JP6386774B2 - Battery module - Google Patents

Description

  Embodiments described herein relate generally to an assembled battery module.

  Conventionally, there is an assembled battery module in which a plurality of secondary batteries are accommodated in an electrically insulating resin casing. In such an assembled battery module, it may be difficult to improve heat dissipation and cooling, and it may be difficult to increase the charge / discharge current values of the plurality of secondary batteries.

JP 2012-33306 A JP 2013-134809 A

  Problem to be solved by the invention is providing the assembled battery module which can improve heat dissipation and cooling property and can improve the capability of charging / discharging.

The assembled battery module according to the embodiment includes a plurality of secondary batteries, an aluminum die-cast housing, a non-conductive lid, a non-conductive covering member, and a non-conductive and thermally conductive filler. , with a. The housing accommodates a plurality of secondary batteries. The lid covers the opening of the housing where the electrode terminal portions of the plurality of secondary batteries housed in the housing are exposed to the outside. The covering member covers at least a part of the surface of each of the plurality of secondary batteries, and is provided with at least one through hole. In the filler, the through hole filled in the through hole has a slit shape extending in the insertion direction of the plurality of secondary batteries into the inside of the housing.

The perspective view which shows the structure of the assembled battery module of embodiment. The disassembled perspective view which shows the structure of the assembled battery module of embodiment. The perspective view which shows the secondary battery and coating | coated member of the assembled battery module of embodiment. The disassembled perspective view which shows each of the secondary battery and coating | coated member of the assembled battery module of embodiment. The perspective view which shows the housing | casing of the assembled battery module of embodiment. The perspective view which shows the refrigerant | coolant in / out member of the assembled battery module of embodiment. The perspective view which shows the housing | casing of the assembled battery module of the 1st modification of embodiment. The perspective view which shows the housing | casing of the assembled battery module of the 2nd modification of embodiment. The perspective view which shows the structure of the assembled battery module of the 3rd modification of embodiment. The disassembled perspective view which shows the structure of the assembled battery module of the 3rd modification of embodiment. The perspective view which shows the 2nd refrigerant | coolant in / out member of the assembled battery module of the 3rd modification of embodiment.

  Hereinafter, an assembled battery module according to an embodiment will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the assembled battery module 10 according to the embodiment includes a plurality of secondary batteries 11, an aluminum die-cast housing 12, a non-conductive lid 13, and a plurality of bus bars 14. The electronic circuit board 15 and the top cover 16 are provided. Further, the assembled battery module 10 includes a refrigerant inlet / outlet member 17 connected to the housing 12 and a sealing material 18.

  Each of the secondary batteries 11 is a nonaqueous electrolyte secondary battery such as a lithium ion battery, for example. As shown in FIGS. 2 and 3, each secondary battery 11 includes a flat, substantially rectangular parallelepiped outer container 21 formed of aluminum or an aluminum alloy, and an electrode housed in the outer container 21 together with a nonaqueous electrolyte. A body (not shown). Each secondary battery 11 has a positive electrode terminal 22 connected to the positive electrode of the electrode body and a negative electrode terminal 23 connected to the negative electrode of the terminal surface 25 via a gasket 24 made of an insulator such as synthetic resin or glass. It is provided at each of both ends in the longitudinal direction.

As shown in FIGS. 3 and 4, each of the plurality of secondary batteries 11 is non-conductive covering at least a part of the surface of the outer container 21, for example, the bottom surface 26 and the side surface 27 accommodated in the housing 12. A covering member 28 is provided. The covering member 28 has, for example, a case shape made of a sheet-like resin material having elasticity and thermal conductivity in addition to non-conductivity. The covering member 28 has, for example, a predetermined minimum thickness required to electrically insulate between the housing 12 and each secondary battery 11.
The covering member 28 is provided with a plurality of through holes 28a arranged in a mesh shape. Each of the plurality of through holes 28a is formed in a slit shape extending in the height direction of each secondary battery 11 (that is, the direction from the bottom surface 26 toward the terminal surface 25). The direction in which each through-hole 28a extends is set so as to coincide with the direction in which each secondary battery 11 is inserted into, for example, a housing 12 described later.

