A battery pack and energy storage system

Abstract

The application provides a battery pack and an energy storage system, relates to the technical field of energy sources, and aims to solve the problem of unreasonable heat dissipation structure of the current battery pack. The battery pack provided by the application comprises a heat exchange plate assembly and a battery cell assembly. The heat exchange plate assembly comprises a first liquid collecting pipe and a heat exchange plate. The heat exchange plate comprises a cooling liquid channel and a plurality of openings. At least one opening of the cooling liquid channel is arranged on one end face of the heat exchange plate. The first liquid collecting pipe is in communication with the at least one opening of the cooling liquid channel. The first liquid collecting pipe comprises at least one flow resistance adjusting device. Each flow resistance adjusting device comprises a chute and a resistance adjusting block. The chute is in communication with one opening of the cooling liquid channel. The resistance adjusting block is arranged in the chute and is used for moving along the chute. In the battery pack provided by the application, each heat exchange plate is equipped with a flow adjusting device which is independent of each other. The flow of each heat exchange plate can be effectively controlled according to actual use requirements, so that fine regulation and control can be realized.

Description

Technical Field

[0001] This application relates to the field of energy technology, and more particularly to a battery pack and energy storage system. Background Technology

[0002] With the continuous development and widespread application of clean energy, battery cells are increasingly being used in various types of energy storage systems. During the charging and discharging process, a certain amount of heat is generated, and this heat increases significantly with increasing charging or discharging power. Therefore, the heat dissipation performance of the battery cell has a significant impact on the charging and discharging power. As the industry's requirements for energy density and heat dissipation efficiency in energy storage systems continue to rise, current heat dissipation structures are no longer sufficient. For example, in current liquid cooling structures, the flow resistance design in the cooling pipes is often unreasonable, easily leading to poor localized heat dissipation. This results in large temperature differences on the surface of the battery cells and between different cells, which is detrimental to ensuring the reliability and lifespan of the battery cells. Summary of the Invention

[0003] This application provides a battery pack and energy storage system with better heat dissipation and better temperature uniformity.

[0004] In a first aspect, this application provides a battery pack, which may include a heat exchange plate assembly and a cell assembly. The heat exchange plate assembly includes a first liquid collector pipe and a heat exchange plate. The heat exchange plate includes a coolant channel and a plurality of openings. The heat exchange plate and the cell assembly are arranged adjacent to each other along a first direction. The coolant channel is disposed inside the heat exchange plate, and at least one opening of the coolant channel is disposed on one end face of the heat exchange plate. The first liquid collector pipe is connected to at least one opening of the coolant channel. The first liquid collector pipe includes at least one flow resistance adjusting device. Each flow resistance adjusting device includes a chute and a resistance adjusting block. The chute is connected to one opening of the coolant channel, and the resistance adjusting block is disposed within the chute and is used to move along the chute.

[0005] In the example provided in this application, the position of the regulating block within the chute can be adjusted to regulate the volume of the chute, thereby adjusting the resistance of the medium flowing through the chute. Each heat exchange plate is equipped with an independent flow regulating device, which can effectively control the flow rate of each heat exchange plate according to actual usage requirements, thus enabling fine-grained regulation.

[0006] In one example, the first collecting tube may include an upper end face and a lower end face, which are opposite to each other along a second direction perpendicular to the first direction. A groove extends through either the upper or lower end face along the second direction, and an adjusting block is used to move within the groove along the second direction. This improves ease of manufacturing and usability.

[0007] In one example, the flow resistance adjustment device may include a liquid collection port, which is an opening connecting the chute and the coolant passage. The length of the liquid collection port in a second direction is less than the length of the chute. By adjusting the sliding position of the adjustment block within the chute, the volume within the chute can be adjusted, thereby adjusting the flow resistance of the cooling medium as it flows through the chute.

[0008] In one example, the flow resistance adjustment device may include a through-hole extending through the slide groove in a first direction, the inner diameter of the through-hole being smaller than the inner diameter of the slide groove. By adjusting the sliding position of the adjustment block within the slide groove, the volume within the slide groove can be adjusted, thereby adjusting the flow resistance of the cooling medium as it flows through the slide groove.

[0009] In one example, the first liquid collection pipe may include two flow resistance adjustment devices arranged sequentially along a second direction, and one end face of the heat exchange plate includes two openings of the coolant passage. Specifically, one flow resistance adjustment device connects to one opening of the coolant passage, and the other connects to the other opening of the coolant passage. The flow resistance of the first liquid collection pipe can be effectively adjusted using the two flow resistance adjustment devices, improving ease of use.

[0010] In one example, the first collecting pipe includes a through groove and a plug. The through groove extends through the upper and lower end faces along a second direction, and the plug is fixedly disposed in the through groove. Specifically, the portion of the through groove between the plug and the upper end face forms a groove for a flow resistance adjustment device; the portion of the through groove between the plug and the lower end face forms a groove for another flow resistance adjustment device. The through groove has a through-type structure, which improves the convenience of manufacturing.

[0011] In one example, the first liquid collecting pipe may include a protrusion, the liquid collecting ports of two flow resistance adjusting devices are sequentially arranged on the protrusion along the second direction, one end face includes a recess, and two openings of the coolant channel are sequentially arranged on the recess along the second direction. The protrusion is used to be embedded in the recess to facilitate the connection stability and docking accuracy between the first liquid collecting pipe and the heat exchange plate.

[0012] In one example, the length of the protrusion along the second direction is greater than the sum of the lengths of the two liquid collection ports, the length of the recess along the second direction is greater than the sum of the lengths of the two openings, and the width of each liquid collection port along the first direction is less than the inner diameter of the chute or channel of each flow resistance regulating device.

[0013] In a specific configuration, the first liquid collection pipe may include four sides, which are adjacent to the upper end face and the lower end face respectively. Specifically, the first side face is opposite to the second side face and is positioned opposite to one end face of the heat exchange plate. The first side face is used to provide a protrusion. The third side face is opposite to the fourth side face along a first direction. At least one of the third side face or the fourth side face is used to provide a through hole to improve the convenience of use.

