JP2014127402A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery module capable of restraining the temperature difference between a plurality of electric cells constituting a battery pack while sufficiently cooling the electric cells.SOLUTION: A battery module includes: a battery pack 1 including a plurality of electric cells sequentially arranged therein; and a cooing jacket 15 provided on the external surface of the battery pack 1 and having a cooling passage through which a cooling medium for cooling the battery pack 1 circulates. The cooling passage is formed in a meandering shape so as to shuttle between one side and the other side in the arrangement direction of the electric cells along the external surface of the battery pack 1.

Description

  The present invention relates to a battery module including an assembled battery including a plurality of single cells, and particularly relates to a cooling structure thereof.

  In a secondary battery such as a lithium ion battery, in order to ensure output voltage, battery capacity, and the like, a plurality of single cells may be connected in series and housed in a casing to be used as a battery module. In general, this type of battery module is temperature-controlled in order to stabilize charging / discharging efficiency and extend the life of components.

  In Patent Document 1, in a battery module including an assembled battery in which unit cells are stacked in the thickness direction, the cells meander in the vertical direction so as to reciprocate between the upper part and the lower part on both side surfaces in the width direction. On the other hand, there has been proposed a cooling jacket provided with a so-called serpentine type cooling medium passage through which the cooling medium flows in the thickness direction of the unit cell. In addition, the battery module of Patent Document 1 further includes a passage through which a cooling medium flows between the single cells.

Japanese Patent No. 4242501

By the way, when the positive electrode terminal and the negative electrode terminal are arranged on the upper part of the unit cell as in the battery module, the temperature of the upper part tends to rise more than the lower part of the battery module due to the Joule heat of the current flowing through the electrode terminal. There is. Therefore, when the serpentine type cooling medium passage described above is provided, the upper and lower portions of the unit cell are cooled substantially uniformly, so that the temperature difference between the upper and lower sides is not eliminated and the burden on the unit cell may increase. There is.
Furthermore, since the temperature of the cooling medium in the cooling medium passage of the battery module increases toward the downstream side, there is always a temperature difference between the unit cell arranged on the upstream side and the unit cell arranged on the downstream side. End up.
This invention is made in view of the said situation, and provides the battery module which can suppress the temperature difference between several single cells, fully cooling the several single cells which comprise an assembled battery. Is.

In order to solve the above problems, the following configuration is adopted.
A battery module according to the present invention includes an assembled battery in which a plurality of single cells are sequentially arranged, and a cooling jacket provided on an outer surface of the assembled battery and having a cooling passage through which a cooling medium for cooling the assembled battery flows. The cooling passage is formed by meandering along the outer surface of the assembled battery so as to reciprocate between one side and the other side in the arrangement direction of the unit cells.
With this configuration, the cooling medium flows in a meandering manner so as to reciprocate between one side and the other side of the unit cells in the arrangement direction, so that the cooling medium flows on one side in the unit cell arrangement direction. Compared to the case of flowing back and forth in the up-and-down direction from one side to the other side, the temperature of the whole cooling medium for cooling the single cells arranged on one side in the arrangement direction and the other side in the arrangement direction are arranged. The deviation from the temperature of the whole cooling medium for cooling the unit cell can be reduced.

Furthermore, in the battery module according to the present invention, in the battery module, the cooling passage reciprocates between one side and the other side in the arrangement direction of the unit cells from the upper part to the lower part of the assembled battery. It may be formed by meandering.
By configuring in this way, when the electrode terminal is formed on the upper part of the unit cell, the upper part where the temperature rises due to Joule heat is cooled by the cooling medium with the lowest temperature, and the lower part where the temperature rise is small. It can be cooled by a relatively high temperature cooling medium.

Furthermore, in the battery module according to the present invention, in the battery module, the cooling jacket may include a plurality of independent cooling passages from an upper part to a lower part of the assembled battery.
By comprising in this way, the temperature rise of the cooling medium in a cooling jacket can be suppressed compared with the case where it cools from the upper part to the lower part of an assembled battery using one cooling passage.

