Vertical laser welding auxiliary clamp and busbar structure of multi-series-parallel soft package battery pack

Abstract

The utility model discloses a vertical laser welding auxiliary clamp and busbar structure of a multi-series-parallel soft package battery pack. A first battery pack fixing support and a second battery pack fixing support are of the same structure and are symmetrically arranged. The left busbar supporting block and the right busbar supporting block are of the same structure and are symmetrically arranged. The first battery pack fixing support or the second battery pack fixing support is composed of a bottom face, a front side wall, a rear side wall and a side vertical face, the rear side edge of the bottom face of the front end plate is fixed to the top edge of the front side wall, a second magnet bin is embedded in the side wall of the front end plate, the front side edge of the bottom face of the rear end plate is fixed to the top edge of the rear side wall, and a first magnet bin is embedded in the side wall of the rear end plate. A third magnet bin is embedded in the side wall of the bottom face, first buckle grooves are formed in the same positions of the front side wall and the rear side wall, a first limiting boss is fixed to the middle of the top edge of the side vertical face, and a first busbar limiting block is fixed to the top face of the first limiting boss. The transverse position and the longitudinal position of the busbar are limited through the fixing support and the left supporting block and the right supporting block of the busbar, and therefore the consistency of products is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of soft-pack lithium-ion batteries, and more specifically to a vertical laser welding auxiliary fixture and a busbar structure for a multi-series and parallel soft-pack battery pack. Background Art

[0002] Since soft-pack lithium-ion batteries have higher mass energy density and higher safety, there are more and more small consumer terminal products such as drones and floor scrubbers. Most of the batteries of these consumer terminal products are multi-series and parallel soft-pack lithium-ion batteries. Therefore, multiple batteries need to be connected in series or in parallel to meet the requirements of increasing battery capacity or voltage. Today's soft-pack lithium-ion batteries generally need to be welded to the busbar. How to connect these multi-series and parallel soft-pack batteries through simple and effective operations is particularly important.

[0003] At present, the series and parallel connection of soft-pack lithium-ion batteries is fixedly connected to the busbar by soldering, and each pole ear of the soft-pack lithium-ion battery pack is fixedly connected to the corresponding pad of the busbar by soldering.

[0004] The existing technology has the following deficiencies: ① The high temperature of nearly 300° generated during soldering will be directly transmitted to the inside of the battery, causing certain damage to the internal structure of the battery cell. If the welding time is long, it may even cause the battery cell to explode and catch fire in serious cases; ② Due to the limited operating environment of soldering, it is not easy to achieve mechanization and automation; ③ The bus has no limit, and the accuracy of the bus position cannot be guaranteed, thereby failing to ensure the consistency of the product. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a vertical laser welding auxiliary fixture and a busbar structure for a multi-series and parallel soft-pack battery pack.

[0006] The utility model discloses a vertical laser welding auxiliary fixture and busbar structure for a multi-series and parallel soft-pack battery pack, which is realized by the following technical scheme, including a battery pack fixing bracket 10, a magnet 20, a magnet 2 30, a battery pack 40, a limit busbar 50, a busbar left support block 60, a busbar right support block 70 and a battery pack fixing bracket 2 80; the battery pack fixing bracket 10 and the battery pack fixing bracket 2 80 have the same structure and are symmetrically arranged; the busbar left support block 60 and the busbar right support block 70 have the same structure and are symmetrically arranged;

[0007] The battery pack fixing bracket 10 or the battery pack fixing bracket 2 80 is composed of a bottom surface, a front side wall, a rear side wall and a side elevation. The rear side edge of the bottom surface of the front end plate is fixed to the top edge of the front side wall. The side wall of the front end plate is embedded with a magnet compartment 2 16. The front side edge of the bottom surface of the rear end plate is fixed to the top edge of the rear side wall. The side wall of the rear end plate is embedded with a magnet compartment 15. The side wall of the bottom surface is embedded with a magnet compartment 3 17. A hand-gripping groove 18 is provided at the same position of the front side wall and the rear side wall. A limiting boss 1 is fixed to the middle of the top edge of the side elevation. A busbar limiting block 14 is fixed to the top surface of the limiting boss 1. The front platform of the limiting boss 1 is the left supporting surface 12. The rear platform of the limiting boss 1 is the right supporting surface 13. The cavity formed by the bottom surface, the front side wall, the rear side wall and the side elevation is the battery pack fixing compartment 11.

