A sealed battery box and battery pack

Abstract

This utility model relates to the field of energy storage technology, specifically disclosing a sealed battery box and battery pack, comprising: a base plate assembly; an outer frame assembly, the outer frame assembly being located above the edge of the base plate assembly, including a plurality of outer frame uprights connected in sequence to surround and form an internal space; wherein, the joint of adjacent outer frame uprights is coated with upright joint sealant; and an internal beam assembly, the internal beam assembly being located within the internal space and dividing the internal space into a plurality of sub-chambers; wherein, the bottom surfaces of both the outer frame assembly and the internal beam assembly are coated with a frame beam sealant layer to prevent liquid flow. The sealed battery box and battery pack provided by this utility model can effectively improve the sealing performance of the battery pack, reduce the risk of liquid ingress caused by bumps, vibrations, or impacts from foreign objects, thereby improving the safety and reliability of the battery pack.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, the safety and reliability of power batteries, as core components, are of paramount importance. The battery housing, as the main load-bearing structure of the battery pack, is typically divided into an electronic control compartment and a battery compartment: the electronic control compartment houses the battery management system (BMS), battery distribution unit (BDU), and other electronic control components, while the battery compartment houses the battery modules. To ensure the safe operation of the battery pack, both the electronic control compartment and the battery compartment must possess excellent airtightness to prevent the intrusion of moisture, dust, or other foreign objects from the external environment, avoiding safety hazards such as short circuits and thermal runaway. Excellent airtightness is particularly crucial for the battery compartment.

[0003] In actual use, the battery compartment often experiences seal failure due to bumps and vibrations during vehicle operation, impacts from road debris, or extreme environmental conditions (such as wading through water, rain, or snow), leading to liquid ingress. Since the battery compartment typically houses high-voltage battery modules, liquid ingress can cause decreased insulation performance, partial short circuits, or even thermal runaway, seriously threatening the safety of the vehicle and its occupants. Furthermore, the complex internal space of the battery compartment makes it difficult to quickly drain or dry liquid after it enters, further exacerbating the safety risks.

[0004] Therefore, existing battery enclosures need to be improved to enhance the sealing of the battery pack, reduce the risk of liquid ingress caused by bumps, vibrations, or impacts from foreign objects, and thus improve the safety and reliability of the battery pack.

[0005] The information disclosed in this background section is included only to enhance the understanding of the context of this disclosure, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] One objective of this invention is to provide a sealed battery box and battery pack that can effectively improve the sealing performance of the battery pack, reduce the risk of liquid ingress caused by bumps, vibrations, or impacts from foreign objects, and thus improve the safety and reliability of the battery pack.

[0007] To achieve the above objectives, this utility model provides a sealed battery box, comprising:

[0008] include:

[0009] Base plate assembly;

[0010] The outer frame assembly is located at the edge above the base plate assembly and includes a plurality of outer frame uprights connected in sequence to surround and form the internal space of the box.

[0011] The box-inner beam assembly is located within the box-inner space and divides the box-inner space into several sub-chambers; wherein, the bottom surfaces of both the outer frame assembly and the box-inner beam assembly are coated with a frame beam sealant layer to prevent liquid flow.

[0012] Optionally, each of the outer frame uprights includes a front outer frame upright located at the front end of the base plate assembly, a rear outer frame upright located at the rear end of the base plate assembly, and two side outer frame uprights located between the front outer frame upright and the rear outer frame upright.

[0013] The joint of two adjacent outer frame panels is coated with panel joint sealant;

[0014] Each of the sub-chambers includes a front electrical control compartment near the front outer frame upright plate, a rear electrical control compartment near the rear outer frame upright plate, and a battery compartment located between the two electrical control compartments.

[0015] Optionally, the internal beam assembly includes a front end crossbeam that is disposed opposite to the front end outer frame upright plate and cooperates with the front end outer frame upright plate to form the front end electrical control compartment, a rear end crossbeam that is disposed opposite to the rear end outer frame upright plate and cooperates with the rear end outer frame upright plate to form the rear end electrical control compartment, and a plurality of intermediate beams located between the front end crossbeam and the rear end crossbeam.

