Energy storage system and battery pack

Abstract

The application provides an energy storage system and a battery pack. The battery pack comprises a support, a first cell layer fixed on the support, a second cell layer fixed on the support and spaced and stacked with the first cell layer and located on the top side of the first cell layer, a first liquid cooling structure fixed on the support and located between the first cell layer and the second cell layer, the surface of the first liquid cooling structure facing the first cell layer is in thermal contact with the first cell layer, and the surface of the first liquid cooling structure facing the second cell layer is in thermal contact with the second cell layer; the support can bear the first cell layer and the first liquid cooling structure and the second cell layer respectively. The first liquid cooling structure can be in thermal contact with the first cell layer and the second cell layer at the same time, that is, the first liquid cooling structure can simultaneously perform heat transfer for the first cell layer and the second cell layer, the heat transfer efficiency is high, and therefore the battery pack has high heat dissipation efficiency. Meanwhile, the support can support the cell layer and the liquid cooling structure respectively, so that the cell layer does not bear too much pressure.

Description

Technical Field

[0001] This application relates to the field of energy storage, specifically to an energy storage system and battery pack. Background Technology

[0002] Traditionally, to improve the energy storage capacity of a battery pack, multiple layers of cells are stacked together. Due to the multiple stacked cell layers, the heat dissipation efficiency of the battery pack is required to be high. Utility Model Content

[0003] This application provides an energy storage system and battery pack with high heat dissipation efficiency through multiple embodiments.

[0004] On one hand, this application provides a battery pack, the battery pack comprising:

[0005] support;

[0006] The first battery cell layer is fixedly mounted on the bracket;

[0007] The second cell layer is stacked at a distance from the first cell layer and is located on the top side of the first cell layer; the second cell layer includes a second cell group and an end plate, the end plate being disposed at both ends of the second cell group;

[0008] A first liquid cooling structure is located between the first battery cell layer and the second battery cell layer; the surface of the first liquid cooling structure facing the first battery cell layer is in thermal contact with the first battery cell layer; the surface of the first liquid cooling structure facing the second battery cell layer is in thermal contact with the second battery cell layer.

[0009] The bracket supports the second battery cell assembly via the end plate and can respectively support the first battery cell layer, the first liquid cooling structure, and the second battery cell layer.

[0010] In some embodiments, the battery pack further includes:

[0011] The second liquid cooling structure is fixedly mounted on the bracket and located on the side of the first battery cell layer away from the second battery cell layer; the surface of the second liquid cooling structure facing the first battery cell layer is in thermal contact with the first battery cell layer; and the bracket is capable of supporting the second liquid cooling structure and the first battery cell layer respectively.

[0012] In some embodiments, the battery pack further includes:

[0013] The third liquid cooling structure is fixedly mounted on the bracket and located on the side of the second battery cell layer away from the first battery cell layer; the surface of the third liquid cooling structure facing the second battery cell layer is in thermal contact with the second battery cell layer; and the bracket can support the second battery cell layer and the third liquid cooling structure respectively.

[0014] In some embodiments, the bracket includes an intermediate support frame disposed between the first cell layer and the second cell layer; the intermediate support frame is used to separate the first liquid cooling structure and the first cell layer, and to support the second cell assembly by supporting the end plate.

[0015] In some embodiments, the bracket includes an intermediate support frame disposed between the first battery cell layer and the second battery cell layer, the intermediate support frame including a support beam, and the second battery cell layer being fixedly disposed on the support beam.

[0016] In some embodiments, the first liquid cooling structure is located between the first cell layer and the support beam.

[0017] In some embodiments, the support beam is provided with a first fixing hole, and the first liquid cooling structure is provided with a second fixing hole that matches the first fixing hole; the battery pack further includes a first fixing member, which passes through the first fixing hole and the second fixing hole to achieve a fixed connection between the support beam and the first liquid cooling structure.