Furthermore, in the battery module according to the present invention, in the battery module, the inlets and outlets of the plurality of cooling passages are provided on one side and the other side in the arrangement direction of the unit cells, and the height of the assembled battery It may be provided at an intermediate position in the direction.
For example, in the upper or lower part of the cooling jacket, other components such as a member for fixing the battery module are often arranged, but an inlet and an outlet are arranged at an intermediate position in the height direction of the assembled battery. Therefore, a sufficient installation space for piping members connected to the inlet and the outlet can be secured. In addition, since the inlets and outlets of the plurality of cooling passages can be arranged at an intermediate position, the cooling medium can be supplied to the plurality of cooling passages by a single pipe, and a plurality of pieces can be supplied by a single pipe. The cooling medium can be discharged from the cooling passage.

Furthermore, the battery module according to the present invention may include a refrigerant flow rate adjusting mechanism for adjusting a flow rate of each cooling medium in the plurality of cooling passages in the battery module.
By comprising in this way, the flow volume of the cooling medium which flows into a some cooling medium channel | path can be adjusted separately. Therefore, the temperature difference between the upper part and the lower part of the unit cell can be further reduced.

Furthermore, in the battery module according to the present invention, in the battery module, the plurality of cooling passages include an inlet-side passage extending from the inlet of the cooling passage toward the vertical direction of the unit cell, and the inlet-side passage is The battery pack may be disposed outside the outer surface of the assembled battery.
By configuring in this way, heat exchange between the cooling medium flowing through the inlet-side passage and the unit cell is not performed, so that the portion near the inlet of the assembled battery can be prevented from being cooled more than necessary, and the cooling medium It is possible to prevent an unnecessary temperature drop.

  According to the battery module of the present invention, it is possible to suppress a temperature difference between the plurality of single cells while sufficiently cooling the plurality of single cells constituting the assembled battery.

It is a perspective view of the battery module in a first embodiment of this invention. It is the perspective view by which a part of unit cell which comprises the said battery module was fractured | ruptured. It is a disassembled perspective view of the cooling jacket which comprises the said battery module. It is front sectional drawing which shows the flow-path structure of the jacket main body of the said cooling jacket. It is front sectional drawing equivalent to FIG. 4 in 2nd embodiment of this invention. It is front sectional drawing equivalent to FIG. 4 in 3rd embodiment of this invention. It is front sectional drawing of the several cooling jacket in 4th embodiment of this invention.

Next, the battery module according to the first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the battery module 100 according to the first embodiment includes an assembled battery 1 and a cooling jacket 15 for cooling the assembled battery 1. The assembled battery 1 includes a plurality of single cells 2 that are chargeable / dischargeable secondary batteries, and is used as a power source for an electric vehicle such as an electric vehicle.

  Referring to FIG. 2, the unit cell 2 is a chargeable / dischargeable secondary battery such as a lithium ion battery, and is disposed between the positive electrode plate 6 and the negative electrode plate 7 and the positive electrode plate 6 and the negative electrode plate 7 that are alternately stacked. Each of which is provided with a separator 8 interposed therebetween, a single battery case 9 for housing the positive electrode plate 6, the negative electrode plate 7 and the separator 8, and an electrolyte solution (not shown) filled in the single battery case 9. Yes. The unit cell 2 is provided with a pair of electrode terminals 10 projecting upward from the upper surface 2A. Of the pair of electrode terminals 10, one electrode terminal 10 is a positive electrode and the other electrode terminal 10 is a negative electrode. It has become.

