WO2023097977A1

WO2023097977A1 - Connecting assembly, battery module, battery and power consuming device

Info

Publication number: WO2023097977A1
Application number: PCT/CN2022/092618
Authority: WO
Inventors: 吴孝智
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2021-12-02
Filing date: 2022-05-13
Publication date: 2023-06-08
Also published as: CN216389621U

Abstract

Disclosed in the present application are a connecting assembly, a battery module, a battery and a power consuming device. The connecting assembly comprises a first connector connected to a battery cell and a second connector connected to an end plate. One of the first connector and the second connector is provided with a containing cavity, the other one can be installed in the containing cavity, and in the connecting assembly connecting the battery cell and the end plate, the other one has a moving allowance in the containing cavity in a width direction, a thickness direction and a height direction of the battery cell.

Description

Connection components, battery modules, batteries and electrical devices

Cross References to Related Applications

This application claims priority to Chinese Patent Application No. 202123008125.3, filed on December 02, 2021, entitled "Connection Components, Battery Modules, Batteries, and Electrical Devices," the entire contents of which are incorporated herein by reference .

technical field

The present application relates to the field of battery technology, in particular to a connection assembly, a battery module, a battery and an electrical device.

Background technique

The battery cells are connected to the end plates through connecting components, and then assembled to form a battery module. In a conventional connection method, the battery cells and the end plates are locked with fasteners.

However, existing connection assemblies also suffer from the inability to absorb assembly tolerances and expansion of the cells during use.

Contents of the invention

In view of the above problems, the present application provides a connection assembly, a battery module, a battery and an electrical device, which can absorb assembly tolerances in the assembly process and simplify the assembly process. And it can absorb the expansion of the battery core during use.

In a first aspect, the present application provides a connecting assembly, including: a first connecting piece for connecting to a battery cell and a second connecting piece for connecting to an end plate. Wherein, the first part of the first connector and the second connector has a receiving cavity, and the second part can be installed in the receiving cavity. There is a movable margin along the width direction, thickness direction and height direction of the battery cell.

In the technical solution of the embodiment of the present application, the first connector and the second connector are provided with a movable margin, so that the assembly tolerance and the expansion of the battery cell can be absorbed by the movable margin, effectively improving the assembly efficiency As well as the quality of assembly, it can also improve the service life of the battery.

In some embodiments, the first party is the second connector and the second party is the first connector.

In some embodiments, in the connection assembly connecting the battery cells and the end plates, at least one side of the second party along the width direction, at least one side of the thickness direction, and at least one side of the height direction, and the receiving cavity There are gaps between the inner walls, and the gaps provide a movable margin. By setting the gap, a play margin is created between the first connecting member and the second connecting member, so that the assembly tolerance and the expansion of the battery cells can be absorbed by the play margin.

In some embodiments, in the connection assembly connecting the battery cells and the end plates, at least one side of the second party along the width direction, at least one side of the thickness direction, and at least one side of the height direction, and the receiving cavity Elastic units are respectively arranged between the inner walls of the inner wall, and the elastic units can be elastically deformed under the action of external force, and the deformation amount of the elastic deformation provides a movable margin. By arranging the elastically deformable elastic unit, a play margin is created between the first connecting member and the second connecting member, so that the assembly tolerance and the expansion of the battery cells can be absorbed by the play margin.

In some embodiments, the second side has a threaded hole, and the second side is connected to the output pole assembly of the battery cell through bolts; wherein at least a part of the inner wall of the accommodation cavity restricts the rotation of the second side, so that during the process of assembling the bolts, The second party does not spin in the housing.

In some embodiments, the second side has limiting parts, and the limiting parts are arranged in pairs on both sides of the second side in the width direction in the connected state, and the limiting parts on the same side are configured to be arranged respectively At the two ends of the second side and the three in the middle, the inner wall of the accommodation cavity has a matching portion corresponding to each limiting portion; wherein, when the second side has a tendency to rotate in the accommodation cavity, the limiting portion first contacts the matching portion , to limit the rotation of the second party. By arranging three limiting portions on the same side of the first connecting piece in the width direction, the anti-rotation effect can be improved.

In some embodiments, the side wall in the thickness direction of the first party in the connected state has a first opening, and the first opening allows the second party to be inserted into the receiving cavity; wherein, the second party has an elastic buckle, and the receiving cavity There is a stopper, during the insertion process, the elastic buckle is squeezed and deformed by the stopper, and after the insertion, the elastic buckle is elastically reset, and cooperates with the stopper to limit the second party from coming out of the accommodating cavity. By providing the elastic buckle and the stopper, the first connecting part and the second connecting part can be assembled and connected in a snap-fit manner, which is convenient for assembly and disassembly. In addition, in the assembled state, it is easy to realize the positioning of the second party in the accommodation cavity, preventing the first connecting part and the second connecting part from disassembling the assembled state after the second party is disengaged.

