Upper shell of battery pack, battery pack and vehicle

Abstract

The embodiment of the utility model provides an upper shell of a battery pack, the battery pack and a vehicle. The upper shell comprises a shell main body and a shielding body; the shell main body comprises a main body part made of a high polymer material, and the shielding body comprises a shielding structure made of a conductive or magnetic conductive material. And the shielding body is arranged on the outer side of the shell main body, or the shielding body is embedded into the shell main body. The shielding body covers a first area of the shell body, the first area is a projection area of an electric connecting piece in the battery pack on the shell body in the first direction, the electric connecting piece is located on the inner side of the shell body, and the first direction is the direction, relative to the electric connecting piece, of a first sheet metal part of the vehicle. The embodiment of the utility model can be applied to a new energy automobile or an intelligent automobile, and can meet the requirements of light weight of the battery pack and battery shielding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to an upper shell of a battery pack, the battery pack, and a vehicle. BACKGROUND

[0002] As an important part of new energy vehicles such as electric vehicles and hybrid vehicles, the electromagnetic compatibility (EMC) of a battery pack is one of the key performances.

[0003] To achieve lightweight, the upper shell of the battery pack can be made of a high polymer material. However, the upper shell of the battery pack made of the high polymer material cannot shield electromagnetic interference. UTILITARIAN CONTENT

[0004] The present application provides an upper shell of a battery pack, the battery pack, and a vehicle, which can meet the requirements of lightweight and electromagnetic shielding.

[0005] In a first aspect, an upper shell of a battery pack is provided. The upper shell (200) includes a shell body (210) and a shielding body (220); the shell body (210) includes a body part made of a high polymer material, and the shielding body (220) includes a shielding structure made of a conductive or magnetic material. The shielding body (220) is arranged on the outside of the shell body (210), or the shielding body (220) is embedded in the shell body (210). The shielding body (220) covers a first area of the shell body (210), wherein the first area is a projection area of an electrical connector (140) in the battery pack on the shell body (210) along a first direction, the electrical connector (140) is located on the inside of the shell body (210), and the first direction is a direction of a first metal part of a vehicle relative to the electrical connector (140).

[0006] In the present application, for the upper shell, the body part of the shell body made of the high polymer material can reduce the weight of the upper shell, which is conducive to achieving lightweight; by arranging the shielding structure made of the conductive or magnetic material in the upper shell, the electromagnetic waves radiated by the battery pack to the outside can be reduced, and the electromagnetic noise in the cabin can be reduced. In this way, the requirements of lightweight and electromagnetic shielding can be met.

[0007] In some possible implementation manners, the width of the shielding body (220) can be greater than or equal to twice the width of the electrical connector (140).

[0008] In the present application, for the electromagnetic waves radiated by the electrical connector such as a copper bar, when the width of the shielding body is greater than or equal to twice the width of the electrical connector, the shielding body can provide better shielding effect.

[0009] In some possible implementation manners, the distance between the first sheet metal part and the upper shell (200) can be less than or equal to a first threshold, which can be less than or equal to 5 cm.

[0010] In actual scenarios, multiple sheet metal parts can be included in the vehicle, and each sheet metal part can have a different distance from the electrical connector in the battery pack. The closer the sheet metal part is to the upper shell, the more serious the influence of the electromagnetic radiation on the sheet metal part will be. For the sheet metal part far from the upper shell, even if no corresponding electromagnetic shielding structure is arranged, the electromagnetic noise generated by the sheet metal part will be relatively small, and the noise will attenuate in the process of propagating to the cabin and will be within the acceptable range of the user after attenuation, and the user can hardly perceive the electromagnetic noise. For the sheet metal part close to the upper shell, if no corresponding electromagnetic shielding structure is arranged, the sheet metal part will generate relatively large electromagnetic noise due to the serious influence of the electromagnetic radiation, which greatly affects the user's ride experience.

[0011] In this application, for the sheet metal part close to the upper shell, a shielding body can be arranged in the upper shell, and for the sheet metal part far from the upper shell, no corresponding electromagnetic shielding structure needs to be arranged in the upper shell. In this way, the size of the shielding body arranged can be reduced while the light weight and electromagnetic shielding performance are taken into account, and the cost can be reduced.

[0012] In some possible implementation manners, the shielding body (220) can be connected to the electrical ground of the battery pack.

[0013] In this application, when the shielding body is grounded, a better electromagnetic shielding effect can be provided.

[0014] In some possible implementation manners, the electrical ground of the battery pack can include a lower shell (110) of the battery pack, and the shielding body (220) includes a first end and a second end, and the first end and the second end are electrically connected to the lower shell (110).

