WO2011108680A1

WO2011108680A1 - Thin battery module and assembled battery using same

Info

Publication number: WO2011108680A1
Application number: PCT/JP2011/055013
Authority: WO
Inventors: 深沢保; 田中豊喜; 榎木泰史
Original assignee: 株式会社ピューズ; 大和製罐株式会社
Priority date: 2010-03-01
Filing date: 2011-02-25
Publication date: 2011-09-09
Also published as: JP5750097B2; CN102870252B; JPWO2011108680A1; TWI479723B; CN102870252A; TW201205927A

Abstract

Disclosed is a battery module wherein the electrode terminals of the battery module can be extremely easily connected, and furthermore, a bus bar for connecting the electrode terminals is not necessary when assembling the battery modules. An assembled battery using the battery modules is also provided. In the thin battery module, a plurality of cells (2, 2) are housed in a case (1), and the cells are stacked and electrically connected. In the upper and lower surfaces of the case (1), contact sections (11, 11) for inserting a connecting member (7) for electrical connection with the adjacent thin battery modules are formed. In the case (1) adjacent to each contact section (11), a contact section for power (60) electrically connected to the lead terminals (3, 4) of the cell (2) is provided. The contact section for power (60) has the connecting member (7) removably attached thereto.

Description

Thin battery module and assembled battery using the same

The present invention relates to a thin battery module configured using a plurality of laminate cells, and an assembled battery configured by assembling the thin battery modules. In the present specification, the laminate cell refers to a laminate type thin cell, and the cell is used to include a battery cell and a single battery.

As a thin battery module of this type, a structure in which a plurality of laminated cells are assembled, electrically connected in series and / or in parallel, and the periphery is covered with a resin member or a metal case is known. Yes. In addition, in order to drive a vehicle driving motor of an electric vehicle or a hybrid electric vehicle, a large amount of electric power is required. For example, an assembled battery having a specification of 100V or 350V is known. Furthermore, the assembled battery is also used for power storage.
When a plurality of thin battery modules are assembled and electrically connected in series to form an assembled battery, a structure in which the electrical connection can be made reliably and easily has a positive electrode and a negative electrode on the side surface of the thin battery module. Connection members are arranged, and connection harnesses and bus bars are attached to these connection members.
In general, when thin battery modules are assembled and bus bars are used for their electrical connection, the length in the assembly direction differs if the number of sets differs, so the thin battery modules are attached to the connection members of each thin battery module. A bus bar having a length suitable for the number of sets or the set length is used.
In addition, one or a few kinds of bus bars are prepared for connecting adjacent thin battery modules, and adjacent connecting members of adjacent thin battery modules are alternately arranged, and the adjacent positive and negative electrodes are connected to each other. In addition, there is also known a structure that achieves electrical continuity with these many bus bars.

JP 2006-066632 A JP 2007-265945 A JP 2009-231267 A JP 2009-301874 A Japanese Patent No. 3731595

As described above, since a large-capacity assembled battery is configured by assembling a plurality of thin battery modules, the electrical connection structure of the assembled battery greatly depends on the electrode arrangement structure of the thin battery module that is a constituent element thereof. ing. In addition, the electrode structure differs greatly depending on the arrangement of the lead terminals of the positive and negative electrodes of the laminated cell housed in the thin battery module itself.
In this respect, for example, as in the battery module disclosed in Japanese Patent Application Laid-Open No. 2007-265945 of Patent Document 2, the positive and negative lead terminals extending in the direction orthogonal to the cell stacking direction are provided, and the same A simple structure can be obtained by providing lead terminals with polarities protruding in the same direction and connecting the lead terminals with the same polarity to the positive and negative bus bars.
The present invention, in such a battery module, is a step further simplification of the module, its arrangement structure, and the electrical connection structure between the modules, which simplifies the configuration of the thin battery module and is adjacent to the battery module. The present invention proposes a thin battery module and an assembled battery using the same, which do not require the bus bar used to connect both electrode terminals between the thin battery modules.