[0008] The magnet bin 15 and the magnet bin 2 16 are respectively inlaid with symmetrically arranged magnets 20, and the magnet bin 3 17 is inlaid with magnets 30; the left support surface 12 supports the left support block 60 of the bus, and the right support surface 13 supports the right support block 70 of the bus; and the bus limit block 14 is used to limit the lateral position of the bus 50.

[0009] The bus 50 includes two rows of lug 1 clamping holes 511, lug 2 clamping holes 512, lug 3 clamping holes 513, lug 4 clamping holes 514, lug 5 clamping holes 515 and lug 6 clamping holes 516, which are arranged opposite to each other in front and back. An L-shaped nickel strip 1 517 is installed between the lug 1 clamping holes and the lug 3 clamping holes, an L-shaped nickel strip 2 518 is installed between the lug 3 clamping holes and the lug 5 clamping holes, an L-shaped nickel strip 3 519 is installed between the lug 2 clamping holes and the lug 4 clamping holes, and an L-shaped nickel strip 4 520 is installed between the lug 4 clamping holes and the lug 6 clamping holes, wherein the clamping holes of each lug correspond to the positions of the lugs of the battery pack.

[0010] The left support block of the bus is a T-shaped structure, and four boss structures are fixed to the upper end of the T-shaped structure, wherein the bottom surfaces of the four bosses are respectively left table top 1 62, left table top 2 63, left table top 3 64, and left table top 4 65; the top surface of left table top 3 64 is fixed with the bus left limit 61.

[0011] The right support block of the bus is a T-shaped structure, and four boss structures are fixed to the upper end of the T-shaped structure, wherein the bottom surfaces of the four bosses are right table top 1 72, right table top 2 73, right table top 3 74, and right table top 4 75 respectively; the top surface of right table top 2 73 is fixed with the right limiter 71 of the bus.

[0012] The battery pack 40 includes a first tab 41 , a second tab 42 , a third tab 43 , a fourth tab 44 , a fifth tab 45 , and a sixth tab 46 . The tabs are arranged in two rows in a front-to-back relationship.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] ① Fix the battery pack by the fixing bracket, and limit the horizontal and vertical positions of the bus by the fixing bracket and the left and right support blocks of the bus, so as to ensure the consistency of the product.

[0015] ② Ensure that the laser welding claws will not press the battery pack when pressing the busbar during the laser welding process, avoid damaging the battery pack and improve the safety of the battery pack.

[0016] ③ The tab holes and nickel strip design of the busbar can cleverly ensure that the tabs of the battery pack are fixedly connected to the busbar through laser welding, ensuring simple and quick operation, improving the yield rate, reducing labor costs, and enhancing competitive advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of a battery pack fixing bracket 1 in the utility model;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the battery pack in the utility model;

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the busbar in the utility model;

[0021] Figure 5a It is a three-dimensional structural schematic diagram of the left supporting block of the busbar in the utility model (front view);

[0022] Figure 5b It is a three-dimensional structural schematic diagram of the left supporting block of the busbar in the utility model (reverse side);

[0023] Figure 6a It is a three-dimensional structural schematic diagram of the right supporting block of the busbar in the utility model (front view);

[0024] Figure 6b It is a three-dimensional structural schematic diagram of the right supporting block of the busbar in the utility model (reverse side);

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the battery pack fixing bracket 2 in the utility model;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the battery pack in the present invention after being placed on a fixing bracket;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the battery pack fixing bracket 2 after being adsorbed on the fixing bracket 1 in the utility model;

[0028] Fig.10It is a schematic diagram of the three-dimensional structure after the left support block and the right support block of the busbar are inserted in the utility model;

[0029] Fig.11 It is a three-dimensional structural schematic diagram of inserting the busbar behind the battery pack tab in the utility model;

