Battery cluster and energy storage system

Abstract

The utility model provides a battery cluster and an energy storage system. The battery cluster comprises a plurality of battery modules stacked in the height direction, each battery module comprises a battery unit (1), two module end plates (2) arranged on the two opposite sides of the battery unit (1) and a tab located on one side of the battery unit (1), in the height direction, the module end plates (2) of every two adjacent battery modules abut against each other, and the tab is located on the other side of the battery unit (1). And a preset interval capable of accommodating a tab is formed between every two adjacent battery units (1). According to the battery cluster disclosed by the utility model, the volume of a battery module can be reduced, the space utilization rate of the battery cluster is improved, and the battery energy density is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to an energy storage battery cluster and an energy storage system. Background Art

[0002] As battery costs decrease, batteries have been widely used as carriers of energy storage in various fields. Especially in the field of electric vehicles and energy storage, batteries have become the mainstream energy storage method due to their high power and high energy characteristics. In electric vehicles, batteries are usually packaged to form battery modules, and then multiple battery modules are connected in series or in parallel to increase the energy density of the battery. In energy storage systems, battery modules are used to achieve parallel and series connection between multiple batteries, and at the same time realize electrical connection and cooling between battery modules and external devices.

[0003] Battery module PACK packaging is a packaging method that assembles multiple battery cells together to form an overall module. PACK packaging usually uses a special shell and heat dissipation structure to ensure that the battery module can effectively dissipate heat during operation and avoid safety hazards caused by overheating. In addition, PACK packaging can also include a battery management system (BMS) and other electronic controllers to monitor and manage the battery module. This packaging method is widely used in electric vehicles, energy storage systems and other fields that require large-capacity batteries.

[0004] As the energy density of batteries increases, the size and weight of battery modules also increase. In order to ensure the reliability of battery modules, battery modules are usually stacked to increase their size. This stacking method usually includes stacking multiple layers of batteries or stacking multiple battery modules, thereby increasing the size and weight of battery modules.

[0005] However, the stacking method of battery modules adopted by the battery module PACK packaging has some disadvantages. The structure of the battery module PACK packaging is relatively complex and the cost is relatively high. In addition, multiple stacked batteries are packaged with a shell structure. The single battery module formed after packaging occupies a large volume, resulting in low space utilization of the battery cluster formed by combining multiple battery modules and low battery energy density. Utility Model Content

[0006] The main purpose of the utility model is to provide a battery cluster and an energy storage system, which can reduce the volume of the battery module, improve the space utilization rate of the battery cluster, and improve the battery energy density.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery cluster is provided, comprising a plurality of battery modules stacked along a height direction, the battery module comprising a battery cell, two module end plates arranged on opposite sides of the battery cell, and a pole ear located on one side of the battery cell, wherein in the height direction, the module end plates of two adjacent battery modules abut against each other, and there is a preset interval between two adjacent battery cells that can accommodate the pole ear.

[0008] Furthermore, the sum of the height of the battery cell and the height of the tab is smaller than the height of the module end plate at the abutment position.

[0009] Furthermore, the bottom of the module end plate protrudes downward to form a bottom protruding portion, and the bottom protruding portion of the module end plate abuts against the top of the adjacent module end plate.

[0010] Furthermore, the top of the module end plate protrudes upward to form a top protruding portion, and the top protruding portion of the module end plate abuts against the bottom of the adjacent module end plate.

[0011] Furthermore, two opposite sides of the module end plate along the height direction are both planar structures, and the adjacent surfaces of two adjacent module end plates are in abutment with each other.

[0012] Furthermore, the battery unit also includes a force transmission component, which is sleeved outside the battery unit and the module end plate, and the battery unit is fixed to the module end plate by the force transmission component.

[0013] Furthermore, a liquid cooling assembly is provided on one side of the battery unit, and the liquid cooling assembly cooperates with the module end plate to support the battery unit.

[0014] Furthermore, the liquid cooling assembly includes a support member and a liquid cooling tube. A mounting groove is provided on one side of the support member facing the battery unit. The liquid cooling tube is arranged in the mounting groove. The top surface of the liquid cooling tube protrudes out of the mounting groove or is flush with the top of the mounting groove.

