A double-layer module structure

Abstract

The utility model provides a kind of double-layer module structure, it is related to new energy battery technical field, including first cold plate and second cold plate, the inside of first cold plate and second cold plate is all strip array and has welding fixture, and gap is left between the welding fixture of adjacent top and bottom, and gap is equal, and electric core is installed in welding fixture, and electric core is in stacked arrangement, whole module structure is constituted by the sandwich structure of first cold plate, second cold plate and connecting plate, cooperate cooling radiating plate and heat-absorbing plate surface, realize multiple surface cooling function, significantly improve cooling efficiency.Electric core generated heat is transferred to heat-absorbing plate surface by heat conduction end, and is taken away by cooling liquid flow channel and micro heat dissipation channel high efficiency, simultaneously, first cold plate and second cold plate are synergistically radiated from two sides, effectively reduce the temperature of top pole and busbar area, solve the problem of limited cooling efficiency of single surface cooling scheme in high heat generation scene in background technology.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a double-layer module structure. Background Technology

[0002] As a core component in new energy vehicles and energy storage systems, battery modules directly impact the system's energy density, safety, and lifespan. Battery module design typically employs a multi-layered cell stacking structure, using cooling plates to manage heat dissipation and ensure temperature stability during charging and discharging. Traditional cooling solutions often use single-sided cooling, such as relying solely on bottom or side cooling plates. While this is sufficient for low-power scenarios, it leads to uneven heat distribution during high-rate fast charging and discharging, particularly in areas like the top terminals and busbar, where temperature control is difficult. This results in heat transfer through the cell's internal structure to the stacked components, affecting cell performance and lifespan. Furthermore, current cell stacking methods are relatively simple, resulting in insufficient overall module rigidity and difficulty coping with vibrations and impacts under complex operating conditions. Additionally, traditional modules lack effective venting and spraying mechanisms for thermal runaway management, posing safety hazards.

[0003] The existing battery modules have the following problems when in use: 1. The system has low Z-axis space utilization and limited cooling efficiency, which is limited to a single-sided cooling solution and cannot adapt to high heat generation scenarios, resulting in increased cell temperature and affecting fast charging time and discharge capacity; 2. The module structure has insufficient rigidity, the cells are not fixed stably, and there is a lack of rapid exhaust and cooling methods in case of thermal runaway, which poses a safety risk. Therefore, a double-layer module structure is needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a dual-layer module structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-layer module structure, including a first cold plate and a second cold plate, wherein the inner sides of the first cold plate and the second cold plate are provided with welding clamps in a strip array, and there are gaps between the welding clamps at adjacent top and bottom, and the gaps are equal. Each welding clamp is equipped with a battery cell, and the battery cells are arranged in a stacked manner.

[0006] Preferably, a connecting plate is installed between the battery cells mounted on the first cold plate and the battery cells mounted on the second cold plate.

[0007] Preferably, the connecting plate is hollow inside, and the connecting plate has mounting areas on both the front and back sides. The battery cells on the front side of the connecting plate and the second cold plate are assembled, and the battery cells on the back side of the connecting plate and the first cold plate are assembled.

[0008] Preferably, a cooling plate is snapped onto both the front and back of the connecting plate, and a heat-absorbing plate is installed on both the front and back of the cooling plate, wherein the heat-absorbing plate and the cooling plate are integral.

[0009] Preferably, the top of each cooling plate is provided with a reserved slot, and the reserved slot is square in shape.

[0010] Preferably, both ends of the inner side of the battery cell are provided with heat-conducting ends, and the heat-conducting ends are aligned with the heat-absorbing plate and are in close contact with each other.

[0011] Preferably, the first cold plate, the battery cell, the connecting plate, and the second cold plate constitute a complete sandwich structure module.

