Battery cell cover plate, battery cell, and battery pack

Abstract

The application relates to the technical field of batteries, and provides a battery cell cover plate, a battery cell and a battery pack. The battery cell cover plate comprises a cover plate body, a base plate and a boss, the boss is connected to the plate surface of the base plate and protrudes from the plate surface along the thickness direction of the base plate, the side of the boss away from the plate surface is provided with a supporting surface, and the supporting surface is provided with a blind hole; the supporting surface is used for supporting connection with the box body of the battery pack, and the two are adapted to be provided with insulating heat-conducting glue therebetween, and the blind hole is used for filling the insulating heat-conducting glue; and a pole is arranged through the base plate and protrudes from the plate surface. The battery cell cover plate can be used for supporting connection with the box body of the battery pack through the boss, the distance between the bus bar and the box body is reduced, the space utilization of the battery pack is improved, and the heat dissipation efficiency of the battery cell is improved. Meanwhile, the connection strength of the boss and the box body can be increased, the boss and the box body are prevented from being delaminated, and the boss and the box body are ensured to be in the connected state.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cell cover, a cell, and a battery pack. Background Technology

[0002] The battery pack includes a casing and battery modules assembled inside the casing. Each battery module consists of multiple cells, with the terminals of these cells electrically connected via busbars. The casing provides physical support for the battery modules, protecting them from external impacts and pressure, while also preventing the intrusion of moisture, dust, and other impurities. As users' demands for longer battery life continue to increase, current battery technology faces a contradiction: battery capacity development lags behind market demand, leading to user range anxiety.

[0003] In traditional battery pack structures, to prevent the busbars and terminals from being squeezed and damaged when the casing deforms under external impact, a large space is left between the busbars and the battery pack casing. However, this results in low utilization of the internal space of the battery pack, which is not conducive to increasing the battery capacity. Summary of the Invention

[0004] This invention provides a cell cover, a cell, and a battery pack to solve the problem of low internal space utilization in existing battery packs.

[0005] This invention provides a battery cell cover plate, comprising:

[0006] The cover plate body includes a base plate and a boss. The boss is connected to the surface of the base plate and protrudes from the surface of the base plate along the thickness direction of the base plate. The side of the boss away from the surface of the base plate has a support surface, and the support surface is provided with a blind hole. The support surface is used to support and connect with the casing of the battery pack, and insulating thermally conductive adhesive is suitable to be provided between the two. The blind hole is used to fill the insulating thermally conductive adhesive.

[0007] The pole is inserted through the substrate and protrudes from the surface of the plate.

[0008] According to a battery cell cover plate provided by the present invention, in the thickness direction, the cross-sectional dimension of the blind hole gradually decreases from the supporting surface towards the plate surface.

[0009] A cell cover plate provided by the present invention further includes:

[0010] A protective patch includes a substrate and a covering portion. The substrate is attached to the surface of the plate, and the covering portion is connected to the substrate and covers the boss. The portion of the covering portion corresponding to the support surface has a first opening, and the blind hole is located within the range of the first opening.

[0011] A cell cover plate provided by the present invention further includes:

[0012] An explosion-proof valve is disposed on the substrate. The pole, the explosion-proof valve and the boss are arranged at intervals along the length of the substrate, and the boss is provided between the pole and the explosion-proof valve.

[0013] According to a battery cell cover plate provided by the present invention, the cover plate body has a groove formed on the side away from the boss in the thickness direction corresponding to the position of the boss.

[0014] A cell cover plate provided by the present invention further includes:

[0015] An insulating member is connected to the side of the substrate away from the boss in the thickness direction. The side of the insulating member near the cover plate body has a protrusion, which is located in the groove. A recess is formed on the side of the insulating member away from the substrate corresponding to the position of the protrusion for accommodating the electrode tabs of the electrode assembly. The electrode post passes through the insulating member.

[0016] According to the present invention, a battery cell cover plate is provided, wherein there are multiple blind holes, and the multiple blind holes are distributed in a matrix.

[0017] According to the present invention, a battery cell cover plate includes a first protrusion and a second protrusion. The first protrusion is connected to the plate surface, and the second protrusion protrudes from the first protrusion on the side away from the substrate in the thickness direction. The support surface is formed on the side of the second protrusion away from the substrate in the thickness direction.

[0018] The present invention also provides a battery cell, comprising: a battery cell housing, an electrode assembly, and any one of the above-mentioned battery cell cover plates;

[0019] The cell housing has an opening, the cell cover plate is disposed in the opening and surrounds the cell housing to form a receiving cavity, the electrode group is disposed in the receiving cavity, and the electrode tabs of the electrode group are connected to the electrode post.

[0020] The present invention also provides a battery pack, comprising:

[0021] The housing has a first plate portion and a second plate portion that are arranged opposite to each other;

[0022] Multiple battery cells of any of the above types are disposed in the housing, the boss is supported and connected to the first plate, the end of the battery cell away from the battery cell cover is supported and connected to the second plate, and the supporting surface is connected to the first plate through the insulating thermally conductive adhesive.

[0023] The present invention provides a cell cover, a cell, and a battery pack. By providing a boss on the cover body, the boss is connected to the housing for support, allowing the cell's outer shell to also serve as a supporting component. Under the support of the outer shell, significant deformation of the housing can be avoided, thereby reducing the housing thickness and the weight of the battery pack. Furthermore, while ensuring that the housing does not cause compression damage to the busbars and terminals, the distance between the busbars and the housing can be reduced, thereby increasing the volume of the cell. This fully utilizes the internal space of the housing, increasing the cell's capacity and the overall energy density of the battery pack. Moreover, the connection between the boss and the housing allows heat from the cell to be transferred to the housing through the boss, improving the cell's heat dissipation efficiency. Simultaneously, blind holes for filling adhesive on the supporting surface increase the connection strength between the boss and the housing, preventing delamination and ensuring that the boss and housing remain connected, thus guaranteeing that heat from the cell can be transferred to the housing through the boss. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention 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 invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is one of the structural schematic diagrams of the battery cell cover plate provided by the present invention.

[0026] Figure 2 This is one of the cross-sectional views of the battery cell cover plate provided by the present invention.

[0027] Figure 3 This is the second cross-sectional view of the battery cell cover plate provided by the present invention.

[0028] Figure 4 This is the third cross-sectional view of the battery cell cover plate provided by the present invention.

