Battery cell performance testing device and battery pack

Abstract

The embodiment of the utility model provides a battery cell performance testing device and a battery pack, and belongs to the technical field of battery manufacturing. The device comprises a first supporting piece, a movable piece and a sensor. A through hole is formed in the first supporting piece, the movable piece is movably connected into the through hole, the movable piece is provided with a first side and a second side which are opposite, the through hole is provided with a first end and a second end which are opposite, and the first side of the movable piece is flush with the first end of the through hole or protrudes out of the first end of the through hole. The second side of the movable part is flush with the second end of the through hole or protrudes out of the second end of the through hole, and the sensor is in contact with the second side of the movable part; the first side of the movable part is used for contacting the battery cell; the movable part can move relative to the first supporting part along the axis direction of the through hole; when the surface of the battery cell expands and deforms in the charging process, the movable piece is extruded, the movable piece extrudes the sensor at the same time, the expansion force is transmitted to the sensor, the expansion force of the battery cell can be monitored in real time, and the situation that the service life of the battery cell is lost and even short circuit and thermal runaway are caused when the expansion force is too large is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and particularly relates to a core performance testing device and a battery pack. Background Art

[0002] With the continuous development of new energy technologies, the performance requirements for power batteries are getting higher and higher. While the energy density is increased, the control of safety performance is also crucial.

[0003] During the charging process, the core will generate a certain amount of expansion, and during the discharging process, it will generate a certain amount of contraction, which is similar to the breathing effect of the human body and is called the "breathing effect" of the core. During the charging process, the core will generate a certain amount of expansion force, which will increase sharply at the end of the core life or when it is used improperly, leading to a rapid decay of the core life. In severe cases, it may cause short circuit and thermal runaway. In addition, the excessive expansion force may also cause deformation and cracking of the end plate of the battery pack, seriously affecting the safety of the battery system.

[0004] However, in the related technologies, there is a lack of effective monitoring of the expansion force of the core. Summary of the Utility Model

[0005] The purpose of the embodiments of the utility model is to provide a core performance testing device and a battery pack to solve the problem of the lack of effective monitoring of the expansion force of the core in the related technologies.

[0006] To solve the above technical problems, the utility model is implemented as follows:

[0007] In a first aspect, the embodiments of the utility model provide a core performance testing device, including a first support member, a movable member and a sensor;

[0008] A through hole is formed in the first support member, the movable member is movably connected in the through hole, the movable member has a first side and a second side, the first side and the second side are opposite to each other, the through hole has a first end and a second end, the first end and the second end are opposite to each other, the first side of the movable member is flush with or protrudes from the first end of the through hole, the second side of the movable member is flush with or protrudes from the second end of the through hole, and the sensor is in contact with the second side of the movable member;

[0009] The first side of the movable member is used for contacting the core to sense the expansion force, and the movable member can move relative to the first support member along the axial direction of the through hole.

[0010] Optionally, the movable member includes a first movable part and a second movable part which are connected to each other;

[0011] One side of the first movable part away from the second movable part is close to the first end of the through hole. Along the direction from the first end to the second end of the through hole, the cross-sectional area of the first movable part gradually increases, and the cross-sectional area of the second movable part gradually decreases.

[0012] Optionally, the second movable part protrudes from the second end of the through hole and extends outward.

[0013] Optionally, the first side of the movable part is flush with the first end of the through hole.

[0014] Optionally, the surface area of the first side of the movable part is S1, and the surface area of the second side of the movable part is S2, where S1≥S2.

[0015] Optionally, the cell performance testing device further includes a second support member and a stop member;

[0016] The second support member is fixedly connected to the first support member, the stop member is connected to the second support member, and the stop member is located on the side of the sensor away from the movable part.

[0017] Optionally, a first adhesive member or a first elastic member is provided between the stop member and the sensor.

[0018] Optionally, a second adhesive member or a second elastic member is provided on the first side of the movable part.

[0019] Optionally, the first support member is a battery pack cross beam.

[0020] In a second aspect, an embodiment of the present invention further provides a battery pack, including the cell performance testing device according to any one of the above embodiments.

