Battery cell and electric equipment

Abstract

The utility model provides a battery cell and electric equipment, the battery cell can comprise an electrode assembly, a cover plate assembly, a compression ring and a pole, and the cover plate assembly is located at one side of the electrode assembly; the pressing ring is located on the side, away from the electrode assembly, of the cover plate assembly, and the pole penetrates through the cover plate assembly and is detachably connected with the pressing ring. Compared with the prior art that the compression ring and the pole are connected in a welding mode, the assembly process is simpler, and only the compression ring and the pole need to be detachably connected. And if the pressing ring is damaged, the pressing ring can be conveniently replaced in time. In addition, welding slag caused in the welding process is reduced, the risk that the welding slag falls into the battery cell is reduced, and the reject ratio of the battery is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a battery cell and electric equipment. BACKGROUND

[0002] In the related art, the pole and the compression ring are often connected by welding, and in the process of welding the pole and the compression ring, welding slag is easily generated. If the welding slag falls into the battery cell, it is not easy to find, and the falling welding slag can easily cause short circuit of the battery cell. SUMMARY

[0003] Embodiments of the utility model provide a battery cell and electric equipment, which can improve the above technical problems.

[0004] In a first aspect, embodiments of the utility model provide a battery cell, comprising:

[0005] An electrode assembly;

[0006] A cover plate assembly located on one side of the electrode assembly;

[0007] A compression ring located on a side of the cover plate assembly away from the electrode assembly; and

[0008] A pole, the pole is arranged in the cover plate assembly and is detachably connected with the compression ring.

[0009] In an embodiment, the compression ring is screwed with the pole.

[0010] In an embodiment, the pole includes positive poles and negative poles arranged along a first direction, the cover plate assembly includes a cover plate, the cover plate extends along the first direction and forms opposite positive and negative ends, the positive end is provided with a positive hole for the positive pole to pass through, the negative end is provided with a negative hole for the negative pole to pass through, the compression ring includes a positive compression ring and a negative compression ring, the positive compression ring is detachably connected with the positive pole, and the negative compression ring is detachably connected with the negative pole.

[0011] In an embodiment, the electrode assembly includes a plurality of monomers, and the plurality of monomers are arranged along a second direction perpendicular to the first direction.

[0012] In an embodiment, the battery cell further includes a positive connection piece and a negative connection piece, one end of the positive connection piece is connected with positive poles of the plurality of monomers, the other end of the positive connection piece is connected with the positive pole, one end of the negative connection piece is connected with negative poles of the plurality of monomers, and the other end of the negative connection piece is connected with the negative pole.

[0013] The positive connection piece is integrally formed with the positive pole; and / or

[0014] The negative connection piece is integrally formed with the negative pole post.

[0015] In an embodiment, the cover plate is provided with a first positioning member, the compression ring is provided with a second positioning member, and the second positioning member is used to cooperate with the first positioning member to connect the compression ring and the cover plate.

[0016] In an embodiment, the first positioning member comprises a first opening hole formed in the cover plate, and the second positioning member comprises a first protruding part arranged on a side of the compression ring facing the electrode assembly.

[0017] In an embodiment, the first positioning member comprises a second protruding part arranged on a side of the cover plate facing the compression ring, and the second positioning member comprises a second opening hole formed in the compression ring.

[0018] In an embodiment, the cover plate assembly comprises a cover plate, an upper plastic part, a lower plastic part, and a sealing ring, the pole post is sequentially arranged in the lower plastic part, the sealing ring, the cover plate, and the upper plastic part, and is detachably connected with the compression ring.

[0019] In an embodiment, the compression ring is provided with a threaded hole, and the pole post is provided with a thread matched with the threaded hole.

[0020] In an embodiment, the pole post is arranged in the compression ring, and at least part of the pole post is arranged outside the compression ring.

[0021] In an embodiment, the height of the pole post arranged outside the compression ring is 1mm.

[0022] In a second aspect, an embodiment of the utility model provides a kind of electric equipment, comprising the electric core described above.

