CN116315267A

CN116315267A - Battery pack and energy storage system

Info

Publication number: CN116315267A
Application number: CN202310230111.0A
Authority: CN
Inventors: 张创; 邹恒龙; 施家飞; 周书强; 曾智
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-06-23
Also published as: WO2024178992A1; WO2024178992A9

Abstract

The application provides a battery pack and an energy storage system, relates to the technical field of energy, and aims to solve the problem that a heat dissipation structure of a current battery pack is unreasonable. The battery pack 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, and the first liquid collecting pipe is communicated with at least one opening of the cooling liquid channel; wherein: the first liquid collecting pipe comprises at least one flow resistance adjusting device, each flow resistance adjusting device comprises a sliding groove and a resistance adjusting block, the sliding groove is communicated with one opening of the cooling liquid channel, and the resistance adjusting blocks are arranged in the sliding groove and used for moving along the sliding groove. In the battery pack provided by the application, each heat exchange plate is provided with a mutually independent flow regulating device, so that the flow of each heat exchange plate can be effectively controlled according to actual use requirements, and further fine regulation and control can be realized.

Description

Battery pack and energy storage system

Technical Field

The application relates to the technical field of energy sources, in particular to a battery pack and an energy storage system.

Background

With the continuous development and wide application of clean energy, the battery cells are beginning to be widely applied to various energy storage systems. In the charging and discharging process of the battery cell, certain heat can be generated, and the heat generated by the battery cell can be obviously increased along with the continuous increase of the charging power or the discharging power, so that the heat dissipation performance of the battery cell has obvious influence on the charging and discharging power. With the continuous improvement of the energy density and heat dissipation efficiency requirements of energy storage systems in industry, the current heat dissipation structure cannot meet the requirements. For example, in the current liquid cooling heat dissipation structure, the flow resistance design in the cooling pipeline is unreasonable, and the problem of poor local heat dissipation effect is easy to occur. Therefore, the temperature difference on the surface of the battery core is larger, and the temperature difference between different battery cores is larger, so that the working reliability and the service life of the battery core are not guaranteed.

Disclosure of Invention

The application provides a radiating effect is better, and temperature uniformity is better battery package and energy storage system.

In a first aspect, the present application provides a battery pack that may include a heat exchange plate assembly and a 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, the heat exchange plate and the battery cell assembly are adjacently arranged along the first direction, the cooling liquid channel is arranged in the heat exchange plate, at least one opening of the cooling liquid channel is arranged on one end face of the heat exchange plate, and the first liquid collecting pipe is communicated with at least one opening of the cooling liquid channel. Wherein: the first liquid collecting pipe comprises at least one flow resistance adjusting device, each flow resistance adjusting device comprises a sliding groove and a resistance adjusting block, the sliding groove is communicated with one opening of the cooling liquid channel, and the resistance adjusting blocks are arranged in the sliding groove and used for moving along the sliding groove.

In the examples provided herein, the position of the resistance adjustment block within the chute may be adjusted to adjust the volume of the chute, thereby adjusting the resistance of the medium as it flows through the chute. Each heat exchange plate is provided with a flow regulating device which is mutually independent, and 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.

In one example, the first header may include an upper end face and a lower end face facing away from each other along a second direction perpendicular to the first direction, wherein: the sliding groove penetrates through one of the upper end face or the lower end face along the second direction, and the resistance adjusting block is used for moving in the sliding groove along the second direction. So as to promote convenience and usability in manufacturing.

In one example, the flow resistance adjustment device may include a liquid collecting port for communicating the runner with one opening of the coolant channel, the liquid collecting port having a length in the second direction that is smaller than a length of the runner. The volume in the chute can be adjusted by adjusting the sliding position of the resistance adjusting block in the chute, so that the flow resistance of the cooling medium when flowing through the chute is adjusted.

In one example, the flow resistance adjustment means may comprise a through hole penetrating the chute in the first direction, the through hole having an inner diameter smaller than an inner diameter of the chute. The volume in the chute can be adjusted by adjusting the sliding position of the resistance adjusting block in the chute, so that the flow resistance of the cooling medium when flowing through the chute is adjusted.

In one example, the first liquid collecting pipe may include two flow resistance adjusting devices, which are sequentially arranged in the second direction, and one end surface of the heat exchange plate includes two openings of the cooling liquid channel. Wherein: a flow resistance adjusting means for communicating with an opening of the coolant passage; the other flow resistance adjusting means is for communicating with the other opening of the coolant passage. The flow resistance of the first liquid collecting pipe can be effectively adjusted through the two flow resistance adjusting devices, and convenience in use can be improved.

In one example, the first header includes a through groove and a plug, the through groove extending through the upper end face and the lower end face along the second direction, the plug being fixedly disposed in the through groove, wherein: the part between the plug and the upper end surface in the through groove forms a chute of the flow resistance adjusting device; the part between the plug and the lower end face in the through groove forms a chute of the other flow resistance adjusting device. The through groove is of a penetrating structure, so that convenience in manufacturing is improved.

In one example, the first header may include a protrusion, the liquid collecting ports of the two flow resistance adjusting devices are sequentially disposed in the protrusion along the second direction, one end face includes a recess, and the two openings of the cooling liquid channel are sequentially disposed in the recess along the second direction, the protrusion is used for being embedded in the recess, so as to achieve connection stability between the first header and the heat exchange plate and accuracy in butt joint.

In one example, the length of the protrusion in the second direction is greater than the sum of the lengths of the two liquid collecting ports, the length of the recess in the second direction is greater than the sum of the lengths of the two openings, and the width of each liquid collecting port in the first direction is smaller than the inner diameter of the chute or through slot of each flow resistance adjustment device.

