CN220672768U - Battery pack and energy storage device - Google Patents

Abstract

The application provides a battery pack and an energy storage device. The battery pack comprises a battery module, a heat dissipation shell and a power circuit board, wherein the power circuit board comprises a first device and a second device which are arranged on a substrate and protrude to different heights relative to the first surface of the substrate, the heat dissipation shell comprises a first inner wall and a second inner wall, the distance between the first surface and the first inner wall is different from the distance between the first surface and the second inner wall, a gap is formed between the first inner wall and the first device, and a gap is formed between the second inner wall and the second device. The battery pack provided by the application has the advantages of small occupied space and good heat dissipation effect.

Description

Battery pack and energy storage device

Technical Field

The application relates to the technical field of energy storage, in particular to a battery pack and an energy storage device.

Background

The battery pack generally includes a battery module and power electronics. The electronic power component is used for carrying out interaction and control of electric signals and communication signals between the electronic power component and the battery module, and comprises a power circuit board, wherein a power device is arranged on the power circuit board, and the electronic power side component can generate heat under the working state and needs to dissipate heat so as to ensure the normal working and the service life of the battery pack.

The energy storage device includes one or more battery packs, the overall size of which affects the footprint of the energy storage device. For household energy storage devices, space saving, small size designs are particularly important.

The heat dissipation structure of the battery pack affects the performance and overall size of the battery pack, as well as the footprint of the consumer energy storage device.

How to realize the heat dissipation design scheme of a battery pack has the advantages of small occupied space and good heat dissipation effect, and is a direction of research and development in the industry.

Disclosure of Invention

The embodiment of the application provides a battery pack and an energy storage device with small occupied space and good heat dissipation effect.

In a first aspect, the present application provides a battery pack, where the battery pack includes a battery module, a heat dissipation case, and a power circuit board, where the heat dissipation case is arranged in parallel with the battery module, the heat dissipation case is connected with the battery module, and the power circuit board is located in the heat dissipation case; the power circuit board comprises a substrate, a first device and a second device, wherein the substrate comprises a first surface and a second surface which are arranged in opposite directions, the second surface faces the battery module, the first device and the second device are arranged on the first surface in a protruding mode, and the protruding heights of the first device and the second device are different relative to the protruding heights of the first surface; the heat dissipation case member includes a case, a first inner wall and a second inner wall, the case and the first surface being disposed opposite to each other, the first inner wall and the second inner wall facing the first surface in an arrangement direction of the heat dissipation case member and the battery module, a distance between the first surface and the first inner wall being different from a distance between the second surface and the second inner wall, in other words, a distance between the first inner wall and the case being different from a distance between the second inner wall and the case, i.e., the inner wall of the case includes a plurality of concave-convex structures, the plurality of concave-convex structures and the first surface being disposed opposite to each other and being matched with the first device and the second device; thus, a gap exists between the first inner wall and the first device, and a gap exists between the second inner wall and the second device.

According to the battery pack provided by the embodiment of the application, the first device and the second device on the power circuit board are respectively radiated through the first inner wall and the second inner wall of the radiating shell, the first device and the second device are different in height from the first surface of the substrate, accordingly, the distance between the first surface and the first inner wall is different from the distance between the first surface and the second inner wall, certain gaps can be reserved between the first device and the first inner wall and between the second device and the second inner wall, the first device and the first inner wall are provided, the second device and the second inner wall can be used for conducting heat transmission through the gaps, for example, the gaps can contain heat conducting media, so that the radiating shell and the first device and the second device on the power circuit board can be better in heat conducting connection, and the better radiating performance can be realized through the light and thin miniaturized radiating shell. Therefore, the heat dissipation efficiency of the battery pack can be improved, and the design of miniaturization of the battery pack is facilitated.

In a possible implementation manner, the thickness of the heat conducting medium between the first inner wall and the first device is the same as the thickness of the heat conducting medium between the second inner wall and the second device, and the thickness of the heat conducting medium is the dimension of the heat conducting medium in the arrangement direction of the heat dissipation case member and the battery module. According to the scheme, the thickness of the heat conducting medium between the first inner wall and the first device is limited to be the same as the thickness of the heat conducting medium between the second inner wall and the second device, so that the position design of the first inner wall and the second inner wall of the heat radiating shell piece is more accurate, and the size of the heat conducting medium and the position relation between the heat radiating shell piece and the power circuit board are easy to control in the assembling process of the battery pack.

In a possible implementation manner, the power circuit board includes a third device, the third device is disposed on the second surface, the heat dissipation shell includes a first boss, the first boss and the third device are disposed opposite to each other, and a gap exists between a position on the first surface corresponding to the third device and the first boss. The third device in this scheme is through the first boss of heat dissipation shell spare and first boss with gap between the first surface is derived heat, realizes carrying out heat conduction to the third device of establishing at the second surface, can promote the holistic radiating efficiency of power circuit board.

In a possible implementation manner, the substrate is provided with a heat dissipation through hole, the heat dissipation through hole is located around the third device and penetrates through the first surface and the second surface, and the heat dissipation through hole is located in a projection area of the first boss on the substrate. This scheme is through setting up the heat dissipation through-hole, and the heat dissipation through-hole can realize the circulation of air between the space of second surface one side and the space of first surface one side, and the heat under the third device operating condition can be along the heat dissipation through-hole conduction to one side of first surface, and this scheme can have promoted the heat conduction efficiency of first boss to the third device.

In a possible implementation manner, the power circuit board includes a first control board, the first control board is vertically disposed on the first surface, a first baffle and a second baffle are disposed on the inner surface of the heat dissipation shell in a protruding manner, a containing space is formed between the first baffle and the second baffle, and the first control board is located in the containing space. According to the scheme, the first baffle and the second baffle are arranged on two sides of the first control board, so that thermal isolation is formed between the space where the first control board is located and other spaces on the power circuit board, the working temperature of the first control board can be protected to be lower, and the heat of the power heating device on the power circuit board is prevented from affecting the normal operation of the first control board.

