JP2018032579A - Battery unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery unit capable of stably maintaining a state in which a battery cell and a cooler are in close contact with each other and efficiently cooling the battery cell with the cooler.SOLUTION: A battery unit 50 includes: a battery cell 10; a cooler 2 provided on a lower side of the battery cell 10; a plate spring 3 for pressing the cooler 2 against the battery cell 10; a battery pack case 5 in which the battery cell 10, the cooler 2, and the plate spring 3 are stored; and a pressing member 6 that is attached to the battery pack case 5 and presses the battery cell 10 from an upper side so that the battery cell 10 does not move upwards.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery unit including a battery cell and a cooler.

  Conventionally, as a battery unit, there is one described in Patent Document 1. In this battery unit, the battery module group is configured by stacking a plurality of battery modules and is accommodated in a case. A water jacket is attached to the lower wall of the case from the outside. A gel is disposed between the battery module group and the water jacket, and heat exchange between the battery module group and the water jacket is performed via the gel.

Japanese Patent Laying-Open No. 2014-093245 (FIG. 2)

  In the battery unit of Patent Document 1, there is no means for bringing the battery module group into close contact with the gel and no means for bringing the water jacket into close contact with the gel. Therefore, a gap may be generated between the battery module group and the water jacket, and the battery module group may not be efficiently cooled by the gap.

  An object of the present invention is to provide a battery unit that can stably maintain a state in which a battery cell and a cooler are in close contact with each other and can efficiently cool the battery cell with a cooler.

  The battery unit according to the present invention includes a battery cell, a cooler provided below the battery cell, a biasing member that presses the cooler against the battery cell, the battery cell, the cooler, and the attachment. The biasing member includes a battery pack case to be stored, and a pressing member that is attached to the battery pack case and presses the battery cell from above so that the battery cell does not move upward.

  According to the battery unit of the present invention, the battery cell and the cooler are densely formed by the biasing member that presses the cooler against the battery cell and the pressing member that presses the battery cell from above so that the battery cell does not move upward. The contact state can be stably maintained. Therefore, the heat conduction between the cooler and the battery cell becomes good, and the battery cell can be efficiently cooled by the cooler.

It is a figure when a part in battery unit concerning one embodiment of the present invention is seen from the side. It is a schematic plan view when the battery unit is viewed from above. It is a figure for demonstrating the urging | biasing operation | movement which a leaf | plate spring presses a cooler against a battery stack.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, it is assumed from the beginning that a new embodiment is constructed by appropriately combining the features of the embodiments and modifications described below.

  FIG. 1 is a view of a part of a battery unit 50 according to an embodiment of the present invention when viewed from the side, and FIG. 2 is a schematic plan view when the battery unit 50 is viewed from above. . FIG. 3 is a diagram for explaining an urging operation in which the leaf spring 3 described below presses the cooler 2 against the battery stack 1.

  In FIG. 1, only the battery pack case 5 of the battery unit 50 is shown in cross section so that the internal configuration of the battery unit 50 can be easily understood. In FIG. 2, the battery stack 1 shows only the outline of the upper surface, illustration of electrodes and bus bars on the upper surface of the battery stack 1 is omitted, and illustration of resin holders 62 and 63 described below is also omitted. In the following description, the X direction is the longitudinal direction of the battery unit 50 and the stacking direction of the battery cells 10. Further, the Y direction is the width direction (short method) of the battery unit 50 and is a direction orthogonal to the stacking direction. The Z direction is the height direction of the battery unit 50.

  As shown in FIG. 1, the battery unit 50 includes a plurality of battery stacks 1, a plurality of coolers 2, a plurality of leaf springs 3, a battery pack case 5, and a pressing member 6. The leaf spring 3 is an example of an urging member. As shown in FIG. 2, the plurality of battery stacks 1 are arranged at intervals in the Y direction, and each battery stack 1 has a plurality of battery cells 10 stacked in the X direction. Each battery cell 10 includes a secondary battery (a chargeable / dischargeable battery such as a lithium ion battery or a nickel metal hydride battery). As shown in FIG. 1, each battery cell 10 is provided with a positive electrode 11 and a negative electrode 12 protruding upward in the Z direction from the upper surface of the battery cell 10.

