CN205211838U - Be applied to busbar of lithium ion battery group - Google Patents

Be applied to busbar of lithium ion battery group Download PDF

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Publication number
CN205211838U
CN205211838U CN201521106052.3U CN201521106052U CN205211838U CN 205211838 U CN205211838 U CN 205211838U CN 201521106052 U CN201521106052 U CN 201521106052U CN 205211838 U CN205211838 U CN 205211838U
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CN
China
Prior art keywords
sub
connecting portion
connection portion
battery core
copper bar
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.)
Expired - Fee Related
Application number
CN201521106052.3U
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Chinese (zh)
Inventor
吴云川
李红朋
戴润义
陈柯宇
彭春晖
张�雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Yajun New Energy Automobile Technology Co Ltd
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Chengdu Yajun New Energy Automobile Technology Co Ltd
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Priority to CN201521106052.3U priority Critical patent/CN205211838U/en
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Publication of CN205211838U publication Critical patent/CN205211838U/en
Expired - Fee Related legal-status Critical Current
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The utility model discloses a be applied to busbar of lithium ion battery group. It is including the copper bar, a plurality of respectively through the parallelly connected monomer electricity core to the copper bar of sheetmetal, the sheetmetal comprises and one shot forming electric core connecting portion, intermediate junction portion and the copper bar connecting portion connected in order, and intermediate junction portion constitutes just the cross section width that the cross section width of every sub - connecting portion is less than electric core connecting portion and copper bar connecting portion by a plurality of sub - connecting portion of connecting in order. Through carrying out special structural design to the sheetmetal, reduce the cross sectional area that current path went up the sheetmetal widely, this sheetmetal is just like the fuse, as long as certain non - normal condition that monomer electricity core appears overflowing, and the electric current ability of bearing the most greatly that has surpassed this sheetmetal, the sheetmetal will break off like the fuse passively, keep apart this monomer electricity core with whole group battery current loop effectively, thereby prevent the monomer electricity core that overflows thermal runaway and chain thermal runaway reaction further to appear, reach safety protection's effect.

