Battery housing and energy storage system

Abstract

The present disclosure relates to a battery housing and an energy storage system, which are used to solve the technical problems of high cooling cost, long immersion time and low cooling efficiency caused by the large amount of cooling liquid required in thermal runaway. The battery housing comprises a housing comprising a containing cavity adapted to contain a battery module, and a liquid limiting device arranged in the containing cavity. In a first state, the liquid limiting device is arranged between the battery module and at least part of the side wall of the containing cavity, between the liquid limiting device and part of the inner wall of the containing cavity, or the liquid limiting device itself can surround a liquid injection space, the liquid injection space encloses the battery module therein, and the liquid injection space is used to inject the cooling liquid for immersing the battery module.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of energy storage systems, in particular, to a battery housing and an energy storage system. BACKGROUND

[0002] In the related art, in the battery cabinet of an energy storage system, a sufficient electrical gap needs to be formed between the battery module and the cabinet body to avoid threatening the safety of maintenance personnel.

[0003] When thermal runaway occurs in one or more of the battery modules in the battery cabinet, cooling liquid is usually injected into the battery cabinet to prevent the spread of thermal runaway. However, a sufficient electrical gap causes a large empty space to be formed between the battery cabinet cavity wall and the battery module, resulting in a large amount of cooling liquid required to be injected into the battery cabinet, high cooling cost, long immersion time, and low cooling efficiency. SUMMARY

[0004] The purpose of the present disclosure is to provide a battery housing and an energy storage system to solve the technical problems of high cooling cost, long immersion time, and low cooling efficiency caused by the large amount of cooling liquid required when thermal runaway occurs.

[0005] To achieve the above-mentioned purpose, the present disclosure provides a battery housing, comprising: a housing comprising a containing cavity adapted to contain a battery module, and a liquid limiting device arranged in the containing cavity, in a first state, the liquid limiting device is arranged between the battery module and at least part of the side wall of the containing cavity, the liquid limiting device and part of the inner wall of the containing cavity or the liquid limiting device itself can surround a liquid injection space, the liquid injection space encloses the battery module therein, and the liquid injection space is used to inject cooling liquid for immersing the battery module.

[0006] Optionally, the containing cavity comprises a first cavity wall and a second cavity wall arranged opposite to each other, the liquid limiting device comprises a bag body, the bag body is in sealed connection with the first cavity wall, one end of the bag body facing the second cavity wall is provided with an opening for avoiding the battery module, and the bag body is adapted to stretch and contract between the first cavity wall and the second cavity wall, in a second state, the bag body is contracted and accommodated on the first cavity wall; in the first state, the bag body stretches towards the second cavity wall to form the liquid injection space.

[0007] Optionally, the first cavity wall is a bottom wall of the containing cavity, the second cavity wall is a top wall of the containing cavity, and the maximum stretching height of the bag body in the vertical direction is equal to or greater than the height of the battery module.

[0008] Optionally, a flow channel for injecting gas or liquid is arranged in the bag body.

[0009] Optionally, the outer circumferential surface of the bag body is provided with a plurality of circumferentially extending transverse reinforcing rings, and the plurality of transverse reinforcing rings are arranged in the vertical direction.

[0010] Optionally, the first cavity wall is a bottom wall of the accommodating cavity, the second cavity wall is a top wall of the accommodating cavity, the top end of the bag body is provided with a pull wire, the second cavity wall is provided with a driving member, and the driving member can drive the bag body to stretch and retract in the vertical direction through the pull wire.

[0011] Optionally, the first cavity wall is a top wall of the accommodating cavity, the second cavity wall is a bottom wall of the accommodating cavity, and the bag body can be stretched to be sealingly connected with the second cavity wall in the vertical direction.

[0012] Optionally, the first cavity wall is provided with a second magnet, the second cavity wall is provided with a third magnet, the bottom end of the bag body is provided with a first magnet, two magnetic poles of the first magnet are arranged in the vertical direction, and the liquid limiting device is configured to: in the second state, the second magnet is attracted to the first magnet; and in the first state, the second magnet is repelled from the first magnet, and the third magnet is attracted to the first magnet.

[0013] Optionally, the outer circumferential surface of the bag body is provided with a sliding block, and the accommodating cavity is further provided with a sliding rail extending in the stretching direction of the bag body, and the sliding block is slidably arranged on the sliding rail.

