CN114388992A

CN114388992A - A information acquisition connection structure and laser welding battery module for battery module

Info

Publication number: CN114388992A
Application number: CN202210070260.0A
Authority: CN
Inventors: 苻其登; 张喜龙; 梁铨; 黄金明; 何耀建; 陈礼令
Original assignee: Zhongneng E Power New Energy Technology Co ltd
Current assignee: Zhongneng E Power New Energy Technology Co ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-04-22

Abstract

The invention discloses an information acquisition connecting structure for battery modules, which comprises a busbar and an acquisition terminal, wherein the busbar is used for electrically connecting battery electrodes in a plurality of battery modules, the busbar is provided with a through clamping through hole which is provided with a certain distance from the end edge of the busbar and penetrates through the busbar, the front end of the acquisition terminal is provided with a clamping part, the clamping part is bent downwards to form a clamping hook, the clamping hook can extend into the through clamping through hole and is clamped with the busbar, the inner side of the clamping hook is abutted against the lower surface of the busbar, and the lower surface of the clamping part is abutted against the upper surface of the busbar. Compared with the prior art, the collecting terminal can be clamped on the bus bar in four directions, and when the bus bar and the collecting terminal are welded, a jig is not needed for positioning, so that the cost is saved, and the process is simplified. The invention also discloses a laser welding battery module.

Description

A information acquisition connection structure and laser welding battery module for battery module

Technical Field

The invention relates to the field of battery energy, in particular to a connection structure for information acquisition in a battery module.

Background

In recent years, the new energy industry is rapidly developed, the energy storage field is closely concerned, and in the actual application of electric energy storage, the main fields are renewable energy grid connection, user side, power grid side, auxiliary service and the like in the face of huge market demands and potentials. Monomer battery machine case comprises sheet metal shell, BMS and three major parts of battery module in the lithium cell energy storage, and wherein the battery module can the carrier as the core energy storage, must strictly require safety and quality guarantee at the PACK in-process, and when battery module series-parallel connection is in groups, need set up the signal of telecommunication of information acquisition structure with each electrode in the battery module and carry out, common information acquisition connection structure include with battery electrode welded connection's busbar, with busbar welded connection's collection terminal. When busbar and collection terminal welding, must use supplementary tool to fix a position the collection terminal, when to different products, often need multiple supplementary tool, not only the technology is complicated, and has caused the cost waste.

Therefore, an information collecting and connecting structure and a laser welding battery module that can solve the above problems are urgently needed.

Disclosure of Invention

The invention aims to provide an information acquisition connecting structure for a battery module, which can clamp an acquisition terminal on a bus bar in four directions without a jig, saves cost and simplifies the process.

In order to achieve the purpose, the invention discloses an information acquisition connecting structure for battery modules, which comprises a busbar and an acquisition terminal, wherein the busbar is used for electrically connecting battery electrodes in a plurality of battery modules, the busbar is provided with a through clamping through hole which is arranged at a certain distance from the end edge of the busbar and penetrates through the busbar, the front end of the acquisition terminal is provided with a clamping part, the clamping part is bent downwards to form a clamping hook, the clamping hook can extend into the through clamping through hole and is clamped with the busbar, the inner side of the clamping hook is abutted against the lower surface of the busbar, and the lower surface of the clamping part is abutted against the upper surface of the busbar.

Compared with the prior art, the invention has the advantages that the tail end of the acquisition terminal is provided with the clamping structure which can be clamped with the bus bar, the bus bar is clamped in the first direction and the second direction in the front-back direction and the left-right direction through the matching of the side wall of the clamping hook and the clamping through hole, and the tail end of the clamping hook and the lower surface of the clamping part are clamped in the third direction in the up-down direction, so that the acquisition terminal and the bus bar can be clamped in a limiting manner in the three directions, and when the acquisition terminal is welded with the bus bar, a jig is not needed for fixing the acquisition terminal, so that the cost is saved, and the process is simplified.

Preferably, an elastic structure capable of bending the engaging hook up and down is formed on the hook body of the engaging hook.

Specifically, the elastic structure is an elastic inclined wall inclined relative to the vertical direction, has a simple structure, and can be positioned by matching with the tail end of the clamping hook.

More specifically, the engaging hook includes the elastic inclined wall formed by bending and extending the trim portion downward and inclining forward, and an abutting arm formed by bending and extending the elastic inclined wall forward, and the abutting arm abuts against the lower surface of the busbar.

More specifically, the engaging hook includes the elastic inclined wall formed by bending and extending the engaging portion downward and inclining backward, and an abutting arm formed by bending and extending the elastic inclined wall backward, and the abutting arm abuts against the lower surface of the busbar.

Preferably, the upper surface of the end of the engaging hook is convexly provided with an engaging protrusion, and the upper surface of the busbar is concavely provided with an engaging recess which is concavely and convexly matched with the engaging protrusion.

