Battery monomer, battery device, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device, an energy storage device and a power utilization device, the battery monomer comprises a shell, an electrode assembly and a cover plate assembly, the end part of the shell is provided with an opening, the electrode assembly is arranged in the shell and is provided with a tab, the cover plate assembly is arranged on the shell to cover the opening, and the cover plate assembly comprises a cover plate and an insulating part; the cover plate is provided with a pole electrically connected with the tab, the insulating part is located between the cover plate and the electrode assembly, the cover plate is provided with at least one fixing hole, the insulating part is provided with at least one fixing column matched with the fixing hole to fixedly connect the cover plate and the insulating part, the fixing column comprises a first part and a second part which are connected with each other, the first part is located in the fixing hole, and the second part is located in the second part. The second part is located on the side, away from the insulating part, of the first part, the cross section area of the second part is larger than that of the first part, and the cover plate assembly is constructed to meet the condition that n is larger than or equal to KM / (FS), and n is the number of the fixing columns; m is the weight of the electrode assembly; s is the cross sectional area of the single first part; k is more than or equal to 5 and less than or equal to 9; f is larger than or equal to 15N / mm < 2 > and smaller than or equal to 25N / mm < 2 >. The connection strength of the cover plate and the insulating part is improved, the cover plate and the insulating part are prevented from being separated in the assembly process of the battery monomer to a certain extent, and the performance of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device, an energy storage device and a power utilization device. BACKGROUND

[0002] In the prior art, in order to protect the battery monomer, an insulating piece is usually arranged between the cover plate and the electrode assembly of the battery monomer, which can also avoid the leakage of the battery monomer to a certain extent and improve the use safety of the battery monomer.

[0003] In order to realize the fixed connection of the cover plate and the insulating piece, a hot melting point is usually arranged between the insulating piece and the cover plate, but the existing hot melting point is easy to be pulled off during the assembly of the battery monomer, thereby causing the separation of the insulating piece and the cover plate and affecting the performance of the battery monomer. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a battery monomer, a battery device, an energy storage device and a power utilization device, which can avoid the pulling off of the fixed point connecting the cover plate and the insulating piece during the assembly of the battery monomer to a certain extent.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising: a shell, an end of the shell being provided with an open port; an electrode assembly, the electrode assembly being arranged in the shell, the electrode assembly being provided with a tab; a cover plate assembly, the cover plate assembly being arranged in the shell to cover the open port, the cover plate assembly comprising a cover plate and an insulating piece, the cover plate being provided with a pole post electrically connected with the tab, the insulating piece being located between the cover plate and the electrode assembly, the cover plate being provided with at least one fixing hole, the insulating piece being provided with at least one fixing post matched with the fixing hole to fixedly connect the cover plate and the insulating piece, the fixing post comprising a first part and a second part connected with each other, the first part being located in the fixing hole, the second part being located on a side of the first part away from the insulating piece, a cross-sectional area of the second part being greater than a cross-sectional area of the first part; the cover plate assembly is configured to satisfy: n≥KM / (FS), wherein n is the number of the fixing post; M is the weight of the electrode assembly, the unit of M being N, the value range of M being 50N≤M≤120N; S is the cross-sectional area of a single first part, the unit of S being mm 2 ; the value range of K being 5≤K≤9; the unit of F being N / mm 2 , the value range of F being 15N / mm 2 ≤F≤25N / mm 2 .

[0006] In the technical scheme, the number n of the fixing columns, the weight M of the electrode assembly and the first part cross-sectional area S of the single fixing column are set to meet certain conditions, so that the fixing columns are used to stably connect the cover plate and the insulating piece, the phenomenon that the fixing columns between the cover plate and the insulating piece are pulled off due to the weight of the electrode assembly in the battery monomer assembly process is avoided to some extent, the cover plate and the insulating piece are separated, the tab of the electrode assembly is easily pulled and cracked, the performance of the battery monomer is affected to some extent, and the working performance of the battery monomer is improved.

[0007] In some embodiments, the first part is a cylinder, and the S=π(D / 2) 2 wherein D is the diameter of the first part, and the unit of D is mm.

[0008] In the technical scheme, the fixing columns are used to stably connect the cover plate and the insulating piece, the cover plate and the insulating piece are separated to some extent, and the working performance of the battery monomer is improved.

[0009] In some embodiments, the cover plate assembly is configured to meet 4≤n≤22 and D≥2mm.

[0010] In the technical scheme, the number of the fixing columns and the cross-sectional area of the single first part can be set in a suitable range, the forming difficulty of the fixing columns is reduced, the connection strength of the cover plate and the insulating piece is improved by using the multiple fixing columns, the cover plate and the insulating piece are stably connected, and the performance of the battery monomer is ensured to some extent.

[0011] In some embodiments, the cover plate assembly is configured to meet 2.5mm≤D≤5mm.

[0012] In the technical scheme, while ensuring that the fixing columns are used to stably connect the cover plate and the insulating piece, the manufacturing difficulty of the fixing columns is reduced, the occupied space of the fixing columns is reduced, and the design flexibility of the cover plate assembly is improved.

[0013] In some embodiments, 10≤n≤14.

[0014] In the technical scheme, the number of the fixing columns is further optimized, the weight and the manufacturing cost of the insulating piece are reduced, the cross-sectional area of the single first part can be set in a suitable range, and the cover plate and the insulating piece are stably connected by using the multiple fixing columns.

[0015] In some embodiments, the fixing hole comprises a first fixing hole and a second fixing hole which are in communication with each other, the first fixing hole is open towards the insulating piece, the second fixing hole is arranged on the side of the first fixing hole away from the insulating piece, at least part of the second fixing hole has a larger hole diameter than the first fixing hole, the first part is located in the first fixing hole, the second part is located in the second fixing hole, and the fixing column is a plastic piece.

[0016] In the above technical solution, the fixed column can be prevented from falling out of the fixing hole to some extent, so that the fixed column can effectively realize the stable connection of the cover plate and the insulating piece.

[0017] In some embodiments, the fixing column is a plurality of fixing columns, a part of the fixing columns are arranged along the length direction of the insulating piece, and a part of the fixing columns are arranged along the width direction of the insulating piece.

[0018] In the above technical solution, a plurality of fixing columns can be arranged along the length direction and the width direction of the insulating piece, so that the insulating piece can be stably connected with the cover plate through the fixing columns in the length direction and the width direction, further increasing the connection strength of the cover plate and the insulating piece, avoiding the phenomenon that the cover plate and the insulating piece are separated due to the self-weight drop of the electrode assembly during the battery monomer assembly process, and improving the working performance of the battery monomer.

[0019] In some embodiments, the plurality of fixing columns arranged along the length direction of the insulating piece are symmetrically arranged along a straight line where the midpoint along the length direction of the insulating piece is located; and / or, the plurality of fixing columns arranged along the width direction of the insulating piece are symmetrically arranged along a straight line where the midpoint along the width direction of the insulating piece is located.

[0020] In the above technical solution, the stress on each position of the cover plate and the insulating piece in the length direction and / or the width direction can be uniform, further realizing the stable connection of the cover plate and the insulating piece.

[0021] In some embodiments, the insulating piece is provided with two through holes arranged along the length direction thereof, the tab comprises a positive tab and a negative tab, the pole comprises a positive pole and a negative pole, the positive tab and the positive pole are electrically connected through one of the through holes, and the negative tab and the negative pole are electrically connected through the other through hole; in the length direction of the insulating piece, the insulating piece has a first side arranged oppositely, the fixing column is a plurality of fixing columns, at least part of the fixing columns are arranged between the two through holes to form a first fixing column, and at least part of the fixing columns are arranged between the through hole and the first side to form a second fixing column.

[0022] In the above technical solution, the middle part of the insulating piece in the length direction and both ends of the insulating piece in the length direction are stably connected with the cover plate through the fixing columns, further increasing the connection strength of the cover plate and the insulating piece, and avoiding the phenomenon that the cover plate and the insulating piece are separated due to the self-weight drop of the electrode assembly during the assembly of the battery monomer.

[0023] In some embodiments, the end part of the insulating piece in the length direction is provided with a support boss protruding towards the electrode assembly, and the support boss is adapted to support the electrode assembly, wherein the second fixing column is arranged opposite to the support boss in the thickness direction of the cover plate.

[0024] In the above technical solution, on the one hand, the connection strength of the insulating piece and the cover plate at the position of the support boss is further strengthened by the fixing column, the position stability of the insulating piece at the position of the support boss is improved, and the position stability of the support boss is further improved, so that the electrode assembly can be stably supported by the support boss, and the working performance of the support boss is ensured to a certain extent; on the other hand, the connection point of the cover plate and the insulating piece is arranged opposite to the contact point of the support boss and the electrode assembly, the stress path of the battery monomer is optimized, the stress transmission direction of the battery monomer is more definite and concentrated, when the battery monomer is subjected to external force, the force can be transmitted in turn along the fixing column, the support boss and the electrode assembly, so that the stress concentration or dispersion at the connection of the cover plate and the insulating piece is avoided to a certain extent, and the service life of the battery monomer is prolonged.

[0025] In some embodiments, the fixing column further comprises a third fixing column arranged between the through hole and the second fixing column.

[0026] In the above technical solution, the third fixing column is arranged close to the support boss, the connection strength of the insulating piece and the cover plate at the position of the support boss is further strengthened, the position stability of the insulating piece at the position of the support boss is improved, the position stability of the support boss is improved, and the stress path of the battery monomer is optimized, so that the stress transmission direction of the battery monomer is more definite and concentrated.

[0027] In some embodiments, in the length direction of the insulating piece, the insulating piece has a first edge arranged opposite; the minimum distance B between the fixing column and the first edge satisfies: 6mm≤B≤10mm; and / or, in the width direction of the insulating piece, the insulating piece has a second edge arranged opposite; the minimum distance A between the fixing column and the second edge satisfies: 4mm≤A≤6mm.

[0028] In the technical solution, the forming difficulty of the fixing column is reduced, the first side or the second side is prevented from being damaged during the forming of the fixing column, the two ends in the length direction of the insulation piece and the two ends in the width direction of the insulation piece can be effectively fixed by using the fixing column, the position stability of the insulation piece is improved, and the performance of the insulation piece is improved.

[0029] In some embodiments, the insulation piece is provided with a through hole, the tab and the pole are electrically connected through the through hole, the cover plate is provided with a pressure relief mechanism, in the length direction of the insulation piece, a projection of the pressure relief mechanism on the insulation piece is spaced apart from the through hole, the fixing column includes a first fixing column, the first fixing column is arranged between the through hole and the projection of the pressure relief mechanism on the insulation piece, and the first fixing column is arranged staggered with the pressure relief mechanism.

[0030] In the technical solution, the connection strength between the cover plate and the insulation piece around the pressure relief mechanism is strengthened by using the fixing column, the structural strength of the cover plate around the pressure relief mechanism is further strengthened, the pressure relief mechanism can be stably arranged on the cover plate, and the performance of the pressure relief mechanism is ensured to a certain extent.

[0031] In some embodiments, the minimum distance between the projection of the fixing column on the cover plate and the pressure relief mechanism is E, and 50mm≥E≥17mm.

[0032] In the technical solution, the cover plate and the insulation piece are connected by the fixing column, the pressure relief mechanism is prevented from being broken or the connection between the pressure relief mechanism and the cover plate is prevented from being broken to a certain extent, the performance of the pressure relief mechanism is ensured to a certain extent, and the fixing connection between the cover plate and the insulation piece can be realized by using the fixing column.

[0033] In some embodiments, in the length direction of the insulation piece, a plurality of first fixing columns are distributed on opposite sides of the pressure relief mechanism.

[0034] In the technical solution, a plurality of fixing columns are arranged on opposite sides of the pressure relief mechanism, the connection strength between the cover plate and the insulation piece is strengthened, the connection strength between the cover plate and the insulation piece close to the pressure relief mechanism is further strengthened, the structural strength of the cover plate close to the pressure relief mechanism is further strengthened, the structural stability of the cover plate is improved, the position stability of the pressure relief mechanism is improved, and the performance of the pressure relief mechanism is ensured to a certain extent.

[0035] In some embodiments, a plurality of first fixing columns on the same side of the pressure relief mechanism are arranged in the length direction and / or the width direction of the insulation piece.

[0036] In the technical scheme, a plurality of first fixing columns are arranged on opposite sides of the pressure relief mechanism, so as to effectively increase the connection strength between the cover plate and the insulating piece near the pressure relief mechanism.

[0037] In some embodiments, the distance between two adjacent first fixing columns on the same side of the pressure relief mechanism is C, and 50mm≥C≥13mm.

[0038] In the technical scheme, the distance between two adjacent first fixing columns on the same side of the pressure relief mechanism can be reduced to some extent, so as to reduce the manufacturing difficulty of the first fixing columns, avoid the mutual influence of the first fixing columns during the connection process to some extent, reduce the connection difficulty of the cover plate and the insulating piece, improve the performance of the first fixing columns, and effectively realize the stable connection between the cover plate and the insulating piece by using the first fixing columns.

[0039] In some embodiments, a portion of the insulating piece is recessed towards the electrode assembly to define a sink, and a hollow region is arranged in the sink, and the pressure relief mechanism is arranged corresponding to the hollow region.

