JP2002216716A - Lithium secondary cell and connection structure of lithium secondary cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lithium secondary cell realizing enhancement of productivity by making an electrode lid excellent in assembling and function. SOLUTION: The lithium secondary cell 14 is provided with an internal electrode body 1 constituted by winding and laminating a positive electrode plate and a negative electrode plate on an outer periphery wall of a hollow cylindrical core 13 and impregnated therein with a non-aqueous electrolytic solution; a cylindrical battery case 24 which stores the internal electrode body 1 at the inside and of which both ends are opened; and two sheets of electrode caps which seal the internal electrode body 1 at both opened ends of he battery case 24. The electrode caps are provided with a plate-like member sealing the internal electrode body 1 and arranged so as to seal both opened ends of the battery case 24; an external terminal member introducing a current to the outside and projected on a surface of the electrode caps; and an internal terminal member taking out the current from the internal electrode body 1 and connected to the internal electrode body 1. At least two members of the plate-like member, the external terminal member and the internal terminal member are joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lithium secondary cell (hereinafter, also simply referred to as “unit cell”) and a connection structure of the lithium secondary cell (hereinafter, also simply referred to as “connection structure”). More particularly, the present invention relates to a lithium secondary battery having excellent productivity and a connection structure of the lithium secondary battery having excellent output and productivity.

[0002]

2. Description of the Related Art In recent years, lithium secondary cells have been widely used as power supplies for electronic devices such as portable communication devices and notebook personal computers. In addition, international demand for resource saving and energy saving for the protection of the global environment has increased, and lithium-ion batteries have been used as motor driving batteries for electric vehicles and hybrid electric vehicles (hereinafter, also simply referred to as “electric vehicles, etc.”). Secondary cells are being developed.

[0003] In this lithium secondary cell, an internal electrode body in which a positive electrode plate and a negative electrode plate are arranged so as to surround an outer peripheral wall of a hollow cylindrical core with a separator interposed therebetween and impregnated with a non-aqueous electrolyte solution And a cylindrical battery case having both ends opened and containing the internal electrode body therein, and an electrode lid sealing the internal electrode body at both open ends of the battery case.

Among them, an electrode cover has a current deriving function for deriving a current generated in an internal electrode body to the outside, and a pressure release function for preventing a battery from bursting when the pressure inside the battery rises abnormally. It must have a function and a function as an electrolyte injection port when injecting the electrolyte into the internal electrode body housed in the battery case. As shown in FIG. 1, the electrode cover is a small-sized component of the lithium secondary battery, but has a large effect on the output and durability of the battery.

Conventionally, as shown in FIG. 17, this electrode cover has a pole 50, a bolt 44, a nut 43, and a cap 4.
7, holding fitting 42, pressure relief valve 49, electrolyte injection port 48,
It is configured by combining components such as a ceramic washer 45 and a backup ring 46 (see Japanese Patent Application Laid-Open No. 9-92335).

However, the electrode cover described in Japanese Patent Application Laid-Open No. 9-92335 has a current deriving function, a pressure releasing function, and a function as an electrolyte injection port, but is constituted by a large number of components. The assembly workability is poor,
There is also a problem that mechanical production is difficult.

As shown in FIG. 17, the electrode cover has a pressure relief valve 49 separated from the center axis of the battery case 54.
Since it is arranged near the outer edge of the electrode lid, gas is difficult to escape from the hollow part of the core (contains a large amount of gas that causes an increase in internal pressure), and pressure relief valves are provided on both the positive and negative electrode lids. However, there is a problem that the rupture of the battery cannot be prevented unless the battery is disposed.

Further, as shown in FIG. 17, this electrode cover is provided with an electrolyte inlet 48 near the outer edge of the electrode cover, away from the center axis of the battery case 54, similarly to the pressure relief valve 49. Therefore, the electrolyte cannot be impregnated from the bottom of the battery through the injection nozzle through the hollow portion of the core,
Since the electrolyte is poured and impregnated from the upper surface of the internal electrode body,
There is a problem that the electrolyte is hardly impregnated and a considerable time is required for the injection of the electrolyte. Further, in this electrode cover, since the pressure release valve 49 and the electrolyte injection port 48 are separately provided, the area of the portion that must be sealed increases, and the electrolyte easily leaks. .

On the other hand, in order to drive a motor, a plurality of cells are connected in series and used in order to secure a voltage required for driving. Actually, in electric vehicles and the like, 1
A current of 00 V or more can frequently occur. Therefore, in order to realize such high output characteristics and large current characteristics, it is important to adopt a structure that reduces connection resistance due to connection of unit cells as much as possible.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an electrode cover having good assembling workability and functionality. It is an object of the present invention to provide a lithium secondary battery that improves productivity. For another purpose,
In order to maximize the performance of lithium secondary cells, output is improved by suppressing the connection resistance when connecting multiple cells, and productivity is improved by simplifying the structure. It is an object of the present invention to provide a connection structure for a lithium secondary battery.

[0011]

That is, according to the present invention, a positive electrode plate and a negative electrode plate are wound and laminated on the outer peripheral wall of a hollow cylindrical core, and a non-aqueous electrolytic solution is provided therein. A liquid-impregnated internal electrode body, a cylindrical battery case containing the internal electrode body therein, and open at both ends, and the internal electrode body sealed at both open ends of the battery case.
A lithium secondary battery including a plurality of electrode lids, wherein the electrode lid seals the internal electrode body, and a plate-shaped member disposed to seal both open ends of the battery case. ,
Deriving a current to the outside, an external terminal member protruding on the surface of the electrode cover, and extracting a current from the internal electrode body,
A lithium secondary cell comprising: an internal terminal member connected to the internal electrode body; and the plate-shaped member, the external terminal member, and at least two of the internal terminal members being joined. Is provided.

At this time, it is preferable that at least one of the plate-shaped member, the external terminal member, and the internal terminal member is formed by press working or cold forging, thereby reducing processing cost. Reduction and improvement in yield can be expected. A plate-shaped member, the external terminal member,
Preferably, at least two of the internal terminal members are made by one or more methods selected from the group consisting of friction welding, brazing, welding, caulking, and forging caulking.

In the present invention, it is preferable that at least one of the electrode lids has a pressure release hole at a position corresponding to the center axis of the core, and the center axis of the core is coaxial with the center axis of the battery case. Preferably, there is. Further, it is preferable that the external terminal member has a hollow portion, and this hollow portion serves as a pressure release passage of the pressure release hole.

Further, according to the present invention, an internal electrode is formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein. A lithium secondary battery comprising a body, a cylindrical battery case having both ends opened, and containing the internal electrode body therein, and an electrode lid sealing the internal electrode body at both open ends of the battery case. A battery, wherein the electrode cover seals the internal electrode body, a plate-shaped member arranged to seal open both ends of the battery case, and guides a current to the outside. An external terminal member protruding on the surface, and an electric terminal for extracting current from the internal electrode body, including an internal terminal member connected to the internal electrode body, and an elastic body, and the plate-shaped member, the external terminal member, and the At least two of the internal terminal members are joined And a lithium secondary cell.

At this time, it is preferable that the elastic body is sandwiched between the plate member and any one of the external terminal member and the internal terminal member, and it is preferable that the positive electrode and the negative electrode are electrically insulated. In addition, as the elastic body, 1
It is preferable to have an electrical resistivity of 0 ¹⁰ Ω / cm or more, and it is preferable to use at least two types of packings having different hardnesses. When the elastic body is sandwiched between the plate-shaped member and any of the external terminal member and the internal terminal member, the amount of deformation of the elastic body pressed against the positive electrode in the pressure contact direction is larger than the springback amount, and It is preferable that the pressing force applied to the elastic body is not more than the magnitude of the force for maintaining the elastic body at an elastic maintenance rate of 95% or more. Also,
The elastic body is preferably any of ethylene polypropylene rubber, polyethylene, polypropylene, and fluororesin.

In the present invention, the external terminal member and the internal terminal member are preferably formed using different metals. Specifically, the plate member, the external terminal member, and the internal terminal member are made of Al. , Cu, Ni or any alloy thereof, and at least two of the plate-shaped member, the external terminal member, and the internal terminal member are friction-bonded, brazed,
It is preferably produced by one or more methods selected from the group consisting of welding, caulking, and forging caulking.

Further, in the present invention, the battery case and the electrode cover are formed by press-fitting a portion of the battery case in contact with the electrode cover and an outer edge portion of the electrode cover, and / or an end of the battery case is formed. It is preferable that the parts and the outer edge of the electrode lid be joined by welding.

Further, according to the present invention, an internal electrode is formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein. A lithium secondary battery comprising a body, a cylindrical battery case having both ends opened, and containing the internal electrode body therein, and an electrode lid sealing the internal electrode body at both open ends of the battery case. A battery, wherein the electrode lid seals the internal electrode body, a plate-shaped member disposed to seal open both ends of the battery case, and a current drawn from the internal electrode body, and A terminal member that is connected to the internal electrode body and protrudes above the surface of the electrode lid, and absorbs the impact of pressure contact between the plate member and the terminal member. Between the external terminal member, and between the plate-like member and the inner An elastic body sandwiched between external terminal members and the plate-shaped member, the terminal member, and the elastic member, which fix the elastic member at a predetermined position, and press-contact the elastic member sandwiched between the terminal member and the elastic member. And a fixing material arranged as described above.

