Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack. The battery box comprises a box body provided with a first containing cavity and a supporting assembly located in the first containing cavity. Wherein the box body comprises a bottom plate defining the bottom of a first containing cavity, the supporting assembly comprises a first flow channel plate and a plurality of reinforcing plates, and the first flow channel plate is provided with a first flow channel used for circulating a cooling medium. Each reinforcing plate is connected to the first runner plate and is fixed on the bottom plate; every two adjacent battery cells and the corresponding reinforcing plates jointly define a flow channel cavity, the flow channel cavities are communicated with the flow channels, and each battery cell is clamped between the two adjacent reinforcing plates. Compared with the prior art, the battery box can clamp and fix a plurality of battery cells and simplify the structure, so that the weight of the battery box is reduced, meanwhile, the cooling medium can be in full contact with the outer side surfaces of the battery cells, the cooling effect of the battery cells is better, and the structure of the battery box can be increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a battery box and battery pack. BACKGROUND

[0002] In the related art, the two ends of the battery cell in the battery box are often fixed by the end plate, on the one hand, the end plate will occupy the volume of the battery box, resulting in the weight of the battery box being heavy, on the other hand, the end plate is located on the outer side of the battery cell, so that the cooling medium cannot fully contact the outer side of the battery cell, thus resulting in the outer side of the battery cell cannot be effectively cooled. SUMMARY

[0003] The embodiments of the utility model provide a battery box and battery pack, can solve the above-mentioned problem that the weight of the battery box is heavy and the outer side of the battery cell cannot be fully contacted with the cooling medium due to the existence of the end plate.

[0004] In a first aspect, the embodiments of the utility model provide a battery box, which comprises:

[0005] The box body is provided with a first containing cavity to install a plurality of battery cells, and comprises a bottom plate surrounding the bottom of the first containing cavity, which is used to support the bottom of the battery cell; and

[0006] The support assembly is located in the first containing cavity and comprises a first flow channel plate and a plurality of reinforcing plates, the first flow channel plate is close to the end of the battery cell and is provided with a first flow channel for circulating the cooling medium;

[0007] Each reinforcing plate is connected to the first flow channel plate and fixed to the bottom plate; the side surface of each adjacent two battery cells and the corresponding reinforcing plate jointly surround a flow channel cavity, and the flow channel cavity is communicated with the first flow channel; and each battery cell is clamped between the adjacent two reinforcing plates.

[0008] In an embodiment, the inner side of the first flow channel plate is further provided with a plurality of first flow channel plates, each flow channel plate is provided with a first flow channel opening to make the corresponding flow channel cavity communicated with the first flow channel through the first flow channel opening, and each battery cell is further clamped between the adjacent two flow channel plates.

[0009] In an embodiment, one end of the first flow channel plate is provided with an inlet communicated with the first flow channel, in the direction of the one end of the first flow channel plate pointing to the other end of the first flow channel plate, the plurality of first flow channel openings sequentially comprise a plurality of first flow channel openings in the front part, a plurality of first flow channel openings in the middle part and a plurality of first flow channel openings in the rear part; the box body has a first side plate, in the plurality of first flow channel openings in the middle part, the height of the first flow channel opening close to one end of the first side plate is less than the height of the first flow channel opening close to the other end of the first side plate.

[0010] In an embodiment, in the plurality of first flow channel openings in the front portion, the heights of two adjacent first flow channel openings are equal and are each less than the height of the first flow channel opening near one end of the first flow channel opening plate in the plurality of first flow channel openings in the middle portion; in the plurality of first flow channel openings in the rear portion, the heights of two adjacent first flow channel openings are equal and are each greater than the height of the first flow channel opening near the other end of the first flow channel opening plate in the plurality of first flow channel openings in the middle portion.