[0040] In the technical scheme, the hollow region is used to realize the communication between the pressure relief mechanism and the side of the insulating piece away from the cover plate, so as to effectively realize the automatic and rapid pressure relief of the battery monomer by using the pressure relief mechanism when the internal pressure of the battery monomer rises due to overcharge, overdischarge, overcurrent and internal short circuit, and improve the use safety of the battery monomer.

[0041] In some embodiments, the battery monomer further comprises an insulating film wrapped around the outer periphery of the electrode assembly, and the insulating piece is fixedly connected with the insulating film.

[0042] In the technical scheme, the insulating piece is fixedly connected with the electrode assembly, so that the insulating piece can be stably arranged between the cover plate and the electrode assembly, and the working performance of the insulating piece is ensured to some extent.

[0043] In some embodiments, the capacity of the battery monomer is greater than 400Ah.

[0044] In the technical scheme, the endurance of the battery monomer is improved.

[0045] In some embodiments, the size of the shell in the first direction is greater than or equal to 80mm and less than or equal to 300mm, the size of the shell in the second direction is greater than or equal to 68mm and less than or equal to 100mm, the size of the shell in the third direction is greater than or equal to 205mm and less than or equal to 250mm, and the first direction, the second direction and the third direction intersect with each other.

[0046] In the technical solution, the shell can be adapted to the large-size battery cell.

[0047] In some embodiments, the inner periphery of the opening is provided with a recess, and the end of the cover plate is accommodated in the recess and welded with the shell.

[0048] In the technical solution, the cover plate and the shell are fixedly connected.

[0049] In some embodiments, the cover plate overlaps the end of the shell and is welded with the shell.

[0050] In the technical solution, the cover plate and the shell are fixedly connected.

[0051] In a second aspect, the embodiments of the present application provide a battery device, comprising the battery cell.

[0052] In the technical solution, the working performance of the battery device can be improved by using the battery cell.

[0053] In a third aspect, the embodiments of the present application provide an energy storage device, comprising a plurality of the battery cells or a plurality of the battery devices, and the battery cells or the battery devices are used for storing or providing electric energy.

[0054] In the technical solution, the working performance of the energy storage device can be improved by using the battery cell or the battery device.

[0055] In a fourth aspect, the embodiments of the present application provide an electric device, comprising the battery cell, the battery device or the energy storage device, and the battery cell or the battery device is used for storing or providing electric energy.

[0056] In the technical solution, the working performance of the electric device can be improved by using the battery cell, the battery device or the energy storage device.

[0057] Additional aspects and advantages of the application will be made apparent by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0059] Figure 1 A schematic diagram of an electric device according to some embodiments of the present application.

[0060] Figure 2 Schematic view of an energy storage device according to some embodiments of the application.

[0061] Figure 3 Schematic view of a battery device according to some embodiments of the application.

[0062] Figure 4 Front view of a battery cell according to some embodiments of the application.

[0063] Figure 5 Exploded view of a battery cell according to some embodiments of the application.

[0064] Figure 6 Schematic view of a cover assembly according to some embodiments of the application.

[0065] Figure 7 Bottom view of a cover assembly according to some embodiments of the application.

[0066] Figure 8 Schematic view of a cover according to some embodiments of the application. Figure 7 Cross-sectional view along the line A-A.

[0067] Figure 9 Schematic view of an insulation according to some embodiments of the application. Figure 8 Close-up view of the middle region I.

[0068] Figure 10 Schematic view of a cover according to some embodiments of the application.

[0069] Figure 11 Bottom view of a cover according to some embodiments of the application.

[0070] Figure 12 Top view of an insulation according to some embodiments of the first aspect of the application.

[0071] Figure 13 Schematic view of an insulation according to some embodiments of the second aspect of the application.

[0072] Figure 14 Schematic view of an insulation cooperating with a fixing post according to some embodiments of the application.

[0073] Figure 15 Schematic view of a battery cell without its housing according to some embodiments of the application.

[0074] Figure 16 Side view of a battery cell without its housing according to some embodiments of the application.

[0075] Figure 17 Front view of a battery cell without its housing according to some embodiments of the application.

[0076] Figure 18 Top view of a battery cell without a housing according to some embodiments of the application.

[0077] Figure 19 Top view of an insulation piece according to some embodiments of the third aspect of the application.

[0078] Figure 20 Top view of an insulation piece according to some embodiments of the fourth aspect of the application.

[0079] Figure 21 Top view of an insulation piece according to some embodiments of the fifth aspect of the application.

[0080] Figure 22 Top view of an insulation piece according to some embodiments of the sixth aspect of the application.

[0081] Figure 23 Top view of an insulation piece according to some embodiments of the seventh aspect of the application.

[0082] Figure 24 Top view of an insulation piece according to some embodiments of the eighth aspect of the application.

[0083] Figure 25 Partial enlarged sectional view of a battery cell according to some embodiments of the application.

[0084] Figure 26 Sectional view of a battery cell according to some embodiments of the application.

[0085] Figure 27 For Figure 26 Partial enlarged view of region II.

[0086] Reference signs:

[0087] 1000, electric device; 100, battery cell; 110, housing; 111, open mouth; 1111, groove; 120, electrode assembly; 121, tab; 122, insulation film; 130, cover plate assembly; 131, cover plate; 1311, fixing hole; 13111, first fixing hole; 13112, second fixing hole; 1312, overlapping protrusion; 132, insulation piece; 1321, fixing column; 13211, first part; 13212, second part; 13213, first fixing column; 13214, second fixing column; 13215, third fixing column; 1322, support boss; 1323, first edge; 1324, second edge; 1325, hollowed region; 1326, sink; 1327, through hole; 140, pole; 150, pressure relief mechanism; 160, first fixing point; 200, battery device; 210, box body; 211, upper box body; 212, lower box body; 300, energy storage device; 400, controller; 500, motor. Detailed Implementation

[0088] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0089] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0090] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0091] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0092] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0093] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0094] “Multiple” appearing in the present application refers to two or more, including two.

[0095] In the present application, the battery cell can be a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and the embodiments of the present application are not limited thereto. At the same time, the battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the embodiments of the present application are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft package battery cell, and the embodiments of the present application are not limited thereto.

[0096] Exemplarily, the battery cell can generally include a shell, an electrode assembly, and an electrolyte, the shell being used to accommodate the electrode assembly and the electrolyte, the shell being provided with at least one positive pole post and at least one negative pole post. The electrode assembly includes one or more, and the electrode assembly is formed by stacking or winding the positive pole tab, the negative pole tab, and the separator film.

[0097] The positive pole tab can generally include a positive pole current collector and a positive pole active material layer, the positive pole active material layer being directly or indirectly coated on the positive pole current collector, and a plurality of positive pole tabs being stacked together and electrically connected to the positive pole post. Exemplarily, the plurality of positive pole tabs stacked together can be directly welded to the positive pole post to form an electrical connection; or the battery cell can further include a positive pole adapter plate, the plurality of positive pole tabs stacked together being welded to one end of the positive pole adapter plate, and the other end of the positive pole adapter plate being welded to the positive pole post, so that the positive pole tabs are electrically connected to the positive pole post.

[0098] The negative pole tab can generally include a negative pole current collector and a negative pole active material layer, the negative pole active material layer being directly or indirectly coated on the negative pole current collector, and a plurality of negative pole tabs being stacked together and electrically connected to the negative pole post. Exemplarily, the plurality of negative pole tabs stacked together can be directly welded to the negative pole post to form an electrical connection; or the battery cell can further include a negative pole adapter plate, the plurality of negative pole tabs stacked together being welded to one end of the negative pole adapter plate, and the other end of the negative pole adapter plate being welded to the negative pole post, so that the negative pole tabs are electrically connected to the negative pole post.

[0099] The material of the separator film is not limited, for example, it can be polypropylene or polyethylene, etc.

[0100] At present, from the development of market situation, the application of battery monomer is more and more widely. Battery monomer is not only applied to energy storage power system such as water, fire, wind and solar power station, but also widely used in electric bicycle, electric motorcycle, electric vehicle and other electric vehicles, military equipment and aerospace and other fields.

[0101] With the continuous expansion of the application field of battery monomer, the demand of its market is also increasing.

[0102] Among them, in order to protect the battery monomer, an insulating piece is usually arranged between the cover plate and the electrode assembly of the battery monomer. The insulating piece can also avoid the phenomenon of battery monomer leakage to a certain extent, improve the safety of battery monomer, and effectively support the end face of the electrode assembly. Because the internal winding core of the electrode assembly is in a slightly compressed state after the electrode assembly is assembled into the shell and the cover plate is welded, and the electrode assembly is also in a vibrating environment during the use process, if the electrode assembly is not bound enough, it will easily affect the service life of the electrode assembly or cause short circuit. Therefore, the end face of the electrode assembly is effectively supported by the insulating piece to reduce the possibility of moving up and down.

[0103] Therefore, the above can also be understood as arranging the insulating piece between the cover plate and the electrode assembly, which is beneficial to improve the safety, stability and service life of the battery monomer, and makes the battery monomer adapt to complex working environment.

[0104] In addition, in order to realize the fixed connection of the cover plate and the insulating piece, hot melting points are usually arranged on the insulating piece and the cover plate except the riveting position of the pole, so as to realize the connection of the insulating piece and the cover plate by hot melting. The specific scheme is that a stepped groove is dug in the cover plate and a fixing column is arranged on the insulating piece. After ultrasonic hot melting, the height of the fixing column is reduced, which fills the groove on the cover plate and forms a stepped cylinder, so as to realize the fixed connection of the cover plate and the insulating piece. In order to ensure the connection strength of the cover plate and the insulating piece, the number of hot melting points is usually multiple.

[0105] However, because the JR (Jellyroll, electrode assembly semi-finished product without welding mechanical part) is heavy, during the production of electrode assembly into the shell assembly to the pre-welding pressing process, the operation personnel is replaced for many times or the personnel rotation is carried out. There is a phenomenon that the JR self weight falls and pulls the insulating piece. The simulation analysis of JR exchange insertion tongue stress is carried out on the insulating piece and the cover plate connected together by hot melting points. The simulation results show that during the JR exchange insertion tongue and the falling of 6mm (simulation of free fall), the impact force of the insulating piece is several times of the JR self weight, which leads to the hot melting points connecting the insulating piece and the cover plate being easily pulled off, that is, the insulating piece and the cover plate are easily separated, and there is a problem of tearing of the pole under tension, which affects the performance of the battery monomer.

[0106] To solve the above problems, the related art usually performs welding of the cover plate and the shell of the battery monomer in an inverted state after the electrode assembly is inverted into the shell, and turns the battery monomer to a normal state after welding, that is, changes the conventional top welding process to a side welding process, but this scheme needs to change the welding equipment of the pull wire and the layout of the factory building greatly, and the cost is high.

[0107] Based on the phenomenon that the hot melting points connecting the insulating piece and the cover plate are easy to be pulled off, the applicant notices that there are two ideas to improve the easy separation of the insulating piece and the cover plate, one is to increase the number of hot melting points of the insulating piece and the cover plate, and the other is to increase the pulling force of a single hot melting point.

[0108] Based on this, in combination with Figures 4-14 , the embodiment of the present application provides a battery monomer 100, which sets the cover plate assembly 130 including a cover plate 131 and an insulating piece 132 to meet: n≥KM / (FS), wherein: n is the number of fixed columns 1321, the fixed columns 1321 are used to fix and connect the cover plate 131 and the insulating piece 132, M is the weight of the electrode assembly 120, the unit of M is N, the value range of M is 50N≤M≤120N, S is the cross-sectional area of a single first part 13211, the unit of S is mm 2 , the first part 13211 is located in the fixed hole 1311 on the cover plate 131, the value range of K is 5≤K≤9, K can be understood as the multiple of the gravity of the electrode assembly 120 relative to the weight of the electrode assembly 120 when the electrode assembly 120 is exchanged in the process of the electrode assembly 120 in the assembly process of the battery monomer 100, the unit of F is N / mm 2 , the value range of F is 15N / mm 2 ≤F≤25N / mm 2 , F can be understood as the maximum pulling force that a single first part 13211 unit area can bear.

[0109] Therefore, FS can be understood as the maximum tensile force that the single first part 13211 can withstand, KM can be understood as the gravity impact that the electrode assembly 120 itself suffers during the assembly process of the battery monomer 100, and the formula n≥KM / (FS) can be converted into (FS)n≥KM, that is, the cover plate assembly 130 satisfies: the maximum tensile force that the at least one or more fixing columns 1321 can withstand is greater than or equal to the gravity impact that the electrode assembly 120 itself suffers during the assembly process of the battery monomer 100, that is, avoiding that the gravity impact that the electrode assembly 120 itself suffers during the assembly process of the battery monomer 100 is greater than the tensile force that the fixing column 1321 can withstand, so as to avoid that the fixing column 1321 is broken due to the large gravity impact that the electrode assembly 120 itself suffers during the assembly process of the battery monomer 100, and the stable connection of the cover plate 131 and the insulating piece 132 by the fixing column 1321 is realized.