[0030] Fig.12 It is a schematic diagram of the three-dimensional structure of the battery pack after the tabs are bent in the utility model;

[0031] Fig.13 It is a schematic diagram of the three-dimensional structure of the busbar nickel strip after being bent in the utility model. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the utility model, and the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the utility model. The terms used herein in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0033] See also Figure 1 The utility model includes a battery pack fixing bracket 10, a magnet 20, a magnet 2 30, a battery pack 40, a limit bus 50, a bus left support block 60, a bus right support block 70 and a battery pack fixing bracket 2 80; the battery pack fixing bracket 10 and the battery pack fixing bracket 2 80 have the same structure and are symmetrically arranged; the bus left support block 60 and the bus right support block 70 have the same structure and are symmetrically arranged;

[0034] See also Figure 2The battery pack fixing bracket 10 includes a bottom surface, a front side wall, a rear side wall and a side elevation. The rear side edge of the bottom surface of the front end plate is fixed to the top edge of the front side wall. The side wall of the front end plate is embedded with a magnet bin 2 16. The front side edge of the bottom surface of the rear end plate is fixed to the top edge of the rear side wall. The side wall of the rear end plate is embedded with a magnet bin 15. The side wall of the bottom surface is embedded with a magnet bin 3 17. A hand-grip groove 18 is arranged at the same position of the front side wall and the rear side wall. A limiting boss 1 is fixed to the middle of the top edge of the side elevation. A busbar limiting block 14 is fixed to the top surface of the limiting boss 1. The front platform of the limiting boss 1 is the left supporting surface 12. The rear platform of the limiting boss 1 is the right supporting surface 13. The cavity formed by the bottom surface, the front side wall, the rear side wall and the side elevation is the battery pack fixing bin 11.

[0035] The magnet compartment 15 and the magnet compartment 2 16 are respectively inlaid with symmetrically arranged magnets 1 20, and the magnet compartment 3 17 is inlaid with magnets 2 30; the left support surface 12 supports the left support block 60 of the bus, and the right support surface 13 supports the right support block 70 of the bus; the bus limit block 14 is used to limit the lateral position of the bus 50;

[0036] The battery pack fixing compartment 11 is used to place the battery pack 40;

[0037] The left support surface 12 supports the left busbar support block 60, and the right support surface 13 supports the right busbar support block 70;

[0038] The busbar limiting block 14 is used to limit the lateral position of the busbar 50;

[0039] The handle position 17 is convenient for taking out the battery pack 40 after the welding process;

[0040] See also Figure 3 The battery pack 40 includes a first tab 41, a second tab 42, a third tab 43, a fourth tab 44, a fifth tab 45, and a sixth tab 46; the tabs are arranged in two rows in a front-to-back direction.

[0041] See also Figure 4 The busbar 50 includes a first lug hole 511, a second lug hole 512, a third lug hole 513, a fourth lug hole 514, a fifth lug hole 515, and a sixth lug hole 516, wherein the lug holes are arranged in two rows front to back, an L-shaped nickel strip 1 517 is installed between the first lug hole and the third lug hole, an L-shaped nickel strip 2 518 is installed between the third lug hole and the fifth lug hole, an L-shaped nickel strip 3 519 is installed between the second lug hole and the fourth lug hole, and an L-shaped nickel strip 4 520 is installed between the fourth lug hole and the sixth lug hole, wherein the lug holes correspond to the lug positions, and the polarity of each nickel strip is welded to the corresponding lug;

[0042] See also Figure 5a and Figure 5bThe left busbar support block 60 is a T-shaped structure, and four boss structures are fixed on the upper end of the T-shaped structure, wherein the bottom surfaces of the four bosses are respectively left platform 1 62, left platform 2 63, left platform 3 64, and left platform 4 65; the top surface of the left platform 3 64 is fixed with the left busbar limiter 61. (The material of the left busbar support block 60 is red bakelite or other insulating materials);