[0015] In some possible implementation manners, the shielding body (220) can be bonded to the shell body (210).

[0016] In actual scenarios, although the product is tested in the design stage, some problems of electromagnetic noise can be difficult to completely expose in the design stage due to the test samples used. After the product is put on the market, the manufacturer can adjust or upgrade the product according to the market feedback of the user. Compared with the clamping, fastener connection and other ways, the shielding body is arranged in the shell body by using the bonding way, which can avoid the mold repair of the shell body. Especially for the manufacturer, when the shipment is large, to avoid the situation of out-of-stock in the mass production stage, the mold repair often needs to stock a large number of related parts, which will bring a great burden to the inventory management.

[0017] In the embodiments of the present application, the shielding body is bonded to the shell main body. On the one hand, this can avoid the need to modify the shell main body, which is conducive to the manufacturer's inventory management of parts. On the other hand, when the shielding body is fixed to the shell main body using a bonding method, the bonding agent / adhesive can be arranged at any position of the shielding body, and the bonding method can have high flexibility. In addition, the clamping, fastener connection and other methods can only fix the shielding body at specific positions, and when the external vibration conditions are relatively severe, knocking noises are likely to occur between the shielding body and the shell main body. When a bonding method is used, multiple bonding positions can exist between the shielding body and the shell main body, which can reduce the possibility of introducing additional knocking noises.

[0018] In some possible implementation manners, the shielding body (220) can be clamped or fastener-connected with the shell main body (210).

[0019] Since the cost of the double-sided adhesive and other bonding materials is relatively high, in the present application, the clamping structure, bolt hole and other structures for fixing the shielding body are reasonably arranged on the shell main body, which is conducive to reducing the cost of the upper shell.

[0020] In some possible implementation manners, the thickness of the shielding body (220) can be greater than or equal to a second threshold value.

[0021] In the present application, by limiting the lower limit value of the thickness of the shielding body, on the one hand, the strength of the shielding body can be guaranteed, and the shielding body can be prevented from being wrinkled or damaged during installation. On the other hand, the electromagnetic shielding effect of the shielding body can be guaranteed.

[0022] In some possible implementation manners, the second threshold value can be greater than or equal to the skin depth, and the skin depth can satisfy the following condition:

[0023]

[0024] wherein δ represents the skin depth, ρ represents the resistivity of the material used by the shielding structure, f represents the frequency of the current in the shielding structure, μ represents the magnetic permeability of the material used by the shielding structure, and π represents the circular constant.

[0025] In some possible implementation manners, the electrical connecting member (140) can include a copper bar.

[0026] In some possible implementation manners, the main body part of the shell main body (210) can be made of sheet membrane plastic SMC or long glass fiber reinforced polypropylene PP-LGF.

[0027] In a second aspect, a battery pack is provided. The battery pack can include the upper shell in the first aspect and any possible implementation manner thereof.

[0028] In a third aspect, a vehicle is provided, which comprises the upper housing in the first aspect or any possible implementation manner thereof, or comprises the upper housing in the second aspect or any possible implementation manner thereof. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a battery pack 100 provided by an embodiment of the present application.

[0030] Figure 2 is a structural schematic diagram of an upper housing 200 of a battery pack provided by an embodiment of the present application.

[0031] Figure 3 is a schematic diagram of relative positions of a vehicle body sheet metal part and an electrical connecting part 140 provided by an embodiment of the present application.

[0032] Figure 4 is a schematic diagram of a magnetic field distribution of the electrical connecting part 140 provided by an embodiment of the present application.

[0033] Figure 5 is a structural schematic diagram of a shielding body 220 provided by an embodiment of the present application.

[0034] Figure 6 is a schematic diagram of a grounding mode of the shielding body 220 provided by an embodiment of the present application.

[0035] Figures 7 to 9 is a schematic diagram of an improvement effect of the upper housing 200 on electromagnetic noise provided by an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the present application will be described below with reference to the drawings.

[0037] For electric vehicles, hybrid electric vehicles and other new energy vehicles, a battery pack is one of important components thereof.

[0038] Exemplarily, Figure 1 is a structural schematic diagram of a battery pack 100 provided by an embodiment of the present application. As shown in Figure 1 , the battery pack 100 can comprise a lower housing 110, an upper housing 120 and a battery (or referred to as a cell) 130.

[0039] The cell can be integrated in the battery pack in different ways; accordingly, the internal structure of the battery pack can be different under different integration ways. For example, a cell-module-pack (CMP), cell to pack (CTP) and cell to chassis (CTC) mode can be adopted to set the battery in the battery pack.

