Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises a plurality of single batteries and a battery protection plate. The battery protection board comprises a first circuit board and a second circuit board, the first circuit board comprises a main body part and an extension part connected to the main body part, the second circuit board is connected to the main body part, and the single batteries are connected to the extension part, so that a connection circuit can be designed on the first circuit board, and only a protection circuit is designed on the second circuit board; the size of the second circuit board is reduced, the overall size of the battery protection board is further reduced, the size of the battery pack is reduced, and the energy density of the battery pack is improved. Moreover, only the protection circuit is designed on the second circuit board, and when the number of the single batteries is not changed, only the first circuit board needs to be adjusted and the second circuit board does not need to be adjusted according to the design scheme of different single batteries, so that the universal standardized design of the second circuit board can be realized.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] Currently, lithium-ion batteries have become the preferred power source for 3C consumer electronics (computers, communications, and consumer electronics). The battery protection board (BPC) in a lithium-ion battery is an integrated circuit board that protects the battery from overcharging, over-discharging, short circuits, and other issues.

[0003] Current battery protection boards consist solely of a rigid PCB, to which individual batteries are directly soldered. The PCB contains the battery cell series and parallel circuits and the protection circuit. With increasing demand for fast-charging capabilities and increasing currents, existing battery protection boards are becoming larger in size. Furthermore, existing battery protection boards require redesign for different batteries, making universal standardization of the PCB impossible. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack, which can solve the technical problems in the prior art of large design size of the battery protection board and poor versatility of the PCB hard board of the battery protection board.

[0005] In order to solve the above problems, the utility model provides a battery pack, which includes a first direction, a second direction and a third direction that intersect each other. The battery pack includes: a plurality of single cells, each single cell is arranged along the first direction; and a battery protection plate, which includes a first circuit board and a second circuit board. The first circuit board includes a main body and an extension connected to the main body. The main body extends along the first direction, and the extension extends along the second direction. The second circuit board is connected to the main body, and the single cells are connected to the extension.

[0006] In some embodiments, the extension portion is located on one side of the single battery in the first direction, and the tab of the single battery extends along the second direction and is connected to the extension portion.

[0007] In some embodiments, the single cell includes a first single cell and a second adjacent single cell, the extension portion includes a first extension portion, the first extension portion is located between the first single cell and the second single cell, the first single cell has a first pole tab, the second single cell has a second pole tab, the first pole tab and the second pole tab are both connected to the first extension portion, and the first pole tab and the second pole tab are arranged along the second direction.

[0008] In some embodiments, the single cell further includes a third single cell adjacent to the second single cell, the extension portion further includes a second extension portion, the second extension portion is located between the second single cell and the third single cell, the third single cell has a third pole ear, the third pole ear is connected to the second extension portion, and the size of the first extension portion in the second direction is greater than the size of the second extension portion in the second direction.

[0009] In some embodiments, the battery pack further includes: a connecting circuit, disposed on a first circuit board, electrically connected to the single cell, and used to electrically connect to an external device, through which the single cell is charged and discharged; and a protection circuit, disposed on a second circuit board.

[0010] In some embodiments, the first circuit board further includes a connecting portion protruding from the main body along the third direction, and an end of the connecting portion away from the main body is connected to the extending portion.

[0011] In some embodiments, a connecting piece is provided on a surface of one side of the extension portion in the third direction, and the single battery is connected to the connecting piece; wherein the connecting piece and the connecting portion are located on the same side of the extension portion in the third direction.

[0012] In some embodiments, the second circuit board is connected to one side of the main body in the third direction, and the second circuit board and the connecting portion are located on the same side of the main body in the third direction.

[0013] In some embodiments, the first circuit board and the second circuit board each include one of a PCB and an FPC.

[0014] In some embodiments, the battery pack further includes: a temperature acquisition device, disposed on the first circuit board.

