CN210668516U

CN210668516U - Connection structure, battery module, battery system and electric vehicle

Info

Publication number: CN210668516U
Application number: CN201921625827.6U
Authority: CN
Inventors: 兰天保; 李长江; 阮晓行
Original assignee: Dongguan Amperex Technology Ltd
Current assignee: Dongguan Amperex Technology Ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-06-02
Anticipated expiration: 2029-09-26

Abstract

A connection structure for a battery module, the connection structure comprising: at least one fixing component arranged on the side of the battery module; and the first connecting piece is arranged on the fixed component and is electrically connected with the battery module. The application also provides a battery module, a battery system and an electric vehicle comprising the connection structure. The application provides a connection structure, through inciting somebody to action fixed subassembly is fixed to be set up on battery module's shell, first connecting piece fixed set up in on the fixed subassembly, when utmost point ear set up in when first connecting piece is last, can prevent effectively that battery module from receiving external force influence, utmost point ear is dragged.

Description

Connection structure, battery module, battery system and electric vehicle

Technical Field

The application relates to the field of mechanical connection assemblies, in particular to a connection structure, a battery module, a battery system and an electric vehicle.

Background

The connection structure of the lithium ion battery module is used for connecting the battery module and is the key for forming a battery system.

There are two types of connection structures commonly used in lithium ion batteries. The first one is that adopt the copper bar to be connected with the power cable after with utmost point ear welding, when needs pass through the heavy current, need provide thick power cable, lead the radius of buckling of actuating power cable too big, on the utmost point ear can be transmitted to the stress of buckling of power cable. The second is to connect the copper bar and the tab by a connecting piece after welding, but the copper bar has no fixed limit, and the bolt torque of the bolted copper bar can be transmitted to the tab. The two connection structures are easy to cause the tab to tear, so that the connection structure fails.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a connection structure with reliable connection.

In addition, it is also necessary to provide a battery module, a battery system and an electric vehicle including the connection structure.

A connection structure for a battery module, the connection structure comprising:

at least one fixing component arranged on the side of the battery module; and

at least one first connecting piece, first connecting piece set up in on the fixed subassembly, first connecting piece with the battery module electricity is connected.

Further, the fixing component comprises a fixing part, a fixing groove is formed in the fixing part, and the fixing groove is used for being fixed with the side edge of the battery module.

Furthermore, a buckle is arranged on the side wall of the fixing groove, a clamping hole is formed in the side edge of the battery module, and the buckle is buckled in the clamping hole; or the side wall of the fixing groove is provided with the clamping hole, the side edge of the battery module is provided with the buckle, and the buckle is buckled in the clamping hole.

Furthermore, the fixing component comprises a connecting part connected with the fixing part, the connecting part is provided with a first accommodating groove, and part or all of the first connecting part is accommodated in the first accommodating groove.

Furthermore, the connecting structure further comprises a fixing piece, and the fixing piece is used for fixing the fixing assembly and the first connecting piece.

Further, the fixing piece comprises a bolt and a nut, and the bolt comprises a head; the first connecting piece is provided with a through hole, and the fixing assembly comprises a second accommodating groove arranged on the bottom wall of the first accommodating groove; the bolt penetrates through the through hole and the first accommodating groove, and the second accommodating groove accommodates the head or the nut, so that the fixing assembly and the first connecting piece are fixed.

Furthermore, a second positioning part is arranged on the side wall of the first accommodating groove and is clamped with the first connecting piece accommodated in the first accommodating groove.

Further, the connection structure further comprises a fastener, and the fixing assembly is connected with the battery module through the fastener.

Furthermore, the connecting structure further comprises a second connecting piece, the second connecting piece is connected with two adjacent first connecting pieces, the second connecting piece comprises a through hole configured with the first connecting piece, and is configured with the nut and the bolt to fix the second connecting piece, the first connecting piece and the fixing component.

A battery module, comprising:

a housing;

a tab; and

the connecting structure, fixed subassembly fixed set up in on the shell, utmost point ear connect in on the first connecting piece.

A battery system, the battery system comprising:

the connecting structures on the two battery modules are arranged adjacently; and

and the second connecting pieces are respectively and electrically connected to the first connecting pieces on the two battery modules.

Furthermore, the second connecting piece is provided with a bending area which comprises a first connecting area, a second connecting area and is connected with the first connecting area and the second connecting area, and the bending area protrudes between the first connecting area and the second connecting area.

