Battery pack

Abstract

The utility model relates to battery technology field provides a kind of battery pack, the battery pack includes: box, with oppositely arranged first plate part and second plate part;Battery cell, set in box, including shell, explosion-proof valve and pole, shell has opposite first end face and second end face;First end face protrudes with pole and convex hull, explosion-proof valve is set to first end face, pole, explosion-proof valve and convex hull are arranged along the length direction of first end face;Pole and explosion-proof valve between being equipped with convex hull, convex hull is supported with first plate part connection, second end face is supported with second plate part connection.This battery pack's shell of battery cell as support force component, can make full use of the space in box, improve the energy density of battery pack, while it can use convex hull to block the material that explosion-proof valve sprays reaches pole and busbar, realize thermal electric isolation.

Description

Technical Field

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

[0002] A battery pack consists of a housing and battery modules assembled inside the housing. Each battery module is composed of multiple cells connected in a specific series-parallel configuration. The housing provides physical support for the battery modules, protecting them from external impacts, pressure, and other damage, while also preventing the intrusion of moisture, dust, and other impurities. However, current battery pack housings have low internal space utilization, which is detrimental to improving the energy density of the battery pack. Utility Model Content

[0003] This invention provides a battery pack that solves the problem of low internal space utilization in existing battery packs.

[0004] This utility model provides a battery pack, comprising: The housing has a first plate portion and a second plate portion that are arranged opposite to each other; The battery cell, housed within the enclosure, includes a housing, an explosion-proof valve, and a terminal post. The housing has a first end face and a second end face facing away from each other. The first end face has the terminal post and a protrusion. The explosion-proof valve is disposed on the first end face. The terminal post, the explosion-proof valve, and the protrusion are arranged along the length of the first end face. The pole and the explosion-proof valve are provided with the protrusion, which is supported and connected to the first plate and the second end face is supported and connected to the second plate.

[0005] According to the battery pack provided by this utility model, the first end face is provided with a plurality of protrusions arranged along the length direction, and / or the first end face is provided with a plurality of protrusions arranged along its width direction.

[0006] According to the battery pack provided by this utility model, the explosion-proof valve is located between two adjacent convex bulges in the length direction.

[0007] According to the battery pack provided by this utility model, two pole posts are provided on the first end face, the two pole posts are arranged along the length direction, and the bulge and the explosion-proof valve are both located between the two pole posts.

[0008] According to the battery pack provided by this utility model, the housing is provided with at least a plurality of battery cells arranged along the width direction of the first end face, and the protrusions of the plurality of battery cells are arranged opposite to each other in the width direction to form a strip-shaped baffle.

[0009] According to the battery pack provided by this utility model, two terminals are provided on the first end face, the two terminals are arranged along the length direction, the explosion-proof valve is located at the center of the length direction of the first end face, and the two terminals are symmetrically arranged about the explosion-proof valve.

[0010] According to the battery pack provided by this utility model, a plurality of protrusions are provided on the first end face along the length direction, the explosion-proof valve is located between two adjacent protrusions in the length direction, and two adjacent protrusions on both sides of the explosion-proof valve are symmetrically arranged about the explosion-proof valve.

[0011] According to the battery pack provided by this utility model, the convex bulge has multiple layers of protrusions stacked in its convex direction.

[0012] According to the battery pack provided by this utility model, the first plate portion includes a first housing and a first cold plate, the first cold plate is located between the first housing and the convex bulge, and the convex bulge is in contact with the first cold plate; The second plate portion includes a second housing and a second cold plate, the second cold plate being located between the second housing and the second end face, and the second end face being in contact with the second cold plate.

[0013] The battery pack provided by this utility model also includes: A busbar is connected to the pole and located between the pole and the first plate portion, and at least one of the bulge and the busbar is fixed to the first plate portion by adhesive bonding.

[0014] The battery pack provided by this utility model features a protrusion on the first end face of the cell's outer casing. This protrusion supports the first plate of the housing, while the second end face supports the second plate of the housing. This allows the cell's outer casing to act as a load-bearing component, supporting the first and second plates. This prevents significant deformation of the first plate under impact, thereby increasing the cell's volume while ensuring the first plate does not compress the busbars and terminals, or that the compressive force remains within a safe range. This maximizes the use of space within the housing and improves the battery pack's energy density. It also reduces the thickness of the first plate, facilitating lightweight design. Furthermore, the protrusion between the terminals and the explosion-proof valve prevents high-temperature gas or liquid from reaching the terminals and busbars, achieving thermal isolation and improving the battery pack's safety performance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is one of the structural schematic diagrams of the battery pack provided by this utility model.

