CN116315259A

CN116315259A - Battery pack, energy storage system, power station and charging network

Info

Publication number: CN116315259A
Application number: CN202310133259.2A
Authority: CN
Inventors: 李文娟
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-06-23

Abstract

The application provides a battery package, energy storage system, power station and charging network relates to energy technical field to solve the technological problem that the radiating effect is poor, equal Wen Xingbu is good. The battery pack provided by the application can comprise a battery cell assembly, a first heat exchange plate and a second heat exchange plate; the battery cell assembly is provided with a first heat conducting surface and a second heat conducting surface which are opposite, and electrodes of the battery cell assembly are positioned on the first heat conducting surface; the first heat exchange plate is provided with a first plate surface, the first plate surface is provided with a first groove, the first plate surface is in heat conduction contact with the first heat conduction surface, and the electrode is positioned in the first groove; the second heat exchange plate is provided with a second plate surface, and the second plate surface is in heat conduction contact with the bottom surface. The battery pack provided by the application is beneficial to reducing the temperature difference of different areas of the battery cell, so that the temperature uniformity of the battery cell can be improved; each electric core in the electric core assembly can radiate heat through the first heat exchange plate and the second heat exchange plate, so that the cooling effect can be effectively improved, and the running cost of the battery pack can be reduced.

Description

Battery pack, energy storage system, power station and charging network

Technical Field

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

Background

With the continuous development and wide application of clean energy sources, the battery cells are widely applied to various energy storage devices with different types. 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.

In the current scheme, the battery cells are cooled in a single-sided cooling mode. For example, the bottom or side of the cell may be in thermally conductive contact with a cold plate. However, the heat dissipation effect of the mode is poor, so that the temperature difference of different areas of the battery cell is large, and the temperature uniformity of the battery cell is reduced.

Disclosure of Invention

The application provides a radiating effect is better, can promote battery package, energy storage system, power station and the charging network of samming nature.

In a first aspect, the present application provides a battery pack that may include a cell assembly, a first heat exchange plate, and a second heat exchange plate. The battery cell assembly is provided with a first heat conducting surface and a second heat conducting surface which are opposite to each other, and electrodes of the battery cell assembly are all positioned on the first heat conducting surface. The first heat exchange plate is provided with a first plate surface, the first plate surface is provided with a first groove, the first plate surface is in heat conduction contact with the first heat conduction surface, and the electrode is positioned in the first groove. The second heat exchange plate is provided with a second plate surface, and the second plate surface is in heat conduction contact with the bottom surface. The electric core component and the first heat exchange plate can exchange heat through heat conduction contact between the first heat conducting surface and the first plate surface, so that the first heat exchange plate cools or heats the electric core component. The first grooves can provide enough accommodation space for the electrodes, so that the electrodes can be prevented from blocking heat conduction contact between the first heat conduction surface and the second plate surface. In addition, the first heat exchange plate can also provide an effective protection effect for the electrode and related components connected with the electrode, thereby being beneficial to improving the safety of the battery pack. The second heat exchange plate is provided with a second plate surface, and the second plate surface is in heat conduction contact with the bottom surface. The electric core component and the second heat exchange plate can exchange heat through heat conduction contact between the second heat conducting surface and the second plate surface, so that the second heat exchange plate cools or heats the electric core component.

In the battery pack provided by the application, the cell assembly, the first heat exchange plate and the second heat exchange plate can form a sandwich structure. The temperature difference of different areas of the battery cell is reduced, so that the temperature uniformity of the battery cell can be improved, and the service life of the battery pack is guaranteed. In addition, each electric core in the electric core assembly can radiate heat through the first heat exchange plate and the second heat exchange plate, so that the cooling effect can be effectively improved, the requirement of the battery pack on the cooling capacity is low, the running cost of the battery pack can be reduced, and the electric core assembly is suitable for a high-rate scene.

