CN212113828U - Battery module - Google Patents

Abstract

The utility model provides a battery module, which comprises a busbar, wherein the busbar comprises a metal bearing sheet, and the metal bearing sheet is fixed on a first side surface of a bracket of the battery module and is electrically connected with a lug of an electric core of the battery module; and a reinforcing sheet is attached to the side surface of the metal bearing sheet, which is back to the battery core. The strength of the bus bar can be improved through the reinforcing sheet, and the stability of the bus bar is improved.

Description

Battery module

Technical Field

The utility model relates to a lithium ion battery technical field especially relates to a battery module.

Background

A lithium ion Energy Storage System (BESS) is the most widely applied Energy Storage System, and in comparison, the BESS has the advantages that: firstly, the cost is low, the technology is mature, and the charge-discharge multiple is high; secondly, the modularity is good, and the distributed energy storage device can be used.

At present, the bus bar in the lithium ion battery module is easy to deform or move down due to the effects of bearing and self gravity, so that the stability of the bus bar is influenced, and the normal work of the battery module is further influenced.

Therefore, the stability of the bus bar of the lithium ion battery module in the prior art is poor.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a battery module has solved the relatively poor problem of stability of the busbar of lithium ion battery module among the prior art.

In order to achieve the above object, an embodiment of the present invention provides a battery module, which includes a bus bar, where the bus bar includes a metal carrying sheet, the metal carrying sheet is fixed on a first side surface of a support of the battery module, and the first side surface is a side surface of the support facing away from an electrical core and electrically connected to a tab of the electrical core of the battery module; and a reinforcing sheet is attached to the side surface of the metal bearing sheet, which is back to the battery core.

Optionally, the reinforcing sheet is made of a ceramic material.

Optionally, the battery module includes at least one battery assembly, each battery assembly includes a first support and a battery core, the first support supports the battery core, and the first supports of each battery assembly are stacked and connected to form the support; the first support comprises a first sub-side surface facing the metal bearing sheet, and the first side surface comprises the first sub-side surface; and positive and negative electrode fool-proofing assemblies are arranged on the first sub-side surfaces.

Optionally, the metal carrying sheet is fixed on the first sub-side surfaces of two adjacent first brackets.

Optionally, the battery module further includes a first pressing plate, a second pressing plate and a binding band, the first pressing plate is pressed on a second side surface of the bracket, the second side surface is adjacent to the first side surface, the second pressing plate is pressed on a third side surface of the bracket, and the third side surface is opposite to the second side surface;

the side surface of the first pressing plate, which is back to the bracket, is provided with a first groove, the side surface of the second pressing plate, which is back to the bracket, is provided with a second groove corresponding to the first groove, and the binding belt is clamped in the first groove and the second groove.

Optionally, the battery module further includes an end cover, the end cover is disposed on one side of the busbar back to the battery core, and the end cover is fixed to the support.

Optionally, the end cap is clamped to the bracket.

Optionally, a handle part is arranged on the cover edge of the end cover, and a through hole is formed in the handle part; the battery module further comprises a handle which can be inserted into the through hole to pry the end cover.

Optionally, the battery module further includes a pressing piece, the pressing piece is disposed on the end cap, the pressing piece includes a pressing piece and a fixing piece, the fixing piece sequentially penetrates through the pressing piece and the end cap and is fixed on the bracket, and the pressing piece is abutted to a side plate of the end cap, which faces away from the bracket.

One of the above technical solutions has the following advantages or beneficial effects:

the embodiment of the utility model provides a battery module, including the busbar, the busbar includes the metal bearing piece, the metal bearing piece is fixed in on the first side of the support of battery module, and with the utmost point ear electricity of the electric core of battery module is connected; and a reinforcing sheet is attached to the side surface of the metal bearing sheet, which is back to the battery core. The strength of the bus bar can be improved through the reinforcing sheet, and the stability of the bus bar is improved.

Drawings

Fig. 1 is a perspective view of a battery module according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a bus bar in a battery module according to an embodiment of the present invention;

fig. 3 is a second schematic structural view of a bus bar in a battery module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a battery assembly of a battery module according to an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion A of FIG. 4;

fig. 6 is a schematic structural view of a first pressing plate or a second pressing plate in a battery module according to an embodiment of the present invention;

fig. 7 is a perspective view of a battery module according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an end cap in a battery module according to an embodiment of the present invention;

fig. 9 is a partial schematic view of a battery module according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to 9, an embodiment of the present invention provides a battery module.

