Temperature detection module and conductive module

Abstract

To limit the increase in physical size. [Solution] The flexible printed circuit board 20 has a main line 21 and a plurality of branch lines 22, an annular heat conductive member 30 with one annular surface 30a attached to one plane 22a of a branch line, a temperature sensor 40 mounted on one plane of a branch line within the ring 30c of the heat conductive member, and a cover member 50 molded from a synthetic resin material harder than elastomer and synthetic rubber to cover the flexible printed circuit board. The flexible printed circuit board has circuit conductors for each temperature sensor to electrically connect the temperature sensor to the battery monitoring unit, and the cover member has a cover body 51 with a flat plate portion 51a that covers the main line, and a cantilever-shaped arm portion 52 that is flexible and deformable and branches off from the cover body for each branch line, and the arm portion applies a reaction force toward the cell body due to the flexural deformation to the heat conductive member from the free end side, pressing the other annular surface 30b of the heat conductive member against the cell body.

Description

Technical Field

[0001] The present invention relates to a temperature detection module and a conductive module.

Background Art

[0002] Conventionally, in vehicles such as electric vehicles, a battery pack for supplying power to a rotating machine as a drive source is mounted. The battery pack includes a battery module in which a plurality of battery cells are arranged, and a conductive module that electrically connects each battery cell and sends the battery state (voltage information, temperature information, etc.) of each battery cell to a battery monitoring unit. The temperature detection module is responsible for the temperature detection function of the conductive module, and electrically connects a temperature sensor to the battery monitoring unit via a flexible printed circuit board. For example, the temperature detection module is disclosed in Patent Documents 1 and 2 below. In the temperature detection module of Patent Document 1, a flexible printed circuit board is covered with a cover formed of an elastic member such as synthetic rubber, and the temperature sensor is pressed against the battery cell side by a protruding portion of the cover. That is, in the temperature detection module of Patent Document 1, the elastic force generated by shrinking the protruding portion is used as a pressing force for pressing the temperature sensor against the battery cell side. In the temperature detection module of Patent Document 2, a temperature sensor is assembled to a cover covering the flexible printed circuit board, and a pair of flexible arms of the temperature sensor are bent and deformed between the cover and the battery cell, and the sensor body of the temperature sensor is pressed against the battery cell by the pressing force generated along with the bending deformation.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, conventional temperature detection modules require protrusions or a pair of flexible arms to extend in the direction in which the pressing force is generated in order to generate a pressing force of the desired magnitude, which may lead to an increase in size in the direction in which the pressing force is generated.

[0005] Therefore, the object of the present invention is to provide a temperature detection module and a conductive module that can suppress an increase in size. [Means for solving the problem]

[0006] The temperature detection module according to the present invention comprises a flexible printed circuit board having a flat main line and branch lines branching off from the main line at multiple locations, an annular heat conductive member for each branch line with one annular surface attached to one plane of the branch line, a temperature sensor for each heat conductive member mounted on one plane of the branch line within the annular heat conductive member and detecting the temperature of the cell body of the battery cell, and a cover member molded from a synthetic resin material harder than elastomer and synthetic rubber and covering the flexible printed circuit board, and the flexible The printed circuit board is equipped with circuit conductors for each temperature sensor that electrically connect the temperature sensor to a battery monitoring unit that monitors the battery state of the battery cell, and the cover member has a cover body provided with a flat plate portion that covers the main line, and a cantilever-shaped arm portion that is flexible and deformable, branching out from the cover body for each of the branch lines, wherein the arm portion applies a reaction force toward the cell body due to the flexural deformation to the heat conductive member from the free end side, and presses the other annular surface of the heat conductive member against the cell body.

