A large capacity solid-state battery module structure

Abstract

The utility model discloses a kind of large-capacity solid-state battery module structures, the solid-state battery includes the solid-state battery cell and sheet-shaped tab of connection, further include battery shell, battery shell is equipped with sequentially arranged refrigerant cavity, inert gas heat exchange cavity and solid-state battery containing cavity, refrigerant cavity is separated by heat exchange plate between inert gas heat exchange cavity, solid-state battery is located in solid-state battery containing cavity;Inert gas heat exchange cavity and solid-state battery containing cavity are connected, and the inert gas internal circulation air duct is formed between the both and solid-state battery outer surface, inert gas internal circulation air duct is equipped with internal circulation pump, inert gas internal circulation air duct has horn shape structure.The large-capacity solid-state battery module structure provided by the utility model can prolong the life of large-capacity solid-state battery and improve its safety.

Description

Technical Field

[0001] This utility model relates to the field of high-capacity solid-state batteries, and in particular to a high-capacity solid-state battery module structure. Background Technology

[0002] Due to the specific application scenarios, marine power batteries require large-capacity and high-power cells to ensure sufficient range and full-power capability against wind and waves during navigation. Continuous high-power output generates heat, and controlling this heat is crucial for marine power batteries, especially regarding battery life and safety. Existing cells are aluminum-cased 280AH / 314AH cells, and when assembled into battery packs, they almost always use bottom cooling. Cooling from the bottom to the top of the cell takes a considerable amount of time, resulting in uneven temperature distribution across the cell, which is ineffective, shortens cell life, reduces safety, and exacerbates inconsistencies. Utility Model Content

[0003] The purpose of this invention is to provide a high-capacity solid-state battery module structure that can extend the lifespan of high-capacity solid-state batteries and improve their safety.

[0004] To achieve the above objectives, this utility model provides a high-capacity solid-state battery module structure. The solid-state battery includes a solid-state cell and sheet-shaped tabs connected together, and also includes a battery casing. The battery casing has a refrigerant chamber, an inert gas heat exchange chamber, and a solid-state battery housing chamber arranged sequentially inside. The refrigerant chamber and the inert gas heat exchange chamber are separated by a heat exchange plate. The solid-state battery is located inside the solid-state battery housing chamber. The inert gas heat exchange chamber and the solid-state battery housing chamber are connected, and together with the outer surface of the solid-state battery, they form an inert gas internal circulation duct. An internal circulation pump is provided inside the inert gas internal circulation duct.

[0005] As a further improvement of this utility model, the battery casing is provided with a refrigerant outlet and a refrigerant inlet, both of which are connected to the refrigerant chamber.

[0006] As a further improvement of this utility model, a first temperature sensor is provided in the inert gas heat exchange chamber, and a second temperature sensor is provided in the solid-state battery housing chamber. The first temperature sensor, the second temperature sensor, and the internal circulation pump are all electrically connected to the controller.

[0007] As a further improvement of this utility model, the inert gas internal circulation air duct includes an air supply port and an air return port. Both the air supply port and the air return port are disposed on a first partition located between the inert gas heat exchange chamber and the solid-state battery housing chamber. The outlet end of the air supply port is located on one side of the solid-state battery housing chamber and faces the outer surface of the solid-state battery cell. The air return port is close to the side where the sheet-like electrode of the solid-state battery is located.

[0008] As a further improvement of this utility model, the solid-state battery housing includes a housing body and a gas acceleration chamber. The solid-state battery is located inside the housing body. The gas inlet, housing body, gas acceleration chamber and gas return port are connected in sequence along the airflow direction. The cross-sectional dimension of the gas acceleration chamber gradually decreases along the airflow direction. The internal circulation pump is located at the gas return port.

[0009] As a further improvement of this utility model, the solid-state battery has at least two solid-state cells.

[0010] As a further improvement of this utility model, each of the solid-state battery cells is in the form of a sheet and is stacked in sequence; the sheet-shaped tabs of adjacent solid-state battery cells are electrically connected.

[0011] As a further improvement of this utility model, adjacent solid-state cells are separated by a partition strip, and the inner wall of the solid-state battery housing cavity is separated from the nearest solid-state cell by a partition strip; a gap is left between at least one edge of each solid-state cell and the inner wall of the solid-state battery housing cavity.

[0012] As a further improvement of this utility model, the two ends of the separator are respectively connected to the inner walls of the solid-state battery housing cavity arranged opposite to each other; the end of the separator is connected to a wind guide plate facing the side where the tab is located, and the free end of the wind guide plate is located outside the tab.

