Energy storage device

Abstract

The embodiment of the utility model provides an energy storage device, and relates to the technical field of energy storage. The energy storage device comprises a first liquid cooling plate, a second liquid cooling plate and a battery module. And the first plate surface of the first liquid cooling plate is opposite to the second plate surface of the second liquid cooling plate. The first liquid cooling plate, the battery module and the second liquid cooling plate are sequentially stacked, and heat-conducting media are arranged between the bottom surface of the battery module and the first plate surface and between the top surface of the battery module and the second plate surface. A first channel for cooling liquid to flow is arranged in the first liquid cooling plate, and a second channel for cooling liquid to flow is arranged in the second liquid cooling plate, so that the battery module is cooled through the cooling liquid. The energy storage device is compact in structure and high in space utilization rate and volume energy density, the battery module can fully dissipate heat, and the heat dissipation effect is better.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage technology, and specifically to an energy storage device. Background Art

[0002] With the continuous development of new energy technologies, energy storage devices are increasingly being used in power systems, mobile devices, and renewable energy systems. Energy storage devices typically have a large number of built-in battery modules to store sufficient electrical energy.

[0003] In existing energy storage devices, multiple layers of storage spaces are usually formed through frame structures such as support beams, and multiple battery modules are placed in different storage spaces. At the same time, a liquid cooling plate is provided at the bottom of each battery module to cool and dissipate heat.

[0004] However, existing energy storage devices often have large housing dimensions, resulting in low space utilization and volumetric energy density. Only the bottom surface of the battery module can directly exchange heat with the liquid cooling plate, resulting in poor heat dissipation. Furthermore, the temperature difference between the top and bottom of the battery module is large, impacting its performance and lifespan. Therefore, achieving both compactness and heat dissipation efficiency in energy storage devices remains a pressing technical challenge. Utility Model Content

[0005] In view of the above problems, an embodiment of the present application provides an energy storage device, which stacks a first liquid cooling plate, a battery module, and a second liquid cooling plate in sequence, and a heat conducting medium is arranged between the bottom surface of the battery module and the first plate surface of the first liquid cooling plate, and between the top surface of the battery module and the second plate surface of the second liquid cooling plate. When the first liquid cooling plate, the battery module, and the second liquid cooling plate are in close contact with each other, the bottom and top surfaces of the battery module can be fully heat exchanged through the heat conducting medium, which can make the energy storage device more compact and improve its space utilization and volume energy density, and can also make the heat dissipation area of ​​the battery module larger, so that the battery module can obtain sufficient heat dissipation and improve its heat dissipation effect.

[0006] One aspect of an embodiment of the present application provides an energy storage device, which includes a first liquid cooling plate, a second liquid cooling plate, and a battery module. The first plate surface of the first liquid cooling plate and the second plate surface of the second liquid cooling plate are opposite to each other. The first liquid cooling plate, the battery module, and the second liquid cooling plate are stacked in sequence, and a heat conducting medium is provided between the bottom surface of the battery module and the first plate surface, and between the top surface of the battery module and the second plate surface. A first channel for the flow of cooling liquid is provided in the first liquid cooling plate, and a second channel for the flow of cooling liquid is provided in the second liquid cooling plate.

[0007] In this energy storage device, the battery module completely occupies the space between the first and second liquid cooling plates, making the overall structure more compact and improving space utilization and volumetric energy density. Furthermore, both the bottom and top surfaces of the battery module can exchange heat with the two different liquid cooling plates through a thermally conductive medium, resulting in a larger heat dissipation area, more efficient cooling and better heat dissipation.

[0008] In an optional manner, the battery module includes a plurality of battery cells, each battery cell is arranged in a layer, and the arrangement direction of each battery cell is perpendicular to the relative direction of the bottom surface and the top surface of the battery module.

[0009] In this method, the battery cells are arranged in a layer, so that multiple battery cells are laid flat between the first liquid cooling plate and the second liquid cooling plate, so that the first liquid cooling plate and the second liquid cooling plate can simultaneously dissipate heat for each battery cell at both ends of each battery cell, and each battery cell dissipates heat more fully and has a better heat dissipation effect.