When specifically setting up, first collector tube can include four sides, and four sides are adjacent with up end and lower terminal surface respectively, wherein: the first side face is opposite to the second side face, the first side face is opposite to one end face of the heat exchange plate, and the first side face is used for arranging a protruding part; the third side face and the fourth side face are oppositely arranged along the first direction, and at least one of the third side face or the fourth side face is used for arranging a through hole so as to facilitate the convenience in use.

In one example, the heat exchange plate assembly includes a plurality of heat exchange plate assemblies, and the plurality of heat exchange plate assemblies are arranged at intervals along the first direction, and at least one electric core assembly is arranged between two adjacent heat exchange plate assemblies, so that efficiency in adjusting the temperature of the electric core assembly can be effectively improved.

In one example, two adjacent heat exchange plate assemblies may each include two flow resistance adjustment means, the two flow resistance adjustment means of the two adjacent heat exchange plate assemblies being in communication through the through-hole, respectively.

In one example, a fourth side of the first header of one of the plurality of heat exchanger plate assemblies is provided with a total liquid inlet in communication with a chute of one of the flow resistance restriction devices in the first header; the fourth side of the first liquid collecting pipe of the other heat exchange plate assembly is provided with a total liquid outlet which is communicated with a chute of a flow resistance setting and saving device in the first liquid collecting pipe of the other heat exchange plate assembly, so that convenience of the related pipeline in arrangement is improved.

In one example, one opening of the cooling liquid channel may be a liquid inlet, and the other opening of the cooling liquid channel may be a liquid outlet, and the functions of the openings may be flexibly adjusted according to actual use requirements.

In one example, the battery pack further includes a second liquid collecting pipe, the heat exchange plate includes another end face, the another end face faces away from the one end face, the cooling liquid channel includes a first cooling liquid channel and a second cooling liquid channel, wherein: the second liquid collecting pipe comprises a cavity, a third liquid collecting port and a fourth liquid collecting port, and the cavity is connected with the first cooling channel through the third liquid collecting port and is communicated with the second cooling channel through the fourth liquid collecting port; the first cooling liquid channel is communicated with a flow resistance adjusting device through an opening; the second coolant channel communicates with another flow resistance adjustment means through another opening. The flexibility of the cooling liquid channel in arrangement can be effectively improved by using the second liquid collecting pipe.

In a second aspect, the present application further provides an energy storage system, which may include at least one of a power conversion device or a power generation device, and the battery pack described above, where the power conversion device is configured to: receiving alternating current or direct current provided by power generation equipment or an external power supply and outputting the direct current to charge a battery pack; or, receives the power of the battery pack and outputs alternating current or direct current. By applying the battery pack, the heat dissipation performance and the temperature uniformity of the energy storage system can be effectively improved, and the reliability and the safety of the energy storage system are guaranteed.

Drawings

Fig. 1 is a schematic and schematic illustration of a conventional battery pack provided herein;

fig. 2 is a schematic perspective view of a battery pack according to an embodiment of the present disclosure;

fig. 3 is a schematic structural view of a heat exchange plate assembly according to an embodiment of the present disclosure;

fig. 4 is a schematic cross-sectional structure of a heat exchange plate assembly according to an embodiment of the present disclosure;

fig. 5 is a schematic perspective view of a first liquid collecting tube according to an embodiment of the present disclosure;

fig. 6 is a schematic cross-sectional structure of a first liquid collecting tube according to an embodiment of the present disclosure;

fig. 7 is a schematic sectional view of a part of a first header and a heat exchange plate according to an embodiment of the present application;

Fig. 8 is a schematic structural view of a steering tube according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

fig. 10 is a schematic plan view of a battery pack according to an embodiment of the present disclosure;

fig. 11 is a schematic structural view of a heat exchange plate assembly in a battery pack according to an embodiment of the present disclosure;

fig. 12 is a schematic structural view of a flow path of a battery pack according to an embodiment of the present disclosure;

fig. 13 is a schematic structural view of a heat exchange plate assembly in another battery pack according to an embodiment of the present disclosure;

fig. 14 is a schematic structural view of a flow path of another battery pack according to an embodiment of the present disclosure;

fig. 15 is an exploded view of another battery pack according to an embodiment of the present application;

fig. 16 is a block diagram of an energy storage system according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

In order to facilitate understanding of the battery pack provided in the embodiments of the present application, an application scenario thereof will be described first.

The battery pack provided by the embodiment of the application can be applied to the scenes of household energy storage, industrial energy storage, data centers, vehicles and the like and used for storing and releasing electric energy.

In practice, a plurality of cells may be typically included in a battery pack in order to enable the battery pack to store a sufficient amount of electrical energy. In order to reduce the size of the battery pack, the position layout of the plurality of battery cells is compact. During the charge and discharge of the battery cell, heat is generated. In order to avoid the occurrence of an excessively high temperature, a heat dissipation structure may be provided in the battery pack.

The existing heat dissipation structure is generally divided into an air cooling mode and a liquid cooling mode. The heat dissipation structure of the air cooling mode mainly depends on air flow to take away heat on the surface of the battery cell, so that the heat dissipation purpose is achieved. The heat dissipation structure of the liquid cooling mode mainly depends on the circulation of a medium (such as water or oil) to take away the heat on the surface of the battery cell, so that the purpose of heat dissipation is achieved. The liquid cooling type heat dissipation structure has a higher heat dissipation efficiency and a smaller occupied volume, and is therefore widely used in the industry.

However, the conventional liquid cooling type heat dissipation structure still has a number of disadvantages.

For example, as shown in fig. 1, a battery pack 01 adopting a liquid cooling system generally includes a plurality of heat exchange plates 011 and electric cells 012, and an outer surface (e.g., a lower surface in the drawing) of each electric cell 012 is thermally bonded to a plate surface (e.g., an upper plate surface in the drawing) of each heat exchange plate 011, so that the heat exchange plates 011 can cool the electric cells 012. The heat exchange plates 011 are sequentially communicated through the pipeline 013, a medium enters the flow path from the inlet and is discharged from the outlet, and the medium sequentially passes through the heat exchange plates 011 during circulation, so that heat exchange with the heat exchange plates 011 is realized, and the electric core 012 is cooled.

