A series-parallel welding-free structure for soft-pack battery tabs

Abstract

The present invention provides a series-parallel welding-free structure for connecting tabs of soft-pack batteries, comprising battery cells arranged in sequence to form a soft-pack battery pack, each of the battery cells being provided with a positive tab and a negative tab at one end; an adapter plate disposed at one end of the soft-pack battery pack provided with a positive tab and a negative tab, the positive tab and the negative tab both being passed through electrode vias on the adapter plate and being closely attached to the adapter plate; a connection circuit being provided on the adapter plate for connecting the positive tab and the negative tab closely attached to the adapter plate in series and parallel; and a pressing assembly being detachably disposed on the upper end surface of the adapter plate in sequence and capable of pressing the positive tab and the negative tab closely attached to the adapter plate. This solves the problem of how to use a welding-free structure to complete the series-parallel connection between tabs and an adapter plate in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a series-parallel welding-free structure for soft-pack battery tabs. Background Art

[0002] Batteries are divided into three types: cylindrical, square, and soft-pack. Cylindrical and square batteries can be completely recycled by locking with screws. However, soft-pack tabs cannot be locked to achieve complete battery recycling. When disassembling, the tabs need to be cut off to remove the battery, which makes it impossible to reuse them in a cascade manner.

[0003] Existing soft-pack battery tabs and adapter plates are typically connected via laser welding. However, laser welding has the disadvantages of over-welding and cold welds, both of which are critical for new energy battery packs. Cold welds increase internal resistance, causing heat buildup at the tabs and potentially leading to combustion. Over-welding can also cause the laser energy to penetrate the substrate, damaging the battery pack and causing leakage. Developing a weld-free structure to achieve series-parallel connections between the tabs and adapter plates is a pressing technical challenge for soft-pack batteries. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a series-parallel welding-free structure for the tabs of a soft-pack battery, thereby solving the problem in the prior art of how to use a welding-free structure to complete the series-parallel connection between the tabs and the adapter plate.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A soft-pack battery tab series-parallel welding-free structure, battery cells, the battery cells are arranged in sequence to form a soft-pack battery pack, and one end of each battery cell is provided with a positive electrode tab and a negative electrode tab;

[0007] An adapter plate, the adapter plate is arranged at one end of the soft-pack battery pack with a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are both passed through the electrode via holes on the adapter plate and closely attached to the adapter plate, and the adapter plate is provided with a connection circuit that can connect the positive electrode tab and the negative electrode tab closely attached to the adapter plate in series and parallel;

[0008] The pressing assembly is detachably arranged on the upper end surface of the adapter plate in sequence, and the pressing assembly can press the positive electrode tab and the negative electrode tab tightly attached to the adapter plate.

[0009] Furthermore, the clamping assembly includes a clamping base, which is detachably mounted on the upper end surface of the adapter plate. A metal pressing plate is provided at one end of the clamping base facing the adapter plate. Several threaded through holes are evenly arranged on the clamping base, and each of the threaded through holes is threadedly connected to a clamping bolt, which can pass through the threaded through hole and be clamped on the upper end surface of the metal pressing plate.

[0010] Furthermore, a fastener cover plate can be detachably mounted on the upper end surface of each of the buckling bases, and a number of limit buckles are evenly arranged on one end of the fastener cover plate facing the buckling base. A limit hole adapted to the limit buckle is opened on the upper end of the clamping bolt, and the limit buckles can be aligned and embedded in the limit hole in sequence.

[0011] Furthermore, both ends of the short side of the pressing base are provided with an anti-slip buckle, and the anti-slip buckle can be embedded in the anti-slip hole on the adapter plate and buckled on the adapter plate.

[0012] Furthermore, a limiting plate is provided at both ends of the long side of the pressing base, and the limiting plate can be embedded in the electrode through-hole on the adapter plate. The cross-section of the limiting plate is arc-shaped, and the limiting plate can press the tab in the electrode through-hole.

[0013] Furthermore, irregular convex points are provided on one end surface of the metal pressing sheet facing the tab.

[0014] Furthermore, a reinforcing plate is provided at both ends of the outer side of the pressing base, and screw holes are opened on the reinforcing plate. Plastic screws are driven into the screw holes, and the plastic screws are fixed to the adapter plate through the screw holes.

[0015] Furthermore, the limiting hole on the clamping bolt is evenly provided with several limiting grooves along its circumference, and the limiting buckle is evenly provided with several limiting ribs matched with the limiting grooves along its circumference. When the limiting buckle is embedded in the limiting hole, the limiting ribs can be respectively embedded in the limiting grooves.