[0029] Figure 5 This is the fourth cross-sectional view of the battery cell cover plate provided by the present invention.

[0030] Figure 6 This is the fifth cross-sectional view of the battery cell cover plate provided by the present invention.

[0031] Figure 7 This is the second schematic diagram of the structure of the battery cell cover plate provided by the present invention.

[0032] Figure 8 yes Figure 7 An exploded diagram of the battery cell cover plate.

[0033] Figure 9 This is a schematic diagram of the battery cell provided by the present invention.

[0034] Figure 10 This is a partial structural schematic diagram of the battery pack provided by the present invention.

[0035] Figure 11 This is a schematic diagram of the internal structure of the battery pack provided by the present invention.

[0036] Figure 12 This is one of the cross-sectional views of the battery pack provided by the present invention.

[0037] Figure 13 yes Figure 12 A magnified view of a portion of the image.

[0038] Figure 14 This is a second cross-sectional view of the battery pack provided by the present invention.

[0039] Figure 15 yes Figure 14 A magnified view of a portion of the image.

[0040] Figure label:

[0041] 1. Battery cell; 100. Battery cell cover plate; 11. Cover plate body; 111. Substrate; 112. Boss; 1121. Support surface; 11211. Blind hole; 1120. Protrusion; 1120a. First protrusion; 1120b. Second protrusion; 1122. Injection hole; 1123. Stepped surface; 12. Terminal post; 13. Explosion-proof valve; 14. Insulating component; 141. Protrusion; 1411. Top wall; 1412. Annular side wall; 142. Settling tank; 142 1. Hole; 143. Receiving groove; 144. Partition; 15. Protective patch; 150. First window; 151. Substrate; 152. Covering part; 1522. First protrusion; 1523. First covering part; 1524. Second covering part; 16. Plastic bracket; 160. Second window; 161. Second protrusion; 162. Covering part; 17. Connecting piece; 171. First contact part; 172. Second contact part; 173. Connecting part; 18. Insulating and heat-conducting component; 200. Cell housing; 300. Electrode group; 31. Electrode tab; 400. Insulating and heat-conducting adhesive; 51. Busbar; 52. Data acquisition circuit board; 61. First board part; 62. Second board part; 700. Exhaust channel; X, length direction of substrate; Y, width direction of substrate; Z, thickness direction of substrate. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly identifying product components and do not represent any substantial difference. The terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances. Furthermore, "multiple" means two or more. In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0044] The following is combined with Figures 1-15 The present invention describes a cell cover, a cell, and a battery pack.

[0045] like Figure 1 As shown, this embodiment of the invention provides a battery cell cover 100, which includes a cover body 11 and a terminal post 12. The cover body 11 includes a substrate 111 and a boss 112. The boss 112 is connected to the surface of the substrate 111 and protrudes from the surface of the substrate 111 along the thickness direction of the substrate 111. The side of the boss 112 away from the substrate 111 has a support surface 1121, and the support surface 1121 has a blind hole 11211. The support surface 1121 is used for supporting connection with the battery pack housing, and insulating thermally conductive adhesive 400 is suitable for being disposed between the two. The blind hole 11211 is used to fill the insulating thermally conductive adhesive 400. It can be understood that the protrusion direction of the boss 112 and the terminal post 12 is consistent with the thickness direction of the substrate 111.

[0046] The cell cover 100 is applied to the cell, which includes a cell housing 200, an electrode assembly 300, and the cell cover 100. The cell housing 200 has an opening, and the cell cover 100 is disposed at the opening and surrounds the cell housing 200 to form a receiving cavity. The electrode assembly 300 is disposed within the receiving cavity. The cover body 11 and the cell housing 200 are typically made of metal. The cell housing 200 and the cover body 11 constitute the outer shell of the cell, providing protection for the internal components and withstanding certain external impacts. When the cell is assembled into the battery pack housing, the boss 112 can be supported and connected to the top cover or cold plate of the housing. One end of the terminal post 12 protrudes from the surface of the substrate 111 to form a terminal post terminal for connection to the busbar 51, and the other end is located within the receiving cavity and connected to the tab 31 of the electrode assembly 300 via a connecting piece 17.

[0047] The substrate 111 includes a first plate surface and a second plate surface opposite to each other in its thickness direction. The first plate surface faces the outside of the battery cell, and the second plate surface faces the electrode assembly 300 inside the receiving cavity. A boss 112 protrudes from the first plate surface, and its supporting surface 1121 away from the first plate surface is used for supporting connection with the battery pack housing. The portion of the housing that is supported and connected to the boss 112 can be the housing shell; or, the housing includes a shell and a cold plate, with the cold plate located between the shell and the battery cell, and the boss 112 supported and connected to the cold plate.

[0048] Optionally, in the thickness direction of the substrate 111, the height of the electrode post 12 relative to the first plate surface is less than the height of the boss 112 relative to the first plate surface. Thus, when the side of the housing facing the battery cell electrode post terminal is flat, while ensuring the support connection between the boss 112 and the housing, there is still space between the electrode post 12 and the housing that can be used to install the busbar 51.

[0049] In this embodiment of the invention, the supporting surface 1121 of the boss 112 is used to connect with the housing via an insulating thermally conductive adhesive 400, such as epoxy resin, silicone rubber, or polyurethane thermally conductive structural adhesive. To ensure good adhesion strength while transferring heat, polyurethane thermally conductive structural adhesive is preferred, having a thermal conductivity greater than 1.0 W / (m·K) and a melting point not lower than 100℃. Optionally, the surface of the boss 112 is also coated with an insulating coating.

[0050] When assembling the battery pack, adhesive can be applied to the support surface 1121 of the boss 112 first, and then the top cover or cold plate can be bonded to the boss 112. During adhesive application, a portion of the adhesive can be filled into the blind holes 11211 on the support surface 1121 to increase the contact area between the support surface 1121 and the adhesive. After assembly and adhesive curing, the boss 112 and the casing have strong adhesive strength, preventing them from delaminating and thus maintaining heat transfer between the boss 112 and the casing, ensuring that the heat from the battery cells can be effectively transferred to the casing through the boss 112.

