Battery pack

Abstract

A battery pack, comprising a battery cell (1), a housing (2), a protective circuit board (3), and a conductive connecting piece (4). The housing (2) encloses the battery cell (1), and a first through hole (21) is provided at the top of the housing (2). The protective circuit board (3) is arranged on the outer side of the top of the housing (2). One end of the conductive connecting piece (4) is located in the housing (2) and is connected to a tab of the battery cell (1), and the other end thereof extends through the first through hole (21) to be connected to the protective circuit board (3). It can be seen that, in the battery pack, the protective circuit board (3) is connected to the tab of the battery cell (1) by means of the conductive connecting piece (4), thereby omitting an adapter plate and a circuit connected to the adapter plate in the prior art. Thus, the cost of materials and working time can be reduced; and the assembly process can be simplified, and the space utilization rate of a battery can be improved, facilitating the improvement in energy density of the battery.

Description

battery pack Technical Field

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

[0002] Currently, the trend toward cordless cleaning appliances (such as vacuum cleaners, steamers, and floor scrubbers) and power tools is becoming increasingly prominent. Cordless operation brings a wealth of convenience, allowing people to use tools more flexibly in their daily lives and work. There are two main types of cells used in cleaning appliance and power tool batteries. One type is a cylindrical cell encased in a hard shell (e.g., steel or aluminum), such as the 18650 and 21700 cells. The other type is a soft-pack cell, such as a liquid lithium-ion cell encased in a membrane-like shell (e.g., aluminum-plastic or steel-plastic).

[0003] Typically, a single battery cell cannot meet the power, voltage, and / or current requirements of handheld electrical devices, necessitating the integration of multiple cells into a battery pack. Consequently, multiple cells are typically enclosed in a housing to form a battery module to power the device. Pouch cells offer superior performance to cylindrical cells.

[0004] However, in the structure of soft-pack batteries, the tabs of each cell are usually fixedly electrically connected to the conductive connecting piece provided on the adapter board, and the conductive connecting piece is electrically connected to the connector on the adapter board, and the protection circuit of the circuit protection board is electrically connected to the connector. Therefore, the tabs of each cell are connected to the protection circuit of the circuit protection board through the conductive connecting piece and the connector. This makes the assembly process of this battery complex and costly.

[0005] Summary of the Invention

[0006] In view of this, the purpose of the present application is to provide a battery pack that can simplify the assembly process, improve the space utilization of the battery pack, and thus help increase the energy density of the battery.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] A battery pack, comprising:

[0009] battery cells;

[0010] A shell is provided on the outside of the battery cell, and a first through hole is provided on the top of the shell;

[0011] A protective circuit board is arranged on the outer side of the top of the housing;

[0012] A conductive connecting piece has one end located in the housing and connected to the tab of the battery cell, and the other end passing through the first through hole and connected to the protection circuit board.

[0013] Optionally, in the above battery pack, the conductive connecting piece includes:

[0014] a tab connection region connected to the tab;

[0015] a middle area connected to the tab connection area and bent upward relative to the tab connection area;

[0016] The protection plate connection area, the middle area is bent upward relative to the tab connection area and connected to the protection plate connection area, the protection plate connection area passes through the first through hole and is located in the second through hole of the protection circuit board and connected to the protection circuit board.

[0017] Optionally, in the above battery pack, the tab connection area is parallel to the tab to which it is connected.

[0018] Optionally, in the above-mentioned battery pack, a first patch is provided on the protection circuit board, the first patch is located on the side of the protection circuit board away from the battery cell and at least partially covers the second through hole, the protection board connection area passes through the first through hole and is at least partially located in the second through hole and connected to the first patch.

[0019] Optionally, in the above-mentioned battery pack, a solder pad is provided around the second through hole on the side of the protection circuit board away from the battery cell, and the middle area is bent upward relative to the tab connection area and then continues to bend toward the second through hole, so that the protection plate connection area can vertically pass through the second through hole.

[0020] Optionally, in the above battery pack, a groove is provided at the free end of the protection plate connection area.

[0021] Optionally, in the above battery pack, the width of the tab connection area is greater than or equal to the width of the middle area and the protection plate connection area.

[0022] Optionally, in the above battery pack, the first patch includes any one of a nickel sheet and a copper sheet, or a combination of multiple sheets.

[0023] Optionally, in the above battery pack, the conductive connecting sheet includes any one or a combination of nickel sheets, pure copper sheets or nickel-plated copper sheets.