[0010] In an optional manner, the battery module includes a plurality of battery cells, each of which is arranged in two layers, and the arrangement direction of the plurality of battery cells in each layer is perpendicular to the relative direction of the bottom surface and the top surface of the battery module.

[0011] In this method, the battery cells are arranged in two layers, one above the other, so that the first and second liquid cooling plates can simultaneously dissipate heat from the two stacked layers of battery cells from the upper and lower ends. This not only enables each battery cell to fully exchange heat with the liquid cooling plate, but also reduces the number of liquid cooling plates.

[0012] In an optional manner, a heat-conducting medium is provided between every two adjacent battery cells.

[0013] In this way, heat can be transferred between different battery cells, thereby averaging the heat, avoiding heat accumulation in local locations of the battery module, improving the temperature uniformity of the battery module, and further improving the heat dissipation effect.

[0014] In an optional manner, the battery module includes a binding strap, which surrounds each battery cell.

[0015] This method has a simple structure, is easy to assemble, and has a compact overall structure, occupies little space, and has low cost.

[0016] In an optional manner, the maximum outer surfaces of the multiple battery cells in each layer are coplanar, so as to be spliced ​​to form the bottom surface or top surface of the battery module.

[0017] In this manner, the largest outer surface of each battery cell can directly exchange heat with the first liquid cooling plate or the second liquid cooling plate through a heat-conducting medium, resulting in a large heat exchange area and better heat dissipation effect.

[0018] In an optional manner, the heat-conducting medium is a heat-conducting pad, a heat-conducting gel, or a heat-conducting structural adhesive.

[0019] In this approach, thermal pads are used as the thermal conductive medium, making assembly and disassembly easy and ensuring sufficient heat exchange. Thermally conductive structural adhesives offer excellent thermal conductivity and are easy to apply. Thermal gels facilitate battery module disassembly, allowing individual cells to be disassembled for repair or replacement if a battery fails, making maintenance more convenient, efficient, and cost-effective.

[0020] In an optional manner, channel paths of the first channel and the second channel projected in relative directions of the first liquid cooling plate and the second liquid cooling plate overlap.

[0021] In this manner, the first channel and the second channel have the same channel trajectories, which can make the heat exchange positions and heat exchange rates of the top and bottom surfaces of the battery module tend to be consistent when the coolant flows in the first channel and the second channel, thereby allowing the top and bottom of the battery module to dissipate heat synchronously, making the temperature difference between different parts of the battery module smaller, and further improving the temperature uniformity of the battery module.

[0022] In one optional embodiment, the first liquid cooling plate is provided with a first inlet and a first outlet of the first channel, and the second liquid cooling plate is provided with a second inlet and a second outlet of the second channel. The relative orientation of the first inlet and the first outlet is opposite to the relative orientation of the second inlet and the second outlet, so that the flow direction of the coolant in the first channel is opposite to the flow direction of the coolant in the second channel.

[0023] In this manner, the parts of the battery module located at the first and second ends of the first channel will maintain similar temperatures, thereby making the temperature distribution of the battery module more uniform, reducing the temperature difference between different parts of the battery module, and improving the temperature uniformity of the battery module.

[0024] In an optional manner, the first inlet, the first outlet, the second inlet, and the second outlet are all located on the same side of the first liquid cooling plate and the second liquid cooling plate.

[0025] This method facilitates the arrangement and installation of liquid cooling pipes for conveying coolant, and also makes the overall structure more regular, further saving occupied space and improving the compactness of the battery module.

[0026] In the energy storage device provided in the embodiment of the present application, the first liquid cooling plate, the battery module and the second liquid cooling plate are stacked in sequence, so that the battery module is supported on the first plate surface of the first liquid cooling plate, and the second liquid cooling plate is also against the top surface of the battery module. The space between the first liquid cooling plate and the second liquid cooling plate is fully utilized, the overall structure is more compact, and the space utilization rate and volume energy density are higher. In addition, a heat-conducting medium is provided between the bottom surface of the battery module and the first plate surface, and between the top surface of the battery module and the second plate surface, so that the bottom surface and the top surface of the battery module can exchange heat with two different liquid cooling plates through the heat-conducting medium, and the heat dissipation area is larger and the heat dissipation effect is better. In addition, the bottom surface and the top surface of the battery module exchange heat at the same time, the temperature difference between different parts of the battery module is small, the temperature distribution of the battery module is more uniform, and the temperature uniformity is better, thereby avoiding the influence of temperature difference on the performance and life of the battery module.