[0110] It can also be understood that by setting the cover plate assembly 130 to satisfy n≥KM / (FS), the fixing column 1321 for fixing and connecting the cover plate 131 and the insulating piece 132 can withstand the tensile force of the electrode assembly 120 due to the self-weight drop, avoiding that the fixing column 1321 is pulled off when the electrode assembly 120 drops due to the self-weight, so that the stable connection of the cover plate 131 and the insulating piece 132 by the fixing column 1321 is realized, the problem that the fixing column 1321 for connecting the cover plate 131 and the insulating piece 132 is pulled off due to the impact and pulling of the insulating piece 132 by the electrode assembly 120 due to the self-weight drop during the plug-in tongue exchange process, and the problem that the cover plate 131 and the insulating piece 132 are separated are solved, and the phenomenon that the tab 121 of the electrode assembly 120 is pulled and cracked is avoided, which to some extent avoids affecting the performance of the battery monomer 100, so as to improve the working performance of the battery monomer 100.

[0111] Meanwhile, the above setting can also avoid the equipment modification cost and production capacity loss cost caused by changing the pulling line equipment and the welding process, and reduce the cost.

[0112] The embodiment of the application also provides a battery device 200 comprising the above battery monomer 100, as shown in Figure 3 The battery device 200 refers to a single physical module comprising a plurality of battery monomers 100 to provide higher voltage and capacity. For example, the battery device 200 mentioned in the application can comprise one or more battery packs for providing voltage and capacity. The battery pack can comprise a plurality of battery monomers 100, and the plurality of battery monomers 100 are connected in series, in parallel or in mixed connection through a busbar component.

[0113] In some embodiments, a battery pack is generally formed by arranging a plurality of battery cells 100. As an example, a battery pack can be a battery module formed by arranging and fixing a plurality of battery cells 100 into one independent module. As an example, a battery module can be formed by bundling a plurality of battery cells 100 by a cable tie.

[0114] In some embodiments, as shown in FIG. 2, the battery device 200 generally includes a box 210 for packaging one or more battery packs, which can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cells 100 to some extent; of course, the battery device 200 can also not include the box 210. Figure 3

[0115] In a specific example, the battery device 200 can be understood as a battery pack.

[0116] In some embodiments, as shown in FIG. 2, the battery device 200 includes the battery cells 100 and the box 210, and the battery cells 100 are arranged in the box 210. In this way, the box 210 can support and protect the battery cells 100, which can improve the structural stability of the battery cells 100, prolong the service life of the battery cells 100, and improve the safety of the battery cells 100. Figure 3

[0117] In some embodiments, as shown in FIG. 2, the box 210 can include an upper box 211 and a lower box 212, and the upper box 211 and the lower box 212 are overlapped with each other, and the upper box 211 and the lower box 212 jointly define a receiving cavity for accommodating the battery cells 100, so as to reduce the forming difficulty of the box 210, thereby facilitating the arrangement of the battery cells 100 in the box 210.

[0118] In some embodiments, as shown in FIG. 2, the box 210 can include an upper box 211 and a lower box 212, and the upper box 211 and the lower box 212 are overlapped with each other, and the upper box 211 and the lower box 212 jointly define a receiving cavity for accommodating the battery cells 100, so as to reduce the forming difficulty of the box 210, thereby facilitating the arrangement of the battery cells 100 in the box 210. Figure 3 In some embodiments, as shown in FIG. 2, the box 210 can include an upper box 211 and a lower box 212, and the upper box 211 and the lower box 212 are overlapped with each other, and the upper box 211 and the lower box 212 jointly define a receiving cavity for accommodating the battery cells 100, so as to reduce the forming difficulty of the box 210, thereby facilitating the arrangement of the battery cells 100 in the box 210.

[0119] Figure 3 In some embodiments, as shown in FIG. 2, the box 210 can include an upper box 211 and a lower box 212, and the upper box 211 and the lower box 212 are overlapped with each other, and the upper box 211 and the lower box 212 jointly define a receiving cavity for accommodating the battery cells 100, so as to reduce the forming difficulty of the box 210, thereby facilitating the arrangement of the battery cells 100 in the box 210.

[0120] ​​​It should be noted that the box 210 formed by the upper box body 211 and the lower box body 212 can be in various shapes, such as a cylinder, a cube or a cuboid, etc.; and the battery cell 100 can be in various shapes, such as a cylinder, a square, etc.

[0121] The embodiments of the present application further provide an energy storage device 300 (as shown in Figure 2 The battery cell 100 or the battery device 200 is included in plurality, and is used to store or provide electric energy, so as to ensure the performance of the energy storage device 300 to some extent, so that the energy storage device can effectively store electric energy and release the electric energy to supply the power system when needed.

[0122] In some embodiments, the energy storage device 300 can be used in a pumped storage power station, a wind power system, a solar power system, a mobile power system or a temporary power supply system, etc. The energy storage device 300 can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device 300 can store electric energy at a low electricity consumption valley, and provide electric energy for related users or electric equipment at a high electricity consumption peak.

[0123] The embodiments of the present application further provide a power consumption device 1000 (as shown in Figure 1 The battery cell 100 or the battery device 200 is used to store or provide electric energy, so as to provide electric energy to the power consumption device 1000 and ensure the working performance of the power consumption device 1000 to some extent.

[0124] Here, the power consumption device 1000 can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc.

[0125] The electric toy can include a fixed or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy and an electric plane toy, etc.; the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0126] The following embodiments take the power consumption device 1000 as a vehicle for example to introduce the structure of the power consumption device 1000 in detail.

[0127] Please refer to Figure 1 , Figure 1The electric device 1000 is shown as a vehicle. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle is provided with the battery device 200, which can be arranged at the bottom, head, or tail of the vehicle. The battery device 200 can be used for power supply of the vehicle, for example, the battery device 200 can be used as the operating power supply of the vehicle.

[0128] In some embodiments, as shown in Figure 1 The vehicle can further include a controller 400 and a motor 500, and the controller 400 is used to control the battery device 200 to supply power to the motor 500, for example, for the working power demand of the vehicle during starting, navigation, and driving.

[0129] In some embodiments of the present application, the battery device 200 can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle 10, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0130] The battery cell 100 according to the embodiments of the present application is described below with reference to the accompanying drawings of the specification.

[0131] As shown in Figure 4 and Figure 5 The battery cell 100 includes a shell 110, an electrode assembly 120, and a cover plate assembly 130.

[0132] As shown in Figure 5 The end of the shell 110 is provided with an open port 111. The open port 111 is used to realize the mutual communication between the inside and outside of the shell 110, to a certain extent, to reduce the assembly difficulty of the shell 110 and the electrode assembly 120, thereby reducing the assembly difficulty of the battery cell 100 and improving the assembly efficiency.

[0133] As shown in Figure 4 and Figure 5 The electrode assembly 120 is arranged in the shell 110, and the electrode assembly 120 includes a tab 121.

[0134] By arranging the electrode assembly 120 in the shell 110, the shell 110 can be used to protect the electrode assembly 120, prolong the service life of the electrode assembly 120, and improve the use safety of the electrode assembly 120.

[0135] Therefore, by arranging the open port 111 at the end of the shell 110, it can also be understood that the electrode assembly 120 is arranged in the shell 110.

[0136] In a specific example, the electrode assembly 120 is arranged in the shell 110 through the open port 111, thereby reducing the assembly difficulty of the electrode assembly 120 and the shell 110.

[0137] In addition, by arranging the tab 121 on the electrode assembly 120, the current is led out from the inside of the battery by the tab 121 to form a loop, so as to facilitate the charging and discharging function of the battery monomer 100, and reduce the difficulty of use of the battery monomer 100.

[0138] In combination Figures 4-13 As shown, the cover plate assembly 130 is arranged on the shell 110 to cover the open mouth 111, and the cover plate assembly 130 includes a cover plate 131 and an insulating piece 132, the cover plate 131 is provided with a pole 140 electrically connected with the tab 121, and the insulating piece 132 is located between the cover plate 131 and the electrode assembly 120, the cover plate 131 is provided with at least one fixing hole 1311, and the insulating piece 132 is provided with at least one fixing column 1321 matched with the fixing hole 1311 to fixedly connect the cover plate 131 and the insulating piece 132. That is, the cover plate 131 and the insulating piece 132 are fixedly connected through the cooperation of the at least one fixing hole 1311 on the cover plate 131 and the at least one fixing column 1321 on the insulating piece 132, which not only reduces the connection difficulty of the cover plate 131 and the insulating piece 132, but also improves the connection strength of the cover plate 131 and the insulating piece 132.

[0139] Among them, by setting the cover plate assembly 130 to include the cover plate 131 and the insulating piece 132, and setting the insulating piece 132 to be located between the cover plate 131 and the electrode assembly 120, the first aspect can protect the electrode assembly 120 by the insulating piece 132, prolong the service life of the electrode assembly 120, and improve the use safety of the electrode assembly 120, the second aspect can also avoid the phenomenon of battery monomer 100 leakage to a certain extent, improve the use safety of the battery monomer 100, the third aspect can improve the insulation performance of the cover plate 131 and the electrode assembly 120, prevent the battery monomer 100 from failing due to the corrosion of the electrolyte to the cover plate 131, and improve the performance of the battery monomer 100; the fourth aspect facilitates effective support to the end face of the electrode assembly 120 to reduce the possibility of the electrode assembly 120 moving up and down.

[0140] In some embodiments, the insulating piece 132 is made of plastic material, which not only reduces the manufacturing cost of the insulating piece 132, but also improves the insulation performance of the insulating piece 132, to a certain extent, to ensure the working performance of the insulating piece 132.

[0141] At the same time, by arranging the pole 140 electrically connected with the tab 121 on the cover plate 131, the current is led out from the inside of the battery by the cooperation of the pole 140 and the tab 121, so as to facilitate the charging and discharging function of the battery monomer 100.

[0142] Among them, in combination Figure 13 And Figure 14As shown, the fixing column 1321 comprises a first part 13211 and a second part 13212 connected with each other, the first part 13211 is located in the fixing hole 1311, and the second part 13212 is located on the side of the first part 13211 away from the insulation piece 132, and the cross-sectional area of the second part 13212 is larger than that of the first part 13211. In order to limit the displacement of the first part 13211 by using the second part 13212, and avoid the first part 13211 from being pulled out of the fixing hole 1311, so as to facilitate the stable connection of the cover plate 131 and the insulation piece 132 by using the cooperation of the fixing hole 1311 and the fixing column 1321.

[0143] In a specific example, the fixing column 1321 on the insulation piece 132 is arranged opposite to the fixing hole 1311 on the cover plate 131, during the assembly of the cover plate assembly 130, the fixing column 1321 is arranged in the fixing hole 1311, and the first part 13211 of the fixing column 1321 is located in the fixing hole 1311. By ultrasonic hot melting the fixing column 1321, the height of the fixing column 1321 is reduced, and the second part 13212 is formed on the side of the first part 13211 away from the insulation piece 132, the second part 13212 cooperates with the fixing hole 1311, thereby realizing the fixed connection of the cover plate 131 and the insulation piece 132, and to a certain extent, ensuring the connection strength of the cover plate 131 and the insulation piece 132.

[0144] Meanwhile, by hot melting the fixing column 1321, the fixing column 1321 can also be melted in the fixing hole 1311, that is, the cover plate 131 and the insulation piece 132 are integrated, reducing the riveting process, simplifying the manufacturing process of the battery monomer 100 and reducing the production cost of the battery monomer 100, while reducing the quality of the battery monomer 100, and without affecting the basic function of the battery monomer 100, so that the structure of the cover plate assembly 130 is more compact, the space utilization rate of the battery monomer 100 is improved, and the internal of the battery monomer 100 can be placed in a larger electrode assembly 120, thereby improving the capacity of the battery monomer 100.

[0145] The cover plate assembly 130 is configured to satisfy: n≥KM / (FS), wherein n is the number of the fixing column 1321; M is the weight of the electrode assembly 120, the unit of M is N, and the value range of M is 50N≤M≤120N; S is the cross-sectional area of a single first part 13211, the unit of S is mm 2 ; the value range of K is 5≤K≤9; the unit of F is N / mm 2 , and the value range of F is 15N / mm 2 ≤F≤25N / mm 2 .

[0146] It should be noted that, in the battery monomer 100, in order to reduce the manufacturing difficulty of the fixing column 1321 and enable the fixing column 1321 to withstand a certain degree of tension, the maximum distance of any two points in the cross-sectional area of the first part 13211 of the fixing column 1321 is generally set to 2.5-5 mm. Through multiple tension tests (the specific process of the tension test can be referred to below) on the first part 13211 of 2.5-5 mm, it is concluded that the maximum tension value that a single fixing column 1321 can withstand per unit area of the first part 13211 is generally 15-25 N / mm 2 2 Therefore, in the above formula, F can be understood as the maximum tension value that a single first part 13211 can withstand per unit area, FS can be understood as the product of the maximum tension value that a single first part 13211 can withstand per unit area and the cross-sectional area of a single first part 13211, that is, the maximum tension value that a single first part 13211 can withstand; K mentioned above can be understood as the multiple of the gravity of the electrode assembly 120 relative to the self-weight of the electrode assembly 120 when the electrode assembly 120 is exchanged with the plug during the assembly process of the battery monomer 100; M is the weight of the electrode assembly 120, but does not include the weight of the tab 121 and the electrolyte. When the battery monomer 100 includes multiple electrode assemblies 120, M is the sum of the weights of the multiple electrode assemblies 120.

