Battery pack with tandem liquid cooling structure

Abstract

The utility model discloses a battery pack with a tandem liquid cooling structure, which comprises a plurality of cold plates and battery modules, the cold plates and the battery modules are arranged in a shell, the side edges of the cold plates are provided with liquid inlets and liquid outlets, the cold plates are internally provided with flow channels communicated with the liquid inlets and the liquid outlets, the flow channels are used for accommodating cooling liquid, and the flow channels are communicated with the liquid inlets and the liquid outlets. The adjacent cold plates are connected in series through the connecting channels, the heat conduction cushion layers with different heat conduction coefficients are arranged on the cold plates respectively, the battery modules are arranged on the heat conduction cushion layers, and the heat conduction cushion layers with different heat conduction coefficients are arranged on the different cold plates, so that the temperature of the battery modules arranged on the different cold plates in the battery pack is effectively balanced; therefore, the temperature difference between the battery modules in the battery pack is reduced, the service life of the battery is prolonged, and the overall performance of the battery pack is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and particularly relates to a battery pack with a series liquid cooling structure. Background Art

[0002] A battery pack is an integral unit assembled by a plurality of battery modules for storing and providing electric energy. During the operation of the battery pack, a large amount of heat is generated by the batteries in the battery pack. To prevent the battery temperature from being too high, a liquid cooling plate is usually arranged at the bottom of the battery pack, and the battery is cooled by introducing a coolant into the liquid cooling plate. However, since the coolant absorbs the heat generated by the battery during the flow in the flow channel of the liquid cooling plate, the temperature of the inlet side of the liquid cooling plate is relatively low, and the temperature of the outlet side is relatively high. Relatively, there is a temperature difference in different regions of the liquid cooling plate. For the entire battery pack, the cooling effects of the individual battery modules inside the battery pack are different, and thus the temperature difference between the battery modules in the battery pack is relatively large, which has a negative impact on the service life of the battery pack. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background art, and to provide a battery pack with a series liquid cooling structure.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A battery pack with a series liquid cooling structure includes a plurality of cold plates and battery modules. The cold plates and battery modules are installed in a housing. An inlet and an outlet are arranged on the side of each cold plate, and a flow channel communicating the inlet and the outlet is arranged inside the cold plate for accommodating the coolant. Adjacent cold plates are connected in series through a connection channel. Heat conduction pads with different heat conduction coefficients are respectively arranged on each cold plate, and battery modules are arranged on the heat conduction pads.

[0006] In some embodiments of the utility model, the heat conduction coefficient of the heat conduction pad arranged on the cold plate at the head end is the smallest, and the heat conduction coefficient of the heat conduction pad arranged on the subsequent series-connected cold plate is greater than that of the heat conduction pad arranged on the previous cold plate.

[0007] In some embodiments of the utility model, the heat conduction pad is made of a heat conduction silica gel pad.

[0008] In some embodiments of the utility model, the heat conduction silica gel pad is arranged on the front surface of the cold plate.

[0009] In some embodiments of the utility model, the number of heat conduction silica gel pads arranged on each cold plate is the same as the number of battery modules arranged on the cold plate.

[0010] In some embodiments of the present utility model, a plurality of support channels are arranged on the cold plate, and the support channels are arranged on both sides of the battery module. A plurality of mounting rods are arranged in the housing, and each mounting rod passes through the corresponding support channel, and both sides of the battery module are mounted on the corresponding mounting rods.

[0011] In some embodiments of the present utility model, the liquid inlet of the cold plate at the front end is communicated with a first channel, and the liquid outlet of the cold plate at the end is communicated with a second channel. The other end of the first channel is provided with a first connection port, and the other end of the second channel is provided with a second connection port. The first connection port and the second connection port are located on the same side of the housing.

[0012] In some embodiments of the present utility model, at least two mounting layers are arranged in the housing, and at least one cold plate is placed on each mounting layer, and a spacing for mounting the battery module is arranged between adjacent mounting layers.