[0023] The embodiment of the utility model has the following beneficial effects:

[0024] In the embodiment of the utility model, the pole post and the compression ring are detachably connected, so that the compression ring and the pole post are easily connected, and compared with the related art, the compression ring and the pole post are connected by welding, the assembly process of the application is simpler, and the compression ring and the pole post are only connected by detachable connection. In addition, the welding residue is also reduced, and the risk of the welding residue falling into the electric core is also reduced, and the battery failure rate is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0026] Figure 1 is a three-dimensional schematic view of the battery cell provided by the embodiment of the present application;

[0027] Figure 2 is Figure 1 an exploded view;

[0028] Figure 3 is Figure 1 a partial enlarged view of A of

[0029] Figure 4 is Figure 1 a partial enlarged view of B of

[0030] Figure 5 is Figure 1 a structural schematic view of a part of the battery cell in

[0031] Figure 6 is Figure 5 a structural schematic view of the battery cell in which the compression ring and the upper plastic part are removed;

[0032] Figure 7 is Figure 6 a structural schematic view of the battery cell in which the cover plate assembly is removed;

[0033] Figure 8 is Figure 7 a partial enlarged view of C of

[0034] Explanation of reference signs:

[0035] 10, electrode assembly; 110, pole; 11, positive pole; 13, negative pole; 101, single body; 103, positive tab; 105, negative tab;

[0036] 30, cover plate assembly; 31, cover plate; 311, positive terminal; 312, positive hole; 313, negative terminal; 314, negative hole; 301, positive connecting piece; 303, negative connecting piece; 304, upper plastic part; 305, lower plastic part; 306, sealing ring; 3041, positive upper plastic; 3061, first groove; 307, second groove;

[0037] 50, compression ring; 51, positive compression ring; 53, negative compression ring; 55, outer side surface; 57, inner side surface. DETAILED DESCRIPTION

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] Firstly, this application relates to a battery cell, please refer to... Figure 1 as well as Figure 2 The battery cell may include an electrode assembly 10, a cover plate assembly 30, a pressure ring 50, and a terminal post 110. The cover plate assembly 30 may be located on one side of the electrode assembly 10, and the pressure ring 50 may be located on the side of the cover plate assembly 30 opposite to the electrode assembly 10. Alternatively, the cover plate assembly 30 may be located between the pressure ring 50 and the electrode assembly 10. The terminal post 110 passes through the cover plate assembly 30 and is detachably connected to the pressure ring 50. The electrode assembly 10 can be a core package, serving as the basis for electrochemical reactions occurring inside the battery cell. The terminal post 110 acts as a bridge connecting the internal circuitry of the battery cell to the external environment, and can be located at the top or bottom of the battery cell for conducting current in and out of the cell.

[0040] The main function of the cover assembly 30 is to fix and seal the electrode assembly 10 inside the battery cell, ensuring the safety and reliability of the battery cell during charging and discharging. The battery cell can be a wound type or a stacked type; this application embodiment does not limit this.

[0041] The terminals 110 are the positive and negative output terminals of the battery cell, used to connect to external circuits. These terminals can be made of metal. In some examples, the terminals may specifically include a positive terminal 11 and a negative terminal 13. The positive terminal can be electrically connected to the cover plate, with resistance increased by a conductive material (such as conductive plastic or silicon carbide) to prevent electro-corrosion. The negative terminal can be electrically insulated from the cover plate, with electrical insulation achieved through an insulating material (such as an insulating seal).

[0042] The pressure ring 50 is used to ensure the sealing performance of the cover assembly 30. The pressure ring 50 can be made of a metallic material with good strength and corrosion resistance.

[0043] In these embodiments, the pole column 110 and the compression ring 50 are detachably connected. The pole column 110 and the compression ring 50 can be connected by clamping, screwing, or the like. Thus, the compression ring 50 and the pole column 110 are connected conveniently.

[0044] In the related art, the pole column and the compression ring are often connected by welding. In the process of welding the pole column and the compression ring, welding slag is easily generated. If the welding slag falls into the battery cell, it is not easy to find, and the falling welding slag can easily cause the battery cell to short circuit. Compared with the related art, the compression ring and the pole column are connected by welding. The assembly process of the present application is simpler, and only needs to connect the compression ring and the pole column by a detachable connection. If the compression ring is damaged, it is also convenient to replace it in time. In addition, the welding slag brought by the welding process is also reduced, thereby reducing the risk of the welding slag falling into the battery cell and reducing the defective rate of the battery cell.

[0045] In some embodiments, the compression ring 50 and the pole column 110 can be screwed. In this way, the compression ring 50 and the pole column 110 are connected tightly.

