阅读说明：本技术 一种动力电池液冷板结构 (Liquid cooling plate structure of power battery ) 是由 叶鸣 杨达洲 赵荣超 李巍华 卢仲康 王航 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种动力电池液冷板结构,涉及新能源汽车动力电池热管理技术领域,包括板基体,板基体内部挖空形成流动腔,流动腔内设置有多个呈不等间隔布置的翅片,多个翅片在流动腔内呈多行排布,多个翅片将流动腔分隔形成多条相互连通的且横截面不同的流道；以及流道入口和流道出口,设置在板基体上,流道入口和流道出口分别与流动腔连通。上述技术方案,通过变间距翅片设计,使流道截面在冷却液方向上不断变化,调节冷却液在动力电池液冷板结构内的流量分配,增强散热不良区域的换热效果,能针对电池发热量大的区域进行强化散热,改善电芯均温性。采用该动力电池液冷板结构后,相同产热条件下动力电池最高温度显著下降,温度均匀性显著改善。(The invention discloses a liquid cooling plate structure of a power battery, which relates to the technical field of thermal management of power batteries of new energy automobiles and comprises a plate substrate, wherein the plate substrate is hollowed to form a flow cavity, a plurality of fins which are arranged at unequal intervals are arranged in the flow cavity, the plurality of fins are arranged in multiple rows in the flow cavity, and the flow cavity is divided by the plurality of fins to form a plurality of flow channels which are mutually communicated and have different cross sections; and the runner inlet and the runner outlet are arranged on the plate substrate and are respectively communicated with the flow cavity. Above-mentioned technical scheme through the design of variable pitch fin, makes the runner cross-section constantly change in the coolant liquid direction, adjusts the flow distribution of coolant liquid in power battery liquid cold drawing structure, strengthens the heat transfer effect in the bad region of heat dissipation, can strengthen the heat dissipation to the region that battery calorific capacity is big, improves electric core temperature uniformity. After the liquid cooling plate structure of the power battery is adopted, the highest temperature of the power battery is obviously reduced under the same heat production condition, and the temperature uniformity is obviously improved.)

1. A power battery liquid cooling plate structure, characterized by comprising:

the plate base body is hollowed to form a flow cavity, a plurality of fins which are arranged at unequal intervals are arranged in the flow cavity, the fins are arranged in multiple rows in the flow cavity, and the flow cavity is divided by the fins to form a plurality of flow channels which are mutually communicated and have different cross sections; and

and the runner inlet and the runner outlet are arranged on the plate substrate and are respectively communicated with the flow cavity.

2. The power battery liquid cooling plate structure of claim 1, wherein: the transverse distance between the fins in the same row is set to be unequal, and the longitudinal distance between the fins in each row is set to be unequal.

3. The power battery liquid cooling plate structure of claim 2, wherein: the arrangement mode of the fins in the flow cavity is regularly changed, a parameter alpha is introduced, and definition is carried out

Wherein d is the characteristic size of the fin, h is the height of the flow channel, and alpha is more than or equal to 2 and less than or equal to 5;

the number of rows of the fins in the longitudinal direction is defined as n, and the longitudinal spacing of the fins in different rows is recorded as yj (j is 0,1, 2.. multidot.n);

the number of the fins in the first row is defined as m, and the transverse spacing between the fins in the first row is denoted as xi (i ═ 0,1, 2.. multidot.m).

4. The power battery liquid cooling plate structure of claim 3, wherein: the longitudinal spacing of the fins in each row is gradually reduced, the variation of the spacing is defined as delta y, and the variation range meets the requirement

5. The power battery liquid cooling plate structure of claim 4, wherein a first row of the fins is longitudinally spaced from an edge of the flow chamber by a distance y₀The longitudinal distance y between the fin and the edge of the flow cavity in the nth row is equal to the inlet width of the flow channel_nThe width of the flow channel outlet is equal, and the longitudinal spacing of the fins in different rows meets the following constraint conditions:

6. the power battery liquid cooling plate structure of claim 3, wherein: the transverse spacing of the fins in the first row is gradually reduced, the variation of the spacing is defined as delta x, and the variation range meets the requirement

7. The power cell liquid cooling plate structure of claim 6, wherein the lateral spacing of the fins in the first row satisfies the following constraint:

the number of the fins in the second row is m-1, the fins are arranged in a staggered manner with the fins in the first row, and the transverse offset of the ith (i is 1,2, …, m-1) fins in the second row relative to the fins in the first row is xi/2;

the number of the odd rows of fins is equal to that of the first row of fins, and the odd rows of fins are aligned in the longitudinal direction;

the number of the fins in the even number of rows is equal to that of the fins in the second row, and the fins are aligned in the longitudinal direction.

8. The power battery liquid cooling plate structure according to any one of claims 1 to 7, characterized in that: the flow channel inlet and the flow channel outlet are arranged diagonally.

9. The power battery liquid cooling plate structure according to any one of claims 1 to 7, characterized in that: the depth of the flow channel is equal to the height of the fin.

