CN220673190U - Upper cover - Google Patents

Abstract

The utility model provides an upper cover, which relates to the technical field of lithium batteries. The upper cover provided by the utility model has the advantages of low cost, small occupied space, no extra consumption of battery pack capacity, no increase of circuit and power supply design difficulty and the like.

Description

Upper cover

Technical Field

The utility model relates to the technical field of batteries, in particular to an upper cover.

Background

With the development and progress of new energy industry, the demand of products such as electric vehicles, energy storage systems and the like for batteries is increased, and the demands for battery use conditions (charge-discharge multiplying power, ambient temperature and the like) are also increased gradually. The temperature of electric devices in a high-voltage distribution box (BDU for short) can rise along with use, and under the condition of higher temperature, if the temperature of the electric devices cannot be effectively controlled, the problems of damage to the electric devices in the BDU, overlarge system temperature rise, high-temperature faults of the system, safety faults of the system and the like can be caused.

At present, the cooling mode of the BDU is mainly air cooling, however, the air cooling needs to be carried out on the BDU by installing a fan on the BDU, so that the BDU has the problems of increased cost, large occupied space, consumed battery pack capacity, complex circuit and power supply design and the like.

Disclosure of Invention

The utility model aims to provide an upper cover and a distribution box, which have the advantages of low cost, small occupied space, no extra consumption of battery pack capacity, no increase of circuit and power supply design difficulty and the like.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

in a first aspect, the present utility model provides an upper cover, including a heat-conducting cover body and a protruding portion protruding from an inner wall of the heat-conducting cover body, where the protruding portion is used for contacting with a top surface of each heat generating component to conduct heat of each heat generating component to the heat-conducting cover body, and an air convection channel is formed between a side wall of the protruding portion and the inner wall of the heat-conducting cover body.

Further, the protruding portion includes a plurality of protruding portions protruding in the same direction, and two arbitrary adjacent inter-protruding interval sections, each protruding portion includes the heat conduction face that is attached at least partially with each heating element's top surface respectively.

Further, the height of each of the convex bottom surfaces is configured based on the height of the top surface of the heat generating component corresponding thereto so that the convex bottom surfaces are in contact with the top surface of the heat generating component corresponding thereto;

the shape of each heat conducting surface is configured based on the shape of the top surface of the corresponding heat generating component so that the heat conducting surface is in complete fit contact with the top surface of the corresponding heat generating component, wherein the heat conducting surface comprises one or two of a plane and an arc surface.

Further, the heat conducting surface is concavely provided with an avoidance hole, and the avoidance hole is used for avoiding a fixing piece arranged on the top surface of the heating component corresponding to the avoidance hole.

Further, at least three air convection channels are arranged between each protruding side wall and the inner wall of the heat conducting cover body, and a plurality of heat dissipation parts are arranged on the protruding side walls along the height direction of the protruding side walls.

Further, the heat conduction cover body comprises a side wall surrounding the edge of the heat conduction cover body, a heat dissipation hole which is correspondingly communicated with the air convection channel is formed in the side wall, and the heat dissipation hole is an air inlet and outlet of the air convection channel.

Further, the heat conduction cover body and the protruding portion are integrally injection molded, the inner wall and the outer wall of the heat conduction cover body are both provided with heat conduction insulating layers, and the heat conduction cover body comprises heat conduction plastics and phase change materials.

In a second aspect, the present utility model further provides a distribution box, including a housing, the upper cover according to the above scheme, and a plurality of heat generating components disposed in the housing, where the upper cover is disposed on the housing, the protruding portion contacts with a top surface of each of the heat generating components, and materials of the housing include heat conductive plastics and phase change materials.

Further, the heating component comprises a heating element and an electric connecting piece connected with the heating element and at least partially positioned at the top of the heating element, and the protruding part is used for contacting with the heating element and/or the top of the electric connecting piece.

Further, the heat generating device further comprises a plurality of fixing columns protruding into the shell, and one side, away from the protruding portion, of the heat generating component is at least partially attached to the fixing columns in a fixed mode, so that heat of the heat generating component is conducted to the shell.

The upper cover and the distribution box provided by the utility model have the following beneficial effects:

in the upper cover provided by the utility model, the protruding part of the inner wall of the heat conduction cover body can be directly contacted with the top surface of each heating component, heat on the heating components is transferred to the heat conduction cover body, large-area heat dissipation is realized by the heat conduction cover body, and meanwhile, the protruding part and the periphery of the heating components can be dissipated through the air convection channel, and the two modes are matched together to reduce the temperature of the heating components.

