Wiring terminal structure of lithium battery pack

Abstract

The utility model discloses a wiring terminal structure of a lithium battery pack, and aims to provide a wiring terminal structure of a lithium battery pack, which is favorable for improving the qualified rate of products and comprises a terminal body, the locking piece is detachably connected with the terminal body; and the connecting cable is inserted into the end part of the terminal body and is electrically connected with the terminal body after being fixed by the locking piece. The battery fixing device has the beneficial effects that tin soldering is replaced by a locking and fixing mode of the locking piece, so that various bad problems caused by the tin soldering are avoided, the quality of the battery is favorably improved, and the purpose of favorably improving the product percent of pass is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery wiring terminal related technical field, especially point to a kind of wiring terminal structure of lithium battery pack. BACKGROUND

[0002] Box type lithium battery pack is the battery system that multiple lithium battery monomers are combined in a box body. It has wide application in multiple fields: energy storage field, such as 1.5MWh container type large-scale energy storage system, can be used for the conversion, storage and discharge of renewable energy such as hydroelectricity, wind power and solar energy, which is compared by the industry as large-scale power bank;Ship field, ship box type power lithium battery module is used as a kind of efficient, reliable and lightweight power supply solution, which can improve the efficiency and stability of ship power system, and is suitable for various complex ship environments;New energy vehicle field: there is lithium battery PACK combined box structure for new energy vehicle, to provide power for automobile.

[0003] In the prior art, the wiring terminal at the shell is usually fixedly connected with the cable on the box type lithium battery pack by tin soldering, and welding will produce metal chips, which will cause battery short circuit. In addition, poor welding will cause appearance defects such as black explosion point and heating, which will cause tin melting and make the welding point separate, which reduces the qualified rate after welding, and welding in the shell is inconvenient, especially for thicker connecting cable. UTILITY MODEL CONTENTS

[0004] The utility model discloses to overcome the insufficient that wiring terminal and cable tin soldering make product qualified rate reduce in prior art, provide a kind of wiring terminal structure of lithium battery pack for improving product qualified rate.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A wiring terminal structure of lithium battery pack, comprising:

[0007] A terminal body;

[0008] A locking member, detachably connected to the terminal body;

[0009] A connecting cable, inserted into the end portion of the terminal body, and electrically connected to the terminal body after being fixed by the locking member.

[0010] The lithium battery pack is inserted into the end portion of the terminal body by the connecting cable, and the connecting cable is locked by the locking member, so that it is fixed in the terminal body and electrically connected to the terminal body. The locking and fixing mode of the locking member replaces tin soldering, which avoids various problems caused by tin soldering, thereby improving the quality of the battery and achieving the purpose of improving the product qualified rate. At the same time, the fixing operation convenience of the terminal body and the cable is improved.

[0011] Preferably, the connecting cable includes an insulating sheath and several conductive metal wires. Each conductive metal wire is encased and fixed within the insulating sheath. The ends of the conductive metal wires extend outwards from the end of the insulating sheath. After the connecting cable is inserted into the end of the terminal body, a locking device presses the ends of the conductive metal wires outside the insulating sheath to secure and electrically connect them to the terminal body. The extension of the conductive metal wires outside the insulating sheath facilitates the locking device's fixation within the terminal body and electrical connection. Therefore, in this invention, fixing the connecting cable to the terminal body only requires assembling the connecting cable and terminal body into place and then locking them with the locking device. This is convenient to operate, easy to install and disassemble, and convenient for maintenance.

[0012] Preferably, one end of the terminal body is provided with a limiting groove that matches the end of the insulating outer sheath. The bottom center of the limiting groove is provided with a socket that matches a plurality of conductive metal wires. The terminal body is provided with a locking cavity. One end of the locking cavity is connected to the socket. The other end of the locking cavity is provided with a threaded hole that matches a locking member. The other end of the terminal body is provided with a connecting groove. The threaded hole is located at the bottom center of the connecting groove. The locking member is threadedly connected to the threaded hole. The outer diameter of the locking member is larger than the inner diameter of the socket and smaller than the inner diameter of the locking cavity. After the connecting cable is inserted into one end of the terminal body, its end is limited in the limiting groove by the insulating outer sheath. The plurality of conductive metal wires pass through the socket and are tightened inward by the locking member. The plurality of conductive metal wires are distributed outward from the locking member as the center and are pressed and fixed on the side wall of the locking cavity that is connected to the socket and electrically connected to the terminal body. The opening end of the limiting groove and the opening end of the connecting groove are respectively located on the two end faces of the terminal body. In the initial state, several conductive metal wires are bundled together. When the connecting cable is connected to the terminal body, the conductive metal wires pass through the limiting groove and the socket in sequence and are located in the locking cavity. At this time, the insulating outer sheath is limited in the limiting groove to prevent the conductive metal wires from being exposed, which helps to improve safety performance and the service life of the conductive metal wires. Then, the operator tightens the locking part inward at the end of the connecting groove, pressing and fixing the conductive metal wires located in the locking cavity to the side wall of the end of the locking cavity that is connected to the socket. The operation is convenient and quick.

