CN217507582U

CN217507582U - Bus bar in battery module and laser welding battery module

Info

Publication number: CN217507582U
Application number: CN202220166154.8U
Authority: CN
Inventors: 苻其登; 张喜龙; 梁铨; 黄金明; 何耀建; 王达盛
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: 2022-09-27
Anticipated expiration: 2032-01-21

Abstract

The utility model discloses a busbar in battery module, body that converges including integrated into one piece, the body that converges includes a plurality of electrically conductive burst and connects a plurality ofly electrically conductive burst's connecting portion, electrically conductive burst is located with concave including the electrically conductive body that has first predetermined thickness electrically conductive body upper surface's face of weld, the face of weld department electrically conductive burst's thickness is predetermined for the second, the second is predetermined thickness and is less than first predetermined thickness, electrically conductive burst lower surface with the position that the face of weld corresponds is used for connecting the electrode of battery electricity core, the face of weld is used for cooperating the welding machine to weld. Compared with the prior art, the utility model discloses the regional thickness in face of weld place is less than the thickness of other electrically conductive burst on the busbar, can be so that the busbar of different models, and thickness in face of weld department is unified, can use the welding machine of constant power to weld the busbar, solves different laser welding equipment power limited problem, compatibility good.

Description

Bus bar in battery module and laser welding battery module

Technical Field

The utility model relates to a battery energy field especially relates to a busbar and welded structure for among 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 is by the panel beating shell in the lithium cell energy storage, BMS and three major parts of battery module are constituteed, wherein the battery module is as the carrier of can discharging of core energy storage, must strictly require safety and quality guarantee at the PACK in-process, and battery module series-parallel connection is unitized key technology exactly is laser welding, for compatible different products, different product overcurrent capacity is different promptly, the face of weld cross-section thickness of busbar is different, and different products need make many money auxiliary fixtures when leading to connecting the acquisition terminal, the laser machine that needs different power welds, the cost that causes is extravagant.

Referring to chinese patent document CN211350786U, a bus bar used in an existing battery module is often a welding sheet with a uniform thickness, and during laser welding, a laser machine matched with the thickness of the welding sheet or a welding machine with different powers must be used to weld, and when welding bus bars of different models, the welding power of the laser machine needs to be adjusted or the laser machine needs to be replaced, which not only causes cost waste, but also affects welding efficiency.

Therefore, a bus bar and a laser welding battery module that can solve the above problems are urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a busbar and laser welding battery module among battery module, its busbar is compatible good, applicable in the welding machine of constant power.

In order to realize the above-mentioned purpose, the utility model discloses a busbar in battery module, the body that converges including integrated into one piece, the body that converges includes a plurality of electrically conductive burst and connects a plurality ofly electrically conductive burst's connecting portion, electrically conductive burst is located including the electrically conductive body that has first predetermined thickness and concave the face of weld of electrically conductive body upper surface, the face of weld department the thickness of electrically conductive burst is predetermined thickness for the second, the second is predetermined thickness and is less than first predetermined thickness, electrically conductive burst lower surface with the position that the face of weld corresponds is used for connecting the electrode of battery electricity core, the face of weld is used for cooperating the welding machine to weld.

Compared with the prior art, the utility model discloses the regional thickness in face of weld place is less than the thickness of other electrically conductive burst on the busbar, can be so that the busbar of different models, in the thickness of face of weld department is unified, can use the welding machine of constant power to weld the busbar in face of weld department, especially very thick at busbar thickness, when laser welding equipment power is limited, can adopt this busbar, solve different laser welding equipment power limited problem. When the busbar needs heavy current, the thickness of the conductive parts can be thickened as required, the overcurrent capacity of the busbar is not influenced, and the consistency and the compatibility are good.

Preferably, the lower surface of the conductive segment is a planar structure matched with the electrode of the battery cell. And the welding fixture is convenient to place on an electrode of a battery cell for welding.

Preferably, the welding surface and the conductive body are stepped or have gradually higher inclined edges.

Preferably, the bus body is integrally stamped.

The conductive fragments are arranged in parallel at a certain interval, and the connecting part is formed between the two conductive fragments. Of course, the number of conductive segments is not limited to two, and the specific number depends on the number of battery cells to be reflowed in the busbar.

Specifically, the welding face extends to the front end of the conductive body, the connecting portion are located the thickness of the front end of the conductive body is equal to the second preset thickness, the connecting portion are located the thickness of the tail end of the conductive body is equal to the first preset thickness, the connecting portion are located a slant edge is formed between the front end and the rear end of the conductive body, and the scheme enables the connecting portion and the collecting terminal to be welded through a welding machine of the same model.

