Liquid cooling integrated battery box body and power battery pack

Abstract

The invention provides a liquid-cooled integrated battery box body and a power battery pack. A liquid-cooled bottom plate, a front frame, a rear frame, a left side cross beam and a right side cross beam enclose a battery cell accommodating space; a liquid cooling flow channel which is through left and right is arranged in the liquid cooling bottom plate; the liquid cooling bottom plate is connected with the left side cross beam and the right side cross beam; the left side cross beam and the right side cross beam are respectively provided with a front-back through flow guide channel; the flow guide channel of the left side cross beam is communicated with a left side port of the liquid cooling flow channel, and the flow guide channel of the right side cross beam is communicated with a right side port of the liquid cooling flow channel, so that a liquid cooling system of the liquid cooling integrated battery box body is formed. The liquid cooling connection design can be simplified, the design cost is reduced, the internal space of the battery pack is not occupied, and the volume utilization rate of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries and cooling thereof, and in particular to a liquid-cooled integrated battery box. Background Art

[0002] With the continuous development of battery technology in the field of new energy batteries, the application of liquid cooling systems in battery packs is becoming more and more extensive. There are many ways to integrate liquid cooling in traditional battery pack systems, including: the liquid cooling system is independent of the battery case, and in actual application, the liquid cooling plate needs to be connected to the case frame, or the liquid cooling plate needs to be placed inside the battery pack; the other is to integrate the liquid cooling system directly with the battery pack case, and retain a small number of connecting pipes inside the battery pack to reduce the number of parts. Of the above two methods, the former has more connection structures, complex manufacturing, and higher costs, and the latter reduces the utilization rate of the internal space of the battery pack case because it occupies the internal space of the battery pack case.

[0003] Moreover, the liquid cooling flow channel in the liquid cooling plate in the prior art usually adopts a circuitous structure, and flows out after bending and circuiting on the liquid cooling plate. Because of the circuitous structure in the liquid cooling plate, the coolant has to flow a long distance and time on the liquid cooling plate, and even the absorbed heat cannot be taken away in time. For example, if the coolant inlet and outlet are both at the front end of the liquid cooling plate, then the coolant flows from the front end to the rear end, and then flows to the front end at the rear end. Therefore, the shortest flow process in the prior art is twice the length of the liquid cooling plate. Such heat dissipation and cooling effect also needs to be improved. Assuming that there is a situation of forward and backward exit in the prior art, such a design of fluid pipelines will take up space in the front and back, and the practicality is not as high as that of the inlet and outlet on the same side.

[0004] In addition, the traditional liquid cooling channel needs to reserve a welding area, and the channel area accounts for about 60% of the overall area of ​​the battery box bottom plate. The small channel area affects the cooling and heat dissipation effect. Summary of the invention

[0005] Based on the above problems, the present invention provides a liquid-cooled integrated battery box and a power battery pack to solve the above problems.

[0006] A liquid-cooled integrated battery box, which is surrounded by a liquid-cooled bottom plate, a front frame, a rear frame, a left side crossbeam and a right side crossbeam to form a battery cell accommodating space;

[0007] The liquid cooling bottom plate is provided with a liquid cooling channel running through from left to right, and the upper surface of the liquid cooling bottom plate is used to place the battery cells;

[0008] The liquid cooling bottom plate is connected to the left side crossbeam and the right side crossbeam, and both the left side crossbeam and the right side crossbeam have a guide channel that runs through the front and back;

[0009] The guide channel of the left side crossbeam is connected to the left port of the liquid cooling channel, and the guide channel of the right side crossbeam is connected to the right port of the liquid cooling channel to form a liquid cooling system of the liquid-cooled integrated battery box.

[0010] Furthermore, a series of guide holes arranged in the front-to-back direction are provided on the inner side wall of the left side cross beam to connect the guide channel of the left side cross beam with the left port of the liquid cooling channel;

[0011] The inner side wall of the right side cross beam is provided with a series of guide holes arranged in the front-to-back direction to connect the guide channel of the right side cross beam with the right side port of the liquid cooling channel.

