Cooling system of battery pack and battery pack

Abstract

The invention 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 invention, 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 heat of the side surfaces of the battery cells in the height direction and heat of the bottoms of the battery cells 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 present invention relates to the technical field of electrochemical energy storage, and in particular to a cooling system for a battery pack and a battery pack. Background Art

[0002] Compared with the power battery system, the battery capacity and charge and discharge power of the energy storage system are larger, the gap between the cells in the battery pack is small and the arrangement is close, and the energy density is high. According to the electrochemical-thermal characteristics of lithium batteries, too low (<15°C) or too high (>45°C) operating temperature will affect the charge and discharge efficiency, cycle life, capacity and safety of lithium batteries. Especially during high-rate charge and discharge, the heat generation in the battery pack increases significantly, which is manifested as uneven internal heat generation, uneven temperature distribution of the cell body and the battery pack, and more serious cell consistency problems.

[0003] In order to quickly remove the heat generated by the battery pack, ensure that the battery cell is within the appropriate operating temperature range, ensure that it operates in the best state, and improve the performance of the energy storage system, the battery pack is cooled by cold plate indirect liquid cooling. Cold plate indirect liquid cooling has the advantages of good cooling performance and good cooling uniformity, making the battery pack compact, small in footprint, and low in construction cost.

[0004] At present, the liquid-cooled battery pack is in the form of a cell-module integration (Cell to Pack, hereinafter referred to as CTP), which is combined with the liquid cooling method of the bottom aluminum cooling plate to form a battery pack. The liquid cooling plate is in contact with the bottom of the battery cell. The heat generated by the battery cell when working is transferred to the liquid cooling plate, and then carried away by the cold fluid flowing in the liquid cooling plate through heat exchange, so that the temperature at the bottom of the battery cell is relatively low. However, due to the large size of the battery cell in the height direction, the thermal conductivity in this direction is relatively low, resulting in serious differences in temperature distribution in the height direction. Summary of the invention

[0005] The object of the present invention is to provide a cooling system for a battery pack and a battery pack, which increases the heat dissipation area of ​​the battery cell, improves the heat dissipation capacity of the cooling system, improves the cooling effect, improves the temperature uniformity of the battery cell, and simplifies the assembly process of the battery pack.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, a cooling system for a battery pack is provided, comprising a cooling box, wherein a plurality of cooling baffles spaced apart and arranged in parallel are provided in the cooling box to form a plurality of cavities, wherein the cavities are used to accommodate battery cells, cooling channels are provided on the side walls of the cooling box, on the bottom wall of the cooling box and on the cooling baffles, and the cooling channels are interconnected to form a cooling circulation channel, wherein a cooling medium inlet is provided at one end of the cooling circulation channel, and a cooling medium outlet is provided at the other end.

[0008] As an optional technical solution of the cooling system of the above-mentioned battery pack, the two side walls of the cooling box body parallel to the cooling baffle are respectively the first side wall and the second side wall, the first side wall, the cooling baffle and the second side wall are provided with the first cooling channel and the second cooling channel in an alternating manner, and the cooling channel on the bottom wall of the cooling box body is the third cooling channel;

[0009] One end of the first cooling channel is respectively connected to the cooling medium inlet, the other end of the first cooling channel is respectively connected to the third cooling channel, one end of the second cooling channel is respectively connected to the third cooling channel, and the other end of the second cooling channel is respectively connected to the cooling medium outlet, and the first cooling channel, the second cooling channel and the third cooling channel form the cooling circulation channel.

[0010] As an optional technical solution for the cooling system of the above-mentioned battery pack, the bottom wall of the cooling box includes a bottom cooling bottom plate and a bottom cooling upper plate that are overlapped, the third cooling channel is arranged on the bottom cooling bottom plate, and a plurality of connecting channels are arranged on the bottom cooling upper plate, the connecting channel connects the first cooling channel and the third cooling channel, or connects the second cooling channel and the third cooling channel.