In some embodiments, the inlet of the first opening is flared. By setting the first opening with a flaring structure, when the second side is inserted into the receiving cavity, the inclined surface can contact the elastic buckle on the second side and guide the deformation of the elastic buckle, so as to facilitate the insertion process .

In some embodiments, the top wall of the accommodating cavity has a second opening, and the second side has a first clamping portion and a second clamping portion, and the first clamping portion and the second clamping portion are arranged at intervals along the height direction in the connected state; wherein , after the second party is installed in the accommodating chamber, the top surface of the second party is exposed in the accommodating chamber. The height direction escapes from the second opening. By configuring the distance between the first clamping part and the second clamping part along the height direction, it is possible to ensure that the first connecting part has a certain degree of freedom of movement along the height direction and at the same time limit the position of the first connecting part, and the second The top surface of a connecting piece is exposed in the containing cavity, which is convenient for connecting with the battery cells.

In some embodiments, the second side has a top wall, the first locking portion is disposed on the top wall of the second side, and the second side further includes a third locking portion and a connecting portion. The third locking portion protrudes toward both sides of the second party in the width direction in the connected state. The connecting part connects the third clamping part and the top wall of the second side; wherein, the third clamping part is an elastic unit. In this way, when the connection assembly is connected to the battery cell, the third clamping part can abut against the top wall of the containing cavity, so that the top wall of the containing cavity can be elastically locked by the third clamping part and the first clamping part, thereby lifting The firmness of the connection state. Moreover, when the first connecting part moves away from the second connecting part along the height direction, the third locking part can be elastically deformed to provide a movable margin for the displacement of the first connecting part.

In some embodiments, in the cross section of the third clamping portion and the connecting portion, the included angle between the third clamping portion and the connecting portion is less than 90°; wherein, the third clamping portion is a cantilever, and the free side of the cantilever Configured as the longest side in the cantilever. Since the outer edge of the third clamping portion first contacts with the top wall of the accommodating chamber during the activity, configuring it as the longest side in the third clamping portion can make the third clamping portion 113 more effective when in contact with the top wall of the accommodating cavity. There are many contact points, so that the third locking part is more likely to be elastically deformed under the action of external force, and provide a movable margin between the first connecting part and the second connecting part.

In some embodiments, along the height direction in the connected state, the height of the second locking portion is greater than that of the third locking portion. When the third clamping part elastically deforms too much and the second clamping part has contacted the top wall of the receiving chamber, the second clamping part has a relatively high height, so it is not easy to be deformed, thereby ensuring the structural strength of the connection assembly.

In a second aspect, the present application also provides a battery module, including a plurality of battery cells and an end plate, at least one battery cell and the end plate are connected through the connection assembly of any of the aforementioned schemes.

In some embodiments, the end plate has a groove, and the second connecting member is accommodated behind the groove and fixedly connected with the end plate. By providing the groove, the second connecting member can be quickly positioned on the end plate during assembly, thereby improving connection efficiency.

In some embodiments, the second connector is integral with the end plate. The configuration of the end plate and the second connecting piece as an integral piece can simplify the assembly steps and further improve the assembly efficiency of the battery.

In the third aspect, the present application also provides a battery, including the battery module according to any of the above schemes.

In a fourth aspect, the present application also provides an electric device, including a battery according to any of the above schemes, and the battery is used to provide electric energy for the electric device.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

FIG. 1 is a schematic perspective view of a connection assembly in an unconnected state according to some embodiments of the present application;

FIG. 2 is a schematic perspective view of a connection assembly in a connected state according to some embodiments of the present application;

3 is a schematic perspective view of a battery cell and a battery end plate connected by a connection assembly according to some embodiments of the present application;

FIG. 4 is a schematic top view of a connection assembly in a connected state according to some embodiments of the present application;

Fig. 5 is a schematic cross-sectional view taken along the width direction when the connection assembly is connected according to some embodiments of the present application;

FIG. 6 is a schematic front perspective view of a second party according to some embodiments of the present application;

Fig. 7 is a schematic side perspective view of a second party according to some embodiments of the present application.

In the drawings, the drawings are not drawn to scale.

Mark Description:

connection component 1;

The accommodation cavity 10, the first gap 101, the second gap 102, the third gap 103, the fourth gap 104, the fifth gap 105, the matching part 106, the blocking part 107, the top wall 108 of the containing cavity, and the second opening 109;

The first connecting piece 11, the elastic buckle 110, the first clamping portion 111, the second clamping portion 112, the third clamping portion 113, the threaded hole 114, the first limiting portion 115, the second limiting portion 116, the third limiting portion Position portion 117, the top wall 118 of the first connecting piece, and the connecting portion 119;

The second connecting piece 12, the first opening 120, and the slope 121;

battery cell 2, output pole assembly 20;

End plate 3, groove 30;

The width direction w of the battery cell;

The thickness direction b of the battery cell;

The height direction h of the battery cell.

