Soft package battery structure and vehicle

Abstract

The utility model provides a soft package battery structure and a vehicle. The soft package battery structure comprises a plurality of battery modules, each battery module comprises a water cooling part and a plurality of battery cells, and tabs of the plurality of battery cells are connected to form a series battery cell group; the water cooling part comprises a water cooling plate and cooling fins, the cooling fins are arranged at the two ends of the water cooling plate, the water cooling plate and the cooling fins form a positioning frame and are used for positioning the series battery cell group, and the cooling fins located at the top of the series battery cell group are provided with a plurality of eruption holes; the water cooling pipeline is provided with a liquid inlet pipeline and a liquid return pipeline, a cooling liquid flow channel is arranged in the water cooling plate, and the liquid inlet end of the cooling liquid flow channel is connected to the liquid inlet pipeline; the liquid outlet end of the cooling liquid flow channel is connected to the liquid return pipeline. Through the arrangement, the heat exchange area can be increased, and the heat exchange efficiency is improved. When the battery cell is in thermal runaway, the thermal runaway battery cell can directionally exhaust air from the eruption holes, thermal diffusion caused by the fact that high temperature is transmitted to the adjacent battery cell due to disordered eruption is avoided, meanwhile, rapid cooling is achieved through the water cooling part, and the fire risk is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of thermal safety of soft package battery structure, and particularly relates to a soft package battery structure and a vehicle. BACKGROUND

[0002] In the related art, the heat dissipation effect of the soft package battery structure is general, and there is a risk of thermal runaway of the battery cell. When the battery cell is in thermal runaway, the exhaust position is not fixed, and the random emission of heat causes high temperature to be transferred to the adjacent battery cell, thereby causing thermal diffusion, and the risk of fire and explosion is high.

[0003] Therefore, it is necessary to provide a soft package battery structure and a vehicle to at least partially solve the problems in the prior art. SUMMARY

[0004] The present disclosure aims to at least solve one of the technical problems in the prior art or the related art.

[0005] To this end, the first aspect of the present disclosure provides a soft package battery structure;

[0006] The second aspect of the present disclosure provides a vehicle.

[0007] Therefore, according to the first aspect of the present disclosure, a soft package battery structure is provided, comprising:

[0008] a plurality of battery modules, each of the battery modules comprising a water cooling part and a plurality of battery cells, wherein the tabs of the plurality of battery cells are connected to form a series battery cell group; the water cooling part comprises a water cooling plate and a cooling fin, the water cooling plate is provided with a cooling liquid flow channel, the cooling fin is arranged around the periphery of the water cooling plate, the water cooling plate and the cooling fin form a positioning frame body for positioning the series battery cell group, the cooling fin at the top of the series battery cell group is provided with a plurality of emission holes, and the emission holes are used to exhaust in the case of thermal runaway of the battery cell through the emission holes;

[0009] a water cooling pipeline for providing cooling liquid to the plurality of battery modules, wherein the water cooling pipeline comprises an inlet pipeline and a return pipeline, and the inlet end of the cooling liquid flow channel is connected to the inlet pipeline; and the outlet end of the cooling liquid flow channel is connected to the return pipeline.

[0010] In a feasible implementation, the emission hole is located in the middle of the top end of the battery cell.

[0011] In a feasible implementation, the cooling fin is protrudingly arranged relative to the water cooling plate towards the battery cell.

[0012] In a feasible implementation, the protrusion size of the cooling fin relative to the battery cell is 1mm to 1.5mm.

[0013] In an embodiment, the cooling fins are made of aluminum.

[0014] In an embodiment, the series connection battery cell group is adhered to the water cooling part by thermal conductive adhesive.

[0015] In an embodiment, the soft package battery structure further comprises:

[0016] A buffer part is arranged at the end of the series connection battery cell group away from the water cooling part, and the buffer part is used to absorb the expansion of the battery cell.

[0017] In an embodiment, the soft package battery structure further comprises:

[0018] A first valve body is arranged at the inlet of the liquid inlet pipe;

[0019] A second valve body is arranged at the outlet of the liquid return pipe.

[0020] According to an embodiment of the second aspect of the present disclosure, a vehicle is provided, comprising:

[0021] The soft package battery structure as claimed in any one of the above technical solutions;

[0022] A cooling system, and the water cooling pipe is connected to the cooling system.

