WO2015186333A1

WO2015186333A1 - Battery unit

Info

Publication number: WO2015186333A1
Application number: PCT/JP2015/002746
Authority: WO
Inventors: 篤昌澤田
Original assignee: 日本電気株式会社
Priority date: 2014-06-02
Filing date: 2015-06-01
Publication date: 2015-12-10
Also published as: JPWO2015186333A1

Abstract

[Problem] To suppress a rise in the temperature of a terminal while efficiently dissipating the heat generated from the terminal through a simple configuration. [Solution] The battery unit comprises: a battery cell for charging or discharging electricity; a battery cell case for housing the battery cell; a terminal disposed on the battery cell; a heat accumulation part formed from an insulating member and mounted so as to be in contact with the terminal, said heat accumulation part receiving and accumulating the heat from the terminal; and a heat conduction part which connects the heat accumulation part to the battery cell case and conducts the heat accumulated by the heat accumulation part to the battery cell case.

Description

Battery unit

The present invention relates to a battery unit, for example, a battery unit having a battery cell for charging or discharging electricity.

In recent years, secondary batteries that can charge or discharge electricity are widely used in portable electronic devices such as notebook computers, mobile phones, portable information terminals, tablet terminals, digital cameras, and portable music players. Further, the secondary battery is used not only for these portable electronic devices but also as a power source for transportation such as railways, automobiles and airplanes. Furthermore, secondary batteries are being used as power storage devices for power leveling and smart grids.

As described above, since the secondary battery is used in a wide range of applications, various performances are required. In particular, in order to generate a large amount of power even though it is small, a resistance load may increase at the terminal portion of the battery terminal (electrode) when a discharge with a large current is required. At this time, heat may be generated at the terminal portion of the battery terminal. For this reason, the safety | security concern increases, for example, the performance of a secondary battery deteriorates, a secondary battery ignites, or a skin develops a burn when skin contacts.

With respect to this problem, the technique described in Patent Document 1 is generated when a large current flows to the terminal of the secondary battery by attaching the heat radiating portion (heat radiating fin) to the terminal (electrode terminal) of the secondary battery. The fever is suppressed.

Further, with respect to the above problem, the technique described in Patent Document 2 employs a structure in which a refrigerant is circulated in addition to the heat dissipating fins.

In addition, as a related technique of the present invention, for example, techniques described in Patent Document 3 and Patent Document 4 are disclosed.

JP 2009-245730 A Japanese Patent No. 4349037 JP 2012-138315 A JP 2013-222603 A

However, the techniques described in Patent Documents 1 and 2 have a problem that the battery unit cannot be reduced in size because the structure for suppressing the temperature rise of the terminals of the secondary battery becomes large.

In the techniques described in Patent Documents 1 and 2, a large current flows through the contact portion between the terminals of the secondary battery when the battery cell is charged or discharged. For this reason, the structure (a structure which circulates a radiation fin and a refrigerant | coolant) attached to the terminal generate | occur | produces heat by the influence of the contact resistance between terminals of a secondary battery. Further, other surrounding structures are also heated up almost simultaneously due to heat transfer from the structures attached to the terminals.

The effects of this phenomenon include deterioration of the internal members and exterior members of the battery cell, deterioration of charge performance or discharge performance, and occurrence of electrolyte exposure.

Further, in the techniques described in Patent Documents 1 and 2, a heat radiation fin and a refrigerant circulation mechanism that operate regardless of heat generation time are provided regardless of whether the charging or discharging is performed for a short period of time or intermittent charging / discharging. For this reason, it is necessary to provide a large structure around the terminals of the secondary battery. Therefore, it is difficult to apply the techniques described in Patent Documents 1 and 2 to devices that have a limited mounting capacity of the battery system.

The present invention has been made in view of such circumstances, and an object of the present invention is a battery unit that can efficiently dissipate heat generated by a terminal with a simple configuration while suppressing temperature rise of the terminal. Is to provide.

The battery unit of the present invention is formed by a battery cell that charges or discharges electricity, a battery cell case that houses the battery cell, a terminal provided in the battery cell, and an insulating member, and contacts the terminal. The heat storage part which receives the heat of the said terminal and stores it, and connects between the said heat storage part and the said battery cell case, and heat which conducts the heat stored by the said heat storage part to the said battery cell case And a conductive portion.

According to the battery unit of the present invention, it is possible to efficiently dissipate the heat generated by the terminal while suppressing the temperature rise of the terminal with a simple configuration.

It is a perspective view which shows the structure in a battery cell case among the structures of the battery unit in the 1st Embodiment of this invention. It is a terminal side top view which shows the structure of the battery unit in the 1st Embodiment of this invention. It is a figure which shows the relationship between the temperature of the terminal of the battery unit in 1st Embodiment of this invention, and elapsed time, Comprising: It is a figure which shows the example which performed charge or discharge in time longer than temperature rising suppression time. . It is a figure which shows the relationship between the temperature of the terminal of the battery unit in 1st Embodiment of this invention, and elapsed time, Comprising: It is a figure which shows the example which performed charge or discharge in time shorter than temperature rising suppression time. . It is a perspective view which permeate | transmits and shows the structure in the battery unit in the 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the battery unit in the 2nd Embodiment of this invention.

<First Embodiment>
The configuration of the battery unit 100 in the first embodiment of the present invention will be described.

FIG. 1 is a perspective view showing the structure inside the battery cell case 60 in the configuration of the battery unit 100. FIG. 2 is a terminal side plan view showing the configuration of the battery unit 100.

First, an outline of the configuration of the battery unit 100 will be described.

1 and 2, the battery unit 100 has three battery cells 10. As shown in FIG. 2, a battery cell case 60 is provided so as to cover the outer periphery of the battery cell 10. Moreover, it attaches to the one end part of each battery cell 10 so that the positive electrode tab lead terminal 20a and the negative electrode tab lead terminal 20b may protrude. When the positive electrode or the negative electrode is not distinguished, the positive electrode tab lead terminal 20a and the negative electrode tab lead terminal 20b are collectively referred to as a tab lead terminal 20. The external connection terminal 30 is connected to one positive tab lead terminal 20a. Similarly, the external connection terminal 30 is connected to one negative tab lead terminal 20b.

