JP2018056092A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery module capable of preventing degradation thereof due to temperature raise by easily radiating heat generated inside of the battery due to charging and discharging even when the battery module is resin molded.SOLUTION: A battery module 200 includes plural square secondary batteries 100 which are laminated each other with the plane having terminal 11 aligned with each other. The square secondary batteries are resin molded 90 in a state the terminals and at least a plane other than the plane on which the terminals are disposed are exposed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a battery module in which a plurality of secondary batteries are integrated.

  From the viewpoint of cost reduction, a structure that does not have a positive cooling mechanism, such as air cooling using a fan or liquid cooling using a cooling plate, may be adopted to dissipate the heat generated by charging and discharging by natural cooling. . In the case of natural cooling, if an air layer exists around the prismatic secondary battery, the thermal resistance increases and the temperature rise increases. In addition, since the cell holder used for positioning and fixing the prismatic secondary battery tends to be costly due to its complicated structure, the cell holder may be replaced with a resin mold to reduce the cost. If a rectangular secondary battery module is formed by collectively molding a plurality of prismatic secondary batteries, the air layer around the square secondary battery can be eliminated, and at the same time, the cost can be reduced.

  As background art of this technical field, there is, for example, Patent Document 1. This publication states that “a battery cell container is a non-cured thermoset by an isotropic pressing method in which a plurality of battery cells are immersed in an uncured thermosetting resin material or a melted thermoplastic resin material. It is formed by curing an adhesive resin material or a molten thermoplastic resin material. "

JP 2009-266740 A

  Patent Document 1 has a structure in which the entire surface of a rectangular secondary battery module is covered with resin by a resin mold. However, although heat is more easily transmitted than air, resin generally has a low thermal conductivity, so The thermal resistance with the outside of the secondary battery module is not sufficiently reduced. As a result, the temperature rise increases due to heat generation inside the battery due to charge and discharge, and the performance is likely to deteriorate, so it is necessary to improve the heat dissipation.

In order to solve the above problems, the present invention employs, for example, the configurations described in the claims.
The present application includes a plurality of means for solving the above-mentioned problems. To give an example, “a plurality of prismatic secondary batteries having terminals arranged on one surface are stacked so that the surfaces having the terminals are aligned. In the battery module,
The rectangular secondary batteries are resin-molded with the terminals and at least one surface other than the surface on which the terminals are disposed exposed.

  By charging / discharging the cell by bringing the heat sink into contact with the exposed surface of the resin-molded prismatic secondary battery module with at least one of the surfaces of the prismatic secondary battery other than the surface on which the terminals are formed exposed. Heat can be efficiently radiated and temperature rise can be suppressed.

The external appearance perspective view of a square secondary battery. The top view of the square secondary battery module in Example 1 Side view of prismatic secondary battery module in Example 1 The top view of the square secondary battery module in Example 2 Side view of the square secondary battery module in Example 2 The top view of the square secondary battery module in Example 3 Side view of the prismatic secondary battery module in Example 3 The top view of the square secondary battery module in Example 4 Side view of prismatic secondary battery module in Example 4 The top view of the square secondary battery module in Example 5 The top view of the square secondary battery module in Example 6

  Hereinafter, examples will be described with reference to the drawings.

Example 1
Hereinafter, embodiments of a rectangular secondary battery module according to the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of a prismatic secondary battery 100 as one embodiment.

  As shown in FIG. 1, the rectangular secondary battery 100 includes a battery container including a battery can 1 and a battery lid 6. The material of the battery can 1 and the battery lid 6 is aluminum or an aluminum alloy. The battery can 1 is formed into a flat rectangular box shape having one end opened by performing deep drawing. The battery can 1 has a rectangular flat plate-like bottom surface 1d, a pair of wide side surfaces 1b provided on each of the pair of long side portions of the bottom surface 1d, and a pair of narrow width portions provided on each of the pair of short side portions of the bottom surface 1d. And a side surface 1c.

