Test fixture for a lower protective plate of a battery pack

Abstract

Testing device for a lower protective plate of a battery pack, comprising: a base (100) configured to receive a lower protection plate (300), the base (100) being provided with a measuring groove (110) in which a pressure sensor (400) or a plastic deformation piece (500) is arranged, a base block (600) being arranged on the base (100), the lower protection plate (300) and the base (100) being spaced apart from each other by the base block (600) to form an impact cavity in which the measuring groove (110) is located; a testing mechanism (200) comprising a testing support (210) and an impact assembly (220), wherein the testing support (210) and the impact assembly (220) are arranged on one side of the base (100), wherein the impact assembly (220) is suspended on the testing support (210) and the impact assembly (220) is arranged directly above the base (100).

Description

[0001] This application claims priority to Chinese patent application No. 202421699147 filed with the Chinese Patent Office on July 17, 2024, the entire contents of which are incorporated into this application by reference. AREA OF REGISTRATION

[0002] The present application relates to the technical field of battery pack testing apparatuses, such as a testing apparatus for a lower protective plate of a battery pack. STATE OF THE ART

[0003] With the rapid development of the new energy battery industry, battery safety requirements are becoming increasingly stringent. For long-term use of an electric vehicle battery pack, the physical strength and impact resistance of the battery pack are becoming increasingly important. A large number of new energy vehicles on the market are prone to battery pack fires due to the bottom support, seriously endangering the life and property safety of drivers and passengers. Therefore, the strength of the battery pack's bottom protection plate is particularly important.

[0004] For new energy battery packs, there is no government standard on the protection of the bottom protective plate, and the main inspection is mainly based on the overall standard of the battery pack.

[0005] The cost of testing at the entire battery pack level is very high, and the efficiency is low. The economic cost and time required for testing are too high, making it unsuitable for large-batch testing. Furthermore, the overall battery pack testing is difficult to reflect the impact strength and deformation resistance of the bottom protection plate alone, which is not conducive to the early design of the bottom protection plate of the battery pack. DISCLOSURE OF THE UTILITY MODEL

[0006] The application provides a testing device for a bottom protective plate of a battery pack, which can perform the performance test of the impact resistance and deformation resistance of the bottom protective plate and realize the design parameters and standard quantification of the strength performance of the bottom protective plate.

[0007] A testing device for a lower protection plate of a battery pack is provided. It comprises a base and a testing mechanism. The base is configured to receive a lower protection plate, the base being provided with a measuring groove in which a pressure sensor or a plastic deformation piece is arranged, a support block being arranged on the base, the lower protection plate and the base being spaced apart by the support block to form an impact cavity in which the measuring groove is located; the testing mechanism comprises a testing post and an impact assembly, the testing post and the impact assembly being arranged on one side of the base, the impact assembly being suspended on the testing post and the impact assembly being arranged directly above the base.

[0008] Advantageous Effects of the Present Application: In the battery pack bottom protection plate testing apparatus of the present application, a base block is installed on the base, and then the bottom protection plate to be tested is placed on the base block, and the bottom protection plate is spaced between the base block and the bottom plate to form an impact cavity. Then, the impact assembly is lifted by the test post arranged on one side of the base, and the impact assembly is directly above the base. That is, the impact assembly is directly above the bottom protection plate, so that the impact assembly drops vertically from the test post to perform an impact and collision test on the bottom protection plate. During the testing process, a plurality of bottom protection plates with uniform specifications are prepared for testing.The pressure sensor and the plastic deformation piece are inserted into the measuring groove of the base. The pressure sensor measures the corresponding impact force value, and the plastic deformation piece measures the deformation value of the bottom protection plate after impact. This realizes the impact test data of the bottom protection plate. This is conducive to the realization of data quantification and is convenient for designing the strength standard and selecting the bottom protection plate corresponding to the battery pack according to the corresponding test data. This ensures that in the practical application of the battery pack, the bottom protection plate can provide sufficient support and impact resistance to the battery pack, thus ensuring the safety of the battery pack. Presentation of the registration

