JP2011070989A - Connection method of voltage detection terminal, and battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection method of a voltage detection terminal capable of easily connecting a collector and a voltage detection terminal to each other, and to provide a battery. <P>SOLUTION: A connection method of connecting a voltage detection terminal to an electrode provided with a collector and an electrode layer formed on a surface of the collector includes: a step of forming a recessed portion in which an electrode layer and/or a coating layer formed around the electrode layer is/are broken to form a recessed portion that communicates with a collector; and a connection step of fixing a voltage detection terminal to be in contact with the recessed portion to thereby electrically connect the collector and the voltage detection terminal to each other. A battery includes: a voltage detection terminal connected to a collector by the connection method; and an electrode including the collector and an electrode layer formed on the surface of the collector. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for connecting voltage detection terminals, and a battery including a voltage detection terminal and a current collector connected by the connection method.

  A lithium ion secondary battery has the characteristics that it has a higher energy density than other secondary batteries and can operate at a high voltage. For this reason, it is used as a secondary battery that can be easily reduced in size and weight in information equipment such as a mobile phone, and in recent years, there is an increasing demand for large-sized power such as for hybrid vehicles.

  When using a lithium ion secondary battery in a form in which a plurality of single cells are connected in series in order to ensure high output, if the single cells are connected via a connection portion, the output is reduced due to the electrical resistance of the connection portion. In addition, energy density tends to decrease. Such a problem can be solved by using a bipolar electrode in which a positive electrode layer is formed on one surface of the current collector and a negative electrode layer is formed on the other surface. Research and development on “bipolar battery”) is underway.

  As a technology related to a bipolar battery, for example, Patent Document 1 discloses a bipolar lithium ion secondary battery in which a plurality of bipolar electrodes are stacked in series with an electrolyte interposed therebetween, and a part of the periphery of the electrode is not subjected to insulation treatment and is not collected. A bipolar battery characterized in that there is a portion where an electric body is exposed is disclosed. And this patent document 1 has shown the form by which the connector for voltage detection and capacity | capacitance adjustment inserted in the inside from the battery outside is connected to the collector exposed part of the electrode peripheral part. Patent Document 2 discloses a power storage device that can detect the voltage of each unit cell constituting the power storage device by connecting a plurality of conductive members to electrode bodies at different positions in the stacking direction. ing.

JP 2004-253155 A JP 2008-251305 A

  In the technique disclosed in Patent Document 1, it is necessary to provide an exposed portion on the current collector. In this technique, in order to accurately detect the voltage for each cell, it is necessary to increase the positioning accuracy of the exposed portion to which the connector is connected when performing the insulation process. However, there is a problem that it is actually difficult to perform the insulation process with the positioning accuracy increased to such an extent that the voltage can be accurately detected. Such a problem is difficult to solve even if the technique disclosed in Patent Document 1 and the technique disclosed in Patent Document 2 are combined.

  Therefore, the present invention provides a voltage detection terminal connection method that can easily connect a current collector and a voltage detection terminal, and a battery including the current collector and the voltage detection terminal connected by the connection method. The task is to do.

In order to solve the above problems, the present invention takes the following means. That is,
A first aspect of the present invention is a method of connecting a voltage detection terminal to an electrode including a current collector and an electrode layer formed on the surface of the current collector, the electrode layer and / or the electrode layer Breaking the coating layer formed in the surroundings, forming a recess communicating with the current collector, fixing the voltage detection terminal so as to contact the recess, and electrically connecting the current collector and the voltage detection terminal A voltage detecting terminal connecting method.

