Series battery assembly structure

Abstract

In order to solve the problems of widening of a circuit board, occupation of more space, increase of cost, more welding spots and increase of production time in the existing assembly process for connecting two or more batteries in series, the utility model provides a series battery assembly structure which comprises a battery pack, the battery pack comprises a plurality of single batteries, at least one welding sheet and a circuit board, one end of each single battery is provided with a positive tab and a negative tab, and the welding sheet is arranged at one end of two adjacent single batteries. The positive tab of one single battery and the negative tab of the other single battery in two adjacent single batteries are respectively connected with one welding piece; one end, far away from the single battery, of the welding piece is connected with the circuit board; and positive tabs and negative tabs, which are not connected with the welding piece, in the single battery are respectively connected with the circuit board. According to the series battery assembly structure provided by the invention, welding spots are reduced, the welding process difficulty is reduced, the space positions of a circuit board and electronic components can be effectively reserved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a series battery assembly structure. Background Art

[0002] Existing consumer battery products are equipped with circuit boards on both the battery and the host. In order to improve the endurance of the electrical device or meet the requirements of battery capacity, two or more batteries are connected in series in the electrical device. In connecting two or more batteries in series, the assembly process used is specifically described as follows, taking two batteries in series as an example: the two batteries are both structures with positive and negative electrodes at the same end, and the positive and negative ends of the two batteries are respectively subjected to nickel sheet spot welding process with the circuit board through nickel sheets, so as to achieve electrical connection between the circuit board and the battery. The above assembly method has the following problems: First, the size of the circuit board used needs to be widened to have enough space to accommodate the pole ears of the series battery. Widening the circuit board will take up more space, limiting the design and portability of the product; and increasing the cost of the product. Second, each pole ear of the battery must be welded to the circuit board, requiring more welding points, increasing the complexity of the welding process and production time. Utility Model Content

[0003] The utility model aims to solve the problem that in the existing assembly process for connecting two or more batteries in series, the circuit board needs to be widened, which takes up more space, increases costs, has more solder joints, and increases production time. The present application provides a series battery assembly structure.

[0004] The present application provides a series battery assembly structure, including a battery pack, the battery pack including a plurality of single cells, at least one welding sheet and a circuit board, one end of the single cell is provided with a positive electrode ear and a negative electrode ear, the welding sheet is provided at one end of two adjacent single cells, and the positive electrode ear of one of the two adjacent single cells and the negative electrode ear of the other single cell are respectively connected to one of the welding sheets;

[0005] One end of the welding sheet away from the single cell is connected to the circuit board, and the positive electrode tab and the negative electrode tab of the single cell that are not connected to the welding sheet are connected to the circuit board respectively.

[0006] Preferably, the plurality of single cells are arranged in an array along a preset direction, each of the welding sheets comprises a first connecting portion, the first connecting portion extends along the array direction of the single cells, and the positive electrode ear of one of the two adjacent single cells and the negative electrode ear of the other single cell are respectively connected to one of the first connecting portions.

[0007] Preferably, the welding sheet also includes a second connecting portion, one end of the second connecting portion is connected to a side of the first connecting portion away from the single cell, and the second connecting portion extends from the first connecting portion in a direction away from the single cell, and one end of the second connecting portion away from the first connecting portion is connected to the circuit board.

[0008] Preferably, in the array direction of the single battery cells, the length of the first connecting portion is greater than the length of the second connecting portion.

[0009] Preferably, the second connecting portion is arranged perpendicular to the first connecting portion.

[0010] Preferably, the battery pack also includes an insulating adhesive assembly, which includes a first insulating adhesive piece, which is adhered to two adjacent single cells and located on both sides of the single cells, and covers the gap between the two adjacent single cells. The first insulating adhesive piece extends from one end of the single cell away from the welding sheet toward the circuit board.

[0011] Preferably, the end of the first insulating adhesive member away from the circuit board covers a portion of the end surface of the single battery.

[0012] Preferably, the battery pack also includes a second insulating adhesive member, the battery pack includes a plurality of battery cells arranged in the same direction, the second insulating adhesive member covers the side surfaces of the battery cells located at the edge of the battery pack, and the second insulating adhesive member extends from one end of the battery cell away from the welding sheet toward a direction close to the circuit board.

[0013] Preferably, the battery pack also includes a third insulating adhesive member, the third insulating adhesive member includes a first insulating member, a connecting wire is provided on the side of the circuit board away from the welding sheet, the first insulating member passes through the connecting wire cover and is arranged on the periphery of the circuit board, and the first insulating member abuts against the end face of the single battery.