When the invention described in the first claim of the present application is described with the reference numerals used in the embodiments, a plurality of

cells

2 and 2 are accommodated in the case 1, and the plurality of cells are overlapped and electrically connected. In the thin battery module,
Contact

portions

11 and 11 into which connection members 7 for electrical connection with adjacent thin battery modules are inserted are formed on the upper and lower surfaces of the case 1, and inside the case 1 adjacent to the contact portions 11. Is provided with a power contact portion 60 that is electrically connected to the

lead terminals

3 and 4 of the cell 2,
The power contact portion 60 is a thin battery module in which the connecting member 7 is detachably attached thereto.
According to the second aspect of the present invention, in the invention of the first aspect, the contact portions 11 on the upper and lower surfaces of the case 1 and the power contact portions 60 are provided at the same position in the cell assembly direction. This is a thin battery module.
The invention described in claim 3 of the present application is that each cell 2 includes positive and

negative lead terminals

3 and 4 extending in a direction orthogonal to the overlapping direction of the cells, and has the same polarity. The lead terminals of the same polarity are fixedly connected to the positive and

negative bus bars

6 and 6, and the bases of both the positive and

negative bus bars

6 and 6 are provided.

Reference numerals

62 and 62 denote thin battery modules which are arranged in an overlapped manner via insulating members, and in which power contact portions 60 are provided on both bus

bar base portions

62 and 62 arranged in the overlapped manner.
The invention described in claim 4 of the present application is that, in the invention of claim 1, the bus bar includes a connecting portion 61 with the

lead terminals

3 and 4, and the power contact portion 60, and at least the lead terminal and The thin battery module is characterized in that the connecting portion and the power contact portion 60 are exposed and the periphery is molded with an insulating resin.
The invention described in claim 5 of the present application is that, in claim 1, the

bus bars

6 and 6 for both the positive electrode and the negative electrode include the connecting portion 61 with the

lead terminals

3 and 4 and the power contact portion 60. It is a thin battery module characterized by having the same structure with the periphery molded with an insulating resin.
The invention described in claim 6 of the present application is the thin battery module according to claim 1, wherein a flat support plate 5 is provided, and one cell 2 is arranged above and below the support plate 5. It is.
The invention described in claim 7 of the present application is that, in claim 1, the portion of the power contact portion 60 is formed to be thicker than other portions of the bus bar 6, and the connecting member 7 is A central base 71 having a diameter larger than that of the power contact portion 60 and protrusions 72 provided on the power contact portion 60 and symmetrically provided on one side and the other side of the central base portion 71. , 72, and a thin battery module.
The invention described in claim 8 of the present application is that, in claim 1, the positive lead terminal 3 of each of the

cells

2 and 2 is made of a material that melts when a current exceeding a predetermined value flows. A thin battery module comprising a voltage measuring substrate 9 to which a wiring 91 fixed to each of the positive electrode lead terminals 3 and a wiring 92 fixed to the negative electrode side are connected. is there.
The invention described in claim 9 of the present application is the thin battery module according to claim 8, wherein a temperature sensor 93 for measuring a cell temperature is provided on the substrate 9 or the wiring.
According to the tenth aspect of the present invention, a plurality of thin battery modules according to any one of the first to ninth aspects are assembled, and a connecting member is mounted between adjacent thin battery modules. The assembled battery is characterized in that a plurality of assembled thin battery modules are connected in series.
The invention described in claim 11 of the present application includes a support part for supporting the plurality of assembled thin battery modules according to claim 10, wherein the support part has two output power supply parts on the positive electrode side and the negative electrode side. And the two output power supply units and the power contact portions on the positive electrode side and the negative electrode side of the assembled thin battery module are electrically connected to each other through the connection member. It is an assembled battery.