[0018] In some embodiments, the direction in which the end plates at both ends of the same second cell group are arranged is the first direction; the direction in which the first cell layer and the second cell layer are stacked is the second direction; and the direction perpendicular to both the first direction and the second direction is the third direction.

[0019] The intermediate support frame also includes a first limiting beam and a second limiting beam respectively disposed on both sides of the first liquid cooling structure along a third direction, and both the first limiting beam and the second limiting beam are fixedly connected to the support beam.

[0020] In some embodiments, the first cell layer includes a first cell group; the bracket further includes end plates fixedly disposed at both ends of the first cell group; the first liquid cooling structure is clamped and fixed by the support beam and the end plates located at both ends of the first cell group.

[0021] On the other hand, this application also provides an energy storage system, including the battery pack described in any one of the embodiments of this application.

[0022] In the various embodiments provided in this application, the first liquid cooling structure can simultaneously make thermal contact with both the first and second battery cell layers, thus enabling simultaneous heat transfer between them. This results in high heat transfer efficiency and a high heat dissipation efficiency for the battery pack. Simultaneously, the support structure can separately support the battery cell layers and the liquid cooling structure, preventing the battery cell layers from bearing excessive pressure. Attached Figure Description

[0023] Figure 1 An exploded view of a battery pack provided for one embodiment of this application.

[0024] Figure 2 for Figure 1 A schematic diagram of the first liquid cooling structure.

[0025] Figure 3 This is a schematic diagram of the first liquid cooling structure provided in another embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the first liquid cooling structure provided in another embodiment of this application.

[0027] Figure 5 This is a schematic diagram of the structure of a battery pack provided in another embodiment of this application.

[0028] Figure 6 An exploded view of a battery pack provided in another embodiment of this application.

[0029] Figure 7 An exploded view of a battery pack provided in another embodiment of this application.

[0030] Figure 8 An exploded view of a battery pack provided in another embodiment of this application.

[0031] Explanation of reference numerals in the attached figures

[0032] 100 / 200 / 300 / 400 / 500, Battery Pack; 110, First Cell Layer; 111, First Cell Group; 120, Second Cell Layer; 121, Second Cell Group; 101, Cell; 130, First Liquid Cooling Structure; 131, Second Fixing Hole; 140, Second Liquid Cooling Structure; 150, Third Liquid Cooling Structure; 160, Bracket; 161, Intermediate Support Frame; 162, Support Beam; 1621, First Fixing Hole; 163, End Plate; 164, First Limiting Beam; 165, Second Limiting Beam; 166, Bottom Support Frame; aa, First Direction; bb, Second Direction; cc, Third Direction. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0034] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0035] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0036] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of this application, "several" means one or more, unless otherwise explicitly specified.

[0037] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0038] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0040] Researchers discovered that in traditional battery packs with multiple stacked cell layers, the liquid cooling mechanism only has one surface in thermal contact with the cell, resulting in low heat dissipation efficiency.

[0041] Based on this, researchers have proposed a battery pack in which a first liquid cooling structure is set between the first and second battery cell layers that are stacked at intervals. Both sides of the first liquid cooling structure are in thermal contact with the first and second battery cell layers at the same time. Therefore, both surfaces of the first liquid cooling structure are used for heat transfer, resulting in high heat transfer efficiency. Thus, the battery pack has high heat dissipation efficiency.

[0042] In addition, the battery pack also includes a support frame, on which the first cell layer, the second cell layer, and the first liquid cooling structure are all fixed. The first liquid cooling structure does not bear the weight of the second cell layer; the first cell layer does not bear the weight of the first liquid cooling structure. This reduces the stress on the first cell layer and the first liquid cooling structure, thus improving their service life.