[0015] Furthermore, a thermally conductive adhesive is provided between the liquid cooling tube and the bottom surface of the battery unit; and / or, an insulation layer is provided between the liquid cooling tube and the groove wall of the mounting groove, and the liquid cooling tube and the groove wall of the mounting groove are separated by the insulation layer.

[0016] Furthermore, the support member is a sheet metal member, and an insulating material is provided on the surface of the support member. The liquid cooling pipe includes a liquid inlet and a liquid outlet, and water inlet fixing members are fixedly provided at the liquid inlet and the liquid outlet, respectively. The water inlet fixing member includes a connecting ear plate arranged parallel to the module end plate, and the connecting ear plate is fixedly connected to the module end plate. A fitting gap is formed between the upper and lower adjacent module end plates, and the end of the support member is located in the fitting gap. The liquid inlet and the liquid outlet are both located on the outside of the module end plate.

[0017] Furthermore, among two adjacent module end plates, a protrusion and a positioning pin set on the protrusion are set on the top or bottom of one of the module end plates, and a positioning hole is set on the side of the other module end plate close to the positioning pin. The positioning pin of one module end plate forms a plug-in fit with the positioning hole of the other module end plate, and the two adjacent module end plates are abutted and fitted through the protrusion.

[0018] Furthermore, the battery cluster also includes a fixed frame, which includes a load-bearing bracket, a column and a longitudinal beam. The load-bearing bracket is arranged at the bottom of multiple battery modules, the column is installed on the load-bearing bracket, the module end plate of each battery module is fixedly connected to the column, and the longitudinal beam is connected between at least two adjacent columns.

[0019] Furthermore, the number of columns of battery modules is ≥2, and in two adjacent battery modules located on the same layer, two module end plates located on the same side are both provided with a sink, and the bottom of the sink is provided with a connecting hole, and a connecting piece is provided in the sink of the two adjacent battery modules, and the connecting piece is fixedly connected to the two adjacent battery modules through the connecting hole.

[0020] According to another aspect of the present invention, an energy storage system is provided, comprising a battery cluster, wherein the battery cluster is the above-mentioned battery cluster.

[0021] Applying the technical solution of the utility model, the battery cluster includes a plurality of battery modules stacked along the height direction, the battery module includes a battery cell, two module end plates arranged on opposite sides of the battery cell, and a pole ear located on the top of the battery cell. In the height direction, the module end plates of two adjacent battery modules abut against each other, and there is a preset interval between adjacent battery cells. The adjacent battery modules of the battery cluster are abutted by module end plates, so that the force transmission between each battery module is realized through the module end plates of the adjacent battery modules. The module end plates can be used to realize the force transmission between adjacent battery modules, and the module end plates are used to support each battery module, which has better structural rigidity and avoids problems such as battery cell damage caused by battery cell load-bearing, simplifies the structure of the battery module and reduces the cost of the battery module. Since the battery modules are stacked directly by abutting the module end plates, the shell structure is eliminated and a smaller space is occupied, so that the battery modules can be directly stacked up and down, thereby improving the space utilization and the energy density of the battery. Since the adjacent module end plates form a preset interval between adjacent battery cells when abutting, the upper pole ears can have sufficient assembly space, and can be converged at the upper part of the battery cell, which is convenient for stacking the battery modules and effectively protects the pole ear structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 A schematic diagram showing the three-dimensional structure of a battery module according to an embodiment of the present utility model is shown;

[0024] Figure 2 A schematic diagram of the exploded structure of a liquid cooling assembly according to an embodiment of the present utility model is shown;

[0025] Figure 3 A schematic diagram showing the separation structure of a battery unit and a liquid cooling assembly according to an embodiment of the utility model is shown;

[0026] Figure 4 A schematic diagram showing the separation structure of a battery unit and a liquid cooling assembly according to an embodiment of the utility model is shown;

[0027] Figure 5 The figure shows the assembly structure of the battery module and the load-bearing bracket of the embodiment of the utility model;

[0028] Figure 6 A schematic diagram showing the separation structure of a battery unit and a liquid cooling assembly according to an embodiment of the utility model is shown;

[0029] Figure 7 A schematic diagram of the exploded structure of a liquid cooling assembly according to an embodiment of the present utility model is shown;

[0030] Figure 8 A schematic diagram of the three-dimensional structure of a battery cluster according to an embodiment of the utility model is shown;

[0031] Fig. 9 A schematic diagram of the assembly structure of a battery cluster according to an embodiment of the utility model is shown;

[0032] Fig.10 A schematic diagram showing the structure of a battery cluster according to an embodiment of the utility model is shown;

[0033] Fig.11 A schematic diagram showing the side structure of a battery cluster according to an embodiment of the present utility model is shown; and

[0034] Fig.12 A schematic side view of the structure of a battery cluster according to an embodiment of the utility model is shown.

