Information acquisition connection structure for battery module and laser-welded battery module

Abstract

The application discloses a kind of information acquisition connecting structure for battery module, including busbar and acquisition terminal, the busbar is used to electrically connect the battery electrode in multiple battery modules, the busbar is provided with and with its end edge a certain distance and through the clamping through-hole, the front end of the acquisition terminal has clamping part, the clamping part is bent downward and is formed with clamping hook, the clamping hook can extend into the clamping through-hole and is clamped with the busbar, the inside of the clamping hook is in contact with the lower surface of the busbar, and the lower surface of the clamping part is in contact with the upper surface of the busbar.Compared with prior art, the application can clamp the acquisition terminal on the busbar in four directions, and when the busbar and the acquisition terminal are welded, no jig positioning is required, cost is saved, and the process is simplified.The application also discloses a laser-welded battery module.

Description

Technical Field

[0001] This invention relates to the field of battery energy, and more particularly to a connection structure for information acquisition in a battery module. Background Technology

[0002] The new energy industry has developed rapidly in recent years, and the energy storage field has been closely watched. Faced with huge market demand and potential, the main applications of power energy storage are in renewable energy grid connection, user-side, grid-side, and ancillary services. In lithium battery energy storage, a single battery enclosure consists of three main parts: a sheet metal shell, a BMS (Battery Management System), and the battery module. The battery module, as the core energy storage and discharging carrier, must be subject to strict safety and quality assurance during the PACK process. When battery modules are connected in series and parallel, an information acquisition structure is needed to transmit the electrical signals from each electrode in the battery module. Common information acquisition connection structures include busbars welded to the battery electrodes and acquisition terminals welded to the busbars. During the welding of the busbars and acquisition terminals, auxiliary fixtures must be used to position the acquisition terminals. For different products, multiple auxiliary fixtures are often required, which not only complicates the process but also wastes costs.

[0003] Therefore, there is an urgent need for an information acquisition and connection structure and a laser welding battery module that can solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an information acquisition connection structure for battery modules, which can snap the acquisition terminals onto the busbar in four directions without the need for fixtures, thus saving costs and simplifying the process.

[0005] To achieve the above objectives, the present invention discloses an information acquisition and connection structure for a battery module, including a busbar and acquisition terminals. The busbar is used to electrically connect battery electrodes in multiple battery modules. The busbar is provided with a through-hole that is a certain distance from its end edge and penetrates through it. The front end of the acquisition terminal has a locking part, which is bent downward to form a locking hook. The locking hook can extend into the through-hole and engage with the busbar. The inner side of the locking hook abuts against the lower surface of the busbar, and the lower surface of the locking part abuts against the upper surface of the busbar.

[0006] Compared with the prior art, the present invention has a snap-fit ​​structure at the end of the acquisition terminal that can snap into the busbar. The busbar achieves snap-fit ​​in the first and second directions in the front-back and left-right directions by the cooperation of the side wall of the snap-fit ​​hook with the snap-fit ​​through hole. In the vertical direction, the snap-fit ​​is achieved in the third direction by the end of the snap-fit ​​hook with the lower surface of the locking part. Thus, the acquisition terminal and the busbar can be snap-fitted in three directions. When welding the acquisition terminal and the busbar, there is no need for a fixture to fix the acquisition terminal, saving costs and simplifying the process.

[0007] Preferably, the hook body of the locking hook has an elastic structure that allows the locking hook to bend up and down.

[0008] Specifically, the elastic structure is an elastic inclined wall that is inclined relative to the vertical direction. It has a simple structure and can be positioned in conjunction with the end of the locking hook.

[0009] More specifically, the locking hook includes an elastic inclined wall formed by bending downward and extending downward from the locking portion while tilting forward, and an abutting arm formed by bending forward from the elastic inclined wall, the abutting arm abutting against the lower surface of the manifold.

[0010] More specifically, the locking hook includes an elastic inclined wall formed by bending downward and extending downward from the locking portion while tilting backward, and an abutting arm formed by bending backward from the elastic inclined wall, the abutting arm abutting against the lower surface of the manifold.

[0011] Preferably, the upper surface of the end of the engaging hook is provided with an engaging protrusion, and the upper surface of the busbar is recessed in an engaging recess that engages with the engaging protrusion.

[0012] Preferably, the hook body of the engaging hook faces forward, so that the engaging hook extends into the engaging through hole and moves forward to engage with the busbar.