[0043] See Figure 1 and Figure 2 A battery pack 100 provided in one embodiment of this application includes a bracket 160, a first cell layer 110, a second cell layer 120, and a first liquid cooling structure 130. The first cell layer 110, the second cell layer 120, and the first liquid cooling structure 130 are all fixedly mounted on the bracket 160. The second cell layer 120 is stacked at a distance from the first cell layer 110 and is located on the top side of the first cell layer 110. The first liquid cooling structure 130 is located between the first cell layer 110 and the second cell layer 120; the surface of the first liquid cooling structure 130 facing the first cell layer 110 is in thermal contact with the first cell layer 110; the surface of the first liquid cooling structure 130 facing the second cell layer 120 is in thermal contact with the second cell layer 120. The second cell layer 120 includes a second cell group 121 and an end plate 163. The end plate 163 is disposed at both ends of the second cell group 121. The bracket 160 supports the second cell group 121 through the end plate 163 and can respectively support the first cell layer 110, the first liquid cooling structure 130, and the second cell layer 120.

[0044] In the aforementioned battery pack 100, the first liquid cooling structure 130 can simultaneously make thermal contact with the first cell layer 110 and the second cell layer 120, thus simultaneously transferring heat to both layers. This results in high heat transfer efficiency, giving the battery pack 100 high heat dissipation efficiency. Simultaneously, the bracket 160 can support both the cell layers and the liquid cooling structure, preventing the cell layers from bearing excessive pressure.

[0045] Furthermore, the first liquid cooling structure 130 does not bear the weight of the second cell layer 120; the first cell layer 110 does not bear the weight of the first liquid cooling structure 130. This reduces the stress on the first cell layer 110 and the first liquid cooling structure 130, thus improving their service life.

[0046] Understandably, the first battery cell layer 110 is fixedly mounted on the bracket 160, and its weight is balanced by the supporting force of the bracket 160. Similarly, the second battery cell layer 120 is fixedly mounted on the bracket 160, and its weight is balanced by the supporting force of the bracket 160; the first liquid cooling structure 130 is fixedly mounted on the bracket 160, and its weight is balanced by the supporting force of the bracket 160.

[0047] In addition, the battery pack 100 has high heat dissipation efficiency, which can maintain the safety performance of the battery pack 100 for a longer period of time and improve the service life of the battery pack 100.

[0048] Furthermore, the first liquid cooling structure 130 has high heat transfer efficiency, thus reducing or even eliminating the need for other heat dissipation structures while maintaining a certain heat transfer efficiency requirement. This simplifies the structure of the battery pack 100 and reduces its production cost. Further, it helps meet the demands for increased energy density and miniaturization in the battery pack 100.

[0049] Furthermore, the two surfaces of the first liquid cooling structure 130 are used to transfer heat with the battery cell layer, which reduces the surface area of ​​the first liquid cooling structure 130 exposed outside the battery cell layer and reduces the efficiency of the first liquid cooling structure 130 in transferring cold energy through the exposed surface, thereby avoiding the waste of cold energy.

[0050] It is understandable that the battery pack 100 provided in this application is used in an energy storage system. Generally, the battery pack 100 used in an energy storage system is relatively large in size, so the size of the first liquid cooling structure 130 is also relatively large, resulting in a higher total heat dissipation per unit time. In this application, the heat dissipation surface of the first liquid cooling structure 130 is changed from one to two, significantly improving the total heat dissipation per unit time.

[0051] In this embodiment, the first liquid cooling structure 130 is an aluminum extruded liquid cooling plate, the structure of which is described in [reference needed]. Figure 2 It should be noted that, in some other embodiments, the first liquid cooling structure 130 is not limited to an aluminum extruded liquid cooling plate, but can also be other forms of liquid cooling structure, such as... Figure 3 The stamped liquid cooling plate shown, and Figure 4 The flat tube shown is not specifically limited here.

[0052] Specifically, in this embodiment, the bracket 160 includes an intermediate support frame 161 disposed between the first battery cell layer 110 and the second battery cell layer 120. The intermediate support frame 161 separates the first liquid cooling structure 130 and the first battery cell layer 110, and supports the second battery cell assembly 121 via a support end plate 163. The intermediate support frame 161 includes a support beam 162, on which the second battery cell layer 120 is fixedly disposed. It is understood that the support beam 162 is located on the bottom side of the second battery cell layer 120 and can support the second battery cell layer 120. In other words, the supporting force of the support beam 162 on the second battery cell layer 120 is balanced with the gravity of the second battery cell layer 120.

