Battery pack and energy storage system

Abstract

According to the battery pack provided by the invention, the heat balance of the battery pack can be improved. A battery case; the battery cell assembly comprises a plurality of battery cells, and the plurality of battery cells are positioned in the battery shell; the power module is positioned on one side of the battery shell; and the heat management assembly is located between the battery cell assembly and the power module, and the heat management assembly comprises at least one of a heat dissipation component and a heat storage component.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a battery pack and an energy storage system. BACKGROUND

[0002] The battery pack comprises a shell and a cell assembly located inside the shell, the cell assembly comprises a plurality of cells, and the cells are usually arranged in an array inside the shell. Some battery packs further comprise a DC / DC module, and in the related technical solution, the DC / DC module is arranged at the end of the battery pack. The temperature control effect of the cell assembly of such a battery pack is not good. SUMMARY

[0003] The present application aims to provide a battery pack and an energy storage system, which are beneficial to inhibit the temperature rise rate of the battery pack and improve the temperature control effect.

[0004] The battery pack provided by the present application comprises:

[0005] a battery shell;

[0006] a cell assembly, the cell assembly comprising a plurality of cells, and the plurality of cells being located inside the battery shell;

[0007] a power module, the power module being located at one side of the battery shell;

[0008] a thermal management assembly, the thermal management assembly being located between the cell assembly and the power module, and the thermal management assembly comprising at least one of a heat dissipation component and a heat storage component.

[0009] In one way, the thermal management assembly comprises the heat storage component and the heat dissipation component, and the heat storage component is located between the cell assembly and the heat dissipation component; or the thermal management assembly comprises the heat dissipation component and a heat conduction component, and the heat conduction component is located between the cell assembly and the heat dissipation component.

[0010] In one way, the heat dissipation component comprises at least one heat dissipation channel, and the heat dissipation channel is used for flowing cooling medium.

[0011] In one way, the heat dissipation component comprises a first plate body and a second plate body arranged oppositely, and a plurality of third plate bodies, the third plate bodies being located between the first plate body and the second plate body, and adjacent two third plate bodies and the first plate body and the second plate body enclose one heat dissipation channel.

[0012] In one aspect, the thermal management assembly comprises the heat storage component and the heat dissipation component, the heat storage component comprises a heat storage material, and the heat dissipation component comprises a first plate body; the thermal management assembly further comprises a flange located at an edge portion of the first plate body, the flange extends towards the battery housing, and the flange and the first plate body enclose a containing space, and the heat storage material is filled in the containing space.

[0013] In one aspect, the thermal management assembly comprises a through hole, the through hole penetrates through the thermal management assembly along a distribution direction of the power module and the cell assembly, and the through hole and the heat dissipation channel are isolated from each other.

[0014] In one aspect, one housing side of the battery housing is a first housing side, and the power module is located at one side of the first housing side; the battery housing comprises a second housing side adjacent to the first housing side; and there is a gap between the cell and the second housing side.

[0015] The power module comprises an electrical connector, the first housing side is provided with an opening, and the electrical connector is inserted into the opening and located in the gap to be electrically connected with the cell.

[0016] In one aspect, the same side of the plurality of cells of the cell assembly is arranged opposite to the thermal management assembly.

[0017] In one aspect, the cell comprises a plurality of sides, the plurality of sides of the cell comprises two oppositely arranged large faces, and a pair of first narrow faces and a pair of second narrow faces; and the plurality of cells are arranged with the large faces opposite to each other.

[0018] The first narrow faces of the same side of the plurality of cells are arranged opposite to the thermal management assembly, or the second narrow faces of the same side of the plurality of cells are arranged opposite to the thermal management assembly.

[0019] In one aspect, the area of the housing side of the battery housing opposite to the power module is not less than the area of any other housing side of the battery housing.

[0020] The application further provides an energy storage system comprising a plurality of the battery pack as described in any one of the above aspects, the plurality of battery packs are arranged in a stacked manner, and the power modules of two adjacent battery packs are connected to each other through splicing or a connector.

[0021] In one aspect, the thermal management assembly of the plurality of battery packs comprises the heat dissipation component, the heat dissipation component comprises a heat dissipation channel, and the heat dissipation channels of adjacent battery packs are communicated with each other.

[0022] In this application's technical solution, a thermal management component is provided between the battery cell assembly and the power module. The thermal management component's heat storage component stores heat, and its heat dissipation component dissipates heat. Therefore, due to the presence of the thermal management component, it can perform thermal management on the side of the battery cell assembly closest to the power module, allowing heat on this side to be stored and dissipated. This controls the temperature rise rate of the battery cell assembly, improves its temperature control effect, and thus ensures its performance and extends its lifespan. Furthermore, thermal management on the side closest to the power module ensures a relatively balanced thermal environment for the battery cell assembly, promoting overall thermal equilibrium and further improving its performance.

