Integrated liquid cooling bottom cover plate for liquid cooling battery pack and liquid cooling battery pack

Abstract

The utility model discloses an integrated liquid-cooled bottom cover plate for a liquid-cooled battery pack and the liquid-cooled battery pack thereof, and aims to overcome the defect of air leakage at the joint due to the split type scheme of a cooling plate and a bottom cover in the prior art. The heat conducting plate comprises a heat conducting plate, a runner plate and a reinforcing plate, the runner plate is arranged between the heat conducting plate and the reinforcing plate, adjacent plate bodies are attached, the heat conducting plate is a light plate, a continuous runner is formed in the runner plate through a concave part and the attachment of the runner plate and the heat conducting plate, and the runner is provided with a water inlet end and a water outlet end. A water inlet and a water outlet are formed in the positions, corresponding to the water inlet end and the water outlet end, of the heat conduction plate, the water inlet is communicated with the water inlet end, the water outlet is communicated with the water outlet end, a reinforcing structure is arranged on the reinforcing plate, the reinforcing structure is concave downwards, the flow channel is located in the reinforcing structure, the liquid cooling plate and the bottom cover are combined, and the problem of poor air tightness caused by deformation in the combining process can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical battery heat management, more specifically, it relates to a one-piece liquid cooling bottom cover plate for liquid cooling battery pack and liquid cooling battery pack thereof. BACKGROUND

[0002] Energy storage batteries are devices that can store electrical energy and release it when needed. They have a wide range of applications in power systems, renewable energy, electric vehicles, portable electronic devices, etc.

[0003] Energy storage batteries store and release energy through the process of converting chemical energy into electrical energy. During charging, electrical energy is converted into chemical energy and stored in the battery; during discharging, chemical energy is converted back into electrical energy and released.

[0004] During charging and discharging, the energy storage system generates a large amount of heat, if this heat is not effectively managed, it will cause the energy storage system to overheat, affect the working efficiency, shorten the service life, and even cause safety accidents. Among them, the temperature difference between each cell in the energy storage battery will have a significant impact on the performance and life of the battery. The temperature difference leads to inconsistent performance and capacity decay rate of battery monomers. Since the battery monomers in the battery pack are connected in series, the performance and capacity decay of any battery monomer will affect the overall performance of the assembly; single battery with higher temperature ages faster, produces more heat, and is more prone to high temperature, forming a vicious cycle; excessive internal temperature difference of the battery will cause uneven internal impedance, uneven current distribution, and uneven heat production, thereby affecting the performance of the battery and accelerating the capacity decay of the battery; the charging and discharging efficiency is significantly affected by temperature, and the typical charging and discharging efficiency of the battery reaches the highest value between 20-40 degrees Celsius; temperature distribution caused by temperature difference will reduce the overall performance of the battery; excessive temperature difference between battery monomers will destroy the uniformity of the battery pack, leading to reduced performance of the battery pack.

[0005] Therefore, the related technology provides multiple solutions including air cooling, liquid cooling, etc. Among them, the liquid cooling solution has better space utilization and energy density. The existing solution is generally a split type solution composed of a case and a liquid cooling plate. The combination process will cause structural deformation and poor air tightness. The structural deformation inducing factor is that the case and the liquid cooling plate cannot be fully surrounded and locked. The poor air tightness inducing factor is that the combination of the case and the liquid cooling plate structure causes air leakage at the joint. SUMMARY

[0006] The utility model overcomes the deficiency of air leakage at the joint caused by the split type solution of the existing cooling plate and bottom cover, and provides a one-piece liquid cooling bottom cover plate for liquid cooling battery pack and liquid cooling battery pack thereof. It can avoid the shortcomings of the split type solution, reduce air leakage, and improve air tightness.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] An integrated liquid cooling bottom cover plate for a liquid-cooled battery pack, comprising a heat-conducting plate, a flow channel plate, and a reinforcing plate, the flow channel plate is arranged between the heat-conducting plate and the reinforcing plate and is attached between the adjacent plate bodies, the heat-conducting plate is a light plate, a continuous flow channel is formed on the flow channel plate by recessing and attaching with the heat-conducting plate, the flow channel has a water inlet end and a water outlet end, the heat-conducting plate is provided with a water inlet and a water outlet at positions corresponding to the water inlet end and the water outlet end, the water inlet is communicated with the water inlet end, and the water outlet is communicated with the water outlet end, the reinforcing plate is provided with a reinforcing structure, the reinforcing structure is recessed, and the flow channel is located in the reinforcing structure.