[0009] In it show Fig. 1 is a schematic structural diagram of a testing apparatus for a lower protective plate of a battery pack according to an embodiment of the present application; Fig. 2 is a schematic structural diagram of a base according to an embodiment of the present application; Fig. 3 is a schematic structural bottom view of the base according to an embodiment of the present application; Fig. 4 is a schematic structural diagram of a pressure sensor according to an embodiment of the present application; Fig. 5 is a schematic structural diagram of a supporting vertical bar according to an embodiment of the present application; Fig. 6 is a schematic structural diagram of the connection of a baffle assembly to a supporting crossbar according to an embodiment of the present application; Fig. 7 is a schematic structural diagram of another testing apparatus for a lower protective plate of a battery pack according to an embodiment of the present application; Fig. 8 is a schematic structural diagram of another testing apparatus for a lower protective plate of a battery pack according to an embodiment of the present application. Reference symbols:

[0010] 100, base; 110, measuring groove; 120, wire channel; 130, first mounting hole; 200, testing mechanism; 210, testing support; 211, supporting vertical rod; 211a, fixed rod; 211b, movable rod; 2111, height scale; 2112, first positioning hole; 2113, second positioning hole; 2114, plug pin; 212, supporting crossbar; 213, pulley; 214, connecting cables; 220, impact assembly; 221, impact beam; 222, impact head; 2221, impact part; 230, base; 240, reinforcing rib structure; 300, lower protective plate; 310, third mounting hole; 400, pressure sensors; 410, connecting wire; 500, plastic deformation piece; 600, support block; 610, second mounting hole. Concrete embodiments

[0011] The present application is described in more detail below with reference to specific embodiments and the accompanying drawings. It is understood that the specific embodiments described serve only to explain the present application without limiting it. Furthermore, it should be noted that, to facilitate the description, only parts related to the application are shown in the accompanying drawings, rather than all structures.

[0012] In the present application, the terms "connected to one another," "connect," "fasten," or the like, unless expressly stated otherwise, are to be understood in a broad sense. For example, this can refer to a fixed, detachable, or one-piece connection, as well as a mechanical or electrical connection. Direct connections, indirect connections, or connections made via an intermediate piece, as well as internal connections between two elements or interactions between two elements are also conceivable. As a person of ordinary skill in the art, one can use the facts of the case to determine the intended meaning of the terms used in the present application.

[0013] In the present application, a first feature that is arranged "above" or "below" a second feature may, unless expressly stated and defined otherwise, mean that the first feature directly contacts the second feature, or that the first feature and the second feature are in contact without direct contact via a further feature arranged therebetween. Furthermore, the first feature that is arranged "on", "above" the second feature, and "above" the second feature may, among other things, mean that the first feature is directly above and diagonally above the second feature, or that the horizontal elevation of the first feature is higher than that of the second feature. The first feature that is arranged "below" the second feature and "below" the second feature may, among other things, mean thatIt may be the case that the first feature is directly below and diagonally below the second feature, or that the horizontal elevation of the first feature is lower than that of the second feature.

[0014] In the description of the present embodiment, the terms "top," "bottom," "left," "right," etc., are used with reference to the illustrated orientation or positional relationship in the respective illustration, solely to describe the operation and, where appropriate, to simplify the description. In other words, these terms neither implicitly nor explicitly indicate the positioning, design, and operation of the device or element in question in a predetermined position, so that the application is not restricted here either. Furthermore, the terms "first" and "second," which have no particular meaning, are used merely to achieve a distinction in the description.

[0015] As in Fig. 1 to 6, a testing apparatus for a lower protection plate of a battery pack according to the present embodiment includes a base 100 and a testing mechanism 200. The base 100 is configured to receive a lower protection plate 300, the base 100 being provided with a measuring groove 110 in which a pressure sensor 400 or a plastic deformation piece 500 is disposed, a backing block 600 being disposed on the base 100, the lower protection plate 300 and the base 100 being spaced apart from each other by the backing block 600 to form an impact cavity in which the measuring groove 110 is located; the testing mechanism 200 includes a testing support 210 and an impact assembly 220, wherein the testing support 210 and the impact assembly 220 are arranged on one side of the base 100, wherein the impact assembly 220 is suspended from the testing support 210 and the impact assembly 220 is arranged directly above the base 100.