[0023] This application also provides an energy storage system comprising multiple battery packs as described in any of the above claims. The battery packs are stacked, and the power modules of adjacent battery packs are plugged into each other or connected via connectors. The energy storage system has the same technical effects as the aforementioned battery packs; moreover, the connection is more convenient as the power modules of adjacent battery packs are plugged into each other or connected via connectors. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the battery pack structure in the first embodiment of this application;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the battery pack viewed in section AA;

[0026] Figure 3 for Figure 2 Enlarged diagram of part B in the middle;

[0027] Figure 4 for Figure 2 A schematic diagram of the structure of the battery cell;

[0028] Figure 5 This is a cross-sectional view of the battery pack along its XZ plane in the first embodiment of this application;

[0029] Figure 6 This is a schematic diagram of the battery pack structure in the second embodiment of this application;

[0030] Figure 7 for Figure 6 Enlarged schematic diagram of part C in the middle;

[0031] Figure 8 for Figure 6 Top view;

[0032] Figure 9 for Figure 6 Schematic diagram of the heat dissipation component;

[0033] Figure 10 for Figure 9 Top view of the heat dissipation component;

[0034] Figure 11 for Figure 9 Front view of the heat dissipation component;

[0035] Figure 12 for Figure 9 Left view of the heat dissipation component;

[0036] Figure 13 for Figure 9 Enlarged view of part D in the middle;

[0037] Figure 14 This is a top view of the battery pack in the third embodiment of this application;

[0038] Figure 15 for Figure 14 Enlarged schematic diagram of part E in the middle;

[0039] Figure 16 This is a top view of the battery pack in the fourth embodiment of this application;

[0040] Figure 17 This is a top view of the battery pack in the fifth embodiment of this application;

[0041] Figure 18 for Figure 1 A schematic diagram of the battery pack after the power module has been removed, showing the battery cells inside the battery pack;

[0042] Figure 19 This is a schematic diagram showing the distribution of another type of battery cell assembly and power module;

[0043] Figure 20 This is a schematic diagram of the battery pack structure in the sixth embodiment of this application.

[0044] The annotations in the attached figures are explained as follows:

[0045] 100 battery pack;

[0046] 10 Battery casing; 101 First casing side; 1011 Annular frame; 1012 Opening; 102 Second casing side; 1021 Second rib; 103 Third casing side; 1031 First rib; 104 Fourth casing side; 105 Fifth casing side; 106 Sixth casing side;

[0047] 20 Power Module; 201 Flanged Edge; 202 Electrical Connector;

[0048] 30 cell assembly; 301 cell; 3011 first narrow face; 3012 second narrow face; 3013 large face; 3014 terminal post; 30a side of the first assembly; 30b side of the second assembly;

[0049] 40 Thermal management component; 401 Thermal conductive component; 402 Heat dissipation component; 4021 First plate; 4022 Second plate; 4023 Third plate; 402a Heat dissipation channel; 403 Heat storage component; 404 Flanged edge; 40a Through hole. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the battery pack 100 in the first embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the structure of the battery pack 100 in cross section along direction AA; Figure 3 for Figure 2 Enlarged diagram of part B in the middle; Figure 4 for Figure 2 A schematic diagram of the structure of the Zhongdianxin 301.

[0052] The battery pack 100 in this embodiment includes a battery housing 10, a cell assembly 30, and a power module 20. The cell assembly 30 includes multiple cells 301, which means at least two cells 301. The battery housing 10 defines an inner cavity, and the multiple cells 301 are located inside the battery housing 10. The power module 20 is located on one side of the battery housing 10, and the arrangement direction of the power module 20 and the battery housing 10 is defined as a first direction X.

[0053] The battery housing 10 has multiple housing sides, which enclose an inner cavity of the battery housing 10. Figure 1 In this embodiment, the battery casing 10 is a cuboid, and thus has six casing sides. The battery casing 10 can be defined as having length, width, and height. In this embodiment, the width direction is also the first direction X mentioned above; specifically, in this embodiment, the power module 20 is located on one side of the battery casing 10 in the width direction. The length direction can be defined as the second direction Y, and the height direction can be defined as the third direction Z. The six casing sides include three pairs of oppositely arranged casing sides: one pair distributed along the first direction X, one pair distributed along the second direction Y, and one pair distributed along the third direction Z. The cuboid shape is merely one specific structural form of the battery casing 10, but the battery casing 10 is not limited to a cuboid; for example, it can also be a cube, or the battery casing 10 may not be a regular shape, depending on actual needs.

[0054] In this embodiment, multiple battery cells 301 are arranged along the second direction Y, that is, the battery cell assembly 30 includes only one row of battery cells 301, arranged in a straight line. The power module 20 is located on the outside of the battery housing 10. In this embodiment, "outer side" and "inner side" are used with reference to the inner cavity defined by the battery housing 10. The side closer to the inner cavity of the battery housing 10 is the inner side, and the opposite side is the outer side.

[0055] like Figure 1 As shown, the power module 20 is located on one side of the battery housing 10. One side of the battery housing 10 is defined as the first housing side 101. The power module 20 is located on one side of the first housing side 101, that is, on the outside of the first housing side 101.

[0056] In this embodiment, the battery casing 10 has a cuboid structure. The relatively regular shape of the battery casing 10 facilitates the installation of multiple battery cells 301 with the same regular shape inside the cavity. Figure 4 The battery cell 301 shown is also a cuboid structure, including six sides. The battery cell 301 is a relatively thin cuboid structure. In this embodiment, each side of the battery cell 301 can be defined. The two opposite sides with the largest area are the large surfaces 3013 of the battery cell 301. The remaining sides surround the two large surfaces 3013, and the remaining sides are defined as narrow surfaces. Each pair of narrow surfaces is a second narrow surface 3012, and one of the second narrow surfaces 3012 is provided with a terminal post 3014. Figure 4 From this perspective, the top surface of the pole post 3014 is set as a second narrow surface 3012, the bottom surface is set as another second narrow surface 3012, and the other pair of narrow surfaces of the cell 301 are the first narrow surface 3011.