[0043] See also Figure 6a and Figure 6b The right busbar support block 70 is a T-shaped structure, and four boss structures are fixed on the upper end of the T-shaped structure, wherein the bottom surfaces of the four bosses are right platform 1 72, right platform 2 73, right platform 3 74, and right platform 4 75 respectively; the top surface of right platform 2 73 is fixed with the right busbar limiter 71. (The material of the right busbar support block 70 is red bakelite or other insulating materials);

[0044] See also Figure 7 The second battery pack fixing bracket 80 includes a second battery pack fixing compartment 81, a second left supporting surface 82, a second right supporting surface 83, a second busbar limiting block 84, a fourth magnet compartment 85, a fifth magnet compartment 86, a sixth magnet compartment 87, and a second buckle groove 88 (wherein the material of the second battery pack fixing bracket 80 is red bakelite or other insulating materials);

[0045] like Figure 8 and Fig. 9 First, place the battery pack 40 in the battery pack fixing bracket 10, and then fix the battery pack fixing bracket 2 80 by adsorption through the magnet 1 20 and the magnet 2 30, wherein the magnet compartment 1 15, the magnet compartment 2 16, and the magnet compartment 3 17 correspond to the positions of the magnet compartment 4 85, the magnet compartment 5 86, and the magnet compartment 6 87, respectively, so as to ensure the relative positions of the battery pack fixing bracket 10 and the battery pack fixing bracket 2 80 for adsorption, and ensure that the battery pack 40 is not squeezed in the battery pack compartment formed by the fixing bracket 10 and the battery pack fixing bracket 2 80; at the same time, ensure that the left support surface 12 and the left support surface 2 82 are on the same horizontal plane, and the right support surface 1 13 and the right support surface 2 83 are on the same horizontal plane;

[0046] like Fig.10 Then, the left bus support block 60 and the right bus support block 70 are inserted into the fixing bracket 10 and the battery pack fixing bracket 2 80, wherein the left support surface 12 overlaps with the left table top 1 62, the left support surface 2 82 overlaps with the left table top 4 65, the right support surface 1 13 overlaps with the right table top 1 72, and the right support surface 2 83 overlaps with the right table top 4 75; at the same time, after overlapping, it is necessary to ensure that the left table top 2 63, the left table top 643, the right table top 2 73, and the right table top 4 74 cannot contact the battery pack to prevent the battery pack from being crushed;

[0047] like Fig.11, and then the busbar 50 is inserted into the pole lug 1 41, the pole lug 2 42, the pole lug 3 43, the pole lug 44, the pole lug 5 45, and the pole lug 6 46 through the pole lug 1 clamping hole 511, the pole lug 2 clamping hole 512, the pole lug 3 clamping hole 513, the pole lug 4 clamping hole 514, the pole lug 5 clamping hole 515, and the pole lug 6 clamping hole 516 respectively. The pole lug clamping holes in the busbar are clearance fits, which can ensure that the pole lug clamping holes can be easily inserted into each pole lug;

[0048] At the same time, the bus limit block 14, the bus limit block 2 84, the bus left limit 61 and the bus right limit 71 respectively limit the bus 50 in four directions to ensure the relative position of the bus 50 and the battery pack 40. The limits in the four directions must fully consider the tolerances in the length and width directions of the bus to prevent the bus from failing to fit in.

[0049] like Fig.12 Then, each pole ear of the battery pack 40 is bent 90° as required to ensure that the polarity of each pole ear is the same as the polarity of each nickel strip of the bus bar to prevent the battery pack from short circuiting.

[0050] like Fig.13 Then, each nickel strip in the busbar 50 is bent 90° as shown in the figure. In this way, the auxiliary operation of laser welding is completed, and the laser welding operation can be directly performed in the laser welding equipment.

