CN220527057U - Battery pack lower box body and battery pack - Google Patents

Abstract

The utility model relates to a battery pack lower box body and a battery pack, wherein the battery pack lower box body is used for installing a battery module and comprises a lower box body and a heating structure, the lower box body is provided with a liquid flow channel, the liquid flow channel is provided with a liquid inlet and a liquid outlet, and the liquid flow channel is communicated with an external liquid loop through the liquid inlet and the liquid outlet; the heating structure is arranged in the liquid flow channel. The battery pack lower box body has the liquid cooling and heating functions, and the battery pack lower box body with the liquid cooling and heating functions can not only avoid heat concentration of the battery module during heating, but also facilitate operation during dismantling of the battery module.

Description

Battery pack lower box body and battery pack

Technical Field

The utility model relates to the technical field of new energy, in particular to a battery pack lower box body and a battery pack.

Background

Lithium batteries need to be operated at reasonable temperature conditions to ensure their performance. In order to meet reasonable temperature places, a liquid cooling structure is arranged on a lower box of a battery pack, a battery module of the battery pack is cooled through the liquid cooling structure, a heating film is adhered to the side edge of the battery module, and the temperature of the battery module of the battery pack is raised through the heating film. However, the heating film is stuck on the side edge of the battery module, so that the problem that the temperature difference of the battery module is large due to heat concentration is easy to occur, and if the battery module is in failure in the later stage, the heating film on the battery module needs to be dismantled before the battery module is dismantled, so that the operation is complex, and the battery film can interfere with the disassembly and assembly of the battery module.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a battery pack lower case having liquid cooling and heating functions that can not only avoid heat concentration of a battery module when heating but also facilitate operation when removing the battery module.

The utility model provides a battery pack lower box body, which is used for installing a battery module and comprises the following components:

the lower box body is provided with a liquid flow passage, the liquid flow passage is provided with a liquid inlet and a liquid outlet, and the liquid flow passage is communicated with an external liquid loop through the liquid inlet and the liquid outlet; and

and the heating structure is arranged in the liquid flow passage.

In one embodiment, the lower case has an exposed bearing area and a water-receiving and electricity-receiving area, the bearing area is provided with a heat conducting layer, the bearing area is used for installing a battery module, the liquid inlet and the liquid outlet are positioned in the water-receiving and electricity-receiving area, and a wire electrically connected with the heating structure is arranged on a runner wall of the liquid runner, which is positioned in the water-receiving and electricity-receiving area.

In one embodiment, the liquid flow channel comprises a plurality of liquid channels, each liquid channel is communicated with the liquid inlet and the liquid outlet, and the heating structure is arranged in each liquid channel.

In one embodiment, the plurality of liquid channels are arranged in parallel, and the plurality of liquid channels are sequentially communicated and enable the flow path of the liquid flowing through the plurality of liquid channels to be S-shaped.

In one embodiment, two adjacent liquid channels are separated by a first partition, one end of each first partition is provided with a first notch communicated with two adjacent liquid channels, and the first notches of the two adjacent first partitions are positioned at different ends of the two adjacent first partitions, so that the flow path of liquid flowing through a plurality of liquid channels is S-shaped;

the heating structure extends along the length direction of the liquid channel, and the two ends of the heating structure are respectively provided with a second notch, and the two sides of the heating structure are respectively spaced from the inner wall of the liquid channel.

In one embodiment, a plurality of heating structures are arranged in each liquid channel, and the heating structures in each liquid channel are arranged at intervals in parallel along the arrangement direction of the liquid channels; and/or

The heating structure is provided with a frame and heating pieces arranged in the frame, two opening sides of the frame are respectively connected with the inner wall of the liquid channel, the frame is provided with a second partition plate, a third partition plate and two end plates, the second partition plate and the third partition plate are arranged at intervals in parallel and extend along the length direction of the liquid channel, one end plate is connected with one end of the second partition plate and one end of the third partition plate, the other end of the third partition plate is connected with the other end of the second partition plate, and the distance between every two adjacent second partition plates is identical with the distance between every two adjacent second partition plates and the first partition plate.

