CN215816021U - Battery pack - Google Patents

Abstract

The utility model is suitable for the field of power batteries, and provides a battery pack which comprises a box body, a battery module and a liquid cooling plate, wherein the battery module and the liquid cooling plate are arranged in the box body; the battery pack further comprises a fireproof layer arranged in the extension area. According to the battery pack provided by the utility model, the fireproof layer is arranged at the epitaxial region of the liquid cooling plate, so that the fireproof performance of the liquid cooling plate is enhanced, and the use safety of the battery pack is further improved.

Description

Battery pack

Technical Field

The utility model belongs to the field of power batteries, and particularly relates to a battery pack.

Background

The liquid cooling plate is commonly used in the battery pack to carry out heat management on the battery module. The liquid cooling plate is arranged in the box body of the battery pack and is abutted to the battery module. The liquid cooling plate is internally provided with a flow channel for liquid cooling medium to flow, the liquid cooling medium enters the flow channel from a liquid inlet of the liquid cooling plate and exchanges heat with the battery module while flowing in the flow channel, so that the temperature of the battery module is adjusted, and finally the liquid cooling plate leaves from a liquid outlet of the liquid cooling plate.

In actual structure, the battery module includes a plurality of electric cores, and each electric core is arranged in order and forms the main part of battery module, and the electric core is the source that generates heat of battery package. The battery cell is fixedly connected into a whole through the brackets positioned at two sides. The liquid cooling plate comprises a part covering the battery core and an epitaxial part. The liquid cooling plate is thicker at the part covering the electric core and is internally provided with a flow channel for flowing liquid cooling media, and the extension part is thinner and is not provided with the flow channel. When the electric core is out of control thermally, the extension part is a weak area and is easy to burn through at high temperature to cause safety accidents.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to overcoming the above-mentioned disadvantages of the prior art, and provides a battery pack, which is intended to improve the safety of the battery pack.

In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

a battery pack comprises a box body, a battery module and a liquid cooling plate, wherein the battery module and the liquid cooling plate are arranged in the box body, and the surface of the liquid cooling plate, facing the battery module, is provided with a liquid cooling area abutted against the battery module and an epitaxial area deviated from the battery module; the battery pack further comprises a fireproof layer arranged in the extension area.

Through adopting above-mentioned technical scheme, the inside of the epitaxial portion of liquid cooling plate does not have the liquid cooling medium, and is generally thinner, takes place when thermal runaway at electric core, is burnt through easily. One side of the extension portion towards the battery module is provided with a fireproof layer, so that the fireproof performance of the liquid cooling plate is enhanced, and the use safety of the battery pack is further improved.

Optionally, the battery module includes a plurality of electric cores of arranging in order, electric core is equipped with utmost point ear in its length direction's both sides, the flame retardant coating covers at least epitaxial district is in electric core length direction's both sides.

Through adopting above-mentioned technical scheme, correspond in electric core in the both sides at utmost point ear place and set up the flame retardant coating, can effectively improve the fire behavior of liquid cooling board in this region, and then improve the safe in utilization of battery package.

Optionally, the fire-proof layer covers the extension area in the internal space range of the box body.

Through adopting above-mentioned technical scheme, epitaxial region is shielded by the flame retardant coating and does not have the exposed area, and avoids the not enough and burnt condition of wearing of local position fire behavior, and the safety in utilization of at utmost guarantee battery package.

Optionally, the fire-proof layer is made of aerogel or ceramic fiber felt.

Through adopting above-mentioned technical scheme, adopt aerogel or ceramic fibre felt as the material of flame retardant coating, can satisfy the fire-retardant requirement of flame retardant coating.

Optionally, the battery pack includes two liquid cooling plates, and the two liquid cooling plates are respectively located on two opposite sides of the battery module.

Through adopting above-mentioned technical scheme, the design in single liquid cold drawing is compared in the setting of two liquid cold boards, and this setting can increase substantially the heat exchange efficiency of battery module, and when especially quick charge, can realize quick radiating effect. In addition, the upper side and the lower side of the battery module are respectively provided with the liquid cooling plate, so that the temperature gradient difference and the highest temperature value of the battery module in the vertical direction can be reduced, and the service life of the battery module can be prolonged.

Optionally, a heat insulation layer is arranged in the box body, and the heat insulation layer is arranged on one side, deviating from the battery module, of the liquid cooling plate.

Through adopting above-mentioned technical scheme, the setting of insulating layer improves the thermal-insulated heat preservation effect of box, and is favorable to reducing the required energy consumption of battery package temperature management, reaches energy-conserving effect.