At this time, it is preferable that the elastic body is sandwiched between the plate member and any one of the external terminal member and the internal terminal member, and it is preferable that the positive electrode and the negative electrode are electrically insulated. In addition, as the elastic body, 1
It is preferable to have an electrical resistivity of 0 ¹⁰ Ω / cm or more, and it is preferable to use at least two types of packings having different hardnesses. When the elastic body is sandwiched between the plate-shaped member and any of the external terminal member and the internal terminal member, the amount of deformation of the elastic body pressed against the positive electrode in the pressure contact direction is larger than the springback amount, and It is preferable that the pressing force applied to the elastic body is not more than the magnitude of the force for maintaining the elastic body at an elastic maintenance rate of 95% or more. Also,
The elastic body is preferably any of ethylene polypropylene rubber, polyethylene, polypropylene, and fluororesin.

In the present invention, a part of the inner peripheral wall of the fixing material preferably has a gradient with respect to the outer peripheral wall of the terminal member, and the gradient is preferably 30 ° or less. Further, the hardness of the fixing material is preferably the same as or greater than the hardness of the terminal member. Specifically, the fixing material and the terminal member are formed of Al, an Al alloy,
It is preferably made of any of Cu, Cu alloy, brass, and stainless steel.

Further, in the present invention, it is preferable that the terminal member has a stopper structure for preventing a certain or more pressing force from being applied to the elastic body. Further, when the side on which the fixing material is disposed is set to the upper side with the center axis of the terminal member as an axis, the radius of the upper end of the terminal member is r ₁ (mm), and the upper end of the fixing material is When r ₂ (mm) is satisfied, it is preferable that r ₁ and r ₂ satisfy r ₁ > r ₂ . The difference between r ₁ (mm) and r ₂ (mm) is Δr
(Mm), Δr is Δr ≧ 0.2 mm
Is preferably satisfied.

When the side on which the fixing material is provided is positioned upward with reference to the position of the plate member with the center axis of the terminal member as an axis, it is preferable that the upper end of the terminal member protrudes from the upper end of the fixing material. . When the force for removing the press-fitted fixing material is M ₁ (ton) and the elastic force of the elastic body is M ₂ (ton), M ₁ and M ₂ satisfy the relationship of M ₁ > M _2. It is more preferable that M ₁ and M ₂ satisfy the relationship of M ₁ ≧ M ₂ × 2, and it is further preferable that M ₁ satisfies the relationship of M ₁ ≧ ₁ ton. Further, the upper end surface of the terminal member is preferably concave.

The structure of the lithium secondary battery of the present invention is as follows:
It is suitably adopted for a large battery having a battery capacity of 2 Ah or more.
Further, it is preferably used as an on-vehicle battery, and is suitably used as a power source for starting an engine requiring high output, a power source for driving a motor of an electric vehicle or a hybrid electric vehicle in which a large current is frequently discharged.

Further, according to the present invention, an internal electrode is formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein. Body, this internal electrode body is housed inside, a cylindrical battery case with both ends open, a plate-shaped member, an external terminal member,
And a lithium secondary cell comprising a plurality of lithium secondary cells having two electrode lids, wherein the internal electrode body is sealed at both open ends of the battery case. A connection structure, comprising: a positive electrode external terminal member of the lithium secondary cell of any of the plurality of lithium secondary cells; and a lithium secondary cell other than the lithium secondary cell having the positive electrode external terminal member. A connection structure for a lithium secondary cell, wherein the negative electrode external terminal member of the secondary cell is connected with a bus bar.

In the present invention, at least one of the electrode lids preferably has a pressure release hole, and the bus bar is preferably formed by joining so as not to close the pressure release hole. Further, the pressure release hole is disposed at a position corresponding to the center axis of the core, the center axis of the core is coaxial with the center axis of the battery case, the external terminal member has a hollow portion, It is a lithium secondary battery in which this hollow portion serves as a pressure release passage of a pressure release hole, and the bus bar preferably has a shape that does not block the hollow portion. Preferably, the bus bar and the external terminal member are joined by welding.

Further, according to the present invention, an internal electrode is formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein. Body, this internal electrode body is housed inside, a cylindrical battery case with both ends open, a plate-shaped member, an external terminal member,
Connection of a lithium secondary cell including a plurality of lithium secondary cells having bus terminals and an electrode cover sealing the internal electrode body at both open ends of the battery case having internal terminal members. In the structure, the bus bar and the external terminal member are joined by welding, and a welded portion between the bus bar and the external terminal member, and a welded portion between the external terminal member and the bus bar are made of the same metal. And a connection structure for a lithium secondary battery.

Further, according to the present invention, an internal electrode is formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein. Body, this internal electrode body is housed inside, a cylindrical battery case with both ends open, a plate-shaped member, an external terminal member,
Connection of a lithium secondary cell including a plurality of lithium secondary cells having bus terminals and an electrode cover sealing the internal electrode body at both open ends of the battery case having internal terminal members. A connection structure for a lithium secondary cell, wherein the bus bar and the external terminal member are joined by welding, and the bus bar and the external terminal member are formed of the same kind of metal. Body, is provided.

At this time, specifically, it is preferable that the external terminal members of the positive electrode and the negative electrode are made of Al or an Al alloy, and that the bus bar is mainly made of Al.
Alternatively, the external terminal members of the positive electrode and the negative electrode are made of Cu or C
u alloy, the bus bar is preferably made mainly of Cu, or the external terminal members of the positive electrode and the negative electrode are Ni or a Ni alloy, and the bus bar is
It is preferable that the main component is Ni.

Further, according to the present invention, an internal electrode is formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein. And a cylindrical battery case having both ends opened and a cylindrical battery case accommodating the internal electrode body therein, and an electrode in which the internal electrode body is sealed at both open ends of the battery case having a pressure release hole on at least one side. A connection structure for a lithium secondary battery including a plurality of lithium secondary batteries each having a lid, wherein the electrode lid seals the internal electrode body, and both ends of the battery case are open. A plate-shaped member arranged to hermetically seal, an external terminal member protruding above the surface of the electrode cover for leading out a current to the outside, and taking out a current from the internal electrode body, connecting to the internal electrode body. Internal terminal member, and the plate-shaped member , The external terminal member, and at least two of the internal terminal member are joined, the pressure relief hole is disposed at a position corresponding to the central axis of the core, the central axis of the core, the A lithium secondary battery coaxial with a central axis of a battery case, wherein the external terminal member has a hollow portion, and the hollow portion serves as a pressure release passage of the pressure release hole; The positive electrode external terminal member of any of the lithium secondary cells of the battery, and the negative electrode external terminal member of the lithium secondary cell other than the lithium secondary cell having the positive electrode external terminal member, with a bus bar And a connection structure for a lithium secondary battery, wherein the connection structure is connected.

The connection structure for a lithium secondary battery of the present invention is suitably employed in the case of a large battery having a lithium secondary battery having a battery capacity of 2 Ah or more. Further, when the lithium secondary cell is a vehicle-mounted battery, it is suitably adopted,
It is suitably used as a connection structure for a lithium secondary battery such as a power supply for starting an engine that requires a high output or a power supply for driving a motor of an electric vehicle or a hybrid electric vehicle that frequently discharges a large current.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION The lithium secondary battery of the present invention is roughly classified into first to seventh inventions. The first to third inventions relate to a lithium secondary battery, and the fourth to seventh inventions relate to a connection structure of a lithium secondary battery. Hereinafter, embodiments of the present invention will be described for each invention, but it goes without saying that the present invention is not limited to the following embodiments.

The lithium secondary cell of the first invention in the present invention is configured by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and has non-aqueous water therein. An internal electrode body impregnated with an electrolytic solution, a cylindrical battery case containing the internal electrode body inside and having both ends opened, and the internal electrode body sealed at both open ends of the battery case; A lithium secondary battery having an electrode cover, wherein the electrode cover seals the internal electrode body, and a plate-shaped member disposed to seal open both ends of the battery case; An external terminal member protruding above the surface of the electrode lid, and extracting an electric current from the internal electrode body, including an internal terminal member connected to the internal electrode body, and the plate-shaped member, The number of the external terminal members and the number of the internal terminal members are small. Both are configured to be joined. In this case, it is preferable that at least one of the plate member, the external terminal member, and the internal terminal member is formed by press working or cold forging. Since each member constituting the electrode cover of the present invention has a simple structure, each member can be manufactured easily and inexpensively by using these processes.

With respect to the lithium secondary battery according to the present invention, the configuration of the main part thereof will be described with reference to FIGS. 1 and 2.
explain.

The configuration of the lithium secondary battery according to the present invention is, as schematically shown in FIG.
An inner electrode body 1 formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of the inner electrode body 3 and impregnated with a non-aqueous electrolyte therein, and both ends containing the inner electrode body 1 therein The battery case 24 having a cylindrical shape and the battery case 2
And an electrode lid sealing the internal electrode body 1 at both open ends. In producing the lithium secondary cell 14, first, the positive electrode current collecting tab 5A and the negative electrode current collecting tab 5B attached to both ends of the internal electrode body 1 are connected to the positive electrode internal terminal 22A and the negative electrode internal terminal 22B, respectively. . Here, the internal terminal refers to a member that collectively connects the current collecting tabs inside the battery, and includes a positive electrode current collecting tab 5.
The positive electrode internal terminal 22A connecting A is preferably made of aluminum or an aluminum alloy, and the negative electrode internal terminal 22B connecting the negative electrode current collecting tab 5B is preferably made of copper or a copper alloy, or nickel or a nickel alloy. Used for In addition, a material obtained by plating Ni, such as aluminum, copper, iron, or SUS, can be suitably used for the internal terminal member.