[0014] Preferably, the third insulating adhesive member further includes a second insulating member with openings at both ends, and the second insulating member is sleeved on the outer periphery of the first insulating member.

[0015] Compared with the prior art, the series battery assembly structure provided by the present application has the positive and negative ears of the single battery cells arranged at the same end, the positive ear of one battery cell in two adjacent single batteries is connected to one end of the welding piece, and the negative ear of the other battery cell is connected to the other end of the welding piece, and then the welding piece is connected to the circuit board, reducing the original four welds to three welds, and each additional welding piece reduces one welding point, thereby reducing the difficulty of the welding process and shortening the welding time; at the same time, it also reduces the welding space of the circuit board, which can effectively reserve the spatial position of the circuit board and electronic components and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded view of a series battery assembly structure provided by an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of a series battery assembly structure - battery and welding sheet connection provided by an embodiment of the utility model;

[0018] Figure 3 This is a front view of a series battery assembly structure provided by an embodiment of the utility model - a battery and a circuit board are connected;

[0019] Figure 4 This is a rear view of a series battery assembly structure provided by an embodiment of the utility model - a battery and a circuit board are connected;

[0020] Figure 5 This is a schematic diagram of a series battery assembly structure provided by an embodiment of the utility model.

[0021] 1. Single battery; 101. Positive ear; 102. Negative ear; 2. Welding piece; 201. First connecting part; 202. Second connecting part; 3. Circuit board; 4. Connecting wire; 5. First insulating adhesive; 6. Second insulating adhesive; 7. Third insulating adhesive; 701. First insulating part; 702. Second insulating part. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] In order to illustrate the technical solution of the present utility model, specific embodiments are provided below for illustration.

[0024] like Figure 1-Figure 5As shown, an embodiment of the present application provides a series battery assembly structure, including a battery pack, the battery pack includes a plurality of single cells 1, at least one welding sheet 2 and a circuit board 3, one end of the single cell 1 is provided with a positive electrode ear 101 and a negative electrode ear 102, the welding sheet 2 is provided at one end of two adjacent single cells 1, and the positive electrode ear 101 of one of the two adjacent single cells 1 and the negative electrode ear 102 of the other single cell 1 are respectively connected to one welding sheet 2;

[0025] One end of the welding sheet 2 away from the single battery 1 is connected to the circuit board 3 , and the positive electrode tab 101 and the negative electrode tab 102 of the single battery 1 that are not connected to the welding sheet 2 are connected to the circuit board 3 , respectively.

[0026] Specifically, the battery pack includes a plurality of single cells 1 arranged in an array according to a preset direction, wherein the single cell 1 is a structure in which the positive electrode ear 101 and the negative electrode ear 102 are arranged at the same end of the battery cell; the positive electrode ear 101 of one of the two adjacent single cells 1 is connected to the welding piece 2, and the negative electrode ear 102 of the other single cell 1 is connected to the welding piece 2, and then the welding piece 2 is directly connected to the circuit board 3, thereby reducing the number of solder joints with the circuit board 3, and each additional solder joint 2 reduces one solder joint, thereby simplifying the welding process, saving welding time, and improving production efficiency.

[0027] Each positive electrode ear 101 and negative electrode ear 102 in the existing series-connected battery must be welded to the circuit board 3. The circuit board 3 must be made relatively wide to accommodate the ears. The positive electrode ear 101 of one of the two adjacent single cells 1 is connected to the welding piece 2, and the negative electrode ear 102 of the other single cell 1 is connected to the welding piece 2. Then the welding piece 2 is connected to the circuit board 3, which reduces the position for welding with the circuit board 3. The circuit board 3 does not need to be made wider, thereby reducing the production cost. In the series battery assembly structure provided by the present application, the positive ear 101 and the negative ear 102 of the single battery 1 are arranged at the same end, the positive ear 101 of one battery cell in two adjacent single batteries 1 is connected to one end of the welding piece 2, and the negative ear 102 of the other battery cell is connected to the other end of the welding piece 2, and then the welding piece 2 is connected to the circuit board 3, reducing the original four welds to three welds, and each additional welding piece 2 reduces one welding point, thereby reducing the difficulty of the welding process and shortening the welding time; at the same time, the welding space of the circuit board 3 is also reduced, which can effectively reserve the spatial position of the circuit board 3 and electronic components and reduce the production cost.

