Battery pack and electric device

Abstract

The battery pack comprises a box body, the box body comprises a frame and a containing part defined by a bottom plate, the containing part is divided into an electrical bin and a battery bin by a first partition plate, the battery bin comprises a first sub-battery bin and a second sub-battery bin, and a communication channel is formed in the first partition plate; the conductive confluence pieces in the first sub-battery bin and the second sub-battery bin extend into the electrical bin through the communication channel, the conductive confluence pieces and the communication channel are in sealed connection through a first sealing piece, the distance between the first sealing piece and the bottom plate is h mm, the shortest distance between the conductive confluence pieces adjacent to the first sub-battery bin and the second sub-battery bin is L mm, and the distance between the first sealing piece and the bottom plate is L mm; the minimum spacing distance between the face, close to the conductive bus piece, of the first sealing piece and the face, away from the conductive bus piece, of the first sealing piece is d mm, and the parameters meet 0.4 < = L * d / h < = 195. According to the battery pack and the electric device, the problem of thermal runaway of adjacent battery packs caused by thermal runaway of one battery pack is avoided, and the safety performance is improved.

Description

Technical Field

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

[0002] Electric vehicles typically contain a battery pack, which is the device used to provide power to the electric vehicle. A battery pack generally consists of multiple battery cells, which are configured as multiple independently operating battery units, connected in series or parallel. This structural configuration means that if one battery cell in the battery pack experiences thermal runaway, it can trigger thermal runaway in adjacent battery cells, causing the entire battery pack to malfunction and affecting the normal operation of the electric vehicle. Summary of the Invention

[0003] In view of this, the present invention provides a battery pack and an electrical device that avoids the problem of thermal runaway of adjacent battery packs caused by sealing issues when one battery pack experiences thermal runaway, thereby improving the safety performance of the battery pack.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A battery pack includes a housing, the housing comprising a frame and a base plate, the frame and base plate being connected to form a receiving portion. A first partition is provided on the base plate, dividing the receiving portion into a sealed electrical compartment and a battery compartment. The battery compartment includes a first sub-battery compartment and a second sub-battery compartment arranged adjacent to each other along a first direction, the first and second sub-battery compartments being independently sealed. The electrical compartment and the battery compartment are arranged adjacent to each other along a second direction. A connecting channel is provided on the first partition for the passage of conductive busbars. The conductive busbars in the first and second sub-battery compartments extend into the electrical compartment through the connecting channel. The conductive busbars are sealed to the connecting channel by a first sealing member. Along a third direction, the distance between the first sealing member and the base plate is h mm. The shortest distance along the second direction between adjacent conductive busbars in the first and second sub-battery compartments is L mm. Perpendicular to the second direction, the minimum distance between the surface of the first sealing member closest to the conductive busbar and the surface furthest from the conductive busbar is d. mm, the above parameters satisfy the formula 0.4≤L×d / h≤195; where the third direction is the direction perpendicular to the base plate, and the first direction, the second direction and the third direction are set perpendicular to each other.

[0006] As can be seen from the above technical solution, the battery pack provided by the present invention, by setting a first partition to seal the electrical compartment and the battery compartment, and setting a connecting channel for the conductive busbar to pass through on the first partition, and the conductive busbar and the connecting channel are sealed and connected by a first sealing member, realizes the sealing of the conductive busbar passing through the first partition, and improves the sealing performance at the point where the conductive busbar passes through. By limiting the parameters hmm, Lmm and dmm to satisfy the formula 0.4≤L×d / h≤195, the first sub-battery compartment and the second sub-battery compartment have good sealing performance at the point where the conductive busbar is led out, avoiding the problem of thermal runaway of adjacent battery packs caused by the sealing of the point where the conductive busbar is led out when one battery pack thermally runs away. At the same time, it ensures that the conductive busbar has good current carrying capacity, so that the heat generation of the battery pack is reduced during high-rate charging and discharging, and the high-rate charging and discharging capability of the battery pack is improved.

[0007] The present invention also provides an electrical device, including a battery pack, wherein the battery pack is the battery pack described above.

[0008] The electrical device of the present invention 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

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a structural schematic diagram of a battery pack (without the cover) provided in an embodiment of the present invention at one angle;

[0011] Figure 2 This is a structural schematic diagram of the battery pack (without the cover) provided in an embodiment of the present invention from another angle;

[0012] Figure 3 This is a schematic diagram of the structure of the box provided in an embodiment of the present invention;

[0013] Figure 4 This is a schematic diagram of a conductive busbar installed on a first partition according to an embodiment of the present invention;

[0014] Figure 5 This is a schematic diagram of the structure of the first partition provided in an embodiment of the present invention;

[0015] Figure 6 This is a schematic diagram of the structure of the first sealing element provided in an embodiment of the present invention;

[0016] Figure 7 This is a schematic diagram of a conductive busbar mounted on a first partition according to another embodiment of the present invention;

[0017] Figure 8 This is a schematic diagram of the structure of the first sealing element installed on the first partition plate according to the first embodiment of the present invention;

[0018] Figure 9 for Figure 8 A partial sectional view of the structure;

[0019] Figure 10 This is a schematic diagram of the structure of the first sealing element installed on the first partition plate according to the second embodiment of the present invention;

[0020] Figure 11 This is a schematic diagram of the structure of the first sealing element installed on the first partition plate according to the third embodiment of the present invention;

[0021] Figure 12 This is a schematic diagram of a structure in which two conductive busbars share a single first seal, as provided in an embodiment of the present invention.

[0022] Figure 13 for Figure 12 A schematic diagram of the structure after removing the first seal in the embodiment;

[0023] Figure 14 This is a schematic diagram of the structure of two conductive busbars, each equipped with a first sealing element, provided in an embodiment of the present invention.

[0024] Figure 15 This is a schematic diagram of the structure of the first partition provided in an embodiment of the present invention;

[0025] Figure 16 for Figure 15 A cross-sectional view of the AA position;

[0026] Figure 17 for Figure 15 A cross-sectional view of the BB position;

[0027] Figure 18 A schematic diagram of the structure of a conductive busbar with a bent portion provided in an embodiment of the present invention;

[0028] Figure 19 A schematic diagram of the structure of the large-faced vertical base plate of the through-section of the conductive busbar provided in an embodiment of the present invention;

[0029] Figure 20 This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the first embodiment of the present invention;

[0030] Figure 21This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the second embodiment of the present invention;

[0031] Figure 22 A schematic diagram of the structure of a conductive busbar with a bent portion at one angle provided in the third embodiment of the present invention;

[0032] Figure 23 A schematic diagram of the conductive busbar with a bent portion from another angle, provided in the third embodiment of the present invention;

[0033] Figure 24 This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the fourth embodiment of the present invention;

[0034] Figure 25 This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the fifth embodiment of the present invention;

[0035] Figure 26 This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the sixth embodiment of the present invention;

[0036] Figure 27 This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the seventh embodiment of the present invention;

[0037] Figure 28 This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the eighth embodiment of the present invention;

[0038] Figure 29 This is a schematic diagram of the structure of a conductive busbar with a bent portion provided in the ninth embodiment of the present invention;

[0039] Figure 30 A schematic diagram of a structure at an angle in which a sealing layer is disposed within the cavity of the first partition provided in an embodiment of the present invention;

[0040] Figure 31 for Figure 30 A cross-sectional view of the ZZ position;

[0041] Figure 32 A cross-sectional view of the first partition provided in an embodiment of the present invention, showing the arrangement of a partition rib within the cavity.

[0042] Figure 33 The diagram shows a slotted structure provided on the top of the first partition for the communication channel provided in an embodiment of the present invention.

[0043] in:

[0044] 1. Box body,

[0045] 101. Base plate; 102. Electrical compartment; 103. Battery compartment.

[0046] 2. First partition,

[0047] 201. Connecting channel; 202. Cavity; 203. Separating rib.

[0048] 3. Conductive busbars,

[0049] 301. First r-angle; 302. First straight segment; 303. Second r-angle; 304. First vertical segment; 305. Third r-angle; 306. Second vertical segment; 307. Fourth r-angle; 308. Second straight segment.

[0050] 4. First sealing element,

[0051] 401, First through hole,

[0052] 5. Second partition,

[0053] 6. Battery cells,

[0054] 7. Auxiliary layer

[0055] 8. Sealing layer

[0056] 9. Second sealing element. Detailed Implementation

[0057] This invention discloses a battery pack and an electrical device that avoids the problem of thermal runaway of adjacent battery packs caused by sealing issues when one battery pack experiences thermal runaway, thereby improving the safety performance of the battery pack.