[0013] Preferably, the end face of the locking cavity connected to the insertion hole is shaped like a flared mouth opening outward from the insertion hole towards the threaded hole. One end of the locking member is located inside the locking cavity and its edge is provided with a guide slope. The guide slope matches and fits the flared end face of the locking cavity. Several conductive metal wires are pressed and fixed to the side wall of the locking cavity connected to the insertion hole by the guide slope under the drive of the locking member and are electrically connected to the terminal body. The other end of the locking member is located inside the bottom of the connecting groove and is provided with a cross groove. The operator uses a tool to insert the locking element into the cross groove of the connecting slot and tightens it inward. The locking element is inserted into the center of a bundle of conductive metal wires through a guide bevel, dispersing the conductive metal wires in all directions and pressing them firmly against the end face of the funnel-shaped locking cavity. Therefore, the design of the guide bevel facilitates both the dispersion of the conductive metal wires and the pressing of the dispersed conductive metal wires against the end face of the locking cavity, ensuring a tight fit and fixation while preventing scratches on the surface of the conductive metal wires. This provides better protection for the conductive metal wires and helps extend their service life. The connecting slot is used for connecting external circuits.

[0014] Preferably, the terminal body includes a mounting base and a conductive metal body. The mounting base has a through hole at its center that matches the conductive metal body. The conductive metal body is located within the through hole and is fixedly connected to the mounting base through the through hole. The limiting groove is located at one end of the conductive metal body, and the connecting groove is located at the other end of the conductive metal body. The locking cavity and locking element are both located within the conductive metal body. Several conductive metal wires, driven by the locking element, are pressed and fixed to the side wall of the locking cavity that connects to the insertion hole through a guide slope and are electrically connected to the conductive metal body. The mounting base is an insulator, which helps to prevent the battery casing from becoming electrified and improves safety. The limiting groove, connecting groove, locking cavity, and locking element are all located on the conductive metal body, so that when the locking element presses and fixes several conductive metal wires to the end face of the locking cavity, it simultaneously achieves the fixation and electrical connection between the connecting cable and the terminal body, and at the same time, it achieves electrical connection with the external circuit through the connecting groove.

[0015] Preferably, the mounting base has fixing holes at both ends, and bolts are installed in the fixing holes. The conductive metal body is detachably connected to the battery casing through the mounting base, further improving the convenience of maintenance of the terminal body.

[0016] The beneficial effects of this utility model are:

[0017] 1. The use of locking components to fix the battery instead of soldering avoids various problems caused by soldering, thereby improving battery quality and achieving the goal of increasing product qualification rate. At the same time, it improves the convenience of fixing the terminal body and cable.

[0018] 2. The design of the guide slope on the locking component facilitates the spreading of several conductive metal wires and presses the spread conductive metal wires tightly against the end face of the locking cavity, ensuring a tight fit and fixation while preventing scratches on the surface of the conductive metal wires. This provides better protection for the conductive metal wires and helps extend their service life. Attached Figure Description

[0019] Figure 1 and Figure 2 These are all schematic diagrams of the structure of this utility model;

[0020] Figure 3 yes Figure 2 Sectional view of AA.

