Cooling system of battery pack and battery pack

Abstract

The utility model belongs to the technical field of electrochemical energy storage, and particularly discloses a cooling system of a battery pack and the battery pack. According to the cooling system of the battery pack provided by the utility model, the cooling medium enters the cooling circulation flow channel through the cooling medium inlet and then is discharged out of the cooling circulation flow channel through the cooling medium outlet, and the cooling medium absorbs the heat of the side surface of the battery cell along the height direction and the heat of the bottom of the battery cell in the process of flowing in the cooling circulation flow channel; the heat dissipation area of the battery cell is increased, the heat dissipation capability of the cooling system is improved, the cooling effect is improved, the temperature uniformity of the battery cell is improved, and the temperature distribution difference of the battery cell in the height direction is reduced, so that the operation performance of the battery cell is improved; besides, the cooling box body and the cooling partition plate form the cavity for accommodating the battery cells, the battery pack is directly assembled, the cooling box body has the performance of bearing and cooling the battery cells, the utilization rate of the cooling box body is improved, and the assembly process of the battery pack is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemistry energy storage technical field especially, a kind of cooling system and battery pack of battery pack. BACKGROUND

[0002] Compared with power battery system, the battery capacity and charge-discharge power of energy storage system are larger, the gap between battery cells in battery pack is small and arranged closely, and the energy density is high.According to the electrochemistry-thermal characteristics of lithium battery, too low (<15 ℃) or too high (>45 ℃) working temperature will affect the charge-discharge efficiency, cycle life, capacity and safety of lithium battery.Especially during high-rate charge-discharge, the heat generation in battery pack increases significantly, which shows uneven internal heat generation, uneven temperature distribution of battery cell body and battery pack, and more serious consistency problem of battery cell.

[0003] To quickly take away the heat generated by battery pack, ensure that battery cell is in suitable working temperature range, ensure its operation in the best state, improve the performance of energy storage system, use cold plate type indirect liquid cooling to cool battery pack.Cold plate type indirect liquid cooling has the advantages of good cooling performance and good cooling uniformity, so that battery pack has compact structure, small floor area and low construction cost.

[0004] At present, liquid-cooled battery pack is in the form of cell to pack (CTP hereinafter), combined with the liquid cooling mode of bottom aluminum cold plate to form battery pack.Liquid cooling plate is in contact with the bottom of battery cell, and the heat generated by battery cell during operation is conducted to liquid cooling plate, and then taken away by cold fluid flowing in liquid cooling plate, so that the temperature at the bottom of battery cell is low.However, due to the large size of battery cell in the height direction, the thermal conductivity in this direction is low, which leads to serious temperature difference in the height direction. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of cooling system and battery pack of battery pack, increase the heat dissipation area of battery cell, improve the heat dissipation capacity of cooling system, improve the effect of cooling, improve the uniformity of temperature of battery cell, and also simplify the assembly process of battery pack.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, a cooling system of battery pack is provided, which comprises a cooling box body, a plurality of cooling partitions are arranged in the cooling box body and are parallel to each other, and a plurality of cavities are formed, the cavities are used to accommodate battery cells, cooling flow channels are arranged on the side wall of the cooling box body, the bottom wall of the cooling box body and the cooling partitions, and the cooling flow channels are connected to each other to form a cooling circulation flow channel, a cooling medium inlet is arranged at one end of the cooling circulation flow channel, and a cooling medium outlet is arranged at the other end.

[0008] As an optional technical solution of the battery pack cooling system, the two side walls of the cooling box parallel to the cooling partition plate are a first side wall and a second side wall, the first side wall, the cooling partition plate and the second side wall are arranged in an alternating manner to form a first cooling flow channel and a second cooling flow channel, and the cooling flow channel on the bottom wall of the cooling box is a third cooling flow channel.

