JP6192467B2 - Assembled battery - Google Patents

Description

  The present invention relates to an assembled battery.

In general, a lithium ion secondary battery (hereinafter referred to as “storage element”) is used as an electric module (assembled battery) by connecting a plurality of storage elements in order to increase the capacity of the battery. This assembled battery is configured by bringing a plurality of power storage elements in close proximity or as close as possible to increase the energy density per volume.
However, when a plurality of power storage elements are in close contact with each other or close to each other, heat is generated during charging and discharging, resulting in a high temperature, which may shorten the life of the assembled battery. In particular, in an assembled battery, heat is likely to be accumulated in each internal storage element, and the life is likely to be shortened.

Therefore, conventionally, as shown in Patent Document 1, for example, an assembled battery considering heat dissipation has been proposed.
In the battery pack of Patent Document 1, a positive electrode terminal and a negative electrode terminal are formed to protrude from an exterior material formed by lamination, and the protruding portion of the terminal is bent in an L shape toward a power storage element arranged adjacent to the terminal. Yes.
The energy storage elements adjacent to each other are arranged at an interval, and the positive electrode terminal of one energy storage element and the bent portion of the negative electrode terminal of the other energy storage element are connected to face each other.

  And in patent document 1, all the electrical storage elements and assembled batteries are cooled by sending cooling air to an electrical storage element, and applying this cooling wind to the comparatively wide surface of the bending part of a positive electrode terminal and a negative electrode terminal. Yes.

JP 2005-190885 A

However, in Patent Document 1, since the adjacent power storage elements are connected only at the terminals, when the assembled battery receives an external impact, a load is locally applied to the connected terminals. As a result, the connecting portion is easily damaged, and the stability of the assembled battery structure is poor.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an assembled battery having a stable structure by effectively protecting each power storage element while preventing deterioration of the power storage element due to heat.

The assembled battery of the present invention includes a plurality of power storage elements in which positive plates and negative plates are alternately stacked via an electrolyte, the plurality of power storage elements being arranged at intervals, and the plurality of power storage elements A flat separator having a cooling function is interposed between the two , the separator contacts the entire surface of the opposing surfaces of the electricity storage elements arranged adjacent to each other , and the separator has a thickness of the separator. A through hole penetrating in a direction orthogonal to the direction is formed so as to be distributed substantially evenly over the entire cross section of the separator .
According to the assembled battery of the present invention, with the respective storage element can be cooled by a separator, the separator is, for abutting the entire surface of the opposing surfaces of the storage element, to be substantially uniformly supports the entire storage element it can.
Moreover, according to the above-mentioned structure, the heat conducted to the separator can be efficiently radiated from the inner wall surface forming the through hole.

The assembled battery according to the present invention preferably has no heat generating means between the electricity storage element and the separator.

The assembled battery of the present invention includes a plurality of power storage elements in which positive plates and negative plates are alternately stacked via an electrolyte, the plurality of power storage elements being arranged at intervals, and the plurality of power storage elements A flat separator having a cooling function is interposed between the two, the separator contacts the entire surface of the opposing surfaces of the storage elements arranged adjacent to each other, and the separator is formed in a honeycomb structure. It is characterized by that .
According to this structure, the heat conducted to the separator can be efficiently radiated.

The battery element of the assembled battery according to the present invention may include an exterior material including a laminate.
According to this structure, since the exterior material is provided with the flexible laminate, it can follow the shape of the separator and can efficiently contact the separator.

The battery element of the assembled battery according to the present invention may be a cylindrical battery element.
According to this configuration, deterioration of the cylindrical battery due to heat can be prevented, and the power storage element can be effectively protected.

  According to the present invention, it is possible to prevent the storage element from being deteriorated (or shortened life) by removing the heat generated from the storage element using the separator, and each separator is effectively protected by the separator. There is an effect that the stability of the structure of the battery can be maintained.

It is sectional drawing which showed typically the assembled battery which concerns on one Embodiment of this invention. It is sectional drawing which showed the modification of the separator which comprises the assembled battery which concerns on one Embodiment of this invention. It is sectional drawing which showed the modification of the separator which comprises the assembled battery which concerns on one Embodiment of this invention. It is a schematic diagram which shows the modification of the assembled battery which concerns on one Embodiment of this invention. It is a schematic diagram which shows the modification of the assembled battery which concerns on one Embodiment of this invention.

