Soft package module structure for liquid cooling energy storage

Abstract

The utility model relates to the technical field of lithium ion battery soft package modules, in particular to a soft package module structure for liquid cooling energy storage. Comprising a battery cell group which is formed by circularly stacking battery cells and composite foam; the end plates are arranged at the two ends of the battery cell group and are used for clamping the battery cell group; the plurality of steel belts are used for pressing the battery cell groups and the end plates; the tab bracket is vertically and fixedly connected with the end plate; and the liquid cooling plate is fixedly connected with the battery cell group through heat-conducting glue. The internal battery cell group is designed to be formed by cyclically stacking the battery cells and the composite foam, and the heat-conducting glue is used at the medicine bags at the bottoms of the battery cells to be in contact with the liquid cooling plate for heat dissipation, so that the utilization rate of the axial stacking space of the battery cell group is higher, the structure is simpler, and the manufacturing, transportation and maintenance costs are also greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion battery soft-pack modules, in particular to a soft-pack module structure for liquid-cooled energy storage. Background Art

[0002] A soft-pack battery cell module is a module formed by multiple battery cells being packaged together in the same outer shell frame and connected to the outside through a unified boundary. With the increasing demand for electric energy in daily life and production, the application of soft-pack battery cell modules is becoming more and more extensive. Although the soft-pack battery cell module can store more electric energy in a small volume, its internal heat dissipation problem requires a better solution, otherwise it is easy to overheat and cause the module to fail, and safety is difficult to ensure. In the existing technical solutions, most energy storage soft-pack modules use aluminum sheets for module heat dissipation, and the heat dissipation aluminum sheet is directly assembled in the module as a part.

[0003] For example, the patent document with the announcement number CN206353554U discloses a soft-pack module water-cooling structure of a soft-pack battery cooling system for electric vehicles. In order to solve the problems that the aluminum-plastic film as an external protection is easy to be punctured during the assembly process, the size difference is large, the assembly process is complicated, and the heat of the battery cell is difficult to dissipate, etc., it includes a photo frame, which is characterized in that a soft-pack battery cell is arranged in the photo frame, an insulating water-cooled heat dissipation aluminum sheet is arranged on one side of the soft-pack battery cell, and a foam foam is arranged on the other side of the soft-pack battery cell; a group of soft-pack batteries are connected in series and parallel to form: insulating water-cooled heat dissipation aluminum sheet + soft-pack battery cell + foam foam + insulating water-cooled heat dissipation aluminum sheet... circulation structure; the end plate is provided with a coolant inlet and outlet, and the coolant forms a liquid flow loop inside the module. The heat dissipation effect is good and the battery life is long.

[0004] However, in actual use, due to the stacking of the middle battery pack, the structure adopts an insulated water-cooled heat sink aluminum sheet + soft-pack battery cell + foam cotton + insulated water-cooled heat sink aluminum sheet... circulation structure. The internal insulated cooling heat sink aluminum sheet is equipped with many capillaries for passing cooling water to dissipate heat to the battery cell. However, the cost of such a heat sink aluminum sheet is very high, and when the cooling system has problems, it is difficult to repair. Utility Model Content

[0005] The purpose of the utility model is to provide a soft-pack module structure for liquid-cooled energy storage, so that the soft-pack energy storage module structure has good heat dissipation effect and a simpler structure, thereby reducing the cost of manufacturing, transportation and maintenance.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a soft-pack module structure for liquid-cooled energy storage, characterized in that it includes a battery cell group, which is formed by cyclic stacking of battery cells and composite foam; end plates, which are arranged at both ends of the battery cell group to clamp the battery cell group; a number of steel belts, which compress the battery cell group and the end plates; a pole ear bracket, which is vertically fixedly connected to the end plate; and a liquid cooling plate, which is fixedly connected to the battery cell group through a thermal conductive adhesive. The internal battery cell group is designed to be formed by cyclic stacking of battery cells and composite foam. Thermal conductive adhesive is used at the medicine bag at the bottom of the battery cell to contact the liquid cooling plate for heat dissipation, which can make the space utilization rate of the axial stacking of the battery cell group higher, and the structure is simpler, while the cost of manufacturing, transportation and maintenance is also greatly reduced. In addition, since both sides of the battery cell in the battery cell group are composite foam, both sides are flexible structures, which can also prevent the battery cell from expanding outward when overheating and being scratched, causing safety hazards.

