Clamp for battery test

Abstract

The present invention provides a clamp for testing a battery. The clamp comprises: a main body part having a concave surface corresponding to the shape of a battery (C); and a cover body having a concave surface corresponding to the shape of the battery (C) and sandwiching the battery (C) between the concave surface and the concave surface of the main body part. The main body section has a flow path through which a heat medium for adjusting the temperature of the battery (C) flows. Accordingly, the battery test can be performed in a state in which the temperature of the battery is more accurately and easily controlled.

Description

Technical Field

[0001] The invention relates to a battery testing fixture. Background Art

[0002] Conventionally, there is known a test device that adjusts the ambient temperature of the battery to a specified temperature and then performs a charge and discharge test on the battery. This test device has a constant temperature box that forms a specified temperature environment. With the battery arranged in the constant temperature box, the test device controls the ambient temperature of the battery to a specified temperature. Then, a battery test such as a charge and discharge test is performed in the specified temperature environment.

[0003] However, when a battery test is performed in a thermostatic chamber as disclosed in Japanese Patent Publication No. 2013-164297, although the air temperature around the battery is controlled, the battery test is not necessarily performed while the battery temperature is maintained at a specified temperature. In other words, the battery temperature may change when power is supplied to the battery, so the battery test is not necessarily performed while the battery temperature is maintained at a required specified temperature. Summary of the invention

[0004] An object of the present invention is to provide a battery test jig capable of performing a battery test in a state where the temperature of the battery can be more accurately and easily controlled.

[0005] A battery test jig according to one aspect of the present invention includes: a main body having a concave surface corresponding to the shape of a battery; and a cover having a concave surface corresponding to the shape of the battery and sandwiching the battery between the concave surface and the concave surface of the main body. The main body has a flow channel for circulating a heat medium for adjusting the temperature of the battery.

[0006] According to the present invention, a battery test can be performed in a state where the temperature of the battery can be more accurately and easily controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a perspective view of a battery test jig according to the embodiment.

[0008] Figure 2 It is a cross-sectional view of the battery testing jig when viewed from above.

[0009] Figure 3 This is a diagram showing a modified example in which the flow channel is offset from the extension line of the internal thread portion and the protrusion and the recess are omitted.

[0010] Figure 4 This is a diagram showing a modified example in which the flow channel is located on the extension line of the internal thread portion and the protrusion and the recess are omitted.

[0011] Figure 5It means in Figure 4 FIG. 2 is a diagram of a modified example in which the flow channel is arranged on the back side of the main body side concave surface in the opposing direction in the modified example.

[0012] Figure 6 It is a diagram showing a modified example in which a plurality of battery holding portions are provided.

[0013] Figure 7 It means in Figure 6 A diagram of a modified example in which a temperature adjustment unit is provided in the modified example.

[0014] Figure 8 It means in Figure 6 FIG. 2 is a diagram of a modified example in which a temperature adjustment unit is provided for each battery holding unit in a modified example of .

[0015] Fig. 9 It is a figure which shows the battery test jig for holding a rectangular battery.

[0016] Fig.10 It is a diagram showing a battery test jig for holding a stacked battery. DETAILED DESCRIPTION

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0018] The battery test fixture according to this embodiment is used to maintain the battery at a specified temperature while holding the battery at a specified position during a battery test such as a charge and discharge test. Figure 1 and Figure 2 As shown, the battery test jig 10 includes: a main body 11 formed of an integral member (e.g., metal); a cover 12 formed of an integral member (e.g., metal); and a fastening portion 13 for fixing the cover 12 to the main body 11. The main body 11 and the cover 12 are respectively formed of solid members.

[0019] The battery C is held by being sandwiched between a concave surface (main body side concave surface 17) formed in the main body 11 and a concave surface (cover side concave surface 18) formed in the cover 12. That is, the main body side concave surface 17 is formed on the surface (main body side facing surface 19) of the main body 11 facing the cover 12, and the cover side concave surface 18 is formed on the surface (cover side facing surface 20) of the cover 12 facing the main body 11. And, by making the main body side facing surface 19 and the cover side facing surface 20 face each other, the battery holding portion 22 is formed by the main body side concave surface 17 and the cover side concave surface 18.

[0020] The body side concave surface 17 and the cover side concave surface 18 have a concave shape corresponding to the shape of the battery C to be held. In the example, the battery C has a circular cross-section when viewed from above, so the body side concave surface 17 and the cover side concave surface 18 are concave arc shapes when viewed from above. Figure 1 A main body side concave surface 17 and a cover side concave surface 18 are formed in a range from one end to the other end (in the up-down direction).