[0014] In one example, the heat exchange plate assembly includes multiple heat exchange plate assemblies arranged at intervals along a first direction, and at least one battery cell assembly is arranged between two adjacent heat exchange plate assemblies, which can effectively improve the efficiency of regulating the temperature of the battery cell assembly.

[0015] In one example, two adjacent heat exchanger plate assemblies may each include two flow resistance adjustment devices, and the two flow resistance adjustment devices of the two adjacent heat exchanger plate assemblies are connected through through holes.

[0016] In one example, a total liquid inlet is provided on the fourth side of the first liquid collecting pipe of one of the multiple heat exchange plate assemblies, and the total liquid inlet is connected to the slide groove of a flow resistance adjustment device in the first liquid collecting pipe; a total liquid outlet is provided on the fourth side of the first liquid collecting pipe of another of the multiple heat exchange plate assemblies, and the total liquid outlet is connected to the slide groove of a flow resistance adjustment device in the first liquid collecting pipe of the other heat exchange plate assembly, so as to improve the convenience of laying out the relevant pipelines.

[0017] In one example, one opening of the coolant passage can be an inlet, and the other opening can be an outlet. The function of the openings can be flexibly adjusted according to actual usage requirements.

[0018] In one example, the battery pack further includes a second manifold, and the heat exchange plate includes another end face that faces away from one end face. The coolant channels include a first coolant channel and a second coolant channel. The second manifold includes a cavity, a third manifold port, and a fourth manifold port. The cavity is connected to the first coolant channel via the third manifold port and to the second coolant channel via the fourth manifold port. The first coolant channel is connected to a flow resistance regulating device via an opening. The second coolant channel is connected to another flow resistance regulating device via another opening. Using a second manifold effectively improves the flexibility of coolant channel layout.

[0019] Secondly, this application also provides an energy storage system, which may include at least one of a power conversion device or a power generation device and the aforementioned battery pack. The power conversion device is used to: receive AC or DC power supplied by the power generation device or an external power source and output DC power to charge the battery pack; or receive power supplied by the battery pack and output AC or DC power. By applying the aforementioned battery pack, the heat dissipation performance and temperature uniformity of the energy storage system can be effectively improved, which is beneficial to ensuring the reliability and safety of the energy storage system. Attached Figure Description

[0020] Figure 1 A simplified schematic diagram of a conventional battery pack provided for this application;

[0021] Figure 2A three-dimensional structural diagram of a battery pack provided in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a heat exchanger assembly provided in an embodiment of this application;

[0023] Figure 4 A cross-sectional structural schematic diagram of a heat exchanger assembly provided in an embodiment of this application;

[0024] Figure 5 A three-dimensional structural schematic diagram of a first liquid collecting tube provided in an embodiment of this application;

[0025] Figure 6 A cross-sectional structural diagram of a first liquid collecting tube provided in an embodiment of this application;

[0026] Figure 7 A partial cross-sectional structural diagram of a first liquid collecting pipe and a heat exchange plate provided for an embodiment of this application;

[0027] Figure 8 This is a schematic diagram of the structure of a steering pipe provided in an embodiment of this application;

[0028] Figure 9 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0029] Figure 10 This is a schematic diagram of the planar structure of a battery pack provided in an embodiment of this application;

[0030] Figure 11 This is a schematic diagram of the structure of a heat exchange plate assembly in a battery pack, provided in an embodiment of this application.

[0031] Figure 12 This is a schematic diagram of the flow path of a battery pack provided in an embodiment of this application;

[0032] Figure 13 This is a schematic diagram of the structure of a heat exchange plate assembly in another battery pack provided in an embodiment of this application;

[0033] Figure 14 A schematic diagram of the flow path of another battery pack provided in an embodiment of this application;

[0034] Figure 15 An exploded view of another battery pack provided in an embodiment of this application;

[0035] Figure 16 This is a structural block diagram of an energy storage system provided in an embodiment of this application. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0037] To facilitate understanding of the battery pack provided in the embodiments of this application, its application scenarios will be introduced first below.

[0038] The battery pack provided in this application embodiment can be applied in scenarios such as home energy storage, industrial energy storage, data centers, and vehicles to store and release electrical energy.

[0039] In practical applications, to ensure that the battery pack can store sufficient electrical energy, it typically includes multiple battery cells. To reduce the size of the battery pack, the cells are arranged compactly. During the charging and discharging process, heat is generated. To prevent overheating, a heat dissipation structure can be incorporated into the battery pack.

[0040] Current heat dissipation structures are generally divided into two types: air cooling and liquid cooling. Air cooling primarily relies on airflow to remove heat from the battery cell surface. Liquid cooling, on the other hand, relies on the flow of a medium (such as water or oil) to remove heat from the battery cell surface. Because liquid cooling is more efficient and occupies less space, it is increasingly being adopted in the industry.

[0041] However, current liquid cooling systems still have many shortcomings in their heat dissipation structure.

[0042] For example, such as Figure 1 As shown, in a current liquid-cooled battery pack 01, there are generally multiple heat exchange plates 011 and battery cells 012. The outer surface of the battery cell 012 (the lower surface in the figure) is thermally bonded to the plate surface of the heat exchange plate 011 (the upper plate surface in the figure), allowing the heat exchange plate 011 to cool the battery cell 012. The multiple heat exchange plates 011 are connected sequentially through pipes 013. The medium enters the flow path through the inlet and exits through the outlet. During the flow, the medium passes through the multiple heat exchange plates 011 sequentially, thereby achieving heat exchange with the heat exchange plates 011 to cool the battery cell 012.

