Battery charge and discharge measurement device and method suitable for different sizes and specifications

Abstract

The present invention discloses a battery charge and discharge measurement device and method suitable for different sizes and specifications, the device includes a base, a column arranged on the base, a crossbeam that can move up and down along the column, a clamping mechanism for clamping the battery to be tested, a connector for connecting the wire and the battery to be tested, and a top member for pressing the connector against the surface of the battery to be tested. The measuring device of the present invention has a certain versatility, and its width and height can be arbitrarily adjusted within a certain range, and can cover almost all sizes of square lithium-ion batteries currently on the market; using the measuring device of the present invention, the battery still maintains good heat dissipation conditions after clamping, which is convenient for carrying out charge and discharge test measurements of lithium-ion batteries in a constant temperature environment; the battery pole ear contact position is designed with a temperature measurement element quick-insert structure, which is easy to accurately measure the temperature changes in the battery pole area during the charge and discharge process.

Description

Technical Field

[0001] The present invention belongs to the field of battery testing technology, and in particular to the field of lithium-ion batteries currently used on a large scale in the market, and specifically to a battery charge and discharge measurement device and method suitable for batteries of different sizes and specifications. Background Art

[0002] With the rapid development and promotion of the electric vehicle industry, OEMs have put forward higher requirements for the energy density, safety, cost and battery management technology of power lithium-ion batteries. Square lithium-ion batteries have the advantages of simple structure, high energy density, good safety, easy grouping and expansion, high battery pack energy efficiency and simple management system, and have gradually become one of the most important energy storage components of electric vehicle (especially electric commercial vehicle) power systems. At present, there are many sizes and models of square lithium-ion batteries used on a large scale. According to the electric vehicle square battery size standard "GB / T 34013-2017 Specifications and Dimensions of Power Storage Batteries for Electric Vehicles" formulated by my country in 2017, there are still more than 100 sizes and models of square lithium-ion batteries currently used in the market, and universal charging and discharging test fixtures for square lithium-ion batteries are relatively rare in the current market.

[0003] During the formation and capacity division stages before power lithium-ion batteries leave the factory, as well as the design and selection stages before power batteries are assembled, it is necessary to conduct necessary charge and discharge test measurements on lithium-ion batteries to obtain data indicators such as battery capacity, rate performance, high and low temperature performance, and heat generation rate. At the same time, when various research institutions conduct basic research related to lithium-ion batteries, battery charge and discharge tests are often a must-do basic experiment. When conducting lithium-ion battery charge and discharge tests, a special test fixture is usually used to connect the battery to the charge and discharge test equipment to further measure the three basic parameters of the lithium-ion battery: voltage, current, and temperature.

[0004] At present, the connection of square lithium-ion battery cells for vehicles is rarely connected by locking bolts (due to its large grouping space and contact resistance, and easy loosening during vibration, etc.), and most of them use aluminum bars or copper bars to weld lithium-ion battery poles to form modules. The square lithium-ion battery poles are generally less than 5 mm. When conducting the current charge and discharge test, it is necessary to weld busbars (nickel sheets or copper sheets) on the battery poles so that they can be connected to the charging and discharging equipment using alligator clips. Obviously, when the above method is used to measure the charge and discharge of lithium-ion batteries, the welded busbars cause irreversible damage to the battery and are difficult to remove, and the tested batteries are difficult to use in subsequent groups; at the same time, the busbar welding usually adopts laser welding, which has high technical requirements and certain safety risks, and requires special welding equipment and professional technicians to complete. Therefore, it is urgent to design a charge and discharge test fixture suitable for square lithium-ion batteries to serve battery factories, vehicle manufacturers and research institutions to quickly carry out square lithium-ion battery charge and discharge tests.

