CN218731644U - Busbar structure and battery module - Google Patents

Abstract

The utility model provides a busbar structure and battery module for electric core group, electric core group includes a plurality of monomer electric cores of arranging along self thickness direction, the busbar subassembly includes the busbar, be provided with the locating hole on the busbar, be provided with on the utmost point post of monomer electric core with locating hole clearance fit's reference column, the busbar welding is in between the utmost point post of monomer electric core, the electricity is connected monomer electric core. This embodiment passes through the fit clearance that sets up between reference column and locating hole, can make the reference column on the monomer electricity core utmost point post keep being connected with the locating hole all the time to confirm the welding position of monomer electricity core utmost point post and busbar according to the reference column in the position of locating hole, compensate the busbar that monomer electricity core caused because of thickness tolerance and utmost point post skew problem, guarantee busbar and utmost point post welding position's accuracy, avoid busbar and monomer electricity core utmost point post welding to appear badly.

Description

Busbar structure and battery module

Technical Field

The utility model relates to a battery technology field especially relates to a busbar structure and battery module.

Background

The battery module is arranged by a plurality of electric cores and constitutes, utilizes the busbar to connect in order to realize electrically conductive connection between electric core and the electric core, and the busbar is usually welded with the utmost point post of electric core with the busbar with being connected of electric core.

Because electric core thickness is not identical when a plurality of electric cores are assembled together, when first busbar is aimed at to electric core utmost point post, can cause subsequent busbar and electric core utmost point post can't align because of the accumulation of tolerance to cause the welding badly, arouse the rosin joint, reduce the assembly quality of battery module.

Chinese patent publication No. CN106784563A discloses a lithium battery module busbar connection structure, which is characterized in that a plurality of embedding grooves with the same size are hollowed in a busbar mounting plate, a busbar is arranged below the busbar mounting plate, the busbar is composed of a metal connecting sheet and a metal connecting head, the metal connecting sheet is embedded in the embedding groove of the busbar mounting plate, and the metal connecting head extends downwards to the embedding groove and is welded with a battery cell pole. Although this scheme can realize and electric core utmost point post welding through the metallic interconnect head on the busbar, but only can guarantee busbar and electric core utmost point post welding quality in the direction of height, under the condition that there is tolerance accumulation in electric core thickness direction, the metallic interconnect head on the busbar exists with electric core utmost point post welding position skew problem in the horizontal direction to lead to busbar and electric core utmost point post to have rosin joint or weld bad problem.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a bus bar structure and battery module solves at present stage because of electric core thickness tolerance leads to current bus bar structure and electric core utmost point post welding process, and there is the offset in weld position bus bar and electric core utmost point post, causes bus bar and the bad problem of electric core utmost point post welding.

The technical scheme of the utility model is realized like this:

in one aspect, the utility model provides a busbar structure for electric core group, electric core group includes a plurality of monomer electricity cores of arranging along self thickness direction, the busbar structure includes the busbar, be provided with the locating hole on the busbar, be provided with on the utmost point post of monomer electricity core with locating hole clearance fit's reference column, the busbar welding is in between the utmost point post of monomer electricity core, the electricity is connected monomer electricity core.

On the basis of the technical scheme, the busbar structure further comprises an electric isolation plate arranged above the electric core group and used for supporting and fixing the busbar, a welding position is arranged on the electric isolation plate, and a pole of the monomer electric core extends out of the welding position and is connected with a positioning hole in the busbar.

For some embodiments, the inner diameter of the locating hole is larger than the outer diameter of the locating post.

As another embodiment, the positioning holes are strip-shaped holes, and the length direction of the strip-shaped holes faces the thickness direction of the single battery cells.

On the basis of the technical scheme, preferably, the welding position comprises a through hole and an installation groove, the pole of the single battery cell extends out of the through hole, and the bus bar is horizontally arranged on the installation groove.

Further, it is preferred, the mounting groove is followed be provided with the buckle on two inside walls of monomer electricity core thickness direction respectively, the busbar with the one end that the utmost point post of monomer electricity core is connected with the buckle joint.

Further, preferably, the mounting groove is in clearance fit with the busbar in the horizontal direction.

Preferably, the middle part of the busbar connected with the two adjacent monomer battery cores is provided with a protruding part, and the mounting groove is internally provided with a supporting part which is propped against the bottom surface of the protruding part.

On the other hand, the utility model provides a battery module, battery module include the electric core group with the busbar structure, the busbar structure sets up at electric core group top surface, the busbar with monomer electricity core utmost point post links to each other in order to realize a plurality ofly series-parallel connection between the monomer electricity core.

On the basis of the above technical scheme, preferably, the battery cell group further includes a cushion pad disposed between the single battery cells.