In a possible implementation manner, the first baffle is in a flat plate shape, at least part of the second baffle is bent and extended, the second baffle comprises a first part, a second part and a connecting part, the distance between the first part and the first baffle is smaller than the distance between the second part and the first baffle, the connecting part is connected between the first part and the second part, and the surface of the first control board facing the second baffle is provided with electronic devices with different sizes. This scheme has restricted the specific structural morphology of first baffle and second baffle, through the part second baffle of buckling the extension, can match the different electronic device of size on the first control panel, and this scheme is favorable to practicing thrift the occupation board area of first baffle and second baffle on power circuit board, is favorable to the miniaturized design of battery package.

In a possible implementation manner, the heat dissipation shell comprises a bottom wall and a plurality of side walls encircling and connected with the edge of the bottom wall, the side walls are sequentially connected and jointly enclose an accommodating space with the bottom wall, the power circuit board is located in the accommodating space, the bottom wall and the substrate are oppositely arranged, and the first inner wall and the second inner wall are all partial areas of the bottom wall. According to the scheme, the power circuit board is arranged in the accommodating space, the power circuit board is accommodated by utilizing the inner space of the heat dissipation shell, and the heat dissipation shell surrounds the power circuit board in multiple directions, so that the heat dissipation efficiency is high, and the overall miniaturization design of the battery pack is facilitated.

In a possible implementation manner, the outer surfaces of the ends of the side walls, which are far away from the bottom wall, are provided with fixing belts in a protruding mode, and the fixing belts are fixedly connected with the battery module. The scheme provides a specific fixed connection scheme under the condition of ensuring heat dissipation efficiency. Specifically, the battery module is connected through the fixed band of the heat dissipation shell, the heat dissipation shell and the battery module are assembled into a whole, and the power circuit board is positioned in the inner space of the heat dissipation shell.

In a possible implementation manner, the two oppositely arranged side walls of the plurality of side walls are a first side wall and a second side wall, the fixing strap is located at outer edges of one ends of the first side wall and the second side wall, which are far away from the bottom wall, the other two oppositely arranged side walls of the plurality of side walls are a third side wall and a fourth side wall, the third side wall is connected between the first side wall and the second side wall, the fourth side wall is also connected between the first side wall and the second side wall, the third side wall comprises a first plug-in connection portion, the fourth side wall comprises a second plug-in connection portion, and the first plug-in connection portion is in a structure shape capable of being mutually plug-in matched with the second plug-in connection portion. According to the scheme, the first plug-in part is arranged on the third side wall, the second plug-in part is arranged on the fourth side wall, and the stacking connection between the adjacent battery packs can be realized through the mutual plug-in cooperation between the first plug-in part and the second plug-in part, so that the stacking connection between the plurality of battery packs is facilitated, and the compact-size miniaturized energy storage device is formed.

In a possible implementation manner, a first accommodating cavity is formed in the first plugging portion, a second accommodating cavity is formed in the second plugging portion, the battery pack further comprises a first connector and a second connector, the first connector is fixed in the first accommodating cavity, the second connector is fixed in the second accommodating cavity, the first connector can be electrically connected with the second connector through plugging fit, and the first connector and the second connector are electrically connected with the power circuit board. This scheme is through setting up first connector in first holding the chamber, and set up the second connector in the second holds the chamber, through first, second connector and power circuit board are connected, can realize the electric connection of the control unit in battery package and the energy memory, and this scheme provides the design of the wiring of realizing electric connection in the inside heat dissipation shell spare, makes energy memory overall structure can be compacter, is favorable to its miniaturized design of size.

In one possible implementation manner, the bottom wall, the first side wall and the second side wall are all provided with heat dissipation fins, and the third side wall and the fourth side wall are used for being in butt joint with the heat dissipation shell in the adjacent battery pack. According to the scheme, through the limitation of the specific positions of the radiating fins (arranged on the bottom wall, the first side wall and the second side wall), the radiating effect of the radiating shell can be improved, the third side wall and the fourth side wall are used for connecting adjacent radiating shells, and the connection compactness between the radiating shells of adjacent battery packs can be achieved.

In a possible implementation manner, the heat dissipation shell includes a plurality of mounting posts, the mounting posts are located in the accommodating space and connected to the bottom wall, and the substrate is fixedly connected to the mounting posts. The scheme provides a specific installation mode of the power circuit board in the heat dissipation shell.

In a possible implementation manner, the battery pack further includes a partition plate connected to the heat dissipation case and located in the receiving space, and the partition plate is located between the second surface and the battery module. The partition plate is used for heat insulation, and particularly, the heat generated by partial devices of the power circuit board during working is large, and due to the blocking effect of the partition plate, the heat transfer between the power circuit board and the battery module is reduced, so that the influence of the heat generated by the power circuit board on the battery module is reduced, the possibility of valve opening and thermal runaway faults of the battery module is also reduced, and the service life of the battery module is prolonged. The partition plate can also reduce heat conduction from the battery module to the power circuit board, so that the generation of condensation phenomenon of the power circuit board can be reduced, and adverse effects of the condensation phenomenon on the power circuit board are reduced.

In one possible implementation manner, the heat dissipation shell and the battery module are connected in a sealing manner. The scheme is beneficial to protecting the power circuit board from being influenced by moisture, dust and the like in the space through the sealing connection between the heat dissipation shell and the battery module.

In a second aspect, the present application provides an energy storage device, including a plurality of battery packs provided in any one of the possible implementation manners of the first aspect, where a plurality of the battery packs are stacked.

In a third aspect, the present application provides an energy storage device, including a control unit and a battery pack according to an embodiment of the first aspect, a plurality of battery packs are stacked and arranged, the first connectors of the battery packs are electrically connected with the second connectors of the adjacent battery packs, the control unit is stacked and arranged at the top of the plurality of battery packs, the control unit is provided with a plug-in port and a control joint, the plug-in port and the first plug-in portion in the battery pack adjacent to the control unit are plugged with each other, the control joint is located in the plug-in port, and the control joint and the first connectors in the battery pack adjacent to the control unit are electrically connected.

