Battery pack and energy storage cabinet

Abstract

The utility model provides a battery pack and an energy storage cabinet. The battery pack comprises a shell and a plurality of liquid cooling plates sequentially arranged in the first direction. The liquid cooling plate forms a plurality of containing grooves which are sequentially arranged in the second direction. And a battery cell is accommodated in each accommodating groove. The battery cell comprises four side surfaces which are connected in sequence; wherein two side faces are oppositely arranged in the first direction, the other two side faces are oppositely arranged in the second direction, the area of the two side faces is larger than that of the other two side faces, and the two side faces and one side face of the other two side faces are arranged towards the inner wall of the containing groove. And a partition plate is arranged between every two adjacent liquid cooling plates. And the three side surfaces of the battery cell and the inner wall of the accommodating groove are subjected to heat transfer, so that the heat transfer area of the battery cell and the liquid cooling plate can be increased, and the heat dissipation efficiency and the heat dissipation effect are improved. The top and the bottom of the battery cell are in heat transfer with the liquid cooling plate through the side surfaces, so that uniform-temperature heat dissipation of the battery cell is realized, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery pack and an energy storage cabinet. Background Art

[0002] Lithium batteries have the characteristics of high energy density and long cycle life, and are widely used in energy storage, electric vehicles, and backup power. The battery pack of lithium batteries generates a lot of heat during the charging and discharging process. Overheating will accelerate the side reactions of the battery cells inside the battery pack, reducing the performance and service life of the battery. Therefore, a heat dissipation system is usually installed inside the battery pack to cool the battery cells of the battery pack.

[0003] The current heat dissipation methods mainly include air cooling and liquid cooling. Among them, liquid cooling has become the mainstream design due to its high heat exchange rate and low failure rate. For square battery packs, bottom cooling is usually used. This cooling method has poor cooling effect on the upper part of the battery cell, resulting in a large temperature difference between the upper and lower parts of the battery cell, and poor overall heat dissipation capacity.

[0004] In addition, energy storage application scenarios require batteries with larger capacity, which increases the thermal safety risk of energy storage. Battery packs with stronger heat dissipation performance can effectively reduce the risk of thermal runaway. Therefore, it is crucial to design a low-cost, high-safety uniform temperature heat dissipation solution. Utility Model Content

[0005] The present application provides a battery pack and an energy storage cabinet to achieve uniform temperature heat dissipation of the battery pack, thereby improving the heat dissipation efficiency and service life of the battery pack.

[0006] In a first aspect, the present application provides a battery pack. The battery pack specifically includes a plurality of liquid cooling plates. Specifically, the aforementioned plurality of liquid cooling plates are arranged in sequence along a first direction. In the aforementioned plurality of liquid cooling plates, each liquid cooling plate forms a plurality of receiving grooves. The aforementioned plurality of receiving grooves are arranged in sequence along a second direction, and each of the aforementioned plurality of receiving grooves receives a battery cell, and the second direction is perpendicular to the first direction. For each battery cell, the battery cell includes four side surfaces connected in sequence, two of the four side surfaces are arranged relative to each other along a first direction, and the other two side surfaces are arranged relative to each other along a second direction, the area of ​​the aforementioned two side surfaces is greater than the area of ​​the aforementioned other two side surfaces, and the aforementioned two side surfaces and one of the aforementioned two other side surfaces are respectively arranged toward the inner wall of the receiving groove. In the aforementioned plurality of liquid cooling plates, a partition is also arranged between any two adjacent liquid cooling plates, and the partition is used to separate the battery cells between two adjacent liquid cooling plates.

[0007] In the battery pack of the present application, each liquid cooling plate forms a plurality of receiving grooves arranged in sequence along the second direction. Each receiving groove can accommodate a battery cell, and the three sides of the battery cell can transfer heat with the inner wall of the receiving groove, thereby increasing the heat transfer area between the battery cell and the liquid cooling plate, and thus improving the heat dissipation efficiency and effect. In addition, the side of the battery cell is connected between the top and bottom surfaces of the battery cell, so that the heat at the top and bottom of the battery cell can be transferred to the liquid cooling plate through the side, thereby achieving uniform temperature of the battery cell from top to bottom. Among them, in each battery cell, the two sides with larger areas among the four sides directly transfer heat with the liquid cooling plate, which can reduce the risk of heat spreading along the large surface of the battery cell when the battery pack is in thermal runaway. In addition, along the first direction, two adjacent liquid cooling plates are separated by a partition, which can reduce the heat transfer of the battery cell between the two adjacent liquid cooling plates.

[0008] In a possible implementation, the number of receiving slots of the two adjacent liquid cooling plates is equal, and the projections of the receiving slots of the two adjacent liquid cooling plates along the first direction overlap. In other words, the multiple liquid cooling plates in the battery pack are exactly the same, which is conducive to large-scale manufacturing.

