Energy storage system

Abstract

The utility model discloses an energy storage system, and belongs to the technical field of energy storage. The energy storage system comprises a cabinet body; the at least one battery cell group is arranged in the cabinet body and comprises a plurality of battery cells, and pole columns of the battery cells are positioned at the tops of the battery cells; in the same battery cell group, the polarities of the oppositely arranged pole columns between the two adjacent battery cells are opposite, and the battery cells are sequentially connected in series; and an accommodating structure, wherein the battery cell group is mounted in the accommodating structure. Through the arrangement of the battery core led out from the top of the pole, the longitudinal space in the energy storage system is saved, and the space utilization rate of the energy storage system is improved; by combining the position design of the pole columns with different polarities of the plurality of battery cells, the plurality of battery cells can be connected in series in sequence, voltage superposition is realized under the condition of not increasing additional components, and the output voltage of the whole battery pack is improved; the balance of charge distribution in the battery cell group is facilitated, the mutual influence among the battery cells is reduced, and the stability and safety of the energy storage system are further improved.

Description

Technical Field

[0001] This application belongs to the technical field of energy storage, and particularly relates to an energy storage system. Background Art

[0002] With the rapid development of application fields such as new energy vehicles and grid energy storage, the demand for high-performance and high-safety energy storage systems is increasing day by day. As the core component of the energy storage system, the structural design of the energy storage battery directly affects the performance and safety of the entire energy storage system.

[0003] In related technologies, the overall design of the energy storage system is basically from the battery cell to the module, then to the battery pack, and then to the battery cluster. However, in actual applications, the complexity of design and process assembly is relatively large, resulting in a relatively high overall manufacturing cost; and the space occupied by the battery pack is too large, and the number of battery cells that can be accommodated is small, which limits the overall stored power and energy density of the energy storage system. Summary of the Utility Model

[0004] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides an energy storage system, which saves the longitudinal space in the energy storage system and improves the space utilization rate of the energy storage system; enables multiple battery cells to be connected in series in sequence, realizes the superposition of voltages, and increases the output voltage of the entire battery pack; helps to balance the charge distribution in the battery cell group, reduces the mutual influence between battery cells, and improves the stability and safety of the energy storage system.

[0005] In a first aspect, this application provides an energy storage system, including:

[0006] A cabinet;

[0007] At least one battery cell group, arranged in the cabinet, including a plurality of battery cells, and the pole columns of the battery cells are located at the tops of the battery cells; within the same battery cell group, the polarities of the relatively arranged pole columns between two adjacent battery cells are opposite, and the battery cells are connected in series in sequence;

[0008] A receiving structure, and the battery cell group is installed in the receiving structure.

[0009] According to the energy storage system of this application, through the arrangement of the battery cells with the pole columns led out at the top, compared with the common battery cells with the pole columns led out at the sides, the longitudinal interval distance between two adjacent battery cells can be greatly reduced, saving the longitudinal space in the energy storage system, thereby improving the space utilization rate of the energy storage system; at the same time, combined with the position design of the pole columns with different polarities of multiple battery cells, multiple battery cells can be connected in series in sequence, realizing the superposition of voltages without adding additional components, and increasing the output voltage of the entire battery pack; and it helps to balance the charge distribution in the battery cell group, reduces the mutual influence between battery cells, and further improves the stability and safety of the energy storage system.

[0010] According to an embodiment of the present application, the accommodating structure further includes:

[0011] a support structure and a pair of end plates, the battery cell group is supported on the support structure and is located between the pair of end plates in the stacking direction of the plurality of battery cells.

[0012] According to an embodiment of the present application, the end plate is provided with a notch, and the two outermost pole columns of the same battery cell group in the circuit structure are respectively connected with lead-out poles, and the lead-out poles penetrate through the notch.

[0013] According to an embodiment of the present application, the two lead-out poles corresponding to the same battery cell group penetrate through the notch of the same end plate.

[0014] According to an embodiment of the present application, the top surface of the end plate is higher than the top surface of the corresponding battery cell group.

[0015] According to an embodiment of the present application, the support structure includes: a liquid cooling plate and a support plate, and the end plate is connected to the support plate and the liquid cooling plate.

[0016] According to an embodiment of the present application, the end plate includes an end plate body and a flanging portion that is turned over in a direction away from the battery cell group, and at least one of the end plate body and the flanging portion is connected to the support plate.

[0017] According to an embodiment of the present application, the energy storage system further includes: a connecting rod, and the end plate body is connected to the support plate through the connecting rod.

[0018] According to an embodiment of the present application, the end plate body has a plurality of first cavities, and a first reinforcing rib is provided between adjacent cavities, and the connecting rod penetrates through the first reinforcing rib.

[0019] According to an embodiment of the present application, a plurality of battery cell groups are distributed in the horizontal direction, and the end plates corresponding to two adjacent battery cell groups are connected to the same support plate.

[0020] According to an embodiment of the present application, the battery cell groups are distributed in multiple layers in the vertical direction.

[0021] According to an embodiment of the present application, the end plates corresponding to each layer of battery cell groups and the accommodating structure are connected through a connecting rod extending in the vertical direction.

