Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises a first single battery, a second single battery and a battery protection plate. The heat generated when the first single battery works is greater than the heat generated when the second single battery works; the battery protection plate is provided with an extension part, the extension part protrudes towards the second single battery from the battery protection plate, and the extension part is used for enabling the heat transferred to the second single battery to be greater than the heat transferred to the first single battery when the battery protection plate works, so that the temperature difference between the first single battery and the second single battery is reduced; the voltage difference and the aging rate difference between the first single battery and the second single battery are reduced, and the performance and the service life of the battery pack are improved. In addition, the capacity difference between the first single battery and the second single battery can be reduced, and the phenomena that the capacity of the battery pack is sharply reduced and bumps occur during long-term use are avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack. Background Technology

[0002] Currently, lithium-ion batteries have become the preferred power source for 3C consumer electronics products (computers, communication devices, and consumer electronics). With the development of electric vehicles, portable devices, and other applications, in some special scenarios, it is necessary to connect irregularly shaped individual batteries together in a specific way to form battery packs.

[0003] However, the different shapes of the connected individual cells can lead to different internal resistances, resulting in different amounts of heat generated by the individual cells under high-power usage (the individual cells with higher internal resistance generate more heat and have higher temperatures, while the individual cells with lower internal resistance generate less heat and have lower temperatures). This, in turn, leads to a large temperature difference between individual cells of different shapes connected together.

[0004] When there is a temperature difference between connected individual battery cells, the warmer cells will charge or discharge faster, while the cooler cells will charge or discharge slower. This uneven charging and discharging leads to increased voltage differences and aging rates between the individual cells, thus affecting the performance and lifespan of the battery pack. Furthermore, the capacity of individual cells decreases at low temperatures and may increase at high temperatures. Therefore, temperature differences between connected cells can also cause inconsistencies in their capacity, which, over time, can lead to a sharp decline in the battery pack's capacity and bulging. Utility Model Content

[0005] The purpose of this invention is to provide a battery pack that can solve the technical problems in the prior art where the voltage difference and aging rate difference between individual cells in a battery pack composed of irregularly shaped individual cells increases, the capacity of the battery pack drops sharply, and bulging occurs.

[0006] To address the aforementioned problems, this utility model provides a battery pack. The battery pack includes a first direction and comprises a first single cell, a second single cell, and a battery protection board. The first and second single cells are spaced apart along the first direction. The heat generated by the first single cell during operation is greater than the heat generated by the second single cell during operation. The battery protection board is electrically connected to both the first and second single cells. The battery protection board has an extension that protrudes from the battery protection board toward the second single cell. The extension is used to ensure that the heat transferred to the second single cell during operation is greater than the heat transferred to the first single cell.

[0007] In some embodiments, the battery protection board includes a first circuit board having an extension that protrudes from the end face of the first circuit board near the second individual battery cell.

[0008] In some embodiments, the end face of the first circuit board away from the second individual battery cell is a plane.

[0009] In some embodiments, the battery pack further includes a second direction intersecting the first direction, the first circuit board extends along the second direction, and the first single cell, the first circuit board and the second single cell are arranged sequentially at intervals along the first direction.

[0010] In some embodiments, in a first direction, the distance between the first circuit board and the first single cell is a first distance, and the distance between the extension and the second single cell is a second distance, wherein the second distance is smaller than the first distance.

[0011] In some embodiments, the battery protection board further includes a second circuit board extending along a first direction and electrically connected to the first circuit board; the first single cell, the first circuit board, and the second single cell are located on the same side of the second circuit board in the second direction.

[0012] In some embodiments, the first circuit board includes a tab overlap portion that is electrically connected to a second single battery cell; in a second direction, at least one side of the tab overlap portion has an extension portion.

[0013] In some embodiments, the battery pack further includes a second direction intersecting the first direction; a first circuit board extends along the first direction, and a first single cell and a second single cell are located on the same side of the first circuit board in the second direction; the second single cell and the first circuit board are spaced apart along the second direction.

[0014] In some embodiments, the battery pack further includes a third direction that intersects both the first direction and the second direction; the battery protection board further includes a second circuit board that is electrically connected to the first circuit board; the second circuit board extends along the first direction and the second circuit board and the first circuit board are disposed along the third direction.