[0013] Specifically, the locking part bends downward at a certain distance behind the locking hook to form one or more contact walls that abut against the end edge of the busbar. A first engagement area is formed between the contact wall, the locking hook and the lower surface of the locking part to engage with the busbar.

[0014] More specifically, the end of the abutting wall bends forward and extends to form a mating wall opposite to the lower surface of the busbar, and a second engaging area is formed between the abutting wall and the mating wall to engage with the busbar.

[0015] Preferably, the busbar 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 extending to the end edge of the busbar, and the locking portion engaging with the connecting portion.

[0016] Specifically, the connecting portion extends from the front end of the busbar to the end of the busbar, and the connecting portion is a deformable, pleated structure formed between the two conductive segments.

[0017] More specifically, the welding face of the conductive segment is located near the end of the busbar, and the thickness of the connection gradually increases from the end to the front.

[0018] More specifically, the upper surface of the connecting portion protrudes from the upper surface of the conductive segment, and the lower surface of the connecting portion is recessed from the lower surface of the conductive segment.

[0019] The present invention also discloses a laser-welded battery module, comprising a plurality of battery cells, a busbar and a data acquisition terminal. The connection structure between the busbar and the data acquisition terminal is the information acquisition connection structure described above. The busbar is welded to the electrodes of the battery cells to achieve electrical connection. The data acquisition terminal is snapped onto the busbar and electrically connected. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the laser-welded battery module of the present invention.

[0021] Figure 2 This is a connection structure diagram of the busbar and the acquisition terminal at one angle in the first embodiment of the present invention.

[0022] Figure 3 This is a connection structure diagram of the bus and the acquisition terminal from another angle in the first embodiment of the present invention.

[0023] Figure 4 This is an exploded view of the bus and acquisition terminal in the first embodiment of the present invention.

[0024] Figure 5 This is a three-dimensional sectional view of the connection structure between the bus and the acquisition terminal in the first embodiment of the present invention.

[0025] Figure 6 This is a structural diagram of the acquisition terminal in the first embodiment of the present invention.

[0026] Figure 7a This is a planar sectional view of the connection structure between the bus and the acquisition terminal in the first embodiment of the present invention.

[0027] Figure 7b yes Figure 7a A magnified view of a portion of the image.

[0028] Figure 8 This is a connection structure diagram of the bus and the acquisition terminal in the second embodiment of the present invention.

[0029] Figure 9 This is a connection structure diagram of the bus and the acquisition terminal in the third embodiment of the present invention.

[0030] Figure 10 This is a connection structure diagram of the bus and the acquisition terminal in the fourth embodiment of the present invention.

[0031] Figure 11 This is a connection structure diagram of the bus and the acquisition terminal in the fifth embodiment of the present invention. Detailed Implementation

[0032] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0033] The up-down, front-back, and left-right positional relationships mentioned in this invention are relative positional relationships and are not limited to the up-down, front-back, and left-right positions of the actual product.

[0034] refer to Figure 1 This invention discloses a laser-welded battery module 100, comprising a plurality of battery cells 10, a busbar 20, and a data acquisition terminal 30. Each busbar 20 is welded to the electrode of the battery cell 10 to achieve electrical connection, so as to acquire the electrical signal of the battery cell 10. The data acquisition terminal 30 extends into the busbar 20 and is electrically connected to the busbar 20, and transmits the electrical signal at the busbar 20.

[0035] refer to Figures 2 to 4 The busbar 20 includes a plurality of conductive segments 21 electrically connected to the electrodes of the battery cell 10 and a connecting portion 22 connecting the plurality of conductive segments 21, the connecting portion 22 extending to the end edge of the busbar 20.

[0036] In this embodiment, the connecting portion 22 extends from the front end of the busbar 20 to the end end of the busbar 20, and the connecting portion 22 is a pleated structure formed between the two conductive segments to buffer deformation, which is used to buffer the two conductive segments 21 and provide a deformation movement area.

[0037] refer to Figure 7a The welding face of the conductive segment 21 is located near the end of the busbar 20, and the thickness of the connecting portion 22 gradually increases from the end to the front.

