Liquid cooling plate for thermal runaway of battery and battery

Abstract

The utility model discloses a liquid cooling plate for battery thermal runaway and a battery, the liquid cooling plate is internally provided with a liquid cooling flow channel, the liquid cooling flow channel comprises a first flow channel and a second flow channel, and the liquid cooling plate is also provided with a through pressure relief hole; according to the scheme, the first flow channel is specially used for cooling the pole columns of the plurality of battery monomers, so that the risk of thermal runaway of the battery monomers is reduced; according to the scheme, the second flow channel corresponds to the anti-explosion valves of the plurality of single batteries, and when the single batteries are subjected to serious thermal runaway, the liquid cooling plate can be broken through, so that the cooling liquid in the second flow channel is poured outwards and poured onto the single batteries subjected to thermal runaway, the spreading of the thermal runaway is avoided, and meanwhile, the anti-explosion valves of the single batteries are prevented from being damaged. The pressure relief holes formed in the liquid cooling plate ensure that the explosion-proof valve can exhaust air outwards in time on one hand, further reduce the risk of thermal runaway spreading on the other hand, reduce the structural strength of the liquid cooling plate on the other hand, and facilitate the battery single bodies with thermal runaway to break through the corresponding second flow channels.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a liquid cooling plate and battery for battery thermal runaway. Background Technology

[0002] Liquid cooling plates, as commonly used functional components in batteries, serve to cool individual battery cells. However, when the operating temperature of a battery cell exceeds the safety threshold, thermal runaway will occur. Thermal runaway in one battery cell is usually accompanied by a chain reaction of thermal runaway in other battery cells. Liquid cooling plates, which only cool individual battery cells, cannot meet the requirement of suppressing thermal propagation. Therefore, how to reduce the risk of thermal runaway and how to effectively suppress thermal runaway when it occurs are current technical challenges for batteries with high safety requirements. Utility Model Content

[0003] The purpose of this invention is to provide a liquid cooling plate and battery for battery thermal runaway, mainly to solve the technical problems of how to reduce the risk of battery thermal runaway and how to effectively suppress the thermal runaway phenomenon when the battery thermal runaway occurs.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A liquid cooling plate for battery thermal runaway is disposed on one side of the terminals and explosion-proof valves of multiple battery cells. The liquid cooling plate has liquid cooling channels, including at least one first channel and at least one second channel. The first channel is directed to face the terminals of the multiple battery cells, and the second channel is directed to face the explosion-proof valves of the multiple battery cells. The liquid cooling plate has at least one through-hole pressure relief hole at a position that avoids the first channel and the second channel, respectively.

[0006] In one of the technical solutions, the second flow channel is provided with pressure relief holes on both opposite sides in the width direction.

[0007] In one of the technical solutions, the liquid cooling channel includes at least one liquid cooling region, and the liquid cooling region includes two first channels and a second channel located between the two first channels;

[0008] Within one of the liquid cooling regions, a row of pressure relief holes is provided between each of the two first flow channels and the second flow channel.

[0009] In one of the technical solutions, the liquid cooling channel includes a main liquid inlet channel, a main liquid outlet channel, and at least two liquid cooling branch channels;

[0010] Each of the liquid cooling branches is connected to the liquid inlet main line and the liquid outlet main line respectively, and each liquid cooling branch includes at least one of the liquid cooling areas;

[0011] When the liquid cooling branch includes multiple liquid cooling regions, the multiple liquid cooling regions in the liquid cooling branch are connected in series.

[0012] In one of the technical solutions, among the multiple liquid cooling branches, the liquid cooling branch that is farther away from the liquid inlet end of the main liquid inlet has a larger flow space with the main liquid inlet.

[0013] In one of the technical solutions, the liquid cooling plate has pressure relief holes in the corresponding areas on both sides of the explosion-proof valves of the multiple battery cells.

[0014] In one of the technical solutions, at least one isolation strip is connected inside the pressure relief hole to isolate the pressure relief hole into multiple holes.

