Electromagnetic shielding structure, battery shell, battery and energy storage device

Abstract

The utility model relates to the technical field of batteries, in particular to an electromagnetic shielding structure, a battery shell, a battery and an energy storage device, the electromagnetic shielding structure is used for preventing electromagnetic waves outside the battery shell from interfering a sensitive device in the battery shell, the shielding structure comprises conductive cloth, and the conductive cloth is arranged on the surface of an upper shell; and the conductive cloth can completely cover the orthographic projection of the sensitive device on the upper shell. Interference is blocked and discharged from a propagation path on the basis of the EMC three-element principle, electromagnetic waves outside the battery shell can be effectively prevented from interfering sensitive devices in the battery shell, the defect that the anti-interference capability is poor due to the fact that an upper shell of the power battery pack is made of a non-conductive material is overcome, cost reduction and light weight of the power battery pack are achieved, and the power battery pack is suitable for large-scale popularization and application. And the anti-interference capability of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to electromagnetic shielding structures, battery casings, batteries, and energy storage devices. Background Technology

[0002] As one of the core components of electric vehicles, the power battery pack faces increasing challenges due to the widespread application of electronic technology in automobiles. High-power narrowband signals generated by Bluetooth, radio, and 5G & GSM communication signals, coupled with the industry's trend towards cost reduction and lightweighting, mean that the top cover of most power battery packs is now made of non-sheet metal materials. This compromises the shielding structure of traditional sheet metal top covers, exacerbating electromagnetic compatibility issues in new energy vehicles. To prevent electromagnetic interference from in-vehicle handheld electronic devices from affecting the normal operation of electronic and electrical equipment within the power battery pack and to ensure the safety of passengers, the anti-interference capability of the power battery pack is crucial.

[0003] The existing power battery pack shells are mostly made of non-sheet metal materials, resulting in a lack of overall shielding for the power battery pack. Interference can easily enter the power battery pack, thereby affecting the control and communication systems inside the power pack. Currently, the industry often uses conductive interlayer spray coating for full coverage or a cover plate integrated metal shielding mesh for shielding. The disadvantages of this are high cost, complex process, and poor feasibility. Utility Model Content

[0004] This application provides an electromagnetic shielding structure, a battery casing, a battery, and an energy storage device to solve the problem in the prior art where the overall shielding of the power battery pack is lacking, allowing interference to easily enter the power battery pack and thus affecting the control and communication systems within the power pack.

[0005] On the one hand, this application provides an electromagnetic shielding structure for preventing electromagnetic waves outside the battery casing from interfering with sensitive devices inside the battery casing. The shielding structure includes a conductive cloth, which is disposed on the surface of the upper casing and can completely cover the orthographic projection of the sensitive device on the upper casing.

[0006] In one possible design, the conductive cloth is rectangular and has adjacent first and second sides. The upper housing has adjacent first and second side edges, with the first side extending to coincide with the first side edge and the second side edge extending to coincide with the second side edge.

[0007] In one possible design, the length of the first side is X, the length of the second side is Y, the length of the orthographic projection of the sensing device onto the upper housing is a, the width of the orthographic projection of the sensing device onto the upper housing is b, the distance from the center point of the orthographic projection of the sensing device onto the upper housing to the second side edge is a1, and the distance from the center point of the orthographic projection of the sensing device onto the upper housing to the first side edge is b1, where X = (a + 480) / 2 + a1; Y = (b + 480) / 2 + b1.

[0008] In one possible design, the conductive cloth is electrically connected to the lower housing.

[0009] In one possible design, the edge of the conductive cloth extends to the edge of the upper housing, and a first through hole is formed at the edge of the conductive cloth. The edges of the upper housing and the lower housing are respectively formed with second through holes, and a bolt is inserted through both the first through hole and the second through hole.

[0010] In one possible design, the shielding structure also includes a conductive interlayer located between the edges of the upper and lower housings.

[0011] In one possible design, the conductive interlayer is conductive foam.

