Solid-state battery pack system

Abstract

The invention discloses a solid-state battery pack system, and relates to the technical field of battery thermal management. The system comprises a box body and at least one battery module arranged in the box body, the battery module comprises a plurality of battery cells arranged in the thickness direction, a liquid cooling plate arranged at the bottom of the battery module and a plurality of heating films arranged between every two adjacent battery cells. The area of the heating film is not smaller than the large area of the battery cell. The cell is thermally coupled to the liquid-cooled plate through a thermally conductive member including a side portion and a bottom portion. A module heating integrated plate is fixed on a cross beam of the battery pack, a plurality of conductive fixing structures are arranged on the module heating integrated plate, and heating film terminals are mounted on the conductive fixing structures; and the heating films are electrically connected with one another through conductive fixing structures. Through a mode of combining large-area heating of the heating film and dual heating of the liquid cooling plate, the temperature rise time of the solid-state battery pack system is remarkably shortened, and ordered arrangement and convenient maintenance of a heating loop are realized through the design of the integrated plate.

Description

Technical Field

[0001] This invention relates to the field of battery thermal management technology, and in particular to a solid-state battery pack system. Background Technology

[0002] Solid-state batteries possess excellent thermal stability and safety due to their solid electrolytes, and their operating temperature range is relatively wide. However, the ionic conductivity of solid electrolytes is low at low temperatures. To ensure optimal performance, solid-state batteries typically need to maintain their operating temperature within a specific high range. Existing battery preheating methods usually rely on bottom heating with liquid cooling plates or heating films or liquid cooling plates on the sides of the module. Due to the small heating area, long heat conduction path, and high internal thermal resistance of solid-state cells, these heating methods often result in slow heating rates and uneven temperature distribution, making it difficult to meet the requirement for solid-state batteries to quickly reach their optimal operating temperature.

[0003] Therefore, how to improve the heating rate of solid-state batteries and ensure heating uniformity, so as to maintain the temperature of solid-state batteries within the optimal temperature range of 40~90℃ and achieve their best performance, has become an urgent technical problem to be solved. Summary of the Invention

[0004] The main objective of this invention is to provide a solid-state battery pack system that aims to improve the heating rate of solid-state batteries and ensure heating uniformity, maintaining the temperature of solid-state batteries within the optimal temperature range of 40~90℃ to achieve their best performance.

[0005] To achieve the above objectives, the present invention proposes a solid-state battery pack system, including a housing and at least one battery module disposed within the housing; the battery module includes a plurality of battery cells arranged along the thickness direction, a liquid cooling plate disposed at the bottom of the battery module, and a plurality of heating films disposed between adjacent battery cells; the area of ​​the heating film is not less than the large surface area of ​​the battery cell; the battery cell is thermally coupled to the liquid cooling plate through a heat-conducting member, the heat-conducting member at least including a side portion that is in contact with the large surface area of ​​the battery cell and a bottom portion that is in contact with the liquid cooling plate; a module heating integrated plate is fixed on the crossbeam of the battery pack, the module heating integrated plate is provided with a plurality of conductive fixing structures, and the heating film terminals are mounted on the conductive fixing structures for positioning; each heating film terminal is electrically connected to the others through the conductive fixing structures.

[0006] Preferably, the heating film includes a heating film body, a wire, and a heating film terminal; the heating film terminal is connected to the heating film body via the wire.

[0007] Preferably, each heating film has two heating film terminals, namely a first heating film terminal and a second heating film terminal.

[0008] Preferably, the heat-conducting component is a C-shaped metal structure; the lower part of the C-shaped metal structure is in contact with the liquid cooling plate, and the side of the C-shaped metal structure is in contact with the large surface of the battery cell.

[0009] Preferably, the battery cell has a soft-pack packaging structure, and the thickness of the battery cell is within... between.

[0010] Preferably, the heating film wires and the heating film terminals are led out from one side of the cuboid structure formed by the battery cells arranged along the thickness direction.

[0011] Preferably, the module heating integrated plate is provided with a plurality of fixing parts that are isolated from each other by partitions, and the conductive fixing structure is disposed within the fixing parts.

[0012] Preferably, the module heating integrated plate is provided with module heating integrated plate fixing holes, and the module heating integrated plate is fixed to the crossbeam through the module heating integrated plate fixing holes; the conductive fixing structure is a heating film terminal fixing hole, and a threaded metal insert is provided in the heating film terminal fixing hole, and the heating film terminal is fixed to the metal insert by bolts.

