CN219419215U - Liquid cooling battery box and power battery pack - Google Patents

Abstract

The utility model relates to the technical field of power battery manufacturing, in particular to a liquid cooling battery box and a power battery pack. Through running through the case setting with the joint component of liquid cooling board, realize the integration that liquid cooling system coolant liquid import and export and battery package shell coolant liquid import and export, reduce the joint pipeline of traditional structure, reduce the use of liquid cooling battery box structure spare, reduce cost avoids the coolant liquid leakage risk that the pipeline connection brought, is favorable to improving whole package security, simultaneously, has reduced joint pipeline occupation space, reduces the influence to battery package volume under the circumstances that realizes battery box liquid cooling function, reduces the influence to battery energy density. The power battery pack has the advantages of strong heat dissipation capacity, high safety and high energy density.

Description

Liquid cooling battery box and power battery pack

Technical Field

The utility model relates to the technical field of power battery manufacturing, in particular to a liquid cooling battery box and a power battery pack.

Background

The energy density of the battery is the electric energy released by the average unit volume or the mass of the battery, along with the continuous improvement of the energy density requirement of the power battery, the whole power battery is developed towards flattening and integration, and a high-nickel positive electrode and a silicon-carbon negative electrode become main technical routes, but at the same time, the temperature sensitivity window of the power battery is also more obvious, so that the performance, the safety and the cycle life of the power battery are seriously influenced, the safety of a battery pack is more and more concerned, the cooling mode of the traditional power battery mainly comprises liquid cooling and air cooling under natural convection, the natural convection air cooling is greatly influenced by the environmental temperature, the heat dissipation effect is poorer than that of the liquid cooling mode, and the normal operation of a cooling system is an important measure for efficiently guaranteeing the safety of the battery pack, so the liquid cooling of the power battery pack is a necessary trend of development.

However, the liquid cooling system of the current power battery and the battery pack shell are provided with independent cooling liquid inlets and outlets, the cooling liquid inlets and outlets of the liquid cooling system are connected to the cooling liquid inlets and outlets of the battery pack shell through joint pipelines, and the connecting pipelines occupy the internal space of the battery pack, so that the energy density of the battery is reduced, and the cooling liquid leakage phenomenon is easy to occur at the joint position, so that the cooling liquid is lost, and the safety of the power battery is affected.

Therefore, a technical scheme is needed at present to solve the technical problems that the existing power battery liquid cooling system is connected to the cooling liquid inlet and outlet of the battery pack shell through a joint pipeline, occupies the internal space of the battery pack, reduces the energy density of the battery, is easy to cause the leakage phenomenon of the cooling liquid, and affects the safety of the power battery.

Disclosure of Invention

The utility model aims at: the liquid cooling system comprises a liquid cooling battery box, a liquid cooling battery box and a liquid cooling battery.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the liquid cooling battery box comprises a box shell, wherein a liquid cooling plate is arranged in the box shell, a liquid cooling flow channel is arranged in the liquid cooling plate, the liquid cooling plate is provided with a joint member, the joint member is communicated with the liquid cooling flow channel, and the joint member is configured to penetrate through the box shell.

According to the liquid cooling battery box disclosed by the utility model, the joint component of the liquid cooling plate penetrates through the box shell, so that the cooling liquid inlet and outlet of the liquid cooling plate penetrate through the cooling liquid inlet and outlet of the battery pack shell, the integration of the cooling liquid inlet and outlet of the liquid cooling system and the cooling liquid inlet and outlet of the battery pack shell is realized, the joint pipeline of the traditional structure is reduced, the use of the structural component of the liquid cooling battery box is reduced, the cost is reduced, the cooling liquid leakage risk caused by pipeline connection is avoided, the whole package safety is favorably improved, meanwhile, the occupied space of the joint pipeline is reduced, the influence on the whole package volume is reduced under the condition of realizing the liquid cooling function of the battery box, the influence on the energy density of a battery is reduced, meanwhile, the joint component directly penetrates through the box shell, the connection distance between the liquid cooling plate and an external cooling liquid supply mechanism is shortened, the full utilization of cooling liquid is favorably reduced, and the energy consumption required by cooling liquid transportation is favorably reduced, and the energy-saving effect is achieved.

