STORAGE BATTERY MODULE

Abstract

Storage battery module (1) comprising: Battery cells (51); a first plate-shaped member (10, 80) with first connecting conductors (12) formed therein, wherein the first connecting conductors (12) (i) are conductors that electrically connect the terminals (52) of the battery cells (51) that are adjacent to each other, and (ii) are separated from each other by an insulator (11); and a second plate-shaped member (20) with a heat dissipation area formed by a member having a thermal conductivity greater than or equal to a second threshold value, wherein the heat dissipation area is opposite at least a part of the first connecting conductors (12) of the first plate-shaped member (10, 80) via an insulating member (30) having a thickness less than or equal to a first threshold value in a direction perpendicular to a principal surface of the first plate-shaped member (10, 80) in order to dissipate heat transferred from the first connecting conductors (12) into the heat dissipation area.

Description

Technical area

[0001] The present disclosure relates to a storage battery module equipped with battery cells. Technological background

[0002] In a storage battery module equipped with battery cells, flexible printed circuits (FPC) substrates are used as a means for electrically connecting the battery cells to each other. In a storage battery module disclosed in Patent Literature 1, a first circuit that detects a voltage between terminals of a battery cell is mounted on an FPC substrate provided on one side of a battery pack, and a voltage detection line is provided for electrically connecting the first circuit to a positive or negative electrode of each battery cell. Citation listPatent literature

[0003] Patent Literature 1: International Publication No. WO 2012 / 011 237 A1 Summary of the inventionTechnical problem

[0004] In the storage battery module equipped with battery cells disclosed in Patent Literature 1, a temperature of a battery cell located at the center of the battery cells in an arrangement direction becomes higher than a temperature of a battery cell located at one end in the arrangement direction, resulting in a variation in resistivity between the battery cells. There is a problem where a lifetime of the storage battery module as a whole is shortened due to a variation in lifetimes between battery cells caused by a variation in voltages between the battery cells due to a variation in resistivity.

[0005] The document DE 10 2009 043 526 A1 relates to a device for storing electrical energy.

[0006] The document DE 10 2012 213 273 A1 relates to an energy storage device.

[0007] The document DE 10 2009 035 465 A1 relates to a battery, in particular a vehicle battery.

[0008] In view of such circumstances described above, it is an object of the present disclosure to suppress or prevent temperature deviation between the battery cells. Solution to the problem

[0009] To achieve this object, a storage battery module according to claim 1 and claim 4 is proposed. Advantageous effects of the invention

[0010] According to the present disclosure, temperature deviation between the battery cells can be suppressed or prevented by providing the first plate-shaped member with a conductor formed therein to electrically connect the terminals of the battery cells and the second plate-shaped member with a heat spreading region to spread heat transferred from the conductor of the first plate-shaped member within the heat spreading region. Short description of the drawings Fig. 1 illustrates a perspective view of a storage battery module according to Embodiment 1 of the present disclosure; Fig. 2 is a plan view illustrating a first plate-shaped member according to Embodiment 1; Fig. 3 is a plan view illustrating an insulating member according to Embodiment 1; Fig. 4 is a plan view illustrating a second plate-shaped member according to Embodiment 1; Fig. 5 illustrates a plan view of the storage battery module according to Embodiment 1; Fig. 6 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 1; Fig. 7 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 1; Fig. 8 is a plan view illustrating the first plate-shaped member according to Embodiment 1; Fig. 9 illustrates a perspective view of a storage battery module according to Embodiment 2 of the present disclosure; Fig. 10 illustrates a plan view of the storage battery module according to Embodiment 2; Fig. 11 is a plan view illustrating a second plate-shaped member according to Embodiment 2; Fig. 12 is a plan view illustrating a third plate-shaped member according to Embodiment 2; Fig. 13 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 2; Fig. 14 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 2; Fig. 15 is another plan view illustrating the second plate-shaped member according to Embodiment 2; Fig. 16 illustrates a perspective view of a storage battery module according to Embodiment 3 of the present disclosure; Fig. 17 illustrates a plan view of the storage battery module according to Embodiment 3; Fig. 18 illustrates a plan view of the storage battery module according to Embodiment 3; Fig. 19 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 3; Fig. 20 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 3; and Fig. 21 is a plan view illustrating the second plate-shaped member according to Embodiment 3. Description of the embodiments

