CN216750063U - A battery pack and electrical device - Google Patents

Abstract

The application discloses battery package and electric installation. The battery pack comprises a box body and a plurality of layers of module assemblies, wherein an accommodating cavity is formed in the box body; the plurality of layers of module assemblies are arranged in the accommodating cavity, and a cooling assembly is arranged between every two adjacent layers of module assemblies. The battery pack is characterized in that a plurality of layers of module assemblies are arranged in a box body of the battery pack, and the support performance of the module assemblies on the box body can be ensured through the arrangement of the module assemblies; set up cooling module between adjacent two-layer module subassembly, cooling module alright cool off its module subassembly that contacts to can realize cooling module's integration, with the occupation space that reduces the battery package.

Description

A battery pack and electrical device

technical field

The present application relates to the field of battery technology, and in particular, to a battery pack and an electrical device.

Background technique

In recent years, with the development of electric vehicles, the use of battery packs has become more and more extensive, so the requirements for the battery pack's endurance and its cooling integration efficiency have become higher and higher. At present, most of the battery pack designs still use a single-layer design, and only a few models have a double-layer design. However, in the existing battery pack design, the integration efficiency of the water-cooling plate is low, and the structural strength of the support is insufficient, which may easily lead to structural failure.

Utility model content

The purpose of the present application is to overcome the above deficiencies and provide a battery pack and an electrical device to solve the problems of low support strength of the existing battery pack and low integration efficiency of the cooling plate.

In a first aspect, the present application provides a battery pack, which includes a box body and several layers of module assemblies, and a accommodating cavity is formed inside the box body; A cooling assembly is provided.

In the technical solution of the embodiment of the present application, several layers of module assemblies are arranged in the box, and the support performance of the module components to the box can be ensured through the arrangement of the module components; a cooling component is arranged between two adjacent layers of module components , the cooling assembly can cool the module assembly in contact with it, so that the integration of the cooling assembly can be realized, so as to reduce the occupied space of the battery pack.

In some embodiments, the cooling assembly includes a water-cooling plate, and the water-cooling plate is disposed between two adjacent layers of module assemblies. Under the setting of the water-cooling plate, the adjacent two-layer module assemblies can be cooled, so that the two-layer adjacent module assemblies can share one water-cooling plate, thereby realizing the integration of the water-cooling plate and reducing the space occupied by the water-cooling plate in the battery pack.

In some embodiments, the module assembly includes a locking structure and a plurality of modules, and each module is fixed in the accommodating cavity in the box through the locking structure. Under the setting of the locking structure, a plurality of modules can be fixed in the accommodating cavity of the box body, and the locking structure can increase the supporting strength of the battery pack.

In some embodiments, the locking structure includes a stringer, and the module has an end plate that is locked to the stringer. The arrangement of the longitudinal beams can fix the end plates of the modules on the longitudinal beams, so that the modules can be stably installed in the accommodating cavity of the box body.

In some embodiments, the locking structure includes a beam, a longitudinal beam disposed on the side wall of the beam, the module has an end plate, and the end plate is locked on the longitudinal beam. Under the arrangement of the beam and the longitudinal beam, the longitudinal beam can fix the module in the accommodating cavity of the box, and the beam can be connected to the longitudinal beam to improve the stability of the longitudinal beam, thereby further increasing the structural strength of the battery pack.

In some embodiments, the module has side panels that are latched to the beams. When the side plate of the module is connected with the beam, the stability of the module installed in the accommodating cavity of the box can be further improved.

In some embodiments, the transverse beams and the longitudinal beams are perpendicular to each other. When the beam and the longitudinal beam are perpendicular to each other, the structural stability between the beam and the longitudinal beam and the supporting strength of the battery pack can be ensured.

In some embodiments, the height of the beam is greater than the height of the module. Under the setting of the height of the beam and the module, the battery pack can be supported by the beam, which can prevent the battery pack from directly acting on the module when it is stressed, thereby improving the protection of the module.