[0011] In an embodiment, the support assembly further comprises a second flow channel plate opposite the first flow channel plate, one end of the second flow channel plate is arranged opposite one end of the first flow channel plate, the other end of the second flow channel plate is arranged opposite the other end of the first flow channel plate, the other end of the second flow channel plate is provided with an outlet, the second flow channel plate is provided with a second flow channel for flowing of the cooling medium, and the inner side of the second flow channel plate is mounted with a plurality of second flow channel plates, each second flow channel plate is provided with a second flow channel opening, and the outlet of the second flow channel plate is communicated with the plurality of flow channel cavities through the second flow channel and the plurality of second flow channel openings of the plurality of second flow channel plates.

[0012] In an embodiment, the width of the first flow channel opening is equal to the width of the second flow channel opening and the width of the reinforcing plate.

[0013] In an embodiment, the reinforcing plate is integrally formed with the first flow channel opening plate and the second flow channel opening plate.

[0014] In a second aspect, embodiments of the utility model provide a battery pack comprising a plurality of battery boxes according to the first aspect and a plurality of battery cells.

[0015] In an embodiment, the plurality of battery cells comprises a plurality of battery cell groups arranged along the length direction of the first flow channel opening plate, the plurality of battery cells of each battery cell group are arranged along the length direction of the plurality of reinforcing plates, and 1 / 9≤W1 / L1≤1 / 6; wherein W1 is the width of the first flow channel opening, and L1 is the length of the battery cell group.

[0016] In an embodiment, the plurality of battery cells comprises a plurality of battery cell groups arranged along the length direction of the box body, the plurality of battery cells of each battery cell group are arranged along the length direction of the plurality of reinforcing plates, and 1 / 230≤L2 / L1≤1 / 115; wherein L1 is the length of the battery cell group, and L2 is the length of the first flow channel opening plate.

[0017] The utility model provides a kind of battery box and battery pack, battery box includes the box body being equipped with first containing cavity and the support assembly in first containing cavity. Among them, the box body includes the bottom plate of the bottom of the first containing cavity, support assembly includes first flow channel plate and multiple reinforcing plates, first flow channel plate is equipped with the first flow channel for the circulation cooling medium. Every reinforcing plate is connected to first flow channel plate and is fixed to bottom plate;Every two adjacent battery cells and corresponding reinforcing plate jointly enclose flow channel cavity, and flow channel cavity is communicated flow channel, and every battery cell is clamped between two adjacent reinforcing plates. The battery box provided by the utility model can clamp multiple battery cells, and can also be used to enclose flow channel cavity with battery cell, and can also be connected between bottom plate and first support plate as structural reinforcing member. Compared with the related art, the battery box can realize the clamping and fixing of multiple battery cells, simplify the structure, thus reduce the weight of battery box, and also enable cooling medium to fully contact the outer side of battery cell, so that the cooling effect of battery cell is better, and the structural strength of battery box is also increased. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 It is the structural schematic diagram of battery box provided by the utility model embodiment;

[0020] Figure 2 It is Figure 1 sectional view;

[0021] Figure 3 It is Figure 1 explosion diagram;

[0022] Figure 4 It is Figure 3 sectional view of support assembly in it;

[0023] Figure 5 It is Figure 4 sectional view;

[0024] Figure 6 It is Figure 5 front view;

[0025] Figure 7 It is Figure 5 side view;

[0026] Figure 8 It is Figure 2 sectional view;

[0027] Reference signs:

[0028] 100, battery box; 101, box body; 102, first containing cavity; 200, battery cell; 310, first flow channel plate; 311, reinforcing plate; 312, first flow channel; 313, first flow channel port plate; 314, first flow channel port; 330, inlet; 340, second flow channel plate; 341, second flow channel; 342, second flow channel port plate; 343, second flow channel port; 350, outlet. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing in the drawings. And "inner" and "outer" are relative to the outline of the device.