  Here, the “electrode layer” in the present invention is a concept including a positive electrode layer and a negative electrode layer. In addition, the “electrode” in the present invention is a bipolar electrode in which a positive electrode layer is formed on one surface of the current collector and a negative electrode layer is formed on the other surface, and the same electrode on the front and back surfaces of the current collector It is a concept including an electrode in which a layer (positive electrode layer or negative electrode layer) is formed and an electrode in which an electrode layer is formed only on one side of a current collector. In addition, the “coating layer” in the present invention refers to a coating layer formed on the surface of the current collector so as to surround the electrode layer, and includes an insulating layer constituted by an insulator and an end portion of the current collector. It is a concept including an end protection layer formed for the purpose of protection. Further, “fixing the voltage detection terminal so as to be in contact with the concave portion” means fixing the voltage detection terminal so that the voltage detection terminal and the end surface and / or the inner peripheral surface of the concave portion are in contact with each other. It is also included that the voltage detection terminal is fixed in a state in which a part thereof is constituted by a hole penetrating the voltage detection terminal. In addition, “electrically connecting the current collector and the voltage detection terminal” means that the current collector and the voltage detection terminal are in direct contact with each other, as well as other conductive members. A mode in which the current collector and the voltage detection terminal are electrically connected via the terminal is also included.

  Further, in the first aspect of the present invention, the method includes a contact step of bringing the voltage detection terminal into contact with the electrode before the recess forming step, and the recess forming step includes the electrode layer and / or the covering layer, the voltage detection terminal, Forming a recess that passes through the current collector and is connected to the current collector, and the connecting step uses a conductive member inserted into the recess to fix the voltage detection terminal so as to contact the current collector, And a step of electrically connecting the voltage detection terminal and the voltage detection terminal via a conductive member.

  In the first aspect of the present invention, the recess may be formed by a voltage detection terminal.

  In the first aspect of the present invention, the recess may be a hole penetrating the current collector.

  According to a second aspect of the present invention, there is provided a voltage detection terminal connected to the current collector according to the first aspect of the present invention, and an electrode comprising the current collector and an electrode layer formed on the surface of the current collector. A battery comprising:

  According to a third aspect of the present invention, there is provided a current collector, an electrode layer formed on the surface of the current collector, an electrode having a coating layer formed around the electrode layer, and the electrode layer and / or coating A voltage detection terminal disposed in contact with the layer, and the current collector and the voltage detection terminal are disposed in a recess that penetrates the electrode layer and / or the coating layer and reaches the current collector. It is a battery characterized by being connected through the electrically conductive material.

  Here, the “conductive material” in the third aspect of the present invention may be a member different from the voltage detection terminal, or may be a part of the voltage detection terminal. When the conductive material is a member different from the voltage detection terminal, the current collector and the voltage detection terminal are connected and fixed via a different conductive member. On the other hand, when the conductive material is a part of the voltage detection terminal, a part of the voltage detection terminal is disposed in the recess, and the voltage detection terminal is fixed in a form in direct contact with the current collector.

  In the first aspect of the present invention, the positive electrode layer, the negative electrode layer, and the coating layer are formed on the current collector, and then a recess is formed, and the voltage detection terminal is fixed so as to be in contact with the recess, thereby detecting the voltage. Since the terminal and the current collector are electrically connected, there is no need to provide an exposed portion where a coating layer or the like is not formed. Furthermore, according to the present invention, the voltage detection terminal and the current collector can be connected before the plurality of electrodes are stacked. Therefore, according to the 1st aspect of this invention, the connection method of the voltage detection terminal which can connect a collector and a voltage detection terminal easily can be provided.

  Further, in the first aspect of the present invention, after the voltage detection terminal and the electrode are brought into contact with each other, a concave portion penetrating the voltage detection terminal is formed, and the current collector is formed using the conductive member inserted into the concave portion. Even if the voltage detection terminal is electrically connected, the current collector and the voltage detection terminal can be easily connected.

  In the first aspect of the present invention, the current collector and the voltage detection terminal can be easily connected even if the recess is formed by the voltage detection terminal.

  In addition, in the first aspect of the present invention, since the recess is a hole penetrating the current collector, in addition to the above effects, it is easy to fix the voltage detection terminal.

