Battery constant volume tool

Abstract

The utility model discloses a battery constant volume tool which comprises a box body, a heat exchange plate and a test assembly, wherein a to-be-tested battery is arranged in the box body; the heat exchange plates are arranged on the two sides of the to-be-tested battery in the first direction, at least one of the heat exchange plates located on the two sides of the to-be-tested battery is arranged in the box body in a sliding mode in the first direction, and the heat exchange plates have the first state of exchanging heat with the to-be-tested battery; the test assembly is arranged on the box body, and when the heat exchange plate is in the first state, the to-be-tested battery is connected with the test assembly so as to test the to-be-tested battery. Therefore, according to the battery constant volume tool, the heat exchange plate is arranged in the to-be-tested battery, so that the constant volume temperatures of different battery positions in the constant volume equipment can be accurately controlled, and the consistency of battery capacity testing can be better ensured. At least one of the heat exchange plates on the two sides of the battery can move, namely, the distance between the heat exchange plates is adjustable, the battery can be conveniently placed, meanwhile, the tool is suitable for constant volume of batteries of different models, the operation convenience of the tool can be improved, and the universality of the tool can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field, concretely relates to a battery constant volume tool. BACKGROUND

[0002] With the more and more wide application of lithium ion battery, the requirement of battery manufacturing is also continuously improved. And in most application scenarios, different numbers of lithium ion batteries need to be used after being connected in series and parallel, which requires that the capacity of single battery in a group has good consistency, otherwise the "barrel effect" is easy to appear, so that the battery group shows low capacity problem. Therefore, in the production process of lithium ion battery, battery constant volume and grading are particularly important to improve the grouping efficiency.

[0003] The deviation of constant volume temperature will affect the battery constant volume, and the current way to control the constant volume temperature is mainly to control the large environment temperature of the constant volume workshop. However, due to the difference of heat dissipation conditions at different positions of the constant volume cabinet and the self-heating of the battery during charging and discharging, it is found in actual verification process that although the large environment temperature is controlled, the temperature difference of the same batch of constant volume batteries will exist due to the actual situation such as battery storage location distribution, and the capacity fluctuation caused by the temperature difference will eventually cause large deviation between the constant volume capacity and the real capacity. UTILITY MODEL CONTENTS

[0004] Therefore, the purpose of the utility model is to provide a battery constant volume tool, which can solve the problem of deviation of constant volume temperature in battery constant volume.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A battery constant volume tool, comprising:

[0007] A box body, wherein a to-be-tested battery is arranged in the box body;

[0008] Heat exchange plates are arranged on both sides of the to-be-tested battery along a first direction, and at least one of the heat exchange plates arranged on both sides of the to-be-tested battery is slidingly arranged in the box body along the first direction, and the heat exchange plate has a first state of heat exchange with the to-be-tested battery;

[0009] A test assembly is arranged on the box body, and when the heat exchange plate is in the first state, the to-be-tested battery is connected with the test assembly to test the to-be-tested battery.

[0010] Optionally, in the above battery constant volume tool, the box body comprises:

[0011] A support plate, wherein at least one of the heat exchange plates arranged on both sides of the to-be-tested battery is slidingly arranged on the support plate along the first direction; and the to-be-tested battery is slidingly arranged on the support plate along the first direction;

[0012] a top plate, the test assembly being movably connected to the top plate along a second direction;

[0013] two side plates, the side plates being connected to the ends of the support plate and the top plate along the first direction.

[0014] Optionally, in the above battery volume setting device, the heat exchange plate is internally provided with a heat exchange channel allowing the flow of heat exchange medium, the heat exchange channel being arranged in a meandering manner inside the heat exchange plate;

[0015] wherein:

[0016] the heat exchange plate is provided with an inlet and an outlet on two sides along a third direction; and in the second direction, the height of the inlet is less than the height of the outlet;

[0017] Alternatively, the heat exchange plate is provided with an inlet and an outlet on one side along the third direction; and in the second direction, the height of the inlet is less than the height of the outlet.

[0018] Optionally, in the above battery volume setting device, further comprising a heat conducting member, the heat conducting member being located inside the heat exchange plate and on both sides of the heat exchange channel along the first direction, the heat conducting member being in contact with the heat exchange channel.

