CN217182255U - Battery pack and electric automobile - Google Patents

Abstract

The utility model discloses a battery pack and an electric vehicle, which are used for connecting with a provided cooling liquid supply device, comprising: a mounting seat, which is arranged on the battery pack; and a connecting valve, which is fixed on the mounting seat, and the connecting valve is located on the mounting seat. One end of the inner side of the battery pack is connected to the liquid cooling pipeline, and the other end is used to connect to the liquid supply device. An openable and closable flow channel is formed inside the connecting valve, and the flow direction of the flow channel is parallel to the plane direction of the battery pack. , so as to realize the communication with the liquid cooling pipeline of the electric vehicle after the battery pack is installed in the electric vehicle in a horizontal direction. According to this solution, in the process of installing the battery pack to the bottom of the electric vehicle, when the battery pack is moved horizontally in place, the liquid cooling connection device of the battery pack and the liquid cooling pipeline of the electric vehicle can be sealed while the battery pack is installed. Connect, ensure tightness, prevent liquid leakage, and the installation and connection process is simple and efficient.

Description

Battery packs and electric vehicles

This application claims the priority of Chinese patent application 202010981928.8 with an application date of 2020/09/17. This application cites the above-mentioned patent application in its entirety.

technical field

The utility model relates to the field of electric vehicle power exchange, in particular to a horizontal butt-type battery terminal liquid cooling connection device, a battery pack and an electric vehicle.

Background technique

At present, there are two main ways to obtain energy for electric vehicles: charging and battery swapping. Because the power exchange method can realize the rapid supply of electric energy, reduce the waiting time of customers, and improve the utilization rate of the power exchange station. In addition, the battery can be charged centrally at night, which realizes the "peak shaving energy storage" of the power load. At the same time, the comprehensive utilization efficiency of the power equipment is improved, the service life of the battery is prolonged, and the utility model has high promotion value and economic significance.

In a battery-swappable electric vehicle, the replaceable battery pack is generally installed in a movable way, and the battery pack can be removed at any time and replaced with a new battery pack. The cooling pipe set on the quick-change battery pack is connected with the cooling system on the electric vehicle, and the circulation of the cooling liquid is used to realize the thermal balance of the quick-change battery pack. However, the current quick-change battery pack and the connector structure on the quick-change bracket assembly are not perfect in liquid tightness due to the limitation of the locking position of the locking mechanism of the battery pack, which may lead to the problem of dripping, which may lead to leakage of electricity and other safety hazards. Therefore, the design of the liquid cooling connector on the replaceable battery pack is greatly limited.

Utility model content

The technical problem to be solved by the utility model is to overcome the above problems, and to provide a horizontal butt-type battery terminal liquid cooling connection device, a battery pack and an electric vehicle.

The utility model solves the above-mentioned technical problems through the following technical solutions:

The utility model discloses a horizontal butt-type battery end liquid cooling connection device, which is used for connecting with a liquid supply device for cooling liquid provided, so as to pass the cooling liquid into a liquid cooling pipeline in a battery pack, comprising:

a mounting seat disposed on the battery pack; and

a connecting valve, fixed on the mounting seat, one end of the connecting valve located inside the battery pack is connected with the liquid cooling pipeline, and the other end is used for connecting with the liquid supply device, the connecting valve An openable and closable circulation channel is formed inside, and the circulation direction of the circulation channel is parallel to the plane direction of the battery pack, so as to realize the connection with the liquid cooling pipeline of the electric vehicle after the battery pack is installed in the electric vehicle in a horizontal direction. Connected.

According to this solution, in the process of installing the battery pack to the bottom of the electric vehicle, when the battery pack is moved horizontally in place, the liquid cooling connection device of the battery pack and the liquid cooling pipeline of the electric vehicle can be connected while the battery pack is being installed. Sealed connection ensures tightness, prevents liquid leakage, and the installation and connection process is simple and efficient.

Preferably, the mounting seat is provided on the top surface or the side surface of the battery pack, and the plane direction of the mounting seat is perpendicular to the plane direction of the battery pack and the flow direction.