[0024] Optionally, in the above battery pack, the conductive connecting piece is welded to the protection circuit board.

[0025] Optionally, in the above battery pack, at least one opening is provided on at least one side surface of the shell.

[0026] Optionally, in the above battery pack, the side surface where the opening is provided is provided with a reinforcing rib connecting two sides of the opening.

[0027] Optionally, the above-mentioned battery pack further includes a total positive connecting plate and a total negative connecting plate, two third through holes are provided on the top of the outer shell, two second patches and two fourth through holes are provided on the protection circuit board, the second patch is located on the side of the protection circuit board away from the battery cell and at least partially covers the fourth through hole, the total positive connecting plate and the total negative connecting plate are respectively connected to the total positive electrode ear and the total negative electrode ear of the battery cell module formed by multiple battery cells, and each independently passes through the third through hole and the fourth through hole to be connected to the second patch.

[0028] Optionally, in the above battery pack, the second patch includes a first connecting portion and a second connecting portion;

[0029] The first connecting portion is connected to the circuit protection board;

[0030] A boss is formed on the top of the shell, and the second connecting portion abuts against the boss.

[0031] Optionally, in the above battery pack, the multiple battery cells are fixed with double-sided adhesive foam or double-sided tape.

[0032] Optionally, in the above battery pack, foam is filled between the outer shell and the battery module formed by the multiple battery cells.

[0033] Optionally, in the above battery pack, the protection circuit board is substantially parallel to the top of the battery cell module formed by the plurality of battery cells.

[0034] Optionally, in the above-mentioned battery pack, the distance between the protection circuit board and the top sealing edges of the multiple battery cells is greater than or equal to 2 mm and less than or equal to 10 mm.

[0035] Optionally, in the above-mentioned battery pack, the protection circuit board can be fixed to the shell by at least one of screws, snaps, double-sided adhesive foam or hot melt.

[0036] Optionally, in the above-mentioned battery pack, a top sealing area of ​​the battery module formed by the multiple battery cells is provided with foam to provide support force to the top sealing area of ​​the battery module and prevent the tabs of the multiple battery cells from being short-circuited.

[0037] It can be seen from the above technical solution that the battery pack provided in this application connects the protective circuit board to the tabs of the battery cell through conductive connecting sheets, eliminating the adapter plate and the lines connecting the adapter plates in the prior art, thereby reducing material and labor costs, simplifying the assembly process, and improving the space utilization of the battery pack, which is beneficial to improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] FIG1 is a schematic structural diagram of a battery cell module provided in Example 1 of the present application;

[0040] FIG2 is a schematic structural diagram of a conductive connecting sheet provided in Example 1 of the present application;

[0041] FIG3 is a first structural diagram of a housing provided in Example 1 of the present application;

[0042] FIG4 is a second structural diagram of the housing provided in Example 1 of the present application;

[0043] FIG5 is a schematic structural diagram of a protection circuit board provided in Example 1 of the present application;

[0044] FIG6 is a schematic structural diagram of a conductive connecting sheet provided in Example 2 of the present application;

[0045] FIG7 is a schematic structural diagram of a protection circuit board provided in Example 2 of the present application.

[0046] in:

[0047] 1-battery cell,

[0048] 2-housing, 21-first through hole, 22-third through hole, 23-opening, 24-boss,

[0049] 3- Protective circuit board,

[0050] 31-second through hole, 32-first patch, 33-pad, 34-fourth through hole, 35-second patch,

[0051] 4-conductive connecting piece, 41-ear connecting area, 42-middle area, 43-protection plate connecting area, 431-groove,

[0052] 5-Foam. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the products in the embodiments of the application are usually placed when in use. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0055] Exemplary embodiment 1

[0056] As shown in FIG. 1 to FIG. 5 , an embodiment of the present application provides a battery pack.