[0057] Please look again. Figure 5 , Figure 5 This is a cross-sectional view of the battery pack 100 along its XZ plane in the first embodiment of this application.

[0058] The battery pack 100 in this embodiment further includes a thermal management component 40, which includes at least one of a heat dissipation component 402 and a heat storage component 403, and can have at least one function of heat dissipation and heat storage. The thermal management component 40 is located between the same side of the plurality of battery cells 301 (specifically the first narrow surface 3011 of the battery cell 301) and the power module 20. In this embodiment, the first housing side 101 is provided with an opening 1012 (shown in...). Figure 18Therefore, the thermal management component 40 is directly disposed between the sides of the plurality of battery cells 301 and the power module 20, and part of the thermal management component 40 may also be located within the opening 1012. In some embodiments, the first housing side 101 may not have an opening 1012, in which case the thermal management component 40 may be disposed between the sides of the plurality of battery cells 301 and the first housing side 101, or disposed between the sides of the plurality of battery cells 301 and the power module 20.

[0059] Since the power module 20 of the battery pack 100 is a heat-generating structure, the side of the battery cell assembly 30 closest to the power module 20 will be exposed to a higher heat environment compared to other parts of the battery cell assembly 30. A thermal management component 40 is installed on this side of the battery cell assembly 30. The heat storage component 403 of the thermal management component 40 can store the heat generated by the battery cell assembly 30 and the power module 20, while the heat dissipation component 402 can dissipate the heat. This allows the heat on the side of the battery cell assembly 30 closest to the power module 20 to be better dissipated and stored, thereby increasing the temperature control capability on this side, suppressing the temperature rise rate on this side of the battery cell assembly 30, improving the temperature control effect of the battery cell assembly 30, and thus ensuring the performance and extending the service life of the battery cell assembly 30. Furthermore, thermal management on the side closest to the power module 20 allows the battery cell assembly 30 to be in a relatively balanced thermal environment, which is beneficial for the overall heat balance of the battery cell assembly 30, further ensuring its performance and extending its service life.

[0060] In addition, when the battery cell assembly 30 is in a low-temperature environment, such as when it is in a low-temperature start-up state, the heat stored in the heat storage component 403 can also be transferred to the battery cell assembly 30, which helps to improve the performance of the battery cell assembly 30 in a low-temperature environment.

[0061] As described above, the battery cell 301 includes multiple sides. In a specific embodiment, the same side of the multiple battery cells 301 is disposed opposite to the first housing side 101 and the thermal management assembly 40 along the first direction X. Figure 2 In the battery cell assembly 30, the first narrow facet 3011 of all the cells 301 face towards the first housing side 101, which is located between the power module 20 and all the first narrow facets 3011. When the shape of the battery housing 10 is irregular or non-cubic or non-rectangular, the first housing side 101 can also be understood as the portion of the battery housing 10 that is opposite to the sides of the multiple cells 301 along the first direction X.

[0062] Multiple battery cells 301 and power modules 20 can be defined opposite sides to form the first component side 30a of the battery cell assembly 30 (shown in...). Figure 5 , 18In this embodiment, the first component side 30a of the battery cell assembly 30 and the thermal management component 40 are arranged opposite each other along the first direction X. The thermal management component 40 and the power module 20 are also arranged opposite each other along the first direction X. This means the thermal management component 40 can perform thermal management on the entire first component side 30a of the battery cell assembly 30, ensuring that the side of each battery cell 301 closest to the power module 20 is in a relatively balanced thermal environment. Since the thermal environment of the same side of each battery cell 301 is consistent, the heat of the first component side 30a is balanced. In other words, the thermal management component 40 not only ensures relatively balanced heat in the first direction X of the battery cell assembly 30, but also relatively balanced heat across the entire first component side 30a. In related technologies, the power module is located at the end of the battery pack casing and is arranged opposite one or more battery cells. Clearly, in this embodiment, the arrangement of all battery cells 301 opposite to the thermal management component 40 is more conducive to the heat balance of the entire battery cell assembly 30.

[0063] In this embodiment, the first component side 30a and the thermal management component 40 are positioned opposite each other. This means that, when projected along the first direction X, the projections of the first component side 30a and the thermal management component 40 can completely overlap or substantially overlap. For example, in a few cases, the edge portions of the projections of the first component side 30a and the thermal management component 40 may not overlap. However, the projections of the side of each cell 301 closest to the power module 20 and the thermal management component 40 will inevitably overlap. When the projections overlap, the thermal management component 40 provides better thermal management and temperature rise control.

[0064] The thermal management component 40 may include at least one of a heat dissipation component 402 and a heat storage component 403. The heat dissipation component 402 includes a heat dissipation channel 402a, which extends in a direction perpendicular to the first direction X. In this embodiment, it extends in the second direction Z. A cooling medium flows in the heat dissipation channel 402a, which can remove the heat from the battery cell assembly 30 through heat exchange. The heat storage component 403 can store the heat dissipated by the battery cell assembly 30 and the power module 20, which can also reduce the mutual transfer of heat between the battery cell 301 and the power module 20 and control the temperature rise.