[0013] As a further improvement of this utility model, the adjacent separators are staggered along the length of the solid-state cells along the direction of their arrangement; the separators are also connected to a separator part by a connecting strip, and the separator part is located between adjacent solid-state cells.

[0014] Beneficial effects

[0015] Compared with existing technologies, the advantages of this utility model's large-capacity solid-state battery module structure are:

[0016] 1. An internal circulation pump drives inert gas to flow within the internal circulation duct, thereby removing heat from the solid-state battery's tabs. The inert gas exchanges heat with the refrigerant through a heat exchange plate, while the refrigerant exchanges heat through the external circulation. In this method, because the inert gas circulates internally and does not pass through the external circulation pipes, leaks are less likely, thus requiring a lower RP thread sealing rating for the external circulation pipes. Furthermore, the inert gas also protects the solid-state battery cells and acts as a fire extinguisher.

[0017] 2. This battery module structure ensures that the temperature rise of the ship's power battery will not exceed 1℃ when operating at a current of 500A, with the temperature difference between individual solid-state batteries within 0.2℃. When operating at a current of 1000A, the temperature rise is less than 1.2℃, with the temperature difference between individual solid-state batteries within 0.2℃. When operating at a current of 1500A, the temperature rise is 1.5℃, with the temperature difference between individual solid-state batteries within 0.2℃.

[0018] 3. A first temperature sensor is installed in the inert gas heat exchange chamber, and a second temperature sensor is installed in the solid-state battery housing chamber. The temperature difference between the two spaces is obtained by the temperature sensors. The controller starts or stops the internal circulation pump according to the temperature difference, which can keep the temperature difference within a low range, effectively prevent the solid-state battery cell and the tab plate from getting too hot, and ensure their normal operation.

[0019] 4. The cross-sectional dimensions of the gas acceleration chamber gradually decrease along the airflow direction. By utilizing the effect of narrowing flow, the flow velocity of the inert gas at this location increases, which is beneficial for removing the temperature of the tabs more quickly.

[0020] 5. When multiple solid-state cells are stacked, in order to ensure that the inert gas can remove the heat of the solid-state battery in time, adjacent solid-state cells can be separated by a separator. At the same time, a gap should be left between at least one edge of each solid-state cell and the inner wall of the solid-state battery cavity, so that the inert gas can contact almost all surfaces of the solid-state cells.

[0021] 6. The inert gas entering the solid-state battery cavity from the air inlet flows towards the tab on one side under the guidance of the separator and the air guide plate. Since the free end of the air guide plate is located on the outside of the tab, it ensures that the airflow on the surface of the tab and its two ends flows in the same direction, reducing turbulence caused by different local airflow directions, which is conducive to the rapid dissipation of heat from the tab.

[0022] 7. Along the direction of each solid-state cell arrangement, since the adjacent separators are staggered along the length of the solid-state cells, the inert gas entering the solid-state battery housing from the gas inlet can flow quickly to the surface of different solid-state cells under the guidance of the adjacent separators, reducing the occurrence of turbulence and reducing airflow resistance. Without increasing the power of the internal circulation pump, the flow rate of the inert gas can be accelerated, which is conducive to the rapid dissipation of heat from the tabs.

[0023] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front sectional view of the high-capacity solid-state battery module structure of Example 1;

[0026] Figure 2 for Figure 1 AA view;

[0027] Figure 3 This is a front sectional view of the high-capacity solid-state battery module structure in Example 2;

[0028] Figure 4 for Figure 3 BB view;

[0029] Figure 5 A three-dimensional view of the connection structure between the separator and the air guide plate;

[0030] Figure 6 A three-dimensional diagram showing the connection structure of the partition strip, air guide plate, and partition section;

[0031] Figure 7 A three-dimensional view of the connection structure between the separator strip and the separator section;

[0032] Figure 8 This is a 3D view showing the installation status of the separator, air guide plate, partition, and solid-state battery. Detailed Implementation

[0033] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0034] Example 1

[0035] The specific embodiments of this utility model are as follows: Figures 1 to 2As shown, a high-capacity solid-state battery module structure includes a solid-state battery cell 1 and sheet-shaped tabs 2 connected to each other, and a battery casing 3. The battery casing 3 contains a refrigerant chamber 34, an inert gas heat exchange chamber 32, and a solid-state battery housing chamber 31 arranged sequentially. The refrigerant chamber 34 and the inert gas heat exchange chamber 32 are separated by a heat exchange plate 33, which is fixedly connected to the inner wall of the battery casing 3. The solid-state battery is located within the solid-state battery housing chamber 31. The inert gas heat exchange chamber 32 and the solid-state battery housing chamber 31 are connected, and together with the outer surface of the solid-state battery, they form an inert gas internal circulation duct. An internal circulation pump 5 is installed within the inert gas internal circulation duct. Each solid-state battery has one sheet-shaped tab 2 (positive and one negative electrode), respectively located on both sides of the solid-state battery cell 1. The refrigerant in the refrigerant chamber 34 is a coolant.

