Battery pack and battery device

Abstract

The utility model discloses a kind of battery pack and battery device, including box, first partition and second partition, box includes bottom plate and frame, bottom plate and frame are enclosed into containing cavity, containing cavity includes battery compartment and electrical compartment, battery compartment is separatedly arranged with electrical compartment by first partition, battery compartment at least includes two adjacent setting sub battery compartment, adjacent setting sub battery compartment is separatedly arranged by second partition;Through part for the conductive part of sub battery compartment is set on first partition and is led to electrical compartment, conductive part is sealingly connected with through part, the interval distance Lmm of conductive part and second partition along first direction is 2~20mm;First partition includes first surface and second surface, second partition is close to the end of electrical compartment, and it does not exceed second surface.The battery pack and battery device of the utility model avoid that the battery group in one sub battery compartment affects the battery group in other compartment when thermal runaway, improve the safety performance of battery pack.

Description

Technical Field

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

[0002] Electric vehicles typically contain battery packs that provide power to the vehicle. Within a battery pack, multiple battery cells are arranged as independent battery clusters, which can be connected in series or parallel. However, in the event of thermal runaway within the battery pack, adjacent battery cells can interfere with each other. That is, thermal runaway in one battery cell can affect the operation of another, preventing both cells from starting properly and compromising the safety of the battery pack. Utility Model Content

[0003] In view of this, the present invention provides a battery pack and battery device that avoids the impact of thermal runaway of a battery pack in one sub-battery compartment on the battery packs in other compartments, thereby improving the safety performance of the battery pack.

[0004] To achieve the above objectives, in a first aspect, this utility model provides the following technical solution:

[0005] A battery pack includes a housing, a first partition plate, and a second partition plate. The housing includes a bottom plate and a frame connected to the surface of the bottom plate. The bottom plate and the frame form a receiving cavity. The receiving cavity includes a battery compartment and an electrical compartment. The battery compartment and the electrical compartment are separated by the first partition plate. The battery compartment includes at least two adjacent sub-battery compartments. The adjacent sub-battery compartments are separated by the second partition plate, and each sub-battery compartment is independently sealed. The first partition plate and the second partition plate are sealed and fixedly connected. A conductive element for the sub-battery compartment is provided on the first partition plate, leading out to a through portion of the electrical compartment. The conductive element is sealed and connected to the through portion. The distance Lmm between the conductive element and the second partition plate along a first direction is in the range of 2~20mm. The first direction is the length direction of the first partition plate.

[0006] Along the second direction, the first partition includes a first surface and a second surface disposed opposite to each other, the first surface being disposed close to the battery compartment and the second surface being disposed away from the battery compartment, and along the second direction, the end of the second partition near the electrical compartment does not extend beyond the second surface;

[0007] The second direction is the length direction of the second partition plate, and the first direction is perpendicular to the second direction.

[0008] As can be seen from the above technical solution, the battery pack provided by this utility model divides the cavity formed by the base plate and the frame into a battery compartment and an electrical compartment by a first partition plate, preventing the components in the electrical compartment from being affected in the event of battery thermal runaway. The battery compartment is further divided into multiple sealed sub-battery compartments by a second partition plate, preventing the battery pack in one sub-battery compartment from experiencing thermal runaway and affecting the power supply of batteries in other sub-battery compartments. Battery packs in sub-battery compartments that have not experienced thermal runaway can still provide power normally, improving the safety performance of the battery pack. While ensuring that the end of the second partition plate near the electrical compartment does not extend beyond the first partition plate into the electrical compartment, thus guaranteeing installation space for electrical components in the electrical compartment, the distance Lmm between the conductive component and the second partition plate along the first direction reduces the risk of seal failure at the connection between the first and second partition plates and prevents the conductive component from being too long and affecting overcurrent. Simultaneously, the end of the second partition plate near the electrical compartment does not extend beyond the second surface, further ensuring the safety performance of the battery pack.

[0009] Secondly, this utility model also provides a battery device, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0010] The battery device of this utility model includes the battery pack described above, and therefore has the advantages of the battery pack described above, which will not be repeated here. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the battery pack from one angle provided in an embodiment of this utility model;

[0013] Figure 2 for Figure 1 A partially enlarged structural diagram of part A in the diagram;

[0014] Figure 3 This is a structural schematic diagram of the battery pack provided in an embodiment of the present invention from another angle;

[0015] Figure 4 for Figure 3 A partially enlarged structural diagram of part B in the diagram;

[0016] Figure 5 This is a schematic diagram of the structure of the box provided in an embodiment of the present utility model;

[0017] Figure 6This is a structural schematic diagram showing the connection position between the second partition plate and the first partition plate according to an embodiment of the present invention;

[0018] Figure 7 A structural schematic diagram showing an angle at the connection position between the second partition plate and the first partition plate, according to another embodiment of the present invention;

[0019] Figure 8 for Figure 7 Another structural diagram from a different angle;

[0020] Figure 9 A schematic diagram showing the area of ​​the through portion and the area of ​​the first surface of the first partition plate provided for an embodiment of this utility model;

[0021] Figure 10 A schematic diagram showing the structure of the second partition plate inserted into the first partition plate at an angle lower than the top surface of the first partition plate, according to an embodiment of the present utility model.

[0022] Figure 11 A schematic diagram showing the structure of the second partition plate inserted into the first partition plate at another angle below the top surface of the first partition plate, according to an embodiment of the present invention.

[0023] Figure 12 This is a structural schematic diagram of the connection position between a first partition plate and a second partition plate having a cavity, provided in an embodiment of the present invention;

[0024] Figure 13 A schematic diagram of the connection position between the first partition plate and the second partition plate having a cavity, provided for another embodiment of this utility model;

[0025] Figure 14 A schematic diagram of the connection position between the first partition plate and the second partition plate having a cavity, provided in the third embodiment of this utility model;

[0026] Figure 15 This is a structural schematic diagram of the connection position between the first partition plate and the second partition plate with a cavity, provided in the fourth embodiment of the present invention.