  The positive electrode plate 6 and the negative electrode plate 7 are both formed in a substantially rectangular shape, and the positive electrode plate 6 and the negative electrode plate 7 are laminated in a direction in which the short side of the upper surface 2A extends. That is, the positive electrode plate 6 and the negative electrode plate 7 are accommodated in the unit cell case 9 so that the stacking direction A (indicated by an arrow in FIG. 2) coincides with the direction in which the second side surface 2D of the unit cell 2 faces. ing. In the following description, the direction in which the short side of the upper surface 2A extends is referred to as the X direction, the direction in which the long side extends is referred to as the Y direction, and the height direction orthogonal to the short side and the long side is referred to as the Z direction. The Y direction and the Z direction are indicated by arrows in the figure.

  Returning to FIG. 1, the assembled battery 1 includes a substantially rectangular parallelepiped casing 11 that can accommodate a plurality of unit cells 2. By this casing 11, the stacking direction A of the plurality of single cells 2 is sequentially arranged and integrated so as to coincide with the X direction. The unit cell 2 is accommodated in the casing 11 with each first side surface 2 </ b> C contacting the inner surface of the casing 11, for example.

  Here, for example, the single cells 2 are arranged so that the positions of the positive and negative electrodes of the electrode terminals 10 (see FIG. 2) of the single cells 2 adjacent to each other in the thickness direction are staggered in the X direction. A plurality of unit cells 2 are electrically connected in series by electrode terminals 10 having different polarities being electrically connected to each other by a plate-like bus bar (not shown) or the like. Of the single cells 2 arranged at both ends in the X direction, one of the single cells 2 is not electrically connected to the electrode terminal 10 of the adjacent single cell 2 in the positive electrode terminal 10 and the insertion hole of the casing 11 It is exposed to the outside of the casing 11 through a positive electrode member (not shown) inserted through (not shown). On the other hand, among the unit cells 2 arranged at both ends in the X direction, the other unit cell 2 is not electrically connected to the electrode terminal 10 of the unit cell 2 adjacent to the negative electrode terminal 10, but the casing 11. It is exposed to the outside of the casing 11 through a negative electrode member (not shown) inserted through the insertion hole (not shown).

  The cooling jacket 15 includes a pair of substantially flat jacket main bodies 16, and a cooling medium such as cooling water is circulated through the jacket main bodies 16 so that the assembled battery 1 that is a cooling medium and an object to be cooled Heat exchange between them. These jacket bodies 16 are attached to the assembled battery 1 so as to sandwich the first side surface 2C (see FIG. 2) of the unit cell 2 from the outside. As a result, one surface of the jacket main body 16 comes into close contact with the casing side surface 11a on the first side surface 2C side of the unit cell 2. On the other hand, on a pair of second side surfaces (not shown) extending in the Y direction of the casing 11, a flat plate-like plate 17 that connects the outer walls 16 a of the jacket main body 16 substantially flush with each other is attached. An insulating sheet (not shown) having a high thermal conductivity is interposed between the jacket main body 16 and the casing side surface 11a, improving the heat transfer efficiency from the casing side surface 11a to the jacket main body 16, It is possible to ensure electrical insulation between the cooling jacket 15 and the casing 11.

  The cooling jacket 15 and the contact plate 17 are bound in the circumferential direction at a predetermined height position with the central portion in the Z direction sandwiched by a binding band 18 such as a metal band such as stainless steel or a heat-resistant fluororesin tape. As a result, the battery pack 1 is fixed. By doing so, the jacket body 16 can be easily fixed to the assembled battery 1 and, for example, the deformation of the assembled battery 1 in the expansion direction is suppressed, and deterioration over time such as the charge / discharge characteristics of the unit cell 2 is prevented. Can be suppressed.

