Battery cluster and energy storage device

Abstract

The utility model provides a kind of battery cluster and energy storage device, the utility model belongs to new energy field, comprising: fixing frame;Battery module, battery module has multiple, multiple battery module is sequentially arranged in fixed frame from bottom to top;Upper liquid cooling plate, install on fixed frame;The upper surface of the battery module located in the topmost is contacted with upper liquid cooling plate;Each battery module includes: lower liquid cooling plate, with fixed frame connection;Blade battery core, the lower surface of blade battery core and the upper surface of lower liquid cooling plate are mutually contacted;Between every adjacent two battery modules, the lower liquid cooling plate of battery module located in upper and the upper surface of battery module located in lower are mutually contacted.The purpose is to solve the poor heat dissipation capacity of battery module in prior art battery cluster.Problems.The technical effects achieved are: battery module has good heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a battery cluster and an energy storage device. Background Technology

[0002] In recent years, technological products have undergone rapid technological iterations in areas such as appearance design, control programs, and functional performance. However, in stark contrast, the development of energy storage battery technology has lagged behind, and its performance bottlenecks have become a key obstacle restricting the upgrading of large-scale energy storage devices and the new energy vehicle industry.

[0003] With a large influx of new energy capital into the energy storage industry, market competition is becoming increasingly fierce, and cost pressure has become a core challenge for companies. To cope with this pressure, major new energy companies are sparing no effort to pursue higher battery system energy density. The core strategy is to reduce the unit energy cost by increasing the capacity of individual cells and simplifying the structural components in battery modules and battery clusters. However, the current method of forming battery clusters involves integrating cells into battery modules, and then integrating battery modules into battery clusters. This requires reserving space between each battery module for installation, heat dissipation, or safety maintenance, resulting in wasted space.

[0004] Furthermore, existing liquid cooling solutions for battery modules in battery clusters mostly employ a single-sided liquid cooling plate design. While this provides some heat dissipation, it easily leads to significant temperature differences in the thickness direction of the battery cells, severely impairing their cycle life and performance consistency. Using a double-layer liquid cooling plate design to sandwich the battery cells can significantly improve temperature uniformity, but it would substantially increase material and manufacturing costs, causing the product to lose its cost competitiveness in the fierce market competition. Utility Model Content

[0005] This utility model provides a battery cluster to solve the defect of poor heat dissipation capacity of battery modules in existing battery clusters, and realizes a battery cluster structure with better heat dissipation effect of battery modules.

[0006] The first aspect of this utility model provides a battery cluster, comprising: Fixture; The battery module consists of multiple battery modules arranged sequentially from bottom to top within the mounting frame. The upper liquid cooling plate is mounted on the mounting bracket; The upper surface of the topmost battery module is in contact with the upper liquid cooling plate; Each battery module includes: The lower liquid cooling plate is connected to the mounting bracket. The blade battery cell has its lower surface in contact with the upper surface of the lower liquid cooling plate. Between each pair of adjacent battery modules, the lower liquid cooling plate of the upper battery module is in contact with the upper surface of the lower battery module.

[0007] In addition, the battery cluster according to this utility model may also have the following additional technical features: In some embodiments of this utility model, each battery module further includes: The lower housing is installed inside the mounting bracket, the lower liquid cooling plate is located at the bottom of the lower housing, and the blade battery cell is installed on the lower housing.

[0008] In some embodiments of this utility model, in each battery module, the lower housing includes: The bracket consists of two parallel brackets, each connected to a fixed frame, and each bracket has at least one leakage hole on its side wall. There are two end plates, which are parallel to each other. The combination of the two brackets and the two end plates forms a rectangle. The blade cell is placed in the space of the combination of the two brackets and the two end plates.

[0009] In some embodiments of this utility model, each bracket includes: The vertical plate is connected to the fixing frame on the side, and each end of the vertical plate is connected to an end plate. An inclined plate has its first side connected to a vertical plate, and the angle between the vertical plate and the inclined plate is an acute angle; the height of the second side of the inclined plate is greater than the height of the first side of the inclined plate. The straight plate is connected to the second side of the inclined plate. The two ends of the straight plate are connected to an end plate respectively. The first and second ends of the blade cell are respectively attached to the two straight plates.

[0010] In some embodiments of this utility model, in each battery module: The minimum distance between the vertical plate of each bracket and the blade cell is less than the minimum distance between the vertical plate and the straight plate.

[0011] In some embodiments of this utility model, each battery module further includes: Thermally conductive adhesive is applied to the surface of the blade cell facing away from the lower liquid cooling plate.

