Battery pack and electric device

Abstract

The utility model discloses a battery pack and an electric device, and relates to the technical field of batteries. The battery pack comprises a battery pack and a battery box. The battery box comprises a box body with a containing cavity, a bottom protection plate arranged at the bottom of the box body, and a sealing piece arranged between the bottom protection plate and the sealing surface of the box body. An exhaust hole is formed in the bottom of the box body, an exhaust channel communicated with the exhaust hole is defined by the bottom protection plate and the bottom of the box body, the exhaust hole is used for exhausting gas released by the battery pack into the exhaust channel, and a shielding part is arranged on the sealing surface and used for shielding the sealing piece. According to the battery pack provided by the invention, the shielding part is arranged on the sealing surface, and the shielding part shields the sealing element, so that part of the impact of the external environment on the sealing element can be borne, and the negative influence on the sealing element is reduced, thereby reducing the risk of sealing failure at the joint of the box body and the bottom protection plate, prolonging the service life of the sealing element and improving the reliability of the battery pack. And the reliability and the safety of the battery pack are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] In the related art, a sealing ring is usually used to seal the connection between the bottom guard plate and the box body of the battery box to improve the IP protection level of the battery pack. However, the sealing ring is exposed to the outside. As the use time of the electric vehicle carrying the battery pack increases and it is affected by complex working conditions, the sealing failure at the connection between the bottom guard plate and the box body increases, resulting in an increased risk of moisture seeping into the battery pack, posing a major safety hazard. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a battery pack and an electrical device, aiming to solve the technical problem that the sealing ring is exposed to the outside, so that the seal is affected and corroded by the external environment, the effective life of the seal is reduced, and the sealing connection is prone to failure, resulting in an increased risk of moisture infiltration into the battery pack.

[0004] To achieve the above purpose, the technical solution adopted in this application is as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising:

[0006] Battery pack;

[0007] A box body, having a receiving cavity for placing the battery pack, a vent hole communicating with the receiving cavity is opened at the bottom of the box body, and the bottom of the box body has a sealing surface, a bottom guard plate is arranged on the sealing surface, and defines an exhaust channel communicating with the vent hole with the box body, the vent hole is used to discharge the gas released by the battery pack into the exhaust channel, and the sealing member is arranged between the bottom guard plate and the sealing surface, and is used to seal the battery pack;

[0008] In which, the box body has a height direction, and a shielding portion is arranged on the sealing surface, the shielding portion is used to shield the sealing member, the shielding portion is arranged along the circumference of the sealing member, and the side of the shielding portion facing away from the sealing surface extends along the height direction of the box body, and the distance from the side of the shielding portion facing away from the sealing surface to the sealing surface is greater than the distance from the side of the sealing member facing away from the sealing surface to the sealing surface.

[0009] In one of the embodiments of the first aspect, a sealing groove is provided on the bottom of the box body and / or the bottom guard plate, and at least a portion of the sealing member is accommodated in the sealing groove.

[0010] In one embodiment of the first aspect, the sealing groove is an annular sealing groove, and the sealing member is an annular sealing member adapted to fit the annular sealing groove.

[0011] In one embodiment of the first aspect, the sealing member is made of an elastic material, and a gap is formed between the sealing member and the shielding portion.

[0012] In one embodiment of the first aspect, the sealing member is made of a non-elastic material, a first sealing layer is provided between the sealing member and the bottom guard plate, and a second sealing layer is provided between the sealing member and the sealing surface;

[0013] In the height direction of the box body, the distance from the side of the sealing member away from the sealing surface to the sealing surface is A1, and the distance from the side of the shielding portion away from the sealing surface to the sealing surface is L, satisfying: L>A1.

[0014] In one embodiment of the first aspect, the bottom guard plate includes a main body portion and a contact portion connected to each other, the main body portion and the box body define the exhaust passage, and the contact portion presses against a side of the sealing member away from the sealing surface;

[0015] In the height direction of the box body, the distance from the side of the contact portion away from the seal to the sealing surface is A2, and the distance from the side of the shielding portion away from the sealing surface to the sealing surface is L, satisfying: 1<L / A2<1.2.

[0016] In one of the embodiments of the first aspect, the bottom guard plate also includes a transition portion, which is connected between the main body portion and the contact portion, so that in the height direction of the box body, the distance from the side of the main body facing the exhaust hole to the sealing surface is greater than the distance from the side of the contact portion facing the sealing surface to the sealing surface.

[0017] In one of the embodiments of the first aspect, the bottom guard plate further includes a bending portion, the bending portion is connected to a side of the contact portion away from the main body portion, and the bending portion is bent in a direction away from the sealing component.

[0018] In one of the embodiments of the first aspect, the battery pack also includes a fastener, which includes a fixing portion and a pressing portion that are connected to each other, the fixing portion passes through the bottom guard plate and the seal and is connected to the box body, and the pressing portion is arranged to press against the bottom guard plate.

[0019] In one embodiment of the first aspect, the sealing member is made of an elastic material, and the battery box further includes a limiting member;

[0020] In the height direction of the box body, the distance between the two opposite sides of the limiter is D, and the distance between the two opposite sides of the seal in the initial state is H, satisfying: 0.3≤D / H≤0.7, and the limiter is located between the bottom guard plate and the sealing surface, for limiting the compression amount of the seal.

[0021] In one of the embodiments of the first aspect, the bottom guard plate includes a first guard plate layer and a second guard plate layer which are stacked, the first guard plate layer is located between the seal and the second guard plate layer, the second guard plate layer is provided with a groove passing through it, the fixing portion is passed through the first guard plate layer and the seal and is connected to the box body, and the pressing portion is located in the groove and presses against a side of the first guard plate layer away from the seal.