According to the first and tenth aspects of the present invention, in the thin battery module according to the present invention, the contact portion into which the connection member is inserted is formed on the upper and lower surfaces of the case. Electrical conduction can be achieved by simply inserting a connecting member between the battery modules.
Therefore, when the assembled battery is configured, the assembled battery can be electrically connected without using a number of connection harnesses and the like as in the prior art. In particular, as in the invention described in claim 11 of the present application, when a support part for supporting the assembled battery is provided, two output power supply parts on the positive electrode side and the negative electrode side, and a thin shape at both ends of the assembled battery For example, a connection member as described in claim 7 of the present application can be used for electrical connection between the positive electrode side and the negative electrode side power contact portion of the battery module. Can avoid interference between harnesses and connecting members and between harnesses, which can cause troubles around harnesses and busbars, and eliminates the need for wiring space and wiring work for connecting harnesses, etc. Therefore, simplification of the structure and easy manufacture can be achieved.
Further, in the thin battery module of the present invention, as in the invention described in claim 2 of the present application, the contact portions on the upper and lower surfaces of the case and the power contact portions are formed at the same position in the cell assembly direction. Therefore, it is possible to configure an assembled battery by attaching it to each contact portion using a connecting member. Therefore, positioning and positioning are facilitated when configuring the assembled battery, and the thin battery module. Therefore, it is possible to easily arrange the assembled battery and save work.
As in the invention described in claim 3 of the present application, in the thin battery module, lead terminals having the same polarity protrude in the same direction, and the base portions of the

bus bars

6 and 6 fixed to the lead terminals are overlapped. Since the power contact section is provided at the base of these bus bars, the layout of the lead terminals and bus bars, and also the power contact section is rationalized and simplified, and the manufacture is facilitated. can do.
As in the invention described in claim 4 of the present application, when the periphery of the bus bar is molded with an insulating resin, when the base portions of both the positive electrode and the negative electrode bus bar are arranged in a superposed manner, the insulating structure is naturally formed. Therefore, it is possible to improve the workability by eliminating the need for an additional insulating member, and it is possible to avoid a conduction failure that may occur when an additional insulating member is provided.
According to the invention described in claim 5 of the present application, since both the positive and negative electrode bus bars have the same structure, only one type of bus bar is required, and the number of parts can be saved. Further, since the periphery of the bus bar is molded with an insulating resin, workability can be improved and problems can be avoided as in the case of claim 4.
This type of cell generates heat due to charging / discharging, and the presence or absence of cooling or the cooling rate is a risk that it may lead to smoke or ignition due to deterioration in battery performance, internal short circuit, or thermal runaway caused by abnormalities such as overcharging. According to the invention described in claim 6 of the present application, the two cells are arranged in this way and are adjacent to the individual battery cell plane portions on the upper and lower surfaces of the case. In both sides, heat exchange with the outside air is efficiently and evenly performed through the case, thereby suppressing the temperature rise of the battery cell and the acceleration of the battery deterioration.
According to the seventh aspect of the present invention, since the connecting member is provided with the central base portion having a diameter larger than that of the power contact portion, the central base portion comes into contact with the bus bar to position the connecting member. Is made. At this time, the protruding portion on one side of the connecting member is attached to the power contact portion to achieve electrical conduction, and the protruding portion on the other side protrudes from the bus bar to form a connecting portion after the connection. Further, since the portion of the power contact portion is formed thicker than other portions of the bus bar, the contact area with the connection member attached to the power contact portion can be increased, The reliability of conduction can be ensured.
According to the invention described in claim 8 of the present application, the voltage of each cell can be individually measured on the substrate during normal operation. When a large current flows through the lead terminal due to some abnormal situation, the positive lead terminal is fused. Normally, an abnormality of the thin battery module in the case cannot be discriminated from the outside, but since the voltage at the substrate changes when the lead terminal is melted, the abnormality can be detected. Therefore, this can be dealt with as appropriate, such as replacing a thin battery module having an abnormality.
According to the ninth aspect of the present invention, since the temperature sensor for measuring the cell temperature is provided on the substrate or the wiring, it is possible to detect the temperature information of the cell, and the precise voltage and temperature of the cell. It can be monitored.

