Battery extrusion test device and test method

Abstract

The invention relates to a battery extrusion testing device and method, in the device, a fixing assembly is arranged on a supporting assembly, a control module is connected with an extrusion head, and the fixing assembly fixes a to-be-tested battery; the extrusion head extrudes at least two extrusion positions of the to-be-detected battery; the control module controls the extrusion head to move in at least two extrusion directions; the extrusion directions are in one-to-one correspondence with the extrusion positions, so that the extrusion test of the to-be-tested battery at different extrusion positions is realized. Compared with a traditional mode of fixing the to-be-tested battery through an adhesive tape, the testing reliability is greatly improved, and the number of times of testing interruption caused by abnormity is reduced. The testing device is simple in structure and can be suitable for to-be-tested batteries of different sizes and models; the extrusion test is performed on at least two extrusion positions of the to-be-tested battery, so that the obtained test result can more accurately represent the extrusion resistance of the to-be-tested battery, and the result error of the extrusion resistance test of the battery is reduced.

Description

Technical Field

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

[0002] As the installed capacity of batteries increases, battery safety is receiving more and more attention. In order to ensure that battery products are highly safe, batteries are usually subjected to full-category safety tests before leaving the factory. In full-category safety tests, the extrusion test is used to evaluate the safety of the battery after a certain degree of deformation when the application product collides, and is one of the important methods to characterize the safety performance of the battery.

[0003] At present, in the existing battery extrusion test, the reliability of the test structure is low and the test method is single, which leads to large errors in the results of the battery extrusion resistance test. Summary of the invention

[0004] Based on this, a battery extrusion testing device and a testing method are provided.

[0005] In a first aspect, the present application provides a battery compression testing device, comprising:

[0006] Support components;

[0007] A fixing component, which is arranged on the supporting component and is used to fix the battery to be tested;

[0008] An extrusion head, which is used to squeeze at least two extrusion positions of the battery to be tested;

[0009] A control module is connected to the extrusion head, and the control module is configured to control the extrusion head to move along at least two extrusion directions; each extrusion direction corresponds to each extrusion position.

[0010] In one of the embodiments, the fixing assembly is provided with a receiving groove, and the receiving groove is used to receive the battery to be tested.

[0011] In one embodiment, the support assembly includes a support plate set and a support block;

[0012] The support block is arranged on the support plate group, and an avoidance groove is arranged on the support block; the avoidance groove is connected to the accommodating groove, and the avoidance groove is used to avoid the explosion-proof valve of the battery to be tested when the explosion-proof valve of the battery to be tested is arranged adjacent to the support block.

[0013] In one embodiment, the support plate set includes a first support plate and a second support plate;

[0014] The first support plate and the second support plate are arranged based on a preset angle, and the support block is fixed on the first support plate and / or the second support plate.

[0015] In one embodiment, the fixing assembly includes a first fixing module and a second fixing module; the first fixing module is provided with a first groove; the second fixing module is provided with a limiting notch;

[0016] The first fixing module is arranged on the supporting plate group, the second fixing module is arranged on the first fixing module, and the limiting notch and the first groove are enclosed to form a receiving groove;

[0017] The second fixing module is used to limit the battery to be tested disposed in the accommodating groove based on a first direction.

[0018] In one embodiment, the first fixing module includes a plurality of first fixing blocks, and the second fixing module includes a plurality of second fixing blocks; each first fixing block is arranged in one-to-one correspondence with each second fixing block;

[0019] The first fixing block is provided with first sub-grooves, and the first sub-grooves are enclosed to form a first groove;

[0020] The second fixing block is provided with first notches, and the first notches are enclosed to form a limiting notch.

[0021] In one embodiment, a first fixing block adjacent to the supporting block is provided with a first protrusion, and the first protrusion is used to limit the battery to be tested disposed in the accommodating groove based on the second direction;

[0022] And / or, the first fixing block away from the supporting block is provided with a second protrusion, and the second protrusion is used to limit the battery to be tested arranged in the accommodating groove based on the second direction.

[0023] In one embodiment, the first fixing block away from the supporting block is provided with a long through hole, and the supporting plate group is provided with a mounting through hole;

[0024] The first fixing block is fixed on the support plate group through the first fastener passing through the elongated through hole and the mounting through hole; the elongated through hole is used to adjust the relative position of the first fixing block and the support plate group.

[0025] In one of the embodiments, the arc angle of the accommodating groove is greater than 180°.

[0026] In one embodiment, the moving speed of the extrusion head is 2 mm / s to 20 mm / s.

[0027] In one embodiment, a first insulating layer is disposed on the surface of the fixing component, and a second insulating layer is disposed on the surface of the supporting component.

[0028] In one of the embodiments, the battery compression testing device further includes a testing table; the supporting assembly is disposed on the testing table.

[0029] In a second aspect, the present application further provides a battery squeeze test method, which is applied to any of the battery squeeze test devices described above, and the battery squeeze test method comprises the following steps:

[0030] Based on the preset intrusion amount, the extrusion head is controlled to move along at least two extrusion directions so that the extrusion head extrudes at least two extrusion positions of the battery to be tested; each extrusion direction corresponds to each extrusion position one by one;

[0031] The current first test data of the battery to be tested after squeezing is obtained, and the squeezing result of the battery to be tested is obtained according to the current first test data.

[0032] In one embodiment, the battery compression test method further includes the steps of:

[0033] Obtaining current second test data of samples of the current test batch; the current second test data is obtained by testing the samples of the current test batch after squeezing based on a preset intrusion amount; the samples of the current test batch include at least 2 batteries to be tested from the same batch;

[0034] Comparing the current second test data with the preset judgment condition, and adjusting the preset intrusion amount according to the comparison result;

[0035] The maximum intrusion amount of the battery to be tested is determined according to the preset intrusion amount after corresponding adjustment.

[0036] In one embodiment, the step of comparing the current second test data with the preset determination condition and adjusting the preset intrusion amount according to the comparison result includes:

[0037] When the current second test data meets the preset judgment condition, the preset intrusion amount is increased by the first step value, and the next second test data of the next test batch of samples is obtained, until the next second test data does not meet the preset judgment condition;

[0038] The step of determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount includes:

[0039] When the next second test data does not meet the preset determination condition, the preset intrusion amount corresponding to the previous second test data is determined as the maximum intrusion amount.

[0040] In one embodiment, the step of comparing the current second test data with the preset determination condition and adjusting the preset intrusion amount according to the comparison result further includes:

[0041] When the current second test data does not meet the preset judgment condition, the preset intrusion amount is reduced by the first step value, and the next second test data of the next test batch of samples is obtained, until the next second test data meets the preset judgment condition;

[0042] The step of determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount includes:

[0043] When the next second test data meets the preset determination condition, the preset intrusion amount corresponding to the next second test data is determined as the maximum intrusion amount.