[0027] The above description is only an overview of the technical solutions of the embodiments of this application. In order to more clearly understand the technical means of the embodiments of this application, you can implement them according to the contents of the description. In order to make the above and other purposes, features and advantages of the embodiments of this application more obvious and easy to understand, the following specifically describes the specific implementation methods of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A schematic diagram of the overall structure of an energy storage device provided in an embodiment of the present application.

[0030] Figure 2 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of the present application in which multiple liquid cooling plates and multiple battery modules are alternately stacked.

[0031] Figure 3 A schematic diagram of the partial structure of an energy storage device provided in an embodiment of the present application.

[0032] Figure 4 This is a schematic structural diagram of an energy storage device provided in an embodiment of the present application when multiple battery cells are arranged in a layer.

[0033] Figure 5 This is a schematic structural diagram of an energy storage device provided in an embodiment of the present application when multiple battery cells are arranged in two layers.

[0034] Reference numerals:

[0035] 10. Liquid cooling plate; 11. First liquid cooling plate; 111. First inlet; 112. First outlet; 12. Second liquid cooling plate; 121. Second inlet; 122. Second outlet;

[0036] 20. Battery module; 21. Battery cell; 22. Strap;

[0037] 30. Thermal conductive medium. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0040] The terms "comprises", "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0041] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0043] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the energy storage device of the present application. For example, in the description of the present application, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the directions or positional relationships shown in the drawings, and are 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 operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0044] In addition, the expressions of the indicated directions, such as the X direction, the Y direction, and the Z direction, used to illustrate the operation and construction of the various components of the energy storage device of this embodiment are not absolute but relative, and although these indications are appropriate when the various components of the energy storage device are in the positions shown in the figures, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

[0045] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0046] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a fixing member, such as a screw, bolt, or other fixing member. A physical connection can also be a detachable connection, such as a mutual snap-fit ​​connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. In addition to referring to a physical connection, "connected" or "connected" in a circuit structure can also refer to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is interconnected. It can also refer to internal communication between two elements. A signal connection can refer to a signal connection through a circuit or a signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0048] The energy storage device provided in this application can be an energy storage cabinet, an energy storage container, a battery cluster, etc. The energy storage device has at least one battery module, and the battery module includes multiple battery cells. The energy storage device provided in this embodiment is specifically as follows Figure 1 、 Figure 2 As shown, Figure 1 This is a schematic diagram of the overall structure of an energy storage device provided in an embodiment of the present application. Figure 2 The schematic diagram of the structure of an energy storage device provided in an embodiment of the present application, wherein multiple liquid cooling plates and multiple battery modules are alternately stacked. The energy storage device includes multiple liquid cooling plates 10 and multiple battery modules 20.

[0049] The battery module 20 is a component between two adjacent liquid cooling plates 10 that stores and releases electrical energy. It includes multiple battery cells 21, which can be connected in series or in parallel via conductive elements. The liquid cooling plates 11 are heat dissipation structures located at the bottom and top of the battery module 20, dissipating heat from the module.

[0050] The first and second cold plates 11, 12 are generic names for any two adjacent cold plates 10, which surround the battery module 20 from top to bottom. The first cold plate 11 refers to the cold plate 10 located at the bottom of the battery module 20, and the second cold plate 12 refers to the cold plate 10 located at the top of the battery module 20. In other feasible embodiments, other cold plates 10 identical to the first and second cold plates 11, 12 may also be referred to as the third cold plate, the fourth cold plate, or the like.