Compared with the prior art, the top of the heating component generally comprises the copper bars, and a large amount of heat is generated in the process of conveying current through the copper bars, so that the heat is concentrated at the top of the heating component.

Compared with the prior art, the distribution box provided by the second aspect of the utility model adopts a targeted contact heat conduction mode and a natural ventilation heat conduction mode to realize heat dissipation of the heating component. The traditional heat dissipation mode of adding fans is eliminated, the production cost of the distribution box can be reduced, the occupied area of the distribution box is reduced, the battery pack electric quantity is not required to be additionally consumed, an additional design circuit and a power supply are not required, and the overall energy consumption and the cost of the battery pack are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic three-dimensional structure of an upper cover under a first view angle according to an embodiment of the present utility model;

fig. 2 is a schematic three-dimensional structure diagram of an upper cover under a second view angle according to an embodiment of the present utility model;

fig. 3 is a schematic diagram showing a three-dimensional structure of an upper cover under a second view angle according to an embodiment of the present utility model;

fig. 4 is a schematic three-dimensional structure of a distribution box according to an embodiment of the present utility model;

fig. 5 is an exploded view of a distribution box according to an embodiment of the present utility model.

Icon: 1-a heat conduction cover body; 11-heat dissipation holes; 2-a protrusion; 21-a bump; 211-avoiding holes; 3-an air convection channel; 4-a housing; a 5-fuse; 6-a main positive relay; 7-a main negative relay; 8-electrical connectors; 9-fixing the column.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

An embodiment of the first aspect of the present utility model is to provide an upper cover, as shown in fig. 1 and 2, including a heat conducting cover body 1 and a protruding portion 2 protruding from an inner wall of the heat conducting cover body 1, where the protruding portion 2 is used for contacting with a top surface of each heat generating component to conduct heat of each heat generating component to the heat conducting cover body 1, and an air convection channel 3 is formed between a side wall of the protruding portion 2 and the inner wall of the heat conducting cover body 1.

The upper cover that above-mentioned embodiment provided is different from traditional block terminal lid, and the roof of traditional block terminal lid is usually designed to the constant thickness, and the roof is a plane corresponding to the inner wall of heating element top surface, and the block terminal lid only plays the effect of protection to the inside components and parts of block terminal, mainly adopts the forced air cooling mode to dispel the heat, need install the fan in the block terminal in addition and cool down the processing to the block terminal, leads to the cost increase of block terminal, and is bulky, needs the electric quantity that consumes the battery package simultaneously, leads to the circuit complicacy.

The upper cover provided in the above embodiment gets rid of the design mode that the inner wall of the top wall of the traditional distribution box cover is a plane, as shown in fig. 2, the inner wall of the heat conduction cover 1 is provided with the protruding part 2 for contacting with the top surface of each heating component, the protruding part 2 can conduct at least part of heat of each heating component to the heat conduction cover 1, heat is dissipated through the heat conduction cover 1, meanwhile, an air convection channel 3 is formed between the side wall of the protruding part 2 and the inner wall of the heat conduction cover 1, heat is dissipated to the protruding part 2 and the periphery of the heating component through the air convection channel 3, and the two modes cooperate together to reduce the temperature of the heating component. The electric fan is not required to be additionally arranged, and the electric fan has the advantages of low cost, small occupied space, no additional consumption of battery pack capacity, no increase of circuit and power supply design difficulty and the like.

The structure of the projection 2 is specifically described below:

the protruding part 2 may be a whole protruding structure, and the protruding structure contacts with the top surface of each heating component at the same time, specifically, a protruding part 2 may be protruding downwards on the inner wall of the heat conducting cover 1, and the protruding part 2 may be spaced from three or four side walls of the heat conducting cover 1, so as to form an air convection channel 3, so as to realize heat conduction and heat dissipation; in an alternative embodiment, as shown in fig. 2, the protruding portion 2 may also include a plurality of protrusions 21, where each protrusion 21 corresponds to at least one group of heat generating components, so as to conduct heat of the corresponding heat generating components to the heat conducting cover 1, thereby reducing weight and cost of the protruding portion 2 and improving heat dissipation effect.

Taking fig. 2 as an example for specific illustration, the protruding portion 2 includes a plurality of protrusions 21 protruding from an inner wall of the heat conducting cover 1, the protrusions 21 are all arranged downward, each protrusion 21 includes a heat conducting surface, the heat conducting surface on each protrusion 21 corresponds to at least one heat generating component, and the heat conducting surface can be at least partially attached to a top surface of the corresponding heat generating component.