In one embodiment, the lower box body comprises an outer frame, a lower bottom plate and an upper bottom plate, wherein the lower bottom plate and the upper bottom plate are arranged in the outer frame at intervals in parallel and form a cavity with the outer frame in a surrounding manner;

the cavity is internally provided with a plurality of first partition boards, the first partition boards are arranged in parallel at intervals, two opposite sides of each first partition board are respectively connected with the lower bottom board and the upper bottom board so as to divide the cavity into a plurality of liquid channels, one end of each first partition board is connected with the outer frame, the other end of each first partition board is spaced from the outer frame so as to form a first notch, and the first notches of two adjacent first partition boards are positioned at different ends of two adjacent first partition boards so that the liquid channels are sequentially communicated and the flow paths of liquid flowing through the liquid channels are S-shaped;

the heating structures are arranged in the liquid channels.

In one embodiment, the heating structure is provided with a frame and a heating piece arranged in the frame, two opening sides of the frame are respectively connected with the lower bottom plate and the lower bottom plate, two ends of the frame are respectively spaced from the outer frame to form two second gaps, and two sides of the frame are respectively spaced from the inner wall of the liquid channel.

In one embodiment, the upper base plate is provided with an exposed bearing area and a water receiving and electricity receiving area, the bearing area is provided with a heat conducting layer, the bearing area is used for installing a battery module, the liquid inlet and the liquid outlet are positioned in the water receiving and electricity receiving area, and a wire electrically connected with the heating element is arranged on the water receiving and electricity receiving area in a penetrating manner; and/or

A plurality of heating structures are arranged in each liquid channel, and the heating structures in each liquid channel are arranged at intervals in parallel along the arrangement direction of the first partition plates; and/or

The frame is provided with a second baffle, a third baffle and two end plates, wherein the second baffle and the third baffle are arranged at intervals in parallel and are parallel to the first baffle, one end plate is connected with one end of the second baffle and one end of the third baffle, the other end of the third baffle is connected with the other end of the second baffle, and the distance between every two adjacent second baffles is the same as the distance between every two adjacent second baffles and the first baffle.

The present utility model also provides a battery pack including:

the battery pack lower box body; and

and the battery module is arranged on the lower box body.

The battery pack lower box body has liquid cooling and heating functions, so that a reasonable temperature environment can be provided for a battery module of a battery pack arranged on the battery pack lower box body. For example, after the battery module works for a long time, the temperature of the battery module is increased and is higher than a reasonable temperature due to heat release of the battery module, at the moment, liquid is supplied to the liquid flow channel, and the liquid continuously takes away the heat of the battery module in the flowing process, so that the purpose of reducing the temperature of the battery module is achieved; when the battery module is in a low-temperature environment for a long time (for example, in cold winter), before the battery module is started, the heating structure can be controlled to heat the liquid in the liquid flow channel, and the heated liquid can heat the battery module of the battery pack arranged on the lower box body of the battery pack, so that the purpose of improving the temperature of the battery module is achieved. In the heating process, the heating structure is arranged in the liquid flow channel, so that the heating structure can heat liquid in the liquid flow channel, the battery module is heated through the heated liquid, the heat concentration of the heating structure can be avoided, the problem that the temperature difference of the battery module is large due to the heat concentration can be avoided, the heating structure is arranged in the lower box body, the heating structure is separated from the battery module arranged on the lower box body, and therefore when the battery module fails, the heating structure can not interfere with the dismantling of the battery module and is convenient to dismantle the battery module.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a battery pack according to a preferred embodiment of the present utility model;

fig. 2 is an exploded view of the battery pack shown in fig. 1;

fig. 3 is an exploded view of the lower case of the battery pack shown in fig. 1;

FIG. 4 is a side view of the battery pack shown in FIG. 1;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a partial enlarged view at B in FIG. 5;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 5;

fig. 8 is a partial enlarged view at D in fig. 7.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The utility model discloses a battery pack lower box body and a battery pack. The electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, energy storage equipment, recreation equipment, an elevator, lifting equipment and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, or an electric plane toy, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage and the like; the amusement device may be a carousel, a stair jump machine, or the like. The present application does not particularly limit the above-described power consumption device.