[0023] Compared with the prior art, the present disclosure at least includes the following beneficial effects: the soft package battery structure provided by the embodiments of the present disclosure is provided with a plurality of battery modules and a water cooling pipeline, and each battery module is provided with a water cooling part and a plurality of battery cells. Among them, the plurality of battery modules are connected in series in the water cooling pipeline, and the water cooling pipeline provides cooling liquid for the plurality of battery modules. Specifically, the tabs of the plurality of battery cells are connected to form a series battery cell group. The water cooling part is provided with a water cooling plate and a cooling fin, the cooling fin is arranged around the side of the water cooling plate, and the water cooling plate and the cooling fin form a positioning frame body to position the series battery cell group, and the cooling fin at the top of the series battery cell group is provided with a plurality of spray holes. The water cooling pipeline provides cooling liquid for the plurality of battery modules, wherein the water cooling pipeline is provided with a liquid inlet pipeline and a liquid return pipeline, the water cooling plate is provided with a cooling liquid flow channel, and the liquid inlet end of the cooling liquid flow channel is connected to the liquid inlet pipeline; the liquid outlet end of the cooling liquid flow channel is connected to the liquid return pipeline. In this way, the cooling system of the vehicle sends low-temperature cooling liquid to the cooling liquid flow channel through the liquid inlet pipeline to exchange heat with the battery cells, so as to quickly cool the battery cells. The cooling liquid in the cooling liquid flow channel is returned to the cooling system through the liquid return pipeline after heat exchange to maintain the continuous cooling of the battery cells. When the battery cell is in thermal runaway, the thermal runaway battery cell can be exhausted from the spray hole to determine the spray position, realize directional exhaust, avoid unordered spray to cause high temperature to be transmitted to the adjacent battery cell to cause thermal diffusion, and at the same time, the water cooling part quickly cools the thermal runaway battery cell to reduce the risk of fire and explosion and improve safety. BRIEF DESCRIPTION OF DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the exemplary embodiments. The drawings are for purposes of illustration only and are not intended to limit the present disclosure. The same reference symbols are used throughout the drawings and the following detailed description to refer to the same or like parts. In the drawings:

[0025] Figure 1 a schematic structural view of a soft package battery structure of an embodiment provided by the present disclosure;

[0026] Figure 2 a schematic front cross-sectional view of a battery module of an embodiment provided by the present disclosure;

[0027] Figure 3 a schematic side cross-sectional view of a battery module of an embodiment provided by the present disclosure;

[0028] Figure 4 a partial structural schematic view of the battery module shown in Figure 2

[0029] wherein, Figures 1 to 4 the correspondence between the reference signs and the component names in the drawings is as follows:

[0030] ​100 Soft-pack battery structure, 110 Battery module, 111 Water cooling section, 1111 Water cooling plate, 1112 Cooling fins, 1113 Ejector hole, 112 Battery cell, 113 Tab, 120 Water cooling pipe, 130 First valve body, 140 Second valve body. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are merely for describing exemplary embodiments of the invention. However, the invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0032] like Figures 1 to 4 As shown, according to an embodiment of the first aspect of this disclosure, a soft-pack battery structure 100 is provided, comprising: a plurality of battery modules 110, each of the battery modules 110 including a water-cooling section 111 and a plurality of battery cells 112, wherein the tabs 113 of the plurality of battery cells 112 are connected to form a series cell group; the water-cooling section 111 includes a water-cooling plate 1111 and cooling fins 1112, the water-cooling plate 1111 having a coolant flow channel, the cooling fins 1112 surrounding the periphery of the water-cooling plate 1111, the water-cooling plate 1111 and the cooling fins 1112 forming a positioning frame for... The aforementioned series-connected battery cell assembly is positioned such that the cooling fins 1112 at the top of the assembly are provided with multiple ejector holes 1113. These ejector holes 1113 are used to vent air in the event of thermal runaway of the battery cell 112. A water-cooling pipe 120 is used to supply coolant to the multiple battery modules 110. The water-cooling pipe 120 is provided with an inlet pipe and a return pipe. A coolant flow channel is provided inside the water-cooling plate 1111. The inlet end of the coolant flow channel is connected to the inlet pipe, and the outlet end is connected to the return pipe.