Also, between the tab lead terminals 20, a temperature rise suppression structure 40 and an inter-terminal conductor 50 are provided. Further, a temperature rise suppression structure 40 is provided between the tab lead terminal 20 and the inner surface of the battery cell case 60.

As above, the outline of the configuration of the battery unit 100 has been described.

Next, the details of the configuration of the battery unit 100 will be described.

As shown in FIG. 1 and FIG. 2, the battery unit 100 includes a battery cell 10, a positive electrode tab lead terminal 20 a, a negative electrode tab lead terminal 20 b, an external connection terminal 30, a temperature rise suppression structure 40, and an inter-terminal conductivity. A body 50 and a battery cell case 60 are provided.

As shown in FIG. 1, the battery cell 10 is accommodated in a battery cell case 60. The battery cell 10 charges or discharges electricity. Here, as an example, the battery cell 10 is a laminate-type battery cell. 1 and 2 show three battery cells 10 superimposed on each other. Note that the number of battery cells 10 may be three or less or three or more.

As shown in FIGS. 1 and 2, the positive electrode tab lead terminal 20 a is connected to one end of each battery cell 10.

1 and 2, the negative electrode tab lead terminal 20b is connected to one end of each battery cell 10.

1 and 2, the external connection terminal 30 is connected to one of the positive electrode tab lead terminals 20a provided in each of the three battery cells 10. Further, the external connection terminal 30 is connected to one of the negative electrode tab lead terminals 20 b provided in each of the three battery cells 10. That is, two external connection terminals 30 are provided, one is connected to one of the positive electrode tab lead terminals 20a, and the other is connected to the negative electrode tab lead terminal 20b.

1 and 2, one of the two external connection terminals 30 is connected to the positive electrode tab lead 20a of the lowermost (bottom) battery cell 10 among the three battery cells 10. The other of the two external connection terminals 30 is connected to the negative electrode tab lead 10 b of the uppermost (top) battery cell 10 among the three battery cells 10. In FIG. 2, the upper left external connection terminal 30 is provided between a heat storage unit 41 described later and the negative electrode tab lead 20 b of the uppermost battery cell 10. In FIG. 2, the lower right external connection terminal 30 is provided between the positive electrode tab lead 20 a of the lowermost battery cell 10 and a heat storage unit 41 described later.

The external connection terminal 30 is exposed outside the battery cell case 60. An external charging device (not shown) is connected to the external connection terminal 30. The external charging device charges each battery cell 10 by supplying power to each battery cell 10 in the battery unit 100 via the external connection terminal 30 and the tab lead terminal 20.

As shown in FIGS. 1 and 2, the temperature rise suppression structure 40 is provided between the tab lead terminals 20 extended from the plurality of stacked battery cells 10. Further, a temperature rise suppression structure 40 is also provided between the tab lead terminal 20 extended from the uppermost or lowermost battery cell 10 in FIG. 2 and the inner surface of the battery cell case 60. When the external connection terminal 30 is connected to the tab lead terminal 20, the temperature rise suppression structure 40 is provided between the external connection terminal 30 connected to the tab lead terminal 20 and the inner surface of the battery cell case 60. ing.

As shown in FIGS. 1 and 2, the temperature rise suppression structure 40 includes a heat storage unit 41 and a heat conduction unit 42. The temperature increase suppression structure 40 is formed by integrating the heat storage unit 41 and the heat conduction unit 42.

The heat storage part 41 is formed of an insulating member (for example, a resin member). As shown in FIGS. 1 and 2, the heat storage unit 41 is attached so as to contact the tab lead terminal 20 or the external connection terminal 30.

In FIG. 2, the first heat storage unit 41 from the upper left is provided between the heat conduction unit 42 connected to the battery cell case 60 and the external connection terminal 30. In FIG. 2, the second heat storage unit 41 from the upper left side is provided between the heat conducting unit 42 connected to the battery cell case 60 and the negative electrode tab lead 20 b of the uppermost battery cell 10. In FIG. 2, the third heat storage part 41 from the upper left side is provided between the heat conducting part 42 connected to the battery cell case 60 and the positive electrode tab lead terminal 20a of the second battery cell 10 from the upper side. Yes. In FIG. 2, the fourth (bottom) heat storage unit 41 from the upper left is a negative electrode tab lead 10 b of the third (bottom) battery cell 10 from the top, and a heat conduction unit connected to the battery cell case 60. 42 is provided.

In FIG. 2, the first heat storage unit 41 from the upper right is provided between the heat conducting unit 42 connected to the battery cell case 60 and the external connection terminal 30. In FIG. 2, the second heat storage unit 41 from the upper right side is provided between the negative electrode tab lead 20 b of the second battery cell 10 from the upper side and the heat conducting unit 42 connected to the battery cell case 60. . In FIG. 2, the third heat storage unit 41 from the upper right side is connected to the heat conducting unit 42 connected to the battery cell case 60, the positive electrode tab lead 20 a of the third battery cell 10 from the upper side, and the battery cell case 60. It is provided between the heat conducting part 42 and the heat conducting part 42. In FIG. 2, the fourth (lowermost) heat storage unit 41 from the upper right side is provided between the external connection terminal 30 and the heat conducting unit 42 connected to the battery cell case 60.

The heat storage unit 41 receives heat from the tab lead terminal 20 and stores the heat. Further, the heat storage unit 41 receives the heat of the tab lead terminal 20 via the external connection terminal 30 and stores the received heat. The heat storage unit 41 is also referred to as a heat storage insulating resin.

As shown in FIG. 2, the heat conducting unit 42 connects between the heat storage unit 41 and the battery cell case 60. The heat conduction unit 42 conducts the heat stored by the heat storage unit 41 to the battery cell case 60.