For pure electric vehicles, the battery pack can be used as a driving power supply to replace fossil fuel to provide driving power.

Referring to fig. 1, a battery pack lower case 10 according to a preferred embodiment of the present utility model is used for mounting a battery module 12. As shown in fig. 1 to 5, the battery pack lower case 10 includes a lower case 200 and a heating structure 300. The lower case 200 has a liquid flow passage 210. The liquid flow channel 210 has a liquid inlet 210a and a liquid outlet 210b. The liquid flow passage 210 communicates with an external liquid circuit through a liquid inlet 210a and a liquid outlet 210b. The heating structure 300 is disposed within the liquid flow channel 210.

The lower battery pack case 10 has liquid cooling and heating functions, so that a reasonable temperature environment can be provided for the battery module 12 of the battery pack arranged on the lower battery pack case 10. For example, when the battery module 12 works for a long time, the temperature of the battery module 12 is raised due to heat release of the battery module 12 and is higher than a reasonable temperature, at this time, the liquid is supplied to the liquid flow channel 210, and the liquid continuously takes away the heat of the battery module 12 in the flowing process, so as to achieve the purpose of reducing the temperature of the battery module 12; when the battery module 12 is in a low temperature environment for a long time (for example, in cold winter), before the battery module 12 is started, the heating structure 300 can be controlled to heat the liquid in the liquid flow channel 210, and the heated liquid can heat the battery module 12 of the battery pack arranged on the battery pack lower case 10, thereby achieving the purpose of raising the temperature of the battery module 12. In the above heating process, since the heating structure 300 is disposed in the liquid flow channel 210, the heating structure 300 can heat the liquid in the liquid flow channel 210, and the battery module 12 is heated by the heated liquid, so that the heat concentration of the heating structure 300 can be avoided, and the problem of large temperature difference of the battery module 12 caused by the heat concentration can be avoided, and the heating structure 300 is disposed in the lower case 200, and the heating structure 300 is separated from the battery module 12 disposed on the lower case 200, so that when the battery module 12 fails, the heating structure 300 does not interfere with the removal of the battery module 12 when the battery module 12 is removed, so that the battery module 12 is convenient to be removed.

In this embodiment, as shown in fig. 1-3, the lower case 200 has an exposed carrying area 200a and a water-receiving and power-receiving area 200b. The carrying area 200a is used for mounting the battery module 12. The liquid inlet 210a and the liquid outlet 210b are located in the water receiving area 200b. The wall of the liquid flow channel 210 located in the water-receiving and electric-receiving area 200b is perforated with a conducting wire 300a electrically connected with the heating structure 300, that is, the conducting wire 300a is located in the water-receiving and electric-receiving area 200b. That is, in the present embodiment, the liquid inlet 210a, the liquid outlet 210b and the wires 300a may be spaced apart from the battery module 12. In this way, the battery module 12 can be prevented from interfering with the communication of the liquid inlet 210a and the liquid outlet 210b with the external liquid circuit, and the battery module 12 can be prevented from interfering with the electrical connection of the heating structure 300 with the external power supply through the lead 300a. It is understood that in other embodiments, the liquid inlet 210a, the liquid outlet 210b, and the wires 300a may be located closer to the battery module 12, for example, the liquid inlet 210a and the liquid outlet 210b may be located in the water-receiving and power-receiving region 200b, and the wires 300a are located in the carrying region 200a.