Optionally, the box body comprises an upper cover, a side plate and a bottom plate, and the upper cover, the side plate and the bottom plate are enclosed to form an accommodating cavity for accommodating the battery module and the liquid cooling plate; the upper cover and/or the bottom plate are/is made of heat insulation materials.

Through adopting above-mentioned technical scheme, the rigid support and the thermal-insulated function of battery package are undertaken simultaneously to upper cover and bottom plate, and this setting makes upper cover and the integrative setting of insulating layer of locating the holding chamber upper chamber wall, for single structure spare, the bottom plate with locate the holding chamber under the insulating layer of chamber wall integrative setting, for single structure spare, and then can reduce the thickness of battery package in upper and lower direction. In other words, under the condition that the overall height of the battery pack is fixed, the accommodating space of the battery cell can be increased, so that the electric quantity of the battery pack is improved, and the cruising ability is improved.

Optionally, the upper cover and/or the bottom plate are made of glass fiber reinforced plastic or carbon fiber materials.

By adopting the technical scheme, the upper cover and the bottom plate are made of glass fiber reinforced plastic or carbon fiber materials, so that the structural strength requirement and the heat preservation requirement of the upper cover and the bottom plate can be met.

Optionally, the two liquid cooling plates are detachably connected with the upper cover and the bottom plate respectively.

Through adopting above-mentioned technical scheme, the upper cover can be dismantled with the liquid cooling board that is located the top and be connected, and the bottom plate can be dismantled with the liquid cooling board that is located the below and be connected, when upper cover, bottom plate or liquid cooling board damage, can tear open alone and trade to reduce the use cost of battery package.

Optionally, a heat conducting glue is arranged between the battery module and the liquid cooling plate.

Through adopting above-mentioned technical scheme, the setting of heat conduction glue, on the one hand the heat conduction glue has outstanding heat conduction material, can realize the heat transfer between electric core and the liquid cooling board, and on the other hand, the heat conduction glue is flexible material, is pressed from both sides and is located between electric core and the liquid cooling board and can absorb the plane degree tolerance between electric core and the liquid cooling board, avoids having the reduction of the heat transfer effect that the air gap brought between electric core and the liquid cooling board.

Optionally, the battery module is fixedly connected with the box body through a bolt.

Through adopting above-mentioned technical scheme, the assembly operation of battery module and box is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first schematic diagram of a battery pack according to an embodiment of the present invention;

fig. 2 is a second schematic diagram of a battery pack according to an embodiment of the utility model;

fig. 3 is a third schematic diagram of a battery pack according to an embodiment of the utility model;

fig. 4 is a fourth schematic diagram of the battery pack according to the embodiment of the utility model.

Wherein, in the figures, the respective reference numerals:

11. an upper cover; 12. a side plate; 121. connecting blocks; 13. a base plate; 20. a battery module; 30. a liquid-cooled plate; 31. a liquid cooling section; 32. an extension portion; 40. a fire barrier layer; 21. a bolt; 50. heat conducting glue; 60. a gasket; 70. an insulating layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.

Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to 4, a battery pack provided in the present application will now be described.

The battery pack includes a case, and a battery module 20 and a liquid cooling plate 30 provided in the case. The case includes an upper cover 11, a bottom plate 13, and side plates 12. The box body is roughly in a cuboid shape, and an upper cover 11, a bottom plate 13 and side plates 12 are enclosed to form an accommodating cavity. The upper cover 11 and the bottom plate 13 are arranged up and down, and the four side plates 12 are sequentially connected and positioned between the upper cover 11 and the bottom plate 13. The bottom plate 13 and the side plate 12 are welded and connected into a whole, and the upper cover 11 and the side plate 12 are fixedly connected through bolts. Referring to fig. 1 or fig. 2, a sealing gasket 60 is disposed at a connection portion between the upper cover 11 and the side plate 12. The sealing gasket 60 not only realizes the sealing function of the upper cover 11 and the side plate 12, but also realizes the airtight and heat insulation effect of the accommodating cavity.

The battery module 20 and the liquid cooling plate 30 are disposed in the receiving cavity.

In this embodiment, the battery module 20 is fixed to the case by bolts 21. Specifically, referring to fig. 1, a connecting block 121 is convexly disposed on the side plate 12 of the case, and the bolt 21 penetrates through the battery module 20 and is fixedly connected to the connecting block 121. The spiro union is for dismantling the connected mode, compares in the undetachable connected mode such as welding, can facilitate the assembly operation of battery module 20 and box.

