Battery system

Abstract

The utility model discloses a battery system. The battery system comprises a box body, a battery cell module and a liquid cooling plate, a mounting cavity and an exhaust channel are arranged in the box body, and one end of the exhaust channel is communicated with the outside. And the battery cell module is arranged in the mounting cavity. The liquid cooling plate is arranged on the side face of the battery cell module, a liquid cooling flow channel is formed in the liquid cooling plate, an exhaust hole is formed in the liquid cooling plate, the exhaust hole penetrates through the liquid cooling plate in the thickness direction of the liquid cooling plate, the exhaust hole is communicated with the mounting cavity, and the exhaust hole is communicated with the other end of the exhaust channel. A flow guide groove is formed in the side surface, facing the battery cell module, of the liquid cooling plate, is formed in the length direction of the liquid cooling plate, and is communicated with the exhaust hole. And the thermal runaway gas enters the exhaust hole through the diversion trench, enters the exhaust channel of the box body through the exhaust hole, and is finally exhausted out of the battery system. According to the battery system, the influence of hot gas on surrounding normal battery cells is effectively reduced, and directional discharge of thermal runaway gas is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery system. Background Art

[0002] When a battery system experiences thermal runaway, it releases large amounts of high-temperature, high-pressure gas. If the gas cannot be discharged in a timely and targeted manner, it can easily cause heat spread within the battery module, sudden pressure increases, and even lead to system failure or safety accidents.

[0003] In related technologies, a separate exhaust channel is designed in the box. However, due to the lack of coordinated design of the exhaust structure and the liquid cooling plate, the gas ejected from the battery cells during thermal runaway is difficult to be effectively guided to the exhaust channel. The exhaust channel of the box does not have a dedicated flow guide structure for the gas flow path, resulting in disordered diffusion of gas inside the box. Some gas may directly impact the surrounding normal battery cells, triggering a chain reaction of thermal runaway and reducing the safety of the battery system. Utility Model Content

[0004] The main purpose of the present utility model is to provide a battery system, which aims to solve the technical problem that the exhaust channel of the box body is not equipped with a special guide structure for the gas flow path, resulting in the gas not needing to diffuse inside the box body, causing chain thermal runaway and reducing the safety of the battery system.

[0005] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a battery system.

[0006] A battery system comprising:

[0007] A box body, wherein a mounting cavity and an exhaust passage are provided in the box body, and one end of the exhaust passage is used to communicate with the outside;

[0008] A battery cell module, the battery cell module is arranged in the installation cavity;

[0009] a liquid cooling plate, the liquid cooling plate being arranged on a side of the battery cell module, the liquid cooling channel being arranged in the liquid cooling plate, and the liquid cooling plate being provided with an exhaust hole, the exhaust hole being arranged through the thickness direction of the liquid cooling plate, the exhaust hole being in communication with the mounting cavity, and the exhaust hole being in communication with the other end of the exhaust channel;

[0010] A guide groove is provided on the side of the liquid cooling plate facing the battery cell module. The guide groove is arranged along the length direction of the liquid cooling plate, and the guide groove is communicated with the exhaust hole.

[0011] In one embodiment, the guide groove is provided in plurality, and the exhaust hole is provided in plurality;

[0012] Along the length direction of the liquid cooling plate, the plurality of guide grooves and the plurality of exhaust holes are alternately arranged.

[0013] In one embodiment, along the width direction of the liquid cooling plate, the width of the guide groove is smaller than the width of the exhaust hole; and / or

[0014] The depth of the guide groove is less than the thickness of the liquid cooling plate.

[0015] In one embodiment, the liquid cooling channel is provided in plurality, and the exhaust hole is provided in plurality;

[0016] Along the width direction of the liquid cooling plate, the plurality of liquid cooling channels and the plurality of exhaust holes are arranged alternately.

[0017] In one embodiment, the battery system includes an exhaust assembly, which is arranged at the exhaust hole. When the air pressure in the installation cavity is lower than a threshold value, the exhaust assembly can seal the exhaust hole. When the air pressure in the installation cavity is higher than a threshold value, the exhaust assembly can be flushed open by the gas in the installation cavity so that the exhaust assembly forms an exhaust port.

[0018] In one embodiment, the exhaust hole is provided between the two guide grooves, one end of the exhaust component is connected to the groove wall of one of the guide grooves, and the other end of the exhaust component is connected to the groove wall of the other guide groove;

[0019] The exhaust assembly is provided with a guide channel along the length direction of the liquid cooling plate, and the guide channel is communicated with the guide groove.

