Impact testing device and single battery

Abstract

The utility model discloses an impact testing device and a single battery, and belongs to the technical field of battery testing. The impact test device comprises a base module and a rack module, wherein the base module is used for mounting a battery monomer; the rack module comprises a rack, an impact assembly and a limiting piece, and the base module is connected to the rack in a drawing mode; the impact assembly is arranged in the rack and located above the base module, and the impact assembly can slide downwards in the rack in the Z-axis direction to impact the single batteries; the limiting pieces are telescopically connected to the two opposite sides in the rack, each limiting piece has an extending position and a retracting position, and when the impact assembly slides downwards in the Z-axis direction to impact the single batteries, the limiting pieces are located at the retracting positions; when the impact assembly downwards impacts the single batteries along the Z-axis and then rebounds upwards along the Z-axis, the limiting piece is located at the extending position, so that the limiting piece is used for limiting and supporting the impact assembly rebounded upwards along the Z-axis. The impact test device can ensure the accuracy of the impact test result of the single battery, and is simple in structure and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to an impact testing device and a battery monomer. Background Art

[0002] Currently, when using an impact testing device to perform impact tests on battery cells, the impact energy of the ball on the battery cell is determined by the impact depth of the ball head in the impact testing device on the battery cell, or the impact energy of the ball on the battery cell is obtained by photographing working parameters such as the impact rate of the ball head during the impact process with a high-speed camera. On the one hand, the structure of the impact testing device is relatively complex and the cost is relatively high. On the other hand, the secondary impact problem of the ball head on the battery cell cannot be suppressed, and it is difficult to ensure the accuracy of the impact test results on the battery cell.

[0003] In view of the above problems, an impact testing device and a battery cell are urgently needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide an impact testing device and a battery cell, which can ensure the accuracy of the impact test results on the battery cell, and the entire impact testing device has a simple structure and low cost.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] An impact testing device includes a base module and a stand module. The base module is used to mount a battery cell. The stand module includes:

[0007] a stand, the base module being connected to the stand in a pull-out manner;

[0008] an impact assembly, disposed in the stand and above the base module, the impact assembly being capable of sliding downward along the Z-axis in the stand to impact the battery cell;

[0009] A limit member is retractably connected to opposite sides of the stand, and the limit member has an extended position and a retracted position. When the impact assembly slides downward along the Z axis to impact the battery cell, the limit member is located in the retracted position; when the impact assembly impacts the battery cell downward along the Z axis and then rebounds upward along the Z axis, the limit member is located in the extended position, so that the limit member is used to limit and support the impact assembly that rebounds upward along the Z axis.

[0010] As an option, the stand includes:

[0011] A base, wherein the base module is connected in a pull-out manner;

[0012] A hollow cylindrical member is connected to the base and communicated with the base, and the impact assembly and the limiting member are respectively arranged in the hollow cylindrical member.

[0013] As an optional solution, the inner wall surface of the hollow cylindrical member is provided with two opposing guide grooves, and the guide grooves extend along the Z axis; the impact assembly includes:

[0014] a counterweight, wherein opposite ends of the counterweight are respectively slidably disposed in the two guide grooves along the Z axis, and before impacting the battery cell, the counterweight is suspended above the battery cell by magnetic attraction or hooking;

[0015] An impact head is connected to a side of the counterweight member facing the base module, and is used for impacting the battery cell.

[0016] As an optional solution, there is a gap between the end of the counterweight and the guide groove.

[0017] As an optional solution, the impact assembly further includes:

[0018] an optical sensor, disposed on the inner wall surface of the guide groove;

[0019] A light-emitting element is mounted on the counterweight, and the light-emitting element is arranged corresponding to the optical sensor. The optical sensor is used to receive the light signal emitted by the light-emitting element, and the optical sensor can convert the received light signal and transmit it to the limit member, so that when the optical sensor receives two consecutive light signals from the light-emitting element, the limit member is extended to the extended position.

[0020] As an optional solution, a limiting groove is provided in the guide groove, and the limiting member includes:

[0021] The limit baffle is inclined and telescopically connected to the limit slot. When the limit member is in the retracted position, the outer end of the limit baffle is retracted into the limit slot; when the limit member is in the extended position, the outer end of the limit baffle can extend out of the limit slot so that the counterweight rebounds upward along the Z axis and falls onto the limit baffle.

[0022] As an optional solution, the base module includes:

[0023] a base having a cavity formed therein;

[0024] A mounting plate is disposed in the cavity, and the battery cell is placed on the mounting plate;

[0025] At least two pressing members are pressed on the battery cells and connected to the mounting plate.