In some embodiments, the height of the stringers is greater than the height of the module. Under the setting of the height of the longitudinal beam and the module, the battery pack can be supported by the longitudinal beam, which can prevent the battery pack from directly acting on the module when it is stressed, thereby improving the protection of the module.

In some embodiments, the end plates are extended with cantilever beams that are latched to the longitudinal beams. The setting of the cantilever beam on the end plate can connect the end plate on the module with the longitudinal beam.

In some embodiments, the side plate is extended with a cantilever beam, and the cantilever beam is locked and attached to the cross beam. The setting of the cantilever beam on the side plate can connect the side plate on the module with the longitudinal beam.

In some embodiments, the side plate is provided with a flange plate, and the flange plate is used to stabilize the battery cells on the cooling assembly. The flanging plate can wrap the cells in the module, so as to prevent the cells from being separated from the side plate of the module, and at the same time, it can ensure that the cells can be in contact with the water cooling plate.

In some embodiments, the side of the water-cooling plate close to the module assembly is thermally conductive through thermal pads, thermally conductive silicone grease or thermally conductive structural adhesives. The thermally conductive pad, thermally conductive silicone grease or thermally conductive structural adhesive arranged on the water cooling plate can improve its thermal conductivity, thereby improving the efficiency of thermal conduction.

In some embodiments, a water-cooling connector is provided on the water-cooling plate, a water-cooling interface is provided at a position of the box corresponding to the water-cooling connector, and the water-cooling connector passes through the water-cooling interface. The arrangement of the water-cooling connector on the water-cooling plate can improve the integration efficiency, and the water-cooling connector is directly connected to the water-cooling plate and led to the outside of the battery pack. The soft connection interface of the water-cooling system is outside the battery pack, which can reduce the leakage risk of water-cooling liquid.

In some embodiments, cover plates are arranged on both sides of the box body, and a gap is arranged between the cover plates and the module. Under the setting of the gap, the module can be prevented from directly contacting the cover plate, so as to prevent the cover plate from acting on the module when the force is applied, thereby effectively improving the protection of the module.

In some embodiments, a protective layer is provided within the gap. Under the setting of the protective layer, the cover plate of the battery pack can be burned through when the cells are thermally out of control.

In some embodiments, the electrode columns of the modules are all facing their adjacent cover plates. Under the setting of the electrode column direction on the module, it can ensure that the modules with adjacent cover plates are directly sprayed with high-temperature gas into the adjacent modules when thermal runaway occurs, which can effectively reduce the cost of the modules adjacent to the cover plates. The probability of thermal runaway of other modules when thermal runaway occurs.

In a second aspect, the present application provides an electrical device, comprising the above-mentioned battery pack, where the battery pack is used to provide electrical energy.

By adopting the above-mentioned technical scheme, the beneficial effects of the present application are:

1. In the present application, several layers of module assemblies are arranged in the casing of the battery pack, and the support performance of the module assemblies to the casing can be ensured through the setting of the module assemblies; The component can cool the module components in contact with it, so that the integration of the cooling components can be realized, so as to reduce the occupied space of the battery pack.

2. In this application, the battery pack is applied to the electrical device, which can provide electrical energy for the electrical device, which can effectively ensure the integration efficiency of the cooling component of the battery pack, and at the same time ensure the supporting strength of the battery pack, so as to improve the protection capability and the battery pack. Safety in use.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

These and other objects of the present application will no doubt become more apparent from the following detailed description of the preferred embodiment described in the various figures and drawings.

In order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, one or more preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and together with the embodiments of the present application, they are used to explain the present application, and do not constitute a limitation to the present application.

In the drawings, like parts are given the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is one or several embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to such drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a battery pack according to some embodiments of the present application;

2 is a schematic diagram of an exploded structure of a battery pack according to some embodiments of the present application;

3 is a schematic structural diagram of a box body and a module assembly according to some embodiments of the present application;

FIG. 4 is an enlarged schematic structural diagram of A in FIG. 3 according to some embodiments of the present application;

5 is a schematic structural diagram of a locking structure according to some embodiments of the present application;

6 is a schematic structural diagram of a module according to some embodiments of the present application;

7 is a schematic diagram of an exploded structure of a module according to some embodiments of the present application;

FIG. 8 is a schematic structural diagram of an electrical device according to some embodiments of the present application.