[0009] The liquid cooling bottom cover plate is formed by combining three plate bodies into one, heat transfer is performed through the light surface of the heat-conducting plate, the flow channel plate generates a flow channel of cooling liquid, and the reinforcing plate provides the required strength of the bottom cover.

[0010] The flow channel plate is recessed and attached with the heat-conducting plate above to form a flow channel with both ends open. The water inlet and the water outlet on the heat-conducting plate are communicated with both ends of the flow channel, thereby supporting external pipelines to access cooling liquid.

[0011] Since the flow channel of the flow channel plate is generated by recessing, the reinforcing plate is provided with a recessed reinforcing structure at a position corresponding to the flow channel. Firstly, a space for placing the flow channel is generated, and secondly, the mechanical strength is enhanced through the reinforcing structure.

[0012] The heat-conducting plate, the flow channel plate, and the reinforcing plate are attached. In the production process, the connection reliability between the three plates can be improved through processes such as explosive welding and fasteners, so that the three plates form one plate, which is used for cooling the battery and also serves as the bottom cover of the battery, thereby reducing the possibility of air leakage caused by deformation and reducing the thickness, thereby providing potential for the energy density improvement of the battery pack.

[0013] As a preferred embodiment, the lowest part of the flow channel is attached with the top surface of the reinforcing structure. This feature makes the flow channel contact the reinforcing structure, thereby further enhancing the strength of the reinforcing structure.

[0014] As a preferred embodiment, the bottom surface of the reinforcing plate is fixedly connected with a bottom support profile at both ends in the width direction, and the bottom support profile is arranged along the length direction of the reinforcing plate. The reinforcing plate is raised through the structure.

[0015] As a preferred embodiment, the top surface of the heat-conducting plate is provided with a module fixing beam for limiting the battery module at positions close to both ends in the length direction, and the module fixing beam is arranged along the width direction of the heat-conducting plate.

[0016] As preferred, the flow channel comprises a total water inlet channel, water inlet branch channels, heat exchange channels, water outlet branch channels and a total water outlet channel, the total water inlet channel is communicated with four water inlet branch channels, each water inlet branch channel is in parallel, each water inlet branch channel is communicated with two heat exchange channels, the two heat exchange channels are in parallel, the total water outlet channel is communicated with four water outlet branch channels, each water outlet branch channel, each water outlet branch channel is communicated with the corresponding two heat exchange channels to form a continuous flow channel. Through the structure, the cold energy is as evenly divided as possible, and the uniformity between the battery modules is improved.

[0017] As preferred, the heat conduction plate, the flow channel plate and the reinforcing plate are fixedly connected.

[0018] A liquid-cooled battery pack comprises a battery module, a box cover, a front panel and an integrated liquid-cooled bottom cover plate for the liquid-cooled battery pack, the number of battery modules is four, each battery module is arranged at equal intervals along the width direction, and the two heat exchange channels communicated by each water inlet branch channel and water outlet branch channel are arranged correspondingly to a battery module. Each heat exchange channel accurately cools the battery module, and the uniformity between the battery modules is improved.

[0019] As preferred, the liquid-cooled bottom cover plate and the box cover are fixedly connected through a riveting piece.

[0020] Compared with the prior art, the liquid-cooled battery pack has the following beneficial effects:

[0021] (1) The combination of the liquid-cooled plate and the bottom cover can avoid the problem of poor air tightness caused by deformation during combination;

[0022] (2) The branches of the flow channel are arranged correspondingly to the battery modules above, so that the cold energy is fully utilized, and the uniformity between the battery modules is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an exploded view of the liquid-cooled bottom cover plate of the utility model;

[0024] Figure 2 is a cross-sectional view of the liquid-cooled bottom cover plate of the utility model;

[0025] Figure 3 is a top view of the flow channel plate of the utility model;

[0026] Figure 4 is a simple diagram of the flow channel;

[0027] Figure 5 is an exploded view of the battery pack of the utility model;

[0028] In the drawings:

[0029] Thermal conductive plate 1, flow channel plate 2, reinforcing plate 3, flow channel 4, water inlet end 5, water outlet end 6, water inlet 7, water outlet 8, reinforcing structure 9, module fixing beam 10, bottom support profile 11, total water inlet channel 12, water inlet branch channel 13, heat exchange channel 14, water outlet branch channel 15, total water outlet channel 16, battery module 17, box cover 18, front panel 19, liquid cooling bottom cover plate 20. DETAILED DESCRIPTION

[0030] The present disclosure will be further described below in conjunction with the drawings and embodiments.