  Each of the plurality of secondary batteries 11 has heat filled between the outer casing 21 and the covering member 28 and in the plurality of through holes 28a in a state where the covering member 28 is attached to at least a part of the surface of the outer casing 21. A conductive filler 29 is provided. The filler 29 is made of, for example, any material of a gel having a viscosity capable of flowing, an adhesive, and a paste. For example, the filling material 29 is pressurized by inserting each secondary battery 11 into the housing 12 in a state where a predetermined amount is stored in the housing 12 in advance, and the outer container 21 and the covering member 28. During this time, the plurality of through holes 28a and the covering member 28 and the inner surface of the housing 12 flow without gaps. Thus, the filler 29 can be formed without forming an air layer such as bubbles between the outer container 21 and the covering member 28, between the plurality of through holes 28 a, and between the covering member 28 and the inner surface of the housing 12. Filled.

  The plurality of secondary batteries 11 are, for example, the long side surfaces 27a of adjacent secondary batteries 11 (that is, the length of the pair of wide long side surfaces 27a and narrow short side surfaces 27b forming the side surfaces 27). The side surfaces 27a) are accommodated in the housing 12 in a stacked state so as to face each other. The housing 12 is formed by die casting using aluminum or an aluminum alloy.

As shown in FIG. 5, the housing 12 has at least one or more partitions that partition between the adjacent secondary batteries 11 so as to partition each of the plurality of accommodating portions 31 in which the plurality of secondary batteries 11 are accommodated. A partition 32 is provided. The partition part 32 has a plate-like shape that connects between a pair of opposed first wall parts 33 a that form a part of the housing 12.
The housing 12 includes a partition 32 and a coolant channel 34 that passes through the inside of the first wall 33 a connected to the partition 32 and circulates a coolant such as cooling water. For example, the refrigerant flow path 34 is formed by a flow path that penetrates the interior of the partition part 32 and the first wall part 33a in the longitudinal direction of the secondary battery 11 housed in each housing part 31. The first wall portion 33a connected to the partition portion 32 covers the opening 34a of the refrigerant flow path 34 that opens at the surface of the first wall portion 33a, and the refrigerant inlet / outlet member 17 described later applies the sealing material 18 to the first wall portion 33a. Is mounted through.

  The housing 12 includes an opening 35 that exposes the terminal surface 25 of the secondary battery 11 accommodated in each of the plurality of accommodating portions 31 to the outside. The lid 13 fixes the secondary battery 11 accommodated in each of the plurality of accommodating portions 31 and is detachably attached to the housing 12 so as to cover the opening 35. The housing 12 and the lid body 13 include a plurality of claw portions 36a and a plurality of mounting holes 36b that are detachably mounted. As a result, the lid 13 is fixed to the housing 12 by mounting the claw portions 36a in the mounting holes 36b, thereby closing the openings 35 of the housing 12 and fixing the plurality of secondary batteries 11. The lid 13 is released from the housing 12 by releasing the attachment of the claw portions 36a to the attachment holes 36b, thereby opening the opening 35 and opening the terminal surfaces 25 of the secondary batteries 11. Expose to the outside.

The lid body 13 includes a plurality of terminal holes 13 a that expose the positive terminals 22 and the negative terminals 23 of the plurality of secondary batteries 11 to the outside while being fixed to the housing 12. The plurality of bus bars 14 are disposed between the lid body 13 and the electronic circuit board 15 so as to electrically connect the positive terminal 22 and the negative terminal 23 exposed from the plurality of terminal holes 13 a and the electronic circuit board 15. Has been. Each bus bar 14 is formed by bending a metal such as conductive aluminum, and has a predetermined shape corresponding to various connection modes to the plurality of secondary batteries 11. For example, each bus bar 14 shown in FIG. 2 has a substantially I-shaped plate shape that electrically connects the positive terminal 22 and the negative terminal 23 of the secondary batteries 11 adjacent in the short direction. The plurality of bus bars 14 are fixed to the electronic circuit board 15 or an external output terminal (not shown) by, for example, screwing.
The top cover 16 is attached to the lid body 13 to protect the plurality of bus bars 14 and the electronic circuit board 15.