[0011] Embodiments of the present disclosure are described in detail below with reference to the drawings. Components that are the same or equivalent are denoted by the same reference numerals throughout the drawings. Embodiment 1

[0012] Fig. 1 illustrates a perspective view of a storage battery module according to Embodiment 1 of the present disclosure. A storage battery module 1 includes battery cells 51 stored within a housing 50, a first plate-shaped member 10 having a conductor formed therein for electrically connecting terminals 52 of the battery cells 51, and a second plate-shaped member 20 opposite the first plate-shaped member 10 via an insulating member 30, wherein the second plate-shaped member 20 has a heat spreading region, which will be described in more detail below. In one example of the Fig. 1, although the storage battery module 1 is equipped with six battery cells, the number of battery cells 51 could be any number greater than or equal to two. The storage battery module 1 has through-holes 40, 41, and 42 formed therein, which extend through the first plate-shaped member 10, the insulating member 30, and the second plate-shaped member 20. The terminals 52 of the battery cell 51 are passed through each of the through-holes 40. A positive terminal 53 of the storage battery module 1 is passed through the through-hole 41. A negative terminal 54 of the storage battery module 1 is passed through the through-hole 42.

[0013] The insulating member 30 has a thickness equal to or less than a first threshold value in a direction perpendicular to a main surface of the first plate-shaped member 10. The first threshold value can be determined in accordance with an amount of heat generated in the conductor formed on the first plate-shaped member 10 and a property of a material constituting the insulating member 30. At least a portion of the conductor formed on the first plate-shaped member 10 faces a heat spreading region of the second plate-shaped member 20 via the insulating member 30. The insulating member 30 transfers heat transferred from the conductor of the first plate-shaped member 10 to the heat spreading region of the second plate-shaped member 20 in a state where the conductor of the first plate-shaped member 10 and the heat spreading region of the second plate-shaped member 20 are insulated from each other.By allowing the insulating member 30 separating the first plate-shaped member 10 and the second plate-shaped member 20 to have a thickness less than or equal to the first threshold value, heat generated in the first plate-shaped member 10 can be transferred to the heat dissipation region of the second plate-shaped member 20, causing the heat to disperse within the heat dissipation region. By allowing the heat to disperse within the heat dissipation region, temperature deviation between the battery cells 51 can be suppressed or prevented.By making the thickness of the insulating member 30 thinner while maintaining a state in which the conductor of the first plate-shaped member 10 and the heat spreading region of the second plate-shaped member 20 are insulated from each other, the heat generated by the conductor of the first plate-shaped member 10 can be efficiently transferred to the heat spreading region of the second plate-shaped member 20.

[0014] In Embodiment 1, the first plate-shaped member 10, the insulating member 30, and the second plate-shaped member 20 are preferably incorporated into a single multi-layer print substrate. Fig. Figure 2 is a plan view illustrating the first plate-shaped member according to Embodiment 1. The first plate-shaped member 10 has through-holes 15 through which the terminals 52 of the battery cells 51 are passed, a through-hole 16 through which the positive terminal 53 is passed, and a through-hole 17 through which the negative terminal 54 is passed. Fig. 2, the area indicated by diagonal lines is a first insulator 11, and the areas indicated by dots are first connecting conductors 12 and conductors 13 and 14. The first connecting conductor 12 electrically connects the terminals 52 of the battery cells 51 that are adjacent to each other. The first connecting conductors 12 are separated from each other by the first insulator 11. The conductor 13 connects the positive terminal 53, which is passed through the through hole 16, to the terminal 52 of the battery cell 51 inserted through the through hole 15. The conductor 14 connects the negative terminal 54, which is passed through a through hole 17, and the terminal 52 of the battery cell 51, which is passed through the through hole 15. The first connecting conductors 12, the conductor 13, and the conductor 14 are separated from each other by the first insulator 11.