[0015] The advantages of this utility model are as follows: the battery protection board of the present application includes a first circuit board and a second circuit board. The first circuit board includes a main body and an extension connected to the main body. The second circuit board is connected to the main body, and the single battery is connected to the extension. As a result, the connection circuit can be designed on the first circuit board, so that only the protection circuit is designed on the second circuit board, which reduces the size of the second circuit board, thereby reducing the overall size of the battery protection board, reducing the size of the battery pack, and improving the energy density of the battery pack. Moreover, since only the protection circuit is designed on the second circuit board, when the number of single batteries remains unchanged, the design scheme for different single batteries only requires adjusting the first circuit board, without adjusting the second circuit board. This allows for a universal and standardized design of the second circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 1 is an exploded schematic diagram of the battery pack of Example 1 of the present application;

[0018] Figure 2 This is a schematic diagram of the assembly of the battery protection board, single battery and first frame of Example 1 of the present application;

[0019] Figure 3 1 is a top view of the battery protection plate of Example 1 of the present application;

[0020] Figure 4 2 is a bottom view of the battery protection plate of Example 1 of the present application;

[0021] Figure 5 This is a front view of the battery protection board of Example 1 of the present application;

[0022] Figure 6 This is an exploded view of the battery protection board of Example 1 of the present application;

[0023] Figure 7 This is a schematic structural diagram of the first circuit board in Example 1 of the present application;

[0024] Figure 8 This is a schematic diagram of the assembly of the battery protection board, single battery and first frame of Example 2 of the present application;

[0025] Figure 9 2 is a top view of the battery protection plate of Example 2 of the present application;

[0026] Figure 10 2 is a bottom view of the battery protection plate of Example 2 of the present application;

[0027] Figure 11 This is an exploded view of the battery protection board of Example 2 of the present application.

[0028] Description of reference numerals:

[0029] 100. Battery pack;

[0030] 1. Single battery; 2. Battery protection board; 3. Temperature acquisition device; 4. First frame; 5. Second frame; 6. First protective film; 7. Second protective film;

[0031] 11. First single cell; 12. Second single cell; 13. Third single cell;

[0032] 110, tab; 1101, first tab; 1102, second tab; 1103, third tab;

[0033] 21. First circuit board; 22. Second circuit board;

[0034] 211. Main body; 212. Extension; 213. Connecting portion; 214. Connecting piece;

[0035] 2121. First extension portion; 2122. Second extension portion. DETAILED DESCRIPTION

[0036] The following describes in detail the preferred embodiments of the present invention in conjunction with the accompanying drawings to fully introduce the technical content of the present invention to those skilled in the art, to illustrate that the present invention can be implemented, to make the technical content disclosed in the present invention clearer, and to make it easier for those skilled in the art to understand how to implement the present invention. However, the present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments described herein. The description of the embodiments below is not intended to limit the scope of the present invention.

[0037] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only directions in the drawings. The directional terms used in this document are used to explain and illustrate the present invention, and are not used to limit the scope of protection of the present invention.

[0038] In the accompanying drawings, components with the same structure are represented by the same numerical labels, and components with similar structures or functions are represented by similar numerical labels. In addition, for the sake of ease of understanding and description, the size and thickness of each component shown in the accompanying drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component.

[0039] like Figure 1 As shown, this embodiment provides a battery pack 100. The battery pack 100 includes a first direction M, a second direction N, and a third direction P that intersect each other. In this embodiment, the first direction M, the second direction N, and the third direction P are perpendicular to each other.

[0040] The battery pack 100 includes: a plurality of single cells 1 , a battery protection board 2 , a temperature acquisition device 3 , a first frame 4 , a second frame 5 , a first protective film 6 and a second protective film 7 .

[0041] like Figure 1 and Figure 2As shown, multiple single cells 1 are arranged along a first direction M. In this embodiment, the single cells 1 include a first single cell 11 and a second single cell 12 that are adjacent to each other, and also include a third single cell 13 that is adjacent to the second single cell 12. In other words, the first single cell 11, the second single cell 12, and the third single cell 13 are arranged in sequence along the first direction M.

[0042] like Figure 1 and Figure 2 As shown, the battery protection board 2 includes a first circuit board 21 and a second circuit board 22. The first circuit board 21 and the second circuit board 22 each include one of a PCB and an FPC. In this embodiment, the first circuit board 21 is an FPC (Flexible Printed Circuit Board) and the second circuit board 22 is a PCB (Printed Circuit Board). In other embodiments, the first circuit board 21 and the second circuit board 22 may both be PCBs or both may be FPCs.

[0043] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the first circuit board 21 includes a main body portion 211 and an extension portion 212 connected to the main body portion 211 .

