Battery pack and electric device

Abstract

The utility model provides a kind of battery pack and electric equipment, wherein battery pack includes battery box and battery pack, battery box includes frame and bottom plate component, frame and bottom plate component are enclosed and are used to accommodate the containing space of battery pack, containing space is separated into battery compartment and electrical compartment by structural beam, battery compartment is separated into at least two sub battery compartments by partition beam;Bottom plate component includes first bottom plate and second bottom plate of up-down superposition, first bottom plate is used to support battery pack, multiple recess cavities are provided on second bottom plate, second bottom plate is sealed and fixed on the side of first bottom plate away from being used to support battery pack, to be enclosed with first bottom plate and form multiple exhaust chambers, and one exhaust chamber is communicated with one sub battery compartment or electrical compartment.The sub battery compartment, electrical compartment and exhaust chamber in the battery pack are all independently sealed, which can effectively prevent high-temperature gas from reversing into other sub battery compartments or electrical compartments that have not experienced thermal runaway through the exhaust chamber, thereby effectively improving the reliability of the battery pack.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, and specifically relates to a battery pack and electrical equipment. Background Technology

[0002] In fields such as new energy storage and electric vehicles, battery packs serve as the core energy storage and supply unit, and their structural design directly affects the safety and reliability of the system. Currently, mainstream battery packs typically adopt a modular layout, integrating an electrical compartment and multiple sub-battery compartments. The electrical compartment houses electrical control components such as the battery management system, high-voltage connectors, and relays, while the sub-battery compartments are arranged in an array to accommodate multiple individual cells or battery modules to meet the energy demands of different scenarios.

[0003] To facilitate wiring, heat dissipation, and subsequent maintenance, existing battery packs generally adopt a compartmentalized design, where the electrical compartment and each sub-battery compartment are connected, as are the sub-battery compartments themselves, through pre-reserved cable channels, ventilation holes, or structural gaps. While this design simplifies assembly and reduces manufacturing costs, it exposes significant safety hazards when the battery pack faces extreme conditions such as overcharging, short circuits, or mechanical impacts. For instance, if a battery pack in one sub-battery compartment experiences thermal runaway and generates high-temperature gas, the interconnected compartments will allow the gas to rapidly spread into other sub-battery compartments and the electrical compartment, potentially causing the entire battery pack to fail. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a battery pack that can achieve independent sealing, effectively preventing high-temperature gas from flowing back into other sub-battery compartments or electrical compartments that have not experienced thermal runaway through the exhaust chamber, thereby effectively improving the reliability of the battery pack.

[0005] Another objective of this utility model is to provide an electrical device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery pack includes a battery housing and a battery pack. The battery housing includes a frame and a base plate assembly. The frame and the base plate assembly form a receiving space for accommodating the battery pack. The receiving space is divided into a battery compartment and an electrical compartment by a structural beam. The battery compartment is divided into at least two sub-battery compartments by a partition beam.

[0008] The base plate assembly includes a first base plate and a second base plate stacked on top of each other. The first base plate is used to support the battery pack. The second base plate is provided with a plurality of recesses. The second base plate is sealed and fixed to the side of the first base plate away from the side used to support the battery pack, so as to form a plurality of exhaust chambers together with the first base plate. Each exhaust chamber is connected to a sub-battery chamber or electrical chamber.

[0009] As can be seen from the above technical solutions, when one of the sub-battery compartments or electrical compartments experiences thermal runaway, the high-temperature gas generated will enter the exhaust chamber from the sub-battery compartment or electrical compartment and be discharged outside the battery pack through the exhaust channel connected to the exhaust chamber. Compared with the prior art, the sub-battery compartment, electrical compartment, and exhaust chamber in the battery pack disclosed in this utility model embodiment are all independently sealed. When one of the sub-battery compartments or electrical compartments experiences thermal runaway and enters the exhaust chamber, it can effectively prevent high-temperature gas from flowing back into other sub-battery compartments or electrical compartments that have not experienced thermal runaway through the exhaust chamber, thereby effectively improving the reliability of the battery pack. Attached Figure Description

[0010] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the battery pack structure disclosed in the embodiments of this utility model;

[0012] Figure 2 This is a schematic diagram of the overall structure of the exhaust sealing device disclosed in the embodiment of this utility model;

[0013] Figure 3 for Figure 2 Top view;

[0014] Figure 4 for Figure 2 A bottom view;

[0015] Figure 5 This is a schematic diagram of the structure of the second base plate disclosed in the embodiment of this utility model;

[0016] Figure 6 for Figure 5 Top view;

[0017] Figure 7 for Figure 5 A bottom view.