The liquid cooling plate 30 is used to adjust the temperature of the battery module 20 so that the battery module 20 is within a designed temperature range for use. The outer surface of the liquid cooling plate 30 abuts against the battery module 20. It should be noted that the liquid cooling plate 30 may be directly abutted against the battery module 20, or may be indirectly abutted against the battery module via the heat conductive adhesive 50 or other heat conductive medium.

The liquid cooling plate 30 is made of a common high-strength extruded aluminum profile, a flow channel for flowing of a liquid cooling medium is arranged in the liquid cooling plate 30, and the liquid cooling medium can be water, glycol mixed liquid or other liquid with high specific heat capacity. The liquid cooling medium enters the flow channel from the liquid inlet of the liquid cooling plate 30, and exchanges heat with the battery module 20 while flowing in the flow channel, so that the temperature of the battery module 20 is adjusted, and finally the liquid cooling plate 30 is separated from the liquid outlet of the liquid cooling plate 30.

In this embodiment, the liquid cooling plate 30 has a liquid cooling region abutting against the battery module 20 and an extension region deviating from the battery module 20 on the surface facing the battery module 20, and the battery pack further includes a fireproof layer 40 disposed in the extension region.

The liquid cooling plate 30 is provided between the battery module 20 and the case. In the structure shown in fig. 1, the two liquid-cooled plates 30 are provided at the upper and lower sides of the battery module 20. In the structure shown in fig. 2, one liquid-cooled plate 30 is provided and located above the battery module 20. In the structure shown in fig. 3, one liquid-cooled plate 30 is provided and located below the battery module 20. The construction shown in fig. 4 differs from that shown in fig. 1 in that a heat insulating layer 70 is provided in the box body, and the heat insulating layer 70 includes heat insulating members provided on the lower surface of the upper cover 11 and the upper surface of the bottom plate 13. The setting of two upper and lower liquid cooling boards 30 compares in the design of single liquid cooling board 30, can increase substantially the heat exchange efficiency of battery module 20, and when especially quick charge, can realize quick radiating effect. In addition, the upper and lower both sides of battery module 20 all are equipped with liquid cooling plate 30, are favorable to reducing battery module 20 temperature gradient difference and the highest temperature value in upper and lower direction to be favorable to improving battery module 20's life.

Referring to fig. 1, 2, 3 or 4, the liquid cooling plate 30 includes a liquid cooling portion 31 and an extension portion 32, the liquid cooling portion 31 abuts against the battery module 20, a surface of the liquid cooling portion 31 abutting against the battery module 20 is a liquid cooling area, a flow channel for flowing a liquid cooling medium is provided in the liquid cooling portion 31, and the liquid cooling medium flows in the flow channel and adjusts the temperature of the battery module 20. The extension portion 32 is provided on the periphery of the liquid cooling portion 31, the extension portion 32 does not abut against the battery module 20, the surface of the extension portion 32 facing the battery module 20 is an extension region, and the extension region is offset from the battery module 20 means that the extension region does not abut against the battery module 20 directly or abuts against another structure to leave a gap. The extension portion 32 is not provided with a flow channel therein as long as it is used for connecting and fixing the liquid cooling plate 30 to the surrounding structure.

Combine battery module 20's concrete structure, battery module 20 includes a plurality of electric cores, and each electric core is arranged in order and is formed battery module 20's main part, and the electric core is the source that generates heat of battery package. The battery cell is fixed through the supports positioned on the two sides to form a whole. The upper surface and/or the lower surface of the cell abuts against the liquid cooling portion 31 of the liquid cooling plate 30, and the positions of the brackets on both sides of the cell correspond to the extension portions 32 of the liquid cooling plate 30. When the liquid cooling plates 30 have two and are located at the upper and lower sides of the battery module 20, the upper and lower surfaces of the battery core respectively abut against the liquid cooling portions 31 of the two liquid cooling plates 30, and the support corresponds to the extension portions 32 of the two liquid cooling plates 30. Due to the existence of the liquid cooling medium in the liquid cooling part 31, when the battery cell is in thermal runaway, the temperature of the liquid cooling part 31 does not rise rapidly relatively, so that the liquid cooling part 31 is not burnt through. There is not liquid cooling medium in extension portion 32's inside, and generally thinner, but extension portion 32 has set up flame retardant coating 40 towards the surface (extension district) of battery module 20, and when electric core took place thermal runaway, the existence of flame retardant coating 40 prevented that extension district from being burnt through or reduced its probability of being burnt through.

