Bottom plate of battery pack, battery pack and electric equipment

Abstract

The utility model relates to a bottom plate of a battery pack, the battery pack and electric equipment, the bottom plate comprises a plate body and a reinforcing plate, and the plate body is provided with an exhaust port used for being communicated with an exhaust channel of the battery pack; and the reinforcing plate is separably connected with the outer wall surface, facing the outer side of the battery pack, of the plate body and covers the exhaust port. Through the technical scheme, the bottom plate of the battery pack provided by the utility model can reduce the possibility that the exhaust port of the exhaust channel of the battery pack is mistakenly opened due to the influence of external environmental factors, improves the reliability and safety of the whole battery pack, has the advantages of simple overall structure and convenience in installation and preparation, and is suitable for popularization and application. And the lightweight design of the battery pack is facilitated.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power utilization equipment, in particular to a bottom plate of a battery pack, a battery pack and a power utilization equipment. BACKGROUND

[0002] In the related art, the exhaust port of the exhaust passage of the battery pack is prone to be mistakenly opened due to external environmental factors, resulting in low reliability and safety of the entire battery pack. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present disclosure is to provide a bottom plate of a battery pack, a battery pack and a power utilization equipment, so as to reduce the possibility of mistakenly opening the exhaust port of the exhaust passage of the battery pack due to external environmental factors, and improve the reliability and safety of the entire battery pack.

[0004] To achieve the above purpose, the first aspect of the present disclosure provides a bottom plate of a battery pack, comprising: a plate body, wherein an exhaust port for communicating with an exhaust passage of the battery pack is arranged on the plate body; and a reinforcing plate, which is detachably connected to an outer wall surface of the plate body facing the outside of the battery pack and covers the exhaust port.

[0005] Optionally, the exhaust port is filled with a sealing element, which is blocked in the exhaust port.

[0006] Optionally, the number of reinforcing plates is one or more, and each reinforcing plate covers at least one exhaust port.

[0007] Optionally, each reinforcing plate covers a plurality of exhaust ports, and the plurality of exhaust ports are arranged in an array.

[0008] Optionally, the inner diameter of the exhaust port is 5-15 mm.

[0009] Optionally, in a first direction perpendicular to the center line of the exhaust port, the minimum distance between the outer edge of the reinforcing plate and the outer edge of the nearest exhaust port is 3-5 mm.

[0010] Optionally, the reinforcing plate is bonded to the plate body by a bonding layer.

[0011] Optionally, the bonding layer is formed by one of polyurethane sealant, EVA hot melt adhesive, acrylic adhesive, anaerobic adhesive, silicone rubber adhesive or polyvinyl acetate emulsion adhesive.

[0012] The second aspect of the present disclosure provides a battery pack, comprising a shell, wherein the shell comprises the bottom plate of the battery pack provided in the first aspect.

[0013] Optionally, the shell comprises a bottom plate assembly, the bottom plate assembly comprises oppositely arranged first and second plates, the exhaust passage is formed between the first and second plates, the first plate is provided with a pressure relief opening for communicating the pressure relief member of the battery monomer and the exhaust passage, and the second plate is the bottom plate.

[0014] Optionally, along the center line of the exhaust port, the exhaust port is oppositely arranged with the pressure relief member and the pressure relief opening.

[0015] The third aspect of the present disclosure provides a battery pack for an electrical device.

[0016] Through the above technical solution, that is, the bottom plate of the battery pack provided by the present disclosure, a reinforcing plate is arranged at the exhaust port of the plate body communicating with the exhaust passage of the battery pack, and the reinforcing plate is detachably connected with the plate body and covers the exhaust port. In this way, through the detachable connection of the reinforcing plate and the plate body, when the battery monomer in the battery pack, for example, is in thermal runaway (that is, the pressure relief member of the battery monomer is opened for pressure relief), the gas pressure in the exhaust passage rises due to thermal runaway, so that the reinforcing plate is pushed open by the suddenly increased gas pressure, that is, the reinforcing plate can be understood as being separated from the plate body, so that the exhaust port is opened to achieve the purpose of pressure relief through the exhaust port. The possibility of risks such as fire of the battery pack is reduced, which helps to improve the safety of the battery pack as a whole. At the same time, the overall structure is simple and easy to install and manufacture, which is beneficial to the lightweight design of the battery pack. In addition, since the reinforcing plate is connected to the outer wall surface of the plate body facing the outside of the battery pack, the possibility of the reinforcing plate falling off due to external environmental factors can be effectively reduced, and at the same time, the purpose of pressure relief by gas pressure can be achieved when thermal runaway occurs, which helps to improve the reliability and safety of the battery pack as a whole.