[0012] Beneficial effects

[0013] In this invention, the entire module structure utilizes a sandwich structure comprised of a first cold plate, a second cold plate, and a connecting plate. Combined with a cooling and heat-absorbing plate, this achieves multi-faceted cooling, significantly improving cooling efficiency. Heat generated by the battery cell is transferred to the heat-absorbing plate through the heat-conducting end and efficiently dissipated by the coolant flow channels and micro-heat dissipation channels. Simultaneously, the first and second cold plates work together to dissipate heat from both sides, effectively reducing the temperature of the top electrode and busbar area. This solves the problem of limited cooling efficiency in high-heat scenarios with single-sided cooling solutions in the prior art, resulting in a more uniform temperature distribution within the battery cell. This shortens fast-charging time, improves discharge capacity, and extends the battery cell's lifespan.

[0014] In this invention, the double-layer module structure securely fixes the battery cells with welding clamps, and an integrally formed bottom support beam is formed at the bottom of the first and second cold plates, enhancing the overall rigidity of the module and enabling it to withstand vibrations and impacts under complex working conditions, thus solving the problem of insufficient rigidity in the module structure in the prior art. Simultaneously, the spray pattern design with a pre-reserved exhaust channel and coolant flow channel through the slot allows for rapid discharge of high-temperature gas and spraying of coolant to reduce temperature in the event of thermal runaway of the battery cell. Real-time temperature monitoring by a temperature sensor ensures safety, overcoming the shortcomings of traditional modules that lack effective thermal runaway management methods, and significantly improving the safety and reliability of the module. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the overall horizontal orientation of this utility model;

[0017] Figure 3 This is an enlarged view of point A in this utility model;

[0018] Figure 4This is a top view of the entire utility model.

[0019] Legend:

[0020] 1. First cold plate; 2. Connecting plate; 3. Reserved slot; 4. Cooling and heat dissipation plate; 5. Heat-absorbing plate surface; 6. Welding fixture; 7. Battery cell; 8. Installation area; 9. Heat-conducting end; 10. Second cold plate. Detailed Implementation

[0021] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0022] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1:

[0024] Reference Figure 1-4 A double-layer module structure includes a first cold plate 1 and a second cold plate 10. The inner sides of the first cold plate 1 and the second cold plate 10 are each arranged in a strip array with welding clamps 6. There are gaps between adjacent top and bottom welding clamps 6, and the gaps are equal. Each welding clamp 6 is equipped with a battery cell 7, which is arranged in a stacked manner. Multiple sets of battery cells 7 are installed on the first cold plate 1 and the second cold plate 10.

[0025] A connecting plate 2 is installed between the battery cell 7 installed on the first cold plate 1 and the battery cell 7 installed on the second cold plate 10. The connecting plate 2 is hollow inside, and has mounting areas 8 on both its front and back sides. The front side of the connecting plate 2 is assembled with the battery cell 7 on the second cold plate 10, and the back side of the connecting plate 2 is assembled with the battery cell 7 on the first cold plate 1. During assembly, one side of the battery cell 7 is connected to the corresponding cold plate 10, i.e., fixed by welding clamps 6, while the other side is assembled with the connecting plate 2.

[0026] Cooling plates 4 are snapped onto both the front and back of the connecting plate 2. Heat-absorbing surfaces 5 are installed on both the front and back of the cooling plates 4, and the heat-absorbing surfaces 5 and the cooling plates 4 are integrated. In this device, the connecting plate, the first cold plate 1, the second cold plate 10, and the cooling plates 4 all have cooling and heat dissipation functions.

[0027] The top of each cooling plate 4 is provided with a reserved slot 3, which is square in shape.

[0028] Both ends of the inner side of the battery cell 7 are provided with heat-conducting ends 9, which are aligned with the heat-absorbing plate surface 5 and are in close contact with each other.

