Electric vehicle and battery pack thereof

Abstract

The utility model discloses a kind of battery packs, including the box and box cover connected together, the box includes accommodating cavity, the accommodating cavity includes the battery compartment and electrical compartment of interval arrangement, the box cover includes battery compartment sealing area and electrical compartment sealing area, the battery compartment sealing area cover is located at the top of the battery compartment, the electrical compartment sealing area cover is located at the top of the electrical compartment;The box cover includes the cover main body of nonmetal material, the electrical conductivity of the cover main body is 10 ‑7 ~10 ‑14 S / m, the cover main body is at least provided with electromagnetic shielding layer in the electrical compartment sealing area, the electrical conductivity of the electromagnetic shielding layer is 10 6 ~10 8 S / m.The battery pack of the utility model, the weight of box cover is reduced, the insulation of box cover is guaranteed, so that box cover has electromagnetic shielding function, guarantee the normal operation of battery management system in electrical compartment.The utility model further discloses a kind of electric vehicles.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an electric vehicle and its battery pack. Background Technology

[0002] With the development of electric vehicles, people have increasingly higher requirements for their performance. As the power storage device of electric vehicles, the performance of the battery pack directly determines the performance of the electric vehicle. The energy density of the battery pack determines the output performance of the battery. In addition to improving the energy density of the cells, the battery pack needs to be lightweight while meeting performance requirements.

[0003] The battery pack mainly comprises a connected housing, a cover, and individual battery cells housed inside the housing. In the prior art, the cover is made of metal to achieve a shielding effect; however, metal covers are heavy and have poor insulation. To achieve weight reduction and insulation, the cover is made of non-metallic materials, but non-metallic covers are prone to poor shielding performance. Utility Model Content

[0004] In view of this, the present invention provides a battery pack that reduces the weight of the cover, ensures the insulation of the cover, and enables the cover to have electromagnetic shielding function, thereby ensuring the normal operation of the battery management system in the electrical compartment.

[0005] This utility model also provides an electric vehicle.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery pack includes a housing and a cover connected together. The housing includes a receiving cavity comprising a battery compartment and an electrical compartment spaced apart. The cover includes a battery compartment sealing area and an electrical compartment sealing area, the battery compartment sealing area covering the top of the battery compartment, and the electrical compartment sealing area covering the top of the electrical compartment. The cover includes a non-metallic cover body with a conductivity of 10. -7 ~10 -14 S / m, the cover body is provided with an electromagnetic shielding layer at least in the electrical compartment sealing area, and the conductivity of the electromagnetic shielding layer is 10. 6 ~10 8 S / m.

[0008] As can be seen from the above technical solution, the battery pack provided by this utility model uses a non-metallic cover body, thereby achieving the purpose of weight reduction and insulation. By setting an electromagnetic shielding layer in the electrical compartment sealing area of ​​the cover body, the electromagnetic shielding function of the electrical compartment sealing area is increased, realizing electromagnetic shielding of the battery management system located in the electrical compartment, avoiding poor shielding effect, ensuring the reliable operation of the battery management system, and improving the safety performance of the battery pack. By limiting the conductivity of the cover body, the insulation of the cover body is guaranteed. By limiting the conductivity of the electromagnetic shielding layer, the cover can still have a high conductivity, realizing the electromagnetic shielding function, improving the impact of interference signals on the components inside the battery pack, ensuring the normal operation of the battery management system in the electrical compartment, and improving the safety of battery pack control.

[0009] This utility model also provides an electric vehicle, including a chassis and a battery pack, wherein the battery pack is the aforementioned battery pack and the battery pack is fixedly connected to the chassis.

[0010] The electric vehicle of this invention includes the aforementioned battery pack, and therefore possesses the advantages of the aforementioned battery pack, which will not be elaborated here. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of the box provided in an embodiment of the present utility model;

[0013] Figure 2 A schematic diagram of the connection structure of the box cover at one angle provided in an embodiment of this utility model;

[0014] Figure 3 A schematic diagram of the connection structure of the box cover from another angle provided in an embodiment of this utility model;

[0015] Figure 4 A schematic diagram of the structure of the box cover covering the electromagnetic shielding layer area according to an embodiment of the present utility model;

[0016] Figure 5 A schematic diagram of the structure of the box cover covering the electromagnetic shielding layer area provided in another embodiment of the present utility model;

[0017] Figure 6A schematic diagram of the structure of the box cover covering the electromagnetic shielding layer area provided in the third embodiment of this utility model;

[0018] Figure 7 A schematic diagram of the structure of the box cover covering the electromagnetic shielding layer area provided in the fourth embodiment of this utility model;

[0019] Figure 8 A cross-sectional view of the portion of the box cover provided with the electromagnetic shielding layer, as shown in an embodiment of this utility model.