[0015] In one of the technical solutions, the liquid cooling plate includes a flow channel plate and a flat plate;

[0016] The flow channel plate is formed by stamping to form the liquid cooling flow channel. The plate is welded to the flow channel plate and seals the liquid cooling flow channel. The plate is provided with an inlet hole and an outlet hole that respectively penetrate into the liquid cooling flow channel.

[0017] The flow channel plate is provided with at least one through first hole, and the plate is provided with at least one through second hole at a position that at least partially overlaps with the first hole. The first hole and the second hole together constitute the pressure relief hole.

[0018] In one technical solution, the sum of the thicknesses of the flow channel plate and the flat plate is 1mm-2mm, the flow channel plate is stamped to form the liquid cooling flow channel, and the stamping depth of the flow channel plate is 3mm-4mm.

[0019] This application also provides a battery, including a plurality of battery cells and a liquid cooling plate as described above. The battery cell includes a terminal as a positive or negative electrode and an explosion-proof valve. The explosion-proof valve and at least one of the terminal are disposed on the top of the battery cell. The liquid cooling plate is disposed on the top of the plurality of battery cells. A first flow channel is directly opposite the terminal on the top of the plurality of battery cells, and a second flow channel is directly opposite the explosion-proof valve of the plurality of battery cells.

[0020] Compared with the prior art, the liquid cooling plate for battery thermal runaway provided by this utility model has at least the following beneficial effects:

[0021] This design incorporates a first and second flow channel in its liquid cooling plate. The first flow channel is specifically designed to cool the terminals of multiple battery cells, reducing the risk of thermal runaway and ensuring the cells operate within a suitable temperature range, thus extending their lifespan. The second flow channel is positioned opposite the explosion-proof valves of multiple battery cells. In the event of severe thermal runaway, the coolant can rupture through the liquid cooling plate, causing the coolant in the second flow channel to spill out and onto the affected battery cell, thereby inhibiting the spread of thermal runaway and improving battery safety. Simultaneously, pressure relief holes on the liquid cooling plate ensure timely venting from the explosion-proof valves, further reducing the risk of thermal runaway propagation. Furthermore, the reduced structural strength of the liquid cooling plate facilitates the rupture of the corresponding second flow channel by a battery cell experiencing thermal runaway. Attached Figure Description

[0022] 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.

[0023] Figure 1 and Figure 2 All of these are schematic plan views of a liquid cooling plate for battery thermal runaway provided in the embodiments of this application;

[0024] Figure 3 An exploded view of the structure of a liquid cooling plate for battery thermal runaway provided in an embodiment of this application;

[0025] Figure 4 This is an exploded view of the structure of a battery provided in an embodiment of this application;

[0026] Figure 5 for Figure 4 A magnified view of a section at point C.

[0027] The following are the labeling elements in the figure:

[0028] 2. Liquid cooling plate; 21. Flow channel plate; 211. First hole; 22. Flat plate; 221. Liquid inlet hole; 222. Liquid outlet hole; 223. Second hole; 23. Liquid cooling flow channel; 231. First flow channel; 232. Second flow channel; 233. Main liquid inlet channel; 234. Main liquid outlet channel; 235. Liquid cooling branch channel; 24. Pressure relief hole; 25. Liquid cooling area; 26. Separator strip; 3. Battery cell; 31. Terminal post; 32. Explosion-proof valve. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] Please refer to the following: Figures 1 to 3 This embodiment provides a liquid cooling plate for battery thermal runaway. The liquid cooling plate includes a flow channel plate 21 and a flat plate 22. Both the flow channel plate 21 and the flat plate 22 are preferably made of 3-series or 6-series aluminum alloy. The sum of the thicknesses of the flow channel plate 21 and the flat plate 22 is preferably 1mm-2mm. The flow channel plate 21 is stamped to form a liquid cooling flow channel 23. The stamping depth of the flow channel plate 21 is 3mm-4mm. The flat plate 22 and the flow channel plate 21 are welded and sealed to the liquid cooling flow channel 23, so that the liquid cooling flow channel 23 can operate according to... Figure 1 The path indicated by the thick arrow is for coolant flow. The plate 22 is provided with a through inlet hole 221 and an outlet hole 222. After the plate 22 and the flow channel plate 21 are welded together, the inlet hole 221 and the outlet hole 222 will be connected to the liquid cooling flow channel 23 respectively. The inlet hole 221 is used to allow external coolant to enter into the liquid cooling flow channel 23, and the outlet hole 222 is used to allow the coolant in the liquid cooling flow channel 23 to be discharged outward.

