CN101714620A - Battery pack and method for connecting same - Google Patents

Battery pack and method for connecting same Download PDF

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Publication number
CN101714620A
CN101714620A CN200810167447A CN200810167447A CN101714620A CN 101714620 A CN101714620 A CN 101714620A CN 200810167447 A CN200810167447 A CN 200810167447A CN 200810167447 A CN200810167447 A CN 200810167447A CN 101714620 A CN101714620 A CN 101714620A
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China
Prior art keywords
electrode terminal
battery pack
cell
facing surfaces
pack according
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CN200810167447A
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Chinese (zh)
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朱建华
吉英亮
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BYD Co Ltd
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BYD Co Ltd
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Priority to CN200810167447A priority Critical patent/CN101714620A/en
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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 invention provides a battery pack which comprises a plurality of single batteries, wherein each single battery is provided with two electrode terminals; the adjacent single batteries are connected by the electrode terminals in series or in parallel; the connected electrode terminal is provided with opposite surfaces and fixed by welding blocks formed by welding welding filler on the opposite surfaces. The welding blocks have the function of fusing protection. By selecting suitable welding filler, when the current of the battery pack is overloading, the welding filler is melted by heat absorbed by the welding blocks, the connection of the battery pack is disconnected, thereby providing automatic fusing protection to the battery pack.