  The plurality of battery cells 10 included in the battery stack 1 are connected in series, for example. In this case, with respect to two battery cells 10 adjacent in the X direction, a plate-like bus bar (not shown) in which the positive electrode 11 of one battery cell 10 and the negative electrode 12 of the other battery cell are made of a conductive material. Electrically connected. Male screws are provided on the side surfaces of the positive electrode 11 and the negative electrode 12, and two through holes for electrode attachment are provided in the bus bar. One electrode mounting through hole of the bus bar is passed through the positive electrode 11 of one battery cell 10 and then tightened from above with a nut (not shown), and the other electrode mounting through hole of the bus bar is connected to the other battery cell 10. After passing through the negative electrode 12, the nut is tightened from above with a nut. In this way, the bus bar is attached to the positive electrode 11 of one battery cell 10 and the negative electrode 12 of the other battery cell 10, and the positive electrode 11 of one battery cell 10 and the negative electrode 12 of the other battery cell 10 are electrically connected. To do.

  Note that at least one battery stack may include a plurality of battery cells connected in parallel. Moreover, the battery cell 10 may be comprised by one single battery (single battery of a secondary battery), and may also contain the several single battery (single battery of secondary battery) connected in parallel or in series. Although not described in detail, the battery unit 50 includes a device 21 as shown in FIG. The device 21 is electrically connected to each battery stack 1. The device 21 includes a voltage sensor that detects the voltage of the battery stack 1, a current sensor that detects the current of the battery stack 1, a temperature sensor that detects the temperature of the battery stack 1, and the battery stack 1 based on information from these sensors. And a control device for monitoring the state of this.

  As shown in FIG. 1, the cooler 2 includes a water jacket 25 and a cooling mechanism (not shown). The water jacket 25 has a flat shape, and the upper surface of the water jacket 25 is in close contact with the lower surface of the battery stack 1. Contact in state. The configuration in which the upper surface of the water jacket 25 is in close contact with the lower surface of the battery stack 1 will be described in detail later. The water jacket 25 has an X-direction length that is substantially the same as the X-direction length of the battery stack 1, and is in close contact with the battery stack 1 from one end to the other end of the battery stack 1. Although not described in detail because it is a known structure, the cooler 2 cools the battery stack 1 as shown below, for example.

  Specifically, the water jacket 25 is incorporated in a line in which water is enclosed, and the enclosed water circulates in the line by a pump. The cooling mechanism includes a heat pump chiller (a device that makes cold water using a heat pump). The heat pump chiller includes a cold water generator, and the cold water generator is incorporated in the line. With this cold water generator, the heat circulating between the water circulating in the line and the cryogenic liquid refrigerant generated by the vehicle air conditioning system is exchanged.

  The vehicle air conditioning system includes a compressor, a condenser, and an evaporator. The refrigerant is compressed by the compressor and the temperature rises. The refrigerant whose temperature has increased undergoes heat exchange with the outside air in the condenser, and the temperature decreases and liquefies. Cold water is produced | generated when the refrigerant | coolant which became liquefied and became cryogenic heat-exchanges with the above-mentioned water with a cold water generator. Cold water generated by the cold water generator is supplied into the water jacket 25, and the cold water absorbs the heat of the battery stack 1 to cool the battery stack 1. In this example, the case where cold water is supplied to the water jacket 25 has been described. However, the battery stack may be cooled by supplying cold refrigerant (fluid) other than water into the jacket.

  The leaf spring 3 is a metal spring and is provided on the lower side of each battery cell 10, more specifically on the lower side of the water jacket 25. As shown in FIG. 3, the leaf spring 3 has a flat pressing portion 3 a extending in the Y direction, and the pressing portion 3 a is arranged to extend in the Y direction. The leaf spring 3 bisects the pressing portion 3a vertically and is substantially plane-symmetric with respect to a vertical bisector including the Z direction. In addition to the pressing portion 3a, the leaf spring 3 includes a first obliquely lower extending portion 3b, an obliquely upper extending portion 3c, a second obliquely lower extending portion 3d, and a flat mounting portion 3e.

  Since the leaf spring 3 has the above-described plane-symmetric structure, only the structure on one side in the Y direction of the pressing portion will be described. The first obliquely extending portion 3b is the end portion on one side in the Y direction of the pressing portion 3a. Extends diagonally downward from one side in the Y direction to the lower side in the Z direction. Further, the obliquely upper extending portion 3c extends obliquely upward from the end on one side in the Y direction of the first obliquely lower extending portion 3b to the one side in the Y direction and the upper side in the Z direction. The extending portion 3d extends obliquely downward from one end in the Y direction of the oblique upper extending portion 3c to the one side in the Y direction and the lower side in the Z direction. Further, the flat mounting portion 3e extends in a direction substantially parallel to the Y direction from an end portion on one side in the Y direction of the second obliquely lower extending portion 3d.