Specifically, the upper surface height of connecting portion is higher than the upper surface of electrically conductive body, the lower surface height of connecting portion is less than the lower surface of electrically conductive body to make connecting portion locate for concave the mounting groove of electrically conductive burst lower surface, be formed with on the joint groove with acquisition terminal joint complex block structure. Of course, the mounting groove may also be a mounting groove concavely disposed on the upper surface of the conductive segment, or may also be maintained in a state of equal height with the conductive segment.

Preferably, the mounting groove is provided with a clamping hole matched with the acquisition terminal in a clamping manner, so that when the battery module is assembled, the bus bar can be directly clamped with the acquisition terminal without fixture positioning.

Preferably, the mounting groove includes close to the terminal joint groove that sets up trough surface isotachy of electrically conductive body and be formed at the joint groove with between the electrically conductive body front end and the trough surface connection groove of tilt up gradually.

The utility model also discloses a laser welding battery module, including a plurality of battery electricity cores, busbar and collection terminal, the busbar be as above the busbar, the busbar with the electrode welding of battery electricity core is connected in order to realize the electricity, the collection terminal install in connect on the connecting portion and the electricity is connected.

Preferably, the connecting portion includes a clip groove recessed on the lower surface of the bus bar and extending to the edge of the end of the bus bar, a through clamping hole is arranged on the clamping groove, a clamping part is formed between the clamping hole and the edge of the tail end of the bus bar, the collecting terminal comprises a wiring part and a fixing part clamped and connected with the clamping groove, the front end of the fixing part is bent upwards to form a main clamping arm which can extend into the clamping groove from the tail end of the bus bar forwards, the front end of the main clamping arm is bent and forms a first clamping area clamped with the clamping groove, the fixed part is convexly provided with a secondary clamping arm which has a certain distance with the main clamping arm and can be matched with the front side wall of the clamping groove, the front end of the secondary clamping arm is bent and forms a second clamping area clamped with the groove surface of the clamping groove, and a third clamping area clamped with the clamping part is formed between the main clamping arm and the secondary clamping arm. The block is stable, need not the tool location during the welding.

Drawings

Fig. 1 is a perspective view of an angle of the upper surface of the bus bar of the present invention.

Fig. 2 is a perspective view of another angle of the upper surface of the bus bar of the present invention.

Fig. 3 is a perspective view of the lower surface of the bus bar of the present invention.

Fig. 4 is a side view of the bus bar of the present invention.

Fig. 5 is a sectional view of the bus bar of the present invention.

Fig. 6 is a structural diagram of the laser welding battery module of the present invention.

Fig. 7 is a connection diagram of the bus bar and the collecting terminal according to the present invention.

Fig. 8 is an exploded view of the bus bar and the collection terminal of the present invention.

Fig. 9 is a sectional view of the bus bar and the collecting terminal according to the present invention.

Fig. 10 is a cross-sectional view of the acquisition terminal 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 description is given in conjunction with the embodiments and the accompanying drawings.

Referring to fig. 6, the utility model discloses a laser welding battery module 100, including a plurality of battery electricity cores 10, busbar 20 and collection terminal 30, each busbar 20 with the electrode welding of battery electricity core 10 is connected in order to realize the electricity, in order to gather the signal of telecommunication of battery electricity core 10, collection terminal 30 stretches into busbar 20 department and with busbar 20 electricity is connected, and will the signal of telecommunication of busbar 20 department is carried out.

Referring to fig. 1 to 5, the busbar 20 includes an integrally formed busbar body, the busbar body includes a plurality of conductive segments 21 and a connecting portion 22 connecting the conductive segments, the conductive segments 21 include a conductive body 211 having a first preset thickness and a welding surface 212 concavely disposed on an upper surface of the conductive body 211 and welded to an electrode of the battery cell 10, a thickness of the conductive segment 21 at the welding surface 212 is a second preset thickness, the second preset thickness is smaller than the first preset thickness, and a lower surface of the conductive segment 21 is a planar structure and is used for electrically connecting the battery cell 10.

The lower surface of the conductive segment is in a shape matched with the electrode of the battery cell 10, and is not limited to a planar structure. The lower surface of the conductive segment 21 is connected to an electrode of the battery cell 10 at a position corresponding to the welding surface 212, and the welding surface 212 is used for being matched with a welding machine for welding.