[0053] More specifically, in this embodiment, the second cell layer 120 includes a second cell group 121. The bracket 160 also includes end plates 163 disposed at both ends of the second cell group 121, and the end plates 163 are fixedly connected to the support beam 162. It can be understood that the cells 101 in the second cell group 121 are disposed between the end plates 163.

[0054] For ease of description, the direction in which the end plates 163 of the two segments of the same second cell group 121 are arranged is defined as the first direction aa; the direction in which the first cell layer 110 and the second cell layer 120 are stacked is defined as the second direction bb; and the direction perpendicular to both the first direction aa and the second direction bb is defined as the third direction cc.

[0055] In this embodiment, the intermediate support frame 161 includes three support beams 162 arranged along the first direction aa. The second cell layer 120 includes four second cell groups 121, which are arranged in a matrix of two rows and two columns, with two rows along the first direction aa and two columns along the third direction cc. Each pair of adjacent cell groups 101 along the first direction aa has four end plates 163. Along the first direction aa, the two end plates 163 in the middle are fixedly connected to the support beams 162 in the middle position; the two end plates 163 at both ends are fixedly connected to the support beams 162 at both ends. It is understood that in other embodiments, the number of second cell groups 121 is not limited to four; it can be one, two, three, or more than four, depending on the requirements. Similarly, the arrangement of the second cell groups can also be set as needed, and is not specifically limited here. Accordingly, based on the setting of the second battery cell group 121, the number and arrangement of the support beams 162 can be specifically set, and there is no specific limitation on the number and arrangement of the support beams 162 here.

[0056] In this embodiment, similar to the second cell layer 120, the first cell layer 110 also includes four first cell groups 111. Specifically, the four first cell groups 111 are distributed in an array of two rows and two columns, with two rows distributed along the first direction aa and two columns distributed along the third direction cc. Similarly, it can be understood that the number of first cell groups 111 is not limited to four; it can also be one, two, three, or more than four, as needed, and is not specifically limited here. The arrangement of the first cell groups 111 can also be set as needed, and is not specifically limited here.

[0057] In this embodiment, the number of the first cell group 111 and the number of the second cell group 121 are the same, and the arrangement of the first cell group 111 and the second cell group 121 are the same. It is understood that in other embodiments, the number of the first cell group 111 and the second cell group 121 may be different, and the arrangement of the first cell group 111 and the second cell group 121 may also be different. These can be set as needed, and no specific limitation is made here.

[0058] In this embodiment, both the first cell group 111 and the second cell group 121 include a plurality of cells 101. It is understood that in other embodiments, the number of cells in the first cell group 111 and the second cell group 121 is not limited to a plurality, but may also be a single cell; the number of cells in the first cell group 111 and the second cell group 121 may be the same or different, and can be set as needed, without limitation here.

[0059] In this embodiment, the battery cells 101 in the first battery cell group 111 and the second battery cell group 121 are arranged sideways. In other words, the large surface of the battery cell 101 is parallel to the second direction bb, and the area occupied by the surface of the battery cell 101 perpendicular to the second direction bb is small. It is understood that in some other embodiments, the battery cells are not limited to being arranged sideways, and can also be placed in other regular or irregular directions, which is not specifically limited here.

[0060] In this embodiment, the first liquid cooling structure 130 is located between the first battery cell layer 110 and the support beam 162. In other words, the first liquid cooling structure 130 is located on the side of the support beam 162 opposite to the second battery cell layer 120.

[0061] In this embodiment, the first liquid cooling structure 130 is fixedly mounted on the support beam 162.

