CN118367264A - A battery pack structure for energy storage - Google Patents

Abstract

The invention discloses a battery pack structure for energy storage, which comprises a pack body, wherein a plurality of battery cells are arranged in the pack body to form a battery cell group; a heat exchange plate is arranged below the battery cell group, and heat exchange liquid is filled in the heat exchange plate; a semiconductor refrigerating sheet is arranged under the heat exchange plate in a clinging way; the semiconductor refrigerating sheet is electrically connected with a direct current power supply through a first closed circuit and a second closed circuit respectively; when the first closed circuit and the second closed circuit are respectively conducted, the current directions in the semiconductor refrigerating sheet are opposite. The invention can realize heating or refrigerating of the battery core according to the requirement, and only adopts the semiconductor refrigerating sheet as a cold source or a heat source, has simple structure and lower cost, heats or refrigerates the battery core through the heat exchange plate, and utilizes the heat exchange liquid to carry out buffer heat storage, thereby maintaining the stability of heating or refrigerating the battery core.

Description

A battery pack structure for energy storage

Technical Field

The present invention relates to the field of electricity, and in particular to a battery pack structure for energy storage.

Background technique

At present, there are two main ways to manage the battery pack liquid cooling system: air cooling and liquid cooling. Compared with air cooling technology, the battery pack liquid cooling system has a high heat exchange density and occupies a small area, which can ensure a lower battery cell temperature and better temperature uniformity. However, due to the influence of factors such as ambient temperature and wind speed, the air cooling system is relatively difficult to control and has low heat dissipation efficiency. However, compared with the construction of a liquid cooling system, the air-cooled thermal management system does not require an external air circulation system to provide cooling air. Because of this, the cost of the liquid cooling circulation system is relatively high, the weight is relatively large, and the structure is more complex.

The current refrigeration structure usually uses semiconductor refrigeration chips, such as the invention patent CN201920491333.7, which uses semiconductor refrigeration chips to directly cool or heat the battery cells. However, the production can only choose one of the methods. In addition, the semiconductor refrigeration chip heats up and down too quickly, which may cause the battery cells to burn out when heated, and may also cause the battery cells to cool down too quickly when cooled, affecting the battery efficiency.

Invention patent CN202310518122.9 is to install a semiconductor refrigeration sheet on the periphery of the battery pack shell, and control the temperature of the battery pack by controlling the semiconductor refrigeration sheet. Invention patent CN202122346070.0 is to arrange multiple battery modules and multiple semiconductor refrigeration components at intervals inside the bottom shell, wherein the semiconductor refrigeration components are connected to form an active heat dissipation channel to dissipate heat for a single battery module, so that the temperature of the battery pack is maintained in a relatively constant safe temperature range. However, these two methods can only cool the battery, but in cold weather, the battery also needs to be heated and kept warm to ensure its working stability, which makes it unable to adapt to cold climates.

Summary of the invention

In order to solve the above technical problems, the present invention proposes a battery pack structure for energy storage.

The purpose of the present invention is achieved through the following technical solutions:

A battery pack structure for energy storage, comprising a pack body, wherein a battery cell group formed by a plurality of battery cells is installed in the pack body; a heat exchange plate is installed below the battery cell group, and the interior of the heat exchange plate is filled with heat exchange fluid; a semiconductor cooling sheet is installed closely below the heat exchange plate; the semiconductor cooling sheet is electrically connected to a DC power supply through a first closed circuit and a second closed circuit respectively; wherein, when the first closed circuit and the second closed circuit are respectively turned on, the current directions in the semiconductor cooling sheet are opposite.

