CN116315259A - A battery pack, energy storage system, power station and charging network - Google Patents

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

A battery pack, energy storage system, power station and charging network

technical field

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

Background technique

With the continuous development and wide application of clean energy, batteries have been widely used in various types of energy storage devices. During the charging and discharging process of the battery cell, a certain amount of heat will be generated, and with the continuous increase of the charging power or discharging power, the heat generated by the battery cell will also increase significantly. Therefore, the heat dissipation performance of the battery cell has a great influence on the charging and discharging power. has a significant impact.

In the current solution, the battery core is usually cooled by one-sided cooling. For example, the bottom surface or the side surface of the cell can be in thermal contact with the cold plate. However, the heat dissipation effect of this method is poor, and the temperature difference between different regions of the battery cell will be large, which will reduce the temperature uniformity of the battery cell.

Contents of the invention

The present application provides a battery pack, an energy storage system, a power station and a charging network with better heat dissipation effect and improved temperature uniformity.

In a first aspect, the present application provides a battery pack, which may include a battery cell assembly, a first heat exchange plate, and a second heat exchange plate. The electric core assembly has a first heat conduction surface and a second heat conduction surface facing away from each other, and the electrodes of the electric core assembly are located on the first heat conduction surface. The first heat exchange plate has a first plate surface, the first plate surface has a first groove, the first plate surface is in thermal contact with the first heat conduction surface, and the electrodes are located in the first groove. The second heat exchange plate has a second plate surface, and the second plate surface is in thermal contact with the bottom surface. Heat exchange can be performed between the cell assembly and the first heat exchange plate through the heat conduction contact between the first heat conduction surface and the first plate surface, so that the first heat exchange plate cools down or heats the cell assembly. The first groove can provide sufficient accommodating space for the electrodes, so as to prevent the electrodes from hindering the heat conduction contact between the first heat conduction surface and the second plate surface. In addition, the first heat exchange plate can also provide effective protection for the electrodes and related components connected to the electrodes, which is beneficial to improving the safety of the battery pack. The second heat exchange plate has a second plate surface, and the second plate surface is in thermal contact with the bottom surface. Heat exchange can be performed between the cell assembly and the second heat exchange plate through the heat conduction contact between the second heat conduction surface and the second plate surface, so that the second heat exchange plate cools down or heats the cell assembly.

In the battery pack provided in the present application, the cell assembly, the first heat exchange plate and the second heat exchange plate may form a sandwich structure. It is beneficial to reduce the temperature difference between different areas of the battery cell, thereby improving the temperature uniformity of the battery cell and helping to ensure the service life of the battery pack. In addition, each battery cell in the battery cell assembly can dissipate heat through the first heat exchange plate and the second heat exchange plate, which can effectively improve the cooling effect. The running cost is suitable for high magnification scenes.

In an example, the cell assembly includes a plurality of cells, and the cells are sequentially arranged along the first direction. The electrodes of each cell include a first electrode and a second electrode, the first electrodes of the plurality of cells are located near the first straight line, the second electrodes of the plurality of cells are located near the second straight line, and the first The straight line, the second straight line and the first direction are parallel; the first board surface has a plurality of first grooves, some of the first grooves are located near the first straight line, and the other part of the first grooves are located near the second straight line. Wherein, the position and shape of the first groove can be reasonably set according to the position of the electrodes in the battery cell and the connection requirements between different electrodes, so as to have better flexibility.

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

In an example, the first board surface may also have a second groove and a communication groove. One end of the communication groove communicates with the first groove, and the other end communicates with the second groove. The second groove and the communication groove can provide an effective passing space for the wire harness connected to the first groove, which is beneficial to ensure the actual use requirements of the battery pack.

In a specific setting, the second groove may be elongated, and may be located in the third straight line. Wherein, 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.

Wherein, the explosion-proof valve of the battery cell can be located between the first electrode and the second electrode of the battery cell, and the second groove is located between two rows of first grooves, so the second groove can be directly opposite to the explosion-proof valve of the battery cell , so that 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, which is beneficial to ensure the safety of the battery pack.

