Shower type fire-fighting liquid cooling integrated battery pack and battery system

Abstract

This invention relates to the field of battery cooling technology and discloses a shower-type fire-fighting liquid-cooled integrated battery pack and battery system. The shower-type fire-fighting liquid-cooled integrated battery pack includes a battery pack assembly, a battery pack, and a liquid cooling module. The battery pack is disposed in the battery pack assembly, which has a liquid outlet. The liquid cooling module includes a distribution pipe and a liquid inlet, with a spray nozzle and an irrigation nozzle on the distribution pipe. In this solution, liquid is directly sprayed onto the battery surface for flow-based heat dissipation, solving the problems of long heat dissipation paths and poor heat dissipation effects of liquid cooling plate solutions. It also avoids the leakage risk caused by welding of liquid cooling plates, reducing weight and cost. The fire-fighting and cooling pipes are integrated into one unit. When spraying the sides of the battery cells, it plays a good role in heat exchange, reducing the possibility of thermal runaway and thermal diffusion. When irrigation is applied to the top of the battery cells, it can effectively suppress the spread of thermal runaway cells.

Description

Technical Field

[0001] This invention relates to the field of battery cooling technology, specifically to a shower-type fire-fighting liquid-cooled integrated battery pack and battery system. Background Technology

[0002] Traditionally, cooling systems for battery systems typically employ liquid cooling plates, which are costly to design and have poor cooling performance. In the event of thermal runaway, immersion liquid cooling is performed by opening valves, with the liquid slowly rising from the bottom. However, this method is slow and ineffective compared to the rapid response of the thermal runaway electrode, as illustrated in CN116960509A and CN117482442A. Furthermore, since cooling and fire suppression systems are installed separately, fire suppression systems require separate extinguishing materials and independent compressor and pump systems, further increasing battery costs. This application addresses these issues. Summary of the Invention

[0003] The purpose of this invention is to provide a shower-type fire-fighting liquid-cooled integrated battery pack and battery system. By directly spraying liquid onto the battery surface for heat dissipation, it solves the problems of long heat dissipation path, poor heat dissipation effect and high structural cost of liquid cooling plate solutions. Furthermore, it integrates cooling and fire protection into one unit, further reducing structural costs.

[0004] The present invention is achieved through the following technical solution.

[0005] This invention discloses a shower-type fire-fighting liquid-cooled integrated battery pack, which integrates fire protection and cooling pipes into one unit, significantly reducing product weight and cost compared to existing solutions. The pack includes a battery assembly, a battery pack, and a liquid-cooling module. The battery pack is housed within the battery assembly, which has a liquid outlet. The liquid-cooling module includes a distribution pipe and a liquid inlet. The distribution pipe has a spray nozzle and an irrigation nozzle. Coolant enters the distribution pipe through the inlet and is sprayed onto the side of the battery pack through the spray nozzle for cooling. Coolant is also sprayed onto the top of the battery pack through the irrigation nozzle, allowing it to pour onto the battery cells from above and prevent heat diffusion. The liquid-cooling module also includes a spray mode control component for controlling the opening of the spray nozzle and / or irrigation nozzle.

[0006] Furthermore, the spraying mode control component is also used to control the flow rate of the spray nozzles and / or irrigation inlets.

[0007] Furthermore, the spraying mode control component includes a control motor, the diversion pipe includes an inner diversion pipe and an outer diversion pipe, the spray nozzle and irrigation port are disposed on the inner diversion pipe, the outer diversion pipe is provided with a control hole, the control motor is used to control the rotation of the outer diversion pipe, and the spraying mode and spraying flow rate are adjusted by switching the position of the control hole and the spray nozzle and irrigation port.

[0008] Furthermore, the spraying mode control component includes an explosion-proof part that seals the irrigation port and opens the irrigation port after thermal runaway reaches a set level.

[0009] The explosion-proof section can be designed as a weak area, or it can be covered with an explosion-proof film or a preheat-activated film.

[0010] Furthermore, the spray nozzle is inclined downwards, and the irrigation port is inclined upwards.

[0011] Furthermore, the battery pack assembly includes a battery tray, on which a manifold and a battery support are provided. The manifold is positioned at a lower height than the battery support. The battery tray has an outlet connected to the manifold, and the battery support is used to support the battery pack.

[0012] Furthermore, the bottom of the manifold is inclined, with the lowest point being near the liquid outlet.

[0013] Furthermore, the liquid cooling module also includes a main flow pipe, and several groups of branch pipes are provided and all connected to the main flow pipe. The branch pipes are located in the gap between the battery packs so that the branch pipes can cool the battery packs on both sides.

