Battery pack

Abstract

The battery pack provided by the application relates to the technical field of batteries. The battery pack comprises a plurality of battery cells, a busbar, a circuit board and a battery sampling assembly. The battery sampling assembly comprises a metal sampling sheet and an insulating film. The battery sampling assembly is arranged across the first side and the second side of the plurality of battery cells of the battery pack. The metal sampling sheet comprises a body and a first end portion and a second end portion arranged at two ends of the body. The first end portion is used for electrically connecting with the busbar, and the second end portion is used for electrically connecting with the circuit board. The insulating film covers the body of the metal sampling sheet. The battery pack has a simple structure, facilitates information collection of the battery pack and has low cost.

Description

[0001] This application is a divisional application based on the parent application filed on July 18, 2022, entitled "Application No.: 2022108407400, Invention Title: Battery Sampling Component and Battery Pack". Technical Field

[0002] This invention relates to the field of battery technology, and more specifically, to a battery pack. Background Technology

[0003] Existing battery cells all have terminals on different sides, requiring the terminals on both sides to be connected to the same side for easy data collection from the battery pack. Current connection methods are complex, inefficient, and costly. Summary of the Invention

[0004] The object of the present invention includes, for example, providing a battery pack that simplifies the sampling structure and reduces costs.

[0005] The embodiments of the present invention can be implemented as follows: The present invention provides a battery, including multiple battery cells, a busbar, a circuit board, and a battery sampling assembly; The battery sampling component includes: A metal sampling sheet, the metal sampling sheet including a body and a first end and a second end disposed at both ends of the body, the first end being used for electrical connection with a busbar, and the second end being used for electrical connection with a circuit board; An insulating film that covers the body of the metal sampling sheet.

[0006] In an optional embodiment, the ratio of the width to the thickness of the metal sampling sheet is 10 to 100, and the thickness of the metal sampling sheet is greater than or equal to 0.05 mm.

[0007] In an optional embodiment, the body includes a first surface and a second surface disposed opposite to each other, and the insulating film covers the first surface and the second surface respectively.

[0008] In an optional embodiment, the thickness of the insulating film is 0.03 mm to 0.5 mm.

[0009] In an optional embodiment, the insulating film has through holes.

[0010] In an optional embodiment, the lengths of the first end and the second end are each greater than or equal to 5 mm.

[0011] In an optional embodiment, the metal sampling sheet is provided with a buffer section, the buffer section being adjustable in length.

[0012] In an optional embodiment, the first end and the second end are each provided with a straight section, the length of which is greater than or equal to 3 mm.

[0013] In an optional implementation, the number of metal sampling pieces may include multiple pieces, and the distance between two adjacent metal sampling pieces is greater than or equal to 2 mm.

[0014] In an optional embodiment, the first end of the metal sampling piece is welded to the busbar.

[0015] The beneficial effects of the embodiments of the present invention include, for example: The battery pack provided in this invention includes multiple battery cells, a busbar, a circuit board, and a battery sampling assembly. The battery sampling assembly includes a metal sampling plate and an insulating film disposed on the metal sampling plate. Both ends of the metal sampling plate are electrically connected to the busbar and the circuit board, respectively, thereby enabling sampling of the battery cells. The structure is simple, the metal sampling plate is easy to install and position, connection is convenient, and the cost is low. Furthermore, it facilitates battery pack assembly and helps improve sampling efficiency and stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of the battery pack provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the battery sampling component provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a first structure of a metal sampling sheet provided in an embodiment of the present invention; Figure 4 A schematic diagram of the first structure of the buffer section of the metal sampling sheet provided in an embodiment of the present invention; Figure 5 This is an exploded view of the first structure of the battery sampling component provided in an embodiment of the present invention; Figure 6 This is an exploded view of a second structure of the battery sampling assembly provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of a second structure of the metal sampling sheet provided in an embodiment of the present invention; Figure 8 A schematic diagram of a second structure of the buffer section of the metal sampling sheet provided in an embodiment of the present invention; Figure 9 A schematic diagram of a third structure of the buffer section of the metal sampling sheet provided in an embodiment of the present invention; Figure 10 This is a first-view structural schematic diagram of the battery pack provided in an embodiment of the present invention; Figure 11 for Figure 10 A magnified schematic diagram of the partial structure at point A in the middle; Figure 12 This is a second-view structural schematic diagram of the battery pack provided in an embodiment of the present invention; Figure 13 for Figure 12 A magnified schematic diagram of the local structure at point B; Figure 14 This is a schematic diagram of the circuit board provided in an embodiment of the present invention.