[0051] The first liquid cooling plate 11 and the second liquid cooling plate 12 are arranged opposite to each other and spaced a certain distance apart. Figure 3 As shown, Figure 3 A schematic diagram of a partial structure of an energy storage device provided in an embodiment of the present application. The first surface of the first liquid cooling plate 11 and the second surface of the second liquid cooling plate 12 face each other, leaving space between the first and second surfaces for accommodating the battery module 20. The battery module 20 is positioned between the first and second liquid cooling plates 11, 12.

[0052] like Figure 3 As shown, the placement relationship of the first liquid cooling plate 11, the battery module 20, and the second liquid cooling plate 12 is that the first liquid cooling plate 11, the battery module 20, and the second liquid cooling plate 12 are stacked in sequence. Specifically, the bottom surface of the battery module 20 is placed on the first plate surface of the first liquid cooling plate 11, and the second plate surface of the second liquid cooling plate 12 is placed on the top surface of the battery module 20, so that the first liquid cooling plate 11, the battery module 20, and the second liquid cooling plate 12 are stacked in sequence from bottom to top. Among them, the bottom surface and the top surface of the battery module 20 are the two opposite sides of the battery module, which are used to abut against the first liquid cooling plate 11 and the second liquid cooling plate 12 respectively.

[0053] The battery module 20 is carried on the first plate surface of the first liquid cooling plate 11, and the second liquid cooling plate 12 is placed on the bottom surface of the battery module 20, so that the battery module 20 just occupies all the space between the first liquid cooling plate 11 and the second liquid cooling plate 12. The first liquid cooling plate 11, the battery module 20 and the second liquid cooling plate 12 form a compact overall structure, thereby improving space utilization and volume energy density.

[0054] Both the first liquid cooling plate 11 and the second liquid cooling plate 12 may be made of metal or plastic materials with high thermal conductivity, corrosion resistance and certain structural strength, so that the first liquid cooling plate 11 has sufficient strength to support the battery module 20 while ensuring heat exchange performance.

[0055] The areas of the first and second plate surfaces can be larger. For example, the area of ​​the first plate surface can be larger than the area of ​​the bottom surface of the battery module 20, and the area of ​​the second plate surface can be larger than the area of ​​the top surface of the battery module 20. This fully covers the bottom and top surfaces of the battery module 20, ensuring that the battery module 20 has sufficient heat exchange area for sufficient heat exchange. Furthermore, the areas of the first and second plate surfaces can be the same or different, and this is not a limitation here.

[0056] The first liquid cooling plate 11 is provided with a first channel for the flow of coolant, and the second liquid cooling plate 12 is provided with a second channel for the flow of coolant, thereby dissipating heat from the battery module 20 through the circulation of the coolant. It should be understood that the first and second liquid cooling plates 11 and 12 are merely part of the liquid cooling assembly. The liquid cooling assembly may also include liquid cooling pipes connected to the first and second channels, a liquid cooling unit, etc., which are not limited here.

[0057] There are many specific structural forms of the first channel and the second channel. For example, the channel trajectories of the first channel and the second channel can be straight, winding S-shaped, etc. The cross-section shapes of the first channel and the second channel can be circular, square, or triangular, etc., without limitation.

[0058] The channel trajectories, intercepting surface shapes, and intercepting areas of the first and second channels can be identical or different. For example, in one feasible approach, the channel trajectories of the first and second channels can be identical. Specifically, the channel paths of the first and second channels projected in the relative directions of the first and second liquid cooling plates 11, 12 overlap.

[0059] In this manner, the first channel and the second channel have the same channel trajectories, so that when the coolant flows in the first channel and the second channel, the heat exchange states such as the heat exchange position and heat exchange rate of the top and bottom surfaces of the battery module 20 tend to be consistent, thereby allowing the top and bottom of the battery module 20 to dissipate heat synchronously, making the temperature difference between different parts of the battery module 20 smaller, and further improving the temperature uniformity of the battery module 20.

[0060] The flow direction of the cooling liquid in the first channel and the flow direction of the cooling liquid in the second channel can be the same or different. Figure 3 As shown, the first liquid cooling plate 11 is provided with a first inlet 111 and a first outlet 112 of the first channel, and the second liquid cooling plate 12 is provided with a second inlet 121 and a second outlet 122 of the second channel. The relative orientation of the first inlet 111 and the first outlet 112 is opposite to the relative orientation of the second inlet 121 and the second outlet 122, so that the flow direction of the coolant in the first channel is opposite to the flow direction of the coolant in the second channel.

