JP5056558B2 - All-solid lithium secondary battery - Google Patents

Description

  The present invention relates to an all-solid lithium secondary battery with improved safety when subjected to external impacts.

  With the rapid spread of information-related equipment and communication equipment such as personal computers, video cameras, and mobile phones in recent years, the development of secondary batteries that are excellent as power sources, such as lithium secondary batteries, has been regarded as important. In fields other than the information-related equipment and communication-related equipment, for example, in the automobile industry, the development of high-power and high-capacity lithium secondary batteries for electric vehicles and hybrid vehicles as low-emission vehicles has been promoted. ing.

  However, the lithium secondary batteries currently on the market use an organic electrolyte that uses a flammable organic solvent as a solvent.・ Improved materials are necessary.

  In contrast, an all-solid lithium secondary battery in which the liquid electrolyte is changed to a solid electrolyte to make the battery all solid does not use a flammable organic solvent in the battery, so the safety device can be simplified and manufactured. It is considered to be excellent in cost and productivity.

  However, safety measures for all-solid-state lithium secondary batteries are still inadequate.For example, accidental short-circuiting or discharging may occur due to difficulty in battery control due to external impacts. Further improvements are needed to prevent these.

On the other hand, in the lithium secondary battery using the liquid electrolyte described above, safety measures at the time of overcharging or short circuit are being studied. For example, Patent Document 1 discloses a thin film battery in which electrode terminals and current collecting tabs are stacked and connected in a contact state without being fixed so that current can be reliably interrupted during overcharge or short circuit. This is because when the internal pressure rises due to overvoltage or the like, the contact of the connecting portion is cut off, and the rise of the internal pressure can be suppressed.
However, since the liquid electrolyte is used, it is necessary to provide a contact blocking part in the battery in order to reliably cut off the current, and there is a problem that the manufacturing becomes complicated. In addition, it is difficult to cut off the current when it is difficult to control the battery due to external impact and the battery is damaged, etc., preventing accidental short circuit, discharge, etc. There was a problem that it was difficult.

JP 2001-68090 A JP-A-8-83596 JP-A-61-135048

  The present invention has been made in view of the above problems, and a main object of the present invention is to provide an all-solid lithium secondary battery with improved safety when subjected to an external impact.

  In order to achieve the above object, in the present invention, an upper current collector fixed to a lower part of a structure, a lower current collector supported by a pressing force pressed upward by a safety mechanism, and the upper current collector An all-solid lithium secondary battery element including a power generation element sandwiched between a body and the lower current collector, and the safety mechanism, wherein the safety mechanism is externally provided. When the impact is applied, the pressing force is released, the lower current collector moves downward due to gravity, and between the upper current collector and the power generation element, in the power generation element, or An all-solid lithium secondary battery is provided that has a structure separated at any position between a lower current collector and the power generation element.

  According to the present invention, when receiving an impact from the outside, the pressing force of the safety mechanism is released, and the lower current collector moves downward due to gravity, whereby the upper current collector and the It can be separated from the power generation element, in the power generation element, or at any position between the lower current collector and the power generation element (hereinafter sometimes referred to as a separable position). Charging / discharging stops. Thereby, safety can be improved.

  In the above invention, the safety mechanism is a flexible vacuum sealed package, and the all solid lithium secondary battery element is installed inside the vacuum sealed package, and the interior of the vacuum sealed package is decompressed and sealed. Accordingly, it is preferable that the pressing force is generated and the lower current collector is pressed upward to be supported. This is because the structure of the safety mechanism is simple and the pressing force can be easily generated. Further, when receiving an impact from the outside, the support by the pressing force can be easily released and separation can be performed at the separable position.

  In the above invention, the all solid lithium secondary battery element and the vacuum sealed package are installed inside the pressure sealed package, and the space between the vacuum sealed package and the pressure sealed package is pressurized and sealed. It is preferable to do. This is because the pressing force can be generated more effectively and the lower current collector can be pressed upward and supported.

