Battery pack, battery module and energy storage all-in-one machine

Abstract

The utility model provides a battery pack, a battery module and an energy storage all-in-one machine, and the battery pack comprises a shell provided with an accommodating cavity; the battery cell assembly is arranged in the accommodating cavity, and the battery cell assembly comprises a plurality of battery cells; the cooling cavity is arranged between any two adjacent battery cells, and / or the cooling cavity is arranged between any battery cell and the inner wall of the shell; and the conductive part is arranged on the outer side of the cooling cavity and is electrically connected with the battery core assembly. The conductive part is arranged on the outer side of the cooling cavity, so that the heat dissipation effect of the battery cell can be ensured, the conductive part is prevented from being in direct contact with the cooling liquid, the conductive part is prevented from being damaged due to being polluted by the cooling liquid, the reliability of the battery pack is improved, and the normal work of the battery pack is ensured. In addition, the cooling liquid is separated from the conductive part, so that the product processing requirements of the battery cell, the conductive part and the cooling liquid can be reduced, and the production cost of the battery pack can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and more specifically, to a battery pack, a battery module and an energy storage integrated machine. Background Art

[0002] At present, with the development of lithium-ion battery technology, the battery capacity and energy density are continuously improved, and the battery generates more heat during operation. Common thermal management solutions, such as using a liquid cooling plate to dissipate heat from the bottom surface of the battery cell, cannot meet the heat dissipation requirements, resulting in a large temperature gradient in the height direction of the battery cell, premature attenuation of the battery cell life and health, rapid attenuation of the system life, and even the risk of thermal runaway of the battery cell caused by local overheating in severe cases.

[0003] In related technologies, to improve the heat dissipation efficiency of the battery pack, an immersion liquid cooling design is adopted, that is, the battery and electrical components are immersed in the coolant together. However, the electrical components are in contact with the coolant and are easily contaminated by the coolant, affecting the normal operation of the battery. Summary of the Utility Model

[0004] The embodiments of the utility model aim to solve at least one of the technical problems existing in the prior art.

[0005] For this reason, in the first aspect of the embodiments of the utility model, a battery pack is provided.

[0006] In the second aspect of the embodiments of the utility model, a battery module is provided.

[0007] In the third aspect of the embodiments of the utility model, an energy storage integrated machine is provided.

[0008] In view of this, according to the first aspect of the embodiments of the utility model, a battery pack is provided, the battery pack includes: a housing, the housing is provided with a receiving cavity; a battery cell assembly, arranged in the receiving cavity, the battery cell assembly includes a plurality of battery cells; a cooling cavity, arranged between any two adjacent battery cells, and / or the cooling cavity is arranged between any one battery cell and the inner wall of the housing; a conductive part, arranged outside the cooling cavity and electrically connected to the battery cell assembly.

[0009] The battery pack provided by the embodiments of the utility model includes a housing, a battery cell assembly, a cooling cavity and a conductive part. Specifically, the battery cell assembly is arranged in the receiving cavity, the battery cell assembly includes a plurality of battery cells, and optionally, the plurality of battery cells are arranged along the width direction of the battery cell assembly.

[0010] A cooling cavity is provided between any two adjacent battery cells. Alternatively, a cooling cavity is provided between any one battery cell and the inner wall of the housing. Alternatively, a cooling cavity is provided between any two adjacent battery cells, and a cooling cavity is provided between any one battery cell and the inner wall of the housing. Specifically, it can be set according to actual needs. That is to say, the cooling cavity for cooling the battery pack is integrated in the housing.

[0011] It can be understood that the coolant circulates in the cooling cavity. That is to say, there is flowing coolant between any two adjacent battery cells and / or between any one battery cell and the inner wall of the housing, that is, the coolant is in direct contact with the battery cells, so as to effectively dissipate heat from multiple battery cells of the battery cell assembly, significantly reduce the temperature gradient in the height direction of the battery cells, and the temperature difference between multiple battery cells, improve the overall heat dissipation effect of the battery pack, meet the heat dissipation requirements of large-capacity and high-density battery packs, reduce the risk of thermal runaway of the battery cells caused by local overheating of the battery pack, and is beneficial to extending the service life of the battery pack.

[0012] Since the conductive part is arranged outside the cooling cavity, it can ensure the heat dissipation effect of the battery cells while preventing the conductive part from being in direct contact with the coolant, avoiding damage to the conductive part due to being contaminated by the coolant, improving the reliability of the battery pack, and thus ensuring the normal operation of the battery pack.

[0013] In addition, since the coolant and the conductive part are separated, it can also reduce the product processing requirements for the battery cells, the conductive part and the coolant, which is beneficial to reducing the production cost of the battery pack.

[0014] In addition, according to the battery pack provided by the above technical solution of the present invention, it also has the following additional technical features:

[0015] In some technical solutions, optionally, each battery cell includes two opposite first surfaces and a plurality of second surfaces, the plurality of second surfaces are located between the two first surfaces and are respectively connected to the two first surfaces, and the area of the first surface is larger than the area of each second surface; wherein, the cooling cavity is arranged between the first surfaces of any two adjacent battery cells, and / or the cooling cavity is located between the first surface of any one battery cell and the inner wall of the housing.

[0016] In this technical solution, it is defined that each battery cell includes two opposite first surfaces and a plurality of second surfaces. Specifically, the plurality of second surfaces are located between the two first surfaces, and the plurality of second surfaces are respectively connected to the two first surfaces. Optionally, the number of the second surfaces is four, and the four second surfaces and the two first surfaces form a cuboid structure, that is, the battery cell is a blade battery cell.

[0017] The area of the first side is larger than the area of each second side. The cooling cavity is arranged between the first sides of any two adjacent battery cells, and / or the cooling cavity is arranged between the first side of any battery cell and the inner wall of the housing. That is to say, the side with a larger area in the battery cell is directly contacted with the coolant for heat dissipation of the battery cell, which increases the heat dissipation area of the battery cell, thereby significantly improving the heat dissipation effect of the battery cell assembly and prolonging the service life of the battery cell.

[0018] Specifically, during the process of the coolant circulating in the cooling cavity, after fully contacting the side with a larger area in the battery cell, the heat generated by the battery cell is transferred to the coolant, and the coolant that absorbs the heat flows out of the cooling cavity, thereby fully dissipating the heat of the battery cell, greatly reducing the temperature gradient of the battery cell in the height direction, reducing the temperature difference between multiple battery cells, improving the heat dissipation efficiency of the battery pack, meeting the heat dissipation requirements of large-capacity and high-density battery packs, reducing the risk of thermal runaway of the battery cell caused by local overheating of the battery pack, and prolonging the service life of the battery pack.

[0019] Optionally, the conductive part is arranged on the second side of the battery cell.

[0020] In some technical solutions, optionally, the housing is provided with a liquid inlet groove and a liquid outlet groove, and the liquid inlet groove and the liquid outlet groove are respectively located on both sides in the height direction of the battery cell assembly and are respectively communicated with the cooling cavity.

