Battery pack lower shell and battery pack

Abstract

The present application provides a battery pack lower shell and a battery pack, which relate to the technical field of battery equipment. The battery pack lower shell includes a first side beam, a first flow channel is provided in the first side beam, the first side beam is used to communicate with the water outlet of the liquid cooling circulation equipment, and the first side beam has an output hole connected to the first flow channel; a second side beam, the second side beam has a second flow channel, the second side beam is used to communicate with the water return end of the liquid cooling circulation equipment, and the second side beam has an input hole connected to the second flow channel; a liquid cooling plate, the output hole is connected to the input hole through the liquid cooling plate; a first support member, the first support member is supported and arranged on the output hole; and / or a second support member, the second support member is supported and arranged on the input hole. The battery pack lower shell of the embodiment of the present application reduces the probability of the input hole and / or the output hole collapsing or being damaged due to external force, and improves the stability of the battery pack lower shell.

Description

Technical Field

[0001] The present application relates to the technical field of power battery equipment, and in particular to a battery pack lower shell and a battery pack. Background Art

[0002] In related technologies, the lower shell of the battery pack is one of the important components of the battery pack. The battery module is generally placed on the lower shell of the battery pack. The lower shell of the battery pack can provide a physical barrier for the battery module to prevent the internal components of the battery module from being damaged by the external environment, such as mechanical collision, vibration, etc.

[0003] In order to dissipate heat for the battery module, a liquid cooling structure may be provided on the lower shell of the battery pack to exchange heat and cool the battery module.

[0004] However, the structural strength of the connection between the water inlet and outlet of the side beam and the liquid cooling plate in the related art is low, and welding collapse is prone to occur, resulting in low overall stability of the lower shell of the battery pack. Utility Model Content

[0005] The embodiments of the present application provide a battery pack lower shell and a battery pack, which are used to solve the problem that the input hole and / or output hole on the side beam in the above-mentioned related art collapses or is damaged due to external force, thereby improving the stability of the battery pack lower shell.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery pack lower housing, comprising:

[0008] A first side beam, wherein a first flow channel is formed in the first side beam, the first side beam is used to communicate with a water outlet of a liquid cooling circulation device, and the first side beam has an output hole connected to the first flow channel;

[0009] A second side beam, wherein the second side beam has a second flow channel, the second side beam is used to communicate with the return water end of the liquid cooling circulation device, and the second side beam has an input hole connected to the second flow channel;

[0010] A liquid cooling plate, wherein the output hole is connected to the input hole through the liquid cooling plate;

[0011] A first support member, the first support member is supported and disposed on the output hole;

[0012] And / or, a second support member, wherein the second support member is supported and disposed on the input hole.

[0013] Based on the above technical solution, the present application can also be improved as follows.

[0014] In a possible implementation, the first side beam and the second side beam both extend along a first direction;

[0015] One end of the first side beam along the first direction has a liquid inlet end connected to the water outlet end;

[0016] One end of the second side beam along the first direction has a liquid outlet end connected to the water return end;

[0017] In the first direction, the liquid inlet end and the liquid outlet end are arranged on the same side;

[0018] The first side beam has a plurality of output holes arranged at intervals along the first direction, and in the first direction, the cross-sectional areas of the plurality of output holes increase as the distance from the liquid inlet end increases; and / or

[0019] The second side beam has a plurality of input holes arranged at intervals along the first direction, and the cross-sectional areas of the plurality of input holes increase with increasing distance from the liquid outlet.

[0020] In a possible implementation, the first support member has a first support surface, and the first support surface is in contact with the inner wall of the output hole;

[0021] The second supporting member has a second supporting surface, and the second supporting surface is in contact with the inner wall of the input hole.

[0022] In a possible implementation, the first support member is a first annular member, the first annular member is disposed in the output hole, the outer surface of the first annular member is the first support surface, and the first annular member is coaxially disposed with the output hole;

[0023] The second supporting member is a second annular member, the second annular member is arranged in the input hole, the outer surface of the second annular member is the second supporting surface, and the second annular member is coaxially arranged with the input hole.

[0024] In a possible implementation, the first side beam has a first plug-in structure, and the output hole is arranged in the first plug-in structure;

[0025] The liquid cooling plate has a first opening connected to the internal flow channel of the liquid cooling plate, and the first plug-in structure is inserted into the first opening;

[0026] The second side beam has a second plug-in structure, and the input hole is arranged in the second plug-in structure;

[0027] The liquid cooling plate has a second opening connected to an internal flow channel of the liquid cooling plate, and the second plug-in structure is inserted into the second opening.