[0026] As an optional solution, the base module further includes:

[0027] A lifting member is connected between the base and the mounting plate, and is used to drive the mounting plate to move upward along the Z axis relative to the base, so that the mounting plate moves into the hollow cylindrical member.

[0028] As an optional solution, M first mounting holes are provided on the mounting plate, and N second mounting holes are provided on the pressing member, where M is an integer greater than N, and the aligned first mounting holes and the second mounting holes are fixed by fastening bolts.

[0029] A battery cell is subjected to an impact test using the impact testing device described above.

[0030] The beneficial effects of the utility model are:

[0031] The test bench module includes a test bench, an impact assembly and a limiter, so that the base module is connected to the test bench in a pull-out manner, and the impact assembly slides downward along the Z axis in the test bench to impact the battery cell arranged on the base module, so as to perform an impact test on the battery cell; and when the impact assembly slides downward along the Z axis to impact the battery cell, the limiter is located in a retracted position to ensure that the limiter does not interfere with the impact operation of the impact assembly; when the impact assembly impacts the battery cell downward along the Z axis and then rebounds upward along the Z axis, at this time, the limiter is located in an extended position to allow the two relatively large batteries in the test bench to be impacted. The side limiter supports the impact assembly that rebounds upward along the Z axis, that is, the impact assembly that rebounds upward along the Z axis can automatically fall onto the limiter along the Z axis downward to avoid the impact assembly that rebounds upward along the Z axis from impacting the battery cell downward along the Z axis again, which can better suppress the secondary impact problem of the impact assembly on the battery cell, thereby ensuring that the impact test results on the battery cell are more accurate; and, the above-mentioned avoidance of the secondary impact problem of the impact assembly by the blocking and supporting effect of the limiter can make the structure of the entire impact testing device simple and the cost low. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the impact test device provided by the utility model (the limit baffle is in the retracted position) Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the structure of the impact test device provided by the utility model (the limit baffle is in the extended position) Figure 2 ;

[0034] Figure 3yes Figure 2 Schematic diagram of the local enlarged structure at A in the middle;

[0035] Figure 4 This is a cross-sectional view of the impact testing device provided by the present invention (with the limit baffle in the extended position);

[0036] Figure 5 This is a schematic diagram of the structure of the impact head provided by the utility model when it contacts and impacts a battery cell;

[0037] Figure 6 It is a structural diagram of the base module provided by the utility model.

[0038] Description of reference numerals:

[0039] 10-battery cell;

[0040] 1-base module; 11-base; 111-cavity; 12-mounting plate; 121-first mounting hole; 13-pressing member; 131-second mounting hole; 14-fastening bolt; 15-lifting member;

[0041] 2-bench module; 21-bench; 211-base; 212-hollow cylindrical member; 2121-guide groove; 2122-inner wall; 22-impact assembly; 221-counterweight; 222-impact head; 223-mounting column; 224-connecting stud; 225-light-emitting element; 231-limit baffle. DETAILED DESCRIPTION

[0042] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0043] Any feature disclosed in this specification, unless otherwise stated, may be replaced by an equivalent or similar alternative feature. That is, unless otherwise stated, each feature is merely an example of a set of equivalent or similar features. Throughout this specification, like reference numerals refer to like elements.

[0044] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0045] Currently, impact testing of battery cells is performed using an impact testing device to obtain the safety risk of the impact degree on the battery cells, thereby ensuring the safe operating parameters of the battery cells. However, due to the complex structure and high cost of the current impact testing device, and the inability to suppress the secondary impact of the ball head on the battery cells, it is difficult to ensure the accuracy of the impact test results on the battery cells.

[0046] To this end, this embodiment proposes an impact testing device and a battery cell. The battery cell is impact tested using the impact testing device to obtain safe operating parameters of the battery cell. Furthermore, the impact testing device has a simple structure, is relatively low cost, and effectively suppresses secondary impacts on the battery cell, thereby ensuring high accuracy of the impact test results on the battery cell. The battery cell in this embodiment may specifically be a lithium-ion battery cell, which is not specifically limited herein.

[0047] Specifically, if Figures 1 to 6 As shown, the impact testing device includes a base module 1 and a stand module 2, and the base module 1 is used to install a battery cell 10; the stand module 2 includes a stand 21, an impact assembly 22 and a limiter; wherein, the base module 1 is connected to the stand 21 in a pull-out manner; the impact assembly 22 is arranged in the stand 21 and is located above the base module 1, and the impact assembly 22 can slide downward along the Z axis in the stand 21 to impact the battery cell 10; the limiter is telescopically connected to the opposite sides of the stand 21, and the limiter has an extended position and a retracted position. When the impact assembly 22 slides downward along the Z axis to impact the battery cell 10, the limiter is located in the retracted position; when the impact assembly 22 impacts the battery cell 10 downward along the Z axis and then rebounds upward along the Z axis, the limiter is located in the extended position, so that the limiter is used to limit and support the impact assembly 22 that rebounds upward along the Z axis.

