JP2003338308A - Battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery achieving a longer service life without increasing manufacturing costs. <P>SOLUTION: A battery module comprises a battery jar composed of a case 22 of resin and a lid, and a power generation element including a layered electrode body. The power generation element is held inside the case 22. The power generation element includes electrode members 25a, 25d as an outermost electrode member located at the outermost periphery of the power generation element. The electrode members 25a, 25d each include a metal film. The respective metal films are exposed at the surfaces of the electrode members 25a, 25d located on the outer periphery sides of the power generation element, and the surfaces are in contact with the inside wall faces of the case 22. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery, and more particularly to a battery capable of achieving a long life.

[0002]

2. Description of the Related Art In recent years, an electric vehicle using an electric motor as a drive source and a so-called hybrid car having a plurality of types of drive sources such as an electric motor and a gasoline engine have been put into practical use. A battery for supplying electricity, which is energy, to an electric motor is mounted on such an electric vehicle. As this battery, a secondary battery such as a NiCd battery (Ni-Cd battery), a nickel-hydrogen battery, or a lithium-ion battery that can be repeatedly charged and discharged is used. As a structure of these batteries, a structure in which a power generating element including an electrode plate and the like is housed inside a battery case is used. As a material for the battery case, a resin is mainly used to ensure insulation. The battery case may have any shape such as a box shape or a cylindrical shape. As the structure of the power generation element, for example, a structure in which a plurality of electrode plates are laminated with a separator interposed therebetween is used. The electrolytic solution is impregnated or injected into the power generation element housed inside the battery case.

In the battery having such a structure, the water content of the electrolytic solution of the power generating element passes through the side wall of the resin-made battery case and diffuses to the outside of the battery to some extent. As a result, there is a problem that the life of the battery is shortened due to the decrease of the electrolytic solution inside the battery case.

In order to solve such problems, various battery structures have been conventionally proposed. For example, Japanese Patent Application Laid-Open No. 7-335183 discloses a lead storage battery in which an acid resistant metal foil is fixed and integrated with an adhesive on a wall surface inside a battery case. In JP-A-7-335183, by disposing the metal foil on the wall surface inside the battery case,
Since the metal foil has a shielding function of preventing moisture from permeating, it is possible to prevent moisture from escaping from the inside of the battery case to the outside through the side wall of the battery case.

[0005]

However, the above-mentioned Japanese Unexamined Patent Publication No.
In the technique disclosed in Japanese Patent Publication No. 335183-A, since it is necessary to perform a step of fixing a metal foil with an adhesive inside the battery case, the number of battery manufacturing steps increases. further,
Depending on the size and shape of the battery case, it may be difficult to fix the metal foil inside the battery case. As a result, there is a problem that the manufacturing cost of the battery increases.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a battery capable of achieving a long life without increasing the manufacturing cost. It is a thing.

[0007]

A battery according to the present invention comprises a resin battery case and a power generating element. The power generation element is held inside the battery case. The power generation element includes an outermost peripheral electrode member located on the outermost periphery of the power generation element. The outermost peripheral electrode member includes a metal film. The surface of the outermost peripheral electrode member located on the outer peripheral side of the power generation element is exposed to the metal film and is capable of contacting the inner wall surface of the battery case.

With this configuration, the metal film that hardly permeates moisture (that is, the metal film that acts as a moisture shield or a permeation preventing member) is placed in contact with the inner wall surface (inner wall surface) of the battery case. Therefore, it is possible to suppress the permeation and diffusion of water from the inside of the battery case to the outside of the battery case through the wall surface of the battery case in contact with the metal film. Therefore, the rate of decrease of the electrolytic solution of the power generation element arranged inside the battery case can be reduced, so that the life of the battery can be extended.

Further, since the metal film contained in the outermost peripheral electrode member constituting the power generation element is used as a moisture shield, it is not necessary to add a new member as a shield to the battery. Therefore, since the number of battery parts does not increase, it is possible to suppress an increase in battery manufacturing cost.

Further, since the metal film contained in the outermost peripheral electrode member is used as the shield, it is not necessary to perform the step of disposing another metal film acting as the shield on the inner wall surface of the battery case. . Therefore, the manufacturing process of the battery can be simplified, and an increase in the manufacturing cost of the battery can be suppressed.