[0021] In addition, both the main body side concave surface 17 and the cover side concave surface 18 are formed by semicircular arcs, so the main body side facing surface 19 and the cover side facing surface 20 are separated by an imaginary plane P ( Figure 2 ) and facing each other.

[0022] The body side facing surface 19 and the cover side facing surface 20 are in contact with the side surface of the battery C directly or via a heat transfer sheet not shown. On the other hand, the body side facing surface 19 and the cover side facing surface 20 may be in contact with each other directly or via a heat transfer sheet not shown, or may be spaced apart from each other.

[0023] The fastening portion 13 is provided to fix the cover 12 to the main body 11. The fastening portion 13 includes, for example, a plurality of fasteners (a plurality of bolts 13a), and the threaded portion of each bolt 13a is screwed into a corresponding internal threaded portion 24 formed on the main body 11. The internal threaded portion 24 is provided on both sides of the main body side concave surface 17 so as to extend from the main body side facing surface 19 in a direction perpendicular to the facing surface 19.

[0024] In addition, the internal thread portion 24 is provided at two locations in the vertical direction in the example of the figure, but is not limited thereto, and may be provided at one location in the center in the vertical direction, or may be provided at three or more locations in the vertical direction.

[0025] The bolt 13a is inserted into the through hole 26 formed in the cover 12. The bolt 13a is screwed into the internal thread portion 24 of the main body 11 while being inserted into the through hole 26 of the cover 12. Thus, the cover 12 is positioned on the main body 11.

[0026] An elastic body 30 is sandwiched between the head 13b of the bolt 13a and the cover body 12. The elastic body 30 is formed by a coil spring that is compressed as the bolt 13a is tightened to the internal thread portion 24. The cover body 12 is pressed toward the main body 11 by the coil spring being in a compressed state. As a result, the main body side concave surface 17 and the cover side concave surface 18 are pressed toward the battery C. On the other hand, when the battery C expands during the battery test, the cover body 12 is pushed by the battery C in a direction away from the main body 11. Therefore, in this case, the elastic body 30 is compressed and the cover body 12 is displaced. That is, the elastic body 30 is configured to allow the cover body 12 to be displaced in a direction away from the main body 11 due to the expansion of the battery C. In addition, the elastic body 30 is not limited to a coil spring.

[0027] The cover 12 is provided with a temporary fixing member 32. The temporary fixing member 32 is a member for temporarily fixing the cover 12 to the main body 11 before the cover 12 is fixed to the main body 11 by the fastening portion 13. By hanging the temporary fixing member 32 on the protrusion 33 ( Figure 1 ), the cover 12 can be held at a specified position relative to the main body 11 before the bolts 13a are tightened.

[0028] The main body 11 is provided with a flow passage 35 through which a heat medium for adjusting the temperature of the battery (C) flows. The flow passage 35 is thermally connected to the members constituting the main body 11. Therefore, by flowing a heat medium (e.g., cooling water, salt water, warm water) supplied from a heat medium source (not shown) through the flow passage 35, the main body 11 can be maintained at a predetermined temperature.

[0029] The flow passage 35 protrudes from one end face and the other end face of the main body 11, and is configured to be connected to a pipe (not shown) connected to a heat medium source. Therefore, the main body 11 is connected to the pipe and is arranged at a specified position in a state supported by the pipe. And, by attaching the cover 12 to the main body 11 arranged at the specified position, the battery C is held by the battery test jig 10.

[0030] The flow passage 35 includes a pair of flow portions 35a, which are perpendicular to the direction in which the main body 11 and the cover 12 face each other (facing direction) and the direction in which the main body side concave surface 17 extends (in the direction in which the main body side concave surface 17 extends). Figure 1 The directions of each direction (in Figure 2 In other words, the circulation passage 35 includes a pair of circulation portions 35a, and each circulation portion 35a is arranged on the opposite sides of the main body side concave surface 17. Therefore, it is possible to prevent the heat transfer to the battery C from being uneven in the left-right direction of the battery C.

[0031] The flow passage 35 (each flow portion 35a) extends in the direction in which the main body side concave surface 17 extends (in the Figure 1 That is, since the heat medium supplied from the heat medium source flows straightly in one direction, the heat medium can flow easily.