[0030] In order to solve the problem that the weight of the battery box is heavy and the outer side surface of the battery cell cannot be fully contacted with the cooling medium due to the existence of the end plate, the embodiments of the present application provide a battery box 100, which can be referred to as Figures 1 to 4 , Figure 1 is a structural schematic diagram of the battery box 100 provided by the embodiments of the present application, Figure 2 is a sectional view of Figure 1 , Figure 3 is an exploded view of Figure 1 , Figure 4 is a sectional view of Figure 3Figure 2 is a sectional view of the support assembly in the battery box. The battery box 100 comprises a box body 101 provided with a first accommodating cavity 102 for placing a plurality of battery cells 200, and a support assembly located in the first accommodating cavity 102, which comprises a first flow channel plate 310 close to the end of the battery cell 200 and provided with a first flow channel 312 for flowing cooling medium, and a plurality of reinforcing plates 311. The box body 101 comprises a bottom plate surrounding the bottom of the first accommodating cavity 102 for supporting the bottom of the plurality of battery cells 200. Each reinforcing plate 311 is connected to the flow channel port plate and fixed to the bottom plate, and collectively surrounds a plurality of limiting structures. The plurality of battery cells 200 are respectively placed in the corresponding limiting structures, so that each battery cell 200 is clamped between two adjacent reinforcing plates 311. Meanwhile, two adjacent battery cells 200 and the corresponding reinforcing plate 311 collectively surround a flow channel cavity, and the flow channel cavity is in communication with the first flow channel 312.

[0031] The battery box 100 provided by the embodiment can make the plurality of battery cells 200 clamped between two adjacent reinforcing plates 311 through the limiting structure surrounded by the reinforcing plate 311 and the first flow channel plate 310. Compared with the related art, the structure of the battery box 100 is simpler, and the volume and weight of the battery box 100 can be optimized to a certain extent, and the cooling medium can be ensured to fully contact the outer side of the battery cell 200, so that the cooling effect of the battery cell 200 is better.

[0032] In some embodiments, reference can be made to Figure 3 and Figure 4 The inner side of the first flow channel plate 310 is further provided with a plurality of first flow channel port plates 313 arranged along the length direction of the first flow channel plate 310, and each flow channel port plate is provided with a first flow channel port 314, so that the corresponding flow channel cavity is in communication with the first flow channel 312 through the corresponding first flow channel port 314, and each battery cell 200 is further clamped between two adjacent flow channel port plates.

[0033] In the embodiment, the plurality of first flow channel port plates 313 located on the inner side of the first flow channel plate 310 can, on the one hand, play a role in guiding the cooling medium to a certain extent through the corresponding first flow channel port 314 of the plurality of first flow channel port plates 313, so that the flow direction of the cooling medium is more regular, and the cooling effect of the battery cell 200 is better. On the other hand, the plurality of first flow channel port plates 313 can cooperate with the corresponding reinforcing plate 311 to jointly fix the battery cell 200, that is, the plurality of first flow channel port plates 313 fix the upper part of the battery cell 200, and the corresponding reinforcing plate 311 fixes the lower part of the battery cell 200, so that the structure of the plurality of battery cells 200 in the battery box 100 is more stable.

[0034] In some embodiments, reference can be made to Figure 3, one end of the first flow channel plate 310 is provided with an inlet 330 communicating with the first flow channel 312, so that the external cooling medium source can transport the cooling medium to the first flow channel 312 through the inlet 330, and then to the plurality of flow channel cavities through the first flow channel port 314 to dissipate heat for the plurality of battery cells 200. In the direction in which the one end of the first flow channel plate 310 provided with the inlet 330 points to the other end of the first flow channel plate 310, there are a plurality of first flow channel ports 314, and the plurality of first flow channel ports 314 sequentially include a plurality of first flow channel ports 314 in the front portion, a plurality of first flow channel ports 314 in the middle portion, and a plurality of first flow channel ports 314 in the rear portion. In the plurality of first flow channel ports 314 in the middle portion, the box 101 has a first side plate, and the height of the flow channel port close to the one end of the first side plate provided with the inlet 330 is less than the height of the flow channel port close to the other end of the first side plate.