[0019] Optionally, in the above battery volume setting device, the side of the heat exchange plate facing the battery to be measured is provided with a heat conducting pad.

[0020] Optionally, in the above battery volume setting device, the support plate is provided with a guide rail extending along the first direction; the heat exchange plate is provided with a sliding part adapted to the guide rail, so that the heat exchange plate is slidably arranged on the support plate through the cooperation of the sliding part and the guide rail.

[0021] Optionally, in the above battery volume setting device, further comprising:

[0022] a guide rod, one end of the guide rod being connected to the heat exchange plate, the other end of the guide rod penetrating through the side plate, the side plate being provided with a through hole allowing the guide rod to pass through;

[0023] a first driving device connected to the end of the guide rod away from the heat exchange plate, so as to drive the heat exchange plate to slide along the first direction through the guide rod.

[0024] Optionally, in the above battery volume setting device, the test assembly comprises:

[0025] a second driving device arranged on the top plate;

[0026] a connecting block connected to the second driving device;

[0027] A constant volume probe is arranged on the connecting block, and the second driving device drives the constant volume probe to be connected with the pole column of the battery to be measured one by one when the heat exchange plate is in the first state.

[0028] Optionally, in the battery constant volume tool,

[0029] The heat exchange plate is provided with a pressure sensing device on the contact surface with the battery to be measured.

[0030] And / or, the heat exchange plate is further provided with a temperature sensing device.

[0031] Optionally, in the battery constant volume tool, a limiting piece is further included, the limiting piece is provided with a plurality of detection positions for accommodating the battery to be measured, each detection position limits the battery to be measured in a third direction, and the limiting piece is detachably and slidably connected with the support plate.

[0032] From the above technical solution, it can be seen that the heat exchange plate arranged in the battery to be measured can accurately control the constant volume temperature of different battery positions in the constant volume equipment, and can better ensure the consistency of the battery capacity test. At least one of the heat exchange plates on both sides of the battery is movable, that is, the spacing between the heat exchange plates is adjustable, which facilitates the placement of the battery and is also suitable for the constant volume of different models of batteries, can improve the convenience of tool operation and can ensure the versatility of the tool. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0034] Figure 1 The structure schematic view of the battery constant volume tool provided by the embodiment of the present application is shown in the figure.

[0035] Figure 2 The structure schematic view of the box provided by the embodiment of the present application is shown in the figure.

[0036] Figure 3 The structure schematic view of the heat exchange plate provided by the embodiment of the present application is shown in the figure.

[0037] Figure 4 The structure schematic view of the heat exchange channel provided by the embodiment of the present application is shown in the figure.

[0038] Figure 5 The structure schematic view of the limiting piece provided by the embodiment of the present application is shown in the figure.

[0039] Wherein:

[0040] 1, box; 11, support plate; 111, guide rail; 12, top plate; 13, side plate;

[0041] 2, heat exchange plate; 21, heat exchange channel; 22, inlet; 23, outlet; 24, heat conducting piece; 25, sliding part;

[0042] 3, battery to be measured;

[0043] 41, second driving device; 42, connecting block; 43, constant volume probe;

[0044] 5, guide rod; 6, limiting piece. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0046] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings or the orientation or position relationship commonly used when the utility model product is placed, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0047] As Figures 1 to 5 shown, the utility model embodiment provides a kind of battery constant volume tool, can solve the problem of deviation of constant volume temperature in battery constant volume.