In a fourth aspect, the present application provides an energy storage system comprising a load and the energy storage device of the second or third aspect, the energy storage device being for powering the load.

In a fifth aspect, the present application provides a photovoltaic system, including an electrical energy conversion device, a load, and an energy storage device according to the second or third aspect, the electrical energy conversion device being configured to convert solar energy into electrical energy, the energy storage device being electrically connected to the electrical energy conversion device, the energy storage device being configured to store electrical energy and to supply power to the load.

Drawings

FIG. 1 shows a schematic frame structure of a photovoltaic system;

fig. 2 is a household energy storage scene diagram of an energy storage device according to an embodiment of the present disclosure;

fig. 3 is an application scenario diagram of an energy storage device according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of an energy storage device according to an embodiment of the present disclosure;

fig. 5 is an exploded perspective view of a battery pack according to an embodiment of the present application;

FIG. 6 is a partially exploded schematic illustration of a battery pack provided in an embodiment of the present application;

fig. 7 is a schematic perspective view of a battery pack according to an embodiment of the present disclosure;

fig. 8 and 9 are schematic diagrams of two directions of a power circuit board according to an embodiment of the present application;

Fig. 10 is a schematic cross-sectional view of a power circuit board according to an embodiment of the present disclosure;

FIG. 11 is a schematic perspective view of a heat dissipation shell according to one embodiment of the present disclosure;

FIG. 12 is a schematic perspective view of a heat dissipating shell according to another embodiment of the present disclosure;

FIG. 13 is a schematic illustration of a stacked connection of two heat dissipating shells;

FIG. 14 is a schematic view of a first connector and a second connector provided in one embodiment of the present application;

FIG. 15 is a schematic view of a first connector according to one embodiment of the present application;

FIG. 16 is a schematic view of a second connector mounted in a second receiving cavity of a second mating portion;

FIG. 17 is a schematic view of the first connector mounted in the first receiving cavity of the first mating portion;

FIG. 18 is a perspective view of the power circuit board and the splitter plate assembled within the heat dissipation housing and forming a unitary structure;

FIG. 19 is a cross-sectional view of the P1-P1 position shown in FIG. 18;

FIG. 20 is a cross-sectional view of the P2-P2 position shown in FIG. 18;

FIG. 21A is a schematic cross-sectional view of a heat dissipating housing and a power circuit board;

FIG. 21B is a schematic cross-sectional view of a heat dissipating housing and a power circuit board;

FIG. 22 is a schematic diagram of an energy storage device according to an embodiment of the present disclosure;

Fig. 23 is a schematic view of a base of the energy storage device shown in fig. 22.

Detailed Description

The basic concepts involved in the embodiments of the present application are described below.

The energy storage device is a device for converting chemical energy stored in the energy storage device into electric energy, namely, a device for converting pre-stored energy into external electric energy.

Household energy storage, also known as home storage, is an important component of Distributed Energy (DER). The distributed energy supply can save the power transmission and distribution cost, lower the cost and improve the electric energy quality and the energy efficiency. For families, the power consumption cost can be reduced by improving the spontaneous proportion, participating in auxiliary service and the like, and meanwhile, the power consumption cost is used as an emergency standby power supply when the middle end of the power grid is caused by factors such as major disasters and the like, so that the reliability of power supply of the families is improved; for the power grid, the VRE (fluctuating renewable energy) duty ratio is rapidly increased, the difference between the power generation curve and the power utilization curve is further increased, and the energy storage is configured to transfer the power in time to assist the power grid in balancing the power generation capacity and the power utilization requirement.

The energy storage device provided by the embodiment of the application can be applied to a network household optical storage system or an off-network household optical storage system. The grid-connected household optical storage system can supply power to a household load by a power grid or transmit power to the power grid by the household optical storage system, and the off-grid household energy storage system is not electrically connected with the power grid, so that the system is suitable for remote power grid-free areas such as islands. The energy storage device provided by the embodiment of the application can be applied to photovoltaic systems, wind power systems and other systems.

As is well known, to achieve the great goal of carbon neutralization, the main approach to green electric energy generation is to develop green energy sources such as photovoltaic and wind power. The problems of strong intermittence, large fluctuation and the like of wind energy, solar energy and the like generally exist, and the problems of unstable power grid, insufficient peak electricity consumption, too much low electricity consumption and the like can be caused. To solve these problems, it is necessary to rely on an energy storage device to convert electric energy into other forms of energy by physical or chemical means and store the energy, and to release the energy when needed, the energy storage device is simply similar to a large-scale "charge pal", and when the photovoltaic and wind energy are sufficient, stores the electric energy, and releases the stored electric power when needed.

The possible embodiments of the present application are described below with reference to the accompanying drawings in the possible embodiments of the present application.

Fig. 1 shows a schematic frame of a photovoltaic system, as shown in fig. 1, comprising a photovoltaic array 110, a power converter 120, an energy storage device 150, and an electrical grid 130/external load 140. The power converter 120 may integrate a DC/DC conversion circuit and a DC/AC conversion circuit, the energy storage device 150 may be located between the DC/DC conversion circuit and the DC/AC conversion circuit, and the energy storage device 150 may be charged after the electric energy generated by the photovoltaic array 110 is subjected to voltage boosting or voltage reducing conversion by the DC/DC conversion circuit. When the electrical energy generated by the photovoltaic array 110 is insufficient to power the grid 130/external load 140, the electrical energy stored in the energy storage device 150 may be transferred to the grid 130/external load 140 via the DC/AC conversion circuit within the power converter 120. On the other hand, the energy storage device 150 may also receive power from the power grid 130, where the AC power output by the power grid 130 is converted into DC power by the DC/AC conversion circuit and then transferred to the energy storage device 150, so as to charge the energy storage device 150. Alternatively, the power converter 120 includes only a DC/AC conversion circuit, and the energy storage device 150 has a built-in DC/DC conversion circuit, and directly receives the direct current power generated by the photovoltaic array 110.