The reference numerals in the specific embodiment are as follows:

10. Battery pack;

1. Box body;

11. Accommodating cavity; 12. Water cooling interface; 13. High and low pressure connector interface; 14. Balance explosion-proof valve;

2. Module components;

21, module; 211, end plate; 212, side plate; 213, cantilever beam; 214, battery core; 215, flanging plate; 216, heat insulation pad; 217, insulating cover;

22, locking structure; 221, beam; 222, longitudinal beam;

3. Cooling component; 31. Water cooling plate; 32. Water cooling joint;

4. Cover plate;

5. Electrical device.

Detailed ways

The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and are therefore only used as examples, and cannot be used to limit the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this application; the terms used herein are for the purpose of describing specific embodiments only, and are not intended to be Limiting this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and should not be understood as indicating or implying relative importance or implying the number, specificity and quantity of indicated technical features. Sequential or primary and secondary relationships. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only an association relationship for describing associated objects, indicating that there may be three relationships, such as A and/or B, which may indicate that A exists alone, and A exists at the same time and B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to is more than two pieces (including two pieces).

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "horizontal", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical" "Horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on those shown in the accompanying drawings The orientation or positional relationship is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as implementing the present application. example limitations.

In the description of the embodiments of the present application, unless otherwise expressly specified and limited, the technical terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a fixed connection. The connection can be disassembled or integrated; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two elements or the interaction relationship between the two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as water, fire, wind and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as military equipment and aerospace and other fields. . With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

Among them, the battery pack in the power battery, with the development of electric vehicles, the battery pack is used more and more widely, so the requirements for the battery pack's endurance and its cooling integration efficiency are getting higher and higher. At present, most of the battery pack designs still use a single-layer design, and only a few models have a double-layer design.

The current battery pack design generally has two methods. One is to use a stacking design. However, in order to cool adjacent modules, multiple water-cooling plates are required. The integration efficiency is low, and the stacking requires high process accuracy. Adding a sealing interface to the pack is easy to increase the probability of sealing failure; the other is to add a bracket inside the battery pack to support the upper module, but due to the limited support points, the structural strength of the upper module is not enough, which may easily lead to structural failure. And this design is very prone to thermal spread due to thermal runaway of the cell.

Based on the above considerations, in order to solve the problems of low integration efficiency of the battery pack water-cooling plate and insufficient structural strength between adjacent modules, a battery pack is designed. The sharing of water-cooling plates improves the integration efficiency of water-cooling plates, and water-cooling joints are set on the water-cooling plates to reduce the risk of water-cooling leakage; support beams are set on the modules, and then the support beams are fixed in the main body, so as to ensure sufficient Structural strength, the electrode columns of the cells in the adjacent modules are facing their adjacent cover plates, thereby reducing the direct injection of high-temperature gas into the adjacent modules when the cells in the module are thermally out of control, reducing the thermal runaway of the cells. Probability of thermal runaway of adjacent cells.

According to some embodiments of the present application, referring to FIGS. 1-2 , FIG. 1 is a schematic structural diagram of a battery pack according to some embodiments of the present application; FIG. 2 is a schematic diagram of an exploded structure of a battery pack according to some embodiments of the present application. The present application provides a battery pack 10 . The battery pack 10 includes a box body 1 and several layers of module assemblies 2. The box body 1 forms a accommodating cavity 11 inside; A cooling assembly 3 is arranged between.

Box 1 refers to an assembly with an accommodating cavity 11, which can provide accommodation space for module assembly 2. Box 1 can adopt various structures and can be formed into various shapes, such as a cylinder, a cuboid, etc. A high and low pressure connector interface 13 and a balanced explosion-proof valve 14 are provided, and the high and low pressure connector interface 13 and the balanced explosion-proof valve 14 can be adjusted in two positions according to actual needs. The cooling assembly 3 refers to an assembly capable of lowering the temperature of an object without a phase change.

