CN216671800U - Cylindrical battery module - Google Patents
Cylindrical battery module Download PDFInfo
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- CN216671800U CN216671800U CN202122983861.4U CN202122983861U CN216671800U CN 216671800 U CN216671800 U CN 216671800U CN 202122983861 U CN202122983861 U CN 202122983861U CN 216671800 U CN216671800 U CN 216671800U
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- 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
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Abstract
The utility model provides a cylindrical battery module. The cylinder battery module includes: the battery core assembly comprises a plurality of groups of cylindrical battery cores; the bus bar assembly is arranged on the positive electrode side of the cell assembly and comprises a plurality of groups of first bus bars, second bus bars and third bus bars, and each group of first bus bars is connected with two adjacent groups of cylindrical cells in series; the second bus bar and the third bus bar are respectively positioned on two sides of the plurality of groups of first bus bars, the second bus bars are connected with the anodes of one group of cylindrical battery cells, and the third bus bars are connected with the cathodes of the other group of cylindrical battery cells; at least part of the pouring sealant is positioned between the two adjacent groups of cylindrical battery cells, and at least part of the pouring sealant is arranged on one side of the busbar assembly, which is far away from the battery cell assembly; and/or at least part of the pouring sealant is arranged on one side of the electric core assembly far away from the bus bar assembly. The utility model effectively solves the problems of complex structure and high cost of the cylindrical battery module in the prior art.
Description
Technical Field
The utility model relates to the technical field of battery modules, in particular to a cylindrical battery module.
Background
At present, as the grouping cost of lithium batteries tends to make and the technology maturity evolves, the diameter of a cylindrical battery core is changed from a small diameter to a large diameter, and the capacity is also changed from a small diameter to a large diameter, for example, a small capacity 18650 battery core and a 21700 battery core are changed to a 46800 battery core and a 46950 battery core. The transition is not only the increase of the diameter and the capacity (the capacity of a single cell is enlarged by nearly 10 times), but also the charge-discharge rate and the power characteristics are greatly increased.
However, the grouping structure of the cylindrical cells in the prior art is more complicated than the grouping structure of other types of packaged cells (such as square or soft package batteries), which results in higher cost for cell grouping.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a cylindrical battery module to solve the problems that the structure of the cylindrical battery module is complex and the cost is high in the prior art.
In order to achieve the above object, the present invention provides a cylindrical battery module including: the battery core assembly comprises a plurality of groups of cylindrical battery cores; the bus bar assembly is arranged on the positive electrode side of the cell assembly and comprises a plurality of groups of first bus bars, second bus bars and third bus bars, and each group of first bus bars is connected with two adjacent groups of cylindrical cells in series; the second busbar and the third busbar are respectively positioned at two sides of the plurality of first busbars, the second busbar is connected with the anodes of a group of cylindrical battery cells, and the third busbar is connected with the cathodes of a group of cylindrical battery cells; at least part of the pouring sealant is positioned between the two adjacent groups of cylindrical battery cells, and at least part of the pouring sealant is arranged on one side of the busbar assembly, which is far away from the battery cell assembly; and/or at least part of the pouring sealant is arranged on one side of the electric core assembly far away from the bus bar assembly.
Further, a plurality of groups of cylindrical battery cells are arranged along the second edgeSet direction S2Arranged, each group of cylindrical cells comprises a plurality of first preset directions S1The electric core of arranging, each group's first busbar includes: the busbar body comprises a first row body and a second row body which are mutually connected, the first row body is electrically connected with the positive electrodes of the battery cells of one group of cylindrical battery cells, and the second row body is electrically connected with the negative electrodes of the battery cells of the other group of cylindrical battery cells; the bus bar bodies are multiple and are along a first preset direction S1Arranged at intervals, in a first predetermined direction S1And a second predetermined direction S2Are arranged at an included angle; a plurality of connecting portions each for connecting two adjacent bus bar bodies; wherein, the width m of the first row body is consistent with the width m of the second row body, and the following relation is satisfied between the width m and the minimum width n of the connecting part: m is more than or equal to 3n and less than or equal to 20 n.
