Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a battery module, a liquid cooling plate arranged at the top of the battery module, and a water absorption layer and an evaporation layer which are sequentially overlapped at the top of the liquid cooling plate, and the water absorption layer can generate a capillary phenomenon with condensed water formed on the liquid cooling plate, so that the condensed water rises along the water absorption layer or diffuses to the evaporation layer to evaporate. According to the battery pack disclosed by the utility model, the water absorption layer and the evaporation layer are arranged at the top of the liquid cooling plate, so that the condensate water at the top of the liquid cooling plate is absorbed to the evaporation layer through capillary action and is evaporated, the surface of the liquid cooling plate is kept dry, and the good use safety of the battery pack is further ensured.

Description

Technical Field

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

[0002] As new energy vehicles take up an increasing share in the market, the performance and safety of power batteries, as core components of new energy vehicles, have attracted much attention. The CTC (Cell to Chassis) solution is a technology that integrates the battery pack cover with the vehicle floor. It can effectively reduce the volume of the battery pack and thus increase the overall energy density. It is one of the current mainstream research directions.

[0003] In order to improve the performance of the power battery pack and make the battery cells work at a more suitable temperature, the power battery thermal management system plays a vital role. In the solution of using the cold plate in the thermal management system as the top box cover of the battery pack, condensation will form on the cold plate outside the battery pack.

[0004] However, when the power battery pack is charged and discharged under high temperature conditions, condensation will occur because the cold plate is in a low temperature state and is in direct contact with hot and humid air, forming small water droplets on the cold plate. Due to the existence of the flow channel, the water droplets gather in some areas and cannot be discharged naturally.

[0005] In this state for a long time, the liquid cooling plate is prone to rust, and the solution of applying paint on the liquid cooling plate will also cause the paint to fall off and rust after being soaked in water droplets for a long time. In the case of long-term corrosion, there is a high probability that the components will fail, causing performance and safety problems. Utility Model Content

[0006] In view of this, the utility model aims to provide a battery pack to ensure that the surface of the liquid cooling plate remains dry and has good safety in use.

[0007] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0008] A battery pack comprises a battery module, a liquid cooling plate arranged on the top of the battery module, and a water absorption layer and an evaporation layer sequentially stacked on the top of the liquid cooling plate;

[0009] The water absorption layer can generate a capillary phenomenon with the condensed water formed on the liquid cooling plate, so that the condensed water climbs or diffuses along the water absorption layer to evaporate at the evaporation layer.

[0010] Furthermore, the top of the liquid cooling plate is coated with a hydrophobic layer for preventing the condensed water from forming a water film, and the water absorption layer is arranged on the hydrophobic layer.

[0011] Furthermore, the evaporation layer presses the water absorbing layer onto the hydrophobic layer.

[0012] Furthermore, it also includes a lower shell; the battery module is arranged in the lower shell, and the liquid cooling plate and the evaporation layer are respectively connected to the lower shell.

[0013] Furthermore, the liquid cooling plate includes a substrate connected to the battery module, and a flow channel plate arranged on the substrate, and the water absorption layer is arranged on the flow channel plate.

[0014] Furthermore, the water absorption layer includes a plurality of transverse water absorption strips and a plurality of longitudinal water absorption strips; a plurality of transverse flow channels and a plurality of longitudinal flow channels are formed on the flow channel plate, and a transverse water absorption strip is provided between each adjacent two transverse flow channels, and a longitudinal water absorption strip is provided between each adjacent two longitudinal flow channels.

[0015] Furthermore, a plurality of transverse flow channels and a plurality of longitudinal flow channels are formed on the flow channel plate; a plurality of transverse through holes and a plurality of longitudinal through holes are provided on the water absorption layer, and each of the transverse through holes is arranged in one-to-one correspondence with each of the transverse flow channels, and each of the longitudinal through holes is arranged in one-to-one correspondence with each of the longitudinal flow channels.

[0016] Furthermore, the substrate and the battery module, the evaporation layer and the lower shell, and the liquid cooling plate and the lower shell are all glued together; and / or, the periphery of the evaporation layer is sunken to form a connecting flange, and the evaporation layer is connected to the lower shell via the connecting flange.

[0017] Furthermore, a heat-insulating cotton is provided between the battery module and the bottom wall of the lower shell; and / or a foam is provided between the side of the battery module and the side wall of the lower shell.

[0018] Furthermore, the water absorbing layer is made of sponge, plant fiber, wool or cloth.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The battery pack described in the utility model can achieve the purpose of evaporation of condensed water by arranging a water absorption layer and an evaporation layer on the top of the liquid cooling plate, absorbing the condensed water on the top of the liquid cooling plate to the evaporation layer through capillary action, thereby ensuring that the surface of the liquid cooling plate remains dry, improving the service life and safety of the liquid cooling plate, and thus ensuring that the battery pack has good safety in use.