[0015] In some embodiments, the first circuit board includes one of a PCB and an FPC.

[0016] The advantages of this utility model are: The battery pack of this application includes a first single-cell battery and a second single-cell battery. The heat generated by the first single-cell battery during operation is greater than that generated by the second single-cell battery during operation. An extension is provided on the battery protection board, protruding from the battery protection board toward the second single-cell battery. Through the extension, the heat transferred from the battery protection board to the second single-cell battery during operation is greater than the heat transferred to the first single-cell battery, thereby reducing the temperature difference between the first and second single-cell batteries, reducing the voltage difference and aging rate difference between the first and second single-cell batteries, and improving the performance and lifespan of the battery pack. It can also reduce the capacity difference between the first and second single-cell batteries, avoiding a sharp drop in battery pack capacity and bulging during long-term use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an exploded schematic diagram of the battery pack of this application;

[0019] Figure 2 This is a top view of the first, second, and third individual cells of this application;

[0020] Figure 3 This is a side view of the first, second, and third individual cells of this application;

[0021] Figure 4 The battery pack in this application does not show an assembly diagram of the first protective film and the cover plate;

[0022] Figure 5 This is an assembly diagram of the first single cell, the second single cell, the third single cell, and the battery protection board of this application.

[0023] Figure 6 This is a top view of the battery protection board of this application;

[0024] Figure 7 yes Figure 5 Enlarged view of point A within the dashed box;

[0025] Figure 8 This is a structural schematic diagram of the frame of this application;

[0026] Figure 9 This is a side view of the frame of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Battery pack;

[0029] 1. First single cell; 2. Second single cell; 3. Third single cell; 4. Battery protection board; 5. Frame; 6. Cover plate; 7. First protective film; 8. Second protective film; 9. Extension;

[0030] 41. First circuit board; 42. Second circuit board; 411. Electrode overlap portion; 412. End;

[0031] 51. First receiving tank; 52. Second receiving tank; 53. Third receiving tank;

[0032] 81. First sub-protective film; 82. Second sub-protective film; 83. Third sub-protective film. Detailed Implementation

[0033] The preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings, in order to fully introduce the technical content of this utility model to those skilled in the art, and to demonstrate that this utility model can be implemented, making the disclosed technical content of this utility model clearer and enabling those skilled in the art to more easily understand how to implement this utility model. However, this utility model can be embodied in many different forms of embodiments, and the protection scope of this utility model is not limited to the embodiments mentioned herein. The following description of the embodiments is not intended to limit the scope of this utility model.

[0034] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", and "side", are only the directions shown in the accompanying drawings. The directional terms used in this document are for the purpose of explaining and illustrating this utility model, and are not intended to limit the scope of protection of this utility model.

[0035] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. Furthermore, for ease of understanding and description, the dimensions and thicknesses of each component shown in the drawings are arbitrary, and this invention does not limit the dimensions and thicknesses of each component.

[0036] Please see Figure 1 , Figure 1 This is an exploded view of the battery pack of this application. This embodiment provides a battery pack 100. The battery pack 100 includes intersecting first direction M, second direction N, and third direction P. In this embodiment, the first direction M, second direction N, and third direction P are perpendicular to each other.

[0037] Please see Figure 1The battery pack 100 includes: a first single cell 1, a second single cell 2, a third single cell 3, a battery protection board 4, a frame 5, a cover plate 6, a first protective film 7, a second protective film 8, and an extension 9.

[0038] Please see Figure 1 , Figure 2 and Figure 3 , Figure 2 This is a top view of the first, second, and third individual cells of this application; Figure 3 This is a side view of the first, second, and third individual cells of this application. The first individual cell 1 and the second individual cell 2 are spaced apart along a first direction M. In this embodiment, the second individual cell 2 is located to the right of the first individual cell 1. In other embodiments, the second individual cell 2 can also be located to the left of the first individual cell 1, or on one side of the second individual cell 2 along the second direction N, depending on actual needs.