  In the second aspect of the present invention, the current collector of the electrode and the voltage detection terminal are connected according to the first aspect of the present invention. Therefore, according to the 2nd aspect of this invention, the battery which can be manufactured easily by connecting a collector and a voltage detection terminal easily can be provided.

  In the third aspect of the present invention, the current collector of the electrode and the voltage detection terminal are connected via the conductive material disposed in the recess. Therefore, according to the 3rd aspect of this invention, the battery which can be manufactured easily by connecting a collector and a voltage detection terminal easily can be provided.

It is a perspective view which shows the voltage detection terminal and bipolar electrode which were connected to the electrical power collector by this invention. It is the II-II arrow sectional drawing of the voltage detection terminal and bipolar electrode which were shown in FIG. It is a flowchart explaining the example of the form of the connection method of the voltage detection terminal concerning this invention. It is a figure explaining the example of the form of the connection method of the voltage detection terminal concerning this invention. It is a figure explaining the example of the form of the connection method of the voltage detection terminal concerning this invention. It is a top view which shows the voltage detection terminal and bipolar electrode which were connected to the electrical power collector by other embodiment of this invention. It is a VII-VII arrow sectional view of a voltage detection terminal and a bipolar electrode shown in FIG. It is a figure explaining the example of the form of the connection method of the voltage detection terminal concerning this invention. It is a figure explaining the connection position of the voltage detection terminal connected to the electrical power collector by this invention.

  Hereinafter, a method for connecting voltage detection terminals according to the present invention (hereinafter sometimes simply referred to as “the present invention”) will be described with reference to the drawings. In addition, the form shown below is an illustration of this invention and this invention is not limited to the form shown below.

1. First Embodiment FIG. 1 is a perspective view showing a voltage detection terminal 6 and a bipolar electrode 5 electrically connected to a current collector 1 by the voltage detection terminal connection method of the present invention according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II of the voltage detection terminal 6 and the bipolar electrode 5 shown in FIG. 1 and 2, only a portion where the positive electrode layer 2 and the negative electrode layer 3 are formed is extracted from the bipolar electrode 5. As shown in FIGS. 1 and 2, the bipolar electrode 5 includes a current collector 1, a positive electrode layer 2 formed on one surface of the current collector 1, and the other surface (positive electrode layer 2) of the current collector 1. The negative electrode layer 3 is formed on the surface opposite to the surface where the negative electrode layer is formed, and the electrolyte layer 4 is disposed so as to be in contact with the negative electrode layer 2. On the other hand, the voltage detection terminal 6 is disposed so as to be in contact with the positive electrode layer 2, and is fixed by the conductive member 10 so that the contact between the bipolar electrode 5 and the voltage detection terminal 6 is maintained. The conductive member 10 in the present embodiment is a needle-like member used in a stapler for stationery. That is, the conductive member 10 is inserted into a hole penetrating the voltage detection terminal 6 and the bipolar electrode 5, and the voltage detection terminal 6 and the current collector 1 are electrically connected via the conductive member 10. Yes. The exposed portions of the conductive member 10 shown in FIGS. 1 and 2 (the part located above the voltage detection terminal 6 and the part located below the electrolyte layer 4) are covered with insulators 7 and 7. Yes.

  In the present invention according to the first embodiment, first, the voltage detection terminal 6 is arranged so as to be in contact with the positive electrode layer 2 of the bipolar electrode 5 (contact process S1). Next, the tip of the conductive member 10 having a U-shaped needle shape is pressed against the upper surface of the voltage detection terminal 6, and the voltage detection terminal 6, the bipolar electrode 5, and the electrolyte layer 4 are pierced in order, whereby the voltage detection terminal 6, the positive electrode layer 2, the current collector 1, the negative electrode layer 3, and the hole passing through the electrolyte layer 4 (recess formation step S2), and then the conductive member 10 reaching the lower side of the electrolyte layer 4 The voltage detection terminal 6 and the bipolar electrode 5 are fixed by bending the needle tip portion (connection step S3). Thereafter, the portions of the conductive member 10 exposed on the upper surface of the voltage detection terminal 6 and the lower surface of the electrolyte layer 4 are covered with the insulators 7 and 7 (covering step S4). FIG. 3 shows a flowchart of the present invention according to the first embodiment. By fixing the voltage detection terminal 6 in such a form, the voltage detection terminal 6 and the current collector 1 can be easily connected.