As shown in fig. 1, the battery module includes a bus bar 100, where the bus bar 100 includes a metal carrier sheet 110, and the metal carrier sheet 110 is fixed on a first side surface of a support 200 of the battery module and electrically connected to a tab of a battery cell 300 of the battery module; the side of the metal carrier sheet 110 facing away from the battery cell 300 is attached with a reinforcing sheet 120.

The metal carrier sheet 110 may be made of a metal conductive material, such as copper; the metal carrier sheet 110 may be fixed to the bracket 200 by bolts, or may be fixed by clamping, which is not limited herein; the reinforcing sheet 120 may be made of a metal material or a non-metal material, and is attached to a side of the metal carrier sheet 110 facing away from the battery cell 300, where the side of the metal carrier sheet 110 facing away from the battery cell 300 may be understood as an outer side of the metal carrier sheet 110 shown in fig. 1.

The embodiment of the present invention provides an embodiment, for preventing that busbar 100 is buckled and deformed or move down because of bearing or self action of gravity, add one in the outside of busbar 100's metal bearing piece 110 and strengthen piece 120, improve busbar 100's intensity, improve busbar 100's steadiness.

As shown in fig. 2, the shape and area of the reinforcing plate 120 can be the same as those of the metal carrier plate 110 of the bus bar, that is, the reinforcing plate 120 can be made into a whole piece and attached to the outer side of the metal carrier plate 110, based on the existence of the reinforcing plate 120, the metal carrier plate 110 can be thinned to save the amount of metal material, and the reinforcing plate 120 can use a metal material or a non-metal material with lower cost to reduce the cost of the battery module; further, in order to save the material of the reinforcing plate 120, as shown in fig. 3, the reinforcing plate 120 may be formed in a strip shape to be attached to the bolts for fixing the bus bar 100 and the bracket 200, which is not limited herein.

Optionally, the reinforcing plate 120 is made of a ceramic material, which further reduces the cost of the busbar 100. It should be noted that other materials with lower cost can be used for the reinforcing sheet 120, and the invention is not limited thereto.

Optionally, the battery module includes at least one battery assembly, each battery assembly includes a first support 210 and a battery cell 300, the first support 210 supports the battery cell 300, and the first supports 210 of each battery assembly are stacked and connected to form the support 200; the first bracket 210 comprises a first sub-side surface facing the first side surface, and the first side surface comprises the first sub-side surface;

and positive and negative electrode fool-proofing assemblies are arranged on the first sub-side surfaces.

In this embodiment, a plurality of battery modules in the battery module are connected in a stacked manner through the first support 210 in each battery module, and the battery core 300 of each battery module is supported by the first support 210. As shown in fig. 4, the first support 210 may be an enclosing frame with a hollow middle portion, and the battery cell 300 is accommodated and fixed in an accommodating space formed by the hollow middle portion of the first support 210. Like this, through the range upon range of a plurality of battery pack of connection of first support 210, reduced battery module thickness direction's size, improved battery module overall structure's stability simultaneously, first support 210 still can protect the electric core 300 of accomodating therein.

In some embodiments, the thickness of the first bracket 210 is generally thicker at the frame position based on the requirement of the first bracket 210 for carrying, and during the injection molding process, if the thickness of the first bracket 210 is too thick, shrinkage is easily caused, which affects the mechanical properties of the first bracket 210, and based on this, the first bracket 210 may be subjected to appropriate glue reduction treatment to improve the injection molding performance of the first bracket 210.

In this embodiment, the first support 210 includes a first sub-side surface facing the metal carrier sheet 110, the first side surface includes the first sub-side surface, and a fool-proof assembly for prompting the positive electrode and the negative electrode is disposed on the first sub-side surface. Specifically, as shown in fig. 5, the positive and negative fool-proof assembly includes a first fool-proof mark 211 for prompting the positive electrode, and a second fool-proof mark 212 for prompting the negative electrode. Thus, when the bus bar 100 is installed, the situation that the positive electrode and the negative electrode are reversely arranged can be avoided, and when the battery module is actually applied, the situation that the positive electrode and the negative electrode of external equipment are reversely connected can be avoided, and the safety of the battery module is improved.

