CN109713396B - Power battery system structure of electric automobile - Google Patents
Power battery system structure of electric automobile Download PDFInfo
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- CN109713396B CN109713396B CN201811458786.6A CN201811458786A CN109713396B CN 109713396 B CN109713396 B CN 109713396B CN 201811458786 A CN201811458786 A CN 201811458786A CN 109713396 B CN109713396 B CN 109713396B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a power battery system structure of an electric automobile, which comprises: the cooling device comprises a first support, a second support, a water inlet and a water outlet, wherein a plurality of cooling liquid channels extending from the first support to the second support are arranged between the first support and the second support, at least one cooling liquid channel is communicated with the water inlet, at least one cooling liquid channel is communicated with the water outlet, a first support communicating liquid channel communicated with the cooling liquid channels is arranged in the first support, and a second support communicating liquid channel communicated with the cooling liquid channels is arranged in the second support; and flow deflectors are arranged in the first support communicated liquid channel and/or the second support communicated liquid channel, and flow guide holes are formed in the flow deflectors. The invention improves the cooling uniformity in each flow channel, improves the temperature uniformity of the battery module and prolongs the service life of the battery system.
Description
Technical Field
The invention relates to the related technical field of electric automobiles, in particular to a power battery system structure of an electric automobile.
Background
The market has the electric motor car of taking battery package temperature control system now, and it is general to design water-cooling pipeline or water-cooling board alone for the battery cooling.
The existing water cooling plate is provided with a plurality of parallel flow passages, however, no matter where the water inlet and outlet are arranged, the flow velocity and the flow rate of each flow passage are different due to the distance from the water inlet and outlet. Therefore, the cooling inside each flow channel has a large difference due to the uneven distribution of the flow velocity and the flow rate, so that the heat exchange effect between the flow channel and the battery module is affected, the temperature uniformity of the battery module is deteriorated, and the service life of the battery system is shortened.
Disclosure of Invention
In view of the above, it is necessary to provide a power battery system structure of an electric vehicle, which addresses the shortcomings in the prior art.
The invention provides a power battery system structure of an electric automobile, which comprises: the cooling device comprises a first support, a second support, a water inlet and a water outlet, wherein a plurality of cooling liquid channels extending from the first support to the second support are arranged between the first support and the second support, at least one cooling liquid channel is communicated with the water inlet, at least one cooling liquid channel is communicated with the water outlet, a first support communicating liquid channel communicated with the cooling liquid channels is arranged in the first support, and a second support communicating liquid channel communicated with the cooling liquid channels is arranged in the second support;
and flow deflectors are arranged in the first support communicated liquid channel and/or the second support communicated liquid channel, and flow guide holes are formed in the flow deflectors.
Furthermore, the first support is parallel to the second support, an axis perpendicular to the first support and passing through the water inlet is taken as a datum line, and the area of the flow guide hole of the flow guide sheet far away from the datum line is smaller than that of the flow guide hole of the flow guide sheet close to the datum line.
Further:
the first support is provided with a slit, and the flow deflector is inserted into the slit and fixed in the first support communicated liquid channel; and/or
The second support is provided with a slot, and the flow deflector is inserted into the slot and fixed in the second support communication liquid channel.
Furthermore, the flow deflector is welded and fixed with the first support communicated liquid channel and/or the second support communicated liquid channel.
Further, the flow guide holes are circular holes or elliptical holes.
Further, the flow deflector is arranged between two adjacent cooling liquid channels.
Still further, the battery pack comprises a battery lower shell, the first support comprises a lower shell front support, the second support comprises a lower shell rear support, the water inlet comprises a lower shell water inlet, the water outlet comprises a lower shell water outlet, the coolant channel comprises a lower shell coolant channel extending from the lower shell front support to the lower shell rear support, the first support communicating liquid channel comprises a lower shell front support communicating liquid channel which is arranged in the lower shell front support and communicated with the lower shell coolant channel, and the second support communicating liquid channel comprises a lower shell rear support communicating liquid channel which is arranged in the lower shell rear support and communicated with the lower shell coolant channel;
the flow deflector is arranged in the lower shell front support communicating liquid channel and/or the lower shell rear support communicating liquid channel.
Still further, still including setting up inferior valve fore-stock intercommunication liquid way or inferior valve after-poppet intercommunication liquid is said and is said the interior closed partition plate of interior, inferior valve water inlet with inferior valve delivery port sets up respectively closed partition plate both sides.
Still further, the battery further comprises an upper battery support, the first support comprises an upper front support, the second support comprises an upper rear support, the water inlet comprises an upper water inlet, the water outlet comprises an upper water outlet, the coolant channel comprises an upper coolant channel extending from the upper front support to the upper rear support, the first support communication channel comprises an upper front support communication channel arranged in the upper front support and communicated with the upper coolant channel, the second support communication channel comprises an upper rear support communication channel arranged in the upper rear support and communicated with the upper coolant channel, and the upper coolant channel is communicated with the lower coolant channel;
the flow deflectors are arranged in the upper shell front support communicated liquid channel and/or the upper shell rear support communicated liquid channel.
Still further, still include set up in upper shell fore-stock intercommunication liquid channel or the last shell after-poppet intercommunication liquid channel in the closed partition, the upper shell water inlet with the upper shell delivery port sets up respectively closed partition both sides.
