Multi-string battery module

Abstract

The invention relates to a multi-string battery module. The multi-string battery module is composed of a battery cell group, a support assembly, a plurality of battery cell connecting pieces and a circuit board, the battery cell group enables the battery cell connecting pieces to be connected in series and / or in parallel to achieve required rated voltage, rated power or other electrical parameters through standard battery cell arrangement, and the battery cell connecting pieces are directly connected with the circuit board. The circuit board can conveniently read the state information of the battery cell to monitor and protect the battery cell, and meanwhile, the energy of the battery cell is transmitted to the output insertion piece of the circuit board. According to the invention, through standard battery cell arrangement, the battery cell connecting pieces are connected in series and / or in parallel to reach required rated voltage, rated power or other electrical parameters, and meanwhile, detection and energy charging and discharging of the battery cells are directly transmitted to the circuit board from the battery cells through the battery cell connecting pieces, so that the structure of the multi-string battery module is greatly simplified; and automatic production and assembly can be realized more easily.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a multi-series and multi-parallel battery module. Background Art

[0002] Handheld electric devices, such as power tools, garden tools, cleaning equipment, etc. Since these handheld electric devices are powered by battery packs, backpack batteries and other battery devices, they are free from the limitations of external power cords and can be widely used in different scenarios, which are favored by consumers in the market. At present, for multiple battery packs (number of series connections ≥ 10), the voltage detection of the battery cell is basically carried out by welding one end of the electric wire to one end of the battery cell connecting piece, and then the other end of the electric wire is plugged into the circuit board; when the number of battery packs in series is large, the use of electric wire connection will be unfavorable for automated production due to too many wiring harnesses, and the wiring and fixing are complicated. At the same time, automatic assembly cannot be achieved, and there are risks of cold soldering and tin slag after soldering. In order to solve these problems, a new design is made for the arrangement of battery cells, the series and parallel connection of battery cells, and the connection with the circuit board to simplify the structure and realize the automated production and assembly of battery packs. Summary of the invention

[0003] The present invention directly connects the cell connection sheet to the circuit board through a standardized cell arrangement, simplifies the battery pack structure, reduces the types of cell connection sheets, and is conducive to the automated production and assembly of the battery pack.

[0004] The multi-string battery module includes: a multi-string single-parallel battery module, a multi-string double-parallel battery module and a multi-string multi-parallel battery module, which are used to store electrical energy;

[0005] Wherein, the multi-string battery module comprises:

[0006] Battery cell group: the battery cell group is composed of M battery cells arranged in two rows in a staggered manner (M is a positive integer);

[0007] Bracket assembly: used to fix or limit the battery cell;

[0008] Multiple battery cell connecting pieces: the battery cell connecting pieces connect the battery cells in series and / or in parallel to achieve the required rated voltage, rated power or other electrical parameters;

[0009] Circuit board: used to read the battery status information to monitor and protect the battery.

[0010] In an embodiment of the present invention, a plurality of battery modules are included; wherein each of the battery modules includes a cell group, a bracket assembly, a plurality of cell connecting pieces and a circuit board; the cell group is composed of M cells arranged in two rows in a staggered manner (M is a positive integer); the bracket assembly is used to fix or limit the cells; the cell connecting pieces connect multiple cells in series and / or in parallel to achieve the required rated voltage, rated power or other electrical parameters; the circuit board directly extracts the cell status information from the cell connecting pieces to monitor and protect the cells, and also transmits energy to the plug-in piece of the circuit board through the cell connecting pieces. This solution solves the trouble of traditional multi-string battery modules (number of series connections ≥ 10) needing to extract cell status information through wires or FCC wiring, and at the same time designs a standardized cell arrangement, so that the overall structure of the multi-string battery module (number of series connections ≥ 10) is extremely simplified, which is conducive to the automated production and assembly of battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a 15-series single-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of the structure of one side of a 15-series single-parallel battery module provided in an embodiment of the present invention;

[0013] Figure 3 It is a structural schematic diagram of the other side of the 15-series single-parallel battery module provided in an embodiment of the present invention;

[0014] Figure 4 It is a structural schematic diagram of a 15-series dual-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention (embodiment 1);

[0015] Figure 5 This is a schematic diagram of the structure of one side of a 15-series dual-parallel battery module provided by an embodiment of the present invention (Example 1);

[0016] Figure 6 1 is a schematic diagram of the structure of the other side of the 15-series dual-parallel battery module provided in an embodiment of the present invention (Example 1);