[0022] [[ID=THREE]]The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 is a schematic structural diagram of an energy storage system provided by an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a multi-layer battery cell provided by an embodiment of the present application;

[0026] Figure 3 is Figure 2 an enlarged structural view of part A in

[0027] Figure 4 is a partial schematic structural diagram of a two-layer battery cell provided by an embodiment of the present application;

[0028] Figure 5 is an exploded schematic structural diagram of a single-layer battery cell provided by an embodiment of the present application;

[0029] Figure 6 is one of the schematic structural diagrams of a single-layer battery cell provided by an embodiment of the present application;

[0030] Figure 7 is another schematic structural diagram of a single-layer battery cell provided by an embodiment of the present application;

[0031] Figure 8 is a schematic structural diagram of a housing structure provided by an embodiment of the present application;

[0032] Figure 9 is a schematic structural diagram of an end plate provided by an embodiment of the present application;

[0033] Figure 10 is a schematic structural diagram of a support plate provided by an embodiment of the present application;

[0034] Figure 11 is Figure 10 an enlarged structural view of part B in

[0035] Reference numerals:

[0036] energy storage system 1, power conversion system 10;

[0037] cabinet 20, cabinet upper cover 21, cabinet lower cover 22, column 23;

[0038] connecting rod 30;

[0039] battery cell group 40, battery cell 41;

[0040] housing structure 50;

[0041] End plate 51, end plate body 511, first cavity 5111, first reinforcing rib 5112, notch 5113, flange 512, second cavity 5121, second reinforcing rib 5122;

[0042] Support structure 52, liquid cooling plate 521, sub-plate 5211, connecting plate 5212, mounting groove 5213, water inlet 5214, water outlet 5215, support plate 522, weight reduction cavity 5221;

[0043] Lead-out pole 60, protective cover 70, busbar 80. DETAILED DESCRIPTION

[0044] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0045] Unless otherwise specified, the horizontal direction in the embodiment of the present application is Figure 2 The X direction is the longitudinal direction in the embodiment of the present application. Figure 2 The Y direction in the embodiment of the present application is the vertical direction. Figure 2 Middle Z direction.

[0046] The present application discloses an energy storage system 1 .

[0047] Reference below Figures 1-11 An energy storage system 1 according to an embodiment of the present application is described.

[0048] In some embodiments, as Figures 1-2 As shown, the energy storage system 1 includes: a cabinet 20 , a containing structure 50 and at least one battery cell group 40 .

[0049] like Figures 1-2 As shown, the battery cell group 40 is arranged in the cabinet 20, and the battery cell group 40 includes multiple battery cells 41, and the poles of the battery cells 41 are located at the top of the battery cells 41; in the same battery cell group 40, the polarities of the poles arranged relatively between two adjacent battery cells 41 are opposite, and each battery cell 41 is connected in series in sequence; the battery cell group 40 is installed in the containing structure 50.

[0050] like Figures 1-2 As shown, the energy storage system 1 also includes an electric energy conversion system 10, which is installed in the cabinet 20 and is electrically connected to the battery cell 41. The electric energy conversion system 10 is used to convert the direct current stored in the battery cell 41 into alternating current or perform other forms of electric energy processing.

[0051] Among them, the power conversion system 10 may include an inverter, a rectifier, and other power processing devices. The energy storage system 1 can be applied to a variety of application scenarios, such as home energy storage, grid regulation, containerized energy storage, and electric vehicles, etc., which are not limited here.

[0052] As Figure 1 shown, the cabinet body 20 includes a cabinet upper cover 21 and a cabinet lower cover 22 that are vertically separated, and a plurality of columns 23 supported between the cabinet upper cover 21 and the cabinet lower cover 22. The columns 23 can be used to support the structural strength of the cabinet body 20, prevent deformation during hoisting, and can also be used to separate the battery system and the power conversion system 10.

[0053] In this embodiment, as Figures 4-5 shown, the battery cell 41 can be a square battery cell 41. Compared with the common blade battery cell 41, the terminal post can be directly led out from the top of the battery cell 41. When designing, the longitudinal interval distance between adjacent battery cells 41 does not need to consider the position and size of the terminal post. In other words, after changing the leading direction of the terminal post, the longitudinal interval distance between adjacent battery cells 41 can be greatly reduced, and the width space occupied by multiple battery cells 41 is also greatly reduced.

[0054] In actual implementation, as Figures 5-6 shown, the positive terminal posts and negative terminal posts between two adjacent battery cells 41 can be arranged in a staggered manner to facilitate the series connection between multiple battery cells 41. Specifically, a battery cell group 40 can include at least one row of multiple battery cells 41 stacked horizontally. In each row of battery cells 41, between two adjacent battery cells 41, the positive terminal post at the first end in the longitudinal direction of one battery cell 41 is arranged opposite to the negative terminal post at the second end in the longitudinal direction of the other battery cell 41, and the negative terminal post at the second end in the longitudinal direction of one battery cell 41 is arranged opposite to the positive terminal post at the first end in the longitudinal direction of the other battery cell 41. The circuit connection of the entire row of battery cells 41 is in a serpentine layout to achieve the series connection between multiple battery cells 41 in a single row of battery cells 41; in the longitudinal direction, between two adjacent rows of battery cells (41), the positive terminal post of the last battery cell at the end of one row of battery cells 41 is arranged adjacent to and connected to the negative terminal post of the last battery cell at the same end of the other row of battery cells 41 to achieve the series connection between two adjacent rows of battery cells 41 in a single battery cell group 40.