[0044] In one embodiment, based on a preset intrusion amount, the step of controlling the extrusion head to move along at least two extrusion directions so that the extrusion head extrudes at least two extrusion positions of the battery to be tested comprises:

[0045] Adjust the current state of the battery to be tested to a preset test state;

[0046] The step of obtaining the current first test data of the battery to be tested after squeezing includes:

[0047] The squeezed battery to be tested is left to stand for a preset time.

[0048] In one of the embodiments, the current second test data includes any group or any combination of the following: leakage data, fire data, and explosion data.

[0049] In one embodiment, the step of determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount includes:

[0050] According to the maximum intrusion amount, the preset judgment conditions and the current second test data, an extrusion intrusion performance evaluation table is obtained.

[0051] One of the above technical solutions has the following advantages and beneficial effects:

[0052] The above-mentioned battery extrusion test device includes a supporting component, a fixing component, an extrusion head and a control module. The fixing component is arranged on the supporting component, the control module is connected to the extrusion head, and the fixing component is used to fix the battery to be tested; the extrusion head is used to squeeze at least two extrusion positions of the battery to be tested; the control module is configured to control the extrusion head to move along at least two extrusion directions; each extrusion direction corresponds to each extrusion position one by one, so as to realize the extrusion test of the battery to be tested at different extrusion positions. Compared with the traditional method of fixing the battery to be tested with tape, the test device of the present application greatly improves the test reliability and reduces the number of test interruptions caused by abnormalities. The test device has a simple structure and can be applied to batteries of different sizes and models to be tested; by performing an extrusion test on the battery to be tested at at least two extrusion positions, the test results obtained can more accurately characterize the extrusion resistance of the battery to be tested, and reduce the error of the battery extrusion resistance test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1This is a schematic diagram of the exploded structure of a battery extrusion test device in an embodiment of the present application;

[0054] Figure 2 This is a schematic diagram of the structure of the support assembly in the embodiment of the present application;

[0055] Figure 3 This is a schematic diagram of the structure of the fixing assembly in the embodiment of the present application;

[0056] Figure 4 This is a schematic diagram of the structure of the receiving groove of the battery extrusion test device in the embodiment of the present application;

[0057] Figure 5 A schematic diagram of the battery side extrusion of the battery extrusion testing device in an embodiment of the present application;

[0058] Figure 6 A schematic diagram of the battery side extrusion position of the battery extrusion test method in an embodiment of the present application;

[0059] Figure 7 A schematic diagram of the top surface extrusion of a battery in a battery extrusion testing device in an embodiment of the present application;

[0060] Figure 8 A schematic diagram of the battery top surface extrusion position in the battery extrusion test method in an embodiment of the present application;

[0061] Fig. 9 A schematic diagram of battery bottom surface extrusion of a battery extrusion testing device in an embodiment of the present application;

[0062] Fig.10 A schematic diagram of the battery bottom surface extrusion position in the battery extrusion test method in an embodiment of the present application;

[0063] Fig.11 This is a schematic diagram of a first process of a battery extrusion test method in an embodiment of the present application;

[0064] Fig.12 This is a second flow chart of the battery extrusion test method in an embodiment of the present application;

[0065] Fig.13 A third flow chart of the battery extrusion test method in an embodiment of the present application;

[0066] Fig.14 This is a schematic diagram of a fourth process of the battery extrusion test method in an embodiment of the present application;

[0067] Fig.15 This is a fifth flow chart of the battery extrusion test method in an embodiment of the present application.

[0068] Reference numerals:

[0069] 10. Support assembly; 110. Support plate group; 112. First support plate; 114. Second support plate; 120. Support block; 122. Avoidance groove; 130. Mounting through hole; 20. Fixing assembly; 200. Accommodating groove; 210. First fixing module; 212. First groove; 214. First fixing block; 2142. First sub-groove; 2144. First protrusion; 2146. Long through hole; 220. Second fixing module; 222. Limiting notch; 224. Second fixing block; 2242. First notch; 2244. Second protrusion; 30. Extrusion head; 410. Upper extrusion point on the side; 420. Center extrusion point on the side; 430. Lower extrusion point on the side; 440. Center extrusion point on the top surface; 450. Edge extrusion point on the top surface; 460. Center extrusion point on the bottom surface; 470. Edge extrusion point on the bottom surface; 50. Battery to be tested; 60. Test bench. DETAILED DESCRIPTION

[0070] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0071] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0072] In addition, the term "plurality" shall mean two or more.

[0073] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0074] In one embodiment, Figures 1 to 3As shown, a battery temperature regulating device is provided, including a supporting component 10, a fixing component 20, an extrusion head 30 and a control module, wherein the fixing component 20 is arranged on the supporting component 10, and the fixing component 20 is used to fix the battery 50 to be tested; the extrusion head 30 is used to extrude at least two extrusion positions of the battery 50 to be tested; the control module is connected to the extrusion head 30, and the control module is configured to control the extrusion head 30 to move along at least two extrusion directions; each extrusion direction corresponds to each extrusion position one by one.

[0075] Among them, the battery 50 to be tested can be a cylindrical battery, for example, the battery 50 to be tested can be a cylindrical battery of model 4695, the radius of the battery is 23mm, and the height of the battery including the positive electrode column is 97mm. In another example, the battery 50 to be tested can also be a cylindrical battery of other models, for example, the battery 50 to be tested can be a cylindrical battery of different heights and different material systems of the 46XX series. The extrusion position refers to the position of the extrusion point where the extrusion head 30 contacts the battery 50 to be tested. The extrusion position of the battery 50 to be tested includes at least 2, for example, the bottom surface of the battery 50 to be tested is provided with an extrusion position, the top surface of the battery 50 to be tested is provided with an extrusion position, and the side surface of the battery 50 to be tested is provided with an extrusion position. Exemplarily, the extrusion positions of the battery 50 to be tested include 7, including the center point of the positive electrode column on the top surface of the battery, the edge point of the top surface of the battery (such as 15 mm from the center of the positive electrode column), the extrusion point on the side of the battery (such as 5 mm from the top surface), the center point of the side of the battery, the extrusion point on the lower side of the battery (such as 5 mm from the bottom surface), the center of the bottom surface of the battery, and the edge point of the bottom surface of the battery (such as 15 mm from the center of the bottom surface).