The flow velocity and the flow of the cooling liquid flowing through the flow deflector are adjusted through the flow guide holes in the flow deflector, so that the flow velocity and the flow of the cooling liquid channels on the two sides of the flow deflector are adjusted, the cooling uniformity in each flow channel is improved, the temperature uniformity of the battery module is improved, and the service life of a battery system is prolonged.
Drawings
Fig. 1 is a schematic structural view of a conventional water-cooling plate of a battery module;
fig. 2 is a schematic structural diagram of a lower case of a power battery of an electric vehicle according to an embodiment of the invention;
FIG. 3 is a transverse sectional view of a lower case of a power battery of an electric vehicle according to an embodiment of the invention;
FIG. 4 is a cross-sectional view of the coolant passages of the inner housing and lower housing of one embodiment of the present invention;
FIG. 5 is a cross-sectional view of the coolant passages of the inner housing and lower housing of one embodiment of the present invention;
FIG. 6 is a longitudinal sectional view of a lower case of a power battery of an electric vehicle according to an embodiment of the present invention;
FIG. 7 is an exploded view of the dashed line block diagram of FIG. 6;
fig. 8 is a schematic structural diagram of a power battery bracket of an electric vehicle according to an embodiment of the invention;
FIG. 9 is a cutaway view of an open cover of a power battery system of an electric vehicle in accordance with one embodiment of the present invention;
fig. 10 is a view illustrating the coupling of a lower case and a lower-layered battery module according to an embodiment of the present invention;
fig. 11 is a schematic view illustrating the combination of an upper battery holder and an upper battery module according to an embodiment of the present invention;
fig. 12 is a schematic view illustrating the connection between the upper holder and the lower case of the battery according to one embodiment of the present invention;
FIG. 13 is a schematic diagram of a cover closing structure of a power battery system of an electric vehicle according to an embodiment of the present invention;
FIG. 14 is a schematic diagram of a cover opening structure of a power battery system of an electric vehicle according to an embodiment of the present invention;
FIG. 15 is a cross-sectional side view of a power battery system of an electric vehicle with a cover opened according to an embodiment of the present invention;
FIG. 16 is a side cutaway perspective view of an electric vehicle power battery system door in accordance with one embodiment of the present disclosure;
FIG. 17 is a structural schematic view of a lower case of a power battery of an electric vehicle according to the present invention;
fig. 18 is a top view of a lower case of a power battery for an electric vehicle according to the present invention;
FIG. 19 is a cross-sectional view A-A of FIG. 17;
FIG. 20 is a schematic structural view of an upper bracket of a power battery of an electric vehicle according to the present invention;
FIG. 21 is a sectional perspective view of a rear bracket of a lower housing of an upper bracket of a power battery of an electric vehicle according to the present invention;
FIG. 22 is a cross-sectional front view of a rear bracket of a lower housing of an upper bracket of a power battery of an electric vehicle according to the present invention;
fig. 23 is a schematic structural view of an upper bracket of a power battery of an electric vehicle provided with a sealing partition plate according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 17 to 23, the power battery system structure of an electric vehicle according to the present invention includes: the cooling device comprises a first support 101, 201, a second support 102, 202, a water inlet 106, 208 and a water outlet 107, 209, wherein a plurality of cooling liquid channels 105, 203 extending from the first support 101, 201 to the second support 102, 202 are arranged between the first support 101, 201 and the second support 102, 202, at least one cooling liquid channel 105, 203 is communicated with the water inlet 106, 208, at least one cooling liquid channel 105, 203 is communicated with the water outlet 107, 209, a first support communicating liquid channel 112, 207 communicated with the cooling liquid channel 105, 203 is arranged in the first support 101, 201, and a second support communicating liquid channel 109, 206 communicated with the cooling liquid channel is arranged in the second support;
Specifically, the coolant channels 105 and 203 may be different coolant channels, and the positions of the water inlet and the water outlet are not limited. Fig. 18 shows that the water inlet 106 and the water outlet 107 are provided in the first frame 101, fig. 20 shows that the water inlet 208 is provided in the first frame 201 and the water outlet 209 is provided in the second frame 202, and fig. 23 shows that the water inlet 208 and the water outlet 209 are provided in the first frame 201, which are merely illustrated as examples. In practice, the water inlet and outlet may be provided at the same time in the first support, at the same time in the second support, one in the first support and the other in the second support, or both in the coolant channel.
The specific sizes and shapes of the flow deflectors 600 and the flow guiding holes 601 are designed according to flow field simulation analysis.
During manufacturing, flow field distribution of the temperature control system and flow velocity/flow difference between the cooling liquid channels 105 and 203 are determined according to flow field simulation analysis. The shape of the guide vane, as well as its position in the flow field, and the height of the insert within the flow manifold are then calculated from this.
The flow velocity and the flow of the cooling liquid flowing through the flow deflector are adjusted through the flow guide holes in the flow deflector, so that the flow velocity and the flow of the cooling liquid channels on the two sides of the flow deflector are adjusted, the cooling uniformity in each flow channel is improved, the temperature uniformity of the battery module is improved, and the service life of a battery system is prolonged.
In one embodiment, the first support 101, 201 is parallel to the second support 102, 202, and an axis perpendicular to the first support 101, 201 and passing through the water inlet 106, 208 is used as a reference line, and an area of the guide hole 601 of the guide vane 600 far away from the reference line is smaller than an area of the guide hole 601 of the guide vane 600 close to the reference line.
