CN221057627U - Connection assembly, battery and power utilization device - Google Patents

Abstract

The application relates to the technical field of batteries and discloses a connecting assembly, a battery and an electric device. The connection assembly includes: a busbar, an adapter and an acquisition harness; the bus bars are used for electrically connecting a plurality of battery cells which are stacked; the adapter is provided with a first connecting sheet, a second connecting sheet and a flexible connecting section, wherein the first connecting sheet is electrically connected with the busbar; the flexible connecting section is connected with the first connecting sheet and the second connecting sheet; the acquisition wire harness is connected with the second connecting sheet; the first connecting piece and the second connecting piece have a displacement difference in a stacking direction along the plurality of battery cells. The connecting component provided by the application is used for electrically connecting the battery cell and the battery management system.

Description

Connection assembly, battery and power utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a connecting assembly, a battery and an electric device.

Background

New energy batteries are increasingly used in life and industry, for example, new energy vehicles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like.

The battery is generally provided with a component for sampling the temperature, voltage, etc. of the battery cells. In the related art, the flexible flat cable is adopted, and is lapped on the busbar after being bent, but because the flexible flat cable has rebound phenomenon after being bent, the flexible flat cable is easy to displace in the process of connecting the flexible flat cable and the busbar, and thus, the flexible flat cable is unfavorable for mass automatic production of sampled assemblies.

Disclosure of utility model

The application provides a connecting component, a battery and an electric device, which can improve the production efficiency and the reliability of the connecting component in the battery.

A first aspect of the present application provides a connection assembly comprising: a busbar, an adapter and an acquisition harness; the bus bars are used for electrically connecting a plurality of battery cells which are stacked; the adapter is provided with a first connecting sheet, a second connecting sheet and a flexible connecting section, wherein the first connecting sheet is electrically connected with the busbar; the flexible connecting section is connected with the first connecting sheet and the second connecting sheet; the acquisition wire harness is connected with the second connecting sheet; wherein, in along the stacking direction of a plurality of battery single bodies, first connection piece has displacement difference with the second connection piece.

The connecting component comprises the bus bar, so that the battery cells can be connected in series or in parallel through the bus bar and the poles of the battery cells; the collection wiring harness is arranged and can be electrically connected with the battery management system through the collection wiring harness; and meanwhile, the busbar is electrically connected with the acquisition wire harness through the adapter, and the battery cell can be electrically connected with the battery management system so as to realize sampling of the temperature, the voltage and the like of the battery cell. Because the adapter is arranged, the collecting wire harness does not need to be bent in the process of manufacturing and processing the connecting assembly, so that the collecting wire harness is directly connected with the bus bar, the adapter is electrically connected with the corresponding position on the collecting wire harness, and the adapter is electrically connected with the bus bar. Like this, in the in-process of production, can all place collection pencil, adaptor and busbar at the equipment station that corresponds can, the condition that does not have the atress between the three to can not take place relative movement, then can carry out the electricity through automatic mode to adaptor and collection pencil and be connected, carry out the electricity to adaptor and busbar and be connected, and then can improve this coupling assembling's production efficiency.

Meanwhile, the adapter in the connecting assembly is arranged to be in a structure form comprising a first connecting sheet and a second connecting sheet, and connection points can be provided through the first connecting sheet and the second connecting sheet respectively so as to electrically connect the adapter with the bus bar through the first connecting sheet and electrically connect the adapter with the acquisition wire harness through the second connecting sheet; the first connecting piece is connected with the second connecting piece through the flexible connecting section, so that the battery monomer can be electrically connected with the acquisition wire harness; and the first connecting piece and the second connecting piece are arranged in a structure form with displacement difference along the stacking direction of the plurality of battery cells. When the connecting assembly provided by the application is applied to a battery, the collecting wire harness extends along the stacking direction of a plurality of battery monomers, in the process of the movement of the battery monomers relative to the collecting wire harness, the displacement difference of the first connecting piece and the second connecting piece in the stacking direction of the plurality of battery monomers can be used for counteracting the distance generated by the movement of the battery monomers relative to the collecting wire harness, and the first connecting piece and the second connecting piece are connected through the flexible connecting section, so that the adapter is convenient to deform under the condition that the first connecting piece and the second connecting piece generate relative movement, and the stress generated on the adapter is reduced, thereby reducing the risk that the adapter is pulled apart due to the fact that the adapter is subjected to external force; and can reduce the tie point of adaptor and busbar, the tie point fracture of adaptor and collection pencil and the risk of inefficacy, and then can improve this coupling assembling's reliability.

In one possible implementation of the application, the flexible connection section has a fusing part on a portion thereof adjacent to the first connection piece or adjacent to the second connection piece; under the condition that the current flowing through the flexible connecting section is larger than the preset current, the fusing part fuses to disconnect the first connecting sheet and the second connecting sheet.

Because be provided with the fusing portion on the flexible connection section, under the circumstances that the electric current that flows through the adaptor exceeds the maximum current that the fusing portion can bear, the fusing portion can take place the fusing voluntarily to can break the connection between first connection piece and the second connection piece, and then can break through the battery monomer and the collection pencil that the adaptor electricity is connected, in order to reduce battery monomer and other devices that are connected with the collection pencil and take place danger because of electric current overload.

In one possible implementation of the present application, the flexible connection section includes a flexible section, a first extension section, and a second extension section, the flexible section is connected to the first connection piece through the first extension section, and the flexible section is connected to the second connection piece through the second extension section; the fusing part is positioned on the first extension section or the second extension section.

Because the flexible connecting section comprises the flexible section, the flexible section can rapidly generate deformation along the direction of external force under the condition that the adapter is subjected to the external force, so that the stress generated on the adapter is reduced, and the risk that the adapter is pulled apart can be reduced; simultaneously, be connected flexible section and first connection piece through first extension section, be connected flexible section and second connection piece through the second extension section, under the circumstances that flexible section produced the deformation, through the buffering of first extension section and second extension section, can reduce the influence that first connection piece and second connection piece received, just also can reduce the risk of the tie point fracture of first connection piece and second connection piece. Simultaneously, set up the fusing portion on first extension section or second extension section, because the deflection of first extension section and second extension section is little, can reduce the fusing portion and produce the crack under the effect of external force, even take place cracked risk.

In one possible embodiment of the application, the projection of the flexible section is curved in the plane of the second connecting piece.

Because the flexible section is arranged into a bending structure, the extension length of the flexible section can be increased, and the length of the flexible connecting section can be increased, so that the flexible connecting section can generate larger deformation under the condition that the flexible connecting section is deformed, and the stress of pulling can not be generated between the first connecting sheet and the second connecting sheet.