[0018] Figure 8This is a schematic diagram showing the positional arrangement of the first and second base plates.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100-battery pack,

[0021] 200 - First base plate, 201 - Vent hole

[0022] 300 - Second base plate, 301 - Main body of second base plate, 302 - Separating rib, 303 - Recessed cavity

[0023] 400 - First sealing strip. Detailed Implementation

[0024] In view of this, the core of this utility model is to provide a battery pack that can achieve independent sealing, effectively preventing high-temperature gas from flowing back into other sub-battery compartments or electrical compartments that have not experienced thermal runaway through the exhaust chamber, thereby effectively improving the reliability of the battery pack.

[0025] Another core aspect of this utility model is that it provides an electrical device.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] First, the relevant terms in this application document are defined:

[0028] 1. Battery cell:

[0029] Definition / Function: A battery cell can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery cell, the active materials can be activated by charging after discharge so that it can continue to be used.

[0030] Materials / Composition: A battery cell includes a casing and a cell housed within the casing.

[0031] 2. Battery pack

[0032] Definition or function: A battery pack is formed by connecting multiple battery cells with similar capacity and internal resistance in series or parallel.

[0033] 3. Battery pack

[0034] Definition / Function: (1) A battery pack consists of a battery group, a battery management system (BMS), a thermal management system, an electrical connection system (high voltage / low voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.) and protective components, etc., and the above components are placed in the box and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0035] (2) The battery pack, as a rechargeable battery, is the power source for new energy vehicles.

[0036] Materials / Composition:

[0037] (1) A battery pack generally includes a cell module, a battery management system (BMS) control module, and a housing that contains the cell module and the BMS control module.

[0038] (2) The battery pack includes a housing and multiple individual batteries housed in the housing. The housing is divided into upper and lower parts, which are sealed together.

[0039] (3) The battery pack includes at least two battery cells, a BMS control assembly and a casing.

[0040] (4) A battery pack generally includes a battery box and a battery module. The battery box includes a lower box and an upper cover.

[0041] (5) A battery pack generally includes a housing, battery cells and a separator. Both the battery cells and the separator are located in the housing. The separator is located on the side of the battery cell away from the bottom wall of the housing, separating the battery cell from other devices located above the battery cell, thus playing a role in isolation.

[0042] 4. Battery casing

[0043] Definition / Function:

[0044] (1) refers to a closed or semi-closed structure made of materials such as metal and plastic, which is the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability and functionality requirements of the battery pack in different usage scenarios.

[0045] (2) The battery box provides installation space for battery packs, BMS, cooling system, electrical connection components, etc., and fixes these components in the box through reasonable structural design to ensure that they maintain a relatively stable position during the operation of the battery pack, and avoid damage to components or loosening of connections due to vibration, impact and other factors.

[0046] Materials / Composition:

[0047] (1) The battery box includes: a lower box, including a bottom plate and a side plate connected to and surrounding the bottom plate; an upper box, connected to the side plate, wherein the upper box has a cover plate opposite to the bottom plate, and the upper box and the lower box together enclose a receiving chamber.

[0048] (2) The battery pack box is generally composed of an upper box and a lower box. The lower box generally has four side plates and a bottom plate. The four side plates can be integrally formed with the bottom plate or can be processed and formed by separate fixed connection.

[0049] (3) The battery box may include a bottom and a cover plate, the bottom and the cover plate covering each other, and the bottom and the cover plate together defining a receiving space for accommodating the battery module.

[0050] (4) The battery box can be cast from materials such as steel plate and aluminum alloy, or lightweight materials such as glass fiber reinforced composite material and carbon fiber reinforced composite material.

[0051] (5) The shape of the battery box can be a cylinder, cuboid, cube, etc.

[0052] 5. Base plate

[0053] Definition / Function: The base plate is the main load-bearing component of the battery pack. It usually refers to the structural component installed at the bottom of the battery pack, which is used to support and fix the battery pack, battery management system, cooling system and other components inside the battery pack.