Specifically, since the water inlet 106, 208 may be disposed in various manners, the water inlet 106, 208 may be disposed on the first rack 101, 201, the second rack 102, 202, or one of the coolant passages 105, 203. However, wherever the water inlet 106, 208 is provided, the incoming water eventually needs to enter the respective cooling liquid channel 105, 203 through the first bracket communication liquid passage 112, 207 or the second bracket communication liquid passage 109, 206. Therefore, with the axis perpendicular to the first front brackets 101 and 201 and passing through the water inlets 106 and 208 as a reference line, the flow velocity of the cooling liquid in the cooling liquid channels 105 and 203 where the reference line is located or closest to the reference line is the fastest, and the flow velocity of the cooling liquid in the cooling liquid channels 105 and 203 far away from the reference line is slower, so that the flow velocity of the cooling liquid in the cooling liquid channels 105 and 203 far away from the reference line is increased by reducing the area of the flow guide holes 601 of the flow guide vanes 600 far away from the reference line, so that the flow velocities of the cooling liquid in all the cooling liquid channels 105 and 203 are relatively balanced.
In one embodiment:
a slit 602 is arranged on the first support 101, 201, and the flow deflector 600 is inserted into the slit 602 and fixed in the first support communicating liquid channel 112, 207; and/or
The second brackets 102 and 201 are provided with slits 602, and the guide vane 600 is inserted into the slits 602 and fixed in the second bracket communicating liquid passages 109 and 206.
The present embodiment facilitates the addition of the guide vane 600 by providing the slit 602 on the first bracket 101, 201 or the second bracket 102, 202.
In one embodiment, the baffle 600 is welded to the first bracket communication channels 112, 207 and/or the second bracket communication channels 109, 206.
In one embodiment, the flow guide holes 601 are circular holes or elliptical holes.
The flow guide holes 601 are circular holes or elliptical holes to facilitate the circulation of the cooling liquid.
In one embodiment, the flow deflector 600 is disposed between two adjacent cooling liquid channels 105, 203.
In this embodiment, the flow deflector 600 is disposed between two adjacent cooling liquid channels 105 and 203, so as to avoid the imbalance of the flow rates of the cooling liquids in the same cooling liquid channel 105 and 203.
As shown in fig. 17 to 19, in one embodiment, the battery lower case 100 is included, the first support includes a lower case front support 101, the second support includes a lower case rear support 102, the water inlet includes a lower case water inlet 106, the water outlet includes a lower case water outlet 107, the coolant channel includes a lower case coolant channel 105 extending from the lower case front support 101 to the lower case rear support 102, the first support communication channel includes a lower case front support communication channel 112 disposed in the lower case front support 101 and communicating with the lower case coolant channel 105, and the second support communication channel includes a lower case rear support communication channel 109 disposed in the lower case rear support 102 and communicating with the lower case coolant channel 105;
the baffle 600 is disposed in the lower shell front bracket communicating liquid passage 112 and/or the lower shell rear bracket communicating liquid passage 109.
In one embodiment, the device further comprises a closed partition 603 arranged in the lower shell front support communication liquid channel 112 or the lower shell rear support communication liquid channel 109, and the lower shell water inlet 106 and the lower shell water outlet 107 are respectively arranged on two sides of the closed partition 603.
This embodiment is through setting up sealed baffle 603, divide into water inlet group and play water group to a plurality of inferior valve coolant liquid passageways 105 to can be according to the water inlet group and the different water conservancy diversion piece of play water group design.
Wherein the lower shell coolant passage 105 may be integrated into the lower shell inner support 104 as shown in fig. 19.
In one embodiment, the battery upper bracket 200 is further included, the first bracket includes an upper shell front bracket 201, the second bracket includes an upper shell rear bracket 202, the water inlet includes an upper shell water inlet 208, the water outlet includes an upper shell water outlet 209, the coolant channel includes an upper shell coolant channel 203 extending from the upper shell front bracket 201 toward the upper shell rear bracket 202, the first bracket communication channel includes an upper shell front bracket communication channel 207 disposed in the upper shell front bracket 201 and communicating with the upper shell coolant channel 203, the second bracket communication channel includes an upper shell rear bracket communication channel 206 disposed in the upper shell rear bracket 202 and communicating with the upper shell coolant channel 203, and the upper shell coolant channel 203 communicates with the lower shell coolant channel 105;
the guide vane 600 is disposed in the upper case front bracket communication liquid channel 207 and/or the upper case rear bracket communication liquid channel 206.
In one embodiment, the device further comprises a closed partition 603 arranged in the upper shell front bracket communication liquid channel 207 or the upper shell rear bracket communication liquid channel 206, and the upper shell water inlet 208 and the upper shell water outlet 209 are respectively arranged on two sides of the closed partition 603.
This embodiment is through setting up sealed baffle 603, divide into water group and play water group to a plurality of epitheca coolant passage 203 to can be according to the water inlet group and the different water conservancy diversion piece of play water group design.
