CN110911604A - Power battery pack - Google Patents
Power battery pack Download PDFInfo
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- CN110911604A CN110911604A CN201911231308.6A CN201911231308A CN110911604A CN 110911604 A CN110911604 A CN 110911604A CN 201911231308 A CN201911231308 A CN 201911231308A CN 110911604 A CN110911604 A CN 110911604A
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- battery pack
- power battery
- plate
- longitudinal beam
- battery
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a power battery pack which comprises a lower shell, a battery module and an upper shell assembly. Two crossbeams and a plurality of longerons are fixedly installed in the lower casing, and a plurality of longerons are arranged between two crossbeams along the length direction interval of crossbeam to form a plurality of bar hole sites. The battery module comprises a plurality of battery cores and a plurality of partition plates, the battery cores are placed in a plurality of strip-shaped hole sites at intervals along the length direction of the longitudinal beam, and the partition plates are installed between every two adjacent battery cores. The upper shell component covers the upper part of the battery module and is fixedly connected with the lower shell. The power battery pack provided by the invention can completely fix the battery core, and when the power battery pack is laterally collided, the lower shell forms a first defense line, and the longitudinal beam forms a second defense line, so that the lateral collision prevention capability of the power battery pack can be greatly improved. In addition, the multiple longitudinal beams can also avoid short circuit in the battery cell caused by overlarge one-time deformation of the power battery pack, so that the service life of the power battery pack is comprehensively prolonged.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a power battery pack.
Background
Traditional new forms of energy power battery's battery package, its structure is: a power battery is by many electric cores series-parallel connection and constitutes, be connected through welding electricity connecting part between electric core and the electric core, electric connecting part welds with the homopolar of a plurality of electric cores and realizes parallelly connected formation a cluster, parallelly connected section is connected again and is formed the series connection with the parallelly connected electric core of a plurality of heteropolars, the section of a plurality of series connections forms a modular module, with the module outside the battery package volume equipment, then install the module into the battery package one by one again, this is the most extensive battery package group mode of current use.
In order to reduce the process steps of battery pack assembly and reduce the processing cost, a non-modular battery pack structure is developed. The structure of the non-modular battery pack is that a square battery core is directly placed in an upper cover and a lower shell of a box body, and then the battery core is compressed in the battery pack through a wedge block. Through this kind of installation and fixed mode, the module equipment flow of square electric core outside the battery package is cancelled, directly packs electric core into the box, reducible technology step, reduction processing cost. However, the installation and fixing method cannot realize complete fixation of the battery cell, when the vehicle vibrates in the driving process, the battery cell deflects or jumps in the box body, and electrical connectors such as a current collecting plate and a flexible connection are torn, so that electrical connection is easy to fall off and short circuit, and power is suddenly stopped or the battery explodes in the driving process of the vehicle. In addition, the risk that the battery pack is subjected to side impact is not considered in the mounting and fixing mode, and when the battery cell is subjected to side impact, short circuit is easily caused inside the battery cell, so that battery explosion is caused.
Disclosure of Invention
The invention mainly aims to provide a power battery pack, and aims to solve the technical problem that the current battery pack cannot realize complete fixation of a battery core and impact buffering, so that the impact resistance of the battery pack is weak.
In order to achieve the above object, the present invention provides a power battery pack, including:
the lower shell is internally and fixedly provided with two cross beams and a plurality of longitudinal beams, the two cross beams are arranged at intervals, and the longitudinal beams are arranged between the two cross beams at intervals along the length direction of the cross beams so as to form a plurality of strip-shaped hole sites;
the battery module comprises a plurality of battery cells, a plurality of partition plates, a plurality of current collecting plates and a voltage collecting device, wherein the plurality of battery cells are arranged in the plurality of strip-shaped hole sites at intervals along the length direction of the longitudinal beam, and the partition plates are arranged between every two adjacent battery cells; the plurality of battery cores are electrically connected through the plurality of current collecting plates and are electrically connected with the voltage acquisition device; and the number of the first and second groups,
and the upper shell component covers the upper part of the battery module and is fixedly connected with the lower shell to limit the battery module to move up and down.