[0012] In one possible design, the conductive fabric has a conductive adhesive layer on the side near the upper housing;

[0013] And / or, the surface of the upper housing is provided with a limiting groove, and the conductive cloth is located in the limiting groove.

[0014] On the other hand, this application also provides a battery housing, including the electromagnetic shielding structure described above.

[0015] Furthermore, this application also provides a battery, including the battery casing as described above.

[0016] In another aspect, this application also provides an energy storage device, including the battery described above.

[0017] The beneficial effects of this application are as follows:

[0018] The electromagnetic shielding structure of this application, by laying conductive cloth on the surface of the upper shell, and the conductive cloth being able to completely cover the orthographic projection of the sensitive device on the upper shell, blocks and discharges interference from the propagation path based on the three elements of EMC. It can effectively prevent electromagnetic waves outside the battery shell from interfering with the sensitive device inside the battery shell, make up for the shortcomings of the poor anti-interference ability of the upper shell of the power battery pack using non-conductive materials, achieve cost reduction and weight reduction of the power battery pack, and improve the anti-interference ability of the battery.

[0019] The battery casing provided in this application incorporates the electromagnetic shielding structure described in this application, and therefore includes all the advantages of the electromagnetic shielding structure mentioned above.

[0020] The battery provided in this application, since it includes the battery casing of this application, also includes all the above-mentioned advantages of the battery casing.

[0021] The energy storage device provided in this application includes the battery described in this application, and therefore also includes all the advantages of the battery mentioned above. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the electromagnetic shielding structure provided in the embodiments of this application;

[0024] Figure 2 This is a field uniformity distribution diagram of the radiating interference antenna in the low-frequency band;

[0025] Figure 3 This is a field uniformity distribution diagram of the radiating interference antenna in the mid-frequency band;

[0026] Figure 4 This is a field uniformity distribution diagram of the radiating interference antenna in the high-frequency band;

[0027] Figure 5 This is a schematic diagram showing the relationship between the size of the conductive cloth and the location of the sensitive device.

[0028] Figure 6 A schematic diagram showing the relationship between the location of the conductive cloth on the upper housing and the location of the sensitive device. Figure 1 .

[0029] Figure label:

[0030] 100, Conductive cloth; 110, First side edge; 120, Second side edge; 130, First through hole; 200, Upper housing; 210, First side edge; 220, Second side edge; 230, Second through hole; 300, Lower housing; 400, Sensitive device; 500, Bolt; 600, Conductive interlayer. Detailed Implementation

[0031] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The following is combined Figures 1-6 This describes the electromagnetic shielding structure provided in the embodiments of this application.

[0033] Reference Figure 1As shown in the illustration, this application provides an electromagnetic shielding structure to prevent electromagnetic waves from outside the battery casing from interfering with the sensitive device 400 inside the battery casing. The sensitive device 400 refers to equipment or systems sensitive to electromagnetic interference, also known as interference-affected equipment. These devices may experience performance degradation or functional failure after being affected by interference signals. Generally, the sensitive devices 400 are rectangularly distributed within the battery pack, and the orthographic projection of the sensitive devices 400 onto the upper casing 200 is rectangular. The shielding structure includes a conductive cloth 100, which is laid on the surface of the upper casing 200 and can completely cover the orthographic projection of the sensitive devices 400 onto the upper casing 200.

[0034] Using the technical solution provided in the above embodiments, by laying a conductive cloth 100 on the surface of the upper housing 200, the conductive cloth 100 can completely cover the orthographic projection of the sensitive device 400 on the upper housing 200. Based on the EMC three-element principle, interference is blocked and discharged from the propagation path, which can effectively prevent electromagnetic waves outside the battery housing from interfering with the sensitive device 400 inside the battery housing. This makes up for the shortcomings of the upper housing 200 of the power battery pack being poor in anti-interference ability due to the use of non-conductive materials, thereby achieving cost reduction and weight reduction of the power battery pack and improving the anti-interference ability of the battery.