  As shown in FIG. 6, the refrigerant inlet / outlet member 17 is formed in a plate shape that is attached to the first wall 33 a of the housing 12. The refrigerant inlet / outlet member 17 includes a groove portion 42 facing the plurality of openings 34 a of the first wall portion 33 a on the facing surface 41 that faces and contacts the surface of the first wall portion 33 a of the housing 12. The groove 42 is connected to a refrigerant inlet / outlet 44 that penetrates the refrigerant inlet / outlet member 17 in the thickness direction and opens at a surface 43 opposite to the facing surface 41. The groove portion 42 is blocked by the surface of the first wall portion 33a in a state in which the refrigerant inlet / outlet member 17 is mounted on the first wall portion 33a of the housing 12, so that the plurality of openings 34a and the refrigerant inlet / outlet 44 are separated. A refrigerant inlet / outlet flow path 45 that branches and merges so as to be connected is formed. Thereby, the refrigerant inlet / outlet 44 allows the refrigerant to flow into and out of the plurality of refrigerant flow paths 34. The groove 42 has a shape such that the pressure loss and flow rate of the refrigerant flowing through each of the refrigerant flow path 34 and the refrigerant inlet / outlet flow path 45 of the housing 12 are equal.

The refrigerant inlet / outlet member 17 is provided on the opposing surface 41 so as to surround the peripheral edge of the groove portion 42, and includes a seal groove 46 in which the seal material 18 is mounted. The seal material 18 is formed in an annular shape made of, for example, a resin material having thermal conductivity in addition to non-conductivity. The seal material 18 has a shape corresponding to the seal groove 46, and is inserted between the first wall portion 33 a of the housing 12 and the refrigerant input / output member 17 in a state of being attached to the seal groove 46. The path 45 is sealed.
The refrigerant inlet / outlet member 17 includes a connecting portion 47 for connecting a pipe or a hose to the refrigerant inlet / outlet 44 on the surface 43 side.

As shown in FIG. 2, the housing 12 is connected to a pair of first wall portions 33 a, and protrudes outward from the surface of the other pair of opposing second wall portions 33 b. 51 is provided. The refrigerant inlet / outlet member 17 is fixed to the flange portion 51 by, for example, fastening with bolts or a clamp member (not shown).
For example, the housing 12 shown in FIG. 2 includes a flange portion 51 provided with a plurality of bolt mounting holes 51a. For example, a plurality of bolt insertion holes 17a facing the plurality of bolt mounting holes 51a of the flange portion 51 are formed in the refrigerant inlet / outlet member 17 shown in FIG. Thus, the casing 12 and the refrigerant inlet / outlet member 17 are fixed by mounting the bolts 52 inserted into the bolt insertion holes 17a into the bolt mounting holes 51a.

According to the embodiment described above, heat dissipation and cooling of the assembled battery module 10 can be prevented while having an aluminum die-cast housing 12 that accommodates a plurality of secondary batteries 11 while preventing an increase in cost required for the configuration. The charging / discharging ability can be improved.
Furthermore, each secondary battery 11 has a non-conductive covering member 28 that covers at least a part of the surface of the outer container 21, so that desired electrical insulation is provided between each secondary battery 11 and the housing 12. Sex can be secured. Furthermore, by having the coating member 28 having thermal conductivity, the heat dissipation and cooling performance of each secondary battery 11 can be improved. Furthermore, by having the case-shaped covering member 28 having elasticity, the dimensional tolerance of each secondary battery 11 can be appropriately absorbed when the covering member 28 is attached to each secondary battery 11.
Furthermore, each secondary battery 11 is placed in the housing 12 by having a covering member 28 provided with a plurality of slit-shaped through holes 28 a extending in the direction in which each secondary battery 11 is inserted in the housing 12. When inserted, the filler 29 can be easily filled into the through hole 28a without a gap.