[0012] In some embodiments of this utility model, each battery module further includes: Thermally conductive structural adhesive is applied between the first end of the blade cell and one of the vertical plates, and between the second end of the blade cell and the other vertical plate.

[0013] In some embodiments of this utility model, the fixing frame includes: The base, with the lower housing of the battery module at the bottom mounted on it; Fixed beams: The lower housing of each battery module is connected to multiple fixed beams; The top beam and the base are connected by multiple fixed beams; The upper liquid cooling plate is connected to the top beam and / or multiple fixed beams.

[0014] In some embodiments of this utility model, the base includes: The frame, with the lower end of each fixed beam connected to the frame; Internal supports: Multiple internal supports are installed within the frame.

[0015] The second aspect of this utility model provides an energy storage device, which includes all the technical features of the battery cluster of the first aspect of this utility model.

[0016] In summary, this application includes the following beneficial technical effects: by arranging multiple battery modules sequentially from bottom to top within a fixed frame, and by ensuring that each battery module includes a lower liquid cooling plate and a blade cell, with the lower surface of the blade cell in contact with the upper surface of the lower liquid cooling plate, the following effects are achieved: First, the upper and lower surfaces of the blade cells in each battery module can be cooled by the liquid cooling plate, which gives the battery module of the battery cluster a better heat dissipation effect, thereby reducing the temperature difference between the upper and lower surfaces of the blade cells and improving the cycle life of the cells without increasing thermal management costs.

[0017] Secondly, multiple battery modules form a stacked structure, eliminating the space between layers and increasing the volumetric energy density of the battery cluster.

[0018] The liquid cooling plate design provides better protection for the top battery module and also allows for better heat dissipation of the battery cells on the top surface of the top battery module. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A perspective view of a battery cluster according to some embodiments of the present invention is shown schematically.

[0020] Figure 2 A perspective view schematically showing two battery modules of a battery cluster connected to a base according to some embodiments of the present invention is provided.

[0021] Figure 3A perspective view of a battery module of a battery cluster according to some embodiments of the present invention is shown schematically.

[0022] Figure 4 A perspective view of the lower housing of a battery cluster according to some embodiments of the present invention is shown schematically.

[0023] Figure 5 A schematic cross-sectional view of the lower housing of a battery cluster according to some embodiments of the present invention is shown.

[0024] Figure 6 An exploded perspective view of the lower housing of a battery cluster according to some embodiments of the present invention is shown schematically.

[0025] Figure 7 A partially enlarged perspective view of the lower housing of a battery cluster according to some embodiments of the present invention is shown schematically.

[0026] Figure 8 A schematic cross-sectional view is shown of a battery cluster according to some embodiments of the present invention, in which a blade cell is provided on the lower housing.

[0027] Figure 9 A partially enlarged cross-sectional view schematically shown is provided on the lower housing of a battery cluster according to some embodiments of the present invention, showing a blade cell.

[0028] Figure 10 A perspective view schematically showing the connection between the battery module and the base of a battery cluster according to some embodiments of the present invention is shown.

[0029] Figure 11 A perspective view of the base of a battery cluster according to some embodiments of the present invention is shown schematically.

[0030] Figure label: 1. Base; 11. Frame; 12. Internal support; 13. Weight reduction hole; 14. Second positioning pin; 15. Second welding bolt; 2. Battery module; 21. Lower housing; 211. Bracket; 2111. Vertical plate; 2112. Inclined plate; 2113. Straight plate; 212. End plate; 213. Lower liquid cooling plate; 214. Rivet; 215. First positioning pin; 216. First welding bolt; 217. Leakage hole; 218. Pipe connector; 22. Thermally conductive structural adhesive; 23. Battery management unit; 24. Adapter harness; 25. Thermally conductive adhesive; 26. Fuse; 27. Blade cell; 3. Upper liquid cooling plate; 4. Copper busbar; 5. Fixing beam; 6. Nut; 7. Water pipe; 8. Top beam; 9. Communication line. Detailed Implementation

[0031] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0032] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” used herein may also refer to the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a specific order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0033] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0034] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may also be rotated 90 degrees or in other orientations, and the spatial relative descriptors used in the text will be interpreted accordingly.