[0012] Furthermore, the front frame and the areas corresponding to the front ports of the guide channels of the left side cross beam and the right side cross beam are all provided with front notches;

[0013] An interface component passes through each front notch, a first end of the interface component is communicated with a front end port of the corresponding flow guide channel, and a second end of the interface component is used for connecting an external water pipe.

[0014] Furthermore, the rear frame and the areas corresponding to the rear ports of the guide channels of the left side cross beam and the right side cross beam are all provided with rear notches;

[0015] The rear ports of the guide channels of the left side cross beam and the right side cross beam are respectively blocked by a first end of a plug, and the second end of the plug is accommodated in the corresponding rear notch.

[0016] Furthermore, an energy absorbing structure is provided in the liquid cooling base plate, and the energy absorbing structure is arranged below the liquid cooling flow channel.

[0017] Furthermore, a first weight reduction structure is provided in the liquid cooling base plate, and the first weight reduction structure is arranged below the energy absorbing structure.

[0018] Furthermore, the liquid cooling channel is a first cavity structure arranged in a row in the front-to-back direction and extending from left to right;

[0019] The energy absorbing structure is a row of second cavity structures arranged in the front-to-back direction and extending from left to right;

[0020] The first weight-reducing structure is a row of third cavity structures arranged in the front-to-back direction and extending from left to right;

[0021] The first cavity structure, the second cavity structure and the third cavity structure are arranged one by one in the up and down direction, and their shapes match each other.

[0022] Furthermore, a second weight-reducing structure is provided inside the front frame and the rear frame respectively.

[0023] Furthermore, the left side cross beam and the right side cross beam are respectively provided with a third weight reduction structure.

[0024] A power battery pack is characterized by comprising the aforementioned liquid-cooled integrated battery case, wherein battery cells are placed on the upper surface of the liquid-cooled bottom plate in the battery case.

[0025] The beneficial technical effect of the present invention is that: the present invention hollows out a liquid cooling channel inside the liquid cooling bottom plate of the battery box, and sets a guide channel on the left and right side beams of the battery box. One guide channel introduces the fluid into the liquid cooling channel, and another guide channel leads the fluid out. This can not only simplify the liquid cooling connection design and reduce the design cost, but also does not occupy the internal space of the battery pack and improve the volume utilization of the battery pack. In addition, the cooling channel of the present invention is through from left to right, and the cooling fluid that enters does not need to flow in a circuitous way on the liquid cooling bottom plate to conduct away the heat. It directly enters and exits from left to right, and the heat-conducting fluid flows out quickly, and the cold fluid enters quickly, which greatly improves the cooling effect. It can be seen that the cooling performance of the present invention is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a liquid-cooled integrated battery box of the present invention;

[0027] Figure 2 This is a front elevation view of the left side crossbeam of a liquid-cooled integrated battery box of the present invention;

[0028] Figure 3 This is a front view of the rear end of the left side crossbeam of a liquid-cooled integrated battery box of the present invention;

[0029] Figure 4 This is a front elevation view of the right side crossbeam of a liquid-cooled integrated battery box of the present invention;

[0030] Figure 5 This is a front view of the rear end of the right side crossbeam of a liquid-cooled integrated battery box of the present invention;

[0031] Figure 6 It is a front view of a liquid cooling bottom plate of a liquid cooling integrated battery box of the present invention;

[0032] Figure 7 It is a partial enlarged view C of a liquid-cooled bottom plate of a liquid-cooled integrated battery box of the present invention;

[0033] Figure 8 It is a front view of a front frame of a liquid-cooled integrated battery box of the present invention;

[0034] Fig. 9 It is a front view of a rear frame of a liquid-cooled integrated battery box of the present invention;

[0035] Fig.10 This is a structural schematic diagram of a first interface component of a liquid-cooled integrated battery box of the present invention;

[0036] Fig.11 This is a schematic structural diagram of a second interface component of a liquid-cooled integrated battery box of the present invention;

[0037] Fig.12 It is a structural schematic diagram of a plug of a liquid-cooled integrated battery box of the present invention;

[0038] Fig.13 This is a front view of a battery cell assembly of a liquid-cooled integrated battery box of the present invention;

