Support and battery pack

Abstract

The utility model provides a support and a battery pack, the support comprises a substrate, one side of the substrate far away from battery cells is provided with a plurality of grooves, one side of the substrate close to the battery cells is provided with a plurality of bosses corresponding to the grooves, and the top of each boss is configured to support the corresponding battery cell. The boss is arranged on the base plate, so that a runner is formed between at least part of the bottom of the battery cell and the base plate, the runner is used for accommodating a connecting medium to fix the battery cell on the bracket, a first pressure relief groove is formed in the bottom of the boss, and the first pressure relief groove is suitable for being communicated with the battery cell to relieve pressure of the battery cell when the battery cell is in thermal runaway. The substrate provided by the utility model is not provided with a pressure relief hole, so that the sealing processing operation is not needed, and the assembling efficiency of the battery cell is further improved. Besides, the connecting medium can smoothly flow in a flow channel formed between the bottom of the battery cell and the substrate, and gradually covers until the connecting medium is uniformly distributed in the whole flow channel area, so that the connecting medium can be in full contact with the battery cell and the bracket, and the stability of battery cell fixation is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a support and battery package. BACKGROUND

[0002] In the related art, in order to ensure the safety of battery under abnormal condition, the battery cell is usually provided with an explosion-proof valve structure. In order to further protect the safety of the battery system, the support structure supporting the battery cell is usually provided with a pressure relief hole at the opposite position of the explosion-proof valve of the battery cell, so that when the internal gas pressure of the battery cell is too large, the explosion-proof valve structure is opened and the internal gas is released through the pressure relief hole, thereby reducing the risk of damage of the battery system due to excessive pressure. In addition, during the assembly of the battery cell, it is usually necessary to fix it by foaming glue. In order to avoid the foaming glue from entering the pressure relief hole and blocking it, a sealing operation is needed to isolate the foaming glue from the pressure relief hole. However, the sealing processing operation is relatively complicated and there is a risk of insufficient sealing after sealing processing. SUMMARY

[0003] The embodiments of the utility model provide a support and battery package, which solve the problem of complicated sealing processing operation and the risk of insufficient sealing after sealing processing in the related art.

[0004] In a first aspect, the embodiments of the utility model provide a support for mounting a plurality of battery cells, comprising: a substrate, the side of the substrate away from the battery cell is provided with a plurality of grooves, and the side of the substrate close to the battery cell is provided with a plurality of bosses corresponding to each groove, the top of each boss is configured to support the corresponding battery cell, so that at least part of the bottom of the battery cell and the substrate form a flow channel, the flow channel is used to accommodate a connecting medium to fix the battery cell to the support; wherein the bottom of the boss is provided with a first pressure relief groove, and the first pressure relief groove is suitable for communicating with the battery cell to release pressure of the battery cell when the battery cell is in thermal runaway.

[0005] In an embodiment, the bottom wall of the boss is provided with a first groove.

[0006] In an embodiment, the first groove has a first inner wall and a second inner wall connected thereto, and the first inner wall and the second inner wall are connected between the top wall and the inner side wall of the first pressure relief groove; wherein the included angle between the first inner wall and the second inner wall is an acute angle.

[0007] In an embodiment, the depth of the first groove is 0.3mm to 1.2mm.

[0008] In an embodiment, the width of the opening of the first groove is 0.6mm to 2.4mm.

[0009] In an embodiment, the substrate is suitable for being mounted on the bottom plate of the battery box body to form a second pressure relief groove with the bottom plate, and the second pressure relief groove communicates with the first pressure relief groove.

[0010] In an embodiment, the top wall of the first pressure relief groove is provided with a plurality of second grooves, the plurality of second grooves extend along the radial direction of the top wall and are arranged radially around the center of the top wall.

[0011] In an embodiment, the electrical core is projected on the plane where the top of the boss, and the edge of the top of the boss is exceeded.

[0012] In an embodiment, the wall thickness of the side wall of the boss is 1mm to 5mm, and / or the height of the boss is 1mm to 10mm, and / or the wall thickness of the top of the boss is 0.6mm to 1.5mm.

