CN220324678U - Battery pack - Google Patents

Abstract

The application discloses battery package relates to battery technology field, including the bottom plate and set up the roof beam on the bottom plate, the position that the bottom plate corresponds the roof beam is provided with the weeping passageway, and the weeping passageway link up and set up between the inner chamber and the external environment of battery package, and the position of weeping passageway is enclosed to have the weeping valve. Through the structural design, the liquid leakage valve is additionally arranged on the bottom plate of the battery pack, so that liquid leakage can be timely discharged when liquid leakage occurs in the battery pack, and the liquid leakage valve can be kept in a closed state under the condition that liquid leakage does not occur in the battery pack, so that the tightness of the battery pack is ensured; in addition, the position of the bottom plate corresponding to the beam is provided with a liquid leakage channel and a liquid leakage valve, so that heat dissipation of the battery is not affected, the influence on the structural strength of the battery pack can be reduced, and the containing space is conveniently provided for the liquid leakage valve so as to avoid increasing the Z-direction height of the whole battery pack.

Description

Battery pack

Technical Field

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

Background

When liquid leakage occurs in the battery pack and leaked liquid (the leaked liquid may be cooling liquid, electrolyte and the like) is accumulated in the battery pack and cannot be discharged in time, a series of failure problems such as battery short circuit and the like are caused.

Disclosure of Invention

It is a primary object of the present application to overcome at least one of the above-mentioned drawbacks of the prior art.

In order to achieve the above object, according to one aspect of the present application, a battery pack capable of timely discharging leakage liquid in the battery pack is provided, and the following technical scheme is specifically adopted:

the battery pack comprises a bottom plate and a beam arranged on the bottom plate, wherein a liquid leakage channel is arranged at the position of the bottom plate corresponding to the beam, the liquid leakage channel is communicated between an inner cavity of the battery pack and the external environment, and a liquid leakage valve is arranged at the position of the liquid leakage channel in a surrounding mode.

Compared with the prior art, the technical scheme has the following beneficial effects:

1. by additionally arranging the liquid leakage valve on the bottom plate of the battery pack, the liquid leakage can be timely discharged when the liquid leakage occurs in the battery pack, and the liquid leakage valve can be kept in a closed state under the condition that the liquid leakage does not occur in the battery pack, so that the tightness of the battery pack is ensured;

2. the bottom plate is generally arranged as a cold plate, and a cooling flow channel is arranged at a position of the cold plate, which is not corresponding to the beam, for radiating the battery, so that the liquid leakage valve is arranged at a position, which is opposite to the beam, of the bottom plate, the liquid leakage valve can be prevented from being arranged at the position of the cooling flow channel, and the radiating of the battery is not influenced;

3. the strength of the position of the bottom plate opposite to the beam is higher than that of other areas of the bottom plate, so that the liquid leakage valve is arranged at the position of the bottom plate opposite to the beam, and the structural strength of the battery pack can be effectively ensured;

4. when the liquid leakage valve is arranged on the bottom plate, part of the liquid leakage valve stretches into the inner cavity of the battery pack, so that a certain Z-direction height space is required to be arranged to match the installation of the liquid leakage valve; in order to ensure the maximum capacity of the battery and the maximized space utilization rate in the lifting battery pack, the battery is arranged at the position where the bottom plate is not opposite to the beam, if the liquid leakage valve is arranged at the position where the bottom plate is not opposite to the beam, namely the liquid leakage valve is arranged below the battery, the height of the battery is likely to be raised, and then the height of the whole battery pack is increased.

Drawings

In order that the advantages of the utility model will be readily understood, a more particular description of the utility model briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the application and are not therefore to be considered to be limiting of its scope, the application will be described and explained with additional specificity and detail through the use of the accompanying drawings.

Fig. 1 is a schematic view illustrating an internal structure of a battery pack according to an embodiment of the present application;

fig. 2 is a schematic structural view of a drain valve mounted on a battery pack according to an embodiment of the present disclosure;

FIG. 3 is an enlarged schematic view of the partial structure A of FIG. 2;

FIG. 4 is a schematic view of a structure in which a drain valve is mounted on a base plate according to an embodiment of the present disclosure;

fig. 5 is a schematic view of another embodiment of the present disclosure in which a drain valve is mounted on a base plate.

