Battery pack and electric vehicle

Abstract

The utility model provides a battery pack and an electric automobile. The battery pack comprises a liquid cooling plate and a battery pack, the shell is arranged on the liquid cooling plate in a covering mode, and a first containing cavity is jointly formed between the shell and the liquid cooling plate; the fuse is located in the first containing cavity, and the fuse and the liquid cooling plate are arranged in an insulated mode; and the heat conduction piece is arranged between the fuse and the liquid cooling plate, and the fuse and the liquid cooling plate conduct heat exchange through the heat conduction piece. According to the technical scheme of the utility model, the technical problem of high temperature rise of the fuse in the prior art can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and particularly relates to a battery pack and an electric vehicle. Background Art

[0002] In the related art, the heat dissipation of the battery pack is mainly in the form of liquid cooling, and the bottom plate of the battery pack is the liquid cooling plate. A fuse is arranged in the battery pack. The fuse is also called a fuse wire. When a short circuit occurs in the battery in the battery pack, the fuse melts in time to play a role in disconnecting the circuit. Multiple batteries in the battery pack are connected in series and parallel to form a large energy body, so that the current of the entire battery pack converges at the position of the fuse. Therefore, the heat generation power here is relatively large and the temperature rise is relatively high. Currently, the fuse is mainly placed in the battery pack for natural cooling. However, the internal space of the battery pack is limited, and the arrangement positions of multiple components are relatively close. For example, the fuse is close to the BMU (BMU, Battery Monitor Unit sampling unit), communication wiring harness, explosion-proof valve, etc. When the temperature rise of the fuse is relatively high, it will affect the normal operation of other components. Summary of the Utility Model

[0003] The embodiments of the utility model provide a battery pack and an electric vehicle, which can improve the technical problem of relatively high temperature rise of the fuse in the related art.

[0004] In a first aspect, the embodiments of the utility model provide a battery pack, which includes: a liquid cooling plate; a housing covering the liquid cooling plate, and a first accommodation cavity is jointly formed between the housing and the liquid cooling plate; a fuse located in the first accommodation cavity; a heat conducting member arranged between the fuse and the liquid cooling plate, and heat exchange is carried out between the fuse and the liquid cooling plate through the heat conducting member.

[0005] In one embodiment, the heat conducting member includes heat conducting gel.

[0006] In one embodiment, the heat conduction coefficient of the heat conducting member is λ, and 1.2W / m·K ≤ λ ≤ 3W / m·K.

[0007] In one embodiment, the battery pack further includes an insulating member. The insulating member is arranged in the first accommodation cavity and connected to the liquid cooling plate. The insulating member has a second accommodation cavity. The fuse has a connecting portion, and the connecting portion is fixed in the second accommodation cavity. At least the connecting portion and the bottom wall of the second accommodation cavity are filled with the heat conducting member.

[0008] In one embodiment, the insulating member further includes a strengthening structure. The strengthening structure is arranged in the second accommodation cavity and extends along the height direction of the insulating member. The strengthening structure divides the second accommodation cavity into a first chamber, a second chamber, and a third chamber, and the connecting portion is arranged in the first chamber and / or the third chamber.

[0009] In one embodiment, the battery pack further includes a connecting member disposed between the connecting portion and the bottom wall of the second receiving cavity. One end of the connecting member is connected to the bottom wall of the second receiving cavity, and the other end of the connecting member is connected to the connecting portion, so that the connecting portion is spaced apart from the bottom wall of the second receiving cavity. The heat conducting member at least fills the gap between the connecting portion and the bottom wall of the second receiving cavity.

[0010] In one embodiment, the battery pack further includes a fixing member disposed between the insulating member and the liquid cooling plate. A first fixing hole is provided on the bottom wall of the second chamber. The fixing member has a second fixing hole corresponding to the first fixing hole, and the liquid cooling plate has a third fixing hole corresponding to the first fixing hole. A fastening member passes through the first fixing hole, the second fixing hole, and the third fixing hole in sequence, so that the insulating member, the fixing member, and the liquid cooling plate are fixedly connected.

[0011] In one embodiment, the battery pack further includes a connecting row. One end of the connecting row is connected to the other end of the connecting member, and one end of the connecting row is electrically connected to the connecting portion, and the other end of the connecting row is electrically connected to the components in the first receiving cavity.

