CN113224435A - High specific energy battery pack - Google Patents
High specific energy battery pack Download PDFInfo
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- CN113224435A CN113224435A CN202110467267.1A CN202110467267A CN113224435A CN 113224435 A CN113224435 A CN 113224435A CN 202110467267 A CN202110467267 A CN 202110467267A CN 113224435 A CN113224435 A CN 113224435A
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- cover plate
- battery
- battery module
- box body
- battery pack
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- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000741 silica gel Substances 0.000 claims abstract description 13
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 13
- 238000005192 partition Methods 0.000 claims description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- 239000004033 plastic Substances 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims 1
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000013461 design Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 239000004417 polycarbonate Substances 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a high specific energy battery pack, which comprises a main box body; a plurality of battery modules arranged in parallel are arranged in the main box body; an upper box cover is fixedly arranged at the top of the main box body; a first heat-conducting silica gel pad is arranged between each battery module and the contact surface at the bottom of the main box body; a second heat-conducting silica gel pad is arranged between each side surface of each battery module and the contact surface of the side wall of the main box body; each battery module comprises a battery module main body; the front side and the rear side of the battery module main body are respectively and vertically provided with an outer cover plate; an upper cover plate and a lower cover plate are respectively arranged below the battery module main body; the upper cover plate and the lower cover plate are respectively provided with a cover plate insulating sheet between the upper cover plate and the battery module main body; the left side and the right side of the battery module main body are respectively and vertically provided with a heating sheet; and a heat conduction silica gel sheet is arranged between each heating sheet and the battery module main body. The invention can improve the utilization rate of the whole space of the box body under the condition of ensuring the strength of the box body.
Description
Technical Field
The invention relates to the technical field of battery packs, in particular to a high specific energy battery pack.
Background
The requirement for improving the energy density of the battery pack is higher and higher in the existing electric automobile industry, most of the existing designs are light raw materials, so that the overall weight of the battery pack is reduced, and the overall energy density is improved.
However, when the weight is reduced and a novel material is selected, many safety accidents caused by insufficient box body strength also appear on the market. Under the condition that the strength and the volume of the box body are not changed, the space in the box body is effectively utilized as far as possible, and the problem of the current research is solved.
Disclosure of Invention
The invention aims to provide a high-specific-energy battery pack aiming at the technical defects in the prior art.
Therefore, the invention provides a high specific energy battery pack, which comprises a hollow main box body with an opening at the top;
a plurality of battery modules arranged in parallel are arranged in the main box body;
an upper box cover is fixedly arranged at the top of the main box body;
a heat-conducting silica gel pad is arranged between each battery module and the contact surface at the bottom of the main box body;
each battery module comprises a battery module main body;
the battery module main body comprises four battery cell combinations, and each battery cell combination comprises a plurality of battery cells stacked up and down;
the outer surface of each battery cell is wound with a PI film;
a PC sheet is placed between any two adjacent electric cores;
the two battery cell combinations positioned in front are arranged, and the lug arrangement surface of each battery cell is positioned on the front side of each battery cell combination; the two battery cell combinations positioned at the rear part are provided, and the lug arrangement surface of the battery cell is positioned at the rear side of the battery cell combination;
wherein, the front and the back sides of the main body of the battery module are respectively and vertically provided with an outer cover plate;
wherein, an upper cover plate and a lower cover plate are respectively arranged below the main body of the battery module;
the upper cover plate and the lower cover plate are respectively arranged between the upper cover plate and the battery module main body and are provided with a cover plate insulating sheet;
wherein, the left side and the right side of the battery module main body are respectively and vertically provided with a heating sheet;
a heat-conducting silica gel sheet is arranged between each heating sheet and the battery module main body;
for each battery module, two ends of a heating sheet are respectively provided with a module long screw hole site which is vertically penetrated;
each module long screw hole site is in threaded fixed connection with a supporting beam fixedly arranged on the inner side of the bottom of the main box body through a long screw.
Preferably, inner baffles are further arranged between the front side and the rear side of the battery module main body and each outer cover plate;
each inner partition plate and the position between the adjacent outer cover plates are respectively provided with a battery cell group bus bar;
the battery cores positioned in front are grouped into busbars and are also connected with a PCB acquisition board;
and the wiring harness collected by the PCB is embedded into a wire groove arranged on the inner clapboard.