[0055] The energy storage system 1 provided by the embodiments of the present application, through the arrangement of the battery cells 41 with the pole columns led out at the top, compared with the common battery cells 41 with the pole columns led out at the side, the longitudinal spacing distance between two adjacent battery cells 41 can be greatly reduced, saving the longitudinal space in the energy storage system 1, thereby improving the space utilization rate of the energy storage system 1; at the same time, combined with the position design of the pole columns with different polarities of multiple battery cells 41, multiple battery cells 41 can be connected in series in sequence, realizing the superposition of voltages without adding additional components, and improving the output voltage of the entire battery pack; and it helps to balance the charge distribution in the battery cell group 40, reducing the mutual influence between the battery cells 41, and further improving the stability and safety of the energy storage system 1.

[0056] In some embodiments, the accommodating structure 50 further includes: a support structure 52 and a pair of end plates 51.

[0057] As Figure 2 and Figure 6 shown, the battery cell group 40 is supported by the support structure 52, and the battery cell group 40 is located between a pair of end plates 51 in the stacking direction of multiple battery cells 41.

[0058] It can be understood that based on the fact that the pole columns of the above-mentioned battery cells 41 are located at the top of the battery cells 41, combined with the design that the accommodating structure 50 includes a support structure 52 and a pair of end plates 51, in this case, no additional plate members or straps are required on both sides of the battery cell group 40 for auxiliary support or protection, avoiding the process of assembling multiple traditional battery cells 41 into a battery module in cooperation with fixing members such as end plates 51, support structures 52, and side plates.

[0059] In actual implementation, as Figure 2 and Figure 6 shown, first connect one end plate 51 of the battery cell group 40 to one end of the support structure 52 respectively by bolts or other connection means to form an L-shaped preliminary frame, and then start stacking the battery cells 41 in this preliminary frame. The large surface of the battery cell 41 is arranged opposite to the large surface of the end plate 51. After multiple battery cells 41 are stacked to form the battery cell group 40, connect the other end plate 51 of the battery cell group 40 to the other end of the support structure 52 respectively by bolts or other connection means to form a U-shaped accommodating structure 50.

[0060] The energy storage system 1 provided by the embodiments of the present application, through the arrangement of the above-mentioned support structure 52 and a pair of end plates 51, realizes the assembly and support of the battery cell group 40, without adding plate members or straps for auxiliary support or protection, realizes the de-module design and de-pack design of the energy storage battery, reduces the complexity of design and process assembly, thereby accelerating the production rate and saving manufacturing costs at the same time.

[0061] In some embodiments, asFigure 3 and Figures 4-6 As shown in Figures 4-6 , the end plate 51 is provided with a notch 5113. The two outermost pole columns of the same battery cell group 40 in the circuit structure are respectively connected with lead-out poles 60, and the lead-out poles 60 penetrate through the notch 5113.

[0062] In this embodiment, as Figure 3 and Figures 4-6 shown, the multiple battery cells 41 in the battery cell group 40 are arranged in an even number of columns. For example, the battery cell group 40 includes two rows of battery cells 41. The multiple battery cells 41 in each row of battery cells 41 are connected in series, and the two rows of battery cells 41 are also connected in series. The positive and negative pole columns between adjacent two battery cells 41 can be arranged in a staggered manner, and the positive and negative pole columns are electrically connected through a bus bar 80. Each row of battery cells 41 is provided with a lead-out pole 60. Specifically, the positive and negative lead-out poles 60 of the two rows of battery cells 41 can be located on the same side, and the electrical energy is exported through the notch 5113 on the end plate 51 on the same side.

[0063] The energy storage system 1 provided by the embodiment of the present application realizes the avoidance of the end plate 51 for the lead-out pole 60 through the above-mentioned notch 5113 and the lead-out pole 60, which is convenient for the electrical energy export of the battery cell group 40. Moreover, the positive and negative lead-out poles 60 of the same battery cell group 40 are located on the same side, making the electrical connection more direct and efficient, reducing the intermediate links, thereby reducing the risk of electrical connection failures and contributing to the electrical connection between the battery cell groups 40.

[0064] In some embodiments, as Figure 5 shown, the two lead-out poles 60 corresponding to the same battery cell group 40 penetrate through the notch 5113 of the same end plate 51.

[0065] In this embodiment, as Figure 5 shown, the two lead-out poles 60 corresponding to the same battery cell group 40 are spaced apart. The notch 5113 can be located in the middle above the end plate 51. The battery cell group 40 can include two rows of battery cells 41. The same side of the two rows of battery cells 41 is respectively connected with its own lead-out pole 60. The lead-out pole 60 of one row of battery cells 41 can be located at the first end along the longitudinal direction of the corresponding battery cell 41, and the lead-out pole 60 of the other row of battery cells 41 can be located at the second end along the longitudinal direction of the corresponding battery cell 41. The polarities of the two lead-out poles 60 are opposite.

[0066] The energy storage system 1 provided by the embodiment of the present application, through the structural design that two lead-out electrodes 60 corresponding to the same battery cell group 40 penetrate through the notch 5113 of the same end plate 51, realizes that multiple battery cells 41 in the battery cell group 40 are arranged in an even number of columns, each column includes multiple serially connected battery cells 41 stacked in the stacking direction, and the battery cells 41 in adjacent columns are connected in series, making the electrical connection more compact, helping to reduce the length of the electrical lines inside the battery pack, reducing resistance and energy loss, and reducing the number of notches 5113 on the end plate 51, thereby simplifying the structural design of the end plate 51. At the same time, the compact layout also helps to improve the integration of the battery cell group 40, making the entire energy storage system 1 more compact and efficient.