Furthermore, by having a non-conductive and thermally conductive filler 29 filled between the outer container 21 and the covering member 28, a plurality of through holes 28a, and between the covering member 28 and the housing 12, Heat dissipation and cooling properties can be improved while ensuring desired electrical insulation.
Furthermore, by having a filler 29 that is one of gel, adhesive, and paste, between the outer container 21 and the covering member 28, between the plurality of through holes 28a, and between the covering member 28 and the housing 12. In addition, the filler 29 can be filled without a gap.

Furthermore, by having the partition part 32 which is provided with the refrigerant | coolant flow path 34 and partitions off between the adjacent secondary batteries 11, the heat dissipation of each secondary battery 11 and cooling property can be improved.
Furthermore, by having the refrigerant inlet / outlet member 17 that forms the refrigerant inlet / outlet passage 45 that connects the plurality of refrigerant passages 34 and the refrigerant inlet / outlet 44 by being attached to the first wall portion 33 a of the housing 12, Therefore, it is possible to prevent the configuration of circulating the refrigerant from becoming complicated.

Hereinafter, a first modification will be described.
In the assembled battery module 10 of the first modified example, the housing 12 may include a plurality of refrigerant channels 34 in each partition 32 as shown in FIG. Further, the housing 12 may include at least one or more refrigerant channels 34 penetrating the inside of the pair of second wall portions 33b and the bottom portion 33c of the housing 12 in addition to the partition portions 32.
According to the first modified example, in addition to the partition portions 32, the pair of second wall portions 33b and the bottom portion 33c of the housing 12 have the refrigerant flow paths 34, so that the heat dissipation of the assembled battery module 10 and Coolability can be further improved.

Hereinafter, a second modification will be described.
In the assembled battery module 10 of the second modified example, the housing 12 includes a plurality of heat radiation fins 61 on the surface of the pair of opposing second wall portions 33b as shown in FIG. Each of the plurality of radiating fins 61 has a shape that extends in parallel with the insertion direction of the plurality of secondary batteries 11 into the housing 12, for example.
According to the second modification, the heat dissipation and cooling performance of the assembled battery module 10 can be further improved by having the plurality of heat radiation fins 61 on the second wall portion 33b of the housing 12. .
Furthermore, by having a plurality of heat radiating fins 61 having a shape extending in parallel with the insertion direction of each secondary battery 11 into the housing 12, the mold can be pulled out when the housing 12 is manufactured by aluminum die casting. One direction can be used, and the manufacturing process can be simplified.

Hereinafter, a third modification will be described.
As shown in FIGS. 9 and 10, the assembled battery module 10 of the third modification includes a plurality of housings 12 that are coupled so as to connect the refrigerant flow paths 34 to each other. The adjacent casings 12 face each other with the first wall portion 33a facing each other, and face the opening 34a of the first wall portion 33a with each other, and the second refrigerant inlet / outlet member 71 and the plurality of second seals. They are connected via a material 72.
As shown in FIGS. 10 and 11, the second refrigerant inlet / outlet member 71 is formed in a plate shape that is mounted so as to be sandwiched between the first wall portions 33 a of the adjacent casings 12. The second refrigerant inlet / outlet member 71 is made of, for example, a resin material having thermal conductivity in addition to non-conductivity. The second refrigerant inlet / outlet member 71 faces a plurality of openings 34a of each first wall portion 33a on a pair of opposing surfaces 71a that face and contact the surface of the first wall portion 33a of each housing 12. A plurality of through holes 73 are formed.

