CN111446397A - Battery pack box and battery pack - Google Patents
Battery pack box and battery pack Download PDFInfo
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- CN111446397A CN111446397A CN202010339838.9A CN202010339838A CN111446397A CN 111446397 A CN111446397 A CN 111446397A CN 202010339838 A CN202010339838 A CN 202010339838A CN 111446397 A CN111446397 A CN 111446397A
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- liquid cooling
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/64—Constructional details of batteries specially adapted for electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/66—Arrangements of batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
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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
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a battery pack box and a battery pack, which belong to the field of lithium ion batteries and comprise a battery box body, wherein a plurality of independent cavities for mounting batteries are arranged in the battery box body; a groove is arranged between the adjacent cavities and is used as an electric connection reserved space between the battery packs; an exhaust passage is arranged in the battery box body and communicated with the cavity, and an explosion-proof valve is arranged at the discharge end of the exhaust passage. The invention cancels the structural component of the battery module level, realizes the direct construction of the battery pack system from the battery core level, simplifies the process, and can improve the battery grouping rate to more than 80 percent.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, relates to a lithium ion battery of a new energy automobile, and particularly relates to a battery pack box and a battery pack.
Background
Along with the development of new energy industry technology, the demand of electric automobile terminal customer changes to high security, high travelling mileage demand gradually, so also higher and higher to the technical requirement of battery package, and the energy density of battery package promotes gradually, and the measure of promoting the energy density of battery package system mainly has two ways, reduces the weight of battery package system on the one hand, promotes the carrying electric quantity of battery package system on the other hand.
The prior art has the following disadvantages:
the existing battery pack system is formed by assembling a plurality of battery modules, the battery modules are divided into standard modules and non-standard modules and are composed of batteries, heat insulation materials, end plates, a shell, insulation pieces, busbars, sampling wire harnesses and insulation materials, the weight of module level structural parts is large, the grouping rate of the system is low (60% -70%), and the system energy density of the batteries is low;
the conventional battery pack consists of a plurality of modules, each module needs more than or equal to 4 fasteners/non-standard through nails to be assembled in a battery system, and the fasteners/non-standard through nails not only increase the complexity of the assembly process of the battery system, but also have higher cost and weight;
the conventional battery pack liquid cooling system is assembled in a battery system or at the bottom of a box body (a sandwich structure), so that the assembling and grouping process is complex, the cost is high, and the service life is short; the split type liquid cooling plates installed in the existing battery system are connected by virtue of pipelines, so that a large amount of internal space is occupied, the space utilization rate of the battery system is reduced, the risk of liquid leakage exists, and the safety is low;
the existing battery pack is only provided with one or more explosion-proof vent valves in the system, and the uncertainty of internal exhaust after thermal runaway of the battery system is not considered.
Disclosure of Invention
The invention aims to provide a battery pack box and a battery pack, which cancel a structural component of a battery module level, realize the direct construction of a battery pack system from a battery core level, simplify the process and improve the battery grouping rate to over 80 percent.
In order to solve the technical problems, the invention adopts the technical scheme that: a battery pack box body comprises a battery box body, wherein a plurality of independent cavities for installing batteries are arranged in the battery box body, a liquid cooling inlet and a liquid cooling outlet are arranged on the side surface of the battery box body, and are communicated through a liquid cooling flow channel arranged in the battery box body, so that the interior of the battery box body is cooled;
a groove is arranged between the adjacent cavities and is used as an electric connection reserved space between the battery packs;
an exhaust passage is arranged in the battery box body and communicated with the cavity, and an explosion-proof valve is arranged at the discharge end of the exhaust passage.
Furthermore, a high-temperature-resistant insulating sheath is fixedly arranged in the groove.
Further, the battery box includes boundary beam, crossbeam and bottom plate, four sides frame structure is constituteed to the boundary beam, the crossbeam sets up in four sides frame structure's inside and keeps apart it into a plurality of independence the cavity, crossbeam and bottom plate are whole to be set up, the both sides of crossbeam are equipped with first exhaust hole, the exhaust hole sets up with exhaust passage intercommunication, the inboard of boundary beam is equipped with the second exhaust hole, the second exhaust hole with exhaust passage intercommunication sets up.