[0014] Optionally, the liquid limiting device comprises an inflatable structure, the inflatable structure is attached to at least one side wall of the accommodating cavity, and the liquid limiting device is configured to: in the first state, the inflatable structure is inflated towards the battery module; and in the second state, the inflatable structure is in an un-inflated state and tightly attached to the side wall of the accommodating cavity.

[0015] Optionally, the inflatable structure is provided with a transverse limiting belt and / or a longitudinal limiting belt.

[0016] On the basis of the above technical solutions, the present disclosure further provides an energy storage system, comprising: the battery shell in the above technical solutions, a battery module accommodated in the accommodating cavity, and a thermal management module comprising an inlet liquid pipeline and an outlet liquid pipeline in fluid communication with the accommodating cavity.

[0017] Optionally, the battery module comprises a plurality of batteries arranged in a stack, and a cooling liquid flow channel for flowing cooling liquid is arranged between two adjacent batteries.

[0018] Optionally, the heat management module further comprises a heat exchange pipe arranged in the accommodating cavity and fixedly connected to the top wall of the accommodating cavity, the heat exchange pipe being in fluid communication between the liquid inlet pipeline and the accommodating cavity, a water tank arranged at the bottom of the accommodating cavity and used for collecting the cooling liquid condensed on the surface of the heat exchange pipe, the liquid outlet pipeline being in fluid communication with the water tank, and a circulating power device used for pumping the cooling liquid in the liquid inlet pipeline to the heat exchange pipe.

[0019] By the above technical solution, the battery shell provided by the present disclosure is provided with a liquid limiting device. When the battery module accommodated in the battery shell is in thermal runaway, the liquid limiting device can be in a first state to block between the battery module and at least part of the side wall of the accommodating cavity, so as to enclose a liquid injection space in which the battery module is surrounded. After the cooling liquid is injected into the liquid injection space, the liquid level of the cooling liquid can quickly rise to immerse the battery module. Compared with the case where the battery shell is not provided with the liquid limiting device, the volume of the cooling liquid required to immerse the battery module is reduced, the cooling cost is reduced, the liquid level rising speed is accelerated, the time required to immerse the battery module is shortened, and the cooling efficiency is improved. The energy storage system provided by the present disclosure has the same technical effects as the battery shell in the above technical solution. In order to avoid unnecessary repetition, details are not described here.

[0020] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and together with the specific embodiments below, serve to explain the present disclosure but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 is a structural schematic diagram of a battery shell in the first embodiment of the present disclosure, wherein the liquid limiting device is in a second state;

[0023] Figure 2 is a structural schematic diagram of a battery shell in the first embodiment of the present disclosure, wherein the liquid limiting device is in a first state;

[0024] Figure 3 is a structural schematic diagram of a liquid limiting device in the first embodiment of the present disclosure, wherein the liquid limiting device is in a second state;

[0025] Figure 4 is a structural schematic diagram of a liquid limiting device in the second embodiment of the present disclosure, wherein the liquid limiting device is in a first state;

[0026] Figure 5 is a structural schematic diagram of a liquid limiting device in the third embodiment of the present disclosure, wherein the liquid limiting device is in a first state;

[0027] Figure 6 is a structural schematic diagram of a liquid limiting device in a fourth embodiment of the present disclosure, wherein the liquid limiting device is in a first state;

[0028] Figure 7 is a structural schematic diagram of a liquid limiting device cooperating with a battery shell in a fifth embodiment of the present disclosure, wherein the liquid limiting device is in a first state;

[0029] Figure 8 is a structural schematic diagram of a liquid limiting device in a sixth embodiment of the present disclosure, wherein the liquid limiting device is in a first state;

[0030] Figure 9 is a top perspective view of a battery shell in a seventh embodiment of the present disclosure, wherein the liquid limiting device is in a second state;

[0031] Figure 10 is a top perspective view of a battery shell in a seventh embodiment of the present disclosure, wherein the liquid limiting device is in a first state;

[0032] Figure 11 is a connection principle diagram of a thermal management module and a battery shell in the specific embodiment of the present disclosure.