[0005] In addition, since the shape and position of the tabs of lithium-ion batteries have an extremely important influence on the current distribution, heat generation and heat dissipation inside them, and due to the large tab resistance and pole welding resistance, the battery pole may also become a high-temperature area during the battery charging and discharging process. Therefore, when conducting square lithium-ion battery charging and discharging experiments, it is usually necessary to test the temperature of the positive and negative pole areas, so as to complete the optimal design of the pole position and size when designing the battery structure. However, the market still lacks experimental devices for online measurement of the pole temperature of square lithium-ion batteries, and directly pasting temperature measuring elements (such as thermal resistors, etc.) at the pole position has technical defects such as large measurement errors (caused by large contact thermal resistance), poor reliability (such as: the temperature measuring element is prone to fall due to heat during the measurement process, etc.), and poor safety. Therefore, it is urgent to integrate the online measurement design of the pole temperature into the square lithium-ion battery charging and discharging measurement fixture to serve the design and optimization of large-scale square lithium-ion battery structures for electric vehicles. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a battery charge and discharge measurement device and method suitable for different sizes and specifications, especially suitable for square lithium-ion batteries currently used on a large scale in the market, to solve the problems of existing square lithium-ion batteries requiring welding of busbars after charge and discharge tests, causing damage to the battery, complex processes and lack of battery pole temperature measurement.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A battery charge and discharge measuring device suitable for different sizes and specifications, comprising a base, a column arranged on the base, a beam capable of moving up and down along the column, a clamping mechanism for clamping a battery to be tested, a connector for connecting a wire and the battery to be tested, and an extrusion member for extruding the connector onto the surface of the battery to be tested;

[0009] There are at least two columns, at least one of which is a movable column that can move along the base; the crossbeam is a length-adjustable structure;

[0010] The clamping mechanism comprises a connecting portion for connecting with the two side columns and a telescopic member with adjustable length arranged between the two connecting portions;

[0011] The extrusion top piece is connected to the cross beam, and the position of the extrusion top piece on the cross beam is adjustable;

[0012] The connecting piece is provided with a temperature measuring element.

[0013] Specifically, the crossbeam is provided with a first through hole for the column to pass through, and the connection between the crossbeam and the column is provided with a longitudinal locking piece for fixing the longitudinal position of the crossbeam;

[0014] The longitudinal locking member includes an opening adjustment member and a spring. The crossbeam is provided with a cavity for placing the spring. The opening adjustment member is connected to the spring and can move along the expansion and contraction direction of the spring. The opening adjustment member is provided with a first tooth groove, and the side of the column is provided with a second tooth groove meshing with the first tooth groove.

[0015] Specifically, a detachable cover plate is provided on the cavity of the crossbeam, and a limit slot for movement of the opening adjusting member is provided on the cover plate; and a third tooth groove capable of meshing with the first tooth groove is provided on the wall of the first through hole.

[0016] Specifically, the crossbeam is formed by sequentially splicing three short crossbeams, at least one short crossbeam is provided with a dovetail groove, and the other two short crossbeams are inserted into the dovetail groove; adjacent short crossbeams are fixed by transverse locking members.

[0017] More specifically, the three short cross beams are each provided with a second through hole for the extrusion top piece to pass through, the three short cross beams are each provided with a dovetail groove, the transverse locking piece is a fixed block matching the shape of the dovetail groove, and the fixed block is provided with a third through hole for the extrusion top piece to pass through.

[0018] Specifically, the two connecting parts of the clamping mechanism have the same structure. The connecting part includes a protrusion fixed on the side of the column, a pin and an L-shaped connecting piece. One end of the L-shaped connecting piece is provided with a first socket for the protrusion to pass through, and the protrusion is provided with a second socket for the pin to pass through; the two ends of the telescopic member are connected to the other end of the L-shaped connecting piece in the two connecting parts.

[0019] Specifically, the connecting piece is provided with a groove for accommodating the end of the extrusion top piece, and pole ears are respectively provided on both sides of the connecting piece, wherein a slot for accommodating the temperature measuring element is provided on one pole ear.

[0020] Specifically, the extruded top piece is a bolt, and the top of the bolt is coated with an insulating material layer.

[0021] Specifically, there are two columns, one of which is fixed on the base, and the other is inserted in the slide groove of the base; the column in the slide groove adjusts the distance between the two columns by moving in the slide groove.

