Clamping tool and testing device

Abstract

The utility model provides a clamping tool and a testing device. The clamping tool comprises a clamping assembly and a pipeline assembly. The clamping assembly comprises at least two clamping pieces, the at least two clamping pieces are arranged in the first direction, and a single battery is arranged between every two adjacent clamping pieces. The clamping piece is arranged in a deformable mode in the first direction. The pipeline assembly is communicated with the clamping pieces and can conduct fluid exchange with the clamping pieces so that the length sizes of the clamping pieces in the first direction can be adjusted. The pipeline assembly is used for being connected with a fluid heating mechanism. According to the embodiment of the invention, the accuracy of obtaining the K value of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a clamping fixture and a testing device. Background Art

[0002] Battery cells are widely used in electronic devices, and their safety performance has attracted much attention. After the production of battery cells, they need to be tested for OCV (Open Circuit Voltage) to obtain the K value of the battery cell (K value refers to the voltage drop of the battery cell per unit time, reflecting the self-discharge rate of the battery cell), so as to sort out unqualified battery cells and ensure quality.

[0003] Therefore, how to improve the accuracy of obtaining the K value of a battery cell is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a clamping tool and a testing device, which are conducive to improving the accuracy of obtaining the K value of a battery cell.

[0005] In the first aspect, the present application provides a clamping tool, comprising: a clamping assembly, comprising at least two clamping members, the at least two clamping members are arranged along a first direction, a battery cell is placed between each two adjacent clamping members, and the clamping members are deformable along the first direction; a pipe assembly, connected to each clamping member, the pipe assembly can exchange fluid with each clamping member, so that the length of each clamping member along the first direction is adjustable. The pipe assembly is used to connect with a fluid heating mechanism.

[0006] In some embodiments of the first aspect, the pipe assembly is capable of injecting fluid into each clamping member, and the clamping member will extend along the first direction after the fluid is injected, so that each clamping member will squeeze the battery cell adjacent to it along the first direction. After the battery cell is squeezed, the rate at which the hard particles or metal dendrites inside it pierce the diaphragm can be accelerated, so as to improve the signal-to-noise ratio of physical self-discharge and the rate at which physical self-discharge is detected, thereby facilitating the improvement of the reliability and accuracy of the detection of physical self-discharge, and further facilitating the improvement of the accuracy of obtaining the K value of the battery cell.

[0007] In some embodiments, each clamp is configured to exchange heat with the battery cell. When the battery cell is heated up, the chemical self-discharge can be reduced, thereby facilitating the reliability and accuracy of detecting the physical self-discharge, and further facilitating the accuracy of obtaining the K value of the battery cell.

[0008] In some embodiments, the clamping member has a cavity, the pipeline assembly is connected to the cavity, and the length of the cavity along the first direction is adjustable. This arrangement has a simple structure and is easy to assemble.

[0009] In some embodiments, the clamping member includes an elastic sleeve and a frame connected to each other, the elastic sleeve has a cavity, the frame is arranged around the elastic sleeve, the frame includes first plates opposite to each other along a second direction, and a second plate connected between the opposite first plates, and the second direction is arranged to intersect with the first direction. The frame can limit the change of the length dimension of the elastic sleeve along other directions to ensure that its length dimension is adjustable only along the first direction, thereby facilitating the clamping effect of the clamping assembly on the battery cell.

[0010] In some embodiments, the elastic sleeve is bonded to the frame body, which facilitates assembly.

[0011] In some embodiments, the clamping member further comprises a support body, and the elastic sleeve is connected to the support body on either side along the first direction. When the elastic sleeve is extended along the first direction, the support body can squeeze the battery cell, which is conducive to increasing the pressure on the battery cell.

[0012] In some embodiments, the support body includes a pressing plate and a sealing frame, wherein the pressing plate is connected between the elastic sleeve and the sealing frame along a first direction. The sealing frame can cooperate with the recessed portion of the battery cell, so that the support body can fit closely with the battery cell during the process of squeezing the battery cell, so that every part of the battery cell can be squeezed.

[0013] In some embodiments, the elastic sleeve is bonded to the support body, which facilitates assembly.

[0014] In some embodiments, the clamping tool further includes a bottom support plate, which is arranged on one side of the clamping member along its own height direction, and the orthographic projection of each clamping member in the height direction falls into the bottom support plate, and the height direction is arranged to intersect with the first direction. The bottom support plate can be used to support the battery monomer to prevent the battery monomer from falling off.

[0015] In some embodiments, each clamp is connected to a bottom support plate. The bottom support plate can also be used to support the clamp assembly.