The internal terminal member 11 A shown in FIG.
As an example, a rivet-shaped one in which a current collecting tab is crimped and connected is illustrated, but the shape is not limited. Also,
Since aluminum and copper easily form an oxide film on the surface thereof, the oxide film may increase the contact resistance between the current collecting tab and the internal terminal member, and the value may vary. Therefore, in order to suppress the variation in the contact resistance at the connection portion, it is preferable that the collective connection of the current collecting tab to the internal terminal member 11A is performed by welding.

In addition, the internal terminal members may be respectively attached to the plate-shaped members in advance, and the plate-shaped members may have external end members attached to different surfaces on which the internal terminal members are provided. preferable. Here, the plate member is
It is a member for sealing the internal electrode body, and the material is preferably the same metal material as the internal terminal, such as aluminum, copper, or Ni.
Those subjected to i-plating can also be suitably used. The external terminal member is a terminal member for extracting a current to the outside of the battery, and the material is not particularly limited as long as it is a solid metal material. The external terminal member having the structure as illustrated in FIG. 1 enables a plurality of batteries 14 to be connected in series easily and firmly so as to reduce the contact resistance.

In order to take advantage of such features, the internal terminal member and the plate-shaped member, and the plate-shaped member and the external terminal member, are firmly joined to each other by welding so that the contact resistance is reduced. Is preferred. When the plate-like member is made of a metal material as described above, the internal terminal member and the external terminal member necessarily conduct to form a current path. In this case, the structure of the battery end is simplified, and the workability of assembling the battery is improved.

The batteries 14 shown in FIGS. 1 and 2 have the same basic structure and the same material used for each member, and the features of each battery are the difference in the method of sealing the battery and the structure of the electrode lid associated therewith. is there. The battery 14 shown in FIG.
Are provided, the packing 17 is sandwiched between the battery case 24 and the electrode lid, and the battery 14 is sealed by caulking. On the other hand, the battery 14 of FIG.
Similarly to 4, the drawn portion 21 is provided immediately below the electrode cover, but the battery case 24 and the electrode cover are disposed so as to be in direct contact with each other. The battery is sealed. This welding 34
Is preferably formed on the entire periphery of the outer periphery of the electrode lid and the tip of the battery case 24.

In other words, the battery 14 shown in FIGS. 1 and 2 is provided with a drawing portion 21 immediately below the electrode cover, thereby positioning and fixing the electrode cover in the battery. And crimp the electrode lid,
Alternatively, the battery case 24 and the electrode lid are caulked and welded without sandwiching the packing 17, thereby sealing the batteries. Since the lithium secondary cell of the present invention is considered to be mounted on an electric vehicle or the like as its application, it requires high output, low internal resistance, and retention during operation or for a long period of time. Battery 14 of FIG.
Is a sealing method by drawing and caulking,
By selecting an appropriate packing material and applying an appropriate caulking stress, the battery has sufficient long-term retention as a vehicle-mounted battery. The battery 14 in FIG. 2 can disperse stress such as vibration that can be applied to the lithium secondary battery by drawing and caulking and further welding. The seal can be maintained for a long time against the vibrations always applied to the motor.

Further, in the lithium secondary battery according to the present invention, a metal material is used for the internal terminal member, the plate-shaped member, and the external terminal member that constitute the electrode lid. Is used. For this reason, it is necessary to insulate somewhere between the positive electrode and the negative electrode in order to prevent the current from being short-circuited. The battery 14 in FIG. 1 is insulated by sandwiching a gas-tight packing 17 between both ends of the positive and negative electrode lids. In the battery 14 shown in FIG. 2, since the electrode cover and the battery case 24 are in contact with each other to form a current path, the negative electrode cover 15B (corresponding to a plate-like member) and the negative electrode internal terminal 22B (corresponding to an internal terminal member) are provided. ) And a negative electrode external terminal 16B (corresponding to an external terminal member) to interpose a packing 17 that does not allow current to flow, thereby achieving insulation.

In the first invention, at least two of the plate-like member, the external terminal member, and the internal terminal member are provided.
Preferably, the one is made by one or more methods selected from the group consisting of friction welding, brazing, welding, caulking, and forging caulking. Among these, it is particularly preferable to join the electrode lids by welding in order to reduce the internal resistance. The electrode cover is a concept that naturally includes both the positive electrode electrode cover and the negative electrode cover.

Further, in the lithium secondary battery of the first invention, as shown in FIGS. 1 and 2, at least one of the electrode lids has a pressure release hole at a position corresponding to the center axis of the core. Is preferred. At this time, the center axis of the core is preferably coaxial with the center axis of the battery case, and the external terminal member has a hollow portion, and the hollow portion preferably serves as a pressure release passage of a pressure release hole. .

In a lithium secondary cell, usually,
The internal electrode body is disposed at the center of the battery. When a cylindrical internal electrode body is used, the center axis of the winding core is inevitably located coaxially with the center axis of the battery case. In this case,
When the pressure release hole is provided at a position corresponding to the center axis of the winding core, the pressure release hole can take a structure easily integrated with the external terminal member as shown in FIGS. 1 and 2. become able to. In order to integrate the external terminal member and the pressure release hole 18, it is necessary to realize a simple and pressure-release operable structure so that the pressure release valve provided in the pressure release hole 18 fits in the external terminal member. . The present invention achieves this, and simplifies the electrode cover structure as a whole.

In this way, the internal electrode body 1 to which the plate member or the like is attached is inserted into the cylindrical battery case 24. As the battery case 24, a metal pipe is preferably used, and an aluminum pipe or a stainless steel pipe is preferably used. As described above, since the metal member is used as the battery case 24, the insulating polymer film 23 is placed between the inner surface of the battery case 24 and the outer periphery of the internal electrode body 1.
To prevent conduction between the internal electrode body 1 and the battery case 24 and between the current collecting tabs 5A and 5B and the battery case 24. However, when the entire outer periphery of the internal electrode body 1 is covered with the separator 4, the internal electrode body 1
The insulating polymer film 23 is not always necessary in the outer peripheral portion of the above.

Regardless of the mode of use of the insulating polymer film 23, in order to suppress the movement of the internal electrode body 1 in the radial direction, the outer periphery of the internal electrode body 1 is set to such an extent that the insertion of the internal electrode body 1 is not difficult. Preferably, the clearance with the inner surface of the battery case 24 is reduced, and more preferably, the internal electrode body 1 is designed to receive compressive stress from the battery case 24 after completion of the battery.

Thus, the internal electrode body 1 is connected to the battery case 2
4, near the end face of the internal electrode body 1,
Between the electrode cover and the current collector tabs 5A and 5B and the core 13
In consideration of the length, a drawing process is performed on the battery case 24 to form a drawn portion 21 protruding inward. The formation of the drawn portion 21 facilitates the fixing of the electrode lid and also plays an auxiliary role of suppressing the movement of the internal electrode body 1 in the length direction. The position where the drawn portion 21 is formed plays an important role in determining the fixed position of the electrode cover.

Next, the above-described electrode lid will be described in more detail. FIG. 3 is an example of an electrode cover in which a part of the structure of the battery shown in FIG. 1 is enlarged, and includes an L-shaped external terminal member 26A, a plate-shaped member 25A having a hollow hole in a central portion,
And internal terminal member 11A for connecting current collecting tab 5 by crimping
It consists of. Since these members have a simple shape, they can be easily formed by press working, and if the respective members are joined, it is very easy to produce an electrode lid having the necessary functions described above. You can do it.

Another embodiment of the electrode lid is shown in FIG. This electrode lid is composed of an external terminal member 26B that is vertically upright on the plate member 25B and has a hollow center, and a member in which the internal terminal member 11B and the plate member are integrated, and the two members are joined. It is produced by doing. Like the electrode lid of FIG. 3, it is a member having a simple shape, and can be easily formed by press working.

As described above, without using many parts,
The manufacturing process using only press molding, welding, or the like can reduce the manufacturing cost of the lithium secondary battery because the manufacturing cost is low and the yield is good. In addition, since the electrode lid of the present invention is composed of a small number of parts, the weight of the lithium secondary battery can be reduced. And it is thought that it leads to prolongation of battery life.

In general, in a lithium secondary battery, when the battery temperature rises due to overcharging or overdischarging, the electrolyte evaporates and the battery internal pressure rises, thereby preventing the battery from exploding. A pressure relief valve is provided at the end of the battery as a safety mechanism. In the lithium secondary cell using the electrode lid shown in FIG. 3, when the internal pressure rises, the lid comes off and the pressure is released. In that case, the pressure can be adjusted depending on the degree of caulking with the battery case containing the internal electrode body. In the lithium secondary battery using the electrode lid shown in FIG.
Is hollow, so that a metal foil 19 / elastic body 17 /
The pressure relief valve structure having the configuration of the metal spacer 27 may be used. In this manner, the metal foil 1 is closed so as to close the cavity.
When the battery 9 is press-fitted with the metal spacer 27 or the like and attached, the metal foil 19 is released to the atmospheric pressure because only the metal foil 19 bursts when the battery internal pressure increases.