In one example, the cell assembly includes a plurality of cells, and the plurality of cells are disposed sequentially along a first direction. The electrodes of each battery cell comprise a first electrode and a second electrode, the first electrodes of the battery cells are positioned near a first straight line, the second electrodes of the battery cells are positioned near a second straight line, and the first straight line, the second straight line and the first direction are parallel; the first board surface is provided with a plurality of first grooves, one part of the first grooves are all positioned near the first straight line, and the other part of the first grooves are all positioned near the second straight line. The position and the shape of the first groove can be reasonably set according to the position of the electrode in the battery cell and the connection requirements between different electrodes, so that the battery cell has good flexibility.

For example, the battery pack may further include a tab connected between the electrodes of two adjacent cells, and the tab is positioned in the first groove.

In one example, the first plate surface may further have a second groove and a communication groove. One end of the communication groove is communicated with the first groove, and the other end of the communication groove is communicated with the second groove. The second recess and the intercommunication groove can be for being connected to the pencil in the first recess and provide effectual wearing and establish the space, are favorable to guaranteeing the in-service use demand of battery package.

In a specific arrangement, the second recess may be elongate and may lie within a third line. The first straight line, the second straight line and the third straight line are parallel, and the third straight line is located between the first straight line and the second straight line.

The explosion-proof valve of the battery core can be positioned between the first electrode and the second electrode of the battery core, and the second groove is positioned between the two rows of first grooves, so that the second groove can be opposite to the explosion-proof valve of the battery core, and the communication between the second groove and the explosion-proof valve can be realized. When the explosion-proof valve is opened, the gas in the battery cell can be discharged to the outside through the second groove, so that the safety of the battery pack is guaranteed.

When specifically set, the distance between the electrode and the inner wall of the first groove may be greater than or equal to 1mm. So that a sufficient gap between the electrode and the inner wall of the first recess can be ensured, and in addition, the compactness between the different parts of the battery pack is not significantly affected.

The distance between the tab and the inner wall of the first groove may be greater than or equal to 1mm. Therefore, enough gaps between the tabs and the inner wall of the first groove can be ensured, and in addition, the compactness among different parts of the battery pack is not obviously influenced.

In one example, the electrode may have a thermally conductive paste between the electrode and an inner wall of the first recess. The heat-conducting glue can be filled in the gap between the electrode of the battery core and the inner wall of the first groove, so that the structural stability and the heat conductivity between the electrode and the first heat exchange plate are ensured. The heat in the electrode can be effectively transferred to the first heat exchange plate through the heat conducting adhesive, and the heat in the tab can be effectively transferred to the first heat exchange plate through the heat conducting adhesive, so that the electrode and the tab can be prevented from generating adverse conditions such as high temperature.

In one example, the first heat exchange plate comprises a first plate body and a second plate body which are attached along the thickness direction, the first plate surface is positioned on the first plate body, and the runner of the first heat exchange plate is positioned in the second plate body. When making, can carry out the shaping respectively with first plate body and second plate body to adopt suitable technology respectively to make runner and first recess, second recess and intercommunication groove respectively, convenience when can effectively promoting the preparation is favorable to reducing cost of manufacture and the technology degree of difficulty.

In one example, the second heat exchange plate has a peripheral frame located on the second plate face and surrounding the cell assembly. The surrounding frame can improve the position precision between the battery cell component and the second heat exchange plate; in addition, when the heat-conducting glue is filled between the second plate surface and the second heat exchange surface, the surrounding frame can effectively prevent the heat-conducting glue from overflowing, and the quality of the battery pack can be ensured.

In a second aspect, the present application also provides an energy storage system comprising an inverter and any one of the above battery packs. The inverter is electrically connected with the battery pack and is used for converting alternating current into direct current and then providing the direct current to the battery pack, or converting the direct current from the battery pack into alternating 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.

In a third aspect, the present application also provides a power plant comprising a power generation device and any one of the above battery packs. The power generation device is electrically connected with the battery pack and is used for storing generated electric energy into the battery pack. 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.