[0016] Each of the intermediate beams divides the battery compartment between the front end crossbeam and the rear end crossbeam into several battery sub-compartments.

[0017] Optionally, the frame beam sealant layer on the bottom surface of the front end crossbeam and the rear end crossbeam overflows toward the battery compartment to form an inner overflow bottom edge, and the overflow distance of the inner overflow bottom edge is a, 1mm≤a≤2mm;

[0018] The sealing adhesive layer on the bottom surface of the front and rear crossbeams overflows towards the corresponding electrical control compartment to form an overflow bottom edge, and the overflow distance of the overflow bottom edge is b, 0.5mm≤b≤5mm.

[0019] Optionally, the two ends of the front end beam and the rear end beam are welded to the corresponding side outer frame uprights.

[0020] Optionally, the side frame upright includes a side plate body and several reinforcing plates;

[0021] The reinforcing plate is provided between both end crossbeams and the side outer frame uprights;

[0022] The reinforcing plate is welded to the side outer frame upright plate, and is also welded to the corresponding front end crossbeam or rear end crossbeam.

[0023] Optionally, the upper part of the end face of both end beams is provided with an upward-facing opening that connects to the corresponding end notch of the electrical control compartment;

[0024] The vertical joint between the end notch and the side outer frame upright plate, as well as the joint between the lower part of the two end crossbeams and the side outer frame upright plate, are all non-welded edges and are coated with beam joint sealant.

[0025] The horizontal joint between the end notch and the side outer frame plate, as well as the joint between the middle of the two end beams and the side outer frame plate, are all welded edges and are welded to the side outer frame plate using solder.

[0026] Optionally, the base plate assembly includes a liquid cooling plate located below the sealant layer of the frame beam, and a bottom protective plate fixed to the bottom of the liquid cooling plate;

[0027] The liquid cooling plate is fastened to the outer frame assembly and / or the inner beam assembly by cold plate fasteners;

[0028] The bottom guard plate is provided with a guard plate clearance hole corresponding to the position of the cold plate fastener for accommodating the head of the cold plate fastener; the guard plate clearance hole is provided with head sealant that covers the head of the cold plate fastener and fills the guard plate clearance hole.

[0029] Optional, also includes:

[0030] Several box cover fixing brackets, each of which is fixed to the top of the box inner beam assembly;

[0031] A box cover assembly is provided above the bottom plate assembly and the box inner beam assembly, and the middle position of the box cover assembly is locked to each of the box cover fixing brackets by a number of box cover fasteners.

[0032] An annular sealing ring is provided between the box cover assembly and the box cover fixing bracket for the box cover fastener to pass through;

[0033] Both the lid assembly and the base plate assembly are provided with sealing gaskets between themselves and the outer frame assembly.

[0034] On the other hand, a battery pack is provided, including the sealed battery box, a battery module located in the middle of the sealed battery box, and an electronic control component located at the end of the sealed battery box.

[0035] The beneficial effects of this utility model are as follows: It provides a sealed battery box and battery pack. By setting a frame beam sealing adhesive layer on the bottom surface of both the outer frame assembly and the inner beam assembly, the battery compartment is divided into multiple independent sub-chambers. This innovative partition design can effectively limit the range of liquid diffusion even in extreme situations that lead to local liquid ingress, avoid chain reactions caused by liquid flow, and significantly reduce the risk of local short circuits or thermal runaway.

[0036] Therefore, the sealed battery box and battery pack provided by this utility model can effectively improve the sealing performance of the battery pack, reduce the risk of liquid ingress caused by bumps, vibrations or foreign object impacts, and thus improve the safety and reliability of the battery pack. Attached Figure Description

[0037] 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.

[0038] Figure 1 An exploded view of a sealed battery box provided for an embodiment (battery modules and electronic control components are not shown).

[0039] Figure 2 A schematic diagram of the structure of the sealed battery box provided in the embodiment;

[0040] Figure 3 A schematic diagram of the mounting structure of the base plate assembly provided in the embodiment;

[0041] Figure 4 A schematic diagram of the installation structure of the box cover assembly provided in the embodiment;

[0042] Figure 5 This is a schematic diagram of the structure of the overflow bottom edge provided in the embodiment.