A battery system, the battery system comprising:

the battery modules comprise a shell, lugs and the connecting structures, the connecting structures on the two battery modules are adjacently arranged, fixed assemblies are fixedly arranged on the shell, and the lugs are connected to the first connecting piece;

the second connecting piece is respectively connected to the first connecting pieces on the two battery modules and comprises through holes configured with the first connecting pieces;

the nut is arranged outside the second connecting piece and is configured with the bolt to fix the second connecting piece, the first connecting piece and the fixing component.

An electric vehicle includes the battery module.

An electric vehicle includes the battery system.

The application provides a connection structure, through inciting somebody to action fixed subassembly is fixed to be set up on battery module's shell, first connecting piece fixed set up in on the fixed subassembly, when utmost point ear set up in when first connecting piece is last, can prevent effectively that battery module from receiving external force influence, utmost point ear is dragged.

Drawings

Fig. 1 is a schematic structural diagram of a connection structure provided in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a battery system according to an embodiment of the present application.

Fig. 3 is an exploded view of the connection structure shown in fig. 1.

Fig. 4 is a partially exploded view of the connection structure of fig. 1 disposed on a housing.

Fig. 5 is a schematic structural view of the connection structure shown in fig. 1.

Fig. 6 is a partial schematic view of another embodiment of a connecting structure disposed on a housing.

Fig. 7 is a top view of the screw shown in fig. 1 disposed in a fixing assembly.

FIG. 8 is a partial schematic view of another embodiment of a nut disposed on a retaining assembly.

Fig. 9 is a schematic structural diagram of a battery module according to an embodiment of the present application.

Fig. 10 is a partial structural view of the battery system shown in fig. 2.

Fig. 11 is a schematic structural diagram of an electric vehicle according to an embodiment of the present application.

Description of the main elements

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application, and the described embodiments are merely a subset of the embodiments of the present application, rather than all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection 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 in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes all and any combination of one or more of the associated listed items.

In various embodiments of the present application, for convenience in description and not limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, either direct or indirect. "up", "down", "left", "right", "X-axis", "Y-axis", "Z-axis", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1 and fig. 2, an embodiment of the present application provides a connection structure 100, wherein the connection structure 100 is used for connecting a battery module 200. The connection structure 100 includes a fixing member 10 and a first connecting member 30, the fixing member 10 is detachably disposed at a side 240 of the battery module 200, the first connecting member 30 is disposed on the fixing member 10, and the first connecting member 30 is electrically connected to the battery module 200.

The battery module 200 includes a housing 210, the housing 210 having the side 240, and the fixing member 10 detachably fixed to the side 240.

Referring to fig. 3, the fixing assembly 10 includes a fixing portion 12 and a connecting portion 14, wherein the fixing portion 12 is used for fixing the connecting structure 100 to the side 240; the connecting portion 14 is used for fixing the first connecting member 30. The fixing member 10 is made of an insulator, such as plastic.

Referring to fig. 4 and 5, the housing 210 includes a first surface 2102 and a second surface 2104, the first surface 2102 and the second surface 2104 are disposed opposite to each other, wherein the first surface 2102 is an inner surface of the housing 210, and the second surface 2104 is an outer surface of the housing 210. The fixing portion 12 includes a first bracket 122 and a second bracket 124 disposed substantially in parallel, wherein the first bracket 122 is connected to one end of the second bracket 124 to form a fixing groove 126. The housing 210 is partially received in the retaining groove 126, wherein the first support 122 abuts the first surface 2102 and the second support 124 abuts the second surface 2104. A catch 1242 is provided on the second bracket 124, and the catch 1242 is formed to protrude from the inner surface of the second bracket 124 toward the housing 210. The housing 210 is provided with a locking hole 2106 adapted to the locking buckle 1242, and the locking buckle 1242 is locked in the locking hole 2106. The area of the second bracket 124 opposite to the buckle 1242 of the first bracket 122 has a notch, that is, the buckle 1242 is exposed from the second bracket 124, so that the buckle 1242 is easy to detach after being buckled in the buckle hole 2106. Buckle 1242 is connected reliably with card hole 2106 structure, and the installation is simple, and convenient operation is convenient for connection structure 100 dismantles, practices thrift the later maintenance cost.

In this embodiment, the number of the buckles 1242 and the number of the fastening holes 2106 are two, and in other embodiments, the number of the buckles 1242 and the number of the fastening holes 2106 may be adaptively adjusted according to requirements, such as three or four.

In other embodiments, the positions of the buckle 1242 and the buckle hole 2106 are interchanged, that is, the buckle 1242 is disposed on the housing 210, the buckle hole 2106 is disposed on the second bracket 124, and the buckle 1242 is buckled in the buckle hole 2106.