[0067] In some embodiments, as Figure 4 shown, the top surface of the end plate 51 is higher than the top surface of the corresponding battery cell group 40.

[0068] As Figures 4-6 shown, the energy storage system 1 may further include a protective upper cover 70. The protective upper cover 70 may be made of an insulating material, such as ABS (Acrylonitrile Butadiene Styrene) or PVC (Polyvinyl Chloride), etc.

[0069] It can be understood that, as Figure 4 shown, the top surface height H1 of the end plate 51 is greater than the top surface height H2 of the battery cell group 40. In this way, a certain space can be left above the battery cell group 40 to accommodate the bus bar 80 and the protective upper cover 70. The protective upper cover 70 can be stacked on the side of the bus bar 80 facing away from the battery cell group 40, and the top surface of the protective upper cover 70 is lower than the top surface of the end plate 51. The bus bar 80 and the protective upper cover 70 can be fixed by bonding or other connection methods.

[0070] The energy storage system 1 provided by the embodiment of the present application, through the above design that the top surface of the end plate 51 is higher than the top surface of the corresponding battery cell group 40, effectively saves the height space of the energy storage system 1, enables the end plate 51 to play a two-way supporting role up and down, and the end plate 51 can fully bear the weight of the upper layer unit, so that the corresponding battery cell group 40 and the bus bar 80 are in a state of not being stressed, thereby effectively protecting the battery cell group 40 and the bus bar 80.

[0071] In some embodiments, as Figure 4 and Figures 7-8 shown, the support structure 52 includes: a liquid cooling plate 521 and a support plate 522, and the end plate 51 is connected to the support plate 522 and the liquid cooling plate 521.

[0072] The liquid cooling plate 521 is used to dissipate heat from the battery cell group 40, and the support plate 522 is used to support the weight of the upper battery cell group 40. Among them, to optimize the heat conduction effect, a thermal conductive adhesive can be provided between the bottom surface of the liquid cooling plate 521 and the battery cell group 40.

[0073] One or more support plates 522 can be provided. "Multiple" means two or more. For example, in some embodiments, as Figure 5 shown, five support plates 522 are provided.

[0074] The connection method between the liquid cooling plate 521 and the end plate 51 can include but is not limited to screw connection, snap connection, or rivet connection, etc., and there is no limitation here.

[0075] For example, in some embodiments, the connection method between the liquid cooling plate 521 and the end plate 51 is screw connection.

[0076] The connection method between the support plate 522 and the end plate 51 can include but is not limited to bolt connection, snap connection, or rivet connection, etc., and there is no limitation here.

[0077] For example, in some embodiments, the connection method between the support plate 522 and the end plate 51 is bolt connection.

[0078] The energy storage system 1 provided by the embodiment of the present application realizes the assembly and support of the battery cell group 40 through the above settings of the liquid cooling plate 521 and the support plate 522, taking into account the heat dissipation requirements and installation strength requirements of the battery cell group 40, without adding additional plates or straps for auxiliary support or protection, thereby achieving cost control.

[0079] In some embodiments, the projection of the liquid cooling plate 521 on the bottom surface of the battery cell group 40 does not coincide with the projection of the support plate 522 on the bottom surface of the battery cell group 40, and the liquid cooling plate 521 and the support plate 522 are arranged side by side.

[0080] In this embodiment, as Figures 6-7 shown, both the liquid cooling plate 521 and the support plate 522 are attached to the bottom surfaces of multiple battery cell groups 40, but the attachment areas of the liquid cooling plate 521 on the bottom surfaces of multiple battery cell groups 40 do not coincide with the attachment areas of the support plate 522 on the bottom surfaces of multiple battery cell groups 40, that is, there is no overlapping positional relationship between the liquid cooling plate 521 and the support plate 522, such that the liquid cooling plate 521 and the support plate 522 are generally in the same height range. This design enables the liquid cooling plate 521 and the support plate 522 to each perform their functions without interference. The liquid cooling plate 521 is used to cool multiple battery cells 41, while the support plate 522 provides structural support to maintain the stability of multiple battery cell groups 40.

[0081] The energy storage system 1 provided by the embodiment of the present application, through the structural design of arranging the liquid cooling plate 521 and the support plate 522 side by side, compared with the common solution of installing the support plate 522 between the bottom surfaces of multiple battery cells 41 and the liquid cooling plate 521, realizes effective cooling and support for multiple battery cell groups 40. The support plate 522 can help the liquid cooling plate 521 bear the pressure transmitted from the upper structure, extend the working life of the liquid cooling plate 521, improve the performance and stability of the battery cell group 40, and at the same time effectively save the width space and height space of the energy storage system 1. The energy storage system 1 can accommodate more battery cells 41, thereby effectively improving the overall stored power and energy density of the energy storage system 1.

[0082] In some embodiments, as Figure 5 shown, the support plate 522 includes a plurality of spaced-apart ones, and the liquid cooling plate 521 includes a plurality of sub-plates 5211 spaced apart from each other. The plurality of sub-plates 5211 and the plurality of support plates 522 are arranged in an interleaved manner.