[0046] In some embodiments, the compression ring 50 is provided with a threaded hole, and the pole column 110 is provided with a thread matched with the threaded hole. In these embodiments, the compression ring 50 and the pole column 110 can be connected by rotating the compression ring 50.

[0047] Please refer to Figure 2 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the pole column 110 includes a positive pole column 11 and a negative pole column 13 arranged along a first direction, the cover plate assembly 30 includes a cover plate 31, the cover plate 31 extends along the first direction and forms opposite positive ends 311 and negative ends 313, the positive ends 311 are provided with positive holes 312 for the positive pole column 11 to pass through, the negative ends 313 are provided with negative holes 314 for the negative pole column 13 to pass through, the compression ring 50 includes a positive compression ring 51 and a negative compression ring 53, the positive compression ring 51 is detachably connected with the positive pole column 11, and the negative compression ring 53 is detachably connected with the negative pole column 13.

[0048] In these embodiments, please refer to Figure 2 The first direction can be the length direction of the electrode assembly 10, and the pole column 110 includes a positive pole column 11 and a negative pole column 13 arranged along the first direction. The cover plate 31 is the main part of the cover plate assembly 30, which specifically supports the entire cover plate assembly 30. The cover plate 31 can be made of high-purity aluminum, which has good electrical conductivity and corrosion resistance. The cover plate 31 can be provided with a plurality of holes for mounting the positive pole column 11 and the negative pole column 13 of the electrode assembly 10, and can also be used to mount the explosion-proof valve and other components.

[0049] The cover plate 31 extends along the first direction and forms opposite positive and negative ends 311 and 313, so that the extension direction of the cover plate 31 is consistent with the length direction of the electrode assembly 10, that is, both are the first direction. The positive end 311 of the cover plate 31 can be provided with a positive hole 312 for the positive pole 11 to pass through, and the negative end 313 of the cover plate 31 can be provided with a negative hole 314 for the negative pole 13 to pass through, so that the shape of the cover plate 31 is adapted to the shape of the electrode assembly 10, facilitating the installation of the positive pole 11 and the negative pole 13 with the cover plate assembly 30.

[0050] The compression ring 50 includes a positive compression ring 51 and a negative compression ring 53, the positive compression ring 51 is detachably connected with the positive pole 11, and the negative compression ring 53 is detachably connected with the negative pole 13. That is, the positive pole 11 is detachably connected with the positive compression ring 51 after passing through the positive hole 312, and the negative pole 13 is detachably connected with the negative compression ring 53 after passing through the negative hole 314.

[0051] Please refer to Figure 2 and Figure 5 In some embodiments, the electrode assembly 10 includes a plurality of single bodies 101, and the plurality of single bodies 101 are arranged along a second direction perpendicular to the first direction. In these embodiments, in order to improve the energy density of the battery cell, the structure design of the plurality of single bodies 101 can be used to connect the plurality of single bodies 101 together and integrate them into one battery cell. The space inside the battery cell can be fully utilized to improve the energy density of the battery cell.

[0052] In some embodiments, the battery cell further includes a tab, which serves as a bridge between the internal and external circuits of the battery cell to realize the input and output of current. The tab specifically includes a positive tab 103 and a negative tab 105, wherein the positive tab 103 can be a metal conductor that leads the positive pole out of the single body 101, and the negative tab 105 can be a metal conductor that leads the negative pole out of the single body 101.

[0053] Please refer to Figure 3 , Figure 4 In some embodiments, the battery cell further includes a connecting sheet, which can connect a plurality of single bodies 101 in parallel or series. The connecting sheet specifically includes a positive connecting sheet 301 and a negative connecting sheet 303, one end of the positive connecting sheet 301 is connected with the positive poles of the plurality of single bodies 101, or in other words, one end of the positive connecting sheet 301 is connected with the positive tabs 103 of the plurality of single bodies 101. Specifically, one end of the positive connecting sheet 301 can be welded with the positive tab 103. The other end of the positive connecting sheet 301 is connected with the positive pole 11, so as to converge the positive poles of the plurality of single bodies 101 into one total positive pole at the positive pole 11.

