Battery pack

Abstract

Battery pack, characterized in that the battery pack (10) comprises the following: at least two single cells (102); a base plate which supports the individual cells (102), wherein one side of the individual cells (102) facing the base plate is provided with an explosion protection valve (1021), wherein the base plate has a barrier structure (22), wherein the barrier structure (22) forms a vent channel (220), wherein the orthogonal projection of the explosion protection valve (1021) onto the underside of the individual cells (102) and the orthogonal projection of the vent channel (220) onto the underside of the individual cells (102) overlap at least partially.

Description

Technical field

[0001] The present utility model relates to the technical field of battery packs, in particular a battery pack. Background technology

[0002] Thermal propagation refers to the phenomenon that, after a single cell in a battery pack has triggered thermal propagation due to misuse (e.g., mechanical damage, overcharging, high temperatures, etc.), it subsequently triggers thermal propagation in neighboring or other normal single cells, leading to a chain reaction.

[0003] In the prior art, an arrangement of thermal insulation material is typically used between adjacent individual cells to prevent and delay the rapid diffusion of heat between the thermally perforated individual cell and the adjacent normal individual cell, thereby limiting thermal perforation. However, this solution has insufficient limiting capacity for thermal perforation, particularly after the explosion protection valve of the individual cell is opened. Electrolyte, gases inside the individual cell, and other high-temperature materials escape from the individual cell and flow into the battery pack, bringing the adjacent normal individual cells into direct contact with the high-temperature materials. This leads to a rapid increase in local temperature, easily causing the phenomenon of thermal perforation.

[0004] Therefore, there is an urgent need for a battery pack to solve the aforementioned technical problem. Content of the utility model

[0005] The purpose of the present utility model is to provide a battery pack that has the ability to limit the phenomenon of thermal runaway.

[0006] To achieve this purpose, the present utility model provides the following technical solution: The battery pack comprises at least two individual cells and a base plate, wherein the base plate supports the individual cells, wherein one side of the individual cells facing the base plate is provided with an explosion protection valve, wherein the base plate has a barrier structure, wherein the barrier structure forms a vent channel, wherein the orthogonal projection of the explosion protection valve onto the underside of the individual cells and the orthogonal projection of the vent channel onto the underside of the individual cells at least partially overlap.

[0007] Advantageous effect of the present utility model: The base plate has a barrier structure, the barrier structure being arranged near the underside of the individual cells and forming a vent channel. After the explosion protection valve has been opened, the high-temperature materials (gases, liquids, etc.) flowing out of the pressure relief opening can be discharged via the vent channel.Simultaneously, the orthogonal projection of the explosion protection valve onto the underside of the individual cells and the orthogonal projection of the vent channel onto the underside of the individual cells overlap at least partially, allowing the vent channel to communicate with the pressure relief opening. Furthermore, the barrier structure can guide and block the high-temperature materials discharged via the explosion protection valve, ensuring that the high-temperature materials, after exiting the pressure relief opening, flow in the predetermined direction and along the flow path, preventing disturbance to the surrounding normal individual cells and thus achieving the effect of limiting thermal propagation. Illustration of the attached figures Fig. Figure 1 is an exploded view of the partial structure of the battery pack provided by the present utility model; Fig. Figure 2 is a schematic diagram of the arrangement of partial individual cells in the battery pack; Fig. Figure 3 is a perspective view of the structure of a base plate in the present utility model; Fig. 4 is a local magnification of area A in Fig. 3; Fig. 5 is an assembled underside view of the single cell and the base plate; Fig. 6 is a cross-section along the direction BB in Fig. 5; Fig. 7 is an assembled top view of the single cell and the base plate mounted on the structural plate; Fig. 8 is a cross-section along the CC direction in Fig. 7; Fig. 9 is a local enlargement of the area D in Fig. 8; Fig. 10 is a local enlargement of the area E in Fig. 9; Fig. Figure 11 is a schematic diagram of the position of the thermally conductive adhesive bonding zone on the structural plate. In the attached drawings:

[0008] Battery pack 10; structural plate 101; outlet opening 1011; thermally conductive adhesive bonding zone 1012; single cell 102; explosion protection valve 1021; first insulating plate 21; barrier structure 22; venting channel 220; second insulating plate 23; adhesive layer 24. Specific embodiments

[0009] The present utility model is described in detail below with reference to the drawings and the exemplary embodiments. It should be understood that the specific exemplary embodiments described here serve only to illustrate the present utility model and do not limit it. Furthermore, it should be noted that, to facilitate the description, only parts and not all structures relevant to the present utility model are shown in the drawings.

