CN105789545A - Battery module, preparation method of battery module, battery pack and an electric car - Google Patents
Battery module, preparation method of battery module, battery pack and an electric car Download PDFInfo
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- CN105789545A CN105789545A CN201410814415.2A CN201410814415A CN105789545A CN 105789545 A CN105789545 A CN 105789545A CN 201410814415 A CN201410814415 A CN 201410814415A CN 105789545 A CN105789545 A CN 105789545A
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- battery
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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 discloses a battery module, a preparation method of the battery module, a battery pack and an electric car. The battery module comprises a battery and a connector of the battery, wherein the connector of the battery comprises an electrode connection strap; the electrodes of the battery are connected with the electrode connection strap through an atomic binding manner. In the battery module provided by the invention, the connector of the battery can be used for providing reliable connection and higher connection strength, and can be automatically produced, so that the production efficiency is improved. Moreover, the battery module provided by the invention has the effects of simplifying the structures of voltage sampling terminals and reducing the cost.
Description
Technical field
The present invention relates to field of batteries, in particular it relates to a kind of battery modules and preparation method thereof and battery bag and electric automobile.
Background technology
In assembling large-sized power cell process, it is often necessary to coupled together by the electrode of some element cells by electrode connecting piece, also need to connection voltage sample terminal in electrode connecting piece simultaneously.
In prior art, electrode connecting piece and voltage sample terminal generally adopt rivet to fix, then carry out laser weld.Not only can not carry out automated production, and the connector obtained there is also the insecure problem of welding.And the connection of battery electrode and electrode connecting piece there is also the insecure defect of welding, and electrode sealing construction is also had negative effect by welding process.
As can be seen here, it is necessary to overcome prior art to connect the defect that the connector of battery exists, it is provided that the reliable battery connecting structure of a kind of connection.
Summary of the invention
It is an object of the invention to the insecure defect of connection for overcoming existing battery electrode, electrode connecting piece and voltage sample terminal, it is provided that a kind of battery modules and preparation method thereof and battery bag and electric automobile.
To achieve these goals, the present invention provides a kind of battery modules, this battery modules includes: the connector of battery and battery, and the connector of described battery includes electrode connecting piece, and the mode being combined by atom between the battery electrode of described battery with described electrode connecting piece is attached.
The present invention also provides for a kind of method preparing battery modules, and the method includes: electrode connecting piece lain on the battery electrode of battery, adopts electromagnetic pulse welding described electrode connecting piece to be welded with described battery electrode.
The present invention also provides for a kind of battery modules prepared by method provided by the invention.
The present invention also provides for a kind of battery bag, and this battery bag includes multiple battery modules, and wherein, described battery modules is battery modules provided by the invention.
The present invention also provides for a kind of electric automobile, and this electric automobile includes multiple battery bag, and wherein, described battery bag is battery bag provided by the invention.
Battery modules provided by the invention, in the connector of battery therein, connects battery electrode and electrode connecting piece, electrode connecting piece and voltage sample terminal with atom combination, it is provided that connection reliably, higher bonding strength.And this connected mode can be implemented by automated production, improve manufacture efficiency.
Additionally battery modules provided by the invention can simplify the structure of voltage sample terminal therein is pure nickel structure, reduces cost.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below.In the accompanying drawings:
Fig. 1 is the schematic diagram that battery electrode provided by the invention is connected with electrode connecting piece；
Fig. 2 is the schematic diagram of the battery electrode of flanged provided by the invention；
Fig. 3 be battery electrode provided by the invention with electrode connecting piece weld schematic diagram；
Fig. 4 is the schematic diagram that the battery electrode of prior art is connected with electrode connecting piece；
Fig. 5 is the schematic diagram of the battery electrode of prior art；
Fig. 6 is the schematic diagram of connector provided by the invention；
Fig. 7 is the schematic diagram that voltage sample terminal provided by the invention is attached with electrode connecting piece provided by the invention；
Fig. 8 is the voltage sample terminal of prior art and the schematic diagram being connected with the electrode connecting piece of prior art；
Fig. 9 is electromagnetic pulse of the present invention weldering weld metallograph (in square frame, weld is without transition zone)；
Figure 10 is Laser Welding weld metallograph (in circle, weld is transition zone)；
Figure 11 is the metallograph of Laser Welding weld new life alloy fracture.