[0011] As an optional technical solution of the cooling system of the above-mentioned battery pack, the first cooling channel is parallel to the second cooling channel, the first cooling channel and the second cooling channel are respectively provided with the connecting channel, each of the connecting channels is respectively connected to the third cooling channel, and the projections on the horizontal plane are perpendicular to each other, the first cooling channel and the second cooling channel are perpendicular to the horizontal plane and are respectively connected to the corresponding connecting channels;

[0012] And / or, a plurality of the third cooling channels are provided, and the plurality of the third cooling channels are arranged at intervals along the length direction of the connecting channel, and each of the connecting channel is respectively connected to the plurality of the third cooling channels.

[0013] As an optional technical solution for the cooling system of the above-mentioned battery pack, a side wall of the cooling box body that is perpendicular to the cooling partition is a third side wall, and a connecting plate is provided in the cooling box body. The connecting plate is arranged close to the third side wall and parallel to the third side wall, and a cooling medium diversion channel is provided on the connecting plate, and the cooling medium diversion channel connects the first cooling channel and the cooling medium inlet.

[0014] As an optional technical solution for the cooling system of the above-mentioned battery pack, the other side wall of the cooling box body perpendicular to the cooling partition is a fourth side wall, and a cooling medium confluence channel is provided on the fourth side wall, and the cooling medium confluence channel connects the second cooling flow channel and the cooling medium outlet.

[0015] As an optional technical solution of the cooling system of the above-mentioned battery pack, the cooling baffle extends along the width direction of the battery cell placed in the cavity;

[0016] Alternatively, the cooling baffle extends along the length direction of the battery core placed in the cavity.

[0017] As an optional technical solution for the cooling system of the above-mentioned battery pack, it also includes a cover plate, a first extension plate extends from the circumferential edge of the cover plate, a second extension plate extends from the open circumferential edge of the cooling box body, the cover plate is buckled on the cooling box body, and the first extension plate is in contact with the second extension plate.

[0018] As an optional technical solution for the cooling system of the above-mentioned battery pack, the cooling baffle and the cooling box are an integrally formed structure.

[0019] In a second aspect, a battery pack is provided, comprising a battery cell and a cooling system for the battery pack as described in any one of the above.

[0020] Beneficial effects of the present invention:

[0021] The cooling system of the battery pack provided by the present invention is provided with cooling channels on the side walls, bottom wall and cooling baffle of the cooling box, and the cooling channels are interconnected to form a cooling circulation channel. The cooling medium enters the cooling circulation channel through the cooling medium inlet and is discharged from the cooling circulation channel through the cooling medium outlet. The cooling medium absorbs the heat from the sides of the battery cells along the height direction and the heat from the bottom of the battery cells during the flow in the cooling circulation channel, thereby increasing the heat dissipation area of ​​the battery cells, improving the heat dissipation capacity of the cooling system, improving the cooling effect, improving the temperature uniformity of the battery cells, and reducing the temperature distribution difference of the battery cells in the height direction, thereby improving the operating performance of the battery cells. In addition, the cooling box and the cooling baffle form a cavity for accommodating the battery cells, which are directly assembled into a battery pack. The cooling box takes into account the performance of both load-bearing and cooling the battery cells, thereby improving the utilization rate of the cooling box and simplifying the assembly process of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the exploded structure of a battery pack provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a first cooling channel and a second cooling channel provided in an embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a battery cell provided by an embodiment of the present invention installed in a cooling box;

[0025] Figure 4 is a schematic diagram of the flow of cooling medium in the first cooling channel, the second cooling channel and the third cooling channel provided by an embodiment of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the third cooling channel and the connecting channel provided in an embodiment of the present invention.

[0027] In the figure:

[0028] 100, battery cell; 200, conductive bar; 300, thermal insulation;

[0029] 1. Cooling box; 2. Cooling baffle; 3. Cooling medium inlet; 4. Cooling medium outlet; 5. First cooling channel; 6. Second cooling channel; 7. Third cooling 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. connecting flow channel; 18. second extension plate; 19. cooling medium converging channel;

[0031] 81. Cooling medium diversion channel;

[0032] 91. First extension plate. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides a battery pack, which may be a battery pack in the form of a battery cell-module. The battery pack includes a battery cell 100 and a cooling system of the battery pack, and the cooling system of the battery pack is used to dissipate heat for the battery cell 100.