[0016] In some embodiments, the clamping tool further includes a pressure sensor, which is connected to one side of the clamping member along the first direction and is configured to detect the pressure exerted by the clamping member on the battery cell. By providing the pressure sensor, it is possible to detect whether the pressure exerted by the clamping member on the battery cell meets a preset pressure, so as to control the flow rate of the fluid injected into the clamping member by the pipeline assembly.

[0017] In some embodiments, along the first direction, a clamping member located at least on one side of the clamping assembly is connected to a pressure sensor. Such a design is convenient for reducing costs.

[0018] In some embodiments, the clamping tool further includes a limiting plate, and the pressure sensor is connected between the clamping member and the limiting plate along the first direction. The limiting plate can support the pressure sensor to prevent it from falling off.

[0019] In some embodiments, the clamp has an inlet and an outlet, the pipeline assembly includes an inlet pipe and an outlet pipe, the inlet pipe is connected to the inlet, and the outlet pipe is connected to the outlet. Such a design facilitates ensuring the effectiveness of the adjustable length of the clamp along the first direction.

[0020] In some embodiments, along the height direction of the clamping member, the height position of the inlet pipe is higher than the height position of the outlet pipe, and the height direction is arranged to intersect with the first direction. Such a design is conducive to improving the efficiency of adjusting the length dimension of the clamping member along the first direction.

[0021] In some embodiments, the inlet pipe includes a main inlet pipe and at least two sub-inlet pipes connected to the main inlet pipe, and the sub-inlet pipes are arranged one-to-one with the clamping member; the outlet pipe includes a main outlet pipe and at least two sub-outlet pipes connected to the main outlet pipe, and the sub-outlet pipes are arranged one-to-one with the clamping member. By arranging in this way, it is convenient to ensure the effectiveness of the adjustable length size of each clamping member along the first direction.

[0022] In some embodiments, the main inlet pipe is provided with a first valve, and the main outlet pipe is provided with a second valve. This arrangement facilitates the control of the opening and closing of the pipeline assembly.

[0023] In a second aspect, the present application provides a testing device, comprising a clamping tool provided according to any embodiment of the first aspect.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 A schematic diagram of the partial structure of the clamping tooling in some embodiments of the present application during use;

[0027] Figure 2 Schematic diagram of the partial structure of the clamping tooling of other embodiments of the present application during use.

[0028] The reference numerals in the specific implementation manner are as follows:

[0029] 100-clamping tool; 200-battery monomer;

[0030] 10-clamping assembly; 11-clamping member; 111-elastic sleeve; 112-frame;

[0031] 20-pipeline assembly; 21-inlet pipe; 211-main inlet pipe; 212-sub-inlet pipe; 201-first valve; 22-outlet pipe; 221-main outlet pipe; 222-sub-outlet pipe; 202-second valve;

[0032] 30-bottom support plate; 40-pressure sensor; 50-limit plate;

[0033] X-first direction; Y-second direction; Z-height direction. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0036] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0037] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] At present, battery cells are widely used in electronic devices, and their safety performance has attracted much attention. The battery cells mentioned in this application may be secondary battery cells, which refer to battery cells that can be recharged to activate active materials after discharge and continue to be used.

[0041] After the battery cells are produced, they usually need to be tested for OCV (Open Circuit Voltage) to obtain the K value of the battery cells (the K value refers to the voltage drop of the battery cells per unit time, reflecting the self-discharge rate of the battery cells) so as to sort out unqualified battery cells and ensure quality.

[0042] Therefore, how to improve the accuracy of obtaining the K value of a battery cell is a technical problem that needs to be solved urgently in battery technology.

[0043] Battery cell self-discharge can be divided into physical self-discharge and chemical self-discharge according to the different reaction types. Among them, the energy loss caused by physical self-discharge is recoverable, while the energy loss caused by chemical self-discharge is basically irreversible. It is usually necessary to detect the battery cells with physical self-discharge.

[0044] In the actual test process, the K value test signal includes two parts: physical self-discharge and chemical self-discharge. When the chemical self-discharge caused by the side reaction is not eliminated consistently, or the chemical self-discharge accounts for a large proportion, the voltage drop signal caused by the physical self-discharge will not be detected, resulting in over- and under-testing. Therefore, in order to quickly identify abnormal physical self-discharge products, it is necessary to eliminate and reduce the chemical self-discharge as much as possible, and further improve the physical self-discharge signal-to-noise ratio.

[0045] The side reaction elimination time can be extended and the reaction temperature can be increased to allow the side reactions caused by excess film-forming additives in the electrolyte to proceed in advance. In this way, the chemical side reactions of the battery cell will be maintained at a low level during the K value test, and the OCV drop caused by chemical self-discharge will be significantly reduced. The physical self-discharge OCV drop caused by diaphragm puncture of the same size will easily appear as K value scatter points.