FIG. 1 is an overall configuration perspective view showing a thin battery module according to the present invention.
FIG. 2 is an enlarged perspective view of a main part of FIG. 1 with the upper and lower case members omitted.
FIG. 3 is a plan view showing the thin battery module of this example.
4 is a plan view showing a state where the upper case member is removed from the thin battery module of FIG.
FIG. 5 is a vertical cross-sectional view of the location of the bus bar in FIG.
FIG. 6 is an enlarged view of a portion X in FIG.
FIG. 7 is an overall configuration perspective view showing an assembled battery using the thin battery module according to the present invention.
FIG. 8 is a perspective view showing a state in which the assembled battery is stored in the storage holder.
FIG. 9 is a plan view showing a thin battery module according to another example.

Hereinafter, the present invention will be described based on illustrated embodiments.
1 to 6, the thin battery module 100 of this example includes a plurality of cells 2, 2 (2A, 2B) in upper and lower case members 1, 1 (upper case member 1A, lower case member 1B). ), And a plurality of these cells are stacked and connected in parallel. In this example, the

cells

2 and 2 are two cells, an upper cell 2A and a lower cell 2B.
Each

cell

2A, 2B has positive lead terminals 3, 3 (lead terminal 3A of upper cell 2A, lead terminal 3B of lower cell 2B) and negative electrode extending in a direction orthogonal to the overlapping direction. Lead terminals 4 and 4 (the lead terminal 4A of the upper cell 2A. The lead terminal 4B of the lower cell 2B), and the lead terminals having the same polarity protrude in the same direction. In this example, both the

positive lead terminals

3 and 3 and the

negative lead terminals

4 and 4 protrude in the same direction.
Furthermore, in this example, a flat support plate 5 is provided at the center, and the

cells

2A and 2B are arranged with the support plate 5 interposed therebetween. This type of laminate cell generates heat by charging and discharging, and the presence or absence of cooling and the cooling rate have a significant effect on battery performance. Thus, since two cells are arranged up and down, both sides can perform heat exchange with the outside air via the

case members

1A and 1B. Thereby, the acceleration of the battery deterioration which may be caused by the heat generation of the cell is suppressed.
In the figure, reference numeral 6 denotes a bus bar, to which the lead terminal of the cell 2 is connected. In this example, a positive bus bar 6A is disposed on the upper side and a negative bus bar 6B is disposed on the lower side with the support plate 5 interposed therebetween. The

positive lead terminals

3 and 3 protruding in the same direction are connected to the positive bus bar 6A, and the

negative lead terminals

4 and 4 are connected to the negative bus bar 6B. These

lead terminals

3 and 4 and bus bar 6 are connected and fixed by laser welding.
The bus bar 6 is formed by press-molding a copper plate and includes a distal end portion 61 formed in a crank shape and a base portion 62 on which a power contact portion 60 described later is formed. Further, a resin insulating member 63 is molded (covered) around the base side of the bus bar 6 except for the location of the power contact portion 60.
In the bus bar 6 described above, the

bases

62 and 62 of both the positive and

negative bus bars

6A and 6B are arranged in an overlapping manner. In this example, the positive and

negative bus bars

6A and 6B are fixed by tapping screws with the support plate 5 interposed therebetween.
Even if the

bases

62 and 62 of both the positive and

negative bus bars

6A and 6B are arranged in an overlapping manner as in this example, the periphery of the bus bar 6 is molded with an insulating resin, so that it is naturally insulated. A structure can be achieved. In this way, when the periphery of the bus bar is molded with an insulating resin, the workability is improved by eliminating the need for an insulating member, and when an insulating member is provided separately, the insulating member may be changed depending on the arrangement or vibration. Although there is a possibility of causing a conduction failure such as a short circuit due to movement, such a situation can be avoided if the insulating member is fixed by molding.
When the bus bars 6A and 6B are arranged in an overlapping manner, the