[0016] In the present embodiment, a support block 600 is installed on the base 100, and then the lower protection plate 300 to be tested is placed on the support block 600, and the lower protection plate 300 is arranged above the support block 600 at a distance from the bottom plate to form an impact cavity. Then, the impact assembly 220 is lifted by the test post 210 arranged on one side of the base 100, and the impact assembly 220 is located directly above the base 100. That is, the impact assembly 220 is located directly above the lower protection plate 300, so that the impact assembly 220 drops vertically from the test post 210 to perform an impact and collision test on the lower protection plate 300. At this time, during the testing process, a plurality of lower protection plates 300 with uniform specifications are prepared for testing.The pressure sensor 400 or the plastic deformation piece 500 is inserted into the measuring groove 110 of the base 100 to measure the corresponding impact force value through the pressure sensor 400, and the deformation value of the lower protection plate 300 after impact is obtained by measuring the plastic deformation piece 500. This realizes the impact test data of the lower protection plate 300. This is conducive to the realization of the quantification of the data and is convenient for designing the strength standard and selecting the lower protection plate 300 corresponding to the battery pack according to the corresponding test data. Thus, it is ensured that in the practical application of the battery pack, the lower protection plate 300 can provide sufficient support and impact resistance to the battery pack, thus ensuring the safety of the battery pack.

[0017] In one embodiment, the testing mechanism 200 further comprises a base 230 disposed on the other side of the base 100, with the testing support 210 detachably mounted on the base 230. Thus, the testing support 210 of different specifications can be exchanged according to the testing requirements of different lower protection plates 300 to meet the corresponding testing requirements, enabling flexible adaptation to testing a variety of lower protection plates 300 and providing good versatility.

[0018] In one embodiment, the test support 210 comprises a supporting vertical bar 211 and a supporting cross bar 212 connected to each other, wherein the baffle assembly 220 is connected to the supporting cross bar 212, the supporting cross bar 212 is connected to the supporting vertical bar 211, and an end of the supporting vertical bar 211 remote from the supporting cross bar 212 is connected to the base 230.

[0019] In one embodiment, the test post 210 comprises two supporting vertical rods 211, with the two ends of the supporting crossbar 212 connected to the two supporting vertical rods 211 to form a gantry-shaped test post 210. The impact assembly 220 is suspended from the supporting crossbar 212 of the gantry-shaped test post 210, and the impact assembly 220 is positioned directly above the base 100 so that the impact assembly 220 can fall vertically to perform an impact test on the lower guard plate 300 on the base 100.

[0020] In one embodiment, the test support 210 comprises, as shown in Fig. 7, a supporting vertical rod 211, one end of the supporting crossbar 212 is connected to the supporting vertical rod 211, and the test support 210 is an R-shaped structure, namely, an inverted L-shaped structure. The impact assembly 220 is suspended from an end of the supporting crossbar 212 remote from the support rod 211, and the impact assembly 220 is positioned directly above the base 100 so that the impact assembly 220 can fall vertically and perform an impact test on the lower protection plate 300 on the base 100.

[0021] In one embodiment, the test support 210 comprises, as shown in Fig.8, a supporting vertical rod 211 is formed to be bent into an arcuate structure, the two ends of the supporting cross rod 212 are connected to the supporting vertical rod 211, and the two ends of the supporting cross rod 212 are arranged at the same horizontal height. The impact assembly 220 is positioned at a position of the supporting cross rod 212 opposite the supporting vertical rod 211, and the impact assembly 220 is positioned directly above the base 100 so that the impact assembly 220 can fall vertically to perform an impact test on the lower protection plate 300 on the base 100.