In a specific arrangement, the distance between the electrode and the inner wall of the first groove may be greater than or equal to 1 mm. Therefore, a sufficient gap between the electrodes and the inner wall of the first groove can be ensured, and the compactness of different components of the battery pack will not be significantly affected.

The distance between the bar piece and the inner wall of the first groove may be greater than or equal to 1 mm. Therefore, a sufficient gap between the tab and the inner wall of the first groove can be ensured, and the compactness of different components of the battery pack will not be significantly affected.

In an example, there may be thermally conductive glue between the electrode and the inner wall of the first groove. The thermally conductive glue can be filled in the gap between the electrode of the cell and the inner wall of the first groove, so as to ensure the structural stability and thermal conductivity between the electrode and the first heat exchange plate. The heat in the electrode can be effectively transferred to the first heat exchange plate through the thermally conductive glue, and the heat in the bar can be effectively transferred to the first heat exchange plate through the thermally conductive glue. Therefore, it can also prevent the electrodes and the bar from generating high temperature and other defects. Condition.

In one example, the first heat exchange plate includes a first plate body and a second plate body bonded along the thickness direction, the first plate surface is located on the first plate body, and the flow channel of the first heat exchange plate is located on the second plate body. in vivo. During production, the first plate body and the second plate body can be formed separately, so that the flow channel, the first groove, the second groove and the connecting groove can be separately produced by using appropriate processes, which can effectively improve the production The convenience of time is conducive to reducing the production cost and process difficulty.

In an example, the second heat exchange plate has a surrounding frame, and the surrounding frame is located on the second plate surface and surrounds the cell assembly. The surrounding frame can improve the positional accuracy between the cell assembly and the second heat exchange plate; in addition, when the thermal conductive glue is filled between the second plate surface and the second heat exchange surface, the surrounding frame can effectively prevent the thermal conductive glue from overflowing, and can Guarantee the quality of the battery pack.

In a second aspect, the present application also provides an energy storage system, including an inverter and any battery pack described above. The inverter is electrically connected to the battery pack, and is used to convert the alternating current into direct current and supply it to the battery pack, or convert the direct current from the battery pack into alternating current. By applying the above-mentioned battery pack, the heat dissipation performance and temperature uniformity of the energy storage system can be effectively improved, which is conducive to ensuring the reliability and safety of the energy storage system.

In a third aspect, the present application also provides a power station, including power generation equipment and any battery pack described above. The power generation equipment is electrically connected with the battery pack, and the power generation equipment is used to store the generated electric energy in the battery pack. By applying the above-mentioned battery pack, the heat dissipation performance and temperature uniformity of the energy storage system can be effectively improved, which is conducive to ensuring the reliability and safety of the energy storage system.

In a fourth aspect, the present application also provides a charging network, including a charging pile and any battery pack described above. The charging pile is electrically connected to the battery pack, and the battery pack is used to provide electric energy to the charging pile, so as to supplement energy for the powered equipment. By applying the above-mentioned battery pack, the heat dissipation performance and temperature uniformity of the energy storage system can be effectively improved, which is conducive to ensuring the reliability and safety of the energy storage system.

Description of drawings

FIG. 1 is a schematic side view of a conventional battery pack provided by the present application;

FIG. 2 is a schematic diagram of a three-dimensional structure of a battery pack provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of an exploded structure of a battery pack provided in an embodiment of the present application;

Fig. 4 is a schematic diagram of another exploded structure of a battery pack provided by the embodiment of the present application;

FIG. 5 is a schematic diagram of a three-dimensional structure of a cell provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of a partial cross-sectional structure of a battery pack provided by an embodiment of the present application;

Fig. 7 is a schematic diagram of a three-dimensional structure of a first heat exchange plate provided in an embodiment of the present application;

Fig. 8 is a schematic plan view of a first heat exchange plate provided in an embodiment of the present application;

Fig. 9 is a schematic perspective view of another first heat exchange plate provided in the embodiment of the present application;

Fig. 10 is a schematic perspective view of a second heat exchange plate provided in an embodiment of the present application;

Fig. 11 is a structural block diagram of an energy storage system provided by an embodiment of the present application;

FIG. 12 is a structural block diagram of a power station provided in an embodiment of the present application;

Fig. 13 is a schematic structural diagram of a charging network provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings.