A further improvement is that the first closed circuit includes a first conductive wire and a second conductive wire; one end of the first conductive wire is electrically connected to the positive electrode of the semiconductor refrigeration chip, and the other end is electrically connected to the positive electrode of the DC power supply; one end of the second conductive wire is electrically connected to the negative electrode of the semiconductor refrigeration chip, and the other end is electrically connected to the negative electrode of the DC power supply; a first switch is installed on the first conductive wire or the second conductive wire;

The second closed circuit includes a third conductive wire and a fourth conductive wire, one end of the third conductive wire is electrically connected to the positive electrode of the semiconductor refrigeration plate, and the other end is electrically connected to the negative electrode of the DC power supply, one end of the fourth conductive wire is electrically connected to the negative electrode of the semiconductor refrigeration plate, and the other end is electrically connected to the positive electrode of the DC power supply; a second switch is installed on the third conductive wire or the fourth conductive wire.

As a further improvement, the heat exchange plate comprises an upper plate and a lower plate, a heat exchange liquid loop is formed on the lower plate, and two ends of the heat exchange liquid loop are respectively connected to a liquid inlet and a liquid outlet of an internal circulation pump.

Further improvement, the upper plate is formed with a docking hole for installing the internal circulation pump

As a further improvement, the package body comprises a lower box body, and an upper cover is provided on the upper cover of the lower box body.

As a further improvement, a cavity is formed between the bottom surface of the lower box body and the semiconductor refrigeration plate; in coordination with the cavity, a fan mounting hole for mounting a fan and an air outlet for exhausting air are formed on the lower box body.

The beneficial effects of the present invention are:

1. The battery cell can be heated or cooled as needed, and only semiconductor refrigeration sheets are used as cold sources or heat sources, with a simple structure and low cost.

2. The battery cells are heated or cooled by heat exchange plates, and the heat exchange fluid is used for buffering and heat storage, thereby maintaining the stability of heating or cooling the battery cells.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

Fig. 1 is a schematic diagram of the structure of the present invention;

Fig. 2 is an exploded view of the present invention;

FIG. 3 is a schematic diagram of the circuit connection between a DC power supply and a semiconductor cooling sheet.

Detailed ways

In order to make the purpose, technical solutions and advantages of the invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.

Example 1

As shown in Figures 1 and 2, a battery pack structure for energy storage includes a pack body, which includes a lower box body 2, and an upper cover 1 is provided on the upper cover of the lower box body 2. A fan installation hole 10 for installing a fan and an air outlet 11 for exhausting air are formed at the bottom of the lower box body 2. A semiconductor cooling sheet 9 is installed in the lower box body 2, and a cavity is formed between the semiconductor cooling sheet 9 and the bottom surface of the lower box body 2. A heat exchange plate is installed above the semiconductor cooling sheet 9, and a battery cell group formed by multiple battery cells 4 is above the heat exchange plate.

The semiconductor cooling sheet 9 is electrically connected to the DC power supply 12 through the first closed circuit 13 and the second closed circuit 14. When the first closed circuit 13 and the second closed circuit 14 are turned on, the current in the semiconductor cooling sheet 9 flows in opposite directions, so that the cooling surface and the heating surface of the semiconductor cooling sheet 9 are reversed.

Specifically as shown in Figure 3, the first closed circuit 13 includes a first conductive wire 131 and a second conductive wire 132; one end of the first conductive wire 131 is electrically connected to the positive electrode of the semiconductor refrigeration plate 9, and the other end is electrically connected to the positive electrode of the DC power supply 12; one end of the second conductive wire 132 is electrically connected to the negative electrode of the semiconductor refrigeration plate 9, and the other end is electrically connected to the negative electrode of the DC power supply 12; a first switch 133 is installed on the first conductive wire 131 or the second conductive wire 132.

The second closed circuit 14 includes a third conductive wire 141 and a fourth conductive wire 142. One end of the third conductive wire 141 is electrically connected to the positive electrode of the semiconductor refrigeration plate 9, and the other end is electrically connected to the negative electrode of the DC power supply 12. One end of the fourth conductive wire 142 is electrically connected to the negative electrode of the semiconductor refrigeration plate 9, and the other end is electrically connected to the positive electrode of the DC power supply 12. A second switch 14 is installed on the third conductive wire 141 or the fourth conductive wire 142.