[0051] After the laser welding process is completed, first take out the left bus support block 60 and the right bus support block 70 horizontally, then separate the battery pack fixing bracket 10 and the battery pack fixing bracket 2 80 through the buckle groove 18 and the buckle groove 2 88, then take out the welded battery pack, and then proceed with the subsequent operations.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A vertical laser welding auxiliary fixture and busbar structure for a multi-series and parallel soft-pack battery pack, characterized in that: It includes a battery pack fixing bracket 1, a magnet 1, a magnet 2, a battery pack, a limit bus, a bus left support block, a bus right support block and a battery pack fixing bracket 2; the battery pack fixing bracket 1 has the same structure as the battery pack fixing bracket 2 and is symmetrically arranged; the bus left support block has the same structure as the bus right support block and is symmetrically arranged; The battery pack fixing bracket 1 or the battery pack fixing bracket 2 is composed of a bottom surface, a front side wall, a rear side wall and a side elevation. The rear side edge of the bottom surface of the front end plate is fixed to the top edge of the front side wall. The side wall of the front end plate is embedded with a magnet bin 2. The front side edge of the bottom surface of the rear end plate is fixed to the top edge of the rear side wall. The side wall of the rear end plate is embedded with a magnet bin 1. The side wall of the bottom surface is embedded with a magnet bin 3. A hand-grip groove 1 is arranged at the same position of the front side wall and the rear side wall. A limiting boss 1 is fixed in the middle of the top edge of the side elevation. A busbar limiting block 1 is fixed to the top surface of the limiting boss 1. The front platform of the limiting boss 1 is the left supporting surface 1. The rear platform of the limiting boss 1 is the right supporting surface 1. The cavity formed by the bottom surface, the front side wall, the rear side wall and the side elevation is the battery pack fixing bin 1. The magnet bin 1 and the magnet bin 2 are respectively inlaid with symmetrically arranged magnet 1, and the magnet bin 3 is inlaid with magnet 2; wherein the left support surface 1 supports the left support block of the bus, and the right support surface 1 supports the right support block of the bus; wherein the bus limit block 1 is used to limit the lateral position of the bus.

2. The vertical laser welding auxiliary fixture and busbar structure of the multi-series and parallel soft-pack battery pack according to claim 1 is characterized in that: The busbar comprises two rows of tab one clamping hole, tab two clamping hole, tab three clamping hole, tab four clamping hole, tab five clamping hole and tab six clamping hole which are arranged opposite to each other in front and back.

3. The vertical laser welding auxiliary fixture and busbar structure of the multi-series and parallel soft-pack battery pack according to claim 2 is characterized in that: An L-shaped nickel strip one is installed between the first and third holes of the pole lug, an L-shaped nickel strip two is installed between the third and fifth holes of the pole lug, an L-shaped nickel strip three is installed between the second and fourth holes of the pole lug, and an L-shaped nickel strip four is installed between the fourth and sixth holes of the pole lug, wherein the holes of each pole lug correspond to the positions of the pole lugs of the battery pack.

4. The vertical laser welding auxiliary fixture and busbar structure of the multi-series and parallel soft-pack battery pack according to claim 1 is characterized in that: The left support block of the busbar is a T-shaped structure.

5. The vertical laser welding auxiliary fixture and busbar structure of the multi-series and parallel soft-pack battery pack according to claim 4 is characterized in that: Four boss structures are fixed to the upper surface end of the T-shaped structure of the left support block of the bus, wherein the bottom surfaces of the four bosses are left platform one, left platform two, left platform three, and left platform four respectively; the top surface of the left platform three is fixed with the left limit of the bus.

6. The vertical laser welding auxiliary fixture and busbar structure of the multi-series and parallel soft-pack battery pack according to claim 1 is characterized in that: The right support block of the busbar is a T-shaped structure.

7. The vertical laser welding auxiliary fixture and busbar structure of the multi-series and parallel soft-pack battery pack according to claim 6 is characterized in that: Four boss structures are fixed to the upper surface end of the T-shaped structure of the right support block of the bus, wherein the bottom surfaces of the four bosses are right platform one, right platform two, right platform three, and right platform four respectively; the top surface of the right platform two is fixed with the right limiter of the bus.

8. The vertical laser welding auxiliary fixture and busbar structure of a multi-series and parallel soft-pack battery pack according to claim 1 is characterized in that: The battery pack includes a first tab, a second tab, a third tab, a fourth tab, a fifth tab and a sixth tab; the tabs are arranged in two rows front to back.

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