Hereinafter, an assembled battery according to an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the assembled battery 1 of the present embodiment includes a plurality of power storage elements 2,... And a separator 4 a that is interposed between the plurality of power storage elements 2 and 2 and has a cooling function. ing. In the present embodiment, the power storage elements 2 and the separators 4a are alternately stacked in the stacking direction.

  The power storage element 2 is formed by sealing positive and negative electrode plates alternately stacked via an electrolyte (not shown) with an exterior material 5 having a laminate, and projecting a positive electrode terminal 6 and a negative electrode terminal 7 from both ends of the exterior material 5. It has been made.

The power storage elements 2 are arranged at a plurality of intervals in the thickness direction, and a separator 4a having a cooling function is provided between the power storage elements 2 and 2 adjacent to each other in the stacking direction (also in the thickness direction). It is intervened.
The positive electrode terminal 6 and the negative electrode terminal 7 protruding from each exterior material 5 are bundled together for each positive electrode terminal 6 or negative electrode terminal 7 and connected in parallel to form one assembled battery 1.

The separator 4a is a flat member in which both surfaces facing the power storage element 2 are formed as flat plate surfaces, and the thickness between both surfaces is formed to a predetermined dimension, such as aluminum having high thermal conductivity. It is made of a solid material such as metal, ceramic, silicon, glass, or a carbon nanotube-containing resin plate.
The external dimension of the surface of the separator 4a in plan view is formed to be approximately the same as the external dimension of the exterior member 5 of the power storage element 2 in plan view.

  Under this configuration, the separator 4a is positioned at an interval in the stacking direction, and the entire surface (opposite surface) of the exterior member 5 of the power storage element 2 with the power storage element 2 sandwiched between the separators 4a and 4a. It contacts with almost no gap. As a result, the electric storage element 2 is supported so as to always maintain a constant thickness dimension as a whole between the separators 4a, 4a adjacent in the stacking direction.

Next, the heat radiation effect of the assembled battery 1 having the above configuration will be described.
When the battery pack 1 is energized and electricity is charged and discharged, each storage element 2 generates heat and tries to increase its temperature. However, since the assembled battery 1 is provided with a separator 4a that is in close contact with the surface of the exterior member 5 and can receive heat from the power storage element 2 between the power storage elements 2, 2,. Heat can be quickly removed to prevent or cool the power storage element 2. And the heat obtained from the electrical storage element 2 can be radiated at the end of the separator 4a not in contact with the electrical storage element 2.
The heat radiation of the separator 4a can be efficiently radiated from the power storage element 2 by connecting the separator 4a to air or other refrigerant.

Further, since the separators 4a and 4a are interposed between the power storage elements 2, 2,... And are in close contact with the entire surface of the exterior member 5, the thickness dimension of the power storage element 2 is always maintained substantially constant. Can be supported.
Therefore, according to the assembled battery 1, heat can be effectively radiated, that is, cooled by the separators 4a, 4a,... Interposed between the power storage elements 2, 2,. It is possible to obtain an effect that it can be held and held. Further, since the battery pack 1 includes the flexible laminate, the battery pack 1 can be effectively brought into contact with the separator 4a by following the shape of the separator 4a.

  Next, a modification of one embodiment of the present invention will be described. In Modifications 1 to 4 described below, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

(Modification 1)
First, Modification 1 will be described with reference to FIG.
The assembled battery of Modification 1 is different from the above-described embodiment in that through holes 3b, 3b,... Are formed in the separator 4a of the assembled battery 1 shown in FIG.

  As shown in FIG. 2, the separator 4b of the first modification is formed by an inner peripheral surface having a circular cross section in a direction orthogonal to the thickness direction of the separator 4b (that is, parallel to the extending direction of the surface of the separator 4b). Through holes 3b, 3b,.