  In the above description, the form in which the voltage detection terminal 6, the positive electrode layer 2, the current collector 1, the negative electrode layer 3, and the electrolyte layer 4 are stacked in this order is exemplified, but the present invention is limited to this form. Instead, for example, the voltage detection terminal 6, the electrolyte layer 4, the positive electrode layer 2, the current collector 1, the negative electrode layer 3, the voltage detection terminal 6, the negative electrode layer 3, the current collector 1, the positive electrode layer 2, and the electrolyte layer They may be laminated in the order of 4. The same applies to the following embodiments.

2. Second Embodiment FIG. 4 is a cross-sectional view illustrating a method for connecting a voltage detection terminal according to a second embodiment of the present invention. 4A is a cross-sectional view showing a state before the voltage detection terminal 6 and the current collector 1 are connected by the conductive member 11, and FIG. 4B is a cross-sectional view of the voltage detection terminal 6 by the conductive member 11. It is sectional drawing which shows the state after connecting with the electrical power collector. In FIG. 4, only a portion where the positive electrode layer 2 and the negative electrode layer 3 are formed is extracted from the bipolar electrode 5. 4, components similar to those in FIGS. 1 and 2 are denoted by the same reference numerals as those used in these drawings, and description thereof is omitted as appropriate.

  As shown in FIG. 4, the conductive member 11 has a rivet shape. In this invention concerning 2nd Embodiment, as shown to Fig.4 (a), first, the voltage detection terminal 6 is arrange | positioned in the positive electrode layer 2 side of the bipolar electrode 5 in which the positive electrode layer 2 and the negative electrode layer 3 are each formed. (Contact process). Next, the tip of the rivet-shaped conductive member 11 is pressed against the upper surface of the voltage detection terminal 6, and is inserted into the voltage detection terminal 6, the bipolar electrode 5, and the electrolyte layer 4 in order, whereby the voltage detection terminal 6, the positive electrode layer 2. After forming a hole penetrating the current collector 1, the negative electrode layer 3, and the electrolyte layer 4 (recess formation step), the tip of the conductive member 11 reaching the lower side of the electrolyte layer 4 is caulked and bent. Thus, the voltage detection terminal 6 and the bipolar electrode 5 are fixed (connection process). Thereafter, as shown in FIG. 4B, the portions of the conductive member 11 exposed on the upper surface of the voltage detection terminal 6 and the lower surface of the electrolyte layer 4 are covered with insulators 7 and 7 (covering step). ). The voltage detection terminal 6 and the current collector 1 can be easily connected also by fixing the voltage detection terminal 6 in such a form.

  In the above description regarding the present invention, the conductive members 10 and 11 have been illustrated as penetrating the electrolyte layer 4, but the present invention is not limited to this form, and the voltage detection terminal 6, the positive electrode layer 2, the current collector. It is also possible to adopt a form that penetrates only the body 1 and the negative electrode layer 3 or a form that penetrates only the voltage detection terminal 6, the negative electrode layer 3, the current collector 1, and the positive electrode layer 2.

  Further, in the above description regarding the present invention, holes that penetrate the positive electrode layer 2, the current collector 1, and the negative electrode layer 3 are formed by the conductive members 10 and 11, and the voltage is passed through the conductive members 10 and 11. Although the form in which the detection terminal 6 and the current collector 1 are connected is illustrated, the present invention is not limited to this form. Therefore, a mode (third embodiment) in which the voltage detection terminal and the current collector are directly connected without using a conductive member will be described below.