Fig. 2 is a household energy storage scene diagram of the energy storage device 100 according to the embodiment of the present application. In this embodiment, a household energy storage scenario in user side energy storage is taken as an example for explanation, and referring to fig. 2, an energy storage system is provided in this embodiment, and the energy storage system may be a household energy storage system, and the energy storage system may also be a photovoltaic system. The energy storage system of the embodiment of the present application includes an electrical energy conversion device 200, an energy storage device 100, a first load 1 (for example, but not limited to, electrical equipment in a power grid such as a street lamp, etc.), a second load 2 (for example, but not limited to, a household appliance), a third load 3, etc. (for example, but not limited to, a terminal device). The power conversion device 200 is a solar photovoltaic panel. The energy storage device 100 may be placed directly on the floor of the room or the outside, or may be mounted on a wall of the room or the outside by hanging. Specifically, the power conversion device 200 may convert solar energy into electric energy during the low electricity price period, and the energy storage device 100 is configured to store the electric energy and supply the electric energy to the first load 1, the second load 2, the third load 3, etc. for use during the peak electricity price period, or supply the electric power to the first load 1, the second load 2, the third load 3, etc. during the power grid outage/outage.

Fig. 3 is an application scenario diagram of the energy storage device 100 according to the embodiment of the present application. Referring to fig. 3, in the present embodiment, the energy storage system may only include the energy storage device 100 and the user load (not including the power conversion device), the energy storage device 100 directly supplies power to the user load, and the charging device may be used to charge when the power of the energy storage device 100 is insufficient.

Fig. 4 is a schematic diagram of an energy storage device 100 according to an embodiment of the present disclosure. Referring to fig. 4, the energy storage device 100 includes a battery pack 1001, a control unit 1002, and a base 1003. The number of the battery packs 1001 may be at least two, and at least two battery packs 1001 are sequentially stacked between the base 1003 and the control unit 1002. The base 1003 is used to support the battery pack 1001. The control unit 1002 is located at the top of the battery pack 1001. The control unit 1002 is used for electrical connection of the battery pack 1001, for example, for controlling charge, discharge, or use conditions of the battery pack 1001, and the like. The control unit 1002 is configured to be electrically connected to a battery conversion device and/or a load.

Fig. 5 is an exploded perspective view of a battery pack according to an embodiment of the present application. Fig. 6 is a partially exploded view of a battery pack according to an embodiment of the present application. Referring to fig. 5 and 6, a battery pack 1001 includes a battery module 10, a heat dissipation case 20, a power circuit board 30, and a partition plate 40. The power circuit board 30 and the partition plate 40 are assembled inside the heat dissipation case member 20, and after the heat dissipation case member 20 assembles the power circuit board 30 and the partition plate 40 as a unit (as shown in fig. 6), the heat dissipation case member 20 is connected with the battery module 10, specifically, fixedly connected with the frame of the battery compartment case of the battery module 10 through fixing straps on the heat dissipation case member 20 (described in detail below). The heat dissipation case member 20 and the battery module 10 are arranged in parallel, and the heat dissipation case member 20 is located at one side of the battery module 10 in the arrangement direction A1 of the heat dissipation case member 20 and the battery module 10. Fig. 7 is a schematic perspective view of a battery pack according to an embodiment of the present application, where fig. 7 includes two battery packs placed in two directions, and features of the top and bottom of the battery packs are shown respectively.

Referring to fig. 5 and 6, the battery module 10 includes a battery compartment housing 11, and a plurality of battery cells and power lines, signal lines and copper bars connected to the battery cells are accommodated in the battery compartment housing 11. The battery compartment housing 11 includes oppositely disposed front and rear ends 111, 112, the front end 111 having an opening 113 and a bezel 115 surrounding the opening 113. The frame 115 is used for fixedly connecting the heat dissipation case 20. The heat dissipation case member 20 faces the front end 111 of the battery module 10 in the arrangement direction A1 of the heat dissipation case member 20 and the battery module 10. In one embodiment, the heat dissipation case member 20 and the battery module 10 are hermetically connected, for example, by providing a gasket or a gasket.

The battery module 10 includes a connection member 12, the connection member 12 being connected to the battery compartment housing 11, for example, the connection member 12 being fixed to the battery compartment housing 11 by screws. The connector 12 is located at the rear end 112 of the battery compartment housing 11 with a portion of the connector 12 extending beyond the top of the battery compartment housing 11. The portion of the connector 12 that extends beyond the top of the battery compartment housing 11 serves to fix the battery compartment housing of the adjacent battery module 10 during the stacking of the battery packs.

In the embodiment shown in fig. 5, a partition plate 40 is provided between the power circuit board 30 and the battery module 10 for thermal insulation. Specifically, the heat generated by part of the devices of the power circuit board 30 during operation is relatively large, and due to the blocking effect of the partition plate 40, the heat transfer between the power circuit board 30 and the battery module 10 is reduced, so that the influence of the heat generated by the power circuit board 30 on the battery module 10 is reduced, the possibility of valve opening and thermal runaway faults of the battery module 10 is also reduced, and the service life of the battery module 10 is prolonged. The partition plate 40 can also reduce heat conduction from the battery module 10 to the power circuit board 30, thereby reducing the occurrence of condensation phenomenon of the power circuit board 30 and reducing adverse effects of the condensation phenomenon on the power circuit board.

Based on the embodiment shown in fig. 5, according to specific usage requirements (for example, the usage environment of the battery pack will not generate condensation phenomenon or the heat dissipation structure of the battery pack will make the heat generated by the power circuit board be conducted in time), in one embodiment, only the power circuit board 30 may be disposed in the heat dissipation housing 20, and no partition plate is disposed in the battery pack.

Fig. 8 and 9 are schematic diagrams of two directions of a power circuit board according to an embodiment of the present application. Fig. 10 is a schematic cross-sectional view of a power circuit board according to an embodiment of the present application. Referring to fig. 8, 9 and 10, the power circuit board 30 includes a substrate 31 and a plurality of electronic devices 32 disposed on the substrate 31. The substrate 31 includes a first surface 311 and a second surface 312, fig. 8 is a schematic diagram of the distribution of the electronic devices on the first surface 311, and fig. 9 is a schematic diagram of the distribution of the electronic devices on the second surface 312. The electronic device 32 includes a first device 321, a second device 322, and a third device 323.