[0043] In the current method, the medium temperature is lowest at the inlet, resulting in high heat exchange efficiency with the heat exchange plate 011 near the inlet. As the medium flows, its temperature gradually increases, and the heat exchange efficiency between the medium and the heat exchange plate 011 near the outlet decreases. Ultimately, this results in a lower temperature for the cell 012 near the inlet and a higher temperature for the cell 012 near the outlet, leading to a large temperature difference between cells 012 at different locations. Consequently, there are issues with insufficient utilization of cooling capacity and poor temperature uniformity, which is detrimental to ensuring the operational reliability and lifespan of the battery pack 01.

[0044] Therefore, this application provides a battery pack with better heat dissipation and better temperature uniformity.

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” and “the” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” means one, two, or more.

[0047] References to "one embodiment" and similar terms used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. Therefore, phrases such as "in one embodiment," "in some embodiments," and "in other embodiments" appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized.

[0048] like Figures 2 to 4As shown, in one example provided in this application, the battery pack 10 may include a heat exchange plate assembly 11 and a cell assembly 12. The heat exchange plate assembly 11 includes a first liquid collecting pipe 111 and a heat exchange plate 112. The heat exchange plate 112 includes a coolant channel 1120 and a plurality of openings. The heat exchange plate 112 and the cell assembly 12 are arranged adjacent to each other along a first direction. The coolant channel 1120 is disposed inside the heat exchange plate 112. At least one opening of the coolant channel 1120 is disposed on one end face of the heat exchange plate 112. The first liquid collecting pipe 111 is connected to at least one opening of the coolant channel 1120. The first liquid collecting pipe 111 includes at least one flow resistance adjusting device. Each flow resistance adjusting device includes a slide groove 1111 and a resistance adjusting block (not shown in the figure). The slide groove 1111 is connected to one opening of the coolant channel 1120. The resistance adjusting block is disposed in the slide groove 1111 and is used to move along the slide groove 1111. The flow regulating device is used to regulate the flow rate of the medium flowing through the coolant channel 1120 inside the heat exchange plate 112. In practical applications, the position of the resistance adjusting block in the slide 1111 can be adjusted to regulate the volume of the slide 1111, thereby adjusting the resistance of the medium flowing through the slide 1111.

[0049] In the example provided in this application, each heat exchange plate 112 is equipped with an independent flow regulation device, which can effectively control the flow of each heat exchange plate 112 according to actual usage requirements, thereby enabling fine regulation.

[0050] like Figures 5 to 7 As shown, in one example provided in this application, the first liquid collecting pipe 111 includes an upper end face and a lower end face, which are opposite to each other along a second direction perpendicular to the first direction. In the example provided in this application, the heat exchange plate assembly 11 includes two flow resistance adjustment devices.

[0051] Specifically, the chute 1111 extends through the upper and lower ends of the first liquid collecting pipe 111 along the second direction. A plug 1113 is located in the middle of the chute 1111, dividing it into two independent chute sections 1111a and 1111b along the second direction. Two adjusting blocks are included: adjusting block 1112a and adjusting block 1112b. Adjusting block 1112a is located within chute 1111a and is used to move within chute 1111a along the second direction.

[0052] In the example provided in this application, the chute 1111 penetrates both the upper and lower ends of the first liquid collecting pipe 111, meaning the chute 1111 is a through-type structure, which facilitates processing, production, and use. After the chute 1111 is processed, the plug 1113 can be fixed inside the chute 1111, thereby dividing the chute 1111 into two parts: chute 1111a and chute 1111b.

[0053] Specifically, assuming the length of the chute 1111a is D, and the distance between the regulating block 1112a and the bottom wall of the chute 1111a is d, the flow resistance can be effectively controlled by adjusting the value of d / D. In the example provided in this application, when the regulating block 1112a slides into the chute 1111a, the volume of the chute 1111a is reduced, thereby increasing the flow resistance of the medium flowing through the chute 1111a. When the regulating block 1112a slides out of the chute 1111a, the volume of the chute 1111a is increased, thereby reducing the flow resistance of the medium flowing through the chute 1111a. That is, by adjusting the volume of the chute 1111a, the flow resistance can be changed, and ultimately the flow rate of the medium flowing through the heat exchange plate 112 can be effectively controlled.

[0054] Furthermore, in the example provided in this application, the regulating block 1112b is slidably disposed within the slide groove 1111b to adjust the volume of the slide groove 1111b. In the example provided in this application, when the regulating block 1112b slides into the slide groove 1111b, the volume of the slide groove 1111b is reduced, thereby increasing the flow resistance of the medium flowing through the slide groove 1111b. When the regulating block 1112b slides out of the slide groove 1111b, the volume of the slide groove 1111b is increased, thereby reducing the flow resistance of the medium flowing through the slide groove 1111b. That is, by adjusting the volume of the slide groove 1111b, the flow resistance can be changed, and ultimately the flow rate of the medium flowing through the heat exchange plate 112 can be effectively controlled.

[0055] In practical applications, the sliding position of the adjusting block 1112a can be adjusted individually. Alternatively, the sliding position of the adjusting block 1112b can be adjusted individually. Or, the sliding positions of both adjusting blocks 1112a and 1112b can be adjusted simultaneously.

[0056] In other examples, the chute 1111 may extend only to one of the upper or lower end faces of the first liquid collecting pipe 111. When the chute 1111 extends only to one of the upper or lower end faces of the first liquid collecting pipe 111, only one adjusting block can be provided. In addition, the plug 1113 can be omitted, which will not be described in detail here.

[0057] In addition, such as Figures 5 to 7As shown, in one example provided in this application, the flow resistance regulating device includes a liquid collection port 1114 and a liquid collection port 1115. The liquid collection port 1114 is used to connect an opening in the slide 1111a with a coolant channel 1120 within the heat exchange plate 112. The length of the liquid collection port 1114 along the second direction is less than the length of the slide 1111a. When the regulating block 1112a slides along the second direction within the slide 1111a, the flow resistance of the slide 1111a can be effectively adjusted, thereby regulating the flow rate of the medium flowing through the liquid collection port 1114. Correspondingly, the liquid collection port 1115 is used to connect an opening in the slide 1111b with a coolant channel within the heat exchange plate 112. The length of the liquid collection port 1115 along the second direction is less than the length of the slide 1111b. When the regulating block 1112b slides in the chute 1111b along the second direction, the flow resistance of the chute 1111b can be effectively adjusted, thereby adjusting the flow rate of the medium flowing through the liquid collection port 1115.

