Battery measuring device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery measuring device, comprising a bracket, a distance measuring detection element, a measuring plate assembly, an elastic element and a positioning element. The measuring plate assembly comprises a first measuring plate, a second measuring plate and a third measuring plate. A pressure detection element is clamped between the first measuring plate and the bracket. The battery can be placed on a side of the first measuring plate away from the pressure detection element and clamped between the first measuring plate and the second measuring plate. The second measuring plate and the third measuring plate are both movably connected to the bracket and can respectively move back and forth along the expansion direction of the battery. The third measuring plate is located on a side of the second measuring plate away from the battery. The distance measuring detection element is used to measure the distance between the second measuring plate and the third measuring plate. Two ends of the elastic element are respectively connected to the second measuring plate and the third measuring plate. The positioning element is arranged on the bracket and can be selectively detachably connected to the second measuring plate or the third measuring plate. The expansion force and expansion amount of the battery can be measured by the battery measuring device.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery measuring device. Background Art

[0002] When a lithium-ion battery is charged, the insertion and extraction of lithium ions will cause changes in the thickness of the battery cell. That is, when the battery cell is charged, lithium ions are extracted from the positive electrode and embedded in the negative electrode, causing the distance between the negative electrode layers to increase, resulting in expansion. The thicker the battery cell, the greater the expansion. On the other hand, during the charging and discharging process of lithium-ion batteries, chemical reactions occur, generating gases. The generated gases cause the internal pressure of the battery cell to increase, increasing the expansion behavior of the battery cell. The degree of expansion of lithium-ion batteries affects the mechanical properties of the battery cell in the PACK stage, so the degree of expansion of lithium-ion batteries is a key indicator for evaluating their performance.

[0003] At present, there are two ways to measure the expansion degree of lithium-ion batteries: one is the detection of expansion force, and the other is the detection of deformation after expansion. Currently, the industry requires two different sets of equipment and methods to detect these two items, which affects the experimental cost, operation difficulty and experimental efficiency. At the same time, the measurement error brought by the replacement of the fixture will affect the interactivity between the two results.

[0004] Therefore, it is urgent to propose a battery measuring device to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a battery measuring device, which can measure both the expansion force and the expansion amount of the battery, reduce experimental costs, improve experimental efficiency and reduce the interactive impact between the two test results of expansion force and expansion amount. In addition, the battery measuring device can switch between the two measurement modes by adjusting the connection relationship between the positioning element and the second measuring plate and the third measuring plate.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Battery measuring device, comprising:

[0008] Bracket and ranging detection element;

[0009] A measuring plate assembly, the measuring plate assembly includes a first measuring plate, a second measuring plate and a third measuring plate, a pressure detection element is sandwiched between the first measuring plate and the bracket, a battery can be placed on a side of the first measuring plate away from the pressure detection element, and the battery can be sandwiched between the first measuring plate and the second measuring plate, the second measuring plate and the third measuring plate are both movably connected to the bracket, the second measuring plate and the third measuring plate can respectively move back and forth along the expansion direction of the battery, the third measuring plate is located on a side of the second measuring plate away from the battery, and the distance detection element is used to measure the distance between the second measuring plate and the third measuring plate;

[0010] An elastic element, two ends of which are respectively connected to the second measuring plate and the third measuring plate;

[0011] A positioning element is arranged on the bracket, and the positioning element can be selectively detachably connected to the second measuring plate or the third measuring plate.

[0012] Optionally, when measuring the expansion force of the battery, the positioning element is connected to the second measuring plate to make the second measuring plate move or remain stationary relative to the bracket.

[0013] Optionally, when measuring the expansion amount of the battery, the positioning element is connected to the third measuring plate to make the third measuring plate move or remain stationary relative to the bracket.

[0014] Optionally, the third measuring plate includes a plate body and a movable part, the plate body is provided with a through hole, the movable part is movably connected to the plate body, and the movable part can cover the through hole, one end of the positioning element is connected to the bracket, and the other end of the positioning element is detachably connected to the plate body through the movable part.