In this embodiment, the tabs of the battery cells 400 in the battery module are electrically connected to the bus bar 800. For example, as shown in fig. 5, the connection assembly 213 on the right side of the first bracket 210 is fixedly connected to the busbar 100 in the right row shown in fig. 1, the busbar 100 in the right row is electrically connected to the positive electrode tab of the battery cell 300, and correspondingly, the first fool-proof mark 211 for prompting the positive electrode may be disposed on the right side of the first bracket 210; as shown in fig. 5, the connection assembly 214 on the left side of the first bracket 210 is fixedly connected to the bus bar 100 in the left row as shown in fig. 1, the bus bar 100 in the left row is electrically connected to the negative electrode tab of the battery cell 300, and correspondingly, a second fool-proof mark 212 for prompting the negative electrode may be disposed on the left side of the first bracket 210.

Further, the metal carrier sheet 110 is fixed on the first sub-side of two adjacent first brackets 210.

In this embodiment, the metal carrying sheet 110 of the bus bar 100 can be fixed on two adjacent first brackets 210, as shown in fig. 1, so as to further improve the stability of the bus bar 100. It is understood that a plurality of bus bars 100 may be disposed on the first side of the bracket of the battery module, and the plurality of bus bars 100 may be disposed at intervals, which is not limited herein.

Optionally, as shown in fig. 1, the battery module further includes a first pressing plate 400, a second pressing plate 500, and a binding band 600, the first pressing plate 400 is pressed on a second side surface of the bracket 200, the second side surface is adjacent to the first side surface, the second pressing plate 500 is pressed on a third side surface of the bracket 200, and the third side surface is opposite to the second side surface;

a first groove 410 is formed on the side of the first pressing plate 400 facing away from the bracket 200, and a second groove 510 corresponding to the first groove 410 is formed on the side of the second pressing plate 500 facing away from the bracket 200; the tying band 600 is caught in the first and second grooves 410 and 510.

The second side of the support 200 can be understood as the upper side in fig. 1, the first pressure plate 400 can be understood as the upper pressure plate, the third side of the support 200 can be understood as the lower side in fig. 1, and the second pressure plate 500 can be understood as the lower pressure plate. For example, the first and second pressing plates 400 and 500 may have a structure as shown in fig. 6, and the side thereof facing away from the bracket 200 may be provided with a plurality of limiting ribs and/or a plurality of mounting holes to facilitate the assembly of the battery module with other external devices.

In this embodiment, the plurality of stack-connected battery modules are fixedly compressed by the first and second pressing plates 400 and 500, and then further fastened by the tying band 600, and the tying band 600 may be caught in the first and second grooves 410 and 510 to prevent the tying band 600 from being displaced to loosen the tying. In this way, the stability of the connection between the plurality of battery modules can be further improved.

It is understood that the binding bands 600 may be bound to the fourth and fifth sides of the bracket 200 of the battery module, which may be understood as the right and left sides as shown in fig. 1, so that the binding bands will not bind the bus bars 100 to affect the assembly and disassembly of the bus bars 100.

Optionally, as shown in fig. 7, the battery module further includes an end cap 700, where the end cap 700 is disposed on a side of the busbar 100 opposite to the battery cell 300, and the end cap 700 is fixed to the bracket 200.

The end cap 700 may be clamped to the bracket 200, or may be connected by bolts, which is not limited herein.

In this embodiment, the battery module's electric core 300 is supported inside the battery module's support 200, and the utmost point ear of electric core 300 stretches out from the both sides of battery module and is connected with busbar 100 electricity to copper bar 800 department that leads to the lower left corner as shown in fig. 7 draws forth, so that the battery module is external normal work. The end cap 700 is fixed on the bracket 200, is made of an insulating material, and can protect the extended tabs of the battery cell 300 and the bus bar 100 from contacting or wearing with the outer shell of the battery module, and also can prevent the tabs of the battery cell 300 from being short-circuited, thereby ensuring the normal operation of the battery module.

Further, as shown in fig. 8, a handle 710 is disposed on a cover edge of the end cover 700, and the handle 710 is provided with a through hole.

In this embodiment, a handle 710 is further disposed on the end cap 700, and the handle 710 is disposed on the rim of the end cap 700. The handle 710 may facilitate the operator to pick up and hold the end cap 700 when assembling the battery module. The handle 710 may be disposed on a rim of the end cap 700, or may be disposed on a first side plate of the end cap 700, which is not limited in this embodiment.

In addition, the handle 710 is further provided with a through hole. When the end cover 700 needs to be removed, a removing tool can be inserted into the through hole of the handle 710 to pry the end cover 700, so that the end cover 700 and the bracket 200 which are clamped with each other can be easily separated, and the risk that an operator directly pulls the end cover 700 through the cover edge of the end cover 700 to be injured is reduced.