[0054] One end of the negative electrode connecting piece 303 is connected to the negative electrode of the plurality of single bodies 101, and can also be said that the one end of the negative electrode connecting piece 303 is connected to the negative electrode tab 105 of the plurality of single bodies 101. Specifically, the one end of the negative electrode connecting piece 303 can be welded with the negative electrode tab 105, and the other end of the negative electrode connecting piece 303 is connected to the negative electrode pole 13, so as to converge the negative electrodes of the plurality of single bodies 101 into one total negative electrode at the negative electrode pole 13.

[0055] In some embodiments, the positive electrode connecting piece 301 and the positive electrode pole 11 can be integrally formed. In some examples, the positive electrode connecting piece 301 and the positive electrode pole 11 can be integrally formed by casting. The positive electrode connecting piece 301 can specifically include an aluminum connecting piece.

[0056] In related technologies, the positive electrode connecting piece 301 and the positive electrode pole 11 are connected by the process of ultrasonic welding, and in the present application, the positive electrode connecting piece 301 and the positive electrode pole 11 are designed to be integrally formed, which can reduce one process step and reduce the production line time cost.

[0057] In some embodiments, the negative electrode connecting piece 303 and the negative electrode pole 13 can be integrally formed. In some examples, the negative electrode connecting piece 303 and the negative electrode pole 13 can be integrally formed by casting. The negative electrode connecting piece 303 can specifically include a copper connecting piece.

[0058] In some embodiments, the material of the positive electrode pole 11 is aluminum, and the material of the negative electrode pole 13 is a composite plate of aluminum and copper. Specifically, the bottom of the negative electrode pole 13 and the junction of the negative electrode connecting piece 303 can be made of copper, and the top of the negative electrode pole 13 can be made of aluminum.

[0059] In related technologies, the negative electrode connecting piece 303 and the negative electrode pole 13 are connected by the process of ultrasonic welding, and in the present application, the negative electrode connecting piece 303 and the negative electrode pole 13 are designed to be integrally formed, which can reduce one process step and reduce the production line time cost.

[0060] In some embodiments, the positive electrode connecting piece 301 and the positive electrode pole 11 are integrally formed. At the same time, the negative electrode connecting piece 303 and the negative electrode pole 13 are integrally formed. In the present application, the positive electrode connecting piece 301 and the positive electrode pole 11 are designed to be integrally formed, and the negative electrode connecting piece 303 and the negative electrode pole 13 are designed to be integrally formed, which can reduce one process step and reduce the production line time cost.

[0061] In some embodiments, the cover plate 31 is provided with a first positioning piece, and the compression ring is provided with a second positioning piece, and the second positioning piece is used to cooperate with the first positioning piece to connect the compression ring 50 and the cover plate 31.

[0062] In some specific embodiments, the first positioning member can include a first opening formed in the cover plate 31, and the second positioning member can include a first protrusion disposed on a side of the compression ring 50 facing the electrode assembly 10. In this way, the compression ring and the cover plate 31 can be assembled by snap fitting through the first opening and the first protrusion.

[0063] In some specific embodiments, the first positioning member can include a second protrusion disposed on a side of the cover plate 31 facing the compression ring 50, and the second positioning member can include a second opening formed in the compression ring 50. In this way, the compression ring 50 and the cover plate 31 can be assembled by snap fitting through the second opening and the second protrusion.

[0064] In these specific embodiments, the compression ring 50 and the cover plate 31 can be assembled by snap fitting through the first positioning member and the second positioning member, which makes the connection more convenient.

[0065] Please refer to Figure 1 and Figure 2 In some embodiments, the cover plate assembly 30 includes a cover plate 31, an upper plastic member 304, a lower plastic member 305, and a sealing ring 306. The pole 110 is sequentially disposed in the lower plastic member 305, the sealing ring 306, the cover plate 31, and the upper plastic member 304, and is detachably connected to the compression ring 50.

[0066] The cover plate 31 serves to support the entire cover plate assembly 30 and connect the positive and negative poles. It can be made of high-purity aluminum, which has good electrical conductivity and corrosion resistance. The cover plate 31 can be provided with a plurality of through holes for mounting the pole 110, the upper plastic member 304, the lower plastic member 305, and the sealing ring 306.