[0012] In one embodiment, the heat conducting member covers the connecting portion.

[0013] In one embodiment, the housing includes a cover plate and a plurality of side plates. The plurality of side plates are disposed around the periphery of the cover plate along the circumferential direction of the cover plate. The liquid cooling plate, the plurality of side plates, and the cover plate jointly enclose to form a first receiving cavity.

[0014] In a second aspect, an embodiment of the present invention provides an electric vehicle, and the electric vehicle includes the above-mentioned battery pack.

[0015] Applying the technical solution of the present invention, the fuse is insulated from the liquid cooling plate, and at the same time, a heat conducting member is disposed between the fuse and the liquid cooling plate. With such a setting, when the temperature rise at the fuse is relatively high, the heat conducting member can timely exchange heat between the heat at the fuse and the liquid cooling plate, thereby reducing the temperature at the fuse and enabling the fuse to be at a normal operating temperature. This can not only ensure the normal operation of the fuse, but also avoid the influence of the relatively high temperature rise of the fuse on the normal operation of the components around the fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 is a three-dimensional schematic diagram of the battery pack provided by the embodiment of the present invention;

[0018] Figure 2 is a perspective three-dimensional schematic diagram of another perspective of the battery pack provided by the embodiment of the present utility model;

[0019] Figure 3 is an assembly schematic diagram of a fuse, a heat conducting member, an insulating member, a connecting member, a fixing member, and a connecting row provided by the embodiment of the present utility model;

[0020] Figure 4 is a cross-sectional schematic diagram of a fuse, a heat conducting member, an insulating member, a connecting member, a fixing member, and a connecting row provided by the embodiment of the present utility model;

[0021] Figure 5 is an exploded schematic diagram of a fuse, a heat conducting member, an insulating member, a connecting member, a fixing member, and a connecting row provided by the embodiment of the present utility model;

[0022] Figure 6 is a structural schematic diagram of the insulating member provided by the embodiment of the present utility model;

[0023] Figure 7 is a structural schematic diagram of the fixing member provided by the embodiment of the present utility model;

[0024] Figure 8 is a partial structural schematic diagram of the liquid cooling plate provided by the embodiment of the present utility model.

[0025] Among them, the above-mentioned drawings include the following reference numerals:

[0026] 10. Liquid cooling plate; 11. Third fixing hole;

[0027] 20. Housing; 21. First accommodating cavity; 22. Cover plate; 23. Side plate;

[0028] 30. Fuse; 31. Connecting portion;

[0029] 40. Heat conducting member;

[0030] 50. Insulating member; 51. Second accommodating cavity; 511. First chamber; 512. Second chamber; 513. Third chamber; 52. Reinforcing structure; 53. First fixing hole;

[0031] 60. Connecting member;

[0032] 70. Fixing member; 71. Second fixing hole;

[0033] 80. Connecting row;

[0034] X. Height direction of the insulating member. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present utility model.

[0036] As Figures 1 to 8 shown, in a first aspect, an embodiment of the present utility model provides a battery pack, which includes: a liquid cooling plate 10; a housing 20 covering the liquid cooling plate 10, and a first accommodation cavity 21 is jointly formed between the housing 20 and the liquid cooling plate 10; a fuse 30 located in the first accommodation cavity 21; a heat conducting member 40 disposed between the fuse 30 and the liquid cooling plate 10, and heat exchange is performed between the fuse 30 and the liquid cooling plate 10 through the heat conducting member 40.

[0037] Applying the technical solution of the present utility model, the fuse 30 is insulated from the liquid cooling plate 10, and at the same time, a heat conducting member 40 is disposed between the fuse 30 and the liquid cooling plate 10. With this setting, when the temperature rise at the fuse 30 is relatively high, the heat conducting member 40 can timely perform heat exchange between the heat at the fuse 30 and the liquid cooling plate 10, thereby reducing the temperature at the fuse 30 and keeping the fuse 30 at a normal operating temperature. This can not only ensure the normal operation of the fuse 30, but also avoid the influence of the relatively high temperature rise of the fuse 30 on the normal operation of the components around the fuse 30.