[0065] like Figure 5As shown, in some embodiments, the thermal management component 40 may include a heat dissipation component 402, which includes a heat dissipation channel 402a, and may also be equipped with a heat conduction component 401. Specifically, the heat conduction component 401 may contact the side of multiple battery cells 301. The heat conduction component 401 may be, for example, a thermal pad or thermal adhesive, and its thermal conductivity may be greater than or equal to 0.2 W / m·K to achieve a better heat conduction effect. The heat-conducting component 401 can enhance the heat dissipation of the first component side 30a of the battery cell assembly 30. As mentioned earlier, the first component side 30a of the battery cell assembly 30 is closer to the power module 20, which generates heat during operation, compared to other locations. By placing the heat-conducting component 401 at the location of the first component side 30a, the heat generated by the battery cell 301 itself can be better dissipated from the location of the first component side 30a, thereby reducing the temperature difference between the first component side 30a and other locations due to its relatively high temperature environment. For example, it can reduce the temperature difference with the second component side 30b, which is the side furthest from the power module 20. The second component side 30b and the first component side 30a are the two sides of the battery cell assembly 30 distributed along the first direction X. Figure 5 As shown. It can be seen that the thermal management component 40 in this embodiment includes a heat-conducting component 401, which can reduce the overall temperature difference of the battery cell assembly 30 and help improve the overall heat balance of the battery cell assembly 30.

[0066] also, Figure 5 The heat dissipation component 402 of the thermal management component 40 is located outside the heat conduction component 401, that is, the heat dissipation component 402 is located between the heat conduction component 401 and the power module 20. After the heat is conducted out from the heat conduction component 401, it can directly or indirectly exchange heat with the cooling medium in the heat dissipation channel 402a, which is beneficial to improving the overall thermal balance of the battery cell assembly 30. The cooling medium is, for example, a cooling airflow, which can be air. When both the battery cell assembly 30 and the power module 20 generate heat, the air in the heat dissipation channel 402a is heated. Under the chimney effect, the air rises, thereby achieving natural convection heat exchange in the heat dissipation channel 402a. The cooling airflow can also be an airflow with a lower temperature after exchanging heat with a lower temperature medium, etc. Of course, when the cooling medium is introduced into the heat dissipation channel 402a, the heat dissipation channel 402a and the inner cavity of the battery casing 10 need to be isolated from each other to maintain the airtightness of the inner cavity of the battery casing 10.

[0067] In a specific embodiment, an energy storage system may also be provided, including multiple battery packs 100 stacked along the third direction Z. In this case, the heat dissipation channels 402a of two adjacent battery packs 100 can be interconnected, and the heat dissipation channels 402a of multiple battery packs 100 can be interconnected. The cooling airflow can simultaneously cool and dissipate heat from multiple heat dissipation channels 402a, thereby improving the thermal balance of the cell components 30 of the entire energy storage system.

[0068] Figure 5 In this configuration, the thermal management component 40 includes both a heat-conducting component 401 and a heat-dissipating component 402, which allows for better heat dissipation of the battery cell assembly 30. It is understood that the thermal management component 40 can also dissipate heat from the power module 20. That is, the power module 20 can exchange heat with the medium within the heat dissipation channel 402a to remove heat from the power module 20. Consequently, the transfer of heat from the power module 20 to the battery cell assembly 30 can be reduced, thus minimizing the impact of the power module 20's heat on the thermal environment of the battery cell assembly 30.

[0069] In some embodiments, the heat dissipation component 402 may also be provided separately. For example... Figures 6 to 11 understand, Figure 6 This is a schematic diagram of the structure of the battery pack 100 in the second embodiment of this application; Figure 7 for Figure 6 Enlarged schematic diagram of part C in the middle; Figure 8 for Figure 6 Top view; Figure 9 for Figure 6 Schematic diagram of the structure of the heat dissipation component 402; Figure 10 for Figure 9 Top view of the heat dissipation component 402; Figure 11 for Figure 9 Front view of heat dissipation component 402; Figure 12 for Figure 9 Left view of the heat dissipation component 402.

[0070] In this embodiment, the thermal management component 40 includes a heat dissipation component 402, such as... Figure 9 As shown, the heat dissipation component 402 includes a first plate 4021 and a second plate 4022 distributed along a first direction X, and a plurality of third plates 4023 extending along the first direction X. The plurality of third plates 4023 are arranged along a second direction Y. The first plate 4021 and the second plate 4022 are approximately parallel to the YZ plane, and the third plates 4023 are approximately parallel to the XZ plane. Two adjacent third plates 4023, the first plate 4021, and the second plate 4022 enclose a heat dissipation channel 402a. Figure 10 The diagram illustrates multiple heat dissipation channels 402a distributed along the second direction Y. The arrangement of the multiple heat dissipation channels 402a facilitates the uniform dissipation of heat. The multiple heat dissipation channels 402a can be evenly distributed along the second direction Y, which is consistent with the arrangement direction of the multiple battery cells 301, thus further facilitating the heat dissipation of the multiple battery cells 301.

[0071] Can be combined Figure 13 understand, Figure 13 for Figure 9 Enlarged view of part D in the middle.

