CN112928398A - Battery module - Google Patents

Abstract

The invention discloses a battery module, which comprises a battery module, wherein the battery module comprises: a plurality of batteries and busbar are formed with utmost point ear on every battery, and the end at the battery is established to utmost point ear, and the busbar includes: a plurality of V-arrangements portion and first connecting portion of bending, the V-arrangement portion of bending is formed into the V-arrangement by a wide margin, a plurality of consecutive V-arrangements portion of bending and a plurality of utmost point ear one-to-one setting, every V-arrangement portion of bending's top is formed with the fluting, utmost point ear is suitable for to weld in fluting department, the fluting extending direction is the same with the extending direction of the V-arrangement portion of bending, on the fluting extending direction, fluting length is less than the length of utmost point ear, first connecting portion are located between two adjacent V-arrangements portions of bending, first connecting portion are suitable for to separate two adjacent V-arrangements portions of bending. According to the battery module provided by the embodiment of the invention, the flow guiding capacity of the bus bar can be improved, and the production efficiency can also be improved.

Description

Battery module

Technical Field

The invention relates to the technical field of battery power supplies, in particular to a battery module.

Background

At present, a metal bus bar with or without pole lug grooves is used in the market for connecting a soft package battery core, and generally, after a plurality of through grooves are arranged on the bus bar, pole lugs penetrate through the grooves and are welded on the bus bar in a turnover mode, wherein the flow conductivity of the bus bar is weakened in a grooving mode; after the bus bar without the lug grooves is used, the welding difficulty between the lugs and the bus bar is increased, the problem of insufficient welding is easily caused, and finally the production efficiency is low.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a battery module, which can improve the current guiding capability of a bus bar and can also improve the production efficiency.

According to the battery module of the embodiment of the present invention, the battery module includes a battery module including: a plurality of batteries and busbar are formed with utmost point ear on every battery, and the end at the battery is established to utmost point ear, and the busbar includes: a plurality of V-arrangements portion and first connecting portion of bending, the V-arrangement portion of bending is formed into the V-arrangement by a wide margin, a plurality of consecutive V-arrangements portion of bending and a plurality of utmost point ear one-to-one setting, every V-arrangement portion of bending's top is formed with the fluting, utmost point ear is suitable for to weld in fluting department, the fluting extending direction is the same with the extending direction of the V-arrangement portion of bending, on the fluting extending direction, fluting length is less than the length of utmost point ear, first connecting portion are located between two adjacent V-arrangements portions of bending, first connecting portion are suitable for to separate two adjacent V-arrangements portions of bending.

Therefore, according to the battery module provided by the embodiment of the invention, the length of the groove at the top end of the V-shaped bending part is smaller than that of the tab, whether the tab is installed in place can be detected visually through the contact point of the tab and the groove, the assembly steps are simplified, the inspection is convenient, and meanwhile, whether the tab is in good contact with the bus bar can be detected. Through utmost point ear do not stretch out the fluting setting to make utmost point ear can be welded in the fluting of busbar, can increase the area of overflowing of busbar, and then improved the water conservancy diversion ability of busbar, weld in the fluting department of busbar, can reduce the welding degree of difficulty, still conveniently detect welded firm degree, improve production efficiency.

In addition, according to the battery module of the present invention, the following additional features may be provided:

in some embodiments of the invention, the opening of the slot is gradually increased upwards, and the width of the opening at the lower end of the slot is larger than the width of the tab in the projection of the horizontal plane.

Optionally, the tab includes: the bulge is located keeping away from of utmost point ear one side of battery, the bulge stretches into in the fluting, on the upper and lower direction, the height of bulge is less than slotted height.

In some embodiments of the present invention, the battery module further comprises a battery separator adapted to separate adjacent two of the batteries.

Optionally, the busbar is equipped with a plurality ofly, and is a plurality of the busbar is end to end connection forms the busbar group in proper order, at least one end of busbar group is formed with straight spacing portion.

In some embodiments of the present invention, in the busbar set, at least one overlapping portion is formed on each of two adjacent busbars, and the two busbars are adapted to be overlapped and connected by two overlapping portions.

Alternatively, the lap joint may be constituted by a flat plate.