Preferably, for each battery module, two plastic cover plates are arranged above the upper cover plate at intervals;
a bridging aluminum row is arranged below each plastic cover plate;
the both ends of cross-over connection aluminium row are connected with adjacent electric core gang bus respectively.
Preferably the bridging aluminium row is shaped like a "U".
Preferably, a bottom plastic partition plate is arranged below the aluminum row in a bridging manner;
and the bridging aluminum row is fixedly connected with the upper cover plate through a first fixing screw penetrating through the bottom plastic partition plate.
Preferably, the upper end and the lower end of the outer cover plate are respectively connected with the adjacent ends of the upper cover plate and the lower cover plate through second fastening screws.
Preferably, the box body pressing beam device further comprises a plurality of box body pressing beams;
and the long screw rods positioned on the same transverse straight line all penetrate through the reserved through holes on the same box pressing beam.
Preferably, the heating sheet is a PTC heating sheet;
and a PC sheet without gum is placed between any two adjacent electric cores.
Preferably, the battery pack further comprises an LMU acquisition board, and the LMU acquisition board is connected with the PCB acquisition board on each battery module and the communication port on the main box body respectively through a wire harness.
Preferably, the left and right sides of the main box body are respectively and fixedly provided with a plurality of lifting lugs.
Compared with the prior art, the technical scheme provided by the invention has the advantages that the high-specific-energy battery pack is scientific in structural design, the overall space utilization rate of the box body can be improved under the condition that the strength of the box body is ensured, the market application prospect of products of battery manufacturers can be improved, and the high-specific-energy battery pack has great practical significance.
Through inspection, the battery pack provided by the invention has the advantages that the overall structural strength of the box body is high, the sealing and waterproof performance is good, the requirement of the level above IP67 can be met, meanwhile, the compact frame type module design improves the overall space utilization rate of the box body, and the standard modular module design has interchangeability and foolproof effects, so that the battery pack is a real safe, reliable and high specific energy battery pack.
Drawings
Fig. 1 is a diagram of the arrangement of battery cells of any battery module in a high specific energy battery pack provided by the present invention;
fig. 2 is a schematic diagram illustrating the grouping of any battery module in a high specific energy battery pack according to the present invention;
fig. 3 is an exploded view of any one of the battery modules in the high specific energy battery pack according to the present invention;
FIG. 4 is an exploded view of a high specific energy battery pack according to the present invention;
FIG. 5 is a schematic view illustrating the alternate installation of battery modules in a high specific energy battery pack according to the present invention;
FIG. 6 is a schematic diagram of the heat dissipation of the battery module in the case of the high specific energy battery pack according to the present invention;
FIG. 7 is a schematic diagram of the installation and data acquisition of the bus bars of the battery module in the high specific energy battery pack according to the present invention;
fig. 8 is a schematic view of the fixing of the battery module box in the high specific energy battery pack provided by the present invention.
Detailed Description
In order to make the technical means for realizing the invention easier to understand, the following detailed description of the present application is made in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that in the description of the present application, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
In addition, it should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the term "mounted" and the like should be interpreted broadly, and may be, for example, either fixedly mounted or detachably mounted.
The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
Referring to fig. 1 to 8, the present invention provides a high specific energy battery pack, including a hollow main case 1 having an open top;
a plurality of battery modules 2 arranged in parallel are arranged in the main box body 1;
an upper box cover 3 is fixedly arranged at the top of the main box body 1.
In the present invention, in a specific implementation, a heat conductive silicone pad 101 is disposed between a contact surface of each battery module 2 and the bottom of the main case 1.