[0035] Specifically, through simulation experiments, it is obtained that when the height of the flow channel port close to the one end of the first side plate provided with the inlet 330 is set to be less than the height of the flow channel port close to the other end of the first side plate in the plurality of first flow channel ports 314 in the middle portion in the direction in which the one end of the first flow channel plate 310 provided with the inlet 330 points to the other end of the first flow channel plate 310, that is, the height of the first flow channel port 314 close to the one end of the inlet 330 is lower, and the height of the first flow channel port 314 away from the one end of the inlet 330 is higher, the area of the first flow channel port 314 sequentially increases, which can better allocate the flow rate of the cooling liquid flowing between the flow channel cavities, ensure that the battery cells 200 away from the one end of the inlet 330 can also be fully cooled, and make the temperature of each battery cell 200 in the battery box 100 more uniform.

[0036] In some embodiments, on the basis of the above-mentioned embodiments, in the plurality of first flow channel ports 314 in the front portion, the heights of two adjacent first flow channel ports 314 are equal and are less than the height of the first flow channel port 314 close to the one end of the first flow channel plate 310 provided with the inlet 330 in the plurality of first flow channel ports 314 in the middle portion; and in the plurality of first flow channel ports 314 in the rear portion, the heights of two adjacent first flow channel ports 314 are equal and are greater than the height of the first flow channel port 314 close to the other end of the first flow channel plate 310 in the plurality of first flow channel ports 314 in the middle portion.

[0037] Specifically, through simulation experiments, it is obtained that by designing the two adjacent first flow channel ports 314 in the plurality of first flow channel ports 314 in the front portion to have equal heights, compared with designing the two adjacent first flow channel ports 314 in the plurality of first flow channel ports 314 in the front portion to have increasing heights, the test data obtained under this design shows that the highest temperature of the plurality of battery cells 200 in the battery box 100 is lower, that is, the heat dissipation effect of the battery box 100 is better.

[0038] In some embodiments, reference can be made to Figure 3 and Figure 4The support assembly further comprises a second flow channel plate 340 opposite the first flow channel plate 310, one end of the second flow channel plate 340 is arranged opposite the end of the first flow channel plate 310 provided with the inlet 330, the other end of the second flow channel plate 340 is arranged opposite the other end of the first flow channel plate 310, the other end of the second flow channel plate 340 is provided with an outlet 350, and the second flow channel plate 340 is provided with a second flow channel 341 for flowing the cooling medium and communicating with the outlet 350, a plurality of second flow channel port plates 342 are mounted on the inner side of the second flow channel plate 340 close to the first flow channel plate 310, and each second flow channel port plate 342 is provided with a second flow channel port 343, so that the outlet 350 of the second flow channel plate 340 communicates with the plurality of flow channel cavities through the second flow channel 341 and the plurality of second flow channel ports 343 of the plurality of second flow channel port plates 342.

[0039] Specifically, first, the cooling medium flows from the external cooling medium source into the first flow channel 312 through the inlet 330 on the first flow channel plate 310, then flows into each flow channel cavity between the plurality of battery cells 200 through the plurality of first flow channel ports 314 on the first flow channel plate 310, then flows into the second flow channel 341 through the corresponding second flow channel port 343 communicating with each flow channel cavity, and finally flows out from the second flow channel 341 through the outlet 350 on the second flow channel plate 340. Compared with arranging the outlet 350 at the end of the second flow channel plate 340 close to the inlet 330 of the first flow channel plate 310, arranging the outlet 350 at the end of the second flow channel plate 340 away from the inlet 330 of the first flow channel plate 310 can ensure that the cooling medium is in sufficient contact with the battery cells 200, so that the heat dissipation effect of the battery box 100 is better.