As shown in FIG. 3, the jacket main body 16 includes a passage portion 20 and a lid portion 21.
The passage portion 20 constitutes a side wall 23 and a bottom wall 24 of a cooling passage 22 provided inside the jacket body 16. The passage portion 20 has a pair of inlet openings 26a and 26b vertically adjacent to each other so as to allow the cooling medium to flow into an intermediate position that is a substantially central portion in the Z direction of the outer wall 16a disposed on one side in the X direction. Is formed. Further, the passage portion 20 has a pair of outlet openings 27a and 27b vertically for allowing the cooling medium to flow out at an intermediate position which is substantially the center in the Z direction of the outer wall 16a disposed on the other side in the X direction. Adjacent to each other. The passage portion 20 is made of a material such as a metal having high thermal conductivity, and is formed by, for example, casting or machining. The inlet openings 26a and 26b are connected to a common supply pipe (not shown) for supplying a cooling medium, and the outlet openings 27a and 27b are commonly used to discharge the cooling medium. A discharge pipe (not shown) is connected.

  A flat lid portion 21 is attached to the passage portion 20 by brazing or bonding. As a result, the passage portion 20 is closed by the lid portion 21, and the cooling passage 22 in which the cooling medium flows is defined by the side wall 23, the bottom wall 24, and the lid portion 21 inside the jacket body 16.

  As shown in FIG. 4, the cooling passage 22 has a first cooling passage 22 a formed on the upper side of the central wall 28 extending in the X direction at a substantially center in the Z direction, and a first cooling passage 22 formed on the lower side of the central wall 28. It consists of two cooling passages 22b. The first cooling passage 22a and the second cooling passage 22b are independently formed from the upper part to the lower part of the assembled battery 1.

  The first cooling passage 22a includes a first inlet-side passage 30a extending from an upper inlet opening 26a formed in one outer wall 16a to the upper wall 16b along the one outer wall 16a. The first cooling passage 22a includes a meandering passage 31a that connects the first inlet-side passage 30a and the upper outlet opening 27a formed in the other outer wall 16a. The meandering passage 31 a is formed to meander so as to reciprocate between one side and the other side in the X direction, which is the arrangement direction of the cells 2.

  The second cooling passage 22b is formed vertically symmetrical with the first cooling passage 22a described above. That is, the second cooling passage 22b includes a second inlet side passage 30b extending from the lower inlet opening 26b formed in the one outer wall 16a to the lower wall 16c along the one outer wall 16a. . The second cooling passage 22b includes a meandering passage 31b that connects the second inlet-side passage 30b and the lower outlet opening 27b formed in the other outer wall 16a. The meandering passage 31b is formed to meander so as to reciprocate between one side and the other side in the X direction which is the arrangement direction of the cells 2.

  The first cooling passage 22a includes a plurality of linear portions 32a extending in the X direction between the other side wall 23a of the first inlet side passage 30a and the other outer wall 16a of the passage portion 20, and each of the first cooling passages 22a adjacent to each other vertically. And a plurality of folded portions 33a that connect the end portions of the straight portion 32a to each other to form a meandering flow path from the upper part to the lower part of the assembled battery 1.

  Similarly, the second cooling passage 22b includes a plurality of linear portions 32b extending in the X direction between the other side wall 23b of the second inlet side passage 30b and the other outer wall 16a of the passage portion 20, and vertically. A plurality of folded portions 33b that connect the ends of the adjacent straight portions 32b to each other, and a flow path that meanders from the lower part to the upper part of the assembled battery 1 is formed. Moreover, each linear part 32a, 32b has mutually shared the side wall 23 by linear part 32a, 32b which adjoins, respectively.

  Therefore, according to the battery module 100 of the first embodiment described above, the cooling medium flows in a meandering manner so as to reciprocate between the one side and the other side in the arrangement direction of the unit cells 2, so that the cooling medium Compared to the case where the unit cells 2 flow so as to reciprocate vertically from one side of the arrangement direction to the other side, the entire cooling medium for cooling the unit cells 2 arranged on one side of the arrangement direction Deviation between the temperature and the temperature of the entire cooling medium that cools the cells 2 arranged on the other side in the arrangement direction can be reduced. As a result, it is possible to suppress a temperature difference between the plurality of single cells 2.