In the technical solution of the embodiment of the present application, several layers of module assemblies 2 are arranged in the box body 1, and the support performance of the module modules 2 to the box body 1 can be guaranteed by the arrangement of the module modules 2; A cooling component 3 is arranged between the components 2, and the cooling component 3 can cool the module components 2 in contact with the cooling component 3, so that the integration of the cooling component 3 can be realized and the occupied space of the battery pack 10 can be reduced.

According to some embodiments of the present application, optionally, the cooling assembly 3 includes a water cooling plate 31 , and the water cooling plate 31 is disposed between two adjacent layers of the module assemblies 2 .

The water-cooling plate 31 refers to the production of a whole harmonica tube through the extrusion molding process, which can ensure that the upper and lower surfaces of the water-cooling plate 31 are relatively flat, and then the water-cooling tube on the water-cooling plate 31 is processed and laser welded to form a complete water-cooling circuit. , and the cooling liquid is introduced into the circuit for circulating cooling, and the cooling effect can be realized.

Under the setting of the water-cooling plate 31, the adjacent two-layer module assemblies 2 can be cooled, thereby realizing that the two-layer adjacent module assemblies 2 share one water-cooling plate 31, thereby realizing the integration of the water-cooling plate and reducing the water-cooling plate 31. Occupies the space of the battery pack 10 .

According to some embodiments of the present application, optionally, please refer to FIGS. 3-5 . FIG. 3 is a schematic structural diagram of a box body and a module assembly according to some embodiments of the present application; FIG. 4 is a schematic diagram of FIG. 4 of some embodiments of the present application. An enlarged schematic view of the structure of A; FIG. 5 is a schematic view of the structure of the locking structure according to some embodiments of the application. The module assembly 2 includes a locking structure 22 and a plurality of modules 21, and each of the modules 21 passes through the locking structure. 22 is fixed in the accommodating cavity 11 in the box body 1 .

The locking structure 22 refers to the structure used to connect the module 21 and the box body 1. The locking structure 22 can be fixed in the accommodating cavity 11 of the box body 1 by laser welding, or can be directly locked to the box body 1. Under the setting of the locking structure 22 , a plurality of modules 21 can be fixed in the receiving cavity 11 of the box body 1 , and the locking structure 22 can increase the supporting strength of the battery pack 10 . Among them, the module 21 can be a square shell module or a soft package module.

According to some embodiments of the present application, optionally, please continue to refer to FIGS. 3-5 and 6-7. FIG. 6 is a schematic structural diagram of a module according to some embodiments of the present application; FIG. 7 is a module according to some embodiments of the present application. A schematic diagram of an exploded structure is shown, the locking structure 22 includes a longitudinal beam 222 , the module 21 has an end plate 211 , and the end plate 211 is locked on the longitudinal beam 222 .

The end plates 211 refer to the protective components provided at both ends of the module 21 , which are used to set the module 21 and the Pack mounting holes; the longitudinal beams 222 refer to the connecting beams parallel to the end plates 211 of the module 21 . , which is used to connect the module 21 and the box 1; the arrangement of the longitudinal beam 222 can fix the end plate 211 of the module 21 on the longitudinal beam 222, so that the module 21 can be stably installed in the accommodating cavity of the box 1 within 11.

According to some embodiments of the present application, optionally, the locking structure 22 includes a cross beam 221 and a longitudinal beam 222 disposed on the side wall of the cross beam 221, and the module 21 has an end plate 211, and the end plate 211 is locked to the cross beam 221. on the stringer 222.

The beam 221 refers to a connecting beam parallel to the side plate 212 of the module 21, which is used to connect all the beams 221 together; under the setting of the beam 221 and the longitudinal beam 222, the longitudinal beam 222 can fix the module 21 In the accommodating cavity 11 of the box body 1 , the transverse beams 221 can be connected to the longitudinal beams 222 to improve the stability of the longitudinal beams 222 , thereby further increasing the structural strength of the battery pack 10 .