3. 3rd Embodiment FIG. 5: is sectional drawing explaining the connection method of the voltage detection terminal of this invention concerning 3rd Embodiment. 5A is a cross-sectional view showing a state before the voltage detection terminal 8 and the current collector 1 are connected, and FIG. 5B is a view after the voltage detection terminal 8 and the current collector 1 are connected. It is sectional drawing which shows a state. In FIG. 5, only the portion where the positive electrode layer 2 and the negative electrode layer 3 are formed is extracted from the bipolar electrode 5. 5, components similar to those in FIGS. 1 and 2 are denoted by the same reference numerals as those used in these drawings, and description thereof is omitted as appropriate.

  As shown in FIG. 5, the voltage detection terminal 8 used in the voltage detection terminal connection method of the present invention according to the third embodiment has an uneven portion (tip) on the side in contact with the current collector 1. Yes. In this invention concerning 3rd Embodiment, the front-end | tip of the voltage detection terminal 8 arrange | positioned at the positive electrode layer 2 side is pressed against the bipolar electrode 5, and the recessed part which breaks the positive electrode layer 2 and reaches the electrical power collector 1 is formed ( At the same time as the recess formation step, the voltage detection terminal 8 and the current collector 1 are connected by connecting the unevenness at the tip of the voltage detection terminal 8 into the current collector 1 and fixing the voltage detection terminal 8 (connection). Process). By setting it as this form, the voltage detection terminal 8 and the electrical power collector 1 can be connected easily, without using an electroconductive member.

  In the above description regarding the present invention according to the third embodiment, the form in which the tip of the voltage detection terminal 8 breaks the positive electrode layer 2 and reaches the current collector 1 is exemplified. It is not limited to. When the electrolyte layer 4 is arranged in contact with the positive electrode layer 2, the tip of the voltage detection terminal 8 forms a recess that breaks the negative electrode layer 3 and reaches the current collector 1. It is also possible to connect the detection terminal 8 and the current collector 1.

  Moreover, although the said description regarding this invention illustrated the form in which the recessed part which broke the positive electrode layer 2 and / or the negative electrode layer 3 and reached the electrical power collector 1 was formed, this invention is not limited to the said form. Absent. Then, the form (4th Embodiment) in which a recessed part is formed in places other than a positive electrode layer and a negative electrode layer is demonstrated below.

4). Fourth Embodiment FIG. 6 is a top view showing the voltage detection terminal 6 and the bipolar electrode 5 connected to the current collector by the voltage detection terminal connection method of the present invention according to the fourth embodiment, and FIG. FIG. 7 is a cross-sectional view taken along arrows VII-VII of the voltage detection terminal 6 and the bipolar electrode 5 shown in FIG. 6. 6 and 7, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals as those used in these drawings, and the description thereof is omitted as appropriate.

  As shown in FIGS. 6 and 7, the bipolar electrode 5 has a positive electrode layer 2 formed on one surface of the current collector 1 and a negative electrode layer 3 formed on the other surface. Is an insulating layer 9 (hereinafter sometimes referred to as “insulating layer 9a”), but around the negative electrode layer 3 and the electrolyte layer 4, the insulating layer 9 (hereinafter sometimes referred to as “insulating layer 9b”). Are formed. As shown in FIGS. 6 and 7, in the voltage detection terminal connection method of the present invention according to the fourth embodiment, the voltage detection terminal 6 is arranged so as to be in contact with the insulating layer 9a, and the conductive member 10 is disposed. The voltage detection terminal 6 and the current collector 1 are connected via each other.