[0044] The main body 211 extends along a first direction M. The second circuit board 22 is connected to the main body 211. Specifically, the second circuit board 22 is connected to one side of the main body 211 in the third direction P. The first circuit board 21 is provided with a first connector (not shown) on one side in the third direction P, and the second circuit board 22 is provided with a second connector (not shown) on one side in the third direction P, and the first connector is connected to the second connector. In this embodiment, the first connector is connected to the second connector via a solder pad, and the first circuit board 21 and the second circuit board 22 are connected via a reflow soldering process.

[0045] The extension portion 212 extends along the second direction N. The single cell 1 is connected to the extension portion 212. Specifically, the extension portion 212 is located on one side of the single cell 1 in the first direction M, and the tab 110 of the single cell 1 extends along the second direction N and is connected to the extension portion 212. As a result, the connection circuit can be designed on the first circuit board 21, so that only the protection circuit is designed on the second circuit board 22, thereby reducing the size of the second circuit board 22, and further reducing the overall size of the battery protection board 2, reducing the size of the battery pack 100, and improving the energy density of the battery pack 100. Moreover, since only the protection circuit is designed on the second circuit board 22, when the number of single cells 1 remains unchanged, the design scheme for different single cells 1 only needs to adjust the first circuit board 21, and there is no need to adjust the second circuit board 22, thereby achieving a universal standardized design of the second circuit board 22.

[0046] It is worth noting that the tabs 110 of each single battery 1 include two positive and negative tabs. The tabs 110 of the single battery 1 extending along the second direction N means that the positive and negative tabs of the single battery 1 are arranged along the second direction N.

[0047] A connecting piece 214 is provided on a surface of the extension portion 212 on one side in the third direction P, and the single battery 1 is connected to the connecting piece 214. In this embodiment, the connecting piece 214 is a contact piece.

[0048] In this embodiment, the extending portion 212 includes a first extending portion 2121 and a second extending portion 2122 .

[0049] The first extension portion 2121 is located between the first cell 11 and the second cell 12. The first cell 11 has a first tab 1101, and the second cell 12 has a second tab 1102. Both the first tab 1101 and the second tab 1102 are connected to the first extension portion 2121, and the first tab 1101 and the second tab 1102 are arranged along the second direction N. In other words, the first extension portion 2121 is connected to both the first cell 11 and the second cell 12. By connecting both cells 1 to the same extension portion 212, the dimensions of the battery pack 100 in the first direction M can be effectively reduced, thereby increasing the energy density of the battery pack 100.

[0050] The second extension portion 2122 is located between the second cell 12 and the third cell 13. The third cell 13 has a third tab 1103 connected to the second extension portion 2122. Since the first extension portion 2121 is connected to two cells 1 simultaneously, and the second extension portion 2122 is connected to only one cell, the dimension of the first extension portion 2121 in the second direction N is larger than the dimension of the second extension portion 2122 in the second direction N.

[0051] In this embodiment, the first circuit board 21 further includes a connecting portion 213. The connecting portion 213 protrudes from the main body 211 along the third direction P, and one end of the connecting portion 213 away from the main body 211 is connected to the extension portion 212. The height of the extension portion 212 in the third direction P is adjusted by the connecting portion 213, so that the connecting piece 214 on the extension portion 212 can be connected to the tab 110 of the single battery 1. In other embodiments, the connecting portion 213 can also be removed according to actual circumstances. In this embodiment, the connecting piece 214 and the connecting portion 213 are located on the same side of the extension portion 212 in the third direction P. The second circuit board 22 and the connecting portion 213 are located on the same side of the main body 211 in the third direction P.

[0052] like Figure 1 、 Figure 4-Figure 7 As shown, the temperature acquisition device 3 is disposed on the first circuit board 21, thereby shortening the distance between the temperature acquisition device 3 and the battery cells 1, allowing for more flexible monitoring of the battery cell 1 temperature using the temperature acquisition device 3. In this embodiment, the temperature acquisition device 3 is an NTC patch. Generally speaking, the temperature of the second battery cell 12 located in the middle is higher than that of the first and third battery cells 11, 13 located at the edges. Therefore, in this embodiment, the temperature acquisition device 3 is disposed on the surface of the first extension portion 2121 facing the second battery cell 12. This allows for more flexible and accurate monitoring of the battery cell 1 temperature, preventing damage caused by excessive temperature.

