Battery pack liquid cooling structure, multi-layer battery pack and battery box

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack liquid cooling structure, a multilayer battery pack and a battery box.The battery pack liquid cooling structure comprises a liquid cooling plate, the liquid cooling plate comprises a shell and a cooling water channel arranged in the shell, and the battery pack liquid cooling structure further comprises a pole heat conduction block and a heat conduction medium, the pole heat conduction block is arranged on the outer wall of the shell and corresponds to a battery pole, and the heat conduction medium is positioned between the pole heat conduction block and the battery pole and is respectively contacted with the pole heat conduction block and the battery pole. The liquid cooling plate overcomes the defect that the surface of the battery cannot be uniformly cooled due to the fact that the conventional liquid cooling plate cannot perform targeted heat absorption cooling on the battery pole. According to the utility model, the top pole at the highest temperature part of the battery can be quickly cooled, and the space utilization rate can be optimized while the temperature balance is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a battery pack liquid cooling structure, a multi-layer battery pack and a battery box. Background Art

[0002] As the core component of electric vehicles, the stability of the performance and life of power batteries is crucial to the safety and reliability of the vehicle. In power batteries, the battery pack plays an important role in wrapping and protecting the battery cells. The design of the heat dissipation system of the battery pack directly affects the temperature control and long-term performance of the battery. The battery generates a lot of heat during operation. Excessive temperature will lead to loss of battery capacity and shortened battery life; therefore, keeping the battery operating temperature within a low range has an important impact on the performance and life of the battery, and the design of the battery pack heat dissipation system is the key to ensuring that the battery operating temperature is within the normal range.

[0003] For the battery system of commercial vehicles, the battery pack structure is generally in the form of multi-layer stacking, and the battery thermal management form is liquid cooling, which includes bottom liquid cooling and standard box liquid cooling. However, whether it is bottom liquid cooling or standard box liquid cooling, only the surface liquid cooling of the battery can be achieved, and the thermal management efficiency is low. For multi-layer stacked battery packs, a liquid cooling plate can also be inserted between two adjacent layers of batteries for liquid cooling. For example, a Chinese patent document discloses a battery pack and an electric device including the same, wherein the battery pack includes a box body, wherein a bottom liquid cooling plate, a battery module and a top liquid cooling plate are stacked in sequence from bottom to top in the box body, and the battery module includes at least two layers of battery modules stacked in sequence from bottom to top, and a middle liquid cooling plate is arranged between two adjacent layers of the battery modules. By adding a liquid cooling plate between adjacent battery layers for liquid cooling, the problem of high internal temperature between stacked battery layers is overcome to a certain extent.

[0004] However, due to the inconsistent heat dissipation efficiency of the top and bottom of batteries at different levels, especially the large temperature variation at the battery pole position, the liquid cooling plate of the above solution cannot perform targeted heat absorption and cooling of the battery pole, resulting in the battery being unable to be cooled evenly. Utility Model Content

[0005] The purpose of the utility model is to overcome the inability of existing liquid cooling plates to perform targeted heat absorption cooling on battery poles, resulting in the inability to evenly cool the battery surface, and to provide a battery pack liquid cooling structure, a multi-layer battery pack and a battery box. The utility model can quickly cool the top pole where the battery temperature is the highest, and can optimize space utilization while achieving temperature balance.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A battery pack liquid cooling structure includes a liquid cooling plate, the liquid cooling plate includes a shell, and a cooling water channel arranged inside the shell, the battery pack liquid cooling structure also includes a pole heat conductive block and a heat conductive medium, the pole heat conductive block is arranged on the outer wall of the shell and corresponds to the battery pole, and the heat conductive medium is located between the pole heat conductive block and the battery pole and contacts the two respectively.

[0008] The utility model arranges a pole heat-conducting block corresponding to the battery pole, utilizes the pole heat-conducting block and the heat-conducting medium, and directly contacts the shell of the liquid cooling plate with the battery pole, so that the traditional heat-conducting method through the air medium is changed to contact heat-conducting method, and the heat-conducting efficiency is improved. The pole heat-conducting block and the heat-conducting medium are both made of heat-conducting materials, which can quickly exchange heat and reduce the temperature of the highest point of the battery pack, so as to achieve a balanced decrease in the surface temperature of the battery pack and optimize the space utilization rate, thereby ensuring the safety and reliability of the battery pack.