[0017] Figure 7 It is a structural schematic diagram of a 15-series dual-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention (Example 2);

[0018] Figure 8 This is a schematic diagram of the structure of one side of a 15-series dual-parallel battery module provided by an embodiment of the present invention (Example 2);

[0019] Fig. 9 This is a schematic diagram of the structure of the other side of the 15-series dual-parallel battery module provided in an embodiment of the present invention (Example 2);

[0020] Fig.10It is a structural schematic diagram of a 15-series multi-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention;

[0021] Fig.11 This is a schematic diagram of the structure of one side of a 15-series multi-parallel battery module provided by an embodiment of the present invention;

[0022] Fig.12 It is a schematic diagram of the structure of the other side of the 15-series multi-parallel battery module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] Two rows of staggered battery cells refer to the staggered arrangement of battery cells in the 2M-1th row and battery cells in the 2Mth row (M is a positive integer).

[0026] Misalignment angle W: There are two ways to form the misalignment angle W. The first way is to use the angle (acute angle) of two straight lines passing through the centers of two battery cells respectively. The two battery cells passed by straight line 1 are adjacent battery cells in row 2M-1. One of the two battery cells passed by straight line 2 is adjacent to both battery cells in row 2M (the two battery cells forming straight line 1), and the other battery cell is any one of the two battery cells forming straight line 1. The second way is to use the angle (acute angle) of two straight lines passing through the centers of two battery cells respectively. The two battery cells passed by straight line 3 are adjacent battery cells in row 2M. One of the two battery cells passed by straight line 4 is adjacent to both battery cells in row 2M-1 (the two battery cells forming straight line 3), and the other battery cell is any one of the two battery cells forming straight line 3 (M is a positive integer).

[0027] Figure 1 It is a structural schematic diagram of a 15-series single-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention; Figure 2This is a schematic diagram of the structure of one side of a 15-series single-parallel battery module provided in an embodiment of the present invention; Figure 3 1 is a schematic diagram of the structure of the other side of the 15-series single-parallel battery module provided in an embodiment of the present invention; Figure 1 , 2 As shown in Figure 3, the 15-series single-parallel battery module includes a cell group 21, a bracket assembly 22, a plurality of cell connecting plates 23 and a circuit board 24. The cell group 21 is composed of two rows of staggered cells 211, and on the same end face of the bracket, the positive and negative poles of the first row of cells 211 and the second row of cells 211 are opposite. Multiple misalignment angles W will be formed between the two rows of staggered cells 211, and the misalignment angles W between the cells 211 can be adjusted according to the length and width of the battery module, and at least one misalignment angle W is within the range of 52° to 65°. Preferably, when the two rows of staggered cells 211 are arranged close to each other, the misalignment angles W between the two rows of staggered cells 211 are both 60°.

[0028] The support assembly 22 is used to fix or limit the battery cell 211 , and at the same time separate the battery cell connecting pieces 23 so that the battery cell connecting pieces 23 cannot be directly electrically connected to each other to avoid short circuit of the battery cell 211 .

[0029] The cell connection piece 23 connects multiple cells 211 in series, and the cell connection piece 23 connects the cells 211 arranged in a rightward offset manner in series to achieve the required rated voltage, rated power or other electrical parameters; each cell connection piece 23 is directly connected to the circuit board 24, so that the electrical parameters such as voltage, current and power of each series-connected cell 211 are directly transmitted to the circuit board 24 through each cell connection piece 23. The circuit board 24 monitors and protects the cell 211 by extracting the cell 211 status information from the cell connection piece 23, and can also transmit energy to the output plug of the circuit board 24 through the cell connection piece 23, so as to provide energy to the tool conveniently.

[0030] Figure 4 It is a structural schematic diagram of a 15-series dual-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention (embodiment 1); Figure 5 This is a schematic diagram of the structure of one side of a 15-series dual-parallel battery module provided by an embodiment of the present invention (Example 1); Figure 6 1 is a schematic diagram of the structure of the other side of the 15-series dual-parallel battery module provided in an embodiment of the present invention (Example 1); Figure 4 , 5As shown in Figure 6, the 15-series dual-parallel battery module (Example 1) includes a battery cell group 31, a bracket assembly 32, a plurality of battery cell connecting sheets 33 and a circuit board 34. The battery cell group 31 is composed of two rows of staggered battery cells 211, and on the same end surface of the bracket, the positive and negative poles of the first row of battery cells 211 and the second row of battery cells 211 are opposite; the positive and negative poles of the third row of battery cells 211 and the fourth row of battery cells 211 are opposite. The battery cell group is composed of two rows of staggered battery cells 211, and multiple staggered angles W are formed between each of the two rows of staggered battery cells 211. The staggered angles W between the battery cells 211 can be adjusted according to the length and width of the battery module, and at least one staggered angle W is within the range of 52° to 65°. Preferably, when two rows of staggered battery cells 211 are arranged close to each other, the staggered angle W between the two rows of staggered battery cells 211 is 60°.