[0010] In the description of this utility model, the terms "connected," "connected," "fastened," and "adjacent" are to be understood broadly, unless explicitly defined or limited otherwise. This may refer, for example, to a fixed connection, a detachable connection, or an integral design; it may be a mechanical or electrical connection; it may be a direct connection or an indirect connection through an intermediate medium; it may be the internal communication between two components or the interaction between two components. The specific meaning of the aforementioned terms in this utility model can be understood by a person skilled in the art in this field according to the specific circumstances.

[0011] In the present utility model, an arrangement of the first feature "above" or "below" the second feature may include direct contact between the first and second features, or it may include the fact that the first and second features are not in direct contact, but are connected by another feature between them, unless explicit provisions and limitations apply. Furthermore, the arrangement of the first feature "above," "above," and "on" the second feature includes the first feature being directly above or obliquely above the second feature, or it merely indicates that the horizontal height of the first feature is higher than that of the second feature.The arrangement of the first feature “below”, “underneath”, and “below” the second feature implies that the first feature is directly below or diagonally below the second feature, or it simply indicates that the horizontal height of the first feature is lower than that of the second feature.

[0012] In the description of the present embodiment, the directional or positional relationships of the terms "top," "bottom," "right," "left," etc., are based on the directional or positional relationships shown in the drawings and serve only to facilitate the description and simplify operation, rather than indicating or suggesting that the designated devices or components must have a specific orientation and be designed and operated in a specific orientation. Therefore, they cannot be understood as a limitation of the present utility model. Furthermore, the terms "first" and "second" serve only for differentiation in the description and have no special meaning.

[0013] The battery pack 10 provided by the present utility model is described below with reference to the Fig. 1 to Fig. 11 explained.

[0014] As in Fig. 1 to Fig. As shown in Figure 3, the battery pack 10 comprises a base plate and at least two individual cells 102, wherein the at least two individual cells 102 are arranged, and wherein the base plate can support the individual cells. The underside of each individual cell 102, i.e., the side of the individual cells 102 facing the base plate, is provided with an explosion protection valve 1021. If the individual cell 102 experiences thermal rupture, the explosion protection valve 1021 on the underside of the individual cell 102 can burst due to internal pressure, forming a pressure relief opening. The high-temperature materials inside the individual cell 102 then flow out of the individual cell 102 through the pressure relief opening, thus preventing the individual cell 102 from exploding due to excessive internal pressure.

[0015] However, after the high-temperature materials have flowed out of the pressure relief opening, they tend to exhibit a diffuse flow tendency due to the pressure. In particular, the high-temperature gas readily transfers heat to the adjacent normal single cell 102, causing the adjacent normal single cell 102 to subsequently overheat and become uncontrolled due to the high temperature. For this purpose, the base plate further incorporates a barrier structure 22, which is located near the bottom of the single cells 102 and can form a vent channel 220. The venting function of this vent channel 220 means that the high-temperature materials (gases, liquids, etc.) that flow out of the pressure relief opening after the opening of the explosion protection valve 1021 can be discharged via the vent channel 220.Simultaneously, the orthogonal projection of the explosion protection valve 1021 onto the underside of the individual cells 102 and the orthogonal projection of the vent channel 220 onto the underside of the individual cells 102 overlap at least partially, allowing the vent channel 220 to communicate with the pressure relief opening. Furthermore, the barrier structure 22 can guide and block the high-temperature materials discharged via the explosion protection valve 1021, so that the high-temperature materials, after flowing out of the pressure relief opening, flow in the specified direction and flow path, preventing disturbance of the surrounding normal individual cells 102 and thus achieving the effect of limiting thermal propagation.