[0021] In the embodiment of the present invention, the cell performance testing device includes a first support member, a movable part, and a sensor. A through hole is provided on the first support member, the movable part is movably connected in the through hole, and the movable part can move relative to the first support member along the axis of the through hole. The first side of the movable part corresponds to the first end of the through hole, and the second side of the movable part corresponds to the second end of the through hole. The first side of the movable part is used to contact the cell to sense the change in the expansion force of the cell during the charge and discharge process, and the second side of the movable part contacts the sensor. When the surface of the cell generates expansion deformation during the charging process, it squeezes the first side of the movable part, and the first side of the movable part moves along the axis towards the second end of the through hole. At the same time, the second side of the movable part squeezes the sensor, and the expansion force of the cell can be transmitted to the sensor. The sensor reads the expansion force data, and the expansion force of the cell can be monitored immediately and effectively, avoiding the phenomenon of loss of cell life or even short circuit and thermal runaway when the expansion force is too large. Description of the Drawings

[0022] Figure 1It is a schematic structural diagram of the cell performance testing device provided by the embodiment of the present utility model;

[0023] Figure 2 is an embodiment of the present utility model Figure 1 The partial enlarged schematic diagram of position I in;

[0024] Figure 3 is a schematic diagram of the cell expansion process in the embodiment of the present utility model;

[0025] Figure 4 is a schematic diagram of the first support member in a certain direction in the embodiment of the present utility model;

[0026] Figure 5 is a schematic diagram of the first support member in another direction in the embodiment of the present utility model;

[0027] Figure 6 is a schematic diagram of the movable member in the embodiment of the present utility model.

[0028] Reference numerals:

[0029] 1 - First support member, 11 - Through hole, 111 - First end, 112 - Second end, 2 - Movable member, 201 - First side, 202 - Second side, 21 - First movable part, 22 - Second movable part, 3 - Sensor, 4 - Second support member, 5 - Stop member, 6 - Cell, 61 - Convex bulge, 7 - Frame. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] The terms "first", "second", etc. in the description and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0032] The following will, in conjunction with the accompanying drawings, elaborate on the cell performance testing device and battery pack provided by the embodiments of the present utility model through specific embodiments and their application scenarios.

[0033] Referring to Figure 1 and Figure 2 , the embodiments of the present utility model provide a cell performance testing device, including a first support member 1, a movable member 2 and a sensor 3; a through hole 11 is formed in the first support member 1, the movable member 2 is movably connected in the through hole 11, the movable member 2 has a first side 201 and a second side 202, the first side 201 and the second side 202 are opposite to each other, the through hole 11 has a first end 111 and a second end 112, the first end 111 and the second end 112 are opposite to each other, the first side 201 of the movable member 2 is flush with or protrudes from the first end 111 of the through hole 11, the second side 202 of the movable member 2 is flush with or protrudes from the second end 112 of the through hole 11, and the sensor 3 is in contact with the second side 202 of the movable member 2; the first side 201 of the movable member 2 is used to contact the cell to sense the expansion force, and the movable member 2 can move relative to the first support member 1 along the axial direction of the through hole 11.