[0039] Fig.14 A top view of a battery cell assembly of a liquid-cooled integrated battery box of the present invention;

[0040] Fig.15 It is a AA transverse cross-sectional view of a liquid-cooled integrated battery box of the present invention after the battery cells are assembled;

[0041] Fig.16 A cross-sectional view of a BB longitudinal side beam of a liquid-cooled integrated battery box of the present invention after the battery cells are assembled;

[0042] in:

[0043] 1-left side cross beam; 101-first guide channel; 102-first guide hole; 103-inner side wall of left side cross beam; 104-outer side wall of left side cross beam;

[0044] 2-right side cross beam; 201-second guide channel; 202-second guide hole; 203-inner side wall of the right side cross beam; 204-outer side wall of the right side cross beam;

[0045] 3-liquid cooling bottom plate; 301-liquid cooling channel; 302-energy absorbing structure; 303-first weight reduction structure;

[0046] 4-front frame; 401-first notch; 402-second notch;

[0047] 5-rear frame; 501-third notch; 502-fourth notch;

[0048] 6-plug; 601-threaded portion of the plug; 602-fastening portion of the plug;

[0049] 7- Sealing ring;

[0050] 8-first interface component; 801-fastening portion of the first interface component; 802-first end of the first interface component; 803-second end of the first interface component;

[0051] 9-second interface component; 901-fastening portion of the second interface component; 902-first end of the second interface component; 903-second end of the second interface component;

[0052] 10-battery cell; 11-thermal conductive adhesive. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0055] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0056] See also Figure 1 , Figure 6 and Figure 7 The present invention discloses a liquid-cooled integrated battery box, wherein the integrated battery box is composed of a liquid-cooled bottom plate (3), a front frame (4), a rear frame (5), a left side crossbeam (1) and a right side crossbeam (2) to form a battery cell accommodating space;

[0057] A liquid cooling bottom plate (3) is provided with a liquid cooling flow channel (301) running through the left and right sides;

[0058] The liquid cooling bottom plate (3) is connected to a left side crossbeam (1) and a right side crossbeam (2), and both the left side crossbeam (1) and the right side crossbeam (2) have a guide channel that runs through from front to back;

[0059] The guide channel of the left side crossbeam (1) is connected to the left port of the liquid cooling channel (301), and the guide channel of the right side crossbeam (2) is connected to the right port of the liquid cooling channel (301), so as to form a liquid cooling system of the liquid-cooled integrated battery box.

[0060] By hollowing out a liquid cooling channel inside the liquid cooling bottom plate of the battery box, and setting a guide channel on the left and right side beams of the battery box, one guide channel introduces the fluid into the liquid cooling channel, and another guide channel leads the fluid out, which can not only simplify the liquid cooling connection design and reduce the design cost, but also do not occupy the internal space of the battery pack and improve the volume utilization of the battery pack. In addition, the cooling channel of the present invention is through from left to right, and the cooling fluid that enters does not need to flow in a circuitous way on the liquid cooling bottom plate to conduct away the heat, but directly enters and exits from left to right, and the heat-conducting fluid flows out quickly, and the cold fluid enters quickly, which greatly improves the cooling effect. It can be seen that the cooling performance of the present invention is also improved.

[0061] In addition, the flow channel of the present invention is through-through from left to right and drains from the side wall. The liquid cooling base plate is connected to the frame and the side cross beams on the side, so that the area of ​​the liquid cooling flow channel accounts for more than 90% of the overall area of ​​the liquid cooling base plate, greatly improving the heat dissipation efficiency of the battery cells placed on the upper surface of the liquid cooling base plate.

[0062] See also Figure 2-Figure 5 Furthermore, the inner side wall of the left side cross beam (1) is provided with a series of guide holes arranged in the front-to-back direction to connect the guide channel of the left side cross beam (1) with the left side port of the liquid cooling channel (301);

[0063] The inner side wall of the right side cross beam (2) is provided with a series of flow guide holes arranged in the front-to-back direction, so as to connect the flow guide channel of the right side cross beam (2) with the right side port of the liquid cooling channel (301).