[0048] Firstly, the battery constant volume device comprises a box body 1, heat exchange plates 2 and a test assembly; wherein the box body 1 is internally provided with a battery to be tested 3; the heat exchange plates 2 are arranged on both sides of the battery to be tested 3 along a first direction, but are not limited thereto, and the heat exchange plates 2 can also be arranged on one side of the battery to be tested 3 along the first direction, at which time the heat exchange plates 2 can be fixedly arranged in the box body 1 or slidably arranged in the box body 1 along the first direction; at least one of the heat exchange plates 2 arranged on both sides of the battery to be tested 3 is slidably arranged in the box body 1 along the first direction, that is, the heat exchange plates 2 on both sides of the battery can be slidably arranged in the box body 1 along the first direction, or one side can be fixedly arranged in the box body 1 and the other side can be slidably arranged in the box body 1 along the first direction; it should be noted that along the first direction, the battery to be tested 3 in the box body 1 can be one group, two groups or multiple groups, when the battery to be tested 3 is arranged as one group, the heat exchange plates 2 are arranged on both sides or one side of the battery to be tested 3 along the first direction; when the battery to be tested 3 is arranged as two groups, the heat exchange plates 2 between the two groups of batteries can be arranged separately or combined as one, and the combined heat exchange plates 2 are slidably connected with the box body 1 (the specific structure of the heat exchange plates 2 to be slid needs to avoid interference with the specific structure of other slidably arranged heat exchange plates 2 to ensure the operability of the device) or the combined heat exchange plates 2 are fixedly connected with the box body 1 (detailed in Figure 1 ); when the battery to be tested 3 is arranged as multiple groups, the heat exchange plates 2 between the adjacent two groups have the same structure as the heat exchange plates 2 between the two groups, that is, the multiple groups of batteries are only expanded along the first direction on the basis of the two groups. The heat exchange plates 2 have a first state of heat exchange with the battery to be tested 3; the test assembly is arranged on the box body 1, and when the heat exchange plates 2 are in the first state, the battery to be tested 3 is connected with the test assembly to test the battery to be tested 3. When the heat exchange plates 2 are fixedly connected with the box body 1, the connection forms include but are not limited to welded connection. It should be noted that the fluctuation of capacity caused by the difference in temperature directly affects the grouping result of the battery, and further causes the possibility of pressure difference in the later application of battery module and pack. Through the arrangement of the heat exchange plates 2, the temperature during the constant volume process can be controlled, the consistency of the grouping capacity of the lithium ion battery is improved, the grouping capacity is ensured to be reliable and accurate, and the pressure difference caused by the difference in the grouping capacity of the battery in the module and pack is reduced. In addition, the first direction can be a direction parallel to the length direction of the battery; or can be a direction parallel to the thickness direction of the battery (detailed in Figure 5 ), and parallel to the thickness direction, the heat exchange plates 2 can be in contact with the battery along the two sides in the thickness direction, and the two sides in the thickness direction of the battery are the two largest surfaces among the six surfaces of the battery, which can better play the function of the heat exchange plates 2 in adjusting the temperature of the battery.

[0049] It can be seen that the battery constant volume tool provided by the embodiment of the utility model can accurately control the constant volume temperature of different battery positions in the constant volume equipment by setting the heat exchange plates 2 in the battery to be measured 3, and can better ensure the consistency of the battery capacity test. At least one of the heat exchange plates 2 on both sides of the battery is movable, that is, the spacing between the heat exchange plates 2 is adjustable, which facilitates the placement of the battery and is also suitable for the constant volume of different models of batteries, can improve the convenience of tool operation and can ensure the versatility of the tool.

[0050] In specific implementation, the box body 1 includes a support plate 11, a top plate 12 and two side plates 13. Among them, at least one of the heat exchange plates 2 on both sides of the battery to be measured 3 is slidably arranged on the support plate 11 along the first direction, and the heat exchange plate 2 can also be slidably arranged on the top plate 12; the battery to be measured 3 is slidably arranged on the support plate 11 along the first direction, and the battery to be measured 3 can also be slidably arranged on the top plate 12 along the first direction; the test assembly is movably connected to the top plate 12 along the second direction (height direction); the side plates 13 are connected to the two ends of the support plate 11 and the top plate 12 along the first direction, and the side plates 13 play a connecting and supporting role for the support plate 11 and the top plate 12, so that a space for accommodating the heat exchange plate 2 and the battery to be measured 3 is formed between the support plate 11 and the top plate 12, and the side plates 13 are arranged at the two ends of the support plate 11 and the top plate 12 along the first direction, avoiding the support plate 11 and the top plate 12 protruding from the side plates 13 along the first direction, so that the volume of the box body 1 is as small as possible, thereby making the overall volume of the tool smaller and saving the floor space of the constant volume equipment.