[0040] In some embodiments, the width of the first flow channel port 314 is equal to the width of the second flow channel port 343 and the width of the reinforcing plate 311. On the one hand, under the condition that the height of the first flow channel port 314 and the height of the second flow channel port 343 are constant, if the width of the first flow channel port 314 is equal to the width of the second flow channel port 343 and the width of the reinforcing plate 311, the opening area of the first flow channel port 314 and the second flow channel port 343 is maximum at this time, and the amount of cooling medium passing through the first flow channel port 314 and the second flow channel port 343 per unit time is also maximum, that is, the heat dissipation effect of the battery cell 200 is best at this time. On the other hand, at this time, the width of the reinforcing plate 311 is equal to the width of the first flow channel port plate 313 and the second flow channel port plate 342, and the force acting on the battery cell 200 is also more uniform, so that the position structure of the battery cell 200 is more stable.

[0041] In some embodiments, the reinforcing plate 311 is integrally formed with the first flow channel opening plate 313 and the second flow channel opening plate 342. Compared with welding the reinforcing plate 311 on the first flow channel opening plate 313 and the second flow channel opening plate 342 by welding or the like, the integrally formed structure does not have cracks caused by welding, and thus the support assembly has higher strength and durability. Meanwhile, the integrally formed structure can reduce the steps and manual operations in the production process, and thus the production efficiency is higher.

[0042] In some embodiments, one end of the first flow channel opening plate 313 is provided with an inlet 330 communicating with the first flow channel 312. In the direction from the one end of the first flow channel opening plate 313 to the other end of the first flow channel opening plate 313, the plurality of first flow channel openings 314 sequentially include the plurality of first flow channel openings 314 in the front portion, the plurality of first flow channel openings 314 in the middle portion, and the plurality of first flow channel openings 314 in the rear portion. Among the plurality of flow channel openings in the middle portion, the height of the first flow channel opening 314 close to the one end of the first side plate is smaller than the height of the first flow channel opening 314 close to the other end of the first side plate. The heights of the plurality of first flow channel openings 314 on the second flow channel opening plate 342 are equal.

[0043] In some embodiments, the cooling medium described above can be a hydrocarbon alkane cooling liquid. The hydrocarbon alkane cooling liquid has excellent electrical insulation and chemical inertness, and is non-toxic and harmless. Compared with traditional fluorinated liquid, the density of the hydrocarbon alkane cooling liquid is smaller, and the price is cheaper. In addition, the hydrocarbon alkane cooling liquid has smaller dynamic viscosity, which ensures good flowability, so that the heat exchange efficiency of the plurality of battery cells 200 in the battery box 100 is better, and the thermal conductivity is larger, so that the heat exchange capacity is also stronger.

[0044] The utility model provides a kind of battery box 100, which comprises a box body 101 provided with a first accommodating cavity 102 and a support assembly located in the first accommodating cavity 102. The box body 101 includes a bottom plate enclosing the bottom of the first accommodating cavity 102, and the support assembly includes a first flow channel plate 310 and a plurality of reinforcing plates 311. The first flow channel plate 310 is provided with a first flow channel 312 for circulating cooling medium. Each reinforcing plate 311 is connected to the first flow channel plate 310 and fixed to the bottom plate. Each adjacent two battery cells 200 and the corresponding reinforcing plate 311 jointly enclose a flow channel cavity, and the flow channel cavity is communicated with the flow channel. Each battery cell 200 is clamped between two adjacent reinforcing plates 311. The battery box 100 provided by the utility model clamps a plurality of battery cells 200 by the limiting structure enclosed between the reinforcing plate 311 and the first flow channel plate 310. Compared with the related art, the battery box 100 does not need to additionally provide an end plate to fix a plurality of battery cells 200, thereby reducing the weight of the battery box 100, and enabling the cooling medium to fully contact the outer side of the battery cell 200, so that the cooling effect of the battery cell 200 is better.