[0033] Legend of reference signs

[0034] 1 - shell, 10 - bottom platform, 11 - containing cavity,

[0035] 2 - battery module, 20 - battery,

[0036] 3 - thermal management module, 31 - liquid inlet pipeline, 32 - liquid outlet pipeline, 33 - heat exchange pipe, 34 - water tank, 35 - circulating power device,

[0037] 4 - liquid limiting device, 40 - expandable structure, 41 - bag body, 411 - bottom, 412 - wall part, 413 - transverse reinforcing ring, 414 - pull wire, 42 - second magnet, 43 - fourth magnet, 44 - third magnet, 45 - first magnet. Specific embodiment

[0038] The specific embodiment of the present disclosure is described in detail below in combination with the drawings. It should be understood that the specific embodiment described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0039] In the present disclosure, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the battery housing in the normal first state, and "inner" and "outer" refer to the inner and outer relative to the contour of the corresponding component itself, unless otherwise stated. The terms "first", "second", and the like used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, the following description refers to the drawings, and the same numbers in different drawings represent the same or similar elements, unless otherwise indicated.

[0040] According to the specific embodiment of the present disclosure, a battery housing is provided, referring to Figures 1 to 11 the battery housing can include a housing 1 and a liquid limiting device 4, wherein the housing 1 can include a receiving cavity 11 adapted to accommodate a battery module 2, the receiving cavity 11 can be provided with a liquid inlet and a liquid outlet, the liquid inlet is adapted to guide the cooling liquid into the receiving cavity 11, and the liquid outlet is adapted to discharge the cooling liquid in the receiving cavity 11, the liquid limiting device 4 can be arranged in the receiving cavity 11 and has a first state and a second state described below, in the first state, the liquid limiting device 4 can be arranged between the battery module 2 and at least part of the side wall of the receiving cavity 11, between the liquid limiting device 4 and part of the inner wall of the receiving cavity 11, or the liquid limiting device 4 itself can surround the liquid injection space formed therein, which is used to inject the cooling liquid for immersing the battery module 2.

[0041] It should be noted that the inner wall of the receiving cavity 11 includes a top wall and a bottom wall extending substantially in the horizontal direction, and a side wall extending substantially in the vertical direction, for example, when the receiving cavity 11 is in the shape of a rectangular parallelepiped, the receiving cavity 11 can have a top wall, a bottom wall and four side walls, and when the receiving cavity 11 is in the shape of a cylinder, the receiving cavity 11 can have a top wall, a bottom wall and a circular side wall formed by the circumferential surface of the cylinder.

[0042] That is, in the first state of the liquid limiting device 4, when the liquid limiting device 4 is shielded between the partial side wall of the accommodating cavity 11 and the battery module 2, the liquid limiting device 4 can be surrounded with the bottom wall and other unshielded side walls of the accommodating cavity 11 to form a liquid injection space in which the battery module 2 is enclosed, which is the above-mentioned liquid injection space formed between the liquid limiting device 4 and the partial inner wall of the accommodating cavity 11, which can be referred to the seventh embodiment described below; when the liquid limiting device 4 is shielded between all side walls of the accommodating cavity 11 and the battery module 2, the liquid limiting device 4 is circumferentially surrounded around the battery module 2, and the liquid limiting device 4 is surrounded with the bottom wall of the accommodating cavity 11 to form a liquid injection space in which the battery module 2 is enclosed, which is the above-mentioned liquid injection space formed between the liquid limiting device 4 and the partial inner wall of the accommodating cavity 11, which can be referred to the fifth embodiment and the sixth embodiment described below, and when the liquid limiting device 4 additionally has the bottom portion 411 described below, the liquid limiting device 4 itself forms a liquid injection space in which the battery module 2 is enclosed, which can be referred to the first embodiment to the fourth embodiment described below.

[0043] Through the above technical solution, the battery shell provided by the present disclosure is provided with the liquid limiting device 4, when the battery module 2 accommodated in the battery shell occurs thermal runaway, the liquid limiting device 4 can be in the first state to be shielded between the battery module 2 and at least part of the side wall of the accommodating cavity 11, thereby being enclosed to form a liquid injection space in which the battery module 2 is surrounded, after the cooling liquid is injected into the liquid injection space, the liquid level of the cooling liquid can rapidly rise to immerse the battery module 2, compared with the battery shell without the liquid limiting device 4, the volume of the cooling liquid required to immerse the battery module 2 is smaller, the cooling cost is reduced, the liquid level rising speed is accelerated, the time required to immerse the battery module 2 is shortened, and the cooling efficiency is improved.