According to this solution, the mounting seat is fixed relative to the battery pack in a vertical manner, and the flow direction of the flow channel of the connection valve is kept perpendicular to the mounting seat, that is, the flow direction of the flow channel of the connection valve is perpendicular to the battery pack. The horizontal direction of the battery pack is kept parallel, so that the liquid cooling connection device of the battery pack can be quickly sealed and communicated with the liquid cooling pipeline of the electric vehicle when the battery pack is lifted up to the position.

Preferably, the battery pack is detachably connected to the bottom of the electric vehicle through a locking device, and when the battery pack lifted from the bottom of the electric vehicle moves to the battery along the body length direction of the electric vehicle When the locking shaft on the bag is matched with the locking groove of the locking device, the liquid supply device of the electric vehicle communicates with the connecting valve and opens the circulation channel.

According to this solution, when the lock shafts on both sides of the battery pack are horizontally moved to match the lock grooves of the locking device, that is, the lock shafts of the battery pack are locked in the corresponding lock grooves, the liquid cooling pipeline of the electric vehicle is The connection valve with the battery pack gradually abuts from the contact state to the sealed connection and opens the flow channel.

Preferably, a positioning member is provided on the mounting seat, and the liquid supply device and the connecting valve are positioned by the positioning member.

According to the present solution, accurate and fast docking between the liquid supply device and the connecting valve is achieved through the positioning component.

Preferably, the positioning member includes two positioning holes or two positioning posts respectively provided on both sides of the connecting valve.

Preferably, the mounting seat is provided with a sealing ring arranged around the connecting valve.

According to this solution, the sealing ring is arranged around the connection valve to ensure further sealing connection between the liquid supply device and the liquid cooling connection device of the battery pack. Even if a slight liquid leakage occurs, it can ensure that the liquid will not leak out to other components. cause an impact.

Preferably, the connection valve includes a housing with the circulation channel formed therein and a valve core telescopically disposed in the circulation channel to open and close the circulation channel.

According to this solution, when the liquid supply device is sealedly connected to the connecting valve, the circulation channel can be quickly opened by moving the position of the valve core in the casing, and the opening of the circulation channel and the sealing connection are realized simultaneously, so as to avoid liquid leakage.

Preferably, the housing has a first end portion and a second end portion arranged along the flow direction, the first end portion is an open structure, and the second end portion is provided with a plurality of through holes, The flow channel is formed between the open structure and the plurality of through holes.

Preferably, the valve core comprises a core body extending from the first end to the second end, and a telescopic and movable sleeve is sleeved at one end of the core body corresponding to the first end and The valve plug used to seal the core body and the casing opens or closes the flow passage through the telescopic movement of the valve plug.

According to this solution, the position of the core body is kept unchanged in the casing of the connecting valve, and the valve plug sealed between the end face of the core body and the casing moves along the axial direction of the core body to open or close the space between the casing and the core body The circulation channel ensures that the opening and closing of the circulation channel and the sealing connection are both at the same time.

Preferably, the end surface of the core body is recessed at a predetermined depth position of the first end portion, and a guide structure is provided in the region of the casing higher than the end surface of the core body.

According to this solution, while the positioning components outside the connecting valve are positioned, the guiding structure at the front end of the core body can realize more precise butt joint between the joint of the liquid supply device and the connecting valve, and improve the sealing connection efficiency.

Preferably, one end of the valve core is fixedly connected to the second end and the other end is telescopically connected to the second end in the flow passage, the valve core is connected to the first end Seal the connection.

According to this solution, in the connecting valve housing, the valve core, which is sealed between one end and the housing, is set to be telescopically movable relative to the housing to realize the opening or closing of the circulation channel, so as to ensure the opening, closing and sealing of the circulation channel. Connectivity at the same time.

The utility model also discloses a battery pack, which comprises the horizontal butt-type battery end liquid cooling connection device described in any of the above solutions.

Preferably, the number of the horizontal butt-type battery end liquid-cooling connection devices is two, one of which is used as the input part of the cooling liquid, and the other is used as the output part of the cooling liquid.

Preferably, two of the horizontal butt-type battery end liquid cooling connection devices are respectively disposed at opposite ends of the battery pack.

According to this solution, the input part and the output part of the liquid cooling connection device are arranged at both ends of the battery pack, which can optimize the layout of the liquid cooling pipeline in the battery pack, reduce the space occupied by the liquid cooling pipeline, and improve the heat exchange efficiency.