[0048] Compared with the prior art, the impact testing device in this embodiment has changed the specific setting structure of the impact testing device; by making the stand module 2 include a stand 21, an impact assembly 22 and a limiter, the base module 1 is connected to the stand 21 in a pull-out manner, and the impact assembly 22 is slid downward along the Z axis in the stand 21 to impact the battery cell 10 set on the base module 1, so as to perform an impact test on the battery cell 10; and when the impact assembly 22 slides downward along the Z axis to impact the battery cell 10, the limiter is located in the retracted position to ensure that the limiter does not interfere with the impact operation of the impact assembly 22; when the impact assembly 22 impacts the battery cell 10 downward along the Z axis, it rebounds upward along the Z axis. At this time, the limiter is located in the extended position, so that the limiters on the opposite sides of the stand 21 can support the impact assembly 22 that rebounds upward along the Z axis. That is, the impact assembly 22 that rebounds upward along the Z axis can automatically fall onto the limiter along the Z axis downward to avoid the impact assembly 22 that rebounds upward along the Z axis from impacting the battery cell 10 downward along the Z axis again, which can better suppress the secondary impact problem of the impact assembly 22 on the battery cell 10, thereby ensuring that the impact test result on the battery cell 10 is more accurate; and the above-mentioned avoidance of the secondary impact problem of the impact assembly 22 by the blocking and supporting effect of the limiter can make the structure of the entire impact testing device simple and the cost low.

[0049] It is worth noting that if Figure 1 and Figure 2 As shown, by connecting the base module 1 to the stand 21 in a pull-out manner, on the one hand, the relative opening and closing operations between the base module 1 and the stand 21 are simple and convenient, which is conducive to taking and placing the battery cells 10 on the base module 1; on the other hand, an integral connection structure is formed between the base module 1 and the stand 21, ensuring that the connection between the base module 1 and the stand 21 is relatively reliable during the impact test on the battery cells 10, thereby ensuring the stability and reliability of the impact test on the battery cells 10. Among them, the pull-out connection between the base module 1 and the stand 21 can be achieved by using the pull-out structure in the prior art, and the pull-out connection method is not described in detail here.

[0050] The specific structure of the rack module 2 is described in detail below:

[0051] Furthermore, if Figure 1 and Figure 2As shown, the stand 21 includes a base 211 and a hollow cylindrical member 212; wherein the base module 1 is retractably connected to the base 211; the hollow cylindrical member 212 is connected to the base 211 and communicates with the base 211, so that the base 211 and the hollow cylindrical member 212 are connected to form an inverted T-shaped stand 21; and the impact assembly 22 and the limiter are respectively disposed in the hollow cylindrical member 212. In this embodiment, the hollow cylindrical member 212 can be specifically a hollow sleeve, and the base 211 can be specifically a hollow square block structure, and the base 211 and the hollow cylindrical member 212 are integrally formed.

[0052] Specifically, if Figures 1 to 4 As shown, two opposite guide grooves 2121 are provided on the inner wall surface of the hollow cylindrical member 212, and the guide grooves 2121 extend along the Z axis; and the impact assembly 22 includes a counterweight 221 and an impact head 222, and the opposite ends of the counterweight 221 are respectively slidably provided in the two guide grooves 2121 along the Z axis, and before impacting the battery cell 10, the counterweight 221 is suspended above the battery cell 10 by magnetic attraction or hook action; the impact head 222 is connected to the side of the counterweight 221 facing the base module 1, and the impact head 222 is used to directly contact and impact the battery cell 10.

[0053] By making the opposite ends of the counterweight 221 slide along the Z axis in the two guide grooves 2121 respectively, the guide grooves 2121 can provide a guiding and limiting effect for the movement of the counterweight 221 and the impact head 222 on the Z axis, thereby ensuring the guidance and stability of the movement of the counterweight 221 and the impact head 222 on the Z axis, thereby ensuring that the impact head 222 can impact the battery cell 10 more accurately, thereby ensuring that the accuracy of the impact test results on the battery cell 10 is higher.