Description of reference numerals
1, the nickel dam of the voltage sample terminal 11 of the present invention, the aluminium lamination 12 of existing voltage sample terminal, existing voltage sample terminal
2, electrode connecting piece 3, flange face 31, electrode body
32, existing battery electrode 4, insulating sealer 5, battery cover board
6, fixture 7, arc 8, rivet
9, flexible print wiring board 10, laser weld
Detailed description of the invention
Hereinafter the specific embodiment of the present invention is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
The invention provides a kind of battery modules, as shown in Figure 1, this battery modules includes: the connector of battery and battery, and the connector of described battery includes electrode connecting piece 2, and the mode being combined by atom between the battery electrode of described battery with described electrode connecting piece 2 is attached.
The inventors found that in prior art, battery electrode as shown in Figure 5, when being connected with electrode connecting piece 2, battery electrode as shown in Figure 4 32 with in the connection of electrode connecting piece 2, battery electrode 32 and electrode connecting piece 2 use laser weld, the efficient weld area of weld seam 10 is less, and bonding strength is not enough, affects quality of connection.And the structure of existing battery electrode 32 is when being subjected to, welding action can make battery electrode 32 that the insulating sealer 4 of electrode is caused damage.Additionally, in prior art, electrode connecting piece is fixing with the rivet of voltage sample terminal needs design and processing fixed hole position in electrode connecting piece and voltage sample terminal, implement to also need to position, hole when connecting, it is impossible to realize the connection automation mechanized operation of electrode connecting piece and voltage sample terminal.And being also performed to laser weld after rivet is fixing, therefore technological process complexity soldering reliability is not high.In addition existing voltage sample terminal needs employing aluminum nickel composite material to adapt to connect the object of unlike material, and therefore voltage adopts the structure complexity of terminal, and manufacturing cost is high.To this, the present inventor improves the structure of one end that battery electrode contacts with electrode connecting piece, and between battery electrode with electrode connecting piece, the mode that is combined by atom between voltage sample terminal of electrode connecting piece is attached, not only against the problems referred to above, and the voltage sample terminal of pure iron metal can be adopted, obtain technical scheme.
According to the present invention, wherein, described battery electrode includes electrode body 31 and is positioned at the flange face 3 of electrode body 31 end, and described battery electrode is connected with described electrode connecting piece 2 by described flange face 3, and the area of described flange face 3 is the 120-180% of the area in the cross section of described electrode body 31.Described electrode body 31 is structure as a whole with described flange face 3.Described electrode body 31 is generally cylinder.The area of described flange face 3 and the cross section of described electrode body 31 are the area in the cross section of the axis perpendicular with described electrode body 31.The thickness of described flange face 3 is the 20-50% of the diameter of described electrode body 31.The diameter of described electrode body 31 refers to the diameter of the axial cross section of described electrode body 31.Increase flange face 3 in the end of described electrode body 31 and can increase the bonding area of electrode body 31 and electrode connecting piece 2, and this flange face 3 can also use fixture 6 when welding as supporting construction is convenient when welding, the welding operation damage to insulating sealer 4 can be avoided, as shown in Figure 3.The bonding area of battery electrode increases, it is also possible to being accurately positioned between battery electrode and electrode connecting piece 2 when reducing welding, simplifies welding process.The final result of welding is as shown in Figure 1.
The welding for the battery electrode 32 of prior art and electrode connecting piece 2 that Figure 4 and 5 show.The bonding area of battery electrode 32 is little, and the structure of battery electrode 32 cannot be arranged to protection insulating sealer 4 supporting construction, will affect insulating sealer 4 and battery cover board 5.
According to the present invention, wherein, the part that described electrode connecting piece 2 and described battery electrode are attached is arc 7.As shown in Figure 1.Being specially the part that electrode connecting piece 2 and flange face 3 be attached is arc 7.