Further, the negative electrode is disposed around the positive electrode; the cylinder battery module still includes: the insulating structure is provided with a first avoiding part and a second avoiding part, the first avoiding part is used for avoiding the positive electrode, and at least part of the first row body of the first busbar group is arranged in the first avoiding part and is electrically connected with the positive electrode; the second avoidance part is used for avoiding at least part of the negative electrode, and at least part of the second row body of the other group of the first bus bars is arranged in the second avoidance part and is electrically connected with the negative electrode.
Furthermore, the number of the insulation structures is multiple, and the multiple insulation structures and the multiple battery cells are arranged in one-to-one correspondence; and/or the insulation structure is a PI film, or highland barley paper, or an epoxy board.
Further, first dodge the portion for the through-hole, insulating structure includes: a plate-shaped body having a through hole and a first opening, the first opening communicating with the through hole; the annular plate is arranged on the plate-shaped body, a mounting cavity is formed between the annular plate and the plate-shaped body in a surrounding mode, and one end of the battery cell is arranged in the mounting cavity; the annular plate has a second opening that communicates with the first opening, and the first opening and the second opening form a second relief portion.
Further, connecting portion include a plurality of bar plate sections that connect gradually, and the extending direction of at least one bar plate section is the camber line, and the extending direction of at least one bar plate section is the straight line shape.
Furthermore, the connecting part comprises a first plate section, a second plate section and a third plate section which are connected in sequence, the width of the second plate section is the minimum width n, and the width of the second plate section is smaller than or equal to that of the first plate section; and/or the width of the second plate section is less than or equal to the width of the third plate section.
Further, the width of the first plate section is consistent along the direction from the first plate section to the third plate section; and/or the third plate section has a uniform width.
Further, in the direction from the first plate section to the third plate section, the width of the first plate section is gradually reduced, and the width of the third plate section is gradually increased.
Furthermore, each connecting part is provided with a narrow fuse structure, and when the current flowing through the connecting part is larger than a preset current value, the narrow fuse structure generates heat to fuse the connecting part.
By applying the technical scheme of the utility model, each group of first bus bars is used for connecting two adjacent groups of cylindrical battery cells in series, the second bus bars are connected with the anodes of one group of cylindrical battery cells, and the third bus bars are connected with the cathodes of one group of cylindrical battery cells. The bus bar assembly is arranged on the positive electrode side of the electric core assembly, at least part of the pouring sealant is positioned between the two adjacent groups of cylindrical electric cores, and at least part of the pouring sealant is arranged on one side of the bus bar assembly, which is far away from the electric core assembly; and/or at least part of the pouring sealant is arranged on one side, away from the bus bar assembly, of the electric core assembly so as to encapsulate the electric core assembly and the bus bar assembly through the pouring sealant. Like this, the cylinder battery module is accomplished the assembly back by busbar subassembly and electric core subassembly and is made through the encapsulation of casting glue to make the structure of cylinder battery module simpler, easy to process, and then solved the comparatively complicated and higher problem of cost of structure of cylinder battery module among the prior art, reduced the processing cost of cylinder battery module.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic perspective view illustrating a first embodiment of a cylindrical battery module according to the present invention;
fig. 2 illustrates an exploded view of the cylindrical battery module of fig. 1;
fig. 3 is a schematic perspective view illustrating the cylindrical battery module shown in fig. 1 after the potting adhesive is removed;
fig. 4 is an enlarged schematic view of the cylindrical battery module of fig. 3 at a;
fig. 5 illustrates a top view of a bus bar assembly of the cylindrical battery module of fig. 2;
fig. 6 is a schematic perspective view illustrating an assembled insulation structure and battery cells of the cylindrical battery module in fig. 2;
FIG. 7 shows a schematic perspective view of the insulation structure of FIG. 6;
fig. 8 is a partial structural view illustrating a first bus bar of the cylindrical battery module of fig. 2;
fig. 9 is a partial structural view illustrating a first bus bar of a second embodiment of a cylindrical battery module according to the present invention; and
fig. 10 is a partial structural view illustrating a first bus bar of a third embodiment of a cylindrical battery module according to the present invention.