The second refrigerant inlet / outlet member 71 is provided on the opposing surface 71 a so as to surround the periphery of each through hole 73, and includes a second seal groove 74 in which the second seal material 72 is mounted. Each second sealing material 72 is formed in an annular shape made of, for example, a resin material having thermal conductivity in addition to non-conductivity. The second sealing material 72 has a shape corresponding to the second sealing groove 74, and is attached to the second sealing groove 74 and the first wall portion 33 a of the housing 12 and the second refrigerant inlet / outlet member. The through hole 73 is sealed by being sandwiched between 71 and 71.
The adjacent casings 12 have the flange portions 51 and the second refrigerant inlet / outlet member 71 fixed to each other by, for example, fastening with bolts or clamping members (not shown).
For example, each of the adjacent housings 12 shown in FIG. 10 includes a flange portion 51 provided with a plurality of bolt mounting holes 51a. The second refrigerant inlet / outlet member 71 is formed with a plurality of bolt insertion holes 71 b that face the plurality of bolt mounting holes 51 a of the flange portion 51. Thus, the adjacent casing 12 and the second refrigerant inlet / outlet member 71 are fixed by attaching the bolts 52 to the bolt mounting holes 51a and the bolt insertion holes 71b.

According to the third modification, by having a plurality of casings 12 connected so as to connect the refrigerant flow paths 34 to each other, when the number of connections of the casings 12 is expanded, It is not necessary to provide piping or the like, and it is possible to prevent the configuration for circulating the refrigerant from becoming complicated.
Furthermore, by having the non-conductive second refrigerant inlet / outlet member 71 connecting the refrigerant flow paths 34 between the adjacent housings 12, while preventing the configuration of circulating the refrigerant from becoming complicated, Adjacent housings 12 can be electrically insulated.
Furthermore, by having the 2nd refrigerant | coolant in / out member 71 which has heat conductivity in addition to nonelectroconductivity, the heat dissipation and cooling property of the assembled battery module 10 can be improved further.

Hereinafter, a fourth modification will be described.
In the embodiment described above, the covering member 28 is formed in a case mold made of a sheet-like resin material, but the present invention is not limited to this.
The covering member 28 may be, for example, a case-type member whose inner surface is covered with an organic material by vapor deposition or the like.

Hereinafter, a fifth modification will be described.
In the third modified example described above, the adjacent casings 12 are fixed to the flange portions 51 of the casings 12 by bolts or clamp members, but the present invention is not limited to this.
For example, the plurality of casings 12 connected to each other may be fixed by a pair of plate-like members sandwiched from both sides in the connecting direction.

Hereinafter, a sixth modification will be described.
In the third modified example described above, the adjacent casings 12 are electrically insulated by the non-conductive second refrigerant inlet / outlet member 71, and the non-conductive lid 13 is attached to each casing 12. However, it is not limited to this. For example, the plurality of lids 13 may be integrally formed.
In the above-described third modification, the casing 12 and the refrigerant inlet / outlet member 17 and the casing 12 and the second refrigerant inlet / outlet member 71 are individually fixed by the respective bolts 52. It is not limited to. The casing 12, the refrigerant inlet / outlet member 17, and the second refrigerant inlet / outlet member 71 have a common bolt (not shown) extending in the connecting direction of the plurality of casings 12, a bolt mounting hole 51 a, and each bolt insertion hole 17 a, It may be fixed by being attached to 71b.

According to at least one embodiment described above, the housing 12 made of aluminum die-casting that accommodates the plurality of secondary batteries 11 prevents the increase in cost required for the configuration, and the heat dissipation of the assembled battery module 10. Performance and cooling performance can be improved, and charge / discharge performance can be improved.
Furthermore, each secondary battery 11 has a non-conductive covering member 28 that covers at least a part of the surface of the outer container 21, so that desired electrical insulation is provided between each secondary battery 11 and the housing 12. Sex can be secured. Furthermore, by having the coating member 28 having thermal conductivity, the heat dissipation and cooling performance of each secondary battery 11 can be improved. Furthermore, by having the case-shaped covering member 28 having elasticity, the dimensional tolerance of each secondary battery 11 can be appropriately absorbed when the covering member 28 is attached to each secondary battery 11.
Furthermore, each secondary battery 11 is placed in the housing 12 by having a covering member 28 provided with a plurality of slit-shaped through holes 28 a extending in the direction in which each secondary battery 11 is inserted in the housing 12. When inserted, the filler 29 can be easily filled into the through hole 28a without a gap.