[0007] Preferably, the end plate is a hollow grid structure; a steel belt slot is provided at the edge of the end plate to prevent the steel belt from sliding; and a plurality of through holes are provided on the side of the end plate close to the pole ear bracket. The grid-like hollow design of the end plate can improve the heat dissipation effect while ensuring that the entire end surface of the battery cell group is subjected to uniform force. The steel belt slot limits the displacement of the steel belt, making the structure of the battery cell group more stable, and the battery cell and the composite foam inside are not easy to move, so as to prevent damage to the battery cell pole ear and the pole ear bracket due to movement between the battery cell and the composite foam when subjected to external force.

[0008] Preferably, a clamping plate perpendicular to the pole lug bracket is provided at the edge of the pole lug bracket; a fixing plate perpendicular to the clamping plate is provided at one end of the clamping plate away from the pole lug bracket; a reinforcing rib perpendicular to the fixing plate and integrally connected to the clamping plate is provided on the fixing plate; and two reinforcing ribs are provided. The clamping plates are provided on the edges of the pole lug bracket close to the two end plates, and can clamp the two ends of the battery cell group. And by providing a fixing plate perpendicular to the clamping plate on the clamping plate, and fixedly connected to the upper edge of the end plate, the pole lug bracket and the end plate are fixed to press the battery cell group. The reinforcing rib is welded on the clamping plate of the pole lug bracket in a direction perpendicular to the direction of the pole lug bracket, and one end of the reinforcing rib is connected to the copper busbar provided on the pole lug bracket, and the other end is connected to the fixing plate, so as to ensure the strength at the connection and prevent it from being deformed.

[0009] Preferably, a buckle structure is provided between the two reinforcing ribs; the opening direction of the buckle structure is perpendicular to the plane where the tab bracket is located; the buckle structure is connected to a plug-in connector; a flexible circuit board is provided in the plug-in connector. The buckle structure is designed between the reinforcing ribs so that the buckle structure is not easily damaged by bumps during daily use. The opening of the buckle structure is arranged perpendicular to the tab bracket to save space in the length direction of the module. The connector is placed vertically for easy disassembly and assembly, which can also save space in the length direction of the module and is beneficial to the overall design of the battery pack.

[0010] Preferably, the tab bracket is provided with a plurality of tab slots; the cell tab is provided on one side of the cell close to the tab bracket; the cell tab passes through the tab slot and is bent and fixed to the tab bracket. The cell tab passes through the tab slot and is bent and fixed to the copper bar above the tab slot, so that the current of each cell is gathered together, and the copper bar can also play a heat dissipation role.

[0011] Preferably, a cell pack is provided at one end of the cell away from the tab support; a liquid cooling plate is provided below the cell pack; and a layer of thermal conductive adhesive is applied between the cell pack and the liquid cooling plate. The heat of the cell group is gathered through the cell pack and then directly contacts the liquid cooling plate through the thermal conductive adhesive to achieve the purpose of conducting heat out of the cell.

[0012] Preferably, a cover plate is provided on the upper end of the tab bracket. The cover plate is a plastic cover plate, which can be processed by extrusion process. When the length of the module changes, there is no need to re-open the mold, which reduces costs. The cover plate can prevent the upper part of the module from being electrically conductive with the outside, ensuring insulation performance.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. This solution directly manages the heat of the module through a liquid cooling system, with a small temperature difference inside the module and high efficiency.

[0015] 2. By optimizing the design of components within the module, the overall cost of the module is reduced and the module production efficiency is also improved.

[0016] 3. The structure is optimized to achieve lightweight design and facilitate module disassembly, assembly and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.

[0018] Figure 2 It is a left view of a specific embodiment of the utility model.

[0019] Figure 3 for Figure 2 A partial enlarged view of .

[0020] Figure 4 It is a structural schematic diagram of the pole ear bracket of the utility model.

[0021] Figure 5 It is a left view of the pole ear bracket of the utility model.

[0022] Figure 6 It is a structural schematic diagram of the buckle structure of the utility model.

[0023] In the figure: 1. battery cell group; 2. battery cell; 3. composite foam; 4. end plate; 5. steel belt; 6. pole ear bracket; 7. steel belt slot; 8. clamping plate; 9. fixing plate; 10. buckle structure; 11. flexible circuit board; 12. pole ear slot; 13. battery cell pole ear; 14. battery cell medicine bag; 15. cover plate; 16. reinforcing rib; 17. connector. DETAILED DESCRIPTION

[0024] The specific implementation of the technical solution of the utility model is further described below through examples and in conjunction with the accompanying drawings.