[0057] The battery pack includes multiple battery cells 1, a housing 2, a protective circuit board 3, and a conductive connecting piece 4. The housing 2 is disposed around the exterior of the battery cells 1, and a first through-hole 21 is provided on the top of the housing 2. The protective circuit board 3 is disposed on the outside of the top of the housing 2. One end of the conductive connecting piece 4 is located within the housing 2 and connected to the tab of the battery cell 1, while the other end passes through the first through-hole 21 and connects to the protective circuit board 3, thereby connecting the battery cells 1 to the protective circuit board 3 and collecting information about the battery cells 1. The tabs of the multiple battery cells 1 are electrically connected, and the tabs (not shown) of the battery cells 1 and the conductive connecting piece 4 are stacked and then connected. The electrical connection between the tabs of the multiple battery cells 1 can be in series or in parallel, and those skilled in the art can make specific designs based on actual needs. For example, when multiple battery cells 1 are connected in series, the tabs of each battery cell 1 are connected in series to form a series of tabs, and the conductive connecting piece 4 is connected to one of the tabs in the series. For another example, when multiple battery cells 1 are connected in parallel, the tabs of each battery cell 1 are individually connected to the conductive connecting piece 4. In addition, the material of the housing 2 is plastic, but is not limited thereto. The specific material of the housing 2 can be designed by those skilled in the art according to actual needs.

[0058] It can be seen that the battery pack provided in the embodiment of the present application connects the protective circuit board 3 with the tabs of the battery cell 1 through the conductive connecting piece 4, eliminating the adapter plate and the circuit connecting the adapter plate in the prior art, thereby reducing material and labor costs, simplifying the assembly process, and improving the space utilization of the battery, which is beneficial to improving the energy density of the battery.

[0059] In a specific embodiment, the conductive connecting sheet 4 includes a tab connection region 41, an intermediate region 42, and a protective plate connection region 43. The tab connection region 41 is connected to the tab. The intermediate region 42 is connected to the tab connection region 41 and bends upward relative to the tab connection region 41. The intermediate region 42 bends upward relative to the tab connection region 41 and then connects to the protective plate connection region 43. The protective plate connection region 43 is located within the second through hole 31 of the protective circuit board 3 and is connected to the protective circuit board 3.

[0060] It should be noted that the middle area 42 bends upward to connect to the protection plate connection area 43, so that the tab connection area 41, the middle area 42, and the protection plate connection area 43 are not formed in the same plane. This can provide a buffer for the battery in high-intensity vibration or falling environments, prevent the tab of the battery cell 1 from breaking, and improve the mechanical reliability of the battery. In addition, the tab connection area 41 is parallel to the tab it is connected to, which facilitates the connection between the tab connection area 41 and the tab while increasing the contact area between the tab and the tab, which is conducive to improving the stability of the connection.

[0061] During specific implementation, the conductive connecting piece 4 is welded to the protective circuit board 3. The welded connection can provide a stable physical connection, can effectively fix the contact point between the conductive connecting piece 4 and the protective circuit board 3, can provide a permanent connection, and avoid accidental loosening or falling off. In addition, the welded connection can provide good electrical conductivity. Moreover, the metal bond between the welding point and the conductive connecting piece 4 can provide a low-resistance path, which is conducive to the flow of current. And the welded connection is usually stronger than other types of connection methods (such as pins or sockets). The welding point can withstand vibration, impact and mechanical stress, thereby providing a more reliable connection, especially in applications with high durability requirements. At the same time, the welded connection does not require additional pins or sockets, so a more compact layout and assembly can be achieved, which is particularly important for circuit board design with limited space.

[0062] In practice, the conductive connecting piece 4 is connected to the protective circuit board 3 using laser welding. A first patch 32 is provided on the protective circuit board 3. The first patch 32 is located on the side of the protective circuit board 3 away from the battery cell 1 and at least partially covers the second through-hole 31. The protective board connection area 43 is at least partially located within the second through-hole 31 and is welded to the first patch 32. The welding method between the conductive connecting piece 4 and the protective circuit board 3 is not limited to laser welding; those skilled in the art can design a specific method based on actual needs.

[0063] In specific implementations, the width of the tab connection region 41 is greater than or equal to the width of the middle region 42 and the protection plate connection region 43. The width of the tab connection region 41 must be sufficient to ensure the connection area between the tab and the conductive connecting piece 4. Reducing the width of the middle region 42 and the protection plate connection region 43 can save material, facilitate the passage of the middle region 42 through the first through-hole 21, and facilitate the passage of the protection plate connection region 43 through the second through-hole 31. Due to the smaller width of the middle region 42 and the protection plate connection region 43, the openings of the first through-hole 21 and the second through-hole 31 can be minimized, which can reduce the weakening effect of the openings on the structural strength, thereby improving the structural strength of the housing and the circuit protection board.