In order to facilitate the understanding of the battery pack provided in the embodiment of the present application, its application scenario is firstly introduced below.

The battery pack provided by the embodiment of the present application can be used in home energy storage, industrial energy storage, data centers, vehicles and other scenarios to store and release electric energy.

In practical applications, in order to enable the battery pack to store sufficient electric energy, the battery pack may generally include a plurality of battery cells. In order to reduce the size of the battery pack, the location layout of multiple cells will be relatively compact. During the charging and discharging process of the battery cell, heat will be generated. In order to avoid excessive temperature, a heat dissipation structure may be provided in the battery pack.

The current heat dissipation structure is generally divided into two types: air cooling and liquid cooling. Among them, the heat dissipation structure of the air cooling method mainly relies on the circulation of air flow to take away the heat on the surface of the battery core, so as to achieve the purpose of heat dissipation. The heat dissipation structure of the liquid cooling method mainly relies on the circulation of the medium (such as water or oil) to take away the heat from the surface of the battery core, so as to achieve the purpose of heat dissipation. Since the heat dissipation structure of the liquid cooling method has higher heat dissipation efficiency and occupies a smaller volume, it is gradually widely used in the industry.

However, there are still many deficiencies in the heat dissipation structure of the current liquid cooling method.

For example, as shown in Figure 1, in the current battery pack 01 that adopts liquid cooling, it generally includes a heat exchange plate 011 and a plurality of battery cells 012, and the multiple battery cells 012 are arranged in sequence, and the bottom surface of each battery cell 012 Both are in thermal contact with the heat exchange plate 011 , so that the heat exchange plate 011 can cool down the battery cell 012 . However, the vertical size of the battery cell 012 is large, and the heat at the top of the battery cell 012 cannot be efficiently transferred to the bottom, which will cause a large temperature difference between the upper and lower sides of the battery cell 012, which is beneficial to ensure the temperature uniformity of the battery cell 012 itself , will affect the working reliability and service life of the battery pack 01.

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

In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The terms used in the following examples are for the purpose of describing particular examples only, and are not intended to limit the application. As used in the specification and appended claims of this application, the singular expressions "a", "an" and "the" are intended to also include expressions such as "one or more" unless The contrary is expressly indicated in its context. 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 to "one embodiment" or the like in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment", "in some embodiments", "in other embodiments", etc. in various places in this specification are not necessarily all referring to the same embodiment, but rather means "one or more but not all embodiments" unless specifically emphasized otherwise. The terms "including", "having" and their variations all mean "including but not limited to", unless specifically stated otherwise.

As shown in FIG. 2 , in an example provided in the present application, a 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 assembled between the first heat exchange plate 12 assembly and the second heat exchange plate 13 , so that the entire battery pack 10 can form a sandwich structure. As shown in Figure 3 and Figure 4, the cell assembly 11 has a first heat conduction surface 111 and a second heat conduction surface 112 facing away from each other, and the electrodes of the cell assembly 11 are located on the first heat conduction surface 111; the first heat exchange plate 12 There is a first plate surface 121 , the first plate surface 121 has a first groove 122 , the first plate surface 121 is in thermal contact with the first heat conduction surface 111 , and the electrodes are located in the first groove 122 . The heat exchange between the cell assembly 11 and the first heat exchange plate 12 can be performed through the heat conduction contact between the first heat transfer surface 111 and the first plate surface 121 , so that the first heat exchange plate 12 can cool down the temperature of the cell assembly 11 or heat. The first groove 122 can provide sufficient accommodating space for the electrodes, so as to prevent the electrodes from obstructing the 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 also provide effective protection for the electrodes and related components connected to the electrodes, 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 thermal contact with the bottom surface. The heat exchange between the cell assembly 11 and the second heat exchange plate 13 can be performed through the heat conduction contact between the second heat transfer surface 112 and the second plate surface 131 , so that the second heat exchange plate 13 can cool down the temperature of the cell assembly 11 or heat.