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] 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.

[0060] 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.

[0061] The enclosure, typically a closed or semi-closed structure made of materials such as metal or plastic, serves as the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The battery pack enclosure provides installation space for the battery pack, BMS (Battery Management System), cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components within the enclosure body, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The enclosure generally includes a main body and a cover. The main body includes a base plate and side plates connected to and surrounding the base plate; the cover is connected to the side plates and has a cover plate opposite to the base plate. The cover and the main body together enclose a receiving chamber.

[0062] The battery casing can be cast from materials such as steel plates and aluminum alloys, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the battery casing can be cylindrical, cuboid, cube, etc.

[0063] Conductive busbars are used to electrically connect multiple battery packs, enabling series / parallel connections. They can electrically connect the output terminals of battery packs to the output terminals of the battery stack. Conductive busbars can be made of metals such as copper and gold.

[0064] See Figures 1 to 32 The battery pack of the present invention includes a housing 1, which includes a frame and a bottom plate 101. The frame and the bottom plate 101 are connected to form a receiving portion. A first partition 2 is provided on the bottom plate 101, which divides the receiving portion into a sealed electrical compartment 102 and a battery compartment 103. The battery compartment 103 includes a first sub-battery compartment and a second sub-battery compartment arranged adjacent to each other along a first direction. The first sub-battery compartment and the second sub-battery compartment are independently sealed. The electrical compartment 102 and the battery compartment 103 are arranged adjacent to each other along a second direction. A connecting channel 201 is provided on the first partition 2 for the passage of a conductive busbar 3. The conductive busbar 3 in the first sub-battery compartment and the second sub-battery compartment extends into the electrical compartment 102 through the connecting channel 201. The conductive busbar 3 and the connecting channel 201 are sealed together by a first sealing member 4. Along a third direction, such as... Figure 4As shown, the distance between the first sealing element 4 and the base plate 101 is h mm, which is the minimum distance between the first sealing element 4 and the base plate 101; the shortest distance between the adjacent conductive busbars 3 of the first and second sub-battery compartments is L mm; perpendicular to the second direction, the minimum interval between the surface of the first sealing element 4 near the conductive busbar 3 and the surface away from the conductive busbar 3 is d mm. These parameters satisfy the formula 0.4 ≤ L × d / h ≤ 195. It can be understood that d mm here refers to the minimum distance the end of the first sealing element 4 extends along the surface of the first partition 2. L mm, h mm, and d mm can be measured using calipers.

[0065] The first and second sub-battery compartments are separated by a second partition 5, and the connection between the first and second partitions 2 and 5 is sealed. The first partition 2 extends along a first direction, and the second partition 5 extends along a second direction, so that the first and second sub-battery compartments are arranged along the first direction. The first and second sub-battery compartments are used to house battery packs composed of individual battery cells 6, and the electrical compartment 102 is used to house electrical components. The battery packs in the first and second sub-battery compartments are connected in parallel or in series through conductive busbars 3. There are both parallel and series circuits between the battery packs in different sub-battery compartments. When high-voltage transmission or increasing the battery charge / discharge rate is required, a series circuit is used, and the battery packs are connected in series; when there is a safety risk in one battery pack or only one battery pack needs to be charged and discharged, the circuit is switched to parallel, and the battery packs are connected in parallel. By dividing the battery compartment 103 into multiple independent, sealed sub-battery compartments, thermal runaway failure of a battery in one sub-battery compartment will not affect the batteries in other sub-battery compartments, thus improving the safety of the battery compartment. The material of the first sealing element 4 can be sealant, gasket, etc. The sealant can be silicone sealant, polyurethane sealant, or epoxy resin sealant, etc., and the gasket can be EPDM rubber, fluororubber, etc. The third direction is perpendicular to the base plate, and the first direction and the second direction are perpendicular to each other.

[0066] The conductive busbar 3 is a component connected through the connecting channel 201. Since the conductive busbar 3 is a suspended structure that is not fully supported and fixed, it will also vibrate when the battery pack vibrates. The vibration of the conductive busbar 3 will affect the sealing of the first seal 4. When the shortest distance Lmm between adjacent conductive busbars 3 in different sub-battery compartments is too large, the distance between adjacent conductive busbars 3 in the first and second sub-battery compartments will be too large. In order to facilitate connection, the length of the conductive busbar 3 needs to be extended, resulting in a longer current path, increased internal resistance, and greater heat generation during high-rate charging and discharging, which affects the current carrying capacity between battery packs. When Lmm is too small, the conductive busbars 3 in adjacent sub-battery compartments are too close. During vibration, the vibration of the conductive busbar 3 is concentrated, increasing the impact on the sealing of the first seal 4 and resulting in poor sealing performance. When the distance hmm between the first seal 4 and the base plate 101 is too large, the first seal 4 is too close to the top of the first separator 2 away from the base plate 101. During battery thermal runaway, high-temperature gas easily accumulates at the top of the battery pack, making it more susceptible to affecting the first seal 4 located at the top of the first separator 2, leading to seal failure. When hmm is too small, the first seal 4 is too close to the bottom of the first separator 2, resulting in lower bottom strength. When the bottom of the battery pack is impacted by foreign objects or vibrated, the bottom of the first separator 2 may crack, leading to seal failure. When the distance dmm between the surface of the first seal 4 near the conductive busbar 3 and the surface away from the conductive busbar 3 is too large, the proportion of the cross-sectional area of ​​the first seal 4 relative to the lead-out position of the conductive busbar 3 increases, resulting in a smaller cross-sectional area of ​​the conductive busbar 3 and poor current-carrying capacity between battery cells. When dmm is too small, the vibration resistance of the first seal 4 is poor, making it prone to seal failure during vibration.

[0067] The battery pack of the present invention, by setting a first partition 2 to seal the electrical compartment 102 and the battery compartment 103, and setting a connecting channel 201 on the first partition 2 for the conductive busbar 3 to pass through, and the conductive busbar 3 and the connecting channel 201 are sealed and connected by a first sealing member 4, realizes the sealing of the conductive busbar 3 passing through the first partition 2, and improves the sealing performance at the point where the conductive busbar 3 passes through. By limiting the parameters hmm, Lmm and dmm to satisfy the formula 0.4≤L×d / h≤195, the first sub-battery compartment and the second sub-battery compartment have good sealing performance at the point where the conductive busbar 3 is led out, avoiding the problem of thermal runaway of adjacent battery packs caused by the sealing of the point where the conductive busbar 3 is led out when one battery pack thermally runs away. At the same time, it ensures that the conductive busbar 3 has good current carrying capacity, so that the heat generation of the battery pack is reduced during high-rate charge and discharge, and the high-rate charge and discharge capability of the battery pack is improved.

[0068] Wherein, Lmm ranges from 20 to 700 mm, and Lmm can be any value among 20 mm, 100 mm, 180 mm, 350 mm, 500 mm, and 700 mm, or a value between any two values. dmm ranges from 1 to 7 mm, and dmm can be any value among 1 mm, 2.5 mm, 3 mm, 4.5 mm, 6 mm, and 7 mm, or a value between any two values. hmm ranges from 10 to 80 mm, and hmm can be any value among 10 mm, 20 mm, 35 mm, 50 mm, 65 mm, and 80 mm, or a value between any two values.

[0069] In one embodiment, such as Figure 6 As shown, the first sealing member 4 is provided with a first through hole 401 for the conductive busbar 3 to pass through. Along a direction perpendicular to the second direction, the outer side of the first sealing member 4 abuts against the inner surface of the connecting channel 201. The first sealing member 4 is fixedly connected to or pressed against the connecting channel 201. The wall of the first through hole 401 contacts the conductive busbar 3 through the auxiliary layer 7. (Refer to...) Figure 7 As shown, the thickness of the auxiliary layer 7 ranges from 0.3 to 30 mm, specifically any value among 0.3 mm, 4.5 mm, 10 mm, 15 mm, 20 mm, and 30 mm, or a value between any two of these values. The first through hole 401 contacts the conductive busbar 3 through the auxiliary layer 7, and this contact includes bonding, welding, or pressing. In this embodiment, the conductive busbar 3 and the first sealing element 4 are spaced apart by the auxiliary layer 7 to prevent the force of the conductive busbar 3 from being directly transmitted to the first sealing element 4 during vibration, thereby reducing the impact of the vibration of the conductive busbar 3 on the first sealing element 4 and improving the sealing effect. The thickness of the auxiliary layer 7 is the distance between the first through hole 401 and the conductive busbar 3. If the thickness of the auxiliary layer 7 is too small, the reduction in vibration force on the conductive busbar 3 will not be significant; if the thickness of the auxiliary layer 7 is too large, the connecting channel 201 on the first partition 2 will be too large, resulting in poor strength of the first partition 2. The thickness of the auxiliary layer 7 is set within the aforementioned range to ensure both vibration damping and the strength of the first partition 2. The auxiliary layer 7 is made of heat-insulating and / or insulating material. The material of the auxiliary layer 7 can be non-metallic materials such as thermoplastic elastomer (TPE), polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyethylene terephthalate (PET), and polytetrafluoroethylene (PTFE), and is applied by bonding or compression. The auxiliary layer 7 can also be a metallic material layer. A flexible insulating layer, such as a rubber layer, needs to be provided on the surface of the metallic material layer near the conductive busbar 3. The auxiliary layer 7 is then welded to the conductive busbar 3.