In the present mode, the temperature of the medium at the inlet is the lowest, and therefore, the heat exchange efficiency with the heat exchange plate 011 near the inlet is also relatively high. As the medium circulates, the temperature of the medium gradually increases, and the heat exchange efficiency between the medium and the heat exchange plate 011 near the outlet also becomes low. Finally, the temperature of the electric core 012 near the inlet is lower, the temperature of the electric core 012 near the outlet is higher, and the temperature difference of the electric core 012 at different positions is larger, so that the problems of insufficient cold energy utilization and poor temperature uniformity exist, and the working reliability and the service life of the battery pack 01 are not guaranteed.

Therefore, the application provides a battery pack with good heat dissipation effect and good temperature uniformity.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings and specific embodiments.

The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include, for example, "one or more" such forms of expression, unless the context clearly indicates to the contrary. It should also be understood that in the following embodiments of the present application, "at least one" means one, two, or more than two.

Reference in the specification to "one embodiment" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more, but not all, embodiments" unless expressly specified otherwise. The terms "comprising," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

As shown in fig. 2 to 4, in one example provided herein, 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 header 111 and a heat exchange plate 112, the heat exchange plate 112 includes a cooling fluid channel 1120 and a plurality of openings, the heat exchange plate 112 is arranged adjacent to the cell assembly 12 along a first direction, the cooling fluid channel 1120 is disposed inside the heat exchange plate 112, at least one opening of the cooling fluid channel 1120 is disposed at one end surface of the heat exchange plate 112, the first header 111 is in communication with at least one opening of the cooling fluid channel 1120, wherein the first header 111 includes at least one flow resistance adjustment device, each flow resistance adjustment device includes a slide groove 1111 and a resistance adjustment block (not shown in the drawing), the slide groove 1111 is in communication with one opening of the cooling fluid channel 1120, and the resistance adjustment block is disposed in the slide groove 1111 and is used for moving along the slide groove 1111. The flow rate adjustment means is used to adjust the flow rate of the medium flowing through the cooling liquid channels 1120 inside the heat exchanger plates 112. In practice, the position of the resistance-adjusting block in the slide slot 1111 can be adjusted to adjust the volume of the slide slot 1111, so that the resistance of the medium flowing through the slide slot 1111 can be adjusted.

In the example provided in the present application, each heat exchange plate 112 is equipped with a flow adjusting device that is independent of each other, so that the flow of each heat exchange plate 112 can be effectively controlled according to the actual use requirement, and thus fine adjustment and control can be achieved.

As shown in fig. 5 to 7, in one example provided herein, the first header tube 111 includes an upper end surface and a lower end surface facing away in a second direction perpendicular to the first direction. Wherein in the example provided in the present application two flow resistance adjustment means are included in the heat exchanger plate assembly 11.

Specifically, the chute 1111 penetrates the upper and lower end surfaces of the first header pipe 111 in the second direction, and the stopper 1113 is provided in the middle of the chute 1111 and separates the chute 1111 into a chute 1111a and a chute 1111b independent of each other in the second direction. The resistance adjusting blocks are two, namely a resistance adjusting block 1112a and a resistance adjusting block 1112b. Resistance adjustment block 1112a is positioned within runner 1111a, and resistance adjustment block 1112a is configured to move within runner 1111a in a second direction.

In the example provided in this application, the chute 1111 penetrates the upper end surface and the lower end surface of the first liquid collecting tube 111, that is, the chute 1111 is of a penetrating structure, and when the chute 1111 is manufactured, it is easy to process, produce and use. After the processing of the chute 1111 is completed, the plug 1113 may be fixed in the chute 1111, so that the chute 1111 may be divided into two parts of the chute 1111a and the chute 1111b.

Specifically, assuming that the length of the chute 1111a is D and the distance between the resistance adjusting block 1112a and the bottom wall of the chute 1111a is D, the flow resistance can be effectively adjusted by adjusting the value of D/D. In the example provided herein, when the resistance block 1112a slides into the chute 1111a, the volume of the chute 1111a may be reduced, thereby increasing the flow resistance of the medium flowing through the chute 1111 a. When the resistance block 1112a slides out of the chute 1111a, the volume of the chute 1111a may be increased, thereby reducing the flow resistance of the medium flowing through the chute 1111 a. That is, by adjusting the volume of the chute 1111a, the flow resistance may be changed, and finally the flow rate of the medium flowing through the heat exchange plate 112 may be effectively regulated.

In addition, in the example provided herein, a resistance adjustment block 1112b is slidably disposed within the runner 1111b for adjusting the volume of the runner 1111 b. In the example provided herein, when the resistance block 1112b slides into the chute 1111b, the volume of the chute 1111b may be reduced, thereby increasing the flow resistance of the medium flowing through the chute 1111 b. When the resistance block 1112b slides out of the chute 1111b, the volume of the chute 1111b may be increased, thereby reducing the flow resistance of the medium flowing through the chute 1111 b. That is, by adjusting the volume of the chute 1111b, the flow resistance can be changed, and finally the flow rate of the medium flowing through the heat exchange plate 112 can be effectively regulated.

In practical use, the sliding position of the resistance block 1112a can be adjusted independently. Alternatively, the sliding position of the resistance block 1112b may be independently adjusted. Alternatively, the sliding positions of the

resistance adjusting blocks

1112a and 1112b may be adjusted at the same time.

In other examples, the chute 1111 may extend through only one of the upper end surface and the lower end surface of the first header pipe 111. When the chute 1111 penetrates only to one of the upper end surface or the lower end surface of the first liquid collecting pipe 111, only one resistance adjusting block may be provided, and the plug 1113 may be omitted, which will not be described herein.