Furthermore, the recess sets up the both ends of crossbeam top, the both ends of crossbeam are equipped with the overlap joint boss, be equipped with the overlap joint recess on the boundary beam, the overlap joint boss inserts realize location and fixed connection between the two in the overlap joint recess, the up end of bottom plate is equipped with the heat-conducting layer, the lower terminal surface on floor is equipped with the armor layer.
Further, the liquid cooling runner is established in the bottom plate, the lower extreme of boundary beam is equipped with the fourth cavity, the liquid cooling runner with the fourth cavity intercommunication sets up, liquid cooling import and liquid cooling export all set up with the fourth cavity intercommunication, the liquid cooling medium is got into by the liquid cooling import and is discharged by the liquid cooling export after passing through the liquid cooling runner.
Furthermore, a first cavity, a second cavity and a third cavity are sequentially arranged in the boundary beam from top to bottom, and the first cavity is used as an avoidance space for fastening a sealing surface by using a bolt fastener or riveting a riveting nail; the second cavity is used as an exhaust channel, the explosion-proof valve is installed at the tail part of the side beam, and the third cavity is used as a lightening hole.
A battery pack, comprising: the above battery pack case structure is used.
Further, the battery piles up the direction and sets up with the liquid cooling runner is perpendicular, has the buffer layer between every battery and the battery, between per two batteries and the battery, between per four batteries and the battery, and the group battery is constituteed to a plurality of batteries, by first backup pad in the middle of the group battery, and the centre gripping is carried out by the second backup pad on both sides, has fixed through-hole in first backup pad and second backup pad design.
Further, after the batteries are stacked, the serial connection and the parallel connection of the battery anode and cathode lugs and the connection of the single acquisition wire harness or the flexible acquisition wire are fixedly connected in a welding mode, a riveting mode or a bolting mode, the welding mode comprises laser welding or ultrasonic welding, and after the batteries are stacked, the batteries are filled and fixed by adopting heat conduction structural adhesive.
Furthermore, the upper end of each battery pack is provided with a heat insulation layer, the glue filling holes are formed in the fixing pieces, the fixing pieces are arranged on two sides of each battery pack and perpendicular to the first supporting plate, and sealing pieces are arranged on the sealing surfaces around the battery box body and form a closed space with the upper cover.
Compared with the prior art, the invention has the following advantages and positive effects.
1. The invention cancels the structural component of the module level, adopts the structure of battery stacking and battery packing, and the batteries are directly grouped into the battery pack system, thereby simplifying the process, having high battery grouping rate which can reach more than 80 percent and high energy density; part of structural parts and fasteners are eliminated, the number of system parts is reduced, and the cost is reduced;
2. the battery box body is integrally designed, so that the space utilization rate of a battery system is improved, dry-wet separation can be realized, the sealing performance is good, the safety is higher, and meanwhile, the bottom plate is used as a liquid cooling plate, so that the heat transfer path is simplified, the thermal resistance is low, the heat exchange efficiency is higher, and the manufacturing cost is lower;
3. due to the design of the thermal runaway exhaust channel, high-temperature and high-pressure gas in the battery pack after thermal runaway is quickly exhausted through the explosion-proof valve, explosion is prevented, the influence on a cab is delayed, and the safety of the battery pack is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is an exploded view of a battery pack according to the present invention;
FIG. 2 is a schematic view of the battery pack case of the present invention without the upper cover;
FIG. 3 is a cross-sectional view of the sill of the present invention;
FIG. 4 is a schematic structural view of the present invention edge beam;
FIG. 5 is a schematic structural view of the base plate of the present invention;
FIG. 6 is a schematic cross-sectional view of a base plate of the present invention;
FIG. 7 is a schematic view of the structure of the insulating sheath and mating parts of the present invention;
FIG. 8 is a schematic structural view of a liquid cooling flow passage of embodiment 1 of the present invention;
FIG. 9 is a schematic structural view of a liquid cooling flow passage of embodiment 2 of the present invention;
FIG. 10 is a schematic structural view of a liquid cooling flow passage of embodiment 3 of the present invention;
FIG. 11 is a schematic view of the structure of the exhaust passage of the present invention;
FIG. 12 is a schematic view of the liquid cooling outlet and associated components of the present invention;
FIG. 13 is a schematic view of a battery pack of the present invention without the upper cover;
fig. 14 is a schematic structural view of a battery pack according to the present invention.