[0046] In the related art, the heating method for battery cells is usually non-contact air blast heating, which is achieved through heat conduction or heat convection. However, this method is prone to uneven heating and has low heating efficiency. It cannot guarantee the reliability of physical self-discharge detection, and therefore cannot guarantee the accuracy of the K value of the OCV test result.

[0047] Based on the above technical problems, an embodiment of the present application provides a clamping tool, including a clamping assembly and a pipe assembly. The clamping assembly includes at least two clamping members, at least two clamping members are arranged along a first direction, and a battery cell is placed between each two adjacent clamping members. The pipe assembly is connected to each clamping member, and the pipe assembly can exchange fluid with each clamping member so that the length of each clamping member along the first direction is adjustable.

[0048] The pipeline assembly can inject fluid into each clamping member. After the fluid is injected, the clamping member will extend along the first direction so that each clamping member will squeeze the battery cell adjacent to it along the first direction. After the battery cell is squeezed, the distance between the pole piece and the diaphragm can be shortened to accelerate the rate at which the hard particles or metal dendrites inside the battery cell pierce the diaphragm, thereby improving the physical self-discharge electric-to-noise ratio and the rate at which the physical self-discharge is detected, thereby helping to improve the reliability and accuracy of the physical self-discharge detection.

[0049] See also Figure 1 and Figure 2According to an embodiment of the present application, a clamping tool 100 is provided, including a clamping assembly 10 and a pipe assembly 20. The clamping assembly 10 includes at least two clamping members 11, and at least two clamping members 11 are arranged along a first direction X, and a battery cell 200 is configured to be placed between each two adjacent clamping members 11. The clamping member is deformable along the first direction. The pipe assembly 20 is connected to each clamping member 11, and the pipe assembly 20 can exchange fluid with each clamping member 11 so that the length of each clamping member 11 along the first direction X is adjustable. The pipe assembly is used to connect to a fluid heating mechanism.

[0050] The clamping assembly 10 is used to clamp the battery cell 200 to provide a certain clamping pressure to the battery cell 200 . In some embodiments, the clamping assembly 10 can perform heat exchange with the battery cell 200 while providing pressure.

[0051] The clamping assembly 10 includes clamping members 11 spaced apart along a first direction X, and the number of the clamping members 11 can be set to two, three, or even more. The space between each two adjacent clamping members 11 is used to place a battery cell 200, wherein the number of battery cells 200 that can be placed between each two adjacent clamping members 11 can be one, two, or even more.

[0052] The first direction X may be the width direction of the clamping member 11 , or may be the width direction of the battery cell 200 .

[0053] The pipe assembly 20 is used to exchange fluid with each clamping member 11, wherein the fluid can be gas or liquid. In actual application, the clamping tool 100 provided in the embodiment of the present application can inject fluid into the clamping member 11 through the pipe assembly 20, and the clamping member 11 can be extended along the first direction X driven by the fluid to squeeze the battery cell 200. Of course, the fluid in the clamping member 11 can also flow out through the pipe assembly 20 to shorten it along the first direction X and restore it to its initial state.

[0054] In the clamping tool 100 provided in some embodiments of the present application, the pipe assembly 20 can inject fluid into each clamping member 11. After the fluid is injected, the clamping member 11 will extend along the first direction X, so that each clamping member 11 will squeeze the battery cell 200 adjacent to it along the first direction X. After the battery cell 200 is squeezed, the rate at which the hard particles or metal dendrites inside it pierce the diaphragm can be accelerated, so as to improve the signal-to-noise ratio of physical self-discharge and the rate at which physical self-discharge is detected, thereby facilitating the improvement of the reliability and accuracy of the detection of physical self-discharge, and further facilitating the improvement of the accuracy of obtaining the K value of the battery cell 200.

[0055] Optionally, in the first direction X, the orthographic projection of the battery cell 200 falls into the clamping plate, which is beneficial to increase the contact area between the clamping plate and the battery cell 200, so that the clamping assembly 10 can better squeeze the battery cell 200 to ensure the accuracy of obtaining the K value of the battery cell 200.

[0056] Optionally, the pipe assembly 20 may be a rigid pipe or a flexible pipe.

[0057] In some embodiments, the clamping member 11 may be configured to have a cavity structure, that is, the clamping member 11 may be expanded and deformed as the fluid is injected.