[0009] One end of the first cooling flow channel is in communication with the cooling medium inlet, the other end of the first cooling flow channel is in communication with the third cooling flow channel, one end of the second cooling flow channel is in communication with the third cooling flow channel, and the other end of the second cooling flow channel is in communication with the cooling medium outlet, and the first cooling flow channel, the second cooling flow channel and the third cooling flow channel form the cooling circulation flow channel.

[0010] As an optional technical solution of the battery pack cooling system, the bottom wall of the cooling box comprises a bottom cooling bottom plate and a bottom cooling upper plate arranged in a superimposed manner, the third cooling flow channel is arranged on the bottom cooling bottom plate, and the bottom cooling upper plate is provided with a plurality of communication flow channels, and the communication flow channels are in communication with the first cooling flow channel and the third cooling flow channel or in communication with the second cooling flow channel and the third cooling flow channel.

[0011] As an optional technical solution of the battery pack cooling system, the first cooling flow channel is parallel to the second cooling flow channel, the first cooling flow channel and the second cooling flow channel are respectively provided with the communication flow channels, each communication flow channel is in communication with the third cooling flow channel, and the projections on the horizontal plane are perpendicular to each other, and the first cooling flow channel and the second cooling flow channel are perpendicular to the horizontal plane and in communication with the corresponding communication flow channels.

[0012] And / or, the third cooling flow channel is provided with a plurality of third cooling flow channels, and the plurality of third cooling flow channels are arranged in a length direction of the communication flow channel, and each communication flow channel is in communication with the plurality of third cooling flow channels.

[0013] As an optional technical solution of the battery pack cooling system, one side wall of the cooling box perpendicular to the cooling partition plate is a third side wall, a connecting plate is arranged in the cooling box, the connecting plate is arranged close to the third side wall and parallel to the third side wall, a cooling medium shunt passage is arranged on the connecting plate, and the cooling medium shunt passage is in communication with the first cooling flow channel and the cooling medium inlet.

[0014] As an optional technical solution of the battery pack cooling system, the other side wall of the cooling box body perpendicular to the cooling partition plate is a fourth side wall, the fourth side wall is provided with a cooling medium confluence passage, and the cooling medium confluence passage is communicated with the second cooling flow channel and the cooling medium outlet.

[0015] As an optional technical solution of the battery pack cooling system, the cooling partition plate extends along the width direction of the battery cell placed in the cavity.

[0016] Or, the cooling partition plate extends along the length direction of the battery cell placed in the cavity.

[0017] As an optional technical solution of the battery pack cooling system, the lid plate is further provided with a first extension plate extending from the circumferential edge of the lid plate, a second extension plate extending from the opening circumferential edge of the cooling box body, the lid plate is buckled on the cooling box body, and the first extension plate is attached to the second extension plate.

[0018] As an optional technical solution of the battery pack cooling system, the cooling partition plate and the cooling box body are integrally formed.

[0019] In the second aspect, a battery pack is provided, which comprises a battery cell and the battery pack cooling system.

[0020] The battery pack cooling system has the following beneficial effects:

[0021] The battery pack cooling system provided by the utility model has the following beneficial effects: the cooling flow channels are arranged on the side wall, the bottom wall of the cooling box body and the cooling partition plate, and the cooling flow channels are communicated with each other to form a cooling circulation flow channel; the cooling medium enters the cooling circulation flow channel through the cooling medium inlet and is discharged from the cooling circulation flow channel through the cooling medium outlet; the cooling medium absorbs the heat of the side surface of the battery cell along the height direction and the heat of the bottom of the battery cell during the flowing process in the cooling circulation flow channel; the heat dissipation area of the battery cell is increased; the heat dissipation capacity of the cooling system is improved; the cooling effect is improved; the temperature uniformity of the battery cell is improved; the temperature distribution difference of the battery cell in the height direction is reduced; and the operation performance of the battery cell is improved; in addition, the cooling box body and the cooling partition plate constitute a cavity for accommodating the battery cell and are directly assembled into the battery pack; the cooling box body has the performance of bearing and cooling the battery cell; the utilization rate of the cooling box body is improved; and the assembly process of the battery pack is simplified. ACCURACY

