CN115513606B - Battery module connecting structure - Google Patents
Battery module connecting structure Download PDFInfo
- Publication number
- CN115513606B CN115513606B CN202211190383.4A CN202211190383A CN115513606B CN 115513606 B CN115513606 B CN 115513606B CN 202211190383 A CN202211190383 A CN 202211190383A CN 115513606 B CN115513606 B CN 115513606B
- Authority
- CN
- China
- Prior art keywords
- strip
- clamping
- arc
- fixing piece
- battery module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000003466 welding Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a battery module connecting structure, which comprises a plurality of battery cell groups; the battery cell group comprises a plurality of single battery cells; the electrodes at two ends of the battery cell group are respectively and electrically connected with a first connecting sheet and a second connecting sheet; when at least two cell groups are connected in series, the first connecting sheet and the second connecting sheet of the adjacent cell groups are mutually fixed and form surface contact connection. According to the battery module connecting structure, the first connecting sheet and the second connecting sheet are arranged at the two ends of the battery cell groups, when the battery cell groups are connected in series, the first connecting sheet of one battery cell group is fixedly connected with the second connecting sheet of the other battery cell group in a surface contact manner, so that the connecting area of the two battery cell groups is increased, and compared with a traditional point contact manner, larger current can be borne, the current bearing capacity of the whole battery module is improved, and the development requirement of new energy products on large current is met.
Description
[ field of technology ]
The invention relates to the technical field of batteries, in particular to a battery module connecting structure.
[ background Art ]
With the continuous development of battery technology and new energy automobiles, battery modules continue to develop in the direction of large capacity and large current. When the traditional battery module is assembled, a plurality of single batteries form a plurality of parallel battery cell groups through the bus plates, and then the bus plates of the adjacent battery cell groups are welded to form a series connection, so that the battery module comprising the plurality of battery cell groups is assembled. However, the electric core group adopts the electric connection mode that the welding belongs to the point contact, when the electric current that whole battery module output is great, very easily at the welding position of point contact because of too big electric current leads to the too big and fuses that generates heat to influence the use of whole battery module, be unfavorable for satisfying equipment such as new energy automobile to the demand of heavy current.
In view of the foregoing, it is desirable to provide a battery module connecting structure that overcomes the above-mentioned drawbacks.
[ invention ]
The invention aims to provide a battery module connecting structure, which aims to solve the problem that the existing battery module is difficult to bear excessive current at welding points, and improve the electric contact area between adjacent battery cell groups so as to improve the current bearing capacity of the whole battery module.
In order to achieve the above object, the present invention provides a battery module connecting structure, including a plurality of battery cell groups; the battery cell group comprises a plurality of single battery cells; the electrodes at two ends of the battery cell group are respectively and electrically connected with a first connecting sheet and a second connecting sheet; when at least two cell groups are connected in series, the first connecting sheets and the second connecting sheets of the adjacent cell groups are mutually fixed and form surface contact connection.
In a preferred embodiment, the electrodes at two ends of the battery cell group are coaxially fixed with threaded columns, and the first connecting sheet and the second connecting sheet are fixed on the corresponding threaded columns through nuts.
In a preferred embodiment, the first connecting piece includes a first fixing piece and a first clamping portion disposed on a side of the first fixing piece, which is far away from the corresponding connection cell group; the second connecting piece comprises a second fixing piece and a second clamping part which is arranged on one side of the second fixing piece far away from the corresponding connection cell group; the second clamping part is clamped with the first clamping part to form surface contact connection.
In a preferred embodiment, the first engaging portion includes a first clip strip, where the first clip strip includes a first support bar vertically connected to the first fixing piece, and edges of two sides of an end surface of the first support bar far away from one end of the first fixing piece respectively extend outwards in an arc manner to form a first arc strip with a first opening; the second clamping part comprises a second clamping strip, the second clamping strip comprises a second supporting strip vertically connected to the second fixing piece, and the edges of two sides of the end face of one end of the second supporting strip, far away from the second fixing piece, extend outwards to form second arc-shaped strips with second openings respectively; the second arc-shaped strip is clamped into the first arc-shaped strip through the first opening, so that the outer surface of the second arc-shaped strip is in interference butt joint with the inner surface of the first arc-shaped strip.