[0035] The above drawings include the following reference numerals:

[0036] 1. Battery unit; 2. Module end plate; 3. Locating pin; 4. Locating hole; 5. Fixed frame; 6. Load-bearing bracket; 7. Column; 8. Longitudinal beam; 9. Flanging; 10. Fixing hole; 11. Welding angle piece; 12. Liquid cooling assembly; 13. Support member; 14. Liquid cooling pipe; 15. Mounting groove; 16. Thermal conductive adhesive; 17. Insulation layer; 18. Insulating material; 19. Liquid inlet; 20. Liquid outlet; 21. Water inlet fixing member; 22. Connecting ear plate; 23. Fitting gap; 24. Force transmission member; 25. Sink; 26. Connecting member; 27. Connecting hole; 28. Protective cover; 29. ​​Bump; 30. Tray frame; 31. Adjusting screw. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] See also Figures 1 to 12 As shown, the utility model provides a battery cluster. The battery cluster of this embodiment includes a plurality of battery modules stacked along the height direction Z, the battery module includes a battery cell 1, two module end plates 2 arranged on opposite sides of the battery cell 1, and a tab located on one side of the battery cell 1. In the height direction, the module end plates 2 of two adjacent battery modules abut against each other, and there is a preset interval between two adjacent battery cells 1 that can accommodate the tab. In one embodiment, the height of the preset interval is H (see Fig.10 ).

[0039] Adjacent battery modules of the battery cluster are abutted by module end plates 2, so that the force transmission between each battery module is realized through the module end plates 2 of adjacent battery modules, and the module end plates 2 can be used to realize the force transmission between adjacent battery modules, and the module end plates 2 are used to support each battery module, which has better structural rigidity and avoids problems such as damage to the battery cell 1 caused by the load-bearing of the battery cell 1, thereby simplifying the structure of the battery module and reducing the cost of the battery module. Since the battery modules are stacked directly by abutting through the module end plates 2, the shell structure is omitted and a smaller space is occupied, so that the battery modules can be directly stacked up and down, thereby improving the space utilization and the energy density of the battery. Since the adjacent module end plates 2 form a preset interval H between adjacent battery cells 1 while abutting, the upper pole ears can have sufficient assembly space, and can be converged at the upper part of the battery cell 1, which is convenient for stacking the battery modules and effectively protects the pole ear structure.

[0040] In this embodiment, when the pole lug is placed upward or downward, since a preset interval capable of accommodating the pole lug is formed between two adjacent battery cells 1, sufficient setting space can be left for the pole lug, so that when adjacent module end plates 2 are abutted, there will be no contact between adjacent battery cells 1 and the pole lug, thereby achieving effective installation of the pole lug and avoiding interference between the pole lugs of adjacent battery modules and the battery cells 1.

[0041] In one embodiment, the sum of the height of the battery cell 1 and the height of the tab is smaller than the height of the module end plate 2 at the abutment position.

[0042] In this embodiment, when adjacent module end plates 2 are abutted, since the mating height of the abutting module end plates 2 needs to leave space for the setting of the battery cell 1 and the pole lug, it is necessary to ensure that the spatial height supported by the module end plates 2 can be greater than or equal to the sum of the height of the battery cell 1 and the height of the pole lug. Generally speaking, for two module end plates 2 abutting each other, the maximum height they support is located at the abutting position, that is, the height at the abutting position determines the maximum spatial height that the module end plates 2 can support. Therefore, when it is ensured that the sum of the height of the battery cell 1 and the height of the pole lug is less than the height of the module end plates 2 at the abutting position, it can be ensured that after the adjacent module end plates 2 are abutted, a height space sufficient to accommodate the battery cell 1 and the pole lug can be left, thereby achieving the smooth setting of the battery cell 1 and the pole lug and ensuring the smooth assembly of the battery module.

[0043] In one embodiment, along the height direction Z, the bottom of the module end plate 2 protrudes downward to form a bottom protruding portion, and the bottom protruding portion of the module end plate 2 abuts against the top of the adjacent module end plate 2 .