[0044] As a specific embodiment of the present disclosure, in the first state of the liquid limiting device 4, the liquid limiting device 4 is shielded between all side walls of the accommodating cavity 11 and the battery module 2. Referring to Figures 1 to 8 As shown in the figure, the accommodating cavity 11 can include oppositely arranged first and second cavity walls, and the liquid limiting device 4 can include a bag body 41, the bag body 41 can be sealingly connected with the first cavity wall, and an end of the bag body 41 facing the second cavity wall can be provided with an opening for avoiding the battery module 2, and the bag body 41 can be telescoped between the first and second cavity walls to be arranged on the outside of the battery module 2. Specifically, the liquid limiting device 4 can be configured such that: in the second state, the bag body 41 can be retracted and accommodated on the first cavity wall, so that the electrical gap between the battery module 2 and the inner wall of the accommodating cavity 11 is sufficient to ensure the working reliability of the battery module 2 without affecting the normal operation of the battery module 2; in the first state, the bag body 41 can be expanded towards the second cavity wall to form a liquid injection space with the first cavity wall.

[0045] In the detailed description of the present disclosure, one of the first cavity wall and the second cavity wall is the bottom wall of the containing cavity 11, and the other is the top wall of the containing cavity 11. In order to facilitate the arrangement of the water tank 34 in the battery case, the bottom wall of the containing cavity 11 can be a bottom platform 10 supported above the water tank 34.

[0046] Referring to Figures 1 to 6 As shown, when the first cavity wall is the bottom wall of the containing cavity 11 and the second cavity wall is the top wall of the containing cavity 11, the bag 41 is arranged on the bottom platform 10 and can be stretched upward in the vertical direction in the first state, and the maximum stretching height of the bag 41 in the vertical direction is equal to or greater than the height of the battery module 2, so that the height of the liquid injection space is equal to or greater than the height of the battery module 2, thereby ensuring that the cooling liquid in the liquid injection space can immerse the battery module 2.

[0047] Referring to Figures 1 to 6 As shown, the bag 41 can include a bottom portion 411 placed on the bottom platform 10 and a wall portion 412 sealingly connected with the bottom portion 411 to realize the relative sealing between the bag 41 and the bottom platform 10, and the wall portion 412 can be configured as a multi-pleated bellows structure to be stretched upward in the vertical direction to cover the outside of the battery module 2, at which time the bag 41 itself surrounds the liquid injection space. In addition, the bag 41 can also only include the above-mentioned wall portion 412, and the bottom end of the wall portion 412 can be sealingly connected with the bottom platform 10 to realize the relative sealing between the bag 41 and the bottom platform 10, at which time the bag 41 and the bottom wall of the containing cavity 11 surround the liquid injection space.

[0048] The following describes an embodiment in which the bag 41 is accommodated in the bottom wall of the containing cavity 11 in the second state and is stretched upward in the vertical direction in the first state.

[0049] First embodiment

[0050] Referring to Figures 1 to 3 As shown, in order to realize the upward stretching of the bag 41 in the vertical direction, the wall portion 412 of the bag 41 can be inflated or filled with liquid to realize the stretching in the vertical direction. Specifically, the wall portion 412 of the bag 41 can be provided with a flow channel for injecting gas or liquid, and by injecting gas or liquid into the flow channel, the wall portion 412 can be stretched in the vertical direction.

[0051] In order to reduce the expansion of the wall portion 412 in the horizontal direction, referring to Figure 3 As shown, a plurality of horizontally extending transverse reinforcing rings 413 can be arranged on the outer circumferential surface of the bag 41, and the plurality of transverse reinforcing rings 413 can be arranged in the vertical direction to reduce the deformation of the wall portion 412 in the horizontal direction when the gas or liquid is injected into the flow channel, so that the injected gas or liquid quickly drives the wall portion 412 to stretch in the vertical direction.