  Referring again to FIG. 1, a heat insulating material 33 is spread below the cooler 2 in the lower space in the battery pack case 5. The heat insulating material 33 is provided with a spring passage hole 31 that allows a part of the leaf spring 3 to pass around the place where the leaf spring 3 is installed. The heat insulating material 33 is provided to suppress the radiant heat from the lower surface of the battery pack case from being transmitted to the water jacket 25 and is used for positioning the leaf spring 3. The leaf spring 3 is attached to the battery unit 50 by the heat insulating material 33. It is attached on the lower side in the Z direction.

  Specifically, the heat insulating material 33 includes a pressing portion support portion 41 and a spring fixing portion 42. The pressing portion support portion 41 has a rectangular shape in FIG. 1, and the back surface (the surface on the lower side in the Z direction) of the pressing portion support portion 41 is attached in close contact with the bottom surface of the battery pack case. On the other hand, the spring fixing portions 42 are disposed on both sides in the Y direction of the respective pressing portion support portions 41. The spring fixing portion 42 is attached to the battery pack case bottom so that a gap in the Z direction is generated. Specifically, the spring fixing portion 42 includes two end-side fixing portions 42a provided at both ends in the Y direction of the battery pack case, and an inner fixing portion 42b provided between the two end-side fixing portions 42a in the Y direction. including. Moreover, the battery pack case bottom part has the latching | locking part 5c and the protrusion part 5d.

  The locking portion 5c has a substantially rectangular shape in FIG. 1, and is provided so as to protrude upward in the Z direction at both ends in the Y direction of the bottom of the battery pack case. Moreover, the end side fixing | fixed part 42a has a recessed part of the shape corresponding to the front-end | tip part of the latching | locking part 5c on the Y direction one side and Z direction lower side, and the said recessed part is engage | inserted by the front-end | tip part of the latching | locking part 5c. With this configuration, the end-side fixing portion 42a is stably fixed to the bottom of the battery pack case while the end-side fixing portion 42a receives the upper reaction force from the locking portion 5c. The Z direction height of the latching | locking part 5c is higher than the Z direction height of the said recessed part. As a result, the gap 75 in the Z direction is provided between the end-side fixing portion 42a and the battery pack case bottom surface in a state where the end-side fixing portion 42a is stably fixed to the battery pack case bottom.

  On the other hand, the protruding portion 5d has a substantially rectangular shape in FIG. 1, and protrudes upward in the Z direction from a portion other than the end portion in the Y direction on the bottom of the battery pack case. The inner fixing portion 42b has a concave portion having a shape corresponding to the distal end portion of the protruding portion 5d on the lower side in the Z direction, and the concave portion extends in the Z direction. The inner fixing portion 42b is fixed to the bottom of the battery pack case by fixing the tip of the protruding portion 5d to the concave portion by press fitting or the like. The Z direction length of the recessed part of the inner side fixing part 42b is shorter than the Z direction height of the protrusion part 5d. As a result, the gap 75 in the Z direction is provided between the inner fixing portion 42b and the bottom surface of the battery pack case in a state where the inner fixing portion 42b is fixed to the bottom portion of the battery pack case.

  The spring passage holes 31 are provided on both sides in the Y direction of the pressing portion support portion 41, and the spring fixing portions 42 face the pressing portion support portion 41 in the Y direction via the spring passage holes 31. The upper surface (the upper surface in the Z direction) of the pressing portion support portion 41 extends substantially parallel to the bottom surface of the battery pack case. The length in the Y direction of the upper surface of the pressing portion support portion 41 is preferably the same as or shorter than the length in the Y direction of the pressing portion 3a of the leaf spring 3, and is preferably slightly shorter than the length in the Y direction of the pressing portion 3a.

