JP2016212980A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery module that can maintain contact with the housing of a heat transfer plate even when a battery cell is positionally displaced with respect to the housing.SOLUTION: A battery module 1 which is secured to a housing 70 includes an arrangement body 30 comprising a plurality of battery cells 11 arranged in one direction (arrangement direction D), and a plurality of first heat transfer plates 21 arranged so as to be in contact with the main surface 16 which is a surface intersecting to the arrangement direction of the battery cells. The first heat transfer plate has a first main body portion 23 which is in contact with the main surface, and a second main body portion 25 that is bent from one end side of the first main body portion in a direction intersecting to the main surface and is in contact with the housing. The intersection angle α between the first main body portion and the second main body portion is larger in the first heat transfer plate which is in contact with the battery cell located at the center of the arrangement body in the direction of arrangement.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a battery module.

  For example, a battery module including an array formed by arranging a plurality of battery cells such as a lithium ion secondary battery is known. And a battery module is attached to a housing | casing etc. and becomes a battery pack. In such a battery module, for example, in Patent Document 1, a heat transfer plate is disposed between battery cells, and one end side of the heat transfer plate is brought into contact with the housing. Thereby, the heat generated in the battery cell is released to the outside of the casing.

JP-T 8-506205

  However, there are cases where the position of the battery cell shifts with respect to the casing due to variations in the flatness of the heat transfer plate or a reaction force from the casing after assembly. In such a case, in the said conventional battery module, the contact to the housing | casing of a heat-transfer plate cannot fully be maintained, but heat dissipation deteriorates.

  Accordingly, an object of the present invention is to provide a battery module that can maintain the contact of the heat transfer plate with the housing even when the position of the battery cell is shifted with respect to the housing.

  The battery module of the present invention is a battery module that is attached to a housing, and is arranged so as to contact a plurality of battery cells arranged in one direction and a main surface that is a surface that intersects the direction of the battery cell arrangement. The first heat transfer plate includes a first main body portion that contacts the main surface, and a direction intersecting the main surface from one end side of the first main body portion. A second body part that bends in contact with the housing, and the crossing angle between the first body part and the second body part is the first that contacts the battery cell located at the center of the array in the direction of the array. One heat transfer plate is bigger.

  In the battery module having this configuration, since the second main body portion is bent from the first main body portion, a force to contact the casing acts on the second main body portion due to the bending reaction force. Thereby, even if it is a case where the position of a battery cell has shifted | deviated with respect to the housing | casing, the contact to the housing | casing of a heat-transfer plate can be maintained. Furthermore, in the battery module having this configuration, since the intersection angle between the first main body portion and the second main body portion is larger as the first heat transfer plate located at the center of the array body, the first heat transfer plate positioned at the center of the array body. The more the heat plate, the larger the amount of protrusion from the battery cell in the second main body portion. Therefore, when the battery module is attached to the housing, the first heat transfer plate located at the center of the array body is pressed. In other words, the first heat transfer plate located at the center of the array body has a larger bending reaction force and a greater force to contact the housing. As a result, the battery cell located at the center of the array can maintain the contact of the heat transfer plate to the housing even in a battery module that tends to shift away from the housing.

  In the battery module of the present invention, the second main body portion may be bent so as to form a parallel portion parallel to the arrangement direction.

  In the battery module having this configuration, since the parallel part parallel to the arrangement direction is formed in the second body part, the first heat transfer plate and the housing can be in surface contact. This enables efficient heat transfer and improves heat dissipation.

  The battery module of the present invention is a battery module that is attached to a housing, and is arranged so as to contact a plurality of battery cells arranged in one direction and a main surface that is a surface that intersects the direction of the battery cell arrangement. The heat transfer plate includes a plurality of first heat transfer plates and second heat transfer plates that are different in shape from each other. The first heat transfer plate has a first main body portion that contacts the main surface, and a second main body portion that bends in a direction intersecting the main surface from one end side of the first main body portion and contacts the housing. Yes. The second heat transfer plate has a third main body portion that contacts the main surface, a fourth main body portion that is bent in a direction intersecting the main surface from one end side of the third main body portion, and that contacts the housing. Irregularities are formed in the fourth main body portion.

  In the first heat transfer plate in the battery module having this configuration, the second main body portion is bent from the first main body portion. Therefore, in the second main body portion, the force to contact the casing is caused by the bending reaction force. work. Thereby, even if it is a case where the position of a battery cell has shifted | deviated with respect to the housing | casing, the contact to the housing | casing of a heat-transfer plate can be maintained. Moreover, since the 4th main-body part is also bent from the 3rd main-body part also in the 2nd heat-transfer plate in the battery module of this structure similarly to the 1st heat-transfer plate, in the 4th main-body part, the bending reaction force As a result, a force to contact the casing works. Thereby, even if it is a case where the position of a battery cell has shifted | deviated with respect to the housing | casing, the contact to the housing | casing of a heat-transfer plate can be maintained. Furthermore, since the unevenness is formed on the fourth main body, when the heat conductive sheet is disposed between the battery module and the housing, the contact area with the heat conductive sheet can be widened, and the efficiency Heat dissipation becomes possible.

