Upper housing of battery pack, battery pack, and vehicle

Abstract

The present application provides an upper housing of a battery pack, a battery pack, and a vehicle. The upper housing comprises a housing body and a shielding body; the housing body comprises a main body portion made of a polymer material, and the shielding body comprises a shielding structure made of an electrically conductive or magnetically conductive material. The shielding body is disposed on the outer side of the housing body, or the shielding body is embedded in the housing body. The shielding body covers a first area of the housing body, wherein the first area is a projection area of an electrical connector in the battery pack on the housing body in a first direction, the electrical connector is located on the inner side of the housing body, and the first direction is the direction of a first sheet metal part of the vehicle relative to the electrical connector. The present application can be applied to new energy vehicles or intelligent vehicles, and can take into account the requirements of lightweight of a battery pack and battery shielding.

Description

Upper shell of battery pack, battery pack and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202422417752.X, filed on September 30, 2024, and entitled "Upper shell of battery pack, battery pack and vehicle", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, more particularly, to an upper shell of battery pack, a battery pack and a vehicle. BACKGROUND

[0003] As an important part of new energy vehicles such as electric vehicles and hybrid vehicles, the electromagnetic compatibility (EMC) of the battery pack is one of the key performances.

[0004] In order to achieve lightweight, the upper shell of the battery pack can be made of a high molecular material. However, the upper shell of the battery pack made of a high molecular material cannot shield electromagnetic interference.

[0005] SUMMARY

[0006] The present application provides an upper shell of battery pack, a battery pack and a vehicle, which can meet the requirements of lightweight and electromagnetic shielding.

[0007] In a first aspect, an upper shell of 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 molecular 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 the vehicle relative to the electrical connector (140).

[0008] In the present application, for the upper shell, the body part of the shell body is made of a high molecular material, which can reduce the weight of the upper shell and is beneficial to achieve lightweight; by arranging the shielding structure made of a conductive or magnetic material in the upper shell, the electromagnetic waves radiated from 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.

[0009] 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).

[0010] In the present application, for the electromagnetic wave radiated by the electrical connector such as the 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.

[0011] In some possible implementation manners, the distance between the first sheet metal member and the upper shell (200) can be less than or equal to a first threshold value, which can be less than or equal to 5 cm.

[0012] In actual scenarios, multiple sheet metal members can be included in the vehicle, and the distances between the sheet metal members and the electrical connector in the battery pack can be different. The closer the sheet metal member to the upper shell, the more serious the influence of the electromagnetic radiation on the sheet metal member. For the sheet metal member far away from the upper shell, even if no corresponding electromagnetic shielding structure is arranged, the electromagnetic noise generated by the sheet metal member is relatively small, and the noise can be attenuated in the process of propagating to the cabin and can be within the acceptable range of the user or even difficult to be perceived by the user. For the sheet metal member close to the upper shell, if no corresponding electromagnetic shielding structure is arranged, the electromagnetic radiation has a relatively serious influence on the sheet metal member, and the sheet metal member will generate relatively large electromagnetic noise, which greatly affects the user's ride experience.

[0013] In the present application, for the sheet metal member close to the upper shell, the shielding body can be arranged in the upper shell, and for the sheet metal member far away 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.

[0014] In some possible implementation manners, the shielding body (220) can be connected to the electrical ground of the battery pack.

[0015] In the present application, when the shielding body is grounded, better electromagnetic shielding effect can be provided.

[0016] 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).

[0017] In some possible implementation manners, the shielding body (220) can be bonded to the shell body (210).

[0018] In actual scenarios, although the product is tested in the design stage, some electromagnetic noise problems may be difficult to fully expose in the design stage due to the test samples adopted; 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 is arranged on the shell main body in the adhesive manner, which can avoid the mold repair of the shell main 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 causes a large amount of spare parts to be reserved, which will bring a large burden to the inventory management.