[0013] In a second aspect, the embodiments of the utility model provide a battery pack, the battery pack includes the electrical core group of the first aspect.

[0014] The utility model provides a kind of support and battery pack, wherein, support includes substrate, the side of substrate away from electrical core is equipped with a plurality of recesses, the side of substrate close to electrical core is equipped with a plurality of bosses corresponding to each recess, the top of each boss is configured to support corresponding electrical core, to form flow channel between at least part of the bottom of electrical core and substrate, flow channel is used to accommodate connecting medium, to fix electrical core on support, the bottom of boss is equipped with first pressure relief groove, first pressure relief groove is suitable for communicating electrical core to relieve pressure to electrical core when electrical core thermal runaway.The substrate provided by the utility model is not provided with pressure relief hole, so sealing processing operation is not needed, and then the assembly efficiency of electrical core is improved.In addition, connecting medium can flow smoothly in the flow channel formed between the bottom of electrical core and substrate, and gradually cover until evenly distributed in the entire flow channel area, so that connecting medium can be in full contact with electrical core and support, thereby improving the stability of electrical core fixation. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of these drawings.

[0016] Figure 1 It is the structural schematic diagram of support provided by the utility model embodiments;

[0017] Figure 2 It is the structural schematic diagram of support and electrical core provided by the utility model embodiments;

[0018] Figure 3 It is Figure 2 the top view of support and electrical core in it;

[0019] Figure 4 It is Figure 3is a sectional view of the battery pack in the A part of figure 1;

[0020] Figure 5 is Figure 4 is an enlarged view of the A part in figure 1;

[0021] Figure 6 is Figure 1 is a structural schematic view of the bracket in another view in figure 1;

[0022] Figure 7 is Figure 6 is an enlarged view of the B part in figure 1;

[0023] Figure 8 is Figure 5 is a partial structural schematic view of the bracket in figure 1;

[0024] Figure 9 is a structural schematic view of the battery pack provided by the embodiment of the present application;

[0025] Figure 10 is Figure 9 is a top view of the battery pack in figure 1;

[0026] Figure 11 is Figure 10 is a sectional view of the battery pack in figure 1;

[0027] Figure 12 is Figure 11 is an enlarged view of the C part in figure 1;

[0028] Explanation of reference signs:

[0029] 100, substrate; 110, boss; 120, first pressure relief groove; 130, first recess; 160, bottom plate; 170, second pressure relief groove; 180, second recess; 190, flow channel; 200, battery cell; 300, battery pack. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0031] In order to solve the problems of complicated sealing processing operation and the risk of insufficient sealing after sealing processing in the prior art, the embodiments of the utility model provide a support for installing multiple battery cells 200, please see Figures 1 to 5 , Figure 1 is the structural schematic diagram of the support provided by the embodiments of the utility model, Figure 2 is the structural schematic diagram of the support and the battery cell provided by the embodiments of the utility model, Figure 3 is Figure 2 the top view of the support and the battery cell in Figure 4 is Figure 3 the sectional view of Figure 5 is Figure 4 the enlarged view of A part in The support includes a substrate 100, the side of the substrate 100 away from the battery cell 200 is provided with multiple grooves, the side of the substrate 100 close to the battery cell 200 is provided with multiple bosses 110 corresponding to each groove, the top of each boss 110 is configured to support the bottom of the corresponding battery cell 200, and at least part of the bottom of the battery cell 200 and the substrate 100 form a flow channel 190, and the flow channel 190 is used to accommodate the connecting medium capable of fixing the battery cell 200 to the support. The bottom of the boss 110 is provided with a first pressure relief groove 120, which is configured to communicate with the inside of the battery cell 200 when the battery cell 200 is in a thermal runaway state, so as to discharge the gas in the battery cell 200 in time to realize the pressure relief function.

[0032] Specifically, the first pressure relief groove 120 is arranged at the bottom of the boss 110, when the battery cell 200 is in thermal runaway, the gas pressure in the battery cell 200 will rise rapidly, causing the explosion-proof valve at the bottom to open and release the gas. At this time, the strong impact force of the gas can break the top of the boss 110, so that the gas flows into the first pressure relief groove 120 at the bottom of the boss 110, thereby realizing the pressure relief function. Compared with the prior art, the substrate 100 provided by the embodiments of the utility model is not provided with a pressure relief hole, thereby avoiding the problem that the pressure relief hole may be blocked by the connecting medium, and also reducing the sealing processing and related process operations, thereby improving the assembly efficiency of the battery cell 200.