[0076] The supporting component 10 can be used to support the fixing component 20. For example, the supporting component 10 is provided with a plurality of first through holes, and the fixing component 20 is provided with a plurality of second through holes. The fixing component 20 is locked on the supporting component 10 by fasteners passing through the corresponding first through holes and the second through holes, thereby realizing the installation of the fixing component 20 on the supporting component 10.

[0077] The fixing component 20 can be used to fix the battery 50 to be tested. For example, the fixing component 20 can be adjusted to be installed in the installation position of the support component 10, so that batteries 50 to be tested of different sizes can be fixed by the fixing component 20, thereby improving the versatility of the battery compression test.

[0078] The extrusion head 30 may be in the form of an elongated strip, and the extrusion head 30 has an extrusion end, and the extrusion end may be in the form of a semi-spherical structure. For example, the radius of the extrusion end may be between 15 mm and 30 mm. The extrusion head 30 is used to extrude the battery 50 to be tested. For example, the extrusion head 30 may extrude the battery 50 to be tested along at least two extrusion directions to achieve at least two extrusion positions of the battery 50 to be tested. For example, the extrusion directions include a first direction, a second direction, and a third direction, and the extrusion positions include the center of the bottom surface of the battery corresponding to the first direction, the center of the top surface of the battery corresponding to the second direction, and the center of the side surface of the battery corresponding to the third direction.

[0079] The control module can be a propulsion device of the extrusion tester, and the control module can be used to drive the extrusion head 30 to move. Based on the control module connecting the extrusion head 30, the control module can control the extrusion head 30 to move in the first direction, so that the extrusion head 30 squeezes the center of the bottom surface of the battery 50 to be tested, and realizes the extrusion test of the center of the bottom surface of the battery; similarly, the control module can control the extrusion head 30 to move in the second direction, so that the extrusion head 30 squeezes the center of the top surface of the battery 50 to be tested, and realizes the extrusion test of the center of the top surface of the battery; the control module can control the extrusion head 30 to move in the third direction, so that the extrusion head 30 squeezes the center of the side surface of the battery 50 to be tested, and realizes the extrusion test of the center of the side surface of the battery, and then performs the extrusion test of the battery 50 to be tested at different positions, so that the test results can more accurately characterize the extrusion resistance of the battery under different pressure states, and provide a reliable basis for the improvement of the safety performance of the battery 50 to be tested and the design of the mechanical protection device of the battery system.

[0080] In the above-mentioned embodiment, it includes a support component 10, a fixing component 20, an extrusion head 30 and a control module. The fixing component 20 is arranged on the support component 10, and the control module is connected to the extrusion head 30. The fixing component 20 is used to fix the battery 50 to be tested; the extrusion head 30 is used to extrude at least two extrusion positions of the battery 50 to be tested; the control module is configured to control the extrusion head 30 to move along at least two extrusion directions; each extrusion direction corresponds to each extrusion position one by one, so as to realize the extrusion test of the battery 50 to be tested at different extrusion positions. Compared with the traditional method of fixing the battery 50 to be tested with tape, the test device of the present application greatly improves the test reliability and reduces the number of test interruptions caused by abnormalities. Moreover, the test device has a simple structure and can be applied to batteries 50 to be tested of different sizes and models; by performing an extrusion test on the battery 50 to be tested at at least two extrusion positions, the test results obtained can more accurately characterize the extrusion resistance performance of the battery 50 to be tested, and reduce the result error of the battery extrusion resistance test.

[0081] In one embodiment, Figure 3 and Figure 4As shown, the fixing assembly 20 is provided with a receiving groove 200 , and the receiving groove 200 is used to receive the battery 50 to be tested.

[0082] The receiving groove 200 is used to receive the battery to be tested 50, and the shape and size of the receiving groove 200 can be determined according to the shape and size of the battery to be tested 50. For example, if the battery to be tested 50 is a cylindrical battery, the receiving groove 200 is in an arc shape.

[0083] Exemplarily, the accommodating groove 200 has a first opening, a second opening and a third opening, and the side of the battery 50 to be tested can be embedded from the third opening, so that the battery 50 to be tested is set in the accommodating groove 200, the bottom surface of the battery 50 to be tested faces the first opening, and the top surface of the battery 50 to be tested faces the second opening (or the bottom surface of the battery 50 to be tested faces the second opening, and the top surface of the battery 50 to be tested faces the first opening), so that the extrusion head 30 can perform an extrusion test on the bottom surface or the top surface of the battery 50 to be tested from the first opening (or the second opening), and the extrusion head 30 can perform an extrusion test on the side of the battery 50 to be tested from the third opening, thereby realizing the extrusion test of the battery 50 to be tested at different extrusion positions, and the test results obtained can more accurately characterize the extrusion resistance performance of the battery 50 to be tested, reduce the result error of the battery extrusion resistance test, improve the test reliability, and reduce the number of test interruptions caused by abnormalities.

[0084] In one embodiment, Figure 1 and Figure 2 As shown, the support assembly 10 includes a support plate group 110 and a support block 120; the support block 120 is arranged on the support plate group 110, and the support block 120 is provided with an avoidance groove 122; the avoidance groove 122 is connected to the accommodating groove 200, and the avoidance groove 122 is used to avoid the explosion-proof valve of the battery 50 to be tested when the explosion-proof valve of the battery 50 to be tested is arranged adjacent to the support block 120.

[0085] The support plate group 110 may be composed of a plurality of support plates, and the support block 120 may be arranged on the support plate group 110 by screwing. For example, the support block 120 is provided with a through hole, and a corresponding fastener (such as a bolt) may be passed through the through hole of the support block 120 to be locked on the support plate group 110, thereby realizing a fixed connection between the support block 120 and the support plate group 110. The support block 120 is provided with an avoidance groove 122, which corresponds to the accommodating groove 200, and the accommodating groove 200 is communicated with the avoidance groove 122. For example, an explosion-proof valve is provided on the bottom surface of the battery 50 to be tested, and the second opening of the accommodating groove 200 is adjacent to and connected to the avoidance groove 122. When the battery 50 to be tested is arranged in the accommodating groove 200, if the bottom surface of the battery 50 to be tested is adjacent to the avoidance groove 122, that is, when the explosion-proof valve of the battery 50 to be tested is arranged adjacent to the support block 120, the explosion-proof valve of the battery 50 to be tested can be avoided, and the distance between the explosion-proof valve and the support block 120 is increased, so that the explosion-proof valve can be normally opened when the battery 50 to be tested is thermally runaway, thereby improving the safety and reliability of the battery extrusion test.

[0086] In one embodiment, Figure 1 and Figure 2 As shown, the support plate group 110 includes a first support plate 112 and a second support plate 114 ; the first support plate 112 and the second support plate 114 are arranged based on a preset angle, and the support block 120 is fixed on the first support plate 112 and / or the second support plate 114 .