[0035] Reference Figures 2-4 As shown, in some embodiments of this application, the conductive cloth 100 is rectangular in shape, and the specific dimensions of the conductive cloth 100 are determined based on the field uniformity radiation antenna pattern of the interfering antenna. Specifically, as... Figure 1 , Figure 2 , Figure 3 These are field uniformity distribution diagrams of the radiating interference antenna in the low, medium, and high frequency bands, respectively. Figure 1 As shown in the field uniformity simulation diagram, the high-energy radiation interference is mainly concentrated in the area indicated by the green line. The blue line area can cover the entire low-frequency radiation area; therefore, the dimensions of the conductive cloth 100 in the low-frequency area are 150mm*130mm. Similarly, from... Figure 2 The field uniformity simulation diagram shows that the dimensions of the conductive cloth 100 in the mid-frequency region are 240mm*120mm; Figure 3 From the field uniformity simulation diagram, it can be seen that the size of the conductive cloth 100 in the high-frequency region is 160mm*120mm; therefore, based on the antenna field uniformity distribution diagram, the size of the conductive cloth 100 with the maximum coverage at the center point of the radiation source is 240mm*240mm; in addition, based on the near-field radiation interference RF test principle, both the transmitter antenna blades and the fan core will radiate interference, so the dimensions of the top, bottom, left, and right edges need to be increased by 120mm. Therefore, the final size of the conductive cloth 100 based on a center point is 480mm*480mm.

[0036] Since the sensitive components 400 inside the battery pack are arranged in a rectangular shape, the dimensions of the conductive cloth 100 are designed with reference to the sensitive components 400 as follows: Figure 5 As shown, the sensitive device 400 ( Figure 5 Using the four corners of the dashed rectangle in the image as reference points, the dimensions of the conductive cloth 100 based on the sensitive device can be determined by extending 240mm outwards from each corner. Figure 5 (The largest rectangle in the middle).

[0037] Since the sensitive device 400 is typically positioned near a corner of the battery pack, specifically, the conductive cloth 100 is rectangular and has adjacent first side 110 and second side 120. The upper housing 200 has adjacent first side edge 210 and second side edge 220. The first side edge 110 extends to coincide with the first side edge 210, and the second side edge 120 extends to coincide with the second side edge 220. In other words, the conductive cloth 100 covers one corner of the upper housing 200 (the corner closest to the sensitive device 400). Therefore, only the position of the upper housing 200 corresponding to the sensitive device 400 needs to be covered with the conductive cloth 100; that is, the actual size of the conductive cloth 100 is smaller than... Figure 5 The dimensions of the conductive cloth 100 are calculated in the figure. For details, refer to... Figure 6 As shown, the length of the first side 110 of the conductive cloth 100 is X, the length of the second side 120 of the conductive cloth 100 is Y, the length of the orthographic projection of the sensing device 400 onto the upper housing 200 is a, the width of the orthographic projection of the sensing device 400 onto the upper housing 200 is b, the distance from the center point of the orthographic projection of the sensing device 400 onto the upper housing 200 to the second side edge 220 is a1, and the distance from the center point of the orthographic projection of the sensing device 400 onto the upper housing 200 to the first side edge 210 is b1, where X = (a + 480) / 2 + a1; Y = (b + 480) / 2 + b1. Of course, Figure 6 This illustration only shows the case where the two sides of the sensing device 400 coincide with the two sides of the upper housing 200. In other embodiments, there may be a certain distance between the two sides of the sensing device 400 and the two sides of the upper housing 200.

[0038] Reference Figure 1As shown, in some embodiments of this application, the conductive cloth 100 is electrically connected to the lower housing 300, thereby grounding the conductive cloth 100. In some embodiments, the edge of the conductive cloth 100 extends to the edge of the upper housing 200, and a first through hole 130 is formed at the edge of the conductive cloth 100. Second through holes 230 are formed at the edges of the upper housing 200 and the lower housing 300, respectively. A bolt 500 passes through both the first through hole 130 and the second through hole 230. Thus, without changing the connection structure between the upper housing 200 and the lower housing 300 of the battery, the conductive cloth 100 can be electrically connected to the lower housing 300 via the bolt 500. In some specific embodiments, the shielding structure further includes a conductive interlayer 600, which is located between the edge of the upper housing 200 and the edge of the lower housing 300. Specifically, the conductive interlayer 600 is conductive foam. By filling the space between the upper housing 200 and the lower housing 300 with conductive foam, the lower housing 300, conductive foam, upper housing 200, and conductive cloth 100 can form conductive continuity while ensuring the overall sealing of the package. This ensures the compression amount while meeting the low impedance path for interference discharge.