The reference numerals are as follows:

1-a bottom plate, 11-a cooling runner and 12-a liquid collecting tank;

2-side beams;

3-a cross beam;

4-longitudinal beams and 41-liquid discharge holes;

the sealing device comprises a 5-liquid leakage valve, a 51-shell, a 511-liquid inlet, a 512-opening, a 52-base, a 53-clamping part, a 54-mounting sleeve, a 55-blocking part, a 56-water-soluble expansion structure, a 57-spring, a 58-first sealing ring and a 59-second sealing ring;

6-cell.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. However, it will be apparent to one skilled in the art that embodiments of the present application may be practiced without one or more of these details. In other instances, some features that are well known in the art have not been described in order to avoid obscuring the embodiments of the present application.

In the description of the present application, the term "a and/or B" means all possible combinations of a and B, such as a alone, B alone or a and B, the term "at least one a or B" or "at least one of a and B" has a meaning similar to "a and/or B" and may include a alone, B alone or a and B; the singular forms "a", "an" and "the" include plural referents; the terms "inboard," "outboard," "longitudinal," "transverse," "upper," "lower," "top," "bottom," and the like are used in the sense of orientation or positional relationship shown based on the drawings, and are merely for convenience of description of the present application and do not require that the present application must be constructed and operated in a particular orientation and therefore should not be construed as limiting the present application; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. In addition, the term "exemplary" means "serving as an example, embodiment, or illustration," any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments, and although various aspects of the embodiments are shown in the figures, the figures are not necessarily drawn to scale unless specifically indicated. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In order to facilitate understanding of the battery pack provided by the application, first, an application scene of the battery pack is described, and in the prior art, when liquid leakage occurs in the battery pack and leaked liquid is accumulated in the battery pack and cannot be discharged in time, a series of failure problems such as battery short circuit and the like can be caused. Therefore, the application provides a battery pack for solving the problem that leakage in the battery pack cannot be discharged in time in the prior art.

Embodiments of the present application are described in further detail below with reference to the accompanying drawings:

examples

Referring to fig. 1 to 5, the present embodiment provides a battery pack, including a bottom plate 1 and a beam disposed on the bottom plate 1, the position of the bottom plate 1 corresponding to the beam is provided with a liquid leakage channel, the liquid leakage channel is disposed between an inner cavity of the battery pack and an external environment in a penetrating manner, and the position of the liquid leakage channel is enclosed with a liquid leakage valve 5.

The beam comprises side beams 2 surrounding the periphery of the battery in the battery pack and a reinforcing beam arranged in the battery pack, and the reinforcing beam generally comprises a cross beam 3 and a longitudinal beam 4. The bottom plate 1 is generally a cold plate, and the position of the cold plate, which is not opposite to the beam, is generally provided with a cooling flow channel 11 for radiating heat of the battery 6 in the battery pack, if a liquid leakage channel is formed in the position and a liquid leakage valve 5 is additionally arranged in the position, the cooling flow channel 11 needs to be modified, so that the heat radiation of the battery can be influenced; besides, the position of the bottom plate 1 corresponding to the beam needs to be connected with the beam, so that the strength of the position is generally higher than that of the position, which is not opposite to the beam, of the bottom plate 1, and the structure strength of the battery pack can be effectively ensured by arranging the liquid leakage channel and the liquid leakage valve 5 at the position, which is opposite to the beam, of the bottom plate 1; the roof beam is equipped with the die cavity generally, and when the weeping valve 5 set up on bottom plate 1, partial weeping valve 5 stretches into in the inner chamber of battery package, and the die cavity in the roof beam can provide the accommodation space that holds weeping valve 5, can avoid increasing the Z to the height of whole battery package.

Through the structural design, the liquid leakage valve 5 is additionally arranged on the bottom plate 1 of the battery pack, so that liquid leakage can be timely discharged when liquid leakage occurs in the battery pack, and the liquid leakage valve 5 can be kept in a closed state under the condition that liquid leakage does not occur in the battery pack, so that the tightness of the battery pack is ensured; in addition, the position of the bottom plate 1 corresponding to the beam is provided with a liquid leakage channel and a liquid leakage valve 5, so that the heat dissipation of the battery 6 is not influenced, the influence on the structural strength of the battery pack can be reduced, and the accommodating space is conveniently provided for the liquid leakage valve 5 so as to avoid increasing the Z-direction height of the whole battery pack.

Further, as shown in fig. 2 and 3, the weep valve 5 is at least partially housed inside the beam.