[0038] The cooling system of the battery pack includes a cooling box 1, in which a plurality of cooling baffles 2 are arranged in parallel and spaced apart from each other, and a plurality of cavities are formed, and the cavities are used to accommodate the battery cells 100. Cooling channels are arranged on the side walls of the cooling box 1, on the bottom wall of the cooling box 1, and on the cooling baffles 2, and the cooling channels are interconnected to form a cooling circulation channel, and a cooling medium inlet 3 is arranged at one end of the cooling circulation channel, and a cooling medium outlet 4 is arranged at the other end.

[0039] The cooling system of the battery pack provided in the present embodiment is provided with cooling channels on the side walls, bottom walls and cooling baffles 2 of the cooling box 1, and the cooling channels are interconnected to form a cooling circulation channel. The cooling medium enters the cooling circulation channel through the cooling medium inlet 3 and is discharged from the cooling circulation channel through the cooling medium outlet 4. The cooling medium absorbs the heat of the side of the battery cell 100 along the height direction and the heat of the bottom of the battery cell 100 during the flow in the cooling circulation channel, thereby increasing the heat dissipation area of ​​the battery cell 100, improving the heat dissipation capacity of the cooling system, improving the cooling effect, improving the temperature uniformity of the battery cell 100, and reducing the temperature distribution difference of the battery cell 100 in the height direction, thereby improving the operating performance of the battery cell 100; in addition, the cooling box 1 and the cooling baffles 2 form a cavity for accommodating the battery cell 100, which is directly assembled into a battery pack. The cooling box 1 takes into account the performance 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] like Figure 3 As shown, a plurality of battery cells 100 are respectively arranged in each cavity of the cooling box 1, and the plurality of battery cells 100 in each cavity form a battery cell assembly. Two adjacent battery cells 100 in each battery cell assembly are connected in series through a conductive bar 200, and two adjacent battery cell assemblies are connected in series through a conductive bar 200. A heat insulating member 300 is arranged between two adjacent battery cells 100 to reduce the risk of thermal runaway. Optionally, the heat insulating member 300 may be an aerogel heat insulating pad.

[0041] Continue to see Figure 1 As shown, the cooling baffle 2 and the cooling box body 1 are an integrally formed structure, which is convenient for processing and does not require subsequent assembly.

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

[0043] In other embodiments, the cooling baffle 2 extends along the length direction of the battery cell 100 placed in the cavity, and the cooling baffle 2 cools the side surfaces surrounded by the length direction and the height direction of the battery cell 100, thereby increasing the heat dissipation area of ​​the battery cell 100 and achieving good heat dissipation effect.

[0044] The two side walls of the cooling box 1 parallel to the cooling baffle 2 are respectively the first side wall 11 and the second side wall 12, and the other two side walls of the cooling box 1 are respectively the third side wall 13 and the fourth side wall 14. The first side wall 11, the second side wall 12, the third side wall 13 and the fourth side wall 14 are arranged to form a frame structure, and the bottom wall of the cooling box 1 closes the opening at one end of the frame structure, thereby forming a cooling box 1 with an opening at one end. The cooling box 1 is covered with a cover plate 9 to close the opening of the cooling box 1. The circumferential edge of the cover plate 9 extends with a first extension plate 91, and the circumferential edge of the opening of the cooling box 1 extends with a second extension plate 18. The cover plate 9 is buckled on the cooling box 1, and the first extension plate 91 is fitted with the second extension plate 18 to form a seal, thereby improving the sealing performance of the battery pack. Further optionally, 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 properties, so it can play a sealing role. A sealing groove is provided on one of the first extension plate 91 and the second extension plate 18, one end of the sealing ring is provided in the sealing groove, and the other end of the sealing ring protrudes out of the sealing groove and abuts against the other of the first extension plate 91 and the second extension plate 18.