[0064] During specific implementation, the conductive connecting sheet 4 includes any one or more combinations of nickel sheets, pure copper sheets or nickel-plated copper sheets. Among them, nickel sheets have good electrical conductivity, corrosion resistance and mechanical strength, and are commonly used for connecting electronic equipment. The nickel sheet can be connected to the protection circuit board 3 by methods such as hot pressing welding, ultrasonic welding or laser welding. Pure copper sheet is an ideal conductive material with very low resistance and good electrical conductivity. It can be connected to the protection circuit board 3 by welding technology (such as soldering iron welding or arc welding). Nickel-plated copper sheet is a material whose surface is nickel-plated. This structure combines the electrical conductivity of copper with the corrosion resistance of nickel, so that the nickel-plated copper sheet has good electrical conductivity and can effectively prevent oxidation and corrosion. Nickel-plated copper sheets are often used in electronic equipment that requires high reliability and durability.

[0065] In summary, considering the conductive properties, corrosion resistance, mechanical strength, and specific application requirements of the conductive connecting sheet 4, an appropriate material for the conductive connecting sheet 4 is selected based on the welding technique and the material of the protective circuit board 3 to be connected to ensure welding quality and connection reliability. The specific material of the conductive connecting sheet 4 can be designed by those skilled in the art based on actual needs.

[0066] In a specific implementation, the first patch 32 includes any one of nickel and copper sheets or a combination thereof, but is not limited thereto. The specific material of the first patch 32 can be specifically designed by those skilled in the art according to actual needs.

[0067] In specific implementation, see Figure 3 for details, at least one opening 23 is provided on at least one side of the shell 2. The opening 23 may be provided on part of the side of the shell 2, or on all the sides of the shell 2. The side with the opening 23 is provided with reinforcing ribs (not shown in the figure) connecting the two sides of the opening 23. The reinforcing ribs may be provided above the opening 23 or below the opening 23, or both above and below the opening 23, to improve the strength and stability of the shell. At the same time, the space utilization rate can also be improved, thereby improving the overall energy density of the battery. In addition, it is conducive to the assembly work in the production process, and is suitable for application scenarios that do not require high battery strength, such as batteries for cleaning electrical appliances (such as vacuum cleaners).

[0068] However, the structure of housing 2 is not limited to this. As shown in FIG4 , the sides of housing 2 can be closed (i.e., the sides of housing 2 do not include openings 23). This provides housing 2 with excellent strength and dimensional stability. This structure is suitable for applications requiring high dimensional stability and high battery mechanical strength, such as power tool batteries. Whether housing 2 includes openings 23, as well as the specific locations and number of openings 23, can be determined by those skilled in the art based on practical needs.

[0069] In a specific implementation, it also includes a total positive connecting piece and a total negative connecting piece, which are respectively connected to the total positive tab and total negative tab of the battery module composed of multiple battery cells 1. The total positive connecting piece and the total negative connecting piece are respectively connected to the total positive tab and total negative tab of the battery module composed of multiple battery cells 1. They pass through the third through hole 22 on the top of the housing 2 and the fourth through hole 34 on the protection circuit board 3 to connect to the second patch 35 on the protection circuit board 3. The total positive tab is connected to the positive tab of each battery cell 1, and the total negative tab is connected to the negative tab of each battery cell 1.

[0070] It should be noted that the structure of the total positive connecting piece and the total negative connecting piece is the same as that of the conductive connecting piece 4, and will not be repeated here. Of course, those skilled in the art can also adjust the structure of the total positive connecting piece and the total negative connecting piece according to the needs of the specific application scenario.

[0071] It should be noted that the multiple battery cells 1 specifically include at least two battery cells 1, and the multiple battery cells 1 are fixed with double-sided adhesive foam or double-sided tape, but are not limited to this. The fixing form between the battery cells 1 can be specifically designed by those skilled in the art according to actual needs. In addition, the third through hole 22 is used to facilitate the passage of the total positive connecting piece and the total positive ear, the total negative connecting piece and the total negative ear when the battery cell 1 is installed in the shell 2. The battery cell module is fixed in the shell 2, and the protection circuit board 3 is installed in the corresponding position on the top of the shell 2 to be connected to the battery cell module.