Optionally, the upper housing assembly comprises:
the pressure plate covers the battery cell and is fixedly connected with the longitudinal beam and the cross beam through bolts, and the current collecting plate and the voltage collecting device are mounted to the pressure plate;
the cover plate is arranged on the pressure plate and is fixedly connected with the pressure plate; and the number of the first and second groups,
and the upper shell is covered on the cover plate and is fixedly connected with the lower shell.
Optionally, the pressing plate is bent downwards corresponding to the longitudinal beam and the cross beam to form a lower step surface, so that when the pressing plate is covered on the battery cell, the lower step surface is in contact with the upper end surfaces of the longitudinal beam and the cross beam;
the upper end faces of the longitudinal beam and the cross beam are provided with upper mounting holes, and the lower step face is provided with lower mounting holes corresponding to the upper mounting holes, so that the pressing plate is fixedly connected with the longitudinal beam and the cross beam through bolts.
Optionally, a contact hole penetrates through the pressing plate corresponding to the positive and negative electrode joints of the battery cell, and the current collecting plate is mounted on the pressing plate and electrically connected with the battery cell through the contact hole;
and a plurality of pressing buckles are arranged on the pressure plate corresponding to the flow collecting plate at intervals along the circumferential direction of the flow collecting plate, so that the flow collecting plate is fixedly arranged on the pressure plate.
Optionally, two rows of the current collecting plates are arranged on the pressure plate in parallel corresponding to each strip-shaped hole site, and the two rows of the current collecting plates extend along the length direction of the strip-shaped hole sites;
two are listed as being provided with 2 parallelly between the current collector along the length direction extension of bar hole site spacing muscle, two spacing muscle forms the draw-in groove, voltage acquisition device install in the draw-in groove.
Optionally, a boss is convexly arranged at the bottom of the side wall of the longitudinal beam, and the battery cell is mounted to the upper end face of the boss; and/or the presence of a gas in the gas,
the partition plate is an elastic rubber pad; and/or the presence of a gas in the gas,
an insulating part is arranged between the battery cell and the longitudinal beam.
Optionally, the power battery pack further includes a cooling module and a transmission pipe, where the cooling module is disposed between the battery cell and the lower casing, and is communicated with the transmission pipe, and is used for cooling the battery cell when a vehicle runs.
Optionally, the cooling module is arranged in a flat plate shape, a hole is arranged at the position of the cooling module corresponding to the longitudinal beam in a penetrating manner, and the longitudinal beam is embedded in the hole;
the cooling module is provided with a pipeline interface which is communicated with the transmission pipe.
Optionally, the power battery pack further comprises a heat insulation plate arranged below the cooling module; and/or the presence of a gas in the gas,
the power battery pack further comprises a heat conducting pad arranged between the cooling module and the battery core.
Optionally, a ring beam is convexly arranged on the peripheries of the cross beam and the longitudinal beam in the lower shell, a slot is formed between the ring beam and the cross beam and between the ring beam and the longitudinal beam, and the transmission pipe is arranged along the length direction of the slot.