Preferably, the hook body of the engaging hook faces forward, so that the engaging hook extends into the engaging through hole and then moves forward to engage with the bus bar.

Specifically, the clamping part bends and extends downwards at a certain distance behind the clamping hook to form one or more abutting walls abutting against the tail end edge of the bus bar, and a first clamping area in clamping fit with the bus bar is formed among the abutting walls, the clamping hook and the lower surface of the clamping part.

More specifically, the tail end of the abutting wall is bent forwards and extends to form a matching wall opposite to the lower surface of the bus bar, and a second clamping area in clamping fit with the bus bar is formed between the abutting wall and the matching wall.

Preferably, the bus bar includes a plurality of conductive segments electrically connected to the battery electrodes and a connecting portion connecting the plurality of conductive segments, the connecting portion extends to a terminal edge of the bus bar, and the engaging portion is engaged with the connecting portion.

Specifically, the connecting part extends from the front end of the bus bar to the tail end of the bus bar, and the connecting part is a corrugated structure which is formed between the two conductive slices and can be buffered and deformed

More specifically, the welding surface of the conductive segment is arranged near the tail end of the bus bar, and the thickness of the connecting part is gradually thicker from the tail end to the front end.

More specifically, the upper surface of the connecting portion is convex relative to the upper surface of the conductive segment, and the lower surface of the connecting portion is concave relative to the lower surface of the conductive segment.

The invention also discloses a laser welding battery module, which comprises a plurality of battery cells, a bus bar and an acquisition terminal, wherein the connection structure of the bus bar and the acquisition terminal is the information acquisition connection structure, the bus bar is welded with the electrodes of the battery cells to realize electric connection, and the acquisition terminal is clamped and arranged on the bus bar and is electrically connected.

Drawings

Fig. 1 is a structural view of a laser welding battery module according to the present invention.

Fig. 2 is a view showing a connection structure of a bus bar and a collecting terminal at an angle according to a first embodiment of the present invention.

Fig. 3 is a view showing a connection structure of the bus bar and the collecting terminal at another angle according to the first embodiment of the present invention.

Fig. 4 is an exploded view of a bus bar and a collecting terminal in the first embodiment of the present invention.

Fig. 5 is a perspective sectional view of a bus bar and collecting terminal connecting structure in the first embodiment of the present invention.

Fig. 6 is a structural view of the acquisition terminal in the first embodiment of the present invention.

Fig. 7a is a plan sectional view of a bus bar and collecting terminal connecting structure in the first embodiment of the present invention.

Fig. 7b is a partial enlarged view of fig. 7 a.

Fig. 8 is a view showing a connection structure of a bus bar and a collecting terminal in the second embodiment of the present invention.

Fig. 9 is a view showing a connection structure of a bus bar and a collecting terminal in a third embodiment of the present invention.

Fig. 10 is a view showing a connection structure of a bus bar and a collecting terminal in a fourth embodiment of the present invention.

Fig. 11 is a view showing a connection structure of a bus bar and a collecting terminal in a fifth embodiment of the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

The above-mentioned up-down, front-back, left-right positional relationships are relative positional relationships, and are not limited to the up-down, front-back, left-right, and front-back of the actual product.

Referring to fig. 1, the present invention discloses a laser welding battery module 100, which includes a plurality of battery cells 10, busbars 20 and collecting terminals 30, wherein each busbar 20 is welded to an electrode of the battery cell 10 to achieve electrical connection so as to collect electrical signals of the battery cell 10, and the collecting terminals 30 extend into the busbars 20 and are electrically connected to the busbars 20, and transmit the electrical signals at the busbars 20.

Referring to fig. 2 to 4, the bus bar 20 includes a plurality of conductive segments 21 electrically connected to the electrodes of the battery cells 10, and a connection portion 22 connecting the plurality of conductive segments 21, and the connection portion 22 extends to an end edge of the bus bar 20.

In this embodiment, the connecting portion 22 extends from the front end of the bus bar 20 to the tail end of the bus bar 20, and the connecting portion 22 is a corrugated structure capable of buffering and deforming and is formed between the two conductive segments, and is used for buffering the two conductive segments 21 and providing a deformation moving area.

Referring to fig. 7a, the welding surface of the conductive segment 21 is disposed adjacent to the end of the bus bar 20, and the thickness of the connecting portion 22 is gradually thicker from the end to the front end.

Referring to fig. 2 to 4, an upper surface of the connecting portion 22 is protruded from an upper surface of the conductive segment 21, and a lower surface of the connecting portion 22 is recessed from a lower surface of the conductive segment 21, so that a groove 224 is formed at the connecting portion 22 on the lower surface of the bus bar 20, thereby forming a corrugated structure. This recess 224 is close to the terminal trough surface of busbar 20 and is the horizontal plane for joint acquisition terminal 30, and the other part of recess 224 is from the preceding slope trough surface that slopes down gradually (thicken gradually) forward, under the prerequisite that provides sufficient buffer interval to electrically conductive sub-sheet 21, increases busbar 20's excessive flow.

