Battery pack

Abstract

The utility model provides a battery pack which comprises a box body, a battery pack and a limiting piece, the box body comprises a bottom plate, an enclosure frame and a first beam, the bottom plate and the enclosure frame define a containing cavity, the first beam is located in the containing cavity and divides the containing cavity into at least two sub containing cavities, the battery pack is located in the sub containing cavities, and the battery pack comprises a battery pack body and an end insulating plate; the battery cell group body comprises a plurality of single batteries stacked in sequence, at least one end of the battery cell group body is provided with an end insulating plate, the limiting piece comprises a fixed section and a pressing section, and the fixed section is fixed with the first beam; a pressure-bearing groove is formed in the end insulating plate or a pressure-bearing protrusion is arranged on the side, close to the first beam, of the end insulating plate, the side, close to the bottom plate, of the abutting section abuts against the side, away from the bottom plate, of the pressure-bearing protrusion or abuts against the groove wall of the side, close to the bottom plate, of the pressure-bearing groove, and movement of the battery pack in the height direction of the battery pack is avoided.

Description

Technical Field

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

[0002] The battery pack houses the battery assembly. If the battery assembly shifts or moves along the height of the battery pack, it can easily damage the battery assembly, the housing, and other electrical connections within the housing, affecting the safe and reliable operation of the battery pack. Therefore, those skilled in the art need to address the issue of battery assembly shifting or moving along the height of the battery pack. Utility Model Content

[0003] To solve the above-mentioned technical problems, this application provides a battery pack, including a housing, a battery pack, and a limiting member. The housing includes a bottom plate, a frame, and a first beam. The bottom plate and the frame enclose a receiving cavity. The first beam is located inside the receiving cavity and divides the receiving cavity into at least two sub-receiving cavities. The battery pack is located inside the sub-receiving cavities. The battery pack includes a battery pack body and an end insulating plate. The battery pack body includes a plurality of sequentially stacked individual batteries. The end insulating plate is disposed at at least one end of the battery pack body. The limiting member includes a fixing section and a pressing section. The fixing section is fixed to the first beam.

[0004] The end insulating plate has a pressure-bearing protrusion on the side near the first beam. In a direction perpendicular to the base plate, the distance between the side of the pressure-bearing protrusion away from the base plate and the base plate is less than the distance between the side of the end insulating plate away from the base plate and the base plate. The pressing section abuts against the side of the pressure-bearing protrusion away from the base plate on the side near the base plate; or,

[0005] The end insulating plate has a pressure-bearing groove inside, and the pressure-bearing groove has an opening on the side away from the bottom plate. At least a portion of the pressure-bearing section extends into the pressure-bearing groove through the opening, and the side of the pressure-bearing section near the bottom plate abuts against the side wall of the pressure-bearing groove near the bottom plate.

[0006] The battery pack provided in this application has a limiting component, which includes a fixed section and a pressing section. The fixed section is fixed to the first beam, and the pressing section abuts against the side of the end insulating plate of the battery pack away from the bottom plate or the side of the pressure-bearing groove of the pressure-bearing groove near the bottom plate on the side of the bottom plate. In this way, the limiting component can provide the battery pack with a pressing force towards the bottom plate, thereby limiting the position of the battery pack in the height direction of the battery pack. This avoids the problem that the battery pack, the battery pack housing, and other electrical connectors inside the housing may be damaged due to the battery pack moving in the height direction of the battery pack, which would cause the battery pack to be unable to operate stably and reliably.

[0007] When a pressure-bearing protrusion is provided on the side of the end insulation plate near the first beam, since the distance between the side of the pressure-bearing protrusion away from the bottom plate and the bottom plate is less than the distance between the side of the end insulation plate away from the bottom plate and the bottom plate, a cavity can be formed on the side of the pressure-bearing protrusion on the end insulation plate away from the bottom plate. In this way, when the side of the pressing section near the bottom plate abuts against the side of the pressure-bearing protrusion on the end insulation plate away from the bottom plate, the pressing section must be at least partially located in the cavity. This can reduce the space occupied by the non-battery pack body and enable the battery pack to have a higher energy density.