[0022] In one embodiment of the first aspect, the box body includes a top cover, a surrounding plate and an exhaust plate, the top cover is connected to one end of the surrounding plate to form the accommodating cavity, the exhaust plate is detachably connected to one end of the surrounding plate away from the top cover, the exhaust plate is provided with the exhaust hole, and the exhaust channel is formed between the exhaust plate and the bottom guard plate; or

[0023] The box body is made of metal material in one piece.

[0024] In a second aspect, an embodiment of the present application further provides an electrical device, comprising a battery pack in any of the above embodiments.

[0025] The beneficial effects of this application are:

[0026] The present application provides a battery pack, including a battery group and a battery box. The battery box includes a box body, a bottom guard plate and a seal. An exhaust hole is opened at the bottom of the box body, and an exhaust channel is formed between the bottom guard plate and the box body. In this way, high-temperature and high-pressure gases released during the use of the battery pack can be evacuated from the exhaust hole to the exhaust channel, thereby improving the safety of use.

[0027] On this basis, by setting a shielding part on the sealing surface, the shielding part shields the seal, and the shielding part is set along the circumference of the seal, the side of the shielding part away from the sealing surface extends along the height direction of the box, and the distance from the side of the shielding part away from the sealing surface to the sealing surface is greater than the distance from the side of the seal away from the sealing surface to the sealing surface. In this way, the shielding part can bear part of the impact of the external environment on the seal, reducing the negative impact on the seal. In this way, the risk of sealing failure at the connection between the box and the bottom guard plate is reduced, the service life of the seal is extended, and the reliability and safety of the battery pack are improved.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the exploded structure of a battery pack from one perspective in some embodiments of the present application is shown;

[0031] Figure 2 A schematic diagram of the exploded structure of a battery pack from another perspective in some embodiments of the present application is shown;

[0032] Figure 3 Shows Figure 2 The structural diagram of part A in the figure;

[0033] Figure 4 A schematic diagram of the exploded structure of a battery box from one perspective in some embodiments of the present application is shown;

[0034] Figure 5 Another perspective structural schematic diagram of the battery box in some embodiments of the present application is shown;

[0035] Figure 6 Shows Figure 5 Schematic diagram of the cross-sectional structure at BB in the middle;

[0036] Figure 7 Shows Figure 6 Schematic diagram of the structure of part C;

[0037] Figure 8 Shows Figure 7 Schematic diagram of the decomposition structure under perspective;

[0038] Fig. 9 A partial structural schematic diagram of the bottom guard plate in some embodiments of the present application is shown;

[0039] Fig.10 Shows Figure 7 A schematic diagram of the structure of the midsole guard plate including the bending portion;

[0040] Fig.11 Shows Figure 7 A schematic diagram of the structure of the midsole guard plate including a first guard plate layer and a second guard plate layer.

[0041] Description of main component symbols:

[0042] 1000-battery pack; 100-battery box; 110-box; 111-top cover; 112-enclosure; 1121-accommodation chamber; 1122-opening; 1123-sealing surface; 1124-shielding portion; 1125-sealing groove; 1126-threaded hole; 113-exhaust plate; 1131-exhaust hole; 120-limiting member; 121-second through hole; 130-sealing member; 131-interval Gap; 132-first through hole; 140-bottom guard plate; 141-exhaust channel; 142-connecting hole; 143-main body; 144-transition part; 145-contact part; 146-bending part; 1401-first guard plate layer; 1402-second guard plate layer; 14021-groove; 150-fastener; 151-fixing part; 152-pressing part; 200-battery pack; 210-explosion-proof valve. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] like Figure 4 As shown, an embodiment of the present application provides a battery pack 1000, which relates to the field of battery technology and is mainly used in electrical devices such as electric vehicles, energy storage power stations, ships, and spacecraft.

[0049] Combination Figures 5 to 7 As shown, the battery pack 1000 mainly includes: a battery group 200 and a battery box 100 .

[0050] Among them, the battery box 100 includes a box body 110, a bottom guard plate 140 and a seal 130. The box body 110 has a accommodating cavity 1121 for placing the battery pack 200. The bottom of the box body 110 is provided with an exhaust hole 1131 connected to the accommodating cavity 1121, and the bottom of the box body 110 has a sealing surface 1123. The bottom guard plate 140 is arranged on the sealing surface 1123 and defines an exhaust channel 141 with the box body 110. The exhaust channel 141 is connected to the exhaust hole 1131. The exhaust hole 1131 is used to discharge the gas released by the battery pack 200 into the exhaust channel 141.

[0051] The seal 130 is disposed between the bottom guard plate 140 and the sealing surface 1123, and is used to seal the battery pack 1000. The box body 110 has a height direction, and a shielding portion 1124 is disposed on the sealing surface 1123. The shielding portion 1124 is used to shield the seal 130. The shielding portion 1124 is disposed along the circumference of the seal 130. The side of the shielding portion 1124 facing away from the sealing surface 1123 extends along the height direction of the box body 110. The distance from the side of the shielding portion 1124 facing away from the sealing surface 1123 to the sealing surface 1123 is not less than the distance from the side of the seal 130 facing away from the sealing surface 1123 to the sealing surface 1123.