[0044] In this embodiment, along the height direction Z, the top of the module end plate 2 is a planar structure, and a bottom protrusion protruding downward is provided at the bottom. Among adjacent module end plates 2, the bottom protrusion of the module end plate 2 located on the upper side abuts against the top plane of the module end plate 2 located on the lower side, thereby forming a supporting gap between adjacent module end plates 2. The supporting gap forms a preset gap between adjacent battery cells 1, thereby accommodating the pole ears.

[0045] The bottom protrusion can be integrally formed with the module end plate 2, or can be separately formed and then fixedly connected to the bottom of the module end plate 2, and the connection method is, for example, bolt connection or plug-in connection.

[0046] In one embodiment, along the height direction Z, the top of the module end plate 2 protrudes upward to form a top protruding portion, and the top protruding portion of the module end plate 2 abuts against the bottom of the adjacent module end plate 2 .

[0047] In this embodiment, the bottom of the module end plate 2 is a plane structure, and a top protrusion protruding upward is provided on the top. In this way, among two adjacent module end plates 2, the top protrusion of the module end plate 2 located at the lower side abuts against the bottom plane of the module end plate 2 located at the upper side, thereby forming a support interval between adjacent module end plates 2, and the support interval forms a preset interval between adjacent battery cells 1, so as to accommodate the tabs.

[0048] The top protrusion can be integrally formed with the module end plate 2, or can be separately formed and then fixedly connected to the top of the module end plate 2, and the connection method is, for example, bolt connection or plug-in connection.

[0049] In one embodiment, the top and the bottom of the module end plate 2 are both planar structures, and the adjacent surfaces of two adjacent module end plates 2 are in abutment with each other.

[0050] In this embodiment, the top and bottom of the module end plate 2 are both flat, the overall height of the module end plate 2 is set relatively high, and the height of a single module end plate 2 is greater than the sum of the height of the battery cell 1 and the height of the pole lug, so that a single module end plate 2 can support the space required for the battery cell 1 and the pole lug, thereby meeting the installation requirements of the battery cell 1 and the pole lug.

[0051] In one embodiment, a protrusion is provided on the top or bottom of the module end plate 2 , and the height of the protrusion relative to the module end plate 2 is adjustable.

[0052] In this embodiment, the protrusion is arranged independently of the module end plate 2 and can be displaced relative to the module end plate 2, so as to adjust the protrusion height of the protrusion on the module end plate 2, and then adjust the support height of the module end plate 2, so that the height of the module end plate 2 can adapt to the sum of the height of the battery cell 1 and the height of the pole ear, meet the design requirements of more types of battery cells 1 and pole ears, and improve the adaptability of the module end plate 2.

[0053] In one embodiment, a threaded hole is provided on the module end plate 2, and the protrusion is an adjusting screw 31 installed in the threaded hole. The adjusting screw 31 is threadably matched with the threaded hole. By rotating the adjusting screw 31, the supporting height of the adjusting screw 31 on the module end plate 2 can be adjusted.

[0054] In one embodiment, the battery cell 1 further includes a force transmission member 24 , which is sleeved outside the battery cell 1 and the module end plate 2 , and the battery cell 1 is fixed to the module end plate 2 by the force transmission member 24 .

[0055] In this embodiment, by providing a force transmission member 24, the battery cell 1 can be fixed on the module end plate 2, so that the force of the battery cell 1 can be transmitted to the module end plate 2, and then the force of the battery module is transmitted by abutting the adjacent module end plates 2, so that the force of the battery module is basically transmitted by the module end plate 2, and gravity or other forces are concentrated on the module end plate 2, which simplifies the force transmission structure and improves the rigidity by utilizing the force transmission of the module end plate 2, thereby forming effective protection for the battery cell 1 and the tabs.

[0056] In one embodiment, the force transmission member 24 is a fixing belt, which is tied to the periphery of the battery cell 1 and the module end plate 2 to bind and fix the battery cell 1 and the module end plate 2 so that the overall force of the battery module is concentrated on the module end plate 2.

[0057] In one embodiment, the battery unit 1 includes a plurality of battery cells stacked along the length direction X. The plurality of battery cells are stacked along the length direction X to form a rectangular battery unit 1, which is more convenient for installing the module end plate 2 and stacking the battery modules.