[0009] In a possible implementation, the opening directions of the two receiving grooves overlapped by the projections of two adjacent liquid cooling plates along the first direction can be in the same direction. In this way, the other side of the aforementioned other two side surfaces of the battery cell can be arranged toward the outer wall of the receiving groove of the adjacent liquid cooling plate, so that the battery cells of the two adjacent liquid cooling plates are always separated by the wall of the receiving groove, which is conducive to improving the heat dissipation efficiency. In this implementation, the partition can be a heat insulation plate, which is arranged opposite to the aforementioned other side surface of the battery cell, so that most of the heat of the battery cell is transferred to the liquid cooling plate that accommodates the battery cell through the remaining three side surfaces, wherein the thermal conductivity of the heat insulation plate is less than or equal to 0.1. Of course, the partition can also be a heat conducting plate, one side surface of the heat conducting plate is arranged opposite to the aforementioned other side surface of the battery cell, and the other side surface is arranged opposite to the outer wall of the receiving groove of the adjacent liquid cooling plate, so that part of the heat of the battery cell can also be transferred to the adjacent liquid cooling plate through the heat conducting plate. Wherein, the thermal conductivity of the heat conducting plate is greater than or equal to 10.

[0010] In a possible implementation, the opening directions of the two receiving grooves where the projections of the two adjacent liquid cooling plates overlap along the first direction may also be opposite. In this way, in the above two receiving grooves, the other side of the other two side surfaces of the two battery cells is arranged opposite to each other. In this implementation, the partition is a heat insulation board, which is used to prevent heat transfer between the other two opposite side surfaces. The thermal conductivity of the heat insulation board is less than or equal to 0.1.

[0011] In a possible implementation, a partition is specifically provided, and the partition may include a plurality of flat plates, which are sequentially arranged along the second direction.

[0012] The above-mentioned multiple flat plates may be independent flat plates, or may be an integrated structure.

[0013] The opening directions of the two adjacent receiving grooves in the above liquid cooling plate are opposite, and after the battery cell is received in the receiving groove, a side surface of the liquid cooling plate along the first direction and the side surface of the battery cell may form an uneven surface. In a possible implementation, along the first direction, the sum of the thickness of the battery cell and the thickness of the plate is greater than or equal to the depth of the receiving groove, so that the gap between the two adjacent liquid cooling plates can be equal.

[0014] In a possible implementation, the thicknesses of the plurality of flat plates along the first direction may be equal, and along the second direction, projections of two adjacent flat plates among the plurality of flat plates partially overlap, that is, the two adjacent flat plates are staggered along the second direction.

[0015] While improving the heat dissipation efficiency of the liquid cooling plate on the battery cell, in order to facilitate the operation on the top surface of the battery cell, in a possible implementation, along the third direction, the height of the liquid cooling plate is greater than two-thirds of the height of the battery cell and less than or equal to the height of the battery cell. In this application, the height of the battery cell refers to the distance between the bottom surface and the top surface of the battery cell.

[0016] In a possible implementation, each liquid cooling plate may be arranged in a bent structure to form the above-mentioned multiple receiving grooves. In each liquid cooling plate, any two adjacent receiving grooves in the above-mentioned multiple receiving grooves have opening directions opposite to each other.

[0017] In a possible implementation, each liquid cooling plate is provided with a cooling channel. Each liquid cooling plate is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the cooling channel of the liquid cooling plate. In this implementation, along the second direction, the inlet and the outlet can be respectively located on both sides of the liquid cooling plate, or the inlet and the outlet can also be located on the same side of the liquid cooling plate, which is not limited here.

[0018] In a possible implementation, a projection of the cooling channel along a third direction is arranged in an S shape, and the third direction is perpendicular to a plane where the first direction and the second direction are located.

[0019] In a possible implementation, the projection of the cooling channel along the first direction may also be arranged in an S shape, so that the cooling channel can be arranged as one cooling channel, which is convenient for uniformly controlling the flow rate of the coolant in the cooling channel.

[0020] In one possible implementation, there may be multiple cooling channels. These cooling channels are arranged in parallel along the third direction. Each liquid cooling plate is provided with multiple inlets and multiple outlets. Along the second direction, the aforementioned multiple inlets are located on one side of the liquid cooling plate, and the aforementioned multiple outlets are located on the other side of the liquid cooling plate. Among them, the aforementioned multiple inlets are connected one-to-one with the aforementioned multiple cooling channels of the liquid cooling plate, and the aforementioned multiple outlets are connected one-to-one with the aforementioned multiple cooling channels of the liquid cooling plate. Therefore, in each liquid cooling plate, each cooling channel may be provided with an inlet and an outlet accordingly, so that the flow rate of a single cooling channel can be controlled.