[0083] Herein, "a plurality" means two or more. For example, in some embodiments, as Figure 5 shown, the support plate 522 includes five spaced-apart ones, and the liquid cooling plate 521 includes four sub-plates 5211 spaced apart from each other. The four sub-plates 5211 and the five support plates 522 are arranged in an interleaved manner.

[0084] In this embodiment, as Figure 5 shown, the plurality of sub-plates 5211 are spaced apart longitudinally, the plurality of support plates 522 are spaced apart longitudinally, and the plurality of sub-plates 5211 and the plurality of support plates 522 can be arranged in a one-to-one interleaved manner longitudinally. In other words, support plates 522 are provided on both sides of each sub-plate 5211.

[0085] The energy storage system 1 provided by the embodiment of the present application, through the structural design of arranging the plurality of sub-plates 5211 and the plurality of support plates 522 in an interleaved manner, makes the distribution areas of the liquid cooling plate 521 and the plurality of support plates 522 relatively uniform and reasonable, optimizes the structural layout, improves the space utilization rate, and with this structure, the plurality of support plates 522 can help the liquid cooling plate 521 bear more pressure, prevent local overloading of the liquid cooling plate 521, and thus extend the service life of the liquid cooling plate 521.

[0086] In some embodiments, as Figure 5 shown, the liquid cooling plate 521 includes at least one connecting plate 5212. The same ends of the plurality of sub-plates 5211 are connected by the connecting plate 5212. An installation groove 5213 is formed between two adjacent sub-plates 5211 and the connecting plate 5212, and support plates 522 are provided on the outer sides of the installation groove 5213 and the two outermost sub-plates 5211.

[0087] In this embodiment, as Figures 5-7As shown, the connecting plate 5212 extends longitudinally, and a plurality of sub-plates 5211 and a plurality of support plates 522 can be arranged alternately longitudinally one by one. A part of the plurality of support plates 522 can be located in a plurality of installation grooves 5213 formed by the plurality of sub-plates 5211 and the connecting plate 5212, and another part of the plurality of support plates 522 can be located outside the two outermost sub-plates 5211 longitudinally. Specifically, support plates 522 can be provided on both sides of the liquid cooling plate 521 longitudinally.

[0088] For the energy storage system 1 provided by the embodiment of the present application, through the above setting of the connecting plate 5212, a plurality of sub-plates 5211 can be connected into a whole through the connecting plate 5212, and each sub-plate 5211 does not need to be provided with a water inlet 5214 and a water outlet 5215 separately, which simplifies the manufacturing process and saves material costs while.

[0089] In some embodiments, as Figure 10 shown, the width of the outermost support plate 522 is smaller than the width of the support plate 522 located in the installation groove 5213.

[0090] In this embodiment, as Figure 10 shown, a plurality of support plates 522 can be divided into two types according to different widths, that is, simply divided into wide support plates 522 and narrow support plates 522. Among them, the wide support plates 522 are located in the installation grooves 5213 and are used to support the middle position of the bottom of a plurality of battery cell groups 40; the narrow support plates 522 are located outside the two outermost sub-plates 5211 longitudinally and are used to support the edge positions of the bottom of a plurality of battery cell groups 40.

[0091] It should be noted that the width of the above support plate 522 represents the dimension of the support plate 522 in the longitudinal direction.

[0092] For the energy storage system 1 provided by the embodiment of the present application, through the above width design of a plurality of support plates 522, based on the fact that the pressure required to be borne in the middle region is relatively large, the widths of a plurality of support plates 522 supporting the middle region are increased accordingly. Based on the fact that the pressure required to be borne in the two side regions is relatively small, the widths of a plurality of support plates 522 supporting the two side regions are designed to be slightly smaller, making an adaptive adjustment according to the stress levels in different regions, while taking into account the requirements of structural stiffness and cost savings, which is beneficial to the popularization and use of the energy storage system 11.

[0093] In some embodiments, as Figure 5 shown, one end of a plurality of sub-plates 5211 is connected with a connecting plate 5212, and the installation groove 5213 opens in a direction away from the connecting plate 5212.

[0094] In this embodiment, as Figure 5As shown, the entire support plate 522 is located within its corresponding installation groove 5213, and the installation groove 5213 opens laterally.

[0095] In some other embodiments, a part of the support plate 522 is located within its corresponding installation groove 5213, and the installation groove 5213 opens in the second direction.

[0096] In still some other embodiments, the entire support plate 522 is located within its corresponding installation groove 5213, and the opening direction of the installation groove 5213 forms an acute angle with the lateral direction.

[0097] The energy storage system 1 provided by the embodiment of the present application, through the structural design that one end of each of the above-mentioned multiple sub-boards 5211 is connected with a connecting plate 5212, realizes that the installation groove 5213 opens laterally towards one side. While the support plate 522 can more replace the liquid cooling plate 521 to bear the upper layer weight, it is convenient for the assembly and disassembly of the support plate 522 and the liquid cooling plate 521, effectively saving the width space and height space of the energy storage system 1.

[0098] In some embodiments, both ends of each of the multiple sub-boards 5211 are respectively connected with a connecting plate 5212 to form an installation groove 5213 that is closed in the horizontal direction.

[0099] Among them, the horizontal direction includes the lateral direction, the longitudinal direction, and other directions on the horizontal plane.