[0018] Icons: 100-Battery sampling assembly; 110-Metal sampling piece; 111-Body; 113-First end; 115-Second end; 117-Straight section; 121-First surface; 123-Second surface; 125-Side; 130-Buffer section; 131-First segment; 133-Second segment; 135-Arc segment; 137-First arc portion; 139-Second arc portion; 150-Insulating film; 151-Through hole; 200-Battery pack; 201-First side; 203-Second side; 210-Battery cell; 220-Busbar; 230-Circuit board; 231-Pin; 240-Isolation support plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] Existing battery cells all have terminals on different sides, requiring the terminals on both sides to be connected to the same side to facilitate the collection of battery pack information. Through long-term research, the inventors have found that most existing connection methods use either wire harness connection or flexible circuit board connection.

[0026] If a wire harness adapter is used, the structure is complex, there are many wire harnesses, the connection efficiency is low, and short circuits or missing connections are likely to occur. If a flexible circuit board adapter is used, it requires two adapters, which is also complex, inefficient, and costly.

[0027] Therefore, in order to overcome at least one of the defects of the prior art, this application proposes a battery pack 200, which has a simple structure, is easy to install, has high connection efficiency, and is conducive to reducing costs.

[0028] Please refer to Figures 1 to 3 This embodiment provides a battery pack 200, including multiple battery cells 210, a busbar 220, a circuit board 230, and a battery sampling assembly 100. The battery sampling assembly 100 is used to collect information from each battery cell 210 in the battery pack 200, including but not limited to current, voltage, and temperature. The battery sampling assembly 100 includes a metal sampling piece 110 and an insulating film 150. The metal sampling piece 110 includes a body 111 and a first end 113 and a second end 115 located at both ends of the body 111. The first end 113 is used for electrical connection with the busbar 220, and the second end 115 is used for electrical connection with the circuit board 230. The insulating film 150 covers the body 111 of the metal sampling piece 110. This battery sampling assembly 100 has a simple structure, the metal sampling piece 110 is easy to install and position, connection is convenient, assembly efficiency is high, and cost is low.

[0029] Optionally, the metal sampling sheet 110 may include, but is not limited to, one or more of the following: gold sheet, silver sheet, copper sheet, aluminum sheet, tin sheet, nickel sheet, iron sheet, or cobalt sheet.

[0030] Combination Figure 3 In this embodiment, the metal sampling sheet 110 is in the shape of a long, thin strip. This thin strip shape reduces weight and volume, which is beneficial for reducing the overall size and space occupied by the battery pack 200. The metal sampling sheet 110 extends from one side of the battery cell 210 to the other side, facilitating the transfer of the terminal from one side to the other. It should be understood that the metal sampling sheet 110 can be positioned above the battery cell 210, along its upper surface. Alternatively, it can be positioned below the battery cell 210, along its lower surface. Or, the metal sampling sheet 110 can be positioned along the side 125 of the battery cell 210, or it can be positioned in the middle of the battery cell 210, passing through the gap between adjacent cells 210, to connect the terminal on one side of the battery cell 210 to the circuit board 230 on the other side. Its placement path can be a straight line, a curve, or a broken line, etc., and is not specifically limited here.

[0031] Optionally, the cross-sectional shape of the metal sampling piece 110 can be square, rhomboid, rectangular, triangular, trapezoidal, elliptical, circular, or a combination of multiple shapes. Alternatively, the metal sampling piece 110 can adopt any other regular or irregular shape, without specific limitations.