Wherein the figures include the following reference numerals:
10. a first bus bar; 11. a bus bar body; 111. a first row body; 112. a second row of bodies; 12. a connecting portion; 121. a strip-shaped plate section; 122. a first plate section; 123. a second plate section; 124. a third plate section; 20. an electrical core assembly; 21. an electric core; 211. a positive electrode; 212. a negative electrode; 30. a second bus bar; 40. a third bus bar; 50. pouring a sealant; 60. an insulating structure; 61. a first avoidance portion; 62. a second avoidance portion; 63. a plate-like body; 631. a first opening; 64. an annular plate; 641. a second opening; 65. and (7) installing a cavity.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless stated to the contrary, use of the directional terms "upper and lower" are generally directed to the orientation shown in the drawings, or to the vertical, or gravitational direction; likewise, for ease of understanding and description, "left and right" are generally directed to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.
In order to solve the problem that the structure of cylinder battery module is comparatively complicated and the cost is higher among the prior art, this application provides a cylinder battery module.
Example one
As shown in fig. 1 to 8, the cylindrical battery module includes an electric core assembly 20, a bus bar assembly, and a potting adhesive 50. The cell assembly 20 includes a plurality of cylindrical cells. The busbar assembly is arranged on the positive electrode side of the cell assembly 20, the busbar assembly comprises a plurality of groups of first busbars 10, second busbars 30 and third busbars 40, and each group of first busbars 10 are connected with two adjacent groups of cylindrical cells in series; the second busbar 30 and the third busbar 40 are respectively located at two sides of the plurality of groups of first busbars 10, the second busbar 30 is connected with the positive electrodes 211 of one group of cylindrical cells, and the third busbar 40 is connected with the negative electrodes 212 of the other group of cylindrical cells. At least part of the potting adhesive 50 is located between two adjacent sets of cylindrical cells, and at least part of the potting adhesive 50 is disposed on a side of the busbar assembly away from the cell assembly 20.
By applying the technical scheme of this embodiment, each group of the first bus bars 10 is used for connecting two adjacent groups of cylindrical battery cells in series, the second bus bars 30 are connected with the anodes 211 of one group of cylindrical battery cells, and the third bus bars 40 are connected with the cathodes 212 of one group of cylindrical battery cells. The busbar subassembly sets up on the positive pole side of electric core subassembly 20, and potting adhesive 50's at least part is located between two sets of adjacent cylinder electricity cores, and potting adhesive 50's at least part sets up in the one side that the electric core subassembly 20 was kept away from to the busbar subassembly to encapsulate electric core subassembly 20 and busbar subassembly through potting adhesive 50. Like this, the cylinder battery module is accomplished the assembly back by busbar subassembly and electric core subassembly 20 and is made through the encapsulation of casting glue 50 to make the structure of cylinder battery module simpler, easy to process, and then solved the comparatively complicated and higher problem of cost of structure of cylinder battery module among the prior art, reduced the processing cost of cylinder battery module.
In this embodiment, the potting adhesive 50 is potted between two adjacent sets of cylindrical cells and the bus bar assembly is away from one side of the cell assembly 20, so as to encapsulate the cell assembly 20 and the bus bar assembly through the potting adhesive 50, so that the cell assembly 20 is encapsulated as a cell holder, and the bus bar assembly is used as a framework of the potting adhesive 50, thereby avoiding failures (such as connection failures and corrosion failures) of the cell assembly 20.
Optionally, the potting adhesive 50 is an epoxy adhesive, a polyurethane structural adhesive, or an acrylic structural adhesive.