[0100] In this embodiment, the connecting plates 5212 all protrude outside the multiple battery cell groups 40. In other words, with the horizontal plane as the projection plane and the vertical direction as the projection direction, the projection of the connecting plates 5212 does not coincide with the projection of the bottom surfaces of the multiple battery cell groups 40.

[0101] The energy storage system 1 provided by the embodiment of the present application, through the structural design that both ends of each of the above-mentioned multiple sub-boards 5211 are respectively connected with a connecting plate 5212, realizes that the installation groove 5213 is closed in the horizontal direction. Without affecting the fixed connection between the end plate 51, the support plate 522, and the liquid cooling plate 521, the cooling capacity of the liquid cooling plate 521 per unit time is increased, thereby optimizing the cooling effect of the liquid cooling plate 521 on the multiple battery cell groups 40.

[0102] In some embodiments, as Figure 5 shown, the liquid cooling plate 521 has a water inlet 5214 and a water outlet 5215, and the water inlet 5214 and the water outlet 5215 are respectively located on the two outermost sub-boards 5211.

[0103] The liquid cooling plate 521 includes a base plate and a flow channel plate distributed vertically. After the base plate and the flow channel plate are covered, a flow channel is formed. The coolant can flow into the flow channel through the water inlet 5214, and after completing the circulation in the flow channel, it can leave the flow channel through the water outlet 5215.

[0104] As shown Figures 5-7 In the figure, the same ends of multiple sub-boards 5211 are connected to the connecting board 5212 to form a whole. The water inlet 5214 and the water outlet 5215 are respectively arranged on the two outermost sub-boards 5211 along the longitudinal direction, and the water inlet 5214 and the water outlet 5215 are located at the ends of the two sub-boards 5211 facing away from the connecting board 5212. The ends of the two sub-boards 5211 facing away from the connecting board 5212 extend to the outside of the end plate 51.

[0105] For the energy storage system 1 provided by the embodiment of the present application, through the above-mentioned position design of the water inlet 5214 and the water outlet 5215, during the process of the coolant circulating in the flow channel, it can carry away as much heat as possible, prevent heat accumulation, optimize the heat dissipation effect. At the same time, both the water inlet 5214 and the water outlet 5215 are located at the ends of the two sub-boards 5211 facing away from the connecting board 5212, which is convenient for external pipelines to be connected to the water inlet 5214 and the water outlet 5215.

[0106] In some embodiments, as shown Figure 4 in the figure, the thickness h1 of the support board 522 is greater than the thickness h2 of the liquid cooling plate 521.

[0107] It can be understood that, as shown Figure 4 in the figure, the thickness h1 of the support board 522 represents the dimension of the support board 522 in the vertical direction, and the thickness h2 of the liquid cooling plate 521 represents the dimension of the liquid cooling plate 521 in the vertical direction. The support board 522 with a larger thickness can slightly lift the bottom surface of the liquid cooling plate 521, reducing the contact between the bottom surface of the liquid cooling plate 521 and the lower layer unit or other components.

[0108] For the energy storage system 1 provided by the embodiment of the present application, through the above-mentioned design that the thickness of the support board 522 is greater than the thickness of the liquid cooling plate 521, the support board 522 can help the liquid cooling plate 521 share the pressure transmitted from the upper structure to the maximum extent, further extend the service life of the liquid cooling plate 521, and at the same time increase the structural stiffness of multiple battery cell groups 40.

[0109] In some embodiments, as shown Figure 11 in the figure, the support board 522 has a weight reduction cavity 5221.

[0110] As shown Figure 11 in the figure, the weight reduction cavity 5221 can extend along the transverse direction, and multiple weight reduction cavities 5221 can be provided. The term "multiple" means two or more, and there is no limitation here.

[0111] For example, in some embodiments, as shown Figure 11 in the figure, the support board 522 has four weight reduction cavities 5221.

[0112] Among them, the shape of the weight reduction cavity 5221 may include, but is not limited to, square, triangular, circular or polygonal, etc., and is not limited here.

[0113] For example, in some embodiments, as Figure 11 shown, the shape of the weight reduction cavity 5221 is square.

[0114] The energy storage system 1 provided by the embodiment of the present application, through the above-mentioned setting of the weight reduction cavity 5221, reduces the self-weight of the support plate 522 without affecting the bearing capacity of the support plate 522 itself, and realizes the overall miniaturization and lightweight design.

[0115] In some embodiments, as [[ID= shown, the end plate 51 includes an end plate body 511 and a flanging 512 that is folded in a direction away from the battery cell group 40, and at least one of the end plate body 511 and the flanging 512 is connected to the support plate 522.

[0116] As ​ shown, the end plate body 511 and the flanging 512 are integrally formed, and a right angle can be formed between the end plate body 511 and the flanging 512. In other words, the end plate 51 is integrally L-shaped.

[0117] In this embodiment, as ​ and ​ shown, the support plate 522 can be connected to the flanging 512 by bolts or other connection methods. Specifically, both ends of the support plate 522 can be respectively connected to the flangings 512 of a pair of end plates 51 located at both ends of the battery cell group 40.

[0118] In some other embodiments, the support plate 522 can be connected to the end plate body 511 by bolts or other connection methods.

[0119] In still some other embodiments, the support plate 522 can be connected to the flanging 512 and the end plate body 511 by bolts or other connection methods.