[0014] A battery system includes a cabinet, a liquid inlet system, a liquid outlet system, and several sets of the above-mentioned shower-type fire-fighting liquid-cooled integrated battery packs. The liquid inlet system includes a liquid inlet manifold and a liquid inlet connecting pipe, the liquid inlet connecting pipe connecting the liquid inlet manifold and the liquid inlet. The liquid outlet system includes a liquid outlet manifold and a liquid outlet connecting pipe, the liquid outlet connecting pipe connecting the liquid outlet manifold and the liquid outlet.

[0015] Furthermore, both the inlet and outlet manifolds are equipped with valve bodies to accelerate the cooling rate and increase thermal runaway protection capabilities.

[0016] The beneficial effects of the present invention are as follows: In this solution, liquid is directly sprayed onto the battery surface for heat dissipation, which solves the problems of long heat dissipation path and poor heat dissipation effect of liquid cooling plate solution. It can effectively reduce battery temperature, has good temperature uniformity, and has a simple structure. By eliminating the liquid cooling plate and the thermal conductive adhesive or thermal pad that it is used with, the leakage risk caused by the welding of liquid cooling plate is avoided, which reduces weight and cost.

[0017] The fire suppression and cooling pipes are integrated into one unit, allowing for spraying to lower the temperature even when it is slightly high. During spraying, it effectively prevents heat conduction and isolates the spread of open flames. When spraying the sides of the battery cells, it provides excellent heat exchange, reducing the possibility of thermal runaway. When spraying the top of the battery cells, it effectively suppresses the spread of thermal runaway.

[0018] The addition of a motor-controlled diversion outer pipe allows for flexible control of the liquid volume and direction by rotating the outer pipe, solving the problems of existing spraying methods lacking specificity, heat dissipation, and fire-fighting effectiveness.

[0019] Add explosion-proof reserved holes so that the spray fire intensity will automatically increase when thermal runaway reaches a certain level, preventing fire from occurring. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the invention 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 the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of the shower-type fire-fighting liquid-cooled integrated battery pack of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the battery pack;

[0024] Figure 3 This is a schematic diagram of the battery tray structure;

[0025] Figure 4 This is a side cross-sectional view of the battery pack;

[0026] Figure 5 This is a schematic diagram of the liquid cooling piping structure;

[0027] Figure 6 This is a schematic diagram of the cross-section of the diversion pipe in Example 1;

[0028] Figure 7 for Figure 6 Schematic diagram of the various states of the central splitter pipe;

[0029] Figure 8 This is a schematic diagram of the overall structure of the battery system;

[0030] Figure 9 This is a schematic diagram of the cross-section of the diversion pipe in Example 2. Detailed Implementation

[0031] The following is combined with Figure 1-9 The present invention will be described in detail below.

[0032] Example 1:

[0033] The present invention provides a shower-type fire-fighting liquid-cooled integrated battery pack, such as... Figure 1It includes a battery pack assembly 100, a battery pack 300, and a liquid cooling module 200.

[0034] like Figure 1 , Figure 2 , Figure 3 The battery pack assembly 100 includes a battery tray 105 and a top cover. The battery tray 105 is provided with a manifold 102 and a battery support 103. The manifold 102 is positioned at a height lower than the battery support 103. The battery tray 105 is provided with an outlet 101 connected to the manifold 102. The battery support 103 is used to support the battery pack 300.

[0035] Preferably, the bottom of the manifold 102 is inclined, with the lowest point near the liquid outlet 101, forming a plane with a slight slope, so that the liquid can be effectively collected at the liquid outlet manifold 104.

[0036] The manifold 102 receives the remaining coolant and collects it into the outlet manifold 104, from which it flows out of the battery pack through the outlet 101.

[0037] like Figure 2 The battery pack 300 is located in the battery pack assembly 100. The battery pack 300 includes several rows of battery modules, and each row of battery modules includes several cells.

[0038] like Figure 2 , Figure 5 The liquid cooling module 200 includes a main flow pipe 202, a branch pipe 230, and an inlet 201. Both the inlet 201 and the outlet 101 extend to the outside of the battery pack. The inlet is fixed at a slightly higher position on the battery pack. Several sets of branch pipes 230 are provided, two sets in this embodiment, and both are connected to the main flow pipe 202. The main flow pipe 202 and the branch pipes 230 are connected to the battery pack assembly 100 by a clip 106, which supports the pipes at a certain height. The branch pipes 230 are located in the gap between the battery packs 300, so that the branch pipes 230 can cool and extinguish the fire of the battery packs 300 on both sides.