Description

The method of battery pack and connection battery pack
Technical field
The present invention relates to battery pack, relate in particular to the connection of battery pack.
Background technology
Along with in short supply, the rise of the oil price of oil, electric automobile and mixed power vehicle more and more show its superiority.As its core component, what the connection of battery pack showed is even more important, and forms battery pack by the serial or parallel connection cell vehicle is powered.
CN201051525Y discloses a kind of battery pack, and as shown in Figure 1, this battery pack comprises a plurality of cells 1, and cell 1 has positive electrode terminal 2 and negative electrode terminal 3.Cell 1 is connected in series, and the annexation between the electrode terminal is for being fitted and connected, still, during overload the fail safe of this battery pack relatively poor, damage battery pack easily.
Summary of the invention
The invention provides a kind of battery pack, to overcome problems of the prior art with fuse protection function.
According to battery pack of the present invention; this battery pack comprises a plurality of cells; each cell has two electrode terminals; adjacent described cell is connected by described electrode terminal or is in parallel; wherein; connected described electrode terminal has facing surfaces, and forms welding block by solder on described facing surfaces and fix, and described welding block has the fuse protection function.
By welding the electrode terminal of described cell; the electrode terminal that can connect described battery pack and fixing described cell; because described welding block is the unique media that connects described cell; during described battery pack operating overload; overheated described welding block can fuse, thereby protects described battery pack.
For obtaining battery pack of the present invention, the present invention also provides a kind of method that connects battery pack, and this method may further comprise the steps: the electrode terminal bending of cell is drawn; Cell is installed, make adjacent electrode terminal form facing surfaces, and scolder is filled in the space between described facing surfaces; Heat the welding block of described scolder with the described electrode terminal that forms a fixed connection; Described method of attachment makes a plurality of cells form the battery pack of serial or parallel connection.
Can make described electrode terminal obtain different facing surfaces by different bendings, thereby form the battery pack of different structure.
Description of drawings
Fig. 1 is the cutaway view of the battery pack of prior art;
Fig. 2 is the structural representation according to the series battery of one embodiment of the present invention;
Fig. 3 is the structural representation according to the series battery of another embodiment of the invention;
Fig. 4 is the structural representation according to the batteries in parallel connection group of another execution mode of the present invention.
Embodiment
Battery pack of the present invention comprises a plurality of cells 1, cell 1 has positive electrode terminal 2 and negative electrode terminal 3, a plurality of cells 1 are connected by two electrode terminals that connect the adjacent monomer battery or are in parallel, wherein, described electrode terminal has facing surfaces and fixedly connected by the welding block 4 of solder formation.
Figure 2 shows that the battery pack of one embodiment of the present invention, shown being connected in series between two cells in the battery pack.Series battery comprises a plurality of cells 1, cell 1 comprises positive electrode terminal 2 and negative electrode terminal 3, by solder fixedly connected facing surfaces on the positive electrode terminal 2 of adjacent cell 1 and the negative electrode terminal 3, thereby series connection forms battery pack.
In execution mode shown in Figure 2, adjacent positive electrode terminal 2 and negative electrode terminal 3 have the end face of alignment, just facing surfaces.
Particularly, the negative electrode terminal 3 that makes the positive electrode terminal 2 of cell 1 and adjacent cell 1 respectively in same horizontal plane bending and laterally (directions X among Fig. 2) draw; Install cell 1, make adjacent positive electrode terminal 2 and negative electrode terminal 3 draw and make the end face alignment formation facing surfaces of electrode terminal in opposite directions, and make the space between the scolder filling facing surfaces; Form welding block 4 facing surfaces is welded together by adding hot solder.
Wherein, can adopt that electric iron adds the welding of thermal weld, LASER HEATING, air-heater adds thermal weld or high-frequency heating power adds technologies such as thermal weld, the end of positive electrode terminal 2 and the end of negative electrode terminal 3 be welded together by welding block 4.Preferably, can adopt high-frequency heating power heating welding procedure, soon the end of the end of positive electrode terminal 2, negative electrode terminal 3 and scolder are placed on high-frequency heating power induction coil below, by the high-frequency heating power heating, make solder fusing and the final welding block 4 that connects positive electrode terminal 2 and negative electrode terminal 3 that forms.
Scolder can be selected the material of easy fusing for use, and promptly resistivity is lower than the scolder of the fusing point of electrode terminal material greater than electrode terminal resistivity of material or fusing point.Preferably, scolder is a tin, because characteristics such as the resistivity of tin is big, fusing point is lower, during the operating current overload of battery pack, the heat that welding block 4 absorbs makes its automatic fusing easily, has disconnected the syndeton of battery pack, thus the protection battery pack.
Welding block 4 has the cross-sectional area S and the length L (i.e. distance between Dui Qi the electrode terminal end face) that is parallel to the sense of current (directions X among Fig. 2 and Fig. 4, Y direction among Fig. 3) perpendicular to the sense of current (Y direction among Fig. 2 and Fig. 4, directions X among Fig. 3).Electricalresistivity according to scolder 1, the resistance of welding block 4