[0051] In traditional battery pack structures, the battery pack relies solely on the casing to withstand external impacts. However, the casing plate opposite the terminal 12 has a large area, and if its rigidity is insufficient, it is prone to deformation. To prevent casing deformation from causing crush damage to the busbar 51 and terminal 12, a large space needs to be reserved between the busbar 51 and the casing in the structural design; some designs also incorporate concave and convex structures on the casing plate to enhance its rigidity and prevent deformation. These measures result in a large gap between the cells and the casing, leading to wasted space. Increasing the casing thickness to increase rigidity would increase the weight of the battery pack, hindering lightweight design. Furthermore, the cells rely solely on heat exchange between the busbar 51 and the terminal terminals and the air for heat dissipation, which is slow and prone to heat accumulation, resulting in a high temperature rise in the battery pack and affecting its performance.

[0052] The cell cover 100 provided in this embodiment of the invention features a protrusion 112 on the cover body 11, which is connected to the housing for support, allowing the cell's outer shell to also function as a load-bearing component. This support prevents significant deformation of the housing, reducing its thickness and the weight of the battery pack. Furthermore, while ensuring the housing does not cause compression damage to the busbar 51 and terminal post 12, the distance between the busbar 51 and the housing can be reduced, increasing the cell's volume and fully utilizing the internal space of the housing to improve cell capacity and the overall energy density of the battery pack. Additionally, the protrusion 112's connection to the housing allows heat from the cell to be transferred to the housing, improving the cell's heat dissipation efficiency. Meanwhile, the blind hole 11211 for filling adhesive provided on the support surface 1121 can increase the connection strength between the boss 112 and the housing, prevent the boss 112 from delaminating from the housing, and ensure that the boss 112 and the housing remain connected, thereby ensuring that the heat of the battery cell can be transferred to the housing through the boss 112.

[0053] In this embodiment of the invention, the boss 112 and the substrate 111 are integrally formed. Alternatively, the boss 112 is welded and fixed to the substrate 111 as an independent structural component.

[0054] In this embodiment of the invention, the boss 112 can be a solid boss 112. Alternatively, the boss 112 can have an internal hollow structure, that is, the side of the boss 112 facing the substrate 111 forms a recess, which can reduce the weight of the cover plate body 11, thereby reducing the weight of the battery cell and battery pack.

[0055] When the boss 112 has an internally hollow structure, optionally, a through hole is provided on the substrate 111 at the position corresponding to the boss 112, so that a groove is formed on the side of the cover plate body 11 away from the boss 112 in the thickness direction of the substrate 111 at the position corresponding to the boss 112. See [reference needed] Figure 2The groove can be used to accommodate the tabs 31 of the electrode assembly 300, which helps to increase the space utilization within the cell housing 200, thereby increasing the cell capacity. Of course, if it is not necessary to accommodate the tabs 31, the through holes can be omitted on the substrate 111 at the position corresponding to the boss 112, which helps to improve the structural strength of the substrate 111 at the position of the boss 112.

[0056] Optionally, the boss 112 is formed by stamping from a sheet metal. For example, the boss 112 can be stamped from a separate sheet metal and then welded to the substrate 111. Alternatively, the boss 112 and the substrate 111 can be stamped together integrally. This allows a groove to be formed on the side of the cover body 11 away from the boss 112 to accommodate the tab 31, and also simplifies the manufacturing process of the cover body 11. When the boss 112 is formed by stamping from a sheet metal, the boss 112 with multiple protrusions 1120 can be formed by multiple stamping processes, which can reduce the height of a single stamping, avoid sheet metal breakage, and ensure the structural strength of the boss 112.

[0057] The battery cell has two terminals 12, namely a positive terminal and a negative terminal. In this embodiment of the invention, the number of terminals 12 on the battery cell cover plate 100 can be one (positive terminal or negative terminal) or two (positive terminal and negative terminal). The number of protrusions 112 on the cover plate body 11 can be one or more, specifically determined according to the size of the substrate 111 and the volume and load-bearing capacity of the protrusions 112. When there are multiple protrusions 112, the substrate 111 is provided with multiple protrusions 112 arranged along its length direction; and / or, the substrate 111 is provided with multiple protrusions 112 arranged along its width direction. The sizes of the multiple protrusions 112 can be the same or different.

[0058] Optionally, such as Figure 3 As shown, in the thickness direction of the substrate 111, the cross-sectional dimensions of the blind hole 11211 gradually decrease from the supporting surface 1121 towards the surface of the substrate 111. In this way, the hole wall of the blind hole 11211 can limit the adhesive located inside it, improve the bonding strength between the substrate 111 and the adhesive, and thus help ensure the reliability of the boss 112 and the housing.

[0059] In this embodiment of the invention, there are multiple blind holes 11211, and these multiple blind holes 11211 are distributed in a matrix. For example... Figure 1 As shown, the support surface 1121 has two rows of blind holes 11211, with eight blind holes in each row. This increases the contact area between the boss 112 and the adhesive over a larger area, thus improving the reliability of the connection between the boss 112 and the housing. The specific number and arrangement of the blind holes 11211 can be adaptively adjusted according to the area and shape of the support surface 1121.

[0060] like Figure 3As shown, the battery cell cover 100 provided in this embodiment of the invention further includes a protective patch 15, which includes a substrate 151 and a covering portion 152. The substrate 151 is attached to the surface of the substrate 111, and the covering portion 152 is connected to the substrate 151 and covers the boss 112. The covering portion 152 has a first opening 150 corresponding to the support surface 1121, and a blind hole 11211 is located within the range of the first opening 150. The protective patch 15 is used for structural protection of the cover body 11 and to prevent the cover body 11 from contacting external conductive components and causing a short circuit.

[0061] The substrate 151 and the covering portion 152 are integrally formed. The substrate 151 is attached to the first surface of the substrate 111, and the covering portion 152 covers the boss 112. The first opening 150 is located in the area of ​​the supporting surface 1121 and surrounds one or more blind holes 11211. The protective patch 15 is attached to the surface of the cover plate body 11. Because it has a certain thickness, it can form a sol-gel groove on the supporting surface 1121, which can be used to contain a certain amount of glue to reduce or avoid glue overflow when the boss 112 is bonded to the housing, thereby improving the bonding strength between the boss 112 and the housing.

[0062] Since the boss 112 is a metal part, when the boss 112 is close to the pole 12, there is a risk of creepage and arcing. The protective patch 15 is made of insulating material and covers the boss 112, which can form an insulating barrier between the boss 112 and the pole 12, thereby reducing or avoiding the risk of creepage and arcing.