[0021] In this technical solution, it is defined that the housing is provided with a liquid inlet groove and a liquid outlet groove. Specifically, along the height direction of the battery cell assembly, the liquid inlet groove and the liquid outlet groove are respectively located on both sides of the battery cell assembly. That is to say, during the process of the coolant circulating, the coolant enters between any two adjacent battery cells from the top of the battery cell assembly, and / or the coolant enters between the battery cell and the inner wall of the housing from the top of the battery cell assembly, and after fully contacting the battery cell for heat exchange, it flows out from the bottom of the battery cell assembly, realizing efficient heat dissipation of multiple battery cells, reducing the temperature difference between multiple battery cells, and further reducing the temperature gradient of the battery cell in the height direction while meeting the heat dissipation requirements, prolonging the service life of the battery cell, and ensuring the normal operation of the battery cell.

[0022] In some technical solutions, optionally, along the length direction of the battery cell assembly, the battery cell assembly includes a first end and a second end facing away from each other, the conductive part includes a first tab and a second tab, the first tab is arranged at the first end, and the second tab is arranged at the second end; wherein, the liquid inlet groove is configured to be close to the first end, and / or the liquid inlet groove is configured to be close to the second end.

[0023] In this technical solution, it is defined that the conductive part includes a first tab and a second tab. Optionally, the number of the first tabs is multiple, the number of the second tabs is multiple, and one first tab and one second tab are respectively arranged at both ends in the length direction of any battery cell.

[0024] It can be understood that during the charging and discharging process of the battery pack, the temperatures at the two sides of the first tab and the second tab will be higher than the temperature in the middle part of the battery cell.

[0025] The liquid inlet groove is close to the first end of the battery cell assembly. Or, the liquid inlet groove is close to the second end of the battery cell assembly. Or, the number of liquid inlet grooves is two, one of which is close to the first end of the battery cell assembly and the other is close to the second end of the battery cell assembly. Specifically, it can be set according to actual needs. Since the first tab and the second tab are respectively located at the first end and the second end of the battery cell assembly, that is to say, the liquid inlet groove is arranged close to the first tab and / or the second tab.

[0026] Due to the higher temperatures at the positions of the first tab and the second tab on both sides in the length direction of the battery cell, by arranging the liquid inlet groove close to the first tab and / or the second tab, during the circulation of the coolant, the coolant can fully contact the position with larger heat generation for heat transfer, thereby further improving the heat dissipation efficiency of the battery cell, extending the service life of the battery cell and the battery pack, and enhancing the reliability of the battery pack.

[0027] In some technical solutions, optionally, the liquid outlet groove is configured to be arranged close to the middle part of the battery cell assembly.

[0028] In this technical solution, it is defined that the liquid outlet groove is arranged close to the middle part of the battery cell assembly. Since the liquid inlet groove and the liquid outlet groove are respectively arranged on both sides in the height direction of the battery cell assembly, and the liquid inlet groove is close to the first end and / or the second end of the battery cell assembly, when the coolant circulates, the coolant enters the cooling cavity from at least one side of the battery cell assembly and then flows out from the liquid outlet groove close to the middle part of the battery cell assembly, which is beneficial to extending the flow path of the coolant in the cooling cavity, enabling the coolant to fully contact the battery cell for heat exchange, taking away as much heat generated by the battery cell as possible, thereby significantly improving the heat dissipation effect of the battery cell, reducing the temperature difference between multiple battery cells, avoiding the risk of thermal runaway of the battery cell due to local overheating, enhancing the safety and reliability of the battery pack, and extending the service life of the battery pack.

[0029] In some technical solutions, optionally, the housing is further provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the liquid inlet groove, and the liquid outlet is communicated with the liquid outlet groove; wherein, the liquid inlet and the liquid outlet are respectively located on the same side of the housing.

[0030] In this technical solution, it is defined that the housing is further provided with a liquid inlet and a liquid outlet. Specifically, the liquid inlet is communicated with the liquid inlet groove, and the liquid outlet is communicated with the liquid outlet groove. Optionally, the battery pack further includes a coolant circulation device, and the coolant circulation device includes an inlet and an outlet, the inlet is communicated with the liquid outlet, and the outlet is communicated with the liquid inlet.

[0031] Specifically, the coolant of the coolant circulation device flows out from the outlet, enters the liquid inlet tank through the liquid inlet, enters the cooling cavity via the liquid inlet tank, makes full contact with the battery cells for heat exchange, and then the coolant that has absorbed heat flows from the liquid outlet tank to the liquid outlet, and flows through the liquid outlet to the inlet of the coolant circulation device, and then flows back into the coolant circulation device to achieve sufficient heat dissipation of the battery cells.

[0032] The liquid inlet and the liquid outlet are located on the same side of the housing, which is convenient for the pipeline layout between the coolant circulation device and the liquid inlet and the liquid outlet, ensuring that the coolant can make full contact with each battery cell for heat exchange during the process of circulating flow, improving the heat dissipation effect while being beneficial to reducing the production cost of the battery pack.

[0033] In some technical solutions, optionally, the liquid inlet tank includes a first tank section and a second tank section. Along the length direction of the battery cell assembly, the second tank section is located outside the first tank section; wherein, one end of the first tank section is communicated with the liquid inlet, the other end of the first tank section is communicated with the second tank section, and the second tank section is communicated with the cooling cavity.

[0034] In this technical solution, it is defined that the liquid inlet tank includes a first tank section and a second tank section. Specifically, one end of the first tank section is communicated with the liquid inlet, the other end is communicated with the second tank section, and the second tank section is communicated with the coolant. That is to say, after the coolant enters from the liquid inlet, it does not directly flow into the cooling cavity, but flows from one end to the end in the first tank section and then enters the cooling cavity through the second tank section, so as to ensure that the flow lengths of the coolant flowing through each battery cell are kept similar, so that the coolant flow rates flowing to each battery cell are kept uniform, and further the thermal management effects of each battery cell are made to approach consistency, which is beneficial to reducing the temperature difference between multiple battery cells and avoiding the risk of thermal runaway due to local overheating of a single battery cell, further improving the safety and reliability of the battery pack and prolonging the service life of the battery pack.

[0035] Since along the length direction of the battery cell assembly, the second tank section is located outside the first tank section, that is to say, the second tank section is closer to the first end or the second end of the battery cell assembly than the first tank section, that is, the second tank section is closer to the first tab or the second tab on both sides of the battery cell assembly in the length direction. During the process of the coolant circulating and flowing, the coolant can make full contact with the position with larger heat generation for heat transfer, so as to further improve the heat dissipation efficiency of the battery cell.

[0036] It can be understood that since multiple battery cells are arranged along the width direction of the battery cell assembly, therefore, the first tank section and the second tank section respectively extend along the width direction of the battery cell assembly to ensure that the coolant can make contact with each battery cell for heat transfer.

[0037] In some technical solutions, optionally, one end of the second groove section communicates with the first groove section; the battery pack further includes a plugging portion, which is disposed at the other end of the second groove section for plugging the second groove section.

[0038] In this technical solution, it is defined that the battery pack further includes a plugging portion. Specifically, one end of the second groove section communicates with the first groove section, and the plugging portion is arranged at the other end of the second groove section. It can be understood that for the convenience of the processing and manufacturing of the liquid inlet groove, the other end of the second groove section generally penetrates the housing, and the plugging portion is arranged at the other end of the second groove section for plugging, ensuring that the coolant does not leak when flowing in the second groove section, ensuring the reliable sealing of the flow channel, thereby avoiding the situation that the conductive portion is damaged due to the leakage of the coolant, and further ensuring the normal operation of the battery pack.