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 perform heat exchange with the first heat conduction surface 111 of the battery cell assembly 11, and the second heat exchange plate 13 can perform heat exchange with the second heat conduction surface 112 of the battery cell assembly 11, which is beneficial to reduce the battery cell 110. The temperature difference between different regions can improve the temperature uniformity of the battery cell 110 , which is beneficial to ensure the service life of the battery pack 10 . In addition, each battery cell 110 in the battery cell assembly 11 can dissipate heat through the first heat exchange plate 12 and the second heat exchange plate 13, which can effectively improve the cooling effect. Therefore, the battery pack 10 has a lower demand for cooling capacity. , can reduce the operating cost of the battery pack 10, and is suitable for high-magnification scenarios.

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 multiple battery cells 110 are arranged in sequence 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 the first straight line L1, and the second electrodes 114 of the plurality of cells 110 are located Within the second straight line L2 , the first straight line L1 and the second straight line L2 are parallel to the first direction, wherein the first direction is the thickness direction of the battery cell 110 . Both the first straight line L1 and the second straight line L2 are roughly straight lines. In practical applications, the positions of the plurality of first electrodes 113 are all located on roughly the same straight line; correspondingly, the positions of the plurality of second electrodes 114 are located on roughly the same straight line.

It should be noted that in practical applications, the first electrode 113 and the second electrode 114 defined above are for the convenience of distinguishing and describing the polarity of the battery cell 110, the first electrode 113 can be positive or negative, the second The second electrode 114 can be positive or negative. That is to say, it may be that the positive poles of all the battery cells 110 are located in the first straight line L1, and the negative poles of the battery cells 110 are all located in the second straight line. It may also be that the negative poles of all the battery cells 110 are located in the first straight line, and the positive poles of the battery cells 110 are all located in the second straight line L2. It may also be that the negative poles of some battery cells 110 are located in the first straight line L1, the positive poles of some other battery cells 110 are located in the first straight line L1, the negative poles of some battery cells 110 are located in the second straight line L2, and the positive poles of some other battery cells 110 are located in the second straight line L2, and the positive poles of some other battery cells 110 The positive pole of is located in the second straight line L2.

In actual application, the locations of the positive and negative electrodes of different battery cells 110 can be reasonably adjusted according to the series-parallel connection requirements of the battery cells 110 in the battery cell assembly 11 , which is not limited in this application.

In addition, it should be noted that the aforementioned thickness direction of the battery cell 110 refers to a direction perpendicular to one side surface of the battery cell 110 . In practical application, the thickness direction of the battery cell 110 can be reasonably set according to the shape and size of the battery.

For example, as shown in FIG. 5 , in a cell 110 provided by the present application, the cell 110 has a rectangular block structure with a top surface 1101 , a bottom surface 1102 , a side surface 1103 , a side surface 1104 , a side surface 1105 and a side surface. 1106. Wherein, the top surface 1101 has a first electrode 113 , a second electrode 114 and an explosion-proof valve 115 . Side 1103 and side 1104 have smaller areas, and side 1105 and side 1106 have larger areas. Wherein, 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 example provided in this application, the direction perpendicular to the side surface 1105 (or side surface 1106 ) is defined as the thickness direction of the battery cell 110 . The sides with larger areas (such as the side 1105 or the side 1106 ) between two adjacent battery cells 110 are attached to each other, so that there is a larger contact area between the two adjacent battery cells 110 . When there is a pressing force between two adjacent battery cells 110 , it can effectively prevent the two adjacent battery cells 110 from being deformed, which is beneficial to ensure the structural strength and safety of the battery cell assembly 1112 . The top surface 1101 of the battery cell 110 is bonded to the first heat exchange plate 12, and the bottom surface 1102 of the battery cell 110 is bonded to the second heat exchange plate 13, so that a heat dissipation path perpendicular to the battery cell assembly 11 can be formed, which is beneficial to ensure that each The temperature uniformity of each cell 110. In addition, when the cell 110 expands and deforms, the areas of the side surfaces 1105 and 1106 are larger, and the areas of the top surface 1101 and the bottom surface 1102 are smaller; The expansion force generated by the side surface 1106 will reduce the extrusion of the battery cell 110 on the first heat exchange plate 12 and the second heat exchange plate 13, which is beneficial to ensure the structural stability of the first heat exchange plate 12 and the second heat exchange plate 13 sex and reliability.