Next, filling of the non-aqueous electrolyte in the lithium secondary battery will be described. In the lithium secondary battery using the electrode lid shown in FIG. 3, as shown in FIG. 15, in a state where only one of the battery cases is sealed, the battery case is placed under a reduced pressure atmosphere with the other opening on the upper side. ,
After the electrolyte is injected into the internal electrode body and the predetermined electrolyte is sufficiently impregnated into the internal electrode body, the unnecessary electrolyte is discharged under an inert gas atmosphere, and the opening is finally sealed. Performed by

In the lithium secondary battery using the electrode lid shown in FIGS. 4 and 5, the plate members 25B and 25C are hollow, and the core of the internal electrode body has a hollow cylindrical shape. As shown in FIG. 16, after sealing both ends of the battery case 24,
And the electrolyte injection nozzle 28 through the extension area 29 of the core
To the other end of the battery and injecting a non-aqueous electrolyte, and then the cavity is sealed with a metal foil or the like. This method is preferable because the filling of the electrolytic solution is performed easily and quickly. According to this method, the electrolyte injection port 30, which leads to leakage of the electrolyte and a decrease in airtightness, can be limited to a small area, and reliability can be improved. Of course,
The electrode cover in FIG. 3 can also change the central hollow portion of the plate-like member 25A to the same shape as the plate-like member in FIGS. 4 and 5, which is the same as the case of the electrode cover in FIGS. A pressure relief valve structure or an electrolyte injection method can be employed.

As described above, by using one member as a member having several functions, the electrode lid of the lithium secondary battery of the present invention shown in FIGS. 3, 4, and 5 can be simplified. Despite its shape, it has both a pressure release function and an electrolyte injection function.

The electrode lids of FIGS. 3, 4 and 5 described above are not particularly limited as to whether they are used for the positive electrode or the negative electrode. In the lithium secondary battery of the present invention, the pressure is released to the positive electrode side. Since the structure in which the holes are provided is adopted, the electrode lid structures of FIGS. 3, 4, and 5 are used for the positive electrode lid.

Next, an electrode lid having a function different from that described above with reference to FIGS. 6, 7, 8, and 9 will be described. There is no particular limitation on whether these electrode lids are used for the positive electrode or the negative electrode. In the present invention, a battery structure in which the battery case 24 and the electrode lid are welded as shown in FIG. In this case, it is necessary to insulate the current inside the electrode cover, and it is necessary to provide one of the positive and negative electrode covers with an insulating function. In the battery 14 of FIG. 2, since the positive electrode cover 15A has a pressure release function, the negative electrode employs an electrode cover having an insulating function.

FIG. 6 shows an external terminal member 2 made of an Al material.
6D and an internal terminal member 11D made of a Cu material that is connected by crimping to connect the current collecting tab with a packing 17 that does not conduct electricity interposed therebetween, and the plate 17 is fixed by the packing 17. I have.

As described later, the lithium secondary battery of the present invention is considered to be connected to each other using a bus bar to form a connection structure of the lithium secondary battery. In this case, considering the connection resistance of the current, FIG.
As shown in (1), the connected positive external terminal 16A, negative external terminal 16B, and busbar 32 are preferably made of the same material. For example, the positive external terminal 16A is connected to A
In the case of using 1 material, it is preferable that the negative electrode external terminal 16B and the bus bar 32 are also made of Al material. Even in this case, the negative electrode internal terminal 16B needs to be made of Cu material or Ni material due to the negative electrode electric reaction.

Therefore, as shown in the electrode lid of FIG. 6, the external terminal member (Al material) and the internal terminal member (Cu material) are made of different materials, and a current is led to the outside by joining them to each other. By adopting a structure in which the plate-shaped member 25D in contact with the case is fixed by the packing 17 that does not allow current to flow, an electrode lid that can insulate electricity between the positive electrode and the negative electrode can be obtained.

Needless to say, the positive electrode external terminal member, the negative electrode external terminal member, and the bus bar to be connected can be made of a Cu material or a Ni material. In this case, the negative electrode side is an electrode cover of a type having a pressure release function that can use the same material for the external terminal member and the internal terminal member, and the positive electrode side is made of a Cu material or an external terminal member from the positive electrode electrochemical reaction. N
An electrode cover of a type having an insulating function in which an i material and an internal terminal member are joined by using a different material from an Al material would be appropriate.

FIG. 7 is a view similar to the embodiment shown in FIG. 6, using a plate-like member 25E on a thin plate, and using an external terminal member 26E made of Al material and an internal terminal member 11E made of Cu material as a packing 17 It is comprised by.
This embodiment is characterized in that the shape of the meshing between the external terminal member and the internal terminal member is devised, and the joint of the electrode lid is further strengthened by caulking and forging from the upper part of the external terminal member with a convex mold or the like. I do.

FIG. 8 uses a plate-like member 25 F on a thin plate as in the embodiment of FIG.
The same applies to the material of the inner terminal member 6F and the inner terminal member 11F.
Characterized in that it is further divided into crimping members. this is,
As compared with the case where the bonding with the internal terminal member and the press-fitting of the packing 17 are performed at the same time as shown in FIGS. In this case, it is preferable that the joining member and the pressure bonding member be fixed by welding 34 or an adhesive 31.

FIG. 9 is characterized in that the material is the same as that of the above-described embodiment, but a bulky single-plate-like member is used for the plate-like member 25G. This configuration can increase the contact area between the battery case and the electrode lid when welding the battery case and the electrode lid in a later battery manufacturing process, and can increase the vibration stress applied to the welding surface when the battery is mounted on a vehicle. Are dispersed, and improvement in long-term vibration resistance of the battery can be expected.

That is, the lithium secondary cell of the second invention is configured by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and has a non-aqueous electrolytic solution therein. A liquid-impregnated internal electrode body, a cylindrical battery case containing the internal electrode body therein, and having both ends opened, and an electrode lid sealing the internal electrode body at both open ends of the battery case. A rechargeable lithium secondary battery, wherein the electrode lid seals the internal electrode body, and a plate-shaped member disposed to seal both open ends of the battery case, and guides current to the outside. An external terminal member protruding above the surface of the electrode lid, an internal terminal member connected to the internal electrode body for extracting a current from the internal electrode body, and an elastic body, and the plate-shaped member, the external A terminal member, and at least two of the internal terminal members One is joined.

As the electrode lid, it is preferable that an elastic body is sandwiched between the plate-shaped member and each of the external terminal member and the internal terminal member, and the elastic body electrically connects the positive electrode and the negative electrode. Preferably insulated,
The electric resistivity of the elastic body is preferably 10 ¹⁰ Ω / cm or more. Thereby, the elastic body can insulate electricity between the plate-shaped member and the external terminal member and the internal terminal member, and can cut off electricity between the positive electrode and the negative electrode in the battery.

The elastic body is preferably at least two types of packings having different hardnesses. For example, in the electrode lid of FIG. 10, a relatively soft one is used on the lower side (inside of the battery), and a relatively hard one is used on the upper (fixed member side) L-shaped one. Specifically, it is preferable to use ethylene propylene rubber on the lower side and fluororesin on the upper side.
As the elastic body in this application, a soft one has a wide load-displacement region capable of maintaining the elasticity retention rate of 95% or more, and is easy to use as a packing. However, on the other hand, when an external force such as vibration is applied, the deformation increases.
As a result, the insulation distance maintained by the packing 17 greatly fluctuates between the terminal member 55B and the plate-like member 25I in FIG. 11, which will be most stressed when vibration or the like is applied to the external terminal member. However, it is preferable to use a hard L-shaped one for the upper packing so as not to cause a worst case short circuit. In addition, since it is important that the upper side is a stiff packing, there is no particular problem in using the stiff packing on the lower side. In addition, by using two types of packings having different load-displacement ranges for maintaining the elasticity maintenance ratio, it is possible to reduce the influence of the variation in the load and the displacement at the time of manufacturing on the elasticity maintenance ratio of the packing.

As shown in FIGS. 10 and 11, this elastic body uses a packing 17 which is an elastic body corresponding to the shapes of the plate member and the terminal member. The packing 17 is appropriately elastically deformed by caulking. I will show you. In press-fitting the fixing material, the amount of deformation of the pressed elastic body in the pressing direction is larger than the amount of springback, and the pressing force applied to the elastic body keeps the elastic body at an elastic maintenance rate of 95% or more. It is preferable that it is equal to or less than the magnitude of the force.

The springback amount is determined by gradually reducing the load while monitoring the displacement based on the position at which the fixed material has been press-fitted by the autograph, from the reference position when the load is completely released. Refers to the amount of displacement. Therefore,
If the amount of deformation of the elastic body in the load direction is larger than the amount of springback, no gap is generated even after the press-fitting is completed, thereby preventing leakage of the electrolyte.

The elasticity retention rate is, for example, 10
It is expressed as a change in thickness before and after stress application when a pressing stress is applied to an elastic body of mmφ × 7 mmφ × 1 mm using an autograph and the pressing stress is released after a predetermined time has elapsed. That is, assuming that the thickness of the elastic body before the stress application is A ₁ and the thickness of the elastic body after the stress application is B ₁ , the elastic maintenance ratio D is
D = B ₁ / A ₁ × 100

The elastic body is preferably any of ethylene polypropylene rubber, polyethylene, polypropylene, and fluororesin. From FIG. 12 (a) to FIG.
2 (d) shows the elasticity of various elastic bodies ((a) ethylene propylene rubber, (b) fluororesin, (c) polyethylene, (d) polypropylene) processed to an outer diameter of 10 mmφ x inner diameter of 7 mmφ x 1 mm. It is a graph which showed the rate and the amount of displacement in relation to the applied stress, and the shaded frame shown in each graph is a preferred range according to the present invention. That is, if the elasticity maintenance ratio is 95% or more, the elasticity is secured and the surface pressure is secured.