According to some embodiments of the present application, optionally, the module 21 has a side plate 212 , and the side plate 212 is locked on the beam 221 .

The side plates 212 refer to the protective components provided on both sides of the module 21, which are used to protect the sides of the module 21 and are connected with the end plates 211; , the structural strength of the module 21 and the beam 212 can be mutually strengthened, thereby improving the overall structural strength of the battery pack 10 .

According to some embodiments of the present application, optionally, the transverse beam 221 and the longitudinal beam 222 are perpendicular to each other. When the transverse beam 221 and the longitudinal beam 222 are perpendicular to each other, the structural stability between the transverse beam 221 and the longitudinal beam 222 and the supporting strength of the battery pack 10 can be ensured.

According to some embodiments of the present application, optionally, the height of the beam 221 is greater than the height of the module 21 . Under the setting of the height of the beam 221 and the module 21, the battery pack 10 can be supported by the beam 221, which can prevent the battery pack 10 from directly acting on the module 21 when the battery pack 10 is stressed, so that the module 21, the beam 221 and the longitudinal beam can be prevented. The structural strengths of the 222 are mutually reinforcing, thereby improving the overall structural strength of the battery pack 10 .

According to some embodiments of the present application, optionally, the height of the longitudinal beam 222 is greater than the height of the module 21 . Under the setting of the height of the longitudinal beam 222 and the module 21, the battery pack 10 can be supported by the longitudinal beam 222, which can prevent the battery pack 10 from directly acting on the module 21 when it is stressed, thereby improving the protection of the module 21. , the structural strength of the module 21 , the cross beam 221 and the longitudinal beam 222 can be mutually strengthened, thereby improving the overall structural strength of the battery pack 10 .

According to some embodiments of the present application, optionally, please continue to refer to FIGS. 7-8 , the end plate 211 is extended with a cantilever beam 213 , and the cantilever beam 213 is locked on the longitudinal beam 222 . The cantilever beam 213 refers to a structure that protrudes out of the plane and can be used for connection with other structures; the arrangement of the cantilever beam 213 on the end plate 221 can connect the end plate 221 on the module 21 to the longitudinal beam 222 .

According to some embodiments of the present application, optionally, the side plate 212 is extended with a cantilever beam 213 , and the cantilever beam 213 is locked on the cross beam 221 . The arrangement of the cantilever beam 213 on the side plate 212 can connect the side plate 212 on the module 21 with the longitudinal beam 222 .

According to some embodiments of the present application, optionally, a flanged plate 215 is provided on the side plate 212 , and the flanged plate 215 is used to stabilize the battery cells 214 on the cooling assembly 3 .

The flanging plate 215 refers to a structure in which a straight wall or flange with a certain angle is formed along the edge by the action of the mold on the plane part or the curved surface part of the blank; The battery cells 214 are pocketed to prevent the battery cells 214 from being separated from the side plates 212 of the module 21 , and at the same time, to ensure that the battery cells 214 can be in contact with the water cooling plate 31 .

According to some embodiments of the present application, optionally, one side of the water-cooling plate 31 close to the module assembly 2 is thermally conductive through a thermally conductive pad, thermally conductive silicone grease or thermally conductive structural adhesive.

Thermal pads are high-performance gap-filled thermal conductive materials, mainly used for the transfer interface between electronic equipment and heat sinks or product shells. Completely vent the air between the electronic components and the heat sink to achieve adequate contact. The cooling effect is significantly increased.

Thermally conductive silicone grease is commonly known as heat dissipation paste. Thermally conductive silicone grease is made of silicone as the main raw material, and materials with excellent heat resistance and thermal conductivity are added to make a thermally conductive silicone grease-like compound for heat conduction and heat dissipation, so as to ensure electronic instruments. , the stability of the electrical performance of instruments, etc.