[0022] The present invention also discloses a battery charge and discharge measurement method applicable to batteries of different sizes and specifications, which is measured using the battery charge and discharge measurement device of the present invention. The method specifically includes:

[0023] Step 1, pull open the movable column, put the battery to be tested into the clamping mechanism, and clamp the battery to be tested;

[0024] Step 2, adjust the position of the crossbeam on the column so that the crossbeam is located 3 to 5 mm away from the end face of the electrode column of the battery to be tested, and fix the crossbeam;

[0025] Step 3, adjusting the position of the extrusion piece so that the ends of the extrusion piece are aligned with the positive and negative electrode columns of the battery to be tested; placing the connector above the positive and negative electrode columns of the battery to be tested, and adjusting the extrusion piece so that the connector is squeezed onto the positive and negative electrode columns of the battery to be tested;

[0026] Step 4: Connect one side of the connector to the voltage and current test wires of the battery charging and discharging equipment to record the battery terminal voltage and test current in real time; place a temperature measuring element on the other side of the connector, connect the temperature measuring element to the data acquisition card, and record the battery pole temperature data.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The width and height of the measuring device of the present invention can be adjusted arbitrarily within a certain range, and can cover almost all sizes of square lithium-ion batteries currently on the market (see national standard "GB / T 34013-2017").

[0029] (2) By using the measuring device of the present invention, the battery can still maintain good heat dissipation conditions after being clamped, which is convenient for carrying out charging and discharging test measurements of lithium-ion batteries in a constant temperature environment.

[0030] (3) The contact position of the lithium-ion battery tab is designed with a temperature measurement element quick-insert structure, which makes it easy to measure the temperature changes in the battery pole area during charging and discharging.

[0031] (4) The measuring device of the present invention is easy to disassemble and simple to operate.

[0032] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of a device equipped with a clamping mechanism according to an embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of the device without a clamping mechanism according to an embodiment of the present invention.

[0035] Figure 3 for Figure 1 A partial enlarged view of the longitudinal locking piece at position I when it is opened.

[0036] Figure 4 It is a schematic structural diagram of an opening adjustment member according to an embodiment of the present invention.

[0037] Figure 5 This is a schematic diagram of the installation of the opening adjustment member recorded in an embodiment of the present invention on one side of the beam.

[0038] Figure 6 This is an exploded view of the connection between the clamping mechanism recorded in an embodiment of the present invention and one side column.

[0039] Figure 7 This is a schematic diagram of a transverse locking member in a crossbeam according to an embodiment of the present invention.

[0040] Figure 8 It is a schematic structural diagram of a transverse locking member according to an embodiment of the present invention.

[0041] Fig. 9 A top view (1-1) and a front view (1-2) of a connector according to an embodiment of the present invention.

[0042] Fig.10 The top view (1-1) and the front view (1-2) of the crossbeam in the stretched state recorded in the embodiment of the present invention.

[0043] Fig.11 The present invention discloses a top view (1-1) and a front view (1-2) of a beam in a combined state according to an embodiment of the present invention.

[0044] Fig.12 The structure diagram of the device after the battery to be tested is installed.

[0045] The symbols in the figure represent:

[0046] 1-base, 2-column, 3-crossbeam, 4-clamping mechanism, 5-connecting piece, 6-top extrusion piece, 7-longitudinal locking piece, 8-lateral locking piece, 9-battery to be tested;

[0047] 21 - second tooth groove;

[0048] 31-cavity, 32-cover plate, 33-limiting slot, 34-third tooth slot, 35-dovetail slot, 36-second through hole;

[0049] 41-connecting part, 42-telescopic member;

[0050] 411-bump, 412-pin, 413-L-shaped connector, 414-first plug hole, 415-second plug hole;

[0051] 51-groove, 52-ear;

[0052] 71-opening adjustment member, 72-spring; 711-first tooth groove;

[0053] 81 - the third through hole.

[0054] The specific contents of the present invention are further explained in detail below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0055] The specific implementation methods of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0056] In the present invention, unless otherwise specified, directional terms such as “upper” and “lower” are generally defined based on the drawings of the corresponding figures, and “inside” and “outside” refer to the inside and outside of the corresponding component outline.

[0057] Example 1

[0058] like Figure 1 As shown, this embodiment discloses a battery charge and discharge measurement device suitable for different sizes and specifications, which includes a base 1, a column 2 arranged on the base 1, a beam 3 that can move up and down along the column 2, a clamping mechanism 4 for clamping a battery 9 to be tested, a connector 5 for connecting a wire (or a temperature data acquisition line) and the battery 9 to be tested, and a top extrusion member 6 for extruding the connector 5 onto the top surface of the pole of the battery 9 to be tested.

[0059] In this embodiment, two columns 2 are provided, one of which is a movable column that can move along the base 1, so that the distance between the two columns 2 is adjustable. Specifically, in this embodiment, a slide groove (not shown in the figure) is provided on the base 1, and one of the columns is inserted into the slide groove of the base 1. The column 2 in the slide groove moves in the slide groove to adjust the distance between the two columns 2.