[0016] Specifically, as in Fig. 3 and Fig. As shown in Figure 4, the base plate comprises a first insulating plate 21 and a structural plate 101, wherein the structural plate 101 is primarily used for load bearing and impact protection and is therefore preferably made of a metallic material. The first insulating plate 21 is used to prevent a short circuit between the structural plate 101 and the single cell 102 and is therefore preferably made of insulating material and arranged between the structural plate 101 and the single cell 102. The barrier structure 22 is arranged on the side of the first insulating plate 21 facing away from the single cell 102 and projects beyond it in the direction from the single cell 102 to the structural plate 101 (as indicated by the arrow X in the drawing).In the present embodiment, the barrier structure 22 has an internal contour in a closed shape, such as an elliptical shape, a waisted shape, etc., extending from the individual cell 102 to the structural plate 101, and can form a vent channel 220. The vent channel 220 allows the passage of high-temperature materials, and the barrier structure 22 can restrict the direction and flow path of the high-temperature materials as they pass through the vent channel 220. After the explosion protection valve 1021 ruptures, the high-temperature materials can enter the vent channel 220 directly, preventing an uncontrolled flow of the high-temperature materials through any gaps that may form between the base plate and the underside of the individual cells 102.

[0017] Optionally, the side surface of the base plate facing the individual cell 102 can be sealed and connected to the underside of the individual cell 102. For example, in some embodiments, a sealant layer is arranged between the first insulating plate 21 and the underside of the individual cell 102. The sealant layer can both create an adhesive bond between the first insulating plate 21 and the underside of the individual cell 102 and eliminate gaps between the first insulating plate 21 and the underside of the individual cell 102, thus preventing high-temperature materials from flowing through the gaps and negatively affecting the other normal individual cells 102.It should be noted that the present utility model does not restrict the relative position of the base plate and the single cell 102 in the specific use, as long as the plate component which is arranged on the side of the single cell 102 on which the explosion protection valve 1021 is arranged and which is provided with the aforementioned locking structure 22 can be defined as the base plate or part of the base plate which is to be protected by the present utility model.

[0018] As in Fig. 5 and Fig. As shown in Figure 6, the orthogonal projection of the vent channel 220 onto the underside of the single cell 102 (i.e., the projection in the direction perpendicular to the underside of the single cell 102 with reference to the direction indicated by the arrow Y) and the orthogonal projection of the explosion protection valve 1021 onto the underside of the single cell 102 are arranged to overlap at least partially, i.e., the two orthogonal projections may overlap completely, or have a partial overlap, or one orthogonal projection may be completely contained within the other orthogonal projection, thus enabling the vent channel 220 and the pressure relief opening to communicate correspondingly when the base plate is installed in the battery pack 10 and the explosion protection valve 1021 opens and forms the pressure relief opening.This means that the high-temperature materials can flow smoothly into the corresponding vent channel 220 after exiting the pressure relief opening. Once the high-temperature materials have flowed into the vent channel 220, the inner wall of the vent channel 220 can guide the high-temperature materials, thus preventing them from flowing parallel to the bottom of the individual cell 102 or from diffusing directly at the explosion protection valve 1021. This prevents the high-temperature materials from negatively affecting adjacent individual cells 102 after exiting the pressure relief opening due to a change in flow direction, thereby limiting thermal propagation.

[0019] With reference to the Fig. 3 and Fig. 4. Optionally, the height by which the barrier structure 22 projects above the first insulating plate 21 must be no less than 3 mm and no more than 10 mm. For example, this height can be set to dimensions such as 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. If the height by which the barrier structure 22 projects above the first insulating plate 21 is less than 3 mm, the vent channel 220 will have a shorter length, and the containment capacity for the high-temperature materials will be weaker, particularly the containment capacity for diffuse flow will be insufficient. If the height by which the barrier structure 22 projects above the first insulating plate 21 is more than 10 mm, the barrier structure 22 will occupy more space within the battery pack 10, thus reducing the space utilization within the battery pack 10.

[0020] With reference to Fig. 2, Fig. 3 and Fig. The flow area of ​​the vent channel 220 S1 is preferably 6, as is the notch area of ​​the explosion protection valve 1021 S2, and S1 and S2 satisfy: 1 ​​≤ S1 / S2 ≤ 6. If S1 / S2 is less than 1, for example 0.5, this reduces the flow capacity of the vent channel 220 and impairs the escape of the high-temperature materials. If S1 / S2 is greater than 6, for example 7 or 7.5, this reduces the limiting capacity of the barrier structure 22 for the high-temperature materials, which could easily affect other parts in the battery pack 10 in the event of an explosion. Therefore, in some embodiments, S1 and S2 can be set to satisfy ratio relationships such as 1, 2, 3, 4, 5, 6, i.e., the value of S1 / S2 can be 1, 2, 3, 4, 5, 6 or 1,5, 2,4, etc.

