Stationary power storage device

Abstract

The utility model provides a kind of fixed setting is used to store electricity device capable of constraining all-solid-state battery under high load.The fixed setting is used to store electricity device is arranged below building, with: all-solid-state battery, it is arranged between the pedestal of building;And elastomer, it is arranged between pedestal and all-solid-state battery, and all-solid-state battery is clamped between pedestal by elastomer.

Description

Technical Field

[0001] This disclosure relates to a fixed-installation energy storage device. Background Technology

[0002] Patent Document 1 discloses a fixed energy storage device installed under the floor of a building, which uses waste heat generated inside the building to keep the battery warm. The fixed energy storage device includes a storage box partially buried in the foundation with its portion exposed above the ground surface, and a battery housed inside the storage box.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2010 Announcement No. 192409.

[0004] However, when the battery is an all-solid-state battery, it needs to be constrained under high loads to suppress degradation. For stationary energy storage devices equipped with all-solid-state batteries, how to achieve high load levels of constraint forces acting on the batteries still requires further investigation. Utility Model Content

[0005] This disclosure is made in view of the above circumstances, and its purpose is to provide a fixed-installation energy storage device that can confine an all-solid-state battery under high load.

[0006] The fixed-installation energy storage device disclosed herein is installed below a building and includes: an all-solid-state battery disposed between the bases of the building; and an elastomer disposed between the bases and the all-solid-state battery, wherein the all-solid-state battery is held between the bases by the elastomer.

[0007] Preferably, the base may include a first base disposed above the all-solid-state battery and a second base disposed below the all-solid-state battery. The elastomer may include a first elastomer located between the upper surface of the all-solid-state battery and the first base, and a second elastomer located between the lower surface of the all-solid-state battery and the second base. The all-solid-state battery bears the load of the building from the first base through the first elastomer.

[0008] Preferably, the second base can be installed underground and in contact with the ground, and the all-solid-state battery can exchange heat with the second base through the second elastomer.

[0009] According to the fixed-installation energy storage device disclosed herein, an all-solid-state battery can be constrained under high loads. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a fixed-installation energy storage device in this embodiment.

[0011] Figure 2 This is a schematic diagram of an all-solid-state battery and an elastomer.

[0012] Figure 3 This is a diagram used to illustrate the structure of an all-solid-state battery and the structure of an elastomer.

[0013] Figure 4 This is a diagram used to illustrate the base. Detailed Implementation

[0014] The fixed-installation energy storage device in the embodiments of this disclosure will be described in detail below. However, this disclosure is not limited to the embodiments described below.

[0015] Figure 1 This is a schematic diagram of a fixed-installation energy storage device according to this embodiment. The fixed-installation energy storage device 1 includes an all-solid-state battery 2 and an elastic body 3. The fixed-installation energy storage device 1 is an energy storage system having multiple all-solid-state batteries 2, each of which is provided with an elastic body 3. The fixed-installation energy storage device 1 is installed below the building 10.

[0016] Building 10 is a building structure constructed on base 20. For example, building 10 can be a residential building or a warehouse. Base 20 is set on foundation 100 (see...). Figure 4 Above the solid-state battery 2, it is used to bear the load of the building 10. The base 20 includes a first base 21 located on the side of the building 10 and a second base 22 located on the side of the foundation 100. The first base 21 is an upper base disposed above the solid-state battery 2 and is integrally formed with the building 10. The second base 22 is a lower base disposed below the solid-state battery 2, buried underground, and its lower surface 22a is in contact with the foundation 100 (see See). Figure 4 It should be noted that, in this description, unless otherwise specified, the first base 21 and the second base 22 are collectively referred to as base 20.

[0017] like Figure 2 As shown, the all-solid-state battery 2 has a flat shell, and elastic bodies 3 are provided on both sides of the shell in the vertical direction. In the vertical direction, the all-solid-state battery 2 is sandwiched between the elastic bodies 3. Figure 3 As shown, the elastomer 3 includes a first elastomer 4 that contacts the upper surface 2a of the all-solid-state battery 2, and a second elastomer 5 that contacts the lower surface 2b of the all-solid-state battery 2. The casing of the all-solid-state battery 2 is made of aluminum.

