Battery pack

Abstract

The utility model belongs to the technical field of battery packs, and discloses a battery pack. The battery pack comprises at least two single batteries and a bottom plate, the bottom plate supports the single batteries, an anti-explosion valve is arranged on the face, facing the bottom plate, of each single battery, the bottom plate is provided with a blocking structure, an exhaust channel is formed in the blocking structure, and the orthographic projection of the anti-explosion valve on the bottom face of each single battery and the orthographic projection of the exhaust channel on the bottom face of each single battery at least partially coincide. After the anti-explosion valve is opened, gas, liquid and other high-temperature substances flowing out of the pressure relief opening can be exhausted through the exhaust channel. Meanwhile, the blocking structure can guide and block the high-temperature substances discharged by the explosion-proof valve, so that the high-temperature substances flow according to a preset direction and path after flowing out of the pressure relief opening, interference to surrounding normal single batteries is avoided, and the effect of limiting the thermal runaway propagation phenomenon is achieved.

Description

Technical Field

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

[0002] Thermal runaway propagation refers to the phenomenon where a single cell in a battery pack experiences thermal runaway due to misuse (such as mechanical damage, overcharging, or high temperature), which then triggers thermal runaway in adjacent or other normal cells, leading to a chain reaction.

[0003] In existing technologies, most methods employ the placement of thermal insulation materials between adjacent individual cells to prevent and slow the rapid spread of heat between the thermally runaway cell and adjacent normal cells, thereby limiting the propagation of thermal runaway. However, this approach has limited effectiveness in restricting thermal runaway propagation. Especially after the cell's explosion-proof valve opens, high-temperature substances such as electrolyte and internal gases flow out of the cell and into the battery pack. Adjacent normal cells come into direct contact with these high-temperature substances, causing a rapid increase in local temperature and making them prone to thermal runaway propagation.

[0004] Therefore, there is an urgent need for a battery pack to solve the aforementioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a battery pack that has the ability to limit the spread of thermal runaway.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The battery pack includes at least two individual cells and a base plate. The base plate supports the individual cells. An explosion-proof valve is provided on the side of the individual cell facing the base plate. The base plate is provided with a blocking structure, which forms an exhaust channel. The orthographic projection of the explosion-proof valve on the bottom surface of the individual cell and the orthographic projection of the exhaust channel on the bottom surface of the individual cell at least partially overlap.

[0008] The beneficial effects of this battery pack are as follows: The bottom plate is equipped with a blocking structure, which is located near the bottom of the individual battery cells and forms an exhaust channel. After the explosion-proof valve is opened, high-temperature substances such as gas and liquid flowing out of the pressure relief port can be discharged through the exhaust channel. Simultaneously, the orthographic projection of the explosion-proof valve on the bottom surface of the individual battery cell and the orthographic projection of the exhaust channel on the bottom surface of the individual battery cell at least partially overlap. This allows the exhaust channel to connect with the pressure relief port, enabling the blocking structure to guide and block the high-temperature substances discharged through the explosion-proof valve. This ensures that the high-temperature substances flow in a predetermined direction and path after exiting the pressure relief port, preventing interference with surrounding normal individual batteries and thus limiting the propagation of thermal runaway. Attached Figure Description

[0009] Figure 1 This is a partially exploded view of the battery pack provided by this utility model;

[0010] Figure 2 This is a schematic diagram showing the arrangement of some individual cells in the battery pack;

[0011] Figure 3 This is a three-dimensional structural view of a base plate in this utility model;

[0012] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0013] Figure 5 It is a bottom view of the assembly of a single battery cell and the base plate;

[0014] Figure 6 It is along Figure 5 Cross-sectional view along the BB direction;

[0015] Figure 7 It is a top view of the assembly of individual cells and base plates mounted on the structural plate;

[0016] Figure 8 It is along Figure 7 A cross-sectional view along the CC direction;

[0017] Figure 9 yes Figure 8 A magnified view of a section at point D;

[0018] Figure 10 yes Figure 9 A magnified view of a section at point E in the middle;

[0019] Figure 11 This is a schematic diagram showing the location of the thermally conductive adhesive bonding area on the structural panel.