[0060] The base 1 is required to be smooth during processing. The material of the base 1 is aluminum alloy or other alloy materials or polymers with a certain strength. It can be sprayed or coated with thermal conductive insulating materials according to user needs. When processing the base 1, ensure that the base 1 is smooth and the friction is as small as possible to facilitate the movement of the movable column. The material of the column 2 and the crossbeam 3 is also aluminum alloy or other alloy materials or polymers with a certain strength. It can be sprayed or coated with thermal conductive insulating materials according to user needs.

[0061] At the same time, since both ends of the beam 3 are connected to the column 2, the beam 3 is set to a length-adjustable structure. Specifically, in the present embodiment, the beam 3 is formed by three short beams being spliced ​​in sequence, at least one short beam is provided with a dovetail groove 35, and the other two short beams are inserted into the dovetail groove 35, that is, the beam as a whole is a pull-out structure. The length of the middle short beam is equal to the sum of the lengths of the two sides, and the lengths of the two sides are equal. The short beams at both ends can be completely covered on the middle one after being tightened. Adjacent short beams are fixed by transverse locking members 8. When the length of the beam 3 is adjusted to a suitable position, the beam 3 is fixed by the transverse locking members 8. Figure 2 shown.

[0062] Specifically, such as Figure 7 , Figure 8 As shown, the transverse locking member 8 is a fixed block that matches the shape of the dovetail groove 35. The longitudinal section of the fixed block is an I-shaped, and the material of the fixed block is an aluminum alloy or other alloy materials or polymers with a certain strength. The three short cross beams are all provided with a second through hole 36 for the top extrusion member 6 to pass through. In this embodiment, the shape of the second through hole 36 is a waist-shaped groove structure, such as Figure 7 The second through holes 36 on the middle short cross beam are arranged at both ends thereof, and the second through holes 36 on the short cross beams on both sides penetrate to the longitudinal locking member 7 along the length direction of the short cross beam.

[0063] The three short beams are all provided with dovetail grooves 35, and the transverse locking member 8 is provided with a third through hole 81 for the top extrusion member 6 to pass through. The transverse locking member 8 is installed in the dovetail groove 35 of the upper short beam at the overlap of two adjacent short beams. The top extrusion member 6 passes through the transverse locking member 8 and the overlap of two adjacent short beams to fix the three together.

[0064] After the cross beam 3 can move up and down along the column 2, the position of the cross beam needs to be fixed. Specifically, in this embodiment, a first through hole (not shown in the figure) for the column 2 to pass through is provided on the cross beam 3, and a longitudinal locking member 7 for fixing the longitudinal position of the cross beam 3 is provided at the connection between the cross beam 3 and the column 2. Figure 1 shown.

[0065] like Figures 3 to 5 As shown, the longitudinal locking member 7 of this embodiment includes an opening adjustment member 71 and a spring 72. A cavity 31 for placing the spring 72 is provided on the crossbeam 3. In this embodiment, a groove is provided at both ends of the crossbeam 3 and a detachable cover plate 32 is installed on the groove to form the cavity 31.

[0066] The opening adjusting member 71 is connected to the spring 72, and a limit slot 33 is provided on the cover plate 32 for the opening adjusting member 71 to move, so that the longitudinal movement of the opening adjusting member 71 is limited and the opening adjusting member 71 can only move along the expansion and contraction direction of the spring 72. A first tooth groove 711 is provided on the opening adjusting member 71, and a first tooth groove 711 is provided on the side of the column 2 (i.e. Figure 1 The upper part of the middle column 2 is provided with a second tooth groove 21 meshing with the first tooth groove 711 , and the length of the second tooth groove 21 is determined according to the longitudinal force of the cross beam 3 (ie, the pressure that the extrusion top piece 6 can withstand).

[0067] When the position of the beam 3 needs to be adjusted, the opening adjustment member 71 is pushed to squeeze the spring 72 so that the first tooth groove 711 and the second tooth groove 21 are opened. After the beam 3 moves to a suitable position, the opening adjustment member 71 is released, and the spring 72 rebounds so that the first tooth groove 711 re-engages with the second tooth groove 21 on the column 2, thereby fixing the beam 3.

