CN109713177B - Electric automobile power battery lower casing - Google Patents
Electric automobile power battery lower casing Download PDFInfo
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- CN109713177B CN109713177B CN201811458788.5A CN201811458788A CN109713177B CN 109713177 B CN109713177 B CN 109713177B CN 201811458788 A CN201811458788 A CN 201811458788A CN 109713177 B CN109713177 B CN 109713177B
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- lower shell
- inferior valve
- support
- case
- poppet
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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
Abstract
The invention discloses a lower shell of a power battery of an electric automobile, which comprises: inferior valve fore-stock, inferior valve after-poppet, set up two inferior valve collateral branch framves in inferior valve fore-stock and inferior valve after-poppet both sides, the water inlet, and the delivery port, at the inferior valve fore-stock, inferior valve after-poppet, and be provided with at least one in the space that two inferior valve collateral branch framves enclose and extend and hollow inferior valve internal support from inferior valve fore-stock to inferior valve after-poppet direction, be equipped with the inferior valve coolant liquid passageway of being connected with the roof lower surface of inferior valve internal support in the at least inferior valve internal support, inferior valve coolant liquid passageway extends to inferior valve after-poppet direction from inferior valve fore-stock, and at least inferior valve coolant liquid passageway and water inlet intercommunication, at least inferior valve coolant liquid passageway and delivery port intercommunication. 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, reduces the size of the battery pack in the height direction and improves the riding comfort of vehicles.
Description
Technical Field
The invention relates to the related technical field of electric automobiles, in particular to a lower shell of a power battery of an electric automobile.
Background
In the market, as shown in fig. 1, in an existing electric vehicle with a battery pack temperature control system, a water cooling pipeline or a water cooling plate 1 'is generally designed separately in the prior art to cool a battery module 2'. The battery cold plate 1 'is typically secured to the lower housing 4' by a support structure 3', such as foam, with a thermally conductive layer 5' disposed between the battery cold plate 1 'and the battery module 2'. The existing structural design is complex, the requirement on the arrangement space is high, and the improvement of the riding comfort of the vehicle is not facilitated.
The prior art has the following disadvantages:
1. the number of parts is large, the structure is complex, and the assembly process is complicated;
2. the occupied space in the height direction (Z direction) is large, and the influence on the vehicle-level riding comfort is exerted.
3. The number of parts is large, the weight is large, and the lightweight of a battery system and the improvement of the energy density of the system are not facilitated.
Disclosure of Invention
In view of the above, it is necessary to provide a lower case of a power battery of an electric vehicle, which addresses the shortcomings of the prior art.
The invention provides a lower shell of a power battery of an electric automobile, which comprises: inferior valve fore-stock, inferior valve after-poppet, setting are in inferior valve fore-stock with two inferior valve collateral branch framves, water inlet and the delivery port of inferior valve after-poppet both sides be provided with at least one in the space that inferior valve fore-stock, inferior valve after-poppet and two the inferior valve collateral branch frame encloses be provided with at least one from inferior valve fore-stock to inferior valve after-poppet direction extends and hollow inferior valve internal support, at least one be equipped with in the inferior valve internal support with inferior valve coolant liquid passageway of the roof lower surface connection of inferior valve internal support, inferior valve coolant liquid passageway is followed inferior valve fore-stock to inferior valve after-poppet direction extends, and at least one inferior valve coolant liquid passageway with the water inlet intercommunication, at least one inferior valve coolant liquid passageway with the delivery port intercommunication.
Further, the cooling liquid channel comprises a connecting portion connected with the lower surface of the top plate of the lower shell inner support and a main body portion connected with the connecting portion, the connecting portion is communicated with the main body portion, and the width of the main body portion is larger than that of the connecting portion.
Furthermore, a preset gap is formed between the main body part and the lower surface of the top plate of the lower inner shell support.
Still further, a lower shell reinforcing rib extending from the lower shell front support to the lower shell rear support is arranged in the lower shell inner support.
Still further, the distance between the connecting part and the lower shell reinforcing rib is greater than or equal to a first distance threshold value.
Still further, the distance between the main body part and the bottom plate of the lower shell inner support is greater than or equal to a second distance threshold value.
Further, still including setting up inferior valve after-poppet intercommunication liquid way in the inferior valve after-poppet, it is a plurality of inferior valve coolant liquid passageway with inferior valve after-poppet intercommunication liquid way intercommunication.
Furthermore, the lower shell inner support is provided with an extension section at the bottom of the end part close to the lower shell rear support, a notch matched with the extension section is arranged below the lower shell rear support communicated liquid channel, and the extension section is inserted into the notch.
Still further, the lower shell inner support and the lower shell rear support are welded through a first welding point and a second welding point, the first welding point is located on a contact surface of the extending section and the notch, and the second welding point is located on a contact surface of a top plate of the lower shell inner support and the lower shell rear support.
Still further, the automobile body rear baffle structure comprises a rear baffle plate connected with the lower shell rear support and an automobile body connecting structure connected with the lower shell side support.