According to the present invention, wherein, described battery includes battery cover board 5, and described battery cover board 5 is provided with fairlead, and has the insulating sealer 4 of through hole, and described insulating sealer is positioned at described fairlead；The described battery electrode described through hole of traverse and described fairlead.
According to the present invention, wherein, described flange face 3 and have spacing between the battery cover board 5 of the lower surface of flange face 3 vertical direction, the height of described spacing is 3-15mm.
According to the present invention, wherein, the connector of described battery also includes voltage sample terminal 1, and the mode being combined by atom between described voltage sample terminal 1 with described electrode connecting piece 2 is attached.Preferably, described voltage sample terminal 1 is single-layer metal sheet；It is highly preferred that described voltage sample terminal 1 is nickel sheet metal.In order to voltage sample terminal can be connected with the electrode connecting piece being generally aluminum side in prior art, opposite side welds with flexible print wiring board (FPC), generally adopt aluminum nickel composite material, as shown in Figure 8, electrode connecting piece 2 is connected the voltage sample terminal of the aluminum nickel composite material of prior art by rivet 8, the side being connected with electrode connecting piece 2 is aluminium flake 11, and what be connected with flexible print wiring board 9 is nickel sheet 12.In the connector of battery provided by the invention, the mode combined by atom is attached, voltage sample terminal can be connected directly between in the electrode connecting piece of aluminum only with nickel metal, the structure of voltage sample terminal can be simplified, save rivet to fix, facilitate automated manufacturing connector, also reduce the cost of connector, and connection reliability is better.
The mode combined by atom in the present invention is attached as non-melt welding manner, there is no the impact that normal welding is heated, and the weld seam provided is wider, it is provided that the reliability needed between battery electrode and electrode connecting piece, between electrode connecting piece and voltage sample terminal and bonding strength.
According to the present invention, described in be connected as non-melt welding manner, it is preferable that in situation, the interface being attached between described battery electrode and described electrode connecting piece, between described electrode connecting piece and described voltage sample terminal is absent from transition zone.Described transition zone refers to the structure of the metal of cover plate and housing metal molten recrystallization of formation under the welding manner of fusing or the brazing layer of welded cover plate and housing formation.
According to the invention it is preferred in situation, the width respectively 1-20mm of the part being attached between described battery electrode and described electrode connecting piece, between described electrode connecting piece and described voltage sample terminal；Preferred described width is 10-20mm.
According to the invention it is preferred in situation, the bonding strength respectively 100-1000MPa of the part being attached between described battery electrode and described electrode connecting piece, between described electrode connecting piece and described voltage sample terminal；It is preferably 150-600MPa.
In the present invention, described battery electrode can be fine copper, copper alloy or fine aluminium；Described electrode connecting piece can be fine aluminium, nickel, aluminium alloy, copper or silver.Battery electrode and electrode connecting piece can not simultaneously be same metal, namely can realize the connection of different metal between battery electrode and electrode connecting piece, facilitate the manufacture of battery modules.
The present invention also provides for a kind of method preparing battery modules, and the method includes: lie on the battery electrode of battery by electrode connecting piece 2, adopts electromagnetic pulse welding described electrode connecting piece 2 to be welded with described battery electrode.
According to the present invention, wherein, the welding energy of described electromagnetic pulse welding is 16-96KJ.
According to the present invention, wherein, as it is shown on figure 3, described battery includes battery cover board 5, described battery electrode runs through battery cover board 5, and and clamps insulating sealer 4 insulated enclosure between battery cover board 5；The method also includes: by the through hole on the insulating sealer 4 in the fairlead on described battery electrode 31 traverse battery cover board 5；The end of described battery electrode 31 is processed to form flange face 3, using fixture 6 to adopt electromagnetic pulse welding described electrode connecting piece 2 to be welded with described flange face 3 by the edge of flange face 3, described fixture 6 is absent from physical contact with described insulating sealer 4 and/or battery cover board 5.
According to the present invention, wherein, described electrode connecting piece 2 is welded with described battery electrode 31, described electrode connecting piece is formed arc 7.As shown in Figure 1.