[0017] Figure 2 This is the second structural schematic diagram of the battery pack provided by this utility model.

[0018] Figure 3 This is the third schematic diagram of the battery pack provided by this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the battery cell in the battery pack provided by this utility model.

[0020] Figure label: 11. First plate; 12. Second plate; 2. Battery cell; 20. Outer shell; 21. Housing; 22. Cover plate; 221. First end face; 222. Second end face; 223. Protrusion; 23. Terminal post; 24. Explosion-proof valve; 3. Busbar. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of the embodiments of this utility model, 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; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model 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.

[0023] The following is combined Figures 1-4 This invention describes the battery pack of the present invention.

[0024] like Figures 1-3 As shown, the battery pack provided in this embodiment of the present invention includes a housing and a battery cell 2. The housing has a first plate portion 11 and a second plate portion 12 disposed opposite to each other. The battery cell 2 is disposed inside the housing and includes a shell 20, an explosion-proof valve 24, and a terminal post 23. The shell 20 has a first end face 221 and a second end face 222 facing away from each other. The first end face 221 is provided with a terminal post 23 and a protrusion 223. The explosion-proof valve 24 is disposed on the first end face 221. The terminal post 23, the explosion-proof valve 24, and the protrusion 223 are arranged along the length direction of the first end face 221. The protrusion 223 is provided between the terminal post 23 and the explosion-proof valve 24. The protrusion 223 is supported and connected to the first plate portion 11, and the second end face 222 is supported and connected to the second plate portion 12.

[0025] Among them, see Figure 4 The outer casing 20 of the battery cell 2 includes a housing 21 and a cover plate 22. The electrode group of the battery cell 2 is located in the cavity formed by the housing 21 and the cover plate 22. The outer casing 20 of the battery cell 2 provides protection for the internal components of the battery cell 2 and can withstand certain external impacts.

[0026] In some alternative embodiments, such as Figure 4 As shown, a first end face 221 is formed on the cover plate 22, and a second end face 222 is formed on the housing 21. The cover plate 22 has through holes for mounting the pole post 23 and the explosion-proof valve 24. The pole post 23 passes through the through holes in the cover plate 22 and is inserted into the cover plate 22. A portion of the pole post 23 is located in the receiving cavity and connected to the pole lug of the pole assembly, while a portion protrudes from the outside of the cover plate 22 to form a pole post terminal.

[0027] In some alternative embodiments, a first end face 221 is formed on the housing 21, and a second end face 222 is formed on the cover plate 22. The housing 21 has through holes for mounting the pole post 23 and the explosion-proof valve 24. The pole post 23 passes through the through holes in the housing 21 and is inserted into the housing 21. A portion of the pole post 23 is located in the receiving cavity and connected to the electrode tab of the pole assembly, while a portion protrudes from the outside of the housing 21 to form a pole post terminal.

[0028] The length and width directions of the first end face 221 are as follows: Figure 4 As shown. In this embodiment, the first end face 221 can be the outer surface of the cover plate 22, and the protrusion 223 can be integrally stamped from the cover plate 22, or it can be welded and fixed to the cover plate 22 as an independent structural component. Figure 1As shown, multiple battery cells 2 are arranged between the first plate portion 11 and the second plate portion 12. The battery pack also includes a busbar 3, which is connected to the terminal post 23 and located between the terminal post 23 and the first plate portion 11. The terminal posts of the multiple battery cells 2 are connected in series and parallel through the busbar 3 to form a battery module. The first end face 221 of the outer casing 20 faces the first plate portion 11, and the second end face 222 faces the second plate portion 12. The protrusion 223 on the first end face 221 is supported and connected to the first plate portion 11, and the second end face 222 is supported and connected to the second plate portion 12. That is, the outer casing 20 of the battery cell 2 is supported and disposed between the first plate portion 11 and the second plate portion 12.