[0040] The battery pack 100 can further include electrical connectors 140, such as bus bars, copper bars, etc., for realizing electrical connection. The electrical connectors 140 in the battery pack can realize electrical connection between constituent components of the battery pack.

[0041] External electrical equipment, such as a driving motor in a vehicle, etc., can be electrically connected with the battery pack. When the battery pack 100 supplies power to the electrical equipment such as the driving motor, corresponding currents will flow through the electrical connectors such as the copper bars and bus bars in the battery pack; under the action of various factors, these electrical connectors will radiate electromagnetic waves to the periphery.

[0042] In the case where the shell (110, 120) of the battery pack is made of metal materials such as sheet metal and aluminum plate, the shell can have a shielding effect on these electromagnetic waves, and can avoid electromagnetic interference of these electromagnetic waves on other electronic equipment. However, although this method can effectively reduce the radiation of electromagnetic waves, the shell made of metal materials will have a large weight.

[0043] To realize lightweight, the shell of the battery pack can be made of single plastic material or composite plastic material. For example, the upper shell can be made of plastic material to reduce its own weight; the lower shell can still be made of metal materials such as sheet metal and aluminum plate to ensure its strength. However, the shell made of plastic materials and the like will be difficult to shield electromagnetic waves, and the electromagnetic waves generated by the electrical connectors such as copper bars will be radiated to the outside of the battery pack.

[0044] On the one hand, other metal components in the vehicle, such as body panels, etc., can generate electromagnetic noise under the action of electromagnetic waves, and thus cause obvious high-frequency whistling noise in the cabin. Moreover, the electromagnetic noise thus generated is often difficult to be effectively eliminated by acoustic methods, such as adding sound insulation devices such as foam on the sound transmission path, which will greatly affect the user's ride experience and will also cause users to complain about the performance and quality of the vehicle. On the other hand, these electromagnetic waves will cause electromagnetic interference to other electronic equipment.

[0045] In view of this, the embodiments of the present application provide an upper shell of a battery pack, which can meet the requirements of lightweight and electromagnetic shielding.

[0046] Exemplarily, the upper shell 200 can include a shell body 210 and a shielding body 220.

[0047] The shell body 210 can include a main body part made of a polymer material. The main body part of the shell body 210 can be made of a single polymer material, a composite material made of multiple polymer materials, or a composite material made of a polymer material and other materials. For example, the main body part of the shell body 210, or even the entire shell body 210, can be made of a sheet molding compound (SMC), long glass fiber reinforced polypropylene (PP-LGF), or the like. For another example, the upper shell 120 made of a polymer material without electromagnetic shielding function can be taken as an example of the shell body 210.

[0048] The shielding body 220 can include a shielding structure made of an electrically and / or magnetically conductive material. For example, the shielding body 220 can include a thin aluminum plate, an aluminum foil, a thin copper plate, a copper foil, a graphite layer, or the like.

[0049] The relative position relationship between the shell body 210 and the shielding body 220 will be described exemplarily. Figure 2 The relative position relationship between the shell body 210 and the shielding body 220 will be described exemplarily.

[0050] Exemplarily, Figure 2 is a structural schematic diagram of an upper shell 200 of a battery pack provided by an embodiment of the present application.

[0051] In some possible implementation manners, as shown in (a) of Figure 2 , the shielding body 220 can be arranged outside the shell body 210; accordingly, a cross-sectional view of the battery pack at the A-A position in this manner can be as shown in (b) of Figure 2 .

[0052] For example, a fastener such as a clamping joint or a bolt can be used to connect the shielding body 220 and the shell body 210.

[0053] Since the cost of an adhesive material such as double-sided tape is relatively high, in the embodiment of the present application, by reasonably setting a clamping joint structure, a bolt hole structure for fixing the shielding body 220, and the like on the shell body 210, the part cost of the upper shell 200 can be reduced.

[0054] For another example, an adhesive material such as double-sided tape can be used to adhere the shielding body 220 to the shell body 210.

[0055] In actual scenarios, although the product is tested in the design stage, some electromagnetic noise problems may not be fully exposed in the design stage due to the test samples used; after the product is put on the market, the manufacturer may adjust or upgrade the product according to the market feedback of users. Compared with the clamping, fastener connection and the like, the shielding body 220 is arranged on the shell body 210 in the adhesive manner, which can avoid the mold modification of the shell body 210; especially for the manufacturer, when the shipment is large, to avoid the situation of out-of-stock in the mass production stage, the mold modification often needs to stock a large amount of related parts, which will bring a large burden to the inventory management.

