CN108933296B - Lithium ion battery pack - Google Patents
Lithium ion battery pack Download PDFInfo
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- CN108933296B CN108933296B CN201710376461.2A CN201710376461A CN108933296B CN 108933296 B CN108933296 B CN 108933296B CN 201710376461 A CN201710376461 A CN 201710376461A CN 108933296 B CN108933296 B CN 108933296B
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- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- 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
- H01M10/613—Cooling or keeping cold
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- 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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- 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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
- H01M10/6555—Rods or plates arranged between the cells
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- 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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
- H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
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- 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
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a lithium ion battery pack. The device of the invention comprises: the battery pack lower box body, the at least two battery modules, the switch box and the battery pack upper cover are arranged, wherein two adjacent battery modules in the at least two battery modules are laterally placed at the bottom of the battery pack lower box body in a back-to-back mode, so that the length direction of the battery modules is consistent with the width direction of the battery pack lower box body, and the height direction of the battery modules is consistent with the length direction of the battery pack lower box body; and a water cooling plate is arranged between two adjacent battery modules in the at least two battery modules. According to the lithium ion battery pack, the battery module is laterally placed and fixed, the two battery modules are assembled back to back, the width direction of the battery module is matched with the length direction of the lithium ion battery pack, the space utilization rate of the battery pack with surplus height space in the height direction can be improved, and therefore the energy density of the lithium ion battery pack is improved. And compact structure, the assembly is simple, easily the volume production realizes.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery pack.
[ background of the invention ]
At present, with the rapid development of the new energy automobile industry, people pay more and more attention to how to improve the stable and safe cruising ability of new energy automobiles. In the existing new energy automobile power battery, the lithium ion battery has relatively low production cost, can be repeatedly charged, is very convenient to use, and has higher cost advantage compared with other portable energy sources.
In the prior art, the improvement of the cruising ability of the whole lithium ion battery pack can effectively improve the cruising ability of the lithium ion battery pack by placing the battery cores as much as possible in the limited vehicle-mounted space and improving the energy density, and the improvement of the battery pack structure is realized, namely, placing the battery modules as much as possible in the specific battery pack space becomes an important mode for improving the energy density of the battery pack. At present, the fixed mode of battery module is normally placed in most battery wraps to square power battery module as an example, length dimension > width dimension > height dimension promptly, and the direction of the width of battery module is unanimous with the length direction of box under the battery package, and the direction of the length of battery module is unanimous with the width direction of box under the battery package, and the horizontal direction space that the battery module that normally places occupy promptly is greater than the direction of height space.
In the process of implementing the invention, the inventor finds that in the placement scheme of the battery module in the prior art, for the battery pack with a tense space in the horizontal direction and a surplus space in the height direction, the placement device is not beneficial to effectively utilizing the space, and the number of the battery modules placed in the same space is less, so that the energy density of the lithium battery pack is lower.
[ summary of the invention ]
The invention provides a lithium ion battery pack, which overcomes the defects that in the prior art, space in the horizontal direction is insufficient, space in the height direction is redundant, and the energy density of the battery pack is low due to the arrangement of battery modules, realizes the arrangement of more battery modules in the same space, effectively improves the utilization rate of the lithium ion battery pack in the height space direction, and further improves the energy density of the lithium ion battery pack.
The invention provides a lithium ion battery pack, comprising: box, two at least battery module, switch box and battery package upper cover under the battery package, wherein:
two adjacent battery modules of the at least two battery modules are laterally placed at the bottom of the lower box body of the battery pack in a back-to-back mode, so that the length direction of the battery modules is consistent with the width direction of the lower box body of the battery pack, and the height direction of the battery modules is consistent with the length direction of the lower box body of the battery pack; a water cooling plate is arranged between two adjacent battery modules in the at least two battery modules;
the switch box is positioned above the at least two battery modules; the battery pack is covered on the switch box, can be matched with the lower box body, and forms a closed box body with the lower box body, so that the at least two battery modules and the switch box are closed in the box body.
Further, still include fuse box upper cover, fuse box upper cover set up on the battery package upper cover, just fuse box upper cover can open towards the box outside, the fuse box sets up in the switch box.
Further, the water cooling plate comprises a heat conduction double-sided adhesive tape adhered to the surfaces of the two sides of the water cooling plate.