As shown in fig. 8, the first device 321 and the second device 322 are disposed on the first surface 311, and the first surface 311 is provided with a plurality of electronic devices having different heights. In one embodiment, the first device 321 is a transformer and the second device 322 is an inductor. The first surface 311 is further provided with a capacitor 324 and other electronic devices. In one embodiment, the power circuit board 30 further includes a first control board 327, where the first control board 327 is disposed on the first surface 311 in a vertical manner. Specifically, the control substrate for mounting electronic devices of the first control board 327 may be perpendicular to the substrate 31, and an angle smaller than 90 degrees may be formed between the control substrate for mounting electronic devices of the first control board 327 and the substrate 31, i.e., the first control board 327 is obliquely standing on the first surface 311. In one embodiment, a second control board 328 is further inserted on the first surface 311 of the substrate 31. In one embodiment, the second control board 328 and the first control board 327 are spaced apart from each other, and other electronic devices may be disposed on the first surface 311 therebetween. The first surface 311 between the second control board 328 and the first control board 327 may also be in an idle state, i.e., without any electronic devices.

As shown in fig. 8, the power circuit board 30 is provided with an auxiliary heat dissipation structure 325, the auxiliary heat dissipation structure 325 is used for dissipating heat of a power tube disposed on the substrate 31, specifically, the power tube is obliquely inserted on the substrate, a heat generating surface of the power tube is inclined relative to a surface of the substrate, the auxiliary heat dissipation structure 325 is fixed on the substrate 31, and a gap exists between the auxiliary heat dissipation structure 325 and the heat generating surface of the power tube. The auxiliary heat dissipation structure 325 is used for conducting heat to the heat dissipation case 20 to conduct the heat generated by the power tube in the working state.

As shown in fig. 9, the third device 323 is disposed on the second surface 312, and the area within the dashed-line frame in fig. 9 is an area where the third device 323 is disposed, it is understood that the third device 323 may be plural and distributed within the dashed-line frame. As shown in fig. 9, a number of connector structures are further provided on the second surface 312, through which electrical connection between the power circuit board 30 and the battery module 10 can be achieved. For example, the third device 323 may be a device that generates heat in an operating state such as a low-voltage MOS transistor.

As shown in fig. 10, the first device 321 and the second device 322 protrude at different heights with respect to the first surface 311, and the height H1 of the first device 321 protruding with respect to the first surface 311 is greater than the height H2 of the second device 322 protruding with respect to the first surface 311. In particular, the first device 321 and the second device 322 have their heights different due to the different types of electronic devices, for example, the height of the inductor and the height of the transformer are different. In one embodiment, the first device 321 is a transformer and the second device 322 is an inductor.

In one embodiment, the substrate 31 may be provided with heat dissipation through holes 314, and the heat dissipation through holes 314 may be disposed around the third device 323, and the heat dissipation through holes 314 penetrate the first surface 311 and the second surface 312.

Fig. 11 is a schematic perspective view of one direction of a heat dissipation case provided in an embodiment of the present application, and fig. 12 is a schematic perspective view of another direction of the heat dissipation case provided in an embodiment of the present application. Referring to fig. 11 and 12, the heat dissipation case 20 includes a bottom wall 21 and a plurality of side walls 22 surrounding and connected to the edge of the bottom wall 21, where the plurality of side walls 22 are sequentially connected to each other and enclose a receiving space 20R together with the bottom wall 21. The ends of the plurality of side walls 22 remote from the bottom wall 21 constitute open ends of the heat dissipation case 20. The bottom wall 21 includes a first inner wall 211 and a second inner wall 212. The first inner wall 211 and the second inner wall 212 are partial areas of the bottom wall 21, the inner surface of the first inner wall 211 facing the open end and the inner surface of the second inner wall 212 facing the open end are not coplanar, and the heat dissipation efficiency is improved through the design of different surfaces between the first inner wall 211 and the second inner wall 212, so that the first inner wall 211 and the second inner wall 212 can dissipate heat for devices with different heights. Specifically, the vertical distance between the first inner wall 211 and the reference surface is greater than the vertical distance between the second inner wall 212 and the reference surface with the plane formed by the edge of the side wall 22 away from the bottom wall 21 as the reference surface.

The heat dissipation case 20 further includes a first boss 213 therein, wherein a bottom end of the first boss 213 is connected to an inner surface of the bottom wall 21, and a gap exists between a surface of a top end of the first boss 213 and a substrate of the power circuit board, so as to achieve heat dissipation of the third device. The vertical distance between the bottom end and the top end of the first boss 213 is the height of the first boss 213, and the height of the first boss 213 is greater than the sizes of the first inner wall 211 and the second inner wall 212 protruding from the bottom wall.

Two oppositely disposed sidewalls 22 of the plurality of sidewalls 22 are a first sidewall 221 and a second sidewall 222, another two oppositely disposed sidewalls 22 of the plurality of sidewalls 22 are a third sidewall 223 and a fourth sidewall 224, the third sidewall 223 is connected between the first sidewall 221 and the second sidewall 222, and the fourth sidewall 224 is also connected between the first sidewall 221 and the second sidewall 222. In the present embodiment, a rectangular frame structure is surrounded by four side walls 22.

Referring to fig. 11 and 12, the outer surface of the end of the side wall 22 remote from the bottom wall 21 is provided with a fixing band 23 protruding. In one embodiment, the number of the fixing bands 23 is two, and the fixing bands are respectively located at the outer edges of the ends of the first and second side walls 221 and 222 away from the bottom wall 21. In this embodiment, the two fixing belts 23 are both in a straight strip shape, and the fixing belts 23 are used for fixedly connecting with the battery module through fasteners such as screws. In one embodiment, a plurality of fastener holes 231 may be provided in the fastening strip 23 for engagement with fasteners. As shown in fig. 12, four fixing holes 231 are provided on each fixing belt 23.