[0056] In the embodiment of the present application, the shielding body 220 is adhered to the shell body 210, on the one hand, which can avoid the mold modification of the shell body and is beneficial to the inventory management of the manufacturer; on the other hand, when the shielding body 220 is fixed to the shell body 210 in the adhesive manner, the adhesive / adhesive material can be arranged at any part of the shielding body 220, and the adhesive manner can have higher flexibility. In addition, the clamping, fastener connection and the like can only fix the shielding body 220 at a specific part, and when the external vibration condition is relatively severe, knocking abnormal sound is easily generated between the shielding body 220 and the shell body 210; and when the adhesive manner is used, there can be multiple adhesion parts between the shielding body 220 and the shell body 210, which can reduce the possibility of introducing additional knocking abnormal sound.

[0057] In still another possible implementation manner, the shielding body 220 can be embedded in the shell body 210, and part or all of the shielding body 220 can be covered by the shell body 210. For example, the structure of the upper shell 200 can be as shown in (c) of FIG. 13; accordingly, the cross-sectional view at the position of B-B can be as shown in (d) of FIG. 13. Figure 2 Figure 2 For another example, after the shielding body 220 is manufactured, it can be placed in the mold of the shell body 210; the shielding body 220 can be integrated with the shell body in the form of an embedded part through a process such as injection molding.

[0058] Compared with the scheme of embedding the shielding body 220 in the shell body 210, when the shielding body 220 is arranged on the outside of the shell body 210, the thickness of the shell body 210 can be thinner. In addition, in the design stage, it can be necessary to adjust the shape and / or arrangement position of the electric connection member 140 such as the copper bar in the battery pack; accordingly, to ensure the electromagnetic shielding effect, the shape and / or arrangement position of the shielding body 220 need to be adjusted accordingly; if the shielding body 220 is embedded in the shell body 210, the shell body 210 can need to be modified; and when the shielding body 220 is arranged on the outside of the shell body 210, the structure of the shell body 210 can not need to be adjusted, thereby reducing the engineering quantity and cost of mold modification. ​

[0059] Exemplarily, the shielding body 220 can cover at least a first region of the housing body 210. The first region can include a projection region of the electrical connector 140 on the housing body 210 along a first direction, which can be a direction of the first sheet metal part of the vehicle relative to the electrical connector 140. Covering the first region of the housing body 210 by the shielding body 220 can be understood as that a shielding structure in the shielding body 220 can cover the first region. For example, the electrical connector 140 can be a copper bar, bus bar, etc. in the battery pack. For another example, the first sheet metal part can be a frame, a cabin floor, etc.

[0060] For the shielding structure made of the conductive material, under the action of the external electromagnetic field, the shielding structure can generate eddy current, which can offset the influence of the electromagnetic wave radiated by the electrical connector 140 on the first sheet metal part. For the shielding structure made of the magnetic conductive material, the shielding structure can change the direction of the external magnetic field, in this way, the influence of the electromagnetic wave radiated by the electrical connector 140 on the first sheet metal part can be reduced.

[0061] In the embodiments of the present application, the main body part of the housing body 210 is made of the high polymer material, which can reduce the weight of the upper housing 200 as a whole, and is conducive to realizing the light weight; by arranging the shielding structure made of the conductive or magnetic conductive material in the upper housing 200, the electromagnetic wave radiated by the battery pack to the outside can be reduced, and the electromagnetic noise in the cabin can be reduced. In this way, the requirements of light weight and electromagnetic shielding can be met. In addition, according to the projection region of the electrical connector 140 in the battery pack on the housing body, the corresponding shielding structure can be arranged, which can realize the required electromagnetic shielding effect with a smaller size of the shielding structure, thereby reducing the cost.

[0062] In some possible implementation manners, the distance between the first sheet metal part and the upper housing 200 can be less than or equal to a certain threshold value (for ease of distinction, the first threshold value). For example, the threshold value can be 3 cm, 5 cm. For another example, the first sheet metal part can be determined from the sheet metal parts around the upper housing 200 according to the installation position of the battery pack in the vehicle and the actual structure of the vehicle, in combination with the distance between each sheet metal part and the upper housing 200.

[0063] In actual scenarios, multiple sheet metal pieces can be included in the vehicle, and each sheet metal piece can have a different distance from the electrical connector 140 in the battery pack. The closer the sheet metal piece to the battery pack, the more serious the influence of the electromagnetic radiation on the sheet metal piece. For the sheet metal piece far from the battery pack, even if no corresponding electromagnetic shielding structure is arranged, the electromagnetic noise generated by the sheet metal piece is relatively small. Moreover, in the process of propagating to the cabin, the noise is attenuated and can be within the acceptable range of the user after attenuation, and the user can hardly perceive the electromagnetic noise. For the sheet metal piece close to the battery pack, if no corresponding electromagnetic shielding structure is arranged, the sheet metal piece will generate relatively large electromagnetic noise due to the serious influence of the electromagnetic radiation, which greatly affects the user's ride experience.