[0028] In a possible implementation, the portion where the first plug structure overlaps with the inner surface of the first opening is a first connecting portion, and the length of the first annular member along the axial direction is greater than or equal to the length of the first connecting portion along the axial direction;

[0029] The portion where the second plug-in structure overlaps with the inner surface of the second opening is a second connecting portion, and the axial length of the second annular member is greater than or equal to the axial length of the second connecting portion.

[0030] In a possible implementation, the strength of the first support member is greater than the strength of the first side beam;

[0031] The strength of the second supporting member is greater than the strength of the second side beam.

[0032] In a possible implementation manner, the first side beam and the second side beam are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction;

[0033] There are a plurality of liquid cooling plates, each of which is disposed between the first side beam and the second side beam, and the plurality of liquid cooling plates are arranged at intervals along the first direction;

[0034] The first side beam has a plurality of output holes arranged at intervals along the first direction, and each of the input holes is provided with a first annular member;

[0035] The second side beam has a plurality of input holes arranged at intervals along the first direction, and a second annular member is disposed in each of the output holes.

[0036] In a possible implementation, the output hole is a first strip hole, the first strip hole extends along the first direction, and in the first direction, the length of the plurality of first strip holes increases as the distance from the liquid inlet end increases;

[0037] The lengths of the plurality of first annular members along the first direction increase as the distance from the liquid inlet end increases;

[0038] The input hole is a second strip hole, and in the first direction, the second strip holes extend along the first direction, and the length of the plurality of second strip holes increases as the distance from the liquid outlet increases;

[0039] The lengths of the plurality of second annular members along the first direction also increase as the distance from the liquid outlet increases.

[0040] In a possible implementation, when the length of the first annular member along the first direction is greater than or equal to 10 mm, a first reinforcing rib is provided in the first annular member;

[0041] When the length of the second annular member along the first direction is greater than or equal to 10 mm, a second reinforcing rib is provided in the second annular member.

[0042] In a possible implementation, the first strip-shaped hole has a first inner side wall and a second inner side wall arranged opposite to each other along a third direction, one end of the first reinforcing rib is connected to the first inner side wall, and the other end of the first reinforcing rib is connected to the second inner side wall, and the third direction is perpendicular to the first direction;

[0043] The second strip-shaped hole has a third inner side wall and a fourth inner side wall that are arranged opposite to each other along the third direction, one end of the second reinforcing rib is connected to the third inner side wall, and the other end of the second reinforcing rib is connected to the fourth inner side wall.

[0044] A second aspect of an embodiment of the present application provides a battery pack, which includes a battery module and a battery pack lower shell as described above, wherein the battery module is mounted on the battery pack lower shell.

[0045] An embodiment of the present application provides a battery pack lower shell and a battery pack, wherein the battery pack lower shell is provided with a first flow channel connected to a water outlet end of a liquid cooling circulation device in a first side beam, and a second flow channel connected to a water return end of the liquid cooling circulation device in a second side beam, and the output hole on the first side beam connected to the first flow channel is connected to the input hole on the second side beam connected to the second flow channel through a liquid cooling plate, thereby enabling the first channel in the first side beam and the second channel in the second side beam to replace the liquid inlet pipeline and the liquid return pipeline separately provided in the related art, thereby improving the space utilization on the battery pack lower shell, reducing the manufacturing cost of the battery pack lower shell, and improving the rationality of the layout in the battery pack.

[0046] Furthermore, by providing a first support member at the output hole and / or a second support member at the input hole, the strength of the output hole and / or the input hole can be improved, the probability of the input hole and / or the output hole collapsing or being damaged due to external force can be reduced, and the stability of the lower shell of the battery pack can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 A schematic diagram of the structure of a lower shell of a battery pack provided in an embodiment of the present application;

[0049] Figure 2 A schematic structural diagram of a first side beam provided in an embodiment of the present application;

[0050] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0051] Figure 4 A schematic diagram of the structure of a second side beam provided in an embodiment of the present application;

[0052] Figure 5 for Figure 4 A local enlarged view of point B in FIG.

[0053] Figure 6 A schematic cross-sectional view of a lower shell of a battery pack provided in an embodiment of the present application;

[0054] Figure 7 for Figure 6 A local enlarged view of point C in FIG.