[0039] Optionally, the number of the plugging portions is two. One plugging portion is arranged at one end of the second groove section, and the other plugging portion is arranged at the other end of the second groove section, that is, plugging portions are arranged at both ends of the second groove section, which means that both ends of the second groove section penetrate the housing. By arranging the plugging portions for plugging, while ensuring the effective communication between the first groove section and the second groove section, it is beneficial to improve the sealing performance of the flow channel.

[0040] In some technical solutions, optionally, the battery pack further includes a sealing assembly, which is disposed in the accommodating cavity and located between the inner wall of the housing and the battery cell assembly for sealing the cooling cavity.

[0041] In this technical solution, it is defined that the battery pack further includes a sealing assembly. Specifically, the sealing assembly is arranged in the accommodating cavity, and the sealing assembly is arranged between the inner wall of the housing and the battery cell assembly for sealing the cooling cavity, improving the sealing performance of the cooling cavity. Thus, during the process of the coolant circulating in the cooling cavity, it can fully contact the battery cells for heat exchange, enabling the battery cells to dissipate heat fully, while avoiding the situation that the conductive portion is damaged due to the leakage of the coolant, further ensuring the sealed separation between the coolant and the conductive portion, and further ensuring the normal operation of the battery pack and extending the service life of the battery pack.

[0042] In some technical solutions, optionally, the sealing assembly includes a first sealing plate and a second sealing plate. Along the height direction of the battery cell assembly, the first sealing plate and the second sealing plate are respectively located on both sides of the battery cell assembly; wherein, the first sealing plate is provided with a first avoidance opening, and the liquid inlet groove communicates with the cooling cavity through the first avoidance opening; the second sealing plate is provided with a second avoidance opening, and the cooling cavity communicates with the liquid outlet groove through the second avoidance opening.

[0043] In this technical solution, it is defined that the sealing assembly includes a first sealing plate and a second sealing plate. Specifically, along the height direction of the battery cell assembly, the first sealing plate and the second sealing plate are respectively located on both sides of the battery cell assembly. Optionally, the first sealing plate is located at the top of the battery cell assembly, and the second sealing plate is located at the bottom of the battery cell assembly, so as to seal the cooling cavity on both sides in the height direction, improve the sealing effect of the cooling cavity, further avoid the leakage of the coolant to pollute the conductive part, and then cause the damage of the conductive part, ensure the sealed separation between the coolant and the conductive part, and ensure the normal operation of the battery pack.

[0044] The first sealing plate is provided with a first avoidance opening, and the liquid inlet groove is communicated with the cooling cavity through the first avoidance opening. The second sealing plate is provided with a second avoidance opening, and the cooling cavity is communicated with the liquid outlet groove through the second avoidance opening.

[0045] Specifically, during the process of the coolant circulating and flowing, the coolant enters from the liquid inlet groove at the top of the battery cell assembly, enters the cooling cavity after passing through the first avoidance opening, fully contacts the battery cells for heat exchange, and then flows out from the liquid outlet groove through the second avoidance opening at the bottom of the battery cell assembly. It realizes the efficient heat dissipation of multiple battery cells, reduces the temperature difference between multiple battery cells, and further reduces the temperature gradient of the battery cells in the height direction, meets the heat dissipation requirements, prolongs the service life of the battery cells, and ensures the normal operation of the battery cells.

[0046] In some technical solutions, optionally, the housing includes a first plate body, a second plate body, two end plates and a baffle. Among them, along the height direction of the battery cell assembly, the first plate body and the second plate body are respectively located on both sides of the battery cell assembly. Along the width direction of the battery cell assembly, the two end plates are respectively located on both sides of the battery cell assembly. The baffle is arranged between any two adjacent battery cells, and / or the baffle is arranged between any adjacent battery cell and the end plate. Along the height direction of the battery cell assembly, both ends of the baffle are respectively abutted against the first plate body and the second plate body; based on the baffle being arranged between any two adjacent battery cells, the first plate body, the second plate body, any two adjacent battery cells and the baffle enclose to form a cooling cavity; based on the baffle being arranged between any adjacent battery cell and the end plate, the first plate body, the second plate body, any adjacent battery cell and the end plate and the baffle enclose to form a cooling cavity.

[0047] In this technical solution, it is defined that the housing includes a first plate body, a second plate body, two end plates and a baffle. Specifically, along the height direction of the battery cell assembly, the first plate body and the second plate body are respectively located on both sides of the battery cell assembly. Optionally, the first plate body is the top plate, and the second plate body is the bottom plate.

[0048] The two end plates are respectively located on both sides in the width direction of the battery cell assembly. It can be understood that since multiple battery cells are arranged along the width direction of the battery cell assembly, that is to say, one end plate is adjacent to the first battery cell, and the other end plate is adjacent to the last battery cell.

[0049] The baffle is arranged between any two adjacent battery cells. Alternatively, the baffle is arranged between any adjacent end plate and battery cell. Alternatively, baffles are arranged between any two adjacent battery cells and between any adjacent end plate and battery cell.

[0050] Specifically, when the baffle is arranged between any two adjacent battery cells, the first plate body, the second plate body, any two adjacent battery cells and the baffle enclose to form a cooling cavity. When the coolant flows in the cooling cavity, heat exchange can be performed on the two adjacent battery cells. When the baffle is arranged between any adjacent end plate and battery cell, the first plate body, the second plate body, any adjacent battery cell and end plate and the baffle enclose to form a cooling cavity. When the coolant flows in the cooling cavity, heat exchange can be performed on the battery cell adjacent to the end plate.

[0051] Optionally, the baffle includes a first blocking portion and a second blocking portion. The first blocking portion and the second blocking portion are arranged along the length direction of the battery cell assembly to block both sides in the length direction of the cooling cavity.

[0052] In some technical solutions, optionally, along the width direction of the battery cell assembly, the gap d1 between any two adjacent battery cells satisfies 1mm ≤ d1 ≤ 5mm; and / or along the width direction of the battery cell assembly, the gap d2 between any adjacent battery cell and end plate satisfies 1mm ≤ d2 ≤ 5mm.

[0053] In this technical solution, the gap between any two adjacent battery cells is limited to be between 1mm and 5mm. Since the baffle is arranged between any two adjacent battery cells, that is to say, the width of the baffle is between 1mm and 5mm, which means the width of the formed cooling cavity is between 1mm and 5mm. Thus, while ensuring that the coolant flows between any two adjacent battery cells for efficient heat dissipation, it can be avoided that the overall volume of the battery pack is too large due to the excessive distance between two adjacent battery cells.

[0054] The gap between any adjacent battery cell and end plate is between 1mm and 5mm. Since the baffle is arranged between any adjacent battery cell and end plate, that is to say, the width of the baffle is between 1mm and 5mm, which means the width of the formed cooling cavity is between 1mm and 5mm. Thus, while ensuring that the coolant flows between any two adjacent battery cells for efficient heat dissipation, it can be avoided that the overall volume of the battery pack is too large due to the excessive distance between two adjacent battery cells.