Optionally, the battery module is provided with a plurality of battery modules, at least one end of the busbar set of each battery module is formed with a second connecting portion, a connecting hole is formed on the second connecting portion, and a fastening device is adapted to be matched with the connecting hole to fasten two adjacent battery modules.

In some embodiments of the present invention, the tab is welded to the bus bar by at least one of laser welding, argon arc welding and brazing.

In other embodiments of the present invention, the bending part of the V-shaped bending part is rounded.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

fig. 2 is a schematic structural view illustrating a manner in which tabs of a battery module are coupled to bus bars according to an embodiment of the present invention;

fig. 3 is a schematic structural view illustrating another manner of coupling tabs of a battery module with bus bars according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 5 is an enlarged view of area B of FIG. 4;

fig. 6 is a schematic structural view of a bus bar group of one form of a battery module according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a bus bar set according to another form of the battery module according to the embodiment of the present invention.

Reference numerals:

1: a battery module: 11: a battery; 111: a tab; 1111: a projection; 12: a bus bar; 121: a V-shaped bending part; 1211: grooving; 1212: a V-shaped limiting part; 122: a first connection portion; 123: a lap joint section; 13: a bus bar group; 131: a straight limiting part; 132: a second connecting portion; 1321: connecting holes;

2: a battery separator.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "height", "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A battery module according to an embodiment of the present invention will be described below with reference to fig. 1 to 7.

As shown in fig. 1 to 7, a battery module according to an embodiment of the present invention includes a battery module 1, the battery module 1 including: a plurality of cells 11 and a bus bar 12.

Specifically, each battery 11 is formed with a tab 111, and the tab 111 is disposed at an end of the battery 11, for example, as shown in fig. 1, the tabs 111 may be disposed at two ends of the battery 11, respectively, and the tabs 111 at two ends of the battery 11 may be connected to the bus bar 12 by disposing the tabs 111 at two ends of the battery 11, so that the bus bar 12 may connect a plurality of batteries 11 in series or in parallel to meet actual use requirements of working conditions.

The bus bar 12 includes: the tab structure comprises a plurality of V-shaped bending portions 121 and a first connecting portion 122, wherein the V-shaped bending portions 121 connected in sequence and the tabs 111 are arranged in a one-to-one correspondence manner, that is, one V-shaped bending portion 121 can be connected with one tab 111 in a matching manner, wherein the plurality of V-shaped bending portions are two or more.

The V-shaped bent portions 121 are formed in a substantially V-shape, a slot 1211 is formed at the top of each V-shaped bent portion 121, the extending direction of the slot 1211 is the same as the extending direction of the V-shaped bent portion 121, and the length of the slot 1211 in the extending direction of the slot 1211 is smaller than the length of the tab 111.

That is, by bending the bus bar 12 in a V shape, the tab 111 on the battery 11 can be easily engaged with the V-shaped bent portion 121, and after the tab 111 is engaged with the V-shaped bent portion 121, the tab 111 can move toward the slot 1211 along the V-shaped bent portion 121, so that the tab 111 can be engaged with the slot 1211, which not only simplifies the assembly steps, but also improves the installation efficiency of the tab 111.

In the specific example shown in fig. 2 to 3, V-shaped limiting portions 1212 are formed at both ends of the V-shaped bending portion 121 in the extending direction, a slot 1211 is formed between the two V-shaped limiting portions 1212, the tab 111 is adapted to abut against the two V-shaped limiting portions 1212 so that the tab 111 does not protrude out of the slot 1211, and at the same time, an operator can detect whether the tab 111 is mounted in place and whether the tab 111 is in good contact with the busbar 12 through the slot 1211,

further, the tab 111 is suitable for being welded at the slot 1211, so that the tab 111 can be welded inside the slot 1211 because the tab 111 cannot extend out of the slot 1211, further, the slot 1211 can be welded and filled, thereby increasing the flow area of the busbar 12, further improving the flow guiding capability of the busbar 12, and reducing and lightening the busbar 12 under the same flow guiding requirement, thereby saving the cost. The tab 111 and the bus bar 12 are welded together at the slot 1211, which not only reduces the welding difficulty, but also facilitates the detection of the welding firmness, thereby improving the production efficiency. After the tabs 111 are welded with the bus bar 12 to form an integral structure, each battery 11 transmits current to the bus bar 12 through the tabs 111, so that the bus bar 12 can connect a plurality of batteries 11 in series or in parallel, and further meets the working requirement.