1 and 2, the inter-terminal conductor 50 is provided between the tab lead terminals 20 and electrically connects the tab lead terminals 20. Thereby, the tab lead terminals 20 are electrically connected by the inter-terminal conductor 50. In the example of FIG. 2, the inter-terminal conductor 50 is provided at two locations. That is, in FIG. 2, the inter-terminal conductor 50 on the left side is provided between the positive electrode tab lead 20a of the second battery cell 10 from the top and the negative electrode tab lead 20b of the lowermost battery cell 10, and these are electrically connected. Connected. In FIG. 2, the inter-terminal conductor 50 on the right side is provided between the positive electrode tab lead 20a of the uppermost battery cell 10 and the negative electrode tab lead 20b of the second battery cell 10 from the top. Connected. As shown in FIG. 2, the battery cell case 60 accommodates the battery cell 10. The battery cell case 60 is formed using a heat conductive member.

The detailed configuration of the battery unit 100 has been described above.

Next, a method for manufacturing the battery unit 100 will be described.

First, the battery cells 10 with the tab lead terminals 20 extending from one end are overlapped.

Next, the external connection terminal 30 is connected to at least one positive tab lead terminal 20a. Similarly, the external connection terminal 30 is connected to at least one negative tab lead terminal 20b. The external connection terminal 30 is formed of a conductive member such as copper or a copper alloy, for example.

Next, the temperature increase suppressing structure 40 is created by superimposing the heat storage unit 41 and the heat conduction unit 42 so as to be integrated.

The heat storage unit 41 is made by kneading and preparing a heat storage material corresponding to a temperature at which temperature rise is desired to be suppressed in a highly insulating liquid resin, and then curing the heat storage material. In addition, liquid resin with high insulation is an epoxy resin, a silicone resin, a phenol resin, a polyimide resin etc., for example. Examples of the heat storage material corresponding to the temperature to suppress temperature rise include paraffin-containing capsule powder, water-containing capsule powder, sodium acetate / trihydrate-containing capsule powder, lithium nitrate / trihydrate-containing capsule powder, stearin Acid-containing capsule powder, cetyl alcohol-containing capsule powder, and the like. The heat conducting part 42 is made of a heat radiating sheet having high heat conductivity (for example, copper foil, aluminum foil, gold foil, silver foil, graphite sheet, carbon fiber-containing elastomer, boron nitride-containing elastomer).

As shown in FIGS. 1 and 2, between the tab lead terminals 20 (or external connection terminals 30), between the tab lead terminals 20 (or external connection terminals 30) and the inner surface of the battery cell case 60, The temperature increase suppression structure 40 is disposed. At this time, the temperature rise suppression structure 40 is arranged so that the heat conduction part 42 thermally connects the heat storage part 41 and the battery cell case 60. Thereby, the heat stored by the heat storage unit 41 is conducted to the battery cell case 60. In addition, the inter-terminal conductor 50 is disposed between the tab lead terminals 20. Thereby, the tab lead terminals 20 are electrically connected via the inter-terminal conductor 50.

Finally, the battery cell case 60 is used to enclose the battery cell 10. At this time, each member is arranged so that one end of the external connection terminal 30 is exposed to the outside of the battery cell 10.

The method for manufacturing the battery unit 100 has been described above.

Next, usage examples of the battery unit 100 will be described.

FIG. 3 is a diagram showing the relationship between the temperature of the terminal of the battery unit 100 and the elapsed time, and is a diagram showing an example in which charging or discharging is performed in a time longer than the temperature rise suppression time TS. FIG. 4 is a diagram illustrating the relationship between the temperature of the external connection terminal 30 of the battery unit 100 and the elapsed time, and is a diagram illustrating an example in which charging or discharging is performed in a time shorter than the temperature rise suppression time TS.

First, an example in which charging or discharging is performed for a time longer than the temperature rise suppression time TS will be described with reference to FIG.

Here, the temperature rise suppression time TS refers to a time during which the heat storage unit 41 can be suppressed below the heat storage temperature α, which is a temperature at which the heat of the tab lead terminal 20 can be stored.

In general, when a secondary battery without a temperature rise suppression structure is charged or discharged, a change in terminal temperature of a battery without a temperature rise suppression structure is represented by a temperature change curve L20 in FIG. Is done. As shown in FIG. 3, the temperature change curve L20 rises as the elapsed time increases until the surface temperature of the terminal is saturated, unless charging or discharging stops.

On the other hand, in the battery unit 100 including the temperature rise suppression structure 40 of the present embodiment, the change in the terminal temperature of the battery unit 100 having the temperature rise suppression structure 40 is represented by the temperature change curve L21 in FIG.

As shown in FIG. 3, as the elapsed time elapses, when the energization stop period 16a to the tab lead terminal 20 is shifted to the charging or discharging period 17a, the heat storage unit 41 included in the temperature rise suppression structure 40 is moved to the tab lead. The heat of the terminal 20 is stored. Thereby, the temperature of the tab lead terminal 20 reaches the heat storage temperature α. The heat storage temperature α is a temperature at which the heat storage unit 41 can store the heat of the tab lead terminal 20 as described above.

Thereafter, a temperature increase suppression time TS in which the temperature of the tab lead terminal 20 is temporarily maintained constant is generated according to the amount of latent heat of the heat storage material included in the heat storage unit 41. After that, when the heat storage amount corresponding to the heat generation amount from the tab lead terminal 20 is exceeded, the temperature is raised again.

In addition, since the temperature increase suppression structure 40 includes the heat conduction portion 42, the heat dissipation suppression structure 40 dissipates heat even during heat storage during the temperature increase suppression time TS.

Next, an example in which charging or discharging is performed in a time shorter than the temperature rise suppression time TS will be described with reference to FIG.

In general, when a secondary battery without a temperature rise suppression structure is charged or discharged, a change in terminal temperature of a battery without a temperature rise suppression structure is represented by a temperature change curve L20 in FIG. Is done. As shown in FIG. 4, in the temperature change curve L20 of the terminal of the secondary battery that does not have the temperature rise suppression structure, the terminal temperature rises when the transition from the energization stop period 16a to the charge or discharge period 17b occurs. And if it enters into the electricity supply stop period 16a again, the heat of a terminal will be dissipated and temperature will fall.

On the other hand, in the battery unit 100 including the temperature rise suppression structure 40 of the present invention, the change in the terminal temperature of the battery unit 100 having the temperature rise suppression structure 40 is represented by a temperature change curve L21 in FIG.

