Battery pack

Abstract

The embodiment of the utility model provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a box body and a battery pack, the box body is provided with a containing cavity, the battery pack is arranged in the containing cavity, the battery pack comprises a plurality of single batteries arranged in the first direction, the battery pack is connected with two conducting bars, the two conducting bars are arranged in the second direction, and the side, away from the battery pack, of each conducting bar is provided with an insulating part; the edge of the insulating part exceeds the edge of the conducting bar, and the ratio of the size of the insulating part to the size of the conducting bar is larger than or equal to 1 and smaller than or equal to 1.1 in the second direction. According to the battery pack provided by the embodiment of the utility model, when the insulating part and the conducting bar are assembled, wrinkles are not easy to appear, and the assembly yield can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] A battery pack typically includes a housing, a wiring harness assembly, and a battery pack, with the wiring harness assembly and battery pack housed within the housing. The wiring harness assembly includes busbars and flexible printed circuits (FPCs). The busbars are electrically connected to the battery pack, and the flexible printed circuits are electrically connected to the busbars, enabling the acquisition of voltage and temperature data from the battery pack.

[0003] In related technologies, the battery pack also includes an insulating film, which is adhered to each conductive bar on the battery pack.

[0004] However, wrinkles are easily formed during the assembly of insulating films, which leads to a decrease in assembly yield. Utility Model Content

[0005] This utility model provides a battery pack to solve the problem that wrinkles easily occur during the assembly of insulating films, leading to a decrease in assembly yield.

[0006] This utility model embodiment provides a battery pack, including:

[0007] The housing has a receiving cavity;

[0008] A battery pack, wherein the battery pack is disposed within the receiving cavity, and the battery pack includes a plurality of battery cells arranged along a first direction;

[0009] The battery pack is connected to two conductive bars, which are arranged along a second direction. Each conductive bar has an insulating element on the side away from the battery pack, and the edge of the insulating element extends beyond the edge of the conductive bar.

[0010] Along the second direction, the size of the insulating element is L1, the size of the conductive busbar is L2, the ratio of L1 to L2 is greater than or equal to 1 and less than or equal to 1.1, wherein the units of L1 and L2 are both mm.

[0011] The battery pack provided in this embodiment of the utility model has an insulating component on the side of each conductive bar away from the battery pack. This allows for two insulating components to be separately arranged for each of the two conductive bars, reducing the area of ​​the insulating components. When assembling the insulating components with the conductive bars, wrinkles are less likely to occur, thus improving the assembly yield.

[0012] If the ratio of L1 to L2 is less than 1, the size of the insulating component along the second direction will be too small, resulting in exposed edges of the conductive busbar and a risk of insulation failure. If the ratio of L1 to L2 is greater than 1.1, the size of the insulating component along the second direction will be too large, causing the portion of the conductive busbar extending beyond the busbar to easily lift up, and foreign matter to easily adhere to this portion. By limiting the ratio of L1 to L2, the edges of the conductive busbar along the second direction can be prevented from being exposed, reducing the risk of insulation failure. Furthermore, the portion of the insulating component extending beyond the busbar along the second direction is less likely to lift up or attract foreign matter. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present utility model;

[0015] Figure 2 for Figure 1 Internal diagram of the lower shell;

[0016] Figure 3 A schematic diagram of the battery pack, conductive busbar, and insulating components assembled according to an embodiment of this utility model;

[0017] Figure 4 for Figure 3 An enlarged view of point A in the diagram;

[0018] Figure 5 A cross-sectional view of the battery pack, conductive busbar, insulating component and foam after assembly in the planes containing the Y and Z directions, provided for an embodiment of this utility model;

[0019] Figure 6 for Figure 5 Enlarged diagram of point B in the diagram;

[0020] Figure 7 for Figure 1 A schematic diagram of the battery pack after removing the top cover, foam, and insulation components;