  Further, in the present invention, an all-solid lithium secondary battery mounting structure having a structure and an all-solid lithium secondary battery, wherein the all-solid lithium secondary battery is fixed to the lower part of the structure An all solid including a current collector, a lower current collector supported by a pressing force pressed upward by a safety mechanism, and a power generation element sandwiched between the upper current collector and the lower current collector A lithium secondary battery element and the safety mechanism, the safety mechanism is released when the impact is applied from the outside, the pressing force is released, the lower current collector is moved downward by gravity, An all-solid lithium secondary battery mounting structure characterized by having a structure that is separated at the separable position.

  According to the present invention, when the impact from the outside is received, the pressing force of the safety mechanism is released, and the lower current collector is moved downward by gravity to be separated at the separable position. Therefore, charging / discharging stops. Thereby, safety can be improved.

  In this invention, there exists an effect that the all-solid-state lithium secondary battery which improved the safety | security at the time of receiving the impact from the outside can be obtained.

  The all solid lithium secondary battery and the all solid lithium secondary battery mounting structure of the present invention will be described in detail below.

A. All-solid lithium secondary battery First, the all-solid lithium secondary battery of the present invention will be described in detail below.
An all-solid lithium secondary battery of the present invention includes an upper current collector fixed to a lower portion of a structure, a lower current collector supported by a pressing force pressed upward by a safety mechanism, and the upper current collector, An all-solid lithium secondary battery having an all-solid-state lithium secondary battery element including a power generation element sandwiched between the lower current collector and the safety mechanism, wherein the safety mechanism has an impact from the outside In this case, the pressing force is released and the lower current collector moves downward due to gravity and is separated at the separable position.

According to the present invention, when the impact from the outside is received, the pressing force of the safety mechanism is released, and the lower current collector is moved downward by gravity to be separated at the separable position. Therefore, charging / discharging stops. Thereby, safety can be improved.
That is, in the all-solid lithium secondary battery of the present invention, the above-described separable positions separated as described above are merely brought into contact with each other without sticking the solids to each other. Therefore, the pressing force of the safety mechanism is released, and the lower current collector moves downward due to gravity, so that it can be easily separated to stop charging / discharging.
Furthermore, since it is easily separable as described above, there is a need to provide a contact blocking part or the like formed in the battery, which is necessary to prevent contact with an adhesive liquid as in the case of using a liquid electrolyte. Absent. Therefore, safety can be improved by a more simplified battery structure.

Hereinafter, the all solid lithium secondary battery of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view schematically showing an example of the all solid lithium secondary battery of the present invention. The all-solid lithium secondary battery shown in FIG. 1 includes an upper current collector 1 fixed to the lower part of the structure 10, a lower current collector 2 supported by a pressing force that is pressed upward by a safety mechanism 5a, It has an all-solid-state lithium secondary battery element 4 including a power generation element 3 sandwiched between an upper current collector 1 and a lower current collector 2, and the safety mechanism 5a. Electricity is taken out by the lead wire 6 connected to the upper current collector 1 and the lower current collector 2. Here, in the power generation element 3, as shown in FIG. 1, the solid electrolyte layer 7 is usually held between the positive electrode layer 8 and the negative electrode layer 9.
The all solid lithium secondary battery of the present invention is not particularly limited as long as it has at least the all solid lithium secondary battery element and the safety mechanism.
Hereinafter, the all solid lithium secondary battery of the present invention will be described in detail for each configuration.

1. First, the safety mechanism used in the present invention will be described. The safety mechanism in the present invention generates a pressing force that presses the lower current collector upward, and supports the lower current collector by this pressing force. The pressing force of the safety mechanism can be released.
In the present invention, by having such a safety mechanism, when receiving an impact from the outside, the pressing force is released, and the lower current collector can move downward due to gravity, It isolate | separates in the said separable position. For this reason, it becomes possible to stop charging / discharging and the like, and safety can be improved.

  In the present invention, the state in which the safety mechanism is supported by the pressing force pressing upward means that, as illustrated in FIG. 1, the pressing force causes the upper current collector and the power generating element to It is not separated at any position in the power generation element or between the lower current collector and the power generation element, and is normally in a chargeable / dischargeable state. Further, the state after the pressing force by the safety mechanism is released is a state where the lower current collector is moved downward by gravity and the separable position is separated, and normally charging and discharging are impossible. It is. For example, the state is as shown in FIG.