In the above battery, the power generation element may include a plurality of electrode plates laminated with a separator interposed therebetween. The outermost peripheral electrode member may be an electrode plate located at the outermost end in the stacking direction of the stacked electrode plates.

In this case, the structure of the battery according to the present invention can be easily realized in the power generating element having the electrode assembly formed by stacking the electrode plates.

The battery according to the present invention includes a battery case made of resin, a power generating element, and a plate member. The power generation element is held inside the battery case. The plate-shaped member is arranged on the outer peripheral surface of the power generation element. The plate-shaped member contains a material different from the material forming the battery case. Furthermore, the plate-shaped member is connected to the power generation element. Then, in the plate-shaped member, the surface located on the side opposite to the surface facing the outer peripheral surface of the power generation element (that is, the surface facing the wall surface inside the battery case) is in contact with the wall surface inside the battery container.

With this configuration, the plate-shaped member can be made to act as a moisture shield by forming the plate-shaped member with a material having a lower moisture permeability than the material forming the battery case. Then, since the plate-shaped member is arranged in contact with the inner wall surface (inner wall surface) of the battery case, the plate-shaped member contacts the inner wall surface of the battery container through the wall surface of the battery container with which the plate member contacts. It is possible to suppress the permeation and diffusion of water to the outside. Therefore, it is possible to reduce the rate of decrease of the electrolytic solution of the power generation element arranged inside the battery case, so that the life of the battery can be extended.

Further, since the plate member is connected to the power generating element, the step of disposing the power generating element to which the plate member is connected inside the battery case allows the plate member to be simultaneously connected to the battery container. Can be placed inside. Therefore, it is not necessary to perform the step of disposing another member such as a metal film acting as a shield on the inner wall surface of the battery case separately from the step of disposing the power generation element inside the battery case. Therefore, the manufacturing process of the battery can be simplified, and an increase in the manufacturing cost of the battery can be suppressed.

Further, since the plate member and the power generating element are connected, the relative position of the plate member with respect to the power generating element can be fixed. Therefore, when a conductor such as a metal is used as the material of the plate-shaped member, it is possible to reduce the risk of a short circuit due to the plate-shaped member made of the conductor coming into contact with the positive electrode and the negative electrode of the power generation element.

In the above battery, the power generation element may include a plurality of electrode plates, a positive electrode current collector plate, and a negative electrode current collector plate. A plurality of electrode plates may be laminated via a separator. The positive electrode current collector plate may be connected to an electrode plate serving as a positive electrode among a plurality of electrode plates. Among the plurality of electrode plates, the negative electrode current collector plate may be alternately laminated with the electrode plate serving as the positive electrode and connected to the electrode plate serving as the negative electrode. The plate member is
Of the plurality of stacked electrode plates, the electrode plates may be arranged outside the outermost end electrode plate located at the outermost end in the stacking direction of the electrode plates. Further, the plate member may be connected to either one of the positive electrode current collector and the negative electrode current collector to which the above-mentioned endmost electrode plate is connected.

In this case, in the power generating element in which the laminated electrode plates are connected to the positive electrode current collector or the negative electrode current collector, the positive electrode current collector or the negative electrode current collector is used as a member for connecting the plate-like members. Available. In other words, by arranging a plate-shaped member on the outermost periphery of the laminated body of electrode plates, and connecting the plate-shaped member to the current collector to which the endmost electrode plate facing the plate-shaped member is connected, The power generating element that constitutes the battery according to the invention can be easily formed.

In the above battery, the plate member may be a metal film. In this case, since the metal film has a lower moisture permeability than the resin, the metal film can surely act as a moisture shield.

In the above battery, the metal film may be made of the same metal as the metal contained in the power generating element.

[0021] With this configuration, when a metal film is added to the power generation element as a moisture shield, the risk of the metal film adversely affecting the chemical reaction in the power generation element can be reduced.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts will be denoted by the same reference numerals and the description thereof will not be repeated.

(Embodiment 1) FIG. 1 is a schematic perspective view of a battery pack to which a battery module according to the present invention is applied. FIG. 2 is a block diagram of an automobile to which the battery pack shown in FIG. 1 is applied. FIG. 3 is a developed schematic view of the battery pack shown in FIG. FIG. 4 is a schematic perspective view of a battery module according to the present invention, which constitutes a module assembly which is a part of the battery pack shown in FIG. 1. FIG. 5 is a schematic partial sectional view taken along the line VV in FIG. 1 to 5
With reference to, a battery pack to which the battery module according to the present invention is applied will be described.