[0015] Optionally, a slide groove is provided on the plate body, a perforation is provided at the bottom of the slide groove, and the movable part is slidably matched with the slide groove.

[0016] Optionally, the third measuring plate further includes a first limiting portion and a second limiting portion, the first limiting portion is arranged on the plate body, the second limiting portion is arranged on the movable member, and the first limiting portion and the second limiting portion are detachably connected to allow the movable member to be movably connected to the plate body.

[0017] Optionally, the positioning element is provided with an external thread, the second measuring plate is provided with a first threaded hole, the movable member is provided with a second threaded hole, and the external thread is selectively threadably matched with the first threaded hole or the second threaded hole.

[0018] Optionally, the distance measuring detection element is a displacement sensor, which includes a sensing element and a transmitting element. One of the sensing element and the transmitting element is arranged on the second measuring plate, and the other is arranged on the third measuring plate, and the sensing element and the transmitting element are arranged opposite to each other.

[0019] Optionally, the distance measuring detection element is a ruler, one end of the ruler is fixedly connected to one of the second measuring plate and the third measuring plate, and the other end of the ruler is movably connected to the other one.

[0020] Optionally, the bracket includes a first support plate, a second support plate and a guide rod, the first support plate and the second support plate are arranged opposite to each other, and the first support plate and the second support plate are connected by the guide rod, and the second measuring plate and the third measuring plate are slidably mounted on the guide rod.

[0021] Beneficial effects of the utility model:

[0022] The battery measuring device provided by the utility model is provided with a distance detection element and a pressure detection element. The pressure detection element is clamped between the first measuring plate and the bracket. The bracket is provided with a second measuring plate, a third measuring plate and a positioning element. The second measuring plate and the third measuring plate are both movably connected to the bracket. The positioning element can be selectively detachably connected to the second measuring plate or the third measuring plate. The battery can be clamped between the first measuring plate and the second measuring plate. When measuring the expansion force of the battery, the positioning element is separated from the third measuring plate and connected to the second measuring plate. The expansion force of the battery can be detected by the pressure detection element; when measuring the expansion amount of the battery, the positioning element is separated from the second measuring plate and connected to the third measuring plate. The expansion amount of the battery can be detected by the distance detection element. It can be seen that the battery measuring device can measure both the expansion force and the expansion amount of the battery, can reduce the experimental cost, improve the experimental efficiency and reduce the interactive influence between the two detection results of the expansion force and the expansion amount. In addition, by adjusting the connection relationship between the positioning element and the second measuring plate and the third measuring plate, it is possible to switch between the two measurement modes, which is simple to operate and further improves the experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The structure diagram of the battery measuring device provided by the embodiment of the utility model when the positioning element is connected to the second measuring plate Figure 1 ;

[0024] Figure 2 The structure diagram of the battery measuring device provided by the embodiment of the utility model when the positioning element is connected to the second measuring plate Figure 2 ;

[0025] Figure 3 The structure diagram of the battery measuring device provided by the embodiment of the utility model when the positioning element is connected to the third measuring board Figure 1 ;

[0026] Figure 4 The structure diagram of the battery measuring device provided by the embodiment of the utility model when the positioning element is connected to the third measuring board Figure 2 .

[0027] In the figure:

[0028] 10. Battery;

[0029] 100, bracket; 110, first support plate; 120, second support plate; 130, guide rod; 210, distance measuring detection element; 220, pressure detection element; 310, first measuring plate; 320, second measuring plate; 321, first threaded hole; 322, first boss; 323, second boss; 330, third measuring plate; 331, plate body; 3311, perforation; 3312, slide groove; 332, movable part; 3321, second threaded hole; 400, elastic element; 500, positioning element. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The present embodiment provides a battery measuring device, which can measure both the expansion force and the expansion amount of the battery, thereby reducing experimental costs, improving experimental efficiency, and reducing the interactive impact between the two test results of the expansion force and the expansion amount. In addition, the battery measuring device can switch between the two measurement modes by adjusting the connection relationship between the positioning element and the second measuring plate and the third measuring plate.