As a preferable mode of the utility model, the outer wall of the joint member is provided with an extension plate, and the extension plate is in sealing connection with the inner wall of the case so as to increase the contact surface between the joint member and the case. So as to improve the tightness of the contact surface of the joint component and the case shell and further improve the overall tightness of the case shell.

As a preferred embodiment of the present utility model, a sealing member is provided between the extension plate and the inner wall of the case. To further improve the overall tightness of the tank shell.

As a preferable scheme of the utility model, the liquid cooling plate comprises a runner plate and a cover plate, wherein the runner plate is provided with a stamping runner, the runner plate and the cover plate are buckled and connected to form the liquid cooling runner, and the joint component is vertically connected to the cover plate so as to reduce the occupation of the joint component to the inner space of the box shell. The liquid cooling runner shaping is easy, reduces manufacturing cost, simultaneously, and the apron is because not setting up the punching press runner, and is more level and smooth than the runner board, connects the component and comparatively level apron connection, makes things convenient for the stable setting of joint component, and connects the component perpendicular with the liquid cooling board, does not occupy the inside horizontal space of the case that the liquid cooling board face is located, is favorable to realizing the maximize of liquid cooling board, makes liquid cooling board cover face and case inner chamber adaptation, is favorable to increasing the liquid cooling area, improves heat dissipation intensity.

As a preferable mode of the present utility model, the inner wall of the joint member and the punched flow passage are smoothly transited. The smooth entry and/or output of the cooling liquid is realized, and the cooling effect is enhanced.

As a preferred embodiment of the present utility model, the case includes a tray and a case cover, and the liquid cooling plate and the tray define a battery mounting chamber. The liquid cooling plate is close to the box cover, is located at the top of the battery in use, reduces the occupied volume of the liquid cooling plate to the inner space of the box shell, and performs liquid cooling heat dissipation on a heat rising path, so that heat dissipation capacity is improved.

As a preferred embodiment of the present utility model, the flow path plate is disposed at a side close to the cover. The flat cover plate is close to or attached to the battery side, so that the heat dissipation area is increased, and the heat dissipation capacity is further improved.

As a preferred embodiment of the present utility model, the tray is provided with a sleeve adapted to the joint member. The liquid cooling plate is fixed relative to the box shell through the cooperation of the joint component and the sleeve, so that the stability of the liquid cooling plate is improved, the stable use of the liquid cooling battery box is ensured, and the safety of the battery pack is improved.

As a preferable scheme of the utility model, the tray and the box cover are respectively provided with a frame extending towards the outside of the box shell, and the tray is detachably connected with the box cover through the frame. The connecting part of the tray and the box cover does not occupy the inner space of the box shell, and a regular inner cavity is formed in the box shell so as to be beneficial to the arrangement of the liquid cooling plate and the battery module in the battery box and improve the utilization rate of the inner space of the box shell.

As a preferable mode of the utility model, the tray is sunk or projected to form a first connecting part at the frame, the box cover is provided with a second connecting part at the frame, the first connecting part and the second connecting part are combined to form a joint mounting cavity, the liquid cooling plate is provided with an extending part, the extending part is arranged in the joint mounting cavity, and the joint member is connected with the extending part. The special-shaped structures of the tray and the box cover, which are inward or outward, provide mounting positions for the joint members, so that the covering surface of the liquid cooling plate is further enlarged, the occupation of the inner space of the box shell by the arrangement of the joint members is reduced, the heat radiation strength is improved, the joint members and the battery can be arranged in a partitioning manner, and the influence of leakage of cooling liquid on the battery is avoided.

As a preferred embodiment of the present utility model, the joint member comprises a liquid inlet joint and/or a liquid outlet joint. The liquid inlet connector and the liquid outlet connector can be arranged in one connector installation cavity according to actual conditions, and can be also arranged in an independent connector installation cavity separately so as to form liquid cooling battery boxes with different structural styles.

As a preferable mode of the utility model, the extension part is provided with a liquid inlet channel converging part and/or a liquid outlet channel converging part, the liquid inlet channel converging part is used for being connected with the liquid inlet joint, and the liquid outlet channel converging part is used for being connected with the liquid outlet joint.

The power battery pack is provided with the liquid cooling battery box, and a plurality of battery modules are arranged in the liquid cooling battery box.

