CN113871753A

CN113871753A - Battery pack

Info

Publication number: CN113871753A
Application number: CN202111122280.XA
Authority: CN
Inventors: 李秭泷; 何亚飞; 其他发明人请求不公开姓名
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2021-12-31

Abstract

The invention belongs to the technical field of batteries, and discloses a battery pack which comprises a shell, a battery module and a spraying assembly, wherein the battery pack is provided with an accommodating cavity, the battery module and the spraying assembly are both arranged in the accommodating cavity, and when a battery core is out of control due to heat, the spraying assembly can spray cooling liquid for the battery module, so that the temperature of the battery core is reduced, the spreading of the out of control due to heat is delayed, and further out of control due to heat is avoided; the shell comprises a shell body and a shell cover, the shell cover is arranged on the shell body to form an accommodating cavity, and the shell is convenient to disassemble and assemble and easy to maintain the battery pack.

Description

Battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a battery pack.

Background

Along with the development of new energy automobiles, the demand for power batteries is continuously increased, and meanwhile, the performance requirements for the power batteries are also continuously increased, generally, a power battery pack is composed of a plurality of battery modules, the battery modules are composed of a plurality of battery cells, the battery cells in the battery modules generally adopt square-shell battery cells or soft-package battery cells, and because the outside of the soft-package battery cells are coated by aluminum-plastic films, compared with the square-shell battery cells (aluminum shells or steel shells), the soft-package battery cells are weaker in structure, and therefore the battery modules need to be protected by an outer frame of the battery modules; in the use of battery package, the battery core in the battery module can take place thermal runaway because of circumstances such as extrusion, short circuit, can cause the battery package even new energy automobile to take place spontaneous combustion.

In order to reduce the influence caused by thermal runaway, the conventional power battery pack is often provided with an explosion-proof valve on a battery module, and when the thermal runaway occurs, hot vapor generated by a battery core can be directionally discharged through the explosion-proof valve, so that the influence of the thermal runaway is reduced; however, the explosion-proof valve is only used for delaying the fire starting speed of the battery pack, and the fire of the battery pack cannot be completely stopped.

Disclosure of Invention

The invention aims to provide a battery pack to improve the safety of the battery pack.

In order to achieve the purpose, the invention adopts the following technical scheme:

the present invention provides a battery pack, including:

the shell comprises a lower shell body and a shell cover, and the shell cover is arranged on the lower shell body to form an accommodating cavity;

the battery module is arranged in the accommodating cavity; and

and the spraying assembly is arranged in the accommodating cavity and is used for spraying cooling liquid for the battery module.

Preferably, the battery module includes:

the module outer frame comprises a first outer frame and a second outer frame, and the first outer frame can be covered on the second outer frame to form a containing groove;

the two groups of electric core assemblies are accommodated in the accommodating groove and are arranged along the vertical direction; and

and the water cooling plate is accommodated in the accommodating groove and clamped between the two groups of the electric core assemblies, and a cooling channel is arranged in the water cooling plate.

Preferably, the battery pack further includes a cooling pipe assembly including:

the water outlet of the water inlet pipe is communicated with the water inlet of the water cooling plate; and

and the water inlet of the water outlet pipe is communicated with the water outlet of the water cooling plate.

Preferably, the spraying assembly comprises a plurality of groups of spraying heads, and the plurality of groups of spraying heads are communicated with the water inlet pipe or the water outlet pipe.

Preferably, the plurality of groups of spray headers are arranged at intervals along the length direction of the water inlet pipe or the water outlet pipe.

Preferably, the spray assembly further comprises a plurality of sets of temperature triggers, and the temperature triggers are used for controlling the corresponding spray headers to spray cooling liquid.

Preferably, the battery pack further comprises a high-voltage power distribution assembly, the high-voltage power distribution assembly comprises a shell, a battery management system and a high-voltage power distribution unit, and the battery management system and the high-voltage power distribution unit are arranged in the shell.

Preferably, the housing includes a bottom case and an upper cover capable of covering the bottom case, wherein

The bottom case includes a main body and a support portion disposed along a circumferential direction of an opening of the main body,

the shell cover is provided with a through hole, the main body can penetrate through the through hole, and the supporting portion can be supported on the opening of the main body.

Preferably, the battery core assembly comprises a plurality of groups of battery cores and a bus bar, the plurality of groups of battery cores are stacked, and the plurality of groups of battery cores are electrically connected with the battery management system and/or the high-voltage power distribution unit through the bus bar.

Preferably, the housing and the module outer frame are provided with reinforcing structures.

The invention has the beneficial effects that:

the battery pack comprises a shell, a battery module and a spraying assembly, wherein the battery pack is provided with an accommodating cavity, the battery module and the spraying assembly are both arranged in the accommodating cavity, and when the battery core is out of control due to heat, the spraying assembly can spray cooling liquid for the battery module, so that the temperature of the battery core is reduced, the spread of the out of control due to heat is delayed, and further out of control due to heat is avoided; the shell includes casing and cap down, and on the casing was located to the cap lid to form the holding chamber, this shell be convenient for the dismouting, the maintenance of easy battery package.