[0054] In addition, before impacting the battery cell 10, the counterweight 221 is suspended above the battery cell 10 by magnetic attraction or hooking, that is, before impacting the battery cell 10, the limiter is in the retracted position. At this time, the counterweight 221 and the impact head 222 are not supported by a supporting structure, but are suspended above the battery cell 10. Therefore, it is necessary to suspend the counterweight 221 above the battery cell 10 by magnetic attraction or hooking; when the impact head 222 is required to impact the battery cell 10 downward along the Z axis, the magnetic attraction on the counterweight 221 is released or the counterweight 221 is removed from the hook, so that the counterweight 221 and the impact head 222 as a whole can automatically fall downward along the Z axis under the action of their own gravity, so that they can contact and impact the battery cell 10 through the impact head 222.

[0055] It is worth noting that the specific descending height and descending time of the counterweight 221 and the impact head 222 along the Z axis can be adjusted by adjusting the size and specific magnetic position of the magnetic attraction acting on the counterweight 221, or by adjusting the size and specific hooking position of the hook acting on the counterweight 221, thereby obtaining a variety of different impact effects on the battery cell 10.

[0056] In this embodiment, the counterweight 221 can be specifically a counterweight block structure. In other embodiments, the counterweight 221 can also be a counterweight column structure, so that the counterweight column structure can increase the guiding area between the counterweight and the guide groove 2121, thereby ensuring a better guiding effect on the counterweight 221 on the Z axis.

[0057] Furthermore, by providing counterweights 221 of different weights and impact heads 222 of different weights, a variety of different impact effects can be achieved on the battery cell 10. The weights of the counterweights 221 and the impact heads 222 can be determined based on the actual impact requirements on the battery cell 10 and specific operating conditions, and are not specifically limited herein.

[0058] Specifically, if Figure 4 and Figure 5 As shown, a mounting post 223 is fixedly connected to the side of the counterweight 221 facing the base module 1. That is, the mounting post 223 is protruding from the counterweight 221, and the impact head 222 is removably connected to the mounting post 223 via a connecting stud 224, thereby connecting the counterweight 221 and the impact head 222 to form a single integral structure. The specific structure of the impact head 222 is not limited and needs to be determined based on the specific structure of the battery cell 10 and the actual impact requirements. In this embodiment, the counterweight 221 and the mounting post 223 are integrally formed.

[0059] The impact head 222 is detachably connected to the mounting post 223 via the connecting stud 224, so that the impact head 222 can be quickly disassembled and installed, thereby facilitating subsequent maintenance and replacement of the impact head 222, making the maintenance and replacement of the impact head 222 simpler and more convenient.

[0060] Furthermore, there is a gap between the end of the counterweight 221 and the guide groove 2121, that is, there is no direct contact between the end of the counterweight 221 and the guide groove 2121; on the one hand, the guiding effect of the guide groove 2121 on the counterweight 221 can be ensured; on the other hand, direct contact between the end of the counterweight 221 and the guide groove 2121 can be avoided to generate greater friction, so as to better protect the counterweight 221 and the hollow cylindrical member 212; and, since the contact friction between the counterweight 221 and the guide groove 2121 is reduced, the smooth sliding of the counterweight 221 in the guide groove 2121 can be ensured, and then the movement of the impact head 222 on the Z axis can be ensured without any jamming or stagnation, so as to ensure that the impact head 222 has a smoother impact on the battery cell 10.

[0061] It is worth noting that the gap between the end of the counterweight 221 and the guide groove 2121 is small. As long as there is no direct contact between the end of the counterweight 221 and the guide groove 2121, the guide groove 2121 can serve as a limiting guide for the counterweight 221. Here, the specific value of the gap between the end of the counterweight 221 and the guide groove 2121 is not limited.

[0062] Furthermore, if Figures 3 to 5 As shown, the impact assembly 22 also includes an optical sensor and a light-emitting element 225. The optical sensor is located on the inner wall 2122 of the guide groove 2121. The light-emitting element 225 is mounted on the end of the counterweight 221, and the light-emitting element 225 is arranged corresponding to the optical sensor. The optical sensor is used to receive the light signal emitted by the light-emitting element 225. During the falling process, the light-emitting element 225 continuously emits sensitive light, which is irradiated on the optical sensor in the guide groove 2121. The optical sensor receives the light signal in real time and outputs it, thereby obtaining the position of the impact head 222 at different times. The optical sensor is capable of converting the received light signal and transmitting it to the limiter. When the optical sensor receives two consecutive light signals from the light-emitting element 225, the limiter automatically extends to the extended position. The optical sensor is directly bonded to the inner wall 2122 of the guide groove 2121. The light-emitting element 225 can specifically be an infrared probe.

