Anti-loosening welding terminal structure of power battery pole

Abstract

The utility model relates to the technical field of battery elements, and discloses an anti-loosening welding terminal structure of a power battery pole, which comprises a battery pole, a counter bore is arranged at the central position of the top end of the battery pole, and a trapezoidal clamping strip and a welding terminal are sequentially connected on the battery pole along the assembly direction; an inner ring groove and two positioning edge grooves are formed in the inner wall of the counter bore, transverse sliding blocks and positioning edge strips are arranged on the two sides of the trapezoidal clamping strip respectively, the two transverse sliding blocks are clamped into the inner ring groove to be used for limiting longitudinal displacement of the trapezoidal clamping strip, and the two positioning edge strips are clamped into the two positioning edge grooves respectively to limit rotation of the trapezoidal clamping strip. According to the utility model, the trapezoidal clamping strip is arranged as a mechanical connection structure between the battery pole and the welding terminal, and the counter bore is formed in the battery pole and used for mounting the trapezoidal clamping strip, so that the trapezoidal clamping strip can longitudinally and circumferentially restrain the welding terminal after being connected with the battery pole.

Description

Technical Field

[0001] This utility model relates to the field of battery element technology, specifically to an anti-loosening welding terminal structure for power battery terminals. Background Technology

[0002] The battery terminals are the core components connecting the battery module to the external circuit. Mechanical structures with auxiliary functions, such as screws and clips, are usually welded onto the battery terminals. The stability of the battery terminals and the various welded terminals directly affects the safety of the battery system during actual use.

[0003] During the production of battery modules, battery terminals are generally integrated with the battery module housing. The metal battery terminals and the plastic battery module housing can be firmly and stably connected with just glue. Since all terminals and battery terminals are made of metal, they are generally connected by simple welding or by clamping the outer periphery of the battery terminals and then tightening them with bolts.

[0004] However, in actual use, under the conditions of frequent charging and discharging of battery modules and vehicle vibration, traditional welded terminals are prone to microcracks due to metal thermal expansion and contraction and stress concentration. The threaded locking structure has the problem of axial stress attenuation when used alone. The failure of both can lead to increased contact resistance, local overheating and even fire risk. Therefore, there is an urgent need for a terminal that can be stably connected to the battery terminal and is not easy to loosen. Utility Model Content

[0005] Therefore, this utility model provides an anti-loosening welding terminal structure for power battery terminals to solve the problem of easy loosening of terminals on battery terminals in the prior art.

[0006] To achieve the above objectives, the embodiments of this utility model provide the following technical solutions:

[0007] A non-loosening welding terminal structure for a power battery terminal includes a battery terminal disposed on the battery, wherein a countersunk hole is provided at the center of the top of the battery terminal, and a trapezoidal retaining strip and a welding terminal are sequentially connected to the battery terminal along the assembly direction through the countersunk hole.

[0008] The inner wall of the countersunk hole is provided with an inner ring groove and two positioning ridge grooves. The trapezoidal retaining strip is provided with a horizontal slider and a positioning ridge on both sides. The trapezoidal retaining strip is installed in the countersunk hole by deforming under pressure on both sides. The two horizontal sliders are inserted into the inner ring groove to limit the longitudinal displacement of the trapezoidal retaining strip. The two positioning ridges are respectively inserted into the two positioning ridge grooves to limit the rotation of the trapezoidal retaining strip.

[0009] The bottom of the welding terminal is provided with a bottom horizontal groove that passes through the welding terminal. The outside of the welding terminal is provided with two inclined grooves that communicate with the bottom horizontal groove. The two ends of the trapezoidal clip can pass through the bottom horizontal groove and extend to the outside of the welding terminal. The two ends of the trapezoidal clip are respectively engaged with the two inclined grooves to fix the welding terminal to the battery terminal.

[0010] In a preferred embodiment of this utility model, the two positioning grooves are located above the inner ring groove, and the bottom ends of the two positioning grooves are connected to the inner ring groove.

[0011] The two positioning ridges are located at the top of the corresponding horizontal slider.

[0012] In a preferred embodiment of this utility model, the width of the portion of the trapezoidal strip that extends into the countersunk hole is consistent with the inner diameter of the countersunk hole.

[0013] As a preferred embodiment of this utility model, the inclined groove is spirally distributed around the outer circumference of the welding terminal, and one end of the inclined groove is connected to the bottom horizontal groove, and the two inclined grooves are symmetrically distributed about the center of the welding terminal.

[0014] In another embodiment of this utility model, the inner sides of both ends of the trapezoidal clip are provided with inclined slide bars for engaging in the inclined grooves. The inclination of the inclined slide bars is consistent with the inclination of the inclined grooves. The two inclined slide bars can slide along the corresponding two inclined grooves to apply downward pressure to the welding terminal to adhere to the battery terminal post.