[0034] Specifically, as Figure 1 and Figure 2As shown in the figure, the cell performance testing device provided by the embodiment of the present utility model is mainly used to test the expansion force index of the cell during the charge and discharge process to reflect the health status of the cell. The device includes a first support member 1, a movable member 2 and a sensor 3. The first support member 1 has a fixing and rigid support function. When the cell performance testing device is used in a battery pack, the first support member 1 is the battery pack crossbeam or the battery pack housing. When the surface of the cell 6 is attached to the battery pack crossbeam, the first support member 1 is the battery pack crossbeam; when the surface of the cell 6 is attached to the battery pack housing, the first support member 1 is the battery pack housing. A through hole 11 is formed on the first support member 1. The through hole 11 has a first end 111 and a second end 112, and the first end 111 and the second end 112 are opposite to each other. The cross-sectional shape of the through hole 11 can be circular or quadrilateral, and the present embodiment does not limit this. The number of the through holes 11 can be one, two or more, depending on the number of cells 6 to be measured, and the through holes 11 are distributed along the extension direction Y of the first support member 1. The relationship between the movable member 2 and the first support member 1 is a clearance fit. The movable member 2 has a first side 201 and a second side 202, and the first side 201 and the second side 202 are opposite to each other. The outer diameter of the movable member 2 is slightly smaller than the inner diameter of the through hole 11, so that the movable member 2 is movably connected in the through hole 11. The first side 201 of the movable member 2 is flush with or protrudes from the first end 111 of the through hole 11. The second side 202 of the movable member 2 is flush with or protrudes from the second end 112 of the through hole 11. That is, the first side 201 of the movable member 2 corresponds to the first end 111 of the through hole 11, and the second side 202 of the movable member 2 corresponds to the second end 112 of the through hole 11. The specific setting positions of both sides of the movable member 2 are determined according to actual needs. The first side 201 of the movable member 2 is used to contact the cell 6, and the second side 202 of the movable member 2 contacts the sensor 3. As Figure 3 shown, when the cell 6 is not charged or in the initial stage of charging, its surface is close to a plane. When working conditions such as over-temperature and over-heat occur during the charging process, its surface will collide and deform to form a convex bulge 61 with a certain arc, and the convex bulge 61 is usually located in the middle of the cell surface, where the expansion force is also the largest. The position where the convex bulge 61 expands most significantly is selected as the position of the through hole 11, and the aperture of the through hole 11 is adjusted according to the expansion force of the cell 6. The convex bulge 61 part presses the first side 201 of the movable member 2, so that the movable member 2 moves along the X direction relative to the first support member 1 in the through hole 11, and the second side 202 of the movable member 2 presses the sensor 3, transmitting the expansion force of the cell 6 to the sensor 3. The sensor 3 is electrically connected to the BMS (Battery Management System). The sensor 3 is a pressure sensor, which can sense the pressure signal and convert the pressure signal into an electrical signal and output it to the BMS to complete the monitoring of the abnormal state of the battery.

[0035] Specifically, during the charging process of the battery cell 6, the surface thereof expands and deforms to generate a convex bulge 61, which presses against the first side 201 of the movable member 2, causing the movable member 2 to move in the negative X direction. Meanwhile, the second side 202 of the movable member 2 presses against the sensor 3. When the battery cell 6 is discharging, its surface gradually recovers from deformation, driving the movable member 2 to move in the positive X direction, and the pressing force on the sensor 3 gradually decreases. The expansion force also changes, and a pressure signal is output to the BMS. If the state of the battery cell 6 is abnormal, the BMS will give an alarm response. Exemplarily, the battery cell 6 can be safely used when the expansion force thereon is between 500N and 2000N. When it is monitored that the expansion force is greater than 2000N, the BMS gives an alarm response.

[0036] In the embodiment of the present utility model, during the charging and discharging process of the battery cell, the surface thereof expands and deforms, driving the movable member in contact with the battery cell to move relative to the first support member in the through hole. The other side of the movable member contacts the sensor, transmitting the expansion force of the battery cell to the sensor, and enabling the expansion force of the battery cell to be effectively monitored in real time, so as to remind the operator to take corresponding measures and avoid the phenomena of loss of the battery cell life, short circuit and thermal runaway when the expansion force is too large. In addition, the sensor is arranged outside the battery cell and the battery pack cross beam, and there is no need to arrange sensors between the battery cells and inside the battery pack cross beam, which is convenient for assembly and avoids affecting the force-bearing condition of the cross beam.

[0037] Optionally, referring to Figures 4 to 6 , the movable member 2 includes a first movable portion 21 and a second movable portion 22 which are connected to each other; a side of the first movable portion 21 away from the second movable portion 22 is close to the first end 111 of the through hole 11. Along the direction from the first end 111 to the second end 112 of the through hole 11, the cross-sectional area of the first movable portion 21 gradually increases, and the cross-sectional area of the second movable portion 22 gradually decreases.