In a fourth aspect, the present application also provides a charging network comprising a charging post and any one of the above battery packs. The charging pile is electrically connected with a battery pack, and the battery pack is used for providing electric energy for the charging pile so as to supplement energy for the power receiving equipment. 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 side view of a conventional battery pack according to the present application;

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

fig. 3 is an exploded view of a battery pack according to an embodiment of the present disclosure;

fig. 4 is another exploded view of a battery pack according to an embodiment of the present application;

fig. 5 is a schematic perspective view of a battery cell according to an embodiment of the present application;

fig. 6 is a schematic view of a partial cross-sectional structure of a battery pack according to an embodiment of the present disclosure;

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

fig. 8 is a schematic plan view of a first heat exchange plate according to an embodiment of the present application;

fig. 9 is a schematic perspective view of another first heat exchange plate according to an embodiment of the present disclosure;

fig. 10 is a schematic perspective view of a second heat exchange plate according to an embodiment of the present disclosure;

FIG. 11 is a block diagram of an energy storage system according to an embodiment of the present disclosure;

FIG. 12 is a block diagram of a power station according to an embodiment of the present disclosure;

fig. 13 is a schematic diagram of a charging network 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 method generally includes a heat exchange plate 011 and a plurality of electric cells 012, wherein the electric cells 012 are sequentially arranged, and the bottom surface of each electric cell 012 is in heat conduction contact with the heat exchange plate 011, so that the heat exchange plate 011 can cool the electric cells 012. However, the vertical size of the electric core 012 is larger, and the heat at the top of the electric core 012 cannot be efficiently transferred to the bottom, so that the temperature difference between the upper and lower sides of the electric core 012 is larger, which is beneficial to ensuring the temperature uniformity of the electric core 012 and can influence the working reliability and service life of the battery pack 01.

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, in one example provided herein, the battery pack 10 may include a cell assembly 11, a first heat exchange plate 12, and a second heat exchange plate 13. The cell assembly 11 is located between the first heat exchange plate 12 assembly and the second heat exchange plate 13 assembly, so that the entire battery pack 10 can form a sandwich structure. As shown in fig. 3 and 4, the battery cell assembly 11 has a first heat conducting surface 111 and a second heat conducting surface 112 facing away from each other, and electrodes of the battery cell assembly 11 are located on the first heat conducting surface 111; the first heat exchange plate 12 has a first plate surface 121, the first plate surface 121 has a first groove 122, the first plate surface 121 is in heat conduction contact with the first heat conducting surface 111, and the electrode is located in the first groove 122. The heat exchange between the battery cell assembly 11 and the first heat exchange plate 12 can be performed through the heat conduction contact between the first heat conduction surface 111 and the first plate surface 121, so that the first heat exchange plate 12 cools or heats the battery cell assembly 11. The first grooves 122 can provide enough accommodation space for the electrodes, so that the electrodes can be prevented from forming a hindrance to heat conduction contact between the first heat conduction surface 111 and the second plate surface 131. In addition, the first heat exchange plate 12 can provide effective protection for the electrode and the related components connected with the electrode, which is beneficial to improving the safety of the battery pack 10. The second heat exchange plate 13 has a second plate surface 131, and the second plate surface 131 is in heat-conducting contact with the bottom surface. The heat exchange between the battery cell assembly 11 and the second heat exchange plate 13 can be performed through the heat conduction contact between the second heat conduction surface 112 and the second plate surface 131, so that the second heat exchange plate 13 cools or heats the battery cell assembly 11.

In the battery pack 10 provided in the present application, the cell assembly 11, the first heat exchange plate 12 and the second heat exchange plate 13 may form a sandwich structure. The first heat exchange plate 12 can exchange heat with the first heat conducting surface 111 of the battery cell assembly 11, and the second heat exchange plate 13 can exchange heat with the second heat conducting surface 112 of the battery cell assembly 11, so that the temperature difference of different areas of the battery cell 110 can be reduced, the temperature uniformity of the battery cell 110 can be improved, and the service life of the battery pack 10 can be guaranteed. In addition, each electric core 110 in the electric core assembly 11 can radiate heat through the first heat exchange plate 12 and the second heat exchange plate 13, so that the cooling effect can be effectively improved, the requirement of the battery pack 10 on cooling capacity is low, the running cost of the battery pack 10 can be reduced, and the electric core assembly is suitable for a high-magnification scene.