Referring to fig. 6, in other embodiments, the fixing portion 12 includes the first bracket 122 and the second bracket 124, the second bracket 124 and the housing 210 are respectively provided with a first opening 1244, the first opening 1244 receives a fastening member 128, and the fixing portion 12 and the housing 210 are fixed by the fastening member 128. It is understood that the first bracket 122 may be omitted.

In other embodiments, the fixing portion 12 is fixed to the housing 210 by welding or bonding.

The fixing assembly 10 and the first connecting member 30 are connected in various ways, such as bonding, clamping, screwing, and the like, and in this embodiment, the fixing assembly 10 and the first connecting member 30 are connected by a fixing member 20.

The connecting portion 14 is connected to the fixing portion 12. In this embodiment, the connecting portion 14 and the fixing portion 12 are a single body. The connecting portion 14 is connected to the first connecting member 30 in an insulating manner, in this embodiment, the material of the connecting portion 14 is an insulator, such as plastic. In other embodiments, the material of the connecting portion 14 may also be an alloy material, and the alloy material is insulated from the surface contacting with the first connecting member 30.

Referring to fig. 5 again, the connecting portion 14 is provided with a first receiving groove 142. The first connecting member 30 is partially or entirely received in the first receiving groove 142.

In this embodiment, the first connecting member 30 is a copper bar. In other embodiments, the first connecting element 30 may be made of other conductive materials.

In the present embodiment, the first receiving groove 142 is formed by being recessed from a surface of the connecting portion 14 away from the fixing portion 12 toward the fixing portion 12. The first receiving groove 142 includes a bottom wall 1421, a first sidewall 1422, a second sidewall 1423, and a third sidewall 1424. The first side wall 1422, the second side wall 1423, and the third side wall 1424 are disposed around the bottom wall 1421, the first side wall 1422, the second side wall 1423, and the third side wall 1424 are disposed adjacent to each other in sequence, and the first side wall 1422 and the third side wall 1424 are disposed at a distance from each other to form the first receiving groove 142. The first receiving groove 142 has a second opening 1425, and the second opening 1425 is disposed between the first sidewall 1422 and the third sidewall 1424. The first connecting element 30 is partially received in the first receiving slot 142 and protrudes out of the first receiving slot 142 from the second opening 1425.

For convenience of description, a direction perpendicular to the bottom wall 1421 is defined as a "Z-axis", a direction perpendicular to the Z-axis and perpendicular to the second side wall 1423 is defined as an "X-axis", and a direction perpendicular to the Z-axis and the X-axis is defined as a "Y-axis".

Further, the first sidewall 1422 and the third sidewall 1424 are respectively provided with a first positioning portion 1426. The first positioning portion 1426 is received in the first receiving groove 142 and is protruded on the first side wall 1422 and the third side wall 1424 along the Y-axis direction for positioning the first connecting element 30. The side 240 of the first connecting member 30 is provided with a notch 324 adapted to the first positioning portion 1426, and the first positioning portion 1426 is engaged with the notch 324, so as to limit the movement of the first connecting member 30 along the X-axis and the Y-axis directions.

The second sidewall 1423 is provided with a second positioning portion 1427. The second positioning portion 1427 protrudes from the surface of the second sidewall 1423 along the Z-axis direction and then extends along the X-axis direction toward the first receiving groove 142 to position the first connecting element 30. When the first connecting element 30 is received in the first receiving slot 142, the second positioning portion 1427 limits the first connecting element 30 to move along the Z-axis direction.

Referring to fig. 3 again, the connecting portion 14 is further provided with a second receiving groove 144. The second receiving groove 144 is opened on the bottom wall 1421 of the first receiving groove 142, that is, the second receiving groove 144 is formed by recessing along the Z-axis direction, and the second receiving groove 144 is used for receiving the fixing element 20. In this embodiment, the fixing member 20 includes a screw 22 and a nut 24, and the screw 22 and the nut 24 are screwed to fix the fixing assembly 10 and the first connecting member 30.