[0072] The thermal management component 40 may include a via 40a, which extends along a first direction X through the first plate 4021 and the second plate 4022. The via 40a and the heat dissipation channel 402a are isolated from each other. The power module 20 includes an electrical connector that passes through the via 40a to electrically connect to the battery cell assembly 30. Specifically, the thermal management component 40 is provided with a via 40a that avoids the electrical connector, facilitating the connection of the electrical connector. The via 40a and the heat dissipation channel 402a are isolated from each other, reducing heat transfer between the power module 20 and the battery cell assembly 30 through the via 40a. Figure 13 As shown, the via 40a includes two ports distributed along the first direction X. The outer peripheral wall of the via 40a and the heat dissipation channel 402a are isolated from each other. The outer peripheral wall of the via 40a can also be a third plate 4023.

[0073] In some embodiments, the thermal management component 40 may further include a heat storage component 403. For example... Figure 14 and Figure 15 As shown, Figure 14 This is a top view of the battery pack 100 in the third embodiment of this application; Figure 15 for Figure 14 Enlarged diagram of part E in the middle.

[0074] In this embodiment, the heat storage component 403 of the thermal management component 40 is located between the battery cell assembly 30 and the power module 20. The heat storage component 403 may include heat storage materials, such as liquid or solid heat storage materials, to achieve better heat storage and facilitate the diffusion of heat from the power module 20 and the battery cell assembly 30 into the heat storage component 403 for storage, thereby reducing the heat influence between them.

[0075] Specifically, in this embodiment, the thermal management component 40 simultaneously includes a heat dissipation component 402 and a heat storage component 403 located between the heat dissipation component 402 and the battery cell assembly 30. The heat storage component 403 and the battery cell assembly 30 can be in contact, and heat can be stored in the heat storage component 403. Excess heat can be dissipated through the heat dissipation component 402, thereby improving the heat dissipation effect.

[0076] The heat storage component 403 may include a heat storage material. The thermal management component 40 may also include a flange 404 located at the edge of the first plate 4021. The flange 404 extends towards the battery casing 10, specifically along the first direction X. The flange 404 and the first plate 4021 enclose a receiving space, into which the heat storage material of the heat storage component 403 can be filled. That is, the first plate 4021 of the heat dissipation component 402 can be provided with a flange 404 to receive the heat storage material, resulting in a simple structure. In other embodiments, the heat storage component 403 may also have a separate receiving structure to receive the heat storage material.

[0077] Additionally, in some embodiments, the thermal management component 40 may also include a heat storage component 403 separately, without the heat dissipation component 402. For example... Figure 16 As shown, Figure 16 This is a top view of the battery pack 100 in the fourth embodiment of this application. The heat storage component 403 is located directly between the cell assembly 30 and the power module 20. The heat from the cell assembly 30 or the power module 20 can be stored in the heat storage component 403. When there is a lot of heat, the heat storage component 403 can also dissipate heat to the outside from all sides.

[0078] Let's look again. Figure 17 , Figure 17 This is a top view of the battery pack 100 in the fifth embodiment of this application.

[0079] This embodiment is similar in structure to the battery pack 100 in the third embodiment, with the thermal management component 40 including both a heat storage component 403 and a heat dissipation component 402. However, in the fifth embodiment, the heat storage component 403 does not cover the entire opposite side of the cell assembly 30 and the power module 20. Figure 17 In this configuration, the length of the heat storage component 403 in the second direction Y is less than the length of the battery cell assembly 30. The heat storage component 403 can be arranged opposite to some of the battery cells 301 along the first direction X, which can enhance the heat storage of some of the battery cells 301. The length of the heat dissipation component 402 in the second direction Y is approximately equal to that of the battery cell assembly 30. That is, the design can be based on the actual heat distribution of the battery cell assembly 30. The thermal environment on the same side of multiple battery cells 301 in the battery cell assembly 30 may not be consistent. The heat storage component 403 can be arranged between the battery cell 301 with more heat and the heat dissipation component 402. Similarly, the heat conduction component 401 can be arranged in the same way to make the heat distribution on the entire first component side 30a of the battery cell assembly 30 more even. In other words, the heat dissipation capacity of the thermal management component 40 can be set to be inconsistent in the arrangement direction (second direction Y) of the battery cells 301.

[0080] You can continue to refer to this. Figure 2 and combined Figure 18 understand, Figure 18 for Figure 1 A schematic diagram of the structure of the battery pack 100 after the power module 20 is removed, showing the battery cell 301 inside the battery pack 100.

[0081] Multiple battery cells 301 are arranged along a second direction Y, which is perpendicular to the large surface 3013 of the battery cell 301. That is, the multiple battery cells 301 are arranged with their large surfaces 3013 facing each other. The second direction Y is parallel to the x-direction of the battery cell 301. At this time, a first narrow surface 3011 of the battery cell 301 and a first housing side portion 101 are opposite each other along the first direction X. This arrangement facilitates a more compact arrangement of the battery cells 301 within the battery housing 10, and makes it easier for the power module 20 to be arranged opposite the sides of the multiple battery cells 301.

[0082] In some embodiments, the plurality of cells 301 may also be arranged in a narrow-faced arrangement, such as... Figure 19 As shown, Figure 19 This is a schematic diagram showing the distribution of another battery cell assembly 30 and power module 20. A thermal management component 40 is provided between the battery cell assembly 30 and the power module 20. The thermal management component 40 can be the structure described in any of the above embodiments.