In this embodiment, the carrying region 200a is provided with a thermally conductive layer. In this way, the temperature of the battery module 12 is more easily increased and decreased. It is understood that in other embodiments, the thermally conductive layer may be omitted, in which case heat may be directly conducted through the load bearing region 200a. Specifically, in the present embodiment, the heat conductive layer is formed by applying a heat conductive structural adhesive to the bearing area 200a.

In this embodiment, as shown in fig. 1-5, the liquid flow channel 210 includes a plurality of liquid channels 212. Each liquid channel 212 communicates with a liquid inlet 210a and a liquid outlet 210b. A heating structure 300 is disposed within each of the plurality of liquid channels 212. The channel walls of the plurality of liquid channels 212 are respectively perforated with a wire 300a electrically connected with the heating structure 300. The plurality of liquid channels 212 are provided to facilitate heating and cooling of the battery module 12, and the heating structures 300 are disposed in the plurality of liquid channels 212, so that the heating structures 300 in the plurality of liquid channels 212 can heat at the same time, thereby further avoiding heat concentration. It will be appreciated that in other embodiments, the heating structure 300 may be disposed within a portion of the liquid channels 212, and no heating structure 300 may be disposed within a portion of the liquid channels 212. It will be appreciated that in other embodiments, only one liquid channel 212 may be provided, with a plurality of heating structures 300 being provided in the liquid channel 212.

In the present embodiment, the plurality of liquid passages 212 are arranged in parallel. In this manner, it is very convenient to provide the liquid flow path 210 with a plurality of liquid channels 212. Specifically, in the present embodiment, the plurality of liquid passages 212 are sequentially communicated and can make the flow path of the liquid flowing through the plurality of liquid passages 212S-shaped. The S-shaped flow path is more convenient for heating and cooling the battery module 12, and is formed by a plurality of liquid channels 212 arranged in parallel, thereby being very convenient for forming the S-shaped flow path. It is understood that in other embodiments, the liquid flow channel 210 may not have an S shape, for example, the liquid flow channel 210 may include a total liquid inlet channel and a total liquid outlet channel, a plurality of liquid channels 212 are disposed between the total liquid inlet channel and the total liquid outlet channel (the plurality of liquid channels 212 may be arranged in parallel or not in parallel, the liquid channels 212 may have a straight line shape or may have an S shape or other shapes), and the liquid inlet 210a and the liquid outlet 210b are respectively disposed on the total liquid inlet channel and the total liquid outlet channel.

In the present embodiment, adjacent two liquid passages 212 are partitioned by a first partition 214. One end of each first separator 214 has a first notch 214a communicating with two adjacent liquid flow passages 210. The first notches 214a of the adjacent two first partitions 214 are located at different ends of the adjacent two first partitions 214 such that the flow path of the liquid flowing through the plurality of liquid passages 212 is S-shaped. In this way, it is very convenient to construct an S-shaped flow channel. However, in the above-mentioned S-shaped flow channels, the more the number of the liquid channels 212, that is, the more the number of the first partition plates 214, the longer the length of the S-shaped flow channels, the greater the fluid resistance of the S-shaped flow channels, which is unfavorable for cooling, and the smaller the number of the liquid channels 212, that is, the smaller the number of the first partition plates 214, the shorter the length of the S-shaped flow channels, the shorter the time that the fluid stays in the S-shaped flow channels, which is unfavorable for cooling.

In order to solve the above-mentioned problems, as shown in fig. 5 to 8, a second partition plate 312 parallel to the first partition plate 214 may be provided in the liquid passage 212, and both end portions of the second partition plate 312 have second notches 310a, and both sides of the second partition plate 312 are spaced apart from the inner wall of the liquid passage 212. Thus, the second partition 312 located in the liquid channel 212 may divide the liquid channel 212 into two small channels, the fluid resistance of the two small channels is smaller than the fluid resistance of the two liquid channels 212 (the width of the small channels is the same as the width of the liquid channel 212) (because both ends of the two small channels are communicated through the second notch 310a, and only one end of the two liquid channels 212 is communicated through the first notch 214 a), and the residence time of the liquid in the two small channels is longer than the residence time of the liquid in one liquid channel 212 (the width of the two small channels is the same as the width of one liquid channel 212). Thus, the liquid flow passage 210 of the lower case 200 having the first and second partitions 214 and 312 has a good cooling effect.