The utility model also discloses a battery pack, including the battery pack described in any of the above solutions.

On the basis of conforming to common knowledge in the art, the above preferred conditions can be arbitrarily combined to obtain preferred examples of the present invention.

The positive improvement effect of the utility model is that: the utility model installs the battery end electrical connector and the vehicle end electrical connector between the battery pack and the battery accommodating cavity of the electric vehicle, so as to ensure that the two are not easily affected by the external environment when they are electrically connected. This ensures that the battery pack can stably provide power for the electric vehicle; in addition, with the attachment, the installation of the battery pack is more stable, and the liquid cooling connection device is used to better control the temperature of the battery pack.

Description of drawings

1 is a schematic structural diagram of a liquid cooling connection assembly according to Embodiment 1 of the present invention;

2 is a schematic structural diagram of a first liquid cooling connection device according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of the second liquid cooling connection device in Embodiment 1 of the present invention;

4 is a schematic diagram of an installation method of the horizontal butt-type battery end liquid cooling connection device installed on the battery pack according to Embodiment 2 of the present invention;

FIG. 5 is a schematic structural diagram of a liquid cooling connection assembly communicating with a battery pack according to Embodiment 2 of the present invention.

Detailed ways

The present invention will be more clearly and completely described below by means of the embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the described embodiments.

Example 1

As shown in Figs. 1 to 3, the present embodiment 1 discloses a liquid cooling connection assembly 5000, the liquid cooling connection assembly 5000 is used between the liquid supply device and the liquid cooling pipeline, through the liquid cooling connection assembly 5000 Realize the communication between the liquid supply device and the liquid cooling pipeline, let the cooling liquid in the liquid supply device flow into the liquid cooling pipeline and return to the liquid supply device, so as to realize the heat in the area where the liquid cooling pipeline is set exchange.

Specifically, the liquid cooling connection assembly 5000 includes a first liquid cooling connection device 5100 and a second liquid cooling connection device 5200. The first liquid cooling connection device 5100 is used in cooperation with the second liquid cooling connection device 5200, and one of them is provided as a supply The connection joint of the liquid device, and the other one as the connection joint of the liquid cooling pipeline, through the liquid cooling connection assembly 5000 to realize the sealing connection and the conduction of the liquid cooling pipeline, so as to allow the cooling liquid to flow.

As shown in FIGS. 1 and 2 , the first liquid cooling connection device 5100 includes a first mounting seat 5110 and a first connection valve 5120 .

As shown in FIGS. 1 and 3 , the second liquid cooling connection device 5200 includes a second mounting seat 5210 and a second connection valve 5220 .

The first mounting seat 5110 is a flat plate-like structure, specifically, rectangular, and is used for mounting and fixing the first connecting valve 5120 .

The first connecting valve 5120 is fixed on the first mounting seat 5110 , an openable and closable circulation channel is formed inside the first connecting valve 5120 , and the circulation direction of the circulation channel is perpendicular to the plane direction of the first mounting seat 5110 .

The second mounting seat 5210 is a flat plate-like structure, and is specifically rectangular, and is used for mounting and fixing the second connecting valve 5220 .

The second connecting valve 5220 is fixed on the second mounting seat 5210 , an openable and closable circulation channel is formed inside the second connecting valve 5220 , and the circulation direction of the circulation channel is perpendicular to the plane direction of the second mounting seat 5210 .

In actual use, one end of the first connection valve 5120 is connected to the liquid cooling pipeline, and one end of the second connection valve 5220 is connected to the liquid supply device. The circulation channels in the first connection valve 5120 and the second connection valve 5220 are opened simultaneously to realize the circulation of the cooling liquid in the liquid supply device into the liquid cooling pipeline.

As shown in FIG. 2 , the first connection valve 5120 includes a first housing 5121 with a flow channel formed therein, and a first valve core 5122 telescopically disposed in the flow channel to open and close the flow channel.

The first housing 5121 is an air structure with a first end and a second end arranged along the flow direction. The first end is an open structure and the second end is provided with a plurality of through holes. A flow channel is formed between the plurality of through holes.