[0035] like Figures 1 to 11 As shown, according to an embodiment of the first aspect of the present invention, a battery cluster is proposed, including multiple battery modules 2, an upper liquid cooling plate 3 and a fixing frame. The upper liquid cooling plate 3 is mounted on the fixing frame. There are multiple battery modules 2, which are arranged in the fixing frame from bottom to top. Each battery module 2 includes a lower liquid cooling plate 213 and a blade cell 27, with the lower surface of the blade cell 27 in contact with the upper surface of the lower liquid cooling plate 213. Between each pair of adjacent battery modules 2, the lower liquid cooling plate 213 of the upper battery module 2 is in contact with the upper surface of the lower battery module 2. The upper surface of the battery module 2, located at the top, is in contact with the upper liquid cooling plate 3.

[0036] In the above embodiments, it should be noted that the lower liquid cooling plate 213 of each battery module 2 is connected to the fixing frame by welding, snap-fit ​​or screwing and is located inside the fixing frame. Each lower liquid cooling plate 213 is provided with a pipe joint 218. A water pipe 7 is provided on the side of the fixing frame. Each pipe joint 218 is connected to the water pipe 7 by screwing or snap-fit.

[0037] The beneficial effects of the above embodiments are as follows: by arranging multiple battery modules 2 sequentially from bottom to top within the fixing frame, and by ensuring that each battery module 2 includes a lower liquid cooling plate 213 and a blade cell 27, with the lower surface of the blade cell 27 in contact with the upper surface of the lower liquid cooling plate 213, the following effects are achieved: Third, the upper and lower surfaces of the blade cell 27 in each battery module 2 can be cooled and dissipated by the lower liquid cooling plate 213, thereby enabling the battery module of the battery cluster to have a better heat dissipation effect, thus reducing the temperature difference between the upper and lower surfaces of the blade cell 27, improving the cycle life of the cell without increasing the thermal management cost.

[0038] Fourth, multiple battery modules 2 form a stacked structure, eliminating the space between layers and increasing the volumetric energy density of the battery cluster.

[0039] The upper liquid cooling plate 3 provides better protection for the uppermost battery module 2 and also allows the upper surface of the battery cell of the uppermost battery module 2 to achieve better heat dissipation.

[0040] Optional, such as Figures 1 to 6 and Figure 10 As shown, each battery module 2 also includes a lower housing 21, a lower liquid cooling plate 213 is disposed at the bottom of the lower housing 21, and a blade cell 27 is mounted on the lower housing 21. Each lower housing 21 is mounted in a mounting bracket.

[0041] In the above embodiments, it should be noted that each battery module 2 also includes a battery management unit 23, a transfer harness 24, and a fuse 26. The battery management unit 23 adopts the existing battery management unit 23. The battery management unit 23 is electrically connected to the blade cell 27 through the transfer harness 24. The fuse 26 is electrically connected to the blade cell 27 and is located on the side of the lower housing 21.

[0042] The technical effect achieved by the above embodiment is that the liquid cooling plate and the blade cell 27 are reliably supported by the setting of the lower housing 21, which ensures the reliability and stability of the battery module 2 installed in the fixed frame.

[0043] Optional, such as Figures 4 to 9 As shown, in each battery module 2, the lower housing 21 includes two brackets 211 and two end plates 212. The two brackets 211 are parallel to each other, and the two end plates 212 are parallel to each other. The combined shape of the two brackets 211 and the two end plates 212 is rectangular. The blade cell 27 is disposed in the space of the combination of the two brackets 211 and the two end plates 212. Each bracket 211 has at least one leakage hole 217 on its side wall, and each bracket 211 is connected to the fixing frame.

[0044] In the above optional embodiments, it should be noted that each lower housing 21 further includes a first positioning pin 215, a first welding bolt 216, and a rivet 214. Each end plate 212 is connected to the fixing frame through the first positioning pin 215, and each bracket 211 is connected to the fixing frame through the first welding bolt 216. The bracket 211 and the end plate 212 are connected by welding or screwing. The lower cold plate and the end plate 212 are connected by rivets 214 or by screwing or welding. Each leakage hole 217 is opened at the lower edge of the side wall of the corresponding bracket 211.

[0045] The advantages of the above optional embodiments are: reliable drainage of the battery module 2 is achieved by setting the leakage hole 217. Optional, such as Figures 4 to 9 As shown, each bracket 211 includes a vertical plate 2111, an inclined plate 2112, and a straight plate 2113. The first side of the inclined plate 2112 is connected to the vertical plate 2111, and the second side of the inclined plate 2112 is connected to the straight plate 2113. The height of the second side of the inclined plate 2112 is greater than the height of the first side of the inclined plate 2112. The angle between the inclined plate 2112 and the straight plate 2113 is an obtuse angle, and the angle between the vertical plate 2111 and the inclined plate 2112 is an acute angle. Both the vertical plate 2111 and the straight plate 2113 are connected to two end plates 212. The first and second ends of the blade battery cell 27 are respectively attached to the two straight plates 2113. The vertical plate 2111 is connected to the fixing frame.