As a preferred embodiment of the present invention, as shown in fig. 17 to 23, a power battery system structure of an electric vehicle includes: battery lower casing 100 and battery upper bracket 200, wherein:
the battery lower case 100 includes: the cooling structure comprises a lower shell front support 101, a lower shell rear support 102, a lower shell water inlet 106 and a lower shell water outlet 107, wherein a plurality of lower shell cooling liquid channels 105 extending from the lower shell front support 101 to the lower shell rear support 102 are arranged between the lower shell front support 101 and the lower shell rear support 102, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water inlet 106, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water outlet 107, a lower shell front support communicating liquid channel 112 communicated with the lower shell cooling liquid channel 105 is arranged in the lower shell front support 101, and a lower shell rear support communicating liquid channel 109 communicated with the lower shell cooling liquid channel is arranged in the lower shell rear support;
the lower shell front bracket 101 and the lower shell rear bracket 102 are provided with slits 602, the flow deflector 600 is inserted into the slits 602 and is welded and fixed in the lower shell front bracket communicating liquid channel 112 and the lower shell rear bracket communicating liquid channel 109, and the flow deflector is provided with flow guiding holes 601;
a closed clapboard 603 is arranged in the lower shell rear bracket communicating liquid channel 109, and a lower shell water inlet 106 and a lower shell water outlet 107 are arranged on the lower shell front bracket 101 and are respectively arranged on two sides of the closed clapboard 603;
the battery upper bracket 200 includes: the cooling device comprises an upper shell front support 201, an upper shell rear support 202, an upper shell water inlet 208 and an upper shell water outlet 209, wherein a plurality of upper shell cooling liquid channels 203 extending from the upper shell front support 201 to the upper shell rear support 202 are arranged between the upper shell front support 201 and the upper shell rear support 202, at least one upper shell cooling liquid channel 203 is communicated with the upper shell water inlet 208, at least one upper shell cooling liquid channel 203 is communicated with the upper shell water outlet 209, an upper shell front support communicating liquid channel 207 communicated with the upper shell cooling liquid channel 203 is arranged in the upper shell front support 201, an upper shell rear support communicating liquid channel 206 communicated with the cooling liquid channel is arranged in the upper shell rear support, and the upper shell cooling liquid channel 203 is communicated with the lower shell cooling liquid channel 105 through the upper shell water inlet 208 and the upper shell water outlet 209;
a closed partition plate 603 is arranged in the upper shell front support communicating liquid channel 207, and an upper shell water inlet 208 and an upper shell water outlet 209 are arranged on the upper shell front support 201 and are respectively arranged on two sides of the closed partition plate 603;
the flow guide holes 601 are circular holes or elliptical holes.
Fig. 8 is a schematic structural diagram of a power battery bracket of an electric vehicle according to the present invention, including: a battery lower case 100, a battery upper holder 200 disposed above the battery lower case 100, wherein:
the battery lower case 100 includes: a lower shell front bracket 101, a lower shell rear bracket 102, two lower shell side brackets 103 arranged at two sides of the lower shell front bracket 101 and the lower shell rear bracket 102, a lower shell water inlet 106 and a lower shell water outlet 107, at least one hollow lower inner bracket 104 extending from the lower front bracket 101 to the lower rear bracket 102 is arranged in a space surrounded by the lower front bracket 101, the lower rear bracket 102 and the two lower side brackets 103, a lower cooling liquid channel 105 connected with the lower surface of the top plate of the lower inner bracket 104 is arranged in at least one lower inner bracket 104, the lower case coolant passage 105 extends from the lower case front bracket 101 toward the lower case rear bracket 102, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water inlet 106, and at least one lower shell cooling liquid channel 105 is communicated with the lower shell water outlet 107;
the battery upper holder 200 includes an upper case front holder 201, an upper case rear holder 202, and an upper case coolant passage 203 extending from the upper case front holder 201 toward the upper case rear holder 202, the upper case coolant passage 203 communicating with the lower case coolant passage 105.
Specifically, the lower shell inner support 104 and the lower shell cooling liquid channel 105 may be made of aluminum, and are integrally formed and processed by using an extrusion molding processing method, and the cost after the integral forming is lower than that in the prior art. The cooling function is realized while the mechanical strength of the lower case is enhanced. The combination of the lower shell inner support 104 and the lower shell coolant passage 105 is not limited. One lower shell inner support 104 may be provided with one or more lower shell coolant passages 105 in the lower shell inner support 104, or a plurality of lower shell inner supports 104 may be provided with one or more lower shell coolant passages 105 in each lower shell inner support 104. If only one lower case coolant passage 105 is provided, the front and rear ends of the lower case coolant passage 105 communicate with the lower case water inlet 106 and the lower case water outlet 107, respectively. If a plurality of lower shell cooling liquid channels 105 are arranged, the plurality of lower shell cooling liquid channels 105 are communicated, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water inlet 106, and at least one lower shell cooling liquid channel 105 is communicated with the lower shell water outlet 107. The arrangement positions of the lower shell water inlet 106 and the lower shell water outlet 107 are not limited. In fig. 2, the lower shell water inlet 106 and the lower shell water outlet 107 are provided in the lower shell front bracket 101 for illustration only. In practice, the lower shell water inlet 106 and the lower shell water outlet 107 may be provided at the lower shell front bracket 101 at the same time, at the lower shell rear bracket 102 at the same time, or one at the lower shell front bracket 101 and the other at the lower shell rear bracket 102.
