Anti-circulation device of energy storage system

Abstract

The utility model discloses an anti-circulation device of an energy storage system, which is characterized in that two groups of switch modules are arranged on the upper surface of a shell, and each switch module consists of a main switch and a branch switch, so that the two groups of switch modules control charging and discharging of a lithium battery, and mutual influence of a charging circuit and a discharging circuit is avoided; and the main switch is used for controlling the branch switches to be connected with the lithium batteries, so that current circulation caused by parallel connection among multiple groups of lithium batteries is avoided, and the problem of circulation caused by internal resistance change of the lithium batteries in a parallel circuit is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to an anti-circulation device for an energy storage system. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and uses non-aqueous electrolyte solutions. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain metallic lithium and are rechargeable.

[0003] However, during the use of lithium batteries, since lithium battery packs are often connected in parallel for use, when the internal resistance of the lithium battery changes, the electromotive force also changes. At this time, the battery pack with a large electromotive force will discharge to the battery pack with a small electromotive force, forming a circulation current between the parallel battery packs. The circulation current will cause the lithium battery to generate heat due to work done by the internal resistance, resulting in energy loss. At the same time, lithium batteries will also generate heat during the charging and discharging process. If the heat dissipation is insufficient, it will easily cause the problem of heat accumulation in the lithium battery. Utility Model Content

[0004] The purpose of the utility model is to disclose an anti-circulation device for an energy storage system in view of the technical defects existing in the prior art.

[0005] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is:

[0006] A device for preventing circulation of an energy storage system comprises a shell, a plurality of lithium batteries are installed inside the shell, two groups of switch modules are installed on the surface of the shell, the plurality of lithium batteries are electrically connected to the switch modules, heat-conducting aluminum plates are arranged on both sides of the lithium batteries, connecting aluminum plates are connected at both ends of the heat-conducting aluminum plates, the connecting aluminum plates are installed on both sides of the inner wall of the shell, a plurality of heat-dissipating aluminum plates are installed on the outer side walls of the connecting aluminum plates, an air intake pipe is installed at the end of the heat-dissipating aluminum plate, and a fan is installed in the air intake pipe; a raised portion with the same spacing and in contact with the outer surface of the lithium battery is integrally formed on the inner side of the heat-conducting aluminum plate.

[0007] Furthermore, the switch module includes a main switch and a branch switch, and the lithium battery is electrically connected to the main switch via the branch switch.

[0008] Furthermore, the lithium batteries are divided into five groups, each group of lithium batteries has ten lithium batteries connected in series, and each group of lithium batteries is equipped with a branch switch.

[0009] Furthermore, a foam support plate is provided at the bottom of the heat-conducting aluminum plate.

[0010] Furthermore, the intervals between the plurality of heat dissipation aluminum plates are the same.

[0011] Furthermore, a protective net is installed at the front end of the fan.

[0012] Compared with the prior art, the advantages of the utility model are:

[0013] Two groups of switch modules are installed on the upper surface of the shell, and the switch module consists of a main switch and a branch switch, so that the two groups of switch modules control the charging and discharging of the lithium battery to avoid mutual influence of the charging and discharging circuits. The main switch is used to control the branch switch to be connected to the lithium battery, so as to avoid current circulation between multiple groups of lithium batteries due to parallel connection, and solve the problem of circulation of lithium batteries in parallel circuits due to internal resistance changes. The shell is provided with a heat dissipation mechanism for heat dissipation of the lithium battery, and the heat dissipation mechanism consists of a heat-conducting aluminum plate, a connecting aluminum plate, a heat dissipation aluminum plate, an air intake pipe, a fan and a protective net. The heat-conducting aluminum plate is in contact with the outer surface of the lithium battery, so that the heat on the surface of the lithium battery is transferred to the connecting aluminum plate through the heat-conducting aluminum plate. The fan increases the air flow rate on the surface of the connecting aluminum plate and the heat dissipation aluminum plate, so that the heat of the connecting aluminum plate and the heat dissipation aluminum plate is diffused into the air, thereby realizing the heat dissipation of the connecting aluminum plate and the heat dissipation aluminum plate, and achieving the purpose of heat dissipation of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of a half-section structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the heat-conducting aluminum plate structure in the utility model;

[0018] Figure 5 This is a schematic diagram of the heat dissipation module structure in the utility model;

[0019] In the figure: 1. Shell; 2. Lithium battery; 3. Switch module; 31. Main switch; 32. Branch switch; 4. Heat-conducting aluminum plate; 41. Raised part; 5. Connecting aluminum plate; 6. Heat-dissipating aluminum plate; 7. Inlet pipe; 8. Fan; 9. Protective net; 10. Foam support plate. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Example 1

[0022] See also Figure 1-5The utility model provides a technical solution: an energy storage system anti-circulation device, comprising a housing 1, and a lithium battery 2 arranged in the housing 1, two sets of switch modules 3 for charging and discharging are installed on the upper surface of the housing 1, the switch module 3 comprises a main switch 31 and a branch switch 32, and the lithium battery 2 is connected to the main switch 31 through the branch switch 32;

[0023] The shell 1 is also provided with a heat dissipation mechanism for dissipating heat from the lithium battery 2. The heat dissipation mechanism includes a heat-conducting aluminum plate 4 arranged on the outside of the shell 1, and connecting aluminum plates 5 welded at both ends of the heat-conducting aluminum plate 4, and the two connecting aluminum plates 5 are located at both ends of the shell 1. A heat-dissipating aluminum plate 6 is welded on the outer surface of the connecting aluminum plate 5, and an air intake pipe 7 is welded on the end of the heat-dissipating aluminum plate 6. A fan 8 is installed in the air intake pipe 7, and a protective net 9 for protecting the fan 8 is installed at the end of the air intake pipe 7.