[0035] Specifically, Figures 1 to 4 As shown, the battery measuring device includes a bracket 100, a distance measuring detection element 210, a measuring plate assembly, an elastic element 400 and a positioning element 500, wherein the measuring plate assembly includes a first measuring plate 310, a second measuring plate 320 and a third measuring plate 330, a pressure detection element 220 is sandwiched between the first measuring plate 310 and the bracket 100, the battery 10 can be placed on the side of the first measuring plate 310 away from the pressure detection element 220, and the battery 10 can be sandwiched between the first measuring plate 310 and the second measuring plate 320, the second measuring plate 320 and the third measuring plate 330 are both movably connected to the bracket 100, and the second measuring plate 320 and the third measuring plate 330 can respectively move along the expansion direction ( Figure 1 The third measuring plate 330 is located on the side of the second measuring plate 320 away from the battery 10. The distance measuring detection element 210 is used to measure the distance between the second measuring plate 320 and the third measuring plate 330, that is, the distance measuring detection element 210 can be used to measure the distance moved by the second measuring plate 320 toward the third measuring plate 330. The two ends of the elastic element 400 are respectively connected to the second measuring plate 320 and the third measuring plate 330. The positioning element 500 is arranged on the bracket 100, and the positioning element 500 can be selectively detachably connected to the second measuring plate 320 or the third measuring plate 330.

[0036] The battery measuring device provided in this embodiment is provided with a distance measuring detection element 210 and a pressure detection element 220. The pressure detection element 220 is sandwiched between the first measuring plate 310 and the bracket 100. The bracket 100 is provided with a second measuring plate 320, a third measuring plate 330 and a positioning element 500. The second measuring plate 320 and the third measuring plate 330 are both movably connected to the bracket 100. The positioning element 500 can be selectively detachably connected to the second measuring plate 320 or the third measuring plate 330. The battery 10 can be sandwiched between the first measuring plate 310 and the bracket 100. Between the first measuring plate 310 and the second measuring plate 320, when measuring the expansion force of the battery 10, the positioning element 500 is separated from the third measuring plate 330, and the positioning element 500 is connected to the second measuring plate 320, and the expansion force of the battery 10 can be detected through the pressure detection element 220; when measuring the expansion amount of the battery 10, the positioning element 500 is separated from the second measuring plate 320, and the positioning element 500 is connected to the third measuring plate 330, and the expansion amount of the battery 10 can be detected through the distance detection element 210. It can be seen that the battery measuring device can measure both the expansion force of the battery 10 and the expansion amount of the battery 10, which can reduce the experimental cost, improve the experimental efficiency, and reduce the interactive influence between the two detection results of the expansion force and the expansion amount. In addition, by adjusting the connection relationship between the positioning element 500 and the second measuring plate 320 and the third measuring plate 330, it is possible to switch between the two measurement modes, which is simple to operate and further improves the experimental efficiency.

[0037] When measuring the expansion force of the battery 10, the battery 10 is clamped between the first measuring plate 310 and the second measuring plate 320, the positioning element 500 is separated from the third measuring plate 330, and the positioning element 500 is connected to the second measuring plate 320, so that the second measuring plate 320 moves relative to the bracket 100. When the second measuring plate 320 moves to abut the battery 10, the second measuring plate 320 is stationary by fastening the positioning element 500 and the bracket 100. At this time, the pressure value measured by the pressure detection element 220 is 0. When the battery 10 expands when powered on, the battery 10 applies expansion force to the second measuring plate 320 and the first measuring plate 310 respectively, and the first measuring plate 310 transmits the expansion force to the pressure detection element 220. Since the second measuring plate 320 is connected and fixed to the positioning element 500 at this time, the second measuring plate 320 is stationary relative to the bracket 100 at this time, and the pressure detection element 220 clamped between the first measuring plate 310 and the bracket 100 can detect the expansion force of the battery 10.