[0015] Fig. 3 is a plan view illustrating an insulating member according to Embodiment 1. In Fig. 3, the insulating member 30, indicated by diagonal lines, has through holes 31 through which the terminals 52 of the battery cells 51 are passed, a through hole 32 through which the positive terminal 53 is passed, and a through hole 33 through which the negative terminal 54 is passed.

[0016] Fig. Fig. 4 is a plan view illustrating a second plate-shaped member according to Embodiment 1. The second plate-shaped member 20 has through-holes 25 through which the terminals 52 of the battery cells 51 are passed, a through-hole 26 through which the positive terminal 53 is passed, and a through-hole 27 through which the negative terminal 54 is passed. Fig. 4, the area indicated by diagonal lines is a second insulator 21, and the areas indicated by dots are second connecting conductors 22 and conductors 23 and 24. The second connecting conductor 22 electrically connects the terminals 52 of the battery cells 51 that are adjacent to each other. The second connecting conductors 22 are separated from each other by the second insulator 21. The conductor 23 electrically connects the positive terminal 53, which is passed through the through hole 26, and the terminal 52 of the battery cell 51, which is passed through a through hole 25. The conductor 24 electrically connects the negative terminal 54, which is passed through a through hole 27, and the terminals 52 of the battery cell 51, which are passed through the through holes 25. The second connecting conductors 22, the conductor 23, and the conductor 24 are separated from each other by the second insulator 21.

[0017] The conductor 24 constitutes a heat dissipation region, and, as described above, the conductor 24 dissipates heat transferred from the first connecting conductors 12 and the conductors 13 and 14 of the opposing first plate-shaped member 10 to the interior of the heat dissipation region. The second connecting conductors 22 are smaller than the first connecting conductors 12, so that the conductor 24 opposes at least a portion of the first connecting conductors 12. The conductor 24 constitutes a member having a thermal conductivity greater than or equal to a second threshold value. The second threshold value can be determined in accordance with an amount of heat generated by the first plate-shaped member 10. In Embodiment 1, the conductor 24 is made of copper.

[0018] Through-holes 15, 25, and 31 collectively form each of the through-holes 40, the through-holes 16, 26, and 32 collectively form the through-hole 41, and through-holes 17, 27, and 33 collectively form the through-hole 42. A circuit that connects the battery cells 51 in series is formed by fixing the first plate-shaped member 10, the insulating member 30, and the second plate-shaped member 20 together in a state where the terminals 52 of the battery cells 51 are passed through the through-holes 40, the positive terminal 53 is passed through the through-hole 41, and the negative terminal 54 is passed through the through-hole 42.

[0019] Fig. 5 shows a plan view of the storage battery module according to Embodiment 1. In Fig. 5, solid arrows indicate a current flow in the second connecting conductors 22, the conductors 23 and 24 located in the second plate-shaped member 20, and dashed arrows indicate the current flow within the battery cells 51. Current flows from the positive terminal 53, via the conductor 23 and the terminal 52, to the battery cell 51 are located at the right end of the Fig. 5. A current flowing within the battery cell 51 then enters the adjacent battery cell 51 via the terminal 52 and the second connecting conductor 22. In this way, a current flows from the battery cell 51 located at the right end of the Fig. 5, to the battery cell 51, which is located at the left end of the Fig. 5. The current flows via conductor 24 from terminal 52 of battery cell 51, which is located at the left end of the Fig. 5, to the negative terminal 54. In a similar manner, a current flows in the first plate-shaped member 10. A current flowing as described above causes the temperature around the battery cells 51 located in the center of the storage battery module 1 to become higher than other areas within the storage battery module 1.