[0055] According to the second aspect of the present invention, there is provided a battery module, including the battery pack provided in any of the above technical solutions, and thus having all the beneficial technical effects of the battery pack, which will not be elaborated herein.

[0056] According to the third aspect of the present utility model, there is provided an integrated energy storage device, including the battery pack or battery module provided in any of the above technical solutions, and thus having all the beneficial technical effects of the battery pack or battery module, which will not be elaborated herein again.

[0057] The additional aspects and advantages of the present utility model will be given in the following description section, some will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0059] Figure 1 An exploded view of a battery pack according to an embodiment of the present utility model is shown;

[0060] Figure 2 A first structural schematic diagram of a battery pack according to an embodiment of the present utility model is shown;

[0061] Figure 3 A second structural schematic diagram of a battery pack according to an embodiment of the present utility model is shown;

[0062] Figure 4 A structural schematic diagram of a first plate body according to an embodiment of the present utility model is shown.

[0063] Wherein, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0064] 100 battery pack, 110 housing, 111 accommodating cavity, 112 liquid inlet groove, 113 liquid outlet groove, 114 liquid inlet port, 115 liquid outlet port, 116 first groove section, 117 second groove section, 120 battery cell assembly, 121 battery cell, 122 first surface, 123 second surface, 124 first end, 125 second end, 130 cooling cavity, 140 conductive part, 141 first tab, 142 second tab, 150 sealing part, 160 sealing assembly, 161 first sealing plate, 162 second sealing plate, 163 first avoidance opening, 164 second avoidance opening, 170 first plate body, 180 second plate body, 190 end plate, 210 baffle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described in detail below in conjunction with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0066] In the following description, numerous specific details are set forth to provide a thorough understanding of the present utility model. However, the present utility model may be implemented in other ways different from those described herein. Therefore, the scope of protection of the present utility model is not limited by the specific embodiments disclosed below.

[0067] Reference is now made to Figures 1 to 4 to describe a battery pack 100, a battery module, and an energy storage integrated machine provided according to some embodiments of the present utility model.

[0068] In an embodiment according to the present application, as Figure 1 、 Figure 2 and Figure 3 shown, a battery pack 100 is proposed. The battery pack 100 includes: a housing 110 provided with a receiving cavity 111; a battery cell assembly 120 disposed in the receiving cavity 111, the battery cell assembly 120 including a plurality of battery cells 121; a cooling cavity 130 disposed between any two adjacent battery cells 121, and / or the cooling cavity 130 disposed between any one battery cell 121 and the inner wall of the housing 110; and a conductive portion 140 disposed outside the cooling cavity 130 and electrically connected to the battery cell assembly 120.

[0069] The battery pack 100 provided by the embodiments of the present utility model includes a housing 110, a battery cell assembly 120, a cooling cavity 130, and a conductive portion 140. Specifically, the battery cell assembly 120 is disposed in the receiving cavity 111, and the battery cell assembly 120 includes a plurality of battery cells 121. Optionally, the plurality of battery cells 121 are arranged along the width direction of the battery cell assembly 120.

[0070] A cooling cavity 130 is provided between any two adjacent battery cells 121. Or, a cooling cavity 130 is provided between any one battery cell 121 and the inner wall of the housing 110. Or, a cooling cavity 130 is provided between any two adjacent battery cells 121, and a cooling cavity 130 is provided between any one battery cell 121 and the inner wall of the housing 110. Specifically, it can be set according to actual needs. That is to say, the cooling cavity 130 for cooling the battery pack 100 is integrated in the housing 110.

[0071] It can be understood that the coolant circulates in the cooling cavity 130. That is to say, there is flowing coolant between any two adjacent battery cells 121, and / or between any one battery cell 121 and the inner wall of the housing 110, that is, the coolant is in direct contact with the battery cells 121, so as to effectively dissipate heat from the plurality of battery cells 121 of the battery cell assembly 120, significantly reduce the temperature gradient in the height direction of the battery cells 121, as well as the temperature difference between the plurality of battery cells 121, improve the overall heat dissipation effect of the battery pack 100, meet the heat dissipation requirements of large-capacity and high-density battery packs 100, reduce the risk of thermal runaway of the battery cells 121 caused by local overheating of the battery pack 100, and is beneficial to extending the service life of the battery pack 100.

[0072] Since the conductive part 140 is arranged outside the cooling cavity 130, it is possible to ensure the heat dissipation effect of the battery cell 121 while preventing the conductive part 140 from directly contacting the coolant, avoiding damage to the conductive part 140 due to being contaminated by the coolant, improving the reliability of the battery pack 100, and further ensuring the normal operation of the battery pack 100.

[0073] In addition, since the coolant and the conductive part 140 are separated, it is also possible to reduce the product processing requirements for the battery cell 121, the conductive part 140, and the coolant, which is beneficial to reducing the production cost of the battery pack 100.

[0074] As Figure 1 shown, in some embodiments, optionally, each battery cell 121 includes two opposite first surfaces 122 and a plurality of second surfaces 123. The plurality of second surfaces 123 are located between the two first surfaces 122 and are respectively connected to the two first surfaces 122. The area of the first surface 122 is larger than the area of each second surface 123. Among them, the cooling cavity 130 is arranged between the first surfaces 122 of any two adjacent battery cells 121, and / or the cooling cavity 130 is located between the first surface 122 of any battery cell 121 and the inner wall of the housing 110.

[0075] In this embodiment, it is defined that each battery cell 121 includes two opposite first surfaces 122 and a plurality of second surfaces 123. Specifically, the plurality of second surfaces 123 are located between the two first surfaces 122, and the plurality of second surfaces 123 are respectively connected to the two first surfaces 122. Optionally, the number of the second surfaces 123 is four, and the four second surfaces 123 and the two first surfaces 122 form a cuboid structure, that is, the battery cell 121 is a blade battery cell 121.

[0076] The area of the first surface 122 is larger than the area of each second surface 123. The cooling cavity 130 is arranged between the first surfaces 122 of any two adjacent battery cells 121, and / or the cooling cavity 130 is arranged between the first surface 122 of any battery cell 121 and the inner wall of the housing 110. That is to say, the larger surface area of the battery cell 121 is directly contacted with the coolant for heat dissipation of the battery cell 121, that is, the heat dissipation area of the battery cell 121 is increased, so that the heat dissipation effect of the battery cell assembly 120 can be significantly improved, and the service life of the battery cell 121 can be extended.

[0077] Specifically, during the process of the coolant circulating in the cooling chamber 130, after fully contacting the surface with a larger area in the battery cell 121, the heat generated by the battery cell 121 is transferred to the coolant, and the coolant that absorbs the heat flows out of the cooling chamber 130, thereby sufficiently dissipating the heat of the battery cell 121, greatly reducing the temperature gradient of the battery cell 121 in the height direction, reducing the temperature difference between multiple battery cells 121, improving the heat dissipation efficiency of the battery pack 100, meeting the heat dissipation requirements of the large-capacity and high-density battery pack 100, reducing the risk of thermal runaway of the battery cell 121 caused by local overheating of the battery pack 100, and extending the service life of the battery pack 100.

[0078] Optionally, the conductive part 140 is arranged on the second surface 123 of the battery cell 121.