[0032] Combination Figure 4 The ratio of the width W to the thickness T of the metal sampling piece 110 is between 10 and 100. Optionally, the thickness of the metal sampling piece 110 is greater than or equal to 0.05 mm, which helps to improve the connection strength between the metal sampling piece 110 and the circuit board 230 or bus 220.

[0033] The body 111 of the metal sampling sheet 110 includes a side surface 125 and a first surface 121 and a second surface 123 disposed opposite to each other. The side surface 125 is used to connect the first surface 121 and the second surface 123. An insulating film 150 covers the first surface 121 and the second surface 123 respectively. It is easy to understand that an insulating film 150 is provided on both sides of the metal sampling sheet 110 to improve the insulation of the metal sampling sheet 110 from other electrical components and prevent short circuits. In this embodiment, an insulating film 150 is provided on the first surface 121 and an insulating film 150 is provided on the second surface 123. The two insulating films 150 are pressed together on the side surface 125 of the metal sampling sheet 110. In this way, the side surface 125 of the metal sampling sheet 110 is also covered with an insulating film 150.

[0034] Of course, the insulating film 150 can be applied to the surface of the metal sampling sheet 110 by overlapping two layers of insulating film 150, i.e., the metal sampling sheet 110 is located between two layers of insulating film 150. Alternatively, an insulating film 150 can be wrapped around the surface of the metal sampling sheet 110, i.e., the insulating film 150 wraps around the metal sampling sheet 110. No specific limitation is made here.

[0035] Optionally, the metal sampling sheet 110 and the insulating film 150 can be fixed by adhesive bonding, which helps to improve the adhesion and connection stability between the insulating film 150 and the metal sampling sheet 110. Thermally conductive adhesive can be used to improve heat dissipation. The thickness of the insulating film 150 is 0.03 mm to 0.5 mm, for example, it can be 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or any value within this range. The thickness of the insulating film 150 should be understood as the thickness of the insulating film 150 covering one side of the metal sampling sheet 110. If the first surface 121 is covered with one layer of insulating film 150, the thickness of one layer of insulating film 150 is 0.03 mm to 0.5 mm. If the first surface 121 is covered with multiple layers of insulating film 150, the sum of the thicknesses of the multiple layers of insulating film 150 is 0.03 mm to 0.5 mm. The insulating film 150 may be made of one or more of the following materials: polypropylene (PP), polyethylene terephthalate (PET), polypropylene, and polyimide.

[0036] Combination Figure 5 and Figure 6 It should be noted that a battery sampling assembly 100 includes multiple metal sampling pieces 110 arranged side-by-side and spaced apart, meaning there are multiple metal sampling pieces 110. Optionally, the distance between two adjacent metal sampling pieces 110 is greater than or equal to 2 mm. Optionally, all metal sampling pieces 110 have the same length, resulting in higher sampling accuracy.

[0037] Each metal sampling piece 110 can be covered by an independent insulating film 150, or multiple metal sampling pieces 110 can be covered by a single insulating film 150. If multiple metal sampling pieces 110 are covered by a single insulating film 150, through holes 151 can be formed in the insulating film 150. These through holes 151 are spaced apart from the metal sampling pieces 110, meaning they are located between adjacent metal sampling pieces 110. The through holes 151 can reduce weight and dissipate heat.

[0038] Optionally, through holes 151 can be formed on both sides of the insulating film 150 of the metal sampling sheet 110, or through holes 151 can be formed on one side of the insulating film 150. If through holes 151 are formed on both sides of the insulating film 150, the through holes 151 on both sides can be correspondingly arranged or staggered. The staggered arrangement can be understood as a completely staggered arrangement or a partially staggered arrangement. The number, shape, and arrangement of the through holes 151 on the insulating film 150 can be flexibly adjusted according to the actual situation, and no specific limitation is made here. If the through holes 151 on both sides of the insulating film 150 are partially or completely correspondingly arranged, colloid or other media can be directly injected into the cell 210 through the through holes 151, which simplifies the production process of the battery pack 200 and improves the production efficiency of the battery pack 200.

[0039] Of course, in some embodiments, the through-hole 151 on the insulating film 150 may also be omitted, such as Figure 6 The insulating film 150 structure on one side of the first surface 121 of the body 111 shown.