[0017] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and together with the following specific embodiments, serve to explain the present disclosure but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 is a structural schematic diagram of a battery pack provided in an exemplary embodiment of the present disclosure;

[0020] Figure 2 is a structural schematic diagram of a bottom plate provided in an exemplary embodiment of the present disclosure;

[0021] Figure 3 is a bottom view of the bottom plate provided in an exemplary embodiment of the present disclosure;

[0022] Figure 4 is a partial cross-sectional view of a bottom plate provided in an exemplary embodiment of the present disclosure;

[0023] Figure 5 is Figure 3 is a local enlarged schematic view at position A in FIG. 1, in which a plurality of exhaust ports are arranged in an array.

[0024] Explanation of Reference Numerals

[0025] 1 - plate body; 110 - exhaust port; 2 - exhaust passage; 3 - reinforcing plate; 4 - seal; 5 - case; 510 - bottom plate assembly; 511 - first plate; 512 - second plate; 513 - pressure relief port; 520 - frame; 6 - battery cell; 610 - pressure relief member; 7 - adhesive layer; 8 - virtual circle. DETAILED DESCRIPTION

[0026] A detailed description of specific embodiments of the present disclosure will be made below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0027] In the present disclosure, "inner, outer" means inner, outer with respect to the outline of the component or structure itself, unless otherwise stated. In addition, it should be noted that the terms such as "first, second" are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings represent the same elements.

[0028] According to a first aspect of the present disclosure, a bottom plate of a battery pack is provided, referring to Figures 1 to 5 as shown, the bottom plate includes a plate body 1 and a reinforcing plate 3, the plate body 1 is provided with an exhaust port 110 for communicating with an exhaust passage 2 of the battery pack; the reinforcing plate 3 is detachably connected with the outer wall surface of the plate body 1 facing the outside of the battery pack and covers the exhaust port 110.

[0029] According to the technical scheme, the bottom plate of the battery pack provided by the present disclosure is provided with a reinforcing plate 3 at the exhaust port 110 of the exhaust passage 2 of the battery pack, and the reinforcing plate 3 is detachably connected to the plate body 1 and covers the exhaust port 110. In this way, when the battery monomer 6 in the battery pack is in thermal runaway (i.e., when the pressure relief device 610 of the battery monomer 6 is opened), the gas pressure in the exhaust passage 2 rises due to thermal runaway, so that the reinforcing plate 3 is pushed open by the suddenly increased gas pressure, that is, the reinforcing plate 3 can be understood to be separated from the plate body 1, so that the exhaust port 110 is opened to achieve the purpose of pressure relief through the exhaust port 110, thereby reducing the risk of fire and other risks of the battery pack, improving the safety of the battery pack, and having the advantages of simple overall structure and easy installation and preparation, which is beneficial to the lightweight design of the battery pack.

[0030] It should be noted that the arrangement of the reinforcing plate 3 can replace the pressure relief device such as the explosion-proof valve or safety valve arranged on the shell 5 of the battery pack in the related art to achieve pressure relief of the battery pack after thermal runaway, thereby saving the arrangement space of the explosion-proof valve or safety valve, providing more design space for the overall design of the battery pack, and also being beneficial to the lightweight design of the battery pack due to the simple overall structure and easy installation and preparation of the reinforcing plate 3. Of course, in some embodiments not shown, the battery pack can also be provided with the reinforcing plate 3 and the pressure relief device such as the explosion-proof valve or safety valve to achieve pressure relief when thermal runaway occurs, and the present disclosure does not make specific limitations thereon, and those skilled in the art can adaptively design according to the actual application requirements.

[0031] In addition, since the reinforcing plate 3 is connected to the outer wall surface of the plate body 1 facing the outside of the battery pack, the possibility of the reinforcing plate 3 falling off due to external environmental factors can be effectively reduced, and at the same time, the purpose of pressure relief by the gas pressure knocking off the reinforcing plate 3 is not affected when thermal runaway occurs, thereby improving the reliability and safety of the battery pack, that is, since the reinforcing plate 3 is detachably connected to the outer wall surface of the plate body 1 facing the outside of the battery pack, when the external force F1 acting on the reinforcing plate 3 (see Figure 4 is generated due to external environmental factors such as mechanical impact outside the battery pack or bottom ball impact test of the battery pack, the external force F1 can be understood as the extrusion force of the reinforcing plate 3 pressed on the plate body 1, so that the risk of the reinforcing plate 3 falling off due to the external force F1 can be effectively reduced, thereby ensuring that the reinforcing plate 3 can be stably connected to the plate body 1 and cover the exhaust port 110 under normal conditions, and improving the reliability, safety and sealing performance of the battery pack.