In addition, as shown in fig. 5 to 7, in one example provided herein, the flow resistance adjustment device includes a liquid collection port 1114 and a liquid collection port 1115. The liquid collecting port 1114 is used for communicating the sliding groove 1111a with an opening of the cooling liquid channel 1120 in the heat exchange plate 112, and a length of the liquid collecting port 1114 in the second direction is smaller than a length of the sliding groove 1111 a. When the resistance adjusting block 1112a slides in the sliding slot 1111a along the second direction, the flow resistance of the sliding slot 1111a can be effectively adjusted, so that the flow rate of the medium flowing through the liquid collecting port 1114 can be adjusted. Accordingly, the liquid collecting opening 1115 is configured to communicate the runner 1111b with an opening of a cooling liquid channel in the heat exchange plate 112, and a length of the liquid collecting opening 1115 in the second direction is smaller than a length of the runner 1111 b. When the resistance adjusting block 1112b slides in the sliding slot 1111b along the second direction, the flow resistance of the sliding slot 1111b can be effectively adjusted, so that the flow rate of the medium flowing through the liquid collecting port 1115 can be adjusted.

In addition, the flow resistance adjustment means includes a through hole 1116 and a through hole 1117. Wherein the through hole 1116 penetrates through the chute 1111a along the first direction, and the inner diameter of the through 1116 hole is smaller than the inner diameter of the chute 1111 a. The cooling medium may flow from the through hole 1116 into the chute 1111a and out of the liquid collecting port 1114. By adjusting the sliding position of the resistance block 1112a in the slide 1111a, the volume in the slide 1111a can be adjusted, thereby adjusting the flow resistance of the cooling medium when flowing through the slide 1111 a. Accordingly, the through hole 1117 penetrates the sliding slot 1111b in the first direction, and the inner diameter of the through hole 1117 is smaller than the inner diameter of the sliding slot 1111 b. The cooling medium may flow into the chute 1111b through the through hole 1117 and flow out of the liquid collecting port 1115. By adjusting the sliding position of the resistance block 1112b in the slide 1111b, the volume in the slide 1111b can be adjusted, thereby adjusting the flow resistance of the cooling medium when flowing through the slide 1111 b.

As shown in fig. 5 to 7, the first liquid collecting pipe 111 includes a boss 1118, and the liquid collecting port 1114 and the liquid collecting port 1115 are provided to the boss 1118 along the second direction. The first end surface of the heat exchange plate 112 includes a recess 1121, and the opening 1122 and the opening 1123 of the coolant passage 1120 are sequentially provided in the recess 1121 in the second direction. The protrusion 1118 is configured to fit within the recess 1121 to provide communication between the liquid collection port 1114 and the opening 1122 and to provide communication between the liquid collection port 1115 and the opening 1123. After the

liquid collecting ports

1114 and 1115 are sequentially arranged along the second direction, the heat dissipation area of the heat dissipation channel outlet is improved.

In particular arrangements, the length of the boss 1118 in the second direction is greater than the sum of the lengths of the liquid collection port 1114 and the liquid collection port 1115. The length of the recess 1121 in the second direction is greater than the sum of the lengths of the

openings

1122 and 1123. In addition, in the first direction (direction perpendicular to the plane of fig. 7), the width of each of the

liquid collection ports

1114 and 1115 is smaller than the inner diameter of the

runner

1111a or 1111b of each flow resistance adjustment means. The resistance block 1112a is effective to adjust the flow resistance of the cooling medium when flowing through the liquid collection port 1114 and the opening 1122 when sliding in the second direction. The resistance block 1112b can effectively regulate the flow resistance of the cooling medium flowing through the liquid collecting port 1115 and the opening 1123 when sliding in the second direction.

As shown in fig. 5, in the example provided herein, the first header 111 is a generally rectangular cylindrical structure. The first header 111 includes four sides, first side 11101, second side 11102, third side 11103, and fourth side 11104, respectively. The four side faces are adjacent to the upper end face and the lower end face respectively. The first side 11101 faces away from the second side 11102, the first side 11101 is disposed opposite to one end face of the heat exchange plate 112, and the first side 11101 is configured to provide the protruding portion 1118. Third side 11103 is disposed opposite fourth side 11104 in the first direction, and at least one of third side 11103 or fourth side 11104 is configured to provide through-holes 1116 and through-holes 1117.

As shown in fig. 2, in one example provided herein, a battery pack 10 may include two heat exchange plate assemblies 11 and one cell assembly 12. The first header tubes 111 in both heat exchanger plate assemblies 11 are in communication via the piping 114 such that each heat exchanger plate assembly 11 is in a parallel relationship, whereby interactions between different heat exchanger plate assemblies 11 can be avoided. In addition, the heat exchange plate assemblies 11 and the cell assemblies 12 are alternately arranged in sequence along the first direction, and the cell assemblies 12 are in heat conduction fit with the two heat exchange plates 112, so that heat exchange between the heat exchange plates 112 and the cell assemblies 12 is realized. Wherein the first direction is the thickness direction of the heat exchange plate 112.

In the example that this application provided, electric core subassembly 12 can cool down through heat exchange plate subassembly 11 to adopt parallelly connected setting mode between the heat exchange plate subassembly 11, can avoid the medium to circulate in proper order between the heat exchange plates 112 of difference, make the temperature of the medium of flowing through every heat exchange plate 112 be the basically the same, thereby can effectively reduce the difference in temperature of electric core 121, be favorable to guaranteeing the sameness of whole battery package 10, also be favorable to promoting the utilization effect of medium cold volume.

The structural form of the heat exchanger plate assembly 11 may be varied in specific arrangement.

As shown in fig. 3, in one example provided herein, the heat exchange plate 112 is a rectangular plate-like structure.