First connecting portion 122 is disposed between two adjacent V-shaped bending portions 121, first connecting portion 122 is suitable for separating two adjacent V-shaped bending portions 121, that is, first connecting portion 122 can be disposed between two adjacent V-shaped bending portions 121, by disposing first connecting portion 122 between two V-shaped bending portions 121, two connected V-shaped bending portions 121 can be well connected together, and an installation space can be provided for a plurality of batteries 11 matched with busbar 12, so that the plurality of batteries 11 can be well stacked together, thereby enabling the plurality of batteries 11 to dissipate heat, and further protecting the batteries 11, and improving safety.

Therefore, according to the battery module provided by the embodiment of the invention, the length of the slot 1211 at the top end of the V-shaped bending part 121 is smaller than that of the tab 111, and whether the tab 111 is mounted in place and contacts well can be visually detected through the contact point of the tab 111 and the slot 1211, so that the assembly steps are simplified, and the inspection is convenient. The tab 111 does not extend out of the slot 1211, so that the tab 111 can be welded in the slot 1211 of the bus bar 12, the slot 1211 is filled, the overflowing area of the bus bar 12 is increased, the flow conductivity of the bus bar 12 is improved, meanwhile, the tab is welded at the slot 1211 of the bus bar 12, the welding difficulty can be reduced, the welding firmness degree can be conveniently detected, and the production efficiency is improved.

In some embodiments of the present invention, the opening of the slot 1211 increases upward gradually, and in the projection of the horizontal plane, the width of the opening at the lower end of the slot 1211 is greater than the width of the tab 111, for example, as shown in fig. 2, by setting the opening of the slot 1211 to increase upward gradually, after the tab 111 is inserted into the slot 1211, it is possible to more conveniently and visually detect whether the tab 111 is fitted in place, so that the work efficiency can be improved. Further, the width of the opening of the lower end of the slot 1211 in the left-right direction shown in fig. 2 is greater than the width of the tab 111 in the left-right direction, so that the tab 111 can be more conveniently inserted into the slot 1211, and after the tab 111 is inserted into the slot 1211, the tab 111 and the bus bar 12 can be welded together through the opening of the upper end of the slot 1211, which not only reduces the difficulty of welding, but also improves the effect of welding between the tab 111 and the bus bar 12.

In a specific example, the width of the opening at the lower end of the slot 1211 is the same as the width of the tab 111, so that after the tab 111 is inserted into the slot 1211, the tab 111 can be fully contacted with the slot 1211, and the slot 1211 can limit the tab 111, so that the tab 111 can better transmit the current in the battery 11 to the bus bar 12, and the current guiding efficiency of the bus bar 12 can be improved.

It is understood that the width of the opening of the lower end of the slot 1211 and the width of the tab 111 may be set according to actual production needs, and is not particularly limited herein.

Optionally, the tab 111 includes a protrusion 1111, the protrusion 1111 is located on a side of the tab 111 away from the battery 11, the protrusion 1111 extends into the slot 1211, and the height of the protrusion 1111 is smaller than the height of the slot 1211 in the up-down direction.

For example, as shown in fig. 4 and 5, the protrusion 1111 may be formed at the end of the tab 111 extending toward the bus bar 12 and coupled to the slot 1211 of the bus bar 12, and the protrusion 1111 may be extended into the slot 1211 to limit the protrusion 1111 in the left and right direction by extending the protrusion 1111 of the tab 111 into the slot 1211, so that the tab 111 may be coupled to the bus bar 12 more firmly, and the assembly process may be simplified. Further, by setting the height of the protruding portion 1111 to be smaller than the height of the slot 1211, the protruding portion 1111 can be welded inside the slot 1211, and the slot 1211 can be filled, so that the flow area of the bus bar 12 can be increased, the current guiding capability of the bus bar 12 can be improved, and the welding effect between the tab 111 and the bus bar 12 after the tab 111 protrudes out of the slot 1211 can be prevented from being affected.