[0043] In the picture:

[0044] 1. Base plate assembly; 101. Liquid cooling plate; 102. Base protective plate; 1021. Protective plate clearance hole;

[0045] 2. Outer frame assembly; 201. Front outer frame upright plate; 202. Rear outer frame upright plate; 203. Side outer frame upright plate; 2031. Side plate body; 2032. Reinforcing plate; 204. Upright plate joint sealant; 205. Front electrical control compartment; 206. Rear electrical control compartment; 207. Battery compartment;

[0046] 3. Box girder assembly; 301a. Front end crossbeam; 301b. Rear end crossbeam; 3011. End notch; 302. Middle girder; 303. Frame beam sealant layer; 3031. Inner overflow bottom edge; 3032. Outer overflow bottom edge;

[0047] 4. Cold-rolled steel plate fasteners;

[0048] 5. Head sealant;

[0049] 6. Sealant for beam joints;

[0050] 7. Solder;

[0051] 8. Box lid fixing bracket;

[0052] 9. Box lid assembly;

[0053] 10. Annular sealing ring;

[0054] 11. Sealing gaskets;

[0055] 12. Box cover fasteners. Detailed Implementation

[0056] In this utility model, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this utility model. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0057] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0058] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0059] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0060] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0061] Similar to the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0062] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0063] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0064] This invention provides a sealed battery box and battery pack, which effectively solves the problems of sealing failure and liquid ingress risk mentioned in the background art through structural optimization.

[0065] See Figure 1 and Figure 2 The battery pack provided in this embodiment includes a sealed battery box, a battery module located in the middle of the sealed battery box, and electronic control components (such as BMS components, BDU components, Hall sensors, fuses, etc.) located at the ends of the sealed battery box.

[0066] Specifically, the sealed battery box includes:

[0067] Base plate assembly 1;

[0068] The outer frame assembly 2 is located at the edge above the bottom plate assembly 1 and includes a plurality of outer frame uprights connected in sequence to surround and form the internal space of the box; wherein, two adjacent outer frame uprights are welded together and the joint is coated with upright joint sealant 204.

[0069] The box beam assembly 3 is located within the box space and divides the box space into several sub-chambers;

[0070] Both the outer frame assembly 2 and the inner beam assembly 3 are coated with a frame beam sealant layer 303 on their bottom surfaces to prevent liquid flow.

[0071] The sealed battery box and battery pack provided in this embodiment adopt a dual sealing protection mechanism:

[0072] First, apply joint sealant 204 to the joints of adjacent outer frame panels. This design directly addresses the bumps, vibrations, and extreme environmental conditions commonly encountered during vehicle operation. By filling the joint gaps with an elastic sealing material, it can absorb mechanical stress, enhance the structural rigidity and connection strength at the joints, prevent joint cracking, and maintain sealing performance over a long period of time. This blocks the path for external moisture, dust, and other foreign objects to enter the battery compartment 207 from the joints of the enclosure, ensuring that the enclosure achieves an IP protection rating of waterproof and dustproof.

[0073] Secondly, by applying a frame beam sealant layer 303 to the bottom surfaces of both the outer frame assembly 2 and the inner beam assembly 3, the tiny gaps and discontinuities connecting them to the base plate assembly 1 can be sealed, ensuring the airtightness of the entire battery box. This helps prevent humid air from entering and causing condensation inside the battery box, affecting electrical insulation or corroding internal components, and also helps maintain the sealing of the cooling circuit. Furthermore, when the sealed battery box is used in new energy vehicles, the outer frame assembly 2 and the inner beam assembly 3 are the areas closest to the ground and most susceptible to corrosive substances such as water splashed from the road, de-icing agents (salt), mud, and oil. The sealant applied to the bottom surfaces of these two components forms a dense protective layer, isolating corrosive media from direct contact with the metal outer frame assembly 2 and the inner beam assembly 3, significantly improving corrosion resistance and extending the battery pack's lifespan. The battery compartment 207 is divided into multiple independent sub-chambers. This innovative partitioning design can effectively limit the range of liquid diffusion even in extreme situations that lead to local liquid ingress, avoid chain reactions caused by liquid flow, and significantly reduce the risk of local short circuits or thermal runaway.