Reference numerals:
10. a battery case; 11. a boundary beam; 111. a second vent hole; 112. a first cavity; 113. a second cavity; 114. a third cavity; 115. a fourth cavity; 116. a sealing surface; 117. overlapping the grooves; 118. a flow-collecting plug; 12. a cross beam; 121. a first exhaust port; 122. a groove; 1221. an insulating sheath; 123. lapping the bosses; 13. a base plate; 20. a cavity; 30. a liquid cooling inlet; 40. a liquid cooling outlet; 50. an upper cover; 60. a battery pack; 61. a first support plate; 62. a second support plate; 63. a fixing member; 631. filling glue holes; 64. a buffer layer; 65. an insulating layer; 70. a thermal insulation layer; 80. a seal member; 90. an exhaust passage; 91. a partition plate; 100. a liquid cooling flow passage; 110. an explosion-proof valve; 111. and (7) a plug.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
In this application, some industry terminology is explained as follows, group ratio: the weight of the battery core accounts for the weight percentage of the battery system; energy density: (total energy of system/total weight of system) 100%; space utilization rate: the volume of the battery core accounts for the volume percentage of the battery system.
As shown in fig. 1 to 14, a battery pack case and a battery pack include a battery pack case, which includes a battery case 10, a plurality of independent battery mounting cavities 20 are provided in the battery case 10, a liquid cooling inlet 30 and a liquid cooling outlet 40 are provided on a side surface of the battery case 10, the liquid cooling inlet 30 and the liquid cooling outlet 40 are communicated with each other through a liquid cooling flow channel 100 provided in the battery case 10 to cool the interior of the battery case 10, in this application, the number of the cavities 20 is four, and in the actual application process, the number of the cavities 20 may be 1, 2 or three, and other numbers, which are not specifically limited; the preferred aluminum alloy material of battery box 10, intensity is high, and weight is low, also can be other metal material, for example materials such as almag and titanium alloy, to different circumstances, the cost also need consider, sets for according to actual conditions, and boundary beam 11 and bottom plate 13 are through extrusion forming or cast molding technology integrated into one piece, adopt CNC to carry out the auxiliary processing.
The grooves 122 are arranged between the adjacent cavities 20 and are used as electric connection reserved spaces between the battery packs to enable the system to be more compact in grouping, preferably, high-temperature-resistant insulating sheaths 1221 are fixedly arranged in the grooves 122 to prevent the bus bars from being abraded and short-circuited, the insulating sheaths 1221 can be made of ceramic materials or other high-temperature-resistant materials, and after the battery packs are out of control due to heat, high-temperature gas damages insulating protective layers to cause the bus bars to be lapped with the box body, short-circuit faults occur and secondary accidents are caused, the structural shape of the insulating sheaths 1221 is not limited to the shape shown in the figure of the application and can be other shapes, and the insulating sheaths 1221 can be connected with the cross beams 12 through bolts or riveting or gluing or;
the battery case 10 is internally provided with an exhaust channel 90, the exhaust channel 90 is communicated with the cavity 20, the exhaust end of the exhaust channel 90 is provided with an explosion-proof valve 110, the explosion-proof valve 110 is arranged on a plug 111, the battery pack is provided with an upper cover 50, and a sealed cavity is formed with the battery case 10 through a sealing element.
Preferably, the battery box 10 includes an edge beam 11, a cross beam 12 and a bottom plate 13, the edge beam 11 constitutes a four-sided frame structure, the cross beam 12 is disposed inside the four-sided frame structure and separates the four-sided frame structure into a plurality of independent cavities 20, the cross beam 12 and the bottom plate 13 are integrally disposed, two sides of the cross beam 12 are provided with first exhaust holes 121, the exhaust holes are communicated with the exhaust passage 90, the inner side of the edge beam 11 is provided with second exhaust holes 111, the second exhaust holes 111 are communicated with the exhaust passage 90, the liquid cooling inlets 30 and the liquid cooling outlets 40 at two ends of the edge beam 11 are both provided with explosion-proof valves 110 mounting plugs 111, the plugging of the edge beam 11 and the sealing of the liquid cooling flow passage 100 are realized by welding through casting or CNC machining molding, and the welding process can be fusion welding, laser welding, brazing and the; the explosion-proof valve 110 is installed after welding, so that damage to the explosion-proof valve 110 caused by welding heat is avoided.