Referring to fig. 11 and 12, the bottom wall 21, the first side wall 221 and the second side wall 222 are all provided with a plurality of heat dissipating fins 228, the third side wall 223 and the fourth side wall 224 are used for abutting against the heat dissipating shell in the adjacent battery pack, and no heat dissipating fins are provided on the third side wall 223 and the fourth side wall 224. The third side wall 223 and the fourth side wall 224 are disposed opposite to each other in the height direction of the energy storage device, each heat dissipation fin 228 is elongated, and the length direction of each heat dissipation fin 228 is the height direction of the energy storage device. A heat radiating fin 228 extends between the third side wall 223 and the fourth side wall 224, and both ends of the heat radiating fin 228 are adjacent to the third side wall 223 and the fourth side wall 224, respectively.

Referring to fig. 11, the first baffle 217 and the second baffle 218 are disposed on the inner surface of the bottom wall 21 of the heat dissipation case 20 in a protruding manner, and a receiving space 219 is formed between the first baffle 217 and the second baffle 218, and the receiving space 219 is used for receiving the first control board on the power circuit board. The first baffle 217 is in a flat plate shape, at least part of the second baffle 218 is bent and extended, the second baffle 218 comprises a first portion 2181, a second portion 2182 and a connecting portion 2183, the distance between the first portion 2181 and the first baffle 217 is smaller than the distance between the second portion 2182 and the first baffle 217, and the connecting portion 2183 is connected between the first portion 2181 and the second portion 2182.

Referring to fig. 11, the heat dissipation housing 20 includes a plurality of mounting posts 229, the mounting posts 229 are located in the accommodating space 20R and connected to the bottom wall 21, in a direction perpendicular to the bottom wall 21, one end of each mounting post 229 is fixedly connected to the bottom wall 21, the mounting posts 229 and the bottom wall 21 can be integrally formed, a fixing hole 2291 is formed in an end face of the other end of each mounting post 229, an end face of each mounting post 229 away from the bottom wall 21 is used for bearing a power circuit board, and the fixing holes 2291 are used for fixing the power circuit board in cooperation with screws. The heat dissipation case 20 is internally provided with a mounting stand 201, the mounting stand 201 being located on the inner surface of the side wall 22, the mounting stand 201 being located at a position between the edge of the side wall 22 connecting the bottom wall 21 and the edge of the side wall 22 distant from the bottom wall 21 in a direction perpendicular to the bottom wall 21. The mounting table 201 is for supporting the partition plate 40.

In one embodiment, the height of the mounting post 229 protruding from the bottom wall 21 is greater than the height of the first boss 213 protruding from the bottom wall 21, and a gap between the first boss 213 and the first surface of the substrate of the power circuit board accommodates a heat conducting medium, such as a heat conducting glue or a heat conducting pad, for example, the thickness of the heat conducting pad may be 2.5mm or 5mm, etc. The mounting posts 229 may contact the first surface of the substrate.

Referring to fig. 11 and 12, the third side wall 223 includes a first plugging portion 225, the fourth side wall 224 includes a second plugging portion 226, and the first plugging portion 225 has a structure configured to be capable of being plugged and mated with the second plugging portion 226. Specifically, the first plugging portion 225 protrudes from the third side wall 223, the second plugging portion 226 is a concave structure provided on the fourth side wall 224, and the outer contour of the first plugging portion 225 is identical to the contour structure of the space surrounded by the inner wall of the second plugging portion 226. In the energy storage device, the heat dissipation shell pieces 20 of adjacent battery packs are in stacked connection through mutual plug-in fit between the first plug-in connection part 225 and the second plug-in connection part 226. Of the two heat dissipation case members in the stacked and connected state, an outer surface of the third side wall 223 of one heat dissipation case member is in contact with an outer surface of the fourth side wall of the other heat dissipation case member.

Referring to fig. 11 and 12, the first plugging portion 225 includes a first accommodating cavity 2251, the second plugging portion 226 includes a second accommodating cavity 2261, and both the first accommodating cavity 2251 and the second accommodating cavity 2261 are in communication with the accommodating space 20R in the heat dissipation housing 20. Specifically, the first accommodation chamber 2251 and the second accommodation chamber 2261 are both passages that communicate the accommodation space 20R and the space outside the heat dissipation case. The first and second receiving chambers 2251 and 2261 serve to receive a connection terminal through which an electrical connection between the power circuit board and the control unit of the energy storage device is achieved.

In a specific embodiment, a sealing structure may be disposed on a mating surface between the first plug portion 225 and the second plug portion 226 to achieve a sealed connection. For example, a sealing ring is sleeved on the periphery of the first plug-in portion 225. The first plug-in connection portion 225 is inserted into the second plug-in connection portion 226, and is connected between the first plug-in connection portion 225 and the second plug-in connection portion 226 in a sealing manner through a sealing ring. In the embodiment shown in fig. 11, the first plugging portion 225 has a racetrack-shaped annular structure. In other embodiments, the first plug portion 225 may have a circular ring structure, a polygonal ring structure, or the like.

In one embodiment, referring to fig. 12, the heat dissipating shell 20 further includes a baffle structure 227, where the baffle structure 227 is connected to an edge of the bottom wall 21 and extends in an extension plane of the bottom wall 21. Specifically, the baffle structure 227 and the bottom wall 21 are integrally formed. The baffle structure 227 is located at one side of the first plugging portion 225 and is used for shielding the first plugging portion 225, and in a direction perpendicular to the bottom wall 21, a vertical projection of the first plugging portion 225 on the baffle structure 227 is located within the range of the baffle structure 227. Fig. 13 is a schematic diagram of a stacked connection of two heat dissipating shells. Referring to fig. 13, in the energy storage device, the connection structure between two adjacent heat dissipation case members is shielded by the baffle structure 227, and the baffle structure 227 may be fixedly connected to the edge of the bottom wall 21 of the adjacent heat dissipation case member by screws.