[0063] Furthermore, such as Figure 4 and Figure 5 As shown, the covering portion 152 has a first protrusion 1522 on the side away from the supporting surface 1121. The first protrusion 1522 protrudes in a direction away from the supporting surface 1121 and is arranged in a ring around the first opening 150. The first protrusion 1522 and the supporting surface 1121 form a first adhesive groove.

[0064] Specifically, the covering portion 152 has a first protrusion 1522 corresponding to the portion of the supporting surface 1121. The adhesive used to bond the supporting surface 1121 and the housing can be partially contained in the first adhesive reservoir. The first protrusion 1522 can be formed by extrusion molding, by melting the material on the surface of the covering portion 152, or by depositing material to increase the thickness; this embodiment is not limited to any particular method.

[0065] When applying the adhesive, the adhesive is placed in the first adhesive container. The first protrusion 1522 can prevent the adhesive from overflowing, reduce the spread of the adhesive beyond the support surface 1121 under the squeezing action of the housing, and ensure the thickness of the adhesive layer between the protrusion 112 and the housing. This helps to improve the uniformity of the adhesive layer thickness between multiple battery cells and the housing, thereby ensuring that multiple battery cells are reliably connected to the housing.

[0066] Since the boss 112 is a metal part, when the distance between the boss 112 and the pole post 12 is close, there is a risk of creepage and arcing. The protective patch 15 is made of insulating material, and its covering part 152 covers the boss 112, which can isolate the pole post 12 and the boss 112 and prevent creepage and arcing caused by the pole post 12 and the boss 112 being too close.

[0067] In some embodiments of the present invention, the first protrusion 1522 may be a solid block structure or an internally hollow structure protruding from the covering portion 152.

[0068] When the first protrusion 1522 has an internally hollow structure, optionally, the side of the covering portion 152 facing the support surface 1121 forms a recess corresponding to the position of the first protrusion 1522, see [reference]. Figure 4 Specifically, the portion of the covering 152 corresponding to the support surface 1121 has an inner surface facing the support surface 1121 and an outer surface away from the support surface 1121. The outer surface forms a bulge at the location of the first protrusion 1522, and the inner surface forms a recess at the location of the first protrusion 1522. The first protrusion 1522 can be formed by stamping or hot melting, which simplifies the manufacturing process and saves material on the protective patch 15, thereby reducing costs.

[0069] Furthermore, such as Figure 4 As shown, the covering portion 152 has a first covering portion 1523 and a second covering portion 1524 that are respectively attached to the boss 112. In the radial direction of the first window 150, the substrate 151, the first covering portion 1523, the first protrusion 1522 and the second covering portion 1524 are connected in sequence.

[0070] Understandably, the second adhesive portion 1524, the first protrusion 1522, the first adhesive portion 1523, and the substrate 151 are arranged sequentially in a direction away from the first window 150 along the radial direction of the first window 150. The boss 112 has a peripheral side surface connecting the substrate 111 and the support surface 1121. The second adhesive portion 1524 is adhered to the support surface 1121, the first adhesive portion 1523 is adhered to the peripheral side surface or to both the peripheral side surface and the support surface 1121, and the substrate 151 is adhered to the substrate 111. The first adhesive portion 1523 and the second adhesive portion 1524 serve to fix the first protrusion 1522, which can improve the stability of the structure of the first protrusion 1522 and reduce the risk of deformation of the first protrusion 1522 during the assembly of the boss 112 and the housing.

[0071] like Figure 6As shown, in some embodiments, the cell cover 100 further includes a protective patch 15 and a plastic bracket 16. The protective patch 15 is attached to the surface of the substrate 111 and has an opening corresponding to the boss 112. The plastic bracket 16 is connected to the protective patch 15 and disposed at the opening. The plastic bracket 16 has a second protrusion 161 and a second window 160 opposite to the support surface 1121. The second protrusion 161 protrudes away from the support surface 1121 in the thickness direction of the substrate 111 and is annularly arranged around the second window 160. The second protrusion 161 and the support surface 1121 form a second adhesive receiving groove.

[0072] The outer periphery of the plastic bracket 16 is connected to the edge of the opening in the protective patch 15, meaning the second opening 160 of the plastic bracket 16 is opposite to the opening in the protective patch 15. A second protrusion 161 is disposed on the support surface 1121 and is annularly arranged around the second opening 160, forming a second adhesive groove around the support surface 1121 and the second protrusion. The insulating and thermally conductive adhesive 400 used to bond the support surface 1121 and the housing can be partially contained within the second adhesive groove.

[0073] When applying the adhesive, the adhesive is placed in the second adhesive container. The second protrusion 161 can prevent the adhesive from overflowing, reduce the spread of the adhesive beyond the support surface 1121 under the squeezing action of the box body, and ensure the uniformity of the adhesive layer thickness between the protrusion 112 and the box body, as well as the adhesive layer thickness between the multiple cells in the battery pack and the box body, thereby ensuring that the multiple cells are reliably connected to the box body.

[0074] In this embodiment of the invention, the plastic bracket 16 is fixedly connected to the boss 112. For example, the plastic bracket 16 can be bonded to the boss 112 before or after assembling the battery cell cover 100. Alternatively, the plastic bracket 16 can be attached to the boss 112 by injection molding, allowing it to be integrated into the cover body 11 during production, thus simplifying the assembly process of the battery cell cover 100.

[0075] When the plastic bracket 16 is bonded and fixed to the boss 112, the plastic bracket 16 can also be bonded and fixed to the protective patch 15. The portion of the protective patch 15 near its opening can overlap with the outer periphery of the plastic bracket 16, for example, the plastic bracket 16 overlaps the outside of the protective patch 15, or the protective patch 15 overlaps the outside of the plastic bracket 16, so as to ensure that the joint between the protective patch 15 and the plastic bracket 16 provides reliable protection for the boss 112.

[0076] In some embodiments of the present invention, the boss 112 further has a peripheral side surface connecting the support surface 1121 and the substrate 151. The plastic bracket 16 may be disposed only on the support surface 1121, or it may be disposed on both the support surface 1121 and the peripheral side surface. Figure 6 As shown, when the plastic bracket 16 is simultaneously provided on the support surface 1121 and the peripheral side surface, the plastic bracket 16 also has a cover portion 162, which surrounds the boss 112 and is provided on the peripheral side surface. In the radial direction of the second window 160, the protective patch 15, the cover portion 162, and the protrusion are connected in sequence.