After the drain valve 5 is disposed on the bottom plate 1, the beam needs to be modified because the drain valve 5 has a certain height in the Z direction, and specifically, a space capable of accommodating the drain valve 5 may be formed at a position where the beam is opposite to the drain valve 5. Through above-mentioned structural design, in order to match the installation of weeping valve 5, only need the roof beam design have hold weeping valve 5 the space can, processing is simple, low cost to can avoid increasing the Z to the height of whole battery package.

Further, as shown in fig. 1, a drain hole 41 for facilitating the liquid leakage to enter the position of the liquid leakage valve 5 is arranged between the bottom plate 1 and the beam, and the drain hole 41 is a gap formed on the avoiding part of the bottom plate 1 and/or the beam.

Since the drain valve 5 is at least partially accommodated in the beam, the drain hole 41 needs to be designed so that the drain in the inner cavity of the battery pack can smoothly enter the position of the drain valve 5 through the drain hole 41 and then be discharged to the outside of the battery pack through the drain valve 5. The structure of the drain hole 41 is not limited herein, and may be a combination of a relief portion formed only in the bottom plate 1, a notch formed only in the beam, or a combination of a relief portion formed in the bottom plate 1 and a notch formed in the beam. If the drain valve 5 is disposed below the side beam 2 on the outer peripheral side of the battery pack, the drain hole 41 is opened only on the side of the side beam 2 facing the inner cavity of the battery pack; if the liquid leakage valve 5 is arranged below the reinforcing beam inside the battery pack, the liquid discharge holes 41 are formed in the two sides of the reinforcing beam, so that liquid leakage on the two sides of the reinforcing beam can enter the position of the liquid leakage valve 5, the discharge speed of the liquid leakage is improved, and timely liquid discharge is facilitated.

In one implementation of this embodiment, as shown in fig. 2 and 3, a liquid collecting tank 12 is disposed on a side of the bottom plate 1 facing the inner cavity of the battery pack, the liquid collecting tank 12 is disposed in a concave manner toward a side facing away from the inner cavity of the battery pack, and the liquid leakage channel is at least partially disposed within the liquid collecting tank 12.

Wherein the liquid leakage in the inner cavity of the battery pack can be collected by the liquid collecting tank 12. The liquid leakage channel is designed in the liquid collecting tank 12, so that the liquid leakage accumulated in the liquid collecting tank 12 can be discharged in time; of course, the leakage channel is also equipped with a leakage valve 5.

Further, the size of the liquid collecting groove 12 in the first direction is larger than the size of the liquid collecting groove 12 in the Liang Zaidi direction, so that a notch for communicating the inner cavity of the battery pack with the liquid collecting groove 12 is formed between the liquid collecting groove 12 and the beam, and the beam is formed with a notch on at least one side in the first direction; the plane where the arrangement direction of the bottom plate 1 and the beams and the extending direction of the beams are located together is set as a first plane, and the first direction is perpendicular to the first plane.

The dimension of the sump 12 in the first direction may be understood as the width dimension of the sump 12 and the dimension of the beam in the first direction may be understood as the width dimension of the beam. The notch is used as a current collecting part for collecting leakage liquid, the leakage liquid in the inner cavity of the battery pack can be introduced into and accumulated in the liquid collecting groove 12 through the notch, and the leakage liquid can be discharged by utilizing the leakage liquid valve 5 arranged in the liquid collecting groove 12. If the liquid collecting tank 12 is arranged below the side beam 2 on the outer periphery side of the battery pack, a notch is formed only on one side of the side beam 2 facing the inner cavity of the battery pack; if the liquid collecting tank 12 is arranged below the reinforcing beam in the battery pack, the notches are formed in the two sides of the reinforcing beam, so that liquid leakage on the two sides of the reinforcing beam can enter the liquid collecting tank 12, the discharge speed of the liquid leakage is improved, and timely liquid discharge is facilitated. In this embodiment, the notch may be a relief portion formed on the bottom plate 1, and may be used as the drain hole 41 or a part of the drain hole 41.

Preferably, the dimension a of the slot in the first direction ranges from: a is more than or equal to 3mm and less than or equal to 10mm, as shown in figure 3. In the present embodiment, the dimension a of the notch in the first direction can be understood as the width dimension a of the notch. The width of the notch needs to be set in a reasonable range, if the width of the notch is too large, the placement of the battery in the battery pack is affected, or the position space of the cooling flow channel 11 on the bottom plate 1 for cooling the battery 6 is occupied, and if the width of the notch is too small, the speed of the leaked liquid entering the liquid collecting tank 12 is affected.