[0058] In other embodiments, the clamping member 11 can also be set as a hydraulic structure or a pneumatic structure. For example, the clamping member 11 includes a hydraulic top plate and a hydraulic drive rod. The hydraulic drive rod can extend along the first direction X and push the hydraulic top plate to move as the fluid is injected, and the hydraulic top plate squeezes the battery cell 200; or, the clamping member 11 includes a pneumatic top plate and a pneumatic drive rod. The pneumatic drive rod can extend along the first direction X and push the pneumatic top plate as the fluid is injected, and the hydraulic top plate squeezes the battery cell 200.

[0059] In some optional embodiments, each clamping member 11 is configured to perform heat exchange with the battery cell 200 .

[0060] The clamping member 11 can adjust the temperature of the battery cell 200 . When the battery cell 200 heats up, the chemical self-discharge can be reduced, thereby facilitating the reliability and accuracy of detecting the physical self-discharge, and further facilitating the accuracy of obtaining the K value of the battery cell 200 .

[0061] Furthermore, by configuring in this manner, the clamping member 11 can fully contact the battery cell 200 while exchanging heat with the battery cell 200 , thereby improving the heating efficiency and cooling efficiency of the battery cell 200 by the clamping tool 100 .

[0062] Optionally, the clamping member 11 can be configured to have a cavity structure, and the pipe assembly 20 can inject a fluid having a temperature difference with the battery cell 200 into each clamping member 11, so that the clamping assembly 10 can adjust the temperature of the battery cell 200 while clamping the battery cell 200 to reduce chemical self-discharge.

[0063] Optionally, the clamping tool 100 may further include a temperature regulating component, and each clamping member 11 is connected to the temperature regulating component. The temperature of each clamping member 11 is regulated by the temperature regulating component, so that each clamping member 11 can exchange heat with the battery cell 200 .

[0064] Optionally, the battery cell 200 has two opposite walls along the first direction X, and these two walls are the walls with the largest area in the battery cell 200. This arrangement is beneficial to improving the clamping effect of the clamping assembly 10 on the battery cell 200, so that the clamping pressure exerted on the battery cell 200 can quickly reach a preset pressure value, and can also increase the heat exchange rate between the clamping assembly 10 and the battery cell 200, thereby helping to improve the reliability of the clamping tooling 100.

[0065] In some optional embodiments, the clamping member 11 has a cavity, the pipe assembly 20 is connected to the cavity, and the length of the cavity along the first direction X is adjustable.

[0066] When fluid is filled into the cavity of the clamp 11 through the pipe assembly 20, the length dimension of the cavity along the first direction X increases, so that the clamp 11 expands in the first direction X, thereby being able to clamp the battery cell 200 and provide a certain clamping pressure, so that the battery cell 200 can be in a pressurized state.

[0067] The clamping tool 100 provided in some embodiments of the present application is configured in the above manner, has a simple structure, is easy to maintain, and is beneficial to reducing costs.

[0068] For example, after some battery cells 200 are produced, they can be placed in the clamping fixture 100 according to certain rules and subjected to a K value test. The K value test can include three stages, namely, the chemical side reaction elimination stage, the temperature reduction polarization elimination stage, and the voltage drop test stage.

[0069] In the chemical side reaction elimination stage, oil at 40-60°C is injected into each clamping member 11 through the pipeline assembly 20, and the internal pressure of each clamping member 11 can be increased to 0.3MP to expand it and deform along the first direction X to squeeze the battery cell 200, and the battery cell 200 is contact-pressurized and heated. After 15 minutes, the temperature of the battery cell 200 can be raised to the target temperature. This process can accelerate the elimination of chemical self-discharge and accelerate the deterioration of the working condition, that is, accelerate the metal dendrites or hard impurities to pierce the diaphragm to improve the signal-to-noise ratio of physical self-discharge.

[0070] After the battery cell 200 is heated for 4 hours, the chemical side reactions can fully occur at high temperature. At this time, the K value test cooling polarization elimination stage can be entered, that is, -10°C oil is injected into each clamping member 11 through the pipeline assembly 20 for 30 minutes to achieve rapid cooling of the battery cell 200. At this stage, the OCV test is carried out and the OCV1 value is obtained. After the cycle of heating and cooling, the temperature of each battery cell 200 can maintain a high degree of consistency, which is conducive to ensuring the accuracy of the OCV voltage test.

[0071] In the voltage drop test stage, 0°C oil is injected into each clamping member 11 through the pipe assembly 20. In this stage, an OCV test is performed and an OCV2 value is obtained. The internal temperature of the battery cell 200 can further weaken the chemical reaction under low temperature conditions to reduce chemical self-discharge, while the physical self-discharge does not weaken with the decrease in temperature, causing the abnormal signal of physical self-discharge to significantly increase the proportion in the OCV voltage drop.