Description

A kind of bus-bar being applied to Li-ion batteries piles
Technical field
The utility model relates to a kind of bus-bar being applied to Li-ion batteries piles, belongs to battery field in groups.
Background technology
In recent years along with the fast development of electric automobile, more and more higher to the performance requirement of power battery pack.Li-ion batteries piles is as the power source of pure electric automobile, stroke-increasing electric automobile and mixed dynamic power vehicle, and the reliability of its Li-ion batteries piles directly affects the riding fail safe of automobile.The Li-ion batteries piles of an electric automobile needs thousands of battery core connection in series-parallel compositions, the otherness of every battery core various degrees usually.
Current bus-bar design is normally connected by laser welding process with copper bar by whole piece sheet metal, and battery core pole is connected by resistance welding technology with sheet metal.Due to current for the design of bus-bar, do not carry out current capacity analysis & verification to the sheet metal be connected with every battery core respectively, the current capacity of its sheet metal is all far beyond the short circuit current of single battery core.Also there is no FA battery management system due to current, be difficult to carry out effective monitor and managment to each battery core of internal battery pack.Therefore, when internal battery pack a certain battery core generation overcharge, overdischarge or micro-short circuit time, the sheet metal of its bus-bar can not the electrical connection of the abnormal battery core of passive disconnection and battery pack, and then cause the further thermal runaway of this abnormal battery core and whole battery pack generation chain reaction thermal runaway, thus cause electric automobile security incident.Not only can cause any property loss, also likely cause personal injury.Therefore, the safety problem of Li-ion batteries piles has become one of key factor affecting the development of lithium ion battery emerging market.
Mainly contain following 2 kinds of schemes at present and overcurrent protection is carried out to battery cell battery core: (1) realizes the overcurrent protection of monomer battery core by welding fusible link between battery pack and back flow plate; (2) overcurrent protection of monomer battery core is realized by pasting SMD ceramic paster fuse on positive pole pcb plate.High and the complex structure of these 2 kinds of scheme cost compares.
Utility model content
The purpose of this utility model is to provide a kind of bus-bar being applied to Li-ion batteries piles; mainly solve current Li-ion batteries piles bus-bar technology do not solve well when some battery core generation overcharge of internal battery pack, overdischarge or inner micro-short circuit time, Li-ion batteries piles carries out the safety problem of passive overcurrent protection to self.
To achieve these goals, the technical solution adopted in the utility model is as follows:
Be applied to a bus-bar for Li-ion batteries piles, comprise copper bar, multiple monomer battery core being connected in parallel to copper bar respectively by sheet metal; Described sheet metal is made up of and one-shot forming the battery core connecting portion connected in turn, middle interconnecting piece and copper bar connecting portion, described middle interconnecting piece is made up of multiple sub-connection portion connected in turn and the cross-sectional width in each sub-connection portion is less than the cross-sectional width of battery core connecting portion and copper bar connecting portion, and preferred sub-connection position is 3.By carrying out special structural design to sheet metal, the cross-sectional area of sheet metal on current path can be reduced widely, this sheet metal is just as fuse, replace fusible link of the prior art, and with copper bar, monomer battery core integrate, cost greatly reduces, and structure is simple, and assembling is quick.
As preferably, described middle interconnecting piece is made up of and one-shot forming the first sub-connection portion, the second sub-connection portion, the 3rd sub-connection portion, one end in the first sub-connection portion is connected with copper bar connecting portion side is vertical, one end in the second sub-connection portion is connected with the other end in the first sub-connection portion is vertical, 3rd end, sub-connection portion one is connected with second the other end, sub-connection portion is vertical, and the other end in the 3rd sub-connection portion is connected with the side of battery core connecting portion is vertical.
Save consumptive material to make sheet metal, little, the overall performance of taking up space is stable, make easily, described second sub-connection portion and copper bar connecting portion are in the first sub-connection portion homonymy, first sub-connection portion and the 3rd sub-connection portion are positioned at the second both sides, sub-connection portion, and the second sub-connection portion and battery core connecting portion are in the 3rd sub-connection portion homonymy.
Battery core connecting portion connect the 3rd connecting portion the bar-shaped trough parallel with the first connecting portion or the 3rd connecting portion is also provided with to middle side part, this bar-shaped trough is covered on monomer battery core pole.
In order to the current carrying capacity of conservative control sheet metal, the cross-sectional width value range in described each sub-connection portion is 1mm-2mm.
Compared with prior art, the utility model has following beneficial effect:
The utility model passes through the current Li-ion batteries piles bus structures of design optimization, a kind of bus-bar being applied to Li-ion batteries piles of utility model, when internal battery pack short circuit or some monomer battery core overcharge inner, overdischarge, the abnormal monomer battery core that overcurrent appears in internal battery pack effectively can be disconnected by the special construction of bus-bar, prevent abnormal monomer battery core from worsening further and thermal runaway, thus effectively stop whole battery pack to be short-circuited and the chain reaction of thermal runaway.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model-embodiment 1.
Fig. 2 is the structural representation of the utility model-embodiment 1 sheet metal.
Fig. 3 is the structural representation of the utility model-embodiment 2 sheet metal.
In above-mentioned accompanying drawing, the component names that Reference numeral is corresponding is as follows:
1-monomer battery core, 2-sheet metal, 3-copper bar, 4-battery core connecting portion, 41-bar-shaped trough, 5-middle interconnecting piece, 51-first sub-connection portion, 52-second sub-connection portion, 53-the 3rd sub-connection portion, 6-copper bar connecting portion.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, and execution mode of the present utility model includes but not limited to the following example.
Embodiment 1
As shown in Figure 1, a kind of bus-bar being applied to Li-ion batteries piles, form primarily of monomer battery core 1, sheet metal 2, copper bar 3, the pole of multiple monomer battery core 1 is connected in parallel to bronze medal composition bus-bar respectively by sheet metal 2, sheet metal 2 is connected by resistance spot welding process with monomer battery core 1, and sheet metal 2 is connected by laser welding process with copper bar 3.Sheet metal 2 is nickel sheet preferably.
