Cylindrical lithium battery capacity grading detection device

Abstract

The utility model relates to the field of lithium battery performance testing, in particular to a cylindrical lithium battery capacity grading detection device, which comprises a detection table, a constant current load, a connecting plate and a comparison circuit, the constant current load is used for discharging a cylindrical lithium battery pack, and the capacity grading detection device can detect the capacity of the cylindrical lithium battery pack by observing the voltage change of the cylindrical lithium battery pack and then through the discharging time. And calculating and detecting the capacity of the cylindrical lithium battery pack. A comparison circuit is designed, a first reference voltage and a second reference voltage are set in advance, the first reference voltage is the optimal working voltage of a preset use scene, the second reference voltage is an insufficient voltage, and alarming and timing are carried out when the voltage of the cylindrical lithium battery pack is lower than the first reference voltage and the second reference voltage. And the capacity and the total capacity of the lithium battery pack in the optimal working range can be conveniently and accurately detected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lithium battery performance test, specifically relates to a cylindrical lithium battery capacity grading detection device. BACKGROUND

[0002] After the lithium battery is finished in the production workshop, the battery capacity will generally have slight difference, so it is necessary to screen qualified batteries through capacity test. In addition, the cylindrical lithium battery generally needs to be composed of a plurality of cylindrical lithium batteries to form a battery pack during use. Therefore, even if the capacity difference between single cylindrical lithium batteries is very small, the capacity difference of each battery pack composed of a plurality of cylindrical lithium batteries may be large.

[0003] And the common means at present is to use the capacity grading cabinet to detect, but the general capacity grading cabinet is not suitable for detecting the cylindrical lithium battery pack. In particular, the optimal working voltage of the battery pack in different use scenarios is also different. With the power consumption of the battery pack, the capacity of the battery pack decreases, and the voltage of the battery pack generally also decreases.

[0004] And the capacity grading detection at present lacks the detection of the battery capacity under the optimal working voltage in various use scenarios. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a cylindrical lithium battery capacity grading detection device to solve the technical problem that the optimal working voltage and the capacity change relationship of the battery pack in different use scenarios are not detected in the prior art.

[0006] Based on the above purpose, the utility model provides a cylindrical lithium battery capacity grading detection device, which comprises a detection table, a constant current load is arranged on the detection table and is used for discharging the cylindrical lithium battery pack, and the capacity grading detection device comprises:

[0007] A connecting plate capable of being connected with the cylindrical lithium battery pack, and the constant current load is connected with the connecting plate through an outer lead wire;

[0008] A comparison circuit arranged in the detection table, the comparison circuit is connected with the connecting plate, and the comparison circuit comprises a comparator one and a comparator two, which are respectively used for comparing the voltage of the cylindrical lithium battery pack with a reference voltage one and a reference voltage two;

[0009] A voltage tester connected with the connecting plate, which is used for detecting and displaying the voltage of the cylindrical lithium battery pack in real time;

[0010] A first alarm and a second alarm for alarm;

[0011] A first timer and a second timer for timing;

[0012] The first alarm and the first timer are connected with a comparator one, and the second alarm and the second timer are connected with a comparator two.

[0013] Further, the reference voltage one and the reference voltage two are set in advance, wherein the reference voltage one is the optimal working voltage of the preset use scene, and the reference voltage two is the power shortage voltage.

[0014] Further, the first alarm alarms when the voltage of the cylindrical lithium battery pack is lower than the reference voltage one, and the first timer is used for recording the time consumed for the voltage of the cylindrical lithium battery pack to decrease to the reference voltage one.

[0015] Further, the second alarm alarms when the voltage of the cylindrical lithium battery pack is lower than the reference voltage two, and the second timer is used for recording the time consumed for the voltage of the cylindrical lithium battery pack to decrease to the reference voltage two.

[0016] Further, the lower end of the connecting plate is provided with a connecting plug matched with the joint of the cylindrical lithium battery pack, the connecting plate is fixedly connected to the top of the telescopic plate, the telescopic plate is slidingly connected to the fixed seat, and the fixed seat is fixedly connected to the detection table.