In the power battery pack disclosed by the technical scheme of the invention, a plurality of longitudinal beams are arranged between two cross beams at intervals along the length direction of the cross beams to form a plurality of strip-shaped hole sites, the battery cores are arranged in the strip-shaped hole sites at intervals along the length direction of the longitudinal beams, and a partition plate is arranged between every two adjacent battery cores. Therefore, through the matching of the cross beam, the longitudinal beam and the partition plate, the square battery cell can be restrained from moving along the length direction and the width direction of the battery cell. The upper cover body assembly is covered above the battery module and is fixedly connected with the lower cover body so as to restrain the battery cell from jumping along the height direction of the battery cell. Thereby realizing the complete fixation of the battery core. Meanwhile, when the power battery pack is impacted laterally, the longitudinal beam breaks through the lower shell to form a second defense line in the power battery pack, and the longitudinal beam separates a plurality of battery cores into a plurality of rows, so that the power battery pack is prevented from being deformed too much due to impact, the structural strength and the safety of the power battery pack are improved, and the anti-collision performance is best. The power battery pack provided by the invention can completely fix the battery core, when the power battery pack is laterally collided, the lower shell forms a first defense line, the longitudinal beams form a second defense line, the battery core is arranged along the length direction of the longitudinal beams, the lateral collision prevention capability of the power battery pack can be greatly improved, and the multiple longitudinal beams can prevent the power battery pack from being too large in one-time deformation amount, so that the short circuit in the battery core is caused, the battery explosion is caused, and the power battery pack provided by the invention has higher overall lateral collision prevention capability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a power battery pack provided in the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an exploded view of a portion of the power battery pack of FIG. 1;
FIG. 4 is a partial schematic view of a gland of the power cell pack of FIG. 1;
fig. 5 is a schematic view of the stringer and cooling module mounting of the power battery pack shown in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
51 | |
| 1 | |
52 | |
| 11 | |
53 | |
| 2 | |
54 | |
| 21 | |
55 | |
| 3 | |
56 | |
| 31 | Boss | 57 | |
| 32 | |
6 | |
| 41 | |
7 | |
| 42 | |
71 | |
| 43 | |
72 | |
| 44 | |
81 | |
| 45 | Insulating |
82 | |
| 5 | |
83 | Heat conducting pad |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that, if directional indications (such as upper, lower, left, right, front, rear, outer and inner … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The conventional non-modular battery pack cannot completely fix the battery cell 41, and when vibration is generated in the driving process of a vehicle, the battery cell 41 deviates or jumps in a box body, and electrical connection pieces such as a current collecting plate 42 and a flexible connection piece are torn, so that electrical connection falling and short circuit are easily caused; in addition, when the current non-modular battery pack is subjected to a side collision, the internal short circuit is easily caused by the damage of the internal battery cell 41, and battery explosion is caused. Therefore, the invention provides a power battery pack, and aims to solve the technical problem that the battery is easy to explode due to the fact that the conventional battery pack cannot realize complete fixation of a battery core 41 and buffer impact. Fig. 1 is a schematic diagram of a power battery pack provided by the present invention, and fig. 2 to 5 are detailed diagrams of the power battery pack shown in fig. 1.
As shown in fig. 1-2, the power battery pack provided by the embodiment of the invention comprises a lower housing 1, a battery module and an upper housing assembly. Wherein, fixed mounting has two crossbeams 2 and a plurality of longerons 3 in the casing 1 down, and two crossbeams 2 intervals set up, and a plurality of longerons 3 are arranged between two crossbeams 2 along the length direction interval of crossbeam 2 to form a plurality of bar hole sites. The battery module comprises a plurality of battery cells 41, a plurality of partition plates 44, a plurality of current collecting plates 42 and a voltage collecting device 43, wherein the plurality of battery cells 41 are arranged in a plurality of strip-shaped hole sites at intervals along the length direction of the longitudinal beam 3, and the partition plates 44 are arranged between every two adjacent battery cells 41; the plurality of battery cells 41 are electrically connected to the voltage acquisition device 43 through the plurality of current collecting plates 42. The upper shell component covers the upper part of the battery module and is fixedly connected with the lower shell 1 so as to limit the battery module to move up and down.