In the present invention, in a specific implementation, referring to fig. 3, each battery module 2 includes a battery module main body;
the battery module main body comprises four battery cell combinations, and each battery cell combination comprises a plurality of battery cells 20 stacked up and down;
it should be noted that, two battery cells located in front are combined, and a tab setting surface of a battery cell is located on the front side of the battery cell combination; the two battery cell combinations positioned at the rear part are provided, and the lug arrangement surface of the battery cell is positioned at the rear side of the battery cell combination;
wherein, the front and the back sides of the main body of the battery module are respectively and vertically provided with an outer cover plate 21;
wherein, an upper cover plate 251 and a lower cover plate 252 are respectively arranged below the battery module main body;
an upper cover plate 251 and a lower cover plate 252, each of which has a cover plate insulating sheet 26 disposed between itself and the battery module main body;
wherein, the left and right sides of the battery module main body are respectively and vertically provided with a heating plate 27 (such as a PTC heating plate);
a heat conducting silica gel sheet 28 is arranged between each heating sheet 27 and the battery module main body;
in the concrete implementation, the positions between the front side and the rear side of the battery module main body and each outer cover plate 21 are also provided with inner partition plates 22;
each inner partition 22 and the adjacent outer cover plate 21 are further provided with a battery cell group bus bar 23;
in the concrete implementation, the battery cells positioned in front are grouped into busbars 23, and are also connected with a PCB acquisition board 24;
in a specific implementation, the wiring harness 240 of the PCB board acquisition 24 is embedded in the wire groove 220 disposed on the inner partition 22.
It should be noted that the cell grouping bus bar 23 is used for laser welding with the tab on the cell 20.
In the present invention, the PCB acquisition board 24 is used for acquiring information of individual cells in the battery module, and a plurality of acquisition harnesses led out from the PCB acquisition board 24 are connected to the cell grouping bus bar 23.
In particular, for each battery module, two plastic cover plates 29 are arranged above the upper cover plate 251 at intervals;
a bridging aluminum row 30 is arranged below each plastic cover plate 29;
and the two ends of the aluminum bar 30 are connected with the adjacent cell grouping busbars 23 respectively.
In particular, the bridging aluminum row 30 is shaped like a U.
In the concrete implementation, a bottom plastic partition plate 31 is arranged below the aluminum row 30 in a bridging manner;
the bridging aluminum row 30 is screwed and fixed with the upper cover plate 251 by a first fixing screw 321 penetrating through the bottom plastic partition 31 (the first fixing screw 321 vertically penetrates through the reserved opening on the bottom plastic partition 31).
In concrete implementation, the cell grouping busbar 23 located at the rear side of the battery module main body is connected with the total positive and negative bolting columns 33 (two in total).
It should be noted that the two total positive and negative bolt posts 33 are installed in the main case 1 as total positive and total negative output terminals of the battery module for a single battery module, and the serial connection between the battery modules and the power connection in the battery pack are realized by the inter-module bus bars 102.
In a specific implementation, the upper end and the lower end of the outer cover plate 21 are respectively connected to the adjacent ends of the upper cover plate 251 and the lower cover plate 252 through the second fastening screws 322.
In the specific implementation, the upper cover plate 251 and the lower cover plate 252 are both aluminum profile end plates.
In the present invention, for each battery module 2, two ends of the heating plate 27 therein are respectively provided with a module long screw hole 270 which is vertically penetrated;
each module long screw hole 270 is in threaded fixed connection with a support beam 11 fixedly arranged on the inner side of the bottom of the main box body 1 through a long screw 103.
In a specific implementation, the battery pack further comprises a plurality of box pressing beams 104;
the long screws 103 on the same transverse straight line penetrate through holes reserved on the same box body pressing beam 104; therefore, the plurality of battery modules in the main case 1 are pressed and fixed in the lateral and vertical directions by the case pressing beam 104 and the long screw 103.
In the invention, for the battery module, the bus bar assembly (namely the battery core grouped bus bar 23) is welded by laser, the total positive and negative bars of the module are copper-aluminum composite, and the surfaces of the total positive and negative bolt connecting columns are copper;
in the invention, for a battery module, a busbar assembly is fixed on an inner partition plate through hot melting of a hot melting column, and then integrally mounted on the upper part of a battery core, and is connected with the battery core through laser welding convergence;
in the invention, in the concrete implementation, the inner partition board is designed with a sliding groove so as to facilitate the installation of a PCB acquisition board of the module, the inner partition board 22 is also provided with a boss, the corresponding part of the outer cover board 21 is provided with an opening, and the outer cover board 21 and the inner partition board 22 are connected through a self-tapping screw;
in the invention, in particular, for the battery module, the PTC heating plate is in contact with the battery cell through the heat-conducting silicone sheet 28;
in the invention, in particular, for an LMU (local battery monitoring unit) acquisition board 17, a shell is made of aluminum, so that the light weight is realized, and the energy density of the whole box body is improved;
in the invention, the bus bars are made of copper bus bars, so that the cost is reduced, the electric conductivity is excellent, and the temperature rise in the high-rate charge and discharge process is reduced;
in the invention, the upper box cover 3 is an aluminum box cover, so that the weight is reduced, and the energy density of the whole battery pack is improved;
in the invention, in the concrete implementation, a cavity for fixing the module is formed in the main box body 1, and meanwhile, a support beam 11 (omega beam) for welding nuts is arranged at the bottom of the main box body to play the functions of reinforcing the box body and installing the module;
in the invention, in a concrete implementation, the box body pressing beam 104 is used for fixing the battery module;
in the invention, in the concrete implementation, the lifting lugs 19 (namely the hanging lugs) fixedly arranged at the left side and the right side of the main box body 1 are used for hoisting in the process of packaging and loading the battery pack;
in the present invention, in a specific implementation, a PI film is wound on the outer surface of each cell 20;
a non-adhesive PC (polycarbonate) sheet is placed between any two adjacent cells 20.