[0021] Specifically, the flow area S1 of the vent channel 220 is the cross-sectional area or the average cross-sectional area in the vent channel 220 in the direction perpendicular to the flow path of the high-temperature materials. For example, in the present embodiment, with reference to the Fig. 6 the high-temperature materials in the direction of arrow X in Fig. 6 through the vent 220. The vent 220 is a columnar space whose axis runs in the vertical direction and whose cross-sections are all waist-shaped regions with the same area. According to the definition of the flow area S1, the cross-sectional area running in the horizontal direction (i.e., the area of ​​the waist-shaped region) is defined as the flow area S1.

[0022] Furthermore, preferably the notch surface S2 of the explosion protection valve 1021 has a dimension of not less than 80 mm. 2 and no more than 1,400 mm2 This fulfills the pressure relief requirement of the individual cell and ensures that the explosion protection valve 1021 can achieve a sufficient pressure relief effect if the individual cell 102 exhibits thermal penetration. For example, in some embodiments, the notch surface S2 of the explosion protection valve 1021 can be designed with surface areas such as 80 mm². 2 , 100 mm 2 , 140 mm 2 , 300 mm 2 , 650 mm 2 , 1,300 mm 2 The flow area S1 of the vent channel can be adjusted. Optionally, the flow area S1 of the vent channel can be reduced from 220 to 80 mm. 2 ≤ S1 ≤ 4,000 mm 2 set, for example, to surface sizes such as 80 mm 2 , 300 mm 2 , 900 mm 2 , 1,800 mm 2 , 2,900 mm 2 , 3,900 mm 2This ensures that the vent channel 220 has a suitable venting capacity and that the structural strength and protective performance of the base plate are not negatively affected. However, in order to consider both the flow capacity of the vent channel 220 and the limiting capacity for the high-temperature materials, and to achieve a more optimal effect of thermal propagation limitation, it is also necessary to adjust the flow area S1 of the vent channel 220 according to the above ratio of 1 ≤ S1 / S2 ≤ 6 in coordination with the notch area S2 of the explosion protection valve 1021.

[0023] With reference to Fig. 7 to Fig. 8 In the present embodiment, the battery pack 10 further comprises a structural plate 101. The structural plate 101 is arranged on the side of the individual cell 102 on which the explosion protection valve 1021 is arranged and has an outlet opening 1011. The outlet opening 1011 serves to discharge the high-temperature materials that flow out of the pressure relief opening from the battery pack 10. With reference to Fig. 9 The orthogonal projection of the vent channel 220 onto the underside of the single cell 102 and the orthogonal projection of the outlet opening 1011 onto the underside of the single cell 102 overlap at least partially, allowing the outlet opening 1011 and the vent channel 220 to communicate with each other, ensuring that the high-temperature materials can flow out of the battery pack 10 after passing through the vent channel 220 and the outlet opening 1011.

[0024] Preferably, in the present embodiment, the barrier structure 22 is made of an insulating material, which prevents the formation of an electrical connection between the conductive material that is discharged through the vent channel 220 and the adjacent structure, thus preventing short circuits and arcing. Furthermore, at least a portion of the barrier structure 22 extends into the outlet opening 1011 along the path from the individual cell 102 to the structural plate 101. In most battery packs 10, the structural plate 101 is generally made of a metallic material, and to avoid the risk of a short circuit, an insulating coating is usually provided on the surface of the structural plate 101.However, during the manufacturing process of the structural plate 101, it is often difficult to provide an insulating coating on the inner wall of the outlet opening 1011, frequently resulting in insufficient insulation performance or strength of the insulating coating on the inner wall of the outlet opening 1011. If thermal conductivity occurs in the individual cell 102, the conductive materials (especially the electrolyte) tend to arc with the structural plate 101 as they flow out through the outlet opening 1011, which can easily lead to burning and thermal conductivity propagation to other adjacent cells.

[0025] In the present embodiment, however, due to the fact that the barrier structure 22 is made of an insulating material and at least part of the barrier structure 22 is inserted into the outlet opening 1011, the conductive material such as the electrolyte and at least part of the inner wall of the outlet opening 1011 can be isolated and spaced apart from each other, thereby reducing the phenomenon of arcing and achieving the effect of limiting thermal propagation.