[0008] When the end insulation plate is provided with a pressure-bearing groove, when the side of the pressure-bearing section near the bottom plate abuts against the side wall of the pressure-bearing groove of the end insulation plate near the bottom plate, the pressure-bearing section is at least partially located in the pressure-bearing groove. This can reduce the space occupied by the non-battery pack body in the box and enable the battery pack to have a higher energy density. Attached Figure Description

[0009] Figure 1 A perspective view of a partial structure of a battery pack according to an embodiment of this application;

[0010] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0011] Figure 3 for Figure 2 A partial perspective view;

[0012] Figure 4 A perspective view of a partial structure of another embodiment of the battery pack provided in this application;

[0013] Figure 5 for Figure 1 A 3D view of one of the limiting components;

[0014] Figure 6 for Figure 1 A three-dimensional view of another limiting component.

[0015] The annotations in the attached figures are explained as follows:

[0016] 1. Box body, 11. Enclosure frame, 12. First beam, 13. Second beam;

[0017] 2 battery packs, 21 end insulating plate, 211 pressure-bearing protrusion, 212 rib, 213 connecting protrusion, 214 pressure-bearing groove, 214a first groove wall, 22 single cell;

[0018] 3 limiting components, 31 fixing section, 31a connecting hole, 32 pressing section, 33 arc-shaped transition section. Detailed Implementation

[0019] This application provides a battery pack. To enable those skilled in the art to better understand the technical solution of this application, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, the battery pack provided in this application includes a housing 1, a battery pack 2, and a limiting member 3.

[0021] The housing 1 includes a base plate (not shown in the figure), a frame 11, and a first beam 12. The base plate and the frame 11 enclose a receiving cavity, and the first beam 12 is located inside the receiving cavity, dividing the receiving cavity into at least two sub-receiving cavities. The battery pack 2 is located in a sub-receiving cavity. In this embodiment, the housing 1 is provided with two first beams 12, which divide the receiving cavity into three sub-receiving cavities: left, middle, and right. The battery pack 2 is located in the middle sub-receiving cavity.

[0022] The battery pack 2 includes a battery pack body and an end insulating plate 21. The battery pack body includes a plurality of individually stacked cells 22. At least one end of the battery pack body is provided with an end insulating plate 21. In this embodiment, an end insulating plate 21 is provided at each of the two ends of the battery pack body.

[0023] like Figure 2 and Figure 3 As shown, the limiting member 3 includes a fixing section 31 and a pressing section 32, and the fixing section 31 is fixed to the first beam 12. In this embodiment, the end insulating plate 21 is provided with a pressure-bearing protrusion 211 on the side near the first beam 12. In the direction perpendicular to the bottom plate, the distance between the side of the pressure-bearing protrusion 211 away from the bottom plate and the bottom plate is smaller than the distance between the side of the end insulating plate 21 away from the bottom plate and the bottom plate. The side of the pressing section 32 near the bottom plate abuts against the side of the pressure-bearing protrusion 211 away from the bottom plate.

[0024] like Figure 4 As shown, the pressure-bearing protrusion 211 can also be replaced by a pressure-bearing groove 214. In this embodiment, the end insulating plate 21 is provided with a pressure-bearing groove 214 inside. The pressure-bearing groove 214 has an opening on the side away from the bottom plate. At least a portion of the pressing section 32 extends into the pressure-bearing groove 214 through the opening. The side of the pressing section 32 near the bottom plate abuts against the groove wall of the pressure-bearing groove 214 near the bottom plate.

[0025] The aforementioned battery pack is equipped with a limiting member 3, which includes a fixing section 31 and a pressing section 32. The fixing section 31 is fixed to the first beam 12. The pressing section 32, on the side near the bottom plate, abuts against the side of the pressure-bearing protrusion 211 of the end insulating plate 21 of the battery pack 2 away from the bottom plate or the side wall of the pressure-bearing groove 214 near the bottom plate. In this way, the limiting member 3 can provide the battery pack 2 with a pressing force towards the bottom plate, thereby limiting the position of the battery pack 2 in the height direction of the battery pack. This avoids the problem that the battery pack 2, the battery pack housing 1, and other electrical connectors inside the housing 1 may be damaged due to the battery pack moving in the height direction of the battery pack, thus preventing the battery pack from operating stably and reliably.