Referring to fig. 12 and 13 in combination, the end of the baffle structure 227 remote from the bottom wall 21 overlaps the fins on the outer surface of the bottom wall of the adjacent heat dissipating shell. The heat dissipation fin 228 includes a fin main body 2281 and a stopper step 2282 located at one side of the fin main body 2281 and adjacent to the fourth side wall 224, the stopper step 2282 protruding at the outer surface of the bottom wall 21 to a smaller height than the fin main body 2281 protruding at the outer surface of the bottom wall 21. The stop step 2282 is configured to mate with an edge of the baffle structure 227, and the baffle structure 227 is overlapped on the stop step 2282.

Referring to fig. 14, 15, 16 and 17, the battery pack further includes a first connector 50 and a second connector 60, the first connector 50 is fixed in the first accommodating cavity 2251 of the first plugging portion 225, the second connector 60 is fixed in the second accommodating cavity 2261 of the second plugging portion 226, the first connector 50 and the second connector 60 can be electrically connected by plugging and mating, and the first connector 50 and the second connector 60 are electrically connected with the power circuit board. Fig. 14 is a schematic view of the first connector 50 before mating with the second connector 60. Fig. 15 is a schematic view of the first connector 50. Fig. 16 is a schematic view of the second connector 60 mounted in the second receiving cavity 2261 of the second plug portion 226. Fig. 17 is a schematic view of the first connector 50 installed in the first receiving cavity 2251 of the first plug section 225. The first connector 50 connects the cable 70 and the connector 80, and the connector 80 is electrically connected to the power circuit board. The first connector 50 is secured to the first mating portion 225 by a fastener, and the second connector 60 is secured to the second mating portion 226 by a fastener.

Referring to fig. 18, fig. 18 is a perspective view of the power circuit board and the partition plate 40 assembled in the heat dissipation case 20 and forming a unitary structure. Fig. 19 is a sectional view of the P1-P1 position shown in fig. 18, and fig. 20 is a sectional view of the P2-P2 position shown in fig. 18.

Referring to fig. 19 and 20, the first inner wall 211 and the second inner wall 212 face the base plate 31 and the partition plate 40. The top side of the separator 40 is used to assemble the battery module, and it can be understood that: the first inner wall 211 and the second inner wall 212 face the battery module. The fixing strap 23 is used for fixedly connecting with the battery module. The side wall 22 of the heat dissipation case 20 has a sealing groove 2201 at an open end thereof, the sealing groove 2201 accommodates a sealing ring 2202, and the sealing ring 2202 is used for realizing sealing connection between the heat dissipation case 20 and the battery module.

The power circuit board 30 is assembled in the receiving space of the heat dissipation case 20 and is located between the heat dissipation case 20 and the partition plate 40. It will be appreciated that the divider plate 40 is snap fit over the open end of the heat dissipating housing member 20. The edge of the partition plate 40 is provided with a connecting frame 41, the connecting frame 41 and the mounting table 201 are arranged oppositely, and sealing connection between the partition plate 40 and the heat dissipation shell 20 is realized by arranging a sealing piece 411 between the connecting frame 41 and the mounting table 201.

Referring to fig. 19 and 20, the heat dissipation case 20 has a thermally conductive connection between the first inner wall 211 and the first device 321, and a thermally conductive connection between the second inner wall 212 and the second device 322. The thermally conductive connection can be understood as: the two are connected by a heat conducting medium (such as heat conducting glue and heat conducting pad), namely heat transmission exists between the two. The distance between the first surface 311 and the first inner wall 211 is different from the distance between the first surface 311 and the second inner wall 212 due to the difference in the heights of the protrusions of the first device 321 and the second device 322 on the substrate 31.

Referring to fig. 19, the two ends of the first boss 213 of the heat dissipation case 20 are respectively located at the position of the first surface 311 of the substrate 31 and the bottom wall 21 of the heat dissipation case 20. The first surface 311 is in thermally conductive connection with the first boss 213 at a location corresponding to the third device 323. The first boss 213 can conduct the heat generation amount of the third device 323 in the operating state to the bottom wall of the heat dissipation case 20, and is emitted to the outside through the heat dissipation fins.

Referring to fig. 21A, a first heat conducting medium 71 is disposed between the first inner wall 211 of the heat dissipating casing 20 and the first device 321, and a second heat conducting medium 72 is disposed between the second inner wall 212 of the heat dissipating casing 20 and the second device 322. In one embodiment, the thickness of the first heat transfer medium 71 is the same as the thickness of the second heat transfer medium 72, and the thickness of the first heat transfer medium 71 and the thickness of the second heat transfer medium 72 are their dimensions in the arrangement direction (direction perpendicular to the first surface 311) of the heat dissipation case member 20 and the battery module.

Referring to fig. 21B, the accommodating space 219 between the first board 217 and the second board 218 in the heat dissipation case 20 is used for accommodating the first control board 327 on the power circuit board, the surface of the first control board 327 facing the second board 218 is provided with electronic devices, and the second board 218 is designed to have at least a part of bending shape, so that the bending space of the second board 218 can accommodate the electronic devices with larger size on the first control board 327. The two sides of the first control board 327 are provided with the first baffle 217 and the second baffle 218, so that thermal isolation is formed between the space where the first control board 327 is located and other spaces on the power circuit board, the working temperature of the first control board 327 can be protected from being lower, and the heat of the power heating device on the power circuit board is prevented from affecting the normal work of the first control board 327.

Referring to fig. 22, in the energy storage device, three battery packs 1001 are stacked on a base 1003, and a connection member 12 on a battery module of the battery pack 1001, a first plugging portion 225 on a heat dissipation case member, and a barrier structure 227 are exposed before the battery pack 1001 is assembled with the control unit 1002. The connecting member 12, the first plugging portion 225 and the baffle structure 227 are used for assembling and matching with the control unit 1002, and the connection between the control unit 1002 and the battery pack 1001 is achieved by inserting the first plugging portion 225 and the baffle structure 227 into the corresponding structures of the control unit 1002. Fig. 23 is a schematic view of a base in the energy storage device shown in fig. 22. The base 1003 is provided with a plugging structure 10031, and the plugging structure 10031 is used for being matched with a second plugging part in the battery pack 1001 above the base 1003, so that the base 1003 and the battery pack 1001 are connected. The structure of the plugging structure 10031 is the same as the structure of the first plugging portion on the heat dissipation case of the battery pack.