[0064] The left side cross beam (1) is provided with a front-to-back through-flow guide channel, namely the first guide channel (101), and the inner side wall (103) is provided with a series of guide holes, namely the first guide holes (102);

[0065] The right side cross beam (2) is provided with a front-to-back through-flow guide channel, namely the second flow guide channel (201), and the inner side wall (203) is provided with a series of flow guide holes, namely the second flow guide holes (202).

[0066] The corresponding flow guide channel and the liquid cooling channel are connected through the flow guide holes.

[0067] The inner side wall (103) of the left side cross beam (1) faces the inside of the battery box, and the outer side wall (104) of the left side cross beam (1) faces the outside of the box.

[0068] The inner side wall (203) of the right side cross beam (2) faces the inside of the battery box, and the outer side wall (204) of the right side cross beam (2) faces the outside of the battery box.

[0069] See also Fig.13 , Fig.14 and Fig.15 Furthermore, the liquid cooling bottom plate (3) is also connected to a front frame (4) and a rear frame (5); the left side cross beam (1), the front frame (4), the right side cross beam (2) and the rear frame (5) are connected at the ends to form a battery cell accommodating space of the battery box with the liquid cooling bottom plate (3); the upper surface of the liquid cooling bottom plate (3) is used to place the battery cell (10).

[0070] The inner side wall of the front frame (4) faces the inside of the battery box, and the outer side wall of the front frame (4) faces the outside of the battery box.

[0071] The inner side wall of the rear frame (5) faces the inside of the battery box, and the outer side wall of the rear frame (5) faces the outside of the battery box.

[0072] Furthermore, the upper end surface of the liquid cooling base plate (3) is used to place the battery cell (10), and the thermal conductive adhesive (11) can be first coated on the upper end surface of the liquid cooling base plate (3), and then the battery cell (10) can be placed.

[0073] As an embodiment of the present invention, the first guide channel (101) is a liquid inlet channel, and the second guide channel (201) is a liquid outlet channel. After the low-temperature cooling liquid enters the first guide channel (101), it is introduced into the left port (here, the liquid inlet) of the liquid cooling channel (301) through the first guide hole (102). After the cooling liquid passes through the liquid cooling channel (301) and absorbs the heat generated by the battery cell, it flows out from the right port (here, the liquid outlet) of the liquid cooling channel (301), and is introduced into the second guide channel (201) through the second guide hole (202). Then, the cooling liquid that absorbs the heat flows out from the second guide channel (201).

[0074] Furthermore, the first flow guide hole (102) is located in the height direction within the projection area of ​​the left side port of the liquid cooling channel (301) on the liquid cooling bottom plate (3) of the battery box on the left side crossbeam (1).

[0075] Furthermore, the second guide hole (202) is located in the height direction within the projection area of ​​the right side port of the liquid cooling channel (301) on the liquid cooling bottom plate (3) of the battery box on the right side crossbeam (2).

[0076] See also Figure 8 , Fig.10 , Fig.11 and Fig.16 Furthermore, the front frame (4) and the areas corresponding to the front ports of the guide channels of the left side cross beam (1) and the right side cross beam (2) are all provided with front notches;

[0077] An interface component passes through each front notch, a first end of the interface component is communicated with a front end port of the corresponding flow guide channel, and a second end of the interface component is used for connecting an external water pipe.

[0078] The interface component corresponding to the front port of the first flow guiding channel (101) is the first interface component (8), and the interface component corresponding to the front port of the second flow guiding channel (201) is the second interface component (9).

[0079] The front notch of the front frame (4) opened in the area corresponding to the front end of the first flow guiding channel (101) is the first notch (401), and the front notch opened in the area corresponding to the front end of the second flow guiding channel (201) is the second notch (402);

[0080] The first end (802) of the first interface component (8) is connected to the threaded portion of the front port of the first flow guiding channel (101), and the second end (803) of the first interface component (8) passes through the first notch (401) to expose the outer side wall of the front frame (4);

[0081] The first end (902) of the second interface component (9) is connected to the threaded portion of the front port of the second guide channel (201), and the second end (903) of the second interface component (9) passes through the second notch (402) to expose the outer side wall of the front frame (4).