[0055] Figure 8 A schematic cross-sectional view of another angle of a lower housing of a battery pack provided in an embodiment of the present application;

[0056] Fig. 9 for Figure 8 A local enlarged view of point D in FIG.

[0057] Description of reference numerals:

[0058] 100-first side beam;

[0059] 110 - first flow channel; 120 - output hole; 130 - liquid inlet end; 140 - first plug-in structure;

[0060] 141- first connecting portion;

[0061] 200-second side beam;

[0062] 210 - second flow channel; 220 - input hole; 230 - liquid outlet; 240 - second plug-in structure;

[0063] 241- second connecting portion;

[0064] 300-Liquid cooling plate;

[0065] 310-first opening; 320-second opening;

[0066] 400-first support member;

[0067] 410-first supporting surface;

[0068] 500- second support member;

[0069] 510 - second supporting surface;

[0070] 600-first reinforcement rib;

[0071] 700-second reinforcement;

[0072] 800-beam. DETAILED DESCRIPTION

[0073] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0074] refer to Figure 1 The embodiment of the present application provides a battery pack lower shell, which may include a first side beam 100, a second side beam 200, a liquid cooling plate 300, a first support member 400 or a second support member 500. The battery pack lower shell may also include a first support member 400 and a second support member 500 at the same time.

[0075] refer to Figure 2 and Figure 3 The first side beam 100 has a first flow channel 110 therein, and the first flow channel 110 can extend along the length direction of the first side beam 100. The first side beam 100 is used to be connected to the water outlet end of the liquid cooling circulation equipment. The first side beam 100 has an output hole 120 connected to the first flow channel 110. The coolant output from the water outlet end of the liquid cooling circulation equipment is a coolant that has not undergone heat exchange.

[0076] refer to Figure 3 In some embodiments, the first side beam 100 may have a plurality of output holes 120, each of which can connect the first flow channel 110 with the internal flow channel of the liquid cooling plate 300. The greater the number of output holes 120, the more conducive it is to improving the efficiency of transporting the coolant from the first flow channel 110 to the liquid cooling plate 300.

[0077] refer to Figure 4 and Figure 5 The second side beam 200 has a second flow channel 210, and the second flow channel 210 can also extend along the length direction of the second side beam 200. The second side beam 200 is used to be connected to the return water end of the liquid cooling circulation equipment. The second side beam 200 has an input hole 220 connected to the second flow channel 210. The coolant at the return water end of the liquid cooling circulation equipment is the coolant after heat exchange.

[0078] The liquid cooling circulation device can process the coolant after heat exchange that flows back into the liquid cooling circulation device from the return end, and transport the processed coolant from the water outlet end to the first flow channel 110 in the first side beam 100 again.

[0079] refer to Figure 5 In some embodiments, the second side beam 200 may have a plurality of input holes 220, each of which can connect the second flow channel 210 with the internal flow channel of the liquid cooling plate 300. The greater the number of input holes 220, the more conducive it is to improving the efficiency of transporting the coolant from the liquid cooling plate 300 to the second flow channel 210.

[0080] The output hole 120 is connected with the input hole 220 through the liquid cooling plate 300. The liquid cooling plate 300 can be arranged between the first side beam 100 and the second side beam 200. The liquid cooling plate 300 has a flow channel inside for the flow of coolant. One end of the liquid cooling plate 300 is connected with the output hole 120, and the other end of the liquid cooling plate 300 is connected with the input hole 220, so that the first flow channel 110 and the second flow channel 210 are connected through the flow channel inside the liquid cooling plate 300, so that the liquid cooling plate 300 can form a circulating heat dissipation device with the liquid cooling circulation equipment through the first side beam 100 and the second side beam 200.

[0081] refer to Figure 1 In some embodiments, the liquid cooling plate 300 may have one, and one liquid cooling plate 300 can be connected to multiple output holes 120, and one liquid cooling plate 300 can also be connected to multiple input holes 220, which can increase the circulation of the cooling liquid in the first channel 110, the liquid cooling plate 300 and the second channel 210, and can increase the circulation of the cooling liquid in the liquid cooling plate 300, thereby improving the heat dissipation effect of the liquid cooling plate 300.

[0082] There may also be multiple liquid cooling plates 300, which can be arranged at intervals along the extension direction of the first side beam 100. By arranging multiple liquid cooling plates 300 between the first side beam 100 and the second side beam 200, the heat dissipation efficiency of the lower shell of the battery pack to the battery module can be improved.