Above-mentioned bulge 2 is including a plurality of archs 21, and every arch 21 can be targeted dispel the heat to each heating element, and each arch 21 independently sets up, and the lateral wall of each arch 21 of being convenient for dispel the heat through air convection channel 3, and the radiating effect is better. The number of the protrusions 21 may be set according to the heat dissipation requirement of the heat generating component, thereby reducing the overall cost and weight.

In at least one embodiment, the heat conducting surface on each protrusion 21 corresponds to a heat generating component, which is convenient for the design of the upper cover and the heat dissipation of the heat generating component.

In some embodiments, the space between any two adjacent protrusions 21 is divided, and the air convection channels 3 can be formed between the spaces, and the air convection channels 3 can also be formed between the side walls of the protrusions 21 and the inner wall of the heat conducting cover body 1, so that the heat dissipation effect is improved through a plurality of air convection channels 3. And, the air convection channels 3 between the protrusions 21 and the air convection channels 3 between the side walls of the protrusions 21 and the inner wall of the heat conducting cover body 1 have different flow directions, so that the air convection heat dissipation efficiency can be further improved.

In some embodiments, to increase the efficiency of heat dissipation of the protrusions 21 by air convection, at least three air convection channels 3 are provided between the side wall of each protrusion 21 and the inner wall of the heat conducting cover 1.

It will be appreciated that the "side wall" mentioned above refers to the side wall of the protrusion 21 or bulge 2 around the outside of the bottom wall facing the heat generating component and the top wall facing away from the heat generating component.

As shown in fig. 3, it is assumed that the protrusion 21 has four sidewalls surrounded in a cylindrical shape, wherein one of the sidewalls is fixedly connected with the inner wall of the heat conductive cover 1 to improve stability of the protrusion 21, and an air convection channel 3 is provided between each of the other three sidewalls and the inner wall of the heat conductive cover 1, the three air convection channels 3 radiate heat from the sidewalls of the protrusion 21 together, and air flow directions in at least two air convection channels 3 of the three air convection channels 3 are different, that is, have at least two flow directions in different directions, thereby improving heat radiation efficiency.

The number of the air convection passages 3 provided between the side wall of the protrusion 21 and the inner wall of the heat conductive cover 1 is different depending on the shape of the protrusion 21 and the connection position with the heat conductive cover 1. Assuming that the top wall of the protrusion 21 is fixedly connected with the inner wall of the heat conducting cover body 1, four side walls of the protrusion 21 are arranged at intervals with the inner wall of the heat conducting cover body 1, four air convection channels 3 are arranged between the side walls of the protrusion 21 and the inner wall of the heat conducting cover body 1, the number of the air convection channels 3 is increased, the heat dissipation efficiency can be directly improved, and meanwhile, the four air convection channels 3 have two flow directions in different directions, so that the heat dissipation efficiency is further improved.

In an alternative embodiment, the side wall of the protrusion 21 or the protruding portion 2 may be provided with a heat dissipating portion (not shown), and the heat dissipating portion may be continuously or intermittently protruded in the height direction of the side wall, so as to further improve the heat dissipating effect, and the shape of the heat dissipating portion may be zigzag, wavy, rectangular, etc.

When the protrusion 2 includes a plurality of protrusions 21 protruding from the inner wall of the heat conductive cover 1, in some embodiments, the height of the bottom surface of each protrusion 21 is configured based on the height of the top surface of the corresponding heat generating component, that is, the bottom surface of each protrusion 21 is in height with the top surface of the corresponding heat generating component, so that the bottom surface of the protrusion 21 contacts the top surface of the corresponding heat generating component, and the heat of the heat generating component is stably and effectively transferred to the heat conductive cover 1. Since the height of each heat generating component may be different, the height of the protrusion 21 is configured in a targeted manner according to the difference of the heat generating components, thereby ensuring the heat dissipation effect of the heat generating components.

Specifically, in order to increase the contact area between the protrusions 21 and the corresponding heat generating components, the shape of the heat conducting surface on each protrusion 21 is configured based on the shape of the top surface of the corresponding heat generating component, so that the heat conducting surface is in complete fitting contact with the top surface of the corresponding heat generating component, and the heat generating components are efficiently radiated, and meanwhile, the fixing and protecting functions of the heat generating components can be achieved, the heat generating components are abutted against the heat conducting surface of the protrusion 21, and the stability of the heat generating components in the height direction is ensured while heat is transferred.

The heat conducting surface may include one or two of a plane and an arc surface according to different shapes of the top surface of the heating component.

Of course, the shape of the heat conducting surface is not limited to the above, and the shape of the heat conducting surface is only required to be matched with the shape of the top surface of the corresponding heating component.