[0020] In one embodiment, the cross-section of the exhaust assembly is U-shaped.

[0021] In one embodiment, the exhaust assembly includes an inner film layer, a middle layer and an outer film layer, and the inner film layer, the middle layer and the outer film layer are stacked, the inner film layer is arranged close to the battery cell module relative to the outer film layer, and the middle layer is arranged between the inner film layer and the outer film layer.

[0022] In one embodiment, a fracture groove is formed on the side of the outer film layer facing away from the middle layer, and the depth of the fracture groove is less than the thickness of the outer film layer.

[0023] In one embodiment, the middle layer is a thermal insulation layer.

[0024] Beneficial effects:

[0025] The battery system of the present invention includes a case, a battery cell module and a liquid cooling plate. An installation cavity and an exhaust channel are provided in the case, and one end of the exhaust channel is used to connect to the outside. The battery cell module is arranged in the installation cavity. The liquid cooling plate is arranged on the side of the battery cell module, and a liquid cooling flow channel is provided in the liquid cooling plate, and an exhaust hole is provided on the liquid cooling plate. The exhaust hole is provided along the thickness direction of the liquid cooling plate, the exhaust hole is connected to the installation cavity, and the exhaust hole is connected to the other end of the exhaust channel. A guide groove is provided on the side of the liquid cooling plate facing the battery cell module, the guide groove is provided along the length direction of the liquid cooling plate, and the guide groove is connected to the exhaust hole. During operation, the guide groove provided on the side of the liquid cooling plate facing the battery cell module can directly guide the gas ejected during thermal runaway of the battery cell module to flow along the guide groove. The thermal runaway gas enters the exhaust hole through the guide groove, and enters the exhaust channel of the case through the exhaust hole, and is finally discharged to the outside of the battery system. The emission path is clear and controllable, avoiding the disorderly spread of gas in the installation cavity, effectively reducing the impact of hot gas on surrounding normal battery cells, and realizing the directional emission of thermal runaway gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of a battery system according to an embodiment of the present invention.

[0027] Figure 2 It is a top view of a battery system according to an embodiment of the present invention.

[0028] Figure 3 yes Figure 2 Cross-sectional view in the AA direction.

[0029] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0030] Figure 5 It is a structural schematic diagram of a liquid cooling plate according to an embodiment of the present invention.

[0031] Figure 6 This is a top view of a liquid cooling plate according to an embodiment of the present invention.

[0032] Figure 7 yes Figure 6 Cross-sectional view in CC direction.

[0033] Figure 8 It is a structural schematic diagram of the guide groove and the exhaust hole in one embodiment of the utility model.

[0034] Figure 9 yes Figure 8 Cross-sectional view in the DD direction.

[0035] Figure 10 It is a structural schematic diagram of the exhaust state of the exhaust component of one embodiment of the present utility model.

[0036] Figure 11 yes Figure 9 Enlarged view of point E in the middle.

[0037] in:

[0038] 100, box body; 110, installation cavity;

[0039] 200, battery cell module;

[0040] 300, liquid cooling plate; 310, liquid cooling channel; 320, exhaust hole; 330, guide groove;

[0041] 400, exhaust assembly; 410, inner film layer; 420, middle layer; 430, outer film layer; 431, broken groove; 440, diversion channel.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0045] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] like Figures 1 to 7 As shown, in some embodiments, a battery system includes a case 100, a battery cell module 200 and a liquid cooling plate 300. An installation cavity 110 and an exhaust channel are provided in the case 100, and one end of the exhaust channel is used to connect to the outside. The battery cell module 200 is arranged in the installation cavity 110. The liquid cooling plate 300 is arranged on the side of the battery cell module 200, and a liquid cooling channel 310 is provided in the liquid cooling plate 300, and an exhaust hole 320 is provided in the liquid cooling plate 300. The exhaust hole 320 is provided through the thickness direction of the liquid cooling plate 300. The exhaust hole 320 is connected to the installation cavity 110, and the exhaust hole 320 is connected to the other end of the exhaust channel. A guide groove 330 is provided on the side of the liquid cooling plate 300 facing the battery cell module 200. The guide groove 330 is provided along the length direction of the liquid cooling plate 300, and the guide groove 330 is connected to the exhaust hole 320. As shown Figure 5 As shown, the X-axis direction is the length direction of the liquid cooling plate 300 , and the Y-axis direction is the thickness direction of the liquid cooling plate 300 .