The battery pack 5 (see FIG. 1) including the battery module according to the present invention is applied to a battery system mounted on an automobile vehicle. As the battery system according to the present invention to which the battery pack 5 shown in FIG. 1 is applied, for example, the battery pack 5 shown in FIG. 1, a fan for supplying cooling air to the battery pack 5 and a cooling air are provided outside the vehicle. It may be provided with an exhaust duct for discharging to, a safety device used for maintenance of the battery system, and a battery computer for controlling the battery system.

Further, an automobile 1 (see FIG. 2) to which the battery system as described above is applied is, for example, as shown in FIG. 2, a control unit 2 and a battery unit 3 including the battery system according to the present invention.
And a drive unit 4. The control unit 2 controls the battery unit 3 and the driving unit 4. The drive unit 4 may include an internal combustion engine such as a gasoline engine or a diesel engine, in addition to an electric motor such as a motor driven by a current supplied from the battery unit 3. That is, the vehicle 1 is not only an electric vehicle that uses only an electric motor such as a motor that is driven by the current supplied from the battery unit 3 as a drive source, but also a so-called hybrid car that includes drive means other than an electric motor such as gasoline as a drive source. included.

As shown in FIG. 3, the battery pack 5 shown in FIG. 1 has a module assembly 11 inside a battery pack exterior member composed of a battery cover 6 and a lower case 12.
It has a structure that accommodates. Module assembly 11
Is formed by stacking a plurality of battery modules 17. In addition, a gap as a cooling air flow path is formed between the stacked battery modules 17 so that cooling air can flow. As the battery module 17, for example, a secondary battery such as a nickel-hydrogen battery can be used. The battery module 17 as a battery has a so-called rectangular flat plate shape.

As shown in FIG. 4, the battery module 17
Includes a plurality of battery cells 21a to 21f. Specifically, the battery module 17 includes a case 22 made of resin, a lid 23 made of resin arranged so as to close an opening formed in an upper portion of the case 22, the case 22 and the lid 2.
Six battery cells 21a to 21f arranged inside a module case as a battery case composed of 3 are provided. The battery cells 21a to 21f are arranged in the cell compartments partitioned by the partition wall 31 (see FIG. 5) inside the module case.

A terminal 16 is formed on the end face of the case 22 as the battery case in the long axis direction. On the side surface of the case 22, a protrusion 20 for forming a gap as a cooling air flow path between the battery modules 17 is formed. Module assembly 1 in which battery modules 17 are stacked
1 (see FIG. 3), the protrusions 20 of the adjacent battery modules 17 contact each other, so that the battery module 1
A gap is formed between 7. In addition, in FIG. 4, the exhaust terminal 1
5 (see FIG. 3) is omitted, and the battery cell 2
Case 22 and lid 23 to explain 1a-21f
It shows a state in which a part of is removed.

Battery cell 2 housed inside case 22
1a to 21f basically have the same structure. Here, the battery cell 21a will be described as an example. As shown in FIG. 5, the battery cell 21a includes a sheet-shaped negative electrode member 25a to 25d and a positive electrode member 2a.
6a to 26c are alternately laminated so as to be in an insulating state by the separator 27. Electrode member 25a-
Each of 25d and 26a to 26c includes a metal film. A paste 28 containing an active material is applied or filled between the electrode members 25a to 25d and 26a to 26c. Here, the electrode members 25a to 2 as the electrode plates
A laminated body of 5d, 26a to 26c and the separator 27 is referred to as a laminated electrode body 19 (see FIG. 4). Then, the pair of current collector plates 2 are sandwiched so as to sandwich the laminated electrode body 19 (see FIG. 4).
4a and 24b are arranged. A power generating element is composed of the laminated electrode body 19 and the current collecting plates 24a and 24b.

The end portions of the electrode members 25a to 25d serving as negative electrodes are connected to a current collector plate 24a as a negative electrode current collector plate. In addition, the electrode members 26a to 26 serving as positive electrodes
Each of c has a current collector plate 2 whose end is a positive electrode current collector plate.
4b is connected. As a result, all the negative electrode members 25a to 25d are electrically connected to the current collector plate 24a. Further, all the electrode members 26a to 26c, which are positive electrodes, are in a state of being electrically connected to the current collector plate 24b.