As shown in fig. 4, the heat exchange plate 112 has a coolant passage 1120 through which a medium flows. The cooling fluid channels 1120 include two linear channels, namely a first cooling fluid channel 1120a and a second cooling fluid channel 1120b, and one ends of the two cooling fluid channels are located on a first side (e.g., a left side in fig. 4) of the heat exchange plate 112, and the other ends of the two cooling fluid channels are located on a second side (e.g., a right side in fig. 4) of the heat exchange plate 112. In the example of fig. 4, two coolant flow passages are schematically shown. In practical applications, the number of the cooling fluid channels may be one, two or more, which is not limited in this application.

In addition, as shown in fig. 4 and 8, in the example provided herein, the heat exchanger plate assembly 11 further includes a second header 113, and the second header 113 may interface with the flow channels in the heat exchanger plate 112 to facilitate connection between the flow channels. Specifically, the second liquid collecting pipe 113 has a tubular structure with both ends closed. The side wall of the second liquid collecting tube 113 has two elongated through holes, namely a through hole 1131 and a through hole 1132. The openings of the two flow channels in the heat exchanger plate 112 at the second side are

openings

1124 and 1125, respectively. Wherein the second liquid collecting tube 113 is disposed at the second side of the heat exchange plate 112, and the liquid collecting port 1131 may be docked with the opening 1124; the liquid collection port 1132 may interface with the opening 1125. Communication between the two flow channels is achieved by means of the second liquid collecting pipe 113. In practice, the opening 1122 of the cooling fluid channel 1120 at the first side of the heat exchange plate 112 may be used as a fluid inlet, and the opening 1123 of the cooling fluid channel 1120 at the first side of the heat exchange plate 112 may be used as a fluid outlet. That is, the cooling medium may enter the cooling liquid passage 1120 through the opening 1122, and the cooling medium may flow out through the opening 1123. That is, the liquid inlet end and the liquid outlet end of the heat exchange plate 112 may be located on the same side (i.e., the first side) of the heat exchange plate 112, so as to facilitate the layout of other related pipelines.

Or it can be understood that, in the example provided in the present application, the flow channels in the heat exchange plate 112 are straight, and the structure is simpler. The manufacturing cost can be effectively reduced when manufacturing is performed, and the high yield is achieved. In addition, by arranging the second liquid collecting pipe 113 on the side surface of the heat exchange plate 112, communication between different channels can be realized, and meanwhile, the flowing direction of the medium can be changed, so that the liquid inlet end and the liquid outlet end of the heat exchange plate 112 can be positioned on the same side surface (such as the first side surface) of the heat exchange plate 112, and the laying of external pipelines is facilitated.

It will be appreciated that in practical applications, the second liquid collecting pipe 113 may have other configurations.

For example, the second liquid collecting pipe 113 may include a plurality of independent connection pipes, and both ends of the connection pipes may be respectively abutted with the corresponding flow passages.

Alternatively, in other examples, the cooling liquid channel 1120 in the heat exchange plate 112 may be U-shaped, that is, both ends of the cooling liquid channel 1120 may be located on the same side of the heat exchange plate 112, so that the second liquid collecting tube 113 may be omitted.

It can be appreciated that in practical applications, the structural types of the heat exchange plate 112 and the second liquid collecting tube 113 can be reasonably selected and adjusted according to practical requirements, which is not described herein.

In addition, the type of structure of the first header 111 may also be varied in specific applications.

The type and number of cells 121 included in the cell assembly 12 may vary depending on the particular application.

For example, the battery cell 121 may be a lithium ion battery, a sodium ion battery, or other types, and the specific type of the battery cell 121 is not limited in this application.

In addition, as shown in fig. 9, in an example provided herein, the cell 121 has a rectangular block structure in shape, having 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. Of these, the areas of the side surfaces 121c and 121d are small, and the areas of the

side surfaces

121e and 121f are large.

As shown in fig. 2 and 9, in the example provided in this application, the sides (such as the side 121e or the side 121 f) with larger areas between two adjacent cells 121 are attached to each other, so that a larger contact area is provided between two adjacent cells 121. When extrusion acting force exists between two adjacent electric cores 121, deformation of the two adjacent electric cores 121 can be effectively prevented, and structural strength and safety of the electric core assembly 12 are guaranteed.

In addition, two sides (such as the side 121c or the side 121 d) with smaller areas of the electric core 121 are thermally bonded to the adjacent heat exchange plates 112, so that the temperature difference of different areas of the electric core 121 can be effectively reduced, and the uniformity of the electric core 121 is guaranteed. In some examples, a thermal pad or other structure may be disposed between the contact surfaces of the cells 121 and the heat exchange plate 112 to enhance the thermal conduction effect between the cells 121 and the heat exchange plate assembly 11.

In the examples provided above, the exemplary illustration is made with the battery pack 10 including one cell assembly 12 and two heat exchange plate assemblies 11.

In addition, as shown in fig. 10, in the example provided in the present application, the number of the cell assemblies is four, which are the cell assembly 12a, the cell assembly 12b, the cell assembly 12c, and the cell assembly 12d, respectively. The number of the heat exchange plate assemblies is five, namely a heat exchange plate assembly 11a, a heat exchange plate assembly 11b, a heat exchange plate assembly 11c, a heat exchange plate assembly 11d and a heat exchange plate assembly 11e. I.e. the number of heat exchanger plate assemblies is one more than the number of cell assemblies. When specifically setting up, heat transfer board subassembly and electric core subassembly set gradually along the thickness direction of heat transfer board in turn for the both sides of every electric core subassembly all with the heat conduction laminating of different heat transfer boards, can promote the cooling effect of electric core subassembly. In addition, two adjacent cell assemblies can be effectively isolated through the heat exchange plate, so that the mutual influence between the two adjacent cell assemblies can be avoided, and the safety and the cooling performance of the whole battery pack 10 can be improved.