[0022] In order to ensure the stability of the test support 210, the connection between the supporting vertical rod 211 and the base 230 and the connection of the supporting vertical rod 211 and the supporting cross rod 212 are both provided with a reinforcing rib structure 240 to ensure the overall stability of the test support 210 and then ensure the stability of the entire testing process.

[0023] In one embodiment, the supporting vertical rod 211 comprises a fixed rod 211a and a movable rod 211b, wherein the fixed rod 211a is fixedly connected to the base 230, one end of the movable rod 211b is telescopically connected to the fixed rod 211a, and the other end of the movable rod 211b is fixedly connected to the supporting crossbar 212. During the test, the movable rod 211b can be adjusted by the energy law to move telescopically on the fixed rod 211a according to the required amount of impact to adjust the height of the supporting crossbar 212, i.e.the height of the impact assembly 220 suspended on the supporting crossbar 212 is adjusted so that the impact assembly 220 achieves the corresponding impact strength for the lower protective plate 300 in the case of a vertical fall and the impact force value and the deformation value of the lower protective plate 300 under the action of the impact of a certain impact strength are obtained.

[0024] The supporting vertical rod 211 is provided with a height scale 2111, and the height scale 2111 can be arranged on the fixed rod 211a or the movable rod 211b, or only on the movable rod 211b, so that when adjusting the relative movement of the movable rod 211b and the fixed rod 211a, the height of the supporting crossbar 212 connected to the movable rod 211b is accurately obtained, that is, the height of the impact assembly 220, and the height of the impact assembly 220 is adjusted according to the preset impact strength. The fixed rod 211a is provided with a first positioning hole 2112. The movable rod 211b is provided with a plurality of second positioning holes 2113 corresponding to the first positioning hole 2112.When the movable rod 211b is moved to the corresponding position relative to the fixed rod 211a, a fixing member such as a pin 2114 is passed through the first positioning hole 2112 and the second positioning hole 2113 to realize the fixed positioning of the movable rod 211b and the fixed rod 211a, so that the supporting crossbar 212 connected to the movable rod 211b and the impact assembly 220 suspended from the supporting crossbar 212 are maintained at a fixed height.

[0025] In one embodiment, the impact assembly 220 comprises an impact beam 221 and an impact head 222, wherein the impact head 222 is arranged penetrating the impact beam 221 along a direction facing the base 100 and a hemispherical, conical or frustoconical impact part 2221 is arranged on a side of the impact head 222 facing the base 100.

[0026] In one embodiment, the test support 210 is provided with a pulley 213, and the impact assembly 220 is connected to the pulley 213 via a connecting cable 214 for suspension on the test support 210. By connecting the pulley 213, the impact assembly 220 can be slidably connected to the pulley 213 by the connecting cable 214. The pulley 213 can play a certain limiting role when the impact assembly 220 falls vertically, and the impact assembly 220 is guaranteed to fall vertically along a rolling groove of the pulley 213 by the connecting cable 214; this is advantageous for preventing displacement of the impact assembly 220 during the falling process.The connection via the deflection pulley 213 ensures smooth falling during vertical falling of the impact assembly 220, thus reducing the energy loss of the impact assembly 220 during the falling process, reducing the influence on the test results, and ensuring the accuracy of the test result.

[0027] In one embodiment, the pressure sensor 400 is placed in the measuring groove 110 and arranged at intervals from the lower protective plate 300, wherein the end surface of a side of the pressure sensor 400 facing the lower protective plate 300 is flush with the end surface of a side of the base 100 facing the lower protective plate 300, in order to maintain the amplitude of the deformation in the impact cavity after impacting the lower protective plate 300, and to simulate a real situation in which the battery module is subjected to the impact force transmitted from the lower protective plate 300 when the lower protective plate 300 is subjected to an impact, and the impact force value determined by the test and transmitted to the battery module upon impact with the lower protective plate 300 is closer to the value of the real impact, and the accuracy of the test is improved.