Referring to fig. 2 to 7b, a through hole 221 is formed in the bus bar 20 and penetrates through the bus bar 20, the end of the collecting terminal 30 has a wiring portion 31 electrically connected to an external wire, the front end of the collecting terminal 30 has a fastening portion 32 fastened to the bus bar 20, the fastening portion 32 is bent downward to form a fastening hook 321, the fastening hook 321 can extend into the through hole 221 and is fastened to the bus bar 20, the inner side of the fastening hook 321 abuts against the lower surface of the bus bar 20, and the lower surface of the fastening portion 32 abuts against the upper surface of the bus bar 20.

In this embodiment, the fastening portion 32 is fastened to the connecting portion 22, and of course, a fixing portion different from the connecting portion 22 may be provided on the bus bar to fasten the fastening portion 32.

Referring to fig. 6 and 7b, an elastic structure for bending the engaging hook 321 up and down is formed on the body of the engaging hook 321. In this embodiment, the elastic structure is an elastic inclined wall 3211 inclined with respect to the vertical direction, and the elastic structure is simple and can be positioned by matching with the end of the engaging hook 321. Of course, the elastic structure is not limited to the present embodiment, and may be a bent arm, a corrugated structure, or the like.

Referring to fig. 6 and 7b, the engaging hook 321 includes the elastic inclined wall 3211 formed by bending and extending the trim portion 32 downward and tilting forward, and an abutting arm 3212 formed by bending and extending the elastic inclined wall 3211 forward, and the abutting arm 3212 abuts against the lower surface of the busbar 20. In this embodiment, the body of the engaging hook 321 faces forward, so that the engaging hook 321 extends into the engaging through hole 221 and moves forward to engage with the bus bar 20.

Preferably, the fixing portion 32 is bent downward at a position of a certain distance behind the engaging hook 321 to form one or more abutting walls 3221 abutting against the end edge of the bus bar 20, a fastening block 222 is formed between the engaging through hole 221 and the end edge of the bus bar, and a first engaging region 41 engaged with the fastening block 222 is formed among the abutting walls 3221, the engaging hook 321 and the lower surface of the fixing portion 32.

More specifically, the end of the abutting wall 3221 is bent forward and extends to form a matching wall 3222 opposite to the lower surface of the busbar 20, a second engaging region 42 in snap fit with the busbar 20 is formed between the abutting wall 3221 and the matching wall 3222, and the end of the busbar 20 is engaged in the second engaging region 42. In the hook-shaped area of the engaging hook 321, a third engaging area 43 engaged with the bus bar 20 is formed, and in the present embodiment, the front side hole wall of the engaging through hole 221 and the connecting portion 22 are engaged with the third engaging area 43.

In this embodiment, the bus bar 20 and the collecting terminal 30 are both formed by punching conductive materials. The collecting terminal 30 is made of a conductive metal material with an elastic end, such as a steel sheet, but the collecting terminal 30 may also be made of other conductive materials, and the engaging hook 321 needs to have certain elasticity.

Referring to fig. 8, a second embodiment of the present invention is different from the first embodiment, in this embodiment, an upper surface of a distal end of the engaging hook 321 is convexly provided with an engaging protrusion 3213, and an upper surface of the busbar 20 is concavely provided with an engaging recess 23 that is concavely and convexly matched with the engaging protrusion 3213. The engaging protrusion 2313 is formed on an inner surface of the abutting arm 3212 facing the bus bar 20. This structure allows the collecting terminal 30 and the bus bar 20 to be accurately positioned in the front-rear direction.

Referring to fig. 9, a third embodiment of the present invention is different from the above-mentioned embodiments, in this embodiment, a corrugated structure 3214 (curved arm) is formed on the elastically inclined wall 3211, which effectively increases the amount of deformation of the engaging hook 321 in bending in the vertical direction, so that the engaging hook 321 can be inserted into the engaging through hole 221 and engaged with the busbar 20.

Referring to fig. 10, a fourth embodiment of the present invention is different from the first embodiment, in this embodiment, the engaging hook 321 ' includes the elastic inclined wall 3211 ' formed by bending and extending the trim portion 32 backward and tilting forward, and an abutting arm 3212 ' formed by bending and extending a distal end of the elastic inclined wall 3211 ' backward, and the abutting arm 3212 ' abuts against a lower surface of the busbar 20. This scheme makes whole card portion 32 be a hook form, simple structure, and is with low costs.