[0079] As Figure 1 and Figure 2 shown, in some embodiments, optionally, the housing 110 is provided with an inlet liquid groove 112 and an outlet liquid groove 113, and the inlet liquid groove 112 and the outlet liquid groove 113 are respectively located on both sides of the battery cell assembly 120 in the height direction and are respectively communicated with the cooling chamber 130.

[0080] In this embodiment, it is defined that the housing 110 is provided with an inlet liquid groove 112 and an outlet liquid groove 113. Specifically, along the height direction of the battery cell assembly 120, the inlet liquid groove 112 and the outlet liquid groove 113 are respectively located on both sides of the battery cell assembly 120. That is to say, during the process of the coolant circulating, the coolant enters between any two adjacent battery cells 121 from the top of the battery cell assembly 120, and / or the coolant enters between the battery cell 121 and the inner wall of the housing 110 from the top of the battery cell assembly 120. After fully contacting the battery cell 121 for heat exchange, it flows out from the bottom of the battery cell assembly 120, realizing efficient heat dissipation of multiple battery cells 121, reducing the temperature difference between multiple battery cells 121, further reducing the temperature gradient of the battery cell 121 in the height direction, meeting the heat dissipation requirements, extending the service life of the battery cell 121, and ensuring the normal operation of the battery cell 121.

[0081] As Figure 1 、 Figure 2 and Figure 3 shown, in some embodiments, optionally, along the length direction of the battery cell assembly 120, the battery cell assembly 120 includes a first end 124 and a second end 125 that face away from each other. The conductive part 140 includes a first tab 141 and a second tab 142. The first tab 141 is arranged at the first end 124, and the second tab 142 is arranged at the second end 125; wherein, the inlet liquid groove 112 is configured to be close to the first end 124, and / or the inlet liquid groove 112 is configured to be close to the second end 125.

[0082] In this embodiment, it is defined that the conductive part 140 includes a first tab 141 and a second tab 142. Optionally, the number of the first tabs 141 is multiple, and the number of the second tabs 142 is multiple. One first tab 141 and one second tab 142 are respectively arranged at both ends of any battery cell 121 in the length direction.

[0083] It can be understood that during the charging and discharging process of the battery pack 100, the temperatures at the first tabs 141 and the second tabs 142 on both sides are higher than the temperature of the middle part of the battery cell 121.

[0084] The liquid inlet groove 112 is close to the first end 124 of the battery cell assembly 120. Or, the liquid inlet groove 112 is close to the second end 125 of the battery cell assembly 120. Or, the number of the liquid inlet grooves 112 is two, one of the liquid inlet grooves 112 is close to the first end 124 of the battery cell assembly 120, and the other liquid inlet groove 112 is close to the second end 125 of the battery cell assembly 120. Specifically, it can be set according to actual needs. Since the first tab 141 and the second tab 142 are respectively located at the first end 124 and the second end 125 of the battery cell assembly 120, that is to say, the liquid inlet groove 112 is arranged close to the first tab 141 and / or the second tab 142.

[0085] Since the temperatures at the positions where the first tabs 141 and the second tabs 142 are located on both sides of the battery cell 121 in the length direction are relatively high, by arranging the liquid inlet groove 112 close to the first tab 141 and / or the second tab 142, during the circulation of the coolant, the coolant can be in full contact with the position with a large amount of heat generation for heat transfer, so as to further improve the heat dissipation efficiency of the battery cell 121, extend the service life of the battery cell 121 and the battery pack 100, and improve the reliability of the battery pack 100.

[0086] Such as Figure 1 and Figure 2 As shown, in some embodiments, optionally, the liquid outlet groove 113 is configured to be arranged close to the middle of the battery cell assembly 120.

[0087] In this embodiment, it is defined that the liquid outlet groove 113 is arranged near the middle of the battery cell assembly 120. Since the liquid inlet groove 112 and the liquid outlet groove 113 are respectively arranged on both sides of the battery cell assembly 120 in the height direction, and the liquid inlet groove 112 is close to the first end 124 and / or the second end 125 of the battery cell assembly 120, when the coolant circulates, the coolant enters the cooling cavity 130 from at least one side of the battery cell assembly 120, and then flows out from the liquid outlet groove 113 near the middle of the battery cell assembly 120. This is beneficial to extending the flow path of the coolant in the cooling cavity 130, enabling the coolant to fully contact the battery cells 121 for heat exchange, taking away as much heat generated by the battery cells 121 as possible. Furthermore, it can significantly improve the heat dissipation effect of the battery cells 121, reduce the temperature difference between multiple battery cells 121, avoid the risk of thermal runaway of the battery cells 121 due to local overheating, enhance the safety and reliability of the battery pack 100, and extend the service life of the battery pack 100.

[0088] As Figure 3 shown, in some embodiments, optionally, the housing 110 is further provided with a liquid inlet 114 and a liquid outlet 115. The liquid inlet 114 is communicated with the liquid inlet groove 112, and the liquid outlet 115 is communicated with the liquid outlet groove 113; wherein, the liquid inlet 114 and the liquid outlet 115 are respectively located on the same side of the housing 110.

[0089] In this embodiment, it is defined that the housing 110 is further provided with a liquid inlet 114 and a liquid outlet 115. Specifically, the liquid inlet 114 is communicated with the liquid inlet groove 112, and the liquid outlet 115 is communicated with the liquid outlet groove 113. Optionally, the battery pack 100 further includes a coolant circulation device. The coolant circulation device includes an inlet and an outlet. The inlet is communicated with the liquid outlet 115, and the outlet is communicated with the liquid inlet 114.

[0090] Specifically, the coolant of the coolant circulation device flows out from the outlet, enters the liquid inlet groove 112 through the liquid inlet 114, enters the cooling cavity 130 via the liquid inlet groove 112, fully contacts the battery cells 121 for heat exchange, and then the coolant that has absorbed heat flows from the liquid outlet groove 113 to the liquid outlet 115, and flows through the liquid outlet 115 to the inlet of the coolant circulation device, and then flows back into the coolant circulation device, realizing the full heat dissipation of the battery cells 121.

[0091] The liquid inlet 114 and the liquid outlet 115 are located on the same side of the housing 110, which is convenient for the pipeline layout between the coolant circulation device and the liquid inlet 114 and the liquid outlet 115, ensuring that the coolant can fully contact each battery cell 121 for heat exchange during the circulation process, improving the heat dissipation effect while being beneficial to reducing the production cost of the battery pack 100.

[0092] As Figure 4As shown, in some embodiments, optionally, the liquid inlet tank 112 includes a first tank section 116 and a second tank section 117. Along the length direction of the battery cell assembly 120, the second tank section 117 is located outside the first tank section 116. Wherein, one end of the first tank section 116 communicates with the liquid inlet 114, the other end of the first tank section 116 communicates with the second tank section 117, and the second tank section 117 communicates with the cooling cavity 130.