[0028] In one embodiment, the base 100 is provided with a wire channel 120, one end of which is connected to the measuring groove 110 and the other end of which extends to a side edge of the base 100, so that the pressure sensor 400 is installed in the measuring groove 110, and a connecting wire 410 of the pressure sensor 400 can be guided through the wire channel 120 to the outside of the base 100 and connected to a data terminal or a control terminal to realize data transmission and recording. By disposing the wire channel 120 on the base 100, the interference of the connecting wire 410 of the pressure sensor 400 with the flatness of the base 100 can be avoided. The horizontal placement of the base 100 is maintained, and the accuracy of the test is improved.

[0029] In one embodiment, the plastic deformation piece 500 fills the measurement groove 110 and is arranged at intervals from the lower protection plate 300, with the end surface of a side of the plastic deformation piece 500 facing the lower protection plate 300 being flush with the end surface of a side of the base 100 facing the lower protection plate 300, to simulate the actual situation in which the battery module is subjected to the impact force transmitted from the lower protection plate 300 when the lower protection plate 300 is subjected to an impact, so that the degree of influence of the deformation value of the lower protection plate 300 after the impact on the battery module is obtained under the actual situation and the accuracy of the test is improved. In actual operation, the plastic deformation piece 500 is made of ultralight clay.The ultralight clay is soft, has good formability, and can accurately and effectively reflect the deformation amount of the lower protective plate 300. The ultralight clay can be repeatedly reused, which is safe and environmentally friendly. Of course, in addition to the present embodiment, other plastic deformation pieces 500, such as plastic deformation rubber and the like, can also be used, as long as the plastic deformation of the plastic deformation piece 500 can be realized to measure and reflect the deformation of the lower protective plate 300. Such embodiments are all within the scope of the present application.

[0030] In one embodiment, the base 100 is detachably connected to the support block 600, wherein the base 100 is provided with a plurality of first mounting holes 130, wherein the support block 600 is provided with a plurality of second mounting holes 610 corresponding to the first mounting holes 130, and wherein the lower protective plate 300 is provided with a third mounting hole 310 associated with the first mounting holes 130 and the second mounting holes 610. The lower protection plate 300 is usually provided with the third mounting hole 310 installed and connected to the battery pack box, so that corresponding to the third mounting hole 310 on the lower protection plate 300, the first mounting hole 130 and the second mounting hole 610 are arranged according to the position of the third mounting hole 310, whereby the lower protection plate 300 can be installed and fixed to the base 100 and the support block 600.

[0031] In actual operation, taking the example of the lower protection plate 300 of a cuboid battery pack, the plate surface of the lower protection plate 300 is rectangular. The third mounting hole 310 on the lower protection plate 300 is arranged along the four edges of the lower protection plate 300, with the support block 600 -shaped, so that the second mounting hole 610 on the base block 600 is arranged correspondingly with the third mounting hole 310, the first mounting hole 130 on the base is also arranged correspondingly with the second mounting hole 610 and the third mounting hole 310 and thus the assembly and fastening of the lower protective plate 300, the base block 600 and the base 100 is ensured.

[0032] The base 100 is provided with a plurality of first mounting holes 130 arranged in a shaped arrangement, so that one group of first mounting holes 130 can be used to install the lower protective plate 300 according to the size of the lower protective plate 300 of different specifications, and also according to the corresponding specifications of the lower protective plate 300, the support block 600 of the corresponding specification is used, so that the universality of the base 100 can be improved to avoid the need to provide a plurality of bases 100 in coordination with lower protective plates 300 of different specifications, which is conducive to reducing production costs.