[0019] In the embodiments of the present application, the shielding body is adhered to the shell main body, on the one hand, the mold repair of the shell main body can be avoided, which is beneficial to the inventory management of the manufacturer; on the other hand, when the shielding body is fixed to the shell main body in the adhesive manner, the adhesive / adhesive material can be arranged at any position of the shielding body, and the adhesive manner can have high flexibility. In addition, the clamping, fastener connection and the like can only fix the shielding body at a specific position, and when the external vibration condition is relatively severe, knocking abnormal sound is easily generated between the shielding body and the shell main body; and when the adhesive manner is adopted, multiple adhesion positions can exist between the shielding body and the shell main body, which can reduce the possibility of introducing additional knocking abnormal sound.

[0020] In some possible implementation manners, the shielding body (220) can be clamped or fastener connected with the shell main body (210).

[0021] Since the cost of the adhesive material such as double-sided tape is relatively high, in the present application, the clamping structure, bolt hole and the like for fixing the shielding body are reasonably arranged on the shell main body, which is beneficial to reducing the cost of the upper shell.

[0022] In some possible implementation manners, the thickness of the shielding body (220) can be greater than or equal to the second threshold value.

[0023] 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 creasing, damage and the like of the shielding body in the installation process can be avoided; on the other hand, the electromagnetic shielding effect of the shielding body can be guaranteed.

[0024] 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:

[0025] Wherein, δ represents the skin depth, ρ represents the resistivity of the material adopted by the shielding structure, f represents the frequency of the current in the shielding structure, μ represents the magnetic permeability of the material adopted by the shielding structure, and π represents the circular constant.

[0026] In some possible implementation manners, the electrical connector (140) can include a copper bar.

[0027] In some possible implementation manners, the main body part of the shell body (210) can be made of sheet membrane plastic SMC, long glass fiber reinforced polypropylene PP-LGF.

[0028] 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.

[0029] In a third aspect, a vehicle is provided. The vehicle can include the upper shell in the first aspect and any possible implementation manner thereof, or the upper shell in the second aspect and any possible implementation manner thereof. BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a structural schematic diagram of a battery pack 100 provided by an embodiment of the present application;

[0031] FIG. 2 is a structural schematic diagram of an upper shell 200 of the battery pack provided by an embodiment of the present application;

[0032] FIG. 3 is a schematic diagram of the relative position relationship between a vehicle body sheet metal part and an electrical connector 140 provided by an embodiment of the present application;

[0033] FIG. 4 is a schematic diagram of the magnetic field distribution of the electrical connector 140 provided by an embodiment of the present application;

[0034] FIG. 5 is a structural schematic diagram of a shielding body 220 provided by an embodiment of the present application;

[0035] FIG. 6 is a schematic diagram of a grounding mode of the shielding body 220 provided by an embodiment of the present application;

[0036] FIGS. 7 to 9 are schematic diagrams of the improvement effect of the upper shell 200 on electromagnetic noise provided by an embodiment of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the present application will be described below with reference to the drawings.

[0038] For electric vehicles, hybrid electric vehicles, and other new energy vehicles, a battery pack is one of the important components thereof.

[0039] Exemplarily, FIG. 1 is a structural schematic diagram of a battery pack 100 provided by an embodiment of the present application. As shown in FIG. 1, the battery pack 100 can include a lower shell 110, an upper shell 120, and a battery (or referred to as an electric core) 130.

[0040] The battery cell can be integrated into the battery pack in different ways; accordingly, the internal structure of the battery pack can be different under different integration ways. For example, the battery can be arranged in the battery pack in a cell-module-pack (CMP), cell-to-pack (CTP), cell-to-chassis (CTC) or the like way.

[0041] The battery pack 100 can also include electrical connectors 140, such as busbars, copper bars or the like, for realizing electrical connection. The electrical connectors 140 in the battery pack can realize electrical connection between the constituent parts of the battery pack.