[0026] When a pressure-bearing protrusion 211 is provided on the side of the end insulating plate 21 near the first beam 12, since the distance between the side of the pressure-bearing protrusion 211 away from the bottom plate and the bottom plate is less than the distance between the side of the end insulating plate 21 away from the bottom plate and the bottom plate, a cavity can be formed on the side of the pressure-bearing protrusion 211 away from the bottom plate on the end insulating plate 21. In this way, when the side of the pressing section 32 near the bottom plate abuts against the side of the pressure-bearing protrusion 211 away from the bottom plate on the end insulating plate 21, the pressing section 32 must be at least partially located in the cavity. This can reduce the space occupied by the non-battery pack body in the housing 1, so that the battery pack has a higher energy density.

[0027] When the end insulating plate 21 is provided with a pressure-bearing groove 214, when the side of the pressing section 32 near the bottom plate abuts against the side wall of the pressure-bearing groove 214 of the end insulating plate 21 near the bottom plate, the pressing section 32 is at least partially located in the pressure-bearing groove 214, thereby reducing the space occupied by the non-battery pack body in the housing 1 and enabling the battery pack to have a higher energy density.

[0028] In some embodiments, such as Figure 2 and Figure 3 As shown, the fixing section 31 is fixed to the side of the first beam 12 away from the base plate, and the pressing section 32 bends from the side of the fixing section 31 near the battery pack 2 toward the base plate. Fixing the fixing section 31 to the side of the first beam 12 away from the base plate facilitates assembly. In the direction perpendicular to the base plate, the distance between the side of the pressure-bearing protrusion 211 away from the base plate and the base plate is less than the distance between the side of the first beam 12 away from the base plate and the base plate, so that the side of the pressing section 32 bending toward the base plate near the base plate can abut against the side of the pressure-bearing protrusion 211 away from the base plate.

[0029] In some embodiments, the pressure-bearing protrusion 211 abuts against the first beam 12 on the side away from the battery pack body. In this way, the pressure-bearing protrusion 211 increases the contact area between the end insulation plate 21 and the first beam 12, so that the first beam 12 provides better support for the end insulation plate 21 and can better reduce the deformation of the end insulation plate 21 during use.

[0030] In some embodiments, in the direction perpendicular to the base plate, the distance between the side of the end insulating plate 21 away from the base plate and the side of the end insulating plate 21 close to the base plate is L, and the distance between the side of the pressing section 32 close to the base plate and the side of the fixing section 31 close to the base plate is H, where 0.05 ≤ H / L ≤ 0.25. For example, the values ​​of H / L are 0.05, 0.1, 0.15, 0.2, and 0.25. Specifically, the range of L can be: 80mm ≤ L ≤ 100mm, for example, the values ​​of L are 80mm, 85mm, 90mm, 95mm, and 100mm. Specifically, the range of H can be: 5mm ≤ H ≤ 20mm, for example, the values ​​of H are 5mm, 10mm, 15mm, and 20mm.

[0031] When the distance L between the side of the end insulating plate 21 away from the base plate and the side of the end insulating plate 21 close to the base plate is constant, the larger the H / L ratio, the larger H becomes. H is the distance between the side of the pressing section 32 close to the base plate and the side of the fixing section 31 close to the base plate. The larger H is, the greater the height of the cavity used to accommodate the pressing section 32 needs to be, resulting in a larger area of ​​the end insulating plate 21 corresponding to the cavity. In the arrangement direction of the individual cells 22, the thickness of the area of ​​the end insulating plate 21 corresponding to the cavity is thinner than the thickness of the area not corresponding to the cavity. The insulation performance of the thinner area is not as good as that of the thicker area, and the thinner area is also more prone to breakage, which also affects the insulation performance. Therefore, the larger the area of ​​the end insulating plate 21 corresponding to the cavity, the more detrimental it is to the insulation performance of the end insulating plate 21. Therefore, in order to ensure the insulation performance of the end insulating plate 21, H / L cannot be too large.