Claims

[1] Testing device for a lower protective plate of a battery pack, comprising: a base (100) configured to receive a lower protection plate (300), the base (100) being provided with a measuring groove (110) in which a pressure sensor (400) or a plastic deformation piece (500) is arranged, a base block (600) being arranged on the base (100), the lower protection plate (300) and the base (100) being spaced apart from each other by the base block (600) to form an impact cavity in which the measuring groove (110) is located; a testing mechanism (200) comprising a testing support (210) and an impact assembly (220), wherein the testing support (210) and the impact assembly (220) are arranged on one side of the base (100), wherein the impact assembly (220) is suspended on the testing support (210) and the impact assembly (220) is arranged directly above the base (100). [2] The battery pack lower protection plate testing apparatus according to claim 1, wherein the testing mechanism (200) further comprises a pedestal (230) disposed on the other side of the base (100), the testing support (210) being detachably mounted on the pedestal (230). [3] The battery pack lower protection plate testing apparatus according to claim 2, wherein the testing support (210) comprises a supporting vertical rod (211) and a supporting cross rod (212) connected to each other, the baffle assembly (220) being connected to the supporting cross rod (212), the supporting cross rod (212) being connected to the supporting vertical rod (211), and an end of the supporting vertical rod (211) remote from the supporting cross rod (212) being connected to the base (230). [4] The battery pack lower protection plate testing apparatus according to claim 3, wherein the testing support (210) comprises two supporting vertical rods (211), the two ends of the supporting cross bar (212) are connected to the two supporting vertical rods (211), and the testing support (210) is a door-shaped structure. [5] The battery pack lower protection plate testing apparatus according to claim 3, wherein the testing post (210) comprises a supporting vertical rod (211), one end of the supporting cross rod (212) is connected to the supporting vertical rod (211), and the testing post (210) is an R-shaped structure. [6] The battery pack lower protection plate testing apparatus according to claim 3, wherein the testing support (210) comprises a supporting vertical rod (211) formed to be bent into an arcuate structure, the two ends of the supporting cross rod (212) are connected to the supporting vertical rod (211), and the two ends of the supporting cross rod (212) are arranged at the same horizontal height. [7] A battery pack lower protection plate testing apparatus according to any one of claims 3 to 6, wherein the supporting vertical rod (211) comprises a fixed rod (211a) and a movable rod (211b), the fixed rod (211a) being fixedly connected to the base (230), one end of the movable rod (211b) being telescopically connected to the fixed rod (211a), and the other end of the movable rod (211b) being fixedly connected to the supporting cross rod (212). [8] A testing apparatus for a lower protective plate of a battery pack according to any one of claims 1 to 7, wherein the impact assembly (220) comprises an impact beam (221) and an impact head (222), the impact head (222) being arranged penetrating the impact beam (221) along a direction facing the base (100), and a hemispherical, conical or frusto-circular cone-shaped impact part (2221) being arranged on a side of the impact head (222) facing the base (100). [9] A battery pack lower protection plate testing apparatus according to any one of claims 1 to 8, wherein the test support (210) is provided with a pulley (213), and the impact assembly (220) is connected to the pulley (213) via a connecting cable (214) to be suspended on the test support (210). [10] A testing device for a lower protective plate of a battery pack according to any one of claims 1 to 9, wherein the pressure sensor (400) is placed in the measuring groove (110) and arranged at intervals from the lower protective plate (300), the end face of a side of the pressure sensor (400) facing the lower protective plate (300) being flush with the end face of a side of the base (100) facing the lower protective plate (300). [11] A battery pack lower protection plate testing apparatus according to any one of claims 1 to 10, wherein the base (100) is provided with a wire channel (120), one end of the wire channel (120) being connected to the measuring groove (110) and the other end of the wire channel (120) extending to a side edge of the base (100). [12] A testing device for a lower protective plate of a battery pack according to any one of claims 1 to 9, wherein the plastic deformation piece (500) fills the measuring groove (110) and is arranged at intervals from the lower protective plate (300), the end face of a side of the plastic deformation piece (500) facing the lower protective plate (300) being flush with the end face of a side of the base (100) facing the lower protective plate (300). [13] A testing apparatus for a lower protection plate of a battery pack according to any one of claims 1 to 12, wherein the base (100) is detachably connected to the support block (600), the base (100) being provided with a plurality of first mounting holes (130), the support block (600) being provided with a plurality of second mounting holes (610) corresponding to the first mounting holes (130), and the lower protection plate (300) being provided with a third mounting hole (310) corresponding to the first mounting holes (130) and the second mounting holes (610).

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