  In the battery module of the present invention, the second main body portion may be bent so as to form a parallel portion parallel to the arrangement direction.

  In the battery module having this configuration, since the parallel part parallel to the arrangement direction is formed in the second body part, the first heat transfer plate and the housing can be in surface contact. This enables efficient heat transfer and improves heat dissipation.

  In the battery module of the present invention, the crossing angle between the first main body portion and the second main body portion may be increased as the first heat transfer plate is in contact with the battery cell positioned at the center of the array body in the array direction.

  In the battery module having this configuration, the first heat transfer plate positioned at the center of the array body has a larger intersection angle between the first body portion and the second body portion as the first heat transfer plate positioned at the center of the array body. The pop-out amount from the battery cell in the second main body portion increases. Therefore, when the battery module is attached to the housing, the first heat transfer plate located at the center of the array body is pressed. In other words, the first heat transfer plate located at the center of the array body has a larger bending reaction force and a greater force to contact the housing. As a result, the battery cell located at the center of the array can maintain the contact of the heat transfer plate to the housing even in a battery module that tends to shift away from the housing.

  The battery module of the present invention is a battery module that is attached to a housing, and is arranged so as to contact a plurality of battery cells arranged in one direction and a main surface that is a surface that intersects the direction of the battery cell arrangement. The second heat transfer plate includes a third main body portion that contacts the main surface, and a direction intersecting the main surface from one end side of the third main body portion. And a fourth main body portion that is bent in contact with the housing, and the fourth main body portion is formed with irregularities.

  In the second heat transfer plate in the battery module having this configuration, the fourth main body portion is bent from the third main body portion. Therefore, in the fourth main body portion, the force to contact the casing is caused by the bending reaction force. work. Thereby, even if it is a case where the position of a battery cell has shifted | deviated with respect to the housing | casing, the contact to the housing | casing of a 2nd heat exchanger plate can be maintained. Furthermore, since the unevenness is formed on the fourth main body, when the heat conductive sheet is disposed between the battery module and the housing, the contact area with the heat conductive sheet can be widened, and the efficiency Heat dissipation becomes possible.

  In the battery module of the present invention, the convex part of the irregularities in the fourth main body part may be formed only on the surface in contact with the housing.

  Such a battery module may be arranged, for example, in a state where the battery cell is held by a resin battery holder. In the battery module with this configuration, even if the battery module has such a configuration, the convex portion does not protrude toward the battery cell, so that damage to the battery holder can be suppressed.

  In the battery module of the present invention, the unevenness may be formed by the amplitude of the member forming the fourth main body portion.

  In the battery module having this configuration, the unevenness formed on the fourth body portion can be easily formed.

  In the battery module of the present invention, the amount of unevenness in the fourth main body may be increased as the second heat transfer plate is in contact with the battery cell located at the center of the array.

  In the battery module having this configuration, the second heat transfer plate located at the center of the array body has a larger amplitude in the fourth main body portion. Therefore, the second heat transfer plate located at the center of the array body has a battery cell in the fourth main body portion. The amount of popping out from will increase. Therefore, when the battery module is attached to the housing, the second heat transfer plate located at the center of the array body is pressed. In other words, the second heat transfer plate located at the center of the array body has a larger bending reaction force and a greater force to contact the housing. As a result, the battery cell located at the center of the array can maintain the contact of the heat transfer plate to the housing even in a battery module that tends to shift away from the housing.

  In the battery module of the present invention, the crossing angle between the third main body portion and the fourth main body portion may be increased as the second heat transfer plate is in contact with the battery cell located at the center of the array body in the array direction.

  In the battery module having this configuration, the second heat transfer plate positioned at the center of the array body has a larger intersection angle between the third body portion and the fourth body portion as the second heat transfer plate positioned at the center of the array body. The pop-out amount from the battery cell in the fourth main body increases. Therefore, when the battery module is attached to the housing, the second heat transfer plate located at the center of the array body is pressed. In other words, the second heat transfer plate located at the center of the array body has a larger bending reaction force and a greater force to contact the housing. As a result, the battery cell located at the center of the array can maintain the contact of the heat transfer plate to the housing even in a battery module that tends to shift away from the housing.

  In the battery module of the present invention, in the first heat transfer plate, the distance from the side surface intersecting the main surface of the battery cell to the second main body is made longer as it is located at the center of the battery cell in the direction of battery cell arrangement. May be.