According to the power battery pack, the liquid cooling battery box with the integrated structure of the cooling liquid inlet and outlet of the liquid cooling system and the cooling liquid inlet and outlet of the battery pack shell is adopted, so that the influence of the arrangement of the liquid cooling structure on the whole volume of the power battery pack is reduced, the heat dissipation capacity of the liquid cooling plate is high, and the whole safety and the energy density of the power battery pack are improved.

In summary, due to the adoption of the technical scheme, the liquid cooling battery box has the beneficial effects that:

1. the integration of a cooling liquid inlet and a cooling liquid outlet of the liquid cooling system and a cooling liquid inlet and outlet of a battery pack shell is realized, and joint pipelines of a traditional structure are reduced;

2. the use of structural components of the liquid cooling battery box is reduced, and the cost is reduced;

3. the risk of leakage of the cooling liquid caused by pipeline connection is avoided, and the whole package safety is improved;

4. the occupied space of the joint pipeline is reduced, the influence on the whole package volume can be reduced under the condition of realizing the liquid cooling function of the battery box, and the influence on the battery energy density is reduced;

5. the joint component directly penetrates through the box shell, so that the connection distance between the liquid cooling plate and an external cooling liquid supply mechanism is shortened, the full utilization of cooling liquid is realized, the energy consumption required by cooling liquid conveying is reduced, and the energy-saving effect is achieved;

the power battery pack has the beneficial effects that:

through adopting above-mentioned liquid cooling system coolant liquid import and export and battery package shell coolant liquid import and export the liquid cooling battery box of integrated structure, reduce the influence that the liquid cooling structure set up to the whole volume of power battery package, the liquid cooling board heat dispersion is strong, is favorable to improving the whole security and the energy density of power battery package.

Drawings

FIG. 1 is a schematic diagram of a liquid-cooled battery box of the present utility model;

FIG. 2 is a front view of a liquid cooled battery box of the present utility model;

FIG. 3 is a right side view of the liquid cooled battery box of the present utility model;

FIG. 4 is a bottom view of the liquid cooled battery box of the present utility model;

FIG. 5 is a schematic view of the structure of section A-A of FIG. 4;

FIG. 6 is a schematic diagram of a second structure of section A-A in FIG. 4;

FIG. 7 is a schematic diagram of a combination structure of the liquid cooling plate and the tray according to the present utility model;

FIG. 8 is a front view of FIG. 6;

FIG. 9 is a schematic view of a liquid cooling plate according to the present utility model

FIG. 10 is a schematic diagram II of a combination structure of the liquid cooling plate and the tray according to the present utility model;

FIG. 11 is a schematic view of the structure of FIG. 10 at B in partial enlargement;

FIG. 12 is an isometric view of a power cell pack of the present utility model;

fig. 13 is a schematic cross-sectional structure of the power battery pack of the present utility model.

Icon:

1-case, 11-tray, 111-first connecting part, 12-case lid, 121-second connecting part, 13-sleeve, 14-frame, 2-liquid cooling plate, 21-liquid cooling runner, 211-inlet runner converging part, 212-outlet runner converging part, 22-runner plate, 23-cover plate, 24-extending part, 3-joint member, 31-extending plate, 32-inlet joint, 33-outlet joint, 4-sealing member, 5-battery mounting cavity, 6-joint mounting cavity, 7-battery module.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Example 1

As shown in fig. 1 to 11, the liquid-cooled battery box of the present embodiment includes a box housing 1, a liquid-cooled plate 2 is provided in the box housing 1, a liquid-cooled flow passage 21 is provided in the liquid-cooled plate 2, the liquid-cooled plate 2 is provided with a joint member 3, the joint member 3 communicates with the liquid-cooled flow passage 21, and the joint member 3 is configured to pass through the box housing 1.

Wherein, the case 1 is used for providing the holding chamber of battery installation, and liquid cooling board 2 is constructed to platy structure spare, tiling setting in case 1, forms the battery box of taking the liquid cooling function.

Specifically, compared with the battery box of the air cooling heat dissipation mode under natural convection, the liquid cooling heat dissipation effect is better, meanwhile, the thickness of the liquid cooling plate 2 is thinner, the influence on the inner space of the box shell 1 is smaller, compared with the battery box of the air cooling heat dissipation mode under natural convection, the whole volume of the battery box is equivalent, the heat dissipation effect under the same volume is obviously improved, and the safety of the power battery is improved.