[0007] The conductive module according to the present invention includes: a busbar that physically and electrically connects to the electrode terminals of one or a pair of battery cells in a battery module in which a plurality of battery cells are arranged; a flexible printed circuit board that electrically connects the busbar to a battery monitoring unit that monitors the battery state of the battery cells and has a flat main line and branch lines that branch off from the main line at multiple locations; an annular heat conductive member for each branch line, with one annular surface assembled to one of the planes of the branch line; a temperature sensor for each heat conductive member that is mounted on one of the planes of the branch line within the ring of the heat conductive member and detects the temperature of the cell body of the battery cell; and a molded from a synthetic resin material that is harder than elastomer and synthetic rubber. The flexible printed circuit board comprises a cover member that covers the flexible printed circuit board, the flexible printed circuit board comprising a first circuit conductor for each busbar that electrically connects the busbar to the battery monitoring unit, and a second circuit conductor for each temperature sensor that electrically connects the temperature sensor to the battery monitoring unit, the cover member comprising a cover body provided with a flat plate portion that covers the main line, and a cantilever-shaped arm portion that is flexible and deformable, branching out from the cover body for each branch line, wherein the arm portion applies a reaction force toward the cell body due to the flexural deformation to the heat conductive member from the free end side, and presses the other annular surface of the heat conductive member against the cell body. [Effects of the Invention]

[0008] The temperature detection module and conductive module according to the present invention utilize the spring properties of a flexible arm portion provided as part of the cover member to press the other annular surface of the heat conduction member against the cell body. Therefore, the temperature detection module and conductive module according to the present invention can press the other annular surface of the heat conduction member against the cell body without providing a dedicated structure for pressing the heat conduction member against the cell body, thus suppressing an increase in size in the pressing direction. Furthermore, when using a cover member molded from elastomer or synthetic rubber, it is necessary to provide a protrusion or the like with a size that can apply a compressive load in the opposite direction to the pressing direction in order to give the cover member the same pressing function as the arm portion. On the other hand, since the temperature detection module and conductive module according to the present invention use a cover member made of a harder synthetic resin than such soft elastomer or synthetic rubber, even if the arm portion is smaller than the protrusion or the like in the pressing direction, the other annular surface of the heat conduction member can be pressed against the cell body, thus suppressing an increase in size in the pressing direction. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is an exploded perspective view showing the temperature detection module and conductive module of the embodiment. [Figure 2] Figure 2 is a plan view showing the temperature detection module and conductive module of the embodiment. [Figure 3] Figure 3 is a cross-sectional view along line XX in Figure 2. [Figure 4] Figure 4 is an explanatory diagram illustrating the battery module. [Figure 5] Figure 5 is an exploded perspective view showing the temperature detection module and conductive module of a modified example. [Figure 6] Figure 6 is a plan view showing a modified temperature detection module and a conductive module. [Figure 7] Figure 7 is a cross-sectional view taken along line XX in Figure 6. [Figure 8] Figure 8 is a cross-sectional view along the YY line in Figure 6. [Modes for carrying out the invention]

[0010] Embodiments of the temperature detection module and conductive module according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to these embodiments.

[0011] [Embodiment] One embodiment of the temperature detection module and conductive module according to the present invention will be described with reference to Figures 1 to 4.

[0012] Reference numeral 1 in Figures 1 to 3 indicates a conductive module of this embodiment. This conductive module 1 is assembled into a battery module BM (Figure 4) in which multiple battery cells BC are arranged (for example, arranged in a single row), and electrically connects the multiple battery cells BC in this battery module BM. Furthermore, this conductive module 1 electrically connects the battery module BM to a battery monitoring unit (not shown), allowing the battery monitoring unit to monitor the battery status (voltage, temperature, etc.) of the detected battery cells BC. This conductive module 1, together with the battery module BM, constitutes a battery pack. A battery pack is, for example, mounted in a vehicle (BEV: Battery Electric Vehicle, HEV: Hybrid Electric Vehicle, etc.) that is equipped with a rotating machine as a power source, and is used to supply power to that rotating machine. Note that the battery module BM in the figures is a portion of multiple battery cells BC extracted.

[0013] Thus, the conductive module 1 is responsible for the electrical connection function of multiple battery cells BC and the function of detecting the battery state of the battery cells BC. Furthermore, this conductive module 1 includes a temperature detection module 1A that is responsible for the temperature detection function of the battery cells BC.