The upper case coolant passage 203 of the battery upper holder 200 communicates with the lower case coolant passage 105. Coolant, e.g., water, enters from the lower housing water inlet 106, enters the lower housing coolant passage 105 and the upper housing coolant passage 203, the lower battery module is placed above the lower housing inner support 104, the upper battery module is placed above the upper housing coolant passage 203, the heat of the lower battery module is transferred to the lower housing coolant passage 105 through the top plate of the lower housing inner support 104, the coolant in the lower housing coolant passage 105 is taken away, the heat of the upper battery module is transferred to the upper housing coolant passage 203, the coolant is taken away by the terminal coolant of the upper housing coolant passage 203, the coolant flows out through the lower housing water outlet 107, and the heat is taken away.
According to the invention, the cooling liquid channel is integrated into the lower shell, the upper-layer module cooling junction is connected with the lower-layer water cooling structure through the connecting structure, the structural members are reduced, the reliability of the structure is improved, the number of assembly parts is reduced, the production beat of a factory is accelerated, and the part cost and the manufacturing cost are reduced. Meanwhile, the weight of the structural part is reduced, the energy density of the battery system is improved, the size of the battery pack in the height direction is reduced, and the riding comfort of the vehicle is improved.
In one embodiment, the battery upper bracket 200 further includes a bottom support structure 204 fixedly connected to the upper case front bracket 201 and the upper case rear bracket 202, and the upper case cooling fluid channel 203 is disposed on the bottom support structure 204.
The present embodiment provides a bottom support structure 204 to enhance the support of the battery top bracket 200.
As shown in FIG. 11, in one embodiment, the bottom support structure 204 includes a bottom rigid support structure 2041 and a flexible support structure 2042 disposed on the bottom rigid support structure 2041 supporting the upper housing coolant passage 203.
In this embodiment, the bottom rigid support structure 2041 is provided with the elastic support structure 2042 for supporting the upper case coolant passage 203, so that vibration is reduced, and the stability of the upper battery module is improved.
As shown in fig. 3 and 12, in one embodiment, the cooling device further includes upper and lower communication ducts 205 connected to the upper case rear bracket 202 and the lower case rear bracket 102, respectively, and the upper and lower communication ducts 205 are in communication with the upper case cooling liquid passage 203 and the lower case cooling liquid passage 105, respectively.
In this embodiment, the upper and lower layers of cooling liquid channels are connected by the upper and lower layer connecting pipes 205, so as to realize heat dissipation of the upper and lower layers.
In one embodiment, an upper case rear support communication liquid passage 206 is provided in the upper case rear support 202, the plurality of upper case cooling liquid passages 203 communicate with the upper case rear support communication liquid passage 206, and the upper ends of the upper and lower layer communication pipes 205 communicate with the upper case rear support communication liquid passage 206.
In one embodiment, the battery lower case 100 further includes a lower case rear holder communication liquid passage 109 provided in the lower case rear holder 102, the plurality of lower case cooling liquid passages 105 are communicated with the lower case rear holder communication liquid passage 109, and the lower ends of the upper and lower layer communication pipes 205 are communicated with the lower case rear holder communication liquid passage 109.
In one embodiment, an upper case front support communication liquid channel is provided in the upper case front support 201, and the plurality of upper case cooling liquid channels 203 are communicated with the upper case front support communication liquid channel.
In one embodiment, the upper shell coolant channel 203 is a tubular structure.
As shown in fig. 9, a cover opening section view of a power battery system of an electric vehicle according to the present invention includes: the electric vehicle power battery support, the lower battery module 300 disposed on the lower case inner support 104 of the electric vehicle power battery support, and the upper battery module 400 disposed on the upper case cooling liquid channel 203 of the electric vehicle power battery support as described above.
As shown in fig. 10 and 11, in one embodiment, a lower thermally conductive layer 301 disposed between the lower battery module 300 and the lower inner housing frame 104, and an upper thermally conductive layer 401 disposed between the upper battery module 400 and the upper housing coolant channel 203 are also included.