[0020] Fig. 6 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 1. Fig. Figure 6 shows a section of a cross-sectional view along a line AA in Fig. 5. A single-layer substrate is formed in a sequence of the first plate-shaped member 10, the insulating member 30, and the second plate-shaped member 20, and this substrate is fixed to the terminals 52 of the battery cells 51 by means of nuts 55. In Fig. 6, the areas indicated by diagonal lines are the first insulator 11, the second insulator 21 and the insulating member 30, and the areas indicated by dots are the first connecting conductors 12, the second connecting conductors 22 and conductors 13, 14, 23 and 24. In Fig. 6, solid arrows indicate a current flow. In the example of Fig. 6, the through-holes 40 are through-hole conductors, and the first connecting conductor 12 and the second connecting conductor 22, which electrically connect the same adjacent terminals 52 of the battery cells 51, are conductive. The first connecting conductor 12 and the second connecting conductor 22, which electrically connect the same adjacent terminals 52 of the battery cells 51, may be insulated by the insulating member 30. In such a case, the current flowing within the battery cell 51 branches from the terminal 52 into the first connecting conductor 12 and the second connecting conductor 22, and then enters the adjacent battery cell 51. Likewise, the conductor 13 and the conductor 23 may be conductive or may be insulated from each other by the insulating member 30. Furthermore, the conductor 14 and the conductor 24 may be conductive or may be insulated from each other by the insulating member 30.

[0021] Fig. 7 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 1. Fig. Figure 7 shows a cross-sectional view along a line BB in Fig. 5. Fig. 7 is in a similar way to that of the Fig. 6. The first connecting conductor 12 and the conductor 24, which represents the heat spreading area, are opposite each other via the insulating member 30, and the conductor 14 and the conductor 24 are opposite each other via the insulating member 30. As indicated by solid white arrows in Fig. As indicated in Figure 7, the heat generated by the first connecting conductors 12 is transferred through the conductors 24 via the insulating member 30, and then the heat is dissipated within the conductor 24. Therefore, temperature deviation between the battery cells 51 can be suppressed or prevented.

[0022] Fig. Fig. 8 is a plan view illustrating the first plate-shaped member according to Embodiment 1. In the example of Fig. 8, the first plate-shaped member 10 has a control circuit 60 formed therein. The control circuit 60 and the conductor 14 are separated from each other by an insulator 61. The control circuit 60 is connected to each of the first connecting conductors 12 and to each of the conductors 13 and 14 through a voltage measurement pattern 62. The control circuit 60 measures electrical potentials of the first connecting conductor 12 and the conductors 13 and 14 obtained via the voltage measurement pattern 62 and performs control to maintain the same voltage for all battery cells 51 based on the measured electrical potential.

[0023] As described above, by providing the first plate-shaped member 10 and the second plate-shaped member 20 with a heat dissipation area that allows heat transferred from the first connecting conductors 12 to dissipate into the heat dissipation area, the storage battery module 1 according to Embodiment 1 can suppress or prevent temperature deviation between the battery cells 51. Since temperature deviation between the battery cells 51 can be suppressed or prevented, the service life of the storage battery module 1 can be extended. Furthermore, the use of rigid substrates, such as the first plate-shaped member 10 and the second plate-shaped member 20, instead of flexible printed circuit boards (FPCs), can minimize the possibility of a short circuit caused by a worker inadvertently touching certain areas. Also, manufacturing costs can be minimized by using rigid substrates, such asthe first plate-shaped member 10 and the second plate-shaped member 20, instead of FPC substrates, which have high initial costs due to the need for a separate mold. Embodiment 2

[0024] Fig. 9 illustrates a perspective view of a storage battery module according to Embodiment 2 of the present disclosure. The storage battery module 1 according to Embodiment 2, which has the configuration of Embodiment 1, also includes a third plate-shaped member 70 opposed to the second plate-shaped member 20 via the insulating member 30. The storage battery module 1 of Embodiment 2 has through-holes 43, 44, and 45 formed therein, which extend through the first plate-shaped member 10, the second plate-shaped member 20, the insulating member 30, and the third plate-shaped member 70. The terminals 52 of the battery cell 51 are passed through the through-holes 43. The positive terminal 53 is passed through the through-hole 44. The negative terminal 54 is passed through the through-hole 45.In Embodiment 2, the first plate-shaped member 10, the second plate-shaped member 20, the third plate-shaped member 70, and the insulating member 30 are included in a single multi-layer printed substrate.