Detailed ways

The implementation manner of the present application will be further described in detail below with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to illustrate the principles of the application, but not to limit the scope of the application, that is, the application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" and so on are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to this application. Application Restrictions. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

The orientation words appearing in the following description are the directions shown in the figure, and do not limit the specific structure of the application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

At present, with the continuous expansion of the application field of power batteries, the demand for power batteries in the market is also increasing, and the assembly of battery cells is an important part of manufacturing power batteries. How to improve the quality and efficiency of assembly has always been It has always been the goal pursued by the industry.

The applicant noticed that the existing connection method between the battery cell and the battery end plate is to set the base on the battery end plate, and inject the nut and the base into the base by means of metal insert injection molding. Subsequently, the aluminum bars in the battery cells are screwed and fixed with the nuts in the seat by fasteners such as bolts. However, with this connection method, the nut is embedded in the base by injection molding, so that the nut is fixed in the base and cannot move. During the assembly process, if there is an assembly tolerance, it will cause the aluminum bar to be unable to align with the nut component. The threaded holes are difficult to connect with the battery end plate. At the same time, since the battery cell may expand and deform during use, since the nut is fixed in the base, when the battery cell expands and deforms, the deformation force will act on the aluminum bar and/or the fastener In general, if the amount of deformation is large, it may cause damage to the firmness of the connection, or even damage to the battery components.

In order to improve assembly efficiency and at the same time improve the connection quality between battery cells and battery end plates after assembly, the applicant has found that it is possible to connect battery cells and battery end plates by designing a connection component with a new configuration, so that the connected There is still a movable degree of freedom between the battery cell and the battery end plate, thereby solving the aforementioned problems.

The connection assembly, battery module, and battery disclosed in the embodiments of the present application can be used, but not limited, in electric devices such as vehicles, ships, or aircrafts. The power supply system that comprises the connection assembly, battery module, and battery disclosed in this application can be used to form the power device, which is conducive to improving the assembly quality and assembly speed of the battery, thereby improving the stability of battery performance and battery life after assembly.

The embodiment of the present application provides an electric device using a battery as a power source. The electric device can be, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, spaceships, etc.

According to some embodiments of the present application, refer to FIG. 1 and FIG. 2 , and please refer to FIG. 3 further. Figure 1 is a schematic perspective view of a connection assembly in an unconnected state according to some embodiments of the application, Figure 2 is a schematic perspective view of a connection assembly in a connected state according to some embodiments of the application, and Figure 3 is a connection according to some embodiments of the application The three-dimensional schematic diagram of the module after connecting the battery cell and the battery end plate. The present application provides a connecting assembly 1 for connecting a battery cell 2 and an end plate 3 . The connecting assembly 1 includes a first connecting piece 11 and a second connecting piece 12 , the first connecting piece 11 is used to connect to the battery cell 2 , and the second connecting piece 12 is used to connect to the end plate 3 . Wherein, the first one of the first connecting part 11 and the second connecting part 12 has an accommodating cavity 10 , and the second one can be installed in the accommodating cavity 10 . In the connection assembly 1 connecting the battery cell 2 and the end plate 3, the second side installed in the accommodation cavity 10 is in the first side of the accommodation cavity 10 along the width direction w, the thickness direction b and the direction of the battery cell 2. Both the height direction h have an active margin.

As shown in the figure, the w direction shows the width direction w of the battery cell 2 , the b direction shows the thickness direction b of the battery cell 2 , and the h direction shows the height direction h of the battery cell 2 .

A battery cell 2, also known as a cell, is the smallest unit that constitutes a battery module, and its constituent components may include positive pole pieces, negative pole pieces, diaphragms, electrolytes, and packaging of positive pole pieces, negative pole pieces, diaphragms, and electrolytes. Liquid packaging, etc. During the charging and discharging process of the battery, the active ions are intercalated and extracted back and forth between the positive electrode and the negative electrode, and the electrolyte plays the role of conducting ions between the positive electrode and the negative electrode to realize the conversion of electrical energy and chemical energy. Wherein, in some embodiments, each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery.

The end plate 3 is one of the frame structures in the battery module, which is connected to the cell poles in the battery cell, and provides end frame protection and mechanical strength guarantee for the battery cell.

The accommodation chamber 10 is an inner space formed in the first party for accommodating the second party therein, and by keeping the second party accommodated in the accommodation chamber 10, the installation of the first party and the second party is realized.

The active margin refers to the distance between the battery cell 2 and the end plate 3 connected by the first connector 11 and the second connector 12 in the width direction w, thickness direction b, and height direction h of the battery cell 2 . There is a certain degree of freedom of movement, but this freedom of movement will not cause the first connecting member 11 and the second connecting member 12 to move from the connected state to the separated state, that is, the second party installed in the accommodating cavity 10 is on the first side. The accommodating cavity 10 can be moved, but the degree of freedom of movement will not cause the second party to escape from the first party and cause the first connecting part 11 to be separated from the second connecting part 12 .