[0017] Further, the connecting plate and the telescopic plate are provided with an inner lead wire connected with the connecting plug, the end of the inner lead wire is fixedly connected with a connecting rod, the telescopic plate is further movably connected with a movable connecting piece, the movable connecting piece is movably connected with the connecting rod, and the rear end of the movable connecting piece is connected with a spring.

[0018] Further, the fixed seat is provided with a connecting piece matched with the movable connecting piece, and the connecting piece is connected with an outer lead wire.

[0019] Further, the fixed seat is slidingly connected with a buckle, and the telescopic plate is provided with a buckle groove matched with the buckle.

[0020] The cylindrical lithium battery pack is discharged by using a constant current load, the capacity of the cylindrical lithium battery pack is calculated by observing the voltage change of the cylindrical lithium battery pack and the discharging time.

[0021] 2、Design a comparison circuit, set the reference voltage one and the reference voltage two in advance, the reference voltage one is the optimal working voltage of the preset use scene, and the reference voltage two is the power shortage voltage, and alarm and timing are performed when the voltage of the cylindrical lithium battery pack is lower than the reference voltage one and the reference voltage two respectively.

[0022] 3. The connecting plate is designed as a connecting piece of the cylindrical lithium battery pack, and the connecting plate is connected with the cylindrical lithium battery pack, and then the connecting plate is connected with the external lead wire through the movable connecting piece and the connecting piece, so that the stability of the circuit connection is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Figure 1 It is a structural principle diagram of the device of the present application.

[0025] Figure 2 It is a front view of the device of the present application.

[0026] Figure 3 It is a top view of the device of the present application.

[0027] Figure 4 It is a schematic diagram of the internal structure of the middle fixed seat and the telescopic plate of the device of the present application.

[0028] Figure 5 It is a circuit principle diagram of the voltage comparison circuit in the present application.

[0029] In the figure, the marks are: 01, cylindrical lithium battery pack, 101, detection table, 102, constant current load, 103, fixed seat, 104, connecting plate, 105, external lead wire, 106, voltage tester, 107, first alarm, 108, first timer, 109, second alarm, 110, second timer, 111, connecting plug, 112, buckle, 113, telescopic plate, 114, internal lead wire, 115, buckle groove, 116, movable connecting piece, 117, connecting rod, 118, spring, 119, connecting piece. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be further described in detail in combination with specific embodiments.

[0031] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the present application should be understood as the usual meaning understood by those skilled in the art to which the present application belongs. The "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] The first aspect of the present application, as shown in Figure 1 , Figure 3 and Figure 5 , the optimal working voltage of the battery pack is different in different use scenarios. With the consumption of the battery pack, the capacity of the battery pack decreases, and the voltage of the battery pack generally decreases. Therefore, the capacity detection of the cylindrical lithium battery in the present application is the capacity detection and maximum capacity detection within the optimal working range of the cylindrical lithium battery pack 01.

[0033] Specifically, a constant current load 102 and a voltage tester 106 connected with the connecting plate 104 are arranged in the detection table 101, the constant current load 102 is preferably an LED lamp set, which is used to discharge the cylindrical lithium battery pack 01. The connecting plate 104 capable of being connected with the cylindrical lithium battery pack 01 is arranged on the detection table 101, the constant current load 102 is connected with the connecting plate 104 through the external lead 105, and the voltage tester 106 is used to detect and display the voltage of the cylindrical lithium battery pack 01 in real time.

[0034] The cylindrical lithium battery pack 01 is discharged by the constant current load 102, the voltage change of the cylindrical lithium battery pack 01 is observed, and then the capacity of the cylindrical lithium battery pack 01 is calculated by the discharge time. The detection process is stable and safe, and the capacity of the cylindrical lithium battery pack 01 within the optimal working voltage range can be detected at the same time.