[0020] Figure 9 A schematic diagram of the structure of the box lid with a bent edge provided in an embodiment of this utility model;

[0021] Figure 10 This is a schematic diagram of the structure of the box cover extending to the outside of the box body, provided in an embodiment of the present utility model.

[0022] in:

[0023] 1. Box body,

[0024] 101. Battery compartment; 102. Electrical compartment.

[0025] 2. Box lid,

[0026] 201. Battery compartment sealing area,

[0027] 2011, Second Connection Area; 2012, Second Connection Through Hole; 2013, Second Compartment Covering Area.

[0028] 202. Electrical compartment sealed area,

[0029] 2021, First connecting area; 2022, First connecting through hole; 2023, First compartment covering area; 2024, Raised stiffening plate.

[0030] 203. Cover the main body.

[0031] 204. Electromagnetic shielding layer

[0032] 205. Insulation layer

[0033] 206. Bent edge. Detailed Implementation

[0034] This utility model discloses a battery pack that reduces the weight of the cover, ensures the insulation of the cover, and enables the cover to have electromagnetic shielding function, thus ensuring the normal operation of the battery management system in the electrical compartment.

[0035] This utility model also discloses an electric vehicle.

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] A battery pack is a modular assembly of multiple battery cells arranged according to specific electrical and mechanical structures to provide power. It not only provides a power source but also includes multiple protection and management systems to ensure the safety, efficiency, and lifespan of the battery pack. The battery pack is a critical factor in the proper functioning of an electric vehicle, directly affecting its driving range, charging time, and overall performance. A battery pack mainly consists of a battery pack, a housing containing the battery pack, and a battery management system. The housing includes a casing and a cover, and the battery pack comprises multiple battery cells.

[0038] See Figures 1 to 10 The battery pack of this utility model includes a housing 1 and a cover 2 connected together. The housing 1 includes a receiving cavity, which includes a battery compartment 101 and an electrical compartment 102 spaced apart, as shown below. Figure 1 As shown. The cover 2 includes a battery compartment sealing area 201 and an electrical compartment sealing area 202, as shown. Figure 2 and Figure 3 As shown, the battery compartment sealing area 201 is correspondingly arranged to the battery compartment 101, and the battery compartment sealing area 201 covers the top of the battery compartment 101. The electrical compartment sealing area 202 is correspondingly arranged to the electrical compartment 102, and the electrical compartment sealing area 202 covers the top of the electrical compartment 102. The cover 2 includes a non-metallic cover body 203, and the electrical conductivity of the cover body 203 is 10. -7 ~10 -14 S / m, the cover body 203 is provided with an electromagnetic shielding layer 204 at least in the electrical compartment sealing area 202, and the conductivity of the electromagnetic shielding layer 204 is 10. 6 ~10 8 S / m.

[0039] The battery compartment 101 houses the battery pack, while the electrical compartment 102 houses the battery management system. The battery management system primarily monitors and manages individual lithium-ion battery cells, dynamically monitoring the battery pack's operating status in real time, including parameters such as voltage, resistance, and temperature. This allows for timely detection and handling of leakage or depletion, while simultaneously assessing the condition of each individual battery cell, identifying problematic cells, and ensuring the overall reliability and stability of the battery operation. During operation, the battery generates electromagnetic radiation. This radiation can interfere with the electronic components and circuits in the battery management system, leading to system instability or even failure. For example, during electric vehicle operation, the vehicle encounters various electromagnetic environments, such as radio signals and electromagnetic interference. Without electromagnetic shielding, these interferences can affect the sensors and controllers in the battery management system, causing system misjudgments or malfunctions. High conductivity results in good electrical conductivity and electromagnetic shielding, while low conductivity affects electromagnetic shielding performance but provides good insulation.