[0048] During operation, the guide grooves 330 formed on the sides of the liquid cooling plate 300 facing the battery module 200 directly guide the gases emitted during thermal runaway of the battery module 200 along these grooves. The runaway gases enter the exhaust holes 320 through the guide grooves 330, and then enter the exhaust channel of the housing 100 through the exhaust holes 320, ultimately being discharged outside the battery system. This clear and controllable exhaust path prevents the disorderly spread of gases within the mounting cavity 110, effectively reducing the impact of hot gases on surrounding healthy cells and achieving targeted exhaust of the runaway gases.

[0049] Specifically, the housing 100 has a mounting cavity 110 disposed therein. The battery cell module 200 is mounted within the mounting cavity 110. The housing 100 provides physical protection for the battery cell module 200, isolating it from dust, moisture, and impurities from the external environment. It also prevents the internal battery cell module 200 and circuitry from direct contact with external objects, reducing the risk of short circuits and electrical leakage.

[0050] Specifically, multiple groups of battery cells are stacked and welded horizontally to form a battery module 200. Multiple battery modules 200 are arranged and connected in series to form a battery module assembly. The tabs of the stacked cells are connected sequentially through laser welding, ultrasonic welding, or other methods, forming an electrical path between the cells and mechanically securing them, thereby integrating the dispersed cells into a single battery module 200 with a specific voltage and capacity.

[0051] Specifically, the liquid cooling plate 300 is disposed on the side of the battery cell module 200. A liquid cooling channel 310 is provided within the liquid cooling plate 300. The liquid cooling channel 310 within the liquid cooling plate 300 exchanges heat with the battery cell module 200 through circulating coolant, directly removing heat generated during operation of the battery cell module 200. Because the liquid cooling plate 300 is in close contact with the side of the battery cell module 200, it can efficiently absorb heat from the battery cells through conduction, and then dissipate the heat through the flow of coolant within the liquid cooling channel 310, thereby achieving dynamic temperature control of the battery cell module 200 and avoiding the risk of thermal runaway due to local overheating.

[0052] Specifically, the liquid cooling plate 300 is provided with an exhaust hole 320. The exhaust hole 320 may be a waist-shaped hole.

[0053] Specifically, a plurality of exhaust holes 320 are provided. The plurality of exhaust holes 320 are equidistantly spaced along the length direction of the liquid cooling plate 300. The plurality of exhaust holes 320 are equidistantly spaced along the width direction of the liquid cooling plate 300. When thermal runaway occurs in the battery cell module 200, high-temperature gas is released evenly from the side of the battery cell. In the battery cell modules 200 stacked horizontally or arranged vertically, the gas diffusion range covers the entire side area of ​​the liquid cooling plate 300. The plurality of exhaust holes 320 are equidistantly distributed along the length and width directions, and can cover different areas of the battery cell module 200, ensuring that no matter where the gas erupts from in the battery cell module 200, it can be exhausted through the nearest exhaust hole 320 to avoid local gas accumulation. Figure 5 As shown, the Z-axis direction is the width direction of the liquid cooling plate 300 .

[0054] Specifically, the exhaust hole 320 is provided through the thickness direction of the liquid cooling plate 300. The exhaust hole 320 is connected to the installation cavity 110, and the exhaust hole 320 is connected to the other end of the exhaust channel. The exhaust hole 320 forms a through channel from the first side of the liquid cooling plate 300 toward the battery module 200 to the second side. When thermal runaway occurs in the battery module 200, the released high-temperature and high-pressure gas enters the installation cavity 110, and then converges to the entrance of the exhaust hole 320 through the guide groove 330 on the surface of the liquid cooling plate 300, and then flows to the other side of the liquid cooling plate 300 through the exhaust hole 320, and finally connects to the exhaust channel of the box body 100.