[0068] In this embodiment, Figure 4 As shown, the opening adjustment member 71 is a T-shaped member, wherein the large end is provided with a first tooth groove and is disposed in the cavity 31 , and the small end extends out of the cavity 31 through a limiting slot 33 .

[0069] In this embodiment, multiple springs 72 may be arranged in parallel in the cavity 31, such as Fig.10 Fig.11 as shown to improve stability.

[0070] In addition, a third tooth groove 34 that can mesh with the first tooth groove 711 can be provided at the wall of the first through hole on the cross beam. When the column is not inserted, the spring 72 pushes the top of the opening adjustment member 71, so that the first tooth groove 711 and the second tooth groove 21 are plugged together to form an integral structure. Figure 3 shown.

[0071] Preferably, insulating material is added inside the longitudinal locking member 7 to prevent the battery from leaking.

[0072] During installation, first install the transverse locking member 8, and directly insert the transverse locking member 8 into the dovetail groove of the crossbeam, and the transverse locking member 8 can slide in the dovetail groove 35 of the crossbeam. Then install the spring 72 in the longitudinal locking member 7 and the cover plate 32 on the crossbeam 3.

[0073] In this embodiment, the clamping mechanism 4 includes a connecting portion 41 for connecting to the two side columns 2 and a telescopic member 42 with adjustable length disposed between the two connecting portions 41 .

[0074] The two connecting parts 41 of the clamping mechanism 4 have the same structure.

[0075] Specifically, Figure 6 As shown, the connecting portion 41 includes a protrusion 411 fixed to the side of the column 2, a latch 412 and an L-shaped connector 413. In this embodiment, the latch 412 is a T-shaped structure. A first plug hole 414 is provided at one end of the L-shaped connector 413 for the protrusion 411 to pass through, and a second plug hole 415 is provided on the protrusion 411 for the latch 412 to pass through. After the protrusion 411 passes through the first plug hole 414, the latch 412 is inserted into the second plug hole 415 on the protrusion to fix the protrusion 411 and the L-shaped connector 413. In addition, one end of the L-shaped connector 413 connected to the telescopic member 42 is formed by two rods, which can reduce the contact area between the battery 9 to be tested and the L-shaped connector 413, so that the battery 9 to be tested maintains a good heat dissipation condition.

[0076] The two ends of the telescopic member 42 are connected to the other ends of the L-shaped connecting members 413 in the two connecting parts 41. The telescopic member 42 in this embodiment is a spring, and the two ends of the spring are connected to the L-shaped connecting member 413 through hooks.

[0077] The clamping mechanism 4 of this embodiment can not only support the battery 9 to be tested, but also fix the battery 9 to be tested in a transverse manner.

[0078] The material of the L-shaped connector 413 is aluminum alloy or other alloy materials or polymers with a certain strength, and can be sprayed or coated with thermally conductive insulating materials according to user needs.

[0079] The connector 5 of this embodiment is placed on the top surface of the pole of the battery 9 to be tested. Fig. 9 As shown, a groove 51 for placing the end of the extrusion top member 6 is provided on the connector 5, and the connector 5 is a basin-shaped structure as a whole. The connector 5 is a copper stamping with a certain thickness. The bottom surface is coated with a good conductive plastic material to reduce the contact resistance.

[0080] Preferably, the upper and lower surfaces of the connector 5 are coated with a plastic conductive material to improve its conductive properties.

[0081] A temperature measuring element is also provided on the connector 5. Specifically, tabs 52 are provided on both sides of the connector 5. One tab is used to connect a wire, and a bolt (or pliers) is used to fix the wire used to test current and voltage. The other tab is used to place the temperature measuring element, and a slot (not shown in the figure) is provided on the tab 52 where the temperature measuring element is placed. This quick-insert structure is convenient for placing the temperature measuring element and is easy to measure the temperature change of the battery pole area during the charging and discharging process, so as to obtain the temperature of the positive and negative pole areas in real time.

[0082] A plastic heat-conducting material is applied in the card slot to ensure good heat conduction between the battery pole and the temperature measuring element. In this embodiment, the temperature measuring element is a thermal resistor, a thermocouple, and the like.

[0083] The extrusion piece 6 of this embodiment is connected to the cross beam 3, and the position of the extrusion piece 6 on the cross beam 3 can be adjusted by sliding the transverse locking piece 8. The extrusion piece 6 is used to squeeze the connecting piece 5 against the top surface of the pole of the battery 9 to be tested.