[0026] Preferably, in some embodiments, the barrier structure 22 is arranged at least flush with the outlet opening 1011 along the direction from the individual cell 102 to the structure plate 101; that is, the barrier structure 22 can be arranged both flush with the outlet opening 1011 and extend completely through the outlet opening 1011 and project beyond it. For example, along the direction from the individual cell 102 to the structure plate 101, the end of the barrier structure 22 facing away from the individual cell 102 is arranged flush with the surface of the structure plate 101 facing away from the individual cell 102, thereby ensuring that the barrier structure 22 is arranged in an insulating manner between the conductive material and the structure plate 101 during the flow of the conductive material, such as the electrolyte, through the vent channel 220.

[0027] Of course, with reference to Fig. 10, the end of the barrier structure 22 facing away from the individual cell 102 also projects beyond the surface of the structural plate 101 facing away from the individual cell 102 in the direction from the individual cell 102 to the structural plate 101. This allows for better insulation between the conductive material and the structural plate 101, can further extend the length of the vent channel 220, and achieves a better flow direction restriction effect. Furthermore, preferably the projection height H is not less than 0.2 mm and not more than 5 mm, thereby achieving good insulation while simultaneously preventing an excessively large projection height H from negatively affecting the assembly of the battery pack 10. By way of example, in some embodiments, this projection height H can be set to dimensions such as 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0028] In the present embodiment, the first insulating plate 21 is arranged parallel to the underside of the single cell 102, and the barrier structure 22 projects in a direction perpendicular to the underside of the single cell 102. The structural plate 101 is a liquid cooling plate with a liquid cooling channel. The liquid cooling channel has a preferred dimension range in the height direction according to the specific cooling requirement, which means that the liquid cooling plate also has a preferred dimension range in the thickness direction. If the height by which the barrier structure 22 projects beyond the first insulating plate 21 is less than 3 mm, the dimension by which the barrier structure 22 projects into the outlet opening 1011 is too small, which is detrimental to the arc prevention effect.If the height by which the barrier structure 22 projects above the first insulating plate 21 exceeds 10 mm, the distance by which the barrier structure 22 projects above the liquid cooling plate becomes too large, negatively affecting the mounting of the battery pack 10. Therefore, the height by which the barrier structure 22 projects above the first insulating plate 21 can be adjusted to height values ​​such as 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm.

[0029] Furthermore, with reference to Fig. 10, the base plate has a predetermined breaking point, the breaking point being arranged sealingly at one end of the barrier structure 22, which is near the individual cell 102, and the breaking point being capable of bursting under a preset pressure and forming a through-opening. If a thermal passage occurs in one of the individual cells 102, its internal pressure gradually increases, and the explosion protection valve 1021 and the breaking point open successively under the influence of the internal pressure of the individual cell 102. After the high-temperature materials have flowed out following the opening of the pressure relief, they flow through the formed through-opening into the corresponding outlet opening 1011. However, during the flow process, there is a possibility that the high-temperature materials in the normal individual cell 102 may flow backward through the vent channel 220 and push against, squeeze, and exert back pressure on the explosion protection valve 1021 of the normal individual cell 102.At this point, due to the existence of the predetermined breaking point, the pressure exerted on the explosion protection valve 1021 of the normal single cell 102 by this backflow can be reduced, thus preventing the explosion protection valve 1021 of the normal single cell 102 from being opened by back pressure or from failing to open normally in the event of thermal lapse. It should be noted that the preset pressure can be appropriately preset based on the setpoint of the burst pressure of the explosion protection valve 1021 and the back pressure prevention setting. For example, the preset pressure should not be greater than the setpoint of the burst pressure of the explosion protection valve 1021 to prevent the pressure of the single cell 102 from being unable to be discharged, and it should not be too low, which would result in the loss of the back pressure prevention effect.At the same time, the predetermined breaking point, in its unbroken state, can insulate the backward-flowing high-temperature materials from the normal single cell 102 and achieve a good thermal insulation effect, thereby further preventing the normal single cell 102 from being affected by the high temperature.

[0030] Optionally, in some embodiments, the predetermined breaking point can be formed directly in the first insulating plate 21 by means of a notch. Furthermore, the first insulating plate 21 can incorporate a structural element made of mica material or a structural element doped with mica material. The mica material exhibits optimized thermal insulation performance, which can further reduce the high-temperature influence of the high-temperature materials on the normal single cell 102.