Or, the battery module further includes a pressing member (not shown in the figure), the pressing member is disposed on the end cap 700, the pressing member includes a pressing sheet and a fixing member, the fixing member sequentially penetrates through the pressing sheet and the end cap 700 and is fixed on the bracket 200, and the pressing sheet abuts against a side plate of the end cap 700, which is opposite to the bracket 200.

In this embodiment, the end cap 700 may be fixed to the bracket 200, and then a pressing member is added to the end cap 700, and a fixing member of the pressing member sequentially penetrates through the pressing sheet and the end cap and then is fixed to the bracket 200, so as to fix the pressing member, the end cap 700, and the bracket 200, and then the pressing sheet of the pressing member abuts against the end cap 700, so as to press the end cap 700 and prevent the end cap 700 from loosening relative to the fixing member, thereby improving the stability of the end cap 700.

The fixing member may be a bolt, a blind hole matched with the bolt may be formed on the first side surface of the bracket 200, and the fixing member is fastened by matching an external thread of the bolt with an internal thread of the blind hole; the mounting also can be for the periphery be equipped with the stand of interval draw-in groove, can open on the first side of support 200 be equipped with above-mentioned stand complex blind hole, the mounting passes through the stand fixed with the grafting of blind hole, in this embodiment, preforming accessible joint realizes the fastening in the draw-in groove of stand periphery. It is understood that the pressing sheet and the fixing member can be fastened to each other, and the form of the fixing member is not limited thereto.

In some embodiments, the pressing plate includes a first pressing plate and an elastic member, the first pressing plate and the elastic member are perpendicularly connected to each other, the fixing member penetrates through the first pressing plate, the first pressing plate abuts against the first side plate, the elastic member abuts against a cover edge of the end cover 700, and the elastic member can generate an elastic force in a direction perpendicular to the end cover 700.

In the above embodiment, while the first pressing plate can press the end cap 700 so that the end cap 700 is not released from the fixing member, the elastic member abuts against the edge of the end cap 700 to perform a limiting function, so that the end cap 700 does not undergo a parallel relative displacement with respect to the bracket 200, thereby further improving the stability of fixing the end cap 700.

In addition, the elastic member may generate an elastic force in a direction perpendicular to the end cap 700, that is, when the first pressing piece presses the end cap 700, a certain pressure may be applied to the elastic member to deform the elastic member. After the first pressing piece is fastened to the fixing piece, the elastic force generated by the elastic piece 812 due to deformation can further make the end cap 700 tightly attached to the first side surface of the bracket 200, which can also further improve the stability of the fixation between the end cap 700 and the bracket 200.

Optionally, end cap 700 is snap fit with bracket 200.

In this embodiment, the end cap 700 and the bracket 200 can be clamped by the fit of the fastener and the fastener groove. Specifically, at least three embodiments may be included: first, a first side surface of the first bracket 210 may be provided with a buckle, and a second side plate of the end cap 700 facing the bracket 200 may be provided with a slot corresponding to the buckle; secondly, a first side surface of the first bracket 210 may be provided with a clamping groove, and a second side plate of the end cover 700 facing the bracket 200 may be provided with a buckle corresponding to the clamping groove; thirdly, the first side surface of the first bracket 210 may be provided with a locking groove and a locking buckle at an interval, and the second side plate of the end cap 700 facing the bracket 200 may be provided with a locking buckle corresponding to the locking groove at an interval, and a locking groove corresponding to the locking buckle.

In some embodiments, when a plurality of battery modules in a battery module are connected in a stacked manner by the first support 210 of each battery module, each first support 210 may include a first sub-side surface facing the end cap 700, and the first side surface is formed by a plurality of first sub-side surfaces; then, a snap structure may be provided on each of the first brackets 310.

Specifically, at least three embodiments are also included: first, a first sub-side surface of each first bracket 210 may be provided with a buckle, and a second side plate of the end cap 700 facing the bracket 200 may be provided with a slot corresponding to the buckle; secondly, a first sub-side surface of each first bracket 210 may be provided with a clamping groove, and a second side plate of the end cover 700 facing the bracket 200 may be provided with a buckle corresponding to the clamping groove; thirdly, the first sub-side of each first bracket 210 may be provided with a locking groove and a locking buckle at intervals, and the second side plate of the end cap 700 facing the bracket 200 may be provided with a locking buckle corresponding to the locking groove at intervals, and a locking groove corresponding to the locking buckle.