The electrode member 25 as the outermost peripheral electrode member located at the outermost periphery of the laminated electrode body 19 (see FIG. 4).
a and 25d, electrode members 26a and 26d,
The paste 28 containing the active material is applied or filled only on the surface facing c. Then, the electrode member 25a,
The paste 28 is applied to the surface of the surface of 25d that faces the side wall 32 of the case 22 (the surface that is located on the opposite side to the surface that faces the electrode members 26a and 26c and that is located on the outer peripheral side of the power generation element). Not done. As a result, of the electrode members 25a to 25d and 26a to 26c that are stacked, the electrode members 25a and 25d located at the end in the stacking direction that face the wall surface of the case 22 (the inner peripheral surface of the side wall 32). On the surface of, the metal film (metal foil) forming the electrode members 25a and 25d is exposed.

As the battery cell 21a is discharged or charged, the laminated electrode body 19 (see FIG. 4) made up of the electrode members 25a to 25d and 26a to 26c expands. Therefore, the exposed surface of the metal film of the electrode members 25a and 25d located on the outermost periphery of the laminated electrode body 19 is pressed against the side wall 32 of the case 22 as a resin battery case by the swelling of the laminated electrode body 19. To be done. Therefore, the exposed metal film of the electrode members 25a and 25d can be brought into close contact with the inner peripheral surface of the side wall 32 (wall surface inside the case 22) without using an adhesive or the like.

In this way, the side wall 32 of the case 22 is
The inner peripheral surface of may be covered with a metal film forming the electrode members 25a and 25d. The metal film has a lower moisture permeability than the resin forming the case 22, and acts as a moisture permeation preventing member. That is, the metal film forming the electrode members 25a and 25d can be used as a permeation preventive member for preventing moisture from permeating and diffusing from the inside of the case 22 through the side wall 32 of the case 22. As a result, moisture is removed from the inside of the case 22 to the case 2.
The battery module 17 (see FIG. 4) through the side wall 32 of 2.
It is possible to suppress divergence to the outside of. Therefore, the life of the battery can be improved.

Further, as described above, the electrode members 25a, 25d
Since the metal film constituting the is used as a permeation prevention member,
The battery cell 21 is provided with a new member that acts as a permeation preventing member.
No need to add to a. Therefore, while suppressing the structure of the battery cell 21a from being complicated, it is possible to suppress an increase in the manufacturing cost of the battery module 17 (see FIG. 4) and to suppress the permeation of water from the side wall 32 to the outside. it can.

Further, since the electrode members 25a and 25d are connected to the collector plate 24a, the laminated electrode body 19
(See FIG. 4) and collector plates 24a, 24b (See FIG. 5)
The battery cell 21a according to the present invention can be realized by performing the same process as that of the related art of inserting the inside of the case 22. That is, the side wall 32 of the case 22
The battery cell 21a is better than a method of arranging a metal foil independent of the laminated electrode body 19 (see FIG. 4) on the inner peripheral surface of No. 1 or plating a metal film on the surface of the inner wall of the side wall 32.
The manufacturing process of the battery module 17 (see FIG. 4) including can be simplified. Therefore, the battery module 1
7 (see FIG. 4) can be reduced in manufacturing cost.

In the battery module 17 shown in FIG. 4, for example, when the rated voltage of each of the battery cells 21a to 21f is 1.2V, the battery cells 21a to 2f.
Since 1f is electrically connected in series, the rated voltage of the entire battery module is 7.2V. Then, the battery module 17 having the battery cells 21a to 21f having the above-described structure is used in a state of being stacked as the module assembly 11 as shown in FIG. 3 as already described.

As shown in FIG. 3, in the battery pack according to the present invention, the constraining plates 10a and 10b are arranged at both ends of the module assembly 11. Restraint plate 10
The a and 10b are connected and fixed to each other by the restraint pipes 8a and 8b. The restraint plates 10a, 10
b is fixed to the lower case 12. The individual battery modules 17 are also fixed to the lower case 12.

On each side surface (end surface) of the battery module 17 constituting the module assembly 11, as described above, the battery cells 21a to 21a inside the battery module 17 are provided.
21 f (see FIG. 4) is formed with a terminal 16 for inputting / outputting a current. To connect the terminals 16 of the battery module 17 to each other, the bus bar modules 9a and 9b are arranged on the side surface of the module assembly 11. By connecting the bus bar modules 9a and 9b to the respective terminals 16 of the battery module 17, the battery modules 17 are electrically connected in series in the module assembly 11.