[0027] Figure 16 for Figure 15 Another structural diagram from a different angle;

[0028] Figure 17 This is a structural schematic diagram of the connection position between the first partition plate and the second partition plate with a cavity, provided in the fifth embodiment of the present utility model.

[0029] Figure 18 A schematic diagram of the connection position between the first partition plate and the second partition plate having a cavity, provided in the sixth embodiment of this utility model;

[0030] Figure 19 A schematic diagram of the through portion of the first partition plate provided in an embodiment of the present utility model;

[0031] Figure 20 for Figure 19 A schematic diagram of a structure in which a sealing element is provided in the through section;

[0032] Figure 21 A schematic diagram of the through portion of the first partition plate provided in another embodiment of the present utility model;

[0033] Figure 22 This is a schematic diagram of the connection structure between the conductive component and the sealing component provided in an embodiment of the present utility model.

[0034] in:

[0035] 1. Box body,

[0036] 101. Base plate; 102. Frame.

[0037] 2. First partition plate,

[0038] 201. Through section; 202. First surface; 203. Second surface; 204. First cavity plate; 205. Second cavity plate; 206. Cavity; 2061. Sub-cavity; 207. Reinforcing rib.

[0039] 3. Electrical warehouse,

[0040] 4. Conductive components,

[0041] 5. Battery cells,

[0042] 6. Second partition plate,

[0043] 7. Battery compartment

[0044] 701, Sub-battery compartment,

[0045] 8. Sealing components. Detailed Implementation

[0046] This utility model discloses a battery pack and battery device that prevents the battery pack in one sub-battery compartment from experiencing thermal runaway and affecting the battery packs in other compartments, thereby improving the safety performance of the battery pack.

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] A battery pack comprises a battery array consisting of multiple battery cells connected in series and / or parallel, a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective parts. These components are housed within a casing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. The battery pack, as a rechargeable battery, is the power source for new energy vehicles. The battery pack includes a casing and multiple battery cells housed within it. The battery array, composed of multiple battery cells connected in series and / or parallel, is placed within a casing and sealed with a cover, forming a battery pack capable of directly outputting electrical energy.

[0049] A battery cell can store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, the active materials can be reactivated by charging after discharge, allowing for continued use. A battery cell includes a casing and a battery cell housed within the casing.

[0050] The enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability and functionality requirements of the battery pack in different usage scenarios.

[0051] The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components inside the enclosure, ensuring their relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The battery pack enclosure generally consists of an upper enclosure and a lower enclosure. The lower enclosure typically has four side panels and a bottom plate. The four side panels can be integrally formed with the bottom plate or manufactured separately and fixedly connected. The enclosure can be cast from materials such as steel plate, aluminum alloy, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the enclosure can be cylindrical, cuboid, cube, etc.

[0052] The enclosure includes a base plate and a frame. The base plate is the main load-bearing component of the battery pack, typically referring to the structural member installed at the bottom of the enclosure, used to support and secure the battery pack, battery management system, cooling system, and other components inside the battery pack. The base plate is located at the bottom of the enclosure frame and is fixed to the bottom of the enclosure frame by welding, riveting, screwing, or other methods. The base plate can be made of various materials, such as high-strength materials like aluminum alloy, steel, and stainless steel. The base plate can be rectangular, circular, polygonal, or a plate-like structure; its shape is not limited, and its size is determined by the number and size of the battery cells contained in the battery pack. The enclosure includes a cavity enclosed by the base plate and the frame. The cavity includes battery compartments and electrical compartments spaced apart by a first partition plate. The battery compartments include multiple sub-battery compartments spaced apart by a second partition plate.

[0053] Conductive components are electrical parts that connect individual battery cells, battery packs, and external circuits. They can be used to electrically connect multiple battery packs, enabling series and parallel connections, and can electrically connect the output terminals of a battery pack to the output terminals of the battery module. Conductive components can be made of materials such as copper and gold.

[0054] Research has found that in battery packs with independently sealed sub-cells, the connection between the first and second separators needs to be sealed. However, to avoid increased resistance due to excessively long distances between the conductive bars connecting the two sub-cells, the conductive bars of adjacent sub-cells need to be placed close together. When the conductive bars of adjacent sub-cells are placed close together, vibration will impact the sealed connection between the first and second separators, making the sealed connection prone to failure. This can lead to gas crosstalk between adjacent sub-cells during thermal runaway, affecting the safety of the battery pack.

[0055] See Figures 1 to 22 The battery pack of this utility model includes a housing 1, a first partition plate 2, and a second partition plate 6. The housing 1 includes a bottom plate 101 and a frame 102 connected to the surface of the bottom plate 101. The bottom plate 101 and the frame 102 form a receiving cavity, which includes a battery compartment 7 and an electrical compartment 3. The battery compartment 7 and the electrical compartment 3 are separated by the first partition plate 2. The battery compartment 7 includes at least two adjacent sub-battery compartments 701, which are separated by the second partition plate 6, and each sub-battery compartment 701 is independently sealed. To make the battery compartment 7 and the electrical compartment 3 independent spaces, the first partition plate 2 and the second partition plate 6 are sealed and fixedly connected. A conductive element 4 for the sub-battery compartment 701 is provided on the first partition plate 2, leading out to a through portion 201 of the electrical compartment 3. The conductive element 4 passes through the through portion 201 and is sealed to the through portion 201. The distance Lmm between the conductive element 4 and the second partition plate 6 along the first direction ranges from 2 to 20 mm, where the first direction is the length direction of the first partition plate 2. Figure 1 As shown. Lmm can specifically be any value among 2mm, 6mm, 10mm, 16mm, and 20mm, or a value between any two values. The first partition plate 2 includes a first surface 202 and a second surface 203 disposed opposite to each other, as shown... Figure 4 As shown, the first surface 202 is positioned close to the battery compartment 7, and the second surface 203 is positioned away from the battery compartment 7. Along the second direction, the end of the second partition plate 6 closest to the electrical compartment 3 does not extend beyond the second surface 203. The first surface 202 and the second surface 203 can be arranged parallel or non-parallel. The second direction is the length direction of the second partition plate 6. Figure 3As shown. The first direction is perpendicular to the second direction. The end of the second partition plate 6 near the electrical compartment 3 does not extend beyond the second surface 203, thereby avoiding occupying space in the electrical compartment 3, facilitating the installation of electrical components, and preventing interference with components inside the electrical compartment 3. Since the electrical components inside the electrical compartment 3 contain high voltage, if the second partition plate 6 extends beyond the second surface 203, the risk of short circuits will increase.