[0070] Specifically, the auxiliary layer 7 is at least disposed on the outer surface of the portion of the conductive busbar 3 that passes through the connecting channel 201. The auxiliary layer 7 is sealed to the surface of the conductive busbar 3, thereby reducing the impact of the vibration of the conductive busbar 3 on the first seal 4 and ensuring the sealing effect of the first seal 4.

[0071] In another embodiment, the first sealing member 4 is provided with a first through hole 401 for the conductive busbar 3 to pass through. Along a direction perpendicular to the second direction, the outer side of the first sealing member 4 abuts against the inner surface of the connecting channel 201, and the wall of the first through hole 401 is in direct contact with the conductive busbar 3. That is, no auxiliary layer 7 is provided between the first sealing member 4 and the conductive busbar 3. In this embodiment, 1 ≤ L × d / h ≤ 195. Because no auxiliary layer 7 is provided between the first sealing member 4 and the conductive busbar 3, the cross-sectional area of ​​the connecting channel 201 along the first direction can be reduced, thereby improving the strength of the first partition 2. The first direction is the extension direction of the first partition 2.

[0072] To improve sealing performance while avoiding affecting the arrangement of battery cells 6, refer to Figure 8 The distance by which the end of the first sealing element 4 near the electrical compartment 102 protrudes from the surface of the first partition 2 is a first distance h1mm. The range of the first distance h1mm is 0.5~7mm, specifically any value among 0.5mm, 1mm, 2mm, 4.5mm, 6.5mm, and 7mm, or a value between any two values. The aforementioned range of the first sealing element 4 protruding from the surface of the first partition 2 near the electrical compartment 102 improves the sealing effect while reducing interference between the first sealing element 4 and the installation of other components in the sub-battery compartment. If the value of h1 is too small, the protrusion distance of the first sealing element 4 is small, resulting in poor sealing; if the value of h1 is too large, the protrusion distance of the first sealing element 4 is large, affecting the installation of other electrical components in the electrical compartment 102.

[0073] In one possible embodiment, along the second direction, i.e., along the thickness direction of the first separator 2, the size of the first seal 4 is a mm, the size of the first separator 2 is b mm, and the a / b ratio ranges from 0.2 to 1.2, specifically any value among 0.2, 0.35, 0.6, 0.85, 1, and 1.2, or a value between any two values. Setting the a / b ratio within this range ensures good sealing performance while preventing the first seal 4 from being too long along the second direction, thus avoiding interference with the installation of other components. If the a / b ratio is too small, the sealing area is small, resulting in poor sealing performance; if the ratio is too large, the first seal 4 will protrude from the surface of the first separator 2, affecting the installation of other components within the battery pack. The a / b ratio is set within the above range, i.e., along the thickness direction of the first separator 2, such as... Figure 11 As shown, in the case where a / b is less than 1, the size of the first seal 4 is smaller than the size of the first partition 2, or, as... Figure 10As shown, in the case where a / b equals 1, the size of the first seal 4 is equal to the size of the first partition 2, or, as... Figure 9 As shown, in the case where a / b is greater than 1, the size of the first seal 4 is greater than the size of the first partition 2. Figure 9 , Figure 10 and Figure 11 All are partial cross-sectional structural schematic diagrams on the first partition 2. Here, amm ranges from 2 to 168 mm, specifically any value among 2mm, 20mm, 45mm, 85mm, 105mm, and 168mm, or a value between any two values. bmm ranges from 10 to 140 mm, specifically any value among 10mm, 35mm, 60mm, 90mm, 125mm, and 140mm, or a value between any two values. The second direction is set along the thickness direction of the first partition 2, and the second direction intersects the first direction perpendicularly. It can be understood that the first sealing element 4 is at least partially disposed within the connecting channel 201 to seal the gap between the conductive busbar 3 and the connecting channel 201.

[0074] In one specific embodiment, a connecting channel 201 is disposed at an adjacent position on the first partition 2 corresponding to the first and second sub-battery compartments, and two conductive busbars 3 extending from the first and second sub-battery compartments are spaced apart. In this embodiment, the orthographic projections of the first and second sub-battery compartments along the second direction on the first partition 2 at least partially overlap with the connecting channel 201, thereby facilitating the extension of the conductive busbars 3 from different sub-battery compartments. The conductive busbars 3 extending from two sub-battery compartments pass through a connecting channel 201, meaning that the closely positioned conductive busbars 3 from two different sub-battery compartments share a single connecting channel 201 extending into the electrical compartment 102. Figure 12 and Figure 13 As shown, Figure 12 A schematic diagram of installing the first seal 4 for the connecting channel 201. Figure 13This is a schematic diagram of the connecting channel 201 without the first seal 4 installed. The connecting channel 201 is equipped with a first seal 4, which surrounds the two conductive busbars 3, sealing the area around them. In this embodiment, a sub-battery compartment is provided on each side of the second partition 5. The shortest distance Lmm between adjacent conductive busbars 3 ranges from 20 to 150 mm, specifically any value from 20 mm, 50 mm, 75 mm, 100 mm, 125 mm, to 150 mm, or any value between any two. By setting Lmm within the above range, the probability of seal failure is reduced, ensuring the current-carrying capacity of the conductive busbars 3. If the value of L is too small, the two adjacent conductive busbars 3 are close together, resulting in concentrated vibration when the adjacent conductive busbars 3 vibrate, causing a greater impact on the first seal 4 and easily leading to seal failure. If the value of L is too large, the two adjacent conductive busbars 3 are far apart, resulting in a long current-carrying path for the conductive busbars 3 and poor current-carrying capacity of the battery assembly. Installation efficiency is improved by setting a first seal 4 around the two conductive busbars 3.

[0075] In another specific embodiment, the connecting channel 201 includes two, and the conductive busbars 3 corresponding to the first sub-battery compartment and the second sub-battery compartment are led out through different connecting channels 201, that is, each connecting channel 201 is used to pass through a conductive busbar 3, such as Figure 14As shown, a first sealing element 4 is provided in each connecting channel 201 to seal the gap around a conductive busbar 3. The first sealing element 4 has a second distance h2 from the side of the first partition 2 away from the bottom plate 101, where |h2-h|≤60mm. The height of the first partition 2 along the third direction is 80~140mm, specifically any value among 80mm, 95mm, 105mm, 120mm, 135mm, and 140mm, or a value between any two values. In this embodiment, one first sealing element 4 seals one conductive busbar 3, and the connecting channel 201 is opened relatively small to allow the conductive busbar 3 to pass through, avoiding the connection channel 201 being too large and affecting the strength of the first partition 2. The value of |h2-h| is set within the above range to prevent the first seal 4 from being too close to the bottom of the first separator 2, and also to prevent the first seal 4 from being too close to the top of the first separator 2. This reduces the impact of high-temperature gas accumulating at the top of the battery pack during thermal runaway on the first seal 4, preventing the first seal 4 from failing to seal, and also prolonging the time for high-temperature gas to enter other sub-battery compartments after seal failure. The top and bottom of the first separator 2 are the top and bottom surfaces of the first separator 2 along a third direction. If the first seal 4 is too close to the bottom of the first separator 2, the connecting channel 201 will be close to the bottom of the first separator 2, resulting in lower strength at the bottom of the first separator 2. This makes the bottom of the first separator 2 prone to cracking during foreign object impact or battery vibration, thus affecting the sealing performance. If the first seal 4 is too close to the top of the first separator 2, the first seal 4 is easily affected by the high-pressure gas during thermal runaway, causing the first seal 4 to fail to seal.