[0024] In this embodiment, two groups of switch modules 3 are installed on the upper surface of the shell 1, and the switch module 3 is composed of a main switch 31 and a branch switch 32, so that the two groups of switch modules 3 control the charging and discharging of the lithium battery 2 to avoid mutual influence between the charging and discharging circuits, and the main switch 31 is used to control the branch switch 32 to be connected to the lithium battery 2, thereby avoiding the current circulation between multiple groups of lithium batteries 2 due to parallel connection, and solves the problem of circulation of lithium batteries 2 due to internal resistance change in the parallel circuit, and the shell 1 is provided with a heat dissipation mechanism for dissipating heat of the lithium battery 2, and the heat dissipation mechanism is composed of a heat-conducting aluminum plate 4, a connecting aluminum plate 5, a heat dissipation aluminum plate 6, an air intake pipe 7, a fan 8 and a protective net 9, and the heat-conducting aluminum plate 4 is in contact with the outer surface of the lithium battery 2, so that the heat on the surface of the lithium battery 2 is transferred to the connecting aluminum plate 5 through the heat-conducting aluminum plate 4, and the fan 8 increases the air flow rate on the surface of the connecting aluminum plate 5 and the heat dissipation aluminum plate 6, so that the heat of the connecting aluminum plate 5 and the heat dissipation aluminum plate 6 is diffused into the air, and the heat dissipation of the connecting aluminum plate 5 and the heat dissipation aluminum plate 6 is realized, so as to achieve the purpose of heat dissipation of the lithium battery 2.

[0025] Specifically, the lithium batteries 2 are divided into five groups, and each group of lithium batteries 2 has ten lithium batteries 2 connected in series, and five groups of lithium batteries 2 correspond to five branch switches 32 .

[0026] Specifically, a convex portion 41 that fits with the outer surface of the lithium battery 2 is integrally formed on the inner side of the heat-conducting aluminum plate 4 , and the convex portions 41 are distributed at equal intervals.

[0027] Specifically, a foam support plate 10 for supporting the heat-conducting aluminum plate 4 is further provided in the housing 1 , and six foam support plates 10 are arranged at equal intervals.

[0028] Specifically, the heat dissipation aluminum plates 6 welded on the surface of the connecting aluminum plate 5 are distributed at equal intervals, and three air inlet pipes 7 are welded to the connecting aluminum plate 5 through the heat dissipation aluminum plate 6 .

[0029] The working principle and use process of the utility model are as follows: when in use, five groups of lithium batteries 2 are connected in series and then connected to the main switch 31 through the branch switch 32, so that the five groups of lithium batteries 2 are connected in parallel through the switch module 3. When the fan 8 is electrically connected to the lithium battery 2, the fan 8 makes the air inside the air intake pipe 7 blow toward the connecting aluminum plate 5 and the heat dissipation aluminum plate 6. At this time, the heat on the surfaces of the connecting aluminum plate 5 and the heat dissipation aluminum plate 6 is transferred to the air, and the heat on the surface of the lithium battery 2 is transferred to the connecting aluminum plate 5 through the heat-conducting aluminum plate 4, thereby achieving the purpose of dissipating heat and cooling the lithium battery 2.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An anti-circulation device for an energy storage system, comprising a housing (1), characterized in that: A plurality of lithium batteries (2) are installed inside the shell (1), two groups of switch modules (3) are installed on the surface of the shell (1), and the plurality of lithium batteries (2) are electrically connected to the switch modules (3). Heat-conducting aluminum plates (4) are arranged on both sides of the lithium batteries (2), and connecting aluminum plates (5) are connected to both ends of the heat-conducting aluminum plates (4). The connecting aluminum plates (5) are installed on both sides of the inner wall of the shell (1), and a plurality of heat-dissipating aluminum plates (6) are installed on the outer wall of the connecting aluminum plates (5). An air intake pipe (7) is installed at the end of the heat-dissipating aluminum plate (6), and a fan (8) is installed in the air intake pipe (7); a protrusion with the same spacing and in contact with the outer surface of the lithium battery (2) is integrally formed on the inner side of the heat-conducting aluminum plate (4).

2. The energy storage system anti-circulation device according to claim 1, characterized in that: The switch module (3) comprises a main switch (31) and a branch switch (32), and the lithium battery (2) is electrically connected to the main switch (31) via the branch switch (32).

3. The energy storage system anti-circulation device according to claim 2, characterized in that: The lithium batteries (2) are divided into five groups, each group of lithium batteries (2) is provided with ten lithium batteries (2) connected in series, and each group of lithium batteries (2) is equipped with a branch switch (32).

4. The energy storage system anti-circulation device according to claim 1, characterized in that: A foaming support plate (10) is arranged at the bottom of the heat-conducting aluminum plate (4).

5. The energy storage system anti-circulation device according to claim 1, characterized in that: The plurality of heat dissipation aluminum plates (6) are spaced at the same intervals.

6. The energy storage system anti-circulation device according to claim 1, characterized in that: A protective net (9) is installed at the front end of the fan (8).

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