[0056] By dividing the battery compartment 7 into multiple independent, sealed sub-battery compartments 701, thermal runaway failure of a battery in one sub-battery compartment 701 will not affect the batteries in other sub-battery compartments 701, thus improving the safety of the battery compartment. The battery compartment 7 is divided into different sub-battery compartments 701 by a second partition plate 6, with a sealed connection between the first partition plate 2 and the second partition plate 6. The sub-battery compartments 701 are used to house battery packs composed of individual battery cells 5, while the electrical compartment 3 houses electrical control components, etc. Battery packs in adjacent sub-battery compartments 701 are connected in parallel or series via conductive elements 4. There are both parallel and series circuits between battery packs in different sub-battery compartments 701. When high-voltage transmission or increased battery charge / discharge rate is required, a series circuit is used, connecting the battery packs in series; when a battery pack poses a safety risk or only one battery pack needs to be charged / discharged, a parallel circuit is used, connecting the battery packs in parallel.

[0057] The conductive component 4 is a part that passes through the through-part 201. Since the conductive component 4 is a suspended structure that is not fully supported and fixed, it will also vibrate when the battery pack vibrates. This vibration is transmitted to the first separator 2 and the second separator 6, causing them to vibrate as well. This vibration can lead to connection failure at the fixed joint between the first separator 2 and the second separator 6, resulting in seal failure at the joint. To prevent the vibration of the conductive component 4 from affecting the seal at the joint between the first separator 2 and the second separator 6, the distance Lmm between the conductive component 4 and the second separator 6 along the first direction is limited. If Lmm is too small, the distance between the conductive component 4 and the second separator 6 is too small, making the seal at the joint between the first separator 2 and the second separator 6 more susceptible to the influence of the conductive component 4's vibration. This vibration significantly increases the risk of seal failure at the joint between the first separator 2 and the second separator 6. If Lmm is too large, the distance between the conductive parts 4 of the two adjacent sub-battery compartments 701 will be too large. In order to facilitate the connection, the length of the conductive parts 4 needs to be longer, which will increase the internal resistance. The heat generated during high-rate charging and discharging will be greater, which will affect the overcurrent.

[0058] The battery pack of this invention divides the cavity formed by the base plate 101 and the frame 102 into a battery compartment 7 and an electrical compartment 3 by a first partition plate 2, preventing the components in the electrical compartment 3 from being affected in the event of battery thermal runaway. The battery compartment 7 is further divided into multiple sealed sub-battery compartments 701 by a second partition plate 6, preventing the battery pack in one sub-battery compartment 701 from experiencing thermal runaway and affecting the power supply to the batteries in other sub-battery compartments 701. Battery packs in sub-battery compartments 701 that have not experienced thermal runaway can still provide power normally, improving the safety performance of the battery pack. While ensuring sufficient installation space for electrical components in the electrical compartment by ensuring that the end of the second partition plate near the electrical compartment does not extend beyond the first partition plate into the electrical compartment, and controlling the distance Lmm between the conductive element 4 and the second partition plate 6 along the first direction, the risk of seal failure at the connection between the first partition plate 2 and the second partition plate 6 is reduced, and the excessive length of the conductive element 4 can be prevented from affecting overcurrent. The end of the second partition plate 6 near the electrical compartment 3 does not extend beyond the second surface 203, further ensuring the safety performance of the battery pack.

[0059] In one embodiment, along the second direction, the end of the second partition plate 6 near the electrical compartment 3 does not extend beyond the first surface 202, that is, the end of the second partition plate 6 near the electrical compartment 3 abuts against the first surface 202. The second partition plate 6 is welded or bonded to the first surface 202 to achieve a sealed connection between the end of the second partition plate 6 near the first partition plate 2 and the first surface 202. In this embodiment, since the first partition plate 2 and the second partition plate 6 abut against each other, it is convenient to install them, thereby improving the assembly efficiency of the housing 1. At the same time, since the abutment position of the first partition plate 2 and the second partition plate 6 is welded or bonded, the strength of the connection position is relatively low. If the conductive component 4 is too far from the bottom plate 101, that is, the height of the conductive component 4 is too high, the amplitude of the shaking when the conductive component 4 vibrates is greater, and the vibration impact is too large, which has a greater impact on the strength of the connection position between the first partition plate 2 and the second partition plate 6. Therefore, it is necessary to limit the height of the conductive component 4 to ensure the sealing of the connection position between the first partition plate 2 and the second partition plate 6. The distance between the conductive component 4 and the bottom plate 101 is H1mm. Figure 6 As shown, H1mm ranges from 10 to 60 mm. Specifically, H1mm can be any value among 10 mm, 20 mm, 35 mm, 45 mm, and 60 mm, or a value between any two values. By limiting the range of H1mm between the conductive element 4 and the base plate 101, excessive vibration amplitude of the conductive element 4 is avoided from affecting the reliable connection between the first partition plate 2 and the second partition plate 6. At the same time, the distance between the conductive element 4 and the base plate 101 is not too close or too long, which would affect the overcurrent.

