Lithium battery pack overcharge and overdischarge protection circuit

Abstract

The utility model discloses an overcharge and overdischarge protection circuit for a lithium battery pack, which belongs to the technical field of lithium battery packs and comprises a BMS (battery management system), a base is arranged at the bottom of the BMS, a groove is formed in the top of the base along the length direction, the bottom end of the BMS is positioned in the groove, and side clamping plates are arranged at two ends of the top of the base in a sliding manner. The BMS is vertically inserted into the top of the base, the two sets of side clamping plates are controlled to move at the same time through a distance adjusting mechanism composed of the strip-shaped guide grooves in the top of the base, the first sliding blocks, the two-way screw rods and the adjusting blocks, the positions of the side clamping plates can be rapidly adjusted in the using process, positioning and fixing are not needed, and the using efficiency is improved. And in addition, a linkage mechanism composed of a vertical guide groove between the side pressing plate and the upper pressing plate, a second sliding block, a supporting rod, a pull rope, a first spring and a second spring is matched for use, the side edge and the top of the BMS can be limited during fixing, disassembly, assembly and use are more convenient, and the practicability is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to a protection device, in particular to a lithium battery pack overcharge overdischarge protection circuit belongs to lithium battery pack technical field. BACKGROUND

[0002] BMS is one of the most important protection devices of lithium battery pack, it is like a "intelligent housekeeper", comprehensive monitoring and management battery pack's state, the purpose is to be able to improve the utilization of battery, prevent battery from overcharging and overdischarge, prolong the service life of battery, monitor the state of battery.

[0003] The prior art such as the utility model with the application number 202222967836.1 discloses a BMS support and BMS assembly, to solve when the BMS is replaced, if the mounting hole position of new and old BMS is not unified, then new BMS support needs to be redesigned and manufactured, thereby leading to the increase of design and manufacturing cost, through the two side supports with adjustable spacing, BMS is clamped, and is limited with installation groove, this installation mode only needs the outer dimension of BMS and the size of installation groove correspond, and does not need to have corresponding mounting hole position on BMS, simultaneously, the spacing between the two side supports of the scheme is adjustable, corresponding the present situation that existing BMS width exists various specifications, and thickness is standardized, thereby can compatible various different specifications of BMS.

[0004] Similar to the above application, there are still deficiencies:

[0005] In the process of installing BMS through the support, the side plate needs to be installed and fixed through the bolt first, after lateral fixation, the limiting rod needs to be inserted and installed, and the limiting rod is limited at the top of BMS, and the disassembly and assembly are inconvenient;

[0006] Therefore, a lithium battery pack overcharge overdischarge protection circuit is designed to optimize the above problems. UTILITY MODEL CONTENTS

[0007] The main purpose of the utility model is to provide a lithium battery pack overcharge overdischarge protection circuit to solve the problems in the above background technology.

[0008] The purpose of the utility model can be achieved by adopting the following technical scheme:

[0009] The utility model provides a kind of lithium battery pack overcharge overdischarge protection circuit, including BMS, the bottom of BMS is provided with base, the top of base is opened with recess along length direction, the bottom end of BMS is located in the inside of recess, both ends of base top are slidably provided with side clamping plate, the middle position of base top is equipped with interval adjusting mechanism of control side clamping plate simultaneously moving, the inside of side clamping plate is vertically provided with side pressing plate, the inner top of side clamping plate is vertically slidably provided with upper pressing plate, the inside of side clamping plate is equipped with linkage mechanism of control upper pressing plate vertical movement with side pressing plate translation.

[0010] Preferably: both ends of base are equipped with lug plate, and fixed hole is opened on lug plate.

[0011] Preferably: interval adjusting mechanism includes strip guide slot, first slider, two-way screw and adjusting block, strip guide slot is opened in the top of base along the length direction of base, both ends in the inside of strip guide slot are slidably equipped with first slider, the top end of first slider is flush with the top of base, the outside of side clamping plate is respectively fixed on first slider, two-way screw is rotatably installed between the both ends of base, both ends of two-way screw are respectively threadedly connected with first slider, both ends of two-way screw are fixed with adjusting block.