[0061] In this approach, the first and second channels are positioned at opposite ends, so that the coolant flows in the first channel in opposite directions to the coolant flowing in the second channel. Even if the cooling capacity of the coolant decreases as it flows, the areas of the battery module 20 located at the first and second ends of the first and second channels will maintain similar temperatures. This results in a more uniform temperature distribution across the battery module 20, minimizing temperature differences between different areas of the battery module 20 and improving temperature uniformity across the battery module 20.

[0062] In addition, the first inlet 111 and the first outlet 112 can be located on the same side of the first liquid cooling plate 11, or on different sides of the first liquid cooling plate 11. Similarly, the second inlet 121 and the second outlet 122 can be located on the same side of the second liquid cooling plate 12, or on different sides of the second liquid cooling plate 12.

[0063] And, in an alternative way one can Figure 3 As shown, the first inlet 111, the first outlet 112, the second inlet 121 and the second outlet 122 are all located on the same side of the first liquid cooling plate 11 and the second liquid cooling plate 12, which facilitates the arrangement and installation of the liquid cooling pipe for conveying the coolant, and also makes the overall structure more regular, further saves the occupied space, and improves the compactness of the battery module 20.

[0064] like Figure 3 As shown, a heat conducting medium 30 is disposed between the bottom surface of the battery module 20 and the first plate surface, and between the top surface of the battery module 20 and the second plate surface. Specifically, a heat conducting medium 30 having a heat conducting effect is disposed between the bottom surface of the battery module 20 and the first plate surface, and a heat conducting medium 30 having a heat conducting effect is also disposed between the top surface of the battery module 20 and the second plate surface.

[0065] When the battery module 20 is charging or discharging, the bottom and top surfaces of the battery module 20 transfer heat to the first liquid cooling plate 11 and the second liquid cooling plate 12 through the heat-conducting medium 30, and the heat is carried away by the flow of the coolant. Because the heat-conducting medium 30 has good thermal conductivity and can fully fill the space between the battery module 20 and the liquid cooling plate 10, the battery module 20 can dissipate heat more evenly and fully, thereby improving the heat dissipation effect. In addition, because the bottom and top surfaces of the battery module 20 dissipate heat simultaneously, its heat dissipation area is large, which can further improve the heat dissipation effect and reduce the temperature difference between different parts of the battery module 20, thereby ensuring good temperature uniformity and avoiding the impact of temperature differences on the performance and life of the battery module 20.

[0066] There are many ways to set the thermal conductive medium 30. In specific embodiments, the thermal conductive medium 30 can be a thermal pad, thermal conductive gel, or thermal conductive structural adhesive. When the thermal conductive medium 30 is a thermal pad, it can specifically be a silicone pad. When installing the thermal pad, simply place it between the battery module 20 and the liquid cooling plate 10. When the thermal conductive medium 30 is a thermal pad, the thermal pad has a uniform thickness, is easy to assemble and disassemble, and can achieve sufficient heat exchange.

[0067] When the heat-conducting medium 30 is a heat-conducting gel or a heat-conducting structural adhesive, it is only necessary to apply the heat-conducting gel or the heat-conducting structural adhesive between the battery module 20 and the liquid cooling plate 10. A specific implementation method can be to first apply the heat-conducting gel or the heat-conducting structural adhesive on the first plate surface of the first liquid cooling plate 11, and then place the bottom surface of the battery module 20 in alignment with the first plate surface, and then apply the heat-conducting gel or the heat-conducting structural adhesive on the top surface of the battery module 20, and then place the second plate surface of the second liquid cooling plate 12 in alignment with the top surface of the battery module 20.

[0068] When the thermal conductive medium 30 is a thermally conductive gel or a thermally conductive structural adhesive, it has excellent thermal conductivity and is easy to apply. Furthermore, the adhesive strength of the thermally conductive gel is lower than that of the thermally conductive structural adhesive, making the battery module 20 easy to disassemble. If a battery fails, the individual battery can be disassembled for repair or replacement, making maintenance more convenient, efficient, and cost-effective.

