Quickly-assembled lithium battery cell structure and lithium battery pack thereof

Abstract

The utility model belongs to the technical field of lithium batteries, and particularly relates to a fast-assembly type lithium battery cell structure which comprises a cell part composed of a shell, a positive electrode material and a negative electrode material wrapped by the shell, and a positive electrode cap connected to one end of the shell and connected with the shell in an insulated mode. One side of the positive electrode cap and one end of the shell are connected with connecting parts, and the connecting parts are located in the insulating extension ring body; the two connecting parts are respectively arranged on one side of the positive electrode cap and one end of the shell, so that the positive electrode and the negative electrode of the battery cell part are connected with the frame in a contact pin type connection manner, the positive electrode and the negative electrode of each battery cell do not need to be welded with a connecting sheet in the manner, and rapid assembly and connection are facilitated; and meanwhile, when a single battery cell breaks down, the single battery cell can be quickly disassembled and replaced, so that the maintenance and the replacement become simpler and quicker.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, specifically to a quick-install lithium battery cell structure and its lithium battery pack. Background Technology

[0002] Lithium batteries, as an efficient and environmentally friendly energy storage and supply method, have been widely used in electric vehicles, mobile devices, energy storage systems and other fields. A lithium battery pack consists of multiple lithium battery cells, which are composed of positive electrode plates, negative electrode plates, separators, positive electrode caps, insulation parts, and shells. A lithium battery pack is assembled by connecting and welding the positive and negative electrodes of multiple lithium battery cells in series.

[0003] In existing technologies, after arranging multiple lithium battery cells, it is necessary to connect the connecting pieces to the polarity of each lithium battery cell by welding. Although this method can ensure the stability of the connection, the connection formed after welding is fixed and usually quite strong. Once the battery fails, especially when there is poor contact or breakage at the welding point, repair and replacement will become very difficult. Utility Model Content

[0004] The purpose of this application is to provide a quick-installation lithium battery cell structure and a lithium battery pack thereof to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a quick-connect lithium battery cell structure, comprising a cell part consisting of a shell, a positive electrode material and a negative electrode material enclosed by the shell, and a positive electrode cap connected to one end of the shell and insulated from the shell. Insulating extension rings are fixed to both ends of the shell, and connecting portions are connected to one side of the positive electrode cap and one end of the shell, with the connecting portions located inside the insulating extension rings.

[0006] The connecting part includes multiple columns fixed to one side of the positive electrode cap and one side of the outer shell, multiple sleeves movably sleeved on the outside of the multiple columns, two insulating seats sleeved on the outside of a single sleeve, and a spring connecting two adjacent insulating seats, wherein one of the insulating seats is fixed to one side of the sleeve.

[0007] In one embodiment, the outer surface of the insulating extension ring is integrally formed with a foolproof flange.

[0008] In one embodiment, a thermally conductive protective sleeve is also fitted over the outer shell, and two sets of buckles are fixed to both sides of the thermally conductive protective sleeve.

[0009] In one embodiment, the inner parts of the outer shell and the insulating extension ring are further connected to an end connection unit, which includes a movable groove 1 opened inside the outer shell and the insulating extension ring, a guide rod 1 fixed to the inner wall of the movable groove 1, a spring 2 sleeved on the outside of the guide rod 1, a slide seat movably sleeved on the outside of the guide rod 1 and slidingly connected to the inner wall of the movable groove 1, a movable groove 2 opened inside the insulating extension ring and connected to the movable groove 1, a guide rod 2 fixed to the inner wall of the movable groove 2, a spring 3 sleeved on the outside of the guide rod 2, a limiting seat movably sleeved on the outside of the guide rod 2 and slidingly connected to the inner wall of the movable groove 2, an inclined groove opened inside the limiting seat, and an extension end integrally formed on one side of the slide seat and inserted into the inclined groove at the other end.

[0010] In one embodiment, the two ends of the second spring are respectively connected to the inner wall of the first movable groove and one side of the slide, and the two ends of the third spring are respectively connected to the inner wall of the second movable groove and one side of the limiting seat.