  The battery lid 6 has a rectangular flat plate shape and is laser-welded so as to close the opening of the battery can 1. That is, the battery lid 6 seals the opening of the battery can 1. Further, the battery lid 6 is provided with a positive electrode terminal 12 and a negative electrode terminal 14 which are a pair of electrode terminals via an insulator 22 to constitute a lid assembly. In addition to the positive electrode terminal 12 and the negative electrode terminal 14, the battery lid 6 has a gas discharge valve 10 that is opened when the pressure in the battery container 2 rises above a predetermined value and discharges the gas in the battery container 2; A liquid injection port for injecting an electrolytic solution into the battery container 2 is disposed. The liquid injection port provided in the battery cover 6 is sealed by injecting an electrolytic solution and then welding a liquid injection stopper 9.

  The gas discharge valve 10 provided in the battery lid 6 is formed by partially thinning the battery lid 6 by press working. The thin-walled member may be attached to the opening of the battery lid 6 by laser welding or the like, and the thin portion may be used as a gas discharge valve. The gas discharge valve 10 generates heat when the square secondary battery 100 generates heat due to an abnormality such as overcharging, and is cleaved when the pressure in the battery container 2 rises and reaches a predetermined pressure. The pressure in the battery container is reduced by discharging the water.

  2 and 3 are a plan view and a side view showing an embodiment of the square secondary battery module 200. FIG. In addition, the heat sink 95 is also displayed in FIG. The prismatic secondary battery module 200 has a plurality of prismatic secondary batteries 100 stacked in the thickness direction of the prismatic secondary battery 100 and a cell holder 90 that holds the prismatic secondary batteries 100 in a stacked state. . The cell holder 90 can be made of, for example, a resin material such as glass epoxy resin, polypropylene, or polybutylene terephthalate resin.

  The cell holder 90 is integrally disposed between the battery periphery and between the batteries with the battery lid 6 and the bottom surface 1d of the plurality of square secondary batteries 100 exposed. Most of the wide side surface 1b and the narrow side surface 1c are covered with the cell holder, and the exposed area is small.

  The prismatic secondary battery modules 200 are arranged so that the polarities of the terminals 11 of the adjacent prismatic secondary batteries 100 are reversed, and adjacent bus batteries are connected so that metal bus bars not shown in the figure are connected in series. The terminals are connected. A bus bar may connect between terminals of adjacent batteries so as to be connected in parallel.

  The exposed bottom surfaces 1 d of the plurality of prismatic secondary batteries 100 are substantially aligned on the same plane, and are in direct contact with the heat sink 95 so as to straddle the bottom surfaces 1 d of all the prismatic secondary batteries 100. The heat radiating plate 95 is made of metal and is connected to a housing such as a vehicle so that heat from the battery can be radiated to the housing side.

  Next, an example of the manufacturing method will be described. A member having a concave portion for positioning the cell is provided at the bottom of the container for storing the resin for resin molding. With the release agent applied to the recess, the bottom surface 1d of the square secondary battery is fitted into the recess, and the batteries are arranged. Then, the resin is poured into the resin reservoir to a height that does not reach the battery lid 6. If the resin is cured with a polymerization initiator, it will solidify naturally over time. If it is an ultraviolet curing type, it is solidified by ultraviolet irradiation. Thereafter, the resin and the battery are taken out from the resin reservoir, and the positioning component on the bottom 1d of the square secondary battery 100 is peeled off.

  By the above method, the prismatic secondary battery module 200 in which the bottom surface 1d and the battery lid 6 are exposed and the wide side surface 1b and the narrow side surface 1c are covered with the mold resin is formed. Finally, the rectangular secondary battery module 200 is installed on a heat sink 95 connected to a housing such as a vehicle.