[0009] Furthermore, one end of the pole heat conductive block is connected to the outer wall of the shell, and the other end of the pole heat conductive block is provided with a slot, which is used to cover the battery pole, and the heat conductive medium is filled in the slot. The pole heat conductive block is set in a slot shape, which can cover the battery pole. After covering, on the one hand, the slot structure can be used to form a support on the surface of the liquid cooling plate and the battery pack to support and fix the protruding position of the battery pole with a height difference, and on the other hand, the high temperature of the battery pole is isolated from other pores outside the battery pole, thereby increasing the contact heat dissipation area and efficiency of the battery pole, and using the pole heat conductive block and the heat conductive medium to quickly conduct heat exchange for cooling, so that the cooling is more balanced.

[0010] Furthermore, the heat-conducting medium is a heat-conducting structural adhesive or a heat-conducting silicone sheet, and preferably a heat-conducting structural adhesive is used. The heat-conducting structural adhesive is a silicone heat-sealing adhesive reinforced with siliconized nanofibers, which has excellent thermal stability and reliable thermal conductivity. It can improve thermal conductivity, reduce heat loss of structural materials, and effectively prevent heat transfer and accumulation of heat energy between heat sources, heat sinks and the surrounding environment. The utility model scientifically applies the heat-conducting structural adhesive to the liquid cooling structure of the battery pack as an important heat-conducting structural component, which helps to eliminate heat loss on the surface of the battery pole, thereby reducing the heat transfer of the extremely high temperature battery pole to the void space, and improving the heat dissipation performance of the shell through the pole heat-conducting block and the heat-conducting medium.

[0011] Furthermore, the shell is provided with a water inlet and a water outlet respectively connected to the two ends of the cooling water channel. The water inlet and the water outlet are respectively connected to the circulating cooling system, and heat exchange is performed through continuous cold source entering, thereby achieving liquid cooling.

[0012] Furthermore, the shell includes a first cooling plate and a second cooling plate connected to each other at two ends, and a cooling water channel is formed in the space between the first cooling plate and the second cooling plate.

[0013] Furthermore, the cooling water channel is a U-shaped or serpentine water channel.

[0014] Furthermore, in order to improve cooling efficiency, the shape of the cooling water channel can be formed by the internal channel after the first cooling plate and the second cooling plate are connected, so the shape of the cooling water channel can be changed by designing the die-casting shape of the first cooling plate and the second cooling plate.

[0015] A multi-layer battery pack comprises at least two battery packs stacked in sequence, wherein the battery pack liquid cooling structure as described above is arranged on the battery pole side of each battery pack, and the pole heat conductive block is arranged corresponding to the battery pole of the battery pack.

[0016] The battery packs of the utility model that are stacked in multiple layers can be stacked with the battery poles facing upwards or with the battery poles facing downwards. The battery pack liquid cooling structure is provided with pole heat conduction blocks and heat conduction medium specifically for cooling high-temperature battery poles. Therefore, the pole heat conduction blocks in the battery pack liquid cooling structure should be arranged on the battery pole side of the battery pack. If the battery pack liquid cooling structure is located between two battery packs, the battery pack liquid cooling structure can cool the battery pole side of one of the battery packs and the bottom of the other battery pack as an intermediate layer. The same battery pack liquid cooling structure is used to liquid cool the upper and lower battery packs at the same time, which optimizes space utilization, reduces production costs, and improves structural compactness.

[0017] Furthermore, a liquid cooling plate is provided at the bottom of each battery pack. It should be noted that the liquid cooling plate described in the utility model can be a conventional liquid cooling plate. Conventional liquid cooling plates are existing technologies and can be directly installed using liquid cooling plates currently available on the market. There are no battery poles at the bottom of the battery pack, and the temperature at the bottom of the battery pack is relatively balanced, so the cooling purpose can be achieved using conventional liquid cooling plates.

[0018] Furthermore, a heat-conducting layer is provided between the battery pack liquid cooling structure and the bottom of the battery pack, and between the conventional liquid cooling plate and the bottom of the battery pack. The heat-conducting layer can be a heat-conducting material such as a heat-conducting structural adhesive and a heat-conducting silicone sheet. The purpose of adding the heat-conducting layer is to conduct heat as a heat-conducting medium, and to fix and tighten the battery pack, so that the multi-layer stacked battery pack structure is more compact and has a higher structural strength.

[0019] A battery box comprises a box body and also comprises the multi-layer battery pack as described above placed in the box body.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model discloses a liquid cooling structure for a battery pack, by providing a pole heat-conducting block corresponding to the battery pole, and utilizing the pole heat-conducting block and a heat-conducting medium to directly contact the shell of the liquid cooling plate with the battery pole, so that the traditional heat conduction method through the air medium is changed to contact heat conduction, thereby improving the heat conduction efficiency, being able to quickly exchange heat, and reducing the temperature of the highest point of the battery pack. While achieving a balanced decrease in the surface temperature of the battery pack, the space utilization rate is optimized, and the safety and reliability of the battery pack are ensured.