The upper cover 50 is made of metal material, preferably high-strength steel or steel material capable of being formed by deep drawing, or other metal material such as aluminum alloy, and the sealing bolts of the upper cover 50 are arranged as shown in fig. 14, so that the battery pack forms a plurality of cavities 20, and after the battery thermal runaway is prevented, high-temperature and high-pressure gas rapidly moves into other cavities to cause thermal runaway expansion, and the thermal runaway expansion has a certain delay effect on the thermal runaway expansion.
More preferably, bottom plate 13 and crossbeam 12 integrated into one piece, bottom plate 13 structure is not limited to the structure that this patent illustrates, crossbeam 12 position can be in bottom plate 13 middle, the left side, the design thinking is unanimous with this patent, do not make the redundant explanation, the integrated design has reduced the quantity of subassembly, box manufacturing process is more optimized, crossbeam 12's cross-section design has exhaust passage 90, crossbeam 12 positive and negative side design first exhaust hole 121, communicate with exhaust passage 90, be used for dealing with the harm that the exhaust direction uncertainty brought after the battery package thermal runaway, exhaust passage 90 is separated by baffle 91 in the middle of, prevent that battery chamber thermal runaway extension from influencing each other, holistic design thinking security is higher, as shown in fig. 5, fig. 6.
More preferably, the battery box body 10 is formed by welding a plurality of edge beams 11 and a plurality of bottom plates 13 in a splicing manner, and is not limited to two edge beams 11 and four bottom plates 13 illustrated in the patent, and other schemes are consistent in design thought with the patent and can be realized without redundant description; the internal welding efficiency is improved, the welding process is realized according to the realizability of the welding process, the fusion welding process is adopted, the welding process comprises MIG welding, CMT welding and the like, but the welding process is not limited to two types of welding, sealing structure glue is coated on an internal welding seam after welding, the sealing performance of the whole battery box body 10 is ensured, internal water seepage of a battery pack in a service period is prevented, insulation faults occur, a positioning boss is designed at the exhaust channel 90 of the bottom plate 13, a corresponding positioning groove 122 is designed at the edge beam 11, the sealing structure glue is coated on the positioning boss for matching, as shown in figure 11, the positioning boss is designed to enable the battery box body 10 to be accurately positioned in the assembling process, the process errors are reduced, all other assembling positions are overlapped by using concave-convex structures, the assembling positions comprise the bottom plate 13 and the bottom plate 13, and the bottom plate 13 and the edge beam 11, and.
Preferably, recess 122 sets up the both ends in crossbeam 12 top, the both ends of crossbeam 12 are equipped with overlap joint boss 123, be equipped with overlap joint recess 117 on the boundary beam 11, overlap joint boss 123 inserts realizes location and fixed connection of the two in the overlap joint recess 117, the simple structure of this kind of pin-connected panel, realization that can be quick is assembled, the structure that sets up moreover can be timely adjusts and sets for, the installation of bolt has been reduced, the weight of whole structure has been alleviateed, battery percentage in groups has been promoted greatly.
The up end of bottom plate 13 is equipped with the heat-conducting layer, the heat-conducting layer can be heat-conducting pad or heat conduction structure glue, thermal insulation material is pasted to each cavity 20 four walls of battery package, prevent that battery package thermal runaway back, inside high temperature high-pressure gas makes boundary beam 11 or crossbeam 12 lose efficacy in advance, and lead to thermal runaway extension or spout naked light to the battery package outside in advance, the heat-conducting layer can be the mica sheet, aerogel material, cross cutting or mould pressing become boundary beam 11 or crossbeam 12 along with the shape structure, the design of weakening is done to exhaust vent, be convenient for the directional eruption of thermal runaway back gas.