  In this invention concerning 4th Embodiment, the voltage detection terminal 6 is first arrange | positioned so that the insulating layer 9a formed in the circumference | surroundings of the positive electrode layer 2 may be contacted (contact process). Next, the tip of the conductive member 10 having a U-shaped needle shape is pressed against the upper surface of the voltage detection terminal 6, and the voltage detection terminal 6, the insulating layer 9a, the current collector 1, and the insulating layer 9b are pierced in order. Thus, after forming a hole penetrating the voltage detection terminal 6, the insulating layer 9a, the current collector 1, and the insulating layer 9b (recess forming step), the conductive member 10 reaching the lower side of the insulating layer 9b The voltage detection terminal 6 and the bipolar electrode 5 are fixed by bending the needle tip (connection process). Thereafter, as shown in FIGS. 6 and 7, the portions of the conductive member 10 exposed on the upper surface of the voltage detection terminal 6 and the lower surface of the insulating layer 9b are covered with the insulators 7 and 7 (covering step). ). In the present invention, the voltage detection terminal 6 and the current collector 1 can be easily connected also by fixing the voltage detection terminal 6 in such a form.

  In the above description of the present invention, the form in which the voltage detection terminals 6 and 8 having plate-like portions are used is exemplified, but the present invention is not limited to this form. Therefore, a mode in which a linear voltage detection terminal is used (fifth embodiment) will be described below.

5). Fifth Embodiment FIG. 8 is a cross-sectional view illustrating a method for connecting voltage detection terminals according to a fifth embodiment of the present invention. 8A is a cross-sectional view showing a state before the voltage detection terminal 12 and the current collector 1 are connected, and FIG. 8B is a view after the voltage detection terminal 12 and the current collector 1 are connected. It is sectional drawing which shows a state. In FIG. 8, only a portion where the positive electrode layer 2 and the negative electrode layer 3 are formed is extracted from the bipolar electrode 5. 8, components similar to those in FIG. 4 are denoted by the same reference numerals as those used in FIG. 4, and description thereof is omitted as appropriate.

  As shown in FIG. 8, the voltage detection terminal 12 used in the voltage detection terminal connection method of the present invention according to the fifth embodiment is linear and connected to a rivet-shaped conductive member 13. In this invention concerning 5th Embodiment, as shown to Fig.8 (a), the front-end | tip of the electroconductive member 13 arrange | positioned at the positive electrode layer 2 side is pressed on the upper surface of the positive electrode layer 2, and the positive electrode layer 2, current collection is carried out. After forming holes penetrating the positive electrode layer 2, the current collector 1, the negative electrode layer 3, and the electrolyte layer 4 by sequentially inserting them into the body 1, the negative electrode layer 3, and the electrolyte layer 4 (recess formation step) The conductive member 13 is fixed by caulking and bending the tip of the conductive member 13 reaching the lower side of the electrolyte layer 4 (connection process). Thereafter, as shown in FIG. 8B, the portions of the conductive member 13 exposed on the upper surface of the positive electrode layer 2 and the lower surface of the electrolyte layer 4 are covered with insulators 7 and 7 (covering step). . Also by fixing the voltage detection terminal 12 in such a form, the voltage detection terminal 12 and the current collector 1 can be easily connected via the conductive member 13.

  In the above description regarding the connection method of the voltage detection terminal according to the first embodiment, the second embodiment, the fourth embodiment, and the fifth embodiment of the present invention, the insulator 7 is used to connect the conductive members 10, 11, and 13. Although the form in which the exposed portion is coated is mentioned, the present invention is not limited to the form. However, it is preferable to cover the exposed portions of the conductive members 10, 11, and 13 with the insulator 7 from the viewpoint of making it easy to detect an accurate voltage. Moreover, in the said description regarding the connection method of the voltage detection terminal of this invention concerning 3rd Embodiment, although the form which the voltage detection terminal 8 is not coat | covered with an insulator was mentioned, this invention is not limited to the said form. . If the voltage can be detected using the voltage detection terminal 8, the exposed portion of the voltage detection terminal 8 can be covered with an insulator.