[0028] In this embodiment, a plurality of the single cells 1 are arranged in an array along a preset direction, and each of the welding sheets 2 includes a first connecting portion 201, which extends along the array direction of the single cells 1, and the positive electrode ear 101 of one of the two adjacent single cells 1 and the negative electrode ear 102 of the other single cell 1 are respectively connected to one of the first connecting portions 201.

[0029] Specifically, Figure 2 As shown, each welding piece 2 includes a first connection portion 201, and two adjacent single cells 1 are defined as a first cell and a second cell. One end of the first connection portion 201 is connected to the positive electrode ear 101 of the first cell, and the end of the first connection portion 201 away from the first cell is connected to the negative electrode ear 102 of the second cell. It should be noted that the same welding piece 2 cannot be connected to the positive electrode ear 101 and the negative electrode ear 102 of the same cell to prevent the cell from short-circuiting. The first connection portion 201 is mainly connected to the electrode ear of the single cell 1, which reduces the number of welding points between the circuit board 3 and the welding piece 2.

[0030] In this embodiment, the welding sheet 2 also includes a second connecting portion 202, one end of the second connecting portion 202 is connected to a side of the first connecting portion 201 away from the single battery 1, and the second connecting portion 202 extends from the first connecting portion 201 in a direction away from the single battery 1, and one end of the second connecting portion 202 away from the first connecting portion 201 is connected to the circuit board 3.

[0031] Specifically, Figure 1 , 2 As shown, one end of the second connection part 202 is connected to the first connection part 201, and the end of the second connection part 202 away from the single battery 1 is connected to the circuit board 3. The second connection part 202 is mainly used to connect to the circuit board 3, which reduces the welding points where the positive electrode ear 101 and the negative electrode ear 102 in the single battery 1 are respectively welded to the circuit board 3, thereby reducing the complexity of the welding process.

[0032] In this embodiment, in the array direction of the single battery cells 1 , the length of the first connecting portion 201 is greater than the length of the second connecting portion 202 .

[0033] Specifically, Figure 1 , 2As shown, in the array direction of the battery cells, the length of the first connection portion 201 is much greater than the length of the second connection portion 202. The second connection portion 202 is only used for welding with the circuit board 3, so the size of the second connection portion 202 can be made smaller, as long as it can be welded with the circuit board 3, and the cost is also reduced. Since the first connection portion 201 needs to be welded with the tabs of two adjacent single cells 1, the length of the first connection portion 201 in the array direction is longer to ensure that it can be welded with the positive tab 101 of one of the two adjacent single cells 1, and the same welding piece 2 can also be welded with the negative tab 102 of the other single cell 1.

[0034] In this embodiment, the second connection portion 202 is disposed perpendicular to the first connection portion 201 .

[0035] Specifically, Figure 1 As shown, the first connection portion 201 and the second connection portion 202 in the welding sheet 2 are perpendicular to each other, that is, the structure of the welding sheet 2 is T-shaped. The second connection portion 202 is arranged perpendicular to the first connection portion 201, which facilitates the welding of the second connection portion 202 in the welding sheet 2 with the circuit board 3, and the welding sheet 2 occupies a small space.

[0036] In this embodiment, the positive electrode ear 101 of one of the two adjacent single cells 1 is bent toward the pole core to form a first bending portion, and the negative electrode ear 102 of the other single cell 1 is bent toward the pole core to form a second bending portion, one end of the first connecting portion 201 is connected to the first bending portion, and the end of the first connecting portion 201 away from the first bending portion is connected to the second bending portion.

[0037] Specifically, the first bending portion and the second bending portion have the following functions: first, they facilitate welding of the positive electrode ear 101, the negative electrode ear 102 and the first connecting portion 201; second, they reduce the space occupied by the welding sheet 2 and improve the space utilization of the battery pack.

[0038] In this embodiment, the welding sheet 2 is made of nickel.

[0039] In this embodiment, the battery pack also includes an insulating adhesive component, which includes a first insulating adhesive component 5. The first insulating adhesive component 5 is pasted on two adjacent single cells 1 and is located on both sides of the single cell 1. The first insulating adhesive component 5 covers the gap between the two adjacent single cells 1. The first insulating adhesive component 5 extends from one end of the single cell 1 away from the welding sheet 2 toward the direction of the circuit board 3.

[0040] Specifically, the insulating adhesive has insulating and bonding effects. The sides of two adjacent single cells 1 are adjacent, and there is a weak current on the side of the battery. The first insulating adhesive 5 is set on the two adjacent single cells 1, and covers the gap between the two adjacent single cells 1, and is located on both sides of the single cell 1, which can stick the two single cells 1 together and prevent battery leakage. The positive ear 101 and the negative ear 102 are defined as the top of the single cell 1, and the first insulating adhesive 5 is located on both sides of the single cell 1, which means that the first insulating adhesive is attached to the front side and the rear side of the single cell 1.