[0038] In one embodiment, the heat conducting member 40 includes a heat conducting gel. The heat conducting gel is a gel-like silicone-based heat conducting material, which is formed by stirring, mixing, and encapsulating and curing silicone resin, cross-linking agent, heat conducting filler, etc.

[0039] Since the heat conducting gel has a soft texture and strong surface affinity, it can be compressed into various thin shapes, which is convenient for being disposed between the fuse 30 and the liquid cooling plate 10. Moreover, the heat conducting performance of the heat conducting gel is much higher than that of traditional air heat conduction, which can effectively realize the heat transfer between the fuse 30 and the liquid cooling plate 10 to reduce the operating temperature of the fuse 30, thereby improving the stability and reliability of the fuse 30 during use. At the same time, the heat conducting gel has a high heat conduction coefficient and can quickly transfer heat from the fuse 30 to the liquid cooling plate 10, ensuring that the fuse 30 can also maintain a low temperature during high-load operation.

[0040] Furthermore, the thermal conductive gel has good plasticity and can easily adapt to various irregular or uneven spaces, ensuring good thermal contact between the fuse 30 and the liquid cooling plate 10. At the same time, the thermal conductive gel has good electrical insulation performance, which can prevent safety problems such as electrical short - circuit and leakage while ensuring the thermal conduction effect, so as to improve the stability of the fuse 30 during use. And the thermal conductive gel can still maintain stable performance under harsh environments such as high temperature and high humidity, and will not fail due to environmental changes, which can ensure the stability of the use of the thermal conductive gel.

[0041] Specifically, compared with traditional thermal conductive silicone grease, the thermal conductive gel will not precipitate silicone oil after long - term use, avoiding the corrosion and pollution of the silicone oil to the fuse 30, which is beneficial to extending the service life of the fuse 30. And the thermal conductive gel usually exists in a gel state, which is convenient for construction, easy to apply and clean. In addition, the thermal conductive gel does not contain harmful substances and is pollution - free to the environment. At the same time, the recyclability of the thermal conductive gel is also relatively high, meeting the requirements of sustainable development.

[0042] In one embodiment, the thermal conductivity of the heat - conducting member 40 is λ, and 1.2W / m·K ≤ λ ≤ 3W / m·K. When λ > 3W / m·K, the thermal conductivity of the heat - conducting member 40 is too large, which will keep the temperature of the fuse 30 at a relatively low level, thus making it inconvenient for the normal operation of the fuse 30. When λ < 1.2W / m·K, the thermal conductivity of the heat - conducting member 40 is too small, and the rate of heat conduction in the heat - conducting member 40 is slow, which may cause heat to concentrate in a local area of the fuse 30, forming a local high temperature. This situation is particularly obvious when affected by an external heat source, and it is difficult for the heat to quickly exchange heat with the liquid cooling plate 10, so local high temperature may be generated, which may affect the normal operation of the fuse 30. Therefore, setting 1.2W / m·K ≤ λ ≤ 3W / m·K not only facilitates the normal operation of the fuse 30, but also can improve the rate of heat conduction in the heat - conducting member 40, prevent heat from concentrating in a local area of the fuse 30 to form a local high temperature, and is beneficial to realizing the timely heat exchange between the fuse 30 and the liquid cooling plate 10. Optionally, λ can be set to 1.2W / m·K, 2W / m·K or 3W / m·K, etc. The specific setting should be selected according to the use environment of the heat - conducting member 40, so as to improve the applicable range of the heat - conducting member 40.

[0043] In one embodiment, the battery pack further includes an insulating member 50. The insulating member 50 is disposed in the first accommodation cavity 21 and connected to the liquid cooling plate 10. The insulating member 50 has a second accommodation cavity 51. The fuse 30 has a connecting portion 31. The connecting portion 31 is fixed in the second accommodation cavity 51. At least a heat conducting member 40 is filled between the connecting portion 31 and the bottom wall of the second accommodation cavity 51. Disposing the connecting portion 31 in the insulating member 50 can provide electrical isolation for the fuse 30, that is, isolate different parts in the electrical system, prevent current from flowing on an unnecessary path, and reduce the risk of equipment damage. At the same time, the insulating member 50 can prevent current from flowing to the human body through an unexpected path, thereby preventing electric shock accidents and being beneficial to ensuring the safety of the fuse 30.