[0033] In addition, the connecting medium can flow smoothly in the flow channel 190 formed between the bottom of the battery cell 200 and the substrate 100, specifically, the connecting medium can fully fill the gap in the flow channel 190 during the flow process, and gradually cover until uniformly distributed in the entire flow channel area, so that the connecting medium can fully contact the battery cell 200 and the support, thereby improving the stability of the fixed battery cell 200.

[0034] In some embodiments, please see Figure 1 , Figure 6 and Figure 7 , Figure 6 is Figure 1A schematic view of the structure of the bracket from another perspective, Figure 7 is Figure 6 is an enlarged view of part B in FIG. 10, the bottom wall of the boss 110 is provided with a first groove 130. The design of the first groove 130 can effectively reduce the thickness of the top of the boss, thereby reducing the structural strength of this position to some extent, so that the gas released when the battery cell 200 is in thermal runaway can more easily break through the top of the boss. Thus, the gas discharged by the battery cell 200 can be released in time, avoiding the continued accumulation of internal pressure in the battery, greatly reducing the risk of safety accidents caused by thermal runaway of the battery cell 200.

[0035] Further, in order to ensure that the first groove 130 is more easily broken by the gas, in some embodiments, the first groove 130 is provided with a first inner wall and a second inner wall connected to each other, and the first inner wall and the second inner wall are connected between the top wall and the inner side wall of the first pressure relief groove 120; wherein the included angle between the first inner wall and the second inner wall is an acute angle.

[0036] Specifically, the included angle between the first inner wall and the second inner wall is an acute angle, so that when the gas released by the battery cell 200 exerts an impact force on the top of the boss 110, the stress can be concentrated at the position of the acute angle, thereby making the boss 110 more easily broken by the gas.

[0037] By setting the included angle between the first inner wall and the second inner wall to be an acute angle, the structural strength of the top of the boss 110 when the gas impacts the boss 110 can be significantly reduced. Specifically, the acute angle design can cause the stress of the top of the boss 110 when the gas impacts the boss 110 to be concentrated at the position of the acute angle. This stress concentration phenomenon can accelerate the deformation and rupture of the top of the boss, thereby making the boss 110 structure more easily broken by the gas, ensuring that the gas can be released more quickly in the case of thermal runaway of the battery cell 200, reducing the excessive accumulation of internal pressure in the battery, and greatly ensuring the safety of the battery cell 200.

[0038] In some embodiments, reference can be made to Figure 8 , Figure 8 is Figure 5 is a schematic view of part of the structure of the bracket, the depth H1 of the first groove 130 is designed to be in the range of 0.3mm to 1.2mm.

[0039] Specifically, it has been experimentally verified that, on the one hand, if the depth H1 of the first groove 130 is less than 0.3 mm, the structural strength of the top of the boss cannot be effectively weakened due to insufficient depth H1 of the first groove 130, resulting in that when the battery cell 200 is in a thermal runaway state, the stress cannot be sufficiently concentrated when the gas impacts the top of the boss, and the top of the boss cannot be quickly broken through, thereby failing to achieve the expected effect of accelerating the discharge of the gas in the battery cell 200 to the first pressure relief groove 120. In this case, the accumulation of gas and the increase of pressure may cause the battery to over-expand or rupture, greatly increasing the safety risk when the battery is in thermal runaway.

[0040] On the other hand, if the depth H1 of the first groove 130 is greater than 1.2 mm, although the further increase of the depth H1 of the first groove 130 makes the top of the boss 110 more likely to be broken when impacted by the gas, this design also brings practical production problems. Due to the excessive depth H1 of the first groove 130, it causes difficulties in the mold injection process, especially during the injection process, the excessive depth H1 of the first groove 130 increases the molding difficulty, resulting in that the first groove 130 cannot be smoothly formed. In addition, the first groove 130 with excessive depth H1 may cause the structural strength of the top of the boss 110 to decrease significantly, which may further cause the boss 110 to be unable to bear the weight of the battery cell 200 when supporting the battery cell 200, resulting in damage to the structure of the boss 110.