[0021] In another possible implementation, there may be multiple cooling channels. These cooling channels are arranged in parallel along the third direction. Along the second direction, one end of each liquid cooling plate is provided with a header and an inlet, and the other end is provided with another header and an outlet. Among them, the aforementioned one header is connected to the inlet, and the one header is connected to the above-mentioned multiple cooling channels. The aforementioned other header is connected to the outlet, and the other header is connected to the above-mentioned multiple cooling channels. By connecting the above-mentioned multiple cooling channels in parallel through the header, uniform flow distribution of each cooling channel can be achieved.

[0022] In addition to being arranged in a bent structure, in another possible implementation, each liquid cooling plate of the present application may include a main liquid cooling plate and a plurality of sub-liquid cooling plates. The main liquid cooling plate extends along the second direction, the aforementioned plurality of sub-liquid cooling plates extend along the first direction, and the plurality of sub-liquid cooling plates are arranged at intervals along the second direction. In each liquid cooling plate, two adjacent sub-liquid cooling plates and a portion of the main liquid cooling plate form a receiving groove, and the opening directions of the two adjacent receiving grooves are the same.

[0023] In a possible implementation, the main liquid cooling plate is provided with a first cooling channel, each sub-liquid cooling plate is provided with a second cooling channel, and the first cooling channel is connected to the second cooling channel. The inlet and outlet of the first cooling channel are located on the same side of the main liquid cooling plate, and the inlet and outlet of the second cooling channel are located on the side of the sub-liquid cooling plate close to the main liquid cooling plate. In this way, the coolant enters from the inlet of the first cooling channel and circulates in the first cooling channel, and also circulates in the second cooling channel during the circulation process, and finally flows out from the outlet of the first cooling channel.

[0024] In a second aspect, the present application provides an energy storage cabinet. The energy storage cabinet includes a cabinet, a refrigeration unit, and a plurality of battery packs according to the first aspect above. The refrigeration unit and the plurality of battery packs are located in the cabinet, and the liquid cooling plate of each battery pack is connected to the refrigeration unit. In the energy storage cabinet of the present application, the liquid cooling plate in the battery pack can achieve uniform temperature of the upper and lower parts of the battery cell, thereby improving the heat dissipation efficiency and heat dissipation effect, and realize uniform temperature heat dissipation of the battery pack, thereby improving the safety and reliability of the energy storage cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present application;

[0026] Figure 2 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0027] Figure 3 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0028] Figure 4 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0029] Figure 5 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0030] Figure 6 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0031] Figure 7 A schematic diagram of a partition provided in an embodiment of the present application;

[0032] Figure 8 Another schematic diagram of a liquid cooling plate provided in an embodiment of the present application;

[0033] Fig. 9 Another schematic diagram of a liquid cooling plate provided in an embodiment of the present application;

[0034] Fig.10 Another schematic diagram of a liquid cooling plate provided in an embodiment of the present application;

[0035] Fig.11 Another schematic diagram of a liquid cooling plate provided in an embodiment of the present application;

[0036] Fig.12 Another schematic diagram of the liquid cooling plate provided in an embodiment of the present application.

[0037] Reference numerals:

[0038] 10-Battery Pack

[0039] 11-Liquid cooling plate

[0040] 12-Battery Cell

[0041] 13-Partition

[0042] 14-Connection row

[0043] 111-Accommodation slot

[0044] 112-Main Liquid Cold Plate

[0045] 113-Sub Liquid Cold Plate

[0046] 114-Cooling channel

[0047] 115-Import

[0048] 116-Exit

[0049] 117-Manifold

[0050] 131-Tablet

[0051] 1141-First cooling channel

[0052] 1142-Second cooling channel

[0053] S1-First side

[0054] S2-Second side DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0056] It should be noted that the terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context.

[0057] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0058] In order to facilitate the understanding of the battery pack provided in the embodiment of the present application, its application scenario is explained below. The battery pack of the present application can be used in scenarios such as home energy storage, industrial energy storage, data centers, vehicles, etc., for storing and releasing electrical energy. In practical applications, in order to enable the battery pack to store more electrical energy, the battery pack can generally include multiple battery cells. In order to reduce the size of the battery pack, the position layout of multiple battery cells will be relatively compact. During the process of charging and discharging the battery pack, the battery cells will generate heat. In order to avoid excessive temperature, a heat dissipation structure can be set in the battery pack.

[0059] At present, battery packs usually adopt bottom heat dissipation. Specifically, the battery pack includes a shell and a plurality of battery cells, and the plurality of battery cells are located in the shell. The battery pack also includes a liquid cooling plate, which is attached to the bottom surface of the battery cell and fixed to the shell. Among them, the battery cell includes a top surface, a bottom surface and four side surfaces, the top surface is the surface where the electrode is located, the bottom surface is the surface opposite to the top surface, and the four side surfaces are connected in sequence and are located between the top surface and the bottom surface. Using the bottom heat dissipation method, the liquid cooling plate's heat dissipation rate for the bottom of the battery cell is greater than the heat dissipation rate for the top of the battery cell, resulting in uneven heat dissipation of the battery cell, which can easily cause thermal runaway of the battery pack, and the heat generated during the thermal runaway process can easily spread along the large surface of the battery cell.