[0018] The all-solid-state battery 2 includes a solid electrolyte with high ionic conductivity and a Si material. For example, the all-solid-state battery 2 is a high-capacity all-solid-state battery with a silicon anode. To ensure contact between the high-capacity all-solid-state battery 2 and the solid electrolyte, it needs to be constrained under high loads. Since the all-solid-state battery 2 using Si material is prone to expansion, if it is not constrained under higher loads when used as a stationary power source with a high number of cycles, a sharp capacity degradation may occur. Therefore, the all-solid-state battery 2 is configured as a battery cell that directly bears the load of the building 10. The stationary energy storage device 1 is an energy storage system using an all-solid-state battery that directly bears the load of the building 10. The load applied to the all-solid-state battery 2 is 1 MPa or more relative to the electrode area. The stationary energy storage device 1 has a structure in which the all-solid-state battery 2 is held between the base 20 by an elastic body 3. The weight of the building 10 and the first base 21 is 1 MPa or more per unit electrode area.

[0019] The elastomer 3 is a sheet-like elastic component formed along the surface of the all-solid-state battery 2. The elastomer 3 is disposed between the all-solid-state battery 2 and the base 20. The fixed-installation energy storage device 1 has a structure in which the elastomer 3 is located between the all-solid-state battery 2 and the base 20. The first elastomer 4 is an upper elastomer located between the upper surface 2a of the all-solid-state battery 2 and the first base 21. The second elastomer 5 is a lower elastomer located between the lower surface 2b of the all-solid-state battery 2 and the second base 22. The first elastomer 4 is located on the side of the building 10, and the second elastomer 5 is located on the side of the foundation 100. It should be noted that, in this description, unless specifically distinguished, the first elastomer 4 and the second elastomer 5 are collectively referred to as elastomer 3.

[0020] In the fixed-installation energy storage device 1, a waterproof treatment consisting of a waterproof component 30 is applied. For example... Figure 4 As shown, the waterproof component 30 is configured to cover the side of the all-solid-state battery 2 and is fixed to the base 20. The waterproof component 30 is a component used to waterproof the all-solid-state battery 2. The waterproof component 30 is fixed to the first base 21 and the second base 22 to cover the gap between the first base 21 and the second base 22. Since the solid electrolyte with high ionic conductivity is composed of sulfides, hydrogen sulfide is produced when it reacts with water. The all-solid-state battery 2 contains a solid electrolyte with high ionic conductivity. Therefore, in the fixed-installation energy storage device 1, the all-solid-state battery 2 is waterproofed by the waterproof component 30.

[0021] Furthermore, since the fixed-installation energy storage device 1 is an underground structure, even if the all-solid-state battery 2 accidentally leaks hydrogen sulfide, because hydrogen sulfide is denser than air, it will not flow to the ground but will remain underground, thus preventing harm to people on the ground. Therefore, a fixed-installation energy storage device 1 that is less harmful to humans, inexpensive, and highly safe can be provided.

[0022] Furthermore, in the fixed-installation energy storage device 1, since the all-solid-state battery 2 is in contact with the underground base 20 at a depth of 5m or less from the ground surface, the temperature of the all-solid-state battery 2 can be stabilized at approximately 15°C. In the fixed-installation energy storage device 1, the temperature range of the all-solid-state battery 2 is 5–25°C, more preferably a narrower range of 10–20°C. The all-solid-state battery 2 exchanges heat with the base 20 through the elastomer 3. Since the base 20 has a very large heat capacity, its temperature fluctuation is small, thus simplifying the cooling and heating system and keeping the temperature of the all-solid-state battery 2 within a stable range throughout the year. The base 20 includes a third base 23 whose side contacts the foundation 100. The third base 23 does not abut against the first base 21, but rather against the side 22b of the second base 22. This simplifies the control of systems such as protection against lithium deposition and heating protection during low-temperature charging of the all-solid-state battery 2.

[0023] To verify the durability of the all-solid-state battery 2, a cycle durability test was conducted on it. In this test, the constraint load and the number of cycles of the all-solid-state battery 2 were varied, and experimental results such as capacity retention and delamination between the solid electrolyte and the negative electrode were obtained.