[0052] In the related art, a sealing ring is usually used to seal the connection between the bottom guard plate and the box body of the battery box to improve the IP protection level (Ingress Protection) of the battery pack. However, the sealing ring is exposed to the outside. As the electric vehicle carrying the battery pack is used for a longer period of time and is affected by complex working conditions, the sealing failure at the connection between the bottom guard plate and the box body increases, causing the risk of moisture seeping into the battery pack, posing a major safety hazard.

[0053] It can be understood that the battery pack 1000 provided in this embodiment has an exhaust hole 1131 at the bottom of the box body 110 and forms an exhaust channel 141 between the bottom guard plate 140 and the box body 110. In this way, the high-temperature and high-pressure gas released by the battery pack 200 during use can be evacuated from the exhaust hole 1131 to the exhaust channel 141, thereby improving the safety of the battery pack 1000.

[0054] On this basis, by setting a shielding portion 1124 on the sealing surface 1123, the shielding portion 1124 shields the seal 130, and the shielding portion 1124 is set along the circumference of the seal 130, the side of the shielding portion 1124 away from the sealing surface 1123 extends along the height direction of the box 110, and the distance from the side of the shielding portion 1124 away from the sealing surface 1123 to the sealing surface 1123 is greater than the distance from the side of the seal 130 away from the sealing surface 1123 to the sealing surface 1123, so that the shielding portion 1124 can bear part of the impact of the external environment on the seal 130, reducing the negative impact on the seal 130. In this way, the risk of sealing failure at the connection between the box 110 and the bottom guard plate 140 is reduced, the service life of the seal 130 is extended, and the reliability and safety of the battery pack 1000 are improved.

[0055] It should be mentioned that the above “the shielding portion 1124 shields the sealing member 130 ” can be understood as the shielding portion 1124 shielding the edge contour of the sealing member 130 along the circumference of the sealing member 130 , for example Figure 7As shown, the side of the seal 130 close to the shielding portion 1124 is the side in contact with the external environment. The shielding portion 1124 is provided to prevent the external environment (foreign matter, water vapor, oil stains, sewage, etc.) from directly acting on the contact side, so the shielding portion 1124 shields the contact side along the circumference of the seal 130. Preferably, the positive projection of the contact side of the seal 130 along the extension direction of the perpendicular shielding portion 1124 falls completely on the side of the shielding portion 1124 close to the seal 130, so that the contact side of the seal 130 is not directly exposed to the external environment.

[0056] Of course, there is also a situation where the direct projection of the contact side of the seal 130 along the extension direction of the vertical shielding portion 1124 falls on the side of the shielding portion 1124 close to the seal 130. The effect is also better than the solution in which the contact side of the seal 130 in the battery pack is directly exposed to the external environment.

[0057] In addition, the above-mentioned “circumferential direction of the seal 130” can be understood as the direction of a circle around the accommodating cavity 1121. The side of the shielding portion 1124 that is away from the sealing surface 1123 extends along the height direction of the box body 110, which does not mean that the height direction of the box body 110 and the extension direction of the shielding portion 1124 are parallel in a mathematical sense, but means that when the angle between the height direction of the box body 110 and the extension direction of the shielding portion 1124 is between 0°-15° (including 0° and 15°), it can be understood as parallel, as long as it does not affect the installation of the bottom guard plate 140 to the bottom of the box body 110, and there is a gap between the bottom guard plate 140 and the shielding portion 1124 after installation.

[0058] It should be mentioned that, for the above-mentioned method in which the gas released from the battery pack 200 is discharged into the exhaust channel 141 through the exhaust hole 1131, preferably, the explosion-proof valve 210 of each single cell of the battery pack 200 corresponds to a exhaust hole 1131, and the bottom wall of the single cell is against the bottom of the box body 110, so that when one of the single cells has a thermal runaway valve explosion, the released gas can directly enter the exhaust channel 141 through the exhaust hole 1131, so that the heat can be prevented from spreading, so that the safety of the battery pack 1000 is more effectively improved. Of course, the battery pack 200 can also form a gap space with the exhaust hole 1131. When one or more single cells in the battery pack 200 have a thermal runaway valve explosion, the gas is first discharged to the gap space, and then enters the exhaust channel 141 through the exhaust hole 1131.

[0059] like Figure 3 and Fig. 9 As shown, in one embodiment, a sealing groove 1125 is provided on the bottom of the box body 110 and / or the bottom guard plate 140 , and at least a portion of the sealing member 130 is received in the sealing groove 1125 .

[0060] It should be noted that when the sealing groove 1125 is provided at the bottom of the box body 110, the sealing surface 1123 is the bottom surface of the sealing groove 1125. When the sealing groove 1125 is provided on the bottom guard plate 140, the sealing surface 1123 is the surface of the bottom of the box body 110 surrounding the exhaust hole 1131.

[0061] Combination Figure 2 and Figure 3 As shown, for example, a sealing groove 1125 is provided at the bottom of the box body 110, so that a portion of the sealing member 130 is received in the sealing groove 1125. Fig. 9 As shown, a sealing groove 1125 may also be opened on the bottom guard plate 140 so that a portion of the sealing member 130 is received in the sealing groove 1125 .

[0062] It should be understood that the matching method of the seal 130 and the sealing groove 1125 is not limited to a portion of the seal 130 being accommodated in the sealing groove 1125, and the entire seal 130 can also be completely accommodated in the sealing groove 1125. These matching methods can make the seal 130 and the sealing surface 1123 abut against each other to increase the sealing effect of the seal 130. No specific limitation is made on the matching method of the seal 130 and the sealing groove 1125 herein.