[0032] In addition, if Figure 2 As shown, the circulation channel 35 (each circulation portion 35a) extends in a direction perpendicular to the main body side concave surface 17 (in Figure 1 In the cross section (in the vertical direction), from the direction perpendicular to the opposite direction (in Figure 2 When viewed in the left-right direction, a portion of the circulation channel 35 (each circulation portion 35a) is arranged at a position overlapping with the main body side concave surface 17. That is, the circulation channel 35 (each circulation portion 35a) extends from the main body side concave surface 17 to the opposite direction (in the left-right direction). Figure 2 Since the circulation channel 35 (each circulation portion 35a) is arranged at this position, it is possible to suppress the enlargement of the main body 11 in order to form the circulation channel 35. In addition, when viewed from a direction perpendicular to the opposing direction, the circulation channel 35 (each circulation portion 35a) may be arranged at a position where the entire circulation channel 35 (each circulation portion 35a) overlaps with the main body side concave surface 17.

[0033] The circulation channel 35 (each circulation portion 35a) is located at a position passing through the extension line of the internal thread portion 24. Since the circulation channel 35 (each circulation portion 35a) is set at a position not too far from the main body side concave surface 17, a protrusion 37 is provided on the main body 11 to make the main body side facing surface 19 protrude in a direction away from the circulation channel 35 (each circulation portion 35a) so that the internal thread portion 24 and the circulation channel 35 (each circulation portion 35a) do not interfere with each other. The protrusion 37 is configured in a manner that the main body side facing surface 19 protrudes toward the cover body 12 side. Since the length of the internal thread portion 24 (fastening portion) is ensured by forming the protrusion 37, the fastening force of the cover body 12 can be ensured while miniaturizing the main body 11.

[0034] On the other hand, the cover body 12 is provided with a recessed portion 38 having a shape corresponding to the shape of the protruding portion 37. Therefore, the main body side facing surface 19 and the cover side facing surface 20 include: a central portion 19a, 20a extending in a direction passing through the vicinity of the center of the battery C; and an outer portion 19b, 20b extending at a position offset in the facing direction relative to the central portion 19a, 20a. In the facing direction, the outer portions 19b, 20b are arranged at a position away from the flow passage 35 relative to the central portion 19a, 20a. Therefore, compared with a structure in which the main body side facing surface 19 and the cover side facing surface 20 are formed into a single plane, the internal thread portion 24 (fastening portion) can be formed longer.

[0035] As described above, in this embodiment, the battery C can be sandwiched between the main body side concave surface 17 of the main body 11 and the cover side concave surface 18 of the cover body 12. That is, the battery C is held by the main body 11 and the cover body 12, and in this state, the temperature of the battery C is adjusted to a specified temperature through the main body 11 by circulating the heat medium through the circulation passage 35 of the main body 11. Therefore, compared with the case where the air temperature around the battery C is adjusted to a specified temperature like a thermostat and the heat medium is not circulated, the temperature of the battery C can be more accurately adjusted to a desired specified temperature. That is, since the circulation passage 35 for circulating the heat medium is provided in the main body 11, the temperature of the main body 11 that cooperates with the cover body 12 to hold the battery C is controlled by controlling the temperature of the heat medium. Therefore, the temperature of the battery C can be more accurately controlled through the main body 11. In addition, by sandwiching the battery C with the main body side concave surface 17 and the cover side concave surface 18, the battery C can be held at a specified position, and thus the burden of the preparation work for the battery test can be reduced.

[0036] In addition, in this embodiment, from the direction perpendicular to the opposing direction (in Figure 2 When viewed from the left and right directions (in the middle), the circulation channel 35 (each circulation portion 35a) is arranged at a position where a part of the circulation channel 35 (each circulation portion 35a) overlaps with the main body side concave surface 17. Therefore, the amount of the circulation channel 35 (each circulation portion 35a) protruding from the main body side concave surface 17 in the opposite direction can be suppressed. Therefore, the battery test jig 10 can be miniaturized. In addition, since the circulation channel 35 (each circulation portion 35a) is arranged near the battery C, the temperature of the battery C can be made closer to the temperature of the heat medium.

[0037] Furthermore, in this embodiment, since the circulation channel 35 includes a pair of circulation portions 35a respectively arranged on both sides of the main body side concave surface 17, the heat transfer efficiency to the battery C can be improved and the temperature unevenness in the main body 11 can be reduced, thereby reducing the temperature unevenness of the battery C.