[0021] Figure 8 for Figure 7 Enlarged view of point C in the diagram;

[0022] Figure 9 for Figure 1 A schematic diagram of the battery pack after removing the top cover;

[0023] Figure 10 for Figure 9 Enlarged diagram of point D in the diagram;

[0024] Figure 11 This is a structural schematic diagram of an insulating component provided in an embodiment of the present utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10-Box body; 11-Top cover; 12-Lower shell; 121-Side plate; 122-End plate; 123-Bottom plate; 13-Intermediate beam; 20-Battery pack; 21-Battery cell; 211-Electrode output terminal; 30-Conductive component; 40-Conductive busbar; 41-Aluminum bar; 50-Insulating component; 501-Notch; 51-Insulating layer; 60-Foam; 70-FPC. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] As described in the background section, wrinkles easily occur during the assembly of insulating films, leading to a decrease in assembly yield. The inventors discovered that this problem arises because the insulating film, which is bonded integrally to the various conductive bars on the battery pack, has a large area, making it prone to stress concentration. This stress concentration causes wrinkles to form during the assembly process, resulting in a lower assembly yield.

[0033] To address the aforementioned issues, this utility model provides a battery pack in which two conductive bars on the battery pack are respectively provided with two insulating components, i.e., each conductive bar is provided with one insulating component. This reduces the area of ​​the insulating components, making it less prone to stress concentration. When assembling the insulating components with the conductive bars, wrinkles are less likely to occur, thus improving the assembly yield.

[0034] The battery pack provided in the embodiments of this utility model will be described in detail below with reference to specific examples.

[0035] See Figure 1 As shown, this embodiment of the utility model provides a battery pack. For ease of description, a coordinate system is established for the battery pack. The length direction of the battery pack is the X-direction, i.e., the first direction is the X-direction. The width direction of the battery pack is the Y-direction, i.e., the second direction is the Y-direction. The height direction of the battery pack is the Z-direction, i.e., the third direction is the Z-direction. The first, second, and third directions are perpendicular to each other.

[0036] The battery pack includes a housing 10. The housing 10 has a receiving cavity.

[0037] The housing 10 includes an upper cover 11 and a lower shell 12. The lower shell 12 has an opening on the side facing the upper cover 11. The upper cover 11 closes the opening and is welded to the lower shell 12.

[0038] The top cover 11 and the bottom shell 12 can both be made of metal.

[0039] See in some examples Figure 2 As shown, the lower shell 12 includes two side plates 121, two end plates 122, and a bottom plate 123. The two side plates 121 are arranged opposite each other in a second direction, the two end plates 122 are arranged opposite each other in a first direction, and the bottom plate 123 and the upper cover 11 are arranged opposite each other in a third direction. The two side plates 121 are welded to the two end plates 122 respectively. The bottom plate 123 is welded to the side of the two side plates 121 and the two end plates 122 away from the upper cover 11. The upper cover 11 is welded to the side of the two side plates 121 and the two end plates 122 away from the bottom plate 123.

[0040] See Figure 3 As shown, the battery pack also includes battery pack 20. The number of battery packs 20 can be one or more.

[0041] In some examples, the battery pack includes multiple battery packs 20 arranged along a second direction. Adjacent battery packs 20 may be electrically connected to a conductive element 30 (see [reference]). Figure 7 As shown in the figure, two adjacent battery packs 20 are connected in series through the conductive element 30.

[0042] The conductive element 30 can be made of metal. In some examples, the conductive element 30 is made of aluminum.

[0043] In some examples, the battery pack 20 is disposed within a receiving cavity. See also Figures 3 to 5 As shown, the battery pack 20 includes a plurality of battery cells 21 arranged along a first direction. Each battery cell 21 has an electrode output terminal 211 on one side in the +Z direction, and the electrode output terminal 211 faces the upper cover 11.