  In the battery module having this configuration, the smaller the expansion amount in one battery cell, the shorter the distance from the side surface of the battery cell, and the larger the expansion amount, the longer the distance from the side surface of the battery cell. Thereby, it is possible to easily follow the expansion of the battery cell.

  In the battery module of the present invention, in the second heat transfer plate, the amplitude of the fourth main body portion may be as small as it is located at the center of the battery cell in the direction of the battery cell arrangement.

  In the battery module having this configuration, the smaller the expansion amount in one battery cell, the larger the amplitude, and the larger the expansion amount, the smaller the amplitude. Thereby, it is possible to easily follow the expansion of the battery cell.

  In the battery module of the present invention, the battery module is attached to the housing, and is arranged so as to contact a plurality of battery cells arranged in one direction and a main surface that is a surface intersecting the direction of the battery cell arrangement. The first heat transfer plate includes a first main body portion that contacts the main surface, and a direction intersecting the main surface from one end side of the first main body portion. The first heat transfer plate, the distance from the side surface intersecting the main surface of the battery cell to the second main body portion is the direction of the arrangement of the battery cells. In FIG. 2, it is longer as it is located at the center of the battery cell.

  In the battery module having this configuration, since the second main body portion is bent from the first main body portion, a force to contact the casing acts on the second main body portion due to the bending reaction force. Thereby, even if it is a case where the position of a battery cell has shifted | deviated with respect to the housing | casing, the contact to the housing | casing of a heat-transfer plate can be maintained. Furthermore, in the battery module having this configuration, it is possible to easily follow the expansion of the battery cell.

  In the battery module of the present invention, the second main body portion may be bent so as to form a parallel portion parallel to the arrangement direction.

  In the battery module having this configuration, since the parallel part parallel to the arrangement direction is formed in the second body part, the first heat transfer plate and the housing can be in surface contact. This enables efficient heat transfer and improves heat dissipation.

  In the battery module of the present invention, the crossing angle between the first main body portion and the second main body portion may be increased as the first heat transfer plate is in contact with the battery cell positioned at the center of the array body in the array direction.

  In the battery module having this configuration, the first heat transfer plate positioned at the center of the array body has a larger intersection angle between the first body portion and the second body portion as the first heat transfer plate positioned at the center of the array body. The pop-out amount from the battery cell in the second main body portion increases. Therefore, when the battery module is attached to the housing, the first heat transfer plate located at the center of the array body is pressed. In other words, the first heat transfer plate located at the center of the array body has a larger bending reaction force and a greater force to contact the housing. As a result, the battery cell located at the center of the array can maintain the contact of the heat transfer plate to the housing even in a battery module that tends to shift away from the housing.

  According to the present invention, even if the distance between each of the plurality of battery cells and the housing is different, the contact of the heat transfer plate with the housing can be maintained.

It is a perspective view showing the whole battery module composition concerning a 1st embodiment. It is a side view which shows the array body of FIG. FIG. 2 is a side view showing one battery cell and one first heat transfer plate in FIG. 1. It is the figure which showed how to attach the battery module of FIG. 1 to the housing | casing. It is sectional drawing which showed the state which the battery cell of the battery module attached to the housing | casing shifted | deviated. It is a side view which shows the 2nd heat-transfer plate and one battery cell which concern on 2nd and 3rd embodiment. It is a side view showing the 2nd heat transfer plate and one battery cell concerning the 4th modification. It is the side view which shows the 2nd heat-transfer plate which concerns on a 5th modification, and one battery cell, and the top view which looked at the 2nd heat-transfer plate from the housing | casing side. It is a side view which shows the 1st heat exchanger plate and one battery cell which concern on a 6th modification and a 7th modification. It is a side view which shows the 2nd heat exchanger plate and one battery cell which concern on an 8th modification. It is a side view showing the 1st heat transfer plate and one battery cell concerning the 9th modification.

  Hereinafter, a battery module 1 according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings do not necessarily match those described.

[First Embodiment]
As shown in FIGS. 1 and 2, the battery module 1 according to the first embodiment includes a plurality of battery cells 11 arranged in one direction (arrangement direction D), and a surface that intersects the arrangement direction D of the battery cells 11. And a plurality of first heat transfer plates 21 arranged so as to be in contact with the main surface 16. 2, 4, and 5 are views of the array body 30 as viewed from the side, but illustration of the electrode terminals 14 </ b> A and 14 </ b> B and the connection member 15 of the battery cell 11 is omitted.

  Further, the plurality of battery cells 11 are integrated with the first heat transfer plate 21 by the restraining tool 50. The restraining tool 50 includes, for example, a pair of end plates 51 that sandwich the plurality of battery cells 11 from the juxtaposed direction, and a rod-shaped connecting member 53 that is disposed on the side of the battery cells 11 and connects the pair of end plates 51. And a plurality of bolts 55 for fixing the connecting member 53 to the end plate 51 in a state where the plurality of battery cells 11 are sandwiched by the end plate 51. A restraining load is applied to the plurality of battery cells 11 by the restraining tool 50. As will be described in detail later, such a battery module 1 is attached to a housing 70 (see FIG. 4) to form a battery pack.