[0022] In the multi-layer battery pack of the utility model, when the battery pack liquid cooling structure is located between two battery packs, the battery pack liquid cooling structure can serve as an intermediate layer to cool the battery pole side of one of the battery packs and the bottom of the other battery pack respectively. The same battery pack liquid cooling structure is used to liquid-cool the upper and lower battery packs at the same time, thereby optimizing space utilization, reducing production costs, and improving structural compactness. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the internal structure of the battery box in the utility model;

[0024] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0025] Figure 3 It is a schematic diagram of the arrangement of the battery pack and the battery pack liquid cooling structure inside the battery box of the present invention before stacking;

[0026] Figure 4 It is a schematic diagram of the structure after the battery pack and the battery pack liquid cooling structure inside the battery box of the utility model are stacked;

[0027] Figure 5 It is the overall structural diagram of the battery box in the utility model.

[0028] The illustrations are as follows:

[0029] 1-shell, 2-cooling water channel, 3-pole heat conductive block, 4-thermal conductive medium 100-battery pack, 200-battery pole, 300-box. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Example 1

[0033] like Figure 1 to Figure 2 As shown, a battery pack liquid cooling structure includes a liquid cooling plate, the liquid cooling plate includes a shell 1, and a cooling water channel 2 arranged inside the shell 1, the battery pack liquid cooling structure also includes a pole heat conductive block 3 and a heat conductive medium 4, the pole heat conductive block 3 is arranged on the outer wall of the shell 1 and corresponds to the battery pole 200, and the heat conductive medium 4 is located between the pole heat conductive block 3 and the battery pole 200 and contacts the two respectively.

[0034] like Figure 2 As shown, one end of the pole heat conductive block 3 is connected to the outer wall of the shell 1, and the other end of the pole heat conductive block 3 is provided with a slot, which is used to cover the battery pole 200, and the heat conductive medium 4 is filled in the slot. The pole heat conductive block 3 is set in a groove shape, which can cover the battery pole 200. After covering, on the one hand, the groove structure can be used to form a support on the surface of the liquid cooling plate and the battery pack 100 to support and fix the protruding position of the battery pole 200 with a height difference. On the other hand, the high temperature of the battery pole 200 is isolated from other pores outside the battery pole 200, increasing the contact heat dissipation area and efficiency of the battery pole 200, and using the pole heat conductive block 3 and the heat conductive medium 4 to quickly conduct heat exchange for cooling, so that the cooling is more balanced.

[0035] In this embodiment, the heat-conducting medium 4 is a heat-conducting structural adhesive. The heat-conducting structural adhesive is a silicon heat-sealing adhesive reinforced with siliconized nanofibers, which has excellent thermal stability and reliable thermal conductivity. It can improve thermal conductivity, reduce heat loss of structural materials, and effectively prevent heat transmission and heat energy accumulation between heat sources, heat sinks and the surrounding environment. The heat-conducting structural adhesive helps to eliminate heat loss on the surface of the battery pole 200, thereby reducing the heat transfer of the extremely high temperature battery pole 200 to the void space, and improving the heat dissipation performance of the shell 1 through the pole heat-conducting block 3 and the heat-conducting medium 4.

[0036] In this embodiment, the housing 1 is also provided with a water inlet and a water outlet respectively connected to both ends of the cooling water channel 2. The water inlet and the water outlet are respectively connected to the circulating cooling system, and heat exchange is performed by continuous cold source entering, thereby achieving liquid cooling.

[0037] In this embodiment, the housing 1 includes a first cooling plate and a second cooling plate connected to each other at both ends, and a cooling water channel 2 is formed in the space between the first cooling plate and the second cooling plate.

[0038] In this embodiment, the cooling water channel 2 is a U-shaped or serpentine water channel.

[0039] It should be noted that in order to improve cooling efficiency, the shape of the cooling water channel 2 can be formed by an internal channel after the first cooling plate and the second cooling plate are connected. Therefore, the shape of the cooling water channel 2 can be changed by designing the die-cast shape of the first cooling plate and the second cooling plate.

[0040] The advantage of this embodiment is that: the present application covers and surrounds the battery pole 200 by setting the pole heat conductive block 3, which can, on the one hand, play a role in fixing the liquid cooling plate on the surface of the battery pack 100, and on the other hand, by using the pole heat conductive block 3 and the heat conductive medium 4, the shell 1 of the liquid cooling plate is directly in contact with the battery pole 200, so that the traditional heat conduction method through the air medium is changed to contact heat conduction, which improves the heat conduction efficiency. The pole heat conductive block 3 and the heat conductive medium 4 are both made of heat conductive materials, which can quickly exchange heat and reduce the temperature of the highest point of the battery pack 100. While achieving a balanced decrease in the surface temperature of the battery pack 100, the space utilization is optimized to ensure the safety and reliability of the battery pack 100.