As the safety mechanism, when the upper current collector is pressed upward by the lower current collector, the lower current collector is supported by the pressing force and subjected to an external impact. In addition, there is no particular limitation as long as the pressing force can be released.
Specifically, when the pressing force is generated by mechanical stress, thereby supporting the lower current collector and receiving an impact from the outside, the magnitude of the impact becomes a predetermined specified value. If it exceeds, the device that releases the pressing force is activated, the safety force can be released by releasing the pressing force and moving the position downward due to gravity, etc. it can. For example, as shown in FIG. 1 described above, a flat plate (safety mechanism 5a) that supports the entire lower surface of the lower current collector 2 can be used. In addition to the flat plate-shaped one, a safety mechanism or the like that partially supports the lower portion of the lower current collector may be used.

  Further, in the present invention, when the impact is applied from the outside, the safety mechanism is directly damaged due to the impact of the impact, such as removal of the flat plate that generates a pressing force due to mechanical stress. Even if it exists, the said pressing force is cancelled | released and the said lower electrical power collector can be moved below with gravity.

  In the present invention, as a material used for the safety mechanism that generates the pressing force by mechanical stress, an all-solid lithium secondary battery that generates the pressing force and is supported by the pressing force has desired battery characteristics. It is possible to charge / discharge with an external shock, and when it receives an impact from the outside, the support by the pressing force is released, and charging / discharging can be stopped. It is not limited.

  In addition, when a pressing force that presses upward by atmospheric pressure is generated, thereby supporting the lower current collector and receiving an external impact, the impact exceeds a predetermined specified value. The device for releasing the pressing force is activated, and a safety mechanism that can release the pressing force due to atmospheric pressure by opening a hole in the vacuum sealed package or breaking the vacuum sealed package can be cited. . For example, as shown in the schematic cross-sectional view of the all-solid lithium secondary battery in FIG. 3, the all-solid lithium secondary battery element 4 is included, the inside thereof is decompressed, and the lower current collector is supported by atmospheric pressure. A flexible vacuum sealed package (safety mechanism 5b) that can be used.

  Further, in the present invention, when the external safety mechanism is directly damaged due to, for example, breaking the decompression sealed package or the like that generates a pressing force due to atmospheric pressure or the like when receiving an external impact. Even so, the pressing force is released, and the lower current collector can be moved downward by gravity.

  The flexible vacuum-sealed package used as the safety mechanism has flexibility, and as described above, the pressure is reduced by reducing the inside of the package, and is supported by the pressure. The all-solid-state lithium secondary battery can be charged / discharged with the desired battery characteristics, and when subjected to external impact, the support by the pressing force is released and the charging / discharging is stopped. There is no particular limitation as long as it can be performed. Specifically, the bag-like thing etc. which were formed with the plastic film which has airtightness can be mentioned.

  In the present invention, a safety mechanism using a pressing force by atmospheric pressure is particularly preferable. This is because the structure of the support can be simplified and the pressing force can be easily generated. In addition, when receiving an impact from the outside, the support by the pressing force can be released by using an easy method such as opening a hole in the vacuum sealed package.

In the present invention, when the safety mechanism is a flexible vacuum sealed package, a pressure sealed package is prepared as another safety mechanism. For example, the all-solid lithium secondary battery of FIG. As shown in the schematic cross-sectional view, the all-solid lithium secondary battery element 4 illustrated in FIG. 3 and the vacuum sealed package (safety mechanism 5b) are installed inside the pressurized sealed package (safety mechanism 5c). Then, it is preferable to pressurize and seal the space between the vacuum sealed package and the pressure sealed package. For example, even when a heavier all-solid lithium secondary battery element is used, the pressing force can be generated more effectively, such as a sufficient pressing force can be generated and supported.
In such a case, when an impact from the outside is received, if the impact exceeds a predetermined specified value, the device for releasing the pressing force is activated, and a pressure sealed package, and further if necessary The pressing force is released by, for example, opening a hole in the vacuum sealed package, and the lower current collector moves downward due to gravity. Thereby, it can isolate | separate in the said separable position.