[0044] Furthermore, the insulating member 50 can also protect the fuse 30 from the influence of the external environment, such as moisture, dust, chemical corrosion, etc. The insulating member 50 can resist the above-mentioned adverse factors, ensure the normal operation of the fuse 30, and improve the reliability of the fuse 30 during use.

[0045] In one embodiment, the insulating member 50 further includes a reinforcing structure 52. The reinforcing structure 52 is disposed in the second accommodation cavity 51 and extends along the height direction of the insulating member 50. The reinforcing structure 52 divides the second accommodation cavity 51 into a first chamber 511, a second chamber 512, and a third chamber 513. The connecting portion 31 is disposed in the first chamber 511 and / or the third chamber 513. With this arrangement, not only can the overall structural strength of the insulating member 50 be improved, but also the heat conducting member 40 in the first chamber 511 and / or the third chamber 513 can be prevented from flowing into the second chamber 512, thereby causing waste of the heat conducting member 40. Therefore, the use cost of the heat conducting member 40 can be reduced to a certain extent.

[0046] In the present application, there is a gap between the reinforcing structure 52 and the bottom of the fuse 30. Optionally, the reinforcing structure 52 can be in contact with the bottom of the fuse 30. In this way, the fuse 30 can be supported, and the stability of the fuse 30 after being installed in the second accommodation cavity 51 can be ensured.

[0047] In one embodiment, the battery pack further includes a connecting member 60. The connecting member 60 is disposed between the connecting portion 31 and the bottom wall of the second accommodation cavity 51. One end of the connecting member 60 is connected to the bottom wall of the second accommodation cavity 51, and the other end of the connecting member 60 is connected to the connecting portion 31, so that the connecting portion 31 is spaced from the bottom wall of the second accommodation cavity 51. The heat conducting member 40 at least fills the gap between the connecting portion 31 and the bottom wall of the second accommodation cavity 51. In the present application, the connecting member 60 is specifically an insulating column. With this arrangement, not only can the insulation effect between the insulating member 50 and the fuse 30 be further improved, but also a certain space is reserved for the filling of the heat conducting member 40, which is beneficial to filling enough heat conducting member 40 to improve the heat conduction effect.

[0048] In one embodiment, the battery pack further includes a fixing member 70 disposed between the insulating member 50 and the liquid cooling plate 10. A first fixing hole 53 is provided on the bottom wall of the second chamber 512. The fixing member 70 has a second fixing hole 71 corresponding to the first fixing hole 53, and the liquid cooling plate 10 has a third fixing hole 11 corresponding to the first fixing hole 53. A fastener passes through the first fixing hole 53, the second fixing hole 71, and the third fixing hole 11 in sequence, so that the insulating member 50, the fixing member 70, and the liquid cooling plate 10 are fixedly connected. In this application, the fixing member 70 is specifically a sheet metal part. With such a setting, when the heat conducting member 40 transfers the heat of the fuse 30 to the bottom of the insulating member 50, since the sheet metal part is made of a metal material, it is convenient for heat exchange between the insulating member 50 and the liquid cooling plate 10, so that the heat exchange efficiency between the fuse 30 and the liquid cooling plate 10 can be improved as much as possible.

[0049] Furthermore, the fastener is an insulating fixing bolt. The insulating fixing bolt has excellent insulating performance, can effectively prevent short circuits or electric leakage, and ensure the safe operation of the fuse 30. At the same time, the insulating fixing bolt has good corrosion resistance, so that it can adapt to a variety of working environments.

[0050] In one embodiment, the battery pack further includes a connection row 80. One end of the connection row 80 is connected to the other end of the connecting member 60, and one end of the connection row 80 is electrically connected to the connecting portion 31, and the other end of the connection row 80 is electrically connected to the components in the first accommodation chamber 21. In this application, the left side of the connection row 80 is electrically connected to the negative output copper row, and the right side of the connection row 80 is electrically connected to the MSD (Manual Service Disconnect) connection copper row, which can ensure the stable operation of the circuit inside the battery pack to meet the user's usage requirements.

[0051] In one embodiment, the heat conducting member 40 covers the connecting portion 31. With such a setting, it can be ensured as much as possible that the heat of the fuse 30 can exchange heat with the liquid cooling plate 10, thus ensuring the stable operation of the fuse 30.