Furthermore, module supporting cushion blocks are respectively arranged between two adjacent back-to-back battery modules and at two ends of the two adjacent back-to-back battery modules, and the two module supporting cushion blocks are respectively arranged at two sides of the water cooling plate; and a first threaded hole and a second threaded hole for fixing two adjacent back-to-back battery modules are respectively formed in two sides of each module supporting cushion block, and a third threaded hole is formed in the middle of each module supporting cushion block.
Furthermore, a water-cooling plate fixing plate is arranged between each battery module and the water-cooling plate in the two adjacent back-to-back battery modules, and the water-cooling plate fixing plate and the module supporting cushion block are respectively positioned at two sides of the water-cooling plate at the same end of the two adjacent back-to-back battery modules; and a fourth threaded hole is formed in the water cooling plate fixing plate, and a bolt is adopted to penetrate through the fourth threaded hole in the water cooling plate fixing plate, the water cooling plate and the third threaded hole in the module supporting cushion block to fix the water cooling plate to the module supporting cushion block.
Furthermore, two ends of two outer sides of the two adjacent back-to-back battery modules are respectively provided with a module narrow fixing plate, a fifth threaded hole is formed in each module narrow fixing plate, a bolt penetrates through the fifth threaded hole in each module narrow fixing plate, the battery module and the first threaded hole or the second threaded hole in each module supporting cushion block, the battery module is fixed to each module supporting cushion block, and meanwhile a first locking hole is formed in each module narrow fixing plate.
Furthermore, two ends of two adjacent back-to-back battery modules are respectively provided with a module wide fixing plate, and each module wide fixing plate is used for locking two module narrow fixing plates arranged at two sides of the two adjacent back-to-back battery modules; the upper end of the module wide fixing plate is further provided with a locking column, and the locking column is locked with the first locking hole.
Furthermore, the battery module locking device further comprises a module long fixing plate, wherein second locking holes are formed in two ends of the module long fixing plate respectively, and the two second locking holes are also locked with the locking columns which are arranged on the module wide fixing plates at two ends of the two adjacent back-to-back battery modules respectively.
Further, the lower ends of the module narrow fixing plate, the module wide fixing plate and the module long fixing plate are respectively provided with a through hole for respectively fixing the module narrow fixing plate, the module wide fixing plate and the module long fixing plate at the bottom of the lower box body.
Furthermore, the lower box body of the battery pack and the upper cover of the battery pack are respectively provided with a flanging structure;
and a sealing strip is also arranged between the battery pack lower box body flanging structure and the flanging structure of the battery pack upper cover.
According to the lithium ion battery pack, the battery module is laterally placed and fixed, two batteries are assembled back to back, the length direction of the battery module is consistent with the width direction of the lower box body of the battery pack, the height direction of the battery module is matched with the length direction of the lithium ion battery pack, the space utilization rate of the lithium ion battery pack with surplus height space in the height direction can be improved, and therefore the energy density of the lithium ion battery pack is improved. The lithium ion battery pack is compact in structure, simple to assemble and easy to realize mass production.
[ description of the drawings ]
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of a lithium ion battery pack according to the present invention;
fig. 2 is a schematic structural diagram of a water-cooling plate of a lithium ion battery pack according to an embodiment of the present invention;
FIG. 3 is another state diagram of the lithium-ion battery pack shown in FIG. 1;
fig. 4 is a schematic structural diagram of a pair of back-to-back battery modules in a lithium ion battery pack according to an embodiment of the present invention;
FIG. 5 is an exploded view of FIG. 4;
fig. 6 is a schematic structural diagram of a module support pad of a lithium ion battery pack according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a lithium ion battery pack according to the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a lithium ion battery pack according to a first embodiment of the present invention. As shown in fig. 1, the apparatus of the present embodiment may include: the battery pack comprises a battery pack lower box body 1, at least two battery modules 2, a switch box 3 and a battery pack upper cover 4.
As shown in fig. 1, in the lithium ion battery pack of the present embodiment, in order to firmly fix at least two battery modules 2 at the bottom of the lower case 1 of the battery pack, in the actual assembly, the battery modules 2 of the at least two battery modules 2 are combined in pairs in a back-to-back manner, and then are laterally placed at the bottom of the lower case 1 of the battery pack. Specifically, two adjacent battery modules 2 of the at least two battery modules 2 are laterally placed at the bottom of the battery pack lower case 1 in a back-to-back manner, so that the length direction of the battery modules 2 is consistent with the width direction of the battery pack lower case 1, and the height direction of the battery modules 2 is consistent with the length direction of the battery pack lower case 1.