[0038] In addition, in this embodiment, since the circulation channel 35 (each circulation portion 35a) is in a shape extending straight in the main body 11, the protrusion amount of the circulation channel 35 (each circulation portion 35a) from the main body side concave surface 17 in the opposite direction can be suppressed. Therefore, the battery test jig 10 can be further miniaturized. In addition, the flow resistance of the heat medium can be reduced.

[0039] In addition, in this embodiment, the main body 11 has the protruding portion 37 that protrudes the main body-side facing surface 19 . Therefore, the battery test jig 10 can be miniaturized while ensuring the fastening force of the cover 12 to the main body 11 by the fastening portion 13 .

[0040] Furthermore, in the present embodiment, when the cover 12 is pushed toward the head 13b of the bolt 13a and is about to be displaced in a direction away from the main body 11 due to the expansion of the battery C, the elastic body 30 is deformed. This allows the cover 12 to move in a direction away from the main body 11. Therefore, the cover 12 can be moved in a manner following the expansion of the battery C, and thus the force acting on the fastening portion 13 when the battery C expands can be reduced, thereby preventing the fastening portion 13 from being damaged.

[0041] In addition, the embodiments disclosed this time are illustrative in all points and should not be considered as limiting. The present invention is not limited to the embodiments described above, and various changes and improvements can be made without departing from the scope of the present invention. Figure 2 In the illustrated structure, the flow passage 35 (flow portion 35 a ) is located on the extension line of the internal thread portion 24 , but the present invention is not limited thereto. For example, the flow passage 35 (flow portion 35 a ) may be arranged at a position deviated from the extension line of the internal thread portion 24 .

[0042] In addition, in the above-described embodiment, the main body 11 has the protrusion 37 and the cover 12 has the recess 38, but a structure without the protrusion 37 and the recess 38 may be adopted. In this case, for example Figure 3 As shown, the flow passage 35 (flow portion 35a) may be arranged at a position deviated from the extension line of the internal thread portion 24. In this case, it is possible to prevent the main body 11 from increasing in size in the facing direction.

[0043] In addition, in a structure in which the flow passage 35 (flow portion 35a) is arranged on the extension line of the internal thread portion 24, as shown in FIG. Figure 4 As shown in FIG. 1 , a structure without protrusion 37 and recess 38 may also be adopted. In this case, in the direction perpendicular to the facing direction ( Figure 4 When viewed from the left and right directions (in the left and right directions), the circulation channel 35 (each circulation portion 35a) may be arranged at a position not overlapping with the main body side concave surface 17. Figure 4 The flow passage 35 (each flow portion 35a) is arranged in a structure where the flow passage 35 (each flow portion 35a) is not overlapped with the main body side concave surface 17 when viewed in the left and right direction. Figure 5 As shown, the flow passage 35 may be arranged on the back side of the main body side concave surface 17 in the facing direction.

[0044] In addition, if Figure 6 As shown, the battery test fixture 10 may also be a structure for holding a plurality of batteries C. In this case, the body side concave surface 17 and the cover side concave surface 18 are provided in accordance with the number of batteries C to be held. A portion of the flow section 35a may be provided between adjacent body side concave surfaces 17, but the flow section 35a between the body side concave surfaces 17 may also be omitted. In addition, in the structure for holding a plurality of batteries C, a Figures 3 to 5 structure.

[0045] In addition, in the case of the battery test jig 10 having a structure for holding a plurality of batteries C, as shown in FIG. Figure 7 As shown, a temperature adjustment unit 40 may be provided so that the temperature level of each battery C can be changed. The temperature adjustment unit 40 may be formed by a thermoelectric conversion element such as a Peltier element, or may be formed by a heater. The temperature adjustment unit 40 is used to correct the temperature of the main body 11 adjusted by the heat medium flowing through the circulation channel 35.

[0046] The temperature regulating unit 40 is installed near a part of the batteries C among the plurality of batteries C, and plays a function of making the temperature of the part of the main body 11 that contacts the part of the batteries C different from the temperature of the part that contacts the other part of the batteries C. That is, the temperature regulating unit 40 is preferably arranged at a position closer to the other part of the battery retaining unit 22 relative to the part of the battery retaining unit 22. In this way, by controlling the plurality of batteries C to different temperatures, battery tests at different temperature levels can be performed simultaneously. In addition, when battery tests at different temperature levels are performed simultaneously, heat media at different temperatures can also be circulated in the circulation channel 35 (circulation portion 35a) near a part of the batteries C and the circulation channel 35 (circulation portion 35a) near other batteries C.