[0083] refer to Figure 3 The first support member 400 is supported and arranged on the output hole 120. The first support member 400 can be arranged in the output hole 120. The first support member 400 can support the inner wall of the output hole 120 while allowing the first flow channel 110 to communicate with the inside of the liquid cooling plate 300 through the output hole 120, thereby reducing the probability of the output hole 120 collapsing and being damaged due to external force.

[0084] refer to Figure 5The second support member 500 is supported and arranged on the input hole 220, and the first support member 400 can be arranged in the input hole 220. The second support member 500 can support the inner wall of the input hole 220 while allowing the second flow channel 210 to communicate with the inside of the liquid cooling plate 300 through the input hole 220, thereby reducing the probability of the input hole 220 collapsing and being damaged due to external force. In this way, the support strength of the input hole 220 and the output hole 120 during the friction stir welding with the edge beam can be improved, and the occurrence of welding collapse can be prevented.

[0085] The battery pack lower shell provided in the embodiment of the present application is provided with a first flow channel 110 for connecting to the water outlet end of the liquid cooling circulation equipment in the first side beam 100, and a second flow channel 210 for connecting to the water return end of the liquid cooling circulation equipment in the second side beam 200, and the output hole 120 on the first side beam 100 connected to the first flow channel 110 is connected to the input hole 220 on the second side beam 200 connected to the second flow channel 210 through the liquid cooling plate 300, thereby realizing the use of the first flow channel 110 in the first side beam 100 and the second flow channel 210 in the second side beam 200 to replace the liquid inlet pipeline and the liquid return pipeline separately provided in the related art, thereby improving the space utilization rate of the battery pack lower shell, reducing the manufacturing cost of the battery pack lower shell, and improving the rationality of the layout in the battery pack.

[0086] Furthermore, by providing a first support member 400 at the output hole 120 and / or providing a second support member 500 at the input hole 220, the strength of the output hole 120 and / or the input hole 220 can be improved, the probability of the input hole 220 and / or the output hole 120 collapsing or being damaged due to external force can be reduced, and the stability of the lower shell of the battery pack can be improved.

[0087] refer to Figure 1 In some embodiments, the lower shell of the battery pack further includes a plurality of cross beams 800, which are disposed between the first side beam 100 and the second side beam 200, and the plurality of cross beams 800 are arranged at intervals along the length direction of the first side beam 100, and the first side beam 100 is connected to the second side beam 200 through the plurality of cross beams 800.

[0088] refer to Figure 1 In some embodiments, the first side beam 100 and the second side beam 200 are both along a first direction (eg Figure 1 The first side beam 100 extends along one end of the first direction and has a liquid inlet end 130 connected to the water outlet end, and the second side beam 200 extends along one end of the first direction and has a liquid outlet end 230 connected to the water return end.

[0089] refer to Figure 2 and Figure 4It can be understood that if the first side beam 100 has a plurality of output holes 120, and the plurality of output holes 120 can be arranged at intervals along the first direction, when the sizes of the output holes 120 are the same, the farther the output hole 120 is from the liquid inlet end 130, the smaller the flow rate of the coolant in the first flow channel 110 flowing into the liquid cooling plate 300 through the output hole 120, thereby causing uneven distribution of the coolant in the liquid cooling plate 300, affecting the heat dissipation effect of the liquid cooling plate 300 on the battery module.

[0090] Similarly, if the second side beam 200 has a plurality of input holes 220, and the plurality of input holes 220 can be arranged at intervals along the first direction, when the sizes of the input holes 220 are the same, the farther the input hole 220 is from the liquid outlet 230, the smaller the flow rate of the coolant in the liquid cooling plate 300 flowing into the second flow channel 210 through the input hole 220, which will also cause uneven distribution of the coolant in the liquid cooling plate 300, affecting the heat dissipation effect of the liquid cooling plate 300 on the battery module.

[0091] refer to Figure 1 In some embodiments, in the first direction, the liquid inlet end 130 and the liquid outlet end 230 are arranged on the same side, for example, the liquid inlet end 130 and the liquid outlet end 230 can be arranged at the same end along the first direction on the first side beam 100 and the second side beam 200. Alternatively, the liquid inlet end 130 and the liquid outlet end 230 can be arranged in the middle of the first side beam 100 and the second side beam 200.

