KR-102962900-B1 - Battery Pack Comprising Temperature Control Device

Abstract

A battery pack according to the present invention comprises a battery cell stack including a plurality of battery cells, a temperature control element for controlling the temperature of the battery cell stack, a heat plate disposed between the battery cell stack and the temperature control element, a pack case housing the battery cell stack, the temperature control device and the heat plate inside, and a cooling fan for discharging heat inside the pack case to the outside, thereby maintaining the temperature inside the battery pack lower than the external temperature.

Inventors

• 구진우
• 최범
• 김희규
• 이창희

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260511

Application Date

20210615

Claims (12)

1. A battery cell stack comprising a plurality of battery cells; A temperature control element for preventing the temperature of the above battery cell stack from increasing due to an external high temperature; A heat plate disposed on the lower surface and side of the above-mentioned battery cell stack; A pack case that accommodates the above-mentioned battery cell stack, temperature control element, and heat plate inside; and A cooling fan that exhausts heat from inside the above pack case to the outside; Includes, The above battery cell stack is, When external power is supplied to an electrical device connected to a battery pack, current is not supplied to the electrical device, and when external power is not supplied to the electrical device, current is supplied to the electrical device. The heat plate includes a flat portion located on the lower surface of the battery cell stack and a side portion located between the battery cell stack and the temperature control element. The above heat plate has a space formed inside, and The above space contains a refrigerant that flows according to temperature, and A battery pack for an emergency power supply, wherein the above refrigerant is vaporized by the heat of the battery cell stack and rises along the side portion, and the rising refrigerant is cooled by the temperature control element and descends to move along the planar portion, thereby forming a circulation.
2. In paragraph 1, the cooling fan is positioned at one of the two ends in the long axis direction of the pack case, and The above temperature control element is a battery pack for an emergency power supply located between the above battery cell stack and the above cooling fan.
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6. In paragraph 1, The above temperature control element is a Peltier element, a battery pack for an emergency power supply.
7. A battery pack for an emergency power supply according to claim 1, wherein a heat sink is disposed between the temperature control element and the cooling fan.
8. A battery pack for an emergency power supply according to claim 1, wherein a heat dissipation member is located between the battery cell stack and the planar portion.
9. A battery pack for an emergency power supply according to claim 1, wherein an insulating material is further added to at least a portion of the outer surface of the battery cell stack.
10. A battery pack for an emergency power supply, wherein, in paragraph 1, an insulating material is further added to the outer surface of the flat portion.
11. In paragraph 1, the electrical device is a battery pack for an emergency power supply, which is a computer server system.
12. In claim 11, a battery pack for an emergency power supply in which the temperature of the battery cell stack is maintained at a lower state than the temperature of the computer server system.

Description

Battery Pack Comprising Temperature Control Device The present invention relates to a battery pack including a temperature control device. Specifically, it relates to a battery pack including a temperature control device capable of maintaining an internal temperature lower than the external temperature. Facilities are emerging that build Internet data centers to store the rapidly increasing variety of data accompanying the expansion of internet-based businesses, and commercialize the storage and management of corporate computer servers or the leasing of servers. Internet data centers must operate 24 hours a day and ensure that internet access is available at all times, so they are equipped with emergency power supply devices to provide emergency power even in the event of a power outage. Generally, emergency power supplies are installed together with computer server systems in a server room. Since the temperature inside the server room increases due to the heat generated by the computer server systems, the battery packs included in the emergency power supply may be exposed to a high-temperature environment. The battery pack included in the above emergency power supply is stored in a fully charged state, but a problem arises where its lifespan deteriorates rapidly if the temperature increases. Therefore, technology is required to prevent the rapid deterioration of the battery pack's lifespan by controlling the internal temperature of the battery pack for emergency power supply units exposed to high-temperature environments so that it does not rise. In this regard, Patent Document 1 relates to an energy storage device comprising a cooling device for cooling a battery pack by circulating air inside a housing, wherein the cooling device comprises a Peltier element in which a heat absorption portion is positioned toward the inside of the housing and a heat generation portion is positioned toward the outside of the housing, a first heat sink positioned at the heat absorption portion of the Peltier element and a first cooling fan for circulating cooled internal air, and a second heat sink positioned at the heat generation portion of the Peltier element and a second cooling fan for cooling the heat generation portion by circulating external air, wherein when the temperature of the battery pack becomes above a set temperature and the control unit operates the first cooling fan, the internal air of the housing, which is cooled while passing through the first heat sink, passes through an air circulation passage between the batteries and directly cools the battery cells. The battery pack of Patent Document 1 has a structure in which cooled air circulates inside the housing to directly cool the battery cells, but there is a problem that the energy density of the battery pack is low because the volume of the cooling device including two heat sinks and two cooling fans is large. In addition, since the insulating material is installed only on the outer surface of the Peltier element, the structure is such that the temperature of the outer surface of the housing is easily transferred into the interior of the housing in the parts where the insulating material is not placed. Patent Document 2 relates to a battery module comprising a thermoelectric element and a heat dissipation member for cooling the battery module, wherein the heat dissipation member comprises cooling fins interposed at the interface of battery cells and a heat dissipation plate having one end of the cooling fins in contact with one side of the plate and a thermoelectric element attached to the other side, and heat conducted from the battery cells to the heat dissipation member is conducted to the thermoelectric element and cooled. Patent Document 2 is a form in which the heat of the battery cell can be lowered by a conduction method by arranging the heat dissipation member and the thermoelectric element in direct contact with the battery cell stack, but it does not include a structure for discharging heat inside the battery module to the outside, and thus does not have a structure that can maintain the temperature inside the battery module lower than the external temperature. As such, there is a high need for technology that can prevent the deterioration of battery pack lifespan by minimizing the temperature increase of battery packs placed in high-temperature environments. FIG. 1 is an exploded view of a battery pack according to the present invention. Figure 2 is a schematic diagram showing the movement of heat from a computer server system and a battery pack placed in a computer server room. Figure 3 is a perspective view of some components of the battery pack of Figure 1. Figure 4 is a side view of some components of the battery pack of Figure 1. Figure 5 shows the heat transfer inside the heat plate. Embodiments that enable a person skilled in the art to easily practice the present invention are described in detail below with reference to the attached