[0074] The joint sealant 204 for the vertical panels and the sealant layer 303 for the frame beams work together to build a complete protection system from two dimensions: blocking external intrusion and internal diffusion. This not only improves the overall sealing reliability of the battery box under complex working conditions, but also significantly reduces the severity of liquid ingress accidents through the partitioned isolation design. This comprehensively improves the safety and reliability of the battery pack, and solves the problem of insufficient sealing performance of existing battery packs that leads to safety hazards.

[0075] Therefore, the sealed battery box and battery pack provided by this utility model can effectively improve the sealing performance of the battery pack, reduce the risk of liquid ingress caused by bumps, vibrations or foreign object impacts, and thus improve the safety and reliability of the battery pack.

[0076] In this embodiment, each of the outer frame uprights includes a front outer frame upright 201 located at the front end of the base plate assembly 1, a rear outer frame upright 202 located at the rear end of the base plate assembly 1, and two side outer frame uprights 203 located between the front outer frame upright 201 and the rear outer frame upright 202.

[0077] Each of the sub-chambers includes a front electrical control compartment 205 near the front outer frame upright plate 201, a rear electrical control compartment 206 near the rear outer frame upright plate 202, and a battery compartment 207 located between the two electrical control compartments.

[0078] Furthermore, the internal beam assembly 3 includes a front end crossbeam 301a that is disposed opposite to the front end outer frame upright plate 201 and cooperates with the front end outer frame upright plate 201 to surround and form the front end electrical control compartment 205, a rear end crossbeam 301b that is disposed opposite to the rear end outer frame upright plate 202 and cooperates with the rear end outer frame upright plate 202 to surround and form the rear end electrical control compartment 206, and a plurality of intermediate beams 302 located between the front end crossbeam 301a and the rear end crossbeam 301b;

[0079] Each of the intermediate beams 302 divides the battery compartment 207 between the front end crossbeam 301a and the rear end crossbeam 301b into several battery sub-compartments. Each battery sub-compartment contains several individual battery cells, and the individual battery cells are electrically connected through a CCS assembly to form a battery module.

[0080] The centrally located electronic control compartment ensures that the seams between adjacent outer frame panels are all within the compartment. The compartment contains fewer electronic control components, many of which are manufactured with some degree of waterproofing. Therefore, minor liquid ingress into the compartment will not affect the normal operation of the battery pack. Even if the sealant 204 at the panel seams fails, liquid will preferentially enter the electronic control compartment rather than directly into the battery compartment 207, minimizing the risk of malfunction due to liquid ingress.

[0081] In this embodiment, the ends of the front end crossbeam 301a and the rear end crossbeam 301b are welded to the corresponding side outer frame uprights 203.

[0082] Optionally, the side frame upright plate 203 includes a side plate body 2031 and several reinforcing plates 2032; the reinforcing plates are provided between the two end crossbeams and the side frame upright plate 203; the reinforcing plates are welded to the side frame upright plate 203 and to the corresponding front end crossbeam 301a or rear end crossbeam 301b. In the event of a side or bottom collision, the area between the two end crossbeams and the side frame upright plate 203 is a force concentration area. The reinforcement plates 2032 can improve the structural strength and rigidity of the connection between the side plate body 2031 and the end crossbeams, enhance the ability to resist impact loads, reduce the risk of weld fracture due to vibration, or prevent excessive deformation that could damage the seal, thereby better protecting the internal structure of the battery box from intrusion damage.

[0083] Furthermore, the upper part of the end face of both end beams is provided with an upward-facing end notch 3011 that connects to the corresponding electrical control compartment. That is, the notch 3011 of the end beam 301a faces upward and connects to the front electrical control compartment 205, and the notch 3011 of the end beam 301b faces upward and connects to the rear electrical control compartment 206.