[0047] In addition, if Figure 8 As shown in FIG. 1 , the temperature adjustment unit 40 may be provided corresponding to each of all the batteries C. In this case, the temperature adjustment unit 40 is also used to correct the temperature of the main body 11 adjusted by the heat medium flowing through the circulation channel 35. In this case, the temperature adjustment unit 40 may be used to fine-tune the temperature adjusted by the heat medium. In addition, each battery C may be adjusted to a different temperature by each temperature adjustment unit 40.

[0048] Furthermore, the temperature adjustment unit 40 may be provided in the battery test jig 10 having a structure for holding one battery C. In this case, the temperature adjustment unit 40 has a function of finely adjusting the temperature of the main body 11 adjusted by the heat medium.

[0049] Furthermore, in the above-described embodiment, the flow channel 35 is formed in a shape extending straight in the main body 11 , but the present invention is not limited thereto and the flow channel 35 may be formed in a shape meandering in the main body 11 , for example.

[0050] Furthermore, in the above-described embodiment, the elastic body 30 is provided; however, when the battery C expansion test is not performed, the elastic body 30 may be omitted.

[0051] exist Figures 1 to 8 FIG. 1 shows a battery test jig 10 for holding a cylindrical battery C, but the battery test jig 10 may also be Fig. 9 1 is a structure for holding a square battery C. In this case, the body side concave surface 17 and the cover side concave surface 18 may also be configured to form a battery holding portion 22 with a rectangular cross section instead of an arc-shaped cross section. In this case, from a direction perpendicular to the opposite direction ( Fig. 9 When viewed in the left-right direction of the body, the circulation channel 35 (each circulation portion 35a) may be arranged at a position where at least a portion of the circulation channel 35 (each circulation portion 35a) overlaps with the main body side concave surface 17. In addition, the circulation channel 35 may include a circulation portion passing through the back side of the main body side concave surface 17, or may be a circulation channel without a plurality of circulation portions.

[0052] In addition, if Fig.10 As shown, the battery test jig 10 may be configured to hold a flat battery C such as a stacked battery C. In this case, the flow channel 35 may include a flow portion 35b passing through the back side of the main body side concave surface 17. In the case of the stacked battery C, the protrusion 37 and the recess 38 may be omitted as long as there is no interference between the internal thread portion 24 and the flow channel 35 (each flow portion 35a, 35b). In addition, the flow channel 35 may be a single flow channel without a plurality of flow portions.

[0053] Here, the above-mentioned embodiments will be briefly described.

[0054] (1) The battery test jig according to the embodiment includes: a main body having a concave surface corresponding to the shape of a battery; and a cover having a concave surface corresponding to the shape of the battery and sandwiching the battery between the concave surface and the concave surface of the main body. The main body has a flow channel for circulating a heat medium for adjusting the temperature of the battery.

[0055] In the battery test fixture, the battery can be clamped between the concave surface of the main body and the concave surface of the cover. That is, the battery is held by the main body and the cover, and in this state, a heat medium is circulated in the circulation channel of the main body, so that the temperature of the battery can be adjusted to a specified temperature through the main body. Therefore, compared with the case where the air temperature around the battery is adjusted to a specified temperature and the heat medium is not circulated like a thermostat, the temperature of the battery can be adjusted to the required specified temperature more accurately. That is, since a circulation channel for circulating the heat medium is provided in the main body, the temperature of the main body that cooperates with the cover to hold the battery is controlled by controlling the temperature of the heat medium. Therefore, the temperature of the battery can be controlled more accurately through the main body. In addition, by clamping the battery with the concave surface of the main body and the concave surface of the cover, the battery can be held in a specified position, so the burden of preparation work for battery testing can also be reduced.

[0056] (2) When viewed from a direction perpendicular to the direction in which the main body and the cover body face each other, at least a portion of the flow channel may be located at a position overlapping with the concave surface of the main body.

[0057] In this technical solution, the flow channel of the heat medium can be prevented from protruding from the concave surface in the direction in which the main body and the cover body face each other, or the amount of protrusion from the concave surface in the direction in which the heat medium faces each other can be suppressed. Therefore, the battery test fixture can be miniaturized. In addition, since a structure in which the flow channel is arranged near the battery can be adopted, in this case, the battery temperature can be made closer to the temperature of the heat medium.

[0058] (3) The circulation channel may also include a pair of circulation portions respectively arranged on both sides of the concave surface of the main body. In this technical solution, the heat transfer efficiency to the battery can be improved, and the temperature unevenness of the main body can be reduced, thereby reducing the temperature unevenness of the battery.