[0038] When measuring the expansion amount of the battery 10, the positioning element 500 is separated from the second measuring plate 320, and the positioning element 500 is connected to the third measuring plate 330, so that the third measuring plate 330 moves relative to the bracket 100, and the second measuring plate 320 is moved synchronously by the elastic element 400 connected between the third measuring plate 330 and the second measuring plate 320. When the second measuring plate 320 moves to affix the battery 10, the third measuring plate 330 is stationary by fastening the positioning element 500 to the bracket 100. At this time, the pressure detection element The pressure value measured by the distance measuring detection element 220 is 0, and when the battery 10 expands when powered on, the battery 10 applies expansion force to the second measuring plate 320 and the first measuring plate 310 respectively, and the second measuring plate 320 moves toward the third measuring plate 330 under the force. Since the third measuring plate 330 is connected and fixed to the positioning element 500 at this time, the third measuring plate 330 is stationary relative to the bracket 100 at this time, and the distance measured by the distance measuring detection element 210 for the second measuring plate 320 to move toward the third measuring plate 330 is the expansion amount of the battery 10. It can be understood that the third measuring plate 330 is connected to the second measuring plate 320 through the elastic element 400, and the elastic element 400 can not only prevent the second measuring plate 320 from directly pressing on the battery 10 under the action of gravity, affecting the measurement accuracy of the expansion amount, but also provide a movable space for the second measuring plate 320 when the battery 10 expands, so that it can move relative to the third measuring plate 330, thereby improving the measurement accuracy of the expansion amount.

[0039] When placing the battery 10 on the first measuring plate 310, the second measuring plate 320 and the third measuring plate 330 are not fixed to the positioning element 500, and the second measuring plate 320 and the third measuring plate 330 are moved along the D1 direction, and the battery 10 is placed on the first measuring plate 310, and then the second measuring plate 320 and the third measuring plate 330 are moved along the D2 direction until the second measuring plate 320 is clamped on the side of the battery 10 away from the first measuring plate 310. When the thickness of the measured battery 10 is different, the distance between the second measuring plate 320 and the first measuring plate 310 can be adjusted by adjusting the position of the second measuring plate 320 and the third measuring plate 330 on the bracket 100, and the battery 10 is smoothly placed on the first measuring plate 310, so that the battery measuring device can adapt to batteries 10 of different thicknesses, thereby improving the universality of the battery measuring device.

[0040] In addition, before measuring the expansion of the battery 10, the position of the third measuring plate 330 on the bracket 100 can be adjusted (at this time, the second measuring plate 320 is located on the side of the battery 10 away from the first measuring plate 310). When the elastic element 400 reaches a natural state (the elastic element 400 is neither compressed nor stretched), the positioning element 500 is fixedly connected to the third measuring plate 330 so that the third measuring plate 330 is stationary relative to the bracket 100 to prevent the second measuring plate 320 from directly pressing on the battery 10 under the action of gravity, and to avoid the elastic element 400 being over-compressed in the initial state, so that during the measurement of the expansion of the battery 10, the battery 10 has not reached the maximum expansion when the elastic element 400 reaches the maximum compression, thereby affecting the accuracy of measuring the expansion of the battery 10.

[0041] Optionally, the elastic element 400 may be a spring or rubber.

[0042] Alternatively, if Figures 1 to 4 As shown, the third measuring plate 330 includes a plate body 331 and a movable member 332. The plate body 331 is provided with a through hole 3311. The movable member 332 is movably connected to the plate body 331, and the movable member 332 can be covered at the through hole 3311. One end of the positioning element 500 is connected to the bracket 100, and the other end of the positioning element 500 can pass through the through hole 3311 and be detachably connected to the second measuring plate 320, and the other end of the positioning element 500 is detachably connected to the plate body 331 through the movable member 332. When measuring the expansion force of the battery 10, the movable member 332 is moved so that the movable member 332 and the through hole 3311 are staggered with each other, so that the other end of the positioning element 500 can pass through the through hole 3311 and be connected to the second measuring plate 320. When measuring the expansion amount of the battery 10, the movable member 332 is moved so that the movable member 332 is covered at the through hole 3311, so that the other end of the positioning element 500 can be connected to the movable member 332. It is understandable that the movable member 332 may be in a plate-shaped, block-shaped, or sheet-shaped structure.