Referring to FIG. 3 , during the assembly process, the second side of the first connector 11 and the second connector 12 is accommodated in the accommodation chamber 10 of the first side, and then the output pole assembly 20 of the battery cell 2 is connected to the The first connecting piece 11 is connected to realize the connection between the battery cell 2 and the end plate 3. Since there is a margin of movement between the first connecting piece 11 and the second connecting piece 12, during the assembly process, it can be adjusted The relative position between the first connecting piece 11 and the end plate 3 makes it easier for the output pole assembly 20 to be connected to the first connecting piece 11 at a position suitable for installation, so that the assembly tolerance can be absorbed by the movable margin, and the assembly of the battery can be improved. efficiency.

Wherein, the output pole assembly 20 includes a cell pole and an output pole aluminum bar for outputting electric energy, and the first connecting member 11 is connected to the aluminum bar in the output pole assembly 20 .

On the other hand, as the service time of the battery cell 2 increases, it will swell along the width direction w and/or the thickness direction b and/or the height direction h. There is a margin of movement between the parts 12, so that the expansion can be converted into a relative displacement between the first connecting part 11 and the second connecting part 12, while ensuring that the battery cell 2 and the end plate 3 are still in an assembled state On the premise, the damage to the components of the battery cell itself and/or the connecting parts in the battery caused by the expansion of the battery cell 2 is reduced, and the assembly quality is improved.

The first connecting piece and the second connecting piece are provided with a movable margin, so that the assembly tolerance and the expansion of the battery cell can be absorbed by the movable margin, effectively improving the assembly efficiency and assembly quality, and at the same time improving the use of the battery life.

According to some embodiments of the present application, for example, referring to FIGS. 12 has an accommodating cavity 10 , and the first connector 11 connected to the battery cell 2 can be installed in the accommodating cavity 10 . Certainly, for example, in some other embodiments different from those shown in the figure, the first party may also be the first connecting member 11 , and correspondingly, the second party is the second connecting member 12 .

According to some embodiments of the present application, for example, please refer to FIG. 1 to FIG. 3 again, and further refer to FIG. 4 to FIG. 5 . Fig. 4 is a schematic top view of the connection assembly according to some embodiments of the present application, and Fig. 5 is a schematic cross-sectional view of the connection assembly according to some embodiments of the application, cut along the width direction. For example, in the connection assembly 1 connecting the battery cells 2 and the end plates 3, with reference to the direction of the battery cells 2, the second direction is along at least one side in the width direction w, at least one side in the thickness direction b, and There are gaps between at least one side along the height direction h and the inner wall of the accommodating cavity 10 , and the gap provides a movable margin between the first connecting part 11 and the second connecting part 12 . Specifically, in the embodiment shown in Figure 4 and Figure 5, the second side is the first connecting piece 11, along the thickness direction b, there is a first gap 101 between the first connecting piece 11 and the receiving chamber 10, the The first gap 101 allows the first connecting member 11 to be movable in the accommodating cavity 10 along the thickness direction b. Along the width direction w, there is a second gap 102, a third gap 103, and a fourth gap 104 between the first connecting member 11 and the receiving cavity 10, and the second gap 102, the third gap 103, and the fourth gap 104 allow the first The movement of the connecting piece 11 along the width direction w in the accommodating cavity 10 . Along the height direction h, there is a fifth gap 105 between the first connecting member 11 and the receiving chamber 10 , and the fifth gap 105 allows the first connecting member 11 to move in the receiving chamber 10 along the height direction h. As before, only the embodiment in which the second side is the first connecting piece 11 is described, and in the embodiment in which the second side is the second connecting piece, there may be the same or similar distance between the second connecting piece and the accommodating cavity. structure, which will not be repeated here.

By setting the gap, there is a play margin between the first connecting member and the second connecting member, so that the assembly tolerance and the expansion of the battery cells can be absorbed by the play margin.

According to some embodiments of the present application, for example, please refer to FIG. 1 to FIG. 5 again, in the connection assembly 1 connecting the battery cells 2 and the end plates 3, taking the direction of the battery cells 2 as a reference, the second direction is along There are elastic units between at least one side in the width direction w, at least one side in the thickness direction b, and at least one side in the height direction h, and the inner wall of the accommodating chamber 10, and the elastic units can be elastically deformed under the action of an external force, The deformation amount of this elastic deformation provides a play margin.

The elastic unit may be any elastically deformable unit, such as a unit made of rubber, a coil spring, and the like. Specifically in FIG. 4 , the second side is the first connecting piece 11, and there is an elastic buckle 110 between the first connecting piece 11 and the inner wall of the accommodating cavity 10. When a force along the width direction w is applied, the elastic buckle 110 can After abutting against the inner wall of the accommodating chamber 10, it is elastically deformed along the width direction w to provide a movable margin. When receiving a force along the thickness direction b, the elastic buckle 110 can be elastically deformed along the thickness direction b after abutting against the inner wall of the receiving chamber 10 to provide a movable margin. Specifically in FIG. 5 , the second party is the first connecting piece 11 , and the first connecting piece 11 has a third clamping portion 113 . After offsetting, elastically deform along the height direction h to provide a margin of activity. As before, only the embodiment in which the second side is the first connecting piece 11 is described, and in the embodiment in which the second side is the second connecting piece, there may be the same or similar distance between the second connecting piece and the accommodating cavity. structure, which will not be repeated here.