In a preferred embodiment, the first arcuate strip and the second arcuate strip are circular in cross-section.
In a preferred embodiment, the first opening is formed at one end of the first arc-shaped strip away from the first supporting strip; the second opening is formed in one end, far away from the second supporting bar, of the second arc-shaped bar.
In a preferred embodiment, the first engaging portion includes at least one of the first engaging strip and at least one of the second engaging strip; the second clamping portion comprises at least one second clamping strip which corresponds to the first clamping strips of the first clamping portion one by one, and at least one first clamping strip which corresponds to the second clamping strips of the first clamping portion one by one.
In a preferred embodiment, the lengths of the first clamping strip, the first supporting strip, the second clamping strip and the second supporting strip are consistent with the lengths of the battery cell group along the extending direction of the cross section of the first clamping strip.
In a preferred embodiment, two ends of the first fixing piece and the second fixing piece are respectively connected through a pair of limiting pieces.
In a preferred embodiment, the first connecting piece and the second connecting piece are both aluminum sheets.
According to the battery module connecting structure, the first connecting sheet and the second connecting sheet are arranged at the two ends of the battery cell groups, when the battery cell groups are connected in series, the first connecting sheet of one battery cell group is fixedly connected with the second connecting sheet of the other battery cell group in a surface contact manner, so that the connecting area of the two battery cell groups is increased, and compared with a traditional point contact manner, larger current can be borne, the current bearing capacity of the whole battery module is improved, and the development requirement of new energy products on large current is met.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a battery module connection structure provided by the present invention;
fig. 2 is a perspective view illustrating another angle of the battery module connection structure of fig. 1;
fig. 3 is a front view of the battery module connection structure of fig. 1;
FIG. 4 is an enlarged view of the interior of circle A of FIG. 3;
fig. 5 is a front exploded view of the battery module connection structure of fig. 1;
fig. 6 is an enlarged view of the inside of circle B shown in fig. 5.
Reference numerals in the drawings: 100. a battery module connecting structure; 1. a cell group; 2. a single cell; 3. a threaded column; 4. a nut; 5. a screw; 6. a limiting piece; 10. a first connecting piece; 11. a first fixing piece; 12. a first engagement portion; 121. the first clamping strip; 1211. a first support bar; 1212. a first opening; 1213. a first arcuate strip; 20. a second connecting piece; 21. a second fixing piece; 22. a second engaging portion; 221. a second clamping strip; 2211. a second support bar; 2212. a second opening; 2213. and a second arc-shaped strip.
[ detailed description ] of the invention
In order to make the objects, technical solutions and advantageous technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the invention, and not to limit the invention.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In an embodiment of the present invention, a battery module connecting structure 100 is provided for assembling a plurality of unit batteries into a battery module to meet specific voltage and capacity requirements.
As shown in fig. 1, 2, 3 and 5, the battery module connecting structure 100 includes a plurality of battery cell groups 1. The cell group 1 comprises a plurality of single cells 2. In this embodiment, the unit cell 2 may be a circular lithium battery. Specifically, the single cells 2 in the cell group 1 are stacked in two rows, and each row includes a plurality of single cells 2 which are placed on the same plane and have the same electrode direction. Further, the electrodes at both ends of the battery cell group 1 are coaxially fixed with threaded columns 3. The two ends of each single cell 2 are provided with threaded columns 3, wherein the threaded columns 3 can be fixed at the two ends of the single cell 2 in a welding or clamping mode. The threaded column 3 can be provided with a threaded groove at one end far away from the single cell 2, or can be a threaded column which can be directly matched with the nut 4.