[0039] The shunt pipe 230 is provided with several sets of spray nozzles 234 and irrigation nozzles 233 along its extension direction. At least each battery cell corresponds to one spray nozzle 234 and one irrigation nozzle 233. Coolant enters the main pipe 202 and the shunt pipe 230 through the inlet 201. The coolant is sprayed out through the spray nozzles 234 to the side of the battery pack 300, ensuring that it can reach the side of the battery cell and flow along the side to the bottom manifold, thereby achieving a cooling effect. The coolant is sprayed out through the irrigation nozzles 233 to the top of the battery pack 300, allowing the coolant to pour onto the battery cell from above, preventing heat diffusion. In this embodiment, as shown... Figure 5The spray nozzles 234 and irrigation nozzles 233 on the diversion pipe 230 are symmetrically arranged, with the spray nozzles 234 tilted downwards and the irrigation nozzles 233 tilted upwards, thereby achieving cooling and irrigation effects respectively. In addition, it should be noted that the arrangement of the spray nozzles 234 and irrigation nozzles 233 is not limited to the above method, and any arrangement that can achieve the above effects is acceptable.

[0040] Coolant serves to cool or heat the system. It is insulated from the system and has good fluidity.

[0041] The liquid cooling module 200 also includes a spraying mode control component, which is used to control the opening of the spray nozzle 234 and / or the irrigation nozzle 233 and the flow rate.

[0042] Specifically, such as Figure 6 The spraying mode control component includes a control motor 204. The diversion pipe 230 includes an inner diversion pipe 231 and an outer diversion pipe 232. The outer diversion pipe 232 is sleeved on the outside of the inner diversion pipe 231. The inner diversion pipe 231 is fixedly installed. The control motor 204 is used to control the rotation of the outer diversion pipe 232. The spray nozzle 234 and the irrigation nozzle 233 are installed on the inner diversion pipe 231. The outer diversion pipe 232 is provided with control holes 235. In this embodiment, two sets of control holes 235 are provided on one cross section. Other numbers can also be provided as needed.

[0043] A control motor 204 can control the status of a row of spray nozzles 234 and irrigation nozzles 233, and the structure is simple and effective.

[0044] The spraying mode and spraying flow rate are adjusted by controlling the motor 204 to switch the relative positions of the control hole 235 with the spray nozzle 234 and irrigation nozzle 233. Figure 7 The document lists six spraying modes: A: Lower two spray holes half open; B: Lower two spray holes fully open; C: Upper left irrigation hole open; D: Upper two irrigation holes open; E: Upper right irrigation hole open; F: Spray holes and irrigation holes fully closed.

[0045] Those skilled in the art will understand that the spray holes, irrigation holes, and control holes are opened on one or both sides of the diversion pipe, and the size and number of the holes are determined by actual needs.

[0046] The inner shunt tube is fixed and cannot rotate, while the outer shunt tube's rotation is controlled by a motor at one end. For example... Figure 7This diagram illustrates the different cooling and fire suppression modes achieved by rotating the external shunt pipe clockwise. When the lithium battery temperature is between 40°C and 50°C, the spray holes on both sides below are partially open; when the lithium battery temperature is between 50°C and 60°C, the spray holes on both sides below are fully open. Alternatively, one side can be adjusted to open as needed. When the lithium battery temperature reaches 70°C to 80°C, it is preliminarily determined that thermal runaway has occurred. One or both irrigation holes on the upper side are opened to provide irrigation-style cooling to the heated cells and prevent the spread of sprayed material, thus serving a fire suppression control function. When thermal runaway occurs at a certain point in the battery pack, the spray holes and irrigation holes of other shunt pipes can be temporarily closed. This passively increases the liquid supply to the pipe at the point of thermal runaway, achieving effective prevention and control.

[0047] Temperature parameters are obtained from several temperature monitoring points (which may be temperature sensors) set in the battery pack. The temperature monitoring points, control motor 204 and control module are connected to achieve coordinated control.

[0048] Optionally, it is also possible to determine the specific location of thermal runaway by temperature monitoring points, and adjust the height and distance of coolant spray by adjusting pressure and opening size. Adjacent split pipes can also cooperate with each other.

[0049] Example 2: The difference from Example 1 is that in this example, the spraying mode control component includes an explosion-proof part 238, such as... Figure 9 The diversion pipe 230 is a single pipe body. The explosion-proof part 238 seals the irrigation port 233. After thermal runaway reaches the set level, the explosion-proof part 238 is damaged or deformed, causing the irrigation port 233 to open, increasing the intensity of spraying fire and preventing fire from occurring.

[0050] The explosion-proof section 238 is sealed before the explosion. Specifically, it can be designed as a weak area, or an explosion-proof film or a preheated and automatically destroyed film can be applied to ensure that it is sealed under normal circumstances. When a higher level of thermal runaway occurs, the thermal runaway area is sprayed by increasing the liquid pressure or preheating and melting the film.

[0051] Optionally, the reserved blasting holes are not limited to being set at the irrigation inlet 233, but can be set at other locations, either on one or both sides of the diversion pipe. The size and number of holes are determined by actual needs.