[0016] The present invention can be implemented by fixing the adapter plate to one end of the soft-pack battery pack where the pole ear is provided, and then the pole ear on the battery cell is passed through the electrode through-hole on the adapter plate in sequence, and then the pole ear is bent so that the positive pole ear and the negative pole ear are bent and attached to the upper end surface of the adapter plate, and then the buckling base is aligned and fixed to the adapter plate, and finally a clamping bolt is driven into the threaded through-hole on the buckling base, and the clamping bolt compresses the metal pressing plate, and the metal pressing plate plays a clamping role between the positive pole ear and the negative pole ear and the adapter plate, thereby ensuring the stability of the connection between the pole ear and the adapter plate, thereby eliminating the original welding structure between the pole ear and the adapter plate, effectively preventing over-welding and cold welding during laser welding, and ensuring the safety of the battery pack. Moreover, the pole ear and the adapter plate are connected by crimping, which can also facilitate the disassembly of the battery pack during the subsequent battery recycling process without cutting the pole ear, and can achieve cascade utilization, thereby ensuring the recycling efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the adapter plate in the present invention;

[0019] Figure 3 It is an exploded view of the structure of the buckling assembly in the present invention;

[0020] Figure 4 Schematic diagram of the structure of the buckling base in the present invention;

[0021] Figure 5 It is a schematic cross-sectional view of the assembly structure of the buckling assembly in the present invention;

[0022] Figure 6 Schematic diagram of the assembly structure between the limit buckle and the clamping bolt in the present invention;

[0023] Figure 7 for Figure 6 Detailed diagram of the structure at A in the middle;

[0024] Figure 8 Schematic diagram of the structure of the battery cell in the present invention;

[0025] Figure 9 Schematic diagram of the structure of the soft pack battery pack of the present invention;

[0026] In the figure: 1. Soft-pack battery pack; 11. Battery cell; 12. Positive electrode tab; 13. Negative electrode tab; 2. Adapter plate; 21. Electrode via; 22. Anti-drop hole; 3. Buckling assembly; 31. Buckling base; 32. Metal pressing sheet; 33. Threaded through hole; 34. Clamping bolt; 35. Fastener cover; 36. Limit buckle; 37. Limit hole; 38. Anti-drop buckle; 39. Limit plate; 4. Reinforcement plate; 5. Limit groove; 6. Limit rib. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below with reference to the accompanying drawings. Specific embodiment 1

[0029] A soft-pack battery tab series-parallel welding-free structure, comprising: battery cells 11, the battery cells 11 are arranged in sequence to form a soft-pack battery pack 1, and one end of each battery cell 11 is provided with a positive electrode tab 12 and a negative electrode tab 13;

[0030] The adapter plate 2 is provided at one end of the soft-pack battery pack 1 where the positive electrode tab 12 and the negative electrode tab 13 are provided. The positive electrode tab 12 and the negative electrode tab 13 are both passed through the electrode via 21 on the adapter plate 2 and are closely attached to the adapter plate 2. The adapter plate 2 is provided with a connection circuit that can connect the positive electrode tab 12 and the negative electrode tab 13 closely attached to the adapter plate 2 in series and parallel;

[0031] The pressing assembly 3 is detachably mounted on the upper end surface of the adapter plate 2 and can press the positive electrode tab 12 and the negative electrode tab 13 that are attached to the adapter plate 2;

[0032] The clamping assembly 3 includes a clamping base 31, which is detachably mounted on the upper end surface of the adapter plate 2. A metal pressing plate 32 is provided at one end of the clamping base 31 facing the adapter plate 2. Several threaded through holes 33 are evenly arranged on the clamping base 31. A clamping bolt 34 is threadedly connected in each of the threaded through holes 33. The clamping bolt 34 can pass through the threaded through hole 33 and be clamped on the upper end surface of the metal pressing plate 32.