[0060] Therefore, the present application provides a battery pack and an energy storage cabinet to achieve uniform temperature heat dissipation of the battery pack, thereby improving the heat dissipation efficiency and service life of the battery pack.

[0061] In one application scenario, the energy storage cabinet includes a cabinet, a refrigeration unit and a plurality of battery packs. The refrigeration unit and the plurality of battery packs are arranged in the cabinet. A heat dissipation system is provided in each battery pack, and the heat dissipation system of each battery pack is respectively connected to the refrigeration unit, so that the heat dissipation of the plurality of battery packs is uniformly controlled by the refrigeration unit. Specifically, in the cabinet, the plurality of battery packs may be a plurality of battery clusters arranged in sequence along the length direction of the cabinet, and each battery cluster includes a plurality of battery packs arranged in sequence along the height direction of the cabinet. In this embodiment, the battery pack is a square battery pack. Of course, in actual applications, the shape of the battery pack may also be other shapes, such as round or anisotropic.

[0062] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present application, Figure 2 Another schematic diagram of a battery pack provided in an embodiment of the present application, wherein: Figure 1 and Figure 2 The outer shell of the battery pack is omitted respectively. Figure 2 for Figure 1 An exploded view of the battery pack. Figure 1 and Figure 2As shown, the battery pack 10 includes an outer shell (not shown in the figure) and a plurality of liquid cooling plates 11 located in the outer shell. In the battery pack 10, a plurality of liquid cooling plates 11 are arranged in sequence along a first direction. Each of the aforementioned plurality of liquid cooling plates 11 extends along a second direction, and forms a plurality of receiving grooves 111 arranged in sequence along the second direction, and the second direction is perpendicular to the first direction. The receiving grooves 111 are used to receive battery cells 12. In addition, along the first direction, a partition 13 is also provided between any two adjacent liquid cooling plates 11 among the aforementioned plurality of liquid cooling plates 11, and the partition 13 is used to separate the battery cells 12 between the two adjacent liquid cooling plates 11. Figure 1 and Figure 2 The illustrated embodiment only shows two liquid cooling plates 11 and two columns of battery cells 12 for illustration, but the number of the liquid cooling plates 11 and the battery cells 12 is not limited.

[0063] Figure 3 Another schematic diagram of a battery pack provided in an embodiment of the present application, Figure 4 Another schematic diagram of a battery pack provided in an embodiment of the present application. Figure 3 and Figure 4 As shown, when the battery cell 12 is a square battery cell, the battery cell 12 includes a top surface and a bottom surface that are relatively arranged, and four side surfaces that are vertically connected between the top surface and the bottom surface, and the four side surfaces are connected in sequence. Among them, the four side surfaces include two first side surfaces S1 that are relatively arranged, and two second side surfaces S2 that are relatively arranged, and the area of ​​the first side surface S1 is larger than the second side surface S2, that is, the first side surface S1 is the large surface of the battery cell 12. In an embodiment of the present application, a first side surface S1 and two second side surfaces S2 of the battery cell 12 are respectively arranged toward the inner wall of the receiving groove 111 to transfer heat to the liquid cooling plate 11 through the inner wall of the receiving groove 111. Specifically, the first side surface S1 and the second side surface S2 can be attached to the inner wall of the thermal conductive adhesive receiving groove 111. That is to say, after a plurality of battery cells 12 are arranged in the receiving groove 111, thermal conductive adhesive can be filled in the gap between the battery cell 12 and the receiving groove 111, so that the battery cell 12 and the liquid cooling plate 11 are relatively fixed.

[0064] In actual production, the manufacturing process of the liquid cooling plate 11 is not limited, for example, it is made by processes such as blowing or brazing. In the embodiment of the present application, taking the square battery cell as an example, the liquid cooling plate 11 forms a receiving groove 111 for heat transfer with the three sides of the battery cell 12, thereby forming a multi-faceted structure for heat dissipation of the battery cell 12, and the first side S1 (large surface) of the battery cell 12 is heat transferred with the liquid cooling plate 11, so that the heat transfer area between the liquid cooling plate 11 and the battery cell 12 can be increased, thereby improving the heat dissipation efficiency and heat dissipation effect, and at the same time, it can also reduce the risk of heat spreading along the large surface of the battery cell 12 when the battery pack 10 is in thermal runaway. In addition, the side of the battery cell 12 is heat transferred with the liquid cooling plate 11, so that the top and bottom of the battery cell 12 can be heat transferred to the liquid cooling plate 11, thereby achieving uniform temperature heat dissipation of the battery cell 12 from top to bottom, which is beneficial to improving the service life of the battery cell 12.