[0093] In this embodiment, it is defined that the liquid inlet tank 112 includes a first tank section 116 and a second tank section 117. Specifically, one end of the first tank section 116 communicates with the liquid inlet 114, the other end communicates with the second tank section 117, and the second tank section 117 communicates with the coolant. That is to say, after the coolant enters from the liquid inlet 114, it does not directly flow into the cooling cavity 130, but flows from one end to the end in the first tank section 116 and then enters the cooling cavity 130 through the second tank section 117, so as to ensure that the flow lengths of the coolant flowing through each battery cell 121 are kept similar, so that the coolant flow rates flowing to each battery cell 121 are kept uniform, and further the thermal management effects of each battery cell 121 are made to approach consistency, which is beneficial to reducing the temperature difference between multiple battery cells 121, avoiding the risk of thermal runaway due to local overheating of a single battery cell 121, further improving the safety and reliability of the battery pack 100, and prolonging the service life of the battery pack 100.

[0094] Since along the length direction of the battery cell assembly 120, the second tank section 117 is located outside the first tank section 116, that is to say, the second tank section 117 is closer to the first end 124 or the second end 125 of the battery cell assembly 120 compared with the first tank section 116, that is, the second tank section 117 is closer to the first pole ear 141 or the second pole ear 142 on both sides of the battery cell assembly 120 in the length direction. During the process of the coolant circulating and flowing, the coolant can be in full contact with the position with larger heat generation for heat transfer, so as to further improve the heat dissipation efficiency of the battery cell 121.

[0095] It can be understood that since multiple battery cells 121 are arranged along the width direction of the battery cell assembly 120, therefore, the first tank section 116 and the second tank section 117 respectively extend along the width direction of the battery cell assembly 120 to ensure that the coolant can be in contact with each battery cell 121 for heat transfer.

[0096] As Figure 4 As shown, in some embodiments, optionally, one end of the second tank section 117 communicates with the first tank section 116; the battery pack 100 further includes a blocking part 150, and the blocking part 150 is arranged at the other end of the second tank section 117 for blocking the second tank section 117.

[0097] In this embodiment, it is defined that the battery pack 100 further includes a blocking part 150. Specifically, one end of the second groove section 117 communicates with the first groove section 116, and the blocking part 150 is arranged at the other end of the second groove section 117. It can be understood that for the convenience of the processing and manufacturing of the liquid inlet groove 112, the other end of the second groove section 117 generally penetrates the housing 110. By arranging the blocking part 150 at the other end of the second groove section 117 for blocking, it is ensured that the coolant does not leak when flowing in the second groove section 117, ensuring reliable sealing of the flow channel, thereby avoiding the situation that the conductive part 140 is damaged due to coolant leakage, and further ensuring the normal operation of the battery pack 100.

[0098] Optionally, the number of the blocking parts 150 is two. One blocking part 150 is arranged at one end of the second groove section 117, and the other blocking part 150 is arranged at the other end of the second groove section 117, that is, blocking parts 150 are arranged at both ends of the second groove section 117 for blocking, which means that both ends of the second groove section 117 penetrate the housing 110. By arranging the blocking parts 150 for blocking, while ensuring the effective communication between the first groove section 116 and the second groove section 117, it is beneficial to improve the sealing performance of the flow channel.

[0099] As Figure 1 and Figure 2 shown, in some embodiments, optionally, the battery pack 100 further includes a sealing assembly 160. The sealing assembly 160 is arranged in the accommodation cavity 111 and is located between the inner wall of the housing 110 and the battery cell assembly 120, and is used for sealing the cooling cavity 130.

[0100] In this embodiment, it is defined that the battery pack 100 further includes a sealing assembly 160. Specifically, the sealing assembly 160 is arranged in the accommodation cavity 111, and the sealing assembly 160 is arranged between the inner wall of the housing 110 and the battery cell assembly 120, and is used for sealing the cooling cavity 130 to improve the sealing performance of the cooling cavity 130. Thus, during the process of the coolant circulating and flowing in the cooling cavity 130, it can fully contact with the battery cell 121 for heat exchange, so that the battery cell 121 can fully dissipate heat, while avoiding the situation that the conductive part 140 is damaged due to coolant leakage, further ensuring the sealed separation between the coolant and the conductive part 140, and further ensuring the normal operation of the battery pack 100 and prolonging the service life of the battery pack 100.

[0101] As Figure 1 and Figure 2 ​As shown, in some embodiments, optionally, the sealing assembly 160 includes a first sealing plate 161 and a second sealing plate 162. Along the height direction of the battery cell assembly 120, the first sealing plate 161 and the second sealing plate 162 are respectively located on both sides of the battery cell assembly 120. Wherein, the first sealing plate 161 is provided with a first avoidance opening 163, and the liquid inlet groove 112 is communicated with the cooling cavity 130 through the first avoidance opening 163. The second sealing plate 162 is provided with a second avoidance opening 164, and the cooling cavity 130 is communicated with the liquid outlet groove 113 through the second avoidance opening 164.

[0102] In this embodiment, it is defined that the sealing assembly 160 includes a first sealing plate 161 and a second sealing plate 162. Specifically, along the height direction of the battery cell assembly 120, the first sealing plate 161 and the second sealing plate 162 are respectively located on both sides of the battery cell assembly 120. Optionally, the first sealing plate 161 is located at the top of the battery cell assembly 120, and the second sealing plate 162 is located at the bottom of the battery cell assembly 120, so as to seal the cooling cavity 130 on both sides in the height direction, improve the sealing effect of the cooling cavity 130, further avoid the coolant leakage from polluting the conductive part 140, and further avoid the situation that the conductive part 140 is damaged, ensure the sealed separation between the coolant and the conductive part 140, and ensure the normal operation of the battery pack 100.

[0103] The first sealing plate 161 is provided with a first avoidance opening 163, and the liquid inlet groove 112 is communicated with the cooling cavity 130 through the first avoidance opening 163. The second sealing plate 162 is provided with a second avoidance opening 164, and the cooling cavity 130 is communicated with the liquid outlet groove 113 through the second avoidance opening 164.

[0104] Specifically, during the circulation of the coolant, the coolant enters from the liquid inlet groove 112 at the top of the battery cell assembly 120, enters the cooling cavity 130 after passing through the first avoidance opening 163, fully contacts with the battery cells 121 for heat exchange, and then flows out from the liquid outlet groove 113 through the second avoidance opening 164 at the bottom of the battery cell assembly 120, realizing efficient heat dissipation of multiple battery cells 121, reducing the temperature difference between multiple battery cells 121, further reducing the temperature gradient of the battery cells 121 in the height direction, meeting the heat dissipation requirements, extending the service life of the battery cells 121, and ensuring the normal operation of the battery cells 121.

[0105] Such as Figure 1As shown, in some embodiments, optionally, the housing 110 includes a first plate 170, a second plate 180, two end plates 190, and a baffle 210. Among them, along the height direction of the battery cell assembly 120, the first plate 170 and the second plate 180 are respectively located on both sides of the battery cell assembly 120. Along the width direction of the battery cell assembly 120, the two end plates 190 are respectively located on both sides of the battery cell assembly 120. The baffle 210 is disposed between any two adjacent battery cells 121, and / or the baffle 210 is disposed between any adjacent battery cell 121 and the end plate 190. Along the height direction of the battery cell assembly 120, both ends of the baffle 210 are respectively abutted against the first plate 170 and the second plate 180. Based on the baffle 210 being disposed between any two adjacent battery cells 121, the first plate 170, the second plate 180, any two adjacent battery cells 121, and the baffle 210 enclose a cooling cavity 130. Based on the baffle 210 being disposed between any adjacent battery cell 121 and the end plate 190, the first plate 170, the second plate 180, any adjacent battery cell 121 and the end plate 190, and the baffle 210 enclose a cooling cavity 130.