In the invention, a plurality of longitudinal beams 3 are arranged between two cross beams 2 at intervals along the length direction of the cross beams 2 to form a plurality of strip-shaped hole sites, the battery cells 41 are arranged in the strip-shaped hole sites at intervals along the length direction of the longitudinal beams 3, and a partition plate 44 is arranged between two adjacent battery cells 41. In this way, the cell 41 can be restrained from moving in the length and width directions thereof by the cooperation of the cross beam 2, the longitudinal beam 3 and the partition 44. The upper cover assembly covers the battery module and is fixedly connected to the lower case 1 to restrain the cell 41 from jumping in the height direction thereof. Thereby achieving complete fixation of the cell 41. Meanwhile, when the power battery pack is impacted laterally, the longitudinal beam 3 breaks through the lower shell 1 to form a second defense line in the power battery pack, and the longitudinal beam 3 divides the plurality of battery cells 41 into a plurality of rows, so that the power battery pack is prevented from being deformed too much due to impact, the structural strength and the safety of the power battery pack are improved, and the anti-collision performance is best. The power battery pack provided by the embodiment of the invention can completely fix the battery cell 41, when the power battery pack is laterally collided, the lower shell 1 forms a first defense line, the longitudinal beam 3 forms a second defense line, the battery cell 41 is arranged along the length direction of the longitudinal beam 3, the lateral collision prevention capability of the power battery pack can be greatly improved, and the plurality of longitudinal beams 3 can also avoid overlarge one-time deformation of the power battery pack, so that the battery cell 41 is internally short-circuited to cause battery explosion, and the power battery pack provided by the embodiment of the invention has higher overall lateral collision prevention capability. In addition, this kind of electric core 41 arrangement mode makes the interior working of plastics of power battery package and sheet metal component's kind and quantity all reduce, and die sinking cost and material cost all reduce, conveniently disassemble, and cost of maintenance is low, has improved electric automobile's market competition.
With further reference to fig. 2 and 3, the upper housing assembly specifically includes a pressure plate 5, a cover plate 6, and an upper housing (not shown). The pressing plate 5 is covered on the battery cell 41 and is tightly connected with the longitudinal beam 3 and the cross beam 2 through bolts, so that the battery cell 41 is restrained in the height direction. A current collecting plate 42 and a voltage collecting device 43 are mounted to the pressure plate 5. The cover plate 6 is arranged on the pressure plate 5 and fixedly connected with the pressure plate 5 for protecting the current collecting plate 42 and the voltage collecting device 43. The upper shell is covered on the cover plate 6 and is fixedly connected with the lower shell 1, so that a first protection line of the power battery pack is formed.
It should be noted that the fixed connection mode of the cover plate 6 and the pressure plate 5 is not limited, and may be a bolt fastening connection, or in this embodiment, the cover plate 6 is buckled on the pressure plate 5 by a buckle. The fixed connection mode of the upper shell and the lower shell 1 is not limited, and the upper shell and the lower shell can be buckled through buckles or can be fastened and connected through bolts.
The pressing plate 5 is the most important structure for realizing the height direction constraint of the battery cell 41, and in order to sufficiently constrain the battery cell 41, the pressing plate 5 of the embodiment of the present invention is bent downward at the positions corresponding to the longitudinal beam 3 and the cross beam 2 to form the lower step surface 52, so that when the pressing plate 5 is covered on the battery cell 41, the lower step surface 52 can be in contact with the upper end surfaces of the longitudinal beam 3 and the cross beam 2. The upper end surfaces of the longitudinal beam 3 and the cross beam 2 are provided with upper mounting holes 51, the lower step surface 52 is provided with lower mounting holes 32 corresponding to the upper mounting holes 51, and the pressure plate 5 is fixedly connected with the longitudinal beam 3 and the cross beam 2 through bolts. It should be noted that, not only the periphery of the pressing plate 5 is bent downward to form the lower step surface 52, but also the lower step surface is fastened and connected with the longitudinal beams 3 and the cross beams 2 which are arranged around the battery cell 41 through bolts; furthermore, the middle part of the pressure plate 5 is bent downwards to form a groove corresponding to the position of the longitudinal beam 3, and the bottom surface of the groove forms a lower step surface 52 which is used for contacting with the upper end surface of the longitudinal beam 3 and is fastened and connected through a bolt.