  The pressing portion 3a of the leaf spring 3 is placed on the upper surface of the pressing portion support portion 41, and includes a first obliquely lower extending portion 3b, an obliquely upper extending portion 3c, and a second obliquely lower extending portion 3d. The portion that passes through the spring passage hole 31. A heat insulating sheet 55 having a substantially U-shaped cross section having an opening on one side in the Y direction is disposed and fixed in the gap 75 in the Z direction. The plate spring 3 is attached to the bottom of the battery pack case by the flat attachment portion 3e being fitted and fixed in the heat insulating sheet 55 through the opening. According to this embodiment, the edge part of the leaf | plate spring 3 is engage | inserted by the heat insulation sheet 55, and the heat insulation sheet 55 which accommodated the edge part of the spring member 3 contacts a battery pack case bottom face. Therefore, heat from the battery pack case bottom surface is transmitted to the leaf spring 3 via the heat insulating sheet 55, so that heat can be greatly suppressed from being transmitted from the battery pack case bottom surface to the leaf spring 3, and heat is transferred from the battery pack case bottom surface to the water jacket. 25 can be greatly suppressed.

  As shown in FIG. 1, the water jacket 25 has a top surface and a back surface that are substantially parallel to the bottom surface of the battery pack case. The upper surface of the water jacket 25 abuts on the back surface of the battery stack 1, and the back surface of the water jacket 25 faces the pressing portion 3 a of the leaf spring 3 in the Z direction. Between the back surface of the water jacket 25 and the upper surface of the pressing portion 3a of the leaf spring 3, an insulating heat insulating sheet 8 having insulating properties and heat insulating properties is disposed. Since the insulating heat insulating sheet 8 is disposed between the water jacket 25 and the pressing portion 3a of the leaf spring 3, the battery cell 10 and the leaf spring 3 can be insulated, and electrical stability can be ensured. . Further, the arrangement of the insulating heat insulating sheet 8 can substantially prevent the heat transmitted from the battery pack case 5 to the leaf spring 3 from being transmitted to the water jacket 25. Therefore, it is possible to substantially prevent the cooling performance of the water jacket 25 from being lowered by the heat from the leaf spring 3.

  The pressing member 6 includes a lean hose 61, an end side resin holder 62, and an inner side resin holder 63. The end side resin holder 62 is disposed in the gap in the Y direction between the battery stack 1 at the end in the Y direction and the side wall portion located at the end in the Y direction in the battery pack case 5. The end-side resin holder 62 extends in the Z direction from the upper side in the Z direction of the battery stack 1 to the lower side in the Z direction of the battery stack 1 along the side surface in the Y direction of the battery stack 1. The end-side resin holder 62 includes a flat pressed portion 62a and a locking portion 62b. The pressed portion 62 a is provided at the upper end portion in the Z direction of the end side resin holder 62, and the upper surface of the pressed portion 62 a extends substantially parallel to the bottom surface of the battery pack case 5. As will be described in detail later, the pressed portion 62a is pressed downward in the Z direction by the lean hose 61.

  The locking part 62b is provided below the pressed part 62a in the Z direction. The locking portion 62 b protrudes in the Y direction from the plate-like main body portion 62 c of the end side resin holder 62 toward the battery stack 1 side. The lower surface of the locking portion 62 b extends substantially parallel to the bottom surface of the battery pack case 5. The end-side resin holder 62 has an X-direction length substantially equal to the X-direction length of the battery stack 1 and extends in the X direction along the side surface of the battery stack 1. It extends in the same length X direction as the resin holder 62. When viewed from the Z direction, the lower surface on the distal end side of the locking portion 62 b overlaps the upper surface of each battery cell 10 included in the battery stack 1.

  On the other hand, the inner resin holder 63 is disposed between the two battery stacks 1 adjacent to each other in the Y direction. The inner resin holder 63 extends in the Z direction from the upper side in the Z direction of the battery stack 1 to the lower side in the Z direction of the battery stack 1 along the side surface in the Y direction of the battery stack 1. Further, the inner resin holder 63 includes a flat pressed portion 63a, a first locking portion 63b, and a second locking portion 63c. The pressed part 63 a is provided at the upper end of the inner resin holder 63 in the Z direction, and the upper surface of the pressed part 63 a extends substantially parallel to the bottom surface of the battery pack case 5. As will be described in detail later, the pressed portion 63a is also pressed downward in the Z direction by the lean hose 61 in the same manner as the pressed portion 62a.