[0060] In another embodiment, along the second direction, one end of the second partition plate 6 near the electrical compartment 3 penetrates the first surface 202, while the other end of the second partition plate 6 near the electrical compartment 3 does not extend beyond the second surface 203; that is, the end of the second partition plate 6 is inserted into the first partition plate 2. Figure 7 and Figure 8 As shown, Figure 7 The bottom of the first partition plate 2 is partially cut at the insertion position of the second partition plate 6. In this case, the connection reliability between the first partition plate 2 and the second partition plate 6 is better, and the connection seal at the joint is better. The area of ​​the through portion 201 on the first surface 202 is A1 mm. 2 The area of ​​the first surface 202 is A2 mm. 2 ,like Figure 9 As shown, A1 is Figure 9 In the grid area, A2 is... Figure 9 The area with the diagonal line in the middle. The through section 201 can specifically be a through hole or a through groove, A1mm. 2 This refers to the end area of ​​the through hole. In this embodiment, the connection strength and sealing performance at the connection position between the first partition plate 2 and the second partition plate 6 are good. The area of ​​the through portion 201 on the first surface 202 can account for a larger proportion. The specific proportion is set according to actual needs to meet the needs of the conductive component 4 with a larger cross-section, reduce resistivity, and improve the current flow of the conductive component 4.

[0061] When the end of the second partition plate 6 is inserted into the first partition plate 2, in one scenario, the portion of the second partition plate 6 inserted into the first partition plate 2 includes a first top surface away from the bottom plate 101, and the first partition plate 2 includes a second top surface away from the bottom plate 101. To facilitate a tight seal at the top of the first partition plate 2, in a third-direction upward direction, the distance from the first top surface to the bottom plate 101 is less than the distance from the second top surface to the bottom plate 101, and the first top surface and the second top surface are spaced apart by a first distance H2mm. Figure 10 and Figure 11As shown, H2mm ranges from 10 to 60 mm. Specifically, H2mm can be any value among 10mm, 20mm, 35mm, 45mm, and 60mm, or a value between any two of these. The third direction is perpendicular to the base plate 101, and is perpendicular to both the second and first directions. Here, the relationship between the top surface height of the portion of the second partition plate 6 not inserted into the first partition plate 2 and the top surface height of the first partition plate 2 is not limited. By limiting the range of H2mm, the fixing strength between the first partition plate 2 and the second partition plate 6 can be ensured, improving the sealing effect, while also ensuring the flatness of the top surface of the first partition plate 2, facilitating the sealing of the top surface of the first partition plate 2. If the value of H2 is too large, the height of the portion of the second partition plate 6 inserted into the first partition plate 2 is small, resulting in fewer insertion points between the second partition plate 6 and the first partition plate 2, poor connection strength, and a tendency for cracking at the connection point, leading to poor sealing between the sub-battery compartments 701. The value of H2 is too small. The second partition plate 6 is inserted into the top surface of the plate body of the first partition plate 2, which is too close to the top surface of the first partition plate 2. The plate body of the first partition plate 2 at this position is relatively thin and is prone to deformation during vibration, which affects the sealing of the top surface of the first partition plate 2.

[0062] When the end of the second partition plate 6 is inserted into the first partition plate 2, in another scenario, the portion of the second partition plate 6 inserted into the first partition plate 2 includes a first top surface away from the bottom plate 101, and the first partition plate 2 includes a second top surface away from the bottom plate 101. Along a third upward direction, the first and second top surfaces are flush. Figure 7 and Figure 8 As shown. This connection structure increases the area of ​​the connection surface at the connection position, preventing the second partition plate 6 from inserting into the body of the first partition plate 2 and causing deformation of the first partition plate 2, thereby avoiding sealing failure of the top surface of the first partition plate 2 caused by deformation. The third direction is the direction perpendicular to the base plate 101. The third direction is perpendicular to the base plate, and the third direction is perpendicular to both the second direction and the first direction.

[0063] In all the above embodiments, the bottom surfaces of the second partition plate 6 and the first partition plate 2 are sealed to the bottom plate 101.

[0064] To facilitate installation and ensure reliable connection, the second partition plate 6 is inserted into the first partition plate 2 along the second direction, with a distance of L1mm between it and the second surface 203. L1mm ranges from 1 to 40mm. Specifically, L1mm can be any value among 1mm, 10mm, 25mm, 30mm, and 40mm, or a value between any two of these. If L1 is too large, the portion of the second partition plate 6 inserted into the first partition plate 2 will be too short, resulting in poor reliability of the connection between the second partition plate 6 and the first partition plate 2. If L1 is too small, the portion of the second partition plate 6 inserted into the first partition plate 2 will be too long, making installation inconvenient.

[0065] To ensure the strength and sealing of the connection between the second partition plate 6 and the first partition plate 2, the height ratio of the portion of the second partition plate 6 located inside the first partition plate 2 to the height of the portion of the second partition plate 6 located between adjacent sub-battery compartments 701, along a third direction, ranges from 0.05 to 0.9. Specifically, it can be any value from 0.05, 0.25, 0.45, 0.7, and 0.9, or a value between any two of these values. Specifically, the height of the portion of the second partition plate 6 located between adjacent sub-battery compartments 701 ranges from 50 to 200 mm, specifically any value from 50 mm, 80 mm, 125 mm, 165 mm, and 200 mm, or a value between any two of these values. The height of the portion of the second partition plate 6 located inside the first partition plate 2 ranges from 5 to 50 mm, specifically any value from 5 mm, 10 mm, 25 mm, 40 mm, and 50 mm, or a value between any two of these values.