[0012] Preferably: the shape of adjusting block is circular, and the outside of adjusting block is equipped with antiskid line.

[0013] Preferably: the bottom end of side clamping plate is attached to the top of base, and reinforcing rib is arranged between the outside of side clamping plate and first slider.

[0014] Preferably: linkage mechanism includes vertical guide slot, second slider, support rod, pull rope, first spring and second spring, vertical guide slot is vertically opened in the inside of side clamping plate, both ends of vertical guide slot are slidably provided with second slider, support rod is hingedly installed between second slider and side pressing plate, first spring is arranged between the inner top of side clamping plate and upper pressing plate, the second slider of vertical guide slot top is connected with upper pressing plate, second spring is arranged between the inside of side pressing plate and the inside of side clamping plate.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model discloses a kind of lithium battery pack overcharge overdischarge protection circuit, including BMS, the bottom of BMS is provided with base, the top of base is opened with recess along length direction, the bottom end of BMS is located in the inside of recess, both ends of base top are slidably provided with side clamping plate, the middle position of base top is equipped with interval adjusting mechanism of control side clamping plate simultaneously moving, the inside of side clamping plate is vertically provided with side pressing plate, the inner top of side clamping plate is vertically slidably provided with upper pressing plate, the inside of side clamping plate is equipped with linkage mechanism of control upper pressing plate vertical movement with side pressing plate translation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a front view of the utility model;

[0018] Figure 2 is a support structure view of the utility model;

[0019] Figure 3 is a support front view of the utility model;

[0020] Figure 4 is a side clamping plate top end partial structure view of the utility model.

[0021] In the figure: 1, base; 101, fixing hole;

[0022] 2, side clamping plate;

[0023] 3, spacing adjustment mechanism; 301, strip-shaped guide groove; 302, first sliding block; 303, bidirectional screw rod; 304, adjustment block;

[0024] 4, side pressing plate; 5, upper pressing plate;

[0025] 6, linkage mechanism; 601, vertical guide groove; 602, second sliding block; 603, support rod; 604, pull rope; 605, first spring; 606, second spring;

[0026] 7, BMS. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments.

[0028] Therefore, the following detailed description of the embodiments of the utility model is not intended to limit the scope of the claimed utility model, but only represents some embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0029] It should be noted that the embodiments and the features and technical solutions in the embodiments in the utility model can be combined with each other without conflict.

[0030] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0031] In the description of the utility model, it needs to explain, the orientation or position relation indicated by the terms "upper", "lower" and the like is based on the orientation or position relation shown in the drawings, or is the orientation or position relation that the product of the application is usually placed when being used, or is the orientation or position relation that is usually understood by the person skilled in the art, these terms are only for the convenience of describing the utility model and simplifying the description, and not for indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0032] Embodiment 1

[0033] As Figure 1 , Figure 2 , Figure 3 and Figure 4 indicated, the embodiment proposes a lithium battery pack overcharge and overdischarge protection circuit, including BMS7, the bottom of BMS7 is provided with base 1, the top of base 1 is provided with recess along the length direction, the bottom end of BMS7 is located in the inside of recess, both ends of the top of base 1 are slidingly provided with side clamping plate 2, the middle position of the top of base 1 is provided with spacing adjustment mechanism 3 for controlling side clamping plate 2 to move simultaneously, the inside of side clamping plate 2 is vertically provided with side pressing plate 4, the inside top of side clamping plate 2 is vertically slidingly provided with upper pressing plate 5, the inside of side clamping plate 2 is provided with linkage mechanism 6 for controlling upper pressing plate 5 to move vertically along with side pressing plate 4 to translate.

[0034] When installing BMS7, first, base 1 is fixed at the installation position, then the bottom end of BMS7 is inserted into the top of base 1, then spacing adjustment mechanism 3 is used to control two groups of side clamping plate 2 to move towards each other, side pressing plate 4 is attached to the surface of BMS7, then side pressing plate 4 is extruded towards the inside of side clamping plate 2, and linkage mechanism 6 is used to control the vertical movement of upper pressing plate 5 while side pressing plate 4 moves inside side clamping plate 2, after upper pressing plate 5 is attached to the top of BMS7, the control of spacing adjustment mechanism 3 is stopped, and the fixing of BMS7 is completed.