For fixing the battery module, the battery module is bolted to the bottom of the main case by means of long screws and weld nuts on the support beams 11 (omega beams), and the battery module is fastened in series to the side of the case by means of case pressure beams 104.
In order to more clearly understand the technical solution of the present invention, the following description is given with reference to specific embodiments to illustrate the working principle of the present invention.
As shown in fig. 1 and fig. 2, a PI film (polyimide film) is wound on the outer surface of each cell 20 to ensure good insulation, and then the cells are externally arranged as shown in fig. 1, the cells are insulated by using an insulating PC film, the arranged cells are extruded and positioned on a tool, and an upper cover plate 251, a lower cover plate 252 and a heating plate 27 are installed to form a frame, so that a battery module is preliminarily formed;
as shown in fig. 7, in the combination of the internal partition 22 of the battery module, the cell grouping busbar 23 and the harness of the PCB board acquisition 24, the harness 240 of the PCB board acquisition 24 is ultrasonically welded to the cell grouping busbar 23 by ultrasonic welding, and then the welded assembly is assembled with the internal partition 22, the harness 240 in the assembly is spread and fixed by a wiring groove (i.e., a wiring groove 220) on the internal partition 22, and the cell grouping busbar 23 (specifically, an aluminum bar) is thermally fused and fixed by a thermal fusion column 221 on the internal partition 22.
As shown in fig. 3, after the assembly of fig. 1, 2, and 7, the combination of the internal partition 22, the cell grouping busbar 23, and the wiring harness of the PCB board acquisition 24 is mounted on the ear surface of the cell of the battery module, the internal partition 22 is fixed to the upper cover plate 251 and the lower cover plate 252 of the battery module by the second fixing screw 322, then the battery module enters the laser welding process of the cell grouping busbar 23 (specifically, aluminum bars) and the cell tabs, and after the welding is completed, the plastic cover plate 29 and the outer cover plate 21 are mounted and fastened by screws, so that the assembly of one battery module is completed;
as shown in fig. 4, when assembling the battery pack, the positive and negative output terminal boxes (i.e., power terminal boxes) 12, the fuse 13, the Maintenance Switch (MSD)14, the communication port 16, the heating port 15, the total positive and negative connecting rows, the total positive and negative output row protective plastic frame 18, and the lifting lugs 19 are sequentially mounted on the front portion of the case, and as shown in fig. 5, a module is mounted; as shown in fig. 7, the battery module is fixed by a long screw;
in the present invention, in a specific implementation, the battery pack further includes a plurality of inter-module bus bars 102, and two ends of each inter-module bus bar are respectively used for connecting a total positive and negative bolt post 33 of the adjacent battery module 2, so as to realize series connection among six battery modules in the battery pack and ensure an electrical connection path in the battery pack.
In the invention, in a concrete implementation, the front part inside the battery pack box body is provided with the total positive and negative output row protection plastic frame 18 which is bolted with the threaded hole on the installation seat of the fuse 13, and the total positive and negative output row protection plastic frame 18 at the front part inside the battery pack box body can play an insulation protection role on the total positive and negative connection rows.
In the invention, in a concrete implementation, the battery pack further comprises an LMU acquisition board (including a wiring harness) 17, and the LMU acquisition board 17 is respectively connected with the PCB acquisition board 24 on each battery module and the communication port 16 on the main box body 1 through the wiring harness, so that the communication port 16 is accessed through external equipment to monitor information such as battery voltage, temperature, SOC and the like in the battery pack.