[0072] Through the above test, K value = (OCV1-OCV2) / time interval, where the time interval is the time required between obtaining the OCV1 value and obtaining the OCV2 value.

[0073] The above is a K value test performed using the clamping fixture 100 provided in an embodiment of the present application, which can reduce the chemical self-reaction of the battery cell 200 and improve the signal-to-noise ratio of the physical self-reaction, thereby helping to improve the accuracy of the K value. However, it should be understood that the above is only an example, and the present application does not limit the time, temperature, and type of fluid during the test, which can be set specifically according to actual needs.

[0074] The fluid heating mechanism can inject fluids of different temperatures into the clamping member through the pipe assembly, so that the battery cell completes multiple stages while being clamped by the clamping member, thereby simplifying the test process of multiple stages and improving the test efficiency. Optionally, the fluid heating mechanism can increase the temperature of the fluid.

[0075] In some optional embodiments, the clamping member 11 includes an elastic sleeve 111 and a frame 112 connected to each other, the elastic sleeve 111 has a cavity, the frame 112 is arranged around the elastic sleeve 111, the frame 112 includes first plates opposite to each other along a second direction Y, and a second plate connected between the opposite first plates, and the second direction Y is arranged to intersect with the first direction X.

[0076] The second direction Y can be represented as the length direction of the clamp 11 , and can also be the same direction as the height direction Z of the clamp 11 . As an example, the second direction Y is the length direction of the clamp 11 , and can also be the length direction of the battery cell 200 .

[0077] The elastic sleeve 111 may be understood as a structure with elastic deformation. The elastic sleeve 111 may be made of rubber material. Optionally, the elastic sleeve 111 may include but is not limited to an oil bag.

[0078] The two first plates are arranged opposite to each other along the second direction Y, and the two second plates are arranged opposite to each other along the height direction Z. The first plates and the second plates are connected to each other to enclose a space that at least partially accommodates the elastic sleeve 111 .

[0079] The first plate is used to limit the deformation of the elastic sleeve 111 in the second direction Y, and the second plate is used to limit the deformation of the elastic sleeve 111 in the height direction Z, so that the elastic sleeve 111 can only be deformed along the first direction X, thereby ensuring the effectiveness of the adjustable length of each clamping member 11 along the first direction X.

[0080] The clamping tool 100 provided in some embodiments of the present application is configured in the above manner, and the frame 112 can limit the change in the length dimension of the elastic sleeve 111 along other directions to ensure that its length dimension is adjustable only along the first direction X. While ensuring the clamping effect of the clamping assembly 10 on the battery cell 200, the injection of fluid can be reduced, thereby helping to improve operational efficiency and reduce costs.

[0081] In some optional embodiments, the elastic sleeve 111 and the frame body 112 are interference fit, so that the elastic sleeve 111 and the frame body 112 can be detached from each other for reuse, which helps to reduce costs.

[0082] In some optional embodiments, the elastic sleeve 111 is snap-fitted with the frame 112 , so that the elastic sleeve 111 and the frame 112 can be detached from each other for reuse, which helps to reduce costs.

[0083] In some optional embodiments, the elastic sleeve 111 is bonded to the frame 112 .

[0084] Arranged in this manner, assembly is facilitated and the connection strength between the two is improved to prevent the risk of separation, thereby improving the reliability of the clamping member 11 and thus the reliability of the clamping tool 100.

[0085] In some optional embodiments, the clamping member 11 further includes a support body, and either side of the elastic sleeve 111 along the first direction X is connected to the support body.

[0086] The support body can be understood as a structure having a strength greater than that of the elastic sleeve 111 . The support body can better squeeze the battery cell 200 to increase the pressure on the battery cell 200 .

[0087] The elastic sleeve 111 is connected to a support body on one side along the first direction X, and is also connected to a support body on the other side. When the elastic sleeve 111 expands and stretches along the first direction X, the distance between the two elastic sleeves 111 along the first direction X increases. When the elastic sleeve 111 shortens along the first direction X, the distance between the two elastic sleeves 111 along the first direction X decreases.

[0088] The clamping tool 100 provided in some embodiments of the present application is configured in the above manner. When the elastic sleeve 111 is extended along the first direction X, the support body can squeeze the battery cell 200, which is beneficial to increase the pressure on the battery cell 200.

[0089] Optionally, in the first direction X, the orthographic projection of the elastic sleeve 111 falls into the supporting body, that is, the supporting body covers the elastic sleeve 111 .

[0090] This arrangement is helpful to improve the squeezing effect of the support body on the battery cell 200, thereby helping to improve the reliability of the clamping tooling.