[0029] There is a gap between the explosion-proof valve 24 and the first plate portion 11 to ensure that the gas inside the battery cell 2 can be discharged through the explosion-proof valve 24. The height of the explosion-proof valve 24 relative to the first end face 221 can be set to be less than the height of the protrusion 223 relative to the first end face 221, so as to ensure that there is a gap between the explosion-proof valve 24 and the first plate portion 11 when the side of the first plate portion 11 facing the first end face 221 is flat.

[0030] In traditional battery pack structures, the battery pack relies solely on the rigidity of the first plate 11 to resist external impacts. Due to the large area of ​​the first plate 11, insufficient rigidity can easily lead to deformation. To prevent excessive compression of the busbar 3 due to deformation of the first plate 11, a large space needs to be reserved between the busbar 3 and the first plate 11 in the structural design, and supporting foam needs to be placed between the battery module and the first plate 11. Some designs also incorporate concave and convex structures on the first plate 11 to enhance its rigidity and prevent deformation. However, these measures result in a large gap between the battery module and the first plate 11, wasting space. Increasing the thickness of the first plate 11 to increase its rigidity would increase the weight of the battery pack, hindering lightweight design.

[0031] To address this, this embodiment provides a protrusion 223 on the first end face 221 of the outer casing 20 of the cell 2. The protrusion 223 is used to support and connect with the first plate portion 11, so that the outer casing 20 of the cell 2 itself also serves as a supporting load-bearing component. Under the support of the outer casing 20, large deformation of the first plate portion 11 can be avoided, thereby reducing the thickness of the first plate portion 11 and reducing the weight of the battery pack. Furthermore, while ensuring that the first plate portion 11 does not cause compression to the busbar 3 and the terminal post 23 or that the compression force is within a safe range, the distance between the busbar 3 and the first plate portion 11 can be reduced, that is, the volume of the cell 2 can be increased, so as to make full use of the internal space of the casing and improve the capacity of the cell 2 and the energy density of the entire battery pack.

[0032] Furthermore, a bulge 223 is provided between the electrode post 23 and the explosion-proof valve 24. The bulge 223 separates the electrode post 23 and the explosion-proof valve 24, and can be used to prevent the high-temperature gas discharged from the explosion-proof valve 24 from diffusing to the electrode post 23 and the busbar 3. In the event of thermal runaway of the battery cell 2, the bulge 223 can also prevent the liquid sprayed from the explosion-proof valve 24 from splashing onto the electrode post 23 and the busbar 3.

[0033] The battery pack provided in this embodiment of the utility model, by providing a protrusion 223 on the first end face 221 of the outer shell 20 of the cell 2, uses the protrusion 223 to support and connect with the first plate portion 11 of the housing, and the second end face 222 to support and connect with the second plate portion 12 of the housing, so that the outer shell 20 of the cell 2 itself acts as a supporting load-bearing member between the first plate portion 11 and the second plate portion 12, so as to avoid large deformation of the first plate portion 11 under impact. Thus, the volume of the cell 2 can be increased while ensuring that the first plate portion 11 does not squeeze the busbar 3 and the terminal post 23 or the squeezing force is within a safe range, so as to make full use of the space inside the housing and improve the energy density of the battery pack; it can also reduce the thickness of the first plate portion 11, which is conducive to the lightweight design of the battery pack. At the same time, the protrusion 223 is provided between the terminal post 23 and the explosion-proof valve 24, which can be used to block the high-temperature gas or liquid ejected by the explosion-proof valve 24 from reaching the terminal post 23 and the busbar 3, realizing thermal and electrical isolation and improving the safety performance of the battery pack.

[0034] It should be noted that the battery cell 2 has two terminals 23, namely a positive terminal and a negative terminal. Optionally, both terminals 23 are disposed on the first end face 221. Alternatively, one terminal 23 is disposed on the first end face 221, and the other terminal 23 is disposed on the second end face 222. When the second end face 222 is also provided with a terminal 23, the second end face 222 may also be provided with a protrusion 223 spaced apart from the terminal 23, and the second end face 222 is supported and connected to the second plate portion 12 through the protrusion 223.

[0035] In this embodiment of the invention, the number of protrusions 223 on the first end face 221 can be one or more. The number of protrusions 223 can be specifically determined according to the size of the first end face 221 and the volume and load-bearing capacity of the protrusions 223. When there are multiple protrusions 223, the first end face 221 is provided with multiple protrusions 223 arranged along its length direction; and / or, the first end face 221 is provided with multiple protrusions 223 arranged along its width direction. The dimensions of the multiple protrusions 223 in the length direction and / or width direction of the first end face 221 can be the same or different.