[0042] External electrical equipment (such as a drive motor in a vehicle or the like) can be electrically connected with the battery pack. When the battery pack 100 supplies power to the electrical equipment such as a drive motor, corresponding current will flow through the electrical connectors such as copper bars and busbars in the battery pack; under the action of various factors, these electrical connectors will radiate electromagnetic waves to the surrounding.

[0043] 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 way can effectively reduce the radiation of electromagnetic waves, the shell made of metal materials will have a large weight.

[0044] 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 or the like material 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.

[0045] On the one hand, other metal parts (such as body panels or the like) in the vehicle 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 means (such as adding a sound insulation device 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.

[0046] 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.

[0047] Exemplarily, the upper shell 200 can include a shell body 210 and a shielding body 220.

[0048] 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.

[0049] 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.

[0050] The relative position relationship between the shell body 210 and the shielding body 220 will be exemplarily described below in combination with FIG. 2.

[0051] Exemplarily, FIG. 2 is a structural schematic diagram of the upper shell 200 of the battery pack provided in the embodiments of the present application.

[0052] In some possible implementation manners, as shown in (a) of FIG. 2, the shielding body 220 can be arranged outside the shell body 210. Correspondingly, the cross-sectional view of the battery pack at the position A-A in this manner can be as shown in (b) of FIG. 2.

[0053] For example, the shielding body 220 and the shell body 210 can be connected by using fasteners such as clamps and bolts.

[0054] Since the cost of adhesive materials such as double-sided tape is relatively high, in the embodiments of the present application, by reasonably setting the clamping structure, bolt holes, and other structures for fixing the shielding body 220 on the shell body 210, the part cost of the upper shell 200 can be reduced.

[0055] For another example, the shielding body 220 can be adhered to the shell body 210 by using adhesive materials such as double-sided tape.

[0056] 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 repair 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 repair often needs to stock a large number of related parts, which will bring a great burden to the inventory management.

[0057] In the embodiments of the present application, the shielding body 220 is adhered to the shell body 210. On the one hand, the mold repair of the shell body can be avoided, which 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 high 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 noise is likely to occur between the shielding body 220 and the shell body 210. By using the adhesive manner, multiple adhesion parts can exist between the shielding body 220 and the shell body 210, which can reduce the possibility of introducing additional knocking noise.

[0058] 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. 2; accordingly, the cross-sectional view at the B-B position can be as shown in (d) of FIG. 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.

[0059] 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 repaired; 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 repair.

[0060] 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 or the like in the battery pack. For another example, the first sheet metal part can be a frame, a cabin floor or the like.

[0061] 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.

[0062] 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 shielding structure, thereby reducing the cost.

[0063] 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.

[0064] 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 thereon. 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, and in the process of propagating to the cabin, the noise is attenuated and can be within the acceptable range of the user, 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.

[0065] 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.

[0066] It is assumed that the shape of the electrical connector 140 is a strip shape as shown in FIG. 1, and the structure of the upper shell 200 is shown in (a) of FIG. 2. The first direction and the first region are exemplarily described below in combination with FIG. 3.

[0067] Exemplarily, FIG. 3 is a schematic diagram of the relative position relationship between the sheet metal piece of the vehicle body and the electrical connector 140 according to an embodiment of the present application.

[0068] In one embodiment, referring to (a) of FIG. 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.

[0069] In another embodiment, referring to (b) of FIG. 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.

[0070] 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 area; the length of the shielding body 220 can be greater than the length of the first area. For example, the width of the shielding body 220 can be greater than the width of the first area 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 area.

[0071] Suppose that the shape of the electrical connector 140 is a strip shape as shown in FIG. 1, and the structure of the upper shell 200 is as shown in (a) of FIG. 2. The radiation of electromagnetic waves is exemplarily described below by taking the distribution of magnetic induction lines in the magnetic field generated by the electrical connector 140 as an example.

[0072] Exemplarily, FIG. 4 is a schematic diagram of the magnetic field distribution of the electrical connector 140.