[0058] In one embodiment, a liquid cooling assembly 12 is disposed at the bottom of the battery unit 1 , and the liquid cooling assembly 12 cooperates with the module end plate 2 to support the battery unit 1 .

[0059] In this embodiment, a liquid cooling assembly 12 is provided at the bottom of the battery cell 1. The liquid cooling assembly 12 is in contact with the battery cell 1, which can not only reduce the risk of thermal runaway of the battery module, but also can utilize the liquid cooling assembly 12 and the module end plate 2 to support the battery cell 1, thereby improving the rigidity of the battery module.

[0060] In one embodiment, the liquid cooling assembly 12 includes a support member 13 and a liquid cooling tube 14. The support member 13 is provided with a mounting groove 15 on the side facing the battery cell. The liquid cooling tube 14 is arranged in the mounting groove 15. The top surface of the liquid cooling tube 14 protrudes out of the mounting groove 15 or is flush with the top of the mounting groove 15.

[0061] In this embodiment, the liquid cooling tube 14 adopts a coil structure, which can form a more sufficient contact with the battery cell 1, and improve the heat dissipation effect of the liquid cooling tube 14 on the battery cell 1. The support member 13 has high rigidity and is supported at the bottom of the battery cell 1, which can ensure the support effect on the battery cell 1. The support member 13 is provided with a mounting groove 15, which can provide space for the installation of the liquid cooling tube 14 and facilitate the installation of the liquid cooling tube 14. The top surface of the liquid cooling tube 14 protrudes from the mounting groove 15 or is flush with the top surface of the mounting groove 15, which can ensure that the liquid cooling tube 14 is in full contact with the battery cell 1, and ensure the heat conduction efficiency from the battery cell 1 to the liquid cooling tube 14.

[0062] In this embodiment, the liquid cooling assembly 12 adopts an integrated design in which the support 13 is fixed to the bottom of a single battery cell 1, which reduces the risk of thermal runaway of the battery module while improving the rigidity of the battery module, facilitating modular maintenance and replacement of a single module and its liquid cooling pipeline.

[0063] In one embodiment, the support member 13 is a sheet metal structure, which can be directly formed by sheet metal stamping, and is easy to manufacture, simple in process, and low in cost.

[0064] In one embodiment, a thermal conductive adhesive 16 is provided between the liquid cooling tube 14 and the bottom surface of the battery cell 1; and / or, an insulation layer 17 is provided between the liquid cooling tube 14 and the groove wall of the mounting groove 15, and the liquid cooling tube 14 and the groove wall of the mounting groove 15 are separated by the insulation layer 17.

[0065] In this embodiment, by providing a thermal conductive adhesive 16 on the contact surface of the liquid cooling tube 14 with the battery cell 1, the cooling efficiency of the liquid cooling tube 14 can be improved. By providing an insulating layer 17 between the liquid cooling tube 14 and the groove wall of the mounting groove 15, the heat transfer between the liquid cooling tube 14 and the groove wall of the mounting groove 15 can be isolated, thereby avoiding condensation on the lower side of the liquid cooling tube 14 and causing damage to the battery module.

[0066] In one embodiment, the liquid cooling assembly 12 includes a tray frame 30 and a liquid cooling tube 14, and a mounting groove 15 is provided on the tray frame 30, and the liquid cooling tube 14 is installed in the mounting groove 15. In this embodiment, the tray frame 30 is formed by assembling a plurality of rectangular steels, and the rectangular steels are fixedly connected by bolts or the like, and mounting grooves 15 are formed between adjacent rectangular steels, and an avoidance groove is provided on the rectangular steel matched with the liquid cooling tube 14, so that the bent portion of the liquid cooling tube 14 can be placed in the avoidance groove, so as to facilitate the installation and fixation of the liquid cooling tube 14 in the tray frame 30.

[0067] In one embodiment, the support member 13 is a sheet metal member, and the surface of the support member 13 is provided with an insulating material 18. The liquid cooling pipe 14 includes a liquid inlet 19 and a liquid outlet 20. The liquid inlet 19 and the liquid outlet 20 are respectively fixed with water inlet fixing members 21. The water inlet fixing member 21 includes a connecting ear plate 22 arranged parallel to the module end plate 2. The connecting ear plate 22 is fixedly connected to the module end plate 2. A fitting gap 23 is formed between the upper and lower adjacent module end plates 2. The end of the support member 13 is located in the fitting gap 23, and the liquid inlet 19 and the liquid outlet 20 are both located on the outside of the module end plate 2.