[0013] As can be seen from the above description of the present utility model, compared with the prior art, the present utility model has the following beneficial effects:

[0014] 1. A series liquid cooling flow channel is adopted, and a plurality of heat-conducting silica gel pads and battery modules are arranged in columns on each cold plate, which is suitable for liquid cooling and heat dissipation of large battery packs, and is beneficial to reducing the temperature difference between battery modules inside the large battery pack.

[0015] 2. By arranging heat-conducting cushion layers with different heat-conducting coefficients on different cold plates, it is beneficial to balance the temperatures of the battery modules arranged on different cold plates in the battery pack.

[0016] 3. Along the flow direction of the coolant, the heat-conducting coefficients of the heat-conducting cushion layers arranged on the cold plates increase in sequence, so that the heat transfer effect of the heat-conducting cushion layers on the rear cold plates is better, thereby effectively balancing the temperatures of the battery modules arranged on different cold plates in the battery pack. When the heat generation amounts of the battery modules are relatively consistent, the heat conduction effect of the battery modules is more balanced, thereby reducing the temperature difference between the battery modules in the battery pack, improving the battery life, and being beneficial to ensuring the overall performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a schematic series diagram of the cold plates of the present utility model;

[0020] Figure 3 This is a schematic diagram of the bottom of the cold plate of the present utility model;

[0021] Main reference numerals description:

[0022] 1. Cold plate, 10. Liquid inlet, 11. Liquid outlet, 12. Connection channel, 13. First channel, 14. Second channel, 15. First connection port, 16. Second connection port, 17. Bracket channel, 2. Battery module, 3. Thermal conductive silica gel pad, 41. First layer, 42. Second layer, 51. First plate, 52. Second plate, 53. Third plate. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are the preferred embodiments of the present utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0024] In the claims, the description and the above-mentioned accompanying drawings of the present utility model, unless otherwise clearly defined, when using terms such as "first", "second" or "third", etc., are for distinguishing different objects and not for describing a specific order.

[0025] In the claims, the description and the above-mentioned accompanying drawings of the present utility model, unless otherwise clearly defined, for orientation terms, when using terms such as "center", "horizontal", "vertical", "level", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. to indicate the orientation or position relationship, it is based on the orientation and position relationship shown in the accompanying drawings, and is 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 or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present invention.

[0026] In the claims, the description and the above-mentioned accompanying drawings of the present utility model, unless otherwise clearly defined, when using terms such as "fixed connection" or "fixedly connected", should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-detachable fixed connection, detachable fixed connection, being integrally connected, and being fixedly connected through other devices or elements.

[0027] In the claims, the description and the above-mentioned drawings of the present utility model, when using terms such as "comprising", "having" and their variants, are intended to mean "including but not limited to".

[0028] Example 1, see Figures 1-3 :

[0029] A battery pack with a series liquid cooling structure includes a plurality of cold plates 1 and battery modules 2. An inlet 10 and an outlet 11 are provided on the side of the cold plate 1. A flow channel connecting the inlet 10 and the outlet 11 is provided inside the cold plate 1 for accommodating a coolant. Adjacent cold plates 1 are connected in series through a connection channel 12. Heat-conducting pads with different heat-conducting coefficients are arranged on each cold plate 1. By arranging heat-conducting pads with different heat-conducting coefficients on different cold plates 1 and performing heat transfer compensation with heat-conducting pads with different heat-conducting coefficients, the heat transfer effects between different cold plates 1 and the battery modules 2 arranged on the cold plates 1 are different, so as to balance the temperatures of the battery modules 2 arranged on different cold plates 1 in the battery pack.

[0030] The cold plates 1 and the battery modules 2 are installed in a housing.

[0031] As an implementation manner, the heat-conducting pad adopts a heat-conducting silica gel pad 3. The number of heat-conducting silica gel pads 3 arranged on each cold plate 1 is the same as the number of battery modules 2 arranged on the cold plate 1.