[0076] To reduce the weight of the battery pack, the first partition 2 has a cavity 202 extending in a first direction. The cavity 202 communicates with the connecting channel 201. The first seal 4 is at least partially located within the cavity 202. On the large surface (the surface with the largest area) of the first seal 4, the projected size of the first seal 4 is larger than the projected size of the connecting channel 201. Figure 16 and Figure 17 As shown, this improves the sealing effect and ensures that the end of the first sealing element 4, under the action of elastic deformation, presses against the wall of the connecting channel 201. Specifically, refer to... Figure 17 The distance cmm between the outer side of the first sealing element 4 and the wall of the connecting channel 201 ranges from 1 to 5 mm. This structural design allows the end of the first sealing element 4 to be pressed tightly within the connecting channel 201, and when a portion of the first sealing element 4 extends into the cavity 202, it improves the connection strength between the first sealing element 4 and the first partition plate 2, thus enhancing the sealing performance. If the value of c is too small, the distance the first sealing element 4 extends into the cavity 202 is too short, resulting in poor connection strength and sealing effect; if the value of c is too large, the first sealing element 4 becomes difficult to install.

[0077] When the cross-section of the conductive busbar 3 is rectangular or trapezoidal, such as Figure 14 As shown, the distance between the large surface (the surface with the largest area) of the conductive busbar 3 and the corresponding edge of the first sealing element 4 is m, in mm. Figure 14 As shown, the spacing m mm ≥ 1.5 mm. The large surface of the conductive busbar 3 generates a large amount of heat. To reduce the impact of heat on the first seal 4, it is necessary to increase the spacing between the large surface of the conductive busbar 3 and the corresponding edge of the first seal 4. Therefore, it is necessary to limit the minimum value of m mm, which is greater than or equal to 1.5 mm, to ensure the sealing effect of the first seal 4.

[0078] For ease of connection, the conductive busbar 3 includes at least one bent section located in the electrical compartment 102. The bent section comprises a straight section and an angular section. Along the second direction, the minimum distance between the straight section and the first seal 4 is x mm. Figure 18 As shown, x mm ranges from 5 to 75 mm, specifically any value among 5 mm, 25 mm, 40 mm, 50 mm, 65 mm, and 75 mm, or a value between any two values. Setting x within this range reduces the impact of vibration on the first seal 4 and facilitates bending of the conductive busbar 3. If the value of x is too large, the minimum distance from the bending point of the bending section to the first seal 4 is too large, the cantilever of the conductive busbar 3 is too long, the vibration impact is greater, and the sealing of the first seal 4 is worse. If the distance is too small, bending of the conductive busbar 3 becomes difficult. The bending section includes one or more bends.

[0079] In one embodiment, the conductive busbar 3 includes a through section passing through the connecting channel 201, and the plane containing the large surface (the surface with the largest area) of the through section is disposed perpendicular to the base plate 101, such as... Figure 19 As shown, the shortest distance Lmm between adjacent conductive busbars 3 in the two sub-battery compartments ranges from 20 to 400 mm, specifically any value among 20 mm, 100 mm, 155 mm, 200 mm, 280 mm, and 400 mm, or a value between any two values. When the large surface of the conductive busbar 3 is vertically aligned with the base plate 101, i.e., when it is vertically led out, its resistance to third-direction vibration is better. In this case, the value of Lmm can be reduced to decrease the length of the conductive busbar 3, thereby reducing the current path and improving the current carrying capacity.

[0080] Specifically, the first partition 2 includes a side end face perpendicular to the first direction, and the conductive busbar 3 includes a first bent portion disposed within the electrical compartment 102, such as... Figure 18 and Figure 20As shown, one end of the first bent portion is connected to the through section, and the other end is bent towards the side face of the first partition 2. The first bent portion includes a first r-angle 301 and a first straight section 302. The first straight section 302 can be parallel to the large surface of the first partition 2 or not parallel. Preferably, the first straight section 302 is parallel to the large surface of the first partition 2. To prevent the vibration of the first partition 2 from being directly transmitted to the conductive busbar 3, the large surface (the surface with the largest area) of the first straight section 302 is spaced apart from the first sealing member 4, so that the conductive busbar 3 does not directly contact the first partition. Since the r-angle position is where heat accumulates and the vibration impact is large, the orthographic projection of the first r-angle 301 on the large surface of the first partition 2 does not overlap with the first sealing member 4. Figure 20 As shown, this reduces the impact of the conductive busbar 3 on the first seal 4 during vibration, and also reduces the influence of heat from the first r-angle 301 region of the conductive busbar 3 on the first seal 4, thereby improving the sealing effect. Preferably, the first bent portion bends towards the side of the first partition 2 along the first direction, that is, the first straight section 302 extends along the first direction. The range of the first r-angle 301 is 3~10mm.

[0081] To ensure that the orthographic projection of the first r-angle 301 on the large surface of the first partition 2 does not overlap with the first seal 4, in one embodiment, the conductive busbar 3 includes a through section passing through the connecting channel 201, the through section being inclined, such as... Figure 20 As shown, the projection of the first r-angle 301 onto the first partition 2 does not overlap with the first seal 4. The distance between the first straight section 302 and the first seal 4 is 10~60mm, specifically any value among 10mm, 25mm, 30mm, 50mm, 55mm, and 60mm, or a value between any two values. In this embodiment, since the conductive busbar 3 is inclined through the through section of the connecting channel 201, the length of the conductive busbar 3 can be shortened, the current path reduced, and the current carrying capacity between battery packs improved. The distance between the first straight section 302 and the first seal 4 is controlled within the above range, which can reduce the impact of vibration and heat on the sealing of the first seal 4, and also ensure the current carrying capacity. If the distance between the first straight section 302 and the first seal 4 is too small, the vibration and heat of the first straight section 302 will easily affect the sealing effect of the first seal 4; if the distance between the first straight section 302 and the first seal 4 is too large, the length of the conductive busbar 3 will be too long, thereby extending the current path and resulting in poor current flow between battery packs.

[0082] To ensure that the orthographic projection of the first r-angle 301 on the large surface of the first partition 2 does not overlap with the first seal 4, in another embodiment, the conductive busbar 3 is positioned perpendicular to the surface with the largest area of ​​the first partition 2, passing through the connecting channel 201. Figure 18As shown, the orthographic projection of the first r-angle 301 on the first partition 2 is located within the first through hole 401 of the first sealing member 4 for the conductive busbar 3 to pass through. At this time, the through section is perpendicular to the first straight section 302. In this embodiment, it is easier to ensure the accuracy of the bending angle of the first bend, and the vibration resistance is better compared to the inclined setting. Moreover, the orthographic projection of the first straight section 302 on the large surface of the first partition 2 at least partially overlaps with the first sealing member 4. The distance between the first straight section 302 and the first sealing member 4 is 5~60mm, specifically any value among 5mm, 15mm, 30mm, 45mm, 50mm, and 60mm, or a value between any two values. By limiting the distance between the first straight section 302 and the first sealing member 4, the impact of vibration and heat of the first straight section 302 on the first sealing member 4 can be reduced, and the current carrying capacity can be ensured to be within a suitable range. If the distance between the first straight section 302 and the first seal 4 is too small, the heat and vibration of the first straight section 302 of the conductive busbar 3 will have a greater impact on the first seal 4, affecting the sealing effect; if the distance between the first straight section 302 and the first seal 4 is too large, the current path of the conductive busbar 3 will be too long, affecting the current flow between battery packs.

[0083] The orthographic projection of the first r-angle 301 on the large surface of the first partition 2 can at least partially overlap with the first sealing member 4. In this embodiment, the first partition 2 includes a side end face perpendicular to the first direction, and the conductive busbar 3 includes a first bent portion located in the electrical compartment 102. The first bent portion is disposed close to the first partition 2, one end of the first bent portion is connected to the through section, and the other end is bent toward the side end face of the first partition 2, such as... Figure 21 As shown. The first bending portion includes a first r-angle 301 and a first straight section 302. The large surface of the first straight section 302 can be parallel to the large surface of the first partition 2 or not parallel. Preferably, the large surface of the first straight section 302 is parallel to the large surface of the first partition 2. The orthographic projection of the first r-angle 301 on the large surface of the first partition 2 at least partially overlaps with the first sealing member 4. In this embodiment, the conductive busbar 3 is inclined through the through section of the connecting channel 201, and its inclination angle is small, so that the orthographic projection of the first r-angle 301 on the large surface of the first partition 2 at least partially overlaps with the first sealing member 4. Similarly, the first straight section 304 is spaced apart from the first sealing member 4. Along the second direction, the distance between the first straight section 304 and the first sealing member 4 is 12~75mm, specifically any value among 12mm, 24mm, 30mm, 45mm, 65mm, and 75mm, or a value between any two values. Preferably, the first bending portion bends towards the side end face of the first partition 2 along the first direction.