[0058] Additionally, the flow resistance adjustment device includes a through hole 1116 and a through hole 1117. The through hole 1116 extends through the slide groove 1111a along a first direction, and the inner diameter of the through hole 1116 is smaller than the inner diameter of the slide groove 1111a. Cooling medium can flow into the slide groove 1111a through the through hole 1116 and out through the collection port 1114. By adjusting the sliding position of the adjusting block 1112a within the slide groove 1111a, the volume within the slide groove 1111a can be adjusted, thereby adjusting the flow resistance of the cooling medium as it flows through the slide groove 1111a. Correspondingly, the through hole 1117 extends through the slide groove 1111b along the first direction, and the inner diameter of the through hole 1117 is smaller than the inner diameter of the slide groove 1111b. Cooling medium can flow into the slide groove 1111b through the through hole 1117 and out through the collection port 1115. By adjusting the sliding position of the adjusting block 1112b within the slide groove 1111b, the volume within the slide groove 1111b can be adjusted, thereby adjusting the flow resistance of the cooling medium as it flows through the slide groove 1111b.

[0059] like Figures 5 to 7 As shown, the first liquid collecting pipe 111 includes a protrusion 1118, and liquid collecting ports 1114 and 1115 are arranged along a second direction on the protrusion 1118. The first end face of the heat exchange plate 112 includes a recess 1121, and openings 1122 and 1123 of the coolant channel 1120 are sequentially arranged along the second direction on the recess 1121. The protrusion 1118 is used to embed into the recess 1121, realizing communication between the liquid collecting port 1114 and the opening 1122, and also realizing communication between the liquid collecting port 1115 and the opening 1123. The sequential arrangement of the liquid collecting ports 1114 and 1115 along the second direction helps to increase the heat dissipation area of ​​the heat dissipation channel outlet.

[0060] In a specific configuration, the length of the protrusion 1118 along the second direction is greater than the sum of the lengths of the liquid collecting port 1114 and the liquid collecting port 1115. The length of the recess 1121 along the second direction is greater than the sum of the lengths of the opening 1122 and the opening 1123. Additionally, along the first direction (perpendicular to...) Figure 7 The width of each liquid collecting port 1114 and 1115 is smaller than the inner diameter of the slide groove 1111a or 1111b of each flow resistance adjusting device. When the adjusting block 1112a slides along the second direction, it can effectively adjust the flow resistance of the cooling medium as it flows through the liquid collecting port 1114 and the opening 1122. When the adjusting block 1112b slides along the second direction, it can effectively adjust the flow resistance of the cooling medium as it flows through the liquid collecting port 1115 and the opening 1123.

[0061] like Figure 5 As shown in the example provided in this application, the first liquid collecting pipe 111 is generally a rectangular cylindrical structure. The first liquid collecting pipe 111 includes four sides, namely a first side 11101, a second side 11102, a third side 11103, and a fourth side 11104. The four sides are adjacent to the upper end face and the lower end face, respectively. The first side 11101 is opposite to the second side 11102, and the first side 11101 is opposite to one end face of the heat exchange plate 112. The first side 11101 is used to provide a protrusion 1118. The third side 11103 and the fourth side 11104 are opposite to each other along a first direction. At least one of the third side 11103 or the fourth side 11104 is used to provide through holes 1116 and 1117.

[0062] like Figure 2 As shown, in one example provided in this application, the battery pack 10 may include two heat exchange plate assemblies 11 and one cell assembly 12. The first liquid collection pipes 111 in both heat exchange plate assemblies 11 are connected via pipes 114, forming a parallel relationship between each heat exchange plate assembly 11, thereby avoiding mutual interference between different heat exchange plate assemblies 11. Furthermore, the heat exchange plate assemblies 11 and the cell assembly 12 are alternately arranged sequentially along a first direction, and the cell assembly 12 is thermally bonded to both heat exchange plates 112 to facilitate heat exchange between the heat exchange plates 112 and the cell assembly 12. The first direction refers to the thickness direction of the heat exchange plate 112.

[0063] In the example provided in this application, the cell assembly 12 can be cooled by the heat exchange plate assembly 11, and the heat exchange plate assemblies 11 are arranged in parallel to avoid the medium flowing sequentially between different heat exchange plates 112, so that the temperature of the medium flowing through each heat exchange plate 112 is basically the same, thereby effectively reducing the temperature difference of the cell 121, which is beneficial to ensuring the temperature uniformity of the entire battery pack 10, and also beneficial to improving the utilization effect of the medium's cooling capacity.

[0064] In specific configurations, the structure of the heat exchange plate assembly 11 can be varied.

[0065] like Figure 3 As shown, in one example provided in this application, the heat exchange plate 112 is a rectangular plate structure.

[0066] like Figure 4 As shown, the heat exchange plate 112 has a coolant channel 1120 inside for the flow of the medium. The coolant channel 1120 includes two straight flow channels, namely a first coolant flow channel 1120a and a second coolant flow channel 1120b, and one end of each coolant flow channel is located on the first side of the heat exchange plate 112 (e.g., ...). Figure 4 The left side of the heat exchange plate 112 is located on the other side (e.g., the left side of the heat exchange plate 112). Figure 4 (The right side of the middle). It should be noted that, in Figure 4 The example shown schematically illustrates two coolant flow channels. In practical applications, the number of coolant flow channels can be one, two, or more, and this application does not impose any limitation on this.