  As the pressurized sealed package used as the safety mechanism, an all-solid lithium secondary battery supported by the pressing force is generated by pressurizing the inside thereof as described above. It is possible to charge / discharge with battery characteristics, and when it receives impact from the outside, the support by the pressing force is released and charging / discharging can be stopped. Although not particularly limited, there may be mentioned a bag-like one formed of a plastic film having airtightness. This is because it is easy to open or break a hole and easily release the pressing force.

2. Next, the all solid lithium secondary battery element in the present invention will be described. As described above, the all-solid-state lithium secondary battery element in the present invention is normally supported by the pressing force of the safety mechanism that presses the lower current collector upward, and receives an impact from the outside. At this time, when the pressing force by the safety mechanism is released, the lower current collector can be moved downward by gravity and separated at the separable position.
In the present invention, by having such an all-solid lithium secondary battery element, it is possible to stop charging and discharging when receiving an impact from the outside, and to improve safety.

  The all solid lithium secondary battery element in the present invention is not particularly limited as long as it has at least the upper current collector, the lower current collector, and the power generation element. Hereinafter, the all solid lithium secondary battery element in the present invention will be described in detail for each configuration.

(1) Upper current collector The upper current collector used in the present invention is fixed to the lower part of the structure, and collects current from a positive electrode layer or a negative electrode layer, which will be described later.
In the present invention, the upper current collector is fixed to the lower part of the structure. For this reason, it can be pressed upward by a lower current collector, which will be described later, and when the impact from the outside is received, the pressing force by the safety mechanism is released, and the lower current collector, which will be described later. When the electric body moves downward due to gravity, it can be separated at the separable position.

  The current collector material used for the upper current collector is not particularly limited as long as it has conductivity, but for example, copper, stainless steel, nickel aluminum, SUS, nickel, iron And titanium. Further, the upper current collector may be a dense current collector or a porous current collector.

  In the present invention, as described above, when the external impact is received, the separation is performed at the separable position. That is, the upper current collector and the power generation element described later must be separable if there is no other position in the all solid lithium secondary battery element that can be separated. If there are other positions in the all-solid-state lithium secondary battery element that can be separated, they may be separable or may not be separable.

(2) Lower current collector The lower current collector in the present invention is supported by an upward pressing force generated by the safety mechanism, and when the external impact is received, the pressing force of the safety mechanism is released, It can move downward due to gravity, and collects current from a positive electrode layer or a negative electrode layer, which will be described later.
For this reason, it is possible to press the upper current collector and the power generation element upward by the pressing force generated by the safety mechanism, and when receiving an impact from the outside, the pressing force by the safety mechanism Is released, it moves downward by gravity, and can be separated at the separable position.

  The lower current collector is the same as that described in “A. All-solid lithium secondary battery 2. All-solid lithium secondary battery element (1) Upper current collector”. Description of is omitted.

  In the present invention, as described above, when the external impact is received, the separation is performed at the separable position. That is, the lower current collector and the power generation element described later must be separable if there is no other position in the all solid lithium secondary battery element that can be separated. If there are other positions in the all-solid-state lithium secondary battery element that can be separated, they may be separable or may not be separable.

  Further, in the present invention, the lower current collector can be moved downward by gravity, so that it can be separated at the separable position, but there is a possibility that it may not be separated. The lower current collector may have a weight or the like for easy separation.

(3) Power Generation Element The power generation element in the present invention is sandwiched and held between the upper current collector and the lower current collector, and is interposed between the positive electrode layer, the negative electrode layer, the positive electrode layer, and the negative electrode layer. And a sandwiched solid electrolyte layer.
In the present invention, the power generating element is sandwiched and held by the upper current collector and the lower current collector, receives an impact from the outside, and when the pressing force of the safety mechanism is released, If necessary, all of the power generation elements or a part of the power generation elements can be moved downward by gravity. In addition, when all the power generation elements are firmly pressed and fixed to the upper current collector, the power generation elements and the lower current collector can be separated. For this reason, when receiving an impact from outside, the pressing force by the safety mechanism is released, and the lower current collector can be moved downward by gravity. It can be separated.