[0040] The battery pack of this invention features a cover 2 made of a non-metallic material, 203, to achieve weight reduction and insulation. By providing an electromagnetic shielding layer 204 to the electrical compartment sealing area 202 of the cover 203, the electromagnetic shielding function of the electrical compartment sealing area 202 is enhanced, achieving electromagnetic shielding of the battery management system located within the electrical compartment 102. This avoids situations where shielding is ineffective, ensures the reliable operation of the battery management system, and improves the safety performance of the battery pack. Limiting the conductivity of the cover 203 ensures its insulation. Limiting the conductivity of the electromagnetic shielding layer 204 allows the cover 2 to still maintain high conductivity, achieving electromagnetic shielding, reducing the impact of interference signals on the components inside the battery pack, ensuring the normal operation of the battery management system within the electrical compartment, and improving the safety of battery pack control.

[0041] In one specific embodiment, the electrical compartment sealing area 202 includes a cover body 203, an electromagnetic shielding layer 204, and an insulating layer 205, such as... Figure 8 As shown, the cover body 203, the electromagnetic shielding layer 204, and the insulating layer 205 are stacked sequentially. The electromagnetic shielding layer 204 is disposed between the cover body 203 and the insulating layer 205, and the insulating layer 205 is disposed on the side of the electromagnetic shielding layer 204 near the receiving cavity of the housing 1. The electromagnetic shielding layer 204 is used to shield electromagnetic interference and improve the impact of interference signals on the equipment inside the electrical compartment 102. The insulating layer 205 provides electrical insulation between the electromagnetic shielding layer 204 and the equipment inside the electrical compartment 102. In this embodiment, the battery compartment sealing area 201 only includes the cover body 203.

[0042] Specifically, the electrical compartment sealing area 202 includes a first compartment covering area 2023 and a first connecting area 2021 located at the edge of the first compartment covering area 2023. The first compartment covering area 2023 is used to seal the top opening of the electrical compartment 102, and the first connecting area 2021 is used to connect to the edge of the housing 1. To facilitate the connection of the first connecting area 2021, the first connecting area 2021 is provided with a first connecting through hole 2022 for connecting to the housing 1. Multiple first connecting through holes 2022 are provided, and the multiple first connecting through holes 2022 are evenly distributed in the first connecting area 2021.

[0043] In one embodiment, the electromagnetic shielding layer 204 only covers the first compartment coverage area 2023, such as Figure 4 The shaded area in the image. In another embodiment, to improve electromagnetic shielding performance, the electromagnetic shielding layer 204 covers the first compartment coverage area 2023 and the first connection area 2021, such as... Figure 5 The shaded area in the middle. In this embodiment, to prevent electromagnetic radiation from entering the electrical compartment 102 through the gap at the connection point between the cover 2 and the body 1, a bent edge 206 is provided on the side of the first connection area 2021 away from the first compartment coverage area 2023, such as... Figure 9 As shown, the bent edge 206 protrudes towards the side of the housing 1 and surrounds the outside of the housing 1. An electromagnetic shielding layer 204 is covered on the surface of the bent edge 206 near the housing 1, thereby achieving electromagnetic shielding at the gap where the housing cover 2 connects to the housing 1. Figure 9 The diagram only shows a simplified structural representation of the bent edge 206 of the cover 2, and does not depict the layered structure of the cover 2. Specifically, the thickness W of the bent edge 206 is 1-2 mm. In other embodiments, the thickness W of the bent edge 206 can be set according to actual needs, and is not limited here. The bent edge 206 can be an integral structure with the cover 2, which is stamped. To improve the shielding effect, the side of the first connecting area 2021 away from the first compartment coverage area 2023 can also extend to the outside of the box body 1 with a length L of 1-2 mm, such as... Figure 10 As shown.

[0044] To improve the structural strength of the electrical compartment sealing area 202, a raised stiffener 2024 is provided on the first compartment covering area 2023. The raised stiffener 2024 can be provided to protrude into the inner cavity of the electrical compartment 102, or it can be provided to protrude away from the electrical compartment 102.