[0084] Among them, the vertical joint between the end notch 3011 and the side outer frame upright plate 203, as well as the joint between the lower part of the two end crossbeams and the side outer frame upright plate 203, are all non-welded edges and are coated with beam joint sealant 6.

[0085] The horizontal joint between the end notch 3011 and the side outer frame upright plate 203, as well as the joint between the middle of the two end crossbeams and the side outer frame upright plate 203, are all welded edges and are welded to the side outer frame upright plate 203 by solder 7.

[0086] The complex geometry at the intersection of weld seams leads to a significant increase in stress concentration. Under load, these stress concentration points easily become weak points between the front end beam 301a, the rear end beam 301b, and the side outer frame plate 203, triggering crack initiation and propagation, compromising the enclosure's sealing performance, and thus reducing load-bearing capacity and fatigue life. By applying beam joint sealant 6 to the vertical joints between the end notch 3011 and the side outer frame plate 203, as well as the lower parts of the two end beams and the side outer frame plate 203, the occurrence of intersection weld seams is reduced, improving the enclosure's reliability and sealing performance. Simultaneously, to ensure connection strength and rigidity, the horizontal joints between the end notch 3011 and the side outer frame plate 203, as well as the joints between the middle parts of the two end beams and the side outer frame plate 203, are all welded edges, providing strong mechanical connection force. The combination of welding and applying beam sealant 6 reduces the use of welding materials and welding steps, while also reducing material deformation and repair costs caused by welding. At the same time, the sealant application and curing process can be efficiently integrated with the production process, improving overall production efficiency and shortening the production cycle.

[0087] Optionally, the beam joint sealant 6 can cover part of the welded edge. Welds are sensitive areas for electrochemical corrosion. The metallographic structure of the heat-affected zone of the weld differs from that of the base material, resulting in a potential difference. In humid environments, salt spray, and other conditions, it is highly susceptible to electrochemical corrosion (such as weld rust). Covering the weld with beam joint sealant 6 completely isolates it from external corrosive media such as moisture, salt, de-icing agents, and acid rain, significantly extending the beam's lifespan.

[0088] At the microscopic level, weld seams may contain defects such as porosity, cracks, undercut, and lack of fusion. These defects are potential channels for liquid leakage. Covering part of the seams with beam joint sealant 6 can reduce the risk of liquid penetration caused by these defects to a certain extent, ensuring that the battery pack as a whole meets high protection levels such as IP67 / IP68, protecting the internal battery modules, BMS components, wiring harnesses, etc. from environmental damage.

[0089] Optional, see Figure 5The frame beam sealing adhesive layer 303 on the bottom surface of the front end crossbeam 301a and the rear end crossbeam 301b overflows toward the battery compartment 207 to form an inner overflow bottom edge 3031; the frame beam sealing adhesive layer 303 on the bottom surface of the front end crossbeam 301a and the rear end crossbeam 301b overflows toward the corresponding electronic control compartment to form an outer overflow bottom edge 3032.

[0090] The design of the inner overflow bottom edge 3031 and the outer overflow bottom edge 3032 can ensure that the gap between the bottom surface of the end beam and the base plate assembly 1 is completely filled by the frame beam sealing adhesive layer 303, avoiding the situation of insufficient adhesive leading to cavity.

[0091] Furthermore, the overflow distance of the inner bottom edge 3031 should not be too large to avoid affecting the installation of the battery module; the space corresponding to the electronic control compartment of the outer bottom edge 3032 is relatively ample, and the overflow distance can be appropriately increased to improve the adhesive quality. For example, the overflow distance of the inner bottom edge 3031 is a, 1mm≤a≤2mm; the overflow distance of the outer bottom edge 3032 is b, 0.5mm≤b≤5mm.

[0092] In this embodiment, see Figure 3 The base plate assembly 1 includes a liquid cooling plate 101 located below the frame beam sealant layer 303 and a bottom protective plate 102 fixed to the bottom of the liquid cooling plate 101.