[0035] Embodiment 2

[0036] The scheme in embodiment 1 is further introduced in combination with specific working modes, and details are described below:

[0037] As Figure 1 indicated, as a preferred embodiment, on the basis of the above mode, further, both ends of base 1 are provided with ear plates, and fixed holes 101 are formed in the ear plates, when base 1 is fixed, the screw is passed through fixed hole 101 to fix base 1 on the shell of the battery pack.

[0038] AsFigure 3 As shown, in a preferred embodiment, based on the above method, the spacing adjustment mechanism 3 further includes a strip guide groove 301, a first slider 302, a bidirectional screw 303, and an adjustment block 304. The strip guide groove 301 is opened at the top of the base 1 along the length direction of the base 1. The first slider 302 is slidably provided at both ends inside the strip guide groove 301. The top end of the first slider 302 is flush with the top of the base 1. The outer sides of the side plate 2 are respectively fixed on the first slider 302. The bidirectional screw 303 is rotatably installed between the two ends of the base 1. The two ends of the bidirectional screw 303 are respectively threaded to the first slider 302. The adjustment block 304 is fixed at both ends of the bidirectional screw 303.

[0039] When adjusting the side plate 2, the initial position of the side plate 2 is located at both ends of the base 1. By rotating the adjusting block 304, the rotation of the bidirectional screw 303 is controlled. The rotation of the bidirectional screw 303 drives the two sets of first sliders 302 to move towards each other. Therefore, the two sets of side plates 2 move towards BMS7 at the same time, and squeeze and fix BMS7.

[0040] like Figure 1 As shown, in a preferred embodiment, based on the above method, the adjusting block 304 is circular in shape, and the outer side of the adjusting block 304 is provided with anti-slip texture. The anti-slip texture facilitates the rotation control of the adjusting block 304.

[0041] like Figure 1 As shown, in a preferred embodiment, based on the above method, the bottom end of the side plate 2 is attached to the top of the base 1, and a reinforcing rib is provided between the outer side of the side plate 2 and the first slider 302. The reinforcing rib can improve the connection stability between the side plate 2 and the first slider 302.

[0042] like Figure 3 As shown, in a preferred embodiment, based on the above method, the linkage mechanism 6 further includes a vertical guide groove 601, a second slider 602, a support rod 603, a pull rope 604, a first spring 605, and a second spring 606. The vertical guide groove 601 is vertically opened on the inner side of the side plate 2. The second slider 602 is slidably arranged at both the upper and lower ends of the vertical guide groove 601. The support rod 603 is hinged between the second slider 602 and the side pressure plate 4. The first spring 605 is provided between the inner top of the side plate 2 and the upper pressure plate 5. The second slider 602 at the top of the vertical guide groove 601 is connected to the upper pressure plate 5. The second spring 606 is provided between the inner side of the side pressure plate 4 and the inner side of the side plate 2.

[0043] In the fixed BMS7, the side pressing plate 4 first fits with the surface of the BMS7, at this time the upper pressing plate 5 is located at the top of the BMS7, with the continuous movement of the side clamping plate 2, the side pressing plate 4 will move towards the inside of the side clamping plate 2, the side pressing plate 4 exerts extrusion force on the second sliding block 602 through the supporting rod 603, the two groups of second sliding blocks 602 move towards each other, the second sliding block 602 at the top of the side clamping plate 2 moves downward, the vertical downward movement of the upper pressing plate 5 is driven by the pull rope 604, until it fits with the top of the BMS7, the fixing of the BMS7 is completed.