[0092] refer to Figure 2 and Figure 3 If the first side beam 100 has a plurality of output holes 120 arranged at intervals along the first direction, in the first direction, the cross-sectional area of ​​the plurality of output holes 120 increases as the distance from the liquid inlet end 130 increases, thereby increasing the flow area of ​​the output holes 120 farther from the liquid inlet end 130, increasing the amount of coolant transported by the first flow channel 110 to the liquid cooling plate 300, and further enabling the coolant transported by the first flow channel 110 to the liquid cooling plate 300 to be more evenly distributed in the liquid cooling plate 300, thereby improving the uniformity of heat dissipation of the liquid cooling plate 300 to the battery module.

[0093] refer to Figure 1 In some embodiments, the first side beam 100 and the second side beam 200 can be moved along a second direction (eg Figure 1 The second direction is perpendicular to the first direction.

[0094] There can be multiple liquid cooling plates 300, and the multiple liquid cooling plates 300 are all arranged between the first side beam 100 and the second side beam 200, and the multiple liquid cooling plates 300 are arranged at intervals along the first direction. By providing multiple liquid cooling plates 300, the efficiency of heat dissipation of the battery module can be improved, and the heat dissipation area can be increased.

[0095] refer to Figure 3 The first side beam 100 has a plurality of output holes 120 arranged at intervals along the first direction, and a first support member 400 is disposed in each output hole 120 .

[0096] The second side beam 200 has a plurality of input holes 220 arranged at intervals along the first direction, and a second support member 500 is disposed in each input hole 220 .

[0097] refer to Figure 4 and Figure 5 Furthermore, if the second side beam 200 has a plurality of input holes 220 arranged at intervals along the first direction, the cross-sectional area of ​​the plurality of input holes 220 increases with the increasing distance from the liquid outlet end 230, thereby increasing the flow area of ​​the input holes 220 farther from the liquid outlet end 230, and increasing the amount of coolant transported by the liquid cooling plate 300 to the second flow channel 210 through the input holes 220 farther from the liquid outlet end 230, thereby further improving the uniformity of the distribution of the coolant in the liquid cooling plate 300, and improving the uniformity of the heat dissipation of the battery module by the liquid cooling plate 300.

[0098] refer to Figure 3 In some embodiments, the output hole 120 is a first strip hole, which extends along a first direction. In the first direction, the length of the plurality of first strip holes increases with the distance from the liquid inlet end 130, so as to increase the flow area of ​​the first strip holes farther from the liquid inlet end 130, increase the amount of coolant in the first flow channel 110 input into the liquid cooling plate 300 in the area farther from the liquid inlet end 130, and improve the uniformity of the distribution of the coolant in the liquid cooling plate 300.

[0099] refer to Figure 5 The input hole 220 is a second strip hole. In the first direction, the second strip hole extends along the first direction. The length of the plurality of second strip holes increases with the distance from the liquid outlet end 230, so as to increase the flow area of ​​the second strip holes farther from the liquid outlet end 230, increase the amount of coolant in the liquid cooling plate 300 input into the second flow channel 210 in the area farther from the liquid outlet end 230, and improve the distribution uniformity of the coolant in the liquid cooling plate 300.

[0100] refer to Figure 3 In some embodiments, when the length of the first annular member along the first direction is greater than or equal to 10 mm, a first reinforcing rib 600 is provided in the first annular member.

[0101] By arranging the first reinforcing rib 600 in the first annular member, the first reinforcing rib 600 is used to support two inner walls of the first annular member opposite to each other in the height direction of the first side beam 100, thereby improving the supporting performance of the first annular member and reducing the probability of deformation of the first annular member due to external impact.

[0102] In some embodiments, a plurality of first reinforcing ribs 600 may be disposed in the first annular member, and the plurality of first reinforcing ribs 600 are arranged at intervals in the length direction of the first side beam 100. By providing a plurality of first reinforcing ribs 600, the supporting performance of the first annular member can be further improved.

[0103] refer to Figure 5 When the length of the second annular member along the first direction is greater than or equal to 10 mm, a second reinforcing rib 700 is provided in the second annular member.

[0104] By arranging the second reinforcing rib 700 in the second annular member, the second reinforcing rib 700 is used to support two inner walls of the second annular member opposite to each other in the height direction of the second side beam 200, thereby improving the supporting performance of the second annular member and reducing the probability of deformation of the second annular member due to external impact.

[0105] In some embodiments, a plurality of second reinforcing ribs 700 may be provided in the second annular member, and the plurality of second reinforcing ribs 700 are arranged at intervals in the length direction of the second side beam 200. By providing a plurality of second reinforcing ribs 700, the supporting performance of the second annular member can be further improved.