[0091] In some optional embodiments, the support body includes a pressing plate and a sealing frame, and the pressing plate is connected between the elastic sleeve 111 and the sealing frame along the first direction X.

[0092] It is understandable that the shell of the battery cell 200 generally has an uneven structure, and a sealing frame may be provided on the pressing plate to compensate for the concave portion of the shell of the battery cell 200 according to the shape of the battery cell.

[0093] By configuring in the above manner, the sealing frame can cooperate with the concave portion of the battery cell 200 , so that the support body can fit tightly with the battery cell 200 during the process of squeezing the battery cell 200 , so that every part of the battery cell 200 can be squeezed.

[0094] Optionally, the pressing plate is bonded to the sealing frame.

[0095] In some optional embodiments, the elastic sleeve 111 is bonded to the support body.

[0096] Arranged in this manner, assembly is facilitated and the connection strength between the two is improved to prevent the risk of separation, thereby improving the reliability of the clamping tool 100.

[0097] See also Figure 2 In some optional embodiments, the clamping tool 100 also includes a bottom support plate 30, which is arranged on one side of the clamping member 11 along its own height direction Z, and the orthographic projections of each clamping member 11 in the height direction Z fall into the bottom support plate 30, and the height direction Z is arranged to intersect with the first direction X.

[0098] The fact that the orthographic projections of each clamping member 11 in the height direction Z all fall into the bottom support plate 30 can be understood as the orthographic projections of the bottom support plate 30 in the height direction Z can cover each clamping member 11 .

[0099] Specifically, the orthographic projection of the space between each two adjacent clamping members 11 in the height direction Z falls into the bottom support plate 30 , so that the orthographic projection of the battery cell 200 placed in the space in the height direction Z can fall into the bottom support plate 30 .

[0100] The clamping tool 100 provided in some embodiments of the present application can be used to support the battery cell 200 by providing a bottom support plate 30 to prevent the battery cell 200 from falling off.

[0101] Optionally, the number of the bottom support plates 30 can be set to one, two, or more.

[0102] Illustratively, in the embodiment of the present application, the number of the bottom support plate 30 is set to one, which is beneficial to reducing costs and also helps to reduce assembly time.

[0103] In some optional embodiments, each clamping member 11 is connected to the bottom support plate 30 .

[0104] By configuring in this manner, the bottom support plate 30 can also be used to support and fix the clamping assembly 10 , which helps to improve the integration of the clamping tool 100 and reduce the space occupied by the clamping tool 100 .

[0105] Please continue reading Figure 1 In some optional embodiments, the clamping tool 100 further includes a pressure sensor 40 , which is connected to one side of the clamping member 11 along the first direction X and is configured to detect the pressure of the clamping member 11 on the battery cell 200 .

[0106] The pressure sensor 40 is used to detect the pressure of the clamping member 11 connected thereto, so as to obtain the pressure of the clamping member 11 acting on the battery cell 200 .

[0107] By providing the pressure sensor 40 , it is possible to detect whether the pressure exerted by the clamp 11 on the battery cell 200 meets the preset pressure, so as to control the flow rate of the fluid injected into the clamp 11 by the pipe assembly 20 , thereby facilitating improving the accuracy of the test result.

[0108] In some embodiments, each clamping member 11 may be connected to a pressure sensor 40 to improve the accuracy of detection.

[0109] In other embodiments, some clamping members 11 may be connected to pressure sensors 40 to help reduce usage costs.

[0110] In some optional embodiments, along the first direction X, the clamping member 11 located on at least one side of the clamping assembly 10 is connected to a pressure sensor 40. Such a design is easy to reduce costs and facilitate assembly.

[0111] Optionally, the clamping member 11 located on one side of the clamping assembly 10 along the first direction X is connected to a pressure sensor 40 .

[0112] Optionally, the clamping members 11 located on both sides of the clamping assembly 10 along the first direction X are connected to pressure sensors 40 .

[0113] In some optional embodiments, the clamping tool 100 further includes a limiting plate 50 , and the pressure sensor 40 is connected along the first direction X between the clamping member 11 and the limiting plate 50 .

[0114] The limiting plate 50 is used to fix the pressure sensor 40 to prevent it from falling down as the clamping member 11 moves.

[0115] The clamping tool 100 provided in some embodiments of the present application can support the pressure sensor 40 by providing a limit plate 50 to prevent the pressure sensor 40 from falling off, which is beneficial to improving the reliability of the clamping tool 100.

[0116] Optionally, the limiting plate 50 is connected to the bottom supporting plate 30 .