[0065] Of course, in another embodiment, the two first side surfaces S1 and one second side surface S2 of the battery cell 12 can transfer heat to the inner wall of the accommodating groove 111, that is, the large surface of the battery cell 12 transfers heat to the liquid cooling plate 11, which can further increase the contact area between the battery cell 12 and the liquid cooling plate 11.

[0066] like Figure 4 As shown, in one embodiment, the liquid cooling plate 11 is arranged in a bent structure, and forms a plurality of receiving grooves 111 arranged in sequence along the second direction. In each liquid cooling plate 11, the opening directions of any two adjacent receiving grooves 111 are arranged in opposite directions. Figure 1 and Figure 2 As shown, in each liquid cooling plate 11 , another first side surface S1 of a portion of the plurality of battery cells 12 accommodated therein is arranged opposite to an adjacent liquid cooling plate 11 , and the heat of the other first side surface S1 can be dissipated through the adjacent liquid cooling plate 11 .

[0067] Figure 5 Another schematic diagram of a battery pack provided in an embodiment of the present application, wherein: Figure 5 for Figure 1 Schematic diagram of the battery pack along the third direction. Figure 5 As shown, in one embodiment, the number of receiving slots 111 of two adjacent liquid cooling plates 11 is equal, and the projections of the receiving slots 111 of the two adjacent liquid cooling plates 11 along the first direction can overlap. In other words, the liquid cooling plates 11 in the battery pack 10 are completely the same, which is conducive to large-scale manufacturing.

[0068] In the above embodiment, in the receiving grooves 111 of two adjacent liquid cooling plates 11, the opening directions of the two receiving grooves 111 whose projections overlap along the first direction can be in the same direction along the first direction. In this way, the other first side surface S1 of the battery cell 12 can be arranged opposite to the outer wall of the receiving groove 111 of the adjacent liquid cooling plate 11, so that the battery cells 12 of the two adjacent liquid cooling plates 11 are always separated by the wall of the receiving groove 111, which is beneficial to improve the heat dissipation efficiency. Of course, according to the actual shape and size of the battery pack 10, the opening directions of the two receiving grooves 111 whose projections overlap along the first direction of the above-mentioned two adjacent liquid cooling plates 11 can also be opposite to each other along the first direction, which is not limited here. Specifically, a partition 13 is provided between the two opposite battery cells 12 of the two adjacent liquid cooling plates 11, or the wall of the receiving groove 111, the partition 13 and the wall of the receiving groove 111 can be provided in sequence along the first direction between the two battery cells 12.

[0069] In another specific embodiment, when the opening directions of two overlapping receiving grooves 111 along the first direction are in the same direction, the first side surface S1 of the battery cell 12 in each receiving groove 111 faces the adjacent liquid cooling plate 11 or housing.

[0070] Figure 6 Another schematic diagram of a battery pack provided in an embodiment of the present application. Figure 6 As shown, in another embodiment, among the multiple receiving grooves 111 of the liquid cooling plate 11, the opening directions of two adjacent receiving grooves 111 are the same. Specifically, the liquid cooling plate 11 includes a main liquid cooling plate 112 and a plurality of sub-liquid cooling plates 113. Among them, the main liquid cooling plate 112 extends along the second direction, the above-mentioned multiple sub-liquid cooling plates 113 extend along the first direction, and these sub-liquid cooling plates 113 are arranged at intervals along the second direction. In each liquid cooling plate 11, any two adjacent sub-liquid cooling plates 113 and a part of the main liquid cooling plate 112 form a receiving groove 111, and the opening directions of any two adjacent receiving grooves 111 in the liquid cooling plate 11 are the same. In two adjacent liquid cooling plates 11, the other first side surface S1 of the battery cell 12 accommodated by one of the liquid cooling plates 11 is arranged opposite to the main liquid cooling plate 112 of the other liquid cooling plate 11.