[0067] The upper plastic part 304 can be used to protect the upper part of the cover plate assembly 30 from the influence of the external environment on the battery cell. The upper plastic part 304 can be made of plastic with high temperature resistance and good insulation. The upper plastic part 304 is tightly attached to the cover plate 31 and other components such as the pole. The insulation and temperature resistance of the cover plate 31 can effectively protect the cover plate assembly from damage by the external environment to the battery cell. The lower plastic part 305 can be used to compress the diaphragm, limit the winding core and protect the explosion-proof valve. The lower plastic part 305 can be made of insulating materials such as PP polypropylene. The lower plastic part 305 can be installed at the lower part of the cover plate 31 (or the side of the cover plate 31 close to the electrode assembly 10), and is tightly attached to the cover plate 31 and other components such as the pole. The design of the lower plastic part 305 can effectively prevent the movement of the internal structure of the battery cell, improving the stability and safety of the battery cell. The sealing ring 306 can be used to ensure the sealing between the pole 110 and the cover plate 31, preventing electrolyte leakage and external moisture from entering the battery cell. The sealing ring 306 can be usually made of rubber or plastic, and has good sealing performance and chemical corrosion resistance. The sealing ring 306 can be installed between the pole 110 and the cover plate 31, and can be fixed by the compression ring 50.

[0068] In some embodiments, the cover plate assembly 30 can also include an explosion-proof valve (not shown in the figure). When the internal pressure of the battery cell exceeds the safe range, the explosion-proof valve will open to release the internal gas and prevent the battery cell from exploding. The explosion-proof valve can be provided on the cover plate 31 and will rupture or open to release gas when the internal pressure reaches a predetermined value. In some embodiments, the cover plate assembly 30 can also include a protective sheet (not shown in the figure). The protective sheet can be used to protect the electrode assembly inside the battery cell from damage by the external environment. The protective sheet can be made of metal or plastic and has good electrical conductivity and corrosion resistance. The protective sheet is tightly attached to the electrode assembly and other components such as the pole. The design of the protective sheet can effectively prevent damage to the internal structure of the battery cell by the external environment, improving the stability and safety of the battery cell.

[0069] In some embodiments, the compression ring 50 can be provided with a threaded hole, and the outer periphery of the pole 110 can be provided with threads matching the threaded hole. In this way, the compression ring and the pole can be assembled into one body by torque, and then the upper plastic part 304 can be assembled onto the compression ring 50.

[0070] In some embodiments, the pole 110 passes through the compression ring 50, and at least part of the pole 110 passes out of the compression ring 50.

[0071] In some embodiments, the height of the pole 110 passing out of the compression ring 50 is 1mm. This helps to clearly define the welding area.

[0072] In the embodiments, the positive electrode tab 103 is welded with the positive electrode connecting tab 301, and the negative electrode tab 105 is welded with the negative electrode connecting tab 303. Through the design of the positive electrode tab 103 and the negative electrode tab 105, the length of the positive electrode tab 103 and the negative electrode tab 105 is reduced, which can reduce the loss of the foil material, reduce the cost, reduce the cutting tab process, and improve the production efficiency. In addition, the risk of insertion of the positive electrode tab 103 and the negative electrode tab 105 is effectively reduced, and the production yield of the battery cell is improved.

[0073] In some embodiments, when assembled, the lower plastic part 305 can be sleeved on the positive electrode pole 11 and the negative electrode pole 13 respectively, and then a sealing ring 306 can be sleeved on the positive electrode pole 11 and the negative electrode pole 13 respectively, and then the two ends of the cover plate 31 can be installed on the positive electrode pole 11 and the negative electrode pole 13 respectively. The side of the cover plate 31 away from the lower plastic part 305 can be provided with a first groove 3061.

[0074] For ease of description, the upper plastic part 304 can include a positive electrode upper plastic 3041 and a negative electrode upper plastic, and the battery cell can include a structure part of a positive electrode and a structure part of a negative electrode. Hereinafter, the structure part of the positive electrode of the battery cell is described. The structure part of the negative electrode of the battery cell can be referred to the structure part of the positive electrode of the battery cell.

[0075] The positive electrode upper plastic 3041 is placed in the first groove 3061, and the side of the positive electrode upper plastic 3041 away from the lower plastic part 305 is provided with a second groove 307. The positive electrode compression ring 51 is assembled in the second groove 307 and sleeved on the positive electrode pole 11.

