shape; or the shell body 11 is set as a square cylindrical shape, and the end cover 12 is set as a square disc shape. In this way, a cylindrical battery monomer or a square battery monomer can be obtained.

[0103] For another example, a through hole matched with the pole 3 can be provided on the end cover 12, so that the pole 3 is arranged on the end cover 12 through the through hole, and the pole 3 extends to a side of the end cover 12 away from the containing cavity.

[0104] In the above embodiments, since the shell 1 includes the shell body 11 and the end cover 12, the shell 1 is convenient to process. Moreover, the end cover 12 and the shell body 11 are sealingly connected, so that the shell 1 with a sealed containing cavity can be formed.

[0105] In addition, the embodiments of the present disclosure also provide a battery device 100. Referring to FIG. 9, FIG. 9 is a schematic structural view II of a battery device provided by the present disclosure. As shown in FIG. 6 and FIG. 9, the battery device 100 includes a box body 110 and the battery monomer 120 provided by any one of the above embodiments. The box body 110 has a mounting cavity, and the battery monomer 120 is mounted in the mounting cavity.

[0106] In embodiments of the present disclosure, the battery apparatus 100 can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 120 connected in series, in parallel, or in a mixed connection through a busbar component.

[0107] For example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells 120 into a single module. The battery module can also be formed by bundling a plurality of battery cells 120 with a cable tie.

[0108] For another example, the battery apparatus 100 can be a battery pack including a case 110 and one or more battery cell assemblies housed in the case 110. For example, the battery cell assembly can be a battery module, which can be housed in the case 110 by fixing the battery module in the case 110. Alternatively, the battery cell assembly can be housed in the case 110 by directly fixing a plurality of battery cells 120 in the case 110.

[0109] For yet another example, the battery apparatus 100 refers to an energy storage apparatus including a case 110 having at least one side provided with a door. The energy storage apparatus includes an energy storage container, an energy storage cabinet, etc.

[0110] In embodiments of the present disclosure, as shown in FIG. 9, the case 110 can include a first case 111 and a second case 112. The first case 111 and the second case 112 are coupled so that a closed safety chamber is formed inside the case 110 to accommodate the battery cell assembly. Here, the closed refers to covering or closing, which can be sealed or unsealed. The first case 111 can be a top cover or a bottom plate.

[0111] For example, the case 110 can be used as part of the chassis structure of a vehicle. The top cover of the case 110 can become at least part of the floor of the vehicle, or the frame of the case 110 can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0112] The battery device 100 provided by the embodiments of the present disclosure can improve the reliability of the connection between the pole 3 and the electrode assembly 2, thereby improving the performance stability of the battery monomer 120, and further improving the stability of the battery device 100.

[0113] The embodiments of the present disclosure also provide a power consumption device. Referring to FIG. 10, FIG. 10 is a structural schematic diagram of a power consumption device provided by the present disclosure. The power consumption device comprises the battery monomer 120 provided by any one of the above embodiments or the battery device 100 provided by the above embodiments.

[0114] In the embodiments of the present disclosure, the power consumption device provides electric energy by the battery monomer 120 or the battery device 100 provided by the above embodiments. For example, the power consumption device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0115] In the following embodiments, for the convenience of description, the power consumption device of an embodiment of the present disclosure is taken as a vehicle for example. The following is described in combination with the drawings.

[0116] As shown in FIG. 10, the vehicle can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle is internally provided with the battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle. The battery device 100 can be used to supply power to the vehicle, for example, the battery device 100 can be used as the operating power source of the vehicle. The vehicle can also comprise a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle during starting, navigation and driving.

[0117] In the embodiments of the present disclosure, the battery device 100 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0118] The power consumption device provided by the embodiments of the present disclosure can improve the performance stability of the battery monomer 120, and further improve the stability and continuity of the power consumption device.

[0119] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the specification of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, comprising: a housing enclosing a receiving cavity; an electrode assembly installed in the receiving cavity, the electrode assembly comprising at least two layers of electrode tabs, the electrode tabs extending to form a tab; a post, a portion of the post being located in the receiving cavity corresponding to the tab, and another portion of the post extending through the housing to outside of the housing; a clamp clamped on the tab, a side of the clamp away from the tab being connected with the post to electrically connect the tab with the post.

2. The battery cell of claim 1, wherein, The clamp comprises a first clamping portion and a second clamping portion connected and satisfying a parallel relationship, a clamping cavity being formed between the first clamping portion and the second clamping portion, the tab being fixed in the clamping cavity, and one of the first clamping portion and the second clamping portion being connected with the post.

3. The battery cell of claim 2, wherein, An end of the first clamping portion away from the second clamping portion forms a first folded edge, the first folded edge being attached to a side of the first clamping portion away from the clamping cavity; and / or an end of the second clamping portion away from the first clamping portion forms a second folded edge, the second folded edge being attached to a side of the second clamping portion away from the clamping cavity.

4. The battery cell of claim 3, wherein, The tab and the clamp are fixedly connected by ultrasonic welding, an ultrasonic welding area being formed between the tab and the clamp; and the clamp and the post are fixedly connected by laser welding, a laser welding area being formed between the clamp and the post.

5. The battery cell of claim 4, wherein, A normal projection of the laser welding area on the ultrasonic welding area is located in the ultrasonic welding area.

6. The battery cell of claim 5, wherein, An area of the ultrasonic welding area is greater than or equal to 1.2 times an area of the laser welding area.

7. The battery cell of claim 4 or 5, wherein, One of the first folded edge and the second folded edge abutting against the post has a normal projection on the laser welding area which does not overlap the laser welding area.

8. The battery cell of any one of claims 4 to 7, wherein, A welding surface of one of the first clamping portion and the second clamping portion fixedly connected with the post, which faces the post, has a rough area, the rough area overlapping the laser welding area, and the rough area being used to increase roughness of the welding surface.

9. The battery cell of any one of claims 1 to 8, wherein, A wall thickness of the clamp is greater than or equal to 0.1 mm and less than or equal to 1.5 mm.

10. The battery cell of any one of claims 1 to 8, wherein, The housing comprises a shell and an end cover, the shell having an opening matched with the end cover, and the end cover having a via hole matched with the post; the end cover is sealingly connected on the opening to form the receiving cavity, and the post extends from the receiving cavity to a side of the end cover away from the receiving cavity through the via hole. 11.A battery device, comprising: a box having a mounting cavity; the battery cell according to any one of claims 1 to 10, the battery cell being installed in the mounting cavity. 12.A power consuming device, the power consuming device comprising the battery cell according to any one of claims 1 to 10 or the battery device according to claim 11 for providing electric energy.

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