[0045] The utility model embodiment further provides a battery pack, the battery pack includes a plurality of above -mentioned battery box 100 and a plurality of electric core 200.

[0046] In some embodiments, reference can be made to Figures 5 to 8 , Figure 5 Figure 4 is the sectional view of Figure 6 is the front view of Figure 5 , Figure 7 is the side view of Figure 5 , Figure 8 is the sectional view of Figure 2 . Multiple electric core 200 include along the length direction of first flow channel board 310 multiple electric core groups, and the multiple electric core 200 of each electric core group is arranged along the length direction of multiple reinforcing plates 311, and 1 / 9≤W1 / L1≤1 / 6;Wherein, W1 is the width of first flow channel mouth 314, and L1 is the length of electric core group.

[0047] Specifically, the width of first flow channel mouth 314, second flow channel mouth 343 influences the amount of cooling medium through flow channel cavity in unit time, and simulation experiment obtains, if the ratio of the width W1 of first flow channel mouth 314 and the length L1 of electric core group is less than 1 / 9, at this time, the width W1 of first flow channel mouth 314 is narrow, and the amount of cooling medium through flow channel cavity in unit time is less, thereby leading to the heat dissipation efficiency of electric core 200 is lower.If the ratio of the width W1 of first flow channel mouth 314 and the length L1 of electric core group is greater than 1 / 6, at this time, the width W1 of first flow channel mouth 314 is wide, makes multiple flow channel cavities in battery box 100 the volume occupied is larger, leads to the space utilization of battery box 100 is lower, simultaneously because the amount of cooling medium in unit time through inlet 330 transmission to first flow channel 312 is certain, therefore the amount of cooling medium dispersed to each flow channel cavity is also certain, when the width W1 of first flow channel mouth 314 is too wide, will lead to the flow velocity of cooling medium in flow channel cavity is lower, thereby influence the heat dissipation efficiency of electric core 200.Therefore when the ratio of the width W1 of first flow channel mouth 314 and the length L1 of electric core group is between 1 / 9 and 1 / 6, the heat dissipation efficiency of electric core 200 is higher and the space utilization of battery box 100 is also higher.

[0048] In some embodiments, multiple electric core 200 include along the length direction of box body 101 multiple electric core groups, and the multiple electric core 200 of each electric core group is arranged along the length direction of multiple reinforcing plates 311, and 1 / 230≤L2 / L1≤1 / 115;Wherein, L1 is the length of electric core group, and L2 is the length of first flow channel mouth plate 313.

[0049] ​Specifically, if the length L1 of the first flow channel opening plate 313 is too short, the effect of fixing the battery cell group by the first flow channel opening plate 313 will be affected and the manufacturing will be inconvenient, and if the length L1 of the first flow channel opening plate 313 is too long, the area of the abutment between the first flow channel opening plate 313 and the battery cell group will be too large, so that the battery cell group cannot be in full contact with the cooling medium, thereby affecting the heat dissipation effect of the battery cell group. Through simulation experiments, it can be obtained that when the ratio of the length L1 of the battery cell group to the length L2 of the first flow channel opening plate 313 is between 1 / 230 and 1 / 115, the heat dissipation effect of the battery cell group can be guaranteed, and the fixing effect of the battery cell group can also be guaranteed.

[0050] The battery pack comprises a plurality of the battery boxes 100 and a plurality of the battery cells 200, and has all the advantages of the battery box 100.

[0051] The above detailed the embodiments of the utility model, the principle and implementation mode of the utility model are described by applying specific examples in this paper, the above embodiment is only for helping understanding the method and core thought of the utility model; meanwhile, for the person skilled in the art, according to the thought of the utility model, the specific implementation mode and application range will have the change, and the above is not understood as the limitation of the utility model.