[0029] The first cold plate 1, the battery cell 7, the connecting plate 2, and the second cold plate 10 constitute a complete sandwich structure module. Specific Implementation Example 2:

[0031] Reference Figure 1-4 The first cold plate 1, the second cold plate 10, and the connecting plate 2 all have coolant channels inside. These channels are rectangular, 3 mm wide, and are embedded within the cold plate 1, the second cold plate 10, and the connecting plate 2, respectively. The coolant channels connect to an external cooling system via external cooling medium inlets and outlets located on the side of the module. These external cooling medium inlets and outlets are circular interfaces with a diameter of 8 mm, made of aluminum alloy with a composite insulating film on the surface to ensure electrical safety. The cooling heat dissipation plate 4 also has miniature heat dissipation channels inside. The miniature heat dissipation channel is connected to the coolant flow channel inside the connecting plate 2. An exhaust channel runs through the reserved slot 3, designed as a 5mm diameter circular pipe that runs longitudinally through the reserved slot 3 at the top of the cooling plate 4. One end of the exhaust channel connects to the hollow structure inside the connecting plate 2, and the other end extends to the outside of the module. The exhaust channel is made of high-temperature resistant PPS plastic to quickly expel high-temperature gases in the event of thermal runaway of the battery cell 7. The exhaust channel is connected to the hollow structure inside the connecting plate 2. In actual operation, a 10mm high terminal post will be installed on the battery cell 7. The cylindrical copper structure has a diameter of 6 mm. The electrode is welded to the top of the cell 7. The busbar is a 2 mm thick copper conductive strip, 20 mm wide, and its length covers the distance between the electrodes of adjacent cells 7. The busbar is fixed to the top of the cooling heat sink 4 by an insulating fastener. The insulating fastener is a PPA clip structure, 5 mm high and 10 mm wide, ensuring electrical isolation between the busbar and the cooling heat sink 4. The temperature sensor is an NTC thermistor type sensor with a diameter of 3 mm, installed on the top of the cooling heat sink 4 and in contact with the heat absorber surface 5. The sensor is connected to the external control system via a signal line, which is a 50 cm long shielded cable with a diameter of 1 mm. The micro heat dissipation channel is designed as a circular channel with a diameter of 1 mm, which is evenly distributed along the inside of the cooling heat dissipation plate 4 and connected to the coolant flow channel of the connecting plate 2. The micro heat dissipation channel is made of aluminum alloy to improve heat conduction efficiency. The bottom support beam is a rectangular aluminum alloy beam with a width of 10 mm and a thickness of 5 mm, which is integrally formed with the bottom of the first cold plate 1 and the second cold plate 10. The bottom support beam 20 is arranged laterally along the bottom of the module with a spacing of 50 mm to enhance the overall rigidity of the module.

[0032] During charging and discharging, the battery cell 7 generates heat, which is transferred to the heat-absorbing plate 5 through the inner heat-conducting end 9. The heat-absorbing plate 5 then conducts the heat to the cooling heat dissipation plate 4. The micro heat dissipation channel inside the cooling heat dissipation plate 4 is connected to the coolant flow channel of the connecting plate 2. The coolant flows into the flow channel and the micro heat dissipation channel through the external cooling medium inlet and outlet, carrying away the heat. At the same time, the first cold plate 1 and the second cold plate 10 cool the battery cell 7 from both sides through the internal coolant flow channel, forming a sandwich structure, which comprehensively improves the heat dissipation efficiency and enhances the rigidity of the module through the bottom support beam. The terminals of the battery cell 7 are electrically connected through the busbar. The busbar is fixed by an insulating fastener to ensure electrical safety. The temperature sensor monitors the temperature of the heat-absorbing plate 5 in real time and transmits it to the external control system through the signal line. If the battery cell 7 experiences thermal runaway, the exhaust channel discharges high-temperature gas through the reserved slot 3. At the same time, the coolant flow channel can be switched to spray mode, spraying coolant through the reserved slot 3 to quickly reduce the temperature of the thermal runaway area.