The lower end face of the bottom plate is provided with an armor layer which can be made of PVC (polyvinyl chloride) materials or polyurea materials, and the armor layer has the effects of buffering and resisting stone impact and preventing road surface stones from splashing to the bottom of the battery pack to damage the battery pack; the second function is heat insulation, so that the heat loss of the liquid cooling system to the bottom surface of the battery pack is reduced, and the heat exchange efficiency of the battery pack is improved; and the third function is corrosion prevention, so that the battery pack box body is prevented from being quickly corroded, and the service life of the battery pack is prolonged.
Preferably, the liquid cooling runner 100 is disposed in the bottom plate 13, the lower end of the side beam 11 is provided with a fourth cavity 115, the liquid cooling runner 100 is communicated with the fourth cavity 115, the liquid cooling inlet 30 and the liquid cooling outlet 40 are both communicated with the fourth cavity 115, a liquid cooling medium enters from the liquid cooling inlet 30 and is discharged from the liquid cooling outlet 40 after passing through the liquid cooling runner 100, the liquid cooling runner 100 is a liquid cooling runner 100, is not limited to the schematic cross-sectional shape of the patent and can be circular, rectangular, square, triangular or other polygonal shapes, the arrangement of the liquid cooling runner 100 forming a closed liquid cooling system liquid cooling runner 100 by matching with the liquid cooling inlet 30, the liquid cooling outlet 40 and the runner collecting plug 118 on the side beam 11 can be various types, the liquid cooling inlet 30 and the liquid cooling outlet 40 are disposed on both sides of the same end of the side beam 11, as shown in fig. 8, the liquid cooling inlet 30 enters into the fourth cavity 115 of the side beam 11, and then is, finally, the liquid is discharged through the liquid cooling outlet 40 of the side beam 11 on the other side, so that the laying area can be set as large as possible, and the cooling efficiency is improved; the structure shown in fig. 9 may be adopted, in which the liquid-cooling inlet 30 and the liquid-cooling outlet 40 are disposed at two sides of the same end of the boundary beam 11, enter the fourth cavity 115 of the boundary beam 11 from the liquid-cooling inlet 30, go from the boundary beam 11 at one side to the boundary beam 11 at the other side, and finally exit from the liquid-cooling outlet 40; the structure shown in fig. 10 may also be configured, the liquid cooling inlet 30 and the liquid cooling outlet 40 are disposed on the same side of the same end of the side beam 11, and enter the fourth cavity 115 of the side beam 11 from the liquid cooling inlet 30, and then are disposed in an S-shaped circulation manner inside the bottom plate 13, at this time, the fourth cavity 115 is divided into two independent parts, one corresponding to the liquid cooling outlet 40 and one corresponding to the liquid cooling outlet 40 by the partition plate 91.
Preferably, the inside of the boundary beam 11 is sequentially provided with a first cavity 112, a second cavity 113 and a third cavity 114 from top to bottom, the first cavity 112 is convenient for opening a hole on the sealing surface 116 and is used as an avoiding space for the sealing surface 116 when being fastened by using a bolt fastener or riveted by using a rivet nail, the second cavity 113 is an exhaust passage 90, and an explosion-proof vent valve is installed at the tail part of the boundary beam 11. When a certain battery monomer or a plurality of battery monomers are out of control due to abuse of a battery system, a large amount of high-temperature and high-pressure gas is generated, if the high-temperature and high-pressure gas is discharged out of the battery system in time, the explosion phenomenon can be generated, in order to avoid explosion after the battery pack is out of control due to heat, or the gas generated by the battery pack enters a cab to harm personal safety, a plurality of vent holes are designed on a box body boundary beam 11 of the battery pack, in consideration of uncertainty of the exhaust direction of the out-of-control due to heat of the soft-package battery, vent holes are also designed on the side surface of a cross beam 12, the cross beam 12 is communicated with a vent channel 90 of the boundary beam 11, once the battery pack is out of control due to heat, the generated gas can reach an explosion valve 110 along the vent channel 90, when the pressure in the battery pack reaches the explosion pressure of the explosion valve 110, the explosion valve 110 starts to function, therefore, gas can be prevented from entering the cab, and the safety of the battery pack is improved; the third cavity 114 is a lightening hole, is not limited to the 1 cavity illustrated in the present application, and may be two or three cavities, and is designed according to a mechanical structure.