  FIG. 9 is a view for explaining the connection position of the voltage detection terminal 6 connected to the current collector 1 according to the present invention according to the first embodiment. FIG. 9A is a diagram showing a plurality of bipolar electrodes 5, 5, 5 to which voltage detection terminals 6, 6, 6 are respectively connected, and FIG. 9B is a diagram showing a plurality of bipolar electrodes shown in FIG. 9A. It is a figure which shows the laminated body 20 (a part of battery of this invention) formed by laminating | stacking the bipolar electrodes 5, 5, and 5. FIG. FIG. 9 shows only the portion of the bipolar electrode 5 where the positive electrode layer 2 and the negative electrode layer 3 are formed. 9, components similar to those in FIGS. 1 and 2 are denoted by the same reference numerals as those used in these drawings, and description thereof will be omitted as appropriate. In order to make the figure easy to see, some reference numerals are omitted in FIG.

  As shown in FIG. 9A, the position where the voltage detection terminal 6 connected to the current collector 1 is fixed according to the present invention is not limited to one specific position. When a plurality of bipolar electrodes 5, 5,... Having a voltage detection terminal 6 connected to the current collector 1 according to the present invention are electrically connected in series, the voltage of each cell can be easily detected. In view of the above, the voltage detection terminals 6, 6,... Are shifted so that the positions of the voltage detection terminals 6, 6,. It is preferable to shift and fix (see FIG. 9B).

  In the present invention, the voltage detection terminals 6, 8, and 12 can be made of a known conductive material such as aluminum, and the conductive members 10, 11, and 13 are also made of a known conductive material such as aluminum. be able to. In this invention, the thickness of the voltage detection terminals 6 and 8 can be 0.1-30 mm, for example, and the diameter of the voltage detection terminal 12 can be 0.1-10 mm, for example. Furthermore, in this invention, the diameter of the electroconductive member 10 can be 0.1-10 mm, for example. Moreover, the diameter of the site | part of the electroconductive member 11 which has penetrated the voltage detection terminal 6 can be 0.1-20 mm, for example, and the site | part of the electroconductive member 13 which has penetrated the positive electrode layer 2 grade | etc., Can be used. A diameter can be 0.1-20 mm, for example.

  In the present invention, the form of the bipolar electrode 5 to which the voltage detection terminal is connected is not particularly limited, and a known one can be used. As the current collector 1, for example, an aluminum foil or the like can be used, and a plurality of metal foils laminated or a metal surface coated with aluminum can be used. In the present invention, the thickness of the current collector 1 can be, for example, about 1 μm to 100 μm.

Further, in the present invention, the positive electrode layer 2 contains at least a positive electrode active material, and if necessary, a conductive auxiliary agent that improves electronic conductivity, a binder, an inorganic electrolyte that improves ionic conductivity, a polymer gel electrolyte, A polymer electrolyte, an additive, etc. can be contained. As the positive electrode active material contained in the positive electrode layer 2, an active material containing 50% by mass or more of LiCoO ₂ can be used. As the conductive assistant, a fibrous carbon material typified by carbon nanotubes, a green compact of carbon black, or the like can be used. As the binder, polyvinylidene fluoride (PVDF) or the like can be used. In addition, known inorganic electrolytes, polymer gel electrolytes, polymer electrolytes, and additives can be appropriately used. In the present invention, the thickness of the positive electrode layer 2 can be, for example, about 10 μm to 500 μm. Such a positive electrode layer 2 can be produced by applying a slurry containing a positive electrode active material or the like to one surface of the current collector 1 and drying it.