[0040] It should be noted that the insulating film 150 only covers the body 111 portion of the metal sampling piece 110. The first end 113 and the second end 115 of the metal sampling piece 110, which serve as electrical connection terminals, are not covered by the insulating film 150. The first end 113 and the second end 115 are exposed metal portions, and the lengths of the first end 113 and the second end 115 are each greater than or equal to 5 mm to ensure a reliable electrical connection between the metal sampling piece 110 and the circuit board 230 or the bus 220.

[0041] Optionally, the first end 113 and the second end 115 are each provided with a straight section 117, the length of which is greater than or equal to 3 mm. The straight section 117 is used for the effective electrical connection area between the metal sampling piece 110 and the circuit board 230 or bus 220. For example, the straight section 117 is soldered to the circuit board 230 or bus 220. Setting the length of the straight section 117 to be greater than or equal to 3 mm helps to ensure the reliability and stability of the soldering, improve the soldering strength, and improve the stability of the electrical connection.

[0042] Optionally, the metal sampling piece 110 is provided with a buffer section 130, the length of which can be adjusted. The buffer section 130 helps solve installation problems caused by positional errors during installation, reducing installation accuracy requirements and allowing for smooth assembly within the allowable positioning error range, resulting in good compatibility. Furthermore, the buffer section 130 also prevents the metal sampling piece 110 from failing due to pulling caused by severe shaking or swaying during battery pack 200 use, providing a certain degree of shock absorption and cushioning.

[0043] The buffer section 130 can be located at any position on the metal sampling sheet 110, such as in at least one of the first end 113, the second end 115, and the body 111. Figure 3 Buffer sections 130 are respectively located at the first end 113 and the second end 115. For example... Figure 7 The buffer sections 130 are respectively provided at the first end 113, the second end 115 and the body 111. The cross-section of the buffer section 130 can be a bent surface or an arbitrary curved surface, and can be any shape such as arc, wave, W, U, V or Z, or pulse or spiral. The number of buffer sections 130 can be one or more, and no specific limitation is made here.

[0044] Optionally, combined Figure 4Taking a buffer section 130 located at the second end 115 as an example, the second end 115 includes interconnected buffer sections 130 and straight sections 117, with the buffer section 130 connected to the main body 111. Optionally, the buffer section 130 is an L-shaped bend, meaning the buffer section 130 includes interconnected first segments 131 and second segments 133. The first segment 131 is connected to the main body 111, and the second segment 133 is connected to the straight section 117. The first segment 131 extends downward from the main body 111, and the second segment 133 extends from the first segment 131 in a direction away from the main body 111. The straight section 117 extends from the second segment 133 in a direction away from the main body 111, meaning the straight section 117 extends downward and is parallel to the first segment 131. The connections between the first segment 131 and the main body 111, the second segment 133 and the first segment 131, and the straight segment 117 and the second segment 133 all use rounded transition connections to reduce stress concentration in the structure.

[0045] It should be noted that the orientation of the straight section 117 is not limited to the extension direction shown in the figure, and can be flexibly set according to actual needs. As long as it facilitates the soldering of the straight section 117 of the first end 113 to the bus 220, and facilitates the soldering of the straight section 117 of the second end 115 to the pin 231 of the circuit board 230, it is acceptable.

[0046] Combination Figure 8 Optionally, the buffer section 130 is an arc section 135, one end of which is connected to the main body 111 and the other end is connected to the straight section 117. The arc section 135 may be convex upward or concave downward, or be wavy; no specific limitation is made here.

[0047] Combination Figure 9 Optionally, taking the buffer section 130 located on the body 111 as an example, the buffer section 130 includes a first arc portion 137 and a second arc portion 139 connected to each other. The concave directions of the first arc portion 137 and the second arc portion 139 are opposite. The first arc portion 137 is connected to the body 111 near the second end 115, and the second arc portion 139 is connected to the body 111 near the first end 113. The first arc portion 137 protrudes upward, and the second arc portion 139 is concave downward. The first arc portion 137 and the second arc portion 139 are smoothly connected along the cross-section. The first arc portion 137 and the second arc portion 139 are respectively connected to the body 111 by a circular arc transition to reduce stress concentration in the structure.