[0064] In the embodiments of the present application, for the sheet metal piece close to the battery pack, the shielding body 220 can be arranged in the upper shell 200, and for the sheet metal piece far from the battery pack, no corresponding electromagnetic shielding structure needs to be arranged. In this way, the size of the shielding body 220 arranged can be reduced while the light weight and electromagnetic shielding performance are taken into account, and the cost can be reduced.

[0065] Suppose the shape of the electrical connector 140 is a long strip as shown in Figure 1 , the structure of the upper shell 200 is as shown in Figure 2 (a). The first direction and the first region are exemplarily described below in Figure 3 .

[0066] Exemplarily, Figure 3 is a schematic diagram of the relative position relationship between the vehicle body sheet metal piece and the electrical connector 140 provided by the embodiments of the present application.

[0067] In one embodiment, referring to (a) in Figure 3 , the sheet metal piece #1 can be directly above the electrical connector 140, and the upper shell 200 can isolate the two. The direction 1 can represent the direction of the sheet metal piece #1 relative to the electrical connector 140, and the shielding body 220 can cover at least the projection region of the electrical connector 140 on the shell body 210 along the direction 1; the width of the projection region can be equal to the width of the electrical connector 140. In this example, the sheet metal piece #1 can correspond to the first sheet metal piece described above, and the direction 1 can correspond to the first direction.

[0068] In another embodiment, referring to (b) in Figure 3 , the sheet metal piece #2 can be above the side of the electrical connector 140, and the relative position relationship between the two can be represented by the direction 2. The shielding body 220 can cover at least the projection region of the electrical connector 140 on the shell body 210 along the direction 2. In this example, the sheet metal piece #2 can correspond to the first sheet metal piece described above, and the direction 2 can correspond to the first direction.

[0069] In some possible implementation manners, in order to achieve a better shielding effect, the width of the shielding body 220 can be greater than the width of the first region; and the length of the shielding body 220 can be greater than the length of the first region. For example, the width of the shielding body 220 can be greater than the width of the first region by a certain margin. For another example, the width of the shielding body 220 can be twice or more than the width of the first region.

[0070] Suppose that the shape of the electric connector 140 is a strip shape as shown in FIG. 14A, and the structure of the upper shell 200 is as shown in FIG. 14B(a). The following exemplary description is made in combination with the distribution of magnetic induction lines in the magnetic field generated by the electric connector 140. Figure 1 Figure 2 Suppose that the shape of the electric connector 140 is a strip shape as shown in FIG. 14A, and the structure of the upper shell 200 is as shown in FIG. 14B(a). The following exemplary description is made in combination with the distribution of magnetic induction lines in the magnetic field generated by the electric connector 140. Figure 4

[0071] Exemplarily, FIG. 14C is a schematic diagram of the magnetic field distribution of the electric connector 140. Figure 4

[0072] Suppose that the relative positional relationship between the electric connector 140 and the upper shell 200 is as shown in FIG. 14B(a) and (b). When a corresponding current flows through the electric connector 140, the electric connector 140 can generate a corresponding magnetic field; and the distribution of magnetic induction lines in the magnetic field at position A-A can be as shown in FIG. 14C(a) and (b). Figure 3 Figure 4 Compared with FIG. 14C(a), in FIG. 14C(a), the shielding body 220 has a greater width, and can have a better shielding effect on the electromagnetic wave radiated by the electric connector 140. Figure 3 Figure 4 Similarly, compared with FIG. 14C(b), in FIG. 14C(b), the shielding body 220 has a greater width, and can have a better shielding effect on the electromagnetic wave radiated by the electric connector 140.

[0073] In a specific implementation, the width of the shielding body 220 can be set according to a required shielding effect. Suppose that the relative positional relationship between the electric connector 140 and the upper shell 200 is as shown in FIG. 14B(a) and (b). Figure 3 Figure 4

[0074] In a specific implementation, the width of the shielding body 220 can be set according to a required shielding effect. Suppose that the relative positional relationship between the electric connector 140 and the upper shell 200 is as shown in FIG. 14B(a) and (b). Figure 4 ​​​​​​​As shown in (a) above. For example, if the width of the shield 220 is twice the width of the electrical connector 140, and the electromagnetic noise generated by the sheet metal part is within the user's acceptable range, the width of the shield 220 can be set to twice the width of the electrical connector 140; if the electromagnetic noise generated by the sheet metal part still has a significant impact on the user, the width of the shield 220 can be further increased to improve the electromagnetic shielding effect, so that the electromagnetic noise is ultimately within the user's acceptable range.