[0031] With reference to Fig. In the present embodiment, the base plate 10 further comprises a second insulating plate 23. The second insulating plate 23 is arranged between the underside of the single cell 102 and the first insulating plate 21. The second insulating plate 23 is provided with a similar notch to form the aforementioned predetermined breaking point. Optionally, the second insulating plate 23 uses a mica plate. The mica plate has a small thickness and excellent thermal insulation properties. It can burst under suitable pressure without a notch. Therefore, by appropriately controlling the thickness of the mica plate, both the requirement of bursting under suitable pressure and the requirement of reducing the back pressure exerted on the explosion protection valve 1021, as well as the high-temperature influence on the normal single cell 102, can be met.Of course, in some other embodiments, the second insulating plate 23 can also be a plate-shaped part, a foil-shaped part, etc., doped with a thermal insulation material such as mica. The present utility model is not limited in this respect.

[0032] In the present embodiment, an adhesive layer 24 is specifically arranged between the second insulating plate 23 and the underside of the individual cell 102, and an adhesive layer 24 is also arranged between the second insulating plate 23 and the first insulating plate 21, thereby achieving a firm and sealing connection between the individual cell 102, the second insulating plate 23, and the first insulating plate 21. The first insulating plate 21 and the barrier structure 22 are formed in one piece and are preferably manufactured by a prepreg compression molding process. In the prepreg compression molding process, mica powder can be doped into the first insulating plate 21 and the barrier structure 22, thereby also giving the first insulating plate 21 and the barrier structure 22 a thermal insulation effect, which better prevents heat transfer within the battery pack 10.At the same time, the fiber-reinforced material (such as carbon fiber or glass fiber) formed by the prepreg compression molding (PCM) process exhibits high strength and low weight, which takes into account lightweight construction, structural strength, and fire protection performance, and increases the structural strength of the entire battery pack. Optionally, an adhesive layer 24 is also arranged between the first insulating plate 21 and the aforementioned structural plate 101, thereby bonding and sealing the first insulating plate 21 and the structural plate 101 together.

[0033] Furthermore, in the present embodiment, the thickness of the second insulating plate 23 is 0.2 mm. Its upper surface is bonded or compressed to the underside of the single cell 102, and its underside is bonded to the first insulating plate 21 by an adhesive layer 24 with a thickness of 0.2 mm, formed by double-sided adhesive tape or structural adhesive. The first insulating plate 21 has a thickness of 1 mm and is bonded to the structural plate 101 by an adhesive layer 24 with a thickness of 0.2 mm, formed by double-sided adhesive tape or structural adhesive. At the same time, with reference to Fig.11, the surface of the liquid cooling plate is provided with a thermally conductive adhesive area 1012. This area is provided with a thermally conductive adhesive layer 24 with a thickness of 1.6 mm, formed by thermally conductive adhesive, which can firmly connect the single cell 102 and the liquid cooling plate, thus facilitating efficient heat exchange between the single cell 102 and the liquid cooling plate, and simultaneously exerts a total compression of 0.2 mm on the aforementioned multiple adhesive layers 24, thereby ensuring the adhesive strength on both sides of the multiple adhesive layers 24.

[0034] During the assembly of the battery pack 10 provided in the present embodiment, the second insulating plate 23 and the first insulating plate 21 can first be successively glued to the underside of the individual cell 102, and then the individual cell 102 can be mounted on the liquid cooling plate to prevent the structural adhesive from flowing to the explosion protection valve 1021 and to ensure a sufficient adhesive area elsewhere. Furthermore, in the initial phase of a thermal cycle in the individual cell 102, particularly before the explosion protection valve 1021 opens, the first insulating plate 21 can block the flow of the molten thermally conductive adhesive to the explosion protection valve 1021, thereby ensuring that the explosion protection valve 1021 can burst under the preset burst pressure.

[0035] In this description, reference to the terms "some embodiments," "other embodiments," etc., means that the specific property, structure, material, or feature described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this description, the exemplary representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific properties, structures, materials, or features may be combined appropriately in each or more embodiments or examples.

[0036] Obviously, the aforementioned embodiments of the present utility model serve only to clearly illustrate the present utility model by way of example and do not constitute a limitation of the embodiments of the present utility model. For a person skilled in the art, various obvious modifications, rearrangements, and substitutions can be made without deviating from the scope of protection of the present utility model. It is neither necessary nor possible here to list all embodiments exhaustively. Any modification, equivalent substitution, and improvement made within the spirit and principles of the present utility model should be included in the scope of protection of the claims of the present utility model.