Furthermore, by having a non-conductive and thermally conductive filler 29 filled between the outer container 21 and the covering member 28, a plurality of through holes 28a, and between the covering member 28 and the housing 12, Heat dissipation and cooling properties can be improved while ensuring desired electrical insulation.
Furthermore, by having a filler 29 that is one of gel, adhesive, and paste, between the outer container 21 and the covering member 28, between the plurality of through holes 28a, and between the covering member 28 and the housing 12. In addition, the filler 29 can be filled without a gap.

Furthermore, by having the partition part 32 which is provided with the refrigerant | coolant flow path 34 and partitions off between the adjacent secondary batteries 11, the heat dissipation of each secondary battery 11 and cooling property can be improved.
Furthermore, by having the refrigerant inlet / outlet member 17 that forms the refrigerant inlet / outlet passage 45 that connects the plurality of refrigerant passages 34 and the refrigerant inlet / outlet 44 by being attached to the first wall portion 33 a of the housing 12, Therefore, it is possible to prevent the configuration of circulating the refrigerant from becoming complicated.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Assembly battery module, 11 ... Secondary battery, 12 ... Case, 13 ... Cover body, 17 ... Refrigerant in / out member, 18 ... Sealing material, 22 ... Positive electrode terminal, 23 ... Negative electrode terminal, 25 ... Terminal surface, 26 ... Bottom surface, 27 ... side surface, 28 ... cover member, 28a ... through hole, 29 ... filler, 31 ... accommodating portion, 32 ... partitioning portion, 33a ... first wall portion, 33b ... second wall portion, 34 ... refrigerant flow path 34a ... opening, 35 ... opening, 44 ... refrigerant inlet / outlet, 45 ... refrigerant inlet / outlet channel, 51 ... flange, 61 ... heat radiation fin, 71 ... second refrigerant inlet / outlet member, 72 ... second sealing material

Claims (8)

A plurality of secondary batteries;
A housing made of aluminum die-casting that houses the plurality of secondary batteries;
A non-conductive lid that covers an opening of the casing where each electrode terminal portion of the plurality of secondary batteries housed in the casing is exposed to the outside;
A non-conductive covering member that covers at least a part of the surface of each of the plurality of secondary batteries and is provided with at least one or more through holes;
A non-conductive and thermally conductive filler filled in the through hole ,
The through hole has a slit shape extending in an insertion direction of the plurality of secondary batteries into the housing.
Battery module. The assembled battery module according to claim 1 , wherein the covering member is made of a resin or a heat conductive material. The assembled battery module according to claim 1 , wherein the filler is any one of a gel, an adhesive, and a paste. A plurality of secondary batteries;
A housing made of aluminum die-casting that houses the plurality of secondary batteries;
A non-conductive lid that covers an opening of the housing where the electrode terminal portions of the plurality of secondary batteries housed in the housing are exposed to the outside, and
The housing includes a partition that partitions between adjacent secondary batteries of the plurality of secondary batteries,
The partition includes a refrigerant flow path,
The housing includes a wall portion provided with a flow path connected to the flow path of the partition,
A refrigerant inlet / outlet member that is attached to the wall portion via a sealing material so that the flow path of the wall portion covers an opening portion that opens at the surface of the wall portion, and that causes the refrigerant to flow into and out of the opening portion. With
The refrigerant inlet / outlet member includes a refrigerant inlet / outlet channel that branches and merges facing the plurality of openings, and an inlet / outlet portion connected to the refrigerant inlet / outlet channel,
The adjacent housings of the plurality of housings are connected in a state where the opening portions of the wall portions face each other via the second refrigerant inlet / outlet member and the second sealing material.
Battery module. The housing includes a flange portion protruding from the surface of the wall portion,
The refrigerant inlet / outlet member is fixed to the flange portion,
The assembled battery module according to claim 4 . The assembled battery module according to claim 4 , wherein the second refrigerant inlet / outlet member is made of a non-conductive material. The assembled battery module according to claim 1, wherein the casing includes a heat radiation fin at least at a part on a surface thereof . The radiating fin has a shape extending in parallel with the insertion direction of the plurality of secondary batteries into the housing.
The assembled battery module according to claim 7.

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