It should be noted that the form of fixedly mounting the cross member 2 and the longitudinal member 3 to the lower case 1 is not limited, and may be welded or bolted. In the embodiment of the present invention, the cross member 2 and the longitudinal member 3 are fixed to the lower case 1 by bolt fastening. In specific implementation, lower connecting holes are formed in the lower end surfaces of the longitudinal beam 3 and the transverse beam 2 corresponding to the upper mounting holes 51, and upper connecting holes are formed in the lower shell 1 corresponding to the lower connecting holes. Bolts sequentially pass through the lower mounting holes 32 of the pressure plates 5, the upper mounting holes 51 of the longitudinal beams 3 and the cross beams 2, the lower connecting holes of the longitudinal beams 3 and the cross beams 2 and the upper connecting holes of the lower shell 1 from top to bottom, and are finally fixed to the lower shell 1. In addition, in order to meet the light requirement of the power battery pack, the structure in the power battery pack adopts an aluminum product, and because the aluminum product is soft, the reliability of directly tapping and fixing the bolt on the lower shell 1 is low, a steel thread sleeve is embedded in an upper connecting hole of the lower shell 1 so as to screw the bolt into the thread sleeve, and the pressing plate 5 is fastened and pressed on the battery cell 41.
Referring to fig. 2-4, the current collecting plate 42 and the voltage collecting device 43 are mounted to the pressure plate 5. Contact holes 53 are formed through the pressing plate 5 corresponding to the positive and negative electrode joints of the battery cell 41, and the current collecting plate 42 is installed on the pressing plate 5 and electrically connected with the battery cell 41 through the contact holes 53. Because the positive and negative electrodes of two adjacent cells 41 in the same strip-shaped hole site are arranged, and the positive and negative electrodes of two adjacent cells 41 of the current collecting plate 42 are connected in series, two rows of current collecting plates 42 are arranged in parallel at the position corresponding to each strip-shaped hole site on the pressure plate 5, and the two rows of current collecting plates 42 extend along the length direction of the strip-shaped hole site. A plurality of pressing buckles 54 are arranged on the pressure plate 5 at intervals along the circumferential direction of the collecting plate 42 at positions corresponding to the collecting plate 42, so that the collecting plate 42 is fixedly installed on the pressure plate 5. The number of the pressing buckles 54 is not limited, and in the embodiment of the present invention, 6 pressing buckles 54 are arranged at intervals along the circumferential direction of the collecting plate 42, wherein 2 pressing buckles are arranged along the length direction of the collecting plate 42, and 1 pressing buckle is arranged along the width direction.
2 limiting ribs 55 extending along the length direction of the strip-shaped hole sites are arranged between the two rows of the collecting plates 42 in parallel, the two limiting ribs 55 form a clamping groove 56, and the voltage acquisition device 43 is arranged in the clamping groove 56. Further, a notch is formed in the position, corresponding to the current collecting plate 42, of the limiting rib 55, the collecting end of the voltage collecting device 43 penetrates through the notch to be connected to the current collecting plate 42, and the notch is arranged to avoid the bending of the collecting end of the voltage collecting device 43, so that stress concentration is caused, and reliability is reduced. And an exhaust hole 57 is arranged at the clamping groove 56 on the pressing plate 5 and used for exhausting the battery cell 41.
In addition, the voltage acquisition device 43 in the embodiment of the present invention employs an FPC sampling line, energy generated when the battery cell 41 is exploded is very high, the vent hole 57 is easily melted by high temperature, and the FPC sampling line has high temperature resistance and can transmit fault information in enough time after the battery cell 41 is exploded.