[0032] Furthermore, in the event of thermal runaway of a single battery cell 6 within the battery pack (i.e., when the pressure relief device 610 of the single battery cell 6 is activated to release pressure), the high-temperature, high-pressure gas discharged through the pressure relief device 610 is ejected into the exhaust channel 2, causing the gas pressure in the exhaust channel 2 to rise, thereby generating an external force F2 (see reference) within the exhaust channel 2. Figure 4 As shown), the reinforcing plate 3 can be pushed open by the sudden increase in air pressure in the exhaust channel 2 (i.e., external force F2 acts on the reinforcing plate 3). At this time, the external force F2 can be understood as the impact force that can detach the reinforcing plate 3 from the plate body 1. When the external force F2 exceeds the connection force between the reinforcing plate 3 and the plate body 1 (this connection force can be, for example, adhesive force or clamping force), the reinforcing plate 3 can be detached from the plate body 1, thereby opening the exhaust port 110 to achieve the purpose of relieving pressure through the exhaust port 110.

[0033] Exemplarily, in some implementations, reference is made to Figure 4 As shown, the reinforcing plate 3 can be bonded to the plate body 1 through the adhesive layer 7, which has high reliability and is easy to install and arrange. At the same time, the lightweight adhesive layer 7 is also conducive to the lightweight design of the entire battery pack.

[0034] It should be noted that the bonding strength at the interface between the reinforcing plate 3 and the plate body 1 can be σ. When the battery cell 6 experiences thermal runaway, the pressure inside the exhaust channel 2 is P. To achieve separation of the reinforcing plate 3 from the plate body 1, it is necessary to ensure that... Thus, the pressure within the exhaust channel 2 can push open the reinforcing plate 3 to achieve pressure relief. Here, n is the number of exhaust ports 110 covered by a single reinforcing plate 3, r is the radius of the exhaust port 110 along the first direction, and R is the radius of the reinforcing plate 3 along the first direction. Based on this, in some embodiments, the adhesive layer 7 can be formed from one of polyurethane sealant, EVA hot melt adhesive, acrylic adhesive, anaerobic adhesive, silicone rubber adhesive, or polyvinyl acetate emulsion adhesive. This ensures a high bonding strength between the reinforcing plate 3 and the plate body 1 without affecting the pressure relief achieved by flushing off the reinforcing plate 3 with air pressure after thermal runaway.

[0035] Of course, the specific embodiment in which the reinforcing plate 3 is bonded to the plate body 1 via the adhesive layer 7 is exemplary. In some alternative embodiments not shown, the reinforcing plate 3 can also be fastened to the plate body 1 via, for example, a snap-fit ​​structure. In this way, after thermal runaway, when the pressure in the exhaust channel 2 exceeds the snap-fit ​​force between the reinforcing plate 3 and the plate body 1, the reinforcing plate 3 can be pushed open to achieve the purpose of pressure relief. This disclosure is not limited thereto, and those skilled in the art can adaptively design specific structural forms for the separable connection between the reinforcing plate 3 and the plate body 1 according to actual application needs.

[0036] In order to reduce the influence of the exhaust port 110 on the overall structural strength of the plate body 1, in some embodiments, as shown in Figure 4 The exhaust port 110 can be filled with a sealing member 4, which blocks the exhaust port 110 to improve the structural strength of the plate body 1 and reduce the influence of the exhaust port 110 on the overall structural strength of the plate body 1. At the same time, since the sealing member 4 blocks the exhaust port 110, it can prevent external impurities outside the battery pack from entering the inside of the battery pack, thereby ensuring stable operation of the battery pack and improving the safety and sealing performance of the battery pack.