By arranging the elastically deformable elastic unit, the movable margin between the first connecting member and the second connecting member can be absorbed by allowing the assembly tolerance and the expansion of the battery cell.

According to some embodiments of the present application, at least one side along the width direction w, at least one side along the thickness direction b, and at least one side along the height direction h of the second side have a gap with the inner wall of the accommodating chamber 10 And the elastic unit, specifically in Fig. 4 to Fig. 5, the second side is the first connecting piece 11, along the thickness direction b, there is a first gap 101 and an elastic buckle 110 between the first connecting piece 11 and the receiving cavity 10, Along the width direction w, there is a second gap 102, a third gap 103, a fourth gap 104 and an elastic buckle 110 between the first connecting member 11 and the receiving cavity 10; along the height direction h, the first connecting member 11 and the receiving cavity There is a fifth gap 105 and a third locking portion 113 between 10 . When the second party moves to a certain position in the accommodation chamber 10, the aforementioned one or more gaps have been absorbed by the aforementioned action, at this time, an additional activity margin can be provided by setting the elastic member, so that the connecting assembly can Absorbs larger assembly tolerances and expansion of battery cells. As before, only the embodiment in which the second side is the first connecting piece 11 is described, and in the embodiment in which the second side is the second connecting piece, there may be the same or similar distance between the second connecting piece and the accommodating cavity. structure, which will not be repeated here.

According to some embodiments of the present application, for example, please refer to FIG. 1 to FIG. 5 , the second side has a threaded hole 114 , and the second side is connected to the output pole assembly 20 of the battery cell 2 through bolts. Wherein, at least a part of the inner wall of the accommodation chamber 10 restricts the rotation of the second party, so that the second party will not rotate in the accommodation chamber 10 during the process of assembling the bolts. In some other suitable implementation manners, other suitable methods such as welding or riveting may be used between the output pole assembly and the second party, and at this time, there is no need to restrict the rotation of the second party in the accommodation cavity 10 .

According to some embodiments of the present application, for example, refer to FIG. 4 and FIG. 5 , and please further refer to FIG. 6 , FIG. 6 is a front perspective view of the second party according to some embodiments of the present application; the second party is the first connection Take piece 11 as an example, the first connecting piece 11 has stoppers, and the stoppers are arranged in pairs on both sides of the width direction w of the first connecting piece 11 in the connected state, and in the width direction w, the first connecting piece On the same side of the piece 11, the stoppers are configured as three respectively arranged at both ends and the middle of the first connecting piece 11: the first stopper 115, the second stopper 116 and the third stopper in sequence 117. The inner wall of the accommodating chamber 10 has a matching portion 106 corresponding to each limiting portion. In the embodiment shown in the figure, the matching portion 106 is the inner wall surface of the accommodating chamber 10. Of course, in some other suitable embodiments, the matching portion 106 It may be a concavo-convex structure formed in the inner wall of the accommodating chamber 10 . When the first connecting part 11 has a tendency to rotate in the receiving cavity 10 , the limiting part first contacts the matching part 106 to limit the rotation of the first connecting part 11 . In the embodiment where the second party is the second connecting part, the structure between the second connecting part and the receiving cavity may be the same as or similar to that described above, which will not be repeated here.

By arranging three limiting portions on the same side of the first connecting member 11 in the width direction w, the anti-rotation effect can be improved.

According to some embodiments of the present application, for example, referring to FIG. 1 , taking the first side as the second connector 12 and the second side as the first connector 11 as an example, the thickness direction b of the second connector 12 in the connected state The upper sidewall has a first opening 120 , which allows the first connecting piece 11 to be inserted into the receiving cavity 10 . Wherein, the first connecting member 11 has an elastic buckle portion 110 , and the accommodating cavity 10 has a blocking portion 107 . When the second connecting piece 12 is inserted into the receiving cavity 10 , the elastic buckle 110 will contact the blocking portion 107 and be deformed by the blocking portion 107 . After the second connecting piece 12 is inserted into the accommodating cavity 10, the elastic buckle 110 is elastically reset. At this time, when the second connecting piece 12 is about to come out of the accommodating cavity 10, the blocking portion 107 will be against the elastic buckle 110, The second connecting member 12 is restrained from coming out of the accommodating cavity 10 by cooperation. In the embodiment in which the first connection part is the first connection part and the second connection part is the second connection part, the structure between the second connection part and the accommodating cavity may be the same as or similar to that described above, which will not be repeated here.