The battery pack provided by the embodiment is provided with the fireproof layer 40 on the surface (extension area) of the extension portion 32 facing the battery module 20, so as to enhance the temperature resistance and fireproof performance of the extension portion 32. The fire-proof layer 40 is made of a fire-proof material. The fireproof material is an existing fireproof material, can be a fireproof plastic material formed by co-injection molding of glass fiber, calcium carbonate and resin, can also be solvent-based paint composed of chlorinated rubber, paraffin and various fireproof additives, and the like, and is not limited herein.

By last, the battery package that this embodiment provided is equipped with flame retardant coating 40 in the epitaxial district of liquid cooling plate 30, can improve epitaxial portion 32's fire behavior, and the holistic fire behavior of reinforcement liquid cooling plate 30, and then improves the safety in utilization of battery package.

Preferably, the battery cell is provided with tabs at two sides in the length direction of the battery cell, and the fireproof layer 40 at least covers two sides of the extension area in the length direction of the battery cell. It can be understood that the tabs of the cells are connected with the busbar. The current flows through the tabs and the bus bar. When the current exceeds the load, the tab/bus bar is heated and even fused, and the thermal runaway problem of the battery module is further caused. The battery cell is correspondingly provided with the fireproof layers 40 on the two sides of the pole lug, so that the fireproof performance of the liquid cooling plate 30 in the area can be effectively improved, and the use safety of the battery pack is further improved.

In this embodiment, the fire-proof layer 40 covers the extension area in the inner space (i.e. the accommodating cavity) of the box body. Referring to fig. 3, when the liquid cooling plate 30 is entirely located in the accommodating cavity, the epitaxial region is also located in the accommodating cavity, and the epitaxial region is completely covered by the fireproof layer 40. Referring to fig. 2, the extension portion 32 of the liquid cooling plate 30 is partially located in the accommodating cavity and partially sandwiched between the upper cover 11 and the side plate 12, at this time, the fireproof layer 40 completely covers the portion of the extension area in the accommodating cavity, and for the portion sandwiched between the upper cover 11 and the side plate 12, the fireproof layer 40 may be selectively disposed or the fireproof layer 40 may not be selectively disposed. The flame retardant coating 40 covers epitaxial region at box inner space scope completely, in other words, in the holding chamber within range, epitaxial region is shielded by flame retardant coating 40 and does not have the exposed area, and avoids the not enough and condition by the burn-through of local position fire behavior, and the at utmost ensures the safe in utilization of battery package.

The material of the fire-proof layer 40 can be selected from aerogel, ceramic fiber felt and the like.

The fine nano-network structure of the aerogel effectively limits the propagation of local thermal excitation, and the nano-micropores inhibit the contribution of gas molecules to heat conduction. The refractive index of the silica aerogel is close to l, and the ratio of the annihilation coefficients of the silica aerogel to infrared light and visible light is more than 100, so that the silica aerogel can effectively transmit sunlight and prevent infrared heat radiation of ambient temperature, and becomes an ideal transparent heat-insulating material.

The ceramic fiber felt is made by using ceramic fiber cotton produced by resistance melting and blowing fiber forming processes as a main raw material and adopting a vacuum forming process, and is a light and flexible fire-resistant heat-insulating material.

Those skilled in the art can select other fire-proof materials as the fire-proof layer 40 according to actual needs, and the selection is not limited herein.

In another embodiment of the present application, referring to fig. 4, a heat insulation layer 70 is disposed on an inner surface of the box body, and the heat insulation layer 70 is disposed on a side of the liquid cooling plate 30 away from the battery module 20. The arrangement of the heat insulation layer 70 improves the heat insulation effect of the box body, is favorable for reducing the energy consumption required by the temperature management of the battery pack, and achieves the energy-saving effect.

The insulation layer 70 is constituted by at least one insulation element. The heat insulation pieces can be arranged on all the cavity walls of the accommodating cavity, namely, the heat insulation pieces are arranged on the lower surface of the upper cover 11, the upper surface of the bottom plate 13 and the inner surfaces of the side plates 12, the heat insulation pieces are connected to form a heat insulation layer 70, and in this case, a closed accommodating cavity is formed inside the heat insulation layer 70 to strengthen the heat insulation effect. Thermal insulation may be provided partially within the housing, for example only on the lower surface of the lid 11 and the upper surface of the base 13.