[0043] Furthermore, if Figures 1 to 4As shown, a slide groove 3312 is provided on the plate body 331, and a perforation 3311 is provided at the bottom of the slide groove 3312. The movable member 332 slides in the slide groove 3312 to adjust the relative position of the movable member 332 and the perforation 3311. It should be pointed out that the extension direction of the slide groove 3312 can be multiple. In addition, multiple slide grooves 3312 can be provided on the plate body 331, and the extension directions of the multiple slide grooves 3312 are different. The multiple slide grooves 3312 are all slidably matched with the movable member 332, so that the movable member 332 can slide in multiple different directions to improve the adaptability of the sliding direction of the movable member 332. Further, the slide groove 3312 can be a square groove, a dovetail groove, a stepped groove, etc., and the movable member 332 is provided with a sliding portion that is adapted to the shape of the slide groove 3312.

[0044] In another embodiment, a rotating shaft is provided on the plate body 331, the axis of the rotating shaft is parallel to the axis of the through hole 3311, the movable part 332 is sleeved on the rotating shaft, and the movable part 332 is rotatably connected to the plate body 331 through the rotating shaft, and the movable part 332 is rotated so that the movable part 332 can cover the through hole 3311 and the movable part 332 and the through hole 3311 are staggered with each other.

[0045] Furthermore, the third measuring plate 330 also includes a first limiting portion and a second limiting portion, the first limiting portion is arranged on the plate body 331, and the second limiting portion is arranged on the movable part 332, and the first limiting portion and the second limiting portion are detachably connected to make the movable part 332 movably connected to the plate body 331 and realize the limiting effect on the movable part 332.

[0046] Exemplarily, the first limiting portion is arranged on the bottom of the slide groove 3312 and / or the inner wall of the slide groove 3312, and the first limiting portion is arranged close to the perforation 3311. When the movable part 332 slides to the position covering the perforation 3311, the first limiting portion is connected to the second limiting portion to achieve the limitation of the movable part 332. This structural design can improve the reliability and convenience of the connection between the movable part 332 and the positioning element 500.

[0047] In order to facilitate the assembly of the movable member 332 and the plate body 331, the slide groove 3312 can be set as a through groove. In this case, the first limit portion can be set at a position close to the edge of the slide groove 3312. When the movable member 332 slides to the position of the edge of the slide groove 3312, the first limit portion is connected to the second limit portion to prevent the movable member 332 from sliding out of the slide groove 3312, thereby improving the consistency of the structure of the third measuring plate 330. Of course, in actual production, the first limit portion can be set at the edge of the slide groove 3312 and at a position close to the through hole 3311, respectively, according to the use requirements.

[0048] It should be pointed out that the specific structure of the first limiting portion and the second limiting portion can be in various forms. For example, one of the first limiting portion and the second limiting portion is a buckle, and the other is a slot, and the buckle and the slot are detachably connected; or, one of the first limiting portion and the second limiting portion is a magnet, and the other is an iron block.

[0049] Alternatively, if Figures 1 to 4 As shown, the positioning element 500 is provided with an external thread, the second measuring plate 320 is provided with a first threaded hole 321, and the movable part 332 is provided with a second threaded hole 3321. The external thread selectively cooperates with the first threaded hole 321 or the second threaded hole 3321. By screwing the positioning element 500, the positioning element 500 can be detachably connected with the second measuring plate 320 and the movable part 332. The operation method is simple and the connection reliability is high.