[0084] In the above embodiments, the end of the first bent portion away from the first partition 2 can continue to be bent along the second or third direction, which is not limited here. In the above embodiments, the range of the first r-angle 301 is 3~10mm.

[0085] The conductive busbar 3 includes a through section passing through the connecting channel 201, and the plane containing the large surface area (the surface with the largest area) of the through section is arranged parallel to the base plate 101, such as... Figure 12 As shown, in this embodiment, the shortest distance L mm between adjacent conductive busbars 3 in the two sub-battery compartments ranges from 40 to 700 mm, specifically any value among 40 mm, 100 mm, 200 mm, 350 mm, 550 mm, and 700 mm, or a value between any two values. The conductive busbar 3 extends parallel to the base plate 101 through the through-section of the connecting channel 201, making it easy to connect and fix the conductive busbar 3, but resulting in poor vibration resistance. Therefore, the value of L needs to be increased to reduce vibration concentration. In this embodiment, to reduce the vibration of the conductive busbar 3, the connection point of the conductive busbar 3 at the through-section is bent towards the base plate 101 to lower the center of gravity, and supports can be provided on the base plate 101 to alleviate the vibration of the conductive busbar 3. Furthermore, the connection point of the conductive busbar 3 at the through-section is bent towards the base plate 101 in a third direction.

[0086] When the plane of the through section of the conductive busbar 3 passing through the connecting channel 201 is parallel to the base plate 101, in one embodiment, the conductive busbar 3 includes a second bent portion disposed in the electrical compartment 102. One end of the second bent portion is connected to the through section, and the other end is bent towards the base plate 101. The second bent portion is disposed near the first partition 2, and the second bent portion includes a second r-angle 303 and a first vertical section 304. The plane of the large surface of the first vertical section 304 is parallel to the large surface of the first partition 2, as shown below. Figure 22 and Figure 23 As shown. Similarly, the orthographic projection of the second r-angle 303 on the large surface of the first partition 2 may or may not overlap with the first seal 4. To reduce the impact of vibration, the first vertical section 304 is spaced apart from the first seal 4. The range of the second r-angle 303 is 3~10mm.

[0087] In one embodiment, the orthographic projection of the second r-angle 303 on the large surface of the first partition 2 does not overlap with the first seal 4. The first vertical segment 304 and the first seal 4 are spaced apart, with a spacing of 5-60 mm, specifically any value among 5 mm, 20 mm, 35 mm, 50 mm, 55 mm, and 60 mm, or a value between any two values. By limiting the spacing between the first vertical segment 304 and the first seal 4, the impact of vibration and heat from the first vertical segment 304 on the first seal 4 can be reduced, while ensuring that the current carrying capacity is within a suitable range. If the spacing between the first vertical segment 304 and the first seal 4 is too small, the heat and vibration of the first vertical segment 304 will have a greater impact on the first seal 4, affecting the sealing effect. If the spacing between the first vertical segment 304 and the first seal 4 is too large, the current carrying path of the conductive busbar 3 will be too long, affecting the current carrying capacity between battery packs. In a specific embodiment, such as... Figure 22 As shown, the orthographic projection of the second r-angle 303 on the large surface of the first partition 2 overlaps with the first through hole 401. In this embodiment, it is convenient to ensure the accuracy of the bending angle of the third bend, and the vibration resistance is better compared to the inclined setting. In another specific embodiment, the conductive busbar 3 includes a through section passing through the connecting channel 201, and the through section is inclined, such as... Figure 24 As shown, the inclination angle of the through section is large enough so that the orthographic projection of the second r angle 303 on the first partition plate 2 does not overlap with the first seal 4 and is far away from the first seal 4. Since the through section through which the conductive busbar 3 passes through the connecting channel 201 is inclined, the length of the conductive busbar 3 can be shortened, the current path can be reduced, and the current carrying capacity between battery packs can be improved.

[0088] In another embodiment, the orthographic projection of the second r-angle 303 onto the large surface of the first partition 2 at least partially overlaps with the first seal 4, such as... Figure 25 As shown, the first vertical section 304 and the first sealing element 4 are spaced apart, with a spacing of 12~75mm, specifically any value among 12mm, 20mm, 45mm, 60mm, and 75mm, or a value between any two values. In this embodiment, the conductive busbar 3 also includes a through section passing through the connecting channel 201, the through section being inclined, such as... Figure 25 As shown, its tilt angle is set such that the orthographic projection of the second r-angle 303 on the large surface of the first partition 2 at least partially overlaps with the first seal 4.

[0089] In other embodiments, when the plane of the large surface of the through section of the conductive busbar 3 passing through the connecting channel 201 is parallel to the base plate 101, the conductive busbar 3 may also be provided with two bends. Specifically, the conductive busbar 3 includes a third bend and a fourth bend disposed within the electrical compartment 102, such as... Figure 26As shown, the third bend is located between the through section and the fourth bend. The fourth bend is located at the end of the third bend away from the larger surface of the first partition 2. The minimum distance f (mm) between the fourth bend and the base plate 101 ranges from 5 to 70 mm, specifically any value among 5 mm, 20 mm, 45 mm, 55 mm, and 70 mm, or a value between any two of these. Preferably, along the third direction, the height of the fourth bend is lower than the height of the third bend. The fourth bend is parallel to the base plate 101. The minimum distance f between the fourth bend and the base plate 101 is set within the above range, which can avoid the conductive busbar 3 being too close to the base plate 101, causing insulation failure, and also avoid stress concentration at the bending position due to the short lengths of the two bends. If the value of f is too small, the conductive busbar 3 will be too close to the bottom plate 101 of the housing 1, and the conductive busbar 3 will easily come into contact with the bottom plate 101 and cause insulation failure; if the value of f is too large, the length of the two bends will be too short, and the bends will easily break due to stress concentration.

[0090] Specifically, refer to Figure 26 The third bending portion includes a third r-angle 305 and a second vertical segment 306, and the fourth bending portion includes a fourth r-angle 307 and a second straight segment 308. The second straight segment 308 is arranged parallel to the base plate 101. One end of the second vertical segment 306 is the third r-angle 305, and the other end is the fourth r-angle 307. The range of the third r-angle 305 and the fourth r-angle 307 is 3~10mm.

[0091] To reduce stress concentration, the range of each of the above-mentioned r-angles is 3~10mm. Setting the r-angle within this range ensures current carrying capacity, effectively avoids stress concentration at the r-angle position, and prevents tip discharge at the r-angle position. If the r-angle is too large, the current carrying path is longer and the current carrying capacity is worse. If the r-angle is too small, the stress is more concentrated, making it easy to break, and tip discharge is more likely to occur at the r-angle, leading to insulation failure.

[0092] In the above embodiments, the r-angle, i.e. the rounded corner, is designed with a rounded corner structure at the bend, which helps to reduce stress concentration during bending and lower the probability of breakage.

[0093] When the plane of the large surface of the through section of the conductive busbar 3 passing through the connecting channel 201 is perpendicular to the bottom plate 101, and the conductive busbar 3 has at least two bends on the side near the electrical compartment 102, in one case, one conductive busbar 3 is provided at a position close to each other in the first sub-battery compartment and the second sub-battery compartment. The bends of the two conductive busbars 3 near the large surface of the first partition 2 are bent in the first direction, and the bending directions are opposite. (Refer to...) Figure 27As shown, the bent portions of the two conductive busbars 3 closest to the large surface of the first separator 2 are further apart along the first direction. The distance between the ends of the two conductive busbars 3 furthest from the first separator 2 is L1mm, and the range of L1-L is 10~980mm. Setting the value of L1-L within the above range can ensure the current carrying capacity of the conductive busbars 3 while reducing stress concentration at the bending position. The range of L1mm is 300~1000mm, and the range of Lmm is 20~400mm. If the value of L1-L is too large, the current carrying path of the conductive busbar 3 is long, the internal resistance of the current carrying capacity is large, and the current carrying capacity between battery packs is poor; if the value is too small, the length of each bend is short, the stress at the bending position is more concentrated, and it is easy to cause the conductive busbar 3 to break.