[0063] In this embodiment, the seal 130 is disposed between the bottom guard plate 140 and the sealing surface 1123 at the bottom of the box body 110, and a sealing groove 1125 is opened at the bottom of the box body 110 and / or on the bottom guard plate 140, so that at least a portion of the seal 130 is accommodated in the sealing groove 1125, thereby providing further protection for the connection between the bottom guard plate 140 and the bottom of the box body 110.

[0064] Furthermore, the sealing groove 1125 is an annular sealing groove, and the sealing member 130 is an annular sealing member adapted to the annular sealing groove 1125, so that a tighter sealing effect can be formed around the box body 110, reducing the risk of sealing failure. It is understandable that the sealing groove 1125 and the sealing member 130 are not limited to annular structures, and the sealing member 130 can also be a U-shaped sealing member, a V-shaped sealing member or a special-shaped structure, and the structures of the sealing member 130 and the sealing groove 1125 are not specifically limited here.

[0065] In another embodiment, the bottom guard plate 140 has a flat surface on the side facing the box body 110, and the seal 130 is located between the flat surface and the sealing surface 1123 of the box body 110. In this way, there is no need to set a sealing groove 1125, and the battery pack 1000 can also be sealed.

[0066] like Figure 7 As shown, in one embodiment, the sealing member 130 is made of an elastic material, and a gap 131 is formed between the sealing member 130 and the shielding portion 1124 .

[0067] In this embodiment, the seal 130 is made of elastic material so that the seal 130 has compression deformation capability. On this basis, a gap 131 is formed between the seal 130 and the shielding portion 1124. The gap 131 can absorb the size of the seal 130 after compression deformation, so that the seal 130 has sufficient deformation after being compressed to ensure that it can form a close contact with the sealing surface 1123 and the bottom guard plate 140, thereby improving the sealing effect of the connection between the box body 110 and the bottom guard plate 140.

[0068] Exemplarily, the elastic material is silicone foam, EPDM rubber, silicone, etc. These materials enable the seal 130 to have good compression deformation ability.

[0069] like Figure 7 As shown, further, in the height direction of the box body 110, when the seal 130 is in a compressed and fixed state, the distance from the side of the seal 130 away from the sealing surface 1123 to the sealing surface 1123 is A0, and the distance from the side of the shielding portion 1124 away from the sealing surface 1123 to the sealing surface 1123 is L, satisfying: L>A0.

[0070] It should be noted that the above “the seal 130 is in a compressed and fixed state” refers to a state when the bottom guard plate 140 is locked with the bottom of the box body 110 so that the seal 130 is compressed by the bottom guard plate 140 and the box body 110 .

[0071] For example, according to clause 14.2.9 of GB / T 4208-2017, the battery pack 1000 is subjected to an IPX9 water spray test, and the test requirements and test pass conditions are as follows:

[0072] 1. Test requirements:

[0073] 1) Spray direction: The nozzle of the test equipment sprays from all directions to cover the entire surface of the battery box 100, and the spray angle should be as perpendicular to the spray surface as possible;

[0074] 2) The distance between the nozzle and the surface under test is (175±25) mm under test conditions;

[0075] 3) The water temperature should be maintained at (80±5)℃;

[0076] 4) Based on the calculable area of ​​the battery box 100 (including any mounting surface), the test duration is 1min / m 2 , at least 3 minutes.

[0077] 2. Test pass conditions:

[0078] 1) No fire or explosion;

[0079] 2) Insulation resistance is greater than 100Ω / V and leakage current is less than 1mA;

[0080] 3) The air tightness test of the battery system and the water cooling system is normal, there is no water seepage inside the high and low voltage connectors, and there should be no water ingress inside the battery pack 1000;

[0081] 4) After the test, the battery management system (BMS) should function normally, and there should be no errors in the collection of voltage, temperature, etc.

[0082] After testing, the IPX9 water spray test results of the battery pack 1000 are shown in Table 1.

[0083]

[0084] It can be seen from Table 1 that when: L>A0, that is, the shielding portion 1124 at least protrudes a portion beyond the seal 130 in the compressed state, the IPX9 water spray test of the battery pack 1000 is passed, and the sealing effect of the seal 130 can meet the safety requirements of the battery pack 1000.

[0085] Combination Figures 5 to 7 As shown, in one embodiment, the seal 130 is made of non-elastic material, a first sealing layer is arranged between the seal 130 and the bottom guard plate 140, and a second sealing layer is arranged between the seal 130 and the sealing surface 1123. In the height direction of the box body 110, the distance from the side of the seal 130 away from the sealing surface 1123 to the sealing surface 1123 is A1, and the distance from the side of the shielding portion 1124 away from the sealing surface 1123 to the sealing surface 1123 is L, satisfying: L>A1.

[0086] In this embodiment, a first sealing layer is provided between the seal 130 and the bottom guard plate 140, and a second sealing layer is provided between the seal 130 and the sealing surface 1123. At the same time, L>A1, that is, the distance between the side of the shielding portion 1124 facing away from the sealing surface 1123 and the sealing surface 1123 is greater than the distance between the side of the seal 130 facing away from the sealing surface 1123 and the sealing surface 1123. This allows the shielding portion 1124 to completely cover the seal 130, thereby more effectively preventing the external environment from directly affecting the seal 130, and further reducing the risk of sealing failure at the connection between the box body 110 and the bottom guard plate 140.

[0087] Exemplarily, the non-elastic material is plastic, metal, ceramic, composite material, etc.