[0066] Specifically, the first partition plate 2 includes a cavity 206 and a first cavity plate 204 and a second cavity plate 205 spaced apart by the cavity 206, as shown below. Figure 12 As shown, the first cavity plate 204 is disposed on the side closer to the battery compartment 7, and the second cavity plate 205 is disposed on the side farther away from the battery compartment 7. A cavity 206 is provided between the first cavity plate 204 and the second cavity plate 205. By providing a cavity 206 between the first cavity plate 204 and the second cavity plate 205, it is beneficial to reduce the weight of the first partition plate 2 and facilitate the connection between the first partition plate 2 and the second partition plate 6, reducing the risk of cracking during welding.

[0067] When the first partition plate 2 is provided with the first cavity plate 204 and the second cavity plate 205, in one case, along the second direction, the end of the second partition plate 6 inserted into the first partition plate 2 is spaced apart from the second cavity plate 205, such as... Figure 12As shown, the distance between the end of the second partition plate 6 inserted into the first partition plate 2 and the second cavity plate 205 is H3mm. H3mm ranges from 1 to 20mm, specifically any value among 1mm, 4mm, 8.5mm, 15mm, and 20mm, or any value between any two. Setting H3mm within this range ensures both the reliability of the connection and facilitates the installation of the second partition plate 6 and the first partition plate 2. The distance between the end of the second partition plate 6 inserted into the first partition plate 2 and the second cavity plate 205 facilitates the installation of the second partition plate 6 and the first partition plate 2. In another scenario, along the second direction, the end of the second partition plate 6 inserted into the first partition plate 2 abuts against the second cavity plate 205, as shown... Figure 13 As shown, the end of the second partition plate 6 inserted into the first partition plate 2 is welded to the surface of the second cavity plate 205 away from the electrical compartment 3, increasing the sealing connection surface between the first partition plate 2 and the second partition plate 6, thereby improving the connection strength and sealing performance between the first partition plate 2 and the second partition plate 6. In the third case, along the second direction, the end of the second partition plate 6 inserted into the first partition plate 2 extends to the surface of the second cavity plate 205 away from the first cavity plate 204, that is, along the second direction, the second partition plate 6 just penetrates the first partition plate 2, as shown. Figure 14 As shown, the end of the second partition plate 6 near the electrical compartment 3 is flush with the second surface 203, and the end of the second partition plate 6 is welded to the second cavity plate. The flush arrangement of the end of the second partition plate 6 near the electrical compartment 3 with the second surface 203 improves the fixed connection strength between the first partition plate 2 and the second partition plate 6, thereby ensuring the sealing effect at the connection between the first partition plate 2 and the second partition plate 6. In this embodiment, the second partition plate 6 may also have a cavity extending along the second direction, which guides the thermal runaway gas out, thus preventing the thermal runaway gas from rapidly entering other sub-battery compartments 701 when the seal at the connection between the first partition plate 2 and the second partition plate 6 fails. In this embodiment, if the second partition plate 6 is inserted into the top surface of the plate body portion of the first partition plate 2 away from the bottom plate 101, and is flush with the top surface of the first partition plate 2 away from the bottom plate 101, then the first partition plate 2 is divided into two independent plates, which are respectively located on both sides of the second partition plate 6.

[0068] To prevent gas generated by thermal runaway from interfering with other sub-battery compartments 701 through cavity 206 in the event of a failure in the sealing connection between the two partition plates, the first partition plate 2 further includes several spaced reinforcing ribs 207. These reinforcing ribs 207 are disposed within the cavity 206, and different reinforcing ribs 207 extend parallel to each other along the first direction, such as... Figure 15As shown, reinforcing ribs 207 are disposed within the cavity 206, dividing the cavity 206 along a third direction to form multiple sub-cavities 2061. The end of the second partition plate 6 extending into the first partition plate 2 is located within one of the sub-cavities 2061. The orthographic projection of the portion of the second partition plate 6 inserted into the first partition plate 2 onto the plane perpendicular to the first direction does not overlap with the orthographic projection of the reinforcing rib 207 onto the plane perpendicular to the first direction; that is, the second partition plate 6 and the reinforcing rib 207 do not intersect. When the battery in a sub-battery compartment 701 experiences thermal runaway, and the connection seal between the first partition plate 2 and the second partition plate 6 fails, the gas generated by the battery thermal runaway is discharged along the sub-cavity 2061 to the exhaust port, preventing the thermal runaway gas from accumulating in the cavity 206 and failing to escape, which could easily cause crosstalk between different sub-battery compartments 701. In a specific embodiment, refer to... Figure 15 The diagram shows a cross-section of the first partition plate 2 along the third direction and the first direction. Two reinforcing ribs 207 are provided, extending parallel to each other along the first direction, thus dividing the cavity 206 into three sub-cavities 2061. The end of the second partition plate 6 extending into the first partition plate 2 is only located in the middle sub-cavity 2061. Therefore, when the connection seal between the first partition plate 2 and the second partition plate 6 fails, the thermally runaway gas enters the middle sub-cavity 2061, exits along the first direction from the first partition plate 2, and flows through the exhaust channel to the exhaust port for discharge. Figure 16 The diagram shown is a structural schematic of the first partition plate 2 cut along the plane containing the second and third directions.

[0069] In another embodiment, the reinforcing ribs 207 disposed within the cavity 206 of the first partition plate 2 may also extend along the third direction, such as... Figure 17 As shown, different reinforcing ribs 207 are arranged parallel to each other along the third direction. The reinforcing ribs 207 are disposed in the cavity 206, dividing the cavity 206 into multiple sub-cavities 2061. The end of the second partition plate 6 extending into the first partition plate 2 is located in one of the sub-cavities 2061. The sub-cavity 2061 where the through part 201 is located is not connected to the sub-cavity 2061 where the end of the second partition plate 6 is inserted into the first partition plate 2. In this embodiment, the thermal failure gas entering the sub-cavity 2061 is not easily discharged, but it still has the function of preventing gas crosstalk in different sub-cell compartments 701, and can prevent gas from flowing to the through part 201, thus preventing gas from diffusing into other chambers through the through part 201.