By way of example, one design of sump 12 may be: the liquid collecting tanks 12 are multiple and are arranged at intervals, and each liquid collecting tank 12 is provided with at least one liquid leakage channel; of course, the leakage channel is also equipped with a leakage valve 5. The plurality of liquid collecting tanks 12 are designed to be arranged at intervals, and the liquid collecting tanks 12 can be arranged at a plurality of positions in the battery pack by using the design, so that the liquid leakage at all positions in the battery pack can be accumulated in each corresponding liquid collecting tank 12 in time when the battery pack leaks.

By way of example, another design of sump 12 may be: the number of the liquid collecting grooves 12 is one, the number of the liquid leakage channels is multiple, and the liquid collecting grooves 12 are shared by the liquid leakage channels; of course, the leakage channel is also equipped with a leakage valve 5. Only one liquid collecting groove 12 is arranged in the battery pack, and the liquid collecting groove 12 needs to have a large enough space for containing leaked liquid so as to meet the requirement that the leaked liquid can be accumulated in the liquid collecting groove 12 in time when the leaked liquid in the battery pack is leaked; in addition, the liquid collecting tank 12 is shared by a plurality of liquid leakage channels, so that the liquid discharging efficiency can be improved.

The above embodiments of the liquid collecting tank 12 are exemplified, and the number and layout of the liquid collecting tanks 12 can be set according to the specific structure of the battery pack, which is not limited herein, and the design of the liquid collecting tanks 12 is mainly considered to facilitate the rapid and easy accumulation of the liquid leaking from the inner cavity of the battery pack into the liquid collecting tank 12.

Further, as shown in fig. 1 and 2, the bottom plate 1 is a cold plate, the cold plate is provided with a cooling flow channel 11, the liquid collecting groove 12 and the cooling flow channel 11 are arranged in a staggered manner, and the liquid collecting groove 12 extends along a direction parallel to the extending direction of the cooling flow channel 11.

Wherein, the cooling runner 11 is generally disposed on the bottom plate 1 and below the battery 6 for cooling the battery 6; the liquid collecting tank 12 is arranged on the bottom plate 1 and below the beam, the liquid collecting tank 12 is arranged in a staggered way with respect to the cooling flow channel 11, and the extending direction of the liquid collecting tank 12 is parallel to the extending direction of the cooling flow channel 11. This kind of structural design makes the setting of collecting vat 12 can not influence the setting of cooling runner 11, avoids influencing the arrangement of cooling runner 11, consequently can not influence the cooling effect of battery 6.

Further, the liquid collecting tank 12 is provided opposite to the beam, and the liquid collecting tank 12 is provided to extend in a direction parallel to the extending direction of the beam.

Wherein the sump 12 is located below the beam and the extending direction of the sump 12 is parallel to the extending direction of the beam, in this embodiment the extending direction of the sump 12 may be understood as the length direction of the sump 12 and the extending direction of the beam may be understood as the length direction of the beam. The structural design ensures that the liquid collecting groove 12 does not occupy too much installation space of the battery 6 in the battery pack; moreover, since the structural strength of the bottom plate 1 corresponding to the lower part of the beam is generally large, the volume of the liquid collecting tank 12 can be designed to be larger so as to be capable of accommodating more liquid leakage; in addition, the cooling flow channels 11 are not generally arranged below the beam, and the arrangement of the cooling flow channels 11 can be prevented from being influenced by the arrangement of the liquid collecting grooves 12, so that the cooling effect of the battery 6 is not influenced.

In one implementation of this embodiment, as shown in fig. 4 and 5, a specific structure of the liquid leakage valve 5 may be: the liquid leakage valve 5 comprises a valve core assembly, a shell 51 and a connecting piece, wherein the valve core assembly is arranged in an inner cavity of the shell 51, and the shell 51 penetrates through a liquid leakage channel and is fixed on the bottom plate 1 through the connecting piece.