[0038] refer to Figures 2 to 4 The upper surface of the connecting portion 22 protrudes from the upper surface of the conductive segment 21, and the lower surface of the connecting portion 22 is recessed into the lower surface of the conductive segment 21, thereby forming a groove 224 at the connecting portion 22 on the lower surface of the busbar 20, thus forming a pleated structure. The groove surface of the groove 224 near the end of the busbar 20 is a horizontal surface, used to snap the acquisition terminal 30. The other part of the groove 224 is an inclined groove surface that gradually slopes downward (gradually thickens) from back to front, increasing the flow rate of the busbar 20 while providing sufficient buffer space for the conductive segment 21.

[0039] refer to Figures 2 to 7bThe busbar 20 is provided with a through hole 221 that is a certain distance from and penetrates the busbar 20. The end of the acquisition terminal 30 has a wiring part 31 that is electrically connected to an external wire. The front end of the acquisition terminal 30 has a locking part 32 that is snapped into the busbar 20. The locking part 32 is bent downward to form a locking hook 321. The locking hook 321 can extend into the through hole 221 and engage with the busbar 20. The inner side of the locking hook 321 abuts against the lower surface of the busbar 20, and the lower surface of the locking part 32 abuts against the upper surface of the busbar 20.

[0040] In this embodiment, the locking part 32 is locked to the connecting part 22. Of course, a fixing part different from the connecting part 22 can also be provided on the busbar for locking the locking part 32.

[0041] refer to Figure 6 and Figure 7b The hook body of the locking hook 321 has an elastic structure that allows the locking hook 321 to bend vertically. In this embodiment, the elastic structure is an elastic inclined wall 3211 that is inclined relative to the vertical direction. The structure is simple and can be used to position the end of the locking hook 321. Of course, the elastic structure is not limited to this embodiment and can also be a bent arm, a curved arm, a pleated structure, etc.

[0042] refer to Figure 6 and 7b The engaging hook 321 includes an elastic inclined wall 3211 formed by bending downward and extending from the locking part 32 while tilting forward, and an abutting arm 3212 formed by bending forward from the elastic inclined wall 3211. The abutting arm 3212 abuts against the lower surface of the manifold 20. In this embodiment, the hook 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 manifold 20.

[0043] Preferably, the locking part 32 bends downward at a certain distance behind the locking hook 321 to form one or more contact walls 3221 that abut against the end edge of the busbar 20. A locking block 222 is formed between the locking through hole 221 and the end edge of the busbar. A first engagement area 41 that engages with the locking block 222 is formed between the contact wall 3221, the locking hook 321 and the lower surface of the locking part 32.

[0044] More specifically, the end of the abutment wall 3221 bends forward to form a mating wall 3222 opposite to the lower surface of the busbar 20. A second engagement area 42 is formed between the abutment wall 3221 and the mating wall 3222 to engage with the busbar 20, and the end of the busbar 20 is engaged in the second engagement area 42. A third engagement area 43 is formed in the hook-shaped region of the engagement hook 321 to engage with the busbar 20. In this embodiment, the front wall of the engagement through hole 221 and the connecting portion 22 are engaged in the third engagement area 43.

[0045] In this embodiment, both the busbar 20 and the acquisition terminal 30 are stamped from conductive materials. The acquisition terminal 30 is stamped from a conductive metal material with an elastic end, such as a steel sheet. Of course, the acquisition terminal 30 can also be made of other conductive materials, and its locking hook 321 needs to have a certain degree of elasticity.

[0046] refer to Figure 8 This is a second embodiment of the present invention, different from the first embodiment. In this embodiment, the upper surface of the end of the engaging hook 321 has an engaging protrusion 3213, and the upper surface of the busbar 20 is recessed in an engaging recess 23 that mates with the engaging protrusion 3213. The engaging protrusion 2313 is formed on the inner surface of the abutment arm 3212 facing the busbar 20. This structure allows for precise positioning of the acquisition terminal 30 and the busbar 20 in the front-back direction.

[0047] refer to Figure 9 This is the third embodiment of the present invention. Unlike the above embodiments, in this embodiment, a pleated structure 3214 (bent arm) is formed on the elastic inclined wall 3211, which effectively increases the deformation of the locking hook 321 in the vertical direction, making it easier for the locking hook 321 to be inserted into the locking through hole 221 and engage with the busbar 20.

[0048] refer to Figure 10 This is the fourth embodiment of the present invention, which differs from the first embodiment. In this embodiment, the locking hook 321' includes an elastic inclined wall 3211' formed by bending backward and extending backward from the locking part 32 while tilting forward, and an abutment arm 3212' formed by bending backward from the end of the elastic inclined wall 3211'. The abutment arm 3212' abuts against the lower surface of the busbar 20. This design makes the entire locking part 32 hook-shaped, with a simple structure and low cost.