[0120] The energy storage system 1 provided by the embodiment of the present application, through the above-mentioned setting of the end plate body 511 and the flanging 512, increases the edge thickness and stiffness of the end plate 51, so that the end plate 51 can withstand greater pressure and impact force, helps to reduce the deformation and damage of the end plate 51 when subjected to external impact or vibration, and protects the safety of the battery cell group 40; combined with the structural design of the connection between the flanging 512 and the support plate 522, more installation interfaces and fixing points can be provided, thereby increasing the connection strength and reliability of the support plate 522.

[0121] In some embodiments, as ​ shown, the energy storage system 1 further includes: a connecting rod 30.

[0122] As shown ​ in the figure, the end plate body 511 and the support plate 522 are connected by a connecting rod 30.

[0123] The assembly method of the connecting rod 30 may include but is not limited to bolt connection, snap connection or pin connection, etc., and is not limited here.

[0124] For example, in some embodiments, as ​ shown in the figure, the assembly method of the connection is bolt connection.

[0125] In actual implementation, as ​ shown in the figure, the connecting rod 30 can vertically penetrate the end plate body 511 and the support plate 522. Specifically, the end plate body 511 may have at least one connection hole, and the support plate 522 may also have at least one connection hole, and the connection holes of the end plate body 511 and the connection holes of the support plate 522 are arranged opposite to each other vertically, and the connecting rod 30 can vertically penetrate the connection holes of the end plate body 511 and the connection holes of the support plate 522.

[0126] In the energy storage system 1 provided by the embodiment of the present application, through the setting of the above-mentioned connecting rod 30, the connecting rod 30, as a connecting member between the end plate body 511 and the support plate 522, can further enhance the connection strength between the end plate body 511 and the support plate 522, make the structure of the entire energy storage system 1 more stable, and increase the convenience of assembly and disassembly, thereby increasing the maintainability of the energy storage system 1.

[0127] In some embodiments, as ​ and ​ shown in the figure, there are a plurality of first cavities 5111 in the end plate body 511, and first reinforcing ribs 5112 are provided between adjacent cavities, and the connecting rod 30 penetrates through the first reinforcing ribs 5112.

[0128] The end plate 51 can be processed by an extrusion molding method. Among them, the shape of the first cavity 5111 may include but is not limited to square, triangular, circular or polygonal, etc., and is not limited here.

[0129] For example, in some embodiments, as ​ shown in the figure, the shape of the first cavity 5111 is square.

[0130] As ​ shown in the figure, there are a plurality of second cavities 5121 inside the flanging 512, and second reinforcing ribs 5122 are provided between adjacent cavities.

[0131] Among them, the shape of the second cavity 5121 may include but is not limited to square, triangular, circular or polygonal, etc., and is not limited here.

[0132] For example, in some embodiments, such as ​ shown, the shape of the second cavity 5121 is square.

[0133] Such as ​ shown, the first reinforcing rib 5112 can extend longitudinally and be supported on the inner wall surface of the end plate body 511. A plurality of first reinforcing ribs 5112 are distributed at intervals in the vertical direction. Connecting holes can be provided on each of the plurality of first reinforcing ribs 5112, and the connecting holes on each first reinforcing rib 5112 are arranged opposite to each other in the vertical direction. The connecting rod 30 can penetrate through the connecting holes of the plurality of reinforcing ribs in the vertical direction.

[0134] The energy storage system 1 provided by the embodiment of the present application, through the above settings of the first cavity 5111 and the first reinforcing rib 5112, reduces the self-weight of the end plate 51 without affecting the structural strength of the end plate 51 itself, so as to resist the large-area expansion of the battery cell 41, and a through connecting hole is provided on the first reinforcing rib 5112 to increase the connection points between the connecting rod 30 and the end plate 51, thereby significantly enhancing the bonding force between the connecting rod 30 and the end plate 51, and further improving the stability and reliability of the entire energy storage system 1.

[0135] In some embodiments, such as ​ shown, a plurality of battery cell groups 40 are distributed in the horizontal direction, and the end plates 51 corresponding to two adjacent battery cell groups 40 are connected to the same support plate 522.

[0136] Among them, the horizontal direction includes the transverse direction, the longitudinal direction, and other directions on the horizontal plane, and a plurality means two or more.

[0137] In this embodiment, such as ​ shown, two battery cell groups 40 are distributed in the longitudinal direction, and the two battery cell groups 40 are connected in series, and there is one support plate 522 among the plurality of support plates 522 that is connected to the two end plates 51 corresponding to the two battery cell groups 40. In other words, at least part of this support plate 522 is located directly below one of the battery cell groups 40, and at least part of this support plate 522 is also located directly below the other battery cell group 40.

[0138] The energy storage system 1 provided by the embodiment of the present application, through the above structural design in which a plurality of battery cell groups 40 are distributed in the horizontal direction, can flexibly adjust the number of battery cell groups 40 to meet the design requirements of energy storage systems 1 with different capacities; at the same time, by connecting the end plates 51 of adjacent battery cell groups 40 to the same support plate 522, a stable structural framework can be formed. This design enhances the connection strength between the battery cell groups 40, making the entire energy storage system 1 more stable when subjected to external forces and not easily deformed or damaged.

[0139] In some embodiments, such as ​As shown, multiple layers of battery cell groups 40 are distributed in the vertical direction.