[0046] In the above optional embodiments, it should be noted that the vertical plate 2111, the inclined plate 2112 and the straight plate 2113 are bent into shape.

[0047] The two ends of the vertical plate 2111 are respectively connected to an end plate 212; the two ends of the straight plate 2113 are respectively connected to an end plate 212.

[0048] The beneficial effects of the above optional embodiments are as follows: by cooperating with the vertical plate 2111, the inclined plate 2112 and the straight plate 2113, the battery module 2 can discharge the condensate formed by the liquid cooling plate according to the inclined path of the set inclined plate 2112, thus ensuring the safety performance of the battery cluster.

[0049] Optional, such as Figures 4 to 9 As shown, in each battery module 2, the minimum distance between the vertical plate 2111 of each bracket 211 and the blade cell 27 is less than the minimum distance between the vertical plate 2111 and the straight plate 2113.

[0050] The beneficial effects of the above optional embodiments are as follows: by setting the minimum distance between the vertical plate 2111 and the blade cell 27 to be less than the minimum distance between the vertical plate 2111 and the straight plate 2113, the explosion-proof valve on the blade cell 27 and the two sides of the electrode post are prevented from contacting the condensation water on the lower liquid cooling plate 213, which further ensures the safety of the blade cell 27 and thus ensures the safety performance of the battery cluster.

[0051] Optional, such as Figures 1 to 6 and Figure 10 As shown, each battery module 2 also includes thermally conductive adhesive 25, and the surface of the blade cell 27 facing away from the lower liquid cooling plate 213 is provided with thermally conductive adhesive 25.

[0052] In the above optional embodiments, it should be noted that the thermally conductive adhesive 25 is bonded to the lower liquid cooling plate 213 of the upper battery module 2.

[0053] The advantages of the above optional embodiments are as follows: the thermally conductive adhesive 25 forms an efficient heat channel on the upper surface of the blade cell 27, which is closely attached to the lower liquid cooling plate 213 of the upper module, so that heat can be discharged in both directions and the heat dissipation effect is increased; after curing, the thermally conductive adhesive 25 bonds two adjacent battery modules 2 into a whole, effectively improving the mechanical impact resistance of this battery cluster.

[0054] By directly filling the gap between the blade cell 27 of the lower battery module 2 and the lower liquid cooling plate 213 of the upper battery module 2 with thermally conductive adhesive 25, the space is fully utilized while achieving integrated thermal management and structural support.

[0055] Optional, such as Figures 1 to 6 and Figure 10 As shown, each battery module 2 also includes thermally conductive structural adhesive 22. Thermally conductive structural adhesive 22 is provided between the first end of the blade cell 27 and one of the vertical plates 2111, and between the second end of the blade cell 27 and the other vertical plate 2111.

[0056] The beneficial effects of the above optional embodiments are as follows: the thermally conductive structural adhesive 22 forms an efficient heat channel between the two ends of the cell and the vertical plate 2111, which accelerates the transfer of heat to the side wall of the battery module 2 and reduces the risk of local overheating; the thermally conductive structural adhesive 22 elastically buffers the longitudinal expansion force of the blade cell 27 during charging and discharging, and reduces structural deformation.

[0057] Optional, such as Figure 1 and Figure 11 As shown, the mounting frame includes a base 1, a fixing beam 5 and a top beam 8. The base 1 and the top beam 8 are connected by multiple fixing beams 5. The lower housing 21 of each battery module 2 is connected to multiple fixing beams 5. The lower housing 21 of the bottommost battery module 2 is mounted on the base 1.

[0058] In the above optional embodiments, it should be noted that the base 1 also includes a second positioning pin 14 and a second welding bolt 15. The fixed beam 5 and the top beam 8 are both made of a connecting pipe with a hole. Each leakage hole 217 is evenly overlapped by a fixed beam 5 to achieve the function of drainage. The side of the base 1 is provided with a second welding bolt 15, and the upper surface of the base 1 is provided with a second positioning pin 14. The lower housing 21 at the lowest end is connected to the base 1 through the second positioning pin 14, and the base 1 is connected to the fixed beam 5 through the second welding bolt 15. The upper liquid cooling plate 3 is connected to the top beam 8 and / or multiple fixed beams 5.

[0059] It also includes copper busbars 4, nuts 6 and communication lines 9. Each battery module 2 has a copper busbar 4 on its side. The fuse 26 is electrically connected to the blade cell 27 through the copper busbar 4. The fixed beam 5 has nuts 6 on its side. The second welding bolts 15 are connected to the nuts 6 one by one. The battery management units 23 of multiple battery modules 2 are all connected to the communication lines 9.