In this embodiment, the welding surface 212 extends to the front end of the conductive body 211 and is rectangular, but the welding surface 212 may also be located in the middle of the conductive body 211, and the shape thereof is not limited to the rectangle.

Referring to fig. 1 and 4, in the present embodiment, the welding surface 212 and the conductive body 211 are stepped. Of course, the welding surface 212 and the conductive body 211 may have an inclined edge that gradually increases.

Wherein the bus bar body (bus bar 20) is integrally punched.

The number of the conductive segments 21 is two, and the conductive segments are arranged in parallel at a certain interval, and the connecting portion 22 is formed between the two conductive segments 21. Of course, the number of the conductive segments 21 is not limited to two, and the specific number depends on the number of the battery cells 10 to be reflowed by the bus bar 20.

In this embodiment, the connection portion 22 is formed with a corrugated groove to buffer positions between different conductive segments 21, so as to prevent the conductive segments from breaking the welding with the battery cell 10 due to heating or cooling of the battery cell 10. Of course, the connection portion 22 may be only a connection portion connecting different conductive segments.

In this embodiment, the connecting portion 22 is also used for mounting the collecting terminal 30 and electrically connecting with the collecting terminal 30. Wherein the acquisition terminal 30 is inserted into and welded to the connection portion 22.

Referring to fig. 1, 2 and 4, the welding surface 212 extends to the front end of the conductive body 211, referring to fig. 2 and 3, the thickness of the connecting portion 22 at the front end of the conductive body 211 is equal to a second predetermined thickness, the thickness of the connecting portion 22 at the end of the conductive body 211 is equal to a first predetermined thickness, and referring to fig. 5, the connecting portion 22 forms an inclined edge between the front end and the rear end of the conductive body 211.

Referring to fig. 1 to 3, the height of the upper surface of the connecting portion 22 is higher than that of the upper surface of the conductive body 211, and the height of the lower surface of the connecting portion 22 is lower than that of the lower surface of the conductive body 211, so that the connecting portion 22 is a mounting groove 22 concavely formed on the lower surface of the conductive segment 21.

Referring to fig. 5, the mounting groove 22 includes a catching groove 221 having a groove surface with an equal height adjacent to the end of the conductive body 211 and a connecting groove 222 formed between the catching groove 221 and the front end of the conductive body 211 and having a groove surface gradually inclined upward. The collecting terminal 30 extends into the mounting groove 22 and is connected with the mounting groove 22 in a clamping mode, jig positioning is not needed, and welding can be directly conducted. In this embodiment, the groove bottom thickness of the clamping groove 212 is a second predetermined thickness.

Referring to fig. 5 and 9, the connecting portion 22 includes a clamping groove 221 concavely disposed on the lower surface of the bus bar 20 and extending to the edge of the end of the bus bar 20, a through clamping hole 2211 is disposed on the clamping groove 221, and a clamping portion 2212 is formed between the clamping hole 2211 and the edge of the end of the bus bar 20.

Referring to fig. 7 to 10, acquisition terminal 30 include wiring portion 31 and with the fixed part 32 that joint groove 221 block is connected, the front end of fixed part 32 upwards buckles in order to form and can follow busbar 20 is terminal to be stretched into forward the main joint arm 321 of joint groove 221, the front end of main joint arm 321 is the form of buckling and forms and follows the preceding lateral wall of joint hole 2211 stretches out and with the first block district 41 of joint groove 221 slot surface joint, fixed part 32 upwards be equipped with main joint arm 321 have a determining deviation and can with the sub-joint arm 322 of the preceding lateral wall complex of joint groove 221, the front end of sub-joint arm 322 be the form of buckling and form with the second block district 42 of the slot surface joint of joint groove 221, still be formed between main joint arm 321 and the sub-joint arm 322 with the third block district 43 of joint portion 2212 joint.

The specific steps for assembling the laser welded battery module 100 are as follows:

(1) providing the battery cell 10, designing the thickness of the bus bar 20 according to the overcurrent carrying capacity of the battery cell 10, and designing the thickness of the conductive segment 21 at the welding surface 212 according to a constant power welding machine for welding, so as to obtain a first preset thickness and a second preset thickness;

(2) obtaining a metal sheet with a first preset thickness, stamping the welding surface 212 to obtain a connecting part 22 and a conductive sliced sheet 21, and enabling the thickness of the conductive sliced sheet 21 at the welding surface 212 to be a second preset thickness, so as to manufacture the bus bar 20;

(3) arranging battery cells 10 in a battery box, arranging solder at corresponding positions of electrodes of the battery cells 10 or the welding surface 212 of the busbar 20, mounting the busbar 20 on the battery cells 10 and fixing the busbar by using a jig, and welding the welding surface 212 by using a welding machine to electrically connect the conductive slices 21 with the electrodes of the battery cells 10;

(4) providing the collecting terminal 30, fixing the collecting terminal 30 at the connecting part 22 and welding with a welding machine.