[0106] In this embodiment, it is defined that the housing 110 includes a first plate 170, a second plate 180, two end plates 190, and a baffle 210. Specifically, along the height direction of the battery cell assembly 120, the first plate 170 and the second plate 180 are respectively located on both sides of the battery cell assembly 120. Optionally, the first plate 170 is the top plate, and the second plate 180 is the bottom plate.

[0107] The two end plates 190 are respectively located on both sides in the width direction of the battery cell assembly 120. It can be understood that since multiple battery cells 121 are arranged along the width direction of the battery cell assembly 120, that is to say, one of the end plates 190 is adjacent to the first battery cell 121, and the other end plate 190 is adjacent to the last battery cell 121.

[0108] The baffle 210 is disposed between any two adjacent battery cells 121. Or, the baffle 210 is disposed between any adjacent end plate 190 and the battery cell 121. Or, the baffle 210 is disposed between any two adjacent battery cells 121 and between any adjacent end plate 190 and the battery cell 121.

[0109] Specifically, when the baffle 210 is disposed between any two adjacent battery cells 121, the first plate body 170, the second plate body 180, any two adjacent battery cells 121, and the baffle 210 enclose to form a cooling cavity 130. When the coolant flows in the cooling cavity 130, heat exchange can be performed on the two adjacent battery cells 121. When the baffle 210 is disposed between any adjacent end plate 190 and battery cell 121, the first plate body 170, the second plate body 180, any adjacent battery cell 121 and end plate 190, and the baffle 210 enclose to form a cooling cavity 130. When the coolant flows in the cooling cavity 130, heat exchange can be performed on the battery cell 121 adjacent to the end plate 190.

[0110] Optionally, the baffle 210 includes a first blocking portion and a second blocking portion. The first blocking portion and the second blocking portion are arranged along the length direction of the battery cell assembly 120 to block both sides in the length direction of the cooling cavity 130.

[0111] In some embodiments, optionally, along the width direction of the battery cell assembly 120, the gap d1 between any two adjacent battery cells 121 satisfies 1 mm ≤ d1 ≤ 5 mm; and / or along the width direction of the battery cell assembly 120, the gap d2 between any adjacent battery cell 121 and end plate 190 satisfies 1 mm ≤ d2 ≤ 5 mm.

[0112] In this embodiment, it is defined that the gap between any two adjacent battery cells 121 is between 1 mm and 5 mm. Since the baffle 210 is disposed between any two adjacent battery cells 121, that is to say, the width of the baffle 210 is between 1 mm and 5 mm, which means the width of the formed cooling cavity 130 is between 1 mm and 5 mm. Thus, while ensuring that the coolant flows between any two adjacent battery cells 121 for efficient heat dissipation, it can be avoided that the overall volume of the battery pack 100 is too large due to the excessive distance between two adjacent battery cells 121.

[0113] The gap between any adjacent battery cell 121 and end plate 190 is between 1 mm and 5 mm. Since the baffle 210 is disposed between any adjacent battery cell 121 and end plate 190, that is to say, the width of the baffle 210 is between 1 mm and 5 mm, which means the width of the formed cooling cavity 130 is between 1 mm and 5 mm. Thus, while ensuring that the coolant flows between any two adjacent battery cells 121 for efficient heat dissipation, it can be avoided that the overall volume of the battery pack 100 is too large due to the excessive distance between two adjacent battery cells 121.

[0114] In a specific embodiment, such as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, there is a gap between the first monomer battery (cell 121) and the module end plate (end plate 190), and a certain distance of 1 mm to 5 mm is designed. After installing the first sealing part (baffle 210) and the second sealing part (baffle 210) in the gap, the upper and lower surfaces of the gap are respectively attached and sealed to the module top plate (the first plate body 170) and the module bottom plate (the second plate body 180), forming a cooling and sealing space (cooling chamber 130) with openings only at the coolant grooving positions. Starting from the second monomer battery (cell 121), the gaps between every two monomer batteries (cells 121) construct cooling and sealing spaces (cooling chambers 130) with the same structural dimensions. The cross-sectional schematic diagram of the liquid cooling chamber (cooling chamber 130) formed by the large surface (the first surface 122) of the battery (cell 121) is as Figure 2 shown.

[0115] As Figure 4 shown, the module top plate (the first plate body 170) is designed with a first liquid inlet (liquid inlet 114), which is connected to the liquid cooling pipeline of the battery pack or the system. After the coolant flows through the first liquid inlet and enters the liquid inlet groove 112, it enters each cell large surface liquid cooling cavity (cooling chamber 130) along the arrow direction. The liquid inlet groove sealing part (sealing part 150) seals the front and rear openings of the module top plate (the first plate body 170) to ensure the reliable sealing of the flow channel. At the same time, the other side of the module top plate at the second liquid inlet has the same flow channel structure as the first liquid inlet. Due to the design of the tabs on both the positive and negative sides of the blade battery, during normal charging and discharging operations, the temperature at both tabs (the first tab 141 and the second tab 142) will be higher than the temperature in the middle part of the cell 121. Therefore, it is designed that the coolant converges from both sides.

[0116] The module bottom plate (the second plate body 180) is designed with a liquid outlet groove 113 in the middle of the cell 121. After the coolant absorbs the heat of the cell 121, it flows out from here to the first liquid outlet (liquid outlet 115). The module bottom plate is closely attached to the bottom surface of the monomer battery (cell 121) through the bottom plate sealing part (the second sealing plate 162), and only has an opening (the second avoidance opening 164) corresponding to the liquid outlet groove 113.

[0117] This design separates the coolant from the cell conductive part (conductive part 140) and the explosion-proof valve and other structures, and the module can be integrated into the battery pack 100 or a single module for coolant circulation use.

[0118] In view of the high heat generation at the tabs on both sides of the blade battery (cell assembly 120), the coolant flows in from the liquid inlet grooves 112 on both sides and converges towards the middle liquid outlet groove 113. The flow length of the coolant flowing through each cell 121 is kept as similar as possible to ensure uniform coolant flow rate, and the thermal management effect of each cell 121 approaches consistency. A liquid cooling cavity (cooling cavity 130) for the coolant to flow through is provided between every two adjacent cells 121. The coolant flows into the liquid cooling cavity (cooling cavity 130) through the inlet (liquid inlet groove 112). After the coolant is in full contact with the large surface (first surface 122) of the cell 121 in the liquid cooling cavity (cooling cavity 130), the heat generated by the cell 121 is transferred to the coolant, and the coolant after absorbing the heat flows out through the outlet (liquid outlet groove 113). The coolant flows in the sealed cavity within the module, preventing the coolant from contacting the conductive part 140 of the cell 121 and thus affecting the normal operation of the cell 121, and greatly reducing the temperature gradient in the height direction of the cell 121.

[0119] According to the second aspect of the present utility model, a battery module is provided, which includes the battery pack 100 provided in any of the above embodiments, and thus has all the beneficial technical effects of the battery pack 100, which will not be elaborated herein.