Preferably, referring to fig. 5 to 6, the joint member 3 includes a liquid inlet joint 32 for inputting the cooling liquid into the liquid cooling plate 2 and a liquid outlet joint 33 for outputting the cooling liquid from the liquid cooling plate 2.

In this embodiment, the liquid inlet connector 32 and the liquid outlet connector 33 are configured as pipe connectors of a sleeve structure, and extend through the casing 1 by the length of the pipe connectors, and are connected with an external cooling liquid supply mechanism at the end part extending out of the casing 1, so that the circulation flow of cooling liquid inside and outside the casing 1 is realized by the external cooling liquid supply mechanism with power.

Preferably, in this embodiment, referring to fig. 5-6, the liquid inlet connector 32 and the liquid outlet connector 33 are straight connectors, the connector member 3 penetrates through the top or bottom of the case 1 in the axial direction of the connector member 3, and compared with the existing liquid cooling battery case with a liquid cooling system, the connector member 3 does not occupy the internal space of the case 1, the surface area of the liquid cooling plate 2 can be enlarged to match with the internal cavity of the case 1, and the liquid cooling heat dissipation area in the case 1 is increased under the condition that the whole volume of the battery case is not changed, so that the heat dissipation capability of the battery case is further improved.

In addition, because the liquid inlet connector 32 and the liquid outlet connector 33 do not occupy the internal space of the case 1, the liquid inlet connector 32 and the liquid outlet connector 33 can penetrate through any position of the case 1 according to actual conditions, and only the fact that the connector member 3 passes through the case 1 is met, and then the connector member 3 can be vertically communicated with the liquid cooling plate 2 in the case 1, and the optional installation position of the connector member 3 is wider, so that the adaptation of the liquid cooling battery case of the structure to different application environments is facilitated, the universality is improved, the preparation cost is reduced, and meanwhile, the liquid cooling plate 2 in the case 1 is connected with an external cooling liquid supply mechanism through the connector member 3 with the shortest distance, so that the cooling liquid conveying distance between the external cooling liquid supply mechanism and the liquid cooling plate 2 in the case 1 is shorter, the smooth conveying of cooling liquid can be realized through smaller energy, the energy consumption for conveying the cooling liquid is reduced, and the energy-saving effect is achieved.

The liquid cooling battery box of this embodiment runs through case 1 setting through the joint component 3 with liquid cooling board 2, realize the integration setting that liquid cooling system coolant liquid import and export and battery package shell coolant liquid import and export, reduce traditional liquid cooling system's joint pipeline, reduce the use of liquid cooling battery box structure spare, reduce cost, can avoid the coolant liquid leakage risk that joint pipeline connection brought simultaneously, be favorable to improving whole package security, simultaneously, reduced joint pipeline occupation space, can reduce the influence to whole package volume under the circumstances that realizes battery box liquid cooling function, reduce the influence that liquid cooling system set up to battery package energy density, the liquid cooling of applicable battery such as conventional battery module, blade battery holds.

Example 2

As shown in fig. 1 to 11, in the liquid-cooled battery box of this embodiment, on the basis of embodiment 1, an extension plate 31 is disposed on the outer wall of the joint member 3, and the extension plate 31 is connected with the inner wall of the box casing 1 in a sealing manner, so as to increase the contact surface between the joint member 3 and the box casing 1.

Preferably, in this embodiment, the joint member 3 includes an independently disposed liquid inlet joint 32 and an independently disposed liquid outlet joint 33, the extension plate 31 is configured as a disc-shaped flat plate structural member disposed on an outer wall of the joint member 3, and the extension plate 31 and the joint member 3 are integrally machined and formed or are mounted by conventional connection modes such as threads, sleeving and bonding.

Preferably, a sealing member 4 is disposed between the extension plate 31 and the inner wall of the casing 1, so as to improve the overall sealing performance of the casing, and the sealing member 4 includes a rubber sheet, compressed foam, or other structural member that provides a sealing effect through its own flexibility.

Example 3

As shown in fig. 1 to 11, in the liquid-cooled battery box of this embodiment, on the basis of embodiment 1 and embodiment 2, the liquid-cooled plate 2 includes a runner plate 22 and a cover plate 23, the runner plate 22 is provided with a punching runner, the runner plate 22 and the cover plate 23 are fastened and connected to form the liquid-cooled runner 21, and the joint member 3 is vertically connected to the cover plate 23.