  The effect by taking this structure is demonstrated. As shown in FIG. 3, it is possible to directly contact a heat radiating plate such as a metal to the bottom 1d of the square secondary battery module 200 where the battery lid 6 and the can bottom 1d are exposed. Compared to the case where the bottom 1d is covered with a resin having a low thermal conductivity, the battery container 2 having a higher thermal conductivity is in direct contact with the heat radiating plate. Can efficiently escape to the heat sink. And the temperature rise of a battery and the deterioration of the battery accompanying it can be suppressed.

  In addition, although the example which the bottom part 1d of a battery contacts the heat sink 95 directly was demonstrated, the same effect can be acquired even if the contact of a heat sink and the bottom part 1d is via a heat conductive sheet.

  In the present invention, the square secondary battery 100 is resin-molded to constitute the cell holder 90. Therefore, the battery container 2 can be sufficiently adhered. For example, even if a foreign object is caught, an air layer is not formed around the foreign object, and only a resin layer is formed. Variation in thermal resistance between the two and an increase in thermal resistance can be suppressed.

  Furthermore, since most of the surfaces of the wide side surface 1b and the narrow side surface 1c are covered with the cell holder 90, it can be covered with a resin that can transmit heat more easily than air, so that heat can be easily released.

  The present invention will be briefly described above. In the battery module 200 according to the present invention, a plurality of prismatic secondary batteries 100 having terminals arranged on one surface are stacked such that surfaces having terminals 12 and 14 are arranged on the same surface. Is a resin mold 90 with the surface on which the terminals 12 and 14 are disposed and the bottom surface 1d exposed, and a heat radiating plate 95 is disposed on the bottom surface 1d. With such a configuration, heat can be radiated from the side portions (1b, 1c) of the battery case 2 because heat can be radiated from a resin member having better heat radiability than air. Furthermore, the battery container 2 having a higher thermal conductivity than the case where the bottom 1d is covered with a resin having a lower thermal conductivity is in direct contact with the heat radiating plate 95, so that the heat generated inside the cell due to charging / discharging is stored in the battery. It is possible to efficiently escape to the heat sink via the container 2. And the temperature rise of a battery and the deterioration of the battery accompanying it can be suppressed.

Example 2
Next, Example 2 will be described. Embodiment 2 of the present invention will be described with reference to the drawings. In the second embodiment, only the position of the exposed surface of the cell holder in the first embodiment is changed, and the other points are the same as in the first embodiment. Therefore, the same components are denoted by the same reference numerals and the description thereof is omitted. To do.

  4 and 5 are a plan view and a side view of the prismatic secondary battery module 200 according to the second embodiment. In addition, the heat sink 95 is also displayed in FIG.

  The cell holder 90 is integrally arranged around and between the batteries with one side of the narrow side surface 1c of the plurality of square secondary batteries 100 and the battery lid 6 exposed. The cell holder covers most of the wide side surface 1b, the narrow side surface 1c opposite to the exposed surface, and the bottom 1d, and the exposed area is small.

  The exposed narrow side faces 1c of the plurality of rectangular secondary batteries 100 are substantially aligned on the same plane, and are in direct contact with the heat sink 95 so as to straddle the narrow side faces 1c of all the square secondary batteries 100. The heat radiating plate 95 is made of metal and is connected to a housing such as a vehicle so that heat from the battery can be radiated to the housing side.

  An example of the manufacturing method will be described. A member having a recess for positioning the cell is provided on the side surface of the container for storing the resin for resin molding. A release agent is applied to the recess, and one of the narrow side surfaces 1c is fitted. The resin is poured into the container, and the resin is cured in the same manner as in Example 1. The rectangular secondary battery module is taken out from the container, the positioning member is peeled off, and one side of the narrow side surface 1c of the rectangular secondary battery is exposed. By the above method, the rectangular secondary battery module in which one side of the narrow side surface 1c and the battery cover 6 are exposed, the wide side surface 1b, the opposite side of the exposed surface of the narrow side surface 1c, and the bottom surface 1d are covered with the mold resin. it can.