[0021] In the diagram: 1. Terminal body, 2. Locking element, 3. Connecting cable, 4. Insulating outer sheath, 5. Conductive metal wire, 6. Limiting groove, 7. Insertion hole, 8. Locking cavity, 9. Threaded hole, 10. Connecting groove, 11. Guide slope, 12. Cross groove, 13. Mounting base, 14. Conductive metal body, 15. Fixing hole. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “upper,” “lower,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “below” other elements or features would be fixed “upper” to other elements or features. Thus, the exemplary term “lower” can include both upper and lower orientations. The device may be fixed in other ways (rotated 90 degrees or located in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0026] like Figure 1 , Figure 2 and Figure 3 In the embodiments described, a terminal structure for a lithium battery pack includes a terminal body 1; a locking member 2, which is detachably connected to the terminal body 1; and a connecting cable 3, which is inserted into the end of the terminal body 1 and is electrically connected to the terminal body 1 after being fixed by the locking member 2.

[0027] The connecting cable 3 includes an insulating outer sheath 4 and several conductive metal wires 5. The conductive metal wires 5 are all wrapped and fixed inside the insulating outer sheath 4. The ends of the conductive metal wires 5 extend outward from the ends of the insulating outer sheath 4. After the connecting cable 3 is inserted into the end of the terminal body 1, the locking member 2 presses the ends of the conductive metal wires 5 located outside the insulating outer sheath 4 to achieve a fixed connection and electrical connection with the terminal body 1.

[0028] One end of the terminal body 1 is provided with a limiting groove 6 that matches the end of the insulating outer sheath 4. The bottom center of the limiting groove 6 is provided with a socket 7 that matches several conductive metal wires 5. The terminal body 1 is provided with a locking cavity 8. One end of the locking cavity 8 is connected to the socket 7. The other end of the locking cavity 8 is provided with a threaded hole 9 that matches the locking member 2. The other end of the terminal body 1 is provided with a connecting groove 10. The threaded hole 9 is located at the bottom center of the connecting groove 10. The locking member 2 is threadedly connected to the threaded hole 9. The outer diameter of the locking member 2 is larger than the socket. The inner diameter of 7 is smaller than the inner diameter of the locking cavity 8. After the connecting cable 3 is inserted into one end of the terminal body 1, its end is limited in the limiting groove 6 by the insulating outer sheath 4. Several conductive metal wires 5 pass through the insertion hole 7 and are tightened inward by the locking member 2. Several conductive metal wires 5 are distributed around the locking member 2 and pressed and fixed on the side wall of the locking cavity 8 connected to the insertion hole 7 and electrically connected to the terminal body 1. The opening end of the limiting groove 6 and the opening end of the connecting groove 10 are located on the two end faces of the terminal body 1, respectively.

[0029] The end face of the locking cavity 8 connected to the insertion hole 7 is shaped like a flared mouth opening outward from the insertion hole 7 toward the threaded hole 9. One end of the locking member 2 is located inside the locking cavity 8 and its edge is provided with a guide slope 11. The guide slope 11 matches and fits the flared end face of the locking cavity 8. Several conductive metal wires 5 are pressed and fixed to the side wall of the locking cavity 8 connected to the insertion hole 7 by the guide slope 11 under the drive of the locking member 2 and are electrically connected to the terminal body 1. The other end of the locking member 2 is located in the bottom of the connecting groove 10 and is provided with a cross groove 12.

[0030] The terminal body 1 includes a mounting base 13 and a conductive metal body 14. The center of the mounting base 13 is provided with a through hole that matches the conductive metal body 14. The conductive metal body 14 is located in the through hole and is fixedly connected to the mounting base 13 through the through hole. The limiting groove 6 is located at one end of the conductive metal body 14, and the connecting groove 10 is located at the other end of the conductive metal body 14. The locking cavity 8 and the locking member 2 are both located in the conductive metal body 14. Several conductive metal wires 5 are pressed and fixed to the side wall of the locking cavity 8 that is connected to the insertion hole 7 by the guide inclined surface 11 under the drive of the locking member 2 and are electrically connected to the conductive metal body 14.

[0031] The mounting base 16 has fixing holes 15 at both ends, and bolts are installed in the fixing holes 15.