[0045] In another embodiment, both the battery compartment sealing area 201 and the electrical compartment sealing area 202 are provided with electromagnetic shielding layers 204, and their cross-sectional views are as follows. Figure 8As shown in the diagram. Specifically, both the battery compartment sealing area 201 and the electrical compartment sealing area 202 include a cover body 203, an electromagnetic shielding layer 204, and an insulating layer 205 stacked together. The electromagnetic shielding layer 204 is disposed between the cover body 203 and the insulating layer 205, and the insulating layer 205 is disposed on the side of the electromagnetic shielding layer 204 near the receiving cavity of the housing 1. By providing the electromagnetic shielding layer 204 in the battery compartment sealing area 201, the electromagnetic radiation of the battery pack placed in the battery compartment 101 is shielded, preventing electromagnetic interference of the battery pack's electromagnetic radiation to the battery management system in the electrical compartment 102. By providing the insulating layer 205 on the side of the electromagnetic shielding layer 204 in the battery compartment sealing area 201 near the battery pack, that is, by placing the insulating layer 205 between the electromagnetic shielding layer 204 and the battery cell, the insulating layer 205 can separate the electromagnetic shielding layer 204 and the battery cell, achieving the purpose of electrical insulation between the electromagnetic shielding layer 204 and the battery cell.

[0046] Furthermore, the battery compartment sealing area 201 includes a second compartment covering area 2013 and a second connection area 2011 located at the edge of the second compartment covering area 2013. An electromagnetic shielding layer 204 covers the surfaces of the second compartment covering area 2013 and the electrical compartment sealing area 202, such as... Figure 6 As shown. The second compartment covering area 2013 is used to seal the top opening of the battery compartment 101, and the second connecting area 2011 is used to connect with the edge of the housing 1. To facilitate the connection between the second connecting area 2011 and the housing 1, the second connecting area 2011 is provided with a second connecting through hole 2012 for connecting with the housing 1. Multiple second connecting through holes 2012 are provided, and the multiple second connecting through holes 2012 are evenly distributed in the second connecting area 2011.

[0047] To achieve better electromagnetic shielding, the electromagnetic shielding layer 204 covers the second compartment coverage area 2013 and the second connection area 2011, that is, it covers the entire surface of the battery compartment sealing area 201 near the battery pack. Figure 7The shaded area is shown in the image. In this embodiment, the entire surface of the battery compartment sealing area 201 and the electrical compartment sealing area 202 is provided with an electromagnetic shielding layer 204. To prevent electromagnetic radiation from entering the electrical compartment 102 through the gap at the connection point between the cover 2 and the housing 1, and to prevent electromagnetic leakage of the battery pack inside the battery compartment 101, the outer edges of the cover 2 are provided with bent edges 206, that is, the edges of the first connection area 2021 and the second connection area 2011 are provided with bent edges 206. After the cover 2 is closed on the housing 1, the bent edges 206 are located on the outer top of the housing 1. The surface of the bent edges 206 near the housing 1 is covered with the electromagnetic shielding layer 204, thereby achieving electromagnetic shielding at the gap at the connection point between the cover 2 and the housing 1. Specifically, the thickness W of the bent edges 206 is 1-2 mm. In other embodiments, the range of the thickness W of the bent edges 206 can also be set according to actual needs, and is not limited here. The bent edge 206 can be integrally stamped with the cover 2. To improve the shielding effect, the edges of the first connection area 2021 and the second connection area 2011 extend to the outside of the enclosure 1 by a length L of 1-2mm.

[0048] In all the above embodiments, an insulating layer 205 is provided on the inner side of the electromagnetic shielding layer 204. The inner side of the electromagnetic shielding layer 204 refers to the side of the electromagnetic shielding layer 204 that is close to the battery pack.

[0049] To ensure the shielding effect of the electromagnetic shielding layer 204, its thickness is 5–50 μm, specifically any value from 5 μm, 15 μm, 25 μm, 35 μm, 50 μm, or any value between any two. If the thickness of the electromagnetic shielding layer 204 is too large, it will affect the overall thickness and weight of the cover 2 and waste material; if the thickness is too small, the electromagnetic shielding effect will be poor. To ensure the insulation effect, the thickness of the insulation layer 205 is 0.9–3.0 mm, specifically any value from 0.9 mm, 1.5 mm, 3.0 mm, or any value between any two. If the thickness of the insulation layer 205 is too large, it will affect the overall weight of the cover 2 and waste material, which is detrimental to lightweight design; if the thickness of the insulation layer 205 is too small, the insulation effect will be poor.

[0050] In the above embodiments, the housing 1 is made of metal, thereby ensuring the structural strength of the housing 1 and its electromagnetic shielding characteristics.