[0051] In specific implementation, the heat exchange plate 2 is internally provided with a heat exchange channel 21 allowing the flow of heat exchange medium, and the heat exchange channel 21 is arranged in a bent manner inside the heat exchange plate 2. Compared with the linear arrangement, the bent arrangement can make the development length of the heat exchange channel 21 longer, the proportion of the area of the heat exchange channel 21 in the heat exchange plate 2 larger, and more heat exchange medium can be accommodated, thereby improving the heat exchange effect of the heat exchange plate 2. The heat exchange plate 2 is provided with an inlet 22 and an outlet 23 on both sides along the third direction, and the height of the inlet 22 is less than the height of the outlet 23 in the second direction. Alternatively, the heat exchange plate 2 is provided with an inlet 22 and an outlet 23 on one side along the third direction, and the height of the inlet 22 is less than the height of the outlet 23 in the second direction. That is, the circulation mode of the heat exchange medium is down-in and up-out, which can improve the filling volume of the heat exchange medium and better ensure the heat exchange efficiency. It should be noted that the cooling method used in the tool is liquid cooling, that is, the heat exchange medium is a liquid, and the liquid flows inside the heat exchange plate 2 and is isolated from the production environment, which can ensure the temperature and humidity of the production workshop environment, but is not limited thereto. The specific type of heat exchange medium can be designed according to actual needs by those skilled in the art. In addition, the bent arrangement of the heat exchange channel 21 inside the heat exchange plate 2 can be that adjacent heat exchange channels 21 are arranged in an s shape (see Figure 4The heat exchange pipes can also be arranged in a spiral manner, but are not limited thereto, and the arrangement of the heat exchange pipes can be designed by those skilled in the art according to actual needs.

[0052] In specific implementation, the heat conduction member 24 is arranged in the heat exchange plate 2 and located on both sides of the heat exchange channel 21 along the first direction, or located on one side of the heat exchange channel 21 along the first direction, and the heat conduction member 24 is in contact with the heat exchange channel 21. That is, the heat exchange plate 2 is designed to be composed of the heat exchange channel 21 and the heat conduction member 24 on both sides or one side. The presence of the heat conduction member 24 can expand the effective heat exchange area of the heat exchange pipes and improve the heat exchange efficiency. It should be noted that the heat exchange member includes but is not limited to the heat exchange copper pipe.

[0053] In specific implementation, the side of the heat exchange plate 2 facing the battery to be measured 3 is provided with a heat conduction pad. That is, the position of the heat exchange plate 2 pressing the battery to be measured 3 is equipped with a heat conduction pad, which can conduct heat on one hand and reduce the possibility of the battery to be measured 3 being pressed by out-of-control tooling equipment on the other hand. It should be noted that the heat conduction pad includes but is not limited to heat conduction silica gel.

[0054] In specific implementation, the support plate 11 is provided with a guide rail 111 extending along the first direction, and the heat exchange plate 2 is provided with a sliding part 25 matched with the guide rail 111, so that the heat exchange plate 2 is arranged on the support plate 11 by the cooperation of the sliding part 25 and the guide rail 111. The guide rail 111 can be a strip-shaped groove or a strip-shaped protrusion, and the sliding part 25 can be a slider or a pulley matched with the strip-shaped groove, or a slider matched with the strip-shaped protrusion. The guide rail 111 can also be a limiting structure limiting the heat exchange plate 2 in the third direction, and the sliding part 25 can be a ball, so that the heat exchange plate 2 can move along the first direction, but is not limited thereto. The specific structure of the sliding connection between the heat exchange plate 2 and the support plate 11 can be designed by those skilled in the art according to actual needs.

[0055] In specific implementation, the device further includes a guide rod 5 and a first driving device. One end of the guide rod 5 is connected to the heat exchange plate 2, and the other end of the guide rod 5 penetrates the side plate 13, and the side plate 13 is provided with a through hole allowing the guide rod 5 to pass through. The first driving device is connected to the end of the guide rod 5 away from the heat exchange plate 2, so as to drive the heat exchange plate 2 to slide along the first direction through the guide rod 5. It should be noted that when the battery to be measured 3 is provided with multiple groups along the first direction, the other end of the heat exchange plate 2 at the middle position not only penetrates the side plate 13, but also is provided with a through hole allowing the guide rod 5 to pass through. The other heat exchange plates 2 arranged between the heat exchange plate 2 and the side plate 13 are also provided with through holes allowing the guide rod 5 to pass through, so as to avoid interference between the first driving devices and the guide rod 5 of different heat exchange plates 2. In addition, the first driving device includes but is not limited to a pneumatic device, which is moved by the pneumatic device to ensure that the battery poles of a batch of batteries are in the same horizontal line during the battery constant volume process, so as to ensure the stability of the battery constant volume process.