[0054] Materials / Composition:

[0055] (1) The base plate is set at the bottom of the box frame, for example, the base plate is fixed to the bottom of the box frame by welding, riveting, screwing or other means.

[0056] (2) The base plate can be made of various materials, such as aluminum alloy, steel, stainless steel and other high-strength materials;

[0057] (3) The base plate can be rectangular, circular, polygonal, or plate-shaped. The specific shape is not limited. Its size is determined by the number of cells contained in the battery pack and the size of the cells.

[0058] 6. Border

[0059] Definition / Function:

[0060] The frame is the structural framework of the battery pack housing, serving to provide support, protection, and connection.

[0061] Materials / Composition:

[0062] (1) The frame can be formed by splicing multiple beams together.

[0063] (2) The frame includes four sub-frames, which are connected end to end to form an enclosed space. The enclosed space is closed by the top cover and the bottom plate to form a receiving cavity.

[0064] (3) The frame can be made of various materials, such as aluminum alloy, copper alloy, steel, plastic, etc.

[0065] (4) The border can be rectangular, circular, polygonal, etc., and there are no specific limitations. The interior of the border can be a solid structure or contain a cavity.

[0066] Please refer to Figures 1-8 The battery pack 100 disclosed in this embodiment of the present invention includes a battery box and a battery pack. The battery box includes a frame and a bottom plate assembly, which enclose a receiving space for accommodating the battery pack. The receiving space is divided into a battery compartment and an electrical compartment by a structural beam. The battery compartment is divided into at least two sub-battery compartments by a partition beam.

[0067] The base plate assembly includes a first base plate 200 and a second base plate 300 stacked on top of each other. The first base plate 200 is used to support the battery pack. The second base plate 300 is provided with a plurality of recesses 303. The second base plate 300 is sealed and fixed to the side of the first base plate 200 away from the side used to support the battery pack, so as to form a plurality of exhaust chambers together with the first base plate 200. Each exhaust chamber is connected to a sub-battery chamber or electrical chamber.

[0068] When one of the sub-battery compartments or electrical compartments experiences thermal runaway, the high-temperature gas generated will leak from the sub-battery compartment or electrical compartment into the exhaust chamber, and then be discharged from the battery pack 100 through the exhaust channel connected to the exhaust chamber. Compared with the prior art, the sub-battery compartment, electrical compartment, and exhaust chamber in the battery pack 100 disclosed in this embodiment are all independently sealed. When one of the sub-battery compartments or electrical compartments experiences thermal runaway and enters the exhaust chamber, it can effectively prevent high-temperature gas from leaking back into other sub-battery compartments or electrical compartments that have not experienced thermal runaway, thereby effectively improving the reliability of the battery pack 100.

[0069] It should be noted that the battery pack 100 disclosed in this embodiment of the present invention has multiple vent holes 201 on the first base plate 200. The battery pack includes multiple battery cells, and each battery cell is equipped with an explosion-proof valve. Each vent hole 201 corresponds to an explosion-proof valve of a battery cell. When a battery cell experiences thermal runaway, the high-temperature and high-pressure gas it generates can be quickly discharged into the exhaust chamber through the corresponding vent hole 201.

[0070] As a further embodiment, the area of ​​the sub-battery compartment disclosed in this utility model embodiment is S1, and the area of ​​the cavity 303 communicating with the sub-battery compartment is S2, wherein the ratio of S2 / S1 is 0.7 to 1.2. For example, the ratio of S2 / S1 can specifically be 0.7, 0.8, 0.9, 1, or 1.1. If the ratio of S2 / S1 is too large, the sealing space may be correspondingly reduced, resulting in poor sealing effect; if the ratio of S2 / S1 is too small, the exhaust efficiency may be low during thermal runaway, leading to increased safety risks.

[0071] Where the number of concave cavities 303 connected to a chamber is one, B represents the area of ​​one concave cavity 303; when the number of concave cavities 303 connected to a chamber is multiple, B is the sum of the areas of multiple concave cavities 303.

[0072] It should be noted that the second base plate 300 disclosed in this embodiment of the present invention includes a second base plate body 301 and a partition rib 302. A cavity 303 is disposed on the second base plate body 301, and a partition rib 302 is disposed between every two adjacent cavities 303.

[0073] In this embodiment of the present invention, there may be one partition rib 302, and in this case, there are two recesses 303 and two sub-battery compartments, that is, one sub-battery compartment corresponds to one recess 303.