[0077] In this design, the cover portion 162 and the second protrusion 161 of the plastic bracket 16 are both fixedly connected to the boss 112. The cover portion 162 extends radially outward from the support surface 1121 along the second opening 160, and may cover a portion of the peripheral side surface, or the entire peripheral side surface, or extend outward to a portion that is in contact with the substrate 111. By providing the cover portion 162 to increase the contact area between the plastic bracket 16 and the boss 112, it is beneficial to improve the bonding strength between the plastic bracket 16 and the boss 112.

[0078] Understandably, the cover 162 has a concave surface on the side facing the boss 112 that matches the shape of the boss 112, creating a concave-convex fit between the cover 162 and the boss 112. During the assembly of the plastic bracket 16 and the boss 112, this concave-convex fit can be used to position and install the plastic bracket 16, improving production efficiency. Simultaneously, the cover 162 increases the contact area between the plastic bracket 16 and the boss 112, enhancing the connection strength and preventing the plastic bracket 16 from slipping due to compression during the bonding process between the housing and the boss 112.

[0079] When the plastic bracket 16 has only a protrusion or the cover portion 162 only covers a portion of the peripheral side, the protective patch 15 includes a substrate 151 and a covering portion 152, which are integrally formed. The substrate 151 is attached to the surface of the substrate 111, and the covering portion 152 covers the peripheral side of the protrusion 112 and is connected to the cover portion 162 of the plastic bracket 16.

[0080] The plastic bracket 16 is made of insulating material and covers the periphery of the boss 112. Alternatively, the protective patch 15 and the plastic bracket 16 can cover the boss 112 together. This can isolate the pole post 12 and the boss 112 and prevent creepage and arcing caused by the pole post 12 and the boss 112 being too close.

[0081] like Figure 2As shown, the battery cell cover 100 provided in this embodiment of the invention further includes an insulating member 14. The insulating member 14 is connected to the side of the substrate 111 away from the boss 112. A groove is formed on the side of the cover body 11 away from the boss 112 in the thickness direction of the substrate 111, corresponding to the position of the boss 112. A protrusion 141 is provided on the side of the insulating member 14 near the cover body 11, and the protrusion 141 is located in the groove. A recessed groove 142 is formed on the side of the insulating member 14 away from the substrate 111, corresponding to the position of the protrusion 141, for accommodating the tabs 31 of the electrode assembly 300. The electrode post 12 passes through the insulating member 14.

[0082] The insulating component 14 is typically a plastic structural component located inside the cover plate body 11. A recessed groove 142 is formed on the side of the insulating component 14 away from the substrate 111, corresponding to the protrusion 141. In the cell structure, the insulating component 14 is located between the cover plate body 11 and the electrode assembly 300, defining a space for accommodating the tab 31 between the recessed groove 142 and the electrode assembly 300, thus fully utilizing the internal space of the hollow protrusion 112. This recess in the cover plate body 11 not only reduces the weight of the cover plate body 11 but also accommodates the tab 31, allowing for a larger space inside the cell to house the electrode assembly 300. This increases the space utilization rate within the cell housing 200, thereby further increasing the cell's capacity.

[0083] Furthermore, the protrusion 141 and the groove are contoured. It can be understood that the shape of the groove in the cover body 11 matches the shape of the protrusion 141 in the insulating member 14, thus making greater use of the internal space of the boss 112.

[0084] like Figure 3 , Figure 7 and Figure 8 As shown, the battery cell cover 100 provided in some embodiments of the present invention further includes a connecting piece 17. The connecting piece 17 is located on the side of the insulating member 14 away from the substrate 111, and includes a first contact portion 171 and a second contact portion 172 connected together. The insulating member 14 has a hollow hole 1421 opposite to the boss 112. The first contact portion 171 is connected to the electrode post 12, and the second contact portion 172 is connected to the cover body 11 at the hollow hole 1421 through an insulating heat-conducting member 18. The second contact portion 172 is used to connect the electrode tab 31 of the electrode group 300.

[0085] Depending on the actual distance between the perforated hole 1421 and the cover plate body 11 in the thickness direction of the substrate 111, the insulating heat-conducting component 18 can be inserted through the perforated hole 1421, or it can be located entirely on the side of the insulating component 14 closer to the cover plate body 11. The insulating heat-conducting component 18 can be an insulating thermally conductive adhesive, or it can be a thermally conductive insulating sheet, thermally conductive double-sided adhesive, thermally conductive pad, or other structural components with insulating and thermally conductive properties.

[0086] The part of the battery cell that generates the most heat is the tab 31. The heat from the tab 31 can be transferred to the cover plate body 11 through the second contact portion 172 of the connecting piece 17 and the heat-conducting element. Since the second contact portion 172 is connected to the cover plate body 11 at the perforation 1421, the second contact portion 172 is closest to the boss 112. The temperature of the tab 31 can be quickly transferred to the boss 112 on the cover plate body 11 through the second contact portion 172 of the connecting piece 17, and then the heat is transferred to the battery pack housing through the boss 112, thereby improving the heat dissipation efficiency of the battery pack.

[0087] It should be noted that, provided that heat dissipation performance is met, the insulating part 14 may not have a perforated hole 1421, and the second contact part 172 of the connecting piece 17 does not need to be connected to the boss 112 through the insulating heat-conducting part 18.

[0088] like Figure 3 As shown, the connecting piece 17 also includes a connecting portion 173, which is connected between the first contact portion 171 and the second contact portion 172. The first contact portion 171 and the second contact portion 172 are arranged parallel to each other and at an angle to the connecting portion 173, that is, the connecting piece 17 is in the shape of a "Z", so as to ensure good contact between the first contact portion 171 and the pole post 12 and between the second contact portion 172 and the cover plate body 11.

[0089] In some embodiments of the present invention, the insulating member 14 has a fitting portion that fits into the cover plate body 11. A perforated hole 1421 is formed in the fitting portion, so that the fitting portion and the cover plate body 11 surround a receiving groove 143, and the insulating heat-conducting member 18 is disposed in the receiving groove 143.