By arranging the elastic buckle 110 and the stopper, the first connecting piece 11 and the second connecting piece 12 can be assembled and connected in a snap-fit manner, which is convenient for disassembly. At the same time, it is easy to realize the position limitation of the second party in the receiving chamber 10 in the assembled state, and prevent the first connecting part 11 and the second connecting part 12 from disassembling the assembled state after it is disengaged.

According to some embodiments of the present application, for example, please refer to FIG. 1 , the entrance of the first opening 120 is flared. The inner diameter gradually decreases. It is specifically formed between the slopes 121 at the entrance of the first opening 120 .

By setting the first opening 120 with a flaring structure, when the second party is inserted into the receiving cavity 10, the inclined surface 121 can contact the elastic buckle 110 on the second side and guide the deformation of the elastic buckle 110, to facilitate the insertion process.

According to some embodiments of the present application, for example, please refer to FIG. 1, FIG. 2 and FIG. 108 has a second opening 109, and the first connector 11 has a first clamping portion 111 and a second clamping portion 112, referring to the direction in which the connection assembly 1 and the battery cell 2 are connected, the first clamping portion 111 and the second clamping portion 112 The card parts 112 are arranged at intervals along the height direction h. After the first connector 11 is accommodated in the accommodation chamber 10, the top surface of the first connector 11 is exposed in the accommodation chamber 10, along the height direction h, the first clamping part 111 and the second clamping part 112 are respectively located on the top wall of the housing chamber 10 108 sides.

When the first connecting piece 11 in the accommodating chamber 10 has a tendency to move along the height direction h, the first locking portion 111 and the second locking portion 112 will abut against the top wall 108 to limit the height of the first connecting piece 11. The range of movement in the direction h limits the first connecting member 11 from coming out of the accommodating cavity 10 . In the embodiment in which the first connection part is the first connection part and the second connection part is the second connection part, the structure between the second connection part and the accommodating cavity may be the same as or similar to that described above, which will not be repeated here.

By configuring the distance between the first clamping part 111 and the second clamping part 112 in the height direction h, it is possible to ensure that the first connecting part 11 has a certain degree of freedom of movement along the height direction h, and at the same time, the first connecting part 11 can be adjusted. Positioning, at the same time, the top surface of the first connecting member 11 is exposed to the accommodating cavity 10 , so as to facilitate the connection with the battery cell 1 .

According to some embodiments of the present application, for example, referring to FIG. 1 , FIG. 2 and FIG. 6 , it is taken that the first party is the second connecting member 12 and the second party is the first connecting member 11 as an example. The first connector 11 has a top wall 118, and the first clamping portion 111 is provided with the top wall 118, that is, referring to the direction in which the connection assembly 1 and the battery cell 2 are connected, the first clamping portion 111 is from the top along the width direction w. The wall 118 extends toward two sides of the first connecting member 11 . The first connecting member 11 further includes a third locking portion 113 and a connecting portion 119 . The connecting portion 119 connects the third clamping portion 113 and the top wall 118 of the first connecting member 11, the third clamping portion 113 protrudes from the connecting portion 119 toward both sides in the width direction w, the third clamping portion 113 is configured as an elastic unit, Specifically, it may be made of elastically deformable materials such as rubber. Wherein, as shown in FIG. 6 , according to some embodiments of the present application, specifically, the second limiting portion 116 is a side wall of the connecting portion 119 , and the elastic buckle 110 is disposed on the connecting portion 119 .

When the connection assembly 1 is connected to the battery cell 2 , the third clamping portion 113 can abut against the top wall 108 of the accommodating cavity 10 , so that the third clamping portion 113 and the first clamping portion 111 can contact the top wall 108 of the accommodating cavity 10 Perform elastic locking to improve the firmness of the connection state. At the same time, when the first connecting member 11 moves away from the second connecting member 12 along the height direction h, the third locking portion 113 can be elastically deformed to provide a movable margin for the displacement of the first connecting member 11 . In the embodiment in which the first connection part is the first connection part and the second connection part is the second connection part, the structure between the second connection part and the accommodating cavity may be the same as or similar to that described above, which will not be repeated here.

According to some embodiments of the present application, for example, please refer to FIG. 7 , which is a schematic side perspective view of the second party according to some embodiments of the present application. In the cross-section of the third clamping portion 113 and the connecting portion 119, there is an included angle less than 90° between the third clamping portion 113 and the connecting portion 119, so that the third clamping portion 113 is warped towards the top wall 108 of the accommodating cavity 10 When the first connecting part 11 moves away from the second connecting part 12 along the height direction h, the outer edge 1131 of the third locking part 113 first contacts with the top wall 108 of the accommodating cavity 10 . Wherein, the third clamping portion 113 is configured as a cantilever structure, which means that the third clamping portion 113 is an arm body extending along the thickness direction b, and is connected by a connecting portion 119, from the top wall 118 of the first connecting member 11 overhang. The free side of the cantilever structure is configured as the longest side of the cantilever, that is, the outer edge 1131 of the third locking portion 113 is the longest side of the third locking portion 113 .