It is preferable that the external terminal member and the internal terminal member are formed using different metals. This takes into account the electrical reactions at the positive electrode and the negative electrode described in detail below. At this time, at least two of the plate-like member, the external terminal member, and the internal terminal member are manufactured by one or more methods selected from the group consisting of friction welding, brazing, welding, caulking, and forging caulking. It is preferred that This makes it possible to provide an electrode cover that is suitable for the electrical reaction between the positive electrode and the negative electrode and that is easy to manufacture.

Next, the third invention of the present invention will be described. The lithium secondary cell of the third invention of the present invention is configured by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and a non-aqueous electrolyte is provided therein. An impregnated internal electrode body, a cylindrical battery case having both ends opened and containing this internal electrode body inside,
A lithium secondary battery comprising: an electrode cover that seals the internal electrode body at both open ends of the battery case, wherein the electrode cover seals the internal electrode body. A plate-shaped member disposed so as to be sealed, and a terminal member connected to the internal electrode body and protruding above the surface of the electrode lid, for extracting a current from the internal electrode body and leading the current to the outside; And elasticity between the plate-like member and the external terminal member and between the plate-like member and the internal terminal member for absorbing the impact of pressure contact between the plate-like member and the terminal member. A body, and a fixing material that fixes the plate-shaped member, the terminal member, and the elastic body at a predetermined position, and that is provided so as to press-contact the plate-shaped member, the terminal member, and the elastic body. Configuration. This is an invention in which a component called a fixing material is added to the electrode cover of the second invention as shown in FIGS. 10 and 11, but by using such a fixing material, the assembly of the electrode cover can be more easily performed. Can be done. In the case of the present invention, the following configuration is preferable.

The elastic body electrically insulates the positive electrode and the negative electrode.
Preferably 10 ^TenΩ / cm or more electrical resistivity
It is preferable to have one. Thereby, said
The elastic body is between the plate member and the external terminal member and the internal terminal member.
Of the battery, the positive and negative electrodes of the battery
It becomes possible to cut off the electricity of the pole. Also, elastic body
Are at least two types of packing with different hardness.
Is preferred. For example, in FIG.
Use a relatively soft material for the side
A side that is relatively rigid is used for the L-shape. concrete
Has ethylene propylene rubber on the bottom and fluorine on the top
It is preferable to use a resin. As an elastic body in this application
, The elasticity retention rate is maintained at 95% or more for soft ones
Wide load-displacement range and easy to use as packing
No. However, on the other hand, when external force such as vibration is applied
Is large in deformation. Due to this, vibrations etc.
Figure that would be most stressed when applied to a child member
11 between the terminal member and the plate member by packing
The maintained insulation distance fluctuates greatly, causing a short circuit.
Use a hard L-shaped one for the upper packing so that
Is preferred. Make sure that the upper side is
Use solid packing on the bottom side
Is not a problem. In addition, the load for maintaining the elasticity retention rate-
By using two types of packing with different displacement ranges,
Variations in load and displacement during manufacturing affect the elasticity maintenance rate of the packing
The effect can be reduced.

As shown in FIGS. 10 and 11, this elastic body uses a packing which is an elastic body corresponding to the shape of the plate-like member and the terminal member, and this packing shows moderate elastic deformation by caulking. To go. In press-fitting the fixing material, the amount of deformation of the pressed elastic body in the pressing direction is larger than the amount of springback, and the pressing force applied to the elastic body is a force that maintains the elastic body at an elastic maintenance rate of 95% or more. Is preferably equal to or less than the size.

The amount of springback is determined by gradually reducing the load while monitoring the displacement based on the position at which the fixed material has been press-fitted by the autograph, from the reference position when the load is completely released. Refers to the amount of displacement. Therefore,
If the amount of deformation of the elastic body in the load direction is larger than the amount of springback, no gap is generated even after the press-fitting is completed, thereby preventing leakage of the electrolyte.

The elasticity retention rate is, for example, 10
It is expressed as a change in thickness before and after stress application when a pressing stress is applied to an elastic body of mmφ × 7 mmφ × 1 mm using an autograph and the pressing stress is released after a predetermined time has elapsed. That is, assuming that the thickness of the elastic body before the stress application is A ₁ and the thickness of the elastic body after the stress application is B ₁ , the elastic maintenance ratio D is
D = B ₁ / A ₁ × 100

The elastic body is preferably any of ethylene polypropylene rubber, polyethylene, polypropylene, and fluororesin. From FIG. 12 (a) to FIG.
2 (d) shows the elasticity of various elastic bodies ((a) ethylene propylene rubber, (b) fluororesin, (c) polyethylene, (d) polypropylene) processed to an outer diameter of 10 mmφ x inner diameter of 7 mmφ x 1 mm. It is a graph which showed the rate and the amount of displacement in relation to the applied stress, and the shaded frame shown in each graph is a preferred range according to the present invention. That is, if the elasticity maintenance ratio is 95% or more, the elasticity is secured and the surface pressure is secured.

In the third invention, it is preferable that a part of the inner peripheral wall of the fixing material has a gradient with respect to the outer peripheral wall of the terminal member. This deforms the terminal member by crushing the head to prevent the fixing member from coming off. By providing the gradient, it is possible to avoid local deformation only at the tip of the terminal member. In the case of local deformation, stress at the time of deformation is concentrated, and there is a possibility that problems such as material cracking may occur in the worst case. At this time, the gradient is preferably 30 ° or less. When the gradient is increased, the total amount of deformation (total volume of the portion to be deformed) is increased, which may cause a problem similar to the case where the deformation is localized. The gradient is preferably set to 30 ° or less from the balance between the local deformation and the deformation amount.

In the third aspect, the hardness of the fixing material is preferably equal to or greater than the hardness of the terminal member. For this reason, it is preferable that the hardness of the fixing member be the same or larger in order to prevent the deformation of the fixing member even when the head is deformed. Specifically, as the fixing material and the terminal member, Al, Al alloy, Cu, C
It is preferable to be made of any of u alloy, brass, and stainless steel. As a combination, the fixing material is Al alloy A
In the case of 5056, Al alloy A3003 was used for the terminal member. When the fixing material was Cu, Al was used for the terminal member.
It is preferable to use Cu for the terminal member when u, Cu for the terminal member when the fixing material is brass, and Cu for the terminal member when the fixing material is stainless steel. At this time, it is preferable that the terminal member has a stopper structure for not applying a certain or more pressing force to the elastic body.

Further, in the third invention, the radius of the upper end of the terminal member is defined assuming that the side on which the fixing material is disposed is on the basis of the position of the plate member with the central axis of the terminal member as the axis. Assuming that r ₁ (mm) and the inner diameter r ₂ (mm) of the upper end of the fixing material, r ₁ and r ₂ preferably satisfy r ₁ > r ₂ . At this time, the difference between r ₁ (mm) and r ₂ (mm) is Δ
When r (mm), Δr is Δr ≧ 0.2 m
It is preferable to satisfy the relationship of m. As a result, the fixing member is engaged with the terminal member, so that the strength of the combined electrode cover is increased.

Further, in the third invention, when the side on which the fixing material is provided is positioned upward with respect to the position of the plate-like member with respect to the center axis of the terminal member as an axis, the upper end of the terminal member is fixed. Preferably, it protrudes from the upper end of the material. In this case, it becomes easier to take out the current or to connect to another unit cell.

In the third invention, the press-fitting is performed.
The force to remove the fixing material is M₁(Ton), elasticity of elastic body
Power M_Two(Ton), M₁And M_TwoAnd M ₁> M
_TwoIs preferably satisfied. This allows the fixing material
The pressure welding of the material is stabilized. At this time, M₁And M_TwoWhen
Is M₁≧ M_TwoIt is preferable to satisfy the relationship of × 2. This
Is twice as strong as the elastic force of the elastic body.
Above this, the safety factor will be higher. Further, M
₁Is M₁It is preferable to satisfy the relationship of ≧ 1 ton.
Actually, the configuration (type of packing is described above) and the shape of FIG.
In the shape, the elastic force of the packing 17, ie, M_TwoIs about 500kg
Becomes M₁And M_TwoIn the relationship, M₁≧ M_Two× 2 relationship
Is preferably satisfied, M₁Is less than 1 ton
The above is preferred.

In the third invention, it is preferable that the upper end surface of the terminal member is concave. As shown in FIG. 11, when the upper end surface of the terminal member 55 </ b> B is concave, a unit cell using this electrode cover can be more easily fixed when connecting another unit cell using, for example, a bus bar. Become.

The electrode lids of the lithium secondary battery of the present invention are shown in FIGS. 3 to 11 as specific examples, but they can all be completed as a single unit by combining the components of the electrode lids. it can. That is, with the electrode cover structure of the present invention, the electrode cover can be separately manufactured as a single component. Therefore, the electrode lid completed as one part can be easily joined to the internal electrode body to form a battery element,
By directly inserting and sealing in the battery case, a lithium secondary cell can be completed. As described above, sealing the completed electrode lid, which already has a function as an electrode lid and having undergone quality check, using the battery case and the above-described structure can be manufactured in a small number of steps, thereby reducing the manufacturing cost. And problems such as electrolyte leakage can be significantly suppressed.