[0052] Second embodiment

[0053] Reference is made to Figure 4 As shown, in order to realize the upward stretching of the bag body 41 along the vertical direction, the top end of the bag body 41 can be provided with a pull line 414, and the second cavity wall can be provided with a driving member (not shown), which can drive the wall portion 412 to stretch and retract along the vertical direction through the pull line 414.

[0054] In addition, the stretching and retraction of the bag body 41 can also be realized by providing a magnet on the outer circumferential surface of the bag body 41. Specifically, reference is made to Figures 5 to 7 As shown, a plurality of fourth magnets 43 can be provided on the outer circumferential surface of the bag body 41, and the two magnetic poles of the fourth magnets 43 can be arranged along the stretching direction of the bag body 41. In the first state, the plurality of fourth magnets 43 can be arranged from one end of the bag body 41 to the other end of the bag body 41 along the stretching direction of the bag body 41, and at least part of the plurality of fourth magnets 43 can be an electromagnet. The liquid limiting device 4 can be configured to: in the first state, energize the electromagnet so that the magnetic pole arrangement of the electromagnet is opposite to the magnetic pole arrangement of the adjacent fourth magnet 43. That is, in the first state, the electromagnet and the adjacent fourth magnet 43 generate a repulsive force along the stretching direction of the bag body 41, so that the bag body 41 can be stretched.

[0055] In order to avoid the bag body 41 deviating from the predetermined stretching direction during the stretching process, a sliding block (not shown) can be provided on the outer circumferential surface of the bag body 41, and a sliding rail (not shown) extending along the stretching direction of the bag body 41 can also be provided in the accommodating cavity 11, and the sliding block can be slidably arranged on the sliding rail.

[0056] The following describes an embodiment in which the bag body 41 is accommodated in the bottom wall of the accommodating cavity 11 in the second state, and is stretched upward along the vertical direction by energizing the electromagnet in the first state.

[0057] Third embodiment

[0058] Reference is made to Figure 5 As shown, in order to realize the upward stretching of the bag body 41 along the vertical direction, a plurality of fourth magnets 43 can be provided on the wall portion 412, and the plurality of fourth magnets 43 can all be electromagnets.

[0059] In the first state, the plurality of electromagnets are energized so that the magnetic poles of the electromagnets are arranged along the vertical direction, and the magnetic pole arrangements of the adjacent two electromagnets are opposite, so that the adjacent two electromagnets repel each other, and further drive the wall portion 412 to stretch upward along the vertical direction. In addition, the plurality of electromagnets can be arranged from the top end of the wall portion 412 to the bottom end of the wall portion 412 in the stretched state of the wall portion 412, so as to ensure that after the plurality of electromagnets are energized, the wall portion 412 can be completely stretched under the repulsion of the adjacent two electromagnets.

[0060] Fourth embodiment

[0061] refer to Figure 6 As shown, in order to enable the bag body 41 to extend upward in the vertical direction, a plurality of fourth magnets 43 can be provided on the wall portion 412, a portion of the plurality of fourth magnets 43 can be electromagnets, and another portion of the plurality of fourth magnets 43 can be permanent magnets, the magnetic poles of the permanent magnets are arranged in the same manner, and an electromagnet is provided between two adjacent permanent magnets.

[0062] In the first state, the multiple electromagnets are energized, causing their magnetic poles to be arranged vertically, with each electromagnet having a magnetic pole arrangement opposite to that of an adjacent fourth magnet 43. This causes each electromagnet to repel the adjacent fourth magnet 43, thereby driving the wall portion 412 to extend vertically upward. Furthermore, when the wall portion 412 is extended, the multiple fourth magnets 43 can be arranged in a spaced-apart pattern from the top end of the wall portion 412 to the bottom end of the wall portion 412. This ensures that after the electromagnets are energized, the wall portion 412 can fully extend due to the mutual repulsion between two adjacent fourth magnets 43.

[0063] refer to Figure 7 and Figure 8 As shown, when the first cavity wall is the top wall of the accommodating cavity 11 and the second cavity wall is the bottom wall of the accommodating cavity 11, the bag body 41 can extend in the vertical direction to be sealed with the bottom wall of the accommodating cavity 11. The bag body 41 can include a wall portion 412, which can be configured as a multi-pleated bellows structure. The top end of the wall portion 412 can be fixedly connected to the top wall of the accommodating cavity 11, and the bottom end of the wall portion 412 can extend downward in the vertical direction to be sealed with the bottom wall of the accommodating cavity 11. At this time, the bag body 41 and the bottom wall of the accommodating cavity 11 surround and form a liquid injection space enclosing the battery module 2. The height of the liquid injection space is equal to the distance between the top wall and the bottom wall of the accommodating cavity 11.