[0032] When the distance L between the side of the end insulating plate 21 away from the bottom plate and the side of the end insulating plate 21 close to the bottom plate is constant, the smaller H / L is, the smaller H is. It is necessary to control the distance between the side of the pressure-bearing protrusion 211 away from the bottom plate and the side of the first beam 12 away from the bottom plate to be slightly less than H, so that when the fixing section 31 of the limiting member 3 is fixed to the side of the first beam 12 away from the bottom plate, the pressing section 32 of the limiting member 3 close to the bottom plate presses against the pressure-bearing protrusion 211 of the end insulating plate 21 of the battery pack 2 with appropriate force. The smaller H is, the more difficult it is to control the distance between the side of the pressure-bearing protrusion 211 away from the bottom plate and the side of the first beam 12 away from the bottom plate to be slightly less than H. Therefore, in order to ensure that it is relatively easy to control the distance between the side of the pressure-bearing protrusion 211 away from the bottom plate and the side of the first beam 12 away from the bottom plate to be slightly less than H, H / L cannot be too small.

[0033] By controlling H / L within the range of 0.05-0.25, this application can ensure the insulation performance of the end insulating plate 21 and also ensure that the distance between the side of the pressure-bearing protrusion 211 away from the bottom plate and the side of the first beam 12 away from the bottom plate is slightly less than H.

[0034] In some embodiments, in the arrangement direction of the individual cells 22, the distance between the side of the pressure-bearing protrusion 211 away from the battery pack body and the side of the pressure-bearing protrusion 211 close to the battery pack body is M, and the distance between the side of the pressure-bearing protrusion 211 away from the battery pack body and the side of the battery pack body close to the end insulating plate 21 is N, where 0.5 ≤ M / N ≤ 0.8. For example, the value of M / N can be 0.5, 0.6, 0.7, or 0.8. Specifically, the range of N can be 4mm ≤ N ≤ 12mm; for example, the value of N can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, or 12mm. The range of M can be 2mm ≤ M ≤ 8mm; for example, the value of M can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm.

[0035] When N is constant, the larger M / N is, the larger M is, and the smaller NM is, the worse the insulation performance of the end insulating plate 21 becomes. Therefore, to ensure the insulation performance of the end insulating plate 21, M / N cannot be too large. When N is constant, the smaller M / N is, the smaller M is, the more limited the contact area between the pressing section 32 and the pressure-bearing protrusion 211 becomes. This results in the contact area between the pressing section 32 and the pressure-bearing protrusion 211 being unable to be made larger, affecting the limiting performance of the limiting member 3 on the battery pack 2. Therefore, to ensure the limiting performance of the limiting member 3 on the battery pack 2, M / N cannot be too small. This application controls M / N within the range of 0.5-0.8, which can ensure both the insulation performance of the end insulating plate 21 and the limiting performance of the limiting member 3 on the battery pack 2.

[0036] The direction perpendicular to the base plate is defined as the first direction, the arrangement direction of each individual battery cell 22 is defined as the second direction, and the third direction is perpendicular to the first direction and the second direction.

[0037] In some embodiments, in the third direction, the length of the contact area between the pressing section 32 and the pressure-bearing protrusion 211 is A, and the length of the end insulating plate 21 is B, where 0.02 ≤ A / B ≤ 0.21. For example, the value of A / B can be 0.02, 0.05, 0.1, 0.15, 0.2, or 0.21. Specifically, the range of A can be 6mm ≤ A ≤ 30mm; for example, the value of A can be 6mm, 10mm, 15mm, 20mm, 25mm, or 30mm. Specifically, the range of B can be 148mm ≤ B ≤ 300mm; for example, the value of B can be 148mm, 150mm, 160mm, 170mm, 180mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, or 300mm.

[0038] When B is constant, the larger A / B is, the larger A is. A larger A requires a larger cavity to accommodate the pressure section 32, resulting in a larger area of ​​the end insulating plate 21 corresponding to the cavity, leading to poorer insulation performance of the end insulating plate 21. Furthermore, a larger A results in a heavier overall limiting member 3, which is detrimental to the lightweight design of the battery pack. Therefore, to ensure both the insulation performance of the end insulating plate 21 and the lightweight design of the battery pack, A / B cannot be too large. Conversely, when B is constant, the smaller A / B is, the smaller A is. A smaller A results in a smaller contact area between the pressure section 32 and the pressure-bearing protrusion 211, affecting the limiting performance of the limiting member 3 on the battery pack 2. Therefore, to ensure the limiting performance of the limiting member 3 on the battery pack 2, A / B cannot be too small. This application controls A / B within the range of 0.02-0.21, which ensures both the insulation performance of the end insulating plate 21 and the lightweight design of the battery pack, as well as the limiting performance of the limiting member 3 on the battery pack 2.