By way of example, one specific configuration of the connector may be: as shown in fig. 4, the connector includes a base 52 and a clamping portion 53, the base 52 is fixed on the housing 51, the base 52 can be abutted against one side of the bottom plate 1 facing away from the inner cavity of the battery pack, the clamping portion 53 is elastically connected on the housing 51, the clamping portion 53 can be abutted against one side of the bottom plate 1 facing the inner cavity of the battery pack, and the bottom plate 1 is clamped by the base 52 and the clamping portion 53 to fix the drain valve 5 on the bottom plate 1.

The clamping portion 53 may be an elastic piece with a certain elasticity, wherein one end of the elastic piece far away from the base 52 is fixedly connected with the housing 51, one end of the elastic piece near the base 52 is far away from the housing 51, and the end can be abutted against one side of the bottom plate 1 facing the inner cavity of the battery pack; when the drain valve 5 is assembled on the bottom plate 1, one end of the drain valve 5 far away from the base 52 penetrates through the drain channel from the external environment to the inner cavity of the battery pack, in the process, the elastic sheet is extruded by the drain channel and contracts towards the shell 51, when the elastic sheet completely enters the inner cavity of the battery pack, one end of the elastic sheet close to the base 52 is opened away from the shell 51, at the moment, one end of the elastic sheet close to the base 52 is abutted against one side of the bottom plate 1 facing the inner cavity of the battery pack, and at the same time, one end of the base 52 close to the elastic sheet is abutted against one side of the bottom plate 1 facing away from the inner cavity of the battery pack, and under the common clamping of the elastic sheet and the base 52, the drain valve 5 can be fixed on the bottom plate 1. Further, in order to improve stability of the drain valve 5 after being mounted on the base plate 1, a plurality of elastic pieces may be provided on the outer periphery of the housing 51, and the base 52 may be provided around the outer periphery of the housing 51. In addition, in order to secure sealability between the housing 51 and the bottom plate 1 of the liquid leakage valve 5 after assembly, a first seal 58 may be further provided between the base 52 and the housing 51, and specifically, the first seal 58 may be provided on the base 52.

By way of example, another specific configuration of the connector may be: as shown in fig. 5, the connector comprises a base 52 and a mounting sleeve 54, the base 52 is fixed on the housing 51, the base 52 can be abutted against one side of the bottom plate 1 facing away from the inner cavity of the battery pack, the mounting sleeve 54 is in threaded connection with the housing 51, the mounting sleeve 54 can be abutted against one side of the bottom plate 1 facing toward the inner cavity of the battery pack, and the bottom plate 1 is clamped by the base 52 and the mounting sleeve 54 to fix the liquid leakage valve 5 on the bottom plate 1.

Wherein, the inside of the installation sleeve 54 is provided with internal threads, the periphery of the shell 51 is provided with external threads, the installation sleeve 54 and the shell 51 can be connected together through the matching of the internal threads and the external threads, and the distance between the installation sleeve 54 and the base 52 can be adjusted by rotating the installation sleeve 54; when the drain valve 5 is assembled on the bottom plate 1, one end of the drain valve 5, which is far away from the base 52, penetrates through the drain channel from the external environment to the inner cavity of the battery pack, the mounting sleeve 54 is connected to the shell 51 in the inner cavity of the battery pack, so that one end of the mounting sleeve 54, which is close to the base 52, is abutted against one side of the bottom plate 1, which faces the inner cavity of the battery pack, and one end of the base 52, which is close to the mounting sleeve 54, is abutted against one side of the bottom plate 1, which faces away from the inner cavity of the battery pack, and the drain valve 5 can be fixed on the bottom plate 1 under the common clamping of the mounting sleeve 54 and the base 52. It should be noted that the mounting sleeve 54 may also be provided with a through hole, and after the mounting sleeve 54 is assembled with the housing 51, the through hole is communicated with the liquid inlet 511 on the housing 51, so as to avoid the mounting sleeve 54 blocking the liquid inlet 511 and preventing the leakage of liquid. Likewise, the base 52 may be circumferentially provided on the outer periphery of the housing 51 to improve the stability of the drain valve 5 after being mounted on the bottom plate 1; in addition, in order to ensure tightness between the housing 51 and the bottom plate 1 of the assembled drain valve 5, a first seal ring 58 may be further disposed between the base 52 and the housing 51, specifically, a first annular groove is disposed at an end of the base 52 facing the bottom plate 1, and the first seal ring 58 is disposed in the first annular groove in an embedded manner.

The specific structure of the two connectors given above is exemplary, and the specific structure of the connectors is not limited herein, and it is mainly considered that the design of the connectors facilitates the fixation of the weep valve 5 to the bottom plate 1.