As shown in fig. 4, it should be noted that, in the example provided in the present application, the battery cell assembly 11 includes a plurality of battery cells 110, and the plurality of battery cells 110 are sequentially arranged along the first direction. The electrodes of each cell 110 include a first electrode 113 and a second electrode 114, the first electrodes 113 of the plurality of cells 110 are located in a first straight line L1, the second electrodes 114 of the plurality of cells 110 are located in a second straight line L2, and the first straight line L1, the second straight line L2 and the first direction are parallel, wherein the first direction is a thickness direction of the cell 110. The first straight line L1 and the second straight line L2 are both substantially straight lines, and in practical applications, the positions of the plurality of first electrodes 113 are all located on substantially the same straight line; accordingly, the positions of the plurality of second electrodes 114 are all located on the same substantially straight line.

In practical applications, the first electrode 113 and the second electrode 114 are defined above to facilitate distinguishing and describing the polarities of the battery cells 110, and the first electrode 113 may be a positive electrode or a negative electrode, and the second electrode 114 may be a positive electrode or a negative electrode. That is, the anodes of all the cells 110 may be located in the first line L1, and the cathodes of the cells 110 may be located in the second line. The cathodes of all the cells 110 may be located in the first straight line, and the anodes of the cells 110 may be located in the second straight line L2. It is also possible that the cathodes of some of the electric cells 110 are located in the first straight line L1, the anodes of other electric cells 110 are located in the first straight line L1, the cathodes of some electric cells 110 are located in the second straight line L2, and the anodes of other electric cells 110 are located in the second straight line L2.

In practical application, the positions of the positive electrode and the negative electrode of different battery cells 110 can be reasonably adjusted according to the serial-parallel connection requirements among the battery cells 110 in the battery cell assembly 11, which is not limited in the application.

The thickness direction of the battery cell 110 refers to a direction perpendicular to one of the side surfaces of the battery cell 110. In practical applications, the thickness direction of the battery cell 110 may be set appropriately according to the shape and size of the battery.

For example, as shown in fig. 5, in a battery cell 110 provided herein, the battery cell 110 has a rectangular block structure in shape, and has a top 1101, a bottom 1102, a side 1103, a side 1104, a side 1105, and a side 1106. Wherein the top surface 1101 has a first electrode 113, a second electrode 114, and an explosion-proof valve 115. The areas of

sides

1103 and 1104 are smaller and the areas of

sides

1105 and 1106 are larger. The top surface 1101 of the battery cell 110 together forms the first heat-conducting surface 111 of the battery cell assembly 11, and the bottom surface 1102 of the battery cell 110 together forms the second heat-conducting surface 112 of the battery cell assembly 11.

In the examples provided herein, a direction perpendicular to the side 1105 (or side 1106) is defined as the thickness direction of the cell 110. The sides with larger areas (such as the side 1105 or the side 1106) between two adjacent cells 110 are attached to each other, so that a larger contact area is provided between the two adjacent cells 110. When an extrusion acting force exists between two adjacent battery cells 110, the deformation of the two adjacent battery cells 110 can be effectively prevented, and the structural strength and the safety of the battery cell assembly 1112 are guaranteed. The top surface 1101 of the battery cell 110 is attached to the first heat exchange plate 12, and the bottom surface 1102 of the battery cell 110 is attached to the second heat exchange plate 13, so that a heat dissipation path perpendicular to the battery cell assembly 11 can be formed, and the temperature uniformity of each battery cell 110 is guaranteed. In addition, when the cell 110 undergoes expansion deformation, the areas of the side faces 1105 and 1106 are larger, and the areas of the top face 1101 and the bottom face 1102 are smaller; therefore, the expansion force generated by the top surface 1101 and the bottom surface 1102 is smaller than the expansion force generated by the side surface 1105 and the side surface 1106, so that the extrusion of the battery cell 110 to the first heat exchange plate 12 and the second heat exchange plate 13 is reduced, which is beneficial to ensuring the structural stability and reliability of the first heat exchange plate 12 and the second heat exchange plate 13.