[0025] See also Figure 1-6 , an embodiment provided by the utility model:

[0026] A soft pack module structure for liquid-cooled energy storage includes a battery cell group 1, which is formed by cyclic stacking of battery cells 2 and composite foam 3; end plates 4, which are arranged at both ends of the battery cell group 1 and clamp the battery cell group 1; a plurality of steel strips 5, which compress the battery cell group 1 and the end plates 4; a pole ear bracket 6, which is vertically fixedly connected to the end plates 4; and a liquid cooling plate, which is fixedly connected to the battery cell group 1 through a thermal conductive adhesive. The internal battery cell group 1 is designed to be formed by cyclic stacking of battery cells 2 and composite foam 3, and thermal conductive adhesive is used at the medicine bag at the bottom of the battery cell 2 to contact with the liquid cooling plate for heat dissipation, which can make the space utilization rate of the axial stacking of the battery cell group 1 higher, and the structure is simpler, while the cost of manufacturing, transportation and maintenance is greatly reduced. In addition, since there are composite foam 3 on both sides of the battery cell 2 in the battery cell group 1, both sides are flexible structures, which can also prevent the battery cell 2 from expanding outward when overheating and being scratched, causing safety hazards. The end plate 4 is a hollow grid structure; a steel belt slot 7 is provided at the edge of the end plate 4 to prevent the steel belt 5 from sliding; and a plurality of through holes are provided on the side of the end plate 4 close to the pole ear bracket 6. The grid-shaped hollow design of the end plate 4 can improve the heat dissipation effect while ensuring that the entire end surface of the battery cell group 1 is subjected to uniform force. The steel belt slot 7 limits the displacement of the steel belt 5, making the structure of the battery cell group 1 more stable, and the battery cell 2 and the composite foam 3 inside it are not easy to move, so as to prevent the battery cell pole ear 13 and the pole ear bracket 6 from being damaged due to the movement between the battery cell 2 and the composite foam 3 when subjected to external force.

[0027] A clamping plate 8 perpendicular to the tab bracket 6 is provided at the edge of the tab bracket 6; a fixing plate 9 perpendicular to the clamping plate 8 is provided at one end of the clamping plate 8 away from the tab bracket 6; a reinforcing rib 16 perpendicular to the fixing plate 9 and integrally connected to the clamping plate 8 is provided on the fixing plate 9; two reinforcing ribs 16 are provided. The clamping plate 8 is provided on the edge of the tab bracket 6 close to the two end plates 4, and can clamp the two ends of the battery cell group 1. And by providing a fixing plate 9 perpendicular to the clamping plate 8 on the clamping plate 8, and fixedly connected to the upper edge of the end plate 4, the tab bracket 6 and the end plate 4 are fixedly pressed against the battery cell group 1. The reinforcing rib 16 is welded on the clamping plate 8 of the tab bracket 6, and the direction is perpendicular to the tab bracket 6, and one end of the reinforcing rib 16 is connected to the copper bar provided on the tab bracket 6, and the other end is connected to the fixing plate 9, so as to ensure the strength at the connection and make it not easy to deform. A snap-on structure 10 is provided between the two reinforcing ribs 16; the opening direction of the snap-on structure 10 is perpendicular to the plane where the pole ear bracket 6 is located; the snap-on structure 10 is connected to a plug-in connector 17; a flexible circuit board 11 is provided in the plug-in connector 17. The snap-on structure 10 is designed between the reinforcing ribs 16 so that the snap-on structure 10 is not easily damaged by bumps during daily use. The opening of the snap-on structure 10 is arranged perpendicular to the pole ear bracket 6 to save space in the length direction of the module. The connector is placed vertically for easy disassembly and assembly, which can also save space in the length direction of the module and facilitate the overall design of the battery pack. A plurality of pole ear slots 12 are provided on the pole ear bracket 6; a cell pole ear 13 is provided on the side of the battery cell 2 close to the pole ear bracket 6; the cell pole ear 13 passes through the pole ear slot 12 and is bent and fixed to the pole ear bracket 6. The cell pole ear 13 passes through the pole ear slot 12 and is bent and fixed to the copper bar above the pole ear slot 12, so that the currents of each battery cell 2 are gathered together, and the use of the copper bar can also play a heat dissipation role. A cell medicine bag 14 is provided at one end of the cell 2 away from the tab bracket 6; a liquid cooling plate is provided below the cell medicine bag 14; and a layer of thermal conductive adhesive is applied between the cell medicine bag 14 and the liquid cooling plate. The heat of the cell group 1 is gathered through the cell medicine bag 14, and then directly contacts the liquid cooling plate through the thermal conductive adhesive to achieve the purpose of conducting the heat in the cell 2. A cover plate 15 is provided at the upper end of the tab bracket 6. The cover plate 15 is a plastic cover plate 15, which can be processed by extrusion. When the length of the module changes, there is no need to re-open the mold, which reduces the cost. The cover plate 15 can prevent the top of the module from being conductive and the outside to ensure the insulation performance.