[0015] The embodiments of this utility model have the following advantages:

[0016] This invention uses a trapezoidal clip as a mechanical connection structure between the battery terminal and the welding terminal. A countersunk hole is made on the battery terminal for installing the trapezoidal clip. After the trapezoidal clip is connected to the battery terminal, it can provide longitudinal and circumferential constraints on the welding terminal, thereby reducing the probability of the welding terminal becoming loose or even falling off during actual use. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 This is a schematic diagram of the overall assembly of the device in the embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the device in the embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the battery terminal in the embodiment of this utility model;

[0022] Figure 4 This is a schematic diagram of the trapezoidal card strip in the embodiment of this utility model.

[0023] In the picture:

[0024] 1-Battery terminal; 2-Trapezoidal clamp; 3-Welding terminal;

[0025] 101-Counterhole; 102-Inner annular groove; 103-Positioning groove;

[0026] 201-Slotted slider; 202-Positioning rib; 203-Angled slider;

[0027] 301 - Bottom horizontal groove; 302 - Inclined groove. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] like Figures 1 to 4 As shown, this embodiment provides an anti-loosening welding terminal structure for a power battery terminal, including a battery terminal 1 disposed on the battery. A countersunk hole 101 is provided at the center of the top of the battery terminal 1. A trapezoidal retaining strip 2 and a welding terminal 3 are sequentially connected to the battery terminal 1 along the assembly direction through the countersunk hole 101.

[0030] Traditional terminal installation methods typically involve directly welding the terminal to the center of the battery terminal 1, or using a clamp-type terminal and bolts to fix it to the outside of the battery terminal 1. Under conditions of frequent battery charging and discharging and vehicle vibration, traditional welded terminals are prone to micro-cracks due to metal thermal expansion and contraction and stress concentration. Threaded locking structures, when used alone, suffer from axial stress attenuation. In this embodiment, a trapezoidal retaining strip 2 is set between the battery terminal 1 and the welding terminal 3 to prevent loosening, and a countersunk hole 101 is made on the battery terminal 1 for installing the trapezoidal retaining strip 2.

[0031] The inner wall of the countersunk hole 101 is provided with an inner ring groove 102 and two positioning ribs 103. The trapezoidal retaining strip 2 is provided with a horizontal slider 201 and a positioning rib 202 on both sides. The trapezoidal retaining strip 2 is installed in the countersunk hole 101 by being compressed on both sides to generate deformation. The two horizontal sliders 201 are inserted into the inner ring groove 102 to limit the longitudinal displacement of the trapezoidal retaining strip 2. The two positioning ribs 202 are respectively inserted into the two positioning ribs 103 to limit the rotation of the trapezoidal retaining strip 2.

[0032] The two positioning grooves 103 are located above the inner ring groove 102, and the bottom ends of the two positioning grooves 103 are connected to the inner ring groove 102.

[0033] The two positioning ribs 202 are located at the top of the corresponding horizontal sliders 201.

[0034] The width of the trapezoidal strip 2 that extends into the countersunk hole 101 is consistent with the inner diameter of the countersunk hole 101.

[0035] Specifically, the trapezoidal locking strip 2 can be deformed inward by applying pressure to its two sides, thereby allowing the trapezoidal locking strip 2 to be inserted into the countersunk hole 101 until the two horizontal sliders 201 on the trapezoidal locking strip 2 are at the same height as the inner annular groove 102 in the countersunk hole 101. Then, the trapezoidal locking strip 2 is rotated until the two positioning ribs 202 are aligned with the two positioning ribs 103 respectively. At this time, the trapezoidal locking strip 2 is released to restore its original shape. At this time, the two slot sliders 201 are engaged in the inner annular groove 102, and the two positioning ribs 103 are engaged in the two positioning ribs 103 respectively.

[0036] In subsequent use, if the trapezoidal clip 2 is subjected to longitudinal pressure, the two slotted sliders 201 engaged in the inner ring groove 102 can provide longitudinal constraint force. If the trapezoidal clip 2 is subjected to circumferential pressure, the two positioning ribs 202 engaged in the two positioning rib grooves 103 can provide circumferential constraint force, so that the trapezoidal clip 2 cannot be dislodged from the countersunk hole 101 of the battery terminal 1 without deformation.

[0037] The bottom of the welding terminal 3 is provided with a bottom horizontal groove 301 that passes through the welding terminal 3 laterally. The outside of the welding terminal 3 is provided with two inclined grooves 302 that communicate with the bottom horizontal groove 301. The two ends of the trapezoidal clip 2 can pass through the bottom horizontal groove 301 and extend to the outside of the welding terminal 3. The two ends of the trapezoidal clip 2 are respectively engaged with the two inclined grooves 302 so that the welding terminal 3 is fixedly attached to the battery terminal 1.