Thermally conductive structural adhesive refers to an adhesive that has thermal conductivity, high strength, can withstand large loads, and is resistant to aging, fatigue, corrosion, and has stable performance within the expected life. It is suitable for bonding strong structural parts.

The heat-conducting pad, heat-conducting silicone grease or heat-conducting structural adhesive provided on the water-cooling plate 31 can improve its heat-conducting effect, thereby improving the heat-conducting efficiency.

According to some embodiments of the present application, optionally, please continue to refer to FIG. 3 , the water cooling plate 31 is provided with a water cooling joint 32 , the box 1 is provided with a water cooling interface 12 at a position corresponding to the water cooling joint 32 , and the water cooling joint 32 Pass through the water cooling interface 12 .

The water-cooling joint 32 is a component for connecting the water-cooling plate 31, and is connected with the equipment having water-cooling liquid outside, so as to form the function of water-cooling liquid circulation and play the role of connection. The arrangement of the water cooling connector 32 on the water cooling plate 31 can improve the integration efficiency, and the water cooling connector 32 is directly connected to the water cooling plate 31 and led to the outside of the battery pack 10. The soft connection interface of the water cooling system is outside the battery pack 10, which can reduce water cooling. risk of fluid leakage.

According to some embodiments of the present application, optionally, cover plates 4 are arranged on both sides of the box body 1 , and a gap is arranged between the cover plates 4 and the module 21 . Under the setting of the gap, the module 21 can be prevented from directly contacting the cover plate 4, so as to prevent the cover plate 4 from acting on the module 21 when the cover plate 4 is subjected to force (for example, scratches, impacts, etc.), thereby effectively improving the protection of the module 21. .

According to some embodiments of the present application, optionally, a protective layer is provided in the gap. With the provision of the protective layer, the cover plate 4 can be prevented from being burnt through when the cells 214 are thermally out of control.

According to some embodiments of the present application, optionally, the electrode columns of the module 21 are all facing toward the cover plate 4 adjacent thereto. Under the setting of the electrode column direction on the module 21, it can ensure that the module 21 of the adjacent cover plate 4 is directly sprayed into its adjacent module 21 when thermal runaway occurs, which can effectively reduce the adjacent cover plate. The probability that the module 21 of 4 will cause thermal runaway of other modules 21 when thermal runaway occurs.

According to some embodiments of the present application, referring to FIGS. 1-8 , FIG. 8 is a schematic structural diagram of an electrical device provided by some embodiments of the present application. The present application also provides an electrical device 5 . The electrical device 5 includes a cooling assembly battery pack 10 as described above, and the battery pack 10 is used to provide electrical energy.

The electrical device 5 can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc., wherein the electric toy can include a stationary or mobile electric toy, such as , game consoles, electric car toys, electric ship toys and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

The electrical device 5 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a vehicle such as a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A battery pack 10 is provided inside the electrical device 5 . The battery pack 10 can be used for power supply of the electrical device 5 , for example, the battery pack 10 can be used as an operating power source of the electrical device 5 . The electrical device 5 may further include a controller and a motor, and the controller is used to control the battery pack 10 to supply power to the motor, for example, for starting, navigating, and driving the electrical device 5 for work electricity demand.

In some embodiments of the present application, the battery pack 10 can not only serve as an operating power source for the electrical device 5 , but also serve as a driving power source for the electrical device 5 , instead or partially instead of fuel or natural gas to provide driving power for the electrical device 5 .

There may be multiple battery packs 10 , and the multiple battery packs 6 may be connected in series or in parallel or in a mixed connection. A mixed connection means that the plurality of battery packs 10 are both connected in series and in parallel. A plurality of battery packs 10 can be directly connected in series or in parallel or mixed together, and then the whole formed by the plurality of battery packs 10 can be accommodated in the box; A battery module is formed in parallel or in a mixed connection, and a plurality of battery modules are connected in series or in parallel or in a mixed connection to form a whole, and are accommodated in the battery pack 10 . The battery pack 10 may further include other structures. For example, the battery pack 10 may further include a bus component for realizing electrical connection between the plurality of battery modules 21 .