  The effect by taking this structure is demonstrated. A heat radiating plate such as a metal can be brought into direct contact with the narrow side surface 1c exposed by the square battery module 200. Compared with the case where the narrow side surface 1c is covered with the resin, the battery can having high thermal conductivity comes into contact with the heat sink. Heat generated inside the cell due to charge / discharge can be efficiently released, and acceleration of performance degradation due to an increase in temperature can be suppressed.

Example 3
Next, Embodiment 3 of the present invention will be described with reference to the drawings.
In Example 3, only the position of the exposed surface of the cell holder in Example 1 is changed, and the other points are the same as in Example 1. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted. To do.

  6 and 7 are a plan view and a side view of the prismatic secondary battery module 200 according to the third embodiment. In addition, the heat sink 95 is also displayed in FIG.

  Among the plurality of prismatic secondary batteries 100 constituting the prismatic secondary battery module 200, the cell holder 90 exposes the wide side surface 1b outside the prismatic secondary battery 100 at both ends and the battery lid 6 in an exposed state, and between the battery periphery and between the batteries. Are integrally arranged. Note that the cell holder almost covers the narrow side surface 1c, the bottom surface 1d, and the wide side surface 1b opposite to the exposed surface, and the exposed area is small.

  The exposed wide side surface 1 b of the prismatic secondary battery 100 is in direct contact with the heat sink 95. The heat radiating plate 95 is made of metal and is connected to a housing such as a vehicle so that heat from the battery can be radiated to the housing side.

  An example of the manufacturing method will be described. A member having a recess for positioning the cell is provided on the side surface of the container for storing the resin for resin molding. A release agent is applied to the concave portion, and the wide side surface 1b outside the rectangular secondary battery 100 at both ends is fitted. The resin is poured into the container, and the resin is cured in the same manner as in Example 1. The rectangular secondary battery module is taken out of the container, the positioning member is peeled off, and the wide side surface 1b is exposed. By the above method, a rectangular secondary battery module in which the wide side surface 1b and the battery lid 6 are exposed and the narrow side surface 1c and the bottom surface 1d are covered with resin can be obtained.

  The effect by taking this structure is demonstrated. A heat radiating plate such as metal can be brought into direct contact with the wide side surface 1b exposed by the square battery module 200. Compared to the case where the wide side surface is covered with the resin, the battery can having a high thermal conductivity comes into contact with the heat sink. Heat generated inside the cell due to charge / discharge can be efficiently released, and acceleration of deterioration due to an increase in temperature can be suppressed.

Example 4
Next, a fourth embodiment of the present invention will be described with reference to the drawings.
Example 4 is the same as Example 1 except that the position of the exposed surface of the cell holder of Example 1 is changed, and the same components are denoted by the same reference numerals and description thereof is omitted. To do.

  8 and 9 are a plan view and a side view of the prismatic secondary battery module 200 according to the fourth embodiment. In addition, the heat sink 95 is also displayed in FIG.

  The cell holder 90 is integrally disposed around the battery and between the batteries with the both sides of the narrow side surface 1c of the plurality of square secondary batteries 100 and the battery lid 6 exposed. Note that the cell holder covers most of the wide side surface 1b and the bottom 1d, and the exposed area is small.

  The rectangular secondary battery module 200 has two narrow side faces 1c exposed, but the narrow side faces 1c exposed on each side are substantially aligned on the same plane, and the width of all the square secondary batteries 100 is the same. The heat sink 95 is directly in contact with the narrow side surface 1c. The heat radiating plate 95 is made of metal and is connected to a housing such as a vehicle so that heat from the battery can be radiated to the housing side.