Further, the inner cavity of the housing 51 has an opening 512 communicating with the external environment, an inner top surface disposed opposite to the opening 512, and a liquid inlet 511 opened on the outer peripheral wall of the housing 51 and communicating with the inner cavity of the battery pack. The opening 512 on the housing 51 and the liquid inlet 511 form a channel for discharging the liquid leakage in the inner cavity of the battery pack to the external environment, and the valve core assembly is installed in the inner cavity of the housing 51, so that the liquid leakage in the inner cavity of the battery pack can enter the valve core assembly from the liquid inlet 511 and then be discharged from the opening 512 to the external environment through the valve core assembly. In order to improve the drainage efficiency, a plurality of liquid inlet holes 511 may be formed in the outer circumference of the housing 51.

By way of example, one specific construction of the valve cartridge assembly may be: as shown in fig. 4 and 5, the valve core assembly includes a blocking portion 55, a water-soluble expansion structure 56 and a spring 57, the blocking portion 55 is disposed at the opening 512, the water-soluble expansion structure 56 is disposed between the blocking portion 55 and the inner top surface, and the spring 57 penetrates the water-soluble expansion structure 56 and is connected between the blocking portion 55 and the inner top surface.

The water-soluble expansion structure 56 can absorb the leakage, and expands after absorbing the leakage, so that the volume is increased, and the water-soluble expansion structure 56 expands between the inner top surface of the shell 51 and the plugging portion 55 to drive the plugging portion 55 to move; the water-soluble expansion structure 56 is disposed in the inner cavity of the housing 51 and corresponds to the liquid inlet 511 formed on the housing 51, so that the leaked liquid can directly enter the water-soluble expansion structure 56 from the liquid inlet 511. The plugging part 55 is matched with the opening 512 of the shell 51 for use and mainly plays a role of plugging the opening 512 of the shell 51 so as to close a channel between the inner cavity of the battery pack and the external environment; of course, the blocking portion 55 may also move and open the opening 512 when the water-soluble swelling structure 56 swells to open a passage between the inner cavity of the battery pack and the external environment. In order to ensure the tightness of the drain valve 5 in the closed state, a second seal ring 59 may be provided between the seal portion 55 and the housing 51, and specifically, a second annular groove may be provided on the outer periphery of the seal portion 55, and the second seal ring 59 may be fitted into the second annular groove.

In the present embodiment, the drain valve 5 includes a first state and a second state, and the drain valve 5 can be switched between the first state and the second state by the valve element assembly provided above. Specifically, the first state is: the blocking part 55 blocks the opening 512 under the action of the spring 57 so that the inner cavity of the battery pack is not communicated with the external environment due to the blocking of the liquid leakage valve 5; it can be seen that the first state of the drain valve 5 is the closed state of the drain valve 5, so as to ensure the tightness of the inner cavity of the battery pack. The second state is: the leaked liquid enters the water-soluble expansion structure 56 through the liquid inlet 511, and the water-soluble expansion structure 56 absorbs liquid and expands, so that the blocking part 55 is driven to move against the acting force of the spring 57 and separate from the opening 512, and the inner cavity of the battery pack and the external environment can be communicated through the liquid leakage valve 5; it is known that the second state of the drain valve 5 is the open state of the drain valve 5, so that the drain in the battery pack can be discharged to the outside of the battery pack.

The embodiment provides a battery pack, which is characterized in that a liquid leakage valve 5 is additionally arranged on a bottom plate 1 of the battery pack, so that liquid leakage can be timely discharged when liquid leakage occurs in the battery pack; moreover, the liquid leakage valve 5 is arranged at the position of the bottom plate 1 corresponding to the beam, and the requirement of containing the Z-directional height of the liquid leakage valve can be met only by designing enough space on the beam so as to avoid increasing the Z-directional height of the whole battery pack; besides, the installation position of the drain valve 5 on the bottom plate 1 does not affect the arrangement of the cooling flow channels 11, and the structural strength of the installation position is high, so that the cooling effect of the battery and the structural strength of the battery pack are not affected.

While the fundamental principles and main features of the present application and advantages thereof have been shown and described, it will be apparent to those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (13)

1. The battery pack comprises a bottom plate and a beam arranged on the bottom plate, and is characterized in that a liquid leakage channel is arranged at the position of the bottom plate corresponding to the beam, the liquid leakage channel is communicated between the inner cavity of the battery pack and the external environment, and a liquid leakage valve is enclosed at the position of the liquid leakage channel.