In this way, in a high temperature environment, when the battery cell needs to dissipate heat, the first switch 133 of the first closed circuit 13 is closed, so that the first closed circuit 13 is turned on. At this time, the top surface of the semiconductor cooling plate 9 is the cooling surface, and the bottom surface is the heating surface, so that the heat emitted by the battery cell is absorbed by the cooling surface through the heat exchange plate to cool the battery cell. In a low temperature environment, the first switch 133 is opened, the first closed circuit 13 is closed; the second switch 14 of the second closed circuit 14 is closed. At this time, since the current direction of the semiconductor cooling plate is opposite to that in a high temperature environment, the top surface is the heating surface, and the bottom surface is the cooling surface, so that the battery cell can be heated through the heat exchange plate.

Among them, as a further improvement, the heat exchange plate includes an upper plate 6 and a lower plate 8, a heat exchange liquid circuit is formed on the lower plate 8, and both ends of the heat exchange liquid circuit are respectively connected to the liquid inlet and the liquid outlet of the internal circulation pump 5. In this way, the heat exchange liquid flows through the circulation pump 5, so that the temperature of the heat exchange liquid is more uniform, and the temperature accumulation phenomenon is prevented.

The upper plate 6 is provided with a docking hole 7 for mounting the internal circulation pump 5.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims (6)

1. A battery pack structure for energy storage, comprising a pack body, wherein a battery cell group formed by a plurality of battery cells (4) is installed in the pack body; characterized in that a heat exchange plate is installed below the battery cell group, and the interior of the heat exchange plate is filled with heat exchange fluid; a semiconductor cooling sheet (9) is installed closely below the heat exchange plate; the semiconductor cooling sheet (9) is electrically connected to a DC power supply (12) through a first closed circuit (13) and a second closed circuit (14), respectively; wherein, when the first closed circuit (13) and the second closed circuit (14) are respectively turned on, the current directions in the semiconductor cooling sheet (9) are opposite. 2. The energy storage battery pack structure according to claim 1, characterized in that the first closed circuit (13) comprises a first conductive wire (131) and a second conductive wire (132); one end of the first conductive wire (131) is electrically connected to the positive electrode of the semiconductor refrigeration sheet (9), and the other end is electrically connected to the positive electrode of the DC power supply (12); one end of the second conductive wire (132) is electrically connected to the negative electrode of the semiconductor refrigeration sheet (9), and the other end is electrically connected to the negative electrode of the DC power supply (12); a first switch (133) is installed on the first conductive wire (131) or the second conductive wire (132); The second closed circuit (14) comprises a third conductive wire (141) and a fourth conductive wire (142); one end of the third conductive wire (141) is electrically connected to the positive electrode of the semiconductor refrigeration plate (9), and the other end is electrically connected to the negative electrode of the DC power supply (12); one end of the fourth conductive wire (142) is electrically connected to the negative electrode of the semiconductor refrigeration plate (9), and the other end is electrically connected to the positive electrode of the DC power supply (12); a second switch (143) is installed on the third conductive wire (141) or the fourth conductive wire (142). 3. The energy storage battery pack structure according to claim 1 is characterized in that the heat exchange plate includes an upper plate (6) and a lower plate (8), a heat exchange liquid circuit is formed on the lower plate (8), and both ends of the heat exchange liquid circuit are respectively connected to the liquid inlet and the liquid outlet of the internal circulation pump (5). 4. The energy storage battery pack structure according to claim 3, characterized in that a docking hole (7) for installing an internal circulation pump (5) is formed on the upper plate (6). 5. The energy storage battery pack structure according to claim 1, characterized in that the pack body comprises a lower box body (2), and an upper cover (1) is provided on the upper cover of the lower box body (2). 6. The energy storage battery pack structure as described in claim 5 is characterized in that a cavity is formed between the bottom surface of the lower box body (2) and the semiconductor refrigeration plate (9); in conjunction with the cavity, a fan mounting hole (10) for installing a fan and an air outlet (11) for exhausting air are formed on the lower box body (2).