[0021] Secondly, the hydrophobic layer can prevent the condensed water from forming a water film on the surface of the liquid cooling plate, making it easier to collect the condensed water, thereby protecting the liquid cooling plate from the infiltration and penetration of the condensed water, and providing the liquid cooling plate with good rust resistance. The evaporation layer presses the water absorption layer against the hydrophobic layer, so that the water absorption layer can contact the top of the liquid cooling plate, and ensure that the collected condensed water can be effectively absorbed by capillary action, thereby improving the efficiency of evaporation of condensed water.

[0022] Furthermore, placing each water-absorbing strip between two flow channels can not only ensure the absorption of condensed water and keep the surface of the liquid cooling plate dry, but also save space in the height direction of the battery pack, thereby ensuring that the battery pack has good safety in use. At the same time, the water-absorbing layer can also be provided with multiple transverse through holes and multiple longitudinal through holes, and the through holes are arranged one by one with the flow channels, so that the water-absorbing layer is still a whole, which is conducive to the installation of the water-absorbing layer.

[0023] In addition, the evaporation layer is sunken to form a connecting flange, which is convenient for the evaporation layer to be connected to the lower shell of the battery pack. Secondly, it is also conducive to forming an avoidance space for the liquid cooling plate in the middle, and can compress the water absorption layer a little to enhance the capillary effect. The setting of the thermal insulation cotton can fix it between the battery module and the lower shell by gravity, which plays a role in heat insulation of the battery module. By setting the foam, the battery pack as a whole has better anti-vibration performance, thereby improving the overall safety of the battery pack.

[0024] In addition, another object of the present invention is to provide a power device, in which the battery pack as described above is provided.

[0025] The power device described in the utility model and the above-mentioned battery pack have the same beneficial effects as compared with the traditional technology, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0027] Figure 1 A cross-sectional view of the overall structure of the battery pack according to an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of the entire structure of the water absorbing layer according to an embodiment of the utility model;

[0029] Figure 3 for Figure 2 A magnified view of the structure at center A;

[0030] Description of reference numerals:

[0031] 1. Battery module; 11. Thermal conductive adhesive; 12. Structural adhesive; 13. Thermal insulation cotton; 14. Foam;

[0032] 2. Liquid cooling plate; 21. Water absorption layer; 211. Horizontal water absorption strip; 212. Vertical water absorption strip; 213. Vertical through hole; 214. Horizontal through hole; 22. Evaporation layer; 221. Connection flange; 23. Hydrophobic layer; 24. Base plate; 25. Flow channel plate; 251. Horizontal flow channel; 252. Vertical flow channel;

[0033] 3. Lower shell. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] Embodiment 1

[0039] The present embodiment relates to a battery pack, which can utilize the capillary principle and natural convection to evaporate the liquid cooling water (or water droplets) on the top of the liquid cooling plate 2, so that the top surface of the liquid cooling plate 2 can be kept in a dry state, thereby improving the service life of the liquid cooling plate 2, thereby improving the overall safety quality of the battery pack.

[0040] In terms of overall structure, Figure 1As shown, the battery pack of this embodiment includes a battery module 1, a liquid cooling plate 2 disposed on the top of the battery module 1, and a water absorption layer 21 and an evaporation layer 22 sequentially stacked on the top of the liquid cooling plate 2. The water absorption layer 21 can generate a capillary phenomenon with the condensed water formed on the liquid cooling plate 2, so that the condensed water climbs or diffuses along the water absorption layer 21 to evaporate at the evaporation layer 22.

[0041] Here, by setting a water absorption layer 21 and an evaporation layer 22 on the top of the liquid cooling plate 2, the condensed water on the top of the liquid cooling plate 2 is absorbed into the evaporation layer 22 by capillary action, and the condensed water is evaporated to ensure that the surface of the liquid cooling plate 2 remains dry, thereby ensuring that the battery pack has good safety in use. And the battery module 1 mentioned in this embodiment is formed by arranging a plurality of battery cells in sequence, which are well known to those skilled in the art.

[0042] Based on the above overall introduction, in this embodiment, as a preferred implementation form, Figure 1 As shown, the top of the liquid cooling plate 2 is coated with a hydrophobic layer 23 for preventing condensed water from forming a water film, and the water absorbing layer 21 is arranged on the hydrophobic layer 23 .

[0043] It is understandable that the provision of the hydrophobic layer 23 can prevent the condensed water from forming a water film on the surface of the liquid cooling plate 2, making it easier to collect the condensed water, thereby protecting the liquid cooling plate 2 from being infiltrated and penetrated by the condensed water, and providing good rust resistance for the liquid cooling plate 2. Here, the hydrophobic layer 23 can be made of a hydrophobic coating well known to those skilled in the art, such as fluorosilicone material, nano titanium dioxide or polytetrafluoroethylene.