As a preferred embodiment of the present invention, as shown in fig. 2 to 16, a power battery system for an electric vehicle includes: the electric vehicle power battery support comprises an electric vehicle power battery support, a lower-layer battery module 300, an upper-layer battery module 400 and an upper cover 500;
electric automobile power battery support includes: a battery lower case 100, a battery upper holder 200 disposed above the battery lower case 100, wherein:
the battery lower case 100 includes: a lower shell front bracket 101, a lower shell rear bracket 102, two lower shell side brackets 103 arranged at two sides of the lower shell front bracket 101 and the lower shell rear bracket 102, a lower shell water inlet 106 and a lower shell water outlet 107, at least one hollow lower inner bracket 104 extending from the lower front bracket 101 to the lower rear bracket 102 is arranged in a space surrounded by the lower front bracket 101, the lower rear bracket 102 and the two lower side brackets 103, a lower cooling liquid channel 105 connected with the lower surface of the top plate of the lower inner bracket 104 is arranged in at least one lower inner bracket 104, the lower case coolant passage 105 extends from the lower case front bracket 101 toward the lower case rear bracket 102, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water inlet 106, and at least one lower shell cooling liquid channel 105 is communicated with the lower shell water outlet 107;
the upper battery support 200 comprises an upper front support 201, an upper rear support 202, an upper cooling liquid channel 203 of a tubular structure extending from the upper front support 201 to the upper rear support 202, and a bottom support structure 204 fixedly connected to the upper front support 201 and the upper rear support 202, wherein the upper cooling liquid channel 203 is disposed on the bottom support structure 204, the upper cooling liquid channel 203 is communicated with the lower cooling liquid channel 105, and the bottom support structure 204 comprises a bottom rigid support structure 2041 and an elastic support structure 2042 disposed on the bottom rigid support structure 2041 and supporting the upper cooling liquid channel 203;
still include respectively with upper shell after-poppet 202 and the upper and lower floor's communicating pipe 205 that inferior valve after-poppet 102 is connected, upper and lower floor's communicating pipe 205 respectively with upper shell coolant liquid passageway 203 and inferior valve coolant liquid passageway 105 intercommunication, be provided with upper shell after-poppet intercommunication liquid way 206 in upper shell after-poppet 202, it is a plurality of upper shell coolant liquid passageway 203 with upper shell after-poppet intercommunication liquid way 206 intercommunication, upper and lower floor's communicating pipe 205's upper end with upper shell after-poppet intercommunication liquid way 206 intercommunication, battery inferior valve 100 is still including setting up inferior valve after-poppet intercommunication liquid way 109 in inferior valve after-poppet 102, it is a plurality of inferior valve coolant liquid passageway 105 with inferior valve after-poppet intercommunication liquid way 109 intercommunication, the lower extreme of upper and lower floor's communicating pipe 205 with inferior valve after-poppet intercommunication liquid way 109 intercommunication
The lower-layer battery module 300 is arranged on the lower inner shell support 104 of the electric automobile power battery support, and the upper-layer battery module 400 is arranged on the upper shell cooling liquid channel 203 of the electric automobile power battery support;
the lower battery module 300 is provided with a service maintenance switch 301 and a high voltage control box 302.
The lower-layer module cooling structure and the battery pack lower shell are integrated, and the upper-layer module cooling junction is connected with the lower-layer water cooling structure through the connecting structure.
Fig. 2 is a schematic structural diagram of a lower case 100 of a power battery of an electric vehicle according to the present invention, which includes: a lower shell front bracket 101, a lower shell rear bracket 102, two lower shell side brackets 103 arranged at two sides of the lower shell front bracket 101 and the lower shell rear bracket 102, a lower shell water inlet 106 and a lower shell water outlet 107, at least one hollow lower inner bracket 104 extending from the lower front bracket 101 to the lower rear bracket 102 is arranged in a space surrounded by the lower front bracket 101, the lower rear bracket 102 and the two lower side brackets 103, a lower cooling liquid channel 105 connected with the lower surface of the top plate of the lower inner bracket 104 is arranged in at least one lower inner bracket 104, the lower case coolant passage 105 extends from the lower case front bracket 101 toward the lower case rear bracket 102, and at least one lower shell cooling liquid channel 105 is communicated with the lower shell water inlet 106, and at least one lower shell cooling liquid channel 105 is communicated with the lower shell water outlet 107.
Specifically, the lower shell inner support 104 and the lower shell cooling liquid channel 105 may be made of aluminum, and are integrally formed and processed by using an extrusion molding processing method, and the cost after the integral forming is lower than that in the prior art. The combination of the lower shell inner support 104 and the lower shell coolant passage 105 is not limited. One lower shell inner support 104 may be provided with one or more lower shell coolant passages 105 in the lower shell inner support 104, or a plurality of lower shell inner supports 104 may be provided with one or more lower shell coolant passages 105 in each lower shell inner support 104. If only one lower case coolant passage 105 is provided, the front and rear ends of the lower case coolant passage 105 communicate with the lower case water inlet 106 and the lower case water outlet 107, respectively. If a plurality of lower shell cooling liquid channels 105 are arranged, the plurality of lower shell cooling liquid channels 105 are communicated, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water inlet 106, and at least one lower shell cooling liquid channel 105 is communicated with the lower shell water outlet 107. The arrangement positions of the lower shell water inlet 106 and the lower shell water outlet 107 are not limited. In fig. 2, the lower shell water inlet 106 and the lower shell water outlet 107 are provided in the lower shell front bracket 101 for illustration only. In practice, the lower shell water inlet 106 and the lower shell water outlet 107 may be provided at the lower shell front bracket 101 at the same time, at the lower shell rear bracket 102 at the same time, or one at the lower shell front bracket 101 and the other at the lower shell rear bracket 102. Coolant, such as water, enters the lower case coolant passage 105 from the lower case water inlet 106, the battery module is placed above the lower case inner support 104, the heat of the battery module is transferred to the lower case coolant passage 105 through the top plate of the lower case inner support 104 and taken away by the coolant in the lower case coolant passage 105, and the coolant flows out through the lower case water outlet 107 and takes away the heat. A heat conducting layer may be disposed between the battery module and the top plate of the lower case inner bracket 104 for conducting heat.
The invention integrates the cooling liquid channel into the lower shell, reduces structural members, improves the reliability of the structure, reduces the number of assembling parts, is beneficial to accelerating the production rhythm of a factory and reducing the cost of the parts and the manufacturing cost. Meanwhile, the weight of the structural part is reduced, the energy density of the battery system is improved, the size of the battery pack in the height direction is reduced, and the riding comfort of the vehicle is improved.