[0039] In some embodiments of this application, the conductive cloth 100 has a conductive adhesive layer on the side near the upper housing 200, and the conductive cloth 100 adheres to the surface of the upper housing 200 through the conductive adhesive layer. In other embodiments, the surface of the upper housing 200 is provided with a limiting groove, the depth of which is relatively small, for example, the same as the thickness of the conductive cloth 100, thereby playing a limiting role, so that the conductive cloth 100 is attached to the limiting groove along the limiting groove, which can avoid misalignment during installation and avoid the problem of inconsistent shielding area coverage caused by inconsistent installation of the conductive cloth 100, while improving the installation efficiency of the conductive cloth 100.

[0040] This application also provides a battery casing that includes the electromagnetic shielding structure described in the above embodiments. Since the battery casing includes the electromagnetic shielding structure, it also includes all the advantages of the electromagnetic shielding structure described above, which will not be repeated here.

[0041] This application also provides a battery, including the battery casing described in the above embodiments. Since the battery includes the battery casing, it also includes all the advantages of the battery casing described above, which will not be repeated here.

[0042] This application also provides an energy storage device, including the battery described in the above embodiments. The energy storage device can be a vehicle, construction machinery, etc. Since the energy storage device includes a battery, it also includes all the advantages of the battery described above, which will not be repeated here.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An electromagnetic shielding structure, characterized by: The application discloses a shielding structure for preventing electromagnetic wave outside a battery shell from interfering with sensitive devices in the battery shell, which comprises an electrically conductive cloth arranged on the surface of an upper shell and capable of completely covering the orthographic projection of the sensitive devices on the upper shell.

2. The electromagnetic shielding structure of claim 1, wherein: The electrically conductive cloth is rectangular, has a first side edge and a second side edge adjacent to each other, and the upper shell has a first side along and a second side along adjacent to each other, the first side edge extends to coincide with the first side along, and the second side edge extends to coincide with the second side along.

3. The electromagnetic shielding structure of claim 2, wherein: The length of the first side edge is X, the length of the second side edge is Y, the length of the orthographic projection of the sensitive devices on the upper shell is a, the width of the orthographic projection of the sensitive devices on the upper shell is b, the distance from the center point of the orthographic projection of the sensitive devices on the upper shell to the second side along is a1, and the distance from the center point of the orthographic projection of the sensitive devices on the upper shell to the first side along is b1, wherein X=(a+480) / 2+a1, and Y=(b+480) / 2+b1.

4. The electromagnetic shielding structure according to any one of claims 1 to 3, characterized in that: The electrically conductive cloth is electrically connected with a lower shell.

5. The electromagnetic shielding structure of claim 4, wherein: The edge of the electrically conductive cloth extends to the edge of the upper shell, a first through hole is formed in the edge of the electrically conductive cloth, a second through hole is formed in the edge of the upper shell and the lower shell respectively, and a bolt is arranged in the first through hole and the second through hole.

6. The electromagnetic shield structure of claim 5, wherein: The electrically conductive cloth further comprises an electrically conductive interlayer arranged between the edge of the upper shell and the edge of the lower shell.

7. The electromagnetic shield structure of claim 6, wherein: The electrically conductive interlayer is electrically conductive foam. The electrically conductive cloth is provided with an electrically conductive adhesive layer on the side close to the upper shell. The surface of the upper shell is provided with a limiting groove, and the electrically conductive cloth is arranged in the limiting groove.

8. A battery housing characterized by: The application further discloses a battery shell comprising the electromagnetic shielding structure.

9. A battery, characterized by: The application further discloses a battery comprising the battery shell.

10. An energy storage device, characterized by: The application further discloses a battery comprising the battery.

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