In order to realize the passive disconnection of sheet metal 2 after monomer battery core 1 overcurrent; whole battery pack protection is prevented to the function of thermal runaway; in the present embodiment, the sheet metal 2 on the positive terminal of monomer battery core 1 adopts special structural design, specifically as shown in Figure 2:
Sheet metal 2 is primarily of the also one-shot forming of battery core connecting portion 4, middle interconnecting piece 5 and copper bar connecting portion 6 composition, middle interconnecting piece 5 comprises the first sub-connection portion 51 that an end is connected with copper bar connecting portion 6 side end vertical, one end and the other end in the first sub-connection portion 51 be vertical be connected and with the second sub-connection portion 52 of copper bar connecting portion 6 homonymy, the other end in one end and second the other end, sub-connection portion 52 the 3rd sub-connection portion 53 of sub-connection portion the 53, three connected vertically is connected with the side end vertical of battery core connecting portion 4.
In the present embodiment, the first sub-connection portion 51 and the 3rd sub-connection portion 53 are positioned at the second both sides, sub-connection portion 52, battery core connecting portion 4 and the second sub-connection portion 52 homonymy.And the overall width of battery core connecting portion 4, middle interconnecting piece 5 and copper bar connecting portion 6 is equal.
The middle interconnecting piece 5 of the present embodiment is best structure, if be arranged to other structures, such as, first sub-connection portion 51, second sub-connection portion 52, 3rd sub-connection portion 53 is once in line type, the structure of this kind of middle interconnecting piece 5 then can reach fusing effect equally, but, there is the bad defect of bus-bar overall structure steadiness in this kind of structure, in actual use, even if when not there is overcurrent in middle interconnecting piece 5, also be easily subject to the effect of external force and rupture, affect the normal use of battery pack, otherwise, the middle interconnecting piece 5 of the present embodiment is when being subject to external force, then be not easy to fracture, steadiness is good.
What connect the 3rd sub-connection portion 53 at battery core connecting portion 4 is also provided with the bar-shaped trough 41 parallel with the first sub-connection portion 51 or the 3rd sub-connection portion 53 to middle side part, and during assembling, this bar-shaped trough 41 is covered on monomer battery core 1 pole.The object arranging bar-shaped trough is, the width of same reduction battery core connecting portion 4 cross section, makes battery core connecting portion 4 reduce with the contact-making surface of monomer battery core 1, when there is overcurrent, accelerate the fusing of middle interconnecting piece 5, rapidly this monomer battery core and whole battery pack current loop are isolated.
In the present embodiment, monomer battery core 1 adopts 18650, overcurrent value is set to 3C-6C, in like manner, according to 32650 battery cores, overcurrent value is set to 3C-6C equally, and the cross-sectional width in the first sub-connection portion 52 of sub-connection portion 51, second, the 3rd sub-connection portion 53 is equal, and cross-sectional width value range is 1mm-2mm.
The manufacture craft of the present embodiment is comparatively simple, first sizeable rectangle sheet metal is selected, adopt the technique of stamping and blanking to carry out being processed to form middle interconnecting piece 5 and bar-shaped trough 41 at the ad-hoc location of rectangle sheet metal, the sheet metal of this structure saves consumptive material, little, the overall performance of taking up space stablizes.By carrying out special structural design to sheet metal; the cross-sectional area of sheet metal on current path can be reduced widely; this sheet metal is just as fuse; as long as there is the abnormal condition of overcurrent in certain monomer battery core; and exceeded the maximum loaded current ability of this sheet metal; sheet metal will passive disconnection as fuse; effectively this monomer battery core and whole battery pack current loop are isolated; thus stop the monomer battery core of overcurrent to occur thermal runaway and the reaction of chain thermal runaway further, reach the effect of safeguard protection.
Embodiment 2
As shown in Figure 3, a kind of bus-bar being applied to Li-ion batteries piles, the sheet metal 2 of the present embodiment is primarily of the also one-shot forming of battery core connecting portion 4, middle interconnecting piece 5 and copper bar connecting portion 6 composition, but as different from Example 1, battery core connecting portion 4, middle interconnecting piece 5, copper bar connecting portion 6 three form " serpentine bend " structure, but this kind of structure difficulty of processing is comparatively large, not as most preferred embodiment.
Embodiment 3
A kind of bus-bar being applied to Li-ion batteries piles, as different from Example 1, in the present embodiment, second sub-connection portion 52 and copper bar connecting portion 6 are positioned at the first both sides, sub-connection portion 51, first sub-connection portion 51 and the 3rd sub-connection portion 53 are positioned at the second both sides, sub-connection portion 52, and the second sub-connection portion 52 and battery core connecting portion 4 are positioned at the 3rd both sides, sub-connection portion 53.
When this embodiment makes consumptive material comparatively large, take up space large, overall performance is not good, not as the embodiment of the best.
Embodiment 4
Be applied to a bus-bar for Li-ion batteries piles, as different from Example 3, in the present embodiment, the second sub-connection portion 52 and battery core connecting portion 4 are positioned at the 3rd sub-connection portion 53 homonymy.
This embodiment in the same manner as in Example 3, during making consumptive material comparatively large, take up space large, overall performance is not good, not as the embodiment of the best.
Embodiment 5
A kind of bus-bar being applied to Li-ion batteries piles, as different from Example 1, first sub-connection portion 51 is not be positioned at copper bar connecting portion 6 one side end with copper bar connecting portion 6 junction, and the 3rd sub-connection portion 53 is not be positioned at battery core connecting portion 4 one side end with battery core connecting portion 4 junction.
The middle interconnecting piece 5 of this embodiment is under the prerequisite that middle interconnecting piece 5 current path length with embodiment 1 is equal, and manufacture difficulty increases.
According to above-described embodiment, just the utility model can be realized well.What deserves to be explained is; under prerequisite based on said structure design; for solving same technical problem; even if some making on the utility model are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the utility model, therefore it also should in protection range of the present utility model.