[0068] In this embodiment, by providing an insulating material 18 on the surface of the support member 13, insulation can be formed between the support member 13 and the battery cell 1, short circuit phenomenon can be avoided, and the safety of the battery module can be improved. The water inlet fixing member 21 is fixedly arranged at the liquid inlet 19 and the liquid outlet 20, which is convenient for installing and fixing the liquid inlet 19 and the liquid outlet 20. The water inlet fixing member 21 includes a connecting ear plate 22, and the connecting ear plate 22 is arranged parallel to the module end plate 2, which is convenient for installing and fixing the connecting ear plate 22 on the module end plate 2. The water inlet fixing member 21 also includes a mounting plate, and the mounting plate and the connecting ear plate 22 form an L-shaped structure. The mounting plate is arranged horizontally, and the liquid inlet 19 and the liquid outlet 20 are penetrated in the mounting plate and installed and fixed by the mounting plate. The provision of the water inlet fixing member 21 can facilitate the installation and fixation of the liquid cooling component 12 on the module end plate 2.

[0069] In addition, by providing the water inlet fixing member 21, the structural strength of the liquid cooling pipe 14 can be improved, and deformation of the end of the liquid cooling pipe 14 during the plugging and unplugging of the inlet and outlet connecting pipes can be avoided.

[0070] In one embodiment, the nozzle fixing member 21 and the supporting member 13 are connected by bolts or fixed by welding.

[0071] A matching gap 23 is formed between the upper and lower adjacent module end plates 2, which can facilitate the end of the support member 13 to pass through the module end plate 2, not only to further support the module end plate 2, but also to enable the liquid inlet 19 and the liquid outlet 20 to be located outside the module end plate 2, which is convenient for connection with an external waterway. The matching gap 23 can be formed by the protrusion on the module end plate 2 and the adjacent module end plate 2.

[0072] In one embodiment, among two adjacent module end plates 2, a protrusion 29 and a positioning pin 3 arranged on the protrusion 29 are arranged on the top or bottom of one of the module end plates 2, and a positioning hole 4 is arranged on the side of the other module end plate 2 close to the positioning pin 3, and the positioning pin 3 of one module end plate forms a plug-in fit with the positioning hole 4 of the other module end plate, and the two adjacent module end plates 2 are abutted and fitted through the protrusion 29.

[0073] In this embodiment, by providing a positioning pin 3, the positioning pin 3 can be used to cooperate with the positioning hole 4 on the adjacent module end plate 2 to achieve plug-in fit between adjacent module end plates 2, which is convenient for positioning and guiding when installing adjacent battery modules. By providing a protrusion 29 on the module end plate 2, a protrusion can be formed on the module end plate 2, which is convenient for abutting fit between adjacent module end plates 2. By providing the positioning pin 3 on the protrusion 29, it is convenient to facilitate the assembly between adjacent module end plates 2, and the positioning position and abutting position between adjacent module end plates 2 can be coincided, so that the positioning pin 3 is located at the highest position of the module end plate 2, ensuring rapid positioning and installation between adjacent module end plates 2.

[0074] In one embodiment, the battery cluster also includes a fixed frame 5, which includes a load-bearing bracket 6, a column 7 and a longitudinal beam 8. The load-bearing bracket 6 is arranged at the bottom of multiple battery modules, and the column 7 is installed on the load-bearing bracket 6. The module end plate 2 of each battery module is fixedly connected to the column 7, and the longitudinal beam 8 is connected between at least two adjacent columns 7.

[0075] In this embodiment, by setting a fixed frame 5, a frame structure can be formed around the battery modules stacked up and down, and the battery modules can be installed and fixed, thereby ensuring the stability of the stacking structure of the battery modules, improving the overall rigidity of the battery cluster, and improving the structural stability of the battery cluster.

[0076] The load-bearing bracket 6 is supported at the bottom of the stacked battery modules to support all the battery modules. The columns 7 are arranged on the peripheral sides of the battery modules to limit the peripheral sides of the battery modules. The longitudinal beams 8 are connected between adjacent columns 7 so that adjacent columns 7 form an interconnected integral structure. The fixed frame 5 surrounded by the load-bearing bracket 6, the columns 7 and the longitudinal beams 8 has good structural strength and rigidity, and can be connected and fixed with each battery module. It can not only play a role in fixing and limiting the battery modules, but also cooperate with the module end plates 2 to support the battery modules.