[0035] Specifically, such as Figure 1 As shown, the liquid cooling channel 23 includes at least one first channel 231 and at least one second channel 232. The first channel 231 is used to simultaneously cool the terminals of multiple battery cells. Since the terminals are conductive metal components, their temperature is typically higher than the outer wall of the cell. The first channel 231 can efficiently cool multiple battery cells simultaneously. The outer wall of the liquid cooling plate at the first channel 231 can directly contact the terminals of the multiple battery cells, or it can indirectly conduct heat through a thermal pad or thermal adhesive. The second channel 232 is used to connect to the explosion-proof valves of the multiple battery cells. Furthermore, the liquid cooling plate has at least one through-hole pressure relief hole 24 at locations that avoid the first and second channels 231 and 232, respectively. In fact, as... Figure 3 As shown, the flow channel plate 21 is provided with at least one through first hole 211, and the plate 22 is provided with at least one through second hole 223 at a position that at least partially overlaps with the first hole 211. The first hole 211 and the second hole 223 together constitute the aforementioned pressure relief hole 24.

[0036] Specifically, the first flow channel 231 of the liquid cooling plate in this design is specifically used to cool the terminals of multiple battery cells. Cooling the terminals reduces the risk of thermal runaway in the battery cells, ensuring they operate within a suitable temperature range and extending their lifespan. The second flow channel 232 of the liquid cooling plate is directly opposite the explosion-proof valves of the multiple battery cells. In the event of severe thermal runaway, the coolant can break through the liquid cooling plate, causing the coolant in the second flow channel 232 to spill out and onto the battery cell experiencing thermal runaway, thus inhibiting the spread of thermal runaway and improving battery safety. Simultaneously, the pressure relief holes 24 on the liquid cooling plate ensure timely venting from the explosion-proof valves, further reducing the risk of thermal runaway propagation. They also reduce the structural strength of the liquid cooling plate, making it easier for a battery cell experiencing thermal runaway to break through its corresponding second flow channel 232.

[0037] Please refer to it again. Figure 1The second flow channel 232 has pressure relief holes 24 on both opposite sides in the width direction. This design allows the liquid cooling plate 2 to have pressure relief holes 24 on both sides of the explosion-proof valves of multiple battery cells, facilitating timely gas discharge from the explosion-proof valves and preventing excessive gas pressure from causing thermal runaway. It also reduces the structural strength of the liquid cooling plate in the area surrounding the second flow channel 232, thereby improving its reliability in breaking through the second flow channel 232 in the event of severe thermal runaway. In other embodiments, a weak section can be provided on the outer wall of the liquid cooling plate facing the battery cell and corresponding to the second flow channel 232. This weak section breaks under stress during thermal runaway, allowing the coolant in the second flow channel 232 to more easily flow downwards onto the corresponding explosion-proof valve, thus suppressing further spread of thermal runaway.

[0038] Optionally, such as Figure 1 As shown, when the length of the pressure relief hole 24 is too long and the structural strength of the liquid cooling plate is too low, at least one isolation strip 26 can be connected inside the pressure relief hole 24 to isolate the pressure relief hole 24 into multiple holes.