[0064] The following describes an embodiment in which the bag body 41 is accommodated on the top wall of the accommodating cavity 11 in the second state and extends downward in the vertical direction in the first state.

[0065] Fifth embodiment

[0066] In this embodiment, the bag body 41 is extended downward in the vertical direction in the first state by energizing the electromagnet.

[0067] Specifically, refer to Figure 7 As shown, a plurality of fourth magnets 43 may be provided on the wall portion 412, a portion of the plurality of fourth magnets 43 may be electromagnets, another portion of the plurality of fourth magnets 43 may be permanent magnets, the magnetic poles of the permanent magnets are arranged in the same manner, and an electromagnet is provided between two adjacent permanent magnets.

[0068] In order to enable the bag body 41 to be accommodated on the top wall of the accommodating cavity 11 in the second state, the fourth magnet 43 at the bottom end of the wall portion 412 can be a permanent magnet. In the second state of the bag body 41, i.e. when the electromagnet is not powered, the wall portion 412 can be adsorbed on the top wall of the accommodating cavity 11 by the permanent magnet arranged at the bottom end of the wall portion 412, so that the wall portion 412 can be accommodated on the top wall of the accommodating cavity 11. In addition, the iron core of the unpowered electromagnet can be attracted to the adjacent permanent magnet, so that the wall portion 412 is folded and accommodated on the top wall of the accommodating cavity 11.

[0069] In the first state, the plurality of electromagnets are powered, so that the magnetic poles of the electromagnets are arranged in the vertical direction, and each electromagnet is arranged opposite to the magnetic pole arrangement of the adjacent fourth magnet 43, so that each electromagnet repels the adjacent fourth magnet 43, and in turn drives the wall portion 412 to extend downward in the vertical direction. In addition, the plurality of fourth magnets 43 can be arranged at intervals from the top end of the wall portion 412 to the bottom end of the wall portion 412 in the extended state of the wall portion 412, so as to ensure that the wall portion 412 can be fully extended under the repulsive action of the adjacent two fourth magnets 43 after the electromagnets are powered.

[0070] Sixth embodiment

[0071] This embodiment is a simplification of the fifth embodiment.

[0072] In order to enable the bag body 41 to be accommodated on the top wall of the accommodating cavity 11 in the second state, it is referred to Figure 8 As shown in FIG. 6, the top wall of the accommodating cavity 11 can be provided with a second magnet 42, and the bottom end of the wall portion 412 can be provided with a first magnet 45, and the two magnetic poles of the first magnet 45 are arranged in the vertical direction. In the second state of the bag body 41, the second magnet 42 is attracted to the first magnet 45, so that the bag body 41 can be accommodated on the top wall of the accommodating cavity 11. In the first state of the bag body 41, the second magnet 42 repels the first magnet 45, so that the wall portion 412 can be vertically extended downward under the repulsive force between the second magnet 42 and the first magnet 45 and the gravity of the first magnet 45.

[0073] In order to strengthen the sealing connection between the wall portion 412 and the bottom platform 10, a plurality of first magnets 45 can be arranged at the bottom end of the wall portion 412 in the circumferential direction, and a plurality of third magnets 44 can be correspondingly arranged on the bottom platform 10. In the first state of the bag body 41, the third magnet 44 is attracted to the first magnet 45, and the wall portion 412 can also be extended downward under the mutual attraction between the third magnet 44 and the first magnet 45, until the third magnet 44 and the first magnet 45 are attracted together.

[0074] In this embodiment, the second magnet 42 and the third magnet 44 can each be an electromagnet, and the magnetic pole arrangement of the second magnet 42 and the third magnet 44 can be changed by changing the direction of the current.

[0075] As another specific embodiment of the present disclosure, in the first state of the liquid limiting device 4, the liquid limiting device 4 is arranged between at least part of the side wall of the accommodating cavity 11 and the battery module 2.