[0041] Therefore, by limiting the depth H1 of the first groove 130 to be within the range of 0.3 mm to 1.2 mm, the adverse effects of excessively shallow or excessively deep design can be effectively avoided, while ensuring the structural strength of the battery, efficiently and reliably accelerating the gas release process, avoiding excessive internal pressure accumulation, ensuring the safe pressure relief of the battery in the case of thermal runaway, and reducing the potential safety hazards.

[0042] In some embodiments, referring to Figure 8 , the opening width d of the first groove 130 is designed to be within the range of 0.6 mm to 2.4 mm.

[0043] Specifically, it has been experimentally verified that, on the one hand, if the opening width d of the first groove 130 is less than 0.6 mm, the boss 110 is difficult to be injection molded. In addition, the small opening of the groove cannot effectively weaken the structural strength of the top of the boss, as the main purpose of the design of the first groove 130 is to optimize the stress distribution of the battery structure, the small opening may cause the structural strength to be insufficiently reduced, which cannot achieve the expected pressure relief effect, thereby affecting the safety and performance of the battery.

[0044] On the other hand, if the opening width d of the first groove 130 is greater than 2.4 mm, it may adversely affect the structural strength of the boss top. An excessively wide opening will weaken the support structure of the boss top, reducing the overall strength of the boss 110. Specifically, an excessively wide opening will result in a reduction in the material area that can provide support, thereby reducing the strength and stability of the boss 110 when subjected to external pressure. In practical applications, the boss 110 needs to withstand the weight of the battery cell 200 and external pressure, and if its support structure is too weak, it may not be able to effectively support the weight of the battery cell 200, causing the boss 110 to deform or be damaged. This design flaw can make the battery structure less secure, and in severe cases, it can cause the battery to malfunction during operation, increasing the safety hazard.

[0045] Therefore, designing the opening width d of the first groove 130 in the range of 0.6 mm to 2.4 mm can effectively avoid the adverse effects of an excessively narrow or wide opening. This structural design not only makes it easier to injection mold the boss 110, but also effectively optimizes the battery cell 200 exhaust efficiency while ensuring structural strength and safety.

[0046] In some embodiments, please refer to Figures 9 to 12 , Figure 9 is a structural diagram of a battery pack provided by the embodiments of the present application, Figure 10 is Figure 9 a top view of the battery pack in Figure 11 is Figure 10 a sectional view of the battery pack in Figure 12 is Figure 11 an enlarged view of part C in The base plate 100 can cooperate with the bottom plate 160 of the battery box to jointly form a second pressure relief groove 170, and the second pressure relief groove 170 is designed to be in communication with the first pressure relief groove 120. When the battery cell 200 experiences thermal runaway, the gas released by the battery cell 200 will first enter the first pressure relief groove 120, and then the gas will flow to the second pressure relief groove 170 in communication with the first pressure relief groove 120. The second pressure relief groove 170 can cooperate with other structures to guide the gas in the second pressure relief groove 170 to a designated location for collection or discharge, avoiding the accumulation of gas inside the battery box, preventing excessive internal pressure or other safety hazards.

[0047] For example, further optimization design can include the connection of the second pressure relief groove 170 with the vent hole or ventilation duct of the external environment of the battery box, forming an effective gas ventilation system. Through this design, the gas can be quickly discharged in the event of thermal runaway, reducing the increase in internal pressure of the battery box, thereby improving the safety and reliability of the battery system.

[0048] In this embodiment, the first pressure relief groove 120 and the second pressure relief groove 170 cooperate with each other to ensure the smoothness of the gas discharge path and effectively reduce the risk of gas accumulation in the battery box, thereby ensuring the safety and reliability of the battery system.

[0049] In some embodiments, referring to Figure 2 , Figure 7 The top wall of the first pressure relief groove 120 is provided with a plurality of second grooves 180, and the second grooves 180 extend along the radial direction of the top wall and are arranged radially around the center of the top wall.