[0077] In one embodiment, the module end plate 2 is provided with flanges 9 on both sides in the horizontal direction, and fixing holes 10 are correspondingly provided on the flanges 9 and the columns 7 . Fixing members are provided in the fixing holes 10 , and the fixing members fix the columns 7 and the flanges 9 .

[0078] In this embodiment, flanges 9 are provided at both ends of the module end plate 2 in the width direction Y, and the flanges 9 can be aligned with the fixing holes 10 between the columns 7, and then the fixing flanges 9 and the columns 7 are fixedly connected by fixing members, thereby achieving the connection and fixation between the battery module and the fixing frame 5. The fixing holes are, for example, threaded holes, and the fixing members are, for example, screws or bolts.

[0079] In one embodiment, a protective cover plate 28 is also provided on the top of the battery cell 1. The protective cover plate 28 covers the battery cell 1 and the tabs, and is fixedly connected to the top of the module end plate 2, which can protect the battery cell 1 and the tabs, and can cooperate with the module end plate 2 to effectively improve the overall structural strength of the battery module. The tabs are connected through wires and connected to the battery management system on the side where the module end plate 2 is located, so as to facilitate the collection of signals such as the voltage and temperature of the battery. Since the tabs and the wires connecting the tabs are located in the protective cover plate 28, the tabs and the wires connected to the tabs can be effectively prevented from being damaged by external influences during use, thereby improving the safety and reliability of the tabs and the wires.

[0080] In one embodiment, a welding angle piece 11 is provided on the load-bearing bracket 6 , and the bottom of the column 7 is fixedly connected to the welding angle piece 11 .

[0081] In this embodiment, by arranging welding angle pieces on the load-bearing bracket 6, it is convenient to realize the fixed connection between the column 7 and the load-bearing bracket 6, which can improve the connection strength between the column 7 and the load-bearing bracket 6, provide more effective support for the column 7, and improve the overall structural strength of the fixed frame 5.

[0082] In one embodiment, the number of battery module columns is ≥2, and in two adjacent battery modules located on the same layer, two module end plates 2 located on the same side are both provided with a sink 25, and a connecting hole 27 is provided at the bottom of the sink 25. A connecting piece 26 is provided in the sink 25 of the two adjacent battery modules, and the connecting piece 26 is fixedly connected to the two adjacent battery modules through the connecting hole 27.

[0083] In this embodiment, two adjacent battery modules located on the same layer are arranged along the width direction Y, and a groove 25 is provided on the adjacent sides of the two battery modules, a connecting member 26 is provided in the groove 25, a connecting hole 27 is provided at the bottom of the groove 25, and a connecting hole 27 is also provided on the connecting member 26. When connecting, the connecting member 26 is first placed in the groove 25, and the connecting hole 27 on the connecting member 26 is aligned with the connecting hole 27 in the groove 25, and then a bolt or the like is installed in the connecting hole 27, so that the two adjacent battery modules located on the same layer are fixedly connected together by using the connecting member 26.

[0084] In one embodiment, the connecting member 26 is a connecting sheet metal member.

[0085] In one embodiment, the connecting member 26 may be arranged on the front side of the module end plate 2 , or may be arranged above or below the module end plate 2 , or may be arranged above and below the module end plate 2 at the same time.

[0086] Another embodiment of the present invention further provides an energy storage system, which includes the above-mentioned battery cluster. The energy storage system has all the advantages of the above-mentioned battery cluster, which will not be described in detail here.

[0087] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0088] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0089] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery cluster, characterized in that: The invention comprises a plurality of battery modules stacked in a height direction, wherein the battery module comprises a battery cell (1), two module end plates (2) arranged on opposite sides of the battery cell (1), and a pole ear located on one side of the battery cell (1); in the height direction, the module end plates (2) of two adjacent battery modules are in contact with each other, and a preset interval capable of accommodating the pole ear is provided between two adjacent battery cells (1).

2. The battery cluster according to claim 1, characterized in that: The sum of the height of the battery unit (1) and the height of the pole lug is smaller than the height of the module end plate (2) at the abutment position.