As shown in fig. 7, fixing the battery module 2 on the support beam 11 (such as omega beam) at the bottom of the main box 1 by using the long screw 103, as shown in fig. 4, and then installing the inter-module bus bar 102 and the LMU collection plate (including the wire harness) 17;
as shown in fig. 5, the adjacent battery modules 2 in each row are arranged alternately, so that the effective space in the box is greatly utilized;
as shown in fig. 6, the contact surface between the battery module 2 and the bottom of the main case 1, and the contact surface between the battery module and the PTC heating sheet (heating sheet 27) all have a heat-conducting silica gel structure (specifically including a heat-conducting silica gel pad 101 and a heat-conducting silica gel sheet 28) as a heat-conducting medium, so as to greatly improve the heat dissipation rate of the battery module;
in particular, the used heat-conducting silica gel pad needs to ensure that the compression amount is about 50 percent, so that the heat conductivity is maximum;
in particular, a wiring groove (i.e., a wire groove) is designed on the inner partition 22, and is used for protecting and planning a sampling wire harness of the PCB acquisition board;
in the concrete implementation, binding wire slots are arranged on an upper cover plate and a lower cover plate on the upper side and the lower side of the battery module for binding collection harnesses in the box;
in the concrete implementation, a total positive and negative output row protection plastic frame 18 is designed near the front part of the inner side of the battery pack for insulation protection.
In the specific implementation, the battery cell adopted by the invention is preferably a small lithium iron phosphate battery cell, the battery module structure is developed, the utilization of the whole installation space of the module in the box body is combined, and the specific heat conduction design of the module is combined, so that the battery pack with high specific energy and better heat dissipation effect is formed.
Based on the technical scheme, the invention provides the high specific energy battery pack which comprises a battery module, a box body assembly, an LMU acquisition board, a bus bar, a wire harness and high and low voltage plug-ins; the battery module comprises an electric core, an inner baffle plate, an outer cover plate, a busbar component, an insulating piece, an upper end plate, a lower end plate, a PTC heating plate, a heat-conducting silica gel plate, a collection PCB component and the like, wherein a PI film is wound outside the electric core, no gum PC (polycarbonate) sheet is placed between the electric core, the frame consisting of the PTC heating plate and the upper end plate and the lower end plate is fixed, the heat-conducting silica gel pad is pasted between the PTC heating plate and the electric core, the electric core is connected with the electric core through the busbar laser welding, and a plastic cover plate is assembled outside; the module is fixed with the bottom of the box body through a long bolt and is reinforced through a box body pressing beam; the single cell information acquisition and detection in the battery module is connected to the PCB acquisition board of each module through an in-box wiring harness, and finally collected on the LMU acquisition board; after the whole battery pack is installed, the protection level above IP67 can be met.
Compared with the prior art, the high specific energy battery pack provided by the invention has the following beneficial effects:
1. the battery module frame type assembly mode is reliable in grouping, and meanwhile, the standardized module mode is convenient for fool-proofing in the maintenance and installation processes;
2. the module frame structure is adopted, and the module fixing point positions are designed asymmetrically, so that when the module is put into a box, the adjacent vertical modules can be installed alternately, and the space utilization rate of the box body is increased;
3. the four large surfaces of the module can be contacted with the aluminum PTC and the upper and lower end plates through the heat-conducting silica gel pads, so that the whole heat dissipation effect is good, and the service life of the battery is prolonged;
4. the collecting wire harness is fixed on the inner partition plate through the wiring groove and then integrally assembled at the upper end of the module for laser welding fixation;
5. the module is fixed with the bottom of the box body through a long bolt and is reinforced through a box body pressing beam.
Compared with the prior art, the high-specific-energy battery pack provided by the invention has the advantages that the structural design is scientific, the overall space utilization rate of the box body can be improved under the condition of ensuring the strength of the box body, the market application prospect of products of battery manufacturers can be improved, and the high-specific-energy battery pack has great practical significance.