[0013] Preferably, the conductive fixing structure is a heating film terminal fixing post disposed on the module heating integrated plate.

[0014] Preferably, the heating film body integrates a heating circuit, which includes a positive temperature coefficient thermistor material to achieve self-limiting heating through resistance adjustment, thereby maintaining the heated temperature of the battery cell at a certain level. between.

[0015] The above technical solution has the following advantages: This invention achieves direct heat transfer to the large surface area of ​​the battery cell by placing a heating film with an area no smaller than that of the large surface area of ​​the battery cell between two adjacent cells. This eliminates the thermal resistance caused by traditional lateral conduction and significantly improves heat exchange efficiency. Simultaneously, the bottom liquid cooling plate and heat-conducting components with sides and bottom form a multi-dimensional three-dimensional heating network, greatly shortening the time it takes for the solid-state battery pack system to reach its suitable operating temperature. Furthermore, by fixing a module heating integration plate with a conductive fixing structure on the battery pack crossbeam, the orderly positioning and electrical connection of numerous heating film terminals are achieved. This fully utilizes the Z-axis space of the battery pack while significantly improving production assembly efficiency and the convenience of subsequent maintenance. Attached Figure Description

[0016] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the heating film provided in an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of multiple heating films provided in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of a solid-state battery module structure unit provided in an embodiment of the present invention.

[0019] Figure 4 This is an exploded view of a solid-state battery module structure unit provided in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of a solid-state battery module provided in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the module heating integrated plate provided in an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the structure of the module heating integrated plate with fixed columns provided in an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of a solid-state battery pack provided in an embodiment of the present invention.

[0024] Figure 9 for Figure 8 A partially enlarged schematic diagram of the location of the heating integration plate in the middle module. Detailed Implementation

[0025] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Numerous specific details are set forth in the following description to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without these specific details. Technical features in the embodiments of this application can be combined with each other without conflict.

[0026] Example 1 like Figures 1 to 9 As shown, this embodiment provides a solid-state battery pack system. In the field of electric vehicles, solid-state batteries, due to their solid electrolyte material, possess advantages such as good thermal stability and high safety. Solid-state batteries have a wide operating temperature range, typically within... However, solid-state batteries exhibit lower ionic conductivity at low temperatures. To achieve optimal performance, their operating temperature typically needs to be maintained within a specific, relatively high range, such as an optimal temperature of [insert temperature range here]. Existing heating methods often rely on bottom heating with a liquid cooling plate or side heating of the module. Due to the long heat conduction path, small heating area, and high internal thermal resistance of the solid-state cell, the heating rate is slow and the temperature distribution is uneven. This embodiment improves the heating structure and electrical connection method to achieve rapid and uniform heating of the solid-state battery, maintaining the solid-state battery at its optimal performance range of 40~90℃.

[0027] The solid-state battery pack system mainly includes multiple battery cells 11 arranged along the thickness direction, a liquid cooling plate disposed at the bottom of the module, and multiple heating films 3 disposed between adjacent battery cells 11. The battery cells 11 adopt a pouch packaging structure, and their thickness is typically set according to actual energy density requirements. Between. This soft-pack structure makes the large surface area of ​​cell 11 relatively large, while the side surface area is small. The solid-state battery module is composed of end plate 83, binding strap 84, base 82, output electrode 81 and module structure unit in its overall structure.

[0028] The heating film 3 is arranged between two adjacent battery cells 11, meaning that the heating film 3 is in direct contact with the large surface area of ​​the battery cell 11. In this embodiment, the large surface area of ​​the heating film 3 is greater than or equal to the large surface area of ​​the battery cell 11, thereby ensuring that heat can cover most of the chemical reaction area of ​​the battery cell 11. Through this large-area heating method, heat can directly reach the interior of the battery cell 11 without going through a long lateral conduction process, resulting in a large heating area and significantly improving heat exchange efficiency.