[0039] In some embodiments, such as Figure 5 As shown, the limiting member 3 includes multiple pressing sections 32, which are arranged sequentially at intervals in a third direction. In this embodiment, the limiting member 3 includes two pressing sections 32, but in actual implementation, the limiting member 3 may also include more than two pressing sections 32.

[0040] The abutting sections 32 of the limiting member 3 are arranged sequentially and at intervals in the third direction, so that the abutting areas of the limiting member 3 and the pressure-bearing protrusion 211 are distributed in the third direction. With the same abutting area, a distributed abutting area is more conducive to improving the limiting performance of the limiting member 3 in limiting the battery pack 2 than a concentrated abutting area. In other words, with the same limiting performance, a distributed abutting area requires a smaller abutting area than a concentrated abutting area. Therefore, the size of the abutting sections 32 of the limiting member 3 can be set smaller, making the limiting member 3 lighter and more conducive to the weight reduction of the battery pack.

[0041] In some embodiments, all the pressing sections 32 of the same limiting member 3 abut against the pressure-bearing protrusions 211 or pressure-bearing grooves 214 of the end insulating plate 21 of the same battery pack 2.

[0042] In some embodiments, at least two abutting sections 32 of the same limiting member 3 abut against the pressure-bearing protrusions 211 or pressure-bearing grooves 214 of the end insulating plates 21 of different battery packs 2. This design allows different battery packs 2 to be connected together through the same limiting member 3, improving the overall integrity. Moreover, the two battery packs 2 mutually restrict and limit each other, improving the positional stability of the battery packs 2.

[0043] In some embodiments, such as Figure 1As shown, the housing 1 is provided with a second beam 13, which is located in the sub-accommodating cavity where the battery pack 2 is located. The second beam 13 divides the sub-accommodating cavity where the battery pack 2 is located into multiple compartments. In this embodiment, the housing 1 is provided with two second beams 13, which divide the central sub-accommodating cavity where the battery pack 2 is located into three compartments, each compartment containing two sets of battery packs 2.

[0044] Specifically, at least two abutting sections 32 of the same limiting member 3 can respectively abut against the pressure-bearing protrusions 211 or pressure-bearing grooves 214 of the end insulating plates 21 of different battery packs 2 in the same compartment of the housing 1, for example... Figure 1 In the diagram, the two abutting sections 32 of the limiting member 3 (C) respectively abut against the pressure-bearing protrusions 211 of the end insulating plates 21 of the two battery packs 2 in the same compartment. In this case, the distance between adjacent abutting sections 32 of the limiting member 3 in the third direction can be smaller, such as... Figure 5 As shown, the specific range can be 10mm-30mm. For example, the specific values ​​can be 10mm, 15mm, 20mm, 25mm, and 30mm.

[0045] Specifically, at least two abutting sections 32 of the same limiting member 3 can also abut against the pressure-bearing protrusions 211 or pressure-bearing grooves 214 of the end insulating plates 21 of the battery packs 2 in different compartments within the housing 1, for example... Figure 1 In the diagram, the two abutting sections 32 of the limiting member 3 (as indicated by D) abut against the pressure-bearing protrusions 211 of the end insulating plates 21 of the two battery packs 2 in the two compartments, respectively. In this case, the distance between adjacent abutting sections 32 of the limiting member 3 in the third direction can be larger, such as... Figure 6 As shown, the specific range can be 30mm-70mm, and the specific values ​​can be 30mm, 40mm, 50mm, 60mm, and 70mm.