[0094] In the second scenario, a conductive busbar 3 is installed at a position close to the first and second sub-battery compartments. The bent portions of the two conductive busbars 3 near the large surface of the first partition 2 are bent along the first direction, and the bending directions are opposite to each other. (Refer to...) Figure 28 The two conductive busbars 3, closest to the large surface of the first partition 2, are bent close together along the first direction. The distance between the ends of the two conductive busbars 3 furthest from the first partition 2 is L2mm, and the range of L-L2 is 15~390mm. Setting the value of L-L2 within the above range can reduce stress concentration at the bending position and avoid collision between the ends of the two conductive busbars 3 during vibration. If the value of L-L2 is too large, the length of the bending part is too short, the stress at the bending position is more concentrated, and it is easy to cause the conductive busbar 3 to break. If the value is too small, the two conductive busbars 3 are prone to interference during vibration. The range of L2mm is 5~100mm, and the range of Lmm is 20~400mm.

[0095] In the third scenario, a conductive busbar 3 is installed at a position close to the first and second sub-battery compartments. The bent portion of the conductive busbar 3 near the large surface of the first partition 2 is bent along the first direction, and the bending direction is the same. (Refer to...) Figure 29 As shown, the distance between two adjacent r-angles is L3mm, and the range of L3mm is 5~10mm. Setting L3mm within the above range can avoid excessive stress concentration caused by two adjacent bending parts being too close together during bending, and at the same time reduce the probability of interference between two adjacent conductive busbars 3. If the value of L3 is too small, the stress at the bending part will be too concentrated; if the value is too large, the two conductive busbars 3 are prone to interference.

[0096] To achieve weight reduction, a cavity 202 extending along a first direction is provided inside the first partition 2. To prevent thermal runaway gas from interfering with the seal and causing failure, or to prevent seal failure due to cracks or defects in the first partition 2, a sealing layer 8 is provided inside the cavity 202. The sealing layer 8 is provided on at least both sides of the connecting channel 201 along the first direction. (Refer to...) Figure 30 and Figure 31 As shown, the dimensions of the sealing layer 8 along the second direction correspond to the dimensions of the cavity 202 along the second direction. The sealing layer 8 divides the cavity 202 into a first sub-cavity and a second sub-cavity. The first sub-cavity and the second sub-cavity are not connected. The first sub-cavity is connected to the connecting channel 201, while the second sub-cavity is not connected to the connecting channel 201. Therefore, even if the seal at the first sealing element 4 fails, the gas can only remain in the first sub-cavity and will not enter the second sub-cavity, achieving a double-layer seal and improving the sealing effect. In one embodiment, as... Figure 30 As shown, the sealing layer 8 extends along a third direction, and two sealing layers 8 are provided. The two sealing layers 8 are disposed on both sides of the communicating channel 201 along the first direction, thereby dividing the cavity 202 into two sub-cavities. In another embodiment, the sealing layer 8 may also surround the communicating channel 201 to divide the cavity 202 into two sub-cavities.

[0097] When the first partition 2 has a cavity 202 extending in the first direction, it will affect the structural strength of the first partition 2. In order to improve the structural strength of the first partition 2 with the cavity 202, the first partition 2 also includes a partition rib 203 extending in the first direction, such as... Figure 32 As shown, multiple partition ribs 203 can be provided, thereby dividing the cavity 202 into multiple sub-cavities. The partition ribs 203 are spaced apart from the first sealing element 4, with a spacing of e mm, where e mm ranges from 2 to 30 mm. The partition ribs 203 are directly stressed when the first partition plate 2 is under pressure, which may cause deformation and affect the sealing of the first sealing element 4. The spacing e between the partition ribs 203 and the first sealing element 4 is set within the aforementioned range to avoid the deformation of the partition ribs 203 affecting the sealing effect of the first sealing element 4, while ensuring the strength of the first partition plate 2 at the sealing point of the first sealing element 4. If the value of e is too small, the first sealing element 4 may fail to seal due to the influence of the partition ribs 203; if the value of e is too large, the strength of the first partition plate 2 at the first sealing element 4 will be low. Only one partition rib 203 can be provided; this is not limited here.

[0098] To improve the sealing effect, the distance between the first seal 4 and the end of the first partition 2 along the first direction is M mm, and the dimension of the first seal 4 along the first direction is N mm, with N / M ≥ 0.42~2. The larger M mm is, the closer the first seal 4 is to the center of the first partition 2 along the first direction, and the closer the two conductive busbars 3 of the two sub-battery compartments are. If the first seal 4 fails, crosstalk of thermal runaway gas is more likely to occur. To improve the sealing effect of the first seal 4, the dimension N mm along the first direction needs to be increased to improve sealing performance. If the value of N / M is too small, the sealing performance is poor, so it needs to be limited. Specifically, M mm ranges from 30 to 70 mm, and N mm ranges from 30 to 60 mm. Figure 12 As shown, this is the case where two conductive busbars 3 share a first seal 4. When each conductive busbar 3 is sealed with a first seal 4, Nmm is the dimension of a first seal 4 along the first direction.

[0099] To improve grouping efficiency, the connecting channel 201 is a slot provided on the surface of the first partition 2 away from the bottom plate 101, such as... Figure 33 As shown, the opening of the connecting channel 201 away from the bottom plate 101 is sealed by the second sealing member 9. The second sealing member 9 is connected to the surface of the first partition 2 away from the bottom plate 101 and is used to limit the surface of the conductive busbar 3 away from the bottom plate 101. At this time, 0.4≤L×d / h≤180. The dimension of the second sealing member 9 along the third direction is d1mm. The conductive busbar 3 is disposed in the top opening of the first sealing member 4 away from the bottom plate 101, and the second sealing member 9 is pressed against the top surface of the conductive busbar 3. When the connecting channel 201 has the above structure, the conductive busbar 3 away from the bottom plate can be sealed by the second sealing member 9 at the top of the first partition 2, improving the grouping efficiency. However, since the connecting channel 201 is an opening located on the first partition 2 away from the bottom plate 101, the vibration amplitude of the conductive busbar 3 is large during vibration, which has a large impact on the first sealing member 4 and is prone to sealing failure. Therefore, the value of d1mm needs to be increased to reduce the risk of sealing failure. Specifically, d1mm ≥ 2.5mm, and the specific value should be selected according to actual needs.

[0100] In another embodiment, the connecting channel 201 is a second through hole located on the first partition 2, with the second through hole positioned at the center of the first partition 2. The second distance h2mm between the first sealing member 4 and the surface of the first partition 2 away from the bottom plate 101 ranges from 10 to 80mm. The connecting channel 201 is positioned at the center of the first partition 2 to prevent the conductive busbar 3 from being too far from the bottom of the first partition 2, which could cause a large impact during vibration and affect the seal. If h2mm is too small, the vibration of the conductive busbar 3 will have a large impact on the seal, easily leading to seal failure. If h2mm is too large, it will affect the cross-sectional area of ​​the connecting channel 201, thereby affecting the current flow.

[0101] The battery pack comprises multiple battery cells 6. The charging time for each battery cell 6 from 0% SOC to 80% SOC is ≤20 minutes, and the length (Lmm) ranges from 20 to 300 mm. To meet fast charging requirements, the current path cannot be too long, thus requiring a reduction in the current resistance, which necessitates limiting the range of Lmm.

[0102] The housing 1 also includes a second partition 5, which is positioned between the first and second sub-battery compartments to separate them. The distance between the side of the second partition 5 furthest from the bottom plate 101 and the bottom plate 101 is greater than the distance between the side of the connecting channel 201 furthest from the bottom plate 101 and the bottom plate 101, meaning the height of the second partition 5 is higher than the connecting channel 201. This prevents gas from entering adjacent sub-battery compartments after a seal failure, thus improving sealing performance. In this embodiment, 1.2 ≤ L × d / h ≤ 70.

[0103] In one embodiment, the first sub-battery compartment includes a first battery cell, and the second sub-battery compartment includes a second battery cell. The positive electrode materials of the first and second battery cells are each selected from at least one of the following: lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel manganese oxide, lithium manganese iron phosphate, sodium-containing layered transition metal oxides, sodium-containing Prussian blue analogs, sodium-containing polyanionic compounds, or sodium-containing tunnel oxides. The positive electrode of the first battery cell includes at least one of sodium-containing layered transition metal oxides, sodium-containing Prussian blue analogs, sodium-containing polyanionic compounds, or sodium-containing tunnel oxides, and the second battery cell includes lithium iron phosphate.

