CN206834287U - It is a kind of directly to the temperature controlled liquid cooling structure of battery core - Google Patents

Abstract

It is a kind of directly to the temperature controlled liquid cooling structure of battery core that the utility model creates offer, including mainboard and it is some in layered arrangement in the cooling layer of the mainboard side, the mainboard is provided with fluid inlet channel and fluid outlet channels, there is the hollow channel that can be circulated for fluid in the cooling layer, the hollow channel has the hollow entrance and hollow outlet connected respectively with the fluid inlet channel and fluid outlet channels, and the hollow channel of the cooling layer is communicated between the fluid inlet channel and fluid outlet channels in parallel.The utility model creates the control that can improve to battery core temperature, ensures that battery core is operated within the scope of a relatively good temperature.

Description

A liquid cooling structure that directly controls the temperature of the battery cell

technical field

The invention belongs to the technical field of battery systems in the new energy automobile industry, and in particular relates to a liquid cooling structure that directly controls the temperature of the battery core.

Background technique

With the rapid development of the new energy vehicle market, the demand for innovation in thermal management technology is becoming more and more intense. With the increase in energy, the heat generated by the battery during operation increases. Conventional natural cooling and air cooling can no longer meet the requirements of heat dissipation. Requirements, in the event of an accident, once the heat cannot be exported in time, it is very easy to cause the thermal runaway of the battery; and because the antifreeze has a high specific heat capacity, it can take away a large amount of heat per unit time, and the liquid cooling solution can better meet the requirements of the battery. Module cooling requirements.

At present, the battery pack liquid cooling system mainly fixes cooling devices such as cold plates on the outside of the battery module through bolting, riveting, welding, bonding and other connection methods to control the temperature of the entire battery module. The cooling system is in contact with the entire battery module, and can only cool or heat the area where the module is in direct contact with the liquid cooling system, affecting the temperature uniformity of the entire module and making the cooling efficiency low; Near the tabs of the battery cells, the highest temperature point of the battery module is located in the middle cells. This liquid cooling solution cannot effectively cool down the highest temperature points of the battery cells and the module.

Contents of the invention

In view of this, the present invention aims to propose a liquid cooling structure that directly controls the temperature of the battery core, so as to improve the control over the temperature of the battery core and ensure that the battery core works within a relatively good temperature range.

In order to achieve the above object, the technical solution created by the present invention is achieved in this way:

A liquid cooling structure, comprising a main board and several cold layers arranged in layers on one side of the main board, the main board is provided with a fluid inlet channel and a fluid outlet channel, and the cold layer has a hollow space for fluid circulation channel, the hollow channel has a hollow inlet and a hollow outlet respectively communicated with the fluid inlet channel and the fluid outlet channel, and the hollow channel of the cold layer communicates between the fluid inlet channel and the fluid outlet channel in parallel .

Wherein, the hollow channel in the cold layer has a meandering bent structure or a stepped structure. The width of the part connected in parallel at the center of the ladder-shaped structure gradually increases, and the part connected in parallel at the center of the ladder-shaped structure may be rectangular or arc-shaped.

Further, the circuitous bent structure or stepped structure of the hollow channel in the cold layer is formed by the hollow cavity in the cold layer being blocked by the staggered closed structures; The vertically arranged thin walls of the two layers can also preferably be closed lines formed by corresponding positions of the upper and lower layers connecting the cold layer, which are relatively inwardly recessed and combined together; the closed structure is preferably set as 1, 3, 5. Further, the hollow inlet and the hollow outlet of the hollow channel are respectively located on both sides of its meandering bent structure or stepped structure.

Wherein, the cold layer is made of elastic materials capable of withstanding a certain pressure, such as PP-T20.

Wherein, the total thickness of the cold layer is within 2 mm, preferably within 1 mm.

Wherein, the hollow outlet of the hollow channel in the cold layer is larger than the hollow inlet.

Wherein, the cold layer is respectively connected to the main board through an arc-shaped structure, and an arc-shaped channel is arranged in the arc-shaped structure, so that the hollow channel in the cold layer communicates with the fluid inlet channel and the fluid outlet channel of the main board through the arc-shaped channel.