[0033] It can be understood that the soft package battery structure provided by the embodiments of the present disclosure is provided with a plurality of battery modules 110 and a water cooling pipeline 120, and each battery module 110 is provided with a water cooling part 111 and a plurality of battery cells 112. Among them, the plurality of battery modules 110 are connected in series to the water cooling pipeline 120, and the water cooling pipeline 120 provides cooling liquid for the plurality of battery modules 110. Specifically, the tabs 113 of the plurality of battery cells 112 are connected to form a series battery cell group. The water cooling part 111 is provided with a water cooling plate 1111 and a cooling fin 1112, the cooling fin 1112 is arranged around the side of the water cooling plate 1111, and the water cooling plate 1111 and the cooling fin 1112 form a positioning frame to position the series battery cell group, and the cooling fin 1112 at the top of the series battery cell group is provided with a plurality of spouting holes 1113. The water cooling pipeline 120 provides cooling liquid for the plurality of battery modules 110, wherein the water cooling pipeline 120 is provided with an inlet pipeline and a return pipeline, the water cooling plate 1111 is provided with a cooling liquid flow channel, and the inlet end of the cooling liquid flow channel is connected to the inlet pipeline; the outlet end of the cooling liquid flow channel is connected to the return pipeline. In this way, the cooling system of the vehicle sends low-temperature cooling liquid to the cooling liquid flow channel through the inlet pipeline to exchange heat with the battery cells 112, so as to quickly cool the battery cells 112. The cooling liquid in the cooling liquid flow channel is returned to the cooling system through the return pipeline after heat exchange to maintain the continuous cooling of the battery cells 112. When the battery cells 112 are in thermal runaway, the thermal runaway battery cells 112 can be exhausted from the spouting holes 1113 to determine the spouting position, realize directional exhaust, avoid unordered spouting to cause high temperature to be transmitted to the adjacent battery cells 112 to cause thermal diffusion, and at the same time, the water cooling part 111 quickly cools the thermal runaway battery cells 112 to reduce the risk of fire and explosion and improve safety.

[0034] Exemplarily, the adjacent battery modules 110 can be arranged in the same direction to correspond to the water cooling plate 1111 on both sides of each battery cell 112, so as to improve the heat exchange efficiency of the battery cells 112 and improve the cooling effect.

[0035] Exemplarily, as shown in Figure 1 , 15 battery modules 110 are arranged to form a square array soft package battery structure 100. Each battery module 110 can be provided with two series-connected battery cells 112.

[0036] Exemplarily, the soft package battery structure 100 can also be provided with a plurality of temperature detection members to detect the temperature of each battery cell 112 in the series battery cell group in real time, so as to adjust the temperature and flow of the cooling liquid supplied by the water cooling pipeline 120 according to the temperature data, and ensure the cooling effect of the battery cells 112.

[0037] It can be understood that the water cooling part 111 can be provided with a water cooling plate 1111 and a cooling fin 1112. Among them, the water cooling plate 1111 is provided with a cooling liquid flow channel, and the inlet end of the water cooling plate 1111 is connected to the liquid inlet pipeline, and the outlet end of the water cooling plate 1111 is connected to the liquid return pipeline. According to Figure 1 It is shown that the plurality of battery modules 110 are all provided with one side of the water cooling plate 1111. According to Figure 2 It is shown that the direction, Figure 2 The back of the middle cell 112 is all attached to the water cooling plate 1111. According to Figure 2 It is shown that the direction, Figure 3 The cooling fin 1112 is provided with four, and the four cooling fins 1112 are arranged around the side of the water cooling plate 1111, and the positioning frame is formed by the cooling fin 1112 and the water cooling plate 1111, and the series cell group is positioned by the positioning frame, and the installation of the cell 112 is facilitated. At the same time, the water cooling part 111 can exchange heat with the cooling fin 1112, so that the cooling fin 1112 has a lower temperature, and the cell 112 is wrapped by the water cooling part 111 and the cooling fin 1112 to exchange heat with the three surfaces of the cell 112, thereby improving the heat exchange area and the heat exchange efficiency. Further, the cooling fin 1112 located at the top end of the water cooling plate 1111 is provided with a plurality of spray holes 1113, and one spray hole 1113 corresponds to one cell 112.

[0038] In some examples, as Figure 4 The spray hole 1113 is located at the top end of the cell 112.

[0039] It can be understood that the spray hole 1113 can correspond to the middle of the top end of the cell 112, so that the high-temperature gas generated when the cell 112 is in thermal runaway is directed to spray from the middle of the top end of the cell 112, the spray position is balanced, the influence on the surrounding cells 112 is reduced, and the reliability is improved.