In the current modularized-free power battery pack, the battery cell 41 is directly placed on the lower casing 1, all the weight of the battery cell 41 is borne on the lower casing 1, and the thickness of the lower casing 1 needs to be greatly increased to improve the anti-vibration strength of the power battery pack, which will greatly increase the weight and cost of the battery. For this purpose, in the embodiment of the present invention, the bottom of the side wall of the longitudinal beam 3 is convexly provided with the boss 31, and the battery cell 41 is mounted to the upper end surface of the boss 31. The boss 31 can bear all the weight of the battery cell 41, the weight of the battery cell 41 is completely borne on the longitudinal beam 3, a buffer space is formed between the battery cell 41 and the lower shell 1, and the vibration resistance of the power battery pack can be improved. In addition, the provision of the bosses 31 on the side members 3 can significantly reduce the weight of the battery and reduce the cost, as compared with the case 1 having a larger thickness. In addition, a cooling module 7 can be arranged in the buffer hole to reduce the temperature of the battery cell 41 during operation.
Further, an insulating member is provided between the cell 41 and the side member 3. Specifically, the contact part between the longitudinal beam 3 and the battery cell 41 is provided with insulating paper for blocking, so that short circuit caused by abrasion between the battery cell 41 and the longitudinal beam 3 can be avoided.
The partition plate 44 between two adjacent battery cells 41 in the same strip-shaped hole is an elastic rubber pad. By using the elasticity of the elastic rubber pad, the normal bulging of the battery cell 41 can be limited, and a certain expansion space can be provided when the battery cell 41 is short-circuited externally, so that the purpose of prolonging the service life of the battery cell 41 is achieved.
The performance, service life and safety of the power battery are always the working difficulties of the electric automobile industry, and the performance, service life and safety of the power battery are directly influenced by the working temperature of the power battery. When the temperature is too low, the output capacity of the battery is greatly reduced; when the temperature of the battery is excessively high, the battery is easily exploded to cause fire. The current modularized-free power battery pack has no cooling and heating measures, so that the service performance of the battery cell 41 is reduced, and the service life is short. For this reason, the power battery pack provided in the embodiment of the present invention further includes a cooling module 7 and a transmission pipe 81, referring to fig. 3, the cooling module 7 is disposed between the battery cell 41 and the lower housing 1, and is communicated with the transmission pipe 81, and can heat, cool or preserve heat of the battery cell 41. When the ambient temperature is too low, the cooling module 7 can heat the battery cell 41 to increase the working temperature of the battery cell 41, and when the temperature of the battery cell 41 is too high, the temperature of the battery cell 41 can be reduced to avoid thermal runaway of the battery cell 41, so that the safety performance of the battery cell 41, the output power of the battery cell 41 and the service life are improved.
It should be noted that the specific form of the cooling module 7 is not limited, and may be a cooling pipe wound in a serpentine shape, or may be a plurality of cooling plates arranged in a hollow manner and communicated with each other. In this embodiment, referring to fig. 5, the cooling module 7 is in a shape of a whole flat plate, and the flat plate-shaped cooling module 7 is hollow for introducing the cooling liquid. The cooling module 7 is provided with hole sites corresponding to the longitudinal beams 3 in a penetrating manner, and the longitudinal beams 3 are embedded in the hole sites. The cooling module 7 has a smart form and structure, can effectively reduce the number of the pipeline interfaces 72, reduces the material cost, and is convenient to install and maintain. The cooling module 7 is provided with a pipe interface 72, and the pipe interface 72 is communicated with a transmission pipe 81.
It should be noted that the cooling liquid introduced into the cooling module 7 is not limited in the present invention, and may be water or a nonflammable organic solvent.
Further, the power battery pack further comprises a heat insulation plate 82 arranged below the cooling module 7. The insulation board 82 can obstruct the transmission of heat between the cooling module 7 and the lower shell 1, and improve the working efficiency of the cooling module 7. The installation mode of the heat insulation plates 82 is not limited, if the cooling module 7 is integrally arranged, through holes are arranged at positions corresponding to the longitudinal beams 3 in a penetrating mode, and the longitudinal beams 3 are embedded in the heat insulation plates 82, or as shown in the embodiment, the power battery pack comprises a plurality of heat insulation plates 82, and the heat insulation plates 82 are arranged in strip-shaped hole positions, so that the installation is convenient, a certain heat insulation plate 82 can be independently replaced, and the cost is reduced.