[0032] As an implementation manner, the heat-conducting silica gel pads 3 are arranged in columns on the cold plate 1. Preferably, two columns of heat-conducting silica gel pads 3 are arranged on the cold plate 1, and at least two heat-conducting silica gel pads 3 are arranged in each column.

[0033] As an implementation manner, the heat-conducting silica gel pads 3 are arranged on the same side of the cold plate 1. Preferably, the heat-conducting silica gel pads 3 are arranged on the front side of the cold plate 1.

[0034] The battery modules 2 are arranged on the heat-conducting pad, and the bottom surface of the battery module 2 is in contact with the heat-conducting pad. The heat-conducting pad facilitates the heat exchange between the battery module 2 and the cold plate 1, which is beneficial to ensuring the liquid cooling heat dissipation effect of the cold plate on the battery module 2.

[0035] As an implementation manner, the heat-conducting coefficient of the heat-conducting pad arranged on the cold plate 1 at the head end is the smallest, and the heat-conducting coefficient of the heat-conducting pad arranged on the subsequent cold plate 1 is greater than that of the heat-conducting pad arranged on the previous cold plate 1. The coolant enters through the inlet 10 of the cold plate 1 at the head end and then flows in series through the connection channel 12 to each cold plate 1;

[0036] During the heat exchange process of the coolant, along the flow direction of the coolant, the coolant continuously absorbs the heat of the cold plate 1, and the temperature of the coolant rises. Along the flow direction of the coolant, the thermal conductivity coefficient of the thermal conductive cushion layer arranged on the latter cold plate 1 is higher than that of the thermal conductive cushion layer arranged on the previous cold plate 1, making the heat transfer effect of the thermal conductive cushion layer on the rear cold plate 1 better. Thus, it effectively balances the temperatures of the battery modules 2 arranged on different cold plates 1 in the battery pack. When the heat generation of each battery module 2 is relatively consistent, the heat conduction effect of the battery modules 2 is more balanced, thereby reducing the temperature difference between the battery modules 2, improving the battery life, and being beneficial to ensuring the overall performance of the battery pack.

[0037] As an implementation manner, the liquid inlet 10 of the cold plate 1 at the head end is communicated with a first channel 13, the liquid outlet 11 of the cold plate 1 at the tail end is communicated with a second channel 14. The other end of the first channel 13 is provided with a first connection port 15, and the other end of the second channel 14 is provided with a second connection port 16. The first connection port 15 and the second connection port 16 are located on the same side of the housing, and the first connection port 15 and the second connection port 16 are used to connect the liquid cooling pipeline outside the housing.

[0038] Preferably, the first connection port 15 serves as the inlet of the coolant, the second connection port 16 serves as the outlet of the coolant, and the coolant flows out from the second connection port 16 after passing through the series-connected cold plates 1.

[0039] As an implementation manner, a plurality of support channels 17 are arranged on the cold plate 1, and the support channels 17 are arranged on both sides of the battery module 2. A plurality of mounting rods are arranged in the housing corresponding to the support channels 17. The bottom of the mounting rod is connected to the inner bottom of the housing, and each mounting rod passes through the corresponding support channel 17, and both sides of the battery module 2 are mounted on the corresponding mounting rods.

[0040] It can be understood that the housing includes a battery upper shell and a battery lower shell, and the mounting rods are arranged on the battery lower shell.

[0041] As an implementation manner, at least two mounting layers are arranged in the housing, and at least one cold plate 1 is placed on each mounting layer, and a spacing for mounting the battery module 2 is arranged between adjacent mounting layers.

[0042] Preferably, the number of the cold plates 1 is three, which are a first plate 51, a second plate 52, and a third plate 53 respectively. The number of the mounting layers is two. The mounting layer includes a first layer 41 located at the upper part and a second layer 42 located at the lower part. The first layer 41 is provided with the first plate 51 and sets it as the head end. The second layer 42 is provided with the second plate 52 and the third plate 53, and the second plate 52 and the third plate 53 are arranged side by side at the same horizontal height.