[0084] Specifically, the extrusion top piece 6 of this embodiment is a bolt, the bolt material is copper, and the top of the bolt is covered with an "I" shaped knob made of insulating and heat-insulating material (such as plastic, rubber, etc.) to save effort, insulate and be safe when manually adjusting the bolt.

[0085] The device of the present invention can replace the clamping mechanism 4 according to the thickness of the battery 9 to be tested, and the width and height of the clamping mechanism 4 cover all square lithium-ion battery models (refer to the national standard "GB / T 34013-2017").

[0086] Example 2

[0087] This embodiment discloses a battery charge and discharge measurement method applicable to different sizes and specifications. This embodiment uses the battery charge and discharge measurement device recorded in the embodiment to perform measurement. The method specifically includes:

[0088] Step 1, pull open the movable column 2, put the battery 9 to be tested into the clamping mechanism 4, and make it clamp the battery 9 to be tested;

[0089] Step 2, adjust the position of the cross beam 3 on the column 2 so that the cross beam 3 is located 3-5 mm away from the end surface of the electrode column of the battery to be tested 9, and fix the cross beam 3.

[0090] Specifically, the opening adjustment member 71 is pushed to squeeze the spring 72, so that the first tooth groove 711 and the second tooth groove 21 are opened, and after the cross beam 3 moves to a suitable position, the opening adjustment member 71 is released, and the spring 72 rebounds so that the first tooth groove 711 and the second tooth groove on the column 2 are re-engaged to fix the position of the cross beam 3. The present invention can also be fixed by other structures, and the longitudinal locking member 7 of this embodiment is preferred.

[0091] Step 3, adjust the position of the extrusion top piece 6 so that the ends of the extrusion top piece 6 are aligned with the positive and negative electrode poles of the battery to be tested; specifically, slide the extrusion top piece 6 horizontally so that the ends of the extrusion top piece 6 are aligned with the positive and negative electrode poles of the battery to be tested.

[0092] Place the connector 5 on the top surface of the positive and negative electrode poles of the battery 9 to be tested, fine-tune the top extrusion piece 6, and tighten the top extrusion piece 6 so that the connector 5 is pressed against the top surface of the positive and negative electrode poles of the battery 9 to be tested, so that the bottom of the connector 5 is in close contact with the positive and negative electrode poles of the battery 9 to be tested.

[0093] Step 4, connect the pole ear on one side of the connector 5 to the voltage and current test wires of the battery charging and discharging equipment, and record the battery terminal voltage and test current in real time; place a temperature measuring element in the card slot of the pole ear on the other side, and connect the temperature measuring element to the data acquisition card using a temperature data acquisition line to automatically record the battery pole temperature data.

[0094] It should be noted that, in addition to being arranged at the pole ear of the above-mentioned connector 5, the temperature measuring element can also be set at other positions of the battery, so as to accurately measure and record the terminal voltage, current, and temperature at typical positions during the charging and discharging process of the square lithium-ion battery.

[0095] It should be noted that the device and method of the present invention are not limited to square lithium-ion batteries, but can also be applied to batteries with other structural features that match the device of the present application.

[0096] In the above description, unless otherwise clearly specified and limited, the terms "set", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a direct connection or an indirect connection, etc. For ordinary technicians in this field, the specific meanings of the above terms in this technical solution can be understood according to specific circumstances.

[0097] The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. Applicable to battery charge and discharge measurement devices of different sizes, characterized by: The device comprises a base (1), a column (2) arranged on the base (1), a crossbeam (3) capable of moving up and down along the column (2), a clamping mechanism (4) for clamping a battery to be tested (9), a connecting piece (5) for connecting a wire and the battery to be tested (9), and a pressing piece (6) for pressing the connecting piece (5) against the surface of the battery to be tested (9); At least two columns (2) are provided, at least one of which is a movable column that can move along the base (1); the crossbeam (3) is a length-adjustable structure; The clamping mechanism (4) comprises a connecting portion (41) for connecting to the two side columns (2) and a telescopic member (42) with adjustable length arranged between the two connecting portions (41); The extrusion top piece (6) is connected to the cross beam (3), and the position of the extrusion top piece (6) on the cross beam (3) is adjustable; The connecting piece (5) is provided with a temperature measuring element; The crossbeam (3) is provided with a first through hole for the column (2) to pass through, and a longitudinal locking piece (7) for fixing the longitudinal position of the crossbeam (3) is provided at the connection between the crossbeam (3) and the column (2); The longitudinal locking member (7) comprises an opening adjustment member (71) and a spring (72); the crossbeam (3) is provided with a cavity (31) for accommodating the spring (72); the opening adjustment member (71) is connected to the spring (72), and the opening adjustment member (71) is movable along the expansion and contraction direction of the spring (72); the opening adjustment member (71) is provided with a first tooth groove (711); and the side surface of the column (2) is provided with a second tooth groove (21) meshing with the first tooth groove (711); The crossbeam (3) is formed by sequentially splicing three short crossbeams, at least one of which is provided with a dovetail groove (35), and the other two short crossbeams are inserted into the dovetail groove (35); adjacent short crossbeams are fixed by transverse locking members (8).