Further, on the upper surface of the module assembly 11, there is formed an exhaust terminal 15 having a built-in safety valve for discharging hydrogen gas exhausted from the battery module 17. On the exhaust terminal 15, an exhaust hose 7 connected to the exhaust terminal 15 and for discharging hydrogen gas or the like discharged from the battery module 17 to the outside of the battery pack 5 is installed. A temperature sensor 13 and a harness for measuring the temperature of the module assembly 11 are arranged on the upper surface of the module assembly 11.
In order to keep the temperature of the module assembly 11 within a predetermined range in accordance with the output of the temperature sensor 13, cooling air is supplied to the module assembly 11 by using a blower member such as a blower fan.

As a method of supplying the cooling air, as shown in FIG. 1, the cooling air is made to flow from the upper surface side to the lower surface side of the module assembly 11 (see FIG. 3) as shown by an arrow 14. Alternatively, the cooling air may flow from the direction opposite to the direction indicated by the arrow 14, that is, from the lower surface side of the module assembly 11 (see FIG. 3) to the upper surface side. Here, in the module assembly 11 as described above,
The protrusion 20 (see FIG. 4) formed on the side surface of the battery module 17 (see FIG. 4) forms a gap serving as a cooling air flow path between the adjacent battery modules 17.
Therefore, the cooling air passes through the gap between the battery modules 17 in the module assembly 11 and the module assembly 1
It can flow between the upper and lower surfaces of 1.

FIG. 6 is a schematic sectional view showing a modification of the first embodiment of the battery module according to the present invention. A modification of the first embodiment of the battery module according to the present invention will be described with reference to FIG. Note that FIG. 6 corresponds to FIG.

As shown in FIG. 6, the battery module 17
The battery cell 21a that constitutes (see FIG. 4) is basically the battery cell 21a in the battery system shown in FIGS.
a (see FIG. 5), but with a current collector 29
The shapes of a and 29b are different. Battery cell 21 shown in FIG.
In a, the side walls 33 are formed by bending the ends of the current collector plates 29a and 29b. That is, the current collector plate 29
The cross sections of a and 29b are U-shaped. Then, on the outer peripheral surface of the side wall 33 of the collector plate 29a, the electrode members 25a, 2
The end of 5d is fixed. Even in this way, FIG.
~ It is possible to obtain the same effect as the battery module constituting the battery system shown in FIG.

In the battery cell of the battery module shown in FIG. 6, the end portions of the current collector plate 29a are bent to form side walls 33 extending in substantially the same direction as the electrode members 25a and 25d. Has been done. Since the size of the portion of the collector plate 29a that should become the side wall 33 can be arbitrarily determined, the area of the side wall 33 can be made sufficiently large. It is relatively easy to connect and fix the ends of the electrode members 25a and 25b on the outer peripheral surface of the side wall 33 having such a sufficient area. For this reason,
The battery cell 21a can be manufactured more easily.

The material of the metal film forming the above-mentioned electrode members 25a and 25d is, for example, nickel (N
Materials such as i) and iron plated with nickel may be used. The thickness of the metal film is, for example, 0.005 mm or more and 0.1 mm or less, preferably 0.0
2 mm or more and 0.08 mm or less, more preferably 0.03
It can be set to not less than mm and not more than 0.07 mm.

(Embodiment 2) FIG. 7 is a schematic sectional view showing Embodiment 2 of the battery module according to the present invention.
Embodiment 2 of the battery module according to the present invention will be described with reference to FIG. Note that FIG. 7 corresponds to FIG.

As shown in FIG. 7, the battery cells 21a included in the battery module are basically the battery cells 21a of the battery module in the battery system shown in FIGS.
The electrode member 25a has the same structure as that shown in FIG.
25d, 26a to 26c, further outside the electrode members 25a and 25b located at the outermost periphery (as the outermost end electrode plate located at the outermost end in the stacking direction of the electrode members 25a to 25d and 26a to 26c). , Electrode members 25a-25
A metal plate 30 which is a member separate from the power generating element including the d, 26a to 26c and the current collecting plates 24a and 24b is arranged. The end of the metal plate 30 serving as a plate-shaped member has the electrode member 2
It is connected to a current collector plate 24a to which 5a and 25d are connected. The surface of the metal plate 30 located on the opposite side of the surface facing the electrode members 25 a and 25 d is in contact with the inner peripheral surface of the side wall 32 of the case 22.

