A power battery device based on normal distribution heat dissipation method

Abstract

The present invention discloses a power battery device based on a normal distribution heat dissipation method, which relates to the field of batteries and includes a battery box, a battery and a cooling fan. The battery is provided in plurality and arranged in a rectangular array in the battery box, and the distance between two adjacent batteries is the same. The cooling fans are respectively arranged on the front and rear sides of the battery box and are arranged alternately. Each cooling fan is located at the position where the mean of the normal distribution density curve formed by the batteries is located. The present invention adopts a battery arrangement method based on the normal distribution density curve, which can make full use of the cooling gas blown out by the cooling fan, so that the absolute temperature difference between the battery cells is reduced, and there is no cooling dead corner in the battery pack.

Description

Technical Field

[0001] The present invention belongs to the field of batteries, and in particular relates to a power battery device based on a normal distribution heat dissipation method. Background Art

[0002] Compared with other batteries, lithium batteries have advantages such as high energy density and long service life. At present, lithium batteries have become the mainstream battery for automotive power batteries, but the performance and life of lithium batteries are closely related to the temperature of the battery. Excessive temperature will not only accelerate the battery life decay, but also bury safety hazards. Therefore, effective heat dissipation for lithium batteries has become an important means to prevent power battery temperatures from being too high.

[0003] In the existing air-cooled heat dissipation method, the fan is mostly randomly set on one side of the battery module, which has the problem of low wind utilization. This is because the random flow of wind has a certain distribution pattern. If we regard the battery as an iron nail and the cooling gas blown out by the fan as a small ball, the total amount of cooling gas passing around each battery will form a normal distribution. If the traditional fan layout method is used, there will be uneven heat dissipation of the battery, which will have a negative impact on the use and life of the battery. Summary of the invention

[0004] The object of the present invention is to provide a power battery device based on a normal distribution heat dissipation method to solve the above-mentioned defects caused by the prior art.

[0005] A power battery device based on a normal distribution heat dissipation method includes a battery box, batteries and a cooling fan. The batteries are provided in plurality and arranged in a rectangular array in the battery box, and the distance between two adjacent batteries is the same. The cooling fans are respectively arranged on the front and rear sides of the battery box and are arranged alternately, and each cooling fan is located at the position where the mean of the normal distribution density curve formed by the batteries is located.

[0006] Preferably, the method for calculating the position of the cooling fan is as follows:

[0007] (1) The normal density distribution function expression is as shown in formula (1). Since the problem of the function graph moving along the X-axis is not considered, the value of μ in the formula is 0, and formula (2) can be obtained:

[0008]

[0009]

[0010] Therefore, we only need to determine the value of σ to obtain the complete expression of the normal distribution;

[0011] (2) A normal distribution density curve is drawn based on the simulation results of the airflow, the value of σ is determined based on the normal distribution density curve, and the relationship between σ and R is obtained through multiple simulation experiments, where R represents half of the distance between the centers of two adjacent battery circles;

[0012] (3) The shape of the normal distribution density curve is adjusted by adjusting the value of σ, and the size of R is determined to obtain the arrangement of the batteries;

[0013] (4) Set the cooling fan at the location where the mean of the normal distribution density curve is located.

[0014] Preferably, the normal distribution density curves may be multiple and interconnected to form a curve.

[0015] Preferably, the air supply directions of the two cooling fans arranged alternately are opposite.

[0016] Preferably, the battery is a cylindrical battery.

[0017] Preferably, a controller is installed in the area between the normal distribution density curves at both ends and the two ends of the battery box.

[0018] The advantages of the present invention are: the present invention adopts a battery arrangement method based on a normal distribution density curve, which can fully utilize the cooling gas blown out by the cooling fan, so that the absolute temperature difference between battery cells is reduced and there is no cooling dead corner in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the cylindrical battery arrangement method based on the normal distribution density curve in the present invention.

[0020] Figure 2 This is a cross-sectional diagram of local battery distribution.