Although the embodiment of the lithium secondary battery of the present invention has been described above, it is needless to say that the present invention is not limited to the above embodiment. Such a configuration condition of the lithium secondary battery of the present invention is suitably adopted for a battery having a battery capacity of 2 Ah or more. Also,
It goes without saying that the use of the battery is not limited, but as a large-capacity battery for vehicles requiring high output, low internal resistance and excellent cycle characteristics, it can be used for engine starting, electric vehicles or hybrid electric vehicles. It can be particularly suitably used for driving motors of automobiles.

The connection structure for a lithium secondary battery according to the fourth invention of the present invention is configured by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical winding core, and It has an internal electrode body impregnated with a non-aqueous electrolyte, a cylindrical battery case containing the internal electrode body inside, both ends of which are open, a plate member, an external terminal member, and an internal terminal member. A connection structure of a lithium secondary cell including a plurality of lithium secondary cells having two electrode lids and sealing the internal electrode body at both open ends of the battery case, A positive electrode external terminal member of any one of the plurality of lithium secondary cells and the negative electrode outside of the lithium secondary cell other than the lithium secondary cell having the positive electrode external terminal member Connect the terminal member to the busbar Connected. Here, as shown in FIGS. 18 and 19, the “bus bar” connects one positive electrode external terminal member of a lithium secondary cell to a negative electrode external terminal member of another lithium secondary cell. A metal material having good conductivity and low connection resistance with an external terminal member is used, and a punching metal or mesh (net) can be suitably used as the shape.

By using this connection structure, the unit cells 14 can be stacked and housed vertically and horizontally as shown in FIG. The battery 14 can be stored compactly.

In the fourth invention, it is preferable that at least one of the electrode covers includes a lithium secondary battery having a pressure release hole, and the bus bar is formed by joining the pressure release hole so as not to block the pressure release hole. . Specifically, the pressure relief hole is disposed at a position corresponding to the center axis of the core, and the center axis of the core is
When adopting a lithium secondary battery that is coaxial with the central axis of the battery case, the external terminal member has a hollow portion, and this hollow portion serves as a pressure release passage of a pressure release hole, a bus bar is used.
It is preferable to have a shape that does not block the hollow portion. That is, as shown in FIG. 18, by providing the bus bar 32 with a hollow portion so as not to close the hollow portion of the external terminal member and joining the bus bar 32, a simple bus bar connection structure without obstructing the pressure release function of the cell 14. Can be realized.

In the fourth invention, it is preferable that the bus bar and the external terminal member have a bus bar structure joined by welding. This allows
The connection resistance between the cells is reduced, the resistance of the entire connection structure can be suppressed, and a large output of the battery can be realized.

The connection structure for a lithium secondary battery according to the fifth invention of the present invention is configured by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and It has an internal electrode body impregnated with a non-aqueous electrolyte, a cylindrical battery case containing the internal electrode body inside, both ends of which are open, a plate member, an external terminal member, and an internal terminal member. A connection structure of a lithium secondary cell, comprising a plurality of lithium secondary cells connected by a bus bar, each having an electrode lid sealing the internal electrode body at both open ends of the battery case; And the external terminal member are joined by welding, and a welding portion of the bus bar to the external terminal member and a welding portion of the bus bar to the external terminal member are formed of the same metal. As a result, the connection resistance can be reduced, and the output of the connection structure of the lithium secondary battery increases.

A connection structure for a lithium secondary battery according to a sixth invention of the present invention is configured by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and It has an internal electrode body impregnated with a non-aqueous electrolyte, a cylindrical battery case containing the internal electrode body inside, both ends of which are open, a plate member, an external terminal member, and an internal terminal member. A lithium secondary cell having an electrode lid sealing the internal electrode body at both open ends of the battery case, and a connection structure of the lithium secondary cell formed by connecting a plurality of lithium secondary cells by bus bars; The terminal member and the bus bar are joined by welding the bus bar and the external terminal member, and the bus bar and the external terminal member are formed of the same metal. This is particularly preferable because the connection resistance can be reduced and the material configuration of the member is simple.

In the sixth invention, Al or an Al alloy is suitably used for the internal terminal member and the plate-like member on the positive electrode side. Al alloy, bus bar, Al
It is preferable to use one containing as a main component. Cu or a Cu alloy is preferably used for the internal terminal member and the plate member on the negative electrode side. According to this material, Cu or Cu alloy is used for the external terminal members of the positive electrode and the negative electrode, and a material containing Cu as a main component is used for the bus bar. Further, in the lithium secondary battery of the present invention, Ni or a Ni alloy is suitably used for the internal terminal member and the plate-shaped member on the negative electrode side. According to this material, Ni or a Ni alloy is used for the external terminal members of the positive electrode and the negative electrode, and a material containing Ni as a main component is used for the bus bar. Among these busbar materials, among those mainly containing Al, Cu or Ni, the higher the purity, the better the flow of electricity is, and the busbar is preferably used. However, Ni metal is Al, Cu
This is a somewhat expensive material as compared with the above, and is not preferable in terms of cost. Therefore, the external terminal members of the positive electrode and the negative electrode, the bus bar, Al, Cu, further,
It is also possible to use iron or SUS plated with Ni. Here, Ni or a Ni alloy or Ni as a main component refers to a concept including those plated with Ni. In this way, it is important to suppress the connection resistance by using as much as possible the external terminal member connected to the lithium secondary battery as the bus bar material.

The connection structure for a lithium secondary battery according to the seventh invention of the present invention is configured by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and An internal electrode body impregnated with a non-aqueous electrolyte, a cylindrical battery case containing the internal electrode body therein, and having both ends opened, and a battery case having at least one pressure release hole. A connection structure of a lithium secondary cell including a plurality of lithium secondary cells each including an electrode lid sealing the internal electrode body at both ends, wherein the electrode lid includes the internal electrode body. Sealing, a plate-shaped member arranged to seal both open ends of the battery case, and an external terminal member that derives current to the outside, protrudes on the surface of the electrode cover, and the internal electrode body. Take out the current, the inside connected to the internal electrode body And at least two of the plate-shaped member, the external terminal member, and the internal terminal member are joined, and the pressure relief hole is arranged at a position corresponding to a central axis of the core. A secondary axis, wherein the central axis of the core is coaxial with the central axis of the battery case, the external terminal member has a hollow portion, and the hollow portion serves as a pressure release passage of the pressure release hole. A positive electrode external terminal member of any one of the plurality of lithium secondary cells, and the lithium secondary cells other than the lithium secondary cell having the positive electrode external terminal member. The negative electrode external terminal member of the battery is connected to a bus bar. By using such a lithium secondary battery and a connection structure of the lithium secondary battery, it is possible to obtain a highly reliable lithium secondary battery capable of deriving a high output with a simple structure and a connection structure thereof. it can.

Although the embodiments of the connection structure for a lithium secondary battery of the present invention have been described above, it is needless to say that the present invention is not limited to the above embodiments. Such a configuration condition of the connection structure of the lithium secondary battery of the present invention is suitably adopted when the battery capacity of the lithium secondary battery is 2 Ah or more. Needless to say, the use of lithium secondary cells is not limited, but as a connection structure for in-vehicle large-capacity cells requiring high output, low internal resistance and excellent cycle characteristics. , For starting an engine, or for driving a motor of an electric vehicle or a hybrid electric vehicle.

[0094] The lithium secondary battery of the present invention uses an electrode cover as a battery sealing / current deriving member.
Therefore, there are no restrictions on other materials or battery structures.
Hereinafter, the main members constituting the battery and the structure thereof will be outlined.

The internal electrode body of the lithium secondary battery according to the present invention is formed by winding or winding the positive electrode plate and the negative electrode plate through a separator made of a porous polymer film so that the positive electrode plate and the negative electrode plate do not come into direct contact with each other. It is configured by lamination.
Specifically, the wound internal electrode body is formed by winding a positive electrode plate 2 and a negative electrode plate 3 with a separator 4 interposed therebetween, as shown in FIG. Current collecting tabs 5A and 5B are provided.

On the other hand, as shown in FIG. 14, the laminated internal electrode body is configured such that a positive electrode plate 8 and a negative electrode plate 9 are alternately laminated with a separator 10 interposed therebetween, and a positive electrode plate 2 and a negative electrode plate 3 are respectively provided. And a current collecting tab 6A for the negative electrode.

The positive electrode plates 2 and 8 and the negative electrode plates 3 and 9 are both formed in a thin plate shape by applying the respective electrode active materials to a current collecting substrate. Examples of the form of the current collecting substrate include foil and mesh. In the present invention, an aluminum foil is used as the current collecting substrate for the positive plates 2 and 8, and a copper foil is used as the current collecting substrate for the negative plates 3 and 9. And nickel foil are preferably used.

[0098] In any of the batteries having any of the above structures, generally, as a positive electrode active material, lithium cobalt oxide (LiCoO ₂ ) or lithium nickel oxide (L
iNiO ₂ ) or lithium manganate spinel (Li
For example, a lithium transition metal composite oxide such as Mn ₂ O ₄ ) is used. In addition, in order to improve the conductivity of these positive electrode active materials, it is also preferable to mix carbon powder such as acetylene black or graphite powder with the electrode active material. on the other hand,
As the negative electrode active material, an amorphous carbonaceous material such as soft carbon or hard carbon, or a carbonaceous powder such as natural graphite or artificial graphite is used.