[0050] Furthermore, a third threaded hole (not shown in the figure) is provided on the bracket 100, and the external thread is threadedly matched with the third threaded hole. Through the threaded matching of the third threaded hole and the external thread, the positioning element 500 is fixed on the bracket 100, and then when the external thread is threadedly connected to the first threaded hole 321 (when the positioning element 500 is connected to the second measuring plate 320), the second measuring plate 320 can be moved or stationary relative to the bracket 100, and when the external thread is threadedly connected to the second threaded hole 3321 (when the positioning element 500 is connected to the movable part 332), the plate body 331 can be moved or stationary relative to the bracket 100 (that is, the third measuring plate 330 is stationary relative to the bracket 100).

[0051] In this embodiment, the positioning element 500 is a screw. Of course, in other embodiments, the positioning element 500 may also include a rotary cylinder and a bolt. Specifically, the fixed end of the rotary cylinder is arranged on the bracket 100, and the bolt is arranged on the driving end of the rotary cylinder. The forward and reverse rotation of the rotary cylinder can realize the threaded cooperation of the bolt with the first threaded hole 321 and the second threaded hole 3321 respectively, thereby realizing the detachable connection between the positioning element 500 and the second measuring plate 320 and the third measuring plate 330 respectively.

[0052] In another embodiment, the positioning element 500 is a reciprocating driving member such as an electric telescopic rod or a reciprocating cylinder. The fixed end of the reciprocating driving member is arranged on the bracket 100, and the driving end of the reciprocating driving member is provided with a buckle. The second measuring plate 320 and the movable part 332 are respectively provided with a slot that can be detachably engaged with the buckle. The buckle can be engaged with the two slots respectively by driving the reciprocating driving member in the forward and reverse directions, thereby realizing the detachable connection between the positioning element 500 and the second measuring plate 320 and the third measuring plate 330 respectively.

[0053] Optionally, the first threaded hole 321 is a threaded blind hole to prevent foreign matter from falling through the first threaded hole 321 onto the surface of the battery 10 facing away from the first measuring plate 310 when measuring the expansion force of the battery 10 , thereby reducing the risk of damaging the battery 10 .

[0054] Furthermore, if Figures 1 to 4 As shown, a first boss 322 is provided on the side of the second measuring plate 320 facing the third measuring plate 330, and a first threaded hole 321 is opened on the first boss 322, so as to extend the length of the first threaded hole 321 as much as possible, expand the connection length between the first threaded hole 321 and the external thread, and improve the reliability of the connection between the positioning element 500 and the second measuring plate 320.

[0055] It should be noted that, in other embodiments, the first threaded hole 321 may also be a threaded through hole, as long as the positioning element 500 does not penetrate the surface of the second measuring plate 320 facing the first measuring plate 310. It should also be noted that, in this embodiment, the second threaded hole 3321 may be a threaded blind hole or a threaded through hole, as long as the positioning element 500 does not interfere with the movement of the second measuring plate 320 toward the third measuring plate 330 after the positioning element 500 is connected to the movable part 332.

[0056] Alternatively, if Figures 1 to 4 As shown, the distance measuring detection element 210 is a displacement sensor, which includes a sensing element and a transmitting element. One of the sensing element and the transmitting element is arranged on the second measuring plate 320, and the other is arranged on the third measuring plate 330, and the sensing element and the transmitting element are arranged opposite to each other. The sensing element is used to receive the signal emitted by the transmitting element to detect the distance moved by the second measuring plate 320 toward the third measuring plate 330.

[0057] Furthermore, if Figures 1 to 4 As shown, a second boss 323 is provided on the side wall of the second measuring plate 320, one of the sensing element and the emitting element is disposed on the second boss 323, and the other is disposed on the side wall of the third measuring plate 330, so as to prevent the sensing element and the emitting element from hindering the movement of the second measuring plate 320. It is understandable that, in other embodiments, the second boss 323 may be disposed on the side wall of the third measuring plate 330, one of the sensing element and the emitting element may be disposed on the second boss 323, and the other may be disposed on the side wall of the second measuring plate 320, according to actual application requirements.