In some embodiments, when the top surface of the heating element has fixing members such as bolts, as shown in fig. 2, the heat conducting surface corresponding to the heating element may be concavely provided with an avoiding hole 211, and the avoiding hole 211 avoids the protruding fixing member, so as to ensure the complete fit between the top surface of the heating element and the bottom surface of the protrusion 21, and ensure smooth installation of the upper cover.

The structure of the heat conductive cover 1 is specifically described below:

in some embodiments, as shown in fig. 1 and fig. 2, the heat-conducting cover 1 includes a side wall surrounding the edge, the side wall is provided with a heat dissipation hole 11 correspondingly communicated with the air convection channel 3, the heat dissipation hole 11 is an air inlet and outlet of the air convection channel 3, the heat dissipation hole 11 can extend along the length direction of the side wall, the size of the heat dissipation hole 11 is enlarged, and good circulation of air is ensured. In order to improve the strength of the side wall and to ensure the heat dissipation effect, the heat dissipation holes 11 may be disposed on the side wall of the heat conductive cover 1 at intervals in the horizontal direction or the vertical direction.

It should be noted that, the heat dissipation hole 11 structurally performs a corresponding avoiding design according to the protrusion 21 and other parts inside the heat conduction cover body 1, and does not affect the protrusion and other parts.

In at least one embodiment, the heat-conducting cover 1 includes four side walls, each side wall is provided with a heat dissipation hole 11, and the heat dissipation holes 11 oppositely arranged form heat convection. The heat dissipation holes 11 may be in a strip shape, and a plurality of heat dissipation holes 11 may be distributed on each side wall from top to bottom at intervals.

In some embodiments, the heat-conducting cover 1 and the protruding portion 2 are integrally injection molded, so that the heat-conducting cover 1 and the protruding portion 2 integrally form a heat-absorbing and heat-conducting structure, and the heat dissipation effect is ensured.

In some embodiments, the inner wall and the outer wall of the heat conduction cover body 1 are provided with heat conduction insulating layers, so that normal operation of the distribution box is ensured.

The insulating material of the thermal insulating layer can be high-temperature enamel, alumina, pure acrylic emulsion and the like, and the thickness of the thermal insulating layer can be designed according to the needs (preferably 0.5 mm), so that the thermal insulating layer not only ensures the insulating performance, but also meets the excellent characteristics of heat conduction, high temperature resistance and the like of the material.

An embodiment of the second aspect of the present utility model is to provide a power distribution box, as shown in fig. 4 and 5, where the power distribution box includes a housing 4, the upper cover and a plurality of heat generating components disposed in the housing, the upper cover is disposed on the housing 4, and the protruding portion 2 contacts with a top surface of each heat generating component.

Compared with the prior art, the power distribution box provided by the embodiment of the second aspect of the utility model does not need to be provided with a fan, realizes heat dissipation of the heating component in a targeted contact heat conduction and natural ventilation heat conduction mode, reduces the production cost of the power distribution box, reduces the occupied area of the power distribution box, does not need to consume extra battery pack capacity, and simplifies the circuit design.

The heating element is specifically described below:

in some embodiments, as shown in fig. 5, the heat generating component includes a heat generating element and an electrical connection element 8 connected with the heat generating element and at least partially located on top of the heat generating element, where the heat generating element may include a fuse 5, a main positive relay 6, a main negative relay 7, and the like, and the electrical connection element 8 may be a copper bar.

Because the electric connecting piece 8 is located at the top of the heating element, the temperature of the top of the heating element is higher than that of the bottom, and the protruding part 2 can be in contact with the top of the heating element or the electric connecting piece 8 or in contact with the top of the heating element and the electric connecting piece 8, so that the heating element can be quickly and pertinently cooled.

Taking fig. 5 as an example for specific illustration, two electrical connectors 8 are connected to the top of the main negative relay 7, and each electrical connector 8 can respectively contact and dissipate heat with two protrusions 21 in the protruding portion 2; the top of the main positive relay 6 is connected with two electric connecting pieces 8, and each electric connecting piece 8 can be respectively contacted with and dissipate heat from the other two bulges 21 in the bulge part 2; two electric connectors (one of which belongs to the same electric connector 8 installed on the main negative relay 7) are connected to two sides of the fuse 5, the arc top wall of the fuse 5 and one protrusion 21 in the protruding part 2 are in contact heat dissipation, at this time, the heat conducting surface of the protrusion 21 comprises a concave arc surface for accommodating the arc top wall and a plane for contacting the electric connector 8, so that the heat conducting surface is in complete fit contact with the fuse 5 and the electric connector 8 thereof, and the fuse 5 and the electric connector 8 can be fixed through the heat conducting surface.