[0106] refer to Figure 3 In a specific implementation, the first strip-shaped hole has a third direction (such as Figure 3 The first inner side wall and the second inner side wall are arranged opposite to each other (as shown by the arrow Z in FIG. 1 ), one end of the first reinforcing rib 600 is connected to the first inner side wall, and the other end of the first reinforcing rib 600 is connected to the second inner side wall, and the third direction is perpendicular to the first direction. That is, the first reinforcing rib 600 is supported and connected between the first inner side wall and the second inner side wall. The third direction can be the height direction of the first side beam 100.

[0107] refer to Figure 5 The second strip hole has a third direction (such as Figure 5 The third inner wall and the fourth inner wall are arranged opposite to each other (as shown by the arrow Z in FIG. 1 ), one end of the second reinforcing rib 700 is connected to the third inner wall, and the other end of the second reinforcing rib 700 is connected to the fourth inner wall. That is, the second reinforcing rib 700 is supported and connected between the third inner wall and the fourth inner wall.

[0108] refer to Figure 6 and Figure 7 In some embodiments, the first support member 400 has a first support surface 410, and the first support surface 410 fits the inner wall of the output hole 120. By making the first support surface 410 of the first support member 400 fit the inner wall of the output hole 120, the inner wall of the output hole 120 is supported by the first support member 400, thereby reducing the probability of the output hole 120 collapsing.

[0109] In some embodiments, the surface area of ​​the first supporting surface 410 can be greater than or equal to the surface area of ​​the inner wall of the output hole 120 .

[0110] refer to Figure 8 and Fig. 9 In some embodiments, the second support member 500 has a second support surface 510, and the second support surface 510 fits the inner wall of the input hole 220. By making the second support surface 510 of the second support member 500 fit the inner wall of the input hole 220, the inner wall of the input hole 220 is supported by the second support member 500, thereby reducing the probability of the input hole 220 collapsing.

[0111] In some embodiments, the surface area of ​​the second supporting surface 510 can be greater than or equal to the surface area of ​​the inner wall of the input hole 220 .

[0112] refer to Figure 3 and Figure 7 In some embodiments, the first support member 400 is a first annular member, which is disposed in the output hole 120 , and the outer surface of the first annular member is the first support surface 410 , and the first annular member is coaxially disposed with the output hole 120 .

[0113] If there are multiple output holes 120 and they are arranged at intervals along the first direction, a first annular member is disposed in each output hole 120 .

[0114] The first annular member can be arranged in the output hole 120 in an embedded manner, so that the first supporting surface 410 of the first annular member is in close contact with the inner wall of the output hole 120. The first annular member is arranged in the output hole 120 in an embedded manner, which improves the convenience of assembling the first annular member in the output hole 120 and the connection stability between the first annular member and the output hole 120.

[0115] refer to Figure 5 and Fig. 9 The second supporting member 500 is a second annular member, which is disposed in the input hole 220 . The outer surface of the second annular member is a second supporting surface 510 . The second annular member is coaxially disposed with the input hole 220 .

[0116] If there are multiple input holes 220 , and they are arranged at intervals along the first direction, and each input hole 220 is arranged corresponding to an output hole 120 , then a second annular member is arranged in each input hole 220 .

[0117] The second annular member can also be arranged in the input hole 220 in an embedded manner, so that the second supporting surface 510 of the second annular member is in close contact with the inner wall of the input hole 220. The second annular member is arranged in the input hole 220 in an embedded manner, which improves the convenience of assembling the second annular member in the output hole 120 and the connection stability between the second annular member and the input hole 220.

[0118] In some embodiments, the strength of the first support member 400 is greater than that of the first side beam 100 , so that when the first side beam 100 is impacted, it can resist the impact force transmitted from the first side beam 100 to the location of the output hole 120 , thereby reducing the probability of deformation or crushing of the output hole 120 .

[0119] Similarly, the second support member 500 is stronger than the second side beam 200 and can resist the impact force transmitted from the second side beam 200 to the input hole 220 when the second side beam 200 is impacted, thereby reducing the probability of deformation or crushing of the input hole 220.

[0120] In some embodiments, if the first side beam 100 is a metal part, the first support member 400 may be a metal part having a greater strength than the first side beam 100 or a structural member made of other materials having a greater strength than the first side beam 100. If the second side beam 200 is a metal part, the second support member 500 may be a metal part having a greater strength than the second side beam 200 or a structural member made of other materials having a greater strength than the second side beam 200.