[0051] The cover body 203 includes, but is not limited to, composite materials, polypropylene (PP), polyamide (PA), or polyphenylene oxide (PPE). The cover body 203 is made of a non-metallic material, making it lighter. The electromagnetic shielding layer 204 can be made of, but is not limited to, metallic materials or other composite materials with high electrical conductivity. The electromagnetic shielding layer 204 can be aluminum foil, copper foil, or other metal foils or metal plates. The insulating layer 205 can be made of polypropylene, polyimide, polyethylene terephthalate, or polycarbonate.

[0052] The battery pack of this utility model includes a cover 2 comprising a cover body 203, an electromagnetic shielding layer 204, and an insulating layer 205. The cover body 203 is the main load-bearing structure of the cover 2, reducing its weight and achieving lightweight design. The electromagnetic shielding layer 204 provides the cover 2 with high conductivity, achieving electromagnetic shielding and mitigating the impact of interference signals on the internal components of the battery pack. An insulating layer 205 is placed on the surface of the electromagnetic shielding layer 204 near the battery pack, effectively preventing electrical conduction between the individual battery cells and the electromagnetic shielding layer 204, reducing the risk of short circuits between them.

[0053] This utility model also provides an electric vehicle, including a chassis and a battery pack, wherein the battery pack is the aforementioned battery pack and the battery pack is fixedly connected to the chassis.

[0054] In the description of this solution, it should be understood that 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack comprising a housing and a cover connected together, characterized in that, The housing includes a receiving cavity, which comprises a battery compartment and an electrical compartment spaced apart. The housing cover includes a battery compartment sealing area and an electrical compartment sealing area. The battery compartment sealing area covers the top of the battery compartment, and the electrical compartment sealing area covers the top of the electrical compartment. The housing cover includes a non-metallic cover body with a conductivity of 10. -7 ~10 -14 S / m, the cover body is provided with an electromagnetic shielding layer at least in the electrical compartment sealing area, and the conductivity of the electromagnetic shielding layer is 10. 6 ~10 8 S / m.

2. The battery pack according to claim 1, characterized in that, The electrical compartment sealing area includes a cover body, an electromagnetic shielding layer, and an insulating layer stacked in sequence, with the insulating layer disposed on the side of the electromagnetic shielding layer near the receiving cavity.

3. The battery pack according to claim 2, characterized in that, The battery compartment sealing area includes a cover body.

4. The battery pack according to claim 2, characterized in that, The electrical compartment sealing area includes a first compartment coverage area and a first connection area located at the edge of the first compartment coverage area. The first connection area is provided with a first connection through hole for connecting to the housing. The electromagnetic shielding layer covers at least the first compartment coverage area.

5. The battery pack according to claim 4, characterized in that, The electromagnetic shielding layer covers the first compartment coverage area and the first connection area.

6. The battery pack according to claim 5, characterized in that, At least one bent edge is provided on the side of the first connecting area away from the first compartment coverage area, the bent edge protrudes toward the box body, and the bent edge surrounds the outside of the box body; The electromagnetic shielding layer is covered on the surface of the bent edge near the housing. The thickness of the bent edge is 1-2 mm.

7. The battery pack according to claim 5, characterized in that, At least the length of the first connecting area extending to the outside of the box body on the side away from the first compartment coverage area is 1-2 mm.

8. The battery pack according to claim 1, characterized in that, The electromagnetic shielding layer is provided in both the battery compartment sealing area and the electrical compartment sealing area.

9. The battery pack according to claim 8, characterized in that, Both the battery compartment sealing area and the electrical compartment sealing area include a cover body, an electromagnetic shielding layer and an insulating layer stacked in sequence, with the insulating layer disposed on the side of the electromagnetic shielding layer near the receiving cavity.

10. The battery pack according to claim 8 or 9, characterized in that, The battery compartment sealing area includes a second compartment covering area and a second connection area located at the edge of the second compartment covering area. The second connection area is provided with a second connection through hole for connecting to the housing. The electromagnetic shielding layer covers at least the second compartment covering area.

11. The battery pack according to claim 10, characterized in that, The electromagnetic shielding layer covers the second compartment coverage area and the second connection area.

12. The battery pack according to claim 1, characterized in that, The thickness of the electromagnetic shielding layer is 5–50 μm.

13. The battery pack according to claim 2, characterized in that, The thickness of the insulating layer is 0.9 to 3.0 mm.

14. An electric vehicle, comprising a chassis and a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1-13, and the battery pack is fixedly connected to the chassis.

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