[0037] This utility model relates to the technical field of battery packs and discloses a battery pack. The battery pack comprises at least two individual cells and a base plate. The base plate supports the individual cells, one side of each individual cell facing the base plate being provided with an explosion protection valve. The base plate has a barrier structure, and this barrier structure forms a vent channel, wherein the orthogonal projection of the explosion protection valve onto the underside of the individual cells and the orthogonal projection of the vent channel onto the underside of the individual cells at least partially overlap. After the explosion protection valve has been opened, the high-temperature materials (gases, liquids, etc.) flowing out of the pressure relief opening can be discharged via the vent channel.At the same time, the barrier structure can guide and block the high-temperature materials discharged via the explosion protection valve, so that the high-temperature materials, after flowing out of the pressure relief opening, flow in the specified direction and flow path, preventing disturbance of the surrounding normal single cells and thus achieving the effect of limiting thermal propagation.

Claims

[1] Battery pack, characterized by , that the battery pack (10) comprises the following: at least two single cells (102); a base plate which supports the individual cells (102), wherein one side of the individual cells (102) facing the base plate is provided with an explosion protection valve (1021), wherein the base plate has a barrier structure (22), wherein the barrier structure (22) forms a vent channel (220), wherein the orthogonal projection of the explosion protection valve (1021) onto the underside of the individual cells (102) and the orthogonal projection of the vent channel (220) onto the underside of the individual cells (102) overlap at least partially. [2] Battery pack according to claim 1, characterized by, that the base plate comprises a first insulating plate (21) and a structural plate (101), wherein the first insulating plate (21) is located between the structural plate (101) and the single cell (102), wherein the barrier structure (22) is arranged on the first insulating plate (21), wherein the structural plate (101) has an outlet opening (1011), and wherein the structural plate (101) is arranged on the side of the single cell (102) on which the explosion protection valve (1021) is arranged, and wherein the orthogonal projection of the vent channel (220) onto the underside of the single cell (102) and the orthogonal projection of the outlet opening (1011) onto the underside of the single cell (102) overlap at least partially. [3] Battery pack according to claim 2, characterized by, that in the direction from the single cell (102) to the structural plate (101) the barrier structure (22) is arranged projecting beyond the side of the first insulating plate (21) facing away from the single cell (102), wherein at least a part of the barrier structure (22) is inserted into the outlet opening (1011). [4] Battery pack according to claim 3, characterized by , that in the direction from the single cell (102) to the structure plate (101) the end of the barrier structure (22) facing away from the single cell (102) and the surface of the structure plate (101) facing away from the single cell (102) are arranged flush. [5] Battery pack according to claim 3, characterized by , that in the direction from the single cell (102) to the structure plate (101) the end of the barrier structure (22) facing away from the single cell (102) is arranged to project beyond the structure plate (101), wherein the overhang height H is not less than 0.2 mm and not greater than 5 mm. [6] Battery pack according to claim 2, characterized by, that the height by which the barrier structure (22) extends beyond the first insulating plate (21) is not less than 3 mm and not greater than 10 mm. [7] Battery pack according to claim 1, characterized by , that the flow cross-section of the vent channel (220) is S1 and the notch area of ​​the explosion protection valve (1021) is S2, where S1 and S2 satisfy the relationship 1 ≤ S1 / S2 ≤ 6. [8] Battery pack according to claim 7, characterized by , that the flow cross-section S1 of the vent channel (220) has the relationship 80 mm 2 ≤ S1 ≤ 4,000 mm 2 fulfilled, and the notch surface S2 of the explosion protection valve (1021) the relationship 80 mm 2 ≤ S2 ≤ 1,400 mm 2 fulfilled. [9] Battery pack according to claim 2, characterized bythat the base plate has a predetermined breaking point, wherein the predetermined breaking point is arranged sealingly at one end of the barrier structure (22) facing the single cell (102), wherein the predetermined breaking point can burst at preset pressure and form a through-opening that passes through the base plate. [10] Battery pack according to claim 9, characterized by , that the first insulating plate (21) has the predetermined breaking point; or the base plate comprises a second insulating plate (23), wherein the second insulating plate (23) is arranged between the underside of the single cell (102) and the first insulating plate (21) and the second insulating plate (23) has the predetermined breaking point. [11] Battery pack according to claim 1, characterized by , that the barrier structure (22) is made of insulating material.

Images