The electrodes at two ends of the battery cell group 1 are respectively and electrically connected with a first connecting sheet 10 and a second connecting sheet 20. For example, the first connecting piece 10 is connected to the threaded posts 3 on all the anodes of the battery cell 1, and the second connecting piece 20 is connected to the threaded posts 3 on all the cathodes of the battery cell 1. The first connecting piece 10 and the second connecting piece 20 are provided with a plurality of through holes (not shown in the figure) corresponding to the threaded columns 3 one by one, one end of the threaded column 3, which is far away from the single battery cell 2, penetrates through the through holes, and then the first connecting piece 10 and the second connecting piece 20 are fixed on the corresponding threaded column 3 through the matching action of the nut 4 and the threaded column 3. In other embodiments, if the threaded post 3 is provided with a threaded hole, the threaded hole is aligned with the corresponding through hole, and then the first connecting piece 10 and the second connecting piece 20 are pressed at two ends of the battery cell group 1 through the cooperation of the screw 5 and the threaded hole.
In one embodiment, the first connecting piece 10 and the second connecting piece 20 are both aluminum sheets. Compared with the traditional copper bus plate, the aluminum sheet is adopted to conduct bus on the battery cell group 1, and the scheme of the aluminum sheet is adopted to enable the whole battery module to be lighter in weight and lower in cost on the premise of meeting electric connection.
In the embodiment of the invention, when at least two battery cell groups 1 are connected in series, the first connecting sheet 10 and the second connecting sheet 20 of the adjacent battery cell groups 1 are mutually fixed and form surface contact connection, namely, the two battery cell groups 1 can be connected in series by clamping or surface welding and other modes so as to improve the electric connection area of the two battery cell groups 1, thereby improving the current carrying capacity of the electric connection structure of the battery module.
Specifically, as shown in fig. 3 to 6, the first connecting piece 10 includes a first fixing piece 11 and a first engaging portion 12 disposed on a side of the first fixing piece 11 away from the corresponding connection cell group 1. The second connecting piece 20 includes a second fixing piece 21 and a second engaging portion 22 disposed on a side of the second fixing piece 21 away from the corresponding connection cell set 1. Wherein, the first fixing piece 11 and the second fixing piece 21 are both used for fixedly connecting the threaded columns 3 on all the electrodes of the corresponding cell groups 1. The second engaging portion 22 engages with the first engaging portion 12 to form a surface contact connection, that is, the first engaging portion 12 and the second engaging portion 22 are detachably engaged, so that subsequent maintenance work is facilitated.
Further, both ends of the first fixing piece 11 and the second fixing piece 21 are respectively connected through a pair of limiting pieces 6. The two sides of the limiting plate 6 can be fixed on the side, close to each other, of the first fixing plate 11 and the second fixing plate 21 in a welding manner or the like, so that the first clamping portion 12 and the second clamping portion 22 are prevented from moving transversely when being clamped, and the stability of the whole battery module connecting structure 100 is improved.
Specifically, as shown in fig. 4 and 6, the first engaging portion 12 includes a first engaging strip 121. The first clamping strip 121 comprises a first supporting strip 1211 vertically connected to the first fixing piece 11, and two side edges of the end surface of the first supporting strip 1211 far away from one end of the first fixing piece 11 respectively extend outwards in an arc shape to form a first arc-shaped strip 1213 provided with a first opening 1212. The first support bar 1211 is a rectangular bar, and has a length corresponding to the length of the first fixing piece 11 and is vertically fixed on a central axis of the first fixing piece 11 along the length direction. The two side edges of the top end of the first support bar 1211 extend along two half arcs of a circle respectively to form a hollow cylinder with a gap, the cylinder is the first arc bar 1213, and the gap is the first opening 1212. The first opening 1212 is linear and parallel to the central axis of the first arc 1213.
The second engaging portion 22 includes a second engaging bar 221. The second clamping strip 221 comprises a second supporting strip 2211 vertically connected to the second fixing piece 21, and two side edges of the end surface of the second supporting strip 2211 far away from one end of the second fixing piece 21 extend outwards to form second arc-shaped strips 2213 provided with second openings 2212. The second support bar 2211 is in a rectangular bar shape, and has a length identical to that of the second fixing piece 21 and is vertically fixed on a central axis of the second fixing piece 21 along the length direction. The two side edges of the top end of the second support bar 2211 extend along two half arcs of a circle respectively to form a hollow cylinder with a gap, the cylinder is the second arc bar 2213, and the gap is the second opening 2212. The second opening 2212 is in a linear shape and is parallel to the central axis of the second arc-shaped strip 2213.