Since the outer edge 1131 of the third clamping portion 113 is first in contact with the top wall 108 of the accommodating cavity 10 when moving, it can be configured as the longest side in the third clamping portion 113 to make the third clamping portion 113 and the accommodating cavity 10 There are more contact points when the top wall 108 is in contact, so that the third clamping portion 113 is more likely to be elastically deformed under the action of external force, providing a movable margin between the first connecting member 11 and the second connecting member 12 . In the embodiment in which the first connection part is the first connection part and the second connection part is the second connection part, the structure between the second connection part and the accommodating cavity may be the same as or similar to that described above, which will not be repeated here.

According to some embodiments of the present application, for example, please refer to FIG. 7 again, taking the direction in which the connection assembly 1 is connected to the battery cell 2 as a reference, along the height direction h, the height of the second clamping portion 112 is greater than that of the third clamping portion 113 in height.

When the elastic deformation of the third clamping part 113 is too much and the second clamping part 112 has been against the top wall 108 of the receiving chamber 10, the second clamping part 112 has a relatively large height, so it is not easy to deform, thereby ensuring the connection. Structural Strength of Component 1.

According to some embodiments of the present application, the present application also provides a battery module, the battery module includes a plurality of battery cells 2 and end plates 3, and the plurality of battery cells are combined in series and/or in parallel to form a battery module. Wherein at least one battery cell 2 is connected to the end plate 3 through the connection assembly described in any of the preceding schemes.

According to some embodiments of the present application, for example, please refer to FIG. 3 , the end plate 3 has a groove 30 , and the second connecting member 12 is accommodated behind the groove 30 and fixedly connected with the end plate 3 . Wherein, the second connecting member 12 and the end plate may be fixedly connected by means including but not limited to welding, riveting or bolting.

By providing the groove 30, the second connecting member 12 can be quickly positioned on the end plate 3 during assembly, and the connection efficiency can be improved.

According to some embodiments of the present application, for example, the end plate 3 and the second connecting member 12 are integrated, which means that the end plate 3 and the second connecting member 12 are made of the same blank or raw material, including but not limited to A one-piece structure formed by one-piece molding processes such as machining, casting molding, or additive manufacturing.

The configuration of the end plate 3 and the second connecting member 12 in an integral form can simplify the assembly steps and further improve the assembly efficiency of the battery.

According to some embodiments of the present application, the present application also provides a battery, including the battery module described in any of the above solutions.

According to some embodiments of the present application, the present application also provides an electric device, including the battery described in any of the above schemes, and the battery is used to provide electric energy for the electric device.

The electric device may be any of the aforementioned devices or systems using batteries.

According to some embodiments of the present application, please refer to FIG. 1 to FIG. 7 , a connection assembly 1 for connecting battery cells 2 and end plates 3 is provided. A connecting piece 11 and a second connecting piece 12 for connecting to the end plate 3 . The second connecting part 12 has an accommodating cavity 10 therein, and the first connecting part 11 can be accommodated in the accommodating cavity 10 . In the connection assembly 1 that connects the battery cell 2 and the end plate 3, the first connector 11 installed in the accommodating cavity 10 has leeway along the width direction w, thickness direction b, and height direction h of the battery cell 2. The amount is used to absorb the expansion of the battery cell 2 and the tolerance in the assembly process. Specifically, along the width direction w, there is a second gap 102, a third gap 103, and a fourth gap 104 between the first connecting member 11 and the receiving cavity 10, and an elastically deformable elastic buckle 110 . The second gap 102 , the third gap 103 , and the fourth gap 104 together with the elastic deformation of the elastic buckle 110 provide a movable margin of the first connecting member 11 along the width direction w. Along the thickness direction b, there is a first gap 101 between the first connecting member 11 and the receiving cavity 10, and the elastic buckle 110 is also arranged between the first connecting member 11 and the receiving cavity 10 in the thickness direction b, the first gap 101 and the elastic deformation of the elastic buckle 110 jointly provide a movable margin of the first connecting member 11 along the thickness direction b. Along the height direction h, there is a fifth gap 105 between the first connecting piece 11 and the receiving cavity 10 , and the first connecting piece 11 also has an elastically deformable third clamping portion 113 , the fifth gap 105 and the third clamping portion 113 The amount of elastic deformation together provides the movable margin of the first connecting member 11 along the height direction h. By setting the aforementioned movable margin, it is possible to use it to absorb assembly tolerances during the assembly process and simplify the assembly process. And it can absorb the expansion of the battery core during use. At the same time, the first connecting piece 11 has a threaded hole 114, and the output pole assembly 20 of the battery cell 2 is connected to the first connecting piece 11 by bolts. In the width direction w, on the same side of the first connecting piece 11, the first connecting piece The part has a first limiting part 115, a second limiting part 116 and a third limiting part 117, which are respectively connected to the inner wall of the accommodating cavity 10 during the bolt assembly process, so as to prevent the first The connecting piece 11 rotates in the accommodating chamber 10 . Wherein, the first limiting portion 115 may be a convex portion provided on the first connecting member as shown in the figure, and correspondingly, the inner wall of the accommodating cavity 10 is configured as a groove.