[0020] In the picture:

[0021] 10. Battery pack; 101. Structural plate; 1011. Drain outlet; 1012. Thermally conductive adhesive bonding area; 102. Individual cell; 1021. Explosion-proof valve;

[0022] 21. First insulating plate; 22. Barrier structure; 220. Exhaust channel; 23. Second insulating plate; 24. Adhesive layer. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] The following is based on the appendix Figure 1 To be continued Figure 11 The present invention introduces the battery pack 10 provided by this utility model.

[0028] like Figures 1 to 3 As shown, the battery pack 10 includes a base plate and at least two individual batteries 102 arranged in a row, with the base plate supporting the individual batteries. Each individual battery 102 has an explosion-proof valve 1021 on its bottom surface, facing the base plate. When a single battery 102 experiences thermal runaway, the explosion-proof valve 1021 on its bottom surface opens under internal pressure, forming a pressure relief port. The high-temperature material inside the individual battery 102 then flows out through the pressure relief port, thus preventing the individual battery 102 from exploding due to excessive internal pressure.

[0029] However, after the high-temperature material flows out of the pressure relief port, it tends to diffuse due to the pressure. In particular, the high-temperature gas easily transfers heat to the adjacent normal single-cell batteries 102, causing them to malfunction due to the high temperature. To address this, the base plate is also equipped with a blocking structure 22, which is located near the bottom of the single-cell battery 102 and forms an exhaust channel 220. The exhaust function of this exhaust channel 220 means that after the explosion-proof valve 1021 is opened, the high-temperature materials such as gas and liquid flowing out of the pressure relief port can be discharged through the exhaust channel 220. Meanwhile, the orthographic projection of the explosion-proof valve 1021 on the bottom surface of the single cell 102 and the orthographic projection of the exhaust channel 220 on the bottom surface of the single cell 102 at least partially overlap. This allows the exhaust channel 220 to connect with the pressure relief port, thereby enabling the blocking structure 22 to guide and block the high-temperature material discharged through the explosion-proof valve 1021. This allows the high-temperature material to flow in a preset direction and path after flowing out of the pressure relief port, avoiding interference with the surrounding normal single cells 102, thus limiting the propagation of thermal runaway.

[0030] Specifically, such as Figure 3 , 4 As shown, the base plate includes a first insulating plate 21 and a structural plate 101. The structural plate 101 is mainly used for load-bearing and impact protection, and is therefore preferably made of metal. The first insulating plate 21 is used to prevent short circuits between the structural plate 101 and the individual battery 102, and is therefore preferably made of insulating material, and is disposed between the structural plate 101 and the individual battery 102. The blocking structure 22 is disposed on the side of the first insulating plate 21 away from the individual battery 102, and protrudes along the direction from the individual battery 102 to the structural plate 101 (as indicated by the X arrow in the figure). In this embodiment, along the direction from the individual battery 102 to the structural plate 101, the blocking structure 22 has an inner contour with a closed shape such as an ellipse or a waist shape, which can form an exhaust channel 220. The exhaust channel 220 can allow high-temperature substances to pass through, and the blocking structure 22 can restrict the direction and path of the high-temperature substances when passing through the exhaust channel 220. After the explosion-proof valve 1021 ruptures, the high-temperature material can directly enter the exhaust channel 220, preventing the high-temperature material from flowing uncontrollably through the gap that may be formed between the base plate and the bottom surface of the single cell 102.

[0031] Optionally, the surface of the base plate facing the individual battery 102 can be sealed to the bottom surface of the individual battery 102. Exemplarily, in some embodiments, a sealant layer is provided between the first insulating plate 21 and the bottom surface of the individual battery 102. This sealant layer serves both to bond the first insulating plate 21 and the bottom surface of the individual battery 102, and to eliminate gaps between them, thereby preventing high-temperature substances from flowing through the gaps and negatively impacting other normal individual batteries 102. It should be noted that the relative positions of the base plate and the individual battery 102 in specific use are not limited in this invention. Any plate that is located on the side of the individual battery 102 where the explosion-proof valve 1021 is located and has the aforementioned blocking structure 22 can be defined as the base plate or part of the base plate to be protected by this invention.