Specifically, the runner plate 22 is configured as a single-layer plate structural member including a stamping runner, the cover plate 23 is configured as a plane plate structural member, the cover plate 23 is welded with the runner plate 22 in a buckling manner, the liquid cooling runner 21 is formed, the liquid cooling plate 2 can be made of metal materials with high heat conductivity, including but not limited to aluminum, copper and alloys thereof, and heat exchange and heat dissipation can be realized through cooling liquid flowing inside and the metal outer wall.

Preferably, the case 1 with the liquid cooling board 2 all can adopt the high metal material structure of thermal conductivity to the radiating effect of furthest improves liquid cooling battery box, after setting up the battery module to liquid cooling battery box, liquid cooling board 2 can laminate the battery module setting according to actual conditions, is favorable to increasing the effective radiating area between battery module and the liquid cooling board 2.

The liquid cooling battery box of this embodiment, liquid cooling runner 21 shaping is easy, reduce manufacturing cost, joint component 3 is connected with comparatively smooth apron 23 is perpendicular, make things convenient for joint component 3's stable setting, make joint component 3 run through case 1 setting under the condition of shortest length joint component 3, and joint component 3 can be according to actual conditions, set up the optional position at the liquid cooling board 2 face, be favorable to improving the commonality of liquid cooling battery box, simultaneously, under limited case 1 inner chamber, joint component 3 does not occupy the space of any lateral direction of case 1, can realize the coverage area maximize of liquid cooling board 2, increase the liquid cooling area, improve heat dispersion.

In addition, compared with the joint pipeline structure in the prior art, the length of the joint component 3 of the embodiment is shorter, the distance between the liquid cooling plate 2 and an external cooling liquid supply mechanism is effectively shortened, the heat exchange loss of cooling liquid is reduced, the cooling liquid is effectively utilized, the utilization efficiency of the cooling liquid is improved, the power loss of conveying the cooling liquid is reduced under the condition of equal cooling effect, and the energy-saving effect is achieved.

Preferably, the inner wall of the joint member 3 is in smooth transition with the punching flow passage.

Specifically, the punching runner is configured to have a smooth edge during preparation, and after the joint member 3 is connected with the liquid cooling plate 2, the joint member 3 and the punching runner edge are in smooth transition, so that the flow of the cooling liquid is not hindered, the cooling liquid can smoothly enter and exit, the flow velocity before and after passing through the joint member 3 is kept consistent, the temperature loss is reduced, and the cooling effect is enhanced.

Example 4

As shown in fig. 1 to 11, in the liquid-cooled battery box of the present embodiment, on the basis of embodiment 1 to embodiment 3, the box casing 1 includes a tray 11 and a box cover 12, the liquid-cooled plate 2 and the tray 11 define a battery mounting chamber 5, and the flow path plate 22 is disposed on a side close to the box cover 12.

Specifically, referring to fig. 8, the runner plate 22 forming the liquid cooling plate 2 has a plurality of rib structures due to the stamping runner formed on the runner plate 22, and when in use, the liquid cooling plate 2 with the rib structures is attached to/near the case cover 12, a heat exchange space is formed between the liquid cooling plate 2 and the case cover 12, and liquid cooling of the liquid cooling plate 2 and heat exchange of the liquid cooling plate 2 and the case cover 12 are simultaneously realized on a heat rising path, so that the overall heat dissipation capacity of the liquid cooling battery case is improved.

In addition, the liquid cooling plate 2 is arranged far away from the tray 11 and is positioned above the battery, so that deformation leakage of the liquid cooling plate caused by impact of broken stones, curbstones and the like can be effectively avoided, long-time effectiveness of the liquid cooling system is ensured, and safety of the battery pack is improved.

Meanwhile, the cover plate 23 forming the liquid cooling plate 2 can be attached to/close to the battery in use due to the fact that the surface is flat, the effective heat dissipation area can be enlarged on the heat rising path, and the overall heat dissipation capacity of the liquid cooling battery box is further improved.

Example 5

As shown in fig. 1 to 11, in the liquid-cooled battery box of the present embodiment, in addition to embodiment 4, the tray 11 is provided with a sleeve 13 that is fitted to the joint member 3.