[0055] In some embodiments, a plurality of guide grooves 330 are provided. Along the length direction of the liquid cooling plate 300, a plurality of guide grooves 330 and a plurality of exhaust holes 320 are staggered. Such an arrangement enables each exhaust hole 320 to receive gas transported by a plurality of guide grooves 330. The plurality of guide grooves 330 cover the entire side of the liquid cooling plate 300 in contact with the battery cell module 200 along the length direction, and the staggered layout with the exhaust holes 320 can evenly cover different areas of the battery cell module 200. Compared with a single guide groove 330, the staggered arrangement allows the gas to be more comprehensively guided to the exhaust hole 320, avoiding gas leakage caused by the misalignment of the guide grooves 330 and the exhaust hole 320, ensuring that all thermal runaway gases can be directed into the exhaust path, thereby improving the exhaust efficiency of the battery system.

[0056] In some embodiments, the width of the guide groove 330 along the width of the liquid cooling plate 300 is smaller than the width of the exhaust hole 320. As the initial guide path for thermal runaway gases, the guide groove 330 utilizes the confining effect of the narrow channel to guide the dispersed gases emitted by the battery cell module 200 toward the exhaust hole 320, reducing diffusion losses during gas flow and ensuring directional gas convergence. The width of the exhaust hole 320 is greater than the width of the guide groove 330, providing more space for the converged gas to flow, reducing the flow resistance of the gas from the guide groove 330 to the exhaust hole 320, and ensuring smooth gas entry into the exhaust hole 320.

[0057] Specifically, the depth of the guide groove 330 is less than the thickness of the liquid cooling plate 300. In other words, the guide groove 330 does not penetrate the thickness of the liquid cooling plate 300. This allows the guide groove 330 to not only guide the gas but also ensure the strength of the liquid cooling plate 300 without affecting its load-bearing capacity and deformation resistance.

[0058] In some embodiments, multiple cooling channels 310 are provided, interlaced with exhaust holes 320 along the width of the cooling plate 300. This arrangement avoids spatial interference between the cooling channels 310 and the exhaust holes 320. Exhaust holes 320 are not provided in the area occupied by the cooling channels 310, and the exhaust holes 320 are located away from the cooling channels 310, ensuring that the cooling channels 310 and the exhaust holes 320 operate independently.

[0059] like Figures 8 to 11 As shown, in some embodiments, the battery system includes a vent assembly 400. The vent assembly 400 is disposed at the vent hole 320. When the air pressure within the mounting cavity 110 is less than a threshold, the vent assembly 400 can seal the vent hole 320. When the air pressure within the mounting cavity 110 is greater than the threshold, the vent assembly 400 can be flushed open by the gas within the mounting cavity 110, forming a vent.

[0060] It should be noted that when the battery cell module 200 is operating normally, the air pressure in the installation cavity 110 is less than the threshold value. When the battery cell module 200 experiences thermal runaway, the hot gas in the installation cavity 110 increases significantly, causing the air pressure in the installation cavity 110 to be greater than the threshold value. The exhaust assembly 400 is tightly fitted to the exhaust hole 320 under normal conditions to achieve sealing of the exhaust hole 320, preventing dust from entering or trace gas leakage during normal operation, ensuring that the heat dissipation function of the liquid cooling plate 300 is not affected, and maintaining the closedness of the installation cavity 110. When the battery cell module 200 experiences thermal runaway, the air pressure in the installation cavity 110 rises sharply and exceeds the threshold value, and the gas pressure in the installation cavity 110 rushes open the exhaust assembly 400, forming an exhaust port connecting the exhaust hole 320 and the exhaust channel, such as Figure 10 In the state shown, high-temperature and high-pressure gas is quickly discharged through the opening to achieve directional discharge.

[0061] Specifically, the exhaust hole 320 is disposed between two guide grooves 330. One end of the exhaust assembly 400 is connected to the wall of one guide groove 330, and the other end of the exhaust assembly 400 is connected to the wall of the other guide groove 330. The exhaust assembly 400 is provided with a guide channel 440 along the length of the liquid cooling plate 300. The guide channel 440 is connected to the guide groove 330.

[0062] Specifically, the cross section of the exhaust assembly 400 is U-shaped.

[0063] In some embodiments, the exhaust assembly 400 includes an inner film layer 410, a middle layer 420, and an outer film layer 430. The inner film layer 410, the middle layer 420, and the outer film layer 430 are stacked. The inner film layer 410 is positioned closer to the battery cell module 200 than the outer film layer 430, and the middle layer 420 is positioned between the inner film layer 410 and the outer film layer 430.