[0088] Continue reading Figure 7In one embodiment, the bottom guard plate 140 includes a main body 143 and a contact portion 145 connected to each other, the main body 143 and the box body 110 define an exhaust passage 141, and the contact portion 145 presses against the side of the seal 130 away from the sealing surface 1123. In the height direction of the box body 110, the distance from the side of the contact portion 145 away from the sealing member 130 to the sealing surface 1123 is A2, and the distance from the side of the shielding portion 1124 away from the sealing surface 1123 to the sealing surface 1123 is L, which satisfies: 1<L / A2<1.2.

[0089] For example, the seal 130 may be made of an elastic material or a non-elastic material. It should be noted that the sealing failure order ranking of the battery pack 1000 can be obtained through a water wading cycle test, thereby reflecting the influence of the parameter L / A2 on the sealing effect.

[0090] In this embodiment, by controlling L / A2 within the range of 1 to 1.2, that is, the distance between the side of the shielding portion 1124 facing away from the sealing surface 1123 and the sealing surface 1123 is 1 to 1.2 times the distance between the side of the contact portion 145 facing away from the seal 130 and the sealing surface 1123, the shielding portion 1124 covers both the seal 130 and the contact portion 145 of the bottom guard plate 140, so as to more effectively prevent the external environment from directly affecting the seal 130, thereby further reducing the risk of sealing failure at the connection between the box body 110 and the bottom guard plate 140. If the L / A2 ratio exceeds 1.2, the shielding portion 1124 will have excessive redundancy in material, which will relatively increase the manufacturing cost of the product.

[0091] Here, the distance between the side of the shielding portion 1124 facing away from the sealing surface 1123 and the sealing surface 1123 is equal to the distance between the side of the contact portion 145 facing away from the sealing member 130 and the sealing surface 1123 as the cost reference benchmark, that is, the cost coefficient is 1 at this time. The following cost increase rate comparison table 2 is prepared according to the change in the ratio of L to A2. The cost increase rate here refers to the percentage of cost that increases relatively with the increase in the size of the shielding portion 1124. At the same time, according to clause 14.2.9 of GB / T 4208-2017, the battery pack 1000 is subjected to an IPX9 water spray test.

[0092]

[0093] It can be seen from Table 2 that the water spray test of test groups 1-7 all passed. When the L / A2 ratio is controlled within the range of 1 to 1.2, the cost increase rate is between 0-20%, which is within an acceptable cost range. However, when the L / A2 ratio exceeds 1.2, the cost increase rate exceeds 20%, and the manufacturing cost of the battery pack 1000 is relatively high. Therefore, 1<L / A2<1.2 is preferred.

[0094] Furthermore, if Figure 7 and Fig. 9 As shown, the bottom guard plate 140 also includes a transition portion 144, which is connected between the main body 143 and the contact portion 145, so that in the height direction of the box body 110, the distance from the side of the main body 143 facing the exhaust hole 1131 to the sealing surface 1123 is greater than the distance from the side of the contact portion 145 facing the sealing surface 1123 to the sealing surface 1123. In this way, the capacity of the exhaust channel 141 can be increased, which is beneficial to the evacuation of the gas released from the battery pack 200, and further improves the safety of the battery pack 1000.

[0095] Of course, for the above embodiment, the main body 143 can also be directly connected to the contact portion 145 so that the bottom guard plate 140 is in a straight plate shape. The straight plate-shaped bottom guard plate 140 can also form an exhaust passage 141 between the bottom of the box body 110 .

[0096] like Fig.10 As shown, further, the bottom guard plate 140 also includes a bending portion 146, which is connected to the side of the contact portion 145 away from the main body portion 143, and the bending portion 146 is bent in a direction away from the seal 130. In this way, the bending portion 146 cooperates with the shielding portion 1124 to further reduce the possibility of the external environment directly affecting the seal 130, thereby better achieving the protection effect on the battery pack 1000.

[0097] For example, the bending portion 146 can be integrally formed with the contact portion 145, or can be connected by welding. At the same time, the bending portion 146 can be in surface contact with the shielding portion 1124, thereby improving the sealing effect. Of course, there can also be a gap between the bending portion 146 and the shielding portion 1124, so as to reserve space for the installation of the bottom guard plate 140, thereby facilitating the installation of the bottom guard plate 140.

[0098] like Figure 7 As shown, in one embodiment, the battery box 100 also includes a fastener 150, and the fastener 150 includes a fixing portion 151 and a pressing portion 152 that are connected to each other. The fixing portion 151 is passed through the bottom guard plate 140 and the seal 130 and is connected to the box body 110, and the pressing portion 152 is set to press against the bottom guard plate 140.

[0099] In this embodiment, the fixing portion 151 of the fastener 150 is passed through the bottom guard plate 140 and the seal 130 is connected to the box body 110, so that the pressing portion 152 is pressed against the bottom guard plate 140. In this way, the fastener 150 can apply a clamping force to the bottom guard plate 140 and limit the radial direction of the seal 130, so that the assembled structure of the box body 110, the seal 130 and the bottom guard plate 140 is more solid, reducing the risk of displacement and loosening of the seal 130 due to external force, and increasing the sealing reliability.

[0100] Exemplarily, the fastener 150 may be a screw, bolt, rivet or other fastening element. The number of fasteners 150 may be set to multiple according to design requirements, such as two, three, four, five, etc. Multiple fasteners 150 are arranged on the bottom guard plate 140 to achieve a better fastening effect, improve the connection stability between the bottom guard plate 140 and the bottom of the box body 110, and improve the sealing effect of the seal 130 on the connection between the bottom guard plate 140 and the bottom of the box body 110, thereby extending the service life of the battery pack 1000.