[0045] Combination Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the first side wall 11, the cooling baffle 2, and the second side wall 12 are provided with the first cooling channel 5 and the second cooling channel 6 in an alternating manner, and the cooling channel on the bottom wall of the cooling box 1 is the third cooling channel 7. One end of the first cooling channel 5 is respectively connected to the cooling medium inlet 3, the other end of the first cooling channel 5 is respectively connected to the third cooling channel 7, one end of the second cooling channel 6 is respectively connected to the third cooling channel 7, and the other end of the second cooling channel 6 is respectively connected to the cooling medium outlet 4, and the first cooling channel 5, the second cooling channel 6, and the third cooling channel 7 form a cooling circulation channel. The cooling medium entering through the cooling medium inlet 3 flows through the first cooling channel 5, the third cooling channel 7 and the second cooling channel 6 in sequence, and then is discharged through the cooling medium outlet 4. In the process of cooling medium circulation, heat is absorbed from the two opposite sides and the bottom of the battery cell 100. Compared with the structure of the prior art in which the side cooling and the 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, and the cooling system of the battery pack and the outer shell of the battery pack are integrated, which reduces the space occupancy rate of the battery pack. In addition, the cooling box 1 and the battery cell 100 are directly integrated into a battery pack, which reduces the resistance of the cooling medium flow, reduces the energy consumption of the system operation, improves the operating conditions of the liquid cooling system, and improves the cooling efficiency and the temperature control ability of the cooling system.

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

[0047] in Figure 2 and Figure 4 a in the figure refers to the direction of the cooling medium flowing in the first cooling channel 5. Figure 2 and Figure 4 b in the figure refers to the direction of the cooling medium flowing in the second cooling channel 6. Figure 4 Here, c is the direction in which the cooling medium flows in the communicating flow 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 bottom plate 15 and a bottom cooling upper plate 16 which are stacked, and the bottom cooling upper plate 16 is placed above the bottom cooling bottom plate 15. The third cooling channel 7 is arranged on the bottom cooling bottom plate 15, and a plurality of connecting channels 17 are arranged on the bottom cooling upper plate 16, and the 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 upper plate 16 is arranged, and the connecting channels 17 are arranged on the bottom cooling upper plate 16, so as to conveniently connect 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 bottom plate 15 and the bottom cooling upper plate 16 are connected to the frame structure of the cooling box 1 by welding.

[0049] At least one side of the bottom cooling upper plate 16 facing the cavity is made of superheated interface material, which has high thermal conductivity and good heat dissipation efficiency.

[0050] Further 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 a connecting channel 17, and the length direction of the connecting channel 17 is consistent with the length direction of the first cooling channel 5 or the second cooling channel 6. Each connecting channel 17 is respectively 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 channel 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 channel 7 placed on both sides of the connecting channel 17, and then flows from bottom to top through the third cooling channel 7 and converges to the cooling medium outlet 4 for discharge. This structural setting reduces the flow resistance of the cooling medium, the cooling medium circulates quickly, and reduces the energy loss of the system.

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

[0052] A plurality of first cooling channels 5 are respectively arranged on the cooling baffle 2, the first side wall 11 and the second side wall 12, or a plurality of second cooling channels 6 are respectively arranged on the cooling baffle 2, the first side wall 11 and the second side wall 12, the plurality of first cooling channels 5 and the plurality of second cooling channels 6 extend in the height direction, and the plurality of first cooling channels 5 and the plurality of second cooling channels 6 are respectively perpendicular to the corresponding connecting channels 17, one end of the plurality of first cooling channels 5 or one end of the plurality of second cooling channels 6 are respectively connected to the corresponding connecting channels 17, the other ends of the plurality of first cooling channels 5 are connected to each other and to the cooling medium inlet 3, and the other ends of the plurality of second cooling channels 6 are connected to each other and to the cooling medium outlet 4.

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

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

[0055] In some other embodiments, a cooling medium shunt channel 81 is provided on the third side wall 13 of the cooling box body 1 , and the cooling medium shunt channel 81 is connected to the first cooling channel 5 and the cooling medium inlet 3 .

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

[0057] The inner side surface of the cooling box body 1, the two side surfaces of the cooling baffle 2 and the surface of the connecting plate 8 facing the cavity are all made of superheated interface materials with high thermal conductivity and good heat dissipation efficiency.

[0058] The cross-sections of the first cooling channel 5, the second cooling channel 6, the third cooling channel 7, the connecting channel 17, the cooling medium diversion channel 81 and the cooling medium converging channel 19 can be circular, square or other shapes, which are not specifically limited here.

[0059] The cooling medium is preferably liquid, but may also be gas, which is not specifically limited here.