[0087] The preset angle between the first support plate 112 and the second support plate 114 may be 90°, that is, the first support plate 112 and the second support plate 114 are arranged vertically. The first support plate 112 and the second support plate 114 may be fixedly connected by screwing, for example, the support plate group 110 further includes a connecting block, the first support plate 112 and the second support plate 114 are respectively provided with corresponding through holes, and the connecting block is provided with corresponding through holes, and then one side of the connecting block can be locked to the first support plate 112 by a fastener (such as a bolt), and the other side of the connecting block can be locked to the second support plate 114, thereby achieving fixed connection between the first support plate 112 and the second support plate 114.

[0088] The support block 120 can be locked on the first support plate 112 by corresponding fasteners (such as bolts). In another example, the support block 120 can be locked on the second support plate 114 by corresponding fasteners, thereby achieving a fixed connection between the support block 120 and the first support plate 112 and / or the second support plate 114.

[0089] In one embodiment, Figure 1 and Figure 3As shown, the fixing assembly 20 includes a first fixing module 210 and a second fixing module 220; the first fixing module 210 is provided with a first groove 212; the second fixing module 220 is provided with a limiting notch 222; the first fixing module 210 is arranged on the support plate group 110, the second fixing module 220 is arranged on the first fixing module 210, and the limiting notch 222 and the first groove 212 are enclosed to form an accommodating groove 200; the second fixing module 220 is used to limit the battery 50 to be tested arranged in the accommodating groove 200 based on the first direction.

[0090] Among them, the first fixing module 210 can be set on the support plate group 110 by screwing, and the first groove 212 can be an arc groove, and the first groove 212 is used to accommodate the battery 50 to be tested. The second fixing module 220 can be set on the first fixing module 210 by screwing, and the limiting notch 222 corresponds to the first groove 212, so that the first groove 212 and the limiting notch 222 are enclosed to form the accommodating groove 200. By setting the second fixing module 220 on the first fixing module 210, the battery 50 to be tested in the accommodating groove 200 can be limited based on the first direction, such as the first direction is the radial direction of the battery 50 to be tested, and the movement of the battery 50 to be tested in the radial direction can be limited. Furthermore, when it is necessary to adjust the installation direction of the battery 50 to be tested, the battery 50 to be tested can be taken out by disassembling the second fixing module 220, thereby improving the convenience of disassembling and assembling the battery 50 to be tested and simplifying the structure of the testing device.

[0091] In one embodiment, Figure 1 and Figure 3 As shown, the first fixing module 210 includes a plurality of first fixing blocks 214, and the second fixing module 220 includes a plurality of second fixing blocks 224; each first fixing block 214 is arranged in a one-to-one correspondence with each second fixing block 224; the first fixing block 214 is provided with a first sub-groove 2142, and each first sub-groove 2142 is enclosed to form a first groove 212; the second fixing block 224 is provided with a first notch 2242, and each first notch 2242 is enclosed to form a limiting notch 222.

[0092] For example, the first fixing module 210 may include at least two first fixing blocks 214, such as the first fixing module 210 includes three first fixing blocks 214; the second fixing module 220 may include at least two second fixing blocks 224, such as the second fixing module 220 includes three second fixing blocks 224, each first fixing block 214 and each second fixing block 224 is provided with a corresponding through hole, the first fixing block 214 can be fastened to the support plate group 110 by bolts and gaskets, and the second fixing block 224 can be fastened to the corresponding first fixing block 214 by bolts.

[0093] The first fixing block 214 is provided with a first sub-groove 2142, which may be an arc-shaped groove. The second fixing block 224 is provided with a first notch 2242, which may be a through notch or an arc-shaped notch. The first sub-groove 2142 and the corresponding first notch 2242 form a receiving space, so that the battery 50 to be tested is limited in the receiving space, thereby limiting the movement of the battery 50 to be tested in the radial direction.

[0094] In one embodiment, Figure 3 As shown, the first fixed block 214 adjacent to the support block 120 is provided with a first protrusion 2144, and the first protrusion 2144 is used to limit the battery 50 to be tested arranged in the accommodating groove 200 based on the second direction; and / or, the first fixed block 214 away from the support block 120 is provided with a second protrusion 2244, and the second protrusion 2244 is used to limit the battery 50 to be tested arranged in the accommodating groove 200 based on the second direction.

[0095] For example, the first fixing block 214 adjacent to the support block 120 may be the first fixing block 214 closest to the bottom surface of the battery 50 to be tested when the battery 50 to be tested is disposed in the accommodating groove 200; the first fixing block 214 away from the support block 120 refers to the first fixing block 214 closest to the top surface of the battery 50 to be tested when the battery 50 to be tested is disposed in the accommodating groove 200.

[0096] The second direction may be the axial direction of the battery 50 to be tested, and the first protrusion 2144 may be a hollow annular protrusion used to limit the axial movement of the battery 50 to be tested. The second protrusion 2244 may be a hollow annular protrusion used to limit the axial movement of the battery 50 to be tested.

[0097] Exemplarily, the radius of the first protrusion 2144 can be between the radius of the explosion-proof valve notch of the battery 50 to be tested and the battery radius, the radius of the second protrusion 2244 can be between the radius of the explosion-proof valve notch of the battery 50 to be tested and the battery radius, the explosion-proof valve is arranged on the bottom surface of the battery 50 to be tested, and the radius range of the explosion-proof valve is 10 mm to 18 mm.

[0098] In one embodiment, Figure 1 As shown, the first fixed block 214 away from the support block 120 is provided with a long through hole 2146, and the support plate group 110 is provided with an installation through hole 130; the first fixed block 214 is fixed to the support plate group 110 by a first fastener passing through the long through hole 2146 and the installation through hole 130; the long through hole 2146 is used to adjust the relative position of the first fixed block 214 and the support plate group 110.

[0099] The long through hole 2146 may be in the shape of a circular track or a rounded rectangle, and the first fastener may be a bolt. By providing the long through hole 2146 on the corresponding first fixing block 214, the relative position of the corresponding first fixing block 214 and the support plate group 110 can be adjusted, so that the fixing module can adapt to the batteries 50 to be tested of different heights, thereby improving the versatility of the battery compression test.

[0100] In one embodiment, Figure 4 As shown, the arc angle of the receiving groove 200 is greater than 180°.

[0101] After the first fixing block 214 is fixedly connected with the corresponding second fixing block 224, a receiving groove 200 for placing the battery 50 to be tested is formed. By setting the arc angle of the receiving groove 200 to be greater than 180°, the battery 50 to be tested can be limited based on a first direction (such as a radial direction), thereby preventing the battery 50 to be tested from falling off during the test, thereby improving the reliability of the extrusion test of the battery 50 to be tested.