[0038] After the trapezoidal clip 2 is installed, the welding terminal 3 can be installed on the battery terminal 1 and the trapezoidal clip 2. After the welding terminal 3 is connected to the trapezoidal clip 2 and welded to the battery terminal 1, during subsequent testing, the longitudinal and circumferential pressure on the welding terminal 3 will be directly applied to the battery terminal 1 through the trapezoidal clip 2, reducing the stress intensity at the weld between the welding terminal 3 and the battery terminal 1, and effectively reducing the probability of the welding terminal loosening and falling off.

[0039] The trapezoidal clip 2 has inclined slides 203 on the inner sides of both ends for inserting into the inclined groove 302. The inclination of the inclined slides 203 is consistent with the inclination of the inclined groove 302. The two inclined slides 203 can slide along the corresponding two inclined grooves 302 to apply downward pressure to the welding terminal 3 to adhere to the battery pole 1.

[0040] Specifically, during the process of connecting the welding terminal 3 to the mounting strip 2, the bottom horizontal groove 301 at the bottom of the welding terminal 3 is first covered on the horizontal structure at both ends of the trapezoidal mounting strip 2, so that the inclined slides 203 at both ends of the trapezoidal mounting strip 2 are engaged in the corresponding inclined grooves 302. At this time, rotating the welding terminal 3 will allow the two inclined grooves 3002 on the welding terminal 3 to move along the two inclined slides 203. During this process, the trapezoidal mounting strip 2, which cannot be adjusted in the longitudinal position, will apply downward pressure to the welding terminal 3, so that the lower surface of the welding terminal 3 can fully fit the battery terminal 1, which is convenient for subsequent welding of the welding terminal 3. In addition, the two inclined slides 203 located in the two inclined grooves 302 realize the connection between the trapezoidal mounting strip 2 and the welding terminal 3, and the connection strength can also be ensured by welding the two inclined slides 203 in the corresponding inclined grooves 302.

[0041] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A non-loosening welded terminal structure for a power battery terminal, characterized in that, Includes a battery terminal (1) disposed on the battery, wherein a countersunk hole (101) is provided at the center of the top of the battery terminal (1), and a trapezoidal clip (2) and a welding terminal (3) are sequentially connected to the battery terminal (1) along the assembly direction through the countersunk hole (101). The inner wall of the countersunk hole (101) is provided with an inner ring groove (102) and two positioning ridge grooves (103). The trapezoidal clip (2) is provided with a horizontal slider (201) and a positioning ridge (202) on both sides respectively. The trapezoidal clip (2) is installed in the countersunk hole (101) by being compressed on both sides to generate deformation. The two horizontal sliders (201) are inserted into the inner ring groove (102) to limit the longitudinal displacement of the trapezoidal clip (2). The two positioning ridges (202) are respectively inserted into the two positioning ridge grooves (103) to limit the rotation of the trapezoidal clip (2). The bottom of the welding terminal (3) is provided with a bottom horizontal groove (301) that passes through the welding terminal (3) laterally. The outside of the welding terminal (3) is provided with two inclined grooves (302) that communicate with the bottom horizontal groove (301). The two ends of the trapezoidal clip (2) can pass through the bottom horizontal groove (301) and extend to the outside of the welding terminal (3). The two ends of the trapezoidal clip (2) are respectively engaged with the two inclined grooves (302) so that the welding terminal (3) is fixedly attached to the battery terminal (1).

2. The anti-loosening welding terminal structure for a power battery terminal according to claim 1, characterized in that, The two positioning grooves (103) are located above the inner ring groove (102), and the bottom ends of the two positioning grooves (103) are connected to the inner ring groove (102); The two positioning ribs (202) are located at the top of the corresponding horizontal slider (201).

3. The anti-loosening welding terminal structure for a power battery terminal according to claim 1, characterized in that, The width of the portion of the trapezoidal strip (2) that extends into the countersunk hole (101) is consistent with the inner diameter of the countersunk hole (101).

4. The anti-loosening welding terminal structure for a power battery terminal according to claim 1, characterized in that, The inclined groove (302) is spirally distributed around the outer circumference of the welding terminal (3), and one end of the inclined groove (302) is connected to the bottom horizontal groove (301). The two inclined grooves (302) are symmetrically distributed about the center of the welding terminal (3).

5. The anti-loosening welding terminal structure for a power battery terminal according to claim 1, characterized in that, Both ends of the trapezoidal clip (2) are provided with inclined slides (203) for inserting into the inclined groove (302). The inclination of the inclined slides (203) is consistent with the inclination of the inclined groove (302). The two inclined slides (203) slide along the corresponding two inclined grooves (302) to apply downward pressure to the welding terminal (3) to adhere to the battery terminal (1).

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