The first valve core 5122 includes a first core body 5122a extending from the first end portion to the second end portion of the first housing 5121, and a telescopic and movable sleeve on the first core body 5122a corresponding to the first end portion. One end of the valve plug 5122b used to seal the first core body 5122a and the first housing 5121 opens or closes the flow passage through the telescopic movement of the valve plug 5122b.

As shown in FIG. 3 , the second connection valve 5220 includes a second housing 5221 with a flow channel formed therein, and a second valve core 5222 telescopically disposed in the flow channel to open and close the flow channel.

The second casing 5221 is an air structure, and the outer diameter of the second casing 5221 matches the inner diameter of the first casing 5121. The second casing 5221 also has a first end portion and a second end portion arranged along the flow direction. The first end is an open structure and the second end is provided with a plurality of through holes, and a circulation channel is formed between the open structure and the plurality of through holes.

One end of the second valve core 5222 is fixedly connected to the first end of the second housing 5221 and the other end is telescopically connected to the second end of the second housing 5221 in the flow passage. The second valve core 5222 is connected to the first The ends are sealed and connected, and the corresponding flow channel is opened or closed through the telescopic movement of the second valve core 5222 .

As shown in FIG. 2 , the first mounting seat 5110 is provided with a first positioning member 5130 , and as shown in FIG. 3 , the second mounting seat 5210 is provided with a second positioning member 5230 . When the second liquid cooling connection device 5200 is connected, the first positioning member 5130 and the second positioning member 5230 are used for positioning, so as to ensure the accuracy of the connection and improve the connection efficiency. Specifically, the specific structural form of the first positioning member 5130 may be two positioning holes respectively disposed on both sides of the first connecting valve 5120, and the specific structural form of the second positioning member 5230 may be two positioning holes respectively disposed on the second connecting valve 5220. Two positioning columns on the side; the first positioning member 5130 and the second positioning member 5230 can also be set in opposite directions, or other positioning structures can be used to meet the positioning requirements.

As also shown in FIG. 2 , the end face of the first core 5122a is recessed at a predetermined depth of the first end face of the first end portion, and a guide structure is provided in the region of the first shell 5121 higher than the end face of the first core 5122a. The guide structure can be a guide slope, and of course, can also be any other structure with guiding function. In this way, when the first positioning member 5130 and the second positioning member 5230 achieve positioning, the guide through the front end of the first core 5122a The structure can realize more precise butt joint between the second connection valve 5220 and the first connection valve 5120, and improve the sealing connection efficiency.

When the first connection valve 5120 is connected with the second connection valve 5220, the edge of the second housing 5221 pushes against the valve plug 5122b of the first valve core 5122, so that the valve plug 5122b retracts inward relative to the first core body 5122a, and at the same time The first core 5122a pushes against the second valve core 5222 to retract the second valve core 5222 toward the inside of the second housing 5221, so that the circulation channels of the first housing 5121 and the second housing 5221 are opened at the same time, and due to the first The second casing 5221 is inserted into the first casing 5121 to achieve a sealed connection between the first casing 5121 and the second casing 5221 .

As shown in FIG. 3 , the second mounting seat 521 is further provided with a sealing ring 5240 arranged around the second connecting valve 5220. After the first connecting valve 5120 is connected with the second connecting valve 5220, the sealing ring 5240 is squeezed to make the The first mounting seat 5110 and the second mounting seat 5210 are kept in a sealed connection to ensure the tightness of the first connection valve 5120 and the second connection valve 5220. In this way, even a slight leakage phenomenon can be guaranteed. The liquid will not leak and pose a threat or influence to other components in the operating environment.

According to the liquid cooling connection assembly 5000 of the present embodiment 1, through the matching connection of the first liquid cooling connection device 5100 and the second liquid cooling connection device 5200, the openable and closed connectivity and sealing performance of the circulation channel are ensured, and the occurrence of cooling liquid is avoided. Dangers of dripping etc. The liquid cooling connection assembly 5000 can be applied in all environments where liquid cooling pipelines are communicated, such as the pipeline communication between the battery pack of an electric vehicle and the liquid supply device on the vehicle, and so on.

In another embodiment, the sealing ring can also be arranged on the first mounting seat, which can also achieve sealing connection, and can be arbitrarily arranged according to actual needs.