In one possible implementation manner of the application, the second connecting piece is provided with a filling connecting hole, the protective film of the collecting wire harness is provided with a notch matched with the second connecting piece, the second connecting piece is arranged at a position corresponding to the notch, and the second connecting piece is electrically connected with the wire in the collecting wire harness exposed through the notch through the filling connecting hole.

Because the second connecting piece is provided with the filling connecting hole, and the acquisition wire harness is provided with the notch corresponding to the second connecting piece, a part of the wires in the acquisition wire harness can be exposed out through the notch; under the condition that the second connecting piece is electrically connected with the collection wire harness, the second connecting piece and the wires in the collection wire harness can be positioned through the filling connection Kong Xian, and then the second connecting piece and the wires can be welded through the filling connection holes, so that the welding area between the second connecting piece and the wires can be connected Kong Zengjia through filling, and the connection strength between the second connecting piece and the collection wire harness can be improved.

In one possible embodiment of the application, the width of the second connecting piece in the radial direction of the wires is smaller than the center distance of the two wires.

Since the width of the second connection piece is set smaller than the center distance of the two wires, the risk of contact between the second connection piece and the adjacent wires can be reduced.

In one possible embodiment of the application, the width of the second connecting piece in the radial direction of the wires is less than or equal to seven tenths of the center distance of the two wires.

The width of the second connecting sheet is less than or equal to seven tenths of the center distance of the two wires, so that the risk of contact between the second connecting sheet and the adjacent wires can be reduced, and the second connecting sheet and the corresponding wires can be electrically connected conveniently.

In one possible embodiment of the application, the width of the second connecting piece in the radial direction of the wires is equal to the distance of the gap between the two wires.

Because the width of the second connecting piece is equal to the distance of the gap between the two wires, the second connecting piece and the two wires adjacent to the wires can have a longer distance under the condition of electrically connecting the second connecting piece with the corresponding wires in the acquisition wire harness.

In one possible implementation manner of the application, the second connecting piece and the position corresponding to the notch on the acquisition wire harness are both provided with protective layers, and the protective layers are made of insulating materials.

Because the second connecting sheet and the notch on the acquisition wire harness are provided with the insulating protective layers, on one hand, the second connecting sheet can be subjected to insulating treatment, and the notch on the acquisition wire harness is sealed so as to perform insulating treatment on the exposed wires in the acquisition wire harness; on the other hand, the connection between the second connecting sheet and the collection wiring harness can be reinforced through the protective layer, so that the risk of failure caused by connection cracking of the second connecting sheet and the wires in the collection wiring harness is reduced.

In one possible implementation of the application, the flexible connection section is coated with an insulating layer, which is a flexible material.

Due to the insulating layer arranged on the flexible connecting section, the risk of short circuit between the flexible connecting section and other adjacent devices in the adapter can be reduced. Meanwhile, the insulating layer is made of flexible materials, on one hand, the strength and toughness of the flexible connecting section can be enhanced through the flexible insulating layer, so that the risk of fracture of the flexible connecting section under the condition of pulling force is reduced, and meanwhile, the risk of fracture of the flexible connecting section under the condition of vibration of the adapter is reduced; on the other hand, the flexible connecting section is easier to deform, and stress is not formed on the flexible connecting section.

In one possible implementation of the application, the insulating layer extends from the flexible connection section to the first connection piece and the second connection piece and covers a portion of the first connection piece adjacent the flexible connection section and a portion of the second connection piece adjacent the flexible connection section.

Because extend the insulating layer to first connection piece and second connection piece on, can strengthen and stabilize the connection of first connection piece and flexible connection section through the insulating layer, strengthen and stabilize the connection of second connection piece and flexible connection section through the insulating layer, make the connection of the thinner flexible connection section of two relative connection pieces and two connection pieces more firm to reduce flexible connection section under the circumstances that produces the deformation, by the fracture risk that pulls and take place, and can fix the shape of flexible connection section better through the insulating layer.

A second aspect of the present application provides a battery comprising: a battery cell and a connection assembly provided in any one of the first aspects above; wherein, the battery cell has a pole; the bus bars in the connection assembly are electrically connected with the poles.

Due to the fact that the connecting component is arranged in the battery, the arrangement position of the collection wiring harness can be determined according to the stacking mode of the battery monomers, and the battery monomers can be connected in series or in parallel through the bus bars in the connecting component and the pole posts on the battery monomers. Compared with the mode of directly electrically connecting the acquisition wire harness with the battery cells in the related art, the application can determine the connection position of the adapter and the acquisition wire harness according to the stacking mode of the battery cells and the connection position of the adapter and the bus bar, so that the connection point position of each adapter and the adapter on the acquisition wire harness can be processed, each adapter and the acquisition wire harness can be electrically connected first, and then the acquisition wire harness connected with the adapter is arranged at the position corresponding to the battery cells so as to electrically connect the bus bar and the first connecting piece. Therefore, as the connection position of each adapter and the collection wire harness is fixed, the connection of the adapter and the collection wire harness can be completed through automatic equipment, and then the connection of the bus bar connected with the adapter and the pole on the battery cell can be completed through automatic equipment, so that the production efficiency can be improved.

In one possible implementation manner of the present application, in a stacking direction along the plurality of battery cells, the first connection piece is closer to the center of the battery cell than the second connection piece, and a displacement difference between the first connection piece and the second connection piece is positively correlated with a displacement distance of the pole, where the displacement distance of the pole is a movement distance generated by the pole relative to the second connection piece when the battery cell expands.

Because the first connecting piece of the adapter is arranged at the position closer to the center of the battery cell relative to the second connecting piece, under the condition that the battery cell expands, the first connecting piece can move relative to the second connecting piece, the flexible connecting section on the adapter can deform, and the deformation of the adapter caused by the expansion of the battery cell can be counteracted through the displacement difference between the first connecting piece and the second connecting piece, so that the risk that the adapter is pulled due to the expansion of the battery cell can be reduced. Meanwhile, the displacement difference of the first connecting piece and the second connecting piece is determined according to the expansion amount of the battery monomer, and the displacement difference of the first connecting piece and the second connecting piece is positively correlated with the expansion amount of the battery monomer, so that the risk that the adapter is pulled due to the fact that the movement distance of the first connecting piece relative to the second connecting piece caused by the expansion of the battery monomer is larger than the displacement difference can be reduced.

In one possible implementation of the application, the battery comprises at least two battery cells; the first connecting piece in each adapter piece is closer to the center of at least two battery cells than the second connecting piece in the stacking direction of at least two battery cells.