As shown in FIG. 4, as the elapsed time elapses, when the energization stop period 16a to the tab lead terminal 20 is shifted to the charging or discharging period 17a, the heat storage unit 41 included in the temperature increase suppression structure 40 is moved to the tab lead. The heat of the terminal 20 is stored. Thereby, the temperature of the tab lead terminal 20 reaches the heat storage temperature α.

Thereafter, a temperature increase suppression time TS in which the temperature of the tab lead terminal 20 is temporarily maintained constant is generated according to the amount of latent heat of the heat storage material included in the heat storage unit 41. During this time, the temperature of the tab lead terminal 20 is maintained at the heat storage temperature α by the heat storage of the heat storage unit 41.

When the charging or discharging is finished in a time shorter than the temperature rise suppression time TS (end of the charging or discharging time 17b), the temperature of the tab lead terminal 20 drops in the next energization stop period 16b before the thermal saturation. Go.

As described above, the battery unit 100 according to the first embodiment of the present invention includes the battery cell 10, the battery cell case 60, the tab lead terminal 20 (terminal), the heat storage unit 41, and the heat conduction unit 42. ing.

Battery cell 10 charges or discharges electricity. The battery cell case 60 accommodates the battery cell 10. The tab lead terminal 20 (terminal) is provided in the battery cell 10. The heat storage unit 41 is formed of an insulating member, is attached so as to be in contact with the tab lead terminal 20, receives heat from the tab lead terminal 20, and stores the heat. The heat conducting unit 42 connects between the heat storage unit 41 and the battery cell case 60. The heat conduction unit 42 conducts the heat stored by the heat storage unit 41 to the battery cell case 60.

Thus, the heat storage unit 41 receives the heat of the tab lead terminal 20 by contacting the tab lead terminal 20 and stores the heat. Thereby, it is possible to suppress heat accumulation in the tab lead terminal 20 and to delay the temperature rise of the tab lead terminal 20. The heat conducting unit 42 conducts the heat stored by the heat storage unit 41 to the battery cell case 60. Thereby, the heat of the tab lead terminal 20 is conducted to the battery cell case 60 via the heat storage part 41. As a result, it is possible to further suppress heat accumulation in the tab lead terminal 20 and further delay the temperature rise of the tab lead terminal 20. Further, even when energization to the battery unit 100 is stopped, the heat stored (stored) in the heat storage unit 41 is radiated to the battery cell case 60 having a temperature lower than that of the heat storage unit 41 via the heat conduction unit 42. Is done.

Further, in the battery unit 100, the temperature in the vicinity of the tab lead terminal 20 can be lowered. In addition, the temperature of the battery cell case 60 can also be lowered. As a result, the heat storage time of the heat storage unit 41 can be recovered.

Moreover, in the battery unit 100, only the heat storage part 41 and the heat conduction part 42 are provided, and a large structure such as a structure for circulating the heat radiation fins and the refrigerant is not required unlike the techniques described in Patent Documents 1 and 2. . For this reason, compared with the batteries described in Patent Documents 1 and 2, the battery unit 100 can be made smaller with a simple configuration.

As described above, according to the battery unit 100 of the first embodiment of the present invention, it is possible to efficiently dissipate heat generated by the terminal while suppressing the temperature rise of the terminal with a simple configuration.

Note that Patent Document 3 discloses a secondary battery or the like having an endothermic means (135) and a heat release promoting means (137). The heat absorbing means absorbs heat generated by the battery cells over almost the entire side surface of the secondary battery. The heat radiation promoting means is provided outside the heat absorbing means, and dissipates the heat temporarily absorbed by the heat absorbing means to the surrounding air.

Patent Document 3 is common to the battery unit 100 of the present embodiment in that it has a heat storage section (heat absorption means of Patent Document 3) and a heat dissipation section (heat dissipation promotion means of Patent Document 3). In addition, when radiating heat from the heat generating part (battery cell), first, the heat storage part (heat absorbing means of Patent Document 3) absorbs heat, and after the temperature rise is suppressed for a certain period of time, the heat radiating part (heat dissipation promoting means of Patent Document 3) The heat is released to the outside through.

However, the temperature rise countermeasure part is different between the present invention and Patent Document 3. That is, in the present embodiment, the tab lead terminal 20 is a countermeasure for temperature rise. On the other hand, in the invention described in Patent Document 3, the battery cell (the side surface portion 101b of the can 101 of the secondary battery 100D) is a temperature rise countermeasure portion.

In Patent Document 3, there is only a measure to suppress the temperature rise due to heat from the exterior of the battery cell, including the figure, and the heat storage unit 41 is brought into direct contact with the tab lead terminal 20 of the battery unit 100 as in this embodiment. It does not have a structure.

The battery unit 100 according to the first embodiment of the present invention further includes an external connection terminal 30. The external connection terminal 30 is connected to the tab lead terminal 20. The heat storage unit 41 is formed of an insulating member, is attached so as to contact the external connection terminal 30, receives heat from the tab lead terminal 20 through the external connection terminal 30, and stores the heat. Thus, even if the external connection terminal 30 is provided, the above-described effects can be obtained.

In addition, the battery unit 100 according to the first embodiment of the present invention includes a temperature increase suppression structure 40 formed by integrating the heat storage unit 41 and the heat conduction unit 42. Thereby, the number of parts can be reduced and the configuration of the battery unit 100 can be further simplified. As a result, the battery unit 100 can be assembled more easily.

Further, in the battery unit 100 according to the first embodiment of the present invention, when the charging time or discharging time of the battery cell 10 is shorter than the temperature rise suppression time TS, the temperature rise of the tab lead terminal 20 is made lower than a predetermined temperature. Suppress. The temperature increase suppression time TS is a time during which the heat storage unit 41 can be suppressed to a heat storage temperature α or lower, which is a temperature at which the heat of the tab lead terminal 20 can be stored.

Thus, by setting the charging time or discharging time of the battery cell 10 to be shorter than the temperature rise suppression time TS, the temperature rise of the tab lead terminal 20 can be reliably suppressed below a predetermined temperature.

Moreover, in the battery unit 100 according to the first embodiment of the present invention, the battery cell 10 is formed in a plate shape. Thereby, the battery cell 10 can be comprised easily.

<Second Embodiment>
The configuration of battery unit 100A in the second embodiment of the present invention will be described.

