JP6496934B2 - Battery module - Google Patents

Description

  The present invention relates to a battery module mounted on an electric vehicle or the like.

  In general, an appropriate environmental temperature is set for the battery. When the battery is used in a high temperature environment or a low temperature environment outside the appropriate environmental temperature, the performance of the battery may be deteriorated. For example, in an electric vehicle such as an electric vehicle or a hybrid vehicle, a temperature sensor is installed in a battery for storing electricity supplied to a drive motor, and the temperature of the battery is detected by this temperature sensor. Yes.

JP 2013-30375 A

  As a technique for detecting the temperature of a battery mounted on an electric vehicle or the like in this way, for example, there is one described in Patent Document 1. The technique described in Patent Document 1 detects the environmental temperature in the battery pack with one temperature sensor and controls the battery pack to the optimum temperature.

  However, with the technique described in Patent Document 1, it is not possible to detect a temperature abnormality when an abnormality occurs in the battery cell. In an electric vehicle, when a temperature abnormality occurs in a battery cell, control such as prohibiting the use of the battery cell is performed in order to prevent further abnormality.

  Therefore, even in the technique described in Patent Document 1, it is necessary to provide a temperature sensor for each battery cell in order to detect temperature abnormality of individual battery cells in the battery pack. Thus, providing a temperature sensor for each battery cell leads to an increase in the number of parts and an increase in manufacturing cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the number of temperature sensors that detect temperature abnormalities of battery cells.

  A battery module according to a first invention for solving the above-described problems is a plurality of battery cells, a heat transfer means connected to the plurality of battery cells, and detects the temperature of the battery cell via the heat transfer means. In the battery module including the temperature detection means, the heat transfer means includes a plurality of heat transfer portions that respectively transmit thermal energy of the plurality of battery cells to the temperature detection means, and a plurality of the heat transfer The unit is characterized in that the heat transfer efficiency differs depending on the distance between the battery cell and the temperature detection means.

  A battery module according to a second invention for solving the above-mentioned problems is the battery module according to the first invention, wherein the heat transfer means includes a heat transfer member having a flat plate shape, and a plurality of the heat transfer members. The portion is formed by different cross-sectional areas of the heat transfer member.

  A battery module according to a third invention for solving the above-mentioned problems is the battery module according to the second invention, wherein a plurality of the heat transfer parts are formed with different widths or thicknesses of the heat transfer members. It is characterized by.

  A battery module according to a fourth invention for solving the above-mentioned problems is characterized in that, in the battery module according to the second invention, a plurality of the heat transfer sections are branched into a plurality.

  A battery module according to a fifth invention for solving the above-mentioned problems is the battery module according to any one of the second to fourth inventions, wherein the temperature detecting means is provided at a substantially central portion of the heat transfer member. It is a sensor, The said several heat-transfer part consists of a point-symmetric form centering | focusing on the said temperature sensor, It is characterized by the above-mentioned.

  A battery module according to a sixth invention for solving the above-mentioned problems is the battery module according to the fifth invention, wherein the plurality of battery cells are arranged in one direction, and the heat transfer member is The battery cell has a rectangular shape extending in the arrangement direction, the heat transfer section is a rectangular shape extending from the temperature sensor to the battery cell, and the distance between the battery cell and the temperature sensor is equal. The heat transfer section is formed to extend from the temperature sensor to the opposite side in the battery cell arrangement direction, and is arranged to be shifted in a direction intersecting the battery cell arrangement direction. It is characterized by.

A battery module according to a seventh invention for solving the above-mentioned problems is a battery module according to any one of the second to fourth inventions, wherein a plurality of the battery cells are arranged in one direction. The temperature detection means is a temperature sensor provided at a substantially central portion of the heat transfer member, and the plurality of heat transfer portions extend in a direction orthogonal to the arrangement direction of the plurality of battery cells through the temperature sensor. It is characterized by comprising a line-symmetric form symmetric with respect to the line.

Battery module according to an eighth invention for solving the problems is the battery module according to a seventh invention, before Kiden'netsu member is comprised of a rectangular shape extending in the arrangement direction of the battery cell, the heat transfer portion The heat transfer portion having a rectangular shape extending from the temperature sensor to the battery cell, the distance between the battery cell and the temperature sensor being equal to each other in the arrangement direction of the battery cell from the temperature sensor. It is formed to extend to the side, and is arranged in the same position in a direction crossing the arrangement direction of the battery cells.