In other embodiments not shown in the drawings, at least part of the potting adhesive 50 is located between two adjacent sets of cylindrical cells, and at least part of the potting adhesive 50 is disposed on the side of the cell assembly 20 away from the busbar assembly. Specifically, at least part of the potting adhesive 50 is located between two adjacent sets of cylindrical battery cells, and at least part of the potting adhesive 50 is disposed on one side of the battery cell assembly 20 away from the busbar assembly, so as to encapsulate the battery cell assembly 20 and the busbar assembly through the potting adhesive 50. Like this, the cylinder battery module is accomplished the assembly back by busbar subassembly and electric core subassembly 20 and is made through the encapsulation of casting glue 50 to make the structure of cylinder battery module simpler, easy to process, and then solved the comparatively complicated and higher problem of cost of structure of cylinder battery module among the prior art, reduced the processing cost of cylinder battery module.
In other embodiments not shown in the drawings, at least part of the potting adhesive 50 is located between two adjacent sets of cylindrical cells, at least part of the potting adhesive 50 is disposed on the side of the busbar assembly away from the cell assembly 20, and at least part of the potting adhesive 50 is disposed on the side of the cell assembly 20 away from the busbar assembly. Like this, whole busbar subassembly of pouring sealant 50 embedment and electric core subassembly 20, the at least part of pouring sealant 50 is located between two sets of adjacent cylinder electricity cores, and at least part setting of pouring sealant 50 is in the one side that the busbar subassembly was kept away from electric core subassembly 20, and at least part setting of pouring sealant 50 is in the one side that the busbar subassembly 20 was kept away from the busbar subassembly to encapsulate electric core subassembly 20 and busbar subassembly through pouring sealant 50. Like this, the cylinder battery module is accomplished the assembly back by busbar subassembly and electric core subassembly 20 and is made through the encapsulation of casting glue 50 to make the structure of cylinder battery module simpler, easy to process, and then solved the comparatively complicated and higher problem of cost of structure of cylinder battery module among the prior art, reduced the processing cost of cylinder battery module.
As shown in fig. 3 and 8, the plurality of groups of cylindrical cells are along the second preset direction S2Arranged, each group of cylindrical cells comprises a plurality of first preset directions S1Each group of the first bus bars 10 includes a bus bar body 11 and a plurality of connection portions 12. The busbar body 11 includes a first row body 111 and a second row body 112 connected to each other, the first row body 111 is electrically connected to the positive electrodes 211 of the battery cells 21 of one group of cylindrical battery cells, and the second row body 112 is electrically connected to the negative electrodes 212 of the battery cells 21 of another group of cylindrical battery cells. The bus bar bodies 11 are plural, and the plural bus bar bodies 11 are along the first predetermined direction S1Arranged at intervals, in a first predetermined direction S1And a second predetermined direction S2Are arranged at an included angle, and each connecting part 12 is used for connecting two adjacent bus bars 11. Wherein, the width m of the first row 111 and the second row 112 is the same, and the following relation is satisfied between the width m and the minimum width n of the connecting portion 12: m is more than or equal to 3n and less than or equal to 20 n. Specifically, the above relationship between the width m of the first row 111 and the width n of the connection portion 12 can increase the contact area between the first row 111 and the positive electrode 211, and improves the connection strength and the connection stability between the first row 111 and the positive electrode 211, so as to ensure that the first bus bar 10 can electrically connect the cells 21 with large diameter and large capacity, and avoid the mutual separation between the first bus bar 10 and the cells 21 from affecting the effectiveness of the electrical connection between the first bus bar 10 and the two adjacent cells 21, thereby improving the electrical connection between the bus bar assembly and the cells 21And (6) connecting the effectiveness.
In the present embodiment, the first predetermined direction S1The width direction of the cylindrical battery module is the direction of the current of the cylindrical battery module. Second predetermined direction S2Along the length direction of cylinder battery module, also be the whole direction between parallelly connected of electric core of cylinder battery module busbar simultaneously.
In this embodiment, since the width m of the first row 111 is much greater than the width n of the connecting portion 12, the current-carrying cross section of the cylindrical battery module between the series connection of the battery cells 21 is much greater than the current-carrying cross section of the battery cells 21 between the parallel connection. Meanwhile, the arrangement enables the current paths among the single battery cells 21 to be solidified, so that the branch current paths of the battery cells 21 do not intersect. The second busbar 30 (total positive busbar) and the third busbar 40 (total negative busbar) are arranged in a first predetermined direction S1In addition, the bus bar assembly has a large section design, and under the condition of the same current-carrying section, the overall design thickness of the bus bar assembly in the embodiment is the thinnest, and the cost is better.