The utility model discloses for prior art following beneficial effect has:

(1) The utility model discloses a busbar structure, through set up the reference column on the utmost point post of monomer electricity core, and set up on the busbar with reference column clearance fit's reference column, carry out prepositioning with the locating hole on the busbar with the reference column on the monomer electricity core first during the assembly, when monomer electricity core thickness has the tolerance, through the fit clearance that sets up between reference column and locating hole, can make the reference column on the utmost point post of monomer electricity core keep being connected with the locating hole all the time, thereby confirm the welding position of monomer electricity core utmost point post and busbar according to the position of reference column at the locating hole, compensate the busbar and utmost point post skew problem that monomer electricity core caused because of thickness tolerance, guarantee the accuracy of busbar and utmost point post welding position, avoid busbar and monomer electricity core utmost point post welding to appear badly;

(2) By arranging the electrical isolation plate, on one hand, the single-cell pole can be positioned, and on the other hand, the busbar can be positioned in different directions, so that the welding quality of the busbar and the single-cell pole in different directions is ensured;

(3) The clamping buckle clamped with the bus bar is arranged on the inner side wall of the mounting groove, so that the bus bar can be limited in the mounting groove in the height direction, the connection reliability of the bus bar and the pole in the height direction is ensured, and the welding quality is improved;

(4) Through the clearance fit of the mounting groove and the busbar in the horizontal direction, a certain clearance can be reserved between the busbar and the mounting groove in the thickness direction of the single battery cell, so that even if the thicknesses of the single battery cells are different, the reserved clearance can be used for compensating for thickness tolerance, and poor welding caused by the deviation of the welding positions of the busbar and the single battery cell pole is avoided;

(5) Set up the bellying through the busbar middle part, set up in the mounting groove and support the supporting part of holding with the bellying bottom surface, can make the both ends of busbar and utmost point post surface closely laminate, improve busbar and utmost point post welding reliability.

(6) Through design blotter between two adjacent monomer electricity cores, when monomer electricity core thickness took place the deviation, the error of thickness can be absorbed to the blotter.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a three-dimensional assembly structure of a busbar structure and a cell group disclosed in the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

fig. 3 is a schematic perspective view of a bus bar of the present invention;

fig. 4 is a schematic view of a plane assembly structure of the busbar structure and the electric core assembly disclosed by the present invention;

FIG. 5 is a plan sectional view taken at B-B in FIG. 4;

FIG. 6 is an enlarged view of a portion of FIG. 4 at C;

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

reference numerals:

1. the electric core group; 11. a single cell; 110. a pole column; 2. a bus structure; 21. a bus bar; 211. positioning holes; 1101. a positioning column; 22. an electrical isolation plate; 221. a through hole; 222. mounting grooves; 2221. buckling; 212. a boss portion; 2222. a support portion; 12. a cushion pad.

Detailed Description

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

As shown in fig. 1, with reference to fig. 2-3, an embodiment of the present invention discloses a busbar 21 assembly 2 for an electric core assembly 1, the electric core assembly 1 includes a plurality of monomer electric cores 11 arranged along the thickness direction of the electric core assembly, the monomer electric core 11 disclosed in this embodiment is a square electric core, and the pole 110 of the monomer electric core 11 is located the highly square top end of the monomer electric core 11.

The busbar arrangement 2 includes a plurality of busbars 21, and the busbars 21 are provided to electrically connect the unit cells 11 to the unit cells 11.

In the prior art, because monomer electric core 11 thickness is not identical when a plurality of monomer electric cores 11 assemble together, when first busbar 21 was aimed at to the utmost point post 110 of monomer electric core 11, because the accumulation of tolerance can cause subsequent busbar 21 and the unable alignment of electric core utmost point post 110 to cause the welding badly, arouse the rosin joint, reduce the assembly quality of battery module.

For this reason, the present embodiment structurally improves the existing bus bar 21 to solve the above-described problems.

Specifically, the bus bar 21 of the present embodiment is provided with a positioning hole 211, and the pole 110 of the single battery cell 11 is provided with a positioning post 1101 in clearance fit with the positioning hole 211. In this embodiment, preferably, the bus bar 21 is in a connecting sheet shape, the bus bar 21 has positioning holes 211 at two ends in the length direction respectively, and the positioning posts 1101 are vertically fixed at the centers of the electrode posts 110, so that the two ends in the length direction of the bus bar 21 are respectively sleeved on the positioning posts 1101 through the positioning holes 211, and then the bottom surface of the bus bar 21 is attached to the electrode posts 110 of the electric cells 11. After the busbar 21 and the poles 110 of the two monomer electric cores 11 are assembled, the busbar 21 is welded between the poles 110 of the monomer electric cores 11, and the monomer electric cores 11 are electrically connected.