  A battery module according to a ninth invention for solving the above-mentioned problems is the battery module according to any one of the second to eighth inventions, wherein a plurality of the heat transfer sections are provided between the battery cell and the temperature detection means. The contact area with the battery cell is made different depending on the distance.

  A battery module according to a tenth invention for solving the above-mentioned problems is characterized in that, in the battery module according to any one of the second to ninth inventions, the heat transfer section is coated. .

  According to the battery module according to the first invention, the temperature detection accuracy of each battery cell is made equivalent by making the heat transfer efficiency in the heat transfer section different according to the distance between the battery cell and the temperature detecting means. be able to.

  According to the battery module which concerns on 2nd invention, the heat-transfer part from which heat-transfer efficiency differs with a simple structure can be provided.

  According to the battery module according to the third aspect of the present invention, it is possible to provide heat transfer portions with different heat transfer efficiency with a simple configuration.

  According to the battery module which concerns on 4th invention, the heat-transfer part from which heat-transfer efficiency differs with a simple structure can be provided.

  According to the battery module according to the fifth aspect of the present invention, it is possible to suppress erroneous assembly of the heat transfer member during manufacture of the battery module.

  According to the battery module of the sixth aspect of the invention, it is possible to provide heat transfer portions with different heat transfer efficiencies with a simple configuration, and it is possible to suppress erroneous assembly of the heat transfer members during manufacturing of the battery module.

  According to the battery module according to the seventh aspect of the present invention, it is possible to suppress erroneous assembly of the heat transfer member during manufacture of the battery module.

  According to the battery module according to the eighth aspect of the invention, it is possible to provide the heat transfer parts having different heat transfer efficiencies with a simple configuration, and it is possible to suppress erroneous assembly of the heat transfer members during manufacturing of the battery module.

  According to the battery module according to the ninth aspect of the invention, the heat transfer efficiency in the heat transfer section can be improved, and the temperature detection accuracy of each battery cell can be made more equivalent.

  According to the battery module of the tenth invention, the heat transfer efficiency in the heat transfer section can be improved, and the temperature detection accuracy of each battery cell can be made more equivalent.

1 is a plan view showing a structure of a battery module according to Example 1. FIG. It is sectional drawing (II-II arrow sectional drawing in FIG. 1) which shows the structure of the battery module which concerns on Example 1. FIG. 6 is a plan view showing a structure of a battery module according to Example 2. FIG. 6 is a plan view showing a structure of a battery module according to Example 3. FIG. 6 is a plan view showing a structure of a battery module according to Example 4. FIG. It is sectional drawing (VI-VI arrow sectional drawing in FIG. 5) which shows the structure of the battery module which concerns on Example 4. FIG.

  Hereinafter, embodiments of a battery module according to the present invention will be described in detail with reference to the accompanying drawings. Needless to say, the present invention is not limited to the following examples, and various modifications can be made without departing from the spirit of the present invention.

[Example 1]
A battery module according to Example 1 of the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the battery module 1 includes a battery module case 10, a plurality (four in FIG. 1) of battery cells 21, 22, 23, 24 installed in the battery module case 10, The battery module case 10 is provided with a bus bar 30 that electrically connects adjacent battery cells 21 to 24.

  The battery cells 21 to 24 are respectively provided with a positive electrode terminal 40 and a negative electrode terminal 41, and the positive electrode terminal 40 and the negative electrode terminal 41 of the adjacent battery cells 21 to 24 are connected by the bus bar 30. Note that one of the positive terminals 40 and the negative terminals 41 of the plurality of battery cells 21 to 24 in the battery module 1 (in FIG. 1, the upper left positive terminal 40 and the upper right negative terminal 41) This is an input / output terminal 42 for electrically connecting to the outside (another battery module or another electric device).

  As shown in FIG. 1 and FIG. 2, the battery module 1 is provided with insulating members 51, 52, 53, 54 having heat conductivity on the upper surfaces 21 a, 22 a, 23 a, 24 a of the battery cells 21 to 24, A flat plate-shaped heat transfer plate member 60 that connects these insulating members 51 to 54 is provided. That is, the heat transfer plate member 60 has a substantially rectangular shape extending in the arrangement direction (the left-right direction in FIG. 1) of the plurality of battery cells 21 to 24, and the plurality of battery cells 21 via the insulating members 51 to 54. ˜24 are connected to each other.