[0039] Please refer to them again. Figure 1 and Figure 2 The liquid cooling plate has at least one liquid cooling region 25, which includes two first flow channels 231 and a second flow channel 232 located between the two first flow channels 231. This design allows the liquid cooling plate to be used in… Figure 5 The diagram shows the heat dissipation requirements of a row of battery cells. Specifically, each liquid cooling zone 25 corresponds to one row of battery cells. Figure 5 The two terminals and the explosion-proof valve of each battery cell are located on the same side, and the explosion-proof valve is located between the two terminals of each battery cell. In addition, in each liquid-cooled zone 25, a row of pressure relief holes 24 as described above is provided between the two first flow channels 231 and the second flow channel 232, so as to achieve the purpose of providing pressure relief holes 24 on both sides of the second flow channel 232 in the width direction.

[0040] Please refer to them again. Figure 1 and Figure 2 The liquid cooling channel 23 specifically includes a main inlet channel 233, a main outlet channel 234, and at least two liquid cooling branch channels 235. All liquid cooling branch channels 235 are connected to both the main inlet channel 233 and the main outlet channel 234. The main inlet channel 233 is used to distribute coolant to each liquid cooling branch channel 235, and the main outlet channel 234 is used to allow the coolant from each liquid cooling branch channel 235 to converge and discharge outwards. By setting multiple parallel liquid cooling branch channels 235, the uniformity of cooling for multiple battery cells can be improved, that is, the temperature uniformity of multiple battery cells can be improved. In this embodiment, the liquid cooling branch channels 235 are preferably as follows: Figure 2 The diagram shows two lines. For example... Figure 2 As shown, the liquid cooling branch 235 includes at least one of the aforementioned liquid cooling regions 25, and when the liquid cooling branch 235 includes multiple liquid cooling regions 25, the multiple liquid cooling regions 25 within the liquid cooling branch 235 are connected in series. In this preferred embodiment, the liquid cooling branch 235 includes two of the aforementioned liquid cooling regions 25, that is, one liquid cooling branch 235 simultaneously cools two rows of battery cells.

[0041] Optionally, among the multiple liquid cooling branch lines 235, the liquid cooling branch line 235 further away from the liquid inlet end of the main liquid inlet line 233 and the main liquid inlet line 233 have a larger flow space. (See reference here.) Figure 2 And understand it as, in Figure 2 The space for coolant to flow from point B into the corresponding liquid cooling branch 235 is larger than the space for coolant to flow from point A into the corresponding liquid cooling branch 235. This makes the flow difference between the liquid cooling branches 235 smaller, thereby further improving the temperature uniformity of multiple battery cells after cooling and avoiding the possibility of thermal runaway caused by local battery cell temperatures remaining high.

[0042] Please refer to the following: Figure 4 and Figure 5 This embodiment also provides a battery comprising multiple battery cells 3 and the aforementioned liquid cooling plate 2. Each battery cell 3 includes a terminal post 31 serving as either a positive or negative electrode and an explosion-proof valve 32. The explosion-proof valve 32 and at least one terminal post 31 are disposed on the same side of the battery cell 3. The liquid cooling plate 2 is disposed on one side of the terminal posts 31 and the explosion-proof valve 32 of the multiple battery cells 3. The liquid cooling plate 2 can directly contact the terminal posts 31 of the multiple battery cells 3, and can also exchange heat with the battery cells 3 through a thermally conductive pad or thermally conductive adhesive. Specifically, the first flow channel 231 of the liquid cooling plate 2 faces the terminal posts 31 of the multiple battery cells 3, and the second flow channel 232 of the liquid cooling plate 2 faces the explosion-proof valve 32 of the multiple battery cells 3. By employing the aforementioned liquid cooling plate 2, the risk of thermal runaway in the battery can be reduced, and the risk of thermal runaway propagation can also be reduced when thermal runaway occurs, thus enhancing the battery's safety. Preferably, the two terminals 31 on the battery cell 3 are arranged on the same side, with one terminal 31 serving as the positive electrode and the other terminal 31 serving as the negative electrode, so that the liquid cooling plate 2 can simultaneously cool and reduce the temperature of both terminals 31 on the battery cell 3, thereby improving the heat dissipation efficiency of the battery cell 3.