power contact portions

60 and 60 provided on the bus

bar base portions

62 and 62 are viewed in the overlapping direction of the

cells

2A and 2B. The centers of these contact portions are formed at the same position.
Further, a connecting member 7 described later is detachably attached to one or both of the

power contact portions

60, 60, so that adjacent thin battery modules are electrically connected in series.
Therefore, when the thin battery module 100 of the present example is used, when the assembled battery is formed, the connection member 7 is used to mount the battery pack on the

power contact portions

60 and 60, so that a large number of conventional connections can be obtained. It is possible to achieve electrical conduction of the assembled battery without using a wiring harness or bus bar.
Thus, being able to achieve the electrical continuity of the assembled battery without using a large number of harnesses for connection, etc. avoids interference between the harness, the connection member, and the harness that may occur when the harness for connection is used. It is possible to avoid failures around the harness and busbar, and further eliminate the wiring space and wiring work for connecting harnesses, etc., simplifying the thin battery module structure and facilitating production Can be achieved.
Further, in this example, the power contact portions 60 of both the bus bars 6A and 6B are formed at the same position in the cell overlapping direction, so that the

power contact portions

60 and 60 are connected using the connecting member 7. When the battery pack is mounted, the positioning and alignment are facilitated, and the thin battery modules are naturally aligned. Accordingly, the battery pack configuration can be simplified and the work can be saved.
The portion of the power contact portion 60 is formed thicker than other portions of the bus bar 6. Since the connecting member 7 is detachably attached to the power contact portion 60, the power contact portion 60 is formed thicker than the other portions of the bus bar 6. And electrical connection between the connecting member 7 and the connecting member 7 can be improved.
The connecting member 7 includes a central base portion 71 having a diameter larger than that of the power contact portion 60 in the central portion and projecting portions 72 provided symmetrically on one side and the other side of the central base portion 71. The protrusion 72 is a part to be attached to the power contact part 60. In this example, of the two

protrusions

72A and 72B, the lower protrusion 72B is attached to the positive bus bar 6A. . The upper protruding portion 72A protrudes from the bus bar 6A and constitutes a connecting portion after the heel.
That is, the upper projecting portion 72A allows the power of the negative bus bar 6B located on the lower side of the upper thin battery module when another thin battery module is superimposed on the thin battery module from above. The electrical contact in the series connection between the upper and lower thin battery modules which are fitted to the contact part 60 for use and thereby overlapped is thereby achieved.
In the thin battery module 100 of this example configured as described above, the connecting member 7 is provided with a central base 71 having a diameter larger than that of the power contact portion, so that the central base 71 contacts the bus bar 6. In contact therewith, the connecting member 7 is positioned. In addition, since the power contact portion 60 is formed thicker than other portions of the bus bar 6, as described above, the contact area with the connection member 7 attached to the power contact portion 60 is increased. It is possible to ensure the reliability of electrical continuity.
In the figure, reference numeral 8 denotes a lead holder, which is a lead holder 8A that presses the lead terminal 3A of the lead positive electrode from the top to the bottom, and a lead holder that is separate from the lead holder 8A and presses the lead terminal 4A of the lead negative electrode from the top. 8A and a lead holder 8B that presses the

lead terminals

3B and 4B of the lead positive electrode and the negative electrode from below to above.
A buffer material 81 is provided on the pressing surface of the lead holder 8. Each lead holder 8 is fixed by a tapping screw with the support plate 5 interposed therebetween.
Each

cell

2A, 2B and both

bus bars

6A, 6B described above are housed in a case made up of upper and

lower case members

1A, 1B, and further, upper and

lower case members

1A, 1B corresponding to the

power contact portions

60, 60. A contact portion 11 (11A, 11B) for inserting the connecting member 7 is formed.
Further, in the thin battery module 100 of the present example, the

positive lead terminals

3A and 3B of the

cells

2A and 2B are made of a material that melts when a current exceeding a predetermined value flows. In this example, the

positive lead terminals

3A and 3B are made of aluminum, and are melted when a current exceeding 250 amperes flows.
In addition, a voltage measuring substrate 9 is provided in the vicinity of the support plate 5 on the opposite side to the bus bar 6. A microcomputer (not shown) is mounted on the substrate 9, and