[0037] In addition, it should be noted that the sealing member 4 can be, for example, a sealant filled in the exhaust port 110, and the sealant is configured to be melted by the high-temperature and high-pressure gas or high-temperature conductive polymer sprayed from the pressure relief member 610 of the battery cell 6 into the exhaust passage 2 during thermal runaway, thereby opening the exhaust port 110 and flushing away the sealant and the reinforcing plate 3 under high pressure to achieve pressure relief. Alternatively, the sealant can also be configured to be directly flushed away by the high-pressure gas during thermal runaway, i.e., the sealant and the reinforcing plate 3 are directly flushed away at the same time under high pressure to achieve pressure relief, which is not limited in the present disclosure. The purpose is to flush away the sealant to open the exhaust port 110 for pressure relief during thermal runaway.

[0038] The sealant can be the same type of glue as the adhesive layer 7, or it can be a different type of glue, which is not limited in the present disclosure. Those skilled in the art can adaptively design according to actual application requirements.

[0039] Of course, the sealing member 4 can also be configured as a sealing block pre-formed and filled in, for example, the exhaust port 110. The present disclosure does not make specific limitations on such deformation methods, and the purpose is to be melted by the high-temperature and high-pressure gas or high-temperature conductive polymer sprayed from the pressure relief member 610 of the battery cell 6 into the exhaust passage 2 during thermal runaway, thereby opening the exhaust port 110 and flushing away the sealing member 4 and the reinforcing plate 3 under high pressure to achieve pressure relief. Those skilled in the art can adaptively design according to actual application requirements.

[0040] In addition, in some embodiments, as shown in Figure 3 The number of reinforcing plates 3 can be one or more, and the specific number of reinforcing plates 3 can be adaptively designed by those skilled in the art according to the actual pressure relief efficiency and the shape and size of the plate body 1, for example, the number of reinforcing plates 3 can be 4-25, preferably 6-15, for example, the number of reinforcing plates 3 can be 6 or 8, etc., which is not limited in the present disclosure.

[0041] And, the single reinforcing plate 3 can cover at least one exhaust port 110, and in some embodiments, for example, as shown in Figures 2 to 5 The single reinforcing plate 3 can cover multiple exhaust ports 110, and the multiple exhaust ports 110 are arranged in an array, so that the multiple exhaust ports 110 are arranged in an array, which can make the exhaust ports 110 more evenly distributed, thereby reducing the influence of the exhaust ports 110 on the overall structural strength of the plate body 1, ensuring that the plate body 1 has high overall structural strength, and the multiple exhaust ports 110 also facilitate improving the pressure relief efficiency. The number of the multiple exhaust ports 110 can be, for example, two, three, or four, and the present disclosure is not limited thereto.

[0042] In addition, in some embodiments, as shown in Figure 5 The inner diameter d of the exhaust port 110 can be, for example, 5mm-15mm, preferably 8mm-10mm, for example, the inner diameter d of the exhaust port 110 can be 6mm, 7mm, 8mm, etc., and the present disclosure is not limited thereto. The purpose is to be able to reduce the influence of the exhaust ports 110 on the overall structural strength of the plate body 1, while also being able to ensure high pressure relief efficiency, and those skilled in the art can adaptively design the inner diameter d of the exhaust port 110 according to actual application requirements.

[0043] In addition, in some embodiments, as shown in Figure 5 In a first direction perpendicular to the center line of the exhaust port 110, the minimum distance a between the outer edge of the reinforcing plate 3 and the outer edge of the nearest exhaust port 110 can be 3mm-5mm, so as to ensure that the reinforcing plate 3 and the plate body 1 have high connection strength, while also ensuring that the reinforcing plate 3 has a high coverage area, which is beneficial to improving the sealing effect between the reinforcing plate 3 and the plate body 1.

[0044] For example, as shown in Figure 5 The multiple exhaust ports 110 can be arranged in, for example, a ring array, and the multiple exhaust ports 110 are located within a virtual circle 8, and the outer edges of the multiple exhaust ports 110 are tangentially arranged with the virtual circle 8, wherein considering the size of the outer shape of the plate body 1, the inner diameter D of the virtual circle 8 in the direction perpendicular to the first direction can be, for example, 25mm-80mm, preferably 30mm-50mm, for example, the inner diameter D of the virtual circle 8 in the direction perpendicular to the first direction can be 30mm, 40mm, 50mm, etc., and the present disclosure is not limited thereto. Those skilled in the art can adaptively design the inner diameter D of the virtual circle 8 in the direction perpendicular to the first direction according to actual application requirements. Based on this, the minimum distance a between the outer edge of the reinforcing plate 3 and the outer edge of the nearest exhaust port 110 can be, for example, the distance between the outer edge of the reinforcing plate 3 and the virtual circle 8, and the present disclosure is not limited thereto.