[0046] In some embodiments, such as Figure 2 and Figure 3As shown, the side of the pressing section 32 near the bottom plate and the side of the pressure-bearing protrusion 211 away from the bottom plate abut against each other. The side of the end insulating plate 21 near the first beam 12 is provided with multiple ribs 212. The multiple ribs 212 are arranged sequentially at intervals in the third direction. At least a portion of at least one rib 212 is located within the interval between adjacent pressing sections 32 of the same limiting member 3. The rib 212 enhances the overall strength of the end insulation plate 21, making it less prone to breakage and improving its insulation performance. At least a portion of the rib 212 is located within the interval between adjacent pressing sections 32 of the same limiting member 3. Thus, the portion of the rib 212 located between adjacent pressing sections 32 can abut against each other, thereby limiting the displacement of the battery pack 2 in the arrangement direction of the adjacent pressing sections 32. This allows the pressing sections 32 to not only limit the movement of the battery pack 2 in the height direction of the battery pack but also in the arrangement direction of the pressing sections 32, thus providing a multi-directional limiting effect.

[0047] In some embodiments, such as Figure 4 As shown, the side of the pressing section 32 near the bottom plate and the side of the pressure-bearing groove 214 near the bottom plate abut against each other. In the third direction, multiple first groove walls 214a of the same or different pressure-bearing grooves 214 are arranged sequentially at intervals, and at least a portion of at least one first groove wall 214a is located within the interval between adjacent pressing sections 32 of the same limiting member 3.

[0048] In some embodiments, such as Figure 2 As shown, the multiple ribs 212 extend along a first direction. A connecting protrusion 213 is provided on the side of the end insulating plate 21 near the first beam 12. Two or more adjacent ribs 212 are connected together at the ends away from the base plate via the same connecting protrusion 213, and at the ends near the base plate via the same connecting protrusion 213. This design enhances the strength of both the ends of the ribs 212 away from and near the base plate, preventing breakage at these ends from affecting the insulation performance of the end insulating plate 21.

[0049] In some embodiments, such as Figure 2 As shown, the fixing section 31 has at least two connecting holes 31a, and the fixing section 31 is fixed to the first beam 12 by threaded fasteners passing through the connecting holes 31a. The threaded fastener connection facilitates the disassembly and assembly of the limiting member 3, and the connection through at least two connecting holes 31a can prevent the limiting member 3 from rotating relative to the first beam 12.

[0050] In some embodiments, the limiting member 3 is a one-piece structure, specifically a one-piece sheet metal structure or a one-piece cast structure. The one-piece structure of the limiting member 3 has good integrity, is not prone to failure, and has low manufacturing cost.

[0051] In some embodiments, the fixing section 31 and the pressing section 32 of the limiting member 3 are smoothly transitioned by an arc-shaped transition section 33.

[0052] In some embodiments, the side of the battery pack 2 closest to the base plate is glued to the base plate. Specifically, the limiting member 3 can be installed before the glue between the battery pack 2 and the base plate has fully solidified. In this way, under the pressure of the limiting member 3, the glue between the battery pack 2 and the base plate can spread more evenly to various areas between the battery pack 2 and the base plate, which is more conducive to improving the adhesive stability between the battery pack 2 and the base plate.

[0053] The above embodiments can be freely combined without conflict.

[0054] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A battery pack, characterized in that, The battery pack includes a housing (1), a battery pack (2), and a limiting member (3). The housing (1) includes a bottom plate, a frame (11), and a first beam (12). The bottom plate and the frame (11) enclose a cavity. The first beam (12) is located in the cavity and divides the cavity into at least two sub-cavities. The battery pack (2) is located in the sub-cavities. The battery pack (2) includes a battery pack body and an end insulating plate (21). The battery pack body includes multiple stacked individual batteries (22). The end insulating plate (21) is provided at at least one end of the battery pack body. The limiting member (3) includes a fixing section (31) and a pressing section (32). The fixing section (31) is fixed to the first beam (12). The end insulating plate (21) has a pressure-bearing protrusion (211) on the side near the first beam (12). In the direction perpendicular to the bottom plate, the distance between the side of the pressure-bearing protrusion (211) away from the bottom plate and the bottom plate is less than the distance between the side of the end insulating plate (21) away from the bottom plate and the bottom plate. The pressing section (32) abuts against the side of the bottom plate near the bottom plate and the side of the pressure-bearing protrusion (211) away from the bottom plate. or, The end insulating plate (21) is provided with a pressure-bearing groove (214) inside. The pressure-bearing groove (214) has an opening on the side away from the bottom plate. At least part of the pressure-blocking section (32) extends into the pressure-bearing groove (214) through the opening. The side of the pressure-blocking section (32) near the bottom plate abuts against the side wall of the pressure-bearing groove (214) near the bottom plate.