In the case of at least two battery cells in the battery, the first connecting piece in each adapter is arranged at a position closer to the center of the at least two battery cells than the second connecting piece, and when the battery cells expand in the stacking direction of the battery cells, the staggering direction of the first connecting piece of each adapter relative to the second connecting piece is opposite to the moving direction of each pole, so that the first connecting piece can move relative to the second connecting piece in the direction opposite to the staggering direction.

In one possible implementation of the present application, the displacement difference between the first connecting piece and the second connecting piece in the stacking direction of the at least two battery cells is greater than or equal to a first distance, where the first distance is half of the movement distance generated by the polar post on each battery cell relative to the center of the at least two battery cells when each battery cell expands.

Because the displacement difference between the first connecting piece and the second connecting piece is larger than or equal to the first distance, the first connecting piece can move from one side of the second connecting piece to the other side of the second connecting piece under the condition that the battery monomer expands, so that the influence of the expansion of the battery monomer on the adapter can be adapted to the maximum extent.

A third aspect of the application provides an electrical device comprising a battery of any one of the above second aspects for providing electrical energy.

Because the electric device comprises the connecting component provided by the first aspect, the reliability of connection between the battery unit and the acquisition wire harness can be improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

Fig. 1 is a schematic structural view of a battery provided by the present application;

FIG. 2 is an enlarged view of a portion A of FIG. 1 in accordance with the present application;

FIG. 3 is a schematic view of an adaptor in a connection assembly according to the present application;

FIG. 4 is a schematic view of the structure of the adapter and collection harness in the connection assembly provided by the present application;

Fig. 5 is an enlarged view of part B of fig. 1 provided by the present application.

Reference numerals illustrate:

1-a battery cell; 11-pole; 2-bus bars; 3-collecting wire harnesses; 31-notch; 4-an adapter; 41-a first connecting piece; 42-a second connecting piece; 421-filling the connection hole; 43-flexible connection section; 431-flexible section; 432-a first extension; 433-a second extension; 44-an insulating layer; a 5-connector; c-a first direction; d-stacking direction; e-width of the second connecting piece; f-displacement difference.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" generally indicates that the associated object is an "or" relationship.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. are orientation or positional relationship based on the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, and are not intended to indicate or imply that the apparatus or element in question must have a specific orientation, be constructed, operated, or used in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.

The present application will be described in detail below.

At present, new energy batteries are increasingly widely applied to life and industry. The new energy battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and a plurality of fields such as aerospace. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In many application scenarios, in order to realize intelligent management of a Battery, reduce occurrence of overcharge and overdischarge conditions of the Battery, prolong service life of the Battery, monitor a state of the Battery, and generally configure a Battery management system (Battery MANAGEMENT SYSTEM, BMS) for the Battery, and control a protection switch through a BMS. And the BMS is electrically connected with the battery cells, typically through a sampling structure.

In the related art, a flexible circuit board (Flexible Printed Circuit, FPC) or a flexible flat cable (Flexible Flat Cable, FFC) is generally used, one end of a wire in the FPC or FFC is connected to a battery cell, the other end is connected to a connector, and then connected to the BMS through the connector. The mode that FPC or FFC is directly connected with the battery monomer's utmost point post is adopted, because FPC or FFC is comparatively soft, is carrying out the in-process of welding to its and battery monomer, is difficult for carrying out the wire to FPC or FFC and fix a position for the feasibility of large batch automated production is relatively poor, and assembly efficiency is low.

An embodiment of the present application provides a connection assembly, referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a battery provided by the present application, and fig. 2 is a partially enlarged view of a portion a in fig. 1 provided by the present application. The connection assembly includes: a busbar 2, an acquisition harness 3 and an adapter 4; wherein the bus bar 2 is used for electrically connecting a plurality of stacked battery cells 1; the adapter 4 has a first connecting piece 41, a second connecting piece 42 and a flexible connecting section 43, the first connecting piece 41 being electrically connected to the busbar 2; the flexible connection section 43 connects the first connection piece 41 and the second connection piece 42; the acquisition wire harness 3 is connected with the second connecting sheet 42; the first connecting piece 41 and the second connecting piece 42 have a displacement difference F in the stacking direction D of the plurality of battery cells 1.

The busbar 2 in the embodiment of the present application may be manufactured using a metal substrate such as copper or aluminum. The bus bar 2 may be used to electrically connect the poles 11 on the battery cells 1. For example, a plurality of stacked battery cells 1 may be connected in series or in parallel by a bus bar 2.

The collection harness 3 in the embodiment of the present application may employ an FPC or an FFC, and a connector 5 is provided at one end of the FPC or the FFC to electrically connect the FPC or the FFC with the BMS through the connector 5. Each of the leads in the FFC is electrically connected to one of the bus bars 2, and each of the battery cells 1 may be electrically connected to the BMS. Since it is necessary to electrically connect the battery cells 1 and the BMS through the collection wire harness 3, the collection wire harness 3 is generally of a long-strip-shaped structure, and as shown in fig. 1, the long-strip-shaped collection wire harness 3 is extended and unfolded along the stacking direction D of the plurality of battery cells 1, and the plurality of battery cells 1 can be electrically connected with the BMS through the collection wire harness 3.

The adaptor 4 in the embodiment of the present application may be manufactured by using a metal substrate such as copper, aluminum or nickel, and may be manufactured by stamping from a single metal substrate. The adapter 4 may be used to electrically connect the busbar 2 and the collection harness 3 to electrically connect the collection harness 3 with the busbar 2. For example, the first connecting piece 41 on the adapter 4 is welded to the pole 11 on the battery cell 1, and the second connecting piece 42 on the adapter 4 is welded to the wire in the collection harness 3.

In the embodiment of the present application, the first connection piece 41 may be provided at one end of the adapter 4 to electrically connect the adapter 4 with the bus bar 2 through the first connection piece 41. The structural shape of the first connecting piece 41 may be set according to the structural shape of the bus bar 2, such as providing the first connecting piece 41 as a square sheet-like structure.

In the embodiment of the present application, a second connection piece 42 may be provided at the other end of the adapter piece 4 to electrically connect the adapter piece 4 with the collection wire harness 3 through the second connection piece 42. The structural shape of the second connecting piece 42 may be set according to the structural shape of the collection wire harness 3. For example, in the case where the wires in the collection wire harness 3 are cylindrical wires, the second connection piece 42 may be provided in a sheet-like structure that is adapted to the cylindrical wires, such as a circular arc-shaped groove provided on the side of the second connection piece 42, to increase the contact area of the second connection piece 42 with the cylindrical wires.