[0071] In an embodiment of the present application, the partition 13 may be a heat-conducting plate, the thermal conductivity of which is greater than or equal to 10. Alternatively, the partition 12 may also be a heat-insulating plate, the thermal conductivity of which is less than or equal to 0.1. Specifically, in one embodiment, the other first side surface S1 of the battery cell 12 is arranged opposite to the outer wall of the receiving groove 111 of the adjacent liquid-cooling plate 11, that is, the partition 13 and a part of the liquid-cooling plate 11 are arranged in sequence between the two battery cells 12 arranged opposite to each other between the two adjacent liquid-cooling plates 11. In this embodiment, the partition 13 may be a heat-insulating plate, so that most of the heat of the battery cell 12 is transferred to the liquid-cooling plate 11 accommodating the battery cell 12 through the remaining three sides. Alternatively, the partition 13 may also be a heat-conducting plate, one side surface of which is arranged opposite to the other first side surface S1 of the battery cell 12, and the other side surface is arranged opposite to the outer wall of the receiving groove 111 of the adjacent liquid-cooling plate 11, and part of the heat of the battery cell 12 may also be transferred to the adjacent liquid-cooling plate 11 through the heat-conducting plate. In another embodiment, the other first side surface S1 of the battery cell 12 is arranged opposite to the other first side surface S1 of the battery cell 112 of the adjacent liquid cooling plate 11, that is, a partition 13 is provided between two battery cells 12 arranged opposite to each other between two adjacent liquid cooling plates 11. In this embodiment, the partition 13 is a heat insulation plate, which is used to prevent heat transfer between the other two opposite first side surfaces S1.

[0072] like Figure 2 As shown, the partition 13 may include a plurality of flat plates 131. These flat plates 131 are arranged in sequence along the second direction. In a specific embodiment, when the opening directions of two receiving grooves 111 overlapping the projections along the first direction are opposite along the first direction, there are two receiving grooves 111 with openings facing each other between two adjacent liquid cooling plates 11. A flat plate 131 may be arranged between the two receiving grooves 111 with openings facing each other. In addition, along the first direction, in the two liquid cooling plates 11 located at both ends, the receiving grooves 111 with openings facing away from the liquid cooling plates 11 may also be provided with flat plates 131. Therefore, in this embodiment, the above-mentioned multiple flat plates 131 may be independently arranged flat plates 131. In a specific embodiment, the above-mentioned multiple flat plates 131 may be an integrated structure.

[0073] In the above embodiment, the thicknesses of the plurality of flat plates 131 of the separator 13 along the first direction may be different. Figure 7 A schematic diagram of a partition provided in an embodiment of the present application. Figure 7 As shown, the thicknesses of the plurality of flat plates 131 along the first direction may also be equal, and along the second direction, the projections of two adjacent flat plates 131 along the second direction partially overlap, that is, the two adjacent flat plates 131 are staggered.

[0074] In the battery pack 10 of the present application, after the battery cell 12 is accommodated in the accommodation groove 111, a side surface of the liquid cooling plate 11 along the first direction and the first side surface S1 of the battery cell 12 may form an uneven surface. Figure 6 and Figure 7 As shown, in one embodiment, along the first direction, the battery cell 12 has a thickness d1, the plate 131 has a thickness d2, the receiving groove 111 has a depth d3, and the sum of d1 and d2 is greater than or equal to d3. This ensures that the gaps between two adjacent liquid cooling plates 11 are equal.

[0075] Figure 8 Another schematic diagram of the liquid cooling plate provided in the embodiment of the present application. Figure 8 As shown, each liquid cooling plate 11 is provided with a cooling channel 114, and each liquid cooling plate 11 is provided with an inlet 115 and an outlet 116, and the inlet 115 and the outlet 116 are respectively connected to the cooling channel 114 of the liquid cooling plate 11. Along the second direction, the inlet 115 and the outlet 116 can be arranged on the same side of the liquid cooling plate 11, or can also be arranged on both sides of the liquid cooling plate 11. In one embodiment, along the second direction, one end of the liquid cooling plate 11 is provided with an inlet 115, and the other end is provided with an outlet 116. In another embodiment, along the second direction, one end of the liquid cooling plate 11 is provided with an inlet 115 and an outlet 116. In another embodiment, along the second direction, one end of the liquid cooling plate 11 is provided with two inlets 115, and the other end is provided with two outlets 116. In another embodiment, along the second direction, one end of the liquid cooling plate 11 is provided with an inlet 115 and an outlet 116, and the other end is provided with an inlet 115 and an outlet 116. In another embodiment, along the second direction, one end of the liquid cooling plate 11 is provided with an inlet 115, and the other end is provided with two outlets 116. In another embodiment, along the second direction, one end of the liquid cooling plate 11 is provided with two inlets 115, and the other end is provided with an outlet 116. That is, the number of inlets 115 and outlets 116 of the liquid cooling plate 11 is not limited, the inlet 115 may be one or more, and the outlet 116 may be one or more, which is not limited here, and the number of inlets 115 and the number of outlets 116 may be equal or unequal.

[0076] Fig. 9 Another schematic diagram of a liquid cooling plate provided in an embodiment of the present application, wherein: Fig. 9 for Figure 2 The top view of the liquid cooling plate along the third direction. Figure 2 and Fig. 9 As shown, the projection of the cooling channel 114 inside each liquid cooling plate 11 along the third direction can be arranged in an S shape, and the third direction is perpendicular to the plane where the first direction and the second direction are located (such as Figure 6In addition, the projection of each cooling channel 114 along the first direction may also be arranged in an S shape. Figure 7 As shown, in one embodiment, the liquid cooling plate 11 has a cooling channel 114 inside, and the cooling channel 114 is S-shaped along the first direction, thereby forming a plurality of parallel channels along the third direction.