[0069] In addition, in this embodiment, the structural form of the battery module 20 can be further configured to enhance the heat dissipation effect of the battery module 20 .

[0070] An alternative method is Figure 3 and Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of the present application, wherein multiple battery cells are arranged in a layer. The battery module 20 includes multiple battery cells 21, each arranged in a layer, and the arrangement direction of each battery cell 21 is perpendicular to the relative direction of the bottom and top surfaces of the battery module 20.

[0071] In this manner, the battery cells 21 are arranged in a layer, so that the plurality of battery cells 21 are laid flat between the first liquid cooling plate 11 and the second liquid cooling plate 12, so that the first liquid cooling plate 11 and the second liquid cooling plate 12 can simultaneously dissipate heat for each battery cell 21 at both ends of each battery cell 21, and each battery cell 21 dissipates heat more fully, resulting in a better heat dissipation effect.

[0072] Another alternative is Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of the present application, wherein multiple battery cells are arranged in two layers. The battery module 20 includes multiple battery cells 21, each arranged in two layers, with the arrangement direction of the multiple battery cells 21 in each layer perpendicular to the relative direction of the bottom and top surfaces of the battery module 20.

[0073] In this manner, the battery cells 21 are arranged into two layers, one above the other, so that the first liquid cooling plate 11 and the second liquid cooling plate 12 can simultaneously dissipate heat from the upper and lower ends of the two stacked layers of battery cells 21. This not only enables each battery cell 21 to fully exchange heat with the liquid cooling plate 10, but also reduces the number of liquid cooling plates 10.

[0074] In the battery module 20, the battery cells 21 can be arranged closely together to save space. Figure 5 As shown, a heat conducting medium 30 is provided between each two adjacent battery cells 21 to enable heat to be transferred between different battery cells 21, thereby averaging the heat, avoiding heat accumulation in a local position of the battery module 20, improving the temperature uniformity of the battery module 20, and further improving the heat dissipation effect.

[0075] The multiple battery cells 21 should be connected as a whole to facilitate the placement and fixation of the battery module 20. An optional method is as follows Figure 3 As shown, the battery module 20 includes a strap 22, which surrounds and binds each battery cell 21. This method has a simple structure, is easy to assemble, and has a compact overall structure, occupies little space, and is low in cost.

[0076] Of course, in addition to using the straps 22 to secure the battery cells 21 together, other methods, such as bonding or snap-fitting, can also be used to connect the battery cells 21, without limitation. Furthermore, the battery module 20 composed of multiple battery cells 21 can be secured to the liquid cooling plate 10 using fasteners such as bolts.

[0077] In addition, no matter how many layers the battery cells 21 are arranged in, in order to improve the cooling effect on the battery cells 21, the largest outer surface of the battery cells 21 can be made to face the liquid cooling plate 10. For example, an optional method is as follows Figure 4 and Figure 5 As shown, the maximum outer surfaces of the plurality of battery cells 21 in each layer are made coplanar so as to be spliced ​​to form the bottom surface or the top surface of the battery module 20 .

[0078] In this manner, the largest outer surface of each battery cell 21 can directly exchange heat with the first liquid cooling plate 11 or the second liquid cooling plate 12 through the heat conducting medium 30 , resulting in a large heat exchange area and better heat dissipation effect.

[0079] In this embodiment, when multiple liquid cooling plates 10 and multiple battery modules 20 are provided in the energy storage device, the first and second liquid cooling plates 11 and 12 can be used in a local area of ​​the energy storage device to cover the bottom and top surfaces of the battery modules 20, that is, the liquid cooling plates 10 and battery modules 20 in a certain part are alternately stacked.