[0014] The battery cell BC includes a cell body BCa and electrode terminals BCb for positive and negative electrodes respectively (Fig. 4). The battery cell BC shown here is formed in a cubic shape in which the cell body BCa has six outer wall surfaces. And in the plurality of battery cells BC constituting the battery module BM, the adjacent cell bodies BCa in the arrangement direction are arranged with one outer wall surface facing each other. This battery module BM includes one electrode terminal group BCc in which one electrode terminal BCb in each battery cell BC is arranged along the arrangement direction, and the other electrode terminal group BCd in which the other electrode terminal BCb in each battery cell BC is arranged along the arrangement direction (Fig. 4).

[0015] When the term "arrangement direction" is used without special mention hereinafter, it refers to the arrangement direction of the plurality of battery cells BC and the arrangement direction of the plurality of electrode terminals BCb in the electrode terminal groups BCc and BCd.

[0016] In this example, each battery cell BC includes electrode terminals BCb for positive and negative electrodes respectively on one of the six outer wall surfaces of the cell body BCa (Fig. 4). Therefore, in the battery module BM, two electrode terminal groups BCc and BCd are provided on one plane (Fig. 4).

[0017] Also, the electrode terminal BCb shown here is formed in a flat plate shape, and is to be physically and electrically connected to the bus bar 10 described later by welding or the like (Fig. 4). However, the electrode terminal BCb may be formed in a stud shape having a male screw portion. In this case, the bus bar 10 is fixed to the electrode terminal BCb by screwing a female screw member onto the male screw portion of the electrode terminal BCb.

[0018] The conductive module 1 includes a bus bar 10 (Fig. 4). Also, the conductive module 1 and the temperature detection module 1A include a flexible printed circuit board (FPC) 20, an annular heat conduction member 30, a temperature sensor 40 for detecting the temperature of the cell body BCa of the battery cell BC, and a cover member 50 for covering the flexible printed circuit board 20 (Figs. 1 to 3). The heat conduction member 30 and the temperature sensor 40 are provided for each of the plurality of branch lines 22 described later.

[0019] The bus bar 10 is physically and electrically connected to the electrode terminals BCb of one or a pair of battery cells BC in the battery module BM. Therefore, this bus bar 10 is formed of a conductive material such as metal. The bus bar 10 is a plate-shaped conductive component made of metal, and is press-formed using, for example, a metal plate as the base material. The bus bar 10 shown here is formed in a rectangular flat plate shape and is physically and electrically connected to the electrode terminal BCb by laser welding.

[0020] As the bus bar 10, there are those that are physically and electrically connected to one electrode terminal BCb that serves as the total negative electrode in the battery module BM, and those that are physically and electrically connected to one electrode terminal BCb that serves as the total positive electrode in the battery module BM. Also, as the bus bar 10, there is one that is physically and electrically connected to the electrode terminals BCb adjacent to each other in the arrangement direction of a pair of battery cells BC in the battery module BM.

[0021] The flexible printed circuit board 20 electrically connects between the bus bar 10 and the battery monitoring unit, and also electrically connects between the temperature sensor 40 and the battery monitoring unit. Therefore, this flexible printed circuit board 20 includes circuit conductors for each bus bar 10 that electrically connect the bus bar 10 to the battery monitoring unit (hereinafter referred to as "first circuit conductors"), and circuit conductors for each temperature sensor 40 that electrically connect the temperature sensor 40 to the battery monitoring unit (hereinafter referred to as "second circuit conductors") (not shown in the figure).

[0022] In this flexible printed circuit board 20, the first and second circuit conductors are formed by a conductive pattern such as copper foil. This flexible printed circuit board 20 is equipped with various films (base film and cover film) that are formed flat and flexible as an insulating coating, and the conductive pattern is formed on at least one of these films (base film). The conductive pattern (first circuit conductor, second circuit conductor) is enclosed by the insulating coating, and locations that serve as electrical contacts with other components are exposed, for example.