[0031] The support assembly 32 is used to fix or limit the battery cell 211 , and at the same time separate the battery cell connecting pieces 33 so that the battery cell connecting pieces 33 cannot be directly electrically connected to each other to avoid short circuit of the battery cell 211 .

[0032] The cell connection piece 33 is connected in series and / or in parallel with multiple cells 211. The cell connection piece 33 connects the cells 211 arranged offset to the right in series to achieve the required rated voltage, and also connects the cells 211 arranged extending downward in parallel to achieve the required nominal capacity. In this way of electrical connection, the required rated voltage, rated power or other electrical parameters can be formed. Each cell connection piece 33 is directly connected to the circuit board 34, so that the electrical parameters such as voltage, current and power of each series and / or parallel cell 211 are directly transmitted to the circuit board 34 through each cell connection piece 33. The circuit board 34 monitors and protects the cell 211 by extracting the status information of the cell 211 from the cell connection piece 33, and can also transmit energy to the output plug of the circuit board 34 through the cell connection piece 33, so as to provide energy to the tool conveniently.

[0033] Figure 7 It is a structural schematic diagram of a 15-series dual-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention (Example 2); Figure 8 This is a schematic diagram of the structure of one side of a 15-series dual-parallel battery module provided by an embodiment of the present invention (Example 2); Fig. 9 1 is a schematic diagram of the other side structure of the 15-series dual-parallel battery module provided in an embodiment of the present invention (Example 2); Figure 7 , 8As shown in Figure 9, the 15-series dual-parallel battery module (Example 2) includes a battery cell group 41, a bracket assembly 42, a plurality of battery cell connecting sheets 43 and a circuit board 44. The battery cell group 41 is composed of two rows of staggered battery cells 211, and on the same end surface of the bracket, the positive and negative poles of the first row of battery cells 211 and the second row of battery cells 211 are opposite; the positive and negative poles of the third row of battery cells 211 and the fourth row of battery cells 211 are opposite. The battery cell group is composed of two rows of staggered battery cells 211, and multiple staggered angles W are formed between each of the two rows of staggered battery cells 211. The staggered angles W between the battery cells 211 can be adjusted according to the length and width of the battery module, and at least one staggered angle W is within the range of 52° to 65°. Preferably, when two rows of staggered battery cells 211 are arranged close to each other, the staggered angle W between the two rows of staggered battery cells 211 is 60°.

[0034] The bracket assembly 42 is used to fix or limit the battery cell 211 , and at the same time separate the battery cell connecting pieces 43 so that the battery cell connecting pieces 43 cannot be directly electrically connected to each other to avoid short circuit of the battery cell 211 .

[0035] The cell connection piece 43 is connected in series and / or in parallel with multiple cells 211. The cell connection piece 43 connects the cells 211 arranged offset to the right in series to achieve the required rated voltage, and also connects the cells 211 arranged extending downward in parallel to achieve the required nominal capacity. In this way of electrical connection, the required rated voltage, rated power or other electrical parameters can be formed. Each cell connection piece 43 is directly connected to the circuit board 44, so that the electrical parameters such as voltage, current and power of each cell 211 connected in series and / or in parallel are directly transmitted to the circuit board 44 through each cell connection piece 43. The circuit board 44 monitors and protects the cell 211 by extracting the status information of the cell 211 from the cell connection piece 43, and can also transmit energy to the output plug of the circuit board 44 through the cell connection piece 43, so as to provide energy to the tool conveniently.