[0147] ​That is, when the fixed connection of the cover plate 131 and the insulating piece 132 is formed by matching the fixing hole 1311 on the cover plate 131 and the fixing column 1321 on the insulating piece 132, the number n of the fixing columns 1321, the weight M of the electrode assembly 120, and the tension borne by a single fixing column 1321 satisfy: (FS)n≥KM. When the fixing column 1321 connecting the cover plate 131 and the insulating piece 132 is one, the tension borne by the single fixing column 1321 is greater than or equal to the gravity impact of the electrode assembly 120 itself during the assembly process of the battery monomer 100, and when the fixing column 1321 connecting the cover plate 131 and the insulating piece 132 is multiple, the tension borne by the multiple fixing columns 1321 is greater than or equal to the gravity impact of the electrode assembly 120 itself during the assembly process of the battery monomer 100, thereby avoiding the fracture of the fixing column 1321 due to the large gravity impact of the electrode assembly 120 itself during the assembly process of the battery monomer 100, enabling the stable connection of the cover plate 131 and the insulating piece 132 by the fixing column 1321, avoiding the separation of the cover plate 131 and the insulating piece 132, solving the problem that the cover plate 131 and the insulating piece 132 are separated due to the large self-weight of the electrode assembly 120, the electrode assembly 120 is impacted and pulled by the self-weight during the plug-in tongue exchange process, the fixing column 1321 connecting the cover plate 131 and the insulating piece 132 is pulled off, and the cover plate 131 and the insulating piece 132 are separated, and avoiding the phenomenon that the tab 121 of the electrode assembly 120 is pulled and cracked under stress, to a certain extent, avoiding the influence on the performance of the battery monomer 100, thereby improving the working performance of the battery monomer 100.

[0148] That is, the fixing column 1321 of the present application not only enables the fixed connection of the cover plate 131 and the insulating piece 132, but also avoids the phenomenon that the electrode assembly 120 is pulled off due to the self-weight, thereby avoiding the separation of the cover plate 131 and the insulating piece 132 during the assembly process of the battery monomer 100 to a certain extent, and ensuring the working performance of the battery monomer 100 to a certain extent.

[0149] Meanwhile, by setting the number n of the fixing columns 1321, the weight M of the electrode assembly 120, and the tension borne by a single fixing column 1321, the problem of the separation of the cover plate 131 and the insulating piece 132 due to the self-weight of the electrode assembly 120 is solved, the change of the pulling line equipment and the welding process is avoided, thereby avoiding the equipment modification cost and the production capacity loss cost, and reducing the improvement cost.

[0150] It should be noted that the weight M of the electrode assembly 120 can be obtained by the following measurement method:

[0151] First, the cover plate assembly 130 and the electrode assembly 120 are peeled off from the shell 110, when the outer surface of the electrode assembly 120 is provided with the insulating film 122, the insulating film 122 is torn off, and the cover plate assembly 130 and the electrode assembly 120 are separated, and then the tab 121 (including the positive electrode tab and the negative electrode tab) of the electrode assembly 120 is cut off, and then the remaining electrode assembly 120 is spread out, the positive electrode tab, the negative electrode tab and the separator are distinguished, the positive electrode tab and the separator are rolled up and put into a polyurethane bag separately, the steel gasket hole is put into the bottom of the centrifugal tube with the bottom opening, the negative electrode tab is rolled up into a cylindrical shape, the diameter of which is slightly smaller than the inner diameter of the centrifugal tube, and then the centrifugal tube is put into the sample bag; the centrifugal tube is put into the centrifugal machine (model TDL-5-A), the centrifugal speed is set to 3200 rpm, and the time is 30 min, then the positive electrode tab and the separator after centrifugation are put into the drying oven, the baking temperature is 105 degrees, and the baking time is 10 hours, and finally the weight of the baked separator, the positive electrode tab and the negative electrode tab after centrifugation is weighed respectively, and the sum is the weight of the electrode assembly 120.

[0152] However, it should be noted that the weight of the electrode assembly 120 measured by the above measurement method is in kg, and the weight measured is multiplied by 9.8N~10N to obtain the weight M of the electrode assembly 120 of the present application.

[0153] In the present application, the weight M of the electrode assembly 120 is set to 50N≤M≤120N, which can improve the working performance of the electrode assembly 120 while avoiding excessive weight of the electrode assembly 120, thereby avoiding excessive weight of the battery monomer 100, and avoiding the increase of the overall weight of the electric device 1000 due to the excessive weight of the battery monomer 100, and improving the stability and safety of the electric device 1000.

[0154] It should be noted that when the fixing column 1321 connecting the cover plate 131 and the insulating piece 132 is one, the maximum tensile force that can be borne by one fixing column 1321 can be understood as the maximum tensile force that can be borne by the insulating piece 132; when the fixing column 1321 connecting the cover plate 131 and the insulating piece 132 is multiple and the cross-sectional area of the first part 13211 of the multiple fixing columns 1321 is consistent, the maximum tensile force that can be borne by the multiple fixing columns 1321 can be understood as the maximum tensile force that can be borne by the insulating piece 132; when the fixing column 1321 connecting the cover plate 131 and the insulating piece 132 is multiple but the cross-sectional area of the first part 13211 of the multiple fixing columns 1321 is inconsistent, the maximum tensile force that can be borne by the first part 13211 with the largest cross-sectional area can be understood as the maximum tensile force that can be borne by the insulating piece 132, and the maximum tensile force that can be borne by the insulating piece 132 can be obtained by the following measurement method:

[0155] First, prepare the test piece and the push-pull force testing machine. The push-pull force testing machine is an EMPDA instrument. The EMPDA instrument has a clamp. The test piece includes the assembled cover plate 131 and the insulating piece 132. The clamp includes a bottom shell and an upper cover. The bottom shell has a top opening accommodating cavity. The test piece is assembled in the accommodating cavity. The upper cover is covered on the opening. The cover plate 131 is fixedly connected with the bottom shell. The insulating piece 132 is fixedly connected with the upper cover through a plurality of screws. The plurality of screws arranged at intervals in the length direction of the upper cover are symmetrically arranged along the straight line where the midpoint in the length direction of the upper cover is located. The plurality of screws arranged at intervals in the width direction of the upper cover are symmetrically arranged along the straight line where the midpoint in the width direction of the upper cover is located. Not only the test piece is stably installed into the clamp by the screws, but also the stress on each position of the insulating piece 132 can be ensured uniform in the process of locking the insulating piece 132, thereby improving the accuracy of detection. After the test piece is locked, the test piece in the clamp is placed on the joint of the push-pull force testing machine. Finally, the computer switch and the push-pull force testing machine switch are turned on. The software setting interface of the EMPDA instrument is entered. The static experiment is clicked. The upper cover is pulled away from the bottom shell. The insulating piece 132 is pulled away from the cover plate 131. The moving speed is controlled to be 5 mm / min. The target load is controlled to be 2000 N. That is, the pulling force of the insulating piece 132 is gradually increased from 0 N to 2000 N in the process of pulling the insulating piece 132. Whether the fixed column 1321 between the cover plate 131 and the insulating piece 132 is pulled off is detected in the process of increasing the force. When the fixed column 1321 is pulled off, the pulling force value of the load is recorded. The pulling force value is the maximum pulling force value that the insulating piece 132 can bear.

[0156] When the fixed column 1321 connecting the cover plate 131 and the insulating piece 132 is one, the maximum pulling force value that the insulating piece 132 can bear is the maximum pulling force value that the single first part 13211 can bear. When the fixed column 1321 connecting the cover plate 131 and the insulating piece 132 is a plurality and the cross-sectional areas of the first parts 13211 of the plurality of fixed columns 1321 are consistent, the maximum pulling force value that the insulating piece 132 can bear is divided by the number n of the fixed columns 1321 to obtain the maximum pulling force value that the single first part 13211 can bear. When the fixed column 1321 connecting the cover plate 131 and the insulating piece 132 is a plurality but the cross-sectional areas of the first parts 13211 of the plurality of fixed columns 1321 are inconsistent, the maximum pulling force value that the insulating piece 132 can bear is the maximum pulling force value that the first part 13211 with the largest cross-sectional area can bear.

[0157] It should be noted that when the fixing columns 1321 connecting the cover plate 131 and the insulating piece 132 are multiple and the cross-sectional areas of the first portions 13211 of the multiple fixing columns 1321 are consistent, F can be understood as the maximum tensile force value that can be borne by the unit area of any first portion 13211, and n is the sum of the number of the multiple fixing columns 1321; when the fixing columns 1321 connecting the cover plate 131 and the insulating piece 132 are multiple and the cross-sectional areas of the first portions 13211 of the multiple fixing columns 1321 are inconsistent, F can be understood as the maximum tensile force value that can be borne by the unit area of the first portion 13211 with the largest cross-sectional area, and n is a constant, n = 1.

[0158] In some embodiments, when the fixing columns 1321 connecting the cover plate 131 and the insulating piece 132 are multiple, the cross-sectional areas of the first portions 13211 of the multiple fixing columns 1321 are consistent, which not only can reduce the manufacturing difficulty of the multiple fixing columns 1321, but also facilitates the stable connection of the cover plate 131 and the insulating piece 132 by using the multiple fixing columns 1321.

[0159] In addition, after the maximum tensile force value that can be borne by a single first portion 13211 is determined, the maximum tensile force value that can be borne by the single first portion 13211 is divided by the cross-sectional area of the single first portion 13211, and the maximum tensile force value that can be borne by the unit area of the first portion 13211 of a single fixing column 1321 is obtained, that is, F is obtained. It can also be understood that the present application performs multiple tensile tests on the first portion 13211 of 2.5 mm to 5 mm by the above test method, and the maximum tensile force value that can be borne by the unit area of the first portion 13211 of a single fixing column 1321 is generally 15 N / mm 2 ~25N / mm 2 .

[0160] It can be known from the above structure that the battery monomer 100 of the embodiment of the present application realizes the fixed connection of the cover plate 131 and the insulating piece 132 by arranging the fixing holes 1311 on the cover plate 131 and arranging the fixing columns 1321 cooperating with the fixing holes 1311 on the insulating piece 132, which is beneficial to reduce the connection difficulty of the cover plate 131 and the insulating piece 132, and can also improve the connection strength of the cover plate 131 and the insulating piece 132.

[0161] Meanwhile, by setting the number n of the fixing columns 1321, the weight M of the electrode assembly 120, and the tensile force that can be borne by a single fixing column 1321 to satisfy n≥KM / (FS), the stable connection of the cover plate 131 and the insulating member 132 by the fixing columns 1321 is achieved, and to some extent, the phenomenon of separation of the cover plate 131 and the insulating member 132 due to the weight of the electrode assembly 120 during the assembly of the battery cell 100 is avoided, thereby solving the problem of separation of the cover plate 131 and the insulating member 132 due to the excessive weight of the electrode assembly 120, the impact and pulling of the insulating member 132 by the electrode assembly 120 due to the weight during the plug-in exchange, the breakage of the fixing columns 1321 connecting the cover plate 131 and the insulating member 132, and further the separation of the cover plate 131 and the insulating member 132, and the phenomenon of cracking of the tab 121 of the electrode assembly 120 due to the stress is avoided, to some extent, the performance of the battery cell 100 is affected, and thus the working performance of the battery cell 100 is improved.

[0162] It can be understood that, compared with the prior art, the cover plate 131 and the insulating member 132 are fixedly connected by the fixing columns 1321, and the number n of the fixing columns 1321, the weight M of the electrode assembly 120, and the tensile force that can be borne by a single fixing column 1321 are set to satisfy n≥KM / (FS), to achieve the stable connection of the cover plate 131 and the insulating member 132, to some extent, the phenomenon of breakage of the fixing columns 1321 due to the weight of the electrode assembly 120 during the assembly of the battery cell 100 is avoided, and further the separation of the cover plate 131 and the insulating member 132 during the assembly of the battery cell 100 is avoided, the stable connection of the cover plate 131 and the insulating member 132 is achieved, and the tab 121 of the electrode assembly 120 is also avoided from being cracked, to some extent, the performance of the battery cell 100 is affected, and thus the working performance of the battery cell 100 is improved.

[0163] In some embodiments, the fixing column 1321 is a plastic part. While having a certain structural strength, the fixing column 1321 can also reduce the difficulty of forming the fixing column 1321, thereby facilitating the setting of the fixing column 1321 to have the first part 13211 and the second part 13212 connected to each other, so as to facilitate the cooperation and connection of the cover plate 131 and the insulating member 132 by the fixing column 1321, and reduce the difficulty of cooperation and connection of the cover plate 131 and the insulating member 132.

[0164] Therefore, in the above formula, F can be understood as the maximum tensile force value that can be borne by a unit area of a single first part 13211 formed as a plastic part.

[0165] In some embodiments, the fixing column 1321 is made of PP (Polypropylene), which can reduce the manufacturing cost of the fixing column 1321 while forming the fixing column 1321 as a plastic part.

[0166] Of course, in other embodiments, the fixing column 1321 can also be made of PE (Polyethylene).

[0167] In some embodiments, K = 5, 6, 7, 8, or 9, etc.

[0168] In some embodiments, M = 50N, 60N, 70N, 80N, 90N, 100N, 110N, or 120N, etc.