According to the present invention, wherein, the method also includes；Voltage sample terminal 1 is lain in described electrode connecting piece 2, adopt electromagnetic pulse welding to be welded with described electrode connecting piece 2 by described voltage sample terminal 1.
According to the present invention, wherein, described voltage sample terminal 1 is placed on described arc 7 and carries out electromagnetic pulse welding.As it is shown in fig. 7, arc 7 as carrying out the gap that the voltage sample terminal 1 electromagnetic pulse with electrode connecting piece 2 is welded, can facilitate the operation of weldingvoltage sampling terminal 1, improve the efficiency of welding.The described arc degree of depth in the axial direction can be 0.5-3mm.
The present invention also provides for the battery modules that a kind of method provided by the invention prepares.
The present invention also provides for a kind of battery bag, and this battery bag includes multiple battery modules, and wherein, described battery modules is battery modules provided by the invention.
The present invention also provides for a kind of electric automobile, and this electric automobile includes multiple battery bag, and wherein, described battery bag is battery bag provided by the invention.
Hereinafter will be described the present invention by embodiment.
In following example, bonding strength adopts high product examine to survey company GP-TS2000M model instrument by pull force test method and records.
Embodiment 1
The present embodiment preparation method for the battery modules of the present invention is described.
(1) processing the battery electrode of battery as shown in Figure 2 with flange face, the area of flange face is 200mm2, the area in the cross section of battery electrode is 42.25mm2.Battery electrode is through battery cover board and insulating sealer, and between lower surface and the battery cover board of flange face, spacing is 10mm.
As shown in Figure 3, placing clamp, electrode connecting piece is lain against on flange face, in electrode connecting piece, then carry out electromagnetic pulse welding (welding equipment model PS48-16/25, PST company), welding energy is 16KJ, what obtain battery electrode and electrode connecting piece welds body, forms the arc that welding causes in electrode connecting piece, and the degree of depth is 2mm, the width of the part that flange face is connected with electrode connecting piece is 8mm, as shown in Figure 1.Wherein, battery electrode is copper, and electrode connecting piece is aluminum.
The welding body obtained is attached strength test, and bonding strength is 200MPa.
The structure and morphology of flange face and the part of the connection of electrode connecting piece is observed, as shown in Figure 9, it does not have alloy phase diagram with metallurgical microscope.
(2) as shown in Figure 7, the voltage sample terminal flat of nickel metal is placed in step (1) in electrode connecting piece formed arc on, voltage sample terminal carries out electromagnetic pulse welding, welding energy is 20KJ, the width of the part that voltage sample terminal is connected with electrode connecting piece is 5mm, as shown in Figure 6.Obtain the battery modules being welded with electrode connecting piece and voltage sample terminal on battery electrode.
The bonding strength of the part that test voltage sampling terminal is connected with electrode connecting piece is 200MPa.
With the structure and morphology of metallography microscope sem observation electrode connecting piece and the part of the connection of voltage sample terminal, as shown in Figure 9, it does not have alloy phase diagram.
Embodiment 2
The present embodiment preparation method for the battery modules of the present invention is described.
(1) processing the battery electrode of battery as shown in Figure 2 with flange face, the area of flange face is 200mm2, the area in the cross section of battery electrode is 42.25mm2.Battery electrode is through battery cover board and insulating sealer, and between lower surface and the battery cover board of flange face, spacing is 3mm.
As shown in Figure 3, placing clamp, electrode connecting piece is lain against on flange face, in electrode connecting piece, then carry out electromagnetic pulse welding (welding equipment model PS48-16/25, PST company), welding energy is 20KJ, what obtain battery electrode and electrode connecting piece welds body, forms the arc that welding causes in electrode connecting piece, and the degree of depth is 1.5mm, the width of the part that flange face is connected with electrode connecting piece is 10mm, as shown in Figure 1.Wherein, battery electrode is copper, and electrode connecting piece is aluminum.
The welding body obtained is attached strength test, and bonding strength is 300MPa.
The structure and morphology of flange face and the part of the connection of electrode connecting piece is observed, as shown in Figure 9, it does not have alloy phase diagram with metallurgical microscope.