[0093] The liquid cooling plate 101 is fastened to the outer frame assembly 2 and / or the inner beam assembly 3 by the cold plate fastener 4.

[0094] The bottom protective plate 102 is provided with a protective plate clearance hole 1021 for accommodating the head of the cold plate fastener 4 at the position corresponding to the position of the cold plate fastener 4; the protective plate clearance hole 1021 is provided with head sealant 5 that covers the head of the cold plate fastener 4 and fills the protective plate clearance hole 1021.

[0095] The combined design of the guard plate clearance hole 1021 and the head sealant 5 solves the leakage problem of traditional liquid cooling plate 101 fasteners. The sealant forms an elastic sealing layer between the cold plate and the bottom guard plate 102, which not only prevents corrosion of the fastener head, but also eliminates the channel for liquid to seep up along the thread gap, achieving long-term sealing under dynamic vibration environment.

[0096] See Figure 4 In this embodiment, the sealed battery box further includes:

[0097] Several box cover fixing brackets 8 are fixed to the top of the box inner beam assembly 3;

[0098] The box cover assembly 9 is disposed above the bottom plate assembly 1 and the box inner beam assembly 3, and the middle position of the box cover assembly 9 is locked to each of the box cover fixing brackets 8 by a number of box cover fasteners 12.

[0099] An annular sealing ring 10 is provided between the box cover assembly 9 and the box cover fixing bracket 8 for the box cover fastener 12 to pass through.

[0100] The annular sealing ring 10 forms a compression sealing ring around the circumference of the cover fastener 12, effectively offsetting the slight displacement of the cover caused by vehicle bumps. This design prevents moisture from entering the enclosure from the fixing point, and together with the bracket fixing structure, it ensures a uniform distribution of sealing pressure on the cover, effectively improving the overall environmental protection level.

[0101] Furthermore, both the lid assembly 9 and the base plate assembly 1 are provided with sealing gaskets 11 between themselves and the outer frame assembly 2. The double sealing gaskets 11 form a sealing interface on the upper and lower end faces of the outer frame assembly 2, providing the most basic sealing protection for the upper and lower parts of the outer frame assembly 2.

[0102] In summary, the sealed battery box and battery pack provided in this embodiment have the following advantages:

[0103] ① 204 Sealant for Vertical Panel Joints: This elastic sealing material fills the joints of the outer frame vertical panels, absorbing vibration stress and blocking the intrusion path of external foreign objects, thus improving the overall sealing reliability.

[0104] ② 303 partitioned design of the frame beam sealing layer: The sealing coating isolates the sub-chambers, limits the range of liquid diffusion, and reduces the risk of short circuits or thermal runaway caused by local liquid ingress.

[0105] ③ Priority layout of the electronic control compartment: The seams are concentrated in the electronic control compartment. The electronic control components are waterproof, so even if the seal fails, liquid can be prevented from directly entering the battery compartment 207.

[0106] ④ Beam joint sealant 6 covers weld seams: reduces cross weld seams, compensates for welding defects, blocks liquid penetration paths, and balances structural strength and sealing performance.

[0107] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A sealed battery case characterized by comprising: include: Base plate assembly (1); The outer frame assembly (2) is located at the edge above the bottom plate assembly (1) and includes a plurality of outer frame uprights connected in sequence to surround and form the internal space of the box. The box beam assembly (3) is located in the box space and divides the box space into several sub-chambers; wherein, the bottom surfaces of both the outer frame assembly (2) and the box beam assembly (3) are coated with a frame beam sealant layer (303) to block liquid flow.

2. The sealed battery case according to claim 1, wherein Each of the outer frame uprights includes a front outer frame upright (201) located at the front end of the base plate assembly (1), a rear outer frame upright (202) located at the rear end of the base plate assembly (1), and two side outer frame uprights (203) located between the front outer frame upright (201) and the rear outer frame upright (202). The joint of two adjacent outer frame panels is coated with panel joint sealant (204). Each of the sub-chambers includes a front electrical control compartment (205) near the front outer frame upright plate (201), a rear electrical control compartment (206) near the rear outer frame upright plate (202), and a battery compartment (207) located between the two electrical control compartments.