2. The battery pack according to claim 1, characterized in that, The fixing section (31) is fixed to the side of the first beam (12) away from the base plate. The pressure section (32) bends from the side of the fixing section (31) near the battery pack (2) toward the base plate. In the direction perpendicular to the base plate, the distance between the side of the pressure-bearing protrusion (211) away from the base plate and the base plate is less than the distance between the side of the first beam (12) away from the base plate and the base plate.

3. The battery pack according to claim 1, characterized in that, The pressure-bearing protrusion (211) abuts against the first beam (12) on the side away from the battery pack body.

4. The battery pack according to claim 1, characterized in that, In the direction perpendicular to the base plate, the distance between the side of the end insulating plate (21) away from the base plate and the side of the end insulating plate (21) close to the base plate is L, and the distance between the side of the pressing section (32) close to the base plate and the side of the fixing section (31) close to the base plate is H, 0.05≤H / L≤0.

25.

5. The battery pack according to claim 1, characterized in that, In the arrangement direction of the individual cells (22), the distance between the side of the pressure-bearing protrusion (211) away from the battery pack body and the side of the pressure-bearing protrusion (211) close to the battery pack body is M, and the distance between the side of the pressure-bearing protrusion (211) away from the battery pack body and the side of the battery pack body close to the end insulating plate (21) is N, 0.5≤M / N≤0.

8.

6. The battery pack according to claim 1, characterized in that, The direction perpendicular to the base plate is defined as the first direction, the arrangement direction of each individual battery (22) is defined as the second direction, and the third direction is perpendicular to the first direction and the second direction. In the third direction, the length of the contact area between the pressure section (32) and the pressure-bearing protrusion (211) is A, and the length of the end insulating plate (21) is B, 0.02≤A / B≤0.

21.

7. The battery pack according to any one of claims 1-6, characterized in that, The direction perpendicular to the base plate is defined as the first direction, the arrangement direction of each individual battery (22) is defined as the second direction, and the third direction is perpendicular to the first direction and the second direction. The limiting member (3) includes a plurality of the pressing segments (32), and each pressing segment (32) is arranged sequentially at intervals in the third direction.

8. The battery pack according to claim 7, characterized in that, All the pressing sections (32) of the same limiting member (3) abut against the pressure-bearing protrusion (211) or the pressure-bearing groove (214) of the end insulating plate (21) of the same battery pack (2); or, At least two of the pressure-bearing sections (32) of the same limiting member (3) abut against the pressure-bearing protrusion (211) or the pressure-bearing groove (214) of the end insulating plate (21) of different battery packs (2).

9. The battery pack according to claim 7, characterized in that, The pressure-bearing section (32) abuts against the side of the base plate and the pressure-bearing protrusion (211) away from the base plate. The end insulating plate (21) is provided with multiple ribs (212) on the side near the first beam (12). The multiple ribs (212) are arranged sequentially at intervals in the third direction. At least a portion of at least one rib (212) is located within the interval between adjacent pressure-bearing sections (32) of the same limiting member (3); or, The side of the pressure-resistant section (32) near the bottom plate and the side of the pressure-bearing groove (214) near the bottom plate abut against each other. In the third direction, a plurality of first groove walls (214a) of the same or different pressure-bearing grooves (214) are arranged sequentially at intervals, and at least a portion of at least one first groove wall (214a) is located within the interval between adjacent pressure-resistant sections (32) of the same limiting member (3).

10. The battery pack according to claim 9, characterized in that, The plurality of ribs (212) extend along the first direction, and the end insulating plate (21) is provided with a connecting protrusion (213) on the side near the first beam (12). Two or more adjacent ribs (212) are connected together by the same connecting protrusion (213) at the ends away from the bottom plate and at the ends near the bottom plate.

11. The battery pack according to any one of claims 1-6, characterized in that, The fixing section (31) has at least two connecting holes (31a), and the fixing section (31) is fixed to the first beam (12) by threaded fasteners passing through the connecting holes (31a).

12. The battery pack according to any one of claims 1-6, characterized in that, The limiting component (3) is an integral structure.

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