  The first and second locking portions 63b and 63c are provided below the pressed portion 63a in the Z direction. The first locking part 63b protrudes from the plate-shaped main body part 63d of the inner resin holder 63 to one side in the Y direction, and the second locking part 63c protrudes from the main body part 63d to the other side in the Y direction. The lower surfaces of the first and second locking portions 63 b and 63 c extend substantially parallel to the bottom surface of the battery pack case 5. The inner resin holder 63 has an X-direction length that is substantially the same as the X-direction length of the battery stack 1 and extends in the X direction along the side surface of the battery stack 1, and includes first and second locking portions 63b. 63c also extend in the same length X direction as the inner resin holder 63. When viewed from the Z direction, the lower surface on the tip side of the first locking portion 63b overlaps the upper surface of each battery cell 10 included in the battery stack 1 on one side in the Y direction of the inner resin holder 63, and the second locking The lower surface on the tip side of the portion 63c overlaps the upper surface of each battery cell 10 included in the battery stack 1 on the other side in the Y direction of the inner resin holder 63.

  As shown in FIG. 2, the battery pack case 5 is open on the upper side in the Z direction. As shown in FIGS. 1 and 2, the lean hose 61 crosses the upper part of the battery stack 1 near the center in the X direction from the one side of the battery pack case 5 in the Y direction to the other side in the Y direction. As shown in FIG. 1, one end of the lean hose 61 in the Y direction is attached to the upper portion 5 a of one end of the battery pack case 5 in the Y direction by a fastening member 40 composed of a bolt or the like. The end portion is also attached to the upper portion 5b (see FIG. 2) of the other end portion in the Y direction of the battery pack case 5 by the fastening member 40.

  The lean hose 61 has an end-side flat plate portion 61a that overlaps the pressed portion 62a of the end-side resin holder 62 when viewed from the Z direction, and the pressed portion 63a of the inner resin holder 63 when viewed from the Z direction. It has the inner side flat plate part 61b which overlaps. When the lean hose 61 is fastened to the upper part of the battery pack case, the end side flat plate portion 61 a presses the pressed portion 62 a of the end side resin holder 62 downward in the Z direction, and the inner flat plate portion 61 b is covered by the inner resin holder 63. The pressing part 63a is pressed downward in the Z direction. Thereby, the end side resin holder 62 is given a downward force, and the engaging portion 62b of the end side resin holder 62 covers the upper surface of each battery cell 10 included in the battery stack 1 located at the end in the Y direction. Press down. Similarly, the inner resin holder 63 is given a downward force, and the first locking portion 63b of the inner resin holder 63 is included in the battery stack 1 on one side in the Y direction of the inner resin holder 63. The upper surface of each battery cell 10 is pressed downward, and the upper surface of each battery cell 10 included in the battery stack 1 in which the second locking portion 63c of the inner resin holder 63 is on the other side in the Y direction of the inner resin holder 63 is pressed. Press down.

  As a result, each battery cell 10 presses the leaf spring 3 downward in the Z direction indicated by an arrow A in FIG. 3 via the water jacket 25 and the insulating heat insulating sheet 8. As a result, the first obliquely lower extending portion 3b, the obliquely upper extending portion 3c, and the second obliquely lower extending portion 3d are distorted downward, and the leaf spring 3 is lowered from the position indicated by the solid line to the position indicated by the dotted line. Deforms to the side. As a result, the first slanting lower extension 3b, the slanting upper extension 3c, and the second slanting lower extension 3d are indicated by an arrow B in an attempt to move upward to the solid line position to eliminate these distortions. A restoring force in the upward direction is generated, and the water jacket 25 that receives this restoring force via the insulating heat insulating sheet 8 is pressed toward the battery stack 1 side.

  According to the above embodiment, the end side and the inner resin holders 62 and 63 pressed downward by the attachment of the lean hose 61 always press the battery cell 10 downward, so that the battery cell 10 is pressed downward. Force can be generated constantly. Further, the lean hose 61 and the end side and inner resin holders 62 and 63 are in contact with each other, and the locking portions 62b, 63b and 63c of the end side and inner resin holders 62 and 63 and the upper surface of the battery cell 10 are in contact with each other. The upward displacement of the battery cell 10 is substantially prevented, and the force that the end side and inner resin holders 62 and 63 press the battery cell 10 downward is not eliminated. Therefore, the leaf spring 3 can be constantly deformed downward by the lower force from the battery cell 10, and the water jacket 25 can be constantly pressed against the lower surface of the battery cell 10 by the restoring force above the leaf spring 3. As a result, the state in which the battery cell 10 is in close contact with the water jacket 25 can be stably maintained, the heat conduction between the water jacket 25 and the battery cell 10 becomes good, and the battery cell 10 is It can be cooled efficiently.