wirings

91A and 91B fixed to the

positive lead terminals

3A and 3B of the

cells

2A and 2B, respectively, and a wiring 92 fixed to the negative electrode side. These wirings constitute a voltage measurement FPC (flexible printed circuit) which is a thin harness. The voltage measurement substrate 9 is provided in the vicinity of the support plate 5 that does not overlap the

cells

2A and 2B. Thereby, the influence of the magnetic field produced by the electric current at the time of battery discharge can be avoided.
If comprised in this way, the voltage of each

cell

2A, 2B in the board | substrate 9 can be measured separately at the normal time (normal time). When a large current flows through the lead terminal due to some abnormal situation, one and / or the other of the

positive lead terminals

3A and 3B is melted. Normally, an abnormality of the thin battery module in the case cannot be discriminated from the outside, but when the positive lead terminal 3 is melted, the voltage on the substrate 9 changes, so that the abnormality can be detected. By detecting an abnormality in this way, it is possible to cope with this by replacing a thin battery module having an abnormality, for example.
The substrate 9 is provided with

temperature sensors

93A and 93B (in this example, thermistors) that individually measure the temperatures of the

cells

2A and 2B. Thereby, the temperature information of each

cell

2A, 2B can be obtained. Note that the temperature sensor may be embedded in the wiring.
In addition, on the upper and lower surfaces of the substrate 9, connecting

portions

94A and 94B for connecting the

substrates

9 and 9 of the thin battery modules adjacent in the vertical direction in series are provided. For example, one of the connecting

portions

94A and 94B is a spring connector that contacts a metal dividing surface for connection on the substrate 9, and the other contacts the metal dividing surface. The substrate 9 is held by upper and

lower substrate holders

95A and 95B. The

substrate holders

95A and 95B are fixed by tapping screws with the support plate 5 interposed therebetween.
In the thin battery module of the present invention configured as described above, the assembled battery is configured by assembling a plurality of thin battery modules, and only mounting the connection member 7 between adjacent thin battery modules, Thereby, electrical conduction is also achieved. Conventionally, in this type of assembled battery, a large number of connection harnesses and bus bars have been used to achieve electrical continuity of the assembled battery. However, in the present invention, as shown in the specific examples described later, No harness etc. are required. Therefore, according to the assembled battery according to the present invention, it is possible to avoid interference between the harness, the connecting member, and the harness that may occur when the connection harness or the like is used, and to avoid a failure around the harness / bus bar. In addition, wiring space such as a harness for connection and wiring work are not required, so that the structure can be simplified and the manufacturing can be facilitated.
As an example of configuring an assembled battery by assembling a plurality of thin battery modules of this example, one connecting member 7 is attached to one of the power contact portions 60 of one polarity, for example, the positive power contact portion 60. A plurality of thin battery modules are prepared, and one (for example, the lower) thin battery module is connected to the other (for example, the upper) thin battery module of the connection member 7 attached to the one thin battery module. The upper projecting portion 72A is fitted to the lower power contact portion 60 of the other thin battery module to form the assembled battery 200 in which a plurality of thin battery modules are combined (FIG. 7). reference). The assembled battery 200 is configured by connecting the plurality of thin battery modules in series.
However, in the present invention, when a plurality of thin battery modules are assembled to form an assembled battery, the mounting mode of the connection member 7 to the thin battery module is not limited to the above, In order to distinguish between the positive electrode side and the negative electrode side, for example, the shape and size of the power contact portion are made different. Accordingly, the shape and size of the projecting

portions

72A and 72B on the upper and lower sides of the connection member 7 are changed accordingly. Or the connecting member 7 is formed of a round or square straight member, and a power contact portion having a shape and structure conforming to the straight member is provided. Furthermore, the electrical contact between the power contact portion and the connecting member is provided. Appropriate aspects such as fitting, locking, and engaging can be adopted for the connection structure.
When an assembled battery is configured, as shown in FIG. 8 as an example, a support portion 201 for the assembled battery 200 that houses the plurality of thin battery modules is provided. In this example, the support portion 201 includes a bottom plate portion 202 and a top plate portion 203 and is held by surrounding