At present, the fixed mode of battery module 2 is normally placed in most lithium ion battery package, takes shape power battery module as an example, and the horizontal direction space that normally the battery module 2 of placing occupy is greater than the direction of height space, and this is unfavorable for the rational utilization space to some horizontal direction space shortage, the surplus battery package space in direction of height space. In this case, the present embodiment employs the battery module 2 to be placed on the side, thereby placing more battery modules 2 in a limited space. In fig. 1, three sets of back-to-back battery modules are placed as an example, and in practical applications, the number of the battery modules 2 is specifically set according to the size of the lower case 1 of the battery pack.
The inside electric core that is equipped with of battery module 2, electric core in the charge-discharge use, can produce the heat. The too high of electric core temperature, can influence the working property of battery module 2 to battery package life produces the influence, consequently, need consider the radiating problem of electric core simultaneously when battery module 2 places, be provided with water-cooling plate 10 between two adjacent battery modules 2 in at least two battery modules 2 in this embodiment, it cools off for the battery module 2 of both sides simultaneously. The water cooling plate 10 can be connected with an external water cooling system to take away heat generated by the operation of the battery module 2, so that the battery module 2 can operate at a proper temperature and maintain the optimal operating performance.
Fig. 2 is a schematic structural diagram of a water-cooling plate of a lithium ion battery pack according to an embodiment of the present invention. As shown in fig. 2. The water cooling plate 10 is integrated with a square tube water cooling plate, a water cooling collector and the like, and is used for cooling the battery module 2, so that the battery module 2 is used at the optimal temperature, and the service life of the battery module 2 is prolonged. The flow passage of the water cooling plate 10 is a mouth-shaped pipe formed by extruding aluminum. The size and thickness of the port tube can be designed according to the cooling requirements of the cell. The flow direction of the cooling liquid in the water cooling plate 10 can be designed according to the space and arrangement of the whole battery pack, so that the best water cooling effect is ensured. In fig. 2, the water-cooling plate 10 includes an upper water-cooling plate and a lower water-cooling plate, and the number of the water-cooling plates 10 in practical application is set according to the size of the battery module 2, so as to ensure that the heat of each battery module 2 can be taken away by the water-cooling plate 10.
As shown in fig. 1, the switch box 3 of the present embodiment is located above at least two battery modules 2; the switch box 3 is a component of an integrated battery pack electrical element, and mainly comprises a battery control system, and all functions of controlling the switch, charging and discharging and the like of the whole battery pack.
The battery pack lower case 1 is a member that bears the weight of the entire battery pack, and includes a fixing structure for fixing the battery pack to a vehicle body, a structure for fixing internal battery modules, and the like, so that it is necessary to reinforce the strength and rigidity of the battery pack lower case 1. In this embodiment, under the battery package box 1 can adopt the sheet metal component to bend the welding, perhaps sheet metal component punching press welding, perhaps aluminum alloy casting, perhaps modes such as aluminum alloy die-casting are made and are formed to guarantee the intensity of whole battery package.
As shown in fig. 1, the battery pack upper cover 4 of the present embodiment is disposed on the switch box 3, and a protrusion corresponding to the shape and size of the switch box 3 is disposed on the upper surface, so that the switch box 3 can be inserted into the protrusion. The battery pack upper cover 4 can be matched with the battery pack lower box body 1 to form a closed box body with the battery pack lower box body 1, so that at least two battery modules 2 and the switch box 3 are enclosed in the box body shown in figure 3. Fig. 3 is another state diagram of the lithium ion battery pack shown in fig. 1. Fig. 3 is an appearance diagram of a closed box formed by the battery pack upper cover 4 and the battery pack lower box 1 after assembling at least two battery modules 2 in a back-to-back manner and laterally placing the battery packs lower box 1 at the bottom, arranging the switch box 3 on the battery modules 2 and covering the battery pack upper cover 4.