[0076] Seventh embodiment

[0077] Reference is made to Figure 9 and Figure 10 As shown, the liquid limiting device 4 can include an inflatable structure 40, which can be an air bag or a water bag in specific embodiments of the present disclosure. The inflatable structure 40 can be attached to at least one side wall of the accommodating cavity 11, and when the inflatable structure 40 is inflated, it can occupy a part of the space in the accommodating cavity 11, thereby reducing the volume of the cooling liquid that can be accommodated in the accommodating cavity 11. The liquid limiting device 4 can be configured such that, in the second state, the inflatable structure 40 is in an un-inflated state and tightly adheres to the side wall of the accommodating cavity 11; and in the first state, the inflatable structure 40 can be inflated towards the battery module 2 to form a liquid injection space with the inner wall of the accommodating cavity 11.

[0078] When the inflatable structure 40 is attached to all the side walls of the accommodating cavity 11, in the first state, the inflatable structure 40 forms a liquid injection space with the bottom wall of the accommodating cavity 11.

[0079] When the inflatable structure 40 is attached to part of the side walls of the accommodating cavity 11, in the first state, the inflatable structure 40 forms a liquid injection space with the bottom wall of the accommodating cavity 11 and the side walls to which the inflatable structure 40 is not attached.

[0080] In order to reduce the inflation of the inflatable structure 40 in the horizontal direction, the inflatable structure 40 can be provided with a transverse limiting belt and / or a longitudinal limiting belt.

[0081] On the basis of the above technical solutions, the present disclosure further provides a power storage system, as shown in Figure 11 The power storage system can include the battery shell, the battery module 2, and the thermal management module 3 in the above technical solutions. The battery module 2 can be accommodated in the accommodating cavity 11, and the thermal management module 3 can include a liquid inlet pipeline 31 and a liquid outlet pipeline 32 in fluid communication with the accommodating cavity 11. Specifically, the liquid inlet pipeline 31 can be in fluid communication with the liquid inlet of the accommodating cavity 11 to inject cooling liquid into the accommodating cavity 11, and the liquid outlet pipeline 32 can be in fluid communication with the liquid outlet of the accommodating cavity 11 to discharge the cooling liquid in the accommodating cavity 11.

[0082] Through the technical solution, the energy storage system has the same technical effect as the battery shell in the technical solution, and details are not repeated here to avoid unnecessary repetition.

[0083] In the specific embodiments of the present disclosure, referring to Figure 11 As shown in the figure, the battery module 2 can include a plurality of batteries 20 arranged in a vertical direction, and a cooling liquid flow channel for flowing cooling liquid can be arranged between adjacent two batteries 20. When the cooling liquid immerses the battery module 2, the cooling liquid can also flow into the space between the adjacent two batteries 20 through the cooling liquid flow channel, thereby increasing the contact area of the battery module 2 with the cooling liquid, and further improving the cooling effect of the cooling liquid. Specifically, an elastic gasket (not shown) can be arranged between the adjacent two batteries 20, and through the elastic gasket, a gap can be formed between the adjacent two batteries 20, which can be used as the cooling liquid flow channel.

[0084] In the specific embodiments of the present disclosure, referring to Figure 11 As shown in the figure, the thermal management module 3 can further include a heat exchange pipe 33, a water tank 34, and a circulating power device 35. The heat exchange pipe 33 can be arranged in the containing cavity 11 and fixedly connected to the top wall of the containing cavity 11. The heat exchange pipe 33 can be in fluid communication between the liquid inlet pipeline 31 and the containing cavity 11. The circulating power device 35 is used for pumping the cooling liquid in the liquid inlet pipeline 31 to the heat exchange pipe 33. The water tank 34 can be arranged at the bottom of the containing cavity 11, and the liquid outlet pipeline 32 can be in fluid communication with the water tank 34. In the containing cavity 11, the following process occurs: the cooling liquid entering the containing cavity 11 will evaporate and rise after contacting the high-temperature battery module 2. The cooling liquid will condense when it encounters the heat exchange pipe 33 with a lower temperature during the rising process. The cooling liquid condensed on the surface of the heat exchange pipe 33 will drip down and accumulate in the water tank 34, and finally be discharged through the liquid outlet pipeline 32.