[0040] In some examples, as Figure 3 The cooling fin is protrudingly arranged relative to the water cooling plate 1111 towards the cell 112.

[0041] It can be understood that the four cooling fins 1112 are all protrudingly arranged relative to the water cooling plate 1111 towards the cell 112, so as to ensure that the cooling fin 1112 and the water cooling plate 1111 jointly form a positioning frame, and the series cell group is positioned by the positioning frame, and the installation of the cell 112 is facilitated. Further, in the case that the series cell group is installed in the water cooling part 111, the cooling fin 1112 protrudes from the cell 112, that is, the thickness of the cooling fin 1112 is greater than the thickness of the cell 112, so as to improve the protection capability of the cell 112 and improve the contact area between the cooling fin 1112 and the cell 112, thereby improving the heat exchange efficiency.

[0042] In some examples, the protruding dimension of the cooling fin 1112 relative to the battery cell 112 is 1 mm to 1.5 mm.

[0043] It can be understood that, if the protruding dimension of the cooling fin 1112 relative to the battery cell 112 is less than 1 mm, the wrapping effect of the cooling fin 1112 on the battery cell 112 is poor, and the fixing effect of the positioning frame on the battery cell 112 is poor. If the protruding dimension of the cooling fin 1112 relative to the battery cell 112 is greater than 1.5 mm, the volume of the soft-pack battery structure 100 is increased, thereby increasing the occupied area and affecting the vehicle space layout. Therefore, the protruding dimension of the cooling fin 1112 relative to the battery cell 112 is set to 1 mm to 1.5 mm.

[0044] In some examples, the cooling fin 1112 includes an aluminum fin.

[0045] It can be understood that the cooling fin 1112 can be selected as an aluminum fin, which has good thermal conductivity to enable the water-cooled plate 1111 to rapidly reduce the temperature of the cooling fin 1112, and has good structural strength and light weight.

[0046] In some examples, the series battery cell group is adhered to the water-cooled part 111 by a heat-conducting adhesive.

[0047] It can be understood that the end faces of the water-cooled plate 1111 and the two cooling fins 1112 facing the series battery cell group can be provided with a heat-conducting adhesive, so that the series battery cell group is fixed to the water-cooled part 111 by the adhesive, to ensure the fixing of the series battery cell group and improve the stability, and the heat-conducting adhesive has good heat-conducting effect, thereby ensuring the heat exchange efficiency of the water-cooled plate 1111, the cooling fins 1112 and the series battery cell group.

[0048] In some examples, the soft-pack battery structure 100 further includes a buffer part arranged at one end of the series battery cell group away from the water-cooled plate 1111, and the buffer part is used to absorb the swelling of the battery cell.

[0049] It can be understood that the soft-pack battery structure 100 can further be provided with a buffer part. Specifically, the buffer part is arranged at one end of the series battery cell group away from the water-cooled plate 1111. When the battery cell 112 generates heat during operation, the battery cell 112 is subjected to thermal expansion and contraction and swells. The buffer part can absorb the swelling of the battery cell 112 and improve the stability. Exemplarily, the buffer part can be selected as foam cotton.

[0050] In some examples, as shown in Figure 1 The soft-pack battery structure 100 further includes a first valve body 130 arranged at the inlet of the liquid inlet pipeline and a second valve body 140 arranged at the outlet of the liquid return pipeline.

[0051] It can be understood that the soft package battery structure 100 can also be provided with the first valve body 130 and the second valve body 140. The first valve body 130 is arranged at the inlet of the liquid inlet pipeline, and the second valve body 140 is arranged at the outlet of the liquid return pipeline. The flow of the low-temperature cooling liquid delivered to the water-cooled part 111 by the liquid inlet pipeline can be controlled by adjusting the first valve body 130, and the flow of the cooling liquid with a higher temperature after heat exchange delivered to the liquid return pipeline by the water-cooled part 111 can be controlled by adjusting the second valve body 140.

[0052] Exemplarily, the soft package battery structure 100 can also be provided with a plurality of temperature detection members and a controller. The temperature of each battery cell 112 in the series battery cell group can be detected in real time by the plurality of temperature detection members, and the controller can control the first valve body 130 and the second valve body 140 respectively. In this way, the controller can control the opening degree of the first valve body 130 and the second valve body 140 according to the temperature data sent by the temperature detection members, so as to adjust the flow of the low-temperature cooling liquid supplied by the water-cooled pipeline 120 and the flow of the cooling liquid with a higher temperature after heat exchange returned to the water-cooled pipeline 120, and ensure the cooling effect on the battery cell 112.