Wherein, the cross section of the first arc-shaped strip 1213 and the second arc-shaped strip 2213 are circular. Specifically, the first and second arcuate strips 1213 and 2213 have a circular shape with a certain thickness. It can be appreciated that in this cross-sectional configuration, the circular shape of the first arcuate strips 1213 and the second arcuate strips 2213 present corresponding indentations due to the presence of the first opening 1212 and the second opening 2212.
Further, the first opening 1212 is disposed at an end of the first arc-shaped bar 1213 remote from the first support bar 1211. The second opening 2212 is disposed at an end of the second arc-shaped strip 2213 away from the second support strip 2211. The inner walls of both sides of the first opening 1212 and the second opening 2212 have flared structures.
Further, the lengths of the first clamping strip 121, the first supporting strip 1211, the second clamping strip 221 and the second supporting strip 2211 are consistent with the lengths of the battery cell groups 1 along the extending direction of the cross section of the first clamping strip 121, so as to improve the stability of connection between the adjacent battery cell groups 1 and ensure the stress balance during connection.
In an embodiment of the present invention, the second arcuate strip 2213 snaps into the first arcuate strip 1213 through the first opening 1212 such that the outer surface of the second arcuate strip 2213 is in interference abutment with the inner surface of the first arcuate strip 1213. It can be appreciated that the distance of the first opening 1212 is slightly smaller than the diameter of the second arcuate strip 2213, and the outer diameter of the second arcuate strip 2213 is equal to or slightly larger than the inner diameter of the first arcuate strip 1213. The second arc-shaped strip 2213 can be clamped into the first arc-shaped strip 1213 by pressing the first opening 1212 outwards, and at this time, the second opening 2212 correspondingly contracts inwards to temporarily reduce the diameter of the second arc-shaped strip 2213, so that the second arc-shaped strip 2213 can be smoothly clamped into the first arc-shaped strip 1213. The first opening 1212 is contracted and the second opening 2212 is restored, so that the second arc-shaped strip 2213 is clamped in the first arc-shaped strip 1213 to form interference abutting joint, and further the first arc-shaped strip 1213 and the second arc-shaped strip 2213 are fully abutted, and the contact area of the first arc-shaped strip 1213 and the second arc-shaped strip 2213 is the excircle part of the whole second arc-shaped strip 2213. Compared with the traditional bus plate connecting structure, the technical scheme of the invention improves the connecting area between the adjacent cell groups 1, thereby correspondingly increasing the overcurrent capacity.
Wherein the widths of the first and second support strips 1211 and 2211 may be adaptively increased, for example, the width may be larger than the inner diameter of the second arc-shaped strip 2213. In addition, the first connecting piece 10 and the second connecting piece 20 are both in a sheet structure, so that the heat dissipation performance between the battery cell groups 1 can be improved.
In some embodiments, as shown in fig. 3-6, the first engaging portion 12 includes at least one first engaging strip 121 and at least one second engaging strip 221; the second engaging portion 22 includes at least one second engaging strip 221 corresponding to the first engaging strips 121 of the first engaging portion 12 one by one, and at least one first engaging strip 121 corresponding to the second engaging strips 221 of the first engaging portion 12 one by one. That is, the first engaging portion 12 may include the first engaging strip 121, or may include the second engaging strip 221, and the corresponding second engaging portion 22 includes the second engaging strip 221 and the first engaging strip 121 corresponding thereto. In this embodiment, the first engaging portion 12 includes a first clamping strip 121 and a second clamping strip 221, and the second engaging portion 22 also includes a second clamping strip 221 and a first clamping strip 121, so that the first engaging portion 12 and the second engaging portion 22 are engaged with each other to improve the connection strength of the two battery cell groups 1, and further improve the electrical connection area of the two battery cell groups 1.