[0090] In cases where no through-hole is provided at the position of the substrate 111 corresponding to the boss 112, the bonding portion is bonded to the substrate 111 to form a receiving groove 143, and the second contact portion 172 is connected to the substrate 111 via an insulating heat-conducting member 18. In cases where a through-hole is provided at the position of the substrate 111 corresponding to the boss 112, see [reference needed]. Figure 2 and Figure 3 The fitting part is fitted to the boss 112 to form a receiving groove 143, the insulating heat-conducting element 18 is located in the receiving groove 143, and the second contact part 172 is connected to the insulating heat-conducting element 18.

[0091] When the insulating and thermally conductive component 18 is made of thermally conductive adhesive, the adhesive layer is fitted to the cover plate body 11, preventing adhesive from overflowing between the insulating component 14 and the cover plate body 11. The receiving groove 143 also serves to prevent adhesive overflow, thus ensuring the adhesive layer thickness between the second contact portion 172 and the cover plate body 11, and guaranteeing reliable adhesion between the connecting piece 17 and the cover plate body 11. When the insulating and thermally conductive component 18 is a thermally conductive insulating sheet or other structural component, the receiving groove 143 serves a positioning function, facilitating the assembly of the cell cover plate 100.

[0092] like Figure 8 As shown, the protrusion 141 has a top wall 1411 and an annular side wall 1412. The annular side wall 1412 extends toward the protrusion 112 along the thickness direction, and the top wall 1411 is connected to one end of the annular side wall 1412 near the cover plate body 11. A perforated hole 1421 is defined between the annular side wall 1412 and the top wall 1411.

[0093] The perforated hole 1421 is provided on one side of the top wall 1411. A part of the annular side wall 1412 and a part of the top wall 1411 define the perforated hole 1421. The annular side wall 1412, the top wall 1411 and the cover plate body 11 together form a receiving groove 143. The top wall 1411 can ensure that the protrusion 141 has a certain structural strength.

[0094] Taking the protrusion 141 as a rectangular protrusion as an example, both the annular sidewall 1412 and the top wall 1411 are rectangular. The three side edges of the top wall 1411 are connected to the three side walls of the annular sidewall 1412. The perforated hole 1421 is limited between the other side edge of the top wall 1411 and the other side wall of the annular sidewall 1412. In the thickness direction of the substrate 111, the height of the annular sidewall 1412 is greater than the thickness of the top wall 1411. The three higher groove walls of the receiving groove 143 formed by the annular sidewall 1412 can play a better role in preventing glue overflow.

[0095] like Figure 7 and Figure 8 As shown, in some embodiments of the present invention, the top wall 1411 is provided with an injection hole 1122, and the insulating member 14 has a partition portion 144, which is located inside the settling tank 142 and protrudes from the top wall 1411 along the thickness direction. The partition portion 144 is connected between two opposite tank walls of the settling tank 142, and the injection hole 1122 and the perforated hole 1421 are respectively provided on both sides of the partition portion 144.

[0096] The partition 144 is connected to the inner side of the top wall 1411 and protrudes away from the boss 112, extending from one wall of the sink 142 to the opposite wall, thus forming a partition between the vent hole and the injection hole 1122. When the second insulating thermally conductive element 18 is made of thermally conductive adhesive, the partition 144 can prevent adhesive from overflowing into the injection hole 1122 during the bonding of the second contact portion 172 and the boss 112, thus avoiding clogging of the injection hole 1122.

[0097] It should be noted that when there are multiple bosses 112, the protrusions 141 of the insulating member 14 are also set to be multiple. The injection hole 1122 only needs to be set to correspond to one of the bosses 112, that is, the injection hole 1122 passes through one boss 112 and one corresponding protrusion 141.

[0098] like Figure 5 As shown, in some embodiments of the present invention, the boss 112 includes a plurality of protrusions 1120 stacked sequentially along its protruding direction, and every two adjacent protrusions 1120 are connected to form a stepped surface 1123. It can be understood that in the direction away from the substrate 111, the cross-sectional area of ​​the plurality of protrusions 1120 decreases sequentially to form a stepped boss 112.

[0099] Among them, the topmost protrusion 1120 of the boss 112 is adapted to connect with the housing support, so that a gap is formed between the stepped surface 1123 and the housing, and the acquisition circuit board 52 can be placed in this gap. At the same time, the protrusion 1120 provides structural support for the acquisition circuit board 52, preventing the acquisition circuit board 52 from being suspended and improving the reliability of the acquisition circuit board 52 installation. When the boss 112 is formed by stamping a sheet metal, the boss 112 can be formed by multiple stampings, which can reduce the height of a single stamping, avoid sheet metal breakage, and ensure the structural strength of the boss 112.

[0100] Optionally, the boss 112 includes a first protrusion 1120a and a second protrusion 1120b. The first protrusion 1120a is connected to the surface of the substrate 111, and the second protrusion 1120b protrudes from the first protrusion 1120a on the side of the substrate 111 away from the substrate 111 in the thickness direction. A support surface 1121 is formed on the side of the second protrusion 1120b away from the substrate 111 in the thickness direction. In this embodiment, the boss 112 is a two-layer stepped boss 112. The top second protrusion 1120b is used for support connection with the housing, and the portion of the bottom first protrusion 1120a extending outside the second protrusion 1120b is used to support the acquisition circuit board 52.

[0101] Optionally, such as Figure 5 As shown, a boss 112 is provided between the two pole posts 12, and a second protrusion 1120b is provided at the middle of the first protrusion 1120a in the length direction of the substrate 111, so that the boss 112 forms a stepped structure on both sides in the width direction of the substrate 111. The acquisition circuit board 52 connected to the busbar 51 connected to the two pole posts 12 is supported on the first protrusion 1120a of the two stepped structures respectively.

[0102] When the boss 112 has an internal hollow structure and the insulating member 14 is provided with a hollow hole 1421, the hollow hole 1421 is opposite to the topmost protrusion 1120. That is, the protrusion 141 of the insulating member 14 and the topmost protrusion 1120 surround to form a receiving groove 143. The connecting piece 17 is connected to the insulating heat-conducting member 18 in the receiving groove 143, so that the heat of the tab 31 can be quickly transferred to the housing through the topmost protrusion 1120.