It is to be understood that the terms such as "comprises" and "comprising," when used in this application, specify the presence of stated features, operations, or components, and are not to be limited to one or more additional features, operations, or components. In this application, terms such as "comprising" and/or "having" are to be construed to mean that a particular feature, number, operation, constituent element, component, or combination thereof is specified, but is not to be construed to exclude the presence or addition of one or more other features, numbers, operations, constituent elements, components, or combination thereof.

Furthermore, in this application, the expression "and/or" includes any and all combinations of the words listed in association. For example, the expression "a and/or B" may include a, may include B, or may include both a and B.

In this application, expressions including ordinal numbers such as "first" and "second" and the like may modify each element. However, such elements are not limited by the above expression. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. For example, the first user device and the second user device indicate different user devices, although both the first user device and the second user device are user devices. Similarly, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.

When a component is referred to as being "connected" or "connected" to another component, it should be understood that: the component is not only directly connected or connected to other components, but there can also be another component between the component and the other components. On the other hand, where components are referred to as being "directly connected" or "directly accessed" to other components, it should be understood that there are no other components between them.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (15)

1. The battery pack is characterized by comprising a battery module, a heat dissipation shell and a power circuit board, wherein the heat dissipation shell is arranged in parallel with the battery module, the heat dissipation shell is connected with the battery module, and the power circuit board is positioned in the heat dissipation shell;

the power circuit board comprises a substrate, a first device and a second device, wherein the substrate comprises a first surface and a second surface which are arranged in opposite directions, the second surface faces the battery module, and the first device and the second device are arranged on the first surface in a protruding mode and are different in protruding height relative to the first surface;

The heat dissipation case member includes a first inner wall and a second inner wall facing the first surface in an arrangement direction of the heat dissipation case member and the battery module, a distance between the first surface and the first inner wall being different from a distance between the first surface and the second inner wall;

a gap exists between the first inner wall and the first device, and a gap exists between the second inner wall and the second device.

2. The battery pack according to claim 1, wherein the slit is for accommodating a heat transfer medium, a thickness of the heat transfer medium between the first inner wall and the first device is the same as a thickness of the heat transfer medium between the second inner wall and the second device, the thickness of the heat transfer medium being a dimension of the heat transfer medium in an arrangement direction of the heat dissipation case member and the battery module.

3. The battery pack of claim 1, wherein the power circuit board includes a third device disposed on the second surface, the heat dissipation case includes a first boss facing the first surface, the first boss and the third device are disposed opposite to each other, and a gap exists on the first surface corresponding to a position of the third device and the first boss.

4. The battery pack of claim 3, wherein the substrate is provided with heat dissipation through holes located around the third device and penetrating through the first surface and the second surface, the heat dissipation through holes being located in a projection area of the first boss on the substrate.

5. The battery pack of claim 1, wherein the power circuit board comprises a first control board, the first control board is vertically arranged on the first surface, a first baffle and a second baffle are arranged on the inner surface of the heat dissipation shell in a protruding mode, a containing space is formed between the first baffle and the second baffle, and the first control board is located in the containing space.

6. The battery pack according to claim 5, wherein the first baffle is flat, at least part of the second baffle is bent and extended, the second baffle includes a first portion, a second portion, and a connection portion, a distance between the first portion and the first baffle is smaller than a distance between the second portion and the first baffle, the connection portion is connected between the first portion and the second portion, and a surface of the first control board facing the second baffle is provided with electronic devices having different sizes.

7. The battery pack according to claim 1, wherein the heat dissipation case member includes a bottom wall and a plurality of side walls surrounding and connected to edges of the bottom wall, the plurality of side walls are sequentially connected and jointly enclose an accommodating space with the bottom wall, the power circuit board is located in the accommodating space, the bottom wall and the substrate are oppositely arranged, and the first inner wall and the second inner wall are both partial areas of the bottom wall.

8. The battery pack according to claim 7, wherein an outer surface of one end of the plurality of side walls remote from the bottom wall is provided with a fixing band protruding therefrom, the fixing band being fixedly connected to the battery module.

9. The battery pack of claim 8, wherein two of the plurality of side walls are a first side wall and a second side wall, the securing strap is located at an outer edge of an end of the first side wall and the second side wall away from the bottom wall, the other two of the plurality of side walls are a third side wall and a fourth side wall, the third side wall is connected between the first side wall and the second side wall, the fourth side wall is also connected between the first side wall and the second side wall, the third side wall includes a first mating portion, the fourth side wall includes a second mating portion, and the first mating portion is configured to mate with the second mating portion.

10. The battery pack according to claim 9, wherein a first accommodating cavity is formed in the first plugging portion, a second accommodating cavity is formed in the second plugging portion, the battery pack further comprises a first connector and a second connector, the first connector is fixed in the first accommodating cavity, the second connector is fixed in the second accommodating cavity, the first connector and the second connector can be electrically connected through plugging fit, and the first connector and the second connector are electrically connected with the power circuit board.

11. The battery pack of claim 9, wherein heat dissipating fins are provided on the bottom wall, the first side wall and the second side wall, and the third side wall and the fourth side wall are configured to interface with the heat dissipating case in an adjacent battery pack.

12. The battery pack of claim 7, wherein the heat dissipation case member includes a plurality of mounting posts located within the receiving space and connected to the bottom wall, the base plate being fixedly connected to the mounting posts.

13. The battery pack of claim 7, further comprising a separator plate connected to the heat dissipation case and located in the receiving space, the separator plate being located between the second surface and the battery module.

14. The battery pack according to any one of claims 1 to 13, wherein the heat dissipation case member and the battery module are hermetically connected.

15. An energy storage device comprising a plurality of the battery packs of any one of claims 1-14, wherein a plurality of the battery packs are stacked.