[0044] See in some examples Figure 5 and Figure 6 As shown, the battery pack 20 is connected to two conductive bars 40, which are arranged along the second direction. The two conductive bars 40 are electrically connected to the electrode output terminals 211 of the battery pack 20, thereby realizing the series connection of multiple battery cells 21 of the battery pack 20.

[0045] The conductive bus 40 extends along a first direction. See, for example, [link to example]. Figure 3 As shown, the dimension of the conductive bus 40 in the first direction is L4.

[0046] See Figure 5 As shown, the dimension of the conductive bus 40 in the second direction is L2.

[0047] See Figure 5 and Figure 6 As shown, each conductive bar 40 has an insulating element 50 on the side facing away from the battery pack 20. The insulating element 50 can isolate the conductive bar 40 from the top cover 11 to prevent short circuit.

[0048] The insulating element 50 can be made of insulating material. The dielectric strength of the insulating element 50 can be greater than or equal to 15kV / mm, and the volume resistivity of the insulating element 50 can be greater than or equal to 10¹³Ω·cm, thus achieving the insulation effect.

[0049] In some examples, the insulating element 50 can be insulating tape. The insulating tape is made of ceramicized silicone tape.

[0050] In the example below, the insulating element 50 is shown and illustrated with insulating tape.

[0051] Insulating tape can be bonded to the conductive bar 40. The edge of the insulating element 50 extends beyond the edge of the conductive bar 40, so that the insulating element 50 covers the conductive bar 40, preventing the conductive bar 40 from contacting the top cover 11.

[0052] The insulating tape extends along a first direction. See, for example... Figure 3 As shown, the dimension of the insulating tape in the first direction is L3.

[0053] See Figure 5 As shown, the dimension of the insulating tape in the second direction is L1.

[0054] The ratio of L1 to L2 is greater than or equal to 1 and less than or equal to 1.1. For example, the ratio of L1 to L2 can be 1, 1.01, 1.02, 1.05, 1.06, 1.09 or 1.1, etc.

[0055] The units for L1 and L2 are both mm.

[0056] If the ratio of L1 to L2 is less than 1, the size of the insulating tape along the second direction will be too small, resulting in exposed edges of the conductive busbar 40 and a risk of insulation failure. If the ratio of L1 to L2 is greater than 1.1, the size of the insulating tape along the second direction will be too large, causing the portion of the insulating tape extending beyond the conductive busbar 40 to easily lift up, and foreign matter to easily adhere to this portion. By limiting the ratio of L1 to L2, the edges of the conductive busbar 40 along the second direction can be prevented from being exposed, reducing the risk of insulation failure. Furthermore, the portion of the insulating tape extending beyond the conductive busbar 40 along the second direction is less likely to lift up or adhere to foreign matter.

[0057] For example, L1 can be 76mm and L2 can be 70mm, so that the ratio of L1 to L2 is greater than or equal to 1 and less than or equal to 1.1.

[0058] The battery pack provided in this embodiment of the utility model has an insulating element 50 provided on the side of each conductive bar 40 away from the battery pack 20. This allows the two conductive bars 40 to correspond to the two separately provided insulating elements 50, which reduces the area of ​​the insulating element 50. When the insulating element 50 is assembled with the conductive bar 40, wrinkles are less likely to occur, thus improving the assembly yield.

[0059] In one possible implementation, the ratio of L3 to L4 is greater than or equal to 1.02 and less than or equal to 1.15. For example, the ratio of L3 to L4 can be 1.02, 1.05, 1.06, 1.08, 1.09, 1.11, 1.14, or 1.15, etc.

[0060] The units for L3 and L4 are both mm.