In the lithium ion battery pack of the embodiment, the battery module is laterally placed and fixed, and the two battery modules are assembled back to back, so that the length direction of the battery module is consistent with the width direction of the lower box body of the battery pack, and the height direction of the battery module is matched with the length direction of the lithium ion battery pack, so that the space utilization rate of the lithium ion battery pack with surplus height space in the height direction can be improved, and the energy density of the lithium ion battery pack is improved. And the lithium ion battery pack of the embodiment has compact structure, simple assembly and easy realization of mass production.
Fig. 4 is a schematic structural diagram of a pair of back-to-back battery modules in a lithium ion battery pack according to an embodiment of the invention. Fig. 5 is an exploded view of the structure of fig. 4. In this embodiment, based on the first embodiment, the structure of the back-to-back battery module in the lithium ion battery pack of the present invention is further described in more detail.
Fig. 4 and 5 illustrate the structure of the lithium ion battery pack of the present embodiment by taking a pair of back-to-back battery modules in the lithium ion battery pack as an example. In practical applications, the lithium ion battery pack may include a plurality of pairs of back-to-back battery modules as shown in fig. 4 and 5. For example, fig. 1 illustrates an example of the present invention including three pairs of battery modules as shown in fig. 5.
As shown in fig. 5, in the lithium ion battery pack of the present embodiment, the double-sided thermal adhesive tapes 6 are further adhered to the surfaces of both sides of the water-cooling plate 10. The heat-conducting double-sided adhesive tape 6 is used for improving the heat conductivity between the battery module 2 and the water cooling plate 10, and the effect that the heat of the battery module 2 is sufficiently taken away by the water cooling plate 10 is achieved. Meanwhile, the gap between the bottom plate of the battery module 2 and the water cooling plate 10 is made up, so that the whole structure is more compact and firmer. In this embodiment, 4 double-sided thermal adhesive tapes 6 may be attached to the surfaces of both sides of the water-cooled plate 10 as shown in fig. 2, and the water-cooled plate 10 may be tightly sandwiched between 2 battery modules. The heat conduction efficiency between the cooling interface at the bottom of the battery module and the water cooling plate 10 can be improved by the heat conduction double-sided adhesive tape 6, and meanwhile, the gap between the bottom of the module and the water cooling plate 10 caused by the uneven bottom of the module can be made up, so that the assembly precision is improved.
Further, as shown in fig. 5, in the lithium ion battery pack of this embodiment, module supporting cushion blocks 12 are further respectively disposed between two back-to-back battery modules 2 and at two ends of two adjacent back-to-back battery modules 2, and the two module supporting cushion blocks 12 are respectively disposed at two sides of the water cooling plate 10, one of the module supporting cushion blocks 12 is disposed between one of the two adjacent back-to-back battery modules 2 and the water cooling plate 10, and the other module supporting cushion block 12 is disposed between the other of the two adjacent back-to-back battery modules 2 and the water cooling plate 10.
Fig. 6 is an enlarged view of the structure of the module spacer of the lithium ion battery pack shown in fig. 5. As shown in fig. 6, the two ends of the module spacer 12 of this embodiment may be stepped. The two sides of each module support cushion block 12 of this embodiment are respectively provided with a first threaded hole a and a second threaded hole (not shown) for fixing two adjacent back-to-back battery modules 2, wherein the second threaded hole is located on the other side of the module support cushion block 12 shown in fig. 6, i.e. the side of the back of the first threaded hole a. And first screw hole A and second screw hole decentraction can guarantee the fastness that module bearing pad 12 is connected with two battery module 2 back to back respectively. And a third threaded hole C for fixing the water-cooling plate fixing plate 9 is formed in the middle of the module supporting cushion block 12. So fixed both sides battery module 2 both ends after not parallel and level, can enough reduce the size in the battery module 2 direction of height like this, can guarantee that water-cooling board 10 is in after fixing and is pressed from both sides tight state according to the step height of the thickness adjustment module supporting cushion 12 of water-cooling board 10 simultaneously, improves cooling efficiency. Meanwhile, the module supporting cushion block 12 can limit the distance between two adjacent battery modules 2 back to back, and damage to the water cooling plate 10 due to over-compression is avoided. The module support cushion block 12 is realized by adopting an aluminum alloy die-casting process, has light weight and high strength and is suitable for mass production.
