CN210167392U

CN210167392U - Battery module

Info

Publication number: CN210167392U
Application number: CN201920298567.XU
Authority: CN
Inventors: 季林峰; 杨庆亨
Original assignee: Jiangsu Zhong Xingpaineng Battery Co Ltd
Current assignee: Jiangsu Zhong Xingpaineng Battery Co Ltd
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2020-03-20
Anticipated expiration: 2029-03-08

Abstract

The utility model discloses a battery module, including a plurality of battery cell and module support, it is a plurality of battery cell combines and forms a whole through an at least ligature group, battery cell includes anodal utmost point ear and negative pole utmost point ear, anodal utmost point ear and negative pole utmost point ear follow the battery cell is inside to be drawn forth, and adjacent the anodal utmost point ear and the negative pole utmost point ear incurve and welded connection of battery cell form the weld part, the module support is fixed to be set up a plurality of battery cell's top, the weld part is the after-fixing of bending on the module support. The utility model discloses can effectively cushion the vibration that the group battery use produced, avoid making electrode utmost point ear atress cause the damage, can also reduce the internal resistance, improve the availability factor.

Description

Battery module

Technical Field

The utility model relates to a group battery conductive connection field specifically is a battery module.

Background

The battery is an important component for new energy application, is composed of a plurality of battery units when in use, and is finally output through the connecting sheet. The positive electrode lug of the polymer lithium ion battery usually adopts an aluminum lug, and the negative electrode lug generally adopts a copper nickel-plated lug.

When the battery units are combined into a battery module, the common electric connection mode is as follows: firstly, the electric connection is carried out through screw locking, and the mode has some defects, such as the screw is easy to loosen, so that the contact impedance at the connection part is increased, and once the overcurrent accumulates to generate heat, some safety problems are caused; in addition, a laser welding mode can be adopted, because the nickel plating of aluminum and copper belongs to the welding between different metals, the laser welding is very difficult to directly carry out, the tabs are generally required to be converted in a copper-aluminum composite sheet mode, and the same metal welding is carried out by laser welding, the welding mode has the advantages that firstly, the equipment investment is large, secondly, the requirement on the joint state between the tabs during welding is high, the insufficient welding or over-welding condition is easy to occur, in addition, metal splashes generated in the welding process easily cause the short circuit or scratch of a battery cell in the using process of the battery to cause the leakage of the battery, and the like; the welding mode has certain requirements on the surface cleaning state of the pole ear of the battery pole ear, cold welding is easy to occur in the welding process, and in addition, due to high-frequency vibration, improper parameter setting easily causes the cracking of the anode aluminum pole ear, and the overcurrent capacity of the battery is influenced; the other method is soldering, and battery tabs also need to be processed, for example, a positive aluminum tab is subjected to nickel conversion operation and then soldered on a PCB (printed circuit board) for connection among modules.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem lie in overcoming the defect that prior art exists, provide a battery module. The utility model discloses can effectively cushion the vibration that the group battery use produced, avoid making electrode utmost point ear atress cause the damage, can also reduce the internal resistance, improve the availability factor.

In order to achieve the above object, the utility model provides a following technical scheme: a battery module comprises a plurality of battery units, wherein the battery units are combined and integrated into a whole through at least one binding component, each battery unit comprises a positive electrode lug and a negative electrode lug, the positive electrode lugs and the negative electrode lugs are led out from the inside of the battery units, and the positive electrode lugs and the negative electrode lugs of the adjacent battery units are bent inwards and are welded to form a welding part; the module support is fixedly arranged above the plurality of battery units, and the welding part is fixed on the module support after being bent.

Preferably, the middle parts of the positive electrode lug and the negative electrode lug are bent inwards to form an S shape.

Preferably, the welded connection is a brazed connection.

Preferably, 4-6 welding spots are uniformly distributed on the welding part.

Preferably, the module support is provided with a limiting clamping groove and a hasp, and the limiting clamping groove is matched with the hasp and fixes the welding part on the module support.

The utility model provides an among the technical scheme, through bending frock and folding into similar "S" type positive negative pole ear middle part, can effectively cushion the vibration that the group battery use produced, avoid making positive negative pole ear atress cause the damage, the brazed mode of rethread resistance welds the positive negative pole ear of a plurality of battery units, and the course of working is simple, and the reliability is high, and this mode can also reduce the use of busbar, alleviates battery weight, accomplishes the module lightweight to reach the purpose of practicing thrift the cost.