  An example of the manufacturing method will be described. A pair of members having recesses for positioning the cells is prepared, and a release agent is applied to each recess. A member having a recess is fitted into one of the narrow side surfaces 1c of the prismatic secondary battery 100, and a member having another recess is fitted into the other narrow side surface 1c. After fitting into each square secondary battery 100 in the same manner, it is inserted into a container for storing resin for resin molding. The resin is poured into the container, and the resin is cured in the same manner as in Example 1. The prismatic secondary battery module is taken out of the container, the positioning member is peeled off, and both sides of the narrow side surface 1c of the prismatic secondary battery are exposed. By the above method, a rectangular secondary battery module in which both sides of the narrow side surface 1c and the battery lid 6 are exposed and the wide side surface 1b and the bottom surface 1d are covered with resin can be obtained.

  The effect by taking this structure is demonstrated. A heat radiating plate such as a metal can be brought into direct contact with both sides of the narrow side surface 1c exposed by the prismatic secondary battery module 200. In the second embodiment, the heat dissipation plate is brought into contact with one side of the narrow side surface 1c. However, in this embodiment, the heat dissipation efficiency can be further increased by contacting both sides of the narrow side surface 1c.

Example 5
Next, a fifth embodiment of the present invention will be described with reference to the drawings.
Example 5 is only a change from Example 1 that the cell holder is made of two kinds of materials. Since the other points are the same as those of the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

FIG. 10 is a plan view of the prismatic secondary battery module 200 according to the fifth embodiment.
The cell holder 90 is disposed around and between the batteries with the bottom surfaces 1d and the battery lids 6 of the plurality of rectangular secondary batteries 100 exposed. The cell holder 90 is composed of two components, a low heat conduction holder 91 and a high heat conduction holder 92, and the low heat conduction holder 91 is disposed on the outer peripheral side of the rectangular secondary battery module 200, and the high heat conduction holder 92 is interposed between each square secondary battery 100. Has been placed. The thermal conductivity of the high thermal conductivity holder is greater than the thermal conductivity of the low thermal conductivity holder.

  An example of the manufacturing method will be described. A member having a recess for positioning the cell is provided on the bottom surface of the container for storing the resin for resin molding, and a release agent is applied to the recess. The prismatic secondary battery 100 is fitted into the recess in a state where the molded high heat conduction holder 92 is sandwiched between the prismatic secondary batteries 100. When the resin is poured into the container and the resin is cured in the same manner as in the first embodiment, the low thermal conductive holder 91 is formed. The prismatic secondary battery module is taken out from the container, the positioning member is peeled off, and the bottom surface 1d of the prismatic secondary battery is exposed. By the above method, a square secondary battery module in which the bottom surface 1d and the battery lid 6 are exposed and the wide side surface 1b and the narrow side surface 1c are covered with two kinds of resins can be obtained.

  The effect by taking this structure is demonstrated. Since the heat conductivity of the high heat conductive holder 92 sandwiched between the square secondary batteries 100 is larger than that of the low heat conductive holder, the heat generated inside the battery during charge / discharge can be conducted along the high heat conductive holder. The temperature of the square secondary battery near the center can be reduced.

  The structure in which the cell holder 90 is made of two types of resins can be applied to either the structure in which the narrow side surface 1c of Example 2 or Example 4 is exposed or the structure in which the wide side surface 1b of Example 3 is exposed. .

Example 6
Next, Embodiment 6 of the present invention will be described with reference to the drawings.
In Example 6, only the position of the exposed surface of the cell holder in Example 1 is changed, and the other points are the same as in Example 1. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted. To do.

FIG. 11 is a plan view and a side view of the prismatic secondary battery module 200 according to the sixth embodiment.
The cell holder 90 is integrally disposed around the battery and between the batteries with the bottom surface 1d of the plurality of square secondary batteries 100, the terminal 11, the insulator 22, and the gas discharge valve 10 on the battery cover 6 exposed. The cell holder covers most of the wide side surface 1b, the narrow side surface 1c opposite to the exposed surface, and the bottom 1d, and the exposed area is small.