  The heat transfer plate member 60 is provided with a temperature sensor 70 located substantially at the center of the heat transfer plate member 60, and the thermal energy of the battery cells 21 to 24 in the battery module 1 is changed to the respective insulating members 51 to 51. 54 and the heat transfer plate member 60 are transmitted to the temperature sensor 70. That is, the battery temperature (temperature abnormality) in each of the battery cells 21 to 24 is detected by the temperature sensor 70.

  The heat transfer plate member 60 has first end portions 62 a and 63 a in contact with the insulating members 52 and 53 provided on the upper surfaces 22 a and 23 a of the battery cells 22 and 23 positioned close to the temperature sensor 70. 62, 63 and second heat transfer portions 61, 64 that contact the insulating members 51, 54 provided on the upper surfaces 21a, 24a of the battery cells 21, 24, the end portions 61a, 64a of which are spaced apart from the temperature sensor 70. And are provided.

  One first heat transfer portion 62 and one second heat transfer portion 61 are substantially at the center of the heat transfer plate member 60, that is, on one side in the arrangement direction of battery cells 21 to 24 (the left-right direction in FIG. 1) from the temperature sensor 70. The other first heat transfer portion 63 and the other second heat transfer portion 64 are formed at the approximate center of the heat transfer plate member 60, that is, the temperature. It is formed in a shape (rectangular shape) extending from the sensor 70 to the other side (the right side in FIG. 1) in the arrangement direction of the battery cells 21 to 24.

  Moreover, the 1st heat-transfer parts 62 and 63 extended from the temperature sensor 70 to the both sides (reciprocal side) in the sequence direction of the battery cells 21-24 are respectively the width directions (array of the battery cells 21-24) of the heat-transfer plate member 60. It is a direction that intersects the direction and is shifted (differently) in the vertical direction in FIG. 1, and is provided on both sides (opposite sides) in the arrangement direction of the battery cells 21 to 24 from the temperature sensor 70. The extending second heat transfer portions 61 and 64 are provided with their positions shifted in the width direction of the heat transfer plate member 60. That is, in the heat transfer plate member 60, the first heat transfer parts 62 and 63 and the second heat transfer parts 61 and 64 are arranged at point-symmetric positions with the temperature sensor 70 as the center.

  As described above, the heat transfer plate member 60 has a point-symmetric configuration with the temperature sensor 70 as the center, so that the heat transfer plate member 60 extends over the battery cells 21 to 24 even if the heat transfer plate member 60 is rotated halfway (180 ° rotation). Can be provided. That is, it is possible to prevent misassembly during the manufacture of the battery module 1.

  In the battery module 1, the heat energy of the battery cells 22 and 23 located in the vicinity of the temperature sensor 70 is transmitted to the temperature sensor 70 by the first heat transfer units 62 and 63, and is transmitted by the second heat transfer units 61 and 64. The thermal energy of the battery cells 21, 24 positioned away from the temperature sensor 70 is transmitted to the temperature sensor 70.

The first heat transfer portions 62 and 63 and the second heat transfer portions 61 and 64 in the heat transfer plate member 60 are distances for transmitting heat energy (the first heat transfer portions 62 and 63 and the second heat transfer portions 61 and 64. Lengths L ₆₁ , L ₆₂ , L ₆₃ , L ₆₄ ), that is, the distances between the battery cells 21 to 24 (insulating members 51 to 54) and the temperature sensor 70 are different, and the widths B ₆₁ and B ₆₂ are different. , B ₆₃ and B ₆₄ are different.

Specifically, the first heat transfer parts 62 and ₆₃ have short lengths (length in the left-right direction in FIG. 1) L ₆₂ and L ₆₃ and width (length in the vertical direction in FIG. 1) B ₆₂ , B ₆₃ is narrow, and the second heat transfer portions ₆₁ and ₆₄ have long lengths (length in the left-right direction in FIG. 1) L ₆₁ and L ₆₄ and width (length in the vertical direction in FIG. 1). B ₆₁ and B ₆₄ are wide.