[0036] Based on the existing bulge 223 between the pole post 23 and the explosion-proof valve 24, bulges 223 can be installed at other locations as needed. A bulge 223 may be installed on the side of the pole post 23 furthest from the explosion-proof valve 24, or it may not be installed. A bulge 223 may be installed on the side of the explosion-proof valve 24 furthest from the pole post 23; see [reference needed]. Figure 2 The protrusion 223 may not be provided on the side of the explosion-proof valve 24 away from the pole post 23, see [reference]. Figure 3 .

[0037] In some embodiments of this invention, a plurality of protrusions 223 are provided on the first end face 221 along its length direction. The explosion-proof valve 24 is located between two adjacent protrusions 223 along the length direction of the first end face 221.

[0038] See Figure 1 and Figure 4 As a specific example, the first end face 221 is provided with two pole posts 23 and two protrusions 223. The two protrusions 223 are located between the two pole posts 23, and the explosion-proof valve 24 is located between the two protrusions 223, so as to realize the thermoelectric isolation between the explosion-proof valve 24 and the two pole posts 23.

[0039] See Figure 2 As a specific example, the first end face 221 is provided with two pole posts 23 and two protrusions 223. The two pole posts 23 are located on the same side of the two protrusions 223, and the explosion-proof valve 24 is located between the two protrusions 223. The protrusion 223 on the side of the explosion-proof valve 24 near the pole post 23 is used to prevent the material ejected by the explosion-proof valve 24 from reaching the pole post 23 of the battery cell 2, thereby achieving thermoelectric isolation of the battery cell 2 itself. When multiple battery cells 2 are arranged along the length of the first end face 221 in the housing, the protrusion 223 on the side of the explosion-proof valve 24 near the pole post 23 can be used to prevent the material ejected by the explosion-proof valve 24 from reaching the adjacent battery cell 2, thereby achieving thermoelectric isolation between two adjacent battery cells 2.

[0040] In some embodiments of this utility model, at least a plurality of battery cells 2 are arranged along the width direction of the first end face 221 inside the box, and the protrusions 223 of the plurality of battery cells 2 are arranged opposite to each other in the width direction of the first end face 221 to form a strip-shaped baffle.

[0041] Specifically, when there is only one protrusion 223 on the first end face 221, the protrusions 223 of multiple battery cells 2 arranged along the width direction of the first end face 221 are arranged to form a strip-shaped baffle. When there are multiple protrusions 223 arranged along the length direction of the first end face 221, the multiple protrusions 223 of multiple battery cells 2 arranged along the width direction of the first end face 221 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 24 from reaching the terminal post 23 and busbar 3 of the adjacent battery cell 2, and also play a role in guiding the exhaust gas.

[0042] Furthermore, when the explosion-proof valve 24 is located between two adjacent protrusions 223 along the length of the first end face 221, two strip-shaped baffles are formed on both sides of the explosion-proof valve 24 of the plurality of battery cells 2 arranged along the width of the first end face 221. An exhaust channel is defined between the two strip-shaped baffles, the first end face 221, and the first plate portion 11, and the gas discharged from the explosion-proof valve 24 can be discharged to the outside of the battery pack along this exhaust channel.

[0043] In related technologies, the explosion-proof valve 24 and the terminal post 23 are located at opposite ends of the battery cell 2, for example, the terminal post 23 is located at the top of the battery cell 2 and the explosion-proof valve 24 is located at the bottom of the battery cell 2. To ensure that the gas discharged from the explosion-proof valve 24 can be discharged outside the battery pack, an exhaust channel needs to be provided between the casing and the bottom of the battery cell 2. In this embodiment, the explosion-proof valve 24 and the terminal post 23 are located at the same end. The exhaust channel is formed between the first end face 221 and the first plate portion 11 by the protrusion 223 supported between the first end face 221 and the first plate portion 11. This eliminates the need for a separate exhaust channel, improving the space utilization within the casing, which is beneficial for increasing the volume of the battery cell 2 and improving the energy density of the battery pack.