Of course, the number of cell assemblies may be two, three or more in a particular arrangement. The number of heat exchanger plate assemblies may be three, four or more. In general, when the number of the heat exchange plate assemblies is N in a specific arrangement, the number of the battery cell assemblies is N-1, wherein N is an integer greater than or equal to 3.

In addition, the flow rate of the medium flowing through each heat exchange plate can be the same or different in specific application.

It should be noted that, in practical application, there is a flow resistance in both the pipeline and the heat exchange plate, and in the pipeline, the flow resistance is proportional to the length of the pipeline. Therefore, in order to facilitate the explanation of the flow rate through the different heat exchange plates, the flow resistance of the flow path in which the different heat exchange plates are located will be specifically explained below.

As shown in fig. 11 and 12, the total inlet 101 of the battery pack 10 is located in the first liquid collecting pipe 111a, and the total outlet 102 is located in the first liquid collecting pipe 111 e. The liquid inlets of the five first liquid collecting pipes are sequentially communicated through a pipeline 114, and the liquid outlets of the five first liquid collecting pipes are sequentially communicated through a pipeline 115. The five heat exchange plates have substantially the same structure, and therefore, the thermal resistance R of each heat exchange plate _{Board board} Substantially identical. In addition, the eight

tubes

114, 115 in FIG. 11 are substantially the same size, and therefore, the thermal resistance R of each tube _Pipe The same is true.

The medium flow paths of the flow path 1 where the heat exchange plate 112a is located are, in order: heat exchanger plates 112a, tubing, piping, and piping.

The medium flow paths of the flow path 2 where the heat exchange plate 112b is located are in order: piping, heat exchange plates 112b, piping, and piping.

The medium flow path of the flow path 3 in which the heat exchange plate 112c is located is, in order: piping, heat exchange plates 112c, piping and piping.

The medium flow paths of the flow path 4 in which the heat exchange plate 112d is located are, in order: piping, tubing, piping, heat exchanger plates 112d, and piping.

The medium flow paths of the flow path 5 where the heat exchange plate 112e is located are in order: piping, tubing, piping, and heat exchanger plate 112e.

The flow resistance of each flow path is R _Pipe *5+R _{Board board} Thus, in the example provided in fig. 11, the flow resistances of the five flow paths are substantially the same.

Let the flow rate of the medium flowing through the heat exchange plate 112a be M _{Board 1} The flow rate of the medium flowing through the heat exchange plate 112b is M _{Board 2} The flow rate of the medium flowing through the heat exchange plate 112c is M _{Plate 3} The flow rate of the medium flowing through the heat exchange plate 112d is M _{Plate 4} The flow rate of the medium flowing through the heat exchange plate 112e is M _{Plate 5} 。

In case that the flow resistance of each first header is the same, the relationship between the flow rates obtained by the different heat exchanger plates can be known from the flow resistances in the different flow paths described above as: m is M _{Plate 3} ＝M _{Board 2} ＝M _{Plate 4} ＝M _{Board 1} ＝M _{Plate 5} 。

Assume that the flow obtained by cell assembly 12a is M _{Electric 1} The flow obtained by the cell assembly 12b is M _{Electric 2} The flow obtained by the cell assembly 12c is M _{Electric 3} The flow obtained by the cell assembly 12d is M _{Electric 4} 。

Because the cell assembly 12a is thermally bonded to the

heat exchanger plates

112a and 112b, the flow M obtained by the cell assembly 12a _{Electric 1} ＝M _{Board 1} +M _{Board 2} /2。

Because the cell assembly 12b is thermally conductive to the

heat exchanger plates

112b and 112c, the flow M obtained by the cell assembly 12b _{Electric 2} ＝(M _{Board 2} +M _{Plate 3} )/2。

Because the cell assembly 12c is thermally conductive and bonded to the heat exchanger plate 112c and the heat exchanger plate 112d, the flow obtained by the cell assembly 12cM _{Electric 3} ＝(M _{Plate 3} +M _{Plate 4} )/2。

Because the cell assembly 12d is thermally bonded to the heat exchanger plate 112d and the heat exchanger plate 112e, the flow M obtained by the cell assembly 12d _{Electric 4} ＝M _{Plate 5} +M _{Plate 4} /2。

In practical application, the flow obtained by adjusting each cell assembly is basically the same by adjusting the flow resistance of different first liquid collecting pipes, so that the temperature uniformity among different cell assemblies can be ensured.

Of course, in practical applications, the flow resistances in the different flow paths may also be different.

For example, the

heat exchange plates

112a and 112e dissipate heat from one cell assembly, respectively, and thus the

heat exchange plates

112a and 112e require lower amounts of cooling. The

heat exchange plates

112b, 112c and 112d radiate heat from the adjacent two cell assemblies, respectively, and thus the cooling capacity required for the

heat exchange plates

112b, 112c and 112d is high. In practical application, the flow resistances of the first liquid collecting tube 111a and the first liquid collecting tube 111e can be adjusted to be larger, and the flow resistances of the first liquid collecting tube 111b, the first liquid collecting tube 111c and the first liquid collecting tube 111d can be adjusted to be smaller, so that the reasonable utilization of the cold energy can be realized, the heat dissipation effect of the whole battery pack 10 can be improved, and the temperature difference between different battery cell assemblies can be reduced.

In addition, in the above example, the total liquid inlet 101 of the battery pack 10 is located in the first liquid collecting pipe 111a, and the total liquid outlet 102 is located in the first liquid collecting pipe 111 e. That is, the total liquid inlet 101 and the total liquid outlet 102 of the battery pack 10 are respectively located in the first liquid collecting pipe at the edge, and are convenient to be in butt joint with an external pipeline when being deployed.

Of course, in other examples, the total inlet 101 and the total outlet 102 of the battery pack 10 may be located in other first liquid collection tubes.

For example, as shown in fig. 13 and 14, in another example provided herein, the total liquid inlet 101 and the total liquid outlet 102 of the battery pack 10 are both provided in the first liquid collecting pipe 111 c.