[0032] In the initial state, several conductive metal wires 14 are bundled together. When the lithium battery pack is connected to the terminal body 1 via the connecting cable 3, the several conductive metal wires 14 pass through the limiting groove 6 and the insertion hole 7 in sequence and are located in the locking cavity 8. At this time, the insulating outer sheath 4 is limited within the limiting groove 6 to prevent the conductive metal wires 14 from being exposed, which is beneficial to improving safety performance and the service life of the conductive metal wires 14. Then, the operator inserts a tool into the cross groove 12 of the locking member 2 at the end of the connecting groove 10 and tightens the locking member 2 inward. The locking member 2 is inserted into the center of the bundle of several conductive metal wires 14 through the guide inclined surface 11, which disperses the several conductive metal wires 14 in all directions and presses and fixes them on the end face of the flared locking cavity 8. At the same time, the connection cable 3 is fixed and electrically connected to the terminal body 1, and electrically connected to the external circuit through the connecting groove 10.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A terminal structure for a lithium battery pack, characterized in that, include: Terminal body (1); The locking element (2) is detachably connected to the terminal body (1); The connecting cable (3) is inserted into the end of the terminal body (1) and is electrically connected to the terminal body (1) after being fixed by the locking member (2).

2. The terminal structure of a lithium battery pack according to claim 1, characterized in that, The connecting cable (3) includes an insulating outer sheath (4) and several conductive metal wires (5). The several conductive metal wires (5) are all wrapped and fixed inside the insulating outer sheath (4). The ends of the conductive metal wires (5) extend outward from the ends of the insulating outer sheath (4) to the outside of the insulating outer sheath (4). After the connecting cable (3) is inserted into the end of the terminal body (1), the locking member (2) presses the ends of the several conductive metal wires (5) located outside the insulating outer sheath (4) to make a fixed connection and electrical connection with the terminal body (1).

3. The terminal structure of a lithium battery pack according to claim 2, characterized in that, One end of the terminal body (1) is provided with a limiting groove (6) that matches the end of the insulating outer sheath (4). The bottom center of the limiting groove (6) is provided with a socket (7) that matches a plurality of conductive metal wires (5). The terminal body (1) is provided with a locking cavity (8). One end of the locking cavity (8) is connected to the socket (7). The other end of the locking cavity (8) is provided with a threaded hole (9) that matches the locking member (2). The other end of the terminal body (1) is provided with a connecting groove (10). The threaded hole (9) is located at the bottom center of the connecting groove (10). The locking member (2) is threadedly connected to the threaded hole (9). (2) The outer diameter is greater than the inner diameter of the socket (7) and less than the inner diameter of the locking cavity (8). After the connecting cable (3) is inserted into one end of the terminal body (1), its end is limited in the limiting groove (6) by the insulating outer sheath (4). Several conductive metal wires (5) pass through the socket (7) and are tightened inward by the locking member (2). Several conductive metal wires (5) are dispersed around the locking member (2) and pressed and fixed on the side wall of the locking cavity (8) connected to the socket (7) and electrically connected to the terminal body (1). The opening end of the limiting groove (6) and the opening end of the connecting groove (10) are located on the two end faces of the terminal body (1).

4. The terminal structure of a lithium battery pack according to claim 3, characterized in that, The end face of the locking cavity (8) connected to the insertion hole (7) is shaped like a flared mouth opening outward from the insertion hole (7) toward the threaded hole (9). One end of the locking member (2) is located inside the locking cavity (8) and its edge is provided with a guide slope (11). The guide slope (11) matches and fits the flared end face of the locking cavity (8). Several conductive metal wires (5) are pressed and fixed to the side wall of the locking cavity (8) connected to the insertion hole (7) by the guide slope (11) under the drive of the locking member (2) and are electrically connected to the terminal body (1). The other end of the locking member (2) is located inside the bottom of the connecting groove (10) and is provided with a cross groove (12).

5. A terminal structure for a lithium battery pack according to claim 3 or 4, characterized in that, The terminal body (1) includes a mounting base (13) and a conductive metal body (14). The center of the mounting base (13) is provided with a through hole that matches the conductive metal body (14). The conductive metal body (14) is located in the through hole and is fixedly connected to the mounting base (13) through the through hole. The limiting groove (6) is located at one end of the conductive metal body (14), and the connecting groove (10) is located at the other end of the conductive metal body (14). The locking cavity (8) and the locking member (2) are both located in the conductive metal body (14). Several conductive metal wires (5) are pressed and fixed on the side wall of the locking cavity (8) connected to the insertion hole (7) by the guide inclined surface (11) under the drive of the locking member (2) and are electrically connected to the conductive metal body (14).

6. The terminal structure of a lithium battery pack according to claim 5, characterized in that, The mounting base (13) has fixing holes (15) at both ends, and bolts are installed in the fixing holes (15).

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