As shown in fig. 4, in one embodiment, the cooling liquid channel 105 includes a connecting portion 1051 connected to the lower surface of the top plate of the lower shell inner bracket 104, and a main body portion 1052 connected to the connecting portion 1051, the connecting portion 1051 is communicated with the main body portion 1052, and the main body portion 1052 has a width larger than that of the connecting portion 1051.
Specifically, the width direction refers to an extending direction from one lower case side bracket 103 to the other lower case side bracket 103.
As shown in fig. 5, a predetermined gap is formed between the main body portion 1052 and the lower surface of the top plate of the lower shell inner bracket 104.
In one embodiment, the lower inner bracket 104 is provided with a lower reinforcing rib 108 extending from the lower front bracket 101 to the lower rear bracket 102.
The present embodiment adds reinforcing ribs 108 to improve the strength of the lower inner housing 104.
In one embodiment, the distance between the connecting portion 1051 and the lower case reinforcing rib 108 is greater than or equal to a first distance threshold.
Preferably, the first distance threshold is 10 millimeters.
The horizontal distance between the cooling liquid channel 105 and the lower shell reinforcing rib 108 is larger than or equal to the first distance threshold, so that the heat radiation and the heat conduction from the cooling liquid channel 105 to the lower surfaces of the lower shell reinforcing rib 108 and the lower shell inner support 104 are reduced, and the efficiency of the cooling system is improved.
In one embodiment, the distance between the main body portion 1052 and the bottom plate of the inferior shell inner bracket 104 is greater than or equal to a second distance threshold.
Preferably, the second distance threshold is 5 millimeters.
In the embodiment, the vertical distance between the cooling liquid channel 105 and the lower surface of the lower shell inner support 104 is larger than or equal to the second distance threshold, so that the heat radiation and the heat conduction from the cooling liquid channel 105 to the lower surface of the lower shell inner support 104 are reduced, the heat loss is reduced, and the efficiency of the cooling system is improved.
In one embodiment, a lower case rear bracket communication liquid passage 109 is provided in the lower case rear bracket 102, and the plurality of lower case cooling liquid passages 105 communicate with the lower case rear bracket communication liquid passage 109.
The present embodiment uses the inner chamber of the lower shell rear holder 102 as the lower shell rear holder communication liquid passage 109, thereby integrating the lower shell rear holder communication liquid passage 109 into the lower shell rear holder 102.
In one embodiment, as shown in fig. 6, the inferior valve inner support 104 is provided with an extension 1041 at the bottom of the end portion near the inferior valve rear support 102, the inferior valve rear support 102 is provided with a notch 1021 matching with the extension 1041 below the inferior valve rear support communication liquid channel 109, and the extension 1041 is inserted into the notch 1021.
Particularly, the lower shell structure is connected by adopting a block split welding structure and a mortise-tenon structure.
The inferior valve structure of this embodiment adopts mortise and tenon joint structural connection, except welded connection, mortise and tenon joint itself can the load, greatly increased the intensity at connection position.
In one embodiment, the lower shell inner bracket 104 and the lower shell rear bracket 102 are welded by a first welding point 1042 and a second welding point 1043, the first welding point 1042 is located at the contact surface of the extension 1041 and the notch 1021, and the second welding point 1043 is located at the contact surface of the top plate of the lower shell inner bracket 104 and the lower shell rear bracket 102.
The welding point of this embodiment has avoided the water course, has guaranteed the integrality of water course, avoids durable back risk of leaking water.
In one embodiment, a tailgate 110 coupled to the lower case rear bracket 102, and a vehicle body coupling structure 111 coupled to the lower case side bracket 103 are further included.
As a preferred embodiment of the present invention, as shown in fig. 2 to 7, a structural schematic diagram of a lower case 100 of a power battery of an electric vehicle includes: a lower shell front support 101, a lower shell rear support 102, two lower shell side supports 103 arranged at two sides of the lower shell front support 101 and the lower shell rear support 102, a lower shell water inlet 106, a lower shell water outlet 107, a rear baffle 110 connected with the lower shell rear support 102, and a vehicle body connecting structure 111 connected with the lower shell side supports 103, wherein at least one hollow lower shell inner support 104 extending from the lower shell front support 101 to the lower shell rear support 102 is arranged in a space surrounded by the lower shell front support 101, the lower shell rear support 102 and the two lower shell side supports 103, a lower shell cooling liquid channel 105 connected with the lower surface of the top plate of the lower shell inner support 104 is arranged in at least one lower shell inner support 104, the lower shell cooling liquid channel 105 extends from the lower shell front support 101 to the lower shell rear support 102, and a plurality of the lower shell cooling liquid channels 105 are communicated with each other, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water inlet 106, at least one lower shell cooling liquid channel 105 is communicated with the lower shell water outlet 107, a lower shell reinforcing rib 108 extending from the lower shell front support 101 to the lower shell rear support 102 is further arranged in the lower shell inner support 104, and the lower shell inner support 104 and the lower shell cooling liquid channel 105 are integrally formed by aluminum materials;
wherein the coolant passage 105 includes a connecting portion 1051 connected to the lower surface of the top plate of the under casing inner bracket 104, and a body portion 1052 connected to the connecting portion 1051, the connecting portion 1051 communicates with the body portion 1052, and the width of the body portion 1052 is greater than the width of the connecting portion 1051;