[0035] The key point is that a comparison circuit is arranged in the detection table 101, the comparison circuit is connected with the connecting plate 104, the comparison circuit includes a comparator one and a comparator two, the comparator one is connected with the voltage input end of the cylindrical lithium battery pack 01 and the voltage input end of the reference voltage one, and the comparator two is connected with the voltage input end of the cylindrical lithium battery pack 01 and the voltage input end of the reference voltage two; the comparator one and the comparator two are respectively used to compare the voltage of the cylindrical lithium battery pack 01 with the reference voltage one and the reference voltage two.

[0036] The reference voltage one is the optimal working voltage of the preset use scene, and the reference voltage two is the power shortage voltage.

[0037] In addition, the detection table 101 is further provided with a first alarm 107 and a second alarm 109 for alarm, and a first timer 108 and a second timer 110 for timing.

[0038] The first alarm 107 alarms when the voltage of the cylindrical lithium battery group 01 is lower than the reference voltage one, and the first timer 108 is used for recording the time consumed for the voltage of the cylindrical lithium battery group 01 to decrease to the reference voltage one. The second alarm 109 alarms when the voltage of the cylindrical lithium battery group 01 is lower than the reference voltage two, and the second timer 110 is used for recording the time consumed for the voltage of the cylindrical lithium battery group 01 to decrease to the reference voltage two.

[0039] The comparison circuit is designed, the reference voltage one and the reference voltage two are set in advance, the reference voltage one is the optimal working voltage of the preset use scene, and the reference voltage two is the power shortage voltage, and alarm and timing are performed when the voltage of the cylindrical lithium battery group 01 is lower than the reference voltage one and the reference voltage two respectively.

[0040] A second aspect of the utility model is shown in the drawings, Figure 1 、 Figure 2 and Figure 4 A connecting plug 111 matched with the joint of the cylindrical lithium battery group 01 is arranged at the lower end of the connecting plate 104, the connecting plate 104 is fixedly connected to the top of the telescopic plate 113, the telescopic plate 113 is slidably connected in the fixed seat 103, and the fixed seat 103 is fixedly connected to the detection table 101.

[0041] The connecting plate 104 and the telescopic plate 113 are provided with an inner lead wire 114 connected with the connecting plug 111, the inner lead wire 114 is fixedly connected with a connecting rod 117 at the end, and the telescopic plate 113 is further movably connected with a movable connecting piece 116, the movable connecting piece 116 is movably connected with the connecting rod 117, and the rear end of the movable connecting piece 116 is connected with a spring 118. The fixed seat 103 is provided with a connecting piece 119 matched with the movable connecting piece 116, and the connecting piece 119 is connected with the outer lead wire 105. In addition, the fixed seat 103 is slidably connected with a buckle 112, and the telescopic plate 113 is provided with a buckle groove 115 matched with the buckle 112.

[0042] The connecting plate 104 is designed as a connecting piece of the cylindrical lithium battery pack 01, and the connecting plate 104 is connected with the cylindrical lithium battery pack 01, and then the connecting plate 104 is connected with the external lead wire 105 through the movable connecting piece 116 and the connecting piece 119, so that the stability of the circuit connection is ensured.

[0043] Based on the above, the cylindrical lithium battery pack 01 is discharged by using the constant current load 102, the voltage change of the cylindrical lithium battery pack 01 is observed, and then the capacity of the cylindrical lithium battery pack 01 is calculated by the discharge time. The detection process is stable and safe, and the capacity of the cylindrical lithium battery pack 01 in the best working voltage range can be detected. A comparison circuit is designed, and reference voltage one and reference voltage two are set in advance. The reference voltage one is the best working voltage of the preset use scene, and the reference voltage two is the power loss voltage. When the voltage of the cylindrical lithium battery pack 01 is lower than the reference voltage one and the reference voltage two respectively, alarm and timing are performed. The capacity and total capacity of the cylindrical lithium battery pack 01 in the best working range can be conveniently and accurately detected. The connecting plate 104 is designed as a connecting piece of the cylindrical lithium battery pack 01, and the connecting plate 104 is connected with the cylindrical lithium battery pack 01, and then the connecting plate 104 is connected with the external lead wire 105 through the movable connecting piece 116 and the connecting piece 119, so that the stability of the circuit connection is ensured.