[0060] The advantages of the above optional embodiments are as follows: the mounting frame structure forms a stable support through the base 1, the top beam 8, and the fixing beam 5. The lower housing 21 of the battery module 2 is connected to the fixing beam 5 and the base 1, ensuring a stable installation. The leakage hole 217 coincides with the fixing beam 5, allowing for drainage through the fixing beam 5 to promptly remove leaked liquid, preventing liquid accumulation that could damage the battery module 2, ensuring the safety performance of the battery module 2, and improving structural reliability and practicality.

[0061] Optional, such as Figure 1 , Figure 2 and Figure 11 As shown, the base 1 includes an inner support 12 and a frame 11. Multiple inner supports 12 are provided inside the frame 11, and the lower ends of multiple fixed beams 5 are connected to the frame 11.

[0062] In the above optional embodiments, it should be noted that the frame 11 is provided with multiple weight-reducing holes 13; multiple internal supports 12 are arranged in a cross shape inside the frame 11.

[0063] The advantages of the above optional embodiments are: the cooperation between the inner support 12 and the frame 11 ensures the stability and firmness of the base 1, thereby ensuring the stability of the fixing frame. According to an embodiment of the second aspect of the present invention, an energy storage device is proposed, which includes all the technical features of the battery cluster of the first aspect of the present invention.

[0064] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery cluster, characterized in that, include: Fixture; A battery module, wherein there are multiple battery modules, and the multiple battery modules are arranged sequentially from bottom to top in the fixing frame; The upper liquid cooling plate is mounted on the fixed frame; The upper surface of the battery module located at the top is in contact with the upper liquid cooling plate (3); Each of the battery modules includes: The lower liquid cooling plate is connected to the fixed frame; The blade battery cell has its lower surface in contact with the upper surface of the lower liquid cooling plate. Between each pair of adjacent battery modules, the lower liquid cooling plate of the upper battery module is in contact with the upper surface of the lower battery module.

2. The battery cluster according to claim 1, characterized in that, Each of the battery modules also includes: The lower housing is installed inside the fixing frame, the lower liquid cooling plate is disposed at the bottom of the lower housing, and the blade battery cell is installed on the lower housing.

3. The battery cluster according to claim 2, characterized in that, In each of the battery modules, the lower housing includes: The bracket has two supports, which are parallel to each other. Each support is connected to the fixed frame, and each support has at least one leakage hole on its side wall. The end plates are two in number and are parallel to each other. The combination of the two supports and the two end plates is rectangular. The blade battery cell is disposed in the space of the combination of the two supports and the two end plates.

4. The battery cluster according to claim 3, characterized in that, Each of the aforementioned stents includes: A vertical plate is connected to the fixing frame on its side, and each end of the vertical plate is connected to one of the end plates. An inclined plate, with its first side connected to the vertical plate, the angle between the vertical plate and the inclined plate being an acute angle; the height of the second side of the inclined plate is greater than the height of the first side of the inclined plate (2112); A straight plate is connected to the second side of the inclined plate, and both ends of the straight plate are respectively connected to an end plate. The first end and the second end of the blade cell are respectively attached to the two straight plates.

5. The battery cluster according to claim 4, characterized in that, In each of the battery modules: The minimum distance between the vertical plate of each bracket and the blade cell is less than the minimum distance between the vertical plate and the straight plate.

6. The battery cluster according to any one of claims 1-5, characterized in that, Each of the battery modules also includes: Thermally conductive adhesive is applied to the surface of the blade cell facing away from the lower liquid cooling plate.

7. The battery cluster according to claim 4, characterized in that, Each of the battery modules also includes: Thermally conductive structural adhesive is provided between the first end of the blade cell and one of the vertical plates, and between the second end of the blade cell and the other vertical plate.

8. The battery cluster according to claim 2, characterized in that, The fixing frame includes: The base, on which the lower housing of the battery module located at the bottom is mounted; Fixed beams, with each battery module's lower housing connected to multiple fixed beams; The top beam is connected to the base by multiple fixed beams; The upper liquid cooling plate is connected to the top beam and / or the plurality of fixed beams.

9. The battery cluster according to claim 8, characterized in that, The base includes: The frame, wherein the lower end of each of the fixed beams is connected to the frame; The frame is provided with multiple internal supports.

10. An energy storage device, characterized in that, Includes the battery cluster as described in any one of claims 1 to 9.

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