Specifically, the medium flow path of the flow path 1 in which the heat exchange plate 112a is located depends on the heat exchange plate 112a.

The medium flow paths of the flow path 4 in which the heat exchange plate 112d is located are, in order: piping, heat exchange plates 112d, piping and piping.

The medium flow paths of the flow path 5 where the heat exchange plate 112e is located are in order: piping, heat exchange plates 112e, piping and piping.

Wherein the flow resistance R of the flow path 1 _{Stream 1} The method comprises the following steps: r is R _{Board board} 。

Flow resistance R of flow path 2 _{Stream 2} Is R plate+R _Pipe *3。

Flow resistance R of flow path 3 _{Stream 3} Is R plate+R _Pipe *3。

Flow resistance R of flow path 4 _{Stream 4} Is R plate+R _Pipe *4。

Flow resistance R of flow path 5 _{Stream 5} Is R plate+R _Pipe *4。

It is evident from the comparison that: r is R _{Stream 1} <R _{Stream 2} ＝R _{Stream 3} <R _{Stream 4} ＝R _{Stream 5} 。

In case that the flow resistance of each first header is the same, the relationship between the flow rates obtained by the different heat exchanger plates can be known from the flow resistances in the different flow paths described above as: m is M _{Plate 3} >M _{Board 2} ＝M _{Plate 4} >M _{Board 1} ＝M _{Plate 5} 。

Because the cell assembly 12a is thermally bonded to the

heat exchanger plates

Because the cell assembly 12b is thermally conductive to the

heat exchanger plates

Because the cell assembly 12c is thermally conductive to the heat exchanger plate 112c and the heat exchanger plate 112d, the flow M obtained by the cell assembly 12c _{Electric 3} ＝(M _{Plate 3} +M _{Plate 4} )/2。

In practical applications, since the

cell assemblies

12b and 12c are located in the middle of the battery pack 10, if the temperatures of the

cell assemblies

12b and 12c are high, slight thermal expansion may occur, which may reduce the safety of the battery pack 10. In the example provided in this application, after the total liquid inlet 101 and the total liquid outlet 102 are disposed in the first liquid collecting pipe located at the middle position, the flow resistance of the flow path (such as the flow path 2 and the flow path 3) where the middle heat exchange plate is located can be effectively reduced, and the safety of the battery pack 10 can be effectively improved.

It will be appreciated that in the above example, the exemplary illustration is given by way of example of the inclusion of five heat exchange plate assemblies in the battery pack 10. In other examples, the number of heat exchange plate assemblies may also be three, five or more.

In general, the battery pack 10 may include N heat exchange plate assemblies therein. Along the first direction, N heat exchange plate assemblies are sequentially arranged, and N first liquid collecting pipes are sequentially communicated through pipelines. The total liquid inlet 101 and the total liquid outlet 102 of the heat exchange plate assembly are both positioned in the (n+1)/2 th first liquid collecting pipe, wherein N is an odd number greater than or equal to 3.

Of course, the number of heat exchange plate assemblies in the battery pack 10 may also be four, six or more.

In general, the battery pack 10 may include N heat exchange plate assemblies therein. Along the first direction, N heat exchange plate assemblies are sequentially arranged, and N first liquid collecting pipes are sequentially communicated through pipelines. The total inlet 101 and the total outlet 102 of the heat exchanger plate assembly are located in the N/2 th first header. Or both the total inlet 101 and the total outlet 102 may be located in the N/2+1 first header. Wherein N is an even number greater than or equal to 4.

In practical application, the number of the heat exchange plate assemblies and the electric core assemblies can be flexibly selected and adjusted according to practical requirements, and details are omitted herein.

In addition, as shown in fig. 15, in an example provided herein, the battery pack 10 further includes a housing 14, and the heat exchange plate assembly 11 and the battery cell assembly 12 are disposed in the housing 14, so that the housing 14 can effectively protect the battery cell assembly 12 and the heat dissipation plate assembly 11.

Specifically, in the example provided herein, the housing 14 includes a bottom plate 143, an upper cover 141, and a top cover 142. In a specific arrangement, the bottom plate 143, the upper cover 141 and the top cover 142 may be fixedly connected by screws, or may be connected by welding, bonding, or the like, which is not limited in this application.

In addition, in practical applications, the battery pack 10 may be used in home energy storage, industrial energy storage, data center, vehicles, etc. for storing and releasing electric energy.

For example, as shown in fig. 16, the embodiment of the present application further provides an energy storage system, which may include at least one of a power conversion device or a power generation device, and the battery pack described above, where the power conversion device is configured to receive an alternating current or a direct current provided by the power generation device or an external power source and output the direct current to charge the battery pack; or, receiving the power of the battery pack and outputting alternating current or direct current includes an inverter and the battery pack.

Among them, the power conversion device may include an alternating current-direct current (AC-DC) converter and a direct current-direct current (DC-DC) converter. The electric network is connected with the battery pack through the AC-DC converter, and the AC-DC converter can convert alternating current in the electric network into direct current and then provide the direct current for the battery pack to store energy.

The battery pack can be connected with the power receiving equipment (such as a vehicle) through the direct current-direct current converter, and the DC-DC conversion device can supply the voltage of the direct current to the power receiving equipment after boosting or reducing the voltage, so that the actual requirement of the power receiving equipment on the charging power is met.

In addition, in one possible embodiment, a power generation device may be further included, and the power generation device may be connected to the battery pack through a DC-DC converter. The DC-DC converter may step up or step down the voltage of the direct current generated by the power generation device and supply the voltage to the battery pack. The power generation equipment can be photovoltaic power generation equipment, wind power generation equipment and the like, and the specific type of the power generation equipment is not limited.

Wherein the grid and the power generation device may exist at the same time, or may include only the power generation device.