As the separators 4 and 10, those having a three-layer structure in which a lithium ion permeable polyethylene film having micropores is sandwiched between porous lithium ion permeable polypropylene films are preferably used. When the temperature of the internal electrode body rises, the polyethylene film softens at about 130 ° C. and the micropores are crushed, which also serves as a safety mechanism for suppressing the movement of lithium ions, that is, the battery reaction. By sandwiching the polyethylene film between polypropylene films having a higher softening temperature, contact and welding between the electrode plates 2 and 3 and between the electrode plates 8 and 9 can be prevented.

[0100]

As described above, according to the lithium secondary battery of the present invention, the productivity can be improved by dividing the electrode lid according to function and using each of the members joined together. it can. Further, according to the connection structure of the lithium secondary battery of the present invention, by suppressing the connection resistance when connecting a plurality of cells, the output performance is improved, and by simplifying the structure, Productivity can be improved. As a result, the lithium secondary battery and the connection structure of the lithium secondary battery of the present invention have remarkable effects of improving productivity, output power, and reliability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a lithium secondary battery of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the lithium secondary battery of the present invention.

FIG. 3 is a perspective view showing an embodiment of an electrode cover having a pressure release function in the lithium secondary battery of the present invention.

FIG. 4 is a perspective view showing another embodiment of another electrode cover having a pressure release function in the lithium secondary battery of the present invention.

FIG. 5 is a perspective view showing an embodiment of yet another electrode lid having a pressure releasing function in the lithium secondary battery of the present invention.

FIG. 6 is a sectional view showing an embodiment of an electrode cover having an insulating function in the lithium secondary battery of the present invention.

FIG. 7 is a cross-sectional view showing one embodiment of another electrode cover having an insulating function in the lithium secondary battery of the present invention.

FIG. 8 is a cross-sectional view showing an embodiment of another electrode lid having an insulating function in the lithium secondary battery of the present invention.

FIG. 9 is a sectional view showing an embodiment of yet another electrode lid having an insulating function in the lithium secondary battery of the present invention.

FIG. 10 is a cross-sectional view showing one embodiment of an electrode cover using a fixing material in the lithium secondary battery of the present invention.

FIG. 11 is a cross-sectional view showing one embodiment of an electrode cover using another fixing material in the lithium secondary battery of the present invention.

FIG. 12 is a graph showing a relationship between an elastic maintenance ratio and a displacement amount for various elastic bodies.

FIG. 13 is a perspective view showing one embodiment of a structure of a wound internal electrode body.

FIG. 14 is a perspective view showing an embodiment of the structure of the laminated internal electrode body.

FIG. 15 is an explanatory diagram showing an example of a method for filling an electrolytic solution in a lithium secondary battery.

FIG. 16 is an explanatory view showing another example of a method for filling an electrolytic solution in a lithium secondary battery.

FIG. 17 is a cross-sectional view showing one embodiment of a conventional lithium secondary battery.

FIG. 18 is a cross-sectional view showing one embodiment of a connection structure for a lithium secondary battery of the present invention.

FIG. 19 is an explanatory view showing a bus bar connection state in a plurality of lithium secondary cells.

FIG. 20 is a schematic diagram showing a bus bar connection structure in a plurality of lithium secondary cells.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wound type electrode body, 2 ... Positive electrode plate, 3 ... Negative electrode plate, 4 ... Separator, 5A * 6A ... Positive current collecting tab, 5B * 6B ... Negative current collecting tab, 7 ... Laminated electrode body, 8 ... Positive electrode plate, 9 ... Negative electrode plate, 10 ... Separator, 11A / 11B / 11C / 1
1D, 11E, 11F, 11G: internal terminal members, 12:
Current extraction terminal, 13: winding core, 14: unit cell, 15A: positive electrode cover, 15B: negative electrode cover, 16A: positive electrode external terminal, 16B
... Negative electrode external terminal, 17 ... elastic body (packing), 18 ... Pressure release hole, 19 ... Metal foil, 20 ... Pressure release valve, 21 ... Drawing part, 22A ... Positive electrode internal terminal, 22B ... Negative electrode internal terminal, 2
3 ... insulating polymer film, 24 ... battery case, 25
A ・ 25B ・ 25C ・ 25D ・ 25E ・ 25F ・ 25G
・ 25H ・ 25I ... plate member, 26A ・ 26B ・ 26C
・ 26D ・ 26E ・ 26F ・ 26G ... External terminal member, 2
7 ... metal spacer, 28 ... injection nozzle, 29 ... exterior area of the core, 30 ... electrolyte inlet, 31 ... adhesive, 32 ... bus bar, 33 ... bus bar structure, 34 ... welding, 40 ... unit cell, 41 ... Electrode lead, 42 ... holding bracket, 43 ... nut, 44 ... bolt, 45 ... ceramic washer, 46 ...
Backup ring, 47 cap, 48 electrolyte inlet, 49 pressure relief valve, 50 pole, 51 core, 52 core
Insulator collar, 53 ... internal electrode body, 54 ... battery case,
55A / 55B: terminal member, 56A / 56B: fixing material.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01M 10/40 H01M 10/40 Z (72) Inventor Shinji Otsubo 2-56 Sudacho, Mizuho-ku, Nagoya-shi, Aichi Prefecture No. Insulator Co., Ltd. (72) Inventor Kennobu Kito 2-56, Sudacho, Mizuho-ku, Nagoya, Aichi Prefecture Inside of Insulators Co., Ltd. (72) Inventor Hiroshi Nemoto No. 2, Sudacho, Mizuho-ku, Nagoya, Aichi Prefecture 56 Japan Insulators Co., Ltd. (72) Inventor Toshihiro Yoshida 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi F-term in Japan Insulators Co., Ltd. 5H011 AA05 AA06 AA09 AA13 EE04 FF03 GG02 HH02 KK00 5H022 AA09 BB03 BB11 CC03 CC09 EE01 EE03 EE04 5H029 AJ11 AJ12 AJ14 AK00 AL00 AM01 BJ02 BJ14 BJ27 CJ03 CJ05 DJ02 DJ03 DJ05 EJ01 EJ12 HJ20

Claims (53)