[0049] Preferably, the upper surface of the end of the engaging hook 321' is provided with an engaging protrusion 3213, and the upper surface of the busbar 20 is recessed in an engaging recess 23 that mates with the engaging protrusion 3213. The engaging protrusion 2313 is formed on the inner surface of the abutment arm 3212' facing the busbar 20. This structure allows for precise positioning of the acquisition terminal 30 and the busbar 20 in the front-rear direction.

[0050] refer to Figure 11 This is the fifth embodiment of the present invention. Unlike the fourth embodiment, in this embodiment, a pleated structure 3214' (bent arm) is formed on the elastic inclined wall 3211', which effectively increases the deformation of the locking hook 321 in the vertical direction, making it easier for the locking hook 321 to be inserted into the locking through hole 221 and engage with the busbar 20.

[0051] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An information acquisition connection structure for a battery module, characterized by: The busbar is used for electrically connecting the battery electrodes in the plurality of battery modules, and the busbar is provided with a clamping through hole at a distance from the end edge and penetrating through the busbar. The front end of the collection terminal has a clamping part, and the clamping part is downwardly bent to form a clamping hook. The hook body of the clamping hook faces forward or backward and can extend into the clamping through hole and be clamped with the busbar. The inner side of the clamping hook is in contact with the lower surface of the busbar. The lower surface of the clamping part is in contact with the upper surface of the busbar. The busbar includes a plurality of conductive segments electrically connected with the battery electrodes and a connecting part connecting the plurality of conductive segments. The connecting part extends to the end edge of the busbar. The clamping part is clamped with the connecting part. The connecting part extends from the front end of the busbar to the end edge of the busbar. The welding surface of the conductive segment is arranged near the end edge of the busbar. The upper surface of the connecting part is convex to the upper surface of the conductive segment. The lower surface of the connecting part is concave to the lower surface of the conductive segment, so as to form a groove at the connecting part of the lower surface of the busbar, thereby forming a wrinkle structure. The groove surface near the end edge of the busbar is a horizontal surface for clamping the collection terminal. Other parts of the groove are inclined grooves gradually downward from back to front, so that the thickness of the connecting part gradually increases from the end edge to the front end. When the hook body of the clamping hook faces forward, the clamping hook moves forward after extending into the clamping through hole to be clamped with the busbar. The clamping part is downwardly bent and extended at a distance behind the clamping hook to form one or more contact walls in contact with the end edge of the busbar. The contact wall, the clamping hook and the lower surface of the clamping part form a first clamping area for clamping with the busbar. The end of the contact wall is bent and extended forward to form a matching wall opposite to the lower surface of the busbar. The contact wall and the matching wall form a second clamping area for clamping with the busbar. When the hook body of the clamping hook faces backward, the clamping hook includes an elastic inclined wall formed by the clamping part being downwardly bent and extended while being inclined backward, and an abutting arm formed by the elastic inclined wall being bent and extended backward. The abutting arm is in contact with the lower surface of the busbar.

2. The information gathering connection structure of claim 1, wherein: The hook body of the clamping hook is formed with an elastic structure for bending the clamping hook upward and downward.

3. The information gathering connection structure of claim 2, wherein: The elastic structure is an elastic inclined wall inclined relative to the upward and downward directions.

4. The information gathering connection structure of claim 3, wherein: When the hook body of the clamping hook faces forward, the clamping hook includes the elastic inclined wall formed by the clamping part being downwardly bent and extended while being inclined forward, and the abutting arm formed by the elastic inclined wall being bent and extended forward. The abutting arm is in contact with the lower surface of the busbar.

5. The information gathering connection structure of claim 1, wherein: The upper surface of the end of the clamping hook is convexly provided with a clamping protrusion. The upper surface of the busbar is concavely provided with a clamping pit in concave-convex cooperation with the clamping protrusion.

6. A laser-welded battery module, characterized by: The battery includes a plurality of battery cells, busbars, and collection terminals, the connection structure of the busbars and the collection terminals is the information collection connection structure as claimed in any one of claims 1-5, the busbars are welded with the electrodes of the battery cells to achieve electrical connection, and the collection terminals are snap-fitted on the busbars and electrically connected.

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