FIG. 5 is a perspective view showing the structure inside the battery unit 100A. FIG. 6 is a cross-sectional view showing the configuration of the battery unit 100A. In FIG. 5 and FIG. 6, constituent elements equivalent to those shown in FIGS. 1 to 4 are given the same reference numerals as those shown in FIGS.

First, an outline of the configuration of the battery unit 100A will be described.

As shown in FIG. 5 and FIG. 6, the battery unit 100A has two battery cells 10A. A battery cell case 60A is provided so as to cover the outer periphery of the battery cell 10A. Moreover, the positive electrode terminal 21a is provided at one end (upper side) of each battery cell 10A so as to protrude. A negative electrode terminal 21b is provided at the other end (lower side) of each battery cell 10A. When the positive electrode or the negative electrode is not distinguished, the positive electrode terminal 21a and the negative electrode terminal 21b are collectively referred to as a terminal 21. Further, the external connection terminal 30A is connected to one positive terminal 21a and one negative terminal 21b. The extension lead wire 30Aa is connected to both the external connection terminals 30A.

Further, the temperature rise suppression structure 40A is provided between the negative electrode terminal 21b of the upper battery cell 10A and the positive electrode terminal 21a of the lower battery cell 10A. Further, a temperature rise suppression structure 40A is also provided between the positive electrode terminal 21a of the upper battery cell 10A and the inner surface of the battery cell case 60A. Furthermore, a temperature rise suppression structure 40A is also provided between the negative electrode terminal 21b of the lower battery cell 10A and the inner surface of the battery cell case 60A.

The outline of the configuration of the battery unit 100A has been described above.

Next, details of the configuration of the battery unit 100A will be described.

As shown in FIGS. 5 and 6, the battery unit 100A includes a battery cell 10A, a positive electrode terminal 21a, a negative electrode terminal 21b, an external connection terminal 30A, an extension lead wire 30Aa, and a temperature rise suppression structure 40A. The battery cell case 60A is provided.

As shown in FIG. 5 and FIG. 6, the battery cell 10A is accommodated in the battery cell case 60A. The battery cell 10A charges or discharges electricity. Here, a cylindrical battery cell is used. 5 and 6 show two battery cells 10A connected in series. Note that the number of battery cells 10A may be two or less, or two or more.

As shown in FIGS. 5 and 6, the positive electrode terminal 21a is provided so as to protrude from one end of each battery cell 10A.

As shown in FIGS. 5 and 6, the negative electrode terminal 21b is provided at the other end of each battery cell 10A.

5 and 6, one of the two external connection terminals 30A is electrically connected to the positive terminal 21a of the battery cell 10A on the upper side of the drawing. The other of the two external connection terminals 30A is electrically connected to the negative electrode terminal 21b of the battery cell 10A on the lower side in the drawing. That is, in the example of FIGS. 5 and 6, two external connection terminals 30A are provided. One of the two external connection terminals 30A is connected to one positive terminal 21a of the two battery cells 10A. The other of the two external connection terminals 30A is connected to the other negative electrode terminal 21b of the two battery cells 10A. The extension lead wire 30Aa is connected to each of the two external connection terminals 30A. The extended lead wire 30Aa is exposed outside the battery cell case 60A.

As shown in FIGS. 5 and 6, the battery unit 100A is provided with three temperature rise suppression structures 40A.

The first temperature rise suppression structure 40A is provided between the positive electrode terminal 21a of the battery cell 10A on the upper side of the paper and the inner surface of the battery cell case 60A. The second temperature rise suppression structure 40A is provided between the terminals 21A of the connected battery cells 10A. That is, the second temperature rise suppression structure 40A is provided between the negative electrode terminal 21b of the battery cell 10A on the upper side of the paper and the positive electrode terminal 21a of the battery cell 10A on the lower side of the paper. The third temperature rise suppression structure 40A is provided between the negative electrode terminal 21b of the battery cell 10A on the lower side of the paper and the inner surface of the battery cell case 60A.

As shown in FIGS. 5 and 6, the temperature rise suppression structure 40A includes a heat storage part 41A and a heat conduction part 42A. The temperature increase suppression structure 40A is formed by integrating the heat storage part 41A and the heat conduction part 42A. As shown in FIG. 5 and FIG. 6, the temperature increase suppression structure 40A provided at the center of the three temperature increase suppression structures 40A includes an annular heat storage portion 41A and an annular heat conduction portion 42A. ,It is configured. As shown in FIG. 6, the positive electrode terminal 21a is fitted into the opening hole in the center of the annular heat storage part 41A. The annular heat storage part 41A is fitted inside the annular heat conduction part 42A. In addition, the annular heat storage portion 41A is provided between the negative electrode terminal 21b of the upper battery cell 10A and the positive electrode terminal 21a of the lower battery cell 10A. That is, the annular heat storage portion 41A is sandwiched between the negative electrode terminal 21b of the battery cell 10A on the upper side of the paper and the peripheral portion of the positive electrode terminal 21a of the battery cell 10A on the lower side of the paper. Accordingly, the heat storage unit 41A is always in thermal contact with the positive electrode terminal 21a of the lower battery cell 10A and the negative electrode terminal 21b of the upper battery cell 10A. As a result, the heat of the terminal 21 is stored in the annular heat storage unit 41A. Further, an annular heat storage portion 41A is fitted into the opening hole in the center of the annular heat conducting portion 42A. The outer peripheral portion of the annular heat storage portion 41A and the inner peripheral portion of the annular heat conducting portion 42A are thermally connected to each other. Thereby, the inner wall of the opening hole of the annular heat conducting portion 42A and the outer peripheral portion of the annular heat storage portion 41A are always in thermal contact. As a result, the heat stored in the annular heat storage part 41A is conducted to the annular heat conduction part 42A. The annular heat conducting portion 42A is thermally connected to the inner peripheral surface of the battery cell case 60A. Thereby, the heat stored in the annular heat storage part 41A is conducted to the inner peripheral surface of the battery cell case 60A via the annular heat conduction part 42A. As shown in FIG. 5 and FIG. 6, among the three temperature increase suppression structures 40A, the temperature increase suppression structure 40A provided at a location other than the center includes a disk-shaped heat storage unit 41A and a disk-shaped heat conduction unit 42A. It is comprised by the laminated body of. The disk-shaped heat storage unit 41A is connected to the external connection terminal 30A. The disc-shaped heat storage unit 41A is thermally connected to the positive electrode terminal 21a or the negative electrode terminal 21b via the external connection terminal 30A. Thereby, disk-shaped heat storage part 41A can receive the heat | fever of the terminal 21 via the external connection terminal 30A, and can store this.