[0041] Example 2

[0042] like Figure 3 and Figure 4 As shown, a multi-layer battery pack includes at least two battery packs 100 stacked in sequence, and the battery pack liquid cooling structure as described in the above embodiment 1 is arranged on the battery pole side of each battery pack 100, and the pole heat conductive block 3 corresponds to the battery pole 200 of the battery pack 100.

[0043] In this embodiment, a liquid cooling plate is also provided at the bottom of each battery pack 100. It should be noted that the liquid cooling plate can be directly installed using a liquid cooling plate currently available on the market. There is no battery pole 200 at the bottom of the battery pack 100, and the temperature at the bottom of the battery pack 100 is relatively balanced, so a conventional liquid cooling plate can be used to achieve the cooling purpose.

[0044] In this embodiment, a heat-conducting layer is further provided between the battery pack liquid cooling structure and the bottom of the battery pack 100, and between the liquid cooling plate and the bottom of the battery pack 100. In this embodiment, the heat-conducting layer can be a heat-conducting structural adhesive, which is added to serve as a heat-conducting medium for heat conduction and to play a role in fixing and fastening, so that the multi-layer stacked battery pack 100 has a more compact structure and a higher structural strength.

[0045] The advantages of this embodiment are: the battery packs 100 stacked in multiple layers can be stacked with the battery poles 200 facing upwards or downwards, and the battery pack liquid cooling structure is provided with pole heat conductive blocks 3 and heat conductive medium 4 specifically for cooling high-temperature battery poles 200, so the pole heat conductive blocks 3 of the battery pack liquid cooling structure should be arranged on the battery pole side of the battery pack 100. If the battery pack liquid cooling structure is located between two battery packs 100, the battery pack liquid cooling structure can cool the battery pole side of one of the battery packs 100 and the bottom of the other battery pack 100 as an intermediate layer, and the same battery pack liquid cooling structure is used to liquid cool the upper and lower battery packs 100 at the same time, which optimizes space utilization, reduces production costs, and improves structural compactness.

[0046] Example 3

[0047] like Figures 3 to 5 As shown, a battery box includes a box body 300 and also includes a multi-layer battery pack as described in Example 2 placed in the box body 300.

[0048] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A battery pack liquid cooling structure, comprising a liquid cooling plate, the liquid cooling plate comprising a shell (1), and a cooling water channel (2) arranged inside the shell (1), characterized in that: The battery pack liquid cooling structure further comprises a pole heat conductive block (3) and a heat conductive medium (4); the pole heat conductive block (3) is arranged on the outer wall of the shell (1) and corresponds to the battery pole (200); the heat conductive medium (4) is located between the pole heat conductive block (3) and the battery pole (200) and is in contact with both.

2. A battery pack liquid cooling structure according to claim 1, characterized in that: One end of the pole heat-conducting block (3) is connected to the outer wall of the shell (1), and the other end of the pole heat-conducting block (3) is provided with a slot, the slot being used to cover the battery pole (200), and the heat-conducting medium (4) is filled in the slot.

3. A battery pack liquid cooling structure according to claim 1 or 2, characterized in that: The heat-conducting medium (4) is a heat-conducting structural adhesive or a heat-conducting silicone sheet.

4. A battery pack liquid cooling structure according to claim 1 or 2, characterized in that: The shell (1) is also provided with a water inlet and a water outlet respectively connected to the two ends of the cooling water channel (2).

5. A battery pack liquid cooling structure according to claim 1 or 2, characterized in that: The shell (1) comprises a first cooling plate and a second cooling plate which are connected to each other at both ends, and the space between the first cooling plate and the second cooling plate forms the cooling water channel (2).

6. A battery pack liquid cooling structure according to claim 1, characterized in that: The cooling water channel (2) is a U-shaped or serpentine water channel.

7. A multi-layer battery pack, comprising at least two battery packs (100) stacked in sequence, characterized in that: A battery pack liquid cooling structure as claimed in any one of claims 1 to 6 is arranged on the battery pole side of each battery pack (100), and the pole heat conductive block (3) corresponds to the battery pole (200) of the battery pack (100).

8. A multi-layer battery pack according to claim 7, characterized in that: A liquid cooling plate is also provided at the bottom of each battery pack (100).

9. A multi-layer battery pack according to claim 7, characterized in that: A heat-conducting layer is also provided between the battery pack liquid cooling structure and the bottom of the battery pack (100), and between the liquid cooling plate and the bottom of the battery pack (100).

10. A battery box, comprising a box body (300), characterized in that: It also includes a multi-layer battery pack as described in any one of claims 7 to 9 placed in the box (300).

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