Battery Pack

Abstract

The utility model relates to a battery pack, which has: a plurality of battery cells; a heat insulating material arranged between each battery cell; and a cooling flow path for cooling the battery cells. The heat insulating material has an ultrasonic generator and a fixing unit, the ultrasonic generator is arranged inside the heat insulating material, and the fixing unit fixes the ultrasonic generator to the heat insulating material. Thus, the cooling efficiency of the battery cells can be improved.

Description

Technical Field

[0001] The utility model relates to a battery pack. Background Art

[0002] Patent Document 1 discloses a structure in which a throttle portion is provided in an intake air flow path in order to equalize the temperature of battery cells in a battery pack.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-099937

[0004] In the battery cell, for example, the temperature distribution is different between the upper side and the lower side, and therefore the structure disclosed in Patent Document 1 has room for improvement in cooling efficiency. Utility Model Content

[0005] The present invention is completed in view of the above situation, and an object of the present invention is to provide a battery pack capable of improving the cooling efficiency of battery cells.

[0006] The battery pack involved in the utility model comprises: a plurality of battery cells; an insulating material arranged between the battery cells; and a cooling flow path for cooling the battery cells, the insulating material having an ultrasonic generator and a fixing unit, the ultrasonic generator being arranged inside the insulating material, and the fixing unit fixing the ultrasonic generator to the insulating material.

[0007] According to the utility model, the ultrasonic generator is fixed to the insulating material by using a fixing component, and the electrolyte inside the battery cell is stirred by using ultrasonic waves, so that the electrolyte can be easily and evenly cooled, thereby improving the cooling efficiency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a side view showing a schematic structure of a battery pack according to an embodiment.

[0009] Figure 2 It is a plan view showing the structure of a heat insulating material of a battery pack according to an embodiment.

[0010] Figure 3 The figure is a diagram showing the structure of the heat insulating material of the battery pack according to the embodiment. Figure 2 Cross-sectional view when cut along line XX. DETAILED DESCRIPTION

[0011] The battery pack according to the embodiment of the present invention will be described with reference to the drawings. The components in the following embodiment include components that can be easily replaced by those skilled in the art or are substantially the same.

[0012] Reference Figures 1 to 3The battery pack according to the embodiment is described below. The battery pack according to the embodiment is used as a battery for a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an electric vehicle (BEV), or the like, for example.

[0013] Figure 1 1 is a side view showing a schematic structure of a battery pack according to an embodiment. The battery pack 1 includes a plurality of battery cells 11, a plurality of heat insulating materials 12, and a cooling flow path 13. In addition, in this figure, the battery cells 11, the heat insulating materials 12, and the cooling flow path 13 are shown separately, but in fact, they are arranged closely. In addition, in this figure, only the characteristic parts of the present invention in the structure of the battery pack 1 are shown, and other structures are omitted.

[0014] The battery cells 11 are stacked in a predetermined direction in the battery pack 1. The battery cells include, for example, a case filled with an electrolyte, an electrode body, a positive electrode, a negative electrode, and a separator.

[0015] The heat insulating material 12 is used to insulate the battery cells 11. The heat insulating material 12 is disposed between the battery cells. The specific structure of the heat insulating material 12 will be described below.

[0016] Figure 2 1 is a top view showing a specific structure of the thermal insulation material 12. Figure 3 For along Figure 2 The heat insulating material 12 includes a main body 121 , an outer frame 122 , an ultrasonic generator 123 , and a fixing unit 124 .

[0017] The main body 121 is made of a material having heat-insulating and insulating properties. The outer frame 122 is used to support the main body 121 and is arranged around the main body 121. The ultrasonic generator 123 is provided inside the thermal insulation material 12. In addition, the ultrasonic generator 123 is fixed to the outer frame 122 of the thermal insulation material 12 by a fixing unit (rib) 124.

[0018] In the battery pack of the embodiment, by installing the ultrasonic generator 123 in the space inside the heat insulating material 12, as described later, a stirring function of the electrolyte inside the battery cell 11 is added to the effect of the heat insulating material 12. This can circulate the electrolyte and reduce temperature distribution.

[0019] The cooling flow path 13 is used to cool the battery cell 11. The cooling flow path 13 is, for example, disposed at the bottom of the battery cell 11. The specific configuration of the cooling flow path 13 is not limited, and for example, it may be a water-cooled cooling unit using a water pump or the like, or a refrigerant cooling unit using a cooling fan or the like.

[0020] Here, in the conventional battery cells, the internal temperature distribution has a large deviation, and the high temperature portion cannot be effectively cooled. In addition, when the temperature distribution occurs inside the battery cell, since the internal resistance value increases with the temperature distribution, it is necessary to perform control such as limiting the charging current. The reason for this problem is that since the electrolyte, which is mainly responsible for heat transfer inside the battery cell, does not flow, the temperature distribution cannot be eliminated (or it takes a long time to eliminate the temperature distribution).

[0021] Therefore, in the battery pack of the embodiment, by setting the ultrasonic generator 123 inside the thermal insulation material 12, as shown in FIG. Figure 1 As shown, when the battery pack 1 is in operation, the electrolyte is stirred by ultrasound. In this way, by stirring the electrolyte inside the battery cell 11, warm electrolyte is always supplied to the bottom of the battery cell 11 that exchanges heat through the cooling flow path 13. This ensures a temperature difference with the refrigerant in the cooling flow path 13, improving cooling performance. In addition, by stirring the electrolyte by ultrasound, the temperature distribution inside the battery cell 11 can be immediately made uniform.

[0022] In addition, the rigidity of the heat insulating material of the conventional battery cell is insufficient, so even if an ultrasonic generator is installed, the heat insulating material will vibrate and the ultrasonic wave cannot be smoothly transmitted to the battery cell. On the other hand, in the battery pack involved in the embodiment, by providing a fixing unit (rib) 124 around the ultrasonic generator 123, the ultrasonic generator 123 can be reliably fixed, and the ultrasonic wave can be efficiently transmitted to the battery cell 11.

[0023] According to the battery pack of the embodiment described above, the ultrasonic generator 123 is fixed to the insulating material 12 by the fixing unit 124, and the electrolyte inside the battery cell 11 is stirred by ultrasonic waves, so that the electrolyte can be easily and uniformly cooled. This can improve the cooling efficiency of the battery cell 11.

[0024] Those skilled in the art can easily derive further effects and variations. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Therefore, various changes can be made without departing from the spirit or scope of the general concept of the utility model defined by the technical solution and its equivalents.

Claims

1. A battery pack, characterized in that: have: a plurality of battery cells; Insulating material disposed between each battery cell; and A cooling flow path is used to cool the battery cell. The thermal insulation material includes an ultrasonic generator and a fixing unit. The ultrasonic generator is provided inside the thermal insulation material. The fixing unit fixes the ultrasonic generator to the thermal insulation material.

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