[0075] It is understandable that the above Figures 1 to 4 The shape of the electrical connector 140 described herein is merely an example; the electrical connector 140 can also be other shapes (such as U-shaped, zigzag, or other regular or irregular shapes). Correspondingly, the shape of the shielding body 220 can be set according to the shape of the electrical connector 140 and the required shielding effect. The following is in conjunction with... Figure 5 This is an example illustration.

[0076] For example, Figure 5 This is a schematic diagram of the structure of the shield 220 provided in the embodiments of this application.

[0077] exist Figure 5 In this context, we assume the positional relationship between the electrical connector 140 and the upper housing 200 is as follows: Figure 4 As shown in (a); correspondingly, projection area #1 can be understood as the projection area of ​​electrical connector 140 on housing body 210 in the vertical direction, and this projection area #1 can correspond to the aforementioned first area. Unlike Figure 3 and Figure 4 , Figure 5 The relative positional relationship between the shield 220 and the first region is shown from a top-down perspective; the shape of the projected region #1 can reflect the shape of the electrical connector 140.

[0078] In one embodiment, such as Figure 5 As shown in (a) and (b), the electrical connector 140 can be U-shaped; correspondingly, the projection area of ​​the electrical connector 140 on the housing body 210 (i.e., projection area #1) can also be U-shaped. For example, if the shielding body 220 can achieve the required shielding effect with a small width, the shielding body 220 can also be U-shaped, with a certain amount of free space between its left and right halves, such as... Figure 5 As shown in (a) above. For example, if the shielding body 220 has a small width and it is difficult to achieve the required shielding effect, a larger shielding body 220 can be provided, and the shape of the shielding body 220 can be as follows: Figure 5 As shown in (b) of the diagram.

[0079] In yet another embodiment, such as Figure 5As shown in (c) and (d) in the diagram, the electrical connector 140 can be in a zigzag shape. Similarly, the shape and arrangement of the shield 220 can be set according to the desired shielding effect; for example, the shape of the shield 220 can be as follows: Figure 5 As shown in (c) and (d) in the figure.

[0080] In some possible implementations, to achieve better shielding, the shield 220 can be grounded. For example, one end of the shield 220 can be grounded. When only one end of the shield 220 is grounded, its floating end may have a certain potential under the influence of an external electromagnetic field. Alternatively, both ends of the shield 220 can be grounded separately.

[0081] For example, the lower housing 110 of the battery pack may be an aluminum housing, which may serve as the electrical "ground" of the battery pack.

[0082] For example, such as Figure 6 As shown in (a), when the upper housing 200 is positioned above the lower housing 110, one end of the shield 220 can be in contact / electrically connected to the aluminum lower housing 110; the other end of the shield 220 can be suspended. Alternatively, both ends of the shield 220 can be electrically connected to the aluminum lower housing 110, allowing the shield 220 to form a circuit with electrical "ground". Alternatively, the ends of the shield 220 can be fixed to the aluminum lower housing 110 by snap-fitting, fastener connection, or other methods. Alternatively, as... Figure 6 As shown in (b), the shield 220 can be bent along the fold line; the middle part of the shield 220 can be bonded to the housing body 210 using double-sided adhesive 231; and conductive adhesive layers 232 and 233 can be used to bond the two ends of the shield 220 to the aluminum lower housing 110, respectively.

[0083] In some possible implementations, the thickness of the shield 220 may be greater than or equal to a certain threshold (which may be referred to as the second threshold for easy distinction). The second threshold may be a fixed value, or it may be a value related to the material used for the shield 220.

[0084] In some embodiments, the second threshold can be a fixed value, such as 0.3 millimeters (mm) or 0.5 millimeters.

[0085] In actual production, when the shield 220 is installed on the outside of the housing body 210 by means of snap-fit ​​or fastener connection, if the shield 220 is too thin, it is easy for wrinkles or even damage to occur during installation. In this embodiment, by limiting the lower limit of the thickness of the shield 220, the strength of the shield 220 is guaranteed.

[0086] In yet other embodiments, the second threshold can be related to the material used for the shield 220. For example, the second threshold can be related to the skin depth of the material.