[0025] Fig. 10 shows a plan view of the storage battery module according to Embodiment 2. In Fig. 10, the second plate-shaped member 20, the insulating member 30, and the third plate-shaped member 70 are omitted. The sizes of the first connecting conductors 12 and the conductors 13 and 14 of the first plate-shaped member 10 according to Embodiment 2 are different from those in Embodiment 1. The manner in which a current flows in the first plate-shaped member 10 is similar to that in Embodiment 1. Fig. Fig. 11 is a plan view illustrating the second plate-shaped member according to Embodiment 2. The second plate-shaped member 20 has through holes 25, 26, and 27 formed therein, similar to Embodiment 1. In Fig. 11, the area indicated by diagonal lines is the second insulator 21, and the area indicated by dots is a conductor 28. The conductor 28 represents a heat dissipation area and electrically connects the terminal 52 of the battery cell 51, which is passed through the through-hole 25 of the conductor 28, to the negative terminal 54, which is inserted through the through-hole 27. In Fig. 11, a solid arrow indicates a current flow within the conductor 28 in the second plate-shaped member 20. In the example of Fig. 11, with the exception of terminal 52, which is electrically connected to negative terminal 54, conductor 28 is separated from terminals 52 by second insulator 21.

[0026] Fig. 12 is a plan view illustrating a third plate-shaped member according to Embodiment 2. In Fig. In Fig. 12, the area indicated by diagonal lines represents an insulator 71, and the areas indicated by dots represent conductors 72, 73, and 74. The third plate-shaped member 70 has (i) through-holes 75 through which the terminals 52 of the battery cells 51 are passed, (ii) a through-hole 76 through which the positive terminal 53 is passed, and (iii) a through-hole 77 through which a negative terminal 54 is passed formed therein. The conductor 72 electrically connects the terminals 52 of the battery cells 51 that are adjacent to each other. The size of the conductors 72 is the same as the size of the first connecting conductor 12. The conductor 73 electrically connects the positive terminal 53, which is passed through the through-hole 76, to the terminals 52 of the battery cells 51. The third plate-shaped member 70 has the control circuit 60 formed therein.The control circuit 60 is connected to each of the conductors 72, 73, and 74 through the voltage measurement pattern 62. The control circuit 60 measures electrical potentials of the conductors 72, 73, and 74 obtained through the voltage measurement pattern 62 and performs control to maintain the same voltage for all battery cells 51 based on the measured electrical potentials.

[0027] The through-holes 15, 25, 31, and 75 collectively constitute each of the through-holes 43, the through-holes 16, 26, 32, and 76 collectively constitute the through-hole 44, and the through-holes 17, 27, 33, and 77 collectively constitute the through-hole 45. A circuit that connects the battery cells 51 in series is formed by connecting the members to each other in an order of the first plate-shaped member 10, the insulating member 30, the second plate-shaped member 20, the insulating members 30, and the third plate-shaped member 70 in a state where the terminals 52 of the battery cells 51 are passed through the through-holes 43, the positive terminal 53 is passed through the through-hole 44, and the negative terminal 54 is passed through the through-hole 45.

[0028] Fig. 13 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 2. Fig. Fig. 13 shows a part of a cross-sectional view of the storage battery module 1 taken along a line CC in the Fig. 10 to 12. In a sequence of the first plate-shaped member 10, the insulating member 30, the second plate-shaped member 20, the insulating member 30 and the third plate-shaped member 70, these members are layered or stacked and then fastened to the terminals 52 of the battery cells 51 by the nuts 55. In Fig. 13, the areas indicated by diagonal lines are the first insulator 11, the second insulator 21, the insulating member 30 and the insulator 71, and the areas indicated by dots are the first connecting conductors 12 and the conductors 13, 14, 28, 72, 73 and 74. In Fig. 13, arrows with solid lines indicate a current flow. In the example of Fig. 13, the through-holes 43 are through-hole conductors, and the first connecting conductor 12 and the conductor 72, which electrically connect the same adjacent terminals 52 of the battery cells 51, are conductive. The first connecting conductor 12 and the conductor 72, which electrically connect the same adjacent terminals 52 of the battery cells 51, may be insulated by the insulating member 30. In such a case, the current flowing within the battery cell 51 branches from the terminal 52 into the connecting conductor 12 and into the conductor 72, and then enters the adjacent battery cell 51. Likewise, the conductor 13 and the conductor 73 may be conductive or may be insulated from each other by the insulating member 30. Furthermore, the conductor 14 and the conductor 74 may be conductive and / or may be insulated from each other by the insulating member 30.