2. The battery pack of claim 1, wherein the drain valve is at least partially housed within the interior of the beam.

3. The battery pack according to claim 2, wherein a drain hole which is beneficial for liquid leakage to enter the position of the liquid leakage valve is arranged between the bottom plate and the beam, and the drain hole is a gap formed on the avoidance part on the bottom plate and/or the beam.

4. A battery pack according to any one of claims 1-3, wherein the side of the bottom plate facing the interior cavity of the battery pack is provided with a sump, which sump is recessed towards the side facing away from the interior cavity of the battery pack, and the drain channel is at least partially arranged within the sump.

5. The battery pack according to claim 4, wherein the size of the liquid collecting groove in the first direction is larger than the size of the beam in the first direction, so that a notch communicating the inner cavity of the battery pack with the liquid collecting groove is formed between the liquid collecting groove and the beam, and at least one side of the beam in the first direction is formed with the notch;

the plane where the bottom plate, the arrangement direction of the beams and the extending direction of the beams are located is set to be a first plane, and the first direction is perpendicular to the first plane.

6. The battery pack of claim 5, wherein the slot has a dimension a in the first direction in the range of: a is more than or equal to 3mm and less than or equal to 10mm.

7. The battery pack according to claim 4, wherein the liquid collecting tanks are arranged in a plurality of mutually spaced mode, and at least one liquid leakage channel is respectively arranged in each liquid collecting tank;

or the liquid leakage channels are multiple, the liquid collecting tank is one, and the liquid leakage channels share one liquid collecting tank.

8. The battery pack according to claim 4, wherein the bottom plate is a cold plate, the cold plate is provided with a cooling flow channel, the liquid collecting groove and the cooling flow channel are arranged in a staggered manner, and the liquid collecting groove is arranged in a direction parallel to the extending direction of the cooling flow channel.

9. The battery pack according to claim 4, wherein the liquid collecting groove is provided opposite to the beam, and the liquid collecting groove is provided to extend in a direction parallel to an extending direction of the beam.

10. The battery pack of claim 1, wherein the drain valve comprises a valve core assembly, a housing and a connecting piece, the valve core assembly is installed in an inner cavity of the housing, and the housing penetrates through the drain channel and is fixed on the bottom plate through the connecting piece.

11. The battery pack according to claim 10, wherein the connecting member comprises a base and a clamping portion, the base is fixed on the housing and can be abutted against one side of the bottom plate facing away from the inner cavity of the battery pack, the clamping portion is elastically connected to the housing and can be abutted against one side of the bottom plate facing toward the inner cavity of the battery pack, and the bottom plate is clamped by the base and the clamping portion to fix the liquid leakage valve on the bottom plate.

12. The battery pack of claim 10, wherein the connector comprises a base and a mounting sleeve, the base is fixed on the housing and can abut against one side of the bottom plate facing away from the cavity of the battery pack, the mounting sleeve is in threaded connection with the housing and can abut against one side of the bottom plate facing the cavity of the battery pack, and the bottom plate is clamped by the base and the mounting sleeve to fix the drain valve on the bottom plate.

13. The battery pack according to any one of claims 10 to 12, wherein the inner cavity of the housing has an opening communicating with the external environment, an inner top surface disposed opposite to the opening, and a liquid inlet hole opened on the outer peripheral wall of the housing and communicating with the inner cavity of the battery pack;

the valve core assembly comprises a blocking part, a water-soluble expansion structure and a spring, wherein the blocking part is arranged at the opening, the water-soluble expansion structure is arranged between the blocking part and the inner top surface, and the spring penetrates through the water-soluble expansion structure and is connected between the blocking part and the inner top surface;

the liquid leakage valve comprises a first state and a second state;

the first state is: the blocking part is used for blocking the opening under the action of the spring so as to prevent the inner cavity of the battery pack from being communicated with the external environment;

the second state is: the leakage liquid enters the water-soluble expansion structure through the liquid inlet hole, and the water-soluble expansion structure absorbs liquid and expands, so that the blocking part is driven to overcome the acting force of the spring and move and separate from the opening, and the inner cavity of the battery pack and the external environment can be communicated through the leakage liquid valve.