[0023] The flexible printed circuit board 20 has a flat main line 21 and branch lines 22 that branch off from the main line 21 at multiple locations (Figures 1 and 3). For example, the main line 21 is formed in the shape of a rectangular flat plate extending in the direction of arrangement. This main line 21 is provided for each electrode terminal group BCc, BCd, and branches off branch lines 22 towards the cell body BCa at multiple locations. The branch lines 22 do not necessarily need to be provided for each battery cell BC, and the number may be less than the total number of battery cells BC. The branch lines 22 shown here are formed in the shape of an L-shaped cantilever beam with two ends perpendicular to each other and the free end end extending in the direction of arrangement.

[0024] A heat conduction member 30 is provided for each branch line 22. This heat conduction member 30 has one annular surface 30a attached to one plane 22a of the branch line 22, and the other annular surface 30b in contact with the cell body BCa (Figures 1 and 3). As a result, this heat conduction member 30 receives heat from the cell body BCa, dissipates that heat into the ring 30c, and transmits it to the branch line 22. Therefore, the heat conduction member 30 is made of a metal material with high thermal conductivity (for example, copper). The heat conduction member 30 shown here is formed in the shape of a rectangular annular and flat plate. This heat conduction member 30 is attached to the free end of one plane 22a of the branch line 22.

[0025] A temperature sensor 40 is provided for each heat conduction member 30. This temperature sensor 40 is mounted on one of the planes 22a of the branch line 22 within the ring 30c of the heat conduction member 30. Here, the second circuit conductor is exposed at the free end of one of the planes 22a of the branch line 22, and the temperature sensor 40 is physically and electrically connected to this second circuit conductor by soldering or the like. The temperature sensor 40 shown here is a chip thermistor.

[0026] As previously shown, the heat conductive member 30 dissipates the heat received from the cell body BCa into the ring-shaped cavity 30c and also transmits it to the branch wire 22. Then, the heat from the cell body BCa and the heat from the branch wire 22 are also dissipated into the ring-shaped cavity 30c. The ambient temperature of the temperature sensor 40 in this ring-shaped cavity 30c corresponds to the heat from the ring-shaped cavity 30c and the heat from the branch wire 22. Therefore, the temperature sensor 40 shown here detects the temperature corresponding to the heat from the ring-shaped cavity 30c and the heat from the branch wire 22 as the temperature of the cell body BCa.

[0027] The cover member 50 is molded from an insulating synthetic resin material. The cover member 50 shown here is molded from a synthetic resin material that is harder than elastomer and synthetic rubber. This cover member 50 has a cover body 51 provided with a flat plate portion 51a that covers the main line 21, and a cantilever-shaped arm portion 52 that is flexible and deformable, branching out from the cover body 51 for each branch line 22 (Figures 1 to 3). This cover member 50 is assembled to, for example, a battery module BM with the planes of the main line 21 and the flat plate portion 51a parallel to each other.

[0028] The arm portion 52 applies a reaction force toward the cell body BCa due to the bending deformation to the heat conductive member 30 from the free end side, pressing the other annular surface 30b of the heat conductive member 30 against the cell body BCa. For example, the arm portion 52 has a first piece portion 52a protruding from the cover body 51, and a second piece portion 52b on the free end side that protrudes parallel to the flat plate portion 51a from the first piece portion 52a and applies a reaction force toward the cell body BCa due to the bending deformation to the other plane 22b of the branch line 22 (Figures 1 and 3).

[0029] In this arm portion 52, for example, as the cover member 50 is assembled to the battery module BM with the heat conduction member 30 placed on the cell body BCa, the second piece portion 52b comes into contact with the other plane 22b of the branch line 22. Then, in this arm portion 52, as the assembly operation of the cover member 50 is advanced to the position where it is completed to the battery module BM, the force received by the second piece portion 52b from the other plane 22b of the branch line 22 causes the first piece portion 52a to bend and deform. As a result, in this arm portion 52, the reaction force accompanying this bending deformation acts from the second piece portion 52b to the other plane 22b of the branch line 22 as a force directed toward the cell body BCa. Therefore, this arm portion 52 presses the other annular surface 30b of the heat conduction member 30 against the cell body BCa.