Specifically, step (4) is to set solder at a corresponding position of the acquisition terminal 30 and/or the connection portion 22, clamp the acquisition terminal 30 to the connection portion 22, and weld the acquisition terminal to the welding portion 22 by using a welding machine.

The sequence of the steps (3) and (4) may be changed, or after the collecting terminal 30 is clamped, the bus bar 20 clamped with the collecting terminal 30 is mounted on the battery cell 10, and a welding machine is used to weld the upper surface of the connecting portion 22 and the welding surface 212 together.

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 invention, therefore, the invention is not limited thereto.

Claims

1. The utility model provides a busbar in battery module which characterized in that: the electric current collecting body comprises an integrally formed collecting body, the collecting body comprises a plurality of electric conduction fragments and is connected in a plurality of connecting parts of the electric conduction fragments, the electric conduction fragments comprise electric conduction bodies with first preset thicknesses and welding faces concavely arranged on the upper surfaces of the electric conduction bodies, the welding faces are located at the positions of the thickness of the electric conduction fragments are preset thicknesses of the second, the second preset thicknesses are smaller than the first preset thicknesses, the lower surfaces of the electric conduction fragments and the positions corresponding to the welding faces are used for connecting electrodes of battery cells, and the welding faces are used for being matched with a welding machine to be welded.

2. The bus bar in a battery module according to claim 1, wherein: the lower surface of the conductive sub-sheet is of a plane structure matched with the electrode of the battery cell.

3. The bus bar in a battery module according to claim 1, wherein: the welding surface and the conductive body are in a step shape or are provided with inclined edges which gradually become higher.

4. The bus bar in a battery module according to claim 1, wherein: the confluence body is integrally formed by stamping.

5. The bus bar in a battery module according to claim 1, wherein: the conductive slicing pieces are arranged in parallel at a certain interval, and the connecting part is formed between the two conductive slicing pieces.

6. The bus bar in a battery module according to claim 5, wherein: the welding face extends to the tail end of the conductive body, the thickness of the connecting portion, which is located at the tail end of the conductive body, is equal to the second preset thickness, the thickness of the connecting portion, which is located at the front end of the conductive body, is equal to the first preset thickness, and a slant edge is formed between the front end and the rear end of the conductive body.

7. The bus bar in a battery module according to claim 5, wherein: the upper surface height of connecting portion is higher than the upper surface of electrically conductive body, the lower surface height of connecting portion is less than the lower surface of electrically conductive body to make connecting portion be for the concave mounting groove of locating electrically conductive burst lower surface.

8. The bus bar in a battery module according to claim 7, wherein: the mounting groove comprises a clamping groove which is close to the tail end of the conductive body and has the same height as the groove surface, and a connecting groove which is formed between the clamping groove and the front end of the conductive body and has the groove surface inclined upwards gradually, wherein a clamping structure matched with the acquisition terminal in a clamping manner is formed on the clamping groove.

9. The utility model provides a laser welding battery module which characterized in that: the battery comprises a plurality of battery cells, a bus bar and a collection terminal, wherein the bus bar is the bus bar in any one of claims 1 to 8, the bus bar is welded with electrodes of the battery cells to realize electric connection, and the collection terminal is installed on the connecting part and is electrically connected.

10. The laser-welded battery module according to claim 9, wherein: the connecting part comprises a clamping groove which is concavely arranged on the lower surface of the bus bar and extends to the edge of the tail end of the bus bar, a through clamping hole is arranged on the clamping groove, a clamping part is formed between the clamping hole and the edge of the tail end of the busbar, the collecting terminal comprises a wiring part and a fixing part clamped and connected with the clamping groove, the front end of the fixing part is bent upwards to form a main clamping arm which can extend into the clamping groove from the tail end of the bus bar forwards, the front end of the main clamping arm is bent and forms a first clamping area clamped with the clamping groove, the fixed part is convexly provided with a secondary clamping arm which has a certain distance with the main clamping arm and can be matched with the front side wall of the clamping groove, the front end of the secondary clamping arm is bent and forms a second clamping area clamped with the groove surface of the clamping groove, and a third clamping area clamped with the clamping part is formed between the main clamping arm and the secondary clamping arm.