Claims (6)

1. be applied to a bus-bar for Li-ion batteries piles, it is characterized in that, comprise copper bar (3), multiple monomer battery core (1) being connected in parallel to copper bar (3) respectively by sheet metal (2); Described sheet metal (2) to be made up of and one-shot forming the battery core connecting portion (4) connected in turn, middle interconnecting piece (5) and copper bar connecting portion (6), and described middle interconnecting piece (5) is made up of multiple sub-connection portion connected in turn and the cross-sectional width in each sub-connection portion is less than the cross-sectional width of battery core connecting portion (4) and copper bar connecting portion (6).
2. a kind of bus-bar being applied to Li-ion batteries piles according to claim 1, it is characterized in that, described middle interconnecting piece (5) is by the first sub-connection portion (51), second sub-connection portion (52), 3rd sub-connection portion (53) composition also one-shot forming, one end in the first sub-connection portion (51) is connected with copper bar connecting portion (6) side is vertical, one end in the second sub-connection portion (52) is connected with the other end in the first sub-connection portion (51) is vertical, 3rd end, sub-connection portion (53) is connected with second sub-connection portion (52) the other end is vertical, the other end in the 3rd sub-connection portion (53) is connected with the side of battery core connecting portion (4) is vertical.
3. a kind of bus-bar being applied to Li-ion batteries piles according to claim 2, it is characterized in that described second sub-connection portion (52) and copper bar connecting portion (6) are positioned at the first sub-connection portion (51) homonymy, first sub-connection portion (51) and the 3rd sub-connection portion (53) are positioned at the second sub-connection portion (52) both sides, and the second sub-connection portion (52) and battery core connecting portion (4) are positioned at the 3rd sub-connection portion (53) homonymy.
4. a kind of bus-bar being applied to Li-ion batteries piles according to claim 3, it is characterized in that, battery core connecting portion (4) connect the 3rd connecting portion (53) the bar-shaped trough (41) parallel with the first connecting portion (51) or the 3rd connecting portion (53) is also provided with to middle side part.
5. a kind of bus-bar being applied to Li-ion batteries piles according to claim 1-4 any one, is characterized in that, the cross-sectional width value range in described each sub-connection portion is 1mm-2mm.
6. a kind of bus-bar being applied to Li-ion batteries piles according to claim 5, is characterized in that, described sheet metal (2) is nickel sheet.
CN201521106052.3U 2015-12-25 2015-12-25 Be applied to busbar of lithium ion battery group Expired - Fee Related CN205211838U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105449150A (en) * 2015-12-25 2016-03-30 成都雅骏新能源汽车科技股份有限公司 Bus bar applied to lithium ion battery pack
CN106058132A (en) * 2016-08-10 2016-10-26 北京联动天翼科技股份有限公司 Nickel sheet used for connecting 18650 batteries in series and parallel
CN111512467A (en) * 2018-01-31 2020-08-07 三星Sdi株式会社 Battery pack
US11158910B2 (en) 2017-12-05 2021-10-26 Industrial Technology Research Institute Battery busbar

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105449150A (en) * 2015-12-25 2016-03-30 成都雅骏新能源汽车科技股份有限公司 Bus bar applied to lithium ion battery pack
CN106058132A (en) * 2016-08-10 2016-10-26 北京联动天翼科技股份有限公司 Nickel sheet used for connecting 18650 batteries in series and parallel
US11158910B2 (en) 2017-12-05 2021-10-26 Industrial Technology Research Institute Battery busbar
CN111512467A (en) * 2018-01-31 2020-08-07 三星Sdi株式会社 Battery pack

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160504

Termination date: 20211225