[0070] In the third embodiment, as Figure 18As shown, the first partition plate 2 includes a plurality of spaced reinforcing ribs 207. Different reinforcing ribs 207 extend parallel to each other along the first direction. The reinforcing ribs 207 are disposed in the cavity 206 and divide the cavity 206 along the third direction to form a plurality of sub-cavities 2061. The orthographic projection of the portion of the second partition plate 6 inserted into the first partition plate 2 on the plane perpendicular to the first direction at least partially overlaps with the orthographic projection of the reinforcing rib 207 on the plane perpendicular to the first direction. That is, the end of the second partition plate 6 extending into the first partition plate 2 at least partially overlaps with the reinforcing rib 207, thereby improving the strength of the connection between the second partition plate 6 and the first partition plate 2 and reducing the risk of failure of the fixed connection between the second partition plate 6 and the first partition plate 2.

[0071] In the fourth embodiment, to prevent gas generated by battery thermal runaway from flowing to the conductive component 4 after the seal at the connection between the first partition plate 2 and the second partition plate 6 fails, thereby affecting the seal at the conductive component 4, the cavity 206 is divided into multiple sub-cavities 2061. These sub-cavities 2061 can be arranged in different directions or angles as needed. The sub-cavity 2061 containing the conductive component 4 is not connected to the sub-cavity 2061 where the end of the second partition plate 6 is inserted into the first partition plate 2. This prevents leaked high-temperature gas from affecting the seal at the conductive component 4 after the seal at the connection between the first partition plate 2 and the second partition plate 6 fails during thermal runaway. In this embodiment, when the cavity 206 is divided into multiple sub-cavities 2061, a barrier is used for separation. This barrier can be a reinforcing rib 207, foam, or other structural separation, as long as it separates the cavity area containing the conductive component 4 from the cavity area where the connection between the first partition plate 2 and the second partition plate 6 is located.

[0072] To improve the connection strength between the second partition plate 6 and the first partition plate 2, and to facilitate the insertion of the second partition plate 6 into the first partition plate 2, the length of the portion of the second partition plate 6 inserted into the first partition plate 2 along the second direction is L2mm, and the thickness of the first partition plate 2 along the second direction is L3mm. Figure 11As shown, the range of L2 / L3 is 0.06~0.7, specifically any value from 0.06, 0.2, 0.4, 0.55, 0.7, or any value between any two values. If the L2 / L3 ratio is too small, the connection strength between the second partition plate 6 and the first partition plate 2 is poor; if the L2 / L3 ratio is too large, the installation of the second partition plate 6 into the first partition plate 2 is difficult, resulting in low installation efficiency. Specifically, the range of L2mm is 9~110mm, specifically any value from 9mm, 25mm, 50mm, 85mm, 110mm, or any value between any two values. The range of L3mm is 10~150mm, specifically any value from 10mm, 45mm, 80mm, 125mm, 150mm, or any value between any two values.

[0073] In one embodiment, the conductive elements 4 of two adjacent sub-battery compartments 701, positioned close to each other, are led out through the same through-hole 201 provided on the first partition plate 2. When the through-hole 201 is a through hole, the conductive elements 4 of two adjacent sub-battery compartments 701, positioned close to each other, are led out through the same through hole. It can be understood that, to facilitate the lead-out of the conductive elements 4, the through hole communicates with the inner cavities of both adjacent sub-battery compartments 701, such as... Figure 19 As shown, Figure 19 The diagram shows a cross-sectional view of two conductive elements 4, each connected to a battery pack within a sub-battery compartment 701. In this embodiment, to facilitate the exit of the conductive elements 4 from adjacent sub-battery compartments 701, and to avoid excessively large openings in the through-hole 201 affecting the strength of the first partition plate 2, the distance between the conductive element 4 and the second partition plate 6 cannot be too large. The interval Lmm between the conductive element 4 and the second partition plate 6 along the first direction ranges from 2 to 40 mm, specifically any value among 2 mm, 18 mm, 25 mm, 30 mm, and 40 mm, or a value between any two values. To improve the sealing performance at the point where the conductive element 4 passes through, such as... Figure 20 The diagram shows a structure in which a sealing element 8 is provided in the gap between the conductive element 4 and the through portion 201. The sealing element 8 is... Figure 20 The grid line filler is used to ensure a seal between the conductive element 4 and the through part 201.

[0074] In order to reduce the size of the sealing surface between a single conductive element 4 and the through section 201, thereby improving the sealing performance at the through section 201, the end of the second partition plate 6 is at least partially located inside the through section 201, dividing the through section 201 into two sub-through sections, each of which corresponds to the lead-out of a conductive element 4 of a sub-battery compartment 701.

[0075] In another embodiment, at least two through-sections 201 are provided, with adjacent through-sections 201 spaced apart, and the conductive elements 4 in different sub-battery compartments 701 are led out from different through-sections 201. By leading the conductive elements 4 out from different through-sections 201, it is easier to seal the conductive elements 4 and reduce the gap that needs to be sealed between the sealing element 8 and the through-section 201. To improve the sealing performance around the conductive elements 4, the conductive elements 4 are connected to the through-section surface of the through-section 201 by the sealing element 8. The distance between the sealing element 8 and the second partition plate 6 is L4mm, and L4mm ranges from 10 to 40mm, specifically any value among 10mm, 15mm, 25mm, 35mm, and 40mm, or a value between any two values. By limiting the distance between the sealing element 8 and the second partition plate 6, it is easy for the sealing element 8 to be inserted into the gap between the through-section 201 and the conductive elements 4 for sealing, and the sealing effect can be guaranteed, while avoiding the conductive elements 4 being too long and affecting the current flow. When the value of L4 is too small, the distance between the seal 8 and the second partition plate 6 is too close, which affects the installation of the seal 8 and the sealing effect. When the value of L4 is too large, the distance between the conductive element 4 and the second partition plate 6 is too large, and the length of the conductive element 4 is too long, which affects the current flow of the conductive element 4.