[0044] In this embodiment of the invention, the protrusion 223 adjacent to the explosion-proof valve 24 is preferably rectangular, and its dimension in the width direction of the first end face 221 is slightly smaller than the width of the first end face 221, thus providing a better blocking effect on the material ejected from the explosion-proof valve 24. For protrusions 223 in other positions, they can be set as rectangles, circles, triangles, or rhombuses, etc., according to requirements or available space.

[0045] In some embodiments of this utility model, two pole posts 23 are provided on the first end face 221. The two pole posts 23 are arranged along the length direction, and the protrusion 223 and the explosion-proof valve 24 are both located between the two pole posts 23. See Figure 1 That is, the side of the pole post 23 away from the explosion-proof valve 24 does not have a protrusion 223. The two pole posts 23 can be set close to the two ends of the first end face 221 in the length direction, so as to reserve a large space between the two pole posts 23 to set multiple or large-area protrusions 223, thereby improving the support strength.

[0046] In the battery pack structure, to facilitate the installation of the busbar 3, among the multiple battery cells 2 arranged along the width direction of the first end face 221, the polarities of the opposing terminals 23 of two adjacent battery cells 2 in the width direction of the first end face 221 are opposite, that is, the positive and negative terminals of two adjacent battery cells 2 are opposite to each other. To facilitate the dissipation of heat inside the battery pack, the explosion-proof valves 24 of the multiple battery cells 2 arranged along the width direction of the first end face 221 are also arranged opposite to each other in the width direction of the first end face 221, so that the gas discharged from the multiple explosion-proof valves 24 can be discharged along the set exhaust channel.

[0047] like Figure 1 and Figure 4 As shown, in some embodiments of this utility model, two pole posts 23 are provided on the first end face 221, and the two pole posts 23 are arranged along the length direction of the first end face 221. The explosion-proof valve 24 is located at the center of the length direction of the first end face 221, and the two pole posts 23 are symmetrically arranged about the explosion-proof valve 24. It can be understood that a protrusion 223 is provided between the two pole posts 23 and the explosion-proof valve 24. The protrusions 223 on both sides of the explosion-proof valve 24 of the multiple battery cells 2 arranged in the width direction of the first end face 221 are arranged to form two strip-shaped baffles. An exhaust channel is defined between the two strip-shaped baffles, the first end face 221 and the first plate portion 11, and the gas discharged from the explosion-proof valve 24 of the multiple battery cells 2 can be concentrated and discharged to the outside of the battery pack along the exhaust channel.

[0048] In this embodiment, the explosion-proof valve 24 is positioned at the center of the length direction of the first end face 221, and the two terminals 23 are symmetrically arranged about the explosion-proof valve 24, so that the polarity of the terminals 23 of each cell 2 can be set to be the same. When multiple cells 2 are arranged along the width direction of the first end face 221, each pair of adjacent cells 2 is arranged at 180°, which allows the explosion-proof valves 24 of adjacent cells 2 to be opposite each other and the positive and negative terminals to be opposite each other, which is beneficial for the concentrated heat dissipation of the battery pack and the setting of the busbar 3. At the same time, since there is no need to set two types of cells 2 with opposite terminal polarities 23, the production of cells 2 is simplified and error prevention is facilitated.

[0049] Furthermore, the first end face 221 is provided with a plurality of protrusions 223 arranged along its length direction. The explosion-proof valve 24 is located between two adjacent protrusions 223 in the length direction, and the two adjacent protrusions 223 on both sides of the explosion-proof valve 24 are symmetrically arranged about the explosion-proof valve 24. In this way, when multiple battery cells 2 are arranged along the width direction of the first end face 221, arranging each two adjacent battery cells 2 at 180°, it can also ensure that the two adjacent protrusions 223 on both sides of the explosion-proof valve 24 of the multiple battery cells 2 are arranged as two strip-shaped baffles.

[0050] In some embodiments of this utility model, the protrusion 223 has multiple layers of protrusions stacked in its protruding direction. The protrusion 223 serves a supporting function and needs to reach a certain height. When the protrusion 223 is formed by stamping a plate-like part, excessively high single stamping height can easily cause the plate to break or affect the structural strength of the protrusion 223. This embodiment sets the protrusion 223 as a multi-layered protrusion structure, which can be formed by multiple stamping processes. This reduces the height of a single stamping, thereby preventing plate breakage and ensuring the structural strength of the protrusion 223.