[0028] When installing the module structure, first fix the battery cell 2 and the composite foam 3 into groups through crystal glue, stack them at intervals to the number we need, and then place the end plates 4 on both sides, with plastic end plates 4 at both ends. After wrapping them inside, tighten them by inserting the steel belt 5 into the groove of the end plate 4 to maintain a certain pressure. The pole ear bracket 6 is fixed to the end plates 4 at both ends by buckles, and the battery cell pole ear 13 extends out of the pole ear groove 12 of the pole ear bracket 6 through pre-bending, and the battery cell pole ear 13 is rolled flat and bent. The flexible circuit board 11 is fixed to the buckle structure 10 on the pole ear bracket 6 through the plug-in 17, and then the cover plate 15 is fixed to the pole ear bracket 6 through the buckle structure 10. A groove is set on the cover plate 15 at the copper bar of the pole ear bracket 6, which facilitates positioning during fixed installation, and also opens an air flow channel for heat dissipation for the copper bar. When the module structure is working, the heat is directly exported to the liquid cooling plate by the battery cell medicine bag 14 at the lower end of the battery cell 2 through the pot thermal conductive glue to achieve heat dissipation of the module. The short transfer path and less medium improve the conduction efficiency and enable better heat management. The composite foam 3 is made of polyurethane foam and mica sheet. The composite foam 3 can absorb the size of the battery core 2 after the battery core 2 swells after a certain number of cycles, and has the function of flame retardancy and heat insulation, which can effectively block the diffusion of temperature in the module and improve the safety of the module.

[0029] In addition to the above-mentioned embodiments, within the scope disclosed in the claims and the specification of the utility model, the technical features or technical data of the utility model can be reselected and combined to form new embodiments, which can be achieved by those skilled in the art without creative work. Therefore, these embodiments that are not described in detail in the utility model should also be regarded as specific embodiments of the utility model and within the protection scope of the utility model.

Claims

1. A soft package module structure for liquid cooling energy storage, characterized in that: include: A battery cell group (1) is formed by stacking battery cells (2) and composite foam (3) in a loop; End plates (4) are arranged at two ends of the battery cell group (1) to clamp the battery cell group (1); A plurality of steel strips (5) for pressing the battery cell group (1) and the end plate (4); The pole lug bracket (6) is vertically fixedly connected to the end plate (4); The liquid cooling plate is fixedly connected to the battery cell group (1) via a heat conductive adhesive.

2. A soft package module structure for liquid cooling energy storage according to claim 1, characterized in that: The end plate (4) is a hollow grid-like structure; a steel belt clamping groove (7) is provided at the edge of the end plate (4) to prevent the steel belt (5) from sliding; and a plurality of through holes are provided on one side of the end plate (4) close to the pole lug bracket (6).

3. A soft package module structure for liquid cooling energy storage according to claim 1, characterized in that: A clamping plate (8) perpendicular to the pole lug bracket (6) is provided at the edge of the pole lug bracket (6); a fixing plate (9) arranged perpendicular to the clamping plate (8) is provided at one end of the clamping plate (8) away from the pole lug bracket (6); a reinforcing rib (16) perpendicular to the fixing plate (9) and integrally connected to the clamping plate (8) is provided on the fixing plate (9); two reinforcing ribs (16) are provided.

4. A soft package module structure for liquid cooling energy storage according to claim 3, characterized in that: A snap-fit ​​structure (10) is provided between the two reinforcing ribs (16); the opening direction of the snap-fit ​​structure (10) is perpendicular to the plane where the tab bracket (6) is located; the snap-fit ​​structure (10) is connected to a plug-in connector (17); and a flexible circuit board (11) is provided in the plug-in connector (17).

5. A soft package module structure for liquid cooling energy storage according to claim 4, characterized in that: The pole lug support (6) is provided with a plurality of pole lug grooves (12); a side of the battery cell (2) close to the pole lug support (6) is provided with a battery cell pole lug (13); the battery cell pole lug (13) passes through the pole lug groove (12) and is bent and fixed to the pole lug support (6).

6. A soft package module structure for liquid cooling energy storage according to claim 1, characterized in that: A cell medicine bag (14) is provided at one end of the cell (2) away from the tab support (6); a liquid cooling plate is provided below the cell medicine bag (14); and a layer of heat-conducting glue is coated between the cell medicine bag (14) and the liquid cooling plate.

7. A soft package module structure for liquid cooling energy storage according to any one of claims 1 to 6, characterized in that: A cover plate (15) is provided at the upper end of the pole lug support (6).

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