Specifically, referring to fig. 6, the sleeve 13 is configured to be provided with the passageway with the adaptation of joint component 3 appearance, and sleeve 13 welds in tray 11 outer wall, and during the use, liquid cooling board 2 realizes the location through the cooperation of joint component 3 and sleeve 13, realizes the location of liquid cooling board 2 in the case 1 through the cooperation of extension board 31 and tray 11, makes the setting structure of liquid cooling board 2 stable, and the relative case 1's fixed in position improves the structural stability of liquid cooling board 2, and then ensures the steady use of liquid cooling battery box, is favorable to improving battery package security.

In addition, the liquid cooling plate 2 is arranged close to the side of the box cover 12, the sleeve 13 is positioned on the outer wall of the tray 11, so that cooling liquid is input from a low position to a high position and is output from the high position to the low position, the position of the cooling liquid input and output box shell 1 is closer to the bottom of the liquid cooling battery box, the cooling liquid can enter the box shell 1 to play a role in a lower position, and under the condition of the same heat dissipation effect, the power requirement of an external cooling liquid supply mechanism is reduced.

Example 6

As shown in fig. 1 to 11, in the liquid-cooled battery box of this embodiment, on the basis of embodiment 1, the tray 11 and the box cover 12 are respectively provided with a frame 14 extending toward the outside of the box casing 1, and the tray 11 and the box cover 12 are detachably connected through the frame 14.

Specifically, frame 14 extends outward towards case 1, makes tray 11 and case lid 12 connect the back, and the junction does not occupy case 1 inner space to form comparatively regular inner chamber in case 1, can with the regular battery module adaptation of cuboid, slice isotructure, improve case 1 inner space utilization.

Preferably, the tray 11 is formed with a first connecting portion 111 in the position of the frame 14 in a recessed or protruding manner, the case cover 12 is provided with a second connecting portion 121 in the position of the frame 14, the first connecting portion 111 and the second connecting portion 121 are combined to form a joint mounting cavity 6, the liquid cooling plate 2 is provided with an extending portion 24, the extending portion 24 is disposed in the joint mounting cavity 6, and the joint member 3 is connected to the extending portion 24.

In this embodiment, the tray 11 is recessed toward the inside of the case 1 at the frame 14 to form the first connection portion 111, the case cover 12 is protruded toward the outside of the case 1 at the frame 14 to form the second connection portion 121, after the first connection portion 111 and the second connection portion 121 are buckled, the joint installation cavity 6 is formed, and the installation position of the joint member 3 independent of the battery installation cavity 5 is formed, so that the joint member 3 and the battery module 7 are arranged in a partitioned manner, the influence of the leakage of the cooling liquid on the battery module 7 is avoided, and meanwhile, in the thickness direction of the case 1, the joint installation cavity 6 is arranged closer to the case cover 12 side, the extension length of the joint member 3 can be shortened through the joint member 3, the flowing distance of the cooling liquid in the internal and external exchange process of the case 1 is reduced, the utilization efficiency of the cooling liquid is improved, and the energy consumption for conveying the cooling liquid is further reduced.

Further, the extending portion 24 is a protruding portion formed by extending the edge of the liquid cooling plate 2 along the plate surface, the extending portion 24 is disposed in the joint mounting cavity 6, and the joint member 3 is connected to the extending portion 24. So that the joint member 3 is provided without occupying the space of the battery mounting chamber 5.

Specifically, the joint member 3 includes a liquid inlet joint 32 and a liquid outlet joint 33, referring to fig. 5-6, the liquid inlet joint 32 and the liquid outlet joint 33 are located in the same joint installation cavity 6, it can be understood that the liquid inlet joint 32 and the liquid outlet joint 33 may also be respectively disposed in different joint installation cavities 6 according to practical situations, and the liquid cooling plate 2 may be provided with one or more extension parts 24 according to practical situations to form liquid cooling battery boxes with different structural styles, so as to implement adaptation of the liquid cooling battery boxes to different enveloping environments.