[0029] To further optimize thermal management, cell 11 achieves thermal coupling with the liquid cooling plate through thermally conductive component 4. Specifically, thermally conductive component 4 is... A type of metal structure. The metal structure includes a side portion that is in contact with the large surface of the battery cell 11 and a bottom portion that is in contact with the liquid cooling plate. Specifically, the heat-conducting component 4 is... The lower part of the frame contacts the top surface of the liquid cooling plate, thereby transferring the heat or cooling capacity generated by the liquid cooling plate to the module. Simultaneously, its side surface is in contact with the large surface of the battery cell 11. In this structure, the battery cell 11 is not only heated by the large surface of the adjacent heating film 3, but also receives auxiliary heat exchange from the side surface and the large surface through the heat-conducting component 4. When the liquid cooling plate activates its heating mode, heat is conducted through the bottom of the heat-conducting component 4 to its side, and then acts on the large surface and side surface of the battery cell 11. When the heating film 3 and the liquid cooling plate work synchronously, a multi-dimensional three-dimensional heating network is formed, greatly shortening the time it takes for the solid-state battery pack system to reach its suitable operating temperature.

[0030] In terms of electrical connections and mechanical structure, a module heating integration plate 5 is fixed on the crossbeam 6 of the battery pack. The module heating integration plate 5 is positioned close to the crossbeam, serving as a converging and supporting component for the heating circuit, thus achieving orderly distribution of heating signals and fully utilizing the battery pack's... Towards space. The module heating integrated board 5 is provided with multiple conductive fixing structures 51. The heating film terminals 31 of the heating film 3 are positioned and electrically connected through these conductive fixing structures 51. The heating film 3 includes a heating film body 33, wires 32, and heating film terminals 31. The heating film terminals 31 are connected to the heating film body 33 via wires 32. To facilitate wiring and maintenance of the entire system, the wires 32 and heating film terminals 31 of the heating film 3 are uniformly led out from one side of the cuboid structure formed by the battery cells 11 arranged along the thickness direction.

[0031] In this embodiment, a dedicated heating circuit is integrated within the heating film body 33. This heating circuit includes a positive temperature coefficient thermistor material, i.e. Materials. Utilizing the self-limiting temperature characteristics of this material, the heating film 3 can automatically adjust its resistance according to the ambient temperature, thereby achieving adaptive adjustment of the heating power. This not only avoids damage to the solid-state battery cell caused by localized overheating, but also stably maintains the heated temperature of the battery cell 11 at a stable level. Within the optimal range.

[0032] When the battery pack system starts up in a low-temperature environment, the controller instructs the liquid cooling plate to introduce hot fluid and simultaneously energizes the heating film 3. Heat penetrates from all directions from the bottom, large surface, and gaps between adjacent cells 11. Compared to the traditional solution that relies solely on the base plate for heat transfer, this solution deeply embeds the heating source inside the module, eliminating heat conduction blind spots. Through the modular design of the module heating integration board 5, hundreds or even thousands of heating film terminals 31 are firmly and insulatedly fixed above the crossbeam 6, utilizing the redundant space inside the battery pack and providing convenience for later maintenance.

[0033] Example 2 This embodiment, based on Embodiment 1, further refines and improves the specific structure of the module heating integration board 5 and the heating film 3. To achieve efficient integration and convenient maintenance of the internal heating circuit of the battery pack, the module heating integration board 5 adopts a multi-station isolation structure design. Specifically, the module heating integration board 5 has multiple fixing parts isolated from each other by partitions 52, and the conductive fixing structure 51 is disposed within these fixing parts. The presence of the partitions 52 effectively physically isolates each heating film terminal 31 in space, thereby avoiding the risk of electrical short circuits caused by contact between adjacent terminals under vibration or collision conditions. It also provides a clear physical boundary for maintenance personnel to inspect individual heating circuits, facilitating subsequent inspection and replacement.

[0034] The heating film 3 is specifically constructed including a heating film body 33, wires 32, and heating film terminals 31. In a preferred embodiment, each heating film 3 has two symmetrically arranged heating film terminals 31, namely a first heating film terminal and a second heating film terminal. In this structure, the heating films of the entire module are connected in series. Although the number of heating film terminals 31 is relatively large, the maintenance cost is low. In another alternative, the heating films 3 can be connected in parallel or multiple heating film groups in series. In this case, the number of heating film terminals 31 in the entire module is reduced, but the maintenance cost is correspondingly increased. One end of the wire 32 is connected to the heating circuit inside the heating film body 33, and the other end extends to the lateral edge of the module and connects to the heating film terminal 31. All wires 32 and heating film terminals 31 are led out from one side of the cuboid structure formed by the arrangement of the cells 11. This facilitates centralized wiring at the central channel or crossbeam 6 of the battery pack, reducing the disorderly passage of high voltage and signal harnesses within the pack.