[0062] Specifically, in this embodiment, the support beam 162 is provided with a first fixing hole 1621, and the first liquid cooling structure 130 is provided with a second fixing hole 131 that matches the first fixing hole 1621. The battery pack 100 also includes a first fixing member (not shown), which passes through the first fixing hole 1621 and the second fixing hole 131 to achieve a fixed connection between the support beam 162 and the first liquid cooling structure 130.

[0063] Specifically, optionally, the first fixing member is a nut, and the second fixing hole 131 is a threaded hole. During installation, the first fixing member first passes through the first fixing hole 1621 and then is threadedly connected to the second fixing hole 131, thereby achieving a fixed connection between the support beam 162 and the first liquid cooling structure 130. It is understood that the first fixing member is not limited to a nut, but can also be a pin, etc. Correspondingly, the first fixing hole 1621 and the second fixing hole 131 can be matched with the first fixing member.

[0064] It is understood that in other embodiments, the way the support beam 162 and the first liquid cooling structure 130 are fixedly connected is not limited to this, and they can also be connected by welding, bonding, snap-fitting, etc.

[0065] In this embodiment, the intermediate support frame 161 further includes a first limiting beam 164 and a second limiting beam 165 respectively disposed on both sides of the first liquid cooling structure 130 along the third direction cc. The first limiting beam 164 and the second limiting beam 165 are both fixedly connected to the support beam 162. The first limiting beam 164 and the second limiting beam 165 limit the third direction cc of the first liquid cooling structure 130, preventing the first liquid cooling structure 130 from moving along the third direction cc.

[0066] In addition, it is understandable that the first limiting beam 164 and the second limiting beam 165 can also serve as positioning structures for the first liquid cooling structure 130 during installation, enabling faster positioning of the first liquid cooling structure 130 in the third direction cc, thereby improving the installation efficiency of the first liquid cooling structure 130.

[0067] More specifically, in this embodiment, both the first limiting beam 164 and the second limiting beam 165 are located on the bottom side of the support beam 162. It is understood that in other embodiments, the first limiting beam 164 and the second limiting beam 165 are not limited to being located on the bottom side of the support beam 162. They can be adjusted according to their own structure and the position of the first liquid cooling structure 130, so that the position of the first liquid cooling structure 130 along a third direction (cc) can be achieved.

[0068] In this embodiment, the first limiting beam 164, the second limiting beam 165, and the support beam 162 are separately configured, with both the first limiting beam 164 and the second limiting beam 165 fixedly connected to the support beam 162. In other embodiments, the first limiting beam 164 and the second limiting beam 165 may also be integrally formed with the support beam 162.

[0069] Optionally, both the first limiting beam 164 and the second limiting beam 165 are fixedly connected to the support beam 162 by welding. It is understood that in some embodiments, the method of fixing the first limiting beam 164 and the second limiting beam 165 to the support beam 162 is not limited to welding, but can also be adhesive bonding, pin connection, snap-fit ​​connection, etc.

[0070] In this embodiment, the bracket 160 further includes a bottom support frame 166, on which the first battery cell layer 110 is fixedly mounted. It is understood that the bottom support frame 166 is used to fix and support the first battery cell layer 110.

[0071] More specifically, the bracket 160 also includes end plates 163 fixedly disposed at both ends of the first battery cell assembly 111, and the end plates 163 are fixedly connected to the bottom support frame 166. In this embodiment, the way the end plates 163 are fixedly connected to the bottom bracket is the same as the way the end plates 163 are fixedly connected to the intermediate support frame 161, and will not be described again here.

[0072] Optionally, thermally conductive adhesive can be provided between the first liquid cooling structure 130 and the first battery cell layer 110, and between the first liquid cooling structure 130 and the second battery cell layer 120. This can improve thermal conductivity and also serve as a buffer structure to reduce stress between the first liquid cooling structure 130 and the first battery cell layer 110 and the second battery cell layer 120, thereby improving their service life.