[0011] A lithium battery pack includes multiple quick-connect lithium battery cell structures, and also includes upper and lower frames, multiple slots opened inside the two frames for accommodating multiple insulating extension rings, connectors fixed to the inner walls of the multiple slots for connecting to the sleeves, connecting pieces fixed inside the frames and connected to the connectors, a second slot opened on the inner wall of the slots for accommodating a limiting seat, a first slot opened on one side of the frame for accommodating a buckle, and straps tied to the outside of multiple thermally conductive protective sleeves.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] This application provides two connecting parts on one side of the positive cap and one end of the outer casing, so that the positive and negative terminals of the battery cell are connected to the frame by a pin-type connection. This method eliminates the need to weld the positive and negative terminals of each battery cell to the connecting piece, which facilitates quick assembly and connection. At the same time, when a single battery cell fails, it can also be quickly disassembled and replaced, making maintenance and replacement simpler and faster. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the battery cell, thermal protection sleeve, and snap-fit ​​structure of this application;

[0015] Figure 2 This is a cross-sectional view of the housing and insulating extension ring of this application;

[0016] Figure 3 For this application Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0017] Figure 4 For this application Figure 2 Enlarged view of the structure at point B;

[0018] Figure 5 The structure diagram of the lithium battery pack of the present application is shown in the figure.

[0019] Figure 6 The structure diagram of the slot and connecting piece of the present application is shown in the figure.

[0020] Figure 7 The structure diagram of the connecting piece inside one of the frames of the present application is shown in the figure. Figure 6 The enlarged structure diagram of the structure at C in the present application is shown in the figure.

[0021] Figure 8 The structure diagram of the connecting piece inside one of the frames of the present application is shown in the figure.

[0022] Figure 9 The positive and negative butt joint diagram of the slot of one of the frames of the present application is shown in the figure.

[0023] Figure 10 The structure diagram of the connecting piece inside one of the frames of the present application is shown in the figure.

[0024] Figure 11 The positive and negative butt joint diagram of the slot of one of the frames of the present application is shown in the figure.

[0025] In the figure: 1, the battery cell part; 11, the shell; 12, the positive cap; 13, the insulating extension ring body; 14, the foolproof flange; 2, the connecting part; 21, the column body; 22, the sleeve body; 23, the insulating seat; 24, spring one; 3, the heat-conducting protective sleeve; 4, the buckle; 5, the end connecting unit; 51, the movable groove one; 52, the sliding seat; 521, the extension end; 53, the guide rod one; 54, spring two; 55, the movable groove two; 56, the guide rod two; 57, spring three; 58, the limiting seat; 59, the inclined slot; 6, the binding belt; 7, the frame; 71, the slot; 72, the connecting piece; 73, the connecting piece; 74, the clamping groove one; 75, the clamping groove two. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] Embodiment:

[0029] Please refer to Figures 1-11 , the application provides a technical scheme: a quick installation type lithium battery cell structure, which comprises a cell part 1 composed of a shell 11, a positive electrode material and a negative electrode material wrapped by the shell 11, a positive electrode cap 12 connected at one end of the shell 11 and insulated from the shell 11, the shell 11 is provided with an insulating extension ring body 13 at both ends, the positive electrode cap 12 is connected with a connecting part 2 at one side and one end of the shell 11, and the connecting part 2 is located in the inside of the insulating extension ring body 13; the outer surface of the insulating extension ring body 13 is integrally formed with a foolproof flange 14, the insulating extension ring body 13 is used for protecting the connecting part 2, and when the insulating extension ring body 13 is inserted into the frame 7, it can play a guiding role, the foolproof flange 14 plays a positioning role, avoiding the position of the insulating extension ring body 13 inserted into the frame 7, which causes the connecting part 2 unable to be connected with the connecting part 2 in the frame 7.