[0087] For any conductor, when high frequency current passes through the conductor, the current will mainly concentrate on the surface of the conductor; the skin depth can represent the depth at which the current density reduces to 1 / e (e is a natural constant, approximately equal to 2.71) of the surface current density of the conductor. The skin depth can satisfy the following condition:

[0088]

[0089] wherein δ can represent the skin depth, p can represent the resistivity of the material, f can represent the frequency of the current passing through the conductor, and μ can represent the magnetic permeability of the material. μ can be equal to the product of the relative magnetic permeability (denoted as μ r ) of the material and the magnetic permeability of vacuum (denoted as μ0), i.e., μ = μ0*μ r , μ0 = 4π x 10 -7 henry per meter (H / m).

[0090] Assuming the frequency of the current is 9 kilo- (k) hertz (Hz); the skin depths of the conductors of different materials can be as shown in Table 1 when the frequency of the current is 9 kHz.

[0091] Table 1 Skin depths of conductors of different materials

[0092] Material Relative magnetic permeability μ r ]]> Resistivity Ω / m Skin depth Aluminium 1 2.65 x 10 -8 ]] 0.86 mm Copper 1 1.68 x 10 -8 ]]> 0.69 mm Nickel 600 6.84 x 10 -8 ]]> 0.057 mm

[0093] Exemplarily, the second threshold can be determined according to the skin depth. For example, the threshold can be 30% or 50% of the skin depth, or can be greater than or equal to the skin depth; the threshold can be set according to the required shielding effect.

[0094] For example, the shield 220 is affected by the interfering magnetic flux and generates a shielding circulating current. Assuming the frequency of the circulating current is less than or equal to 9 kHz, for the shield 220 made of aluminum, a thickness greater than or equal to the skin depth 0.86 mm can achieve a better shielding effect. In this example, the second threshold can be equal to the skin depth. For another example, the second threshold can also be set with a certain margin (such as 0.05 mm or 0.1 mm) based on the skin depth.

[0095] The structure of the upper shell 200 is exemplarily described above. Figures 2 to 6 The electromagnetic shielding effect of the upper shell 200 is exemplarily described below. Figures 7 to 9 The electromagnetic shielding effect of the upper shell 200 is exemplarily described below. Figures 7 to 9This can be understood as a schematic diagram of the results of two test scenarios (denoted as Test Scenario A and Test Scenario B, respectively). In both Test Scenario A and Test Scenario B, the drive motor is powered by the battery pack, and electromagnetic noise in the vehicle cabin is measured. The difference between Test Scenario A and Test Scenario B is that in Test Scenario A, the battery pack uses a plastic upper housing 120 without electromagnetic shielding; while in Test Scenario B, the battery pack uses an upper housing 200 with a shield 220. In other words, apart from the upper housing used for the battery pack, all other conditions are the same in Test Scenario A and Test Scenario B; for example, the same vehicle is used for testing in both scenarios.

[0096] Figure 7 and Figure 8 Color cloud maps of electromagnetic noise inside the vehicle are shown for two test scenarios (denoted as test scenario A and B).

[0097] Figure 7 Images (a) and (b) show color contour plots of electromagnetic noise in the front and rear seats of the cockpit, respectively, in test scenario A. Similarly, Figure 8 (a) and (b) in the figure show color cloud maps of electromagnetic noise in the front and rear seats of the cockpit in test scenario B, respectively.

[0098] Reference Figure 7 In (a) and (b) of the diagram, when the drive motor speed is between 1000 and 9000 revolutions per minute (rpm), the maximum electromagnetic noise in the cockpit can reach 30 decibels (dB). (See reference...) Figure 8 In (a) and (b), when the upper shell 200 with a shield 220 is used, the electromagnetic noise in the cockpit will be greatly reduced, and the electromagnetic noise in the cockpit will be much less than 30dB.

[0099] Figure 9 The effects of shielding materials made of different materials on improving electromagnetic noise inside a vehicle are shown. For example... Figure 9 As shown, by setting a shielding structure made of aluminum foil or copper foil in the upper housing 200, electromagnetic noise in the cockpit can be effectively reduced.

[0100] The above combination Figures 2 to 9 The upper housing 200 provided in the embodiments of this application is described.

[0101] This application also provides a battery pack, which may include an upper housing 200 and any possible implementation thereof.

[0102] The vehicle can also include the upper shell 200 and any possible implementation manner, or can include the battery pack described above.

[0103] The vehicle involved in the embodiments of the present application is a vehicle in a broad sense, which can be a vehicle (such as a commercial vehicle, a passenger vehicle, a motorcycle, a flying vehicle, a train, etc.), an industrial vehicle (such as a forklift, a trailer, a tractor, etc.), an engineering vehicle (such as an excavator, a bulldozer, a crane, etc.), an agricultural device (such as a mower, a harvester, etc.), a recreational device, a toy vehicle, etc. The embodiments of the present application do not specifically limit the type of vehicle. For example, the vehicle in the present application can include a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle (NEV), etc.