In some embodiments, as shown in fig. 5, the distribution box may further include a plurality of fixing columns 9 protruding into the housing 4, where a side of the heat generating component away from the protruding portion 2 is at least partially fixedly attached to the fixing columns 9, so as to conduct heat of the heat generating component to the housing 4, and achieve bidirectional heat dissipation between the upper cover and the housing 4. The fixing column 9 not only can play a role in supporting the heating component, but also can realize heat conduction and heat dissipation at the other end of the heating component, which is in contact with the bulge 21, so that the heat dissipation effect is further improved.

Further, the electrical connector 8 may be connected to the fixing post 9 by a bolt (not shown in the drawings), and the bolt may be received in the avoidance hole 211, so as to ensure the fitting arrangement of the electrical connector 8 on the protrusion 21.

It should be noted that, the upper cover and the housing 4 may be made of a material with good heat conducting property, so as to improve the overall heat dissipation effect.

In some embodiments, the materials of the upper cover and the housing 4 can be mixed by heat conducting plastics and phase change materials according to a certain proportion, and the materials can meet the requirements of insulation, structural strength and the like after being compounded.

In at least one embodiment, the material of the upper cover and the housing 4 is HDPE (HighDensity Polyethylene ), hdpe+filler (graphite) +phase change material (paraffin) to form a composite, wherein the ratio can be according to 27:3:10, preparing a material sheet by a melt blending method, and preparing a finished product by a thermoforming method, wherein the material mainly has the effects of timely guiding out heat absorbed by a shell, reducing the temperature of the shell of the distribution box, and the phase-change material mainly absorbs the heat generated by a heating component in the distribution box during operation, and the heat-conducting plastic can timely conduct out the heat absorbed by the phase-change material, so that the temperature rise of the heating component is reduced, the filler can improve the comprehensive performance of the material, and the integral insulation performance and strength requirements of the material are ensured.

On this basis, set up insulating layer at upper cover and shell 4, can spray coating inside and outside upper cover and shell, realize the secondary insulation protection, guarantee to insulate completely between upper cover and shell and the inside electric device, improve the whole security of block terminal, in addition, in order to reduce cost, only upper cover selects heat conduction plastics and phase change material, perhaps only the shell selects heat conduction plastics and phase change material.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (7)

1. The utility model provides an upper cover, its characterized in that includes heat conduction lid (1) and protruding locate bulge (2) of heat conduction lid (1) inner wall, bulge (2) are used for with each heating element's top surface contact, with each heating element's heat conduction extremely heat conduction lid (1), bulge (2) lateral wall with be formed with air convection channel (3) between the inner wall of heat conduction lid (1).

2. Upper cover according to claim 1, characterized in that the projection (2) comprises a plurality of projections (21) projecting in the same direction, the spacing between any two adjacent projections (21) being divided, each projection (21) comprising a heat conducting surface at least partly abutting the top surface of each heat generating component.

3. The upper cover according to claim 2, wherein the height of the bottom surface of each of the protrusions (21) is configured based on the height of the top surface of the heat generating component corresponding thereto so that the bottom surface of the protrusion (21) is in contact with the top surface of the heat generating component corresponding thereto;

the shape of each heat conducting surface is configured based on the shape of the top surface of the corresponding heat generating component so that the heat conducting surface is in complete fit contact with the top surface of the corresponding heat generating component, wherein the heat conducting surface comprises one or two of a plane and an arc surface.

4. The upper cover according to claim 2, wherein the heat conducting surface is concavely provided with an avoidance hole (211), and the avoidance hole (211) is used for avoiding a fixing piece arranged on the top surface of the corresponding heating component.

5. Upper cover according to claim 2, characterized in that at least three air convection channels (3) are provided between the side wall of each protrusion (21) and the inner wall of the heat conducting cover body (1), wherein the side wall of the protrusion (21) is provided with a plurality of heat dissipation parts along the height direction thereof.

6. The upper cover according to any one of claims 1 to 5, wherein the heat conducting cover body (1) comprises a side wall surrounding the edge of the heat conducting cover body, the side wall is provided with a heat dissipation hole (11) correspondingly communicated with the air convection channel (3), and the heat dissipation hole (11) is an air inlet and outlet of the air convection channel (3).

7. Upper cover according to any one of claims 1-5, characterized in that the heat conducting cover body (1) and the protruding part (2) are integrally injection molded, and that both the inner wall and the outer wall of the heat conducting cover body (1) are provided with heat conducting and insulating layers.