[0082] The first end (802) of the first interface component (8) is connected to the front end of the first flow guiding channel (101), and the second end (803) is used to connect to an external water pipe to achieve coolant conduction between the water pipe and the first flow guiding channel (101). The first end (802) of the first interface component (8) is an external thread, and the threaded portion of the front end of the first flow guiding channel (101) is a thread groove, forming an internal thread, and is connected to the first end (802) of the first interface component (8) by threading. A sealing ring (7) is also provided, and the fastening portion (801) of the first interface component (8) is pressed against the front end of the first flow guiding channel (101) through the sealing ring (7) to achieve sealing and prevent coolant leakage.

[0083] The size of the first notch (401) is greater than the maximum circumscribed circle diameter formed by the fastening portion (801) of the first interface component (8), so as to accommodate the fastening portion (801) of the first interface component (8).

[0084] Preferably, the first notch (401) may be a square notch.

[0085] The first end (902) of the second interface component (9) is connected to the front end of the second flow guiding channel (201), and the second end (903) is used to connect to an external water pipe to achieve the coolant conduction between the water pipe and the second flow guiding channel (201). The first end (902) of the second interface component (9) is an external thread, and the threaded portion of the front end of the second flow guiding channel (201) is a thread groove, forming an internal thread, and is connected to the first end (902) of the second interface component (9) by a threaded manner. A sealing ring (7) is also provided, and the fastening portion (901) of the second interface component (9) is pressed against the front end of the second flow guiding channel (201) through the sealing ring (7) to achieve sealing and prevent coolant leakage.

[0086] The size of the second notch (402) is greater than the maximum circumscribed circle diameter formed by the fastening portion (901) of the second interface component (9), so as to accommodate the fastening portion (901) of the second interface component (9).

[0087] Preferably, the second notch (402) may be a square notch.

[0088] See also Fig. 9 and Fig.12 Furthermore, the rear frame (5) and the areas corresponding to the rear ports of the guide channels of the left side cross beam (1) and the right side cross beam (2) are all provided with rear notches;

[0089] The rear ports of the flow guide channels of the left side cross beam (1) and the right side cross beam (2) are blocked by the first end of a plug (6), respectively, and the second end of the plug (6) is accommodated in the corresponding rear notch.

[0090] The first end of the plug (6) is a threaded portion (602), and the second end is a fastening portion (601); the threaded portion (602) of one plug (6) is connected to the threaded portion of the rear port of the first flow guide channel (101), and the threaded portion (602) of the other plug (6) is connected to the threaded portion of the rear port of the second flow guide channel (201).

[0091] The threaded portion (602) of the plug (6) is an external thread, and the threaded portion of the rear port of the first guide channel (101) is a thread groove, forming an internal thread, which is connected to the plug (6) by a threaded manner. A sealing ring (7) is also provided, and the fastening portion (602) of the plug (6) is pressed against the rear port of the first guide channel (101) through the sealing ring (7) to achieve sealing and prevent the coolant from flowing out of the rear port of the first guide channel (101).

[0092] Similarly, the threaded portion of the rear port of the second flow guiding channel (201) is also a threaded groove, forming an internal thread, which is connected to the plug (6) by a threaded manner. A sealing ring (7) is also provided, and the fastening portion (602) of the plug (6) is pressed against the rear port of the second flow guiding channel (201) through the sealing ring (7) to achieve sealing and prevent the coolant from flowing out of the rear port of the second flow guiding channel (201).

[0093] The rear frame (5) has a rear notch, namely a third notch (501), opened in an area corresponding to the rear port of the first flow guiding channel (101), and a rear notch, namely a fourth notch (502), opened in an area corresponding to the front port of the second flow guiding channel (201);

[0094] The third notch (501) and the fourth notch (502) accommodate the corresponding fastening portions (601) of the plug (6).

[0095] Furthermore, the size of the third notch (501) is larger than the maximum circumscribed circle diameter formed by the fastening portion (601) of the plug (6), so as to accommodate the fastening portion (601) of the plug (6).