[0030] As Figure 3 shown, the connecting part 2 comprises a plurality of columns 21 respectively fixed at one side of the positive electrode cap 12 and one side of the shell 11, a plurality of sleeves 22 respectively movably sleeved outside the plurality of columns 21, two insulating bases 23 sleeved outside a single sleeve 22, a spring 24 connecting the adjacent two insulating bases 23, and one of the insulating bases 23 is fixed on one side of the sleeve 22, when the insulating extension ring body 13 and the connecting part 2 are inserted into the slot 71 inside the frame 7, the spring 24 can push the sleeve 22 to move outside the column 21, so that one side of the sleeve 22 can always be attached to one side of the connecting piece 73, ensuring the stability of the connection between the sleeve 22 and the connecting piece 73, avoiding poor contact caused by vibration or frequent plugging, and at the same time, the use of multiple columns 21 and multiple sleeves 22 increases the contact area and reduces the contact resistance, especially in high current applications.

[0031] As Figures 1-4 shown, the shell 11 is further sleeved with a heat-conducting protective sleeve 3, and two groups of buckles 4 are fixed on both sides of the heat-conducting protective sleeve 3, the heat-conducting protective sleeve 3 can realize heat dissipation of the shell 11, and also can protect the shell 11, the heat-conducting protective sleeve 3 can be made of aluminum alloy material, which has good impact resistance, light weight and strong heat conductivity, the two groups of buckles 4 can be buckled in the clamping groove 74 in the two frames 7 respectively, and the two frames 7 can be connected through the heat-conducting protective sleeve 3.

[0032] The inside of the shell 11 and the insulating extension ring body 13 is also connected with the end connecting unit 5, and the end connecting unit 5 comprises a movable groove one 51 opened in the inside of the shell 11 body and the insulating extension ring body 13, a guide rod one 53 fixed on the inner wall of the movable groove one 51, a spring two 54 sleeved on the outside of the guide rod one 53, a sliding seat 52 movably sleeved on the outside of the guide rod one 53 and slidably connected with the inner wall of the movable groove one 51, a movable groove two 55 opened in the inside of the insulating extension ring body 13 and communicated with the movable groove one 51, a guide rod two 56 fixed on the inner wall of the movable groove two 55, a spring three 57 sleeved on the outside of the guide rod two 56, a limiting seat 58 movably sleeved on the outside of the guide rod two 56 and slidably connected with the inner wall of the movable groove two 55, an inclined groove 59 opened in the inside of the limiting seat 58, an extension end 521 integrally formed on one side of the sliding seat 52 and inserted into the inclined groove 59, and the two ends of the spring two 54 are respectively connected with the inner wall of the movable groove one 51 and one side of the sliding seat 52, and the two ends of the spring three 57 are respectively connected with the inner wall of the movable groove two 55 and one side of the limiting seat 58.

[0033] When the insulating extension ring body 13 is inserted into the clamping groove two 75 in the inside of the frame 7, the limiting seat 58 can be clamped in the clamping groove two 75, so that the two frames 7 can be clamped at the two ends of the shell 11, when it is needed to take out the limiting seat 58 from the clamping groove two 75, the sliding seat 52 is pushed to move towards the spring two 54, the movement of the sliding seat 52 drives the movement of the extension end 521, the inclined surface of one end of the extension end 521 cooperates with the inclined groove 59, the extension end 521 pushes the limiting seat 58 to move into the movable groove one 51, and the limiting seat 58 moves along the guide rod two 56 and the movable groove two 55, so that the spring three 57 is compressed, and after the limiting seat 58 is retracted into the movable groove one 51, the insulating extension ring body 13 can be taken out from the insertion slot 71, so that the separation of the electric core part 1 and the frame 7 is realized.