Those skilled in the art should understand that the above-mentioned embodiments are illustrative rather than restrictive. Different technical features in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other modified embodiments of the disclosed embodiments on the basis of studying the drawings, specification and claims. In the claims, the term "comprising" does not exclude other means or steps; when an item is not modified with a quantitative word, it is intended to include one/more/kind of item, and can be used with "one/more/kind of item" "Use interchangeably"; the terms "first" and "second" are used to indicate names but not to indicate any specific order. Any reference signs in the claims shall not be construed as limiting the scope of protection. The functions of multiple parts appearing in the claims can be realized by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

A connection assembly for connecting battery cells and end plates, comprising:

a first connector for connecting to the battery cell; and

a second connecting piece for connecting to the end plate;

Wherein, the first one of the first connector and the second connector has an accommodation chamber, and the second one can be installed in the accommodation cavity, and the battery cell and the end plate are connected. In the connection assembly, the second party has a margin of movement in the accommodation cavity along the width direction, thickness direction and height direction of the battery cell.
The connection assembly of claim 1, wherein the first party is the second connection member and the second party is the first connection member.
The connection assembly according to claim 1, wherein, in the connection assembly connecting the battery cells and the end plates, the second side is along at least one side of the width direction, along the There are gaps between at least one side in the thickness direction and at least one side in the height direction and the inner wall of the accommodating cavity, and the gaps provide the movable margin.
The connection assembly according to claim 1, wherein, in the connection assembly connecting the battery cells and the end plates, the second side is along at least one side of the width direction, along the At least one side in the thickness direction and at least one side in the height direction are respectively provided with elastic units between the inner wall of the accommodating cavity, and the elastic units can be elastically deformed under the action of an external force, and the deformation of the elastic deformation amount to provide the activity margin.
The connection assembly according to claim 1, wherein the second side has a threaded hole, and the second side is connected to the output pole assembly of the battery cell through bolts;

Wherein, at least a part of the inner wall of the accommodating cavity restricts the rotation of the second party.
The connection assembly according to claim 5, wherein the second side has limiting parts, and the limiting parts are arranged in pairs on both sides of the second side in the width direction in the connected state , and the position-limiting parts on the same side are configured as three respectively arranged at both ends and the middle part of the second side, and the inner wall of the accommodating cavity has a matching part corresponding to each of the position-limiting parts;

Wherein, when the second party has a tendency to rotate in the accommodating cavity, the limiting part first contacts with the matching part, so as to limit the rotation of the second party.
The connection assembly according to claim 1, wherein the side wall in the thickness direction of the first party in the connected state has a first opening, the first opening allows the second party to be inserted into the in the chamber;

Wherein, the second side has an elastic buckle, and the accommodating cavity has a stopper, during the insertion process, the elastic buckle is squeezed and deformed by the stopper, and after the insertion, the elastic buckle returns elastically , and cooperate with the blocking portion to restrict the second party from coming out of the accommodating cavity.
The connection assembly according to claim 7, wherein the inlet of the first opening is flared.
The connection assembly according to claim 1, wherein the top wall of the accommodating cavity has a second opening, the second side has a first clamping portion and a second clamping portion, the first clamping portion and the second clamping portion The two clamping parts are arranged at intervals along the height direction in the connected state;

Wherein, after the second party is installed in the accommodating cavity, the top surface of the second party is exposed in the accommodating cavity, and along the height direction, the first clamping part and the second clamping part are respectively Located on both sides of the top wall of the accommodating cavity, to restrict the second party from coming out of the second opening along the height direction.
The connection assembly according to claim 9, wherein the second side has a top wall, the first clamping portion is disposed on the top wall of the second side, and the second side further comprises:

a third locking portion protruding toward both sides of the second party in the width direction in a connected state; and

a connecting part, connecting the third locking part and the top wall of the second side;

Wherein, the third locking portion is an elastic unit.
The connection assembly according to claim 10, wherein, in the cross section of the third clamping portion and the connecting portion, the included angle between the third clamping portion and the connecting portion is less than 90°;

Wherein, the third locking part is a cantilever, and the free side of the cantilever is configured as the longest side of the cantilever.
The connection assembly according to claim 10, wherein, along the height direction in the connected state, the height of the second clamping portion is greater than the height of the third clamping portion.
A battery module, comprising a plurality of battery cells and an end plate, wherein at least one of the battery cells is connected to the end plate through the connection assembly according to any one of claims 1 to 12.
The battery module according to claim 13, wherein the end plate has a groove, and the second connecting member is accommodated behind the groove and fixedly connected to the end plate.
The battery module according to claim 13, wherein the second connection member is integral with the end plate.
A battery, comprising the battery module according to any one of claims 13-15.
An electric device, wherein the electric device comprises the battery according to claim 16, and the battery is used for providing electric energy.