The thermal insulation member may be a separate plate member provided on the inner surface of the case, for example, a thermal insulation member is interposed between the upper cover 11 and the upper liquid-cooled plate 30, and a thermal insulation member is interposed between the bottom plate 13 and the lower liquid-cooled plate 30.

The insulation may also be integral with the box structure.

Preferably, the upper cover 11 is made of a material with high strength and good heat insulation performance, in other words, the upper cover 11 simultaneously plays a role of rigid support and heat insulation of the battery pack, and this arrangement enables the upper cover 11 and the heat insulation member arranged on the upper cavity wall of the accommodating cavity to be integrally arranged as a single structural member, thereby reducing the thickness of the battery pack in the vertical direction. In other words, under the condition that the overall height of the battery pack is fixed, the accommodating space of the battery cell can be increased, so that the electric quantity of the battery pack is improved, and the cruising ability is improved. The bottom plate 13 is made of a material with high strength and good heat insulation performance, in other words, the bottom plate 13 simultaneously plays roles of rigid support and heat insulation of the battery pack, and the bottom plate 13 and the heat insulation piece arranged on the lower cavity wall of the accommodating cavity are integrally arranged as a single structural piece, so that the thickness of the battery pack in the vertical direction can be reduced. In other words, under the condition that the overall height of the battery pack is fixed, the accommodating space of the battery cell can be increased, so that the electric quantity of the battery pack is improved, and the cruising ability is improved.

In this embodiment, the upper cover 11 and the bottom plate 13 are made of glass fiber reinforced plastic, carbon fiber or other materials or are formed by compounding.

The glass fiber reinforced plastic is a composite material which takes glass fiber and products thereof (glass cloth, belt, felt, yarn and the like) as reinforcing materials and synthetic resin as matrix materials. The glass fiber reinforced plastic material has light weight, good strength and good heat insulation effect. The glass fiber reinforced plastic can be prepared by using an RTM (Resin Transfer Molding) process. RTM refers to a process technology for flowing, soaking and curing a reinforcing material in a closed mold by low-viscosity resin, and belongs to a liquid forming process in a glass fiber reinforced plastic/composite material forming technology.

The carbon fiber material is high-strength and high-modulus fiber with carbon content of more than 90%. The acrylic fiber and the viscose fiber are used as raw materials and are oxidized and carbonized at high temperature to form the acrylic fiber/viscose fiber composite material. The carbon fiber has the characteristics of high temperature resistance, friction resistance, electric conduction, heat conduction, corrosion resistance and the like, is fibrous and soft in appearance, can be processed into various fabrics, and has high strength and modulus along the fiber axis direction due to the preferred orientation of the graphite microcrystal structure along the fiber axis. The carbon fibers have a low density and thus a high specific strength and a high specific modulus. The carbon fiber material also has the characteristics of high strength and good heat insulation effect, and is high-temperature resistant and the first of all chemical fibers.

The glass fiber reinforced plastic or carbon fiber material is used as the preparation material of the upper cover 11 and the bottom plate 13, so that the strength requirements of the upper cover 11 and the bottom plate 13 can be met, the safety problem caused by the fact that the top or the bottom of the battery pack is hit by a ball can be solved, meanwhile, the requirements of the upper cover 11 and the bottom plate 13 on heat insulation and heat preservation can be met, the stable temperature range can be maintained in the box body, and the energy-saving effect of the battery pack is facilitated.

In another embodiment of the present application, two liquid cooling plates 30 are detachably connected to the upper cover 11 and the bottom plate 13, respectively, and may be screwed or riveted. The upper cover 11 can be dismantled with the liquid cooling board 30 that is located the top and be connected, and the bottom plate 13 can be dismantled with the liquid cooling board 30 that is located the below and be connected, when upper cover 11, bottom plate 13 or liquid cooling board 30 damage, can tear open alone and trade, and other structures can continue to use to reduce the use cost of battery package.