[0043] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A liquid cold plate for battery thermal runaway, characterized by, The liquid cooling plate (2) is disposed on one side of the terminals and explosion-proof valves of multiple battery cells. The liquid cooling plate (2) has a liquid cooling channel (23). The liquid cooling channel (23) includes at least one first channel (231) and at least one second channel (232). The first channel (231) is used to correspond to the terminals of multiple battery cells, and the second channel (232) is used to correspond to the explosion-proof valves of multiple battery cells. The liquid cooling plate (2) is provided with at least one through pressure relief hole (24) at a position that avoids the first channel (231) and the second channel (232) respectively.

2. The liquid cold plate for battery thermal runaway of claim 1, wherein, The second flow channel (232) has pressure relief holes (24) on both sides opposite to each other in the width direction.

3. The liquid cold plate for battery thermal runaway of claim 2, wherein, The liquid cooling channel (23) includes at least one liquid cooling region (25), the liquid cooling region (25) includes two first channels (231) and a second channel (232) located between the two first channels (231). Within one of the liquid cooling zones (25), the pressure relief holes (24) are provided between the two first flow channels (231) and the second flow channel (232).

4. The liquid cold plate for battery thermal runaway of claim 3, wherein, The liquid cooling channel (23) includes a main liquid inlet channel (233), a main liquid outlet channel (234), and at least two liquid cooling branch channels (235). Each of the liquid cooling branches (235) is connected to the liquid inlet main line (233) and the liquid outlet main line (234), and each liquid cooling branch (235) includes at least one of the liquid cooling regions (25). When the liquid cooling branch (235) includes multiple liquid cooling regions (25), the multiple liquid cooling regions (25) in the liquid cooling branch (235) are connected in series.

5. The liquid cold plate for battery thermal runaway of claim 4, wherein, Among the multiple liquid cooling branches (235), the liquid cooling branch (235) and the liquid inlet main line (233) that are farther away from the liquid inlet end of the liquid inlet main line (233) have a larger flow space.

6. The liquid cold plate for battery thermal runaway of claim 1, wherein, The liquid cooling plate (2) has pressure relief holes (24) on both sides of the explosion-proof valves of the multiple battery cells.

7. The liquid cold plate for battery thermal runaway of claim 1, wherein, At least one isolation strip (26) is connected inside the pressure relief hole (24) to isolate the pressure relief hole (24) into multiple holes.

8. The liquid cold plate for battery thermal runaway of claim 1, wherein, The liquid cooling plate (2) includes a flow channel plate (21) and a flat plate (22); The flow channel plate (21) is formed by stamping to form the liquid cooling flow channel (23). The plate (22) is welded to the flow channel plate (21) and seals the liquid cooling flow channel (23). The plate (22) is provided with an inlet hole (221) and an outlet hole (222) that respectively penetrate into the liquid cooling flow channel (23). The flow channel plate (21) is provided with at least one through first hole (211), and the plate (22) is provided with a through second hole (223) at a position that at least partially overlaps with the first hole (211). The first hole (211) and the second hole (223) together constitute the pressure relief hole (24).

9. The liquid cold plate for battery thermal runaway of claim 8, wherein, The sum of the thicknesses of the flow channel plate (21) and the flat plate (22) is 1mm-2mm, and the stamping depth of the flow channel plate (21) is 3mm-4mm.

10. A battery, characterized by The device includes multiple battery cells (3) and a liquid cooling plate (2) as described in any one of claims 1 to 9. Each battery cell (3) includes a terminal post (31) serving as a positive or negative electrode and an explosion-proof valve (32). The explosion-proof valve (32) and at least one of the terminal posts (31) are disposed on the same side of the battery cell (3). The first flow channel (231) in the liquid cooling plate (2) corresponds to the terminal post of the multiple battery cells (3), and the second flow channel (232) corresponds to the explosion-proof valve (32) of the multiple battery cells (3).

Images