[0048] Optionally, buffer sections 130 are provided on the first end 113, the second end 115, and the body 111, respectively. The shape and size of each buffer section 130 can be the same or different. The number of buffer sections 130 in each part of the metal sampling sheet 110 can be the same or different. For example, the first end 113 and the second end 115 are each provided with one buffer section 130, and the body 111 is provided with multiple buffer sections 130. No specific limitation is made here. Optionally, the entire metal sampling sheet 110 can be integrally formed or segmented, that is, the first end 113, the body 111, the second end 115, and the buffer sections 130 can be integrally formed or segmented.

[0049] Combination Figure 1 , Figures 10 to 14 This invention provides a battery pack 200, comprising multiple battery cells 210, a busbar 220, a circuit board 230, and a battery sampling assembly 100. The busbars 220 are disposed on both sides of the battery cells 210 and are electrically connected to the multiple battery cells 210 respectively. The circuit board 230 is disposed on one side of the battery cells 210. The busbars 220 located on the same side as the circuit board 230 are electrically connected to the circuit board 230. The battery sampling assembly 100 spans both sides of the battery cells 210, wherein a first end 113 is electrically connected to the busbar 220 on the side away from the circuit board 230, and a second end 115 is electrically connected to the circuit board 230. The busbar 220 on the side away from the circuit board 230 is transferred to the other side of the cell 210 by the metal sampling piece 110, which facilitates the collection of information of the cell 210 on the same side. The battery sampling component 100 of the battery pack 200 has a simple structure, is easy to connect, has high connection efficiency, and stable and reliable electrical connection, which is conducive to improving sampling efficiency and sampling stability, and has low production cost.

[0050] It is understood that the battery cell 210 includes a first side 201 and a second side 203 disposed opposite to each other. The first side 201 and the second side 203 are each provided with a terminal post, and the first side 201 and the second side 203 are each provided with a busbar 220. The busbar 220 of the first side 201 is electrically connected to the terminal post of the first side 201, and the busbar 220 of the second side 203 is electrically connected to the terminal post of the second side 203. Optionally, the first side 201 and the second side 203 are each provided with an isolation support plate 240. The isolation support plate 240 is disposed between the battery cell 210 and the busbar 220. The isolation support plate 240 can serve as a support and insulation barrier, and can also serve as a positioning tool during assembly.

[0051] The circuit board 230 is disposed on the first side 201 or the second side 203 of the battery cell 210. In this embodiment, the circuit board 230 is disposed on the first side 201 and is fixedly connected to the isolation support plate 240 on the first side 201. The circuit board 230 is also electrically connected to the busbar 220 on the first side 201. Optionally, the circuit board 230 is provided with a plurality of pins 231, each pin 231 being electrically connected to the second end 115.

[0052] The first end 113 of the metal sampling piece 110 is welded to the bus 220 of the second side 203. Welding methods include, but are not limited to, laser welding, resistance welding, or ultrasonic welding. Alternatively, the first end 113 and the bus 220 of the second side 203 can be connected by riveting, screws, or conductive adhesive. Similarly, the pin 231 is electrically connected to the second end 115 by methods including, but not limited to, laser welding, resistance welding, ultrasonic welding, riveting, screws, or conductive adhesive.

[0053] Optionally, in each battery pack 200, there may be one or more battery sampling components 100, and multiple battery sampling components 100 may be arranged side by side. The number of battery cells 210 and the size of the battery pack 200 may be flexibly adjusted to ensure that all the terminals of the second side 203 are transferred to the circuit board 230.

[0054] The battery pack 200 provided in this embodiment of the invention works on the following principle: A battery sampling assembly 100 is disposed across the first side 201 and the second side 203 of the battery cell 210. The first end 113 is electrically connected to the busbar 220 of the second side 203, and the second end 115 is electrically connected to the circuit board 230 of the first side 201. The busbar 220 of the second side 203 is connected to the circuit board 230 of the first side 201 via a metal sampling piece 110. The circuit board 230 of the first side 201 is electrically connected to the busbar 220 of the first side 201, thus allowing the circuit board 230 to simultaneously collect information from both sides of the battery cell 210.