[0061] If the ratio of L3 to L4 is less than 1.02, the size of the insulating tape along the first direction will be too small, causing the edges of the conductive busbar 40 to be easily exposed, resulting in a risk of insulation failure. If the ratio of L3 to L4 is greater than 1.02, the size of the insulating tape along the first direction will be too large, causing the portion of the insulating tape extending beyond the conductive busbar 40 to easily lift up, and foreign matter to easily adhere to this portion. By limiting the ratio of L3 to L4, the edges of the conductive busbar 40 along the first direction are less likely to be exposed, reducing the risk of insulation failure. Furthermore, the portion of the insulating tape extending beyond the conductive busbar 40 along the first direction is less likely to lift up and less likely to attract foreign matter.

[0062] For example, L3 can be 1515mm and L4 can be 1470mm, so that the ratio of L3 to L4 is greater than or equal to 1.02 and less than or equal to 1.15.

[0063] In one possible implementation, see Figure 5 and Figure 6 As shown, along the second direction, the distance between the edge of the insulating tape and the edge of the conductive bar 40 is L5.

[0064] Where L5 is greater than or equal to 5mm and less than or equal to 10mm. For example, the value of L5 can be 5mm, 5.5mm, 6mm, 6.7mm, 7mm, 7.3mm, 8mm, 9mm or 10mm, etc.

[0065] If L5 is less than 5mm, the gap between the edge of the insulating tape and the edge of the conductive busbar 40 will be too small along the second direction, making the edge of the conductive busbar 40 easily exposed and increasing the risk of insulation failure. If L5 is greater than 10mm, the gap between the edge of the insulating tape and the edge of the conductive busbar 40 will be too large along the second direction, making the portion of the insulating tape extending beyond the conductive busbar 40 prone to lifting, and making the portion of the conductive busbar 40 extending beyond the conductive busbar 40 prone to foreign matter adhesion. By limiting the value of L5, the edge of the conductive busbar 40 is less likely to be exposed along the second direction, reducing the risk of insulation failure. It also prevents the portion of the insulating tape extending beyond the conductive busbar 40 along the second direction from lifting and from adhering to foreign matter.

[0066] In one possible implementation, see Figure 5 and Figure 6 As shown, in the direction perpendicular to the first and second directions, that is, in the third direction, the thickness of the insulating tape is L8.

[0067] Where L8 is greater than or equal to 0.3 mm and less than or equal to 1 mm. For example, the value of L8 can be 0.3 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.85 mm, 0.9 mm or 1 mm, etc.

[0068] If L8 is less than 0.3mm, the insulating tape will be too thin, and wrinkles will easily appear when assembling the insulating tape with the conductive busbar 40, leading to a decrease in assembly yield. If L8 is greater than 1mm, the insulating tape will be too thick, increasing the weight of the battery pack. By limiting the value of L8, wrinkles can be prevented from appearing when assembling the insulating tape with the conductive busbar 40, improving the assembly yield and reducing the weight of the battery pack.

[0069] In one possible implementation, see Figure 3 As shown, along the first direction, the distance between the edge of the insulating tape and the edge of the conductive bar 40 is L6.

[0070] Where L6 is greater than or equal to 10mm and less than or equal to 20mm. For example, the value of L6 can be 10mm, 11mm, 13mm, 14mm, 16mm, 19mm or 20mm, etc.

[0071] If L6 is less than 10mm, the gap between the edge of the insulating tape and the edge of the conductive busbar 40 will be too small along the first direction, making the edge of the conductive busbar 40 easily exposed and increasing the risk of insulation failure. If L6 is greater than 20mm, the gap between the edge of the insulating tape and the edge of the conductive busbar 40 will be too large along the first direction, making the portion of the insulating tape extending beyond the conductive busbar 40 prone to lifting, and making the portion of the conductive busbar 40 extending beyond the conductive busbar 40 prone to foreign matter adhesion. By limiting the value of L6, the edge of the conductive busbar 40 is less likely to be exposed along the first direction, reducing the risk of insulation failure. It also prevents the portion of the insulating tape extending beyond the conductive busbar 40 from lifting and from adhering to foreign matter.