[0077] The number of the cooling channel 114 is not limited to one. Fig.10 Another schematic diagram of the liquid cooling plate provided in the embodiment of the present application. Fig.10 As shown, in another embodiment, the liquid cooling plate 11 has a plurality of cooling channels 114 inside. These cooling channels 114 are arranged independently of each other and are arranged in parallel along the third direction. In this embodiment, the liquid cooling plate 11 is provided with a plurality of inlets 115 and a plurality of outlets 116. Along the second direction, the plurality of inlets 115 are located on one side of the liquid cooling plate 11, and the plurality of outlets 116 are located on the other side of the liquid cooling plate 11. Among them, the inlet 115 and the outlet 116 are respectively connected to the cooling channels 114 in a one-to-one correspondence. Therefore, each cooling channel 114 can be correspondingly provided with an inlet 115 and an outlet 116, so that the flow rate of the corresponding cooling channel 114 can be adjusted by controlling the inlet 115 and the outlet 116.

[0078] Fig.11 Another schematic diagram of the liquid cooling plate provided in the embodiment of the present application. Fig.11 As shown, when the liquid cooling plate 11 is provided with a plurality of cooling channels 114, the liquid cooling plate 11 may also be provided with only one inlet 115 and one outlet 116. The inlet 115 and the outlet 116 are located on both sides of the liquid cooling plate 11 along the second direction. Manifolds 117 are provided at both ends of the liquid cooling plate 11 along the second direction, and the manifolds 117 at both ends of the liquid cooling plate 11 are connected to the above-mentioned multiple cooling channels 114. The inlet 115 is connected to the manifold 117 on the same side, and the outlet 116 is connected to the manifold 117 on the same side. By connecting the above-mentioned multiple cooling channels 114 arranged at intervals in parallel through the manifold 117, uniform flow distribution of each cooling channel 114 can be achieved.

[0079] Fig.12 Another schematic diagram of the liquid cooling plate provided in the embodiment of the present application. Fig.12As shown, in another embodiment, when the liquid cooling plate 11 includes the above-mentioned main liquid cooling plate 112 and the above-mentioned multiple sub-liquid cooling plates 113, the main liquid cooling plate 112 may be provided with a first cooling channel 1141, and the sub-liquid cooling plate 113 may be provided with a second cooling channel 1142. An inlet 115 and an outlet 116 are provided at one end of the main liquid cooling plate 112 along the second direction, and the projection of the first cooling channel 1141 along the first direction is arranged in a U-shaped structure, and the two ends of the first cooling channel 1141 are respectively connected to the inlet 115 and the outlet 116. The projection of the second cooling channel 1142 along the second direction is arranged in a U-shaped structure. The inlet and outlet of the second cooling channel 1142 are located on the side of the sub-liquid cooling plate 113 close to the main liquid cooling plate 112, and are respectively connected to the first cooling channel 1141.

[0080] like Figures 1 to 3 As shown, electrodes are provided on the top surface of the battery cell 12. In each liquid cooling plate 11, along the second direction, the electrodes of any two adjacent battery cells 12 are connected by a connecting row 14, which can not only achieve structural fixation of the two adjacent battery cells 12, but also achieve electrical connection of the battery cells 12.

[0081] The liquid cooling plate 11 of the present application can improve the heat dissipation efficiency of the battery cell 12. In actual operation, the top surface of the battery cell 12 may also need to be assembled or electrically connected. For ease of operation, in one embodiment, along the third direction, the height of the liquid cooling plate 11 is greater than two-thirds of the height of the battery cell 12 and less than or equal to the height of the battery cell 12. It should be noted that in the embodiment of the present application, the height of the battery cell 12 refers to the distance between the bottom surface and the top surface of the battery cell 12 (excluding the height of the pole ear extending from the top).

[0082] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery pack, characterized in that: It includes a plurality of liquid cooling plates arranged in sequence along a first direction, each of the plurality of liquid cooling plates is formed with a plurality of receiving slots, the plurality of receiving slots are arranged in sequence along a second direction, each of the plurality of receiving slots receives a battery cell, and the first direction is perpendicular to the second direction; The battery core includes four side surfaces connected in sequence, two of the four side surfaces are arranged opposite to each other along the first direction, and the other two side surfaces are arranged opposite to each other along the second direction, the areas of the two side surfaces are larger than the areas of the other two side surfaces, and the two side surfaces and one of the other two side surfaces are respectively arranged toward the inner wall of the containing groove; A partition is further provided between any two adjacent liquid cooling plates among the plurality of liquid cooling plates, and the partition is used to separate the battery cells between the two adjacent liquid cooling plates.