[0104] The preparation method of battery cell 6 includes: (1) Preparation of positive electrode sheet: The positive electrode active material, conductive agent acetylene black, and binder PVDF are mixed, and solvent NMP is added. The mixture is stirred under vacuum stirring until the system is homogeneous to obtain positive electrode slurry. The positive electrode slurry is uniformly coated on both surfaces of the positive electrode current collector aluminum foil, dried at room temperature, and then transferred to an oven for further drying. The positive electrode sheet is then obtained by cold pressing and slitting. Specifically, the mass ratio of positive electrode active material: conductive agent: binder satisfies (92~98): (4~1): (4~1). (2) Preparation of negative electrode sheet: The negative electrode active material, conductive agent acetylene black, thickener CMC, and binder SBR are mixed, and solvent deionized water is added. The mixture is stirred under vacuum stirring until the system is homogeneous to obtain negative electrode slurry. The negative electrode slurry is uniformly coated on both surfaces of the negative electrode current collector copper foil, dried at room temperature, and then transferred to an oven for further drying. The negative electrode sheet is then obtained by cold pressing and slitting. The mass ratio of negative electrode active material: conductive agent: thickener: binder satisfies (90~96): (4~2): (2~1): (4~1). (3) Preparation of electrolyte: Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) are mixed in a volume ratio of 1:1:1 to obtain an organic solvent. Then, fully dried lithium salt LiPF6 is dissolved in the mixed organic solvent to prepare an electrolyte with a concentration of 1 mol / L. (4) Preparation of separator: Polyethylene membrane is selected as the separator. (5) Preparation of lithium-ion battery: The above positive electrode, separator, and negative electrode are stacked in sequence, wound or stacked to obtain a bare cell; the bare cell is placed in the outer packaging shell, dried, injected with electrolyte, and then encapsulated, left to stand, formed, and calibrated to obtain a lithium-ion battery.

[0105] In the above preparation methods, the positive electrode active material can be selected from one or more lithium-containing positive electrode active materials, including lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate; the negative electrode active material can be selected from one or more negative electrode active main materials, such as artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate.

[0106]

[0107]

[0108] Table 1

[0109] Air tightness testing methods

[0110] For each of the examples and comparative examples in Table 1, the box containing the bottom plate is separated by the first partition to form a battery compartment and an electrical compartment. The battery compartment is separated into a first sub-battery compartment and a second sub-battery compartment by the second partition. The first partition is provided with a communication channel, and the conductive busbars of the first sub-battery compartment and the conductive busbars of the second sub-battery compartment are introduced into the electrical compartment through the communication channel and sealed by the first seal. The distance between the conductive busbars of the adjacent first sub-battery compartment and the conductive busbars of the second sub-battery compartment is L mm, the distance between the first seal and the bottom plate is h mm, and the minimum distance between the surface of the first seal close to the conductive busbar and the surface away from the conductive busbar is d mm. As shown in Table 1, the remaining structures are the same. The electrical compartment is sealed with a box cover, and helium is filled into the electrical compartment with an inflation pressure of 3.65 ± 0.15 Kpa, and the maximum leakage at the sealing position between the box cover and the battery compartment is controlled to be ≤ 1 × 10 -5 mbar·L / s. The helium leakage at the conductive busbars corresponding to the first partition of the first sub-battery compartment and the second sub-battery compartment is tested with an ATH-3000G hydrogen-nitrogen leak detector. If the maximum leakage in the first sub-battery compartment and the second sub-battery compartment is ≤ 1 × 10 -4 mbar·L / s, it is qualified. If the maximum leakage is ≤ 1 × 10 -5 mbar·L / s, it is good; otherwise, it is unqualified.

[0111] Fast charging temperature test

[0112] For each embodiment and comparative example, 100 batteries were prepared according to the above battery preparation method. A housing including the base plate was divided into a battery compartment and an electrical compartment by a first partition. The battery compartment was then divided into a first sub-battery compartment and a second sub-battery compartment by a second partition. Fifty batteries were stacked into a group and placed on the base plate corresponding to the first sub-battery compartment, and connected in series by conductive busbars. The remaining 50 batteries were stacked into a group and placed on the base plate corresponding to the second sub-battery compartment, and connected in series by conductive busbars. The conductive busbars of the battery group in the first sub-battery compartment and the second sub-battery compartment were then connected in series. The conductive busbars of the battery pack in the sub-battery compartment are led out to the electrical compartment through the connecting channel on the first partition and connected in series. The conductive busbars are sealed to the first partition at the connecting channel by a first seal. At the connecting channel of the first partition, the distance between the conductive busbars of adjacent first and second sub-battery compartments is L mm, the distance between the first seal and the bottom plate is h mm, and the minimum distance between the surface of the first seal near the conductive busbar and the surface away from the conductive busbar is d mm, as shown in Table 1. All other characteristics are the same. First, the batteries in the first and second sub-battery compartments are discharged to the lower limit voltage at 0.33C, and then charged to the upper limit voltage at 4C. The temperature passing through the conductive busbars of the first partition is measured. If the temperature is greater than 60℃, it is unqualified; otherwise, it is qualified. When the main cathode material is lithium iron phosphate, the upper limit voltage is 3.65V and the lower limit voltage is 2.5V. When the active cathode material is a ternary nickel-cobalt-manganese material, the upper limit voltage is 4.25V and the lower limit voltage is 2.5V. In this test, the active cathode material was selected from a nickel-cobalt-manganese ternary LiNi... 0.6 Co 0.2 Mn 0.2 Taking O2 as an example, the mass ratio of positive electrode active material: conductive agent: binder satisfies 96:2:2; the negative electrode active material is selected from artificial graphite, and the ratio of negative electrode active material: conductive agent: thickener: binder satisfies 95:2:1:2.

[0113] This invention also provides an electrical device, including a battery pack, which is the aforementioned battery pack. The battery pack serves as the operating power source for the electrical device and can also act as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for vehicles. The electrical device encompasses numerous technical fields, including energy storage devices, electric ships, aircraft, laptops, power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, and aerospace.

[0114] 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.

[0115] 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.

[0116] The above description of the disclosed embodiments enables those skilled in the art to make or use the 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 invention. Therefore, the 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, which comprises a frame and a bottom plate. The frame and bottom plate are connected to form a receiving portion. A first partition is provided on the bottom plate, which divides the receiving portion into a sealed electrical compartment and a battery compartment. The battery compartment includes a first sub-battery compartment and a second sub-battery compartment arranged adjacent to each other along a first direction. The first and second sub-battery compartments are independently sealed. The electrical compartment and the battery compartment are arranged adjacent to each other along a second direction. A connecting channel is provided on the first partition for conductive busbars to pass through. The conductive busbars in the first and second sub-battery compartments extend into the electrical compartment through the connecting channel. The conductive busbars are sealed to the connecting channel by a first sealing member. Along a third direction, the distance between the first sealing member and the bottom plate is h mm. The shortest distance along the second direction between the adjacent conductive busbars in the first and second sub-battery compartments is L mm. Perpendicular to the second direction, the minimum distance between the surface of the first sealing member close to the conductive busbar and the surface far from the conductive busbar is d mm. The above parameters satisfy the formula 0.4≤L×d / h≤195. The third direction is the direction perpendicular to the base plate, and the first direction, the second direction, and the third direction are set perpendicular to each other.

2. The battery pack according to claim 1, characterized in that, The first sealing element is provided with a first through hole for the conductive busbar to pass through. Along the direction perpendicular to the second direction, the outer side of the first sealing element abuts against the inner surface of the connecting channel. The hole wall of the first through hole contacts the conductive busbar through an auxiliary layer. The thickness of the auxiliary layer is in the range of 0.3~30mm.

3. The battery pack according to claim 2, characterized in that, The auxiliary layer is at least disposed on the outer surface of the portion of the conductive bus that passes through the communication channel, and the auxiliary layer is sealed to the surface of the conductive bus.

4. The battery pack according to claim 1, characterized in that, The first sealing element is provided with a first through hole for the conductive busbar to pass through. Along the second direction perpendicular to the first sealing element, the outer side of the first sealing element abuts against the inner surface of the connecting channel, and the hole wall of the first through hole is in direct contact with the conductive busbar. 1≤L×d / h≤195.

5. The battery pack according to claim 4, characterized in that, The distance by which the end of the first seal protrudes from the surface of the first partition near the electrical compartment is a first distance h1 mm, and the range of the first distance h1 mm is 0.5~7 mm.