[0072] In one possible implementation, see Figure 3 As shown, along the first direction, the edge of the insulating tape extends beyond the end face of the battery pack 20 by a distance of L7.

[0073] Where L7 is greater than or equal to 0 mm and less than or equal to 15 mm. For example, the value of L7 can be 0 mm, 1 mm, 9 mm, 10 mm, 12 mm, 14 mm or 15 mm, etc.

[0074] If L7 is greater than 15mm, the edge of the insulating tape will extend too far beyond the end face of the battery pack 20 along the first direction. This will cause the insulating tape to rub against other components of the battery pack (such as expansion beams, conductive copper busbars, or wiring harnesses). During battery pack use, vibration can easily cause the insulating tape to wear and break, leading to the risk of insulation failure. By limiting the value of L7, friction between the insulating tape and other components of the battery pack (e.g., along the first direction) can be reduced, thus lowering the risk of insulation failure.

[0075] In one possible implementation, see Figure 5 and Figure 6 As shown, the insulating tape has an insulating layer 51 on the side opposite to the conductive bar 40. The insulating layer 51 protects the insulating tape from punctures by burrs from metal parts of the battery pack (such as the top cover 11), thereby reducing the risk of insulation failure.

[0076] The material of the isolation layer 51 is polyethylene (PE) or polypropylene (PP).

[0077] In one possible implementation, see Figure 5 and Figure 6 As shown, the battery pack also includes a flexible printed circuit (FPC) 70, which extends along a first direction and whose branches are electrically connected to the busbar 40.

[0078] The FPC70 branch may include a nickel strip and a thermistor. The nickel strip can be electrically connected to the aluminum bar 41 of the conductive bus 40. The thermistor can be bonded to the aluminum bar 41.

[0079] Along the second direction, the overlap distance between the insulating tape and the FPC70 is greater than 0 mm. This setting allows the edge of the insulating tape to adhere to the FPC70, thereby integrating the FPC70 with the conductive busbar 40, improving integration, and also enhancing the stability of the FPC70 within the battery pack during use.

[0080] In one possible implementation, see Figure 7 and Figure 8 As shown, each conductive bus 40 includes multiple aluminum bars 41 distributed along a first direction, and the aluminum bars 41 connect to the electrode output terminals 211 of two adjacent battery cells 21. This arrangement enables the series connection of two adjacent battery cells 21.

[0081] In one possible implementation, see Figure 9 and Figure 10 As shown, foam 60 is provided on the side of the insulating tape opposite to the conductive bar 40, and foam 60 is bonded between the insulating tape and the housing 10. Specifically, foam 60 is bonded between the insulating tape and the top cover 11. With this arrangement, the top cover 11 can press the insulating tape tightly through the foam 60, which can make the insulating tape fit tightly against the conductive bar 40.

[0082] In the first direction, the size of foam 60 is L9.

[0083] The ratio of L9 to L4 is greater than or equal to 0.6 and less than or equal to 1. For example, the ratio of L9 to L4 can be 0.6, 0.65, 0.7, 0.76, 0.8, 0.9, or 1. The units for both L9 and L4 are mm.

[0084] If the ratio of L9 to L4 is less than 0.6, the size of the foam 60 will be too small along the first direction, resulting in the insulating tape not being compressed properly and causing poor adhesion between the insulating tape and the conductive busbar 40. If the ratio of L9 to L4 is greater than 1, the size of the foam 60 will be too large along the first direction, making it easier for foreign objects to adhere to the portion of the foam 60 extending beyond the conductive busbar 40. By limiting the ratio of L9 to L4, a strong adhesion between the insulating tape and the conductive busbar 40 can be ensured, and foreign objects are less likely to adhere to the portion of the foam 60 extending beyond the conductive busbar 40 along the first direction.

[0085] In one possible implementation, a middle beam 13 is provided inside the housing 10 (see...). Figure 2 (As shown).

[0086] The intermediate beam 13 can be made of metal.