[0058] In another embodiment, the distance measuring detection element 210 is a ruler, one end of the ruler is fixedly connected to one of the second measuring plate 320 and the third measuring plate 330, and the other end of the ruler is movably arranged in the other of the second measuring plate 320 and the third measuring plate 330, and the other end of the ruler is fixedly connected to the first measuring plate 310 or the bracket 100. When measuring the expansion amount of the battery 10, before the battery 10 starts to expand, the data value of the ruler (hereinafter referred to as the first value) is read, and after the battery 10 starts to expand, the data value of the ruler (hereinafter referred to as the second value) is read again. The difference between the first value and the second value is the distance moved by the second measuring plate 320 toward the third measuring plate 330, that is, the expansion amount of the battery 10.

[0059] Alternatively, if Figures 1 to 4 As shown, the bracket 100 includes a first support plate 110, a second support plate 120 and a guide rod 130. The first support plate 110 and the second support plate 120 are arranged opposite to each other. The two ends of the guide rod 130 are respectively connected to the first support plate 110 and the second support plate 120 by bolts (not shown in the figure). The second measuring plate 320 and the third measuring plate 330 are slidably mounted on the guide rod 130 to guide the movement of the second measuring plate 320 and the third measuring plate 330.

[0060] Furthermore, if Figures 1 to 4 As shown, the pressure detection element 220 is connected to the first support plate 110 (it can be fixedly connected by welding or the like, or can be detachably connected by connecting members such as bolts and nuts), and the third threaded hole is opened on the second support plate 120.

[0061] Alternatively, if Figures 1 to 4 As shown, the elastic element 400 is sleeved on the guide rod 130 to prevent the elastic element 400 from radial deformation, thereby improving the measurement accuracy of the expansion amount of the battery 10.

[0062] Alternatively, if Figures 1 to 4As shown, there are four guide rods 130, which are evenly distributed along the circumference of the second measuring plate 320, and each guide rod 130 is sleeved with an elastic element 400. The first threaded hole 321 is located at the center of the second measuring plate 320, and the through hole 3311 is located at the center of the plate body 331. When measuring the expansion force of the battery 10, the positioning element 500 can pass through the center of the plate body 331 and connect with the center of the second measuring plate 320. When the battery 10 expands when powered on, the positioning element 500 applies pressure to the center of the second measuring plate 320, so that the second measuring plate 320 can transfer the pressure to the battery 10 more evenly, which has the effect of improving the measurement accuracy. Furthermore, when measuring the expansion of the battery 10, the movable part 332 moves to the center of the plate 331 to cover the through hole 3311, and then the positioning element 500 is connected to the movable part 332. When the battery 10 expands when energized, the positioning element 500 applies pressure to the center of the plate 331 through the movable part 332, so that the plate 331 can transfer the pressure to the four elastic elements 400 more evenly, thereby improving the uniformity of the force applied to the second measuring plate 320 and having the effect of improving the measurement accuracy.

[0063] Alternatively, if Figures 1 to 4 As shown, the first measuring plate 310 is slidably mounted on the guide rod 130. When measuring the expansion force of the battery 10, the battery 10 is clamped between the first measuring plate 310 and the second measuring plate 320. After the battery 10 expands due to power-on, the first measuring plate 310 has a slight displacement in the direction of D2. Compared with fixing the first measuring plate 310 on the guide rod 130, the structure in which the first measuring plate 310 is slidably mounted on the guide rod 130 solves the problem that the first measuring plate 310 applies a force in the direction of D1 to the battery 10 when measuring the expansion force of the battery 10, thereby improving the measurement accuracy of the expansion force of the battery 10.

[0064] Furthermore, a sliding bearing (not shown in the figure) is provided on the first measuring plate 310 , and the sliding bearing is sleeved on the guide rod 130 to guide the displacement of the first measuring plate 310 , thereby further improving the measurement accuracy of the expansion force of the battery 10 .