[0074] Of course, the partition ribs 302 disclosed in this embodiment of the present invention can also be two, three or more. In this case, there can be three, four or more recesses 303, as long as one recess 303 corresponds to one sub-battery compartment.

[0075] As a further embodiment, a first sealing strip 400 is provided between the edge of the second base plate body 301 and the edge of the first base plate 200, and a second sealing strip is provided between the first base plate 200 and the partition rib 302. This arrangement can further improve the sealing between different sub-battery compartments, as well as between the sub-battery compartments and the electrical compartment.

[0076] It should be noted that the surface of the partition rib 302 opposite to the first base plate 200 is the sealing surface, wherein the width of the sealing surface is greater than the width of the second sealing strip.

[0077] The first sealing strip 400 and the second sealing strip can be made of high-resilience silicone, ethylene propylene diene monomer (EPDM) rubber or silicone rubber. The flame retardant rating must meet the requirements of UL94-V0, UL94-V1 or U194-HB, and the Shore A hardness is 20–60.

[0078] In one embodiment, the width of the first sealing strip 400 and the second sealing strip disclosed in this utility model embodiment is Lmm, and the depth of the cavity 303 is Hmm, wherein 3mm≤Hmm≤15mm, and 15≤L×H≤300.

[0079] For example, Hmm can be specifically 3mm, 6mm, 8mm, 10mm, or 15mm. This setting can maximize the utilization of the internal space of the battery pack 100 while meeting the highest safety standards (anti-thermal propagation).

[0080] For example, the specific value of L×H can be 15, 50, 100, 150, or 300. If the L×H ratio is too large, it may result in low space utilization of the battery pack 100, thus affecting the energy density of the battery pack 100. If the L×H ratio is too small, it may result in poor sealing between different sub-battery compartments and between the sub-battery compartments and the electrical compartment. The high-temperature gas entering the cavity 303 will have a large impact force, and it is very easy for it to break through the sealing area and enter other adjacent cavities 303, thus causing sealing failure.

[0081] As a further embodiment, the present invention discloses 5mm≤Hmm≤10mm and 30≤L×H≤150.

[0082] For example, Hmm can be specifically 5mm, 6mm, 7mm, 8mm, or 10mm. If the depth of the cavity 303 is too small, it may lead to insufficient exhaust chamber volume. After the gas enters the exhaust chamber, the limited internal space will cause a sharp increase in local pressure, which may break through the sealing connection between the first bottom plate 200 and the second bottom plate 300, causing gas leakage. If the depth of the cavity 303 is too large, it may encroach on the space of other components in the battery pack 100, resulting in an increase in the volume of the entire battery pack 100. However, the setting of the depth of the cavity 303 disclosed in this utility model embodiment can achieve the beneficial effect of isolating thermal runaway gas while ensuring that the volume of the battery pack 100 remains unchanged.

[0083] For example, the specific value of L×H can be 30, 40, 50, 100, or 150. By increasing the lower limit of L×H, the sealing reliability between different sub-battery compartments and between the sub-battery compartments and the electrical compartment can be ensured in the event of thermal runaway, effectively suppressing heat propagation. By reducing the upper limit of L×H, structural space can be saved to the maximum extent, and the energy density of the battery pack 100 can be increased.

[0084] This embodiment of the utility model does not specifically limit the width of the second sealing strip. As long as the width and depth meet the usage requirements of this utility model, they are within the protection scope of this utility model.

[0085] As one embodiment, the width of the first sealing strip 400 and the second sealing strip disclosed in this utility model embodiment is 5mm ≤ Lmm ≤ 20mm. For example, Lmm can specifically be 5mm, 8mm, 10mm, 15mm, or 20mm. If the width of the first sealing strip 400 and the second sealing strip is too wide, it may cause interference problems during assembly; if the width of the first sealing strip 400 and the second sealing strip is too narrow, it may have weak resistance to mechanical damage and be prone to sealing failure. However, the width setting of the first sealing strip 400 and the second sealing strip disclosed in this utility model embodiment not only avoids interference problems during assembly, but also effectively improves the sealing performance.

[0086] As a further embodiment, the disclosed dimensions in this utility model are 5mm ≤ Lmm ≤ 10mm. For example, Lmm can specifically be 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm. By using a narrower first sealing strip 400 and a narrower second sealing strip, a more uniform sealing pressure distribution can be obtained, improving sealing reliability.