2. The battery charge and discharge measurement device applicable to different sizes as claimed in claim 1, characterized in that: A detachable cover plate (32) is provided on the cavity (31) of the crossbeam, and a limit slot (33) for the opening adjustment member (71) to move is provided on the cover plate (32); a third tooth slot (34) capable of meshing with the first tooth slot (711) is provided on the wall of the first through hole.

3. The battery charge and discharge measurement device applicable to different sizes as claimed in claim 1, characterized in that: The three short cross beams are each provided with a second through hole (36) for the extrusion top piece (6) to pass through, and the three short cross beams are each provided with a dovetail groove (35). The transverse locking piece (8) is a fixed block having a shape matching that of the dovetail groove (35), and the fixed block is provided with a third through hole (81) for the extrusion top piece (6) to pass through.

4. The battery charge and discharge measurement device applicable to different sizes as claimed in claim 1, characterized in that: The two connecting parts (41) of the clamping mechanism (4) have the same structure. The connecting part (41) comprises a protrusion (411) fixed to the side of the column (2), a latch (412) and an L-shaped connecting piece (413). One end of the L-shaped connecting piece (413) is provided with a first plug hole (414) for the protrusion (411) to pass through, and the protrusion (411) is provided with a second plug hole (415) for the latch (412) to pass through. The two ends of the telescopic member (42) are connected to the other end of the L-shaped connecting piece (413) in the two connecting parts.

5. The battery charge and discharge measurement device applicable to different sizes as claimed in claim 1, characterized in that: The connecting piece (5) is provided with a groove (51) for accommodating the end of the extrusion piece (6), and pole ears (52) are respectively provided on both sides of the connecting piece (5), wherein one pole ear (52) is provided with a slot for accommodating a temperature measuring element.

6. The battery charge and discharge measurement device applicable to different sizes as claimed in claim 1, characterized in that: The extruded top piece (6) is a bolt, and the top of the bolt is coated with a layer of insulating material.

7. The battery charge and discharge measurement device applicable to different sizes as claimed in claim 1, characterized in that: There are two columns (2), one of which is fixed on the base (1) and the other is inserted into a slide groove of the base (1); the column (2) in the slide groove is moved in the slide groove to adjust the distance between the two columns (2).

8. A method for measuring the charge and discharge of batteries of different sizes, characterized in that: The battery charge and discharge measurement device according to any one of claims 1 to 7 is used for measurement, and the method specifically comprises: Step 1, pull open the movable column (2), place the battery to be tested (9) into the clamping mechanism (4), and clamp the battery to be tested (9); Step 2, adjusting the position of the crossbeam (3) on the column (2) so that the crossbeam (3) is located 3 to 5 mm away from the end surface of the electrode column of the battery to be tested (9), and fixing the crossbeam (3); Step 3, adjusting the position of the top extrusion member (6) so that the ends of the top extrusion member (6) are aligned with the positive and negative electrode columns of the battery to be tested; placing the connecting member (5) above the positive and negative electrode columns of the battery to be tested (9), and adjusting the top extrusion member (6) so that the connecting member (5) is pressed against the positive and negative electrode columns of the battery to be tested (9); Step 4, connecting one side of the connector (5) to the voltage and current test wires of the battery charging and discharging equipment, and recording the battery terminal voltage and test current in real time; placing a temperature measuring element on the other side of the connector (5), connecting the temperature measuring element to a data acquisition card, and recording the battery pole temperature data.

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