[0051] In this embodiment of the invention, the convex bulge 223 and the first plate portion 11 can be directly connected or connected through an intermediate medium, with the purpose of transmitting load between the first plate portion 11 and the convex bulge 223. The second end face 222 and the second plate portion 12 can be directly connected or connected through an intermediate medium, with the purpose of transmitting load between the second plate portion 12 and the second end face 222.

[0052] When the protrusion 223 is in direct contact with the first plate 11, the heat of the battery cell 2 can be transferred to the first plate 11 through the protrusion 223, thereby cooling the battery cell 2. Similarly, when the second end face 222 is in direct contact with the second plate 12, the heat of the battery cell 2 can be transferred to the second plate 12 through the second end face 222, thereby cooling the battery cell 2.

[0053] When the protrusion 223 is connected to the first plate portion 11 through an intermediate medium, the intermediate medium can be a thermally conductive medium to facilitate the transfer of heat from the battery cell 2 to the first plate portion 11 via the protrusion 223. Similarly, when the second end face 222 is connected to the first plate portion 11 through an intermediate medium, the intermediate medium can be a thermally conductive medium to facilitate the transfer of heat from the battery cell 2 to the second plate portion 12 via the second end face 222. The thermally conductive medium can be an adhesive with certain thermal conductivity properties.

[0054] In some embodiments of this utility model, the first plate portion 11 and the second plate portion 12 can be the outer shell 20 structure of the housing. For example, one of the first plate portion 11 and the second plate portion 12 is the first shell of the housing, and the other is the second shell of the housing. The protrusion 223 is fitted with the first shell, and the second end face 222 is fitted with the second shell. The heat of the battery cell 2 is transferred to the outer shell 20 of the housing through the protrusion 223 and the second end face 222. The outer shell 20 of the housing is usually made of thermally conductive steel or aluminum. The heat of the battery cell 2 is transferred to the outer shell 20 of the housing, and heat exchange occurs between the outer shell 20 and the outside air through convection.

[0055] In other embodiments of this invention, the first plate portion 11 includes a first housing and a first cold plate, the first cold plate being located between the first housing and the protrusion 223, with the protrusion 223 in contact with the first cold plate. The second plate portion 12 includes a second housing and a second cold plate, the second cold plate being located between the second housing and a second end face 222, with the second end face 222 in contact with the second cold plate. The first and second cold plates can be any of a liquid-cooled plate, a direct-cooled plate, or a phase-change material cold plate. The heat from the battery cell 2 can be transferred to the first and second cold plates through the protrusion 223 and the second end face 222, improving the cooling effect on the battery pack.

[0056] In some embodiments of this invention, at least one of the convex shroud 223 and the busbar 3 is glued to the first plate portion 11. Thus, multiple battery cells 2 can be connected as a whole through the first plate portion 11, forming a thermally conductive connection between the convex shroud 223 and / or the busbar 3 and the first plate portion 11. Specifically, the side of the convex shroud 223 away from the first end face 221 is the connecting surface, and the connecting surface is glued to the first plate portion 11. The side of the busbar 3 away from the terminal post 23 is glued to the first plate portion 11.

[0057] In some embodiments of this invention, the protrusion 223 and the first plate 11 are bonded and fixed together by structural adhesive. The structural adhesive has certain thermal conductivity, enabling stable fixing of the protrusion 223 and the first plate 11. It also possesses high strength, allowing it to withstand large loads and exhibiting excellent resistance to dynamic loads or impacts. Furthermore, the structural adhesive exhibits minimal deformation under long-term stress, which helps maintain effective support of the protrusion 223 for the first plate 11, thus protecting the busbar 3 and the terminal post 23.

[0058] In some embodiments of this invention, the busbar 3 and the first plate 11 are bonded and fixed together with thermally conductive adhesive. The thermally conductive adhesive has high thermal conductivity and maintains stable performance over a wide temperature range. This facilitates the rapid transfer of heat from the battery cell 2 through the terminal post 23, the busbar 3, and the thermally conductive adhesive to the first plate 11. Simultaneously, the thermally conductive adhesive is deformable under low compressive force, reducing the force exerted by the first plate 11 on the busbar 3 and preventing excessive compression of the busbar 3 by the first plate 11.