10. The power battery liquid cooling plate structure according to any one of claims 1 to 7, characterized in that: the corners of the flow cavity are all provided with round corner structures.

Technical Field

The invention relates to the technical field of thermal management of power batteries of new energy automobiles, in particular to a liquid cooling plate structure of a power battery.

Background

The new energy automobile power battery can produce a large amount of heats at the charge-discharge in-process, and the battery thermal management system is responsible for in time giving off the environment with the heat, keeps battery work in suitable temperature range to prolong battery life and guarantee battery safety in utilization. In addition, the temperature uniformity of the battery has an important influence on the uniformity of the battery, and in the design of a thermal management system, the temperatures of the battery pack and the battery cell are required to be kept consistent, and the highest temperature and the lowest temperature are only kept within 5 ℃. In the dynamic heat management method, the liquid cooling mode is widely applied to new energy automobiles due to large heat capacity and good cooling effect of a cooling medium. In a liquid cooling system, the internal flow passage structure of the liquid cooling plate has a significant effect on the temperature uniformity of the battery. Currently, in the fin type liquid cooling plate, the distribution of fins is mainly based on the equidistant design, and the uneven heat generation characteristic of the battery itself is not aimed at, thus leading to a large temperature difference inside the battery. During the working process of the battery, internal heating is uneven, so that the temperatures of different positions of the power battery are different, and the traditional equidistant fin liquid cooling plate design cannot take the effect into consideration.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, aiming at the non-uniformity of the self heating of the battery, the embodiment of the invention provides the liquid cooling plate structure of the power battery, the fins of the liquid cooling plate structure of the power battery are distributed to be non-uniform in the flowing direction, so that different positions of the liquid cooling plate structure of the power battery have different heat dissipation strengths, the non-uniformity of the heating of the battery is adapted, and the temperature uniformity of the battery is finally improved.

The power battery liquid cooling plate structure comprises a plate base body, wherein a flow cavity is formed by hollowing the inside of the plate base body, a plurality of fins which are arranged at unequal intervals are arranged in the flow cavity, the plurality of fins are arranged in multiple rows in the flow cavity, and the plurality of fins divide the flow cavity into a plurality of flow channels which are communicated with one another and have different cross sections; and the runner inlet and the runner outlet are arranged on the plate substrate and are respectively communicated with the flow cavity.

In an alternative or preferred embodiment, the lateral distances between the fins in the same row are arranged to be non-equidistant and the longitudinal distances between the fins in each row are arranged to be non-equidistant.

In an alternative or preferred embodiment, the arrangement of the fins in the flow chamber is regularly varied, and a parameter α is introduced to define

Wherein d is the characteristic size of the fin, h is the height of the flow channel, and alpha is more than or equal to 2 and less than or equal to 5;

the number of rows of the fins in the longitudinal direction is defined as n, and the longitudinal spacing of the fins in different rows is recorded as yj (j is 0,1, 2.. multidot.n);

the number of the fins in the first row is defined as m, and the transverse spacing between the fins in the first row is denoted as xi (i ═ 0,1, 2.. multidot.m).

In an alternative or preferred embodiment, the longitudinal spacing of the fins in each row is gradually decreased, and the variation of the spacing is defined as Δ y, and the variation range satisfies the requirement

In an alternative or preferred embodiment, the longitudinal spacing y of the fins from the edge of the flow chamber in the first row₀The longitudinal distance y between the fin and the edge of the flow cavity in the nth row is equal to the inlet width of the flow channel_nThe width of the flow channel outlet is equal, and the longitudinal spacing of the fins in different rows meets the following constraint conditions:

in an alternative or preferred embodiment, the transverse spacing of the fins in the first row is gradually decreased, and the variation of the spacing is defined as Δ x, and the variation range satisfies the requirement

In an alternative or preferred embodiment, the lateral spacing of the fins in the first row satisfies the following constraint:

the number of the fins in the second row is m-1, the fins are arranged in a staggered manner with the fins in the first row, and the transverse offset of the ith (i is 1,2, …, m-1) fins in the second row relative to the fins in the first row is xi/2;

the number of the odd rows of fins is equal to that of the first row of fins, and the odd rows of fins are aligned in the longitudinal direction;

the number of the fins in the even rows is equal to that of the fins in the second row, and the fins are aligned in the longitudinal direction;

in an alternative or preferred embodiment, the flow channel inlet and the flow channel outlet are diagonally arranged.

In an alternative or preferred embodiment, the depth of the flow channels is equal to the height of the fins.

In an alternative or preferred embodiment, the corners of the flow chamber are each provided with a rounded configuration.

Based on the technical scheme, the embodiment of the invention at least has the following beneficial effects: above-mentioned technical scheme through the design of variable pitch fin, makes the runner cross-section constantly change in the coolant liquid direction, adjusts the flow distribution of coolant liquid in power battery liquid cold drawing structure, strengthens the heat transfer effect in the bad region of heat dissipation, can strengthen the heat dissipation to the region that battery calorific capacity is big, improves electric core temperature uniformity. After the liquid cooling plate structure of the power battery is adopted, the highest temperature of the power battery is obviously reduced under the same heat production condition, and the temperature uniformity is obviously improved.