  The battery cell 11 is a storage battery such as a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, or an electric double layer capacitor. The battery cell 11 is configured, for example, by housing an electrode assembly 13 formed by laminating a negative electrode, a separator, and a positive electrode in a case 12 into which an electrolytic solution is injected.

  The negative electrode and the positive electrode of the electrode assembly 13 are fixed in an insulated state to the case 12 and are electrically connected to a pair of electrode terminals 14A and 14B protruding from the case 12, respectively. One of the pair of electrode terminals 14A and 14B functions as a negative electrode terminal, and the other functions as a positive electrode terminal. The electrode terminals 14A and 14B of adjacent battery cells 11 are connected by a connecting member 15 having conductivity such as a bus bar. Thereby, the some battery cell 11 is electrically connected in series.

  The first heat transfer plate 21 is bent in a direction (array direction D) intersecting the main surface 16 from one end side of the first main body portion 23 and the first main body portion 23 in contact with the main surface 16, and the housing 70 (FIG. 4), the second main body 25 is in direct or indirect contact with the housing 70.

  As shown in FIG. 3, the second main body 25 is bent from the first main body 23 by an angle α. In other words, the first main body portion 23 and the second main body portion 25 intersect at an angle α. As shown in FIG. 2, the angle α at which the first main body portion 23 and the second main body portion 25 intersect with each other is the first transmission that contacts the battery cell 11 positioned at the center of the array body 30 in the array direction D. It is as large as the heat plate 21.

  Specifically, as shown in FIG. 3, the battery cell 11A, the battery cell 11B, the battery cell 11C, the battery cell 11D, and the battery cell 11E are arranged in this order from one end of the array body 30, and the angle α is The first heat transfer plate 21A, the first heat transfer plate 21B, the first heat transfer plate 21C, the first heat transfer plate 21D, and the first heat transfer plate 21E increase in this order. Similarly, the battery cell 11I, the battery cell 11H, the battery cell 11G, the battery cell 11F, and the battery cell 11E are arranged in this order from the other end side of the array 30. The angle α is the first heat transfer plate 21I, The heat transfer plate 21H, the first heat transfer plate 21G, the first heat transfer plate 21F, and the first heat transfer plate 21E increase in order.

  The battery module 1 having the above-described configuration is attached to the housing 70 to form a battery pack. As shown in FIG. 4, when the battery module 1 is attached to the housing 70, the battery module 1 is attached via a bracket fixed to the pair of end plates 51. A TIM (Thermal Interface Material) 75 serving as a heat conductive sheet is disposed between the array 30 and the housing 70. That is, the second main body portion 25 of the first heat transfer plate 21 is in contact with the housing 70 via the TIM (in a state where the TIM is interposed).

  In the battery module 1 having this configuration, the angle α at which the first main body portion 23 and the second main body portion 25 intersect in the first heat transfer plate 21 is larger as the first heat transfer plate 21 located at the center of the array 30. Therefore, the first heat transfer plate 21 located at the center of the array 30 has a larger amount of protrusion from the side surface 17 of the battery cell 11 in the second main body portion 25. Specifically, the first heat transfer plate 21A (first heat transfer plate 21I), the first heat transfer plate 21B (first heat transfer plate 21H), the first heat transfer plate 21C (first heat transfer plate 21G), In the order of the first heat transfer plate 21D (first heat transfer plate 21F) and the first heat transfer plate 21E, the amount of protrusion from the side surface 17 of the battery cell 11 in the second main body 25 increases.

  Therefore, when the battery module 1 is attached to the housing 70, the first heat transfer plate 21 positioned at the center of the array 30 is pressed. In other words, the first heat transfer plate 21 located at the center of the array 30 has a larger bending reaction force and is attached to the housing 70 in a state where the force to contact the housing 70 is large.

  Next, the effect of the battery module 1 of 1st Embodiment is demonstrated. In the battery module 1 of the first embodiment, since the second main body portion 25 is bent from the first main body portion 23, the second main body portion 25 has a force to contact the housing 70 by the bending reaction force. Work. Thereby, even if it is a case where the position of the battery cell 11 has shifted | deviated with respect to the housing | casing 70, the contact to the housing | casing 70 of the 1st heat exchanger plate 21 can be maintained.