Specifically, the screw 22 includes a head 222 and a shaft 224, the head 222 is connected to the shaft 224, the shaft 224 has a first thread 2242, the nut 24 includes a second thread 242 matching with the first thread 2242, and the screw 22 is screwed with the nut 24. The size of the second receiving groove 144 is matched with the size of the head 222, the second receiving groove 144 is used for receiving the head 222, the rod 224 is arranged upwards along the Z-axis direction, and the nut 24 is sleeved on the rod 224. The first connecting member 30 includes a first through hole 322 adapted to the rod portion 224, and the first through hole 322 is disposed in a region corresponding to the second receiving groove 144. When the head 222 of the bolt is received in the second receiving groove 144, the rod 224 extends upward along the Z-axis direction, the first connecting member 30 is sleeved on the rod 224 through the first through hole 322, the nut 24 is disposed on one side of the first connecting member 30, and the head 222 and the rod 224 are respectively located on two opposite sides of the first connecting member 30. Through the setting of bolt and nut 24, connect reliably, and be convenient for first connecting piece 30 with fixed subassembly 10 separation, the installation is simple, and convenient operation practices thrift the later maintenance cost.

In this embodiment, the number of the first through holes 322 and the number of the second receiving grooves 144 are two, and in other embodiments, the number of the first through holes 322 and the number of the second receiving grooves 144 may be adaptively adjusted according to needs, such as one, three, four, and the like.

Referring to fig. 5 and 7, the second receiving groove 144 further includes a fourth sidewall 146. In this embodiment, the second receiving groove 144 is a hexagonal prism, the second receiving groove 144 includes six fourth sidewalls 146, each of the fourth sidewalls 146 is provided with a protrusion 1462, and the head 222 is fixed to the protrusion 1462 in an interference manner. In other embodiments, the number of the protrusions 1462 can be adjusted according to actual needs, for example, two, three, etc., and the protrusions 1462 are used for further positioning the head 222.

In another embodiment, the protrusion 1462 may also be disposed on the head 222.

Referring to fig. 8, in another embodiment, the size of the second receiving groove 144 is matched with the size of the nut 24, and the nut 24 is preset in the second receiving groove 144. When the first connecting member 30 is received in the first receiving groove, the rod portion 224 of the bolt passes through the first through hole 322 and passes through the first through hole 322 downward along the Z-axis direction to reach the nut 24, so that the nut 24 is sleeved on the rod portion 224.

Referring to fig. 9, the present application further provides a battery module 200, where the battery module 200 includes a housing 210, a battery cell 220, a tab 230, and the connection structure 100, the battery cell 220 is disposed in the housing 210, the tab 230 extends out of the battery cell 220 and is electrically connected to the tab 230, the connection structure 100 is disposed on the housing 210, and the connection structure 100 is electrically connected to the tab 230.

Specifically, the connection structure 100 is disposed on the housing 210 through the fixing component 10, the fixing component 10 is connected to the housing 210 in an insulating manner, and the fixing component 10 is disposed on the housing 210 through the fixing portion 12. First connecting piece 30 is including setting up the through-hole region 32 of first through-hole 322 and except the joining region 34 of through-hole region 32, utmost point ear 230 is connected joining region 34, first connecting piece 30 is the copper bar, utmost point ear 230 pass through joining region 34 of copper bar with connection structure 100 is electric to be connected.

Further, referring to fig. 1 and fig. 3, the connection structure further includes a second connection member 40, the second connection member 40 includes a first connection region 42, a second connection region 44, and a bending region 46 connecting the first connection region 42 and the second connection region 44, and the first connection region 42 and the second connection region 44 are respectively fixed to the tabs 230 of two adjacent battery modules 200.

Referring to fig. 2 and 10, the present application further provides a battery system 300, where the battery system 300 at least includes two battery modules 200 and a second connecting member 40, and two adjacent battery modules 200 are electrically connected through the second connecting member 40, in this embodiment, the second connecting member 40 is a copper bar, and in other embodiments, the second connecting member 40 is made of other conductive materials.

Specifically, referring to fig. 1 and 3, the second connecting member 40 includes a first connecting region 42, a second connecting region 44, and a bending region 46 connecting the first connecting region 42 and the second connecting region 44, wherein the first connecting region 42 and the second connecting region 44 are respectively fixed to the tabs 230 of two adjacent battery modules 200.

Further, the bending region 46 has a protruding structure compared to the first connection region 42 and the second connection region 44, the protruding structure is substantially "U" shaped, and the protruding structure plays a role of buffering, that is, the battery module 200 prevents the tab 230 from being torn when being stretched or squeezed by an external force.

In an embodiment, the second connecting element 40 is fixed to the fixing assembly 10 and the first connecting element 30 by the fixing element 20, the fixing element 20 includes the screw 22 and the nut 24, the first connecting area 42 and the second connecting area 44 of the second connecting element 40 are respectively provided with a second through hole 48 matched with the rod portion 224, and the second through hole 48 is provided in an area corresponding to the second receiving groove 144. When the head 222 of the bolt is received in the second receiving groove 144, the rod 224 extends upward along the Z-axis direction, the first connecting member 30 and the second connecting member 40 are respectively sleeved on the rod 224 through the first through hole 322 and the second through hole 48, the nut 24 is disposed on the second connecting member 40 and on a side away from the first connecting member 30, and the nut 24 abuts against the second connecting member 40.