Drawings

Fig. 1 is a schematic view of a battery pack according to the present invention;

fig. 2 is an exploded view of a battery pack according to the present invention;

fig. 3 is an exploded view of a battery module according to the present invention;

FIG. 4 is a schematic view of a cooling circuit assembly according to the present invention;

FIG. 5 is a schematic view of a spray assembly according to the present invention;

fig. 6 is a schematic diagram of a high voltage power distribution assembly in accordance with the present invention.

Reference numerals:

1. a housing; 2. a battery module; 3. a spray assembly; 4. cooling the pipeline assembly; 5. a high voltage power distribution assembly;

11. a lower housing; 12. a shell cover; 21. a module outer frame; 22. an electrical core assembly; 23. a water-cooling plate; 31. a shower head; 32. a temperature trigger; 41. a water inlet pipe; 42. a water outlet pipe; 51. a bottom case; 52. an upper cover; 53. a battery management system; 54. a high voltage power distribution unit;

211. a first outer frame; 212. a second outer frame; 121. a through hole; 511. a main body; 512. a support portion.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The present embodiment provides a battery pack, as shown in fig. 1 and 2, including a housing 1, a battery module 2, and a shower assembly 3. The battery package is provided with the holding chamber, and battery module 2 and spray assembly 3 all set up in the holding intracavity. When electric core emergence thermal runaway, spray assembly 3 can spray the coolant liquid for battery module 2, from reducing electric core temperature, delays stretching of thermal runaway, and then avoids taking place further thermal runaway. In addition, the cooling liquid that sprays can also cool off thermal runaway exhaust flue gas, prevents that battery package high temperature flue gas blowout battery package from catching fire outward to the cooling liquid that sprays can also reduce the risk that harmful substance leaks under the thermal runaway, has played certain ground dust fall effect. The housing 1 includes a lower case 11 and a case cover 12, and the case cover 12 is disposed on the lower case 11 to form an accommodation chamber. The shell 1 is convenient to disassemble and assemble and easy to maintain the battery pack.

As shown in fig. 3, the battery module 2 includes a module outer frame 21, two sets of core assemblies 22, and a water-cooling plate 23, wherein the module outer frame 21 is provided with a receiving groove. Preferably, the module frame 21 includes a first frame 211 and a second frame 212, and the first frame 211 can cover the second frame 212 to form a receiving groove. The two sets of electric core assemblies 22 are accommodated in the accommodating groove, and the two sets of electric core assemblies 22 are arranged along the vertical direction. The water cooling plate 23 is accommodated in the accommodating groove, and the water cooling plate 23 is clamped between the two sets of cell assemblies 22. And a cooling channel is arranged in the water-cooling plate 23 to cool and radiate the upper and lower groups of electric core assemblies 22.

As can be seen from the figure, the water-cooling plate 23 can be used as a module base plate of two sets of electric core assemblies 22, which can save one set of water-cooling plate 23 compared with the original design, and two module base plates, the cost is reduced compared with the conventional scheme, and the internal space of the battery module 2 is saved. Under the same battery module 2 inner space, battery module 2 in this embodiment can hold more electric cores, has increased the energy density of battery package indirectly. In addition, the water cooling plate 23 in this embodiment is extruded, so that the overall structural strength of the module is high.

It should be noted that the electric core assembly 22 and the water cooling plate 23 in this embodiment are welded together, and no heat conducting glue or structural glue is used to adhere to the water cooling plate 23, so that the cost is reduced, and the maintenance of the electric core assembly 22 is facilitated.

In order to circulate the cooling fluid in the water cooling plate 23, the battery pack is further provided with a cooling pipeline assembly 4, as shown in fig. 4. The cooling pipeline assembly 4 comprises a water inlet pipe 41 and a water outlet pipe 42, wherein the water outlet of the water inlet pipe 41 is communicated with the water inlet of the water cooling plate 23, the water inlet of the water outlet pipe 42 is communicated with the water outlet of the water cooling plate 23, and the other ends of the water inlet pipe 41 and the water outlet pipe 42 are communicated with a cooling liquid circulating device.

Specifically, the spray assembly 3 includes a plurality of sets of spray headers 31, and the plurality of sets of spray headers 31 are communicated with the water inlet pipe 41 or the water outlet pipe 42. In the present embodiment, one half of the spray headers 31 are communicated with the water inlet pipe 41, the other half of the spray headers 31 are communicated with the water outlet pipe 42, and the plurality of groups of spray headers 31 are arranged at intervals along the length direction of the water inlet pipe 41 or the water outlet pipe 42, so that the plurality of groups of spray headers 31 can spray the cooling liquid to different positions of the battery module 2.

In order to facilitate the control of the spraying of the spray headers 31, the spray assembly 3 is further provided with a plurality of sets of temperature triggers 32 (see fig. 5), and the temperature triggers 32 can control the corresponding spray headers 31 to spray the cooling liquid. When the battery core in the battery pack is out of control due to heat, the temperature trigger 32 is triggered, and the cooling liquid can be sprayed out from the spray header 31, so that the temperature of the battery pack is reduced.