Preferably, the upper surface of the end of the engaging hook 321' is convexly provided with an engaging protrusion 3213, and the upper surface of the busbar 20 is concavely provided with an engaging recess 23 which is concavely and convexly matched with the engaging protrusion 3213. The engaging protrusion 2313 is formed on an inner surface of the abutting arm 3212' facing the bus bar 20. This structure allows the collecting terminal 30 and the bus bar 20 to be accurately positioned in the front-rear direction.

Referring to fig. 11, a fifth embodiment of the present invention is different from the fourth embodiment, in this embodiment, a corrugated structure 3214 '(bent arm) is formed on the elastically inclined wall 3211', which effectively increases the amount of deformation of the engaging hook 321 in bending in the vertical direction, so that the engaging hook 321 can be inserted into the engaging through hole 221 and engaged with the busbar 20.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims

1. The utility model provides an information acquisition connection structure for battery module which characterized in that: the collecting terminal comprises a bus bar and a collecting terminal, wherein the bus bar is used for electrically connecting battery electrodes in a plurality of battery modules, a clamping through hole which has a certain distance and runs through with the tail end edge of the bus bar is arranged on the bus bar, a clamping part is arranged at the front end of the collecting terminal, a clamping hook is formed by downwards bending the clamping part, the clamping hook can extend into the clamping through hole and is clamped with the bus bar, the inner side of the clamping hook is abutted against the lower surface of the bus bar, and the lower surface of the clamping part is abutted against the upper surface of the bus bar.

2. The information acquisition connection structure as set forth in claim 1, wherein: the hook body of the clamping hook is provided with an elastic structure which can enable the clamping hook to be bent up and down.

3. The information acquisition connection structure according to claim 2, wherein: the elastic structure is an elastic inclined wall inclined relative to the up-down direction.

4. The information acquisition connection structure according to claim 3, wherein: the clamping hook comprises an elastic inclined wall formed by bending and extending the clamping part downwards and inclining forwards, and a butting arm formed by bending and extending the elastic inclined wall forwards, wherein the butting arm is abutted against the lower surface of the busbar; alternatively, the first and second electrodes may be,

the clamping hook comprises an elastic inclined wall formed by bending and extending the clamping part downwards and inclining backwards at the same time, and a butting arm formed by bending and extending the elastic inclined wall backwards, wherein the butting arm is abutted against the lower surface of the busbar.

5. The information acquisition connection structure as set forth in claim 1, wherein: the upper surface of the tail end of the clamping hook is convexly provided with a clamping protrusion, and the upper surface of the busbar is concavely arranged in a clamping concave pit which is in concave-convex fit with the clamping protrusion.

6. The information acquisition connection structure as set forth in claim 1, wherein: the hook body of the clamping hook faces the front, so that the clamping hook extends into the clamping through hole and then moves forwards to be clamped with the bus bar.

7. The information acquisition connection structure as set forth in claim 6, wherein: the clamping part bends and extends downwards at a certain distance from the rear side of the clamping hook to form one or more abutting walls abutting against the tail end edge of the bus bar, and a first clamping area in clamping fit with the bus bar is formed among the abutting walls, the clamping hook and the lower surface of the clamping part.

8. The information acquisition connection structure as set forth in claim 7, wherein: the tail end of the abutting wall is bent forwards and extends to form a matching wall opposite to the lower surface of the bus bar, and a second clamping area in clamping fit with the bus bar is formed between the abutting wall and the matching wall.

9. The information acquisition connection structure as set forth in claim 1, wherein: the bus bar comprises a plurality of conductive fragments and a plurality of connecting parts, wherein the conductive fragments are electrically connected with the battery electrodes, the connecting parts are connected with the conductive fragments, the connecting parts extend to the tail end edge of the bus bar, and the clamping parts are clamped with the connecting parts.

10. The information acquisition connection structure as set forth in claim 9, wherein: the connecting part extends from the front end of the bus bar to the tail end of the bus bar, and the connecting part is of a corrugated structure which can be buffered and deformed and is formed between the two conductive slicing pieces.

11. The information acquisition connection structure as set forth in claim 10, wherein: the welding surface of the conductive slicing piece is arranged close to the tail end of the bus bar, and the thickness of the connecting part is gradually increased from the tail end to the front end.

12. The information acquisition connection structure as set forth in claim 10, wherein: the upper surface of the connecting part is protruded on the upper surface of the conductive slicing piece, and the lower surface of the connecting part is recessed on the lower surface of the conductive slicing piece.

13. The utility model provides a laser welding battery module which characterized in that: the information acquisition and connection structure comprises a plurality of battery cells, a bus bar and an acquisition terminal, wherein the bus bar and the acquisition terminal are connected through the information acquisition and connection structure according to any one of claims 1 to 12, the bus bar is welded with electrodes of the battery cells to realize electric connection, and the acquisition terminal is clamped and mounted on the bus bar and is electrically connected.