Preferably, the extension portion 24 is provided with a liquid inlet channel converging portion 211 and/or a liquid outlet channel converging portion 212 which are communicated with the liquid cooling channel 21, the liquid inlet channel converging portion 211 is used for being connected with the liquid inlet connector 32, the liquid outlet channel converging portion 212 is used for being connected with the liquid outlet connector 33, so that the input cooling liquid is dispersed from the extension portion 24, the output cooling liquid is output after being converged at the extension portion 24, the effective heat dissipation of all the positions in the case 1 is realized, in addition, the arrangement of the extension portion 24 does not occupy the space of the battery mounting cavity 5, the coverage surface of the liquid cooling plate 2 can be further enlarged, and the overall heat dissipation capability of the liquid cooling battery case is further improved.

Example 7

As shown in fig. 12 to 13, the power battery pack has the above-described liquid-cooled battery box in which a plurality of battery modules 7 are arranged.

According to the power battery pack, the liquid cooling battery box with the integrated structure of the cooling liquid inlet and outlet of the liquid cooling system and the cooling liquid inlet and outlet of the battery pack shell is adopted, the influence of the liquid cooling structure on the whole volume of the power battery pack is reduced, the heat dissipation capacity of the liquid cooling plate 2 is high, the whole safety and the energy density of the power battery pack are improved, and the power battery pack can be suitable for the installation of batteries such as a battery module 7 and a blade battery.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (13)

1. The liquid cooling battery box is characterized by comprising a box shell (1), wherein a liquid cooling plate (2) is arranged in the box shell (1), a liquid cooling flow channel (21) is arranged in the liquid cooling plate (2), a joint component (3) is arranged in the liquid cooling plate (2), the joint component (3) is communicated with the liquid cooling flow channel (21), and the joint component (3) is configured to penetrate through the box shell (1).

2. The liquid-cooled battery box according to claim 1, wherein an extension plate (31) is provided on the outer wall of the joint member (3), and the extension plate (31) is in sealing connection with the inner wall of the box casing (1) to increase the contact surface of the joint member (3) and the box casing (1).

3. The liquid-cooled battery box according to claim 2, characterized in that a sealing member (4) is provided between the extension plate (31) and the inner wall of the box casing (1).

4. A liquid-cooled battery box according to any one of claims 1-3, wherein the liquid-cooled plate (2) comprises a runner plate (22) and a cover plate (23), the runner plate (22) is provided with a punching runner, the runner plate (22) and the cover plate (23) are buckled and connected to form the liquid-cooled runner (21), and the joint member (3) is vertically connected to the cover plate (23) so as to reduce the internal space occupied by the joint member (3) in the box casing (1).

5. The liquid-cooled battery box according to claim 4, wherein the inner wall of the joint member (3) is smoothly transited to the punched flow passage.

6. The liquid-cooled battery box according to claim 4, wherein the box casing (1) comprises a tray (11) and a box cover (12), and the liquid-cooled plate (2) and the tray (11) define a battery mounting cavity (5).

7. The liquid-cooled battery box of claim 6, characterized in that the flow field plate (22) is disposed on a side adjacent to the box cover (12).

8. The liquid-cooled battery box according to claim 6, characterized in that the tray (11) is provided with a sleeve (13) adapted to the joint member (3).

9. The liquid-cooled battery box according to claim 6, wherein the tray (11) and the box cover (12) are respectively provided with a frame (14) extending outwards of the box shell (1), and the tray (11) and the box cover (12) are detachably connected through the frame (14).

10. The liquid-cooled battery box according to claim 9, wherein the tray (11) is recessed or protruding at the frame (14) to form a first connecting portion (111), the box cover (12) is provided with a second connecting portion (121) at the frame (14), the first connecting portion (111) and the second connecting portion (121) are combined to form a joint mounting cavity (6), the liquid cooling plate (2) is provided with an extending portion (24), the extending portion (24) is arranged in the joint mounting cavity (6), and the joint member (3) is connected to the extending portion (24).

11. The liquid-cooled battery box according to claim 10, characterized in that the joint member (3) comprises a liquid inlet joint (32) and/or a liquid outlet joint (33).

12. The liquid cooled battery box according to claim 11, characterized in that the extension (24) is provided with a liquid inlet channel convergence (211) and/or a liquid outlet channel convergence (212), the liquid inlet channel convergence (211) is used for connecting the liquid inlet joint (32), and the liquid outlet channel convergence (212) is used for connecting the liquid outlet joint (33).

13. A power battery pack, characterized by comprising the liquid cooling battery box according to any one of claims 1-12, wherein a plurality of battery modules (7) are arranged in the liquid cooling battery box.