Of course, in other examples, a direction perpendicular to the side 1103 (or the side 1104) may be defined as a thickness direction of the battery cell 110, which is not described herein.

In addition, as shown in fig. 4, in order to make the first grooves 122 better provide corresponding spaces for the electrodes of the cell assembly 11, in the example provided in the present application, the first plate surface 121 has a plurality of first grooves 122. After the first heat exchange plate 12 and the cell assembly 11 are assembled in place, a portion of the first grooves 122 in the first heat exchange plate 12 are all located in the first straight line L1, so that the first electrodes 113 located in the first straight line L1 can be located in the first grooves 122. Another portion of the first grooves 122 are located in the second straight line L2, so that the second electrodes 114 located in the second straight line L2 can be located in the first grooves 122.

In practical applications, the different cells 110 need to be connected in series or parallel, so in the examples provided in the present application, the electrodes of two adjacent cells 110 may be disposed in the same first recess 122, so as to facilitate connection between the electrodes of two cells 110.

Specifically, as shown in fig. 6, in one example provided herein,

adjacent cells

110a and 110b are taken as examples. The first electrode 113a of the cell 110a and the first electrode 113b of the cell 110b are all located in the same first recess 122. In addition, the tab 14 is further provided in the first groove 122, and one end of the tab 14 is connected to the first electrode 113a and the other end is connected to the first electrode 113b, so that electrical connection between the first electrode 113a and the first electrode 113b can be achieved.

In addition, in a specific application, sufficient gaps can be kept between the first electrode 113a of the battery cell 110a and the first electrode 113b of the battery cell 110b and the inner wall of the first groove 122, so as to prevent interference between the first heat exchange plate 12 and the first electrode 113a and the first electrode 113b, and effectively ensure the safety of the battery pack 10. In addition, a sufficient gap may be maintained between the tab 14 and the inner wall of the first groove 122 to prevent interference between the first heat exchange plate 12 and the tab 14.

During long-term use of the battery pack, some of the battery cells 110 may expand, deform or displace. When there is a sufficient gap between the electrode (e.g., the first electrode 113 or the second electrode 114) of the battery cell 110 or the tab 14 and the inner wall of the first recess 122, the reliability of the battery pack 10 in long-term use can be ensured. Additionally, in some examples, a thermally conductive paste may also be filled within the first groove 122. The heat-conducting glue may fill the gap between the electrode of the battery cell 110 and the inner wall of the first groove 122, so as to ensure structural stability and heat conductivity between the electrode and the first heat exchange plate 12. The heat in the electrode can be effectively transferred to the first heat exchange plate 12 through the heat conductive paste, and thus, the electrode can be prevented from generating a defect such as a high temperature. Accordingly, the heat-conductive adhesive may fill the gap between the tab 14 and the inner wall of the first groove 122 to ensure structural stability and heat conductivity between the tab 14 and the first heat exchange plate 12. The heat in the tab 14 can be effectively transferred to the first heat exchange plate 12 through the heat conductive adhesive, and thus, the occurrence of defects such as high temperature of the tab 14 can be prevented. In addition, in the concrete implementation, the heat-conducting glue can be made of a material with better connection strength, so that the first heat exchange plate 12 and the battery cell assembly 11 can be fixedly connected, and further, the first heat exchange plate 12 and the battery cell assembly 11 can be fixedly connected without using other connection structures.

In a specific arrangement, the distance between the electrode (e.g., the first electrode 113 or the second electrode 114) and the inner wall of the first recess 122 is greater than or equal to 1mm. So that a sufficient gap between the electrode and the inner wall of the first recess 122 can be ensured without significantly affecting the compactness between the different components of the battery pack 10. Accordingly, the distance between the tab 14 and the inner wall of the first recess 122 is greater than or equal to 1mm. So that a sufficient gap between the tabs 14 and the inner wall of the first recess 122 can be ensured without, in addition, significantly affecting the compactness between the different components of the battery pack 10.