[0030] As described above, the conductive module 1 and temperature detection module 1A of this embodiment utilize the spring properties of a flexible arm portion 52 provided as part of the cover member 50 to press the other annular surface 30b of the heat conductive member 30 against the cell body BCa. Therefore, the conductive module 1 and temperature detection module 1A of this embodiment can press the other annular surface 30b of the heat conductive member 30 against the cell body BCa without providing a dedicated structure for pressing the heat conductive member 30 against the cell body BCa, thus suppressing an increase in size in the pressing direction.

[0031] Furthermore, when using a cover member molded from elastomer or synthetic rubber, it is necessary to provide a protrusion or the like that has a size sufficient to apply a compressive load in the opposite direction to the pressing direction in order to give the cover member the same pressing function as the arm portion 52. On the other hand, the conductive module 1 and temperature detection module 1A of this embodiment use a cover member 50 made of synthetic resin which is harder than such soft elastomer and synthetic rubber, so even if the arm portion 52 is smaller than the protrusion or the like in the pressing direction, the other annular surface 30b of the heat conductive member 30 can be pressed against the cell body BCa, and an increase in size in the pressing direction can be suppressed.

[0032] Furthermore, the conductive module 1 and temperature detection module 1A of this embodiment can make the arm portion 52 follow thermal expansion and contraction of the battery cell BC, so that the other annular surface 30b of the heat conductive member 30 can be pressed against the cell body BCa by the arm portion 52. In addition, the conductive module 1 and temperature detection module 1A of this embodiment can make the arm portion 52 follow tolerance variations of the battery cell BC and assembly tolerance variations between each battery cell BC, so that the other annular surface 30b of the heat conductive member 30 can be pressed against the cell body BCa by the arm portion 52. Furthermore, even if a misalignment occurs between the conductive module 1 and temperature detection module 1A of this embodiment due to the effects of vibrations during vehicle operation, the conductive module 1 and temperature detection module 1A of this embodiment can make the arm portion 52 follow that misalignment, so that the other annular surface 30b of the heat conductive member 30 can be pressed against the cell body BCa by the arm portion 52.

[0033] Furthermore, in this embodiment, the conductive module 1 and temperature detection module 1A have the arm portion 52 as part of the cover member 50, which makes it possible to reduce the number of parts.

[0034] [Example 1] The conductive module 2 of this modified example is the conductive module 1 of the embodiment described above, in which the heat conductive member 30 and cover member 50 are replaced with the heat conductive member 130 and cover member 150 described below (Figures 5 to 8). The temperature detection module 2A of this modified example is the temperature detection module 1A of the embodiment described above, in which the heat conductive member 30 and cover member 50 are replaced with the heat conductive member 130 and cover member 150 described below (Figures 5 to 8). Therefore, in this modified example, the same reference numerals are used for the same components and parts as in the embodiment of the conductive module 1 and temperature detection module 1A, and their descriptions are omitted.

[0035] The heat conductive member 130 of this modified example has an annular body 131 formed in an annular shape and a pair of protrusions 132 projecting in opposite directions from the annular body 131 (Figures 5, 7, and 8). The heat conductive member 130 is formed from a metal material with high thermal conductivity (for example, copper), similar to the heat conductive member 30 of the embodiment.

[0036] The annular body 131, in the same way as the heat conductive member 30 of the embodiment, has one annular surface 131a attached to one plane 22a of the branch line 22, and the other annular surface 131b in contact with the cell body BCa, thereby receiving heat from the cell body BCa, dissipating that heat into the ring 131c, and transmitting it to the branch line 22 (Figures 5 to 8). The annular body 131 shown here is an angular annular shape and is formed in a flat plate shape, similar to the heat conductive member 30 of the embodiment.

[0037] The pair of protrusions 132 are parallel to the respective annular surfaces 131a and 131b of the annular body 131 and protrude in opposite directions. The pair of protrusions 132 shown here are formed in a rectangular halve shape having a plane that lies on the same plane as one of the annular surfaces 131a.