[0029] Fig. 14 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 2. Fig. 14 shows a part of the cross-sectional view of the storage battery module 1 along a line DD in the Fig. 10 to 12. Fig. 14 is in a similar way to that of the Fig. 13. The first connecting conductor 12 and the conductor 28 are opposite each other via the insulating member 30, and the conductor 72 and the conductor 28 are opposite each other via the insulating member 30. As indicated by the solid white arrows in Fig. 14, heat generated by the first connecting conductor 12 is transferred to the conductor 28 via the insulating member 30, and then the heat is dissipated within the conductor 28. Therefore, temperature deviation between the battery cells 51 can be suppressed or prevented.

[0030] Fig. 15 shows another plan view illustrating the second plate-shaped member according to Embodiment 2. The conductor 28 and all terminals 52 of the battery cells 51 passed through the through-holes 25 may be separated from each other by the second insulator 21.

[0031] As described above, by providing the first plate-shaped member 10 and the second plate-shaped member 20 equipped with a heat dissipation region that allows heat transferred from the first connecting conductors 12 to dissipate into the heat dissipation region, the storage battery module 1 according to Embodiment 2 can suppress or prevent temperature deviation between the battery cells 51. Since temperature deviation between the battery cells 51 can be suppressed or prevented, the service life of the storage battery module 1 can be extended. Since the conductor 28 has a surface area larger than a surface area of ​​the conductor 24, heat generated by the first connecting conductors 12 can be dissipated even more efficiently than in Embodiment 1. Embodiment 3

[0032] Fig. 16 illustrates a perspective view of a storage battery module according to Embodiment 3 of the present disclosure. The storage battery module 1 according to Embodiment 3 includes a plurality of first plate-shaped members 80, which are copper substrates. The first plate-shaped members 80 have through-holes 81 through which the terminals 52 of the battery cell 51 are passed. The storage battery module 1 according to Embodiment 3 has through-holes 46 and 47 formed therein, which extend through the second plate-shaped member 20 and the insulating member 30. The terminals 52 of the battery cells 51 are passed through the through-holes 46. The negative terminal 54 is passed through the through-hole 47. The second plate-shaped member 20 is also a copper substrate in Embodiment 3.

[0033] Fig. 17 shows a plan view of the storage battery module according to Embodiment 3. In Fig. 17, the insulating member 30 and the second plate-shaped member 20 are omitted. The first plate-shaped member 80 electrically connects the terminals 52 of the battery cells 51 that are adjacent to each other. Fig. 17, arrows with solid lines indicate a current flow within the first plate-shaped members 80, and dashed arrows indicate a current flow within the battery cells 51. The terminal 52 of the battery cell 51, which is located at the right end of the Fig. 17 is electrically connected to the positive terminal 53. Current flows from the positive terminal 53 to the battery cell 51, which is located at the right end of the Fig. 17. A current flowing within the battery cell 51 then enters the adjacent battery cell 51 via the terminal 52 and the first plate-shaped member 80. In this way, a current flows from the battery cell 51 located at the right end of the Fig. 17, to the battery cell 51, which is located at the left end of the Fig. 17 is located.