2. The battery pack according to claim 1, characterized in that: The number of the accommodating grooves of the two adjacent liquid cooling plates is equal, and the projections of the accommodating grooves of the two adjacent liquid cooling plates along the first direction overlap.

3. The battery pack according to claim 2, characterized in that: The opening directions of the two overlapping containing grooves of the projections of the two adjacent liquid cooling plates along the first direction are the same.

4. The battery pack according to claim 2, characterized in that: The opening directions of the two accommodating grooves where the projections of the two adjacent liquid cooling plates overlap along the first direction are opposite; The partition is a heat insulation board, and the thermal conductivity of the heat insulation board is less than or equal to 0.

1.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The partition includes a plurality of flat plates, and the plurality of flat plates are sequentially arranged along the second direction.

6. The battery pack according to claim 5, characterized in that: Along the first direction, the sum of the thickness of the battery cell and the thickness of the plate is greater than or equal to the depth of the receiving groove.

7. The battery pack according to claim 5 or 6, characterized in that: The thicknesses of the plurality of flat plates along the first direction are equal; and along the second direction, projections of two adjacent flat plates among the plurality of flat plates partially overlap.

8. The battery pack according to any one of claims 1 to 7, characterized in that: Along a third direction, a height of each liquid cooling plate is greater than two-thirds of a height of the battery cell and less than or equal to a height of the battery cell, and the third direction is perpendicular to a plane where the first direction and the second direction are located.

9. The battery pack according to any one of claims 1 to 8, characterized in that: Each of the liquid cooling plates is arranged in a bent structure to form the multiple receiving grooves; in each of the liquid cooling plates, any two adjacent receiving grooves in the multiple receiving grooves have opening directions opposite to each other.

10. The battery pack according to claim 9, characterized in that: Each of the liquid cooling plates is provided with a cooling channel, and each of the liquid cooling plates is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the cooling channel; Along the second direction, the inlet and the outlet are respectively located on two sides of each liquid cooling plate, or the inlet and the outlet are located on the same side of each liquid cooling plate.

11. The battery pack according to claim 10, characterized in that: The projection of the cooling channel along a third direction is arranged in an S shape, and the third direction is perpendicular to the plane where the first direction and the second direction are located.

12. The battery pack according to claim 10 or 11, characterized in that: The projection of the cooling channel along the first direction is arranged in an S shape.

13. The battery pack according to claim 11, characterized in that: There are a plurality of cooling channels, and the plurality of cooling channels are arranged in parallel along the third direction; Each of the liquid cooling plates is provided with a plurality of inlets and a plurality of outlets. Along the second direction, the plurality of inlets are located on one side of each of the liquid cooling plates, and the plurality of outlets are located on the other side of each of the liquid cooling plates; the plurality of inlets are connected to the plurality of cooling channels in a one-to-one correspondence, and the plurality of outlets are connected to the plurality of cooling channels in a one-to-one correspondence.

14. The battery pack according to claim 11, characterized in that: There are a plurality of cooling channels, and the plurality of cooling channels are arranged in parallel along the third direction; Along the second direction, one end of each liquid cooling plate is provided with a collecting pipe and the inlet, and the other end of each liquid cooling plate is provided with another collecting pipe and the outlet; the one collecting pipe is connected to the inlet, and the one collecting pipe is connected to multiple cooling channels; the other collecting pipe is connected to the outlet, and the other collecting pipe is connected to multiple cooling channels.

15. The battery pack according to any one of claims 1 to 8, characterized in that: Each of the liquid cooling plates comprises a main liquid cooling plate and a plurality of sub-liquid cooling plates, the main liquid cooling plate extends along the second direction, the plurality of sub-liquid cooling plates extend along the first direction, and the plurality of sub-liquid cooling plates are spaced apart along the second direction; In each of the liquid cooling plates, two adjacent sub-liquid cooling plates and a portion of the main liquid cooling plate form the receiving groove, and the opening directions of the two adjacent receiving grooves are the same.

16. The battery pack according to claim 15, characterized in that: The main liquid cooling plate is provided with a first cooling channel, and each sub-liquid cooling plate is provided with a second cooling channel, the first cooling channel is connected to the second cooling channel, the inlet and outlet of the first cooling channel are located on the same side of the main liquid cooling plate, and the inlet and outlet of the second cooling channel are located on a side of the sub-liquid cooling plate close to the main liquid cooling plate.

17. An energy storage cabinet, characterized in that: It comprises a cabinet, a refrigeration unit and a plurality of battery packs as claimed in any one of claims 1 to 16, wherein the refrigeration unit and the plurality of battery packs are located in the cabinet, and a liquid cooling plate of each battery pack is connected to the refrigeration unit.

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