Example 2

As shown in FIG. 4 and FIG. 5 , this embodiment 2 discloses another battery pack 6000, which is used in an electric vehicle to provide power for the electric vehicle. And the battery pack 6000 has the first liquid cooling connection device 5100 or the second liquid cooling connection device 5200 of the structure in the above-mentioned embodiment 5, and the first liquid cooling connection device 5100 or the second liquid cooling connection device 5200 is used as a horizontal docking battery. The terminal liquid cooling connection device is arranged on the battery pack 6000 . In the horizontal butt-type battery end liquid cooling connection device, the first mounting seat 5110 and the second mounting seat 5210 and the first connecting valve 5120 and the second connecting valve 5220 are collectively referred to as the mounting seat and the connecting valve.

When the battery pack 6000 is installed on the electric vehicle, the horizontal butt-type battery end liquid cooling connection device is connected to the liquid supply device that provides the cooling liquid on the electric vehicle, so that the cooling liquid is passed into the liquid cooling pipeline in the battery pack 6000 , in order to facilitate heat exchange with the battery module during the charging and discharging process in the battery pack 6000 , and provide a suitable working temperature environment for the battery pack 6000 . Here, the liquid supply device on the electric vehicle is connected to the second liquid cooling connection device 5200 or the first liquid cooling connection device 5100 that matches the horizontal butt-type battery end liquid cooling connection device on the battery pack 6000 through the liquid cooling pipeline. That is to say, the first liquid cooling connection device 5100 or the second liquid cooling connection device 5200 is respectively connected between the battery pack 6000 and the electric vehicle, and the two may be arranged interchangeably.

Specifically, the mounting seat is arranged on the top surface or side surface of the battery pack 6000, the connecting valve is fixed on the mounting seat, the plane direction of the mounting seat is perpendicular to the plane direction of the battery pack 6000, and the plane direction of the mounting seat is the same as the flow direction. The direction is vertical, that is, the flow direction of the flow channel is parallel to the plane direction of the battery pack 6000, so that the battery pack 6000 is connected to the electric vehicle liquid cooling pipeline after the battery pack 6000 is installed in the electric vehicle in a horizontal direction. One end of the connection valve located inside the battery pack 6000 is connected to the liquid cooling pipeline in the battery pack 6000, and the other end is used to connect with the liquid supply device. The liquid supply device here refers to the liquid supply device that provides the cooling liquid in the electric vehicle or the liquid supply device set on the battery charging rack.

Here, the battery pack 6000 is detachably connected to the bottom of the electric vehicle through a locking device, and the locking device includes a locking mechanism with an L-shaped locking groove and a plurality of locking shafts disposed on both sides of the battery pack 6000 . The battery pack 6000 is lifted into place by the bottom of the electric vehicle and further moves along the length of the electric vehicle, that is, vertically and horizontally along the direction of the L-shaped lock slot, until the lock shaft on the battery pack 6000 and the lock slot of the locking mechanism When matched, the battery pack 6000 is successfully locked. When the battery pack 6000 is vertically lifted into place, the horizontal butt-type battery end liquid cooling connection device is aligned with the liquid supply device of the electric vehicle. With the horizontal movement of the battery pack 6000, the liquid cooling pipeline of the liquid supply device of the electric vehicle The connecting device is communicated with the connecting valve on the battery pack 6000 and opens the flow channel of the connecting valve.

According to the battery pack 6000 of the second embodiment, in the process of installing the battery pack 6000 to the bottom of the electric vehicle, after the battery pack 6000 is vertically lifted into place, with the continuous horizontal movement of the battery pack 6000, the liquid supply device of the electric vehicle The connection valve between the liquid cooling connection device on the battery pack 6000 and the battery pack 6000 gradually abuts from the initial contact state to the sealed connection and opens the flow channel. While the battery pack 6000 is installed, the liquid cooling pipeline can be sealed and communicated. The installation and connection process Simple and efficient.

According to the solution of the second embodiment, the mounting seat is fixed relative to the battery pack 6000 in a vertical manner, and the flow direction of the flow channel of the connection valve is kept perpendicular to the mounting seat, that is, the flow direction of the flow channel of the connection valve is set vertically. The flow direction is kept parallel to the horizontal direction of the battery pack 6000 , so that the liquid cooling connection device of the battery pack 6000 can be quickly sealed and communicated with the liquid cooling pipeline of the electric vehicle while the battery pack 6000 is lifted up into place.