[0076] To ensure a tight seal between the conductive element 4 and the through portion 201, the dimensions of the through portion 201 are larger than those of the conductive element 4 along both the first and third directions. This allows for the installation of sealing elements 8 in the gaps between the through portion 201 and the conductive element 4. The sealing elements 8 are fitted around the conductive element 4 at the point where it passes through the through portion 201, and the conductive element 4 and the through portion 201 are sealed together by the sealing elements 8, thus ensuring a more reliable sealing connection. Furthermore, the thickness of the sealing element 8 is W mm. The thickness of the sealing element 8 is the minimum dimension of the sealing element 8 between the inner wall of the through portion 201 perpendicular to the second direction and the surface of the conductive element 4. The range of W mm is 1~5 mm, specifically any value among 1 mm, 1.5 mm, 3 mm, 3.8 mm, and 5 mm, or a value between any two values. Figure 22 As shown. Where W is the distance between the conductive element 4 and the through portion 201. Figure 22 The spacing in one direction is only shown in the diagram. The value of W is set within the aforementioned range, ensuring that the width of the sealing structure between the conductive element 4 and the through-hole 201 is within a suitable range, thus achieving a reliable seal between the conductive element 4 and the through-hole 201. If the value of W is too small, the width of the seal 8 is too small, resulting in poor cushioning of the conductive element 4. Vibration of the conductive element 4 can easily cause the first partition plate 2 to vibrate, affecting the sealing effect at the connection between the first partition plate 2 and the second partition plate 6. If the width of the seal 8 is too large, the seal 8 provides poor support for the conductive element 4, making it prone to seal failure during vibration.

[0077] To reduce the impact of high-temperature gases from thermal runaway on the sealing of the connection between the first separator 2 and the second separator 6, the height of the second separator 6, located between two adjacent sub-battery compartments 701, is higher than the height of the first separator 2 along a third upward direction. Specifically, as shown... Figure 14 As shown, along the third direction upwards, the height of the second partition plate 6 located between two adjacent sub-battery compartments 701 is H5mm, and the height of the first partition plate 2 is H4mm, where H5 > H4. This causes the high-temperature gas in the sub-battery compartment 701 to accumulate near the top of the second partition plate 6 during thermal runaway, reducing the amount of high-temperature gas directly impacting the connection between the first partition plate 2 and the second partition plate 6. This is beneficial for further ensuring the sealing performance of the connection between the first partition plate 2 and the second partition plate 6 during thermal runaway.

[0078] Furthermore, along the third direction upwards, the distance between the top of the first partition plate 2 and the top of the second partition plate 6 is 10~30mm, specifically any value among 10mm, 15mm, 20mm, 26mm, and 30mm, or a value between any two values. Setting the distance between the top of the first partition plate 2 and the top of the second partition plate 6 within the above range can reduce the impact of high-temperature gas on the connection point between the first partition plate 2 and the second partition plate 6 during thermal runaway, and also ensure reliable sealing between the battery compartment 7 and the electrical compartment 3, thereby reducing crosstalk of thermal runaway gas between the sub-battery compartments 701 and between the battery compartment 7 and the electrical compartment 3.

[0079] To reduce the impact of the conductive component 4 on the first partition plate 2 during vibration, the conductive component 4 and the through portion 201 are sealed together by a sealing component 8. The elastic modulus of the sealing component 8 is in the range of 1.5~9MPa, specifically any value among 1.5 MPa, 3MPa, 4.5MPa, 7MPa, and 9MPa, or a value between any two of these values. The elastic modulus of the sealing component 8 is set within the above range to ensure its buffering and sealing effects.

[0080] The battery pack of this utility model divides the interior of the battery pack into several sub-battery compartments 701, and the battery packs in different sub-battery compartments 701 are sealed and separated, which avoids mutual interference between battery packs in different compartments in the event of thermal runaway, thus improving safety performance.

[0081] This utility model also provides a battery device, including a battery pack, which is the aforementioned battery pack. The battery device can serve as an operating power source for electrical devices, or as a driving power source for electrical devices, replacing or partially replacing fuel or natural gas to provide driving power for vehicles. Electrical devices encompass a wide range of technical fields, including energy storage devices, electric ships, aircraft, laptops, power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace.

[0082] In the description of this solution, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0083] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, The device includes a housing, a first partition plate, and a second partition plate. The housing includes a bottom plate and a frame connected to the surface of the bottom plate. The bottom plate and the frame form a receiving cavity. The receiving cavity includes a battery compartment and an electrical compartment. The battery compartment and the electrical compartment are separated by the first partition plate. The battery compartment includes at least two adjacent sub-battery compartments. The adjacent sub-battery compartments are separated by the second partition plate, and each sub-battery compartment is independently sealed. The first partition plate and the second partition plate are sealed and fixedly connected. The first partition plate is provided with a conductive element for the sub-battery compartments to extend to a through portion of the electrical compartment. The conductive element is sealed and connected to the through portion. The distance Lmm between the conductive element and the second partition plate along a first direction is in the range of 2~20mm. The first direction is the length direction of the first partition plate. Along the second direction, the first partition includes a first surface and a second surface disposed opposite to each other, the first surface being disposed close to the battery compartment and the second surface being disposed away from the battery compartment, and along the second direction, the end of the second partition near the electrical compartment does not extend beyond the second surface; The second direction is the length direction of the second partition plate, and the first direction is perpendicular to the second direction.

2. The battery pack according to claim 1, characterized in that, Along the second direction, the end of the second partition plate near the electrical compartment does not extend beyond the first surface, the end of the second partition plate near the first partition plate is sealed to the first surface, and the distance H1mm between the conductive element and the bottom plate ranges from 10 to 60mm.