When specifically provided, the tab 14 may be a sheet-like structure made of copper, aluminum, and their alloys. The specific material and shape of the tab 14 is not limited herein.

In addition, as shown in fig. 7 and 8, in one example provided herein, the first plate surface 121 further has a second groove 123 and a communication groove 124, one end of the communication groove 124 communicates with the first groove 122, and the other end communicates with the second groove 123.

In a specific application, a voltage detecting device or a temperature detecting device may be configured in the battery pack 10, so as to effectively detect parameters such as voltage or temperature of each battery cell 110. The voltage detection device or the temperature detection device may be disposed at the top surface 1101 of the battery cell 110 and connected to an external battery management system (battery management system, BMS) through a wire harness so that the collected voltage signal or temperature signal may be transmitted to the battery management system. Wherein, the second groove 123 and the communication groove 124 may provide an effective penetration space for the wire harness.

As shown in fig. 8, in a specific arrangement, the second grooves 123 may be located in a third straight line L3 between the two rows of first grooves 122. Wherein the first straight line L1, the second straight line L2 and the third straight line L3 are all parallel to each other. In addition, the second groove 123 may also communicate with the explosion-proof valve 115 of the battery cell 110, and the gas leaked through the explosion-proof valve 115 may be discharged to the outside through the second groove 123. In particular embodiments, the explosion-proof valve 115 of the cell 110 may be located between the first electrode 113 and the second electrode 114 of the cell 110, and the second groove 123 may be located between two rows of the first grooves 122, so that the second groove 123 may face the explosion-proof valve 115 of the cell 110, thereby enabling communication between the second groove 123 and the explosion-proof valve 115.

As shown in fig. 8, one end of the second groove 123 may have a ventilation hole 125, and the ventilation hole 125 may extend to the side of the first heat exchange plate 12. When some of the battery cells 110 in the battery pack 10 generate a thermal runaway or other adverse condition, the generated high-temperature gas may burst the explosion-proof valve 115, and the gas discharged through the explosion-proof valve 115 may be discharged to the second groove 123 and discharged to the outside through the vent holes 125 of the second groove 123. Secondary damage to the battery cell 110 can be effectively avoided or reduced.

In practical application, the shape and size of the second groove 123 may be flexibly set according to practical requirements, which will not be described herein.

In addition, in the specific arrangement, the liquid inlet 126 and the liquid outlet 127 of the first heat exchange plate 12 may be located on the same side of the first heat exchange plate 12 or may be located on different sides of the first heat exchange plate 12.

For example, as shown in fig. 8, in an example provided in the present application, the liquid inlet 126 and the liquid outlet 127 of the first heat exchange plate 12 may be located on the same side (e.g., the left side in fig. 8) of the first heat exchange plate 12. The medium may flow from the inlet 126 into the flow channels in the first heat exchanger plate 12 and out the outlet 127. When the medium circulates in the flow channel in the first heat exchange plate 12, the medium exchanges heat with the first heat exchange plate 12, so that the first heat exchange plate 12 can be cooled or heated, and the heat of the battery cell assembly 11 can be effectively controlled.

When specifically provided, the first heat exchange plate 12 may be a unitary structure or may be assembled from a plurality of component structures.

For example, as shown in fig. 9, in one example provided herein, is comprised of two components. That is, the first heat exchange plate 12 includes a first plate body 12a and a second plate body 12b bonded in the thickness direction. The first plate surface 121 is located in the first plate body 12a, and the flow channel of the first heat exchange plate 12 is located in the second plate body 12b. Specifically, the flow channel structure may be located in the second plate 12b, and the first groove 122, the second groove 123, and the communication groove 124 may be located in the first plate 12a. When manufacturing, the first plate body 12a and the second plate body 12b can be respectively molded, so that the flow channel, the first groove 122, the second groove 123 and the communication groove 124 can be respectively manufactured by adopting proper processes, the convenience in manufacturing can be effectively improved, and the manufacturing cost and the process difficulty can be reduced. After the molded first plate body 12a and second plate body 12b are manufactured and molded, the first plate body 12a and the second plate body 12b may be assembled by adopting a welding or bonding process, and finally, the preparation of the first heat exchange plate 12 is completed.