[0169] In some embodiments, F = 15N / mm 2 , 16N / mm 2 , 17N / mm 2 , 18N / mm 2 , 19N / mm 2 , 20N / mm 2 , 21N / mm 2 , 22N / mm 2 , 23N / mm 2 , 24N / mm 2 , or 25N / mm 2 .

[0170] In some embodiments, in combination with the descriptions in Figure 14 and Figure 15 , the first part 13211 is cylindrical, S = π(D / 2) 2 , where D is the diameter of the first part 13211, and the unit of D is mm. It can be understood here that when the first part 13211 is cylindrical, the cover plate assembly 130 is configured to satisfy: ; that is, n ≥ 4KM / (FπD 2 ).

[0171] Through the above setting, when the maximum tensile force value that the unit area of the first part 13211 of a single fixing column 1321 can bear is defined as 20N / mm 2 , the above formula n ≥ 4KM / (FπD 2 ) can be converted to n ≥ 4KM / (20πD 2 ), that is, n ≥ KM / (5πD 2 ).

[0172] In summary, when the first part 13211 is cylindrical, the cover plate assembly 130 is configured to satisfy: n ≥ KM / (5πD 2), wherein n is the number of the fixing columns 1321; M is the weight of the electrode assembly 120, the unit of M is N, and the value range of M is 50N≤M≤120N; 5πD 2 is the maximum tensile force that the single first part 13211 can bear; and the value range of K is 5≤K≤9. Through the above settings, the stable connection of the cover plate 131 and the insulating piece 132 can be effectively realized by using the cylindrical fixing columns 1321, the separation of the cover plate 131 and the insulating piece 132 is avoided to a certain extent, and the working performance of the battery monomer 100 is improved.

[0173] Of course, in other embodiments, the first part 13211 is not limited to being formed in a cylindrical shape, that is, the cross-sectional area of the first part 13211 is not limited to being formed in a circular shape, and the cross-sectional area of the first part 13211 can also be formed in a rectangular shape, a square shape, or a hexagonal shape, etc.

[0174] In some embodiments, as shown in Figure 7 , Figure 8 and Figure 9 , the fixing hole 1311 includes a first fixing hole 13111 and a second fixing hole 13112 that are in communication with each other, the first fixing hole 13111 is open toward the insulating piece 132, the second fixing hole 13112 is arranged on the side of the first fixing hole 13111 away from the insulating piece 132, the hole diameter of at least part of the second fixing hole 13112 is greater than the hole diameter of the first fixing hole 13111, the first part 13211 is located in the first fixing hole 13111, and the second part 13212 is located in the second fixing hole 13112. To a certain extent, the fixing column 1321 is prevented from falling out of the fixing hole 1311, so that the stable connection of the cover plate 131 and the insulating piece 132 can be effectively realized by using the fixing column 1321.

[0175] At the same time, by using the fixing column 1321 to replace the traditional riveting process, the manufacturing process of the battery monomer 100 can be simplified, and the overall weight and production cost of the battery monomer 100 can be reduced.

[0176] In some embodiments, the fixing column 1321 is integrally formed with the insulating piece 132. By adopting the integrated design, the assembly efficiency of the battery monomer 100 is improved, and the connection strength of the fixing column 1321 and the insulating piece 132 is improved, so that the fixing column 1321 is prevented from falling off before being heated and fused, and the stable connection of the cover plate 131 and the insulating piece 132 can be effectively realized by using the fixing column 1321.

[0177] Of course, in other embodiments, the fixing column 1321 and the insulating piece 132 can also be formed as separate parts. That is, the fixing column 1321 and the insulating piece 132 are separately processed and formed, and after the fixing column 1321 and the insulating piece 132 are processed, the fixing column 1321 and the insulating piece 132 are bonded, welded, etc., and the fixing column 1321 can also be arranged on the insulating piece 132.

[0178] In some embodiments, the cover plate assembly 130 is configured to satisfy: 4≤n≤22, D≥2mm. It should be noted that in n≥KM / (FS), the number n of the fixing column 1321 is inversely proportional to the cross-sectional area S of the single first part 13211, that is, the number n of the fixing column 1321 is inversely proportional to the diameter D of the first part 13211. When the diameter D of the first part 13211 is small, a larger number of fixing columns 1321 need to be arranged, which increases the difficulty of forming the fixing column 1321. Therefore, the present application sets D to satisfy D≥2mm, which not only improves the pulling force of a single fixing column 1321, but also enables the fixing column 1321 to support an electrode assembly 120 with a larger weight, enhances the compatibility, and to a certain extent, avoids the electrode assembly 120 from being pulled off and broken due to its own weight, improves the performance of the fixing column 1321, so that the fixing column 1321 can be used to stably connect the cover plate 131 and the insulating piece 132, and also avoids arranging a large number of fixing columns 1321 to a certain extent, which reduces the difficulty of forming the fixing column 1321.

[0179] At the same time, when the number n of the fixing column 1321 is large, the weight and the manufacturing cost of the insulating piece 132 will increase, and the manufacturing difficulty of the fixing column 1321 will also increase. When the number n of the fixing column 1321 is small, in order to stably connect the cover plate 131 and the insulating piece 132, the cross-sectional area of the first part 13211 needs to be increased, which increases the manufacturing difficulty of the first part 13211. Therefore, the number n of the fixing column 1321 is set to satisfy: 4≤n≤22, which not only increases the number of the fixing column 1321, but also avoids arranging a large number of fixing columns 1321, and also avoids the cross-sectional area of the first part 13211 being too large, which facilitates the use of multiple fixing columns 1321 to stably connect the cover plate 131 and the insulating piece 132, improves the connection strength of the cover plate 131 and the insulating piece 132, and further stably connects the cover plate 131 and the insulating piece 132, to a certain extent, avoids the separation of the cover plate 131 and the insulating piece 132 due to the weight of the electrode assembly 120, and improves the working performance of the insulating piece 132.

[0180] That is, by setting the cover plate assembly 130 to satisfy: 4≤n≤22, D≥2mm. While reducing the manufacturing difficulty of the fixing column 1321, it is also beneficial to improve the connection strength of the cover plate 131 and the insulating piece 132, realize the stable connection of the cover plate 131 and the insulating piece 132, and to some extent, ensure the performance of the battery monomer 100.

[0181] Specifically, the number of fixing columns 1321 is n=4, 6, 8, 10, 12, 14, 16, 18, 20, or 22, etc.; the diameter of the first part 13211 is D=2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, etc.

[0182] When the number of fixing columns 1321 is n=8, the arrangement mode of the 8 fixing columns 1321 can refer to Figure 13 When the number of fixing columns 1321 is n=10, the arrangement mode of the 10 fixing columns 1321 can refer to Figure 19 When the number of fixing columns 1321 is n=12, the arrangement mode of the 12 fixing columns 1321 can refer to Figure 20 When the number of fixing columns 1321 is n=14, the arrangement mode of the 14 fixing columns 1321 can refer to Figure 21 When the number of fixing columns 1321 is n=16, the arrangement mode of the 16 fixing columns 1321 can refer to Figure 12 or Figure 22 When the number of fixing columns 1321 is n=18, the arrangement mode of the 18 fixing columns 1321 can refer to Figure 23 When the number of fixing columns 1321 is n=20, the arrangement mode of the 20 fixing columns 1321 can refer to Figure 24 .

[0183] In some embodiments, 10≤n≤14. To further optimize the number of fixing columns 1321, while reducing the weight and manufacturing cost of the insulating piece 132, the cross-sectional area of a single first part 13211 can be set within a suitable range, ensuring that the cover plate 131 and the insulating piece 132 can be fixedly connected by cooperating with multiple fixing columns 1321, improving the connection strength of the cover plate 131 and the insulating piece 132, further realizing the stable connection of the cover plate 131 and the insulating piece 132, to some extent, avoiding the separation of the cover plate 131 and the insulating piece 132 due to the self-weight of the electrode assembly 120, and thus improving the working performance of the insulating piece 132.

[0184] In some embodiments, the cover plate assembly 130 is configured to satisfy: 2.5mm≤D≤5mm. Wherein, when the diameter D of the first part 13211 is smaller, in order to avoid the first part 13211 being pulled off, it is usually necessary to set a larger number of fixing columns 1321, which reduces the manufacturing difficulty of the plurality of fixing columns 1321; when the diameter D of the first part 13211 is larger, not only the manufacturing difficulty of the fixing column 1321 is increased, but also the fixing column 1321 occupies a larger space, which affects the design flexibility of the cover plate assembly 130.

[0185] Based on this, the diameter D of the first part 13211 is set to satisfy: 2.5mm≤D≤5mm, which not only ensures that the cover plate 131 and the insulating piece 132 can be stably connected by the fixing column 1321, but also reduces the manufacturing difficulty of the fixing column 1321 and reduces the occupied space of a single fixing column 1321, which is beneficial to improve the design flexibility of the cover plate assembly 130.

[0186] Optionally, the diameter D of the first part 13211 is 2.5mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0187] It should be noted that the heat melting point tension test of the insulating piece 132 of the cover plate assembly 130 with different production batches of D=2.5mm and D=4mm is carried out, when D=2.5mm, from Table 1 (Table 1 is a tension data table of the fixing column 1321 tension test of the cover plate assembly 130 when D=2.5mm), the average value mean of the tension that can be borne by the heat melting point of the plurality of insulating pieces 132 is 118N, the tension standard deviation σ is 18N, and the lower limit of the tension is mean-3σ=64N; when D=4mm, from Table 2 (Table 2 is a tension data table of the fixing column 1321 tension test of the cover plate assembly 130 when D=4mm), the average value mean of the tension that can be borne by the heat melting point of the plurality of insulating pieces 132 is 158N, the tension standard deviation σ is 26N, and the lower limit of the tension is mean-3σ=78N. That is, compared with the fixing column 1321 of D=2.5mm, the tension that can be borne by the fixing column 1321 of D=4mm is obviously improved, which is beneficial to reduce the number of the fixing column 1321 and reduce the forming difficulty of the fixing column 1321.

[0188]

[0189] Based on this, in a specific example, the diameter D of the first part 13211 is selected as 4 mm to effectively increase the pulling force of the fixing column 1321, to a certain extent, avoid the electrode assembly 120 from falling due to its own weight and being pulled apart from the fixing column 1321, improve the performance of the fixing column 1321, and thus realize the stable connection of the insulating piece 132 and the cover plate 131, while also reducing the number of fixing columns 1321.

[0190] In some embodiments, as shown in Figure 12 , the fixing column 1321 is a plurality of fixing columns, and a part of the fixing columns 1321 are arranged along the length direction of the insulating piece 132, and a part of the fixing columns 1321 are arranged along the width direction of the insulating piece 132. Here, the length direction of the insulating piece 132 can be understood as the X direction shown in Figure 12 , and the width direction of the insulating piece 132 can be understood as the Y direction shown in Figure 12 . Here, it can also be understood that, along the length direction of the insulating piece 132, the fixing column 1321 has at least two, and correspondingly, along the width direction of the insulating piece 132, the fixing column 1321 also has at least two, so that the insulating piece 132 can be stably connected with the cover plate 131 through the fixing column 1321 in the length direction and in the width direction, further increasing the connection strength of the cover plate 131 and the insulating piece 132, avoiding the phenomenon that the cover plate 131 and the insulating piece 132 are separated due to the falling of the electrode assembly 120 under its own weight during the assembly of the battery monomer 100, and improving the working performance of the battery monomer 100.

[0191] In some embodiments, as shown in Figure 12 , the plurality of fixing columns 1321 arranged along the length direction of the insulating piece 132 are symmetrically arranged along the straight line where the midpoint in the length direction of the insulating piece 132 is located. In this way, when the plurality of fixing columns 1321 in the length direction of the insulating piece 132 are used to fixedly connect the cover plate 131 and the insulating piece 132, the forces on each position of the cover plate 131 and the insulating piece 132 in the length direction are uniform, which is conducive to realizing the stable connection of the cover plate 131 and the insulating piece 132.

[0192] In some embodiments, as shown in Figure 12 , the plurality of fixing columns 1321 arranged along the width direction of the insulating piece 132 are symmetrically arranged along the straight line where the midpoint in the width direction of the insulating piece 132 is located. In this way, when the plurality of fixing columns 1321 in the width direction of the insulating piece 132 are used to fixedly connect the cover plate 131 and the insulating piece 132, the forces on each position of the cover plate 131 and the insulating piece 132 in the width direction are uniform, which is conducive to realizing the stable connection of the cover plate 131 and the insulating piece 132.

[0193] In a specific example, as shown in Figure 12As shown, multiple fixing posts 1321 spaced apart along the length of the insulating member 132 are symmetrically arranged along the line containing the midpoint of the insulating member 132 along its length, and multiple fixing posts 1321 spaced apart along the width of the insulating member 132 are symmetrically arranged along the line containing the midpoint of the insulating member 132 along its width. This maximizes the stable connection between the cover plate 131 and the insulating member 132.