[0063] In this embodiment, Figure 2 and Figure 5As shown, four light-emitting elements 225 are arranged on the counterweight 221, that is, two light-emitting elements 225 are relatively arranged at one end of the counterweight 221, and two light-emitting elements 225 are relatively arranged at the other end of the counterweight 221, and one light-emitting element 225 is arranged corresponding to one optical sensor. The specific setting position of the optical sensor on the inner wall 2122 of the guide groove 2121 needs to be determined according to the impact position on the battery cell 10 and the rebound height of the counterweight 221, and is not specifically limited here.

[0064] Specifically, when the counterweight 221, the light emitting element 225, and the impact head 222 move downward along the Z axis as a whole, at this time, since the optical sensor receives a light signal from the light emitting element 225, the limiter does not move and remains in the initial position, that is, the retracted position, to ensure that the limiter does not interfere with the downward movement of the counterweight 221 along the Z axis; after the impact head 222 impacts the battery cell 10, the instantaneous impact will cause the impact head 222, the counterweight 221 and the light emitting element 225 to rebound upward along the Z axis as a whole, so that in the process of rebounding upward During the process, the optical sensor receives another light signal emitted by the light-emitting element 225 when it moves upward along the Z axis. At this time, since the optical sensor receives two consecutive light signals from the light-emitting element 225, the limit piece can automatically extend to the extended position, so that the counterweight 221 can fall directly onto the limit piece along the Z axis after rebounding upward along the Z axis. At this time, the counterweight 221 is supported by the limit pieces on the opposite sides to avoid the problem that the counterweight 221 and the impact head 222 continue to move downward along the Z axis after rebounding and hit the battery cell 10 for the second time.

[0065] Furthermore, if Figure 3 and Figure 4As shown, a limiting groove is provided in the guide groove 2121; and the limiting member includes a limiting baffle 231, which is inclined and telescopically connected to the limiting groove; when the limiting member is in the retracted position, the outer end of the limiting baffle 231 is retracted into the limiting groove, so that the entire limiting baffle 231 is completely retracted into the limiting groove, so that the counterweight 221 can move downward along the Z axis in the guide groove 2121; when the limiting member is in the extended position, the limiting baffle 231 is retracted into the limiting groove. The outer end of the baffle 231 can extend outward from the limiting groove. At this time, the limiting baffle 231 is tilted in the guide groove 2121 so that the counterweight 221 rebounds upward along the Z axis and then falls onto the limiting baffle 231. That is, at this time, a V-shaped groove can be formed between the limiting baffle 231 and the inner groove surface of the guide groove 2121, and the counterweight 221 automatically falls and is placed on the formed V-shaped groove, thereby achieving limited support for the counterweight 221. Specifically, the limiting member also includes a driving member (not shown in the figure), which is used to drive the limiting baffle 231 to extend or retract relative to the limiting groove, so that the limiting baffle 231 can switch between the extended position and the retracted position; and the driving member is connected to the optical sensor signal so that the driving member can start and stop according to the signal of the optical sensor. Among them, the driving member can be specifically a linear cylinder.

[0066] In other embodiments, the limiting member may further include an elastic member and an opening and closing member, the two ends of the elastic member respectively abutting against the bottom groove wall of the limiting groove and one end of the limiting baffle 231, the opening and closing member is arranged at the notch of the limiting groove, and the opening and closing member can open or close the notch of the limiting groove, and the other end of the limiting baffle 231 is arranged toward the notch of the limiting groove; at the same time, the opening and closing member is connected to the optical sensor signal so that the opening and closing member can open or close the notch of the limiting groove according to the signal of the optical sensor.

[0067] Specifically, when the opening and closing member closes the notch of the limiting groove, the other end of the limiting baffle 231 abuts against the opening and closing member, so that the entire limiting baffle 231 and the elastic member are both limited in the limiting groove, so that the limiting baffle 231 is in the retracted position, and the elastic member is compressed; when the opening and closing member opens the notch of the limiting groove according to the signal of the optical sensor, at this time, since the limiting resistance of the opening and closing member on the limiting baffle 231 is released, the limiting baffle 231 can automatically extend out of the limiting groove under the elastic force of the elastic member, so that the limiting baffle 231 is in the extended position; thereby, the limiting baffle 231 can be switched between the retracted position and the extended position. Here, there is no limitation on other structures included in the limiting member, as long as the extension and retraction of the limiting baffle 231 can be achieved through other structures included in the limiting member.

[0068] It is worth noting that the limit baffles 231 are evenly distributed from top to bottom in each guide groove 2121, that is, two rows of limit baffles 231 are relatively arranged in the hollow cylindrical member 212, so that the two ends of the counterweight 221 can automatically fall and be placed on the two rows of limit baffles 231, thereby ensuring the support stability and reliability of the limit baffles 231 for the counterweight 221.