For example, when the lengths L ₆₁ and L _{64 of} the second heat transfer parts ₆₁ and ₆₄ are substantially twice the lengths L ₆₂ and L ₆₃ of the first heat transfer parts ₆₂ and ₆₃ , the second heat transfer part The widths B ₆₁ and B ₆₄ of ₆₁ and ₆₄ are set to be twice or more than the widths B ₆₂ and B ₆₃ of the first heat transfer parts ₆₂ and ₆₃ .

In this way, the second heat transfer portions 61 and 64 having a long distance for transmitting heat energy are wider than the first heat transfer portions 62 and 63 having a short distance for transferring heat energy (B ₆₁ , B ₆₄ > B ₆₂ , B ₆₃ ), the sectional areas S ₆₁ and S ₆₄ of the second heat transfer parts ₆₁ and ₆₄ are made larger than the sectional areas S ₆₂ and S ₆₃ of the first heat transfer parts ₆₂ and ₆₃ ( _{S 61, S 64> S 62} , S 63), the heat transfer efficiency of the second heat exchanger unit 61, 64 can be made higher than the heat transfer efficiency of the first heat exchanger unit 62, 63 (see FIG. 2).

Moreover, as shown in FIG. 1, the insulating members 51 to 54 for transmitting the thermal energy of the battery cells 21 to 24 to the heat transfer plate member 60 are distances between the battery cells 21 to 24 and the temperature sensor 70 (for example, The areas S ₅₁ , S ₅₂ , S ₅₃ , and S ₅₄ are made different according to the lengths L _{61 to} L _{64 of} the first heat transfer parts 62 and 63 and the second heat transfer parts 61 and ₆₄ . That is, the areas S ₅₁ and S ₅₄ of the insulating members ₅₁ and ₅₄ for transmitting the thermal energy of the battery cells 21 and 24 positioned away from the temperature sensor 70 to the heat transfer plate member 60 are close to the temperature sensor 70. Compared to the areas S ₅₂ , S ₅₃ of the insulating members 52, 53 for transmitting the thermal energy of the battery cells 22, 23 positioned to the heat transfer plate member 60, the distance (the first heat transfer parts 62, 63 of those as large in proportion to the length L _62, L ₆₃ length of the second heat transfer unit 61,64 L _61, L _64).

Thus, it contacts with the 2nd heat-transfer parts 61 and 64 with long distance which transmits a thermal energy with respect to the insulating members 52 and 53 which contact the 1st heat-transfer parts 62 and 63 with a short distance which transmits heat energy. By forming the insulating members ₅₁ and ₅₄ to be large (S ₅₁ , S ₅₄ > S ₅₂ , S ₅₃ ), the heat transfer efficiency of the second heat transfer parts 61 and 64 is higher than the heat transfer efficiency of the first heat transfer parts 62 and 63. Can also be high.

That is, the first heat transfer units 62 and 63 and the second heat transfer units 61 and 64 are in accordance with their lengths (L _{61 to} L ₆₄ ), that is, the distance between the battery cells 21 to 24 and the temperature sensor 70. The difference in heat transfer efficiency results in a difference in the thermal energy transmitted from the battery cells 21 to 24 to the temperature sensor 70, so the battery cell 22 detected via the first heat transfer units 62 and 63. , 23 and the temperature accuracy of the battery cells 21, 24 detected via the second heat transfer parts 61, 64 can be made equivalent.

  The temperature detecting means in the present invention is not limited to the one provided in the approximate center of the heat transfer plate member 60 as in the temperature sensor 70 in the present embodiment. For example, the longitudinal direction in the heat transfer plate member 60 (left and right in FIG. 1) It may be provided at a position offset to one side of (direction). As described above, even when the temperature sensor 70 is provided at one side of the heat transfer plate member 60, the heat transfer efficiency of the heat transfer units 61 to 64 is made different according to the distance from the temperature sensor 70. Thus, the same operations and effects as in the present embodiment can be achieved.

  Moreover, the 1st heat-transfer parts 62 and 63 are provided by coating the heat-transfer plate member 60, ie, the 1st heat-transfer parts 62 and 63, and the 2nd heat-transfer parts 61 and 64 using the material with high heat insulation. And since the heat transfer efficiency of the 2nd heat transfer parts 61 and 64 can be improved, the battery temperature of the battery cells 21-24 can be detected more accurately.

[Example 2]
A battery module according to Example 2 of the present invention will be described with reference to FIG.