[Claims] An internal electrode body comprising a positive electrode plate and a negative electrode plate wound and laminated on the outer peripheral wall of a hollow cylindrical core, and an internal electrode body impregnated with a non-aqueous electrolytic solution therein; A lithium secondary cell comprising a cylindrical battery case having both ends opened and a cylindrical battery case having both ends opened, and two electrode lids sealing the internal electrode body at the open ends of the battery case. Wherein the electrode lid seals the internal electrode body, and a plate-shaped member disposed to seal both open ends of the battery case; and And an internal terminal member connected to the internal electrode body for extracting a current from the internal electrode body, and at least one of the plate-shaped member, the external terminal member, and the internal terminal member. A two-piece joint Umm secondary single battery. 2. The lithium secondary according to claim 1, wherein at least one of the plate-shaped member, the external terminal member, and the internal terminal member is formed by press working or cold forging. Single cell. 3. The method according to claim 1, wherein at least two of the plate-shaped member, the external terminal member, and the internal terminal member are manufactured by one or more methods selected from the group consisting of friction welding, brazing, welding, caulking, and forging caulking. The lithium secondary battery according to claim 1, wherein the lithium secondary battery is a battery. 4. At least one of the electrode lids has a pressure release hole at a position corresponding to a central axis of the core.
4. The lithium secondary battery according to any one of items 3 to 5. 5. The lithium secondary battery according to claim 1, wherein a center axis of the core is coaxial with a center axis of the battery case. 6. The external terminal member has a hollow portion, and the hollow portion serves as a pressure release passage for the pressure release hole.
6. The lithium secondary cell according to any one of claims 5 to 5. 7. An internal electrode body formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein; A lithium secondary cell comprising a cylindrical battery case having both ends opened, and an electrode lid sealing the internal electrode body at both open ends of the battery case, An electrode cover for sealing the internal electrode body, a plate-shaped member arranged to seal both open ends of the battery case, and an external protruding surface on the electrode cover for leading a current to the outside A terminal member, an internal terminal member connected to the internal electrode body for extracting a current from the internal electrode body, and an elastic body; and at least two of the plate-shaped member, the external terminal member, and the internal terminal member Lich, characterized in that the two are joined Beam secondary single battery. 8. The lithium secondary battery according to claim 7, wherein the elastic body is sandwiched between the plate-shaped member and each of the external terminal member and the internal terminal member. 9. The lithium secondary battery according to claim 7, wherein the elastic body electrically insulates the positive electrode and the negative electrode. 10. The lithium secondary battery according to claim 7, wherein the elastic body has an electric resistivity of 10 ¹⁰ Ω / cm or more. 11. The method according to claim 7, wherein the elastic body is at least two kinds of packings having different hardnesses.
4. The lithium secondary battery according to item 3. 12. A force which causes the amount of deformation of the pressed elastic body in the pressing direction to be larger than the amount of springback, and that the pressing force applied to the elastic body maintains the elastic body at an elastic maintenance rate of 95% or more. The size is not more than the size of
The lithium secondary battery according to any one of the above items. 13. The lithium secondary battery according to claim 7, wherein the elastic body is any one of ethylene polypropylene rubber, polyethylene, polypropylene, and fluororesin. 14. The lithium secondary battery according to claim 7, wherein the external terminal member and the internal terminal member are formed using different metals. 15. The plate-shaped member, the external terminal member, and the internal terminal member are each made of Al, Cu, Ni, or an alloy thereof. At least two of the terminal members are friction bonded, brazed, welded,
The lithium secondary battery according to any one of claims 7 to 14, which is manufactured by one or more methods selected from the group consisting of caulking and forging caulking. 16. A caulking process in which the battery case and the electrode cover are formed by pressing a portion of the battery case in contact with the electrode cover and an outer edge portion of the electrode cover, and / or The lithium secondary battery according to any one of claims 7 to 15, wherein the end and the outer edge of the electrode lid are joined by welding. 17. An internal electrode body formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein; A lithium secondary cell comprising a cylindrical battery case having both ends opened, and an electrode lid sealing the internal electrode body at both open ends of the battery case, An electrode lid for sealing the internal electrode body, a plate-shaped member arranged to seal both open ends of the battery case, and taking out a current from the internal electrode body and leading the current to the outside; A terminal member connected to the internal electrode body, and protruding above the surface of the electrode lid; absorbing a shock of pressure contact between the plate member and the terminal member; Between, and between the plate member and the internal terminal member The clamped elastic body, and the plate-shaped member, the terminal member, and the fixing member, which fix the elastic member at a predetermined position, are disposed so as to press-contact the plate-shaped member, the terminal member, and the elastic member. A rechargeable lithium secondary battery comprising: 18. The lithium secondary battery according to claim 17, wherein the elastic body electrically insulates the positive electrode and the negative electrode. 19. The lithium secondary battery according to claim 17, wherein the elastic body has an electric resistivity of 10 ¹⁰ Ω / cm or more. 20. The lithium secondary battery according to claim 17, wherein the elastic body is at least two kinds of packings having different hardnesses. 21. A force in which the amount of deformation of the pressed elastic body in the pressing direction is greater than the amount of springback, and the pressing force applied to the elastic body maintains the elastic body at an elastic maintenance rate of 95% or more. The size is not more than the size of
0. The lithium secondary battery according to claim 1. 22. The lithium secondary battery according to claim 17, wherein the elastic body is any one of ethylene polypropylene rubber, polyethylene, polypropylene, and fluororesin. 23. The lithium secondary battery according to claim 17, wherein a part of the inner peripheral wall of the fixing material has a gradient with respect to the outer peripheral wall of the terminal member. 24. The lithium secondary battery according to claim 23, wherein the gradient is 30 ° or less. 25. The rechargeable lithium battery according to claim 17, wherein the hardness of the fixing material is equal to or greater than the hardness of the terminal member. 26. The fixing material and the terminal member, wherein A
26. The lithium secondary battery according to claim 17, wherein the lithium secondary battery is made of any one of 1, Al alloy, Cu, Cu alloy, brass and stainless steel. 27. The rechargeable lithium secondary battery according to claim 17, wherein the terminal member has a stopper structure for not applying a certain or more pressing force to the elastic body. 28. A front side centering on a center axis of the terminal member.
The side on which the fixing material is provided based on the position of the plate-like member
, The radius of the upper end of the terminal member is r ₁(M
m), inner diameter r of the upper end of the fixing material_Two(Mm)
Come, r₁And r_TwoAnd r₁> R_TwoClaim 17 which satisfies
Lithium rechargeable battery. 29. When the difference between r ₁ (mm) and r ₂ (mm) is Δr (mm), Δr is Δr ≧ 0.2
29. The lithium secondary battery according to claim 28, which satisfies the relationship of mm. 30. When the side on which the fixing material is disposed is positioned upward with respect to the position of the plate-like member with respect to the center axis of the terminal member as an axis, the upper end of the terminal member is formed of the fixing material. The lithium secondary battery according to claim 17 protruding from an upper end. 31. When the force for removing the press-fitted fixing material is M ₁ (ton) and the elastic force of the elastic body is M ₂ (ton), M ₁ and M ₂ are such that M ₁ > M ₂ The lithium secondary battery according to claim 17, which satisfies the following relationship: 32. The M ₁ and said M ₂ is, M ₁ ≧ M ₂ × 2
32. The lithium secondary battery according to claim 31, which satisfies the following relationship. 33. The lithium secondary battery according to claim 31, wherein M ₁ satisfies a relationship of M ₁ ≧ ₁ ton. 34. The lithium secondary cell according to claim 17, wherein an upper end surface of the terminal member is concave. 35. The battery according to claim 1, which has a capacity of 2 Ah or more.
35. The lithium secondary battery according to any one of 34. 36. The lithium secondary battery according to claim 1, which is for use in a vehicle. 37. The lithium secondary battery according to claim 36, which is used for starting an engine. 38. The lithium secondary battery according to claim 36, which is used for an electric vehicle or a hybrid electric vehicle. 39. An internal electrode body formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein; The body is housed inside, a cylindrical battery case having both ends opened, a plate-shaped member, an external terminal member, and an internal terminal member, wherein the internal electrode body is sealed at open ends of the battery case, A connection structure for a lithium secondary battery including a plurality of lithium secondary batteries each including two electrode lids, wherein the lithium secondary battery includes any one of a plurality of the lithium secondary batteries. A positive electrode external terminal member of a unit cell and the negative electrode external terminal member of the lithium secondary cell other than the lithium secondary cell having the positive electrode external terminal member are connected by a bus bar. Connection of lithium secondary battery Zotai. 40. The connection structure for a lithium secondary battery according to claim 39, wherein at least one of the electrode lids includes a lithium secondary battery having a pressure release hole. 41. The connection structure for a lithium secondary battery according to claim 39, wherein the bus bar is formed so as not to close the pressure release hole. 42. The pressure release hole is provided at a position corresponding to a center axis of the core, the center axis of the core is coaxial with the center axis of the battery case, and the external terminal member is 42. A lithium secondary battery having a hollow portion and using the hollow portion as a pressure release passage of the pressure release hole, wherein the bus bar has a shape that does not block the hollow portion. 13. The connection structure for a lithium secondary cell according to item 10. 43. The connection structure for a lithium secondary battery according to claim 39, wherein the bus bar and the external terminal member are joined by welding. 44. An internal electrode body formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein; An electrode having a cylindrical battery case having both ends opened, a plate-shaped member, an external terminal member, and an internal terminal member, in which the internal electrode body is sealed at both open ends of the battery case. A connection structure for a lithium secondary battery comprising a plurality of lithium secondary batteries each having a lid and connected by a bus bar, wherein the bus bar and the external terminal member are joined by welding, and the bus bar is provided. A connection structure for a lithium secondary battery, wherein a welded portion of the external terminal member and a welded portion of the external terminal member to the bus bar are made of the same metal. 45. An internal electrode body formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein; An electrode having a cylindrical battery case having both ends opened, a plate-shaped member, an external terminal member, and an internal terminal member, in which the internal electrode body is sealed at both open ends of the battery case. A connection structure for a lithium secondary battery comprising a plurality of lithium secondary batteries each having a lid and connected by a bus bar, wherein the bus bar and the external terminal member are joined by welding, and the bus bar is provided. A connection structure for a lithium secondary battery, wherein the and the external terminal member are made of the same kind of metal. 46. The connection structure for a lithium secondary battery according to claim 45, wherein the external terminal members of the positive electrode and the negative electrode are made of Al or an Al alloy, and the bus bar is mainly composed of Al. . 47. The connection structure for a lithium secondary cell according to claim 45, wherein the external terminal members of the positive electrode and the negative electrode are made of Cu or a Cu alloy, and the bus bar is mainly made of Cu. . 48. The connection structure for a lithium secondary battery according to claim 45, wherein the external terminal members of the positive electrode and the negative electrode are made of Ni or a Ni alloy, and the bus bar is mainly composed of Ni. . 49. An internal electrode body which is formed by winding and laminating a positive electrode plate and a negative electrode plate on the outer peripheral wall of a hollow cylindrical core, and impregnated with a non-aqueous electrolyte therein; A lithium battery including a cylindrical battery case having both ends opened, and a battery cover having at least one pressure-release hole, and an electrode lid sealing the internal electrode body at both open ends of the battery case. A connection structure for a lithium secondary battery formed by connecting a plurality of secondary cells, wherein the electrode cover seals the internal electrode assembly and seals both open ends of the battery case. Provided plate-shaped member, and an external terminal member that derives current to the outside, protrudes on the surface of the electrode cover, and extracts current from the internal electrode body, and an internal terminal member connected to the internal electrode body. And the plate-like member and the external terminal member And at least two of the internal terminal members are joined together, the pressure release hole is disposed at a position corresponding to a central axis of the core, and the central axis of the core is aligned with the central axis of the battery case. Coaxial, the external terminal member has a hollow portion, and the hollow portion is a lithium secondary cell serving as a pressure release passage of the pressure release hole; The positive electrode external terminal member of the lithium secondary cell and the negative electrode external terminal member of the lithium secondary cell other than the lithium secondary cell having the positive electrode external terminal member are connected by a bus bar. Characteristic connection structure for lithium secondary cells. 50. The connection structure for a lithium secondary battery according to any one of claims 39 to 49, wherein the lithium secondary battery has a capacity of 2 Ah or more. 51. The connection structure for a lithium secondary battery according to any one of claims 39 to 50, which is for use in a vehicle. 52. The connection structure for a lithium secondary battery according to claim 51, which is for starting an engine. 53. The connection structure for a lithium secondary battery according to claim 51, which is used for an electric vehicle or a hybrid electric vehicle.