The technical solution is adopted in this embodiment, so as to solve the technical problem, specifically, when assembling, the positioning post 1101 on the monomer electric core 11 and the positioning hole 211 on the busbar 21 are pre-positioned, when the thickness of the monomer electric core 11 has a tolerance, the positioning post 1101 on the monomer electric core 11 pole column 110 can be always kept connected with the positioning hole 211 through a fit clearance arranged between the positioning post 1101 and the positioning hole 211, so that the welding position of the monomer electric core 11 pole column 110 and the busbar 21 is determined according to the position of the positioning post 1101 at the positioning hole 211, that is, the welding area corresponding to the busbar 21 and the pole column 110 is determined within a certain diameter range by taking the positioning post 1101 as the center, welding of the busbar 21 and the pole column 110 is realized by a laser welding method, thereby making up the problem that the busbar 21 and the pole column 110 are deviated due to the thickness tolerance of the monomer electric core 11, ensuring the accuracy of the welding position of the busbar 21 and the pole column 110, and avoiding poor welding of the busbar 21 and the monomer electric core 11 pole column 110.

As some preferred embodiments, referring to fig. 1, 2, 4, 5 and 6, the bus bar structure 2 of this embodiment further includes an electrical isolation plate 22 disposed above the electric core assembly 1 for supporting the fixing bus bar 21. The electrical isolation plate 22 is made of an insulating material, and can electrically isolate the wire harness from the bus bar 21 and the unit cells 11. The electrical isolation plate 22 is provided with a welding position, and the pole column 110 of the unit cell 11 protrudes from the welding position and connects the positioning column 1101 on the pole column 110 with the positioning hole 211 on the busbar 21. By adopting the technical scheme, on one hand, the single battery cell 11 pole 110 can be positioned, on the other hand, the position of the bus bar 21 can be positioned, and the accuracy of the relative position of the bus bar 21 and the single battery cell 11 pole 110 is ensured.

As some examples, referring to fig. 3, the inner diameter of the pilot hole 211 is larger than the outer diameter of the pilot column 1101, the pilot hole 211 is not limited to any one of a circle, a square, a triangle and a polygon, the shapes of the pilot column 1101 and the pilot hole 211 are matched, and the pilot column 1101 and the pilot hole 211 are in clearance fit. Therefore, when the tolerance exists in the thickness direction of the single battery cells 11, the busbar 21 is connected with the pole 110 on the two single battery cells 11, and the positioning column 1101 and the positioning hole 211 have a fit clearance, so that the positioning column 1101 can be ensured to be inserted into the positioning hole 211 in a certain tolerance range, the welding position of the busbar 21 and the pole 110 is determined through the positioning column 1101, the position deviation caused when the busbar 21 is welded with the pole 110 can be avoided, and the welding quality is improved.

As another embodiment, the positioning holes 211 are strip-shaped holes, and the length direction of the strip-shaped holes faces the thickness direction of the cell 11. From this setting, can be when there is tolerance in monomer electric core 11 thickness direction, reference column 1101 on monomer electric core 11 utmost point post 110 can be at the downthehole translation of bar, make reference column 1101 on monomer electric core 11 utmost point post 110 keep being connected with locating hole 211 all the time, thereby confirm the welding position of monomer electric core 11 utmost point post 110 and busbar 21 according to reference column 1101 in the position of locating hole 211, compensate monomer electric core 11 because of busbar 21 and utmost point post 110 skew problem that thickness tolerance caused, guarantee busbar 21 and utmost point post 110 welding position's accuracy.

As some preferred embodiments, the welding position of the present embodiment includes a through hole 221 and a mounting groove 222, the pole 110 of the single battery cell 11 extends from the through hole 221, and the bus bar 21 is horizontally disposed on the mounting groove. Through setting up perforating hole 221, can carry out the horizontal direction spacing to utmost point post 110, thereby make electrical isolation board 2 and monomer electricity core 11 keep certain relative position in the horizontal direction, busbar 21 level sets up in mounting groove 222 simultaneously, can inject busbar 21 for busbar 21 position at height and horizontal direction through mounting groove 222, locating hole 211 on cooperation busbar 21 and the locating hole 211 on the utmost point post 110 of monomer electricity core 11, thereby can realize busbar 21 and monomer electricity core 11 positioning connection back, can accurate definite busbar 21 and monomer electricity core 11 welding position, guarantee welding position reliability, avoid rosin joint to take place.

In the above embodiment, the inner contour of the through hole 221 is matched with the outer contour of the pole 110, and the two are in clearance fit, so that after the bus bar 21 is installed in the installation groove 222, the position of the electrical isolation plate in the horizontal direction relative to the pole 110 of the single battery cell 11 can be adjusted, the welding assembly position of the bus bar 21 and the single battery cell 11 is adjusted, and further, accurate welding positioning is achieved.