  As shown in FIG. 5, in the battery module 1 attached to the housing 70, the battery cell 11 located at the center of the array body 30 tends to shift away from the housing 70. In the battery module 1 of the first embodiment, the intersection angle α between the first main body portion 23 and the second main body portion 25 is larger as the first heat transfer plate 21 located at the center of the array body 30. The first heat transfer plate 21 located at the center has a larger amount of protrusion from the side surface 17 of the battery cell 11 in the second main body portion 25. Therefore, when the battery module 1 is attached to the housing 70, the first heat transfer plate 21 positioned at the center of the array 30 is pressed. In other words, the first heat transfer plate 21 located at the center of the array 30 has a greater bending reaction force and a greater force to contact the housing 70. As a result, the battery cell 11 located at the center of the array 30 maintains the contact of the first heat transfer plate 21 to the casing 70 even in the battery module 1 that tends to shift away from the casing 70. can do.

[Second Embodiment]
Next, the battery module 101 according to the second embodiment will be described. The battery module 101 of the second embodiment is different from the battery module 1 of the first embodiment in that a second heat transfer plate 121 having a shape different from that of the first heat transfer plate 21 is used instead of the first heat transfer plate 21. It is a point that is arranged. Here, the second heat transfer plate 121 will be described in detail, and the description of the configuration common to the first embodiment will be omitted.

  As shown in FIG. 6, the second heat transfer plate 121 includes a third main body portion 123 that contacts the main surface 16 of the battery cell 11 and a direction intersecting the main surface 16 from one end side of the third main body portion 123. A fourth body portion 125 that bends and contacts the housing 70 directly or indirectly. Further, the fourth main body portion 125 is provided with irregularities 127. And the unevenness | corrugation 127 is formed of the amplitude of the member which forms the 4th main-body part 125. FIG.

  The fourth body portion 125 is bent from the third body portion 123 by an angle α1. In other words, the third main body 123 and the fourth main body 125 intersect at an angle α1. In addition, the 4th main-body part 125 in the battery module 101 of 2nd Embodiment contacts the battery cell 11 located in the center of the array body 30 in the arrangement direction D like the battery module 1 which concerns on 1st Embodiment. 2 The angle α1 is not as large as the heat transfer plate 121 but is constant. Moreover, the amplitude A of the 4th main-body part 125 in all the 2nd heat exchanger plates 121 is constant.

  Next, the effect of the battery module 101 of 2nd Embodiment is demonstrated. In the second heat transfer plate 121 in the battery module 101 of the second embodiment, the fourth main body portion 125 is bent from the third main body portion 123. The force which tries to contact 70 works. Thereby, even if it is a case where the position of the battery cell 11 has shifted | deviated with respect to the housing | casing 70, the contact to the housing | casing 70 of the 2nd heat exchanger plate 121 can be maintained. Furthermore, since the unevenness 127 is formed in the fourth main body 125, the contact area with the TIM 75 can be widened, and efficient heat dissipation can be achieved. Furthermore, the uneven shape of the fourth main body 125 allows the TIM 75 affixed to the housing 70 to be engaged, so that a battery pack resistant to vibration can be formed.

  Moreover, since the unevenness 127 in the fourth main body 125 is formed by the amplitude of the member forming the fourth main body 125, the unevenness 127 can be easily formed.

[Third Embodiment]
Next, the battery module 201 according to the third embodiment will be described. The battery module 201 of the third embodiment is different from the battery module 1 of the first embodiment because the first heat transfer plate 21 of the first embodiment and the second heat transfer plate 121 of the second embodiment are mixed. It is a point that is arranged.

  For example, the 1st heat transfer plate 21 is arrange | positioned as a heat transfer plate which contacts the battery cell 11 arrange | positioned at the both ends of the array 30, and the heat transfer plate which contacts the battery cell 11 arrange | positioned other than the both ends of the array 30 As a second heat transfer plate 121 may be disposed. In this case, the crossing angle α in the first heat transfer plate 21 may be 90 degrees or larger than 90 degrees.

  Even with the battery module 201 having this configuration, the operational effects of the battery module 101 of the second embodiment can be obtained.

  Although one embodiment has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

<First Modification>
In the battery module 101 of the second embodiment, the example in which the intersection angle α1 of the third main body portion 123 and the fourth main body portion 125 in all the second heat transfer plates is the same has been described. However, the present invention is not limited to this. In the battery module 101A according to the first modification, the crossing angle α1 between the third main body portion 123 and the fourth main body portion 125 shown in FIG. 6 is the arrangement direction D as in the battery module 1 according to the first embodiment. The second heat transfer plate 121 that contacts the battery cell 11 located at the center of the array 30 may be formed to be larger. In addition, the amplitude A of the 4th main-body part 125 in all the 2nd heat exchanger plates 121 is constant.