(2) as shown in Figure 7, the voltage sample terminal flat of nickel metal is placed in step (1) in electrode connecting piece formed arc on, voltage sample terminal carries out electromagnetic pulse welding, welding energy is 20KJ, the width of the part that voltage sample terminal is connected with electrode connecting piece is 5mm, as shown in Figure 6.Obtain the battery modules being welded with electrode connecting piece and voltage sample terminal on battery electrode.
The bonding strength of the part that test voltage sampling terminal is connected with electrode connecting piece is 250MPa.
With the structure and morphology of metallography microscope sem observation electrode connecting piece and the part of the connection of voltage sample terminal, as shown in Figure 9, it does not have alloy phase diagram.
Embodiment 3
The present embodiment preparation method for the battery modules of the present invention is described.
(1) processing the battery electrode of battery as shown in Figure 2 with flange face, the area of flange face is 200mm2, the area in the cross section of battery electrode is 42.25mm2.Battery electrode is through battery cover board and insulating sealer, and between lower surface and the battery cover board of flange face, spacing is 15mm.
As shown in Figure 3, placing clamp, electrode connecting piece is lain against on flange face, in electrode connecting piece, then carry out electromagnetic pulse welding (welding equipment model PS48-16/25, PST company), welding energy is 32KJ, what obtain battery electrode and electrode connecting piece welds body, forms the arc that welding causes in electrode connecting piece, and the degree of depth is 1.5mm, the width of the part that flange face is connected with electrode connecting piece is 10mm, as shown in Figure 1.Wherein, battery electrode is copper, and electrode connecting piece is aluminum.
The welding body obtained is attached strength test, and bonding strength is 450MPa.
The structure and morphology of flange face and the part of the connection of electrode connecting piece is observed, as shown in Figure 9, it does not have alloy phase diagram with metallurgical microscope.
(2) as shown in Figure 7, the voltage sample terminal flat of nickel metal is placed in step (1) in electrode connecting piece formed arc on, voltage sample terminal carries out electromagnetic pulse welding, welding energy is 25KJ, the width of the part that voltage sample terminal is connected with electrode connecting piece is 13mm, as shown in Figure 6.Obtain the battery modules being welded with electrode connecting piece and voltage sample terminal on battery electrode.
The bonding strength of the part that test voltage sampling terminal is connected with electrode connecting piece is 200MPa.
With the structure and morphology of metallography microscope sem observation electrode connecting piece and the part of the connection of voltage sample terminal, as shown in Figure 9, it does not have alloy phase diagram.
Comparative example 1
(1) electrode connecting piece is positioned on battery electrode as shown in Figure 5, in electrode connecting piece, then carries out laser weld (equipment is disc8002, Tong Kuai company), welding energy is 3kW, weld width 1.5mm, obtains welding body, as shown in Figure 4.
The welding body obtained is attached strength test, and bonding strength is 50MPa.
With the structure and morphology of metallography microscope sem observation battery electrode and the junction of electrode connecting piece, as shown in Figure 10, there is newborn alloy phase diagram.Show newborn alloy place fracture metallographic, the bonding strength of the welding body that impact obtains in fig. 11.
(2) as shown in Figure 8, being fixed and carry out laser weld by the voltage sample terminal rivet of aluminium lamination and nickel dam compound, welding energy is 3kW, and weld width 1.5mm obtains connector.
Above-described embodiment 1-3 can adopt and produce in an automated fashion.In comparative example 1, voltage sample terminal needs rivet to fix, it is impossible to automated production, and the voltage sample terminal in comparative example 1 is aluminum nickel composite material, and material structure is complicated.
From the result of embodiment 1-3 it can be seen that battery modules provided by the invention, the connector of battery can have better bonding strength, the connection reliability obtained is higher；And automated production can be carried out and improve manufacture efficiency.
In battery modules provided by the invention; battery electrode not only increases the bonding strength of battery electrode and electrode connecting piece with flange face; and can as supporting construction to use fixture in implementing welding process, insulating sealer and/or the battery cover board of shield electrode are without damage.