[0076] In some embodiments, the positive electrode compression ring 51 is a circular ring, and the positive electrode compression ring 51 includes an inner side 57 and an outer side 55. The inner side 57 is provided with a thread. When the positive electrode compression ring 51 is sleeved on the positive electrode pole 11, the inner side 57 of the positive electrode compression ring 51 is threadedly connected with the outer periphery of the positive electrode pole 11, so that the positive electrode compression ring 51 is screwed with the positive electrode pole 11 by twisting the positive electrode compression ring 51. The outer side of the positive electrode compression ring 51 is opposite to the groove wall of the second groove 307, so that the compression ring is limited in the second groove 307.

[0077] In some embodiments, the side of the positive electrode compression ring 51 facing the second groove 307 can be provided with a first protrusion, the cover plate 31 is provided with a first opening hole matched with the first protrusion, and the positive electrode upper plastic 3041 can be provided with a corresponding through hole. The through hole is arranged corresponding to the first opening hole, and the first protrusion is assembled corresponding to the through hole and the first opening hole.

[0078] In some embodiments, since the positive pressure ring 51 is screwed with the positive pole post 11, in the process of twisting the pressure ring, when the first protrusions of the positive pressure ring 51 are found to be repositioned and assembled into the first openings on the cover plate 31, the positive pressure ring 51 and the positive pole post 11 are assembled in place. Moreover, the stable connection between the pressure ring and the cover plate is achieved through the cooperation of the first protrusions and the first openings.

[0079] In some embodiments, the number of first protrusions can be multiple, such as two, three, four, etc., according to actual needs. The multiple first protrusions are symmetrically arranged on the side of the positive pressure ring 51. In some embodiments, the angle between every two adjacent first protrusions is the same. In this way, the number of times of feeling the concave-convex cooperation can indicate the angle of twisting. The angle of twisting required can be set to be the same as the angle between every two adjacent first protrusions, or a multiple of the angle, so that the number of times of feeling the concave-convex cooperation can indicate the angle of twisting, facilitating the assembly of the positive pressure ring 51 and the positive pole post 11 in place.

[0080] In some embodiments, the first openings can be through holes.

[0081] In some embodiments, the material of the positive pressure ring 51 can be the same as that of the cover plate 31.

[0082] In some embodiments, the upper plastic part 304 can be assembled last, i.e., after the pressure ring 50 and the pole post are assembled in place, the upper plastic part 304 is assembled and fitted on the outer periphery of the pressure ring 50.

[0083] In some embodiments, the side of the positive pressure ring 51 facing the second groove 307 can be provided with a second opening, the cover plate 31 is provided with a second protrusion cooperating with the second opening, and the upper plastic part 304 is provided with a corresponding through hole. The through hole is arranged corresponding to the second protrusion and is assembled into the second protrusion. The positive pressure ring 51 is assembled into the second groove 307 and is assembled corresponding to the second protrusion. Since the positive pressure ring 51 is screwed with the positive pole post 11, in the process of twisting the pressure ring, when the second opening of the positive pressure ring 51 is found to be assembled into the second protrusion on the cover plate 31, the positive pressure ring 51 and the positive pole post 11 are assembled in place. Moreover, the stable connection between the positive pressure ring 51 and the cover plate 31 is achieved through the cooperation of the second opening and the second protrusion.

[0084] Through the technical scheme of the present application, the welding steps of the pole post and the pressure ring are reduced, thereby optimizing the assembly process. The falling of impurities in the welding process is reduced, and the risk of internal short circuit is reduced. The height of the tab is reduced, thereby reducing the amount of foil material, reducing the cost, and reducing the risk of tab reverse insertion. In addition, through the technical scheme of the present application, the internal space proportion of the electrode assembly of the cover plate can be effectively reduced, thereby increasing the height of the pole piece and effectively improving the volume energy density of the battery cell.

[0085] In the related art, for example, an aluminum shell battery cell usually needs to reserve at least 8mm space at the top for the welding of the cover plate assembly and the connecting piece, the connecting piece and the tab, resulting in low space utilization inside the battery cell, limited design capacity, and low volumetric energy density. By the technical solution of the present application, the connection between the compression ring 50 and the pole 110 is moved upward, so only less top space needs to be reserved, and only 6mm top space needs to be reserved at most, thereby effectively improving the utilization of the internal space of the battery cell and the volumetric energy density of the battery cell.