[0073] Suppose that the relative positional relationship between the electrical connector 140 and the upper shell 200 is as shown in (a) and (b) of FIG. 3. When a corresponding current flows, the electrical 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 (a) and (b) of FIG. 4. Compared with (a) of FIG. 3, in (a) of FIG. 4, the shielding body 220 can have a greater width; and the shielding body 220 with the greater width can have a better shielding effect on the electromagnetic waves radiated by the electrical connector 140.

[0074] Similarly, compared with (b) of FIG. 3, in (b) of FIG. 4, the shielding body 220 has a greater width and can have a better shielding effect on the electromagnetic waves radiated by the electrical connector 140.

[0075] 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 electrical connector 140 and the upper shell 200 is as shown in (a) of FIG. 4. For example, in a case where the width of the shielding body 220 is twice the width of the electrical connector 140, if the electromagnetic noise generated by the sheet metal part is within the acceptable range of a user, the width of the shielding body 220 can be set to be twice the width of the electrical connector 140; and if the electromagnetic noise generated by the sheet metal part still has a great impact on the user, the width of the shielding body 220 can be further increased to improve the electromagnetic shielding effect, so that the electromagnetic noise can finally be within the acceptable range of the user.

[0076] It can be understood that the shape of the electrical connector 140 described in FIGS. 1 to 4 is only an example, and the electrical connector 140 can also be other shapes (such as U-shaped, polyline-shaped, and other regular or irregular shapes); accordingly, the shape of the shielding body 220 can be set according to the shape of the electrical connector 140 and the shielding effect required. The following is exemplarily described in combination with FIG. 5.

[0077] Exemplarily, FIG. 5 is a structural schematic diagram of the shielding body 220 provided by the embodiment of the application.

[0078] In FIG. 5, it is assumed that the positional relationship between the electrical connector 140 and the upper shell 200 is as shown in (a) of FIG. 4; accordingly, the projection area #1 can be understood as the projection area of the electrical connector 140 on the shell body 210 in the vertical direction, which can correspond to the first area described above. Unlike FIGS. 3 and 4, FIG. 5 introduces the relative positional relationship between the shielding body 220 and the first area from a top view; the shape of the projection area #1 can reflect the shape of the electrical connector 140.

[0079] In one embodiment, as shown in (a) and (b) of FIG. 5, the electrical connector 140 can be U-shaped; accordingly, the projection area (i.e., the projection area #1) of the electrical connector 140 on the shell body 210 can also be U-shaped. For example, in the case where the shielding body 220 has a small width and can achieve the required shielding effect, the shielding body 220 can also be U-shaped, and there can be a certain free area between the left half and the right half of the shielding body 220, as shown in (a) of FIG. 5. For another example, in the case where the shielding body 220 has a small width and is difficult to achieve the required shielding effect, a shielding body 220 of a larger size can be provided, and the shape of the shielding body 220 can be as shown in (b) of FIG. 5.

[0080] In another embodiment, as shown in (c) and (d) of FIG. 5, the electrical connector 140 can be polyline-shaped. Similarly, the shape and arrangement position of the shielding body 220 can be set according to the shielding effect required, such as the shape of the shielding body 220 can be as shown in (c) and (d) of FIG. 5.

[0081] In some possible implementations, in order to achieve a better shielding effect, the shielding body 220 can be grounded. For example, one end of the shielding body 220 can be grounded. When only one end of the shielding body 220 is grounded, the free end of the shielding body 220 can have a certain potential under the influence of an external electromagnetic field. For another example, both ends of the shielding body 220 can be grounded.

[0082] Exemplarily, the lower shell 110 of the battery pack can be an aluminum shell, and the lower shell 110 can serve as the electrical “ground” of the battery pack.