  An example of the manufacturing method will be described. A member having a recess for positioning the cell is provided on the side surface of the container for storing the resin for resin molding. A release agent is applied to the recess, one of the narrow side surfaces 1c is fitted, and the batteries are arranged. A block coated with a release agent is disposed on the gas discharge valve 10. Then, the mold resin is poured into a container for storing the resin up to the height of the upper surface of the insulator 22, and the resin is cured as in the first embodiment. The prismatic secondary battery module is taken out of the container, the positioning member and the block disposed on the gas discharge valve 10 are peeled off, and the bottom surface 1d of the prismatic secondary battery 100, the gas discharge valve 10 and the terminal 11 are exposed. By the above method, a rectangular secondary battery module in which the bottom surface 1d, the gas discharge valve 10, and the terminal 11 are exposed and the wide side surface 1b and the narrow side surface 1c are covered with resin can be obtained.

  The effect by taking this structure is demonstrated. It becomes possible to directly contact a heat radiating plate made of metal or the like with the exposed bottom surface 1d. Compared to the case where the bottom surface 1d is covered with resin, a battery can having a high thermal conductivity comes into contact with the heat sink. Heat generated inside the cell due to charge / discharge can be efficiently released, and acceleration of performance degradation due to an increase in temperature can be suppressed.

  In addition, since the cell holder 90 is formed on a part of the upper surface of the battery lid 6, the area covering the square secondary battery 100 is increased, and the square secondary battery 100 can be more firmly fixed.

  The structure in which the cell holder 90 is also formed on the upper part of the battery lid 6 is a structure in which the narrow side surface 1c in the second and fourth embodiments is exposed, or a structure in which the wide side surface 1b in the third embodiment is exposed. The cell holder of Example 5 can also be applied to a structure made of two types of resins.

  In addition, although this proposal was applied with respect to the square secondary battery in Example 1- Example 6, it is applicable also to a cylindrical battery.

The present invention will be briefly described above.
In the battery module according to the present invention, a plurality of rectangular secondary batteries having terminals arranged on one surface are stacked so that the surfaces having the terminals are aligned, and the terminals and terminals are arranged between the rectangular secondary batteries. The resin molding is performed with at least one surface other than the exposed surface exposed. By adopting such a structure, heat can be radiated from the side surface portions (1b, 1c) of the battery case 2 because heat can be radiated from a resin member having better heat radiability than air. Furthermore, when the exposed surface, for example, the bottom 1d is covered with a resin having a low thermal conductivity, the battery container 2 having a higher thermal conductivity is directly brought into contact with the heat radiating plate 95, thereby generating inside the cell by charge / discharge. The released heat can be efficiently released to the heat radiating plate through the battery container 2.

  The battery module according to the present invention includes a square secondary battery having a bottom surface facing a surface provided with a terminal, and a side surface connecting the surface provided with the terminal and the bottom surface. It consists of a wide surface and a pair of narrow surfaces, and at least one of the narrow surfaces of the prismatic secondary battery is exposed from the resin. By adopting such a structure, it becomes possible to directly contact a heat radiating plate made of metal or the like with the narrow side surface 1 c exposed by the square battery module 200. Compared with the case where the narrow side surface 1c is covered with the resin, the battery can having high thermal conductivity comes into contact with the heat sink. Heat generated inside the cell due to charge / discharge can be efficiently released, and acceleration of performance degradation due to an increase in temperature can be suppressed.

  In the battery module according to the present invention, the pair of narrow surfaces are exposed from the resin. A heat radiating plate such as a metal can be brought into direct contact with both sides of the narrow side surface 1c exposed by the prismatic secondary battery module 200. That is, the heat dissipation efficiency can be further increased by bringing the heat dissipation plate into contact with both sides of the narrow side surface 1c as in this structure, rather than bringing the heat dissipation plate into contact with one side of the narrow side surface 1c.