[0102] In one embodiment, the moving speed of the extrusion head 30 is 2 mm / s to 20 mm / s.

[0103] The moving speed of the extrusion head 30 can be obtained according to the system preset, for example, the moving speed of the extrusion head 30 can be set to 2 mm / s, 5 mm / s or 20 mm / s, etc. Based on the preset moving speed, the extrusion head 30 is controlled to perform an extrusion test on the battery 50 to be tested at least at two extrusion positions, and the test results obtained can more accurately characterize the extrusion resistance performance of the battery 50 to be tested, thereby reducing the result error of the battery extrusion resistance test.

[0104] In one embodiment, a first insulating layer is disposed on the surface of the fixing component 20 , and a second insulating layer is disposed on the surface of the supporting component 10 .

[0105] The first insulating layer and the second insulating layer may be, but are not limited to, Teflon tape layers. For example, the first insulating layer may be coated on the outer surface of the fixing component 20 by bonding or spraying, thereby achieving insulation of the fixing component 20; the second insulating layer may be coated on the outer surface of the supporting component 10 by bonding or spraying, thereby achieving insulation of the supporting component 10, thereby avoiding short circuit of the battery during the extrusion test of the battery 50 to be tested, thereby improving the reliability and safety of the extrusion test of the battery 50 to be tested.

[0106] In one embodiment, Figure 5 , Figure 7 and Fig. 9 As shown, the battery compression test device further includes a test bench 60 ; the support assembly 10 is disposed on the test bench 60 .

[0107] The test bench 60 can be used to strengthen the support assembly 10 .

[0108] The support assembly 10 can be set on the test bench 60 by screw connection. Figure 5 As shown, the support plate group 110 is provided with corresponding through holes, the test bench 60 is provided with corresponding threaded blind holes, the support plate group 110 is placed on the test bench 60 and fixed by bolts, and the extrusion head 30 is connected to the control module (such as the extrusion test machine propulsion device). The extrusion position on the side of the battery 50 to be tested may include an upper extrusion point 410 on the side, a central extrusion point 420 on the side, and a lower extrusion point 430 on the side. The schematic diagram of the extrusion position on the side of the battery 50 to be tested is shown in FIG. Figure 6 shown.

[0109] In one example, the top surface extrusion diagram of the battery 50 to be tested is as follows: Figure 7 As shown, in order to avoid the extrusion head 30 from contacting the fixing assembly 20 when the top surface of the battery 50 to be tested is squeezed, the number of the first fixing block 214 and the second fixing block 224 can be reduced. For example, the first fixing block 214 and the second fixing block 224 close to the top surface of the battery 50 to be tested do not need to be assembled. In order to ensure the reliability of the connection between the battery 50 to be tested and the fixing assembly 20 during the squeeze test, the corresponding second fixing block 224 can be replaced with a fixing block with a larger contact surface with the battery 50 to be tested. The squeezing position on the top surface of the battery 50 to be tested may include a top surface center squeezing point 440 and a top surface edge squeezing point 450. The schematic diagram of the squeezing position on the top surface of the battery 50 to be tested is shown in FIG. Figure 8 shown.

[0110] In one example, the bottom surface extrusion diagram of the battery 50 to be tested is as follows: Fig. 9 As shown, in order to avoid the extrusion head 30 from contacting the fixing assembly 20 when the bottom surface of the battery 50 to be tested is squeezed, the number of the first fixing block 214 and the second fixing block 224 can be reduced. For example, the first fixing block 214 and the second fixing block 224 close to the bottom surface of the battery 50 to be tested do not need to be assembled. In order to ensure the reliability of the connection between the battery 50 to be tested and the fixing assembly 20 during the squeeze test, the corresponding second fixing block 224 can be replaced with a fixing block with a larger contact surface with the battery 50 to be tested. The squeezing position of the bottom surface of the battery 50 to be tested may include a bottom surface center squeezing point 460 and a bottom surface edge squeezing point 470. The schematic diagram of the squeezing position of the bottom surface of the battery 50 to be tested is shown in FIG. Fig.10 shown.

[0111] In one embodiment, Fig.11 As shown, the specific process of the battery squeeze test is as follows:

[0112] S1. Adjust the SOH and SOC status of the battery to be tested to the test required status, and record the basic information of the battery to be tested, such as number, appearance, weight, SOC, OCV and SOH.

[0113] S2. Select five batteries to be tested in the same state as the first test batch samples, fix the corresponding batteries to be tested on the fixing assembly through the battery extrusion test device in the above embodiment, and install the extrusion head to the control module.

[0114] S3. Turn on the battery squeeze test device and squeeze the corresponding battery to be tested to a preset intrusion amount.

[0115] S4. The squeezed battery to be tested is left to stand for a period of time, and whether the battery to be tested passes the test is determined according to preset judgment conditions.

[0116] S5. If all five batteries to be tested in the first test batch are judged to have passed the test, the preset intrusion amount is increased by 1 mm, and then five batteries to be tested in the second test batch are selected and returned to step S2 to re-perform the extrusion test according to the increased preset intrusion amount, until one battery to be tested among the five batteries to be tested in the Nth test batch (N is a positive integer) is judged to have failed the test, then the adjusted preset intrusion amount of the N-1th test batch is set as the maximum intrusion amount of the battery to be tested under the corresponding state (such as the corresponding state can be the corresponding judgment condition, SOH, SOC, shape and size of the extrusion head, and extrusion position).

[0117] S6. If one of the five batteries to be tested in the first test batch is judged to have failed the test, the preset intrusion amount is reduced by 1 mm, and five batteries to be tested in the second test batch are selected and returned to step S2 to re-perform the extrusion test according to the reduced preset intrusion amount, until all five batteries to be tested in the Nth test batch are judged to have passed the test, then the adjusted preset intrusion amount of the Nth test batch is set as the maximum intrusion amount of the battery to be tested under the corresponding state (such as the corresponding state can be the corresponding judgment condition, SOH, SOC, shape and size of the extrusion head, and extrusion position).

[0118] S7. Generate an evaluation table of the compression intrusion resistance of the battery to be tested according to the compression test results of the battery to be tested.

[0119] In the above embodiment, the maximum intrusion amount of the battery to be tested at different positions on the top, bottom and side surfaces of the battery to be tested under different health states, different charges and different judgment conditions can be evaluated. The test results obtained by the test can more accurately characterize the compression resistance performance of the battery to be tested under different conditions, reduce the result error of the battery compression resistance test, and improve the reliability of the battery compression resistance test.