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.
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 the present invention;
FIG. 3 is a transverse sectional view of a lower case of a power battery of an electric vehicle according to the present 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 another embodiment of the present invention showing the cooling fluid passages in the lower shell and the internal support of the lower shell;
FIG. 6 is a longitudinal sectional view of a lower case of a power battery for an electric vehicle according to the present invention;
fig. 7 is an exploded view of the dashed-line block diagram of fig. 6.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
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: the cooling structure comprises a lower shell front support 101, a lower shell rear support 102, two lower shell side supports 103 arranged on two sides of the lower shell front support 101 and the lower shell rear support 102, a water inlet 106 and a water outlet 107, 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 a 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, at least one lower shell cooling liquid channel 105 is communicated with the water inlet 106, and at least one lower shell cooling liquid channel 105 is communicated with the 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 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 shell cooling liquid channel 105 is provided, the front and rear ends of the lower shell cooling liquid channel 105 are respectively communicated with the water inlet 106 and the water outlet 107. 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 water inlet 106, and at least one lower shell cooling liquid channel 105 is communicated with the water outlet 107. The positions of the water inlet 106 and the water outlet 107 are not limited. In fig. 2, the water inlet 106 and the water outlet 107 are provided in the lower case front bracket 101 for illustration only. In practice, the water inlet 106 and the water outlet 107 may be provided at the same time in the lower case front bracket 101, at the same time in the lower case rear bracket 102, or one in the lower case front bracket 101 and the other in the lower case rear bracket 102. A coolant, such as water, is introduced from the water inlet port 106 into the lower case coolant passage 105, 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 ceiling of the lower case inner support 104, and is taken away by the coolant in the lower case coolant passage 105, and the coolant flows out through the water outlet port 107, taking 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 water inlet 106, a 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 mutually communicated, at least one lower shell cooling liquid channel 105 is communicated with the water inlet 106, at least one lower shell cooling liquid channel 105 is communicated with the 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 adopting an aluminum material;
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 (8)
1. An electric vehicle power battery lower case (100), comprising: the cooling structure comprises 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 water inlet (106) and a water outlet (107), 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 a 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 at least one lower shell cooling liquid channel (105) is communicated with the water inlet (106), at least one lower shell cooling liquid channel (105) is communicated with the water outlet (107);
the coolant passage (105) includes a joint portion (1051) joined to a lower surface of the top plate of the under-shell inner bracket (104), and a body portion (1052) joined to the joint portion (1051), and a width of the body portion (1052) is larger than a width of the joint portion (1051);
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, inferior valve internal support (104) are being close to the tip bottom of inferior valve after-poppet (102) is equipped with extension section (1041), inferior valve after-poppet (102) are in the below of inferior valve after-poppet intercommunication liquid way (109) be equipped with extension section (1041) complex breach (1021), it inserts to extend section (1041) breach (1021).
2. The electric vehicle power battery lower case (100) according to claim 1, wherein the connecting portion (1051) communicates with the main body portion (1052).
3. The lower case (100) for power battery of electric vehicle according to claim 1, wherein a predetermined gap is provided between the main body portion (1052) and the lower surface of the top plate of the inner case bracket (104).
4. The lower case (100) of the power battery of the electric vehicle according to any one of claims 1 to 3, wherein a lower case reinforcing rib (108) extending from the lower case front bracket (101) to the lower case rear bracket (102) is provided in the lower case inner bracket (104).
5. The lower case (100) of the power battery of the electric vehicle according to claim 4, wherein a distance between the connecting portion (1051) and the lower case reinforcing rib (108) is equal to or greater than a first distance threshold.
6. The lower case (100) of the power battery of an electric vehicle according to claim 4, wherein the distance between the main body portion (1052) and the bottom plate of the inner case bracket (104) is greater than or equal to a second distance threshold.
7. The lower case (100) of the electric vehicle power battery according to claim 1, wherein the inner case support (104) and the rear case support (102) are welded by a first welding point (1042) and a second welding point (1043), the first welding point (1042) is located at a contact surface of the extension section (1041) and the notch (1021), and the second welding point (1043) is located at a contact surface of a top plate of the inner case support (104) and the rear case support (102).
8. The lower case (100) of the power battery of the electric vehicle according to claim 1, further comprising 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811458788.5A CN109713177B (en) | 2018-11-30 | 2018-11-30 | Electric automobile power battery lower casing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811458788.5A CN109713177B (en) | 2018-11-30 | 2018-11-30 | Electric automobile power battery lower casing |
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| CN109713177A CN109713177A (en) | 2019-05-03 |
| CN109713177B true CN109713177B (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811458788.5A Active CN109713177B (en) | 2018-11-30 | 2018-11-30 | Electric automobile power battery lower casing |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110233216B (en) * | 2019-05-27 | 2022-08-19 | 蜂巢能源科技有限公司 | Battery pack and vehicle |
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| CN109713177A (en) | 2019-05-03 |
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