A battery pack, comprising: the battery pack box structure comprises a BDU, a battery pack disconnection Unit and a battery pack disconnection Unit are fully spliced, and the BDU is specially designed for the interior of a battery pack and is also one of high-voltage distribution boxes; BMS is an abbreviation of BATTERY management system (BATTERY MANAGEMENT SYSTEM) and is a link between a BATTERY and a user. Its main object is secondary battery, mainly just in order to improve the utilization ratio of battery, prevents that overcharge and overdischarge from appearing in the battery, can be used to electric automobile, storage battery car, robot, unmanned aerial vehicle etc..
Preferably, a plurality of battery packs are formed by stacking batteries and placed in the cavities 20 corresponding to the battery box bodies, or the batteries are directly stacked in the cavities 20 corresponding to the battery pack box bodies, so that a module grouping process of the battery pack is cancelled; preferably, the stacking direction of the batteries is as shown in fig. 1, the batteries are arranged perpendicular to the liquid cooling flow channel 100, the temperature difference of the system can be reduced, buffer layers 64 are designed between every two batteries, between every four batteries and between the batteries, the buffer layers 64 can be made of foam materials or other colloidal materials, the foam materials have a heat insulation effect and prevent the heat expansion between the batteries, and meanwhile, the buffer layers 64 have a certain compression amount and the resilience force can absorb the expansion of the batteries in the charging and discharging processes; the battery and the battery without the buffer layer 64 are provided with a certain area of adhesive to prevent the battery and the battery from moving in a staggered manner and pulling the battery tab to cause leakage.
Preferably, after the battery is stacked, the serial connection and the parallel connection of the positive and negative electrode tabs of the battery and the connection of the single acquisition wire harness or the flexible acquisition wire are connected and fixed in a welding, riveting or bolting mode, the welding includes laser welding or ultrasonic welding, the battery is filled with heat conduction structural adhesive after being stacked, the heat conduction structural adhesive is filled through an adhesive filling hole 631 in the fixing piece 63 by adhesive filling, so that the gaps between the electrode tabs of the battery pack 60 are completely filled with the heat conduction structural adhesive, the heat conduction structural adhesive flows around the battery, and mechanical connection is formed after curing, as shown in fig. 11, in the adhesive filling process, the clamping tool needs to keep certain clamping force, a buffer layer 64 inside the battery pack 60 is ensured to be compressed, resilience is formed, the deformation in the battery expansion process is absorbed, the capacity attenuation of the battery is delayed, and the service life of the battery pack is.
Preferably, the upper end of each battery pack 60 is provided with a heat insulation layer 70 to prevent the external environment from causing heat influence on the battery pack 60, reduce the temperature difference of the system, and simultaneously slow down the speed of influence on the cockpit after the battery pack is out of control due to heat, so as to provide enough escape time for passengers, the periphery of the upper cover 50 is provided with a sealing element 80 which can be a sealing gasket, sealant or foaming material, preferably Hodges HT800 sealing foam, so that the high temperature resistance and aging resistance are good, the sealing element 80 can be prevented from being preferentially disabled after the battery pack is out of control due to heat, open fire is sprayed out from the sealing surface 116, and the safety is higher.
In the process of actual use, the battery pack 60 is formed by arranging a plurality of batteries in parallel, the battery pack 60 is matched with the battery box bodies 10, the boundary beam 11 and the cross beam 12 between the battery box bodies 10 adopt the structure of the lap joint groove 117 and the lap joint bulge, the use of fixing pieces 63 such as bolts is saved, the weight of the whole structure is greatly reduced, the grouping rate is improved, the lap joint assembly is more convenient and faster, the work efficiency is improved, the design thought of a battery isolation cavity is realized, the expansion of the batteries is easier, the positioning of the batteries is facilitated, the arrangement of the insulating sheath 1221 improves the safety of the whole structure, the arrangement of the glue filling consistency improves the sealing property of the whole structure, the arrangement of the thermal runaway prevention exhaust channel 90 improves the safety of the whole structure, and the cooling effect of the whole system is good, the safety of the structure is further improved.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a battery package box which characterized in that: the battery box comprises a battery box body, wherein a plurality of independent cavities for installing batteries are arranged in the battery box body, a liquid cooling inlet and a liquid cooling outlet are arranged on the side surface of the battery box body, and are communicated through a liquid cooling runner in the battery box body, so that the interior of the battery box body is cooled;
a groove is arranged between the adjacent cavities and is used as an electric connection reserved space between the battery packs;
an exhaust passage is arranged in the battery box body and communicated with the cavity, and an explosion-proof valve is arranged at the discharge end of the exhaust passage.