[0044] Secondly, in this embodiment, as a preferred implementation form, Figure 1 As shown, the evaporation layer 22 presses the water-absorbing layer 21 against the hydrophobic layer 23 .

[0045] The advantage of such a configuration is that the water absorption layer 21 can be in contact with the top of the liquid cooling plate 2, ensuring that the collected condensed water can be effectively absorbed by capillary action, thereby improving the efficiency of evaporation of the condensed water. The evaporation layer 22 can preferably use an evaporation device well known to those skilled in the art, such as an evaporation net.

[0046] In addition, as a preferred embodiment, Figure 1 As shown, the battery pack of this embodiment further includes a lower shell 3, the battery module 1 is arranged in the lower shell 3, and the liquid cooling plate 2 and the evaporation layer 22 are respectively connected to the lower shell 3. This arrangement has a simple structure and can improve the convenience of installation.

[0047] Furthermore, in this embodiment, as a preferred implementation form, Figure 1 As shown, the liquid cooling plate 2 includes a substrate 24 connected to the battery module 1 , and a flow channel plate 25 disposed on the substrate 24 , and a water absorbing layer 21 is disposed on the flow channel plate 25 .

[0048] Here, the setting of the flow channel plate 25 can make the condensed water gather in the area of ​​the flow channel plate 25 plane by gravity, so that the water absorption layer 21 can more easily absorb the condensed water by capillary action, thereby improving the convenience of collecting the condensed water.

[0049] See also Figure 2 As shown, in this embodiment, as a preferred implementation form, the water absorption layer 21 includes a plurality of transverse water absorption strips 211 and a plurality of longitudinal water absorption strips 212, and a plurality of transverse flow channels 251 and a plurality of longitudinal flow channels 252 are formed on the flow channel plate 25, and a transverse water absorption strip 211 is provided between each adjacent transverse flow channel 251, and a longitudinal water absorption strip 212 is provided between each adjacent longitudinal flow channel 252.

[0050] In the specific structure, a transverse water absorption strip 211 is provided between two adjacent transverse flow channels 251, and a longitudinal water absorption strip 212 is provided between two adjacent longitudinal flow channels 252, thereby ensuring the absorption of condensed water, keeping the surface of the liquid cooling plate 2 dry, and saving space in the height direction of the battery pack, thereby ensuring that the battery pack has good safety in use.

[0051] Of course, the water absorbing layer 21 of this embodiment may adopt other structural forms besides the above structural forms, for example Figure 2 and Figure 3 As shown, as a preferred implementation form, a plurality of transverse flow channels 251 and a plurality of longitudinal flow channels 252 are formed on the flow channel plate 25 of this embodiment, and a plurality of transverse through holes 214 and a plurality of longitudinal through holes 213 are provided on the water absorption layer 21, and each transverse through hole 214 is arranged in one-to-one correspondence with each transverse flow channel 251, and each longitudinal through hole 213 is arranged in one-to-one correspondence with each longitudinal flow channel 252.

[0052] With this arrangement, the water absorbing layer 21 remains as a whole, which is convenient for the installation of the water absorbing layer. The water absorbing layer 21 fits the plane between the flow channels, fully absorbs the condensation on the plane, keeps the top of the liquid cooling plate 2 dry, and improves the service life of the liquid cooling plate 2, thereby making the battery pack as a whole have good safety in use.

[0053] In addition, in this embodiment, as a preferred implementation form, Figure 1 As shown, the substrate 24 and the battery module 1 , the evaporation layer 22 and the lower shell 3 , and the liquid cooling plate 2 and the lower shell 3 are all glued together.

[0054] During specific implementation, a thermally conductive structural adhesive 11 is provided between the substrate 24 and the battery module 1 to increase the contact area between the battery module 1 and the liquid cooling plate 2. At the same time, the evaporation layer 22 and the lower shell 3, as well as the liquid cooling plate 2 and the lower shell 3 are bonded together by the thermally conductive structural adhesive 11, which not only improves the structural installation stability, but also effectively improves the heat dissipation effect of the battery module 1.

[0055] Furthermore, as a preferred implementation form, the periphery of the evaporation layer 22 of this embodiment is sunken to form a connecting flange 221, and the evaporation layer 22 is connected to the lower shell 3 through the connecting flange 221. In this way, it is not only convenient to connect the evaporation layer 22 to the lower shell 3 of the battery pack, but also conducive to forming an avoidance space for the liquid cooling plate in the middle, and can compress the water absorption layer a little to enhance the capillary effect.