[0083] For example, as shown in (a) of FIG. 6, when the upper shell 200 is arranged above the lower shell 110, one end of the shielding body 220 can be in contact / electrically connected with the aluminum lower shell 110; the other end of the shielding body 220 can be suspended. For another example, both ends of the shielding body 220 can be electrically connected with the aluminum lower shell 110, so that the shielding body 220 can form a loop with the electrical "ground". For yet another example, the end of the shielding body 220 can be fixed on the aluminum lower shell 110 by means of clamping, fastener connection, etc. For yet another example, as shown in (b) of FIG. 6, the shielding body 220 can be bent along the folding line; the middle part of the shielding body 220 can be adhered to the shell main body 210 by means of double-sided adhesive tape 231; the two ends of the shielding body 220 can be adhered to the aluminum lower shell 110 by means of conductive adhesive layers 232 and 233, respectively.

[0084] In some possible implementation manners, the thickness of the shielding body 220 can be greater than or equal to a certain threshold value (which can be denoted as a second threshold value). The second threshold value can be a fixed value, or can also be a value related to the material of the shielding body 220.

[0085] In some embodiments, the second threshold value can be a fixed value, for example, 0.3 millimeter (mm), 0.5 mm.

[0086] In actual production, when the shielding body 220 is arranged outside the shell main body 210 by means of clamping, fastener connection, etc., if the shielding body 220 is too thin, it is easy to wrinkle or even break during installation. In the embodiments of the present application, by limiting the lower limit value of the thickness of the shielding body 220, the strength of the shielding body 220 can be ensured.

[0087] In yet other embodiments, the second threshold value can be related to the material of the shielding body 220. For example, the second threshold value can be related to the skin depth of the material.

[0088] 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 is reduced 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:

[0089] Wherein, δ can represent the skin depth, ρ 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 μr) of the material and the magnetic permeability of vacuum (denoted as μ0), i.e., μ = μr*μ0. r , μ0 = 4π × 10-7H / m. r , μ0 = 4π × 10-7H / m.-7 henry per meter (H / m).

[0090] Suppose the frequency of the current is 9 kilo- (kilo-) hertz (Hz); in the case where the frequency of the current is 9 kHz, the skin depth of the conductors of different materials can be as shown in Table 1.

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

[0092] Exemplarily, the second threshold value can be determined according to the skin depth. For example, the threshold value can be 30% or 50% of the skin depth, or can be greater than or equal to the skin depth; the threshold value can be set according to the required shielding effect.

[0093] For example, the shielding body 220 is affected by the interference magnetic flux and generates a shielding circulating current. Suppose the frequency of the circulating current is less than or equal to 9 kHz; in the case of an aluminum shielding body 220, a thickness greater than or equal to the skin depth of 0.86 mm can achieve a better shielding effect. In this example, the second threshold value can be equal to the skin depth. For another example, the second threshold value can also be set with a certain margin (such as 0.05 mm or 0.1 mm) based on the skin depth.

[0094] The structure of the upper shell 200 is exemplarily described above in combination with FIGS. 2 to 6. The electromagnetic shielding effect of the upper shell 200 is exemplarily described below in combination with FIGS. 7 to 9. FIGS. 7 to 9 can be understood as schematic diagrams of the results of two test scenarios (denoted as test scenario A and test scenario B). In both test scenario A and test scenario B, the battery pack is used to power the driving motor, and the 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 shell 120 without electromagnetic shielding function, while in test scenario B, the battery pack uses an upper shell 200 provided with a shielding body 220. That is, in test scenario A and B, except that the upper shell used by the battery pack is different, other conditions are the same, such as using the same vehicle for testing in the two test scenarios.

[0095] FIGS. 7 and 8 respectively show the color cloud maps of the electromagnetic noise in the vehicle in the two test scenarios (denoted as test scenario A and B).

[0096] FIGS. 7(a) and (b) respectively show the color cloud maps of the electromagnetic noise of the front row and the rear row of the cabin in test scenario A. Similarly, FIGS. 8(a) and (b) respectively show the color cloud maps of the electromagnetic noise of the front row and the rear row of the cabin in test scenario B.