[0120] Optionally, the battery module includes a plurality of battery packs 100. Among them, any one battery pack 100 includes a housing 110, a cell assembly 120, a cooling cavity 130, and a conductive part 140. Specifically, the cell assembly 120 is disposed in the accommodation cavity 111. The cell assembly 120 includes a plurality of cells 121. Optionally, the plurality of cells 121 are arranged along the width direction of the cell assembly 120.

[0121] A cooling cavity 130 is provided between any two adjacent cells 121. Alternatively, a cooling cavity 130 is provided between any one cell 121 and the inner wall of the housing 110. Alternatively, a cooling cavity 130 is provided between any two adjacent cells 121, and a cooling cavity 130 is provided between any one cell 121 and the inner wall of the housing 110. Specifically, it can be set according to actual needs. That is to say, the cooling cavity 130 for cooling the battery pack 100 is integrated in the housing 110.

[0122] It can be understood that the coolant circulates in the cooling cavity 130. That is to say, there is flowing coolant between any two adjacent battery cells 121, and / or between any battery cell 121 and the inner wall of the housing 110. That is, the coolant is in direct contact with the battery cells 121, so as to effectively dissipate heat from multiple battery cells 121 of the battery cell assembly 120, significantly reduce the temperature gradient in the height direction of the battery cells 121, as well as the temperature difference between multiple battery cells 121, improve the overall heat dissipation effect of the battery pack 100, meet the heat dissipation requirements of the large-capacity and high-density battery pack 100, reduce the risk of thermal runaway of the battery cells 121 caused by local overheating of the battery pack 100, and is beneficial to extending the service life of the battery pack 100.

[0123] Since the conductive part 140 is arranged outside the cooling cavity 130, it can ensure the heat dissipation effect of the battery cells 121 while preventing the conductive part 140 from being in direct contact with the coolant, avoiding damage to the conductive part 140 due to being contaminated by the coolant, improving the reliability of the battery pack 100, and further ensuring the normal operation of the battery pack 100.

[0124] In addition, since the coolant and the conductive part 140 are separated, it can also reduce the product processing requirements for the battery cells 121, the conductive part 140 and the coolant, which is beneficial to reducing the production cost of the battery pack 100.

[0125] According to the third aspect of the present invention, an energy storage integrated machine is provided, which includes the battery pack 100 or the battery module provided in any of the above embodiments, and thus has all the beneficial technical effects of the battery pack 100 or the battery module, which will not be elaborated here.

[0126] In the description of this specification, terms such as "connection", "installation", "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0127] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0128] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: include: A housing, wherein the housing is provided with a receiving cavity; A battery cell assembly is disposed in the accommodating cavity, and the battery cell assembly includes a plurality of battery cells; A cooling cavity is provided between any two adjacent battery cells, and / or the cooling cavity is provided between any battery cell and the inner wall of the housing; The conductive part is arranged outside the cooling cavity and is electrically connected to the battery core assembly.

2. The battery pack according to claim 1, characterized in that: Each of the battery cells comprises two opposite first surfaces and a plurality of second surfaces, the plurality of second surfaces are located between the two first surfaces and are respectively connected to the two first surfaces, and the area of ​​the first surface is greater than the area of ​​each of the second surfaces; Wherein, the cooling cavity is arranged between the first surfaces of any two adjacent battery cells, and / or the cooling cavity is located between the first surface of any battery cell and the inner wall of the shell.

3. The battery pack according to claim 1 or 2, characterized in that: The shell is provided with a liquid inlet groove and a liquid outlet groove, and the liquid inlet groove and the liquid outlet groove are respectively located on both sides of the height direction of the battery core assembly and are respectively communicated with the cooling cavity.

4. The battery pack according to claim 3, characterized in that: Along the length direction of the battery cell assembly, the battery cell assembly includes a first end and a second end opposite to each other, the conductive portion includes a first pole ear and a second pole ear, the first pole ear is arranged at the first end, and the second pole ear is arranged at the second end; Wherein, the liquid inlet groove is configured to be close to the first end, and / or the liquid inlet groove is configured to be close to the second end.

5. The battery pack according to claim 3, characterized in that: The liquid outlet groove is configured to be disposed near the middle of the battery core assembly.

6. The battery pack according to claim 3, characterized in that: The housing is further provided with a liquid inlet and a liquid outlet, wherein the liquid inlet is communicated with the liquid inlet tank, and the liquid outlet is communicated with the liquid outlet tank; Wherein, the liquid inlet and the liquid outlet are respectively located on the same side of the shell.

7. The battery pack according to claim 6, characterized in that: The liquid inlet groove comprises a first groove section and a second groove section, and along the length direction of the battery core assembly, the second groove section is located outside the first groove section; Among them, one end of the first slot section is communicated with the liquid inlet, the other end of the first slot section is communicated with the second slot section, and the second slot section is communicated with the cooling cavity.

8. The battery pack according to claim 7, characterized in that: One end of the second slot section is connected to the first slot section; The battery pack further comprises: The blocking portion is arranged at the other end of the second slot section and is used for blocking the second slot section.

9. The battery pack according to claim 3, characterized in that: Also includes: A sealing component is arranged in the accommodating cavity and located between the inner wall of the shell and the battery core component, and is used for sealing the cooling cavity.

10. The battery pack according to claim 9, characterized in that: The sealing assembly comprises: A first sealing plate and a second sealing plate, wherein along the height direction of the battery cell assembly, the first sealing plate and the second sealing plate are respectively located on both sides of the battery cell assembly; Wherein, the first sealing plate is provided with a first avoidance port, and the liquid inlet tank is communicated with the cooling cavity through the first avoidance port; the second sealing plate is provided with a second avoidance port, and the cooling cavity is communicated with the liquid outlet tank through the second avoidance port.

11. The battery pack according to claim 1 or 2, characterized in that: The housing comprises: A first plate body and a second plate body, along the height direction of the battery core assembly, the first plate body and the second plate body are respectively located on two sides of the battery core assembly; Two end plates, along the width direction of the battery core assembly, the two end plates are respectively located on both sides of the battery core assembly; A baffle is provided between any two adjacent battery cells, and / or the baffle is provided between any adjacent battery cells and the end plate, and along the height direction of the battery cell assembly, two ends of the baffle are respectively against the first plate body and the second plate body; Among them, based on the baffle being arranged between any two adjacent battery cells, the first plate body, the second plate body, any two adjacent battery cells and the baffle body enclose the cooling cavity; based on the baffle being arranged between any adjacent battery cells and the end plate, the first plate body, the second plate body, any adjacent battery cells and the end plate and the baffle body enclose the cooling cavity.

12. The battery pack according to claim 11, characterized in that: Along the width direction of the battery cell assembly, the gap d1 between any two adjacent battery cells satisfies 1mm≤d1≤5mm; and / or Along the width direction of the battery cell assembly, a gap d2 between any adjacent battery cells and the end plates satisfies 1 mm ≤ d2 ≤ 5 mm.

13. A battery module, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 12.

14. An integrated energy storage device, characterized in that: include: The battery pack according to any one of claims 1 to 12; or The battery module as claimed in claim 13.

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