Wherein, each battery module 21 may be a lithium-ion secondary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery module 21 can be in the form of a cylinder, a flat body, a rectangular parallelepiped, or other shapes.

According to some embodiments of the present application, reference is made to Figures 2-8. The present application also provides a battery pack 10 . The battery pack 10 includes a box body 1 , an upper and lower two-layer module assembly 2 and a cooling assembly 3 .

An accommodating cavity 11 is formed inside the box body 1 ; the module assembly 2 is arranged in the accommodating cavity 11 , and the cooling assembly 3 is arranged between the two layers of the module assemblies 2 . Cover plates 4 are provided on both sides of the box body 1 , wherein the electrode columns of the upper and lower module assemblies 2 are facing the adjacent cover plates 4 respectively. The cover plates 4 can be made of aluminum alloy materials or multi-layer composite plates.

The box body 1 is provided with a water cooling interface 12, a high and low pressure connector interface 13 and a balanced explosion-proof valve 14. The high and low pressure connector interface 13 and the balanced explosion-proof valve 14 can be adjusted in two positions according to actual needs. The box body 1 is made of aluminum alloy material and extrusion molding process. Space can be reserved in the box 1 for installing the battery management system BMS, such as CMC, BMU and high voltage box.

The module assembly 2 includes a plurality of modules 21 and a locking structure 22. The modules 21 are fixed in the accommodating cavity 11 in the box body 1 through the locking structure 22, wherein the locking structure 22 can be specified on the box body 1 by laser welding. inside the accommodating cavity 11, and lock the module 21 on the locking structure 22, a gap is set between the cover 4 and the module 21, and the gap between the module 21 and the cover 4 can make the module 21 is not in contact with the cover plate 4. When the cover plate 4 is squeezed and deformed, the deformation of the cover plate 4 can be reduced, and the force transmitted to the module 21 can be greatly reduced, which will reduce the battery pack 10. Failure caused by force such as bottom scratching, impact, etc. A protective layer is arranged in the gap, and the protective layer can be made of mica plate to prevent the cover plate 4 from being burned through when the module 21 is thermally out of control;

The module 21 includes an end plate 211 , a side plate 212 , a cantilever beam 213 , a plurality of battery cells 214 , a flanging plate 215 , a heat insulating pad 216 and an insulating cover 217 . For stabilizing the cells 214 on the cooling assembly 3 , two adjacent cells 214 are provided with heat insulation pads 216 , and an insulating cover 217 is provided between the end plates 211 and the cells 214 ; the side plates 212 can press the cells 214 , to prevent the battery cell 214 from moving during the vibration and impact process, and to ensure good contact between the battery core 214 and the cooling assembly 3 .

The locking structure 22 includes a beam 221 and a longitudinal beam 222 arranged on the side wall of the beam 221 . The beam 221 and the longitudinal beam 222 are welded on the inner wall of the accommodating cavity 11 of the box body 1 by laser welding. The height of the beam 221 is greater than that of the module 21 The height of the module 21 can form a gap between the module 21 and the cover plate 4; the end plate 211 of the module 21 is extended with a cantilever beam 213, which is locked to the longitudinal beam 222 by bolts. Wherein, the side plate 212 of the module 21 can be extended with a cantilever beam 213 as required, and is locked on the beam 221 by bolts. When the modules 21 are placed in a 2*3 arrangement, in this arrangement, the end plates 211 and the side plates 212 of the module 21 are both extended with cantilever beams 213 and locked to the longitudinal beams 222 respectively. and the beam 221; when the module 21 is placed in a 1*3 arrangement, in this arrangement, the beam 221 can be eliminated, and the end plate 211 of the module 21 is extended with cantilever beams 213, which are respectively locked on the longitudinal beam 222.

The cooling assembly 3 includes a water cooling plate 31 and a water cooling joint 32 , the water cooling plate 31 is arranged between the two adjacent layers of the module assemblies 2 , the water cooling joint 32 is arranged on the water cooling plate 31 , and the water cooling joint 32 passes through the water cooling interface 12 . The side of the water-cooling plate 31 close to the module assembly 2 is thermally conductive through thermal pads, thermally conductive silicone grease or thermally conductive structural adhesive.