[0103] Furthermore, such as Figure 6As shown, the second protrusion 1120b passes through the opening in the protective patch 15, and the plastic bracket 16 extends from the support surface 1121 toward the first protrusion 1120a in a direction close to the substrate 111. When the plastic bracket 16 and the boss 112 are assembled, the second protrusion 1120b and the plastic bracket 16 can be matched with each other, and the first protrusion 1120a can limit the positioning of the plastic bracket 16, thereby achieving more efficient installation and positioning, ensuring that the plastic bracket 16 and the boss 112 have a large contact area, and improving the connection strength between the plastic bracket 16 and the boss 112.

[0104] like Figure 1 As shown, the battery cell cover 100 provided in this embodiment of the invention also includes an explosion-proof valve 13. The explosion-proof valve 13 is disposed on the substrate 111, and the pole post 12, the explosion-proof valve 13 and the boss 112 are arranged at intervals along the length direction of the substrate 111, with the boss 112 provided between the pole post 12 and the explosion-proof valve 13.

[0105] Specifically, the substrate 111 has a first through hole and a second through hole. An explosion-proof valve 13 is disposed in the first through hole to connect to the internal cavity of the battery cell, and the electrode post 12 passes through the second through hole. When the internal pressure of the battery cell exceeds the safety threshold of the explosion-proof valve 13, the explosion-proof valve 13 opens, and the high-temperature and high-pressure gas in the cavity is discharged through the explosion-proof valve 13, reducing the internal pressure of the battery cell and preventing the battery cell from exploding. The insulating component 14 has an exhaust port corresponding to the position of the explosion-proof valve 13 to facilitate the exhaust of gas by the explosion-proof valve 13.

[0106] The terminal posts 12, explosion-proof valves 13, and bosses 112 are arranged at intervals along the length of the substrate 111, and a boss 112 is provided between the terminal posts 12 and the explosion-proof valves 13. The bosses 112 can be used to block the high-temperature gas or liquid ejected from the explosion-proof valves 13 from reaching the terminal posts 12 and the busbar 51, thereby achieving thermoelectric isolation and improving the safety performance of the battery pack. When there are two terminal posts 12 on the substrate 111, a boss 112 is provided between both terminal posts 12 and the explosion-proof valves 13.

[0107] Based on the presence of a boss 112 between the pole post 12 and the explosion-proof valve 13, bosses 112 can be installed at other locations as needed. A boss 112 may or may not be installed on the side of the pole post 12 furthest from the explosion-proof valve 13. A boss 112 may or may not be installed on the side of the explosion-proof valve 13 furthest from the pole post 12.

[0108] like Figure 1 As shown, the battery cell cover 100 provided in some embodiments of the present invention includes two pole posts 12, and the cover body 11 has two bosses 112. In the length direction of the substrate 111, the two pole posts 12 are respectively disposed on both sides of the explosion-proof valve 13, and the two bosses 112 are respectively disposed on both sides of the explosion-proof valve 13, and a boss 112 is provided between each pole post 12 and the explosion-proof valve 13.

[0109] Optionally, along the length of the substrate 111, the explosion-proof valve 13 is located at the center of the substrate 111, the distance between the two bosses 112 and the explosion-proof valve 13 is equal, and the distance between the two pole posts 12 and the explosion-proof valve 13 is also equal. Along the width of the substrate 111, the explosion-proof valve 13, the bosses 112, and the pole posts 12 are all located at the center of the substrate 111.

[0110] It should be noted that when the cell cover 100 includes two pole posts 12, the two pole posts 12 can be located on the same side of the explosion-proof valve 13. Alternatively, only one boss 112 can be provided to isolate the two pole posts 12 from the explosion-proof valve 13; or, bosses 112 can be provided on both sides of the explosion-proof valve 13, with one boss 112 used to isolate the two pole posts 12 from the explosion-proof valve 13, and the other boss 112 used to isolate the explosion-proof valve 13 from adjacent cells, preventing substances ejected from the explosion-proof valve 13 from reaching adjacent cells.

[0111] The battery cell cover 100 provided in this embodiment of the invention may include only one terminal post 12. Correspondingly, the cover body 11 may have at least one boss 112 for isolating the terminal post 12 and the explosion-proof valve 13. In this case, the other terminal post 12 of the battery cell may be provided on the other end of the battery cell.

[0112] like Figure 9 As shown, this embodiment of the invention also provides a battery cell 1, including a battery cell housing 200, an electrode assembly 300, and a battery cell cover plate 100 as described in any of the above embodiments. The battery cell housing 200 has an opening, and the battery cell cover plate 100 is disposed at the opening and surrounds the battery cell housing 200 to form a receiving cavity. The electrode assembly 300 is disposed in the receiving cavity, and the electrode tabs 31 of the electrode assembly 300 are connected to the electrode posts 12.

[0113] like Figure 10 and Figure 11 As shown, this embodiment of the invention also provides a battery pack, including a housing and a plurality of battery cells 1 as described in any of the above embodiments. The housing has a first plate portion 61 and a second plate portion 62 disposed opposite to each other. The battery cells 1 are disposed in the housing, with a boss 112 supporting and connected to the first plate portion 61, and one end of the battery cell 1 away from the battery cell cover plate 100 supporting and connected to the second plate portion 62. The supporting surface 1121 is connected to the first plate portion 61 by an insulating thermally conductive adhesive 400.

[0114] like Figure 11 As shown, the battery pack also includes a busbar 51, through which two adjacent cells 1 are connected. Optionally, as... Figure 12 and Figure 13As shown, in the thickness direction of the substrate 111, the height of the busbar 51 relative to the first surface of the substrate 111 is less than the height of the boss 112 relative to the first surface of the substrate 111. Thus, when the side of the housing facing the terminal block is flat, a gap exists between the busbar 51 and the housing while ensuring the boss 112 is supported and connected to the housing. This ensures that the boss 112 serves as the main load-bearing component of the cell 1, protecting the busbar 51 and the terminal block 12, and improving the safety of the battery pack.

[0115] like Figure 14 and Figure 15 As shown, the battery pack also includes a data acquisition circuit board 52, which is disposed on the stepped surface 1123. Specifically, the stepped surface 1123 is formed on the first protrusion 1120a, and the data acquisition circuit board 52 is disposed on the first protrusion 1120a and located on one side of the protrusion direction of the second protrusion 1120b.