Claims

1. A battery box characterized by, The battery box comprises: a box body provided with a first accommodating cavity for mounting a plurality of battery cells and comprising a bottom plate surrounding a bottom of the first accommodating cavity, the bottom plate being used for supporting the bottom of the battery cells; and a supporting assembly located in the first accommodating cavity and comprising a first flow channel plate and a plurality of reinforcing plates, the first flow channel plate being close to an end of the battery cells and provided with a first flow channel for flowing cooling medium; wherein each of the reinforcing plates is connected to the first flow channel plate and fixed to the bottom plate; the side surfaces of every two adjacent battery cells and the corresponding reinforcing plates jointly surround a flow channel cavity, the flow channel cavity being communicated with the first flow channel; and each of the battery cells is clamped between two adjacent reinforcing plates. The inner side of the first flow channel plate is further provided with a plurality of first flow channel port plates, each of the first flow channel port plates is provided with a first flow channel port, so that the corresponding flow channel cavity is communicated with the first flow channel through the first flow channel port, and each of the battery cells is further clamped between two adjacent first flow channel port plates.

2. The battery pack of claim 1, wherein, One end of the first flow channel plate is provided with an inlet communicated with the first flow channel, and a plurality of first flow channel ports are arranged on the one end of the first flow channel plate in a direction pointing to the other end of the first flow channel port plate, the plurality of first flow channel ports sequentially comprise a plurality of front first flow channel ports, a plurality of middle first flow channel ports and a plurality of rear first flow channel ports; among the plurality of middle first flow channel ports, the box body is provided with a first side plate, the height of the first flow channel port close to the one end of the first side plate is smaller than the height of the first flow channel port close to the other end of the first side plate.

3. The battery pack of claim 2, wherein, Among the plurality of front first flow channel ports, the height of two adjacent first flow channel ports is equal and smaller than the height of the first flow channel port close to the one end of the first flow channel port plate among the plurality of middle first flow channel ports; among the plurality of rear first flow channel ports, the height of two adjacent first flow channel ports is equal and greater than the height of the first flow channel port close to the other end of the first flow channel port plate among the plurality of middle first flow channel ports.

4. The battery pack of claim 3, wherein, The supporting assembly further comprises a second flow channel plate opposite to the first flow channel plate, one end of the second flow channel plate is arranged opposite to the one end of the first flow channel plate, the other end of the second flow channel plate is arranged opposite to the other end of the first flow channel plate, the other end of the second flow channel plate is provided with an outlet, the second flow channel plate is provided with a second flow channel for flowing cooling medium, the inner side of the second flow channel plate is provided with a plurality of second flow channel plates, each of the second flow channel plates is provided with a second flow channel port, and the outlet of the second flow channel plate is communicated with a plurality of flow channel cavities through the second flow channel, a plurality of second flow channel ports of a plurality of second flow channel plates.

5. The battery pack of claim 3, wherein, The width of the first flow channel port is equal to the width of the second flow channel port and the width of the reinforcing plate.

6. The battery pack of claim 5, wherein, The reinforcing plate is integrally formed with the first flow channel port plate and the second flow channel port plate.

7. The battery pack of claim 5, wherein, The battery box comprises the battery box and a plurality of battery cells according to any one of claims 1-7.

8. A battery pack, characterized by, ​ 9. The battery pack of claim 8, wherein, The plurality of the battery cells comprises a plurality of battery cell groups arranged along the length direction of the first flow channel opening plate, and the plurality of the battery cells of each battery cell group are arranged along the length direction of the plurality of the reinforcing plates, 1 / 9≤W1 / L1≤1 / 6; wherein W1 is the width of the first flow channel opening and the second flow channel opening, and L1 is the length of the battery cell group.

10. The battery pack of claim 8, wherein, The plurality of the battery cells comprises a plurality of battery cell groups arranged along the length direction of the box, and the plurality of the battery cells of each battery cell group are arranged along the length direction of the plurality of the reinforcing plates, 1 / 230≤L2 / L1≤1 / 115; wherein L1 is the length of the battery cell group, and L2 is the length of the first flow channel opening plate.

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