  Further, in the first cooling passage 22a, when the electrode terminal 10 is formed on the upper part of the unit cell 2, the upper part of the unit cell 2 whose temperature is increased by Joule heat is cooled by the cooling medium having the lowest temperature. Thus, since the lower part where the temperature rise is small can be cooled by the relatively high temperature cooling medium, the temperature difference between the upper part and the lower part of each unit cell 2 can be reduced.

  Furthermore, since the first cooling passage 22a and the second cooling passage 22b are provided, the temperature increase of the cooling medium in the cooling jacket 15 can be suppressed as compared with the case where one cooling passage is used. Sufficient cooling performance for both the upper part and the lower part of the assembled battery 1 can be ensured.

  In addition, other components such as a member for fixing the battery module 100 are often arranged on the upper or lower portion of the cooling jacket 15, but the inlet opening 26 a is located at an intermediate position in the height direction of the assembled battery 1. , 26b and outlet openings 27a and 27b can secure sufficient installation space for piping members and the like connected to the inlet openings 26a and 26b and the outlet openings 27a and 27b. Furthermore, since the inlet openings 26a, 26b of the first cooling passage 22a and the second cooling passage 22b can be arranged at an intermediate position, the first cooling passage 22a and the second cooling passage can be arranged by a single common pipe. A cooling medium can be supplied to the passage 22b. In addition, since the outlet openings 27 of the first cooling passage 22a and the second cooling passage 22b can be arranged at an intermediate position, the first cooling passage 22a and the second cooling passage 22b are provided by a single common pipe. The cooling medium can be discharged from. As a result, it is possible to prevent the pipe installation work from becoming complicated and improve the assemblability.

  Next, the battery module 200 of 2nd embodiment of this invention is demonstrated based on drawing. The battery module 200 of the second embodiment is different from the battery module 200 of the first embodiment described above only in that a configuration for adjusting the flow rate of the cooling medium is added. A description will be given, and a duplicate description will be omitted.

  The cooling jacket 15 of the battery module 200 in this embodiment includes a pair of substantially flat jacket bodies 16 as in the first embodiment described above, and the first cooling passage 22a and the jacket body 16 are provided inside the jacket body 16. A second cooling passage 22b is formed. In addition, a pair of inlets for allowing the cooling medium to flow into the first cooling passage 22a and the second cooling passage 22b, at an intermediate position in the Z direction, on the outer wall 16a disposed on one side of the jacket body 16 in the X direction. Opening portions 26a, 26b are formed adjacent to each other in the Z direction. Further, the outer wall 16a disposed on the other side in the X direction of the jacket body 16 is for a pair of outlets for allowing the cooling medium to flow out from the first cooling passage 22a and the second cooling passage 22b to an intermediate position in the Z direction. Openings 27a and 27b are formed adjacent to each other in the Z direction.

  As shown in FIG. 5, the first cooling passage 22a and the second cooling passage 22b include a refrigerant flow rate adjusting mechanism 40 that adjusts the flow rate of the cooling medium flowing through the first cooling passage 22a and the second cooling passage 22b. Is provided. The refrigerant flow rate adjusting mechanism 40 reduces the flow path area when the cooling medium flows into the first cooling passage 22a and the flow path area when the cooling medium flows into the second cooling path 22b. The flow rate of the cooling medium flowing through the cooling passage 22a and the second cooling passage 22b is adjusted. For example, an orifice plate can be used as the mechanism for reducing the flow path area.

  Further, the refrigerant flow rate adjusting mechanism 40 described above flows into the second cooling passage 22b that cools the lower portion of the assembled battery 1 rather than the flow rate of the cooling medium that flows into the first cooling passage 22a that cools the upper portion of the assembled battery 1. The flow rate of the cooling medium is adjusted to be relatively reduced. This is because the temperature rise in the lower part is less than the temperature rise in the upper part of the assembled battery 1.