The power battery pack further comprises a heat conducting pad 83, which is arranged between the cooling module 7 and the battery cell 41. The thermal pad 83 may be in close contact with the cooling module 7 and the battery cell 41, improving cooling and heating efficiency. The installation mode of the heat conducting pads 83 is not limited, and the cooling module 7 can be integrally arranged, through holes are arranged at positions corresponding to the longitudinal beams 3 in a penetrating mode, the longitudinal beams 3 are embedded in the heat conducting pads 83, or as shown in the embodiment, the power battery pack comprises a plurality of heat conducting pads 83, and the plurality of heat conducting pads 83 are arranged in strip-shaped hole positions, so that the power battery pack is convenient to install, and a certain heat conducting pad 83 can be independently replaced, and the cost is reduced. It should be noted that the material of the thermal pad 83 is not limited in the present invention, and preferably, the thermal pad 83 is made of a thermal conductive adhesive without an adhesive property, so that the battery can be conveniently maintained and disassembled.
Usually, the space in the power battery pack is limited, the transmission pipe 81 can only run along the side surface and wind around the rear part of the power battery pack, when the side surface of the power battery pack is impacted laterally, the transmission pipe 81 is easily damaged, and the cooling liquid leaks, so that the inside of the power battery pack is short-circuited. In the embodiment of the invention, the lower shell 1 is convexly provided with the ring beam 11 at the peripheries of the cross beam 2 and the longitudinal beam 3, a slot is formed between the ring beam 11 and the cross beam 2 and the longitudinal beam 3, and the transmission pipe 81 is arranged along the length direction of the slot. The design of trench can save the coolant liquid of revealing, avoids the coolant liquid to stretch, and simultaneously, the structural strength of ring roof beam 11 is high, can form first defence line when the vehicle receives the side impact, protection transmission pipe 81 and electric core 41. Of course, the installation form of the transmission pipe 81 is not limited to this, as long as the transmission pipe can be transmitted to the outside of the power battery pack, is convenient to install, has less bending and is not easy to be impacted.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A power battery pack, comprising:
the lower shell is internally and fixedly provided with two cross beams and a plurality of longitudinal beams, the two cross beams are arranged at intervals, and the longitudinal beams are arranged between the two cross beams at intervals along the length direction of the cross beams so as to form a plurality of strip-shaped hole sites;
the battery module comprises a plurality of battery cells, a plurality of partition plates, a plurality of current collecting plates and a voltage collecting device, wherein the plurality of battery cells are arranged in the plurality of strip-shaped hole sites at intervals along the length direction of the longitudinal beam, and the partition plates are arranged between every two adjacent battery cells; the plurality of battery cores are electrically connected through the plurality of current collecting plates and are electrically connected with the voltage acquisition device; and the number of the first and second groups,
and the upper shell component covers the upper part of the battery module and is fixedly connected with the lower shell to limit the battery module to move up and down.
2. The power battery pack of claim 1, wherein the upper housing assembly comprises:
the pressure plate covers the battery cell and is fixedly connected with the longitudinal beam and the cross beam through bolts, and the current collecting plate and the voltage collecting device are mounted to the pressure plate;
the cover plate is arranged on the pressure plate and is fixedly connected with the pressure plate; and the number of the first and second groups,
and the upper shell is covered on the cover plate and is fixedly connected with the lower shell.
3. The power battery pack according to claim 2, wherein the pressing plate is bent downward corresponding to the longitudinal beam and the cross beam to form a lower step surface, so that when the pressing plate cover is arranged on the battery cell, the lower step surface is in contact with the upper end surfaces of the longitudinal beam and the cross beam;
the upper end faces of the longitudinal beam and the cross beam are provided with upper mounting holes, and the lower step face is provided with lower mounting holes corresponding to the upper mounting holes, so that the pressing plate is fixedly connected with the longitudinal beam and the cross beam through bolts.