[0041] The first insulating adhesive member 5 is to cover the exposed positive electrode tab 101 and the negative electrode tab 102 to play a protective role.

[0042] In this embodiment, one end of the first insulating adhesive member 5 away from the circuit board 3 covers a portion of the end surface of the single battery 1 .

[0043] Specifically, the positive electrode ear 101 and the negative electrode ear 102 are defined as the top of the single battery 1 , and the end of the first insulating adhesive member 5 away from the circuit board 3 covers a portion of the end surface of the single battery 1 , which means that the first insulating adhesive member also covers the bottom of the single battery 1 .

[0044] like Figure 1 As shown, the first insulating adhesive member 5 is U-shaped. The U-shaped structure means that the first insulating adhesive member covers and adheres the bottom, front side and rear side of the single battery 1 to protect the single battery 1 and insulate it.

[0045] It should be noted that the first insulating adhesive member 5 can selectively cover the bottom of the single cell 1, or only cover the front and rear sides of the single cell 1. At the same time, the first insulating adhesive member 5 extends toward the circuit board 3 to cover the exposed tabs and welding sheets 2.

[0046] In this embodiment, the battery pack also includes a second insulating adhesive member 6, and the battery pack includes a plurality of battery cells arranged in the same direction. The second insulating adhesive member 6 covers the side surfaces of the battery cells located at the edge of the battery pack, and the second insulating adhesive member 6 extends from one end of the single battery 1 away from the welding sheet 2 toward a direction close to the circuit board 3.

[0047] Specifically, Figure 5 As shown, the battery pack includes two single cells 1 arranged in the same direction, and the second insulating adhesive member 6 is coated on the sides of the two single cells 1 to provide insulation protection and prevent leakage. The second insulating adhesive member 6 also extends toward the direction close to the circuit board 3 to ensure that the entire side of the single cell 1 is completely coated, and the exposed tabs and circuit board 3 are also coated.

[0048] Similarly, when the battery pack includes more than two single cells 1 arranged in the same direction, the second insulating adhesive member 6 is wrapped around the sides of the single cells 1 located on both sides of the battery pack.

[0049] In this embodiment, the battery pack also includes a third insulating adhesive member 7, and the third insulating adhesive member 7 includes a first insulating member 701. A connecting wire 4 is provided on the side of the circuit board 3 away from the welding sheet 2. The first insulating member 701 passes through the connecting wire 4 and is covered on the periphery of the circuit board 3, and the first insulating member 701 abuts against the end face of the single battery 1.

[0050] Specifically, the third insulating adhesive member 7 mainly plays the role of protecting the circuit board 3 and insulating. The first insulating member 701 passes through the end of the connecting wire 4 away from the circuit board 3 and is covered on the periphery of the circuit board 3, playing the role of protecting the circuit board 3 and insulating to prevent the circuit board 3 from short-circuiting with the external connecting wire 4. The first insulating member 701 abuts against the end face of the single battery 1, which means that the side of the positive ear 101 and the negative ear 102 is defined as the top of the single battery 1. The first insulating member 701 is not only arranged on the periphery of the circuit board 3, but also abuts against the top surface of the single battery 1, so that the first insulating member 701 can cover the positive ear 101 and the negative ear 102 in the battery pack, and play a better insulating role.

[0051] In this embodiment, the first insulating member 701 is provided with two opposite side surfaces and a top surface, the top surface is provided with a hole, and the connecting wire 4 is arranged in the hole.

[0052] Specifically, Figure 1 As shown, the first insulating member 701 has a structure with two side surfaces and a top surface, and a hole is provided on the top surface to facilitate the first insulating member 701 to pass through the end of the connecting wire 4 away from the circuit board 3 .

[0053] In this embodiment, the third insulating adhesive member 7 further includes a second insulating member 702 with openings at both ends, and the second insulating member 702 is sleeved on the outer periphery of the first insulating member 701 .

[0054] Specifically, the second insulating member 702 is sleeved on the outer periphery of the second insulating member 702 to play an insulating role, while protecting the circuit board 3 and the connecting wire 4 to prevent the connection position between the connecting wire 4 and the circuit board 3 from being exposed.