[0101] like Figure 8 and Fig. 9 As shown, further, a threaded hole 1126 is provided at the bottom of the box body 110, a connecting hole 142 is provided on the bottom guard plate 140, and the fixing portion 151 of the fastener 150 is a screw rod, and the screw rod is passed through the connecting hole 142 and the sealing member 130, and is threadedly connected with the hole wall of the threaded hole 1126. In this way, the box body 110, the sealing member 130 and the bottom guard plate 140 can be effectively fastened by the threaded cooperation between the screw rod and the threaded hole 1126, thereby improving the sealing reliability. At the same time, this threaded connection method also facilitates the disassembly and assembly of the bottom guard plate 140 and the box body 110, thereby improving the maintenance efficiency of the battery box 100.

[0102] Combination Figures 5 to 7 As shown, further, the seal 130 is made of elastic material, and the battery box 100 also includes a limiter 120. In the height direction of the box body 110, the distance between the two opposite sides of the limiter 120 is D, and the distance between the two opposite sides of the seal 130 in the initial state is H, satisfying: D<H, and the limiter 120 is located between the bottom guard plate 140 and the sealing surface 1123, which is used to limit the compression amount of the seal 130.

[0103] It should be noted that the “distance between two opposite sides of the seal 130 in the initial state” refers to the distance between two opposite sides of the seal 130 when no external force is applied. When the seal 130 is in the form of a thin sheet, the distance H is also referred to as the initial thickness of the seal 130.

[0104] It should be noted that if the compression amount of the seal 130 is too small, the seal 130 cannot fit tightly with the bottom guard plate 140 and the bottom of the box 110, resulting in reduced sealing effect. If the compression amount of the seal 130 is too large, it will cause excessive deformation, which will also result in reduced sealing effect.

[0105] In this embodiment, a limit member 120 is provided between the bottom guard plate 140 and the sealing surface 1123, and a distance D between two opposite sides of the limit member 120 is made greater than a distance H between two opposite sides of the seal 130 in an initial state. In this way, the limit member 120 can abut against the bottom guard plate 140 and the sealing surface 1123, thereby limiting the compression amount of the seal 130, so as to avoid sealing failure of the seal 130 due to excessive compression, thereby improving the safety of the battery pack 1000.

[0106] Furthermore, 0.3≤D / H≤0.7. Exemplarily, the IP protection test method of the battery pack 1000 is as follows: the fastener 150 is locked until the stopper 120 contacts the sealing surface 1123, that is, the fastener 150 cannot be locked any further, and the battery pack 1000 is in a sealed state. A short-time immersion test is performed according to clause 14.2.7 of the national standard GB / T4208-2017. The test requirements and test pass conditions are as follows:

[0107] 1. Test requirements: The battery pack 1000 is completely immersed in water along its height direction and meets the following conditions:

[0108] 1) The lowest point of the battery box 100 with a height less than 850 mm should be 1000 mm below the water surface;

[0109] 2) The highest point of the battery box 100 with a height greater than or equal to 850 mm should be 150 mm below the water surface;

[0110] 3) The temperature difference between the actual water temperature and the test water temperature is no more than 5K;

[0111] 4) The test lasts for 30 minutes.

[0112] 2. Test pass conditions:

[0113] 1) No fire or explosion;

[0114] 2) After 1 hour of water immersion test, the single cell voltage, total voltage, single cell temperature and insulation resistance of the battery pack 1000 are normal;

[0115] 3) The battery pack 1000 is not allowed to get wet (condensation caused by temperature difference does not count as water getting in).

[0116] 4) After the test, the insulation resistance of the battery pack 1000 is not less than 500Ω / V;

[0117] 5) After the test, the battery management system (BMS) functions normally, and there are no errors in data collection such as voltage and temperature.

[0118] After testing, the IP protection test results of the battery pack 1000 are shown in Table 3.

[0119]

[0120] It can be seen from Table 3 that when 0.3≤D / H≤0.7 is satisfied, the IP protection test of the battery pack 1000 is passed, and the sealing effect of the seal 130 can meet the safety requirements of the battery pack 1000.

[0121] Combination Figure 7 and Figure 8 As shown, further, the sealing member 130 is provided with a first through hole 132 for the fixing portion 151 to pass through, the limiting member 120 is received in the first through hole 132 , the limiting member 120 is provided with a second through hole 121 , and is sleeved on the circumference of the fixing portion 151 through the second through hole 121 .

[0122] In this embodiment, a first through hole 132 is opened on the sealing member 130 so that the limit member 120 is accommodated in the first through hole 132. At the same time, a second through hole 121 is opened on the limit member 120 so that the limit member 120 is sleeved on the circumference of the fixing portion 151 through the second through hole 121. In this way, the hole wall of the first through hole 132 and the fixing portion 151 of the fastener 150 can limit the limit member 120 in the radial direction, so that the limit member 120 can only move along the fixing portion 151 in the height direction of the box body 110, thereby avoiding radial displacement of the limit member 120, improving the limiting effect of the limit member 120 on the sealing member 130, and thus improving the sealing performance of the sealing member 130 at the connection between the box body 110 and the bottom guard plate 140.

[0123] Of course, for the above embodiment, the limit member 120 can also be integrally connected to the bottom of the box body 110, such as welding or integral molding, and the projections of the limit member 120 and the seal 130 in the height direction of the box body 110 do not have any overlapping parts, that is, the limit member 120 is not accommodated in the seal 130, so that the limit member 120 can also abut against the bottom guard plate 140 and the sealing surface 1123, so as to limit the compression amount of the seal 130.