[0056] In addition, in this embodiment, as a preferred implementation form, a heat preservation cotton 13 is provided between the battery module 1 and the bottom wall of the lower shell 3, and at the same time, a foam 14 is provided between the side of the battery module 1 and the side wall of the lower shell 3.

[0057] The setting of the thermal insulation cotton 13 can fix it between the battery module 1 and the lower shell 3 by gravity, thereby playing a role in heat insulation of the battery module 1, and by setting the foam cotton 14, the battery pack as a whole has better anti-vibration performance, thereby improving the overall safety of the battery pack.

[0058] In addition, in this example, as a preferred implementation form, the water-absorbing layer 21 is made of sponge, plant fiber, wool or cloth, which can not only fully absorb the condensed water but also help reduce costs.

[0059] When the battery pack involved in the present embodiment is in a high temperature and humid environment, the air contacts the liquid cooling plate 2 which is in cooling operation. After the high temperature and high humidity air reaches the dew point temperature, it condenses into small water droplets on the top of the liquid cooling plate 2. Under the action of the hydrophobic layer 23, the water droplets will not adhere to the top of the liquid cooling plate 2 to form a water film, but will continuously roll down to the plane on the flow channel plate 25 under the action of gravity, and continuously converge to form larger water droplets. After the water absorption layer 21 contacts the water droplets, the water droplets are absorbed into the evaporation layer 22 through the effect of capillary action. The water droplets absorbed thereto are evaporated by the natural convection of the evaporation layer 22. The continuous evaporation of the water droplets will generate power for the capillary action, and the water droplets are continuously absorbed and evaporated until they are completely evaporated.

[0060] Embodiment 2

[0061] This embodiment relates to a power device, in which the battery pack in the first embodiment is provided. In specific implementation, the power device may be an electric vehicle, and the battery pack is preferably directly integrated on the chassis of the electric vehicle (i.e., the CTC solution), and the liquid cooling plate 2 replaces the traditional battery pack cover, so as to improve the energy density and endurance performance of the battery pack.

[0062] The power device of this embodiment, by setting the battery pack in the first embodiment, can improve the quality of the finished product by ensuring that the surface of the liquid cooling plate 2 remains dry, making it safe to use, thereby improving market competitiveness.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It includes a battery module, a liquid cooling plate arranged on the top of the battery module, and a water absorption layer and an evaporation layer sequentially stacked on the top of the liquid cooling plate; The water absorption layer can generate a capillary phenomenon with the condensed water formed on the liquid cooling plate, so that the condensed water climbs or diffuses along the water absorption layer to evaporate at the evaporation layer.

2. The battery pack according to claim 1, characterized in that: The top of the liquid cooling plate is coated with a hydrophobic layer for preventing the condensed water from forming a water film, and the water absorption layer is arranged on the hydrophobic layer.

3. The battery pack according to claim 2, characterized in that: The evaporation layer presses the water-absorbing layer against the hydrophobic layer.

4. The battery pack according to claim 1, characterized in that: Also includes a lower housing; The battery module is arranged in the lower shell, and the liquid cooling plate and the evaporation layer are respectively connected to the lower shell.

5. The battery pack according to claim 4, characterized in that: The liquid cooling plate includes a substrate connected to the battery module and a flow channel plate arranged on the substrate, and the water absorption layer is arranged on the flow channel plate.

6. The battery pack according to claim 5, characterized in that: The water-absorbing layer comprises a plurality of transverse water-absorbing strips and a plurality of longitudinal water-absorbing strips; A plurality of transverse flow channels and a plurality of longitudinal flow channels are formed on the flow channel plate. A transverse water absorption strip is provided between each adjacent two transverse flow channels, and a longitudinal water absorption strip is provided between each adjacent two longitudinal flow channels.

7. The battery pack according to claim 5, characterized in that: The flow channel plate is formed with a plurality of transverse flow channels and a plurality of longitudinal flow channels; The water absorbing layer is provided with a plurality of transverse through holes and a plurality of longitudinal through holes, each of the transverse through holes is arranged in one-to-one correspondence with each of the transverse flow channels, and each of the longitudinal through holes is arranged in one-to-one correspondence with each of the longitudinal flow channels.

8. The battery pack according to claim 5, characterized in that: The substrate and the battery module, the evaporation layer and the lower shell, and the liquid cooling plate and the lower shell are all glued together; and / or, The periphery of the evaporation layer is sunken to form a connecting flange, and the evaporation layer is connected to the lower shell through the connecting flange.

9. The battery pack according to claim 4, characterized in that: A heat preservation cotton is arranged between the battery module and the bottom wall of the lower shell; and / or a foam cotton is arranged between the side of the battery module and the side wall of the lower shell.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The water absorbing layer is made of sponge, plant fiber, wool or cloth.

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