[0022] Figure 1 is a decomposition structure schematic view of the battery pack provided by the utility model embodiment;

[0023] Figure 2is a structural schematic view of the first cooling flow channel and the second cooling flow channel provided by the embodiment of the utility model;

[0024] Figure 3 is a structural schematic view of the electric core installed in the cooling box provided by the embodiment of the utility model;

[0025] Figure 4 is a schematic view of the cooling medium flow in the first cooling flow channel, the second cooling flow channel and the third cooling flow channel provided by the embodiment of the utility model;

[0026] Figure 5 is a structural schematic view of the third cooling flow channel and the communication flow channel provided by the embodiment of the utility model.

[0027] In the drawing,

[0028] 100, electric core; 200, conductive row; 300, heat insulation piece;

[0029] 1, cooling box; 2, cooling partition; 3, cooling medium inlet; 4, cooling medium outlet; 5, first cooling flow channel; 6, second cooling flow channel; 7, third cooling flow channel; 8, connecting plate; 9, cover plate;

[0030] 11, first side wall; 12, second side wall; 13, third side wall; 14, fourth side wall; 15, bottom cooling bottom plate; 16, bottom cooling upper plate; 17, communication flow channel; 18, second extension plate; 19, cooling medium confluence passage;

[0031] 81, cooling medium shunt passage;

[0032] 91, first extension plate. DETAILED DESCRIPTION

[0033] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, and not limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.

[0034] In the description of the utility model, unless there is explicit definition and limitation, the terms "connect", "connect", "fix" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that first feature is higher than second feature in horizontal height.First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that first feature is lower than second feature in horizontal height.

[0036] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" are terms that refer to the orientation of the device as shown in the drawings and are used only to facilitate the description and are not intended to limit or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] As shown in Figure 1 and Figure 2 The utility model provides a kind of battery pack, which can be battery pack in the form of cell-module.The battery pack includes a cell 100 and a cooling system of the battery pack, which is configured to dissipate heat from the cell 100.

[0038] The cooling system of the battery pack includes a cooling box 1, which is provided with a plurality of cooling partitions 2 arranged in parallel and spaced apart. The cooling partitions 2 form a plurality of cavities for accommodating the cell 100. Cooling flow channels are provided on the side walls of the cooling box 1, the bottom wall of the cooling box 1, and the cooling partitions 2. The cooling flow channels are in communication with each other and form a cooling circulation flow channel. One end of the cooling circulation flow channel is provided with a cooling medium inlet 3, and the other end is provided with a cooling medium outlet 4.

[0039] The cooling system of the battery pack provided by the embodiment is provided with cooling flow channels on the side wall, the bottom wall and the cooling partition plate 2 of the cooling box 1, and the cooling flow channels are communicated with each other to form a cooling circulation flow channel. The cooling medium enters the cooling circulation flow channel through the cooling medium inlet 3 and is discharged from the cooling circulation flow channel through the cooling medium outlet 4. The cooling medium absorbs the heat of the side surface of the battery cell 100 in the height direction and the heat of the bottom of the battery cell 100 in the process of flowing in the cooling circulation flow channel. The cooling system increases the heat dissipation area of the battery cell 100, improves the heat dissipation capacity of the cooling system, improves the cooling effect, improves the uniformity of the temperature of the battery cell 100, reduces the temperature distribution difference of the battery cell 100 in the height direction, and thus improves the operation performance of the battery cell 100. In addition, the cooling box 1 and the cooling partition plate 2 constitute a cavity for accommodating the battery cell 100 and are directly assembled into a battery pack. The cooling box 1 has the functions of bearing and cooling the battery cell 100, improves the utilization rate of the cooling box 1, and simplifies the assembly process of the battery pack.