[0034] Fig. 18 shows a plan view of the storage battery module according to Embodiment 3. The second plate-shaped member 20 has the through-holes 25 formed therein, through which the terminals 52 of the battery cells 51 are passed, and the through-hole 27 through which the negative terminal 54 is passed. A portion of a copper substrate 29 formed on the second plate-shaped member 20 is covered by the second insulator 21. The copper substrate 29 constitutes a heat dissipation region. The copper substrate 29 connects the terminal 52 of the battery cell 51 located at the left end of the Fig. 18, and the negative terminal 54. Except for terminal 52, which is electrically connected to the negative terminal 54, the copper substrate 29 is separated from the terminals 52 by the second insulator 21. In Fig. 18, a solid line arrow indicates a current flow within the copper substrate 29. Current flows from the terminal 52 of the battery cell 51, which is located at the left end of the Fig. 18, to the negative terminal 54 via the copper substrate 29.

[0035] Although the configuration of the insulating member 30 is similar to that in Embodiment 1, the insulating member 30 in Embodiment 3 has the through hole 32 shown in Fig. 3. The through-holes 25 and 31 together form the through-holes 46, respectively, and the through-holes 27 and 33 together form the through-hole 47. A circuit that connects the battery cells 51 in series is formed by fixing the first plate-shaped members 80, the insulating member 30, and the second plate-shaped member 20 together in a state where the terminals 52 of the battery cells 51 are passed through the through-holes 81 and the through-holes 46, and the negative terminal 54 is passed through the through-hole 47.

[0036] Fig. 19 illustrates a partial cross-sectional view of a storage battery module according to Embodiment 3. Fig. Fig. 19 shows a part or section of the cross-sectional view of the storage battery module 1 along a line EE in the Fig. 17 and Fig. 18. In a sequence of the first plate-shaped members 80, the insulating member 30 and the second plate-shaped member 20, these members are layered or stacked and then secured by the nuts 55 to the terminals 52 of the battery cells 51. In Fig. 19, the areas indicated by diagonal lines are the second insulator 21 and the insulating member 30, and the areas indicated by dots are the first plate-shaped members 80 and the copper substrate 29. In Fig. 19, the arrows with solid lines indicate a current flow.

[0037] Fig. 20 illustrates a partial cross-sectional view of the storage battery module according to Embodiment 3. Fig. Fig. 20 shows a part of the cross-sectional view of the storage battery module 1 taken along a line FF in the Fig. 17 and Fig. 18. Fig. 20 is in a similar way to that of the Fig. 19. The first plate-shaped members 80 and the copper substrate 29 are opposite each other via the insulating member 30. As indicated by the solid white arrows in Fig. 20, heat generated by the first plate-shaped members 80 is transferred to the copper substrate 29 via the insulating member 30, and then the heat is dissipated within the copper substrate 29. Therefore, temperature deviation between the battery cells 51 can be suppressed or prevented.

[0038] Fig. 21 is a plan view illustrating the second plate-shaped member according to Embodiment 3. In the second plate-shaped member 20, the copper substrate 29 and all terminals 52 of the battery cells 51 may be separated from each other by the insulator 21.

[0039] In Embodiment 3, a control circuit that performs cell balancing control may be mounted on the copper substrate 29 of the second plate-shaped member 20, or a substrate mounted with a control circuit may be connected to the first plate-shaped members 80 and the second plate-shaped member 20.

[0040] As described above, by providing the first plate-shaped members 80 and the second plate-shaped member 20 equipped with the copper substrate 29 that allows heat transferred from the first plate-shaped members 80 to spread into the copper substrate 29, the storage battery module 1 according to Embodiment 3 can suppress or prevent temperature deviation between the battery cells 51. Since temperature deviation between the battery cells 51 can be suppressed or prevented, the service life of the storage battery module 1 can be extended. Since the copper substrate 29 is used for the second plate-shaped member 20, the thickness is increased to a greater extent than in the case of Embodiments 1 and 2 where the copper substrate 29 is used.printed substrate is used, and thus the heat is dissipated to a greater extent and temperature deviation between the battery cells 51 can be prevented or suppressed to a greater extent.

[0041] Embodiments of the present invention are not limited to the above embodiments. A plurality of the first plate-shaped member 10, the second plate-shaped member 20, and / or the third plate-shaped member 70 may be provided in accordance with the current flowing through the battery cells 51. In Embodiment 1, the positions of the first plate-shaped member 10 and the second plate-shaped member 20 may be interchanged, and in Embodiment 2, the order of the first plate-shaped member 10, the second plate-shaped member 20, and the third plate-shaped member 70 may be changed.