  The battery module 101A having this configuration has the following functions and effects in addition to the functions and effects of the battery module 101 of the second embodiment. That is, in the battery module 101 </ b> A, the intersection angle α <b> 1 between the third main body portion 123 and the fourth main body portion 125 is larger as the second heat transfer plate 121 located at the center of the array body 30. The amount of protrusion of the fourth main body 125 from the side surface 17 of the battery cell 11 increases as the second heat transfer plate 121 performs. Therefore, when the battery module 1 is attached to the housing 70, the second heat transfer plate 121 located at the center of the array 30 is pressed. In other words, the second heat transfer plate 121 located at the center of the array 30 has a greater bending reaction force and a greater force to contact the housing 70. As a result, the battery cell 11 located at the center of the array 30 maintains the contact of the second heat transfer plate 121 to the casing 70 even in the battery module 101A that tends to shift away from the casing 70. can do.

  Note that the battery module 201 of the third embodiment can be modified similarly to the first modification.

<Second Modification>
In the battery module 101 of the second embodiment, the example in which all the amplitudes (unevenness) A of the fourth main body 125 in all the second heat transfer plates is the same has been described, but the present invention is limited to this. Not. In the battery module 101B according to the second modified example, the amplitude (unevenness) A shown in FIG. 6 is larger as the second heat transfer plate 121 contacting the battery cell 11 located at the center of the array 30 in the array direction D. It may be formed as follows. Note that the intersection angle α <b> 1 between the third main body portion 123 and the fourth main body portion 125 is the same among all the second heat transfer plates 121.

  The battery module 101B having this configuration has the following operational effects in addition to the operational effects of the battery module 101 of the second embodiment. That is, in the battery module 101B, the second heat transfer plate 121 located at the center of the array body 30 has a larger amplitude (unevenness) A with the fourth main body 125 than the second heat transfer plate 121 located at the center of the array body 30. The amount of protrusion of the fourth main body 125 from the side surface 17 of the battery cell 11 increases as the heat transfer plate 121 increases. Therefore, when the battery module 1 is attached to the housing 70, the second heat transfer plate 121 located at the center of the array 30 is pressed. In other words, the second heat transfer plate 121 located at the center of the array 30 has a greater bending reaction force and a greater force to contact the housing 70. As a result, the battery cell 11 positioned at the center of the array 30 maintains the contact of the second heat transfer plate 121 to the casing 70 even in the battery module 101B that tends to shift away from the casing 70. can do.

  Note that the battery module 201 of the third embodiment can be modified in the same manner as the second modification.

<Third Modification>
In the battery module 101 </ b> B of the second modified example, the intersection angle α <b> 1 between the third main body portion 123 and the fourth main body portion 125 has been described with an example in which all of the second heat transfer plates 121 are the same. However, the present invention is not limited to this. In the battery module 101C according to the third modification, the amplitude (unevenness amount) A shown in FIG. 6 is larger as the second heat transfer plate 121 contacting the battery cell 11 positioned at the center of the array 30 in the array direction D. The crossing angle α1 between the third main body 123 and the fourth main body 125 shown in FIG. 6 is in contact with the battery cell 11 positioned at the center of the array 30 in the array direction D. Two heat transfer plates 121 may be formed to be larger.

  The battery module 101C having this configuration has both the operational effects of the battery module 101A having the configuration of the second modification and the battery module 101B having the configuration of the third modification.

  Note that the battery module 201 of the third embodiment can be modified in the same manner as in the third modification.

<Fourth Modification>
The fourth main body 125 in the battery modules 101, 201, 101A, 101B, 101C of the second embodiment, the third embodiment, the first modification, the second modification, and the third modification is the fourth main body 125. Although an example in which the unevenness 127 is formed by the amplitude of the member is described, the present invention is not limited to this. For example, as shown in FIG. 7, the fourth main body portion 125 </ b> A may be configured such that the unevenness 127 </ b> A is formed by arranging a convex portion only on one side (the housing 70 side).

  The battery module having this configuration has the same operation as each of the battery modules 101, 201, 101A, 101B, and 101C of the second embodiment, the third embodiment, the first modification, the second modification, and the third modification. Has an effect. Further, in the battery module having this configuration, the battery cell 11 may be arranged in a state of being held by the resin battery holder, but the protruding portion does not protrude toward the battery cell 11 side. Damage can be suppressed.

<Fifth Modification>
The fourth main body 125 in the battery modules 101, 201, 101A, 101B, 101C of the second embodiment, the third embodiment, the first modification, the second modification, and the third modification is the fourth main body 125. Although an example in which the unevenness 127 is formed by the amplitude of the member is described, the present invention is not limited to this. For example, as shown in FIG. 8A and FIG. 8B, the fourth main body portion 125B has a convex portion 126 that is convex only on one side (the housing 70 side) so that the irregularities 127B are formed. It may be formed. Such 4th main-body part 125B can be formed by press molding, for example.