Even in this case, the same effect as that of the battery cell shown in FIGS. 1 to 5 can be obtained. That is, since the metal plate 30 is disposed in close contact with the inner wall surface of the side wall 32 of the case 22, the battery cell 21 is disposed through the side wall 32.
Inside a (partitioned by a partition wall 31 in the case 22 as a battery case made of resin, electrode members 25a to 25d,
Laminated electrode body 19 including 26a to 26c (see FIG. 4)
Water can be suppressed from permeating to the outside of the case 22 and diverging from the cell chamber in which is arranged.

Further, since the metal plate 30 has its end connected to the collector plate 24a, the metal plate 30 can be handled integrally with the power generating element including the electrode members 25a to 25d and 26a to 26c. it can. Therefore, the metal plate 3
The metal plate 30 can be arranged on the inner peripheral surface of the side wall 32 by inserting the power generation element to which 0 is connected into the cell chamber inside the case 22.

Further, since the laminated electrode body 19 (see FIG. 4) composed of the electrode members 25a to 25d and 26a to 26c swells as the battery cells 21a are charged and discharged, the swelled laminated electrode body 19 causes the metal plate to swell. 30 is case 22
Is pressed against the side wall 32 of the. Therefore, the metal plate 30 can be closely attached to the inner peripheral surface of the side wall 32 without using an adhesive or the like.

Further, since the metal plate 30 as a plate member and the current collector plate 24a constituting the power generating element are connected,
The relative position of the metal plate 30 with respect to the power generation element can be fixed. Therefore, it is possible to reduce the risk that a short circuit occurs due to the metal plate 30 contacting both the positive electrode member 26c and the negative electrode member 25d of the power generation element. At this time, the metal plate 30 has substantially the same size as the electrode member 25d or a size smaller than the electrode plate 25d, and the end of the electrode plate 30 on the side of the current collecting plate 24b is the current collecting plate 24b or the electrode member. 26c is preferably arranged at a position not overlapping with 26c.

As the material of the metal plate 30, it is preferable to use the same metal as the metal film forming the electrode members 25a and 25d. By doing so, it is possible to reduce the risk that the metal plate 30 adversely affects the chemical reaction inside the battery cell 21a.

Further, instead of the metal plate 30, a plate-shaped member made of a material different from the material forming the case 22 and having a moisture permeability smaller than that of the material forming the case 22 may be used. . For example, instead of the metal plate 30,
A plate member made of a resin such as PPS (polyphenylene sulfide) may be used. Further, instead of the metal plate 30, a plate-shaped member in which a predetermined metal film is formed on the surface of a plate-shaped substrate by a plating method, or a laminated member in which a plurality of materials are laminated may be used. Also in this case, the same effect as when the metal plate 30 is used can be obtained.

As the material of the metal plate 30, for example, a nickel (Ni) material, iron plated with nickel, or the like can be used. The thickness of the metal plate 30 can be, for example, 0.005 mm or more and 0.1 mm or less, preferably 0.02 mm or more and 0.08 mm or less, and more preferably 0.03 mm or more and 0.07 mm or less.

FIG. 8 is a schematic sectional view showing a modification of the second embodiment of the battery module according to the present invention shown in FIG. A modification of the second embodiment of the battery module according to the present invention will be described with reference to FIG. Note that FIG. 8 corresponds to FIG. 7.

As shown in FIG. 8, the battery module 17
The battery cell 21a included in (see FIG. 4) basically has the same structure as the battery cell shown in FIG. 7, but the shapes of the current collectors 29a and 29b are different. That is, in the battery cell 21a shown in FIG. 8, the end portions of the current collector plates 29a and 29b are bent to form the side wall 33. The end of the metal plate 30 is connected and fixed to the outer peripheral surface of the side wall 33 of the current collector plate 29a.

In this way, by bending the end portion of the current collector plate 29a, the side wall 33 extending in substantially the same direction as the direction in which the metal plate 30 extends is formed, so the outer peripheral surface of the side wall 33 is formed. The work of fixing the end portion of the metal plate 30 on the top can be easily performed. As a result, the battery cell 21
The manufacturing process of a can be simplified.