  The battery module 101 according to the present embodiment includes a battery module case 10, a plurality (four in FIG. 3) of battery cells 21, 22, 23, and 24 installed in the battery module case 10, and a battery module case. 10 are electrically connected to adjacent battery cells 21 to 24, and insulating members 51, 52, 53 provided on the upper surfaces 21a, 22a, 23a, and 24a of the battery cells 21 to 24 and having heat conductivity. 54, a flat plate-shaped heat transfer plate member 160 that connects the insulating members 51 to 54, and a temperature sensor 70 that is provided substantially at the center of the heat transfer plate member 160. Except for the shape, the battery module 1 has the same structure as that of the battery module 1 according to Example 1. Therefore, the overlapping description with respect to the structure similar to Example 1 in the battery module 101 which concerns on a present Example is abbreviate | omitted suitably.

  The heat transfer plate member 160 has first ends 162 a and 163 a in contact with insulating members 52 and 53 provided on the upper surfaces 22 a and 23 a of the battery cells 22 and 23 positioned close to the temperature sensor 70. 162, 163, and second heat transfer portions 161, 164 in contact with the insulating members 51, 54 provided on the upper surfaces 21a, 24a of the battery cells 21, 24 whose end portions 161a, 164a are spaced apart from the temperature sensor 70. And are provided.

  One first heat transfer portion 162 and one second heat transfer portion 161 are substantially at the center of the heat transfer plate member 160, that is, on one side in the arrangement direction of battery cells 21 to 24 (the left-right direction in FIG. 3) from the temperature sensor 70. The other first heat transfer section 163 and the other second heat transfer section 164 are substantially in the center of the heat transfer plate member 160, that is, the temperature. It is formed in a shape (rectangular shape) extending from the sensor 70 to the other side (the right side in FIG. 3) in the arrangement direction of the battery cells 21 to 24.

  The first heat transfer portions 162 and 163 extending from the temperature sensor 70 to both sides (reciprocal sides) in the arrangement direction of the battery cells 21 to 24 are respectively in the width direction of the heat transfer plate member 160 (the arrangement of the battery cells 21 to 24). The second transmission is provided at the same position in the direction intersecting the direction and in the vertical direction in FIG. 3, and extends from the temperature sensor 70 to both sides (opposite sides) in the arrangement direction of the battery cells 21 to 24. The heat parts 161 and 164 are provided in the same position in the width direction of the heat transfer plate member 160. That is, in the heat transfer plate member 160, the first heat transfer units 162 and 163 and the second heat transfer units 161 and 164 are arranged at positions that are line-symmetric with respect to the temperature sensor 70.

  As described above, the heat transfer plate member 160 forms a line symmetry with the temperature sensor 70 as the center, so that the heat transfer plate member 160 can be provided over the battery cells 21 to 24 even if the heat transfer plate member 160 is turned upside down. That is, it is possible to prevent misassembly during manufacture of the battery module 101.

  In the battery module 101, the thermal energy of the battery cells 22 and 23 positioned in proximity to the temperature sensor 70 is transmitted to the temperature sensor 70 by the first heat transfer units 162 and 163, and the second heat transfer units 161 and 164 The thermal energy of the battery cells 21, 24 positioned away from the temperature sensor 70 is transmitted to the temperature sensor 70.

The first heat transfer portions 162 and 163 and the second heat transfer portions 161 and 164 in the heat transfer plate member 160 are distances that transmit thermal energy, that is, the battery cells 21 to 24 (insulating members 51 to 54) and the temperature sensor. The distances B and B ₁₆₁ , B ₁₆₂ , B ₁₆₃ , and B ₁₆₄ are made different from each other with the distance from the 70.

Specifically, the first heat transfer sections 162 and ₁₆₃ have short lengths L ₁₆₂ and L _{163 in} FIG. 3 and short widths (lengths in the vertical direction in FIG. 3) B ₁₆₂ , B ₁₆₃ is narrow, and the second heat transfer portions ₁₆₁ and ₁₆₄ have long lengths (lengths in the left-right direction in FIG. 3) L ₁₆₁ and L ₁₆₄ and widths (lengths in the vertical direction in FIG. 3). B ₁₆₁ and B ₁₆₄ are wide.

  With the above configuration, the battery module 101 exhibits the same operations and effects as the battery module 1 according to the first embodiment.

[Example 3]
The structure of the battery module according to Example 3 of the present invention will be described with reference to FIG.