[0032] like Figure 5 , Figure 6 As shown, the orthographic projection of the exhaust channel 220 on the bottom surface of the single cell 102 (i.e., the projection along the direction perpendicular to the bottom surface of the single cell 102, refer to the direction indicated by the Y arrow) and the orthographic projection of the explosion-proof valve 1021 on the bottom surface of the single cell 102 are at least partially overlapped. That is, the two orthographic projections can be completely overlapped, partially overlapped, or one orthographic projection can be completely contained by the other orthographic projection. This allows the exhaust channel 220 and the pressure relief port to be connected when the base plate is installed in the battery pack 10 and the explosion-proof valve 1021 is opened to form a pressure relief port. That is, after the high-temperature material flows out of the pressure relief port, it can flow smoothly into the corresponding exhaust channel 220. When high-temperature material flows into the exhaust channel 220, the inner wall of the exhaust channel 220 can guide the high-temperature material, preventing it from flowing in a direction parallel to the bottom surface of the single cell 102, or from flowing directly diffusely at the explosion-proof valve 1021. This prevents the high-temperature material from having a negative impact on adjacent single cells 102 due to a change in flow direction after leaving the pressure relief port, thus limiting the propagation of thermal runaway.

[0033] Optionally, refer to Figure 3 , Figure 4As shown, the height of the barrier structure 22 protruding from the first insulating plate 21 is not less than 3mm and not more than 10mm. For example, this height can be set to 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. When the height of the barrier structure 22 protruding from the first insulating plate 21 is less than 3mm, the length of the exhaust channel 220 will be shorter, resulting in weaker constraint on high-temperature materials, especially insufficient constraint on diffusing flow. When the height of the barrier structure 22 protruding from the first insulating plate 21 is greater than 10mm, the barrier structure 22 will occupy a large space within the battery pack 10, reducing the space utilization rate within the battery pack 10.

[0034] Preferably, refer to Figure 2 , Figure 3 and Figure 6 As shown, the flow area of ​​the exhaust channel 220 is S1, and the indentation area of ​​the explosion-proof valve 1021 is S2, and S1 and S2 satisfy: 1≤S1 / S2≤6. When S1 / S2 is less than 1, for example, 0.5, the flow capacity of the exhaust channel 220 is poor, which negatively affects the outflow of high-temperature substances. When S1 / S2 is greater than 6, for example, 7 or 7.5, the ability of the blocking structure 22 to restrict high-temperature substances decreases, making it easier for other parts of the battery pack 10 to be affected during an explosion. Therefore, in some embodiments, S1 and S2 can be set to satisfy a proportional relationship of 1, 2, 3, 4, 5, 6, that is, the value of S1 / S2 can be 1, 2, 3, 4, 5, 6, or 1.5, 2.4, etc.

[0035] Specifically, the flow area S1 of the exhaust channel 220 refers to the cross-sectional area or average cross-sectional area within the exhaust channel 220 along a direction perpendicular to the flow path of the high-temperature material. For example, in this embodiment, referring to... Figure 6 As shown, the high-temperature material along Figure 6 The X arrow in the diagram indicates that the flow passes through the exhaust channel 220. The exhaust channel 220 is a cylindrical space with its axis in the vertical direction. Its cross-section consists of waist-shaped regions with equal areas. According to the definition of the flow area S1, its cross-sectional area in the horizontal direction (i.e., the area of ​​the waist-shaped region) is defined as the flow area S1.

[0036] More preferably, the grooved area S2 of the explosion-proof valve 1021 is not less than 80 mm. 2 and not greater than 1400mm 2 This ensures that the pressure relief requirement of the individual battery is met, guaranteeing that the explosion-proof valve 1021 can achieve sufficient pressure relief when thermal runaway occurs in the individual battery 102. For example, in some embodiments, the groove area S2 of the explosion-proof valve 1021 can be set to 80 mm². 2 100mm 2140mm 2 300mm 2 650mm 2 1300mm 2 Equal area size. Optionally, the flow area S1 of the exhaust channel 220 satisfies 80mm². 2 ≤S1≤4000mm 2 For example, set to 80mm 2 300mm 2 900mm 2 1800mm 2 2900mm 2 3900mm 2 The equal area ensures that the exhaust channel 220 has suitable exhaust capacity without negatively impacting the structural strength and protective performance of the base plate. Of course, to balance the flow capacity of the exhaust channel 220 with its ability to confine high-temperature substances, achieving a better thermal runaway limitation effect, it is also necessary to coordinate with the notched area S2 of the explosion-proof valve 1021, setting the flow area S1 of the exhaust channel 220 according to the aforementioned ratio of 1≤S1 / S2≤6.