[0087] The number of intermediate beams 13 can be one or more.

[0088] In some examples, a central beam 13 is provided inside the housing 10, which extends along a second direction. The central beam 13 can improve the strength of the battery pack, thereby improving the impact resistance of the battery pack.

[0089] The insulating tape extends along the first direction. The intermediate beam 13 is located on one side of the insulating tape in the -Z direction.

[0090] See Figure 11 As shown, the insulating tape has a notch 501 at the position corresponding to the intermediate beam 13 in the third direction. The notch 501 can release the shrinkage stress of the insulating tape during assembly.

[0091] The shape of the notch 501 can be arc-shaped, square, or other shapes.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing (10) has a receiving cavity; A battery pack (20) is disposed within the receiving cavity, the battery pack (20) comprising a plurality of battery cells (21) arranged along a first direction; The battery pack (20) is connected to two conductive bars (40), the two conductive bars (40) are arranged along the second direction, and each conductive bar (40) has an insulating member (50) on the side away from the battery pack (20), and the edge of the insulating member (50) extends beyond the edge of the conductive bar (40); Along the second direction, the size of the insulating element (50) is L1, the size of the conductive bus (40) is L2, the ratio of L1 to L2 is greater than or equal to 1 and less than or equal to 1.1, wherein the units of L1 and L2 are both mm.

2. The battery pack according to claim 1, characterized in that, Each of the conductive busbars (40) includes a plurality of aluminum bars (41) distributed along the first direction, the aluminum bars (41) connecting the electrode output terminals (211) of two adjacent battery cells (21), and the insulating member (50) extends along the first direction.

3. The battery pack according to claim 2, characterized in that, Along the first direction, the size of the insulating element (50) is L3, the size of the conductive bus (40) is L4, and the ratio of L3 to L4 is greater than or equal to 1.02 and less than or equal to 1.15; The units for L3 and L4 are both mm.

4. The battery pack according to claim 2, characterized in that, Along the second direction, the distance between the edge of the insulating element (50) and the edge of the conductive bus (40) is L5, where L5 is greater than or equal to 5 mm and less than or equal to 10 mm.

5. The battery pack according to claim 2, characterized in that, Along the first direction, the distance between the edge of the insulating element (50) and the edge of the conductive bus (40) is L6, where L6 is greater than or equal to 10 mm and less than or equal to 20 mm.

6. The battery pack according to claim 2, characterized in that, Along the first direction, the distance by which the edge of the insulating member (50) extends beyond the end face of the battery pack (20) is L7, where L7 is greater than or equal to 0 mm and less than or equal to 15 mm.

7. The battery pack according to claim 2, characterized in that, In a direction perpendicular to the first direction and the second direction, the thickness of the insulating element (50) is L8, which is greater than or equal to 0.3 mm and less than or equal to 1 mm.

8. The battery pack according to claim 3, characterized in that, The insulating component (50) has a foam (60) on the side opposite to the conductive bar (40), and the foam (60) is bonded between the insulating component (50) and the housing (10).

9. The battery pack according to claim 8, characterized in that, Along the first direction, the size of the foam (60) is L9, and the ratio of L9 to L4 is greater than or equal to 0.6 and less than or equal to 1; The units for L9 and L4 are both mm.

10. The battery pack according to any one of claims 1-9, characterized in that, The insulating element (50) has an insulating layer (51) on the side opposite to the conductive bus (40).

11. The battery pack according to any one of claims 1-9, characterized in that, It also includes a flexible circuit component that extends along the first direction, and the branch of the flexible circuit component is electrically connected to the conductive bus (40). Along the second direction, the overlap distance between the insulating component (50) and the flexible circuit component is greater than 0 mm.

12. The battery pack according to any one of claims 1-9, characterized in that, The housing (10) is provided with a middle beam (13), and the insulating component (50) is provided with a notch (501) corresponding to the position of the middle beam (13).

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