[0033] In this embodiment, the tabs on the battery cell 11 can be passed through the electrode through-holes 21 on the adapter plate 2 in sequence, and then the tabs can be bent so that the positive tab 12 and the negative tab 13 are bent and attached to the upper end surface of the adapter plate 2, and the lower end surface of the adapter plate 2 is pressed against the side surface of the battery cell 11. Then, the pressing base 31 is aligned and fixed to the adapter plate 2, and finally, the clamping bolt 34 is driven into the threaded through-hole 33 on the clamping base 31. The clamping bolt 34 presses the metal pressing plate 32, and the metal pressing plate 32 plays a pressing role between the positive tab 12 and the negative tab 13 and the adapter plate 2, thereby ensuring the stability of the connection between the tabs and the adapter plate 2. Specific embodiment 2

[0035] The difference between this embodiment and the first embodiment is that this embodiment further includes the following technical features: a fastener cover plate 35 is detachably mounted on the upper end surface of each of the buckling bases 31, and a plurality of limit buckles 36 are evenly arranged on one end of the fastener cover plate 35 facing the buckling base 31. The upper end of each of the clamping bolts 34 is provided with a limit hole 37 adapted to the limit buckle 36, and the limit buckles 36 can be aligned and embedded in the limit holes 37 in sequence;

[0036] The limiting hole 37 on the clamping bolt 34 is evenly provided with several limiting grooves 5 along its circumference, and the limiting buckle 36 is evenly provided with several limiting ribs 6 that are compatible with the limiting grooves 5 along its circumference. When the limiting buckle 36 is embedded in the limiting hole 37, the limiting ribs 6 can be respectively embedded in the limiting grooves 5.

[0037] This embodiment can be provided with a fastener cover plate 35 adapted to the buckling base 31 on the basis of Example 1, and a limit buckle 36 is provided at one end of the fastener cover plate 35. The limit buckle 36 can be embedded in the limit hole 37 on the clamping bolt 34, and the limit buckle 36 and the limit hole 37 are further provided with a matching limit rib 6 and a limit groove 5. This embodiment can clamp the clamping bolt 34 through the limit buckle 36 to prevent the clamping bolt 34 from loosening, and the design of the limit rib 6 and the limit groove 5 can also effectively prevent the clamping bolt 34 from rotating under vibration conditions, thereby ensuring the stability of the clamping bolt 34, and continuously compressing the metal pressing plate 32 to ensure the stability of the connection between the tab and the adapter plate 2. Specific embodiment 3

[0039] The difference between this embodiment and embodiment 1 is that this embodiment also includes technical features: an anti-slip buckle 38 is provided at both ends of the short side of the pressing base 31, and the anti-slip buckle 38 can be embedded in the anti-slip hole 22 on the adapter plate 2 and snapped onto the adapter plate 2; a reinforcing plate 4 is provided at both ends of the outer side of the pressing base 31, and screw through holes are opened on the reinforcing plate 4, and plastic screws are driven into the screw through holes, and the plastic screws are fixed to the adapter plate 2 through the screw through holes.

[0040] In this embodiment, anti-slip buckles 38 and reinforcing plates 4 are provided on both sides of the pressing base 31. The pressing base 31 is fixed to the adapter plate 2 by driving plastic screws into the screw holes on the reinforcing plate 4. The provision of the anti-slip buckles 38 can strengthen the connection between the pressing base 31 and the adapter plate 2, thereby ensuring the stability of the connection between the pressing base 31 and the adapter plate 2. Specific embodiment 4

[0042] The difference between this embodiment and embodiment 1 is that this embodiment also includes technical features: a limit plate 39 is provided at both ends of the long side of the pressing base 31, and the limit plate 39 can be embedded in the electrode through-hole 21 on the adapter plate 2. The cross-section of the limit plate 39 is arc-shaped, and the limit plate 39 can press the electrode ear in the electrode through-hole 21; the metal pressing plate 32 is provided with irregular protrusions on the end face facing the electrode ear.

[0043] In this embodiment, by setting limit plates 39 at both ends of the pressing base 31, the limit plates 39 can press the tabs in the electrode vias 21 to prevent the tabs in the electrode vias 21 from curling or other forms of deformation, thereby ensuring the safety and stability of the entire battery. In this embodiment, irregular protrusions are provided on the end surface of the metal pressing plate 32 facing the tabs, which can effectively press tabs of different thicknesses, thereby preventing the problem of unstable connection between some tabs and the adapter plate 2 due to the difference in tab thickness, and ensuring the stability of the connection between the tabs and the adapter plate 2.