[0072] In practice, the second patch 35 includes a first connecting portion and a second connecting portion; the first connecting portion is connected to the circuit protection board. A boss 24 is formed on the top of the housing 2, and the second connecting portion abuts against the boss 24. The main positive connector connects to the second connecting portion of the second patch 35, and the second connecting portion abuts against the boss 24. The boss 24 is thicker than the main body of the housing 2, preventing the main positive connector from welding through the housing 2 at the location of the boss 24 when connected to the second connecting portion, thus providing protection.

[0073] As shown in Figure 1, during specific implementation, foam 5 is set around the battery cell module, that is, foam 5 is filled between the shell 2 and the battery cell module. The foam 5 plays a buffering and shock-absorbing role, helping to reduce the impact of external impact and vibration on the battery cell module, and helping to extend the life of the battery cell 1. Moreover, the foam 5 is an insulating material and can provide electrical insulation protection between the battery cell module and the shell 2, which helps to prevent short circuits or current leakage between the battery cell module and the shell 2 and improve the safety of the device. In addition, the foam 5 has a certain degree of softness and adaptability, which can help ensure the stable positioning of the battery cell module in the shell 2. Then, the foam 5 fills the gap between the battery cell module and the shell 2 to reduce the movement and shaking of the battery cell module during the use of the device. In addition, in high-power devices, the heat generated by the battery cell module needs to be effectively dissipated. The foam 5 can help heat transfer to a certain extent, improve the heat dissipation effect, and keep the temperature of the battery cell 1 within a safe range.

[0074] During specific implementation, the battery module and the foam 5 are loaded into the outer shell 2, and the protection circuit board 3 is fixed to the outer shell 2 and electrically connected to the battery cell 1. After assembly, the protection circuit board 3 is parallel to the top of the battery module. It should be noted that the parallelism mentioned here is not parallel in the strict sense. Angle errors are allowed without affecting the use and safety of the battery structure itself. The distance between the protection circuit board 3 and the top sealing edge of the battery cell 1 is greater than or equal to 2 mm and less than or equal to 10 mm. The protection circuit board 3 can be fixed to the outer shell 2 by screws, snaps, double-sided adhesive foam or hot melt, but is not limited to this. The fixing method of the protection circuit board 3 and the distance from the top sealing edge of the battery cell 1 can be specifically designed by those skilled in the art according to actual needs.

[0075] During specific implementation, foam 5 is set in the top sealing area of ​​the battery cell module (that is, foam 5 is set in the area on one side of the battery cell 1 pole ear, and each pole ear is connected after bending, and foam 5 is set within the height range from the top of the battery cell 1 to the bending point of the pole ear). It can not only prevent the battery cell 1 pole ear from short-circuiting, but also provide support for the top area of ​​the battery cell module, thereby ensuring the structural strength of the battery cell module in the top area.

[0076] Exemplary embodiment 2

[0077] As shown in FIG6 and FIG7, the second embodiment of the present application provides a battery pack. The difference between the second embodiment of the present application and the first embodiment is that:

[0078] In a specific implementation, the conductive connecting piece 4 is connected to the protective circuit board 3 by soldering. A soldering pad 33 is provided around the second through hole 31 on the side of the protective circuit board 3 facing away from the battery cell 1. The middle area 42 is bent upward relative to the tab connection area 41 and then continues to bend toward the second through hole 31, so that the protective plate connection area 43 can vertically pass through the second through hole 31. The ability of the protective plate connection area 43 to vertically pass through the second through hole 31 can make the opening 23 of the second through hole 31 relatively small, thereby saving the connection area of ​​the protective circuit board 3 and increasing the layout space of the protective circuit board 3. The welding method between the conductive connecting piece 4 and the protective circuit board 3 is not limited to soldering, and those skilled in the art can make a specific design according to actual needs.

[0079] In a specific implementation, the free end of the protective plate connection area 43 is provided with a groove 431. This can increase the contact area between the solder and the part being welded, facilitating the welding operation. It should be noted that the number of grooves 431 can be specifically designed by those skilled in the art according to actual needs.

[0080] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to each other for the same or similar parts between the various embodiments. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in this field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that: include: Battery cell (1); A shell (2) is arranged to cover the outer side of the battery core (1), and a first through hole (21) is arranged on the top of the shell (2); A protective circuit board (3) is arranged on the outer side of the top of the housing (2); A conductive connecting sheet (4) has one end located inside the housing (2) and connected to the tab of the battery cell (1), and the other end passing through the first through hole (21) and connected to the protective circuit board (3).