[0124] like Fig.11 As shown, further, the bottom guard plate 140 includes a first guard plate layer 1401 and a second guard plate layer 1402 which are stacked, the first guard plate layer 1401 is located between the seal 130 and the second guard plate layer 1402, the second guard plate layer 1402 is provided with a groove 14021 passing through it, the fixing portion 151 is penetrated through the first guard plate layer 1401 and the seal 130, and is connected to the box body 110, the pressing portion 152 is located in the groove 14021, and presses on the side of the first guard plate layer 1401 away from the seal 130.

[0125] Exemplarily, the second protective plate layer 1402 can be connected to the first protective plate layer 1401 by electroplating, welding, bonding, etc., and no specific limitation is imposed on the stacking method of the two.

[0126] In this embodiment, by providing a first protective plate layer 1401 and a second protective plate layer 1402 with a groove 14021, the groove wall of the groove 14021 can limit the circumferential direction of the pressing portion 152. On this basis, the fixing portion 151 is penetrated through the first protective plate layer 1401 and the seal 130 and connected to the box body 110, so that the first protective plate layer 1401 can be fully fitted with the seal 130 to improve the sealing protection effect.

[0127] It should be noted that when the bottom guard plate 140 includes a main body 143, a contact portion 145 and a transition portion 144, the above-mentioned double-layer structure can also be adopted, that is, the main body 143, the contact portion 145 and the transition portion 144 can all be double-layer structures, which will not be repeated here.

[0128] like Figure 1 and Figure 2 As shown, in one embodiment, the box body 110 includes a top cover 111, a surrounding plate 112 and an exhaust plate 113. The top cover 111 is detachably connected to one end of the surrounding plate 112 to form a accommodating cavity 1121. The exhaust plate 113 is detachably connected to one end of the surrounding plate 112 away from the top cover 111. The exhaust plate 113 is provided with an exhaust hole 1131. An exhaust channel 141 is formed between the exhaust plate 113 and the bottom guard plate 140.

[0129] It can be understood that both ends of the enclosure 112 have openings 1122, the top cover 111 is connected to one end of the enclosure 112 to close one of the openings 1122 to form a accommodating cavity 1121, and the exhaust plate 113 is connected to one end of the enclosure 112 away from the top cover 111 to close the other opening 1122.

[0130] In this embodiment, the exhaust plate 113 having the exhaust holes 1131 is connected to the end of the enclosure 112 away from the top cover 111, and an exhaust channel 141 is formed between the exhaust plate 113 and the bottom guard plate 140. In this way, the gas released from the battery pack 200 can be evacuated to the exhaust channel 141 through the exhaust holes 1131 along the bottom direction of the box body 110, thereby improving the safety of the battery pack 200.

[0131] Exemplarily, the exhaust plate 113 may be connected to the end of the enclosure 112 away from the top cover 111 by snapping, screwing, sliding, etc. At the same time, the top cover 111 may also be connected to the enclosure 112 in the above manner.

[0132] It should be noted that the structure of the box 110 is not limited to the detachable manner in the above embodiment. In other embodiments, the box 110 can also be made of metal material in one piece, and the exhaust hole 1131 is directly opened on the bottom surface of the box 110. Metal materials include aluminum, steel, stainless steel, etc.

[0133] like Figure 2 As shown, in one embodiment, the battery pack 200 includes a plurality of single cells, the explosion-proof valve 210 of each single cell is arranged toward the bottom guard plate 140, a plurality of exhaust holes 1131 are arranged, and each exhaust hole 1131 is arranged opposite to the explosion-proof valve 210 of a single cell.

[0134] In the present embodiment, the explosion-proof valve 210 of each single cell is arranged toward the bottom guard plate 140, and at the same time, each exhaust hole 1131 is arranged opposite to the explosion-proof valve 210 of a single cell, that is, each exhaust hole 1131 corresponds to an explosion-proof valve 210. In this way, the gas overflowing from the explosion-proof valve 210 of each single cell can be evacuated into the exhaust channel 141 through the corresponding exhaust hole 1131, thereby reducing the internal pressure of each single cell and ensuring the safety of the battery pack 200.

[0135] It should be noted that in the related art, an exhaust channel is formed between the top cover and the battery pack, so that the gas released by the battery pack is evacuated into the exhaust channel toward the top of the box body. In this way, when the top cover is impacted by high-temperature and high-pressure gas, it is easy to break away from the connection with the enclosure, resulting in poor structural stability of the battery box.

[0136] In the battery pack 1000 provided in this embodiment, the exhaust holes 1131 and the exhaust channels 141 are arranged at the bottom of the box body 110. Since the bottom guard plate 140 bears the weight of the box body 110 and the battery pack 200, the bottom guard plate 140 can absorb the force exerted on it by the gas released from the battery pack 200 by relying on the weight of the box body 110 and the battery pack 200, so that the bottom guard plate 140 is not easily separated from the enclosure 112 when impacted by the gas of the battery pack 200, the structural stability is higher, and the service life of the battery pack 1000 is extended.

[0137] The embodiment of the present application provides an electric device, including the battery pack 1000 in any of the above embodiments. It is understandable that since the electric device provided by this embodiment has the battery pack 1000 in any of the above embodiments, it has all the beneficial effects of the battery pack 1000, which will not be listed one by one here.