[0044] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to suggest that the scope of the utility model includes the right claims limited to these examples; under the idea of the utility model, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above. In order to be brief, they are not provided in details.

[0045] The utility model aims at covering all such alternatives, modifications and variations falling within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cylindrical lithium battery capacity detection device, comprising a detection table (101), a constant current load (102) is arranged on the detection table (101) for discharging a cylindrical lithium battery pack (01), characterized in that, The capacity detection device comprises: A connecting plate (104) capable of being connected with the cylindrical lithium battery pack (01), and the constant current load (102) is connected with the connecting plate (104) through an outer lead wire (105); A comparison circuit arranged in the detection table (101), the comparison circuit is connected with the connecting plate (104), and the comparison circuit comprises a comparator I and a comparator II, the comparator I is connected with a voltage input end of the cylindrical lithium battery pack (01) and a voltage input end of a reference voltage I, and the comparator II is connected with the voltage input end of the cylindrical lithium battery pack (01) and a voltage input end of a reference voltage II; A voltage tester (106) connected with the connecting plate (104) is used for detecting and displaying the voltage of the cylindrical lithium battery pack (01) in real time; A first alarm (107) and a second alarm (109) for alarm; A first timer (108) and a second timer (110) for timing; The first alarm (107) and the first timer (108) are connected with the comparator I, and the second alarm (109) and the second timer (110) are connected with the comparator II. 2.The cylindrical lithium battery capacity detection device according to claim 1, characterized in that: The reference voltage I and the reference voltage II are set in advance, wherein the reference voltage I is the optimal working voltage of the preset use scenario, and the reference voltage II is the power shortage voltage. 3.The cylindrical lithium battery capacity detection device according to claim 2, characterized in that: The first alarm (107) alarms when the voltage of the cylindrical lithium battery pack (01) is lower than the reference voltage I, and the first timer (108) is used for recording the time consumed for the voltage of the cylindrical lithium battery pack (01) to decrease to the reference voltage I. 4.The cylindrical lithium battery capacity detection device according to claim 2, characterized in that: The second alarm (109) alarms when the voltage of the cylindrical lithium battery pack (01) is lower than the reference voltage II, and the second timer (110) is used for recording the time consumed for the voltage of the cylindrical lithium battery pack (01) to decrease to the reference voltage II.

5. The cylindrical lithium battery capacity detection device according to claim 1, characterized in that: A connecting plug (111) matched with the joint of the cylindrical lithium battery pack (01) is arranged at the lower end of the connecting plate (104), the connecting plate (104) is fixedly connected at the top of a telescopic plate (113), the telescopic plate (113) is slidingly connected in a fixed seat (103), and the fixed seat (103) is fixedly connected on the detection table (101). 6.The cylindrical lithium battery capacity detection device according to claim 5, characterized in that: The connecting plate (104) and the telescopic plate (113) are provided with an inner lead wire (114) connected with the connecting plug (111), the end of the inner lead wire (114) is fixedly connected with a connecting rod (117), the telescopic plate (113) is further movably connected with a movable connecting piece (116), the movable connecting piece (116) is movably connected with the connecting rod (117), and the rear end of the movable connecting piece (116) is connected with a spring (118). 7.The cylindrical lithium battery capacity detection device according to claim 6, characterized in that: The fixed seat (103) is provided with a connecting sheet (119) matched with the movable connecting piece (116), and the connecting sheet (119) is connected with the outer lead wire (105). 8.The cylindrical lithium battery capacity detection device according to claim 5, characterized in that: A buckle (112) is slidingly connected on the fixed seat (103), and a buckle groove (115) matched with the buckle (112) is arranged on the telescopic plate (113).

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