[0040] As shown in Figure 3 , a plurality of battery cells 100 are arranged in each cavity of the cooling box 1. The plurality of battery cells 100 in each cavity form a battery cell assembly. The two adjacent battery cells 100 in each battery cell assembly are connected in series through the conductive bar 200, and the two adjacent battery cell assemblies are connected in series through the conductive bar 200. The two adjacent battery cells 100 are provided with a heat insulation member 300 to reduce the risk of thermal runaway. Optionally, the heat insulation member 300 can be an aerogel heat insulation pad.

[0041] As shown in Figure 1 , the cooling partition plate 2 and the cooling box 1 are integrally formed, which is convenient for processing and does not need to be assembled subsequently.

[0042] In some embodiments, the cooling partition plate 2 extends along the width direction of the battery cell 100 placed in the cavity. The cooling partition plate 2 cools the side surface enclosed by the width direction and the height direction of the battery cell 100, has good heat dissipation effect, and improves the compactness of the structure of the battery pack.

[0043] In other embodiments, the cooling partition plate 2 extends along the length direction of the battery cell 100 placed in the cavity. The cooling partition plate 2 cools the side surface enclosed by the length direction and the height direction of the battery cell 100, increases the heat dissipation area of the battery cell 100, and has good heat dissipation effect.

[0044] The two side walls of the cooling box body 1 parallel to the cooling partition plate 2 are a first side wall 11 and a second side wall 12, respectively, and the other two side walls of the cooling box body 1 are a third side wall 13 and a fourth side wall 14, respectively. The first side wall 11, the second side wall 12, the third side wall 13 and the fourth side wall 14 form a frame structure, and the bottom wall of the cooling box body 1 closes one end opening of the frame structure, thereby forming a cooling box body 1 with one end opening. A cover plate 9 is provided on the cooling box body 1 to close the opening of the cooling box body 1. The circumferential edge of the cover plate 9 extends a first extension plate 91, and the circumferential edge of the opening of the cooling box body 1 extends a second extension plate 18. The cover plate 9 is buckled on the cooling box body 1, and the first extension plate 91 and the second extension plate 18 are attached to form a seal, thereby improving the sealing performance of the battery pack. Further, a sealing member can be provided between the first extension plate 91 and the second extension plate 18 to further improve the sealing performance of the battery pack. Optionally, the sealing member can be a sealing ring, which is arranged along the circumference of the first extension plate 91. The sealing ring is made of rubber and has elastic deformation performance, which can play a sealing role. One of the first extension plate 91 and the second extension plate 18 is provided with a sealing groove, one end of the sealing ring is arranged in the sealing groove, and the other end of the sealing ring protrudes out of the sealing groove and abuts against the other one of the first extension plate 91 and the second extension plate 18.

[0045] In combination with Figure 1 , Figure 2 and Figure 4 , in some embodiments, the first side wall 11, the cooling partition plate 2 and the second side wall 12 are arranged with the first cooling flow channel 5 and the second cooling flow channel 6 in an alternating manner, and the cooling flow channel on the bottom wall of the cooling box body 1 is the third cooling flow channel 7. One end of the first cooling flow channel 5 is in communication with the cooling medium inlet 3, respectively, the other end of the first cooling flow channel 5 is in communication with the third cooling flow channel 7, respectively, one end of the second cooling flow channel 6 is in communication with the third cooling flow channel 7, respectively, the other end of the second cooling flow channel 6 is in communication with the cooling medium outlet 4, respectively, and the first cooling flow channel 5, the second cooling flow channel 6 and the third cooling flow channel 7 form a cooling circulation flow channel. The cooling medium entering through the cooling medium inlet 3 flows through the first cooling flow channel 5, the third cooling flow channel 7 and the second cooling flow channel 6 in sequence, and then is discharged through the cooling medium outlet 4. In the process of cooling medium circulation, the opposite two side surfaces and the bottom surface of the battery cell 100 are cooled by heat absorption. Compared with the prior art structure in which the side cooling and bottom cooling of the battery cell 100 are separated, the side cooling structure and the bottom cooling structure of the battery cell 100 are integrated, the cooling system of the battery pack and the shell of the battery pack are designed in one piece, and the space occupancy of the battery pack is reduced. In addition, the cooling box body 1 and the battery cell 100 are assembled directly into a battery pack, which reduces the resistance of the cooling medium flow, reduces the energy consumption of the system operation, improves the operation condition of the liquid cooling system, and improves the cooling efficiency and the temperature control ability of the cooling system.