[0064] Specifically, the outer film layer 430 can be made of a mica-based material. The inner film layer 410 can be a low-temperature film, such as PC or PET. The middle layer 420 is a thermal insulation layer, such as an aerogel or phase change film. The inner film layer 410, middle layer 420, and outer film layer 430 are synthesized using high pressure.

[0065] like Figure 11 As shown, specifically, a groove 431 is formed on the side of the outer film layer 430 facing away from the middle layer 420, and the depth of the groove 431 is less than the thickness of the outer film layer 430. The groove 431 is pre-cut 90% in depth by laser to serve as a directional exhaust window.

[0066] It should be noted that when a large amount of exhaust occurs in an abnormal battery cell, the inner film layer 410 will quickly melt and impact the middle layer 420 and the outer film layer 430 through the outward explosion force, resulting in an exhaust port in the outer film layer 430, so that the gas can be effectively discharged. When the external gas impacts the exhaust component 400, due to the thermal insulation performance of the middle layer 420, it can effectively protect the structural integrity of the inner film layer 410 and maintain a certain supporting force. Therefore, the broken groove 431 of the outer film layer 430 does not break, and the whole maintains the function of isolating high-temperature gas, thereby protecting the normal battery cell. That is, if Figure 11 As shown, the fracture groove 431 is provided outside the outer film layer 430. When thermal runaway occurs, the generated gas impacts the inner film layer 410, the middle layer 420, and the outer film layer 430, causing the fracture groove 431 to fracture. In the absence of gas impact, the middle layer 420 can support the inner film layer 410 and the outer film layer 430, so that the fracture groove 431 will not fracture.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery system, characterized in that: include: A box body, wherein a mounting cavity and an exhaust passage are provided in the box body, and one end of the exhaust passage is used to communicate with the outside; A battery cell module, the battery cell module being disposed in the mounting cavity; a liquid cooling plate, the liquid cooling plate being arranged on a side of the battery cell module, the liquid cooling channel being arranged in the liquid cooling plate, and the liquid cooling plate being provided with an exhaust hole, the exhaust hole being arranged through the thickness direction of the liquid cooling plate, the exhaust hole being in communication with the mounting cavity, and the exhaust hole being in communication with the other end of the exhaust channel; A guide groove is provided on the side of the liquid cooling plate facing the battery cell module. The guide groove is arranged along the length direction of the liquid cooling plate, and the guide groove is communicated with the exhaust hole.

2. The battery system according to claim 1, wherein: There are multiple guide grooves and multiple exhaust holes. Along the length direction of the liquid cooling plate, the plurality of guide grooves and the plurality of exhaust holes are alternately arranged.

3. The battery system according to claim 1, wherein: Along the width direction of the liquid cooling plate, the width of the guide groove is smaller than the width of the exhaust hole; and / or The depth of the guide groove is less than the thickness of the liquid cooling plate.

4. The battery system according to claim 1, wherein: There are multiple liquid cooling channels and multiple exhaust holes. Along the width direction of the liquid cooling plate, the plurality of liquid cooling channels and the plurality of exhaust holes are arranged alternately.

5. The battery system according to claim 1, wherein: The battery system includes an exhaust assembly, which is arranged at the exhaust hole. When the air pressure in the installation cavity is lower than a threshold value, the exhaust assembly can seal the exhaust hole. When the air pressure in the installation cavity is higher than a threshold value, the exhaust assembly can be flushed open by the gas in the installation cavity so that the exhaust assembly forms an exhaust port.

6. The battery system according to claim 5, characterized in that The exhaust hole is provided between the two guide grooves, one end of the exhaust component is connected to the groove wall of one of the guide grooves, and the other end of the exhaust component is connected to the groove wall of the other guide groove; The exhaust assembly is provided with a guide channel along the length direction of the liquid cooling plate, and the guide channel is communicated with the guide groove.

7. The battery system according to claim 5, characterized in that The cross section of the exhaust assembly is U-shaped.

8. The battery system according to claim 5, characterized in that The exhaust component includes an inner film layer, a middle layer and an outer film layer. The inner film layer, the middle layer and the outer film layer are stacked. The inner film layer is arranged close to the battery cell module relative to the outer film layer, and the middle layer is arranged between the inner film layer and the outer film layer.

9. The battery system according to claim 8, characterized in that A broken groove is formed on the side of the outer film layer away from the middle layer, and the depth of the broken groove is less than the thickness of the outer film layer.

10. The battery system according to claim 8, characterized in that The middle layer is a thermal insulation layer.

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