  The battery module having this configuration has the same operation as each of the battery modules 101, 201, 101A, 101B, and 101C of the second embodiment, the third embodiment, the first modification, the second modification, and the third modification. Has an effect. Further, in the battery module having this configuration, the battery cell 11 may be arranged in a state of being held by the resin battery holder, but the protruding portion does not protrude toward the battery cell 11 side. Damage can be suppressed.

<Sixth Modification>
Instead of all or a part of the first heat transfer plate 21 of the battery module 201 of the third embodiment, a first heat transfer having a second main body 235 formed in an arc shape as shown in FIG. 9. A plate 321 may be arranged. The first heat transfer plate 221 according to the sixth modification is different from the first heat transfer plate 21 of the third embodiment from the side surface 17 intersecting the main surface 16 of the battery cell 11 to the facing surface of the second main body 325. The distance L to 325 a is a point that is longer as the distance L is located at the center of the battery cell 11 in the arrangement direction D of the battery cells 11.

  Usually, the case 12 of the battery cell 22 has lower rigidity toward the center in the thickness direction (arrangement direction D), and higher rigidity toward the end (case ridge). Therefore, the expansion amount of the battery cell 22 is larger toward the center in the thickness direction, and is smaller toward the end (case ridge). In the first heat transfer plate 321 having this configuration, the distance L from the side surface 17 of the battery cell 22 is shorter as the expansion amount of one battery cell 22 is smaller, and the distance L from the side surface 17 of the battery cell 22 is larger as the expansion amount is larger. Since the distance L becomes long, it is possible to easily follow the expansion of the battery cell 11.

<Seventh Modification>
Instead of all or a part of the first heat transfer plate 21 of the battery module 1 of the first embodiment, a first heat transfer having a second main body 235 formed in an arc shape as shown in FIG. A plate 321 may be arranged. The first heat transfer plate 321 according to the seventh modification is different from the first heat transfer plate 21 of the first embodiment from the side surface 17 intersecting the main surface 16 of the battery cell 11 to the facing surface of the second main body 325. The distance L to 325 a is a point that is longer as the distance L is located at the center of the battery cell 11 in the arrangement direction D of the battery cells 11. In the first heat transfer plate 321 having this configuration, the distance L from the side surface 17 of the battery cell 22 is shorter as the expansion amount of one battery cell 22 is smaller, and the distance L from the side surface 17 of the battery cell 22 is larger as the expansion amount is larger. Since the distance L becomes long, it is possible to easily follow the expansion of the battery cell 11.

<Eighth Modification>
Instead of all or part of the second heat transfer plate 121 of the battery module 101 of the second embodiment, a second heat transfer plate having a fourth main body 425 formed in a wave shape as shown in FIG. 421 may be arranged. The second heat transfer plate 421 according to the eighth modification is different from the second heat transfer plate 121 of the second embodiment because the amplitude A3 in the fourth main body 425 is the battery cell 11 in the arrangement direction D of the battery cells 11. The smaller the point is in the center of In the second heat transfer plate 421 having this configuration, the amplitude A3 is larger as the expansion amount is smaller in one battery cell 22, and the amplitude A3 is smaller as the expansion amount is larger. Therefore, the expansion of the battery cell 11 is easily followed. be able to.

<Ninth Modification>
As shown in FIG. 11, all or part of the first heat transfer plate 21 of the first embodiment and the second main body portion 25 of all or part of the first heat transfer plate 21 of the third embodiment are as shown in FIG. 11. The second main body 525 may be bent so that a parallel portion 525a parallel to the arrangement direction D is formed. In the first heat transfer plate 521 having such a configuration, since the parallel portion 525a parallel to the arrangement direction D is formed in the second main body portion 525, it is possible to make surface contact with the housing 70. This enables efficient heat transfer and improves heat dissipation. Similarly, the second main body 325 of the first heat transfer plate 321 of the sixth modification and the seventh modification may be bent so as to form a parallel part parallel to the arrangement direction. .

<10th modification>
In the battery module 201 of the third embodiment, an example in which the first heat transfer plate 21 is disposed as a heat transfer plate that contacts the battery cells 11 disposed at both ends of the array 30 is given. Although the example which made the crossing angle (alpha) of the 1st main-body part 23 and the 2nd main-body part 25 in the heat-transfer plate 21 the same was demonstrated, this invention is not limited to this. For example, when the first heat transfer plate 21 is disposed as a heat transfer plate that contacts all or part of the battery cells 11 disposed at both ends other than the both ends of the array 30, the first main body 23 and the second main body 23 are disposed. As in the battery module 1 according to the first embodiment, the crossing angle α with the portion 25 increases as the first heat transfer plate 21 comes into contact with the battery cell 11 located at the center of the array 30 in the array direction D. It may be formed.