[0053] The battery pack 100 further includes a connection circuit (not shown) and a protection circuit (not shown). The connection circuit is disposed on the first circuit board 21, electrically connected to the single cell 1, and is used to electrically connect to an external device. The single cell 1 is charged and discharged through the connection circuit. The protection circuit is disposed on the second circuit board 22. Only the protection circuit is designed on the second circuit board 22. When the number of single cells 1 remains unchanged, the design scheme for different single cells 1 only requires adjustment of the first circuit board 21, without the need to adjust the second circuit board 22. This allows for a universal standardized design of the second circuit board 22. For example, in battery pack designs such as flipping the second single cell 12 along the second direction N, flipping the second single cell 12 along the first direction M, and flipping only the tab 110 of the second single cell 12 along the second direction N, the battery protection board 2 only needs to adjust the first extension portion and the second extension portion to meet the circuit requirements, without the need to adjust the first circuit board 21.

[0054] Table 1

[0055]

[0056] As shown in Table 1, the comparative example is a solution in the prior art where the battery protection board consists solely of a PCB, the individual cells are directly soldered to the PCB, and the PCB contains the battery cell series-parallel circuits and the protection circuit. Example 1 is a solution in this application where the battery protection board 2 includes a first circuit board 21 and a second circuit board 22. The first circuit board 21 includes a main body 211 and an extension 212 connected to the main body 211. The second circuit board 22 is connected to the main body 211, and the individual cells 1 are connected to the extension 212.

[0057] In the comparative example and Example 1, the width of the battery pack 100 is reduced by 3.8 mm and the energy density of the battery pack is increased by 0.029. The energy density of the battery pack 100 of the present application is increased by 5.35% compared with the prior art.

[0058] The PCB hard board in the comparative example has a 6-layer structure, while the first circuit board 21 in Example 1 of the present application has a two-layer structure, and the second circuit board 22 has a 4-layer structure. The total number of layers of the battery protection board in the comparative example is the same as the total number of layers of the battery protection board in Example 1 of the present application, that is, the overall thickness of the battery protection board in the comparative example is almost the same as the overall thickness of the battery protection board in Example 1 of the present application. Moreover, since the thickness of the single battery is much greater than the overall thickness of the battery protection board 2, even if the overall thickness of the battery protection board in Example 1 of the present application is slightly greater than the overall thickness of the battery protection board in the comparative example, it will not affect the overall thickness of the battery pack 100. Therefore, the thickness of the battery pack in the comparative example is the same as the thickness of the battery pack in Example 1 of the present application.

[0059] like Figure 1 As shown, the first frame 4 is disposed on a side of the second circuit board 22 away from the first circuit board 21 .

[0060] like Figure 1 As shown, the second frame 5 is disposed on a side of the first circuit board 21 away from the second circuit board 22 .

[0061] like Figure 1 As shown, the first protective film 6 covers the side of the single battery 1 away from the first frame 4, and extends to cover the side of the first frame 4 away from the second circuit board 22. In this embodiment, the first protective film 6 is a Mylar film.

[0062] like Figure 1 As shown, the second protective film 7 covers the side of the single battery 1 away from the second frame 5 .

[0063] During the installation process of the battery pack 100 of the present application, the first circuit board 21 and the second circuit board 22 are first assembled to form a battery protection board 2, and then the single battery 1 is assembled with the battery protection board 2, and then the first frame 4 is assembled on the side of the second circuit board 22 away from the first circuit board 21, and then the second frame 5 is assembled on the side of the first circuit board 21 away from the second circuit board 22, and then the first protective film 6 is set on the side of the single battery 1 away from the first frame 4, and finally the second protective film 7 is covered on the side of the single battery 1 away from the second frame 5.

[0064] Example 2

[0065] like Figures 8-11 As shown, this embodiment includes most of the technical features of Example 1. The difference between this embodiment and Example 1 is that the first direction M in this embodiment is opposite to the first direction M in Example 1. Specifically, the first direction M in Example 1 is from left to right, while the first direction M in Example 2 is from right to left. The first single battery cell 11, the second single battery cell 12, and the third single battery cell 13 in Example 1 are arranged sequentially from left to right along the first direction M, while the first single battery cell 11, the second single battery cell 12, and the third single battery cell 13 in this embodiment are arranged sequentially from right to left along the first direction M.

[0066] like Figure 3 and Figure 9 As shown, the arrangement direction of the first single cell 11, the second single cell 12 and the third single cell 13 of this embodiment is changed, resulting in a change in the positions of the first pole tab 1101, the second pole tab 1102 and the third pole tab 1103. This embodiment only needs to change the positions of the first extension portion 2121 and the second extension portion 2122 to meet the circuit requirements without changing the second circuit board 22.