  In the present invention, as described above, when the external impact is received, the separation is performed at the separable position. That is, if there is no position that can be separated in the all-solid lithium secondary battery element other than the later-described positive electrode layer, negative electrode layer, and solid electrolyte layer in the power generation element, at least It is necessary to be able to separate one of the layers in the power generation element. In addition to the layers in the power generation element, there are positions in the all solid lithium secondary battery element that can be separated. If present, the power generating element may or may not have a separable portion.

  Such a power generation element in the present invention is not particularly limited as long as it has at least the positive electrode layer, the negative electrode layer, and the solid electrolyte layer. Hereinafter, the power generation element in the present invention will be described in detail for each configuration.

(A) Positive electrode layer The positive electrode layer used in the present invention is not particularly limited as long as it has a function as a positive electrode layer and can form the desired all-solid lithium secondary battery. It may be composed of only a positive electrode material, or may be composed of a mixture for positive electrode in which a positive electrode material and a solid electrolyte material are mixed, and is used for a general all-solid lithium secondary battery The same can be used. Moreover, in order to improve electroconductivity, you may contain conductive support agents, such as acetylene black, ketjen black, and carbon fiber.

  The film thickness of the positive electrode layer is not particularly limited, and a film having a thickness similar to that of the positive electrode layer used in a normal all-solid lithium secondary battery can be used.

(B) Negative electrode layer The negative electrode layer used in the present invention is not particularly limited as long as it has a function as a negative electrode layer and can form the desired all-solid lithium secondary battery. . As the negative electrode material used for the negative electrode layer, the same materials as those used for a general all solid lithium secondary battery can be used. Examples thereof include those made only of a negative electrode material such as a metal foil having a function as a negative electrode, and those obtained by mixing a negative electrode active material and a solid electrolyte material into a mixture for a negative electrode. Moreover, in order to improve electroconductivity as needed, you may contain conductive support agents, such as acetylene black, ketjen black, and carbon fiber.

  The film thickness of the negative electrode layer is not particularly limited, and a film having a thickness similar to that of the negative electrode layer used in a normal all solid lithium secondary battery can be used.

(C) Solid electrolyte layer The solid electrolyte layer used in the present invention is particularly limited as long as it has a function as a solid electrolyte layer and can form the desired all-solid lithium secondary battery. It is not a thing. The solid electrolyte material used for the solid electrolyte layer is not particularly limited as long as it has a function as a solid electrolyte material, and is the same as that used for a general all-solid lithium secondary battery. Things can be used. For example, a sulfide-based solid electrolyte material, thiolysicon, an oxide-based solid electrolyte material, and the like can be given. Among them, a sulfide-based solid electrolyte material is preferable. This is because the sulfide-based solid electrolyte material exhibits high ionic conductivity, and thus can increase the output.

  The film thickness of the solid electrolyte layer is not particularly limited, and a film having the same thickness as that of a solid electrolyte layer used in a normal all-solid lithium secondary battery can be used.

(D) Others In the present invention, as illustrated in FIG. 1, the power generation element is arranged such that the positive electrode layer is in contact with the upper current collector and the negative electrode layer is in contact with the lower current collector. The upper current collector may be held between the current collector and the lower current collector, and the upper current collector is disposed such that the negative electrode layer is in contact with the upper current collector and the positive electrode layer is in contact with the lower current collector. Further, it may be held between the lower current collector.
(4) Others In the all solid lithium secondary battery element in the present invention, the power generation element and the intermediate current collector installed between the power generation elements are alternately laminated a predetermined number of times, etc. A multilayer structure may be used.

3. Structure Next, the structure according to the present invention will be described. As described above, the structure in the present invention is one in which the upper current collector is fixed.
In the present invention, the upper current collector is fixed by being fixed to such a structure, and can be pressed upward by the safety mechanism as described above. In addition, when the impact from the outside is received, the pressing force by the safety mechanism is released, and the lower current collector, which will be described later, moves downward by gravity, so that it can be separated at the separable position. It becomes.