Further, as shown in fig. 5, in the lithium ion battery pack of this embodiment, a water-cooling plate fixing plate 9 is further disposed between each battery module 2 and the water-cooling plate 10 in two adjacent back-to-back battery modules 2, and at the same end of the two adjacent back-to-back battery modules 2, the water-cooling plate fixing plate 9 and the module support cushion 12 are respectively located at two sides of the water-cooling plate 10; the middle part of the water cooling plate fixing plate 9 is provided with a fourth threaded hole D, in this embodiment, two water cooling plate fixing plates 9 at two ends of the water cooling plate 10 are connected through the fourth threaded hole D on the water cooling plate fixing plate and a third threaded hole C of the fixing water cooling plate fixing plate 9 arranged in the middle of the module supporting cushion block 12 by adopting two bolts, and the water cooling plate 10 is fixed to the module supporting cushion block 12, so that the purpose of fastening the water cooling plate 10 is achieved. The main part of water-cooling board 10 is crowded shape mouth type pipe, and the heat conduction is effectual, but intensity is lower, presss from both sides tight water-cooling board through module lip block 12 and water-cooling board fixed plate 9 and has improved the rigidity of water-cooling board 10, and the distance of restriction battery module bottom plate and water-cooling board surface when battery module 2 assembles simultaneously protects the water-cooling board main part not because of over-compressing leads to damaging.
Further, as shown in fig. 5, in the lithium ion battery pack of the present embodiment, two sides of two adjacent back-to-back battery modules 2 and two ends of two outer sides of each battery module 2 are further provided with module narrow fixing plates 7, so that two outer sides of a pair of back-to-back battery modules 2 have four module narrow fixing plates 7 in total. The upper end and the lower end of each narrow module fixing plate 7 are respectively provided with a fifth threaded hole E, the long bolts 8 are adopted to be matched and connected with the corresponding first threaded holes A or the second threaded holes A on the module supporting cushion blocks 12 between the two battery modules 2 through the fifth threaded holes E on the narrow module fixing plates, and the battery modules 2 are fixed on the module supporting cushion blocks 12, so that the battery modules 2 are locked in the length direction, the rigidity of the combination of the battery modules 2 is improved, and the purposes of laterally placing the battery modules and fixing the two battery modules are achieved. And a first locking hole F is also formed in the module narrow fixing plate 7.
Further, as shown in fig. 5, in the lithium ion battery pack of this embodiment, two ends of two adjacent back-to-back battery modules 2 are further provided with module wide fixing plates 11, respectively, and each module wide fixing plate 11 is used for locking two module narrow fixing plates 7 arranged at two sides of the two adjacent back-to-back battery modules 2; and the two ends of the upper end of each module wide fixing plate 11 are also respectively provided with a locking column G, and specifically, locking is realized by fixing a first locking hole lock F on the module narrow fixing plate 7 on the locking column G on the module wide fixing plate 11 on the corresponding side. The narrow module fixing plates 7 at the two ends of the two adjacent back-to-back battery modules 2 can lock the four narrow module fixing plates 7 on the two sides of the two adjacent back-to-back battery modules, so that the strength of the battery module combination in the height direction of the battery module is enhanced. Meanwhile, a wire harness fixing hole is reserved in the side edge of the module wide fixing plate 11 and used for fixing a wire harness, so that the wiring inside the battery pack is neat, and the reliability of fixing the wire harness is improved.
Further, as shown in fig. 5, in the lithium ion battery pack of this embodiment, two module length fixing plates 13 disposed in parallel are further disposed in the length direction of the battery modules above the two battery modules 2 disposed back to back, two ends of each module length fixing plate 13 are respectively provided with a second locking hole H, and the second locking holes H at two ends of the module length fixing plate 13 are also respectively locked with the locking posts G disposed at two ends of the upper portion of the module width fixing plate 11 at two ends of the two adjacent back to back battery modules, so as to improve the strength of the two battery modules in the height direction of the battery modules after being fixed. The module long fixing plate 13 is provided with a through hole for fixing a wire harness and a through hole for fixing other components of the battery pack, so that the integration level of the battery pack is improved.
Further, as shown in fig. 5, in the lithium ion battery pack of the present embodiment, the module narrow fixing plate 7, the module wide fixing plate 11 and the module long fixing plate 13 lock two battery modules 2 placed back to back in the length, width and height directions to form a locked combination, as shown in fig. 5. The lower ends of the module narrow fixing plate 7 and the module wide fixing plate 11 are respectively provided with a through hole which is a first through hole I and a second through hole J, and the whole two batteries 2 which are locked by the module narrow fixing plate 7 and the module wide fixing plate 11 and are placed back to back are fixed at the bottom of the battery pack lower box body 1 through the first through hole I and the second through hole J.