  Further, since the leaf spring 3 has a structure capable of absorbing the vertical displacement, the leaf spring 3 can follow the height deviation of the plurality of battery cells 10 in the stacking direction of the battery cells 10, and the leaf spring 3 can absorb the height deviation. Further, the leaf spring 3 can follow the displacement of the battery cell 10 in the Z direction due to vibration or the like, and the leaf spring 3 can absorb the vibration. Furthermore, since the leaf spring 3 is made of metal, a stable reaction force (restoring force) can be obtained over a long period of time, and the impact that the battery cell 10 receives from below due to road surface interference can also be sustained over a long period of time with the leaf spring 3. It can absorb stably and can reduce the impact. Therefore, damage to the battery unit 50 can be suppressed.

  Further, the end side and inner resin holders 62, 63 have flat pressed portions 62a, 63a at the upper end portions, and the lean hose 61 abuts against the pressed portions 62a, 63a so that the pressed portion 62a. Since the flat plate portions 61a and 61b are pressed downward, the pressing load from above can be efficiently transmitted from the lean hose 61 to the inner resin holders 62 and 63.

  Furthermore, since the lean hose 61 is configured to cross the upper part of the battery pack case from one side in the Y direction to the other side in the Y direction, the battery unit 50 can be reinforced by the lean hose 61, and the collision of the vehicle loaded with the battery unit 50 Sometimes, the lean hose 61 can protect the battery stack 1. Moreover, since the resin-made inner resin holders 63 having insulating properties are disposed between the battery stacks 1 adjacent in the Y direction, a short circuit due to contact of the battery cells 10 adjacent in the Y direction can be reliably prevented.

  The present invention is not limited to the above-described embodiment and its modifications, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent ranges.

  For example, in the above embodiment, one leaf spring 3 is provided for each battery cell 10, but two or more leaf springs may be provided below at least one battery cell 10. Alternatively, one leaf spring may be provided for each battery stack, and may have a length in the X direction that is substantially the same as the length in the X direction of the battery stack. Also, flat pressed portions 62a, 63 are provided at the upper end portions of the resin holders 62, 63, and flat plate portions 61a, 61b for pressing the pressed portions 62a, 63 downward are provided on the lean hose 61. There is no need to provide a flat pressed portion at the upper end of the resin holder, and it is not necessary to provide a flat plate also on the lean hose. Moreover, although the insulation heat insulation sheet 8 was arrange | positioned between the battery cell 10 and the water jacket 25, an insulation heat insulation sheet is not interposed between a battery cell and a water jacket, but a battery cell is made to contact a water jacket directly. Also good. Moreover, although the both ends of the leaf | plate spring 3 have been arrange | positioned in the heat insulation sheet 55 of a cross-sectional substantially U shape, it is not necessary to arrange | position the both ends of a leaf | plate spring in the heat insulation sheet of a cross-sectional substantially U shape. Further, although the pressing member 6 includes the lean hose 61, the end side resin holder 62, and the inner side resin holder 63 which are separate from each other, the pressing member is an integrally configured (molded) lean hose, end side resin holder. And an inner resin holder. Moreover, although the metal leaf | plate spring 3 was employ | adopted as an urging | biasing member, the urging | biasing member may be a leaf | plate spring comprised with the materials (for example, rubber | gum) which have restoring forces other than a metal. Alternatively, the urging member may be composed of a spring other than the leaf spring, and may be composed of, for example, a coil spring. Alternatively, the urging member may be formed of an elastic member (for example, a rubber member) that generates a restoring force when compressed.

  DESCRIPTION OF SYMBOLS 1 Battery stack, 2 Cooler, 3 Leaf spring, 5 Battery pack case, 6 Holding member, 10 Battery cell, 25 Water jacket, 50 Battery unit, 61 Lean hose, 62 End side resin holder, 63 Inner resin boulder

Claims (1)

A battery cell;
A cooler provided below the battery cell;
An urging member that presses the cooler against the battery cell;
A battery pack case in which the battery cell, the cooler and the biasing member are stored;
A battery unit, comprising: a pressing member attached to the battery pack case and pressing the battery cell from above so that the battery cell does not move upward.

Images