[0083] At this time, the large surface 3013 of multiple battery cells 301 and the power module 20 are arranged opposite each other. With the same number of battery cells 301, the arrangement of the battery cells 301 with the large surface 3013 opposite each other makes the structure relatively compact. The area of ​​the side 30a of the first component composed of multiple first narrow surfaces 3011 is relatively small, and the arrangement area of ​​the thermal management component 40 is also relatively small, which is conducive to controlling costs.

[0084] You can continue to refer to this. Figure 18 The power module 20 can be connected to the first housing side 101, as the power module 20 is located on the outside of the first housing side 101, making assembly simpler. In other embodiments, the power module 20 can also be connected to other locations on the battery housing 10.

[0085] The power module 20 and the first housing side 101 can be directly connected or indirectly connected, such as... Figure 3 As shown, the power module 20 is directly connected to the side 101 of the first housing, as... Figure 6 , 7 As shown, the power module 20 can also be connected to the thermal management component 40, and then connected to the first housing side 101 via the thermal management component 40. Specifically, the first plate 4021 of the heat dissipation component 402 is connected to the first housing side 101, and the second plate 4022 is connected to the power module 20. The thermal management component 40 and the power module 20 can also be an integrated structure; for example, the second plate 4022 and the power module 20 can be integrally formed, and the first plate 4021 and the first housing side 101 can also be integrally formed.

[0086] like Figure 18As shown, in this embodiment, the first housing side 101 is provided with an opening 1012, which extends through the first housing side 101 both inside and out. Figure 18 The battery pack 100 in the current configuration does not have the power module 20 installed. At this time, the opening 1012 exposes the first narrow surface 3011 of the battery cell 301 inside the battery housing 10, meaning the first narrow surface 3011 is observable. After the power module 20 is installed, it can directly or indirectly seal the opening 1012 to meet the sealing requirements of the battery housing 10 of the battery pack 100. For example, after the power module 20 and the first housing side 101 are fitted together, the inner cavity of the battery housing 10 forms a sealed cavity with a sealing level of not less than IPX5. Providing the opening 1012 on the first housing side 101 facilitates the electrical connection between the power module 20 and the internal battery cell 301, and also facilitates heat dissipation of the internal battery cell 301, for example, allowing the heat from the battery cell 301 to be quickly carried away by the heat dissipation component 402.

[0087] Specifically, such as Figure 18 As shown, the first housing side portion 101 is not entirely an opening 1012. The first housing side portion 101 includes an annular frame 1011 surrounding the opening 1012, that is, the opening 1012 is defined by the annular frame 1011. The area S1 of the opening 1012 is smaller than the overall area S of the first housing side portion 101. The area S of the first housing side portion 101 is the sum of the area S1 of the opening 1012 and the area S2 of the annular frame 1011. The area of ​​the first housing side portion 101 mentioned here is the area of ​​the projection plane along a direction perpendicular to the first housing side portion 101 (i.e., the first direction X), and the area of ​​the annular frame 1011 is also the area of ​​the projection plane along this direction. The annular frame 1011 facilitates direct or indirect connection and fixation between the thermal management component 40 and the side portion 101 of the first housing. For example, the annular frame 1011 can have connection holes. The thermal management component 40 can be connected to the annular frame 1011 using fasteners such as screws or rivets, or it can be detachably fixed to the annular frame 1011 using other methods, such as snap-fit, to facilitate the assembly and disassembly of the thermal management component 40 and the power module 20. The connection holes can be filled with sealant or the screws can carry gaskets to meet the sealing requirements. Of course, when the thickness of the annular frame 1011 meets the requirements, the connection holes can also be set as blind holes.

[0088] Figure 3 In the middle, the housing of the power module 20 can be provided with a flange 201 to facilitate connection with the annular frame 1011, making the connection simple and reliable.

[0089] The power module 20 includes a circuit board (not shown) and electronic components (not shown) mounted on the circuit board. The power module 20 may also include a housing. The circuit board and electronic components of the power module 20 can be housed within the housing. Specifically, the power module 20 can be a DC / DC (Direct Current / Direct Current) module or an AC / DC (Alternating Current / Direct Current) module, etc., that performs power conversion. The power module 20 may also integrate other functions, such as temperature detection and fire detection units for the battery cell 301. The housing of the power module 20 can, for example, abut against the annular frame 1011 for connection, or abut against the thermal management component 40 for connection.

[0090] The other side of the battery housing 10 is defined as the second housing side 102. The second housing side 102 is adjacent to the first housing side 101, as follows: Figure 1 As shown, the second housing side 102 is specifically a housing side portion disposed opposite to the terminal post 3014 of the battery cell 301. The second housing side 102 is perpendicular to the Z-direction and can be... Figure 1 The top of the battery casing 10 is shown. In this embodiment, there is a gap d between the terminal post 3014 of the cell 301 and the second casing side 102 (shown in the figure). Figure 5 The power module 20 includes an electrical connector 202, which may be a connecting copper busbar. The electrical connector 202 can be inserted into the interior of the battery casing 10 through the opening 1012 and positioned in the gap, thereby electrically connecting with the terminal 3014 of the battery cell 301. With this configuration, the electrical connection between the power module 20 and the battery casing 10 can be achieved simply by plugging in the electrical connector 202 and the battery cell 301, making the connection convenient. The electrical connection described in this embodiment can be a power connection or a signal connection.