[0052] In one embodiment, the housing 20 includes a cover plate 22 and a plurality of side plates 23. The plurality of side plates 23 are arranged around the periphery of the cover plate 22 along the circumferential direction of the cover plate 22. The liquid cooling plate 10, the plurality of side plates 23, and the cover plate 22 together enclose a first accommodation chamber 21.

[0053] In a second aspect, an embodiment of the present invention provides an electric vehicle, and the electric vehicle includes the above-mentioned battery pack.

[0054] Applying the technical solution of the present utility model, the fuse 30 is insulated from the liquid cooling plate 10, and at the same time, a heat conducting member 40 is provided between the fuse 30 and the liquid cooling plate 10. With such a setting, when the temperature rise at the fuse 30 is relatively high, the heat conducting member 40 can timely exchange heat between the heat at the fuse 30 and the liquid cooling plate 10, thereby being able to reduce the temperature at the fuse 30 and keep the fuse 30 at a normal operating temperature. This can not only ensure the normal operation of the fuse 30, but also avoid the influence of the relatively high temperature rise of the fuse 30 on the normal operation of the components around the fuse 30.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0056] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the protection scope of the present utility model; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0058] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0059] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0060] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: The battery pack comprises: Liquid cooling plate; A shell, which is covered on the liquid cooling plate, and a first accommodating cavity is formed between the shell and the liquid cooling plate; A fuse, located in the first accommodating cavity; A heat conducting member is arranged between the fuse and the liquid cooling plate, and the fuse and the liquid cooling plate perform heat exchange through the heat conducting member.

2. The battery pack according to claim 1, characterized in that: The heat conducting member comprises heat conducting gel.

3. The battery pack according to claim 1, characterized in that: The thermal conductivity of the heat conducting member is λ, 1.2W / m·K≤λ≤3W / m·K.

4. The battery pack according to claim 1, characterized in that: The battery pack also includes an insulating member, which is arranged in the first accommodating cavity and connected to the liquid cooling plate. The insulating member has a second accommodating cavity. The fuse has a connecting portion, which is fixed in the second accommodating cavity. The heat conductive member is filled at least between the connecting portion and the bottom wall of the second accommodating cavity.

5. The battery pack according to claim 4, characterized in that: The insulating member also includes a reinforcement structure, which is arranged in the second accommodating cavity and extends along the height direction of the insulating member. The reinforcement structure divides the second accommodating cavity into a first chamber, a second chamber and a third chamber. The connecting part is arranged in the first chamber and / or the third chamber.

6. The battery pack according to claim 4, characterized in that: The battery pack also includes a connector, which is arranged between the connecting portion and the bottom wall of the second accommodating cavity, one end of the connector is connected to the bottom wall of the second accommodating cavity, and the other end of the connector is connected to the connecting portion, so that the connecting portion and the bottom wall of the second accommodating cavity are spaced apart, and the heat conductive member at least fills the space between the connecting portion and the bottom wall of the second accommodating cavity.

7. The battery pack according to claim 5, characterized in that: The battery pack also includes a fixing member, which is arranged between the insulating member and the liquid cooling plate. A first fixing hole is arranged on the bottom wall of the second chamber. The fixing member has a second fixing hole arranged corresponding to the first fixing hole. The liquid cooling plate has a third fixing hole arranged corresponding to the first fixing hole. A fastener is sequentially inserted through the first fixing hole, the second fixing hole and the third fixing hole to fix the insulating member, the fixing member and the liquid cooling plate.

8. The battery pack according to claim 6, characterized in that: The battery pack further includes a connection row, one end of which is connected to the other end of the connector, one end of which is electrically connected to the connecting portion, and the other end of which is electrically connected to the components in the first accommodating cavity.

9. The battery pack according to claim 6, characterized in that: The heat conducting member covers the connecting portion.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The shell includes a cover plate and a plurality of side plates, wherein the plurality of side plates are arranged around the periphery of the cover plate along the circumference of the cover plate, and the liquid cooling plate, the plurality of side plates and the cover plate are jointly arranged to form the first accommodating cavity.

11. An electric vehicle, characterized in that: The electric vehicle comprises a battery pack as described in any one of claims 1-10.

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