  The battery module 201 according to this embodiment includes a battery module case 10, a plurality (four in FIG. 4) of battery cells 21, 22, 23, and 24 installed in the battery module case 10, and a battery module case. 10, a bus bar 30 that electrically connects adjacent battery cells 21 to 24, insulating members 51, 52, 53, and 54 having heat transfer properties, and a plate-shaped heat transfer plate member 260 that connects the insulating members 51 to 54. And a temperature sensor 70 provided substantially at the center of the heat transfer plate member 260, except for the shape of the heat transfer plate member 260, the battery module 1 according to the first embodiment of the present invention, and It has the same structure. Therefore, the overlapping description with respect to the structure similar to Example 1 in the battery module 201 which concerns on a present Example is abbreviate | omitted suitably.

  The heat transfer plate member 260 includes first end portions 262 a and 263 a that are in contact with insulating members 52 and 53 provided on the upper surfaces 22 a and 23 a of the battery cells 22 and 23 that are positioned close to the temperature sensor 70. 262, 263, and second heat transfer portions 261, 264 in contact with the insulating members 51, 54 provided on the upper surfaces 21a, 24a of the battery cells 21, 24 where the end portions 261a, 264a are spaced apart from the temperature sensor 70. And are provided.

  The first heat transfer parts 262 and 263 have shapes extending from the approximate center of the heat transfer plate member 260, that is, from the temperature sensor 70 to both sides (opposite sides) in the arrangement direction (left and right direction in FIG. 4) of the battery cells 21 to 24. The second heat transfer portions 261 and 264 extend from substantially the center of the heat transfer plate member 260, that is, from the temperature sensor 70 to both sides (opposite sides) in the arrangement direction of the battery cells 21 to 24. In addition, in a shape branched from the width direction of the heat transfer plate member 260 (the direction intersecting the arrangement direction of the battery cells 21 to 24 and the vertical direction in FIG. 4) so as to surround the first heat transfer parts 262 and 263, respectively. Is formed.

  Further, the first heat transfer units 262 and 263 and the second heat transfer units 261 and 264 are provided in the same position in the width direction of the heat transfer plate member 260. That is, in the heat transfer plate member 260, the first heat transfer units 262 and 263 and the second heat transfer units 261 and 264 are arranged at point-symmetrical and line-symmetric positions with the temperature sensor 70 as the center.

  As described above, the heat transfer plate member 260 has a point-symmetrical and line-symmetric configuration with the temperature sensor 70 as the center, so that the battery cells 21 to 24 can be obtained even if the heat transfer plate member 260 is rotated halfway (180 °). The heat transfer plate member 260 can be provided over the battery cells 21 to 24 even if the heat transfer plate member 260 is turned upside down. That is, it is possible to prevent erroneous assembly at the time of manufacturing the battery module 201.

  In the battery module 201, the thermal energy of the battery cells 22 and 23 positioned in proximity to the temperature sensor 70 is transmitted to the temperature sensor 70 by the first heat transfer units 262 and 263, and is transmitted by the second heat transfer units 261 and 264. The thermal energy of the battery cells 21, 24 positioned away from the temperature sensor 70 is transmitted to the temperature sensor 70.

  The first heat transfer parts 262 and 263 and the second heat transfer parts 261 and 264 in the heat transfer plate member 260 are distances for transferring thermal energy, that is, battery cells 21 to 24 (insulating members 51 to 54) and a temperature sensor. The distance to 70 is made different, and the quantity (number of transmission paths) is made different.

Specifically, the first heat transfer units ₂₆₂ and ₂₆₃ have short lengths (length in the left-right direction in FIG. 4) L ₂₆₂ and L ₂₆₃ and widths (length in the vertical direction in FIG. 4) B ₂₆₂ , B ₂₆₃ transmission path are those having one, the second heat exchanger unit 261,264 has a length (lateral direction length in Fig. 4) L _261, L ₂₆₄ is long, and the vertical direction in the width (FIG. 4 Length) It has two transmission paths of B ₂₆₁ and B ₂₆₄ .