[0046] For example, the cooling box 1 is provided with three cooling baffles 2. The cooling baffle 2 in the middle is provided with a second cooling channel 6, and the other two cooling baffles 2 are provided with a first cooling channel 5. The first side wall 11 and the second side wall 12 are provided with a second cooling channel 6. The first cooling channel 5 and the second cooling channel 6 are arranged alternately.

[0047] in Figure 2 and Figure 4 The "a" in the text refers to the direction of the cooling medium flow within the first cooling channel 5. Figure 2 and Figure 4 The 'b' in the text refers to the direction of the cooling medium flow within the second cooling channel 6. Figure 4 In this context, 'c' represents the direction of the cooling medium flow within the connecting channel 17.

[0048] like Figure 1 , Figure 2 and Figure 5 As shown, the bottom wall of the cooling box 1 includes a bottom cooling base plate 15 and a bottom cooling top plate 16 stacked together, with the bottom cooling top plate 16 positioned above the bottom cooling base plate 15. A third cooling channel 7 is provided on the bottom cooling base plate 15, and multiple connecting channels 17 are provided on the bottom cooling top plate 16. These connecting channels 17 connect the first cooling channel 5 and the third cooling channel 7, or connect the second cooling channel 6 and the third cooling channel 7. The bottom cooling top plate 16, with its connecting channels 17, facilitates the connection between the first cooling channel 5 and the third cooling channel 7, or the second cooling channel 6 and the third cooling channel 7. Optionally, the bottom cooling base plate 15 and the bottom cooling top plate 16 are connected to the frame structure of the cooling box 1 by welding.

[0049] The bottom cooling plate 16 has at least one side facing the cavity made of an overheating interface material with high thermal conductivity and good heat dissipation efficiency.

[0050] Optionally, the first cooling channel 5 is parallel to the second cooling channel 6, and the first cooling channel 5 and the second cooling channel 6 are respectively provided with connecting channels 17, the length direction of the connecting channels 17 being consistent with the length direction of the first cooling channel 5 or the second cooling channel 6. Each connecting channel 17 is connected to the third cooling channel 7, and the projection of the connecting channel 17 on the horizontal plane is perpendicular to the projection of the third cooling channel 7 on the horizontal plane. The first cooling channel 5 and the second cooling channel 6 are perpendicular to the horizontal plane and are respectively connected to the corresponding connecting channels 17. The cooling medium entering the first cooling channel 5 flows from top to bottom to the connecting channel 17, and the cooling medium in the connecting channel 17 flows to the third cooling channels 7 located on both sides of the connecting channel 17, and then flows from bottom to top in the third cooling channels 7 and converges to the cooling medium outlet 4 for discharge. This structure reduces the flow resistance of the cooling medium, increases the cooling medium circulation speed, and reduces the energy loss of the system.

[0051] Optionally, a plurality of third cooling flow channels 7 are provided, and the plurality of third cooling flow channels 7 are arranged along the length direction of the communication flow channel 17, and each communication flow channel 17 is in communication with the plurality of third cooling flow channels 7. The plurality of third cooling flow channels 7 ensure that the bottom of each battery cell 100 can be effectively cooled, and each communication flow channel 17 is in communication with the plurality of third cooling flow channels 7, so that the cooling medium in the communication flow channel 17 can flow to the third cooling flow channels 7 on both sides at the same time, ensuring the consistency and simultaneity of the cooling of the bottom of the battery cell 100, and improving the cooling efficiency.