[0031] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in order to provide a further understanding of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0032] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0033] In the present disclosure, the terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of the components or elements of the present disclosure, and cannot be understood as a limitation on the present disclosure.

[0034] In the present disclosure, the terms such as "fixedly connected", "connected", "connected" and the like should be understood broadly, which means that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant researchers or technicians in the art, the specific meaning of the above terms in the present disclosure can be determined according to the specific circumstances, and cannot be understood as a limitation on the present disclosure.

[0035] Embodiment:

[0036] Reference Figure 1As shown, an integrated liquid cooling bottom cover plate for a liquid cooling battery pack includes a heat conduction plate 1, a flow channel plate 2 and a reinforcing plate 3. The flow channel plate 2 is arranged between the heat conduction plate 1 and the reinforcing plate 3 and is attached between the adjacent plate bodies. The heat conduction plate 1 is a light plate. The flow channel plate 2 is formed with a continuous flow channel 4 by being concave and being attached to the heat conduction plate 1. The flow channel 4 has a water inlet end 5 and a water outlet end 6. The heat conduction plate 1 is provided with a water inlet 7 and a water outlet 8 corresponding to the positions of the water inlet end 5 and the water outlet end 6. The water inlet 7 is communicated with the water inlet end 5, and the water outlet 8 is communicated with the water outlet end 6. The reinforcing plate 3 is provided with a reinforcing structure 9. The reinforcing structure 9 is concave, and the flow channel 4 is located in the reinforcing structure 9. The top surface of the heat conduction plate 1 is provided with a module fixing beam 10 for limiting the battery module 17 at the positions close to both ends in the length direction. The module fixing beam 10 is arranged along the width direction of the heat conduction plate 1. The heat conduction plate 1, the flow channel plate 2 and the reinforcing plate 3 are fixedly connected. The bottom surface of the reinforcing plate 3 is fixedly connected with a bottom support profile 11 at both ends in the width direction. The bottom support profile 11 is arranged along the length direction of the reinforcing plate 3. The reinforcing plate 3 is raised by the structure.

[0037] Wherein, the Figure 1 、 Figure 2 As shown, the lowest part of the flow channel 4 is attached to the top surface of the reinforcing structure 9. This feature makes the flow channel 4 contact the reinforcing structure 9, thereby further improving the strength of the reinforcing structure 9.

[0038] Referring to Figure 3 and Figure 4 As shown, the flow channel 4 includes a total water inlet channel 12, a water inlet branch channel 13, a heat exchange channel 14, a water outlet branch channel 15 and a total water outlet channel 16. The total water inlet channel 12 is communicated with four water inlet branch channels 13. Each water inlet branch channel 13 is in parallel connection. Each water inlet branch channel 13 is communicated with two heat exchange channels 14. The two heat exchange channels 14 are in parallel connection. The total water outlet channel 16 is communicated with four water outlet branch channels 15. Each water outlet branch channel 15 is communicated with the corresponding two heat exchange channels 14 to form a continuous flow channel 4. Through this structure, the cooling capacity is as evenly distributed as possible, and the uniformity between each battery module 17 is improved.

[0039] Referring to Figure 5 As shown, a liquid cooling battery pack includes a battery module 17, a box cover 18, a front panel 19 and an integrated liquid cooling bottom cover plate 20 for the liquid cooling battery pack. The number of battery modules 17 is four. Each battery module 17 is arranged at equal intervals in the width direction. The two heat exchange channels 14 communicated by each water inlet branch channel 13 and water outlet branch channel 15 are arranged corresponding to one battery module 17. Each heat exchange channel 14 precisely cools the battery module 17, thereby improving the uniformity between each battery module 17. The liquid cooling bottom cover plate and the box cover 18 are fixedly connected by rivets.