For example, when the lengths L ₂₆₁ and L _{264 of} the second heat transfer parts ₂₆₁ and ₂₆₄ are approximately twice the lengths L ₂₆₂ and L ₂₆₃ of the first heat transfer parts, the second heat transfer parts ₂₆₁ and ₂₆₄ are used. Are divided into two transmission paths so that the cross-sectional areas of the second heat transfer portions ₂₆₁ and ₂₆₄ having two widths B ₂₆₁ and B ₂₆₄ are changed to the first of widths B ₂₆₂ and B ₂₆₃ having one width. The cross-sectional area of the heat transfer parts 262 and 263 is twice or more than twice.

  With the above configuration, the battery module 201 has the same operations and effects as the battery module 1 according to the first embodiment.

[Example 4]
The structure of the battery module according to Example 4 of the present invention will be described with reference to FIGS.

  The battery module 301 according to this embodiment includes a battery module case 10, a plurality (four in FIG. 5) of battery cells 21, 22, 23, and 24 installed in the battery module case 10, and a battery module case. 10, a bus bar 30 that electrically connects adjacent battery cells 21 to 24, heat-insulating insulating members 51, 52, 53, and 54, and a plate-shaped heat transfer plate member 360 that connects the insulating members 51 to 54. And a temperature sensor 70 provided at substantially the center of the heat transfer plate member 360, except for the shape of the heat transfer plate member 360, the battery module 1 according to the first embodiment of the present invention, and It has the same structure. Therefore, the overlapping description with respect to the structure similar to Example 1 in the battery module 301 which concerns on a present Example is abbreviate | omitted suitably.

  The heat transfer plate member 360 has first end portions 362 a and 363 a in contact with insulating members 52 and 53 provided on the upper surfaces 22 a and 23 a of the battery cells 22 and 23 positioned close to the temperature sensor 70. 362 and 363, and second heat transfer portions 361 and 364 that contact the insulating members 51 and 54 provided on the upper surfaces 21a and 24a of the battery cells 21 and 24 whose end portions 361a and 364a are spaced apart from the temperature sensor 70. And are provided.

  One of the first heat transfer units 362 and one of the second heat transfer units 361 is one side of the center portion of the heat transfer plate member 360, that is, the temperature sensor 70 in the arrangement direction of the battery cells 21 to 24 (left and right direction in FIG. 5). The other first heat transfer portion 363 and the other second heat transfer portion 364 are formed at substantially the center of the heat transfer plate member 360, that is, the temperature. It is formed in a shape (rectangular shape) extending from the sensor 70 to the other side (the right side in FIG. 5) in the arrangement direction of the battery cells 21 to 24.

  In addition, the first heat transfer portions 362 and 363 extending from the temperature sensor 70 to both sides (opposite sides) in the arrangement direction of the battery cells 21 to 24 are respectively in the width direction of the heat transfer plate member 360 (the arrangement of the battery cells 21 to 24). The second heat transfer which is provided in the direction intersecting the direction and in the vertical direction in FIG. 5 and extending from the temperature sensor 70 to both sides (opposite sides) in the arrangement direction of the battery cells 21 to 24. The portions 361 and 364 are provided with their positions shifted in the width direction of the heat transfer plate member 360. That is, in the heat transfer plate member 360, the first heat transfer units 362 and 363 and the second heat transfer units 361 and 364 are disposed at point-symmetric positions with the temperature sensor 70 as the center.

  As described above, the heat transfer plate member 360 has a point-symmetrical shape with the temperature sensor 70 as the center, so that the heat transfer plate member 360 extends over the battery cells 21 to 24 even if the heat transfer plate member 360 is rotated halfway (180 ° rotation). Can be provided. That is, it is possible to prevent erroneous assembly during the manufacture of the battery module 301.

  In the battery module 301, the first heat transfer units 362 and 363 transmit the thermal energy of the battery cells 22 and 23 located close to the temperature sensor 70 to the temperature sensor 70, and the second heat transfer units 361 and 364 The thermal energy of the battery cells 21, 24 positioned away from the temperature sensor 70 is transmitted to the temperature sensor 70.

The first heat transfer portions 362 and 363 and the second heat transfer portions 361 and 364 in the heat transfer plate member 360 are distances at which heat energy is transmitted, that is, the battery cells 21 to 24 (insulating members 51 to 54) and the temperature sensor. The thicknesses t ₃₆₁ , t ₃₆₂ , t ₃₆₃ , and t ₃₆₄ are made different from each other while the distance from 70 is made different.