[0042] The foregoing describes some exemplary embodiments for illustrative purposes. Although the foregoing discussion presents specific embodiments, those skilled in the art will recognize that changes in form and detail may be made without departing from the broader spirit and scope of the invention. Accordingly, the descriptions and drawings are to be regarded in an illustrative rather than a restrictive sense. This detailed description, therefore, is not to be taken in a limiting sense, and the scope of the invention is defined only by the included claims, along with the full scope of equivalents to which such claims are directed. List of reference symbols 1 storage battery module 10, 80 First plate-shaped segment 11 First insulator 12 First connection conductor 13, 14, 23, 24, 28, 72, 73, 74 ladder 15, 16, 17, 25, 26, 27, 31, 32, 33, 40, 41, 42, 43, 44, 45, 46, 47, 75, 76, 77, 81, 82 through hole 20 Second plate-shaped member 21 Second insulator 22 Second connecting conductor 29 Copper substrate 30 insulating element 50 housings 51 battery cells 52 connection 53 Positive connection 54 Negative connection 55 Mother 60 control circuit 61, 71 Insulator 62 voltage measurement patterns 70 Third plate-shaped member

Claims

[1] Storage battery module (1) comprising: Battery cells (51); a first plate-shaped member (10, 80) having first connecting conductors (12) formed therein, wherein the first connecting conductors (12) (i) are conductors that electrically connect terminals (52) of the battery cells (51) that are adjacent to each other, and (ii) are separated from each other by an insulator (11); and a second plate-shaped member (20) having a heat spreading region formed by a member having a thermal conductivity greater than or equal to a second threshold value, wherein the heat spreading region is opposed to at least a part of the first connecting conductors (12) of the first plate-shaped member (10, 80) via an insulating member (30) having a thickness less than or equal to a first threshold value in a direction perpendicular to a main surface of the first plate-shaped member (10, 80) to spread heat transferred from the first connecting conductors (12) into the heat spreading region. [2] Storage battery module according to claim 1, wherein the second plate-shaped member (20) has second connecting conductors (22) formed therein, wherein the second connecting conductors (22) (i) are conductors that electrically connect terminals (52) of the battery cells (51) that are adjacent to each other, and (ii) are separated from each other by a second insulator (21), and the heat spreading region (i) is a conductor (24) formed on the second plate-shaped member (20), the conductor (24) being separated from the second connecting conductors (22) by the second insulator (21). [3] The storage battery module according to claim 1, wherein the heat spreading region is (i) a conductor formed on the second plate-shaped member (20) and separated from all terminals (52) of the battery cells (51) by an insulator, or (ii) a conductor (28) formed on the second plate-shaped member (20) that electrically connects a terminal (53, 54) of the storage battery module (1) to a terminal (52) of one battery cell (51) among the battery cells (51), and separated from terminals of the other battery cells by a second insulator. [4] Storage battery module comprising: Battery cells (51); first plate-shaped members (80), each first plate-shaped member (80) being a conductor that electrically connects terminals (52) of the battery cells (51) that are adjacent to each other; and a second plate-shaped member (20) comprising an insulator (21) and a heat spreading region formed by a member having a thermal conductivity greater than or equal to a second threshold value, wherein the heat spreading region is opposed to at least a part of the conductors of the first plate-shaped members (80) via an insulating member (30) having a thickness less than or equal to a first threshold value in a direction perpendicular to a main surface of the first plate-shaped members (80) to spread heat transferred by the conductors into the heat spreading region, wherein the second plate-shaped member (20) is opposed to at least a part of the first plate-shaped members (80) via the insulating member (30), and the heat spreading region is (i) a conductor which is separated from all terminals (52) of the battery cells (51) by the insulator (21), or (ii) a conductor which electrically connects a terminal (52) of the storage battery module (1) to a terminal (52) of a battery cell (51) of the battery cells (51), and is separated from the other battery cells (51) by the insulator (21).

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