[0024] In this experiment, to apply a constraint force (constraint load) to the all-solid-state battery 2, a pair of constraint plates clamped the all-solid-state battery 2 from both sides. These constraint plates were held in place by an elastic body 3. The constraint load (constraint pressure) of the all-solid-state battery 2 was set to three modes: 0.3 MPa, 1 MPa, and 5 MPa. The number of cycles was set to three modes: 10 cycles, 50 cycles, and 150 cycles. When the SOC of the all-solid-state battery 2 was subjected to CCCV charge-discharge cycles at a 1 / 3C rate within the range of 0–100%, its discharge capacity was measured. After 5 charge-discharge cycles and stabilization, the discharge capacity at that time was set to 1, and the trend of capacity retention was measured.

[0025] Experiments 1 through 7 were conducted under different experimental conditions. In Experiment 1, the constraint pressure was 0.3 MPa and the number of cycles was 10; in Experiment 2, the constraint pressure was 1 MPa and the number of cycles was 10; in Experiment 3, the constraint pressure was 0.3 MPa and the number of cycles was 50; in Experiment 4, the constraint pressure was 1 MPa and the number of cycles was 50; in Experiment 5, the constraint pressure was 0.3 MPa and the number of cycles was 150; in Experiment 6, the constraint pressure was 1 MPa and the number of cycles was 150; and in Experiment 7, the constraint pressure was 5 MPa and the number of cycles was 150.

[0026] Experimental results were obtained for each example. In the first example, the capacity retention rate was 97%, and no delamination occurred between the solid electrolyte and the negative electrode. In the second example, the capacity retention rate was 97%, and delamination also did not occur. In the third example, the capacity retention rate was 80%, and delamination between the solid electrolyte and the negative electrode occurred. In the fourth example, the capacity retention rate was 90%, and no delamination occurred. In the fifth example, the capacity retention rate decreased significantly, and delamination between the solid electrolyte and the negative electrode occurred. In the sixth example, the capacity retention rate was 78%, and no delamination occurred. In the seventh example, the capacity retention rate was 78%, and no delamination also occurred.

[0027] In the first and second experimental examples, there was no significant difference in capacity retention, and no interfacial delamination between the solid electrolyte and the negative electrode was observed. When the number of cycles reached 50, interfacial delamination occurred in the third experimental example with a confinement pressure of 0.3 MPa, and the capacity retention difference widened compared to the fourth experimental example with a confinement pressure of 1 MPa. When the number of cycles reached 150, the capacity retention in the fifth experimental example decreased significantly, confirming that it could no longer function as a battery. On the other hand, as shown in the sixth and seventh experimental examples, the all-solid-state battery 2 could still function normally when confined with a confinement pressure of 1 MPa or higher. Furthermore, no significant differences were observed between the sixth and seventh experimental examples in terms of capacity degradation and interfacial delamination.

[0028] As described above, according to this embodiment, since the all-solid-state battery 2 is capable of directly bearing the load of the building 10, the base 20 can constrain the all-solid-state battery 2 under high loads. Therefore, the degradation of the all-solid-state battery 2 can be suppressed.

[0029] Furthermore, by utilizing the load of building 10 to constrain the all-solid-state battery 2, the structure of the fixed-installation energy storage device 1 can be simplified. If an SUS (Steel Use Stainless) frame were used instead of an aluminum frame to constrain the all-solid-state battery 2 under high loads, the battery pack would become larger and heavier, and would create unused space underground.

[0030] In addition, since the fixed-installation energy storage device 1 is an underground storage structure, it can not only keep the temperature of the all-solid-state battery 2 stable, but also prevent human injury on the ground by trapping the hydrogen sulfide underground, even if hydrogen sulfide accidentally leaks from the all-solid-state battery 2.

Claims

1. A fixed-installation energy storage device, installed beneath a building, characterized in that, have: All-solid-state batteries, which are disposed between the bases of the building; and An elastomer is disposed between the base and the all-solid-state battery. The all-solid-state battery is held between the bases by the elastomer.

2. The fixed-installation energy storage device according to claim 1, characterized in that, The base includes a first base disposed above the all-solid-state battery and a second base disposed below the all-solid-state battery. The elastomer includes a first elastomer located between the upper surface of the all-solid-state battery and the first base, and a second elastomer located between the lower surface of the all-solid-state battery and the second base. The all-solid-state battery bears the load of the building from the first base through the first elastomer.

3. The fixed-installation energy storage device according to claim 2, characterized in that, The second base is disposed underground and in contact with the foundation, and the all-solid-state battery exchanges heat with the second base through the second elastomer.

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