In this embodiment, the bus bar assembly is disposed on the positive electrode side of the cell assembly 20, that is, a single-side welding manner is employed between the bus bar assembly and the cell assembly 20, so as to facilitate disposing a cooling device on the negative electrode side of the cell assembly 20 or using the negative electrode side of the cell assembly 20 as an adhesion surface, thereby facilitating the grouping design of the cells ctp (cell to pack) and ctc (cell to sessions).
Optionally, the first bus bar 10 is made of 1-series aluminum, or red copper, or copper-aluminum composite material, so that the material selection of the first bus bar 10 is more flexible, different use requirements and working conditions are met, and the processing flexibility of workers is also improved.
Alternatively, the thickness of the busbar body 11 is 0.5mm or more and 2.0mm or less. In this way, the arrangement ensures that the first bus bar 10 can normally carry current, so that all the cells 21 can normally operate, and the structure of the bus bar body 11 is simpler, and the processing and the implementation are easier. Simultaneously, the miniaturized design of busbar subassembly has been realized to above-mentioned setting, and then has reduced battery module's whole occupation space.
In the present embodiment, the thickness of the busbar body 11 is 1.0 mm. The thickness of the bus bar body 11 is not limited to this, and may be adjusted according to the operating condition and the use requirement. Optionally, the thickness of the busbar body 11 is 0.8mm, or 1.2mm, or 1.5mm, or 1.6mm, or 1.8 mm.
Alternatively, each connecting portion 12 has a plate shape, and the plate thickness of the connecting portion 12 is 0.5mm or more and 2.0mm or less. Thus, the arrangement ensures that two adjacent bus bar bodies 11 can be electrically connected, so that the FPC board samples a plurality of battery cells 21, and the structure of the bus bar bodies 11 is simpler, and the bus bar bodies are easy to process and implement. Simultaneously, the miniaturized design of busbar subassembly has been realized to above-mentioned setting, and then has reduced battery module's whole occupation space.
In the present embodiment, the plate thickness of the connecting portion 12 coincides with the plate thickness of the busbar body 11.
As shown in fig. 4 and 6, the negative electrode 212 is disposed around the positive electrode 211. The cylindrical battery module further includes an insulating structure 60. The insulating structure 60 includes a first escape portion 61 and a second escape portion 62, the first escape portion 61 is used for escaping the positive electrode 211, and at least a part of the first row body 111 of the first busbar 10 is disposed in the first escape portion 61 and electrically connected to the positive electrode 211. The second escape portion 62 is used for escaping at least a part of the negative electrode 212, and at least a part of the second row body 112 of the other group of the first bus bars 10 is disposed in the second escape portion 62 and electrically connected to the negative electrode 212. In this way, the insulating structure 60 is used to isolate the positive and negative poles of the positive terminal of the cell assembly 20, and the risk of failure during welding of the first bus bar 10 and the cells 21 is reduced.
Specifically, after the insulating structure 60 and the battery cells 21 are assembled, the first row 111 of one set of the first bus bars 10 is disposed in the first relief portion 61 and electrically connected to the positive electrode 211, and the second row 112 of another set of the first bus bars 10 adjacent to the first bus bar 10 is disposed in the second relief portion 62 and electrically connected to the negative electrode 212, so as to electrically connect the first bus bars 10 and the battery cells 21. Meanwhile, the above-mentioned arrangement of the insulating structure 60 realizes insulation of the first row body 111 and the negative electrode 212, and thus realizes series connection between the plurality of battery cells 21.
Optionally, the positive electrode 211 of the battery cell 21 is cylindrical or annular, and the negative electrode 212 of the battery cell 21 is annular.