[0067] This embodiment differs from the first embodiment in that: in the first embodiment, the back and front surfaces of the first, second, and third cells 11, 12, and 13 are arranged along a third direction P, whereas in this embodiment, the front and back surfaces of the first, second, and third cells 11, 12, and 13 are arranged in a direction opposite to the third direction P. For example, in the first embodiment, the first extension portion 2121 is located on the left side of the second cell 12, whereas in this embodiment, the first extension portion 2121 is located on the right side of the second cell 12.

[0068] like Figure 3 、 Figure 4 、 Figure 9 and Figure 10As shown, the front and back surfaces of the first single cell 11, the second single cell 12, and the third single cell 13 of this embodiment have been changed, resulting in changes in the positions of the first tab 1101, the second tab 1102, and the third tab 1103. In this embodiment, only the position of the connecting piece 214 on the extension portion 212 needs to be changed to meet the circuit requirements, without having to change the second circuit board 22. For example, whereas the connecting piece 214 of the first embodiment is located on the surface of the extension portion 212 away from the first frame 4, in this embodiment, the connecting piece 214 is located on the surface of the extension portion 212 close to the first frame 4.

[0069] The above is a detailed introduction to a battery pack provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application. At the same time, for those skilled in the art, based on the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: The battery pack includes a first direction, a second direction, and a third direction intersecting each other, and the battery pack includes: a plurality of single cells (1), each of the single cells (1) being arranged along the first direction; and A battery protection board (2) comprises a first circuit board (21) and a second circuit board (22); the first circuit board (21) comprises a main body (211) and an extension portion (212) connected to the main body (211); the main body (211) extends along the first direction; the extension portion (212) extends along the second direction; the second circuit board (22) is connected to the main body (211); and the single battery (1) is connected to the extension portion (212).

2. The battery pack according to claim 1, wherein: The extension portion (212) is located on one side of the single battery (1) in the first direction, and the tab (110) of the single battery (1) extends along the second direction and is connected to the extension portion (212).

3. The battery pack according to claim 2, wherein: The single cell (1) comprises a first single cell (11) and a second single cell (12) adjacent to each other; the extension portion (212) comprises a first extension portion (2121); the first extension portion (2121) is located between the first single cell (11) and the second single cell (12); the first single cell (11) has a first pole tab (1101); the second single cell (12) has a second pole tab (1102); the first pole tab (1101) and the second pole tab (1102) are both connected to the first extension portion (2121); and the first pole tab (1101) and the second pole tab (1102) are arranged along the second direction.

4. The battery pack according to claim 3, wherein: The single cell (1) further comprises a third single cell (13) adjacent to the second single cell (12); the extension portion (212) further comprises a second extension portion (2122); the second extension portion (2122) is located between the second single cell (12) and the third single cell (13); the third single cell (13) has a third pole tab (1103); the third pole tab (1103) is connected to the second extension portion (2122); the size of the first extension portion (2121) in the second direction is larger than the size of the second extension portion (2122) in the second direction.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack further includes: a connecting circuit, provided on the first circuit board (21), the connecting circuit being electrically connected to the single battery (1), and the connecting circuit being used to be electrically connected to an external device, the single battery (1) being charged and discharged via the connecting circuit; and A protection circuit is arranged on the second circuit board (22).

6. The battery pack according to any one of claims 1 to 4, characterized in that: The first circuit board (21) further comprises a connecting portion (213), the connecting portion (213) protruding from the main body (211) along the third direction, and one end of the connecting portion (213) away from the main body (211) is connected to the extending portion (212).

7. The battery pack according to claim 6, characterized in that: The extending portion (212) is provided with a connecting piece (214) on a surface on one side in the third direction, and the single battery (1) is connected to the connecting piece (214); Wherein, the connecting piece (214) and the connecting portion (213) are located on the same side of the extending portion (212) in the third direction.

8. The battery pack according to claim 6, wherein: The second circuit board (22) is connected to one side of the main body (211) in the third direction, and the second circuit board (22) and the connecting portion (213) are located on the same side of the main body (211) in the third direction.

9. The battery pack according to any one of claims 1 to 4, characterized in that: The first circuit board (21) and the second circuit board (22) each include one of a PCB and an FPC.

10. The battery pack according to claim 1, wherein: Also includes: A temperature collecting device (3) is arranged on the first circuit board (21).

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