[0104] The detailed description and the drawings of the above embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0105] Unless otherwise required by the context, throughout the specification and claims, the term "comprise" and other forms such as "comprises" and "comprising", are to be construed as open, inclusive, meaning "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to mean that the particular feature, structure, material or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present application. The illustrative representation of the above terms does not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials or characteristics can be included in any one or more embodiments or examples in any appropriate manner.

[0106] The terms "first", "second", etc. are used only for the purpose of description and are not to be interpreted in a relative manner unless otherwise indicated or implied. Thus, features defined with "first", "second" can include one or more of the features explicitly or implicitly. In the description of the embodiments of the present application, it should be understood that the meaning of "a plurality" is at least two or more, unless otherwise indicated or implied.

[0107] The orientation words appearing in the description of the embodiments of the present application are the directions shown in the drawings, and are not intended to limit the specific structure in the embodiments of the present application. In the description of the embodiments of the present application, it should be understood that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0108] In the embodiments of the present application, the term "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0109] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after it.

[0110] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0111] In addition, the use of "based on" means openness and inclusiveness, because the process, step, calculation or other action "based on" one or more of the conditions or values described can be based on additional conditions or beyond the values described in practice.

[0112] As used herein, the terms "about," "substantially," or "approximately" in reference to a particular measurement or value are understood to refer to a value that is within an acceptable range of deviation for that particular measurement or value, as would be understood by one of ordinary skill in the art in the field of the disclosure when considered in light of the description of the measurement or value, and the error associated with the measurement or value, i.e., the limitations of the measurement system.

[0113] In several embodiments provided in the present application, it should be understood that the above-described embodiments are only illustrative, for example, the division of the modules is only a logical functional division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0114] The above describes only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An upper case (200) of a battery pack, characterized in that, the upper case (200) comprises a case body (210) and a shielding body (220), the case body (210) comprises a body part made of a high-molecular material, and the shielding body (220) comprises a shielding structure made of an electrically-conductive or magnetically-conductive material; the shielding body (220) is arranged outside the case body (210), or the shielding body (220) is embedded in the case body (210); the shielding body (220) covers a first area of the case body (210), the first area is a projection area of an electrical connector (140) in the battery pack on the case body (210) along a first direction, the electrical connector (140) is located inside the case body (210), and the first direction is a direction of a first sheet metal part of a vehicle relative to the electrical connector (140).

2. The upper case (200) according to claim 1, characterized in that, a width of the shielding body (220) is greater than or equal to twice a width of the electrical connector (140).

3. The upper case (200) according to claim 1 or 2, characterized in that, a distance between the first sheet metal part and the upper case (200) is less than or equal to a first threshold value, and the first threshold value is less than or equal to 5 cm.

4. The upper case (200) according to claim 1 or 2, characterized in that, the shielding body (220) is connected to an electrical ground of the battery pack.

5. The upper case (200) according to claim 4, characterized in that, the electrical ground of the battery pack comprises a lower case (110) of the battery pack, and the shielding body (220) comprises a first end and a second end, and the first end and the second end are electrically connected to the lower case (110).

6. The upper case (200) according to claim 1 or 2, characterized in that, the shielding body (220) is bonded to the case body (210).

7. The upper case (200) according to claim 1 or 2, characterized in that, the shielding body (220) is clamped or fastened to the case body (210).

8. The upper case (200) according to claim 1 or 2, characterized in that, a thickness of the shielding body (220) is greater than or equal to a second threshold value.

9. The upper case (200) according to claim 8, characterized in that, the second threshold value is greater than or equal to a skin depth, and the skin depth satisfies the following condition: wherein, the δ represents the skin depth, the ρ represents an electrical resistivity of a material adopted by the shielding structure, the f represents a frequency of an electric current in the shielding structure, the μ represents a magnetic permeability of the material adopted by the shielding structure, and the π represents a circular constant.

10. The upper case (200) according to claim 1 or 2, characterized in that, the electrical connector (140) comprises a copper bar.

11. The upper case (200) according to claim 1 or 2, characterized in that, The main body part is made of sheet molding compound (SMC) or long glass fiber reinforced polypropylene (PP-LGF).

12. A battery pack, characterized by, The upper housing (200) as claimed in any one of claims 1 to 11.

13. A vehicle characterized by comprising: The battery pack as claimed in claim 12, or the upper housing (200) as claimed in any one of claims 1 to 11.

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