[0086] In a second aspect, the present application relates to a power consuming device comprising the above-mentioned battery cell.

[0087] In the embodiments of the present application, the pole and the compression ring are detachably connected. Thus, the connection between the compression ring and the pole is facilitated, and compared with the related art in which the compression ring and the pole are connected by welding, the assembly process of the present application is simpler, and only the compression ring and the pole need to be connected by detachable connection. Moreover, if the compression ring is damaged, it can be replaced in time. In addition, the welding slag caused by the welding process is also reduced, thereby reducing the risk of the welding slag falling into the battery cell and reducing the defective rate of the battery cell.

[0088] The above has introduced the embodiments of the present application in detail, and the principle and implementation mode of the present application have been described by applying specific examples. The above embodiment description is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range can be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A battery cell, characterized in that, include: Electrode assembly (10); The cover plate assembly (30) is located on one side of the electrode assembly (10); A pressure ring (50) is located on the side of the cover plate assembly (30) opposite to the electrode assembly (10); and A pole post (110) is inserted through the cover plate assembly (30) and detachably connected to the pressure ring (50).

2. The battery cell according to claim 1, characterized in that, The pressure ring (50) is screwed to the pole post (110).

3. The battery cell according to claim 1 or 2, characterized in that, The electrode post (110) includes a positive electrode post (11) and a negative electrode post (13) arranged along a first direction. The cover plate assembly (30) includes a cover plate (31) that extends along the first direction and forms opposing positive terminals (311) and negative terminals (313). The positive terminal (311) has a positive electrode hole (312) through which the positive electrode post (11) passes, and the negative terminal (313) has a negative electrode hole (314) through which the negative electrode post (13) passes. The pressure ring (50) includes a positive pressure ring (51) and a negative pressure ring (53). The positive pressure ring (51) is detachably connected to the positive electrode post (11), and the negative pressure ring (53) is detachably connected to the negative electrode post (13).

4. The battery cell according to claim 3, characterized in that, The electrode assembly (10) includes a plurality of monomers (101), which are arranged along a second direction perpendicular to the first direction.

5. The battery cell according to claim 4, characterized in that, The battery cell further includes a positive electrode connecting piece (301) and a negative electrode connecting piece (303). One end of the positive electrode connecting piece (301) is connected to the positive electrode of multiple individual cells (101), and the other end of the positive electrode connecting piece (301) is connected to the positive electrode post (11). One end of the negative electrode connecting piece (303) is connected to the negative electrode of multiple individual cells (101), and the other end of the negative electrode connecting piece (303) is connected to the negative electrode post (13). The positive electrode connecting piece (301) is integrally formed with the positive electrode post (11); and / or The negative electrode connecting piece (303) is integrally formed with the negative electrode post (13).

6. The battery cell according to any one of claims 2 to 5, characterized in that, The cover plate (31) is provided with a first positioning member, and the pressure ring is provided with a second positioning member. The second positioning member is used to cooperate with the first positioning member to connect the pressure ring and the cover plate (31).

7. The battery cell according to claim 6, characterized in that, The first positioning member includes a first opening in the cover plate (31), and the second positioning member includes a first protrusion, which is disposed on the side of the pressure ring facing the electrode assembly.

8. The battery cell according to claim 6, characterized in that, The first positioning member includes a second protrusion, which is disposed on the side of the cover plate facing the pressure ring, and the second positioning member includes a second opening formed in the pressure ring.

9. The battery cell according to claim 1 or 2, characterized in that, The cover plate assembly (30) includes a cover plate (31), an upper plastic part (304), a lower plastic part (305), and a sealing ring (306). The electrode post of the electrode assembly (10) is sequentially inserted through the lower plastic part (305), the sealing ring (306), the cover plate (31), and the upper plastic part (304), and is detachably connected to the pressure ring (50).

10. The battery cell according to claim 2, characterized in that, The pressure ring has a threaded hole, and the outer periphery of the pole (110) has a thread that mates with the threaded hole.

11. The battery cell according to claim 2, characterized in that, The pole is inserted through the pressure ring (50), and at least a portion of the pole extends out of the pressure ring (50).

12. The battery cell according to claim 11, characterized in that, The pole extends 1 mm beyond the pressure ring (50).

13. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1 to 12.

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