[0067] In addition, such as Figure 4 and Figure 8 As shown in the example provided in this application, the heat exchanger plate assembly 11 further includes a second liquid collecting pipe 113, which can be connected to the flow channels in the heat exchanger plate 112 to facilitate the connection between the flow channels. Specifically, the second liquid collecting pipe 113 is a tubular structure closed at both ends. The sidewall of the second liquid collecting pipe 113 has two elongated liquid collecting ports, namely liquid collecting port 1131 and liquid collecting port 1132. The openings of the two flow channels in the heat exchanger plate 112 on the second side are opening 1124 and opening 1125, respectively. The second liquid collecting pipe 113 is disposed on the second side of the heat exchanger plate 112, and liquid collecting port 1131 can be connected to opening 1124; liquid collecting port 1132 can be connected to opening 1125. The second liquid collecting pipe 113 enables communication between the two flow channels. In practical applications, the opening 1122 of the coolant passage 1120 on the first side of the heat exchange plate 112 can serve as the inlet, and the opening 1123 of the coolant passage 1120 on the first side of the heat exchange plate 112 can serve as the outlet. That is, the cooling medium can enter the coolant passage 1120 through the opening 1122, and the cooling medium can flow out through the opening 1123. In other words, the inlet and outlet of the heat exchange plate 112 can both be located on the same side (i.e., the first side) of the heat exchange plate 112, facilitating the layout of other related pipelines.

[0068] Alternatively, it can be understood that in the example provided in this application, the flow channels in the heat exchange plate 112 are straight, resulting in a relatively simple structure. This effectively reduces manufacturing costs and achieves a high yield rate. Furthermore, by providing a second liquid collection pipe 113 on the side of the heat exchange plate 112, communication between different flow channels can be achieved. Simultaneously, the flow direction of the medium can be changed, allowing the inlet and outlet ends of the heat exchange plate 112 to be located on the same side (such as the first side), facilitating the laying of external pipelines.

[0069] It is understandable that, in practical applications, the second liquid collection tube 113 may also have other structural forms.

[0070] For example, the second liquid collection pipe 113 may include multiple independent connecting pipes, and the two ends of the connecting pipes may be connected to the corresponding flow channels respectively.

[0071] Alternatively, in other examples, the coolant passage 1120 in the heat exchange plate 112 can also be U-shaped, that is, both ends of the coolant passage 1120 can be located on the same side of the heat exchange plate 112, thereby omitting the setting of the second liquid collection pipe 113.

[0072] It is understandable that in practical applications, the structural types of heat exchange plate 112 and second liquid collection pipe 113 can be reasonably selected and adjusted according to actual needs, which will not be elaborated here.

[0073] In addition, the structure of the first liquid collection tube 111 can be varied in specific applications.

[0074] In specific applications, the type and number of cells 121 included in the cell assembly 12 can be varied.

[0075] For example, cell 121 can be a lithium-ion battery, a sodium-ion battery, or other types. This application does not limit the specific type of cell 121.

[0076] In addition, such as Figure 9 As shown, in one example provided in this application, the battery cell 121 has a rectangular block structure with a top surface 121a, a bottom surface 121b, a side surface 121c, a side surface 121d, a side surface 121e, and a side surface 121f. Among them, the side surfaces 121c and 121d have smaller areas, while the side surfaces 121e and 121f have larger areas.

[0077] like Figure 2 and Figure 9As shown in the example provided in this application, the larger side surfaces (such as side surface 121e or side surface 121f) of two adjacent cells 121 are in contact with each other, resulting in a larger contact area between the two adjacent cells 121. When there is a compressive force between two adjacent cells 121, it can effectively prevent the two adjacent cells 121 from deforming, which is beneficial to ensuring the structural strength and safety of the cell assembly 12.

[0078] In addition, the two smaller sides of the battery cell 121 (such as side 121c or side 121d) are thermally bonded to the adjacent heat exchange plate 112, which effectively reduces the temperature difference between different areas of the battery cell 121 and helps to ensure the temperature uniformity of the battery cell 121 itself. In some examples, thermal pads or other structures can also be provided between the contact surfaces of the battery cell 121 and the heat exchange plate 112 to improve the thermal conductivity between the battery cell 121 and the heat exchange plate assembly 11.

[0079] In the example provided above, the exemplary illustration is provided with a battery pack 10 including a cell assembly 12 and two heat exchange plate assemblies 11.

[0080] In addition, such as Figure 10 As shown in the example provided in this application, there are four battery cell assemblies: 12a, 12b, 12c, and 12d. There are five heat exchanger assemblies: 11a, 11b, 11c, 11d, and 11e. That is, the number of heat exchanger assemblies is one more than the number of battery cell assemblies. In a specific configuration, the heat exchanger assemblies and battery cell assemblies are alternately arranged along the thickness direction of the heat exchanger plates, ensuring that both sides of each battery cell assembly are thermally bonded to different heat exchanger plates, thus improving the cooling effect of the battery cell assembly. Furthermore, adjacent battery cell assemblies can be effectively isolated by the heat exchanger plates, preventing mutual interference between adjacent battery cell assemblies and improving the safety and cooling performance of the entire battery pack 10.

[0081] Of course, in specific configurations, the number of battery cell assemblies can be two, three, or more. The number of heat exchanger assemblies can be three, four, or more. In general, in specific configurations, when the number of heat exchanger assemblies is N, the number of battery cell assemblies is N-1, where N is an integer greater than or equal to 3.

[0082] In addition, in practical applications, the flow rate of the medium flowing through each heat exchange plate can be the same or different.

[0083] It should be noted that in practical applications, flow resistance exists in both pipes and heat exchangers, and in pipes, the flow resistance is directly proportional to the pipe length. Therefore, to facilitate the explanation of the flow rate through different heat exchangers, the flow resistance of the flow path for each heat exchanger will be explained in detail below.