[0087] This embodiment of the invention does not specifically limit the depth of the cavity 303. As long as the width and depth meet the requirements of this invention, they are within the protection scope of this invention.

[0088] This embodiment of the utility model does not specifically limit the thickness of the first sealing strip 400 and the second sealing strip. Any specific thickness value that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0089] As a specific embodiment, the initial thickness of both the first sealing strip 400 and the second sealing strip disclosed in this utility model embodiment is B mm, wherein 3 mm ≤ B mm ≤ 8 mm. For example, B mm can specifically be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm. The setting range of B mm can effectively control the compression ratio of the first sealing strip 400 and the second sealing strip, thereby ensuring that the first sealing strip 400 and the second sealing strip can generate a durable, stable, and sufficient sealing force, while also avoiding premature failure of the first sealing strip 400 and the second sealing strip.

[0090] This embodiment of the utility model does not limit the specific connection method between the second base plate 300 and the first base plate 200. Any connection method that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0091] In one embodiment, the second base plate body 301 disclosed in this utility model embodiment is welded to the edge of the first base plate 200. This arrangement can effectively improve the connection strength between the first base plate 200 and the second base plate 300, thereby further improving the performance against pressure impact.

[0092] In another embodiment, the second base plate body 301 disclosed in this utility model embodiment is connected to the first base plate 200 by a first connector, wherein the first connector is adhesive and / or bolt. This arrangement avoids the risk of thermal deformation caused by welding, ensures precise alignment of the vent hole 201 and the cavity 303, and improves the flexibility and adaptability of the connection process.

[0093] As a specific embodiment, the first connector can be a separately provided adhesive, a separately provided bolt, or both adhesive and bolt, that is, it can be bonded by adhesive and then tightened by bolt to achieve double fixation.

[0094] This embodiment of the utility model does not limit the specific connection method between the second base plate body 301 and the partition rib 302. Any connection method that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0095] In the first embodiment of this utility model, the second base plate body 301 disclosed in this embodiment is welded to the partition rib 302. This arrangement, where the partition rib 302 and the second base plate body 301 are welded together to form a rigid support structure, significantly improves the overall rigidity of the second base plate 300. Under the gas pressure generated by thermal runaway gas, the partition rib 302, connected by welding, is less prone to deformation, maintaining the shape and volume stability of the cavity 303, thereby preventing the obstruction of one or more exhaust paths due to structural deformation.

[0096] As a second embodiment of the present invention, the second base plate body 301 and the partition rib 302 disclosed in this embodiment are connected by a second connector, wherein the second connector is an adhesive and / or a bolt. This connection method can avoid the risk of thermal deformation caused by welding.

[0097] As a specific embodiment, the second connector can be a separately provided adhesive, a separately provided bolt, or both adhesive and bolt, that is, it can be bonded by adhesive and then tightened by bolt to achieve double fixation.

[0098] As a third embodiment of this utility model, the second base plate body 301 and the partition rib 302 are integrally formed. Compared with welding, bonding or screwing, this connection method fundamentally eliminates the sealing hazards that may exist in welding or bonding, and not only has high sealing performance, but also high strength.

[0099] When the second base plate body 301 is bonded to the edge of the first base plate 200, in order to improve the sealing effect between the second base plate body 301 and the first base plate 200, the exhaust sealing device disclosed in this utility model embodiment further includes a first sealing strip 400, wherein the first sealing strip 400 is disposed between the edges of the second base plate body 301 and the first base plate 200.

[0100] It should be noted that the battery cell disclosed in this embodiment of the invention has an adhesive area, wherein the first base plate 200 is bonded to the adhesive area. This arrangement enables precise positioning of the battery cell and the first base plate 200.

[0101] The bonding area is a ring-shaped region arranged circumferentially along the explosion-proof valve, and the bonding area avoids the explosion-proof valve. This arrangement spatially eliminates the risk of adhesive contamination of the explosion-proof valve, thereby achieving central venting and peripheral fixation, and ensuring that high-temperature gas can be smoothly discharged through the explosion-proof valve.

[0102] This embodiment of the invention does not specifically limit the distance setting value between the edge of the bonding area and the explosion-proof valve. As long as the numerical setting value meets the usage requirements of this invention, it is within the protection scope of this invention.