[0085] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept range of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection range of the present disclosure.

[0086] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not make further descriptions on various possible combinations.

[0087] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A battery housing, characterized in that: include: The housing comprises a housing cavity adapted to accommodate the battery module; as well as A liquid limiting device is provided in the accommodating cavity. In a first state, the liquid limiting device is provided between the battery module and at least a portion of the side wall of the accommodating cavity. A liquid injection space can be formed between the liquid limiting device and a portion of the inner wall of the accommodating cavity or the liquid limiting device itself. The liquid injection space encloses the battery module therein and is used to inject coolant. The accommodating cavity includes a first cavity wall and a second cavity wall arranged opposite to each other, the liquid limiting device includes a bag body, the bag body is sealed with the first cavity wall, an end of the bag body facing the second cavity wall is provided with an opening for avoiding the battery module, and the bag body is suitable for expanding and contracting between the first cavity wall and the second cavity wall. In the second state, the bag body is shrunk and stored on the first cavity wall; In the first state, the bag body extends toward the second cavity wall to form the liquid injection space; The first cavity wall is the bottom wall of the accommodating cavity, the second cavity wall is the top wall of the accommodating cavity, a pull line is provided on the top of the bag body, and a driving member is provided on the second cavity wall. The driving member can drive the bag body to expand and contract in the vertical direction through the pull line, or, The first cavity wall is the top wall of the accommodating cavity, the second cavity wall is the bottom wall of the accommodating cavity, and the bag body can extend in a vertical direction to be sealed and connected with the second cavity wall.

2. The battery case according to claim 1, wherein: The first cavity wall is the bottom wall of the accommodating cavity, the second cavity wall is the top wall of the accommodating cavity, and the maximum extended height of the bag body in the vertical direction is equal to or greater than the height of the battery module.

3. The battery case according to claim 1 or 2, characterized in that: The bag body is provided with a flow channel for injecting gas or liquid.

4. The battery case according to claim 3, characterized in that The outer peripheral surface of the bag body is provided with a plurality of transverse reinforcement rings extending along the circumferential direction, and the plurality of transverse reinforcement rings are arranged at intervals along the vertical direction.

5. The battery case according to claim 1, wherein: The first cavity wall is provided with a second magnet, the second cavity wall is provided with a third magnet, the bottom end of the bag body is provided with a first magnet, and the two magnetic poles of the first magnet are arranged in a vertical direction. In the second state, the second magnet and the first magnet are attracted to each other; in the first state, the second magnet and the first magnet are repelled to each other, and the third magnet and the first magnet are attracted to each other.

6. The battery case according to claim 1, wherein: A slider is provided on the outer peripheral surface of the bag body, and a slide rail extending along the extending direction of the bag body is further provided in the accommodating cavity, and the slider is slidably provided on the slide rail.

7. The battery case according to claim 1, characterized in that The liquid limiting device includes an expandable structure, and the expandable structure is provided on at least one side wall of the accommodating cavity. In the first state, the inflatable structure inflates toward the battery module; in the second state, the inflatable structure is in an uninflated state and closely adheres to the side wall of the accommodating cavity.

8. The battery case according to claim 7, characterized in that The expandable structure is provided with a transverse limiting belt and / or a longitudinal limiting belt.

9. An energy storage system, characterized in that: include: The battery case according to any one of claims 1 to 8, A battery module is housed in the housing cavity, and The thermal management module includes a liquid inlet pipeline and a liquid outlet pipeline in fluid communication with the accommodating cavity.

10. The energy storage system according to claim 9, characterized in that: The battery module includes a plurality of batteries arranged in a stack, and a coolant flow channel for allowing coolant to flow is provided between two adjacent batteries.

11. The energy storage system according to claim 9, characterized in that: The thermal management module further includes: The heat exchange tube is arranged in the accommodating cavity and fixedly connected to the top wall of the accommodating cavity. The heat exchange tube is connected between the liquid inlet pipeline and the accommodating cavity. A water tank is provided at the bottom of the accommodating cavity, and is used to collect the coolant condensed on the surface of the heat exchange tube. The liquid outlet pipeline is in fluid communication with the water tank, and A circulation power device is used to pump the coolant in the liquid inlet pipeline to the heat exchange tube.

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