[0052] The method in this embodiment achieves the effect of automatically increasing the intensity of fire suppression spraying to prevent fires when the battery experiences thermal runaway.

[0053] A battery system, such as Figure 8It includes a cabinet 700, a liquid inlet system, a liquid outlet system, and several sets of shower-type fire-fighting liquid-cooled integrated battery packs as described in Embodiment 1 or 2 above. The liquid inlet system includes a liquid inlet manifold 503 and a liquid inlet connecting pipe 501. The liquid inlet connecting pipe 501 connects the liquid inlet manifold 503 and the liquid inlet 201. The liquid outlet system includes a liquid outlet manifold 601 and a liquid outlet connecting pipe 603. The liquid outlet connecting pipe 603 connects the liquid outlet manifold 601 and the liquid outlet 101.

[0054] The outlet manifold 601 and the inlet manifold 503 are respectively provided with an outlet manifold outlet 602 and an inlet manifold inlet 502, which, together with the coolant circulation device, realize the circulation supply of coolant.

[0055] Preferably, each inlet manifold 501 and outlet manifold 603 is equipped with a valve body for more refined independent PACK control. The addition of a valve body to the inlet manifold 501 allows for independent pressurization of the pipeline within this PACK in the event of thermal runaway, enabling the release of more liquid more quickly. The addition of a valve body to the outlet manifold 603 reduces the outflow rate, increasing the amount of coolant within the PACK, accelerating cooling, and enhancing thermal runaway protection capabilities.

[0056] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A shower fire-fighting liquid-cooled integrated battery pack, characterized by: The system includes a battery pack assembly (100), a battery pack (300), and a liquid cooling module (200). The battery pack (300) is disposed within the battery pack assembly (100). The battery pack assembly (100) has a liquid outlet (101). The liquid cooling module (200) includes a distribution pipe (230) and a liquid inlet (201). The distribution pipe (230) has a spray nozzle (234) and an irrigation inlet (233). Coolant enters the distribution pipe (230) through the liquid inlet (201) and is sprayed out to the battery pack (300) through the spray nozzle (234). The side of the liquid cooling module (200) is used to achieve a cooling effect. The coolant is sprayed out through the irrigation port (233) to the top of the battery pack (300), so that the coolant is poured into the battery cell from above to prevent heat diffusion. The liquid cooling module (200) also includes a spray mode control component, which is used to control the opening of the spray port (234) and / or irrigation port (233); the spray mode control component is also used to control the flow rate of the spray port (234) and / or irrigation port (233); the spray mode control component includes a control motor (204), the shunt pipe ( 230) includes an inner branch pipe (231) and an outer branch pipe (232). The spray nozzle (234) and irrigation nozzle (233) are provided on the inner branch pipe (231). The outer branch pipe (232) is provided with a control hole (235). The control motor (204) is used to control the rotation of the outer branch pipe (232). The spraying mode and spraying flow rate are adjusted by switching the position of the control hole (235) and the spray nozzle (234) and irrigation nozzle (233). The spraying mode control component includes an explosion-proof part (238). The irrigation port (233) is closed. After thermal runaway reaches the set level, the explosion-proof part (238) opens the irrigation port (233). The spray port (234) is inclined downward and the irrigation port (233) is inclined upward. The liquid cooling module (200) also includes a main pipe (202). Several sets of branch pipes (230) are provided and are all connected to the main pipe (202). The branch pipes (230) are set in the gap between the battery packs (300) so that the branch pipes (230) can cool the battery packs (300) on both sides.

2. The shower-type fire-fighting liquid-cooled integrated battery pack according to claim 1, characterized in that: The battery pack assembly (100) includes a battery tray (105), on which a manifold (102) and a battery support (103) are provided. The manifold (102) is positioned at a height lower than that of the battery support (103). The battery tray (105) is provided with an outlet (101) connected to the manifold (102). The battery support (103) is used to support the battery pack (300).

3. The shower-type fire-fighting liquid-cooled integrated battery pack according to claim 2, characterized in that: The bottom of the manifold (102) is inclined, with the lowest point being near the outlet (101).

4. A battery system, characterized in that: The system includes a cabinet (700), a liquid inlet system, a liquid outlet system, and several sets of shower-type fire-fighting liquid-cooled integrated battery packs as described in any one of claims 1-3. The liquid inlet system includes a liquid inlet manifold (503) and a liquid inlet connecting pipe (501), wherein the liquid inlet connecting pipe (501) connects the liquid inlet manifold (503) and the liquid inlet (201). The liquid outlet system includes a liquid outlet manifold (601) and a liquid outlet connecting pipe (603), wherein the liquid outlet connecting pipe (603) connects the liquid outlet manifold (601) and the liquid outlet (101).

5. The battery system according to claim 4, characterized in that: Both the inlet manifold (501) and the outlet manifold (603) are equipped with valve bodies.

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