[0052] A plurality of first cooling flow channels 5 or a plurality of second cooling flow channels 6 are arranged on the cooling partition plate 2, the first side wall 11 and the second side wall 12, respectively, the plurality of first cooling flow channels 5 and the plurality of second cooling flow channels 6 extend along the height direction, and the plurality of first cooling flow channels 5 and the plurality of second cooling flow channels 6 are perpendicular to the corresponding communication flow channel 17, one end of the plurality of first cooling flow channels 5 or one end of the plurality of second cooling flow channels 6 is in communication with the corresponding communication flow channel 17, the other end of the plurality of first cooling flow channels 5 is in communication with the cooling medium inlet 3, and the other end of the plurality of second cooling flow channels 6 is in communication with the cooling medium outlet 4.

[0053] In some embodiments, a connecting plate 8 is arranged in the cooling box 1, the connecting plate 8 is arranged close to the third side wall 13 of the cooling box 1 and parallel to the third side wall 13, the connecting plate 8 is provided with a cooling medium distribution channel 81, and the cooling medium distribution channel 81 is in communication with the first cooling flow channel 5 and the cooling medium inlet 3. The cooling medium entering the cooling medium distribution channel 81 is distributed to different first cooling flow channels 5, so that the cooling of the battery cell 100 is simultaneous and consistent.

[0054] Optionally, the connecting plate 8 can be connected with the cooling partition plate 2 or the first side wall 11 or the second side wall 12 provided with the first cooling flow channel 5 to form a cavity enclosed on four sides, thereby providing stable support for the installation of the battery cell 100 and facilitating the connection of the first cooling flow channel 5 and the cooling medium distribution channel 81.

[0055] In other embodiments, the cooling medium distribution channel 81 is arranged on the third side wall 13 of the cooling box 1, and the cooling medium distribution channel 81 is in communication with the first cooling flow channel 5 and the cooling medium inlet 3.

[0056] In some embodiments, the cooling box 1 is provided with a cooling medium confluence channel 19 on the fourth side wall 14, the cooling medium confluence channel 19 is in communication with the second cooling flow channel 6 and the cooling medium outlet 4, and the cooling medium in the second cooling flow channel 6 enters the cooling medium confluence channel 19 for confluence and is discharged through the cooling medium outlet 4.

[0057] The inner side of the cooling box 1, the two sides of the cooling partition 2 and the surface of the connecting plate 8 facing the cavity are all superheated interface materials, which have high thermal conductivity and good heat dissipation efficiency.

[0058] The cross sections of the first cooling flow channel 5, the second cooling flow channel 6, the third cooling flow channel 7, the communication flow channel 17, the cooling medium branch passage 81 and the cooling medium confluence passage 19 can be circular, square or other shapes, which are not limited here.

[0059] The cooling medium is preferably liquid, and can also be gas, which is not limited here.

[0060] Based on the design of the cooling system, it is pointed out by the numerical simulation test that the cooling system has good temperature control performance and low flow resistance. Exemplarily, when the heat production rate of the single battery cell 100 is 16W, the flow rate of the cooling medium inlet 3 is 6L / min, and the temperature of the cooling medium at the cooling medium inlet 3 is less than 20℃, the test results are shown in Table 1 below, wherein the bottom cooling in the table is only the case of cooling the battery cell 100 from the bottom, and the multi-surface cooling is the case of cooling the battery cell 100 by the cooling system.

[0061] Table 1

[0062]

[0063] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. Cooling system of a battery pack, characterized in that, The application relates to a cooling box body (1) which is internally provided with a plurality of cooling partitions (2) arranged in parallel at intervals and forms a plurality of cavities for accommodating battery cells (100), cooling flow channels are arranged on the side walls of the cooling box body (1), the bottom wall of the cooling box body (1) and the cooling partitions (2), and the cooling flow channels are interconnected to form a cooling circulation flow channel, one end of the cooling circulation flow channel is provided with a cooling medium inlet (3), and the other end is provided with a cooling medium outlet (4).