[0084] like Figure 11 and Figure 12 As shown, the main liquid inlet 101 of the battery pack 10 is located in the first liquid collecting pipe 111a, and the main liquid outlet 102 is located in the first liquid collecting pipe 111e. The liquid inlets of the five first liquid collecting pipes are connected sequentially through pipe 114, and the liquid outlets of the five first liquid collecting pipes are connected sequentially through pipe 115. The structures of the five heat exchange plates are basically the same; therefore, the thermal resistance R of each heat exchange plate is... 板 They are basically the same. Additionally, in Figure 11 The eight pipes 114 and 115 in the design are basically the same size; therefore, the thermal resistance R of each pipe is... 管 They are basically the same.

[0085] The medium flow path of flow path 1, where heat exchange plate 112a is located, is as follows: heat exchange plate 112a, pipeline, pipeline, pipeline and pipeline.

[0086] The medium flow path of flow path 2, where heat exchange plate 112b is located, is as follows: pipeline, heat exchange plate 112b, pipeline, pipeline, and pipeline.

[0087] The medium flow path of flow path 3 where heat exchange plate 112c is located is as follows: pipeline, pipeline, heat exchange plate 112c, pipeline and pipeline.

[0088] The medium flow path of flow path 4, where heat exchange plate 112d is located, is as follows: pipe, pipe, pipe, heat exchange plate 112d and pipe.

[0089] The medium flow path of flow path 5, where heat exchange plate 112e is located, is as follows: pipe, pipe, pipe, pipe and heat exchange plate 112e.

[0090] The flow resistance of each flow path is R. 管 4+R 板 Therefore, in Figure 11 In the example provided, the flow resistance of the five flow paths is basically the same.

[0091] Assume the flow rate of the medium flowing through heat exchange plate 112a is M. 板1 The flow rate of the medium flowing through heat exchange plate 112b is M. 板2 The flow rate of the medium flowing through heat exchange plate 112c is M. 板3 The flow rate of the medium flowing through heat exchange plate 112d is M. 板4 The flow rate of the medium flowing through heat exchange plate 112e is M.板5 .

[0092] Assuming the flow resistance is the same in each of the first liquid collecting pipes, the relationship between the flow rates obtained by different heat exchange plates can be determined based on the flow resistance in the different flow paths described above: M 板3 = M 板2 = M 板4= M 板1 = M 板5 .

[0093] Assume that the current obtained by cell assembly 12a is M. 电1 The current obtained by cell assembly 12b is M 电2 The current obtained by cell assembly 12c is M 电3 The current obtained by the battery cell assembly in 12d is M 电4 .

[0094] Because the cell assembly 12a is thermally bonded to the heat exchange plates 112a and 112b, the flow rate M obtained by the cell assembly 12a is... 电1 = M 板1 + M 板2 / 2.

[0095] Because the battery cell assembly 12b is thermally bonded to the heat exchange plates 112b and 112c, the flow rate M obtained by the battery cell assembly 12b is... 电2 = (M) 板2 + M 板3 ) / 2.

[0096] Because the battery cell assembly 12c is thermally bonded to the heat exchange plates 112c and 112d, the flow rate M obtained by the battery cell assembly 12c is... 电3 = (M) 板3 + M 板4 ) / 2.

[0097] Because the battery cell assembly 12d is thermally bonded to the heat exchange plates 112d and 112e, the flow rate M obtained by the battery cell assembly 12d is... 电4 = M 板5 + M 板4 / 2.

[0098] In practical applications, the flow rate obtained by each cell assembly can be adjusted to be basically the same by adjusting the flow resistance of different first liquid collection tubes, thereby ensuring the temperature uniformity between different cell assemblies.

[0099] Of course, in practical applications, the flow resistance in different flow paths can also be different.

[0100] For example, heat exchange plates 112a and 112e each dissipate heat for one battery cell assembly, therefore, the cooling capacity required for heat exchange plates 112a and 112e is relatively low. Heat exchange plates 112b, 112c, and 112d dissipate heat for two adjacent battery cell assemblies, therefore, the cooling capacity required for heat exchange plates 112b, 112c, and 112d is relatively high. In practical applications, the flow resistance of the first liquid collectors 111a and 111e can be adjusted to a larger value, while the flow resistance of the first liquid collectors 111b, 111c, and 111d can be adjusted to a smaller value, in order to achieve rational utilization of cooling capacity, improve the overall heat dissipation effect of the battery pack 10, and reduce the temperature difference between different battery cell assemblies.

[0101] In addition, in the example above, the main liquid inlet 101 of the battery pack 10 is located in the first liquid collection pipe 111a, and the main liquid outlet 102 is located in the first liquid collection pipe 111e. That is, the main liquid inlet 101 and the main liquid outlet 102 of the battery pack 10 are respectively located in the first liquid collection pipe at the edge, which facilitates docking with external pipelines during deployment.

[0102] Of course, in other examples, the main liquid inlet 101 and main liquid outlet 102 of the battery pack 10 may also be located in other first liquid collection pipes.

[0103] For example, such as Figure 13 and Figure 14 As shown, in another example provided in this application, the main liquid inlet 101 and the main liquid outlet 102 of the battery pack 10 are both located in the first liquid collection pipe 111c.

[0104] Specifically, the medium flow path of flow path 1 where heat exchange plate 112a is located is as follows: pipe, pipe, heat exchange plate 112a, pipe and pipe.

[0105] The medium flow path of flow path 2, where heat exchange plate 112b is located, is as follows: pipeline, heat exchange plate 112b and pipeline.

[0106] The medium flow path of flow path 3 where heat exchange plate 112c is located is: heat exchange plate 112c.

[0107] The medium flow path of flow path 4, where heat exchange plate 112d is located, is as follows: pipeline, heat exchange plate 112d and pipeline.

[0108] The medium flow path of flow path 5, where heat exchange plate 112e is located, is as follows: pipe, pipe, heat exchange plate 112e, pipe and pipe.

[0109] Among them, the flow resistance R of flow path 1 流1 For: R 板 +R 管 4.

[0110] Flow resistance R of flow path 2 流2 R board + R 管 2.