[0056] In specific implementation, the test assembly includes the second driving device 41, the connecting block 42 and the constant volume probe 43. The second driving device 41 is arranged on the top plate 12. The connecting block 42 is connected with the second driving device 41. The constant volume probe 43 is arranged on the connecting block 42. When the heat exchange plate 2 is in the first state, the second driving device 41 drives the constant volume probe 43 to be connected with the pole column of the battery 3 one by one. It should be noted that the second driving device 41 includes but is not limited to a pneumatic device. The movement of the pneumatic device can ensure the stability of the battery constant volume. In addition, the constant volume probe 43 can move through a guide rail or other structures, which can ensure the practicability of the constant volume of different batteries.

[0057] In specific implementation, the heat exchange plate 2 is provided with a pressure sensing device on the contact surface with the battery 3 to be tested. The pressure sensing device is located at the lower end of the heat exchange plate 2. Three pressure sensors are arranged on the contact surface of the heat exchange plate 2 with the battery 3 to be tested, which are located at the middle and both sides of the heat exchange plate 2 along the third direction, for detecting whether the battery core position is fixed or not. However, the specific position and the specific number of the pressure sensors can be designed according to actual needs by those skilled in the art. In addition, the heat exchange plate 2 is also provided with a temperature sensing device. Three temperature sensing devices are arranged at the upper end of each heat exchange plate 2, which are located at the middle and both sides of the heat exchange plate 2 along the third direction, and are arranged beside the initial equipment of the test assembly in the second direction (at the position of the internal heat exchange channel 21), so as to avoid damage of the temperature sensing device caused by extrusion in the actual operation process. However, the specific position and the specific number of the temperature sensing device can be designed according to actual needs by those skilled in the art.

[0058] In specific implementation, the limiting piece 6 is also included. The limiting piece 6 is provided with a plurality of detection positions for accommodating the battery 3 to be tested, so as to facilitate the constant volume of a plurality of batteries by the constant volume tool at one time. Each detection position limits the battery 3 to be tested along the third direction. The limiting piece 6 is detachably and slidably connected with the supporting plate 11, so as to facilitate the movement of the battery to the state that the battery 3 to be tested is connected with the test assembly through the adjustment of the limiting piece 6, and the operation is convenient. In addition, the limiting piece 6 is detachable, which can replace the limiting piece 6 according to different models of batteries, so as to improve the practicability and adaptability of the tool.

[0059] In specific implementation, the support plate 11 is provided with a protrusion structure on both sides along the third direction, the limiting piece 6 is located between the protrusion structures on both sides, the top surface of the protrusion structure along the second direction is higher than the bottom surface of the limiting piece 6 along the second direction, the protrusion structure can limit the movement of the limiting piece 6 along the third direction, can cooperate with the heat exchange plates 2 on both sides of the battery to limit the movement of the battery along the first direction, and can cooperate with the support plate 11 to limit the movement of the battery along the second direction, thereby achieving the position control of the battery in three-dimensional directions, so that the battery can be accurately and quickly moved to the state that the battery to be tested 3 is connected with the test assembly, the battery poles in a group can be fully contacted with the constant volume device, and the stability of the battery constant volume test is ensured.

[0060] In specific implementation, the heat exchange plates 2, the temperature sensing device, the pressure sensing device and the test assembly are controlled by the integrated panel, the pressure and the temperature of the heat exchange plates 2 can be displayed in real time, and the work personnel can adjust the tooling device.

[0061] In specific implementation, after the formation process, the battery is transferred to the corresponding limiting piece 6 by the clamping jaw, and the distance of the battery along the third direction is fixed; after being moved to the tooling, the protrusion structure ensures the longitudinal distance of the limiting piece 6 along the third direction, and the heat exchange plates 2 on both sides are extruded to the center part to fix the distance of the heat exchange plates 2 along the first direction; after the position of the battery cell is completely fixed, the upper constant volume probe 43 is lowered to contact the battery pole, and the constant volume process is performed. In this process, the liquid in the heat exchange plates 2 keeps circulating, and the constant volume process environment temperature is stable through liquid cooling control.