Further, the battery module further includes a battery separator 2, and the battery separator 2 is adapted to separate two adjacent batteries 11, for example, as shown in fig. 1-3, by disposing the battery separator 2 between two adjacent batteries 11, not only the two adjacent batteries 11 can be kept insulated from each other, but also the batteries 11 can better dissipate heat, thereby improving the safety of the battery module.

In some embodiments of the present invention, a plurality of the busbars 12 are provided, and the plurality of the busbars 12 are sequentially connected end to form the busbar group 13, that is, a plurality of the busbars 12 may be provided in the battery module, and the plurality of the busbars 12 may be sequentially connected to form the busbar group 13, so that the plurality of the batteries 11 connected to the plurality of the busbars 12 in series and/or in parallel can be connected by connecting the busbar group 13.

Further, at least one end of the bus bar group 13 is formed with a straight position-limiting portion 131, that is, the straight position-limiting portion 131 may be formed at one end of the bus bar group 13, or the straight position-limiting portions 131 may be formed at both ends of the bus bar group 13. It can be understood that, when the plurality of batteries 11 are connected in series or in parallel through the bus bar group 13, some two adjacent bus bar groups 13 need to be not contacted, for example, as shown in fig. 2 and 3, the extending length of the straight limiting portion 131 in the left-right direction is smaller than the distance between two adjacent tabs 111, thereby the plurality of batteries 11 can be connected in series or in parallel better, and meanwhile, by providing the straight limiting portion 131, the difficulty in producing the bus bar 12 can be reduced, and the V-shaped bent portion 121 at the end of the bus bar 12 can be prevented from being incomplete.

Alternatively, in the busbar set 13, at least one overlapping portion 123 is formed on each of two adjacent busbars 12, and the two busbars 12 are adapted to be connected in an overlapping manner through the two overlapping portions 123, that is, in the two adjacent busbars 12, one end of each busbar 12 may be set as the overlapping portion 123, both ends of the two adjacent busbars 12 may be set as the overlapping portion 123, both ends of one busbar 12 may be the overlapping portion 123, and one end of the other adjacent busbar 12 is the overlapping portion 123, which is not limited herein. Further, by overlapping the overlapping portions 123 of the two busbars 12, the two busbars 12 can be connected together, so that current can flow from one busbar 12 to the other busbar 12, thereby achieving series and/or parallel connection of the plurality of cells 11.

In one example, one end of the bus bar 12 is provided with the overlapping portion 123, and the other end of the bus bar 12 is provided with the straight position-limiting portion 131, so that the end portion provided with the overlapping portion 123 can be overlapped with the overlapping portion 123 of the adjacent bus bar 12, thereby allowing current to flow in the two connected bus bars 12, and the end of the bus bar 12 provided with the straight position-limiting portion 131 is not connected with the adjacent bus bar 12, so that current cannot flow from the end portion to the other bus bar 12.

In another example, the overlapping portions 123 are provided at both ends of the bus bar 12, and the overlapping portions 123 at both ends of the bus bar 12 may overlap with the overlapping portions 123 of the adjacent bus bar 12, so that current may flow from both ends of the bus bar 12 to the adjacent bus bar 12, thereby realizing the series connection and/or the parallel connection of the plurality of batteries 11.

Alternatively, the overlapping parts 123 may be formed of flat plates, for example, as shown in fig. 2 and 3, by forming the outer shape of the overlapping parts 123 into a flat plate shape, two adjacent overlapping parts 123 may be overlapped together more conveniently, so as to improve the working efficiency, and also, the overlapping parts 123 overlapped together may be in sufficient contact, so as to improve the flow guiding effect of the busbar 12, and also, the manufacturing of the overlapping parts 123 may be facilitated, so as to reduce the production cost and improve the production efficiency.

In one example, the outer shape of the overlapping portion 123 may be a V shape, and by setting the outer shape of the overlapping portion 123 to be the V shape, two adjacent overlapping portions 123 may be matched together through the V shape, so that the two overlapping portions 123 may be well overlapped together, and thus the bus bar 12 may conduct current.

It is understood that the outer shape of the overlapping portion 123 may be other shapes such as circular arc, wave shape, etc., and is not limited herein.