[0111] Flow resistance R of flow path 3 流3 For R-plate.

[0112] Flow resistance R of flow path 4 流4 R board + R 管 2.

[0113] Flow resistance R of flow path 5 流5 R board + R 管 4.

[0114] The comparison clearly shows that: R 流3 < R 流2 = R 流4 < R 流1 = R 流5 .

[0115] Assume the flow rate of the medium flowing through heat exchange plate 112a is M. 板1 The flow rate of the medium flowing through heat exchange plate 112b is M. 板2 The flow rate of the medium flowing through heat exchange plate 112c is M. 板3 The flow rate of the medium flowing through heat exchange plate 112d is M. 板4 The flow rate of the medium flowing through heat exchange plate 112e is M. 板5 .

[0116] Assuming the flow resistance is the same in each of the first liquid collecting pipes, the relationship between the flow rates obtained by different heat exchange plates can be determined based on the flow resistance in the different flow paths described above: M 板3 > M 板2 = M 板4 > M 板1 = M 板5 .

[0117] Assume that the current obtained by cell assembly 12a is M. 电1 The current obtained by cell assembly 12b is M 电2 The current obtained by cell assembly 12c is M 电3 The current obtained by the battery cell assembly in 12d is M 电4 .

[0118] Because the cell assembly 12a is thermally bonded to the heat exchange plates 112a and 112b, the flow rate M obtained by the cell assembly 12a is... 电1 = M 板1 + M板2 / 2.

[0119] Because the battery cell assembly 12b is thermally bonded to the heat exchange plates 112b and 112c, the flow rate M obtained by the battery cell assembly 12b is... 电2 = (M) 板2 + M 板3 ) / 2.

[0120] Because the battery cell assembly 12c is thermally bonded to the heat exchange plates 112c and 112d, the flow rate M obtained by the battery cell assembly 12c is... 电3 = (M) 板3 + M 板4 ) / 2.

[0121] Because the battery cell assembly 12d is thermally bonded to the heat exchange plates 112d and 112e, the flow rate M obtained by the battery cell assembly 12d is... 电4 = M 板5 + M 板4 / 2.

[0122] In practical applications, since cell assemblies 12b and 12c are located in the middle of the battery pack 10, slight thermal expansion may occur if their temperatures are high, potentially reducing the safety of the battery pack 10. In the example provided in this application, by placing the main liquid inlet 101 and the main liquid outlet 102 in the first liquid collection pipe located in the middle, the flow resistance of the flow paths (such as flow paths 2 and 3) where the heat exchange plate is located in the middle can be effectively reduced, thus effectively improving the safety of the battery pack 10.

[0123] It is understood that the above example is an illustrative illustration using the example of battery pack 10 comprising five heat exchanger assemblies. In other examples, the number of heat exchanger assemblies may be three, five, or more.

[0124] In summary, the battery pack 10 may include N heat exchange plate assemblies. Along a first direction, the N heat exchange plate assemblies are arranged sequentially, and the N first liquid collection pipes are connected sequentially via pipelines. The total liquid inlet 101 and the total liquid outlet 102 of the heat exchange plate assemblies are both located in the (N+1) / 2th first liquid collection pipe, where N is an odd number greater than or equal to 3.

[0125] Of course, the number of heat exchanger assemblies in the battery pack 10 can also be four, six or more.

[0126] In summary, the battery pack 10 may include N heat exchanger plate assemblies. Along a first direction, the N heat exchanger plate assemblies are arranged sequentially, and the N first liquid collection pipes are connected sequentially via pipelines. The total liquid inlet 101 and the total liquid outlet 102 of the heat exchanger plate assembly are both located in the N / 2th first liquid collection pipe. Alternatively, the total liquid inlet 101 and the total liquid outlet 102 may both be located in the N / 2+1th first liquid collection pipe. Here, N is an even number greater than or equal to 4.

[0127] In practical applications, the number of heat exchanger assemblies and battery cell assemblies can be flexibly selected and adjusted according to actual needs, which will not be elaborated here.

[0128] In addition, such as Figure 15 As shown, in one example provided in this application, the battery pack 10 also includes a housing 14, and the heat exchange plate assembly 11 and the cell assembly 12 are both disposed inside the housing 14, so that the housing 14 can effectively protect the cell assembly 12 and the heat dissipation plate assembly 11.

[0129] Specifically, in the example provided in this application, the outer casing 14 includes a base plate 143, an upper cover 141, and a top cover 142. In a specific configuration, the base plate 143, the upper cover 141, and the top cover 142 can be fixedly connected by screws, or they can be connected by welding, bonding, or other methods. This application does not impose any restrictions on this.

[0130] In addition, in practical applications, the battery pack 10 can be used in scenarios such as home energy storage, industrial energy storage, data centers, and vehicles to store and release electrical energy.

[0131] For example, such as Figure 16 As shown, this application embodiment also provides an energy storage system, which may include at least one of a power conversion device or a power generation device and the aforementioned battery pack. The power conversion device is used to receive AC or DC power provided by the power generation device or an external power source and output DC power to charge the battery pack; or, receiving power from the battery pack and outputting AC or DC power includes an inverter and a battery pack.

[0132] The power conversion device may include an AC-DC converter and a DC-DC converter. The power grid is connected to the battery pack through the AC-DC converter, which converts the AC power from the power grid into DC power to supply the battery pack for energy storage.

[0133] The battery pack can be connected to the powered device (such as a vehicle) via a DC-DC converter. The DC-DC converter can boost or buck the DC voltage and supply it to the powered device to meet the actual charging power requirements of the powered device.

[0134] In another possible implementation, a power generation device may be included, which can be connected to the battery pack via a DC-DC converter. The DC-DC converter can boost or buck the voltage of the DC power generated by the power generation device before supplying it to the battery pack. The power generation device can be a photovoltaic power generation device, a wind power generation device, etc., and this application does not limit the specific type of power generation device.