[0038] Specifically, as Figures 4 to 6As shown, the movable member 2 includes a first movable portion 21 and a second movable portion 22 that are connected to each other. The first movable portion 21 and the second movable portion 22 can be integrally connected or separately connected. Taking the side where the battery cell 6 is located as the inner side and the side where the sensor 3 is located as the outer side for illustration. Among them, the first movable portion 21 is the inner side of the movable member 2 and is used to contact the battery cell 6, and the second movable portion 22 is the outer side of the movable member 2 and contacts the sensor 3. Along the direction from the first end 111 to the second end 112 of the through hole 11, that is, along the negative X direction, the cross-sectional area of the first movable portion 21 gradually increases, that is, along the negative X direction, the cross-sectional area of the first movable portion 21 increases linearly or non-linearly, or, along the negative X direction, the cross-sectional areas of two points with similar distances are equal. The cross-sectional area of the second movable portion 22 gradually decreases, that is, along the negative X direction, the cross-sectional area of the second movable portion 22 increases linearly or non-linearly, or, along the negative X direction, the cross-sectional areas of two points with similar distances are equal. The cross-sectional area at the connection of the first movable portion 21 and the second movable portion 22 is the largest, and this place abuts against the inner wall of the through hole 11. Due to the variable cross-section setting, there is a certain space between the movable member 2 and the through hole 11 to form a clearance fit, so that the movable member 2 can move along the axis of the through hole 11, that is, the X direction. The cross-sectional shape of the movable member 2 is circular or quadrilateral. In this embodiment, the cross-sectional shape of the movable member 2 is quadrilateral, and both the first movable portion 21 and the second movable portion 22 are in the shape of a frustum.

[0039] Optionally, referring to Figure 2 and Figure 5 , the second movable portion 22 protrudes from the second end 112 of the through hole 11 and extends outward.

[0040] Specifically, Figure 5 From the perspective of the second end 112 of the through hole 11, the second movable portion 22 protrudes from the second end 112 of the through hole 11, that is, the second side 202 of the movable member 2 protrudes from the second end 112 of the through hole 11 to form a boss structure, which is convenient for a good contact to be formed between the movable member 2 and the sensor 3. When the surface of the battery cell 6 expands and deforms to generate an expansion force, its surface presses the movable member 2, and the side of the movable member 2 that protrudes from the through hole 11 presses the sensor 3, and the expansion force can be transmitted to the sensor 3.

[0041] Optionally, referring to Figure 2 and Figure 4 , the first side 201 of the movable member 2 is flush with the first end 111 of the through hole 11.

[0042] Specifically, Figure 4Viewed from the perspective of the first end 111 of the through hole 11, one side of the first movable part 21 is flush with the first end 111 of the through hole 11, that is, the first side 201 of the movable member 2 is flush with the first end 111 of the through hole 11, avoiding scratching the surface of the battery cell 6 by the protruding structure. Along the X direction, one side of the first movable part 21 is flush with the first end 111 of the through hole 11, and the other side of the first movable part 21 connecting the second movable part 22 is flush with the second end 112 of the through hole 11. In other words, the length of the first movable part 21 along the X direction is the same as the length of the through hole 11. The second movable part 22 protrudes from the second end 112 of the through hole 11 as a whole. When the first movable part 21 moves in the through hole 11 under the extrusion of the battery cell 6, the second movable part 22 simultaneously presses the sensor 3.

[0043] Optionally, referring to Figure 2 and Figure 6 , the surface area of the first side 201 of the movable member 2 is S1, and the surface area of the second side 202 of the movable member 2 is S2, where S1 ≥ S2.