[0103] In one embodiment, the distance between the edge of the bonding area and the explosion-proof valve disclosed in this utility model embodiment is Dmm, where Dmm ≥ 0.5mm. If the distance between the edge of the bonding area and the explosion-proof valve is too large, the bonding area between the battery cell and the first base plate 200 may be insufficient, resulting in sealing failure; if the distance between the edge of the bonding area and the explosion-proof valve is too small, the explosion-proof valve may not be able to open normally. The setting of the distance between the edge of the bonding area and the explosion-proof valve disclosed in this utility model embodiment can both ensure the normal opening of the explosion-proof valve and avoid sealing failure.

[0104] This utility model embodiment does not limit the specific structure of the first base plate 200. Any structure that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0105] The first base plate 200 disclosed in this embodiment of the present invention can be a flat plate, a metal plate with a certain curvature, or a cold plate.

[0106] As a specific embodiment of this utility model, the first base plate 200 disclosed in this embodiment is a cold plate, wherein the first base plate 200 is provided with a flow channel, and the exhaust hole 201 is arranged to avoid the flow channel. With this arrangement, the first base plate 200 can not only form an independent exhaust chamber with the second base plate 300, but also play a liquid cooling role for the battery cells.

[0107] This utility model embodiment also discloses an electrical device, including the battery pack 100 disclosed in any of the above embodiments.

[0108] Since the electrical device uses the battery pack 100 disclosed in this embodiment of the present invention, the electrical device also has the technical advantages of the battery pack 100 disclosed in this embodiment of the present invention, and this embodiment of the present invention will not elaborate on these advantages further.

[0109] Finally, it should be noted that in this document, relational 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 such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0110] 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.

[0111] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, The battery housing includes a battery box and a battery pack. The battery box includes a frame and a base plate assembly. The frame and the base plate assembly form a receiving space for accommodating the battery pack. The receiving space is divided into a battery compartment and an electrical compartment by a structural beam. The battery compartment is divided into at least two sub-battery compartments by a partition beam. The base plate assembly includes a first base plate and a second base plate stacked on top of each other. The first base plate is used to support the battery pack. The second base plate is provided with a plurality of recesses. The second base plate is sealed and fixed to the side of the first base plate away from the side used to support the battery pack, so as to form a plurality of exhaust chambers together with the first base plate. Each exhaust chamber is connected to a sub-battery chamber or electrical chamber.

2. The battery pack according to claim 1, characterized in that, The first base plate has multiple vent holes; The battery pack includes multiple battery cells, each of which is equipped with an explosion-proof valve, and each vent hole is corresponding to an explosion-proof valve of the battery cell.

3. The battery pack according to claim 1, characterized in that, The area of ​​the sub-battery compartment is S1, and the area of ​​the cavity communicating with the sub-battery compartment is S2. The ratio of S2 / S1 is 0.7 to 1.

2.

4. The battery pack according to claim 1, characterized in that, The second base plate includes a second base plate body and a partition rib. The cavity is disposed on the second base plate body, and a partition rib is disposed between every two adjacent cavities.

5. The battery pack according to claim 4, characterized in that, A first sealing strip is provided between the edge of the second base plate and the edge of the first base plate, and a second sealing strip is provided between the first base plate and the partition rib.

6. The battery pack according to claim 5, characterized in that, The width of the first sealing strip and the second sealing strip is Lmm, and the depth of the cavity is Hmm, where 3mm≤Hmm≤15mm and 15≤L×H≤300.

7. The battery pack according to claim 6, characterized in that, 5mm≤Hmm≤10mm, 30≤L×H≤150.

8. The battery pack according to claim 6, characterized in that, 5mm≤Lmm≤20mm.

9. The battery pack according to claim 8, characterized in that, 5mm≤Lmm≤10mm.

10. The battery pack according to claim 5, characterized in that, The initial thickness of both the first and second sealing strips is B mm, where 3 mm ≤ B mm ≤ 8 mm.

11. The battery pack according to claim 4, characterized in that, The second base plate body is welded to the edge of the first base plate, or The second base plate body is connected to the first base plate by a first connector, which is adhesive and / or bolts.

12. The battery pack according to claim 4, characterized in that, The second base plate body is welded to the partition rib, or The second base plate body is connected to the partition rib by a second connector, which is adhesive and / or bolts, or The second base plate body is integrally formed with the partition rib.

13. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-12.

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