[0037] like Figures 7 to 8 As shown, in this embodiment, the battery pack 10 further includes a structural plate 101. The structural plate 101 is disposed on the side of the individual battery 102 where the explosion-proof valve 1021 is located and has a discharge port 1011. The discharge port 1011 is used to discharge high-temperature substances flowing out of the pressure relief port from the battery pack 10. Figure 9 As shown, the orthographic projection of the exhaust channel 220 on the bottom surface of the single cell 102 and the orthographic projection of the outlet 1011 on the bottom surface of the single cell 102 at least partially overlap, thereby enabling the outlet 1011 and the exhaust channel 220 to communicate, ensuring that high-temperature materials can flow out of the battery pack 10 through the outlet 1011 after passing through the exhaust channel 220.

[0038] Preferably, in this embodiment, the blocking structure 22 is made of insulating material, which can prevent the conductive material discharged through the exhaust channel 220 from making electrical connections with adjacent structures, thus avoiding short circuits and arcing. Further, at least a portion of the blocking structure 22 is inserted into the outlet 1011 along the direction from the individual cell 102 to the structural plate 101. In most battery packs 10, the structural plate 101 is generally made of metal, and to prevent short circuit risks, an insulating coating is usually provided on the surface of the structural plate 101. However, during the production process of the structural plate 101, due to the difficulty in setting the insulating coating on the inner wall of the outlet 1011, the insulation performance of the insulating coating on the inner wall of the outlet 1011 often fails to meet standards, or the insulating coating is not firmly bonded. When the individual cell 102 experiences thermal runaway, the conductive material (especially the electrolyte) flowing out through the outlet 1011 is prone to arcing with the structural plate 101, leading to combustion and potentially causing runaway of adjacent cells.

[0039] In this embodiment, since the blocking structure 22 is made of insulating material and at least a portion of the blocking structure 22 is inserted into the outlet 1011, it can insulate and space the conductive substances such as electrolyte from at least a portion of the inner wall of the outlet 1011, thereby reducing the phenomenon of arcing and limiting the propagation of thermal runaway.

[0040] Preferably, in some embodiments, the blocking structure 22 is at least flush with the outlet 1011 along the direction from the individual cell 102 to the structural plate 101. That is, the blocking structure 22 can be flush with the outlet 1011 or it can completely pass through and protrude from the outlet 1011. Exemplarily, along the direction from the individual cell 102 to the structural plate 101, the end of the blocking structure 22 away from the individual cell 102 and the surface of the structural plate 101 away from the individual cell 102 are flush, thereby ensuring that the blocking structure 22 is insulatingly disposed between the conductive material and the structural plate 101 during the flow of conductive materials such as electrolyte through the exhaust channel 220.

[0041] Of course, for reference Figure 10As shown, the blocking structure 22 can also protrude from the end of the structural plate 101 away from the individual battery 102 along the direction from the individual battery 102 to the structural plate 101. This can better isolate the conductive material from the structural plate 101 and further extend the length of the exhaust channel 220, thus better constraining the flow direction. More preferably, the protrusion distance H is not less than 0.2 mm and not more than 5 mm, so as to achieve a good isolation effect while avoiding the negative impact on the installation of the battery pack 10 if the protrusion distance H is too large. Exemplarily, in some embodiments, the protrusion distance H can be set to 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0042] More specifically, in this embodiment, the first insulating plate 21 is arranged parallel to the bottom surface of the single cell 102, and the blocking structure 22 protrudes in a direction perpendicular to the bottom surface of the single cell 102. The structural plate 101 is a liquid-cooled plate, which has liquid-cooling channels. The liquid-cooling channels have a preferred size range in the height direction according to specific heat dissipation requirements, which results in the liquid-cooled plate also having a preferred size range in the thickness direction. When the height of the blocking structure 22 protruding from the first insulating plate 21 is less than 3mm, the size of the blocking structure 22 extending into the outlet 1011 will be too small, which is not conducive to preventing arcing. When the height of the blocking structure 22 protruding from the first insulating plate 21 is greater than 10mm, the distance of the blocking structure 22 protruding from the liquid-cooled plate will be too large, which will have a negative impact on the installation of the battery pack 10. Therefore, the height of the blocking structure 22 protruding from the first insulating plate 21 can be set to 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0043] Continue to refer to Figure 10As shown, the base plate has a rupture section, which is sealed at one end of the blocking structure 22 near the single cell 102. The rupture section can rupture under a preset pressure, forming an opening. When one of the single cells 102 experiences thermal runaway, its internal pressure gradually increases, and the explosion-proof valve 1021 and the rupture section open sequentially under the pressure inside the single cell 102. After the high-temperature material flows out through the opened pressure relief, it flows into the corresponding discharge port 1011 through the formed opening. However, during the flow, at the normal single cell 102, there is a possibility that the high-temperature material may flow in reverse through the exhaust channel 220, impacting and squeezing the explosion-proof valve 1021 of the normal single cell 102, applying reverse pressure. At this time, due to the presence of the rupture section, the pressure applied to the explosion-proof valve 1021 of the normal single cell 102 by this reverse flow can be reduced, thereby preventing the explosion-proof valve 1021 of the normal single cell 102 from being opened in reverse or failing to open normally during thermal runaway. It should be noted that this preset pressure can be reasonably preset based on the burst pressure setting value of the explosion-proof valve 1021 and the setting for preventing reverse pressure. For example, the preset pressure should not exceed the burst pressure setting value of the explosion-proof valve 1021 to avoid the pressure of the individual battery 102 being unable to be discharged, and it should not be too low, resulting in the loss of the effect of preventing reverse pressure. At the same time, the rupture section can also isolate the reverse-flowing high-temperature material from the normal individual battery 102 when it is not ruptured, achieving a good heat insulation effect, thereby further preventing the normal individual battery 102 from being affected by high temperature.