[0065] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery measuring device, characterized in that include: A bracket (100) and a distance measuring detection element (210); A measuring plate assembly, the measuring plate assembly comprising a first measuring plate (310), a second measuring plate (320) and a third measuring plate (330), a pressure detecting element (220) being sandwiched between the first measuring plate (310) and the bracket (100), a battery (10) being able to be placed on a side of the first measuring plate (310) away from the pressure detecting element (220), and the battery (10) being able to be sandwiched between the first measuring plate (310) and the second measuring plate (320), The second measuring plate (320) and the third measuring plate (330) are both movably connected to the bracket (100); the second measuring plate (320) and the third measuring plate (330) are respectively capable of reciprocating along the expansion direction of the battery (10); the third measuring plate (330) is located on a side of the second measuring plate (320) away from the battery (10); and the distance measuring detection element (210) is used to measure the distance between the second measuring plate (320) and the third measuring plate (330); an elastic element (400), two ends of the elastic element (400) being respectively connected to the second measuring plate (320) and the third measuring plate (330); A positioning element (500), wherein the positioning element (500) is arranged on the bracket (100), and the positioning element (500) can be selectively detachably connected to the second measuring plate (320) or the third measuring plate (330), and by adjusting the connection relationship between the positioning element (500) and the second measuring plate (320) and the third measuring plate (330), it is possible to switch between two measurement modes: measuring the expansion force of the battery (10) and measuring the expansion amount of the battery (10).

2. The battery measuring device according to claim 1, characterized in that: When measuring the expansion force of the battery (10), the positioning element (500) is connected to the second measuring plate (320) so that the second measuring plate (320) moves or remains stationary relative to the bracket (100).

3. The battery measuring device according to claim 1, characterized in that: When measuring the expansion amount of the battery (10), the positioning element (500) is connected to the third measuring plate (330) so that the third measuring plate (330) moves or remains stationary relative to the bracket (100).

4. The battery measuring device according to claim 3, characterized in that: The third measuring plate (330) comprises a plate body (331) and a movable part (332), wherein the plate body (331) is provided with a through hole (3311), the movable part (332) is movably connected to the plate body (331), and the movable part (332) can be covered on the through hole (3311), one end of the positioning element (500) is connected to the bracket (100), and the other end of the positioning element (500) is detachably connected to the plate body (331) via the movable part (332).

5. The battery measuring device according to claim 4, characterized in that: The plate body (331) is provided with a slide groove (3312), the through hole (3311) is opened at the bottom of the slide groove (3312), and the movable member (332) is slidably matched with the slide groove (3312).

6. The battery measuring device according to claim 4, characterized in that: The third measuring plate (330) further comprises a first limiting portion and a second limiting portion, wherein the first limiting portion is arranged on the plate body (331), and the second limiting portion is arranged on the movable member (332), and the first limiting portion and the second limiting portion are detachably connected to each other so that the movable member (332) is movably connected to the plate body (331).

7. The battery measuring device according to claim 4, characterized in that: The positioning element (500) is provided with an external thread, the second measuring plate (320) is provided with a first threaded hole (321), the movable member (332) is provided with a second threaded hole (3321), and the external thread is selectively threadedly matched with the first threaded hole (321) or the second threaded hole (3321).

8. The battery measuring device according to claim 1, characterized in that: The distance measuring detection element (210) is a displacement sensor, comprising a sensing element and a transmitting element, one of the sensing element and the transmitting element being arranged on the second measuring plate (320), and the other being arranged on the third measuring plate (330), and the sensing element and the transmitting element being arranged opposite to each other.

9. The battery measuring device according to claim 1, characterized in that: The distance measuring detection element (210) is a ruler, one end of which is fixedly connected to one of the second measuring plate (320) and the third measuring plate (330), and the other end of which is movably connected to the other one.

10. The battery measuring device according to claim 1, characterized in that: The bracket (100) comprises a first support plate (110), a second support plate (120) and a guide rod (130); the first support plate (110) and the second support plate (120) are arranged opposite to each other, and the first support plate (110) and the second support plate (120) are connected via the guide rod (130); the second measuring plate (320) and the third measuring plate (330) are slidably mounted on the guide rod (130).

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