[0050] Specifically, the plurality of second grooves 180 are arranged to further reduce the structural strength of the top of the boss. The second grooves 180 weaken the structural strength of the top of the boss by reducing the thickness of the top of the boss, and the second grooves 180 can also cooperate with the first grooves 130 described above to further weaken the structural strength of the top of the boss. The plurality of second grooves 180 are arranged radially around the center of the top wall, which can effectively optimize the structural strength of the battery box. When the battery cell 200 is in a normal working state, the distribution of the second grooves 180 helps to evenly distribute the pressure exerted by the battery cell 200 on the boss 110, avoiding the occurrence of local stress concentration, thereby ensuring the stability of the boss 110, so that the boss 110 can meet the required structural strength requirement without thermal runaway.

[0051] In some embodiments, referring to Figure 5 The orthographic projection of the battery cell 200 on the plane where the top of the boss 110 is located exceeds the edge of the top of the boss 110. This design expands the effective contact area of the battery cell 200 beyond the edge of the boss 110, ensuring a larger contact area between the battery cell 200 and the bracket, so that the connecting medium in the flow channel 190 formed between the bottom of the battery cell 200 and the substrate 100 has a larger contact area with the bottom of the battery cell 200, thereby making the connection between the battery cell 200 and the bracket more secure, effectively preventing the battery cell 200 from shifting or loosening due to factors such as vibration and external force during use, and ensuring the stability and reliability of the battery system.

[0052] From a structural point of view, this design not only enhances the fixing effect between the battery cell 200 and the bracket, but also improves the overall strength and pressure resistance of the battery system by optimizing the structural layout. When the battery box is under stress, the increased contact area can evenly distribute external forces and avoid excessive local stress, reducing deformation or damage caused by stress concentration. Therefore, the structural design of the present embodiment effectively improves the overall fixing effect between the battery cell 200 and the bracket, ensuring that the battery system can operate stably under different working conditions and reducing safety hazards.

[0053] In some embodiments, the wall thickness of the side wall of the boss 110 is 1mm to 5mm, and / or the height of the boss 110 is 1mm to 10mm, and / or the wall thickness of the top of the boss 110 is 0.6mm to 1.5mm.

[0054] Firstly, it has been verified through experiments that when the wall thickness of the side wall of the boss 110 is less than 1mm, the material flowability will be insufficient due to the excessively thin wall thickness, which will make the injection molding process of the boss 110 more difficult. When the wall thickness of the side wall of the boss 110 is greater than 5mm, the excessively thick wall thickness will cause uneven cooling of the plastic during injection molding, resulting in excessive resistance to plastic flow, too long cooling time, and possible problems such as bubbles, uneven shrinkage or deformation.

[0055] Therefore, the wall thickness of the side wall of the boss 110 is controlled to be between 1mm and 5mm in this embodiment, which can balance the difficulty of injection molding and the quality of the finished product. Within this wall thickness range, the injection molding process is relatively simple, which can ensure that the plastic material can flow smoothly into the mold and fill all areas, avoiding problems such as poor flow or uneven cooling, while also ensuring that the finished product has sufficient strength and stability.

[0056] Secondly, when the height of the boss 110 is less than 1mm, the flowability of the flow channel 190 formed between the bottom of the battery cell 200 and the substrate 100 will be significantly affected, which will cause the connecting medium to flow smoothly and evenly, resulting in poor fixing effect of the battery cell 200 on the support. On the other hand, when the height of the boss 110 is greater than 10mm, the occupied space of the support will be significantly increased. This not only increases the volume of the support itself, but also may cause the volume efficiency of the overall design to be reduced, affecting the compactness and integrability of the equipment. Therefore, the height of the boss 110 is designed to be between 1mm and 10mm to ensure the flowability of the connecting medium to be smooth and the fixing effect between the battery cell 200 and the support to be optimized, while avoiding unnecessary impact on space and weight caused by excessively high boss 110.

[0057] When the wall thickness of the top of the boss is less than 0.6mm, the injection molding process will become more difficult. When the wall thickness of the top of the boss is greater than 1.5mm, it will be difficult for the gas to break through the top of the boss due to the excessively thick wall thickness, which will not release the gas in time, which is not conducive to the safety and reliability of the battery.