[0069] Specifically, if Figure 3 and Figure 4 As shown, each column of limit baffles 231 includes a plurality of limit baffles 231, and the plurality of limit baffles 231 are spaced apart along the Z axis so that when the counterweight 221 rebounds upward along the Z axis, after the optical sensor receives two consecutive light signals from the light-emitting element 225, the optical sensor can extend the limit baffle 231 to the extended position, thereby facilitating the end of the counterweight 221 to directly fall onto the limit baffle 231 that matches the rebound height, ensuring that the counterweight 221 can stably fall onto the corresponding limit baffle 231 under different rebound heights, thereby making the impact testing device applicable to a variety of operating conditions with different rebound heights, and having good applicability and versatility. Here, the specific number of limit baffles 231 set in the guide groove 2121 and the spacing between two adjacent limit baffles 231 are not limited, and need to be determined according to the specific impact working conditions and rebound conditions.

[0070] It is worth noting that on the Z axis, the distance between two adjacent limit baffles 231 is large, and the distance between two adjacent limit baffles 231 needs to match the rebound height of the counterweight 221, the extension time of the limit baffle 231 and the specific rebound working conditions, so as to ensure that in the process of each limit baffle 231 extending to the extended position, the limit baffle 231 will not interfere with the upward rebound of the counterweight 221 along the Z axis, thereby ensuring that the counterweight 221 can fall stably on the limit baffles 231 on both sides.

[0071] The specific structure of the base module 1 is described in detail below:

[0072] Furthermore, if Figure 1 、 Figures 4 to 6As shown, the base module 1 includes a base 11, a mounting plate 12, and a pressing member 13; wherein a cavity 111 is formed in the base 11; the mounting plate 12 is horizontally arranged in the cavity 111, and the battery cell 10 is placed on the mounting plate 12; at least two pressing members 13 are pressed on the battery cell 10, and the pressing members 13 are connected to the mounting plate 12, so that the battery cell 10 can be pressed and fixed on the mounting plate 12 by the pressing members 13, ensuring the position stability of the battery cell 10 during the impact process, thereby ensuring that the impact test results of the battery cell 10 are more accurate. In this embodiment, the pressing member 13 can specifically be a pressing block structure, and there are two pressing members 13 pressing on the battery cell 10. Here, there is no limitation on the number of pressing members 13.

[0073] Specifically, if Figure 4 As shown, the base module 1 also includes a lifting member 15, which is connected between the base 11 and the mounting plate 12. The lifting member 15 is used to drive the mounting plate 12 to move upward along the Z axis relative to the base 11, so that the mounting plate 12 moves into the hollow cylindrical member 212, thereby making the battery cell 10 on the mounting plate 12 located in the hollow cylindrical member 212.

[0074] The mounting plate 12 and the battery cell 10 thereon are moved into the hollow cylindrical member 212 by setting a lifting member 15; on the one hand, the hollow cylindrical member 212 can provide a guiding and positioning effect on the battery cell 10, so that the battery cell 10 can be moved to a preset position in the hollow cylindrical member 212, thereby facilitating the impact head 222 to accurately align the battery cell 10 for impact testing, thereby ensuring the accuracy of the impact position of the impact head 222 on the battery cell 10; on the other hand, the hollow cylindrical member 212 can provide a limiting effect on the mounting plate 12 to avoid The problem of tilting and shaking of the mounting plate 12 of the battery cell 10 during the impact process can be avoided, thereby better ensuring the stability of the position of the battery cell 10 during the impact process; and, the safety problem of collision of the battery cell 10 due to the tilting and shaking of the mounting plate 12 can be avoided, thereby ensuring higher safety during the impact process; at the same time, since the battery cell 10 is located in the hollow cylindrical part 212, the material splashed on the battery cell 10 during the impact process can be located in the hollow cylindrical part 212, and will not splash to other positions, thereby better ensuring safety during the impact process.

[0075] Specifically, the lifting member 15 may include a telescopic rod, which drives the mounting plate 12 and battery cell 10 along the Z axis through its extension and retraction. In other embodiments, the lifting member 15 may also include a vertical cylinder and a push rod, with the vertical cylinder used to push the push rod up and down along the Z axis, thereby pushing the mounting plate 12 along the Z axis via the push rod, thereby driving the battery cell 10 along the Z axis. The specific structure of the lifting member 15 is not limited here, as long as the lifting member 15 can push the mounting plate 12 along the Z axis.