In another embodiment, the nut 24 is preset in the second receiving groove 144, when the first connecting element 30 is received in the first receiving groove and the second connecting element 40 is disposed on a side of the second connecting element 40 away from the nut 24, one side of the rod portion 224 passes through the second through hole 48 and the first through hole 322 to reach the nut 24, so that the nut 24 is sleeved on the rod portion 224, and the head portion 222 abuts against the second connecting element 40 and a side away from the first connecting element 30.

Referring to fig. 11, the present application also provides an electric vehicle 400 including the battery module 200, wherein the electric vehicle 400 includes, but is not limited to, an electric automobile, an electric motorcycle, and the like.

The present application also provides an electric vehicle 400 comprising the battery system 300, the electric vehicle 400 including but not limited to an electric automobile, an electric motorcycle, and the like.

The application provides a connection structure 100, through inciting somebody to action fixed subassembly 10 is fixed to be set up on battery module 200's shell 210, first connecting piece 30 is fixed set up in on the fixed subassembly 10, when utmost point ear 230 set up in when first connecting piece 30 is last, can prevent effectively that battery module 200 from receiving external force and influencing, utmost point ear 230 is dragged.

Although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.

Claims

1. A connection structure for a battery module, comprising:

at least one fixing component arranged on the side of the battery module; and

2. The connection structure as claimed in claim 1, wherein the fixing member includes a fixing portion formed with fixing grooves for fixing with the sides of the battery module.

3. The connecting structure according to claim 2, wherein a buckle is disposed on a side wall of the fixing groove, a clamping hole is disposed on a side edge of the battery module, and the buckle is buckled in the clamping hole; or the side wall of the fixing groove is provided with the clamping hole, the side edge of the battery module is provided with the buckle, and the buckle is buckled in the clamping hole.

4. The connecting structure of claim 2, wherein the fixing component comprises a connecting portion connected to the fixing portion, the connecting portion defines a first receiving slot, and the first connecting member is partially or completely received in the first receiving slot.

5. The connection structure according to claim 4, further comprising a fixing member that fixes the fixing member and the first connecting member.

6. The connecting structure according to claim 5, wherein the fixing member includes a bolt including a head and a nut; the first connecting piece is provided with a through hole, and the fixing assembly comprises a second accommodating groove arranged on the bottom wall of the first accommodating groove; the bolt penetrates through the through hole and the first accommodating groove, and the second accommodating groove accommodates the head or the nut, so that the fixing assembly and the first connecting piece are fixed.

7. The connecting structure according to claim 6, wherein a second positioning portion is disposed on a side wall of the first receiving groove, and the second positioning portion is engaged with the first connecting member received in the first receiving groove.

8. The connection structure according to claim 1, further comprising a fastening member, wherein the fixing member is connected with the battery module by the fastening member.

9. The connecting structure according to claim 6, further comprising a second connecting member connecting two of the first connecting members adjacently disposed, the second connecting member including a through hole configured with the first connecting member and configured with the nut and the bolt to fix the second connecting member, the first connecting member, and the fixing member.

10. The utility model provides a battery module which characterized in that, battery module includes:

a housing;

a tab; and

the connecting structure as set forth in any one of claims 1 to 9, wherein said fixing member is fixedly provided on said housing, and said tab is attached to said first connecting member.

11. A battery system, comprising:

at least two battery modules as set forth in claim 8, the connecting structures on two of the battery modules being disposed adjacent to each other;

12. The battery system according to claim 11, wherein the second connection member is provided with a bending region including a first connection region, a second connection region, and a connection portion connecting the first connection region and the second connection region, the bending region protruding between the first connection region and the second connection region.

13. A battery system, comprising:

at least two battery modules, wherein each battery module comprises a shell, a tab and the connecting structure according to claim 6 or 7, the connecting structures on the two battery modules are adjacently arranged, the fixing assemblies are fixedly arranged on the shells, and the tabs are connected to the first connecting pieces;

the second connecting piece is respectively connected to the first connecting pieces on the two battery modules and comprises through holes configured with the first connecting pieces; and

14. An electric vehicle characterized by comprising the battery module according to claim 10.

15. An electric vehicle characterized in that it comprises a battery system according to any one of claims 11 to 13.