2. The battery pack according to claim 1, characterized in that: The conductive connecting sheet (4) comprises: A tab connection area (41), connected to the tab; A middle area (42) connected to the tab connection area (41) and bent upward relative to the tab connection area (41); The middle area (42) is bent upward relative to the tab connection area (41) and connected to the protection plate connection area (43); the protection plate connection area (43) passes through the first through hole (21) and is located in the second through hole (31) of the protection circuit board (3) and connected to the protection circuit board (3).

3. The battery pack according to claim 2, characterized in that: The tab connection area (41) is parallel to the tab connected thereto.

4. The battery pack according to claim 2 or 3, characterized in that: The protection circuit board (3) is provided with a first patch (32), the first patch (32) is located on a side of the protection circuit board (3) away from the battery cell and at least partially covers the second through hole (31), and the protection board connection area (43) passes through the first through hole (21) and is at least partially located in the second through hole (31) to be connected to the first patch (32).

5. The battery pack according to any one of claims 2 to 4, characterized in that: A solder pad (33) is arranged around the second through hole (31) on the side of the protection circuit board (3) away from the battery cell (1), and the middle area (42) is bent upward relative to the tab connection area (41) and then continues to bend in a direction close to the second through hole (31), so that the protection board connection area (43) can vertically pass through the second through hole (31).

6. The battery pack according to any one of claims 2 to 5, characterized in that: The free end of the protection plate connection area (43) is provided with a groove (431).

7. The battery pack according to any one of claims 2 to 6, characterized in that: The width of the tab connection area (41) is greater than or equal to the width of the middle area (42) and the protection plate connection area (43).

8. The battery pack according to claim 4, characterized in that: The first patch (32) comprises any one of a nickel sheet and a copper sheet or a combination of multiple sheets.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The conductive connecting sheet (4) comprises any one of a nickel sheet, a pure copper sheet or a nickel-plated copper sheet, or a combination of multiple thereof.

10. The battery pack according to claims 1 to 9, characterized in that: The conductive connecting sheet (4) is connected to the protective circuit board (3) by welding.

11. The battery pack according to any one of claims 1 to 10, characterized in that: At least one opening (23) is provided on at least one side surface of the housing (2).

12. The battery pack according to claim 11, characterized in that: The side surface provided with the opening (23) is provided with reinforcing ribs connecting the two sides of the opening (23).

13. The battery pack according to any one of claims 1 to 12, characterized in that: The invention also comprises a total positive connection sheet and a total negative connection sheet, the top of the housing (2) is provided with two third through holes (22), the protection circuit board is provided with two second patches (35) and two fourth through holes (34), the second patches (35) are located on a side of the protection circuit board (3) away from the battery cell and at least partially cover the fourth through holes (34), the total positive connection sheet and the total negative connection sheet are respectively connected to the total positive electrode ear and the total negative electrode ear of the battery cell module formed by the plurality of battery cells (1), and each independently passes through the third through hole (22) and the fourth through hole (34) to be connected to the second patches (35).

14. The battery pack according to claim 13, characterized in that: The second patch (35) comprises a first connecting portion and a second connecting portion, the first connecting portion is connected to the circuit protection board, a boss (24) is formed on the top of the housing (2), and the second connecting portion abuts against the boss (24).

15. The battery pack according to claims 1 to 14, characterized in that: The multiple battery cells (1) are fixed to each other by using double-sided adhesive foam or double-sided tape.

16. The battery pack according to claims 1 to 15, characterized in that: Foam (5) is filled between the shell (2) and the battery cell module formed by the multiple battery cells (1).

17. The battery pack according to claims 1 to 16, characterized in that: The protective circuit board (3) is substantially parallel to the top of the battery cell module formed by the plurality of battery cells (1).

18. The battery pack according to claims 1 to 17, characterized in that: The distance between the protective circuit board (3) and the top sealing edges of the plurality of battery cells (1) is greater than or equal to 2 mm and less than or equal to 10 mm.

19. The battery pack according to claims 1 to 18, characterized in that: The protective circuit board (3) can be fixed to the housing (2) by at least one of screws, buckles, double-sided adhesive foam or hot melt.

20. The battery pack according to claims 1 to 19, characterized in that: The top sealing area of ​​the battery module formed by the multiple battery cells (1) is provided with foam (5) to provide support force to the top sealing area of ​​the battery module and prevent the tabs of the multiple battery cells (1) from being short-circuited.

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