[0044] Optionally, in some embodiments, grooves can be directly formed on the first insulating plate 21 to create a crack. Furthermore, the first insulating plate 21 can be a structural component made of mica material, or a structural component doped with mica material. Mica material has superior heat insulation properties, which can further reduce the high-temperature impact of high-temperature substances on the normal single-cell battery 102.

[0045] like Figure 10 As shown, in this embodiment, the base plate further includes a second insulating plate 23, which is disposed between the bottom surface of the single cell 102 and the first insulating plate 21. The second insulating plate 23 has similar grooves to form the aforementioned crack. Optionally, the second insulating plate 23 is made of mica. Mica is thin and has excellent heat insulation properties. It can break under appropriate pressure without the need for grooves. Therefore, by reasonably controlling the thickness of the mica plate, the requirement of breaking under appropriate pressure can be met, as well as the requirement of reducing the reverse pressure on the explosion-proof valve 1021, and further reducing the high temperature impact on the normal single cell 102. Of course, in some other embodiments, the second insulating plate 23 can also be a plate-shaped piece, sheet-shaped piece, etc., doped with heat insulation materials such as mica. This utility model does not specifically limit this.

[0046] More specifically, in this embodiment, an adhesive layer 24 is provided between the second insulating plate 23 and the bottom surface of the single battery cell 102, and an adhesive layer 24 is also provided between the second insulating plate 23 and the first insulating plate 21, thereby achieving a fixed and sealed connection between the single battery cell 102, the second insulating plate 23, and the first insulating plate 21. The first insulating plate 21 and the barrier structure 22 are integrally formed, and preferably manufactured by a prepreg compression molding process. In the prepreg compression molding process, mica powder can be incorporated into the first insulating plate 21 and the barrier structure 22, thereby giving the first insulating plate 21 and the barrier structure 22 a heat insulation effect, better preventing 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 process has high strength and low weight, which can balance lightweight, structural strength, and fire resistance, improving the structural strength of the entire battery pack. Optionally, an adhesive layer 24 is also provided between the first insulating plate 21 and the aforementioned structural plate 101, thereby bonding and fixing the first insulating plate 21 and the structural plate 101 together and sealing them together.

[0047] More specifically, in this embodiment, the second insulating plate 23 has a thickness of 0.2 mm. Its upper side is bonded to or pressed against the bottom surface of the single battery cell 102, and its lower side is bonded to the first insulating plate 21 through an adhesive layer 24 with a thickness of 0.2 mm formed by double-sided adhesive or structural adhesive. The first insulating plate 21 has a thickness of 1 mm and is bonded to the structural plate 101 through an adhesive layer 24 with a thickness of 0.2 mm formed by double-sided adhesive or structural adhesive. Meanwhile, as... Figure 11 As shown, the surface of the liquid cooling plate is provided with a thermally conductive adhesive bonding area 1012. This area is provided with a thermally conductive adhesive layer 24 with a thickness of 1.6mm formed by thermally conductive adhesive, which can fix the single cell 102 and the liquid cooling plate to a fixed connection, facilitating efficient heat exchange between the single cell 102 and the liquid cooling plate. At the same time, it also forms a total compression of 0.2mm on the multiple adhesive layers 24, thereby ensuring that the adhesion on both sides of the multiple adhesive layers 24 is firm.