[0045] It should be noted that the specific shape of the reinforcing plate 3 and the exhaust port 110 is not limited in the present disclosure, for example, it can be circular or square, and those skilled in the art can adaptively design according to the actual application requirements. In addition, the spacing distance between the two adjacent reinforcing plates 3 and the thickness dimension of the reinforcing plate 3 along the center line of the exhaust port 110 are not limited in the present disclosure, and those skilled in the art can adaptively design according to the actual application requirements. For example, the thickness dimension of the reinforcing plate 3 along the center line of the exhaust port 110 can be the same as the thickness dimension of the plate body 1 along the center line of the exhaust port 110, which helps to improve the connection reliability between the reinforcing plate 3 and the plate body 1. The present disclosure is not limited to this.

[0046] In addition, the center line of the exhaust port 110 can be a virtual line passing through the center of the exhaust port 110 and perpendicular to the plate surface of the plate body 1.

[0047] According to a second aspect of the present disclosure, a battery pack is provided, which comprises a housing 5 comprising the bottom plate of the battery pack provided in the first aspect, so as to reduce the possibility of misopening of the exhaust port of the exhaust passage of the battery pack due to external environmental factors, and improve the reliability and safety of the battery pack. In addition, the battery pack also has all the beneficial effects of the bottom plate of the battery pack provided in the first aspect, which will not be repeated here.

[0048] In some embodiments, referring to Figure 1 As shown, the housing 5 can comprise a bottom plate assembly 510, which can comprise a first plate 511 and a second plate 512 arranged oppositely, and an exhaust passage 2 is formed between the first plate 511 and the second plate 512, and the first plate 511 is provided with a pressure relief port 513 for communicating the pressure relief member 610 of the battery monomer 6 and the exhaust passage 2, and the second plate 512 is the above-mentioned bottom plate. In this way, through the above arrangement, when the battery monomer 6 occurs thermal runaway, the reinforcing plate 3 can be pried open by the sudden increase in air pressure in the exhaust passage 2, so as to achieve the purpose of pressure relief of the battery pack through the bottom plate assembly 510. At the same time, due to the existence of the reinforcing plate 3 and the sealing member 4, when the battery pack is working normally, for example, water vapor and external impurities can also be prevented from entering the battery pack through the bottom plate assembly 510 to cause the insulation and pressure resistance of the battery pack to fail, thereby improving the safety of the battery pack.

[0049] In addition, in some embodiments, referring to Figure 4 As shown, along the center line of the exhaust port 110 (for example, referring to the up-down direction of the figure in Figure 4 , the exhaust port 110 can be arranged opposite to the position of the pressure relief member 610 and the pressure relief port 513, that is, it can be understood that, for example, as shown in Figure 3 and Figure 4As shown, the exhaust ports 110 can be arranged in multiple groups, for example, can be arranged in six groups, and the six groups of exhaust ports 110 can be respectively arranged opposite to the positions of the pressure relief pieces 610 of any six battery monomers 6 in the plurality of battery monomers 6 in the battery pack, while the six groups of exhaust ports 110 can be respectively arranged opposite to the positions of the six pressure relief ports 513 on the first plate 511 corresponding to the positions of the six pressure relief pieces 610 of the battery monomers 6. In this way, when the battery monomers 6, for example, undergo thermal runaway, the high-temperature and high-pressure gas or high-temperature conductive polymer spouted into the exhaust passage 2 from the pressure relief pieces 610 of the battery monomers 6 can directly act on the exhaust ports 110 through the pressure relief ports 513, which is beneficial to ensure that the sealing member 4 and the reinforcing plate 3 are quickly washed away to achieve the purpose of pressure relief, thereby improving the safety of the battery pack.

[0050] In the above six groups of exhaust ports 110, the number of exhaust ports 110 can be one or more, and the present disclosure does not specifically limit such a variant. In addition, in some alternative embodiments not shown, the exhaust ports 110 can also not be arranged opposite to the positions of the pressure relief pieces 610 and the pressure relief ports 513 along the center line of the exhaust ports 110, and the present disclosure does not specifically limit such a variant. The purpose is to ensure that when the battery monomers 6, for example, undergo thermal runaway, the sealing member 4 and the reinforcing plate 3 can be washed away to achieve the purpose of pressure relief, and those skilled in the art can adaptively design according to actual application requirements.