<Other variations>
In the eighth modification, the amplitude A3 in the fourth main body portion 425 may be increased as it is located at the center of the battery cell 11 in the arrangement direction D of the battery cells 11.

  The present invention may be appropriately combined with the first to third embodiments and the first to tenth modified examples without departing from the spirit of the invention.

  DESCRIPTION OF SYMBOLS 1,101,201,101A, 101B, 101C ... Battery module, 11 (11A-11I) ... Battery cell, 16 ... Main surface, 17 ... Side surface, 21 (21A-21I), 321, 521 ... First heat transfer plate , 23 ... 1st main body part, 25, 325, 525 ... 2nd main body part, 30 ... Array, 70 ... Housing, 121, 421 ... 2nd heat transfer plate, 123 ... 3rd main body part, 125, 125A, 125B, 425 ... 4th main-body part, 126 ... Convex part, 127, 127A, 127B ... Concavity and convexity, 525a ... Parallel part, D ... Arrangement direction.

Claims (15)

A battery module attached to a housing,
A plurality of battery cells arranged in one direction;
A plurality of first heat transfer plates arranged to come into contact with a main surface that is a surface intersecting with the direction of the arrangement of the battery cells,
The first heat transfer plate is
A first main body contacting the main surface;
A second body part that bends in a direction intersecting the main surface from one end side of the first body part and contacts the housing;
The crossing angle between the first main body and the second main body is a battery module that is larger as the first heat transfer plate is in contact with the battery cell located at the center of the array in the direction of the array.   The battery module according to claim 1, wherein the second main body portion is bent so that a parallel portion parallel to the arrangement direction is formed. A battery module attached to a housing,
A plurality of battery cells arranged in one direction;
A plurality of heat transfer plates arranged so as to contact a main surface that is a surface intersecting the direction of the arrangement of the battery cells,
The heat transfer plate is a mixture of two types of first heat transfer plate and second heat transfer plate having different shapes,
The first heat transfer plate is
A first main body contacting the main surface;
A second body part that bends in a direction intersecting the main surface from one end side of the first body part and contacts the housing;
The second heat transfer plate is
A third body portion that contacts the main surface;
A fourth body part that bends in a direction intersecting the main surface from one end side of the third body part and contacts the housing;
A battery module, wherein the fourth main body is provided with irregularities.   The battery module according to claim 3, wherein the second main body portion is bent so that a parallel portion parallel to the arrangement direction is formed.   5. The crossing angle between the first main body portion and the second main body portion is larger as the first heat transfer plate is in contact with the battery cell located at the center of the array in the direction of the array. The battery module as described. A battery module attached to a housing,
A plurality of battery cells arranged in one direction;
A plurality of second heat transfer plates arranged so as to contact a main surface that is a surface intersecting the direction of the arrangement of the battery cells,
The second heat transfer plate is
A third body portion that contacts the main surface;
A fourth body part that bends in a direction intersecting the main surface from one end side of the third body part and contacts the housing;
A battery module, wherein the fourth main body is provided with irregularities.   The battery module according to any one of claims 3 to 6, wherein a convex portion of the unevenness in the fourth main body is formed only on a surface to be brought into contact with the housing.   The battery module according to claim 3, wherein the unevenness is formed by an amplitude of a member forming the fourth main body portion.   9. The battery module according to claim 3, wherein an amount of the unevenness in the fourth main body is larger as the second heat transfer plate is in contact with the battery cell located at the center of the array.   The crossing angle between the third main body portion and the fourth main body portion is larger as the second heat transfer plate is in contact with the battery cell located at the center of the array body in the array direction. The battery module according to any one of the above.   In the first heat transfer plate, a distance from a side surface intersecting a main surface of the battery cell to the second main body is longer as it is positioned at the center of the battery cell in the arrangement direction of the battery cells. The battery module as described in any one of 3-5.   12. The battery module according to claim 3, wherein, in the second heat transfer plate, an amplitude in the fourth main body portion is smaller as it is located at the center of the battery cell in the arrangement direction of the battery cells. . A battery module attached to a housing,
A plurality of battery cells arranged in one direction;
A plurality of first heat transfer plates arranged to come into contact with a main surface that is a surface intersecting with the direction of the arrangement of the battery cells,
The first heat transfer plate is
A first main body contacting the main surface;
A second body part that bends in a direction intersecting the main surface from one end side of the first body part and contacts the housing;
In the first heat transfer plate, the distance from the side surface intersecting the main surface of the battery cell to the second main body is longer as the distance from the side of the battery cell in the arrangement direction of the battery cell is longer. .   The battery module according to claim 13, wherein the second main body portion is bent so as to form a parallel portion parallel to the arrangement direction.   The crossing angle between the first main body portion and the second main body portion is larger as the first heat transfer plate is in contact with the battery cell located at the center of the array in the direction of the array. The battery module as described.

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