[0073] In this embodiment, the battery pack 100 includes two cell layers, namely a first cell layer 110 and a second cell layer 120. It is understood that in other embodiments, the number of cell layers is not limited to two, but may be more than two. The first cell layer 110 and the second cell layer 120 can be any two adjacent stacked cell layers. In other words, the first cell layer 110 is not limited to the bottommost cell layer, and the second cell layer 120 is not limited to the topmost cell layer. Any two adjacent stacked cell layers can be considered as the first cell layer 110 and the second cell layer 120. If a liquid cooling structure is provided between the two adjacent stacked cell layers, and their connection relationship, structure, etc., meet the limitations regarding cell layers and liquid cooling structures in the embodiments of this application, then they can be considered to be covered within the protection scope of this application.

[0074] See Figure 5 In another embodiment of this application, the battery pack 200 differs from the battery pack 100 in that the first liquid cooling structure 130 is clamped and fixed by a support beam 162 and end plates 163 located at both ends of the first cell layer 110. This facilitates the fixed connection of the first liquid cooling structure 130, simplifying operation; it also reduces the number of connection holes on the first liquid cooling structure 130, thus reducing stress concentration; furthermore, the fixed position between the first liquid cooling structure 130 and the end plates 163 allows for a tighter fit between the first liquid cooling structure 130 and the first cell assembly 111 fixed to the end plates 163, resulting in a more secure fit between the first liquid cooling structure 130 and the first cell layer 110, enabling them to maintain higher heat transfer efficiency for a longer period.

[0075] See Figure 6 Another embodiment of this application provides a battery pack 300, which differs from the battery pack 100 in that it further includes a second liquid cooling structure 140. The second liquid cooling structure 140 is fixedly mounted on the bracket 160 and located on the side of the first cell layer 110 facing away from the second cell layer 120; the surface of the second liquid cooling structure 140 facing the first cell layer 110 is in thermal contact with the first cell layer 110. The first liquid cooling structure 130 and the second liquid cooling structure 140 work together to improve the cooling efficiency of the battery pack 300. Specifically, since the second liquid cooling structure 140 is in thermal contact with the first cell layer 110, heat transfer can occur between the second liquid cooling structure 140 and the first cell layer 110 to cool the first cell layer 110. In addition, the heat in the bottom region of the first cell layer 110 is cooled by the second liquid cooling structure 140, so the heat dissipated from the first cell layer 110 and rising to the first liquid cooling structure 130 is reduced, thereby enabling the first liquid cooling structure 130 to better cool the second cell layer 120, thereby improving the cooling efficiency of the second cell layer 120.

[0076] In addition, the bracket 160 can support the second liquid cooling structure 140 and the first battery cell layer 110 respectively. The second liquid cooling structure 140 does not bear the self-weight load of the first battery cell layer 110, which reduces the stress on the second liquid cooling structure 140 and improves its service life.

[0077] In this embodiment, the second liquid cooling structure 140 is a stamped liquid cooling plate. It should be noted that in other embodiments, the second liquid cooling structure 140 is not limited to a stamped liquid cooling plate, but can also be other forms of liquid cooling structures, such as extruded aluminum liquid cooling plates or flat tubes. For examples of extruded aluminum liquid cooling plates and flat tube forms of liquid cooling structures, please refer to... Figure 2 and Figure 4 .

[0078] In this embodiment, the second liquid cooling structure 140 is fixedly mounted on the bottom support frame 166.

[0079] Optionally, in some embodiments, the second liquid cooling structure 140 is not limited to being directly fixedly connected to the bottom support frame 166, but can also be clamped and fixed by the bottom support frame 166 and the end plates 163 located at both ends of the first cell layer 110, which facilitates assembly.

[0080] Optionally, thermally conductive adhesive is provided between the second liquid cooling structure 140 and the first battery cell layer 110 to improve thermal conductivity.

[0081] In this embodiment, the first liquid cooling structure 130 and the second liquid cooling structure 140 are of different types. It is understood that in other embodiments, the first liquid cooling structure 130 and the second liquid cooling structure 140 may be of the same type.