In another embodiment, the battery pack 6000 has all the features of the above-mentioned embodiments, and further has: the number of horizontal butt-type battery-end liquid cooling connection devices is two, one of which is used as the input part of the cooling liquid, and the other is used as the cooling liquid liquid output. By arranging the input part and the output part of the liquid cooling connection device separately, the arrangement of the liquid cooling pipeline inside the battery pack 6000 is more flexible. Preferably, two horizontal butt-type battery end liquid cooling connection devices are respectively disposed at opposite ends of the battery pack 6000 . Setting the input and output of the liquid cooling connection device at both ends of the battery pack 6000 can optimize the layout of the liquid cooling pipelines in the battery pack 6000, reduce the space occupied by the liquid cooling pipelines, and improve the heat exchange efficiency.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (14)

1. A battery pack, characterized in that it comprises a horizontal butt-type battery end liquid-cooling connection device, which is used to connect with a provided cooling liquid supply device, thereby connecting the The cooling liquid is passed into the liquid cooling pipeline in the battery pack, and the horizontal butt-type battery end liquid cooling connection device includes: a mounting seat disposed on the battery pack; and a connecting valve, fixed on the mounting seat, one end of the connecting valve located inside the battery pack is connected with the liquid cooling pipeline, and the other end is used for connecting with the liquid supply device, the connecting valve An openable and closable circulation channel is formed inside, and the circulation direction of the circulation channel is parallel to the plane direction of the battery pack, so as to realize the connection with the liquid cooling pipeline of the electric vehicle after the battery pack is installed in the electric vehicle in a horizontal direction. Connected. 2. The battery pack of claim 1, wherein The mounting seat is arranged on the top surface or the side surface of the battery pack, and the plane direction of the mounting seat is perpendicular to the plane direction of the battery pack and the flow direction. 3. The battery pack of claim 1, wherein The battery pack is detachably connected to the bottom of the electric vehicle through a locking device, and when the battery pack lifted by the bottom of the electric vehicle moves to the bottom of the battery pack along the body length direction of the electric vehicle. When the locking shaft is matched with the locking groove of the locking device, the liquid supply device of the electric vehicle communicates with the connecting valve and opens the circulation channel. 4. The battery pack of claim 1, wherein A positioning member is provided on the mounting seat, and the liquid supply device and the connecting valve are positioned by the positioning member. 5. The battery pack of claim 4, wherein The positioning component includes two positioning holes or two positioning columns respectively arranged on both sides of the connecting valve. 6. The battery pack of claim 1, wherein The mounting seat is provided with a sealing ring arranged around the connecting valve. 7. The battery pack of claim 1, wherein The connecting valve includes a casing with the circulation channel formed therein and a valve core telescopically disposed in the circulation channel to open and close the circulation channel. 8. The battery pack of claim 7, wherein The housing has a first end portion and a second end portion arranged along the flow direction, the first end portion is an open structure and a plurality of through holes are provided on the second end portion, and the open end portion is provided with a plurality of through holes. The flow channel is formed between the port structure and the plurality of through holes. 9. The battery pack of claim 8, wherein The valve core includes a core body extending from the first end portion to the second end portion, and a telescopic and movable sleeve is sleeved at one end of the core body corresponding to the first end portion and used for sealing The core body and the valve plug of the casing open or close the flow passage through the telescopic movement of the valve plug. 10. The battery pack of claim 9, wherein The end surface of the core body is recessed at a predetermined depth position of the first end portion, and a guide structure is provided in the region of the casing higher than the end surface of the core body. 11. The battery pack of claim 8, wherein One end of the valve core is fixedly connected to the second end portion, and the other end is telescopically connected to the second end portion in the flow passage, and the valve core is sealedly connected to the first end portion. 12 . The battery pack according to claim 1 , wherein the number of the horizontal butt-type battery end liquid cooling connection devices is two, one of which is used as the input part of the cooling liquid, and the other is used as the output part of the cooling liquid. 13 . . 13 . The battery pack according to claim 12 , wherein the two horizontal butt-type battery end liquid cooling connection devices are respectively disposed at opposite ends of the battery pack. 14 . 14. An electric vehicle, characterized by comprising the battery pack according to claim 12 or 13.

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