In this way, each first bracket 210 is provided with a clamping structure, so that the stability of the fixation between the end cap 700 and the bracket 200 can be further improved. It is understood that, among the plurality of first brackets 210 connected in a stacked manner, a predetermined number of first brackets 210 may be provided at intervals with a snap structure, and the invention is not limited thereto.

In some embodiments, as shown in fig. 9, the cover edge of the end cover 700 is bent to form a bent portion, so that a certain space is formed between the end cover 700 and a tab extending from a battery cell of the battery module, the tab is protected from contacting or rubbing with a housing of the battery module, and the end cover 700 itself keeps a certain distance from the tab, thereby further improving the safety of the battery cell.

Meanwhile, the bent portion of the end cap 700 and the bracket 200 may be engaged with each other by a snap fit, wherein the bent portion may include an inward side as shown in fig. 9, and the side may be provided with a snap fit structure.

Specifically, at least three embodiments may be included: first, as shown in fig. 9, a first side surface of the bracket 200 may be provided with a buckle 220, and an inward side surface of the bent portion of the end cap 700 may be provided with a slot 720 corresponding to the buckle 220; secondly, a first side surface of the bracket 200 may be provided with a clamping groove, and an inward side surface of the bent portion of the end cap 700 may be provided with a buckle corresponding to the clamping groove; thirdly, the first side of the bracket 200 may be provided with a locking groove and a locking buckle at an interval, and the inward side of the bending part of the end cap 700 may be provided with a locking buckle corresponding to the locking groove at an interval, and a locking groove corresponding to the locking buckle.

It is understood that the fixing connection between the end cap 700 and the bracket 200 is not limited thereto, and is not limited thereto.

To sum up, the embodiment of the present invention provides a battery module, which includes a busbar 100, wherein the busbar 100 includes a metal carrier sheet 110, and the metal carrier sheet 110 is fixed on a first side surface of a support 200 of the battery module and is electrically connected to a tab of an electrical core 300 of the battery module; the side of the metal carrier sheet 110 facing away from the battery cell 300 is attached with a reinforcing sheet 120. The reinforcing sheet 120 can improve the strength of the bus bar 100 and improve the stability of the bus bar 100.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A battery module is characterized by comprising a bus bar, wherein the bus bar comprises a metal bearing sheet, and the metal bearing sheet is fixed on a first side surface of a bracket of the battery module and is electrically connected with a tab of an electric core of the battery module; and a reinforcing sheet is attached to the side surface of the metal bearing sheet, which is back to the battery core.

2. The battery module according to claim 1, wherein the reinforcing sheet is made of a ceramic material.

3. The battery module according to claim 1, wherein the battery module comprises at least one battery assembly, each battery assembly comprises a first bracket and a battery core, the first bracket supports the battery core, and the first brackets of each battery assembly are stacked and connected to form the bracket; the first support comprises a first sub-side surface facing the metal bearing sheet, and the first side surface comprises the first sub-side surface;

and positive and negative electrode fool-proofing assemblies are arranged on the first sub-side surfaces.

4. The battery module according to claim 3, wherein the metal carrier sheet is fixed to the first sub-side surfaces of two adjacent first brackets.

5. The battery module according to claim 1, further comprising a first pressing plate, a second pressing plate, and a binding band, wherein the first pressing plate is pressed against a second side surface of the bracket, the second side surface is adjacent to the first side surface, the second pressing plate is pressed against a third side surface of the bracket, and the third side surface is opposite to the second side surface;

the side surface of the first pressing plate, which is back to the bracket, is provided with a first groove, the side surface of the second pressing plate, which is back to the bracket, is provided with a second groove corresponding to the first groove, and the binding belt is clamped in the first groove and the second groove.

6. The battery module of claim 1, further comprising an end cap disposed on a side of the busbar facing away from the cell, the end cap being fixed to the bracket.

7. The battery module of claim 6, wherein the end cap is snap-fit to the bracket.

8. The battery module as recited in claim 6, wherein a handle is disposed on the cover edge of the end cap, and the handle is perforated with a through hole.

9. The battery module as recited in claim 6, further comprising a pressing member disposed on the end cap, wherein the pressing member comprises a pressing piece and a fixing piece, the fixing piece sequentially penetrates through the pressing piece and the end cap and is fixed on the bracket, and the pressing piece abuts against a side plate of the end cap facing away from the bracket.

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