[0194] In some embodiments, such as Figure 12 As shown, the insulating member 132 has two through holes 1327 spaced apart along its length. The tab 121 includes a positive tab and a negative tab, and the terminal 140 includes a positive terminal and a negative terminal. The positive tab and the positive terminal are electrically connected through one of the through holes 1327, and the negative tab and the negative terminal are electrically connected through the other through hole 1327. This reduces the difficulty of electrically connecting the tab 121 and the terminal 140, thereby facilitating the use of the tab 121 and the terminal 140 to draw out current, form a circuit, realize the charging and discharging function of the battery cell 100, and reduce the difficulty of using the battery cell 100.

[0195] It should be noted that the positive electrode tab and the positive electrode post can be directly connected to form an electrical connection. Alternatively, a positive electrode adapter can be provided between the positive electrode tab and the positive electrode post, which can be electrically connected to both the positive electrode tab and the positive electrode post, thus achieving a matching connection between the positive electrode tab and the positive electrode post. Similarly, the negative electrode tab and the negative electrode post can also be directly connected to form an electrical connection. Alternatively, a negative electrode adapter can be provided between the negative electrode tab and the negative electrode post, which can be electrically connected to both the negative electrode tab and the negative electrode post, thus achieving a matching connection between the negative electrode tab and the negative electrode post.

[0196] In some embodiments, such as Figure 12 As shown, in the length direction of the insulating member 132, the insulating member 132 has a first side 1323 arranged opposite to each other, and there are multiple fixing posts 1321. At least some of the fixing posts 1321 are arranged between two through holes 1327 to form a first fixing post 13213, and at least some of the fixing posts 1321 are arranged between the through hole 1327 and the first side 1323 to form a second fixing post 13214. This arrangement ensures that at least some of the fixing posts 1321 are positioned near the middle of the insulating member 132 along its length, and at least some of the fixing posts 1321 are positioned near the ends of the insulating member 132 along its length. This allows the middle of the insulating member 132 and both ends of the insulating member 132 along its length to form a stable connection with the cover plate 131 through multiple fixing posts 1321. This increases the connection strength between the cover plate 131 and the insulating member 132, achieving a stable connection between the cover plate 131 and the insulating member 132. This further prevents the cover plate 131 and the insulating member 132 from separating due to the weight of the electrode assembly 120 during the assembly of the battery cell 100, thereby improving the working performance of the battery cell 100.

[0197] In some embodiments, in combination with Figure 12 and Figure 13 As shown in FIG. 13, the second fixing column 13214 and the first fixing column 13213 are arranged along the width direction of the insulation piece 132, so that the plurality of fixing columns 1321 are uniformly arranged at the ends and the middle of the length direction of the insulation piece 132, thereby enabling the two ends and the middle of the length direction of the insulation piece 132 to be stably connected to the cover plate 131 through the plurality of fixing columns 1321.

[0198] In summary, the two ends and the middle of the length direction of the insulation piece 132 are provided with the plurality of fixing columns 1321, and the plurality of fixing columns 1321 at the ends and the plurality of fixing columns 1321 at the middle are arranged along the width direction of the insulation piece 132, so that the insulation piece 132 is connected to the cover plate 131 through the plurality of fixing columns 1321, and the plurality of fixing columns 1321 are uniformly distributed on the insulation piece 132, which is conducive to enhancing the connection strength of the cover plate 131 and the insulation piece 132.

[0199] In some embodiments, in combination with Figure 5 , Figure 6 and Figure 13 As shown in FIG. 13, the ends of the length direction of the insulation piece 132 are provided with support bosses 1322 protruding towards the electrode assembly 120, and the support bosses 1322 are adapted to be supported on the electrode assembly 120, wherein the second fixing column 13214 is arranged opposite to the support boss 1322 in the thickness direction of the cover plate 131. Through the support bosses 1322 supported on the electrode assembly 120, the position of the electrode assembly 120 is limited, the position stability of the electrode assembly 120 is improved, and the working performance of the electrode assembly 120 is ensured to a certain extent.

[0200] Meanwhile, by aligning the second fixing post 13214 with the support boss 1322, it facilitates, on the one hand, strengthening the connection between the insulating component 132 and the cover plate 131 at the support boss 1322 position, improving the positional stability of the insulating component 132 at the support boss 1322 position, and thus improving the positional stability of the support boss 1322. This allows the support boss 1322 to stably support the electrode assembly 120, ensuring the working performance of the support boss 1322 to a certain extent. On the other hand, it facilitates the connection between the cover plate 131 and the insulating component 132. The connection point is positioned directly opposite the contact point between the support boss 1322 and the electrode assembly 120, thereby optimizing the force path of the battery cell 100. This makes the force transmission direction of the battery cell 100 more clear and concentrated. When the battery cell 100 is subjected to external forces, these forces can be transmitted sequentially along the fixing post 1321, the support boss 1322, and the electrode assembly 120. This, to a certain extent, avoids excessive stress concentration or dispersion at the connection between the cover plate 131 and the insulating component 132, thus extending the service life of the battery cell 100.

[0201] In some embodiments, the support boss 1322 and the insulating member 132 are integrally formed. While reducing the molding difficulty of the support boss 1322, the connection strength between the support boss 1322 and the insulating member 132 can also be enhanced, so that the support boss 1322 can be stably set on the insulating member 132, thereby improving the positional stability of the support boss 1322 and facilitating the improvement of the support performance of the support boss 1322.

[0202] Of course, in some other embodiments, the support boss 1322 and the insulating member 132 can also be formed as separate parts. After the support boss 1322 and the insulating member 132 are processed separately, the support boss 1322 and the insulating member 132 are connected, which can also realize that the support boss 1322 is provided on the insulating member 132.

[0203] In some embodiments, combined with Figure 12 and Figure 13 As shown, the support boss 1322 is provided with a plurality of second fixing posts 13214. The cooperation of the plurality of second fixing posts 13214 can further enable the insulating part 132 at the position of the support boss 1322 and the cover plate 131 to form a stable connection, thereby further improving the positional stability of the support boss 1322.

[0204] In some embodiments, combined with Figures 21-24As shown, the fixing column 1321 further includes a third fixing column 13215, which is arranged between the through hole 1327 and the second fixing column 13214. Since the second fixing column 13214 is arranged opposite to the support boss 1322, by arranging the third fixing column 13215 between the through hole 1327 and the second fixing column 13214, it is convenient to arrange the fixing column 1321 (the third fixing column 13215) in the area of the insulating piece 132 close to the support boss 1322. It can be understood that, not only the fixing column 1321 (the second fixing column 13214) is arranged at the position opposite to the support boss 1322, but also the fixing column 1321 (the third fixing column 13215) is arranged at the position close to the support boss 1322, so as to further strengthen the connection strength between the insulating piece 132 and the cover plate 131 at the position of the support boss 1322, improve the position stability of the insulating piece 132 at the position of the support boss 1322, realize the improvement of the position stability of the support boss 1322, ensure the working performance of the support boss 1322 to a certain extent, and is also conducive to optimizing the stress path of the battery monomer 100, so that the stress transmission direction of the battery monomer 100 is more clear and concentrated.

[0205] In the length direction of the insulating piece 132, the insulating piece 132 has a first edge 1323 arranged opposite to the fixing column 1321, and the minimum distance B between the fixing column 1321 and the first edge 1323 satisfies: 6mm≤B≤10mm.

[0206] In some embodiments, in combination with Figure 5 、 Figure 15 、 Figure 16 and Figure 17 As shown, the battery monomer 100 further includes an insulating film 122, which wraps the outer periphery of the electrode assembly 120, and the support boss 1322 is fixed with the insulating film 122 by heat melting. In order to support the electrode assembly 120 by the support boss 1322 and improve the position stability of the electrode assembly 120.

[0207] In some embodiments, as shown in Figure 12 In the length direction of the insulating piece 132, the insulating piece 132 has a first edge 1323 arranged opposite to the fixing column 1321, and the minimum distance B between the fixing column 1321 and the first edge 1323 satisfies: 6mm≤B≤10mm. When the minimum distance between the fixing column 1321 and the first edge 1323 is small, the forming difficulty of the fixing column 1321 is increased, and there is a risk of damaging the first edge 1323 during the forming of the fixing column 1321, which affects the performance of the insulating piece 132. When the minimum distance between the fixing column 1321 and the first edge 1323 is large, the two ends of the insulating piece 132 in the length direction cannot be fixed by the fixing column 1321, which affects the fixing effect of the insulating piece 132.

[0208] Therefore, the minimum distance B between the fixing column 1321 and the first side 1323 is set to satisfy 6mm≤B≤10mm. In this way, the difficulty of forming the fixing column 1321 is reduced, the first side 1323 is prevented from being damaged during the forming of the fixing column 1321, the two ends of the insulation piece 132 in the length direction can be effectively fixed by the fixing column 1321, the position stability of the insulation piece 132 is improved, and the performance of the insulation piece 132 is improved.

[0209] Optionally, the minimum distance B between the fixing column 1321 and the first side 1323 is 6mm, 7mm, 8mm, 9mm or 10mm, etc.

[0210] In some embodiments, as shown in Figure 12 in the width direction of the insulation piece 132, the insulation piece 132 has a second side 1324 arranged oppositely, and the minimum distance A between the fixing column 1321 and the second side 1324 satisfies 4mm≤A≤6mm. The beneficial effects can refer to those of setting the minimum distance B between the fixing column 1321 and the first side 1323 to satisfy 6mm≤B≤10mm, which will not be repeated here.

[0211] Optionally, the minimum distance between the fixing column 1321 and the second side 1324 is 4mm, 4.5mm, 5mm, 5.5mm or 6mm, etc.

[0212] In some embodiments, as shown in Figure 12 the through hole 1327 is arranged on the insulation piece 132, and the tab 121 and the pole 140 are electrically connected through the through hole 1327. In this way, the connection of the tab 121 and the pole 140 is facilitated.

[0213] In some embodiments, in combination with Figure 5 , Figure 10 , Figure 11 and Figure 12As shown, the cover plate 131 is provided with a pressure relief mechanism 150. In the length direction of the insulating piece 132, the projection of the pressure relief mechanism 150 on the insulating piece 132 is spaced apart from the through hole 1327, and the fixing column 1321 includes a first fixing column 13213 which is arranged between the through hole 1327 and the projection of the pressure relief mechanism 150 on the insulating piece 132, and the first fixing column 13213 is arranged staggered with the pressure relief mechanism 150. By arranging the pressure relief mechanism 150, when the internal pressure of the battery monomer 100 rises due to overcharge, overdischarge, overcurrent and internal short circuit, the automatic and rapid pressure relief of the battery monomer 100 can be realized by the pressure relief mechanism 150, so as to avoid the explosion of the battery monomer 100 to a certain extent and improve the use safety of the battery monomer 100. By spacing the projection of the pressure relief mechanism 150 on the insulating piece 132 and the through hole 1327, the interference of the pressure relief mechanism 150 with the matching connection of the tab 121 and the pole 140 can be avoided to a certain extent, and the connection difficulty of the tab 121 and the pole 140 is further reduced.

[0214] At the same time, by arranging the first fixing column 13213 between the through hole 1327 and the projection of the pressure relief mechanism 150 on the insulating piece 132, the first fixing column 13213 can be arranged close to the pressure relief mechanism 150, so that the connection point of the first fixing column 13213 and the cover plate 131 is arranged close to the pressure relief mechanism 150, the connection strength of the cover plate 131 and the insulating piece 132 around the pressure relief mechanism 150 is facilitated to be strengthened, and the structural strength of the cover plate 131 around the pressure relief mechanism 150 is further strengthened, so that the pressure relief mechanism 150 can be stably arranged on the cover plate 131, and the working performance of the pressure relief mechanism 150 is ensured to a certain extent.

[0215] In addition, the first fixing column 13213 is arranged staggered with the pressure relief mechanism 150, that is, in the thickness direction of the cover plate assembly 130, the first fixing column 13213 is not arranged opposite to the pressure relief mechanism 150, which can avoid the influence of the first fixing column 13213 on the pressure relief mechanism 150 in the process of thermal fusion, such as causing the breakage of the pressure relief mechanism 150 itself, or the breakage of the connection between the pressure relief mechanism 150 and the cover plate 131, and further avoiding the influence on the performance of the pressure relief mechanism 150.

[0216] In some embodiments, the pressure relief mechanism 150 is an explosion-proof plate. When the battery monomer 100 abnormally causes the gas pressure to rise, the explosion-proof plate is broken, so as to discharge the gas pressure through the cover plate 131 to achieve the purpose of pressure relief and improve the use safety of the battery monomer 100.

[0217] In some embodiments, as shown in FIG. 1, the cover plate 131 is provided with a plurality of pressure relief mechanisms 150, and the first fixing column 13213 is arranged between the through hole 1327 and the projection of the pressure relief mechanism 150 on the insulating piece 132. Figure 12As shown, the minimum distance of the projection of the fixing column 1321 on the cover plate 131 to the pressure relief mechanism 150 is E, 50mm≥E≥17mm. So that the minimum distance of the connecting point of the fixing column 1321 and the cover plate 131 to the pressure relief mechanism 150 satisfies: 17mm~50mm, wherein, when the minimum distance of the connecting point of the fixing column 1321 and the cover plate 131 to the pressure relief mechanism 150 is smaller, the connecting point of the fixing column 1321 and the cover plate 131 is closer to the pressure relief mechanism 150, so that the pressure relief mechanism 150 is easily affected in the process of heat melting of the fixing column 1321, such as: causing the pressure relief mechanism 150 to break itself; or, the connecting part of the pressure relief mechanism 150 and the cover plate 131 is broken, thereby affecting the performance of the pressure relief mechanism 150; when the minimum distance of the connecting point of the fixing column 1321 and the cover plate 131 to the pressure relief mechanism 150 is larger, the fixing effect of the fixing column 1321 is affected.