Alternatively, the battery module 1 is provided with a plurality of battery modules 1, at least one end of the bus bar group 13 of each battery module 1 is formed with the second connecting portion 132, the second connecting portion 132 is formed with a connecting hole 1321, and the fastening device is adapted to be matched with the connecting hole 1321 to fasten two adjacent battery modules 1, that is, the second connecting portion 132 may be provided at one end of the bus bar group 13 of each battery module 1, the second connecting portions 132 may also be provided at both ends of the bus bar group 13, and the number of the second connecting portions 132 may be set according to actual working conditions, which is not limited herein. Through being equipped with connecting hole 1321 on second connecting portion 132 for fastener can cooperate connecting hole 1321, thereby makes two adjacent battery module 1 can link together more firmly, and then makes the electric current can be in the water conservancy diversion on the busbar 12 of two battery module 1 that link to each other, in order to satisfy the work actual need.

In one example, corners of the second connection portion 132 are rounded, for example, as shown in fig. 6, and by providing chamfers at two corners of the second connection portion 132, scratching of workers and other objects can be prevented. The size of the rounded corner at the end corner of the second connecting portion 132 may be set according to practical situations, and is not limited herein.

In some embodiments of the present invention, the welding manner of the tab 111 and the bus bar 12 is at least one of laser welding, argon arc welding and brazing, that is, the welding manner between the tab 111 and the bus bar 12 may be in laser welding, argon arc welding or brazing, or in combination welding in two of laser welding, argon arc welding and brazing, or in combination welding in three of laser welding, argon arc welding and brazing. Of course, it is understood that the welding between the tab 111 and the bus bar 12 may be performed in other manners, such as ultrasonic welding, but is not limited thereto.

In an embodiment of the present invention, the bending portion of the V-shaped bending portion 121 is rounded, so that the bending portion of the V-shaped bending portion 121 can be prevented from scratching a worker or other objects by rounding the bending portion of the V-shaped bending portion 121, and after welding the groove 1211 of the V-shaped bending portion 121, the V-shaped bending portion 121 has a more beautiful appearance.

In the description herein, references to the description of the terms "some embodiments," "optionally," "further," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery module, comprising a battery module, the battery module comprising:

the battery comprises a plurality of batteries, wherein each battery is provided with a tab, and the tab is arranged at the end part of the battery;

a busbar, the busbar comprising:

the V-shaped bending parts are generally formed into a V shape, the V-shaped bending parts which are sequentially connected are arranged in one-to-one correspondence with the lugs, an open groove is formed in the top of each V-shaped bending part, the lugs are suitable for being welded at the open groove, the extending direction of the open groove is the same as that of the V-shaped bending parts, and the length of the open groove is smaller than that of the lugs in the extending direction of the open groove;

the first connecting portion is arranged between the two adjacent V-shaped bending portions and is suitable for separating the two adjacent V-shaped bending portions.

2. The battery module according to claim 1, wherein the opening of the slot is gradually increased upward, and the width of the opening at the lower end of the slot is greater than the width of the tab in a projection on a horizontal plane.

3. The battery module according to claim 1, wherein the tab comprises: the bulge is located keeping away from of utmost point ear one side of battery, the bulge stretches into in the fluting, on the upper and lower direction, the height of bulge is less than slotted height.

4. The battery module according to claim 1, further comprising:

a battery separator adapted to separate adjacent two of said batteries.

5. The battery module as set forth in claim 1, wherein a plurality of the bus bars are provided, the plurality of the bus bars are sequentially connected end to form a bus bar group, and at least one end of the bus bar group is formed with a straight position-limiting portion.

6. The battery module according to claim 5, wherein at least one overlapping portion is formed on each of adjacent two of the bus bars in the bus bar group, and the two bus bars are adapted to be overlapped by the two overlapping portions.

7. The battery module according to claim 6, wherein the overlapping part may be formed of a flat plate.

8. The battery module according to any one of claims 5, wherein the battery module is provided in plurality, at least one end of the bus bar group of each battery module is formed with a second connecting portion on which a coupling hole is formed, and a fastening means is adapted to be engaged with the coupling hole to fasten the adjacent two battery modules.

9. The battery module according to claim 1, wherein the tab is welded to the bus bar by at least one of laser welding, argon arc welding, and brazing.

10. The battery module according to claim 1, wherein the bending part of the V-shaped bending part is rounded.

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