4. The power battery pack according to claim 3, wherein contact holes are formed through the pressure plate corresponding to the positive and negative electrode tabs of the battery cell, and the current collecting plate is mounted on the pressure plate and electrically connected to the battery cell through the contact holes;
and a plurality of pressing buckles are arranged on the pressure plate corresponding to the flow collecting plate at intervals along the circumferential direction of the flow collecting plate, so that the flow collecting plate is fixedly arranged on the pressure plate.
5. The power battery pack according to claim 4, wherein two rows of the current collecting plates are arranged in parallel on the pressure plate corresponding to each strip-shaped hole site, and the two rows of the current collecting plates extend along the length direction of the strip-shaped hole sites;
two are listed as being provided with 2 parallelly between the current collector along the length direction extension of bar hole site spacing muscle, two spacing muscle forms the draw-in groove, voltage acquisition device install in the draw-in groove.
6. The power battery pack as claimed in claim 1, wherein a boss is convexly arranged at the bottom of the side wall of the longitudinal beam, and the battery cell is mounted to the upper end face of the boss; and/or the presence of a gas in the gas,
the partition plate is an elastic rubber pad; and/or the presence of a gas in the gas,
an insulating part is arranged between the battery cell and the longitudinal beam.
7. The power battery pack of claim 1, further comprising a cooling module and a transmission pipe, wherein the cooling module is disposed between the battery cell and the lower casing and is in communication with the transmission pipe, and is configured to cool the battery cell when a vehicle is running.
8. The power battery pack according to claim 7, wherein the cooling module is arranged in a flat plate shape, a hole is formed through the cooling module corresponding to the longitudinal beam, and the longitudinal beam is embedded in the hole;
the cooling module is provided with a pipeline interface which is communicated with the transmission pipe.
9. The power battery pack according to claim 8, further comprising a heat insulation plate disposed below the cooling module; and/or the presence of a gas in the gas,
the power battery pack further comprises a heat conducting pad arranged between the cooling module and the battery core.
10. The power battery pack as claimed in claim 9, wherein a ring beam is convexly provided at the peripheries of the cross beam and the longitudinal beam in the lower case, a slot is formed between the ring beam and the cross beam and between the ring beam and the longitudinal beam, and the transmission pipe is arranged along the length direction of the slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911231308.6A CN110911604B (en) | 2019-12-03 | 2019-12-03 | Power battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911231308.6A CN110911604B (en) | 2019-12-03 | 2019-12-03 | Power battery pack |
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| CN110911604A true CN110911604A (en) | 2020-03-24 |
| CN110911604B CN110911604B (en) | 2021-06-08 |
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| CN201911231308.6A Active CN110911604B (en) | 2019-12-03 | 2019-12-03 | Power battery pack |
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| CN113782890A (en) * | 2020-05-22 | 2021-12-10 | 比亚迪股份有限公司 | Battery pack and electric vehicle |
| CN113782899A (en) * | 2020-05-22 | 2021-12-10 | 比亚迪股份有限公司 | Battery pack shell, battery pack and electric vehicle |
| CN113921973A (en) * | 2020-06-24 | 2022-01-11 | 帝亚一维新能源汽车有限公司 | Partially-replaceable power battery pack shell, power battery and electric vehicle |
| WO2022220396A1 (en) * | 2021-04-13 | 2022-10-20 | 주식회사 엘지에너지솔루션 | Battery pack |
| EP4235910A1 (en) * | 2022-02-17 | 2023-08-30 | Hyundai Mobis Co., Ltd. | Battery module |
| CN116722293A (en) * | 2023-08-07 | 2023-09-08 | 上海汽车集团股份有限公司 | Battery pack assembly for vehicle |
| CN118645751A (en) * | 2024-08-13 | 2024-09-13 | 欣旺达动力科技股份有限公司 | Battery pack and electricity utilization device |
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