Drawings

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of the battery cell of FIG. 1;

fig. 3 is a partially enlarged view of the positive and negative electrode tabs in fig. 2.

Reference numbers in the figures: 1-battery unit, 2-module support, 3-binding piece, 4-negative pole tab, 5-positive pole tab, 6-brazing sheet and 7-welding part.

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 only some embodiments of the present invention, not all embodiments.

As shown in fig. 1-3, the utility model provides a technical solution: the utility model provides a battery module, includes a plurality of battery cell 1 and module support 2, and a plurality of battery cell 1 are in the same place and form a whole through two 3 combinations of ligature piece, and battery cell 1 includes anodal utmost point ear 5 and negative pole utmost point ear 4, and anodal utmost point ear 5 and negative pole utmost point ear 4 are drawn forth from battery cell 2 is inside, and module support 2 is fixed to be set up in battery cell 1 top.

In this embodiment, the middle parts of the positive electrode tab 5 and the negative electrode tab 4 of the two adjacent battery units 1 are bent inwards by the bending tool to form an S shape, and the S shape design can effectively buffer the vibration generated by the battery module in the use process, so that the damage caused by the stress of the electrode tabs is avoided.

In this embodiment, the upper portions of the positive electrode tab 5 and the negative electrode tab 4 of two adjacent battery units 1 are welded by resistance brazing to form a welded portion 7, and resistance brazing is used to reduce internal resistance and improve the use efficiency.

In this embodiment, module support 2 is provided with spacing draw-in groove and hasp, and spacing draw-in groove and hasp phase-match, weld part 7 is fixed on module support 2 through spacing draw-in groove and hasp after bending.

Further, the component proportion of the brazing filler metal sheet 6 can be improved, the brazing filler metal sheet is used as a positive electrode tab and a negative electrode tab to be connected with a fuse, and when a battery module is short-circuited or under the condition of abnormal large current, the brazing filler metal sheet can be quickly disconnected, so that the battery is prevented from being damaged greatly.

To sum up, the technical scheme of the utility model the vibration that can effectively cushion the battery module use and produce avoids making positive negative pole ear atress cause the damage, and the course of working is simple, and connection reliability is high, can reduce the use of busbar, alleviates battery weight, accomplishes the module lightweight, practices thrift the cost, and is especially very obvious to list and series module advantage, is fit for replacing the energy storage module with the specification, or is also very obvious as partial small-size automobile-used battery module electricity connected mode advantage.

Particularly, on one hand, the connecting structure is reliable, and due to the adoption of the composite pressing brazing sheet 6, the stress influence caused by the difference of thermal expansion coefficients of direct connection among different metals is avoided, so that the connecting structure is loosened, and the resistance value of the connecting part is increased. In addition, due to the adoption of the composite pressing brazing sheet 6, the phenomenon that copper and aluminum directly contact to generate a brittle metal compound such as copper and aluminum eutectic is avoided during welding, so that the welding reliability and the connection reliability and stability are ensured.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A battery module, comprising:

the battery pack comprises a plurality of battery units (1), wherein the battery units (1) are combined through at least one binding piece (3) to form a whole, each battery unit (1) comprises a positive electrode tab (5) and a negative electrode tab (4), the positive electrode tabs (5) and the negative electrode tabs (4) are led out from the inside of the battery unit (1), and the positive electrode tabs (5) and the negative electrode tabs (4) adjacent to the battery units (1) are bent inwards and are welded to form a welding part (7);

the module support (2), module support (2) are fixed to be set up in a plurality of the top of battery unit (1), weld part (7) are fixed after bending on module support (2).

2. The battery module according to claim 1, wherein the middle portions of the positive electrode tab (5) and the negative electrode tab (4) are bent inward to form an "S" shape.

3. The battery module according to claim 1, wherein the welded connection is a soldered connection.

4. The battery module according to claim 1, wherein 4-6 welding spots are uniformly distributed on the welding part (7).

5. The battery module as claimed in claim 1, wherein the module support (2) is provided with a limiting clamping groove and a hasp, and the limiting clamping groove is matched with the hasp and fixes the welding part (7) on the module support (2).