[0053] According to the embodiment of the second aspect of the present disclosure, a vehicle is provided, comprising: the soft package battery structure 100 according to any one of the above technical solutions; and a cooling system, wherein the water-cooled pipeline 120 is connected to the cooling system.

[0054] It can be understood that the vehicle comprises the soft package battery structure 100 according to any one of the above technical solutions, and thus has all the beneficial effects of the soft package battery structure 100, which will not be described herein again. The soft package battery structure 100 is connected to the cooling system of the vehicle through the water-cooled pipeline 120, so as to continuously provide the soft package battery structure 100 with low-temperature cooling liquid through the cooling system.

[0055] It should be understood that the terms first, second, etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Although the terms first, second, etc. can be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit can be called the second unit, and similarly the second unit can be called the first unit, without departing from the scope of the example embodiments of the present application.

[0056] It should be understood that the term "and / or" in this text merely describes an association relationship of associated objects, which means that three relationships can exist, for example, A and / or B can mean that A exists alone, B exists alone, and A and B exist together. The term " / and" in this text describes another association relationship of associated objects, which means that two relationships can exist, for example, A / and B can mean that A exists alone and A and B exist together. In addition, the character " / " in this text generally indicates that the associated objects before and after the character " / " are in an "or" relationship.

[0057] It should be understood that in the description of the present application, the terms "upper", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship when the disclosed product is commonly placed, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0058] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] The terms used herein are used only to describe specific embodiments and are not intended to limit example embodiments of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprise", "comprises", "include", and / or "includes" when used in this text specify the existence of the declared features, integers, steps, operations, units and / or components, and do not exclude the existence or addition of one or more other features, quantities, steps, operations, units, components and / or combinations thereof.

[0060] In the following description, specific details are provided to facilitate a full understanding of example embodiments. However, those skilled in the art will understand that example embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures and techniques can not be shown in unnecessary detail in order to avoid obscuring example embodiments.

[0061] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0062] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

Claims

1. A pouch battery structure, characterized by, Comprising: a plurality of battery modules, each of the battery modules comprising a water cooling part and a plurality of battery cells, wherein the tabs of the plurality of battery cells are connected to form a series battery cell group; the water cooling part comprises a water cooling plate and a cooling fin, the water cooling plate is provided with a cooling liquid flow channel, the cooling fin is arranged around the periphery of the water cooling plate, the water cooling plate and the cooling fin form a positioning frame body for positioning the series battery cell group, the cooling fin at the top of the series battery cell group is provided with a plurality of spray holes, the spray holes are used for exhaust in the case of thermal runaway of the battery cells; a water cooling pipeline for providing cooling liquid to the plurality of battery modules, wherein the water cooling pipeline comprises an inlet pipeline and a return pipeline, the inlet end of the cooling liquid flow channel is connected to the inlet pipeline; the outlet end of the cooling liquid flow channel is connected to the return pipeline.

2. The soft package battery structure according to claim 1, wherein: the spray holes are located in the middle of the top end of the battery cells.

3. The soft package battery structure according to claim 1, wherein: the cooling fin is protrudingly arranged relative to the water cooling plate towards the direction of the battery cells.

4. The soft package battery structure according to claim 3, wherein: the protruding size of the cooling fin relative to the battery cells is 1mm to 1.5mm.

5. The soft package battery structure according to claim 1, wherein: the cooling fin comprises an aluminum fin.

6. The soft package battery structure according to claim 1, wherein: the series battery cell group is adhered to the water cooling part by a heat-conducting adhesive. 7.The pouch battery structure of claim 1, wherein, Further comprising: a buffer part laid at one end of the series battery cell group away from the water cooling plate, the buffer part is used for absorbing the expansion of the battery cells. 8.The pouch battery structure of claim 1, wherein, Further comprising: a first valve body arranged at the inlet of the inlet pipeline; a second valve body arranged at the outlet of the return pipeline.

9. A vehicle characterized by comprising: Comprising: the soft package battery structure according to any one of claims 1 to 8; a cooling system, the water cooling pipeline is connected to the cooling system.

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