  Therefore, according to the battery module 200 of the second embodiment described above, the flow rate of the cooling medium flowing through the first cooling passage 22a and the second cooling passage 22b can be individually adjusted. The temperature difference with the lower part can be further reduced.

  In the second embodiment described above, the case where the refrigerant flow rate adjusting mechanism 40 is provided in the inlet openings 26a and 26b has been described. However, the refrigerant flow rate adjusting mechanism 40 is disposed in the first cooling passage 22a and the second cooling passage. If the flow rate of the cooling medium flowing to 22b can be adjusted individually, the arrangement is not limited to the above, and for example, it is provided in the outlet openings 27a and 27b, or the inlet openings 26a and 26b and the outlet openings 27a and 27b. And may be provided in the middle of the first cooling passage 22a and the second cooling passage 22b.

  Next, the battery module 300 in 3rd embodiment of this invention is demonstrated based on drawing. Note that the battery module 300 of the third embodiment is different only in the arrangement of the inlet-side passages in the battery module 100 of the first embodiment described above, and therefore, the same portions are denoted by the same reference numerals and redundantly described. Is omitted.

  The cooling jacket 15 of the battery module 300 in this embodiment includes a pair of substantially flat jacket main bodies 16, similar to the cooling jacket 15 of the first embodiment described above. A passage 22a and a second cooling passage 22b are formed. Further, a pair of inlet openings for allowing the cooling medium to flow into the first cooling passage 22a and the second cooling passage 22b at an intermediate position in the Z direction on the side wall disposed on one side of the jacket body 16 in the X direction. The portions 26a and 26b are formed adjacent to each other in the Z direction. Further, the outer wall 16a disposed on the other side in the X direction of the jacket body 16 is for a pair of outlets for allowing the cooling medium to flow out from the first cooling passage 22a and the second cooling passage 22b to an intermediate position in the Z direction. Openings 27a and 27b are formed adjacent to each other in the Z direction.

  As shown in FIG. 6, the first cooling passage 22 a and the second cooling passage 22 b are formed by the first inlet side passage 30 a and the second inlet side passage extending along the one outer wall 16 a from the inlet openings 26 a and 26 b. 30b is arrange | positioned in the X direction (stacking direction of the cell 2) rather than the 1st side surface (outer surface) 2C of the assembled battery 1 by the front view seen from the Y direction.

  Therefore, according to the battery module 300 of the second embodiment, the cooling medium having the lowest temperature immediately after flowing into the cooling jacket 15 from the inlet openings 26a and 26b and the inlet openings 26a and 26b of the unit cell 2 are provided. Since heat exchange is not performed with the first side surface 2C in the vicinity, the first side surface 2C in the vicinity of the inlet openings 26a and 26b can be prevented from being cooled more than necessary, and an unnecessary temperature of the cooling medium can be prevented. Decline can be prevented. Moreover, about the 1st cooling channel | path 22a, the cooling medium with little temperature fall can be supplied to the upper part of the assembled battery in which temperature rises most. As a result, the unit cell 2 can be uniformly and sufficiently cooled.

  Next, battery modules 400A to 400C according to a fourth embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as 1st embodiment mentioned above.

  As shown in FIG. 7, in the fourth embodiment, the cooling jackets 15A to 15C of the plurality of battery modules 400A to 400C are connected in series. These cooling jackets 15 include the cooling jacket 15A provided in the upstream battery module 400A and the cooling jacket 15B provided in the downstream battery module 400C, and the number of turns of the first cooling passage 22a and the second cooling passage 22b. That is, the number of reciprocations between one side and the other side in the X direction is changed. More specifically, the cooling jacket 15A disposed on the upstream side has a smaller number of reciprocations, while the cooling jacket 15C provided on the downstream side has a larger number of reciprocations. In addition, about the cooling jacket 15B of the battery module 400B arrange | positioned between battery module 400A, 400C, the number of the said folding | turning is made into the number between the folding | turning frequency in cooling jacket 15A, 15C.