[0039] Please see Figure 1 , Figure 2 and Figure 3 The heat generated by the first single-cell battery 1 during operation is greater than the heat generated by the second single-cell battery 2 during operation. In some embodiments, the internal resistance of the first single-cell battery 1 is greater than the internal resistance of the second single-cell battery 2, the dimension L1 of the first single-cell battery 1 in the first direction M is smaller than the dimension L2 of the second single-cell battery 2 in the first direction M, the dimension W1 of the first single-cell battery 1 in the second direction N is equal to the dimension W2 of the second single-cell battery 2 in the second direction N, and the dimension H1 of the first single-cell battery 1 in the third direction P is greater than the dimension H2 of the second single-cell battery 1 in the third direction P. This allows the capacity of the first single-cell battery 1 to be closer to that of the second single-cell battery 2, reducing the capacity difference between the first single-cell battery 1 and the second single-cell battery 2, and preventing a sharp drop in the capacity of the battery pack 100 and bulging during long-term use.

[0040] Please see Figure 1 , Figure 2 and Figure 3 The third cell 3 is spaced apart from the second cell 2 along the first direction M, and is located on the side of the second cell 2 away from the first cell 1. In other words, the first cell 1, the second cell 2, and the third cell 3 are spaced apart along the first direction M, and the first cell 1 and the third cell 3 are located on the left and right sides of the second cell 2, respectively.

[0041] Please see Figure 1 , Figure 2 and Figure 3The heat generated by the third battery cell 3 during operation is greater than that generated by the second battery cell 2 during operation. In this embodiment, the internal resistance of the third battery cell 3 is greater than that of the second battery cell 2, and the internal resistance of the third battery cell 3 is equal to that of the first battery cell 1. The dimension L1 of the first battery cell 1 in the first direction M is equal to the dimension L3 of the third battery cell 3 in the first direction M. The dimension W1 of the first battery cell 1 in the second direction N is equal to the dimension W3 of the third battery cell 3 in the second direction N. The dimension H1 of the first battery cell 1 in the third direction P is equal to the dimension H3 of the third battery cell 3 in the third direction P. In other words, the dimensions of the third battery cell 3 and the first battery cell 1 are exactly the same, which makes the capacity of the first battery cell 1 and the capacity of the third battery cell 3 tend to be consistent, reducing the capacity difference between the first battery cell 1 and the third battery cell 3, and avoiding the phenomenon of a sharp drop in the capacity of the battery pack 100 and bulging during long-term use. In other embodiments, the dimensions and internal resistance of the third battery cell 3 can also be adjusted according to the actual situation.

[0042] Please see Figure 5 and Figure 6 The battery protection board 4 is electrically connected to the first single cell 1, the second single cell 2, and the third single cell 3, respectively. The battery protection board 4 has an extension 9. The extension 9 protrudes from the battery protection board 4 toward the second single cell 2. The extension 9 is used to ensure that the heat transferred to the second single cell 2 during the operation of the battery protection board 4 is greater than the heat transferred to the first single cell 1, thereby reducing the temperature difference between the first single cell 1 and the second single cell 2, reducing the voltage difference and aging rate difference between the first single cell 1 and the second single cell 2, and improving the performance and life of the battery pack; it can also reduce the capacity difference between the first single cell 1 and the second single cell 2, and avoid the phenomenon of rapid capacity drop and bulging of the battery pack during long-term use.

[0043] Please see Figure 1 , Figure 4 , Figure 5 and Figure 6 , Figure 4 The battery pack in this application does not show an assembly diagram of the first protective film and the cover plate; Figure 5 This is an assembly diagram of the first single cell, the second single cell, the third single cell, and the battery protection board of this application. Figure 6This is a top view of the battery protection board of this application. The battery protection board 4 includes a first circuit board 41 and a second circuit board 42. The first circuit board 41 includes either a PCB or an FPC. In this embodiment, the first circuit board 41 is an FPC (Flexible Printed Circuit Board). The second circuit board 42 includes either a PCB or an FPC. In this embodiment, the second circuit board 42 is a PCB (Printed Circuit Board). Specifically, the end face of the first circuit board 41 away from the second individual battery 2 is planar. The first circuit board 41 has an extension 9 that protrudes from the end face of the first circuit board 41 near the second individual battery 2.