[0218] Therefore, the minimum distance E of the projection of the fixing column 1321 on the cover plate 131 to the pressure relief mechanism 150 is set to: 50mm≥E≥17mm, so as to avoid the cover plate 131 and the insulating piece 132 from causing the pressure relief mechanism 150 to break or the connecting part of the pressure relief mechanism 150 and the cover plate 131 to break when being connected by the fixing column 1321, to ensure the performance of the pressure relief mechanism 150 to a certain extent, and to enable the fixing column 1321 to realize the fixed connection of the cover plate 131 and the insulating piece 132.

[0219] In some embodiments, the minimum distance E of the projection of the fixing column 1321 on the cover plate 131 to the pressure relief mechanism 150 is 17mm, 18mm, 19mm, 20mm, 30mm, 40mm or 50mm, etc.

[0220] In some embodiments, the minimum distance E of the projection of the fixing column 1321 on the cover plate 131 to the pressure relief mechanism 150 satisfies: 17mm≤E≤20mm. So as to avoid the distance between the fixing column 1321 and the pressure relief mechanism 150 from being too far, so that the plurality of fixing columns 1321 are arranged close to the pressure relief mechanism 150, which is beneficial to strengthen the connection strength of the cover plate 131 and the insulating piece 132, to realize the increase of the structural strength of the cover plate 131 close to the pressure relief mechanism 150, to improve the structural stability of the cover plate 131, and to improve the position stability of the pressure relief mechanism 150.

[0221] Of course, in some embodiments, when the pressure relief mechanism 150 is arranged in the shell 110, the fixing column 1321 is not easy to damage the pressure relief mechanism 150 in the process of heat melting because the pressure relief mechanism 150 is far away from the fixing column 1321, so the minimum distance of the projection of the fixing column 1321 on the shell 110 to the pressure relief mechanism 150 can also be less than 17mm, which is not limited here.

[0222] In some embodiments, as shown in Figure 12 and Figure 13 A plurality of first fixing columns 13213 are distributed on opposite sides of the pressure relief mechanism 150 along the length direction of the insulation member 132. This not only strengthens the connection between the cover plate 131 and the insulation member 132, but also strengthens the connection between the cover plate 131 and the insulation member 132 near the pressure relief mechanism 150, thereby strengthening the structural strength of the cover plate 131 near the pressure relief mechanism 150 and improving the structural stability of the cover plate 131, so as to improve the positional stability of the pressure relief mechanism 150 and ensure the performance of the pressure relief mechanism 150 to a certain extent.

[0223] In some embodiments, as shown in Figure 12 The plurality of first fixing columns 13213 on the same side of the pressure relief mechanism 150 are arranged at intervals along the length direction and / or the width direction of the insulation member 132. This can achieve a larger number of first fixing columns 13213 distributed on opposite sides of the pressure relief mechanism 150, effectively strengthening the connection between the cover plate 131 and the insulation member 132 near the pressure relief mechanism 150.

[0224] Of course, in other embodiments, as shown in Figure 13 The plurality of first fixing columns 13213 on the same side of the pressure relief mechanism 150 can also be arranged at intervals only along the width direction of the insulation member 132, reducing the difficulty of forming the first fixing columns 13213.

[0225] In some embodiments, as shown in Figure 12 The distance between the adjacent two first fixing columns 13213 on the same side of the pressure relief mechanism 150 along the length direction of the insulation member 132 is C, and 50mm≥C≥13mm. This can to some extent avoid the adjacent first fixing columns 13213 being too close or too far apart. When the adjacent first fixing columns 13213 are too close, there is a problem that the adjacent first fixing columns 13213 affect each other during the connection process, increasing the manufacturing difficulty of the first fixing columns 13213. When the adjacent first fixing columns 13213 are too far apart, the fixing effect of the cover plate 131 and the insulation member 132 is affected.

[0226] Therefore, the distance C between the adjacent two first fixing columns 13213 on the same side of the pressure relief mechanism 150 along the length direction of the insulation member 132 is set to satisfy 50mm≥C≥13mm. This not only reduces the manufacturing difficulty of the first fixing columns 13213, but also to some extent avoids the first fixing columns 13213 affecting each other during the connection process, on the one hand reducing the connection difficulty of the cover plate 131 and the insulation member 132, and on the other hand improving the performance of the first fixing columns 13213, so that the first fixing columns 13213 can effectively achieve stable connection of the cover plate 131 and the insulation member 132. ​

[0227] Optionally, the interval C of the two adjacent first fixing columns 13213 in the length direction of the insulation piece 132 is 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 30 mm, 40 mm, or 50 mm, etc.

[0228] In some embodiments, as shown in Figure 12 , the interval C of the two adjacent second fixing columns 13214 in the width direction of the insulation piece 132 is 50 mm≥C≥13 mm. In this way, the distance between the two adjacent second fixing columns 13214 can be controlled to a certain extent. When the distance between the two adjacent second fixing columns 13214 is too small, the two adjacent second fixing columns 13214 may interfere with each other during the connection process, increasing the manufacturing difficulty of the second fixing column 13214. When the distance between the two adjacent second fixing columns 13214 is too large, the fixing effect of the cover plate 131 and the insulation piece 132 is affected.

[0229] Therefore, the interval C of the two adjacent second fixing columns 13214 in the width direction of the insulation piece 132 is set to satisfy 50 mm≥C≥13 mm. In this way, the manufacturing difficulty of the second fixing column 13214 is reduced, and the second fixing column 13214 is prevented from interfering with each other during the connection process to a certain extent. On the one hand, the connection difficulty of the cover plate 131 and the insulation piece 132 is reduced, and on the other hand, the performance of the second fixing column 13214 is improved, so that the stable connection of the cover plate 131 and the insulation piece 132 can be effectively realized by using the second fixing column 13214.

[0230] In specific examples, the interval C of the two adjacent second fixing columns 13214 in the width direction of the insulation piece 132 is 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 30 mm, 40 mm, or 50 mm, etc.

[0231] In some embodiments, as shown in Figure 5 , Figure 6 and Figure 13 , a portion of the insulation piece 132 is recessed towards the electrode assembly 120 to define a sink 1326, and the sink 1326 is provided with a hollow region 1325. The pressure relief mechanism 150 is arranged corresponding to the hollow region 1325. The hollow region 1325 is used to realize the communication between the pressure relief mechanism 150 and the side of the insulation piece 132 away from the cover plate 131, so as to ensure that when the internal pressure of the battery monomer 100 rises due to overcharge, overdischarge, overcurrent, and internal short circuit, the automatic and rapid pressure relief of the battery monomer 100 can be effectively realized by using the pressure relief mechanism 150, and the use safety of the battery monomer 100 is improved.

[0232] In some embodiments, at least a part of the pressure relief mechanism 150 is located in the sink 1326. While achieving the protection of the pressure relief mechanism 150 by the sink 1326, the pressure relief mechanism 150 can also be arranged close to the electrode assembly 120, improving the explosion-proof performance of the pressure relief mechanism 150, and the sink 1326 also functions to avoid the pressure relief mechanism 150, so that the pressure relief mechanism 150 can effectively vent when subjected to external pressure.

[0233] In some embodiments, as shown in Figure 12 and Figure 13 , the sink 1326 is provided with a through hole, which is formed as a hollow area 1325 to reduce the difficulty of forming the hollow area 1325.

[0234] In some embodiments, as shown in Figure 12 and Figure 13 , a plurality of fixing columns 1321 are arranged around the sink 1326, so that the connection points of the plurality of fixing columns 1321 and the cover plate 131 can be arranged close to the pressure relief mechanism 150, which not only can strengthen the connection strength of the cover plate 131 and the insulating piece 132, but also can facilitate increasing the structural strength of the cover plate 131 close to the pressure relief mechanism 150, improving the structural stability of the cover plate 131, and thus improving the positional stability of the pressure relief mechanism 150.

[0235] In some embodiments, as shown in Figure 5 , the battery monomer 100 further comprises an insulating film 122, which is wrapped around the outer periphery of the electrode assembly 120, and the insulating piece 132 is fixedly connected with the insulating film 122 (the fixed connection point of the insulating piece 132 and the insulating film 122 can be understood as the position shown by reference numeral 160 in Figure 17 ). Wherein, by wrapping the insulating film 122 around the outer periphery of the electrode assembly 120, the electrode assembly 120 is isolated from the shell 110, which functions to protect the electrode assembly 120, prolongs the service life of the electrode assembly 120, and improves the use safety of the electrode assembly 120.

[0236] At the same time, by fixedly connecting the insulating piece 132 with the insulating film 122, the fixed connection of the insulating piece 132 and the electrode assembly 120 is achieved, and the difficulty of the fixed connection of the insulating piece 132 and the electrode assembly 120 is reduced, so that the insulating piece 132 can be stably arranged between the cover plate 131 and the electrode assembly 120, to a certain extent, ensuring the working performance of the insulating piece 132.

[0237] Wherein, the schematic of the fixed connection of the insulating piece 132 and the insulating film 122 can be referred to Figures 15-18 , and the fixed connection of the insulating piece 132 and the insulating film 122 can be heat melting or clamping, etc.

[0238] In summary, the side of the insulating piece 132 facing the cover plate 131 is fixedly connected to the cover plate 131 by the fixing column 1321, so as to realize the fixed connection of the insulating piece 132 between the cover plate 131 and the electrode assembly 120. The side surface of the insulating piece 132 is fixedly connected with the insulating film 122, so that the insulating film 122 wraps the electrode assembly 120.

[0239] In some embodiments, in combination with Figure 5 、 Figure 15 、 Figure 16 and Figure 17 , the insulating film 122 is sleeved on the outer periphery of the electrode assembly 120. The first aspect is to protect the electrode assembly 120 by the insulating film 122, so as to avoid the physical and chemical damage of the electrode assembly 120 to a certain extent, such as scratches, corrosion, etc., thereby prolonging the service life of the electrode assembly 120; the second aspect can also isolate the positive and negative electrodes of the electrode assembly 120, so as to prevent the short circuit problem caused by the direct contact between the electrode sheets or external factors (such as metal debris, moisture, etc.), thereby ensuring the safe operation of the battery monomer 100 and improving the use safety of the battery monomer 100; the third aspect can support the electrode assembly 120, and the weight of the electrode assembly 120 avoids the stress pulling of the tab 121, prolongs the service life of the tab 121, and enables the tab 121 to effectively play its own role.

[0240] In some embodiments, in combination with Figure 12 Figure 15 、 Figure 16 and Figure 17 , the fixed position between the insulating piece 132 and the insulating film 122 is defined as the first fixed point 160, and the distance between the projection of the first fixed point 160 on the insulating piece 132 and the second fixed column 13214 is less than the distance between the second fixed column 13214 and the first fixed column 13213. That is, the second fixed column 13214 between the insulating piece 132 and the cover plate 131 is arranged close to the fixed position between the insulating piece 132 and the insulating film 122, so that when the battery monomer 100 is subjected to external force, the force can be transmitted along the second fixed column 13214 and the electrode assembly 120 in turn, thereby avoiding excessive stress concentration or dispersion at the connection between the cover plate 131 and the insulating piece 132 to a certain extent, and prolonging the service life of the battery monomer 100.

[0241] Through the above arrangement, in a specific example, in order to realize the stable connection of the cover plate 131 and the insulating piece 132, the number n of the fixing columns 1321, the weight M of the electrode assembly 120 and the tensile force that can be borne by a single fixing column 1321 are arranged to meet the relationship n≥KM / (FS), and in addition to meeting the above relationship, the following conditions are also met in the arrangement of the plurality of fixing columns 1321: both ends of the length direction of the insulating piece 132 are provided with a plurality of fixing columns 1321, and the plurality of fixing columns 1321 are arranged along the width direction of the insulating piece 132, the minimum distance B between the fixing column 1321 and the first side 1323 meets 6mm≤B≤10mm; the projection of the pressure relief mechanism 150 on the insulating piece 132 is provided with a plurality of fixing columns 1321 on the opposite sides, respectively, the plurality of fixing columns 1321 are arranged along the width direction of the insulating piece 132 or along the width and length directions of the insulating piece 132, the minimum distance E of the projection of the fixing column 1321 on the cover plate 131 to the pressure relief mechanism 150 meets 0mm≥E≥17mm, the distance C between adjacent fixing columns 1321 meets 50mm≥C≥13mm, and the minimum distance A between the fixing column 1321 and the second side 1324 meets 4mm≤A≤6mm.

[0242] In some embodiments, the capacity of the battery cell 100 is greater than 400 Ah.

[0243] The capacity of the battery cell 100 can be obtained by the following method:

[0244] At 25℃, the battery cell 100 is rested for 5 min, discharged at 0.33C constant current to the lower limit cut-off voltage, rested for 5 min, charged at 0.33C constant current to the upper limit cut-off voltage, and then charged at constant voltage to the current of 0.05C at the upper limit cut-off voltage; rested for 5 min, discharged at 0.33C constant current to the lower limit cut-off voltage, and the discharge capacity at this time is recorded, which is the capacity of the battery cell 100.