rods

204 and 204. Two

power supply units

205 and 206 for output on the positive electrode side and the negative electrode side are provided at portions on the thin battery module side of the bottom plate unit 202 and the top plate unit 203, respectively. Reference numeral 207 denotes an output wiring for voltage measurement.
In this example, a power contact portion 60 for mounting the connection member 7 is provided on the two output

power supply portions

205 and 206 on the positive electrode side and the negative electrode side. The two output

power supply units

205 and 206 and the power contact portions 60 on the positive electrode side and the negative electrode side of the assembled

thin battery modules

100 and 100 are electrically connected to each other through the connection member 7. It is carried out.
In this way, the plurality of

thin battery modules

100, 100 housed in the support portion 201 constitute an assembled battery 200. The assembled battery 200 constitutes one large-capacity battery formed by connecting the plurality of

thin battery modules

100 and 100 in series.
Accordingly, when the assembled battery 200 is configured, each power contact between the adjacent

thin battery modules

100 and 100 and between the thin battery module 100 and the two output

power supply units

205 and 206 on the positive electrode side and the negative electrode side is provided. Since it is possible to achieve electrical continuity simply by inserting the connection member 7 into the

portions

60, 60, it is possible to achieve electrical continuity of the assembled battery without using a number of conventional connection harnesses or the like. . Therefore, it is possible to avoid the interference between the harness, the connecting member, and the harness that may occur when the connecting harness or bus bar is used, and the failure around the harness / bus bar can be avoided. Since wiring space such as a harness and wiring work are not required, the structure can be simplified and the manufacturing can be facilitated.
Further, in the support part 201 of the assembled battery 200 of the present example, the substrate is disposed on the thin battery module side portions of the bottom plate part 202 and the top plate part 203 (on the upper side of the bottom plate part 202 and below the top plate part 203). Nine connecting

portions

94A and 94B are provided with connecting portions (not shown) for electrical connection. By providing these connection parts, voltage and temperature information of each

cell

2A, 2B measured individually in each

thin battery module

100, 100 can be obtained.
In the thin battery module 100 of the present example described above, the

positive lead terminals

3 and 3 and the

negative lead terminals

4 and 4 both project in the same direction, and the upper and

lower cells

2A and 2B are electrically connected. However, the present invention is not limited to this. For example, the

positive lead terminals

3 and 3 and the

negative lead terminals

4 and 4 may protrude in opposite directions.
In this case, as shown in FIG. 9, a positive electrode contact portion similar to the previous example is provided on one surface (surface) of the thin battery module 110 and the connecting member 7 is attached thereto, and the negative electrode is disposed on the opposite side in the width direction. The contact member is provided and the connecting member 7 is attached thereto. Note that the same contact portion as described above is provided on the other surface (back surface) of the thin battery module 110 at the same position as these contact portions.
The thin battery module described above and the assembled battery in which these are assembled are not limited to the specific examples described above. In particular, in a thin battery module, not only electrical parallel connection of cells but also serial connection can be performed, and the shape, structure, arrangement, etc. of the bus bar, power contact portion in the thin battery module, and As long as the shape, structure, etc. of the assembled battery are suitable for the purpose of the present invention which contributes to facilitation or simplification of the assembly of adjacent thin battery modules, an appropriate mode can be adopted.

The present invention is suitable for a thin battery module for driving a vehicle driving motor of an electric vehicle or a hybrid electric vehicle, and an assembled battery configured by assembling the thin battery modules.