In the embodiment of the present application, the first connection piece 41 and the second connection piece 42 may be connected by the flexible connection section 43 as an integral structure, and at least a part of the flexible connection section 43 is made of a flexible material. The flexible connection section 43 is made of a flexible material at least partially, so that the flexible connection section 43 can be deformed under the action of external force without generating cracks or even breaking. For example, the flexible connection section 43 may be formed to be thin with respect to the first connection piece 41 and the second connection piece 42, so that the flexible connection section 43 made of metal has better deformability and is easily deformed by external force.

In the embodiment of the application, referring to fig. 3, fig. 3 shows a schematic structural diagram of an adaptor provided by the application. As shown in fig. 1 and 3, the first connecting piece 41 and the second connecting piece 42 have a displacement difference F in the stacking direction D of the plurality of battery cells 1. The stacking direction D of the plurality of battery cells 1 refers to a direction in which the plurality of battery cells 1 are sequentially arranged. In the use process of the battery cell 1, a small expansion may be generated, and in the direction along which the plurality of battery cells 1 are sequentially arranged, the battery cell 1 may generate a displacement along the stacking direction D of the plurality of battery cells 1 due to the expansion, and the closer to the outside the battery cell 1, the larger the displacement amount may be. In the stacking direction D of the plurality of battery cells 1, the first connecting piece 41 and the second connecting piece 42 having the displacement difference F means: as shown in fig. 3, the second connecting piece 42 is offset to one side of the first connecting piece 41 with respect to the first connecting piece 41 in the stacking direction D, and the center line of the first connecting piece 41 and the center line of the second connecting piece 42 do not coincide. It can also be understood that the vertical distance between the first and second connection tabs 41 and 42 and the plane perpendicular to the stacking direction D of the plurality of battery cells 1 is not equal. For example, in the stacking direction D along the center line of the second connecting piece 42 toward the center line of the first connecting piece 41, the first connecting piece 41 and the second connecting piece 42 are offset by a certain distance, and the offset distance is a displacement difference F between the first connecting piece 41 and the second connecting piece 42 in the stacking direction D along the plurality of battery cells 1, and the size of the displacement difference F may be set according to the application scenario of the connecting assembly.

The above connection assembly, due to the inclusion of the bus bar 2, may electrically connect the poles 11 of the battery cells 1 through the bus bar 2 to connect the battery cells 1 in series or in parallel; the collection wiring harness 3 is arranged, and can be electrically connected with the battery management system through the collection wiring harness 3; and meanwhile, the busbar 2 is electrically connected with the acquisition wire harness 3 through the adapter 4, and the battery cell 1 can be electrically connected with the battery management system so as to realize sampling of the temperature, the voltage and the like of the battery cell 1. Because the adaptor 4 is provided, in the process of manufacturing the connection assembly, the collection wiring harness 3 does not need to be bent so that the collection wiring harness 3 and the bus bar 2 are directly connected, but the adaptor 4 is electrically connected with the corresponding position on the collection wiring harness 3, and the adaptor 4 is electrically connected with the bus bar 2. Like this, in the in-process of production, can all place collection pencil 3, adaptor 4 and busbar 2 at the equipment station that corresponds can, the condition that does not have the atress between the three to can not take place relative movement, then can electrically connect adaptor 4 and collection pencil 3 through automatic mode, electrically connect adaptor 4 and busbar 2, and then can improve this coupling assembling's production efficiency.

Meanwhile, the adaptor 4 in the connecting assembly is provided in a structure form comprising the first connecting sheet 41 and the second connecting sheet 42, and connection points can be respectively provided through the first connecting sheet 41 and the second connecting sheet 42 so as to electrically connect the adaptor 4 with the busbar 2 through the first connecting sheet 41 and electrically connect the adaptor 4 with the collection wiring harness 3 through the second connecting sheet 42; and the first connecting piece 41 and the second connecting piece 42 are connected through the flexible connecting section 43, so that the battery cell 1 and the acquisition wire harness 3 can be electrically connected; and the first connection piece 41 and the second connection piece 42 are provided in a structure having a displacement difference F in the stacking direction D of the plurality of battery cells 1. In the case of applying the connection assembly provided by the embodiment of the application to a battery, the collection wire harness 3 extends along the stacking direction D of the plurality of battery cells 1, in the process of moving the battery cells 1 relative to the collection wire harness 3, the displacement difference F of the first connection piece 41 and the second connection piece 42 along the stacking direction D of the plurality of battery cells 1 can offset the distance generated by the movement of the battery cells 1 relative to the collection wire harness 3, and the first connection piece 41 and the second connection piece 42 are connected through the flexible connection section 43, so that the adaptor 4 deforms under the condition that the first connection piece 41 and the second connection piece 42 generate relative movement, and the stress generated on the adaptor 4 is reduced, thereby reducing the risk that the adaptor 4 is pulled apart due to the external force applied to the adaptor 4, reducing the risk that the connection point of the adaptor 4 and the collection wire harness 3 is cracked and failed, and further improving the reliability of the connection assembly.

In some embodiments, a fuse may be provided on the flexible connection section 43. For example, a fusing part is provided on a portion of the flexible connection section 43 near the first connection piece 41 or near the second connection piece 42; in the case where the current flowing through the flexible connection section 43 is greater than a preset current, the fusing part fuses to disconnect the first connection piece 41 and the second connection piece 42.

In the embodiment of the present application, as shown in fig. 3, a fusing part may be provided at a portion of the flexible connection section 43 near the first connection piece 41. Alternatively, the fusing part may be provided on a portion of the flexible connection section 43 near the second connection piece 42. The fusing part can be set according to the current flowing through the adaptor 4, for example, the cross section of the fusing part can be set according to the maximum bearing current allowed to flow through the adaptor 4, so that under the condition that the current flowing through the adaptor 4 is greater than the maximum bearing current, the fusing part automatically fuses to disconnect the first connecting piece 41 from the second connecting piece 42, thereby disconnecting the connection between the battery cell 1 and the collection wire harness 3, and further avoiding larger influence of larger current on the battery cell 1 and the BMS. For example, the fusing part may be provided in a curved structure to increase the length of the fusing part.

In the above embodiment, since the fusing part is provided on the flexible connection section 43, the fusing part may automatically fuse when the current flowing through the adapter 4 exceeds the maximum current that can be borne by the fusing part, so that the connection between the first connection piece 41 and the second connection piece 42 may be disconnected, and thus the battery cell 1 and the collection wire harness 3 electrically connected through the adapter 4 may be disconnected, so as to reduce the risk of the battery cell 1 and other devices connected to the collection wire harness 3 due to current overload.