[0038] The cover member 150 in this modified example is molded from a synthetic resin material that is harder than elastomer and synthetic rubber, similar to the cover member 50 in the embodiment.

[0039] The cover member 150 of this modified example has a cover body 151 with a flat plate portion 151a that covers the main line 21, similar to the cover member 50 of the embodiment (Figures 5 to 8). On the other hand, the cover member 150 of this modified example has a cantilever-shaped arm portion 152 that is branched from the cover body 151 for each branch line 22, similar to the cover member 50 of the embodiment, but the arm portion 152 is provided for each protrusion 132 of the heat conduction member 130 (Figures 5 to 8).

[0040] The arm portion 152 of this modified example has a piece portion 152a that protrudes from the cover body 151, and a free-end holding portion 152b that protrudes parallel to the flat plate portion 151a from the piece portion 152a and holds the protruding portion 132, applying a reaction force toward the cell body BCa due to the bending deformation of the protruding portion 132 (Figures 5 to 8). The holding portion 152b shown here has a holding groove 152c into which the protruding portion 132 is fitted (Figures 5, 7 and 8). Thus, the pair of arm portions 152 of this modified example apply a reaction force toward the cell body BCa due to the bending deformation from the free-end holding portion 152b to the protruding portion 132 of the heat conductive member 130, thereby pressing the other annular surface 131b of the annular body 131 of the heat conductive member 130 against the cell body BCa.

[0041] In the pair of arm portions 152 of this modified example, when the cover member 150 is in the completed assembly position with respect to the battery module BM, the force received by the cell body BCa on the other annular surface 131b of the annular body 131 causes the single portion 152a to bend and deform via the protrusion 132. In the pair of arm portions 152 of this modified example, at this completed assembly position, a reaction force accompanying this bending deformation acts on the protrusion 132, and this reaction force presses the other annular surface 131b of the annular body 131 against the cell body BCa.

[0042] As described above, the conductive module 2 and temperature detection module 2A of this embodiment, like the conductive module 1 and temperature detection module 1A of the embodiment, utilize the spring properties of a pair of flexible arm portions 152 provided as part of the cover member 150 to press the other annular surface 131b of the annular body 131 of the heat conductive member 130 against the cell body BCa. Therefore, the conductive module 2 and temperature detection module 2A of this embodiment, like the conductive module 1 and temperature detection module 1A of the embodiment, can press the other annular surface 131b of the heat conductive member 130 against the cell body BCa without providing a dedicated structure for pressing the heat conductive member 130 against the cell body BCa, thus suppressing an increase in size in the pressing direction.

[0043] Furthermore, the conductive module 2 and temperature detection module 2A of this embodiment, like the conductive module 1 and temperature detection module 1A of the embodiment, use a cover member 150 made of a synthetic resin that is harder than soft elastomer and synthetic rubber, so that the size of the heat conductive member 130 in the direction of pressing against the cell body BCa can be suppressed.

[0044] Furthermore, the conductive module 2 and temperature detection module 2A of this embodiment, like the conductive module 1 and temperature detection module 1A of the embodiment, can make the pair of arm portions 152 follow thermal expansion and contraction of the battery cell BC, so that the other annular surface 131b of the heat conductive member 130 can be pressed against the cell body BCa with these arm portions 152. In addition, the conductive module 2 and temperature detection module 2A of this embodiment, like the conductive module 1 and temperature detection module 1A of the embodiment, can also make the pair of arm portions 152 follow tolerance variations in the battery cell BC and assembly tolerance variations between each battery cell BC, so that the other annular surface 131b of the heat conductive member 130 can be pressed against the cell body BCa with these arm portions 152. Furthermore, in this embodiment, the conductive module 2 and temperature detection module 2A, like the conductive module 1 and temperature detection module 1A of the embodiment, can, even if a misalignment occurs between them and the battery cell BC due to vibrations during vehicle operation, have their pair of arm portions 152 follow the misalignment, and these pair of arm portions 152 can press the other annular surface 131b of the heat conductive member 130 against the cell body BCa.