[0135] The power grid and power generation equipment can coexist, or it can consist of only power generation equipment.

[0136] In addition, the energy storage system may also include a battery management system. The battery management system can effectively detect parameters such as the temperature, state of charge, and health status of the battery pack, and can also effectively regulate the charging and discharging functions of the battery pack, thereby ensuring the normal operation of the energy storage device.

[0137] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, The device includes a heat exchange plate assembly and a battery cell assembly. The heat exchange plate assembly includes a first liquid collecting pipe and a heat exchange plate. The heat exchange plate includes a coolant channel and multiple openings. The heat exchange plate and the battery cell assembly are arranged adjacent to each other along a first direction. The coolant channel is disposed inside the heat exchange plate, and at least one opening of the coolant channel is disposed on one end face of the heat exchange plate. The first liquid collecting pipe is connected to at least one opening of the coolant channel. The first liquid collection pipe includes at least one flow resistance adjustment device, each of the flow resistance adjustment devices including a chute and a resistance adjustment block, the chute being connected to one of the openings of the coolant channel, and the resistance adjustment block being disposed in the chute and used to move along the chute.

2. The battery pack according to claim 1, characterized in that, The first collection tube includes an upper end face and a lower end face, and the upper end face and the lower end face are opposite to each other along a second direction perpendicular to the first direction, wherein: The slide groove extends through one of the upper or lower end faces along the second direction, and the adjusting block is used to move within the slide groove along the second direction.

3. The battery pack according to any one of claims 1-2, characterized in that, The flow resistance adjustment device includes a liquid collection port, which is used to connect the chute and one of the openings of the coolant channel. The length of the liquid collection port along the second direction is less than the length of the chute.

4. The battery pack according to any one of claims 1-2, characterized in that, The flow resistance adjustment device includes a through hole that extends through the slide groove in a first direction, wherein the inner diameter of the through hole is smaller than the inner diameter of the slide groove in the first direction.

5. The battery pack according to any one of claims 1-2, characterized in that, The first liquid collecting pipe includes two flow resistance adjusting devices, which are arranged sequentially along the second direction. One end face of the heat exchange plate includes two openings of the coolant channel, wherein: One of the flow resistance regulating devices is used to connect one of the openings of the coolant passage; Another flow resistance regulating device is used to connect to another opening of the coolant passage.

6. The battery pack according to claim 5, characterized in that, The first collection tube includes a through groove and a plug. The through groove extends through the upper end face and the lower end face along the second direction. The plug is fixedly disposed in the through groove, wherein: The portion between the plug and the upper end face in the through groove constitutes the slide groove of the flow resistance adjustment device. The portion of the channel between the plug and the lower end face constitutes the chute of the other flow resistance adjustment device.

7. The battery pack according to claim 6, characterized in that, The first liquid collecting pipe includes a protrusion, and the liquid collecting ports of the two flow resistance adjusting devices are sequentially arranged on the protrusion along the second direction. One end face includes a recess, and the two openings of the coolant channel are sequentially arranged on the recess along the second direction. The protrusion is used to be embedded in the recess.

8. The battery pack according to claim 7, characterized in that, The length of the protrusion along the second direction is greater than the sum of the lengths of the two liquid collection ports, the length of the recess along the second direction is greater than the sum of the lengths of the two openings, and the width of each liquid collection port along the first direction is less than the inner diameter of the chute or the through groove of each flow resistance adjustment device.

9. The battery pack according to claim 7, characterized in that, The first collection tube includes four sides, which are respectively adjacent to the upper end face and the lower end face, wherein: The first side is opposite to the second side, and the first side is disposed opposite to one end face of the heat exchange plate. The first side is used to provide the protrusion. The third side and the fourth side are arranged opposite each other along the first direction, and at least one of the third side or the fourth side is used to provide a through hole.

10. The battery pack according to claim 9, characterized in that, The heat exchange plate assembly includes a plurality of heat exchange plate assemblies, which are arranged at intervals along a first direction, and at least one of the battery cell assemblies is arranged between two adjacent heat exchange plate assemblies.

11. The battery pack according to claim 10, characterized in that, Each of two adjacent heat exchanger plate assemblies includes two flow resistance adjustment devices, and the two flow resistance adjustment devices of the two adjacent heat exchanger plate assemblies are connected through the through hole.

12. The battery pack according to claim 10, characterized in that, A total liquid inlet is provided on the fourth side of the first liquid collecting pipe of one of the plurality of heat exchange plate assemblies, and the total liquid inlet is connected to the slide groove of one of the flow resistance adjusting devices in the first liquid collecting pipe. The fourth side of the first liquid collecting pipe of another of the plurality of heat exchange plate assemblies is provided with a total liquid outlet, which is connected to the slide groove of a flow resistance adjusting device in the first liquid collecting pipe of the other heat exchange plate assembly.

13. The battery pack according to any one of claims 1-2, characterized in that, One of the openings of the coolant channel is an inlet, and the other opening of the coolant channel is an outlet.

14. The battery pack according to any one of claims 1-2, characterized in that, The battery pack further includes a second liquid collection pipe, the heat exchange plate includes another end face that is opposite to the first end face, and the coolant channel includes a first coolant channel and a second coolant channel, wherein: The second liquid collection pipe includes a cavity, a third liquid collection port, and a fourth liquid collection port. The cavity is connected to the first coolant channel through the third liquid collection port and is connected to the second coolant channel through the fourth liquid collection port. The first coolant passage is connected to one of the flow resistance regulating devices through one of the openings; The second coolant passage is connected to another flow resistance regulating device through another of the openings.

15. An energy storage system, characterized in that, Includes at least one of a power conversion device or a power generation device and a battery pack as claimed in any one of claims 1 to 14, wherein the power conversion device is used for: Receives AC or DC power from the power generation equipment or an external power source and outputs DC power to charge the battery pack; or, It receives power from the battery pack and outputs AC or DC power.

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