The through holes 3b, 3b,... Are formed so as to be distributed substantially evenly over the entire cross section of the separator 4b. The through-hole 3b constitutes a flow path through which a cooling medium such as cooling air or cooling water can be inserted to promote heat dissipation of the electricity storage element 2, and by forming a space inside the separator 4b The separator 4b is given elasticity. And the separator 4b is formed in the substantially same magnitude | size as the whole surface of the electrical storage element 2. FIG.
On the other hand, the surface of the separator 4b is formed on a flat plate surface so that it can be in close contact with the entire surface of the exterior member 5 of the power storage element 2.

  Therefore, according to the assembled battery 1 including the separator 4b of the first modification, the heat generated in the power storage element 2 is efficiently received by the surface of the separator 4b and the through holes 3b, 3b,... Are formed. Heat can be radiated more efficiently from the inner peripheral surface of 4b. In addition, when an impact force or the like is applied to the assembled battery 1, the impact force can be alleviated by receiving the impact force in the entirety of the separator 4 b and absorbing or dispersing the external force. Therefore, it is possible to more effectively prevent deterioration of the electricity storage device 2 due to the temperature rise of the electricity storage device 2, and to reduce and protect the influence on the electricity storage device 2 when an impact force is applied. The effect is obtained.

(Modification 2)
Next, a second modification of the present invention will be described with reference to FIG.
The assembled battery of Modification 2 is different from the above-described embodiment in that the separator 4a of the assembled battery 1 shown in FIG. 1 is formed in a honeycomb structure as shown in FIG. The separator 4c has the same configuration as that of the modified example 1 except that a through hole 3c formed by being surrounded by an inner wall having a hexagonal cross section is formed.

According to this configuration, since the separator 4c is formed in a honeycomb structure, a large number of through holes 3c, 3c,... Can be efficiently formed in the separator 4c, and the through holes 3c formed by the separator 4c can be formed. A cross-sectional area can be formed efficiently large. Further, the strength of the separator 4c can be increased.
On the other hand, the surface layer portion of the separator 4c is formed of a plate member having a flat outer surface and an uneven thickness along the shape of the honeycomb.

Therefore, according to the assembled battery 1 provided with the separator 4c, the surface of the separator 4c is brought into contact with the entire surface of the exterior member 5 of the electricity storage element 2 to efficiently receive heat, and heat is quickly applied to the inside formed in the honeycomb structure. Further, heat can be efficiently radiated from the inner wall surface forming the through-hole 3 formed with dimensional efficiency.
Therefore, the effect of the first modification can be obtained, and at the same time, the heat of the power storage element 2 can be removed more efficiently than the first modification, and the impact force can be uniformly dispersed in the honeycomb structure separator 4c. 2 can be protected.

(Modification 3)
Next, the assembled battery 10 of the modification 3 is demonstrated using FIG.
In the assembled battery 10 of Modification 3, the shape of the separator 4d is formed in a wave shape and is in partial contact with the power storage element 2, and between the corrugated separator 4d and the outer packaging material 5 of the power storage elements 2 and 2. A through hole 3d penetrating in one direction is formed.
Specifically, the through-hole 3 d is formed between the concave strip portion 11 of the separator 4 a and the exterior material 5.

  Further, the separator 4d is in partial contact with the surface (opposing surface) of the exterior member 5 so that the contact portions are dispersed throughout. More specifically, the separator 4d is in contact with the exterior material 5 at a substantially constant interval in a direction crossing the forming direction of the through hole 3d. In other words, the separator 4 d supports the power storage element 2 over the entire surface of the exterior material 5 at regular intervals.

According to the configuration of the assembled battery 10, the heat of the power storage element 2 can be removed through the corrugated separator 4 d, and the heat can be efficiently radiated to the large through-hole 3 d. Moreover, since the separator 4d formed in a waveform can exhibit an elastic force more than the separators 4b and 4c of the first and second modifications, the buffering force is higher.
Therefore, it is possible to prevent the assembled battery 10 from being deteriorated by heat and to obtain an effect that the assembled battery 10 can be more effectively protected.

(Modification 4)
Next, the assembled battery 12 of the modification 4 is demonstrated using FIG.
FIG. 5 is a plan view of the assembled battery 12. The assembled battery 12 of the fourth modification includes a plurality of cylindrical storage elements 13 arranged at predetermined intervals, and separators 4e and 4f are interposed between the storage elements 13 and 13. It is configured.