[0060] Based on the design of the above cooling system, numerical simulation technology tests indicate that the cooling system of the present application has good temperature control performance and low flow resistance. For example, when the heat generation rate of the single 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°C, the test results are shown in Table 1 below, where the bottom cooling in the table refers to the case where only the bottom of the cell 100 can be cooled, and the multi-faceted cooling refers to the case where the cooling system of the present application cools the cell 100.

[0061] Table 1

[0062]

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A cooling system for a battery pack, characterized in that: The invention comprises a cooling box (1), wherein a plurality of cooling baffles (2) arranged at intervals and in parallel are arranged inside the cooling box (1), and a plurality of cavities are formed, wherein the cavities are used to accommodate battery cells (100), cooling channels are arranged on the side walls of the cooling box (1), on the bottom wall of the cooling box (1) and on the cooling baffles (2), and the cooling channels are interconnected to form a cooling circulation channel, and a cooling medium inlet (3) is arranged at one end of the cooling circulation channel, and a cooling medium outlet (4) is arranged at the other end.

2. The cooling system of the battery pack according to claim 1, characterized in that: The two side walls of the cooling box (1) parallel to the cooling baffle (2) are respectively a first side wall (11) and a second side wall (12); the first side wall (11), the cooling baffle (2) and the second side wall (12) are provided with first cooling channels (5) and second cooling channels (6) in an alternating manner; and the cooling channel on the bottom wall of the cooling box (1) is a third cooling channel (7); One end of the first cooling channel (5) is respectively connected to the cooling medium inlet (3), the other end of the first cooling channel (5) is respectively connected to the third cooling channel (7), one end of the second cooling channel (6) is respectively connected to the third cooling channel (7), the other end of the second cooling channel (6) is respectively connected to the cooling medium outlet (4), and the first cooling channel (5), the second cooling channel (6) and the third cooling channel (7) form the cooling circulation channel.

3. The cooling system of the battery pack according to claim 2, characterized in that: The bottom wall of the cooling box (1) comprises a bottom cooling bottom plate (15) and a bottom cooling upper plate (16) which are arranged in a stacked manner, the third cooling channel (7) being arranged on the bottom cooling bottom plate (15), and a plurality of connecting channels (17) being arranged on the bottom cooling upper plate (16), the connecting channels (17) connecting the first cooling channel (5) and the third cooling channel (7), or connecting the second cooling channel (6) and the third cooling channel (7).

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

5. The cooling system of the battery pack according to claim 2, characterized in that: A side wall of the cooling box body (1) perpendicular to the cooling baffle (2) is a third side wall (13); a connecting plate (8) is provided inside the cooling box body (1); the connecting plate (8) is arranged close to the third side wall (13) and is parallel to the third side wall (13); a cooling medium shunt channel (81) is provided on the connecting plate (8); the cooling medium shunt channel (81) is connected to the first cooling channel (5) and the cooling medium inlet (3).

6. The cooling system of the battery pack according to claim 2, characterized in that: Another side wall of the cooling box (1) perpendicular to the cooling baffle (2) is a fourth side wall (14), and a cooling medium converging channel (19) is provided on the fourth side wall (14), and the cooling medium converging channel (19) is connected to the second cooling channel (6) and the cooling medium outlet (4).

7. The cooling system of the battery pack according to any one of claims 1 to 6, characterized in that: The cooling baffle (2) extends along the width direction of the battery core (100) placed in the cavity; Alternatively, the cooling baffle (2) extends along the length direction of the battery core (100) placed in the cavity.

8. The cooling system of the battery pack according to any one of claims 1 to 6, characterized in that: It also includes a cover plate (9), a first extension plate (91) extending from the circumferential edge of the cover plate (9), a second extension plate (18) extending from the circumferential edge of the opening of the cooling box body (1), the cover plate (9) being buckled onto the cooling box body (1), and the first extension plate (91) and the second extension plate (18) being fitted together.

9. The cooling system of the battery pack according to any one of claims 1 to 6, characterized in that: The cooling baffle (2) and the cooling box body (1) are an integrally formed structure.

10. A battery pack, characterized in that: A cooling system for a battery pack comprising a battery cell (100) and any one of claims 1 to 9.

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