[0036] The battery casing 3 is provided with a refrigerant outlet 35 and a refrigerant inlet 36, both of which are connected to the refrigerant chamber 34. Coolant is provided in the refrigerant chamber 34. The refrigerant outlet 35 and the refrigerant inlet 36 are connected to an external circulation heat exchange assembly 4 through pipes. The external circulation heat exchange assembly 4 includes an external circulation pump 41 and a heat exchange device 42, both of which are connected to the pipes.

[0037] A first temperature sensor 9 is installed in the inert gas heat exchange chamber 32, and a second temperature sensor 10 is installed in the solid-state battery housing chamber 31. The second temperature sensor 10 is located close to the tab 2. The first temperature sensor 9, the second temperature sensor 10, and the internal circulation pump 5 are all electrically connected to the controller.

[0038] The inert gas internal circulation duct includes an air supply port 37 and an air return port 38. Both the air supply port 37 and the air return port 38 are disposed on a first partition located between the inert gas heat exchange chamber 32 and the solid-state battery housing chamber 31. The edge of the first partition is fixedly connected to the battery casing 3. The outlet end of the air supply port 37 is located on one side of the solid-state battery housing chamber 31 and faces the outer surface of the solid-state cell 1. The air return port 38 is located near the side where the sheet-like electrode 2 of the solid-state battery is located. In this embodiment, there are multiple air supply ports 37 and at least two air return ports 38, which are respectively adjacent to the sheet-like electrode 2 at both ends of the solid-state battery. The internal circulation pump 5 is installed at each air return port 38.

[0039] The solid-state battery housing 31 includes a housing body 311 and a gas acceleration chamber 312. The solid-state battery is located inside the housing body 311. The gas inlet 37, housing body 311, gas acceleration chamber 312, and return gas inlet 38 are sequentially connected along the airflow direction. The gas acceleration chamber 312 has a trumpet-shaped structure, and its cross-sectional dimensions gradually decrease along the airflow direction. The internal circulation pump 5 is located at the return gas inlet 38. In this embodiment, a second partition 30 can be provided between the housing body 311 and the gas acceleration chamber 312. The second partition 30 is fixedly connected to the battery casing 3, and the second partition 30 has multiple through holes.

[0040] The solid-state battery comprises at least two solid-state cells 1, each solid-state cell 1 being sheet-shaped and stacked sequentially. The sheet-shaped tabs 2 of adjacent solid-state cells 1 are electrically connected. In this embodiment, there are 12 solid-state cells 1, which are connected in series by contacting each other via sheet-shaped tabs 2 located on the same side. This series connection allows the battery to have a larger output current, enabling it to be used as a marine power battery. The series-connected solid-state cells constitute a battery assembly, with their positive and negative terminals extending out of the battery casing 3 via conductive structures (e.g., wires) for connecting to electrical equipment. The portion of the wire extending out of the battery casing 3 is sealed to prevent inert gas leakage.

[0041] In addition, each solid-state battery cell 1 can also be connected in parallel or in a series-parallel hybrid connection via sheet tabs 2.

[0042] Before use, the high-capacity solid-state battery module structure is filled with inert gas, such as nitrogen, in both the solid-state battery housing 31 and the inert gas heat exchange chamber 32 connected within the battery casing 3. During operation, the inert gas draws heat from the solid-state battery through internal circulation and transports it to the inert gas heat exchange chamber 32. Then, it exchanges heat with the refrigerant located in the refrigerant chamber 34 through the heat exchange plate 33. After heat exchange, the inert gas re-enters the solid-state battery housing 31 to cool the solid-state battery. The refrigerant exchanges heat with the heat exchange device 42 through external circulation, ensuring that the refrigerant in the refrigerant chamber 34 is always at a low temperature.