In some embodiments, the flexible connection section 43 may be configured to include a flexible section 431, a first extension section 432, and a second extension section 433, wherein the flexible section 431 is connected to the first connection piece 41 through the first extension section 432, and the flexible section 431 is connected to the second connection piece 42 through the second extension section 433; the fusing part is located on the first extension 432 or the second extension 433.

In the embodiment of the present application, the length of the flexible section 431 may be set according to the application scenario of the adaptor 4, and in the case that the first connecting piece 41 needs to generate a larger displacement relative to the second connecting piece 42, the length of the flexible section 431 may be set to be longer. The flexible segments 431 may be made of a flexible material to provide the flexible segments 431 with a good deformability, and the flexible segments 431 may be easily deformed to reduce stress on the adapter 4 when the adapter 4 is subjected to an external force. The flexible section 431 may be connected with the first connection piece 41 through a first extension section 432, and the first extension section 432 may be formed to extend in the direction of the center line of the first connection piece 41. The deformation section and the second connection piece 42 may be connected by a second extension section 433, and the second extension section 433 may be formed to extend in the direction of the center line of the second connection piece 42. The fusing part may be disposed on the first extension 432 or the second extension 433.

In the above embodiment, since the flexible connection section 43 includes the flexible section 431 and the flexible section 431 is made of a flexible material, the flexible section 431 can be rapidly deformed along the direction of the external force when the adaptor 4 is subjected to the external force, so as to reduce the stress generated on the adaptor 4, and thus the risk of the adaptor 4 being pulled apart can be reduced; meanwhile, the flexible section 431 is connected with the first connecting piece 41 through the first extending section 432, the flexible section 431 is connected with the second connecting piece 42 through the second extending section 433, and under the condition that the flexible section 431 is deformed, the first extending section 432 and the second extending section 433 are used for buffering, so that the influence on the first connecting piece 41 and the second connecting piece 42 can be reduced, and the risk of cracking of the connecting point of the first connecting piece 41 and the second connecting piece 42 can be reduced. Meanwhile, the fusing part is arranged on the first extending section 432 or the second extending section 433, and the deformation of the first extending section 432 and the second extending section 433 is small, so that the risk of cracking or even breaking of the fusing part under the action of external force can be reduced.

In some embodiments, the projection of the flexible segment 431 is curved in the plane of the second connecting tab 42.

In the embodiment of the present application, the first connecting piece 41, the flexible connecting section 43 and the second connecting piece 42 may all be located in the same plane, and the deformed section on the flexible connecting section 43 may be set to a curved structure. Or in the case where the first connecting piece 41 and the second connecting piece 42 are not in the same plane, the flexible section 431 is arranged such that its projection in the plane of the second connecting piece 42 is a curved structure.

In the above embodiment, since the flexible segments 431 are provided in a curved structure, the extension length of the flexible segments 431 can be increased, and thus the length of the flexible connection segments 43 can be increased. In this way, in the case where the flexible connection section 43 is deformed, the flexible connection section 43 can be deformed more without causing a tensile stress between the first connection piece 41 and the second connection piece 42.

In some embodiments, referring to fig. 4, fig. 4 shows a schematic structural view of an adapter and an acquisition harness in a connection assembly provided by the present application. In order to facilitate the electrical connection between the adaptor 4 and the collection wire harness 3, a filling connection hole 421 may be formed in the second connection piece 42, a notch 31 adapted to the second connection piece may be formed in the protective film of the collection wire harness 3, the second connection piece 42 may be disposed at a position corresponding to the notch 31, and the second connection piece 42 may be electrically connected to the wires in the collection wire harness 3 exposed through the notch 31 through the filling connection hole 421.

In the embodiment of the present application, a through hole may be provided on the second connecting piece 42, and the through hole may be used as the filling connection hole 421. The position of the filling connection hole 421 on the second connection piece 42 can be determined according to the connection position of the second connection piece 42 and the collection wire harness 3. For example, the setting position of the filling connection hole 421 may be determined according to the center distance between two adjacent wires in the collection harness 3.

In the embodiment of the present application, a notch 31 may be provided on the collection wire harness 3 at a position corresponding to each of the second connection pieces 42, the notch 31 being formed from a protective film on the outer side of the collection wire harness 3, and a portion of the wires in the collection wire harness 3 may be exposed through the notch 31 to electrically connect the second connection piece 42 with the wires at the corresponding position in the collection wire harness 3. For example, the filling connection hole 421 on the second connection piece 42 may be opposite to the notch 31 on the collection wire harness 3, the second connection piece 42 may be welded to the wire exposed through the notch 31 by means of welding, and the filling connection hole 421 may be filled with solder, so that the solder is connected to the wire and the hole wall of the filling connection hole 421, so as to increase the welding area between the second connection piece 42 and the wire.

In the embodiment of the present application, as shown in fig. 4, at least two filling connection holes 421 may be further provided on the second connection pieces 42 on some of the adapters 4; correspondingly, notches 31 corresponding to the at least two filling connection holes 421 are provided on the collection harness 3, respectively, to electrically connect one second connection piece 42 with at least two wires in the collection harness 3 at the same time. For example, two filling connection holes 421 may be provided on one second connection piece 42, the two filling connection holes 421 are distributed on the second connection piece 42 along the first direction C, and two notches 31 are provided on the collection wire harness 3, respectively, so that the one second connection piece 42 can be simultaneously electrically connected with two wires on the collection wire harness 3, and then two parameters of the battery cell 1 can be simultaneously measured through the adapter 4 including the one second connection piece 42, as well as the temperature and the voltage of the battery cell 1.

In the above embodiment, since the filling connection hole 421 is provided on the second connection piece 42, the notch 31 corresponding to the second connection piece 42 is formed on the collection wire harness 3, so that a part of the wires in the collection wire harness 3 can be exposed to the outside through the notch 31; in the case of electrically connecting the second connection piece 42 with the collection wire harness 3, the second connection piece 42 and the wire in the collection wire harness 3 may be positioned by filling the connection hole 421, and then the second connection piece 42 and the wire may be welded by filling the connection hole 421, so that the welding area between the second connection piece 42 and the wire may be increased by filling the connection hole 421 to improve the connection strength between the second connection piece 42 and the collection wire harness 3.

In some implementations, the width E of the second connection tab is smaller than the center distance of the two wires in a radial direction along the wires in the collection harness 3.

In the embodiment of the present application, as shown in fig. 3 and 4, since the collection wiring harness 3 has a plurality of wires (each wire extends in the stacking direction D in the drawing) arranged in parallel, adjacent wires are isolated by a protective film. In the case of electrically connecting the second connection piece 42 with a corresponding one of the wires in the collection harness 3, in order to avoid contact between the second connection piece 42 and an adjacent wire. The width E of the second connection piece in the radial direction of the wires may be set smaller than the center distance of the two wires, that is, the width E in the radial direction of the wires. For example, in the case where the center distance of two adjacent wires is 2mm, the width E of the second connecting piece may be set to 1.95mm, or may be another width smaller than 2 mm.