[0044] Please see Figure 6 In this embodiment, the first circuit board 41 extends along the second direction N, and the first single cell 1, the first circuit board 41, and the second single cell 2 are sequentially spaced along the first direction M. In other words, the first circuit board 41 is located between the first single cell 1 and the second single cell 2.

[0045] Please see Figure 5 and Figure 6 The second circuit board 42 extends along the first direction M and is electrically connected to the first circuit board 41; the first single cell 1, the first circuit board 41, the second single cell 2, and the third single cell 3 are all located on the same side of the second circuit board 42 in the second direction N.

[0046] Please see Figure 5 The tab of the first single-cell battery 1 is connected to one end of the second circuit board 42 in the first direction M to achieve an electrical connection between the first single-cell battery 1 and the second circuit board 42. The tab of the second single-cell battery 2 is connected to the first circuit board 41 to achieve an electrical connection between the second single-cell battery and the first circuit board 41, and the first circuit board 41 is connected to the second circuit board 42 to achieve an electrical connection between the first circuit board 41 and the second circuit board 42. The tab of the third single-cell battery 3 is connected to the other end of the second circuit board 42 in the first direction M to achieve an electrical connection between the third single-cell battery 3 and the second circuit board 42. Specifically, the tab of the second single-cell battery 2 is connected to the tab overlap portion 411 of the first circuit board 41 to achieve an electrical connection between the second single-cell battery and the first circuit board 41.

[0047] Please see Figure 7 , Figure 7 yes Figure 5The diagram shows an enlarged view of the area within the dashed box A. In the first direction M, the distance between the first circuit board 41 and the first individual battery 1 is a first distance T1, and the distance between the extension 9 and the second individual battery 2 is a second distance T2, which is smaller than the first distance T1. Therefore, during the use of the battery pack 100, the extension 9 allows more heat generated by the first circuit board 41 due to its internal resistance to be conducted to the second individual battery 2, thereby reducing the temperature difference between the first individual battery 1 and the second individual battery 2, reducing the voltage difference and aging rate difference between them, and improving the performance and lifespan of the battery pack. It also reduces the capacity difference between the first individual battery 1 and the second individual battery 2, preventing a sharp drop in the capacity of the battery pack 100 and the occurrence of bulging during long-term use.

[0048] Please see Figure 5 and Figure 6 The first circuit board 41 includes a tab connection portion 411 and at least one end portion 412, the end portion 412 being connected to at least one side of the tab connection portion 411 in the second direction N. The tab connection portion 411 is electrically connected to the second single-cell battery 2. Notably, the end portion 412 is also electrically connected to the second single-cell battery 2, but the difference is that the tab connection portion 411 directly connects to the second single-cell battery 2 to achieve electrical connection, while the end portion 412 is electrically connected to the second single-cell battery 2 through the tab connection portion 411. In this embodiment, the first circuit board 41 includes two ends 412, the two ends 412 being respectively connected to both sides of the tab connection portion 411 in the second direction N.

[0049] Please see Figure 5 and Figure 6 In the second direction N, an extension 9 is provided on at least one side of the tab overlap portion 411. Specifically, the extension 9 protrudes from the end 412 of at least one side of the tab overlap portion 411 toward the second single cell 2. In this embodiment, the extension 9 protrudes from the ends 412 of both sides of the tab overlap portion 411 toward the second single cell 2.

[0050] Please see Figure 5 , Figure 6 and Figure 7 The term "the end face of the first circuit board 41 away from the second single cell 2 is flat" means that the end face of the tab connection part 411 away from the second single cell 2 is flush with the end face of the end part 412 away from the second single cell 2.

[0051] Please see Figure 5 , Figure 6 and Figure 7The end face of the first circuit board 41 near the second single cell 2 is flat. In other words, the end face of the tab 411 near the second single cell 2 is flush with the end face of the end 412 near the second single cell 2.