2. The cooling system of a battery pack according to claim 1, wherein, The two side walls of the cooling box body (1) which are parallel to the cooling partitions (2) are a first side wall (11) and a second side wall (12), the first side wall (11), the cooling partitions (2) and the second side wall (12) are provided with first cooling flow channels (5) and second cooling flow channels (6) in an alternating mode, and the cooling flow channels on the bottom wall of the cooling box body (1) are third cooling flow channels (7). One end of the first cooling flow channel (5) is communicated with the cooling medium inlet (3), the other end of the first cooling flow channel (5) is communicated with the third cooling flow channel (7), one end of the second cooling flow channel (6) is communicated with the third cooling flow channel (7), the other end of the second cooling flow channel (6) is communicated with the cooling medium outlet (4), and the first cooling flow channel (5), the second cooling flow channel (6) and the third cooling flow channel (7) form the cooling circulation flow channel.

3. The cooling system of a battery pack according to claim 2, wherein, The bottom wall of the cooling box body (1) comprises a bottom cooling bottom plate (15) and a bottom cooling upper plate (16) which are arranged in a superimposed mode, the third cooling flow channels (7) are arranged on the bottom cooling bottom plate (15), and a plurality of communication flow channels (17) are arranged on the bottom cooling upper plate (16) and communicate the first cooling flow channels (5) and the third cooling flow channels (7) or the second cooling flow channels (6) and the third cooling flow channels (7).

4. The cooling system of a battery pack according to claim 3, wherein, The first cooling flow channel (5) and the second cooling flow channel (6) are parallel, the first cooling flow channel (5) and the second cooling flow channel (6) are respectively provided with the communication flow channels (17), each communication flow channel (17) is communicated with the third cooling flow channel (7), and the projections on a horizontal plane are perpendicular to each other, the first cooling flow channel (5) and the second cooling flow channel (6) are perpendicular to the horizontal plane and are respectively communicated with the corresponding communication flow channels (17). And / or, the third cooling flow channels (7) are provided in plurality, the plurality of third cooling flow channels (7) are arranged at intervals along the length direction of the communication flow channels (17), and each communication flow channel (17) is communicated with the plurality of third cooling flow channels (7).

5. The cooling system of a battery pack according to claim 2, wherein, The side wall of the cooling box (1) perpendicular to the cooling partition plate (2) is a third side wall (13), the cooling box (1) is provided with a connecting plate (8), the connecting plate (8) is arranged close to the third side wall (13) and parallel to the third side wall (13), the connecting plate (8) is provided with a cooling medium shunt passage (81), and the cooling medium shunt passage (81) is communicated with the first cooling flow channel (5) and the cooling medium inlet (3).

6. The cooling system of a battery pack according to claim 2, wherein, The other side wall of the cooling box (1) perpendicular to the cooling partition plate (2) is a fourth side wall (14), the fourth side wall (14) is provided with a cooling medium shunt passage (19), and the cooling medium shunt passage (19) is communicated with the second cooling flow channel (6) and the cooling medium outlet (4).

7. The cooling system of a battery pack according to any one of claims 1-6, characterized in that, The cooling partition plate (2) extends along the width direction of the battery cell (100) placed in the cavity. Or, the cooling partition plate (2) extends along the length direction of the battery cell (100) placed in the cavity.

8. The cooling system of a battery pack according to any one of claims 1-6, characterized in that, Further comprising a cover plate (9), the circumferential edge of the cover plate (9) extends a first extension plate (91), the opening circumferential edge of the cooling box (1) extends a second extension plate (18), the cover plate (9) is buckled on the cooling box (1), and the first extension plate (91) is attached to the second extension plate (18).

9. The cooling system of a battery pack according to any one of claims 1-6, characterized in that, The cooling partition plate (2) and the cooling box (1) are an integral molding structure.

10. A battery pack characterized by, The battery pack cooling system comprises a battery cell (100) and the battery pack cooling system of any one of claims 1-9.

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