[0059] (4) The circulation channel may also be in a straight shape in the main body. In this technical solution, the circulation channel of the heat medium can be prevented from protruding from the concave surface in the direction in which the main body and the cover body face each other, or the protrusion from the concave surface can be suppressed. Therefore, the battery test fixture can be further miniaturized. In addition, the flow resistance of the heat medium can be reduced.

[0060] (5) The battery test jig may further include a fastening portion that fastens the cover to the main body. In this case, the main body may have a protruding portion that protrudes on a surface facing the cover so as to ensure the fastening position of the fastening portion. In this technical solution, the battery test jig can be miniaturized while ensuring the fastening force of the fastening portion to fasten the cover to the main body.

[0061] (6) The battery test fixture may also include: a fastening portion having a head portion and fastening the cover body to the main body portion; and an elastic body sandwiched between the head portion and the cover body and allowing the cover body to shift in a direction away from the main body portion due to expansion of the battery.

[0062] In this technical solution, the cover can be fastened to the main body by the fastening part. On the other hand, when the cover is displaced in the direction away from the main body due to the expansion of the battery, the elastic body is pressed toward the head and deformed, thereby allowing the cover to move in the direction away from the main body. Therefore, the cover can be displaced in a manner following the expansion of the battery, so that the force acting on the fastening part when the battery expands can be reduced, thereby preventing the fastening part from being damaged.

[0063] (7) The battery test jig may further include a temperature adjustment unit configured to further adjust the temperature of the main body after the temperature is adjusted by the heat medium.

[0064] In this technical solution, the temperature of the battery adjusted by the heat medium can be further adjusted by the temperature adjustment unit. Therefore, for example, when the temperature of multiple batteries is adjusted by the heat medium, the temperature adjustment unit can be used to adjust the temperature of a part of the batteries. Therefore, in this case, tests at different temperature levels can be performed simultaneously. In addition, even if the temperature of the battery is not adjusted with high precision by the heat medium, the temperature adjustment unit can be used to adjust the temperature of the battery with high precision. Therefore, the temperature accuracy of the battery can be improved without increasing the temperature management accuracy of the heat medium.

[0065] As described above, the battery test can be performed in a state where the temperature of the battery can be more accurately and easily controlled.

[0066] This application is based on Japanese patent application No. 2023-102023 filed on June 21, 2023, the contents of which are incorporated herein by reference.

[0067] In order to describe the present invention, the present invention is appropriately and fully described above with reference to the accompanying drawings and through the embodiments, but it should be recognized that those skilled in the art can easily change and / or improve the above-mentioned embodiments. Therefore, as long as the modified embodiments or improved embodiments implemented by those skilled in the art do not deviate from the level of the protection scope of the claims recorded in the claims, the modified embodiments or improved embodiments can be interpreted as being included in the protection scope of the claims.

Claims

1. A battery test fixture, characterized in that include: A main body having a concave surface corresponding to the shape of the battery; as well as The cover has a concave surface corresponding to the shape of the battery, and the battery is sandwiched between the concave surface and the concave surface of the main body, wherein: The main body has a flow channel through which a heat medium for adjusting the temperature of the battery flows.

2. The battery test fixture according to claim 1, characterized in that: When viewed from a direction perpendicular to a direction in which the main body and the cover body face each other, at least a portion of the flow channel is located at a position overlapping with the concave surface of the main body.

3. The battery test fixture according to claim 1 or 2, characterized in that: The circulation channel includes a pair of circulation portions respectively arranged on both sides of the concave surface of the main body.

4. The battery test fixture according to claim 1 or 2, characterized in that: The flow channel has a straight shape in the main body.

5. The battery test fixture according to claim 1 or 2, characterized in that Also includes: A fastening part fastens the cover to the main body, wherein: The main body has a protrusion on a surface facing the cover body, the protrusion protruding so as to secure a fastening position of the fastening portion.

6. The battery test fixture according to claim 1 or 2, characterized in that Also includes: A fastening portion having a head portion and fastening the cover to the main body portion; as well as The elastic body is interposed between the head and the cover, and allows the cover to be displaced in a direction away from the main body due to expansion of the battery.

7. The battery test fixture according to claim 1 or 2, characterized in that Also includes: The temperature adjustment unit is used to further adjust the temperature of the main body after the temperature is adjusted by the heat medium.

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