[0062] Finally, it should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0063] The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the various embodiments can be mutually referred to.

[0064] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery sizing tool, characterized by, The application relates to a battery testing device. The device comprises: a box (1) in which a battery to be tested (3) is arranged; heat exchange plates (2) arranged on both sides of the battery to be tested (3) along a first direction, at least one of the heat exchange plates (2) arranged on both sides of the battery to be tested (3) being slidably arranged in the box (1) along the first direction, the heat exchange plates (2) having a first state of heat exchange with the battery to be tested (3); 2. The battery sizing tool of claim 1, wherein, a testing assembly arranged on the box (1), the battery to be tested (3) being connected to the testing assembly to test the battery to be tested (3) when the heat exchange plates (2) are in the first state. The box (1) comprises: a support plate (11), at least one of the heat exchange plates (2) arranged on both sides of the battery to be tested (3) being slidably arranged on the support plate (11) along the first direction, the battery to be tested (3) being slidably arranged on the support plate (11) along the first direction; a top plate (12), the testing assembly being movably connected to the top plate (12) along a second direction; 3. The battery sizing tool of claim 1, wherein, two side plates (13), the side plates (13) being connected to both ends of the support plate (11) and the top plate (12) along the first direction. The heat exchange plates (2) are internally provided with heat exchange channels (21) allowing a heat exchange medium to flow, the heat exchange channels (21) being arranged in a meandering manner inside the heat exchange plates (2); wherein: the heat exchange plates (2) are respectively provided with an inlet (22) and an outlet (23) on both sides along a third direction, and the height of the inlet (22) is less than the height of the outlet (23) along the second direction; 4. The battery sizing tool of claim 3, wherein, alternatively, the heat exchange plates (2) are provided with an inlet (22) and an outlet (23) on one side along the third direction, and the height of the inlet (22) is less than the height of the outlet (23) along the second direction.

5. The battery sizing tool of claim 1, wherein, The device further comprises a heat conduction member (24) arranged inside the heat exchange plates (2) and located on both sides of the heat exchange channels (21) along the first direction, the heat conduction member (24) being in contact with the heat exchange channels (21).

6. The battery sizing tool of claim 2, wherein, The heat exchange plates (2) are provided with a heat conduction pad on the side facing the battery to be tested (3).

7. The battery sizing tool of claim 2, wherein, The support plate (11) is provided with a guide rail (111) extending along the first direction, and the heat exchange plates (2) are provided with sliding portions (25) matched with the guide rail (111), so that the heat exchange plates (2) are slidably arranged on the support plate (11) through the cooperation of the sliding portions (25) and the guide rail (111). The device further comprises: a guide rod (5), one end of the guide rod (5) being connected to the heat exchange plates (2) and the other end of the guide rod (5) penetrating through the side plates (13), the side plates (13) being provided with through holes allowing the guide rod (5) to pass through; 8. The battery sizing tool of claim 2, wherein, a first driving device connected to the end of the guide rod (5) away from the heat exchange plates (2) to drive the heat exchange plates (2) to slide along the first direction through the guide rod (5). The testing assembly comprises: a second driving device (41) arranged on the top plate (12); a connecting block (42) connected to the second driving device (41). A constant volume probe (43) is arranged on the connecting block (42), and the second driving device (41) drives the constant volume probe (43) to be connected with the pole column of the battery to be measured (3) one by one when the heat exchange plate (2) is in the first state.

9. The battery constant volume tool according to claim 1, characterized in that, The heat exchange plate (2) is provided with a pressure sensing device on the contact surface with the battery to be measured (3); And / or, the heat exchange plate (2) is further provided with a temperature sensing device.

10. The battery sizing tool of claim 2, wherein, Further comprising a limiting piece (6), the limiting piece (6) is provided with a plurality of detection positions for accommodating the battery to be measured (3), each detection position limits the battery to be measured (3) in a third direction, and the limiting piece (6) is detachably and slidably connected with the support plate (11).

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