[0043] The first plate 51 located at the head end is provided with a heat-conducting cushion layer having a first heat conductivity coefficient X1, the subsequent series-connected second plate 52 is provided with a heat-conducting cushion layer having a second heat conductivity coefficient X2, and the third plate 53 located at the tail end is provided with a heat-conducting cushion layer having a third heat conductivity coefficient X3. It can be understood that the numerical values of the first heat conductivity coefficient X1, the second heat conductivity coefficient X2, and the third heat conductivity coefficient X3 increase in sequence.

[0044] Embodiment 2:

[0045] Repeat Embodiment 1, but heat-conducting silica gel pads 3 are arranged on both the front and back surfaces of the cold plate 1, and battery modules 2 are correspondingly arranged on both the front and back surfaces of the cold plate 1.

[0046] Embodiment 3:

[0047] Repeat Embodiment 1, but only one installation layer is provided inside the housing, and the cold plate 1 is arranged on this installation layer.

[0048] The above description of the specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the inspiration of the present invention or the above embodiments, those of ordinary skill in the art, combined with common general knowledge, ordinary technical knowledge in the art, and / or existing technologies, can obtain modifications, equivalent replacements, or other improvements to the embodiments of the present invention or some of its technical features through logical analysis, reasoning, or limited experiments, and all of them should be included within the protection scope of the present invention.

Claims

1. A battery pack with a series liquid cooling structure, characterized in that: The invention comprises a plurality of cold plates and battery modules, wherein the cold plates and battery modules are installed in a shell, a liquid inlet and a liquid outlet are arranged on the side of the cold plate, a flow channel connecting the liquid inlet and the liquid outlet is arranged in the cold plate, the flow channel is used to contain the coolant, adjacent cold plates are connected in series through connecting channels, thermal conductive pads with different thermal conductivity coefficients are arranged on each cold plate, and battery modules are arranged on the thermal conductive pads.

2. A battery pack with a series liquid cooling structure according to claim 1, characterized in that: The thermal conductivity of the thermally conductive pad layer arranged on the cold plate at the head end is the smallest, and the thermal conductivity of the thermally conductive pad layer arranged on the subsequent cold plate in series is greater than the thermal conductivity of the thermally conductive pad layer arranged on the previous cold plate.

3. The battery pack with a series liquid cooling structure according to claim 1, characterized in that: The thermal conductive pad layer is a thermal conductive silicone pad.

4. The battery pack with a series liquid cooling structure according to claim 3, characterized in that: The thermally conductive silicone pad is arranged on the front side of the cold plate.

5. The battery pack with a series liquid cooling structure according to claim 3, characterized in that: The number of thermally conductive silicone pads arranged on each cold plate is the same as the number of battery modules arranged on the cold plate.

6. The battery pack with a series liquid cooling structure according to claim 5, characterized in that: The cold plate is provided with a plurality of bracket channels, the bracket channels are arranged on both sides of the battery module, a plurality of mounting rods are arranged in the shell corresponding to the bracket channels, the mounting rods pass through the corresponding bracket channels, and both sides of the battery module are mounted on the corresponding mounting rods.

7. The battery pack with a series liquid cooling structure according to claim 1, characterized in that: The liquid inlet of the cold plate at the head end is connected to the first channel, the liquid outlet of the cold plate at the end is connected to the second channel, the other end of the first channel is provided with a first connecting port, the other end of the second channel is provided with a second connecting port, and the first connecting port and the second connecting port are located on the same side of the shell.

8. A battery pack with a series liquid cooling structure according to any one of claims 1 to 7, characterized in that: At least two installation layers are arranged in the housing, and at least one cold plate is placed on each installation layer. A spacing for installing battery modules is arranged between adjacent installation layers.

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