[0034] As shown in Figures 5-11 A lithium battery pack comprises a plurality of quick-mount lithium battery core structures, further comprises two frames 7, a plurality of insertion slots 71 opened in the inside of the two frames 7 and used for respectively accommodating a plurality of insulating extension ring bodies 13, a plurality of connecting pieces 72 respectively fixed on the inner walls of the plurality of insertion slots 71 and used for being connected with the sleeve body 22, a connecting piece 73 fixed in the inside of the frame 7 and connected with the connecting piece 72, a clamping groove two 75 opened on the inner wall of the insertion slot 71 and used for accommodating the limiting seat 58, a clamping groove one 74 opened on one side of the frame 7 and used for accommodating the buckle 4, and a binding belt 6 bound on the outside of the plurality of heat-conducting protective sleeves 3, since the electric cores in the lithium battery pack are connected in series, the polarity of the upper ends of the four electric core groups (one single-core group in the application is composed of four quick-mount lithium battery core structures) bound by the binding belt 6 is as shown in Figure 5 The polarity of the lower ends of the four electric core groups is as shown in Figure 9 The polarity of the lower ends of the four electric core groups is as shown in Figure 11As shown, the structure inside the connecting piece 73 inside the frame 7 connected at the upper end of the four groups of battery cells is as follows Figure 8 As shown, the frame 7 at the upper end has two connecting pieces 73, which are respectively connected with the positive and negative poles of the two groups of battery cells at the two sides, and the structure inside the connecting piece 73 inside the frame 7 connected at the lower end of the four groups of battery cells is as follows Figure 10 As shown, the frame 7 at the lower end has one connecting piece 73, which is used to connect the positive and negative poles of the two groups of battery cells in the middle in series.

[0035] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic features of the present application; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application, and no figure reference in the claims should be regarded as limiting the claims.

[0036] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A quick-mount lithium battery cell structure, comprising a cell part composed of a shell, a positive electrode material and a negative electrode material wrapped by the shell, and a positive electrode cap connected at one end of the shell and insulatedly connected with the shell, characterized in that: The shell is fixed with an insulating extension ring body at both ends, the positive cap is connected with a connecting part at one side, and the connecting part is located inside the insulating extension ring body. The connecting part comprises a plurality of columns fixed at the positive cap and the shell respectively, a plurality of sleeves movably sleeved outside the columns respectively, two insulating bases sleeved outside a single sleeve, a spring one connecting the adjacent two insulating bases, and one of the insulating bases is fixed at one side of the sleeve.

2. The quick-mounting lithium battery cell structure according to claim 1, characterized in that: The outer surface of the insulating extension ring body is integrally formed with an anti-stupid flange.

3. The quick-mounting lithium battery cell structure according to claim 2, characterized in that: The shell is further sleeved with a heat-conducting protective sleeve, and two groups of buckles are fixed at both sides of the heat-conducting protective sleeve.

4. The quick-mounting lithium battery cell structure according to claim 3, characterized in that: The inside of the shell and the insulating extension ring body is further connected with an end connecting unit, and the end connecting unit comprises a movable groove one opened in the shell and the insulating extension ring body, a guide rod one fixed on the inner wall of the movable groove one, a spring two sleeved outside the guide rod one, a sliding seat movably sleeved outside the guide rod one and slidably connected with the inner wall of the movable groove one, a movable groove two opened in the insulating extension ring body and connected with the movable groove one, a guide rod two fixed on the inner wall of the movable groove two, a spring three sleeved outside the guide rod two, a limiting seat movably sleeved outside the guide rod two and slidably connected with the inner wall of the movable groove two, an inclined groove opened in the limiting seat, an extension end integrally formed on one side of the sliding seat and inserted into the inclined groove at the other end.

5. The quick-mounting lithium battery cell structure according to claim 4, characterized in that: The two ends of the spring two are respectively connected with the inner wall of the movable groove one and one side of the sliding seat, and the two ends of the spring three are respectively connected with the inner wall of the movable groove two and one side of the limiting seat.

6. A lithium battery pack comprising a plurality of quick-mount lithium battery cell structures according to any one of claims 1-5, characterized in that: It also comprises two frames, a plurality of insertion slots opened in the two frames and used for accommodating a plurality of insulating extension ring bodies respectively, a plurality of connecting parts fixed on the inner walls of the insertion slots and used for connecting with the sleeves, a connecting piece fixed in the frame and connected with the connecting part, a clamping groove two opened in the inner wall of the insertion slot and used for accommodating the limiting seat, a clamping groove one opened in one side of the frame and used for accommodating the buckle, and a binding belt bound outside the plurality of heat-conducting protective sleeves.

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