DESCRIPTION OF SYMBOLS 1 Case member 1A Upper case member 1B Lower case member 11 Contact part 11A Upper case member contact part 11B Lower case member contact part 2 Cell

2A Upper cell

2B Lower cell 3 Positive lead terminal 3A Upper Positive lead terminal 3B of the lower cell 2B Positive lead terminal 4B of the lower cell 2B Negative lead terminal 4A Negative lead terminal 4B of the upper cell 2A Negative lead terminal 5 of the lower cell 2B Support plate 6 Bus bar 6A Bus bar 6B Negative electrode bus bar 60 Power contact part 61 Bus bar tip 62 Bus bar base 63 Insulating member 7 Connection member 71 Central base 72 Projecting part 72A Upper projecting part 72B Lower projecting part 72B
8 Lead holder 8A Upper lead holder 8B Lower lead holder 81 Buffer material 9 Substrate 91A Positive electrode wiring 91B Positive electrode wiring 92 Negative electrode wiring

93A Temperature sensor

93B Temperature sensor

94A Connecting portion 94B Connecting portion 95A Upper substrate holder 95B Lower side Substrate holder 100 Thin battery module 110 Thin battery module 200 Battery pack 201 Support part 202 Bottom plate part 203 Top plate part 204 Rod 205 Output power supply part 206 Output power supply part 207 Output wiring

Claims

In a thin battery module in which a plurality of cells are housed in a case and the plurality of cells are overlapped and electrically connected,
Formed on the upper and lower surfaces of the case are contact portions into which connecting members for electrical connection with adjacent thin battery modules are inserted, and the cell lead terminals are formed in the case adjacent to the contact portions. Is provided with a power contact portion conducting to
The thin battery module according to claim 1, wherein the power contact portion is attached to the connection member in a detachable manner.
2. The thin battery module according to claim 1, wherein the contact portions on the upper and lower surfaces of the case and the power contact portions are provided at the same position in the cell assembly direction.
Each cell includes positive and negative lead terminals extending in a direction orthogonal to the cell stacking direction, and the lead terminals having the same polarity project in the same direction,
The lead terminals of the same polarity are fixedly connected to the bus bars for the positive electrode and the negative electrode,
The bases of both the positive electrode bus bar and the negative electrode bus bar are arranged in an overlapping manner via an insulating member,
2. The thin battery module according to claim 1, wherein a power contact portion is provided on both bus bar base portions arranged in an overlapping manner.
The bus bar includes a connection portion with the lead terminal and the power contact portion, and at least the connection portion with the lead terminal and the power contact portion are exposed and the periphery is molded with an insulating resin. The thin battery module according to claim 1.
The bus bar for both the positive electrode and the negative electrode has the same structure in which the connection portion with the lead terminal and the contact portion for power are provided and the periphery is molded with an insulating resin. The thin battery module described.
2. The thin battery module according to claim 1, wherein a flat support plate is provided, and one cell is arranged above and below the support plate.
The portion of the power contact portion is formed to be thicker than other portions of the bus bar, and the connecting member has a central base portion having a diameter larger than that of the power contact portion at the center portion and the power contact portion. The thin battery module according to claim 1, further comprising a projecting portion that is a portion to be attached to the contact portion and provided symmetrically on one side and the other side of the central base portion.
The lead terminal of the positive electrode of each cell is made of a material that melts when a current exceeding a predetermined value flows,
2. The thin film according to claim 1, further comprising a voltage measurement substrate to which a wiring fixed to each positive electrode lead terminal of each cell and a wiring fixed to the negative electrode side are connected. Battery module.
The thin battery module according to claim 8, wherein a temperature sensor for measuring a cell temperature is provided on the substrate or the wiring.
A plurality of the thin battery modules according to any one of claims 1 to 9 are assembled, and a connecting member is mounted between the adjacent thin battery modules to form an assembled battery. A battery pack comprising thin battery modules connected in series.
Provided with a support part for supporting the plurality of assembled thin battery modules, the support part is provided with two power supply parts for output on the positive electrode side and the negative electrode side, the two output power supply parts, and the assembled thin type The assembled battery according to claim 10, wherein the battery module is electrically connected to each of the power contact portions on the positive electrode side and the negative electrode side through the connection member.