[0076] Furthermore, if Figure 5 and Figure 6 As shown, M first mounting holes 121 are provided on the mounting plate 12, and N second mounting holes 131 are provided on the pressing member 13, where M is an integer greater than N. The aligned first mounting holes 121 and the second mounting holes 131 are fixed by fastening bolts 14, so that the pressing member 13 can be fixedly connected to the mounting plate 12, so as to effectively fix the battery cell 10 on the mounting plate 12, and prevent the battery cell 10 from moving on the mounting plate 12 and causing errors in the impact test results.

[0077] By setting a larger number of first mounting holes 121 on the mounting plate 12 and a smaller number of second mounting holes 131 on the pressing member 13, the second mounting holes 131 can be selectively aligned with the first mounting holes 121, so that the pressing member 13 can be fixedly connected to multiple different positions on the mounting plate 12, so that the battery cell 10 can be installed at multiple different positions on the mounting plate 12, thereby being suitable for fixing battery cells 10 of various sizes and shapes, making the entire impact testing device more applicable and versatile.

[0078] In addition, the maximum height h1 of the impact head 222 falling along the Z axis can be obtained through the optical sensor, and the height h2 between the impact head 222 and the upper surface of the battery cell when not impacted can be obtained by directly measuring h1-h2, and the impact energy of the impact head 222 on the battery cell 10 can be obtained, so that the impact energy of the impact head 222 on the battery cell 10 is obtained relatively simply and conveniently, and there is no need to use a high-speed camera to capture it, so that the structure of the entire impact testing device is simpler and the cost is lower.

[0079] The specific working process of the impact testing device in this embodiment is as follows:

[0080] First, place the battery cell 10 at an appropriate position on the mounting plate 12 according to the size and shape of the battery cell 10, then press the two pressing members 13 against the battery cell 10, and fix the aligned first mounting hole 121 and the second mounting hole 131 by tightening the bolts 14 to fix the battery cell 10 between the mounting plate 12 and the pressing members 13.

[0081] Afterwards, the base 11 is pulled out and pushed into the base 211 of the stand 21 to form a connection structure with the base 11 211 ; then the lifting member 15 pushes the mounting plate 12 to move upward along the Z axis so that the mounting plate 12 and the battery cell 10 thereon are both located in the hollow cylindrical member 212 .

[0082] Then, the magnetic attraction or hooking effect on the counterweight 221 is released, so that the counterweight 221, the light-emitting element 225 and the impact head 222 move downward along the Z axis as a whole under the action of their own gravity, so that the impact head 222 contacts and impacts the battery cell 10; at the same time, the end of the counterweight 221 moves downward along the guide groove 2121, and the optical sensor receives a light signal emitted by the light-emitting element 225.

[0083] Then, when the impact head 222 impacts the battery cell 10 and then rebounds upward along the Z axis, the optical sensor receives another light signal from the light-emitting element 225. At this time, since the optical sensor receives two consecutive light signals from the light-emitting element 225, the limit baffle 231 automatically extends to the extended position, so that the counterweight 221 bounces upward along the Z axis and then falls directly downward along the Z axis onto the limit baffle 231 corresponding to the rebound height of the counterweight 221, so as to prevent the counterweight 221 and the impact head 222 from continuing to move downward along the Z axis after rebounding and hitting the battery cell 10 for the second time.

[0084] Finally, the maximum height h1 of the impact head 222 falling along the Z axis is obtained by the optical sensor, and the height h2 between the impact head 222 and the upper surface of the battery cell before impact is directly measured. The impact energy of the impact head 222 on the battery cell 10 is obtained by subtracting h1 from h2.

[0085] The impact testing device in this embodiment has a gap between the end of the counterweight 221 and the guide groove 2121 in the hollow cylindrical member 212, so that there is no direct contact between the end of the counterweight 221 and the guide groove 2121, thereby ensuring the guiding effect of the guide groove 2121 on the counterweight 221 and avoiding direct contact between the end of the counterweight 221 and the guide groove 2121 to generate greater friction.

[0086] By setting up optical sensors, optical elements, and limiters that work in conjunction with each other, the counterweight 221 can be made to fall directly onto the limiter along the Z-axis downward after rebounding along the Z-axis, thereby avoiding the problem that the counterweight 221 and the impact head 222 continue to move downward along the Z-axis after rebounding and collide with the battery cell 10 for the second time.

[0087] In addition, by setting up a lifting member 15 to move the mounting plate 12 and the battery cell 10 thereon into the hollow cylindrical member 212, a guiding and positioning function can be provided for the battery cell 10, and the problem of tilting and shaking of the mounting plate 12 during the impact of the battery cell 10 can be avoided, thereby better ensuring the stability of the position of the battery cell 10 during the impact, and avoiding the safety problem of collision of the battery cell 10 due to tilting and shaking of the mounting plate 12. At the same time, during the impact, the material splashed on the battery cell 10 can be located in the hollow cylindrical member 212, ensuring higher safety.