[0045] Furthermore, the conductive module 2 and temperature detection module 2A of this embodiment, like the conductive module 1 and temperature detection module 1A of the embodiment, have a pair of arm portions 152 provided as part of the cover member 150, thus enabling a reduction in the number of parts. [Explanation of Symbols]

[0046] 1,2 Conductive Modules 1A, 2A Temperature Detection Module 10 Busba 20 Flexible Printed Circuit Boards 21 Main line 22 Branch Line 22a One plane 22b The other plane 30,130 Heat conductive material 30a, 131a One annular surface 30b, 131b The other annular surface 30c,131c within the ring 40 Temperature Sensors 50,150 Cover component 51,151 Cover body 51a,151a Flat plate part 52,152 Arm section 52a 1st piece 52b Second section 132 Protrusion 152a Katabe 152b Holding part BC battery cell BCa cell body BCb electrode terminal BM Battery Module

Claims

1. A flexible printed circuit board having a flat main line and branch lines branching off from the main line at multiple locations, An annular heat conductive member for each branch line, wherein one annular surface is assembled to one of the planes of the branch line, A temperature sensor for each heat conductive member is mounted on one of the planes of the branch line within the ring of the heat conductive member and detects the temperature of the cell body of the battery cell, A cover member that covers the flexible printed circuit board, molded from a synthetic resin material that is harder than elastomers and synthetic rubber, Equipped with, The flexible printed circuit board includes a circuit conductor for each temperature sensor that electrically connects the temperature sensor to a battery monitoring unit that monitors the battery state of the battery cell, The cover member comprises a cover body provided with a flat plate portion that covers the main line, and a cantilever-shaped arm portion that is flexible and deformable, branching off from the cover body for each of the branch lines. The temperature detection module is characterized in that the arm portion applies a reaction force toward the cell body due to bending deformation to the heat conducting member from the free end side, pressing the other annular surface of the heat conducting member against the cell body.

2. The temperature detection module according to claim 1, characterized in that the arm portion has a first piece portion protruding from the cover body and a second piece portion on the free end side that protrudes parallel to the flat plate portion from the first piece portion and applies the reaction force to the other plane of the branch line.

3. The heat conducting member has a pair of protrusions that are parallel to each of the annular surfaces and protrude in opposite directions from one another. The cover member is provided with the arm portion for each of the protruding portions. The temperature detection module according to claim 1, characterized in that the arm portion has a piece portion that protrudes from the cover body and a free-end holding portion that protrudes from the piece portion parallel to the flat plate portion and holds the protruding portion and applies the reaction force to the protruding portion.

4. The temperature detection module according to claim 1, 2, or 3, characterized in that the temperature sensor is a chip thermistor and detects the temperature corresponding to the heat in the ring of the heat conductive member and the heat of the branch line as the temperature of the cell body.

5. A busbar that is physically and electrically connected to the electrode terminals of one or a pair of battery cells in a battery module in which multiple battery cells are arranged, A flexible printed circuit board is electrically connected to a battery monitoring unit that monitors the battery state of the battery cell and the busbar, and has a flat main line and branch lines that branch off from the main line at multiple locations. An annular heat conductive member for each branch line, wherein one annular surface is assembled to one of the planes of the branch line, A temperature sensor for each heat conductive member is mounted on one of the planes of the branch line within the ring of the heat conductive member and detects the temperature of the cell body of the battery cell, A cover member that covers the flexible printed circuit board, molded from a synthetic resin material that is harder than elastomers and synthetic rubber, Equipped with, The flexible printed circuit board comprises a first circuit conductor for each busbar that electrically connects the busbar to the battery monitoring unit, and a second circuit conductor for each temperature sensor that electrically connects the temperature sensor to the battery monitoring unit. The cover member comprises a cover body provided with a flat plate portion that covers the main line, and a cantilever-shaped arm portion that is flexible and deformable, branching off from the cover body for each of the branch lines. The aforementioned arm portion is a conductive module characterized by acting a reaction force toward the cell body due to bending deformation onto the heat conductive member from the free end side, thereby pressing the other annular surface of the heat conductive member against the cell body.

Images