[0044] Specifically, as shown in Figure 2 and Figure 6 , the area of the surface of the movable member 2 in contact with the battery cell 6 is S1, that is, the surface area of one side of the first movable part 21 is S1. The area of the outer surface of the movable member 2 away from the battery cell 6 is S2, that is, the surface area of one side of the second movable part 22 is S2. Therefore, along the negative X direction, the surface area S2 of the outer side of the movable member 2 is smaller than the surface area S1 of the inner side of the movable member 2. The sensor 3 in this embodiment reflects the performance of the battery cell 6 by measuring the value of the pressure P, and has the following calculation formula: P = F / S2, where F is the expansion force of the battery cell 6. By reducing the value of S2, the surface area of the outer side of the movable member 2 is made smaller than the surface area of the inner side of the movable member 2. When the value of F changes, when taking the smaller value of S2, the change amount of the pressure P is more obvious, so that the slight change of the expansion force of the battery cell 6 during the charge and discharge process can be captured and observed, accurately and timely reflecting the performance of the battery cell 6. As shown in Figure 6 , the calculation formula between the sides of the trapezoidal cross-section of the second movable part 22 is as follows: b = a - 2*sqrt(c 2 -h 2 ), where a is the length of the upper base of the trapezoidal cross-section, that is, the length of the longer base, b is the length of the lower base of the trapezoidal cross-section, that is, the length of the shorter base, c is the length of the hypotenuse, h is the height of the trapezoidal cross-section, and sqrt represents the square root; since the surface area S2 of the outer side of the movable member 2 is related to the length of the lower base b, the length of the lower base b can be adjusted by adjusting the lengths of the upper base a, the hypotenuse c and the height h, and then the surface area S2 can be adjusted.

[0045] Optionally, referring to Figure 1 and Figure 2, the cell performance testing device further includes a second support member 4 and a stop member 5; the second support member 4 is fixedly connected to the first support member 1, the stop member 5 is connected to the second support member 4, and the stop member 5 is located on the side of the sensor 3 away from the movable member 2.

[0046] Optionally, the first support member 1 is a battery pack crossbeam.

[0047] Specifically, as Figure 1 and Figure 2 shown, when the cell performance testing device is used in a battery pack, the second support member 4 is a battery pack box body, which is made of aluminum alloy or cast iron and has the function of bearing and restraining the cell 6. The first support member 1 is a battery pack crossbeam, also known as a module end plate. The battery pack box body and the frame 7 are surrounded and connected to form a receiving space, and the battery pack crossbeam is located in the receiving space and fixedly connected to the battery pack box body. The stop member 5 is an aluminum baffle or a cast iron baffle, and the stop member 5 is connected to the battery pack box body, and the connection method includes but is not limited to welding or integral die-casting. And a sensor 3 is clamped between the stop member 5 and the movable member 2. The stop member 5 and the sensor 3 are arranged at intervals, and the distance between the two satisfies the preset safety conditions. When the cell 6 expands and deforms greatly during the charging process, the movement amplitude of the movable member 2 is large. Setting the stop member 5 forms a limiting function for the sensor 3, avoiding the sensor 3 from being squeezed by the movable member 2 to generate a large displacement and unable to accurately measure the expansion force of the cell 6. And there is a small interval distance between the stop member 5 and the sensor 3, and this distance plays a role in buffering and protecting the sensor 3, and at the same time provides a certain disassembly and maintenance space for the sensor 3.

[0048] Optionally, referring to Figure 1 and Figure 2 , a first adhesive or a first elastic member is provided between the stop member 5 and the sensor 3.

[0049] Specifically, as Figure 1 and Figure 2 shown, a bonding member, a first elastic member or a bonding member with elasticity is provided between the stop member 5 and the sensor 3. Exemplarily, double-sided adhesive tape, foaming glue or elastic sealant glue can be filled between the stop member 5 and the sensor 3. On the one hand, it can connect the stop member 5 and the sensor 3; on the other hand, when the cell 6 returns to its deformed state after the discharge process ends, due to the disappearance of the expansion force, the first elastic member or the bonding member with elasticity will push the sensor 3 to move along the positive X direction and return to its initial position for the next measurement.

[0050] Optionally, referring to Figure 1 and Figure 2 , a second adhesive or a second elastic member is provided on the first side 201 of the movable member 2.

[0051] Specifically, asFigure 1 and Figure 2 As shown in Figure 1 and Figure 2 , a second bonding member or a second elastic member is disposed on the first side 201 of the movable member 2, i.e., the first movable portion 21, facing the side of the battery cell 6. Exemplarily, a resilient foam is disposed on the first side 201 of the movable member 2. On the one hand, it can buffer the movement of the battery cell 6; on the other hand, when the battery cell 6 returns to its deformed state after the discharge process ends, it can pull the movable member 2 to move along the positive X direction to return to its initial position.