[0096] Preferably, the third notch (501) may be a square notch.

[0097] Furthermore, the size of the fourth notch (502) is larger than the maximum circumscribed circle diameter formed by the fastening portion (601) of the plug (6), so as to accommodate the fastening portion (601) of the plug (6).

[0098] Preferably, the fourth notch (502) may be a square notch.

[0099] Furthermore, the thickness of the fastening portion (601) of the plug (6) is less than or equal to 6 mm, and the effective length of the thread of the threaded portion (602) of the plug (6) is within a range of 5 pitches.

[0100] The effective length of the internal threads of the threaded parts of the front port and the rear port of the first flow guiding channel (101) and the front port and the rear port of the second flow guiding channel (201) is greater than or equal to 5 pitch ranges.

[0101] Furthermore, the first end (802) of the first interface component (8) serves as a threaded portion, and the effective length of the thread is within a range of 5 pitches.

[0102] Furthermore, the thickness of the fastening portion (801) of the first interface component (8) is less than or equal to 6 mm.

[0103] Furthermore, the first end (902) of the second interface component (9) serves as a threaded portion, and the effective length of the thread is within a range of 5 pitches.

[0104] Furthermore, the thickness of the fastening portion (901) of the second interface component (9) is less than or equal to 6 mm.

[0105] Furthermore, the thickness of the fastening portion (601) of the plug (6) is less than or equal to 6 mm, and the effective length of the thread of the threaded portion (602) of the plug (6) is within a range of 5 pitches.

[0106] See also Figure 7 Furthermore, an energy absorbing structure (302) is provided in the liquid cooling bottom plate, and the energy absorbing structure (302) is arranged below the liquid cooling channel (301).

[0107] The energy absorbing structure (302) is a hollow structure that runs through the left and right sides, and can be deformed to absorb energy when the bottom is hit.

[0108] Furthermore, a first weight reduction structure (303) is provided in the liquid cooling bottom plate (3), and the first weight reduction structure (303) is arranged below the energy absorption structure (302). That is, the liquid cooling flow channel (301), the energy absorption structure (302), and the first weight reduction structure (303) are distributed from top to bottom in the height direction.

[0109] Specifically, the liquid cooling channel (301) is a first cavity structure arranged in a row in the front-to-back direction and extending from left to right;

[0110] The energy absorbing structure (302) is a row of second cavity structures arranged in the front-to-back direction and extending from left to right;

[0111] The first weight reduction structure (303) is a row of third cavity structures arranged in the front-to-back direction and extending from left to right;

[0112] The first cavity structure, the second cavity structure and the third cavity structure are arranged one by one in the up and down direction, and their shapes match each other.

[0113] The shapes of the first cavity structure, the second cavity structure, and the third cavity structure are matched. For example, the lower half of the first cavity structure is arc-shaped, the cross-section of the third cavity structure is circular, and the second cavity structure is sandwiched between the first cavity structure and the third cavity structure to form a waist shape. The upper arc of the waist shape follows the arc design of the lower half of the first cavity structure, and the lower arc of the waist shape follows the shape of the upper half of the third cavity structure. In this way, the upper and lower correspond to each other and the shape is matched. They are all cavity structure designs, which enhance the energy absorption effect of the battery box and greatly reduce the weight of the battery box. Furthermore, the front frame (4) and the rear frame (5) are respectively provided with a second weight reduction structure inside.

[0114] Furthermore, the left side cross beam (1) and the right side cross beam (2) are respectively provided with a third weight reduction structure.

[0115] Specifically, the first weight-reducing structure and the second weight-reducing structure are both cavity structures. By providing the weight-reducing cavity structure, the weight of the battery box is reduced.

[0116] Furthermore, the side edges of the liquid cooling base plate (3) are connected to the left side crossbeam (1), the right side crossbeam (2), the front frame (4) and the rear frame (5) respectively by welding.

[0117] The front end of the left side cross beam (1) and the left end of the front frame (4) are welded together, and the rear end (also the tail end) of the left side cross beam (1) and the left end of the rear frame (5) are welded together.