3. The sealed battery case according to claim 2, wherein The internal beam assembly (3) includes a front end crossbeam (301a) that is opposite to the front end outer frame plate (201) and cooperates with the front end outer frame plate (201) to surround and form the front end electrical control compartment (205), a rear end crossbeam (301b) that is opposite to the rear end outer frame plate (202) and cooperates with the rear end outer frame plate (202) to surround and form the rear end electrical control compartment (206), and a plurality of intermediate beams (302) located between the front end crossbeam (301a) and the rear end crossbeam (301b). Each of the intermediate beams (302) divides the battery compartment (207) between the front end crossbeam (301a) and the rear end crossbeam (301b) into several battery sub-compartments.

4. The sealed battery case according to claim 3, wherein The frame beam sealant layer (303) on the bottom surface of the front end crossbeam (301a) and the rear end crossbeam (301b) overflows toward the battery compartment (207) to form an inner overflow bottom edge (3031), and the overflow distance of the inner overflow bottom edge (3031) is a, 1mm≤a≤2mm; The frame beam sealant layer (303) on the bottom surface of the front end crossbeam (301a) and the rear end crossbeam (301b) overflows toward the corresponding electrical control compartment to form an overflow bottom edge (3032), and the overflow distance of the overflow bottom edge (3032) is b, 0.5mm≤b≤5mm.

5. The sealed battery case according to claim 3, wherein The two ends of the front end crossbeam (301a) and the rear end crossbeam (301b) are welded to the corresponding side outer frame uprights (203).

6. The sealed battery case according to claim 3, wherein The side outer frame upright plate (203) includes a side plate body (2031) and a number of reinforcing plates (2032); The reinforcing plate (2032) is provided between the two end crossbeams and the side outer frame upright plate (203); The reinforcing plate (2032) is welded to the side outer frame upright plate (203) and welded to the corresponding front end crossbeam (301a) or rear end crossbeam (301b).

7. The sealed battery case according to claim 5 or 6, characterized by Both of the end beams have an upward-facing end notch (3011) on the upper part of their end faces that connects to the corresponding electrical control compartment. Among them, the vertical joint between the end notch (3011) and the side outer frame upright plate (203), as well as the joint between the lower part of the two end crossbeams and the side outer frame upright plate (203), are all non-welded edges and are coated with beam joint sealant (6). The horizontal joint between the end notch (3011) and the side outer frame plate (203), as well as the joint between the middle of the two end beams and the side outer frame plate (203), are all welded edges and are welded to the side outer frame plate (203) by solder (7).

8. The sealed battery case of claim 1, wherein The base plate assembly (1) includes a liquid cooling plate (101) located below the frame beam sealant layer (303) and a bottom protective plate (102) fixed to the bottom of the liquid cooling plate (101). The liquid cooling plate (101) is fastened to the outer frame assembly (2) and / or the inner beam assembly (3) by the cold plate fastener (4); The bottom guard plate (102) is provided with a guard plate clearance hole (1021) corresponding to the position of the cold plate fastener (4) for accommodating the head of the cold plate fastener (4); the guard plate clearance hole (1021) is provided with head sealant (5) that covers the head of the cold plate fastener (4) and fills the guard plate clearance hole (1021).

9. The sealed battery case of claim 1, wherein, Also includes: Several box cover fixing brackets (8) are fixed to the top of the box inner beam assembly (3); The box cover assembly (9) is placed on top of the bottom plate assembly (1) and the box inner beam assembly (3), and the middle part of the box cover assembly (9) is locked to each of the box cover fixing brackets (8) by a number of box cover fasteners (12). An annular sealing ring (10) is provided between the box cover assembly (9) and the box cover fixing bracket (8) for the box cover fastener (12) to pass through. Both the lid assembly (9) and the base plate assembly (1) are provided with sealing gaskets (11) between themselves and the outer frame assembly (2).

10. A battery pack, characterized by, It includes a sealed battery box as described in any one of claims 1-9, a battery module located in the middle of the sealed battery box, and an electronic control component located at the end of the sealed battery box.

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