[0120] In one embodiment, Fig.12 As shown, a battery squeeze test method is also provided, which is applied to any of the battery squeeze test devices as described above, and the battery squeeze test method comprises the following steps:

[0121] Step S110, based on a preset intrusion amount, controlling the extrusion head to move along at least two extrusion directions, so that the extrusion head extrudes at least two extrusion positions of the battery to be tested; each extrusion direction corresponds to each extrusion position.

[0122] The preset intrusion amount is the initial intrusion amount of the extrusion test. For example, the preset intrusion amount can be set between 3 mm and 5 mm. The extrusion position of the battery to be tested can be the center of the bottom surface of the battery, the center of the top surface of the battery, and / or the center of the side surface of the battery.

[0123] For example, the control module can control the extrusion head to move along the first direction based on the preset intrusion amount and the preset intrusion speed, so that the extrusion head squeezes the center of the bottom surface of the battery to be tested, thereby realizing an extrusion test on the center of the bottom surface of the battery; similarly, the control module can control the extrusion head to move along the second direction based on the preset intrusion amount and the preset intrusion speed, so that the extrusion head squeezes the center of the top surface of the battery to be tested, thereby realizing an extrusion test on the center of the top surface of the battery; the control module can control the extrusion head to move along the third direction based on the preset intrusion amount and the preset intrusion speed, so that the extrusion head squeezes the center of the side surface of the battery to be tested, thereby realizing an extrusion test on the center of the side surface of the battery.

[0124] Step S120, obtaining the current first test data of the battery to be tested after squeezing, and obtaining the squeezing result of the battery to be tested according to the current first test data.

[0125] For example, after squeezing the center of the bottom surface of the battery to be tested, the corresponding current first test data is obtained; after squeezing the center of the top surface of the battery to be tested, the corresponding current first test data is obtained; after squeezing the center of the side surface of the battery to be tested, the corresponding current first test data is obtained, and the test data of the battery to be tested at different positions is obtained, and then the current first test data can be compared with the preset judgment conditions to obtain the squeezing result of the battery to be tested, so as to more accurately characterize the squeezing resistance of the battery under different pressure states, and provide a reliable basis for improving the safety performance of the battery to be tested and designing the mechanical protection device of the battery system.

[0126] In the above-mentioned embodiment, by performing an extrusion test on the battery to be tested at at least two extrusion positions, the test results obtained can more accurately characterize the extrusion resistance performance of the battery to be tested, reduce the result error of the battery extrusion resistance test, and improve the test reliability.

[0127] In one embodiment, Fig.13 As shown, the battery compression test method also includes the steps of:

[0128] Step S210, obtaining the current second test data of the current test batch samples; the current second test data is obtained by testing the current test batch samples after squeezing based on a preset intrusion amount; the current test batch samples include at least 2 batteries to be tested from the same batch.

[0129] The current test batch samples refer to at least two batteries to be tested from the same batch and with the same battery status. For example, if the current test batch samples include five batteries to be tested from the same batch, the five batteries to be tested from the same batch have the same model, SOC, OVC, and SOH. The current second test data refers to the test data obtained by squeezing each battery to be tested in the current test batch samples based on a preset intrusion amount.

[0130] Step S220, comparing the current second test data with the preset determination condition, and adjusting the preset intrusion amount according to the comparison result.

[0131] For example, the preset determination conditions may include any group or any combination of the following: whether the battery is leaking, whether the battery is on fire, and whether the battery is exploding. Correspondingly, the current second test data may include any group or any combination of the following: leakage data, fire data, and explosion data. Among them, whether the battery is on fire can be determined by direct observation; the fire data can also be temperature data, that is, whether the battery is on fire can be determined by whether the temperature data reaches a preset temperature threshold. Whether the battery explodes can be determined by direct observation; the explosion data can be sound decibel data, that is, whether the battery explodes can be determined by whether the sound decibel data reaches a preset decibel threshold.

[0132] A method for detecting whether a battery to be tested is leaking may be a helium test, that is, placing the squeezed battery to be tested in a vacuum chamber, injecting helium, and filling the battery to be tested with helium, so that a difference in helium concentration occurs inside and outside the battery to be tested, and then using a concentration detector to detect changes in helium concentration. The concentration detector measures whether the helium concentration changes, thereby indicating whether there is helium leakage from the battery to be tested, thereby determining the leakage of the battery to be tested.

[0133] By comparing the acquired current second test data with the preset judgment condition, and adjusting the preset intrusion amount according to the comparison result, and squeezing each battery to be tested in another test batch sample according to the adjusted preset intrusion amount, and acquiring the current second test data corresponding to the adjusted preset intrusion amount, and comparing the corresponding current second test data with the preset judgment condition, and adjusting the preset intrusion amount again according to the comparison result, until the corresponding current second test data meets the test termination condition.

[0134] Step S230, determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount.

[0135] According to the corresponding adjusted preset intrusion amount, the adjusted preset intrusion amount that can meet the test termination condition is selected and determined as the maximum intrusion amount of the battery to be tested, thereby realizing accurate testing of the maximum extrusion resistance intrusion amount of the battery to be tested, which can more accurately characterize the extrusion resistance performance of the battery to be tested and improve the test reliability.

[0136] In one embodiment, Fig.14 As shown, the battery compression test method also includes the steps of:

[0137] Step S310, obtaining the current second test data of the current test batch samples; the current second test data is obtained by testing the current test batch samples after squeezing based on a preset intrusion amount; the current test batch samples include at least 2 batteries to be tested from the same batch.

[0138] For the specific description of the above step S310, please refer to the description of the above embodiment, which will not be repeated here.

[0139] Step S320, when the current second test data meets the preset judgment condition, the preset intrusion amount is increased by the first step value, and the next second test data of the next test batch sample is obtained, until the next second test data does not meet the preset judgment condition.

[0140] The first step value may be obtained according to a system preset, for example, the first step value may be set to 0.5 mm, 1 mm or 2 mm.

[0141] For example, the current second test data of each battery to be tested in the current test batch sample is compared with the preset judgment condition. If the current second test data of each battery to be tested meets the preset judgment condition, the preset intrusion amount is increased by the first step value. Then, each battery to be tested in the next test batch sample is selected to perform an extrusion test based on the updated preset intrusion amount, and the corresponding next second test data is obtained. The next second test data of each battery to be tested in the next test batch sample is compared with the preset judgment condition. If the current second test data of each battery to be tested meets the preset judgment condition, the updated preset intrusion amount is increased by the first step value again. This process is repeated until the next second test data of at least one battery to be tested in the next test batch sample does not meet the preset judgment condition, and the extrusion test is terminated.