  Further, in the present invention, the negative electrode layer 3 contains at least a negative electrode active material, and if necessary, a conductive auxiliary agent that improves electronic conductivity, a binder, an inorganic electrolyte that improves ionic conductivity, a polymer gel electrolyte, A polymer electrolyte, an additive, etc. can be contained. As the negative electrode active material contained in the negative electrode layer 3, carbon or the like can be used. In addition, the same conductive agent, binder, inorganic electrolyte, polymer gel electrolyte, polymer electrolyte, and additive as those for the positive electrode layer can be used. In the present invention, the thickness of the negative electrode layer 3 can be, for example, about 10 μm to 500 μm. Such a negative electrode layer 3 is produced through a step of applying a slurry containing a negative electrode active material or the like to the other surface of the current collector 1 (the surface on the back side of the surface on which the positive electrode layer 2 is to be formed) and drying. be able to.

  In the present invention, the form of the electrolyte layer 4 is not particularly limited, and a known one such as a layer containing a solid electrolyte having ionic conductivity and no conductivity may be used. it can. The thickness of the electrolyte layer 4 can be, for example, about 5 μm to 300 μm.

  Moreover, in this invention, the insulating layer 7 can be comprised with an insulating tape (polyimide film) etc., for example, and the insulating layer 9 can be comprised with an insulating tape (polyimide film) etc., for example.

  In the above description regarding the present invention, the mode of connecting the current collector of the bipolar electrode and the voltage detection terminal has been mainly described, but the present invention is not limited to the mode. The present invention provides a connection between a current collector and a voltage detection terminal of an electrode having the same electrode layer (positive electrode layer or negative electrode layer) formed on the front and back surfaces of the current collector, or an electrode layer only on one surface of the current collector. The present invention can also be applied to the connection between the current collector of the electrode formed with the voltage detection terminal.

  The voltage detection terminal connection method of the present invention can be used, for example, when the voltage detection terminal is connected to a current collector of a bipolar electrode that is to constitute a lithium ion secondary battery.

DESCRIPTION OF SYMBOLS 1 ... Current collector 2 ... Positive electrode layer (electrode layer)
3 ... Negative electrode layer (electrode layer)
4 ... Electrolyte layer 5 ... Bipolar electrode (electrode)
6 ... Voltage detection terminal 7 ... Insulator 8 ... Voltage detection terminal (conductive material)
9. Insulating layer (coating layer)
10: Conductive member (conductive material)
11 ... Conductive member (conductive material)
12 ... Voltage detection terminal 13 ... Conductive member (conductive material)
20 ... Laminated body (battery)

Claims (6)

A method of connecting a voltage detection terminal to an electrode comprising a current collector and an electrode layer formed on the surface of the current collector,
A recess forming step of breaking the electrode layer and / or the coating layer formed around the electrode layer to form a recess communicating with the current collector;
Fixing the voltage detection terminal so as to be in contact with the recess, and electrically connecting the current collector and the voltage detection terminal; and
A method for connecting voltage detection terminals, comprising: Before the recess forming step, the contact step of bringing the voltage detection terminal into contact with the electrode,
The recess forming step is a step of forming the recess that penetrates the electrode layer and / or the coating layer and the voltage detection terminal and communicates with the current collector,
The connecting step uses the conductive member inserted into the recess to fix the voltage detection terminal so as to contact the recess, and connects the current collector and the voltage detection terminal to the conductive member. The method for connecting voltage detection terminals according to claim 1, wherein the voltage detection terminal is a step of electrically connecting through the two. 2. The voltage detection terminal connection method according to claim 1, wherein the recess is formed by the voltage detection terminal. The method for connecting a voltage detection terminal according to claim 1, wherein the concave portion is a hole penetrating the current collector. A voltage detection terminal connected to the current collector by the voltage detection terminal connection method according to claim 1, and the current collector and an electrode layer formed on a surface of the current collector. A battery comprising the electrode. An electrode having a current collector, an electrode layer formed on the surface of the current collector, and a coating layer formed around the electrode layer; and an electrode layer and / or the coating layer so as to be in contact therewith A voltage detection terminal provided,
The current collector and the voltage detection terminal are connected to each other through a conductive material disposed in a recess that reaches the current collector through the electrode layer and / or the coating layer. Do the battery.

Images