[0035] The module heating integrated plate 5 is fixed to the crossbeam 6 of the battery pack through module heating integrated plate fixing holes. This installation method cleverly utilizes the space inside the battery pack's crossbeam used for structural reinforcement, achieving a functional combination of mechanical support and electrical integration. In one embodiment, the conductive fixing structure 51 is specifically manifested as a heating film terminal fixing hole. A threaded metal insert is pre-embedded in this fixing hole. The heating film terminal 31 is screwed into this metal insert by bolts 7, i.e., terminal fixing bolts, thereby achieving a stable mechanical lock and reliable electrical contact. In another alternative embodiment, the conductive fixing structure 51 can also be a heating film terminal fixing post disposed on the module heating integrated plate 5. In this scheme, the heating film terminal 31 is fixed by being sleeved on the fixing post, which can further simplify the assembly process and reduce manufacturing difficulty.

[0036] Considering the physical characteristics of cell 11, the solid-state cell selected in this embodiment has a soft-pack packaging structure, and its thickness is within... Within the range. Due to the relatively weak rigidity of the pouch cell casing, the thermal conductive component 4... The metal structure not only serves as a heat conductor but also provides mechanical restraint and strength for the battery cells 11 in their arrangement direction. The side of the heat-conducting component 4 is attached to the large surface of the battery cell 11, and together with the clamping force of the heating film 3, the module maintains overall structural stability when subjected to external impacts. Furthermore, the heating film body 33 uses a self-regulating material to strictly control the temperature within a certain range. This temperature range perfectly covers the energy efficiency range where the ion migration efficiency of solid electrolytes is the highest, ensuring that the battery still has strong power output under extremely cold conditions.

[0037] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A solid-state battery pack system, characterized in that, The battery pack includes a housing and at least one battery module disposed within the housing. The battery module includes multiple battery cells arranged along its thickness, a liquid cooling plate disposed at the bottom of the battery module, and multiple heating films disposed between adjacent battery cells. The area of ​​each heating film is not less than the large surface area of ​​a battery cell. Each battery cell is thermally coupled to the liquid cooling plate via a heat-conducting component, the heat-conducting component including at least a side portion that contacts the large surface area of ​​the battery cell and a bottom portion that contacts the liquid cooling plate. A module heating integrated plate is fixed to the crossbeam of the battery pack. The module heating integrated plate has multiple conductive fixing structures, and the heating film terminals are mounted on the conductive fixing structures for positioning. Each heating film terminal is electrically connected to the others through the conductive fixing structures.

2. The solid-state battery pack system according to claim 1, characterized in that, The heating film includes a heating film body, wires, and heating film terminals; the heating film terminals are connected to the heating film body via the wires.

3. The solid-state battery pack system according to claim 2, characterized in that, Each heating film is provided with two heating film terminals, namely a first heating film terminal and a second heating film terminal.

4. The solid-state battery pack system according to claim 1, characterized in that, The heat-conducting component is a C-shaped metal structure; the lower part of the C-shaped metal structure is in contact with the liquid cooling plate, and the side of the C-shaped metal structure is in contact with the large surface of the battery cell.

5. The solid-state battery pack system according to claim 1, characterized in that, The battery cell has a soft-pack packaging structure, and the thickness of the battery cell is within... between.

6. The solid-state battery pack system according to claim 2, characterized in that, The heating film's wires and terminals extend from one side of the cuboid structure formed by the battery cells arranged along the thickness direction.

7. The solid-state battery pack system according to claim 1, characterized in that, The module heating integrated plate is provided with multiple fixing parts that are isolated from each other by partitions, and the conductive fixing structure is disposed in the fixing parts.

8. The solid-state battery pack system according to claim 7, characterized in that, The module heating integrated plate is provided with module heating integrated plate fixing holes, and the module heating integrated plate is fixed to the crossbeam through the module heating integrated plate fixing holes; the conductive fixing structure is a heating film terminal fixing hole, and a threaded metal insert is provided in the heating film terminal fixing hole, and the heating film terminal is fixed to the metal insert by bolts.

9. The solid-state battery pack system according to claim 1, characterized in that, The conductive fixing structure is a heating film terminal fixing post disposed on the module heating integrated plate.

10. The solid-state battery pack system according to claim 2, characterized in that, The heating film body integrates a heating circuit, which includes a positive temperature coefficient thermistor material to achieve self-limiting heating through resistance adjustment, thereby maintaining the heated temperature of the battery cell at a certain level. between.

Images