Through inspection, the battery pack provided by the invention has the advantages that the overall structural strength of the box body is high, the sealing and waterproof performance is good, the requirement of the level above IP67 can be met, meanwhile, the compact frame type module design improves the overall space utilization rate of the box body, and the standard modular module design has interchangeability and foolproof effects, so that the battery pack is a real safe, reliable and high specific energy battery pack.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A high specific energy battery pack is characterized by comprising a hollow main box body (1) with an open top;
a plurality of battery modules (2) arranged in parallel are arranged in the main box body (1);
an upper box cover (3) is fixedly arranged at the top of the main box body (1);
a heat-conducting silica gel pad (101) is arranged between the contact surface of each battery module (2) and the bottom of the main box body (1);
wherein each battery module (2) comprises a battery module main body;
the battery module main body comprises four battery cell combinations, and each battery cell combination comprises a plurality of battery cells (20) stacked up and down;
the outer surface of each cell (20) is wound with a PI film;
a PC sheet is placed between any two adjacent electric cores (20);
the two battery cell combinations positioned in front are arranged, and the lug arrangement surface of each battery cell is positioned on the front side of each battery cell combination; the two battery cell combinations positioned at the rear part are provided, and the lug arrangement surface of the battery cell is positioned at the rear side of the battery cell combination;
wherein, the front and the back sides of the main body of the battery module are respectively and vertically provided with an outer cover plate (21);
wherein, an upper cover plate (251) and a lower cover plate (252) are respectively arranged below the battery module main body;
the upper cover plate (251) and the lower cover plate (252) are respectively provided with a cover plate insulation sheet (26) between the battery module main body and the upper cover plate and the lower cover plate;
wherein, the left side and the right side of the battery module main body are respectively and vertically provided with a heating sheet (27);
a heat-conducting silicon rubber sheet (28) is arranged between each heating sheet (27) and the battery module main body;
for each battery module (2), two ends of the heating sheet (27) are respectively provided with a module long screw hole site (270) which is vertically penetrated;
each module long screw hole (270) is in threaded fixed connection with a supporting beam (11) fixedly arranged on the inner side of the bottom of the main box body (1) through a long screw (103).
2. The high specific energy battery pack according to claim 1, wherein an inner partition plate (22) is further provided between each of the outer cover plates (21) and the front and rear sides of the battery module main body;
each inner partition plate (22) and the position between the adjacent outer cover plates (21) are also respectively provided with a battery cell group bus bar (23);
the battery core group bus bar (23) positioned in front is also connected with a PCB acquisition board (24);
the wiring harness (240) of the PCB acquisition (24) is embedded into a wire groove (220) arranged on the inner clapboard (22).
3. The high specific energy battery pack according to claim 2, wherein two plastic cover plates (29) are provided at intervals above the upper cover plate (251) for each battery module;
a bridging aluminum row (30) is arranged below each plastic cover plate (29);
and two ends of the aluminum bar (30) are bridged and are respectively connected with the adjacent battery cell group bus bars (23).
4. The high specific energy battery pack of claim 3, wherein the cross-over aluminum row (30) is substantially U-shaped.
5. The high specific energy battery pack of claim 3, wherein a bottom plastic spacer (31) is further provided across the lower portion of the aluminum row (30);
the bridging aluminum row (30) is fixedly connected with the upper cover plate (251) in a threaded mode through a first fixing screw (321) penetrating through the bottom plastic partition plate (31).
6. The high specific energy battery pack according to claim 1, wherein the upper and lower ends of the outer cover plate (21) are coupled to the adjacent ends of the upper cover plate (251) and the lower cover plate (252) by second fastening screws (322), respectively.
7. The high specific energy battery pack of claim 1, further comprising a plurality of case compression beams (104);
and a plurality of long screws (103) positioned on the same transverse straight line all penetrate through holes reserved on the same box body pressing beam (104).
8. The high specific energy battery pack of claim 1, wherein the heat patch (27) is a PTC heat patch;
and a PC sheet without gum is placed between any two adjacent electric cores (20).
9. The high specific energy battery pack according to any one of claims 2 to 5, wherein the battery pack further comprises an LMU acquisition board (17), and the LMU acquisition board (17) is connected to the PCB acquisition board (24) of each battery module and the communication port (16) of the main box body (1) through a wire harness.
10. The high specific energy battery pack according to claim 1, wherein the main case (1) is fixedly provided at left and right sides thereof with a plurality of lifting lugs (19), respectively.
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| CN113224435B (en) | 2024-06-11 |
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