[0142] Step S330: when the next second test data does not meet the preset determination condition, the preset intrusion amount corresponding to the previous second test data is determined as the maximum intrusion amount.

[0143] The next second test data of each battery to be tested in the next test batch sample is compared with the preset judgment condition. If the next second test data of at least one battery to be tested does not meet the preset judgment condition, the test batch sample is judged to have failed the test, and then the preset intrusion amount corresponding to the previous second test data is determined as the maximum intrusion amount of the corresponding battery to be tested under the corresponding state, thereby realizing accurate testing of the maximum intrusion amount of the compression resistance of the battery to be tested, which can more accurately characterize the compression resistance performance of the battery to be tested and improve the test reliability.

[0144] In one embodiment, Fig.15 As shown, the battery compression test method also includes the steps of:

[0145] Step S410, obtaining the current second test data of the current test batch samples; the current second test data is obtained by testing the current test batch samples after squeezing based on a preset intrusion amount; the current test batch samples include at least 2 batteries to be tested from the same batch.

[0146] For the specific description of the above step S410, please refer to the description of the above embodiment, which will not be repeated here.

[0147] Step S420, when the current second test data does not meet the preset judgment condition, the preset intrusion amount is reduced by the first step value, and the next second test data of the next test batch sample is obtained until the next second test data meets the preset judgment condition.

[0148] The first step value may be obtained according to a system preset, for example, the first step value may be set to 0.5 mm, 1 mm or 2 mm.

[0149] For example, the current second test data of each battery to be tested in the current test batch sample is compared with the preset judgment condition. If the current second test data of at least one battery to be tested does not meet the preset judgment condition, the preset intrusion amount is reduced by the first step value. Then, each battery to be tested in the next test batch sample is selected to perform an extrusion test based on the updated preset intrusion amount, and the corresponding next second test data is obtained. The next second test data of each battery to be tested in the next test batch sample is compared with the preset judgment condition. If the current second test data of at least one battery to be tested does not meet the preset judgment condition, the updated preset intrusion amount is reduced by the first step value again. And so on, until the next second test data of each battery to be tested in the next test batch sample meets the preset judgment condition, the extrusion test is terminated.

[0150] Step S430: when the next second test data meets the preset determination condition, the preset intrusion amount corresponding to the next second test data is determined as the maximum intrusion amount.

[0151] The next second test data of each battery to be tested in the next test batch samples are compared with the preset judgment conditions. If the next second test data of each battery to be tested in the corresponding batch all meet the preset judgment conditions, the test batch samples are judged to have passed the test, and then the preset intrusion amount of the next second test data of the corresponding batch is determined as the maximum intrusion amount of the corresponding battery to be tested under the corresponding state, thereby realizing accurate testing of the maximum intrusion amount of the extrusion resistance of the battery to be tested, which can more accurately characterize the extrusion resistance performance of the battery to be tested and improve the test reliability.

[0152] In one embodiment, based on a preset intrusion amount, the step of controlling the extrusion head to move along at least two extrusion directions so that the extrusion head extrudes at least two extrusion positions of the battery to be tested comprises:

[0153] Adjust the current state of the battery to be tested to the preset test state.

[0154] Among them, the current state of the battery to be tested includes the SOH (State of Health), SOC (State Of Charge) and OCV (Open Circuit Voltage) of the battery to be tested. The current state of the battery to be tested also includes information such as battery number, appearance and weight. Exemplarily, the range of SOH can be 70% to 100% SOH, and the range of SOC can be 0 to 100% SOC.

[0155] By evaluating the maximum extrusion intrusion of the battery at different positions on the top, bottom and side surfaces under different health states, different charges and different preset judgment conditions (such as no leakage, no fire and no explosion), the obtained test results can more accurately characterize the extrusion resistance performance of the battery under different conditions, provide a basis for improving battery safety performance and the design of mechanical protection devices for battery systems, reduce the error of battery extrusion resistance test results and improve test reliability.

[0156] In one example, the step of obtaining the current first test data of the battery to be tested after squeezing includes:

[0157] The squeezed battery to be tested is left to stand for a preset time.

[0158] Among them, the preset static time can be set between 1 and 6 hours.

[0159] For example, each battery to be tested in the current test batch samples is selected for an extrusion test based on a preset intrusion amount. After each battery to be tested after the extrusion test is left to stand for a preset time, the current second test data of each battery to be tested in the current test batch samples is obtained, thereby improving the accuracy of the current second test data, thereby improving the accuracy of calculating the maximum extrusion intrusion amount of the battery to be tested.

[0160] Similarly, each battery to be tested in the next test batch samples is selected for extrusion testing based on the updated preset intrusion amount. After each battery to be tested after the extrusion test is left to stand for a preset time, the next second test data of each battery to be tested in the next test batch samples is obtained, thereby improving the accuracy of the next second test data, thereby improving the accuracy of calculating the maximum extrusion intrusion amount of the battery to be tested.

[0161] In one embodiment, the step of determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount includes:

[0162] According to the maximum intrusion amount, the preset judgment conditions and the current second test data, an extrusion intrusion performance evaluation table is obtained.

[0163] For example, a mapping relationship table can be established based on the maximum intrusion amount, the preset judgment condition and the current second test data, and then a corresponding extrusion intrusion performance evaluation table can be obtained. Exemplarily, the extrusion intrusion performance evaluation table may also include: whether the preset judgment condition is met, SOC data, SOH data, extrusion head shape and size, extrusion position and extrusion intrusion resistance (i.e., maximum intrusion amount) and other information columns. By establishing an extrusion intrusion performance evaluation table, it is convenient for users to check the extrusion data of the corresponding battery to be tested, and it is also convenient to retrieve the corresponding extrusion data for comparison processing to improve the efficiency of data processing.

[0164] It should be understood that although Figures 12 to 15 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figures 12 to 15 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0165] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any one of the above-mentioned battery squeeze test methods are implemented.

[0166] For example, a computer program, when executed by a processor, performs the following steps:

[0167] Based on the preset intrusion amount, the extrusion head is controlled to move along at least two extrusion directions so that the extrusion head can extrude at least two extrusion positions of the battery to be tested; each extrusion direction corresponds to each extrusion position one by one; the current first test data of the battery to be tested after extrusion is obtained, and the extrusion result of the battery to be tested is obtained according to the current first test data.