In the present embodiment, the second partition 312 is not provided, but the heating structure 300 (wherein the heating structure 300 may include the second partition 312) is provided, and the second partition 312 is replaced with the heating structure 300, that is, in the present embodiment, the heating structure 300 is provided at the position of the second partition 312. Specifically, in the present embodiment, the heating structure 300 extends along the length direction of the liquid channel 212, and both ends of the heating structure 300 have the second notch 310a, and both sides of the heating structure 300 are spaced from the inner wall of the liquid channel 212. Thus, the heating structure 300 disposed in the liquid channel 212 may divide the liquid channel 212 into two small channels, the fluid resistance of the two small channels is smaller than the fluid resistance of the two liquid channels 212 (the width of the small channels is the same as the width of the liquid channel 212) (because both ends of the two small channels are communicated through the second notch 310a, and only one end of the two liquid channels 212 is communicated through the first notch 214 a), and the residence time of the liquid in the two small channels is longer than the residence time of the liquid in one liquid channel 212 (the width of the two small channels is the same as the width of one liquid channel 212). That is, in this embodiment, the heating structure 300 is not only used for heating, but also used for replacing the second partition plate 312 to separate the liquid channel 212 into two small channels, so that the liquid flow channel 210 has a better cooling effect, and compared with the heating structure 300 additionally arranged between the second partition plate 312 and the first partition plate 214, the heating structure 300 is used for replacing the second partition plate 312, so that the occupation of the heating structure 300 on the flow channel space can be reduced, and the liquid flow is more facilitated.

In this embodiment, the heating structure 300 has a frame 310 and a heating element 320 disposed within the frame 310. The two opening sides of the frame 310 are respectively connected to the inner walls of the liquid passage 212. The frame 310 has a second spacer 312, a third spacer 314, and two end plates 316. The second partition 312 and the third partition 314 are arranged in parallel at intervals and extend along the length direction of the liquid passage 212. One end plate 316 connects one end of the second separator plate 312 and the third separator plate 314, and the other end plate 316 connects the other ends of the second separator plate 312 and the third separator plate 314. The pitch of the adjacent two second separators 312 is the same as the pitch between the adjacent second separators 312 and the first separator 214. Wherein both opening sides of the frame 310 are respectively connected to the inner walls of the liquid passage 212, so that the heating structure 300 can directly heat not only the lower case 200 but also the liquid in the liquid passage 212. In this way, in forming the heating structure 300, it is considered that after the third partition plate 314 is added beside the second partition plate 312, two end plates 316 are added at both end portions, respectively, so that a sealed cavity is formed, and the heating element 320 is disposed in the sealed cavity. That is, the heating structure 300 includes the second partition 312 for forming the flow passage, so that not only can the material forming the heating structure 300 be saved, but also the occupation of the flow passage space by the heating structure 300 can be reduced. It is understood that in other embodiments, the heating structure 300 may also include a sealed housing and a heating element 320 disposed within the sealed housing.

In this embodiment, the heating member 320 includes PTC. PTC is more easily installed in the frame 310. Specifically, only one end plate 316 may be installed, then the heating member 320 may be inserted between the second partition 312 and the third partition 314 from the end of the uninstalled end plate 316, and finally the other end plate 316 may be installed. It is understood that in other embodiments, the heating element 320 may also comprise a resistive wire.