  The structure is not particularly limited as long as it can fix the upper current collector to the lower part of the structure. For example, a car, a railway vehicle, a building, etc. can be mentioned. In particular, an automobile is preferable.

4). Others (1) Manufacturing method of all-solid lithium secondary battery As a manufacturing method of the all-solid lithium secondary battery, the lower current collector is normally supported by the pressing force by the safety mechanism pressing upward. When the impact from the outside is received, the pressing force by the safety mechanism is released, so that the lower current collector can be moved downward by gravity and separated at the separable position. There is no particular limitation as long as it is a manufacturing method capable of obtaining the all solid lithium secondary battery.

For example, after the powder raw material is press-molded to form a positive electrode layer pellet, a negative electrode layer pellet, and a solid electrolyte layer pellet, the positive electrode layer is sequentially placed under the upper current collector fixed to the lower part of the structure. After installing the pellet, the solid electrolyte layer pellet, the negative electrode layer pellet, and the lower current collector, a method of supporting the surface by generating a pressing force that presses the lower current collector upward by a safety mechanism, etc. it can.
Further, for example, after the powder raw material is press-molded to form a positive electrode layer pellet, a negative electrode layer pellet, and a solid electrolyte layer pellet, the solid electrolyte layer pellet is sandwiched between the positive electrode layer pellet and the negative electrode layer pellet. After that, it is further press-molded to form power generation element pellets. Further, after the power generation element pellets are sintered to form a power generation element sintered body, the power generation element sintered body and the lower current collector are sequentially placed under the upper current collector fixed to the lower part of the structure. After the body is installed, there can be mentioned a method of generating and supporting a pressing force that presses the lower current collector upward by a safety mechanism.
Further, for example, a negative electrode layer, a solid electrolyte layer, and a positive electrode layer are sequentially formed on the lower current collector by sputtering or the like. Next, after these are installed under the upper current collector fixed to the lower part of the structure so that the positive electrode layer is in contact with the upper current collector, the lower current collector is moved upward by a safety mechanism. Examples include a method of supporting by generating a pressing force to be pressed.
In addition, for example, after the power generation element is installed so as to be held by the upper current collector and the lower current collector, the power generation element is installed inside a vacuum sealed package or the like as a safety mechanism, and the safety mechanism is decompressed. Thus, a pressing force that presses the lower current collector upward is generated and supported. Then, the method etc. which fix an upper electrical power collector to the said structure lower part can be mentioned.
The method of fixing the upper current collector to the lower part of the structure is not particularly limited as long as it is a method capable of fixing the upper current collector to the lower part of the structure. The method of fixing using a volt | bolt etc. can be mentioned.

(2) Shape As the shape of the all-solid lithium secondary battery of the present invention, the all-solid lithium secondary battery supported by the pressing force generated by the safety mechanism can be charged and discharged with desired battery characteristics. Further, when receiving an impact from the outside, the support by the pressing force is released, and the lower current collector can be separated at the separable position by moving downward by gravity. Any shape that can be used is not particularly limited.
Specifically, a flat plate shape in which a flat plate-like upper current collector, a power generation element, a lower current collector and the like are laminated as illustrated in FIG. 1 described above, a laminate shape as illustrated in FIG. be able to. The all-solid lithium secondary battery supported by the pressing force generated by the safety mechanism can be charged and discharged with desired battery characteristics, and can be separated when subjected to external impacts. Thus, as long as charging / discharging can be stopped, a shape in which an upper current collector, a power generation element, a lower current collector and the like having a lightly curved flat plate shape are stacked may be used.

(3) Use Although it does not specifically limit as a use of the all-solid-state lithium secondary battery of this invention, For example, it uses as an all-solid-state lithium secondary battery for automobiles, for rail vehicles, for buildings, etc. be able to. In particular, it is preferably used as an all solid lithium secondary battery for automobiles.