The heat conduction part 42A in the top temperature rise suppression structure 40A is connected to the upper end part of the battery cell case 60A. The heat storage part 41A in the top temperature rise suppression structure 40A is connected to the external connection terminal 30A connected to the positive electrode terminal 21a of the upper battery cell 10A.

Also, the heat conduction part 42A in the lowest temperature rise suppression structure 40A is connected to the inner surface of the lower end part of the battery cell case 60A. The heat storage part 41A in the lowest temperature rise suppression structure 40A is connected to the external connection terminal 30A connected to the negative electrode terminal 21b of the lower battery cell 10A. Each heat storage part 41A is formed of an insulating member (for example, a resin member). As shown in FIGS. 5 and 6, the heat storage unit 41 A is provided so as to contact the terminal 21 or the external connection terminal 30 A. The heat storage unit 41A receives the heat of the terminal 21 and stores the heat. The heat storage unit 41 A receives the heat of the terminal 21 through the external connection terminal 30 and stores the heat. The heat storage unit 41A is also referred to as a heat storage insulating resin.

As shown in FIG. 5 and FIG. 6, the heat conducting portion 42A thermally connects the heat storage portion 41A and the battery cell case 60A. The heat conducting unit 42A conducts the heat of the terminal 21 stored by the heat storage unit 41A to the battery cell case 60A.

As shown in FIG. 5 and FIG. 6, the battery cell case 60A accommodates the battery cell 10A. Battery cell case 60A is formed using a heat conductive member.

The details of the configuration of the battery unit 100A have been described above.

Next, a method for manufacturing the battery unit 100A will be described.

First, the above-described two temperature rise suppression structures 40A are created by superimposing and integrating the disk-shaped heat storage unit 41A and the disk-shaped heat conduction unit 42A. Moreover, one temperature rise suppression structure 40A is created by fitting the annular heat storage portion 41A into the opening hole in the center of the annular heat conducting portion 42A.

The heat storage section 41A is made by kneading and preparing a heat storage material corresponding to a temperature at which temperature rise is desired to be suppressed in a liquid resin having high insulation properties, and then curing it. For example, an epoxy resin, a silicone resin, a phenol resin, a polyimide resin, or the like is used as the liquid resin having a high insulating property. Examples of the heat storage material corresponding to the temperature at which the temperature rise is to be suppressed include, for example, paraffin-containing capsule powder, water-containing capsule powder, sodium acetate / trihydrate-containing capsule powder, lithium nitrate / trihydrate-containing capsule powder , Stearic acid-containing capsule powder, cetyl alcohol-containing capsule powder, and the like are used. The heat conducting portion 42A is made of a heat radiating sheet (for example, copper, aluminum, gold, silver, graphite sheet, etc.) having high heat conductivity.

Next, as shown in FIGS. 5 and 6, three temperature rise suppression structures 40 A and external connection terminals 30 A are arranged.

As a result, one of the temperature rise suppression structures 40A configured by the laminated body of the disk-shaped heat storage section 41A and the disk-shaped heat conduction section 42A is the positive terminal 21a of the battery cell 10A on the upper side of the paper and the battery cell case 60A. It is arrange | positioned between the inner surfaces of. At this time, the disk-shaped heat storage part 41A of the temperature rise suppression structure 40A is thermally connected to the positive electrode terminal 21a of the battery cell 10A on the upper side in FIG. 6 via the external connection terminal 30A. Further, the disk-shaped heat storage part 41A of the temperature increase suppression structure 40A is also thermally connected to the disk-shaped heat conduction part 42A. Further, the disk-shaped heat conducting portion 42A of the temperature rise suppression structure 40A is thermally connected to the disk-shaped heat storage portion 41A and the inner surface of the battery cell case 60A.

Similarly, another temperature rise suppression structure 40A constituted by a laminated body of a disk-shaped heat storage section 41A and a disk-shaped heat conduction section 42A is the negative electrode of the battery cell 10A on the lower side of the paper in FIG. It arrange | positions between the terminal 21b and the inner surface of battery cell case 60A. At this time, the disk-shaped heat storage part 41A of the temperature increase suppression structure 40A is thermally connected to the negative electrode terminal 21a of the battery cell 10A on the lower side of the drawing via the external connection terminal 30A. Further, the disk-shaped heat storage part 41A of the temperature increase suppression structure 40A is also thermally connected to the disk-shaped heat conduction part 42A. Further, the disk-shaped heat conducting portion 42A of the temperature rise suppression structure 40A is thermally connected to the disk-shaped heat storage portion 41A and the inner surface of the battery cell case 60A.

Furthermore, the temperature rise suppression structure 40A configured by a combination of the annular heat storage portion 41A and the annular heat conduction portion 42A includes a negative electrode terminal 21b of the battery cell 10A on the upper side of the paper in FIG. 6 and a lower side of the paper in FIG. Between the battery cell 10A and the positive electrode terminal 21a. At this time, the annular heat storage portion 41A of the temperature rise suppression structure 40A is thermally connected between the negative electrode terminal 21b of the battery cell 10A on the upper side of the paper in FIG. 6 and the positive electrode terminal 21a of the battery cell 10A on the lower side of the paper in FIG. Connect to. Further, the annular heat conducting portion 42A of the temperature rise suppression structure 40A is thermally connected to the annular heat storage portion 41A and the inner surface of the battery cell case 60A.

Next, as shown in FIGS. 5 and 6, the extension lead wire 30Aa is connected to the external connection terminal 30A.

Finally, as shown in FIGS. 5 and 6, the battery cell case 60A is used to enclose the battery cell 10A and the like. At this time, each member is arranged so that one end of the extension lead wire 30Aa is exposed to the outside of the battery cell 10A.