[0082] See Figure 7 Another embodiment of this application provides a battery pack 400, which differs from the battery pack 100 in that it further includes a third liquid cooling structure 150. The third liquid cooling structure 150 is fixedly mounted on the bracket 160 and located on the side of the second cell layer 120 facing away from the first cell layer 110; the surface of the third liquid cooling structure 150 facing the second cell layer 120 is in thermal contact with the second cell layer 120. The first liquid cooling structure 130 and the third liquid cooling structure 150 work together to improve the cooling efficiency of the battery pack 400. That is, the third liquid cooling structure 150 can cool the first cell layer 110 and the second cell layer 120 more quickly. Specifically, since the third liquid cooling structure 150 is in thermal contact with the second cell layer 120, heat transfer can occur between the third liquid cooling structure 150 and the second cell layer 120 to cool the second cell layer 120. In addition, the heat in the top region of the second cell layer 120 is cooled by the second liquid cooling structure 140, and the heat at the bottom of the battery pack 400 can rise more quickly to be cooled by the third liquid cooling structure 150, thereby improving the cooling efficiency of the first cell layer 110.

[0083] In addition, the bracket 160 can support the second cell layer 120 and the third liquid cooling structure 150 respectively. The second cell layer 120 does not bear the self-weight load of the third liquid cooling structure 150, thereby reducing the stress on the second cell layer 120 and improving its service life.

[0084] In this embodiment of the application, the battery pack 300 further includes: a second liquid cooling structure 140 and a third liquid cooling structure 150. The second liquid cooling structure 140 is fixedly mounted on the bracket 160 and is located on the side of the first cell layer 110 away from the second cell layer 120. The surface of the second liquid cooling structure 140 facing the first cell layer 110 is in thermal contact with the first cell layer 110. In terms of gravity bearing, the second liquid cooling structure 140 and the first cell layer 110 are independent of each other, that is, the second liquid cooling structure 140 will not bear the pressure of the first cell layer 110. The third liquid cooling structure 150 is fixed on the bracket 160 and located on the side of the second battery cell layer 120 away from the first battery cell layer 110. The surface of the third liquid cooling structure 150 facing the second battery cell layer 140 is in thermal contact with the second battery cell layer 120. In terms of gravity bearing, the second battery cell layer 120 and the third liquid cooling structure 150 are independent of each other, that is to say, the second battery cell layer 120 will not bear the pressure of the third liquid cooling structure 150.

[0085] In this embodiment, the third liquid cooling structure 150 is a flat tube. It should be noted that in other embodiments, the third liquid cooling structure 150 is not limited to a flat tube, but can also be other forms of liquid cooling structures, such as extruded aluminum liquid cooling plates or stamped liquid cooling plates. For reference, see the descriptions of extruded aluminum liquid cooling plates and stamped liquid cooling plates. Figure 2 and Figure 3 .

[0086] Optionally, thermally conductive adhesive is provided between the third liquid cooling structure 150 and the second battery cell layer 120 to improve thermal conductivity.

[0087] In some embodiments, the third liquid cooling structure 150 may also be fixedly disposed on the end plates 163 at both ends of the second cell assembly 121. Of course, in some embodiments, the battery pack 100 may also include a cover plate disposed on the top side of the second cell layer 120, and the third liquid cooling structure 150 may also be clamped and fixed to the end plates 163 at both ends of the second cell assembly 121 by the cover plate.

[0088] See Figure 8Another embodiment of this application provides a battery pack 500, which differs from the battery pack 100 in that it further includes a second liquid cooling structure 140 and a third liquid cooling structure 150. The second liquid cooling structure 140 is disposed on the side of the first cell layer 110 facing away from the second cell layer 120; the surface of the second liquid cooling structure 140 facing the first cell layer 110 is in thermal contact with the first cell layer 110. The third liquid cooling structure 150 is disposed on the side of the second cell layer 120 facing away from the first cell layer 110; the surface of the third liquid cooling structure 150 facing the second cell layer 120 is in thermal contact with the second cell layer 120. The second liquid cooling structure 140, the third liquid cooling structure 150, and the first liquid cooling structure 130 work together to improve the cooling efficiency of the battery pack. The configuration of the second liquid cooling structure 140 and the third liquid cooling structure 150 can be referred to the descriptions of the configuration of the second liquid cooling structure 140 and the third liquid cooling structure 150 in the battery pack 300 and battery pack 400, respectively, and will not be repeated here.