Figure G2008101674472D0000031
Welding block 4 can be under predetermined overload current I effect, elapsed time t fusing, and in the overload current mechanism, the heat that welding block 4 absorbs
Figure G2008101674472D0000032
On the one hand, according to the fusing point T of scolder, the variations in temperature Δ T of welding block 4 in the time of can obtaining fusing, on the other hand, according to the specific heat C of scolder and mass M as can be known, Wherein, according to the density p of scolder 2As can be known, M=ρ 2* S * L, therefore,
Figure G2008101674472D0000034
Because the ρ of scolder 1, ρ 2With C be the constants of nature of material, and overload current I and time t are predetermined constant, therefore, Δ T=N/S 2, wherein N is by ρ 1, ρ 2, C, I and t decision constant, that is to say that Δ T is only relevant perpendicular to the cross-sectional area S of the sense of current with welding block 4, and irrelevant with length L.Under the certain situation of overload current I, cross-sectional area S is big more, and it is long more that welding block 4 reaches time of fusing point; S is more little for cross-sectional area; it is short more that welding block 4 reaches the time of fusing point, thereby can change the fuse protection performance of welding block 4 by different cross-sectional area S, to satisfy different protection requirements.
The cross-sectional area S of welding block 4 can change by the area of solder application.In the present embodiment, the cross-sectional area S of welding block 4 can be according to the application area of scolder and is adjusted in the scope of the face area that is not more than electrode terminal.Preferably, welding block 4 has covered the end face of electrode terminal, and therefore, the cross-sectional area S of welding block 4 is generally equal to the face area of electrode terminal.
In the series battery of another kind of execution mode shown in Figure 3, adjacent cell 1 is fixing by the facing surfaces welding of positive electrode terminal 2 and negative electrode terminal 3, wherein, connected positive electrode terminal 2 and negative electrode terminal 3 have stacked end mutually, and facing surfaces is formed on the stacked end.
Particularly, the negative electrode terminal 3 of the positive electrode terminal 2 of cell 1 and adjacent cell 1 bend respectively and laterally (directions X among Fig. 3) draw, and make on different level, bending of adjacent positive electrode terminal 2 and negative electrode terminal 3; After cell 1 was in place, the end face of positive electrode terminal 2 and negative electrode terminal 3 did not line up, and formed the stacked structure in end, thereby formed facing surfaces on the stacked end; Make scolder fill space between this facing surfaces; Add hot solder and form welding block 4 with fixedly connected facing surfaces.
In the present embodiment kind, the cross-sectional area S of welding block 4 can change in being not more than stacked facing surfaces areal extent.Preferably, welding block 4 covers this facing surfaces, and the cross-sectional area S of welding block 4 equals the area of facing surfaces.
In addition, above-mentioned two kinds of execution modes also can be applied to the batteries in parallel connection group.
Figure 4 shows that another execution mode of the present invention, wherein, battery pack is in parallel.Battery pack of the present invention comprises a plurality of cells 1, cell 1 comprises positive electrode terminal 2 and negative electrode terminal 3 (not shown), by solder fixedly connected the facing surfaces of positive electrode terminal 2 of two adjacent cells 1, the other end at battery, by solder fixedly connected the facing surfaces (not shown) of negative electrode terminal 3 of two cells 1, thereby form parallel battery.
In battery pack shown in Figure 4, the positive electrode terminal 2 of adjacent cell 1 has the end of the alignment of extending longitudinally, and facing surfaces is formed on the end of this longitudinal extension alignment.Welding block 4 welds together two positive electrode terminal 2 facing surfaces.
Particularly, positive electrode terminal 2 is drawn through bending for the first time and along laterally (directions X among Fig. 4), through bending for the second time make two positive electrode terminal 2 the end longitudinally (the Y direction among Fig. 4) extend; After cell was in place, bending for the first time made adjacent just click terminal 2 draw in opposite directions, and bending for the second time makes the end of two positive electrode terminal extend longitudinally and form facing surfaces; Make scolder fill the gap between the facing surfaces of a pair of positive electrode terminal 2; Add hot solder and form welding block 4 with fixedly connected facing surfaces.
The cross-sectional area S of the welding block 4 that obtains by present embodiment is relevant with the bending second time of electrode terminal; therefore; the cross-sectional area S of welding block 4 can adjust in the long-pending scope of the facing surfaces that is not more than the electrode terminal that longitudinally extends in parallel according to the application area of scolder, thereby changes the fuse protection of welding block 4.
In addition, preferably, welding block 4 has covered the described facing surfaces of described electrode terminal.But bend the second time that can pass through to prolong the length of electrode terminal or pass through in various degree, promptly under the situation of electrode terminal fixed size, can be by the gap (length L of welding block 4) between the end that changes electrode terminal, the facing surfaces of the electrode terminal that extends in parallel with change is long-pending.Therefore, the cross-sectional area S of welding block 4 can arbitrarily adjust.Because the fusing performance of welding block 4 is only relevant with the cross-sectional area S of welding block 4, and irrelevant with length L, therefore can be according to different needs and by changing the fuse protection performance that cross-sectional area S changes welding block 4.
In addition, present embodiment can also be applied to series battery.