Optionally, the number of the insulating structures 60 is multiple, and the multiple insulating structures 60 are disposed in one-to-one correspondence with the multiple battery cells 21. Like this, above-mentioned setting ensures that insulation system 60 can carry out insulation treatment to whole electric cores 21, and then has promoted insulation system 60's insulating reliability, further reduces the failure risk when first busbar 10 and electric core 21 weld.
Optionally, the insulating structure 60 is a PI film, or highland barley paper, or epoxy board. Thus, the structure of the insulating structure 60 can be selected more flexibly by the arrangement, so that different use requirements and working conditions can be met.
As shown in fig. 6 and 7, the first escape portion 61 is a through hole, and the insulating structure 60 includes a plate-shaped body 63 and an annular plate 64. Wherein the plate-like body 63 has a through hole and a first opening 631, the first opening 631 communicating with the through hole. The annular plate 64 is arranged on the plate-shaped body 63 and surrounds the plate-shaped body 63 to form a mounting cavity 65, and one end of the battery cell 21 is arranged in the mounting cavity 65. The annular plate 64 has a second opening 641 communicating with the first opening 631, and the first opening 631 and the second opening 641 form a second escape 62. Thus, the structure of the insulating structure 60 is simpler due to the arrangement, and the processing cost of the insulating structure 60 is reduced.
Specifically, be the contained angle setting between annular plate 64 and the plate body 63, annular plate 64 sets up on the face of plate body 63 to and plate body 63 between around forming installation cavity 65, and then make insulating structure 60 be the lid structure, and then make the dismouting of insulating structure 60 and electric core 21 easier, simple and convenient, reduced the dismouting degree of difficulty.
As shown in fig. 8, the connecting portion 12 includes a plurality of strip-shaped plate segments 121 connected in sequence, at least one strip-shaped plate segment 121 extends in an arc shape, and at least one strip-shaped plate segment 121 extends in a straight shape. The strip-shaped plate segments 121 have the same width, and are all the width n.
In the present embodiment, each connecting portion 12 is provided with a narrow fuse structure, and when the current flowing through the connecting portion 12 is greater than a predetermined current value, the narrow fuse structure generates heat to fuse the connecting portion 12. Thus, if a single battery cell 21 fails due to leakage or overdischarge of a certain battery cell 21 or other abnormal factors, the battery cell 21 is reversely charged to cause overload equalization, and the connecting portion 12 is fused to avoid causing a secondary disaster or thermal runaway.
Specifically, be the contained angle setting between the extending direction of narrow position fuse structure and each connecting portion 12 to ensure that the narrow position fuse structure can fuse connecting portion 12, promoted the fusing reliability of narrow position fuse structure.
In the present embodiment, the first bus bar 10 is an integrally formed structure. Like this, above-mentioned setting has not only promoted the structural strength of first busbar 10, has prolonged the life of first busbar 10, also makes the processing of first busbar 10 easier, simple and convenient, has reduced the processing cost and the processing degree of difficulty of busbar subassembly.
In the present embodiment, the plate thickness of the connecting portion 12 coincides with that of the busbar body 11.
In the present embodiment, along the second preset direction S2One side of the cell assembly 20 is provided with a sampling area for voltage sampling of the cells 21.
Optionally, the thickness of the potting adhesive 50 is greater than or equal to 5mm and less than or equal to 20 mm.
Example two
The difference between the cylindrical battery module in the second embodiment and the cylindrical battery module in the first embodiment is that: the structure of the connecting portion 12 is different.
As shown in fig. 9, the connecting portion 12 includes a first plate section 122, a second plate section 123 and a third plate section 124 connected in sequence, the width of the second plate section 123 is the minimum width n, and the width of the second plate section 123 is smaller than or equal to the width of the first plate section 122; and/or the width of the second plate segment 123 is less than or equal to the width of the third plate segment 124. Like this, above-mentioned setting makes the structure of connecting portion 12 select more in a flexible way to satisfy different user demand and operating mode, also promoted staff's processing flexibility.
In this embodiment, the widths of the first plate section 122 and the third plate section 124 are the same, and the width of the second plate section 123 is smaller than the width of the first plate section 122, so that a narrow diameter is formed at the second plate section 123, and the current-carrying cross section between the battery cells 21 in series in the cylindrical battery module is far larger than the current-carrying cross section between the battery cells 21 in parallel.