[0117] In some optional embodiments, the clamp 11 has an inlet and an outlet, and the pipe assembly 20 includes an inlet pipe 21 and an outlet pipe 22 , the inlet pipe 21 is connected to the inlet, and the outlet pipe 22 is connected to the outlet.

[0118] Specifically, the elastic sleeve 111 has an inlet and an outlet, and both the inlet and the outlet are connected to the cavity.

[0119] The external fluid can flow into the clamping member 11 through the inlet pipe 21 , and the fluid in the clamping member 11 can flow into the outlet pipe 22 through the outlet and flow out.

[0120] The clamping tool 100 provided in some embodiments of the present application is configured in the above manner, which facilitates ensuring the effectiveness of the adjustable length dimension of the clamping member 11 along the first direction X, and also facilitates maintenance of the pipeline assembly 20.

[0121] In some optional embodiments, along the height direction Z of the clamping member 11 , the height position of the inlet pipe 21 is higher than the height position of the outlet pipe 22 , and the height direction Z intersects with the first direction X.

[0122] By arranging the inlet pipe 21 above the outlet pipe 22, the fluid can flow into the clamping member 11 from the inlet pipe better, and flow into the outlet pipe 22 from the clamping member 11, which is beneficial to improving the heat exchange efficiency between the clamping member 11 and the battery cell 200, thereby helping to improve the efficiency of adjusting the length dimension of the clamping member 11 along the first direction X.

[0123] Please continue reading Figure 1 In some optional embodiments, the inlet pipe 21 includes a main inlet pipe 211 and at least two sub-inlet pipes 212 connected to the main inlet pipe 211, and the sub-inlet pipes 212 are arranged one-to-one with the clamping member 11.

[0124] The clamping tool 100 provided in some embodiments of the present application is configured in the above manner, which facilitates ensuring the effectiveness of the adjustable length dimension of each clamping member 11 along the first direction X, and is also conducive to reducing costs.

[0125] In some optional embodiments, the main inlet pipe 211 is provided with a first valve 201 , and the main outlet pipe 221 is provided with a second valve 202 .

[0126] The first valve 201 is used to control the opening and closing of the main inlet pipe 211, that is, to control whether the external fluid can enter the main inlet pipe 211, and the second valve 202 is used to control the opening and closing of the main outlet pipe 221, that is, to control whether the fluid in the main outlet pipe 221 can flow out to the outside.

[0127] The clamping tool 100 provided in some embodiments of the present application is configured in the above manner to facilitate controlling the opening and closing of the pipeline assembly 20 .

[0128] In a second aspect, the present application provides a testing device, comprising a clamping tool 100 provided according to any embodiment of the first aspect.

[0129] The testing device provided in some embodiments of the present application can use the clamping fixture 100 to perform OCV testing on the battery cell 200 to obtain a K value with high accuracy, which is beneficial to improving the reliability of the testing device.

[0130] Please also read Figure 1 and Figure 2 The embodiment of the present application provides a clamping tool 100, including a clamping assembly 10, a pipeline assembly 20, a bottom support plate 30, a pressure sensor 40 and a limit plate 50.

[0131] The clamping assembly 10 includes at least two clamping members 11, each clamping member 11 has an inlet and an outlet, and the at least two clamping members 11 are arranged along the first direction X. A battery cell 200 is placed between each two adjacent clamping members 11, and each clamping member 11 is configured to exchange heat with the battery cell 200.

[0132] The clamping member 11 includes an elastic sleeve 111, a frame 112 and a support body, and the frame 112 and the support body are both bonded to the elastic sleeve 111. The elastic sleeve 111 has a cavity, and the frame 112 is arranged around the elastic sleeve 111. The frame 112 includes first plates opposite to each other along a second direction Y, and a second plate connected between the opposite first plates, and the second direction Y is arranged to intersect with the first direction X. The support body includes a pressing plate and a sealing frame, and the pressing plate is connected between the elastic sleeve 111 and the sealing frame along the first direction X.

[0133] The pipeline assembly 20 is connected to each cavity, and the pipeline assembly 20 can exchange fluid with each clamping member 11 so that the length of each cavity along the first direction X is adjustable. The pipeline assembly 20 includes an inlet pipe 21 and an outlet pipe 22, the inlet pipe 21 is connected to the inlet, and the outlet pipe 22 is connected to the outlet. Along the height direction Z of the clamping member 11, the height position of the inlet pipe 21 is higher than the height position of the outlet pipe 22, and the height direction Z intersects with the first direction X. The inlet pipe 21 includes a main inlet pipe 211 and at least two sub-inlet pipes 212 connected to the main inlet pipe 211, and the sub-inlet pipes 212 are arranged one-to-one with the clamping member 11. The outlet pipe 22 includes a main outlet pipe 221 and at least two sub-outlet pipes 222 connected to the main outlet pipe 221, and the sub-outlet pipes 222 are arranged one-to-one with the clamping member 11. The main inlet pipe 211 is provided with a first valve 201, and the main outlet pipe 221 is provided with a second valve 202.