B. First, an all-solid lithium secondary battery mounting structure according to the present invention will be described in detail below.
An all solid lithium secondary battery mounting structure of the present invention is an all solid lithium secondary battery mounting structure having a structure and an all solid lithium secondary battery, wherein the all solid lithium secondary battery has the above structure. Sandwiched between the upper current collector fixed to the lower part of the object, the lower current collector supported by the pressing force pressed upward by the safety mechanism, and the upper current collector and the lower current collector An all-solid-state lithium secondary battery element including a power generation element and the safety mechanism. When the safety mechanism receives an impact from the outside, the pressing force is released, and the lower current collector is It is characterized in that it has a structure in which it moves downward and is separated at the separable position.

According to the present invention, when the impact from the outside is received, the pressing force of the safety mechanism is released, and the lower current collector is moved downward by gravity to be separated at the separable position. Therefore, charging / discharging stops. Thereby, safety can be improved.
That is, in the all-solid lithium secondary battery mounting structure of the present invention, the above-described separable positions separated as described above are merely brought into contact with each other without sticking the solids to each other. Therefore, the pressing force of the safety mechanism is released, and the lower current collector moves downward due to gravity, so that it can be easily separated to stop charging / discharging.
Furthermore, since it is easily separable as described above, it is necessary to provide a contact blocking portion formed in the battery, which is necessary to prevent contact with an adhesive liquid as in the case of using a liquid electrolyte. There is no. Therefore, safety can be improved by a more simplified battery structure.

Such an all-solid lithium secondary battery mounting structure of the present invention is not particularly limited as long as it has at least the all-solid lithium secondary battery and the structure.
The all-solid lithium secondary battery, the structure, etc. used in the present invention are the same as those described in the above-mentioned “A. All-solid lithium secondary battery”, and thus the description thereof is omitted here.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

It is a schematic sectional drawing which shows typically an example of the all-solid-state lithium secondary battery of this invention. In the all-solid-state lithium secondary battery of this invention, it is a schematic sectional drawing which shows typically an example of the state after the pressing force by a safety mechanism was cancelled | released. It is a schematic sectional drawing which shows typically an example of the all-solid-state lithium secondary battery of this invention. It is a schematic sectional drawing which shows typically an example of the all-solid-state lithium secondary battery of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Upper collector 2 ... Lower collector 3 ... Power generation element 4 ... All-solid-state lithium secondary battery element 5 ... Safety mechanism 6 ... Lead wire 7 ... Solid electrolyte layer 8 ... Positive electrode layer 9 ... Negative electrode layer 10 ... Structure

Claims (4)

Sandwiched between the upper current collector fixed to the lower part of the structure, the lower current collector supported by the pressing force pressing upward by the safety mechanism, and the upper current collector and the lower current collector An all-solid lithium secondary battery element including an all-solid-state lithium secondary battery element including the power generation element and the safety mechanism,
When the safety mechanism receives an impact from the outside, the pressing force is released, the lower current collector moves downward due to gravity, and between the upper current collector and the power generation element, An all-solid-state lithium secondary battery having a structure separated in a power generation element or at any position between the lower current collector and the power generation element.   The safety mechanism is a flexible vacuum sealed package. The all-solid lithium secondary battery element is installed inside the vacuum sealed package, and the inside of the vacuum sealed package is decompressed and sealed, thereby 2. The all-solid lithium secondary battery according to claim 1, wherein pressure is generated and the lower current collector is pressed and supported upward.   The all solid lithium secondary battery element and the vacuum sealed package are installed inside a pressure sealed package, and a space between the vacuum sealed package and the pressure sealed package is pressurized and sealed, The all-solid lithium secondary battery according to claim 2.   An all-solid lithium secondary battery mounting structure having a structure and an all-solid lithium secondary battery, wherein the all-solid lithium secondary battery is fixed to the lower part of the structure, and a safety mechanism An all-solid-state lithium secondary battery element including a lower current collector supported by a pressing force that is pressed upward by a power generation element, and a power generation element sandwiched between the upper current collector and the lower current collector; A safety mechanism, and when the safety mechanism receives an external impact, the pressing force is released, the lower current collector moves downward due to gravity, and the upper current collector and the safety mechanism All-solid-state lithium secondary battery mounting structure characterized by having a structure that is separated at any position between the power generation element, within the power generation element, or between the lower current collector and the power generation element object.

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