Wherein, the fluid inlet channel and the fluid outlet channel are respectively hollow channels provided in the main board, and are preferably channels extending in a straight line. The main board may be a whole plate body provided with the fluid inlet channel and the fluid outlet channel at the same time, or may be two different plates provided with the fluid inlet channel and the fluid outlet channel respectively.

Compared with the prior art, the present invention has the following advantages:

1) It can directly cool down the heat-generating battery cell at high temperature; directly heat up the battery cell at low temperature, which not only ensures the heating and cooling efficiency, but also ensures that the temperature of the battery cell is controlled within a small temperature range;

2) The parallel structure of the liquid cooling system is adopted, which is beneficial to the temperature uniformity of each battery cell;

3) The overall thickness of the liquid cooling layer of the battery cell is within the range of 2mm, ensuring that the volume of the entire module will not have much impact;

4) Strong design flexibility, the number of cell liquid cooling layers can be controlled, suitable for modules with different numbers of blocks;

5) The integrated design has a simple structure and reduces the design cycle.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a schematic diagram of the overall structure of an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of FIG. 1 in a plan view direction.

3 and 4 are partial enlarged views of FIG. 1 .

Fig. 5 and Fig. 6 are schematic diagrams of flow direction structures of other two hollow channels.

Explanation of reference signs:

1-main board; 11-fluid inlet channel; 12-fluid outlet channel; 2-cooling layer; 21-closed line; 22-arc structure.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings.

The structure created by the present invention is shown in Figures 1-4, including a main board 1 and several cold layers 2 arranged in layers on one side of the main board 1, and the main board 1 is provided with a fluid inlet channel 11 and a fluid outlet channel 12 , there is a hollow passage in the cold layer 2 that can be used for fluid circulation, and the hollow passage has a hollow inlet and a hollow outlet that communicate with the fluid inlet passage 11 and the fluid outlet passage 12 respectively, and the hollow passage of the cold layer 2 It communicates between the fluid inlet channel 11 and the fluid outlet channel 12 in parallel.

The layered parallel structure of the cold layer 2 is beneficial to the temperature uniformity of each battery cell, and avoids the local temperature of several central battery cells from being too high. The distance between the cold layers 2 can be adjusted and designed according to needs, so as to ensure that a module block is placed between every two layers of cold layers 2, so that the cold layers 2 can be in direct contact with the batteries in the middle. The cooling fluid flows in the cold layer 2, so that the cooling fluid is in a spread state in the cold layer 2, which expands the area of contact and heat exchange, and is more conducive to heat exchange than traditional tubular channels or structures.

Wherein, the hollow channel in the cold layer 2 has a circuitous bent structure, which is beneficial to prolong the flow path of the cooling fluid (as shown by the flow line shown by the dotted arrow in Figure 2), and at the same time facilitates the flow of the fluid in the cold layer 2 Spreading can also make the cooling fluid flow near the tabs of the battery to ensure the temperature uniformity of the entire battery cell. Or, the hollow channel in the cold layer 2 can also be a stepped structure with both sides straight through and the center parallel and parallel (as shown in the flow lines shown by the dashed arrows in Figures 5 and 6). Increase step by step to increase the flow resistance of the fluid flowing out directly. The central parallel part of the stepped structure can be rectangular (as shown in FIG. 5 ) or arc-shaped (as shown in FIG. 6 ).

Further, the meandering bent structure or stepped structure of the hollow channel in the cold layer 2 is formed by the hollow cavity in the cold layer 2 being blocked by staggered closed structures; the closed structure can be connected to the cold layer 2 The vertically arranged thin walls of the upper and lower layers of the cold layer 2 can also preferably be closed lines 21 (as shown in Figure 4) formed by corresponding positions of the upper and lower layers of the cold layer 2 that are relatively inwardly recessed and combined together; The number of closed structures is preferably set at 1-5. Further, the hollow inlet and the hollow outlet of the hollow channel are respectively located on both sides of its meandering bent structure or stepped structure.