[0052] An embodiment of the present invention further provides a battery pack, including the battery cell testing device in any one of the above embodiments.

[0053] Specifically, as shown in Figure 1 and Figure 2 , the support main body of the battery pack is composed of a second support member 4, i.e., the battery pack box body, a first support member 1, i.e., the battery pack cross beam, and a frame 7. The battery cell 6 is fixed in the accommodating space of the battery pack. During the charging process, the surface of the battery cell 6 expands and deforms to generate a convex bulge 61, which presses the first side 201 of the movable member 2, causing the movable member 2 to move along the negative X direction. The second side 202 of the movable member 2 simultaneously presses the sensor 3. The sensor 3 reads the pressure signal of the expansion force and converts the pressure signal into an electrical signal and outputs it to the BMS. If the expansion force value is abnormal at this time, there will be a corresponding alarm response. During the discharge process, the surface of the battery cell 6 gradually returns to its deformed state, the movable member 2 returns to its initial position, and the extrusion force received by the sensor 3 gradually decreases. It realizes the instant monitoring of the battery cell expansion force to remind the operator to take corresponding measures to avoid the phenomenon that when the battery cell expansion force is too large, it will damage the battery cell or even the life of the battery pack and even cause short circuit and thermal runaway.

[0054] It should be noted that in this article, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0055] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims, and all of them belong to the protection scope of the present invention.​​​​

Claims

1. A battery performance testing device, characterized in that: It comprises a first supporting member (1), a movable member (2) and a sensor (3); The first support member (1) is provided with a through hole (11), the movable member (2) is movably connected in the through hole (11), the movable member (2) has a first side (201) and a second side (202), the first side (201) and the second side (202) are opposite to each other, the through hole (11) has a first end (111) and a second end (112), the first end (111) and the second end (112) are opposite to each other, the first side (201) of the movable member (2) is flush with the first end (111) of the through hole (11) or protrudes from the first end (111) of the through hole (11), the second side (202) of the movable member (2) is flush with the second end (112) of the through hole (11) or protrudes from the second end (112) of the through hole (11), and the sensor (3) is in contact with the second side (202) of the movable member (2); The first side (201) of the movable member (2) is used to contact the battery core to sense the expansion force, and the movable member (2) can move relative to the first support member (1) along the axial direction of the through hole (11).

2. The battery performance testing device according to claim 1, characterized in that: The movable member (2) comprises a first movable part (21) and a second movable part (22) which are connected to each other; A side of the first movable portion (21) away from the second movable portion (22) is close to the first end (111) of the through hole (11), and along a direction from the first end (111) of the through hole (11) toward the second end (112), the cross-sectional area of ​​the first movable portion (21) gradually increases, while the cross-sectional area of ​​the second movable portion (22) gradually decreases.

3. The battery performance testing device according to claim 2, characterized in that: The second movable portion (22) protrudes from the second end (112) of the through hole (11) and extends outwards.

4. The battery performance testing device according to claim 1, characterized in that: The first side (201) of the movable member (2) is flush with the first end (111) of the through hole (11).

5. The battery performance testing device according to claim 1, characterized in that: The surface area of ​​the first side (201) of the movable part (2) is S1, the surface area of ​​the second side (202) of the movable part (2) is S2, and S1≥S2.

6. The battery performance testing device according to any one of claims 1 to 5, characterized in that: The battery cell performance testing device also includes a second support member (4) and a stop member (5); The second support member (4) is fixedly connected to the first support member (1), the stop member (5) is connected to the second support member (4), and the stop member (5) is located on a side of the sensor (3) facing away from the movable member (2).

7. The battery performance testing device according to claim 6, characterized in that: A first adhesive member or a first elastic member is provided between the stopper (5) and the sensor (3).

8. The battery performance testing device according to claim 6, characterized in that: A second adhesive member or a second elastic member is provided on the first side (201) of the movable member (2).

9. The battery performance testing device according to any one of claims 1 to 5, characterized in that: The first support member (1) is a battery pack crossbeam.

10. A battery pack, characterized in that: A battery cell performance testing device comprising any one of claims 1 to 9.

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