Claims (13)

1. battery pack; this battery pack comprises a plurality of cells (1); it is characterized in that each cell (1) has two electrode terminals (2,3); adjacent described cell (1) is by electrode terminal (2; 3) connect or in parallel, connected described electrode terminal (2,3) has facing surfaces; and the welding block (4) that forms by solder on described facing surfaces is fixing, and described welding block (4) has the fuse protection function.
2. battery pack according to claim 1, wherein, the resistivity of described scolder is greater than the resistivity of the material of described electrode terminal (2,3).
3. battery pack according to claim 1 and 2, wherein, the fusing point of described scolder is lower than the fusing point of the material of described electrode terminal (2,3).
4. battery pack according to claim 1, wherein, described scolder is a tin.
5. battery pack according to claim 1, wherein, described facing surfaces is the end face of described electrode terminal (2,3).
6. battery pack according to claim 1, wherein, connected described two electrode terminals (2,3) of described cell (1) have stacked end mutually, and described facing surfaces is formed on the described stacked end.
7. battery pack according to claim 1, wherein, connected described two electrode terminals (2,3) of described cell (1) have the end of the alignment of extending longitudinally, and described facing surfaces is formed on the end of described longitudinal extension alignment.
8. battery pack according to claim 1, wherein, described welding block (4) covers the described facing surfaces of connected described electrode terminal (2,3).
9. method that connects battery pack, this method may further comprise the steps:
Electrode terminal (2, the 3) bending of cell (1) is drawn;
Cell (1) is installed, make adjacent electrode terminal (2,3) form facing surfaces, and scolder is filled in the space between described facing surfaces;
Heat the welding block (4) of described scolder with described electrode terminal (2,3) that form a fixed connection;
Make a plurality of cells form the battery pack of serial or parallel connection thus.
10. the method for connection battery pack according to claim 9 wherein, said method comprising the steps of:
Bend described electrode terminal (2,3) at same horizontal plane, install cell (1) after, the end face of electrode terminal (2,3) of the bending of adjacent cell (1) is alignd in opposite directions, to form described facing surfaces.
11. the method for connection battery pack according to claim 9 wherein, said method comprising the steps of:
Bending described electrode terminal (2,3) on different horizontal planes, install cell (1) after, the end face of the electrode terminal (2,3) of the bending of adjacent cell (1) does not line up and the cambium layer stack structure.
12. the method for connection battery pack according to claim 9 wherein, said method comprising the steps of:
Level is drawn through bending for the first time to make described electrode terminal (2,3), and through bending for the second time and extending longitudinally;
After installing cell (1), described first time, bending made the electrode terminal (2,3) of adjacent cell (1) draw in opposite directions, and the described bending second time makes the electrode terminal (2 of adjacent cell (1), 3) end parts parallel longitudinal extension is to form described facing surfaces.
13. the method for connection battery pack according to claim 9 wherein, heats the form a fixed connection described welding block (4) of described electrode terminal (2,3) of described scolder by adopting high-frequency heating power.
CN200810167447A 2008-10-08 2008-10-08 Battery pack and method for connecting same Pending CN101714620A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354593A (en) * 2011-09-29 2012-02-15 贵州天义汽车电器有限公司 Speed regulation resistor for automobile fan
CN102754240A (en) * 2010-02-09 2012-10-24 株式会社Lg化学 Battery module having enhanced welding reliability and medium or large battery pack including same
CN107528039A (en) * 2016-06-17 2017-12-29 罗伯特·博世有限公司 The battery module for manufacturing the method for battery module and being manufactured by the method
CN110024166A (en) * 2016-10-14 2019-07-16 伊奈维特有限责任公司 The contact plate of joint connections is melted for the height of arc protection including at least one
WO2020253609A1 (en) * 2019-06-17 2020-12-24 Dongguan Amperex Technology Limited Battery assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102754240A (en) * 2010-02-09 2012-10-24 株式会社Lg化学 Battery module having enhanced welding reliability and medium or large battery pack including same
CN102754240B (en) * 2010-02-09 2015-07-22 株式会社Lg化学 Battery module having enhanced welding reliability and medium or large battery pack including same
CN102354593A (en) * 2011-09-29 2012-02-15 贵州天义汽车电器有限公司 Speed regulation resistor for automobile fan
CN107528039A (en) * 2016-06-17 2017-12-29 罗伯特·博世有限公司 The battery module for manufacturing the method for battery module and being manufactured by the method
CN110024166A (en) * 2016-10-14 2019-07-16 伊奈维特有限责任公司 The contact plate of joint connections is melted for the height of arc protection including at least one
WO2020253609A1 (en) * 2019-06-17 2020-12-24 Dongguan Amperex Technology Limited Battery assembly

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Application publication date: 20100526