Alternatively, the temperature trigger 32 may employ a heat sensitive element similar to a fire sprinkler. When the heat sensitive element is heated, the heat sensitive liquid in the heat sensitive element expands rapidly, so that the shell 1 of the heat sensitive element is broken, and the cooling liquid in the water inlet pipe 41 or the water outlet pipe 42 is sprayed out from the spray head 31.

Optionally, the temperature trigger 32 and the showerhead 31 are integrally formed.

As shown in fig. 6, the battery pack further includes a high voltage power distribution assembly 5. The high voltage power distribution assembly 5 includes a housing, a battery management system 53 and a high voltage power distribution unit 54, both the battery management system 53 and the high voltage power distribution unit 54 being disposed within the housing.

Preferably, the case includes a bottom case 51 and an upper cover 52, and the upper cover 52 can be covered on the bottom case 51. The bottom case 51 includes a main body 511 and a support portion 512, and the support portion 512 is disposed along an opening circumference of the main body 511. The cover 12 is provided with a through hole 121, and the main body 511 can pass through the through hole 121 so that the housing at least partially protrudes from the housing 1. The support portion 512 can be supported by the opening of the main body 511. Because the high-voltage power distribution unit 54 and the battery management system 53 in this embodiment are both disposed in the casing of the high-voltage power distribution assembly 5, and the casing is at least partially disposed outside the casing 1 of the battery pack, when the high-voltage power distribution unit 54 and the battery management system 53 are abnormal and need to be detected and replaced, the abnormal parts can be detected and replaced without opening the casing 1 of the battery pack, thereby reducing the maintenance cost.

Preferably, the battery pack assembly 22 includes a plurality of sets of battery cells stacked together and a busbar by which the plurality of sets of battery cells are electrically connected to the battery management system 53 and/or the high voltage power distribution unit 54.

In order to enhance the strength of the module outer frame 21 of the battery pack case 1 and the battery module 2, the present embodiment provides a reinforcing structure on both the case 1 and the module outer frame 21. Preferably, the housing 1 and the module housing 21 may be formed by extrusion or punching, and in order to enhance the strength of the structure, protrusions may be extruded or punched on the housing 1 and the module housing 21 during the forming process to serve as the reinforcing structure.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery pack, comprising:

the shell (1), the shell (1) comprises a lower shell (11) and a shell cover (12), and the shell cover (12) is arranged on the lower shell (11) in a covering mode to form an accommodating cavity;

the battery module (2), the said battery module (2) is set up in the said holding cavity; and

the spraying assembly (3) is arranged in the accommodating cavity, and the spraying assembly (3) is used for spraying cooling liquid for the battery module (2).

2. The battery pack according to claim 1, wherein the battery module (2) comprises:

the module outer frame (21), the module outer frame (21) includes the first outer frame (211) and the second outer frame (212), the first outer frame (211) can cover the second outer frame (212), so as to form a containing groove;

the two groups of electric core assemblies (22), the two groups of electric core assemblies (22) are accommodated in the accommodating groove, and the two groups of electric core assemblies (22) are arranged along the vertical direction; and

the water cooling plate (23) is contained in the containing groove and clamped between the two groups of the electric core assemblies (22), and a cooling channel is arranged in the water cooling plate (23).

3. The battery pack according to claim 2, further comprising a cooling duct assembly (4), the cooling duct assembly (4) comprising:

the water outlet of the water inlet pipe (41) is communicated with the water inlet of the water cooling plate (23); and

and a water inlet of the water outlet pipe (42) is communicated with a water outlet of the water cooling plate (23).

4. The battery pack according to claim 3, wherein the shower assembly (3) comprises a plurality of groups of shower heads (31), the plurality of groups of shower heads (31) being in communication with the inlet pipe (41) or the outlet pipe (42).

5. The battery pack according to claim 4, wherein the plurality of groups of shower heads (31) are arranged at intervals along the length direction of the water inlet pipe (41) or the water outlet pipe (42).

6. The battery pack according to claim 4, wherein the spray assembly (3) further comprises a plurality of sets of temperature triggers (32), the temperature triggers (32) being configured to control the corresponding spray header (31) to spray the cooling liquid.

7. The battery pack of claim 1, further comprising:

high voltage distribution subassembly (5), high voltage distribution subassembly (5) include casing, battery management system (53) and high voltage distribution unit (54), battery management system (53) with high voltage distribution unit (54) all set up in the casing.

8. The battery pack according to claim 7, wherein the case includes a bottom case (51) and an upper cover (52), the upper cover (52) being capable of being provided to the bottom case (51), wherein

The bottom case (51) includes a main body (511) and a support portion (512), the support portion (512) being disposed circumferentially along an opening of the main body (511),

the shell cover (12) is provided with a through hole (121), the main body (511) can penetrate through the through hole (121), and the supporting part (512) can be supported on the opening of the main body (511).

9. The battery pack of claim 7, wherein the cell assembly (22) comprises a plurality of sets of cells stacked together and a busbar by which the plurality of sets of cells are electrically connected to the battery management system (53) and/or the high voltage power distribution unit (54).

10. The battery pack according to claim 2, wherein the housing (1) and the module outer frame (21) are each provided with a reinforcing structure.