[0040] The liquid cooling bottom cover plate is formed by combining three plate bodies into one plate body, heat is transferred through the light surface heat conduction plate 1; the flow channel plate 2 generates the flow channel 4 of the cooling liquid, and the reinforcing plate 3 provides the required strength of the bottom cover.

[0041] The flow channel plate 2 is concave downward and combined with the heat conduction plate 1 above to form the flow channel 4 which is open at both ends. The water inlet 7 and the water outlet 8 on the heat conduction plate 1 are communicated with both ends of the flow channel 4, thereby supporting the external pipeline to access the cooling liquid.

[0042] Since the flow channel 4 of the flow channel plate 2 is generated by being concave downward, the reinforcing structure 9 is concave downward at the position corresponding to the flow channel 4, which can first generate the space for placing the flow channel 4, and secondly, the mechanical strength is enhanced through the reinforcing structure 9.

[0043] The heat conduction plate 1, the flow channel plate 2 and the reinforcing plate 3 are combined, the connection reliability between the three plates can be improved through processes such as explosive welding and fasteners in the production process, so that the three plates form one plate, which is used for cooling the battery and also as the bottom cover of the battery, thereby reducing the possibility of leakage caused by deformation, and reducing the thickness, thereby providing potential for the energy density improvement of the battery pack.

[0044] The above-described embodiments are only preferred schemes of the present application, and do not limit the present application in any form, and there are other variants and modifications without exceeding the technical scheme recorded in the claims.

Claims

1. An integrated liquid-cooled bottom cover for a liquid-cooled battery pack, characterized in that, It includes a heat-conducting plate, a flow channel plate, and a reinforcing plate. The flow channel plate is disposed between the heat-conducting plate and the reinforcing plate and is attached to adjacent plates. The heat-conducting plate is a smooth plate. The flow channel plate has a continuous flow channel formed by the recess and the attachment with the heat-conducting plate. The flow channel has a water inlet end and a water outlet end. The heat-conducting plate is equipped with a water inlet and a water outlet at the corresponding positions of the water inlet and the water outlet end. The water inlet and the water outlet end are connected. The water outlet and the water outlet end are connected. The reinforcing plate is provided with a reinforcing structure. The reinforcing structure is recessed and the flow channel is located in the reinforcing structure.

2. The integrated liquid-cooled bottom cover plate for a liquid-cooled battery pack according to claim 1, characterized in that, The lowest point of the flow channel is in contact with the top surface of the reinforcing structure.

3. The integrated liquid-cooled bottom cover plate for a liquid-cooled battery pack according to claim 1, characterized in that, Both ends of the bottom width of the reinforcing plate are fixedly connected to bottom support profiles, which are set along the length of the reinforcing plate.

4. The integrated liquid-cooled bottom cover plate for a liquid-cooled battery pack according to claim 1, characterized in that, The top surface of the heat-conducting plate has module fixing beams near both ends along the length direction for limiting the battery module. The module fixing beams are arranged along the width direction of the heat-conducting plate.

5. The integrated liquid-cooled bottom cover plate for a liquid-cooled battery pack according to claim 1, characterized in that, The flow channel includes a main inlet channel, inlet branch channels, heat exchange channels, outlet branch channels, and a main outlet channel. The main inlet channel is connected to four inlet branch channels, which are connected in parallel. Each inlet branch channel is connected to two heat exchange channels, which are connected in parallel. The main outlet channel is connected to four outlet branch channels, which are connected to the corresponding two heat exchange channels to form a continuous flow channel.

6. An integrated liquid-cooled bottom cover for a liquid-cooled battery pack according to any one of claims 1 to 5, characterized in that, The heat-conducting plate, flow channel plate, and reinforcing plate are fixedly connected.

7. A liquid-cooled battery pack, characterized in that, It includes a battery module, a case cover, a front panel, and an integrated liquid-cooled bottom cover plate for a liquid-cooled battery pack as described in any one of claims 1 to 5. The number of battery modules is four, and each battery module is equally spaced along the width direction. Each inlet branch and outlet branch has two heat exchange channels connected to it, which are corresponding to one battery module.

8. A liquid-cooled battery pack according to claim 7, characterized in that, The liquid-cooled bottom cover and the box cover are fixedly connected by riveting.

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