a rear lower shell support communicating liquid channel 109 is arranged in the rear lower shell support 102, the lower shell cooling liquid channels 105 are communicated with the rear lower shell support communicating liquid channel 109, an extending section 1041 is arranged at the bottom of the end portion, close to the rear lower shell support 102, of the inner lower shell support 104, a notch 1021 matched with the extending section 1041 is arranged below the rear lower shell support communicating liquid channel 109 of the rear lower shell support 102, the extending section 1041 is inserted into the notch 1021, the inner lower shell support 104 is welded with the rear lower shell support 102 through a first welding point 1042 and a second welding point 1043, the first welding point 1042 is located on a contact surface of the extending section 1041 and the notch 1021, and the second welding point 1043 is located on a contact surface of a top plate of the inner lower shell support 104 and the rear lower shell support 102.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The utility model provides an electric automobile power battery system structure which characterized in that includes: the cooling device comprises a first support (101, 201), a second support (102, 202), a water inlet (106, 208) and a water outlet (107, 209), wherein a plurality of cooling liquid channels (105, 203) extending from the first support (101, 201) to the second support (102, 202) are arranged between the first support (101, 201) and the second support (102, 202), at least one cooling liquid channel (105, 203) is communicated with the water inlet (106, 208), at least one cooling liquid channel (105, 203) is communicated with the water outlet (107, 209), a first support communicating liquid channel (112, 207) communicated with the cooling liquid channel (105, 203) is arranged in the first support (101, 201), and a second support communicating liquid channel (109, 206) communicated with the cooling liquid channel is arranged in the second support;
a flow deflector (600) is arranged in the first support communicating liquid channel (112, 207) and/or the second support communicating liquid channel (109, 206), and a flow guiding hole (601) is formed in the flow deflector;
the first support (101, 201) is parallel to the second support (102, 202), an axis which is perpendicular to the first support (101, 201) and passes through the water inlet (106, 208) is taken as a datum line, and the area of the flow guide hole (601) of the flow guide piece (600) far away from the datum line is smaller than that of the flow guide hole (601) of the flow guide piece (600) close to the datum line.
2. The electric vehicle power battery system structure of claim 1, wherein:
a slot (602) is formed in the first support (101, 201), and the flow deflector (600) is inserted into the slot (602) and fixed in the first support communicating liquid channel (112, 207); and/or
The second support (102, 201) is provided with a slot (602), and the guide vane (600) is inserted into the slot (602) and fixed in the second support communication liquid channel (109, 206).
3. The electric vehicle power battery system structure of claim 2, wherein the flow deflector (600) is welded to the first bracket communication fluid channel (112, 207) and/or the second bracket communication fluid channel (109, 206).
4. The electric vehicle power battery system structure according to claim 1, characterized in that the flow guide holes (601) are circular holes or elliptical holes.
5. The electric vehicle power battery system structure of claim 1, characterized in that the flow deflector (600) is arranged between two adjacent coolant channels (105, 203).
6. The electric vehicle power battery system structure according to any one of claims 1 to 5, characterized by comprising a battery lower case (100), the first cradle comprising a inferior shell anterior cradle (101), the second cradle comprising a inferior shell posterior cradle (102), the water inlet comprises a lower shell water inlet (106), the water outlet comprises a lower shell water outlet (107), the cooling liquid channel comprises a lower shell cooling liquid channel (105) extending from the lower shell front bracket (101) to the lower shell rear bracket (102), the first bracket communicating liquid channel comprises a lower shell front bracket communicating liquid channel (112) which is arranged in the lower shell front bracket (101) and communicated with the lower shell cooling liquid channel (105), the second bracket communication liquid channel comprises a lower-shell rear bracket communication liquid channel (109) which is arranged in the lower-shell rear bracket (102) and communicated with the lower-shell cooling liquid channel (105);
the flow deflector (600) is arranged in the lower shell front bracket communicating liquid channel (112) and/or the lower shell rear bracket communicating liquid channel (109).
7. The electric vehicle power battery system structure of claim 6, further comprising a sealing partition plate (603) disposed in the lower casing front support communication liquid channel (112) or the lower casing rear support communication liquid channel (109), wherein the lower casing water inlet (106) and the lower casing water outlet (107) are disposed on two sides of the sealing partition plate (603), respectively.
8. The electric vehicle power battery system structure of claim 6, further comprising a battery upper support (200), wherein the first support comprises an upper front support (201), the second support comprises an upper rear support (202), the water inlet comprises an upper water inlet (208), the water outlet comprises an upper water outlet (209), the coolant channel comprises an upper coolant channel (203) extending from the upper front support (201) towards the upper rear support (202), the first support communication channel comprises an upper front support communication channel (207) disposed in the upper front support (201) and communicating with the upper coolant channel (203), the second support communication channel comprises an upper rear support communication channel (206) disposed in the upper rear support (202) and communicating with the upper coolant channel (203), the upper shell coolant passage (203) communicates with the lower shell coolant passage (105);
the flow deflector (600) is arranged in the upper shell front bracket communicating liquid channel (207) and/or the upper shell rear bracket communicating liquid channel (206).
9. The electric vehicle power battery system structure of claim 8, further comprising a closed partition (603) arranged in the upper casing front support communication liquid channel (207) or the upper casing rear support communication liquid channel (206), wherein the upper casing water inlet (208) and the upper casing water outlet (209) are respectively arranged on two sides of the closed partition (603).
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