[0043] During this process, the temperature of the inert gas in the inert gas heat exchange chamber 32 is monitored by the first temperature sensor 9, and the temperature of the inert gas in the solid-state battery housing 31 is monitored by the second temperature sensor 10. When the temperature T2 monitored by the second temperature sensor 10 is higher than the temperature T1 monitored by the first temperature sensor 9 by a set value T0 (e.g., 1°C), the controller starts the internal circulation pump 5, which drives the inert gas in both the solid-state battery housing 31 and the inert gas heat exchange chamber 32 to circulate internally.

[0044] Inside the inert gas heat exchange chamber 32, the inert gas, after heat exchange with the heat exchange plate 33, enters the inert gas heat exchange chamber 32 through the air inlet 37 and is blown onto the outer surface of the solid-state battery cell 1. Then it flows through the sheet tabs 2 of the solid-state battery, carrying away the heat from the sheet tabs 2, and then flows back to the inert gas heat exchange chamber 32 through the air return port 38. As the inert gas flows through the sheet tabs 2 and towards the air return port 38, the inert gas is accelerated by the gas acceleration chamber 312, whose cross-sectional size gradually decreases along the airflow direction.

[0045] In this solution, the heat of the solid-state battery, especially the heat of the tab 2, is quickly removed through the inert gas internal circulation duct, which can significantly extend the battery's lifespan.

[0046]

[0047] Example 2

[0048] like Figures 3 to 8 As shown, the difference from Embodiment 1 is that adjacent solid-state cells 1 are separated by partition strips 6, and the inner wall of the solid-state battery housing 31 is separated from the nearest solid-state cell 1. A gap 11 is left between the two side edges of each solid-state cell 1 and the inner wall of the solid-state battery housing 31. Therefore, in this embodiment, the solid-state cell 1 has a larger surface area that can contact the inert gas, resulting in better cooling.

[0049] In this embodiment, there are 12 solid-state battery cells 1, which are stacked sequentially from bottom to top and connected in series via tabs 2. Two longitudinally arranged partitions 6 are provided between adjacent solid-state battery cells 1, and the partitions 6 are perpendicular to the length direction of the solid-state battery cell 1. The two ends of the partitions 6 are respectively connected to two opposing inner walls of the solid-state battery housing 31.

[0050] The separator 6 is connected to a guide plate 7 facing the side where the tab 2 is located. The free end of the guide plate 7 is located on the outside of the tab 2. The separator 6 and the guide plate 7 together form a guide structure. The guide structure allows the inert gas entering the solid-state battery cavity 31 to be first diverted to the surface of each solid-state cell 1. Then, when the inert gas flows through the tab 2 of the solid-state battery, the flow direction of the inert gas is basically consistent with the extension direction of the tab 2, which helps to reduce turbulence.

[0051] Along the direction in which the solid-state cells 1 are arranged, the vertically adjacent separators 6 are staggered along the length of the solid-state cells 1, such as... Figure 3 As shown, the separators 6 of different layers are staggered from the end to the middle of the solid-state cell 1. In this embodiment, the two separators 6 above the top layer solid-state cell 1 are closest to the tabs 2 on the left and right sides of the solid-state cell 1; the two separators 6 above the bottom layer solid-state cell 1 are farthest from the tabs 2 on the left and right sides of the solid-state cell 1.

[0052] There are multiple air inlets 37 on the first partition, and their distribution range basically coincides with the vertical projection of a single solid-state battery cell 1.

[0053] The separator 6 can also be connected to a separator 8 via a connecting strip 81, with the separator 8 located between adjacent solid-state cells 1. The height of the connecting strip 81 is less than that of the separator 8, allowing inert gas to pass through the gap between the connecting strip 81 and the solid-state cell 1. For solid-state cells 1 located in the upper layers, since the distance between the two separators 6 in the same layer is relatively large, no additional separator 8 is required as an auxiliary support. However, for solid-state cells 1 located in the lower layers, since the distance between the two separators 6 in the same layer is relatively small, if they are supported only by the separators 6, the solid-state cells 1 are prone to shaking, so additional separator 8 is required. The bottommost solid-state cell 1 is supported by a longitudinally arranged separator 6 between itself and the bottom of the solid-state battery housing 31. Two separators 8 are provided on both the left and right sides of this separator 6 to support the solid-state cell 1, ensuring that the solid-state cell 1 is placed stably.

[0054] To further prevent the solid-state battery cell 1 from shaking, a groove 61 can be provided on the top edge of the separator 6. The bottom of the horizontally placed solid-state battery cell 1 can be embedded in the groove 61, and the longitudinal length of the groove 61 is adapted to the width of the solid-state battery cell 1.