[0097] Referring to (a) and (b) in FIG. 7, when the rotating speed of the driving motor is 1000-9000 revolutions per minute (rpm), the maximum electromagnetic noise in the cabin can reach 30 decibels (dB). Referring to (a) and (b) in FIG. 8, when the upper housing 200 provided with the shielding body 220 is used, the electromagnetic noise in the cabin will be greatly reduced, and the electromagnetic noise in the cabin will be much less than 30 dB.

[0098] FIG. 9 shows the improvement effect of the shielding body made of different materials on the electromagnetic noise in the vehicle. As shown in FIG. 9, by providing the shielding structure made of aluminum foil or copper foil in the upper housing 200, the electromagnetic noise in the cabin can be effectively reduced.

[0099] The above describes the upper housing 200 provided by the embodiments of the present application with reference to FIGS. 2-9.

[0100] The embodiments of the present application also provide a battery pack, which can include the upper housing 200 and any possible implementation manner.

[0101] The embodiments of the present application also provide a vehicle, which can also include the upper housing 200 and any possible implementation manner, or can include the battery pack.

[0102] The vehicle involved in the embodiments of the present application is a vehicle in a broad sense, which can be a traffic tool (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 the 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.

[0103] The detailed description and the accompanying 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, i.e., the present application is not limited to the described embodiments.

[0104] Unless otherwise required by context, as used herein the term "comprise" and variations of the term, such as "comprises" and "comprising," will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. In describing the embodiments of the application, specific terminology is used for the sake of clarity. The terminology used is that set forth by the IEEE in 1002-2000, IEEE Standard Dictionary of Electrical and Electronics Terms (Sixth Edition, 2000). The use of such specific terminology is not intended to limit the application, but rather to provide specific examples of the application. The description of the embodiments of the application is not meant to be limiting.

[0105] The terms "first", "second", and the like, as used herein, do not imply a relative importance, unless otherwise required by context. Thus, the features identified as "first", "second", etc. can include one or more of the features identified with that term. In the description of the embodiments of the application, the term "a plurality" means two or more, unless otherwise specified.

[0106] The orientation terms appearing in the description of the embodiments of the application are the directions shown in the drawings and do not limit the specific structure of the embodiments of the application. In the description of the embodiments of the application, it should be further noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, e.g. fixed connection, detachable connection, or integral connection; direct connection, or indirect connection through an intermediate medium. The specific meanings of the above terms in the application can be understood by those skilled in the art according to the specific circumstances.

[0107] Reference to "an embodiment" in the description of the application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent of other embodiments or optional embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described by the application can be combined with other embodiments.

[0108] The term "and / or" in the present application is merely used to describe an associated relationship, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally means that the front and rear associated objects are in an "or" relationship.

[0109] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the 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.

[0110] In addition, the use of "based on" means openness and inclusiveness, because the process, step, calculation or other action based on one or more conditions or values can be based on additional conditions or beyond the values in practice.

[0111] The "about", "approximately" or "approximately" in the embodiments of the present application includes the values stated and the average values within the acceptable deviation range of the specific values, wherein the acceptable deviation range is determined by the person skilled in the art considering the measurement being discussed and the error related to the measurement of the specific quantity, i.e. the limitation of the measurement system.

[0112] In several embodiments provided in the present application, it should be understood that the above-described embodiments are merely 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.

[0113] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the 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 polymer material, and the shielding body (220) comprises a shielding structure made of an electrically or magnetically conductive material; the shielding body (220) is arranged on the outside of 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 on the inside of 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 centimeters.

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, 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 is greater than or equal to a skin depth that satisfies the following condition: wherein, δ represents the skin depth, ρ represents the resistivity of the material adopted by the shielding structure, f represents the frequency of the current in the shielding structure, μ represents the magnetic permeability of the material adopted by the shielding structure, and π represents the 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 body part is made of sheet film plastic SMC or long glass fiber reinforced polypropylene PP-LGF.

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

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