Optionally, the extending direction of the first plate section 122 is arc-shaped.
Optionally, the third plate segment 124 extends in an arc.
Optionally, the width of the first plate segment 122 is uniform in the direction from the first plate segment 122 to the third plate segment 124; and/or the third plate segment 124 may have a uniform width. Thus, the minimum width n of the connection portion 12 is the width of the second plate section 123.
EXAMPLE III
The difference between the cylindrical battery module in the third embodiment and the cylindrical battery module in the second embodiment is that: the structure of the connecting portion 12 is different.
As shown in fig. 10, in a direction from the first plate section 122 to the third plate section 124, the width of the first plate section 122 gradually decreases, and the width of the third plate section 124 gradually increases. Thus, the arrangement of the first plate section 122 and the third plate section 124 is more flexible, so that different use requirements and working conditions are met, and the processing flexibility of workers is improved.
In the present embodiment, the width of the second plate segment 123 is the minimum width n, the minimum width of the first plate segment 122 is the same as the width of the second plate segment 123, and the minimum width of the third plate segment 124 is the same as the width of the second plate segment 123.
Optionally, the connecting portion 12 further includes a plurality of transition connecting portions, the first plate 122 is connected to the busbar body 11 through one transition connecting portion, the third plate 124 is connected to the busbar body 11 through one transition connecting portion, the transition connecting portion has a function hole, and the function hole is located between adjacent electric cores 21 for positioning and glue injection.
Optionally, the functional holes are through holes.
Optionally, the functional holes are circular or polygonal.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
each group of first busbars is used for connecting two groups of adjacent cylindrical battery cores in series, the second busbars are connected with the positive pole of a group of cylindrical battery cores, and the third busbars are connected with the negative pole of a group of cylindrical battery cores. The bus bar assembly is arranged on the positive electrode side of the electric core assembly, at least part of the pouring sealant is positioned between the two adjacent groups of cylindrical electric cores, and at least part of the pouring sealant is arranged on one side of the bus bar assembly, which is far away from the electric core assembly; and/or at least part of the pouring sealant is arranged on one side, away from the bus bar assembly, of the electric core assembly so as to encapsulate the electric core assembly and the bus bar assembly through the pouring sealant. Like this, the cylinder battery module is accomplished the assembly back by busbar subassembly and electric core subassembly and is made through the encapsulation of casting glue to make the structure of cylinder battery module simpler, easy to process, and then solved the comparatively complicated and higher problem of cost of structure of cylinder battery module among the prior art, reduced the processing cost of cylinder battery module.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cylindrical battery module, comprising:
the battery core assembly (20) comprises a plurality of groups of cylindrical battery cores;
the bus bar assembly is arranged on the positive electrode side of the electric core assembly (20), and comprises a plurality of groups of first bus bars (10), second bus bars (30) and third bus bars (40), wherein each group of first bus bars (10) is connected with two adjacent groups of cylindrical electric cores in series; the second busbar (30) and the third busbar (40) are respectively located on two sides of the multiple groups of first busbars (10), the second busbar (30) is connected with the positive electrodes (211) of one group of cylindrical battery cells, and the third busbar (40) is connected with the negative electrodes (212) of the other group of cylindrical battery cells;
the pouring sealant (50) is at least partially positioned between two adjacent groups of cylindrical battery cores, and at least part of the pouring sealant (50) is arranged on one side, away from the battery core assembly (20), of the busbar assembly; and/or at least part of the pouring sealant (50) is arranged on one side of the electric core assembly (20) far away from the bus bar assembly.