The method for manufacturing the battery unit 100A has been described above.

Next, a usage example of the battery unit 100A will be described. The usage example of the battery unit 100A is the same as that described with reference to FIGS.

As described above, the battery unit 100A according to the second embodiment of the present invention includes the battery cell 10A, the battery cell case 60A, the terminal 21, the heat storage unit 41A, and the heat conduction unit 42A.

The battery cell 10A charges or discharges electricity. Battery cell case 60A accommodates battery cell 10A. The terminal 21 is connected to the battery cell 10A. The heat storage unit 41A is formed of an insulating member, is attached so as to contact the terminal 21, receives heat from the terminal 21, and stores the heat. The heat conducting part 42A connects between the heat storage part 41A and the battery cell case 60A. The heat conducting unit 42A conducts the heat stored by the heat storage unit 41A to the battery cell case 60A. Since this configuration is the same as that of the battery unit 100 in the first embodiment, the same effect as that of the battery unit 100 in the first embodiment can be obtained.

The battery unit 100A according to the second embodiment of the present invention further includes an external connection terminal 30A. The external connection terminal 30A is connected to the terminal 21. The heat storage unit 41A is formed of an insulating member, is attached so as to be in contact with the external connection terminal 30A, receives heat from the terminal 21 through the external connection terminal 30A, and stores the heat. Since this configuration is the same as that of the battery unit 100 in the first embodiment, the same effect as that of the battery unit 100 in the first embodiment can be obtained.

Further, the battery unit 100A in the second embodiment of the present invention includes a temperature increase suppression structure 40A formed by integrating the heat storage unit 41A and the heat conduction unit 42A. Since this configuration is the same as that of the battery unit 100 in the first embodiment, the same effect as that of the battery unit 100 in the first embodiment can be obtained.

Further, in the battery unit 100A according to the second embodiment of the present invention, when the charging time or discharging time of the battery cell 10A is shorter than the temperature increase suppression time TS, the temperature increase of the terminal 21 is suppressed below a predetermined temperature. To do. The temperature increase suppression time TS is a time during which the heat storage unit 41A can be suppressed to a heat storage temperature α or lower, which is a temperature at which the heat of the terminal 21 can be stored. Since this configuration is the same as that of the battery unit 100 in the first embodiment, the same effect as that of the battery unit 100 in the first embodiment can be obtained.

Further, in the battery unit 100A according to the first embodiment of the present invention, the battery cell 10A is formed in a columnar shape. Thereby, the battery cell 10A can be configured easily.

Here, although the Example regarding the 1st and 2nd embodiment of this invention is shown, it is not restrict | limited to the following manufacturing methods and usage methods.
[Example 1]
A manufacturing method of Example 1 of the battery unit 100 according to the first embodiment will be described. The battery unit 100 is also called a laminate type secondary battery.

As shown in FIG. 1 and FIG. 2, the detailed structure of the temperature rise suppression structure 10 was manufactured as follows.

First, the heat storage unit 41 was manufactured as follows. That is, first, a heat storage microcapsule of 5 micrometers (μm) to 50 micrometers (μm) is added to a one-part polyimide resin to which insulation is imparted after the resin is cured at a ratio of 20 wt% to 40 wt%. Knead and prepare. As the heat storage microcapsules, those having a shell made of polymethyl methacrylate and paraffin as a core are used. Thereafter, the one-component polyimide resin kneaded and prepared is cured. Thereby, the heat storage part 41 was obtained.

In the manufacture of the heat conducting portion 42, a graphite sheet having a thickness of 5 micrometers (μm) to 150 micrometers (μm) was used. The graphite sheet of the heat conducting portion 42 is used to dissipate heat from the heat storage portion 41 where the heat generated from the tab lead terminal 20 when the battery unit 100 is energized is stored. Depending on the electrode gap, a carbon fiber-containing elastomer or a boron nitride-containing elastomer can also be used for manufacturing the heat conducting portion 42. When a sheet of carbon fiber-containing elastomer or boron nitride-containing elastomer is used as the material of the heat conducting portion 42, a sheet having a thickness of 50 micrometers (μm) to 10 millimeters (mm) can be used.

In the manufacture of the positive electrode tab lead terminal 20a and the negative electrode tab lead terminal 20b, a conductive member such as copper was formed in a plate shape.

銅 Copper was used as the material for the external connection terminal 30. One end of the external connection terminal 30 is connected to the tab lead terminal 20. The other end of the external connection terminal 30 is connected to a charging device (not shown) or an external load device (not shown).

銅 Copper was used as the material for the inter-terminal conductor 50. The inter-terminal conductor 50 is used for connecting the tab lead terminals 20.

Then, as described in the first embodiment, these members are assembled to complete the battery unit 100.

Here, in the method of installing the components of the temperature rise suppression structure 40, the gap generated when the battery cells 10 are stacked (in FIG. 2, the gap between the battery cell 10 on the upper side of the paper and the battery cell 10 at the center of the paper) The gap between the battery cell 10 in the center of the paper surface and the battery cell 10 on the lower side of the paper surface was 1.5 mm to 2.0 mm. Then, as shown in FIG. 2, a gap between the heat storage part 41 and the heat conduction part 42 or an inter-terminal conductor 50 for connecting the tab lead terminals 20 is inserted into the gap. Each component thickness is the maximum value that can be inserted. The heat conducting part 42 was brought into contact with the battery cell case 60.
[Example 2]
A manufacturing method of Example 2 of battery unit 100A in the second embodiment will be described. The battery unit 100 is also called a cylindrical secondary battery.

As shown in FIGS. 5 and 6, the detailed structure of the temperature rise suppression structure 10A was manufactured as follows.

First, the heat storage part 41A was manufactured as follows. That is, first, a heat storage microcapsule of 5 micrometers (μm) to 50 micrometers (μm) is added to a one-part polyimide resin to which insulation is imparted after the resin is cured at a ratio of 20 wt% to 40 wt%. Knead and prepare. As the heat storage microcapsules, those having a shell made of polymethyl methacrylate and paraffin as a core are used. Thereafter, the one-component polyimide resin kneaded and prepared is cured. Thereby, 41 A of heat storage parts were obtained.