[0036] Fig.10 It is a structural schematic diagram of a 15-series multi-parallel battery cell group and a bracket assembly provided in an embodiment of the present invention; Fig.11 This is a schematic diagram of the structure of one side of a 15-series multi-parallel battery module provided by an embodiment of the present invention; Fig.12 FIG. 1 is a schematic diagram of the structure of the other side of the 15-series multi-parallel battery module provided by an embodiment of the present invention. Fig.10 , 11As shown in Figure 12, the 15-series multi-parallel battery module includes a cell group 51, a bracket assembly 52, a plurality of cell connection sheets 53 and a circuit board 54. The cell group 51 is composed of N cells 211 arranged in two rows in a staggered manner, and on the same end surface of the bracket, the positive and negative poles of the cells 211 in the first row are opposite to those of the cells 211 in the second row; the positive and negative poles of the cells 211 in the third row are opposite to those of the cells 211 in the fourth row; and so on, the positive and negative poles of the cells 211 in the 2N-1 row are opposite to those of the cells 211 in the 2N row (N is a positive integer greater than or equal to 3). The cell group is composed of N cells 211 arranged in two rows in a staggered manner, and multiple stagger angles W are formed between each of the cells 211 arranged in two rows in a staggered manner. The stagger angles W between the cells 211 can be adjusted according to the length and width of the battery module, and at least one stagger angle W is within the range of 52° to 65°. Preferably, when two rows of staggered battery cells 211 are arranged close to each other, the staggered angle W between the two rows of staggered battery cells 211 is 60°.

[0037] The support assembly 52 is used to fix or limit the battery cell 211 , and at the same time separate the battery cell connecting pieces 53 so that the battery cell connecting pieces 53 cannot be directly electrically connected to each other to avoid short circuiting the battery cell 211 .

[0038] The cell connection piece 53 is connected in series and / or in parallel with multiple cells 211. The cell connection piece 53 connects the cells 211 arranged offset to the right in series to achieve the required rated voltage, and also connects the cells 211 arranged extending downward in parallel to achieve the required nominal capacity. In this way of electrical connection, the required rated voltage, rated power or other electrical parameters can be formed. Each cell connection piece 53 is directly connected to the circuit board 54, so that the electrical parameters such as voltage, current and power of each cell 211 connected in series and / or in parallel are directly transmitted to the circuit board 54 through each cell connection piece 53. The circuit board 54 monitors and protects the cell 211 by extracting the status information of the cell 211 from the cell connection piece 53, and can also transmit energy to the output plug of the circuit board 54 through the cell connection piece 53, so as to provide energy to the tool conveniently.

[0039] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A multi-string battery module, characterized in that: include: Battery cell group: the battery cell group is composed of M battery cells arranged in two rows in a staggered manner (M is a positive integer); Bracket assembly: used to fix or limit the battery cell; Multiple battery cell connecting pieces: the battery cell connecting pieces connect the battery cells in series and / or in parallel to achieve the required rated voltage, rated power or other electrical parameters; Circuit board: used to read the battery status information and monitor and protect the battery.

2. The multi-string battery module according to claim 1, characterized in that: When the module is a multi-series dual-parallel battery module, the cell group consists of two rows of staggered cells, and on the same end surface of the bracket, the positive and negative poles of the cells in the first row are opposite to those in the second row; the positive and negative poles of the cells in the third row are opposite to those in the fourth row.

3. The multi-string battery module according to claim 1, characterized in that: When the module is a multi-series and multi-parallel battery module, the cell group consists of N cells arranged in two rows in a staggered manner, and on the same end surface of the bracket, the positive and negative poles of the cells in the first row are opposite to those in the second row; the positive and negative poles of the cells in the third row are opposite to those in the fourth row; and so on, the positive and negative poles of the cells in the 2N-1th row are opposite to those in the 2Nth row (N is a positive integer greater than or equal to 3).

4. The multi-string battery module according to claim 2 or 3, characterized in that: When the module is a multi-string dual-parallel battery module or a multi-string multi-parallel battery module, the battery cell group is composed of multiple two rows of staggered battery cells, and multiple staggered angles W are formed between each two rows of staggered battery cells. The staggered angles W between the battery cells can be adjusted according to the length and width of the battery module, and at least one staggered angle W is within the range of 52° to 65°.

5. The multi-string battery module according to claim 4, characterized in that: When the battery module is a multi-string dual-parallel battery module or a multi-string multi-parallel battery module, the cell connecting piece connects the cells arranged offset to the right in series to achieve the required rated voltage, and also connects the cells arranged extending downward in parallel to achieve the required nominal capacity.

6. The multi-string battery module according to claim 5, characterized in that: When the battery module is a multi-string dual-parallel battery module or a multi-string multi-parallel battery module, the cell connecting piece not only connects the cells in series and / or in parallel to achieve the required rated voltage, rated power or other electrical parameters; but is also directly connected to the circuit board, so that the circuit board can directly read the status information of the cells through the cell connecting piece to monitor and protect the cells.

Images