Of course, in other examples, the direction perpendicular to the side surface 1103 (or the side surface 1104 ) may also be defined as the thickness direction of the battery cell 110 , which will not be repeated here.

In addition, as shown in FIG. 4 , in order to enable the first groove 122 to better provide a corresponding space for the electrodes of the cell assembly 11 , in the example provided in this application, the first board surface 121 has a plurality of first concaves. Slot 122. After the first heat exchange plate 12 and the cell assembly 11 are assembled in place, a part 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 grooves 122 located in the first straight line L1 The electrodes 113 can all be located in the first groove 122 . Another part of the first groove 122 is 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 groove 122 .

In practical applications, different battery cells 110 need to be connected in series or in parallel, therefore, in the example provided in this application, the electrodes of two adjacent battery cells 110 can be arranged in the same first groove 122 , so as to realize the connection between the electrodes of the two battery cells 110 .

Specifically, as shown in FIG. 6 , in an example provided in the present application, an adjacent battery cell 110 a and a battery cell 110 b are taken as an example. Both the first electrode 113a of the cell 110a and the first electrode 113b of the cell 110b are located in the same first groove 122 . In addition, there is also a bar piece 14 in the first groove 122, one end of the bar piece 14 is connected to the first electrode 113a, and the other end is connected to the first electrode 113b, so that the connection between the first electrode 113a and the first electrode 113b can be realized. electrical connection.

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

During the long-term use of the battery pack, some battery cells 110 may experience expansion, deformation or displacement. When there is a sufficient gap between the electrodes (such as the first electrode 113 or the second electrode 114) of the battery cell 110 or the inner wall of the pad 14 and the first groove 122, the reliability of the battery pack 10 in long-term use can be ensured. . In addition, in some examples, thermal conductive glue may also be filled in the first groove 122 . Wherein, the thermal conductive glue can be filled in the gap between the electrode of the battery cell 110 and the inner wall of the first groove 122 to ensure the structural stability and thermal conductivity between the electrode and the first heat exchange plate 12 . The heat in the electrodes can be effectively transferred to the first heat exchange plate 12 through the heat-conducting glue, so it can also prevent the electrodes from generating high temperature and other adverse conditions. Correspondingly, the thermal conductive glue can be filled in the gap between the bar piece 14 and the inner wall of the first groove 122 to ensure the structural stability and thermal conductivity between the bar piece 14 and the first heat exchange plate 12 . The heat in the bar piece 14 can be effectively transferred to the first heat exchange plate 12 through the heat-conducting glue, therefore, it can also prevent the bar piece 14 from generating high temperature and other adverse conditions. In addition, in actual implementation, the heat-conducting adhesive can be made of a material with better connection strength, which can realize the fixed connection between the first heat exchange plate 12 and the battery cell assembly 11, thereby avoiding the use of other connection structures to realize the first heat exchange plate 12. The fixed connection between the thermal plate 12 and the cell assembly 11 .

In a specific arrangement, the distance between the electrodes (such as the first electrode 113 or the second electrode 114 ) and the inner wall of the first groove 122 is greater than or equal to 1 mm. Therefore, a sufficient gap between the electrodes and the inner wall of the first groove 122 can be ensured, and the compactness of different components of the battery pack 10 will not be significantly affected. Correspondingly, the distance between the pad 14 and the inner wall of the first groove 122 is greater than or equal to 1 mm. Therefore, a sufficient gap between the tab 14 and the inner wall of the first groove 122 can be ensured, and the compactness of different components of the battery pack 10 will not be significantly affected.