The lithium ion battery pack of the present embodiment is described by taking the above-mentioned heat-conducting double-sided tape 6, the water-cooling plate fixing plate 9, the module supporting pad 12, the module narrow fixing plate 7, the module wide fixing plate 11, and the module long fixing plate 13 as examples. In practical applications, the aforementioned double-sided thermal adhesive tape 6, the water-cooled plate fixing plate 9, the module supporting pad 12, the module narrow fixing plate 7, the module wide fixing plate 11, and the module long fixing plate 13 may be combined at will to form an optional technical solution of the present invention, which is not described herein again.
The lithium ion battery pack of the present embodiment can improve the energy density of the lithium ion battery pack not only in a highly limited space. And further through adopting the heat conduction double faced adhesive tape, further strengthened the heat conductivity between water-cooling board and the battery module, be convenient for battery module's heat dissipation. Through adopting module supporting cushion, can link together two battery module back to back more firmly. Through adopting the narrow fixed plate of module, the wide fixed plate of module and the long fixed plate of module can set up two battery module back to back into a firm whole, the battery module group intensity back to back when reinforcing side is put prevents rocking of battery module when using, has further guaranteed can work under more stable operational environment of battery module.
Fig. 7 is a schematic structural diagram of another embodiment of a lithium ion battery pack according to the present invention. The lithium ion battery pack of the present embodiment may further include the following technical solutions on the basis of the technical solutions of the above embodiments.
In the lithium ion battery package of this embodiment, battery package upper cover 4 sets up on switch box 3, can adopt the sheet metal component to bend the welding according to the atress condition and the service behavior of upper cover, perhaps sheet metal component punching press welding, perhaps mode such as combined material makes and forms. Preferably, as shown in fig. 7, the battery pack upper cover 4 and the battery pack lower case 1 are respectively provided with a sealing flanging structure, and the battery pack upper cover 4 can be matched with the battery pack lower case 1 to form a closed case with the battery pack lower case 1, so as to enclose the battery module 2 and the switch box in the case, as shown in fig. 7. Furthermore, a sealing strip is arranged between the flanging structure of the lower box body 1 of the battery pack and the flanging structure of the upper cover 4 of the battery pack, so that the waterproof and dustproof performance of the battery pack is ensured.
Further, as shown in fig. 7, in the lithium ion battery pack of the present embodiment, the switch box 3 is integrated with a fuse box, the fuse box is disposed inside the switch box 3, the fuse box upper cover 5 is a cover plate of the fuse box and is disposed on the battery pack upper cover 4, and the fuse box upper cover 5 can be opened toward the outside of the battery pack upper cover 4.
The fuse is easy to damage in the using process, so that the fuse needs to be replaced frequently. In the traditional battery pack, the fuse is arranged in the battery pack, when the fuse is replaced, the upper cover of the battery pack needs to be opened, the workload is large, the replacement efficiency is low, and other parts in the battery pack can be damaged. The interchangeability of the fuse is a consideration in the design of the battery pack. By adopting the structure of the embodiment, the fuse can be replaced by only opening the fuse box upper cover 5, the operation is very simple, and the use is very convenient.
In the lithium ion battery pack related to the embodiment, the battery module is laterally placed and fixed, two batteries are assembled back to back, the length direction of the battery module is consistent with the width direction of the lower box body of the battery pack, and the width direction of the battery module is matched with the length direction of the battery pack, so that the space utilization rate of the battery pack with surplus height space in the height direction can be improved, and the energy density of the battery pack is improved; the water cooling plate between the battery modules can be effectively cooled, so that the battery modules can be used at the optimal temperature; and the fuse upper cover is arranged on the fuse upper cover, so that the fuse is easy to replace. The lithium ion battery pack of the embodiment has the advantages of compact overall structure, simple assembly and easy realization of mass production.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A lithium ion battery pack, comprising: box, two at least battery module, switch box and battery package upper cover under the battery package, wherein:
every two adjacent battery modules in the at least two battery modules are laterally placed at the bottom of the lower box body of the battery pack in a back-to-back mode, so that the length direction of the battery modules is consistent with the width direction of the lower box body of the battery pack, and the height direction of the battery modules is consistent with the length direction of the lower box body of the battery pack; a water cooling plate is arranged between every two adjacent back-to-back battery modules in the at least two battery modules;
the switch box is positioned above the at least two battery modules; the battery pack is covered on the switch box, can be matched with the lower box body and forms a closed box body with the lower box body so as to seal the at least two battery modules and the switch box in the box body;
module supporting cushion blocks are respectively arranged between two adjacent back-to-back battery modules and at two ends of the two adjacent back-to-back battery modules, and the two module supporting cushion blocks are respectively arranged at two sides of the water cooling plate; and a first threaded hole and a second threaded hole which are used for fixing two adjacent back-to-back battery modules and are not concentric are respectively arranged on two sides of each module supporting cushion block, and a third threaded hole is arranged in the middle of each module supporting cushion block.