[0055] In this embodiment, if Figure 1 As shown, both ends of the second insulating member 702 are open, and the second insulating member 702 includes two pairs of side surfaces, and each pair of side surfaces is arranged opposite to each other to form the outer periphery of the second insulating member 702 .

[0056] In this embodiment, if Figure 1As shown, the first insulating member 701 includes a pair of side surfaces and a top surface, the pair of side surfaces are arranged opposite to each other, the top surface is arranged on one side of the two side surfaces, and a hole is arranged on the top surface, and the hole is used for the connection line 4 to pass through. The first insulating member 701 is provided with a pair of side surfaces to save costs. It is understandable that the first insulating member 701 can also be provided with two pairs of side surfaces, and the two pairs of side surfaces are arranged to form the outer periphery of the first insulating member 701, but this structure increases the cost.

[0057] In this embodiment, the circuit board is a PCBA board, also known as a printed circuit board.

[0058] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them. Although the utility model is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the utility model, and should be included in the protection scope of the utility model.

Claims

1. A series battery assembly structure, characterized in that: The battery pack comprises a plurality of single cells (1), at least one welding sheet (2) and a circuit board (3), wherein one end of each single cell (1) is provided with a positive electrode tab (101) and a negative electrode tab (102), the welding sheet (2) is provided at one end of two adjacent single cells (1), and the positive electrode tab (101) of one of the two adjacent single cells (1) and the negative electrode tab (102) of the other single cell (1) are respectively connected to one of the welding sheets (2); One end of the welding sheet (2) away from the single cell (1) is connected to the circuit board (3), and the positive electrode tab (101) and the negative electrode tab (102) in the single cell (1) that are not connected to the welding sheet (2) are respectively connected to the circuit board (3).

2. The series battery assembly structure according to claim 1, characterized in that: A plurality of the single cells (1) are arranged in an array along a preset direction, each of the welding sheets (2) comprises a first connection portion (201), the first connection portion (201) extending along the array direction of the single cells (1), and the positive electrode ear (101) of one of the two adjacent single cells (1) and the negative electrode ear (102) of the other of the two adjacent single cells (1) are respectively connected to one of the first connection portions (201).

3. The series battery assembly structure according to claim 2, characterized in that: The welding sheet (2) further comprises a second connection portion (202), one end of the second connection portion (202) being connected to a side of the first connection portion (201) away from the single battery (1), and the second connection portion (202) extending from the first connection portion (201) in a direction away from the single battery (1), and one end of the second connection portion (202) away from the first connection portion (201) being connected to the circuit board (3).

4. The series battery assembly structure according to claim 3, characterized in that: In the array direction of the single battery cells (1), the length of the first connecting portion (201) is greater than the length of the second connecting portion (202).

5. The series battery assembly structure according to claim 3, characterized in that: The second connection portion (202) is arranged perpendicular to the first connection portion (201).

6. The series battery assembly structure according to claim 1, characterized in that: The battery pack further comprises an insulating adhesive component, the insulating adhesive component comprising a first insulating adhesive member (5), the first insulating adhesive member (5) being adhered to two adjacent single cells (1) and being located on both sides of the single cells (1), the first insulating adhesive member (5) covering a gap between the two adjacent single cells (1), the first insulating adhesive member (5) extending from one end of the single cell (1) away from the welding sheet (2) towards the circuit board (3).

7. The series battery assembly structure according to claim 6, characterized in that: One end of the first insulating adhesive member (5) away from the circuit board (3) covers a portion of the end surface of the single battery (1).

8. The series battery assembly structure according to claim 6, characterized in that: The battery pack further comprises a second insulating adhesive member (6), the battery pack comprises a plurality of battery cells arranged in the same direction, the second insulating adhesive member (6) covers the side surfaces of the battery cells located at the edge of the battery pack, and the second insulating adhesive member (6) extends from an end of the single battery cell (1) away from the welding sheet (2) in a direction close to the circuit board (3).

9. The series battery assembly structure according to claim 1 or 6, characterized in that: The battery pack further comprises a third insulating adhesive member (7), the third insulating adhesive member (7) comprising a first insulating member (701), a connecting wire (4) is provided on a side of the circuit board (3) away from the welding sheet (2), the first insulating member (701) passes through the connecting wire (4) and is covered on the periphery of the circuit board (3), and the first insulating member (701) is in contact with an end face of the single battery (1).

10. The series battery assembly structure according to claim 9, characterized in that: The third insulating adhesive member (7) further comprises a second insulating member (702) with openings at both ends, wherein the second insulating member (702) is sleeved on the outer circumference of the first insulating member (701).

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