In a specific setting, the bar piece 14 may be a sheet-like structure made of copper, aluminum and alloy materials thereof. Wherein, the present application does not limit the specific material and shape of the pad 14 .

In addition, as shown in FIGS. 7 and 8 , in an example provided by the present application, the first plate surface 121 also has a second groove 123 and a communication groove 124 , and 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 detection device or a temperature detection device, etc. 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 temperature detection device can be arranged on the top surface 1101 of the cell 110, and is connected to an external battery management system (battery management system, BMS) through a wire harness, so that the collected voltage signal or temperature signal can be transmitted to the battery management system. system. Wherein, the second groove 123 and the communication groove 124 can provide an effective passing space for the wire harness.

As shown in FIG. 8 , in a specific setting, the second groove 123 may be located in a third straight line L3 between 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 can also communicate with the explosion-proof valve 115 of the battery cell 110 , and the gas leaked through the explosion-proof valve 115 can be discharged to the outside through the second groove 123 . In a specific implementation, the explosion-proof valve 115 of the battery cell 110 can be located between the first electrode 113 and the second electrode 114 of the battery cell 110, and the second groove 123 is located between two rows of first grooves 122. Therefore, the second The groove 123 can face the explosion-proof valve 115 of the cell 110 , so that the communication between the second groove 123 and the explosion-proof valve 115 can be realized.

As shown in FIG. 8 , one end of the second groove 123 may have a vent hole 125 , and the vent hole 125 may extend to the side of the first heat exchange plate 12 . When some battery cells 110 in the battery pack 10 have adverse conditions such as thermal runaway, the generated high-temperature gas can break through the explosion-proof valve 115, and the gas leaked through the explosion-proof valve 115 can be discharged to the second groove 123, and then pass through the second groove. The vent hole 125 of the groove 123 discharges to the outside. The secondary damage caused by the battery cell 110 can be effectively avoided or reduced.

In actual application, the shape and size of the second groove 123 can be flexibly set according to actual needs, which will not be repeated here.

In addition, in 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 by 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 of the first heat exchange plate 12 (as shown in FIG. 8 to the left of the ). The medium can flow into the channel in the first heat exchange plate 12 through the liquid inlet 126 and flow out through the liquid outlet 127 . When the medium circulates in the flow channel in the first heat exchange plate 12, it will exchange heat with the first heat exchange plate 12, so that the temperature of the first heat exchange plate 12 can be cooled or heated, so that the heat of the battery cell assembly 11 can be effective control.

In a specific arrangement, the first heat exchange plate 12 may be an integral structure or may be assembled from a plurality of component structures.

For example, as shown in FIG. 9 , in an example provided in this application, it is composed of two components. That is, the first heat exchange plate 12 includes a first plate body 12a and a second plate body 12b bonded along 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 above-mentioned flow channel structure may be located in the second plate body 12b, and the above-mentioned first groove 122, second groove 123 and communication groove 124 may all be located in the first plate body 12a. During fabrication, the first plate body 12a and the second plate body 12b can be formed separately, so that the runners, the first groove 122, the second groove 123, and the communication groove 124 can be fabricated separately using appropriate processes. , can effectively improve the convenience of production, and help reduce the production cost and process difficulty. After the formed first plate body 12a and second plate body 12b are formed, the first plate body 12a and the second plate body 12b can be assembled by welding or bonding to finally complete the first heat exchange plate 12 preparation.

In addition, in specific applications, the structure types of the second heat exchange plate 13 may also be various.

For example, as shown in FIG. 10 , in an example provided in the present application, the second heat exchange plate 13 is a rectangular plate structure with flow channels inside. The liquid inlet (not shown in FIG. 10 ) and the liquid outlet (not shown in FIG. 10 ) of the second heat exchange plate 13 may be located on the same side of the second heat exchange plate 13 . The medium can flow into the channel in the second heat exchange 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, it will exchange heat with the second heat exchange plate 13, so that the temperature of the second heat exchange plate 13 can be cooled or heated, so that the heat of the cell assembly 11 can be effective control.