[0044] In summary, the present invention can be achieved by fixing the adapter plate 2 to one end of the soft-pack battery pack 1 with the pole ear, and then sequentially passing the pole ear on the battery cell 11 through the electrode through-hole 21 on the adapter plate 2, and then bending the pole ear so that the positive pole ear 12 and the negative pole ear 13 are bent and attached to the upper end surface of the adapter plate 2, and then aligning and fixing the buckling base 31 on the adapter plate 2, and finally driving the clamping bolt 34 into the threaded through-hole 33 on the buckling base 31, and the clamping bolt 34 is used to clamp the metal pressing plate 32, and then the buckling base 31 is aligned and fixed to the adapter plate 2. The metal pressing sheet 32 ​​plays a pressing role between the positive electrode tab 12 and the negative electrode tab 13 and the adapter plate 2, ensuring the stability of the connection between the tab and the adapter plate 2, thereby eliminating the original welding structure between the tab and the adapter plate 2, which can effectively prevent over-welding and cold welding during laser welding, ensuring the safety of the battery pack, and the tab and the adapter plate 2 are connected by crimping, which can also facilitate the disassembly of the battery pack during the subsequent battery recycling process. There is no need to cut the tab, and cascade utilization can be achieved, ensuring the recycling efficiency of the battery pack.

[0045] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft-pack battery tab series-parallel welding-free structure, characterized in that: include: Battery cells (11), the battery cells (11) being arranged in sequence to form a soft-pack battery pack (1), and each of the battery cells (11) being provided with a positive electrode tab (12) and a negative electrode tab (13) at one end; An adapter plate (2), the adapter plate (2) being arranged at one end of the soft-pack battery pack (1) provided with a positive electrode tab (12) and a negative electrode tab (13), the positive electrode tab (12) and the negative electrode tab (13) both passing through the electrode via hole (21) on the adapter plate (2) and being closely attached to the adapter plate (2), the adapter plate (2) being provided with a connection circuit, and being able to connect the positive electrode tab (12) and the negative electrode tab (13) closely attached to the adapter plate (2) in series and in parallel; A pressing assembly (3), wherein the pressing assembly (3) is detachably arranged on the upper end surface of the adapter plate (2), and the pressing assembly (3) can press the positive electrode tab (12) and the negative electrode tab (13) tightly attached to the adapter plate (2); The buckling assembly (3) includes a buckling base (31), the buckling base (31) is detachably mounted on the upper end surface of the adapter plate (2), a metal pressing plate (32) is provided at one end of the buckling base (31) facing the adapter plate (2), a plurality of threaded through holes (33) are evenly provided on the buckling base (31), each of the threaded through holes (33) is threadedly connected to a clamping bolt (34), and the clamping bolt (34) can pass through the threaded through hole (33) and be clamped on the upper end surface of the metal pressing plate (32); A fastener cover plate (35) is detachably mounted on the upper end surface of each of the buckling bases (31), and a plurality of limit buckles (36) are evenly arranged on one end of the fastener cover plate (35) facing the buckling base (31), and a limit hole (37) adapted to the limit buckle (36) is provided at the upper end of each of the clamping bolts (34), and the limit buckles (36) can be aligned and embedded in the limit holes (37) in sequence; The metal pressing sheet (32) is provided with irregular convex points on one end surface facing the tab; The limiting hole (37) on the clamping bolt (34) is uniformly provided with a plurality of limiting grooves (5) along its circumference, and the limiting buckle (36) is uniformly provided with a plurality of limiting ribs (6) adapted to the limiting grooves (5) along its circumference. When the limiting buckle (36) is embedded in the limiting hole (37), the limiting ribs (6) can be respectively embedded in the limiting grooves (5).

2. The soft-pack battery tab series-parallel welding-free structure according to claim 1, characterized in that: An anti-drop buckle (38) is provided at each end of the short side of the pressing base (31), and the anti-drop buckle (38) can be embedded in the anti-drop hole (22) on the adapter plate (2) and buckled onto the adapter plate (2).

3. The soft-pack battery tab series-parallel welding-free structure according to claim 1, characterized in that: A limiting plate (39) is provided at both ends of the long side of the pressing base (31), and the limiting plate (39) can be embedded in the electrode through hole (21) on the adapter plate (2). The cross section of the limiting plate (39) is arc-shaped, and the limiting plate (39) can press the tab in the electrode through hole (21).

4. The soft-pack battery tab series-parallel welding-free structure according to claim 1, characterized in that: A reinforcing plate (4) is provided at both ends of the outer side of the buckling base (31), and screw holes are provided on the reinforcing plate (4). Plastic screws are driven into the screw holes, and the plastic screws are fixed to the adapter plate (2) through the screw holes.

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