[0140] Among them, multiple layers means two or more layers. For example, in some embodiments, as ​ shown, eight layers of battery cell groups 40 are distributed in the vertical direction.

[0141] In actual implementation, as ​ shown, multiple battery cells 41 are stacked horizontally to form a single row of battery cells 41, and two rows of battery cells 41 are arranged at intervals longitudinally to form a battery cell group 40. At this time, since the pole columns are led out from the top, the distance between adjacent two rows of battery cells 41 does not need to consider the safety distance of the pole columns during design, that is, the distance between adjacent two rows of battery cells 41 can be designed to be relatively close. Two battery cell groups 40 are arranged at intervals longitudinally to form a single layer of battery cells 41, and finally multiple layers of battery cells 41 are stacked vertically.

[0142] The energy storage system 1 provided by the embodiment of the present application, through the design of the stacking levels of the above-mentioned battery cells 41 from individual to row, then to battery cell group 40, and finally to layer, enables the energy storage system 1 to have good scalability. Whether it is increasing the number, increasing the number of rows, increasing the number of groups, or increasing the number of layers, it can easily achieve the expansion of the energy storage capacity. At the same time, the modularization design and pack design of the energy storage battery are realized, reducing the complexity of design and process assembly, thereby accelerating the production rate. In addition, this vertical stacking can further improve the energy storage density without increasing the floor area of the energy storage system 1.

[0143] In some embodiments, as ​ shown, the end plates 51 and the accommodating structures 50 corresponding to each layer of battery cell groups 40 are connected by connecting rods 30 extending in the vertical direction.

[0144] It can be understood that, as ​ shown, multiple layers of battery cells 41 are stacked vertically. After stacking, the connecting rods 30 can be vertically penetrated through the end plates 51 and the support plates 522 of each layer of battery cells 41, and finally tightened and fixed at both ends of the connecting rods 30 by nuts or other fasteners, so that the multiple layers of battery cells 41 stacked vertically are integrated into a whole.

[0145] The energy storage system 1 provided by the embodiment of the present application, through the structural design that the end plates 51 corresponding to each layer of battery cell groups 40 and the accommodating structure 50 are connected by the connecting rods 30 extending in the vertical direction, enables the multi-layer battery cells 41 arranged in a vertical stack to form a rigid body with a stable structure. While improving the integration and reliability of the multi-layer battery cells 41, it is convenient for rapid assembly and maintenance. At the same time, it further realizes the design of removing modules and the design of removing packs, without overly redundant accessories, materials, and manufacturing processes, saving the production and manufacturing costs. In addition, the layered design is simple, saving the longitudinal space in the energy storage system 1 and enabling more battery cells 41 to be accommodated, thereby effectively improving the overall stored power and energy density of the energy storage system 1.

[0146] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0147] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0148] In the description of the present application, the "first feature" and "second feature" may include one or more of such features.

[0149] In the description of the present application, the meaning of "a plurality" is two or more.

[0150] In the description of the present application, that the first feature is "above" or "below" the second feature may include direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through additional features therebetween.

[0151] In the description of the present application, the first feature being "above", "over" or "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature.

[0152] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0153] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage system, characterized in that, Comprising: Cabinet body; At least one battery cell group, arranged in the cabinet body, comprising a plurality of battery cells, and the pole posts of the battery cells are located at the tops of the battery cells; within the same battery cell group, the polarities of the relatively arranged pole posts between two adjacent battery cells are opposite, and the battery cells are connected in series in sequence; Receiving structure, the battery cell group is installed in the receiving structure, the receiving structure comprises a support structure and a pair of end plates, the battery cell group is supported by the support structure and is located between the pair of end plates in the stacking direction of the plurality of battery cells, the end plates are provided with notches, and the two outermost pole posts of the same battery cell group in the circuit structure are respectively connected with lead-out poles, and the lead-out poles penetrate through the notches.

2. The energy storage system according to claim 1, wherein The two lead-out poles corresponding to the same battery cell group penetrate through the notches of the same end plate.

3. The energy storage system according to claim 1, characterized in that The top surface of the end plate is higher than the top surface of the corresponding battery cell group.

4. The energy storage system according to claim 1, wherein The support structure comprises: a liquid cooling plate and a support plate, and the end plate is connected to the support plate and the liquid cooling plate.

5. The energy storage system according to claim 4, wherein The end plate comprises an end plate body and a flanging portion which is turned over in a direction away from the battery cell group, and at least one of the end plate body and the flanging portion is connected to the support plate.

6. The energy storage system according to claim 5, wherein Further comprising: Connecting rod, the end plate body and the support plate are connected through the connecting rod.

7. The energy storage system according to claim 6, characterized in that, The end plate body has a plurality of first cavities, and first reinforcing ribs are arranged between adjacent cavities, and the connecting rod penetrates through the first reinforcing ribs.

8. The energy storage system according to claim 4, characterized in that A plurality of battery cell groups are distributed in the horizontal direction, and the end plates corresponding to two adjacent battery cell groups are connected to the same support plate.

9. The energy storage system according to any one of claims 1-8, characterized in that, The battery cell groups are distributed in multiple layers in the vertical direction.

10. The energy storage system according to claim 9, characterized in that, The end plates corresponding to each layer of battery cell groups and the receiving structure are connected through connecting rods extending in the vertical direction.

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