In battery modules provided by the invention, connecting voltage sample terminal by implementing electromagnetic pulse welding in the way of atom combination, the structure of voltage sample terminal is simplified, and higher with the bonding strength of electrode connecting piece.
Claims (18)
1. a battery modules, this battery modules includes: the connector of battery and battery, and the connector of described battery includes electrode connecting piece, and the mode being combined by atom between the battery electrode of described battery with described electrode connecting piece is attached.
2. battery modules according to claim 1, wherein, described battery electrode includes electrode body and is positioned at the flange face of electrode body end, described battery electrode is connected with described electrode connecting piece by described flange face, and the area of described flange face is the 120-180% of the area in the cross section of described electrode body.
3. battery modules according to claim 1 and 2, wherein, the part that described electrode connecting piece and described battery electrode are attached is arc.
4. battery modules according to claim 2, wherein, described battery includes battery cover board, and described battery cover board is provided with fairlead, and has the insulating sealer of through hole, and described insulating sealer is positioned at described fairlead；The described battery electrode described through hole of traverse and described fairlead.
5. battery modules according to claim 4, wherein, described flange face and have spacing between the battery cover board of the lower surface of flange face vertical direction, the height of described spacing is 3-15mm.
6. battery modules according to claim 1, wherein, the connector of described battery also includes voltage sample terminal, and the mode that described voltage sample terminal is combined by atom between described electrode connecting piece is attached.
7. battery modules according to claim 6, wherein, described voltage sample terminal is nickel sheet metal.
8. the battery modules according to any one in claim 1,6 and 7, wherein, the interface being attached between described battery electrode and described electrode connecting piece, between described electrode connecting piece and described voltage sample terminal is absent from transition zone.
9. the battery modules according to any one in claim 1,6 and 7, wherein, the width respectively 1-20mm of the part being attached between described battery electrode and described electrode connecting piece, between described electrode connecting piece and described voltage sample terminal；Preferred described width is 10-20mm.
10. the battery modules according to any one in claim 1,6 and 7, wherein, the bonding strength respectively 100-1000MPa of the part being attached between described battery electrode and described electrode connecting piece, between described electrode connecting piece and described voltage sample terminal；It is preferably 150-600MPa.
11. the method preparing battery modules, the method includes: electrode connecting piece lain on the battery electrode of battery, adopts electromagnetic pulse welding described electrode connecting piece to be welded with described battery electrode.
12. method according to claim 11, wherein, described battery includes battery cover board, and described battery electrode runs through battery cover board, and and clamps insulating sealer insulated enclosure between battery cover board；The method also includes: the end of described battery electrode has been processed to form flange face, using fixture to adopt electromagnetic pulse welding described electrode connecting piece to be welded with described flange face by the edge of flange face, described fixture is absent from physical contact with described insulating sealer and/or battery cover board.
13. method according to claim 12, wherein, the method also includes；Voltage sample terminal flat is placed in described electrode connecting piece, adopts electromagnetic pulse welding to be welded with described electrode connecting piece by described voltage sample terminal.
14. method according to claim 13, wherein, described electrode connecting piece is welded with described battery electrode, described electrode connecting piece is formed arc；Described voltage sample terminal is placed on described arc and carries out electromagnetic pulse welding.
15. the method according to any one in claim 11-14, wherein, the welding energy of described electromagnetic pulse welding is 16-96KJ.
16. the battery modules that the method described in any one in claim 11-15 prepares.
17. a battery bag, this battery bag includes multiple battery modules, and wherein, described battery modules is the battery modules in claim 1-10 and 16 described in any one.
18. an electric automobile, this electric automobile includes multiple battery bag, and wherein, described battery bag is the battery bag described in claim 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410814415.2A CN105789545A (en) | 2014-12-23 | 2014-12-23 | Battery module, preparation method of battery module, battery pack and an electric car |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410814415.2A CN105789545A (en) | 2014-12-23 | 2014-12-23 | Battery module, preparation method of battery module, battery pack and an electric car |
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| CN105789545A true CN105789545A (en) | 2016-07-20 |
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Application publication date: 20160720 |