[0134] The bottom support plate 30 is arranged on one side of the clamping member 11 along its own height direction Z, each clamping member 11 is connected to the bottom support plate 30, and the orthographic projection of each clamping member 11 in the height direction Z falls into the bottom support plate 30. Along the first direction X, the clamping member 11 located on at least one side of the clamping assembly 10 is connected to a pressure sensor 40, and the pressure sensor 40 is configured to detect the pressure of the clamping member 11 acting on the battery cell 200. The pressure sensor 40 is connected between the clamping member 11 and the limit plate 50 along the first direction X.

[0135] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A clamping tool, characterized in that: include: A clamping assembly, comprising at least two clamping members, wherein at least two of the clamping members are arranged along a first direction, a battery cell is arranged between each two adjacent clamping members, and the clamping members are deformable along the first direction; A pipe assembly is connected to each of the clamping members, and the pipe assembly can exchange fluid with each of the clamping members so that the length of each of the clamping members along the first direction is adjustable. The pipe assembly is used to connect to a fluid heating mechanism.

2. The clamping tool according to claim 1, characterized in that: Each of the clamping members is configured to perform heat exchange with the battery cells.

3. The clamping tool according to claim 1, characterized in that: The clamping member has a cavity, the pipeline assembly is connected to the cavity, and the length of the cavity along the first direction is adjustable.

4. The clamping tool according to claim 3, characterized in that: The clamping member includes an elastic sleeve and a frame that are connected to each other. The elastic sleeve has the cavity. The frame is arranged around the elastic sleeve. The frame includes first plates opposite to each other along a second direction and a second plate connected between the first plates opposite to each other. The second direction is arranged to intersect with the first direction.

5. The clamping tool according to claim 4, characterized in that: The elastic sleeve is bonded to the frame.

6. The clamping tool according to claim 4, characterized in that: The clamping member further comprises a supporting body, and the supporting body is connected to either side of the elastic sleeve along the first direction.

7. The clamping tool according to claim 6, characterized in that: The support body includes a pressing plate and a sealing frame, and the pressing plate is connected between the elastic sleeve and the sealing frame along the first direction.

8. The clamping tool according to claim 6, characterized in that: The elastic sleeve is bonded to the support body.

9. The clamping tool according to any one of claims 1 to 8, characterized in that: The clamping tool also includes a bottom support plate, which is arranged on one side of the clamping member along its own height direction, and the orthographic projections of each clamping member in the height direction fall into the bottom support plate, and the height direction is arranged to intersect with the first direction.

10. The clamping tool according to claim 9, characterized in that: Each of the clamping members is connected to the bottom supporting plate.

11. The clamping tool according to any one of claims 1 to 8, characterized in that: The clamping tool further includes a pressure sensor, which is connected to one side of the clamping member along the first direction and is configured to detect the pressure of the clamping member acting on the battery cell.

12. The clamping tool according to claim 11, characterized in that: Along the first direction, the clamping member located on at least one side of the clamping assembly is connected to the pressure sensor.

13. The clamping tool according to claim 11, characterized in that: The clamping tool further includes a limiting plate, and the pressure sensor is connected between the clamping member and the limiting plate along the first direction.

14. The clamping tool according to any one of claims 1 to 8, characterized in that: The clamping member has an inlet and an outlet, and the pipeline assembly includes an inlet pipe and an outlet pipe, the inlet pipe is connected to the inlet, and the outlet pipe is connected to the outlet.

15. The clamping tool according to claim 14, characterized in that: Along the height direction of the clamping member, the height position of the inlet pipe is higher than the height position of the outlet pipe, and the height direction is arranged to intersect with the first direction.

16. The clamping tool according to claim 14, characterized in that: The inlet pipe comprises a main inlet pipe and at least two sub-inlet pipes connected to the main inlet pipe, and the sub-inlet pipes are arranged one-to-one with the clamping member; The outlet pipe includes a main outlet pipe and at least two sub-outlet pipes connected to the main outlet pipe, and the sub-outlet pipes are arranged one-to-one with the clamping member.

17. The clamping tool according to claim 16, characterized in that: The main inlet pipe is provided with a first valve, and the main outlet pipe is provided with a second valve.

18. A testing device, characterized in that: Comprising the clamping tool as described in any one of claims 1 to 17.

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