[0080] When multiple liquid cooling plates 10 and multiple battery modules 20 are provided in the energy storage device, all the liquid cooling plates 10 and battery modules of the energy storage device can also adopt the above-mentioned alternating stacking structure. Figure 2As shown, each liquid cooling plate 10 can be alternately stacked with each battery module 20, so that the bottom and top surfaces of each battery module 20 are in contact with two opposing liquid cooling plates 10. This allows each battery module 20 to completely occupy the space between the liquid cooling plates 10, thereby improving the space utilization and volumetric energy density of the energy storage device, and allowing the arrangement of more battery modules 20 within a limited volume. Furthermore, when multiple liquid cooling plates 10 and multiple battery modules 20 are provided, the structure of each liquid cooling plate 10 can be either identical or different. Similarly, the specific structure of each battery module 20 can be either identical or different, and this is not limited here.

[0081] In summary, in the energy storage device described above, the first liquid cooling plate, the battery module, and the second liquid cooling plate are stacked in sequence, so that the battery module is supported on the first plate surface of the first liquid cooling plate, and the second liquid cooling plate is also against the top surface of the battery module. The space between the first liquid cooling plate and the second liquid cooling plate is fully utilized, the overall structure is more compact, and the space utilization rate and volume energy density are higher. In addition, a heat-conducting medium is provided between the bottom surface of the battery module and the first plate surface, and between the top surface of the battery module and the second plate surface, so that the bottom surface and the top surface of the battery module can exchange heat with two different liquid cooling plates through the heat-conducting medium, and the heat dissipation area is larger and the heat dissipation effect is better. In addition, the bottom surface and the top surface of the battery module exchange heat at the same time, the temperature difference between different parts of the battery module is small, the temperature distribution of the battery module is more uniform, and the temperature uniformity is better, thereby avoiding the influence of temperature difference on the performance and life of the battery module.

[0082] Those skilled in the art will appreciate that, although some embodiments herein do not include certain features included in other embodiments, combinations of features from different embodiments are still within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0083] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage device, characterized in that: The energy storage device includes a first liquid cooling plate, a second liquid cooling plate and a battery module; The first plate surface of the first liquid cooling plate and the second plate surface of the second liquid cooling plate are opposite to each other; the first liquid cooling plate, the battery module and the second liquid cooling plate are stacked in sequence, and a heat conducting medium is provided between the bottom surface of the battery module and the first plate surface, and between the top surface of the battery module and the second plate surface; A first channel for cooling liquid to flow is provided in the first liquid cooling plate, and a second channel for cooling liquid to flow is provided in the second liquid cooling plate.

2. The energy storage device according to claim 1, characterized in that The battery module includes a plurality of battery cells, each of which is arranged in a layer, and an arrangement direction of each of the battery cells is perpendicular to a relative direction between a bottom surface and a top surface of the battery module.

3. The energy storage device according to claim 1, characterized in that The battery module includes a plurality of battery cells, each of which is arranged in two layers. The arrangement direction of the plurality of battery cells in each layer is perpendicular to the relative direction of the bottom surface and the top surface of the battery module.

4. The energy storage device according to claim 2 or 3, characterized in that: The heat conducting medium is arranged between every two adjacent battery cells.

5. The energy storage device according to claim 2 or 3, characterized in that: The battery module includes a binding band, and the binding band surrounds each of the battery cells.

6. The energy storage device according to claim 2 or 3, characterized in that: The maximum outer surfaces of the plurality of battery cells in each layer are coplanar so as to be spliced ​​to form the bottom surface or the top surface of the battery module.

7. The energy storage device according to claim 1, characterized in that The heat-conducting medium is a heat-conducting pad, a heat-conducting gel or a heat-conducting structural adhesive.

8. The energy storage device according to claim 1, characterized in that Channel paths of the first channel and the second channel projected in the relative directions of the first liquid cooling plate and the second liquid cooling plate overlap.

9. The energy storage device according to claim 8, characterized in that The first liquid cooling plate is provided with a first inlet and a first outlet of a first channel, and the second liquid cooling plate is provided with a second inlet and a second outlet of a second channel; The relative position of the first inlet and the first outlet is opposite to the relative position of the second inlet and the second outlet, so that the flow direction of the coolant in the first channel is opposite to the flow direction of the coolant in the second channel.

10. The energy storage device according to claim 9, characterized in that: The first inlet, the first outlet, the second inlet, and the second outlet are all located on the same side of the first liquid cooling plate and the second liquid cooling plate.

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