3. The battery pack according to claim 1, characterized in that, Along the second direction, the end of the second partition plate near the electrical compartment penetrates the first surface, while the end of the second partition plate near the electrical compartment does not extend beyond the second surface.

4. The battery pack according to claim 3, characterized in that, The portion of the second partition plate inserted into the first partition plate includes a first top surface away from the bottom plate, and the first partition plate includes a second top surface away from the bottom plate. In the third direction upward, the distance between the first top surface and the bottom plate is less than the distance between the second top surface and the bottom plate, and the first top surface and the second top surface are spaced apart by a first distance H2mm, where H2mm ranges from 10 to 60mm. The third direction is perpendicular to the base plate, and the third direction is perpendicular to both the second direction and the first direction.

5. The battery pack according to claim 3, characterized in that, The portion of the second partition plate inserted into the first partition plate includes a first top surface away from the bottom plate, and the first partition plate includes a second top surface away from the bottom plate. The first and second top surfaces are flush with each other along the third direction. The third direction is perpendicular to the base plate, and the third direction is perpendicular to both the second direction and the first direction.

6. The battery pack according to claim 3, characterized in that, Along the second direction, the portion of the second partition plate inserted inside the first partition plate is at a distance of L1mm from the second surface, and L1mm ranges from 1 to 40mm.

7. The battery pack according to claim 3, characterized in that, Along a third direction, the height of the portion of the second partition plate located inside the first partition plate is in the range of 0.05 to 0.9 compared to the height of the portion of the second partition plate located between adjacent sub-battery compartments.

8. The battery pack according to any one of claims 1 to 3, characterized in that, The first partition plate includes a cavity and a first cavity plate and a second cavity plate spaced apart by the cavity. The first cavity plate is disposed close to the battery compartment, and the second cavity plate is disposed away from the battery compartment.

9. The battery pack according to claim 8, characterized in that, Along the second direction, the end of the second partition plate inserted into the first partition plate is spaced apart from the second cavity plate, and the distance between the end of the second partition plate inserted into the first partition plate and the second cavity plate is H3mm, where H3mm ranges from 1 to 20mm.

10. The battery pack according to claim 8, characterized in that, Along the second direction, the end of the second partition plate inserted into the first partition plate abuts against the surface of the second cavity plate on the side away from the electrical compartment, and the end of the second partition plate inserted into the first partition plate is fixedly connected to the second cavity plate.

11. The battery pack according to claim 8, characterized in that, The first partition plate also includes a number of spaced reinforcing ribs. Different reinforcing ribs extend parallel to each other along the first direction. The reinforcing ribs are disposed in the cavity and divide the cavity into multiple sub-cavities along the third direction. The orthographic projection of the portion of the second partition plate inserted into the first partition plate on the plane perpendicular to the first direction does not overlap with the orthographic projection of the reinforcing ribs on the plane perpendicular to the first direction.

12. The battery pack according to claim 8, characterized in that, The first partition plate also includes a plurality of spaced reinforcing ribs. Different reinforcing ribs extend parallel to each other along the first direction. The reinforcing ribs are disposed in the cavity and divide the cavity into a plurality of sub-cavities along the third direction. The orthographic projection of the portion of the second partition plate inserted into the first partition plate on the plane perpendicular to the first direction at least partially overlaps with the orthographic projection of the reinforcing ribs on the plane perpendicular to the first direction.

13. The battery pack according to claim 8, characterized in that, The cavity includes multiple sub-cavities arranged along a third direction, and the sub-cavity where the through portion is located is not connected to the sub-cavity where the end of the second partition plate is inserted into the first partition plate.

14. The battery pack according to claim 1, characterized in that, Along the second direction, the length of the portion of the second partition plate inserted into the first partition plate is L2mm, the thickness of the first partition plate along the second direction is L3mm, and the range of L2 / L3 is 0.06~0.

7.

15. The battery pack according to claim 14, characterized in that, The range of L2mm is 9~110mm or the range of L3mm is 10~150mm.

16. The battery pack according to claim 1, characterized in that, Along the second direction, the end of the second partition plate near the electrical compartment is flush with the second surface.

17. The battery pack according to claim 1, characterized in that, The conductive elements of two adjacent sub-battery compartments are led out through the same through portion provided on the first partition plate, and the distance L between the conductive elements and the second partition plate along the first direction ranges from 2 to 40 mm.

18. The battery pack according to claim 17, characterized in that, The end of the second partition plate is at least partially located within the through section, dividing the through section into two sub-through sections, each of which leads out a conductive element of the sub-battery compartment.

19. The battery pack according to claim 1, characterized in that, At least two through-sections are provided, with adjacent through-sections spaced apart, and the conductive elements in different sub-battery compartments are led out from different through-sections.

20. The battery pack according to claim 19, characterized in that, The conductive element is connected to the through portion by a sealing element, and the distance between the sealing element and the second partition plate is L4mm, where L4mm ranges from 10 to 40mm.

21. The battery pack according to claim 1, characterized in that, The through portion and the conductive element are sealed by a sealing element, which is disposed between the conductive element and the through portion. The thickness of the sealing element is W mm, and the range of W mm is 1~5 mm.

22. The battery pack according to any one of claims 1-7 and 14-21, characterized in that, Along the third direction upwards, the height of the second partition plate located between two adjacent sub-battery compartments is higher than the height of the first partition plate.

23. The battery pack according to claim 22, characterized in that, Along the third direction upwards, the distance between the top of the first partition plate and the top of the second partition plate is 10~30mm.

24. The battery pack according to claim 1, characterized in that, The conductive components of the different sub-battery compartments are connected in series and / or in parallel.

25. The battery pack according to any one of claim 20 or 21, characterized in that, The elastic modulus of the seal is in the range of 1.5~9MPa.

26. A battery device comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1-25.

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