[0044] Embodiment 3

[0045] The schemes in Embodiment 1 and Embodiment 2 are further introduced in combination with specific working modes, and details are described as follows:

[0046] In the fixed base 1, the base 1 is fixed on the shell of the battery pack by screwing through the fixing hole 101, then the bottom end of the BMS7 is vertically inserted into the groove at the top of the base 1, the rotation of the adjusting block 304 is controlled, the rotation of the bidirectional screw rod 303 drives the two groups of first sliding blocks 302 to move towards each other, so that the two groups of side clamping plates 2 move towards the BMS7 at the same time, the side pressing plate 4 first fits with the surface of the BMS7, at this time the upper pressing plate 5 is located at the top of the BMS7, with the continuous movement of the side clamping plate 2, the side pressing plate 4 will move towards the inside of the side clamping plate 2, the side pressing plate 4 exerts extrusion force on the second sliding block 602 through the supporting rod 603, the two groups of second sliding blocks 602 move towards each other, the second sliding block 602 at the top of the side clamping plate 2 moves downward, the vertical downward movement of the upper pressing plate 5 is driven by the pull rope 604, until it fits with the top of the BMS7, the fixing of the BMS7 is completed.

[0047] The above is only further embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical scheme and concept of the present application within the disclosed range, which belongs to the protection scope of the present application.

Claims

1. A lithium battery pack overcharge and overdischarge protection circuit comprising a BMS (7), characterized in that: The bottom of the BMS (7) is provided with a base (1), the top of the base (1) is provided with a groove along the length direction, the bottom end of the BMS (7) is located in the groove, both ends of the top of the base (1) are slidingly provided with side clamping plates (2), the middle position of the top of the base (1) is provided with a spacing adjusting mechanism (3) for controlling the simultaneous movement of the side clamping plates (2), the inner side of the side clamping plate (2) is vertically provided with a side pressing plate (4), the inner top of the side clamping plate (2) is vertically slidingly provided with an upper pressing plate (5), and the inner side of the side clamping plate (2) is provided with a linkage mechanism (6) for controlling the vertical movement of the upper pressing plate (5) along with the translation of the side pressing plate (4).

2. The overcharge and overdischarge protection circuit for lithium battery pack according to claim 1, characterized in that: Both ends of the base (1) are provided with an ear plate, and a fixing hole (101) is formed in the ear plate.

3. The overcharge and overdischarge protection circuit for lithium battery pack according to claim 1, characterized in that: The spacing adjusting mechanism (3) comprises a strip-shaped guide groove (301), a first sliding block (302), a bidirectional screw (303) and an adjusting block (304), the strip-shaped guide groove (301) is formed in the top of the base (1) along the length direction of the base (1), both ends of the strip-shaped guide groove (301) are slidingly provided with the first sliding block (302), the top end of the first sliding block (302) is flush with the top of the base (1), the outer sides of the side clamping plates (2) are respectively fixed on the first sliding blocks (302), and the bidirectional screw (303) is rotatably installed between both ends of the base (1), both ends of the bidirectional screw (303) are threadedly connected with the first sliding blocks (302), and both ends of the bidirectional screw (303) are fixed with the adjusting blocks (304).

4. The overcharge and overdischarge protection circuit for a lithium battery pack of claim 3, wherein: The adjusting block (304) is circular in shape, and the outer side of the adjusting block (304) is provided with anti-skid lines.

5. The overcharge and overdischarge protection circuit for lithium battery pack according to claim 3, characterized in that: The bottom end of the side clamping plate (2) is attached to the top of the base (1), and the outer side of the side clamping plate (2) is provided with a reinforcing rib between the first sliding block (302).

6. The overcharge and overdischarge protection circuit for a lithium battery pack according to any one of claims 1-5, characterized in that: The linkage mechanism (6) comprises a vertical guide groove (601), a second sliding block (602), a supporting rod (603), a pull rope (604), a first spring (605) and a second spring (606), the vertical guide groove (601) is vertically formed in the inner side of the side clamping plate (2), both ends of the vertical guide groove (601) are slidingly provided with the second sliding block (602), the supporting rod (603) is hingedly installed between the second sliding block (602) and the side pressing plate (4), the first spring (605) is arranged between the inner top of the side clamping plate (2) and the upper pressing plate (5), the second sliding block (602) at the top of the vertical guide groove (601) is connected with the upper pressing plate (5), and the second spring (606) is arranged between the inner side of the side pressing plate (4) and the inner side of the side clamping plate (2).

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