[0121] In a specific implementation, the first support member 400 may be a first ring-shaped member made of a metal material, and the second support member 500 may be a second ring-shaped member made of a metal material. The first support member 400 and the second support member 500 may be made of the same material.

[0122] refer to Figure 3 In some embodiments, if the output hole 120 is a first strip hole, the first strip hole extends along the first direction. In the first direction, if the length of the plurality of first strip holes increases as the distance from the liquid inlet end 130 increases, the length of the plurality of first annular members along the first direction increases as the distance from the liquid inlet end 130 increases.

[0123] If the input hole 220 is a second strip hole, the second strip hole extends along the first direction. In the first direction, the length of the plurality of second strip holes increases with the distance from the liquid outlet 230, and the length of the plurality of second ring members along the first direction also increases with the distance from the liquid outlet 230.

[0124] refer to Figure 7 In some embodiments, the first side beam 100 has a first plug-in structure 140 , and the output hole 120 is disposed in the first plug-in structure 140 . The liquid cooling plate 300 has a first opening 310 connected to the internal flow channel of the liquid cooling plate 300 , and the first plug-in structure 140 is inserted in the first opening 310 .

[0125] By inserting the first plug structure 140 into the first opening 310, the first side beam 100 and the liquid cooling plate 300 are connected, so that the connection stability between the first side beam 100 and the liquid cooling plate 300 can be improved. In addition, by inserting the first plug structure 140 into the first opening 310, the sealing performance between the output hole 120 and the first opening 310 can be improved, and the probability of the coolant leaking from the joint between the first opening 310 and the output hole 120 can be reduced.

[0126] refer to Figure 7 In some embodiments, the portion where the first plug-in structure 140 overlaps with the inner surface of the first opening 310 is the first connecting portion 141 , and the axial length of the first annular member is greater than or equal to the axial length of the first connecting portion 141 .

[0127] By making the axial length of the first annular member greater than or equal to the axial length of the first connecting portion 141 , the supporting area of ​​the first annular member for supporting the output hole 120 can be increased, thereby improving the supporting performance of the first annular member for the output hole 120 .

[0128] refer to Fig. 9 The second side beam 200 has a second plug-in structure 240 , and the input hole 220 is disposed in the second plug-in structure 240 . The liquid cooling plate 300 has a second opening 320 communicating with the internal flow channel of the liquid cooling plate 300 , and the second plug-in structure 240 is inserted in the second opening 320 .

[0129] By inserting the second plug structure 240 into the second opening 320, the second side beam 200 and the liquid cooling plate 300 are connected, thereby improving the connection stability between the second side beam 200 and the liquid cooling plate 300. In addition, by inserting the second plug structure 240 into the second opening 320, the sealing performance between the input hole 220 and the second opening 320 can be improved, and the probability of cooling liquid leaking from the joint between the second opening 320 and the input hole 220 can be reduced.

[0130] refer to Fig. 9 The portion where the second plug-in structure 240 overlaps with the inner surface of the second opening 320 is the second connecting portion 241 , and the axial length of the second annular member is greater than or equal to the axial length of the second connecting portion 241 .

[0131] By making the axial length of the second annular member greater than or equal to the axial length of the second connecting portion 241 , the supporting area of ​​the second annular member for supporting the input hole 220 can be increased, thereby improving the supporting performance of the second annular member for the input hole 220 .

[0132] The present application also provides a battery pack, which may include a battery module and a battery pack lower shell as described above, wherein the battery module is mounted on the battery pack lower shell. By using the battery pack lower shell described above and arranging the battery module in the battery pack lower shell, the heat dissipation performance of the battery module can be improved, and the durability and service life of the battery pack can also be improved.

[0133] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0134] It should be noted that the phrases "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification indicate that the described embodiment may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0135] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0136] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” means not only “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0137] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack lower shell, characterized in that: include: A first side beam, wherein a first flow channel is formed in the first side beam, the first side beam is used to communicate with a water outlet of a liquid cooling circulation device, and the first side beam has an output hole connected to the first flow channel; A second side beam, wherein the second side beam has a second flow channel, the second side beam is used to communicate with the return water end of the liquid cooling circulation device, and the second side beam has an input hole connected to the second flow channel; A liquid cooling plate, wherein the output hole is connected to the input hole through the liquid cooling plate; A first support member, the first support member is supported and disposed on the output hole; And / or, a second support member, wherein the second support member is supported and disposed on the input hole.