[0089] One embodiment of this application provides an energy storage system, which includes a battery pack provided in any embodiment of this application.

[0090] The first liquid cooling structure 130 can simultaneously make thermal contact with the first cell layer 110 and the second cell layer 120, thus simultaneously transferring heat to the first cell layer 110 and the second cell layer 120. The heat transfer efficiency is high, so the battery pack 100 has a high heat dissipation efficiency.

[0091] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0092] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0093] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0094] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, The battery pack includes: support; The first battery cell layer is fixedly disposed on the bracket; The second cell layer is stacked at a distance from the first cell layer and is located on the top side of the first cell layer; the second cell layer includes a second cell group and an end plate, the end plate being disposed at both ends of the second cell group; A first liquid cooling structure is located between the first battery cell layer and the second battery cell layer; the surface of the first liquid cooling structure facing the first battery cell layer is in thermal contact with the first battery cell layer; the surface of the first liquid cooling structure facing the second battery cell layer is in thermal contact with the second battery cell layer. The bracket supports the second battery cell assembly via the end plate and can respectively support the first battery cell layer, the first liquid cooling structure, and the second battery cell layer.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes: The second liquid cooling structure is fixedly mounted on the bracket and located on the side of the first battery cell layer away from the second battery cell layer; the surface of the second liquid cooling structure facing the first battery cell layer is in thermal contact with the first battery cell layer; and the bracket is capable of supporting the second liquid cooling structure and the first battery cell layer respectively.

3. The battery pack according to any one of claims 1 or 2, characterized in that, The battery pack also includes: The third liquid cooling structure is fixedly mounted on the bracket and located on the side of the second battery cell layer away from the first battery cell layer; the surface of the third liquid cooling structure facing the second battery cell layer is in thermal contact with the second battery cell layer; and the bracket can support the second battery cell layer and the third liquid cooling structure respectively.

4. The battery pack according to any one of claims 1 to 3, characterized in that, The bracket includes an intermediate support frame disposed between the first cell layer and the second cell layer; the intermediate support frame is used to separate the first liquid cooling structure and the first cell layer, and to support the second cell assembly by supporting the end plate.

5. The battery pack according to claim 4, characterized in that, The intermediate support frame includes a support beam, and the second battery cell layer is fixedly disposed on the support beam.

6. The battery pack according to claim 5, characterized in that, The first liquid cooling structure is located between the first battery cell layer and the supporting beam.

7. The battery pack according to claim 5, characterized in that, The support beam is provided with a first fixing hole, and the first liquid cooling structure is provided with a second fixing hole that matches the first fixing hole; the battery pack also includes a first fixing member, which passes through the first fixing hole and the second fixing hole to realize the fixed connection between the support beam and the first liquid cooling structure.

8. The battery pack according to any one of claims 6 or 7, characterized in that, The direction in which the end plates at both ends of the same second cell group are arranged is the first direction; the direction in which the first cell layer and the second cell layer are stacked is the second direction; and the direction perpendicular to both the first direction and the second direction is the third direction. The intermediate support frame also includes a first limiting beam and a second limiting beam respectively disposed on both sides of the first liquid cooling structure along a third direction, and both the first limiting beam and the second limiting beam are fixedly connected to the support beam.

9. The battery pack according to claim 6, characterized in that, The first cell layer includes a first cell group; the bracket also includes end plates fixed at both ends of the first cell group; the first liquid cooling structure is clamped and fixed by the support beam and the end plates located at both ends of the first cell group.

10. An energy storage system, characterized in that, The energy storage system includes the battery pack as described in any one of claims 1 to 9.

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