2. The lithium ion battery pack according to claim 1, further comprising a fuse box upper cover provided on the battery pack upper cover and openable toward the outside of the case, the fuse box being provided in the switch box.
3. The lithium ion battery pack of claim 1, further comprising a thermally conductive double-sided adhesive tape adhered to surfaces on both sides of the water-cooled plate.
4. The lithium ion battery pack according to claim 1, wherein a water-cooling plate fixing plate is further disposed between each of the two adjacent back-to-back battery modules and the water-cooling plate, and the water-cooling plate fixing plate and the module support cushion block are respectively disposed on two sides of the water-cooling plate at the same end of the two adjacent back-to-back battery modules; and a fourth threaded hole is formed in the water cooling plate fixing plate, and a bolt is adopted to penetrate through the fourth threaded hole in the water cooling plate fixing plate, the water cooling plate and the third threaded hole in the module supporting cushion block to fix the water cooling plate to the module supporting cushion block.
5. The lithium ion battery pack according to claim 1, wherein module narrow fixing plates are further provided at both ends of both outer sides of two adjacent back-to-back battery modules, a fifth threaded hole is provided in each module narrow fixing plate, and the battery modules are fixed to the module support cushion by bolts passing through the fifth threaded holes in the module narrow fixing plates, the first threaded holes or the second threaded holes in the battery modules and the module support cushion, and the first locking holes are further provided in the module narrow fixing plates.
6. The lithium ion battery pack according to claim 5, wherein module wide fixing plates are respectively disposed at two ends of two adjacent back-to-back battery modules, and each module wide fixing plate is used for locking two module narrow fixing plates disposed at two sides of two adjacent back-to-back battery modules; the upper end of the module wide fixing plate is further provided with a locking column, and the locking column is locked with the first locking hole.
7. The lithium ion battery pack of claim 6, further comprising a module long fixing plate, wherein two ends of the module long fixing plate are respectively provided with a second locking hole, and two second locking holes are also respectively locked with the locking posts on the module wide fixing plates disposed at two ends of two adjacent back-to-back battery modules.
8. The lithium ion battery pack according to claim 7, wherein the module narrow fixing plate, the module wide fixing plate and the module long fixing plate are respectively provided at lower ends thereof with through holes for respectively fixing the module narrow fixing plate, the module wide fixing plate and the module long fixing plate at the bottom of the lower case.
9. The lithium ion battery pack according to any one of claims 1-8, wherein the battery pack lower case and the battery pack upper cover are respectively provided with a flanging structure;
and a sealing strip is also arranged between the battery pack lower box body flanging structure and the flanging structure of the battery pack upper cover.
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| CN201710376461.2A CN108933296B (en) | 2017-05-25 | 2017-05-25 | Lithium ion battery pack |
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| CN201710376461.2A CN108933296B (en) | 2017-05-25 | 2017-05-25 | Lithium ion battery pack |
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| CN108933296B true CN108933296B (en) | 2020-11-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3907775A4 (en) | 2019-01-09 | 2022-02-23 | BYD Company Limited | Power battery pack and electric vehicle |
| CN110010807A (en) * | 2019-03-15 | 2019-07-12 | 骆驼集团新能源电池有限公司 | A kind of rectangular aluminum-shell battery double-mold group |
| CN112993431A (en) * | 2019-12-13 | 2021-06-18 | 中车时代电动汽车股份有限公司 | Water-cooling battery package and electric automobile |
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| CN108933296A (en) | 2018-12-04 |
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