In the present embodiment, a plurality of heating structures 300 are provided in each liquid passage 212, and the plurality of heating structures 300 in each liquid passage 212 are arranged at intervals in parallel along the arrangement direction of the plurality of liquid passages 212. In this way, rapid heating is possible. Specifically, in the present embodiment, two heating structures 300 are provided within each liquid passage 212. It is understood that in other embodiments, only one heating structure 300 may be provided per liquid channel 212.

In this embodiment, as shown in fig. 5 to 8, the lower case 200 includes an outer frame 202, a lower chassis 204, and an upper chassis 206. The lower bottom plate 204 and the upper bottom plate 206 are arranged in the outer frame 202 at parallel intervals and enclose a cavity with the outer frame 202. A plurality of first partition boards 214 are arranged in the cavity, and the first partition boards 214 are arranged in parallel at intervals. And opposite sides of each first separator 214 are connected to the lower plate 204 and the upper plate 206, respectively, to divide the cavity into a plurality of liquid passages 212. One end of each first partition 214 is connected to the outer frame 202, and the other end is spaced from the outer frame 202 to form a first notch 214a. The first gaps 214a of the adjacent two first separators 214 are located at different ends of the adjacent two first separators 214, so that the plurality of liquid channels 212 are sequentially communicated and the flow path of the liquid flowing through the plurality of liquid channels 212 takes an S shape.

A heating structure 300 is disposed within each of the plurality of liquid channels 212. In the present embodiment, a plurality of heating structures 300 are provided in each liquid passage 212, and the plurality of heating structures 300 in each liquid passage 212 are arranged at intervals in parallel along the arrangement direction of the plurality of first separators 214.

In this embodiment, the heating structure 300 has a frame 310 and a heating element 320 disposed within the frame 310. The two open sides of frame 310 are connected to lower plate 204 and lower plate 204, respectively. And both ends of the frame 310 are spaced apart from the outer frame 202 to form two second notches 310a, and both sides of the frame 310 are spaced apart from the inner wall of the liquid channel 212.

In this embodiment, the frame 310 has a second spacer 312, a third spacer 314, and two end plates 316. The second separator 312 and the third separator 314 are arranged in parallel and spaced apart and parallel to the first separator 214. One end plate 316 connects one end of the second separator plate 312 and the third separator plate 314, and the other end plate 316 connects the other ends of the second separator plate 312 and the third separator plate 314. Wherein, the interval between two adjacent second separators 312 is the same as the interval between two adjacent second separators 312 and the first separator 214.

In this embodiment, the upper base plate 206 has an exposed carrying area 200a and a water-receiving and power-receiving area 200b. The carrying area 200a is provided with a thermally conductive layer. The carrying area 200a is used for mounting the battery module. The liquid inlet 210a and the liquid outlet 210b are located in the water receiving area 200b. The water-receiving and electric-receiving area 200b is provided with a wire 300a electrically connected with the heating element 320.

The utility model also provides a battery pack, which comprises the battery pack lower box 10 and a battery module 12. The battery module 12 is disposed on the lower case 200.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A lower box of battery package for install battery module, its characterized in that includes:

the lower box body is provided with a liquid flow passage, the liquid flow passage is provided with a liquid inlet and a liquid outlet, and the liquid flow passage is communicated with an external liquid loop through the liquid inlet and the liquid outlet; and

and the heating structure is arranged in the liquid flow passage.

2. The battery pack lower box body according to claim 1, wherein the lower box body is provided with an exposed bearing area and a water receiving and electricity receiving area, the bearing area is provided with a heat conducting layer, the bearing area is used for installing a battery module, the liquid inlet and the liquid outlet are positioned in the water receiving and electricity receiving area, and a wire electrically connected with the heating structure is arranged on a runner wall of the liquid runner, which is positioned in the water receiving and electricity receiving area in a penetrating manner.

3. The battery pack lower case according to claim 1, wherein the liquid flow passage includes a plurality of liquid passages, each of the liquid passages is communicated with the liquid inlet and the liquid outlet, and the heating structure is provided in the plurality of liquid passages.