[0091] In some embodiments, the area of ​​the first housing side 101 is not less than the area of ​​any other housing side, that is, the first housing side 101 is the housing side with the largest area. Figure 1 One of the two shell sides distributed along the first direction X is the first shell side 101. Of course, if the battery shell 10 is a cube, then any shell side of the battery shell 10 can be the first shell side 101. This embodiment does not limit the specific shape of the battery shell 10.

[0092] In this embodiment, the power module 20 of the battery pack 100 is located on the outside of the first housing side 101, and the power module 20 includes a circuit board and electronic components. Therefore, the power module 20 generates a relatively large amount of heat. As mentioned earlier, the first housing side 101 is the housing side with the largest area of ​​the battery housing 10. With this arrangement, the area of ​​the circuit board of the power module 20 can be set to be relatively large. The area of ​​the circuit board is the projected area along the thickness direction of the circuit board. Specifically, ... Figure 1 For example, the thickness direction of the circuit board is the first direction X. For instance, the area of ​​the circuit board and the area of ​​the first housing side 101 can be roughly the same. Therefore, the power module 20 has a larger heat dissipation area, better heat dissipation effect, and the arrangement and connection of electronic devices are easier to achieve.

[0093] In some embodiments, the power module 20 may consist of only one circuit board. As mentioned above, the first housing side 101 has the largest area, so the power module 20 can be configured to have a relatively large area, and the circuit board can also have a larger area, thereby allowing all the necessary electronic components to be placed on a single circuit board. In related technical solutions, the power module is located on the side of the battery pack housing with a relatively smaller area. In order to arrange the electronic components, the circuit board of the power module is configured with two or three layers, or even more layers. This approach makes the assembly of the power module 20 inconvenient, as the electronic components need to be arranged and connected separately, resulting in a relatively complex structure. In contrast, in this embodiment, the power module 20 is located on the side of the battery housing 10 with the largest area. The power module 20 has a relatively large area, and only one circuit board needs to be set, resulting in a simpler structure and more convenient assembly.

[0094] like Figure 1 , 2 As shown in Figure 18, the battery casing 10 includes a fourth casing side 104 opposite to the first casing side 101, both distributed along the first direction X. It also includes a third casing side 103 and a fifth casing side 105 distributed along the second direction Y, and a second casing side 102 and a sixth casing side 106 distributed along the third direction Z. The large surface 3013 of the battery cell 301 has a large expansion amount. The battery cells 301 are stacked with their large surfaces 3013 facing each other. One of the third casing side 103 and the fifth casing side 105 distributed along the second direction Y can be a detachable end plate, thereby pressing against the battery cell 301 along the first direction X to apply a reliable preload and control the deformation of the battery cell assembly 30. As can be seen, in this embodiment, the battery pack 100 is arranged in a direction perpendicular to the large surface 3013 so that a pre-tightening force can be applied after assembly to control deformation. The power module 20 is arranged on one side corresponding to multiple narrow surfaces, so that the thermal management component 40 corresponds to all the first narrow surfaces 3011 on the same side of the cell assembly 30, thereby improving the thermal balance of the cell assembly 30 when there is a heat source such as the power module 20 around the battery housing 10.

[0095] At this point, at least one of the third shell side 103 and the fifth shell side 105 can be configured with a first rib 1031 to improve structural strength. Figure 18 In the middle, the first ribs 1031 of the third shell side 103 are arranged in a crisscross pattern.

[0096] In this embodiment, the second housing side 102 of the battery housing 10 can also be configured as a removable cover to facilitate the installation of the battery cell 301. Of course, the battery cell 301 can also be installed along the second direction Y. The second housing side 102 can also be provided with second ribs 1021 to improve structural strength. The second ribs 1021 can also be arranged in a crisscross pattern.

[0097] In some embodiments, the fourth housing side 104, which is opposite to the first housing side 101, may also be provided with a heat dissipation structure, such as heat dissipation fins, to improve the heat dissipation capacity of the battery pack 100.

[0098] The battery cell assembly 30 mentioned in the above embodiment includes a row of battery cells 301. The first narrow facet 3011 of all battery cells 301 is disposed opposite to the first housing side 101, and all battery cells 301 are arranged along the second direction Y, which is a single-row battery cell structure. The battery pack 100 may also have other arrangements.

[0099] Please continue to refer to this. Figure 20 , Figure 20 This is a schematic diagram of the structure of the battery pack 100 in the sixth embodiment of this application.

[0100] Figure 20 In this embodiment, all battery cells 301 are arranged opposite to the same side of the first housing side 101. However, the battery cell assembly 30 is not arranged with one row of battery cells 301, but with two or more rows. In this case, the side of the battery cell 301 opposite to the power module 20 is no longer the first narrow surface 3011 of the battery cell 301, but the second narrow surface 3012 of the battery cell 301, specifically the bottom surface of the battery cell 301. In this embodiment, the first narrow surface 3011 of the top surface of the battery cell 301 is used to set the terminal post 3014. Since the terminal post 3014 is protruding, setting the relatively flat second narrow surface 3012 of the bottom surface opposite to the thermal management assembly 40 can better implement thermal management. At this time, the height direction z of the battery cell 301 is parallel to the first direction X, and multiple rows of battery cells 301 are distributed along the third direction Z, which is parallel to the length direction y of the battery cell 301. The power module 20 is correspondingly arranged at the bottom of the battery housing 10, and the first housing side 101 is... Figure 19From the bottom of the battery casing 10, the thermal management component 40 is also distributed between the cell assembly 30 and the power module 20. Similarly, in this embodiment, when the power module 20 is set so that one side of the cell assembly 30 is in a hot environment, the thermal management component 40 is set to improve the thermal management of the side near the power module 20. The specific structure of the thermal management component 40 can be understood with reference to the above embodiment and will not be repeated.