In addition, the type of construction of the second heat exchanger plate 13 may also be varied in specific applications.

For example, as shown in fig. 10, in one example provided in the present application, the second heat exchange plate 13 is a rectangular plate-like structure having a flow passage inside. The liquid inlet (not shown in fig. 10) and the liquid outlet (not shown in fig. 10) of the second heat exchanger plate 13 may be located at the same side of the second heat exchanger plate 13. The medium can flow into the flow channel in the second heat exchanger plate 13 from the liquid inlet and flow out from the liquid outlet. When the medium circulates in the flow channel in the second heat exchange plate 13, the medium exchanges heat with the second heat exchange plate 13, so that the second heat exchange plate 13 can be cooled or heated, and the heat of the battery cell assembly 11 can be effectively controlled.

Referring to fig. 3 and 10 in combination, the second heat exchange plate 13 has a surrounding frame 132, and the surrounding frame 132 is located on the second plate surface 131 and surrounds the battery cell assembly 11. Specifically, the enclosure 132 has a certain height dimension and surrounds four sides of the cell assembly 11.

When the electric core assembly 11 and the second heat exchange plate 13 are assembled, the electric core assembly 11 can be aligned to the area surrounded by the surrounding frame 132, so that the position accuracy between the electric core assembly 11 and the second heat exchange plate 13 is guaranteed. Wherein, a certain gap can be arranged between the surrounding frame 132 and the side surface of the battery cell assembly 11. Alternatively, the inner wall of the peripheral frame 132 may be bonded to the side surface of the cell module 11.

The cell assembly 11 and the second heat exchange plate 13 can be in heat conduction contact and fixed connection through heat conduction glue. The heat-conducting glue can be coated on the second plate surface 131, and then the second heat-conducting surface 112 of the battery cell assembly 11 is attached towards the second plate surface 131, so that the heat-conducting glue is fully distributed in the gap between the second plate surface 131 and the second heat-conducting surface 112.

In addition, under the effect of the surrounding frame 132, the overflowing heat-conducting glue can also be effectively blocked, and the overflowing heat-conducting glue is prevented from polluting the outer surface of the second heat exchange plate 13.

In practical applications, the battery pack 10 may further include a plurality of battery cell assemblies 11, a first heat exchange plate 12 and a second heat exchange plate 13. Specifically, in the battery pack 10 shown in fig. 2, there is a battery pack 10 unit composed of one cell assembly 11, a first heat exchange plate 12, and a second heat exchange plate 13. In other examples, two, three, or more battery pack 10 units may be included, and a plurality of battery pack 10 units may be sequentially disposed along the first direction or may be sequentially disposed along the second direction.

The number and the position layout of the battery pack 10 units included in the battery pack 10 can be flexibly selected and adjusted according to actual demands. In addition, the number of the battery cells 110 included in each battery cell assembly 11 may be set reasonably according to actual requirements, which is not limited in the present application.

In practice, the battery pack 10 may be used in home energy storage, industrial energy storage, data center, vehicle, etc. scenarios for storing and releasing electrical energy.

For example, as shown in fig. 11, embodiments of the present application also provide an energy storage system that may include an inverter and a battery pack 10. The inverter is electrically connected to the battery pack 10 to convert the alternating current into the direct current and supply the direct current to the battery pack 10, or to convert the direct current from the battery pack 10 into the alternating current.

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.

Alternatively, as shown in fig. 12, there is also provided a power station in an embodiment of the present application, which may include a power generation device and a battery pack. The power generation device is electrically connected with the battery pack and is used for storing generated electric energy into the battery pack. By applying the battery pack, the safety and the deployment difficulty of the power station can be effectively improved.