It is to be understood that the embodiments disclosed herein are not limited to the specific process steps or materials disclosed herein, but should extend to equivalents of such features as would be understood by those of ordinary skill in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not meant to be limiting.

Reference in the specification to "an embodiment" means that a particular feature, or characteristic, described in connection with the embodiment is included in at least one embodiment of the present application. Thus, appearances of the phrase or "an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment.

Furthermore, the described features or characteristics may be combined in any other suitable manner in one or more embodiments. In the above description, some specific details, such as thicknesses, numbers, etc., are provided in order to provide a thorough understanding of the embodiments of the present application. However, one skilled in the relevant art will understand that the present application may be practiced without one or more of the specific details described above or may be practiced with other methods, components, materials, etc.

Claims (18)

1. A battery pack, comprising:

a box body (1) with an accommodating cavity (11) formed inside;

and the plurality of layers of module assemblies (2) are arranged in the accommodating cavity (11), and a cooling assembly (3) is arranged between every two adjacent layers of module assemblies (2).

2. The battery pack according to claim 1, wherein the cooling assembly (3) includes a water-cooling plate (31), the water-cooling plate (31) being disposed between two adjacent layers of the module assembly (2).

3. The battery pack according to claim 1 or 2, wherein the module assembly (2) comprises a locking structure (22) and a plurality of modules (21), and each module (21) is fixed in the accommodating cavity (11) in the case (1) through the locking structure (22).

4. A battery pack according to claim 3, wherein the locking structure (22) comprises a longitudinal beam (222), and the module (21) has an end plate (211), the end plate (211) being locked to the longitudinal beam (222).

5. A battery pack according to claim 3, wherein the locking structure (22) comprises a cross member (221), and a longitudinal member (222) provided on a side wall of the cross member (221), and the module (21) has an end plate (211), and the end plate (211) is locked to the longitudinal member (222).

6. Battery pack according to claim 5, characterized in that the modules (21) have side plates (212), the side plates (212) being locked onto the cross-beam (221).

7. The battery pack according to claim 5, wherein the cross member (221) and the longitudinal member (222) are perpendicular to each other.

8. Battery pack according to claim 5, characterized in that the height of the cross-beam (221) is greater than the height of the modules (21).

9. Battery pack according to claim 6, characterized in that the height of the longitudinal beams (222) is greater than the height of the modules (21).

10. Battery pack according to claim 4 or 5, characterized in that the end plate (211) is extended with a cantilever beam (213), the cantilever beam (213) being locked to the longitudinal beam (222).

11. The battery pack according to claim 6, wherein the side plate (212) is extended with a cantilever beam (213), and the cantilever beam (213) is locked on the cross beam (221).

12. The battery pack according to claim 6, characterized in that the side plates (212) are provided with a flanging plate (215), the flanging plate (215) being used for stabilizing the battery cell (214) on the cooling assembly (3).

13. The battery pack according to claim 2, wherein the water-cooling plate (31) is thermally conductive on the side close to the module assembly (2) by a thermal pad, a thermal grease or a thermal structural adhesive.

14. The battery pack according to claim 2, wherein the water cooling plate (31) is provided with a water cooling joint (32), the box body (1) is provided with a water cooling interface (12) corresponding to the position of the water cooling joint (32), and the water cooling joint (32) penetrates through the water cooling interface (12).

15. A battery pack as claimed in claim 3, wherein cover plates (4) are provided on both sides of the case (1), and a gap is provided between the cover plates (4) and the modules (21).

16. The battery pack of claim 15, wherein a protective layer is disposed within the gap.

17. A battery pack according to claim 15, wherein the electrode posts of the modules (21) are each directed towards its adjacent cover plate (4).

18. An electrical device comprising a battery pack (10) according to any one of claims 1-17, the battery pack (10) being adapted to provide electrical energy.

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