6. The battery pack according to claim 1, characterized in that, Along the thickness direction of the first partition, the size of the first seal is a mm, the size of the first partition is b mm, and the range of a / b is 0.2~1.

2.

7. The battery pack according to claim 1, characterized in that, The connecting channel is located at an adjacent position of the first partition corresponding to the first sub-battery compartment and the second sub-battery compartment. The two conductive busbars leading out from the first sub-battery compartment and the second sub-battery compartment extend into the electrical compartment through the connecting channel located at an adjacent position of the first sub-battery compartment and the second sub-battery compartment, and the two conductive busbars leading out from the first sub-battery compartment and the second sub-battery compartment are spaced apart. The connecting channel is provided with a first sealing element, and the first sealing element surrounds the outside of the two conductive busbars; The minimum distance L mm between adjacent conductive busbars ranges from 20 to 150 mm.

8. The battery pack according to claim 1, characterized in that, The communication channel includes two, and the conductive busbars corresponding to the first sub-battery compartment and the second sub-battery compartment are led out through different communication channels; The first seal has a second distance h2 mm from the side of the first partition away from the bottom plate, where |h2-h|≤60mm.

9. The battery pack according to claim 1, characterized in that, The range of d mm is 1~7mm.

10. The battery pack according to claim 1, characterized in that, The range of h mm is 10~80mm.

11. The battery pack according to claim 1, characterized in that, The first partition has a cavity extending in a first direction inside, the cavity is connected to the communication channel, and the first seal is located at least partially inside the cavity.

12. The battery pack according to claim 1, characterized in that, The range of L mm is 20~700mm.

13. The battery pack according to claim 1, characterized in that, The distance between the large surface of the conductive busbar and the edge of the corresponding side of the connecting channel is m, in mm, and the distance m mm ≥ 1.5 mm.

14. The battery pack according to claim 1, characterized in that, The conductive busbar includes at least one bent section located in the electrical compartment. The bent section includes a straight section and an r-angle section. Along the second direction, the minimum distance between the straight section and the first seal is x mm, where x mm ranges from 5 to 75 mm.

15. The battery pack according to claim 1, characterized in that, The conductive busbar includes a through section passing through the connecting channel. The plane containing the large surface of the through section is perpendicular to the base plate. The shortest distance L mm between adjacent conductive busbars in two sub-battery compartments ranges from 20 to 400 mm.

16. The battery pack according to claim 15, characterized in that, The first partition includes a side end face perpendicular to the first direction, and the conductive busbar includes a first bent portion located in the electrical compartment. One end of the first bent portion is connected to the through section, and the other end is bent toward the side end face. The first bend includes a first r-angle and a first straight section, the first straight section being spaced apart from the first seal; the orthographic projection of the first r-angle onto the large surface of the first partition does not overlap with the first seal.

17. The battery pack according to claim 15, characterized in that, The first partition includes a side end face perpendicular to the first direction, and the conductive busbar includes a first bent portion located in the electrical compartment. One end of the first bent portion is connected to the through section, and the other end is bent toward the side end face. The first bend includes a first r-angle and a first straight section, the first straight section being spaced apart from the first seal; the orthographic projection of the first r-angle onto the large surface of the first partition overlaps with the first seal, and along the second direction, the distance between the first straight section and the first seal is 12~75mm.

18. The battery pack according to claim 16 or 17, characterized in that, The range of the first r-angle is 3~10mm.

19. The battery pack according to claim 16, characterized in that, The orthographic projection of the first straight section onto the large surface of the first partition plate at least partially overlaps with the first seal, and the distance between the first straight section and the first seal along the second direction is 5~60mm.

20. The battery pack according to claim 1, characterized in that, The conductive busbar includes a through section passing through the connecting channel. The plane containing the large surface of the through section is parallel to the base plate. The shortest distance L mm between adjacent conductive busbars in two sub-battery compartments ranges from 40 to 700 mm.

21. The battery pack according to claim 20, characterized in that, The conductive busbar includes a second bent portion disposed in the electrical compartment, one end of which is connected to the through section, and the other end is bent toward the bottom plate; The second bend is disposed close to the first partition, and the second bend includes a second r-angle and a first vertical segment; The surface of the first vertical segment is parallel to the surface of the first partition plate. The range of the second r-angle is 3~10mm.

22. The battery pack according to claim 21, characterized in that, The orthographic projection of the second r-angle onto the large surface of the first partition does not overlap with the first seal. The first vertical segment and the first seal are spaced apart, with a spacing of 5~60mm.

23. The battery pack according to claim 21, characterized in that, The orthographic projection of the second r-angle onto the large surface of the first partition plate at least partially overlaps with the first seal. The first vertical segment and the first seal are spaced apart, with a spacing of 12~75mm.

24. The battery pack according to claim 20, characterized in that, The conductive busbar includes a third bend and a fourth bend disposed within the electrical compartment. The third bend is disposed between the through section and the fourth bend, and the fourth bend is disposed at the end of the third bend away from the large surface of the first partition. The minimum distance f mm between the fourth bend and the bottom plate ranges from 5 to 70 mm.

25. The battery pack according to claim 24, characterized in that, The third bend includes a third r-angle and a second vertical segment, and the fourth bend includes a fourth r-angle and a second straight segment. The range of the third or fourth r-angle is 3~10mm.

26. The battery pack according to claim 15, characterized in that, One of the conductive busbars is provided at a position close to each other in the first sub-battery compartment and the second sub-battery compartment. The bent portions of the large surfaces of the two conductive busbars near the first partition are bent in the first direction and the bending directions are opposite. The distance between the ends of the two conductive busbars away from the first partition is L1mm, and the range of L1-L is 10~980mm.

27. The battery pack according to claim 15, characterized in that, One of the conductive busbars is provided at a position close to each other in the first sub-battery compartment and the second sub-battery compartment. The bent portions of the large surfaces of the two conductive busbars near the first partition are bent along a first direction and the bending directions are opposite to each other. The distance between the ends of the two conductive busbars away from the first partition is L2mm, and the range of L-L2 is 15~390mm.

28. The battery pack according to claim 15, characterized in that, One of the conductive busbars is provided at a position close to each other in the first sub-battery compartment and the second sub-battery compartment. The bent portions of the large surfaces of the two conductive busbars near the first partition are bent in the first direction and the bending direction is the same. The distance between the ends of the two conductive busbars away from the first partition is L3mm, and the range of |L3mm is 5~10mm.

29. The battery pack according to claim 1, characterized in that, The first partition has a cavity extending in a first direction. A sealing layer is provided in the cavity. The sealing layer is provided on at least both sides of the communicating channel in the first direction. The sealing layer divides the cavity into a first sub-cavity and a second sub-cavity. The first sub-cavity and the second sub-cavity are not connected.

30. The battery pack according to claim 1, characterized in that, The first partition has a cavity extending in a first direction inside. The first partition also includes a partition rib extending in the first direction to divide the cavity into multiple sub-cavities. The partition rib is spaced apart from the first sealing element. The distance between the partition rib and the first sealing element is e mm, and e mm ranges from 2 to 30 mm.

31. The battery pack according to claim 1, characterized in that, The first partition includes a side end face perpendicular to the first direction, the distance between the first seal and the side end face is M mm, the dimension of the first seal along the first direction is N mm, and N / M≥0.42~2.

32. The battery pack according to claim 1, characterized in that, The connecting channel is a slot on the surface of the first partition away from the bottom plate. The opening of the connecting channel away from the bottom plate is sealed by a second sealing member. The second sealing member is connected to the surface of the first partition away from the bottom plate and is used to limit the surface of the conductive busbar away from the bottom plate. At this time, 0.4≤L×d / h≤180.

33. The battery pack according to claim 1, characterized in that, The connecting channel is a through hole structure located on the first partition, and the second distance h2mm between the first sealing element and the surface of the first partition away from the bottom plate ranges from 10 to 80mm.

34. The battery pack according to claim 1, characterized in that, The battery pack includes multiple battery cells, and the charging time of each battery cell from 0% SOC to 80% SOC is ≤20min, and the L mm range is 20~300mm.

35. The battery pack according to claim 1, characterized in that, It also includes a second partition, which is placed between the first sub-battery compartment and the second sub-battery compartment to separate the first sub-battery compartment and the second sub-battery compartment. The distance between the side of the second partition away from the bottom plate and the bottom plate is greater than the distance between the position of the connecting channel away from the bottom plate and the bottom plate.

36. The battery pack according to claim 35, characterized in that, 1.2≤L×d / h≤70.

37. An electrical device comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1-36.

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