In the embodiment of the present application, as shown in fig. 4, in the radial direction (first direction C in the drawing) along the wires in the collection harness 3, the width of the notch 31 on the collection harness 3 may also be set to be equal to or smaller than the center distance of the two wires. For example, in the case where the center distance between two adjacent wires is 2mm, the width of the notch 31 may be set to 1.9mm or may be set to another width smaller than 2 mm.

In the above embodiment, since the width E of the second connecting piece is set smaller than the center distance of the two wires, the risk of contact between the second connecting piece 42 and the adjacent wires can be reduced.

In some embodiments, the width E of the second connection tab is less than or equal to seven tenths of the center distance of the two wires in the radial direction along the wires in the collection harness 3.

In the embodiment of the present application, the width E of the second connecting piece may be set to a suitable width according to the center distance between the two wires in the collection wire harness 3. For example, in the case where the center distance of two adjacent wires is 2mm, the width E of the second connecting piece may be set to 1.4mm, or a width narrower than 1.4 mm. This reduces the risk of the second connection pad 42 coming into contact with an adjacent wire and facilitates the electrical connection of the second connection pad 42 to the corresponding wire.

In the embodiment of the present application, the width of the notch 31 on the collection wire harness 3 may be set to be seven tenths or less of the center distance of the two wires in the radial direction along the wires in the collection wire harness 3. For example, in the case where the center distance of two adjacent wires is 2mm, the width of the notch 31 may be set to 1.4mm, or other widths smaller than 1.4 mm.

In some embodiments, the width E of the second connection piece is equal to the distance of the gap between the two wires in the radial direction along the wires in the collection harness 3.

In the embodiment of the present application, the width E of the second connecting piece may be set according to the distance of the gap between the two wires in the collection wire harness 3. For example, in the case where the center distance of two adjacent wires is 2mm and the width of each wire is 0.7mm, the distance of the gap between the two adjacent wires is 1.3mm, so that the width E of the second connecting piece can be set to 1.3mm. In this way, in the case of electrically coupling the second connection piece 42 with the corresponding wire in the collection harness 3, a longer distance can be provided between the second connection piece 42 and both wires adjacent to the wire.

In the embodiment of the present application, the width of the notch 31 on the collection wire harness 3 may also be set to be equal to the distance of the gap between the two wires in the radial direction along the wires in the collection wire harness 3. For example, in the case where the center distance of two adjacent wires is 2mm, the width of the notch 31 may be set to 1.3mm.

In some embodiments, the second connection piece 42 is provided with a protective layer, which is an insulating material, at a position corresponding to the notch on the collection harness 3.

In the embodiment of the present application, after the second connection piece 42 is electrically connected to the wires in the collection wire harness 3, since the wires in the collection wire harness 3 are exposed through the notch 31, there may be a part of the wires exposed to the outside, and a part of the second connection piece 42 is also directly exposed to the outside. This tends to cause the second connecting piece 42 to come into contact with other surrounding devices, which may cause leakage. A protective layer may be provided on the second connection piece 42 and extend to the position of the notch 31 on the collection wire harness 3 to seal the second connection piece 42 and the notch 31. The protective layer may be made of an insulating material, for example, an insulating material such as PET, PI, or PEN.

In the above embodiment, since the second connection piece 42 and the notch 31 on the collection wire harness 3 are provided with the insulating protection layer, on one hand, the second connection piece 42 can be insulated, and the notch 31 on the collection wire harness 3 can be sealed, so that the exposed wires in the collection wire harness 3 can be insulated; on the other hand, the connection of the second connection piece 42 to the collection wire harness 3 can be reinforced by a protective layer, so that the risk of failure due to connection cracking of the second connection piece 42 to the wires in the collection wire harness 3 is reduced.

In some embodiments, as shown in fig. 3, an insulating layer 44 may be disposed on the flexible connection section 43, the insulating layer 44 being wrapped over the flexible connection section 43, and the insulating layer 44 being a flexible material.

In the embodiment of the present application, the insulating layer 44 may be made of insulating plastic, for example, the insulating layer 44 may be made of insulating material such as polyethylene terephthalate (Polyethylene Glycol Terephthalate, PET), polyimide (Polyimide, PI) or polyethylene naphthalate (Polyethylene Naphthalate Two Formic Acid Glycol Ester, PEN). The insulating material may be formed in a film-like structure, and the insulating material in a film-like form is applied to opposite sides of the flexible connection section 43, respectively, and the portions of the two insulating films beyond the flexible connection section 43 are left for a certain width, and the remaining portions are bonded to each other to form the insulating layer 44. The insulating layer 44 is provided in a film shape, and the insulating layer 44 formed by using insulating plastic has good flexibility.

In the above embodiment, since the insulating layer 44 is provided on the flexible connection section 43, the risk of occurrence of short-circuiting between the flexible connection section 43 and other adjacent devices in the adapter 4 can be reduced. Meanwhile, the insulating layer 44 is made of a flexible material, on one hand, the strength and toughness of the flexible connecting section 43 can be enhanced through the flexible insulating layer 44, so that the risk of breakage of the flexible connecting section 43 under the condition of pulling force is reduced, and meanwhile, the risk of breakage of the flexible connecting section 43 under the condition of vibration of the adapter 4 is reduced; on the other hand, the flexible connection section 43 is also easier to deform without creating stress on the flexible connection section 43.

In some embodiments, the insulating layer 44 extends from the flexible connection section 43 to the first connection tab 41 and the second connection tab 42, respectively, and covers a portion of the first connection tab 41 proximate to the flexible connection section 43 and also covers a portion of the second connection tab 42 proximate to the flexible connection section 43.

In the embodiment of the present application, the insulation layer 44 may be set longer than the length of the flexible connection section 43 along the extending direction of the adaptor 4, that is, a portion of the first connection piece 41 adjacent to the flexible connection section 43 is also covered by the insulation layer 44, and a portion of the second connection piece 42 adjacent to the flexible connection section 43 is also covered by the insulation layer 44. However, it is not necessary to cover the entirety of the first connecting piece 41 and the second connecting piece 42 with the insulating layer 44, so as to avoid the influence on the electrical connection between the first connecting piece 41 and the battery cell 1, and the influence on the electrical connection between the second connecting piece 42 and the collection harness 3.