[0048] When assembling the battery pack 10 provided in this embodiment, the second insulating plate 23 and the first insulating plate 21 can be sequentially bonded to the bottom surface of the individual battery 102, and then the individual battery 102 can be installed on the liquid cooling plate to prevent the structural adhesive from flowing to the explosion-proof valve 1021 and to ensure that the adhesive area in other positions is sufficient. Furthermore, in the initial stage of thermal runaway of the individual battery 102, especially before the explosion-proof valve 1021 opens, the first insulating plate 21 can prevent the molten thermally conductive adhesive from flowing to the explosion-proof valve 1021, thereby ensuring that the explosion-proof valve 1021 can explode under the preset burst pressure.

[0049] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized by, The battery pack (10) includes: At least two individual cells (102); A base plate supports the single battery cell (102). An explosion-proof valve (1021) is provided on the side of the single battery cell (102) facing the base plate. The base plate is provided with a blocking structure (22), and the blocking structure (22) forms an exhaust channel (220). The orthographic projection of the explosion-proof valve (1021) on the bottom surface of the single battery cell (102) and the orthographic projection of the exhaust channel (220) on the bottom surface of the single battery cell (102) at least partially overlap.

2. The battery pack according to claim 1, characterized in that, The base plate includes a first insulating plate (21) and a structural plate (101). The first insulating plate (21) is located between the structural plate (101) and the single cell (102). The blocking structure (22) is disposed on the first insulating plate (21). The structural plate (101) is provided with an outlet (1011). The structural plate (101) is disposed on the side of the single cell (102) where the explosion-proof valve (1021) is provided. Furthermore, the orthographic projection of the exhaust channel (220) on the bottom surface of the single cell (102) and the orthographic projection of the outlet (1011) on the bottom surface of the single cell (102) at least partially overlap.

3. The battery pack according to claim 2, characterized in that, Along the direction from the single cell (102) to the structural plate (101), the blocking structure (22) protrudes from the first insulating plate (21) on the side away from the single cell (102), and at least a portion of the blocking structure (22) is inserted into the outlet (1011).

4. The battery pack according to claim 3, characterized in that, Along the direction from the single cell (102) to the structural plate (101), the blocking structure (22) is flush with the end of the single cell (102) away from the single cell (102) and the surface of the structural plate (101) away from the single cell (102).

5. The battery pack according to claim 3, characterized in that, Along the direction from the single cell (102) to the structural plate (101), the blocking structure (22) is provided with its end away from the single cell (102) protruding from the structural plate (101) with a protrusion distance H of not less than 0.2 mm and not more than 5 mm.

6. The battery pack according to claim 2, characterized in that, The height of the blocking structure (22) protruding from the first insulating plate (21) is not less than 3 mm and not more than 10 mm.

7. The battery pack according to claim 1, characterized in that, The flow area of ​​the exhaust channel (220) is S1, and the etched area of ​​the explosion-proof valve (1021) is S2, and S1 and S2 satisfy: 1≤S1 / S2≤6.

8. The battery pack according to claim 7, characterized in that, The flow area S1 of the exhaust channel (220) satisfies 80mm. 2 ≤S1≤4000mm 2 Furthermore, the etched area S2 of the explosion-proof valve (1021) satisfies 80mm. 2 ≤S2≤1400mm 2 .

9. The battery pack according to claim 2, characterized in that, The base plate has a fracture portion, which is sealed at one end of the blocking structure (22) near the single cell (102). The fracture portion can rupture under a preset pressure and form a through opening through the base plate.

10. The battery pack according to claim 9, characterized in that, The first insulating plate (21) is provided with the rupture portion; or, The base plate includes a second insulating plate (23), which is disposed between the bottom surface of the single cell (102) and the first insulating plate (21), and the second insulating plate (23) is provided with the rupture portion.

11. The battery pack according to claim 1, characterized in that, The barrier structure (22) is made of insulating material.

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