In order to make the bus bar 21 and the terminal 110 of the cell 11 closely fit, a welding cold joint caused by an excessively large gap is avoided. Referring to fig. 2, 4, 5 and 6, in this embodiment, two inner side walls of the installation groove 222 along the thickness direction of the single battery cell 11 are respectively provided with a buckle 2221, and one end of the bus bar 21 connected to the pole 110 of the single battery cell 11 is clamped with the buckle 2221. Therefore, the bus bar 21 can be limited in the height direction in the mounting groove 222, the connection reliability of the bus bar 21 and the pole 110 in the height direction is guaranteed, and the welding quality is improved.

On the basis of the above technical solution, the middle of the bus bar 21 is provided with the protruding portion 212, and the mounting groove 222 is internally provided with the supporting portion 2222 abutting against the bottom surface of the protruding portion 212, so that the two ends of the bus bar 21 can be tightly attached to the surface of the pole 110, and the welding reliability of the bus bar 21 and the pole 110 is improved.

As some preferred embodiments, the mounting groove 222 and the bus bar 21 are in clearance fit in the horizontal direction, so that a certain clearance is reserved between the bus bar 21 and the mounting groove 222 in the thickness direction of the single battery cell 11, and thus even if the thicknesses of the single battery cells 11 are different, the reserved clearance can be used for compensating for a thickness tolerance, and poor welding caused by deviation of the welding position of the pole 110 of the bus bar 21 and the single battery cell 11 is avoided.

The utility model also provides a battery module, it is shown with reference to figure 7, battery module include electric core group 1 and the busbar structure 2, and busbar structure 2 sets up at electric core group 1 top surface, and busbar 21 links to each other with 11 utmost point posts 110 of monomer electricity core in order to realize the cluster parallel connection between a plurality of monomer electricity cores 11. Through the structure setting of the bus bar structure 2, the welding positions between all the bus bars 21 and the corresponding connected poles 110 of the single battery cells 11 can be accurate, and the occurrence of poor welding phenomena is avoided.

In the present embodiment, the battery pack 1 further includes a buffer pad 12 disposed between the unit battery cells 11 and the unit battery cells 11, so that when the thickness of the unit battery cells 11 deviates, the buffer pad 12 can absorb the thickness error. Preferably, the cushion 12 may be a cushion foam.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. 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 busbar structure for electric core group (1), electric core group (1) includes a plurality of monomer electric cores (11) of arranging along self thickness direction, its characterized in that: the busbar structure (2) comprises a busbar (21), a positioning hole (211) is formed in the busbar (21), a positioning column (1101) in clearance fit with the positioning hole (211) is arranged on a pole (110) of the monomer electric core (11), the busbar (21) is welded between the poles (110) of the monomer electric core (11), and the monomer electric core (11) is electrically connected.

2. The bus bar structure of claim 1, wherein: the busbar structure (2) further comprises an electric isolation plate (22) arranged above the electric core group (1) and used for supporting and fixing the busbar (21), a welding position is arranged on the electric isolation plate (22), and a pole column (110) of the single electric core (11) extends out of the welding position and enables a positioning column (1101) on the pole column (110) to be connected with a positioning hole (211) in the busbar (21).

3. The bus bar structure as set forth in claim 2, wherein: the inner diameter of the positioning hole (211) is larger than the outer diameter of the positioning column (1101).

4. The bus bar structure of claim 2, wherein: the positioning holes (211) are arranged to be strip-shaped holes, and the length direction of the strip-shaped holes faces to the thickness direction of the single battery cell (11).

5. The bus bar structure as set forth in claim 2, wherein: the welding position comprises a through hole (221) and a mounting groove (222), the pole (110) of the single battery core (11) extends out of the through hole (221), and the bus bar (21) is horizontally arranged on the mounting groove (222).

6. The bus bar structure of claim 5, wherein: the mounting groove (222) is provided with buckles (2221) along two inner side walls in the thickness direction of the single battery cell (11), and one end of the busbar (21) connected with the pole (110) of the single battery cell (11) is clamped with the buckles (2221).

7. The bus bar structure of claim 5, wherein: the mounting groove (222) is in clearance fit with the bus bar (21) in the horizontal direction.

8. The bus bar structure of claim 5, wherein: the middle of a bus bar (21) connected with two adjacent monomer battery cores (11) is provided with a protruding part (212), and a supporting part (2222) propped against the bottom surface of the protruding part (212) is arranged in the mounting groove (222).

9. A battery module, characterized in that the battery module comprises a cell group (1) and the busbar structure (2) of any one of claims 1 to 8, the busbar structure (2) is arranged on the top surface of the cell group (1), and the busbar (21) is connected with the electrode posts (110) of the single cells (11) to realize series-parallel connection among the single cells (11).

10. The battery module of claim 9, the battery pack (1) further comprising a buffer pad (12) disposed between the individual cells (11) and the individual cells (11).

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