Please refer to FIG. 3 and FIG. 10 , the second heat exchange plate 13 has a surrounding frame 132 located on the second plate surface 131 and enclosing the cell assembly 11 . Specifically, the surrounding frame 132 has a certain height and surrounds four sides of the cell assembly 11 .

When assembling the cell assembly 11 and the second heat exchange plate 13, the cell assembly 11 can be aligned in the area surrounded by the frame 132, which helps to ensure that the cell assembly 11 and the second heat exchange plate 13 The positional accuracy between. Wherein, there may be a certain gap between the surrounding frame 132 and the side of the cell assembly 11 . Alternatively, the inner wall of the surrounding frame 132 may also be bonded to the side of the cell assembly 11 .

Wherein, heat conduction contact and fixed connection can be realized between the cell assembly 11 and the second heat exchange plate 13 through heat conduction glue. Thermally conductive glue can be coated on the second plate surface 131, and then the second heat conducting surface 112 of the cell assembly 11 is attached to the second plate surface 131, so that the thermally conductive glue is fully covered with the second plate surface 131 and the second heat conducting surface 131. In the gap between the faces 112.

In addition, under the action of the surrounding frame 132 , it can also effectively block the overflowing heat-conducting glue, preventing the overflowing heat-conducting glue from polluting the outer surface of the second heat exchange plate 13 .

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

The quantity and location layout of the cells of the battery pack 10 contained in the battery pack 10 can be flexibly selected and adjusted according to actual needs. In addition, the number of battery cells 110 included in each battery cell assembly 11 can also be reasonably set according to actual needs, which is not limited in this application.

In practical applications, the battery pack 10 can be used in household energy storage, industrial energy storage, data centers, vehicles and other scenarios for storing and releasing electric energy.

For example, as shown in FIG. 11 , the embodiment of the present application also provides an energy storage system, which may include an inverter and a battery pack 10 . The inverter is electrically connected to the battery pack 10, and is used to convert AC power into DC power and provide it to the battery pack 10, or convert DC power from the battery pack 10 into AC power.

In addition, the energy storage system can also include a battery management system. The battery management system can effectively detect parameters such as the temperature, state of charge, and health status of the battery pack, and can also effectively monitor the charging and discharging functions of the battery pack. control, so as to ensure the normal operation of energy storage equipment.

Alternatively, as shown in FIG. 12 , an embodiment of the present application further provides a power station, which may include a power generation device and a battery pack. The power generation equipment is electrically connected with the battery pack, and the power generation equipment is used to store the generated electric energy in the battery pack. By applying the above-mentioned battery pack, the safety and deployment difficulty of the power station can be effectively improved.

In a specific application, the power generation equipment may be photovoltaic power generation equipment, wind energy power generation equipment, etc., and this application does not limit the specific type of power generation equipment. In addition, in practical applications, power generation equipment and battery packs can also be connected through a power distribution cabinet. The power distribution cabinet may include DC-AC conversion devices, or may also include devices such as transformers, so as to effectively transmit the electric energy generated by the power generation equipment to the battery pack for storage. In specific settings, the number and types of devices in the power distribution cabinet can be reasonably set according to actual needs, which is not limited in this application.

Alternatively, as shown in FIG. 13 , the embodiment of the present application also provides a charging network, including a charging pile 20 and a battery pack. The charging pile 20 is electrically connected to the battery pack through a cable, and the battery pack can provide the electric energy stored by itself to the charging pile 20 . The charging pile 20 has a connector 21, and the connector 21 can be connected with a power receiving device (such as a vehicle), so as to supplement energy to the power receiving device. By applying the above-mentioned battery pack, the security of the charging network can be effectively improved, and it can also help to improve the flexibility of the charging network during deployment.

In specific settings, the charging network may include multiple battery packs and multiple charging piles 20, and each battery pack may provide power to multiple charging piles, thereby effectively improving deployment flexibility.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the application, and should cover Within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (13)

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.

Images