  In the battery module of the present invention, the prismatic secondary battery has a bottom surface facing the surface provided with the terminal, and a side surface connecting the surface provided with the terminal and the bottom surface. A wide surface disposed on both ends of the battery module, and the wide surface disposed outside the battery module is exposed from the resin. A heat radiating plate such as metal can be brought into direct contact with the wide side surface 1b exposed by the square battery module 200. Compared to the case where the wide side surface is covered with the resin, the battery can having a high thermal conductivity comes into contact with the heat sink. Heat generated inside the cell due to charge / discharge can be efficiently released, and acceleration of deterioration due to an increase in temperature can be suppressed.

  In the battery module of the present invention, the resin disposed between the square secondary batteries and the resin disposed on the outer periphery of the battery module are different resins, and the resin disposed between the square secondary batteries is more A battery module characterized by high thermal conductivity. Since the heat conductivity of the high heat conductive holder 92 sandwiched between the square secondary batteries 100 is larger than that of the low heat conductive holder, the heat generated inside the battery during charge / discharge can be conducted along the high heat conductive holder. The temperature of the square secondary battery near the center can be reduced.

  Further, in the battery module according to the present invention, a gas discharge valve is further arranged on the surface where the terminal of the rectangular secondary battery is arranged, and the terminal and the gas discharge valve are exposed on the surface where the terminal is arranged. So that it is covered with resin. By adopting such a structure, the heat dissipation as a battery module is improved, but the safety valve is not blocked with a resin material, so that heat dissipation can be ensured while ensuring safety.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 Battery can 1b Wide side surface 1c Narrow side surface 1d Bottom surface 2 Battery container 6 Battery cover 10 Gas exhaust valve 11 Terminal 12 Positive electrode terminal 14 Negative electrode terminal 22 Insulator 24 Insulator 90 Cell holder 91 Low heat conductive holder 92 High heat conductive holder 95 Heat sink 100 Square secondary battery 200 Square secondary battery module

Claims (7)

In a battery module in which a plurality of prismatic secondary batteries with terminals arranged on one surface are stacked so that the surfaces having the terminals are aligned,
The square secondary batteries are resin-molded with the terminals and at least one surface other than the surface on which the terminals are disposed exposed. The battery module according to claim 1,
The prismatic secondary battery has a bottom surface facing the surface provided with the terminal, and a side surface connecting the surface provided with the terminal and the bottom surface,
A battery module, wherein a bottom surface of the rectangular secondary battery is exposed from the resin. The battery module according to claim 1,
The prismatic secondary battery has a bottom surface facing the surface provided with the terminal, and a side surface connecting the surface provided with the terminal and the bottom surface,
The side surface comprises a pair of wide surfaces and a pair of narrow surfaces,
The battery module, wherein at least one of the narrow surfaces of the rectangular secondary battery is exposed from the resin. The battery module according to claim 3, wherein
The battery module, wherein the pair of narrow surfaces are exposed from the resin. The battery module according to claim 1,
The prismatic secondary battery has a bottom surface facing the surface provided with the terminal, and a side surface connecting the surface provided with the terminal and the bottom surface,
The side surface comprises a pair of wide surfaces and a pair of narrow surfaces,
A battery module, characterized in that wide surfaces arranged at both ends of the battery module, the wide surfaces arranged outside the battery module, are exposed from the resin. The battery module according to any one of claims 1 to 5,
The resin disposed between the prismatic secondary batteries and the resin disposed on the outer periphery of the battery module are different resins, and the resin disposed between the prismatic secondary batteries has higher thermal conductivity. Battery module. The battery module according to any one of claims 1 to 6,
A gas exhaust valve is further disposed on the surface of the prismatic secondary battery on which the terminal is disposed, and the surface on which the terminal is disposed is covered with a resin so that the terminal and the gas exhaust valve are exposed. A battery module characterized by.

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