In the first and second embodiments described above, a plurality of battery cells 21a to 21a are used as the battery according to the present invention.
Although the description has been given using the battery module 17 (see FIG. 4) including 1f (see FIG. 4), the present invention can be applied to batteries having shapes other than the battery module 17 as described above. For example, it can be applied to a battery composed of a single battery cell, an assembled battery in which single battery cells (single cells) are stacked or integrated, or the like.

It should be considered that the embodiments disclosed this time are exemplifications in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiments but by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

[0059]

As described above, according to the present invention, as the permeation preventive member arranged in contact with the inner peripheral surface of the battery case, the electrode constituting the power generating element or the plate-shaped member connected to the power generating element. Therefore, it is not necessary to carry out the step of adhering the permeation preventive member to the inner circumference of the battery case. Therefore, it is possible to obtain a battery capable of suppressing the diffusion of water from the inside of the battery case and extending the life of the battery without increasing the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a battery pack to which a battery cell according to the present invention is applied.

FIG. 2 is a block diagram of an automobile to which the battery pack shown in FIG. 1 is applied.

3 is a development schematic diagram of the battery pack shown in FIG. 1. FIG.

FIG. 4 is a schematic perspective view of a battery module according to the present invention which constitutes a module assembly which is a part of the battery pack shown in FIG.

5 is a schematic partial cross-sectional view taken along line VV in FIG.

FIG. 6 is a first embodiment of the battery module according to the present invention.
It is a cross-sectional schematic diagram which shows the modification.

FIG. 7 is a second embodiment of the battery module according to the present invention.
It is a cross-sectional schematic diagram which shows.

FIG. 8 is a schematic cross-sectional view showing a modified example of the second embodiment of the battery module according to the present invention shown in FIG.

[Explanation of symbols]

1 automobile, 2 control unit, 3 battery unit, 4 drive unit, 5
Battery pack, 6 battery cover, 7 exhaust hose,
8a, 8b restraint pipe, 9a, 9b busbar module, 10a, 10b restraint plate, 11 module assembly, 12 lower case, 13 temperature sensor, 14
Arrows, 15 exhaust terminals, 16 terminals, 17 battery modules, 19 laminated electrode bodies, 20 protrusions, 21a-2
1f battery cell, 22 case, 23 lid, 24a, 24
b, 29a, 29b Current collector, 25a to 25d, 26a
~ 26c electrode member, 27 separator, 28 paste, 30 metal plate, 31 partition wall, 32, 33 side wall.

Claims (6)

[Claims] 1. A battery case made of resin and a power generating element held inside the battery case, wherein the power generating element is located at the outermost circumference of the power generating element and includes a metal film. A battery including a surface of the outermost peripheral electrode member located on the outer peripheral side of the power generation element, the metal film being exposed and being capable of contacting a wall surface inside the battery case. 2. The power generating element includes a plurality of electrode plates stacked with a separator interposed therebetween, and the outermost peripheral electrode member is located at an outermost end of the stacked electrode plates in a stacking direction. The battery according to claim 1, wherein the battery is an electrode plate that does. 3. A battery case made of resin, a power generating element held inside the battery case, and a material arranged on the outer peripheral surface of the power generating element and different from the material forming the battery case, A battery comprising: a plate-like member that is connected to the power generating element and has a surface opposite to a surface facing the outer peripheral surface of the power generating element and in contact with a wall surface inside the battery case. 4. The power generating element includes: a plurality of electrode plates stacked with a separator interposed therebetween; a positive electrode current collector plate to which an electrode plate serving as a positive electrode of the plurality of electrode plates is connected; and the plurality of electrodes. Among the plates, including a negative electrode current collector plate in which the electrode plate serving as the positive electrode and the electrode plate serving as the negative electrode that are alternately stacked and connected to each other are connected, wherein the plate-shaped member is one of the stacked electrode plates.
Of the positive electrode current collector and the negative electrode current collector to which the outermost end electrode plate is connected, the outermost end electrode plate being located on the outermost end in the stacking direction of the electrode plates. The battery according to claim 3, which is connected to any one of the above. 5. The plate-shaped member is a metal film.
Or the battery according to 4. 6. The battery according to claim 5, wherein the metal film is made of the same metal as the metal included in the power generation element.