[0055] In summary, the battery pack 200 provided in the embodiments of the present invention has the following beneficial effects, for example: The battery pack 200 provided in this embodiment of the invention includes a metal sampling sheet 110 and an insulating film 150 disposed on the metal sampling sheet 110. Both ends of the metal sampling sheet 110 are electrically connected to a busbar 220 and a circuit board 230, respectively, thereby enabling sampling of the battery cell 210. The structure is simple, the electrical connection is stable and reliable, the metal sampling sheet 110 is easy to install and position, convenient to connect, and low in cost. Furthermore, the metal sampling sheet 110 is made of thin metal sheet, making it small in size and light in weight. All metal sampling sheets 110 have the same length, resulting in higher sampling accuracy. The length of the metal sampling sheet 110 can be adjusted by setting a buffer section 130, facilitating installation and connection, reducing installation accuracy, and preventing problems such as tearing, breakage, or connection failure during use or movement. This battery pack 200 has a simple sampling structure, facilitates assembly, and helps improve sampling efficiency and stability.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells, busbars, circuit boards, and battery sampling components; The battery sampling component is used to collect information from multiple cells in the battery pack, including: an insulating film and a metal sampling sheet; The metal sampling sheet is in the shape of a long strip and includes a body and a first end and a second end located at both ends of the body; The insulating film covers the body; The ratio of the width to the thickness of the metal sampling sheet is between 10 and 100, and the thickness is greater than or equal to 0.05 mm. The battery sampling component is disposed across a first side and a second side of a plurality of battery cells of the battery pack, wherein the terminal post of the first side is electrically connected to a first busbar of the first side, the terminal post of the second side is electrically connected to a second busbar of the second side, and the second busbar is electrically connected to a circuit board of the second side. The first end is used for electrical connection with the first busbar, and the second end is used for electrical connection with the circuit board.

2. The battery pack according to claim 1, characterized in that, The first end or the second end is provided with a straight section, which is the electrical connection area between the metal sampling piece and the circuit board or the busbar, and the length of the straight section is greater than or equal to 3mm.

3. The battery pack according to claim 2, characterized in that, The metal sampling piece is provided with a buffer section, which is used to adjust the length of the metal sampling piece.

4. The battery pack according to claim 3, characterized in that, The buffer section is located at the first end and / or the second end. The buffer section includes a first segment and a second segment that are connected to each other. The first segment is connected to the body, and the second segment is connected to the straight segment.

5. The battery pack according to claim 3, characterized in that, The buffer section is disposed on the body, and the buffer section includes a first arc portion and a second arc portion that are connected to each other. The first arc portion and the second arc portion have opposite concave directions. The first arc portion is transitionally connected to the arc portion of the body near the second end, and the second arc portion is transitionally connected to the arc portion of the body near the first end.

6. The battery pack according to claim 1, characterized in that, The body includes a side surface, and a first surface and a second surface disposed opposite to each other, wherein the side surface is connected to the first surface and the second surface respectively; The insulating film includes a first insulating film and a second insulating film; The first surface is provided with the first insulating film, and the second surface is provided with the second insulating film. The first insulating film and the second insulating film are pressed together on the side.

7. The battery pack according to claim 1, characterized in that, When there are multiple metal sampling pieces, the distance between two adjacent metal sampling pieces is greater than or equal to 2 mm.

8. The battery pack according to claim 7, characterized in that, The insulating film simultaneously covers multiple metal sampling pieces, and the insulating film has through holes located between two adjacent metal sampling pieces.

9. The battery pack according to claim 1, characterized in that, The cross-sectional shape of the metal sampling sheet is square, rhomboid, rectangular, triangular, trapezoidal, elliptical, circular, or a combination of multiple shapes; The metal sampling plate is disposed above, below, or to the side of the plurality of battery cells.

10. The battery pack according to any one of claims 1 to 9, characterized in that, It also includes an isolation support plate disposed between the plurality of battery cells and the busbar.

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