In another embodiment of the present application, referring to fig. 1, fig. 2, fig. 3 or fig. 4, a heat conductive adhesive 50 is disposed between the battery module 20 and the liquid cooling plate 30. The heat conductive adhesive 50 is also called heat conductive silica gel, which is formed by mixing organic silica gel as a main body with polymer materials such as filler, heat conductive material and the like, and has good heat conductive and electrical insulation properties. The heat conductive adhesive 50 is provided, and first, the heat conductive adhesive 50 has excellent high and low temperature resistance and heat conductivity. The heat-conducting glue 50 can resist 300 ℃ high temperature in a short term, 280 ℃ high temperature in a long term and minus 60 ℃ low temperature, and can be suitable for the use environment of the battery pack. The heat conducting glue 50 has excellent heat conducting performance, the heat conducting glue 50 is arranged between the battery cell and the liquid cooling plate 30 to realize heat transfer between the battery cell and the liquid cooling plate 30, high guaranteed heat dissipation coefficient is provided for the battery cell, a guarantee effect is provided for stability of the battery cell in the using process, and the service performance and the service life of the battery cell are improved; secondly, the thermal conductive adhesive 50 can fill the air gap between the battery cell and the liquid cooling plate 30 to further improve the heat transfer effect. In the process of curing the heat-conducting glue 50 in the air, the heat-conducting glue 50 is subjected to condensation reaction through moisture in the air to release low molecules to cause crosslinking curing, and is vulcanized into a high-performance elastomer, and the heat-conducting glue 50 is coated between the battery cell and the liquid cooling plate 30 to absorb the flatness tolerance between the battery cell and the liquid cooling plate 30, so that the reduction of the heat transfer effect caused by the existence of an air gap between the battery cell and the liquid cooling plate 30 is avoided; finally, the heat conducting glue 50 is an electrical insulator, which can ensure the insulation between the battery cell and the liquid cooling plate 30. The assembly of the battery pack provided in this embodiment is described as follows:

preparing an integrated cover body: with liquid cooling plate 30 through spiro union or riveted mode and upper cover 11 fixed connection, this upper cover 11's surface can carry the heat insulating part, then has heat-conducting glue 50 in the liquid cooling district coating of liquid cooling plate 30, covers in epitaxial district and has flame retardant coating 40.

Preparing an integrated box bottom: the bottom plate 13 and the side plates 12 are welded into a whole, the upper surface of the bottom plate 13 can be provided with a heat insulation piece, and the liquid cooling plate 30 is fixed on the upper surface of the bottom plate 13 through a screw connection or riveting mode.

The liquid cooling area of the liquid cooling plate 30 at the bottom of the integrated box is coated with the heat conducting glue 50, and the coating range of the heat conducting glue 50 corresponds to the lower surface of the battery core of the battery module 20. The extension area of the liquid cooling plate 30 is covered with a fireproof layer 40. Then, the battery module 20 is placed on the heat conductive adhesive 50, and the battery module 20 is fixedly connected to the connection block 121 protruding from the side plate 12 through the bolt 21.

After the inspection is correct, the sealing gasket 60 is placed above the side plate 12, the integrated cover body is placed on the battery module 20 in a mode that the heat-conducting glue 50 is right opposite to the battery core, and at the moment, the integrated cover body is pressed on the sealing gasket 60. And (4) locking and fixing the integrated cover body and the integrated box bottom through bolts to complete the assembly of the battery pack.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A battery pack comprises a box body, a battery module and a liquid cooling plate, wherein the battery module and the liquid cooling plate are arranged in the box body;

the battery pack further comprises a fireproof layer arranged in the extension area.

2. The battery pack according to claim 1, wherein the battery module includes a plurality of cells arranged in sequence, the cells are provided with tabs at two sides in a length direction of the cells, and the fireproof layer covers at least two sides of the extension region in the length direction of the cells.

3. The battery pack of claim 1, wherein the fire-blocking layer covers the extent of the extension region within the interior space of the case.

4. The battery pack of claim 1, wherein the fire-blocking layer is made of aerogel or ceramic fiber mat.

5. The battery pack of claim 1, wherein the battery pack comprises two of the liquid-cooled plates, the two liquid-cooled plates being located on opposite sides of the battery module.

6. The battery pack according to claim 1, wherein a heat insulating layer is provided in the case body, and the heat insulating layer is provided on a side of the liquid cooling plate facing away from the battery module.

7. The battery pack of claim 5, wherein the box body comprises an upper cover, side plates and a bottom plate, and the upper cover, the side plates and the bottom plate are enclosed to form an accommodating cavity for accommodating the battery module and the liquid cooling plate; the upper cover and/or the bottom plate are/is made of heat insulation materials.

8. The battery pack of claim 7, wherein the top cover and/or the bottom plate are made of glass fiber reinforced plastic or carbon fiber material.

9. The battery pack of claim 7, wherein two of said fluid cooled plates are removably attached to said top cover and said bottom plate, respectively.

10. The battery pack according to any one of claims 1 to 9, wherein a thermally conductive adhesive is provided between the battery module and the liquid-cooled plate.

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