Specifically, the first heat transfer sections _{362 and 363} have short lengths (length in the left-right direction in FIG. 5) L _{362 and} L ₃₆₃ and thickness (length in the vertical direction in FIG. 6) t ₃₆₂ , t ₃₆₃ is thin, and the second heat transfer parts ₃₆₁ and ₃₆₄ have long lengths (lengths in the left-right direction in FIG. 5) L ₃₆₁ and L ₃₆₄ and thicknesses (lengths in the vertical direction in FIG. 6). t ₃₆₁ and t ₃₆₄ are thick.

For example, when the lengths L ₃₆₁ and L _{364 of} the second heat transfer units ₃₆₁ and ₃₆₄ are substantially twice the lengths L ₃₆₂ and L ₃₆₃ of the first heat transfer units ₃₆₂ and ₃₆₃ , the second heat transfer unit The thicknesses t ₃₆₁ and t ₃₆₄ of ₃₆₁ and ₃₆₄ are set to be twice or more than the thicknesses t ₃₆₂ and t ₃₆₃ of the first heat transfer parts ₃₆₂ and ₃₆₃ .

  With the above configuration, the battery module 301 has the same operations and effects as the battery module 1 according to the first embodiment.

DESCRIPTION OF SYMBOLS 1 Battery module 10 Battery module cases 21-24 Battery cells 51-54 Insulating member (Heat transfer means, Heat transfer member)
60 Heat transfer plate member (heat transfer means, heat transfer member)
61 Second heat transfer section (heat transfer section)
62 1st heat transfer section (heat transfer section)
63 1st heat transfer section (heat transfer section)
64 Second heat transfer section (heat transfer section)
70 Temperature sensor (temperature detection means)

Claims (10)

In a battery module comprising a plurality of battery cells, heat transfer means connected to the plurality of battery cells, and temperature detection means for detecting the temperature of the battery cells via the heat transfer means,
The heat transfer means has a plurality of heat transfer portions that respectively transmit thermal energy of the plurality of battery cells to the temperature detection means,
The battery module, wherein the plurality of heat transfer units have different heat transfer efficiencies depending on the distance between the battery cell and the temperature detection means. The heat transfer means includes a heat transfer member having a flat plate shape,
2. The battery module according to claim 1, wherein the plurality of heat transfer portions are formed with different cross-sectional areas of the heat transfer members. The battery module according to claim 2, wherein the plurality of heat transfer portions are formed by different widths or thicknesses of the heat transfer members. The battery module according to claim 2, wherein the plurality of heat transfer units are branched into a plurality. The temperature detecting means is a temperature sensor provided at a substantially central portion of the heat transfer member;
The battery module according to any one of claims 2 to 4, wherein the plurality of heat transfer units are configured to be point-symmetric with respect to the temperature sensor. A plurality of the battery cells are arranged side by side in one direction,
The heat transfer member is formed of a rectangular shape extending in the arrangement direction of the battery cells,
The heat transfer part is formed of a rectangular shape extending from the temperature sensor to the battery cell,
The heat transfer portion having the same distance between the battery cell and the temperature sensor is formed to extend from the temperature sensor to opposite sides in the arrangement direction of the battery cell, and intersects the arrangement direction of the battery cell. The battery module according to claim 5, wherein the battery module is arranged by shifting a position in a direction. A plurality of the battery cells are arranged side by side in one direction,
The temperature detecting means is a temperature sensor provided at a substantially central portion of the heat transfer member;
The plurality of heat transfer sections are formed in a line-symmetric form symmetrical with respect to a line passing through the temperature sensor and extending in a direction orthogonal to the arrangement direction of the plurality of battery cells. The battery module according to claim 1. Before Kiden'netsu member is comprised of a rectangular shape extending in the arrangement direction of the battery cells,
The heat transfer part is formed of a rectangular shape extending from the temperature sensor to the battery cell,
The heat transfer portion having the same distance between the battery cell and the temperature sensor is formed to extend from the temperature sensor to opposite sides in the arrangement direction of the battery cell, and intersects the arrangement direction of the battery cell. The battery module according to claim 7, wherein the battery modules are arranged at the same position in the direction. 9. The plurality of heat transfer portions are configured to have different contact areas with the battery cells according to the distance between the battery cells and the temperature detection means. The battery module as described in any one. The battery module according to any one of claims 2 to 9, wherein the heat transfer section is coated.

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