[0088] Moreover, the maximum height h1 of the impact head 222 falling along the Z axis is obtained through the optical sensor, and the height h2 between the impact head 222 and the upper surface of the battery cell when it is not impacted is obtained. The impact energy of the impact head 222 on the battery cell 10 is obtained by subtracting h1 from h2, making it relatively simple and convenient to obtain the impact energy of the impact head 222 on the battery cell 10.

[0089] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. Impact testing device, characterized in that, The invention comprises a base module (1) and a rack module (2), wherein the base module (1) is used for mounting a battery cell (10); and the rack module (2) comprises: A stand (21), the base module (1) being connected to the stand (21) in a pull-out manner; An impact assembly (22) is provided in the stand (21) and located above the base module (1), and the impact assembly (22) is capable of sliding downward along the Z axis in the stand (21) to impact the battery cell (10); A limiting member is retractably connected to opposite sides of the stand (21), and the limiting member has an extended position and a retracted position. When the impact assembly (22) slides downward along the Z axis to impact the battery cell (10), the limiting member is located at the retracted position; when the impact assembly (22) impacts the battery cell (10) downward along the Z axis and then rebounds upward along the Z axis, the limiting member is located at the extended position, so that the limiting member is used to limit and support the impact assembly (22) rebounding upward along the Z axis.

2. The impact testing device according to claim 1, wherein: The stand (21) comprises: A base (211), wherein the base module (1) is connected in a pull-out manner within the base (211); A hollow cylindrical member (212) is connected to the base (211) and communicates with the base (211); the impact assembly (22) and the limiting member are respectively arranged in the hollow cylindrical member (212).

3. The impact testing device according to claim 2, wherein: The inner wall surface of the hollow cylindrical member (212) is provided with two opposing guide grooves (2121), and the guide grooves (2121) extend along the Z axis; the impact assembly (22) comprises: A counterweight (221), wherein opposite ends of the counterweight (221) are respectively slidably disposed in the two guide grooves (2121) along the Z axis, and before impacting the battery cell (10), the counterweight (221) is suspended above the battery cell (10) by magnetic attraction or hooking action; An impact head (222) is connected to a side of the counterweight (221) facing the base module (1), and the impact head (222) is used to impact the battery cell (10).

4. The impact testing device according to claim 3, wherein: There is a gap between the end of the counterweight (221) and the guide groove (2121).

5. The impact testing device according to claim 3, wherein: The impact assembly (22) further comprises: an optical sensor, disposed on the inner wall surface (2122) of the guide groove (2121); A light emitting element (225) is mounted on the counterweight (221), and the light emitting element (225) is arranged corresponding to the optical sensor, the optical sensor is used to receive the light signal emitted by the light emitting element (225), and the optical sensor can convert the received light signal and transmit it to the limit member, so that when the optical sensor receives two consecutive light signals from the light emitting element (225), the limit member is extended to the extended position.

6. The impact testing device according to claim 3, wherein: A limiting groove is provided in the guide groove (2121), and the limiting member comprises: A limit baffle (231) is tilted and telescopically connected to the limit slot; when the limit member is located at the retracted position, the outer end of the limit baffle (231) is retracted into the limit slot; when the limit member is located at the extended position, the outer end of the limit baffle (231) can extend out of the limit slot, so that the counterweight (221) rebounds upward along the Z axis and then falls onto the limit baffle (231).

7. The impact testing device according to any one of claims 2 to 6, characterized in that: The base module (1) comprises: A base (11) having a cavity (111) formed therein; A mounting plate (12) is disposed in the cavity (111), and the battery cell (10) is placed on the mounting plate (12); A pressing member (13), at least two of the pressing members (13) are pressed onto the battery cell (10), and the pressing members (13) are connected to the mounting plate (12).

8. The impact testing device according to claim 7, wherein: The base module (1) further comprises: A lifting member (15) is connected between the base (11) and the mounting plate (12), and the lifting member (15) is used to drive the mounting plate (12) to move upward along the Z axis relative to the base (11) so that the mounting plate (12) moves into the hollow cylindrical member (212).

9. The impact testing device according to claim 7, wherein: The mounting plate (12) is provided with M first mounting holes (121), and the pressing member (13) is provided with N second mounting holes (131), where M is an integer greater than N, and the aligned first mounting holes (121) and the second mounting holes (131) are fixed by fastening bolts (14).

10. A battery cell, characterized in that The battery cell is subjected to an impact test using the impact testing device according to any one of claims 1 to 9.

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