[0055] When the inert gas in the inert gas heat exchange chamber 32 enters the housing body 311 through the air inlet 37, the inert gas flowing out from the outermost air inlet 37 is blown toward the upper surface of the uppermost solid-state cell 1, and then flows toward the free end of the tab 2 under the guidance of the separator 6, the air guide plate 7, and the tab 2, thereby carrying away the heat of the solid-state battery (especially the tab 2). When the inert gas flowing down from the air inlet 37 near the middle flows down, it flows through the gap 11 on both sides of the upper solid-state cell 1 and enters the gap between adjacent solid-state cells 1 in the lower layer. Under the guidance of the separator 6, the air guide plate 7, and the tab 2, it flows toward the free end of the tab 2, carrying away the heat.

[0056] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A high-capacity solid-state battery module structure, wherein the solid-state battery comprises a solid-state cell (1) and sheet-shaped tabs (2) connected to each other, characterized in that, It also includes a battery casing (3), which contains a refrigerant chamber (34), an inert gas heat exchange chamber (32), and a solid-state battery housing chamber (31) arranged in sequence. The refrigerant chamber (34) and the inert gas heat exchange chamber (32) are separated by a heat exchange plate (33). The solid-state battery is located in the solid-state battery housing chamber (31). The inert gas heat exchange chamber (32) and the solid-state battery housing chamber (31) are connected to each other. Together with the outer surface of the solid-state battery, they form an inert gas internal circulation duct. An internal circulation pump (5) is provided in the inert gas internal circulation duct.

2. The high-capacity solid-state battery module structure according to claim 1, characterized in that, The battery casing (3) is provided with a refrigerant outlet (35) and a refrigerant inlet (36) that are both connected to the refrigerant chamber (34).

3. The high-capacity solid-state battery module structure according to claim 1, characterized in that, The inert gas heat exchange chamber (32) is equipped with a first temperature sensor (9), and the solid-state battery housing chamber (31) is equipped with a second temperature sensor (10). The first temperature sensor (9), the second temperature sensor (10), and the internal circulation pump (5) are all electrically connected to the controller.

4. The high-capacity solid-state battery module structure according to claim 1, characterized in that, The inert gas internal circulation duct includes an air supply port (37) and an air return port (38). Both the air supply port (37) and the air return port (38) are located on the first partition between the inert gas heat exchange chamber (32) and the solid-state battery housing chamber (31). The outlet end of the air supply port (37) is located on one side of the solid-state battery housing chamber (31) and faces the outer surface of the solid-state battery cell (1). The air return port (38) is located near the side where the sheet-like tabs (2) of the solid-state battery are located.

5. The high-capacity solid-state battery module structure according to claim 4, characterized in that, The solid-state battery housing (31) includes a housing body (311) and a gas acceleration chamber (312). The solid-state battery is located inside the housing body (311). The gas inlet (37), housing body (311), gas acceleration chamber (312) and gas return port (38) are connected in sequence along the airflow direction. The cross-sectional dimensions of the gas acceleration chamber (312) gradually decrease along the airflow direction. The internal circulation pump (5) is located at the gas return port (38).

6. A high-capacity solid-state battery module structure according to any one of claims 1 to 5, characterized in that, The solid-state battery has at least two solid-state cells (1).

7. The high-capacity solid-state battery module structure according to claim 6, characterized in that, Each of the solid-state battery cells (1) is in the form of a sheet and is stacked in sequence; the sheet-shaped tabs (2) of adjacent solid-state battery cells (1) are electrically connected.

8. The high-capacity solid-state battery module structure according to claim 7, characterized in that, The adjacent solid-state cells (1) are separated by a partition strip (6), and the inner wall of the solid-state battery cavity (31) is separated from the nearest solid-state cell (1); a gap (11) is left between at least one edge of each solid-state cell (1) and the inner wall of the solid-state battery cavity (31).

9. A high-capacity solid-state battery module structure according to claim 8, characterized in that, The two ends of the separator (6) are respectively connected to the two opposite inner walls of the solid battery housing cavity (31); the end of the separator (6) is connected to a guide plate (7) facing the side where the tab (2) is located, and the free end of the guide plate (7) is located outside the tab (2).

10. A high-capacity solid-state battery module structure according to claim 9, characterized in that, Along the direction of the arrangement of each solid cell (1), the adjacent separators (6) are staggered along the length of the solid cell (1); the separators (6) are also connected to the separators (8) by the connecting strips (81), and the separators (8) are located between the adjacent solid cells (1).

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