[0033] In summary:

[0034] 1. In this device, cooling and heat dissipation plates 4 are snapped onto both the front and back of the connecting plate 2. Heat absorption plates 5 are installed on both the front and back of the cooling and heat dissipation plates 4, and the heat absorption plates 5 and the cooling and heat dissipation plates 4 are integrated. In this device, the connecting plate, the first cold plate 1, the second cold plate 10, and the cooling and heat dissipation plates 4 all have cooling and heat dissipation functions.

[0035] The top of each cooling plate 4 is provided with a reserved slot 3, which is square in shape.

[0036] Both ends of the inner side of the battery cell 7 are provided with heat-conducting ends 9, which are aligned with the heat-absorbing plate surface 5 and are in close contact with each other.

[0037] The first cold plate 1, the battery cell 7, the connecting plate 2, and the second cold plate 10 constitute a complete sandwich structure module.

[0038] 2. During the charging and discharging process, the battery cell 7 generates heat. The heat is transferred to the heat-absorbing plate surface 5 through the inner heat-conducting end 9. The heat-absorbing plate surface 5 conducts the heat to the cooling heat dissipation plate 4. The micro heat dissipation channel inside the cooling heat dissipation plate 4 is connected to the coolant flow channel of the connecting plate 2. The coolant flows into the flow channel and the micro heat dissipation channel through the external cooling medium inlet and outlet, carrying away the heat. At the same time, the first cold plate 1 and the second cold plate 10 cool the battery cell 7 from both sides through the internal coolant flow channel, forming a sandwich structure, which comprehensively improves the heat dissipation efficiency and enhances the rigidity of the module through the bottom support beam. The terminal of the battery cell 7 is electrically connected through the busbar. The busbar is fixed by an insulating fastener to ensure electrical safety. The temperature sensor monitors the temperature of the heat-absorbing plate surface 5 in real time and transmits it to the external control system through the signal line. If the battery cell 7 experiences thermal runaway, the exhaust channel discharges high-temperature gas through the reserved slot 3. At the same time, the coolant flow channel can be switched to spray mode, spraying coolant through the reserved slot 3 to quickly reduce the temperature of the thermal runaway area.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A double-layer module structure, comprising a first cold plate (1) and a second cold plate (10), characterized in that: The inner sides of the first cold plate (1) and the second cold plate (10) are both arranged in a strip array with welding clamps (6). There are gaps between the welding clamps (6) at the top and bottom of the adjacent plates, and the gaps are equal. Each welding clamp (6) is equipped with a battery cell (7), and the battery cells (7) are arranged in a stacked manner.

2. The double-layer module structure according to claim 1, characterized in that: A connecting plate (2) is installed between the battery cell (7) installed on the first cold plate (1) and the battery cell (7) installed on the second cold plate (10).

3. The double-layer module structure according to claim 2, characterized in that: The interior of the connecting plate (2) is hollow. The front and back of the connecting plate (2) are provided with mounting areas (8). The front of the connecting plate (2) and the battery cells (7) on the second cold plate (10) are assembled. The back of the connecting plate (2) and the battery cells (7) on the first cold plate (1) are assembled.

4. A double-layer module structure according to claim 3, characterized in that: The front and back of the connecting plate (2) are both fitted with cooling heat dissipation plates (4), and the front and back of the cooling heat dissipation plates (4) are both fitted with heat absorption plates (5). The heat absorption plates (5) and the cooling heat dissipation plates (4) are integral.

5. A double-layer module structure according to claim 4, characterized in that: The top of each cooling heat dissipation plate (4) is provided with a reserved slot (3), and the reserved slot (3) is square in shape.

6. A double-layer module structure according to claim 5, characterized in that: Both ends of the inner side of the battery cell (7) are provided with heat-conducting ends (9), and the heat-conducting ends (9) are aligned with the heat-absorbing plate surface (5) and are in close contact with each other.

7. A double-layer module structure according to claim 6, characterized in that: The first cold plate (1), the battery cell (7), the connecting plate (2) and the second cold plate (10) constitute a complete sandwich structure module.

Images