3. The battery cluster according to claim 2, characterized in that: The bottom of the module end plate (2) protrudes downward to form a bottom protruding portion, and the bottom protruding portion of the module end plate (2) abuts against the top of the adjacent module end plate (2).

4. The battery cluster according to claim 2, characterized in that: The top of the module end plate (2) protrudes upward to form a top protruding portion, and the top protruding portion of the module end plate (2) abuts against the bottom of the adjacent module end plate (2).

5. The battery cluster according to claim 2, characterized in that: The two opposite sides of the module end plate (2) along the height direction are both planar structures, and the adjacent surfaces of two adjacent module end plates (2) are in abutment with each other.

6. The battery cluster according to claim 2, characterized in that: The battery unit (1) further comprises a force transmission component (24), wherein the force transmission component (24) is sleeved outside the battery unit (1) and the module end plate (2), and the battery unit (1) is fixed to the module end plate (2) by the force transmission component (24).

7. The battery cluster according to claim 1, characterized in that: A liquid cooling assembly (12) is provided on one side of the battery unit (1), and the liquid cooling assembly (12) cooperates with the module end plate (2) to support the battery unit (1).

8. The battery cluster according to claim 7, characterized in that: The liquid cooling assembly (12) comprises a support member (13) and a liquid cooling tube (14); a mounting groove (15) is provided on a side of the support member (13) facing the battery unit (1); the liquid cooling tube (14) is arranged in the mounting groove (15); and the top surface of the liquid cooling tube (14) protrudes from the mounting groove (15) or is flush with the top of the mounting groove (15).

9. The battery cluster according to claim 8, characterized in that: A heat-conducting adhesive (16) is provided between the liquid cooling tube (14) and the bottom surface of the battery unit (1); and / or a heat-insulating layer (17) is provided between the liquid cooling tube (14) and the groove wall of the installation groove (15), and the liquid cooling tube (14) and the groove wall of the installation groove (15) are separated by the heat-insulating layer (17).

10. The battery cluster according to claim 8, characterized in that: The support member (13) is a sheet metal member, and an insulating material (18) is provided on the surface of the support member (13). The liquid cooling pipe (14) includes a liquid inlet (19) and a liquid outlet (20). The liquid inlet (19) and the liquid outlet (20) are respectively fixedly provided with a water inlet fixing member (21). The water inlet fixing member (21) includes a connecting ear plate (22) arranged parallel to the module end plate (2). The connecting ear plate (22) is fixedly connected to the module end plate (2). A fitting gap (23) is formed between the upper and lower adjacent module end plates (2). The end of the support member (13) is located in the fitting gap (23), and the liquid inlet (19) and the liquid outlet (20) are both located on the outside of the module end plate (2).

11. The battery cluster according to claim 1, characterized in that: Among the two adjacent module end plates (2), a protrusion (29) and a positioning pin (3) arranged on the protrusion (29) are arranged on the top or bottom of one of the module end plates (2), and a positioning hole (4) is arranged on the side of the other module end plate (2) close to the positioning pin (3), and the positioning pin (3) of one of the module end plates (2) and the positioning hole (4) of the other module end plate (2) form a plug-in fit, and the two adjacent module end plates (2) are abutted and fitted through the protrusion (29).

12. The battery cluster according to any one of claims 1 to 11, characterized in that: The battery cluster further comprises a fixed frame (5), the fixed frame (5) comprising a load-bearing bracket (6), a column (7) and a longitudinal beam (8), the load-bearing bracket (6) being arranged at the bottom of the plurality of battery modules, the column (7) being mounted on the load-bearing bracket (6), the module end plate (2) of each of the battery modules being fixedly connected to the column (7), and the longitudinal beam (8) being connected between at least two adjacent columns (7).

13. The battery cluster according to any one of claims 1 to 11, characterized in that: The number of rows of the battery modules is ≥ 2, and in two adjacent battery modules located in the same layer, two module end plates (2) located on the same side are both provided with a sink (25), a connection hole (27) is provided at the bottom of the sink (25), and a connecting piece (26) is provided in the sink (25) of the two adjacent battery modules, and the connecting piece (26) is fixedly connected to the two adjacent battery modules through the connection hole (27).

14. An energy storage system, comprising a battery cluster, characterized in that: The battery cluster is the battery cluster according to any one of claims 1 to 13.

Images