The power generation device may be a photovoltaic power generation device, a wind power generation device, or the like, as the specific application, the specific type of the power generation device is not limited in this application. In addition, in practical application, the power generation equipment and the battery pack can be connected through the power distribution cabinet. The power distribution cabinet can comprise a direct current-alternating current conversion device or a transformer and the like, so that electric energy generated by the power generation equipment can be effectively transmitted to a battery pack for storage. In the specific setting, the quantity and the type of the devices in the power distribution cabinet can be reasonably set according to actual demands, and the application is not limited in this way.

Alternatively, as shown in fig. 13, there is also provided a charging network in the embodiment of the present application, including a charging post 20 and a battery pack. The charging post 20 is electrically connected to the battery pack through a cable, and the battery pack can supply the charging post 20 with electric energy stored in itself. The charging stake 20 has a connector 21, and the connector 21 is connectable to a powered device (e.g., a vehicle) so as to supplement energy to the powered device. By applying the battery pack, the safety of the charging network can be effectively improved, and the flexibility of the charging network in deployment can be improved.

When specifically arranged, the charging network can comprise a plurality of battery packs and a plurality of charging piles 20, and each battery pack can provide electric energy for the plurality of charging piles, so that the flexibility of deployment can be effectively improved.

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 battery pack is characterized by comprising a battery cell assembly, a first heat exchange plate and a second heat exchange plate;

the battery cell assembly is provided with a first heat conducting surface and a second heat conducting surface which are opposite, and electrodes of the battery cell assembly are positioned on the first heat conducting surface;

the first heat exchange plate is provided with a first plate surface, the first plate surface is provided with a first groove, the first plate surface is in heat conduction contact with the first heat conduction surface, and the electrode is positioned in the first groove;

the second heat exchange plate is provided with a second plate surface, and the second plate surface is in heat conduction contact with the bottom surface.

2. The battery pack of claim 1, wherein the cell assembly comprises a plurality of cells, and the plurality of cells are disposed sequentially along a first direction;

the electrodes of each battery cell comprise a first electrode and a second electrode, the first electrodes of the battery cells are all positioned in a first straight line, the second electrodes of the battery cells are all positioned in a second straight line, and the first straight line, the second straight line and the first direction are parallel;

the first plate surface is provided with a plurality of first grooves, one part of the first grooves are all positioned in the first straight line, and the other part of the first grooves are all positioned in the second straight line.

3. The battery pack according to claim 1 or 2, wherein a distance between the electrode and an inner wall of the first recess is greater than or equal to 1mm.

4. The battery pack of claim 3, wherein a thermally conductive adhesive is provided between the electrode and the inner wall of the first recess.

5. The battery pack of any one of claims 1 to 4, further comprising a tab connected between electrodes of adjacent two of the cells, and the tab is located within the first recess.

6. The battery pack of claim 5, wherein a distance between the tab and an inner wall of the first recess is greater than or equal to 1mm.

7. The battery pack according to any one of claims 2 to 6, wherein the first plate surface further has a second groove and a communication groove;

one end of the communication groove is communicated with the first groove, and the other end of the communication groove is communicated with the second groove.

8. The battery pack of claim 7, wherein the second groove is located in a third line, the first line, the second line, and the third line are parallel, and the third line is located between the first line and the second line.

9. The battery pack according to any one of claims 1 to 8, wherein the first heat exchange plate includes a first plate body and a second plate body that are laminated in a thickness direction;

the first plate surface is positioned in the first plate body, and the runner of the first heat exchange plate is positioned in the second plate body.

10. The battery pack of any one of claims 1 to 9, wherein the second heat exchange plate has a peripheral frame located on the second plate face and surrounding the cell assembly.

11. An energy storage system comprising an inverter and a battery pack according to any one of claims 1 to 10, the inverter being electrically connected to the battery pack for converting ac power to dc power and providing the dc power to the battery pack, or converting dc power from the battery pack to ac power.

12. A power station comprising a power generation device and a battery pack according to any one of claims 1 to 10, the power generation device being electrically connected to the battery pack, the power generation device being for storing generated electrical energy into the battery pack.

13. A charging network comprising a charging post and a battery pack according to any one of claims 1 to 10, the charging post being electrically connected to the battery pack, the battery pack being for providing electrical energy to the charging post.