[0138] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0139] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery pack, characterized in that: include: Battery pack (200); A battery box (100), comprising a box body (110), a bottom guard plate (140) and a sealing member (130), wherein the box body (110) has a housing cavity (1121) for accommodating the battery pack (200), a vent hole (1131) communicating with the housing cavity (1121) is provided at the bottom of the box body (110), and the bottom of the box body (110) has a sealing surface (1123), the bottom guard plate (140) is arranged on the sealing surface (1123), and defines an exhaust channel (141) communicating with the exhaust hole (1131) with the box body (110), the exhaust hole (1131) is used to discharge gas released by the battery pack (200) into the exhaust channel (141), and the sealing member (130) is arranged between the bottom guard plate (140) and the sealing surface (1123), and is used to seal the battery pack; The box body (110) has a height direction, and a shielding portion (1124) is provided on the sealing surface (1123), and the shielding portion (1124) is used to shield the sealing member (130). The shielding portion (1124) is provided along the circumference of the sealing member (130), and a side of the shielding portion (1124) facing away from the sealing surface (1123) extends along the height direction of the box body (110), and a distance from a side of the shielding portion (1124) facing away from the sealing surface (1123) to the sealing surface (1123) is greater than a distance from a side of the sealing member (130) facing away from the sealing surface (1123) to the sealing surface (1123).

2. The battery pack according to claim 1, characterized in that: A sealing groove (1125) is provided on the bottom of the box body (110) and / or the bottom guard plate (140), and at least a portion of the sealing element (130) is accommodated in the sealing groove (1125).

3. The battery pack according to claim 2, characterized in that: The sealing groove (1125) is an annular sealing groove, and the sealing member (130) is an annular sealing member adapted to fit the annular sealing groove.

4. The battery pack according to claim 1, characterized in that: The sealing member (130) is made of elastic material, and a gap (131) is formed between the sealing member (130) and the shielding portion (1124).

5. The battery pack according to claim 1, characterized in that: The sealing member (130) is made of a non-elastic material, a first sealing layer is provided between the sealing member (130) and the bottom guard plate (140), and a second sealing layer is provided between the sealing member (130) and the sealing surface (1123); In the height direction of the box body (110), the distance from the side of the sealing member (130) facing away from the sealing surface (1123) to the sealing surface (1123) is A1, and the distance from the side of the shielding portion (1124) facing away from the sealing surface (1123) to the sealing surface (1123) is L, satisfying: L>A1.

6. The battery pack according to claim 1, characterized in that: The bottom guard plate (140) comprises a main body (143) and a contact portion (145) connected to each other, the main body (143) and the box body (110) define the exhaust passage (141), and the contact portion (145) presses against a side of the sealing element (130) facing away from the sealing surface (1123); In the height direction of the box body (110), the distance from the side of the contact portion (145) facing away from the sealing member (130) to the sealing surface (1123) is A2, and the distance from the side of the shielding portion (1124) facing away from the sealing surface (1123) to the sealing surface (1123) is L, satisfying: 1<L / A2<1.

2.

7. The battery pack according to claim 6, characterized in that: The bottom guard plate (140) also includes a transition portion (144), which is connected between the main body portion (143) and the contact portion (145) so that in the height direction of the box body (110), the distance from the side of the main body portion (143) facing the exhaust hole (1131) to the sealing surface (1123) is greater than the distance from the side of the contact portion (145) facing the sealing surface (1123) to the sealing surface (1123).

8. The battery pack according to claim 6, characterized in that: The bottom guard plate (140) further comprises a bending portion (146), wherein the bending portion (146) is connected to a side of the contact portion (145) away from the main body portion (143), and the bending portion (146) is bent in a direction away from the sealing member (130).

9. The battery pack according to any one of claims 1 to 8, characterized in that: The battery box (100) further comprises a fastener (150), wherein the fastener (150) comprises a fixing portion (151) and a pressing portion (152) connected to each other, wherein the fixing portion (151) passes through the bottom guard plate (140) and the sealing member (130) and is connected to the box body (110), and the pressing portion (152) is arranged to press against the bottom guard plate (140).

10. The battery pack according to claim 9, characterized in that: The sealing member (130) is made of elastic material, and the battery box (100) further comprises a limiting member (120); In the height direction of the box body (110), the distance between the two opposite sides of the limiter (120) is D, and the distance between the two opposite sides of the seal (130) in the initial state is H, satisfying: 0.3≤D / H≤0.7, and the limiter (120) is located between the bottom guard plate (140) and the sealing surface (1123) to limit the compression amount of the seal (130).

11. The battery pack according to claim 9, characterized in that: The bottom guard plate (140) includes a first guard plate layer (1401) and a second guard plate layer (1402) which are stacked, the first guard plate layer (1401) being located between the seal (130) and the second guard plate layer (1402), the second guard plate layer (1402) being provided with a groove (14021) passing through the second guard plate layer (1402), the fixing portion (151) being passed through the first guard plate layer (1401) and the seal (130), and being connected to the box body (110), the pressing portion (152) being located at the groove (14021), and pressing against the side of the first guard plate layer (1401) which is away from the seal (130).

12. The battery pack according to any one of claims 1 to 8, characterized in that: The box body (110) comprises a top cover (111), a surrounding plate (112) and an exhaust plate (113); the top cover (111) is detachably connected to one end of the surrounding plate (112) to form the accommodating cavity (1121); the exhaust plate (113) is detachably connected to one end of the surrounding plate (112) away from the top cover (111); the exhaust hole (1131) is provided on the exhaust plate (113); and the exhaust channel (141) is formed between the exhaust plate (113) and the bottom guard plate (140); or The box body (110) is made of metal material by integral molding.

13. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 12.

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