[0051] It should be noted that the first plate 511 can include a cooling plate, which can be, for example, a liquid cooling plate, to cool the plurality of battery monomers 6 through the liquid cooling plate, and can play a cooling role when thermal runaway occurs. The pressure relief port 513 can be provided on the cooling plate.

[0052] Alternatively, the first plate 511 can include a plate body for supporting the plurality of battery monomers 6 to play a supporting role, and the pressure relief port 513 can be provided on the plate body.

[0053] In addition, the pressure relief piece 610 can adopt any suitable structure according to actual application requirements, for example, the pressure relief piece 610 can be, for example, a pressure relief valve, a pressure relief valve, or a safety valve, and the present disclosure does not specifically limit this.

[0054] In addition, the battery monomer 6 can be configured in the form of, for example, a cell, which is the smallest discharge power source in the battery device, and includes a positive and negative electrode isolation film and a cell shell.

[0055] Optionally, in some embodiments, with reference to Figure 1As shown, the shell 5 can further include a frame 520 arranged on the bottom plate assembly 510, and the bottom plate assembly 510 and the frame 520 enclose a receiving groove for placing the battery monomer 6. It should be noted that in some embodiments not shown, the plate body of the frame 520 can also include the bottom plate structure provided in the first aspect, so as to be able to release pressure through the frame 520 when the battery monomer 6 is in thermal runaway.

[0056] According to a third aspect of the present disclosure, a power utilization device is provided, which includes the battery pack provided in the second aspect. In addition, the power utilization device has all the beneficial effects of the battery pack provided in the second aspect, which will not be described herein again.

[0057] In some exemplary application scenarios, the power utilization device can be a vehicle, which can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc., which will not be limited in the present disclosure.

[0058] Of course, in other application scenarios, the power utilization device can also be a carrier that needs to be powered by a battery pack, such as in the field of energy storage, aerospace, or water transportation, etc.

[0059] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0060] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations will not be described again in the present disclosure.

[0061] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as it does not deviate from the idea of the present disclosure, and it should also be considered as disclosed in the present disclosure.

Claims

1. A base plate for a battery pack, characterized in that, The base plate includes: A plate body, wherein the plate body is provided with an exhaust port for communicating with the exhaust channel of the battery pack; and A reinforcing plate is detachably connected to the outer wall surface of the plate facing the outside of the battery pack and covers the exhaust port.

2. The base plate of the battery pack according to claim 1, characterized in that, The exhaust port is filled with a sealing element, which seals the exhaust port.

3. The base plate of the battery pack according to claim 1 or 2, characterized in that, The number of the reinforcing plates is one or more, and a single reinforcing plate covers at least one of the exhaust ports.

4. The base plate of the battery pack according to claim 1 or 2, characterized in that, A single reinforcing plate covers a plurality of exhaust ports, which are arranged in an array.

5. The base plate of the battery pack according to claim 4, characterized in that, The inner diameter of the exhaust port is 5mm-15mm.

6. The base plate of the battery pack according to claim 4, characterized in that, Along a first direction perpendicular to the center line of the exhaust port, the minimum distance between the outer edge of the reinforcing plate and the outer edge of the nearest exhaust port is 3mm-5mm.

7. The base plate of the battery pack according to claim 1 or 2, characterized in that, The reinforcing plate is bonded to the plate body by an adhesive layer.

8. The base plate of the battery pack according to claim 7, characterized in that, The adhesive layer is formed from one of polyurethane sealant, EVA hot melt adhesive, acrylic adhesive, anaerobic adhesive, silicone rubber adhesive or polyvinyl acetate emulsion adhesive.

9. A battery pack, characterized in that, It includes a housing, the housing comprising the base plate of the battery pack according to any one of claims 1-8.

10. The battery pack according to claim 9, characterized in that, The housing includes a base plate assembly, which includes a first plate and a second plate arranged opposite to each other. The exhaust channel is formed between the first plate and the second plate. The first plate is provided with a pressure relief component for connecting the battery cell and the pressure relief port of the exhaust channel. The second plate is the base plate.

11. The battery pack according to claim 10, characterized in that, Along the center line of the exhaust port, the exhaust port is arranged relative to the pressure relief component and the pressure relief port.

12. An electrical appliance, characterized in that, Includes the battery pack described in any one of claims 9-11.

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