[0059] Furthermore, the distance between the convex bulge 223 and the first plate portion 11 is smaller than the distance between the busbar 3 and the first plate portion 11. This allows the convex bulge 223 to serve as the main load-bearing part of the cell 2, thereby transmitting force to the outer casing 20 of the cell 2, protecting the busbar 3 and the terminal post 23, and improving the safety performance of the battery pack.

[0060] In the case where the protrusion 223 is in direct contact with the first plate 11, i.e. the distance between the protrusion 223 and the first plate 11 is zero, the distance between the busbar 3 and the first plate 11 is greater than zero. At this time, the busbar 3 and the first plate 11 can be set as a gap, or they can be fixed by thermally conductive adhesive. Both methods can ensure that the load acting on the first plate 11 can be preferentially transferred to the outer casing 20 of the cell 2, so as to protect the busbar 3 and the terminal 23.

[0061] When both the convex shank 223 and the busbar 3 are bonded to the first plate portion 11 with adhesive, the distance between the convex shank 223 and the first plate portion 11 is less than the distance between the busbar 3 and the first plate portion 11, resulting in a thinner adhesive layer between the convex shank 223 and the first plate portion 11 than between the busbar 3 and the first plate portion 11. Alternatively, both the convex shank 223 and the busbar 3 can be connected to the first plate portion 11 with thermally conductive adhesive, which improves the thermal conductivity from the cell 2 to the first plate portion 11; or the convex shank 223 can be connected to the first plate portion 11 with structural adhesive, and the busbar 3 can be connected to the first plate portion 11 with thermally conductive adhesive. Both methods allow the load acting on the first plate portion 11 to be preferentially transferred to the outer casing 20 of the cell 2, thus protecting the busbar 3 and the terminal post 23.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such 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 this utility model.

Claims

1. 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; The battery cell, housed within the enclosure, includes a housing, an explosion-proof valve, and a terminal post. The housing has a first end face and a second end face facing away from each other. The first end face has the terminal post and a protrusion. The explosion-proof valve is disposed on the first end face. The terminal post, the explosion-proof valve, and the protrusion are arranged along the length of the first end face. The pole and the explosion-proof valve are provided with the protrusion, which is supported and connected to the first plate and the second end face is supported and connected to the second plate.

2. The battery pack according to claim 1, characterized in that, The first end face is provided with a plurality of protrusions arranged along the length direction, and / or the first end face is provided with a plurality of protrusions arranged along its width direction.

3. The battery pack according to claim 2, characterized in that, The explosion-proof valve is located between two adjacent convex bulges along the length direction.

4. The battery pack according to claim 1, characterized in that, Two pole posts are provided on the first end face, and the two pole posts are arranged along the length direction. The convex bulge and the explosion-proof valve are both located between the two pole posts.

5. The battery pack according to claim 1, characterized in that, The housing contains at least a plurality of battery cells arranged along the width direction of the first end face, and the protrusions of the plurality of battery cells are arranged opposite to each other in the width direction to form a strip-shaped baffle.

6. The battery pack according to claim 5, characterized in that, Two pole posts are provided on the first end face, and the two pole posts are arranged along the length direction. The explosion-proof valve is located at the center of the length direction of the first end face, and the two pole posts are symmetrically arranged about the explosion-proof valve.

7. The battery pack according to claim 6, characterized in that, The first end face is provided with a plurality of protrusions arranged along the length direction, the explosion-proof valve is located between two adjacent protrusions in the length direction, and the two adjacent protrusions on both sides of the explosion-proof valve are symmetrically arranged about the explosion-proof valve.

8. The battery pack according to claim 1, characterized in that, The convex hull has multiple layers of protrusions stacked in its convex direction.

9. The battery pack according to claim 1, characterized in that, The first plate portion includes a first housing and a first cold plate, the first cold plate being located between the first housing and the protrusion, the protrusion being in contact with the first cold plate; The second plate portion includes a second housing and a second cold plate, the second cold plate being located between the second housing and the second end face, and the second end face being in contact with the second cold plate.

10. The battery pack according to claim 1, characterized in that, Also includes: A busbar is connected to the pole and located between the pole and the first plate portion, and at least one of the convex bulge and the busbar is fixed to the first plate portion by adhesive bonding.

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