[0052] In other embodiments, a first circuit board 41 extends along a first direction M, and a second circuit board 42 extends along the first direction M, with the second circuit board 42 electrically connected to the first circuit board 41. The second circuit board 42 and the first circuit board 41 are disposed along a third direction P. A first single-cell battery 1, a second single-cell battery 2, and a third single-cell battery 3 are located on the same side of the first circuit board 41 in a second direction N. Specifically, the first single-cell battery 1, the second single-cell battery 2, and the third single-cell battery 3 are all spaced apart from the first circuit board 41 along the second direction N. The tab of the first single-cell battery 1 is connected to the second circuit board 42, the tab of the second single-cell battery 2 is connected to the first circuit board 41, and the first circuit board 41 is connected to the second circuit board 42. Specifically, the extension 9 is located between the first circuit board 41 and the second single-cell battery 2. The first circuit board 41 is positioned at the midpoint of the second circuit board 42 in the first direction M, thereby bringing the extension 9 closer to the second individual battery cell 2. This extension 9 allows more heat generated by the first circuit board 41 during battery pack 100 use to be conducted to the second individual battery cell 2, reducing the temperature difference between the first and second individual batteries 1 and 2, decreasing the voltage and aging rate differences between them, and improving the performance and lifespan of the battery pack. It also reduces the capacity difference between the first and second individual batteries 1 and 2, preventing a sharp drop in the capacity of the battery pack 100 and bulging during long-term use.

[0053] Please see Figure 1 , Figure 4 and Figure 8 , Figure 8 This is a schematic diagram of the frame structure of this application. The frame 5 has a first receiving groove 51, a second receiving groove 52, and a third receiving groove 53. The first receiving groove 51, the second receiving groove 52, and the third receiving groove 53 are respectively used to receive the first single cell 1, the second single cell 2, and the third single cell 3.

[0054] Please see Figure 9 , Figure 9 This is a side view of the frame of this application. The surface of the first individual battery 1 away from the frame 5 is flush with the surface of the second individual battery 2 away from the frame 5, and also flush with the surface of the third individual battery 3 away from the frame 5. In this embodiment, the surface of the first individual battery 1 away from the frame 5 is flush with the surface of the frame 5 near the cover plate 6. In other embodiments, the surface of the first individual battery 1 away from the frame 5 may also be slightly lower than the surface of the frame 5 near the cover plate 6.

[0055] Please see Figure 9 The distance between the surface of the frame 5 away from the first single cell 1 and the surface of the first single cell 1 away from the frame 5 is a first distance H4. The distance between the surface of the frame 5 away from the second single cell 2 and the surface of the second single cell 2 away from the frame 5 is a second distance H5. The distance between the surface of the frame 5 away from the third single cell 3 and the surface of the third single cell 3 away from the frame 5 is a third distance H6. The first distance H4 is greater than the second distance H5, and the third distance H6 is greater than the second distance H5. In other words, the side of the frame 5 away from the cover plate 6 has a stepped portion between the first single cell 1 and the second single cell 2, and a stepped portion between the first single cell 1 and the third single cell 3, thereby raising the height of the surface of the second single cell 2 away from the frame 5, so that the surface of the first single cell 1 away from the frame 5 is flush with the surface of the second single cell 2 away from the frame 5, and also flush with the surface of the third single cell 3 away from the frame 5.

[0056] Please see Figure 1 The cover plate 6 is located on the side of the battery protection plate 4 facing the third direction P, and is positioned on the side of the battery protection plate 4 away from the frame 5. The cover plate 6 is primarily used to cover the battery protection plate 4, preventing it from being exposed and protecting it from the influence of the external environment. It also prevents dust, moisture, and other impurities from damaging the battery protection plate 4, thereby maintaining the safety and reliability of the battery pack 100. Notably, the surface of the cover plate 6 on the side away from the frame 5 is flush with the surface of the first individual battery cell 1 on the side away from the frame 5.

[0057] Please see Figure 1 The first protective film 7 covers the first individual battery 1, the second individual battery 2, the third individual battery 3, and the cover plate 6 on the side away from the frame 5, and extends to cover the side of the frame 5 away from the battery protection plate 4. In this embodiment, the first protective film 7 is a Mylar film. The first protective film 7 is mainly used to cover and protect the first individual battery 1, the second individual battery 2, the third individual battery 3, and the cover plate 6 underneath it, preventing short circuits and electrolyte leakage inside the battery pack 100. Identification codes, trademarks, and other information can also be sprayed on the first protective film 7.