[0021] Figure 3 This is the simulation result of airflow distribution based on the normal distribution density curve. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0023] like Figure 1As shown, a power battery device based on a normal distribution heat dissipation method, the circles in the figure represent cylindrical batteries, including a battery box, batteries and a cooling fan, the batteries are multiple and arranged in a rectangular array in the battery box, the batteries are cylindrical batteries, the distance between two adjacent batteries is the same, the cooling fans are respectively arranged on the front and rear sides of the battery box and are arranged alternately, and the air supply directions of the two cooling fans arranged alternately are opposite, and each cooling fan is located at the position where the mean of the normal distribution density curve formed by the batteries is located;

[0024] The method for calculating the position of the cooling fan is as follows:

[0025] (1) The normal density distribution function expression is as shown in formula (1). Since the problem of the function graph moving along the X-axis is not considered, the value of μ in the formula is 0, and formula (2) can be obtained:

[0026]

[0027]

[0028] Therefore, we only need to determine the value of σ to obtain the complete expression of the normal distribution;

[0029] (2) A normal distribution density curve is drawn based on the simulation results of the airflow, the value of σ is determined based on the normal distribution density curve, and the relationship between σ and R is obtained through multiple simulation experiments, where R represents half of the distance between the centers of two adjacent battery circles;

[0030] (3) The shape of the normal distribution density curve is adjusted by adjusting the value of σ, and the size of R is determined to obtain the arrangement of the batteries;

[0031] (4) Set the cooling fan at the location where the mean of the normal distribution density curve is located.

[0032] In practice, since there are a large number of batteries, it is impossible to cover all batteries with only one normal distribution density curve. Therefore, the normal distribution density curves can be multiple and interconnected to form a curve similar to a wave.

[0033] In the present invention, since it is not easy to set corresponding cooling fans for cooling in the area between the normal distribution density curves at both ends and the two ends of the battery box, other components such as a controller can be installed.

[0034] Figure 2 A cross-sectional diagram showing the local battery distribution is shown. The cross-sectional line portion represents the cylindrical battery, and the radius R of the circle outside the cross-sectional line represents half the distance between the centers of the two cylindrical batteries.

[0035] Figure 3The simulation results of airflow distribution based on the normal distribution density curve are shown, which can be used to determine the distribution of cylindrical batteries and the corresponding setting positions of cooling fans.

[0036] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A power battery device based on a normal distribution heat dissipation method, comprising a battery box, a battery and a heat dissipation fan, characterized in that: The batteries are arranged in a plurality in a rectangular array in the battery box, and the distance between two adjacent batteries is the same. The cooling fans are respectively arranged on the front and rear sides of the battery box and are arranged alternately, and each cooling fan is located at the position where the mean of the normal distribution density curve formed by the batteries is located; The method for calculating the position of the cooling fan is as follows: (1) The normal density distribution function expression is as shown in formula (1). Since the problem of the function graph moving along the X-axis is not considered, the value of μ in the formula is 0, and formula (2) can be obtained: （1） （2） Therefore, we only need to determine the value of σ to obtain the complete expression of the normal distribution; (2) A normal distribution density curve is drawn based on the simulation results of the airflow, the value of σ is determined based on the normal distribution density curve, and the relationship between σ and R is obtained through multiple simulation experiments, where R represents half of the distance between the centers of two adjacent battery circles; (3) The shape of the normal distribution density curve is adjusted by adjusting the value of σ, and the size of R is determined to obtain the arrangement of the batteries; (4) Set the cooling fan at the location where the mean of the normal distribution density curve is located.

2. A power battery device based on a normal distribution heat dissipation method according to claim 1, characterized in that: The normal distribution density curves are multiple and are connected to form a curve.

3. A power battery device based on a normal distribution heat dissipation method according to claim 2, characterized in that: The air supply directions of the two cooling fans arranged alternately are opposite.

4. A power battery device based on a normal distribution heat dissipation method according to claim 1, characterized in that: The battery is a cylindrical battery.

5. A power battery device based on a normal distribution heat dissipation method according to claim 2, characterized in that: A controller is installed in the area between the normal distribution density curves at both ends and the two ends of the battery box.

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