In summary, according to the battery module connecting structure 100 provided by the invention, the first connecting piece 10 and the second connecting piece 20 are arranged at two ends of the battery cell group 1, when the battery cell groups 1 are connected in series, the first connecting piece 10 of one battery cell group 1 and the second connecting piece 20 of the other battery cell group 1 are fixed to form surface contact connection, so that the connection area of the two battery cell groups 1 is increased, and compared with the traditional point contact mode, larger current can be borne, the current bearing capacity of the whole battery module is improved, and the development requirement of new energy products on large current is favorably met.
The present invention is not limited to the details and embodiments described herein, and thus additional advantages and modifications may readily be made by those skilled in the art, without departing from the spirit and scope of the general concepts defined in the claims and the equivalents thereof, and the invention is not limited to the specific details, representative apparatus and illustrative examples shown and described herein.
Claims (8)
1. The battery module connecting structure is characterized by comprising a plurality of battery cell groups; the battery cell group comprises a plurality of single battery cells; the electrodes at two ends of the battery cell group are respectively and electrically connected with a first connecting sheet and a second connecting sheet; when at least two cell groups are connected in series, the first connecting sheets and the second connecting sheets of the adjacent cell groups are mutually fixed and form surface contact connection; the first connecting piece comprises a first fixing piece and a first clamping part which is arranged on one side of the first fixing piece far away from the corresponding connection cell group; the second connecting piece comprises a second fixing piece and a second clamping part which is arranged on one side of the second fixing piece far away from the corresponding connection cell group; the second clamping part is clamped with the first clamping part to form surface contact connection; the electrodes at two ends of the battery cell group are coaxially fixed with threaded columns, and the first connecting sheet and the second connecting sheet are fixed on the corresponding threaded columns through nuts.
2. The battery module connecting structure according to claim 1, wherein the first engaging portion comprises a first engaging strip, the first engaging strip comprises a first supporting strip vertically connected to the first fixing piece, and edges of two sides of an end surface of the first supporting strip far away from one end of the first fixing piece respectively extend outwards in an arc shape to form a first arc-shaped strip provided with a first opening; the second clamping part comprises a second clamping strip, the second clamping strip comprises a second supporting strip vertically connected to the second fixing piece, and the edges of two sides of the end face of one end of the second supporting strip, far away from the second fixing piece, extend outwards to form second arc-shaped strips with second openings respectively; the second arc-shaped strip is clamped into the first arc-shaped strip through the first opening, so that the outer surface of the second arc-shaped strip is in interference butt joint with the inner surface of the first arc-shaped strip.
3. The battery module connection structure according to claim 2, wherein the first arc-shaped bar and the second arc-shaped bar are circular in cross section.
4. The battery module connection structure according to claim 2, wherein the first opening is opened at one end of the first arc-shaped bar away from the first support bar; the second opening is formed in one end, far away from the second supporting bar, of the second arc-shaped bar.
5. The battery module connecting structure according to claim 2, wherein the first engaging portion includes at least one of the first and second engaging strips; the second clamping portion comprises at least one second clamping strip which corresponds to the first clamping strips of the first clamping portion one by one, and at least one first clamping strip which corresponds to the second clamping strips of the first clamping portion one by one.
6. The battery module connecting structure according to claim 2, wherein lengths of the first clamping bar, the first supporting bar, the second clamping bar and the second supporting bar are identical to lengths of the battery cell group along the extending direction of the cross section of the first clamping bar.
7. The battery module connection structure of claim 1, wherein both ends of the first fixing piece and the second fixing piece are connected through a pair of limiting pieces, respectively.
8. The battery module connection structure according to any one of claims 1 to 7, wherein the first connection tab and the second connection tab are both aluminum sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211190383.4A CN115513606B (en) | 2022-09-28 | 2022-09-28 | Battery module connecting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211190383.4A CN115513606B (en) | 2022-09-28 | 2022-09-28 | Battery module connecting structure |
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| Publication Number | Publication Date |
|---|---|
| CN115513606A CN115513606A (en) | 2022-12-23 |
| CN115513606B true CN115513606B (en) | 2024-04-05 |
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| CN202211190383.4A Active CN115513606B (en) | 2022-09-28 | 2022-09-28 | Battery module connecting structure |
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