[0116] Optionally, such as Figure 15 As shown, the side of the first protrusion 1120a away from the substrate 111 is flush with the side of the busbar 51 away from the substrate 111. The acquisition circuit board 52 is located on the side of the first protrusion 1120a and the side of the busbar 51 away from the substrate 111. By making the first protrusion 1120a and the side of the busbar 51 away from the substrate 111 flush, the acquisition circuit board 52 can be laid flat on both, avoiding bending of the acquisition circuit board 52 and ensuring the reliability of the connection between the acquisition circuit board 52 and the busbar 51.

[0117] Optionally, the acquisition circuit board 52 is bonded to the protrusion 1120 on the side facing the substrate 111. Specifically, the acquisition circuit board 52 is located between the first protrusion 1120a and the housing and is bonded to the first protrusion 1120a to further ensure the reliability of the connection between the acquisition circuit board 52 and the bus 51.

[0118] In some embodiments of the present invention, the first plate portion 61 and the second plate portion 62 can be the shell structure of a housing. For example, the first plate portion 61 is the top cover of the housing, and the second plate portion 62 is the bottom shell of the housing. The boss 112 is fitted to the top cover, and the end of the battery cell 1 away from the boss 112 is fitted to the bottom shell. The housing of the housing is usually made of thermally conductive steel or aluminum. The heat of the battery cell 1 is transferred to the housing through the boss 112 of the battery cell 1 and the battery cell housing 200, and heat exchange occurs through convection between the housing and the outside air.

[0119] In other embodiments of the present invention, the first plate portion 61 includes a first housing and a first cold plate, the first cold plate being located between the first housing and the battery cell 1, and the boss 112 being attached to the first cold plate. The second plate portion 62 includes a second housing and a second cold plate, the second cold plate being located between the second housing and the battery cell 1, and one end of the battery cell 1 away from the battery cell cover plate 100 being attached to the second cold plate. The first cold plate and the second cold plate can be any one of a liquid cooling plate, a direct cooling plate, or a phase change material cold plate. The heat from the battery cell 1 can be transferred to the first and second cold plates through the boss 112 and the housing, improving the cooling effect on the battery pack.

[0120] In some embodiments of the present invention, the battery pack includes at least a plurality of battery cells 1 arranged sequentially along the width direction of the substrate 111. In the width direction of the substrate 111, the protrusions 112 of the plurality of battery cells 1 are arranged opposite each other to form a strip-shaped baffle.

[0121] When the cover plate body 11 has only one boss 112, the bosses 112 of multiple battery cells arranged along the width direction of the substrate 111 are arranged to form a strip-shaped baffle. When the cover plate body 11 has multiple bosses 112 arranged along the length direction of the substrate 111, the multiple bosses 112 of multiple battery cells 1 arranged along the width direction of the substrate 111 are arranged one-to-one to form multiple strip-shaped baffles. The strip-shaped baffles can effectively prevent the material ejected from the explosion-proof valve 13 from reaching the terminal post 12 and busbar 51 of the adjacent battery cell 1, and also play a role in guiding the exhaust gas.

[0122] Furthermore, with the explosion-proof valve 13 located between the two bosses 112, two strip-shaped baffles are formed on both sides of the explosion-proof valve 13 of the plurality of battery cells 1 arranged along the width direction of the substrate 111. An exhaust passage 700 is defined between the two strip-shaped baffles, and the gas discharged from the explosion-proof valve 13 can be discharged to the outside of the battery pack along the exhaust passage 700.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell cover plate, characterized in that, include: The cover plate body includes a base plate and a boss. The boss is connected to the surface of the base plate and protrudes from the surface of the base plate along the thickness direction of the base plate. The side of the boss away from the surface of the base plate has a support surface, and the support surface is provided with a blind hole. The support surface is used to support and connect with the casing of the battery pack, and insulating thermally conductive adhesive is suitable to be provided between the two. The blind hole is used to fill the insulating thermally conductive adhesive. The pole post is inserted through the substrate and protrudes from the surface of the substrate; A protective patch includes a substrate and a covering portion. The substrate is attached to the surface of the plate, and the covering portion is connected to the substrate and covers the boss. The portion of the covering portion corresponding to the support surface has a first opening, and the blind hole is located within the range of the first opening.

2. The cell cover plate according to claim 1, characterized in that, In the thickness direction, the cross-sectional dimension of the blind hole gradually decreases from the support surface toward the plate surface.

3. The cell cover plate according to claim 1, characterized in that, Also includes: An explosion-proof valve is disposed on the substrate. The pole, the explosion-proof valve and the boss are arranged at intervals along the length of the substrate, and the boss is provided between the pole and the explosion-proof valve.

4. The cell cover plate according to claim 1, characterized in that, The cover plate body forms a groove on the side of the protrusion away from the protrusion in the thickness direction, corresponding to the position of the protrusion.

5. The cell cover plate according to claim 4, characterized in that, Also includes: An insulating member is connected to the side of the substrate away from the boss in the thickness direction. The side of the insulating member near the cover plate body has a protrusion, which is located in the groove. A recess is formed on the side of the insulating member away from the substrate corresponding to the position of the protrusion for accommodating the electrode tabs of the electrode assembly. The electrode post passes through the insulating member.

6. The cell cover plate according to claim 1, characterized in that, The number of blind holes is multiple, and the multiple blind holes are distributed in a matrix.

7. The cell cover plate according to claim 1, characterized in that, The boss includes a first protrusion and a second protrusion. The first protrusion is connected to the plate surface, and the second protrusion protrudes from the first protrusion on the side of the thickness direction away from the substrate. The support surface is formed on the side of the second protrusion on the thickness direction away from the substrate.

8. A battery cell, characterized in that, include: The cell housing, the electrode assembly, and the cell cover plate as described in any one of claims 1 to 7; The cell housing has an opening, the cell cover plate is disposed in the opening and surrounds the cell housing to form a receiving cavity, the electrode group is disposed in the receiving cavity, and the electrode tabs of the electrode group are connected to the electrode post.

9. A battery pack, characterized in that, include: The housing has a first plate portion and a second plate portion that are arranged opposite to each other; Multiple battery cells as described in claim 8 are disposed in the housing, the boss is supported and connected to the first plate, one end of the battery cell away from the battery cell cover is supported and connected to the second plate, and the supporting surface is connected to the first plate through the insulating thermally conductive adhesive.

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