[0118] The front end of the right side cross beam (2) and the right end of the front frame (4) are welded together, and the rear end (also the tail end) of the right side cross beam (2) and the right end of the rear frame (5) are welded together.

[0119] By welding, compared with the prior art method in which the liquid cooling plate and the battery bottom plate are designed separately and need to be fixed to the bottom plate by screwing, the liquid cooling plate and the battery bottom plate of the present invention are integrated into one, and only one step of welding is required to connect with the frame, which greatly improves the manufacturing efficiency.

[0120] The present invention also provides a power battery pack, comprising the aforementioned liquid-cooled integrated battery box, wherein a battery cell (10) is placed on the upper surface of a liquid-cooled bottom plate (3) in the battery box.

[0121] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid-cooled integrated battery box, characterized in that: The integrated battery box is surrounded by a liquid cooling bottom plate, a front frame, a rear frame, a left side crossbeam and a right side crossbeam to form a battery cell accommodating space; The liquid cooling bottom plate is provided with a liquid cooling channel running through the left and right sides, and the upper surface of the liquid cooling bottom plate is used for placing the battery core; The liquid cooling bottom plate is connected to the left side crossbeam and the right side crossbeam, and the left side crossbeam and the right side crossbeam each have a guide channel that runs through the front and back; The guide channel of the left side crossbeam is connected to the left port of the liquid cooling channel, and the guide channel of the right side crossbeam is connected to the right port of the liquid cooling channel to form a liquid cooling system for the liquid-cooled integrated battery box.

2. A liquid-cooled integrated battery box as claimed in claim 1, characterized in that: The inner side wall of the left side cross beam is provided with a series of guide holes arranged in the front-to-back direction to connect the guide channel of the left side cross beam with the left port of the liquid cooling channel; The inner side wall of the right side cross beam is provided with a series of guide holes arranged in the front-to-back direction to connect the guide channel of the right side cross beam with the right side port of the liquid cooling channel.

3. A liquid-cooled integrated battery box as claimed in claim 1, characterized in that: The front frame and the areas corresponding to the front ports of the guide channels of the left side cross beam and the right side cross beam are all provided with front notches; An interface component passes through each of the front notches, a first end of the interface component is communicated with a corresponding front port of the diversion channel, and a second end of the interface component is used for connecting an external water pipe.

4. The liquid-cooled integrated battery box according to claim 1, characterized in that: The rear frame and the areas corresponding to the rear ports of the guide channels of the left side cross beam and the right side cross beam are all provided with rear notches; The rear ports of the guide channels of the left side cross beam and the right side cross beam are respectively blocked by a first end of a plug, and the second end of the plug is accommodated in the corresponding rear notch.

5. The liquid-cooled integrated battery box according to claim 1, characterized in that: An energy absorbing structure is provided in the liquid cooling base plate; The energy absorbing structure is arranged below the liquid cooling channel.

6. A liquid-cooled integrated battery box as claimed in claim 5, characterized in that: A first weight reduction structure is also provided in the liquid cooling base plate, and the first weight reduction structure is arranged below the energy absorbing structure.

7. A liquid-cooled integrated battery box as claimed in claim 6, characterized in that: The liquid cooling channel is a first cavity structure arranged in a row in the front-to-back direction and extending from left to right; The energy absorbing structure is a row of second cavity structures arranged in the front-to-back direction and extending from left to right; The first weight-reducing structure is a row of third cavity structures arranged in the front-to-back direction and extending from left to right; The first cavity structure, the second cavity structure and the third cavity structure are arranged one by one in the up and down direction, and their shapes match each other.

8. The liquid-cooled integrated battery box according to claim 1, characterized in that: A second weight-reducing structure is respectively provided inside the front frame and the rear frame.

9. The liquid-cooled integrated battery box according to claim 1, characterized in that: The left side cross beam and the right side cross beam are respectively provided with a third weight reduction structure.

10. A power battery pack, characterized in that: It comprises a liquid-cooled integrated battery case as described in any one of claims 1 to 9, wherein a battery cell is placed on the upper surface of the liquid-cooled bottom plate in the battery case.

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