2. The battery pack lower shell according to claim 1, characterized in that: The first side beam and the second side beam both extend along a first direction; One end of the first side beam along the first direction has a liquid inlet end connected to the water outlet end; One end of the second side beam along the first direction has a liquid outlet end connected to the water return end; In the first direction, the liquid inlet end and the liquid outlet end are arranged on the same side; The first side beam has a plurality of output holes arranged at intervals along the first direction, and in the first direction, the cross-sectional areas of the plurality of output holes increase as the distance from the liquid inlet end increases; and / or The second side beam has a plurality of input holes arranged at intervals along the first direction, and the cross-sectional areas of the plurality of input holes increase with increasing distance from the liquid outlet.

3. The battery pack lower shell according to claim 2, characterized in that: The first supporting member has a first supporting surface, and the first supporting surface is in contact with the inner wall of the output hole; The second supporting member has a second supporting surface, and the second supporting surface is in contact with the inner wall of the input hole.

4. The battery pack lower shell according to claim 3, characterized in that: The first supporting member is a first annular member, the first annular member is disposed in the output hole, the outer surface of the first annular member is the first supporting surface, and the first annular member is coaxially disposed with the output hole; The second supporting member is a second annular member, the second annular member is arranged in the input hole, the outer surface of the second annular member is the second supporting surface, and the second annular member is coaxially arranged with the input hole.

5. The battery pack lower shell according to claim 4, characterized in that: The first side beam has a first plug-in structure, and the output hole is arranged in the first plug-in structure; The liquid cooling plate has a first opening connected to the internal flow channel of the liquid cooling plate, and the first plug-in structure is inserted into the first opening; The second side beam has a second plug-in structure, and the input hole is arranged in the second plug-in structure; The liquid cooling plate has a second opening connected to an internal flow channel of the liquid cooling plate, and the second plug-in structure is inserted into the second opening.

6. The battery pack lower shell according to claim 5, characterized in that: The portion where the first plug-in structure overlaps with the inner surface of the first opening is a first connecting portion, and the length of the first annular member along the axial direction is greater than or equal to the length of the first connecting portion along the axial direction; The portion where the second plug-in structure overlaps with the inner surface of the second opening is a second connecting portion, and the axial length of the second annular member is greater than or equal to the axial length of the second connecting portion.

7. The battery pack lower shell according to claim 1, characterized in that: The strength of the first support member is greater than the strength of the first side beam; The strength of the second supporting member is greater than the strength of the second side beam.

8. The battery pack lower shell according to claim 2, characterized in that: The first side beam and the second side beam are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; There are a plurality of liquid cooling plates, each of which is disposed between the first side beam and the second side beam, and the plurality of liquid cooling plates are arranged at intervals along the first direction; The first side beam has a plurality of output holes arranged at intervals along the first direction, and each of the output holes is provided with a first annular member; The second side beam has a plurality of input holes arranged at intervals along the first direction, and a second annular member is disposed in each of the input holes.

9. The battery pack lower shell according to claim 8, characterized in that: The output hole is a first strip hole, the first strip hole extends along the first direction, and in the first direction, the length of the plurality of first strip holes increases as the distance from the liquid inlet end increases; The lengths of the plurality of first annular members along the first direction increase as the distance from the liquid inlet end increases; The input hole is a second strip hole, and in the first direction, the second strip holes extend along the first direction, and the length of the plurality of second strip holes increases as the distance from the liquid outlet increases; The lengths of the plurality of second annular members along the first direction also increase as the distance from the liquid outlet increases.

10. The battery pack lower shell according to claim 9, characterized in that: When the length of the first annular member along the first direction is greater than or equal to 10 mm, a first reinforcing rib is provided in the first annular member; When the length of the second annular member along the first direction is greater than or equal to 10 mm, a second reinforcing rib is provided in the second annular member.

11. The battery pack lower housing according to claim 10, characterized in that: The first strip-shaped hole has a first inner side wall and a second inner side wall arranged opposite to each other along a third direction, one end of the first reinforcing rib is connected to the first inner side wall, and the other end of the first reinforcing rib is connected to the second inner side wall, and the third direction is perpendicular to the first direction; The second strip-shaped hole has a third inner side wall and a fourth inner side wall that are arranged opposite to each other along the third direction, one end of the second reinforcing rib is connected to the third inner side wall, and the other end of the second reinforcing rib is connected to the fourth inner side wall.

12. A battery pack, characterized in that: It comprises a battery module and a battery pack lower shell as claimed in any one of claims 1 to 11, wherein the battery module is mounted on the battery pack lower shell.

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