[0058] Please see Figure 1The second protective film 8 includes a first sub-protective film 81, a second sub-protective film 82, and a third sub-protective film 83. The first sub-protective film 81, the second sub-protective film 82, and the third sub-protective film 83 respectively cover the side of the first individual battery 1, the second individual battery 2, and the third individual battery 3 away from the cover plate 6. In this embodiment, the second protective film 8 is a Mylar film. In this embodiment, since the first distance H4 is greater than the second distance H5, and the third distance H6 is greater than the second distance H5, the second protective film 8 includes the first sub-protective film 81, the second sub-protective film 82, and the third sub-protective film 83 arranged at intervals. The second protective film 8 is mainly used to cover and protect the first individual battery 1, the second individual battery 2, and the third individual battery 3 on it, preventing short circuits and electrolyte leakage inside the battery pack 100. Identification codes, trademarks, and other information can also be sprayed onto the second protective film 8.

[0059] The battery pack provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized by, The battery pack comprises a first direction (M), and comprises a first single battery (1), a second single battery (2) and a battery protection plate (4); The first single battery (1) and the second single battery (2) are arranged at intervals along the first direction (M), and the first single battery (1) generates more heat during operation than the second single battery (2); The battery protection plate (4) is electrically connected with the first single battery (1) and the second single battery (2) respectively, the battery protection plate (4) is provided with an extension (9), the extension (9) protrudes from the battery protection plate (4) towards the second single battery (2), and the extension (9) is used for making the heat transferred to the second single battery (2) during operation of the battery protection plate (4) greater than the heat transferred to the first single battery (1).

2. The battery pack of claim 1, wherein, The battery protection plate (4) comprises a first circuit board (41), and the first circuit board (41) is provided with the extension (9), and the extension (9) protrudes from an end face of the first circuit board (41) close to the second single battery (2).

3. The battery pack of claim 2, wherein, The end face of the first circuit board (41) away from the second single battery (2) is a plane.

4. The battery pack of claim 2, wherein, The battery pack further comprises a second direction (N) intersecting the first direction (M), the first circuit board (41) extends along the second direction (N), and the first single battery (1), the first circuit board (41) and the second single battery (2) are arranged at intervals along the first direction (M) in sequence.

5. The battery pack of claim 4, wherein, In the first direction (M), the distance between the first circuit board (41) and the first single battery (1) is a first distance, and the distance between the extension (9) and the second single battery is a second distance, and the second distance is less than the first distance.

6. The battery pack of claim 4, wherein, The battery protection plate (4) further comprises a second circuit board (42), the second circuit board (42) extends along the first direction (M), and the second circuit board (42) is electrically connected with the first circuit board (41); The first single battery (1), the first circuit board (41) and the second single battery (2) are located on the same side of the second circuit board (42) in the second direction (N).

7. The battery pack of claim 4, wherein, The first circuit board (41) comprises a tab lap joint portion (411), and the tab lap joint portion (411) is electrically connected with the second single battery (2); In the second direction (N), at least one side of the tab lap joint portion (411) is provided with the extension (9).

8. The battery pack of claim 2, wherein, The battery pack further comprises a second direction (N) intersecting the first direction (M); The first circuit board (41) extends along the first direction (M), and the first single battery (1) and the second single battery (2) are located on the same side of the first circuit board (41) in the second direction (N); The second single battery (2) and the first circuit board (41) are arranged at intervals along the second direction (N).

9. The battery pack of claim 8, wherein, The battery pack further comprises a third direction (P) intersecting the first direction (M) and the second direction (N); The battery protection plate (4) further comprises a second circuit board (42), and the second circuit board (42) is electrically connected with the first circuit board (41); the second circuit board (42) extends along the first direction (M), and the second circuit board (42) is arranged along the third direction (P) with the first circuit board (41).

10. The battery pack of any one of claims 2-9, wherein, The first circuit board (41) comprises one of a PCB and an FPC.

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