4. A battery pack lower case according to claim 3, wherein a plurality of the liquid passages are arranged in parallel, and the plurality of the liquid passages are sequentially communicated and make the flow path of the liquid flowing through the plurality of the liquid passages take an S-shape.

5. The battery pack lower case according to claim 4, wherein adjacent two of the liquid passages are partitioned by a first partition plate, one end of each of the first partition plates has a first notch communicating with adjacent two of the liquid passages, the first notches of adjacent two of the first partition plates are located at different ends of adjacent two of the first partition plates so that a flow path of the liquid flowing through the plurality of the liquid passages takes an S shape;

the heating structure extends along the length direction of the liquid channel, and the two ends of the heating structure are respectively provided with a second notch, and the two sides of the heating structure are respectively spaced from the inner wall of the liquid channel.

6. The battery pack lower case according to claim 5, wherein a plurality of the heating structures are provided in each of the liquid passages, and the plurality of the heating structures in each of the liquid passages are arranged at intervals in parallel in the arrangement direction of the plurality of the liquid passages; and/or

The heating structure is provided with a frame and heating pieces arranged in the frame, two opening sides of the frame are respectively connected with the inner wall of the liquid channel, the frame is provided with a second partition plate, a third partition plate and two end plates, the second partition plate and the third partition plate are arranged at intervals in parallel and extend along the length direction of the liquid channel, one end plate is connected with one end of the second partition plate and one end of the third partition plate, the other end of the third partition plate is connected with the other end of the second partition plate, and the distance between every two adjacent second partition plates is identical with the distance between every two adjacent second partition plates and the first partition plate.

7. The battery pack lower case according to claim 1, wherein the lower case comprises an outer frame, a lower bottom plate and an upper bottom plate, wherein the lower bottom plate and the upper bottom plate are arranged in the outer frame at a parallel interval and are enclosed with the outer frame to form a cavity;

the cavity is internally provided with a plurality of first partition boards, the first partition boards are arranged in parallel at intervals, two opposite sides of each first partition board are respectively connected with the lower bottom board and the upper bottom board so as to divide the cavity into a plurality of liquid channels, one end of each first partition board is connected with the outer frame, the other end of each first partition board is spaced from the outer frame so as to form a first notch, and the first notches of two adjacent first partition boards are positioned at different ends of two adjacent first partition boards so that the liquid channels are sequentially communicated and the flow paths of liquid flowing through the liquid channels are S-shaped;

the heating structures are arranged in the liquid channels.

8. The battery pack lower case according to claim 7, wherein the heating structure has a frame and a heating member provided in the frame, both opening sides of the frame are connected to the lower plate and the lower plate, respectively, and both ends of the frame are spaced apart from the outer frame to form two second notches, and both sides of the frame are spaced apart from the inner wall of the liquid passage.

9. The battery pack lower box body according to claim 8, wherein the upper bottom plate is provided with an exposed bearing area and a water receiving and electricity receiving area, the bearing area is provided with a heat conducting layer, the bearing area is used for installing a battery module, the liquid inlet and the liquid outlet are positioned in the water receiving and electricity receiving area, and a wire electrically connected with the heating element is arranged on the water receiving and electricity receiving area in a penetrating manner; and/or

A plurality of heating structures are arranged in each liquid channel, and the heating structures in each liquid channel are arranged at intervals in parallel along the arrangement direction of the first partition plates; and/or

The frame is provided with a second baffle, a third baffle and two end plates, wherein the second baffle and the third baffle are arranged at intervals in parallel and are parallel to the first baffle, one end plate is connected with one end of the second baffle and one end of the third baffle, the other end of the third baffle is connected with the other end of the second baffle, and the distance between every two adjacent second baffles is the same as the distance between every two adjacent second baffles and the first baffle.

10. A battery pack, comprising:

the battery pack lower case according to any one of claims 1 to 9; and

and the battery module is arranged on the lower box body.