[0245] The upper limit cut-off voltage and the lower limit cut-off voltage can be the charging and discharging voltage recommended in the product specification of the battery cell 100. For example, when the positive active material includes lithium iron phosphate and the negative active material includes graphite, the upper limit cut-off voltage of the battery cell 100 can be 3.65V, and the lower limit cut-off voltage can be 2.5V.

[0246] In this embodiment, by limiting the rated capacity of the battery cell 100, the endurance of the battery cell 100 is improved.

[0247] In some embodiments, the size W21 of the shell 110 in the first direction is greater than or equal to 80 mm and less than or equal to 300 mm; the size L21 of the shell 110 in the second direction is greater than or equal to 68 mm and less than or equal to 100 mm; the size H21 of the shell 110 in the third direction is greater than or equal to 205 mm and less than or equal to 250 mm; the first direction, the second direction and the third direction intersect with each other. W21, L21 and H21 can refer to Figure 5 It should be noted that the first direction can be the length direction of the shell 110, and in the square shell form of the battery monomer 100, the first direction can correspond to the width direction of the battery monomer 100; the second direction can be the width direction of the shell 110, and in the square shell form of the battery monomer 100, the second direction can correspond to the thickness direction of the battery monomer 100; the third direction can be the height direction of the shell 110, and in the square shell form of the battery monomer 100, the third direction can correspond to the height direction of the battery monomer 100.

[0248] The size W21 of the shell 110 in the first direction can be 80 mm, 85 mm, 90 mm, 100 mm, 150 mm, 200 mm, 260 mm or 300 mm, etc. The size L21 of the shell 110 in the second direction can be 68 mm, 70 mm, 72 mm, 75 mm, 80 mm, 85 mm, 90 mm, 100 mm, etc. The size H21 of the shell 110 in the third direction can be 205 mm, 207 mm, 210 mm, 215 mm, 220 mm, 230 mm, 240 mm, 250 mm, etc.

[0249] In the present embodiment, by limiting the size of the shell 110 in the first direction, the second direction and the third direction, the shell 110 can be adapted to a large size battery monomer 100.

[0250] In some embodiments, as shown in Figure 25 The inner periphery of the open port 111 is provided with a groove 1111, and the end of the cover plate 131 is accommodated in the groove 1111 and welded with the shell 110. To realize the fixed connection of the cover plate 131 and the shell 110.

[0251] In a specific example, the cover plate 131 and the shell 110 are welded by the top.

[0252] In some embodiments, as shown in Figure 26 and Figure 27 The cover plate 131 overlaps the end of the shell 110 and is welded with the shell 110. To realize the fixed connection of the cover plate 131 and the shell 110.

[0253] In a specific example, the cover plate 131 and the shell 110 are welded by the side.

[0254] In some embodiments, the battery cell 100 is combined with Figure 26 and Figure 27 As shown in FIG. 13, the outer periphery of the cover plate 131 is provided with a lap protrusion 1312 which laps the end of the shell 110 and is welded with the shell 110 to achieve the fixed connection of the cover plate 131 with the shell 110.

[0255] The battery device 200 of the present application is described below with reference to the accompanying drawings.

[0256] As shown in FIG. 14, the battery device 200 of the present application comprises the battery cell 100 of the above embodiments. Figure 3 Since the battery cell 100 of the present application has the above technical effects, the battery device 200 of the present application also has the above technical effects, i.e. by adopting the battery cell 100 of the present application, the working performance of the battery device 200 is improved.

[0257] The energy storage device 300 of the present application is described below with reference to the accompanying drawings.

[0258] As shown in FIG. 15, the energy storage device 300 of the present application comprises a plurality of battery cells 100 of the above embodiments or a plurality of battery devices 200 of the above embodiments, and the battery cells 100 or the battery devices 200 are used to store or provide electric energy.

[0259] Figure 2 Since the battery cell 100 or the battery device 200 of the present application has the above technical effects, the energy storage device 300 of the present application also has the above technical effects, i.e. by adopting the battery cell 100 or the battery device 200 of the present application, the working performance of the energy storage device 300 is improved.

[0260] The power consumption device 1000 of the present application is described below with reference to the accompanying drawings.

[0261] As shown in FIG. 16, the power consumption device 1000 of the present application comprises the battery cell 100 of the above embodiments, the battery device 200 of the above embodiments or the energy storage device 300 of the above embodiments, and the battery cell 100 or the battery device 200 is used to store or provide electric energy.

[0262] Since the battery cell 100, the battery device 200 or the energy storage device 300 of the present application has the above technical effects, the power consumption device 1000 of the present application also has the above technical effects, i.e. by adopting the battery cell 100, the battery device 200 or the energy storage device 300 of the present application, the working performance of the power consumption device 1000 is improved. Figure 1

[0263] ​​​

[0264] It can be understood that other configurations of the battery cell 100, the battery device 200, the energy storage device 300 and the power utilization device 1000 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail herein.

[0265] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0266] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell (100), characterized by The application relates to a battery cover plate assembly. The battery cover plate assembly comprises: a shell (110) with an open end (111); an electrode assembly (120) arranged in the shell (110), the electrode assembly (120) being provided with a tab (121); The cover plate assembly (130) is configured to satisfy: nKM / (FS), wherein n is the number of the fixing columns (1321); M is the weight of the electrode assembly (120), the unit of M is N, and the value range of M is 50N≤M≤120N; S is the cross-sectional area of a single first part (13211), the unit of S is mm 2 ; the value range of K is 5≤K≤9; and F is the unit of N / mm 2 , and the value range of F is 15N / mm 2 ≤F≤25N / mm 2 .

2. The battery cell (100) according to claim 1, characterized in that The first portion (13211) is cylindrical, S = π(D / 2) 2 where D is the diameter of the first portion (13211) in mm.

3. The battery cell (100) according to claim 2, characterized in that a cover plate assembly (130) arranged in the shell (110) to cover the open end (111), the cover plate assembly (130) comprising a cover plate (131) and an insulating piece (132), the cover plate (131) being provided with a pole (140) electrically connected to the tab (121), the insulating piece (132) being arranged between the cover plate (131) and the electrode assembly (120), the cover plate (131) being provided with at least one fixing hole (1311), the insulating piece (132) being provided with at least one fixing column (1321) matched with the fixing hole (1311) to fixedly connect the cover plate (131) and the insulating piece (132), the fixing column (1321) comprising a first part (13211) and a second part (13212) connected to each other, the first part (13211) being arranged in the fixing hole (1311), the second part (13212) being arranged on a side of the first part (13211) away from the insulating piece (132), the second part (13212) having a cross-sectional area greater than that of the first part (13211); 4. The battery cell (100) according to claim 3, characterized in that 4<=n<=22, D>=2mm.

5. The battery cell (100) according to any one of claims 1-4, characterized in that, 10≤n≤14。 6. The battery cell (100) according to any one of claims 1-5, characterized in that, 2.5mm<=D<=5mm.

7. The battery cell (100) according to any one of claims 1-6, characterized in that, The fixing hole (1311) comprises a first fixing hole (13111) and a second fixing hole (13112) in communication with each other, the first fixing hole (13111) being open towards the insulating piece (132), the second fixing hole (13112) being arranged on a side of the first fixing hole (13111) away from the insulating piece (132), at least part of the second fixing hole (13112) having a hole diameter greater than that of the first fixing hole (13111), the first part (13211) being arranged in the first fixing hole (13111), the second part (13212) being arranged in the second fixing hole (13112), and the fixing column (1321) being a plastic piece.

8. The battery cell (100) according to claim 7, characterized in that The fixing column (1321) is a plurality of fixing columns, a part of the fixing columns (1321) being arranged along the length direction of the insulating piece (132), and a part of the fixing columns (1321) being arranged along the width direction of the insulating piece (132). The fixing columns (1321) arranged along the length direction of the insulating piece (132) are symmetrically arranged along a straight line where a midpoint in the length direction of the insulating piece (132) is located; and / or, The fixing columns (1321) arranged along the width direction of the insulating piece (132) are symmetrically arranged along a straight line where a midpoint in the width direction of the insulating piece (132) is located.

9. The battery cell (100) according to any one of claims 1-8, characterized in that, The insulating piece (132) is provided with two through holes (1327) arranged at intervals along the length direction of the insulating piece (132), the tab (121) includes a positive tab and a negative tab, the pole (140) includes a positive pole and a negative pole, the positive tab and the positive pole are electrically connected through one of the through holes (1327), and the negative tab and the negative pole are electrically connected through the other through hole (1327); In the length direction of the insulating piece (132), the insulating piece (132) has oppositely arranged first edges (1323), and the fixing columns (1321) are provided between the two through holes (1327) to form first fixing columns (13213) and between the through holes (1327) and the first edges (1323) to form second fixing columns (13214).

10. The battery cell (100) according to claim 9, characterized in that The end of the length direction of the insulating piece (132) is provided with a support boss (1322) protruding towards the electrode assembly (120), and the support boss (1322) is adapted to be supported on the electrode assembly (120), wherein in the thickness direction of the cover plate (131), the second fixing column (13214) is arranged opposite to the support boss (1322).

11. The battery cell (100) according to claim 9 or 10, characterized in that The fixing column (1321) further includes a third fixing column (13215) arranged between the through hole (1327) and the second fixing column (13214).

12. The battery cell (100) according to any one of claims 1-11, characterized in that, In the length direction of the insulating piece (132), the insulating piece (132) has oppositely arranged first edges (1323), and the minimum distance B between the fixing column (1321) and the first edge (1323) satisfies: 6mm≤B≤10mm; and / or, In the width direction of the insulating piece (132), the insulating piece (132) has oppositely arranged second edges (1324), and the minimum distance A between the fixing column (1321) and the second edge (1324) satisfies: 4mm≤A≤6mm.

13. The battery cell (100) according to any one of claims 1-12, characterized in that, The insulating piece (132) is provided with a through hole (1327), and the tab (121) and the pole (140) are electrically connected through the through hole (1327); The cover plate (131) is provided with a pressure relief mechanism (150), and in the length direction of the insulating piece (132), the projection of the pressure relief mechanism (150) on the insulating piece (132) is arranged at intervals with the through hole (1327), the fixing column (1321) includes a first fixing column (13213), the first fixing column (13213) is arranged between the through hole (1327) and the projection of the pressure relief mechanism (150) on the insulating piece (132), and the first fixing column (13213) is arranged staggered with the pressure relief mechanism (150).

14. The battery cell (100) according to claim 13, characterized in that The minimum distance of the projection of the fixing column (1321) on the cover plate (131) to the pressure relief mechanism (150) is E, and 50mm≥E≥17mm.

15. The battery cell (100) according to claim 13 or 14, characterized in that A plurality of first fixing columns (13213) are distributed on opposite sides of the pressure relief mechanism (150) in the length direction of the insulating member (132).

16. The battery cell (100) according to claim 15, characterized in that The plurality of first fixing columns (13213) on the same side of the pressure relief mechanism (150) are arranged at intervals in the length direction and / or the width direction of the insulating member (132).

17. The battery cell (100) according to claim 16, characterized in that The interval of the adjacent two first fixing columns (13213) on the same side of the pressure relief mechanism (150) in the length direction of the insulating member (132) is C, and 50mm≥C≥13mm.

18. The battery cell (100) according to any one of claims 13-17, characterized in that, A portion of the insulating member (132) is recessed towards the electrode assembly (120) to define a sink (1326), and a hollow area (1325) is arranged in the sink (1326), and the pressure relief mechanism (150) is arranged corresponding to the hollow area (1325).

19. The battery cell (100) according to any one of claims 1-18, characterized in that, Further comprising an insulating film (122) wrapped around the outer periphery of the electrode assembly (120), and the insulating member (132) is fixedly connected with the insulating film (122).

20. The battery cell (100) according to any one of claims 1-19, characterized in that, The capacity of the battery monomer (100) is greater than 400Ah.

21. The battery cell (100) according to any one of claims 1-20, characterized in that, The size of the shell (110) in the first direction is greater than or equal to 80mm and less than or equal to 300mm; The size of the shell (110) in the second direction is greater than or equal to 68mm and less than or equal to 100mm; The size of the shell (110) in the third direction is greater than or equal to 205mm and less than or equal to 250mm; The first direction, the second direction and the third direction intersect with each other.

22. The battery cell (100) according to any one of claims 1-21, characterized in that, The inner periphery of the open mouth (111) is provided with a recess (1111), and the end of the cover plate (131) is accommodated in the recess (1111) and welded with the shell (110).

23. The battery cell (100) according to any one of claims 1-22, characterized in that, The cover plate (131) overlaps the end of the shell (110) and is welded with the shell (110).

24. A battery device (200) characterized by The battery monomer (100) according to any one of claims 1-23.

25. An energy storage device (300) characterized by, A plurality of battery monomers (100) according to any one of claims 1-23 or a plurality of battery devices (200) according to claim 24 are used for storing or providing electric energy.

26. An electrically powered device (1000), characterized by The battery monomer (100) according to any one of claims 1-23, the battery device (200) according to claim 24 or the energy storage device (300) according to claim 25 are used for storing or providing electric energy.

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