In the above embodiment, since the insulating layer 44 is extended onto the first connecting piece 41 and the second connecting piece 42, the connection between the first connecting piece 41 and the flexible connecting section 43 can be reinforced and stabilized by the insulating layer 44, and the connection between the second connecting piece 42 and the flexible connecting section 43 can be reinforced and stabilized by the insulating layer 44, so that the connection between the flexible connecting section 43, which is thinner than the two connecting pieces, and the two connecting pieces can be more firmly connected, and the risk of breakage caused by pulling the flexible connecting section 43 under the condition of deformation is reduced; and the shape of the flexible connection section 43 can be better shaped by the insulating layer 44.

Meanwhile, the embodiment of the application also provides a battery, as shown in fig. 1, 2 and 3, which comprises: the battery cell 1 and the connecting assembly provided in any one of the above embodiments; wherein the battery cell 1 has a pole 11; the busbar 2 in the connection assembly is electrically connected with the pole 11.

In the embodiment of the application, the battery may be a battery module, and when there are a plurality of battery cells 1, a plurality of battery cells 1 are stacked and fixed to form a battery module. The battery may also be a battery pack, which includes a case and a battery cell 1, and the battery cell 1 or the battery module is accommodated in the case.

The battery cell 1 may be a secondary battery, and the secondary battery refers to the battery cell 1 that can be continuously used by activating an active material by charging after the battery cell 1 is discharged. The battery cell 1 may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like, which is not limited by the embodiment of the present application. As an example, the battery cell 1 may be a cylindrical battery cell 1, a prismatic battery cell 1, a pouch battery cell 1, or other shaped battery cells 1, and the prismatic battery cell 1 includes a square-case battery cell 1, a blade-shaped battery cell 1, a polygonal-prismatic battery, such as a hexagonal-prismatic battery, etc., and the present application is not particularly limited. The battery cell 1 is provided with a pole 11, and the battery cell 1 and the external conductor can be electrically connected through the pole 11, or adjacent battery cells 1 can be connected through the pole 11.

In the embodiment of the application, the busbar 2 in the connecting assembly is electrically connected with the pole 11 on the battery monomer 1, and the second connecting sheet 42 is electrically connected with one wire in the acquisition wire harness 3, so that the battery monomer 1 is electrically connected with the acquisition wire harness 3, the acquisition wire harness 3 can be electrically connected with the BMS, the battery monomer 1 is electrically connected with the BMS, and parameters such as temperature, voltage and the like of the battery monomer 1 can be acquired.

In the above embodiment, the arrangement position of the collection wire harness 3 may be determined according to the stacking manner of the battery cells 1, and the battery cells 1 may be connected in series or in parallel by electrically connecting the bus bars 2 in the connection assembly with the poles 11 on the battery cells 1. Compared with the mode of directly electrically connecting the collection wire harness 3 with the battery cell 1 in the related art, in the embodiment of the application, the connection position of the adapter 4 and the collection wire harness 3 can be determined according to the stacking mode of the battery cell 1 and the connection position of the adapter 4 and the bus bar 2, so that the connection point of each collection wire harness 3 and the adapter 4 can be processed, each adapter 4 can be electrically connected with the collection wire harness 3 first, and then the collection wire harness 3 connected with the adapter 4 is placed at the position corresponding to the battery cell 1 to electrically connect the bus bar 2 and the first connecting piece 41. Like this, because the hookup location of every adaptor 4 and collection pencil 3 is fixed, can be to adaptor 4 and collection pencil 3, all accomplish through automation equipment to the connection of adaptor 4 and busbar 2, accomplish the connection through automation equipment again with the busbar 2 that is connected with adaptor 4 and the utmost point post 11 on the battery monomer 1 to can improve production efficiency.

In some embodiments, referring to fig. 5, fig. 5 is an enlarged view of part B of fig. 1 provided by the present application. In the stacking direction D of the plurality of battery cells 1, the first connection piece 41 is closer to the center of the battery cell 1 than the second connection piece 42, the displacement difference F of the first connection piece 41 and the second connection piece 42 is positively correlated with the displacement distance of the pole 11, and the displacement distance of the pole 11 is the movement distance of the pole 11 relative to the second connection piece 42 when the battery cell 1 expands.

In the embodiment of the present application, as shown in fig. 5, the first connecting piece 41 and the second connecting piece 42 are offset by a certain distance in the stacking direction D of the plurality of battery cells 1, and the first connecting piece 41 on the adapter 4 connected to the battery cell 1 is disposed at a position closer to the center of the battery cell 1, so that the second connecting piece 42 on the adapter 4 connected to the collection harness 3 is located at a position farther from the center of the battery cell 1, that is, the second connecting piece 42 is closer to the edge of the battery cell 1 than the first connecting piece 41.

In the embodiment of the present application, the displacement difference F between the first connecting piece 41 and the second connecting piece 42 of the adaptor 4 is positively correlated with the displacement distance of the pole 11. During the use of the battery cell 1, a small expansion will be generated, and during the expansion of the battery cell 1, the pole 11 will move relative to the collection wire harness 3, and the first connection piece 41 connected with the pole 11 will also be driven to move relative to the second connection piece 42. The larger the expansion amount of the battery cell 1, the larger the distance of the relative movement of the first connecting piece 41 and the second connecting piece 42, and the displacement difference F of the first connecting piece 41 and the second connecting piece 42 of the adapter 4 electrically connected to the battery cell 1 can be determined according to the expansion amount of each battery cell 1. In the case where the expansion amount of the battery cell 1 is larger, the displacement difference F between the first connecting piece 41 and the second connecting piece 42 needs to be set larger; in the case where the expansion amount of the battery cell 1 is small, the displacement difference F of the first connecting piece 41 and the second connecting piece 42 is set small.

In the above embodiment, since the first connecting piece 41 of the adapter 4 is disposed at a position closer to the center of the battery cell 1 than the second connecting piece 42, the first connecting piece 41 can move relative to the second connecting piece 42 when the battery cell 1 expands, and since the flexible connecting section 43 on the adapter 4 can deform, the deformation of the adapter 4 caused by the expansion of the battery cell 1 can be counteracted by the displacement difference F between the first connecting piece 41 and the second connecting piece 42, so that the risk that the adapter 4 is pulled due to the expansion of the battery cell 1 can be reduced. Meanwhile, the displacement difference F between the first connecting piece 41 and the second connecting piece 42 is determined according to the expansion amount of the battery cell 1, and the displacement difference F between the first connecting piece 41 and the second connecting piece 42 is positively correlated with the expansion amount of the battery cell 1, so that the risk that the adaptor 4 is pulled due to the fact that the movement distance of the first connecting piece 41 relative to the second connecting piece 42 caused by the expansion of the battery cell 1 is larger than the displacement difference F can be reduced.