  Therefore, according to the battery modules 400A to 400C of the above-described fourth embodiment, the flow path length through which the cooling medium flows becomes shorter in the upstream cooling jacket 15A, so that the temperature rise of each of the battery modules 400A to 400C is about the same. In this case, the temperature increase of the cooling medium on the upstream side can be suppressed. As a result, the temperature difference of the cooling medium flowing through the cooling jackets 15A to 15C for cooling the battery modules 400A to 400C can be reduced, and the temperature difference between the battery modules 400A to 400C can be reduced.

  Here, when the cooling jackets 15A to 15C of the plurality of battery modules 400A to 400C are connected in series as in the fourth embodiment, the inlet openings 26a and 26b and the outlet openings 27a and 27b are arranged in the Z direction. By arranging them at the intermediate position, that is, at the same height position, it is possible to reduce the piping length between the battery modules and to reduce the burden of piping work.

The present invention is not limited to the configuration of each of the above-described embodiments, and the design can be changed without departing from the gist thereof.
For example, in the above-described embodiment, the case where the first cooling passage 22a and the second cooling passage 22b are provided for one jacket body 16 has been described. However, the number of cooling passages is not limited to two. Alternatively, only one cooling passage may be provided, or three or more cooling passages may be provided.

  Further, in the cooling jacket 15 shown in FIGS. 4 to 7 of the above-described embodiment, the case where the inlet openings 26a and 26b are provided on the left side and the outlet openings 27a and 27b are provided on the right side when viewed from the front is described. Not limited to this arrangement, the left and right arrangements may be interchanged.

  Furthermore, in the description of the above-described embodiment, an example in which the inlet opening 26 and the outlet opening 27 are disposed at the middle positions in the vertical direction of the assembled battery 1 has been described. Or a lower position, etc., may be appropriately arranged. Further, the arrangement of the inlet openings 26a, 26b and the outlet openings 27a, 27b does not necessarily have to coincide with each other in the vertical (Z) direction, and the inlet openings 26a, 26b and the outlet openings 27a are not necessarily aligned. , 27b may be arranged at a place other than the intermediate position in the Z direction described above.

1 assembled battery 2 single cell 11a casing side surface (outer surface)
15 Cooling jacket 22a First cooling passage (cooling passage)
22b Second cooling passage (cooling passage)
26a, 26b Entrance opening (inlet)
27a, 27b Exit opening (exit)
30a First entrance side passage (entrance side passage)
30b Second entrance side passage (entrance side passage)
40 Refrigerant flow rate adjustment mechanism

Claims (6)

An assembled battery in which a plurality of cells are sequentially arranged;
A cooling jacket provided on the outer surface of the assembled battery and having a cooling passage through which a cooling medium for cooling the assembled battery flows.
The cooling passage is
A battery module, wherein the battery module is formed by meandering along the outer surface of the battery assembly so as to reciprocate between one side and the other side in the arrangement direction of the unit cells.   The battery module according to claim 1, wherein the cooling passage is formed by meandering so as to reciprocate between one side and the other side in the arrangement direction of the unit cells from the upper part to the lower part of the assembled battery.   The battery module according to claim 1, wherein the cooling jacket includes a plurality of cooling passages independent from an upper part to a lower part of the assembled battery.   4. The battery module according to claim 3, wherein an inlet and an outlet of the plurality of cooling passages are provided on one side and the other side in the arrangement direction of the unit cells, and are provided at intermediate positions in the height direction of the assembled battery. .   The battery module according to claim 3, further comprising a refrigerant flow rate adjusting mechanism that adjusts the flow rate of each cooling medium in the plurality of cooling passages.   The plurality of cooling passages include an inlet-side passage that extends from an inlet of the cooling passage toward a vertical direction of the unit cell, and the inlet-side passage is disposed outside an outer surface of the assembled battery. Item 6. The battery module according to Item 4 or 5.

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