[0168] In another example, the computer program, when executed by a processor, implements the following steps:

[0169] Obtain the current second test data of the current test batch samples; the current second test data is obtained by testing the current test batch samples after extrusion based on a preset intrusion amount; the current test batch samples include at least 2 batteries to be tested from the same batch; compare the current second test data with the preset judgment conditions, and adjust the preset intrusion amount based on the comparison result; determine the maximum intrusion amount of the battery to be tested based on the corresponding adjusted preset intrusion amount.

[0170] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned division operation methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0171] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0172] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery compression test device, characterized in that: include: Support components; A fixing assembly, the fixing assembly being arranged on the supporting assembly and being used to fix the battery to be tested; An extrusion head, the extrusion head is used to squeeze at least two extrusion positions of the battery to be tested; A control module is connected to the extrusion head, and is configured to control the extrusion head to move along at least two extrusion directions; each of the extrusion directions corresponds to each of the extrusion positions.

2. The battery extrusion test device according to claim 1, characterized in that: The fixing assembly is provided with a receiving groove, and the receiving groove is used to receive the battery to be tested.

3. The battery extrusion testing device according to claim 2, characterized in that: The support assembly includes a support plate group and a support block; The support block is arranged on the support plate group, and the support block is provided with an avoidance groove; the avoidance groove is connected to the accommodating groove, and the avoidance groove is used to avoid the explosion-proof valve of the battery to be tested when the explosion-proof valve of the battery to be tested is arranged adjacent to the support block.

4. The battery extrusion testing device according to claim 3, characterized in that: The support plate group includes a first support plate and a second support plate; The first support plate and the second support plate are arranged based on a preset angle, and the support block is fixed on the first support plate and / or the second support plate.

5. The battery extrusion testing device according to claim 3, characterized in that: The fixing assembly comprises a first fixing module and a second fixing module; the first fixing module is provided with a first groove; the second fixing module is provided with a limited notch; The first fixing module is arranged on the supporting plate group, the second fixing module is arranged on the first fixing module, and the limiting notch and the first groove are enclosed to form the accommodating groove; The second fixing module is used to limit the battery to be tested disposed in the accommodating groove based on a first direction.

6. The battery extrusion testing device according to claim 5, characterized in that: The first fixing module includes a plurality of first fixing blocks, and the second fixing module includes a plurality of second fixing blocks; each of the first fixing blocks is arranged in one-to-one correspondence with each of the second fixing blocks; The first fixing block is provided with first sub-grooves, and the first sub-grooves are enclosed to form the first groove; The second fixing block is provided with first notches, and the first notches are enclosed to form the limiting notch.

7. The battery extrusion testing device according to claim 6, characterized in that: A first protrusion is disposed on the first fixing block adjacent to the supporting block, and the first protrusion is used to limit the battery to be tested disposed in the accommodating groove based on a second direction; And / or, the first fixing block away from the supporting block is provided with a second protrusion, and the second protrusion is used to limit the battery to be tested arranged in the accommodating groove based on a second direction.

8. The battery extrusion testing device according to claim 6, characterized in that: The first fixing block away from the supporting block is provided with a long through hole, and the supporting plate group is provided with a mounting through hole; The first fixing block is fixed to the support plate group through the first fastener passing through the elongated through hole and the mounting through hole; the elongated through hole is used to adjust the relative position of the first fixing block and the support plate group.

9. The battery extrusion testing device according to claim 3, characterized in that: The arc angle of the accommodating groove is greater than 180°.

10. The battery extrusion testing device according to any one of claims 1 to 9, characterized in that: The moving speed of the extrusion head is 2 mm / s to 20 mm / s.

11. The battery extrusion testing device according to any one of claims 1 to 9, characterized in that: A first insulating layer is disposed on the surface of the fixing component, and a second insulating layer is disposed on the surface of the supporting component.

12. The battery extrusion testing device according to any one of claims 1 to 9, characterized in that: A test bench is also included; the support assembly is arranged on the test bench.

13. A battery compression test method, characterized in that: Applied to the battery squeeze test device according to any one of claims 1 to 12, the method comprises the following steps: Based on the preset intrusion amount, the extrusion head is controlled to move along at least two extrusion directions, so that the extrusion head extrudes at least two extrusion positions of the battery to be tested; each of the extrusion directions corresponds to each of the extrusion positions one by one; The current first test data of the battery to be tested after squeezing is acquired, and the squeezing result of the battery to be tested is obtained according to the current first test data.

14. The battery squeeze test method according to claim 13, characterized in that: Also includes the steps: Acquire current second test data of samples of the current test batch; the current second test data is obtained by testing the samples of the current test batch after extrusion based on a preset intrusion amount; The current test batch samples include at least 2 batteries to be tested from the same batch; comparing the current second test data with a preset determination condition, and adjusting the preset intrusion amount according to a result of the comparison; The maximum intrusion amount of the battery to be tested is determined according to the preset intrusion amount after corresponding adjustment.

15. The battery squeeze test method according to claim 14, characterized in that: The step of comparing the current second test data with the preset determination condition and adjusting the preset intrusion amount according to the comparison result comprises: When the current second test data meets the preset judgment condition, the preset intrusion amount is increased by a first step value, and the next second test data of the next test batch of samples is obtained, until the next second test data does not meet the preset judgment condition; The step of determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount comprises: When the next second test data does not satisfy the preset determination condition, the preset intrusion amount corresponding to the previous second test data is determined as the maximum intrusion amount.

16. The battery squeeze test method according to claim 14, characterized in that: The step of comparing the current second test data with the preset determination condition and adjusting the preset intrusion amount according to the comparison result further includes: When the current second test data does not meet the preset judgment condition, the preset intrusion amount is reduced by a first step value, and the next second test data of the next test batch of samples is obtained, until the next second test data meets the preset judgment condition; The step of determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount comprises: When the next second test data satisfies the preset determination condition, a preset intrusion amount corresponding to the next second test data is determined as the maximum intrusion amount.

17. The battery squeeze test method according to claim 13, characterized in that: The step of controlling the extrusion head to move along at least two extrusion directions based on the preset intrusion amount so that the extrusion head extrudes at least two extrusion positions of the battery to be tested comprises: Adjusting the current state of the battery to be tested to a preset test state; The step of obtaining the current first test data of the battery to be tested after squeezing includes: The squeezed battery to be tested is left to stand for a preset time.

18. The battery squeeze test method according to claim 14, characterized in that: The current second test data includes any one group or any combination of the following: leakage data, fire data and explosion data.

19. The battery squeeze test method according to any one of claims 13 to 18, characterized in that: After the step of determining the maximum intrusion amount of the battery to be tested according to the corresponding adjusted preset intrusion amount, the following steps are included: An extrusion intrusion performance evaluation table is obtained according to the maximum intrusion amount, the preset judgment condition and the current second test data.

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