In some embodiments, the battery comprises at least two battery cells 1; the first connecting piece 41 in each adapter piece 4 is closer to the center of at least two battery cells than the second connecting piece 42 in the stacking direction D of at least two battery cells 1.

In the embodiment of the present application, as shown in fig. 5, at least two battery cells 1 may be disposed in a battery, and at least two battery cells 1 may be sequentially arranged and fixedly disposed. For example, there are two battery cells 1 in the battery, and then the center of the two battery cells 1 is the middle position of the two battery cells 1; in the case of three battery cells 1 in the battery, the centers of the three battery cells 1 are the positions where the centers of the battery cells 1 located at the intermediate positions are located. In the process of providing the adapters 4 connecting each of the battery cells 1 and the collection wire harness 3, the first connecting piece 41 in each of the adapters 4 may be located closer to the center of at least two battery cells, and the second connecting piece 42 in each of the adapters 4 may be located farther from the center of at least two battery cells.

In the above embodiment, in the case where at least two battery cells 1 are provided in the battery, the first connecting piece 41 in each adapter 4 is provided at a position closer to the center of at least two battery cells than the second connecting piece 42, and in the case where expansion occurs in the battery cells 1 in the stacking direction D of the battery cells 1, the direction of misalignment of the first connecting piece 41 of each adapter 4 with respect to the second connecting piece 42 can be made opposite to the direction of movement of each pole 11, so that the first connecting piece 41 can be made to move in the direction opposite to the direction of misalignment with respect to the second connecting piece 42.

In some embodiments, the displacement difference F between the first connecting piece 41 and the second connecting piece 42 in the stacking direction D of at least two battery cells 1 is equal to or greater than a first distance that is half of the movement distance of the pole 11 on each battery cell 1 relative to the center of at least two battery cells in the case where each battery cell 1 expands.

In the embodiment of the present application, the displacement difference F of the first connecting piece 41 and the second connecting piece 42 may be set to a distance equal to the first distance, or the displacement difference F may be set to a distance greater than the first distance. For example, in the case where the battery cells 1 are expanded, in the stacking direction D of at least two battery cells 1, the resulting movement distance of the tab 11 relative to the centers of at least two battery cells is 10mm, the displacement difference F of the first connection piece 41 and the second connection piece 42 may be set to 5mm, or the displacement difference F may be set to a distance of 6mm, 7mm, or the like, which is greater than 5 mm.

In the above embodiment, since the displacement difference F between the first connecting piece 41 and the second connecting piece 42 is set to be equal to or greater than the first distance, the first connecting piece 41 can be moved from one side of the second connecting piece 42 to the other side of the second connecting piece 42 in the case where the battery cell 1 expands, so as to maximally accommodate the influence of the expansion of the battery cell 1 on the adapter 4.

The embodiment of the application also provides an electric device comprising the battery for providing electric energy, wherein the electric device can be, but is not limited to, a mobile phone, a tablet personal computer, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like. The electric device comprises the connecting component provided by the embodiment, so that the reliability of connection between the battery cell 1 and the acquisition wire harness 3 can be improved.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (16)

1. A connection assembly, comprising:

a bus bar for electrically connecting a plurality of stacked battery cells;

An adapter having a first connecting tab, a second connecting tab, and a flexible connecting section, the first connecting tab being electrically connected to the busbar; the flexible connecting section is connected with the first connecting sheet and the second connecting sheet;

The collecting wire harness is connected with the second connecting sheet;

Wherein the first connecting piece and the second connecting piece have a displacement difference in a stacking direction along a plurality of the battery cells.

2. The connection assembly of claim 1, wherein the flexible connection section has a fuse portion on a portion thereof adjacent to the first connection tab or adjacent to the second connection tab; and under the condition that the current flowing through the flexible connecting section is larger than the preset current, the fusing part fuses to disconnect the first connecting sheet and the second connecting sheet.

3. The connection assembly of claim 2, wherein the flexible connection section comprises a flexible section, a first extension section, and a second extension section, the flexible section being connected to the first connection tab by the first extension section, the flexible section being connected to the second connection tab by the second extension section; the fusing part is positioned on the first extension section or the second extension section.

4. A connection assembly according to claim 3, wherein the projection of the flexible segment is curved in the plane of the second connecting tab.

5. The connection assembly according to any one of claims 1 to 4, wherein a filling connection hole is provided in the second connection piece, a notch adapted to the second connection piece is provided in a protective film of the collection wire harness, the second connection piece is provided at a position corresponding to the notch, and the second connection piece is electrically connected with a wire in the collection wire harness exposed through the notch through the filling connection hole.

6. The connection assembly according to claim 5, wherein the width of the second connecting piece in a radial direction along the wires is smaller than a center distance of two wires.

7. The connection assembly according to claim 5, wherein the width of the second connecting piece in the radial direction of the wires is equal to or less than seven tenths of the center distance of two wires.

8. The connection assembly according to claim 5, wherein the width of the second connection piece in a radial direction along the wires is equal to a distance of a gap between two wires.

9. The connection assembly of claim 5, wherein the second connection piece and the notch on the collection wire harness are each provided with a protective layer, and the protective layers are made of insulating materials.

10. The connection assembly according to any one of claims 1 to 4, wherein the flexible connection section is coated with an insulating layer, the insulating layer being a flexible material.

11. The connection assembly of claim 10, wherein the insulating layer extends from the flexible connection section to the first connection tab and the second connection tab, respectively, and encases a portion of the first connection tab proximate the flexible connection section and encases a portion of the second connection tab proximate the flexible connection section.

12. A battery, comprising:

A battery cell having a post;

The connection assembly of any one of claims 1 to 11, the buss bar being electrically connected to the post.

13. The battery according to claim 12, wherein the first connecting piece is closer to the center of the battery cell than the second connecting piece in a stacking direction of the plurality of battery cells, a displacement difference between the first connecting piece and the second connecting piece is positively correlated with a displacement distance of the post, the displacement distance of the post being a displacement distance of the post relative to the second connecting piece in a case where the battery cell expands.

14. The battery of claim 13, comprising at least two battery cells; the first connecting piece in each of the adapters is closer to the center of at least two of the battery cells than the second connecting piece in the stacking direction of at least two of the battery cells.

15. The battery according to claim 14, wherein a displacement difference between the first connecting piece and the second connecting piece in a stacking direction of at least two of the battery cells is equal to or greater than a first distance that is half a displacement distance generated by the post on each of the battery cells with respect to a center of at least two of the battery cells in a case where each of the battery cells is expanded.

16. An electrical device comprising a battery as claimed in any one of claims 12 to 15 for providing electrical energy.