Wherein, the cold layer 2 is made of elastic material capable of withstanding a certain pressure, such as PP-T20, to ensure the strength of the product, reduce the risk of liquid leakage and ensure the convenient flow of cooling liquid.

Wherein, the total thickness of the cold layer 2 is within 2 mm, preferably within 1 mm, so as to ensure the space utilization of the product and the spreading of the cooling fluid.

Wherein, the hollow outlet of the hollow channel in the cold layer 2 is larger than the hollow inlet, which can reduce the system flow resistance.

Wherein, the cold layer 2 is respectively connected to the main board 1 through an arc-shaped structure 22, and an arc-shaped channel is arranged in the arc-shaped structure 22, so that the hollow channel in the cold layer 2 is respectively connected to the fluid inlet channel 11 and the fluid outlet of the main board 1 through the arc-shaped channel. Channel 12 communicates. The arc-shaped structure 22 belongs to a flexible connection mode, and the cold layer 2 is relatively thin overall, so that the cold layer 2 is easy to fold up, which facilitates the installation of the module and ensures that there is no stress at the bend after the module is installed.

Wherein, the fluid inlet channel 11 and the fluid outlet channel 12 are respectively hollow channels provided in the main board 1 , and are preferably channels extending in a straight line. Since the fluid inlet channel 11 and the fluid outlet channel 12 are connected through the hollow channel of the cold layer 2, the two may not communicate on the main board 1, so the main board 1 can be provided with a fluid inlet channel 11 and a fluid outlet channel at the same time. 12 can also be two different plates with fluid inlet channels 11 and fluid outlet channels 12 respectively.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the Within the protection scope of the present invention.

Claims (11)

1. A liquid cooling structure, comprising a main board and several cold layers arranged in layers on one side of the main board, the main board is provided with a fluid inlet passage and a fluid outlet passage, and the cold layer has a The hollow channel has a hollow inlet and a hollow outlet respectively communicated with the fluid inlet channel and the fluid outlet channel, and the hollow channel of the cold layer communicates with the fluid inlet channel and the fluid outlet channel in parallel between. 2 . The liquid cooling structure according to claim 1 , wherein the hollow channel in the cooling layer is in a meandering bent structure or a stepped structure. 3 . 3. The liquid cooling structure according to claim 2, characterized in that, the circuitous bent structure or stepped structure of the hollow channel in the cold layer is blocked by the hollow cavities in the cold layer via the staggered closed structures. And formed. 4. The liquid-cooled structure according to claim 3, wherein the closed structure is a vertically arranged thin wall connecting the upper and lower layers of the cold layer, or a corresponding position of the upper and lower layers connecting the cold layer Relatively inwardly recessed and joined together to form a closed line. 5 . The liquid cooling structure according to claim 2 , wherein the width of the central parallel part of the stepped structure increases step by step, and the central parallel part of the stepped structure is rectangular or arc-shaped. 6 . 6 . The liquid cooling structure according to claim 2 , wherein the hollow inlet and the hollow outlet of the hollow channel are respectively located on both sides of its meandering bent structure or stepped structure. 7 . 7. The liquid cooling structure according to claim 1, wherein the cold layer is made of PP-T20; the total thickness of the cold layer is within 2mm. 8. The liquid cooling structure according to claim 1, characterized in that, the hollow outlet of the hollow channel in the cooling layer is larger than the hollow inlet. 9. The liquid cooling structure according to claim 1, wherein the cold layer is respectively connected to the main board through an arc-shaped structure, and an arc-shaped channel is arranged in the arc-shaped structure, so that the hollow channel in the cold layer passes through the arc-shaped channel and the main board respectively. The fluid inlet channel and the fluid outlet channel of the main board are in communication. 10 . The liquid cooling structure according to claim 1 , wherein the fluid inlet channel and the fluid outlet channel are respectively hollow channels provided in the main board. 11 . 11. The liquid cooling structure according to claim 10, wherein the hollow channel is a channel extending in a straight line.