[0101] This application also provides an energy storage system, including multiple battery packs 100 as described in any of the above embodiments. The multiple battery packs 100 are stacked, and the power modules 20 of adjacent battery packs 100 are plugged into each other or connected via connectors. The energy storage system has the same technical effects as the battery packs in any of the above embodiments, and the connection is more convenient as the power modules 20 of adjacent battery packs 100 are plugged into each other or connected via connectors. For example, when adjacent battery packs are stacked, the power modules 20 are also arranged in the same direction, so adjacent power modules 20 can be plugged in. If, due to space constraints, the power modules 20 are staggered after the battery packs 100 are stacked, they can be connected via connectors to adapt to the site layout.

[0102] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery pack, characterized in that, include: Battery casing (10); A battery cell assembly (30) comprising a plurality of battery cells (301) located within the battery casing (10); A power module (20) is located on one side of the battery casing (10); A thermal management component (40) is located between the battery cell assembly (30) and the power module (20), and the thermal management component (40) includes at least one of a heat dissipation component (402) and a heat storage component (403).

2. The battery pack according to claim 1, characterized in that, The thermal management component (40) includes the heat storage component (403) and the heat dissipation component (402), with the heat storage component (403) located between the battery cell assembly (30) and the heat dissipation component (402); or, the thermal management component (40) includes the heat dissipation component (402) and a heat conduction component (401), with the heat conduction component (401) located between the battery cell assembly (30) and the heat dissipation component (402).

3. The battery pack according to claim 1, characterized in that, The heat dissipation component (402) includes at least one heat dissipation channel (402a) for flowing cooling medium.

4. The battery pack according to claim 3, characterized in that, The heat dissipation component (402) includes a first plate (4021) and a second plate (4022) disposed opposite to each other, and a plurality of third plates (4023). The third plates (4023) are located between the first plate (4021) and the second plate (4022). Two adjacent third plates (4023) and the first plate (4021) and the second plate (4022) enclose a heat dissipation channel (402a).

5. The battery pack according to claim 3, characterized in that, The thermal management component (40) includes a via (40a) that penetrates the thermal management component (40) along the distribution direction of the power module (20) and the cell assembly (30), and the via (40a) and the heat dissipation channel (402a) are isolated from each other.

6. The battery pack according to claim 1, characterized in that, The thermal management component (40) includes the heat storage component (403) and the heat dissipation component (402). The heat storage component (403) includes a heat storage material, and the heat dissipation component (402) includes a first plate (4021). The thermal management component (40) also includes a flange (404) located at the edge of the first plate (4021), the flange (404) extending toward the battery casing (10), the flange (404) and the first plate (4021) enclosing an accommodating space, and the heat storage material filling the accommodating space.

7. The battery pack according to claim 1, characterized in that, One side of the battery housing (10) is a first housing side (101), and the power module (20) is located on one side of the first housing side (101); the battery housing (10) includes a second housing side (102) adjacent to the first housing side (101); there is a gap between the battery cell (301) and the second housing side (102); The power module (20) includes an electrical connector (202), and the first housing side (101) is provided with an opening (1012). The electrical connector (202) is inserted into the opening (1012) and located in the gap to be electrically connected to the battery cell (301).

8. The battery pack according to any one of claims 1-7, characterized in that, The same side of each of the plurality of cells (301) of the cell assembly (30) is disposed opposite to the thermal management assembly (40).

9. The battery pack according to claim 8, characterized in that, The battery cell (301) includes multiple sides, each side including two large surfaces (3013) arranged opposite each other, and a pair of first narrow surfaces (3011) and a pair of second narrow surfaces (3012); the multiple battery cells (301) are arranged with the large surfaces (3013) facing each other. The first narrow facet (3011) on the same side of the plurality of battery cells (301) is disposed opposite to the thermal management component (40); or, the second narrow facet (3012) on the same side of the plurality of battery cells (301) is disposed opposite to the thermal management component (40).

10. The battery pack according to any one of claims 1-7, characterized in that, The area of ​​the side of the battery housing (10) opposite to the power module (20) is not less than the area of ​​any other side of the battery housing (10).

11. An energy storage system, characterized in that, The battery pack (100) includes any one of claims 1-10, wherein the battery packs (100) are stacked, and the power modules (20) of two adjacent battery packs (100) are plugged into each other or connected by a connector.

12. The energy storage system according to claim 11, characterized in that, The thermal management assembly (40) of the plurality of battery packs (100) includes the heat dissipation component (402), the heat dissipation component (402) includes a heat dissipation channel (402a), and the heat dissipation channels (402a) of adjacent battery packs (100) are interconnected.

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