In the manufacture of the heat conducting portion 42A, a graphite sheet having a thickness of 5 micrometers (μm) to 150 micrometers (μm) was used. The graphite sheet of the heat conducting portion 42A is used to dissipate heat from the heat storage portion 41A where the heat generated from the terminals 20 when the battery unit 100A is energized is stored. Depending on the electrode gap, a carbon fiber-containing elastomer or a boron nitride-containing elastomer can also be used for manufacturing the heat conducting portion 42. When a sheet of carbon fiber-containing elastomer or boron nitride-containing elastomer is used as the material of the heat conducting portion 42, a sheet having a thickness of 50 micrometers (μm) to 10 millimeters (mm) can be used.

In manufacturing the positive electrode terminal 21a and the negative electrode terminal 21b, a conductive member such as copper was formed in a plate shape.

銅 Copper was used as the material for the external connection terminal 30A. One end of the external connection terminal 30 A is connected to the terminal 20. The other end of the external connection terminal 30A is connected to the extension lead wire 30Aa. The extension lead wire 30Aa is connected to a charging device (not shown) or an external load device (not shown).

Then, as described in the second embodiment, these members are assembled to complete the battery unit 100A.

Here, in the method of installing the constituent parts of the temperature rise suppression structure 40A, a gap generated when the battery cells 10A are connected (in FIG. 6, the gap between the battery cell 10A on the upper side of the paper and the battery cell 10A on the lower side of the paper). ) And the like, in which the heat storage part 41 and the heat conduction part 42 are stacked. Moreover, what made the thermal storage part 41A and the heat conduction part 42 contact was set | placed on one side of the external connection terminal 30A. The heat conducting part 42 was brought into contact with the battery cell case 60.
[Example 3]
Regarding the operation of the battery unit 100, an example in which charging or discharging is performed in a time longer than the temperature rise suppression time TS will be described with reference to FIG.

First, power was supplied from the external connection terminal 30 to the battery unit 100 in the energized state stopped by an external power source (not shown).

Next, a transition from the energization stop state to the charge state is performed, or an external load device (not shown) is connected to the already connected battery unit 100 to the external connection terminal 30 to shift from the energization stop state to the discharge state. .

As a result, the terminal 20 which was 25 ° C. when the energization was stopped generated heat. Thereby, the temperature of the terminal 20 rose.

After that, as shown in FIG. 3, the temperature of the terminal 20 is 39 ° C. by the heat storage portion 42 (here, a 39 ° C. heat storage material is used) included in the heat storage portion 41 of the temperature rise suppression structure 40. To 42 ° C. Thereby, the temperature increase suppression period TS occurred.

At this time, heat was gradually released from the heat conducting portion 42 toward the battery cell case 60 at the same time.

As a result of further continued heat generation at the terminal 20, the temperature of the terminal 20 exceeded the temperature increase suppression period TS, and the temperature increased again.
[Example 4]
Regarding the operation of the battery unit 100, an example in which charging or discharging is performed in a time shorter than the temperature rise suppression time TS will be described with reference to FIG.

Next, a transition from the energization stop state to the charge state is performed, or an external load device (not shown) is connected to the already connected battery unit 100 to the external connection terminal 30 to shift from the energization stop state to the discharge state. . As a result, the terminal 20 that was 25 ° C. when the energization was stopped generated heat. Thereby, the temperature of the terminal 20 rose.

Thereafter, as shown in FIG. 4, the temperature of the terminal 20 is 39 ° C. by the heat storage portion 42 (here, a 39 ° C. heat storage material is used) included in the heat storage portion 41 of the temperature rise suppression structure 40. To 42 ° C. Thereby, the temperature increase suppression period TS occurred.

The temperature increase suppression period TS depends on the amount of latent heat that the heat storage unit 41 has. And when the thing which can hold | maintain the temperature of the tab lead terminal 20 for 300 second is used as the temperature increase suppression period TS, if the energization stop to the tab lead terminal 20 is stopped in 30 seconds, the heat generation of the terminal 20 stops. As a result, heat only flows out from the heat conducting portion 42 toward the battery cell case 60, and thus the temperature of the terminal 20 is lowered.

The present invention has been described above based on the embodiments. The embodiment is an exemplification, and various changes, increases / decreases, and combinations may be added to the above-described embodiments without departing from the gist of the present invention. It will be understood by those skilled in the art that modifications to which these changes, increases / decreases, and combinations are also within the scope of the present invention.

This application claims priority based on Japanese Patent Application No. 2014-113874 filed on June 2, 2014, the entire disclosure of which is incorporated herein.

10, 10A battery cell 20 tab lead terminal 21 terminal 20a positive electrode tab lead terminal 20b negative electrode tab lead terminal 21a positive electrode terminal 21b

negative electrode terminal

30, 30A external connection terminal 30Aa

extension lead wire

40, 40A temperature rise

suppression structure

41, 41A

heat storage part

42, 42A Thermal conduction part 50 Inter-terminal conductor 60 Battery cell case 100 Battery unit

Claims

Battery cells that charge or discharge electricity;
A battery cell case that houses the battery cell;
A terminal provided in the battery cell;
A heat storage unit that is formed of an insulating member, is attached so as to be in contact with the terminal, receives heat from the terminal, and stores the heat;
A battery unit comprising: a heat conduction unit that connects between the heat storage unit and the battery cell case and conducts heat stored by the heat storage unit to the battery cell case.
An external connection terminal connected to the terminal;
The battery unit according to claim 1, wherein the heat storage unit is formed of an insulating member, is attached to be in contact with the external connection terminal, receives heat from the terminal via the external connection terminal, and stores the heat.
3. The battery unit according to claim 1, further comprising a temperature rise suppression structure formed by integrating the heat storage unit and the heat conduction unit.
When the charging time or discharging time of the battery cell is shorter than a temperature rise suppression time that is a time during which the heat storage unit can be suppressed to a heat storage temperature that is a temperature at which the heat of the terminal can be stored, or shorter, The battery unit according to any one of claims 1 to 3, wherein the temperature rise of the terminal is suppressed below a predetermined temperature.
The battery unit according to any one of claims 1 to 4, wherein the battery cell is formed in a plate shape or a column shape.