2. The cylindrical battery module according to claim 1, wherein the plurality of groups of cylindrical cells are arranged along a second preset direction S2Arranged, each group of cylindrical cells comprises a plurality of first preset directions S1Arranged electric cells (21), each set of the first busbar (10) comprising:
the busbar body (11) comprises a first busbar body (111) and a second busbar body (112) which are connected with each other, the first busbar body (111) is electrically connected with a positive electrode (211) of one group of cylindrical battery cells (21), and the second busbar body (112) is electrically connected with a negative electrode (212) of another group of cylindrical battery cells (21); the bus bar bodies (11) are multiple, and the multiple bus bar bodies (11) are arranged along the first directionSet direction S1Arranged at intervals, the first preset direction S1And the second preset direction S2Are arranged at an included angle;
a plurality of connecting portions (12), each connecting portion (12) connecting two adjacent bus bar bodies (11);
wherein the width m of the first row body (111) and the second row body (112) is consistent, and the width m and the minimum width n of the connecting part (12) satisfy the following relation: m is more than or equal to 3n and less than or equal to 20 n.
3. The cylindrical battery module according to claim 2, wherein the negative electrode (212) is disposed around the positive electrode (211); the cylindrical battery module further comprises:
an insulating structure (60) having a first escape portion (61) and a second escape portion (62), the first escape portion (61) being for escaping the positive electrode (211), at least a part of the first row body (111) of a set of first busbars (10) being arranged in the first escape portion (61) and being electrically connected to the positive electrode (211); the second avoiding part (62) is used for avoiding at least part of the negative pole (212), and at least part of the second row body (112) of the other group of first bus bars (10) is arranged in the second avoiding part (62) and is electrically connected with the negative pole (212).
4. The cylindrical battery module according to claim 3, wherein the number of the insulating structures (60) is multiple, and the multiple insulating structures (60) are arranged in one-to-one correspondence with the multiple battery cells (21); and/or the insulation structure (60) is a PI film, or highland barley paper, or an epoxy board.
5. The cylindrical battery module according to claim 3, wherein the first relief portion (61) is a through hole, and the insulating structure (60) comprises:
a plate-like body (63) having the through hole and a first opening (631), the first opening (631) communicating with the through hole;
the annular plate (64) is arranged on the plate-shaped body (63) and surrounds and forms a mounting cavity (65) with the plate-shaped body (63), and one end of the battery cell (21) is arranged in the mounting cavity (65); the annular plate (64) has a second opening (641) communicating with the first opening (631), and the first opening (631) and the second opening (641) form the second escape portion (62).
6. The cylindrical battery module according to claim 2, wherein the connecting portion (12) comprises a plurality of strip-shaped plate segments (121) connected in sequence, the extending direction of at least one strip-shaped plate segment (121) is arc-shaped, and the extending direction of at least one strip-shaped plate segment (121) is linear.
7. The cylindrical battery module according to claim 2, wherein the connecting part (12) comprises a first plate section (122), a second plate section (123) and a third plate section (124) which are connected in sequence, the width of the second plate section (123) is the minimum width n, and the width of the second plate section (123) is less than or equal to the width of the first plate section (122); and/or the width of the second plate section (123) is less than or equal to the width of the third plate section (124).
8. The cylindrical battery module according to claim 7, wherein the first plate section (122) has a uniform width in the direction from the first plate section (122) to the third plate section (124); and/or the third plate section (124) has a uniform width.
9. The cylindrical battery module according to claim 7, wherein the width of the first plate segment (122) is gradually reduced and the width of the third plate segment (124) is gradually increased in a direction from the first plate segment (122) to the third plate segment (124).
10. The cylindrical battery module according to claim 2, wherein each of the connecting portions (12) is provided with a slit fuse structure, and the slit fuse structure generates heat to fuse the connecting portion (12) when a current flowing through the connecting portion (12) is greater than a preset current value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122983861.4U CN216671800U (en) | 2021-11-30 | 2021-11-30 | Cylindrical battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122983861.4U CN216671800U (en) | 2021-11-30 | 2021-11-30 | Cylindrical battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216671800U true CN216671800U (en) | 2022-06-03 |
Family
ID=81791243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122983861.4U Active CN216671800U (en) | 2021-11-30 | 2021-11-30 | Cylindrical battery module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216671800U (en) |
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2021
- 2021-11-30 CN CN202122983861.4U patent/CN216671800U/en active Active
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