Drawings

The invention is further described below with reference to the accompanying drawings and examples;

FIG. 1 is a perspective view of an embodiment of the present invention;

FIG. 2 is a first front view of an embodiment of the present invention;

fig. 3 is a second front view of an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 to 3, an embodiment of the present invention shows a liquid cooling plate structure of a power battery, which includes a plate substrate 100, a flow channel inlet 101, and a flow channel outlet 102.

The plate base 100 is hollowed to form a flow cavity 103, the runner inlet 101 and the runner outlet 102 are arranged on the plate base 100, and the runner inlet 101 and the runner outlet 102 are respectively communicated with the flow cavity 103. The cooling liquid flows into the flow cavity 103 through the flow channel inlet 101, and then flows out through the flow channel outlet 102 to complete cooling and heat dissipation.

Specifically, a plurality of fins 200 are arranged at intervals in the flow cavity 103, and the plurality of fins 200 are arranged in a plurality of rows in the flow cavity 103. The fins 200 are independent from each other and do not interfere with each other, the flow cavities 103 are separated by the fins 200 to form a plurality of flow channels which are mutually communicated and have different cross sections, cooling liquid is unevenly distributed in the liquid cooling plate structure of the power battery, flows in the flow channels with constantly changing cross sections and generates uneven disturbance, and the heat exchange effect of the high-heat-content area of the battery can be effectively improved.

The lateral and longitudinal distances between the fins 200 are set to be unequal. It will be appreciated that the lateral distances between the fins 200 in the same row are set at different distances and the longitudinal distances between the fins 200 in each row are set at different distances.

In order to achieve the required flow splitting and disturbing effect, the flow cavity 103 is internally provided withThe arrangement of the fins 200 is regularly changed. Introduction of parameter α, definition

Wherein d is the characteristic dimension of the fin 200, in the embodiment, the fin 200 is designed in a cylindrical shape, the characteristic dimension is the diameter d, h is the height of the flow cavity 103, and α is not less than 2 and not more than 5. In other embodiments, the fins may have other geometries, such as prismatic structures, with a characteristic dimension of outer diameter d.

The number of the first row of fins is defined as m, and the transverse spacing between the first row of fins is recorded as xi (i is 0,1, 2.. multidot.m); the number of rows of fins in the longitudinal direction is defined as n, and the longitudinal pitch of the fins in different rows is denoted as yj (j ═ 0,1, 2.. times.n).

The longitudinal spacing of each row of fins is gradually decreased, the variation of the spacing is defined as delta y, and the variation range meets the requirement

Longitudinal spacing y of first row of fins from edge of flow chamber 103₀The longitudinal distance y between the n row of fins and the edge of the flow cavity is equal to the width of the flow channel inlet_nThe width of the fins is equal to the width of the outlet of the flow channel, and the longitudinal spacing of the fins in different rows meets the following constraint conditions:

the transverse spacing of the first row of fins is gradually decreased, the variation of the spacing is defined as delta x, and the variation range meets the requirement

The transverse spacing of the first row of fins satisfies the following constraint:

the number of the second row of fins is m-1, the second row of fins is staggered with the first row of fins, and the transverse offset of the ith (i is 1,2, …, m-1) fins of the second row relative to the first row of fins is xi/2;

the number of the odd-numbered rows of fins is equal to that of the first row of fins, and the odd-numbered rows of fins are aligned in the longitudinal direction;

the number of fins in the even rows is equal to the number of fins in the second rows, and the fins are aligned in the longitudinal direction.

The following shows one of the embodiments, a power battery liquid cooling plate structure provided with 13 rows of fins 200 for the flow chamber 103, wherein:

the flow channel inlet 101 and the flow channel outlet 102 are both arranged in a rectangle, and the width of each is 15 mm. The corner fillets of the flow channel are all R5, the width of the flow cavity 103 is W, the length of the flow cavity 103 is L, the distance between two edges of the flow cavity 103 and the upper edge and the lower edge of the plate base 100 is 5mm, and the distance between the other two edges of the flow cavity 103 and the side edge of the plate base 100 is 7 mm. The plate base 100 is 3mm thick, the runner is 2mm deep, the fin 200 is 2mm high, and the diameter of circular fin is 6 mm. The number of the first row of fins 200 is 6, and the pitches of the first row of fins 200 in the transverse direction are decreased by 14.04mm, 13.24mm, 12.44mm, 11.64mm, 10.84mm, 10.04mm and 9.24mm, respectively. The longitudinal spacing of the fins in different rows is respectively 15mm, 17.12mm, 16.12mm, 15.12mm, 14.12mm, 13.12mm, 12.12mm, 11.12mm, 10.12mm, 9.12mm, 8.12mm, 7.12mm and 15 mm.

It should be noted that the row number arrangement and the number arrangement in the present embodiment are defined based on the drawings, and are only for convenience of describing the technical solution of the present invention, and should not be construed as limiting the present invention.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.