2. The battery pack case according to claim 1, wherein: and a high-temperature-resistant insulating sheath is fixedly arranged in the groove.
3. The battery pack case according to claim 1 or 2, characterized in that: the battery box body comprises boundary beams, cross beams and a bottom plate, the four-side frame structure is formed by the boundary beams, the cross beams are arranged in the four-side frame structure and isolated into a plurality of independent cavities, the cross beams and the bottom plate are integrally arranged, first exhaust holes are formed in the two sides of the cross beams and communicated with exhaust passages, second exhaust holes are formed in the inner sides of the boundary beams and communicated with the exhaust passages.
4. The battery pack case according to claim 3, wherein: the groove sets up the both ends of crossbeam top, the both ends of crossbeam are equipped with the overlap joint boss, be equipped with the overlap joint recess on the boundary beam, the overlap joint boss inserts realize location and fixed connection between the two in the overlap joint recess, the up end of bottom plate is equipped with the heat-conducting layer, the lower terminal surface on floor is equipped with the armor layer.
5. The battery pack case according to claim 3, wherein: the liquid cooling runner is arranged in the bottom plate, a fourth cavity is arranged at the lower end of the boundary beam, the liquid cooling runner is communicated with the fourth cavity, the liquid cooling inlet and the liquid cooling outlet are communicated with the fourth cavity, and liquid cooling media enter from the liquid cooling inlet and are discharged from the liquid cooling outlet after passing through the liquid cooling runner.
6. The battery pack case according to claim 3, wherein: a first cavity, a second cavity and a third cavity are sequentially arranged in the boundary beam from top to bottom, and the first cavity is used as an avoidance space when a sealing surface is fastened by using a bolt fastener or riveted by a riveting nail; the second cavity is used as an exhaust channel, the explosion-proof valve is installed at the tail part of the side beam, and the third cavity is used as a lightening hole.
7. A battery pack, comprising: use of a battery pack case according to any one of claims 1 to 6.
8. The battery pack according to claim 7, wherein: the battery piles up the direction and sets up perpendicularly with the liquid cooling runner, between every battery and the battery, between per two batteries and the battery, the design has the buffer layer between per four batteries and the battery, and group battery is constituteed to a plurality of batteries, by first backup pad in the middle of the group battery, the centre gripping is carried out by the second backup pad on both sides, has fixed through-hole in first backup pad and second backup pad design.
9. The battery pack case according to claim 7, wherein: after the batteries are stacked, the serial-parallel connection of the battery positive and negative lugs and the connection of the single acquisition wire harness or the flexible acquisition wire are fixedly connected in a welding, riveting or bolting mode, the welding comprises laser welding or ultrasonic welding, and the batteries are filled and fixed by adopting heat-conducting structural adhesive after the batteries are stacked.
10. The battery pack case according to claim 9, wherein: the upper end of every group battery all is equipped with the insulating layer, the encapsulating hole sets up on the mounting, the mounting sets up in the both sides of group battery, and the mounting sets up with first backup pad is perpendicular, is equipped with the sealing member on the sealing surface all around of battery box and forms airtight space with the upper cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339838.9A CN111446397A (en) | 2020-04-26 | 2020-04-26 | Battery pack box and battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339838.9A CN111446397A (en) | 2020-04-26 | 2020-04-26 | Battery pack box and battery pack |
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| CN111446397A true CN111446397A (en) | 2020-07-24 |
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| CN202010339838.9A Pending CN111446397A (en) | 2020-04-26 | 2020-04-26 | Battery pack box and battery pack |
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