  The separator 4e is a rectangular flat plate member having a predetermined thickness dimension. The vertical (height) dimension (dimension in the depth direction of the drawing) of the plate surface of the separator 4e is the same as the height dimension (dimension in the axial direction of the cylindrical shape) of the electricity storage element 13, and the horizontal (width) dimension. Is appropriately set depending on the dimension between both end portions of the plurality of power storage elements 13 arranged adjacent to each other. In this modification, the storage elements 13 are formed in dimensions that can be brought into contact with the two storage elements 13 when they are arranged in two rows.

The separator 4f is formed in the same manner as the separator 4e, except that the width dimension is larger than that of the separator 4e.
As the internal structure of the separators 4e and 4f, the separator 4a of the above-described embodiment or the separators 4b to 4d of Modifications 1 to 3 can be used as appropriate, and the separators 4b to 4d provided with the through holes 3b to 3d are applied. In this case, it is possible to increase the heat radiation efficiency by appropriately inserting a refrigerant through the through holes 3b to 3d.

Under the above configuration, the separators 4e and 4f are assembled in a substantially lattice shape in a plan view in a state where they are erected. The electric storage elements 13, 13,... Are arranged in a space S formed between the separators 4e, 4f so that the surface in contact with the separators 4e, 4f is as large as possible.
According to the assembled battery 12 of the fourth modification having the above-described configuration, as with the assembled battery 1 according to the embodiment or the assembled battery 10 described in the modification, the tubular storage element 13 is prevented from being deteriorated due to heat generation. In addition, it is possible to protect the cylindrical power storage element 13 from the impact force.

As mentioned above, although one embodiment of the assembled battery of the present invention has been described, the present invention is not limited to the configuration shown in the above embodiment, and can be changed without departing from the spirit of the present invention.
For example, in the above-described embodiment and Modifications 1 to 3, the separators 4a to 4d have been described as having the same surface area as the surface area of the exterior material 5 of the power storage element 2, but the separators 4a to 4d are exterior materials. 5 may be configured such that the end portions of the separators 4a to 4d protrude from the outer end of the storage element 2 when the storage element 2 is sandwiched between the separators 4a to 4d.

By configuring in this way, the effect that the heat of the electricity storage element 2 can be efficiently released from the end portions of the separators 4a to 4d that are not in contact with the electricity storage element 2 is obtained.
The assembled batteries 1, 10, and 12 are configured using the same type of separators 4 a to 4 d between the plurality of power storage elements 2, 2. Two or more kinds of batteries 1 and 10 may be used in combination in consideration of the temperature rise distribution, heat receiving efficiency and heat radiation efficiency as appropriate.
Moreover, this invention matches the external shape of separator 4a-4d with the shape of electrical storage elements other than the flat electrical storage element 2 of FIG. 1, FIG. For example, the present invention can also be applied to a square shape or a button shape.

DESCRIPTION OF SYMBOLS 1,10,12 ... Assembly battery, 2 ... Power storage element, 3 ... Flow path, 4a-4f ... Separator, 5 ... Exterior body

Claims (5)

A plurality of power storage elements in which positive plates and negative plates are alternately stacked via an electrolyte,
The plurality of power storage elements are arranged at intervals, and a plate-shaped separator having a cooling function is interposed between the plurality of power storage elements,
The separator abuts against the entire surface of the opposing surfaces of the electricity storage elements arranged next to each other ,
The assembled battery is characterized in that the separator is formed with through holes penetrating in a direction perpendicular to the thickness direction of the separator so as to be distributed substantially evenly over the entire cross section of the separator . A plurality of power storage elements in which positive plates and negative plates are alternately stacked via an electrolyte,
The plurality of power storage elements are arranged at intervals, and a plate-shaped separator having a cooling function is interposed between the plurality of power storage elements,
The separator is to contact the entire surface of the opposing surfaces of the electricity storage device to each other, which are arranged next to each other,
The assembled battery, wherein the separator is formed in a honeycomb structure. 3. The assembled battery according to claim 1, wherein no heating means is provided between the power storage element and the separator. The assembled battery according to any one of claims 1 to 3 , wherein the power storage element is formed of an exterior material including a laminate. The storage element is assembled battery according to any one of claims 1 to 3, characterized in that the storage element of the cylindrical mold.

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