[0058] Therefore, the wall thickness of the top of the boss needs to be reasonably designed between 0.6mm and 1.5mm, which can not only ensure the smooth progress of injection molding and avoid the molding difficulties caused by excessively thin wall thickness, but also avoid the gas release problems caused by excessively thick wall thickness, thereby ensuring the safety of the battery cell 200.

[0059] The utility model provides a kind of support, support includes substrate 100 and multiple bosses 110, boss 110 is set to substrate 100, the top of each boss 110 is configured as support corresponding battery cell 200, to form flow channel 190 between the bottom of battery cell 200 and substrate 100, flow channel 190 is used to accommodate connecting medium, to fix battery cell 200 on support, the bottom of boss 110 is equipped with first pressure relief groove 120, first pressure relief groove 120 is suitable for when battery cell 200 thermal runaway intercommunication battery cell 200 to relieve pressure to battery cell 200.Compared with relevant technology, the substrate 100 provided by the utility model is not set pressure relief hole, so it is not necessary to carry out sealing processing and its relevant process operation, and then the assembly efficiency of battery cell 200 is improved.In addition, connecting medium can flow smoothly in flow channel 190 formed between the bottom of battery cell 200 and substrate 100, and gradually cover until evenly distributed in entire flow channel 190 area, so that connecting medium can be in full contact with battery cell 200, support, so as to improve the stability of the fixed battery cell 200.

[0060] The utility model further provides a kind of battery pack 300, battery pack 300 includes the support described above, and have the all advantages of the support described above, not repeat here.

[0061] The above detailed introduction is carried out to the embodiment of the utility model, the principle and implementation mode of the utility model are described in this paper by applying specific example, the above embodiment is only used to help understand the method of the utility model and its core idea;Meanwhile, for the person skilled in the art, according to the idea of the utility model, there will be changes in specific implementation mode and application range, and the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A bracket for mounting multiple battery cells, characterized in that, include: The substrate has a plurality of grooves on the side away from the battery cell and a plurality of protrusions corresponding to each groove on the side of the substrate close to the battery cell. The top of each protrusion is configured to support the corresponding battery cell so that at least a portion of the bottom of the battery cell forms a flow channel between the battery cell and the substrate. The flow channel is used to accommodate a connecting medium to fix the battery cell to the bracket. The bottom of the boss is provided with a first pressure relief groove, which is adapted to connect to the battery cell to relieve pressure when the battery cell experiences thermal runaway.

2. The bracket according to claim 1, characterized in that, The bottom wall of the boss is provided with a first groove.

3. The bracket according to claim 2, characterized in that, The first groove has a first inner wall and a second inner wall connected together, the first inner wall and the second inner wall being connected between the top wall and the inner side wall of the first pressure relief groove; wherein, the included angle between the first inner wall and the second inner wall is an acute angle.

4. The bracket according to claim 2, characterized in that, The depth of the first groove is 0.3 mm to 1.2 mm.

5. The bracket according to claim 2, characterized in that, The width of the opening of the first groove is 0.6 mm to 2.4 mm.

6. The stent according to any one of claims 1-5, characterized in that, The substrate is adapted to be mounted on the bottom plate of the battery box to form a second pressure relief groove with the bottom plate, and the second pressure relief groove is connected to the first pressure relief groove.

7. The stent according to any one of claims 1-5, characterized in that, The top wall of the first pressure relief groove is provided with a plurality of second grooves, which extend radially along the top wall and are arranged radially around the center of the top wall.

8. The stent according to any one of claims 1-5, characterized in that, The orthographic projection of the battery cell onto the plane containing the top of the boss extends beyond the edge of the top of the boss.

9. The stent according to any one of claims 1-5, characterized in that, The sidewall thickness of the boss is 1 mm to 5 mm, and / or the height of the boss is 1 mm to 10 mm, and / or the top wall thickness of the boss is 0.6 mm to 1.5 mm.

10. A battery pack, characterized in that, It includes at least one battery cell and the bracket as described in any one of claims 1-9.

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