In addition, the energy storage system can further comprise a battery management system, the battery management system can effectively detect parameters such as the temperature, the state of charge and the state of health of the battery pack, and can effectively regulate and control the charge and discharge functions of the battery pack, so that the normal operation of the energy storage equipment is ensured.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a battery package, its characterized in that includes heat exchange plate subassembly and electric core subassembly, heat exchange plate subassembly includes first collector tube and heat exchange plate, the heat exchange plate includes coolant liquid passageway and a plurality of opening, follows the first direction the heat exchange plate with electric core subassembly is adjacent arranges, the coolant liquid passageway set up in the inside of heat exchange plate, at least one of coolant liquid passageway the opening set up in an terminal surface of heat exchange plate, first collector tube with at least one of coolant liquid passageway the opening is linked together, wherein:

the first liquid collecting pipe comprises at least one flow resistance adjusting device, each flow resistance adjusting device comprises a sliding groove and a resistance adjusting block, the sliding grooves are communicated with one opening of the cooling liquid channel, and the resistance adjusting blocks are arranged in the sliding grooves and used for moving along the sliding grooves.

2. The battery pack of claim 1, wherein the first header includes an upper end face and a lower end face, the upper end face and the lower end face facing away in a second direction perpendicular to the first direction, wherein:

the sliding groove penetrates through one of the upper end face or the lower end face along the second direction, and the resistance adjusting block is used for moving in the sliding groove along the second direction.

3. The battery pack according to any one of claims 1-2, wherein the flow resistance adjustment means includes a liquid collecting port for communicating the runner with one of the openings of the coolant passage, the liquid collecting port having a length smaller than a length of the runner in the second direction.

4. A battery pack according to any one of claims 1-3, wherein the flow resistance adjustment means comprises a through hole extending through the chute in a first direction, the through hole having an inner diameter smaller than the inner diameter of the chute.

5. The battery pack according to any one of claims 1 to 4, wherein the first header pipe includes two of the flow resistance adjustment devices, the two flow resistance adjustment devices being arranged in order in the second direction, and one end surface of the heat exchange plate includes two of the openings of the coolant passage, wherein:

one of said flow resistance adjustment means being adapted to communicate with one of said openings of said coolant channel;

the other one of the flow resistance adjustment means is for communicating with the other one of the openings of the coolant passage.

6. The battery pack of claim 5, wherein the first header includes a through slot and a plug, the through slot extending through the upper end face and the lower end face in the second direction, the plug being fixedly disposed in the through slot, wherein:

The part between the plug and the upper end surface in the through groove forms a chute of the flow resistance adjusting device;

the part between the plug and the lower end surface in the through groove forms a chute of the other flow resistance adjusting device.

7. The battery pack according to claim 5, wherein the first liquid collecting pipe includes a convex portion, the liquid collecting ports of the two flow resistance adjusting devices are sequentially disposed in the convex portion along the second direction, the one end face includes a concave portion, the two openings of the cooling liquid channel are sequentially disposed in the concave portion along the second direction, and the convex portion is configured to be embedded in the concave portion.

8. The battery pack according to claim 7, wherein the length of the protruding portion is greater than the sum of the lengths of the two liquid collecting ports in the second direction, the length of the recessed portion is greater than the sum of the lengths of the two openings in the second direction, and the width of each liquid collecting port is smaller than the inner diameter of the slide groove or the through groove of each flow resistance adjusting device in the first direction.

9. The battery pack of claim 7, wherein the first header includes four sides adjacent the upper end face and the lower end face, respectively, wherein:

The first side face is opposite to the second side face, the first side face is opposite to the one end face of the heat exchange plate, and the first side face is used for arranging the protruding part;

the third side face and the fourth side face are arranged opposite to each other along the first direction, and at least one of the third side face or the fourth side face is used for arranging the through hole.

10. The battery pack of claim 8, wherein the heat exchange plate assembly comprises a plurality of heat exchange plate assemblies, the plurality of heat exchange plate assemblies being spaced apart along a first direction, at least one of the cell assemblies being disposed between two adjacent heat exchange plate assemblies.

11. The battery pack according to claim 10, wherein two adjacent heat exchange plate assemblies each include two of the flow resistance adjustment devices, and two of the flow resistance adjustment devices of two adjacent heat exchange plate assemblies are each communicated through the through-hole.

12. The battery pack of claim 10, wherein the fourth side of the first header of one of the plurality of heat exchange plate assemblies is provided with a total liquid inlet in communication with a chute of one of the flow resistance devices in the first header;

The fourth side face of the first liquid collecting pipe of the other heat exchange plate assembly is provided with a total liquid outlet which is communicated with a chute of one flow resistance setting section device in the first liquid collecting pipe of the other heat exchange plate assembly.

13. The battery pack of any one of claims 1-12, wherein the one opening of the coolant channel is a liquid inlet and the other opening of the coolant channel is a liquid outlet.

14. The battery pack of any one of claims 1-13, further comprising a second header, the heat exchange plate comprising another end face facing away from the one end face, the coolant channels comprising a first coolant channel and a second coolant channel, wherein:

the second liquid collecting pipe comprises a cavity, a third liquid collecting port and a fourth liquid collecting port, wherein the cavity is connected with the first cooling channel through the third liquid collecting port and is communicated with the second cooling channel through the fourth liquid collecting port;

the first cooling liquid channel is communicated with one flow resistance adjusting device through the opening;

The second coolant passage communicates with another one of the flow resistance adjustment devices through the other opening.

15. An energy storage system comprising at least one of a power conversion device or a power generation apparatus and a battery pack according to any one of claims 1 to 14, the power conversion device being configured to:

receiving alternating current or direct current provided by the power generation equipment or an external power supply and outputting the direct current to charge the battery pack; or alternatively, the first and second heat exchangers may be,

and receiving the power supply of the battery pack and outputting alternating current or direct current.